Re-selection method and apparatus of side link resource

Abstract

To provide an apparatus and a method to determine a side link resource set that is currently re-selected, on the basis of a time frequency resource which is initially selected.SOLUTION: In a mobile communication system, a re-selection method of a side link resource comprises the steps of: performing resource re-evaluation and / or preemption detection for a side link resource that is initially selected for performing transmission of a plurality of times of a transmission block; and re-selecting at least one side link resource from a side link resource set and determining a currently re-selected side link resource set on the basis of a time frequency resource of the initially selected side link resource when there is not one or more side link resources in a re-selected candidate resource set.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] In Rel-15 and its previous versions of vehicle-to-everything (V2X), two allocation methods of sidelink resources are supported: Mode 1 and Mode 2. In Mode 1, sidelink resources are allocated and acquired 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 acquired through a sensing or detection-resource selection process.

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

[0004] 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]

[0005] According to the discovery of the inventors of the present invention, compared with LTE V2X, NR V2X needs to support more retransmissions, i.e., the number of retransmissions may be greater than 1, and the total number of transmissions (initial transmission and retransmissions) may be greater than 2 (e.g., may be configured to be up to 32). Also, compared with LTE V2X, NR V2X needs to additionally support transmission and reception of aperiodic services, which may cause resource reselection. There is currently no solution for how to reselect sidelink resources from the candidate resource set in the selection window after the sidelink resources are selected.

[0006] 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]

[0007] In one aspect of an embodiment of the present invention, there is provided a sidelink resource reselection method comprising the steps of: performing resource re-evaluation and / or preemption detection for initially selected sidelink resources for multiple transmissions of a transport block; and reselecting at least one sidelink resource from a sidelink resource set if one or more sidelink resources are not in a reselection candidate resource set, and determining a currently reselected sidelink resource set based on a time-frequency resource of the initially selected sidelink resources.

[0008] In another aspect of an embodiment of the present invention there is provided an apparatus for sidelink resource reselection, comprising: a processing unit for performing resource re-evaluation and / or preemption detection for initially selected sidelink resources for multiple transmissions of a transport block; and a reselection unit for reselecting at least one sidelink resource from a sidelink resource set if one or more sidelink resources are not in a reselection candidate resource set, and for determining a currently reselected sidelink resource set based on time-frequency resources of the initially selected sidelink resources.

[0009] One of the advantageous effects of the embodiment of the present invention is as follows: reselect at least one sidelink resource from the sidelink resource set if one or more sidelink resources are not in the reselection candidate resource set, and determine the currently reselected sidelink resource set based on the time-frequency resources of the initially selected sidelink resource, thereby supporting more retransmissions and ensuring that the reselected resources transmitted multiple times are indicated and reserved by the sidelink control information.

[0010] As shown in the following description and drawings, certain embodiments of the present invention are disclosed in detail to show the manner in which 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.

[0011] 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 other embodiments.

[0012] It should be noted that in this text, the term "including" 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]

[0013] 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 sidelink resource selection by a terminal device in an embodiment of the present invention. [Diagram 3] FIG. 1 is a diagram of an example of a sidelink resource reselection method according to an embodiment of the present invention. [Figure 4] FIG. 1 is a schematic diagram of selecting sidelink resources one by one in an embodiment of the present invention; [Diagram 5] FIG. 2 is a diagram of an example of resource re-evaluation in an embodiment of the present invention. [Figure 6] FIG. 2 is a diagram of an example of preemption detection in accordance with an embodiment of the present invention. [Figure 7] FIG. 1 illustrates an example of sidelink resource reselection in case of resource re-evaluation in accordance with an embodiment of the present invention. [Figure 8] FIG. 13 is another example diagram of sidelink resource reselection in case of resource re-evaluation in accordance with an embodiment of the present invention. [Figure 9] FIG. 13 is another example diagram of sidelink resource reselection in case of resource re-evaluation in accordance with an embodiment of the present invention. [Figure 10] FIG. 13 is another example diagram of sidelink resource reselection in case of resource re-evaluation in accordance with an embodiment of the present invention. [Figure 11]FIG. 13 is another example diagram of sidelink resource reselection in case of resource re-evaluation in accordance with an embodiment of the present invention. [Figure 12] FIG. 1 illustrates an example of sidelink resource reselection in case of preemption detection in an embodiment of the present invention. [Figure 13] FIG. 13 is a diagram of another example of sidelink resource reselection in case of preemption detection in an embodiment of the present invention. [Figure 14] FIG. 1 is a schematic diagram of a sidelink resource reselection device according to an embodiment of the present invention; [Figure 15] FIG. 2 is a schematic diagram of a network device according to an embodiment of the present invention. [Figure 16] FIG. 2 is a schematic diagram of a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] The following describes an embodiment scenario of the present invention with reference to an example, but the present invention is not limited thereto.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In LTE 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).

[0032] Fig. 2 is a schematic diagram of a 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., a 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., a selection window).

[0033] 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,y The 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 (hereafter referred to as R x,y A set of resources (called candidate resources) is initially defined as Set A.

[0034] The terminal device may exclude some of the candidate resources in Set A based on the result of detection within the sensing window before the data to be transmitted arrives. For example, x,y Candidate resources need to be eliminated.

[0035] All R in subframes for which resources may be reserved by the terminal device in the selection window corresponding to the transmission subframe in the sensing window x,y Candidate Resources A specific R in a subframe that the terminal device detects within the sensing window x,y Candidate resource, where R x,y It is detected that the SCI reserves the corresponding subframe in the current selection window in the candidate resource, and the indicated frequency domain resource and this R x,y The candidate resource overlaps with the SCI in the frequency domain, and the detection result of the Reference Signal Receiving Power (RSRP) of the Physical Sidelink Shared Channel (PSSCH) corresponding to the SCI is greater than a threshold (hereinafter referred to as the RSRP threshold). Or, the SCI reserves a subframe after the selection window, and the subframe and one of the subframes that may be reserved in the current selection window are the same subframe in the time domain, and the frequency domain resource and the R x,y The candidate resource overlaps with the SCI in the frequency domain, and the detection result of the RSRP of the PSSCH corresponding to the SCI is greater than the RSRP threshold.

[0036] After the above resource exclusion, R remaining in Set A x,y If the number of candidate resources is less than 20% of the initial total number, R remaining 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.

[0037] R in Set Bx,y The number of candidate resources in Set A is R x,y R in Set A until it is greater than or equal to 20% of the initial total number of candidate resources. x,y The candidate resources in are put into Set B in ascending order of S-RSSI. Here, Set B is initially an empty set, and the S-RSSI is R x,y It represents the linear average of the signal strength of all subchannels in the candidate resource.

[0038] Then, the physical layer of the terminal device may report Set B to the MAC layer, and the MAC layer randomly selects from Set B to select candidate resources for data transmission, and also selects a modulation and coding scheme (MCS) from the indicated resources to transmit data.

[0039] If retransmission is configured in the MAC layer before resource selection, after selecting a resource, the MAC layer randomly selects one resource from the remaining available resources and included in the time domain range (e.g., [-15, 15] subframes) indicated by the initial transmission SCI, and selects one MCS from the indicated resources to perform 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.

[0040] Note that the above is merely an example of the sensing detection and resource selection process in LTE 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.

[0041] Also, compared to LTE V2X, NR V2X needs to support more retransmissions, i.e., the number of retransmissions may be greater than 1, and the total number of transmissions may be greater than 2 (e.g., may be configured to be up to 32). Also, the SCI corresponding to each sidelink resource can indicate only up to three transmission resources.

[0042] Also, compared with LTE V2X, NR V2X needs to additionally support the transmission and reception of non-periodic services. For example, after selecting a transmission resource, the UE needs to continue to detect whether there are other UEs occupying the resource selected for data transmission, or whether there are overlapping resources in the time-frequency domain for data transmission (mainly non-periodic services). There is no relevant conclusion in the current scheme about how to reselect resources in such cases. The following embodiments of the present invention provide corresponding solutions to one or more of the above problems.

[0043] 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 may be applied to sidelink transmission scenarios other than V2X. Also, sidelink control information (SCI) is carried via a PSCCH, sidelink data is carried via a PSSCH, and sidelink feedback information is carried via a physical sidelink feedback channel (PSFCH).

[0044] In the following description, unless confusion arises, 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.

[0045] Also, transmitting or receiving a PSSCH may be understood as transmitting or receiving sidelink data carried via the PSSCH. Transmitting or receiving a PSFCH may be understood as transmitting or receiving sidelink feedback information carried via the PSFCH. At least one transmission may be understood as at least one PSSCH / PSCCH transmission or at least one transmission of sidelink data / information. A current transmission may be understood as a current PSSCH / PSCCH transmission or a current sidelink data / information transmission.

[0046] In the embodiment of the present invention, the initial selection is related to the reselection and should not be understood as a specific selection. For example, the first selection may be referred to as the initial selection and the second selection may be referred to as the reselection, or the nth selection may be referred to as the initial selection and the n+1th selection may be referred to as the reselection, and the embodiment of the present invention is not limited thereto.

[0047] <Example 1> An embodiment of the present invention provides a method for reselecting sidelink resources, which is described from the terminal device side, where the terminal device (which may be referred to as a transmitting terminal device) serves as a service data transmitter and transmits sidelink data to one or more other terminal devices (which may be referred to as receiving terminal devices).

[0048] 3 is a diagram of an example of a method for reselecting sidelink resources in an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:

[0049] Step 301: Perform resource re-evaluation and / or preemption detection on initially selected sidelink resources for multiple transmissions of a transport block.

[0050] Step 302: Reselect at least one sidelink resource from a sidelink resource set if one or more sidelink resources are not in the reselection candidate resource set, where a currently reselected sidelink resource set is determined based on the time-frequency resources of the initially selected sidelink resources.

[0051] It should be noted that the above FIG. 3 only shows a schematic diagram of an 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. 3.

[0052] The following will first briefly explain the initially selected sidelink resources.

[0053] In an embodiment of the present invention, a transmission block (TB) of a data packet to be transmitted may include one or more transmissions, the earliest of which is called the first transmission (abbreviated as initial transmission), and may also include one or more retransmissions, and thus one or more sidelink resources need to be selected.

[0054] In some embodiments, each data packet transmitted by the physical layer includes a corresponding priority, for example ProSe Per-Packet Priority (PPPP). The channel congestion level may also be represented by a Channel Busy Ratio (CBR). A selection range of the number of transmissions may be determined based on the PPPP of the data packet to be transmitted and the CBR of the sidelink resource pool, and the terminal device may select from the selection range to determine the number of transmissions of the transport block.

[0055] In some embodiments, the MAC layer of the terminal device sequentially selects at least one sidelink resource from the sidelink resource set based on the number of transmissions. The sidelink resource set S is the above-mentioned Set B at first, and the specific acquisition method thereof may refer to the above content. In addition, in the embodiments of the present invention, the terminal device may randomly select one sidelink resource each time, but the present invention is not limited thereto, for example, the terminal device may select multiple sidelink resources each time.

[0056] The following describes the initial selection of sidelink resources using one-by-one selection as an example.

[0057] 4 is a schematic diagram of one-by-one selection of sidelink resources according to an embodiment of the present invention, illustrating a situation where the number of transmissions is at least two, where n is the selection number, 1≦n≦N-1, and N is the number of transmissions (also referred to as the target number of transmissions). If the number of transmissions is one, only the following step 401 may be performed.

[0058] As shown in FIG. 4, the method includes the following steps.

[0059] Step 401: Randomly select one sidelink resource from the sidelink resource set with equal probability.

[0060] Taking n=1 as an example, the first time-frequency resource (denoted as R1) for transmission from Set B may be selected randomly with equal probability. For convenience of explanation, the nth selected sidelink resource is hereinafter referred to as R n It is expressed as:

[0061] Step 402: excluding the sidelink resource and the sidelink resource in the same slot as the sidelink resource from the sidelink resource set to form a first set.

[0062] R n After selection, R is selected from the candidate resource set.n itself, and R n We need to exclude all resources in the same slot as S. The resource set after the resources are excluded, i.e., the first set, is denoted as Sn (a subset of S). Take n=1 as an example, and the resource set after the resources are excluded is S1.

[0063] Step 403: The sidelink resources in the sidelink resource set, in which the slot (which may be referred to as the current slot) in which at least one sidelink resource among the first n selected sidelink resources is located, is within a first predetermined range, are defined as a second set.

[0064] In some embodiments, the first predefined range is [-K,K] slots, where K is an integer equal to or greater than 0. For example, the first predefined range may be within 32 slots, expressed as [-32,32] slots (including the current slot itself) or [-31,31] slots (excluding the current slot itself), i.e. starting from the sidelink resource to be compared, the first predefined range is the time range of 31 slots before and 31 slots after. However, the invention is not limited thereto and may be other ranges, such as within 16 slots, expressed as [-15,15] slots (excluding the current slot itself) or [-16,16] slots (including the current slot itself), or [-63,63] slots (excluding the current slot itself) or [-64,64] slots (including the current slot itself).

[0065] For example, when the nth resource selection is performed, R n After selection, {R1,R2,…R n A total of n resources, R1, R2, … R n}, the resources in Set B whose time interval is within [-K,K] slots are considered as satisfying the condition, and the selected resources {R1,R2,…R n}, let S' be the set of all candidate resources that satisfy the condition, i.e., the second set. n The present invention is not limited thereto, and can be expressed as {R1, R2, ... R n} and determine the second set based on these resources.

[0066] As shown in FIG. 4, the method may further include the following steps.

[0067] Step 404: Determine whether the intersection of the first set and the second set is empty; if it is empty, execute step 407; if it is not empty, execute step 405.

[0068] In some embodiments, after the last resource selection (S n ∩S' n )= (outside 1) If the result is TIFF2025066825000002.tif8169, the resource selection process is considered to be finished, and the N1 selected resources {R1, R2, … R N1}, where N1 <N。

[0069] Step 405: Randomly select sidelink resources from the intersection of the first set and the second set with equal probability.

[0070] That is, set S n ∩S' n The n+1th resource R n+1 are selected randomly with equal probability.

[0071] Step 406: Determine whether N sidelink resources have been selected, and if N sidelink resources have been selected, execute step 407; if N sidelink resources have not been selected, execute step 402 and continue to select sidelink resources one by one.

[0072] In some embodiments, when the resource selection process reaches the number of resources required for the target number of transmissions N, the resource selection process ends and the N1 selected resources {R1, R2, ... R N1}, where N1=N.

[0073] Step 407: Sort the selected sidelink resources according to time.

[0074] Step 408: Configuring the reordered sidelink resource or resources for one or more transmissions of the transport block.

[0075] In some embodiments, the earliest of the reordered sidelink resources is used for the initial transmission of the transport block and the i+1th resource is used for the i-th retransmission, where 1≦i≦N1-1, N1 being the number of reordered sidelink resources.

[0076] The above is a schematic illustration of the initial selection of sidelink resources with reference to FIG. 4, where every transmission corresponding to each selected resource (except for the resource that is transmitted first in time) is indicated and reserved by the SCI corresponding to the previous transmission.

[0077] It should be noted that the above FIG. 4 only shows a schematic diagram of an 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. 4.

[0078] Although the above briefly describes the initial selection of side link resources, the present invention is not limited thereto, and the initially selected side link resources may refer to related art. The following briefly describes the reselection of side link resources after the initial selection of side link resources.

[0079] In embodiments of the present invention, after the initial selection of sidelink resources, the terminal device may perform resource re-evaluation and / or pre-empt detection to decide whether to re-select the selected resources or not.

[0080] In the following, resource re-evaluation will be described first, and a method for reselecting resources upon resource re-evaluation may refer to Example 2 and Example 3 described later.

[0081] In some embodiments, a resource re-evaluation is performed at a time point prior to the initially selected i-th sidelink resource and determines that one or more sidelink resources of the sidelink control information are not in the reselection candidate resource set, where i is an integer.

[0082] For example, at a specific point in time during a certain period (defined as T3) before each SCI is transmitted, the resources reserved for this SCI (not including the current transmission in the same slot as the PSCCH in which the SCI is located, these resources are the resources originally reserved by the SCI) are re-evaluated to determine whether the reserved resources have been occupied by other UEs since the past certain period and whether the measured RSRP value is greater than the corresponding threshold value.

[0083] If the resource re-evaluation finds that the resource is occupied by other UEs and the RSRP value of the measured reference signal is greater than the corresponding threshold, the resource is not in the reselection candidate resource set reported after the resource re-evaluation process and the resource needs to be reselected.

[0084] Figure 5 is a diagram of one example of resource re-evaluation in an embodiment of the present invention. As shown in Figure 5, for example, #m1, #m2 and #m3 are sidelink resources transmitted three times among multiple transmissions of one TB, and are obtained by an initial selection process. Also, the SCI corresponding to #m1 is reserved by specifying #m2 and #m3.

[0085] As shown in Fig. 5, at a certain time point, which is separated by T3 before #m1, #m2 and #m3 need to be re-evaluated. If there is a resource (say #m2) that is not in the reselection candidate set after resource re-evaluation, it triggers resource re-selection for #m2.

[0086] The following describes preemption detection, but reference may be made to Examples 4 and 5 below for details on how to reselect resources upon preemption evaluation.

[0087] In some embodiments, preemption detection is performed for the initially selected jth sidelink resource and subsequent sidelink resources and it is determined that one or more sidelink resources of the sidelink control information are not in the reselection candidate resource set, where j is an integer.

[0088] For example, for a resource indicated and reserved by the SCI, if it is detected that the resource has been preempted by another UE, a resource reselection process may be triggered at a certain time point prior to the transmission corresponding to that resource.

[0089] FIG. 6 is a diagram of one example of preemption detection of an embodiment of the present invention. As shown in FIG. 6, for example, #m1, #m2, and #m3 are sidelink resources transmitted three times among multiple transmissions of one TB, and are obtained by an initial selection process. And #m1 indicates and reserves #m2 and #m3. If the UE finds that the resources of #m2 are preempted at some time after the transmission of #m1 and before the transmission of #m2, the UE may trigger a resource reselection for #m2 at or before the time T3 away from #m2.

[0090] In the embodiment of the present invention, for the first resource located earliest in time after the initial selection, reselection may be included in resource reevaluation or preemption detection. If the resource reevaluation determines that the resource overlaps with a resource reserved by another UE before transmission, resource reselection may be performed with reference to the preemption detection process of the following embodiment 4 and embodiment 5. For example, the resource reselection process may be performed for all selected resources, or reselection may be performed only for the first resource based on the time-frequency positions of the subsequent resources.

[0091] In some embodiments, the time interval between the reselected sidelink resource and a slot in which the Physical Sidelink Control Channel (PSCCH) of the sidelink control information is located is greater than or equal to a predetermined value (T3).

[0092] For example, in a resource re-evaluation process, the reselected resource and the slot in which the PSCCH corresponding to the SCI to be re-evaluated are located are separated by a distance of at least T3, i.e., the first slot that can be selected in time is the next slot included in the resource pool after n+T3, where n is the slot in which the PSCCH is located.

[0093] In some embodiments, for a reselected sidelink resource for which retransmission based on Hybrid Automatic Repeat reQuest (HARQ) feedback is enabled, if the reselected sidelink resource is fed back via the Physical Sidelink Feedback Channel (PSFCH) in the same slot as any of the selected resources or if the reselected sidelink resource is within a certain period of time for decoding of the Physical Sidelink Feedback Channel corresponding to any of the selected resources, then the retransmission based on Hybrid Automatic Repeat reQuest (HARQ) feedback for that reselected sidelink resource is disabled, or if the retransmission based on Hybrid Automatic Repeat reQuest (HARQ) feedback for all reselected sidelink resources is disabled.

[0094] For example, after resource reselection is triggered by resource reevaluation or preemption detection, if the time constraint that the reselected resource is a HARQ-ACK enabled transmission resource and is not fed back by the PSFCH resource in the same slot as either the reselected resource or the selected resource cannot be met, indicate HARQ-ACK disable in the SCI corresponding to the current reselected resource, or indicate HARQ-ACK disable in the SCI corresponding to all reselected resources this time. For transmissions for which HARQ-ACK disable is indicated, the receiving UE does not provide feedback in the PSFCH.

[0095] The above 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 embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0096] According to this embodiment, if one or more sidelink resources are not in the reselection candidate resource set, at least one sidelink resource is reselected from the sidelink resource set, and the currently reselected sidelink resource set is determined based on the time-frequency resources of the initially selected sidelink resource, thereby supporting more retransmissions and ensuring that the reselected resources transmitted multiple times are indicated and reserved by the sidelink control information.

[0097] <Example 2> The embodiment of the present invention performs resource reselection for one or more sidelink resources that are not in the reselection candidate resource set, where the resource collision or contention means, for example, that the UE detects that the resource used for a transmission overlaps with the resource reserved by another UE, and the detection result of the RSRP corresponding to the reference signal is greater than a threshold, or that the UE detects that the resource used for a transmission is completely the same as the resource reserved by another UE, where the resource is the initially selected resource.

[0098] In an embodiment of the present invention, if the resource re-evaluation process determines that a resource collision has occurred for resources reserved by the corresponding SCI, it may attempt to reselect only the conflicting resources without changing other resources being transmitted (i.e., withholding those resources that were initially selected).

[0099] For example, as shown in Fig. 5, if m2 is not in the reselection candidate set, then reselect one sidelink resource, if both m2 and m3 are not in the reselection candidate set, then reselect two sidelink resources, the other initially selected sidelink resources are still reserved.

[0100] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information maxis 2 or 3 and the sidelink resource not in the reselection candidate resource set is the (i+1)th or (i+2)th sidelink resource, reselection is performed to the (i+1)th or (i+2)th sidelink resource.

[0101] Then, re-select one sidelink resource from the sidelink resource set based on the time-frequency resources of the i-th sidelink resource and the i+2-th to N1-th sidelink resources, where 1≦i≦N1-2, N1 being the number of the initially selected sidelink resources.

[0102] In some embodiments, if the time interval between the i-th sidelink resource and the (i+2)-th sidelink resource is within a predefined range, one reselected sidelink resource satisfies the following conditions: the time interval between the selected sidelink resource and the i-th sidelink resource, and at least one of the (i+2)-th sidelink resource to the (N1)-th sidelink resource is within the predefined range, and the selected sidelink resource is not in a same slot as the i-th sidelink resource, and any of the (i+2)-th sidelink resource to the (N1)-th sidelink resource.

[0103] The reselected one sidelink resource further satisfies the following condition: the reselected one sidelink resource and any one of the 1st to N1th sidelink resources have not been fed back in the same slot of the Physical Sidelink Feedback Channel (PSFCH) and the slot in which the reselected one sidelink resource is located is not within a certain period (which may be a pre-determined or defined time, i.e., processing time) after the slot in which the PSFCH corresponding to the reselected one sidelink resource is located.

[0104] Preferably, the one reselected sidelink resource further satisfies the condition that the reselected sidelink resource is after a sidelink resource in the same slot as a Physical Sidelink Control Channel (PSCCH) of the sidelink control information.

[0105] FIG. 7 is a diagram of an example of sidelink resource reselection in case of resource re-evaluation in an embodiment of the present invention. For example, M sidelink resources are initially selected. N max Assume that in the resource re-evaluation process beginning at some point T3 away from #m1, where #m=2, it is determined that a collision has occurred for resource #m2.

[0106] As shown in Fig. 7, if resources #m1 and #m3 are within 32 slots, the absence of resource #m2 will not interrupt the chain of resource indications. In this case, reselection may be made for resource #m2 based on resources #m1, #m3, ... #M.

[0107] In the process of resource reselection, the selected resources #m1, #m3, ... #M may be reserved and another sidelink resource may be selected from the candidate set (candidate resources for reselection of #m2 shown in Figure 7) that satisfies the above time constraint based on their time-frequency locations.

[0108] For example, as shown in FIG. 7, one may select resource 701 and reorder resources #m1, #m3, . . . #M and resource 701 according to time for multiple transmissions after reselection.

[0109] In some embodiments, if the time interval between the ith sidelink resource and the (i+2)th sidelink resource is not within a predefined range, the reselected one sidelink resource satisfies the following conditions: the time interval between the reselected sidelink resource and the ith sidelink resource and at least one of the (i+2)th sidelink resource to the (N1)th sidelink resource is within a predefined range, the selected sidelink resource is not in the same slot with the ith sidelink resource and any of the (i+2)th sidelink resource to the (N1)th sidelink resource, the time intervals between the reselected sidelink resource and the ith sidelink resource and the (i+2)th sidelink resource are both within the predefined range, and the reselected sidelink resource is temporally after the ith sidelink resource and before the (i+2)th sidelink resource.

[0110] The reselected one sidelink resource further satisfies the following condition: the reselected one sidelink resource and any one of the 1st to N1th sidelink resources have not been fed back by the Physical Sidelink Feedback Channel (PSFCH) in the same slot, and the slot in which the reselected one sidelink resource is located is not within a certain period (i.e., processing time) after the slot in which the PSFCH corresponding to the reselected one sidelink resource is located.

[0111] Preferably, the one reselected sidelink resource further satisfies the condition that the reselected sidelink resource is after a sidelink resource in the same slot as a Physical Sidelink Control Channel (PSCCH) of the sidelink control information.

[0112] FIG. 8 is a diagram of another example of sidelink resource reselection in case of resource re-evaluation in an embodiment of the present invention. For example, M sidelink resources are initially selected. N maxAssume that in the resource re-evaluation process beginning at some point T3 away from #m1, where #m=2, it is determined that a collision has occurred for resource #m2.

[0113] As shown in Fig. 8, if resources #m1 and #m3 are not within 32 slots, the chain of resource indications is interrupted when resource #m2 is not present. In this case, reselection may be made for resource #m2 based on resources #m1, #m3, ... #M.

[0114] In the process of resource reselection, the selected resources #m1, #m3, ... #M may be reserved, and another sidelink resource may be selected from the candidate set (candidate resources for reselection of #m2 shown in Fig. 7) that satisfies the above time constraint based on their time-frequency locations. Compared with Fig. 7, the reselected resource needs to be within 32 slots of both resource #m1 and resource #m3, and be after resource #m1 and before resource #m3 in time.

[0115] For example, as shown in FIG. 8, resource 801 may be selected and resources #m1, #m3, . . . #M and resource 801 may be sorted according to time for multiple transmissions after reselection.

[0116] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max is 2 or 3 and the sidelink resource not in the reselection candidate resource set is the N1-th sidelink resource, the one reselected sidelink resource satisfies the following conditions: a time interval between the reselected sidelink resource and at least one of the i-th sidelink resource to the N1-1-th sidelink resource is within a predetermined range, and the reselected sidelink resource and any of the i-th sidelink resource to the N1-1-th sidelink resource are not in the same slot.

[0117] The reselected one sidelink resource further satisfies the following condition: the reselected one sidelink resource and any one of the 1st to N1th sidelink resources have not been fed back by the physical sidelink feedback channel (PSFCH) in the same slot, and the slot is not within a certain period (i.e., processing time) after the slot in which the PSFCH corresponding to the reselected one sidelink resource is located.

[0118] Preferably, the one reselected sidelink resource further satisfies the condition that the reselected sidelink resource is after a sidelink resource in the same slot as a Physical Sidelink Control Channel (PSCCH) of the sidelink control information.

[0119] With reference to Figs. 7 and 8, max The case of N = 2 was described as an example. max If = 3, then a resource re-evaluation process starting from a point in time T3 away before #m1 may have encountered a collision for either resource #m2 or #m3, and still have N max You may also refer to the case of =2.

[0120] For example, if resources #m1 and #m4 are within 32 slots, the absence of resources #m2 and #m3 will not interrupt the chain of resource indications. If resource #m2 collides and resource #m3 does not collides, reselection may be performed for resource #m2 based on resources #m1, #m3, #m4, ... #M. If resource #m3 collides and resource #m2 does not collides, reselection may be performed for resource #m3 based on resources #m1, #m2, #m4, ... #M. Based on their time-frequency positions, one resource may be selected from the candidate resources that satisfy the time constraint, see the example of FIG. 7.

[0121] As another example, if resources #m1 and #m4 are not within the 32 slots, then if either resource #m2 or #m3 collides, Nmax The scheme of =2 may be reused, see for example FIG. 8, the description of which is omitted here.

[0122] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max If the sidelink resource not included in the reselection candidate resource set is the (i+1)th and (i+2)th sidelink resources, reselection is performed on the (i+1)th and (i+2)th sidelink resources.

[0123] Then, re-select two sidelink resources from the sidelink resource set based on time-frequency resources of the i-th sidelink resource and the i+3-th to N1-th sidelink resources, where 1≦i≦N1-3, N1 is the number of the initially selected sidelink resources.

[0124] FIG. 9 is a diagram of another example of sidelink resource reselection in case of resource re-evaluation in an embodiment of the present invention. For example, M sidelink resources are initially selected. N max Assume that in the resource re-evaluation process beginning at some point T3 away from #m1, where #m=3, it is determined that a collision has occurred for resources #m2 and #m3.

[0125] As shown in Figure 9, if resources #m1 and #m4 are within 32 slots, the absence of resources #m2 and #m3 will not interrupt the chain of resource indications. If a collision occurs for both resources #m2 and #m3, reselection may be made for resources #m2 and #m3 based on resources #m1, #m4, ... #M. Two resources may be selected from the candidate resources that satisfy the time constraint based on their time-frequency positions.

[0126] In some embodiments, if the time interval between the ith sidelink resource and the (i+3)th sidelink resource is not within a predefined range, a first of the two reselected sidelink resources satisfies the following conditions: the time interval between the ith sidelink resource and at least one of the (i+3)th sidelink resource to the (N1)th sidelink resource is within the predefined range, and the first sidelink resource is not in the same slot with the ith sidelink resource and any of the (i+3)th sidelink resource to the (N1)th sidelink resource, and the time interval between the first sidelink resource and the ith sidelink resource or the (i+3)th sidelink resource is within the predefined range, and the first sidelink resource is temporally after the ith sidelink resource and before the (i+3)th sidelink resource.

[0127] The second side link resource of the two reselected side link resources satisfies the following conditions: if a time interval between the first side link resource and the i-th side link resource is within a predetermined range, time intervals between the second side link resource and the first side link resource and the (i+3)th side link resource are all within the predetermined range, and the second side link resource is temporally after the i-th side link resource and before the (i+3)th side link resource; and if a time interval between the first side link resource and the (i+3)th side link resource is within a predetermined range, time intervals between the second side link resource and the first side link resource and the (i+3)th side link resource are all within the predetermined range, and the second side link resource is temporally after the i-th side link resource and before the (i+3)th side link resource.

[0128] The two reselected sidelink resources further satisfy the following condition: the two reselected sidelink resources and any of the 1st to N1th sidelink resources have not been fed back by the Physical Sidelink Feedback Channel (PSFCH) in the same slot, and the slot in which they are located is not within a certain period (i.e., processing time) after the slot in which the PSFCH corresponding to the reselected sidelink resources is located.

[0129] FIG. 10 is a diagram of another example of sidelink resource reselection in case of resource re-evaluation in an embodiment of the present invention. For example, M sidelink resources are initially selected. N max Assume that in the resource re-evaluation process beginning at some point T3 away from #m1, where #m=3, it is determined that a collision has occurred for resources #m2 and #m3.

[0130] As shown in Fig. 10, if resources #m1 and #m4 are not within 32 slots, the chain of resource indications will be interrupted when a collision occurs for both resources #m2 and #m3. Based on resources #m1, #m4, ... #M, reselection may be performed for resource #m2. Meanwhile, compared with the case of Fig. 9, an additional time constraint is required, that is, the first resource to be reselected must be within 32 slots of resource #m1 or within 32 slots of resource #m4, and be after resource #m1 and before resource #m4 in time.

[0131] Also, if the first resource is within 32 slots of resource #m1, the second resource must be within 32 slots of resource #m4, and also within 32 slots of the first resource, and must be after resource #m1 in time and before resource #m4. If the first resource is within 32 slots of resource #m4, the second resource must be within 32 slots of resource #m1, and also within 32 slots of the first resource, and must be after resource #m1 in time and before resource #m4.

[0132] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max is 3 and the sidelink resources not in the reselection candidate resource set are the N1-1th and N1th sidelink resources, the first of the two sidelink resources to be reselected satisfies the following conditions: a time interval between the first sidelink resource and at least one of the i-th to N1-2th sidelink resources is within a predetermined range and the first sidelink resource and any of the i-th to N1-2th sidelink resources are not in the same slot; and a second of the two sidelink resources to be reselected satisfies the following conditions: a time interval between the second sidelink resource and at least one of the i-th to N1-2th sidelink resources and the first sidelink resource is within a predetermined range and the second sidelink resource and any of the i-th to N1-2th sidelink resources and the first sidelink resource are not in the same slot.

[0133] The two reselected sidelink resources further satisfy the following condition: the two reselected sidelink resources and any of the 1st to N1th sidelink resources have not been fed back by the Physical Sidelink Feedback Channel (PSFCH) of the same slot, and the slot in which they are located is not within a certain period (i.e., processing time) after the slot in which the PSFCH corresponding to any of the reselected sidelink resources is located.

[0134] The above 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 embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0135] According to this embodiment, if one or more sidelink resources are not in the reselection candidate resource set, at least one sidelink resource is reselected from the sidelink resource set, and the currently reselected sidelink resource set is determined based on the time-frequency resources of the initially selected sidelink resource, thereby supporting more retransmissions and ensuring that the reselected resources transmitted multiple times are indicated and reserved by the sidelink control information.

[0136] <Example 3> In the embodiment of the present invention, resource reselection is performed for one or more sidelink resources not included in the reselection candidate resource set and the subsequent sidelink resources one by one. In the resource reevaluation process, if it is determined that a resource collision occurs in the resource reserved by the corresponding SCI, reselection may be performed for the conflicting resource and all subsequent resources. The description of the same contents as in the second embodiment is omitted.

[0137] The third embodiment may be implemented independently or may be combined with the second embodiment. For example, the second embodiment may be implemented first, and if there is no resource that satisfies the time constraint condition, the third embodiment may be implemented. That is, reselection may be preferentially performed for the conflicted resource, and if there is no available resource, reselection may be performed for all subsequent resources to satisfy the time constraint.

[0138] In some embodiments, the sidelink resource selected in the first round of resource reselection is the sidelink resource in the same slot as the Physical Sidelink Control Channel (PSCCH) of the sidelink control information.

[0139] Fig. 11 is a diagram of another example of sidelink resource reselection in case of resource re-evaluation in an embodiment of the present invention. For example, M sidelink resources are initially selected as shown in Fig. 11. At some point in time T3 before resource #m1, resources #m2 and #m3 reserved by the SCI of resource #m1 are re-evaluated and if a collision is detected for resource #m2, a resource reselection process is triggered.

[0140] As shown in FIG. 11, resource #m1 may be regarded as the first resource reselected in the resource reselection process, and then reselection is performed for resources #m2, #m3, ... #M, that is, the target number of reselection is (M-m1) resources, and resource reselection is performed under the condition that the time constraint is satisfied.

[0141] In some embodiments, if other sidelink resources are reserved in the sidelink control information, no reselection is performed for the other sidelink resources, and the other sidelink resources are selected as the sidelink resources in the second resource reselection.

[0142] 11, preferably, resource #m1 and resource #m3 may be regarded as the first and second reselected resources in the resource reselection process, since resource #m3 does not have a resource collision, and then reselection is performed for resources #m2, #m4... #M, that is, the target number of reselection is (M-m1-1) resources.

[0143] In some embodiments, if other sidelink resources are reserved in the sidelink control information, no reselection is performed for the other sidelink resources, and the other sidelink resources are the sidelink resources selected in the first round of resource reselection.

[0144] For example, resource #m3 may be regarded as the first reselected resource in the resource reselection process, and then reselection is performed for resources #m1, #m2, #m4... #M, i.e., the target number of reselection is (M-m1) resources, and resource reselection is performed under the condition that the time constraint is satisfied.

[0145] In some embodiments, the sidelink resource selected in the second round of resource reselection is the sidelink resource in the same slot as the Physical Sidelink Control Channel (PSCCH) of the sidelink control information.

[0146] For example, resource #m3 and resource #m1 may be considered as the first and second reselected resources in the resource reselection process, and reselection is performed for resources #m2, #m4, ... #M, i.e., the target number of reselection is (M-m1-1) resources.

[0147] In some embodiments, the step of performing resource reselection one by one for one or more sidelink resources not in the reselection candidate resource set and the subsequent sidelink resources comprises the following steps:

[0148] If the number of reselected resources is n, select the n+1th sidelink resource, where 1≦n≦N−1, N is the number of sidelink resources in the same slot as the sidelink control information among the initially selected sidelink resources and the subsequent resources selected in the initial resource selection process.

[0149] For example, a first set is formed by excluding the first n sidelink resources and a sidelink resource in the same slot as the nth sidelink resource from the sidelink resource set, and a second set is formed of sidelink resources in the sidelink resource set that have a time interval with at least one of the first n selected sidelink resources within a predetermined range, and the n+1th sidelink resource is randomly selected with equal probability from the intersection of the first set and the second set.

[0150] In some embodiments, if retransmission based on Hybrid Automatic Repeat Request (HARQ) feedback is enabled, the first set is formed by excluding from the sidelink resource set the nth sidelink resource, the sidelink resources in the same slot as the nth sidelink resource, the sidelink resources in the same slot as a Physical Sidelink Feedback Channel (PSFCH) corresponding to the nth sidelink resource and the sidelink resources within a certain time period after the PSFCH.

[0151] In some embodiments, if N sidelink resources have been selected or if the intersection of the first set and the second set is empty, the selected sidelink resources are sorted according to time.

[0152] For a method of performing resource selection one by one, reference may be made to FIG. 4 and related art.

[0153] The resource reselection process may be performed with the new candidate resource set (which may be referred to as the reselection candidate resource set) reported after resource reevaluation. For conflicting resources, the resources after reselection are different from the resources before reselection. For non-conflicting resources, the resources after reselection may be the same as or different from the resources before reselection. If the required number of resources cannot be reselected under the above time constraint conditions after resource reselection, the transmission of the current TB may not reach the target transmission number, i.e., the number of resources after reselection may be smaller than the number M of initially selected resources.

[0154] The above 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 embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0155] According to this embodiment, if one or more sidelink resources are not in the reselection candidate resource set, at least one sidelink resource is reselected from the sidelink resource set, and the currently reselected sidelink resource set is determined based on the time-frequency resources of the initially selected sidelink resource, thereby supporting more retransmissions and ensuring that the reselected resources transmitted multiple times are indicated and reserved by the sidelink control information.

[0156] <Example 4> An embodiment of the present invention performs resource reselection for one or more sidelink resources that are not in the reselection candidate resource set, where resource collision or contention means, for example, when a UE detects that a resource used for a particular transmission has been preempted by another UE.

[0157] In an embodiment of the present invention, in the process of preemption detection, if a resource collision occurs for resources indicated and reserved by the corresponding SCI, reselection may be attempted only for the conflicting resources without changing other transmission resources.

[0158] For example, as shown in Fig. 6, if #m2 is preempted and is not in the reselection candidate set, reselect one sidelink resource, if both #m2 and #m3 are not in the reselection candidate set, reselect two sidelink resources, the other initially selected sidelink resources are still reserved.

[0159] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max is 2 or 3 and the sidelink resource not in the reselection candidate resource set is the jth sidelink resource, reselection is performed to the jth sidelink resource.

[0160] Then, reselect sidelink resources from the sidelink resource set based on time-frequency resources of the j+1th sidelink resource to the N1th sidelink resource, where 1≦j≦N1-1, N1 being the number of the initially selected sidelink resources.

[0161] In some embodiments, a reselected sidelink resource satisfies the following conditions: the time interval between the selected sidelink resource and at least one of the (j+1)th sidelink resource to the (N1)th sidelink resource is within a predetermined range, and the selected sidelink resource and any of the (j+1)th sidelink resource to the (N1)th sidelink resource are not in the same slot.

[0162] The reselected sidelink resource further satisfies the following condition: the reselected sidelink resource and any one of the 1st to N1th sidelink resources have not been fed back by the Physical Sidelink Feedback Channel (PSFCH) in the same slot, and the slot in which the reselected sidelink resource is located is not within a certain period (i.e., processing time) after the slot in which the PSFCH corresponding to the reselected sidelink resource is located.

[0163] FIG. 12 is a diagram of an example of sidelink resource reselection in case of preemption detection in an embodiment of the present invention. For example, M sidelink resources are initially selected. N max = 2, and preemption detection is started at a certain point before resource #m2, which is designated and reserved by the SCI of resource #m1, and it is determined that contention has occurred in resource #m2.

[0164] As shown in Fig. 12, reselection may be performed for resource #m2 based on the resources following resource #m2, i.e., resources #m3, ..., #M. That is, in the resource selection process, resources #m3, ..., #M selected in the initial selection are reserved, and one resource is reselected from the candidate resources that satisfy the time constraint condition based on their time-frequency positions.

[0165] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max is 3, and a reselected sidelink resource satisfies the following conditions: the reselected sidelink resource is after another sidelink resource indicated by the same sidelink control information, the other sidelink resource is in the reselection candidate resource set and is after the slot of the sidelink control information.

[0166] FIG. 13 is a diagram of another example of sidelink resource reselection in case of preemption detection in accordance with an embodiment of the present invention. For example, M sidelink resources are initially selected. N max= 3, and preemption detection is started at a certain point before resource #m2, which is indicated and reserved by the SCI of resource #m1, and it is determined that contention has occurred in resource #m2.

[0167] 13, reselection may be performed for resource #m2 based on resources subsequent to resource #m2, i.e., resources #m3, ..., #M. That is, in the resource selection process, resources #m3, ..., #M selected in the initial selection are reserved, and one resource is reselected from the candidate resources that satisfy the time constraint condition based on their time-frequency positions.

[0168] For example, the reselected resource must satisfy an additional time constraint, i.e., the subsequently selected resource must be behind in time a resource that is both indicated and non-conflicting (e.g., resource #m3 shown in FIG. 13), thereby avoiding indicated, non-reserved resources and further improving reliability.

[0169] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max If the sidelink resource not included in the reselection candidate resource set is the jth and j+1th sidelink resources, reselection is performed on the jth and j+1th sidelink resources.

[0170] Then, reselect two sidelink resources from the sidelink resource set based on the time-frequency resources of the j+2th sidelink resource to the N1th sidelink resource, where 1≦j≦N1-2, N1 is the number of the initially selected sidelink resources.

[0171] In some embodiments, a first of the two reselected sidelink resources satisfies the following conditions: a time interval between the first sidelink resource and at least one of the (j+2)th sidelink resource to the (N1)th sidelink resource is within a predetermined range, and the first sidelink resource and any of the (j+2)th sidelink resource to the (N1)th sidelink resource are not in the same slot.

[0172] The second sidelink resource of the two reselected sidelink resources satisfies the following condition: a time interval between the second sidelink resource and at least one of the (j+2)th sidelink resource to the (N1)th sidelink resource and the first sidelink resource is within the predetermined range, and the second sidelink resource is not in the same slot as any of the (j+2)th sidelink resource to the (N1)th sidelink resource and the first sidelink resource.

[0173] In some embodiments, the two reselected sidelink resources further satisfy the following condition: the two reselected sidelink resources and any of the 1st to N1th sidelink resources have not been fed back in the Physical Sidelink Feedback Channel (PSFCH) of the same slot and the slot in which they are located is not within a certain period (i.e. processing time) after the slot in which the PSFCH corresponding to the reselected two sidelink resources is located.

[0174] For example, as shown in FIG. 13, if a collision occurs between the current resource and a resource reserved with the same SCI (e.g., resource #m2 and resource #m3 shown in FIG. 13), reselection may be performed for resource #m2 based on resources #m4, ... #M.

[0175] The above 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 embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0176] According to this embodiment, if one or more sidelink resources are not in the reselection candidate resource set, at least one sidelink resource is reselected from the sidelink resource set, and the currently reselected sidelink resource set is determined based on the time-frequency resources of the initially selected sidelink resource, thereby supporting more retransmissions and ensuring that the reselected resources transmitted multiple times are indicated and reserved by the sidelink control information.

[0177] <Example 5> The embodiment of the present invention performs resource reselection one by one for one or more sidelink resources not in the reselection candidate resource set and the subsequent sidelink resources. In the preemption detection process, if it is determined that a resource collision occurs for a resource reserved by the corresponding SCI, reselection may be performed for the conflicted resource and all subsequent resources. The description of the same contents as in the fourth embodiment is omitted.

[0178] The fifth embodiment may be implemented independently or may be combined with the fourth embodiment. For example, the fourth embodiment may be implemented first, and if there is no resource that satisfies the time constraint condition, the fifth embodiment may be implemented. That is, reselection may be preferentially performed for the conflicted resource, and if there is no available resource, reselection may be performed for all subsequent resources to satisfy the time constraint.

[0179] In some embodiments, when it is determined that the currently transmitted resource has been preempted by another UE, resource reselection is performed for both the currently transmitted resource and the selected resource located after it in time, for example, by first randomly selecting one resource in a selection window for reselection, and then reselecting the subsequent resources one by one according to a time constraint.

[0180] In some embodiments, if other sidelink resources are reserved in the sidelink control information, the other sidelink resources shall be the sidelink resources selected in the first round of resource reselection, and the resources of the resource reselection shall be after the other sidelink resources.

[0181] For example, N max If =3, when the current resource has been preempted and there is a specified resource (at most one, for example, resource #m3 shown in FIG. 13) that is temporally behind the current resource, after triggering the resource reselection process, the resource may be considered as the resource initially selected in the resource reselection process, and the remaining resources may be reselected.

[0182] As another example, the reselected resource must satisfy an additional time constraint, i.e. the subsequently selected resource must be located in time after the specified resource, which allows avoiding resources for which no reservation is indicated, further improving reliability.

[0183] In some embodiments, performing resource reselection one by one for the one or more sidelink resources not in the reselection candidate resource set and the subsequent sidelink resources comprises selecting an m+1-th sidelink resource if the number of reselected resources is m, where 1≦m≦M−1, M being the number of resources after the sidelink resource in the same slot as the sidelink control information among the initially selected sidelink resources.

[0184] Specifically, for example, a first set is formed by excluding the first m side link resources and a side link resource in the same slot as the mth side link resource from the side link resource set, and a second set is formed of side link resources in the side link resource set whose time interval with at least one of the first m selected side link resources is within a predetermined range, and the m+1th side link resource is randomly selected with equal probability from the intersection of the first set and the second set.

[0185] In some embodiments, if retransmission based on Hybrid Automatic Repeat Request (HARQ) feedback is enabled, the first set is formed by excluding from the sidelink resource set the nth sidelink resource, the sidelink resources in the same slot as the nth sidelink resource, the sidelink resources in the same slot as a Physical Sidelink Feedback Channel (PSFCH) corresponding to the nth sidelink resource and the sidelink resources within a certain time period after the PSFCH.

[0186] In some embodiments, if M sidelink resources have been selected or if the intersection of the first set and the second set is empty, the selected sidelink resources are sorted according to time.

[0187] For a method of performing resource selection one by one, reference may be made to FIG. 4 and related art.

[0188] The resource reselection process may be performed with the new candidate resource set (which may be referred to as reselection candidate resource set) reported after preemption detection. For conflicted resources, the resources after reselection are different from the resources before reselection. For non-conflicted resources, the resources after reselection may be the same as or different from the resources before reselection. After resource reselection, if the required number of resources cannot be reselected under the above time constraint, the transmission of the current TB may not reach the target transmission number, i.e., the number of resources after reselection may be smaller than the number M of initially selected resources.

[0189] The above 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 embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0190] According to this embodiment, if one or more sidelink resources are not in the reselection candidate resource set, at least one sidelink resource is reselected from the sidelink resource set, and the currently reselected sidelink resource set is determined based on the time-frequency resources of the initially selected sidelink resource, thereby supporting more retransmissions and ensuring that the reselected resources transmitted multiple times are indicated and reserved by the sidelink control information.

[0191] <Example 6> An embodiment of the present invention provides a device for reselecting sidelink resources. The device may be, for example, a terminal device (e.g., the above-mentioned terminal device), or may be one or more elements or components configured in the terminal device. Descriptions of contents similar to those in the first embodiment will be omitted.

[0192] 14 is a schematic diagram of a sidelink resource reselection apparatus 1400 according to an embodiment of the present invention. As shown in FIG. 14, the sidelink resource reselection apparatus 1400 includes the following units:

[0193] The processing unit 1401 performs resource re-evaluation and / or preemption detection on the initially selected sidelink resources for multiple transmissions of the transport block.

[0194] The reselector 1402 reselects at least one sidelink resource from the sidelink resource set if one or more sidelink resources are not in the reselection candidate resource set, where the reselector 1402 determines the currently reselected sidelink resource set based on the time-frequency resources of the initially selected sidelink resource.

[0195] In some embodiments, the processing unit 1401 performs the resource re-evaluation at a time point prior to the initially selected i-th sidelink resource and determines that one or more sidelink resources of the sidelink control information are not in the reselection candidate resource set, where i is an integer.

[0196] The reselector 1402 performs resource reselection on the one or more sidelink resources that are not in the reselection candidate resource set.

[0197] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max is 2 or 3 and the sidelink resource not in the reselection candidate resource set is the (i+1)th or (i+2)th sidelink resource, reselection is performed to the (i+1)th or (i+2)th sidelink resource.

[0198] Then reselect sidelink resources from the sidelink resource set based on time-frequency resources of the i-th sidelink resource and the i+2-th to N1-th sidelink resources, where 1≦i≦N1-2, N1 being the number of the initially selected sidelink resources.

[0199] In some embodiments, if the time interval between the i-th sidelink resource and the (i+2)-th sidelink resource is within a predefined range, the reselected sidelink resource satisfies the following conditions: the time interval between the selected sidelink resource and the i-th sidelink resource, and at least one of the (i+2)-th sidelink resource to the (N1)-th sidelink resource is within the predefined range, and the selected sidelink resource is not in the same slot as the i-th sidelink resource, and any of the (i+2)-th sidelink resource to the (N1)-th sidelink resource.

[0200] In some embodiments, if the time interval between the ith sidelink resource and the (i+2)th sidelink resource is not within a predefined range, the reselected sidelink resource satisfies the following conditions: the time interval between the reselected sidelink resource and the ith sidelink resource and at least one of the (i+2)th sidelink resource to the (N1)th sidelink resource is within a predefined range, and the selected sidelink resource is not in the same slot with the ith sidelink resource and any of the (i+2)th sidelink resource to the (N1)th sidelink resource, and the time intervals between the reselected sidelink resource and the ith sidelink resource and the (i+2)th sidelink resource are both within the predefined range, and the reselected sidelink resource is temporally after the ith sidelink resource and before the (i+2)th sidelink resource.

[0201] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information maxis 2 or 3 and the sidelink resource not in the reselection candidate resource set is the N1-th sidelink resource, the reselected sidelink resource satisfies the following conditions: a time interval between the reselected sidelink resource and at least one of the i-th sidelink resource to the N1-1-th sidelink resource is within a predetermined range, and the reselected sidelink resource is not in the same slot as any of the i-th sidelink resource to the N1-1-th sidelink resource.

[0202] In some embodiments, the reselected sidelink resource further satisfies the following condition: the reselected sidelink resource and any of the 1st to N1th sidelink resources are not fed back in the same slot of the physical sidelink feedback channel and the slot in which the reselected sidelink resource is located is not within a certain time period after the slot in which the physical sidelink feedback channel corresponding to the reselected sidelink resource is located.

[0203] In some embodiments, the reselected sidelink resource further satisfies the condition that the reselected sidelink resource is after a sidelink resource in the same slot as the physical sidelink control channel of the sidelink control information.

[0204] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max If i+1 is 3 and the sidelink resources not included in the reselection candidate resource set are the (i+1)th and (i+2)th sidelink resources, reselection is performed to the (i+1)th and (i+2)th sidelink resources.

[0205] Then reselect two sidelink resources from a sidelink resource set based on time-frequency resources of the i-th sidelink resource and the i+3-th to N1-th sidelink resources, where 1≦i≦N1-3, N1 being the number of the initially selected sidelink resources.

[0206] In some embodiments, if the time interval between the ith sidelink resource and the (i+3)th sidelink resource is not within a predefined range, a first of the two reselected sidelink resources satisfies the following conditions: the time interval between the ith sidelink resource and at least one of the (i+3)th sidelink resource to the (N1)th sidelink resource is within the predefined range, and the first sidelink resource is not in the same slot with the ith sidelink resource and any of the (i+3)th sidelink resource to the (N1)th sidelink resource, and the time interval between the first sidelink resource and the ith sidelink resource or the (i+3)th sidelink resource is within the predefined range, and the first sidelink resource is temporally after the ith sidelink resource and before the (i+3)th sidelink resource.

[0207] In some embodiments, the second of the two reselected sidelink resources satisfies the following conditions: if a time interval between the first sidelink resource and the i-th sidelink resource is within a predetermined range, time intervals between the second sidelink resource and the first sidelink resource and the i+3-th sidelink resource are both within the predetermined range, and the second sidelink resource is temporally after the i-th sidelink resource and before the i+3-th sidelink resource; and if a time interval between the first sidelink resource and the i+3-th sidelink resource is within a predetermined range, time intervals between the second sidelink resource and the first sidelink resource and the i-th sidelink resource are both within the predetermined range, and the second sidelink resource is temporally after the i-th sidelink resource and before the i+3-th sidelink resource.

[0208] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max is 3 and the sidelink resources not in the reselection candidate resource set are the N1-1th and N1th sidelink resources, the first of the two reselected sidelink resources satisfies the following condition: a time interval between the first sidelink resource and at least one of the i-th sidelink resource to the N1-2th sidelink resource is within a predetermined range, and the first sidelink resource and any of the i-th sidelink resource to the N1-2th sidelink resource are not in the same slot.

[0209] The second of the two reselected sidelink resources satisfies the following condition: a time interval between the second sidelink resource and at least one of the i-th sidelink resource through the N1-2-th sidelink resource and the first sidelink resource is within a predetermined range, and the second sidelink resource is not in the same slot as any of the i-th sidelink resource through the N1-2-th sidelink resource and the first sidelink resource.

[0210] The two reselected sidelink resources further satisfy the following condition: the two reselected sidelink resources and any one of the 1st to N1th sidelink resources have not been fed back by the PSFCH in the same slot, and the slot in which they are located is not within a certain period after the slot in which the PSFCH corresponding to the two reselected sidelink resources is located.

[0211] In some embodiments, the processing unit 1401 performs the resource re-evaluation at a time point prior to the initially selected i-th sidelink resource and determines that one or more sidelink resources of the sidelink control information are not in the reselection candidate resource set, where i is an integer.

[0212] The reselector 1402 performs resource reselection for one or more sidelink resources not included in the reselection candidate resource set and the subsequent sidelink resources one by one. If the number of reselected resources is n, the reselector 1402 selects the n+1th sidelink resource, where 1≦n≦N−1, N is the number of sidelink resources in the same slot as the sidelink control information among the initially selected sidelink resources and the subsequent resources selected in the initial resource selection process.

[0213] In some embodiments, a first set is formed by excluding the first n sidelink resources and a sidelink resource in the same slot as the nth sidelink resource from the sidelink resource set, a second set is formed of sidelink resources in the sidelink resource set that have a time interval within a predetermined range with at least one sidelink resource among the first n selected sidelink resources, and a n+1th sidelink resource is randomly selected with equal probability from the intersection of the first set and the second set.

[0214] In some embodiments, the sidelink resource selected in the first round of resource reselection is the sidelink resource in the same slot as the physical sidelink control channel of the sidelink control information.

[0215] If another sidelink resource is reserved in the sidelink control information, no reselection is performed for the other sidelink resource, and the other sidelink resource is selected as the sidelink resource selected in the second resource reselection.

[0216] In some embodiments, if other sidelink resources are reserved in the sidelink control information, no reselection is performed for the other sidelink resources, and the other sidelink resources are taken as the sidelink resources selected in the first round of resource reselection. The sidelink resources in the same slot as the physical sidelink control channel of the sidelink control information are taken as the sidelink resources selected in the second round of resource reselection.

[0217] In some embodiments, the processing unit 1401 performs the preemption detection for the initially selected jth sidelink resource and subsequent sidelink resources and determines that one or more sidelink resources of the sidelink control information are not in the reselection candidate resource set, where j is an integer.

[0218] The reselector 1402 performs resource reselection for the one or more sidelink resources that are not in the reselection candidate resource set.

[0219] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max is 2 or 3 and the sidelink resource not in the reselection candidate resource set is the jth sidelink resource, reselection is performed to the jth sidelink resource.

[0220] Then, reselect sidelink resources from the sidelink resource set based on time-frequency resources of the j+1th sidelink resource to the N1th sidelink resource, where 1≦j≦N1-1, N1 being the number of the initially selected sidelink resources.

[0221] In some embodiments, the reselected sidelink resource satisfies the following conditions: a time interval between the selected sidelink resource and at least one of the (j+1)th sidelink resource to the (N1)th sidelink resource is within a predetermined range, and the selected sidelink resource and any of the (j+1)th sidelink resource to the (N1)th sidelink resource are not in the same slot.

[0222] The reselected sidelink resource further satisfies the following condition: the reselected sidelink resource and any one of the 1st to N1th sidelink resources have not been fed back by the PSFCH in the same slot, and the slot in which the reselected sidelink resource is located is not within a certain period after the slot in which the PSFCH corresponding to the reselected sidelink resource is located.

[0223] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information maxis 3 and the reselected sidelink resource satisfies the following conditions: the reselected sidelink resource is after another sidelink resource indicated by the same sidelink control information, the other sidelink resource is in the reselection candidate resource set and is after the slot of the sidelink control information.

[0224] In some embodiments, the maximum number of resources N that can be indicated in the sidelink control information max If the sidelink resource not included in the reselection candidate resource set is the jth and j+1th sidelink resources, reselection is performed on the jth and j+1th sidelink resources.

[0225] Then, reselect two sidelink resources from the sidelink resource set based on the time-frequency resources of the j+2th sidelink resource to the N1th sidelink resource, where 1≦j≦N1-2, N1 is the number of the initially selected sidelink resources.

[0226] In some embodiments, a first of the two reselected sidelink resources satisfies the following conditions: a time interval between the first sidelink resource and at least one of the (j+2)th sidelink resource to the (N1)th sidelink resource is within a predetermined range, and the first sidelink resource and any of the (j+2)th sidelink resource to the (N1)th sidelink resource are not in the same slot.

[0227] The second of the two reselected sidelink resources satisfies the following condition: a time interval between the second sidelink resource and at least one of the (j+2)th sidelink resource to the (N1)th sidelink resource and the first sidelink resource is within the predetermined range, and the second sidelink resource is not in the same slot as any of the (j+2)th sidelink resource to the (N1)th sidelink resource and the first sidelink resource.

[0228] The two reselected sidelink resources further satisfy the following condition: the two reselected sidelink resources and any one of the 1st to N1th sidelink resources have not been fed back by the PSFCH in the same slot, and the slot in which they are located is not within a certain period after the slot in which the PSFCH corresponding to the two reselected sidelink resources is located.

[0229] In some embodiments, the processing unit 1401 performs the preemption detection for the initially selected jth sidelink resource and subsequent sidelink resources and determines that one or more sidelink resources of the sidelink control information are not in the reselection candidate resource set, where j is an integer.

[0230] The reselector 1402 performs resource reselection one by one for one or more sidelink resources not included in the reselection candidate resource set and the subsequent sidelink resources, and selects the (m+1)th sidelink resource when the number of reselected resources is m, where 1≦m≦M−1, M is the number of resources following the sidelink resource in the same slot as the sidelink control information among the initially selected sidelink resources.

[0231] In some embodiments, a first set is formed by excluding the first m sidelink resources and a sidelink resource in the same slot as the mth sidelink resource from the sidelink resource set, a second set is formed of sidelink resources in the sidelink resource set that are within a predetermined time interval with at least one sidelink resource among the first m selected sidelink resources, and a m+1th sidelink resource is randomly selected with equal probability from the intersection of the first set and the second set.

[0232] In some embodiments, if other sidelink resources are reserved in the sidelink control information, the other sidelink resources shall be the first selected sidelink resources of the resource reselection, and the resources of the resource reselection shall be after the other sidelink resources.

[0233] In some embodiments, the time interval between the reselected sidelink resource and the slot in which the physical sidelink control channel of the sidelink control information resides is greater than or equal to a predefined value.

[0234] In some embodiments, for a reselected sidelink resource for which hybrid automatic repeat request feedback based retransmission is enabled, hybrid automatic repeat request feedback based retransmission is disabled for that reselected sidelink resource if the reselected sidelink resource is fed back by the physical sidelink feedback channel in the same slot as any of the selected resources or if the reselected sidelink resource is within a certain period of time for decoding of the physical sidelink feedback channel corresponding to any of the selected resources, or hybrid automatic repeat request feedback based retransmission is disabled for all reselected sidelink resources.

[0235] The above 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 embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be used in combination.

[0236] 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 1400 may further include other components or modules. For specific contents of these components or modules, reference may be made to the related art.

[0237] Furthermore, for convenience of explanation, Fig. 14 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.

[0238] According to this embodiment, if one or more sidelink resources are not in the reselection candidate resource set, at least one sidelink resource is reselected from the sidelink resource set, and the currently reselected sidelink resource set is determined based on the time-frequency resources of the initially selected sidelink resource, thereby supporting more retransmissions and ensuring that the reselected resources transmitted multiple times are indicated and reserved by the sidelink control information.

[0239] <Example 7> 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 sixth embodiments will be omitted.

[0240] In some embodiments, the communication system 100 may include at least a terminal device.

[0241] The terminal device performs resource re-evaluation and / or preemption detection on initially selected sidelink resources for multiple transmissions of a transport block, and reselects at least one sidelink resource from the sidelink resource set if one or more sidelink resources are not in the reselection candidate resource set, where the terminal device determines a currently reselected sidelink resource set based on the time-frequency resources of the initially selected sidelink resources.

[0242] 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.

[0243] Fig. 15 is a schematic diagram of a network device according to an embodiment of the present invention. As shown in Fig. 15, the network device 1500 may include a processor 1510 (e.g., a central processing unit (CPU)) and a memory 1520, and the memory 1520 is connected to the processor 1510. The memory 1520 may store various data, and further stores an information processing program 1530, and executes the program 1530 under the control of the processor 1510.

[0244] Also, as shown in Fig. 15, the network device 1500 may further include a transceiver 1540 and an antenna 1550. 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 1500 to include all the units shown in Fig. 15. Also, the network device 1500 may further include units not shown in Fig. 15, and may refer to the prior art.

[0245] The embodiment of the present invention further provides a terminal device, but the present invention is not limited thereto and may be other devices.

[0246] Fig. 16 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in Fig. 16, the terminal device 1600 may include a processor 1610 and a memory 1620, which stores data and programs and is connected to the processor 1610. 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.

[0247] For example, the processor 1610 may execute a program to realize the sidelink resource reselection method according to any of the first to fifth embodiments. For example, the processor 1610 may be configured to perform resource re-evaluation and / or preemption detection on initially selected sidelink resources for multiple transmissions of a transport block, and to reselect at least one sidelink resource from a sidelink resource set if one or more sidelink resources are not in a reselection candidate resource set, and to determine a currently reselected sidelink resource set based on the time-frequency resources of the initially selected sidelink resources.

[0248] Also, as shown in Fig. 16, the terminal device 1600 may further include a communication module 1630, an input unit 1640, a display 1650, and a power source 1660. Here, the functions of the above units are similar to those of the prior art, and the description thereof will be omitted here. It is not necessary for the terminal device 1600 to include all the units shown in Fig. 16. Also, the terminal device 1600 may further include units not shown in Fig. 16, and may refer to the prior art.

[0249] 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 5.

[0250] 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 5 when the program is executed.

[0251] 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.

[0252] 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).

[0253] 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 and 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.

[0254] 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.

[0255] 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.

[0256] Furthermore, the following supplementary notes are disclosed regarding the embodiments including the above-mentioned examples. (Appendix 1) A method for sidelink resource reselection, comprising: performing resource re-evaluation and / or preemption detection on initially selected sidelink resources for multiple transmissions of the transport block; reselecting at least one sidelink resource from the sidelink resource set if one or more sidelink resources are not in the reselection candidate resource set, determining a currently reselected sidelink resource set based on time-frequency resources of the initially selected sidelink resources. (Appendix 2) 2. The method of claim 1, wherein the resource re-evaluation is performed at a time point prior to the initially selected i-th sidelink resource and wherein it is determined that one or more sidelink resources of the sidelink control information are not in a reselection candidate resource set, where i is an integer. (Appendix 3) 3. The method of claim 2, wherein resource reselection is performed for the one or more sidelink resources that are not in a reselection candidate resource set. (Appendix 4) The maximum number N of resources that can be indicated in the sidelink control information max if the sidelink resource not included in the reselection candidate resource set is the i+1-th or i+2-th sidelink resource, reselect the i+1-th or i+2-th sidelink resource; 4. The method of claim 3, further comprising reselecting sidelink resources from a sidelink resource set based on time-frequency resources of the i-th sidelink resource and the i+2-th to N1-th sidelink resources, where 1≦i≦N1-2, N1 being the number of the initially selected sidelink resources. (Appendix 5) If the time interval between the i-th sidelink resource and the i+2-th sidelink resource is within a predetermined range, the reselected sidelink resource is: 5. The method according to claim 4, wherein a time interval between the selected sidelink resource and at least one of the i-th sidelink resource and the (i+2)-th to (N1)-th sidelink resource is within the predetermined range, and the selected sidelink resource is not in a same slot with the i-th sidelink resource and any of the (i+2)-th to (N1)-th sidelink resource. (Appendix 6) If the time interval between the i-th sidelink resource and the i+2-th sidelink resource is not within a predetermined range, the reselected sidelink resource is: a time interval between the reselected sidelink resource and at least one of the i-th sidelink resource and the i+2-th to N1-th sidelink resource is within a predetermined range, and the selected sidelink resource is not in the same slot as the i-th sidelink resource and any of the i+2-th to N1-th sidelink resource; and 5. The method of claim 4, wherein a time interval between the reselected sidelink resource and the i-th sidelink resource and the i+2-th sidelink resource is within the predetermined range, and the reselected sidelink resource is temporally after the i-th sidelink resource and before the i+2-th sidelink resource. (Appendix 7) The maximum number N of resources that can be indicated in the sidelink control information max If the sidelink resource not in the reselection candidate resource set is the N1-th sidelink resource, the reselected sidelink resource is 7. The method according to any of claims 4 to 6, wherein a time interval between the reselected sidelink resource and at least one of the i-th to N1-1-th sidelink resource is within a predetermined range, and the reselected sidelink resource and any of the i-th to N1-1-th sidelink resource are not in a same slot. (Appendix 8) The reselected sidelink resources include: 8. The method according to any of claims 4 to 7, further comprising the following condition: the reselected sidelink resource and any of the 1st to N1th sidelink resources are not fed back by a Physical Sidelink Feedback Channel (PSFCH) in the same slot and the slot in which they are located is not within a certain period (i.e. processing time) after the slot in which the PSFCH corresponding to the any of the reselected sidelink resources is located. (Appendix 9) The reselected sidelink resources include: 9. The method of any of claims 4 to 8, further satisfying a condition that the reselected sidelink resource is after a sidelink resource in the same slot as a Physical Sidelink Control Channel (PSFCH) of the sidelink control information. (Appendix 10) The maximum number N of resources that can be indicated in the sidelink control information max if , ... 4. The method of claim 3, wherein reselecting two sidelink resources from a sidelink resource set based on time-frequency resources of the i-th sidelink resource and the (i+3)-th sidelink resource to the (N1)-th sidelink resource, where 1≦i≦N1-3, N1 being the number of the initially selected sidelink resources. (Appendix 11) If the time interval between the i-th sidelink resource and the (i+3)-th sidelink resource is not within a predetermined range, the first of the two reselected sidelink resources is: a time interval between the first sidelink resource and the i-th sidelink resource and at least one of the i+3-th to N1-th sidelink resources is within the predetermined range, and the first sidelink resource and any of the i-th sidelink resource and the i+3-th to N1-th sidelink resources are not in the same slot; and 11. The method of claim 10, wherein a time interval between the first sidelink resource and the i-th sidelink resource or the i+3-th sidelink resource is within the predetermined range and the first sidelink resource is temporally after the i-th sidelink resource and before the i+3-th sidelink resource. (Appendix 12) The second of the two sidelink resources to be reselected is when a time interval between the first side link resource and the i-th side link resource is within a predetermined range, time intervals between the second side link resource and the first side link resource and the i+3-th side link resource are both within the predetermined range, and the second side link resource is temporally after the i-th side link resource and before the i+3-th side link resource; 12. The method of claim 11, wherein a condition is satisfied: if a time interval between the first sidelink resource and the (i+3)th sidelink resource is within a predetermined range, time intervals between the second sidelink resource and the first and the (i)th sidelink resource are both within the predetermined range, and the second sidelink resource is temporally after the (i)th sidelink resource and before the (i+3)th sidelink resource. (Appendix 13) The maximum number N of resources that can be indicated in the sidelink control information max is 3, and the sidelink resources not included in the reselection candidate resource set are the N1-1th and N1th sidelink resources; a first side link resource of the two reselected side link resources satisfies a condition that a time interval between the first side link resource and at least one of the i-th side link resource to the N1-2-th side link resource is within a predetermined range, and the first side link resource and any of the i-th side link resource to the N1-2-th side link resource are not in the same slot; 13. The method according to any of claims 10 to 12, wherein a second of the two reselected sidelink resources satisfies a condition that a time interval between the second sidelink resource and at least one of the i-th sidelink resource through the N1-2-th sidelink resource and the first sidelink resource is within a predetermined range, and the second sidelink resource is not in a same slot as any of the i-th sidelink resource through the N1-2-th sidelink resource and the first sidelink resource. (Appendix 14) The two reselected sidelink resources are: 14. The method according to any of claims 10 to 13, further comprising the following condition: the two reselected sidelink resources and any of the 1st to N1th sidelink resources are not fed back by a Physical Sidelink Feedback Channel (PSFCH) in the same slot and the slot in which they are located is not within a certain period (i.e. processing time) after the slot in which the PSFCH corresponding to any of the reselected sidelink resources is located. (Appendix 15) 15. The method according to any of claims 2 to 14, wherein resource reselection is performed for one or more sidelink resources not in the reselection candidate resource set and for the subsequent sidelink resources one by one. (Appendix 16) 16. The method of claim 15, wherein a sidelink resource in the same slot as a physical sidelink control channel (PSCCH) of the sidelink control information is selected as a sidelink resource in a first round of resource reselection. (Appendix 17) 17. The method of claim 16, wherein if other sidelink resources are reserved in the sidelink control information, no reselection is performed for the other sidelink resources, and the other sidelink resources are selected as the sidelink resources selected for a second time in the resource reselection. (Appendix 18) 16. The method of claim 15, wherein if other sidelink resources are reserved in the sidelink control information, no reselection is performed for the other sidelink resources, and the other sidelink resources are selected as the sidelink resources in a first round of resource reselection. (Appendix 19) 19. The method of claim 18, wherein a sidelink resource in the same slot as a physical sidelink control channel (PSCCH) of the sidelink control information is selected as the sidelink resource selected in a second round of resource reselection. (Appendix 20) performing resource reselection one by one for one or more sidelink resources not in the reselection candidate resource set and subsequent sidelink resources, 20. The method according to any of claims 15 to 19, wherein if the number of reselected resources is n, selecting an n+1-th sidelink resource, where 1≦n≦N-1, N is the number of sidelink resources in the initially selected plurality of sidelink resources in the same slot as the sidelink control information and subsequent resources selected in an initial resource selection process. (Appendix 21) forming a first set by excluding the first n sidelink resources and a sidelink resource in the same slot as the nth sidelink resource from the sidelink resource set; a second set of sidelink resources in the sidelink resource set, the second set being determined to include at least one sidelink resource among the first n selected sidelink resources, the second set being determined to include at least one sidelink resource in ... 21. The method of claim 20, wherein the n+1-th sidelink resource is selected randomly with equal probability from the intersection of the first set and the second set. (Appendix 22) 22. The method of claim 21, further comprising forming the first set by excluding from the sidelink resource set the n-th sidelink resource, the sidelink resources in the same slot as the n-th sidelink resource, the sidelink resources in the same slot as a Physical Sidelink Feedback Channel (PSFCH) corresponding to the n-th sidelink resource, and the sidelink resources within a certain time period after the PSFCH, if retransmission based on Hybrid Automatic Repeat Request (HARQ) feedback is enabled. (Appendix 23) 23. The method of claim 21 or 22, further comprising the step of reordering the selected sidelink resources according to time if N sidelink resources have been selected or if the intersection of the first set and the second set is empty. (Appendix 24) 2. The method of claim 1, wherein the preemption detection is performed for the initially selected j-th sidelink resource and subsequent sidelink resources and wherein it is determined that one or more sidelink resources of the sidelink control information are not in a reselection candidate resource set, where j is an integer. (Appendix 25) 25. The method of claim 24, wherein resource reselection is performed for the one or more sidelink resources that are not in a reselection candidate resource set. (Appendix 26) The maximum number N of resources that can be indicated in the sidelink control information max if the side link resource not included in the reselection candidate resource set is the j-th side link resource, reselect the j-th side link resource; 26. The method of claim 25, further comprising reselecting sidelink resources from a sidelink resource set based on time-frequency resources of the j+1th sidelink resource to the N1th sidelink resource, where 1≦j≦N1-1, N1 being the number of the initially selected sidelink resources. (Appendix 27) The reselected sidelink resources include: 27. The method of claim 26, wherein a time interval between the selected sidelink resource and at least one of the (j+1)th to (N1)th sidelink resources is within a predetermined range, and the selected sidelink resource and any of the (j+1)th to (N1)th sidelink resources are not in a same slot. (Appendix 28) The reselected sidelink resources include: 28. The method of claim 27, further comprising the step of: determining whether the reselected sidelink resource and any of the 1st to N1th sidelink resources are fed back by a physical sidelink feedback channel (PSFCH) in a same slot and whether the slot in which the reselected sidelink resource is located is within a certain period (i.e., processing time) after the slot in which the physical sidelink feedback channel corresponding to the reselected sidelink resource is located. (Appendix 29) The maximum number N of resources that can be indicated in the sidelink control information max is 3, 29. The method according to any of claims 26 to 28, wherein the reselected sidelink resource satisfies the following condition: it is after another sidelink resource indicated by the same sidelink control information, the other sidelink resource being in the reselection candidate resource set and after a slot of the sidelink control information. (Appendix 30) The maximum number N of resources that can be indicated in the sidelink control information max If the sidelink resources not included in the reselection candidate resource set are the jth and j+1th sidelink resources, reselect the jth and j+1th sidelink resources; 26. The method of claim 25, further comprising reselecting two sidelink resources from a sidelink resource set based on time-frequency resources of the (j+2)th sidelink resource to the (N1)th sidelink resource, where 1≦j≦N1-2, N1 being the number of the initially selected sidelink resources. (Appendix 31) The first of the two reselected sidelink resources is 31. The method of claim 30, wherein a time interval between the first sidelink resource and at least one of the (j+2)th to (N1)th sidelink resources is within a predetermined range, and the first sidelink resource and any of the (j+2)th to (N1)th sidelink resources are not in a same slot. (Appendix 32) The second of the two sidelink resources to be reselected is 32. The method of claim 31, wherein a time interval between the second sidelink resource and at least one of the (j+2)th to (N1)th sidelink resource and the first sidelink resource is within the predetermined range, and the second sidelink resource is not in a same slot with any of the (j+2)th to (N1)th sidelink resource and the first sidelink resource. (Appendix 33) The two reselected sidelink resources are: 33. The method according to any of claims 30 to 32, further comprising the following condition: the two reselected sidelink resources and any of the 1st to N1th sidelink resources are not fed back by a physical sidelink feedback channel (PSFCH) in the same slot and the slot in which they are located is not within a certain period (i.e. processing time) after the slot in which the physical sidelink feedback channel corresponding to any of the reselected sidelink resources is located. (Appendix 34) 34. The method of any of claims 25 to 33, wherein resource reselection is performed for one or more sidelink resources not in the reselection candidate resource set and for the subsequent sidelink resources one by one. (Appendix 35) 35. The method of claim 34, wherein if other sidelink resources are reserved in the sidelink control information, the other sidelink resources are the sidelink resources selected in a first round of resource reselection, and the resources for the resource reselection are after the other sidelink resources. (Appendix 36) performing resource reselection one by one for one or more sidelink resources not in the reselection candidate resource set and subsequent sidelink resources, selecting an m+1-th sidelink resource if the number of reselected resources is m, where 1≦m≦M−1, M being the number of resources after the sidelink resource in the same slot as the sidelink control information among the initially selected sidelink resources. (Appendix 37) forming a first set by excluding the first m sidelink resources and a sidelink resource in the same slot as the mth sidelink resource from the sidelink resource set; a second set of sidelink resources in the sidelink resource set, the second set being determined to include at least one sidelink resource among the first m selected sidelink resources, the second set being determined to include at least one sidelink resource in ... 37. The method of claim 36, wherein the (m+1)-th sidelink resource is selected randomly with equal probability from the intersection of the first set and the second set. (Appendix 38) 38. The method of claim 37, further comprising forming the first set by excluding from the sidelink resource set the n-th sidelink resource, the sidelink resources in the same slot as the n-th sidelink resource, the sidelink resources in the same slot as a Physical Sidelink Feedback Channel (PSFCH) corresponding to the n-th sidelink resource, and the sidelink resources within a certain time period after the PSFCH, if retransmission based on Hybrid Automatic Repeat Request (HARQ) feedback is enabled. (Appendix 39) 39. The method of claim 37 or 38, further comprising the step of reordering the selected sidelink resources according to time if M sidelink resources have been selected or if the intersection of the first set and the second set is empty. (Appendix 40) 40. The method according to any of claims 1 to 39, wherein a time interval between the reselected sidelink resource and a slot in which a Physical Sidelink Control Channel (PSCCH) of the sidelink control information is located is equal to or greater than a predetermined value (T3). (Appendix 41) 41. The method according to any of claims 1 to 40, further comprising disabling retransmission based on Hybrid Automatic Repeat Request (HARQ) feedback for a reselected sidelink resource for which HARQ feedback is enabled, if the reselected sidelink resource is fed back via a Physical Sidelink Feedback Channel (PSFCH) in the same slot as any of the selected resources or if the reselected sidelink resource is within a decoding period of a Physical Sidelink Feedback Channel corresponding to any of the selected resources. (Appendix 42) 42. 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 41. (Appendix 43) A communication system including a terminal device, performing resource re-evaluation and / or preemption detection for initially selected sidelink resources for multiple transmissions of the transport block, and reselecting at least one sidelink resource from a sidelink resource set if one or more sidelink resources are not in a reselection candidate resource set; determining a currently reselected sidelink resource set based on time-frequency resources of the initially selected sidelink resources.

Claims

1. a processor for performing resource re-evaluation and / or preemption detection on first sidelink resources selected for multiple transmissions of a transport block; a reselector for reselecting one or more sidelink resources from a sidelink resource set if the one or more sidelink resources are not in a reselection candidate resource set, a second sidelink resource included in the one or more sidelink resources for transmitting the transport block multiple times after the reselection by the reselector, the second sidelink resource being located a certain period after a slot in which a physical sidelink feedback channel corresponding to a third sidelink resource included in the plurality of sidelink resources is located.

2. The apparatus of claim 1 , wherein the second sidelink resource is indicated by sidelink control information.

3. The apparatus of claim 2 , wherein the sidelink resource reselection is performed by selecting a sidelink resource in a first time slot of a physical sidelink control channel of the sidelink control information.

4. 4. The device of claim 3, wherein if another sidelink resource is reserved in the sidelink control information, reselection is not performed for the other sidelink resource, and the other sidelink resource is selected as the sidelink resource selected in a second round of resource reselection.

5. the processing unit performs the resource re-evaluation at a time point prior to an initially selected i-th sidelink resource and determines that one or more sidelink resources of the sidelink control information are not in a reselection candidate resource set, where i is an integer; The apparatus of claim 1 , wherein the reselector is configured to perform resource reselection for the one or more sidelink resources that are not in a reselection candidate resource set.

6. The maximum number N of resources that can be indicated in the sidelink control information ｍａｘ if t is 2 or 3 and the sidelink resource not included in the reselection candidate resource set is the i+1th or i+2th sidelink resource, reselect the i+1th or i+2nd sidelink resource; i-th sidelink resource and i+2-th sidelink resource to N １ reselecting sidelink resources from the sidelink resource set based on the time-frequency resource of the i-th sidelink resource, where 1≦i≦N １ -2, N １ 6. The apparatus of claim 5, wherein: x is a number of the initially selected plurality of sidelink resources.

7. 7. The apparatus of claim 6, wherein the reselected sidelink resource further satisfies a condition that the reselected sidelink resource is after a sidelink resource in the same slot as a physical sidelink control channel of the sidelink control information.

8. the processing unit performs the preemption detection for an initially selected jth sidelink resource (j being an integer) and subsequent sidelink resources and determines that one or more sidelink resources of the sidelink control information are not in a reselection candidate resource set; The apparatus of claim 1 , wherein the reselector is configured to perform resource reselection for the one or more sidelink resources that are not in a reselection candidate resource set.

9. The maximum number N of resources that can be indicated in the sidelink control information ｍａｘ if t is 2 or 3 and the side link resource not in the reselection candidate resource set is the j-th side link resource, reselect the j-th side link resource; j+1th sidelink resource to N １ reselecting sidelink resources from the sidelink resource set based on a time-frequency resource of the th sidelink resource, where 1≦j≦N １ -1, N １ 9. The apparatus of claim 8, wherein: x is a number of the initially selected plurality of sidelink resources.

10. 2. The apparatus of claim 1, wherein the second sidelink resource is located after a slot in which the third sidelink resource is not fed back by a physical sidelink feedback channel (PSFCH) in the same slot and the second sidelink resource is located after the certain period following the slot in which the physical sidelink feedback channel (PSFCH) corresponding to the third sidelink resource is located.

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