Method executed by user equipment and user equipment

Abstract

According to the present disclosure, a method performed by a user equipment and the user equipment are proposed, the method performed by the user equipment being characterized by comprising: performing channel access to one or more channels for one or more expected sidewalk transmissions; and, if a part or all of the one or more channels are not accessed before the start of the one or more expected sideline transmissions, notifying, by the physical layer, a higher layer of the one or more channels that channel access fails and fails to access, the channel access failure occurs before a first candidate start symbol in a time slot unless there are two candidate start symbols in the time slot in which the one or more expected sideline transmissions are located.

Description

Technical Field

[0001] The present disclosure relates to a method performed by a user equipment and the user equipment. Background Art

[0002] In a wireless communication system, information exchange may be performed between different communication nodes. Wireless communication may be performed on licensed spectrum and / or unlicensed spectrum. Examples of wireless communication systems may include systems standardized by 3GPP (3rd Generation Partnership Project), such as a 4G system based on LTE (Long-Term Evolution) radio access technology or its evolved system, or a 5G system based on NR (New Radio) radio access technology or its evolved system. In a communication system based on 3GPP specifications, examples of communication nodes may include a UE (User Equipment) and a base station (such as an eNB, or a gNB). The radio link from the base station to the UE may be referred to as a downlink (DL, downlink), the radio link from the UE to the base station may be referred to as an uplink (UL, uplink), and the radio link between UEs may be referred to as a sidelink (SL, sidelink). The interface for wireless transmission and / or reception between the base station and the UE may be referred to as a Uu interface (such as an NR-Uu interface based on NR; or an LTE-Uu interface based on LTE). The interface for wireless transmission and / or reception between UEs may be referred to as a PC5 interface (such as an NR-PC5 interface based on NR; or an LTE-PC5 interface based on LTE). The UE may perform transmission or reception in one or more BWPs (Bandwidth Parts) in each of one or more carriers, where each carrier may be an uplink carrier, or may be a downlink carrier, or may be a sidelink carrier.

[0003] One or more positioning and / or ranging technologies may be supported in a wireless communication system. When positioning and / or ranging the UE, information such as the position (e.g., absolute position; or relative position) and / or orientation of the UE may be calculated and / or estimated based on measurements of downlink signals, and / or measurements of uplink signals, and / or measurements of sidelink signals.

[0004] To support various services in a wireless communication system, such as including some or all of communication, positioning, and ranging, a series of problems need to be solved. For example, operations on licensed spectrum and unlicensed spectrum; for another example, operations on paired spectrum and unpaired spectrum; for another example, shared spectrum channel access; for another example, initial access; for another example, multiple access; for another example, random access; for another example, channel coding; for another example, generation, transmission, and reception of physical layer channels and signals (such as including determination of some or all of transmission bandwidth, transmission waveform, modulation scheme, subcarrier spacing, and cyclic prefix); for another example, transmission and reception based on some or all of unicast, multicast, broadcast, and groupcast; for another example, physical layer control information and signaling procedures (such as including synchronization procedures, scheduling mechanisms, and feedback mechanisms, etc.); for another example, frame structure; for another example, timing adjustment; for another example, timing relationship; for another example, transmission power control; for another example, signal measurement; for another example, higher layer control information and signaling procedures; for another example, allocation and management of resources; for another example, multi-carrier operation, such as including carrier aggregation and dual connectivity; for another example, multi-antenna transmission and reception; for another example, beam-based operations; for another example, priority-based operations; for another example, multi-point cooperation; for another example, relaying operations; for another example, mobility management; for another example, in-device coexistence; for another example, inter-system interoperability and coexistence. Summary of the Invention

[0005] To solve at least some of the above problems, the present disclosure provides a method performed by a user equipment and the user equipment. In an operation with shared spectrum channel access, for a situation where there are two candidate starting symbols in a time slot, only a LBT failure notification is triggered for a channel access failure (if any) that occurs before the second candidate starting symbol, and not for a channel access failure (if any) that occurs before the first candidate starting symbol, which improves the accuracy of continuous LBT failure detection and avoids unnecessary continuous LBT failures.

[0006] According to the present disclosure, a method executed by a user equipment is provided, which is characterized by including: performing channel access on one or more channels for one or more expected sidelink transmissions; and if part or all of the one or more channels cannot be accessed before the start of the one or more expected sidelink transmissions, notifying a higher layer of the channel access failure and the one or more channels that cannot be accessed by a physical layer, unless there are two candidate start symbols in a time slot where the one or more expected sidelink transmissions are located, and the channel access failure occurs before the first candidate start symbol in the time slot.

[0007] In addition, according to the present disclosure, a user equipment is provided, including: a processor; and a memory storing instructions, wherein the instructions execute the above method when run by the processor.

[0008] Therefore, the present disclosure provides a method, wherein in an operation of shared spectrum channel access, for a case where there are two candidate start symbols in a time slot, only a LBT failure notification is triggered for a channel access failure (if any) that occurs before the second candidate start symbol, and a LBT failure notification is not triggered for a channel access failure (if any) that occurs before the first candidate start symbol, improving the accuracy of continuous LBT failure detection and avoiding unnecessary continuous LBT failures. Description of the Drawings

[0009] Through the following detailed description in conjunction with the drawings, the above and other features of the present disclosure will become more obvious, wherein:

[0010] Figure 1 A flowchart corresponding to a method executed by a UE according to Embodiment 1 of the present disclosure is shown.

[0011] Figure 2 A flowchart corresponding to a method executed by a UE according to Embodiment 2 of the present disclosure is shown.

[0012] Figure 3 A block diagram of a UE involved in the present disclosure is shown. Detailed Embodiments

[0013] The present disclosure will be elaborated in detail below in conjunction with the drawings and specific embodiments. It should be noted that the present disclosure should not be limited to the specific embodiments described below. Additionally, for the sake of simplicity, the detailed description of well-known technologies that have no direct association with the present disclosure is omitted to prevent confusion in the understanding of the present disclosure.

[0014] The following uses the 5G wireless communication system specifications developed by 3GPP and its subsequent evolved versions (e.g., 5G Advanced) as an example application environment, and specifically describes multiple embodiments according to the present disclosure. However, it should be noted that the present disclosure is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as wireless communication systems after 5G, or 4G mobile communication systems before 5G such as LTE, LTE-Advanced, LTE-Advanced Pro, etc.

[0015] The terms given in the present disclosure may adopt different naming methods in different wireless communication systems, but the present disclosure uses unified terms, and when applied to a specific system, they can be replaced with the terms adopted in the corresponding system.

[0016] In all embodiments and implementations of the present disclosure, unless otherwise specified:

[0017] · "Node" and "communication node" can be interchanged.

[0018] · "Base station" may refer to a base station of a 4G or its evolved system, or may refer to a base station of a 5G or its evolved system, or may refer to a base station in another communication system.

[0019] · "Number" and "index" can be interchanged. For example, the number of an RB (resource block) can also be referred to as the index of the RB; for another example, "number an RB as 0" can also be expressed as "index an RB as 0".

[0020] · The elements in a set (or array, or list, or sequence, etc.) can correspond to indexes 0, 1, 2,... in the order of their appearance, or can correspond to indexes 1, 2, 3,... in turn. For example, the elements t0, t1,..., t N-1} in the set can correspond to indexes 0, 1,..., and N - 1 respectively. N-1

[0021] · The elements in a set (or array, or list, or sequence, etc.) can be represented by their indexes. For example, an RE (Resource Element) with an index of 0 can be called "RE 0".

[0022] · The index corresponding to an object (such as a subcarrier, a time slot, a cyclic shift, etc.) (for example, the index of the object in a set, or an array, or a list, or a sequence) can be used as the "identifier" (ID) of the object.​

[0023] · The index corresponding to an object can be used to indicate the object in signaling.

[0024] · If the quantity corresponding to an object is not specified when referring to the object, the quantity of the object can be one, or can be multiple. For example, in "performing a transmission on a channel", the "transmission(s)" can correspond to one transmission, or multiple transmissions.

[0025] · A time series (e.g., denoted as t0, t1,..., t N-1 ) or each element in a corresponding set (e.g., denoted as {t0, t1,..., t N-1}) can appear in chronological order. For example, the time corresponding to t0 is earlier than (or, not later than) the time corresponding to t1, the time corresponding to t1 is earlier than (or, not later than) the time corresponding to t2, and so on.

[0026] · Δ(x1, x2) can represent the offset between x1 and x2 (offset between x1 and x2; or, "the offset of x2 with respect to x1", offset of x2 with respect to x1; or, "the offset from x1 to x2", offset from x1 to x2), where x1 and x2 can be the values of two comparable parameters (or variables) respectively, or can be two possible values of a parameter (or variable). For example, if x1 and x2 are two time slots in a resource pool, Δ(x1, x2) can be defined as the difference between the time slot index corresponding to time slot x2 and the time slot index corresponding to time slot x1, where the time slot index can be a physical time slot index, or a logical time slot index (e.g., the index of the corresponding time slot in the set of time slots of the resource pool).

[0027] · In a bit string of size (or referred to as "length") L bits (e.g., denoted as 'b0b1…b L-1 '), the leftmost bit (i.e., b0) can correspond to the most significant bit, and correspondingly, the rightmost bit (i.e., b L-1 ) can correspond to the least significant bit.

[0028] · In a bit string of size (or referred to as "length") L bits (e.g., denoted as 'b0b1…b L-1 '), the leftmost bit (i.e., b0) can correspond to the least significant bit, and correspondingly, the rightmost bit (i.e., b L -1) can correspond to the most significant bit.

[0029] · A priority can correspond to a priority value. For example, the priority value corresponding to one priority is 1, and the priority value corresponding to another priority is 8.

[0030] · The relationship between a priority and its corresponding priority value can be: as the priority value increases, the priority decreases. For example, if the priority values associated with a first sidelink transmission and a second sidelink transmission are 1 and 2 respectively, then the priority of the first sidelink transmission is higher than that of the second sidelink transmission.

[0031] · The relationship between a priority and its corresponding priority value can be: as the priority value increases, the priority increases. For example, if the priority values associated with a first sidelink transmission and a second sidelink transmission are 1 and 2 respectively, then the priority of the first sidelink transmission is lower than that of the second sidelink transmission.

[0032] · Δf can represent the subcarrier spacing (SCS) of a carrier or a bandwidth segment. For example, Δf = 15 kHz; another example, Δf = 30 kHz; another example, Δf = 60 kHz; another example, Δf = 120 kHz.

[0033] · μ can represent the SCS configuration corresponding to an SCS. For example, μ = 0 can correspond to Δf = 15 kHz; another example, μ = 1 can correspond to Δf = 30 kHz; another example, μ = 2 can correspond to Δf = 60 kHz; another example, μ = 3 can correspond to Δf = 120 kHz.

[0034] · Constant T c can be defined as: T c = 1 / (Δf max · N f ), where Δf max = 480 · 10 3 Hz, N f = 4096.

[0035] · Constant κ can be defined as: κ = T s / T c = 64, where T s = 1 / (Δf ref · N f，ref ), Δf ref = 15 · 10 3 Hz, N f，ref = 2048.

[0036] In some aspects, a "node" may refer to a network node (e.g., a base station).

[0037] In some aspects, a "node" may refer to a non-network node (e.g., a UE).

[0038] In some aspects, "Layer 1" and the "physical layer" may be interchangeable.

[0039] In some aspects, "Layer 2" may not contain any sub-layers.

[0040] In some aspects, "Layer 2" may contain one or more sub-layers, such as part or all of MAC (Medium Access Control), RLC (Radio Link Control Protocol), PDCP (Packet Data Convergence Protocol), and SDAP (Service Data Adaptation Protocol).

[0041] In some aspects, "higher layer(s)" (or "upper layer(s)") may refer to one or more protocol layers or protocol sub-layers above a reference protocol layer or reference protocol sub-layer in a specific protocol stack (e.g., an access stratum protocol stack). For example, if the reference protocol layer or reference protocol sub-layer is the physical layer, "higher layer(s)" may at least partially include part or all of the MAC layer, RLC layer, PDCP layer, SDAP layer, RRC (Radio Resource Control) layer, PC5-RRC layer, and PC5-S layer. Unless otherwise specified, the reference protocol layer or reference protocol sub-layer may be the physical layer. When there is no risk of confusion, "higher layer(s)" may also be referred to as "upper layer(s)".

[0042] In some aspects, a "lower layer(s)" may refer to one or more protocol layers or protocol sub - layers below a reference protocol layer or reference protocol sub - layer in a specific protocol stack. For example, if the reference protocol layer or reference protocol sub - layer is the RRC layer, the "lower layer" may include part or all of the MAC layer and the physical layer; again, if the reference protocol layer or reference protocol sub - layer is the MAC layer, the "lower layer" may refer to the physical layer. Unless otherwise specified, the reference protocol layer or reference protocol sub - layer may be the MAC layer. When there is no risk of confusion, the "lower layer" may also be referred to as the "low layer".

[0043] In some aspects, "signaling" may refer to signaling at the physical layer, such as DCI (Downlink Control Information), UCI (Uplink Control Information), or SCI (Sidelink Control Information).

[0044] In some aspects, "signaling" may refer to signaling at a higher layer, such as MAC CE (Control Element).

[0045] In some aspects, a "parameter" may refer to a parameter at the physical layer.

[0046] In some aspects, a "parameter" may refer to a parameter at a higher layer.

[0047] In some aspects, a "parameter" may refer to a predefined parameter. For example, the number of sub - carriers in each RB may be a predefined constant, such as

[0048] In some aspects, a "parameter" may refer to a "configured" parameter. For example, the configuration information corresponding to a "configured" parameter (e.g., the value of the parameter) may be provided by a protocol layer (such as the RRC layer) in one communication node to another protocol layer (such as the physical layer); again, the configuration information corresponding to a "configured" parameter (e.g., the value of the parameter) may be provided by a protocol layer (such as the RRC layer) in one communication node to the peer protocol layer in another communication node; again, the configuration information corresponding to a "configured" parameter (e.g., the value of the parameter) may be pre - set in a specific storage location in a communication node or other storage locations accessible to the node. In this case, the parameter may also be referred to as a "pre - configured" parameter.

[0049] In some aspects, a "symbol" may refer to an OFDM (Orthogonal Frequency Division Multiplexing) symbol.

[0050] In some aspects, a resource may be at least partially identified by one or more parameters in the time-domain. For example, the one or more parameters may include some or all of the following: the starting symbol of the resource, the starting time slot of the resource, the number of symbols occupied by the resource, and the number of time slots occupied by the resource.

[0051] In some aspects, a resource may be at least partially identified by one or more parameters in the frequency-domain. For example, the one or more parameters may include some or all of the following: the starting sub-channel of the resource, the starting RB of the resource, the starting sub-carrier of the resource, the number of sub-channels occupied by the resource, the number of RBs occupied by the resource, and the number of sub-carriers occupied by the resource.

[0052] In some aspects, a resource may be at least partially identified by one or more parameters in the code-domain. For example, the one or more parameters may include some or all of the following: the cyclic shift value or the corresponding cyclic shift index corresponding to the resource, and the cyclic shift pair value or the corresponding cyclic shift pair index corresponding to the resource.

[0053] In some aspects, a resource may be at least partially identified by one or more parameters in the spatial-domain. For example, the one or more parameters may include the layer corresponding to the resource, where a "layer" may refer to one of the one or more layers to which a TB (Transport Block) or its corresponding codeword is mapped in spatial multiplexing.

[0054] In some aspects, "RB" may refer to a PRB (physical resource block), and correspondingly, "RB index" may refer to a PRB index.

[0055] In some aspects, "RB" may refer to a VRB (virtual resource block), and correspondingly, "RB index" may refer to a VRB index.

[0056] In some aspects, "RB" may refer to a CRB (common resource block), and correspondingly, "RB index" may refer to a CRB index.

[0057] In some aspects, "RB" may refer to an IRB (Interlaced Resource Block), and correspondingly, "RB index" may refer to an IRB index.

[0058] In some aspects, in the time domain, a "frame" (or "radio frame") may refer to a system frame, and the corresponding frame number may be referred to as a system frame number (SFN).

[0059] In some aspects, in the time domain, a "frame" (or "radio frame") may refer to a direct frame, and the corresponding frame number may be referred to as a direct frame number (DFN).

[0060] In some aspects, a frame number cycle (or frame cycle) may contain T FNP = 1024 frames, indexed as 0, 1,..., 1023 in chronological order. The duration of each frame may be T f = 10 milliseconds, which may contain 10 subframes, and the duration of each subframe is T sf = 1 millisecond. Each subframe may contain time slots. For example, the index of a time slot in a subframe may be denoted as the index of a time slot in a frame may be denoted as where may be equal to 10·2 μ . The index of a time slot in a frame cycle may be denoted as where may be equal to (e.g., 1024·(10·2 μ ))).

[0061] In some aspects, a "physical time slot" may refer to a time slot belonging to a set of physical time slots, where the set of physical time slots may be all the time slots in a continuous period of time (e.g., a frame number cycle); the physical time slots in the set of physical time slots may be indexed as 0, 1,... in chronological order.

[0062] In some aspects, "transmission" may refer to uplink transmission, or may refer to downlink transmission, or may refer to sidelink transmission.

[0063] In some aspects, "carrier" may refer to uplink carrier, or may refer to downlink carrier, or may refer to sidelink carrier.

[0064] In some aspects, "bandwidth segment" may refer to uplink bandwidth segment, or may refer to downlink bandwidth segment, or may refer to sidelink bandwidth segment.

[0065] In some aspects, "operation" may refer to uplink operation, or may refer to downlink operation, or may refer to sidelink operation.

[0066] In some aspects, a "transmission" may correspond to the transmission of a physical channel. For example, the physical channel may be a PDCCH (Physical Downlink Control Channel), or may be a PDSCH (Physical Downlink Shared Channel), or may be a PRACH (Physical Random-Access Channel), or may be a PBCH (Physical Broadcast Channel), or may be a PUCCH (Physical Uplink Control Channel), or may be a PUSCH (Physical Uplink Shared Channel), or may be a PSCCH (Physical Sidelink Control Channel), or may be a PSSCH (Physical Sidelink Shared Channel), or may be a PSFCH (Physical Sidelink Feedback Channel), or may be a PSBCH (Physical Sidelink Broadcast Channel), or may be some other physical channel.

[0067] In some aspects, a "transmission" may correspond to the transmission of a physical signal. For example, the physical signal may be a PSS (Primary Synchronization Signal), or may be an SSS (Secondary Synchronization Signal), or may be a CSI-RS (Channel-State Information Reference Signal, CSI reference signal), or may be a DM-RS (Demodulation Reference Signal), or may be a PT-RS (Phase-tracking reference signals), or may be an SRS (Sounding Reference Signal), or may be a RIM-RS (RemoteInterference Management Reference Signal), or may be an S-PSS (Sidelink primary synchronization signal), or may be an S-SSS (Sidelink secondary synchronization signal), or may be an SL PRS (Sidelink Positioning Reference Signal), or may be some other physical signal.

[0068] In some aspects, a "transmission" may correspond to the transmission of zero or one or more physical channels and zero or one or more physical signals multiplexed in the same resource (e.g., a time-frequency in a resource pool; or several RBs in a time slot). For example, an "SS / PBCH block" (or an "SSB" for short) may consist of a PSS, an SSS, and a PBCH multiplexed in the same time slot; or an "S-SS / PSBCH block" (or an "S-SSB" for short) may consist of an S-PSS, an S-SSS, and a PSBCH multiplexed in the same time slot; or a "PSCCH / PSSCH" (or a "PSSCH / PSCCH" for short) may consist of a PSCCH and its associated PSSCH multiplexed in the same time slot.

[0069] In some aspects, a DCI carried in a downlink transmission (e.g., PDCCH) and corresponding to a specific DCI format (e.g., denoted as DCI format X) may be referred to as "a DCI format X". For example, a DCI carried in a PDCCH and corresponding to DCI format 0_0 may be referred to as "a DCI format 0_0".

[0070] In some aspects, when there is no risk of confusion, the name of a physical channel (or physical signal) for transmission may be used to represent the transmission of the physical channel (or physical signal). For example, "PSFCH" may represent "PSFCH transmission".

[0071] In some aspects, when there is no risk of confusion, the name of a physical channel (or physical signal) for reception may be used to represent the reception of the physical channel (or physical signal). For example, "PSFCH" may represent "PSFCH reception".

[0072] In some aspects, "sidelink" may refer to NR sidelink. For example, a physical sidelink channel or signal (e.g., PSSCH) may refer to a physical sidelink channel or signal in NR (e.g., NR PSSCH).

[0073] In some aspects, "sidelink" may refer to LTE sidelink. For example, a physical sidelink channel or signal (e.g., PSSCH) may refer to a physical sidelink channel or signal in LTE (e.g., LTE PSSCH).

[0074] In some aspects, "sidelink operation" may at least partially include some or all of sidelink reception, sidelink transmission, and sidelink measurement.

[0075] In some aspects, "sidelink operation" may at least partially be used for some or all of sidelink functions including sidelink communication, sidelink discovery, and sidelink positioning. For example, "sidelink reception" may include reception for sidelink communication; for another example, "sidelink transmission" may include transmission for sidelink discovery; for yet another example, "sidelink measurement" may include measurement for sidelink positioning.

[0076] In some aspects, "resource pool" may refer to a sidelink resource pool.

[0077] In some aspects, a "sidelink grant" may refer to a "sidelink dynamic grant", or a "sidelink configured grant", or another form of sidelink grant.

[0078] In some aspects, a "sidelink configured grant" may refer to a "type 1 sidelink configured grant", or a "type 2 sidelink configured grant", or other forms of sidelink configured grants.

[0079] In some aspects, the "release" operation of a sidelink configured grant may also be referred to as the "deactivation" operation of the sidelink configured grant.

[0080] In some aspects, "sidelink dynamic grant" and "dynamic sidelink grant" can be interchanged.

[0081] In some aspects, "sidelink configured grant" and "configured sidelink grant" can be interchanged.

[0082] In some aspects, "type 1 sidelink configured grant" and "sidelink configured grant type 1" can be interchanged.

[0083] In some aspects, "type 2 sidelink configured grant" and "sidelink configured grant type 2" can be interchanged.

[0084] In some aspects, a "sidelink identity (sidelink ID)" may refer to a layer 1 sidelink identity.

[0085] In some aspects, a "sidelink identity" may refer to a layer 2 sidelink identity.

[0086] In some aspects, a "sidelink identity" can be used as a "destination ID". For example, a destination ID indicated in a multicast transmission can be used to identify a group corresponding to the multicast transmission; also, a destination ID indicated in a broadcast transmission can be used to identify a service corresponding to the broadcast transmission; also, a destination ID indicated in a unicast transmission can be used to identify the intended receiving UE of the unicast transmission (for example, the destination ID can be a source ID of the intended receiving UE).

[0087] In some aspects, a "sidelink identifier" can be used as a "source ID". For example, a source identifier indicated in a unicast (or multicast, or broadcast) transmission can be used to identify the UE performing the transmission.

[0088] In some aspects, a "priority" can refer to a "sidelink priority".

[0089] In some aspects, a "sidelink resource" can refer to a resource that can be used for a sidelink transmission. For example, a sidelink resource can be a time-frequency resource corresponding to one or more consecutive symbols in a slot in the time domain and one or more subchannels in the frequency domain.

[0090] In some aspects, a "logical slot" can refer to a slot belonging to a certain resource pool.

[0091] In some aspects, a "logical slot" can refer to a slot that can be configured to belong to a certain resource pool.

[0092] In some aspects, a "sidelink slot" can refer to a slot belonging to a certain resource pool.

[0093] In some aspects, a "sidelink slot" can refer to a slot that can be configured to belong to a resource pool.

[0094] In some aspects, a "sidelink symbol" can refer to a symbol configured for sidelink.

[0095] In some aspects, a "sidelink slot" can refer to a slot containing sidelink symbol(s).

[0096] In some aspects, a "sidelink slot" can refer to a slot that can be used for sidelink transmission (or, sidelink reception). For example, a sidelink slot can be a slot that can be used for part or all of PSSCH, PSCCH, and PSFCH; or a sidelink slot can be a slot that can be used for part or all of PSSCH, PSCCH, PSFCH, and S-SSB.

[0097] In some aspects, an SCI carried in a sidelink transmission (e.g., PSCCH; or PSSCH; or PSCCH / PSSCH) corresponding to a specific SCI format (e.g., denoted as SCI format X) can be referred to as "an SCI format X". For example, an SCI carried in a PSCCH corresponding to SCI format 1-A can be referred to as "an SCI format 1-A"; or an SCI carried in a PSSCH corresponding to SCI format 2-A can be referred to as "an SCI format 2-A".

[0098] In some aspects, "SCI" may refer to "single-stage SCI".

[0099] In some aspects, "SCI" may refer to part or all of "two-stage SCI". For example, "SCI" may refer to a first-stage SCI (1 st -stage SCI) format, or a second-stage SCI (2 nd -stage SCI) format, or a first-stage SCI format and its associated second-stage SCI format.

[0100] In all embodiments and implementations of the present disclosure, unless otherwise specified, "transmission" may refer to sidelink transmission, "carrier" may refer to sidelink carrier, "bandwidth segment" may refer to sidelink bandwidth segment, "resource pool" may refer to sidelink resource pool, and "operation" may refer to sidelink operation.

[0101] A communication node may operate in licensed spectrum (e.g., band n78, corresponding to the frequency range of 3300 MHz to 3800 MHz) and / or unlicensed spectrum (e.g., band n46, corresponding to the frequency range of 5150 MHz to 5925 MHz).

[0102] A communication node may support "operation with shared-spectrum channel access", for example, including corresponding physical layer procedure(s). In the operation with shared-spectrum channel access, a "channel" may correspond to a carrier (e.g., denoted as c0), or a part of the carrier c0. For example, if the bandwidth of the carrier c0 is 20 MHz, correspondingly, a channel may correspond to the carrier c0; or if the bandwidth of the carrier c0 is 40 MHz, correspondingly, a channel may correspond to the lower 20 MHz of the carrier c0, and another channel may correspond to the remaining (i.e., the higher-frequency) 20 MHz of the carrier c0. A channel may contain one RB or multiple contiguous RBs.

[0103] More generally, the carrier c0 may contain channels (e.g., contiguous channels), for example, denoted as and in ascending order of frequency, respectively. The corresponding set of channels may be denoted as where may be an integer greater than or equal to 1. On the other hand, the carrier c0 may contain an "RB set", for example consecutive RB sets), for example, are respectively denoted in ascending order of frequency as and The corresponding set of RB sets can be denoted as where each RB set can consist of one RB or multiple consecutive RBs; can be an integer greater than or equal to 1; for RB set the lowest-indexed CRB, the highest-indexed CRB, and the number of RBs can be respectively denoted as where can be equal to

[0104] There can be a guard band (for example, called "intra-cell guardband") between two adjacent RB sets (for example, the and the ), where each intra-cell guardband can consist of one RB or multiple consecutive RBs, and each such RB can be called a "guardband RB". For example, there can be in the carrier c0 for separating the RB sets, for example, are respectively denoted as and The corresponding set of intra-cell guardbands can be denoted as where, for can be used to separate RB set and RB set The lowest-indexed CRB, the highest-indexed CRB, and the number of RBs can be respectively denoted as where can be equal to Specifically, for example, the bandwidth of the carrier c0 is 40 MHz. Correspondingly, for 15 kHz SCS, the carrier c0 can contain 216 consecutive RBs (for example, their CRB indices are respectively denoted as 0, 1,..., and 215), and the 216 RBs can be divided into three parts: a first RB set (where ), an intra-cell guardband (where ), and a second RB set (where ).

[0105] For If is an empty set, it can be considered that there is no intra-cell guard band in the corresponding cell, and vice versa. If for i = 0, 1, ……, and are all empty sets, it can be considered that there is no intra-cell guard band between any two adjacent RB sets of the carrier c0.

[0106] In some aspects, each RB set can uniquely correspond to a channel, and vice versa. For example, the can be equal to the and for RB set can correspond to the channel The RB(s) contained. In some aspects, "RB set" and "channel" can be interchanged.

[0107] In the operation of band-sharing spectrum channel access, channel access can at least partially include one or more of the following:

[0108] · Channel access performed on one channel. For example, this can correspond to a "channel access procedure" performed in order to perform transmission(s) on the channel.

[0109] · Channel access performed on multiple channels. For example, this can correspond to multiple channel access procedures (e.g., performing a channel access procedure on each of the multiple channels respectively) performed in order to perform transmission(s) on the multiple channels, where the multiple channel access procedures can be collectively referred to as a "multi-channel access procedure".

[0110] In all embodiments and implementations of the present disclosure, unless otherwise specified, "channel" can refer to the channel in the operation of band-sharing spectrum channel access, "channel access procedure" can refer to the sidelink channel access procedure, "multi-channel access procedure" can refer to the sidelink multi-channel access procedure, the transmission(s) for which channel access is performed can be "sidelink transmission", and "time slot" can refer to the sidelink time slot.

[0111] In some aspects, in the channel access performed on multiple channels, all corresponding transmission(s) are in the same bandwidth segment.

[0112] In some aspects, in channel access performed on multiple channels, all corresponding transmission(s) are in the same resource pool.

[0113] In some aspects, the start time of a transmission may refer to the start time after applying CP (cyclic prefix) extension (if any).

[0114] In some aspects, the start time of a transmission may refer to the start time before applying CP extension (if any).

[0115] In some aspects, the transmission(s) for which channel access is performed may be referred to as "intended transmission(s)".

[0116] In some aspects, in channel access performed on multiple channels, all intended transmission(s) start at the same time (e.g., the same symbol in the same time slot) on all corresponding channel(s).

[0117] The result of a channel access procedure may be "success" (or referred to as "channel access success"), for example, this may indicate successful access to the corresponding channel. In some aspects, this may apply to channel access performed on a single channel. In some aspects, this may apply to each channel access procedure in channel access performed on multiple channels. In some aspects, if the result of the channel access procedure is "success", the channel may be used for the corresponding intended transmission(s).

[0118] In some aspects, if a transmission is performed, it means that the result of the channel access performed for the transmission (if applicable) is "success".

[0119] The result of a channel access procedure may be "failure" (or referred to as "channel access failure"), for example, this may indicate failure to access the corresponding channel. In some aspects, this may apply to channel access performed on a single channel. In some aspects, this may apply to each channel access procedure in channel access performed on multiple channels. In some aspects, if the result of the channel access procedure is "failure", the channel may not be used for the corresponding intended transmission(s).

[0120] In some aspects, "channel access failure" may indicate that the corresponding channel(s) is / are being occupied.

[0121] In some aspects, a reason for a transmission not being performed can be channel access failure (if applicable), or can be prioritization (if applicable), or can be other reasons.

[0122] In some aspects, "prior to a transmission" (or "before the start of a transmission") can be used to indicate before the start time of the said transmission.

[0123] In some aspects, if a UE fails to access the corresponding channel(s) prior to the expected transmission(s), the physical layer of the UE can notify the higher layer of the UE of the channel access failure, where the notification can be referred to as "LBT failure notification", or "LBT failure report", or "LBT failure indication". A LBT failure notification can indicate that a channel access failure has occurred and the corresponding channel(s) (or corresponding RB Set(s)) that could not be accessed.

[0124] In some aspects, a LBT failure notification can be triggered for each sidelink bandwidth segment, and correspondingly, the channel(s) (or corresponding RB Set(s)) that could not be accessed indicated by a LBT failure notification are the channels (or corresponding RB Sets) in the corresponding sidelink bandwidth segment.

[0125] In some aspects, if a UE fails to access part or all of the corresponding channel(s) prior to the expected transmission(s), the physical layer of the UE can trigger a LBT failure notification.

[0126] In some aspects, the number of LBT failure notifications triggered by the physical layer of a UE within a given period of time (e.g., within a time slot) does not exceed where the can correspond to a predefined or configured parameter; the can be an integer greater than or equal to 1 (e.g., for another example, )。For example, this can apply to channel access performed for some or all of the PSCCH transmission(s), PSCCH / PSSCH transmission(s), PSSCH transmission(s), PSFCH transmission(s), S-SSB transmission(s).

[0127] In some aspects, for a bandwidth segment, the number of LBT failure notifications triggered by a UE's physical layer in a time slot does not exceed the For example, this can apply to channel access performed for some or all of the PSCCH transmission(s), PSCCH / PSSCH transmission(s), PSSCH transmission(s), PSFCH transmission(s), S-SSB transmission(s).

[0128] In some aspects, for a resource pool in a bandwidth segment, the number of LBT failure notifications triggered by a UE's physical layer in a time slot does not exceed the For example, this can apply to channel access performed for some or all of the PSCCH transmission(s), PSCCH / PSSCH transmission(s), PS SCH transmission(s), PSFCH transmission(s), S-SSB transmission(s).

[0129] In some aspects, for a set of RBs in a bandwidth segment, under certain conditions, a UE's higher layer can trigger (or "indicate") a "persistent LBT failure" for the set of RBs based on LBT failure notification(s) received from the UE's physical layer.

[0130] In some aspects, for a set of RBs in a bandwidth segment, under certain conditions, a UE's higher layer can cancel the "persistent LBT failure" triggered for the set of RBs.

[0131] In all embodiments and implementations of the present disclosure, unless otherwise specified, "LBT failure" may refer to sidelink LBT failure, and "persistent LBT failure" may refer to sidelink persistent LBT failure.

[0132] In some aspects, the operation of evaluating whether one or more channels can be used to perform an intended transmission(s) may be referred to as CCA (Clear Channel Assessment). This mechanism of performing CCA before using one or more channels may be referred to as LBT (Listen Before Talk). Accordingly, each channel may be referred to as an "LBT channel", "successful channel access" may be referred to as "LBT success", and "failed channel access" may be referred to as "LBT failure". Whether a communication node needs to perform CCA (or referred to as "whether to perform LBT") and the specific process of CCA may be related to the regulations of the country and / or region where the node is located.

[0133] In some aspects, a channel access process may be referred to as an "LBT process", and vice versa.

[0134] After performing a channel access process, the transmission(s) performed on the corresponding channel(s) may be referred to as "Channel Occupancy" (CO), and the corresponding duration may be referred to as "Channel Occupancy Time" (COT). In some aspects, when there is no risk of confusion, "CO" and "COT" may be interchangeable.

[0135] In some aspects, a COT may be shared among one or more communication nodes. In some aspects, the time corresponding to a COT may include the duration of the transmission(s) performed on the corresponding channel(s); in some aspects, the time corresponding to a COT may include the time corresponding to the transmission gap between any two adjacent transmissions in the corresponding transmission(s) (for example, when the duration of the transmission gap is less than or equal to 25 us). In some aspects, a COT shall not exceed a predefined or configured maximum value (for example, referred to as the maximum COT, or simply MCOT).

[0136] In some aspects, a type 1 channel access process may correspond to a case where it is a random value, a "type 2 channel access process" may correspond to a case where it is a determined value, where the is the time spanned by sensing slots that are sensed as idle before the corresponding expected transmission(s).

[0137] In some aspects, a type 1 channel access procedure can be used to “initiate” a COT.

[0138] In some aspects, a type 2 channel access procedure can be used to perform channel access in a COT shared by other communication nodes.

[0139] In some aspects, a type 1 channel access procedure and a type 2 channel access procedure can be used respectively to perform channel access for the transmission of different physical channels (or signals).

[0140] In some aspects, in channel access performed on multiple channels, the types of the corresponding multiple channel access procedures can be completely the same, or partially the same, or completely different. For example, each of the multiple channel access procedures can be a type 1 channel access procedure; or, among the multiple channel access procedures, one is a type 1 channel access procedure.

[0141] A communication node can support “operation without shared spectrum channel access”. For example, in operation without shared spectrum channel access, no “channel access procedure” may be performed.

[0142] In some aspects, “operation with shared spectrum channel access” can refer to operation on unlicensed spectrum.

[0143] In some aspects, “operation with shared spectrum channel access” can apply to (or, apply to and only apply to) unlicensed spectrum.

[0144] In some aspects, operation on unlicensed spectrum can always be “operation with shared spectrum channel access”.

[0145] In some aspects, “operation with shared spectrum channel access” and “operation on unlicensed spectrum” can be interchanged.

[0146] In some aspects, “operation without shared spectrum channel access” can refer to operation on licensed spectrum.

[0147] In some aspects, “operation without shared spectrum channel access” can apply to (or, apply to and only apply to) licensed spectrum.

[0148] In some aspects, operations on licensed spectrum can always be "operations without shared spectrum channel access".

[0149] In some aspects, "operations without shared spectrum channel access" and "operations on licensed spectrum" can be interchangeable.

[0150] For "operations with shared spectrum channel access", a channel can be referred to as a "shared spectrum channel", and vice versa.

[0151] For "operations without shared spectrum channel access", a channel can be referred to as a "shared spectrum channel", and vice versa.

[0152] In sidelink-based operations, in a bandwidth part configured (e.g., by a higher layer) for a UE, one or more resource pools that can be used for PSSCH transmission can be configured. A resource pool can be associated with sidelink resource allocation mode 1, or can be associated with sidelink resource allocation mode 2.

[0153] There can be consecutive sidelink symbols in a time slot, for example, the corresponding symbol indices are sequentially recorded in chronological order as and wherein, the symbol can be referred to as the "starting sidelink symbol" in the time slot, and can respectively correspond to the higher layer parameters sl-StartSymbol and sl-LengthSymbols. For example, the value of can be an element in the set {0, 1,..., 7}, the value of can be an element in the set {7, 8,..., 14}.

[0154] A PSSCH and its associated PSCCH can be transmitted in the same time slot, wherein the PSSCH can occupy one or more consecutive sidelink symbols in the time slot.

[0155] In some aspects, in a time slot, a PSSCH transmission can have a corresponding "PSSCH starting symbol" (e.g., denoted as ), correspondingly, the PSSCH resource allocation corresponding to the PSSCH transmission can start from the symbol The symbol It can be a symbol that can be used for AGC (Automatic Gain Control).

[0156] In some aspects, a "first candidate PSSCH starting symbol" (e.g., denoted as whose corresponding higher layer parameter can be startingSymbolFirst, or can be sl-StartingSymbolFirst) and a "second candidate PSSCH starting symbol" (e.g., denoted as whose corresponding higher layer parameter can be startingSymbolSecond, or can be sl-StartingSymbolSecond) can be configured (or referred to as "provided") for a bandwidth segment.

[0157] In some aspects, in a bandwidth segment configured with the said symbol and the said symbol (e.g., in a resource pool within the said bandwidth segment), the number of "candidate PSSCH starting symbols" (i.e., symbols that can be used as "PSSCH starting symbols") in a time slot can be an integer greater than or equal to 1 (e.g., 1; or, 2). For example, if there is no PSFCH symbol in the said time slot, there can be two "candidate PSSCH starting symbols" in the said time slot, namely the said symbol and the said symbol Accordingly, the "PSSCH starting symbol" for a PSSCH transmission in the said time slot can be the said symbol or can be the said symbol Or, if there is a PSFCH symbol(s) in the said time slot, there can be one "candidate PSSCH starting symbol" in the said time slot, namely the said symbol Accordingly, the "PSSCH starting symbol" for a PSSCH transmission in the said time slot can be the said symbol

[0158] In some aspects, in a bandwidth segment configured with the said symbol and the said symbol (e.g., in a resource pool within the said bandwidth segment), "a time slot with two candidate PSSCH starting symbols (i.e., the said symbol and the said symbol )" can be equivalent to "a time slot without a PSFCH symbol".

[0159] In some aspects, when there is no risk of confusion, "candidate PSSCH starting symbol" and "candidate starting symbol" can be interchanged.

[0160] In some aspects, for a bandwidth segment configured with the symbol and the symbol when (or, only when) the type 1 PSSCH start symbol condition is satisfied, the symbol in the time slot can be used as a "PSSCH start symbol".

[0161] In some aspects, for a bandwidth segment configured with the symbol and the symbol when (or, only when) the type 1 PSSCH start symbol condition is not satisfied, the symbol in the time slot can be used as a "PSSCH start symbol".

[0162] For a PSSCH transmission of a UE in a time slot, the type 1 PSSCH start symbol condition may at least partially include one or more of the following (e.g., any combination in an "AND" or "OR" manner):

[0163] · The time slot is a sidelink time slot.

[0164] · There is no PSFCH symbol in the time slot.

[0165] · There are two "candidate PSSCH start symbols" in the time slot.

[0166] · The UE failed to access the channel(s) corresponding to the PSSCH transmission before the symbol in the time slot.

[0167] · The UE failed to access some or all of the channel(s) corresponding to the PSSCH transmission before the symbol in the time slot.

[0168] · The channel access performed for the PSSCH transmission experienced a channel access failure before the symbol

[0169] in the time slot.

[0170] · The UE did not perform the PSSCH transmission due to a channel access failure before the symbol in the time slot. (For example, in this case, the "PSSCH start symbol" of the PSSCH transmission is the symbol )

[0171] · The UE did not perform the PSSCH transmission with the symbol in the time slot due to a channel access failure

[0172] Perform the PSSCH transmission as the "PSSCH start symbol".

[0173] · The UE does not use the symbol in the time slot Perform the PSSCH transmission as the "PSSCH start symbol". (For example, in this case, the UE does not use the symbol in the time slot as the "PSSCH start symbol"

[0174] The reason for performing the PSSCH transmission may be a corresponding channel access failure, or it may be other reasons)

[0175] In some aspects, in a bandwidth segment where the symbol and the symbol are not configured (for example, in a resource pool in the bandwidth segment), there may be one candidate PSSCH start symbol in a time slot, that is, the symbol Accordingly, the "PSSCH start symbol" of a PSSCH transmission in the time slot may be the symbol

[0176] In some aspects, the symbol and the symbol may be applicable to (or, applicable to and only applicable to) operations with shared spectrum channel access.

[0177] In some aspects, the symbol and the symbol may be applicable to (or, applicable to and only applicable to) unlicensed spectrum.

[0178] In some aspects, if a UE fails to access the corresponding channel(s) before the expected transmission(s), the physical layer of the UE may trigger an LBT failure notification, unless there are two candidate start symbols in the time slot where the expected transmission is located, and the corresponding channel access failure occurs before the first candidate start symbol in the time slot.

[0179] In some aspects, if a UE fails to access part or all of the corresponding channel(s) before the expected transmission(s), the physical layer of the UE may trigger an LBT failure notification, unless there are two candidate start symbols in the time slot where the expected transmission is located, and the corresponding channel access failure occurs before the first candidate start symbol in the time slot.

[0180] In some aspects, the physical layer of a UE may determine whether to notify its higher layer of a channel access failure according to certain condition(s), that is, the physical layer of the UE may determine whether to trigger an LBT failure notification for the channel access failure according to the condition (for example, this may be applicable to channel access performed for part or all of PSCCH transmission(s), PSCCH / PSSCH transmission(s), PSSCH transmission(s), PSFCH transmission(s), S—SSB transmission(s)). Specifically, for example, the physical layer of the UE may perform one or more of the following:

[0181] · In a bandwidth segment configured with the symbol and the symbol (for example, in a resource pool in the bandwidth segment), for a PSSCH transmission(s) in a time slot having two candidate PSSCH start symbols (i.e., the symbol and the symbol ) where the "PSSCH start symbol" is the symbol , the channel access failure generated in the channel access for the PSSCH transmission(s) will not trigger an LBT failure notification.

[0182] · In a bandwidth segment configured with the symbol and the symbol (for example, in a resource pool in the bandwidth segment), when (or, only when)

[0183] a PSSCH transmission(s) in a time slot having two candidate PSSCH start symbols (i.e., the symbol and the symbol ) where the "PSSCH start symbol" is the symbol is performed, for the channel access failure generated in the channel access for the PSSCH transmission(s) in the time slot where the

[0184] "PSSCH start symbol" is the symbol , it will not trigger an LBT failure notification.

[0185] · In a bandwidth segment configured with the symbol and the symbol in a bandwidth segment (e.g., in a resource pool within the bandwidth segment), when (or, only when)

[0186] In a time slot with two candidate PSSCH start symbols (i.e., the symbol and the symbol ), when the PSSCH transmission(s) with the "PSSCH start symbol" being the symbol is not executed due to a channel access failure, the channel access failure occurring during the channel access performed for the PSSCH transmission(s) with the "PSSCH start symbol" being the symbol will trigger an LBT failure notification.

[0187] In some aspects, under certain conditions (e.g., in one or more exceptional cases), the physical layer of a UE may notify only one of multiple channel access failures (e.g., multiple consecutive channel access failures within a period of time) to its higher layer, i.e., the physical layer of the UE may trigger an LBT failure notification for only one of the multiple channel access failures (e.g., any one; or the first one; or the last one) (e.g., this may apply to the channel access performed for some or all of the PSCCH transmission(s), PSCCH / PS SCH transmission(s), PSSCH transmission(s), PSFCH transmission(s), S-SSB transmission(s)). Specifically, for example, in a bandwidth segment configured with the symbol and the symbol , for the channel access performed for the PSSCH transmission(s) in a time slot with two candidate PSSCH start symbols (i.e., the symbol and the symbol ), only one of the channel access failures (if any) when the "PSSCH start symbol" is the symbol and the channel access failures (if any) when the "PSSCH start symbol" is the symbol will trigger an LBT failure notification.

[0188] In some aspects, under certain conditions (e.g., in one or more exceptional cases), the physical layer of a UE may trigger a single LBT failure notification for multiple channel access failures (e.g., multiple consecutive channel access failures within a period of time), where the channel(s) indicated as inaccessible in the LBT failure notification may be the union (or intersection) of multiple "LBT failure channel sets", and each "LBT failure channel set" may be a set composed of the channel(s) that are inaccessible in one of the multiple channel access failures (e.g., this may apply to channel access performed for some or all of PSCCH transmission(s), PSCCH / PSSCH transmission(s), PSSCH transmission(s), PSFCH transmission(s), S-SSB transmission(s)). Specifically, for example, in a bandwidth segment configured with the symbol and the symbol (e.g., in a resource pool within the bandwidth segment), for channel access performed for PSSCH transmission(s) in a time slot with two candidate PSSCH start symbols (i.e., the symbol and the symbol ), the "PSSCH start symbol" being the symbol in the case of channel access failure (if any) and the "PSSCH start symbol" being the symbol in the case of channel access failure (if any) trigger a single LBT failure notification. For example, if the set of indices of the channels that are inaccessible when the "PSSCH start symbol" is the symbol is {0, 1}, and the set of indices of the channels that are inaccessible when the "PSSCH start symbol" is the symbol is {1, 2}, then the set of indices of the channels indicated as inaccessible in the triggered LBT failure notification may be {0, 1, 2} (i.e., the union of {0, 1} and {1, 2}), or may be {1} (i.e., the intersection of {0, 1} and {1, 2}).

[0189] In "inter-UE coordination" (IUC), a UE (e.g., denoted as UE-1) can send information related to resources (e.g., called "IUC information") to a peer UE (e.g., denoted as UE-2). Correspondingly, the UE-2 can perform one or more operations related to resource selection (or reselection) based on the received IUC information. Specifically, for example, in IUC scheme 1, the IUC information may indicate a set composed of preferred resources or non-preferred resources. Also, for example, in IUC scheme 2, the IUC information may indicate whether there is an expected or potential resource conflict on the resources indicated in the SCI of the UE-2.

[0190] In some aspects, in IUC scheme 1, the IUC information transmitted by the UE-1 can be autonomously triggered by the UE-1 according to certain conditions.

[0191] In some aspects, in IUC scheme 1, the IUC information transmitted by the UE-1 can be triggered by a request from the UE-2 (e.g., called an "explicit request").

[0192] Embodiment 1

[0193] The following combines Figure 1 to illustrate the method executed by the UE in Embodiment 1 of the present disclosure.

[0194] Figure 1 The flowchart corresponding to the method executed by the UE in Embodiment 1 of the present disclosure is shown.

[0195] As Figure 1 shown, in Embodiment 1 of the present disclosure, the steps executed by the UE include: step S101 and step S103.

[0196] Specifically, in step S101, channel access is performed.

[0197] For example, channel access is performed for one or more expected sidelink transmissions (e.g., denoted as ) on one or more channels (e.g., the corresponding channel set is denoted as ), where can be an integer greater than or equal to 1, It can correspond to the case of performing channel access on one channel. It can correspond to the case of performing channel access on multiple channels. It can be an integer greater than or equal to 1.

[0198] In some aspects, the sidelink transmissions in the set can be scheduled transmissions (e.g., in sidelink resource allocation mode 1, transmissions scheduled by the network via DCI).

[0199] In some aspects, the sidelink transmissions in the set can be configured transmissions (e.g., in sidelink resource allocation mode 1, sidelink transmissions corresponding to one or more sidelink configured grants).

[0200] In some aspects, the sidelink transmissions in the set can be the transmissions that the UE intends to perform on the resources (resource(s)) it selects (e.g., transmissions in sidelink resource allocation mode 2).

[0201] In some aspects, for sidelink transmissions it can be a PSCCH transmission, or can be a PSCCH / PSSCH transmission, or can be a PSSCH transmission, or can be a PSFCH transmission, or can be an S-SSB transmission.

[0202] In some aspects, all the sidelink transmissions in the set can be in the same bandwidth part (e.g., denoted as b0).

[0203] In some aspects, all the sidelink transmissions in the set can be in the same resource pool (e.g., denoted as e0) in the bandwidth part b0.

[0204] In some aspects, all the sidelink transmissions in the set can start at the same time on all the channels in the set . For example, all the sidelink transmissions in the set can start at the same symbol (e.g., denoted as ) in the same time slot (e.g., denoted as ).

[0205] In some aspects, the time slot can be a time slot in the resource pool e0.

[0206] In some aspects, the symbol and the symbol

[0207] In some aspects, the time slot has two candidate start symbols (i.e., the symbol and the symbol ).

[0208] In addition, in step S103, one or more operations are performed according to the result of the channel access.

[0209] In the case where the symbol is used as the "PSSCH start symbol", the set of channels that the UE fails to access before the sidelink transmission(s) in the set can be denoted as The set can be an empty set (i.e., ), or can be a non-empty set.

[0210] In the case where the symbol is used as the "PSSCH start symbol", the set of channels that the UE fails to access before the sidelink transmission(s) in the set can be denoted as The set can be an empty set (i.e., ), or can be a non-empty set.

[0211] For example, for if the channel access is successful (e.g., the UE successfully accesses the channel before the symbol ), then all the sidelink transmissions in the set are performed.

[0212] Another example, for if the channel access fails (e.g., the UE fails to access the channel before the symbol ), then no sidelink transmission in the set is performed.

[0213] Another example, for and it is jointly determined whether to perform sidelink transmission according to the results of the channel access procedures respectively performed on one or more channels in the set

[0214] ​For another example, if the type 1 channel access condition is satisfied, the physical layer notifies the higher layer of the type 1 channel access information.

[0215] The type 1 channel access condition may at least partially include one or more of the following (for example, any combination in the form of "AND" or "OR"):

[0216] · The set is a non-empty set.

[0217] · The set is equal to the set

[0218] · Some or all of the sidelink transmissions in the set are not executed due to channel access failure when using the symbol as

[0219] the "PSSCH start symbol".

[0220] · The set All of the sidelink transmissions in the set are not executed due to channel access failure when using the symbol

[0221] as the "PSSCH start symbol".

[0222] · The set is a non-empty set.

[0223] · The set is equal to the set

[0224] · Some or all of the sidelink transmissions in the set are not executed due to channel access failure when using the symbol as

[0225] the "PSSCH start symbol".

[0226] · The set All of the sidelink transmissions in the set are not executed due to channel access failure when using the symbol

[0227] as the "PSSCH start symbol".

[0228] · The number of LBT failure notifications triggered in the time slot has not reached the

[0229] · For the bandwidth segment b0, in the time slot The number of LBT failure notifications triggered in has not reached the

[0230] · For the resource pool e0, in the time slot The number of LBT failure notifications triggered in has not reached the

[0231] · The set The sidelink transmissions in include PSCCH transmission(s).

[0232] · The set The sidelink transmissions in include PSCCH / PSSCH transmission(s).

[0233] · The set The sidelink transmissions in include PSSCH transmission(s).

[0234] · The set The sidelink transmissions in include PSFCH transmission(s).

[0235] · The set The sidelink transmissions in include S-SSB transmission(s).

[0236] · The set The sidelink transmissions in are PSCCH / PSSCH transmission(s).

[0237] · The set The sidelink transmissions in are PSSCH transmission(s).

[0238] · The is equal to 1.

[0239] The type 1 channel access information may at least partially include one or more of the following:

[0240] · An indication of channel access failure (i.e., a channel access failure has occurred).

[0241] · The set

[0242] · The set The set of RB sets corresponding to.

[0243] In some aspects, Embodiment 1 of the present disclosure may be applicable to operations with shared spectrum channel access.

[0244] In some aspects, Embodiment 1 of the present disclosure may be applicable to unlicensed spectrum.

[0245] In some aspects, Embodiment 1 of the present disclosure may be executed by the physical layer of the UE.

[0246] In some aspects, Embodiment 1 of the present disclosure may be applicable to sidelink resource allocation mode 1.

[0247] In some aspects, Embodiment 1 of the present disclosure may be applicable to sidelink resource allocation mode 2.

[0248] Thus, according to Embodiment 1, the present disclosure provides a method, wherein in an operation with shared spectrum channel access, for a case where there are two candidate starting symbols in a time slot, only a LBT failure notification is triggered for a channel access failure (if any) occurring before the second candidate starting symbol, and not for a channel access failure (if any) occurring before the first candidate starting symbol, improving the accuracy of continuous LBT failure detection and avoiding unnecessary continuous LBT failures.

[0249] Embodiment 2

[0250] The following Figure 2 is used to illustrate the method executed by a UE (e.g., denoted as UE-A) in Embodiment 2 of the present disclosure.

[0251] Embodiment 2 of the present disclosure may include some or all of the steps of a "first IUC physical layer process", wherein the first IUC physical layer process may be at least partially used to determine a resource set (e.g., denoted as ) for the transmission of another UE (e.g., denoted as UE-B1).

[0252] The set may be composed of preferred resource(s) (correspondingly, the set may be referred to as a "preferred resource set"), or may be composed of non-preferred resources (correspondingly, the set may be referred to as a "non-preferred resource set").

[0253] In some aspects, the set may correspond to some or all of the IUC information in IUC scheme 1.

[0254] In some aspects, the set may be determined for the transmission of one or more transport blocks, wherein if the set If it is a set of prioritized resources, each of the one or more transport blocks can be referred to as a "Type 1 transport block"; if the set is a set of non-prioritized resources, each of the one or more transport blocks can be referred to as a "Type 2 transport block".

[0255] In some aspects, the first IUC physical layer procedure can be part of IUC Solution 1.

[0256] In some aspects, the first IUC physical layer procedure can be triggered by the UE-A itself (e.g., triggered by a higher layer of the UE-A).

[0257] In some aspects, the first IUC physical layer procedure can be triggered by an "explicit request" from another UE (e.g., denoted as UE-B2) received by the UE-A. In some aspects, the "explicit request" can be carried in an SCI format 2-C. In some aspects, the "explicit request" can be carried in a MAC CE. In some aspects, the "explicit request" can be carried in an SCI format 2-C and a MAC CE carried in the corresponding PSSCH.

[0258] In some aspects, the UE-B1 and the UE-B2 can be the same UE.

[0259] Figure 2 A flowchart corresponding to the method performed by UE-A according to Embodiment 2 of the present disclosure is shown.

[0260] As Figure 2 shown, in Embodiment 2 of the present disclosure, the steps performed by the UE-A include: some or all of Step S201, Step S203, Step S205, and Step S207.

[0261] Specifically, in Step S201, receive one or more input parameters provided by a higher layer.

[0262] Some or all of the one or more input parameters can be provided by the higher layer when the first IUC physical layer procedure is triggered.

[0263] Some or all of the one or more input parameters can be predefined or configured parameters.

[0264] The one or more input parameters can be provided by the higher layer to the physical layer.

[0265] In some aspects, some or all of the one or more input parameters can only apply to the case where the set is a set of prioritized resources.

[0266] In some aspects, some or all of the one or more input parameters may only apply to the set in the case of a non-preferred resource set.

[0267] The one or more input parameters may at least partially include one or more of the following:

[0268] · A resource pool from which to determine the resources in the set such as denoted as e1.

[0269] · A resource selection window in which to determine the resources in the set such as denoted as [n + T1, n + T2], where, for example, n may represent a time slot index, T1 may represent a time slot offset, and T2 may represent another time slot offset.

[0270] · A resource set type, such as denoted as rst1. The rst1 may indicate one of "preferred resource set" and "non-preferred resource set".

[0271] · A set of persistent LBT failure RB sets, such as denoted as the set may be composed of RB Set(s) that have been indicated as persistent LBT failures.

[0272] In some aspects, the resource selection window may be indicated by the "explicit request". For example, the resource selection window may be indicated by a "Resource selection window location" field. The "Resource selection window location" field may be the concatenation of the start time location and the end time location of the resource selection window.

[0273] In some aspects, all RB sets in the set may be in the same bandwidth segment (such as denoted as b1). In some aspects, the resource pool e1 may be a resource pool in the bandwidth segment b1.

[0274] In some aspects, the set may be indicated by the "explicit request".

[0275] In some aspects, the set may be determined by the higher layer of UE-A itself.

[0276] In some aspects, the set It can correspond to the higher layer parameter rbSetsWithConsecutiveLBTFailure or the higher layer parameter rbSetsWithConsistentLBTFailure.

[0277] In some aspects, the set can only apply to the case where the set is a set of priority resources.

[0278] In some aspects, the set can only apply to the case where the set is a set of non-priority resources.

[0279] In some aspects, the set can only apply to operations with shared spectrum channel access.

[0280] In some aspects, the set can only apply to unlicensed spectrum.

[0281] In addition, in step S203, at least partially according to the one or more input parameters, a set composed of priority resources or non-priority resources is determined (i.e., the set ).

[0282] In some aspects, the type of the set can be determined at least partially according to the parameter rst1. For example, if the parameter rst1 indicates "priority resource set", then the set is a priority resource set; another example is that if the parameter rst1 indicates "non-priority resource set", then the set is a non-priority resource set.

[0283] In some aspects, if the set is a non-priority resource set, then any resource(s) that meet the type 1 non-priority resource condition are non-priority resources. For example, any resource that meets the type 1 non-priority resource condition can be regarded as an element in the set .

[0284] For the resource res x , the type 1 non-priority resource condition can at least partially include one or more of the following (for example, any combination in the way of "AND" or "OR"):

[0285] · The resource res x is in the resource pool e1.

[0286] · The resource resx Within the resource selection window.

[0287] · The "explicit request" indicates the resource selection window, and the resource res x Within the resource selection window.

[0288] · The resource res x Satisfies at least one type 1a non-priority resource condition, where each type 1a non-priority resource condition can be One of a predefined or configured set of type 1a non-priority resource conditions, where Can be a predefined or configured integer (e.g., Another example, Another example, Another example, Another example, Another example, ).

[0289] The Set of type 1a non-priority resource conditions can be successively referred to as the "first type 1a non-priority resource condition", the "second type 1a non-priority resource condition",..., the " Type 1a non-priority resource condition".

[0290] For the resource res x , the first type 1a non-priority resource condition can at least partially include one or more of the following (e.g., in any combination using "AND" or "OR"):

[0291] · The resource res x The time slot in which it is located is a time slot in which UE-A does not expect to perform sidelink reception due to half-duplex operation.

[0292] · UE-A is the destination UE of a type 2 transport block.

[0293] In some aspects, for the resource res x , the second type 1a non-priority resource condition can at least partially include one or more of the following (e.g., in any combination using "AND" or "OR"):

[0294] · A continuous LBT failure detection and recovery process (or referred to as "continuous LBT failure recovery process") is configured in the higher layers.

[0295] · The RB Set(s) to which the resource resx belongs is included in the set .

[0296] · The resource res x One or more RB sets (RB Set(s)) where it is located are included in the set .

[0297] · The resource res x Some or all of the RB set (RB Set(s)) where it is located are included in the set .

[0298] · The RB set (RB Set(s)) associated with the resource resx is included in the set .

[0299] · The resource res x One or more RB sets (RB Set(s)) associated with it are included in the set .

[0300] · The resource res x Some or all of the RB set (RB Set(s)) associated with it are included in the set .

[0301] In some aspects, the second type 1a non-preferred resource condition may apply to (or, apply to and only apply to) operations with shared spectrum channel access.

[0302] In some aspects, the second type 1a non-preferred resource condition may apply to (or, apply to and only apply to) unlicensed spectrum.

[0303] In addition, in step S205, the set composed of preferred resources or non-preferred resources (i.e., the set ) is reported to a higher layer.

[0304] In addition, in step S207, IUC information is transmitted to another UE.

[0305] For example, the IUC information is transmitted to the UE-B1.

[0306] For another example, the IUC information is transmitted to the UE-B2.

[0307] In some aspects, the IUC information may include the set

[0308] In some aspects, the IUC information may include the set

[0309] In some aspects, Embodiment 2 of the present disclosure may apply to operations without shared spectrum channel access.

[0310] In some aspects, Embodiment 2 of the present disclosure can be applicable to licensed spectrum.

[0311] In some aspects, Embodiment 2 of the present disclosure can be applicable to operations with shared spectrum channel access.

[0312] In some aspects, Embodiment 2 of the present disclosure can be applicable to unlicensed spectrum.

[0313] In some aspects, Embodiment 2 of the present disclosure can be applicable to sidelink resource allocation mode 2.

[0314] In some aspects, Embodiment 2 of the present disclosure can be executed by the physical layer of the UE-A.

[0315] In Embodiment 2 of the present disclosure, unless otherwise specified, the "physical layer" refers to the physical layer of the UE-A.

[0316] In Embodiment 2 of the present disclosure, unless otherwise specified, the "higher layer" refers to the higher layer of the UE-A (for example, including part or all of the MAC layer and the RRC layer).

[0317] Thus, according to Embodiment 2, the present disclosure provides a method, in which, for operations with shared spectrum channel access, when determining a non-preferred resource set for another UE, the resources in the RB set that are in the resource selection window and have been indicated to have continuous LBT failures are determined as non-preferred resources, improving the effectiveness of non-preferred resource decisions and improving the performance of IUC Scheme 1.

[0318] Variant

[0319] Next, use Figure 3 to illustrate a user equipment that can execute the method performed by the user equipment as described in detail above in the present disclosure.

[0320] Figure 3 is a block diagram showing the user equipment involved in the present disclosure.

[0321] As Figure 3 shown, the user equipment UE30 includes a processor 301 and a memory 302. The processor 301 can include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 302 can include, for example, volatile memory (such as random access memory RAM), a hard disk drive (HDD), non-volatile memory (such as flash memory), or other memories, etc. Program instructions are stored on the memory 302. When executed by the processor 301, these instructions can execute the above method performed by the user equipment as described in detail in the present disclosure.

[0322] The methods and related devices of the present disclosure have been described above in connection with the preferred embodiments. Those skilled in the art can understand that the methods shown above are merely exemplary, and the embodiments described above can be combined with each other without conflict. The methods of the present disclosure are not limited to the steps and sequences shown above. The network nodes and user equipment shown above may include more modules. For example, they may also include modules that can be developed or will be developed and can be used in base stations, AMF (Access and Mobility Management Function), UPF (User Plane Function), MME (Mobility Management Entity), S-GW (Serving Gateway), or UE, etc. The various identifiers shown above are merely exemplary rather than restrictive, and the present disclosure is not limited to the specific cells that are examples of these identifiers. Those skilled in the art can make many changes and modifications according to the teachings of the illustrated embodiments.

[0323] Those skilled in the art should understand that any set is a subset of itself; the empty set is a subset of any set; part or all of a mathematical expression, mathematical equation, or mathematical inequality can be simplified, transformed, or rewritten to a certain extent. For example, combining constant terms, swapping two addition terms, swapping two multiplication terms, moving a term from the left side to the right side of an equation or inequality after changing its sign, or moving a term from the right side to the left side of an equation or inequality after changing its sign, etc. The mathematical expressions, mathematical equations, or mathematical inequalities before and after the simplification, transformation, or rewriting can be considered equivalent.

[0324] It should be understood that the above embodiments of the present disclosure can be implemented by software, hardware, or a combination of both software and hardware. For example, various components inside the base station and user equipment in the above embodiments can be implemented by a variety of devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), complex programmable logic devices (CPLDs), etc.

[0325] In the present disclosure, a "base station" may refer to a mobile communication data and / or control switching center with a certain transmission power and a certain coverage area, for example, including functions such as resource allocation and scheduling, data reception, and transmission. A "user equipment" may refer to a user mobile terminal, for example, including terminal devices such as mobile phones and laptops that can communicate wirelessly with a base station or a micro base station.

[0326] In addition, the embodiments of the present disclosure disclosed herein can be implemented on a computer program product. More specifically, the computer program product is a product having a computer-readable medium encoded with computer program logic that, when executed on a computing device, provides related operations to implement the above technical solutions of the present disclosure. When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present disclosure. Such a setting of the present disclosure is typically provided as software, code, and / or other data structures, such as on a computer-readable medium such as an optical medium (e.g., CD-ROM), a floppy disk, or a hard disk, or other media such as firmware or microcode on one or more ROM or RAM or PROM chips, or a downloadable software image in one or more modules, a shared database, etc. The software or firmware or such a configuration can be installed on a computing device so that one or more processors in the computing device perform the technical solutions described in the embodiments of the present disclosure.

[0327] In addition, each functional module or each feature of the base station device and the terminal device used in each of the above embodiments can be implemented or executed by a circuit, and the circuit is generally one or more integrated circuits. The circuit designed to perform each function described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or a general integrated circuit, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic, or discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The above general-purpose processor or each circuit may be configured by a digital circuit or may be configured by a logic circuit. In addition, when advanced technologies capable of replacing current integrated circuits emerge due to the progress of semiconductor technology, the present disclosure can also use integrated circuits obtained by using such advanced technologies.

[0328] Although the present disclosure has been shown above in conjunction with the preferred embodiments of the present disclosure, those skilled in the art will understand that various modifications, substitutions, and changes can be made to the present disclosure without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be limited by the above embodiments, but should be defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment UE, characterized in that Comprising: Performing channel access on one or more channels for one or more expected sidelink transmissions; And, If partial or all of the one or more channels cannot be accessed before the start of the one or more expected sidelink transmissions, the physical layer notifies the higher layer of the channel access failure and the one or more channels that cannot be accessed, unless there are two candidate start symbols in the time slot where the one or more expected sidelink transmissions are located, and the channel access failure occurs before the first candidate start symbol in the time slot.

2. A user equipment, comprising: A processor; And A memory storing instructions, wherein the instructions, when run by the processor, perform the method according to claim 1.

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