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

Abstract

The invention discloses a channel access method, device and storage medium for side chain communication based on an unlicensed frequency band. The method realizes: the side chain communication user equipment uses itself or other user equipment to indicate the target in the target resource. Send the occupancy signal associated with the target resource before the start time to ensure that other user equipment or other communication systems (such as WiFi) will fail when performing LBT detection, and cannot seize resources in the unlicensed frequency band, thereby not only improving this side. The LBT detection success rate of the chain communication user equipment can also ensure that the side chain communication user equipment can normally perform side chain communication at the moment of the selected unlicensed frequency band, which improves the channel access success rate of the side chain communication user equipment.

Description

Channel access method, device and storage of side chain communication based on unlicensed frequency band medium

technical field

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

Background technique

NR (New Radio, new air interface) side chain communication refers to end users (such as mobile phone users, or vehicle-mounted equipment, or D2D (Device-to-Device) equipment, or IoT equipment, or portable equipment, etc.), not via the base station technology to communicate with each other. 3GPP release17 standardized the NR-SL (New Radio-SideLink) communication based on the licensed frequency band.

For resource scheduling of side chain communication, NR side chain communication supports two modes:

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

Mode 2 (mode2): Users of side chain communication judge the available side chain communication resources in the side chain communication resource pool through sensing (Sensing), so as to select resources for this side chain communication and reserve resources for future communication.

In addition, NR side chain communication also derives a new resource scheduling method. For example, users of side chain communication can have resources for side chain communication scheduled by other users. Or when the user of the side chain communication uses mode 2 to select communication resources, the auxiliary information provided by other users is obtained, including preferred resources (Preferred resource) or non-preferred resources (Non-Preferred resource) for resource selection.

NR side chain communication includes three communication methods: broadcast, multicast, and unicast. For multicast and unicast, the receiver of the sidechain communication sends HARQ feedback depending on whether the feedback procedure is activated or not.

The channel access procedure and method of NR-U (New Radio-Unlicence, new air interface unlicensed spectrum) has been standardized in 3GPP protocol TS37.213. In order to use the unlicensed spectrum fairly, the channel access mainly determines the idle/busy state of the channel through the technology of Listen Before Talk (LBT). Communication nodes (including base stations and end users) need to confirm that the channel is idle through LBT before they can access the channel to use resources in the unlicensed frequency band.

Downlink transmission in NR-U defines two channel access methods: Type1 and Type2. In Type1, downlink transmission is initiated by the base station itself. In Type 2, the downlink transmission of the base station will follow an uplink transmission, and there is a time gap between the uplink and downlink, which can be 25us (Type 2A) or 16us (Type2B). In Type2, the uplink and downlink transmission will share the channel (Shared channel occupancy) within a certain period of time.

Uplink transmission in NR-U defines two channel access methods: Type1 and Type2. In Type 1, the base station schedules users to transmit uplink control channels, or schedules users to transmit uplink shared channels, or schedules users to request resources, or sends random access signals. In Type 2, users scheduled by the base station directly perform Type 2 channel access.

Exemplarily, Scenario 1: As shown in FIG. 1 , a sidechain communication user (UE) selects a sidechain communication resource at time t4 through sensing (sensing) at time t1 . Between time t2 and t3 after the sidechain communication user selects the sidechain communication resource but before the actual sidechain communication transmission, the WiFi device successfully accesses the channel for communication. Users performing sidechain communication perform LBT (Listen Before Talk) detection before actual sidechain communication transmission (before time t4). Since the communication of the WiFi user causes the user of the side chain communication to detect that the channel is in a busy state (Busy), the LBT detection of the user of the side chain communication fails.

Exemplarily, Scenario 2: As shown in FIG. 2 , user 1 (UE1) of side chain communication selects a side chain communication resource at time t3 through sensing at time t1, and user 2 (UE2) of side chain communication selects a resource for side chain communication at time t2 The side chain communication resource at time t4 is selected through sensing at any time. After the LBT detection process of UE1 succeeds, it selects side chain communication resources to perform side chain communication at time t3. However, UE2 will perform LBT detection before actual side chain communication transmission. Due to the communication of UE1, UE2 detects that the channel is in a busy state (Busy), so the LBT detection of UE2 fails.

The above two application scenarios will lead to the following problems:

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

(2) If users of side chain communication still need to communicate, they need to reacquire resources, which increases the communication delay of users of side chain communication.

Contents of the invention

In view of the above defects of the prior art, the present invention provides a channel access method, device and storage medium for side chain communication based on unlicensed frequency bands, to solve the problem of channel access of side chain communications based on unlicensed frequency bands in the prior art. The access success rate is not high.

In order to achieve the above object, an embodiment of the present invention provides a channel access method for side chain communication based on an unlicensed frequency band, which is used for a side chain communication user equipment, and the method includes: sensing and selecting an unlicensed channel for side chain communication The target resources of the authorized frequency band; implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) sending an occupancy signal associated with the target resource before the target start time indicated by the target resource;

(3) Perform side chain communication on the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access method for side chain communication based on an unlicensed frequency band, which is used for a first user equipment, and the method includes: receiving a channel from a side chain communication user The resource scheduling request information of the unlicensed frequency band of the device; for the resource scheduling request information, perceive and select the target resource of the corresponding unlicensed frequency band to generate resource scheduling information and LBT control information, implement LBT detection, and after the LBT detection is successful sending the resource scheduling information and the LBT control information to the side chain communication user equipment, wherein the LBT control information at least includes information for instructing the side chain communication user equipment to listen to when performing LBT detection. information of the occupancy signal; sending the occupancy signal associated with the target resource before the target start time indicated by the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access method for side chain communication based on an unlicensed frequency band, which is used for a side chain communication user equipment, and the method includes: sending an unlicensed frequency band Resource scheduling request information; receiving resource scheduling information and LBT control information from other user equipments, wherein the LBT control information at least includes information indicating occupancy signals to be listened to when implementing LBT detection, and the resource scheduling information at least Including the target resources of the unlicensed frequency band for the side chain communication user equipment to perform side chain communication; implement LBT detection and listen to the occupancy signal according to the LBT control information, and perform the following steps after the LBT detection is successful:

(1) sending resource reservation information, wherein the resource reservation information indicates target resources that need to be reserved;

(2) Perform side chain communication on the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access method for side chain communication based on an unlicensed frequency band, which is used for a third user equipment, and the method includes: receiving a channel from a side chain communication user Resource reservation information of the unlicensed frequency band of the device, wherein the resource reservation information indicates the target resource that needs to be reserved; based on the resource reservation information, corresponding LBT control information is generated, and LBT detection is implemented, and the LBT After the detection is successful, the LBT control information is sent to the side chain communication user equipment, wherein the LBT control information at least includes an occupancy for instructing the side chain communication user equipment to listen to when performing LBT detection. Information about the signal: sending the occupancy signal associated with the target resource before the target start time indicated by the target resource.

According to another aspect of the present invention, an embodiment of the present invention also provides a channel access method for side chain communication based on an unlicensed frequency band, which is used for a side chain communication user equipment, and the method includes: sensing and selecting to perform side chain communication The target resource of the unlicensed frequency band of the chain communication; implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) receiving LBT control information from other user equipments, wherein the LBT control information at least includes information indicating an occupancy signal to be listened to when performing LBT detection before starting sidechain communication;

(3) implementing LBT detection according to the LBT control information and listening to the occupancy signal;

(4) After the LBT detection succeeds, perform side chain communication on the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access device for side chain communication based on an unlicensed frequency band, which is used for side chain communication user equipment, and the device includes:

The perception and selection module is used to perceive and select the target resources of the unlicensed frequency band for side chain communication;

The detection and execution module is used to implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) sending an occupancy signal associated with the target resource before the target start time indicated by the target resource;

(3) Perform side chain communication on the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access device for side chain communication based on an unlicensed frequency band, which is used for a first user equipment, and the device includes:

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

The generating and sending module is used to perceive and select the target resource of the corresponding unlicensed frequency band for the resource scheduling request information to generate resource scheduling information and LBT control information, implement LBT detection, and send the resource to the resource after the LBT detection is successful. sending the scheduling information and the LBT control information to the side chain communication user equipment, wherein the LBT control information at least includes an occupancy signal for instructing the side chain communication user equipment to listen to when performing LBT detection Information;

An occupancy signal sending module, configured to send an occupancy signal associated with the target resource before the target start time indicated by the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access device for side chain communication based on an unlicensed frequency band, which is used for side chain communication user equipment, and the device includes:

A sending module, configured to send resource scheduling request information in an unlicensed frequency band;

A receiving module, configured to receive resource scheduling information and LBT control information from other user equipments, wherein the LBT control information at least includes information indicating occupancy signals to be intercepted when implementing LBT detection, and the resource scheduling information at least including target resources of an unlicensed frequency band used for the sidechain communication user equipment to perform sidechain communication;

The detection and execution module is used to implement LBT detection and listen to the occupancy signal according to the LBT control information, and perform the following steps after the LBT detection is successful:

(1) sending resource reservation information, wherein the resource reservation information indicates target resources that need to be reserved;

(2) Perform side chain communication on the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access device for side chain communication based on an unlicensed frequency band, which is used for a third user equipment, and the device includes:

A receiving module, configured to receive resource reservation information from an unlicensed frequency band of a sidechain communication user equipment, wherein the resource reservation information indicates target resources that need 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, wherein the LBT control information includes at least Information for instructing the side chain communication user equipment to listen to occupancy signals when performing LBT detection;

An occupancy signal sending module, configured to send an occupancy signal associated with the target resource before the target start time indicated by the target resource.

According to yet another aspect of the present invention, an embodiment of the present invention also provides a channel access device for side chain communication based on an unlicensed frequency band, which is used for side chain communication user equipment, and the device includes:

The perception and selection module is used to sense and select the resources of the unlicensed frequency band for side chain communication;

The detection and execution module is used to implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) receiving LBT control information from other user equipments, wherein the LBT control information at least includes information indicating an occupancy signal to be listened to when performing LBT detection before starting sidechain communication;

(3) implementing LBT detection according to the LBT control information and listening to the occupancy signal;

(4) After the LBT detection succeeds, perform side chain communication on the target resource.

According to another aspect of the present invention, the present invention also provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, any of the above-mentioned A channel access method for side chain communication based on an unlicensed frequency band.

In the channel access method, device, and storage medium for sidechain communication based on unlicensed frequency bands provided by the present invention, the method realizes that: the sidechain communication user equipment starts from the target resource indicated by itself or other user equipment Send the occupancy signal associated with the target resource before the start time to ensure that other user equipment or other communication systems (such as WiFi) will fail when performing LBT detection, and cannot seize resources in the unlicensed frequency band, thereby not only improving the side chain The LBT detection success rate of the communication user equipment can also ensure that the side chain communication user equipment can normally perform side chain communication at the moment of the selected unlicensed frequency band, which improves the channel access success rate of the side chain communication user equipment.

Description of drawings

The technical solutions and other beneficial effects of the present invention will be apparent through the detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

FIG. 1 shows a schematic diagram of a channel access scenario of side chain communication based on an unlicensed frequency band in a common technology.

FIG. 2 shows a schematic diagram of another channel access scenario of side chain communication based on an unlicensed frequency band in a common technology.

Fig. 3 shows a schematic flowchart of a channel access method for side chain communication based on an unlicensed frequency band provided by an embodiment of the present invention.

FIG. 4 is a schematic diagram of an operation flow of a channel access method for sidechain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

Fig. 5 shows a schematic diagram of an operation flow of a channel access method for sidechain communication based on an unlicensed frequency band according to yet another embodiment of the present invention.

FIG. 6 shows a schematic diagram of an operation flow of a channel access method for sidechain communication based on an unlicensed frequency band according to yet another embodiment of the present invention.

FIG. 7 shows a schematic diagram of channel access for sidechain communication based on an unlicensed frequency band provided by Example 1 of the present invention.

FIG. 8 shows a schematic diagram of channel access for sidechain communication based on an unlicensed frequency band provided by Example 2 of the present invention.

FIG. 9 shows a schematic diagram of channel access for sidechain communication based on an unlicensed frequency band provided by Example 3 of the present invention.

FIG. 10 shows a schematic diagram of channel access for sidechain communication based on an unlicensed frequency band provided by Example 4 of the present invention.

FIG. 11 shows a schematic diagram of channel access for sidechain communication based on an unlicensed frequency band provided by Example 5 of the present invention.

Fig. 12 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band according to an embodiment of the present invention.

Fig. 13 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

Fig. 14 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

Fig. 15 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

Fig. 16 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

The terms "first", "second", "third", etc. (if any) in the description and claims of the present invention and the drawings are used to distinguish similar objects and not necessarily to describe a specific order or sequence . It should be understood that the items so described are interchangeable under appropriate circumstances. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined. 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 drawings are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, or in one or more hardware circuits or integrated circuits, or in different network and/or processor means and/or microindicator means.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In order to make the purpose, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The user equipment involved in the embodiments of the present invention is also referred to as a communication terminal, which is a device that provides voice and/or data connectivity to the user. The communication terminal may be a mobile terminal, such as a mobile phone (or called a "cellular" phone ) and computers with mobile terminals, such as portable, pocket, hand-held, computer built-in or vehicle-mounted mobile devices, which exchange speech and/or data with the radio access network. For example, the terminal device may also be a personal communication service (personal communication service, PCS) phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant ( personal digital assistant, PDA) and other equipment. Common communication terminals include, for example: mobile phones, tablet computers, notebook computers, palmtop computers, mobile internet devices (mobile internet device, MID), wearable devices, such as smart watches, smart bracelets, pedometers, etc., but the implementation of this application Examples are not limited to this. The communication terminal may communicate with one or more core networks through a radio access network (radio access network, RAN).

In view of this, the purpose of the present invention is to make full use of the allocated side chain communication resources and improve the channel access efficiency of the user equipment based on the unlicensed frequency band side chain communication. Therefore, it is particularly important to study a new channel access method for sidechain communication based on unlicensed frequency bands.

Embodiment one

Fig. 3 shows a schematic flowchart of a channel access method for side chain communication based on an unlicensed frequency band provided by an embodiment of the present invention.

Referring to FIG. 3 , the channel access method for sidechain communication based on an unlicensed frequency band provided by an embodiment of the present invention is used for a sidechain communication user equipment, and specifically includes the following steps:

Step S10, sensing and selecting a target resource in an unlicensed frequency band for sidechain communication;

Step S20, implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) sending an occupancy signal associated with the target resource before the target start time indicated by the target resource;

(3) Perform side chain communication on the target resource.

Steps S10 to S20 will be described in detail below.

In step S10, for resources in the unlicensed frequency band used for side chain communication, the sender of side chain communication performs resource scheduling. For example, the sender of side chain communication judges the unlicensed resources available in the side chain communication resource pool through perception The resource of the frequency band is selected as the target resource of the unlicensed frequency band for side chain communication this time and the target resource of the unlicensed frequency band for future side chain communication is reserved.

It should be noted that, in some embodiments of the present invention, according to whether the communication service of the side-chain communication user equipment is periodic, when selecting the target resource of the unlicensed frequency band for the side-chain communication this time, at the same time Reserve all the target resources in the unlicensed frequency band for side chain communication in the future.

In step S20, the side chain communication user equipment implements LBT detection to determine the relevant information of the channel's idle state. When the LBT detection is successful, it is determined that the channel is in an idle state. After the channel can be accessed, the following steps are performed:

(1) Sending resource reservation information, where the resource reservation information includes the target resource required by the sidechain communication user equipment to perform sidechain communication.

Exemplarily, in the embodiment of the present invention, the side chain communication user equipment uses side chain control information (SCI) to send resource reservation information, and the resource reservation information includes the information required by the side chain communication user equipment itself for side chain communication The time-frequency resource information of the target resource. Specifically, the side chain communication user equipment uses side chain control information (SCI) to send resource reservation information to broadcast to other user equipment (for example, 4G, 5G and other cellular network users) which target time it will use next. The resources in the frequency band are used for side chain communication, so that other user equipment can perceive the target resource and the use time for the target resource, so as to prevent the target resource from being preempted by other user equipment before starting to use the side chain communication.

(2) sending an occupancy signal associated with the target resource before the target start time indicated by the target resource;

Exemplarily, in the embodiment of the present invention, before the user equipment of side chain communication (transmitter of side chain communication) uses the selected unlicensed frequency band target resource for transmission, the user equipment of side chain communication will also send at least one occupancy signal, through the at least one occupancy signal to ensure that the sidechain communication user equipment (the sending end of the sidechain communication) can use the selected unlicensed frequency band target resource to perform the sidechain communication.

Optionally, in the embodiment of the present invention, the time-frequency resource and power used by the occupancy signal may be determined by the sidechain communication user equipment (sending end of the sidechain communication) itself.

In the embodiment of the present invention, sending the occupancy signal associated with the target resource means that 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 resource can be The corresponding target frequency band is occupied, so that the side chain communication user equipment sends the occupancy signal to ensure that other user equipment or other communication systems (such as WiFi) are in the It will fail when performing LBT detection, that is, to ensure that WiFi will not snatch resources before the transmission of the side chain communication user equipment (side chain communication user equipment) and cause the LBT detection of the side chain communication user equipment (side chain communication user equipment) fail.

(3) Side chain communication The user equipment (transmitter of side chain communication) performs side chain communication on the selected target resource.

It should be understood that, in this embodiment, since the sidechain communication user equipment sends the occupancy signal for itself, the time period for sending the occupancy time and the time period for performing LBT detection do not overlap.

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

The side chain communication user equipment sends the occupancy signal associated with the target resource before the target start time indicated by the target resource to ensure that other user equipment or other communication systems (such as WiFi) will fail when performing LBT detection, thereby It not only improves the LBT detection success rate of the side chain communication user equipment, but also ensures that the side chain communication user equipment can normally perform side chain communication at the moment of the selected unlicensed frequency band, and improves the channel of the side chain communication user equipment. Access success rate.

Further, the sending the occupancy signal associated with the target resource before the target start time indicated by the target resource includes:

determining parameter information associated with the occupancy signal, and sending the occupancy signal based on the parameter information, wherein the parameter information includes 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 occupancy signal, for example, the start time T1 and the end time T2 of the occupancy signal sent by the side chain communication user equipment, where T1<T2. The start time and end time are in units of milliseconds, or frames, or subframes, or time slots, or OFDM symbols. The time for the side chain communication user equipment to send the occupancy signal may also be discontinuous. For example, the time period for the side chain communication user equipment to send the occupancy signal is from the start time T1 to the end time T1+a, and the start time T1 Time T1+b to end time T2, wherein, T1<T1+a<T1+b<T2.

Specifically, the frequency domain resource information associated with the occupancy signal, for example, the start frequency domain position F1 and the end frequency domain position F2 of the occupancy signal sent by the sidechain communication user equipment, wherein F1<F2. The start frequency and the end frequency take bandwidth (BW), or partial bandwidth (BWP), or sub-channel (Sub-channel), or physical resource block (PRB), or sub-carrier (Subcarrier) as a unit. The frequency domain resource of the occupancy signal sent by the side chain communication user equipment may also be discontinuous, for example, the frequency domain resource of the occupancy signal sent by the side chain communication user equipment is from the start frequency domain position F1 to the end frequency domain The position F1+c, and the starting frequency domain position F1+d to the ending frequency domain position F2, wherein, F1<F1+c<F1+d<F2.

Specifically, the power information associated with the occupancy signal, for example, the transmission power of the occupancy signal sent by the sidechain communication user equipment. Specifically, the beam information associated with the occupancy signal, for example, when the side chain communication user equipment uses millimeter wave communication for side chain communication, the occupancy signal sent by the side chain communication user equipment also includes the correlation of the beam Information such as beam width, beam direction, etc.

Exemplarily, the parameter information associated with the occupancy signal may be indicated through downlink control information (Downlink control information, DCI) or RRC (Radio Resource Control, radio resource indication protocol) signaling of the base station.

Exemplarily, parameter information associated with the occupancy signal may also 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 prevent the cellular network system from occupying the resources of the unlicensed frequency band for a long time by sending an occupancy signal, the method further includes: the occupancy signal sent to the side chain communication user equipment itself based on a first preset rule Restrict; Wherein, the first preset rule includes at least one or a combination of the following items:

(1) The total duration of the occupancy signal sent;

(2) The frequency threshold of the occupancy signal sent;

(3) The maximum power value of the occupancy signal sent;

(4) Parameters related to the transmitted occupancy signal beam.

Regarding the total duration T _total of the transmitted occupancy signal, specifically, if the sidechain communication user equipment only sends the occupancy signal once within the time T, the occupancy signal lasts at most T _total . If the sidechain communication user equipment sends multiple occupancy signals within the time T, the sum of the durations of the multiple occupancy signals is at most T _total .

Regarding the frequency of sending the occupancy signal, specifically, for example, the side chain communication user equipment sends a maximum of M occupancy signals within a time T, or the side chain communication user equipment transmits a maximum of K occupancy signals within a time T bit signal.

Regarding the maximum power P of the transmitted occupancy signal, specifically, the maximum power P of the occupancy signal needs to ensure that users of other communication systems, such as WiFi users, determine that the channel is busy when performing LBT detection, so that they cannot access the channel.

Parameters related to the beam of the occupancy signal sent, specifically, the number of beams used to send the occupancy signal, or the beam used to send the occupancy signal is a beam in a certain direction or within a certain direction range, or the beam used to send the occupancy signal A beam is a beam of a certain beam width or within a certain width range.

Regarding the occupancy signal that is restricted to be sent by the above combination, for example, a combination of time and frequency of sending the occupancy signal is used to restrict the transmission of the occupancy signal. Specifically, the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn). Or the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn), and the number of occupancy signals sent in each time period is (K1, K2, ... Kn).

The sending of placeholder signals is restricted, for example, using a time and power combination for sending placeholder signals. Specifically, the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the maximum power of sending occupancy signals in each time period is (P1, P2, ...Pn).

For example, the time at which occupant signals are transmitted and beam combining are used to limit the transmission of occupant signals. Specifically, the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the beam directions for sending occupancy signals in each time period are (θ1, θ2, ...θn). Or the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the beamwidth of sending occupancy signals in each time period is (w1, w2, ... wn ).

For example, the frequency and power combination of sending placeholder signals is used to limit the sending of placeholder signals. Specifically, the side chain communication user equipment sends M times of place-occupancy signals within time T, and the maximum power of each time-occupied signal is (P1, P2, . . . Pm). Or the side chain communication user equipment sends K placeholder signals within a time T, and the maximum power of each placeholder signal is (P1, P2, . . . Pk).

For example, a combination of transmitted occupant signal power and beam-related parameters is used to limit the transmission of occupant signals. Specifically, the side chain communication user equipment sends occupancy signals in n beam directions (θ1, θ2, ... θn), and the maximum power of the occupancy signals sent in each beam direction is (P1, P2, ... Pn).

For example, the time, frequency and power combination of sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn), 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 sending the placeholder signal are used to limit the sending of the placeholder signal. Specifically, the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn), the beam direction of the occupancy signal sent each time in each corresponding time period is (θ1, θ2, . . . θn).

For example, a combination of time, power and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the maximum power of sending occupancy signals in each time period is (P1, P2, ...Pn), the beam direction of the occupancy signal sent each time in each corresponding time period is (θ1, θ2, ... θn).

For example, the frequency, power, and beam parameter combination of sending the placeholder signal are used to limit the sending of the placeholder signal. Specifically, the side chain communication user equipment sends M times of occupancy signals within time T, and the beam direction of the occupancy signals sent each time is (θ1, θ2,...θn), and the corresponding The maximum power is (P1,P2,...Pm).

For example, the time, frequency, power, and beam parameter combination of sending the placeholder signal are used to limit the sending of the placeholder signal. Specifically, the side chain communication user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn), the beam direction of the occupancy signal sent each time is (θ1, θ2, ... θn), and the corresponding maximum power of the occupancy signal sent each time is (P1, P2, ... Pm).

It should be understood that the foregoing parameters that limit the sending of the occupancy signal may also be adjusted. For example, when the LBT detection of the side chain communication user equipment fails, adjust the above-mentioned parameters that restrict the sending of the occupancy signal. Specifically, when the LBT detection of the side chain communication user equipment fails, at least one of the following adjustments may be made:

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

(2) Increase the duration of sending the occupancy signal;

(3) Increase the number of beams for sending occupancy signals;

(4) Increase the width of the beam used to transmit the occupancy signal.

Exemplarily, for example, the side chain communication user equipment sends an occupancy signal with power P, and the power detected by its LBT is greater than P _th , and P _th is a condition for the side chain communication user equipment to judge LBT success or failure. Specifically, when the signal strength detected by the side chain communication user equipment is greater than P _th , the LBT detection of the side chain communication user equipment fails, and the side chain communication user equipment cannot access the channel for communication. When the signal strength detected by the side chain communication user equipment does not exceed P _th , the LBT detection is successful, and the side chain communication user equipment can access the channel for communication. After the side chain communication user equipment fails the LBT detection, when sending the occupancy signal next time, the side chain communication user equipment can correspondingly increase the power of the occupancy signal to P'(P'>P), so that other communication systems The user LBT detection failed.

Exemplarily, for example, after the sidechain communication user equipment sends the occupancy signal within the time period T, it fails to perform the LBT detection in another time period T' before actually performing the sidechain communication. Then the side chain communication user equipment can determine that users of other communication systems have successfully accessed the channel within the time period T'. When sending the occupancy signal next time, the side chain communication user equipment may correspondingly increase the time period for sending the occupancy signal, so that the LBT detection of users in other communication systems fails.

Exemplarily, for example, the side chain communication user equipment sends an occupancy signal in the beam direction α1, but fails to perform LBT detection in the beam direction α2 before actually performing side chain communication, and the beam direction does not send an occupancy signal. Then the side chain communication user equipment can determine that there are users of other communication systems who have successfully accessed the channel in the direction of the beam direction α2. When sending the occupancy signal next time, the side chain communication user equipment may correspondingly increase the beams for sending the occupancy signal, so that the LBT detection of users in other communication systems fails.

Embodiment two

FIG. 4 is a schematic diagram of an operation flow of a channel access method for sidechain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

As shown in FIG. 4 , different from FIG. 3 , in this embodiment, the first user equipment sends an occupancy signal for a sidechain communication user equipment that is about to perform sidechain communication.

Exemplarily, firstly, the first user equipment receives the resource scheduling request information of the unlicensed frequency band from the side chain communication user equipment, and secondly, for the resource scheduling request information, the first user equipment perceives and selects the corresponding unlicensed frequency band Target resources 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 the LBT detection is successful, wherein the resource scheduling The information includes at least the target resource of the unlicensed frequency band used for the side chain communication user equipment to perform side chain communication, and the LBT control information includes at least a target resource used to indicate the side chain communication user equipment to detect when implementing LBT detection. listening to the information of the occupancy signal; then, sending the occupancy signal associated with the target resource before the target start time indicated by the target resource.

Exemplarily, in this embodiment, the first user equipment, as the sender of the occupation signal, can roughly be classified into the following three situations: In the first situation, the first user equipment may not communicate with any user equipment User equipment, in the second case, the first user equipment may be a user equipment performing side chain communication with the side chain communication user equipment, in the third case, the first user equipment may be a user equipment performing uplink communication with a base station .

For the first situation above, the first user equipment may additionally send a signal as a placeholder signal; for the second situation above, the first user equipment may send a placeholder signal while sending the sidechain signal, or Use the sent side chain signal as the occupancy signal; for the third situation above, the first user equipment may send an occupancy signal when sending the uplink signal, or use the transmitted uplink signal as the occupancy signal.

Specifically, in this embodiment, the first user equipment schedules the target resource of the unlicensed frequency band for the side chain communication user equipment and sends an occupancy signal. For example, in the groupcast mode (groupcast), the group leader is the group member scheduling side The target resource for sidechain communication; for example, in unicast mode (unicast), the sender schedules the target resource for sidechain communication for the receiver. For example, the first user equipment generates resource scheduling information and LBT control information, and then sends the resource scheduling information and the LBT control information to the side chain communication user equipment through side chain control information (SCI).

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

Further, there is at least an overlap between at least one time period during which the transmitted occupancy signal lasts and at least one time period during which the sidechain communication user equipment performs LBT detection.

Further, in this embodiment, the LBT control information also includes time-domain resource information, frequency-domain resource information, beam information and information used for judging the channel for the side-chain communication user equipment performing LBT detection. One or more of the free and busy status information.

It should be understood that, in this embodiment of the present invention, the time-frequency resource and power of the occupancy signal sent by the first user equipment and the time-frequency resource and power of the occupancy signal in the LBT control information sent by the first user equipment to the side chain communication user equipment The power information is the same.

Further, in the embodiment of the present invention, in order to prevent the cellular network system from occupying the resources of the unlicensed frequency band for a long time by sending an occupancy signal, the method further includes: sending to the first user equipment based on a third preset rule The placeholder signal of the is limited. Wherein, the third preset rule includes at least one or a combination of the following items:

(1) The total duration of the occupancy signal sent;

(2) The frequency threshold of the occupancy signal sent;

(3) The maximum power value of the occupancy signal sent;

(4) Parameters related to the transmitted occupancy signal beam.

Regarding the total duration T _total of the transmitted occupancy signal, specifically, if the first user equipment only sends the occupancy signal once within the time T, the occupancy signal lasts at most T _total . If the first user equipment sends multiple occupancy signals within the time T, the sum of the durations of the multiple occupancy signals is at most T _total .

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

Regarding the maximum power value of the occupancy signal sent, that is, the maximum power value of the occupancy signal needs to ensure that users of other communication systems, such as WiFi users, determine that the channel is busy when performing LBT detection, so that they cannot access the channel .

Parameters related to the beam of the occupancy signal sent, specifically, the number of beams used to send the occupancy signal, or the beam used to send the occupancy signal is a beam in a certain direction or within a certain direction range, or the occupancy signal is sent The beam used is a certain beam width or a beam within a certain width range.

Regarding the occupancy signal that is restricted to be sent by the above combination, for example, a combination of time and frequency of sending the occupancy signal is used to restrict the transmission of the occupancy signal. Specifically, the first user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) . Or the first user equipment sends occupancy signals in n time periods (T1, T2, ... Tn), and the number of occupancy signals sent in each time period is (K1, K2, ... Kn).

For example, the sending of placeholders is restricted using a combination of time and power at which placeholders are sent. Specifically, the first user equipment sends occupancy signals in n time periods (T1, T2,...Tn, n≥1), and the maximum power of sending occupancy signals in each time period is (P1, P2,...Pn ).

For example, the time at which the placeholders are sent and beam combining are used to limit the sending of placeholders. Specifically, the first user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the beam directions for sending occupancy signals in each time period are (θ1, θ2, ... θn ). Or the first user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the beamwidth of the occupancy signals in each time period is (w1, w2, ... wn).

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

For example, a combination of transmitted occupant signal power and beam-related parameters is used to limit the transmission of occupant signals. Specifically, the first user equipment sends occupancy signals in n beam directions (θ1, θ2, ... θn), and the maximum power of the occupancy signals sent in each beam direction is (P1, P2, ... Pn).

For example, a combination of time, frequency, and power for sending a placeholder signal is used to limit the sending of the placeholder signal. Specifically, the first user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) , the maximum power of the occupancy signal sent each time in each corresponding time period is (P1, P2, . . . Pn).

For example, a combination of time, frequency and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the first user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) , the beam direction of the occupancy signal sent each time in each corresponding time period is (θ1, θ2, . . . θn).

For example, a combination of time, power, and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the first user equipment sends occupancy signals in n time periods (T1, T2,...Tn, n≥1), and the maximum power of sending occupancy signals in each time period is (P1, P2,...Pn ), the beam directions of the occupancy signals sent each time in corresponding time periods are (θ1, θ2,...θn).

For example, a combination of frequency, power and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the first user equipment sends the occupancy signal M times within the time T, the beam direction of the occupancy signal sent each time is (θ1, θ2, ... θn), and the corresponding maximum power of the occupancy signal sent each time is is (P1,P2,...Pm).

For example, a combination of time, frequency, power and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the first user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) , the beam direction of the occupancy signal sent each time is (θ1, θ2, ... θn), and the corresponding maximum power of the occupancy signal sent each time is (P1, P2, ... Pm).

It should be understood that the foregoing parameters that limit the sending of the occupancy signal may also be adjusted. For example, when the LBT detection of the side chain communication user equipment fails, the first user equipment receives the reported information of the LBT detection failure of the side chain communication user equipment, and adjusts the above-mentioned restriction on sending the occupancy signal according to the reported information. various parameters. Specifically, because the LBT detection of the side chain communication user equipment fails, at least one of the following adjustments may be made:

(1) Increase the duration of sending the occupancy signal;

(2) Increase the number/frequency of sending occupancy signals;

(3) increasing frequency domain resources used for sending occupancy signals;

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

(5) Increase the number of beams for sending occupancy signals;

(6) Increase the width of the beam used to transmit the occupancy signal.

Further, if side chain communication is to be performed between the first user equipment and the side chain communication user equipment, then the first user equipment may determine whether the side chain communication user equipment has successfully sent the side chain communication service to it. Whether the LBT detection of the side chain communication user equipment is successful, specifically, if the first user equipment successfully receives the side chain communication service of the side chain communication user equipment, it is considered that the LBT detection of the side chain communication user equipment is successful.

It should be noted that the above-mentioned one first user equipment sends an occupancy signal for another sidechain communication user equipment, or the above-mentioned one first user equipment sends occupancy signals for multiple sidechain communication user equipments. The embodiments of the present invention are not limited here.

Further, the adjustment of the relevant parameters of the occupancy signal also includes reducing the success rate of channel access by side chain communication users to balance the utilization of unlicensed frequency bands by cellular network users and other communication system users.

Specifically, the first user equipment that sends the occupancy signal may also adjust the parameters of the occupancy signal according to the success or failure of the LBT detection fed back by the user equipment performing side chain communication. Specifically, when the LBT detection success rate of one side chain communication user equipment in the internal chain communication or the average LBT detection success rate of multiple side chain communication user equipments reaches a threshold X within a certain period of time, the The occupancy signal is adjusted; wherein, the fourth preset rule includes at least one of the following items:

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

(2) shortening the sum of the duration of sending the occupancy signal multiple times;

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

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

(5) Reduce the beam direction when using the beam to send the occupancy signal.

Specifically, the first user equipment that sends the occupancy signal may also set a counter for sending the occupancy signal. Specifically, the occupancy signal counter is incremented by 1 each time the occupancy signal is sent. When the occupancy signal sending times counter reaches a threshold Q1, start to adjust the parameters of the occupancy signal, and the specific adjustment method includes at least one of the following:

(1) shorten the duration of the occupancy signal sent once;

(2) shortening the sum of the duration of sending the occupancy signal multiple times;

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

(4) Reduce the frequency of sending occupancy signals within a certain period of time;

(5) Reduce the beam direction when using the beam to send the occupancy signal;

Specifically, every time the parameter of the occupancy signal is adjusted, the occupancy signal counter is decreased by 1. When the occupancy signal sending times counter reaches a threshold Q2, the parameters will not be adjusted when the occupancy signal is sent next time. Or adjust the parameters when sending the occupancy signal next time, as follows:

(1) Prolonging the duration of the occupancy signal sent once;

(2) Prolonging the sum of the duration of sending the occupancy signal multiple times;

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

(4) Increase the frequency of sending occupancy signals within a certain period of time;

(5) Increase the beam direction when using beams to send occupancy signals.

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 LBT success or failure fed back by the sidechain communication user equipment performing sidechain communication after adjustment. Specifically, when the LBT success rate of one sidechain communication user equipment in internal chain communication within a certain period of time, or the average LBT success rate of multiple sidechain communication user equipments is less than the threshold X, adjust the parameters of the occupancy signal. Specific adjustment methods include at least one of the following:

(1) Prolonging the duration of the occupancy signal sent once;

(2) Prolonging the sum of the duration of sending the occupancy signal multiple times;

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

(4) Increase the frequency of sending occupancy signals within a certain period of time;

(5) Increase the beam direction when using beams to send occupancy signals.

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

Send resource scheduling request information for unlicensed frequency bands;

Receive resource scheduling information and LBT control information from other user equipments, wherein the LBT control information includes at least information indicating the occupancy signal to be listened to when implementing LBT detection, and the resource scheduling information includes at least information for the side The target resource of the unlicensed frequency band for side chain communication user equipment to carry out side chain communication;

Implementing LBT detection and listening to the occupancy signal according to the LBT control information, and performing the following steps after the LBT detection is successful:

(1) sending resource reservation information, wherein the resource reservation information indicates target resources that need to be reserved;

(2) Perform side chain communication on the target resource.

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

The frequency domain resource information for the side chain communication user equipment performing LBT detection according to the LBT control information is, for example: the start frequency domain position F1 and the end frequency domain position F2 for the side chain communication user equipment to perform LBT detection , where F1<F2. The start frequency domain and the end frequency domain take bandwidth (BW), or partial bandwidth (BWP), or sub-channel (Sub-channel), or physical resource block (PRB), or subcarrier (Subcarrier) as a unit. The frequency domain resources for the side chain communication user equipment to implement LBT detection may also be discontinuous, for example, the frequency domain resources for implementing LBT detection are the starting frequency domain position F1 to the ending frequency domain position F1+c, and the starting frequency domain position F1 +d to the end frequency domain position F2, where F1<F1+c<F1+d<F2.

The beam information of the side chain communication user equipment performing side chain communication that performs LBT detection according to the LBT control information is, for example: when the side chain communication uses millimeter wave communication, the LBT control information also includes information about the used beam, such as beam Width, beam direction, etc.

When the side chain communication user equipment performing side chain communication performs LBT detection according to the LBT control information, it judges information related to the idle and busy state of the channel. Specifically, since the first user equipment sends an occupancy signal to prevent users of other communication systems from accessing channels, the side chain communication user equipment detects 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 will judge that the channel is busy, which will cause LBT detection failure and fail to access the channel. In order to prevent this situation, the first user equipment needs to indicate the power of the occupancy signal and the time-frequency resource used by the occupancy signal to the side chain communication user equipment. The time-frequency resources used by the occupancy signal may be the same as the time-frequency resources that the sidechain communication user equipment needs to listen to when performing LBT, or may be different from the time-frequency resources that need to be listened to when the sidechain 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 to the detection time period [T1+a, T2-b] (T1<T1+ a<T2-b<T2) within the signal. For example, the occupancy signal is sent in the frequency domain position [F1, F2], but the first user equipment indicates that the side chain communication user equipment only needs to listen to the detection period for [F1+a, F2-b] (F1< Signals within F1+a<F2-b<F2).

It should be understood that for the specific limitations, implementations, and effects of the above steps, refer to the content related to the above-mentioned channel access method for sidechain communication based on unlicensed frequency bands, and details will not be repeated here.

Embodiment three

Fig. 5 shows a schematic diagram of an operation flow of a channel access method for sidechain communication based on an unlicensed frequency band according to yet another embodiment of the present invention.

As shown in FIG. 5 , similar to FIG. 4 , in this embodiment, the third user equipment sends an occupancy signal for the sidechain communication user equipment that is about to perform sidechain communication. The difference from Figure 4 is that the sidechain communication device perceives and selects the target resources of the unlicensed frequency band available in the sidechain communication resource pool according to its own needs for sidechain communication, and then implements LBT detection, and after the LBT detection is successful The resource reservation information is sent to inform other user equipments of the target resources to be used when performing side chain communication. Usually, before sending resource reservation information and performing sidechain communication (sending sidechain communication data), the sidechain communication user equipment needs to perform LBT detection, and can only send after the LBT detection succeeds. However, the difference between these two LBT detections is that the first LBT detection performed by the side chain communication user equipment is based on the corresponding LBT parameters indicated by the base station (such as the time period for LBT detection, frequency domain position, beam-related parameters, power) The second implementation of LBT detection by the side chain communication user equipment is performed according to the parameters in the LBT control information received from the third user equipment.

Further, FIG. 6 shows a schematic diagram of an operation flow of a channel access method for side chain communication based on an unlicensed frequency band according to yet another embodiment of the present invention. In this embodiment, when the time difference between the end time of the third user equipment sending the occupancy signal associated with the target resource and the start time of the sidechain communication user equipment performing sidechain communication is less than a preset threshold, Then the sidechain communication user equipment can skip the step of implementing LBT detection based on the LBT control information received from the third user equipment, and directly perform sidechain communication.

Exemplarily, if the time difference between the end time of the third user equipment sending the occupancy signal associated with the target resource and the start time of the sidechain communication user equipment performing sidechain communication is less than the preset threshold Td, it should be considered The transmission of the occupancy signal can effectively prevent users of other communication systems (WiFi) from successfully performing LBT. Therefore, the side chain communication user equipment can think that even if a WiFi user tries to perform side chain communication within the time period selected by itself Communication, because of the existence of the occupancy signal sent by the third user equipment, the LBT detection of the WiFi user fails, so that the WiFi user cannot successfully access the channel. The LBT detection can be skipped and the side chain communication can be carried out directly. Optionally, the time difference Td of the above preset threshold may be sent by the base station through RRC signaling, or PDCCH (Physical Downlink Control Channel, downlink control channel), or PDSCH (Physical Downlink Shared Channel, downlink shared data channel), or SIB, or MIB for configuration.

Exemplarily, as shown in FIG. 5 , the implementation of the present invention provides a channel access method for side chain communication based on an unlicensed frequency band, which is used for a third user equipment. The method includes: first, the third user equipment receives an Resource reservation information of the unlicensed frequency band of the side chain communication user equipment, wherein the resource reservation information indicates the target resource that needs to be reserved; secondly, the third user equipment generates the corresponding LBT control based on the resource reservation information information, and send the LBT control information to the side chain communication user equipment, wherein the LBT control information at least includes an occupancy for instructing the side chain communication user equipment to listen to when performing LBT detection Information about the signal; then, sending the occupancy signal associated with the target resource before the target start time indicated by the target resource.

It should be noted that, in this embodiment, the third user equipment, as the sender of the occupation signal, can be roughly classified into the following three situations: In the first situation, the third user equipment may not communicate with any user equipment In the second case, the third user equipment may be a user equipment that performs side chain communication with the side chain communication user equipment. In the third case, the third user equipment may be a user that performs uplink communication with the base station equipment.

For the first situation above, the third user equipment may additionally send a signal as a placeholder signal; for the second situation above, the third user equipment may send a placeholder signal by the way when sending the sidechain signal, or Use the sent sidechain signal as the occupancy signal; for the third situation above, the third user equipment may send an occupancy signal while sending the uplink signal, or use the transmitted uplink signal as the occupancy signal.

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

Further, there is at least an overlap between at least one time period during which the transmitted occupancy signal lasts and at least one time period during which the sidechain communication user equipment performs LBT detection.

Further, in this embodiment, the LBT control information also includes time-domain resource information, frequency-domain resource information, beam information and information used for judging the channel for the side-chain communication user equipment performing LBT detection. One or more of the free and busy status information.

It should be understood that, in this embodiment of the present invention, the time-frequency resource and power of the occupancy signal sent by the third user equipment and the time-frequency resource and power of the occupancy signal in the LBT control information sent by the third user equipment to the side chain communication user equipment The power information is the same.

Further, in the embodiment of the present invention, in order to prevent the cellular network system from occupying the resources of the unlicensed frequency band for a long time by sending an occupancy signal, the method further includes: sending to the third user equipment based on a fifth preset rule The placeholder signal of the is limited. Wherein, the fifth preset rule includes at least one or a combination of the following items:

(1) The total duration of the occupancy signal sent;

(2) The frequency threshold of the occupancy signal sent;

(3) The maximum power value of the occupancy signal sent;

(4) Parameters related to the transmitted occupancy signal beam.

Regarding the total duration T _total of the sent occupancy signal, specifically, if the third user equipment only sends the occupancy signal once within the time T, the occupancy signal lasts at most T _total . If the third user equipment sends multiple occupancy signals within the time T, the sum of the durations of the multiple occupancy signals is at most T _total .

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

Regarding the maximum power value of the occupancy signal sent, that is, the maximum power value of the occupancy signal needs to ensure that users of other communication systems, such as WiFi users, determine that the channel is busy when performing LBT detection, so that they cannot access the channel .

Parameters related to the beam of the occupancy signal sent, specifically, the number of beams used to send the occupancy signal, or the beam used to send the occupancy signal is a beam in a certain direction or within a certain direction range, or the occupancy signal is sent The beam used is a certain beam width or a beam within a certain width range.

Regarding the occupancy signal that is restricted to be sent by the above combination, for example, a combination of time and frequency of sending the occupancy signal is used to restrict the transmission of the occupancy signal. Specifically, the third user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) . Or the third user equipment sends occupancy signals in n time periods (T1, T2, ... Tn), and the number of occupancy signals sent in each time period is (K1, K2, ... Kn).

For example, the sending of placeholders is restricted using a combination of time and power at which placeholders are sent. Specifically, the third user equipment sends occupancy signals in n time periods (T1, T2,...Tn, n≥1), and the maximum power of sending occupancy signals in each time period is (P1, P2,...Pn ).

For example, the time at which the placeholders are sent and beam combining are used to limit the sending of placeholders. Specifically, the third user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the beam directions for sending occupancy signals in each time period are (θ1, θ2, ... θn ). Or the third user equipment sends the occupancy signal in n time periods (T1, T2, ... Tn, n≥1), and the beamwidth for sending the occupancy signal in each time period is (w1, w2, ... wn).

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

For example, a combination of transmitted occupant signal power and beam-related parameters is used to limit the transmission of occupant signals. Specifically, the third user equipment sends occupancy signals in n beam directions (θ1, θ2, ... θn), and the maximum power of the occupancy signals sent in each beam direction is (P1, P2, ... Pn).

For example, a combination of time, frequency, and power for sending a placeholder signal is used to limit the sending of the placeholder signal. Specifically, the third user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) , the maximum power of the occupancy signal sent each time in each corresponding time period is (P1, P2, . . . Pn).

For example, a combination of time, frequency and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the third user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) , the beam direction of the occupancy signal sent each time in each corresponding time period is (θ1, θ2, . . . θn).

For example, a combination of time, power, and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the third user equipment sends occupancy signals in n time periods (T1, T2,...Tn, n≥1), and the maximum power of sending occupancy signals in each time period is (P1, P2,...Pn ), the beam directions of the occupancy signals sent each time in corresponding time periods are (θ1, θ2,...θn).

For example, a combination of frequency, power and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the third user equipment sends the occupancy signal M times within the time T, the beam direction of the occupancy signal sent each time is (θ1, θ2, ... θn), and the corresponding maximum power of the occupancy signal sent each time is is (P1,P2,...Pm).

For example, a combination of time, frequency, power and beam parameters for sending the placeholder signal is used to limit the sending of the placeholder signal. Specifically, the third user equipment sends occupancy signals in n time periods (T1, T2, ... Tn, n≥1), and the number of times of sending occupancy signals in each time period is (M1, M2, ... Mn) , the beam direction of the occupancy signal sent each time is (θ1, θ2, ... θn), and the corresponding maximum power of the occupancy signal sent each time is (P1, P2, ... Pm).

It should be understood that the foregoing parameters that limit the sending of the occupancy signal may also be adjusted. For example, when the LBT detection performed by the side chain communication user equipment according to the LBT control information fails, the third user equipment receives the reported information after the LBT detection failure of the side chain communication user equipment, and adjusts the above-mentioned restriction according to the reported information. Each parameter of placeholder signal sending is described. Specifically, because the LBT detection of the side chain communication user equipment fails, at least one of the following adjustments may be made:

(1) Increase the duration of sending the occupancy signal;

(2) Increase the number/frequency of sending occupancy signals;

(3) increasing frequency domain resources used for sending occupancy signals;

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

(5) Increase the number of beams for sending occupancy signals;

(6) Increase the width of the beam used to transmit the occupancy signal.

Further, if side chain communication is to be performed between the third user equipment and the side chain communication user equipment, then the third user equipment may determine whether the side chain communication user equipment has successfully sent the side chain communication service to it. Whether the LBT detection of the side chain communication user equipment is successful, specifically, if the third user equipment successfully receives the side chain communication service of the side chain communication user equipment, it is considered that the LBT detection of the side chain communication user equipment fails.

It should be noted that the above-mentioned one third user equipment sends an occupancy signal for another sidechain communication user equipment, or the above-mentioned one third user equipment sends occupancy signals for multiple sidechain communication user equipments. The embodiments of the present invention are not limited here.

Further, the adjustment of the relevant parameters of the occupancy signal also includes reducing the success rate of channel access by side chain communication users to balance the utilization of unlicensed frequency bands by cellular network users and other communication system users.

Specifically, after a certain number of occupancy signals are sent within a certain period of time, when the occupancy signal is sent next, the occupancy signal is adjusted based on a sixth preset rule; wherein, the sixth preset Rules include at least one of the following:

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

(2) shortening the sum of the duration of sending the occupancy signal multiple times;

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

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

(5) Reduce the beam direction when using the beam to send the occupancy signal.

It should be noted that, in this embodiment, the implementation process of adjusting the occupancy based on the sixth preset rule is the same as the aforementioned implementation process of adjusting the occupancy based on the fourth preset rule. Therefore, it will not be repeated here.

Continuing to refer to FIG. 5, according to another aspect of the present invention, an embodiment of the present invention provides a channel access method for side chain communication based on an unlicensed frequency band, which is used for side chain communication user equipment, and the method includes:

Perceive and select target resources in the unlicensed frequency band for sidechain communication;

Implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) receiving LBT control information from other user equipments, wherein the LBT control information at least includes information indicating an occupancy signal to be listened to when performing LBT detection before starting side chain communication;

(3) implementing LBT detection according to the LBT control information and listening to the occupancy signal;

(4) After the LBT detection succeeds, perform side chain communication on the target resource.

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

The frequency domain resource information for the side chain communication user equipment performing LBT detection according to the LBT control information is, for example: the start frequency domain position F1 and the end frequency domain position F2 for the side chain communication user equipment to perform LBT detection , where F1<F2. The start frequency domain and the end frequency domain take bandwidth (BW), or partial bandwidth (BWP), or sub-channel (Sub-channel), or physical resource block (PRB), or subcarrier (Subcarrier) as a unit. The frequency domain resources for the side chain communication user equipment to implement LBT detection may also be discontinuous, for example, the frequency domain resources for implementing LBT detection are the starting frequency domain position F1 to the ending frequency domain position F1+c, and the starting frequency domain position F1 +d to the end frequency domain position F2, where F1<F1+c<F1+d<F2.

The beam information of the side chain communication user equipment performing side chain communication that performs LBT detection according to the LBT control information is, for example: when the side chain communication uses millimeter wave communication, the LBT control information also includes information about the used beam, such as beam Width, beam direction, etc.

When the side chain communication user equipment performing side chain communication performs LBT detection according to the LBT control information, it judges information related to the idle and busy state of the channel. Specifically, since the third user equipment will send an occupancy signal to prevent users of other communication systems from accessing channels, the side chain communication user equipment 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 will judge that the channel is busy, which will cause LBT detection failure and fail to access the channel. In order to prevent this situation, the third user equipment needs to indicate the power of the occupancy signal and the time-frequency resource used by the occupancy signal to the side chain communication user equipment. The time-frequency resources used by the occupancy signal may be the same as the time-frequency resources that the sidechain communication user equipment needs to listen to when performing LBT, or may be different from the time-frequency resources that need to be listened to when the sidechain 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 detection time period [T1+a, T2-b] (T1<T1+ a<T2-b<T2) within the signal. For example, the occupancy signal is sent in the frequency domain position [F1, F2], but the third user equipment indicates that the side chain communication user equipment only needs to listen to the detection period for [F1+a, F2-b] (F1< Signals within F1+a<F2-b<F2).

It should be understood that for the specific limitations, implementations, and effects of the above steps, refer to the content related to the above-mentioned channel access method for sidechain communication based on unlicensed frequency bands, and details will not be repeated here.

The following will illustrate the technical solution of the present invention through the following examples based on the above-mentioned channel access method for side chain communication based on unlicensed frequency band and the operation flow of the channel access method for side chain communication based on unlicensed frequency band.

example one

As shown in FIG. 7 , the sidechain communication user equipment selects sidechain resources at time t1 and reserves target resources at time t4 . Then the side chain communication user equipment sends the occupancy signal at time t2 to t3. The power of the placeholder signal is P. When the LBT detection threshold of the WiFi user is Pth (Pth<P), the LBT detection of the WiFi user fails. Then the sidechain communication user equipment uses the sidechain communication resource at time t4 to perform sidechain communication.

Example two

As shown in FIG. 8 , the sidechain communication user equipment selects sidechain resources at time t1 and reserves target resources at time t6 . Subsequently, the side chain communication user equipment sends one occupancy signal at time t2 to t3, and sends two occupancy signals at time t4 to t5. The power of the placeholder signal is P. When the LBT detection threshold of the WiFi user is Pth (Pth<P), the LBT detection of the WiFi user fails. Then the sidechain communication user equipment uses the sidechain communication resource at time t6 to perform sidechain communication.

Example three

As shown in FIG. 9 , the sidechain communication user equipment selects sidechain resources at time t1 and reserves target resources at time t6 . Then the side chain communication user equipment sends one occupancy signal at time t2 to t3, and the power of the occupancy signal is P; sends two occupancy signals at time t4 to t5, and the power of the occupancy signal is P1. When the LBT detection threshold of the WiFi user is Pth (Pth<P<P1), the LBT detection of the WiFi user fails. Then the sidechain communication user equipment uses the sidechain communication resource at time t6 to perform sidechain 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 beam directions of θ1 and θ2 respectively. The LBT detection of the WiFi user who received the occupancy signal in the θ beam direction failed. The side chain communication user equipment uses the side chain communication resources to perform side chain communication with another side chain communication user equipment.

Example five

As shown in FIG. 11 , the first side chain communication user equipment performs SCI scheduling at time t1, and sends resources and LBT control information for side chain communication at time t4 to the second side chain communication user equipment. Subsequently, the first side chain communication user equipment sends an occupancy signal at time t2 to t3. The power of the placeholder signal is P. When the LBT detection threshold of the WiFi user is Pth (Pth>P), the WiFi user communicates after the LBT detection succeeds. Therefore, the LBT detection failure of the second side chain communication user equipment is performed and the LBT failure result is fed back. Afterwards, the first user equipment for side chain communication reschedules resources at time t7 so that the first user equipment for side chain communication can perform side chain communication. Subsequently, the downlink occupancy signal is sent at time t5 to t6, and the power of the occupancy signal is P (Pth<P). Afterwards, because the occupancy signal power is greater than the WiFi user LBT detection threshold, the LBT detection of the second side chain communication user equipment succeeds and uses the side chain communication resource at time t7 to perform side chain communication.

According to still another aspect of the present invention, an embodiment of the present invention provides a channel access device for side chain communication based on an unlicensed frequency band.

Fig. 12 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band according to an embodiment of the present invention.

As shown in FIG. 12, the device is used for side chain communication user equipment, specifically, the device 200 includes:

Perception and selection module 210, configured to perceive and select a target resource in an unlicensed frequency band for sidechain communication;

The detection and execution module 220 is used to implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) sending an occupancy signal associated with the target resource before the target start time indicated by the target resource;

(3) Perform side chain communication on the target resource.

In the above-mentioned apparatus 200, the side chain communication user equipment sends the occupancy signal associated with the target resource before the target start time indicated by the target resource to ensure that other user equipment or other communication systems (such as WiFi) are in progress. It will fail during LBT detection, thereby not only improving the LBT detection success rate of the side chain communication user equipment, but also ensuring that the side chain communication user equipment can normally perform side chain communication at the moment of the selected unlicensed frequency band, improving the performance of the side chain communication user equipment. The channel access success rate of the side chain communication user equipment.

It should be understood that for other aspects and effects of the device, reference may be made to the aforementioned content in the channel access method for sidechain communication based on unlicensed frequency bands, which will not be repeated here.

Fig. 13 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

As shown in FIG. 13, the apparatus is used for the first user equipment. Specifically, the apparatus 300 includes:

The receiving module 310 is configured to receive resource scheduling request information from the unlicensed frequency band of the side chain communication user equipment;

The generating and sending module 320 is configured to perceive and select the target resource of the corresponding unlicensed frequency band for the resource scheduling request information to generate resource scheduling information and LBT control information, implement LBT detection, and transmit the The resource scheduling information and the LBT control information are sent to the side chain communication user equipment, wherein the LBT control information at least includes an occupancy for indicating that the side chain communication user equipment is to listen to when performing LBT detection signal information;

The occupancy signal sending module 330 is configured to send an occupancy signal associated with the target resource before the target start time indicated by the target resource.

It should be understood that for other aspects and effects of the device, reference may be made to the aforementioned content in the channel access method for sidechain communication based on unlicensed frequency bands, which will not be repeated here.

Fig. 14 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

As shown in FIG. 14, the device is used for side chain communication user equipment, specifically, the device 400 includes:

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

The receiving module 420 is configured to receive resource scheduling information and LBT control information from other user equipments, wherein the LBT control information includes at least information indicating occupancy signals to be listened to when implementing LBT detection, and the resource scheduling information At least including target resources of an unlicensed frequency band used for the sidechain communication user equipment to perform sidechain communication;

The detection and execution module 430 is configured to implement LBT detection according to the LBT control information and listen to the occupancy signal, and perform the following steps after the LBT detection is successful:

(1) sending resource reservation information, wherein the resource reservation information indicates target resources that need to be reserved;

(2) Perform side chain communication on the target resource.

It should be understood that for other aspects and effects of the device, reference may be made to the aforementioned content in the channel access method for sidechain communication based on unlicensed frequency bands, which will not be repeated here.

Fig. 15 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

As shown in FIG. 15, the apparatus is used for a third user equipment. Specifically, the apparatus 500 includes:

The receiving module 510 is configured to receive resource reservation information of an unlicensed frequency band from a side chain communication user equipment, wherein the resource reservation information indicates target resources that need to be reserved;

The generating and sending module 520 is 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, wherein the LBT control information includes at least Information for indicating the occupancy signal to be listened to by the side chain communication user equipment when implementing LBT detection;

The occupancy signal sending module 530 is configured to send an occupancy signal associated with the target resource before the target start time indicated by the target resource.

It should be understood that for other aspects and effects of the device, reference may be made to the aforementioned content in the channel access method for sidechain communication based on unlicensed frequency bands, which will not be repeated here.

Fig. 16 shows a structural block diagram of a channel access device for side chain communication based on an unlicensed frequency band provided by another embodiment of the present invention.

As shown in FIG. 16, the device is used for side chain communication user equipment, specifically, the device 600 includes:

Perception and selection module 610, configured to perceive and select resources of an unlicensed frequency band for sidechain communication;

The detection and execution module 620 is used to implement LBT detection, and after the LBT detection is successful, perform the following steps:

(1) sending resource reservation information, where the resource reservation information includes the target resources required by the sidechain communication user equipment to perform sidechain communication;

(2) receiving LBT control information from other user equipments, wherein the LBT control information at least includes information indicating an occupancy signal to be listened to when performing LBT detection before starting sidechain communication;

(3) implementing LBT detection according to the LBT control information and listening to the occupancy signal;

(4) After the LBT detection succeeds, perform side chain communication on the target resource.

It should be understood that for other aspects and effects of the device, reference may be made to the aforementioned content in the channel access method for sidechain communication based on unlicensed frequency bands, which will not be repeated here.

In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, it realizes any channel connection of side chain communication based on an unlicensed frequency band as described above. input method.

For the specific definition and implementation of the above steps, please refer to the embodiment of the channel access method for side chain communication based on the unlicensed frequency band, which will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the computer programs can be stored in a non-volatile computer-readable memory In the medium, when the computer program is executed, it may include the processes of the embodiments of the above-mentioned methods. Wherein, any references to memory, storage, database or other media used in the various embodiments provided in the present application may include non-volatile and/or volatile memory. Nonvolatile 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 many forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Chain Synchlink DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

The channel access method, device and storage medium of the side chain communication based on the unlicensed frequency band provided by the embodiment of the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The above The descriptions of the embodiments are only used to help understand the technical solutions and core ideas of the present invention; those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or modify some of the technical features Equivalent replacements are carried out; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (28)

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:

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:

(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) 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:

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.

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;

(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.

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:

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 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;

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.

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;

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

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

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

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,

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.

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;

(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 transmitting the occupancy signal within a certain time;

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

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:

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) 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;

(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.

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:

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:

(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.

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

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 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:

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 a target resource which needs to be reserved;

(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 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 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;

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.

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;

a detection and execution module for performing LBT detection and, after LBT detection is successful, executing 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) 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.

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.

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