CN115334672A

CN115334672A - Channel access method, device and storage medium for side-chain communication based on unauthorized frequency band

Info

Publication number: CN115334672A
Application number: CN202210964034.7A
Authority: CN
Inventors: 唐懿夫; 黄昕; 周楠清
Original assignee: Chengdu Airui Wireless Technology Co ltd
Current assignee: Chengdu Airui Wireless Technology Co ltd
Priority date: 2022-08-11
Filing date: 2022-08-11
Publication date: 2022-11-11

Abstract

The invention discloses a channel access method, a device and a storage medium for side-chain communication based on an unauthorized frequency band, wherein the method realizes the following steps: the side-chain communication user equipment sends the occupancy signal associated with the target resource before the target starting time indicated by the target resource through the side-chain communication user equipment or other user equipment, so that the other user equipment or other communication systems (such as WiFi) are ensured to fail in LBT detection and cannot occupy resources of an unauthorized frequency band, the LBT detection success rate of the side-chain communication user equipment is improved, the side-chain communication user equipment can be ensured to normally carry out side-chain communication at the moment of the selected unauthorized frequency band, and the channel access success rate of the side-chain communication user equipment is improved.

Description

Channel access method, device and storage medium for side-chain communication based on unauthorized frequency band

Technical Field

The invention relates to the technical field of communication, in particular to a channel access method, a device and a storage medium for side-chain communication based on an unauthorized frequency band.

Background

NR (New Radio, new air interface) sidelink communication refers to a technology in which end users (e.g., mobile phone users, or car-mounted devices, or D2D (Device-to-Device) devices, or IoT devices, or portable devices, etc.) communicate with each other without going through a base station. The 3gpp release17 standardizes the licensed band-based NR-SL (New Radio-SideLink) communication.

For resource scheduling of the sidelink communication, the NR sidelink communication supports two modes:

mode1 (mode 1): and the base station schedules resources required by the side chain communication for the users of the side chain communication.

Mode2 (mode 2): the user of the side-chain communication judges the available side-chain communication resources in the side-chain communication resource pool through Sensing (Sensing), so that the resources of the side-chain communication at this time and the resources for reserving the future communication are selected.

In addition, NR side chain communication also derives a new resource scheduling method. For example, a user in the sidelink communication can schedule the resource for the sidelink communication by other users. Or when the side-chain communication user selects a communication resource by using mode2, the auxiliary information provided by other users is acquired, and the auxiliary information comprises expected resources (expected resources) or unexpected resources (Non-expected resources) for resource selection.

The NR side chain communication comprises three communication modes of broadcasting, multicasting and unicasting. For multicast and unicast, the receiver of the sidelink communication sends HARQ feedback depending on whether the feedback process is activated or not.

Standardization of a channel access procedure and method for NR-U (New Radio-unlicensed spectrum) is completed in 3GPP protocol TS 37.213. For fair use of unlicensed spectrum, channel access determines the idle-busy state of a channel mainly through a Listen-Before-Talk (LBT) technique. A communication node (including a base station and an end user) needs to confirm that a channel is in an idle state through LBT, and then can access the channel to use resources of an unlicensed frequency band.

Downlink transmission in NR-U defines two channel access methods: type1 and Type2.Type1 is downlink transmission initiated by the base station itself. The downlink transmission of the base station in the Type2 is followed by the uplink transmission, and a time gap exists between the uplink and the downlink, wherein the time gap can be 25us (Type 2A) or 16us (Type 2B). The uplink and downlink transmissions in Type2 share the channel (Shared channel occupancy) for a certain time.

Uplink transmission in NR-U defines two channel access methods: type1 and Type2.Type1 is that the base station schedules a user to perform transmission of an uplink control channel, or schedules a user to perform transmission of an uplink shared channel, or schedules a user to perform a resource request, or sends a signal of random access. The Type2 is that the base station schedules the user to directly perform the channel access of the Type2.

Illustratively, scenario 1: as shown in fig. 1, a User (UE) of the sidelink communication selects the sidelink communication resource at time t4 by sensing at time t 1. And after the user of the side chain communication selects the side chain communication resource but before the actual side chain communication transmission is carried out, the WiFi equipment successfully accesses the channel and then carries out communication between t2 and t 3. The user performing the side chain communication performs LBT (Listen Before Talk) detection Before the actual side chain communication transmission (Before time t 4). The user of the sidelink communication detects a Busy channel (Busy) due to the communication of the WiFi user, and the LBT detection of the user of the sidelink communication fails.

Illustratively, scenario 2: as shown in fig. 2, user 1 (UE 1) in the sidelink communication selects the sidelink communication resource at time t3 by sensing (sending) at time t1, and user 2 (UE 2) in the sidelink communication selects the sidelink communication resource at time t4 by sensing (sending) at time t2. And after the LBT detection process of the UE1 is successful, selecting a side chain communication resource for side chain communication at the time t 3. And UE2 will perform LBT detection before performing the actual side chain communication transmission. UE2 detects that the channel is Busy (Busy) due to the communication of UE1, and LBT detection of UE2 fails.

Both of the above application scenarios lead to the following problems:

(1) The user of the sidelink communication cannot communicate at the time when the sidelink communication resource is selected, and the sidelink communication resource is wasted.

(2) If the user of the side-chain communication still needs to communicate, the resource needs to be acquired again, and the communication delay of the user of the side-chain communication is increased.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a channel access method, a device and a storage medium for side chain communication based on an unauthorized frequency band, which are used for solving the problem that the channel access success rate of the side chain communication based on the unauthorized frequency band is not high in the prior art.

In order to achieve the above object, an embodiment of the present invention provides a channel access method for sidelink communication based on an unlicensed frequency band, where the method is used for a sidelink communication user equipment, and the method includes: sensing and selecting target resources of an unauthorized frequency band for performing side-chain communication; performing an LBT test, and after the LBT test is successful, performing the following steps:

(1) Sending resource reservation information, wherein the resource reservation information comprises the target resource required by the side-chain communication user equipment for side-chain communication;

(2) Transmitting a placeholder signal associated with the target resource before a target start time indicated by the target resource;

(3) Performing sidelink communications on the target resource.

According to another aspect of the present invention, an embodiment of the present invention further provides a channel access method based on unlicensed band sidelink communication, where the method is used for a first user equipment, and the method includes: receiving resource scheduling request information of an unauthorized frequency band from side-chain communication user equipment; for the resource scheduling request information, sensing and selecting target resources of a corresponding unlicensed frequency band to generate resource scheduling information and LBT control information, implementing LBT detection, and sending the resource scheduling information and the LBT control information to the side-chain communication user equipment after LBT detection is successful, wherein the LBT control information at least includes information for indicating an occupancy signal to be listened by the side-chain communication user equipment when LBT detection is implemented; transmitting a placeholder signal associated with the target resource before a target start time indicated by the target resource.

According to another aspect of the present invention, an embodiment of the present invention further provides a channel access method based on unlicensed band sidelink communication, for a sidelink communication user equipment, where the method includes: sending resource scheduling request information of an unauthorized frequency band; receiving resource scheduling information and LBT control information from other user equipment, wherein the LBT control information at least comprises information indicating an occupancy signal to be intercepted when LBT detection is carried out, and the resource scheduling information at least comprises target resources of an unlicensed frequency band for the side-chain communication user equipment to carry out side-chain communication; carrying out LBT detection according to the LBT control information and monitoring the occupancy signal, and executing the following steps after the LBT detection is successful:

(1) Transmitting resource reservation information, wherein the resource reservation information indicates a target resource which needs to be reserved;

(2) Performing sidelink communications on the target resource.

According to another aspect of the present invention, an embodiment of the present invention further provides a channel access method based on unlicensed band sidelink communication, for a third user equipment, where the method includes: receiving resource reservation information of an unauthorized frequency band from side-chain communication user equipment, wherein the resource reservation information indicates target resources needing to be reserved; generating corresponding LBT control information based on the resource reservation information, implementing LBT detection, and sending the LBT control information to the side chain communication user equipment after the LBT detection is successful, wherein the LBT control information at least comprises information used for indicating an occupancy signal to be intercepted by the side chain communication user equipment when the LBT detection is implemented; transmitting a placeholder signal associated with the target resource before a target start time indicated by the target resource.

According to another aspect of the present invention, an embodiment of the present invention further provides a channel access method for sidelink communication based on an unlicensed frequency band, where the method is used for a sidelink communication user equipment, and the method includes: sensing and selecting target resources of an unauthorized frequency band for performing side-chain communication; performing an LBT test, and after the LBT test is successful, performing the following steps:

(2) Receiving LBT control information from other user equipment, wherein the LBT control information at least comprises information indicating an occupancy signal to be intercepted when LBT detection is carried out before side-chain communication is started;

(3) Carrying out LBT detection according to the LBT control information and monitoring the occupancy signal;

(4) And after the LBT detection is successful, performing side-chain communication on the target resource.

According to another aspect of the present invention, an embodiment of the present invention further provides a channel access apparatus for sidelink communication based on an unlicensed frequency band, where the apparatus is used for a sidelink communication user equipment, and the apparatus includes:

the sensing and selecting module is used for sensing and selecting target resources of an unauthorized frequency band for performing side-chain communication;

a detection and execution module for performing LBT detection and, after LBT detection is successful, executing the following steps:

(3) And performing side-chain communication on the target resource.

According to another aspect of the present invention, an embodiment of the present invention further provides a channel access apparatus for unlicensed band based sidelink communication, where the apparatus is used for a first user equipment, and the apparatus includes:

the receiving module is used for receiving the resource scheduling request information of the unauthorized frequency band from the side chain communication user equipment;

a generating and sending module, configured to sense and select, for the resource scheduling request information, a target resource of a corresponding unlicensed frequency band to generate resource scheduling information and LBT control information, implement LBT detection, and send the resource scheduling information and the LBT control information to the sidelink communication user equipment after LBT detection is successful, where the LBT control information at least includes information used to indicate an occupancy signal to be monitored by the sidelink communication user equipment when LBT detection is implemented;

and a place-occupying signal sending module, configured to send a place-occupying signal associated with the target resource before a target start time indicated by the target resource.

the sending module is used for sending the resource scheduling request information of the unauthorized frequency band;

a receiving module, configured to receive resource scheduling information and LBT control information from other user equipment, where the LBT control information at least includes information indicating an occupancy signal to be listened to when performing LBT detection, and the resource scheduling information at least includes target resources of an unlicensed frequency band used for the sidelink communication user equipment to perform sidelink communication;

a detection and execution module, configured to perform LBT detection according to the LBT control information and listen to the occupancy signal, and execute the following steps after LBT detection is successful:

(1) Transmitting resource reservation information, wherein the resource reservation information indicates target resources required to be reserved;

(2) Performing sidelink communications on the target resource.

According to another aspect of the present invention, an embodiment of the present invention further provides a channel access apparatus for unlicensed band based sidelink communication, where the apparatus is used for a third user equipment, and the apparatus includes:

a receiving module, configured to receive resource reservation information of an unlicensed frequency band from a side-chain communication user equipment, where the resource reservation information indicates a target resource that needs to be reserved;

a generating and sending module, configured to generate corresponding LBT control information based on the resource reservation information, and send the LBT control information to the side-chain communication user equipment, where the LBT control information at least includes information used to indicate an occupancy signal to be listened by the side-chain communication user equipment when performing LBT detection;

the sensing and selecting module is used for sensing and selecting the resources of the unauthorized frequency band for side-chain communication;

(2) Receiving LBT control information from other user equipment, wherein the LBT control information at least comprises information indicating an occupancy signal to be listened to when LBT detection is carried out before side-chain communication is started;

(4) And after LBT detection is successful, performing side-chain communication on the target resource.

According to another aspect of the present invention, there is also provided a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements any of the above-mentioned channel access methods based on unlicensed band sidelink communication.

In the channel access method, device and storage medium for side-chain communication based on the unauthorized frequency band, the method realizes that: the side-chain communication user equipment sends the occupancy signal associated with the target resource before the target starting time indicated by the target resource through the side-chain communication user equipment or other user equipment, so that the other user equipment or other communication systems (such as WiFi) are ensured to fail in LBT detection and cannot occupy resources of an unauthorized frequency band, the LBT detection success rate of the side-chain communication user equipment is improved, the side-chain communication user equipment can be ensured to normally carry out side-chain communication at the moment of the selected unauthorized frequency band, and the channel access success rate of the side-chain communication user equipment is improved.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

Fig. 1 is a schematic diagram illustrating a channel access scenario based on unlicensed band sidelink communication in the conventional technology.

Fig. 2 is a schematic diagram illustrating a channel access scenario of a further unlicensed band-based sidelink communication in the conventional technology.

Fig. 3 is a flowchart illustrating a channel access method based on unlicensed band sidelink communication according to an embodiment of the present invention.

Fig. 4 is a schematic operation flow diagram illustrating a channel access method based on unlicensed band sidelink communication according to yet another embodiment of the present invention.

Fig. 5 is a schematic operation flow diagram illustrating a channel access method based on unlicensed band sidelink communication according to yet another embodiment of the present invention.

Fig. 6 is a schematic operation flow diagram illustrating a channel access method based on unlicensed band sidelink communication according to yet another embodiment of the present invention.

Fig. 7 is a schematic diagram illustrating a channel access scenario based on unlicensed band sidelink communication according to an example of the present invention.

Fig. 8 is a schematic view illustrating a channel access scenario based on unlicensed band sidelink communication according to an example two of the present invention.

Fig. 9 is a schematic diagram illustrating a channel access scenario based on unlicensed band sidelink communication according to an exemplary embodiment of the present invention.

Fig. 10 is a schematic diagram illustrating a channel access scenario based on unlicensed band sidelink communication according to an example four of the present invention.

Fig. 11 is a schematic view illustrating a channel access scenario based on unlicensed band sidelink communication according to an exemplary fifth embodiment of the present invention.

Fig. 12 is a block diagram illustrating a channel access apparatus for unlicensed band based sidelink communication according to an embodiment of the present invention.

Fig. 13 shows a block diagram of a channel access apparatus for unlicensed band based sidelink communication according to another embodiment of the present invention.

Fig. 14 shows a block diagram of a channel access apparatus for unlicensed frequency band based sidelink communication according to another embodiment of the present invention.

Fig. 15 shows a block diagram of a channel access apparatus for unlicensed band based sidelink communication according to another embodiment of the present invention.

Fig. 16 shows a block diagram of a channel access apparatus for unlicensed band based sidelink communication according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware circuits or integrated circuits, or in different networks and/or processor means and/or micro-indicator means.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically, electrically or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The present invention will be described in further detail with reference to the accompanying drawings and detailed description, in order to make the objects, features and advantages thereof more comprehensible.

The user equipment referred to in the embodiments of the present invention is also referred to as a communication terminal, which is a device providing voice and/or data connectivity to a user, and the communication terminal may be a mobile terminal, such as a mobile phone (or referred to as a "cellular" phone) and a computer having a mobile terminal, for example, a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, which exchanges voice and/or data with a radio access network. For example, the terminal device may be a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), or the like. Common communication terminals include, for example: the mobile terminal includes a mobile phone, a tablet computer, a notebook computer, a handheld computer, a Mobile Internet Device (MID), and a wearable device, such as a smart watch, a smart bracelet, a pedometer, and the like, but the embodiment of the present application is not limited thereto. A communication terminal may communicate with one or more core networks through a Radio Access Network (RAN).

In view of the above, an object of the present invention is to enable full utilization of allocated sidelink communication resources and improve channel access efficiency of a user equipment for sidelink communication based on an unlicensed frequency band. Therefore, it becomes important to research a new channel access method based on unlicensed band sidelink communication.

Example one

Referring to fig. 3, the channel access method for sidelink communication based on an unlicensed frequency band according to the embodiment of the present invention is used for sidelink communication user equipment, and specifically includes the following steps:

s10, sensing and selecting target resources of an unauthorized frequency band for performing side-chain communication;

step S20, implementing LBT detection, and after LBT detection is successful, executing the following steps:

(3) And performing side-chain communication on the target resource.

The steps S10 to S20 will be specifically described below.

In step S10, the sender of the sidelink communication performs resource scheduling on the resource of the unlicensed frequency band used for the sidelink communication, for example, the sender of the sidelink communication determines, through sensing, the resource of the unlicensed frequency band available in the sidelink communication resource pool, thereby selecting a target resource of the unlicensed frequency band for which the sidelink communication is currently performed and a target resource of the unlicensed frequency band for which the sidelink communication is reserved in the future.

It should be noted that, in some embodiments of the present invention, when selecting the target resource of the unlicensed frequency band for performing the sidelink communication this time, all the target resources of the unlicensed frequency band for performing the sidelink communication in the future may also be reserved according to whether the communication service of the sidelink communication user equipment has periodicity.

In step S20, the sidelink ue performs LBT detection to determine information related to idle/busy status of the channel, and when LBT detection is successful, that is, the channel is determined to be in idle status, and the channel can be accessed, the following steps are performed:

(1) And sending resource reservation information, wherein the resource reservation information comprises the target resource required by the side-chain communication user equipment for side-chain communication.

Exemplarily, in the embodiment of the present invention, the sidelink communications user equipment uses Sidelink Control Information (SCI) to transmit resource reservation information, where the resource reservation information includes time-frequency resource information of the target resource required for the sidelink communications user equipment itself to perform the sidelink communications. Specifically, the sidelink communication user equipment uses the Sidelink Control Information (SCI) to send resource reservation information to broadcast to other user equipments (e.g. cellular network users such as 4G and 5G) which target time to use the resource of which target frequency band for sidelink communication next, so that the other user equipments can sense the target resource and the use time of the target resource, thereby avoiding the target resource being preempted by other user equipments before starting the use of sidelink communication.

illustratively, in the embodiment of the present invention, before the sidechain communication user equipment (the transmitting end of sidechain communication) performs transmission using the selected unlicensed frequency band target resource, the sidechain communication user equipment further transmits at least one occupancy signal, and the at least one occupancy signal ensures that the sidechain communication user equipment (the transmitting end of sidechain communication) can perform sidechain communication using the selected unlicensed frequency band target resource.

Optionally, in this embodiment of the present invention, the time-frequency resource and the power used by the placeholder signal may be determined by the sidelink communication user equipment (a transmitting end of the sidelink communication) itself.

In this embodiment of the present invention, sending the placeholder signal associated with the target resource refers to: the frequency band where the occupancy signal is located needs to completely cover the target frequency band corresponding to the target resource, so that the target frequency band corresponding to the target resource can be occupied, and therefore before the target resource of the selected unauthorized frequency band is used for transmission, the occupancy signal is sent to ensure that other user equipment or other communication systems (such as WiFi) can fail in LBT detection, namely, the WiFi can not seize the resource before the transmission of a sending end (side chain communication user equipment) of side chain communication to cause the LBT detection failure of the side chain communication user equipment (the sending end of side chain communication).

(3) And the side-chain communication user equipment (a transmitting end of the side-chain communication) performs side-chain communication on the selected target resource.

It should be understood that, in this embodiment, since the sidelink communications ue transmits the occupancy signal for itself, the time period for transmitting the occupancy time and the time period for performing the LBT detection are non-overlapping.

The channel access method based on the side-chain communication of the unauthorized frequency band provided by the embodiment of the invention can realize that:

the side-chain communication user equipment sends the occupancy signal associated with the target resource before the target starting time indicated by the target resource by the side-chain communication user equipment, and ensures that other user equipment or other communication systems (such as WiFi) can fail in LBT detection, so that the LBT detection success rate of the side-chain communication user equipment is improved, the side-chain communication user equipment can be ensured to normally carry out side-chain communication at the moment of the selected unauthorized frequency band, and the channel access success rate of the side-chain communication user equipment is improved.

Further, the sending the placeholder signal associated with the target resource before the target start time indicated by the target resource comprises:

determining parameter information associated with the occupancy signal, and transmitting the occupancy signal based on the parameter information, wherein the parameter information comprises at least one or a combination of the following items:

(1) Time domain resource information associated with the occupancy signal;

(2) Frequency domain resource information associated with the occupancy signal;

(3) Power information associated with the occupancy signal;

(4) Beam information associated with the occupancy signal.

Specifically, the time domain resource information associated with the placeholder signal, for example, a start time T1 and an end time T2 of the placeholder signal transmitted by the sidelink communication user equipment, where T1< T2. The start time and the end time are in units of milliseconds, or frames, or subframes, or slots, or OFDM symbols. The time for the side-chain communication user equipment to transmit the occupancy signal may also be discontinuous, for example, the time period for the side-chain communication user equipment to transmit the occupancy signal is a starting time T1 to an ending time T1+ a, and a starting time T1+ b to an ending time T2, where T1< T1+ a < T1+ b < T2.

Specifically, the frequency domain resource information associated with the placeholder signal, for example, a starting frequency domain position F1 and an ending frequency domain position F2 of the placeholder signal transmitted by the sidelink communication user equipment, where F1< F2. The start frequency and the end frequency are in units of a Bandwidth (BW), or a partial Bandwidth (BWP), or a Sub-channel (Sub-channel), or a Physical Resource Block (PRB), or a Subcarrier (Subcarrier). The frequency domain resources of the placeholder signal sent by the side-chain communication user equipment may also be discontinuous, for example, the frequency domain resources of the placeholder signal sent by the side-chain communication user equipment are a starting frequency domain position F1 to an ending frequency domain position F1+ c, and a starting frequency domain position F1+ d to an ending frequency domain position F2, where F1< F1+ c < F1+ d < F2.

Specifically, the power information associated with the occupancy signal, for example, the transmission power of the occupancy signal transmitted by the sidelink communications user equipment. Specifically, the beam information associated with the occupancy signal, for example, when the sidechain communication user equipment performs sidechain communication using millimeter wave communication, the occupancy signal transmitted by the sidechain communication user equipment further includes information about the beam, such as beam width, beam direction, and the like.

For example, the parameter information associated with the occupancy signal may be indicated by Downlink Control Information (DCI) or RRC (Radio Resource Control) signaling of the base station.

For example, the parameter information associated with the placeholder signal may be preset, for example, a set of the above parameters is set for a sidelink communication resource pool (sidelink resource pool) or a sidelink bandwidth part (sidelink bandwidth part).

Further, in order to avoid that the cellular network system occupies resources of the unlicensed frequency band for a long time by transmitting the occupancy signal, the method further includes: limiting the occupancy signal sent by the side-chain communication user equipment based on a first preset rule; wherein the first preset rule comprises at least one or a combination of the following items:

(1) A total duration of the occupancy signal transmitted;

(2) A frequency threshold of the transmitted occupancy signal;

(3) A maximum power value of the transmitted occupancy signal;

(4) The transmitted beam-related parameters of the occupancy signal.

Total duration T of the occupancy signal with respect to transmission _total In particular, if the sidelink communications user equipment transmits the placeholder signal only once within the time T, the placeholder signal lasts for at most T _total The time of (c). If the sidechain communication user equipment transmits a plurality of occupancy signals within the time T, the sum of the durations of the plurality of occupancy signals is at most T _total 。

Regarding the frequency of the placeholder signals to be transmitted, specifically, for example, the sidelink communications user equipment transmits the placeholder signals M times at most within the time T, or the sidelink communications user equipment transmits K placeholder signals at most within the time T.

Regarding the maximum power P of the transmitted occupancy signal, specifically, the maximum power P of the occupancy signal needs to ensure that a user of another communication system, for example, a WiFi user, determines that a channel is in a busy state when performing LBT detection, and thus cannot access the channel.

The parameter related to the transmitted occupied signal beam is specifically the number of beams transmitting occupied signals, or the beam used for transmitting occupied signals is a beam in a certain direction or a certain range of directions, or the beam used for transmitting occupied signals is a beam in a certain beam width or a certain range of widths.

With respect to the occupancy signal being limited for transmission with the above combination, the occupancy signal is limited for transmission using, for example, a time and frequency combination of transmitting the occupancy signal. Specifically, the side-chain communication user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), and the number of times of sending the occupancy signal in each time period is (M1, M2, … Mn). Or the side chain communication user equipment sends the occupancy signals in n time periods (T1, T2, … Tn), and the number of the occupancy signals sent in each time period is (K1, K2, … Kn).

The transmission of the occupancy signal is limited, for example, using a combination of time and power to transmit the occupancy signal. Specifically, the side chain communication user equipment sends the placeholder signal in n time periods (T1, T2, … Tn, n is larger than or equal to 1), and the maximum power for sending the placeholder signal in each time period is (P1, P2, … Pn).

The transmission of the occupancy signal is limited, for example, using the time and beam combination at which the occupancy signal is transmitted. Specifically, the side chain communication user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), and the beam direction for transmitting the occupancy signal in each time period is (theta 1, theta 2, … theta n). Or the side chain communication user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n is more than or equal to 1), and the beam width of the occupancy signal sent in each time period is (w 1, w2, … wn).

For example, using a combination of frequency and power with which the occupancy signal is transmitted to limit the transmission of the occupancy signal. Specifically, the side-chain communication user equipment transmits the occupancy signal M times within the time T, and the maximum power of transmitting the occupancy signal each time is (P1, P2, … Pm). Or the side chain communication user equipment sends K occupation signals within the time T, and the maximum power of each occupation signal is (P1, P2, … Pk).

The transmission of the occupancy signal is limited, for example, using a combination of transmit occupancy signal power and beam-related parameters. Specifically, the sidelink communication user equipment transmits the occupancy signal in n beam directions (θ 1, θ 2, … θ n), and the maximum power of the occupancy signal transmitted in each beam direction is (P1, P2, … Pn).

For example, the time, frequency, and power combination of transmitting the occupancy signal is used to limit the transmission of the occupancy signal. Specifically, the side chain communication user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n is greater than or equal to 1), the number of times of sending the occupancy signal in each time period is (M1, M2, … Mn), and the maximum power of the occupancy signal sent each time in each corresponding time period is (P1, P2, … Pn).

The transmission of the occupancy signal is limited, for example, using a combination of time, frequency, and beam parameter of transmission of the occupancy signal. Specifically, the side chain communication user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the number of times of transmitting the occupancy signal in each time period is (M1, M2, … Mn), and the beam direction of the occupancy signal transmitted each time in the corresponding time period is (θ 1, θ 2, … θ n).

The transmission of the occupancy signal is limited, for example, using a combination of time, power, and beam parameter for transmitting the occupancy signal. Specifically, the side chain communication user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n is greater than or equal to 1), the maximum power of transmitting the occupancy signal in each time period is (P1, P2, … Pn), and the beam direction of the occupancy signal transmitted each time in each corresponding time period is (θ 1, θ 2, … θ n).

The transmission of the occupancy signal is limited, for example, using a combination of frequency, power, and beam parameter of transmitting the occupancy signal. Specifically, the side chain communication user equipment transmits the occupancy signals M times within time T, where a beam direction of the occupancy signal transmitted each time is (θ 1, θ 2, … θ n), and a maximum power of the occupancy signal transmitted each corresponding time is (P1, P2, … Pm).

The transmission of the occupancy signal is limited, for example, using a combination of time, frequency, power, and beam parameter of the transmission of the occupancy signal. Specifically, the side chain communication user equipment transmits an occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the number of times of transmitting the occupancy signal in each time period is (M1, M2, … Mn), the beam direction of the occupancy signal transmitted each time is (θ 1, θ 2, … θ n), and the maximum power of the occupancy signal transmitted each time is (P1, P2, … Pm).

It should be understood that the various parameters described above that limit the transmission of the occupancy signal may also be adjusted. For example, when the LBT detection of the sidelink communications ue fails, the parameters limiting the transmission of the occupancy signal are adjusted. In particular, when the LBT detection of the sidelink communications user equipment fails, at least one of the following adjustments may be made:

(1) Increasing the transmission power of the occupancy signal;

(2) Increasing a duration of transmitting the occupancy signal;

(3) Increasing the number of beams transmitting the occupancy signals;

(4) The width of the beam used to transmit the occupancy signal is increased.

Illustratively, for example, the sidelink communication UE transmits an occupancy signal with power P, and its LBT detects a power greater than P _th ，P _th And judging the conditions of LBT success and failure for the side-chain communication user equipment. Specifically, when the signal strength detected by the side-chain communication user equipment is greater than P _th And if so, failing to detect the LBT of the sidelink communication user equipment, and failing to access the channel for communication by the sidelink communication user equipment. When the signal strength detected by the side-chain communication user equipment does not exceed P _th If the LBT detection is successful, the sidelink communication user equipment can access the channel for communication. When the side chain communication user equipment LBT detection fails, the next transmission is carried outThe sidechain communications subscriber device may correspondingly increase the power of the occupancy signal to P ' (P ') upon the occupancy signal '>P) such that the user LBT detection of the other communication system fails.

Illustratively, for example, after the sidelink communications user equipment transmits the occupancy signal in the time period T, LBT detection fails in another time period T' before actually performing sidelink communications. The sidelink communication user equipment may determine that the user of the other communication system has successfully accessed the channel for the time period T'. When the occupancy signal is transmitted next time, the sidelink communication user equipment may correspondingly increase the time period for transmitting the occupancy signal, so that the user LBT detection of the other communication system fails.

Illustratively, for example, the side-chain communication ue transmits an occupancy signal in the beam direction α 1, fails to perform LBT detection in the beam direction α 2 before actually performing side-chain communication, and does not transmit an occupancy signal in the beam direction. The sidelink communication user equipment may determine that a user having another communication system has successfully accessed the channel in the direction of the beam direction α 2. When the occupancy signal is transmitted next time, the sidechain communication user equipment can correspondingly increase the beam for transmitting the occupancy signal, so that the user LBT detection of other communication systems fails.

Example two

As shown in fig. 4, unlike fig. 3, in the present embodiment, an occupancy signal is transmitted by the first user equipment for the sidelink communication user equipment to be subjected to sidelink communication.

Exemplarily, first, a first user equipment receives resource scheduling request information of an unlicensed frequency band from a sidelink communications user equipment, and second, for the resource scheduling request information, the first user equipment senses and selects a target resource of a corresponding unlicensed frequency band to generate resource scheduling information and LBT control information, performs LBT detection, and sends the resource scheduling information and the LBT control information to the sidelink communications user equipment after LBT detection is successful, wherein the resource scheduling information at least includes a target resource of the unlicensed frequency band used for the sidelink communications user equipment to perform sidelink communications, and the LBT control information at least includes information for indicating a placeholder signal to be listened by the sidelink communications user equipment when performing LBT detection; then, a placeholder signal associated with the target resource is sent before a target start time indicated by the target resource.

For example, in this embodiment, the first user equipment, as a sender of the occupancy signal, may roughly belong to the following three situations: in a first case, the first user equipment may be a user equipment which does not communicate with any user equipment, in a second case, the first user equipment may be a user equipment which performs a sidelink communication with the sidelink communication user equipment, and in a third case, the first user equipment may be a user equipment which performs an uplink communication with a base station.

For the first scenario, the first ue may additionally transmit a signal as an occupancy signal; for the second case, the first ue may transmit an occupancy signal when transmitting the side-chain signal, or use the transmitted side-chain signal as the occupancy signal; for the third scenario, the first ue may transmit an occupancy signal when transmitting the uplink signal, or use the transmitted uplink signal as the occupancy signal.

Specifically, in this embodiment, the first user equipment schedules target resources in an unlicensed frequency band for the sideline communication user equipment and sends an occupancy signal, for example, in a multicast mode (groupcast), a group leader schedules target resources for sideline communication for a group member; for example, in unicast mode (unicast), the sender schedules a target resource for sidelink communication for the receiver. For example, the first user equipment generates resource scheduling information and LBT control information, and then transmits the resource scheduling information and the LBT control information to the sidelink communication user equipment through Sidelink Control Information (SCI).

Specifically, the information of the occupancy signal may carry, for example, time-frequency resources and power information at least used by the occupancy signal.

Further, at least one time period during which the transmitted occupancy signal lasts at least overlaps with at least one time period during which the sidechain communication user equipment performs LBT detection.

Further, in this embodiment, the LBT control information further includes one or more of time-domain resource information, frequency-domain resource information, beam information, and information for determining a channel busy state, where the side-chain communication user equipment performing side-chain communication performs LBT detection.

It should be understood that, in the embodiment of the present invention, the time-frequency resources and power of the placeholder signal sent by the first user equipment are the same as the time-frequency resources and power information of the placeholder signal in the LBT control information sent by the first user equipment to the sidelink communication user equipment.

Further, in this embodiment of the present invention, in order to avoid that the cellular network system occupies resources in the unlicensed frequency band for a long time by sending the occupancy signal, the method further includes: and limiting the occupancy signal sent by the first user equipment based on a third preset rule. Wherein the third preset rule comprises at least one or a combination of the following items:

(1) A total duration of the occupancy signal transmitted;

(2) A frequency threshold of the transmitted occupancy signal;

(3) A maximum power value of the transmitted occupancy signal;

(4) The transmitted occupancy signal beam-related parameters.

Total duration T of the occupancy signal with respect to transmission _total In particular, if the first user equipment transmits the occupancy signal only once within the time T, the occupancy signal lasts for at most T _total Time of (d). If the first user equipment transmits the plurality of occupancy signals within the time T, the sum of the durations of the plurality of occupancy signals is at most T _total 。

Regarding the frequency threshold of the sent occupancy signal, specifically, for example, the first user equipment sends the occupancy signal at most M times within the time T, or the first user equipment sends K occupancy signals at most within the unit time T.

Regarding the maximum power value of the transmitted occupancy signal, that is, the maximum power value of the occupancy signal needs to ensure that users of other communication systems, for example, wiFi users, determine that the channel is in a busy state when performing LBT detection, and thus cannot access the channel.

The parameters related to the transmitted occupied signal beams are, specifically, the number of beams transmitting occupied signals, or the beam used for transmitting occupied signals is a beam in a certain direction or a certain range of directions, or the beam used for transmitting occupied signals is a beam in a certain beam width or a certain range of widths.

With respect to the occupancy signal being limited for transmission with the above combination, the occupancy signal is limited for transmission using, for example, a time and frequency combination of transmitting the occupancy signal. Specifically, the first user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), and the number of times of sending the occupancy signal in each time period is (M1, M2, … Mn). Or the first user equipment sends the occupancy signals in n time periods (T1, T2, … Tn), and the number of the occupancy signals sent in each time period is (K1, K2, … Kn).

For example, the time and power combination of transmitting the occupancy signal is used to limit the transmission of the occupancy signal. Specifically, the first user equipment sends the placeholder signal in n time periods (T1, T2, … Tn, n is greater than or equal to 1), and the maximum power for sending the placeholder signal in each time period is (P1, P2, … Pn).

For example, the time and beam combination at which the occupancy signal is transmitted is used to limit the transmission of the occupancy signal. Specifically, the first user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), and the beam direction for transmitting the occupancy signal in each time period is (θ 1, θ 2, … θ n). Or the first user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n is more than or equal to 1), and the beam width of the occupancy signal sent in each time period is (w 1, w2, … wn).

For example, a frequency and power combination of transmitting the occupancy signal is used to limit transmission of the occupancy signal. Specifically, the first user equipment transmits the occupancy signal M times within the time T, and the maximum power of transmitting the occupancy signal each time is (P1, P2, … Pm). Or the first user equipment transmits K occupancy signals within the time T, and the maximum power of each occupancy signal is (P1, P2, … Pk).

For example, the transmission of the occupancy signal is limited using a combination of transmit occupancy signal power and beam-related parameters. Specifically, the first user equipment transmits the occupancy signals in n beam directions (θ 1, θ 2, … θ n), and the maximum power of the occupancy signals transmitted in each beam direction is (P1, P2, … Pn).

For example, the time, frequency, and power combination of transmitting the occupancy signal are used to limit the transmission of the occupancy signal. Specifically, the first user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n is greater than or equal to 1), the number of times of sending the occupancy signal in each time period is (M1, M2, … Mn), and the maximum power of the occupancy signal sent each time in each corresponding time period is (P1, P2, … Pn).

For example, the time, frequency, and beam parameter combination of transmitting the occupancy signal are used to limit the transmission of the occupancy signal. Specifically, the first user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the number of times of transmitting the occupancy signal in each time period is (M1, M2, … Mn), and the beam direction of the occupancy signal transmitted each time in each corresponding time period is (θ 1, θ 2, … θ n).

For example, the time, power, and beam parameter combination of transmitting the occupancy signal are used to limit the transmission of the occupancy signal. Specifically, the first user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the maximum power for transmitting the occupancy signal in each time period is (P1, P2, … Pn), and the beam direction of the occupancy signal transmitted each time in the corresponding time period is (θ 1, θ 2, … θ n).

For example, the frequency, power, and beam parameter combination of transmitting the occupancy signal is used to limit the transmission of the occupancy signal. Specifically, the first user equipment transmits the occupancy signal M times within the time T, a beam direction of the occupancy signal transmitted each time is (θ 1, θ 2, … θ n), and a maximum power of the occupancy signal transmitted each time is (P1, P2, … Pm).

For example, the time, frequency, power, and beam parameter combination of transmitting the occupancy signal is used to limit the transmission of the occupancy signal. Specifically, the first user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the number of times of transmitting the occupancy signal in each time period is (M1, M2, … Mn), the beam direction of the occupancy signal transmitted each time is (θ 1, θ 2, … θ n), and the maximum power of transmitting the occupancy signal each time is (P1, P2, … Pm).

It should be understood that the various parameters described above that limit the transmission of the occupancy signal may also be adjusted. For example, when the LBT detection of the sidelink communications ue fails, the first ue receives the reported information after the LBT detection of the sidelink communications ue fails, and adjusts each parameter for limiting the transmission of the occupancy signal according to the reported information. In particular, due to a failure of LBT detection of the sidelink communications user equipment, at least one of the following adjustments may be made:

(1) Increasing a duration of transmitting the occupancy signal;

(2) Increasing the number/frequency of transmitting the occupancy signal;

(3) Increasing frequency domain resources used for transmitting the occupancy signals;

(4) Increasing the transmission power of the occupancy signal;

(5) Increasing the number of beams transmitting the occupancy signals;

(6) The width of the beam used to transmit the occupancy signal is increased.

Further, if the first user equipment and the sidelink communications user equipment are to perform sidelink communications therebetween, the first user equipment may determine whether the LBT detection of the sidelink communications user equipment is successful by determining whether the sidelink communications user equipment successfully transmits the sidelink communications service to the first user equipment, and specifically, if the first user equipment successfully receives the sidelink communications service of the sidelink communications user equipment, the LBT detection of the sidelink communications user equipment is considered to be successful.

It should be noted that the first user equipment transmits the placeholder signal for another sidelink communication user equipment, or the first user equipment transmits the placeholder signal for a plurality of sidelink communication user equipments. The embodiments of the invention are not limited thereto.

Further, the adjustment of the relevant parameters of the placeholder signals further includes reducing the success rate of side-chain communication user access channels to balance the utilization rate of the cellular network users and other communication system users to the unauthorized frequency band.

Specifically, the first ue sending the occupancy signal may also adjust the parameter of the occupancy signal according to the result of successful or failed LBT detection fed back by the sidelink communication ue. Specifically, when the LBT detection success rate of a side-chain communication user equipment or the average LBT detection success rate of a plurality of side-chain communication user equipments reaches a threshold X within a certain time, the occupancy signal is adjusted based on a fourth preset rule; wherein the fourth preset rule comprises at least one of:

(1) Reducing a duration of a single transmission of the occupancy signal;

(2) Reducing the sum of the durations of the multiple transmissions of the occupancy signal;

(3) Reducing the transmit power of the occupancy signal;

(4) Reducing the frequency of sending the occupancy signal within a certain time;

(5) Reducing a beam direction when the occupancy signal is transmitted using a beam.

Specifically, the first user equipment transmitting the occupancy signal may also set a counter for the transmission of the occupancy signal. Specifically, the occupancy signal counter is incremented by 1 each time an occupancy signal is sent. When the occupancy signal transmission frequency counter reaches a threshold Q1, starting to adjust parameters of the occupancy signal, where the specific adjustment method includes at least one of:

(1) Reducing the duration of a single-sent occupancy signal;

(2) Reducing the sum of the durations of multiple transmissions of the occupancy signal;

(3) Reducing the transmission power of the occupancy signal;

(4) Reducing the frequency of transmitting the occupancy signal within a certain time;

(5) Reducing a beam direction when transmitting the occupancy signal using the beam;

specifically, the occupancy signal counter is decremented by 1 each time the parameters of the occupancy signal are adjusted. When the occupancy signal transmission frequency counter reaches a threshold value Q2, the parameters are not adjusted when the occupancy signal is transmitted next time. Or readjusting the parameters when the occupancy signal is sent next time, specifically as follows:

(1) Extending the duration of a single-transmitted occupancy signal;

(2) Extending the sum of the durations of the multiple transmissions of the occupancy signal;

(3) Increasing the transmission power of the occupancy signal;

(4) Increasing the frequency of transmitting the occupancy signal within a certain time;

(5) The beam direction is increased when the occupancy signal is transmitted using the beam.

Specifically, in the embodiment of the present invention, after the parameter of the occupancy signal is adjusted, the parameter of the occupancy signal is adjusted according to the result of the LBT success or failure fed back by the adjusted side chain communication user equipment performing side chain communication. Specifically, when the LBT success rate of one sidelink communications user equipment or the average LBT success rate of a plurality of sidelink communications user equipments is less than the threshold X within a certain time, the parameter of the occupancy signal is adjusted. The specific adjusting method comprises at least one of the following steps:

(1) Extending the duration of a single-transmitted occupancy signal;

(3) Increasing the transmission power of the occupancy signal;

Continuing to refer to fig. 4, an embodiment of the present invention provides a channel access method for sidelink communication based on an unlicensed frequency band, where the method is used for a sidelink communication user equipment, and the method includes:

sending resource scheduling request information of an unauthorized frequency band;

receiving resource scheduling information and LBT control information from other user equipment, wherein the LBT control information at least comprises information indicating an occupancy signal to be intercepted when LBT detection is carried out, and the resource scheduling information at least comprises target resources of an unlicensed frequency band for the side-chain communication user equipment to carry out side-chain communication;

carrying out LBT detection according to the LBT control information and monitoring the occupancy signal, and executing the following steps after the LBT detection is successful:

(2) And performing side-chain communication on the target resource.

Specifically, the time domain resource information for performing the LBT detection by the sidelink communications ue performing the sidelink communications according to the LBT control information is, for example: the side chain communication user equipment implements a start time T1 and an end time T2 of LBT detection, wherein T1< T2. The start time and the end time are in units of milliseconds, or frames, or subframes, or slots, or OFDM symbols. The time for performing LBT detection by the sidelink ues may also be discontinuous, for example, the time period for LBT detection is from a start time T1 to an end time T1+ a, and from the start time T1+ b to an end time T2, where T1< T1+ a < T1+ b < T2.

The frequency domain resource information of the sidechain communication ue performing LBT detection according to the LBT control information is, for example: the side chain communication user equipment implements a starting frequency domain position F1 and an ending frequency domain position F2 of LBT detection, where F1< F2. The start frequency domain and the end frequency domain are in units of a Bandwidth (BW), or a partial Bandwidth (BWP), or a Sub-channel (Sub-channel), or a Physical Resource Block (PRB), or a Subcarrier (Subcarrier). The frequency domain resources for performing LBT detection by the side chain communication user equipment may also be discontinuous, for example, the frequency domain resources for performing LBT detection are a starting frequency domain position F1 to an ending frequency domain position F1+ c, and a starting frequency domain position F1+ d to an ending frequency domain position F2, where F1< F1+ c < F1+ d < F2.

The beam information for performing the LBT detection by the sidelink communications ue according to the LBT control information is, for example: when the side chain communication uses the millimeter wave communication, the LBT control information also includes information on the beam used, such as the beam width, the beam direction, and the like.

And when the side chain communication user equipment for side chain communication carries out LBT detection according to the LBT control information, judging the relevant information of the idle and busy state of the channel. Specifically, since the first ue may send the occupancy signal to prevent users of other communication systems from accessing the channel, the sidelink ue may detect the energy of the occupancy signal when performing the LBT detection. When the energy of the occupancy signal exceeds a certain threshold, according to the current LBT detection mechanism, the side-chain communication user equipment may determine that the channel is busy, thereby causing LBT detection failure and failing to access the channel. To prevent this, the first user equipment needs to indicate the power of the sidelink communication user equipment occupancy signal and the time-frequency resources used by the occupancy signal. The time frequency resource used by the occupancy signal may be the same as the time frequency resource to be monitored when the side chain communication user equipment performs LBT, or may be different from the time frequency resource to be monitored when the side chain communication user equipment performs LBT. For example, the occupancy signal is sent in the time period [ T1, T2], but the first user equipment indicates that the side chain communication user equipment only needs to listen for signals within the detection time period [ T1+ a, T2-b ] (T1 < T1+ a < T2-b < T2). For example, the occupancy signal is sent in the frequency domain location [ F1, F2], but the first user equipment indicates that the side chain communication user equipment only needs to listen for signals within a detection time period of [ F1+ a, F2-b ] (F1 < F1+ a < F2-b < F2).

It should be understood that, for specific limitations, implementation manners, and effects of the foregoing steps, reference may be made to the related contents of the foregoing channel access method based on unlicensed frequency band sidelink communication, and details are not described herein again.

EXAMPLE III

As shown in fig. 5, in the present embodiment, similarly to fig. 4, the occupancy signal is sent by the third ue for the sidelink communications ue about to perform sidelink communications. Different from fig. 4, the side-chain communication device senses and selects target resources of an available unlicensed frequency band in a side-chain communication resource pool according to a requirement for performing side-chain communication, then performs LBT detection, and sends resource reservation information after LBT detection is successful, so as to inform other user devices of the target resources to be used when performing side-chain communication. In general, the sidelink communication ue performs LBT detection before transmitting resource reservation information and performing sidelink communication (transmitting data of the sidelink communication), and needs to transmit after the LBT detection is successful. However, the two LBT detections are different in that the first LBT detection performed by the sidelink ues is based on the corresponding LBT parameters (e.g. the time period, frequency domain position, beam related parameters, power for which LBT needs to be detected) indicated by the base station; the second performing of the LBT detection by the sidelink communications user equipment is performed according to the parameters in the LBT control information received from the third user equipment.

Further, fig. 6 shows an operation flow diagram of a channel access method based on unlicensed frequency band sidelink communication according to another embodiment of the present invention. In this embodiment, when a time difference between an end time of the third ue sending the occupancy signal associated with the target resource and a start time of the sidechain communication ue performing sidechain communication is smaller than a preset threshold, the sidechain communication ue may skip the step of performing LBT detection based on the LBT control information received from the third ue, and directly perform sidechain communication.

Illustratively, if the time difference between the ending time of the third user equipment transmitting the occupancy signal associated with the target resource and the starting time of the sidelink communications user equipment performing the sidelink communications is less than the preset threshold Td, it should be considered that the transmission of the occupancy signal can effectively prevent the users of other communications systems (WiFi) from successfully performing LBT, and therefore, the sidelink communications user equipment may consider that, even if there is a WiFi user attempting to perform the sidelink communications within the time period selected by the WiFi user for performing the sidelink communications, the WiFi user cannot successfully access the channel because the presence of the occupancy signal transmitted by the third user equipment causes the LBT detection of the WiFi user to fail, and then the sidelink communications user equipment may skip the LBT detection before actually performing the sidelink communications transmission and directly perform the sidelink communications. Optionally, the time difference Td of the preset threshold may be configured by the base station through RRC signaling, or a PDCCH (Physical Downlink Control Channel), or a PDSCH (Physical Downlink Shared Channel), or an SIB, or an MIB.

Illustratively, as shown in fig. 5, the present invention provides a channel access method based on unlicensed band sidelink communication, for a third user equipment, where the method includes: firstly, a third user device receives resource reservation information of an unauthorized frequency band from a side-chain communication user device, wherein the resource reservation information indicates target resources needing to be reserved; secondly, the third user equipment generates corresponding LBT control information based on the resource reservation information, and sends the LBT control information to the side chain communication user equipment, wherein the LBT control information at least comprises information used for indicating an occupancy signal to be intercepted by the side chain communication user equipment when LBT detection is carried out; then, a placeholder signal associated with the target resource is sent before a target start time indicated by the target resource.

It should be noted that, in this embodiment, the third user equipment as a sender of the occupancy signal can roughly belong to the following three situations: in a first case, the third ue may be a ue that is not in communication with any ue, in a second case, the third ue may be a ue in sidelink communication with the sidelink communication ue, and in a third case, the third ue may be a ue in uplink communication with the base station.

For the first case, the third ue may additionally send a signal as an occupancy signal; for the second case, the third ue may send an occupancy signal when sending the side-chain signal, or use the sent side-chain signal as the occupancy signal; for the third scenario, the third ue may send an occupancy signal when sending the uplink signal, or use the sent uplink signal as the occupancy signal.

Further, in this embodiment, the LBT control information further includes one or more of time domain resource information, frequency domain resource information, beam information, and information for determining a channel idle/busy state, where the side chain communication ue performing the side chain communication performs LBT detection.

It should be understood that, in the embodiment of the present invention, the time-frequency resources and power of the occupancy signal sent by the third user equipment are the same as the time-frequency resources and power information of the occupancy signal in the LBT control information sent by the third user equipment to the sidelink communication user equipment.

Further, in this embodiment of the present invention, in order to avoid that the cellular network system occupies resources in the unlicensed frequency band for a long time by sending the occupancy signal, the method further includes: and limiting the occupancy signal sent by the third user equipment based on a fifth preset rule. Wherein the fifth preset rule comprises at least one or a combination of the following:

(1) A total duration of the occupancy signal transmitted;

(2) A frequency threshold of the transmitted occupancy signal;

(3) A maximum power value of the transmitted occupancy signal;

(4) The transmitted beam-related parameters of the occupancy signal.

With respect to the transmitted occupancy signalTotal duration T _total In particular, if the third user equipment transmits the occupancy signal only once within the time T, the occupancy signal lasts for at most T _total Time of (d). If a third user equipment transmits a plurality of occupancy signals within time T, the sum of the durations of the plurality of occupancy signals is at most T _total 。

Regarding the frequency threshold of the transmitted occupancy signal, specifically, for example, the third user equipment transmits the occupancy signal at most M times within the time T, or the third user equipment transmits at most K occupancy signals within the unit time T.

With respect to the occupancy signal being limited for transmission with the above combination, the transmission of the occupancy signal is limited, for example, using a time and frequency combination of transmitting the occupancy signal. Specifically, the third user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), and the number of times of sending the occupancy signal in each time period is (M1, M2, … Mn). Or the third user equipment transmits the occupancy signals in n time periods (T1, T2, … Tn), and the number of the occupancy signals transmitted in each time period is (K1, K2, … Kn).

For example, the time and power combination of transmitting the occupancy signal is used to limit the transmission of the occupancy signal. Specifically, the third user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), and the maximum power for sending the occupancy signal in each time period is (P1, P2, … Pn).

For example, the time and beam combination at which the occupancy signal is transmitted is used to limit the transmission of the occupancy signal. Specifically, the third user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), and the beam direction for transmitting the occupancy signal in each time period is (θ 1, θ 2, … θ n). Or the third user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n is more than or equal to 1), and the beam width of the occupancy signal sent in each time period is (w 1, w2, … wn).

For example, a frequency and power combination of transmitting the occupancy signal is used to limit transmission of the occupancy signal. Specifically, the third user equipment transmits the occupancy signal M times within the time T, and the maximum power of transmitting the occupancy signal each time is (P1, P2, … Pm). Or the third user equipment sends K occupancy signals within time T, and the maximum power of each occupancy signal is (P1, P2, … Pk).

For example, the transmission of the occupancy signal is limited using a combination of transmit occupancy signal power and beam-related parameters. Specifically, the third user equipment transmits the occupancy signal in n beam directions (θ 1, θ 2, … θ n), and the maximum power of the occupancy signal transmitted in each beam direction is (P1, P2, … Pn).

For example, the time, frequency, and power combination of transmitting the occupancy signal are used to limit the transmission of the occupancy signal. Specifically, the third user equipment sends the occupancy signal in n time periods (T1, T2, … Tn, n is greater than or equal to 1), the number of times of sending the occupancy signal in each time period is (M1, M2, … Mn), and the maximum power of the occupancy signal sent each time in each corresponding time period is (P1, P2, … Pn).

For example, the time, frequency, and beam parameter combination of transmitting the occupancy signal are used to limit transmission of the occupancy signal. Specifically, the third user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the number of times of transmitting the occupancy signal in each time period is (M1, M2, … Mn), and the beam direction of the occupancy signal transmitted each time in the corresponding time period is (θ 1, θ 2, … θ n).

For example, the time, power, and beam parameter combination of transmitting the occupancy signal are used to limit the transmission of the occupancy signal. Specifically, the third user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the maximum power for transmitting the occupancy signal in each time period is (P1, P2, … Pn), and the beam direction of the occupancy signal transmitted each time in the corresponding time period is (θ 1, θ 2, … θ n).

For example, the frequency, power, and beam parameter combination of transmitting the occupancy signal is used to limit the transmission of the occupancy signal. Specifically, the third user equipment transmits the occupancy signal M times within the time T, the beam direction of the occupancy signal transmitted each time is (θ 1, θ 2, … θ n), and the maximum power of the occupancy signal transmitted each time is (P1, P2, … Pm).

For example, the time, frequency, power, and beam parameter combination of transmitting the occupancy signal is used to limit the transmission of the occupancy signal. Specifically, the third user equipment transmits the occupancy signal in n time periods (T1, T2, … Tn, n ≧ 1), the number of times of transmitting the occupancy signal in each time period is (M1, M2, … Mn), the beam direction of the occupancy signal transmitted each time is (θ 1, θ 2, … θ n), and the maximum power of transmitting the occupancy signal each time is (P1, P2, … Pm).

It should be understood that the various parameters described above that limit the transmission of the occupancy signal may also be adjusted. For example, when the LBT detection performed by the sidechain communication ue according to the LBT control information fails, the third ue receives the report information after the LBT detection of the sidechain communication ue fails, and adjusts each parameter for limiting the transmission of the placeholder signal according to the report information. In particular, due to failure of LBT detection of the sidelink communication user equipment, at least one of the following adjustments may be made:

(1) Increasing a duration of transmitting the occupancy signal;

(2) Increasing the number/frequency of transmitting the occupancy signal;

(4) Increasing the transmission power of the occupancy signal;

(5) Increasing the number of beams transmitting the occupancy signals;

(6) The width of the beam used to transmit the occupancy signal is increased.

Further, if the third user equipment and the sidelink communication user equipment are to perform sidelink communication therebetween, the third user equipment may determine whether LBT detection of the sidelink communication user equipment is successful by determining whether the sidelink communication user equipment successfully sends a sidelink communication service to the third user equipment, and specifically, if the third user equipment successfully receives the sidelink communication service of the sidelink communication user equipment, it is determined that LBT detection of the sidelink communication user equipment fails.

It should be noted that the one third ue transmits the placeholder signal for another sidelink communications ue, or the one third ue transmits the placeholder signal for a plurality of sidelink communications ues. The embodiments of the invention are not limited thereto.

Specifically, after an occupancy signal is sent for a certain number of times within a certain time, when the occupancy signal is sent next, the occupancy signal is adjusted based on a sixth preset rule; wherein the sixth preset rule comprises at least one of:

(1) Reducing a duration of a single transmission of the occupancy signal;

(3) Reducing the transmit power of the occupancy signal;

It should be noted that, in this embodiment, an implementation process of adjusting the occupancy based on the sixth preset rule is the same as the implementation process of adjusting the occupancy based on the fourth preset rule. Therefore, the description thereof is omitted.

With continuing reference to fig. 5, according to yet another aspect of the present invention, an embodiment of the present invention provides a channel access method based on sidelink communication of an unlicensed frequency band, where the method is used for a sidelink communication user equipment, and the method includes:

sensing and selecting target resources of an unauthorized frequency band for performing side-chain communication;

carrying out LBT detection, and after the LBT detection is successful, executing the following steps:

Specifically, the time domain resource information for performing the LBT detection by the sidelink communications ue performing the sidelink communications according to the LBT control information is, for example: the side chain communication user equipment implements a start time T1 and an end time T2 of LBT detection, wherein T1< T2. The start time and the end time are in units of milliseconds, or frames, or subframes, or slots, or OFDM symbols. The time for performing LBT detection by the sideline communication user equipment may also be discontinuous, for example, the time period for LBT detection is from a start time T1 to an end time T1+ a, and from the start time T1+ b to an end time T2, where T1< T1+ a < T1+ b < T2.

The frequency domain resource information of the sidelink communication ue performing LBT detection according to the LBT control information is, for example: the side chain communication user equipment implements a starting frequency domain position F1 and an ending frequency domain position F2 of LBT detection, where F1< F2. The start frequency domain and the end frequency domain are in units of a Bandwidth (BW), or a partial Bandwidth (BWP), or a Sub-channel (Sub-channel), or a Physical Resource Block (PRB), or a Subcarrier (Subcarrier). The frequency domain resources for performing LBT detection by the side chain communication user equipment may also be discontinuous, for example, the frequency domain resources for performing LBT detection are a starting frequency domain position F1 to an ending frequency domain position F1+ c, and a starting frequency domain position F1+ d to an ending frequency domain position F2, where F1< F1+ c < F1+ d < F2.

The beam information for performing the LBT detection by the sidelink communications ue according to the LBT control information is, for example: when the sidechain communication uses the millimeter wave communication, the LBT control information also includes information on the beam used, such as the beam width, the beam direction, and the like.

And when the side chain communication user equipment for side chain communication carries out LBT detection according to the LBT control information, judging the relevant information of the idle and busy state of the channel. Specifically, since the third ue will send the occupancy signal to prevent users of other communication systems from accessing the channel, the sidechain communication ue will detect the energy of the occupancy signal when performing LBT detection. When the energy of the occupancy signal exceeds a certain threshold, according to the current LBT detection mechanism, the side-chain communication user equipment can judge that the channel is busy, so that the LBT detection fails and the channel cannot be accessed. To prevent this, the third user equipment needs to indicate the power of the sidelink communication user equipment occupancy signal and the time-frequency resources used by the occupancy signal. The time frequency resource used by the occupancy signal may be the same as the time frequency resource to be monitored when the side chain communication user equipment performs LBT, or may be different from the time frequency resource to be monitored when the side chain communication user equipment performs LBT. For example, the occupancy signal is sent in the time period [ T1, T2], but the third user equipment indicates that the side chain communication user equipment only needs to listen to the signal within the detection time period [ T1+ a, T2-b ] (T1 < T1+ a < T2-b < T2). For example, the occupancy signal is sent in the frequency domain location [ F1, F2], but the third user equipment indicates that the side chain communication user equipment only needs to listen for signals within a detection time period of [ F1+ a, F2-b ] (F1 < F1+ a < F2-b < F2).

The following description will exemplarily describe the technical solution of the present invention by the following examples according to the above-described channel access method based on unlicensed band sidelink communication and the operation flow of the channel access method based on unlicensed band sidelink communication.

Example 1

As shown in fig. 7, the sidelink communication user equipment selects the sidelink resource at time t1 and reserves the target resource at time t 4. And then the side chain communication user equipment transmits the occupancy signal from t2 to t 3. The placeholder signal has a power P. When the WiFi user LBT detection threshold is Pth (Pth < P), the WiFi user LBT detection fails. The sidelink communication user equipment uses the sidelink communication resource at the time t4 for the sidelink communication.

Example two

As shown in fig. 8, the sidelink communication user equipment selects the sidelink resource at time t1 and reserves the target resource at time t 6. And then the side chain communication user equipment transmits 1 occupancy signal at the time point from t2 to t3 and transmits 2 occupancy signals at the time point from t4 to t 5. The placeholder signal has a power P. When the WiFi user LBT detection threshold is Pth (Pth < P), the WiFi user LBT detection fails. The sidelink communication user equipment uses the sidelink communication resource at the time t6 for the sidelink communication.

Example three

As shown in fig. 9, the sidelink communication user equipment selects the sidelink resource at time t1 and reserves the target resource at time t 6. Then the side chain communication user equipment sends 1 time of occupancy signal at the time from t2 to t3, and the power of the occupancy signal is P; and transmitting the occupancy signal for 2 times from t4 to t5, wherein the power of the occupancy signal is P1. When the WiFi user LBT detection threshold is Pth (Pth < P1), wiFi user LBT detection fails. The sidelink communication user equipment uses the sidelink communication resource at the time t6 for the sidelink communication.

Example four

As shown in fig. 10, after scheduling resources for the side-chain communication user equipment, the first user equipment sends downlink occupancy signals in the beam directions of θ 1 and θ 2, respectively. The WiFi user LBT detection that receives the θ beam direction occupancy signal fails. And the side chain communication user equipment performs side chain communication with another side chain communication user equipment by using the side chain communication resource.

Example five

As shown in fig. 11, the first sidelink ues performs SCI scheduling at time t1, and transmits the resource for sidelink communications and LBT control information at time t4 for the second sidelink ues. The first sidelink communications user equipment then transmits the occupancy signal at time t2 to t 3. The placeholder signal has a power P. When the LBT detection threshold of the WiFi user is Pth (Pth > P), the WiFi user carries out communication after the LBT detection is successful. Therefore, the LBT detection of the second side-chain communication user equipment fails and the result of the LBT failure is fed back. And then the first sidechain communication user equipment reschedules the resource at the time t7 so that the first sidechain communication user equipment can carry out sidechain communication. The downlink occupancy signal is then sent at time t5 to t6, and the power of the occupancy signal is P (Pth < P). And then, as the occupied signal power is greater than the LBT detection threshold of the WiFi user, the LBT detection of the second side chain communication user equipment is successful and the side chain communication resource at the time t7 is used for side chain communication.

According to another aspect of the present invention, an embodiment of the present invention provides a channel access apparatus for sidelink communication based on an unlicensed frequency band.

As shown in fig. 12, the apparatus is used for a sidelink communications user equipment, and specifically, the apparatus 200 includes:

a sensing and selecting module 210, configured to sense and select a target resource of an unlicensed frequency band for performing side-chain communication;

a detecting and executing module 220, configured to perform LBT detection, and after LBT detection is successful, execute the following steps:

(3) And performing side-chain communication on the target resource.

In the apparatus 200, the sidelink communications user equipment sends the occupancy signal associated with the target resource before the target start time indicated by the target resource by itself, and it is ensured that other user equipment or other communications systems (e.g., wiFi) will fail in LBT detection, so that not only the LBT detection success rate of the sidelink communications user equipment is improved, but also the sidelink communications user equipment can be ensured to normally perform sidelink communications at the time of the selected unlicensed frequency band, and the channel access success rate of the sidelink communications user equipment is improved.

It should be understood that other aspects and effects of the apparatus can be found in the foregoing channel access method based on unlicensed band sidelink communication, and are not described herein again.

Fig. 13 is a block diagram illustrating a channel access apparatus for unlicensed band based sidelink communication according to yet another embodiment of the present invention.

As shown in fig. 13, the apparatus is used for a first user equipment, and specifically, the apparatus 300 includes:

a receiving module 310, configured to receive resource scheduling request information of an unlicensed frequency band from a sidelink communication user equipment;

a generating and sending module 320, configured to sense and select, for the resource scheduling request information, a target resource of a corresponding unlicensed frequency band to generate resource scheduling information and LBT control information, implement LBT detection, and send the resource scheduling information and the LBT control information to the sidelink communication user equipment after LBT detection is successful, where the LBT control information at least includes information used to indicate a placeholder signal to be listened by the sidelink communication user equipment when LBT detection is implemented;

a placeholder signal sending module 330, configured to send a placeholder signal associated with the target resource before the target start time indicated by the target resource.

As shown in fig. 14, the apparatus is for a sidelink communications user equipment, and specifically, the apparatus 400 includes:

a sending module 410, configured to send resource scheduling request information of an unlicensed frequency band;

a receiving module 420, configured to receive resource scheduling information and LBT control information from other ue, where the LBT control information at least includes information indicating an occupancy signal to be listened to when performing LBT detection, and the resource scheduling information at least includes a target resource of an unlicensed frequency band for the sidelink communication ue to perform sidelink communication;

a detecting and executing module 430, configured to perform LBT detection according to the LBT control information, and listen to the occupancy signal, and after LBT detection is successful, execute the following steps:

(2) And performing side-chain communication on the target resource.

As shown in fig. 15, the apparatus is for a third user equipment, and specifically, the apparatus 500 includes:

a receiving module 510, configured to receive resource reservation information of an unlicensed frequency band from a sidelink communication user equipment, where the resource reservation information indicates a target resource that needs to be reserved;

a generating and sending module 520, configured to generate corresponding LBT control information based on the resource reservation information, and send the LBT control information to the side-chain communication user equipment, where the LBT control information at least includes information used to indicate an occupancy signal to be listened by the side-chain communication user equipment when performing LBT detection;

a placeholder signal sending module 530, configured to send a placeholder signal associated with the target resource before the target start time indicated by the target resource.

As shown in fig. 16, the apparatus is used for a sidelink communications user equipment, and specifically, the apparatus 600 includes:

a sensing and selecting module 610, configured to sense and select a resource of an unlicensed frequency band for performing side-chain communication;

a detecting and executing module 620, configured to perform LBT detection, and after LBT detection succeeds, execute the following steps:

In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and the computer program is executed by a processor to implement any of the above-described channel access methods based on unlicensed band sidelink communication.

For specific limitations and implementation of the above steps, reference may be made to an embodiment of a channel access method based on unlicensed frequency band side-chain communication, which is not described herein again.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

The channel access method, device and storage medium based on unlicensed band side-chain communication provided by the embodiments of the present invention are introduced in detail above, and a specific example is applied in this document to explain the principle and implementation of the present invention, and the description of the above embodiments is only used to help understanding the technical solution and its core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A channel access method based on unlicensed band sidechain communication is used for sidechain communication user equipment, and is characterized in that the method comprises the following steps:

(3) And performing side-chain communication on the target resource.

2. The method for channel access based on unlicensed band sidelink communication as claimed in claim 1, wherein said transmitting a placeholder signal associated with said target resource before a target start time indicated by said target resource comprises:

(1) Time domain resource information associated with the occupancy signal;

(2) Frequency domain resource information associated with the occupancy signal;

(3) Power information associated with the occupancy signal;

(4) Beam information associated with the occupancy signal.

3. The method for channel access based on sidelink communication of unlicensed frequency band as claimed in claim 1, wherein said method further comprises:

limiting the occupancy signal sent by the side-chain communication user equipment based on a first preset rule;

wherein the first preset rule comprises at least one or a combination of the following items:

(1) A total duration of the occupancy signal transmitted;

(2) A frequency threshold of the transmitted occupancy signal;

(3) A maximum power value of the transmitted occupancy signal;

(4) The transmitted occupancy signal beam-related parameters.

4. The method for channel access based on unlicensed band sidelink communication as claimed in claim 3, wherein said method further comprises:

adjusting the occupancy signal sent by the side-chain communication user equipment based on a second preset rule;

wherein the second preset rule comprises at least one of:

(1) Increasing a transmit power of the occupancy signal;

(2) Increasing a duration of transmitting the occupancy signal;

(3) Increasing the number of beams transmitting an occupancy signal

(4) The width of the beam used to transmit the occupancy signal is increased.

5. A channel access method based on unlicensed band sidechain communication is used for a first user equipment, and is characterized in that the method comprises the following steps:

receiving resource scheduling request information of an unauthorized frequency band from side-chain communication user equipment;

for the resource scheduling request information, sensing and selecting target resources of a corresponding unlicensed frequency band to generate resource scheduling information and LBT control information, implementing LBT detection, and sending the resource scheduling information and the LBT control information to the side-chain communication user equipment after LBT detection is successful, wherein the LBT control information at least includes information for indicating an occupancy signal to be listened by the side-chain communication user equipment when LBT detection is implemented;

transmitting a placeholder signal associated with the target resource before a target start time indicated by the target resource.

6. The channel access method for unlicensed band sidelink communication according to claim 5,

the information of the occupancy signal at least comprises time-frequency resources used by the occupancy signal and power information.

7. The channel access method for unlicensed band sidelink communication according to claim 6,

at least one time period during which the transmitted occupancy signal lasts overlaps at least one time period during which the sidechain communication user equipment performs LBT detection.

8. The channel access method for unlicensed band sidelink communication according to claim 5,

the LBT control information further includes one or more of time domain resource information, frequency domain resource information, beam information, and information for determining channel idle and busy states, where the side chain communication user equipment performing side chain communication performs LBT detection.

9. The method for channel access based on unlicensed band sidelink communication as claimed in claim 5, wherein said method further comprises:

limiting the transmitted occupancy signal based on a third preset rule;

wherein the third preset rule comprises at least one or a combination of the following:

(1) A total duration of the occupancy signal transmitted;

(2) A frequency threshold of the transmitted occupancy signal;

(3) A maximum power value of the transmitted incumbent signal;

(4) The transmitted beam-related parameters of the occupancy signal.

10. The method for channel access based on unlicensed band sidelink communication as claimed in claim 9, said method further comprising:

adjusting the transmitted occupancy signal based on a fourth preset rule;

wherein the fourth preset rule comprises at least one of:

(1) Reducing a duration of a single transmission of the occupancy signal;

(3) Reducing the transmit power of the occupancy signal;

11. A channel access method based on unlicensed band sidechain communication is used for sidechain communication user equipment, and is characterized in that the method comprises the following steps:

receiving resource scheduling information and LBT control information from other user equipment, wherein the LBT control information at least comprises information indicating a placeholder signal to be monitored when LBT detection is carried out, and the resource scheduling information at least comprises target resources of an unlicensed frequency band for the sidechain communication user equipment to carry out sidechain communication;

(2) Performing sidelink communications on the target resource.

12. A channel access method for sidelink communication based on unlicensed frequency band, which is used in a third user equipment, and the method comprises:

receiving resource reservation information of an unauthorized frequency band from side-chain communication user equipment, wherein the resource reservation information indicates target resources needing to be reserved;

generating corresponding LBT control information based on the resource reservation information, implementing LBT detection, and sending the LBT control information to the side chain communication user equipment after the LBT detection is successful, wherein the LBT control information at least comprises information used for indicating an occupancy signal to be intercepted by the side chain communication user equipment when the LBT detection is implemented;

13. The channel access method for unlicensed band sidelink communication according to claim 12,

14. The method for channel access based on unlicensed band sidelink communication as claimed in claim 13,

at least one time period during which the transmitted occupancy signal lasts at least overlaps with at least one time period during which the sidechain communication user equipment performs LBT detection.

15. The channel access method for unlicensed band sidelink communication according to claim 12,

16. The method for channel access based on unlicensed band sidelink communication as claimed in claim 12, said method further comprising:

limiting the transmitted occupancy signal based on a fifth preset rule;

wherein the fifth preset rule comprises at least one or a combination of the following:

(1) A total duration of the occupancy signal transmitted;

(2) A frequency threshold of the transmitted occupancy signal;

(3) A maximum power value of the transmitted occupancy signal;

(4) The transmitted occupancy signal beam-related parameters.

17. The method for channel access based on unlicensed band sidelink communication as claimed in claim 14, said method further comprising:

adjusting the transmitted occupancy signal based on a sixth preset rule;

wherein the sixth preset rule comprises at least one of:

(1) Reducing a duration of a single transmission of the occupancy signal;

(3) Reducing the transmit power of the occupancy signal;

18. A channel access method based on unlicensed band sidechain communication is used for sidechain communication user equipment, and is characterized in that the method comprises the following steps:

performing an LBT test, and after the LBT test is successful, performing the following steps:

19. A channel access apparatus for sidelink communication based on unlicensed frequency band, which is used for a sidelink communication user equipment, the apparatus comprising:

(3) Performing sidelink communications on the target resource.

20. A channel access apparatus for sidelink communication based on unlicensed frequency band, configured for a first user equipment, the apparatus comprising:

a generating and sending module, configured to sense and select, for the resource scheduling request information, a target resource of a corresponding unlicensed frequency band to generate resource scheduling information and LBT control information, implement LBT detection, and send the resource scheduling information and the LBT control information to the side-chain communication user equipment after LBT detection is successful, where the LBT control information at least includes information for indicating an occupancy signal to be listened by the side-chain communication user equipment when LBT detection is implemented;

and a placeholder signal sending module, configured to send a placeholder signal associated with the target resource before a target start time indicated by the target resource.

21. A channel access apparatus for sidelink communication based on unlicensed frequency band, which is used for a sidelink communication user equipment, the apparatus comprising:

(2) Performing sidelink communications on the target resource.

22. A channel access apparatus for sidelink communication based on unlicensed frequency band, which is used for a third user equipment, the apparatus comprising:

a generating and sending module, configured to generate corresponding LBT control information based on the resource reservation information, and send the LBT control information to the sidechain communication user equipment, where the LBT control information at least includes information used to indicate an occupancy signal to be listened by the sidechain communication user equipment when performing LBT detection;

23. A channel access apparatus for sidelink communication based on unlicensed frequency band, configured to a sidelink communication user equipment, the apparatus comprising:

the sensing and selecting module is used for sensing and selecting the resources of the unauthorized frequency band for performing the side-chain communication;

24. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when executed by a processor, the computer program implements the channel access method based on unlicensed band sidelink communication according to any one of claims 1 to 4.

25. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when executed by a processor, the computer program implements the channel access method based on unlicensed band sidelink communication according to any one of claims 5 to 10.

26. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when executed by a processor, the computer program implements the channel access method based on unlicensed frequency band sidelink communication according to claim 11.

27. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when executed by a processor, the computer program implements the channel access method based on unlicensed frequency band sidelink communication according to any one of claims 12 to 17.

28. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when executed by a processor, the computer program implements the channel access method based on unlicensed frequency band sidelink communication according to claim 18.