CN113261379A

CN113261379A - Data transmission method and device

Info

Publication number: CN113261379A
Application number: CN201980087990.8A
Authority: CN
Inventors: 任占阳; 贾树葱
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-10
Filing date: 2019-01-10
Publication date: 2021-08-13
Anticipated expiration: 2039-01-10
Also published as: CN113261379B; WO2020143001A1

Abstract

The embodiment of the application provides a method and a device for data transmission, wherein the method comprises the following steps: the method comprises the steps that terminal equipment receives indication information sent by network equipment on one or more subbands in a first subband set, wherein the indication information comprises subband resource indication information, the subband resource indication information is used for indicating that the network equipment successfully performs Listen Before Talk (LBT) on a second subband set, and the second subband set comprises one or more subbands except for each subband in the first subband set in subbands in the subbands successfully performed by the network equipment; and the terminal equipment performs LBT on one or more subbands in the second subband set and transmits data to the network equipment on one or more subbands successful in LBT. By adopting the embodiment of the application, the opportunity that the terminal equipment obtains the channel use right can be increased, and the efficiency of accessing the channel by the terminal equipment is improved, so that the utilization rate of channel resources can be improved, and the applicability is stronger.

Description

Data transmission method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for data transmission.

Background

MulteFire is one of wireless communication technologies in the field of wireless communication, and applies Long Term Evolution (LTE) technology to unlicensed spectrum (unlicensed spectrum) to provide high-performance communication services similar to LTE. The unlicensed spectrum is a spectrum with shared properties, when a device in the unlicensed spectrum needs to transmit data, a Listen Before Talk (LBT) operation is required before accessing a channel to detect whether another device in the channel is transmitting data, and if it is detected that the channel has no other device in the channel transmitting data, the device accesses the channel and can transmit data on the channel. A device without a licensed spectrum cannot always occupy a channel after accessing the channel, but has a Maximum Channel Occupancy Time (MCOT). When a device (e.g., device 1) in unlicensed spectrum wants to transmit data to another device (e.g., device 2) in unlicensed spectrum, device 1 performs an LBT post-access channel including a random back-off procedure and a Contention Window (CW) with a variable length to obtain an MCOT and transmits data to device 2 in the MOCT. If the time length of the data sent by the device 2 to the device 1 is less than the time length of the remaining portion of the MCOT, the device 2 performs LBT with fixed duration and without a random backoff procedure, and after the LBT succeeds, the device 1 may send the data to the device 2. Or, if the time length of the device 2 sending data to the device 1 is less than the remaining time length of the MCOT, and the time interval between the starting time of the device 2 sending data to the device 1 and the ending time of the device 1 sending data to the device 2 is less than a certain threshold, the device 2 can directly send data to the device 1 without performing LBT. A multi-subband system refers to a communication device having an operating bandwidth divided into a plurality of continuous subbands or a plurality of discontinuous subbands, and the communication device may communicate with the corresponding communication device using one or more subbands. Unlicensed spectrum has a large amount of bandwidth, and the MulteFire technology can also aggregate adjacent or non-adjacent spectrum for data transmission when allowed by a device.

In a multi-subband system, in order to better transmit data between devices in an unlicensed spectrum, how to increase the LBT efficiency in the process of accessing the devices in the unlicensed spectrum to a channel on the premise of ensuring fairness becomes one of the currently urgent technical problems to be solved. In the prior art, when a device 1 without a licensed spectrum needs to transmit data to a device 2, the device 1 performs LBT on multiple subbands simultaneously, and LBT of at least one subband needs to include a random backoff procedure, after LBT of any one or multiple subbands succeeds and LBT of at least one subband having performed LBT including the random backoff procedure succeeds, the device 1 obtains MCOT on the subband having succeeded in LBT and can select to transmit data by using all or part of the subband having succeeded in LBT. However, in the prior art, after the device 1 succeeds in LBT on any one or more subbands and acquires the MCOT corresponding to each subband, the device 1 can only share the remaining part of the MCOT corresponding to the subband for transmitting data to the device 2. Since the fixed duration LBT procedure without a random back-off procedure is typically shorter in duration than the random back-off procedure, the fixed duration LBT procedure without a random back-off procedure is more efficient. However, the device 2 can only send data with a duration not exceeding the MCOT remaining time to the device 1 after the subband receiving the data performs LBT without including the random back-off procedure and LBT succeeds, or the device 2 can only directly send data with a duration not exceeding the MCOT remaining time to the device 1 without performing LBT when the subband receiving the data satisfies that a time interval between a start time when the device 2 sends data to the device 1 and an end time when the device 1 sends data to the device 2 is smaller than a certain threshold value. If the device 2 is ready to send data to the device 1 on the subband where the data of the device 1 is not received, only the less efficient LBT including the random back-off procedure can be performed, and the utilization rate of subband resources is low.

Disclosure of Invention

The embodiment of the application provides a method and a device for data transmission, which can increase the opportunity that terminal equipment obtains channel use right and improve the efficiency of LBT of the terminal equipment, thereby improving the effective utilization rate of sub-band resources and having higher applicability.

In a first aspect, an embodiment of the present application provides a data transmission method, where the method is applied to a terminal device side, and the method includes: the terminal device receives indication information sent by a network device on one or more subbands in a first subband set, where the indication information includes subband resource indication information, the subband resource indication information is used to indicate that the network device successfully performs Listen Before Talk (LBT) on a second subband set, and the second subband set includes one or more subbands, excluding all subbands included in the first subband set, in subbands successfully performing LBT on the network device. The indication information may be Downlink Control Information (DCI) or may be other information besides DCI. The terminal device performs LBT on all or some subbands in the first subband set (i.e., one or more subbands in the first subband set), and sends data to the network device on a subband on which LBT is successful. Or, the terminal device performs LBT on all or some subbands in the second subband set (i.e., one or more subbands in the second subband set), and sends data to the network device on a subband on which LBT succeeds. Or, the terminal device performs LBT on all or some subbands in the first subband set and the second subband set (i.e., one or more subbands in a union of the first subband set and the second subband set), and transmits data to the network device on a subband on which LBT succeeds. In this embodiment, the terminal device may determine, based on the subband resource indication information carried in the indication information, other usable subbands except for the subband in which the network device transmits the downlink data, where the usable subbands are subbands in which the network device LBT succeeds but does not transmit the downlink data. The terminal equipment can carry out LBT on each available sub-band, so that the LBT efficiency can be increased, the effective utilization rate of each sub-band resource is improved, the data transmission efficiency is improved, and the applicability is stronger.

With reference to the first aspect, in a first possible implementation manner, the subband resource indicator is used to indicate subband identification information of each subband in the second subband set; the performing, by the terminal device, LBT on all or part of subbands in the first subband set, and sending data to the network device on one or more subbands in which LBT is successful includes: the terminal device performs LBT with a fixed time length without including a random back-off procedure on all or some of the subbands in the first subband set, and transmits data to the network device on one or more subbands in which LBT with the fixed time length is successful. The performing, by the terminal device, LBT on all or part of subbands in the second subband set, and sending data to the network device on one or more subbands in which LBT is successful includes: the terminal device determines one or more subbands in the second subband set according to the subband identification information of the second subband set, performs LBT with a fixed time length without including a random back-off process on all or some subbands in the second subband set, and sends data to the network device on one or more subbands in which LBT with the fixed time length is successful. The performing, by the terminal device, LBT on all or some subbands in the first subband set and the second subband set, and sending data to the network device on one or more subbands in which LBT is successful includes: the terminal device performs LBT with a fixed time length without including a random back-off procedure on all or some subbands in the first subband set and the second subband set, and transmits data to the network device on one or more subbands on which LBT with the fixed time length is successful. Optionally, a duration of the LBT that is performed by the terminal device on the subbands in the second subband set and does not include the fixed time length of the random backoff process is greater than or equal to a duration of the LBT that is performed by the terminal device on the subbands in the first subband set and does not include the fixed time length of the random backoff process. Optionally, a duration of an LBT that does not include a fixed time length of the random backoff process and is performed on a subband in the second subband set is smaller than a duration of an LBT that has the random backoff process and a contention window length that is not fixed. In the embodiment of the present application, the terminal device may perform LBT for a fixed time length on a subband where the network device LBT succeeds but downlink data is not transmitted, so that the efficiency of LBT may be increased.

With reference to the first aspect, in a first possible implementation manner, the subband resource indicator is used to indicate a maximum channel occupation time MCOT of each subband in the second subband set; and the terminal device LBT succeeds on one or more subbands included in the second subband set and transmits data to the network device, wherein the time length for transmitting data to the network device is not greater than the MCOT of the subband with successful LBT.

With reference to the first aspect, in a first possible implementation manner, the subband resource indication information is further configured to indicate a total MCOT time length of each subband in the first subband set and a downlink time length occupied by the network device for sending data to the terminal device in the total MCOT time length of each subband.

With reference to the first aspect, in a first possible implementation manner, the subband resource indication information is further configured to indicate a remaining time length, which is obtained by dividing a total MCOT time length of each subband in the first subband set by a downlink time length occupied by the network device for sending data to the terminal device in the total MCOT time length of each subband.

With reference to the first aspect, in a first possible implementation manner, the subband resource indication information is further used to indicate a parameter or a channel access priority class (channel access priority class) of an LBT that includes a random backoff process and is used by the network device to indicate a total MCOT time length of each subband in the first subband set and/or the second subband set. That is, the subband resource indication information implicitly indicates the total MCOT time length of each subband in the first subband set by indicating a parameter of LBT including a random backoff procedure specifically adopted by the network device or a channel access priority type. Optionally, the subband resource indication information implicitly indicates the total MCOT time length of each subband in the second subband set by indicating a parameter of LBT including a random backoff process specifically adopted by the network device or a channel access priority type. Optionally, the total time lengths of the MCOT of the subbands in the first subband set may be the same or different. Optionally, the total time lengths of the MCOT of the subbands in the second subband set may be the same or different. Optionally, the total time lengths of the MCOT of each subband in the first subband set and each subband in the second subband set may be the same or different. Optionally, the downlink time length may be the same or different for each subband in the first subband set. In this embodiment, the terminal device may further perform LBT without a random backoff procedure on all or some of the subbands in the first subband set. When LBT is successfully performed on all or some of the subbands in the first subband set, the terminal device sends data to the network device on all or some of the subbands in the first subband set where LBT is successfully performed. Optionally, the time length for the terminal device to send data to the network device in the sub-band in the first sub-band set where LBT succeeds is not longer than the remaining time length except the downlink time length of the sub-band in the first sub-band set where LBT succeeds in the total time length of MCOT of the sub-band in the first sub-band set where LBT succeeds. In this embodiment, the terminal device may further perform LBT without including a random backoff procedure on all or some subbands in the second subband set. When LBT is successfully performed on all or some of the subbands in the second subband set, the terminal device sends data to the network device on all or some of the subbands in the second subband set where LBT is successfully performed. Optionally, the time length for the terminal device to send data to the network device in the subband in the second subband set where LBT succeeds is not greater than the total time length of MCOT of the subband in the second subband set where LBT succeeds. Optionally, the time length for the terminal device to send data to the network device on the subband in the second subband set where LBT succeeds is not greater than the time length of MCOT of the subband in the second subband set where LBT succeeds minus the downlink time length of a certain subband in the first subband set. Therefore, the path for transmitting data to the network equipment by the terminal equipment is increased, the data transmission rate is improved, and the applicability is stronger.

In a second aspect, an embodiment of the present application provides a method for data transmission, where the method is applied to a network device side, and the method includes: the network device listens before talks LBT on a plurality of sub-bands, and sends indication information to the terminal device on all or part of sub-bands in a first sub-band set, wherein the first sub-band set comprises one or more sub-bands of the plurality of sub-bands, the indication information comprises sub-band resource indication information, the sub-band resource indication information is used for indicating a second sub-band set of which the LBT is successful, and the second sub-band set comprises one or more sub-bands except all sub-bands in the first sub-band set in the sub-bands of which the LBT is successful. The indication information may be DCI, or may be information other than DCI. And the network equipment receives the data sent by the terminal equipment in one or more subbands in the first subband set. Or, the network device receives data sent by the terminal device in one or more subbands in the second subband set. Or, the network device receives data sent by the terminal device in one or more subbands in the first subband set and the second subband set. In this embodiment of the present application, the network device may issue, to the terminal device, the subband resource indication information of one or more subbands in which LBT is successful but data is not sent, through the indication information, and notify the terminal device that LBT can be performed on the subband in which data is not sent through the subband resource indication information, so that the LBT efficiency of the terminal device may be improved, the chance that the terminal device obtains the channel usage right is increased, and the data transmission rate between the terminal device and the network device is improved.

With reference to the second aspect, in a first possible implementation manner, the subband resource indicator is used to indicate subband identification information of each subband in the second subband set, and a maximum channel occupation time MCOT of each subband in the second subband set. That is, the subband resource indicator indicates the total MCOT time length of each subband in the second subband set.

With reference to the second aspect, in a first possible implementation manner, the subband resource indication information is further configured to indicate a total MCOT time length of each subband in the first subband set and a downlink time length occupied by the network device for sending data to the terminal device in the total MCOT time length.

With reference to the second aspect, in a first possible implementation manner, the subband resource indication information is further configured to indicate a remaining time length, which is obtained by dividing a total MCOT time length of each subband in the first subband set by a downlink time length occupied by the network device for sending data to the terminal device in the total MCOT time length of each subband.

In a third aspect, the present application provides a terminal device, where the terminal device includes a unit and/or a module for performing the method for data transmission provided in the first aspect and/or any one of the possible implementations of the first aspect, so that beneficial effects (or advantages) of the method for data transmission provided in the first aspect and/or any one of the possible implementations of the first aspect can also be achieved.

In a fourth aspect, the present application provides a network device, which includes a unit and/or a module for performing the method for data transmission provided in any one of the foregoing second aspects and/or any one of the foregoing second possible implementations, so that the beneficial effects (or advantages) of the method for data transmission provided in any one of the second aspects and/or any one of the second possible implementations can also be achieved.

In a fifth aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a memory, a transceiver, and a processor; wherein the memory, transceiver and processor are connected by a communication bus. The memory is configured to store a set of program codes, and the transceiver and the processor are configured to call the program codes stored in the memory to perform the method for data transmission provided by the first aspect and/or any one of the possible implementations of the first aspect, so as to achieve the beneficial effects of the method for data transmission provided by the first aspect and/or any one of the possible implementations of the first aspect.

In a sixth aspect, an embodiment of the present application provides a network device, which includes a memory, a transceiver, and a processor; wherein the memory, transceiver and processor are connected by a communication bus. The memory is configured to store a set of program codes, and the transceiver and the processor are configured to call the program codes stored in the memory to perform the method for data transmission provided by any one of the above-mentioned second aspect and/or any one of the above-mentioned possible implementations of the first aspect, so as to achieve the beneficial effects of the method for data transmission provided by any one of the above-mentioned second aspect and/or any one of the above-mentioned possible implementations of the first aspect.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores instructions, and when the instructions are executed on a terminal device, the terminal device is enabled to perform the method for data transmission provided by the first aspect and/or any one of the possible implementations of the first aspect, so that the beneficial effects of the method for data transmission provided by the first aspect and/or any one of the possible implementations of the first aspect can also be achieved.

In an eighth aspect, the present invention provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a network device, the network device is enabled to perform the method for data transmission provided in any one of the second aspect and/or the first aspect, so that the beneficial effects of the method for data transmission provided in any one of the second aspect and/or the first aspect can also be achieved.

In a ninth aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus may be a chip or multiple cooperating chips, and the communication apparatus includes an input device coupled to the communication apparatus (e.g., a chip), for executing the technical solution provided by the first aspect of the embodiment of the present application and/or any one of the possible implementations of the first aspect. It should be understood that "coupled" herein means that two components are directly or indirectly joined to each other. The combination may be fixed or movable, which may allow flowing fluid, electrical or other types of signals to be communicated between the two components.

In a tenth aspect, an embodiment of the present application provides a communication apparatus, which may be a chip or multiple cooperating chips, and includes an input device coupled to the communication apparatus (e.g., a chip) for implementing a technical solution provided by any one of the possible implementations of the second aspect and/or the second aspect of the embodiment of the present application. It should be understood that "coupled" herein means that two components are directly or indirectly joined to each other. The combination may be fixed or movable, which may allow flowing fluid, electrical or other types of signals to be communicated between the two components.

In an eleventh aspect, embodiments of the present application provide a communication system, which includes a transceiver and a processor, and the transceiver and the processor are configured to be coupled with a memory, and a terminal device that reads and executes instructions in the memory to support data transmission implements the functions related to the first aspect. In one possible design, the communication system further includes a memory for storing program instructions and data necessary for the terminal device for channel access. The communication system may be constituted by a chip, or may comprise a chip and other discrete devices.

In a twelfth aspect, embodiments of the present application provide a communication system, which includes a transceiver processor, configured to couple with a memory, and to read and execute instructions in the memory for a network device supporting data transmission, to implement the functions recited in the second aspect. In one possible design, the communication system further includes a memory for storing program instructions and data necessary for the network device to access the channel. The communication system may be constituted by a chip, or may comprise a chip and other discrete devices.

In a thirteenth aspect, an embodiment of the present application provides a computer program product containing instructions, which, when running on a terminal device, enables the terminal device to execute the method for data transmission provided in the first aspect, and also can achieve the beneficial effects of the method for data transmission provided in the first aspect.

In a fourteenth aspect, the present application provides a computer program product containing instructions, which, when running on a network device, enables the network device to execute the method for data transmission provided in the second aspect, and also can achieve the beneficial effects of the method for data transmission provided in the second aspect.

Drawings

Fig. 1 is an infrastructure diagram of a communication system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a listen-before-talk principle provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a listen-before-talk process provided by an embodiment of the present application;

fig. 4 is a diagram of multiple subbands for carrier aggregation according to an embodiment of the present disclosure;

FIG. 5 is an interaction diagram of a method for data transmission according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a multi-subband LBT provided by an embodiment of the present application;

fig. 7 is another schematic diagram of a multi-subband LBT provided by an embodiment of the present application;

fig. 8 is another schematic diagram of a multi-subband LBT provided by an embodiment of the present application;

fig. 9 is another schematic diagram of a multi-subband LBT provided by an embodiment of the present application;

fig. 10 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

fig. 11 is a schematic structural diagram of a network device provided in an embodiment of the present application;

fig. 12 is another schematic structural diagram of a terminal device provided in an embodiment of the present application;

fig. 13 is another schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the present application.

The data transmission method provided in the embodiment of the present application may be applicable to a fifth generation wireless (5 generation, 5G, also called New Radio (NR)) system (or referred to as NR system), and may also be applicable to an LTE system, or other wireless communication systems using various radio access technologies, for example, systems using access technologies such as Code Division Multiple Access (CDMA), frequency division multiple access (frequency division multiple access, FDMA), time division multiple access (time division multiple access, TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), frequency division multiple access (SC-FDMA), and the like. Further, the embodiments of the present application may also be specifically applied to a Communication system in NB-IoT, an enhanced Machine Type Communication (eMTC) system, and the like. Fig. 1 is a schematic diagram of an infrastructure of a communication system according to an embodiment of the present application. The communication system provided in the embodiment of the present application includes, but is not limited to, a network device and a terminal device (e.g., terminal device 1 to terminal device 6), and is not limited herein. The network device and the terminal device shown in fig. 1 may be referred to as a communication apparatus or a communication device, each of the network device and the terminal device may be a chip or multiple chips working in cooperation, and the network device and/or the terminal device may further include an input device coupled to the network device and/or the terminal device, for executing the method for data transmission provided in the embodiment of the present application. The method may be determined according to an actual application scenario, and is not limited herein. The network device and the terminal device provided by the embodiment of the application can transmit data or signaling, including uplink transmission and downlink transmission. Here, it can be understood that the uplink transmission may be that the terminal device sends data or signaling to the network device, and the downlink transmission may be that the network device sends data or signaling to the terminal device.

The terminal devices to which the present application relates may be devices (devices) that provide voice and/or data connectivity to users, including wired terminals and wireless terminals. A wireless terminal may be a handheld device having wireless connection capabilities or other processing device connected to a wireless modem and a mobile terminal that communicates with one or more core networks via a Radio Access Network (RAN). For example, the wireless terminal may be a mobile phone, a computer, a tablet computer, a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a wearable device, an electronic book reader (e-book reader), and the like. As another example, the wireless terminal may be a gas station, a printer, an electric meter, a watch, a water dispenser, and the like. As another example, a wireless terminal may be a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device. For another example, the wireless terminal may be a mobile station (mobile station), an access point (access point), or the like. The specific expression of the wireless terminal may be determined according to an actual application scenario of the NB-IOT, which is not limited herein. A User Equipment (UE) is a kind of terminal equipment, and is called in an LTE system. For convenience of description, in the following description of the present application, the above-mentioned devices will be described by taking terminal devices as examples. The network device according to the embodiments of the present application is a communication apparatus deployed in a radio access network for providing a terminal device with a wireless communication function. The network device may include various types of macro base stations, micro base stations, relay stations, access point base station controllers, transmission reception nodes (TRPs), and the like. In systems using different radio access technologies, the specific names of network devices may be different, for example, in an LTE network, a network device (or a base station) is called an evolved node B (eNB), and in a subsequent evolved system, may also be called a new radio node B (gNB). For convenience of description, in the following description of the present application, the above-mentioned devices are collectively referred to as a network device.

The method for data transmission provided by the embodiment of the present application (for convenience of description, the method provided by the embodiment of the present application is hereinafter referred to simply) may be applied to a device of unlicensed spectrum in a MulteFire network, including a network device and a process in which a terminal device in the MulteFire network accesses a channel and transmits data on the channel. MulteFire is one of wireless communication technologies in the field of wireless communication, and applies LTE technology to unlicensed spectrum, providing high-performance communication services similar to LTE. Because the MulteFire is completely based on the unlicensed spectrum, large, medium and small enterprises, factories, ports, warehouses, venues, apartments and other places without the licensed spectrum can be deployed with the MulteFire-based network.

For convenience of understanding, the LBT, unlicensed spectrum, maximum channel occupation time, carrier aggregation technique, and sub-band involved in the method provided in the embodiment of the present application will be summarized as follows:

referring to fig. 2, fig. 2 is a schematic diagram of a principle of listening before speaking provided by an embodiment of the present application. As shown in fig. 2, LBT refers to a device (such as a terminal device and/or a network device in a MulteFire network, etc., which may be assumed to be a network device for convenience of description) that needs to transmit data, before sending data on a certain wireless carrier, the wireless environment of the wireless carrier needs to be detected to determine whether other devices are transmitting data. Assuming that the network device performs carrier detection at time t1, when it is detected that the energy on the wireless carrier is greater than or equal to the energy threshold, the network device may consider that there are other devices transmitting data at this time, and the network device will back off for a period of time before attempting to transmit data. Assuming that it is time t2, the network device performs carrier detection again, and when it is detected that the energy on the wireless carrier is less than the energy threshold, the network device may consider that the wireless carrier is in an idle state at this time, and the network device performs data transmission on the wireless carrier. In other words, the network device performs carrier detection at time t1, and when it is detected that the energy on the wireless carrier is greater than or equal to the energy threshold, the network device may consider that there are other devices transmitting data at this time, and LBT of the wireless carrier by the network device has not been successful yet. In other words, the network device performs carrier detection at time t2, and when it is detected that the energy on the wireless carrier is less than the energy threshold, the network device may consider that the wireless carrier is in an idle state at this time, and the network device performs LBT on the wireless carrier successfully at this time. LBT there are LBT in signal detection mode and other modes in addition to LBT in energy detection mode. The LBT device in the signal detection mode determines whether a channel is idle by detecting whether a pre-designed signal is present on a wireless carrier. The following description of the idle state of the wireless carrier may refer to the detection that the energy on the wireless carrier is less than the energy threshold, or may refer to the non-detection of a pre-designed signal on the wireless carrier, which is not limited herein. The following description of the wireless carrier not being in an idle state may refer to the detection of the energy on the wireless carrier being greater than or equal to an energy threshold, and may also refer to the detection of a pre-designed signal on the wireless carrier, which is not limited herein.

Random backoff means that once a device without a licensed spectrum detects through LBT that a certain channel is idle, i.e. no other device transmits data on the channel, there is an additional, randomly selected, waiting time. During this waiting time, the unlicensed spectrum device may select the channel if the channel is still idle, i.e., the unlicensed spectrum device may access the channel. Here, the unlicensed spectrum device may select the random waiting time by randomly selecting a backoff value N, which needs to be selected between 0 and a Contention Window Size (CWS), which needs to be selected between a specified CW minimum value and a CW maximum value. The CWS may be greater than or equal to the minimum value and less than or equal to the maximum value. Furthermore, during random backoff or data transmission, if the device finds channel collision once, it increases the contention window size, thereby increasing the probability of getting a larger value when the device randomly selects the backoff time again. If the device does not find channel collision during random backoff or data transmission, the size of the contention window is reduced, thereby reducing the probability of obtaining a larger value when the device randomly selects the backoff time again.

The unlicensed spectrum is a spectrum with shared properties, when a device of the unlicensed spectrum needs to perform data transmission on a certain carrier, before the device of the unlicensed spectrum accesses a channel, LBT needs to be performed on the access channel to detect whether other devices of the channel are transmitting data, and if it is detected that no other device of the channel is transmitting data, the device of the unlicensed spectrum accesses the channel. Here, the device access channel of the unlicensed spectrum means that the device of the unlicensed spectrum occupies the carrier within a certain time period to perform data transmission on the carrier. Since the unlicensed spectrum is a spectrum with shared properties, a channel access mechanism needs to be standardized, so that spectrum sharing and friendly coexistence among devices of the unlicensed spectrum are ensured.

In the study of 3rd generation partnership project (3 GPP) for licensed-assisted access (LAA), four types of LBT mechanisms are discussed, including:

type 1: there is no LBT, i.e., the device does not perform LBT before transmitting data. Namely Category 1: No LBT, hereinafter abbreviated Cat.1 LBT for convenience of description.

Type 2: LBT without random back-off procedure, i.e. LBT of fixed time length. Namely, Category 2, LBT with random back-off, for convenience of description, hereinafter referred to as Cat.2 LBT.

Type 3: LBT with random back-off procedure and fixed contention window length. Namely, Category 3LBT with random back-off with a content with fixed size, hereinafter referred to as Cat.3LBT for convenience of description.

Type 4: LBT with random back-off procedure and contention window length is not fixed. Namely, Category 4LBT with random back-off with a content window of variable size, for convenience of description, hereinafter referred to as Cat.4 LBT.

Referring to fig. 3, fig. 3 is a schematic process diagram of LBT provided in an embodiment of the present application. As shown in fig. 3, in cat.2lbt, a device without a licensed spectrum needs to perform a Clear Channel Assessment (CCA) on a certain channel for at least a fixed time before transmitting data on the channel, where the fixed time is equal to a preset sensing interval (sensing interval), such as 0.025 ms. Assuming that the continuous time length of the wireless carrier in the idle state is sensed to be not less than the sensing interval in a period of time immediately before the device of the unlicensed spectrum transmits data, it is determined that the idle channel assessment is passed, and at this time, the device of the unlicensed spectrum accesses the channel and performs data transmission on the channel. If the device of the unlicensed spectrum senses that the continuous time length of the wireless carrier in the idle state is smaller than the sensing interval in a period of time immediately before sending data, it is determined that the idle channel assessment does not pass, and at this time, the device does not access the channel, that is, does not perform data transmission on the channel. The wireless carrier being in an idle state may mean that energy on the wireless carrier is detected to be less than an energy threshold, or that a pre-designed signal on the wireless carrier is not detected. The immediately preceding period of time is a period of time from a time before the unlicensed spectrum device transmits data to a time when the unlicensed spectrum device starts transmitting data.

In cat.3LBT and cat.4LBT, a device without a licensed spectrum needs to perform idle channel estimation on a certain channel before transmitting data on the channel, where the idle channel estimation includes a delay duration (defer duration) stage and a random backoff (random backoff) stage. The unlicensed spectrum device needs to first sense that the wireless carrier is in a idle state within a delay duration, and then the unlicensed spectrum device needs to access the channel and transmit data on the channel only when detecting that the wireless carrier is in the idle state N times in channel detection in which the duration of each detection is equal to a clear channel assessment slot (CCA slot). More specifically, each time when a wireless carrier is detected to be in an idle state in the channel detection with the duration of CCA slot, a subtraction operation is performed on the value N, and when the value N is 0, the device accesses the channel and transmits data on the channel; when detecting that a wireless carrier is in a non-idle state in a certain detection with the duration of CCA slot, the device stores a current value of N, then continuously performs channel sensing on a channel, when the device detects that the duration of the wireless carrier in the idle state is greater than or equal to the delay duration, the device retrieves the stored value of N and continues to perform channel detection with the duration of CCA slot, detects that the wireless carrier is in the idle state, performs a subtraction operation on the value of N, detects that the wireless carrier is in the non-idle state, stores the current value of N, and when the device detects that the duration of the wireless carrier in the idle state is greater than or equal to the delay duration, retrieves the value of N and continues to perform channel detection with the duration of CCA slot, until the value of N is reduced to 0, at this time, the device accesses the channel and transmits data on the channel. The delay duration may be a preset time duration, for example, 0.034ms, and the clear channel assessment slot CCA slot may be a preset time duration, for example, 0.009ms, where the backoff value N randomly selected by the device in the unlicensed spectrum needs to be selected from 0 to the contention window size. Wherein the size of the contention window in the cat.3LBT is a fixed value, for example, the CWS in the cat.3LBT process shown in fig. 3 can be fixed to 15. The contention window size in cat.4LBT needs to be selected between a specified CW minimum value and a specified CW maximum value, i.e. the CWs of cat.4LBT may be greater than or equal to the above CW minimum value and less than or equal to the above CW maximum value, for example, in cat.4LBT shown in fig. 3, when LBT is performed in the first backoff countdown (backoff countdown), the CWs is 15, and when LBT is performed in the second backoff countdown, the CWs is 31. In addition, in cat.4LBT shown in fig. 3, 8 backoff values N are selected from 0 to CWS (15), when LBT is performed in the first backoff countdown, the first two times of channel detection with a duration equal to CCA slot detect that the wireless carrier is in an idle state, at which time the value of N is reduced to 6, and the last 4 times of channel detection with a duration equal to CCA slot detect that the wireless carrier is not in an idle state, then the device detects that the wireless carrier is in an idle state within a delay duration (defer duration), at which time the value of N is reduced to 5, then the device continues idle channel assessment, and after the consecutive times (5 times) of channel detection with a duration equal to CCA slot pass, the value of N is reduced to 0 to access the channel, and transmit data on the channel. At this time, since there are multiple (4) times of idle channel evaluations failing when LBT is performed in the first back-off count-down, that is, there are multiple channel collisions in this process, an increase in CWS will be triggered, so that the probability of taking a larger value when the device randomly selects the back-off time again increases.

After accessing the channel, the device without the licensed spectrum cannot always occupy the channel, but has a maximum channel occupation time, and the maximum channel occupation time can be shared among the devices. When a device (e.g., a network device) in the unlicensed spectrum wants to send data to another device (e.g., a terminal device) in the unlicensed spectrum, the network device performs LBT and then accesses the channel to obtain an MCOT (assumed to be 8ms) and sends data to the terminal device in the MOCT. The network device sends data to the terminal device, which takes part of the time (assumed to be 4ms) in the MCOT, and the remaining part of the time can be shared with the terminal device. Optionally, the terminal device performs LBT with a fixed duration that does not include the random backoff procedure, and after the LBT is successful, may send data with a duration that does not exceed the MCOT remaining time to the network device. Optionally, if an interval between a start time when the terminal device sends data to the network device and an end time when the network device sends data to the terminal device is smaller than a certain threshold, the terminal device may directly send data to the network device without LBT, where the duration of the data does not exceed the MCOT remaining time.

The Carrier Aggregation (CA) technology is a key technology in LTE-a, and the CA technology can aggregate multiple Component Carriers (CCs) together, thereby realizing a transmission bandwidth larger than that of a single CC, and effectively increasing the uplink and downlink data transmission rate. A multi-subband system refers to a communication device (e.g., a network device, a terminal device, etc.) whose operating bandwidth is divided into multiple continuous subbands or multiple discontinuous subbands, and a communication device (e.g., a network device) may communicate with a corresponding communication device (e.g., a terminal device) using one or more subbands, for example, a network device may communicate with a terminal device using one or more subbands. Optionally, the multi-subband system may be a Carrier Aggregation (CA) system, and the subbands are CCs. The multi-subband system may also be a plurality of bandwidth parts (BWPs) in one cell in the NR system, and the subbands are BWPs. Each subband in the multi-subband system represents a segment of frequency domain resource, and the specific name is not limited herein. For convenience of description, the multi-subband system is described below by taking CC as an example.

The unlicensed spectrum has a large bandwidth, as shown in table 1 below, where table 1 is a 5GHz unlicensed spectrum. The MulteFire technology may also aggregate adjacent or non-adjacent frequency spectrums together for data transmission, if allowed by the device.

Unlicensed spectrum for table 15 GHz

Region of land	Europe	USA	China
Frequency spectrum interval (MHz)	5150-5350,5470-5725	5150-5350,5470-5850	5150-5350,5470-5850

Referring to fig. 4, fig. 4 is a schematic diagram of multiple subbands for carrier aggregation according to an embodiment of the present application. As shown in fig. 4, in the multi-sub-band system, the operating bandwidth of 80MHz is composed of 4 sub-bands of 20MHz (such as CC1, CC2, CC3 and CC 4). In the MulteFire network, downlink transmission from network equipment to terminal equipment and uplink transmission from the terminal equipment to the network equipment in the unlicensed spectrum adopt a time division mode. That is, each 20MHz CC in the above 80MHz operating bandwidth is used for uplink data transmission or downlink data transmission in a time division manner.

In a multi-subband system, in order to better transmit data between devices in unlicensed spectrum, it is necessary to increase the LBT efficiency during the access of the devices in unlicensed spectrum to a channel. The method provided by the embodiment of the present application may allow the network device to notify the terminal device of which sub-bands LBTs that do not transmit the downlink data are successful through the indication information carried in the carrier that transmits the downlink data after LBTs in the plurality of sub-bands (such as the component carrier) are successful, so that the terminal device can perform 'LBTs of a fixed time length' that is easier to succeed than, for example, cat.4 LBTs on the sub-band indicated by the LBT successful sub-band indication information included in the indication information, so that uplink data can be transmitted to the network device on one or more sub-bands where LBTs are successful, the opportunity that the terminal device obtains channel usage is increased, the efficiency that the terminal device accesses the channel is increased, and the applicability is stronger. Optionally, the indication information may be DCI.

The method provided in the embodiment of the present application may also allow the terminal device to notify the network device of which sub-bands not sending the uplink data have successful LBT through information (e.g., uplink control information) carried in a carrier sending the uplink data after LBT succeeds in the multiple sub-bands (e.g., multiple CCs), so that the network device can perform 'LBT with a fixed time length' that is easier to succeed than, for example, cat.4LBT on the sub-band indicated by the LBT successful sub-band indication information included in the uplink control information, so that the network device can send downlink data to the terminal device on one or multiple sub-bands where LBT succeeds, thereby increasing an opportunity for the network device to obtain channel usage right, further increasing efficiency for the network device to access a channel, and having stronger applicability.

The method provided by the embodiment of the present application may also be applicable to any two data interaction devices (such as device 1 and device 2) in the unlicensed spectrum to use the unlicensed spectrum, where any two data interaction devices may be devices having an interaction process of data transmission, for example, device 1 may transmit data to device 2, device 2 may also transmit data to device 1, and the like, which may be specifically determined according to an actual application scenario, and is not limited herein. For convenience of description, the device 1 and the device 2 may be exemplified. The method provided by the embodiment of the present application allows device 1 to notify device 2 of which sub-bands LBTs that do not transmit data are still successful through information (e.g. control information) carried in a carrier that transmits data after LBTs in multiple sub-bands (e.g. CCs) are successful, so that device 2 can perform LBTs of a 'fixed time length' that is easier to succeed than, for example, cat.4LBT on the sub-band indicated by LBT successful sub-band indication information included in the control information by device 1, so that data can be transmitted to device 1 on one or more sub-bands where LBT succeeds, the chance that device 2 obtains channel usage is increased, the efficiency of device 2 accessing a channel is increased, and the applicability is stronger.

The following describes a specific implementation of the method provided in the embodiment of the present application, taking a network device as the device 1 and a terminal device as the device 2 as an example.

Referring to fig. 5, fig. 5 is an interaction diagram of a method for data transmission according to an embodiment of the present application. The method provided by the embodiment of the application can comprise the following steps:

s501, the network device performs LBT on a plurality of subbands.

In some possible embodiments, when the network device needs to transmit data to the terminal device, the network device may perform LBT on multiple subbands, and may further transmit data to the terminal device on one or more subbands where LBT is successful. For example, when a network device wants to send data on multiple CCs, the network device may perform LBT on the multiple CCs so that the data may be sent on CCs on which LBT succeeds. Optionally, when the network device performs LBT on multiple subbands, any one of the following four implementations of LBT may be employed:

the first implementation mode comprises the following steps:

when a network device may perform cat.4LBT on each sub-band (e.g., CC), and perform LBT again a short time before a specific time cell boundary, the transmission times of multiple sub-bands are aligned, and data may be transmitted on one or more sub-bands where LBT succeeds. The specific time unit may refer to a subframe in an LTE system, a slot in an LTE system, a subframe in an NR system, or a slot in an NR system, which is not limited herein.

Here, the specific time cell boundary may be a boundary of a 1ms time unit. It can be understood that, in the LTE system, a radio frame in the LTE system has a length of 10ms, where the radio frame includes 10 subframes of 1ms, and when the network device sends data to the terminal device, the carrier carrying the data mainly adopts a subcarrier interval of 15kHz, where the 1ms subframe time corresponds to 14 symbols. In LTE, 7 symbols (i.e., 0.5ms) are referred to as one slot. Similar to the LTE system, the length of one radio frame is still 10ms in the 5G NR system, which includes 10 subframes of 1 ms. The number of symbols contained in each sub-frame is typically 14 × n, n being 1 for a 15kHz subcarrier spacing; for a 30kHz subcarrier spacing, n-2; for a 60kHz subcarrier spacing, n-4; for a 120kHz subcarrier spacing, n-8, and so on. The definition of the slot in NR is different from that in LTE, and since NR usually refers to 14 symbols as 1 slot, the number of slots in a 1ms subframe is n. The time slot and the clear channel aware slot (CCA slot) in the LTE system or the NR system described above are different concepts.

In the first LBT method, the short-time LBT may have a fixed time length. For example, when the network device succeeds in performing cat.4LBT on any sub-band, which is different from the 1ms subframe boundary by 0.434ms, the network device waits for 0.4ms and then performs short-time LBT of 0.034 ms. In other words, at this time, after the network device performs successful LBT of cat.4, before the subframe boundary of 1ms, LBT of 0.034ms is performed once, where the LBT of 0.034ms is a short-time LBT, and the fixed time length of the short-time LBT is 0.034 ms.

Here, the fixed time length and p of the short-time LBT₀In connection with, p₀Associated with channel access priority type, e.g. p above₀Can be 1,3, 7. When p is₀When the value of (1) is obtained, the fixed time length of the corresponding short time LBT is (1 × 0.009+0.016) ms, i.e., 0.025 ms. When p is₀When the value of (2) is 3, the fixed time length of the corresponding short time LBT is (3 × 0.009+0.016) ms, i.e. 0.043 ms. When p is₀When the value of (1) is 7, the fixed time length of the corresponding short time LBT is (7 x 0.009+0.016) ms,i.e. 0.079 ms. Wherein, the above 0.009ms is an optional CCA slot duration, that is, an optional CCA slot duration T_sl9 us. The aforementioned 0.016ms is an optional delay duration (defer duration). The 0.025ms mentioned above is an alternative length of time for the cat.2LBT mentioned above.

The second embodiment:

when a network device needs to transmit data, it may randomly select a sub-band or perform cat.4LBT in a specific sub-band (e.g., sub-band 1), and after cat.4LBT in sub-band 1 succeeds, if the network device has not transmitted data after the LBT success, and the network device detects that subband 1 is idle for a delay duration (defer duration) immediately before the time instant when the data is transmitted (e.g., a particular time cell boundary), and when it is detected that the other sub-band is in the idle state for the cat.2LBT duration immediately before transmitting data, the network device may obtain the MCOT in all or some of the above-mentioned LBT-successful subbands, and downlink data may be sent on part or all of the subbands in the obtained MCOT, and a remaining time length of the MCOT excluding a downlink time length for sending the downlink data may be shared with the terminal device.

Referring to fig. 6, fig. 6 is a schematic diagram of a multi-subband LBT provided in the embodiment of the present application. As shown in fig. 6, when the network device needs to transmit data, cat 4lbt may be performed on subband 1, so that the MCOT may be obtained and data may be transmitted to the terminal device (i.e., downlink data may be transmitted) when cat 4lbt is successful. When the network device succeeds in cat.4lbt on subband 1, assuming that the difference between the subframe boundary of the network device and the subframe boundary of 1ms is 0.434ms, the network device may wait for 0.409ms, and then perform cat.2lbt with a delay duration (defer duration) of 0.025ms, so that an MCOT may be obtained when the cat.2lbt succeeds and data is sent to the terminal device (i.e., downlink data is sent), and a remaining time length obtained by subtracting the time length for sending the downlink data from the MCOT may be shared with the terminal device. If the terminal device needs to send data to the network device, at this time, the terminal device only needs to perform cat.2LBT on subband 1, and send data (i.e., send uplink data) to the network device when cat.2LBT succeeds. As shown in fig. 6, when the network device performs cat.4lbt successfully on subband 1, assuming that the difference between the subframe boundary of this time and 1ms is 0.434ms, the network device may wait for 0.409ms, and then perform cat.2LBT of 0.025ms on subband 2, subband 3, and subband 4, and align the transmission time of each subband, so that MCOT may be obtained on the subbands (e.g., subband 2 and subband 3) where cat.2LBT succeeds and downlink data is transmitted, and the remaining time length of MCOT from which the time length for transmitting downlink data is subtracted may be shared with the terminal device. The network device corresponding to the sub-band (e.g. sub-band 4) in which cat.2LBT fails does not send downlink data until the next time sub-band 4 is LBT successfully. As shown in fig. 6, when the network device sends downlink data to the terminal device on the cat.2LBT successful subband, the MCOT of the subband may be shared to the terminal device, and for the subband (for example, subband 4) in which cat.2LBT is unsuccessful or the network device does not send downlink data, the MCOT of the subband may not be shared to the terminal device. For a subband in which the network device sends downlink data, if the time length of the sent data is less than or equal to the remaining time length of MCOT shared to the terminal device when the terminal device needs to send data, it only needs to perform cat.2LBT on the subband, and if cat.2LBT succeeds, uplink data (such as subband 1 and subband 2) can be sent on the subband, and if cat.2LBT fails, uplink data (such as subband 3) is not sent on the subband.

The third embodiment is as follows:

when a network device needs to transmit data, one sub-band may be randomly selected or cat.4LBT may be performed in a specific sub-band (e.g., in sub-band 1), and when cat.4LBT in sub-band 1 may be successful after a cat.2LBT duration, cat.2lbt may be performed in other sub-bands in order to align transmission times of multiple sub-bands (e.g., multiple CCs). If cat.4lbt of subband 1 succeeds and some other subbands cat.2 succeeds, the network device may obtain MCOT in all or some subbands in the subband where LBT succeeds, and may send downlink data in some or all subbands in the subband where MCOT is obtained, and a remaining time length of MCOT excluding a downlink time length for sending the downlink data may be shared to the terminal device. The fourth embodiment:

optionally, the network device may perform LBT on multiple sub-bands based on the implementation manners provided in the first embodiment and/or the second embodiment and/or the third embodiment, and for multiple sub-bands for which LBT succeeds, the network device may select 1 or part of sub-bands (for example, sub-band 1) at the beginning of the MCOT to transmit downlink data, and perform LBT for a fixed time length again before wanting to transmit data on other sub-bands for which LBT succeeds, as shown in fig. 7, where fig. 7 is another schematic diagram of multi-sub-band LBT provided in this embodiment of the present application. In the fourth embodiment, after the LBT of multiple subbands is successful, the network device may select a subband with partial LBT success at the beginning of the MCOT to transmit downlink data, and may perform LBT with a fixed time length on other subbands in the middle part of the subsequent MCOT, so as to transmit downlink data on all or part of subbands with fixed time length LBT success in other subbands. The network device may send downlink data on each sub-band successful in LBT and share the MCOT of each sub-band sending data to the terminal device, thereby allowing the terminal device to perform LBT on each sub-band using cat.2lbt with relatively higher efficiency, and thus performing channel access through the sub-band successful in LBT. However, in this implementation, the network device selects a part of subbands to transmit downlink data at the beginning of the MCOT, and selects other subbands with successful LBT to perform LBT for a fixed time length in the middle of the subsequent MCOT, which may result in failure of LBT for the fixed time length, so that the network device loses the right to occupy the channel. For example, when the network device selects a part of subbands to send downlink data when the MCOT starts, and other subbands with successful LBT perform LBT for a fixed time length in the middle of the subsequent MCOT, if some other devices perform LBT for the subband successfully within the period from the MCOT start to the MCOT and send data on the subband, the network device will fail to perform LBT for the fixed time length, and thus the terminal device will lose the right to occupy the channel, and the terminal device cannot obtain the right to use the subband.

S502, the network device sends indication information to the terminal device on one or more subbands in the first subband set.

In some possible embodiments, in order to increase the chance that the terminal device obtains the channel usage right, after performing LBT on multiple subbands, the network device may send downlink data to the terminal device on any one or multiple subbands, so that the terminal device may be notified of the subband resource indication information of each other subband through the indication information carried in the downlink data. For convenience of description, the first subband set may be used to illustrate one or more subbands used by the network device to send downlink data to the terminal device. In other words, the first set of subbands includes one or more subbands of the plurality of subbands for which network device LBT was successful. The subband resource indication information included in the indication information may be used to indicate subband resources of zero, one, or multiple other subbands for which LBT is successful. For convenience of description, the second subband set may be used for illustration. In other words, the second subband set includes zero, one, or multiple subbands of the plurality of subbands that the network device successfully performs LBT except for all subbands in the first subband set used for transmitting downlink data.

In some possible embodiments, the network device may send the sub-band identifier information of each sub-band in the second sub-band set, and sub-band resource indication information such as MCOT of each sub-band in the second sub-band set to the terminal device through the indication information. It can be understood that the subband resource indication information carried in the indication information is used to indicate, but not limited to, subband identifier information of each subband and an MCOT of each subband included in the second subband set, and may be specifically determined according to an actual application scenario, which is not limited herein. The subband identification information of each subband included in the second subband set may include, but is not limited to, number information of the subband, a bandwidth size of the subband, and a type of the subband (e.g., a bandwidth portion in a CC or NR system in a carrier aggregation system). Optionally, the subband resource indication information included in the indication information may further include a total MCOT time length of each subband in the first subband set and a downlink time length occupied by the network device for sending downlink data to the terminal device in the total MCOT time length of each subband in the first subband set. Optionally, the subband resource indication information is further configured to indicate a remaining time length, which is obtained by dividing the total MCOT time length of each subband in the first subband set by a downlink time length occupied by the network device for sending data to the terminal device, in the total MCOT time length of each subband. In other words, the allowed transmission time lengths of the MCOTs of the sub-bands include { uplink time length, downlink time length }, the network device may issue the MCOT of each sub-band included in the first set of sub-bands and the downlink time length included in the MCOT of each sub-band included in the first set of sub-bands (i.e., the time length used for downlink transmission) to the terminal device through the indication information, and the terminal device may perform LBT on all or part of the sub-bands of the first set of sub-bands and transmit uplink data with a time length not exceeding the remaining time length (i.e., the uplink time length) of the MCOT of the corresponding sub-band in the first set except the downlink time length after LBT is successful. Optionally, the subband resource indication information is further configured to indicate a parameter or a channel access priority type of the LBT including a random backoff process, where the parameter or the channel access priority type of the LBT including the random backoff process, which is used by the network device, is used to indicate a total MCOT time length of each subband in the first subband set and/or the second subband set. That is, the subband resource indication information implicitly indicates the total MCOT time length of each subband in the first subband set by indicating a parameter of LBT including a random backoff procedure specifically adopted by the network device or a channel access priority type. Optionally, the subband resource indication information implicitly indicates the total MCOT time length of each subband in the second subband set by indicating a parameter of LBT including a random backoff process specifically adopted by the network device or a channel access priority type. Optionally, the total time lengths of the MCOT of each subband in the first subband set and each subband in the second subband set may be the same or different. Optionally, the downlink time length may be the same or different for each subband in the first subband set.

In some possible embodiments, the indication information sent by the network device to the terminal device on all or some of the subbands in the first set of subbands may be DCI. Optionally, the downlink control information may be carried in a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH). When the network device transmits PDCCH or EPDCCH, Cyclic Redundancy Check (CRC) is added after the DCI, and the CRC is scrambled by using various Radio Network Temporary Identities (RNTIs). Wherein, the RNTI includes but is not limited to: cell radio network temporary identity (Cell RNTI, C-RNTI), system information radio network temporary identity (system information RNTI, SI-RNTI), paging radio network temporary identity (paging RNTI, P-RNTI), random access radio network temporary identity (RA-RNTI), temporary Cell radio network temporary identity (TC-RNTI), semi-persistent scheduling Cell radio network temporary identity (SPS-C-RNTI), physical uplink control channel transmission power control radio network temporary identity (transmit power control-physical uplink-RNTI, TPC-PUCCH-RNTI), physical uplink shared channel transmission power control radio network temporary identity (transmit power control-physical uplink-RNTI), TPC-PUSCH-RNTI), multimedia broadcast multicast service radio network temporary identifier (M-RNTI), common control radio network temporary identifier (CC-RNTI).

In some possible embodiments, the indication information sent by the network device to the terminal device on all or part of subbands in the first subband set may be other information besides downlink control information, for example, downlink management information or other information. At this time, the indication information may be carried on other channels besides the PDCCH or the EPDCCH, for example, a Physical Downlink Shared Channel (PDSCH) channel.

S503, the terminal device receives the indication information sent by the network device on one or more subbands in the first subband set, and performs LBT on one or more subbands in the union set formed by the first subband set and the second subband set.

And S504, the terminal equipment transmits data to the network equipment on the sub-band with the successful LBT.

In some possible embodiments, the terminal device may send candidate positions of a PDCCH or an EPDCCH at the network device, and verify a CRC of data information carried in the candidate positions according to at least one preset RNTI. And when the terminal equipment successfully performs CRC verification on the data information, receiving indication information carried in the data information, namely downlink control information. Wherein the at least one RNTI includes but is not limited to: one or more of C-RNTI, SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI, SPS-C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, M-RNTI and CC-RNTI can be determined according to the actual application scene, and the determination is not limited herein.

In some possible embodiments, the terminal device may receive the indication information on other channels than the PDCCH and EPDCCH transmitted by the network device, such as the PDSCH transmitted from the network device.

The terminal device may determine, based on the received indication information, subband resource indication information of each subband in which network device LBT succeeds, including but not limited to subband identification information of each subband, MCOT of each subband, and the like, and may perform LBT on each subband through one or more of the following LBT methods one to three, thereby obtaining a channel usage weight.

The first LBT method:

in some possible embodiments, after the terminal device receives the indication information sent by the network device on one or more subbands in the first subband set, when a duration that the one or more subbands in the first subband set need to transmit uplink data is less than or equal to a remaining time length of MCOT, the terminal device only needs to perform cat.2LBT on a subband (i.e., each subband in the first subband set) where network device LBT succeeds and sends downlink data (i.e., LBT that does not include a random back-off procedure, i.e., LBT with a fixed time length). When the terminal device succeeds in cat.2lbt on each subband in the first set of subbands, the terminal device may send uplink data to the network device on each subband in the first set of subbands. Referring to fig. 8, fig. 8 is another schematic diagram of a multi-subband LBT provided in the embodiment of the present application. As shown in fig. 8, for a subband in the first subband set (e.g., subband 1), the terminal device may send uplink data to the network device after performing cat.2LBT successfully, where the time duration for the terminal device to send data to the network device is not greater than the remaining time duration excluding the downlink time duration in the total MCOT time duration of subband 1. For example, the MCOT of the sub-band 1 is 8ms, the time length for the network device to transmit the downlink data to the terminal device is 4ms, and the time length for the terminal device to transmit the uplink data to the network device is not greater than 4 ms.

LBT method II:

optionally, in some possible embodiments, as shown in fig. 8, for the subbands in the second subband set (i.e., subbands in which network device LBT succeeds but does not send downlink data, such as subband 2 and subband 3), the network device does not transmit downlink data after performing cat.2lbt successfully, at this time, subband resource indication information of subband 2 and subband 3 may be sent to the terminal device through indication information in the downlink data transmitted on subband 1, where the subband resource indication information indicates that a specific LBT (e.g., a fixed-time-length LBT) may be used when the terminal device sends data meeting a specific condition (e.g., a time length less than or equal to a total time length of MCOT, and a time length less than or equal to a remaining time length of the MCOT excluding the specific time length). When the terminal device needs to send uplink data to the network device, specific LBT (e.g., fixed time length LBT) may be performed on subband 2 and subband 3. At this time, the duration of the LBT with the fixed time length is greater than or equal to the duration of cat.2LBT (i.e., the channel listening time of cat.2lbt) of each subband (e.g., subband 1) in the first subband set in the LBT scheme one, so that the efficiency of performing LBT on multiple subbands by the terminal device can be improved, the chance of obtaining the channel usage right by the terminal device can be increased, and the transmission efficiency of sending uplink data to the network device by the terminal device can be improved. As shown in fig. 8, the LBT of the terminal device in subband 2 for the fixed time length is successful, the terminal device sends uplink data to the network device in subband 2, the LBT of the terminal device in subband 3 for the fixed time length is unsuccessful, and the terminal device does not send uplink data to the network device in subband 3.

Optionally, when the terminal device needs to send uplink data to the network device, specific LBT may be performed on subband 2 and subband 3. The specific LBT may be a fixed duration LBT with duration equal to the duration of cat.2lbt of various subbands (e.g., subband 1) in the first subband set in the first LBT manner. The specific LBT may also be LBT with other fixed time length, for example, the fixed time length of the specific LBT may be p₀In connection with, p₀Associated with channel access priority type, e.g. p above₀Can be 1,3, 7; when p is₀When the value of (1) is obtained, the fixed time length of the corresponding specific LBT is (1 × 0.009+0.016) ms, namely 0.025 ms; when p is₀When the value of (2) is 3, the fixed time length of the corresponding short-time specific LBT is (3 × 0.009+0.016) ms, namely 0.043 ms; when p is₀When the value of (1) is 7, the fixed time length of the corresponding specific LBT is (7 × 0.009+0.016) ms, namely 0.079 ms; wherein, the above 0.009ms is an optional CCA slot duration, that is, an optional CCA slot duration T_sl9 us; the above 0.016ms is an optional delay duration. The specific LBT may also be an LBT that includes a random back-off procedure.

LBT method three:

alternatively, in some possible implementations, refer to fig. 9 for another schematic diagram of multi-subband LBT provided in the embodiments of the present application. As shown in fig. 9, for a subband (for example, subband 1) in the first subband set, if the terminal device fails to perform cat.2lbt, it is unable to transmit uplink data to the network device on subband 1. For the sub-band (for example, sub-band 4) for which the network device has not been subjected to the LBT success, the terminal device may perform cat.4lbt on the sub-band 4, and further may transmit uplink data to the network device on the sub-band 4 when the cat.4lbt is successfully performed on the sub-band 4, thereby increasing the chance of obtaining the channel use right by the terminal device, and having more flexible operation and strong applicability.

S505, the network device receives data sent by the terminal device in one or more subbands in the union set formed by the first subband set and the second subband set.

In some possible embodiments, the network device sends the sub-band resource indication information of each sub-band in which LBT succeeds to the terminal device through downlink data transmitted on the sub-bands in the first sub-band set, so that the terminal device can perform LBT on each sub-band in which LBT succeeds to the network device (including cat.2 on each sub-band in the first sub-band set and LBT with a fixed time length on each sub-band in the second sub-band set), and the opportunity that the terminal device obtains channel usage right for transmitting uplink data to the network device is increased. The network equipment can receive the uplink data transmitted by the terminal equipment on one or more sub-bands with successful LBT, the terminal equipment adopts the LBT with fixed time length to carry out the LBT on the sub-bands with successful LBT of the network equipment but without sending the downlink data, at the moment, the time length of the LBT with the fixed time length is less than that of Cat.4LBT, the efficiency of carrying out the LBT on each sub-band by the terminal equipment is increased, the data transmission efficiency of the terminal equipment and the network equipment is increased, and the applicability is stronger.

In this embodiment of the present application, the network device sends, to the terminal device, the subband resource indication information of each subband in which LBT is successful through the indication information transmitted on the subband in which LBT is successful and downlink data is transmitted, and the terminal device may determine, based on the subband resource indication information carried in the indication information, other usable subbands except for the subband sent by the network device with downlink data, where the usable subband is a subband in which LBT of the network device is successful but downlink data is not sent, that is, a second subband. The terminal equipment can carry out LBT on each available subband, so that the successful probability of LBT can be increased, the effective utilization rate of each subband resource is improved, the data transmission efficiency of the terminal equipment and the network equipment is increased, and the applicability is stronger.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 10, the terminal device provided in the embodiment of the present application includes functional modules, such as a processor 101, a memory 102, a user interface 103, a communication interface 104, a coupler 105, and an antenna 106. The user interface 103, the communication interface 104, the antenna 106, and the like may be used as transceivers of terminal devices, and may be determined according to actual application scenarios, which is not limited herein. The memory 102 is used for storing programs, and particularly, the programs may include program codes including computer operation instructions. The memory 102 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable read-only memory (CD-ROM), and the like, and is not limited thereto. In addition, only one memory is shown in fig. 10, but of course, a plurality of memories may be provided as necessary. The memory 102 may also be a memory in the processor 101, and is not limited herein.

The memory 102 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof:

and (3) operating instructions: including various operational instructions for performing various operations.

Operating the system: including various system programs for implementing various basic services and for handling hardware-based tasks.

The processor 101 controls the operation of the terminal device, and the processor 101 may be one or more CPUs. The technical solutions implemented by the terminal devices disclosed in the above embodiments can be applied to the processor 101, or implemented by the processor 101. The processor 101 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 101. The processor 101 may be a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application 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 method steps disclosed in connection with the embodiments of the present application may be directly embodied as being performed by a hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in the memory 102, and the processor 101 reads the information in the memory 102 and executes the method steps executed by the terminal device described in the foregoing embodiments in combination with the hardware thereof.

The user interface 103 of the terminal device is mainly used for providing an input interface for a user and acquiring data input by the user. The user interface 103 may include, without limitation, a multimedia input and/or output device 1031, a camera 1032, and a display 1033, among others. The user interface 103 may be an information input and/or output module for interacting with a user of the terminal device, such as a microphone and/or a speaker of the terminal device, e.g., a mobile phone, a front-facing and/or rear-facing camera, a touch screen, and the like, without limitation. Optionally, the user interface 103 may also include a standard wired interface, a wireless interface, and the like, which is not limited herein.

The processor 101 of the terminal device may be coupled with an input device such as an antenna 106 through one or more communication interfaces 104 and couplers 105, and execute the implementation performed by the terminal device described in the foregoing embodiments in combination with other functional modules, which may specifically refer to the implementation provided in the foregoing embodiments, and is not limited herein. "coupled" means that two elements are joined to each other directly or indirectly. The combination may be fixed or movable, which may allow flowing fluid, electrical or other types of signals to be communicated between the two components.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present application. As shown in fig. 11, the network device provided in this embodiment of the present application includes a processor 1101, a memory 1102, a transmitter 1103, a receiver 1104, a network interface 1107 and the like. The transmitter 1103, the receiver 1104, and the network interface 1107 may be used as a transceiver of a network device, and may be determined according to an actual application scenario, which is not limited herein. The functional modules of the processor 1101, the transmitter 1103, the receiver 1104 and the like may be coupled to an input device such as an antenna 1106 through a coupler 1105. The processor 1101 may perform, in conjunction with the coupled functional modules, the implementation performed by the network device described in the foregoing embodiments, which may be specifically referred to the implementation provided in the foregoing embodiments, and is not limited herein. "coupled" means that two elements are joined to each other directly or indirectly. The combination may be fixed or movable, which may allow flowing fluid, electrical or other types of signals to be communicated between the two components.

The memory 1102 is used for storing programs, and specifically, the programs may include program codes including computer operation instructions. The memory 1102 includes, but is not limited to, RAM, ROM, EPROM, CD-ROM, or the like. The memory 1102 may be a memory in the processor 1101, and is not limited herein.

Memory 1102 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof:

The processor 1101 controls the operation of the network device, and the processor 1101 may be one or more CPUs. The methods implemented by the network devices disclosed in the above embodiments can be applied to the processor 1101 or implemented by the processor 1101. The processor 1101 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by instructions in the form of hardware, integrated logic circuits, or software in the processor 1101. The processor 1101 described above may be a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application 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 application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1102, and the processor 1101 reads the information in the memory 1102 and performs the method steps performed by the network device described in the above embodiments in combination with the hardware thereof. Optionally, the network interface 1107 may comprise a standard wired interface, a wireless interface (e.g., a WI-FI interface), or the like, without limitation.

In this embodiment of the present application, the network device sends, to the terminal device, the subband resource indication information of each subband in which LBT is successful through the indication information transmitted on the subband in which LBT is successful and downlink data is transmitted, and the terminal device may determine, based on the subband resource indication information carried in the indication information, other usable subbands except for the subband sent by the network device with downlink data, where the usable subband is a subband in which LBT of the network device is successful but downlink data is not sent, that is, a second subband. The terminal equipment can carry out LBT on each usable subband, thereby increasing the successful probability of LBT and improving the effective utilization rate of each subband resource. The network equipment can receive the data transmitted by the terminal equipment on one or more sub-bands, so that the data transmission efficiency of the terminal equipment and the network equipment is increased, and the applicability is stronger.

Referring to fig. 12, fig. 12 is another schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 12, a terminal device provided in an embodiment of the present application includes: a receiving unit 121 and a transmitting unit 122.

A receiving unit 121, configured to receive indication information sent by a network device on one or more subbands in a first subband set, where the indication information includes subband resource indication information, the subband resource indication information is used to indicate a second subband set where the network device succeeds in listen before talk LBT, and the second subband set includes one or more subbands, excluding each subband in the first subband set, in subbands where the network device succeeds in LBT.

A sending unit 122, configured to perform LBT on one or more subbands in the second subband set, and send data to the network device on one or more subbands in which LBT succeeds.

In some possible embodiments, the subband resource indicator indicates subband id information of the second subband set; the above terminal device further includes:

a channel listening unit 123, configured to determine, according to the subband identification information of the second subband set, one or more subbands that are included in the second subband set and successfully subjected to LBT by the network device, and perform LBT with a fixed time length without a random back-off procedure on the one or more subbands included in the second subband set.

The transmitting unit 122 is configured to transmit data to the network device on one or more subbands where the channel monitoring unit succeeds in performing LBT for a fixed time length.

In some possible embodiments, the subband resource indicator indicates a maximum channel occupying time MCOT of each subband in the second subband set;

the length of time for which the transmitting unit 122 transmits data to the network device on the LBT-successful subband included in the second subband set is not greater than the MCOT of the LBT-successful subband.

In some possible embodiments, the subband resource indication information is further configured to indicate a total MCOT time length of each subband in the first subband set and a downlink time length occupied by the network device for sending data to the terminal device in the total MCOT time length of each subband.

In some possible embodiments, the subband resource indicator is further configured to indicate a parameter or a channel access priority type of the LBT including a random back-off procedure, where the parameter or the channel access priority type of the LBT including a random back-off procedure is used by the network device to indicate a total MCOT time length of each subband in the first subband set and/or the second subband set.

In some possible embodiments, the subband resource indicator is further configured to indicate a remaining time length of the MCOT total time length of each subband in the first subband set, excluding a downlink time length occupied by the network device for transmitting data to the terminal device in the MCOT total time length of each subband.

In some possible embodiments, the channel listening unit 123 is further configured to perform LBT without a random backoff procedure on one or more subbands in the first subband set.

The transmitting unit 122, configured to, when the channel monitoring unit succeeds LBT on one or more subbands in the first subband set, transmit data to the network device on one or more subbands in the first subband set where LBT succeeds;

the time length for the transmitting unit 122 to transmit data to the network device on the LBT successful subband included in the first subband set is not greater than the MCOT remaining time length of the LBT successful subband, where the MCOT remaining time length is a remaining time length of the MCOT total time length excluding the downlink time length.

In a specific implementation, the terminal device may execute, through each built-in unit thereof, the implementation manner executed by the terminal device in the foregoing embodiments, so that beneficial effects (or advantages) of the implementation manner provided in each step of each embodiment can also be achieved, and details are not described herein again. For example, the receiving unit 121 may be configured to perform operations such as receiving the indication information provided by the above embodiments. The sending unit 122 may be configured to execute the implementation manner for sending data to the network device according to the foregoing embodiments, which is not limited herein. The channel listening unit 123 may be configured to perform operations such as LBT on each subband provided in the foregoing embodiments, and specifically refer to implementation manners provided in each step of the foregoing embodiments.

Referring to fig. 13, fig. 13 is another schematic structural diagram of a network device according to an embodiment of the present application. As shown in fig. 13, the terminal device provided in the embodiment of the present application includes: a channel listening unit 131, a transmitting unit 132, and a receiving unit 133.

A channel listening unit 131, configured to listen before talk, LBT, on a plurality of subbands.

A sending unit 132, configured to send indication information to a terminal device on one or more subbands in a first subband set, where the first subband set includes one or more subbands in which LBT performed by the channel monitoring unit succeeds in the multiple subbands, the indication information includes subband resource indication information, the subband resource indication information is used to indicate a second subband set in which LBT succeeds, and the second subband set includes one or more subbands excluding each subband in the first subband set, in the subbands in which LBT performed by the network device succeeds.

A receiving unit 133, configured to receive data sent by the terminal device in one or more subbands in the second subband set.

In some possible embodiments, the subband resource indicator indicates subband id information of each subband in the second subband set, and a maximum channel occupation time MCOT of each subband in the second subband set.

In a specific implementation, the network device may execute, through each built-in unit thereof, an implementation manner performed by the network device in the foregoing embodiments, which may be specifically referred to as an implementation manner provided in each step of the foregoing embodiments. Therefore, the beneficial effects (or advantages) of the implementation manners provided in the steps of the above embodiments can also be achieved, and are not described herein again. For example, the channel listening unit 131 may be configured to perform operations such as LBT on each subband provided in the foregoing embodiments, the transmitting unit 132 may be configured to perform implementations of transmitting indication information and/or data to the terminal device in the foregoing embodiments, and the receiving unit 133 may be configured to perform implementations of receiving data from the terminal device in the foregoing embodiments, specifically, refer to the implementations provided in each step of the foregoing embodiments.

An embodiment of the present application provides a communication apparatus, where the communication apparatus may be a chip or multiple chips working in cooperation, and the communication apparatus includes an input device coupled to the communication apparatus (e.g., a chip) and configured to execute an implementation manner executed by a terminal device provided in the embodiments of the present application in the above embodiments, which may specifically refer to a technical scheme implemented by the terminal device in the above embodiments, and is not described herein again. It should be understood that "coupled" herein means that two components are directly or indirectly joined to each other. The combination may be fixed or movable, which may allow flowing fluid, electrical or other types of signals to be communicated between the two components.

An embodiment of the present application provides a communication apparatus, where the communication apparatus may be a chip or multiple chips working in cooperation, and the communication apparatus includes an input device coupled to the communication apparatus (e.g., a chip) and configured to execute an implementation manner executed by a network device provided in the embodiments of the present application in the above-mentioned embodiments. It should be understood that "coupled" herein means that two components are directly or indirectly joined to each other. The combination may be fixed or movable, which may allow flowing fluid, electrical or other types of signals to be communicated between the two components.

The embodiment of the present application provides a communication system, which includes a transceiver and a processor, where the transceiver and the processor are used to couple with a memory, and a terminal device that reads and executes instructions in the memory to support data transmission implements the technical solution implemented by the terminal device in the foregoing embodiment. In one possible design, the communication system further includes a memory for storing program instructions and data necessary for the terminal device for channel access. The communication system may be constituted by a chip, or may comprise a chip and other discrete devices.

An embodiment of the present application provides a communication system, where the communication system includes a transceiver processor, and the transceiver processor is configured to couple with a memory, read and execute instructions in the memory for a network device supporting data transmission, to implement the technical solution implemented by the network device in the foregoing embodiment. In one possible design, the communication system further includes a memory for storing program instructions and data necessary for the network device to access the channel. The communication system may be constituted by a chip, or may comprise a chip and other discrete devices.

An embodiment of the present application provides a computer-readable storage medium, where an instruction is stored in the computer-readable storage medium, and when the instruction runs on a terminal device, the terminal device is enabled to execute an implementation manner executed by the terminal device, which is described in each step of the foregoing embodiment, which may specifically refer to the implementation manner provided in each step in the foregoing embodiment, and is not described herein again.

An embodiment of the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are run on a network device, the network device is enabled to execute an implementation manner executed by the network device, which is described in each step of the foregoing embodiment, which may specifically refer to the implementation manner provided in each step in the foregoing embodiment, and details are not described here again.

An embodiment of the present application further provides a computer program product including instructions, which, when running on a terminal device, enables the terminal device to execute the implementation manner executed by the terminal device described in the foregoing embodiment.

Embodiments of the present application further provide a computer program product containing instructions, which, when run on a network device, causes the network device to execute the implementation manner executed by the network device described in the foregoing embodiments.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

A method of data transmission, the method comprising:

the method comprises the steps that terminal equipment receives indication information sent by network equipment on one or more sub-bands in a first sub-band set, wherein the indication information comprises sub-band resource indication information, the sub-band resource indication information is used for indicating a second sub-band set which is successfully listened to before LBT of the network equipment, and the second sub-band set comprises one or more sub-bands except sub-bands in the first sub-band set in the sub-bands which are successfully LBT of the network equipment;

and the terminal equipment performs LBT on one or more subbands in the second subband set and sends data to the network equipment on one or more subbands with successful LBT.
The method of claim 1, wherein the subband resource indicator information indicates subband identification information for the second set of subbands;

the terminal device performs LBT on one or more subbands in the second subband set, and sending data to the network device on one or more subbands for which LBT is successful includes:

the terminal equipment determines one or more sub-bands which are included in the second sub-band set and successfully subjected to LBT by the network equipment according to the sub-band identification information of the second sub-band set;

the terminal device performs fixed-time-length LBT without a random backoff procedure on the one or more subbands included in the second subband set, and transmits data to the network device on one or more subbands in which the fixed-time-length LBT is successful.
The method according to claim 1 or 2, wherein the subband resource indicator information is used to indicate a maximum channel occupation time MCOT of each subband in the second set of subbands;

the terminal device transmits data to the network device on the LBT successful subband included in the second subband set for a time length not greater than the MCOT of the LBT successful subband.
The method according to claim 3, wherein the subband resource indicator information is further used to indicate a total MCOT time length of each subband in the first subband set and a downlink time length occupied by the network device for transmitting data to the terminal device in the total MCOT time length of each subband.
The method according to claim 4, wherein the subband resource indicator information is further used to indicate a parameter or a channel access priority type of LBT used by the network device including a random back-off procedure, and the parameter or the channel access priority type of LBT used by the network device including the random back-off procedure is used to indicate a total MCOT time length of each subband in the first subband set and/or the second subband set.
The method according to claim 3, wherein the subband resource indication information is further used to indicate a remaining time length after a total time length of MCOT of each subband in the first subband set is removed from a downlink time length occupied by the network device for transmitting data to the terminal device in the total time length of MCOT of each subband.
The method according to claim 4 or 6, characterized in that the method further comprises:

the terminal device performs LBT without a random backoff process on one or more subbands in the first set of subbands;

when the terminal device succeeds in LBT on one or more subbands in the first subband set, transmitting data to the network device on the one or more subbands in the first subband set, where LBT succeeds;

wherein, the time length for the terminal device to send data to the network device on the LBT successful subband included in the first subband set is not greater than the MCOT remaining time length of the LBT successful subband, and the MCOT remaining time length is the remaining time length excluding the downlink time length in the MCOT total time length of the LBT successful subband.
A method of data transmission, the method comprising:

the method comprises the steps that network equipment Listens Before Talks (LBT) on a plurality of sub-bands and sends indication information to terminal equipment on one or more sub-bands in a first sub-band set, wherein the first sub-band set comprises one or more sub-bands, successful in LBT, of the plurality of sub-bands, the indication information comprises sub-band resource indication information, the sub-band resource indication information is used for indicating a second sub-band set, successful in LBT, of the sub-bands, and the second sub-band set comprises one or more sub-bands, except for each sub-band in the first sub-band set, of the sub-bands, successful in LBT of the network equipment;

and the network equipment receives the data sent by the terminal equipment at one or more subbands in the second subband set.
The method of claim 8, wherein the subband resource indicator indicates subband identification information of each subband in the second set of subbands, and a Maximum Channel Occupying Time (MCOT) of each subband in the second set of subbands.
The method according to claim 8 or 9, wherein the subband resource indication information is further used to indicate a total MCOT time length of each subband in the first subband set and a downlink time length occupied by the network device for transmitting data to the terminal device in the total MCOT time length of each subband.
The method according to claim 8 or 9, wherein the subband resource indication information is further used to indicate a remaining time length after a total time length of MCOT of each subband in the first subband set is removed from a downlink time length occupied by the network device for transmitting data to the terminal device in the total time length of MCOT of each subband.
A terminal device, characterized in that the terminal device comprises:

a receiving unit, configured to receive indication information sent by a network device on one or more subbands in a first subband set, where the indication information includes subband resource indication information, and the subband resource indication information is used to indicate a second subband set where the network device succeeds in listen before talk LBT, and the second subband set includes one or more subbands, excluding each subband in the first subband set, in subbands where the network device succeeds in LBT;

a sending unit, configured to perform LBT on one or more subbands in the second subband set, and send data to the network device on one or more subbands successful in LBT.
The terminal device of claim 12, wherein the subband resource indicator information is used to indicate subband identification information of the second set of subbands; the terminal device further includes:

a channel monitoring unit, configured to determine, according to the subband identification information of the second subband set, one or more subbands in the second subband set that the network device succeeds in LBT, and perform LBT with a fixed time length without a random back-off procedure on the one or more subbands in the second subband set;

the sending unit is configured to send data to the network device on one or more subbands where LBT of a fixed time length is successfully performed by the channel monitoring unit.
The terminal device according to claim 12 or 13, wherein the subband resource indicator information is used to indicate a maximum channel occupation time MCOT of each subband in the second subband set;

the transmitting unit transmits data to the network device on an LBT-successful subband included in the second set of subbands for a length of time not greater than an MCOT of the LBT-successful subband.
The terminal device of claim 14, wherein the subband resource indication information is further configured to indicate a total time length of MCOT of each subband in the first subband set and a downlink time length occupied by the network device for sending data to the terminal device in the total time length of MCOT of each subband.
The terminal device according to claim 15, wherein the subband resource indicator information is further used to indicate a parameter or a channel access priority type used by the network device to include LBT of a random back-off procedure, and the parameter or the channel access priority type used by the network device to include LBT of a random back-off procedure is used to indicate a total MCOT time length of each subband in the first subband set and/or the second subband set.
The terminal device of claim 14, wherein the subband resource indication information is further configured to indicate a remaining time length after a total time length of MCOT of each subband in the first subband set is removed from a downlink time length occupied by the network device for sending data to the terminal device in the total time length of MCOT of each subband.
The terminal device according to claim 15 or 17,

the channel listening unit is further configured to perform LBT without a random backoff procedure on one or more subbands in the first subband set;

the transmitting unit is configured to, when the channel listening unit succeeds in LBT on one or more subbands in the first subband set, transmit data to the network device on the one or more subbands in the first subband set that succeed in LBT;

wherein, the time length for the sending unit to send data to the network device on the LBT successful subband included in the first subband set is not greater than the MCOT remaining time length of the LBT successful subband, and the MCOT remaining time length is the remaining time length excluding the downlink time length in the MCOT total time length.
A network device, characterized in that the network device comprises:

a channel monitoring unit, configured to perform listen before talk, LBT, on a plurality of subbands;

a sending unit, configured to send indication information to a terminal device on one or more subbands in a first subband set, where the first subband set includes one or more subbands in which LBT performed by the channel monitoring unit successfully in the multiple subbands, and the indication information includes subband resource indication information, where the subband resource indication information is used to indicate a second subband set in which LBT performed successfully, and the second subband set includes one or more subbands excluding each subband in the first subband set, in subbands in which LBT performed successfully by the network device;

a receiving unit, configured to receive data sent by the terminal device in one or more subbands in the second subband set.
The network device of claim 19, wherein the subband resource indicator indicates subband identification information for each subband in the second set of subbands, and a Maximum Channel Occupancy Time (MCOT) for each subband in the second set of subbands.
The network device according to claim 18 or 19, wherein the subband resource indication information is further configured to indicate a total MCOT time length of each subband in the first subband set and a downlink time length occupied by the network device for transmitting data to the terminal device in the total MCOT time length of each subband.
The network device according to claim 18 or 19, wherein the subband resource indication information is further configured to indicate a remaining time length after a total time length of MCOT of each subband in the first subband set is removed from a downlink time length occupied by the network device for transmitting data to the terminal device in the total time length of MCOT of each subband.