CN117395806A

CN117395806A - Method performed by user equipment and user equipment

Info

Publication number: CN117395806A
Application number: CN202210777254.9A
Authority: CN
Inventors: 罗超; 赵毅男; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2024-01-12
Also published as: WO2024002245A1

Abstract

The invention provides a method executed by user equipment and the user equipment. The method performed by the user equipment comprises: determining reserved resources in a future time slot; and performing a channel access procedure for a SL transmission scheduled in the time slot before the start time of the time slot arrives; and in the channel access flow, when power detection is executed, the power on the frequency resource corresponding to the reserved resource is eliminated.

Description

Method performed by user equipment and user equipment

Technical Field

The present invention relates to a method performed by a user equipment and to a user equipment.

Background

In a wireless communication system, SL (sidelink, or referred to as a direct link, or simply as a sidelink, or simply as a direct link) communication may be performed between UEs (User Equipment). SL communications may include general D2D (device-to-device) communications, V2V (vehicle-to-vehicle) communications, V2X (vehicle-to-everything) communications, and so on.

To support SL communication over licensed spectrum (1 icenspecum) and/or unlicensed spectrum (unlicensed spectrum), a series of problems, such as channel access (channel access) mechanisms, need to be solved; as another example, the physical layer channel and/or the structure of the signal; as another example, a physical layer flow (e.g., a synchronization flow, as well as feedback and/or determination mechanisms); as another example, allocation and/or management of resources; as another example, with other systems.

Prior art literature

Non-patent literature

Non-patent document 1: RP-152293,New WI proposal: support for V2V services based on LTE sidelink,3GPP TSG RAN Meeting#70

Non-patent document 2: RP-170798,New WID on 3GPP V2X Phase 2,3GPP TSG RAN Meeting#75

Non-patent document 3: RP-170855,New WID on New Radio Access Technology,3GPP TSG RAN Meeting#75

Non-patent document 4: RP-190766,New WID on 5G V2X with NR sidelink,3GPP TSG RAN Meeting#83

Non-patent document 5: RP-201385,WID revision: NR sidelink enhancement,3GPP TSG RAN Meeting#88e

Non-patent document 6: RP-213678,New WID on NR sidelink evolution,3GPP TSG RAN Meeting#94e

Disclosure of Invention

In order to solve at least a part of the above problems, the present invention provides a method executed by a UE and the UE, which greatly reduce the probability of blocking each other between different SL UEs when a channel is accessed, and improve the efficiency of SL communication in an unlicensed spectrum by excluding the power on the resources reserved by other detected UEs in the power detection link of the channel access procedure.

According to the present invention, there is provided a method performed by a user equipment, characterized by comprising: determining reserved resources in a future time slot; and performing a channel access procedure for a SL transmission scheduled in the time slot before the start time of the time slot arrives; and in the channel access flow, when power detection is executed, the power on the frequency resource corresponding to the reserved resource is eliminated.

Furthermore, according to the present invention, there is provided a user equipment comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the method described above.

Therefore, the invention provides a method, which eliminates the power on the resources reserved by other detected User Equipment (UE) in the power detection link of the channel access flow, greatly reduces the probability of mutually blocking each other among different SL UE when the channel is accessed, and improves the efficiency of SL communication in an unlicensed spectrum.

Drawings

The foregoing and other features of the invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings in which:

fig. 1 shows a flow chart corresponding to a method performed by a user equipment according to a first embodiment of the present invention.

Fig. 2 shows a block diagram of a UE (User Equipment) according to the present invention.

Detailed Description

The invention is described in detail below with reference to the drawings and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known techniques, which are not directly related to the present invention, are omitted to prevent confusion of the understanding of the present invention.

Various embodiments in accordance with the present invention are described in detail below with respect to an exemplary application environment of the 5G (alternatively referred to as NR ("New Radio") or 5G NR) wireless communication system specification and its subsequent evolution (e.g., 5G Advanced) as established by the 3GPP (3 rd Generation Partnership Project). However, it should be noted that the present invention is not limited to the following embodiments, but is applicable to many other wireless communication systems, for example, a wireless communication system after 5G, and also, for example, a 4G mobile communication system before 5G, such as LTE (Long TermEvolution ), LTE-Advanced Pro, and the like.

The terms given in the present invention may be named differently in different wireless communication systems, but the present invention uses uniform terms, and when applied to a specific system, may be replaced by terms used in the corresponding system.

In all examples and embodiments of the invention, unless otherwise specified:

● "higher layer(s), or upper layer (s)), may refer to one or more protocol layers or protocol sublayers above a given reference protocol layer or reference protocol sublayer (e.g., physical layer) in a given protocol stack (protocol stack). For example, for the physical layer, "higher layer" may refer to a MAC (Medium Access Control ) layer, or RLC (Radio Link Control, radio link control protocol) layer, or PDCP (Packet Data Convergence Protocol ) layer, or PC5 RRC (Radio Resource Control, radio resource control) layer, or PC5-S layer, or RRC layer, or V2X (Vehicle-to-everything) layer, or application layer, or V2X application layer, or the like. The reference protocol layer is a physical layer, unless otherwise specified.

● "configuration" may refer to one protocol layer (e.g., RRC layer) entity in one communication node (e.g., UE, or eNB, or gNB) providing configuration information to another protocol layer (e.g., physical layer) entity.

● "configuration" may refer to one communication node providing configuration information to another communication node (e.g., transmitting RRC signaling from a base station to a UE including the configuration information; e.g., transmitting PC5-RRC signaling from UE-a to UE-B including the configuration information).

● The "configuration" may include a "pre-configuration". The "pre-configuration" may refer to presetting corresponding configuration information at a specific storage location in the UE, or presetting corresponding configuration information at a specific storage location accessible to the UE.

● Constant T _c Can be defined as: t (T) _c ＝1/(Δf _max ·N _f ) Wherein Δf _max ＝480·10 ³ Hz，N _f ＝4096。

● The constant κ may be defined as: kappa=t _s /T _c =64, where T _s ＝1/(Δf _ref ·N _f，ref )，Δf _ref ＝15·10 ³ Hz，N _f，ref ＝2048。

● μ may represent a subcarrier spacing configuration (subcarrier spacing configuration), e.g., μ=0; Δf may represent a corresponding subcarrier spacing (subcarrier spacing, SCS), e.g., μ=0 for Δf=15 kHz.

● "symbol" refers to an OFDM (Orthogonal Frequency Division Multiplexing ) symbol.

●The number of slots in each subframe may be represented.

●The number of symbols in each slot may be represented.

● A resource (resource) may correspond to one or more of the following:

■ One or more parameters in the time domain (time domain). For example, a starting symbol of the resource; as another example, a starting time slot of the resource; as another example, the number of symbols occupied by the resource; as another example, the number of time slots occupied by the resource.

■ One or more parameters in the frequency domain (frequency domain). For example, a starting subchannel of the resource; as another example, a starting RB (resource block) of the resource; as another example, a starting subcarrier of the resource; as another example, the number of subchannels occupied by the resource; as another example, the number of RBs occupied by the resource; as another example, the number of subcarriers occupied by the resource.

■ One or more parameters in the code domain. For example, a cyclic shift (cyclic shift) value or a corresponding cyclic shift index corresponding to the resource; as another example, the cyclic shift pair (cyclic shift pair) value or corresponding cyclic shift pair index for the resource.

■ One or more parameters on the spatial domain. For example, the resource corresponds to a layer (layer), where one "layer" may refer to one MIMO (Multiple Input Multiple Output ) layer.

● "RB" may refer to a VRB (virtual resource block ), or PRB (physical resource block, physical resource block), or CRB (common resource block ), or IRB (Interlaced Resource Block, interleaved resource block).

● The "number" and "index" may be interchanged. For example, the number (number) of one RB may also be referred to as the index (index) of the RB. As another example, "one RB number (number) is 0" may also be expressed as "one RB index (index) is 0".

● The numbering of elements in a sequence (or array, or list, or ordered set, etc.) may start at 0. For example, the first RB of one RB set may be referred to as RB 0 of the RB set.

● An object (e.g., one subcarrier, one slot, one cyclic shift, etc.) may be represented by its index, e.g., CRB numbered 0 may be referred to as CRB 0.

● If a corresponding number is not indicated when referring to an object of a type, the number of objects may be one or more. For example, in "performing transmission on one channel", the "transmission" (transmission (s)) may correspond to one transmission, or a plurality of transmissions.

●Δ(x ₁ ，x ₂ ) Can be expressed as x ₁ And x ₂ Offset between (offset between x ₁ and x ₂ ) Wherein said x ₁ And said x ₂ May be two parameters (or variables) that may be compared, or two possible values of one parameter (or variable) (e.g., the x ₁ And said x ₂ May be two slots, or two subframes, or two frames, or two subcarriers, or two RBs, or two subchannels, etcEtc.).

●Δ(x ₁ ，x ₂ ) Can be equal to x ₂ -x ₁ . For example, record CRB set And-> Delta (x) ₁ ，x ₂ ) Can be equal to->

●Δ(x ₁ ，x ₂ ) Can be equal to idx (x ₂ )-idx(x ₁ ) Wherein idx (x) ₁ ) And idx (x) ₂ ) Respectively x ₁ And x ₂ Index of corresponding elements in the same set. For example, record CRB setAnd is also provided withDelta (x) ₁ ，x ₂ ) May be equal to 3-0=3.

●“x ₁ And x ₂ The offset between can also be referred to as x ₂ Relative to x ₁ Offset of x ₂ with respect to x ₁ Or offset of x ₂ relative to x ₁ )。

●“x ₁ And x ₂ The offset between can also be referred to as the slave x ₁ To x ₂ Offset from x ₁ to x ₂ )。

● If applicable, if delta (x ₁ ，x ₂ ) =d, x can be calculated as ₂ Denoted as x ₂ ＝ADD(x ₁ ，D)。

● If applicable, if delta (x ₁ ，x ₂ ) =d, x can be calculated as ₁ Denoted as x ₁ ＝SUBTRACT(x ₂ ，D)。

● The offset between the two subcarriers may be an offset between center frequencies of the two subcarriers.

● Modulo arithmetic (modular Operation) may be defined as r≡a mod N, where,

■ r is the remainder (remainders).

■ a=n×q+r, wherein,q may be referred to as an integer quotient of a and N (integer quoient).

■0≤r＜|N|。

● The units of microseconds can be noted as mus, or us.

● A transmission that has not yet begun to be performed (e.g., before the expected start time of the transmission has arrived) may be referred to as an "expected transmission" (intended transmission).

● One "sensing time slot duration" may represent the duration of the corresponding sensing time slot, or the sensing time slot itself.

● A "sensing time slot" may represent the sensing time slot itself, or the duration of the sensing time slot.

● Where applicable, "power detection" may be referred to as "energy detection" (energy detection), and accordingly, "detected power" may be referred to as "detected energy" (detected energy), and "power detection threshold" (power detection threshold) may be referred to as "energy detection threshold" (energy detection threshold).

● A "SL slot" may refer to a slot in which SL resources are configured or preconfigured. Wherein the "SL resources" may not include resources for the synchronization procedure (e.g., resources for transmitting S-SS/PSBCH (S-SS/Physical Sidelink Broadcast CHannel, or sidlink-Synchronization Signal/Physical Sidelink Broadcast CHannel) blocks), or include resources for the synchronization procedure.

● A "SL slot" may refer to a slot belonging to a certain SL resource pool.

● The set of SL symbols in a SL slot may be denoted asWherein the method comprises the steps ofRespectively representing the index of the corresponding symbol in the time slot, wherein Wherein the method comprises the steps ofIs the index of the first SL symbol in the slot (e.g. configured by the parameter SL-StartSymbol-r 16),is the number of SL symbols in the slot (e.g., configured by the parameter SL-LengthSymbiols-r 16).

● A SL transmission that multiplexes the PSCCH (Physical Sidelink Shared Channel, physical side shared channel) and its associated PSCCH (Physical Sidelink Control Channel, physical side control channel) in the same resource may be referred to as a "PSCCH/PSSCH transmission.

● The "first SL symbol" (or "first symbol") in a PSCCH/PSCCH transmission (or PSCCH transmission therein, or PSSCH transmission therein) corresponding to a resource allocation (resource allocation, or "side row allocation", sidelink allocation) may be the SL slot (T) corresponding to the resource allocation _SL，0 ) Symbols in (a)Or symbol->For example, when it is explicitly indicated that the resource allocation comprises "repeated symbols" in the corresponding PSCCH and/or PSSCH (duplicated symbol, i.e. symbol +. >) In the case of the "first SL symbol" may be the symbol +.>As another example, when it is not explicitly indicated that the resource allocation contains "repeated symbols" in the corresponding PSCCH and/or pscsch, the "first SL symbol" may refer to the symbol +.>As another example, when performing physical resource mapping for the PSCCH and/or PSSCH transmission (e.g., when transmitting the PSCCH/PSSCH transmission, or the corresponding PSCCH transmission, or the corresponding PSSCH transmission, in symbol +.>The resource elements in are copied to the symbol->Before) or before performing physical resource mapping for the corresponding PSCCH transmission and/or PSSCH transmission of said PSCCH/PSSCH transmissions, said "first SL symbol" may refer to the symbol->As another example, in determining the PSCCH/PSSCH transmission, or corresponding PSCCH transmission, or CPE (Cyclic Prefix Extension ) corresponding to corresponding pscsch transmission, the "first SL symbol" may refer to the symbol->As another example, the "first SL symbol" may refer to the symbol->

● The "first SL symbol" (or "first symbol") of one PSCCH/psch transmission (or corresponding PSCCH transmission, or corresponding psch transmission) may refer to the "first SL symbol" in the resource allocation to which the transmission corresponds.

● "one subcarrier in one SL BWP (or RB set, or guard band)" means one of the following:

■ The center frequency of the subcarrier is in the bandwidth of the SL BWP (or RB set, or guard band).

■ The bandwidth of the sub-carriers is in the bandwidth of the SL BWP (or RB set, or guard band).

■ The subcarrier is one subcarrier in the SL BWP (or RB set, or guard band).

● "one subcarrier is not in one SL BWP (or RB set, or guard band)" means one of the following:

■ The center frequency of the subcarrier is not in the bandwidth of the SL BWP (or RB set, or guard band).

■ The bandwidth of the sub-carriers is not in the bandwidth of the SL BWP (or RB set, or guard band).

■ The subcarrier is not one subcarrier in the SL BWP (or RB set, or guard band).

● "an S-SS/PSBCH block in an SL BWP (or set of RBs, or guard band)" may refer to one of the following:

■ The bandwidth of the S-SS/PSBCH block is in the bandwidth of the SL BWP (or RB set, or guard band).

■ All subcarriers of the S-SS/PSBCH block are in the SL BWP (or RB set, or guard band). For example, "one subcarrier in one SL BWP (or RB set, or guard band)" may be applied to each of the subcarriers, respectively.

■ All subcarriers of the S-SS/PSBCH block are subcarriers in the SL BWP (or RB set, or guard band).

● "an S-SS/PSBCH block is not in an SL BWP (or set of RBs, or guard band)" may refer to one of the following:

■ Any part of the bandwidth of the S-SS/PSBCH block is not in the bandwidth of the SL BWP (or RB set, or guard band).

■ Any sub-carriers of the S-SS/PSBCH block are not in the SL BWP (or RB set, or guard band). For example, for any subcarrier of the S-SS/PSBCH block, "the subcarrier is not in the SL BWP (or set of RBs, or guard band)".

■ Any sub-carriers of the S-SS/PSBCH block are not sub-carriers in the SL BWP (or RB set, or guard band).

● In the time domain, a "frame" (or "radio frame") can be a system frame (system frame), or a direct frame (direct frame). One frame number period (e.g. denoted as T _FNP ) May be a predefined or configured or preconfigured value, e.g., T _FNP =1024 frames. The duration of each frame may be T _f =10 milliseconds, which may contain 10 subframes, where each subframe has a duration T _sf =1 millisecond. Each subframe may containTime slots, e.g.)>The index of a slot in a subframe can be denoted +.> The index of a slot in a frame can be written asWherein (1)>Can be equal to 10.2 ^μ . The slot index in one frame number period may be denoted +.> Wherein->Can be equal to (e.g., 1024 (10. 2) ^μ ))。

5G (alternatively referred to as NR, new Radio) may operate in either licensed spectrum (e.g., 2010MHz-2025 MHz) or unlicensed spectrum (e.g., 5150MHz-5925MHz in part or whole, e.g., 5925-7125MHz in part or whole, and in part or whole, e.g., 5925-6425 MHz).

When operating in unlicensed spectrum, a 5G-capable communication node (alternatively referred to as a "node", e.g., a base station, such as a UE) may perform a "channel access procedure" on a "channel", or "shared-spectrum channel" (channel access procedure). Wherein a channel may correspond to a set of several consecutive Resource Blocks (RBs). Operations performed on one or more shared spectrum channels may be referred to as "operations with shared spectrum channel access" (operation with shared spectrum channel access). In contrast, operation on licensed spectrum may be referred to as "shared-nothing channel access operation" (operation without shared spectrum channel access).

One channel may correspond to one carrier (carrier), or a portion of one carrier. For example, a channel may correspond to a 20MHz bandwidth carrier; as another example, one channel may correspond to a lower frequency 20MHz in one 40MHz bandwidth carrier and another channel may correspond to a higher frequency 20MHz in the same carrier.

One channel access procedure may be used to evaluate whether one channel may be used to perform one or more transmissions (alternatively referred to as "evaluating whether one or more transmissions may be performed on one channel"), where the evaluating operation may be referred to as CCA (Clear Channel Assessment, clear channel evaluation). This mechanism of performing CCA before using one channel may be referred to as LBT (Listen Before Talk ).

In a channel access procedure, the status of a channel may be determined based on a "sensing" operation on the channel (e.g., as a result or output of the channel access procedure). For example, a channel state "idle" may indicate that a channel access was successful, or that a corresponding channel is available, or that one or more transmissions may be performed on the channel; as another example, a channel status of "busy" may indicate that a channel access failed, or that the corresponding channel is not available, or that no transmission can be performed on the channel. Specifically, for example, if the sensing result of the channel in the sensing slot duration (sensing slot durations) in one "deferral duration" is idle and the sensing result in the next N consecutive additional sensing slot durations (additional sensing slot duration (s)) are all idle, the sensing result of the channel may be determined to be idle. Wherein N may be an integer greater than or equal to 0; a sense time slot duration (e.g., denoted as T _sl ) May be a predefined or configured or preconfigured value, e.g., T _sl ＝9usThe method comprises the steps of carrying out a first treatment on the surface of the A delay duration (e.g. denoted as T _d ) Can be formed from a length T _f Time of (2) and m next _p′ A continuous sensing time slot composition, wherein T _f May be a predefined or configured or preconfigured value (e.g., T _f ＝16us)，m _p′ May be an integer greater than 0. The length of the section is T _f May start with a sensing time slot.

If the power detected on a channel is (e.g., denoted as X during a sensing time slot duration _detected ) Less than (or less than or equal to) a power detection threshold (e.g., denoted as X _thresh ) Is at least T _sl，thresh The channel may be considered idle for the sensing time slot duration, otherwise the channel may be considered busy for the sensing time slot duration. Wherein T is _sl,thresh May be a predefined or configured or preconfigured value, e.g., T _sl，thresh ＝4us。

If the corresponding channel cannot be accessed before the start time of an intended transmission (e.g., before the first symbol to which the transmission corresponds) (e.g., the channel cannot be accessed because the channel is "busy") then a "channel access failure" may be considered to have occurred, or, where applicable, referred to as a "LBT failure".

The transmission performed on the corresponding channel after performing the channel access procedure may be referred to as "channel occupancy" (Channel Occupancy, CO) and the corresponding duration may be referred to as "channel occupancy time" (Channel Occupancy Time, COT). A COT may be shared between one or more communication nodes, and accordingly, the time corresponding to the COT may include the time when the one or more communication nodes perform transmissions on the respective channels, as well as the time corresponding to a transmission interval (transmission gap) between such transmissions (e.g., when the duration of the transmission interval is less than or equal to 25 us).

The channel access procedure may be classified into various types according to purposes, applicable scenarios, etc. For example, if a pre-transmission sensing result is to be performedThe time spanned by a sense slot that is idle is noted asThen in "channel access procedure type 1",is random; in "channel access procedure type 2", ->Is determined. Channel access procedure type 1 may be used for non-shared COT or shared COT; channel access procedure type 2 may be used to perform channel access in a COT shared by one other communication node.

Channel access procedure type 2 may be as follows Is divided into a plurality of subtypes, for example, one or more of the following:

● Channel access procedure type 2A, wherein,or (F)>Or (F)>This can be applied to the interval between the corresponding transmission and the previous transmission (immediately preceding transmission) (e.g. denoted +.>) A condition is satisfied, for example,in another example, ->In another example, ->

● Channel access procedure type 2B, wherein,or,or (F)>Or,or (F)>This may apply to theCases where certain conditions are met, e.g.)>In another example, ->As another example of the use of a catalyst,in another example, ->In another example, ->

● Channel access procedure type 2C, in which the respective channel is not sensed before transmission is performed (e.g., this may correspond to). This can apply to said +.>A condition is satisfied, for example,in another example, ->

A "multi-channel access procedure" (multi-channel access procedure) may refer to a procedure that involves accessing multiple channels (e.g., marking their corresponding channel sets as CH) _acc ) One or more channel access procedures performed (e.g., performed in parallel) with one or more transmissions (e.g., multiple transmissions performed simultaneously) performed thereon. Wherein the "one or more channel access procedures" may be performed in a "target sensed channel set" (e.g., denoted as CH) _sns ＝{ch ₀ ，ch ₁ ，...，ch _Q-1 And Q may be an integer greater than or equal to 1). The set CH _sns May be equal to the set CH _acc Or otherwise defined (e.g., if the set CH _acc The carrier wave of the channel in the set is not configured with a guard band, and the set CH _sns May be equal to the set of all channels on the carrier). Specifically, for example, the set CH _sns And determining whether the one or more transmissions can be performed (e.g., for each of the one or more transmissions, the transmission can be performed if access results for all channels corresponding to the transmission are idle) based on the respective results. As another example, the set CH may be _sns Is selected (e.g., uniformly, randomly) for one channel ch _j And performs a channel thereonAccess procedure type 1, while in the set CH _sns Channel access procedure type 2 (e.g., channel access procedure type 2A, or channel access procedure type 2B, or channel access procedure type 2C) or one other channel access procedure than channel access procedure type 1, respectively, is performed on each of the other channels, and a determination is made as to whether the one or more transmissions can be performed based on the corresponding results.

For unlicensed spectrum, the set of available resource blocks in one channel may be referred to as one "RB set" (RB set). In one carrier (e.g., denoted as c), there may beSets of RBs, e.g. denoted rs respectively ₀ ，rs ₁ ，......，/>Wherein, pair-> rs _i The lowest numbered CRB (Common Resource Block ) and highest numbered CRB of (a) can be respectively noted asrs _i The number of RBs of (2) can be recorded as +.>Wherein->Can be equal toIn addition, alternatively, there may be +.>Are used for separating the->Guard bands (or "intra-cell guard bands") of the RB sets, e.g., denoted as gb, respectively ₀ ，gb ₁ ，......，/>Wherein, togb _j The lowest numbered CRB and highest numbered CRB of (2) may be respectively noted asgb _j The number of RBs of (2) can be recorded as +.>Juque Zhi>Can be equal toCan be used for separating RB set rs _j Sum RB set rs _j+1 . For example, in a carrier with a bandwidth of 40MHz, for a 15kHz SCS, there may be 216 consecutive RBs (e.g., with CRB numbers of 0,1, respectively, 215), and the 216 RBs may be divided into 3 subsets, corresponding to one RB set +.> A protective tape-> And an RB set +.>

The saidThe set of RB sets can be denoted +.>For a pair ofTwo adjacent RB sets (rs) _i And rs _i+1 ) There may be zero or one guard band in between. Said->The set of guard bands can be denoted +.>For a pair of If gb _j Is an empty set, the corresponding guard band may be considered to be absent. If pair is togb _j Are empty sets, then there may be considered no guard band between the RB sets of carrier c.

In carrier c can be configured withBWP (Bandwidth Part), e.g. BWP respectively ₀ ，bwp ₁ ，......，/>For-> bwp _k Can correspond toThe RB sets are, for example, respectively denoted +.>Wherein, pair-> Is the set RS _C One element of (a) and +.> bwp _k The lowest numbered CRB of (e.g. denoted +.>) Can be equal to->bwp _k The number of RBs (e.g., expressed as +.>) Can be equal to->Said->The RB set may be +>A contiguous set of RBs, e.g. p->a _k,l ＝a _k，O +l. For convenience, in case of no ambiguity (e.g. in an operation involving only one BWP), one can apply +.>Is marked asWill->Respectively rsa _o 、/>Said->The set of RB sets can be denoted +.>The set RS _BWP May be equal to the set RS _C Or equal to the set RS _C Is a subset of the group.

For unlicensed spectrum, certain restrictions may be imposed on the PSD (Power Spectral Density ) and/or OCB (Occupied Channel Bandwidth, occupied channel bandwidth) of the signal transmission in order to ensure fair sharing of the channel by different communication nodes. For example, the maximum PSD cannot exceed 10dBm/MHz. As another example, when using one channel, the bandwidth containing 99% of the transmission power must be greater than or equal to a particular percentage (e.g., 80%) of the nominal channel bandwidth (Nominal Channel Bandwidth). The restrictions (if any) may be formulated and enforced by regulatory authorities. The restrictions on PSD and/or OCB, if any, may be different in different countries or regions.

To meet the OCB limit, one wireless transmission may correspond to one or more "interlaces" (interlaces). For example, M can be defined _INT (M _INT More than or equal to 1) interweaving, the corresponding interweaving set isWherein, for M e {0,1,., M _INT -1, interleave int _m Can correspond to CRB set { M, M _INT +m，2M _INT +m，3M _INT +m，...}。M _INT May be a predefined or configured or preconfigured value.

M _INT The value of (a) may be related to the subcarrier spacing configuration μ (e.g., for μ=0, m _INT =10; for another example, for μ=1, m _INT ＝5)。

Configuring μ for the same subcarrier spacing, different "interlaces" may be defined for different purposes (e.g., different types of SL transmissions). For example, mu is allocated to the same subcarrier spacing, and an M is defined for S-SS/PSBCH transmission _INT Defining another M for PSCCH/PSSCH transmission and/or PSFCH transmission _INT Is a value of (2). For example, mu is allocated to the same subcarrier spacing, and an M is defined for S-SS/PSBCH transmission _INT No interlace is defined for PSCCH/PSSCH transmission and/or PSFCH transmission.

The set of one or more RBs occupied by one radio transmission may relate to one or more interlaces and one or more RB sets.

The RBs in one interlace may be referred to as IRBs. For example, at bwp _k In, interweave int _m The IRB numbers in the table can be respectively recorded as the sequence from the small to the large in frequency The corresponding CRB numbers can be denoted as +.>The corresponding PRB numbers can be denoted as +.>

IRB numberingAnd the corresponding CRB number->The relation of (2) can be recorded as +.>Wherein->Can be defined as:

IRB numberingAnd corresponding PRB number->The relationship of (2) can be recorded asWherein->Can be defined as:

recording deviceFor the set I _ALL Of (3), whereinMay be a continuous interleaving (e.g. form _l ＝m ₀ +l), or discontinuous interleaving. Record->For the set RS _BWP Is a subset of>May be a contiguous set of RBs (e.g. p +.>i _l ＝i ₀ +l), or a discontinuous set of RBs.Can represent the slave set I _MAP Sum set RS _MAP Mapping to a set containing one or more RBs. />May be defined as one of the following:

●

●(i.e.)>And->Is an intersection of (c) s).

●

Wherein,is the set RS _MAP All RBs in the aggregate of all RB sets in (or referred to as "the set RS _MAP A set of all RBs in a aggregate of all RB sets); />Is the set I _MAP All RBs corresponding to all interlaces in (or referred to as "the set I) _MAP A set of all RBs corresponding to all interlaces);is->And->Of (2), wherein->Is the set RS _MAP All RBs in the union of all guard bands (if any) between all sets of RBs (otherwise referred to as the set RS _MAP A set of all RBs in a union of all guard bands (if any) between all RB sets in a set).

For example, if M _INT ＝5，I _MAP ＝{int ₀ ，int ₁ "wherein int ₀ The corresponding CRBs are {10, 15, 20, }, int ₁ The corresponding CRBs are {11, 16, 21, }, RS _MAP ＝{rs ₀ ，rs ₁ }, wherein rs ₀ The corresponding CRB is {10, 11, 12,..59 }, rs ₁ The corresponding CRB is {66, 67, 68,..115 }, then

●

In response to this, the control unit,may be equal to one of the following:

●i.e., {10, 11, 12,..59, 66, 67, 68,..115 }.

●I.e.

{10，11，15，16，20，21，...，55，56，66，70，71，75，76，80，81，...，110，111，115}。

●I.e., {10, 11, 12,..115 }.

●I.e., {10, 11, 15, 16, 20, 21, }, 110, 111, 115}.

For different purposes (e.g. resource mapping for different channels or signals),the definition of (c) may be different.

For unlicensed spectrum, after the channel access is successful, in order to avoid that other communication nodes also (simultaneously, or at a later point) detect that the channel is available and occupy the channel (thereby causing a collision), the corresponding transmission should be started as soon as possible. On the other hand, in a communication system (e.g., a communication system using NR technology), the start time of a transmission may not be arbitrary but limited to discrete points in time. For example, the start time may be located only at the start time of one slot, or only at the start time of a particular symbol (e.g., the first SL symbol) in one slot, which greatly limits the flexibility of performing transmissions in the unlicensed spectrum. This problem can be ameliorated to some extent by introducing CPE (Cyclic Prefix Extension), cyclic prefix extension) functionality. For example, assume that t=0 corresponds to the start time of one subframe, and the number within the subframe is The start time of the symbols of (2) is->The symbol length (or "symbol duration") is +.>In case of CPE, one starting symbol is l ₀ Transmission of (e.g. noted as) Can start from->(instead of +.in case of unused CPE)>) Wherein, in->The time-continuous signal (time-continuous signal) of (2) can be defined as +.>

Wherein,

●may be in seconds.

●May be in seconds.

●Including the length of CP in the corresponding symbol (e.g. denoted +.>) And the length of the core OFDM symbol (e.g. denoted +.>)。

●Representing the symbol l ₀ At->A continuous time signal.

● p denotes the corresponding antenna port.

● μ is the corresponding subcarrier spacing configuration.

●May be referred to as CPE length (or CPE duration).

●May be in seconds.

For the transmission ofThe CPE length->May be defined in one of the following ways:

●

wherein,

● For differently scheduled (or triggered) transmissions,the definition of (c) may be different. For example, a dynamic grant (dynamic grant) scheduled transmission,/->As another example, a transmission scheduled for a configuration grant (configured grant), is +.>

●May be equal to the symbol l ₀ Before->The symbols (the->symbol(s)immediately preceding symbol l ₀ ) Is the sum of the lengths of (a) and (b). For example, a- >Can be defined as(or->Specifically, for example, a->Correspondingly, the->The symbol "corresponds to the symbol l ₀ Is a preceding symbol (the symbol immediately preceding symbol l) ₀ For example denoted by the symbol l _0，m1 ). As another example of the use of a catalyst,correspondingly, the->The symbol "corresponds to the symbol l ₀ Is (e.g. denoted as symbol l _0，m1 ) And the symbol l _0，m1 Is (e.g. denoted as symbol l _0，m2 ). Wherein,

■may be a predefined or configured or preconfigured value. For example, a->

■May be a value indicated by DCI (Downlink Control Information) or SCI (Sidelink Control Information), wherein the indicated value may be an element of a predefined or configured or preconfigured set.

■May be related to mu. For example, a->As another example, for μ ε {0,1}, +.>As another example, for μ=2, +.>

●Can be equal to->Wherein (1)>Can be equal to-> (or->) Or a predefined or configured or preconfigured symbol index in a subframe; />May be equal to mu or a pre-defined or configured or pre-configured subcarrier spacing configuration. For example, the number of the cells to be processed, in another example, ->

●May be equal to the symbol l ₀ Before->The sum of the lengths of the symbols minus an offset value related to channel access and/or timing advance (e.g. denoted +. >) Or equal to->Minus->Or equal to->Minus->For example, a->Can be defined as(alternatively,) Or defined as +.>Or is defined as +.> Wherein,

■may be a predefined or configured or preconfigured value. For example, a->

■May be a value indicated by DCI or SCI, wherein the indicated value may be an element of a predefined or configured or preconfigured set.

■Can be satisfied->(or->) Is the largest integer of (a).

■Can be satisfied->Is the largest integer of (a).

■May be in seconds.

■Can be combined with->Related to the following. For example, pair->Corresponds to +.>Is a unique value of (a).

■May be a predefined or configured or preconfigured value. For example, the number of the cells to be processed,in another example, ->In another example, ->As another example of the use of a catalyst,in another example, ->In another example, ->

■ A given may be indicated by a configured value or a value indicated in DCI or a value indicated in SCI The value of (e.g.)>) And a given ∈>The value of (e.g.)>) A composed pairing, wherein the pairing may be an element in a predefined or configured or preconfigured set.

■May be related to mu.

■Can be configured or indicated as equal +.>(alternatively,) Accordingly, the->

● For differently scheduled (or triggered) transmissions,some or all of the definitions of (c) may be different. For example, for a dynamically licensed scheduled transmission, < >>Is a predefined mu-independent value or a configured or preconfigured value. As another example, transmission scheduled for one configuration grant,/->

The transmissionIs->Is (or is called "said transmission +.>Is not permitted by the corresponding codeThe value of (2) may be noted +.>Wherein the set->The largest element in (2) may be noted as

For the transmission ofCan correspond to an upper bound (e.g. called said transmission +.>For example, denoted as +.>). For example, a->Can be equal to->In another example, ->May be a larger than said set +.>A value of any element in the list.

Can be combined with l ₀ Related to, or associated with, l ₀ Irrespective of the fact that the first and second parts are.

May be mu-related or mu-independent.

May be equal to one of the following:

●

●is the maximum value of (a).

●Is the maximum value of (a).

●

●Is the maximum value of (a).

●(or->)。

●Is the maximum value of (a).

●

●(or->)。

For differently scheduled (or triggered) transmissions,the definition of (c) may be different. For example, for a dynamically licensed scheduled transmission, < >>(or->). As another example, transmission scheduled for one configuration grant,/->(alternatively,)。

example one

A method performed by a user equipment according to a first embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, in a first embodiment of the present invention, the steps performed by the user equipment UE include: step S101 and step S103.

Specifically, in step S101, a reserved resource (reserved resource (S)) is determined. For example, in time slotsBefore (e.g. comprising said time slot +.>As another example of the use of a catalyst,excluding said time slot->) Determining a resource pool rp _u Time slot->Wherein the time slot is +.>May be a time slot later than the time slot +.>Is a time slot of (2); i e {0, 1., T' _max -1}, accordingly, the resource pool rp _u The set of time slots within a frame number period can be noted +. >

The set of reserved resources may be noted asThe number of reserved resources contained therein can be recorded asWherein (1)>May be an integer greater than or equal to 0. Specifically, if->Then->Can be marked as +.>If->Then->Can be an empty set +.>For a pair ofResource->Can correspond to the time slot +.>Middle slave subchannel->Start->Successive sub-channels (e.g. denoted as sub-channel set +.> ) Wherein->May be an integer greater than or equal to 1. Said collection->Any two of the reserved resources may overlap (e.g., overlap on at least one subchannel) or may not overlap. The set ofThe union of (2) can be noted +.>

The resource pool rp _u The set of all RB sets in (1) can be written as Wherein->May be an integer greater than or equal to 1.

The set RS _RP，u Each RB set in (a) may correspond to a channel (i.e., a "channel" on which channel access may be performed), e.g., forThe corresponding channel can be noted asThe set RS _RP，u The corresponding channel set may be denoted +.>

The time slotMay be the resource pool rp _u Or not the resource pool rp _u Is provided. Said time slot->And said time slot->The slot offset between can be noted +. >Where D may be a predefined or configured or preconfigured value or may be determined by one or more predefined or configured or preconfigured values.

For a pair ofSaid reserved resource->May be in the slot->One resource indicated in SCI detected in (1), where m _j ∈{0，1，...，T′ _max -1}, and the time slot +.>Earlier than the time slot->Alternatively, the time slot ∈>Not later than the time slot->The SCI may refer to the time slotA first stage SCI carried in a PSCCH transmission detected (e.g., the corresponding SCI format is SCI format 1-a), and/or a second stage SCI associated with the first stage SCI. The reserved resource r _j ^rsvd，i May be in one or more resources indicated in the SCIOne. For example, the one or more resources may be indicated by a "time resource allocation" (Time resource assignment) field and/or a "frequency resource allocation" (Frequency resource assignment) field and/or a "resource reservation period" (Resource reservation period) field in the SCI.

Further, in step S103, a channel access procedure is performed. For example, to determine whether or not the resource pool rp can be in the resource pool _u A SL transmission is performed, and a channel access procedure is performed a period of time before a start time of the slot.

The channel access procedure may be used for one channel. For example, the number of the cells to be processed,correspondingly, to the channelThe channel access procedure is performed (e.g., using channel access procedure type 1).

The channel access procedure may be a "multi-channel access procedure". For example, the number of the cells to be processed,accordingly, for the set CH _RP，u The multi-channel access procedure is performed for the channels in (a).

For a pair ofIn the case of channel->In the channel access procedure performed, the sensing operation (e.g., power detection and/or power comparison) may be related to the reserved resources determined in the step S101.

Specifically, for example, if the first sensing time interval (e.g., denoted as) For the channelPower detection is performed and part or all of the first sensing time interval and a first resource reservation time interval (e.g. denoted +.>) Frequency exclusion (alternatively referred to as frequency resource exclusion) may be performed in the power detection. Wherein,

●and->The relation of (2) may be->

●And->The relation of (2) may be->

● The term "frequency exclusion" may refer to the process of determining the channelUpper detected power X _detected When power on frequencies corresponding to one or more resources is excluded (frequencies overlapping two or more resources are excluded only once). For example, the one or more resources may be defined in one of the following ways:

■ The set ofIf any).

■ The set ofIn the channel->The corresponding RB set (i.e.)>) Resources within (if any). />

■ The set ofIs a resource in (a) a resource in (b).

● The first resource reservation time intervalCan be associated with the time slot->Related to the following. For example, the number of the cells to be processed,

■can be equal to->Wherein,

◆can be equal to said time slot +.>Is a starting time of (c).

◆Can be equal to said time slot +.>Is the start time of the first symbol of (c).

◆Can be equal to said time slot +.>Is the first SL symbol (i.e. symbol +.>) Is a starting time of (c).

◆Can be equal to said time slot +.>Is the second SL symbol (i.e., symbolNumber->) Is a starting time of (c).

◆Equal to the time slot->Is used for the start time of the first SL symbol for PSCCH/psch transmission.

◆Equal to the time slot->Is used for the start time of the second SL symbol for PSCCH/psch transmission.

◆May be a predefined or configured or preconfigured value. For example, a->

◆Can be equal to said time slot +.>CPE upper bound corresponding to the first symbol of (c).

◆Can be equal to said time slot +.>Is the first SL symbol of (2)Corresponding CPE upper bound.

◆Can be equal to said time slot +.>CPE upper bound corresponding to the second SL symbol of (b).

■Can be equal to said time slot +.>End time of (2).

■Can be equal to said time slot +.>End time of last symbol of (c).

■Can be equal to said time slot +.>End time of the penultimate symbol of (c).

■Can be equal to said time slot +.>End time of last SL symbol of (c).

■Can wait forIn the time slot->End time of the second last SL symbol.

■Can be equal to said time slot +.>End time of last SL symbol for PSCCH/psch transmission. />

■Can be equal to said time slot +.>End time of the second last SL symbol for PSCCH/psch transmission.

In the sensing operation related to the channel access procedure, a power detection threshold value X _thresh May be related to the reserved resources determined in the step S101 or may be unrelated to the reserved resources determined in the step S101. For example, X _thresh ≤X _{i，Thresh_max} The method comprises the steps of carrying out a first treatment on the surface of the As another example, X _thresh ≤X _{Thresh_max} . Wherein X is _{i，Thresh_max} Can be equal toWherein BW is _i，excluded And->BW is the same (e.g., MHz in all cases) _i，excluded It may be that in the "frequency exclusion", the sum of bandwidths corresponding to all the excluded frequency resources (the frequency overlapping two or more resources is calculated only once); />May be the channel->Is X _{Thresh_max} Can correspond to not being +_ to the channel in the sense operation>Maximum power detection threshold when performing "frequency exclusion", e.g. X _{Thresh_max} May be defined as one or more of the following:

● If it can be ensured for a long period of time that no other technology shares the channel(e.g. by the level of supervision being guaranteed), then +.>If there is a maximum power detection threshold required by regulatory regulations, X _r Is equal to the maximum power detection threshold; otherwise X _r ＝T _max +10dB。

● If it cannot be guaranteed for a long period of time that no other technology shares the channelThen

● If a maximum power detection threshold is configured (e.g., by the parameter maxEnergyDetectionThreshold), X _{Thresh_max} A configured maximum power detection threshold.

● If a maximum power detection threshold is not configured, a default power detection threshold (e.g., denoted as X 'is first determined' _{Thresh_max} ) Then, the first and second electrodes are connected,

■ If a power detection threshold offset is configured (e.g. by the parameter engydetectA tionethresholdoffset configuration), the default power detection threshold X 'is adjusted according to the configured offset value' _{Thresh_max} And X is _{Thresh_max} Equal to X 'after adjustment' _{Thresh_max} 。

■ Otherwise, X _{Thresh_max} ＝X′ _{Thresh_max} 。

Wherein T is _A ＝10dB，P _H ＝23dBm，P _TX Can be set to the UE in the channelOr set to be the maximum output power of the UE in the channel +.>Maximum output power of (when the value of the maximum output power corresponds to a section),/or- >

The default power detection threshold X' _{Thresh_max} May be determined in one or more of the following ways:

● If the "no other technology shared channel" flag is configured (e.g., by the parameter absenceofAnyOthertechnology configuration), then Wherein if there is a maximum power detection threshold required by regulatory regulations, X' _r Is equal to the maximum power detection threshold; otherwise X' _r ＝T _max +10dB。

● If the 'no other technology shared channel' flag is not configured, then

Alternatively, in the first embodiment of the present invention, the "reserved resources" may be determined for any one of the slots reserved or configured or preconfigured with SL resources, and is not limited to determining the "reserved resources" for the slots in one of the resource pools. Accordingly, one "reserved resource" may be a resource reserved by other UEs through the SCI, or a configured or preconfigured resource (e.g., a resource configured or preconfigured for transmission or reception of S-SS/PSBCH; e.g., a resource configured or preconfigured for transmission or reception of PSFCH), and the first resource reservation time interval may include a symbol corresponding to the "reserved resource", and optionally, a CPE upper bound of the first symbol corresponding to the "reserved resource".

Thus, according to the first embodiment, the present invention provides a method, which eliminates the power on the resources reserved by other detected UEs in the power detection link of the channel access procedure, so as to greatly reduce the probability of blocking each other between different SL UEs during channel access, and improve the efficiency of SL communication in the unlicensed spectrum.

Modification example

Next, a user equipment that can perform the method performed by the user equipment described in detail above of the present invention as a modification will be described with reference to fig. 2.

Fig. 2 is a block diagram showing a user equipment UE according to the present invention.

As shown in fig. 2, the user equipment UE20 comprises a processor 201 and a memory 202. The processor 201 may include, for example, a microprocessor, microcontroller, embedded processor, or the like. The memory 202 may 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 memory. The memory 202 has stored thereon program instructions. Which, when executed by the processor 201, may perform the above-described method performed by the user equipment as described in detail herein.

The method and the apparatus involved of the present invention have been described above in connection with preferred embodiments. It will be appreciated by those skilled in the art that the methods shown above are merely exemplary and that the embodiments described above can be combined with one another without contradiction. The method of the present invention is not limited to the steps and sequences shown above. The network nodes and user equipment shown above may comprise further modules, e.g. modules that may be developed or developed in the future, available for base stations, AMFs (Access and Mobility Management Function, access and mobility management functions), UPFs (User Plane Function, user plane functions), MMEs (Mobility Management Entity, mobility management entities), S-GWs (Serving Gateway) or UEs, etc. The various identifiers shown above are merely exemplary and are not intended to be limiting, and the present invention is not limited to the specific cells that are examples of such identifiers. Many variations and modifications may be made by one of ordinary skill in the art in light of the teachings of the illustrated embodiments. It will be appreciated by those skilled in the art that some or all of the mathematical expression or mathematical equation or mathematical inequality may be reduced or transformed or rewritten to some extent, for example combining constant terms, as well as exchanging two addition terms, as well as exchanging two multiplication terms, as well as moving one term from left to right of the equation or inequality after changing the sign, as well as moving one term from right to left of the equation or inequality after changing the sign, etc.; the mathematical expressions or mathematical equations or mathematical inequalities before and after simplification or transformation or rewriting may be regarded as equivalent.

It should be understood that the above-described embodiments of the present invention may be implemented by software, hardware, or a combination of both software and hardware. For example, the various components within the base station and user equipment in the above embodiments may be implemented by a variety of means including, but not limited to: analog circuit devices, digital Signal Processing (DSP) circuits, programmable processors, application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs), programmable logic devices (CPLDs), and the like.

In the present invention, a "base station" may refer to a mobile communication data and/or control switching center having a certain transmission power and a certain coverage area, and may include, for example, functions such as resource allocation scheduling, data reception and transmission. "user equipment" may refer to user mobile terminals including, for example, mobile phones, notebooks, etc., that may communicate wirelessly with a base station or micro base station.

Furthermore, embodiments of the invention disclosed herein may be implemented on a computer program product. More specifically, the computer program product is one of the following: has a computer readable medium encoded thereon with computer program logic that, when executed on a computing device, provides relevant operations to implement the above-described aspects of the invention. The computer program logic, when executed on at least one processor of a computing system, causes the processor to perform the operations (methods) described in embodiments of the invention. Such an arrangement of the present invention is typically provided as software, code and/or other data structures arranged or encoded on a computer readable medium, such as an optical medium (e.g., CD-ROM), floppy disk or hard disk, or other a medium such as firmware or microcode on one or more ROM or RAM or PROM chips, or as downloadable software images in one or more modules, shared databases, etc. The software or firmware or such configuration may be installed on a computing device to cause one or more processors in the computing device to perform the techniques described by embodiments of the present invention.

Furthermore, each functional module or each feature of the base station apparatus and the terminal apparatus used in each of the above embodiments may be implemented or performed by a circuit, which is typically one or more integrated circuits. Circuits designed to perform the functions described in this specification may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or a general purpose integrated circuit, a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The or each circuit may be configured by digital circuitry or may be configured by logic circuitry. In addition, when advanced technologies capable of replacing the current integrated circuits are presented due to advances in semiconductor technology, the present invention can also use integrated circuits obtained using the advanced technologies.

While the invention has been shown above in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that various modifications, substitutions and changes may be made thereto without departing from the spirit and scope of the invention. Accordingly, the invention should not be limited by the above-described embodiments, but by the following claims and their equivalents.

Claims

1. A method performed by a user equipment, UE, comprising:

determining reserved resources in a future time slot; the method comprises the steps of,

performing a channel access procedure for a SL transmission scheduled in the time slot before the start time of the time slot arrives; wherein,

and in the channel access flow, when power detection is executed, removing the power on the frequency resource corresponding to the reserved resource.

2. A user equipment, comprising:

a processor; and

a memory in which instructions are stored,

wherein the instructions, when executed by the processor, perform the method according to claim 1.