Information Transmission Method, Apparatus and Communication Device

Abstract

Embodiments of the present disclosure relate to an information transmission method, apparatus, and communication device. In response to detecting downlink control information (DCI) sent by a base station to the UE for scheduling physical downlink shared channel (PDSCH) resources on an unlicensed spectrum physical downlink control channel (PDCCH) resource, an occupancy signal is sent; wherein the occupancy signal is used to indicate a channel for determining occupancy of the PDSCH resource.

Description

Technical Field

[0001] This application relates to the field of wireless communication technologies, but is not limited to wireless communication technologies, and in particular, relates to an information transmission method, apparatus, and communication device. Background Art

[0002] In unlicensed spectrum (NR-U, New Radio - Unlicensed), before a transmitting end sends data, it usually needs to perform a Clear Channel Assessment (CCA) to evaluate the interference level in the channel. If the interference is lower than the energy detection threshold, the transmitting end considers the channel idle and can occupy the channel to send data. If the interference level is higher than the detection threshold, the transmitting end considers the channel busy and cannot occupy the channel to send data. This is the Listen Before Talk (LBT) channel access mechanism.

[0003] However, LBT cannot solve the hidden node problem in unlicensed spectrum communication. As Figure 1 shown in, TX1 is about to send data to RX1. Before sending, TX1 performs CCA. At this time, TX2 is sending data to RX2, and the signal it sends will interfere with the reception of RX1. Since TX1 is far from TX2, the interference from TX2 cannot be detected during CCA, so TX1 will occupy the channel to send data to RX1. In this case, the data reception of RX1 is strongly interfered by TX2. For TX1, TX2 is a hidden node. Summary of the Invention

[0004] In view of this, embodiments of the present disclosure provide an information transmission method, apparatus, and communication device.

[0005] According to a first aspect of the embodiments of the present disclosure, an information transmission method is provided, which is applied to a User Equipment (UE). The method includes:

[0006] In response to detecting, on a Physical Downlink Control Channel (PDCCH) resource in unlicensed spectrum, downlink control information (DCI) sent by a base station to the UE for scheduling a Physical Downlink Shared Channel (PDSCH) resource in the unlicensed spectrum, sending an occupancy signal;

[0007] Wherein, the occupancy signal is used to indicate a channel for determining to occupy the PDSCH resource.

[0008] According to a second aspect of the embodiments of the present disclosure, an information transmission method is provided. Wherein, it is applied to a base station, and the method includes:

[0009] Using a PDCCH resource in the unlicensed spectrum to send DCI for scheduling a PDSCH resource on the unlicensed spectrum to a UE;

[0010] Receiving an occupancy signal sent by the UE in response to the DCI, where the occupancy signal is further used to indicate determining the channel corresponding to occupying the PDSCH resource;

[0011] Transmitting downlink data on the PDSCH resource according to the occupancy signal.

[0012] According to a third aspect of the embodiments of the present disclosure, an information transmission device is provided. Wherein, it is applied to a UE, and the device includes: a first transmission module, wherein,

[0013] The first transmission module is configured to send an occupancy signal in response to detecting DCI sent by the base station to the UE for scheduling a PDSCH resource on the unlicensed spectrum on a PDCCH resource in the unlicensed spectrum;

[0014] Wherein, the occupancy signal is used to indicate determining the channel corresponding to occupying the PDSCH resource.

[0015] According to a fourth aspect of the embodiments of the present disclosure, an information transmission device is provided. Wherein, it is applied to a base station, and the device includes: a second transmission module, a first reception module, and a transmission module, wherein,

[0016] The second transmission module is configured to use a PDCCH resource in the unlicensed spectrum to send DCI for scheduling a PDSCH resource on the unlicensed spectrum to a UE;

[0017] The first reception module is configured to receive an occupancy signal sent by the UE in response to the DCI, where the occupancy signal is further used to indicate determining the channel corresponding to occupying the PDSCH resource;

[0018] The transmission module is configured to transmit downlink data on the PDSCH resource according to the occupancy signal.

[0019] According to a fifth aspect of the embodiments of the present disclosure, a communication device is provided, including a processor, a transceiver, a memory, and an executable program stored in the memory and capable of running on the processor. When the processor runs the executable program, it executes the steps of the information transmission method described in the first aspect.

[0020] According to a sixth aspect of the embodiments of the present disclosure, a communication device is provided, including a processor, a transceiver, a memory, and an executable program stored in the memory and executable by the processor. When the processor runs the executable program, it executes the steps of the information transmission method described in the second aspect.

[0021] For the information transmission method, device, and communication device provided by the embodiments of the present disclosure, when the UE detects, on the PDCCH resource in the unlicensed spectrum, a DCI sent by the base station for scheduling the PDSCH resource in the unlicensed spectrum, the UE sends an occupancy signal; wherein the occupancy signal is used to indicate the determined channel occupying the PDSCH resource. In this way, by the UE sending the occupancy signal, communication nodes such as external devices that detect the occupancy signal within the coverage range of the UE signal avoid the downlink transmission of the base station. This reduces the situation where the downlink transmission is interfered by hidden nodes due to the base station's inability to detect hidden nodes, improves the reliability of downlink transmission, and enhances the communication quality.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the embodiments of the present invention.

[0024] Figure 1 is a schematic diagram of interference between communication systems shown according to an exemplary embodiment;

[0025] Figure 2 is a schematic structural diagram of a wireless communication system shown according to an exemplary embodiment;

[0026] Figure 3 is a schematic diagram of a listening backoff timing shown according to an exemplary embodiment;

[0027] Figure 4a is a schematic diagram of the time-domain relationship between a PDCCH resource and a PDSCH shown according to an exemplary embodiment;

[0028] Figure 4b is another schematic diagram of the time-domain relationship between a PDCCH resource and a PDSCH shown according to an exemplary embodiment;

[0029] Figure 4c is yet another schematic diagram of the time-domain relationship between a PDCCH resource and a PDSCH shown according to an exemplary embodiment;

[0030] Figure 4dIt is a schematic diagram showing yet another PDCCH resource and PDSCH time domain relationship according to an exemplary embodiment;

[0031] Figure 5 It is a schematic flowchart of a method for information transmission according to an exemplary embodiment;

[0032] Figure 6a It is a schematic diagram showing a time interval and time window position according to an exemplary embodiment;

[0033] Figure 6b It is a schematic diagram showing another time interval and time window position according to an exemplary embodiment;

[0034] Figure 7 It is a schematic flowchart of another method for information transmission according to an exemplary embodiment;

[0035] Figure 8 It is a block diagram of a device for information transmission according to an exemplary embodiment;

[0036] Figure 9 It is a block diagram of another device for information transmission according to an exemplary embodiment;

[0037] Figure 10 It is a block diagram of a device for information transmission according to an exemplary embodiment. Detailed implementation manners

[0038] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present invention. On the contrary, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present invention as detailed in the appended claims.

[0039] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present disclosure. The singular forms "a", "the", and "said" used in the embodiments of the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0040] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the embodiments of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0041] Please refer to Figure 2 , which shows a schematic structural diagram of a wireless communication system provided by the embodiments of the present disclosure. As Figure 2 shown, the wireless communication system is a communication system based on cellular mobile communication technology, and the wireless communication system may include: a plurality of terminals 11 and a plurality of base stations 12.

[0042] Among them, the terminal 11 may be a device that provides voice and / or data connectivity to a user. The terminal 11 may communicate with one or more core networks via a Radio Access Network (RAN). The terminal 11 may be an Internet of Things (IoT) terminal, such as a sensor device, a mobile phone (or referred to as a "cellular" phone), and a computer with an IoT terminal. For example, it may be a fixed, portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted device. For example, a Station (STA), a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point, a remote terminal, an access terminal, a user device, a user agent, a user equipment, or a user terminal (UE). Or, the terminal 11 may also be a device of an unmanned aerial vehicle. Or, the terminal 11 may also be a vehicle-mounted device. For example, it may be an in-vehicle computer with wireless communication function, or a wireless communication device external to the in-vehicle computer. Or, the terminal 11 may also be a roadside device. For example, it may be a street lamp, a signal lamp, or other roadside devices with wireless communication function.

[0043] The base station 12 may be a network-side device in a wireless communication system. Among them, the wireless communication system may be a fourth-generation mobile communication technology (4G) system, also known as a Long Term Evolution (LTE) system; or, the wireless communication system may also be a 5G system, also known as a new radio (NR) system or a 5G NR system. Or, the wireless communication system may also be the next generation system of the 5G system. Among them, the access network in the 5G system may be called NG-RAN (New Generation-Radio Access Network, new generation wireless access network). Or, an MTC system.

[0044] Among them, the base station 12 may be an evolved Node B (eNB) adopted in the 4G system. Or, the base station 12 may also be a gNB (gNode B) with a centralized distributed architecture adopted in the 5G system. When the base station 12 adopts a centralized distributed architecture, it usually includes a central unit (CU) and at least two distributed units (DUs). The protocol stacks of the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Media Access Control (MAC) layer are set in the central unit; the protocol stack of the Physical (PHY) layer is set in the distributed unit. The specific implementation manner of the base station 12 is not limited in the embodiments of the present disclosure.

[0045] A wireless connection may be established between the base station 12 and the terminal 11 through a wireless air interface. In different embodiments, the wireless air interface is a wireless air interface based on the fourth-generation mobile communication network technology (4G) standard; or, the wireless air interface is a wireless air interface based on the fifth-generation mobile communication network technology (5G) standard, such as the new radio; or, the wireless air interface may also be a wireless air interface based on the next generation mobile communication network technology standard of 5G.

[0046] In some embodiments, an E2E (End to End) connection can also be established between terminals 11. For example, in scenarios such as V2V (vehicle to vehicle), V2I (vehicle to Infrastructure), and V2P (vehicle to pedestrian) communications in vehicle-to-everything (V2X) communications.

[0047] In some embodiments, the above wireless communication system may further include a network management device 13.

[0048] A plurality of base stations 12 are respectively connected to the network management device 13. Among them, the network management device 13 may be a core network device in the wireless communication system. For example, the network management device 13 may be a Mobility Management Entity (MME) in an Evolved Packet Core (EPC). Alternatively, the network management device may also be other core network devices, such as a Serving GateWay (SGW), a Public Data Network GateWay (PGW), a Policy and Charging Rules Function (PCRF), or a Home Subscriber Server (HSS), etc. The implementation form of the network management device 13 is not limited in the embodiments of the present disclosure.

[0049] The execution subjects involved in the embodiments of the present disclosure include, but are not limited to: user equipment (UE, User Equipment) such as terminals supporting NR-U, and base stations for cellular mobile communications, etc.

[0050] The application scenario of the embodiments of the present disclosure is a Request To Send (RTS) / Clear To Send (CTS) mechanism for solving the hidden node problem. The sender and the receiver perform a handshake by exchanging RTS frames and CTS frames, and clear the channels around the sender and the receiver before completing data transmission and corresponding feedback through the time fields included in the RTS and CTS. As Figure 3As shown, after the sending end senses that the carrier channel is idle and backs off for a Distributed Coordination Function Inter Frame Space (DIFS) time, it sends an RTS frame to the receiving end. Nodes around the sending end that sense the RTS frame back off according to the Network Allocation Vector (NAV) time indicated in the RTS frame. The NAV time in the RTS frame includes the total time required for subsequent sending and feedback processes. After receiving the RTS frame, the receiving end sends a CTS frame to the sending end after a 16 us Short Inter Frame Space (SIFS). Other nodes that sense the CTS frame back off according to the indicated NAV time. The NAV time in the CTS frame includes the time from the end of the CTS to the completion of data sending and a corresponding Acknowledge (ACK) feedback.

[0051] In another way, a new air interface signal, the Channel Usage Indication (CUI) signal, can be introduced to replace the above RTS / CTS signals. After the sending end occupies the channel through the LBT process, it sends a Channel Usage Indication for Transmission (CUI-T) signal to the receiving end, which is used to indicate that it will occupy the channel as the sending end in the subsequent data transmission process. After receiving the CUI-T signal, the receiving end sends a Channel Usage Indication for Reception (CUI-R) signal, which is used to indicate that it will occupy the channel as the receiving end in the subsequent data transmission process. If other nodes around that want to send data sense the CUI-T signal, they do not back off; if other nodes around that want to send data sense the CUI-R signal, they back off.

[0052] In the New Radio (NR) system of the 5th Generation (5G) cellular mobile communication system, the way the base station schedules downlink data transmission for a certain UE is that the base station transmits the DCI for scheduling this UE using PDCCH resources, such as th Figures 4a to 4dAs shown, the PDSCH resources scheduled by the DCI can have a certain time interval from the PDCCH resources, can be adjacent to them, or can also have the same starting position as the PDCCH resources, and can even start earlier than the starting position of the PDCCH resources. The UE will always maintain the downlink listening state. The UE will first attempt blind detection of the DCI. After correctly demodulating its own DCI, according to the scheduled PDSCH resource position, modulation method, beam indication, etc. indicated in the DCI, it will receive and demodulate the corresponding PDSCH downlink data.

[0053] When transmitting downlink data PDSCH on unlicensed spectrum, if a mechanism similar to RTS / CTS is introduced, the hidden node problem can be avoided. If the RTS / CTS mechanism is introduced, since the transceiver needs to send RTS / CTS back and forth for each downlink transmission, a relatively large overhead will be generated.

[0054] As Figure 5 shown, this exemplary embodiment provides an information transmission method, which is applied to a terminal such as a UE in a communication system. The information transmission method may include:

[0055] Step 501: In response to detecting, on the PDCCH resources of the unlicensed spectrum, a DCI sent by the base station to the UE for scheduling PDSCH resources on the unlicensed spectrum, send an occupancy signal;

[0056] Among them, the occupancy signal is used to indicate the channel for determining the occupancy of the PDSCH resources.

[0057] Here, the communication system may be a cellular mobile communication system. The communication system can use unlicensed spectrum to achieve data transmission. This communication system can be referred to as the present communication system. There may also be an external communication system on the unlicensed spectrum. The external communication system may be a cellular mobile communication system different from the present communication system or other types of communication systems. The external communication system and the present communication system share the unlicensed spectrum. For example, the present communication system and the external communication system may be cellular mobile communication systems of different operators; or, the external communication system may be a Wi-Fi communication system, etc.

[0058] When the base station or the UE uses the unlicensed spectrum, it occupies the LBT frequency band as the occupancy frequency band unit. The LBT frequency band may be 20 MHz.

[0059] On the unlicensed frequency band, the base station uses PDCCH resources to transmit DCI. The PDCCH resources can occupy one or more LBT frequency bands. Before transmitting the DCI, the base station or the UE can perform CCA on one or more LBT frequency bands occupied by the PDCCH resources. When detecting that one or more LBT frequency bands occupied by the PDCCH resources are idle, use the PDCCH resources to send the DCI.

[0060] The UE can perform blind detection of DCI on the PDCCH. If DCI for scheduling PDSCH resources sent to the UE is detected, the UE needs to receive downlink data sent by the base station through the PDSCH resources.

[0061] The UE can send an occupancy signal. The occupancy signal can indicate to communication nodes such as external communication devices in an external communication system to determine the channel corresponding to the occupied PDSCH resources. External communication devices within the coverage range of the UE signal can determine that the channel corresponding to the PDSCH resources is occupied based on the occupancy signal, and then go silent on the channel corresponding to the PDSCH resources.

[0062] The occupancy signal can carry occupancy information to indicate the occupied channel. Alternatively, the external device can measure the occupancy signal and determine whether the channel is occupied based on the measurement result. For example, if the signal strength of the occupancy signal is greater than the strength threshold, the channel is considered occupied.

[0063] For the case where the occupancy signal carries occupancy information to indicate the occupied channel, the UE can broadcast the occupancy signal. The external device can determine that the channel is occupied based on the received occupancy signal.

[0064] For the external device to determine whether the channel is occupied by means of signal measurement, the UE can send an occupancy signal to the base station. The occupancy signal can simultaneously indicate to the base station that the channel is available for use and be used for CCA by other devices.

[0065] In this way, by the UE sending the occupancy signal, communication nodes such as external devices that detect the occupancy signal within the coverage range of the UE signal avoid the downlink transmission of the base station. The situation where the downlink transmission is interfered by hidden nodes due to the base station's inability to detect hidden nodes is reduced, the reliability of the downlink transmission is improved, and the communication quality is enhanced.

[0066] In one embodiment, there is a time interval between the PDCCH resources and the PDSCH resources; among them, the PDCCH resources are located before the PDSCH resources in the time domain;

[0067] Step 501 may include: sending an occupancy signal within a time window in the time interval.

[0068] A time interval needs to be set between the PDCCH resources carrying DCI and the PDSCH resources scheduled by the DCI, so that the UE can demodulate the DCI in the PDCCH resources and send an occupancy signal within the time interval.

[0069] In some other embodiments, the time window may be within the time interval. The UE can send an occupancy signal within the time window.

[0070] The base station can receive the occupancy signal within the time window.

[0071] The minimum value of the time interval can be determined according to the first minimum duration required for the UE to blindly detect and analyze the DCI, and the second minimum duration for transmitting the occupancy signal. The minimum value of the time interval can be greater than or equal to the sum of the first minimum duration and the second minimum duration. The time window can be greater than or equal to the second minimum duration.

[0072] By setting the time interval and the time window, time guarantee is provided for determining the PDSCH resources for the UE, so that the occupancy signal transmitted by the UE can indicate that the PDSCH resources are occupied. The indication accuracy of the occupancy signal is improved.

[0073] Exemplarily, the minimum value of the time interval can be N symbols. That is, the scheduling of the PDSCH resources must be after N symbols at the end position of the PDCCH resources. When the base station indicates the time domain position of the scheduled PDSCH resources in the DCI, it is necessary to ensure that the starting time domain position of the scheduled PDSCH resources is after N symbols at the end position of the PDCCH resources. The value of N can be any positive integer. For example, the value of N can be 2, 3, or 4, etc.

[0074] In one embodiment, the information transmission method may further include:

[0075] Obtain the minimum value of the time interval and / or the time window specified by the communication protocol or indicated by the base station.

[0076] The minimum value of the time interval and / or the time window can be specified by the communication protocol.

[0077] The minimum value of the time interval and / or the time window can also be indicated by the base station through downlink signaling. For example, the base station can configure the minimum value of the time interval and / or the time window through RRC layer signaling.

[0078] The minimum value of the time interval that can be configured by RRC or specified by the communication protocol. When the DCI schedules the PDSCH, the time interval between the DCI and the PDSCH can be greater than or equal to this minimum value.

[0079] In one embodiment, transmitting the occupancy signal in the time window within the time interval includes one of the following:

[0080] Transmit the occupancy signal within the first number of symbols after the PDCCH resources;

[0081] Transmit the occupancy signal within the second number of symbols before the PDSCH resources.

[0082] Exemplarily, as Figure 6a shown, it can be agreed by the protocol that the time window for the UE to transmit the CTS is the period within 2 time domain symbols before the starting time domain position of the PDSCH. AsFigure 6b As shown, it is also possible to configure, through RRC layer signaling, the time window for the UE to send CTS within a period of 3 time domain symbols at the end position of the PDCCH.

[0083] Exemplarily, if CCA for the channel of the PDSCH resource is not performed, the occupancy signal can be sent within the first number of symbols after the PDCCH resource. In this way, the channel of the PDSCH resource can be occupied for the first time, improving the timeliness of occupying the channel of the PDSCH resource.

[0084] If CCA for the channel of the PDSCH resource is required, the occupancy signal can be sent within the second number of symbols before the PDSCH resource. In this way, time for CCA can be reserved after the PDCCH resource.

[0085] In one embodiment, step 501 may include:

[0086] Send an occupancy signal within the listen-before-talk LBT frequency band to which the PDSCH resource belongs.

[0087] When the base station or the UE uses the unlicensed spectrum, the LBT frequency band is used as the occupancy frequency band unit for occupancy. The LBT frequency band can be 20 MHz.

[0088] On the unlicensed frequency band, the base station uses the PDSCH resource to transmit downlink. The PDSCH resource can occupy one or more LBT frequency bands.

[0089] The UE can send an occupancy signal on one or more LBT frequency bands that the PDSCH resource can occupy, so that the occupancy signal can cover the LBT frequency bands that the PDSCH resource needs to occupy.

[0090] Exemplarily, in the 5 GHz frequency band, the LBT frequency band is 20 MHz. After receiving the DCI, the UE can know the time domain and frequency domain positions of the PDSCH resource by demodulating the DCI. The frequency domain position of the PDSCH resource may be only in one LBT frequency band or may span multiple LBT frequency bands. The LBT frequency band where the occupancy signal is located should be the same as the position of the LBT frequency band where the PDSCH is located. For example, if the UE determines, by demodulating the DCI, that the frequency domain position of the PDSCH resource is on LBT frequency band 0 and LBT frequency band 1, then the UE can send occupancy signals on both LBT frequency band 0 and LBT frequency band 1.

[0091] In this way, an occupancy signal is sent within the LBT band to which the PDSCH resource belongs, so that communication nodes within the coverage range of the UE signal avoid the LBT band to which the PDSCH resource of the base station belongs. The situation where the LBT band to which the PDSCH resource belongs is interfered by hidden nodes due to the base station's inability to detect hidden nodes is reduced, the downlink transmission reliability is improved, and the communication quality is enhanced.

[0092] In one embodiment, sending an occupancy signal within the LBT band to which the PDSCH resource belongs includes one of the following:

[0093] Using one or more interleaved resource blocks within the LBT band to send the occupancy signal; wherein, the interleaved resource block includes: one or more resource blocks RB;

[0094] Using one or more resource blocks RB within the LBT band to send the occupancy signal.

[0095] Here, the LBT band to which the PDSCH resource belongs includes one or more LBT bands.

[0096] The LBT band can be divided into multiple RBs, and multiple RBs are allocated to multiple interleaved resource blocks. The interleaved resource block includes: one or more resource blocks RB. Each interleaved resource block is different, and the interleaved resource blocks fill the entire LBT band in a comb form.

[0097] Exemplarily, the interlaced resource allocation can divide a 20MHZ LBT band into 10 or 5 combed interleaved resource blocks. Among them, when divided into 10 interleaved resource blocks, the subcarrier bandwidth is 15KHz; when divided into 5 interleaved resource blocks, the subcarrier bandwidth is 30KHz.

[0098] For example, at 15KHz subcarrier, the 20MHz LBT band contains 106 RBs, indexed from 0 to 105. The 106 RBs can be divided into 10 interleaved resource blocks, indexed from 0 to 9. Each interleaved resource block contains 10 or 11 RBs. Interleaved resource block 0 contains RBs 0 / 10 / 20 / 30 / 40 / 50 / 60 / 70 / 80 / 90 / 100, a total of 11, and interleaved resource block 6 contains RBs 6 / 16 / 26 / 36 / 46 / 56 / 66 / 76 / 86 / 96, a total of 10. Each interleaving fills the entire LBT band in a comb form.

[0099] The UE can use one or more interleaved resource blocks to transmit the occupancy signal. The base station can receive the occupancy signal using one or more interleaved resource blocks. Among them, the UE can use interleaved resource blocks with the same serial number on multiple LBT bands to send the occupancy signal.

[0100] Exemplarily, the base station may semi-statically allocate a certain interleaved resource block to the UE as the frequency resource for transmitting the occupancy signal in a certain LBT band. For example, the base station allocates the interleaved resource block 3 to the UE as the frequency domain resource for transmitting the occupancy signal. When the UE needs to transmit the occupancy signal on both the LBT band 0 and the LBT band 1, the UE transmits the occupancy signal on the interleaved resource block 3 in the LBT band 0 and the interleaved resource block 3 in the LBT band 1.

[0101] External devices, etc. can determine the occupancy situation of the LBT band according to the occupancy signals transmitted on one or more interleaved resource blocks.

[0102] In this way, by using the interleaved resource block to transmit the occupancy signal, on the one hand, the coverage rate of the occupancy signal in the LBT band can be improved, the detectability of the occupancy signal can be improved, and the detection efficiency of the occupancy signal can be improved. On the other hand, it can meet the regulatory requirements for transmitting data on the unlicensed frequency band, that is, it is required that the signal transmitted by the transmitting end occupies a predetermined proportion of the communication channel, such as occupying 80% of the communication channel.

[0103] The UE can also use a continuous frequency resource for transmitting the occupancy signal. For example, the UE can use a continuous number of RBs on the LBT band to transmit the occupancy signal. The RBs used for transmitting the occupancy signal can be configured by the base station, such as being configured through RRC signaling, etc.

[0104] Exemplarily, the base station allocates the 10th - 11th RBs to the UE for transmitting the occupancy signal. When the UE needs to transmit the occupancy signal on both the LBT band 0 and the LBT band 1, the UE transmits the occupancy signal on the 10th - 11th RBs in the LBT band 0 and the 10th - 11th RBs in the LBT band 1.

[0105] In one embodiment, the occupancy signal is used to indicate the determination of occupying the LBT band.

[0106] The occupancy signal transmitted within the LBT band to which the PDSCH resource belongs can indicate occupying the LBT band to which the PDSCH resource belongs.

[0107] The occupancy signal may carry occupancy information for indicating the occupied channel. Or the occupancy signal may use signal coding to indicate the occupied channel. Or, the external device can measure the occupancy signal and determine whether the channel is occupied according to the measurement result.

[0108] Exemplarily, the external device detects an occupancy signal detected on the LBT band 0. If the signal strength of the occupancy signal is greater than the strength threshold, it is considered that the LBT band 0 is occupied.

[0109] In one embodiment, step 501 may include:

[0110] Perform an idle channel detection on the LBT band to which the PDSCH resource belongs, and send an occupancy signal in response to the LBT band being idle.

[0111] Before sending the occupancy signal, the UE may or may not perform an idle channel detection.

[0112] The UE may perform a channel CCA before sending the occupancy signal. If the interference of other signals in the channel is detected to be less than the threshold value, the occupancy signal is sent. If the UE performs an idle channel detection, the base station will only use the PDSCH resource to transmit downlink data after receiving the occupancy signal sent by the UE, otherwise it will not transmit downlink data.

[0113] In this way, performing an idle channel detection and sending an occupancy signal after determining that the channel is idle can reduce the mutual interference between the sent occupancy signal and the signals currently sent by other communication devices in the LBT band to which the PDSCH resource belongs. Ensure that the interference received by the PDSCH resource is within an acceptable range for data transmission, and improve the transmission quality of downlink data.

[0114] In one embodiment, the occupancy signal is further used to indicate that the base station is allowed to use the PDSCH resource to transmit downlink data.

[0115] The occupancy signal may be a Clear To Send (CTS) signal sent to the base station in response to DCI. The occupancy signal may indicate that the base station is allowed to use the PDSCH resource to transmit downlink data, and inform other devices outside the base station that the channel corresponding to the PDSCH resource is occupied.

[0116] After receiving the occupancy signal, the base station may use the PDSCH resource indicated by DCI to transmit downlink data.

[0117] In one embodiment, step 501 may include: sending an occupancy signal carrying the identification information of the UE;

[0118] Among them, the identification information of the UE is used by the base station to determine the UE that sends the occupancy signal.

[0119] The occupancy signal sent by the UE can carry the identification information of this UE, which is used by the base station to determine which UE sent the occupancy signal it received.

[0120] After the base station determines the UE according to the identification information, it uses the PDSCH resource to send downlink data to the UE.

[0121] By setting the identification information, the base station can identify the UE that sends the occupancy signal and send the downlink data belonging to the UE to the UE. Reduce the situation of sending downlink data to the wrong UE.

[0122] As shown Figure 7 in the following, this exemplary embodiment provides an information transmission method, which is applied to a base station in a communication system. The information transmission method may include:

[0123] Step 701: Use the PDCCH resources in the unlicensed spectrum to send DCI for scheduling the PDSCH resources in the unlicensed spectrum to the UE;

[0124] Step 702: Receive the occupancy signal sent by the UE in response to the DCI. The occupancy signal is also used to indicate the determination of the channel corresponding to the occupied PDSCH resources;

[0125] Step 703: Transmit downlink data on the PDSCH resources according to the occupancy signal.

[0126] Here, the communication system may be a cellular mobile communication system. The communication system may use the unlicensed spectrum to achieve data transmission. This communication system may be referred to as this communication system. There may also be an external communication system on the unlicensed spectrum. The external communication system may be a cellular mobile communication system different from this communication system or other types of communication systems. The external communication system and this communication system share the unlicensed spectrum. For example, this communication system and the external communication system may be cellular mobile communication systems of different operators; or, the external communication system may be a Wi-Fi communication system, etc.

[0127] When the base station or the UE uses the unlicensed spectrum, it takes the LBT band as the occupancy band unit for occupancy. The LBT band may be 20 MHz.

[0128] On the unlicensed frequency band, the base station uses the PDCCH resources to transmit DCI. The PDCCH resources may occupy one or more LBT bands. Before transmitting the DCI, the base station or the UE may perform CCA on one or more LBT bands occupied by the PDCCH resources. When it is detected that one or more LBT bands occupied by the PDCCH resources are idle, the PDCCH resources are used to send DCI.

[0129] The UE may perform DCI blind detection on the PDCCH. If it is detected that there is DCI sent to the UE for scheduling the PDSCH resources, the UE needs to receive the downlink data sent by the base station through the PDSCH resources.

[0130] The occupancy signal may be a Clear To Send (CTS) signal sent to the base station in response to the DCI. The occupancy signal may indicate that the base station is allowed to use the PDSCH resources to transmit downlink data and inform other devices outside the base station that the channel corresponding to the PDSCH resources is occupied.

[0131] After the base station receives the occupancy signal, it can transmit downlink data using the PDSCH resources indicated by DCI.

[0132] The UE can send an occupancy signal. The occupancy signal can indicate to communication nodes such as external communication devices in an external communication system to determine the channel corresponding to the occupied PDSCH resources. External communication devices within the coverage of the UE signal can determine that the channel corresponding to the PDSCH resources is occupied based on the occupancy signal, and then go silent on the channel corresponding to the PDSCH resources.

[0133] The occupancy signal can carry occupancy information to indicate the occupied channel. Alternatively, the external device can measure the occupancy signal and determine whether the channel is occupied according to the measurement result. For example, if the signal strength of the occupancy signal is greater than the strength threshold, it is considered that the channel is occupied.

[0134] For the case where the occupancy signal carries occupancy information to indicate the occupied channel, the UE can broadcast the occupancy signal. The external device can determine that the channel is occupied based on the received occupancy signal.

[0135] For the external device to determine whether the channel is occupied by means of signal measurement, the UE can send an occupancy signal to the base station. The occupancy signal can simultaneously indicate to the base station that the channel is available and be used for other devices to perform CCA.

[0136] In this way, by the UE sending the occupancy signal, communication nodes such as external devices that detect the occupancy signal within the coverage of the UE signal avoid the downlink transmission of the base station. It reduces the situation where the downlink transmission is interfered by hidden nodes due to the base station's inability to detect hidden nodes, improves the reliability of the downlink transmission, and enhances the communication quality.

[0137] In one embodiment, there is a time interval between the PDCCH resources and the PDSCH resources; among them, the PDCCH resources are located before the PDSCH resources in the time domain;

[0138] Step 702 may include:

[0139] Receive the occupancy signal within the time window in the time interval.

[0140] A time interval needs to be set between the PDCCH resources carrying DCI and the PDSCH resources scheduled by DCI, so that the UE can demodulate DCI in the PDCCH resources and send the occupancy signal within the time interval.

[0141] In some other embodiments, the time window can be within the time interval. The UE can send the occupancy signal within the time window.

[0142] The base station can receive the occupancy signal within the time window.

[0143] The minimum value of the time interval can be determined according to the first minimum duration required for the UE to blindly detect and parse the DCI, and the second minimum duration for transmitting the occupancy signal. The minimum value of the time interval can be greater than or equal to the sum of the first minimum duration and the second minimum duration. The time window can be greater than or equal to the second minimum duration.

[0144] By setting the time interval and the time window, time guarantee is provided for determining the PDSCH resources for the UE, so that the occupancy signal transmitted by the UE can indicate that the PDSCH resources are occupied. The indication accuracy of the occupancy signal is improved.

[0145] Exemplarily, the minimum value of the time interval can be N symbols. That is, the scheduling of the PDSCH resources must be after N symbols at the end position of the PDCCH resources. When the base station indicates the time domain position of the scheduled PDSCH resources in the DCI, it is necessary to ensure that the starting time domain position of the scheduled PDSCH resources is after N symbols at the end position of the PDCCH resources. The value of N can be any positive integer. For example, the value of N can be 2, 3, or 4, etc.

[0146] In one embodiment, the method further includes at least one of the following:

[0147] Obtain the minimum value of the time interval and / or the time window specified by the communication protocol;

[0148] Indicate the minimum value of the time interval and / or the time window to the UE.

[0149] The minimum value of the time interval and / or the time window can be specified by the communication protocol.

[0150] The minimum value of the time interval and / or the time window can also be indicated by the base station through downlink signaling. For example, the base station can configure the minimum value of the time interval and / or the time window through RRC layer signaling.

[0151] The minimum value of the time interval that can be configured by RRC or specified by the communication protocol. When the DCI schedules the PDSCH, the time interval between the DCI and the PDSCH can be greater than or equal to this minimum value

[0152] In one embodiment, receiving the occupancy signal within the time window in the time interval includes one of the following:

[0153] Receive the occupancy signal within the first number of symbols after the PDCCH resources;

[0154] Receive the occupancy signal within the second number of symbols before the PDSCH resources.

[0155] Exemplarily, such as Figure 6aAs shown, it can be agreed through a protocol that the time window for the UE to send the CTS is within 2 time domain symbols before the starting time domain position of the PDSCH. For example, Figure 6b As shown, it can also be configured through RRC layer signaling that the time window for the UE to send the CTS is within 3 time domain symbols at the end position of the PDCCH.

[0156] Exemplarily, if CCA for the channel of the PDSCH resource is not performed, the occupancy signal can be sent within the first number of symbols after the PDCCH resource. In this way, the channel of the PDSCH resource can be occupied for the first time, improving the timeliness of occupying the channel of the PDSCH resource.

[0157] If CCA for the channel of the PDSCH resource is required, the occupancy signal can be sent within the second number of symbols before the PDSCH resource. In this way, time for CCA can be reserved after the PDCCH resource.

[0158] In one embodiment, step 702 may include:

[0159] Receive the occupancy signal in the listen-before-talk LBT frequency band to which the PDSCH resource belongs.

[0160] When the base station or the UE uses the unlicensed spectrum, the LBT frequency band is used as the occupancy frequency band unit for occupancy. The LBT frequency band can be 20 MHz.

[0161] On the unlicensed frequency band, the base station uses the PDSCH resource to transmit downlink. The PDSCH resource can occupy one or more LBT frequency bands.

[0162] The UE can send the occupancy signal on one or more LBT frequency bands that the PDSCH resource can occupy, so that the occupancy signal can cover the LBT frequency bands that the PDSCH resource needs to occupy.

[0163] Exemplarily, in the 5 GHz frequency band, the LBT frequency band is 20 MHz. After receiving the DCI, the UE can know the time domain and frequency domain positions of the PDSCH resource by demodulating the DCI. The frequency domain position of the PDSCH resource may be only in one LBT frequency band or may span multiple LBT frequency bands. The LBT frequency band where the occupancy signal is located should be the same as the LBT frequency band position where the PDSCH is located. For example, if the UE determines through demodulating the DCI that the frequency domain position of the PDSCH resource is on LBT frequency band 0 and LBT frequency band 1, then the UE can send the occupancy signal on both LBT frequency band 0 and LBT frequency band 1.

[0164] In this way, an occupancy signal is transmitted within the LBT band to which the PDSCH resource belongs, so that communication nodes within the coverage range of the UE signal avoid the LBT band to which the PDSCH resource of the base station belongs. This reduces the situation where the LBT band to which the PDSCH resource belongs is interfered by hidden nodes due to the base station's inability to detect hidden nodes, improves the reliability of downlink transmission, and enhances the communication quality.

[0165] In one embodiment, receiving an occupancy signal within the LBT band to which the PDSCH resource belongs includes one of the following:

[0166] Receiving an occupancy signal transmitted by the UE using one or more interleaved resource blocks within the LBT band, where the interleaved resource blocks include: one or more resource blocks RB;

[0167] Receiving an occupancy signal transmitted by the UE using one or more resource blocks RB within the LBT band.

[0168] Here, the LBT band to which the PDSCH resource belongs includes one or more LBT bands.

[0169] The LBT band can be divided into multiple RBs, and multiple RBs are allocated to multiple interleaved resource blocks. The interleaved resource blocks include: one or more resource blocks RB. Each interleaved resource block is different, and the interleaved resource blocks fill the entire LBT band in a comb form.

[0170] Exemplarily, the interlaced resource allocation can divide a 20MHZ LBT band into 10 or 5 interleaved resource blocks in a comb form. Among them, when divided into 10 interleaved resource blocks, the subcarrier bandwidth is 15KHz; when divided into 5 interleaved resource blocks, the subcarrier bandwidth is 30KHz.

[0171] For example, at 15KHz subcarriers, a 20MHz LBT band contains 106 RBs, indexed from 0 to 105. The 106 RBs can be divided into 10 interleaved resource blocks, indexed from 0 to 9. Each interleaved resource block contains 10 or 11 RBs. Interleaved resource block 0 contains RBs 0 / 10 / 20 / 30 / 40 / 50 / 60 / 70 / 80 / 90 / 100, a total of 11, and interleaved resource block 6 contains RBs 6 / 16 / 26 / 36 / 46 / 56 / 66 / 76 / 86 / 96, a total of 10. Each interleaving fills the entire LBT band in a comb form.

[0172] The UE may use the transmission occupancy signals of one or more interleaved resource blocks. The base station may receive the occupancy signals by using one or more interleaved resource blocks. Among them, the UE may use the interleaved resource blocks with the same serial number on multiple LBT frequency bands to send occupancy signals.

[0173] Exemplarily, the base station may semi-statically allocate a certain interleaved resource block to the UE as the frequency resource for sending the occupancy signal on a certain LBT frequency band. For example, the base station allocates interleaved resource block 3 to the UE as the frequency domain resource for sending the occupancy signal. When the UE needs to send occupancy signals on both LBT frequency band 0 and LBT frequency band 1, the UE sends occupancy signals on interleaved resource block 3 in LBT frequency band 0 and interleaved resource block 3 in LBT frequency band 1.

[0174] External devices, etc. may determine the occupancy situation of the LBT frequency band according to the transmission occupancy signals of one or more interleaved resource blocks.

[0175] In this way, by using interleaved resource blocks to transmit occupancy signals, on the one hand, the coverage rate of the occupancy signals in the LBT frequency band can be improved. The detectability of the occupancy signals is improved, and the detection efficiency of the occupancy signals is improved. On the other hand, the regulatory requirements for sending data on the unlicensed frequency band can be met, that is, it is required that the signals sent by the sending end should occupy a predetermined proportion of the communication channels, such as occupying 80% of the communication channels.

[0176] The UE may also use a continuous frequency resource for transmitting the occupancy signal. For example, the UE may use a continuous number of RBs on the LBT frequency band to send the occupancy signal. The RBs used for sending the occupancy signal may be configured by the base station. Such as configuring through RRC signaling, etc.

[0177] Exemplarily, the base station allocates RBs 10 - 11 to the UE for transmitting the occupancy signal. When the UE needs to send occupancy signals on both LBT frequency band 0 and LBT frequency band 1, the UE sends occupancy signals on the 10th - 11th RBs in LBT frequency band 0 and the 10th - 11th RBs in LBT frequency band 1.

[0178] In one embodiment, the occupancy signal is used to indicate the determination of occupying the LBT frequency band.

[0179] The occupancy signal sent within the LBT frequency band to which the PDSCH resource belongs may indicate occupying the LBT frequency band to which the PDSCH resource belongs.

[0180] The occupancy signal may carry occupancy information for indicating the occupied channel. Or the occupancy signal may use signal coding to indicate the occupied channel. Or, the external device may measure the occupancy signal and determine whether the channel is occupied according to the measurement result.

[0181] Exemplarily, an external device detects an occupancy signal on LBT band 0. If the signal strength of the occupancy signal is greater than the strength threshold, it is considered that LBT band 0 is occupied.

[0182] In one embodiment, the occupancy signal carries identification information;

[0183] The method further includes determining, according to the identification information, the UE that sends the occupancy signal.

[0184] The occupancy signal sent by the UE can carry the identification information of this UE, which is used for the base station to judge which UE the received occupancy signal is sent by.

[0185] After the base station determines the UE according to the identification information, it uses PDSCH resources to send downlink data to the UE.

[0186] By setting the identification information, the base station can identify the UE that sends the occupancy signal and send the downlink data belonging to the UE to the UE. The situation of sending downlink data to the wrong UE is reduced.

[0187] The following provides a specific example in combination with any of the above embodiments:

[0188] On the unlicensed band, the UE can perform DCI blind detection on the PDCCH. If it detects DCI for scheduling PDSCH resources sent to the UE, the UE will send an occupancy signal, such as sending a CTS signal to the base station. After receiving the CTS signal, the base station sends downlink data through the PDSCH resources.

[0189] A minimum time interval needs to be specified between the PDCCH resources where the DCI is located and the scheduled PDSCH resources, so that the UE can perform PDCCH demodulation and CTS transmission within this interval. This minimum time interval can be configured by the RRC layer signaling of the base station or directly agreed in the protocol.

[0190] A time window for the UE to send the CTS can also be defined. The time window should be within the above time interval. The UE should send the CTS within this time window, and the base station also expects to receive the CTS signal within this time window. This time window for sending the CTS can also be configured by RRC or agreed in the protocol.

[0191] The UE does not need to perform channel CCA detection before sending the CTS and can send the CTS after receiving its own DCI. It can also perform channel CCA detection before sending the CTS and send the CTS only if the detected channel interference is less than the threshold value. In the second case, the base station will send the PDSCH only after receiving the CTS signal sent by the UE, otherwise it will not send the PDSCH.

[0192] The CTS signal sent by the UE can carry the identifier of this UE, which is used by the base station to determine which UE sent the CTS signal it received. Other neighboring nodes can overhear the CTS signal sent by this UE and thus perform backoff.

[0193] For example, the minimum time interval between the PDCCH resource and the PDSCH resource is configured through RRC to be 4 time-domain symbols. That is to say, the scheduling of the PDSCH resource must be 4 symbols after the end position of the PDCCH resource. When the base station indicates the time-domain position of the scheduled PDSCH resource in the DCI, it is necessary to ensure that the starting time-domain position of the scheduled PDSCH resource is 4 symbols after the end position of the PDCCH resource.

[0194] As Figure 6a shown, it can be agreed through the protocol that the time window for the UE to send CTS is within the period of 2 time-domain symbols before the starting time-domain position of the PDSCH. As Figure 6b . shown, it can also be configured through RRC layer signaling that the time window for the UE to send CTS is within the period of 3 time-domain symbols at the end position of the PDCCH.

[0195] Frequency-domain position of the CTS signal:

[0196] In the unlicensed spectrum, channel monitoring is performed in units of LBT bands. For example, in the 5 GHz band, the LBT band is 20 MHz. After receiving the DCI, the UE can know the time-domain and frequency-domain positions of the PDSCH resource by demodulating the DCI. The frequency-domain position of the PDSCH resource may be in only one LBT band or may span multiple LBT bands. The LBT band where the CTS is located should be the same as the LBT band position where the PDSCH resource is located.

[0197] For example, if the UE determines through demodulating the DCI that the frequency-domain position of the PDSCH resource is on LBT band 0 and LBT band 1, then the UE should send CTS signals on both LBT band 0 and LBT band 1.

[0198] The base station can semi-statically allocate an interlace resource block to the UE as the frequency resource for sending CTS in a certain LBT band. For example, the base station allocates interlace resource block 3 to the UE as the frequency-domain resource for sending CTS. When the UE needs to send CTS signals on both LBT band 0 and LBT band 1, the UE sends CTS signals on interlace resource block 3 in LBT band 0 and interlace resource block 3 in LBT band 1.

[0199] The interlaced resource allocation can divide a 20MHZ LBT frequency band into 10 or 5 interleaved resource blocks for grooming. Among them, when divided into 10 interleaved resource blocks, the subcarrier bandwidth is 15KHz; when divided into 5 interleaved resource blocks, the subcarrier bandwidth is 30KHz.

[0200] For example, at 15KHz subcarriers, the 20MHz LBT frequency band contains 106 RBs, indexed from 0 to 105. The 106 RBs can be divided into 10 interleaved resource blocks, indexed from 0 to 9, and each interleaved resource block contains 10 or 11 RBs. Interleaved resource block 0 contains RBs 0 / 10 / 20 / 30 / 40 / 50 / 60 / 70 / 80 / 90 / 100, a total of 11, and interleaved resource block 6 contains RBs 6 / 16 / 26 / 36 / 46 / 56 / 66 / 76 / 86 / 96, a total of 10. Each interleaving fills the entire LBT frequency band in a grooming form.

[0201] The UE can use the transmission of one or more interleaved resource blocks to occupy the signal. The base station can use one or more interleaved resource blocks to receive the occupied signal. Among them, the UE can use the interleaved resource blocks with the same serial number on multiple LBT frequency bands to send the occupied signal.

[0202] Exemplarily, the base station can semi-statically allocate a certain interleaved resource block to the UE as the frequency resource for sending the occupied signal in a certain LBT frequency band. For example, the base station allocates interleaved resource block 3 to the UE as the frequency domain resource for sending the occupied signal. When the UE needs to send the occupied signal on both LBT frequency band 0 and LBT frequency band 1, the UE sends the occupied signal on interleaved resource block 3 in LBT frequency band 0 and interleaved resource block 3 in LBT frequency band 1.

[0203] External devices, etc. can determine the occupancy of the LBT frequency band based on the transmission of one or more interleaved resource blocks to occupy the signal.

[0204] In this way, by using the interleaved resource block to transmit the occupied signal, on the one hand, the coverage rate of the occupied signal in the LBT frequency band can be improved. The detectability of the occupied signal is improved, and the detection efficiency of the occupied signal is improved. On the other hand, it can meet the regulatory requirements for sending data on the unlicensed frequency band, that is, the signal sent by the sending end is required to occupy a predetermined proportion of the communication channel, such as occupying 80% of the communication channel.

[0205] If the interleaved resource allocation method is not required, the base station can semi-statically allocate a continuous frequency resource to the UE for transmitting the CTS. For example, the 10th to 11th RBs on the LBT frequency band are allocated to the UE for sending the CTS. When the UE needs to send CTS signals on both LBT frequency band 0 and LBT frequency band 1, the UE sends CTS signals on the 10th to 11th RBs in LBT frequency band 0 and the 10th to 11th RBs in LBT frequency band 1.

[0206] An embodiment of the present invention further provides an information transmission device, which is applied to a UE such as a terminal in the communication system. Figure 8 It is a schematic structural diagram of the information transmission device 100 provided by an embodiment of the present invention; as Figure 8 shown, the device 100 includes: a first transmission module 110, wherein,

[0207] The first transmission module 110 is configured to send an occupancy signal in response to detecting, on the PDCCH resource in the unlicensed spectrum, a DCI sent by the base station to the UE for scheduling the PDSCH resource in the unlicensed spectrum;

[0208] Wherein, the occupancy signal is used to indicate the channel for determining the occupancy of the PDSCH resource.

[0209] In one embodiment, there is a time interval between the PDCCH resource and the PDSCH resource; wherein, the PDCCH resource is located before the PDSCH resource in the time domain;

[0210] The first transmission module 110 includes:

[0211] The first transmission sub-module 111 is configured to send an occupancy signal within a time window in the time interval.

[0212] In one embodiment, the device further includes:

[0213] The first acquisition module 120 is configured to acquire the minimum value and / or the time window of the time interval specified by the communication protocol or indicated by the base station.

[0214] In one embodiment, the first transmission sub-module 111 includes one of the following:

[0215] The first transmission unit 1111 is configured to send an occupancy signal within the first number of symbols after the PDCCH resource;

[0216] The second transmission unit 1112 is configured to send an occupancy signal within the second number of symbols before the PDSCH resource.

[0217] In one embodiment, the first transmission module 110 includes:

[0218] The second transmitting sub-module 112 is configured to transmit an occupancy signal within the listen-before-talk (LBT) band to which the PDSCH resource belongs.

[0219] In one embodiment, the occupancy signal is used to indicate the determination of occupying the LBT band.

[0220] In one embodiment,

[0221] The second transmitting sub-module 112 includes one of the following:

[0222] The third transmitting unit 1121 is configured to transmit the occupancy signal by using one or more interleaved resource blocks within the LBT band; wherein, the interleaved resource block includes: one or more resource blocks (RBs);

[0223] The fourth transmitting unit 1122 is configured to transmit the occupancy signal by using one or more resource blocks (RBs) within the LBT band.

[0224] In one embodiment, the first transmitting module 110 includes:

[0225] The third transmitting sub-module 113 is configured to perform an idle channel detection on the LBT band to which the PDSCH resource belongs, and in response to the LBT band being idle, transmit the occupancy signal.

[0226] In one embodiment, the occupancy signal is further used to indicate that the base station is allowed to use the PDSCH resource to transmit downlink data.

[0227] In one embodiment, the first transmitting module 110 includes:

[0228] The fourth transmitting sub-module 114 is configured to transmit an occupancy signal carrying the identification information of the UE;

[0229] wherein, the identification information of the UE is used for the base station to determine the UE that transmits the occupancy signal.

[0230] An embodiment of the present invention further provides an information transmission device, which is applied to the base station in the present communication system. Figure 9 It is a schematic structural diagram of the information transmission device 200 provided by the embodiment of the present invention; as Figure 9 shown, the device 200 includes: a second transmitting module 210, a first receiving module 220, and a transmission module 230, wherein,

[0231] The second transmitting module 210 is configured to use the PDCCH resource in the unlicensed spectrum for the second time to send DCI for scheduling the PDSCH resource on the unlicensed spectrum to the UE.

[0232] A first receiving module 220, configured to receive an occupancy signal sent by a UE in response to DCI, where the occupancy signal is further used to indicate determining a channel corresponding to an occupied PDSCH resource;

[0233] A transmission module 230, configured to transmit downlink data on a PDSCH resource according to the occupancy signal.

[0234] In one embodiment, there is a time interval between a PDCCH resource and a PDSCH resource; wherein, the PDCCH resource is located before the PDSCH resource in the time domain;

[0235] The first receiving module 220 includes:

[0236] A first receiving sub-module 221, configured to receive the occupancy signal within a time window in the time interval.

[0237] In one embodiment, the apparatus further includes at least one of the following:

[0238] A second obtaining module 240, configured to obtain a minimum value of the time interval and / or a time window specified by a communication protocol;

[0239] An indication module 250, configured to indicate the minimum value of the time interval and / or the time window to the UE.

[0240] In one embodiment, the first receiving sub-module 221 includes one of the following:

[0241] A first receiving unit 2211, configured to receive the occupancy signal within a first number of symbols after the PDCCH resource;

[0242] A second receiving unit 2212, configured to receive the occupancy signal within a second number of symbols before the PDSCH resource.

[0243] In one embodiment, the first receiving module 220 includes:

[0244] A second receiving sub-module 222, which receives the occupancy signal within a listen-before-talk (LBT) frequency band to which the PDSCH resource belongs.

[0245] In one embodiment, the occupancy signal is used to indicate determining an occupied LBT frequency band.

[0246] In one embodiment, the second receiving sub-module 222 includes one of the following:

[0247] A third receiving unit 2221, configured to receive the occupancy signal sent by the UE using one or more interleaved resource blocks within the LBT frequency band, where the interleaved resource block includes: one or more resource blocks (RBs);

[0248] A fourth receiving unit 2222, configured to receive an occupancy signal sent by a UE using one or more resource blocks (RBs) within the LBT frequency band.

[0249] In one embodiment, the occupancy signal carries identification information;

[0250] The apparatus 200 further includes:

[0251] A determination module 260, configured to determine the UE that sends the occupancy signal according to the identification information.

[0252] In an exemplary embodiment, the first transmission module 110, the first acquisition module 120, the second transmission module 210, the first receiving module 220, the transmission module 230, the second acquisition module 240, the indication module 250, and the determination module 260, etc. may be implemented by one or more central processing units (CPUs, Central Processing Unit), graphics processing units (GPUs, Graphics Processing Unit), baseband processors (BP, baseband processor), application specific integrated circuits (ASICs, Application Specific Integrated Circuit), DSPs, programmable logic devices (PLDs, Programmable Logic Device), complex programmable logic devices (CPLDs, Complex Programmable Logic Device), field programmable gate arrays (FPGAs, Field-Programmable Gate Array), general purpose processors, controllers, microcontroller units (MCUs, Micro Controller Unit), microprocessors (Microprocessor), or other electronic components, and may also be implemented in combination with one or more radio frequency (RF, radio frequency) antennas for performing the foregoing methods.

[0253] Figure 10 It is a block diagram of an apparatus 3000 for information transmission shown according to an exemplary embodiment. For example, the apparatus 3000 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0254] In an exemplary embodiment, the apparatus 3000 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above methods.

[0255] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 3004 including instructions, and the above instructions can be executed by a processor 3020 of the apparatus 3000 to implement the above method. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0256] Those skilled in the art will readily conceive of other embodiments of the embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the embodiments of the present invention, which follow the general principles of the embodiments of the present invention and include known common knowledge or conventional technical means in the technical field not disclosed in the embodiments of the present disclosure. The specification and the embodiments are only to be considered as exemplary, and the true scope and spirit of the embodiments of the present invention are pointed out by the following claims.

[0257] It should be understood that the embodiments of the present invention are not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the embodiments of the present invention is only limited by the appended claims.

Claims

1. An information transmission method, wherein, Applied to a user equipment (UE), the method includes: In response to detecting, on a physical downlink control channel (PDCCH) resource in an unlicensed spectrum, downlink control information (DCI) sent by a base station to the UE for scheduling a physical downlink shared channel (PDSCH) resource on the unlicensed spectrum, sending an occupancy signal; wherein, the occupancy signal is sent by the UE in a broadcast manner, and the occupancy signal is used to indicate to external communication devices within the signal coverage range of the UE the channel determined to occupy the PDSCH resource; The sending of the occupancy signal includes: sending the occupancy signal within a time window in a time interval; the PDCCH resource and the PDSCH resource have the time interval; wherein, the PDCCH resource is located before the PDSCH resource in the time domain.

2. The method according to claim 1, wherein The method further includes: Obtaining the minimum value and / or time window of the time interval specified by a communication protocol or indicated by the base station.

3. The method according to claim 2, wherein, The sending of the occupancy signal within the time window in the time interval includes one of the following: Sending the occupancy signal within a first number of symbols after the PDCCH resource; Sending the occupancy signal within a second number of symbols before the PDSCH resource.

4. The method according to claim 1, wherein, The sending of the occupancy signal includes: Sending the occupancy signal within the listen-before-talk (LBT) band to which the PDSCH resource belongs.

5. The method according to claim 4, wherein, The occupancy signal is used to indicate the determination of occupying the LBT band.

6. The method according to claim 4, wherein The sending of the occupancy signal within the LBT band to which the PDSCH resource belongs includes one of the following: Sending the occupancy signal using one or more interleaved resource blocks within the LBT band; wherein, the interleaved resource block includes: one or more resource blocks (RBs); Sending the occupancy signal using one or more resource blocks (RBs) within the LBT band.

7. The method according to any one of claims 4 to 6, wherein, The sending of the occupancy signal includes: Performing an idle channel detection on the LBT band to which the PDSCH resource belongs, and in response to the LBT band being idle, sending the occupancy signal.

8. The method according to any one of claims 1 to 6, wherein The occupancy signal is further used to indicate permission for the base station to transmit downlink data using the PDSCH resource.

9. The method according to any one of claims 1 to 6, wherein, The sending of the occupancy signal includes: Sending the occupancy signal carrying the identification information of the UE; wherein, the identification information of the UE is used for the base station to determine the UE that sends the occupancy signal.

10. A method for information transmission, wherein, Applied to a base station, the method includes: Using a physical downlink control channel (PDCCH) resource in an unlicensed spectrum to send DCI to a user equipment (UE) for scheduling a physical downlink shared channel (PDSCH) resource on the unlicensed spectrum; Receiving the occupancy signal sent by the UE in response to the downlink control information (DCI), wherein, the occupancy signal is sent by the UE in a broadcast manner, and the occupancy signal is further used to indicate to external communication devices within the signal coverage range of the UE the channel corresponding to the determined occupancy of the PDSCH resource; Transmitting downlink data on the PDSCH resource according to the occupancy signal; Receiving the occupancy signal sent by the UE in response to the downlink control information DCI includes: Receiving the occupancy signal within a time window in a time interval; the PDCCH resource and the PDSCH resource have the time interval; wherein, the PDCCH resource is located before the PDSCH resource in the time domain.

11. The method according to claim 10, wherein, The method further includes at least one of the following: Obtaining the minimum value of the time interval and / or the time window specified by the communication protocol; Indicating the minimum value of the time interval and / or the time window to the UE.

12. The method according to claim 10, wherein Receiving the occupancy signal within the time window in the time interval includes one of the following: Receiving the occupancy signal within a first number of symbols after the PDCCH resource; Receiving the occupancy signal within a second number of symbols before the PDSCH resource.

13. The method according to claim 10, wherein, Receiving the occupancy signal sent by the UE in response to the DCI includes: Receiving the occupancy signal within the listen-before-talk LBT frequency band to which the PDSCH resource belongs.

14. According to the method of claim 13, wherein, The occupancy signal is used to indicate the determination of occupying the LBT frequency band.

15. The method according to claim 13, wherein Receiving the occupancy signal within the LBT frequency band to which the PDSCH resource belongs includes one of the following: Receiving the occupancy signal sent by the UE using one or more interleaved resource blocks within the LBT frequency band, wherein the interleaved resource blocks include: one or more resource blocks RB; Receiving the occupancy signal sent by the UE using one or more resource blocks RB within the LBT frequency band.

16. The method according to any one of claims 10 to 15, wherein The occupancy signal carries identification information; The method further includes: determining the UE that sends the occupancy signal according to the identification information.

17. An information transmission device, wherein, Applied to a user equipment UE, the apparatus includes: a first sending module, wherein, The first sending module is configured to send an occupancy signal in response to detecting downlink control information DCI sent by a base station to the UE for scheduling a physical downlink shared channel PDSCH resource on an unlicensed spectrum on a physical downlink control channel PDCCH resource of the unlicensed spectrum; Wherein, the occupancy signal is sent by the UE in a broadcast manner, and the occupancy signal is used to indicate to an external communication device within the signal coverage range of the UE the determination of occupying the channel of the PDSCH resource; The first sending module includes: a first sending sub-module configured to send the occupancy signal within a time window in a time interval; the PDCCH resource and the PDSCH resource have the time interval; wherein, the PDCCH resource is located before the PDSCH resource in the time domain.

18. An information transmission device, wherein, Applied to a base station, the apparatus includes: a second sending module, a first receiving module, and a transmission module, wherein, The second sending module is configured to use a physical downlink control channel PDCCH resource of an unlicensed spectrum to send DCI to a user equipment UE for scheduling a physical downlink shared channel PDSCH resource on the unlicensed spectrum; The first receiving module is configured to receive the occupancy signal sent by the UE in response to the downlink control information DCI, where the occupancy signal is sent by the UE in a broadcast manner, and the occupancy signal is further used to indicate to an external communication device within the signal coverage range of the UE to determine to occupy the channel corresponding to the PDSCH resource; The transmission module is configured to transmit downlink data on the PDSCH resource according to the occupancy signal; The first receiving module includes: a first receiving sub-module configured to receive the occupancy signal within a time window in a time interval; the PDCCH resource and the PDSCH resource have the time interval; wherein the PDCCH resource is located before the PDSCH resource in the time domain.

19. A communication device, comprising a processor, a transceiver, a memory, and an executable program stored on the memory and capable of being run by the processor. When the processor runs the executable program, it executes the steps of the information transmission method according to any one of claims 1 to 9.

20. A communication device, comprising a processor, a transceiver, a memory, and an executable program stored on the memory and capable of being run by the processor. When the processor runs the executable program, it executes the steps of the information transmission method according to any one of claims 10 to 16.

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