Method and device for determining to-be-sensed resources for device-to-device communication in a wireless communication system

Abstract

This disclosure relates to a method and apparatus for determining resources to be sensed for device-to-device (D2D) communication in a wireless communication system. According to one aspect of this disclosure, a method for performing sensing for device-to-device (D2D) communication in a wireless communication system may include: receiving sidelink control information (SCI) by a first user equipment (UE) in time slot m; determining a first exclusion candidate based on a received power measurement of a data channel corresponding to the SCI; determining a time slot m+Gap that transmits the same data in time slot m; determining a second exclusion candidate based on the time slot m+Gap; excluding resources from the resources to be sensed where the first and second exclusion candidates overlap with the resources to be sensed; and sensing the resources to be sensed.

Description

Technical Field

[0001] This disclosure relates to device-to-device (D2D) communication in wireless communication systems, and more specifically, to methods and apparatus for determining resources to be sensed for D2D communication. Background Technology

[0002] Device-to-device (D2D) communication refers to a single user equipment (UE) communicating directly with another UE. Direct communication means that a single UE communicates with another UE under the control of the network or through its own determination without using another network device.

[0003] The D2D communication described herein can be applied to vehicle communication, often referred to as Vehicle-to-Everything (V2X) communication. This V2X communication can include communication methods that exchange or share information about road infrastructure and traffic conditions with other vehicles during driving. V2X-based services can include, for example, autonomous driving services, remote vehicle control services, interactive services such as gaming, and high-capacity short-range audio / video services such as augmented reality (AR) and virtual reality (VR). Based on the performance requirements for supporting various V2X-based services through 5G systems, detailed technologies additionally required for Long Term Evolution (LTE) and New Radio (NR) systems as Radio Access Technologies (RATs) in 5G systems are being discussed.

[0004] When applying D2D communication for V2X in an NR system, a resource allocation mode based on UE sensing can be applied when selecting resources for the D2D communication. UE sensing can include full sensing methods and partial sensing methods for specific resources. To meet the requirements of an NR system, the settings for UE sensing and UE operation need to be determined. However, no detailed solution has been provided to date. Summary of the Invention

[0005] Technical topics

[0006] The technical objective of this disclosure is to provide a partial sensing method and apparatus for device-to-device (D2D) communication in a wireless communication system.

[0007] Another technical objective of this disclosure is to provide a partial sensing method and apparatus for selecting resources for sidelink data transmission and reception in a new radio (NR) system.

[0008] Another technical objective of this disclosure is to provide a method and apparatus for efficiently indicating or configuring resources used in an NR side link based on partial sensing.

[0009] Another technical objective of this disclosure is to provide a method and apparatus for excluding resources from the sensing process in an NR side link.

[0010] The technical objectives achievable from this disclosure are not limited to those described above, and other technical objectives not described herein will be readily understood by those skilled in the art to which this disclosure pertains, based on the following description.

[0011] Technical solution

[0012] According to one aspect of this disclosure, a method for performing sensing for device-to-device (D2D) communication in a wireless communication system may include: receiving sidelink control information (SCI) by a first user equipment (UE) in time slot m; determining a first exclusion candidate based on a received power measurement of a data channel corresponding to the SCI; determining a time slot m+Gap that transmits the same data in time slot m; determining a second exclusion candidate based on the time slot m+Gap; excluding resources from the resources to be sensed where the first and second exclusion candidates overlap with the candidates to be sensed; and sensing the resources to be sensed.

[0013] The features briefly described above regarding this disclosure are merely examples of aspects that are described in detail below and do not limit the scope of this disclosure.

[0014] Technical effect

[0015] According to this disclosure, a partial sensing method and apparatus for device-to-device (D2D) communication in a wireless communication system may be provided.

[0016] According to this disclosure, a partial sensing method and apparatus for selecting resources for sidelink data transmission and reception in a new radio (NR) system can be provided.

[0017] According to this disclosure, a method and apparatus may be provided for efficiently indicating or configuring resources used in a new radio (NR) side link based on partial sensing.

[0018] According to this disclosure, a method and apparatus for excluding resources from the sensing process in an NR side link can be provided.

[0019] The effects achievable from this disclosure are not limited to those described above, and other effects not described herein will be readily understood by those skilled in the art to which this disclosure pertains, based on the following description. Attached Figure Description

[0020] Figures 1 to 3 Examples of vehicle-to-everything (V2X) scenarios to which this disclosure can be applied are shown.

[0021] Figure 4An example of a service provided based on a sidelink is shown, and this disclosure can be applied to that sidelink.

[0022] Figure 5 An example of a new radio (NR) frame structure to which this disclosure can be applied is shown.

[0023] Figure 6 The NR resource structure to which this disclosure can be applied is shown.

[0024] Figure 7 and 8 An example of a V2X resource pool configuration to which this disclosure can be applied is shown.

[0025] Figure 9 An example of a sidelink transmission time slot determination method based on user equipment (UE) sensing, to which this disclosure can be applied is shown.

[0026] Figure 10 This illustrates a V2X resource allocation method to which this disclosure can be applied.

[0027] Figure 11 This illustrates how the present disclosure can be applied to fully sensing-based resource selection and resource pool configuration.

[0028] Figure 12 This illustrates how the present disclosure can be applied to partially sensing-based resource selection and resource pool configuration.

[0029] Figure 13 An example of a resource selection method based on partial sensing that this disclosure can be applied to is shown.

[0030] Figure 14 Additional examples of resource selection methods based on partial sensing to which this disclosure can be applied are shown.

[0031] Figure 15 Additional examples of resource selection methods based on partial sensing to which this disclosure can be applied are shown.

[0032] Figure 16 An example of a partial sensing resource pool configuration to which this disclosure can be applied is shown.

[0033] Figure 17 This is a flowchart illustrating a resource selection method based on partial sensing to which this disclosure can be applied.

[0034] Figure 18 This is a diagram illustrating the configuration of the first terminal device and the second terminal according to this disclosure.

[0035] Figure 19 This illustrates a retransmission method to which this disclosure can be applied.

[0036] Figure 20 An example of a resource exclusion process to which this disclosure can be applied is shown.

[0037] Figure 21 Additional examples of resource exclusion processes to which this disclosure can be applied are shown.

[0038] Figure 22 Additional examples of resource exclusion processes to which this disclosure can be applied are shown.

[0039] Figure 23 This illustrates the resource exclusion operations to which this disclosure can be applied.

[0040] Figure 24 This is a diagram illustrating a detailed configuration of a first terminal device to which this disclosure can be applied.

[0041] The best way to implement an invention

[0042] Various examples of this disclosure will be described more fully below with reference to the accompanying drawings, enabling those skilled in the art to readily implement these examples. However, this disclosure can be implemented in various forms and is not limited to the examples described herein.

[0043] When a detailed description is determined to relate to a known configuration or function in the examples describing this disclosure, that detailed description is omitted. Furthermore, portions unrelated to the description of this disclosure are omitted, and the same reference numerals denote the same elements.

[0044] It will be understood that when an element is described as being "connected to," "coupled to," or "accessed" to another element, it may be directly connected, coupled to, or accessed to the other element, or there may be an intermediate element present. Furthermore, it will be understood that when an element is described as "including / contains" or "has" another element, it specifies the presence of yet another element, but does not preclude the presence of another element unless otherwise described.

[0045] Furthermore, terms such as first, second, etc., may be used herein to describe elements in this description. These terms are used to distinguish one element from another. Therefore, the terms do not limit elements, arrangement order, or sequence, etc. Thus, a first element in one example may be referred to as a second element in another example. Similarly, a second element in one example may be referred to as a first element in another example.

[0046] The distinguishing elements are provided herein merely for clarity of explanation of the various features, and do not imply that these elements must be separate from each other. That is, multiple elements can be integrated into a single hardware or software unit. Furthermore, a single element can be distributed across multiple hardware or software units. Therefore, unless specifically described, examples of integration or distribution are also included within the scope of this disclosure.

[0047] The elements described in the various examples may not be required and may be partially optional. Therefore, examples that include a partial set of the elements described in the examples are also included within the scope of this disclosure. Furthermore, examples that additionally include elements other than those described in the various examples are also included within the scope of this disclosure.

[0048] The terminology used in this disclosure is intended to describe particular examples and not to limit the scope of the claims. As used in the description of the examples and in the appended claims, the singular form is also intended to include multiple forms unless explicitly indicated differently in the context. Additionally, the term “and / or” as used herein may refer to one of the relevant enumerated items, or mean referring to and including at least two or more of any and all possible combinations thereof.

[0049] The description herein relates to a wireless communication network, and the operations performed in the wireless communication network may be performed in the process of controlling the network and transmitting data in a system (e.g., a base station) that controls the wireless communication network, or may be performed in the process of transmitting or receiving signals in a user device connected to the wireless communication network.

[0050] Clearly, in a network comprising base stations and multiple network nodes, various operations performed for communicating with a terminal can be performed by the base station or other network nodes besides the base station. Here, the term "base station (BS)" is used interchangeably with other terms, such as fixed station, node B, eNodeB (eNB), and access point (AP). Furthermore, the term "terminal" is used interchangeably with other terms, such as user equipment (UE), mobile station (MS), mobile subscriber station (MSS), subscriber station (SS), and non-AP station (non-AP STA).

[0051] Here, "transmit or receive channel" includes the meaning of sending or receiving information or signals through the corresponding channel. For example, "transmit control channel" means sending control information or signals through a control channel. Similarly, "transmit data channel" means sending data information or signals through a data channel.

[0052] The abbreviations used in this article are defined as follows:

[0053] D2D: Device to Device (communication)

[0054] DCI: Downlink Control Information

[0055] V2X: Vehicle to X (everything)

[0056] V2V: Vehicle to Vehicle

[0057] V2P: Vehicle to Pedestrian

[0058] V2I / N: Vehicle to Infrastructure / Network

[0059] SL: Sidelink

[0060] SCI: Sidelink Control Information

[0061] SFCI: Sidelink Feedback Control Information

[0062] PSSCH: Physical Side Link Shared Channel

[0063] PSBCH: Physical Sidelink Broadcast Channel

[0064] PSCCH: Physical Side Link Control Channel

[0065] PSDCH: Physical Sidelink Discovery Channel

[0066] PSFICH: Physical Side Link Feedback Indicator Channel

[0067] ProSe: (Device-to-device) Proximity Service

[0068] SLSS: Side Link Synchronization Signal

[0069] PSSID: Physical Side Link Synchronization Identifier

[0070] n SA ID Sidelink group destination identifier

[0071] N SL ID Physical link synchronization identifier

[0072] SA: Scheduling Assignment

[0073] TB: Transport Block

[0074] TTI: Transmission Time Interval

[0075] RB: Resource Block

[0076] In the following description, although the term "new radio (NR) system" is used to distinguish the various examples of systems according to this disclosure from existing systems, the scope of this disclosure is not limited thereto.

[0077] For example, new radio (NR) systems support various subcarrier spacings (SCS) by considering diverse scenarios, service requirements, and potential system compatibility. Furthermore, to overcome adverse channel conditions such as high path loss, phase noise, and frequency offset at high carrier frequencies, NR systems can support the transmission of physical signals / channels through multiple beams. In this way, NR systems can support a variety of applications, such as enhanced mobile broadband (eMBB), massive machine-type communication (mMTC) / ultra-machine-type communication (uMTC), and ultra-reliable and low-latency communication (URLLC). Here, the term "NR system" is used as an example of a wireless communication system, and the term "NR system" itself is not limited to the features described above.

[0078] Furthermore, for example, 5G mobile communication technology can be defined. Here, 5G mobile communication technology can be defined by including existing LTE-A systems as well as the aforementioned NR systems. That is, 5G mobile communication technology can operate by taking into account backward compatibility with previous systems and the newly defined NR systems.

[0079] For example, the 5G sidelink domain can include all of the sidelink technologies in LTE systems and NR systems. Here, the sidelink domain may be necessary for enhancing performance through ultra-high reliability and ultra-low latency, as well as for integrating new and various services.

[0080] In the following description, for clarity, the operation and related information for vehicle-to-all-things (V2X) communication will be described based on the NR system. Here, the following features are not limited to a specific system and can be applied equally to other systems with similar configurations. However, they are provided merely as examples and the invention is not limited thereto.

[0081] Meanwhile, V2X communication can be vehicle-based. Here, the concept of a vehicle is evolving from a simple transportation device to a new platform. For example, information technology (IT) is applied to vehicles, and various V2X services are provided accordingly. These include services such as preventing traffic accidents, improving the traffic environment, autonomous driving, and remote driving. Therefore, the demand for developing and applying sidelink-related technologies is growing.

[0082] In detail, regarding existing communication technologies, communication from an evolved NodeB (eNodeB) to a User Equipment (UE) can be a downlink, and communication from a UE to an eNodeB can be an uplink. Here, in addition to communication between the eNodeB and the UE, communication between UEs is also required. Communication from one UE to another can be the aforementioned sidelink. For example, regarding the aforementioned V2X communication, vehicle-to-vehicle (V2V) communication or communication between a vehicle and another object (e.g., an object other than the eNodeB, such as a pedestrian UE, a UE-type roadside unit (RSU), etc.) can be a sidelink. That is, in the case of performing vehicle-based communication, there are some constraints of using only communication with the eNodeB. Therefore, the aforementioned sidelink technology can be developed and applied.

[0083] Figures 1 to 3 This illustrates a V2X scenario to which this disclosure can be applied.

[0084] Figure 1 This could be a scenario where communication is performed based on the aforementioned side link. Figure 2 This could be a scenario where V2X operations are performed using communication between the UE (or vehicle) and the eNodeB. Figure 3 This could be a scenario where communication is performed using all the aforementioned side links and by communicating with the eNodeB.

[0085] For example, in descriptions related to V2X, a UE can be a vehicle. In descriptions related to V2X, UE and vehicle are collectively referred to as UE. For example, a UE can refer to a device capable of performing communication with sidelinks and base stations, and can include vehicles used for V2X.

[0086] In addition, regarding V2X, D2D (device-to-device) can refer to communication between UEs.

[0087] Furthermore, the term "Proximity-Based Service (ProSe)" can indicate proximity service for a UE performing D2D communication. Additionally, SL (Sidelink) can be the aforementioned sidelink, and Sidelink Control Information (SCI) can indicate control information related to the aforementioned sidelink. Furthermore, the Physical Sidelink Shared Channel (PSSCH) can be a channel used to transmit data via the sidelink, and the Physical Sidelink Control Channel (PSCCH) can be a channel used to transmit control information via the sidelink. Furthermore, the Physical Sidelink Broadcast Channel (PSBCH) can be a channel used to broadcast signals and forward system information via the sidelink. Furthermore, the Physical Sidelink Feedback Indication Channel (PSFICH) can be a channel used as a sidelink feedback channel to guide feedback information. Furthermore, the Sidelink Synchronization Signal (SLSS) can be a synchronization signal used for sidelink synchronization, and the Physical Sidelink Synchronization Identifier (PSSID) can be ID information used for sidelink synchronization.

[0088] In addition, n SA ID (Sidelink group destination identifier) ​​can be ID information used to identify the sidelink group, and N SL ID (Physical Sidelink Synchronization Identifier) ​​can be ID information used for the aforementioned sidelink synchronization. V2V can represent vehicle-to-vehicle communication, V2P can represent vehicle-to-pedestrian communication, and V2I / N can represent vehicle-to-infrastructure / network communication. The terms SA, TB, TI, and RB can be the same terms used in existing LTE. For example, in V2X communication, control information sent from one UE to another UE can be a scheduling assignment (SA). If the aforementioned control information is used for sidelink communication, then the control information can be an SCI. Here, the SCI can be sent via PSCCH. Furthermore, a portion of the SCI can be sent via PSCCH, while another portion can be sent via PSSCH.

[0089] In V2X communication, data sent from one UE to another can be configured in units of transport blocks (TB). Here, sidelink data can be sent via PSSCH.

[0090] Next, here, the operating mode can be defined based on the resource allocation method used to send data and control information for V2X communication or direct link (e.g., D2D, ProSe, or SL) communication.

[0091] For example, an eNodeB resource scheduling mode can be a mode in which the eNodeB or relay node schedules resources for the UE to transmit V2X (or direct link) control information and / or data. In this way, the UE can transmit V2X (or direct link) control information and / or data. This mode can be called an eNodeB resource scheduling mode.

[0092] For a more detailed example, the eNodeB or relay node can provide scheduling information about resources used for transmitting sidelink (or direct link) control information and / or data to the transmitting UE via downlink control information (DCI). Therefore, the transmitting UE can transmit the sidelink (or direct link) control information and data to the receiving UE, and the receiving UE can receive the sidelink (or direct link) data based on the sidelink (or direct link) control information.

[0093] Furthermore, the UE autonomous resource selection mode can be a resource allocation mode in which the UE autonomously selects the resource allocation mode for transmitting control information and data. The UE's resource selection can be determined by the UE sensing from the resource pool (i.e., the resource candidate set). On the selected resources, the UE can transmit V2X (or direct link) control information and / or data.

[0094] For a more detailed example, a sidelink (or direct link) transmitting UE can use its selected resources to send sidelink (or direct link) receiving UE to sidelink (or direct link) receiving UE, and a sidelink (or direct link) receiving UE can receive sidelink (or direct link) data based on the sidelink (or direct link) control information.

[0095] The eNodeB resource scheduling mode described above can be referred to as Mode 1 in sidelink (or direct link) communication such as D2D. Furthermore, in sidelink communication such as V2X, the eNodeB resource scheduling mode can be referred to as Mode 3. Furthermore, the UE autonomous resource selection mode can be referred to as Mode 2 in sidelink (or direct link) communication such as D2D. Furthermore, the UE autonomous resource selection mode can be referred to as Mode 4 in sidelink communication such as V2X. However, these are provided only as examples, and this disclosure is not limited thereto. That is, they can be considered as the same modes regarding the same objectives and the same operations.

[0096] For example, in NRV2X, the eNodeB resource scheduling mode can be referred to as Mode 1, and the UE autonomous resource selection mode can be referred to as Mode 2.

[0097] Although the following description is based on V2X communication for clarity, it is not limited thereto. For example, this disclosure can also be applied to communication based on direct links such as D2D, ProSe, etc. Similarly, for example, V2X can be a general term for V2V, V2P, and V2I / N. Here, each of V2V, V2P, and V2I / N may be defined in Table 1 below; however, it is not limited thereto. That is, Table 1 below is provided only as an example and is not a limitation.

[0098] [Table 1]

[0099]

[0100] Furthermore, V2X communication can include PC5-based communication, which is an interface for sidelink communication.

[0101] For example, Table 2 below and Figure 1 This can be applied to scenarios that support V2X operations based on the PC5 interface (or SL). Here, Figure 1 (a) shows an example of V2V operation, (b) Figure 1 An example of V2I operation is shown, and Figure 1 (c) shows an example of V2P operation. That is, Figure 1 A method for performing communication based on the side link (SL) is shown. Here, communication can be performed without an eNodeB.

[0102] [Table 2]

[0103]

[0104] Meanwhile, Table 3 below and Figure 2 This can refer to scenarios that support V2X operations based on the Uu interface (i.e., the interface between the UE and the eNodeB). Here, Figure 2 (a) shows an example of V2V operation. Figure 2 (b) shows an example of V2I operation, and Figure 2 (c) shows an example of V2P operation. That is, V2X operation can be supported using communication between the UE and the eNodeB.

[0105] [Table 3]

[0106]

[0107] Table 4 below and Figure 3 This can involve scenarios that support V2X operation using all UE interfaces and the PC5 interface (or SL). Here, Figure 3 (a) shows scenario 3A in Table 4. Figure 3 (b) shows scenario 3B of Table 4.

[0108] For details, please refer to Figure 3 (a) A UE can send V2X messages to other UEs via a sidelink. One of the UEs that receives the V2X message can transmit the V2X message to the eNodeB via the uplink (UL). The eNodeB can receive the V2X message and can send messages based on the V2X message to other neighboring UEs via the downlink (DL). Here, for example, a broadcast method can be used to perform downlink transmission.

[0109] See Figure 3 (b) The UE can transmit V2X messages to the eNodeB via the uplink (UL), and the eNodeB can transmit the V2X messages to at least one UE or RSU. In response, the UE or RSU can send the received messages to multiple neighboring UEs via the sidelink (SL).

[0110] exist Figure 3 In (a) and (b), all communication between the eNodeB and the UE, as well as the side link, can be used to support V2X operation.

[0111] [Table 4]

[0112]

[0113] As described above, V2X communication can be performed via eNodeB and through direct communication between UEs. Here, if an eNodeB is used, transmission and reception can be performed via a Uu link, which is the communication interface between the LTE eNodeB and UE in LTE-based V2X communication. Furthermore, if a sidelink is used for direct communication between UEs, transmission and reception can be performed via a PC5 link, which is the communication interface between LTE UEs in LTE-based V2X communication. For example, even in an NR system, V2X communication can be performed using communication between the UE and eNodeB, as well as sidelinks between UEs. Here, there may be differences between the communication (uplink / downlink) methods between the eNodeB and UE in an NR system. For example, the communication methods may be similar in some characteristics, and there may be some changes based on the NR system as a new system. Furthermore, for example, there may be differences between the sidelinks in an NR system and those in existing systems. That is, considering the aforementioned differences in communication between the eNodeB and UE, there may be some changes in the sidelinks of the NR system as a new system.

[0114] Figure 4 An example of a service provided based on a sidelink is shown, and this disclosure can be applied to that sidelink.

[0115] refer to Figure 4 V2X-related services or Internet of Things (IoT) services can be provided based on 5G sidelinks. Here, for example, a 5G sidelink can be a concept that includes both sidelinks based on existing LTE systems and sidelinks based on NR systems. That is, a 5G sidelink can be a service provided by taking into account the sidelinks used in each system.

[0116] For example, refer to Figure 4 For V2X services, vehicle platooning, autonomous driving, advanced sensors, and remote driving services can be provided. Here, vehicle platooning can refer to a technology that allows multiple vehicles to dynamically form a group and operate in a similar manner. Furthermore, autonomous driving can refer to technologies that drive vehicles based on full automation and semi-automation. Furthermore, advanced sensors can refer to technologies that collect and exchange data acquired from sensors or video images. Furthermore, remote driving can refer to technologies for remotely controlling vehicles and technologies used in applications. That is, the above services can be provided as V2X-based services. Here, the services are provided only as examples, and this disclosure is not limited thereto. Here, requirements such as ultra-high latency, ultra-high connectivity, low power consumption, and high reliability may be required to provide V2X services. Therefore, the 5G sidelink may require an operational method to meet the service and its requirements. Detailed methods taking these requirements into account are described below.

[0117] The physical resource structure of the NR system is described below.

[0118] Figure 5 An example of a frame structure for an NR system to which the present invention can be applied is shown.

[0119] In NR, the basic unit of time domain can be T. c =1 / (Δf) max ·N f Here, Δf max =480·10 3 And N f =4096. In LTE, T s =1 / (Δf) ref ·N f,ref ), Δf ref =15·10 3 Hz, and N f,ref =2048 can be defined as a reference time unit. The constant of the multiple relationship between the NR reference time unit and the LTE reference time unit can be defined as κ = T s / T c =64.

[0120] Reference Figure 5The time structure of frames used for downlink / uplink (DL / UL) transmission may include T f =(Δf mas N f / 100)·T s =10ms. Here, a single frame can include the frame corresponding to T. sf =(Δf mas N f / 1000)·T s = 10 subframes of 1ms. The number of consecutive OFDM symbols in each subframe can be... Furthermore, each frame can be divided into two half-frames, and each half-frame can include 0 to 4 subframes and 5 to 9 subframes. Here, half-frame 1 can include 0 to 4 subframes, and half-frame 2 can include 5 to 9 subframes.

[0121] refer to Figure 5 N TA The timing advance (TA) between the downlink (DL) and uplink (UL) is shown. Here, the transmission timing of the uplink transmission frame i is determined based on the downlink reception time at the UE, according to Equation 1 below.

[0122] [Equation 1]

[0123] T TA =(N TA +N TA，offset )T c

[0124] In equation 1, N TA,offset This indicates the TA offset due to differences in duplex modes, etc. Basically, in frequency division duplex (FDD), N... TA,offset =0. In Time Division Duplex (TDD), N TA,offset It can be defined as a fixed value by taking into account the margin of DL-UL switching time.

[0125] Figure 6 The NR resource structure to which this disclosure can be applied is shown.

[0126] Resource elements within a resource grid can be indexed based on each subcarrier interval. Here, a single resource grid can be generated for each antenna port and subcarrier interval. Uplink / downlink transmission and reception can be performed based on the corresponding resource grid.

[0127] A single resource block is configured in the frequency domain using 12 resource elements, and each set of 12 resource elements is configured with an index for the single resource block. The index of the resource block can be used in a specific frequency band or system bandwidth. The index of the resource block can be defined as shown in Equation 2, where N... RB scThis represents the number of subcarriers in each resource block, and k represents the subcarrier index.

[0128] [Equation 2]

[0129]

[0130] Numerologies can be configured differently to meet various services and requirements of NR systems. For example, multiple subcarrier spacings (SCS) can be supported, unlike existing LTE / LTE-A systems that support a single SCS.

[0131] New digital configurations of NR systems, including those supporting multiple SCS, can operate in frequency ranges or carriers such as 3 GHz or less, 3 GHz to 6 GHz, or 6 GHz to 52.6 GHz, to address the problem of not being able to obtain wide bandwidth in existing frequency ranges or carriers such as 700 MHz or 2 GHz. However, the scope of this disclosure is not limited thereto.

[0132] Table 5 below shows examples of digital configurations supported by the NR system.

[0133] [Table 5]

[0134] μ <![CDATA[Δf=2 u ·15[kHz]]]> Cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0135] Referring to Table 5, the digital configuration can be defined based on the SCS used in the OFDM system, the cyclic prefix (CP) length, and the number of OFDM symbols per time slot. These values ​​can be provided to the UE via the upper-layer parameters DL-BWP-mu and DL-BWP-cp (DL) and UL-BWP-mu and UL-BWP-cp (UL).

[0136] For example, referring to Table 5 below, if μ = 2 and SCS = 60kHz, both normal CP and extended CP can be applied. In other digital configuration indices, only normal CP can be applied.

[0137] A normal time slot can be defined as the basic time unit used to transmit a single data and control message in an NR system. The length of a normal time slot can generally comprise 14 OFDM symbols. Furthermore, unlike time slots, subframes can have an absolute time length corresponding to 1 ms in an NR system and can be used as a reference time for the length of another time segment. Here, for the coexistence and backward compatibility of LTE and NR systems, the NR standard may require time segments such as LTE subframes.

[0138] For example, in LTE, data can be transmitted based on a transmission time interval (TTI) as a unit of time. This TTI can include at least one subframe unit. Here, even in LTE, a single subframe can be set to 1 ms and can include 14 OFDM symbols (or 12 OFDM symbols).

[0139] Furthermore, in NR systems, non-time slots can be defined. A non-time slot can refer to a time slot with at least one fewer symbol than a normal time slot. For example, in providing low-latency services such as Ultra-Reliable and Low-Latency Communication (URLLC), latency can be reduced by using non-time slots with a smaller number of time slots than normal time slots. Here, the number of OFDM symbols included in the non-time slots can be determined based on the frequency range. For example, in the frequency range of 6 GHz or higher, a non-time slot with one OFDM symbol length can be considered. As another example, the multiple symbols used to define a non-time slot can include at least two OFDM symbols. Here, the range of the number of OFDM symbols included in the non-time slots can be configured to have a micro-time slot length of up to (normal time slot length) - 1. Here, although the number of OFDM symbols can be limited to 2, 4, or 7 as a non-time slot standard, it is only provided as an example.

[0140] Furthermore, for example, SCSs corresponding to μ=1 and 2 can be used in unlicensed frequency bands of 6 GHz or less, and SCSs corresponding to μ=3 and 4 can be used in unlicensed frequency bands above 6 GHz.

[0141] [Table 6]

[0142] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0143] Table 6 shows the number of OFDM symbols per slot under normal CP conditions, as provided in Table 6 for each SCS setting parameter μ. Number of time slots per frame and the number of time slots per subframe Here, in Table 6, these values ​​are based on a normal time slot with 14 OFDM symbols.

[0144] [Table 7]

[0145] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 2 12 40 4

[0146] Table 7 shows the number of OFDM symbols per time slot when extended CP (μ=2 and SCS=60kHz) can be applied. The normal time slots are 12, the number of time slots per frame, and the number of time slots per subframe. Furthermore, as mentioned above, a single subframe can correspond to 1 ms on the time axis. Moreover, a single time slot can correspond to 14 symbols on the time axis. Additionally, for example, a single time slot can correspond to 7 symbols on the time axis. Therefore, the number of time slots and symbols available within 10 ms corresponding to a single radio frame can be set differently. Table 8 shows the number of time slots and symbols according to each SCS. Here, for example, a 480 kHz SCS can be disregarded, and this disclosure is not limited thereto.

[0147] [Table 8]

[0148]

[0149] Figure 7 and 8 An example of a V2X resource pool configuration to which this disclosure can be applied is shown. References Figure 7 and 8 This describes a method for configuring resource pools in V2X for a control channel (PSCCH) (through which schedule assignments (SAs) are transmitted) and a data channel (PSSCH) (through which associated data is transmitted). Here, a resource pool can refer to a candidate set of resources available for SA and / or data transmission. Each resource pool can be referred to as a time slot pool in the time domain and as a resource block pool in the frequency domain. Here, as... Figure 7 and 8 The resource pool in the example could be a resource pool used for vehicle (V)-UE in V2X. Furthermore, Figure 7 and 8 The resource pool configuration method in the example is provided only as an example, and the resource pool can be configured using another method.

[0150] like Figure 7 and Figure 8 The resource pool in the example can be defined in the UE autonomous resource selection mode (or mode 2).

[0151] In eNodeB resource scheduling mode (or mode 1), all sidelink time slots in the time domain (e.g., corresponding to all uplink time slots in the NR) and resources corresponding to V2X carriers or all resource blocks (RBs) within a frequency band in the frequency domain can be a candidate set of resources available for transmitting SA and / or data. Furthermore, even in eNodeB resource scheduling mode (or mode 1), the candidate set of resources available for transmitting SA and / or data can be configured by defining resource pools separately, as in UE autonomous resource selection mode (or mode 2).

[0152] In other words, the resource scheduling can be defined based on the reference in the UE autonomous resource selection mode (or mode 2) and / or eNodeB resource scheduling mode (or mode 1). Figure 7 and 8 This describes the publicly disclosed resource pool.

[0153] The time slot pool, which corresponds to the resource pool in the time domain, will be described further below.

[0154] Figure 7 This shows the time slots for configuring resource pools in the time domain relative to the resource pool. (Reference) Figure 7 The time slots for a resource pool used in V2X can be defined by indicating the repetition of a bitmap for all time slots except a specific time slot. A time slot for a resource pool used in V2X can be a time slot in which the transmission and / or reception of SAs and / or data of the resource pool in V2X are permitted.

[0155] Here, time slots excluded from application bitmap repetition may include time slots used for transmitting sidelink signal blocks (SSBs), which include the primary sidelink synchronization signal (PSSS), the secondary sidelink synchronization signal (SSSS), and the physical sidelink broadcast channel (PSBCH). Furthermore, excluded time slots may also include downlink (DL) time slots or flexible time slots, rather than uplink (UL) time slots that can be used as sidelink (SL) time slots in a TTD. Here, the excluded time slots are not limited to the examples described above.

[0156] For example, excluded time slots within the System Frame Number (SNF) or D2D Frame Number (DFN) period may include non-uplink time slots and time slots used for the SSB. Furthermore, the excluded time slots may also include additional excluded d' time slots, allowing for the application of length L to be repeated in integer multiples within the SFN or DFN period. bitmap The bitmap. Here, the excluded time slots are not limited to the examples above.

[0157] In addition, upper-layer signaling such as RRC can be utilized. Figure 7 The signaling field "Slot Indication for Resource Pool" in the configuration file indicates the bitmap for repeated applications. The length of the signaling field can be 16, 20, or 100, but is not limited to these. If the bitmap value is 1, it can indicate a slot used for the resource pool. If the bitmap value is 0, it can indicate a slot not belonging to the resource pool. Here, Figure 7 The value of u can follow the values ​​defined in Tables 5 to 7, as a value based on the subcarrier spacing (SCS).

[0158] Next, we will further describe the resource block pool corresponding to the resource pool in the frequency domain.

[0159] Figure 8This shows the time slots for configuring resource pools in the frequency domain. (Refer to...) Figure 8 In the resource pool, the PSCCH for sending SA and the PSSCH for sending data can be sent simultaneously in a single sub-channel. Here, the PSSCH can be sent over the entire sub-channel, while the PSCCH can be sent over a portion of the sub-channel.

[0160] refer to Figure 8 In the time slot where resource pools are configured for V2X in the time domain, resource pools can be configured based on a single RB unit relative to all RBs (RB#0 to RB#(N)) in the frequency domain. UL RB -1)) to define "the starting RB of the sub-channel" (here, N) UL RB This represents the total number of RBs corresponding to the system bandwidth of the uplink (UL), and V2X for the sidelink is defined in the UL band. Therefore, SL can be used to replace UL (i.e., N can be applied). SL RB To replace N UL RB The signaling field "Starting RB of Subchannel" can be indicated via upper-layer signaling such as RRC. A series of consecutive RBs corresponding to the total number of K subchannels, starting from the RB indicated by "Starting RB of Subchannel", belong to the resource pool. Here, via upper-layer signaling such as RRC, the number of RBs constituting a single subchannel can be indicated via the signaling field "Subchannel Size", and the number of K subchannels can be indicated via the signaling field "Number of Subchannels".

[0161] For example, "subchannel size" N subchannel It can be 10, 15, 20, 25, 50, 75, or 100 RBs, but is not limited to these; 4, 5, or 6 RBs can also be used. Furthermore, refer to... Figure 8 The PSCCH of a SA allocated to a portion of a subchannel can be allocated to X RBs within that subchannel. Here, X ≤ N. subchannel .

[0162] Figure 9 An example of a UE-sensing-based sidelink transmission time slot determination method to which this disclosure can be applied is shown.

[0163] In UE autonomous resource selection mode (or mode 2), the UE can autonomously determine the time slots in which to transmit PSCCH for SA and PSSCH for data.

[0164] [Table 9]

[0165]

[0166] Figure 9A method for selecting time slots for the transmission control channel (PSCCH) and data channel (PSSCH) by sensing within a resource pool used for the PSCCH and its associated data channel (PSSCH) is illustrated. Within a sensing window corresponding to a duration from “TTI ma” to “TTI mb”, the UE can sense resources that have been occupied and used by another UE. Based on this, the UE can select resources from the remaining resources belonging to the resource pool, excluding those occupied and used by other terminals or to be used. That is, sensing a specific resource for resource selection may include referencing whether the resource corresponding to the specific resource is occupied or used within the sensing window (i.e., at a previous time point based on the specific resource). Since sidelink resource allocation can have periodic characteristics, the resource to be sensed in the resource pool (or selection window) may correspond to a sensing reference resource within a previous sensing window. For example, when using a sensing reference resource within a sensing window corresponding to the resource to be sensed in the resource pool (or selection window), it can be assumed that the corresponding resource to be sensed in the resource pool (or selection window) will be heavily occupied or used by another UE. Therefore, transmission resources can be selected from the remaining resources in the resource pool that have excluded the corresponding resource. Therefore, the UE can perform control channel and / or data channel transmissions on the selected resources.

[0167] In addition, the “TTI m” corresponding to the time when the UE determines the selection / reselection corresponds to the time when the corresponding TB arrives (i.e., the TB generated in the upper layer of the UE arrives at the physical layer).

[0168] In detail, it can be expressed as a = T O And it can be expressed as b = T proc,0 Here, the length of the sensing window corresponding to the duration from "TTI ma" to "TTI mb" can be expressed as a-b+1. For example, a = T O =1000·2 u and b=T proc,0 =1. Here, the sensing window corresponds to the time slot "TTI m-1000·2 u The duration of "to time slot" TTI m-1, and the length of the sensing window (corresponding to "a-b+1=T"). O -T proc,0 +1=T O -1+1=T O ") corresponds to 1000·2 u The time slot can therefore be 1000ms. Although related to T O =1000·2 u The 1000ms time slot is used in the example above, but it is only provided as an example; 1100ms or 100ms are possible. Here, TO It is (pre-)configured to one of the above values, and can be fixed to T. proc,0 =1.

[0169] "TTI m+c" can correspond to a TTI for transmission of SA#1 (first SA) (or, if a single TTI corresponds to a single timeslot, then it corresponds to the timeslot for transmission of SA#1 (first SA)). "TTI m+d" can correspond to a TTI for initial transmission of TB#1 (first TB) indicated and transmitted by SA#1 (first SA) (or, if a single TTI corresponds to a single timeslot, then it corresponds to the timeslot for initial transmission of TB#1 (first TB)). "TTI m+e" can correspond to a TTI for retransmission of TB#1 (first TB) indicated and transmitted by SA#1 (first SA) (or, if a single TTI corresponds to a single timeslot, then it corresponds to the timeslot for retransmission of TB#1 (first TB)).

[0170] exist Figure 9 In the example, since SA and data are transmitted in the same time slot in V2X, c = d.

[0171] Here, after the initial transmission in "TTI m+c", only the retransmission in "TTI m+e" is mentioned. However, through N max The value of N allows for up to three retransmissions. For example, if N... max If N = 1, then only the initial transmission in "TTI m+c" is possible. max If N = 2, then there can be an initial transmission in "TTI m+c" and a retransmission in "TTI m+e". max If = 3, then there can be an initial transmission in "TTI m+c", a retransmission in "TTI m+e", and a retransmission in "TTI m+f", although these are not shown.

[0172] "TTI m+c" can correspond to a TTI for transmission of SA#2 (second SA) (or, if a single TTI corresponds to a single timeslot, then it corresponds to the timeslot for transmission of SA#2 (second SA)). "TTI m+d" can correspond to a TTI for initial transmission of TB#2 (second TB) indicated and sent by SA#2 (second SA) (or, if a single TTI corresponds to a single timeslot, then it corresponds to the timeslot for initial transmission of TB#2 (second TB)). "TTI m+e" can correspond to a TTI for retransmission of TB#2 (second TB) indicated and sent by SA#2 (second SA) (or, if a single TTI corresponds to a single timeslot, then it corresponds to the timeslot for retransmission of TB#2 (second TB)).

[0173] exist Figure 9 In the example, since the SA and data are transmitted in the same time slot in V2X, c' = d'.

[0174] Here, refer to Table 9, T1≤c≤T2, T1≤T proc,1 and T2≥T 2,min Here, if u = 0, 1 (i.e., if SCS = 15kHz, 30kHz), then it can be fixed with respect to T. proc,1 =The value corresponding to time slot 3. Furthermore, if u = 2, 3 (i.e., if SCS = 60kHz, 120kHz), then it can be fixed to the value corresponding to T. proc,1 =The value corresponding to slot 4. In addition, T 2,min It can be (pre-)configured to correspond to 5.2 u ,10.2 u Or 20.2 u The value of the time slot.

[0175] Furthermore, the value "ec" corresponding to the duration between the initial transmission and retransmission within the same TB can be indicated via SCI as a value corresponding to 0, 1, 2, ..., 31 time slots. If the value is zero, it indicates that there was no retransmission after the initial transmission. If the value is N... retransmission If ∈{1,2,...,31}, then it can indicate N from the initial transmission. retransmission There is a retransmission of the same TB after each time slot.

[0176] In detail, resources for initial transmissions and retransmissions of the same TB can be defined within a duration of W, where W corresponds to 32 time slots. That is, within a duration of W corresponding to 32 time slots, from the time slot "TTI m+c" corresponding to the initial transmission to "TTI m+c+31", according to the initial transmission, and according to the aforementioned N... max Values ​​of 0, 1, or 2 retransmissions are possible. Specifically, the SCI can be used to indicate in which of the 32 time slots each corresponding retransmission should be performed. If N max =2, then in N starting from "TTI m+c" retransmission After ∈{1,2,...,31} time slots, retransmission can be performed in the corresponding "TTI m+e".

[0177] Alternatively, it can be expressed as d'=d+P*j (since c=d and c'=d', c'=c+P*j), therefore it can be expressed as d'-d=c'-c=P*j. Here, P represents the resource reservation interval.

[0178] The value of P can be determined by the upper-layer signaling. Here, the maximum value of P*j can also be expressed as P. max P = 100 ms (100·2) u (Time slot), but this is provided only as an example. Here, j can be determined in the range [0, 1, ..., 10] through pre-configuration for V2X or carrier-specific network configuration. Furthermore, a single value among the values ​​selected for j can be selected and indicated through the signaling field "Resource Reservation" of the SCI included in the SA. Here, j = 0 indicates that there is no value for d', that is, there is no resource reservation after the TTI corresponding to "P*j" starting from "TTI m+d" used to transmit TB#2 (second TB). Moreover, the value of P can only be one of 5, 10, 20, and 50 ms if j = 1. Therefore, P max The value can correspond to one of the values ​​corresponding to 0, 5, 10, 20, 50, 100, 200, 300, ..., 1000ms.

[0179] The meaning of "instructed by SCI" in Table 9 includes: In the case of UE autonomous resource selection mode (or mode 2), the sending UE (or the first UE) autonomously determines the corresponding parameter value, then uses the parameters to be used in Table 9 based on the determined value, and instructs the receiving UE (the second UE) through SCI so that the receiving UE (or the second UE) can know the determined value.

[0180] Figure 10 This illustrates a V2X resource allocation method to which this disclosure can be applied.

[0181] As described above, in the eNodeB resource scheduling mode (or mode 1), the time slot for transmitting SA can be the first time slot included in the set of resource candidates that can be used for V2X on a V2X carrier (or frequency band) from the time slot after the eNodeB transmits DCI (Ams, where A = 4, but not limited to this). Here, information about a resource block, which is the frequency axis resource used for SA transmission within the time slot for transmitting SA, can be indicated by the DCI.

[0182] Furthermore, in eNodeB resource scheduling mode (or mode 1), the DCI includes content related to the SCI included in the SA, serving as information required by the UE to transmit data in V2X communication. The DCI is sent from the eNodeB to the UE.

[0183] Here, the first UE can determine sidelink scheduling information based on the DCI, and can generate the determined sidelink scheduling information as the first SCI and the second SCI. The first UE can send the first SCI to the second UE via PSCCH, and can send the second SCI to the second UE via a portion of the available PSSCH transmission resources. The second UE can identify sidelink resources based on the first SCI and the second SCI received from the first UE, wherein the first UE uses the sidelink resources to send sidelink data via PSSCH. The second UE can receive the sidelink data from the first UE via PSSCH on the identified resources.

[0184] Furthermore, in UE autonomous resource selection mode (or mode 2), the UE autonomously determines the time slots in the resource pool for transmitting SA by sensing, and can also autonomously determine the resource blocks in the resource pool as frequency axis resources for transmitting SA in the time slots for transmitting SA. Therefore, unlike eNodeB resource scheduling mode (or mode 1), in UE autonomous resource selection mode (or mode 2), the UE autonomously determines the resources without separately receiving the signaling fields related to resource scheduling included in and thereby indicated in the DCI.

[0185] Furthermore, in UE autonomous resource selection mode (or mode 2), the UE autonomously determines the content related to the SCI included in the SA, which is the information required for the UE to transmit data in V2X communication. Therefore, unlike eNodeB resource scheduling mode (or mode 1), in UE autonomous resource selection mode (or mode 2), the UE performs autonomous determination without needing to separately receive the signaling fields related to the SCI included in and indicated by the DCI.

[0186] Here, the first UE can autonomously determine sidelink scheduling information and generate the determined sidelink scheduling information as a first SCI and a second SCI. The first UE can send the first SCI to the second UE via PSCCH and can send the second SCI to the second UE via a portion of the available PSSCH transmission resources. The second UE can identify sidelink resources based on the first and second SCIs received from the first UE, through which the first UE sends sidelink data via PSSCH. The second UE can receive the sidelink data from the first UE via PSSCH on the identified resources.

[0187] Specifically, there is a difference: in eNodeB resource scheduling mode (or mode 1), the SCI included in the SA (Service Information Component) is scheduled by the eNodeB as the information required for the UE to transmit data, while in UE autonomous resource selection mode (or mode 2), the UE autonomously selects the SCI. However, in both eNodeB resource scheduling mode (or mode 1) and UE autonomous resource selection mode (or mode 2), the SCI included in the SA is required by the data receiving UE (receiving UE or second UE) to fully decode the data transmitted from the data sending UE (transmitting UE or first UE). Therefore, the data sending UE (or first UE) needs to send the SA including the SCI to the data receiving UE (or second UE).

[0188] As mentioned above, the above references Figure 7 and Figure 8 The configuration of pool resources in V2X is described, especially for V-UE, as referenced above. Figure 9 A sensing-based resource selection method is described.

[0189] Unlike vehicle-to-vehicle (V2V) communication considering V-UE, additional energy savings can be considered in vehicle-to-pedestrian (V2P) communication from V-UE to pedestrian-user equipment (P-UE) or pedestrian-to-vehicle (P2V) communication from P-UE to V-UE. That is, while power-limited scenarios may not be considered for V-UEs because the UE is included in a vehicle, P-UEs are pedestrian UEs with limited battery power and therefore require consideration of power-limited scenarios.

[0190] Therefore, as Figure 8 As shown, for V-UE, a sensing-based resource selection method (hereinafter referred to as the full sensing method) can be applied to all resources for a specific duration (e.g., 1000ms corresponding to the duration from "TTI ma" to "TTI m-b"). Meanwhile, for P-UE, a sensing-based resource selection method (hereinafter referred to as the partial sensing method) is required for some resources for a specific duration (e.g., 1000ms corresponding to the duration from "TTI ma" to "TTI mb") to save power.

[0191] Consider the following scenario: the P-UE sends sidelink control information and data to the V-UE (corresponding to the case of performing V2P communication and the case where the V-UE, such as a vehicle, obtains information about the P-UE, such as a pedestrian, and prepares for security issues). Conversely, consider the following scenario: the P-UE does not receive sidelink control information and data from the V-UE (corresponding to the case of not performing V2P communication and the case where the V-UE, such as a vehicle, does not need to obtain information about the P-UE, such as a pedestrian, and does not need to prepare for security issues). When considering support for devices lacking this sidelink reception capability, the P-UE also needs to be based on a random resource selection method (hereinafter referred to as the random resource selection method).

[0192] That is, such as Figure 8 The fully sensing method in the example can be applied to the resource selection method of V-UE, and the resource pool can be as follows: Figure 7 and 8 The configuration is as shown in the example.

[0193] While resource selection methods for power-constrained P-UEs may require some sensing methods, detailed operational procedures related to this have not yet been defined. Furthermore, detailed configuration methods for resource pools for power-constrained P-UEs have not yet been defined.

[0194] Furthermore, although the random resource selection method may need to be applied to the resource selection method of P-UEs lacking sidelink reception capability, no detailed operation has been defined to date. Additionally, no detailed configuration method has been defined for the resource pool of P-UEs lacking sidelink reception capability to date.

[0195] like Figure 7 and Figure 8 In the example, a partially sensed resource pool (specifically, a time-slot pool corresponding to time-domain resources) for P-UE can be defined based on a fully sensed resource pool (specifically, a time-slot pool corresponding to time-domain resources) for V-UE. That is, the fully sensed method and the partially sensed method may only differ in the size of the sensing window and can perform similar sense-based operations, which can lead to simplified complexity.

[0196] In addition, such as Figure 7 and Figure 8As in the example, a resource pool for P-UE based on random resource selection (specifically, a time-slot pool corresponding to time-domain resources) can be defined independently from the fully sense-based resource pool for V-UE (specifically, a time-slot pool corresponding to time-domain resources). When the resource pool for P-UE (specifically, a time-slot pool corresponding to time-domain resources) is configured independently, P-UE performance can be improved compared to a shared resource pool (specifically, a time-slot pool corresponding to time-domain resources). In other words, because the resources for P-UE based on random resource selection are configured independently and are not affected by other resources (e.g., partially sense-based resources for P-UE and / or fully sense-based resources for V-UE), P-UE performance can be improved.

[0197] On the other hand, such as Figure 7 and Figure 8 As in the example, a resource pool for P-UE based on random resource selection (specifically, a time-slot pool corresponding to time-domain resources) can be defined by sharing a fully sense-based resource pool for V-UE (specifically, a time-slot pool corresponding to time-domain resources). This is to prevent the reduction of available V2V resources when configuring independent resources for P-UE, thus affecting V2V performance. Furthermore, by sharing a single pool, resources can be used more efficiently without wasting them.

[0198] Here, the resource pool for P-UE based on random resource selection (specifically, the time slot pool corresponding to time-domain resources) and the resource pool for P-UE based on partial sensing (specifically, the time slot pool corresponding to time-domain resources) can be distinguished from each other using mutual orthogonality. This is to ensure that the resources used by P-UE based on partial sensing do not interfere with P-UE based on random resource selection.

[0199] Before describing the method for configuring P-UE resource selection and resource pools (specifically, time slot pools corresponding to time-domain resources), the configuration of fully sense-based V-UE resource selection and resource pools will be described first.

[0200] Figure 11 This illustrates how this disclosure can be applied to fully sense-based resource selection and resource pool configuration.

[0201] exist Figure 11 In this context, resource pools can be configured based on excluded time slots and bitmap repetitions within the SFN or DFN period. Figure 7 As described in the example, resources can be selected based on sensing data from the resource pool configured above.

[0202] Reference Figure 11(a) In the case of TTI m+c, transmission resources are selected from the resource pool belonging to the duration of [TTI m+T1, TTI m+T2], and the sensing results in the continuous resource time slot (i.e., the sensing window in full sensing) can be used for resource selection.

[0203] Here, m≤m+T1≤m+T proc,1 and m+T 2,min ≤m+T2≤m+P step In other words, the values ​​of T1 and T2 can be determined by using T1≤T proc,1 And T 2,min ≤T2≤P step To determine.

[0204] Here, as mentioned above, if u = 0, 1 (i.e., if SCS = 15kHz, 30kHz), then it can be fixed with T. proc,1 =3 timeslots corresponding to the value. If u = 2, 3 (i.e., if SCS = 60kHz, 120kHz), then it can be fixed to the value corresponding to T. proc,1 =The value corresponding to slot 4. In addition, T 2,min It can be (pre-)configured to correspond to 5.2 u 10.2 u 、or 20·2 u The value of the time slot.

[0205] P step This refers to the maximum value of the window used to select V2X data transmission resources (i.e., the selection window) and the value that takes into account the service cycle of periodic V2X messages in the upper layer. For example, 100ms (100·2) is the maximum value of the resource reservation interval P mentioned above. u (Time slot) can be P step The value is not limited to this.

[0206] Reference Figure 11 (b) can be applied to the total T o Sensing is performed in each time slot. Here, T o A time slot can correspond to a time slot corresponding to the duration from "TTIm-a" to "TTI mb". For example, as mentioned above, if a = T o =1000·2 u (time slot) and b = T proc,0 =1, then it can be done by combining with 1000·2 uSensing is performed on the sensing window corresponding to the time slot to verify the resources occupied and used by another terminal. Based on this, control channel and data channel transmission can be performed on the remaining resources in the resource pool that are not currently occupied and used by other UEs or will be used by other UEs (i.e., selecting TTI m+c, TTI m+e, TTI m+c', and TTI m+e').

[0207] Here, TTI m+c and TTI m+c' (similarly, TTI m+e and TTI m+e') can differ by P*j TTIs (if a single TTI represents a single time slot to which the resource pool indicator bitmap is to be applied, then it is P*j time slots). The maximum value of P*j can also be expressed as P... max Here, P = 100ms(100·2) u The time slot (but not limited to this) can be determined by upper-layer signaling. Furthermore, j can be determined within the range [0, 1, ..., 10] by pre-configuration for V2X or carrier-specific network configuration. Additionally, a single value among the values ​​selected for j can be selected and indicated by the signaling field "Resource Reservation" of the SCI included in the SA. Here, j = 0 indicates that there is no value for c', that is, there is no resource reservation after the TTI corresponding to "P*j" after "TTI m+c" for transmission of TB#2 (second TB). Moreover, the value of P can only be one of 5, 10, 20, and 50 ms if j = 1. Therefore, P max The value can correspond to one of the values ​​corresponding to 0, 5, 10, 20, 50, 100, 200, 300, ..., 1000ms.

[0208] Figure 12 This illustrates how the present disclosure can be applied to partially sensing-based resource selection and resource pool configuration.

[0209] exist Figure 12 In this context, resource pools can be configured based on excluded time slots and bitmap repetitions within an SFN or DFN period. Figure 7 As described in the example, resources can be selected based on sensing data from the resource pool configured above.

[0210] Reference Figure 12 (a) In the case of partial sensing, TTI m+c selects transmission resources from the resource pool belonging to the resource region corresponding to Y time slots, and the sensing results in non-contiguous resource time slots (i.e., the sensing window in partial sensing) can be used for resource selection. Here, Y time slots can be selected within the duration of [TTI m+T1, TTI m+T2].

[0211] In other words, in the case of full sensing, the sensing results within a sensing window including consecutive resource slots [TTI ma, TTI mb] can be used to select data transmission resources from a resource pool included in a duration of [TTI m+T1, TTI m+T2]. In the case of partial sensing, the sensing results within a sensing window including non-consecutive resource slots can be used to select data transmission resources from Y slots within a duration of [TTI m+T1, TTI m+T2]. As described above, the size of the sensing target in partial sensing can be reduced compared to full sensing.

[0212] refer to Figure 12 (b) To determine whether to select the resources to be sensed corresponding to the Y time slots within the selection window, only for the total (T) o / P step Partial sensing is performed using )·Y·N / 10 time slots. That is, the sensing reference resources within the sensing window can be configured with (T o / P step )·Y·N / 10 time slots. If N=10, then the total (T) o / P step Partial sensing is performed in Y time slots (i.e., sensing reference resources), such as Figure 12 As shown in the image.

[0213] Total T belonging to the sensing window o Each time slot can be divided into P step The predetermined duration corresponding to the time slot can be determined in relation to P. step Partial sensing is performed on Y time slots within a predetermined duration corresponding to the time slot. (Corresponding to P) step The predetermined duration of a time slot can be repeated a total of (T) o / P step )·N / 10 times. The sub-duration corresponding to Y time slots exists corresponding to P step Each of the time slots has a predetermined duration, and partial sensing can be performed within such sub-durations. That is, a sub-duration can correspond to the duration of a partial sensing unit.

[0214] Therefore, it is possible to obtain the total (T) from the sensing window. o / P step The resources occupied and used by another UE are verified in the sensing reference resources corresponding to N / 10 time slots. Based on this, control channel and data channel transmissions can be performed on resources selected from the remaining resources belonging to the resource pool, excluding those currently occupied and used by or to be used by other UEs. (For example, TTI m+c and TTI m+e can be selected, and although in Figure 12Not shown in the figure, but if as Figure 9 If TTI m+c' and TTI m+e' configurations are supported, then the corresponding resources can be selected.

[0215] and Figure 12 The relevant parameter values ​​are arranged as follows:

[0216] -T o :T o Each time slot corresponds to a time slot belonging to the duration from "TTI ma" to "TTI mb" in full sensing. For example, as mentioned above, if a = T o =1000·2 u (time slot) and b=T proc,0 =1, then T o It could correspond to 1000·2 u The value of the time slot.

[0217] -P step and N:P step This corresponds to the maximum value of the selection window, for example, 100.2. u (Time Slot) corresponds to 100m, but is not limited to this. Here, N can correspond to a time slot with multiple P. step The size of the P-value within the predetermined duration includes the sensing reference resource. step The number of predetermined durations for the size. For example, if T o =1000ms and P step =100ms, so there can be a total of ten (1000ms / 100ms) durations, and the size of each of these ten predetermined durations can be 100ms. Here, the predetermined duration including the sensing reference resource among these ten predetermined durations can be indicated by a 10-bit bitmap (hereinafter, sensing reference resource indicator bitmap). That is, each bit position of the 10-bit bitmap can correspond to one of the ten predetermined durations. Here, the value of N can correspond to the number of bit positions with a bit value of 1 in the 10-bit bitmap.

[0218] -Y: Y can be referred to as the duration of a partial sensing unit. That is, Y can be configured to be in the range corresponding to P. step Within the predetermined duration of each time slot, corresponding to the above reference Figure 12 The description refers to some time slots within a portion of the duration of [TTI m+T1, TTI m+T2]. Here, T1≤T proc,1 And T 2,min ≤T2≤P step Here, if u = 0, 1 (i.e., if SCS = 15kHz, 30kHz), then it can be fixed with respect to T. proc,1=The value corresponding to time slot 3. Furthermore, if u = 2, 3 (i.e., if SCS = 60kHz, 120kHz), then it can be fixed to the value corresponding to T. proc,1 =The value corresponding to slot 4. In addition, T 2,min It can be (pre-)configured to correspond to 5.2 u ,10.2 u Or 20.2 u The value of the time slot.

[0219] As described above, a UE can select sidelink transmission resources based on partial sensing. To meet the requirements in NRV2X, it is necessary to minimize the power consumption of the UE performing partial sensing (e.g., the sidelink transmitting UE or the first UE), or to avoid performing unnecessary sensing. Furthermore, it is necessary to improve the overall system resource utilization efficiency by ensuring that there is no loss of duration during sensing. Examples of improving partial sensing operation according to this disclosure are described below.

[0220] For example, when the resource reservation interval has a period less than the maximum value of the selection window, unnecessary sensing may be performed, or sensing loss duration may occur. Here, the resource reservation interval can be represented by a value P. For example, the value of P can be determined based on the value of j, and can be one of 0, 5, 10, 20, 50, 100, 200, 300, ..., 1000 ms. The maximum value of the selection window can be represented by P. step The value of P. For example, P step The value can be 100ms (or (100·2)). u (Time slot). As a detailed example, if P <P step (For example, if P = 5, 10, 20, 50 ms), unnecessary sensing may be performed, or there may be a duration of sensing loss.

[0221] Example 1

[0222] If the resource reservation interval is less than the maximum value of the selection window (i.e., P < P), step If the duration (or sub-duration) of a partial sensing unit is greater than the resource reservation interval (i.e., Y > P), then the partial sensing window may be larger than the actual required resource selection area. Therefore, unnecessary partial consumption may occur in partial sensing. Here, Y, as the duration (or sub-duration) of the partial sensing unit, can be configured with a value corresponding to P. step Some time slots within the corresponding portion of the duration of [TTIm+T1, TTIm+T2] within the predetermined duration of each time slot (reference) Figure 12 Here, T1≤T proc,1 And T 2,min ≤T2≤P stepIn the example where Y is a time slot corresponding to a duration of 40 ms from TTI m+10ms to TTI m+55ms, if P = 20ms, it is possible to perform unnecessary partial sensing in the time slot corresponding to the difference between Y and P (i.e., 25ms (= 45ms - 20ms)).

[0223] This example could include changing P. step At least one of the methods in T2 and at least one of the methods for limiting Y based on TTI m+P, where P step T2 is the basis for configuring Y as the duration (or sub-duration) of a partial sensing unit. Therefore, unnecessary partial sensing can be prevented.

[0224] Example 1-1

[0225] This example could include changing P' with P'. step The method, P step It is the basis for configuring Y as part of the sensing unit duration (or sub-duration).

[0226] Figure 13 An example of a resource selection method based on partial sensing that this disclosure can be applied to is shown.

[0227] Figure 13 Examples could include applying P' instead of Figure 12 The example of Pstep.

[0228] Here, P' can be defined as T 2,min The larger value between T and P. If P is always greater than or equal to T. 2,min Then P' = P.

[0229] Therefore, Y can be configured to correspond to the predetermined duration of the P' time slots. Figure 13 Some time slots within the duration of [TTI m+T1, TTI m+T2]. Here, T1≤T proc,1 And T 2,min ≤T2≤P'. Here, if u=0,1 (i.e., if SCS=15kHz,30kHz), then it can be fixed with T proc,1 =The value corresponding to time slot 3. Furthermore, if u = 2, 3 (i.e., if SCS = 60kHz, 120kHz), then it can be fixed to the value corresponding to T. proc,1 =The value corresponding to slot 4. In addition, T 2,min It can be (pre-)configured with a configuration corresponding to 5.2 u ,10.2 u , or 20.2 u The value of the time slot.

[0230] The value of P can be one of 5, 10, 20, 50, and 100 ms. Alternatively, some values ​​of P that are less than or equal to the reference value may not be used for partial sensing. If the reference value = 10 ms, then the value of P can be one of 20, 50, and 100 ms.

[0231] Example 1-2

[0232] This example could include changing T2, which serves as the basis for configuration Y, to T2·i, where Y is the duration (or sub-duration) of a portion of the sensing unit.

[0233] Figure 14 Additional examples of resource selection methods based on partial sensing to which this disclosure can be applied are shown.

[0234] Figure 14 Examples could include applying T2·I instead of Figure 12 T2 in the example.

[0235] Here, i (0 < i ≤ 1) can be defined as P / P step .

[0236] With Figure 12 The example selects some time slots within a portion of the duration corresponding to the [TTI m+T1, TTI m+T2] time slot as the Y time slot, which is different from the example. Figure 14 In the example, some time slots within a certain duration corresponding to [TTI m+T1, TTI m+T2·i] can be selected as Y time slots.

[0237] Therefore, Y can be configured to correspond to P step The time slot has a corresponding duration within its predetermined duration. Figure 14 Some time slots within a portion of the duration of [TTI m+T1, TTI m+T2·i]. Here, T1≤T proc,1 And T 2,min ≤T2≤P step Here, if u = 0, 1 (i.e., if SCS = 15kHz, 30kHz), then it can be fixed with respect to T. proc,1 =The value corresponding to time slot 3. Furthermore, if u = 2, 3 (i.e., if SCS = 60kHz, 120kHz), then it can be fixed to the value corresponding to T. proc,1 =The value corresponding to slot 4. In addition, T 2,min It can be (pre-)configured with a configuration corresponding to 5.2 u ,10.2 u , or 20.2 u The value of the time slot.

[0238] The value of P can be one of 5, 10, 20, 50, and 100 ms. Alternatively, some values ​​of P that are less than or equal to the reference value may not be used for partial sensing. If the reference value = 10 ms, then the value of P can be one of 20, 50, and 100 ms.

[0239] Example 1-3

[0240] This example could include limiting Y based on TTI m+P when configuring Y as a partial sensing unit duration (or sub-duration).

[0241] Figure 15 Additional examples of resource selection methods based on partial sensing to which this disclosure can be applied are shown.

[0242] Figure 15 Examples can include, for example, Figure 12 When selecting Y time slots as in the example, an additional condition is applied that restricts the Y time slots to the previous time slots of TTI m+P.

[0243] That is, within a portion of the duration corresponding to [TTI m+T1, TTI m+T2], some time slots can be selected as Y time slots, while those belonging to [TTI m+P, TTI m+P]... step The time slots can be left out (or excluded) as Y time slots.

[0244] In other words, if T2≤P, then within a portion of the duration corresponding to [TTI m+T1, TTI m+T2], some time slots can be selected as Y time slots. If T2>P, then within a portion of the duration corresponding to [TTI m+T1, TTI m+P], some time slots can be selected as Y time slots.

[0245] Therefore, Y can be configured to correspond to P step The time slot corresponding to the predetermined duration Figure 15 Some time slots within a portion of the duration [TTIm+T1, TTIm+T2]. Here, the preceding time slot of TTIm+P can be Y time slots (i.e., time slots exceeding TTIm+P can be excluded from Y time slots). Here, T1≤T proc,1 And T 2,min ≤T2≤P step Here, if u = 0, 1 (i.e., if SCS = 15kHz, 30kHz), then it can be fixed with respect to T. proc,1 =The value corresponding to time slot 3. Furthermore, if u = 2, 3 (i.e., SCS = 60, 60kHz, 120kHz), then it can be fixed to the value corresponding to T. proc,1=The value corresponding to slot 4. In addition, T 2,min It can be (pre-)configured with a configuration corresponding to 5.2 u ,10.2 u , or 20.2 u The value of the time slot.

[0246] The value of P can be one of 5, 10, 20, 50, and 100 ms. Alternatively, some values ​​of P that are less than or equal to the reference value may not be used for partial sensing. If the reference value = 10 ms, then the value of P can be one of 20, 50, and 100 ms.

[0247] Example 2

[0248] If the resource reservation interval is less than the maximum value of the selection window (i.e., P), <P step If some resource reservation intervals do not belong to the duration (or sub-duration) of a portion of the sensing unit, then some resource reservation intervals may not belong to the duration of a portion of the sensing unit. That is, if data (or TB) generated in the upper layer is transmitted to the physical layer in period P, the duration corresponding to the Kth period P may not belong to time slot Y. In this case, a sensing loss duration may occur. For example, Y could be set to P. step =100ms period, and if in P step Delivering data in shorter periods (e.g., 20ms or 50ms) results in P... step Before the periodic execution of sensing in the Y time slot, it may be in a time slot greater than P. step Resource selection (or reselection) is performed in shorter cycles. Therefore, the probability of actual information loss may increase.

[0249] This example may include at least one of the following methods: changing P step and T o The method of at least one of the methods and the method of changing the format of the sensing reference resource indicator bitmap, wherein P step and T o This is the basis for configuring Y as part of the sensing unit duration (or sub-duration). Therefore, missing sensing can be prevented.

[0250] Figure 16 An example of a partial sensing resource pool configuration to which this disclosure can be applied is shown.

[0251] Figure 16 Examples can include using P step 'Change is Figure 12 P in the example step In this case, instead of T o Time slots are divided into each slot with P step The predetermined duration of a time slot can be To Time slots are divided into each slot with P step 'The predetermined duration of the time slot.' Here, although P step Values ​​such as Figure 12 The example configuration or given is as described, but P corresponds to the size of the predetermined duration. step The value of ' can be expressed as a relation to P step Configure them separately.

[0252] Here, P step =P. That is, the magnitude of the predetermined duration (P) step The selection window (') can be configured to be the same as the resource reservation interval (P). However, it may not indicate the maximum value (P) of the selection window. step ) was P step Replace or change.

[0253] Here, P is the predetermined duration, which is the same size as the resource reservation interval. step The value of ' can be one of 5, 10, 20, 50, and 100 ms. Alternatively, in P... step Some values ​​of ' that are less than or equal to the reference value may not be used for partial sensing. If the reference value = 10ms, P step The value of ' can be one of 20, 50, and 100ms.

[0254] Separately or additionally, Figure 16 Examples can be included in Figure 12 In the example, T is changed by T o Here, it can be defined as T = T o ·i. Here, it can be defined as i(0 <i≤1)=P step ' / P step =P / P step Here, i can be defined as the ratio of the predetermined duration (or resource reservation interval) to the maximum value of the selection window.

[0255] As mentioned above, if P step and T o At least one change in T can change the indication in relation to T o The time corresponding to the scheduled P within the time slot step The format of the bitmap (i.e., the sensing reference resource indicator bitmap) includes the predetermined duration of the sensing reference resource within the predetermined duration of the size. Therefore, the definition of the value of N corresponding to the number of bit positions with a bit value of 1 in the sensing reference resource indicator bitmap can be changed as follows.

[0256] Example 2-1

[0257] This example could include configuring the size of the predetermined duration to be equal to the resource reservation interval and without changing T. o In other words, this example corresponds to the application of P. step =P and T o Example of 1000ms.

[0258] In this case, for T o =1000ms, which can be compared with the total 10 / I(1000ms / P) step The number of bit positions with a bit value of 1 is defined in the 10 / i bitmap corresponding to a predetermined duration of '=1000ms / P). Here, i(0 <i≤1)=P step ' / P step =P / P step .

[0259] If P step =P=100ms and P step =100ms, then i=P step ' / P step =1 and T o =1000ms can be divided into a total of 10 (=10 / 1) predetermined durations. That is, there can be 10 predetermined durations, each with a size of 100ms. In this case, the sensing reference resource indicator bitmap can have a 10-bit bitmap format. That is, each bit position of the 10-bit bitmap can correspond to one of the 10 predetermined durations. Here, N can correspond to the number of bit positions with a bit value of 1 in the 10-bit bitmap.

[0260] If P step =P=50ms and P step =100ms, then i=P step ' / P step =0.5 and T o =1000ms can be divided into a total of 20 (=10 / 0.5) predetermined durations. That is, there can be 20 predetermined durations, each with a size of 20. In this case, the sensing reference resource indicator bitmap can have a 20-bit bitmap format. That is, each bit position of the 20-bit bitmap can correspond to one of the 20 predetermined durations. Here, N can correspond to the number of bit positions with a bit value of 1 in the 20-bit bitmap.

[0261] If P step =P=20ms and P step =100ms, then i=P step ' / P step =0.2 and T o=1000ms can be divided into a total of 50 (=10 / 0.2) predetermined durations. That is, there can be 50 predetermined durations, each with a size of 20ms. In this case, the sensing reference resource indicator bitmap can have a 50-bit bitmap format. That is, each bit position of the 50-bit bitmap can correspond to one of the 50 predetermined durations. Here, N can correspond to the number of bit positions with a bit value of 1 in the 50-bit bitmap.

[0262] As described above, the length of the sensing reference resource indicator bitmap can be determined differently depending on the value of P. That is, in the aforementioned example, 10-bit, 20-bit, and 50-bit bitmaps can be configured to be independent of each other.

[0263] Example 2-2

[0264] Similar to Example 2-1, this example may include application P step =P and T o =1000ms, and thereby configure the sensing reference resource indication bitmap as a 10 / i bitmap.

[0265] Here, the 10 / i bitmap may include repetitions of a predetermined cell bitmap. For example, if the predetermined cell is 10 bits, the 10 / i bitmap may include 1 / i repetitions of a 10-bit bitmap. For example, 10-bit, 20-bit, and 50-bit bitmaps may include 1 repetition, 2 repetitions, and 5 repetitions of a 10-bit bitmap, respectively.

[0266] Therefore, in T o A predetermined duration containing sensing reference resources among multiple predetermined durations within a time slot can be configured with a pattern in which a predetermined unit is repeated, each of the multiple predetermined durations having P step = The size of P.

[0267] As an additional example, a predetermined cell bitmap and a group bitmap indicating whether the predetermined cell bitmap is applied can be defined for a sense reference resource indicator bitmap. For example, when the sense reference resource indicator bitmap is configured as an E-bit bitmap, the predetermined cell bitmap can be an F-bit bitmap, and the group bitmap can be a G (=E / F) bitmap. In this case, each bit position of the group bitmap can correspond to an F-bit cell in the E-bit bitmap, and the F-bit bitmap can be applied to the F-bit cells corresponding to the bit positions in the group bitmap with a value of 1. Furthermore, the F-bit bitmap may not be applied to the F-bit cells corresponding to the bit positions in the group bitmap with a value of 0 (i.e., all F bits can have a value of 0). Therefore, the overhead of the sense reference resource indicator bitmap can be reduced.

[0268] Example 2-3

[0269] This example could include configuring the size of the predetermined duration to be equal to the resource reservation interval, and setting it to T = T. o •i. That is, this example corresponds to the application P. step =P and T=T o ·i=T o ·(P step ' / P step Examples of ).

[0270] In this case, for T=T o ·i=T o ·(P step ' / P step The number of bit positions with a bit value of 1 in a 10-bit bitmap corresponding to a total of 10 predetermined durations can be defined as N.

[0271] If P step =P=100ms and P step =100ms, then i=P step ' / P step =1 and T=T o ·i=T o ·(P step ' / P step =1000ms can be divided into a total of 10 predetermined durations. That is, there can be 10 predetermined durations, each with a size of 100ms. In this case, the sensing reference resource indicator bitmap can have a 10-bit bitmap format. That is, each bit position of the 10-bit bitmap can correspond to one of the 10 predetermined durations. Here, N can correspond to the number of bit positions with a bit value of 1 in the 10-bit bitmap.

[0272] If P step =P=50ms and P step =100ms, then i=P step ' / P step =0.5 and T=T o ·i=T o ·(P step ' / P step The 500ms period can be divided into a total of 10 predetermined durations. That is, there can be 10 predetermined durations, each with a size of 50ms. In this case, the sensing reference resource indicator bitmap can have a 10-bit bitmap format. That is, each bit position in the 10-bit bitmap can correspond to one of the 10 predetermined durations. Here, N can correspond to the number of bit positions in the 10-bit bitmap with a bit value of 1.

[0273] If Pstep =P=20ms and P step =100ms, then i=P step ' / P step =0.2 and T=T o ·i=T o ·(P step ' / P step The 200ms period can be divided into a total of 10 predetermined durations. That is, there can be 10 predetermined durations, each with a length of 20ms. In this case, the sensing reference resource indicator bitmap can have a 10-bit bitmap format. That is, each bit position in the 10-bit bitmap can correspond to one of the 10 predetermined durations. Here, N can correspond to the number of bit positions in the 10-bit bitmap with a bit value of 1.

[0274] According to this example, without changing the sensing reference resource indicator bitmap, the size of the entire sensing window duration can be reduced based on i.

[0275] Figure 17 This is a flowchart illustrating a resource selection method based on partial sensing to which this disclosure can be applied.

[0276] When data (or TB) is transmitted from the upper layer (i.e., in TTI m), the first UE can perform partial sensing and determine the side link transmission resources (i.e., TTI m+c, etc.).

[0277] In operation S1710, the first UE can determine the duration of a portion of the sensing units in the resource pool. This resource pool may be, for example, as follows: Figure 7 and 8 As in the example, it is determined. When determining the resource pool, the duration of a portion of the sensing units (i.e., the duration including Y time slots) can be determined from it.

[0278] Here, Example 1 above can be applied when the first UE determines the duration of a portion of the sensing unit. For example, if the resource reservation interval is less than the maximum value of the selection window (i.e., P < P), step If so, then Example 1 above can be applied.

[0279] In detail, the first UE can be represented by P' (where P' is T). 2,min (The larger value between P and P) changes P step And it is possible to determine [TTI m+T1, TTI m+T2] (where T is the time interval corresponding to the predetermined duration of time slot P') within a given duration. 2,minThe Y time slot corresponding to some time slots (one or more) within ≤T2≤P') is used as part of the sensing unit duration (refer to Example 1-1). Alternatively, the first UE can use T2·i(where i(0)) <i≤1)=P / P step Change T2, and you can change the corresponding P step The Y-slots of some (one or more) of the time slots [TTI m+T1, TTI m+T2·i] within the predetermined duration of the time slot are determined as a portion of the sensing unit duration (refer to Examples 1-2). Alternatively, the first UE can limit the Y time slots to correspond to P. step The previous time slots of TTI m+P in [TTI m+T1, TTI m+T2] within the predetermined duration of each time slot are used to determine the Y time slots as the partial sensing unit duration (refer to Examples 1-3). In addition, when determining the partial sensing unit duration, one or a combination of at least two of Examples 1-1, 1-2 and 1-3 above can be applied.

[0280] In operation S1720, the first UE can determine the resource to be sensed within a portion of the sensing unit's duration. For example, the duration of the portion of the sensing unit may correspond to Y time slots, and the resource to be sensed may be determined to be one of the time slots y.

[0281] In operation S1730, the first UE can determine at least one sensing reference resource associated with the determined time slot y.

[0282] For example, when time slot y is determined as the resource to be sensed, one or more time slots corresponding to yk*P can also be determined as the sensing reference resource.

[0283] Here, the sensing reference resource can be determined by a bitmap (i.e., a sensing reference resource indicator bitmap). The sensing reference resource indicator bitmap can be configured as in Example 2 above, for example, if the resource reservation interval is less than the maximum value of the selection window (i.e., P < P). step If so, then the aforementioned Example 2 can be applied.

[0284] In detail, the first UE can transmit P corresponding to the magnitude of the predetermined duration. step Change to P step =P (that is, set the size of the predetermined duration to be equal to the resource reservation interval), and can be used relative to T o The corresponding duration is the sum of 10 / i (where i(0)). <i≤1)=P step ' / P step =P / P stepThe sensing reference resource is determined by a 10 / i bitmap corresponding to a predetermined duration. Here, the sensing reference resource can be configured independently based on the value of P in the 10 / i bitmap (see Example 2-1), or it can be configured with repetition of the 10-bit bitmap (see Example 2-2). Alternatively, the first UE can use P corresponding to the magnitude of the predetermined duration. step Change to P step =P (that is, set the size of the predetermined duration to be equal to the resource reservation interval), and can be used relative to T=T o ·i=T o ·(P step ' / P step The sensing reference resource is determined by a 10-bit bitmap corresponding to a total of 10 predetermined durations (see Example 2-3). Furthermore, when determining the sensing reference resource, one or at least a combination of two of Examples 2-1, 2-2, and 2-3 above can be applied.

[0285] For example, the sensing reference resource (i.e., time slot yk*P) associated with the time slot y that is the resource to be sensed. step ') can be determined as a slot belonging to a 10 / i bit map, or a predetermined duration (one or more) in which the bit value at the k-th bit position corresponds to 1 in the 10-bit bit map.

[0286] For example, suppose the sensing reference resource indicator bitmap is configured as a 20-bit bitmap of 1000000001100000000. In this case, the bit values ​​at positions 1, 2, 11, and 12 in the bitmap indicate 1, meaning k = 1, 2, 11, and 12. That is, with yP step ',y-2P step ',y-11P step 'and y-12P step The corresponding time slot can be identified as a sensing reference resource.

[0287] In operation S1740, the first UE can select a sidelink transmission resource based on the sensing results for at least one sensing reference resource.

[0288] For example, since at least one sensing reference resource is configured with T or T from “TTI ma” to “TTI mb”. o Some time slots (one or more) during the duration of the event, so it can be said that partial sensing was performed.

[0289] In detail, for the first UE, partial sensing may include the following detailed process.

[0290] Step 1: Select time slot y from the resource pool (corresponding to the resource to be sensed above). This resource pool belongs to the resource region corresponding to the Y time slots (corresponding to the duration of the aforementioned partial sensing unit).

[0291] Step 2: In time slot yk*P step The monitoring is performed on the time slot y, which is the resource of the sensing reference associated with the time slot y, i.e., the single resource to be sensed selected in step 1.

[0292] Step 3: Determine the threshold that will be used in subsequent resource exclusion operations.

[0293] Step 4: Set the set S of candidate single subframe / slot resources A and resource set S B Here, S A This represents the set of all possible candidate subframes / slot resources. The candidate subframes / slot resources can be represented as R. x,y y represents the time slot y as the single resource to be sensed, and x corresponds to the frequency axis resource in time slot y. Here, S B It is initially set to an empty set.

[0294] Step 5: Time slots that satisfy specific conditions regarding all possible values ​​of y in the resource pool are excluded. This resource pool belongs to the resource region corresponding to the y time slots. That is, among the multiple SCIs received by the UE, time slots y that have been reserved for resources by other UEs based on SCIs greater than the threshold are excluded from the resource pool belonging to the resource region corresponding to the y time slots.

[0295] Step 6: If it belongs to S after elimination A The number of candidate subframes / slot resources is less than 0.2M. total Then, step 4 is repeated by increasing the threshold in step 3 by 3 dB. Here, M total This indicates the number of all candidate single subframes / slot resources.

[0296] Step 7: Regarding S in Step 6 A For each of the remaining candidate single subframes / slot resources, by applying the method in step 2 with yk*P step E is calculated by averaging the monitoring values ​​of all corresponding time slots. x,y .

[0297] Step 8: According to E calculated in step 7 x,y The values, in descending order, will belong to set S. A Candidate single-frame / slot resources are moved to set S B until it belongs to S B The number of candidate subframes / slot resources becomes 0.2M.total .

[0298] Step 9: Report S to the upper level B .

[0299] Based on the reported partial sensing results, resources for each UE to transmit V2X data are determined. Specifically, in eNodeB scheduling mode, the eNodeB can determine resources based on the reported information and can send the determined resources to the UE. Based on this, resources for each UE to transmit V2X data can be determined.

[0300] During operation S1750, the first UE can send information (e.g., SA) indicating the determined sidelink transmission resources to the second UE via PSCCH.

[0301] In operation S1760, the first UE can send sidelink data to the second UE via PSSCH on the indicated sidelink transmission resources.

[0302] Figure 18 This is a diagram illustrating the configuration of the first terminal device and the second terminal device according to this disclosure.

[0303] The first terminal device 1800 may include a processor 1810, an antenna device 1820, a transceiver 1830, and a memory 1840.

[0304] Processor 1810 can perform baseband-related signal processing and may include upper-layer processing unit 1811 and physical (PHY) layer processing unit 1815. Upper-layer processing unit 1811 can handle MAC layer, RRC layer, or other upper-layer operations. PHY layer processing unit 1815 can handle PHY layer operations (e.g., downlink receive signal processing, uplink transmit signal processing, sidelink transmit signal processing, etc.). In addition to performing baseband-related signal processing, processor 1810 can also control the overall operation of first terminal device 1800.

[0305] Antenna device 1820 may include at least one physical antenna. If antenna device 1820 includes multiple antennas, multiple-input multiple-output (MIMO) transmission and reception can be supported. Transceiver 1830 may include a radio frequency (RF) transmitter and an RF receiver. Memory 1840 may store operational processing information associated with the operation of processor 1810, software, operating system (OS), applications, etc., and may include components such as buffers.

[0306] The processor 1810 of the first terminal device 1800 can be configured to implement the side-link transmission operation of the UE (or the first terminal) in the example described herein.

[0307] For example, the upper-layer processing unit 1811 of the processor 1810 of the first terminal device 1800 may include a side-link (SL) resource allocation determiner 1812.

[0308] The SL resource allocation determiner 1812 can determine SL transmission resources based on partial sensing results transmitted from the PHY layer processing unit 1815, and can transmit information about the SL transmission resources to the PHY layer processing unit 1815.

[0309] The PHY layer processing unit 1815 of the processor 1810 of the first terminal device 1800 may include a partial sensing unit duration determiner 1816 and a sensing reference resource determiner 1817.

[0310] When the upper-layer processing unit 1811 (i.e., in TTI m) transmits data (or TB), the PHY layer processing unit 1815 can determine the side link transmission resources (i.e., TTI m+c, etc.) by performing partial sensing.

[0311] The partial sensing unit duration determiner 1816 can determine the duration of a portion of the sensing units in the resource pool (i.e., the duration of Y time slots).

[0312] Here, Example 1 above can be applied when the first UE determines the duration of a portion of the sensing unit. For example, if the resource reservation interval is less than the maximum value of the selection window (i.e., P < P), step If so, then Example 1 above can be applied.

[0313] In detail, the partial sensing unit duration determiner 1816 can determine the duration corresponding to P' (here, T). 2,min The larger value between T and P) within a predetermined duration and [TTI m+T1, TTI m+T2] (where T is the larger value between T and P) 2,min Y time slots corresponding to some time slots (one or more) within the range ≤T2≤P' are determined as partial sensing unit durations (see Example 1-1). Alternatively, the partial sensing unit duration determiner 1816 can determine the duration of Y corresponding to P'. step [TTI m+T1, TTI m+T2·i] (where i(0)) within the predetermined duration of each time slot <i≤1)=P / P step The Y time slots corresponding to some time slots (one or more) within the range are determined as a partial sensing unit duration (see Example 1-2). Alternatively, the partial sensing unit duration determiner 1816 can determine the duration of the partial sensing unit by considering the time slots corresponding to P. stepY time slots from the previous time slots of TTI m+P within [TTI m+T1, TTI m+T2] within a predetermined duration corresponding to a time slot are determined as a portion of the sensing unit duration (refer to Examples 1-3). Furthermore, one or a combination of at least two of Examples 1-1, 1-2, and 1-3 above can be applied.

[0314] The PHY layer processing unit 1815 can determine the resource to be sensed within a portion of the sensing unit's duration. For example, the duration of a portion of the sensing unit may correspond to Y time slots, and the resource to be sensed may be determined as time slot y.

[0315] The sensing reference resource determiner 1817 can determine at least one sensing reference resource associated with the determined time slot y.

[0316] For example, if time slot y is determined to be the resource to be sensed, one or more time slots corresponding to yk*P can be determined as sensing reference resources.

[0317] Here, the sensing reference resource can be determined by a bitmap (i.e., a sensing reference resource indicator bitmap). The sensing reference resource indicator bitmap can be configured as in Example 2 above. For example, if the resource reservation interval is less than the maximum value of the selection window (i.e., P < P), step If so, then the aforementioned Example 2 can be applied.

[0318] In detail, if the size of the predetermined duration is set to P step =P (that is, if the magnitude of the predetermined duration is set to be equal to the resource reservation interval), then the sensing reference resource determiner 1817 can be relative to the corresponding T o The duration is used to correspond to a total of 10 / i (where i(0)). <i≤1)=P step ' / P step =P / P step The sensing reference resource is determined by a 10 / i-bit bitmap of a predetermined duration. Here, the sensing reference resource can be configured independently based on the value of P in the 10 / i-bit bitmap (see Example 2-1), or it can be configured with repetition of the 10-bit bitmap (see Example 2-2). Alternatively, if the size of the predetermined duration is set to P... step =P (that is, if the size of the predetermined duration is set to be equal to the resource reservation interval), then the sensing reference resource determiner 1817 can use a 10-bit bitmap corresponding to a total of 10 predetermined durations relative to T = T o ·i=T o ·(P step ' / P stepThe corresponding duration is used to determine the sensing reference resource (see Example 2-3). Furthermore, when determining the sensing reference resource, one or a combination of at least two of Examples 2-1, 2-2, and 2-3 above can be applied.

[0319] The PHY layer processing unit 1815 can transmit sensing results about at least one sensing reference resource to the upper layer processing unit 1811 or the SL resource allocation determiner 1812.

[0320] SL data to be sent or retransmitted can be transferred from the upper-layer processing unit 1811 to the PHY layer processing unit 1815, and then sent to the second terminal device 1850. Furthermore, the PHY layer processing unit 1815 can perform transmissions to the second terminal device 1850 on the SL transmission resources determined by the SL resource allocation determiner 1812. Specifically, the PHY layer processing unit 1815 can generate an SCI, which can be sent to the second terminal device 1850 via the PSCCH, and SL data can be sent to the second terminal device 1850 on the resources indicated by the SCI via the PSSCH.

[0321] The second terminal device 1850 may include a processor 1860, an antenna device 1870, a transceiver 1880, and a memory 1890.

[0322] The processor 1860 can perform baseband-related signal processing and may include an upper-layer processing unit 1861 and a PHY layer processing unit 1865. The upper-layer processing unit 1861 can handle MAC layer, RRC layer, or other upper-layer operations. The PHY layer processing unit 1865 can handle PHY layer operations (e.g., downlink receive signal processing, uplink transmit signal processing, sidelink transmit signal processing, etc.). In addition to performing baseband-related signal processing, the processor 1860 can also control the overall operation of the second terminal device 1860.

[0323] Antenna device 1870 may include at least one physical antenna. If antenna device 1870 includes multiple antennas, it may support MIMO transmission and reception. Transceiver 1880 may include an RF transmitter and an RF receiver. Memory 1890 may store operation processing information associated with the operation of processor 1860, software, OS, applications, etc., related to the operation of the second terminal device 1850, and may include components such as buffers.

[0324] The processor 1860 of the second terminal device 1850 can be configured to implement the operation of side-link receiving UE (or second terminal) in the example described herein.

[0325] For example, the upper-layer processing unit 1861 of the processor 1860 of the second terminal device 1850 may include an SL resource allocation determiner 1862.

[0326] The SL resource allocation determiner 1862 can determine the resources used for SL data reception based on the SL resource allocation information provided from the first terminal device 1800.

[0327] SL data sent or retransmitted from the first terminal device 1800 can be received by the PHY layer processing unit 1865. Specifically, the PHY layer processing unit 1865 can receive the first SCI and the second SCI from the first terminal device 1800 according to a dynamic resource allocation method or a configured authorization method, and can receive SL data from the first terminal device 1800 on the resources indicated by the first SCI and the second SCI.

[0328] The same descriptions relating to the sidelink transmitting UE and the sidelink receiving UE in the examples of this invention can be equivalently applied to the operation of the first terminal device 1800 and the second terminal device 1850, and repeated descriptions are omitted here.

[0329] Below, examples relating to resource exclusion in the sensing process in an NR side link according to this disclosure are described.

[0330] The following examples can also be applied to full sensing and partial sensing in NR side links.

[0331] First, the TB retransmission operation in the NR side link is described. In the example above, TB retransmission refers to a situation where, after the initial transmission of the first TB is performed in TTI m+c (or TTI m+d), if N... max =2, then the same first TB is retransmitted in TTI m+e. For example, if N max If N = 3, then the initial transmission of the first TB can be performed in TTI m+c (or TTI m+d), the first retransmission of the same first TB can be performed in TTI m+e, and the second retransmission of the same first TB can be performed in TTI m+f. Simultaneously, the initial transmission of the second TB can be performed in TTI m+c' (or TTI m+d'), and according to N... max The value allows for the first retransmission of the same second TB in TTI m+e', and the second retransmission of the same second TB in TTI m+f'.

[0332] Here, the timing of the initial transmission (or first transmission) and the first retransmission (or second transmission) of the same TB can be determined based on the time slot of the SCI transmission (e.g., time slot n). Additionally, the timing of the second retransmission (or third transmission) can be determined.

[0333] Regarding retransmission timing, SCI can include retransmission time slot information and retransmission index information. For example, the retransmission time slot information can correspond to a 4-bit, 5-bit, or 9-bit field "Time slot between initial transmission and retransmission". Furthermore, the retransmission index information can correspond to a 1-bit or 2-bit field "Retransmission Index".

[0334] The gap parameter (e.g., SF) can be indicated by the field "Time gap between initial transmission and retransmission". gap The gap parameter can refer to the value of (or Gap1, or Gap1 and Gap2). It can be a parameter relating to the gap between the initial transmission (or first transmission), first retransmission (or second transmission), and second retransmission (or third transmission) of a corresponding TB based on reference timing (e.g., time unit (slot or subframe) index n). If the gap parameter = 0, it can indicate that there is no retransmission for the corresponding TB. If the gap parameter ≠ 0, it can indicate that there is a retransmission of the corresponding TB. Here, the value of the gap parameter can be set to the same for the initial transmission, first retransmission, and second retransmission of the same TB.

[0335] Here, the reference timing (e.g., subframe n or time slot n) may correspond to the timing of the first UE (i.e., the sidelink transmitting UE) transmitting the SCI or the timing of the second UE (i.e., the sidelink receiving UE) receiving the SCI. In the following description, the timing of transmitting the SCI from the perspective of the first UE can be used instead of the timing based on receiving the SCI from the perspective of the second UE. Here, it is assumed that the timing of transmitting or receiving the SCI (e.g., TTI m+c) and the timing of transmitting or receiving the TB (TTI m+d) are included in the same time unit (e.g., subframe or time slot).

[0336] The "Retransmission Index" field can indicate the initial transmission (or first transmission), first retransmission (or second transmission), or second retransmission (or third transmission) for the corresponding TB.

[0337] For example, when supporting at most one retransmission for the same TB, the initial transmission and retransmission timing can be determined based on the retransmission time slot information and the retransmission index information, as shown in Table 10 below.

[0338] [Table 10]

[0339]

[0340] In the example in Table 10, if the "time gap between initial transmission and retransmission" indicated by the SCI received in subframe n is SF gapA value of 0 indicates that no retransmissions exist. Furthermore, if the value of the "Retransmission Index" field within the SCI is 0, it can indicate an initial transmission. Therefore, it can indicate the existence of an initial transmission (TB) in subframe n. This is unless the "Time Gap Between Initial Transmission and Retransmission" within the SCI received in subframe n indicates an SF. gap The value is 0; otherwise, it indicates that a retransmission has occurred, and the gap between the initial transmission and the retransmission is SF. gap Furthermore, if the value of the "Retransmission Index" field within the SCI is 0, it can indicate an initial transmission. Therefore, it can indicate an initial transmission with a TB in subframe n and a retransmission with a SF in subframe n+SF. gap There will be retransmissions of the same TB in subframe n. Furthermore, if the value of the "Retransmission Index" field within the SCI is 1, it can indicate a retransmission. Therefore, it can indicate that there is a retransmission of TB in subframe n, and in subframe n-SF... gap There is an initial transfer of the same TB.

[0341] Reference Figure 19 Describes the retransmission timing in the case of supporting a maximum of two retransmissions of the same TB.

[0342] Figure 19 This illustrates a retransmission method to which this disclosure can be applied.

[0343] Figure 19 (a) illustrates an example of using retransmission index information to indicate the timing of the initial transmission, first retransmission, and second retransmission of the same TB.

[0344] When an initial transmission and one retransmission are set (e.g., if N...), max =2), the timing of the initial transmission and retransmission can be determined based on the retransmission time gap information and the retransmission index information, as shown in Table 11.

[0345] [Table 11]

[0346]

[0347] In the example in Table 11, Gap1 corresponds to the gap between the initial transmission and the first retransmission. Gap1 can be indicated by a value from 0 to 31 via the 5-bit field "Gap between initial transmission and retransmission". Here, if Gap1 = 0, it indicates that no retransmission occurred. If a retransmission occurred, Gap1 can have a value from 1 to 31. If the value of Gap1 indicated by "Gap between initial transmission and retransmission" in the SCI received in time slot n is 0, it indicates that no first retransmission occurred. If the value of the "Retransmission Index" field in the SCI is 0, it can indicate an initial transmission. Therefore, it can indicate that an initial transmission of TB occurred in time slot n.

[0348] Unless the value of Gap1, indicated by the "Time Gap Between Initial Transmission and Retransmission" field within the SCI received in time slot n, is 0, it can indicate the existence of a first retransmission, and that the gap between the initial transmission and the first retransmission is Gap1. If the value of the "Retransmission Index" field within the SCI is 0, it can indicate the initial transmission. Therefore, it can indicate that the initial transmission of the TB exists in time slot n, and the first retransmission of the same TB will exist in time slot n+Gap1. Furthermore, if the value of the "Retransmission Index" field within the SCI is 1, it can indicate the first retransmission. Therefore, it can indicate that the first transmission of the TB exists in time slot n, and the initial retransmission of the same TB exists in time slot n-Gap1.

[0349] When an initial transmission and two retransmissions are set (e.g., if N...), max =3), the timing of the initial transmission, the first retransmission and the second retransmission can be determined based on the retransmission time gap information and the retransmission index information, as shown in Table 12.

[0350] [Table 12]

[0351]

[0352]

[0353] exist Figure 12In the example, Gap1 corresponds to the gap between the initial transmission and the first retransmission, while Gap2 corresponds to the gap between the initial transmission and the second retransmission. The values ​​of Gap1 and Gap2 can be indicated by a single 9-bit field, "Gap between initial transmission and retransmission". For example, the 5 bits of the least significant bit (LSB) of the "Gap between initial transmission and retransmission" field can indicate the value of Gap1. Here, if both Gap1 and Gap2 = 0, it can indicate that no retransmission occurs. If Gap1 ≠ 0 and Gap2 = 0, it can indicate that a first retransmission occurs. In this case, Gap1 can have a single value between 1 and 31, and if each of Gap1 and Gap2 ≠ 0, it can indicate that both a first and a second retransmission occur. In this case, since the second retransmission is performed after the first retransmission, Gap2 can always be greater than Gap1. Gap1 and Gap2 can have non-overlapping values ​​between 1 and 31, therefore, the value of the 9-bit field "Time Gap Between Initial Transmission and Retransmission" can indicate one of 465 combinations of Gap1 and Gap2. If all Gap1 and Gap2 values ​​indicated by "Time Gap Between Initial Transmission and Retransmission" within the SCI received in time slot n are 0, it can indicate that no retransmission occurred. If the value of the field "Retransmission Index" within the SCI is 00, it can indicate an initial transmission. Therefore, it can indicate that an initial transmission of TB occurred in time slot n.

[0354] If the value of Gap1, indicated by the "Time Gap Between Initial Transmission and Retransmission" field in the SCI received in time slot n, is not 0 and the value of Gap2 is 0, then it indicates the existence of a first retransmission, and the gap between the initial transmission and the first retransmission is Gap1. If the value of the "Retransmission Index" field in the SCI is 00, it can indicate the initial transmission. Therefore, it can indicate that the initial transmission of the TB exists in time slot n, and the first retransmission of the same TB will exist in time slot n+Gap1. Furthermore, if the value of the "Retransmission Index" field in the SCI is 01, it can indicate the first retransmission. Therefore, it can indicate that the first transmission of the TB exists in time slot n, and the initial retransmission of the same TB exists in time slot n-Gap1.

[0355] Unless each of the values ​​of Gap1 and Gap2 indicated by the "Time Gap Between Initial Transmission and Retransmission" within the SCI received in time slot n is 0, it can indicate the existence of a first retransmission and a second retransmission, with the gap between the initial transmission and the first retransmission being Gap1 and the gap between the initial transmission and the second retransmission being Gap2. If the value of the "Retransmission Index" field within the SCI is 00, it can indicate an initial transmission. Therefore, it can indicate that the initial transmission of a TB exists in time slot n, and the first retransmission of the same TB can exist in time slot n+Gap1, and the second retransmission of the same TB can exist in time slot n+Gap2. Furthermore, if the value of the "Retransmission Index" field within the SCI is 01, it can indicate a first retransmission. Therefore, it can indicate that the first transmission of a TB exists in time slot n, the initial retransmission of the same TB exists in time slot n-Gap1, and the second retransmission of the same TB will exist in time slot n+Gap2-Gap1. If the value of the "Retransmission Index" field within the SCI is 10, it can indicate a second retransmission. Therefore, it can indicate a second retransmission with a TB in time slot n, an initial transmission with the same TB in time slot n-Gap2, and a first retransmission with the same TB in time slot n+Gap1-Gap2.

[0356] Figure 19 (b) illustrates an example of indicating the timing of the initial transmission, first retransmission, and second retransmission of the same TB without using retransmission index information. In this case, the initial transmission, first retransmission, and second retransmission of the same TB can be identified based on new data indication information.

[0357] New Data Indication (NDI) information can be defined as a 1-bit New Data Indicator (NDI) field and included in the SCI. In the case of retransmission of the same TB, the NDI value may not be switched, while in the case of transmission of a new TB, the NDI value may be switched. For example, if the NDI value of a TB included in the SCI is 1 (or 0), and the NDI value included in the previous SCI is 0 (or 1), it can indicate the initial transmission of a new TB; and if the NDI value included in the previous SCI is 1 (or 0), it can indicate a retransmission of the same TB.

[0358] When an initial transmission and one retransmission are set (e.g., if N...), max =2), the timing of the initial transmission and the first retransmission can be determined based on the retransmission time gap information and the new data indication information, as shown in Table 13.

[0359] [Table 13]

[0360]

[0361] In the example in Table 13, the explanation of Gap1 is the same as in Table 11, so further description is omitted. If the value of Gap1, indicated by the "Time Gap Between Initial Transmission and Retransmission" within the SCI received in time slot n, is 0, it can indicate that there is no first retransmission. Therefore, it can indicate that the initial transmission of TB occurred in time slot n. In this case, the "NDI" value of the SCI can have a different value than the NDI value of the previous SCI.

[0362] Unless the value of Gap1, indicated by the "Gap between initial transmission and retransmission" within the SCI received in time slot n, is 0, it can indicate the existence of a first retransmission, and that the gap between the initial transmission and the first retransmission is Gap1. It can indicate an initial transmission when the value of the "NDI" field within the SCI is switched compared to the NDI value of a previous SCI. Therefore, it can indicate that the initial transmission of a TB exists in time slot n, and the first retransmission of the same TB exists in time slot n+Gap1. In this case, the "NDI" value of the SCI received in time slot n can have a different value than the NDI value of a previous SCI, and the "NDI" value of the SCI received in time slot n+Gap1 can have the same value as the NDI value of a previous SCI (i.e., the SCI received in time slot n).

[0363] When an initial transmission and two retransmissions are set (e.g., if N...), max =3), the timing of the initial transmission, the first retransmission and the second retransmission can be determined based on the retransmission time gap information and the new data indication information, as shown in Table 14.

[0364] [Table 14]

[0365]

[0366] In the example in Table 14, the explanations for Gap1 and Gap2 are the same as in Table 13, so further descriptions are omitted. If all the values ​​of Gap1 and Gap2 indicated by the "Time Gap Between Initial Transmission and Retransmission" within the SCI received in time slot n are 0, it can indicate that no retransmission occurred. Therefore, it can indicate that the initial transmission of TB occurred in time slot n. In this case, the "NDI" value of the SCI can have a different value than the NDI value of the previous SCI.

[0367] If the value of Gap1, indicated by the "time gap between initial transmission and retransmission" within an SCI received in time slot n, is not equal to 0, and Gap2 = 0, then it can indicate the existence of a first retransmission, and the gap between the initial transmission and the first retransmission is Gap1. Therefore, it can indicate that the initial transmission of a TB exists in time slot n, and the first retransmission of the same TB exists in time slot n+Gap1. In this case, the "NDI" value of the SCI received in time slot n can have a different value than the NDI value of the previous SCI, and the "NDI" value of the SCI received in time slot n+Gap1 can have the same value as the NDI value of the previous SCI (i.e., the SCI received in time slot n).

[0368] Unless each of the values ​​of Gap1 and Gap2, indicated by the "time gap between initial transmission and retransmission" within the SCI received in time slot n, is 0, it can indicate the existence of a first retransmission and a second retransmission, with the gap between the initial transmission and the first retransmission being Gap1 and the gap between the initial transmission and the second retransmission being Gap2. Therefore, it can indicate that the initial transmission of a TB exists in time slot n, the first retransmission of the same TB exists in time slot n+Gap1, and the second retransmission of the same TB exists in time slot n+Gap2. In this case, the NDI value of the SCI received in time slot n can be different from the NDI value of the previous SCI, the NDI value of the SCI received in time slot n+Gap1 can be the same as the NDI value of the previous SCI (i.e., the SCI received in time slot n), and the NDI value of the SCI received in time slot n+Gap2 can be the same as the NDI value of the previous SCI (i.e., the SCI received in time slot n+Gap1).

[0369] Table 15 shows Figure 17 Examples of detailed procedures for some sensing operations described in S1710 to S1740.

[0370] [Table 15]

[0371]

[0372]

[0373]

[0374] In step 1), the first UE can obtain a resource pool (i.e., a portion of the sensing unit duration, referenced from the resource region corresponding to the Y time slots) from the resource pool. Figure 17 In operation S1710), select time slot y (i.e., the target to be sensed, reference). Figure 17(Operation S1720). For details regarding the Y time slots and time slot y, please refer to [reference needed]. Figure 12 The content described.

[0375] In step 2), the first UE can perform a pair of yk*P (or yk*P) for the time slot y (i.e., the resource to be sensed) selected in step 1. step ') corresponding to all time slots (i.e., at least one sensing reference resource, reference Figure 17 The operation S1730) performs monitoring (or sensing). Here, regarding yk*P (or yk*P...), step For details regarding the corresponding time slot, please refer to [reference needed]. Figure 12 The content explained in the document.

[0376] In step 3), the first UE can determine the threshold to be used for resource exclusion (i.e., step 5).

[0377] In step 4), the first UE can set a set S of candidate single time unit (subframe or time slot) resources (or candidate resources to be sensed). A and resource set S B Here, S A This represents the set of all possible candidate single-time resources. A candidate single-time unit resource (or candidate single subframe / slot resource) can be expressed as R. x,y Here, y represents the time slot y as the resource to be sensed, and x corresponds to the frequency axis resource in time slot y. Here, S... B It can be initially set to an empty set.

[0378] Step 5) can be referred to as the resource exclusion step. The first UE can exclude time slots that satisfy specific conditions regarding all Y possible values ​​of a resource pool, which belongs to a resource area corresponding to the Y time slots. For example, when the first UE receives an SCI from one or more third UEs (e.g., when the first UE receives an SCI sent from the third UE to the first UE, or when the first UE hears an SCI sent from the third UE to another UE), the first UE can determine whether the transmission scheduled by the SCI exceeds a predetermined threshold. Here, the one or more third UEs can be at least one UE adjacent to the first UE. For example, the one or more third UEs can include a second UE that wants to send sidelink data, and can also include other UEs besides the second UE.

[0379] If the number of transmissions scheduled by the SCI of the third UE exceeds a predetermined threshold, it can be assumed that the transmissions of the third UE can be performed on resources scheduled and / or reserved by the SCI. Based on the above assumption, the first UE can exclude the time slot y for which the third UE has reserved resources from the resource pool belonging to the resource region corresponding to the Y time slots. Therefore, some candidate single subframe / time slot resources can be obtained from SCI. A Excluded from the list.

[0380] In step 6), if it belongs to S after applying resource exclusion... A If the number of candidate single-frame / slot resources does not meet a predetermined threshold, steps 3) and 4) can be repeated. For example, if the number of candidate single-frame / slot resources belonging to SA after resource exclusion is less than 0.2M total (Here, M) total If the total number of candidate single subframes / slot resources is 3dB, then step 4) can be repeated by increasing the threshold determined in step 3). This process can be repeated until S is reached. A The number of candidate subframes / slot resources becomes greater than or equal to 0.2M total And S can be finally determined A .

[0381] In step 7), the first UE can, for example, target the S determined in step 6. A For each of the candidate subframes / slot resources, relative to yk*P (or yk*P) in step 2 step E is calculated by averaging the monitored (or sensed) values ​​of all corresponding time slots (i.e., sensed reference resources). x,y .

[0382] In step 8), the first UE can proceed according to the E calculated in step 7. x,y The candidate single-subframe / slot resources are selected from set S in descending order of their values. A Move to set S B It can execute from set S A To set S B The movement continues until it belongs to S. B The number of candidate subframes / slot resources becomes 0.2M. total .

[0383] In step 9), the first UE can report the finalized set S to the upper layer. B .

[0384] Based on the partial sensing results reported to the upper layer, the resources used for the first UE to transmit sidelink data can be determined. If the first UE is operating in eNodeB resource scheduling mode, the partial sensing results can be delivered to the eNodeB, and the eNodeB can determine the sidelink transmission resources and indicate those sidelink transmission resources to the first UE.

[0385] In the above-mentioned sensing procedure, step 5), namely the resource exclusion step, will be described further.

[0386] In step 5-1), the first UE can receive the SCI from the third UE in time slot m. Here, the resource reservation field in the SCI can indicate the parameter value P. rsvp_RX Furthermore, the priority field in SCI can indicate the value prio. RX .

[0387] In step 5-2), if the PSSCH-RSRP measurement corresponding to the SCI (i.e., the data channel used to schedule by the SCI) exceeds the threshold Th prioTX,prioRX If so, the first UE can identify the corresponding resource as an exclusion candidate.

[0388] In step 5-3), the first UE can determine whether the resources (i.e., exclusion candidates) periodically reserved for the third UE's transmission from time slot m overlap with the resources (i.e., candidate resources to be sensed) periodically reserved for transmission from time slot y. When the exclusion candidate overlaps with the candidate resources to be sensed, the corresponding resource S A It can be excluded.

[0389] Here, time slot m corresponds to t in Table 15 above. SL m The resources periodically reserved for transmission from time slot m correspond to t in Table 15 above. SL m+q×Pstep×Prsvp_RX (or,t) SL m+q×Pstep'×Prsvp_RX The resources that can be periodically reserved for transmission in time slot y and from time slot y correspond to R in Table 15 above. x,y+j×P'rsvp_TX .

[0390] This resource exclusion step can be applied equally to both full and partial sensing. For example, the time slot y in the resource exclusion step is not limited to the duration Y of the partial sensing unit, and can be extended to, for example... Figure 11 All possible time slots for the entire duration of [TTI m+T1, TTI m+T2]. For clarity of description, the examples of resource exclusion in this disclosure are described under the assumption of partial sensing, which can be equally applied to security sensing.

[0391] Figure 20 An example of a resource exclusion process to which this disclosure can be applied is shown.

[0392] Figure 20 An example of step 5-3 above is shown.

[0393] Figure 20 Example (a) assumes a case where SCS = 15 kHz, q = 1, P step =100ms,P rsvp_RX =1 and P' rsvp_TX =P step ·P rsvp_TX =100ms. Therefore, in the resources related to the resource exclusion step, time slot m can be represented as t. SL m The resources periodically reserved for transmission from time slot m can be represented as t. SL m+q×Pstep×Prsvp_RX =t SL m+100 Furthermore, time slot y and the resources periodically reservable from time slot y can be represented as R. x,y+j×P'rsvp_TX =R x,y ,R x,y+100 ,...,R x,y+100·(Cresel-1) .

[0394] according to Figure 20 In example (a), since time slot m+100 and time slot y overlap, the resource corresponding to time slot y is excluded from the Y time slots (i.e., the (partial) duration of the sensing unit).

[0395] Figure 20 Example (b) assumes a case where SCS = 15 kHz, q = {1, 2, 3, 4, 5}, P step =100ms,P rsvp_RX =0.2 and P' rsvp_TX =P step ·P rsvp_TX =20ms. Therefore, in the resources related to the resource exclusion step, time slot m can be expressed as t. SL m The resources periodically reserved for transmission from time slot m can be represented as t. SL m+q×Pstep×Prsvp_RX =t SL m+20 ,t SL m+40 ,t SL m+60 ,t SL m+80 ,t SL m+100Furthermore, the resources that can be periodically reserved for transmission from time slot y and from time slot y can be represented as R. x,y+j×P'rsvp_TX =R x,y ,R x,y+20 ,R x,y+40 ,R x,y+60 ,R x,y+80 ,R x,y+100 ,R x,y+120 ,R x,y+140 ,...,R x,y+20·(Cresel-1) .

[0396] according to Figure 20 In example (b), although time slots m+20, m+40, m+60, and m+80 do not overlap with time slot y, time slot m+100 does overlap with time slot y. Therefore, resources corresponding to time slot y are excluded from the Y time slots (i.e., the (partial) duration of the sensing unit).

[0397] exist Figure 20 In the example, the resource corresponding to slot m is represented as t. SL m However, in addition, if Figure 20 In (b), the resource corresponding to time slot m+20 is t. SL m Then the resources corresponding to time slot y+20 can also be excluded from the same resource exclusion operation. Figure 20 The duration Y in (b) is excluded.

[0398] As described above, when the first UE excludes candidate resources to be sensed, if any of the resources used by the first UE to receive the SCI from the third UE (i.e., time slot m) and the resources reserved by the SCI within the resources exceeding a predetermined threshold (i.e., resources periodically reserved from time slot m for transmission) overlap with any of the first UE's candidate resources to be sensed and associated resources (i.e., time slot y and resources periodically reserved from time slot y for transmission), then the first UE can exclude the corresponding candidate resource to be sensed (i.e., time slot y) from the resources to be sensed.

[0399] Figure 21 Additional examples of resource exclusion processes to which this disclosure can be applied are shown.

[0400] Figure 21 The example assumes a case where SCS = 15 kHz, q = 1, P step =100ms,P rsvp_RX =1, and P' rsvp_TX =P step ·P rsvp_TX =100ms.

[0401] exist Figure 20In the example, the resources periodically reserved by the SCI of the third UE in time slot m can be used to transmit another TB. That is, in Figure 20 In the example, each of time slots m, m+20, m+40, ..., m+100 can be periodically reserved for transmitting a new TB. That is, in the resource exclusion process, resources used for transmitting the same TB sent by the SCI reserved in time slot m are not considered.

[0402] like Figure 21 As in example (a), the initial transmission of the third UE's SCI and the TB scheduled by the SCI can be performed in time slot m, and the retransmission of the same TB can be performed in time slot m+Gap. If the time interval between time slot m and time slot m+Gap is relatively small, the probability that the retransmission of the third UE in time slot m+Gap will overlap with any time slot y within the duration Y of the first UE may be reduced. Therefore, although resources used for retransmission are not considered in the resource exclusion process, this may not be a major issue.

[0403] Furthermore, when the time interval between time slot m and time slot m+Gap is relatively large, the probability of a retransmission by the third UE in time slot m+Gap overlapping with any time slot y within the duration Y of the first UE may increase. Even in this case, if the resources used for the retransmission of a TB by the third UE in time slot m+Gap are included in the periodic resources reserved by the third UE in time slot m (for sending another TB), the corresponding resources can be excluded by the first UE, so this may not be a major problem.

[0404] For example, such as Figure 21 As in example (b), the initial transmission of the third UE's TB in time slot m and the retransmission of the same TB in time slot m+Gap can be repeated periodically. In this case, when the retransmission of the third UE in the previous period (i.e., the retransmission of the first TB in time slot m-100+Gap) is verified, it repeats periodically, and therefore, it can be determined that the retransmission of the second TB of the third UE in the subsequent period (i.e., the retransmission of the second TB in time slot m+Gap) will exist. That is, when the transmission of the third UE in time slot m-100+Gap is verified (here, transmission refers to any transmission, including all cases of initial transmission and retransmission), periodic resources after time slot m-100+Gap can be excluded. Therefore, it is not necessary to separately verify whether the retransmission of the third UE exists in time slot m+Gap. Therefore, when a transmission / retransmission is performed in the time slot m-100+Gap of the third UE, subsequent periodic resources (here, including resources on which retransmissions in the time slot m+Gap are performed) overlap with any time slot y within the duration Y of the first UE, the corresponding resources can be excluded.

[0405] That is, in Figure 21 In example (b), when the resource corresponding to slot m-100+Gap is t SL m At that time, the resource corresponding to time slot m+Gap can be t. SL m+100 As per the above reference. Figure 20 As stated above, resources corresponding to time slot m+Gap can be excluded from the duration Y.

[0406] Figure 22 Additional examples of resource exclusion processes to which this disclosure can be applied are shown.

[0407] Figure 22 An example could be considered where the time interval between the initial transmission and retransmission in time slot m and time slot m+Gap of the third UE is relatively large (i.e., retransmissions in time slot m+Gap and any time slot y in duration Y may overlap), and the initial transmission in time slot m and retransmission in time slot m+Gap of the third UE are not periodically repeated (e.g., aperiodic sidechain transmission). In this case, although the time slot m+Gap resources for the retransmission of the third UE overlap with any time slot y in the duration Y of the first UE, the corresponding resources may not be excluded, and a severe performance degradation may occur.

[0408] For example, when a third UE performs aperiodic sidelink transmission, the initial transmission of the third UE's TB can be performed in time slot m. When the same TB is retransmitted in time slot m+Gap, the resources of time slot m+Gap that serve as the resources for performing the retransmission may not have a periodic relationship with any transmission of the third UE at a previous time point in time slot m.

[0409] In this scenario, time slot m can be before the first UE's selection / reselection time point, and time slot m+Gap can be after the first UE's selection / reselection time point, and can belong to duration Y. According to the currently defined resource exclusion method, in this case, since the third UE's TB retransmission in time slot m+Gap is not excluded from the first UE's sensing process, the first UE may select resources that may overlap with the third UE's transmission.

[0410] Hereinafter, examples of this disclosure are described in detail, wherein resources in which the initial transmission and retransmission of a third UE are performed can be excluded from the resource exclusion step of the sensing process of the first UE. As described above, the following resource exclusion method can be applied even for full sensing and partial sensing.

[0411] Example 3

[0412] In this example, the first UE determines the retransmission resources of the third UE based on the retransmission index information within the third UE's SCI, and excludes the determined resources from the resources to be sensed by the first UE. For example, the first UE can determine additional exclusion candidates by referring to the retransmission time slot information and retransmission index information within the third UE's SCI in the resource exclusion operation described in Reference Table 15 above.

[0413] The first UE can receive the SCI of the third UE in time slot m. Here, the resource reservation field within the SCI can indicate the parameter value P. rsvp_RX Furthermore, the priority field within SCI can indicate the value prio. RX In addition, retransmission time gap information within the SCI (e.g., the field "Time gap between initial transmission and retransmission") can indicate the parameter value "Gap", and retransmission index information (e.g., the field "Retransmission Index") can indicate the parameter value "Retransmission Index".

[0414] If the PSSCH-RSRP measurement corresponding to the SCI (i.e., the data channel used to schedule data by the SCI) exceeds the threshold Th prioTX,prioRX If so, the first UE can identify the corresponding resource as an exclusion candidate.

[0415] The first UE can determine, based on the SCI received from the third UE in time slot m, whether time slot m and the resources periodically reserved from time slot m for transmissions performed by the third UE (i.e., the first exclusion candidate) overlap with time slot y and the resources periodically reserved for transmission (i.e., the candidate resources to be sensed and the associated resources). Additionally, the first UE can determine, based on the SCI received from the third UE in time slot m, whether time slot m and the resources periodically reserved for retransmissions of the same TB in time slot m+Gap (i.e., the second exclusion candidate) overlap with time slot y and the resources periodically reserved from time slot y for transmission (i.e., the candidate resources to be sensed and the associated resources). If the first and / or second exclusion candidates overlap with the resources to be sensed and the associated resources, the corresponding resources can be excluded from the SCI. A exclude.

[0416] Here, the time slot m, which is the first candidate to be excluded, corresponds to t. SL m Furthermore, the resources periodically reserved for transmission from time slot m correspond to t. SL m+q×Pstep×Prsvp_RX (or,t) SL m+q×Pstep'×Prsvp_RX The second exclusion candidate, namely, the resources reserved for retransmission of the same TB in time slot m+Gap as the TB sent in time slot m, corresponding to t SL m+GapThe candidate resources to be sensed and the associated resources, i.e., the resources that can be periodically reserved for transmission from time slot y and from time slot y, correspond to R. x,y+j×P'rsvp_TX .

[0417] That is, in the resource exclusion step described in step 5) of reference Table 15, it can be determined whether the first exclusion candidate, the candidate resource to be sensed, and the associated resource overlap, and the overlapping resources can be excluded from the duration Y. Additionally, this example can determine whether the second exclusion candidate, the candidate resource to be sensed, and the associated resource overlap, and the overlapping resources can be excluded from the duration Y.

[0418] As an additional example, the second exclusion candidate may include retransmission resources associated with the initial transmission in the first exclusion candidate. Therefore, the second exclusion candidate can be expressed as a first exclusion candidate that includes retransmissions.

[0419] That is, including the first exclusion candidate for retransmission, i.e., time slot m + Gap (here, if Gap = 0, then it is time slot m), corresponding to t SL m+Gap Similarly, the resources periodically reserved for transmission from time slot m + Gap (or time slot m if Gap = 0) correspond to t. SL m+Gap+q×Pstep×Prsvp_RX (or,t) SL m+q×Pstep'×Prsvp_RX The candidate resources to be sensed and the associated resources, i.e., the resources that can be periodically reserved for transmission from time slot y and from time slot y, correspond to R. x,y+j×P'rsvp_TX .

[0420] Example 3-1

[0421] In the example above, the parameter value "gap" indicated by the retransmission time gap information of the SCI received by the first UE in time slot m (e.g., the time gap between the initial transmission and retransmission field) can be defined in Tables 16 and 17 below, which is consistent with the above reference. Figure 19 The descriptions are similar.

[0422] The resources specified based on the parameter value "gap" and the resources periodically reserved for transmission after the corresponding resources can be identified as exclusion candidates. When an exclusion candidate overlaps with the candidate resource to be sensed and its associated resources, the corresponding resource can be excluded.

[0423] When setting initial transmission and one retransmission for a third UE (e.g., if N... max =2), the timing of the initial transmission and the first retransmission of the third UE can be determined based on the retransmission time interval information and retransmission index information in the SCI, as shown in Table 16.

[0424] [Table 16]

[0425]

[0426] In the example in Table 16, Gap1 corresponds to the gap between the initial transmission and the first retransmission of the third UE. The value of Gap1 can be indicated by the field "Time gap between initial transmission and retransmission". If Gap1 = 0, then the parameter value "Gap" = 0.

[0427] If Gap1≠0, then for a value where the field “retransmission index” = 0, the parameter value “Gap” is Gap1, and for a value where the field “retransmission index” = 1, the parameter value “Gap” is -Gap1.

[0428] Therefore, the first UE can identify time slot m+Gap (here, one of Gap=0, Gap=Gap1 and Gap=-Gap1) and the resources periodically reserved from time slot m+Gap for transmission as exclusion candidates, and if the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources, the corresponding resources can be excluded.

[0429] When setting up initial transmission and two retransmissions for a third UE (e.g., if N... max =3), the timing of the initial transmission, first retransmission and second retransmission of the third UE can be determined based on the retransmission time gap information and retransmission index information, as shown in Table 17.

[0430] [Table 17]

[0431]

[0432] In the example in Table 17, Gap1 corresponds to the gap between the initial transmission and the first retransmission of the third UE, while Gap2 corresponds to the gap between the initial transmission and the second retransmission. The values ​​of Gap1 and Gap2 can be indicated by the field "Time gap between initial transmission and retransmission". If all values ​​of Gap1 and Gap2 are = 0, the parameter value "Gap" is 0. That is, the first UE can determine whether the initial transmission resource (or exclusion candidate) overlaps with the candidate resource to be sensed and the associated resource of the first UE based on the parameter value "Gap".

[0433] If Gap1≠0 and Gap2=0, then for the field "Retransmission Index" with a value of 00, the parameter value "Gap" is Gap1, and for the field "Retransmission Index" with a value of 01, the parameter value "Gap" is -Gap1. That is, the first UE can determine whether the retransmission resource (or exclusion candidate) overlaps with the first UE's candidate resources to be sensed and associated resources based on the parameter value "Gap".

[0434] If each of the values ​​of Gap1 and Gap2 is not equal to 0 and the value of the field "Retransmission Index" is 00, then the parameter value "Gap" has two values, Gap1 and Gap2. That is, the first UE can determine whether all retransmission resources (or exclusion candidates) of the third UE overlap with the first UE's candidate resources to be sensed and associated resources based on the two parameter values ​​"GAP".

[0435] If each of the values ​​of Gap1 and Gap2 is not equal to 0, and the value of the field "Retransmission Index" is 01, then the parameter value "Gap" has two values: -Gap1 and Gap2-Gap1. That is, the first UE can determine whether all retransmission resources (or exclusion candidates) of the third UE overlap with the first UE's candidate resources to be sensed and associated resources based on these two parameter values ​​"Gap".

[0436] If each of the values ​​of Gap1 and Gap2 is not equal to 0, and the value of the field "Retransmission Index" is 01, then the parameter value "Gap" has two values: -Gap2 and Gap1-Gap2. That is, the first UE can determine whether all retransmission resources (or exclusion candidates) of the third UE overlap with the first UE's candidate resources to be sensed and associated resources based on these two parameter values ​​"Gap".

[0437] Therefore, the first UE can determine time slot m+Gap (here, Gap=0, Gap=Gap1, Gap=-Gap1, Gap=Gap1 and Gap2, Gap=-Gap1 and Gap2-Gap1, and Gap=-Gap2 and Gap1-Gap2) and periodically reserve resources for transmission from time slot m+Gap as exclusion candidates, and when the determined exclusion candidates overlap with the candidate resources to be sensed and the associated resources, the corresponding resources can be excluded.

[0438] For example, Example 3-1 can be applied when the initial transmission and retransmission (or the first and second retransmission) of the same TB by the third UE do not repeat periodically.

[0439] Example 3-2

[0440] Similar to Figure 21 For example, when the initial transmission and retransmission (or first retransmission and second retransmission) of a third UE to the same TB are repeated periodically, the exclusion candidate determination operation considering retransmission can be defined more concisely.

[0441] For example, when the first UE receives an SCI for a TB transmission for the third UE in time slot m, time slot m should obviously be included in the candidate resources to be excluded. However, retransmission resources of the same TB after time slot m can be added to the exclusion candidates, while transmissions of the same TB before time slot m can be excluded. Even according to the existing resource exclusion process that does not consider retransmissions, transmissions before time slot m can be excluded due to their periodicity, but according to the existing resource exclusion process that does not consider retransmissions, transmissions after time slot m may not be excluded because they are after the resource selection / reselection time point of the first UE.

[0442] As a detailed example, suppose that the time slot m in which the first UE receives the SCI from the third UE is the first retransmission of the same TB by the third UE. For example, the first UE can verify that the first retransmission of the TB exists in time slot m based on the retransmission time slot information and retransmission index information within the SCI, that the initial transmission of the same TB occurs in time slot m-Gap1, and that the second retransmission of the same TB will occur in time slot m+Gap2-Gap1.

[0443] In this case, regarding time slot m+Gap2-Gap1 and the resources periodically reserved from time slot m+Gap2-Gap1 for transmission by the third UE (i.e., excluded candidates), the first UE can determine whether they overlap with time slot y and the resources periodically reserved from time slot y for transmission (i.e., the candidate resources to be sensed and the associated resources).

[0444] Furthermore, regarding time slot m-Gap1 and the resources periodically reserved from time slot m-Gap1 for transmission by the third UE, the first UE does not need to determine whether they overlap with the candidate resources to be sensed and the associated resources.

[0445] In this regard, we assume that the initial transmission and retransmission of the same TB for the third UE are repeated periodically (e.g., every 100 time slots). That is, the initial transmission of the first TB can be performed in time slot m-100-Gap1, the first retransmission of the first TB can be performed in time slot m-100, and the second retransmission of the first TB can be performed in time slot m-100+Gap2-Gap1. Furthermore, the initial transmission of the second TB can be performed in time slot m-Gap1, the first retransmission of the second TB can be performed in time slot m, and the second retransmission of the second TB can be performed in time slot m+Gap2-Gap1.

[0446] In this scenario, when the first UE receives an SCI from the third UE in the first retransmission resource (e.g., time slot m-100-Gap1) of the first TB in the previous cycle of the third UE, and when the received SCI overlaps with any time slot y (i.e., the candidate resource to be sensed and the associated resource) within the duration Y in subsequent periodic resources (here, including time slot m-Gap1), the first UE may exclude the corresponding resource even without considering time slot m-Gap1 (i.e., it is not even certain whether time slot m-Gap1 and the resources periodically reserved from time slot m-Gap1 for the third UE's transmission overlap with the candidate resource to be sensed and the associated resource).

[0447] Therefore, the parameter value "Gap" indicated by the retransmission time gap information of the SCI received by the first UE in time slot m (e.g., the field "Time gap between initial transmission and retransmission") can be defined as shown in Tables 18 and 19 below. Resources specified according to the parameter value "Gap" and resources periodically reserved for transmission after the corresponding resources can be identified as exclusion candidates. When the identified exclusion candidates overlap with the candidate resources to be sensed and the associated resources, the corresponding resources can be excluded.

[0448] When setting initial transmission and one retransmission for a third UE (e.g., if N... max =2), the timing of the initial transmission and the first retransmission of the third UE can be determined based on the retransmission time interval information and retransmission index information in the SCI, as shown in Table 18.

[0449] [Table 18]

[0450]

[0451] In the examples in Table 18, descriptions that are repeated in the examples in Table 16 are omitted. If Gap1 ≠ 0 and the value of the field “Retransmission Index” is 1, then the parameter value “Gap” is -Gap1. However, when the third UE periodically repeats the transmission and retransmission of the same TB in time slot m and time slot m+Gap, the parameter value “Gap” of the field “Retransmission Index” with a value of 1 can be disregarded. That is, regarding time slot m-Gap1 and the resources periodically reserved from time slot m-Gap1 for the third UE to transmit, the first UE may not need to determine whether they overlap with the candidate resources to be sensed and the associated resources.

[0452] Therefore, the first UE can determine the time slot m+Gap (here, one of Gap=0 and Gap=Gap1) and periodically reserve resources from the time slot m+Gap for transmission as exclusion candidates, and when the exclusion candidate overlaps with the candidate resource to be sensed and the associated resource, the corresponding resource can be excluded.

[0453] When setting up initial transmission and two retransmissions for a third UE (e.g., if N... max =3), the timing of the initial transmission, first retransmission and second retransmission of the third UE can be determined based on the retransmission time gap information and retransmission index information, as shown in Table 19.

[0454] [Table 19]

[0455]

[0456] In the examples in Table 19, descriptions that are repeated in the examples in Table 17 are omitted. If Gap1 ≠ 0 and Gap2 = 0, then for a value of field “Retransmission Index” = 01, the parameter value “gap” is -Gap1. However, when the third UE periodically repeats the transmission and retransmission of the same TB in time slot m and time slot m+Gap, the parameter value “Gap” of field “Retransmission Index” with a value of 01 can be disregarded. That is, regarding time slot m-Gap1 and the resources periodically reserved from time slot m-Gap1 for the third UE to transmit, the first UE may not need to determine whether they overlap with the candidate resources to be sensed and the associated resources.

[0457] If each of the values ​​of Gap1 and Gap2 is not equal to 0, and the value of the field "Retransmission Index" is 01, then the parameter value "Gap" has two values: -Gap1 and Gap2-Gap1. Here, when the third UE periodically repeats the transmission and retransmission of the same TB in time slots m and m+Gap, the case where the parameter value "Gap" is -Gap1 can be disregarded, and only the case where the parameter value "Gap" is Gap2-Gap1 can be considered. That is, regarding time slot m+Gap2-Gap1 and the resources periodically reserved from time slot m+Gap2-Gap1 for transmission by the third UE, the first UE can determine whether they overlap with the candidate resources to be sensed and the associated resources. However, that is, regarding time slot m-Gap1 and the resources periodically reserved from time slot m-Gap1 for transmission by the third UE, the first UE can determine whether they overlap with the candidate resources to be sensed and the associated resources.

[0458] If each of the values ​​of Gap1 and Gap2 is not equal to 0 and the value of the "Retransmission Index" field is 10, then the parameter value "gap" has two values: -Gap2 and Gap1-Gap2. However, when the transmission and retransmission of the same TB by the third UE are periodically repeated in time slots m and m+Gap, the parameter value "Gap" with the value of the "Retransmission Index" field being 10 can be disregarded. That is, for time slot m-Gap2 and the resources periodically reserved from time slot m-Gap2 for the third UE to transmit, and for time slots m+Gap1-Gap2 and the resources periodically reserved from time slot m+Gap1-Gap2 for the third UE to transmit, the first UE does not need to determine whether they overlap with the candidate resources to be sensed and the associated resources.

[0459] Therefore, the first UE can determine time slot m+Gap (where Gap = 0, Gap = Gap1, Gap = Gap1 and Gap2, Gap = Gap2-Gap1) and the resources reserved for the UE to be periodically transmitted from time slot m+Gap as exclusion candidates, and when the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources, the corresponding resources can be excluded.

[0460] Example 3-3

[0461] This example relates to a method that does not include the corresponding resource in the retransmission consideration in the additional consideration of the resource to be excluded, because if Gap=0 (i.e., if there is no retransmission), the corresponding resource is included in the existing resource exclusion operation.

[0462] Therefore, the parameter value "Gap" indicated by the retransmission time gap information of the SCI received by the first UE in time slot m (e.g., the field "Time gap between initial transmission and retransmission") can be defined as shown in Tables 20 and 21 below. Resources specified according to the parameter value "Gap" and resources periodically reserved for transmission after the corresponding resources can be identified as exclusion candidates. When the identified exclusion candidates overlap with the candidate resources to be sensed and the associated resources, the corresponding resources can be excluded.

[0463] When setting initial transmission and one retransmission for a third UE (e.g., if N... max =2), the timing of the initial transmission and the first retransmission of the third UE can be determined based on the retransmission time interval information and retransmission index information in the SCI, as shown in Table 20.

[0464] [Table 20]

[0465]

[0466] In the examples in Table 20, descriptions that are repeated in the examples in Table 16 or Table 18 are omitted. According to the examples in Table 20, the first UE can identify time slot m+Gap (here, Gap = Gap1) and resources periodically reserved from time slot m+Gap for transmission as exclusion candidates, and can exclude the corresponding resources when the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources.

[0467] When setting up initial transmission and two retransmissions for a third UE (e.g., N) max =3), the timing of the initial transmission, first retransmission and second retransmission of the third UE can be determined based on the retransmission time gap information and retransmission index information, as shown in Table 21.

[0468] [Table 21]

[0469]

[0470] In the examples in Table 21, descriptions that repeat the examples in Table 17 or Table 19 are omitted. According to the examples in Table 21, the first UE can identify time slot m+Gap (here, Gap = one of Gap1, Gap = Gap1 and Gap2, Gap = Gap2-Gap1) and resources periodically reserved from time slot m+Gap for transmission by the third UE as exclusion candidates, and when the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources, the corresponding resources can be excluded.

[0471] Example 4

[0472] In this example, the first UE determines the retransmission resources of the third UE without using the retransmission index information within the third UE's SCI, and excludes the determined resources from the first UE's candidate resources to be sensed and associated resources. For example, in the resource exclusion operation described in Table 15, the first UE can determine additional exclusion candidates by referring to the retransmission time slot information within the SCI.

[0473] In Example 3 above, the additional reference information in the SCI of the third UE received from the first UE includes retransmission time gap information (e.g., the field "time gap between initial transmission and retransmission") indicating the parameter value "Gap" and retransmission index information (e.g., the field "retransmission index") indicating the parameter value "retransmission index". In Example 4, only the retransmission time gap information (e.g., the field "time gap between initial transmission and retransmission") indicating the parameter value "Gap" can be referenced additionally, without additionally using the retransmission index information (e.g., the field "retransmission index") indicating the parameter value "retransmission index" in the SCI of the third UE received by the first UE.

[0474] Therefore, except for the lack of reference retransmission index information, the description in Example 3 can also be applied to Example 4, so the repeated description is omitted.

[0475] Example 4-1

[0476] The parameter value “Gap” indicated by the retransmission time gap information of the SCI received by the first UE in time slot m (e.g., the field “time gap between initial transmission and retransmission”) can be defined as shown in Tables 22 and 23 below.

[0477] When setting initial transmission and one retransmission for a third UE (e.g., if N... max =2), the timing of the initial transmission and the first retransmission of the third UE can be determined based on the retransmission time gap information in the SCI, as shown in Table 22.

[0478] [Table 22]

[0479]

[0480] According to the example in Table 22, the first UE can identify time slot m+Gap (here, Gap = 0 or Gap = Gap1) and resources periodically reserved from time slot m+Gap for transmission as exclusion candidates, and can exclude the corresponding resources when the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources. When setting up initial transmission and two retransmissions for the third UE (e.g., if N... max =3), the timing of the initial transmission, first retransmission and second retransmission of the third UE can be determined based on the retransmission time gap information and retransmission index information, as shown in Table 23.

[0481] [Table 23]

[0482]

[0483] According to the example in Table 23, the first UE can identify time slot m+Gap (here, one of Gap=0, Gap=Gap1, Gap=Gap1 and Gap2) and resources periodically reserved from time slot m+Gap for transmission as exclusion candidates, and can exclude the corresponding resources when the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources.

[0484] Example 4-2

[0485] This example relates to a method that does not include the corresponding resource in the retransmission consideration in the additional consideration of the resource to be excluded, because if Gap=0 (i.e., if there is no retransmission), the corresponding resource is included in the existing resource exclusion operation.

[0486] Therefore, the parameter value “Gap” indicated by the retransmission time gap information of the SCI received by the first UE in time slot m (e.g., the field “time gap between initial transmission and retransmission”) can be defined as shown in Tables 24 and 25 below.

[0487] When setting initial transmission and one retransmission for a third UE (e.g., if N... max =2), the timing of the initial transmission and the first retransmission of the third UE can be determined based on the retransmission time gap information in the SCI, as shown in Table 24.

[0488] [Table 24]

[0489]

[0490] According to the example in Table 24, the first UE can identify time slot m+Gap (here, Gap = Gap1) and resources periodically reserved from time slot m+Gap for transmission as exclusion candidates, and can exclude the corresponding resources when the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources. When setting up initial transmission and two retransmissions for the third UE (e.g., if N... max =3), the timing of the initial transmission, first retransmission and second retransmission of the third UE can be determined based on the retransmission time gap information and retransmission index information, as shown in Table 25.

[0491] [Table 25]

[0492]

[0493] According to the example in Table 25, the first UE can identify time slot m+Gap (here, Gap = one of Gap1 and Gap = one of Gap1 and Gap2) and the resources periodically reserved from time slot m+Gap for the third UE to transmit as exclusion candidates, and when the exclusion candidate overlaps with the candidate resources to be sensed and the associated resources, the corresponding resources can be excluded. Figure 23 This illustrates the resource exclusion operations to which this disclosure can be applied.

[0494] Figure 23 An example of this can correspond to a resource exclusion process, which is Figure 17 This is part of the side-link transmission resource selection (or reselection) operation of operation S1740. Furthermore, Figure 23 Examples can be applied to both full sensing and partial sensing.

[0495] In operation S2310, the first UE can receive SCI from the third UE in time slot m.

[0496] In operation S2320, the first UE may determine a first exclusion candidate based on the received power measurement (e.g., PSSCH-RSRP) of the data channel (e.g., which will be scheduled by the SCI) corresponding to the SCI received in time slot m.

[0497] For example, if the received power measurement in time slot m exceeds a predetermined threshold (e.g., Th... prioTX,prioRX If a time slot m is selected, then the corresponding time slot m can be included in the first exclusion candidate. Furthermore, resources may be periodically reserved from time slot m for transmission by the third UE.

[0498] In operation S2330, the first UE can determine the time slot m+Gap in which the same data as the data in time slot m is transmitted.

[0499] For example, the parameter value "Gap" can be determined based on the retransmission time slot information (or retransmission time slot information and retransmission index information) included in the SCI of the third UE received in time slot m. For example, the parameter value "Gap" can be determined according to the descriptions in Examples 3 and 4. Here, time slot m can correspond to one of the initial transmission resources, the first retransmission resources, and the second retransmission resources of the same TB, and the remaining transmission / retransmission resources of the same TB can be determined according to the parameter value "Gap".

[0500] In operation S2340, the first UE can determine the second exclusion candidate based on time slot m+Gap.

[0501] For example, when time slot m is included in the first exclusion candidate, the second exclusion candidate may include time slot m+Gap and resources periodically reserved from time slot m+Gap for transmission by a third UE.

[0502] In operation S2350, the first UE can determine the resource to be sensed based on whether the first exclusion candidate, the second exclusion candidate, and the candidate resource to be sensed overlap.

[0503] For example, if any resource belonging to the first exclusion candidate and the second exclusion candidate overlaps with one of the candidate resources to be sensed and the associated resources, then the corresponding resource can be excluded from the resources to be sensed.

[0504] The candidate resource to be sensed can refer to a resource belonging to a predetermined duration. In the case of partial sensing, the predetermined duration can be as follows: Figure 12 The predetermined duration is a portion of the sensing unit's duration (e.g., duration Y), and the candidate resource to be sensed can refer to all possible time slots y within the corresponding duration. In the case of full sensing, the predetermined duration can be as follows: Figure 11The selection window (e.g., the duration of [TTI m+T1, TTI m+T2]) and the candidate resource to be sensed can be all possible time slots within the corresponding duration.

[0505] For example, if any of the candidate resources to be sensed within a predetermined duration (e.g., time slot y) and the associated resources (e.g., resources that can be periodically reserved from time slot y for transmission) overlap with any of the resources belonging to the first exclusion candidate and the second exclusion candidate, then the corresponding resource can be excluded from the resources to be sensed.

[0506] In operation S2360, the first UE can perform sensing on the resource to be sensed.

[0507] For example, operations S2310 to S2350 can be repeated by increasing the threshold until a set of resources to be sensed (e.g., S) with a predetermined number of resources to be sensed is configured. A When the set of resources to be sensed is configured, sensing reference resources (e.g., yk*P or yk*P) associated with each resource to be sensed (e.g., time slot y) can be configured. step The sensed values ​​in ')) are averaged to derive the sensed results.

[0508] The sensing results can be reported to the upper layer, and accordingly, the resources to be selected (or reselected) by the first UE for sidelink transmission can be determined.

[0509] Figure 24 This is a diagram illustrating a detailed configuration of a first terminal device to which this disclosure can be applied.

[0510] Figure 24 The PHY processing unit 2400 can correspond to Figure 18 The PHY processing unit 1815 of the first terminal device 1800.

[0511] The PHY processing unit 2400 may include a candidate exclusion determiner 2410, a candidate resource to be sensed determiner 2420, an overlap determiner 2430, a resource to be sensed determiner 2440, a sensing unit 2450, and a sensing result reporting unit 2460.

[0512] The exclusion candidate determiner 2410 can determine a first exclusion candidate based on the received power measurement of the data channel corresponding to the SCI received from the third UE in time slot m (e.g., time slot m and resources periodically reserved from time slot m for transmission by the third UE).

[0513] Furthermore, the exclusion candidate determiner 2410 can additionally determine a second exclusion candidate considering retransmission resources. For example, the exclusion candidate determiner 2410 can determine a parameter gap (refer to Examples 3 and 4 above for parameter value gaps) based on retransmission time slot information (or retransmission time slot information and retransmission index information) included in the SCI of the third UE received in time slot m. Additionally, when time slot m is included in the first exclusion candidate, the exclusion candidate determiner 2410 can determine a third exclusion candidate, which includes time slot m+Gap and resources periodically reserved from time slot m+Gap for the transmission of the third UE.

[0514] The candidate resource determiner 2420 can determine all possible resources within a predetermined time period as candidate resources to be sensed. For example, the candidate resource determiner 2420 can determine resources by... Figure 18 In the example, the partial sensing unit duration determiner 1816 determines all possible time slots (e.g., time slot y) within a predetermined duration (e.g., duration Y) as candidate resources to be sensed. Alternatively, the candidate resource determiner 2420 can determine... Figure 11 All possible time slots within the selection window (e.g., duration [TTI m+T1, TTI m+T2]) are selected as candidate resources to be sensed.

[0515] The overlap determiner 2430 can determine whether, within a predetermined duration determined by the candidate resource to be sensed (e.g., time slot y) and associated resources (e.g., resources that can be periodically reserved from time slot y for transmission), any one of the candidate resources to be sensed (e.g., time slot y) overlaps with any one of the resources belonging to the first exclusion candidate and the second exclusion candidate determined by the exclusion candidate determiner 2410.

[0516] The resource determiner 2440 can exclude resources determined to be overlapping by the overlap determiner 2430 from the resources to be sensed, and can determine non-overlapping candidate resources to be sensed as resources to be sensed. Furthermore, the resource determiner 2440 can repeatedly obtain results from the exclusion candidate determiner 2410, the candidate resource determiner 2420, and the overlap determiner 2430 until a set with a predetermined number of resources to be sensed is configured.

[0517] The sensing unit 2450 can perform sensing on each resource to be sensed in the set of resources to be sensed, and can derive the sensing result by averaging the sensed values.

[0518] The sensing result reporting unit 2450 can transmit the sensing results to the upper-layer processing unit 1811. Therefore, it is possible to determine the resources to be selected (or reselected) by the first UE for sidelink transmission.

[0519] include Figure 24 Other components of the first terminal device of the PHY processing unit 2400 may correspond to Figure 18 Components.

[0520] Although the exemplary method of the present invention is described as a series of operations for clarity, this does not limit the order of the steps. These steps can be performed simultaneously or in different orders as needed. To implement the method according to the present invention, the exemplary method may also include additional steps, including remaining steps in addition to some steps, or may include additional steps in addition to some steps.

[0521] The various examples described herein are intended to illustrate representative aspects of this disclosure, and not to describe all possible combinations and contents described in the various examples, which may be applied independently or by at least two of them.

[0522] Furthermore, the various examples of this disclosure can be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, the examples can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, etc.

[0523] The scope of this invention includes software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) that enable operation according to various examples of methods, as well as devices or non-transitory computer-readable media executable on a computer storing such software or instructions. Instructions that can be used to program a processing system performing the features described herein may be stored on / in a storage medium or a computer-readable storage medium, and the features described herein may be implemented using a computer program product incorporating such storage medium. The storage medium may include high-speed random access memory, such as dynamic random access memory (DRAM), static RAM (SRAM), DDR RAM, or other random access solid-state memory devices, and is not limited thereto, and may include non-volatile memory, such as at least one disk storage device, optical disk storage device, flash memory device, or other non-volatile solid-state level device. The memory may optionally include at least one storage device remote from one or more processors. The memory or one or more non-volatile memory devices in the memory may include non-transitory computer-readable storage media. The features described herein may be arbitrarily stored in one of the machine-readable media to control the hardware of the processing system. The processing system may be integrated into software and / or firmware that interlocks with other mechanisms using the results of examples according to this disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0524] Industrial applicability

[0525] This disclosure can be applied to improve the performance of various wireless communication systems.

Claims

1. A method for communication, comprising: The configuration information is received by the first wireless user equipment, and the configuration information indicates: Resource pool used for sidelink communication; Sensing window; as well as Periodic partial sensing; Monitor a first subset of time slots in a plurality of time slots within the sensing window, wherein the plurality of time slots includes a second subset of time slots not monitored by the first wireless user equipment; Based on the monitoring, at least one transmission resource is determined from at least one candidate time slot, wherein the at least one candidate time slot is after the sensing window, wherein the first subset of time slots includes at least one partially sensed time slot group, wherein the time difference between the at least one candidate time slot and each time slot group in the at least one partially sensed time slot group is a multiple of a resource reservation period, wherein the resource reservation period is selected from a subset of a configured set of resource reservation periods, and wherein the subset of the configured set of resource reservation periods is determined by excluding at least one resource reservation period from the configured set of resource reservation periods; and The sidelink signal is transmitted to the second wireless user equipment via the at least one transmission resource.

2. The method according to claim 1, wherein, The configured resource reservation time period set includes at least 0ms, 5ms, 10ms, 20ms, 50ms, 100ms, 200ms, 300ms, 400ms, 500ms, 600ms, 700ms, 800ms, 900ms and 1000ms.

3. The method according to claim 2, wherein, The subset of the configured resource reservation period set does not include resource reservation periods that are less than a threshold.

4. The method according to claim 2, wherein, The subset of the configured resource reservation time period does not include 0ms and 5ms.

5. The method according to claim 1, wherein: Each time slot group in the at least one partial sensing time slot group is composed of Sure, y is the at least one candidate time slot, It is selected from the subset of the configured resource reservation time period set. k is an integer, and It is a multiple of the reserved time period for the selected resources.

6. The method of claim 1, wherein the side link signal comprises at least one of the following: The Physical Side Link Control Channel (PSCCH), which includes the First Side Link Control Information (SCI); or The Physical Side Link Shared Channel (PSSCH) includes a second SCI.

7. The method according to claim 1, wherein, The at least one candidate time slot is associated with Y time slots for period-based partial sensing, and Each of the at least one partial sensing time slot group is associated with Y time slots for period-based partial sensing.

8. The method of claim 1, wherein the at least one candidate time slot is in a selection window following the sensing window, and in, The at least one partial sensing time slot group is at least partially discontinuous in the sensing window.

9. A first wireless user equipment, comprising: One or more processors; as well as A memory storing instructions that, when executed by the one or more processors, cause the first wireless user equipment to: Receive configuration information, the configuration information indicating: Resource pool used for sidelink communication; Sensing window; and Periodic partial sensing; Monitor a first subset of time slots in a plurality of time slots within the sensing window, wherein the plurality of time slots includes a second subset of time slots not monitored by the first wireless user equipment; Based on monitoring the first time slot subset, at least one transmission resource in at least one candidate time slot is determined, wherein the at least one candidate time slot is after the sensing window, wherein the first time slot subset includes at least one partially sensed time slot group, wherein the time difference between the at least one candidate time slot and each time slot group in the at least one partially sensed time slot group is a multiple of a resource reservation period, wherein the resource reservation period is selected from a subset of a configured set of resource reservation periods, and wherein the subset of the configured set of resource reservation periods is determined by excluding at least one resource reservation period from the configured set of resource reservation periods; and The sidelink signal is transmitted to the second wireless user equipment via the at least one transmission resource.

10. The first wireless user equipment according to claim 9, wherein, The configured resource reservation time period set includes at least 0ms, 5ms, 10ms, 20ms, 50ms, 100ms, 200ms, 300ms, 400ms, 500ms, 600ms, 700ms, 800ms, 900ms and 1000ms.

11. The first wireless user equipment according to claim 10, wherein, The subset of the configured resource reservation period set does not include resource reservation periods that are less than a threshold.

12. The first wireless user equipment according to claim 10, wherein, The subset of the configured resource reservation time period does not include 0ms and 5ms.

13. The first wireless user equipment according to claim 9, wherein: Each time slot group in the at least one partial sensing time slot group is composed of Sure, y is the at least one candidate time slot, It is selected from the subset of the configured resource reservation time period set. k is an integer, and It is a multiple of the reserved time period for the selected resources.

14. The first wireless user equipment according to claim 9, wherein, The sidelink signal includes at least one of the following: The Physical Side Link Control Channel (PSCCH), which includes the First Side Link Control Information (SCI); or Physical Side Link Shared Channel (PSSCH), which includes a second SCI.

15. The first wireless user equipment according to claim 9, wherein, The at least one candidate time slot is associated with Y time slots for period-based partial sensing, and Each of the at least one partial sensing time slot group is associated with Y time slots for period-based partial sensing.

16. The first wireless user equipment according to claim 9, wherein, The at least one candidate time slot is in the selection window that follows the sensing window, and Wherein, the at least one partial sensing time slot group is at least partially discontinuous in the sensing window.

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