METHOD AND APPARATUS FOR SIDELINK RESOURCE RESELECTION - Patent application

Abstract

An embodiment of the present invention provides a method and apparatus for sidelink resource reselection, the method including the steps of: determining a first monitoring slot set for performing partial sensing for a first candidate slot set of a first transmission period, determining a second monitoring slot set for performing partial sensing for a second transmission period based on the first monitoring slot set of the first transmission period and the second candidate slot set of a second transmission period, monitoring sidelink control information in the second monitoring slot set of the second transmission period, and performing resource reselection in the second candidate slot set of the second transmission period based on a monitoring result.

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE The present invention relates to the field of communications technology. [Background technology]

[0002] Rel-15 and its previous versions of Vehicle to Everything (V2X) communication support two types of allocation methods of sidelink resources, namely, Mode 1 and Mode 2. In Mode 1, sidelink resources are allocated by a network device (e.g., a base station). In Mode 2, a terminal device autonomously selects transmission resources, i.e., the transmission resources are obtained through a sensing or detection resource selection process.

[0003] Meanwhile, New Radio (NR) V2X is one of the research projects in the standardization of Rel-16, and NR V2X needs to support more new scenarios and new services (e.g., remote driving, autonomous driving, fleet driving, etc.) than Long Term Evolution (LTE) V2X, and meet higher technical indicators (high reliability, low latency, high data rate, etc.).

[0004] In the Rel-17 sidelink enhancement agenda, one important goal is power saving for terminal devices (e.g., handheld user equipment (P-UE)). Partial sensing, as an efficient power saving mechanism, has been proposed as one of the resource selection mechanisms for power saving in Rel-17.

[0005] The above description of the background art is merely for the purpose of more clearly and completely explaining the configurations of the present invention and for the understanding of those skilled in the art, and should not be construed as meaning that these configurations are well known to those skilled in the art just because they are described in the background art of the present invention. Summary of the Invention [Problem to be solved by the invention]

[0006] According to the findings of the inventors of the present invention, in a terminal device supporting partial sensing based on a period, the power consumption may increase, which may result in unnecessary waste. Also, in a terminal device supporting partial sensing, resource re-evaluation / resource preemption detection may cause a shortage of candidate resources during resource reselection, which may increase possible interference or increase the probability of resource collision.

[0007] In view of at least one of the above problems, embodiments of the present invention provide a method and apparatus for sidelink resource reselection. [Means for solving the problem]

[0008] In one aspect of an embodiment of the present invention, a method for reselecting sidelink resources is provided, the method including the steps of: determining a first monitoring slot set for performing partial sensing for a first candidate slot set of a first transmission period by a terminal device; determining a second monitoring slot set for performing partial sensing for a second transmission period based on the first monitoring slot set of the first transmission period and a second candidate slot set of a second transmission period; monitoring sidelink control information in the second monitoring slot set of the second transmission period; and performing resource reselection in the second candidate slot set of the second transmission period based on a monitoring result.

[0009] In another aspect of an embodiment of the present invention, there is provided an apparatus for reselecting sidelink resources, the apparatus including: a determination unit that determines a first monitoring slot set for performing partial sensing for a first candidate slot set of a first transmission period, and determines a second monitoring slot set for performing partial sensing of a second transmission period based on the first monitoring slot set of the first transmission period and a second candidate slot set of a second transmission period; a monitoring unit that monitors sidelink control information in the second monitoring slot set of the second transmission period; and a reselection unit that performs resource reselection in the second candidate slot set of the second transmission period based on a monitoring result.

[0010] In another aspect of an embodiment of the present invention, there is provided a method for reselecting sidelink resources, comprising a step of a terminal device shifting first candidate slots of a first transmission period backward in the time domain by N current transmission periods to obtain a second set of candidate slots of a second transmission period, where N is the number of periods between the second transmission period and the first transmission period.

[0011] In another aspect of an embodiment of the present invention, there is provided an apparatus for reselecting sidelink resources, comprising: a decision unit for determining a second set of candidate slots for a second transmission period as a set of first candidate slots for a first transmission period after shifting them backward in time by N current transmission period, where N is the number of periods separating the second transmission period from the first transmission period.

[0012] In another aspect of an embodiment of the present invention, there is provided a method for reselecting sidelink resources, the method including the steps of: a terminal device determining, as a fourth candidate slot set for resource reselection, at least one slot after a third candidate slot set for resource initial selection; determining a fourth monitoring slot set for performing partial sensing for the third candidate slot set; determining a fifth monitoring slot set corresponding to the fourth candidate slot set for resource reselection based on the fourth monitoring slot set; monitoring sidelink control information in the fifth monitoring slot set; and performing resource reselection in the fourth candidate slot set for resource reselection based on a monitoring result.

[0013] In another aspect of an embodiment of the present invention, there is provided an apparatus for reselecting sidelink resources, the apparatus including: a determination unit that determines at least one slot after a third candidate slot set for resource initial selection as a fourth candidate slot set for resource reselection, determines a fourth monitoring slot set for performing partial sensing for the third candidate slot set, and determines a fifth monitoring slot set corresponding to the fourth candidate slot set for resource reselection based on the fourth monitoring slot set; a monitoring unit that monitors sidelink control information in the fifth monitoring slot set; and a reselection unit that performs resource reselection in the fourth candidate slot set for resource reselection based on a monitoring result.

[0014] One of the advantageous effects of the embodiment of the present invention is as follows: A second monitoring slot set for performing partial sensing of the second transmission period is determined based on the first monitoring slot set of the first transmission period and the second candidate slot set of the second transmission period, so that monitoring for resource reselection can be performed in some slots, unnecessary power consumption can be avoided, and the effect of power saving can be improved.

[0015] In addition, at least one slot following the candidate slot set for resource initial selection is set as a candidate slot set for resource reselection, which can increase the number of candidate resources during resource reselection, reduce possible interference, or reduce the probability of resource collision, thereby improving system performance.

[0016] As shown in the following description and drawings, specific embodiments of the present invention are disclosed in detail to show how the principles of the present invention can be employed. However, the scope of the embodiments of the present invention is not limited to these. The embodiments of the present invention include modifications, alterations, and equivalents within the spirit and scope of the appended claims.

[0017] Features described and / or illustrated in one embodiment may be used in the same or similar manner in one or more other embodiments and may be combined with or substituted for features in the other embodiments.

[0018] It should be noted that in this text, the term "including / having" means the presence of a feature, element, step or component, and does not exclude the presence or addition of one or more other features, elements, steps or components. [Brief description of the drawings]

[0019] Elements and features depicted in one drawing and one embodiment of the present invention may be combined with elements and features shown in one or more drawings or embodiments, and in the drawings, like reference numerals may designate corresponding elements in multiple drawings and may designate corresponding elements used in more than one embodiment. [Figure 1] 1 is a schematic diagram of a communication system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic diagram of an example of sidelink resource selection by a terminal device. [Diagram 3] FIG. 13 is a schematic diagram of an example of partial sensing by a terminal device. [Figure 4]FIG. 13 is a schematic diagram of another example of partial sensing by a terminal device. [Diagram 5] FIG. 2 is a schematic diagram of an example of a resource re-evaluation process. [Figure 6] FIG. 2 is a schematic diagram of an example of a resource preemption detection process. [Figure 7] FIG. 13 is a schematic diagram of an example of reselection of a periodic reservation resource. [Figure 8] FIG. 13 is a schematic diagram of an example of power consumption with partial sensing based on cycles. [Figure 9] 1 is a schematic diagram of an example of candidate resource shortage due to resource re-evaluation / resource preemption detection in partial sensing; [Figure 10] FIG. 2 is a schematic diagram of an example of a sidelink resource reselection method according to an embodiment of the present invention; [Figure 11] FIG. 11 is a schematic diagram of an example of determining a second monitoring slot set according to an embodiment of the present invention. [Figure 12] FIG. 11 is a schematic diagram of another example of determining a second monitoring slot set according to an embodiment of the present invention. [Figure 13] FIG. 11 is a schematic diagram of another example of determining a second monitoring slot set according to an embodiment of the present invention. [Figure 14] FIG. 11 is a schematic diagram of another example of determining a second monitoring slot set according to an embodiment of the present invention. [Figure 15] FIG. 2 is a schematic diagram of an example of a sidelink resource reselection method according to an embodiment of the present invention; [Figure 16] 11 is a schematic diagram of an example of determining a sixth monitoring slot set according to an embodiment of the present invention. FIG. [Figure 17] FIG. 11 is a schematic diagram of an example of determining a fifth monitoring slot set according to an embodiment of the present invention. [Figure 18] FIG. 11 is a schematic diagram of another example of determining a fifth monitoring slot set according to an embodiment of the present invention. [Figure 19] FIG. 2 is a schematic diagram of an example of a sidelink resource reselection device according to an embodiment of the present invention; [Figure 20] FIG. 2 is a schematic diagram of a network device according to an embodiment of the present invention. [Figure 21] FIG. 2 is a schematic diagram of a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The above and other features of the present invention will become apparent from the following description. In the specification and drawings, specific embodiments of the present invention are disclosed in detail, and some of the embodiments in which the principles of the present invention can be adopted are shown. However, the present invention is not limited to the described embodiments. The present invention includes all modifications, variations, and equivalents within the scope of the appended claims. Each embodiment of the present invention will be described below with reference to the drawings. These embodiments are merely illustrative and do not limit the present invention.

[0021] In embodiments of the present invention, the terms "first", "second", etc. are used in the title to distinguish different elements, but do not represent the spatial arrangement or temporal order of these elements, and these elements are not limited to these terms. The term "and / or" includes any and all combinations of one or more of the terms listed in the associated list. The terms "including", "comprising", "having", etc. refer to the presence of listed features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

[0022] In the embodiments of the present invention, the singular forms "a", "the", etc., include the plural forms and should be understood broadly as "one kind" or "a class", and are not limited to "one". In addition, the term "said" should be understood to include both the singular and the plural forms, unless the context clearly indicates otherwise. In addition, the term "described in" should be understood to mean "described at least in part", and the term "based on" should be understood to mean "based at least in part on", unless the context clearly indicates otherwise.

[0023] In an embodiment of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as, for example, Long Term Evolution (LTE), Advanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0024] Additionally, communications between devices in a communication system may occur according to any stage of communication protocols, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and 5G, New Radio (NR), and / or other currently known or future developed communication protocols.

[0025] In the embodiment of the present invention, the term "network device" refers to a device in a communication system, for example, allowing a terminal device to access the communication system and providing a service to the terminal device. The network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobility management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0026] Among them, the base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), and a 5G base station (gNB), etc., as well as a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low power node (e.g., femto, pico, etc.). Also, the term "base station" may include some or all of the functions thereof, and each base station may provide communication coverage for a particular geographic area. The term "cell" may refer to a base station and / or its coverage area depending on the context in which the term is used.

[0027] In the embodiment of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to an apparatus that accesses a communication network and receives a network service via, for example, a network device. The terminal apparatus may be fixed or mobile, and may be called a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, etc.

[0028] Among them, the terminal device may include, but is not limited to, a mobile phone, a personal digital assistant (PDA), a wireless modulation / demodulation device, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless phone, a smartphone, a smart watch, a digital camera, and the like.

[0029] For example, in a scenario such as the Internet of Things (IoT), the user equipment may be a monitoring or measuring device or equipment, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0030] Furthermore, the term "network side" or "network device side" refers to the side of a network, which may be a base station or may include one or more of the network devices mentioned above. The term "user side" or "terminal side" or "terminal device side" refers to the side of a user or terminal, which may be a UE or may include one or more of the terminal devices mentioned above. In this specification, unless otherwise specified, "device" may refer to a network device or may refer to a terminal device.

[0031] The following describes an embodiment scenario of the present invention with reference to an example, but the present invention is not limited thereto.

[0032] 1 is a schematic diagram of a communication system according to an embodiment of the present invention, and illustrates an example of a user device and a network device. As shown in FIG. 1, a communication system 100 may include a network device 101 and terminal devices 102 and 103. For convenience of explanation, FIG. 1 illustrates two terminal devices and one network device as an example, but the embodiment of the present invention is not limited thereto.

[0033] In the embodiment of the present invention, existing services or services that can be implemented in the future can be performed between the network device 101 and the terminal devices 102 and 103. For example, these services include, but are not limited to, enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra-Reliable and Low-Latency Communication (URLLC).

[0034] 1 shows that both of the two terminal devices 102 and 103 are located within the coverage area of ​​the network device 101, but the present invention is not limited to this. Both of the two terminal devices 102 and 103 may not be located within the coverage area of ​​the network device 101, or one of the terminal devices 102 may be located within the coverage area of ​​the network device 101 and the other terminal device 103 may be located outside the coverage area of ​​the network device 101.

[0035] In an embodiment of the present invention, sidelink transmission may be performed between two terminal devices 102 and 103. For example, the two terminal devices 102 and 103 may both perform sidelink transmission within the coverage area of ​​the network device 101 to realize V2X communication, or both perform sidelink transmission outside the coverage area of ​​the network device 101 to realize V2X communication, or one terminal device 102 may be located within the coverage area of ​​the network device 101 and the other terminal device 103 may be located outside the coverage area of ​​the network device 101 to realize V2X communication and perform sidelink transmission.

[0036] In an embodiment of the present invention, the terminal device 102 and / or 103 may autonomously select sidelink resources (i.e., may adopt Mode 2), in which case the sidelink transmission may be independent of the network device 101, i.e., the network device 101 may be optional. Note that in an embodiment of the present invention, the autonomous selection of sidelink resources (i.e., adopting Mode 2) and the allocation of sidelink resources by the network device (i.e., adopting Mode 1) may be combined, and the embodiment of the present invention is not limited thereto.

[0037] In V2X, a terminal device can obtain sidelink transmission resources through a process of sensing detection+resource selection, where sensing may be continuously performed to obtain the occupancy status of resources in a resource pool. For example, the terminal device may estimate the occupancy status of resources in a later certain period (referred to as a selection window) based on the occupancy status of resources in a previous certain period (referred to as a sensing window).

[0038] Fig. 2 is a schematic diagram of an example of sidelink resource selection by a terminal device. As shown in Fig. 2, the terminal device may obtain a resource occupancy status of a (n-1000)th to (n-1)th subframe or slot (i.e., sensing window) by detecting sidelink control information (SCI) in the (n-1000)th to (n-1)th subframe or slot and time-frequency resource reference signals at different positions, and estimate a resource occupancy status of a (n+T1)th to (n+T2)th subframe or slot (i.e., selection window).

[0039] For example, when there is sidelink data to be transmitted, the physical layer of the terminal device receives resource selection granularity R from an upper layer (e.g., a Media Access Control (MAC) layer). x,yThe granularity may represent a series of consecutive subchannels in one subframe, each subchannel including multiple consecutive physical resource blocks (PRBs), and the number of PRBs may be determined by a resource pool, which is configured or pre-configured by a network device (e.g., a base station). x,y Resources (hereinafter referred to as R x,y A set of resources (called candidate resources) is initially defined as Set A.

[0040] The terminal device may exclude some of the candidate resources in Set A (candidate resource set) based on the result of detection within the sensing window before the data to be transmitted arrives. For example, in Rel-16 NR V2X, x,y Candidate resources need to be eliminated.

[0041] Slot m SL SCI is detected in and the reservation period P indicated by the corresponding SCI format 1-A is rsvp_RX and the corresponding data priority prio RX Get the.

[0042] The measurement result of the demodulation reference signal (DMRS) of the physical sidelink control channel (PSCCH) corresponding to the detected SCI format 1-A or the reference signal receiving power (RSRP) of the DMRS (determined by the resource pool configuration) of the physical sidelink shared channel (PSSCH) is Th(prio RX ) is greater than Th(prio RX) is the corresponding higher layer parameter ThresRSRP_pi_pj, and p j is the current priority of the data to be transmitted by the UE indicated by the higher layer, and p i is the priority indicated in the SCI of the detected other UE.

[0043] The resources indicated by the corresponding SCI format 1-A and the resources of the next period that can be reserved (e.g., for a short period of less than 100 ms, this may include multiple resources), and the resources in the currently transmitted candidate set Set A (outside 1) It overlaps with TIFF0007673825000001.tif21153. j=0,1,…,C resel -1, where resources refer to the candidate resources of set A within the current selection window and resources at periodic positions that may be reserved by subsequent periods of the periodic service.

[0044] After the above resource exclusion, R remaining in Set A x,y If the number of candidate resources is less than X% (e.g., 20%) of the initial total number, the remaining R in Set A x,y The RSRP threshold is increased by 3 dB and the initial Set A is removed again until the number of candidate resources is equal to or greater than 20% of the initial total number.

[0045] R in Set A x,y Put the candidate resources into Set B, where Set B is initially an empty set.

[0046] The above process of the physical layer acquiring the resource candidate set may be referred to as step 1. Then, the physical layer of the terminal device may report Set B to the MAC layer. The following process of the MAC layer selecting resources from the resource candidate set may be referred to as step 2.

[0047] The MAC layer performs a random selection in Set B, selects a candidate resource to generate a grant for the current transmission, and selects a Modulation and Coding Scheme (MCS) for data transmission in the indicated resource.

[0048] If retransmission is configured in the MAC layer before resource selection, e.g., the number of transmissions is 2, the MAC layer selects one resource, then randomly selects another resource from the set of remaining available resources that are in the time domain range (e.g., [-15, 15]) indicated by the initial transmission SCI and do not include the subframe in which the selected resource is located, generates another grant, and selects one MCS from the indicated resources for data retransmission. The earlier of the two resources is used for the transmission of the initial transmission resource, and the later is used for the transmission of the retransmission resource. If there is no such available resource, the current transmission does not support retransmission, i.e., the number of transmissions is 1.

[0049] Note that the above is merely an example of the process of sensing detection and resource selection in V2X. For specific details of the above process, reference may be made to Section 14.1.1.6 of 3GPP (registered trademark) TS 36.213 V15.2.0.

[0050] In LTE V2X, a terminal device may support a resource selection mechanism for partial sensing.

[0051] FIG. 3 is a schematic diagram of an example of partial sensing by a terminal device. As shown in FIG. 3, Y subframes may be selected in a corresponding selection window, and a transmission resource may be selected from the candidate resources in the Y subframes. For example, Y must be equal to or greater than a parameter minNumCandidateSF configured by a higher layer. Accordingly, if the k-th bit is configured to 1 in a bitmap gapCandidateSensing configured by a higher layer, one subframe included in the set of selected Y-th subframes must monitor the subframe corresponding to the k-th bit in the sensing window. In simple terms, for some subframes monitored in the sensing window, only the subframes in the selection window corresponding to the k-th bit may be selected as a subframe in the set of Y subframes.

[0052] In NR V2X, it may be restricted that the candidate slots selected within the selection window must be slots monitored in the previous corresponding time domain positions. This can eliminate interference of periodic transmissions by other terminal devices in the same resource pool to the selected resources and ensure reliable performance of the system. This type of partial sensing may be defined as periodic-based partial sensing.

[0053] The transmitting terminal device performing the periodic partial sensing detects a physical sidelink control channel (PSCCH) in the monitoring slot corresponding to the selected candidate slot, i.e., obtains the resource occupancy status of other terminal devices, and transmits the corresponding first stage sidelink control information (1 st It is sufficient to detect stage SCI.

[0054] For example, one slot t y SLIf the selected slot is included in the candidate slots (Y slots), the terminal device (outside 2) TIFF0007673825000002.tif19153 needs to be monitored, k and P reserve The definition of may refer to the related art. reserve is a set of corresponding period values ​​(values ​​after being converted to logical slots) that need to be monitored for one candidate slot when the terminal device performs partial sensing based on a period, and may be the whole or a subset of the candidate period set configured by sl-ResourceReservePeriodList, and the parameter sl-ResourceReservePeriodList included in the resource pool configures the candidate period values ​​for periodic reservation allowed by the resource pool. k is the number of periods between a candidate slot and the corresponding monitoring slot that needs to be monitored. With regard to the selection of the k value, the closer to the time n at which the resource selection is performed or the closer to the first slot y0 of the Y candidate slots, the more reliable the sensing result obtained will be.

[0055] Also, (Outside 3) Periodic reservation SCI monitored in TIFF0007673825000003.tif20153 (the specified reservation period is P reserve ), the reference signal received power (RSRP) corresponding to the SCI is greater than a threshold, and the frequency domain resource indicated by the SCI is k P reserve If the resource R corresponds to a resource in a slot after the period, the candidate resources that overlap the resource R in the current transmission period or the subsequent transmission period are the corresponding slots t y SL must be excluded in

[0056] FIG. 4 is a schematic diagram of another example of partial sensing by a terminal device. As shown in FIG. reserve= {P1, P2, P3}. The terminal device receives each candidate slot P reserve For each period value in the figure, k is determined to be 1 to obtain the corresponding slot that needs to be monitored for the candidate slot.

[0057] Meanwhile, in Rel-16 NR V2X, after the UE selects one or more transmission resources in the candidate set corresponding to the current transmission block (TB) via the MAC layer (Step 2), it needs to further perform a resource re-evaluation process and / or a resource pre-emption detection process to determine the priority of sidelink transmission to decide whether to reselect the selected resource, mainly to eliminate interference caused by aperiodic or short-periodic services.

[0058] In the resource re-evaluation process, before each SCI is transmitted (defined as T3), the resources reserved by this SCI (not including the current transmission resource in the same slot as the PSCCH in which the SCI is located, but the subsequent resources reserved by the SCI, which have not yet been indicated or reserved by the SCI) need to be re-evaluated to determine whether the reserved resources overlap with resources occupied by other terminal devices after a predetermined time has elapsed and the measured RSRP value is greater than the corresponding threshold. The resource re-evaluation process is performed based on the physical layer obtaining a candidate resource set (Step 1). If a resource is no longer included in the resource candidate set reported by the resource re-evaluation process, the resource needs to be reselected.

[0059] Figure 5 is a schematic diagram of an example of a resource re-evaluation process. As shown in Figure 5, m1, m2 and m3 are three resources in multiple transmissions of one TB, and if m2 and m3 are reserved in the instruction of m1, at the time T3 before the transmission of m1, m1, m2 and m3 need to be re-evaluated, and if there is a resource (say m2) that is not in the candidate resource set after resource re-evaluation, a resource reselection of m2 is triggered.

[0060] In the resource preemption detection process, resource preemption detection is performed on the reserved resources according to the indication of the SCI, and it is determined whether the reserved resources overlap with the resources occupied by other terminal devices after a certain time has elapsed, and the measured RSRP value is greater than the corresponding threshold, and the priority indicated in the SCI corresponding to the resource occupied by the other terminal device is higher than the priority of the data to be currently transmitted. The resource preemption detection process is performed based on the physical layer obtaining a candidate resource set (Step 1). If a resource no longer exists in the resource candidate set reported by the resource preemption detection process, and the priority indicated in the SCI corresponding to the overlapping resource occupied by the other terminal device is higher than the priority of the data to be transmitted, the resource needs to be reselected.

[0061] Figure 6 is a schematic diagram of an example of a resource preemption detection process. As shown in Figure 6, m1, m2 and m3 are three resources in multiple transmissions of one TB, and m2 and m3 are reserved in the indication of m1. If the UE finds that the resource of m2 is preempted at some time after the transmission of m1 and before the transmission of m2, it may trigger resource reselection for m2 at or before the time T3 before m2.

[0062] In Rel-16 NR V2X, a sidelink transmission may not be transmitted or may need to be discarded by the terminal if the corresponding priority is low, including but not limited to (1) when the terminal device is transmitting an LTE V2X channel / signal and an NR V2X channel / signal and the time domain resources occupied by both transmissions overlap, (2) when the terminal device transmits / receives an LTE V2X channel / signal and transmits / receives an NR V2X channel / signal and the time domain resources occupied by both transmissions overlap, and (3) when the terminal device does not have the capability to simultaneously transmit both sidelink (SL) and uplink (UL) on the same serving cell and the time domain resources occupied by both transmissions overlap.

[0063] The above is an example of reselecting a selected resource within the same period. Rel-16 supports reselection of periodically reserved resources, and the causes of the reselection include, but are not limited to, the following: For periodically reserved resources, resource reselection may be triggered by resource reevaluation, resource preemption detection, and low priority transmission of sidelink.

[0064] 7 is a schematic diagram of an example of reselection of a periodic reservation resource. As shown in FIG. 7, for example, when a pre-emption occurs in a periodic reservation resource, a resource reselection is triggered in the current period, and a new resource is selected for the transmission of a new data packet in the current period.

[0065] According to the discovery of the inventors of the present invention, in a terminal device supporting periodic-based partial sensing, the first period needs to perform full periodic partial sensing to ensure the reliability of resource selection, but for subsequent periods, due to triggerable resource reselection, performing full periodic partial sensing to perform resource selection in the first transmission period may increase power consumption, and these increased power consumption may be wasted because the subsequent periods do not necessarily trigger resource reselection.

[0066] Fig. 8 is a schematic diagram of an example of power consumption due to partial sensing based on a period. As shown in Fig. 8, in subsequent periods (e.g., the second ... mth transmission period), resource reselection may not be triggered, but monitoring in all possible monitoring slots corresponding to candidate slots will still increase power consumption and cause unnecessary waste.

[0067] In addition, in the resource re-evaluation / resource preemption detection within one period, the terminal device needs to perform resource re-evaluation / resource preemption detection at a time point (m-T3) corresponding to one resource m. In a terminal device supporting partial sensing, when resource re-selection is triggered, the time domain resource covered by the selection window corresponding to the re-selection may be insufficient.

[0068] Figure 9 is a schematic diagram of an example of a shortage of candidate resources due to resource re-evaluation / resource preemption detection in partial sensing. As shown in Figure 9, when the reselection of resource m is triggered at time m-T3, the number of candidate time domain resources (denoted by 901) in the corresponding reselection window is less than the minimum value minNumCandidateSF of candidate time domain resources (Y slots) based on partial sensing, and the slots corresponding to the remaining resources in the reselection window are not monitored, so these remaining resources are not used for data transmission. This leads to fewer candidate resources for the reselected resource, which increases the probability of possible interference or resource collision, resulting in degraded system performance.

[0069] In order to address at least one of the above problems, the following further describes embodiments of the present invention.

[0070] In the embodiments of the present invention, the sidelink is described using V2X as an example, but the present invention is not limited thereto and can be applied to sidelink transmission scenarios other than V2X. In the following description, unless confusion occurs, the terms "sidelink" and "V2X" may be interchanged, the terms "PSFCH" and "sidelink feedback channel" may be interchanged, the terms "PSCCH" and "sidelink control channel" or "sidelink control information" may be interchanged, and the terms "PSSCH" and "sidelink data channel" or "sidelink data" may be interchanged.

[0071] Also, transmitting or receiving a PSCCH may be understood as transmitting or receiving sidelink data carried by the PSCCH. Transmitting or receiving a PSSCH may be understood as transmitting or receiving sidelink data carried by the PSSCH. Transmitting or receiving a PSFCH may be understood as transmitting or receiving sidelink feedback information carried by the PSFCH. Sidelink transmission may be understood as PSCCH / PSSCH transmission or transmission of sidelink data / information.

[0072] <Example 1> The embodiments of the present invention provide a sidelink resource selection method, which is described from the perspective of a terminal device supporting periodic partial sensing, where the terminal device can transmit sidelink data to other terminal devices, so the terminal device needs to perform resource selection to determine the transmission resources for the sidelink data.

[0073] 10 is a schematic diagram of an example of a method for reselecting sidelink resources according to an embodiment of the present invention. As shown in FIG. 10, the method includes the following steps:

[0074] Step 1001: The terminal device determines a first monitor slot set for performing partial sensing for a first candidate slot set in a first transmission period.

[0075] Step 1002: Determine a second monitoring slot set for performing partial sensing of the second transmission period based on the first monitoring slot set of the first transmission period and a second candidate slot set of a second transmission period.

[0076] Step 1003: Monitor the sidelink control information in the second monitoring slot set in the second transmission period.

[0077] Step 1004: Perform resource reselection in the second candidate slot set of the second transmission period based on a monitoring result.

[0078] It should be noted that the above FIG. 10 only shows a schematic example of the embodiment of the present invention, but the present invention is not limited thereto. For example, the execution order between various steps may be appropriately adjusted, some other steps may be added, and some steps may be removed. Those skilled in the art may make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 10.

[0079] In some aspects, the first transmission period is a first (first) sidelink data transmission period of the period-based partial sensing, and the second transmission period is a sidelink data transmission period other than the first sidelink data transmission period of the period-based partial sensing (e.g., a total of P N (i-th period, i is greater than 1 and P N (See below).

[0080] For example, the first transmission period is the first transmission period of the periodic transmission and the second transmission period is the second transmission period of the periodic transmission, and the interval (or offset) between them is one transmission period, or the first transmission period is the first transmission period of the periodic transmission and the second transmission period is the fourth transmission period of the periodic transmission, and the interval (or offset) between them is three transmission periods.

[0081] In some aspects, the first candidate slot set is one or more candidate slots (Y slots) in a selection window of the first transmission period, and the first monitoring slot set is one or more slots (Y slots) in a sensing window of the first transmission period, and the correspondence between the first candidate slot set and the first monitoring slot set may refer to the above description.

[0082] In some aspects, determining a second monitoring slot set for performing partial sensing of the second transmission period based on the first monitoring slot set of the first transmission period and the second candidate slot set of the second transmission period may include determining a third monitoring slot set corresponding to the second transmission period based on the second candidate slot set of the second transmission period in accordance with a rule for determining the first monitoring slot set in the first transmission period, and setting all or a portion of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period.

[0083] For example, a complete sensing pattern of period-based partial sensing may be determined for a reselected second candidate slot set (a subsequent periodic Y candidate slots different from the first candidate slot set of the initial selection period) according to a rule similar to that used for the initial resource selection, and the complete sensing pattern may be referred to as a third monitoring slot set.

[0084] Specifically, the slots included in the reselection candidate slot set for the current period (outside 4) For TIFF0007673825000004.tif18153, the corresponding slot is (outside 5) TIFF0007673825000005.tif19153, where j is the index of the current period, and P reserveis a set of corresponding periodicity values ​​(converted to logical slots) that the UE needs to monitor for one candidate slot when performing periodicity-based partial sensing, and may be a whole or a subset of the candidate periodicity set configured by the periodicity set parameter sl-ResourceReservePeriodList that enables periodicity reservation in the resource pool. k is the number of periods between the candidate slot and the corresponding slot, and k is an integer equal to or greater than 1. The value of k may be one or more, and a multiple k indicates that the corresponding monitoring times that monitoring is required are more than 1 for one periodicity that corresponds to one selected candidate slot. For each candidate slot, the UE calculates each P reserve , determine the corresponding one or more values ​​of k, respectively, to obtain the corresponding slots that need to be monitored for the candidate slot.

[0085] After determining the third monitoring slot set, all or some of the slots in the third monitoring slot set may be set as a second monitoring slot set for performing partial sensing of the second transmission period. For example, a subset is obtained from the complete sensing pattern (the third monitoring slot set) to determine a reduced sensing pattern (the second monitoring slot set).

[0086] In some aspects, selecting all or a portion of the slots in the third monitoring slot set as a second monitoring slot set for performing partial sensing of the second transmission period may include selecting one or more slots in the third monitoring slot set that are located after a reference time as the second monitoring slot set for performing partial sensing of the second transmission period.

[0087] For example, the reference time is A slot in which a sidelink transmission is located in the period immediately preceding the current transmission period; a slot preceding a sidelink transmission in a period immediately preceding the current transmission period, the slot being a slot at a processing time point preceding a sidelink transmission in the immediately preceding period, the processing time point being separated from the sidelink transmission by at least a processing time length (T3), e.g., the time point being (m-T3), where m is the slot of the sidelink transmission; or at least one of the slots before a sidelink transmission in a period immediately preceding the current transmission period, which slot is a slot between the processing time point before a sidelink transmission in the immediately preceding period and the slot in which the sidelink transmission is located in the immediately preceding period.

[0088] Fig. 11 is a schematic diagram of an example of determining a second monitoring slot set according to an embodiment of the present invention. As shown in Fig. 11, a first monitoring slot set (including slot sets indicated by 11011, 11012, and 11013) for performing partial sensing may be determined based on a first candidate slot set (indicated by 1101) for a first transmission period. A third monitoring slot set (including slot sets indicated by 11021, 11022, and 11023) corresponding to a second transmission period may be determined based on a second candidate slot set (indicated by 1102) for a second transmission period according to a rule for determining a first monitoring slot set in the first transmission period.

[0089] 11, slot set 11021 and slot set 11022 are located after the reference time (indicated by slot m), and therefore slot set 11021 and slot set 11022 are set as a second monitoring slot set (including the slot sets indicated by 11021 and 11022) for performing partial sensing of the second transmission cycle. On the other hand, slot set 11023 is located before the reference time (indicated by slot m), and therefore is not included in the second monitoring slot set.

[0090] 12 is a schematic diagram of another example of determining a second monitoring slot set according to an embodiment of the present invention. As shown in FIG. 12, a first monitoring slot set (including slot sets indicated by 12011, 12012, and 12013) for performing partial sensing may be determined based on a first candidate slot set (indicated by 1201) of a first transmission period. A third monitoring slot set (including slot sets indicated by 12021, 12022, and 12023) corresponding to a second transmission period may be determined based on a second candidate slot set (indicated by 1202) of a second transmission period according to the rule for determining the first monitoring slot set in the first transmission period.

[0091] 12, slot set 12021 is located after the reference time (indicated by slot m), and some slots (indicated by 1203) of slot set 12022 are located after the reference time (indicated by slot m), so slot set 12021 and slot set 1203 are set as a second monitoring slot set (including the slot sets indicated by 12021 and 1203) for performing partial sensing of the second transmission cycle. On the other hand, slot set 12023 is located before the reference time (indicated by slot m), so it is not included in the second monitoring slot set, and another part of slots (indicated by 1204) of slot set 12022 are also located before the reference time (indicated by slot m), so they are not included in the second monitoring slot set.

[0092] The above is an exemplary description of the reference time of the embodiment of the present invention, but the present invention is not limited thereto. By monitoring only a part of the corresponding slots corresponding to the second period, unnecessary power consumption can be avoided and the effect of power saving can be improved.

[0093] In some aspects, the step of selecting all or a portion of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period includes selecting one or more slots in the third monitoring slot set whose corresponding reservation period length is less than a period threshold as the second monitoring slot set for performing partial sensing of the second transmission period, for example, the period threshold includes, but is not limited to, 100 ms.

[0094] 13 is a schematic diagram of another example of determining a second monitoring slot set according to an embodiment of the present invention. As shown in FIG. 13, a first monitoring slot set (including slot sets indicated by 13011, 13012, and 13013) for performing partial sensing may be determined based on a first candidate slot set (indicated by 1301) for a first transmission period. A third monitoring slot set (including slot sets indicated by 13021, 13022, and 13023) corresponding to a second transmission period may be determined based on a second candidate slot set (indicated by 1302) for a second transmission period according to the rule for determining the first monitoring slot set in the first transmission period.

[0095] 13, the reservation period corresponding to slot set 13021 is P1, the length of which is smaller than the period threshold (e.g., 100 ms), the reservation period corresponding to slot set 13022 is P2, the length of which is equal to or greater than the period threshold (e.g., 100 ms), and the reservation period corresponding to slot set 13023 is P3, the length of which is equal to or greater than the period threshold (e.g., 100 ms). Therefore, slot set 13021 is set as a second monitoring slot set (including the slot set indicated by 13021) for performing partial sensing of the second transmission period, but slot sets 13022 and 13023 are not included in the second monitoring slot set.

[0096] This makes it possible to avoid unnecessary power consumption by performing monitoring only on some of the corresponding slots, thereby improving the effect of power saving.

[0097] In some aspects, selecting all or a portion of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period includes randomly selecting one or more slots from the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period.

[0098] 13 as an example, one or more slots may be randomly selected from slot sets 13021, 13022, and 13023, for example, slot set 13021 may be selected. The randomly selected slot set 13021 is set as a second monitoring slot set for performing partial sensing of the second transmission period.

[0099] This makes it possible to avoid unnecessary power consumption by performing monitoring only on some of the corresponding slots, thereby improving the effect of power saving.

[0100] In some aspects, one or more slots before and / or after triggering resource reselection, or one or more consecutive slots before and / or after the initial candidate slot, are the second monitoring slot set for partial sensing of the second transmission period.

[0101] 14 is a schematic diagram of another example of determining a second monitoring slot set according to an embodiment of the present invention. As shown in FIG. 14, a first monitoring slot set (including slot sets indicated by 14011, 14012, and 14013) for performing partial sensing may be determined based on a first candidate slot set (indicated by 1401) for a first transmission period. A third monitoring slot set (including slot sets indicated by 14021, 14022, and 14023) corresponding to a second transmission period may be determined based on a second candidate slot set (indicated by 1402) for a second transmission period according to the rule for determining the first monitoring slot set in the first transmission period.

[0102] As shown in Fig. 14, instead of monitoring the slot sets 14021, 14022 and 14023, monitoring may be performed in one or more consecutive slots (denoted by 1403) before the first candidate slot of the second candidate slot set (denoted by 1402). This may be referred to as contiguous partial sensing. This allows for the avoidance of interference to current transmissions due to non-periodic services.

[0103] Also, for example, if monitoring is performed in one or more consecutive slots after and / or before the resource reselection trigger time, the resource reselection does not need to determine the Y candidate slots, and the reselection window is not limited to within the Y candidate slots, or all resources within the reselection window may be candidate resources. After the consecutive monitoring time is over, the resource selection process is started.

[0104] This allows monitoring to be performed only during some consecutive slots, thereby avoiding unnecessary power consumption and improving the effect of power saving.

[0105] In some aspects, no monitoring of sidelink control information is performed on the second set of candidate slots for the second transmission period, and reselection resources for the second transmission period are selected randomly.

[0106] This can avoid unnecessary power consumption by not monitoring reselection resources, and improve the effect of power saving.

[0107] The monitoring slots for resource reselection have been described above as examples. In the following, candidate slots for resource reselection will be described.

[0108] In some aspects, the terminal device determines a second set of candidate slots for a second transmission period as a first set of candidate slots for a first transmission period after shifting the first set of candidate slots backward in the time domain by N current transmission periods, where N is the number of periods separating the second transmission period from the first transmission period.

[0109] For example, the Y candidate slots for the subsequent period may be restricted, i.e., they are obtained by shifting the initially selected Y candidate slots by the current transmission period. y SL If is included in the selected slot candidate set (Y slots), then for the subsequent period, slot (outside 6) TIFF0007673825000006.tif22153 (j=0,1,2...) is also included in the candidate slot set (Y slots) corresponding to the subsequent period, where j is the period index, j=0 represents the first period, j=1 represents the second transmission period, and P' rsvp_TX represents the number of slots into which the currently transmitted period value has been converted into logical slots.

[0110] As shown in the following formula (1), one period P rsvp Let's convert the unit from milliseconds to logical slots and get P' rsvp may be obtained.

[0111]

number

[0112] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0113] According to this embodiment, a second monitoring slot set for performing partial sensing of a second transmission period is determined based on a first monitoring slot set of a first transmission period and a second candidate slot set of a second transmission period, whereby monitoring for resource reselection can be performed in some slots, unnecessary power consumption can be avoided, and the effect of saving power can be improved.

[0114] <Example 2> The embodiment of the present invention provides a method for reselecting sidelink resources. Description of the same contents as those in the first embodiment will be omitted.

[0115] In some aspects, the terminal determines a second set of candidate slots for a second transmission period after shifting the first candidate slots for the first transmission period backward in the time domain by N current transmission periods, where N is the number of periods separating the second transmission period from the first transmission period.

[0116] In some aspects, the terminal determines a first monitor slot set for performing partial sensing for a first candidate slot set for a first transmission period.

[0117] In some aspects, the terminal device determines a second monitoring slot set for performing partial sensing for the second candidate slot set for the second transmission period, monitors sidelink control information in the second monitoring slot set for the second transmission period, and performs resource reselection in the second candidate slot set for the second transmission period based on a monitoring result.

[0118] In some aspects, the first transmission period is a first sidelink data transmission period of the partial sensing based on the period, and the second transmission period is one of the sidelink data transmission periods other than the first sidelink data transmission period of the partial sensing based on the period.

[0119] In some aspects, the set of candidate slots for reselection includes the corresponding slots in which the selected resource of the first transmission period is located, shifted backward by j periods P, where j is a period index and j=0, 1, 2, . . . , P is a transmission period. For example, y If t is a slot in which the selected resource of the first transmission period exists, y+j*P is included in the candidate slot set for reselection in the j+1th transmission period, where j is the period index and P is the transmission period.

[0120] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0121] <Example 3> The embodiment of the present invention provides a method for reselecting sidelink resources, which is described from the perspective of a terminal device supporting partial sensing, where the terminal device can transmit sidelink data to other terminal devices, so the terminal device needs to perform resource selection to determine the transmission resources for the sidelink data.

[0122] 15 is a schematic diagram of an example of a method for reselecting sidelink resources according to an embodiment of the present invention. As shown in FIG. 15, the method includes the following steps:

[0123] Step 1501: The terminal device selects at least one slot following the third candidate slot set for resource initial selection as a fourth candidate slot set for resource reselection.

[0124] Step 1502: Determine a fourth monitoring slot set for performing partial sensing for the third candidate slot set.

[0125] Step 1503: Determine a fifth monitoring slot set corresponding to the fourth candidate slot set for resource reselection based on the fourth monitoring slot set.

[0126] Step 1504: Monitor the sidelink control information in the fifth monitoring slot set.

[0127] Step 1505: Perform resource reselection in a fourth candidate slot set for the resource reselection based on the monitoring result.

[0128] It should be noted that the above FIG. 15 only shows a schematic example of the present invention, but the present invention is not limited thereto. For example, the execution order between various steps may be appropriately adjusted, some other steps may be added, and some steps may be removed. Those skilled in the art may make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 15.

[0129] In some aspects, the initial resource selection and the resource reselection are performed for one transmission period, but the present invention is not limited thereto. At least one consecutive slot after the initially selected candidate slot of the resource may be selected as a candidate slot for resource reselection. That is, the resource reselection in the period is not limited to the initially selected Y candidate slots, and the slot after the initially selected Y candidate slots may be additionally selected as a candidate slot for resource reselection. This can increase the number of candidate resources at the time of resource reselection.

[0130] In some aspects, the candidate slot for reselection is included in the slot set of the resource already selected in the current period that triggers the reselection. For example, yIf is the slot in which the preempted resource resides, then t y are also included in the set of candidate slots for reselection.

[0131] In some aspects, determining a fifth monitor slot set corresponding to a fourth candidate slot set for resource reselection based on the fourth monitor slot set includes determining a sixth monitor slot set corresponding to the fourth candidate slot set for resource reselection according to a rule for determining the fourth monitor slot set, and setting all or a portion of slots in the sixth monitor slot set as the fifth monitor slot set.

[0132] 16 is a schematic diagram of an example of determining a sixth monitoring slot set according to an embodiment of the present invention. As shown in FIG. 16, based on a third candidate slot set (denoted by 1601, including Y slots) for initial resource selection, a fourth monitoring slot set (denoted by 16011, including slot sets denoted by 16012, and including 16013) for performing partial sensing may be determined.

[0133] 16, one or more slots (denoted by 1602) after the third candidate slot set (denoted by 1601, including Y slots) may be selected as a fourth candidate slot set for resource reselection. According to the rule for determining the fourth monitoring slot set, a sixth monitoring slot set (denoted by 16021, including slot sets denoted by 16022, and 16023) corresponding to the fourth candidate slot set (denoted by 1602) may be determined.

[0134] After determining the sixth monitoring slot set, all or some of the slots in the sixth monitoring slot set may be set as the fifth monitoring slot set. For example, a subset is obtained from the complete sensing pattern (the sixth monitoring slot set) to determine a reduced sensing pattern (the fifth monitoring slot set).

[0135] In some aspects, setting all or a portion of the slots in the sixth monitoring slot set as the fifth monitoring slot set includes setting one or more slots in the sixth monitoring slot set that are located after a reference time as the fifth monitoring slot set.

[0136] For example, the reference time is the slot in which the sidelink transmission immediately precedes the current sidelink transmission for which reselection was triggered; a slot preceding the sidelink transmission preceding the current sidelink transmission for which reselection was triggered, in which a processing time point preceding the previous sidelink transmission is located and which is separated from the previous sidelink transmission by at least a processing time length (T3); or the slot before the sidelink transmission immediately preceding the current sidelink transmission for which reselection was triggered, which is a slot between the processing time before the previous sidelink transmission and the slot in which the previous sidelink transmission is located.

[0137] wherein the current sidelink transmission and the immediately preceding sidelink transmission are respectively a retransmission and an initial transmission of one and the same transmission block, or the current sidelink transmission and the immediately preceding sidelink transmission are respectively an (M+1)th retransmission and an (M)th retransmission of one and the same transmission block, where M is a positive integer.

[0138] In some aspects, associating all or a portion of the slots in the sixth monitoring slot set with the fifth monitoring slot set includes associating one or more slots in the sixth monitoring slot set with a corresponding reservation period length less than a period threshold with the fifth monitoring slot set, for example, the period threshold including 100 ms.

[0139] 17 is a schematic diagram of an example of determining a fifth monitoring slot set according to an embodiment of the present invention. As shown in FIG. 17, based on a third candidate slot set (denoted by 1701 and including Y slots) for initial resource selection, a fourth monitoring slot set (denoted by 17011, including slot sets denoted by 17012, and including 17013) for performing partial sensing may be determined.

[0140] 17, one or more slots (denoted by 1702) after the third candidate slot set (denoted by 1701, including Y slots) may be determined as a fourth candidate slot set for resource reselection. According to the rule for determining the fourth monitoring slot set, a sixth monitoring slot set (denoted by 17021, including slot sets 17022 and 17023) corresponding to the fourth candidate slot set (denoted by 1702) may be determined.

[0141] As shown in FIG. 17, the reservation periods corresponding to slot sets 17023 and 17022 are 100 ms or more, and the reservation period corresponding to slot set 17021 is less than 100 ms, so that slot set 17021 is determined as the fifth monitoring slot set.

[0142] This allows monitoring to be performed only in some slots, thereby further avoiding unnecessary power consumption and improving the effect of saving power.

[0143] In some aspects, selecting all or a portion of the slots in the sixth monitoring slot set as the fifth monitoring slot set includes randomly selecting one or more slots from the sixth monitoring slot set as the fifth monitoring slot set.

[0144] 17 as an example, one or more slots may be randomly selected from slot sets 17021, 17022, and 17023, for example, slot set 17023 may be selected. Thus, slot set 17023 is set as the fifth monitoring slot set.

[0145] This allows monitoring to be performed only in some slots, thereby further avoiding unnecessary power consumption and improving the effect of saving power.

[0146] In some aspects, the fifth monitor slot set may be one or more slots before and / or after the triggering of resource reselection, or one or more contiguous slots before and / or after the initial candidate slot.

[0147] 18 is a schematic diagram of another example of determining a fifth monitoring slot set according to an embodiment of the present invention. As shown in FIG. 18, based on a third candidate slot set (denoted by 1801, including Y slots) of slots for initial resource selection, a fourth monitoring slot set (denoted by 18011, including slot sets denoted by 18012, 18013, and 18014) for performing partial sensing may be determined.

[0148] 18, one or more slots (denoted by 1802) following the third candidate slot set (denoted by 1801, including Y slots) may be determined as a fourth candidate slot set for resource reselection. According to the rule for determining the fourth monitoring slot set, a sixth monitoring slot set (denoted by 18021, including slot sets 18022 and 18023) corresponding to the fourth candidate slot set (denoted by 1802) may be determined.

[0149] As shown in Figure 18, instead of monitoring the slot sets 18021, 18022 and 18023, monitoring may be performed in one or more contiguous slots (denoted by 1803) before the first candidate slot of the fourth candidate slot set (denoted by 1802). This may be referred to as contiguous partial sensing. This allows for the avoidance of interference to current transmissions due to non-periodic services.

[0150] Although Fig. 18 illustrates the fifth monitoring slot set by taking the consecutive slots after the Y candidate slots as an example, the present invention is not limited thereto. For example, consecutive slots before or after another time point may be monitored, and these consecutive slots may be the fifth monitoring slot set. Then, resource selection is performed within a slot window after monitoring, which may include the Y candidate slots or may include slots after the Y candidate slots.

[0151] Also, resource reselection does not need to determine Y candidate slots, and all resources within the reselection window may be candidate resources, for example, if monitoring is performed in one or more consecutive slots after and / or before the resource reselection trigger time, and the resource selection process starts after a certain period of consecutive monitoring time.

[0152] This allows monitoring to be performed only during some consecutive slots, further avoiding unnecessary power consumption and improving power saving effects.

[0153] In some aspects, no sidelink control information is monitored for the fourth candidate slot set and reselection resources corresponding to the fourth candidate slot set are selected randomly.

[0154] This can avoid unnecessary power consumption by not monitoring reselection resources, and improve the effect of power saving.

[0155] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0156] According to this embodiment, at least one slot following the candidate slot set for resource initial selection is selected as the candidate slot set for resource reselection, which can increase the number of candidate resources during resource reselection, reduce possible interference, or reduce the probability of resource collision, and improve system performance.

[0157] <Example 4> An embodiment of the present invention provides a device for reselecting sidelink resources. The device may be, for example, a terminal device, or one or more elements or components configured in the terminal device. Descriptions of contents similar to those in the first and second embodiments will be omitted.

[0158] 19 is a schematic diagram of an example of a sidelink resource reselection device according to an embodiment of the present invention. As shown in FIG. 19, the sidelink resource reselection device 1900 includes a determination unit 1901, a monitoring unit 1902, and a reselection unit 1903.

[0159] In some aspects, the determining unit 1901 determines a first monitoring slot set for performing partial sensing for a first candidate slot set of a first transmission period, and determines a second monitoring slot set for performing partial sensing of a second transmission period based on the first monitoring slot set of the first transmission period and a second candidate slot set of a second transmission period. The monitoring unit 1902 monitors sidelink control information in the second monitoring slot set of the second transmission period. The reselecting unit 1903 performs resource reselection in the second candidate slot set of the second transmission period based on a monitoring result.

[0160] In some aspects, the first transmission period is a first sidelink data transmission period of the partial sensing based on the period, and the second transmission period is one of the sidelink data transmission periods other than the first sidelink data transmission period of the partial sensing based on the period.

[0161] In some aspects, the determination unit 1901 determines a third monitoring slot set corresponding to the second transmission period based on a second candidate slot set for the second transmission period in accordance with a rule for determining the first monitoring slot set in the first transmission period, and sets all or some of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period.

[0162] In some aspects, the determination unit 1901 determines one or more slots located after a reference time in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period.

[0163] In some aspects, the reference time is at least one of: a slot in which a sidelink transmission is located in a period immediately preceding a current transmission period; a slot prior to a sidelink transmission in a period immediately preceding a current transmission period, which is a slot at a processing time point prior to a sidelink transmission in the immediately preceding period, which processing time point is separated from the sidelink transmission by at least a processing time length; or a slot prior to a sidelink transmission in a period immediately preceding a current transmission period, which is a slot between the processing time point prior to a sidelink transmission in the immediately preceding period and a slot in which a sidelink transmission is located in the immediately preceding period.

[0164] In some aspects, the determination unit 1901 determines one or more slots in the third monitoring slot set whose corresponding reservation period length is less than a period threshold as the second monitoring slot set for performing partial sensing of the second transmission period.

[0165] In some aspects, the determiner 1901 randomly selects one or more slots from the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period.

[0166] In some aspects, the decision unit 1901 determines one or more slots before and / or after the trigger of resource reselection, or one or more consecutive slots before and / or after the initial candidate slot, as the second monitoring slot set for performing partial sensing of the second transmission period.

[0167] In some aspects, the determination unit 1901 determines that the first candidate slot set for the first transmission period is the second candidate slot set for the second transmission period after shifting the first candidate slot set for the first transmission period backward in the time domain by N current transmission periods, where N is the number of periods between the second transmission period and the first transmission period.

[0168] In some aspects, the reselector 1903 does not monitor the second set of candidate slots for the second transmission period for sidelink control information, and the reselection resources for the second transmission period are selected randomly.

[0169] In some aspects, the determination unit 1901 determines a second set of candidate slots for a second transmission period after shifting the first candidate slots for the first transmission period backward in the time domain by N current transmission periods, where N is the number of periods between the second transmission period and the first transmission period.

[0170] In some aspects, the determination unit 1901 determines a first monitoring slot set for performing partial sensing for a first candidate slot set for a first transmission period, and determines a second monitoring slot set for performing partial sensing for the second candidate slot set for the second transmission period.

[0171] In some aspects, the monitoring unit 1902 monitors the sidelink control information in the second set of monitored slots for the second transmission period, and the reselection unit 1903 performs resource reselection in the second set of candidate slots for the second transmission period based on a monitoring result.

[0172] In some aspects, the first transmission period is a first sidelink data transmission period of the partial sensing based on the period, and the second transmission period is one of the sidelink data transmission periods other than the first sidelink data transmission period of the partial sensing based on the period.

[0173] In some aspects, the determining unit 1901 determines at least one slot after the third candidate slot set for resource initial selection as a fourth candidate slot set for resource reselection, determines a fourth monitoring slot set for performing partial sensing for the third candidate slot set, and determines a fifth monitoring slot set corresponding to the fourth candidate slot set for resource reselection based on the fourth monitoring slot set. The monitoring unit 1902 monitors sidelink control information in the fifth monitoring slot set. The reselecting unit 1903 performs resource reselection in the fourth candidate slot set for resource reselection based on a monitoring result.

[0174] In some aspects, the determination unit 1901 determines a sixth monitoring slot set corresponding to the fourth candidate slot set for resource reselection according to a rule for determining the fourth monitoring slot set, and sets all or a part of the slots in the sixth monitoring slot set as the fifth monitoring slot set.

[0175] In some aspects, the determination unit 1901 selects one or more slots in the sixth monitoring slot set that are located after a reference time as the fifth monitoring slot set, and / or selects one or more slots in the sixth monitoring slot set whose corresponding reservation period length is less than a period threshold as the fifth monitoring slot set, and / or randomly selects one or more slots from the sixth monitoring slot set as the fifth monitoring slot set.

[0176] In some aspects, the reference time is at least one of: a slot in which a sidelink transmission immediately preceding the current sidelink transmission for which reselection was triggered is located; a slot prior to a sidelink transmission immediately preceding the current sidelink transmission for which reselection was triggered is located, where a processing time point prior to the previous sidelink transmission is located and where the processing time point and the previous sidelink transmission are separated by at least a processing time length; or a slot prior to a sidelink transmission immediately preceding the current sidelink transmission for which reselection was triggered is located, where the processing time point and the previous sidelink transmission are located.

[0177] In some aspects, the current sidelink transmission and the immediately previous sidelink transmission are a retransmission and an initial transmission, respectively, of a same transmission block (TB), or the current sidelink transmission and the immediately previous sidelink transmission are an M+1th retransmission and an Mth retransmission, respectively, of a same transmission block (TB), where M is a positive integer.

[0178] In some aspects, the decision unit 1901 determines that the fifth monitoring slot set is one or more slots before and / or after the triggering of resource reselection, or one or more consecutive slots before and / or after the initial candidate slot.

[0179] In some aspects, the reselector 1903 does not monitor sidelink control information for the fourth candidate slot set, and the reselection resources corresponding to the fourth candidate slot set are selected randomly.

[0180] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0181] It should be noted that, although only components or modules related to the present invention are described above, the present invention is not limited thereto. The sidelink resource reselection device 1900 may further include other components or modules. For specific contents of these components or modules, reference may be made to the related art.

[0182] Furthermore, for convenience of explanation, Fig. 19 only exemplarily illustrates the connection relationships or signal directions between various components or modules, but it is clear to those skilled in the art that various related technologies such as bus connections can be used. The above-mentioned various components or modules may be implemented by hardware devices such as a processor, a memory, a transmitter, and a receiver, and the present invention is not limited thereto.

[0183] According to this embodiment, a second monitoring slot set for performing partial sensing of a second transmission period is determined based on a first monitoring slot set of a first transmission period and a second candidate slot set of a second transmission period, whereby monitoring for resource reselection can be performed in some slots, unnecessary power consumption can be avoided, and the effect of saving power can be improved.

[0184] In addition, at least one slot following the candidate slot set for resource initial selection is set as a candidate slot set for resource reselection, which can increase the number of candidate resources during resource reselection, reduce possible interference, or reduce the probability of resource collision, thereby improving system performance.

[0185] <Example 5> The embodiment of the present invention further provides a communication system, and may refer to FIG. 1. Description of the same contents as those in the first to fourth embodiments will be omitted.

[0186] In some embodiments, the communication system 100 may include at least a terminal device.

[0187] The terminal device determines a first monitor slot set for performing partial sensing for a first candidate slot set in a first transmission period, determines a second monitor slot set for performing partial sensing for a second transmission period based on the first monitor slot set for the first transmission period and a second candidate slot set for a second transmission period, monitors sidelink control information in the second monitor slot set for the second transmission period, and performs resource reselection in the second candidate slot set for the second transmission period based on a monitoring result.

[0188] In some embodiments, the communication system 100 may include at least a terminal device.

[0189] The terminal device shifts the first candidate slots of the first transmission period backward in the time domain by N current transmission periods to obtain a second candidate slot set of the second transmission period, where N is the number of periods between the second transmission period and the first transmission period.

[0190] In some embodiments, the communication system 100 may include at least a terminal device.

[0191] The terminal device determines at least one slot after a third candidate slot set for resource initial selection as a fourth candidate slot set for resource reselection, determines a fourth monitoring slot set for performing partial sensing for the third candidate slot set, determines a fifth monitoring slot set corresponding to the fourth candidate slot set for resource reselection based on the fourth monitoring slot set, monitors sidelink control information in the fifth monitoring slot set, and performs resource reselection in the fourth candidate slot set for resource reselection based on a monitoring result.

[0192] An embodiment of the present invention further provides a network device, which may be, for example, a base station, but the present invention is not limited thereto and may be other network devices.

[0193] Fig. 20 is a schematic diagram of a network device according to an embodiment of the present invention. As shown in Fig. 20, the network device 2000 may include a processor 2010 (e.g., a central processing unit (CPU)) and a memory 2020, which is connected to the processor 2010. The memory 2020 may store various data, and may further store an information processing program 2030, which is executed under the control of the processor 2010.

[0194] Also, as shown in Fig. 20, the network device 2000 may further include a transceiver 2040 and an antenna 2050. The functions of the above members are similar to those of the prior art, and the description thereof will be omitted here. It is not necessary for the network device 2000 to include all the units shown in Fig. 20. Also, the network device 2000 may further include units not shown in Fig. 20, and may refer to the prior art.

[0195] The embodiment of the present invention further provides a terminal device, but the present invention is not limited thereto and may be other devices.

[0196] Fig. 21 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in Fig. 21, the terminal device 2100 may include a processor 2110 and a memory 2120, where the memory 2120 stores data and programs and is connected to the processor 2110. It should be noted that this diagram is exemplary, and other types of structures may be used to supplement or replace this structure to realize communication functions or other functions.

[0197] For example, the processor 2110 may execute a program to realize the sidelink resource reselection method described in Example 1. For example, the processor 2110 may be configured to execute the steps of: determining a first monitor slot set for performing partial sensing for a first candidate slot set of a first transmission period; determining a second monitor slot set for performing partial sensing of the second transmission period based on the first monitor slot set of the first transmission period and a second candidate slot set of a second transmission period; monitoring sidelink control information in the second monitor slot set of the second transmission period; and performing resource reselection in the second candidate slot set of the second transmission period based on a monitoring result.

[0198] For example, the processor 2110 may execute a program to realize the sidelink resource reselection method according to Example 2. For example, the processor 2110 may be configured to execute the steps of: shifting first candidate slots of a first transmission period backward in the time domain by N current transmission period to become a second set of candidate slots of a second transmission period, where N is the number of periods separating the second transmission period from the first transmission period.

[0199] For example, the processor 2110 may execute a program to realize the sidelink resource reselection method according to the third embodiment. For example, the processor 2110 may be configured to execute the steps of: determining at least one slot after a third candidate slot set for resource initial selection as a fourth candidate slot set for resource reselection; determining a fourth monitoring slot set for performing partial sensing for the third candidate slot set; determining a fifth monitoring slot set corresponding to the fourth candidate slot set for resource reselection based on the fourth monitoring slot set; monitoring sidelink control information in the fifth monitoring slot set; and performing resource reselection in the fourth candidate slot set for resource reselection based on a monitoring result.

[0200] 21, the terminal device 2100 may further include a communication module 2130, an input unit 2140, a display 2150, a power supply 2160, and the like. Here, the functions of the above units are similar to those of the conventional technology, and the description thereof will be omitted here. It is not necessary for the terminal device 2100 to include all the units shown in FIG. 21. The terminal device 2100 may further include units not shown in FIG. 21, and may refer to the conventional technology.

[0201] In an embodiment of the present invention, there is further provided a computer-readable program, which, when executed in a terminal device, causes the terminal device to execute the sidelink resource reselection method described in embodiments 1 to 3.

[0202] An embodiment of the present invention further provides a storage medium having a computer-readable program stored therein, the computer-readable program causing a terminal device to execute the sidelink resource reselection method described in embodiments 1 to 3 when the program is executed.

[0203] The above-mentioned apparatus and method of the present invention may be realized by hardware or by a combination of hardware and software.The present invention relates to a computer readable program which, when executed by a logic unit, causes the logic unit to realize the above-mentioned apparatus or components, or to realize the above-mentioned various methods or steps.The present invention relates to a storage medium for storing the above-mentioned program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0204] Each processing method in each device described with reference to the embodiments of the present invention may be implemented by hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in the drawings, or one or more combinations of the functional block diagrams, may correspond to each software module in a computer program flow, or each hardware module. These software modules may correspond to each step shown in the drawings. These hardware modules may be realized by implementing these software modules in hardware, for example, using a field programmable gate array (FPGA).

[0205] The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known to those skilled in the art. The storage medium may be connected to the processor so that the processor reads information from the storage medium or writes information to the storage medium, or the storage medium may be a component of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal, or in a memory card inserted in the mobile terminal. For example, if the device (e.g., a mobile terminal) uses a MEGA-SIM card or a large capacity flash memory device with a relatively large capacity, the software module may be stored in the MEGA-SIM card or the large capacity flash memory device.

[0206] One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams illustrated in the drawings may be implemented with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any suitable combination thereof to perform the functions described herein. One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams illustrated in the drawings may be implemented with, for example, a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors in combination with a DSP communication, or any other configuration.

[0207] Although the present invention has been described above with reference to specific embodiments, the above description is merely illustrative and does not limit the scope of protection of the present invention. Various modifications and changes may be made to the present invention without departing from the spirit and principles of the present invention, and these modifications and changes are also within the scope of the present invention.

[0208] Furthermore, the following supplementary notes are disclosed regarding the embodiments including the above-mentioned examples. (Appendix 1) A method for sidelink resource reselection, comprising: determining a first monitor slot set for performing partial sensing for a first candidate slot set of a first transmission period by the terminal device; determining a second monitoring slot set for performing partial sensing of the second transmission period based on the first monitoring slot set of the first transmission period and a second candidate slot set of a second transmission period; monitoring the sidelink control information in the second monitoring slot set of the second transmission period; and performing resource reselection in the second set of candidate slots for the second transmission period based on a monitoring result. (Appendix 2) 2. The method of claim 1, wherein the first transmission period is a first sidelink data transmission period of partial sensing based on a period, and the second transmission period is one of sidelink data transmission periods other than the first sidelink data transmission period of partial sensing based on the period. (Appendix 3) The step of determining a second monitoring slot set for performing partial sensing of the second transmission period based on the first monitoring slot set of the first transmission period and a second candidate slot set of the second transmission period includes: determining a third monitoring slot set corresponding to the second transmission period based on a second candidate slot set of the second transmission period according to a rule for determining the first monitoring slot set in the first transmission period; A method as described in claim 1 or 2, comprising a step of setting all or some of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period. (Appendix 4) The step of setting all or a part of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission cycle includes: The method described in Appendix 3, comprising a step of setting one or more slots located after a reference time in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period. (Appendix 5) The reference time is A slot in which a sidelink transmission is located in the period immediately preceding the current transmission period; a slot preceding a sidelink transmission in a period immediately preceding the current transmission period, the slot being a slot at a processing time point preceding a sidelink transmission in the immediately preceding period, the processing time point being separated from the sidelink transmission by at least a processing time length (T3); or 5. The method of claim 4, wherein the at least one slot is a slot before a sidelink transmission in a period immediately preceding a current transmission period, the slot being between the processing time point before a sidelink transmission in the immediately preceding period and a slot in which a sidelink transmission is located in the immediately preceding period. (Appendix 6) The step of setting all or a part of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission cycle includes: A method as described in any of Additions 3 to 5, comprising a step of selecting one or more slots in the third monitoring slot set whose corresponding reservation period length is shorter than a period threshold as the second monitoring slot set for performing partial sensing of the second transmission period. (Appendix 7) 7. The method of claim 6, wherein the period threshold comprises 100 ms. (Appendix 8) The step of setting all or a part of the slots in the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission cycle includes: A method as described in any of Additions 3 to 7, comprising a step of randomly selecting one or more slots from the third monitoring slot set as the second monitoring slot set for performing partial sensing of the second transmission period. (Appendix 9) The method of any of claims 1 to 8, further comprising a step of selecting one or more slots before and / or after a resource reselection trigger, or one or more consecutive slots before and / or after an initial candidate slot, as the second monitoring slot set for partial sensing of the second transmission period. (Appendix 10) 10. The method of claim 1, further comprising: shifting the first candidate slot set for the first transmission period backward in the time domain by N current transmission periods to become the second candidate slot set for the second transmission period, where N is the number of periods separating the second transmission period from the first transmission period. (Appendix 11) 11. The method of claim 1, further comprising not monitoring sidelink control information for the second set of candidate slots for the second transmission period and wherein reselection resources for the second transmission period are selected randomly. (Appendix 12) A method for sidelink resource reselection, comprising: A method comprising: a step in which a terminal device shifts first candidate slots of a first transmission period backward in the time domain by N current transmission periods to obtain a second candidate slot set of a second transmission period, where N is the number of periods between the second transmission period and the first transmission period. (Appendix 13) The method of claim 12, further comprising a step of the terminal device determining a first monitor slot set for performing partial sensing for a first candidate slot set in a first transmission period. (Appendix 14) determining a second monitoring slot set for the terminal device to perform partial sensing for the second candidate slot set of the second transmission period; monitoring the sidelink control information in the second monitoring slot set of the second transmission period; 14. The method of claim 12 or 13, further comprising: performing resource reselection in the second set of candidate slots for the second transmission period based on a monitoring result. (Appendix 15) 15. The method of claim 12, wherein the first transmission period is a first sidelink data transmission period of partial sensing based on a period, and the second transmission period is one of sidelink data transmission periods other than the first sidelink data transmission period of partial sensing based on the period. (Appendix 16) A method for sidelink resource reselection, comprising: A step of the terminal device selecting at least one slot after the third candidate slot set for resource initial selection as a fourth candidate slot set for resource reselection; determining a fourth monitoring slot set for performing partial sensing for the third candidate slot set; determining a fifth monitoring slot set corresponding to a fourth candidate slot set for resource reselection based on the fourth monitoring slot set; monitoring the fifth monitoring slot set for sidelink control information; and performing resource reselection in the fourth set of candidate slots for resource reselection based on a monitoring result. (Appendix 17) determining a fifth monitoring slot set corresponding to a fourth candidate slot set for resource reselection based on the fourth monitoring slot set, determining a sixth monitoring slot set corresponding to the fourth candidate slot set for resource reselection according to a rule for determining the fourth monitoring slot set; and selecting all or a portion of the slots in the sixth monitoring slot set as the fifth monitoring slot set. (Appendix 18) The step of setting all or a part of the slots in the sixth monitoring slot set as the fifth monitoring slot set includes: 18. The method of claim 17, further comprising a step of selecting one or more slots located after a reference time in the sixth monitoring slot set as the fifth monitoring slot set. (Appendix 19) The reference time is the slot in which the sidelink transmission immediately precedes the current sidelink transmission for which reselection was triggered; a slot preceding a sidelink transmission immediately preceding the current sidelink transmission for which a reselection was triggered, the slot being the slot in which a processing time instant preceding the previous sidelink transmission is located, the processing time instant being separated from the previous sidelink transmission by at least a processing time length (T3); or 19. The method according to claim 18, wherein the at least one slot is a slot before a sidelink transmission that immediately precedes a current sidelink transmission for which a reselection was triggered, the slot being a slot between the processing time point before the immediately preceding sidelink transmission and the slot in which the immediately preceding sidelink transmission is located. (Appendix 20) the current sidelink transmission and the immediately preceding sidelink transmission are a retransmission and an initial transmission, respectively, of a same transmission block (TB); or 20. The method of claim 19, wherein the current sidelink transmission and the previous sidelink transmission are, respectively, an M+1-th retransmission and an M-th retransmission of a same transport block (TB), where M is a positive integer. (Appendix 21) The step of setting all or a part of the slots in the sixth monitoring slot set as the fifth monitoring slot set includes: A method as described in any of Additions 17 to 20, comprising a step of selecting one or more slots in the sixth monitoring slot set whose corresponding reservation period length is less than a period threshold as the fifth monitoring slot set. (Appendix 22) 22. The method of claim 21, wherein the period threshold comprises 100 ms. (Appendix 23) The step of setting all or a part of the slots in the sixth monitoring slot set as the fifth monitoring slot set includes: 23. The method of any of claims 17 to 22, further comprising randomly selecting one or more slots from the sixth monitoring slot set as the fifth monitoring slot set. (Appendix 24) 24. The method of any of claims 16 to 23, further comprising the step of: selecting one or more slots before and / or after triggering resource reselection, or one or more consecutive slots before and / or after the initial candidate slot, as the fifth monitoring slot set. (Appendix 25) 25. The method of any of claims 16-24, further comprising not monitoring sidelink control information for the fourth candidate slot set and randomly selecting reselection resources corresponding to the fourth candidate slot set. (Appendix 26) 26. A terminal device comprising: a memory in which a computer program is stored; and a processor, the processor being configured to execute the computer program to realize the method for reselecting sidelink resources according to any one of Supplementary Notes 1 to 25. (Appendix 27) A communication system including a terminal device, a first monitoring slot set for performing partial sensing for a first candidate slot set in a first transmission period, a second monitoring slot set for performing partial sensing for a second transmission period based on the first monitoring slot set in the first transmission period and a second candidate slot set in a second transmission period, monitoring sidelink control information in the second monitoring slot set in the second transmission period, and performing resource reselection in the second candidate slot set in the second transmission period based on a monitoring result. (Appendix 28) A communication system including a terminal device, The terminal device shifts first candidate slots of a first transmission period backward in the time domain by N current transmission periods to obtain a second candidate slot set of a second transmission period, where N is the number of periods between the second transmission period and the first transmission period. (Appendix 29) A communication system including a terminal device, the terminal device determines at least one slot after a third candidate slot set for resource initial selection as a fourth candidate slot set for resource reselection, determines a fourth monitoring slot set for performing partial sensing for the third candidate slot set, determines a fifth monitoring slot set corresponding to the fourth candidate slot set for resource reselection based on the fourth monitoring slot set, monitors sidelink control information in the fifth monitoring slot set, and performs resource reselection in the fourth candidate slot set for resource reselection based on a monitoring result.

Claims

1. An apparatus for reselecting sidelink resources, comprising: Memory, a processor coupled to the memory, The processor is configured to set one or more candidate slots as a second set of candidate slots for a second transmission period, the one or more candidate slots being obtained based on one or more first candidate slots of a first transmission period for initial resource selection or reselection and N transmission periods, where N is a number of periods separating the second transmission period and the first transmission period.

2. The processor, determining a first monitoring slot set for performing partial sensing for a first candidate slot set of the first transmission period; The apparatus of claim 1 , configured to determine a second monitor slot set for performing partial sensing for the second candidate slot set of the second transmission period.

3. a monitoring unit configured to monitor sidelink control information in the second monitoring slot set of the second transmission period, The apparatus of claim 2 , wherein the processor performs resource reselection in the second set of candidate slots for the second transmission period based on a monitoring result.

4. 2. The apparatus of claim 1, wherein the first transmission period is a first sidelink data transmission period of partial sensing based on a period, and the second transmission period is one of sidelink data transmission periods other than a first sidelink data transmission period of partial sensing based on the period.

5. A method for reselecting sidelink resources, comprising: determining one or more candidate slots as a second set of candidate slots for a second transmission period, the one or more candidate slots being obtained based on one or more first candidate slots of a first transmission period for initial resource selection or reselection and N transmission periods, where N is a number of periods between the second transmission period and the first transmission period.

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