Terminal device, communication method and integrated circuit

Abstract

To improve efficiency of resource allocation in wireless communication.SOLUTION: A terminal device includes: a reception machine for receiving frequency information on N number of frequency resources; and a control circuit for determining N number of frequency resources to reserve for N number of time resources, the N number of frequency resources being different from one another. The frequency information on the N number of frequency resources is received by the same side-link control information, N number is determined by a set including a plurality of values of at least 2, and information on N number is notified by an upper layer signal.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a terminal and a communication method. [Background technology]

[0002] A communication system called the fifth generation mobile communication system (5G) is currently under consideration. With 5G, it is being considered how to flexibly provide functions for each use case that requires an increase in high-speed communication traffic, an increase in the number of connected terminals, high reliability, and low latency. The international standardization organization, the 3rd Generation Partnership Project (3GPP), is considering the sophistication of communication systems from both the perspectives of Long Term Evolution (LTE) systems and New Radio (NR).

[0003] In 3GPP, support for vehicle to everything (V2X) has been considered in the LTE system. Support for V2X is also being considered in NR, which can use a wider bandwidth than the LTE system (see, for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TR 38.885 V16.0.0, "Study on NR Vehicle-to-Everything (V2X) (Release 16), 2019-03 Summary of the Invention

[0005] However, there is room for improvement in the efficiency of resource (eg, time resource and / or frequency resource) allocation in wireless communication.

[0006] Non-limiting embodiments of the present disclosure contribute to providing a terminal and a transmission method capable of improving the efficiency of resource allocation in wireless communication.

[0007] A terminal according to one embodiment of the present disclosure includes a control circuit that determines first information indicating frequency resources to be reserved and second information indicating a method of allocating channels to the frequency resources, and a transmission circuit that transmits the first information and the second information.

[0008] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0009] According to an embodiment of the present disclosure, it is possible to improve the efficiency of resource allocation in wireless communication.

[0010] Further advantages and benefits of an embodiment of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is an example architecture diagram of a 3GPP NR system. [Diagram 2] Schematic diagram showing functional separation between NG-RAN and 5GC [Diagram 3] Sequence diagram of RRC connection setup / reconfiguration procedure [Figure 4]A schematic diagram showing the usage scenarios of enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communications (URLLC). [Diagram 5] Block diagram illustrating an example 5G system architecture for a non-roaming scenario [Figure 6] A diagram showing an example of resource allocation [Figure 7] A diagram showing an example of the association between resource reservation and X. [Figure 8] Block diagram showing an example of a partial configuration of a terminal [Figure 9] Block diagram showing an example of the configuration of a base station [Figure 10] Block diagram showing an example of a terminal configuration [Figure 11] Flowchart showing an example of the operation of a terminal [Figure 12] FIG. 13 is a diagram showing an example of the association between resource reservation and X and W according to operation example 1-1. [Figure 13] FIG. 13 is a diagram showing another example of the association between resource reservation and X and W according to the operation example 1-1. [Figure 14] FIG. 13 is a diagram showing an example of an association between resource reservation and X according to operation example 1-2. [Figure 15] FIG. 1 illustrates an example of a circular buffer. [Figure 16] FIG. 13 is a diagram showing an example of resource allocation according to operation example 3-1. [Figure 17] FIG. 13 is a diagram showing an example of resource allocation according to operation example 3-2. [Figure 18] FIG. 1 shows an example of a Standalone PSCCH and a Single sub-channel of PSCCH+PSSCH. [Figure 19] Block diagram showing an example of a partial configuration of a terminal [Figure 20] Block diagram showing an example of the configuration of a base station [Figure 21] Block diagram showing an example of a terminal configuration [Figure 22] Flowchart showing an example of the operation of a terminal [Figure 23] FIG. 4 is a diagram showing an example of resource allocation according to operation example 4-2. [Figure 24] FIG. 7 is a diagram showing an example of resource allocation according to the operation example 7-1. [Diagram 25] FIG. 7 is a diagram showing an example of resource allocation according to the operation example 7-2. [Figure 26] FIG. 7 is a diagram showing an example of resource allocation according to the operation example 7-3. [Figure 27] FIG. 7 shows an example of a frequency resource pattern according to operation example 7-4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0013] <5G NR system architecture and protocol stack> 3GPP continues to work on the next release of the fifth generation of mobile phone technology (also known simply as "5G"), which includes the development of New Radio Access Technology (NR) operating in the frequency range up to 100 GHz. The first version of the 5G standard was completed at the end of 2017, allowing for the prototyping and commercial deployment of 5G NR compliant devices (e.g. smartphones).

[0014] For example, the system architecture generally assumes a Next Generation - Radio Access Network (NG-RAN) with gNBs. The gNBs provide the UE-side termination of the NG radio access user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocols. The gNBs are connected to each other by an Xn interface. The gNBs are also connected to a Next Generation Core (NGC) by a Next Generation (NG) interface, more specifically to an Access and Mobility Management Function (AMF) (e.g., a specific core entity performing AMF) by an NG-C interface, and to a User Plane Function (UPF) (e.g., a specific core entity performing UPF) by an NG-U interface. The NG-RAN architecture is shown in Figure 1 (see, e.g., 3GPP TS 38.300 v15.6.0, section 4).

[0015] The NR user plane protocol stack (see, for example, 3GPP TS 38.300, section 4.4.1) includes the Packet Data Convergence Protocol (PDCP) (see section 6.4 of TS 38.300), Radio Link Control (RLC) (see section 6.3 of TS 38.300), and Medium Access Control (MAC) (see section 6.2 of TS 38.300) sublayers, which are terminated on the network side at the gNB. A new Access Stratum (AS) sublayer (Service Data Adaptation Protocol (SDAP)) is also introduced on top of PDCP (see, for example, 3GPP TS 38.300, section 6.5). A control plane protocol stack is also defined for NR (see, for example, TS 38.300, section 4.4.2). An overview of Layer 2 functions is given in section 6 of TS 38.300. The functions of the PDCP, RLC and MAC sublayers are listed in clauses 6.4, 6.3 and 6.2 of TS 38.300, respectively. The functions of the RRC layer are listed in clause 7 of TS 38.300.

[0016] For example, the Medium-Access-Control layer handles logical channel multiplexing and scheduling and scheduling-related functions, including handling various numerologies.

[0017] For example, the physical layer (PHY) is responsible for coding, PHY HARQ processing, modulation, multi-antenna processing, and mapping of signals to appropriate physical time-frequency resources. The physical layer also handles mapping of transport channels to physical channels. The physical layer provides services to the MAC layer in the form of transport channels. A physical channel corresponds to a set of time-frequency resources used for the transmission of a particular transport channel, and each transport channel is mapped to a corresponding physical channel. For example, the physical channels include the PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel) as uplink physical channels, and the PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), and PBCH (Physical Broadcast Channel) as downlink physical channels.

[0018] NR use cases / deployment scenarios may include enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine type communication (mMTC), which have diverse requirements in terms of data rates, latency, and coverage. For example, eMBB is expected to support peak data rates (20 Gbps in downlink and 10 Gbps in uplink) and effective (user-experienced) data rates that are about three times higher than those offered by IMT-Advanced. On the other hand, for URLLC, more stringent requirements include ultra-low latency (0.5 ms for user plane latency in UL and DL respectively) and high reliability (1-10 Mbps within 1 ms). -5Finally, mMTC is preferably regulated to have high connection density (1,000,000 devices / km in urban environments). 2 ), wide coverage in hostile environments, and extremely long battery life (15 years) for a low-cost device.

[0019] Therefore, OFDM numerology (e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval) suitable for one use case may not be valid for other use cases. For example, low latency services may preferably require a shorter symbol length (and therefore a larger subcarrier spacing) and / or fewer symbols per scheduling interval (also called TTI) than mMTC services. Furthermore, deployment scenarios with large channel delay spreads may preferably require a longer CP length than scenarios with smaller delay spreads. Subcarrier spacing may be optimized accordingly to maintain a similar CP overhead. NR may support one or more subcarrier spacing values. Correspondingly, subcarrier spacings of 15 kHz, 30 kHz, 60 kHz... are currently considered. Symbol length T u and the subcarrier spacing Δf is given by the formula Δf=1 / T u Similar to LTE systems, the term "resource element" can be used to mean the smallest resource unit consisting of one subcarrier for the length of one OFDM / SC-FDMA symbol.

[0020] In the new radio system 5G-NR, for each numerology and each carrier, a resource grid of subcarriers and OFDM symbols is defined for the uplink and downlink, respectively. Each element of the resource grid is called a resource element and is specified based on a frequency index in the frequency domain and a symbol position in the time domain (see 3GPP TS 38.211 v15.6.0).

[0021] <Functional separation between NG-RAN and 5GC in 5G NR> Figure 2 shows the functional separation between NG-RAN and 5GC. The logical node of NG-RAN is gNB or ng-eNB. 5GC has logical nodes AMF, UPF, and SMF.

[0022] For example, the gNB and ng-eNB host the following main functions: - Radio Resource Management functions such as Radio Bearer Control, Radio Admission Control, Connection Mobility Control, dynamic allocation (scheduling) of resources to UEs in both uplink and downlink; - IP header compression, encryption, and integrity protection of data; - Selection of the AMF at UE attach time if routing to the AMF cannot be determined from information provided by the UE; - Routing of user plane data towards the UPF; - Routing of control plane information towards AMF; - Setting up and tearing down connections; - Scheduling and sending paging messages; - Scheduling and transmission of system broadcast information (AMF or Operation, Admission, Maintenance (OAM) origin); - Configuration of measurements and measurement reporting for mobility and scheduling; - Transport level packet marking in the uplink; - Session management; - Support for network slicing; - Management of QoS flows and their mapping to data radio bearers; - Support for UEs in RRC_INACTIVE state; - NAS message delivery function; - Sharing of radio access networks; - Dual connectivity; - Close cooperation between NR and E-UTRA.

[0023] The Access and Mobility Management Function (AMF) hosts the following main functions: - Ability to terminate Non-Access Stratum (NAS) signalling; - NAS signaling security; - Access Stratum (AS) security control; - 3GPP Core Network (CN) inter-node signalling for mobility between access networks; - Reachability to idle mode UEs (including control and execution of paging retransmissions); - Managing the registration area; - Support for intra-system and inter-system mobility; - Access authentication; - Access authorization including roaming privilege checks; - Mobility management control (subscription and policies); - Support for network slicing; - Select the Session Management Function (SMF).

[0024] Additionally, the User Plane Function (UPF) hosts the following main functions: - anchor points for intra-RAT mobility / inter-RAT mobility (if applicable); - External PDU (Protocol Data Unit) Session Points for interconnection with data networks; - Packet routing and forwarding; - Packet inspection and policy rule enforcement in the user plane part; - Reporting of traffic usage; - Uplink classifier for supporting routing of traffic flows to the data network; - Branching Point for supporting multi-homed PDU session; - QoS processing for the user plane (e.g., packet filtering, gating, UL / DL rate enforcement); - Verification of uplink traffic (mapping to QoS flows of SDF); - Downlink packet buffering and triggering function for downlink data notification.

[0025] Finally, the Session Management Function (SMF) hosts the following main functions: - Session management; - IP address allocation and management for the UE; - Selection and control of the UPF; - Traffic steering setting function in the User Plane Function (UPF) for routing traffic to the appropriate destination; - Policy enforcement and QoS in the control part; - Notification of downlink data.

[0026] <Procedures for RRC connection setup and reconfiguration> Figure 3 shows some of the interactions between the UE, gNB and AMF (5GC entities) when the UE transitions from RRC_IDLE to RRC_CONNECTED, NAS part (see TS 38.300 v15.6.0).

[0027] RRC is a higher layer signaling (protocol) used for UE and gNB configuration. With this transition, the AMF prepares UE context data (which includes, for example, PDU session context, security keys, UE Radio Capability, UE Security Capabilities, etc.) and sends it to the gNB with an INITIAL CONTEXT SETUP REQUEST. The gNB then activates AS security together with the UE. This is done by the gNB sending a SecurityModeCommand message to the UE, and the UE responding with a SecurityModeComplete message to the gNB. The gNB then reconfigures to set up Signaling Radio Bearer 2 (SRB2) and Data Radio Bearer (DRB) by sending an RRCReconfiguration message to the UE and receiving an RRCReconfigurationComplete from the UE. For signaling-only connections, the steps related to RRCReconfiguration are omitted since SRB2 and DRB are not set up. Finally, the gNB informs the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP RESPONSE.

[0028] Therefore, the present disclosure provides an entity (e.g., AMF, SMF, etc.) of a 5th Generation Core (5GC), comprising: a control circuit that operatively establishes a Next Generation (NG) connection with a gNodeB; and a transmitter that operatively transmits an initial context setup message to the gNodeB via the NG connection so that a signaling radio bearer between the gNodeB and a User Equipment (UE) is set up. Specifically, the gNodeB transmits Radio Resource Control (RRC) signaling including a resource allocation configuration information element (IE) to the UE via the signaling radio bearer. Then, the UE transmits in uplink or receives in downlink based on the resource allocation configuration.

[0029] <IMT usage scenarios after 2020> Figure 4 shows some of the use cases for 5G NR. The 3rd generation partnership project new radio (3GPP NR) considers three use cases that were envisioned by IMT-2020 to support a wide variety of services and applications. The first phase of specifications for enhanced mobile-broadband (eMBB) has been completed. Current and future work includes standardization for ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), in addition to expanding support for eMBB. Figure 4 shows some examples of envisioned usage scenarios for IMT beyond 2020 (see e.g. ITU-R M.2083 Figure 2).

[0030] URLLC use cases have stringent requirements for performance such as throughput, latency, and availability. URLLC use cases are envisioned as one of the enabling technologies for future applications such as wireless control of industrial production or manufacturing processes, remote medical surgery, automation of power transmission and distribution in smart grids, and road safety. URLLC's ultra-high reliability is supported by identifying technologies that meet the requirements set by TR 38.913. Key requirements for NR URLLC in Release 15 include a target user plane latency of 0.5 ms on the UL (uplink) and 0.5 ms on the DL (downlink). The overall URLLC requirement for a single packet transmission is a block error rate (BLER) of 1E-5 for a packet size of 32 bytes with a user plane latency of 1 ms.

[0031] From a physical layer perspective, reliability can be improved in many possible ways. Current room for reliability improvement includes defining a separate CQI table for URLLC, more compact DCI formats, PDCCH repetition, etc. However, this room can be expanded to achieve ultra-high reliability as NR (with respect to the key requirements of NR URLLC) becomes more stable and more developed. Specific use cases for NR URLLC in Release 15 include augmented reality / virtual reality (AR / VR), e-health, e-safety, and mission-critical applications.

[0032] Also, technology enhancements targeted by NR URLLC aim at improving latency and improving reliability. Technology enhancements for improving latency include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplink, slot-level repetition in data channel, and pre-emption in downlink. Pre-emption means that a transmission with already allocated resources is stopped and the already allocated resources are used for other transmissions with lower latency / higher priority requirements that are requested later. Thus, a transmission that was already allowed is preempted by a later transmission. Pre-emption is applicable regardless of the specific service type. For example, a transmission of service type A (URLLC) may be preempted by a transmission of service type B (eMBB, etc.). Technology enhancements for improving reliability include dedicated CQI / MCS tables for a target BLER of 1E-5.

[0033] The use case of mMTC (massive machine type communication) is characterized by a very large number of connected devices transmitting relatively small amounts of data that are typically not sensitive to delays. The devices are required to be low-cost and have a very long battery life. From an NR perspective, the use of very narrow bandwidth portions is one solution that allows UEs to save power and extend battery life.

[0034] As mentioned above, the scope of reliability improvement in NR is expected to be broader. One of the key requirements for all cases, e.g. for URLLC and mMTC, is high or ultra-high reliability. Several mechanisms can improve reliability from a radio perspective and a network perspective. In general, there are two to three key areas that can help improve reliability. These areas include compact control channel information, data channel / control channel repetition, and diversity with respect to frequency, time, and / or spatial domains. These areas are generally applicable to reliability improvement regardless of the specific communication scenario.

[0035] Further use cases with more stringent requirements are envisaged for NR URLLC, such as factory automation, transportation, and power distribution. The stringent requirements include high reliability (10 -6 level of reliability), high availability, packet size up to 256 bytes, time synchronization up to a few μs (depending on the use case, the value can be 1 μs or a few μs depending on the frequency range and short latency on the order of 0.5 ms to 1 ms (e.g. 0.5 ms latency on the targeted user plane).

[0036] Furthermore, for NR URLLC, several technical enhancements may be available from the perspective of the physical layer. These technical enhancements include enhancements to the Physical Downlink Control Channel (PDCCH) related to compact DCI, repetition of the PDCCH, and increased monitoring of the PDCCH. Also, the enhancement of UCI (Uplink Control Information) is related to the enhancement of enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback. Additionally, there may be enhancements to the PUSCH related to mini-slot level hopping, and enhancements to retransmission / repetition. The term "mini-slot" refers to a Transmission Time Interval (TTI) that contains fewer symbols than a slot (a slot has 14 symbols).

[0037] <QoS Control> The 5G Quality of Service (QoS) model is based on QoS flows and supports both QoS flows that require a guaranteed flow bit rate (GBR: Guaranteed Bit Rate QoS flows) and QoS flows that do not require a guaranteed flow bit rate (non-GBR QoS flows). Therefore, at the NAS level, a QoS flow is the finest-grained QoS differentiation in a PDU session. A QoS flow is identified within a PDU session by a QoS Flow ID (QFI) that is carried in an encapsulation header via the NG-U interface.

[0038] For each UE, the 5GC establishes one or more PDU sessions. For each UE, the NG-RAN establishes at least one Data Radio Bearer (DRB) for the PDU session, e.g. as shown above with reference to Fig. 3. Additional DRBs for the QoS flows of that PDU session can be configured later (when it is up to the NG-RAN). The NG-RAN maps packets belonging to different PDU sessions to different DRBs. The NAS level packet filters in the UE and 5GC associate UL and DL packets with QoS flows, whereas the AS level mapping rules in the UE and NG-RAN associate UL and DL QoS flows with DRBs.

[0039] Figure 5 shows the non-roaming reference architecture for 5G NR (see TS 23.501 v16.1.0, section 4.23). An Application Function (AF) (e.g., an external application server hosting 5G services as illustrated in Figure 4) interacts with the 3GPP core network to provide services, for example by accessing a Network Exposure Function (NEF) to support applications that affect traffic routing, or by interacting with a policy framework for policy control (e.g., QoS control) (see Policy Control Function (PCF)). Based on the operator's deployment, Application Functions that are considered trusted by the operator can interact directly with the relevant Network Functions. Application Functions that are not allowed by the operator to directly access the Network Functions interact with the relevant Network Functions using an exposure framework for external use via the NEF.

[0040] Figure 5 further illustrates further functional units of the 5G architecture: Network Slice Selection Function (NSSF), Network Repository Function (NRF), Unified Data Management (UDM), Authentication Server Function (AUSF), Access and Mobility Management Function (AMF), Session Management Function (SMF), and Data Network (DN, e.g., operator-provided services, Internet access, or third-party services). All or part of the core network functions and application services may be deployed and run in a cloud computing environment.

[0041] Therefore, the present disclosure provides an application server (e.g., an AF in a 5G architecture) comprising: a transmitter that, when operated, sends a request including QoS requirements for at least one of a URLLC service, an eMMB service, and an mMTC service to at least one of the 5GC functions (e.g., NEF, AMF, SMF, PCF, UPF, etc.) to establish a PDU session including a radio bearer between a gNodeB and a UE according to the QoS requirements; and a control circuit that, when operated, performs a service using the established PDU session.

[0042] [V2X] V2X envisions, for example, communication between vehicles (V2V: Vehicle to Vehicle), between a road and a vehicle (V2I: Vehicle to Infrastructure), between a pedestrian and a vehicle (V2P: Vehicle to Pedestrian), or between vehicle networks (V2N: Vehicle to Network).

[0043] In V2V, V2I, or V2P, for example, direct transmission and reception can be performed between terminals (also called user equipment (UE)) using a link called "sidelink (SL)" or "PC5" without going through a network with a base station (for example, base station (BS), or also called gNB in ​​NR, or eNB in ​​LTE). In addition, in V2N, for example, communication via a link (for example, called "Uu") between a base station and a terminal is assumed.

[0044] The resources used for the sidelink are set, for example, by the SL Band width part (BWP) and a resource pool.

[0045] The SL BWP is, for example, a frequency band that a terminal can use for a side link. The SL BWP may be set separately from a Downlink (DL) BWP and an Uplink (UL) BWP set in a link (for example, a Uu link) between a base station and a terminal. Note that the frequency bands may overlap between the SL BWP and the UL BWP.

[0046] The resource pool includes, for example, resources in the frequency domain (for example, also referred to as the frequency direction or frequency axis) and the time domain (for example, also referred to as the time direction or time axis) specified in the resource in the SL BWP. For example, multiple resource pools may be set for one terminal.

[0047] [Sidelink in NR] In NR V2X, support for, for example, unicast, groupcast, and broadcast is being considered for transmission and reception on the sidelink.

[0048] Unicast assumes, for example, one-to-one transmission from a transmitting terminal (also called, for example, transmitter UE or Tx UE) to a receiving terminal (also called, for example, receiver UE or Rx UE). Groupcast assumes, for example, transmission from a transmitting terminal to multiple receiving terminals included in a certain group. Broadcast assumes, for example, transmission from a transmitting terminal without specifying a receiving terminal.

[0049] In addition, for the NR sidelink, for example, the following channel settings are being considered:

[0050] <PSCCH:physical SL control channel> In the PSCCH, for example, a control signal called sidelink control information (SCI) is transmitted and received. The SCI includes information related to the transmission and reception of the PSSCH, such as resource allocation information for a data signal (for example, a PSSCH (physical SL shared channel)).

[0051] Also, for example, the SCI may include information (e.g., Layer 1 source ID) about the transmitting terminal (in other words, the source terminal) and information (e.g., Layer 1 destination ID) about the receiving terminal (in other words, the destination terminal). This information identifies the transmitting terminal and the receiving terminal.

[0052] <pssch> In the PSSCH, for example, data signals are transmitted and received.

[0053] <PSFCH:physical SL feedback channel> In the PSFCH, for example, a feedback signal (e.g., hybrid automatic repeat request (HARQ) feedback) for the PSSCH (e.g., a data signal) is transmitted and received. The feedback signal may include, for example, a response signal indicating an ACK or a NACK (e.g., ACK / NACK information, also referred to as HARQ-ACK). It is being considered that the feedback signal is applied, for example, to cases where the PSSCH is transmitted and received by unicast and groupcast. The ACK and NACK may be referred to, for example, as HARQ-ACK and HARQ-NACK, respectively.

[0054] <PSBCH:physical SL broadcast channel> Broadcast signals are transmitted and received on the PSBCH.

[0055] [Sidelink communication mode] Sidelink communication has, for example, two modes (e.g., Mode 1 and Mode 2).

[0056] In Mode 1, the base station determines (in other words, schedules) resources (for example, referred to as SL resources) to be used by a terminal in the side link.

[0057] In Mode 2, the terminal determines the SL resource from resources in a pre-configured resource pool. In other words, in Mode 2, the base station does not schedule the SL resource.

[0058] Mode 1 is assumed to be used in an environment where the base station and terminal are connected and the terminal can receive instructions from the base station for sidelink communication. Mode 2 allows the terminal to transmit even without instructions from the base station, so sidelink communication is possible with terminals under different operators or terminals outside the coverage area.

[0059] The side link has been described above.

[0060] For example, in LTE V2X, periodic signal transmission in the time domain is assumed. Based on this assumption, for example, in addition to a time resource (e.g., a slot) for a signal notified by an SCI, a time resource following the time resource may be reserved for a terminal. The SCI notifying a terminal of a resource reserved for the terminal (in other words, an assigned resource) may be received by, for example, a terminal to which the SCI is assigned (in other words, a terminal to which the SCI is transmitted) as well as other terminals. In other words, the resource reserved by the SCI may be detected by other terminals other than the terminal to which the SCI is assigned. When selecting a resource to be used, each terminal can reduce the probability of resource collision by, for example, avoiding the use of resources reserved for other terminals.

[0061] For example, the format of the SCI, which is a control signal transmitted on the PSCCH (for example, "SCI format 1"), includes the following information:

[0062] "Priority" (e.g., 3 bits): "Priority" is information indicating the priority of a transport block (TB) transmitted in the PSSCH.

[0063] "Resource reservation" (e.g., 4 bits): "Resource reservation" is information notifying the time interval between a TB included in a PSCCH transmitted in the same slot as a PSCCH in which an SCI is arranged, and a PSSCH including the next TB. For example, "resource reservation" is information notifying the interval between resources corresponding to the current TB and the next TB (in other words, the interval between TBs).

[0064] "Frequency resource location of initial transmission and retransmission": "Frequency resource location of initial transmission and retransmission" is information that allocates frequency domain resources in subchannel units. For example, the terminal may assume the use of the frequency resources indicated in the information in both the slot in which the SCI is placed and the reserved slots following the slot. In addition, consecutive sub-channels may be allocated in the frequency domain. The number of bits of "Frequency resource location of initial transmission and retransmission" is expressed, for example, as follows:

number

[0065] Here, N subchannel SL For example, indicates the total number of subchannels in the resource pool.

[0066] "Time gap between initial transmission and retransmission" (e.g., 4 bits): "Time gap between initial transmission and retransmission" is information notifying the time interval (also called a gap, for example) between the initial transmission and retransmission of the same TB.

[0067] "Modulation and coding scheme" (e.g., 5 bits): "Modulation and coding scheme" is information that notifies the modulation and coding scheme (MCS).

[0068] "Retransmission index" (e.g., 1 bit): "Retransmission index" is information notifying whether it is an initial transmission or a retransmission.

[0069] In LTE, for example, resources for multiple TBs are allocated (in other words, reserved) based on the above-mentioned SCI information. For example, in LTE, resources for four slots can be reserved for the transmission of a TB in a slot in which an SCI is placed (for example, initial transmission), retransmission of the TB, transmission of a next TB different from the TB (for example, initial transmission), and retransmission of the next TB.

[0070] Above, we have explained the information contained in SCI format 1.

[0071] FIG. 6 shows an example of allocating resources using the SCI.

[0072] In Fig. 6, as an example, a time resource corresponding to 1 ms is expressed as a "slot", but the unit of the time resource corresponding to 1 ms is not limited to a slot. For example, in LTE, a time resource corresponding to 1 ms is called a "subframe".

[0073] In FIG. 6, as an example, sub-channels #1 and #2 are assigned to the terminal in the frequency domain. The sub-channels may be notified to the terminal by, for example, "Frequency resource location of initial transmission and retransmission." In addition, the initial transmission of TB #1 is assigned to slot #0 in the time domain.

[0074] Also, in Fig. 6, as an example, the interval between TBs notified by "Resource reservation" in the SCI notifying Slot#0 allocated to the initial transmission of TB#1 is set to 100 ms (e.g., a time interval of 100 slots). Also, in Fig. 6, as an example, the time interval (or gap) between the initial transmission and retransmission notified by "Time gap between initial transmission and retransmission" in the SCI notifying Slot#0 allocated to the initial transmission of TB#1 is set to 2 ms (e.g., a time interval of 2 slots).

[0075] In the time domain resource allocation shown in Fig. 6, for example, slots at 100 ms intervals from slot #0 (e.g., Slot #0, slot #100, slot #200, ...) and slots at 100 ms intervals from slot #2 (e.g., Slot #2, slot #102, slot #202, ...) are reserved for the terminal by information included in the SCI transmitted in slot #0. Also, in the frequency domain resource allocation shown in Fig. 6, for example, sub-channels #1 and #2 in each reserved slot are reserved for the terminal by information included in the SCI.

[0076] Also, in FIG. 6, for example, there may be a case where the terminal fails to receive the SCI transmitted in slot #0 and succeeds in receiving the SCI transmitted in slot #2. In this case, for example, the terminal is notified that the TB transmitted in slot #2 is retransmitted by the "Retransmission index" included in the SCI transmitted in slot #2, and is notified of the time interval between the initial transmission and the retransmission (for example, a time interval of 2 ms or 2 slots) by the "Time gap between initial transmission and retransmission". For example, based on these notifications, the terminal can identify (in other words, recognize or determine) the time resource allocated to the initial transmission of the TB as slot #0, which failed to receive the SCI. Therefore, even if the terminal fails to receive the SCI, slots with a period of 100 ms from slot #0 and slots with a period of 100 ms from slot #2, and sub-channels #1 and #2 in each of these slots are reserved for the terminal.

[0077] This concludes our explanation of LTE V2X.

[0078] However, a method for reserving (or allocating) resources in the sidelink of NR V2X has not been fully considered. Therefore, in one embodiment of the present disclosure, a method for improving the efficiency of resource allocation (or resource reservation) in sidelink communication, such as time resources (e.g., intervals or gaps) or frequency resources (e.g., sub-channels), is described.

[0079] (Embodiment 1) In this embodiment, a method for setting time resources in sidelink communication will be described.

[0080] In LTE, when "resource reservation" is notified to a terminal (e.g., a receiving terminal) by SCI, the terminal determines the interval between TBs by referring to the association (which may be represented in a table, for example) between "resource reservation" and a value "X" related to the interval between TBs shown in FIG. 7. For example, the value "X" shown in FIG. 7 is the interval between TBs divided by 100. The association between "resource reservation" shown in FIG. 7 and "X" may be notified (or set) from the base station to each terminal by a higher layer, for example.

[0081] For example, the terminal can set an interval of X×100 ms to 20 ms, 50 ms, or 100X ms (X times 100, where X is any integer from 1 to 10) by referring to the association shown in Fig. 7. In LTE (e.g., Fig. 7), of the intervals set in the terminal, 20 ms (X=0.2) is the shortest interval, and 1000 ms (X=10) is the longest interval.

[0082] However, NR is required to support more diverse traffic types than LTE. Therefore, it may be assumed that NR cannot support traffic types with intervals similar to those that can be set in LTE (e.g., FIG. 7). For example, NR may set an interval shorter than the shortest interval that can be set in LTE (e.g., FIG. 7)=20 ms. Or, NR may set an interval longer than the longest interval that can be set in LTE (e.g., FIG. 7)=1000 ms.

[0083] Therefore, in one embodiment of the present disclosure, a method for more flexibly setting time resources (e.g., intervals) in sidelink communication is described.

[0084] [Communication system overview] The communication system according to this embodiment includes base station 100 and terminal 200.

[0085] Fig. 8 is a block diagram showing a configuration example of a part of terminal 200 according to this embodiment. In terminal 200 shown in Fig. 8, a control unit (e.g., corresponding to a control circuit) determines first information including a second value (X) obtained by dividing an interval of a time resource to be reserved by a first value (W), and second information indicating an association between the second value and the first information (e.g., a table to be described later) and indicating one of at least one of the candidates when there are multiple candidates for at least one of the first values. A communication unit (e.g., corresponding to a communication circuit) transmits the first information and the second information (e.g., SCI).

[0086] Alternatively, in the terminal 200 shown in Fig. 8, a communication unit (e.g., corresponding to a receiving circuit) receives first information including a second value (X) obtained by dividing an interval of a time resource to be reserved by a first value (W), and second information (e.g., SCI) indicating an association between the second value and the first information (e.g., a table to be described later) and indicating one of at least one of the first values ​​(W) when there are multiple candidates. A control unit (e.g., corresponding to a control circuit) determines an interval (e.g., X x W) based on the first information and the second information.

[0087] [Base station configuration] Fig. 9 is a block diagram showing an example of the configuration of base station 100 according to this embodiment. In Fig. 9, base station 100 includes interval setting section 101, resource pool setting section 102, error correction coding section 103, modulation section 104, signal allocation section 105, transmission section 106, reception section 107, signal separation section 108, demodulation section 109, and error correction decoding section 110.

[0088] Interval setting section 101 sets candidates for intervals (in other words, time intervals) between different TBs (e.g., new TBs). Interval setting section 101 may set interval candidates for each resource pool to be assigned to terminal 200, for example. Interval setting section 101 outputs information on the set interval candidates (hereinafter referred to as "interval candidate information") to resource pool setting section 102. In addition, interval setting section 101 outputs higher layer signaling including the interval candidate information to error correction coding section 103.

[0089] The resource pool setting unit 102 sets a resource pool to be used for the side link for each terminal 200. For example, the resource pool setting unit 102 may generate information on time resources and frequency resources of a resource pool (hereinafter referred to as resource pool setting information) based on the interval candidate information input from the interval setting unit 101. The resource pool setting unit 102 outputs higher layer signaling including the resource pool setting information to the error correction coding unit 103. Furthermore, the resource pool setting unit 102 outputs the resource pool setting information to the signal allocation unit 105 and the signal separation unit 108.

[0090] The error correction coding unit 103 receives as input the transmission data signal (DL data signal) and higher layer signaling input from the interval setting unit 101 and the resource pool setting unit 102, performs error correction coding on the input signal, and outputs the coded signal to the modulation unit 104.

[0091] The modulation section 104 performs modulation processing on the signal input from the error correction coding section 103 and outputs the modulated data signal to the signal allocation section 105 .

[0092] The signal allocating unit 105 allocates the data signal (e.g., DL data signal or higher layer signaling) input from the modulating unit 104 to resources available in a link (e.g., Uu link) between the base station 100 and the terminal 200. The formed transmission signal is output to the transmitting unit 106.

[0093] For example, the signal allocating unit 105 identifies (in other words, recognizes) slots available for sidelink communication based on information input from the resource pool setting unit 102. Then, for example, when the terminal 200 cannot simultaneously transmit and receive data in a link used for DL ​​data (e.g., a Uu link) and the sidelink, the signal allocating unit 105 may allocate a data signal to resources not used for the sidelink.

[0094] The resource pool settings may be different for each terminal 200. In this case, the slots available for use in the Uu link are different for each terminal 200.

[0095] Transmitting section 106 performs radio transmission processing such as up-conversion on the signal input from signal allocating section 105, and transmits the signal to terminal 200 via an antenna.

[0096] Receiving section 107 receives the signal transmitted from terminal 200 via an antenna, performs radio reception processing such as down-conversion on the signal, and outputs the signal to signal separating section 108.

[0097] The signal separator 108 identifies, for example, slots available for use in the Uu link and slots available for use in sidelink communication, based on, for example, information input from the resource pool setting unit 102. Then, the signal separator 108 separates the signals assigned to the resources available for use in the Uu link, which are input from the receiving unit 107. The signal separator 108 outputs the separated signals (for example, UL data signals) to the demodulator 109.

[0098] The demodulation section 109 performs demodulation processing on the signal input from the signal separation section 108 , and outputs the obtained signal to the error correction decoding section 110 .

[0099] Error correction decoding section 110 decodes the signal inputted from demodulation section 109 and obtains a received data signal from terminal 200 (UL data signal).

[0100] In the example shown in FIG. 9, the base station 100 includes the interval setting unit 101 and the resource pool setting unit 102, and generates higher layer signaling including the interval candidate information and the resource pool setting information. However, the present invention is not limited to this. For example, at least one of the interval candidate information and the resource pool setting information may be set in an application layer called Pre-configured, or may be set in advance in a subscriber identity module (SIM). In this case, the base station 100 may use the information set in advance without generating the interval candidate information or the resource pool setting information. For example, the base station 100 may recognize slots available between the base station 100 and the terminal 200 based on the resource pool setting information set in advance, and output information indicating slots available between the base station 100 and the terminal 200 to the signal allocation unit 105 and the signal separation unit 108.

[0101] Also, here, a case will be described in which the setting regarding the time resource in the sidelink communication (e.g., information regarding the interval) is set (or notified) from the base station 100 to the terminal 200 by, for example, higher layer signaling (e.g., RRC) or MAC, but is not limited thereto. For example, when the setting regarding the time resource in the sidelink communication (e.g., information regarding the interval) is specified in a specification (or standard) or set in a SIM or application layer, the terminal 200 can operate even without the setting from the base station 100.

[0102] Also, for example, when the mode of sidelink communication is "Mode 1", it is assumed that information included in the SCI transmitted by the terminal in the sidelink is generated by base station 100. Thus, in the case of Mode 1, base station 100 may generate an SCI based on, for example, interval candidate information and resource pool setting information (processing similar to that of SCI generating unit 210 of terminal 200 described later), and transmit the SCI to terminal 200. Note that the SCI may be included, for example, in higher layer signaling or in a physical layer signal (for example, PDCCH).

[0103] [Device configuration] Fig. 10 is a block diagram showing an example of the configuration of terminal 200 according to this embodiment. In Fig. 10, terminal 200 has receiving section 201, signal separating section 202, SCI receiving section 203, Uu demodulating section 204, Uu error correction decoding section 205, SL demodulating section 206, SL error correction decoding section 207, interval setting section 208, resource pool setting section 209, SCI generating section 210, Uu error correction encoding section 211, Uu modulating section 212, SL error correction encoding section 213, SL modulating section 214, signal allocating section 215, and transmitting section 216.

[0104] 8 may include, for example, an SCI receiving unit 203, an interval setting unit 208, a resource pool setting unit 209, and an SCI generating unit 210. Furthermore, the communication circuit shown in FIG 8 may include, for example, a receiving unit 201 and a transmitting unit 216.

[0105] The receiving unit 201 receives a reception signal via an antenna, performs reception processing such as down-conversion, and outputs the received signal to the signal separating unit 202 .

[0106] Furthermore, the receiving unit 201 identifies a time resource for receiving a sidelink signal transmitted from a certain terminal 200 (in other words, a transmitting terminal) based on, for example, interval information (described later) input from the SCI receiving unit 203. The receiving unit 201 may set the state of the terminal 200 to a receiving state in the identified time resource, for example.

[0107] Based on the resource pool setting information input from the resource pool setting unit 209, the signal separation unit 202 separates the signal components corresponding to the link (e.g., Uu link) between the base station 100 and the terminal 200 from the signal input from the receiving unit 201, and outputs the signal components to the Uu demodulation unit 204.

[0108] Furthermore, based on the resource pool setting information, the signal separating unit 202 separates side link signal components from the signals input from the receiving unit 201. Then, the signal separating unit 202 outputs, for example, a PSCCH signal from the side link signal components to the SCI receiving unit 203. Furthermore, based on the resource allocation information input from the SCI receiving unit 203, the signal separating unit 202 separates a PSSCH signal addressed to the terminal 200 from the side link signal components input from the receiving unit 201, and outputs the PSSCH signal to the SL demodulating unit 206.

[0109] The SCI receiving unit 203 demodulates and decodes the signal component of the PSCCH input from the signal separating unit 202. For example, the SCI receiving unit 203 attempts to demodulate and decode the PSCCH signal, and if the decoding is successful (in other words, if the SCI included in the PSCCH is detected), the SCI receiving unit 203 outputs resource allocation information of the PSSCH addressed to the terminal 200, which is included in the SCI, to the signal separating unit 202. Note that the SCI receiving unit 203 may determine whether or not the information included in the SCI is addressed to the terminal 200, based on, for example, destination information included in the SCI.

[0110] Furthermore, the SCI receiving unit 203 specifies, for example, an interval of a time resource to which a PSSCH addressed to the terminal 200 is allocated. For example, the SCI receiving unit 203 may determine the interval based on information such as interval candidate information input from the interval setting unit 208, a "resource reservation" included in the SCI addressed to the terminal 200, or information related to interval determination (described later). The SCI receiving unit 203 outputs information indicating the determined interval (for example, interval information) to the receiving unit 201.

[0111] The Uu demodulation unit 204 performs demodulation processing on the signal input from the signal separation unit 202 , and outputs the obtained demodulated signal to the Uu error correction decoding unit 205 .

[0112] The Uu error correction decoding unit 205 decodes the demodulated signal input from the Uu demodulation unit 204, outputs the obtained upper layer signaling to the interval setting unit 208 and the resource pool setting unit 209, and outputs the obtained received data signal (or called the Uu received data signal).

[0113] The SL demodulation unit 206 performs demodulation processing on the signal input from the signal separation unit 202 , and outputs the resulting demodulated signal to the SL error correction decoding unit 207 .

[0114] The SL error correction decoding unit 207 decodes the demodulated signal input from the SL demodulation unit 206, and performs error detection, such as a cyclic redundancy check (CRC), on the decoded signal. If there is no error in the decoded signal, the SL error correction decoding unit 207 outputs the obtained received data signal (or referred to as a side link received data signal).

[0115] The interval setting unit 208 sets interval candidates for a side link signal (e.g., TB) transmitted by the terminal 200, based on, for example, interval candidate information included in higher layer signaling input from the Uu error correction decoding unit 205. The interval setting unit 208 outputs interval candidate information indicating the set interval candidates to the SCI receiving unit 203 and the SCI generating unit 210.

[0116] The resource pool setting unit 209 sets a resource pool (for example, time resources and frequency resources) to be used by the terminal 200 for the side link, based on, for example, resource pool setting information included in higher layer signaling input from the Uu error correction decoding unit 205. The set resource pool may include, for example, either or both of resources to be used by the terminal 200 for transmission and resources to be used by the terminal 200 for reception. The resource pool setting unit 209 outputs the resource pool setting information to the SCI generating unit 210, the signal separating unit 202, and the signal allocating unit 215.

[0117] The SCI generating unit 210 generates an SCI including information on the set resources based on, for example, information input from the resource pool setting unit 209 (for example, information indicating resources available for side link) and information input from the interval setting unit 208. The SCI generating unit 210 may determine, for example, information on the interval (for example, a value of "resource reservation") or a frequency resource. The SCI may include, for example, information on the determined resources, information identifying the source terminal 200 (for example, a source ID), and information identifying the destination terminal 200 (for example, a destination ID). The SCI generating unit 210 outputs the generated SCI to the signal allocation unit 215.

[0118] For example, when the sidelink communication mode is "Mode 2", terminal 200 generates an SCI in SCI generation unit 210. Furthermore, for example, when base station 100 generates an SCI and transmits the SCI to terminal 200 when the sidelink communication mode is "Mode 1", terminal 200 may generate the SCI based on the SCI transmitted from base station 100.

[0119] The Uu error correction encoder 211 receives a transmission data signal (UL data signal) of the Uu link, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the Uu modulator 212 .

[0120] The Uu modulation unit 212 modulates the signal input from the Uu error correction coding unit 211 , and outputs the modulated signal to the signal allocation unit 215 .

[0121] The SL error correction encoding unit 213 receives a side link transmission data signal (side link data signal) as input, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the SL modulation unit 214.

[0122] The SL modulation unit 214 modulates the signal input from the SL error correction coding unit 213 and outputs the modulated signal to the signal allocation unit 215.

[0123] The signal allocating unit 215 allocates the PSCCH signal including the SCI and the PSSCH signal including the side link data signal input from the SL modulating unit 214 to side link resources based on, for example, information input from the resource pool setting unit 209 and information input from the SCI generating unit 210. Also, the signal allocating unit 215 allocates, for example, the signal input from the Uu modulating unit 212 to Uu link resources (for example, uplink data channel (PUSCH: Physical Uplink Shared Channel)). The signal allocating unit 215 outputs the signal allocated to the resources to the transmitting unit 216.

[0124] The transmitter 216 performs radio transmission processing such as up-conversion on the signal input from the signal allocation unit 215 and transmits the signal.

[0125] In the example shown in FIG. 10, the terminal 200 receives higher layer signaling including interval candidate information and resource pool setting information, but the present invention is not limited to this. For example, at least one of the interval candidate information and the resource pool setting information may be configured in an application layer called Pre-configured, or may be configured in advance in a SIM. In this case, the terminal 200 may use the information configured in advance without receiving the interval candidate information or the resource pool setting information. For example, the terminal 200 may recognize resources available between the base station 100 and the terminal 200 and resources available for a side link based on the resource pool setting information configured in advance, and may use information on these resources in the signal separation unit 202 and the signal allocation unit 215.

[0126] In addition, in FIG. 10, as an example, a case has been described in which the demodulation unit, error correction decoding unit, error correction encoding unit, and modulation unit have different components for the Uu link and the side link, but this is not limited to the above, and the Uu link and the side link may have common components.

[0127] [Operation of terminal 200] Next, an example of the operation of the terminal 200 (see FIG. 10) will be described.

[0128] FIG. 11 is a flowchart showing an example of processing by the terminal 200.

[0129] The terminals 200 (e.g., a transmitting terminal and a receiving terminal) that transmit and receive in the sidelink configure parameters related to the sidelink (S101). The parameters related to the sidelink may include, for example, a time resource (e.g., an interval between TBs), a frequency resource, a SL BWP, a resource pool, and a channel configuration to be allocated to each slot.

[0130] The parameters related to the side link may be notified from the transmitting terminal to the receiving terminal by, for example, the SCI. Alternatively, the parameters related to the side link may be defined for the terminal 200 in, for example, a specification (or a standard), may be configured in an application layer called "pre-configured," may be pre-configured in the SIM, or may be configured by a SIB called "configured" or other higher layers such as RRC or MAC.

[0131] The terminal 200 performs sidelink communication (for example, data transmission / reception) based on the set parameters (S102).

[0132] Next, an example of a method for setting time resources (eg, intervals between TBs) will be described.

[0133] [Example 1-1] In the operation example 1-1, for example, the value "X" for notifying the interval between TBs is set to a value obtained by dividing the value of the interval between TBs by W.

[0134] Also, in the operational example 1-1, for example, W may be selected from among a plurality of candidates.

[0135] For example, terminal 200 determines the multiplication value of X notified by "resource reservation" and the selected W (for example, X×W) as the interval between TBs.

[0136] The value of the interval between TBs may be notified (or set) by a higher layer to terminal 200. The value of W (e.g., candidates for W) may be, for example, specified in a specification (or standard), may be set in an application layer called pre-configured, may be set in a SIM included in terminal 200, may be set in a higher layer such as an SIB called configured or other RRC, or may be set in a MAC.

[0137] Furthermore, when multiple candidates for W are set, for example, information indicating the value of W that terminal 200 uses (in other words, selects) from the multiple candidates for W may be included in the SCI.

[0138] Alternatively, multiple candidates for W may be preset for terminal 200, for example. In this case, options for W may be notified to terminal 200 by signaling of a higher layer such as RRC or MAC. For example, terminal 200 may select a candidate notified by SCI from among the candidates for W included in the options. Also, for example, when there is only one option for W notified by signaling of a higher layer, information for selecting W may not be notified by SCI.

[0139] In the operation example 1-1, by combining X and W, the number of interval candidates can be increased without increasing the number of candidates for X, as compared to, for example, LTE. Therefore, according to the operation example 1-1, for example, the interval candidates can be dynamically set according to the value of W, so that data transmission of various traffic types can be supported.

[0140] For example, when the value of W has two patterns, terminal 200 may notify other terminals 200 of an SCI including one bit of information indicating one of the two patterns. Also, when the value of W has three or four patterns, terminal 200 may notify other terminals 200 of an SCI including two bits of information indicating one of the three or four patterns. The number of information bits for notifying candidates for W may be three or more bits. Also, the number of information bits notified by the SCI may be determined according to the number of candidates for W (in other words, the number of patterns).

[0141] FIG. 12 shows an example in which the value of W is notified by 1-bit information (for example, 0 or 1) included in the SCI.

[0142] In Fig. 12, candidates for W are set to W=100, which is the same as LTE, and W=20, which is shorter than LTE. For example, as shown in Fig. 12, W=100 is notified by bit 0, and W=20 is notified by bit 1. Note that the candidates for W are not limited to the examples shown in Fig. 12 (W=100 or 20), and other values ​​may be used.

[0143] In FIG. 12, for example, in the case of bit 0, the interval between TBs is set to 20 ms, 50 ms, or 100Xms (X times 100, where X is any integer from 1 to 10). Also, in FIG. 12, for example, in the case of bit 1, the interval between TBs is set to 4 ms, 10 ms, or 20Xms (X times 20, where X is any integer from 1 to 10). Therefore, in FIG. 12, more intervals and a wider range of intervals can be set compared to, for example, FIG. 7.

[0144] FIG. 13 shows an example in which the value of W is notified by 2-bit information (eg, any one of 00, 01, 10, and 11) included in the SCI.

[0145] In Fig. 13, candidates for W are set to W=100, which is the same as LTE, and W=5, W=25, and W=40, which are shorter than those in LTE. For example, as shown in Fig. 13, W=100 is notified by bit 00, W=5 is notified by bit 01, W=25 is notified by bit 10, and W=40 is notified by bit 11. Note that the candidates for W are not limited to the examples shown in Fig. 13 (W=100, 5, 25, or 40), and other values ​​may be used.

[0146] In FIG. 13, for example, in the case of bit 00, the interval between TBs is set to 20 ms, 50 ms, or 100Xms (X times 100, where X is any integer from 1 to 10). Also, in FIG. 13, for example, in the case of bit 01, the interval between TBs is set to 1 ms, 2.5 ms, or 5Xms (X times 5, where X is any integer from 1 to 10). Also, in FIG. 13, for example, in the case of bit 10, the interval between TBs is set to 5 ms, 12.5 ms, or 25Xms (X times 25, where X is any integer from 1 to 10). Also, in FIG. 13, for example, in the case of bit 11, the interval between TBs is set to 8 ms, 20 ms, or 40Xms (X times 40, where X is any integer from 1 to 10).

[0147] For example, if a period of 2.5 ms is not assumed in the side link, the TB interval of 2.5 ms in bit 01 (W=5) shown in Fig. 13 may be read as 2 ms or 3 ms. Similarly, if a period of 12.5 ms is not assumed in the side link, the TB interval of 12.5 ms in bit 10 (W=25) shown in Fig. 13 may be read as 12 ms or 13 ms.

[0148] In FIG. 13, more intervals and a wider range of intervals can be set compared to, for example, FIG. 7 or FIG.

[0149] In this way, in the operation example 1-1, by making the value of W variable, the interval between TBs can be flexibly set, and various traffic cycles can be accommodated.

[0150] As an example, the case where the interval between TBs is calculated using the tables shown in Figures 12 and 13 has been described, but the present invention is not limited to this. For example, the interval may be calculated based on a bit (e.g., resource reservation) notified by the SCI, the value of W, and the table shown in Figure 7. For example, when the table shown in Figure 7 is used, the value of W may be set to a value other than 100. For example, when the value of W is set to a multiple of 5, the interval (in other words, the transmission period) can be set to a multiple of 1 ms.

[0151] 12 and 13, by setting the value of W to 100 (for example, the same value as in LTE) or less, the interval can be set to a value smaller than 20 ms (for example, the minimum value in LTE). Note that although the case where the value of W is set to 100 (for example, the same value as in LTE) or less has been described in FIGS. 12 and 13, the value of W may be larger than 100. By setting W in this way, for example, the interval can be set to be longer than 1000 ms (for example, the maximum value in LTE).

[0152] [Example 1-2] In the operation example 1-2, for example, a plurality of candidates for the association (pattern of X, for example, represented by a table) between a value “X” notifying an interval between TBs and information indicating X (for example, resource reservation) are set.

[0153] For example, the pattern of X signaled by the SCI may be selected from among one or more candidates (eg, multiple tables).

[0154] For example, terminal 200 refers to the selected pattern of X and determines the multiplication value (for example, X×W) of X notified by "Resource reservation" and W set in terminal 200 as the interval between TBs. The value of W may be, for example, a fixed value, or may be a variable value as in operation example 1-1.

[0155] In addition, multiple candidates for the pattern of X (e.g., a table) may be specified in a specification (or standard), may be set in an application layer called pre-configured, may be set in a SIM provided in terminal 200, may be set in a higher layer such as an SIB or other RRC called configured, or may be set in MAC.

[0156] Furthermore, when multiple pattern candidates for X are set, for example, information indicating which of the multiple candidates terminal 200 uses (in other words, selects) may be included in the SCI.

[0157] Alternatively, the pattern of X may be preset for terminal 200, for example. In this case, options of the pattern of X may be notified to terminal 200 by signaling of a higher layer such as RRC or MAC. For example, terminal 200 may select a combination notified by SCI from among combinations included in the options. Also, for example, when there is only one option of the combination notified by signaling of the higher layer, information for selecting the combination may not be notified by SCI.

[0158] In the operation example 1-2, by setting a plurality of types of patterns of X, the number of interval candidates can be increased, for example, compared to LTE. Therefore, according to the operation example 1-2, for example, the interval candidates can be dynamically set according to the pattern of X, so that data transmission of various traffic types can be supported.

[0159] For example, when the pattern of X is two patterns, the terminal 200 may notify the other terminal 200 of an SCI including one bit of information indicating one of the two patterns. Also, when the pattern of X is three or four patterns, the terminal 200 may notify the other terminal 200 of an SCI including two bits of information indicating one of the three or four patterns. The number of bits of the information notifying the pattern of X may be three or more bits. Also, the number of bits of the information notified by the SCI may be determined according to the number of patterns of X.

[0160] An example of a case where there are two patterns of X (in other words, a case where the pattern of X is notified by 1-bit information) will be described below.

[0161] The two types of patterns of X are, for example, the patterns shown in Fig. 7 and the patterns shown in Fig. 14. In Fig. 7 and Fig. 14, "W", which is a value by which the interval value is divided to calculate X or a value by which X is multiplied to calculate the interval value, may be set to, for example, 100, similarly to LTE.

[0162] For example, bit 0 included in the SCI may indicate the pattern of X shown in FIG. 7 (e.g., combinations of X=0, 0.2, 0.5, and 1 to 10), and bit 1 included in the SCI may indicate the pattern of X shown in FIG. 14 (e.g., combinations of X=0, 0.05, 0.1, 0.2, 0.25, 0.4, 0.5, and 1 to 5).

[0163] For example, in the case of bit 0 (FIG. 7), the interval between TBs is set to 20 ms, 40 ms, or 100Xms (X times 100, where X is any integer from 1 to 10). Also, in the case of bit 1 (FIG. 14), the interval between TBs is set to 5 ms, 10 ms, 20 ms, 25 ms, 40 ms, 50 ms, or 100Xms (X times 100, where X is any integer from 1 to 5). Therefore, in operation example 1-2, more intervals and a wider range of intervals can be set compared to the interval settings in LTE (FIG. 7), for example.

[0164] In the above example, the case where the value of W is set to 100 has been described, but the value of W may be a value other than 100, and may be selected from among a plurality of candidates.

[0165] For example, the value of W may differ for each pattern of X. For example, when W=20 is set in Fig. 14, the intervals between TBs are set to 1 ms, 2 ms, 4 ms, 5 ms, 8 ms, 10 ms, and 20X ms (X times 20, where X is any integer from 1 to 5). The combination of the pattern of X and the value of W may be, for example, specified in advance, or may be notified to terminal 200 by another bit (for example, information included in SCI) as in operation example 1-1.

[0166] Also, for example, at least one of the patterns of X may include a value smaller than the value of X (for example, X=0.2) shown in Fig. 7, such as X=0.1 or 0.05, as shown in Fig. 14. This setting of X allows a shorter interval to be set compared to the case of Fig. 7 (for example, the case of LTE).

[0167] Also, for at least one of the patterns of X, the granularity of X may be set finer than that of Fig. 7, for example, as shown in Fig. 14. For example, three values ​​are set in the range of X=0 to 0.5 in Fig. 7, whereas seven values ​​are set in the range of X=0 to 0.5 in Fig. 14. With this setting, it is possible to increase the values ​​that can be supported in the range in which the interval is set, compared to, for example, the case of Fig. 7 (for example, the case of LTE).

[0168] In this way, in operation example 1-1 and operation example 1-2, the transmitting terminal determines information (e.g., resource reservation included in SCI) indicating the value "X" obtained by dividing the time interval between TBs by W. The transmitting terminal also determines the value of W (e.g., operation example 1-1), and information (e.g., a bit included in SCI) indicating at least one of the candidates when there are multiple candidates for at least one of the associations between X and resource reservation (e.g., operation example 1-2). Based on this, the transmitting terminal determines the time interval between TBs. Then, the transmitting terminal transmits the determined information to the receiving terminal.

[0169] The receiving terminal receives, for example, information including X (for example, resource reservation included in SCI). The receiving terminal also receives information (for example, a bit included in SCI) indicating at least one candidate for the value of W (for example, operation example 1-1) and the association between X and resource reservation (for example, operation example 1-2) when there are multiple candidates for at least one of the above. Then, the receiving terminal determines the interval between TBs (for example, X×W) based on the received information.

[0170] For example, since the pattern of W or X can be dynamically set using information indicating candidates for at least one of the value of W and the pattern of X, terminal 200 can dynamically set interval candidates and support data transmission of various traffic types.

[0171] In operation example 1-1 and operation example 1-2, a method of notifying "resource reservation" that notifies an interval between TBs has been described, but operation example 1-1 and operation example 1-2 can also be applied to a method of notifying "time gap between initial transmission and retransmission."

[0172] [Example 1-3] In operation example 1-3, the interval between TBs is set based on either the time interval (in other words, the interval) notified by "Resource reservation" or the time interval (in other words, the gap) notified by "Time gap between initial transmission and retransmission".

[0173] For example, terminal 200 may notify other terminals 200 of an SCI including information indicating which time interval, "resource reservation" or "time gap between initial transmission and retransmission", will be used to set (in other words, notify) the interval between TBs.

[0174] According to the operation example 1-3, similarly to the operation examples 1-1 and 1-2, interval candidates can be dynamically changed, and data transmission of various traffic types can be supported.

[0175] For example, the time interval (e.g., interval or gap) used to set the interval between TBs may be notified by one bit of information (bit 0 or bit 1, e.g., an additional bit) included in the SCI. For example, when bit 0 is notified, terminal 200 may set the interval between TBs based on the time interval (e.g., interval) notified by "Resource reservation". Also, when bit 1 is notified, terminal 200 may set the interval between TBs based on the time interval (e.g., gap) notified by "Time gap between initial transmission and retransmission".

[0176] In the operation example 1-3, for example, the set interval may be applied to the interval between TBs of the initial transmission, and may be applied to the interval between the TB of the initial transmission and the TB of the retransmission. The terminal 200 can distinguish between the initial transmission and the retransmission, for example, based on the "Retransmission index".

[0177] For example, when the time period of traffic is long (e.g., equal to or greater than a threshold), terminal 200 may set the time interval (e.g., interval) notified by "Resource reservation" as the interval between TBs. Also, when the time period of traffic is short (e.g., less than a threshold), terminal 200 may set the time interval (e.g., gap) notified by "Time gap between initial transmission and retransmission", which is a time interval shorter than the time interval notified by resource reservation, as the interval between TBs.

[0178] In the operation example 1-3, for example, since multiple candidates for W as in the operation example 1-1 or multiple patterns for X as in the operation example 1-2 are not set, it is possible to reduce signaling related to the setting of time resources.

[0179] Also, as a modified example of operation example 1-3, when bit 0 is notified, terminal 200 may, for example, set the interval between TBs of the initial transmission to the time interval notified by "Resource reservation", as shown in FIG. 6, and set the gap between the initial transmission and retransmission to the interval that is the time interval notified by "Resource reservation".

[0180] [Example 1-4] In the operation example 1-4, the interval between TBs is set based on the time interval (in other words, the interval) notified by "Resource reservation."

[0181] For example, terminal 200 may notify other terminals 200 of an SCI that includes information indicating whether the time interval notified by "Resource reservation" is a value determined according to either the method of determining the time interval, "Resource reservation", or "Time gap between initial transmission and retransmission", specified in LTE-V2X, when setting (in other words, notifying) the interval between TBs.

[0182] According to the operation example 1-4, similarly to the operation examples 1-1, 1-2, and 2-3, the interval candidates can be dynamically changed, and data transmission of various traffic types can be supported. In addition, the LTE-V2X specification can be utilized to the maximum extent.

[0183] For example, a time interval (e.g., interval or gap) used to set an interval between TBs may be notified by 1-bit information (bit 0 or bit 1, e.g., an additional bit) included in the SCI. For example, when bit 0 is notified, terminal 200 may set the time interval (e.g., interval) notified by "Resource reservation" in a similar procedure to "Resource reservation" in the LTE-V2X specifications. Also, when bit 1 is notified, terminal 200 may set the time interval (e.g., interval) notified by "Resource reservation" in a similar procedure to "Time gap between initial transmission and retransmission" in the LTE-V2X specifications.

[0184] In the operation example 1-4, for example, the set interval may be applied to the interval between TBs of the initial transmission, and may be applied to the interval between the TB of the initial transmission and the TB of the retransmission. The terminal 200 can distinguish between the initial transmission and the retransmission, for example, based on the "Retransmission index".

[0185] For example, when the time period of the traffic is long (e.g., equal to or greater than a threshold), terminal 200 may set the time interval (e.g., interval) notified by "Resource reservation" in a similar procedure to "Resource reservation" in the LTE-V2X specifications. Also, when the time period of the traffic is short (e.g., less than a threshold), terminal 200 may set the time interval (e.g., interval) notified by "Resource reservation" in a similar procedure to "Time gap between initial transmission and retransmission" in the LTE-V2X specifications.

[0186] In the operation example 1-4, for example, since multiple candidates for W as in the operation example 1-1 or multiple patterns for X as in the operation example 1-2 are not set, it is possible to reduce signaling related to the setting of time resources.

[0187] In addition, the information indicating the method of determining the time interval used to set the interval between TBs is not limited to being explicitly notified by information included in the SCI (e.g., 1-bit information), but may also be implicitly notified by, for example, information specified for other purposes.

[0188] Operational example 1-1 to operation example 1-4 have been described above.

[0189] According to this embodiment, even when there are more diverse traffic types than in LTE, such as in NR, terminal 200 can dynamically set the interval between TBs from among multiple time interval candidates. Therefore, according to this embodiment, it is possible to improve the efficiency of resource allocation (e.g., time resource allocation or reservation) in wireless communication (e.g., sidelink communication).

[0190] (Embodiment 2) In the first embodiment (for example, operation example 1-1 and operation example 1-2), a method for explicitly notifying the value of W or the pattern of X (for example, the table shown in FIG. 7 or FIG. 14) by a bit included in the SCI has been described. In contrast, in the present embodiment, a method for implicitly notifying the value of W or the pattern of X will be described.

[0191] According to this embodiment, it is possible to increase the number of settable intervals without increasing the number of SCI bits.

[0192] A base station and a terminal according to the present embodiment have a basic configuration in common with base station 100 and terminal 200 according to the first embodiment.

[0193] An example of a method for setting time resources (eg, intervals between TBs) according to this embodiment will be described below.

[0194] [Example 2-1] In the operation example 2-1, the "priority indication" or "QoS indication" included in the SCI is used to notify the interval between TBs. Note that, although it is called a priority indication in LTE, it may be called a different name (e.g., "QoS indication") in the SCI of NR.

[0195] It is considered that the priority indication or the QoS indication includes information such as priority, latency, or reliability. Based on the priority indication or the QoS indication, control such as resource allocation, congestion control between terminals, a transmission method when multiple data are generated in a terminal (resolution of in-device coexistence issues), or transmission power control is considered.

[0196] In the operation example 2-1, the terminal 200 may determine the value of W or the pattern of X based on, for example, the Priority indication or the QoS indication. In other words, information included in the Priority indication or the QoS indication is associated with candidates for the value of W or the pattern of X.

[0197] For example, the terminal 200 identifies the amount of delay required for the terminal 200 (in other words, the desired amount of delay) based on the Priority indication or the QoS indication.

[0198] Then, when the identified delay amount is short (e.g., less than a threshold), terminal 200 may set the interval between TBs, for example, based on W=20 in operation example 1-1 or Fig. 14 in operation example 1-2. Also, when the identified delay amount is long (e.g., equal to or greater than a threshold), terminal 200 may set the interval between TBs, for example, based on W=100 in operation example 1-1 or Fig. 7 in operation example 1-2.

[0199] For example, by applying W=20 or the pattern of X shown in FIG. 14, the interval between TBs can be set shorter than when W=100 or the pattern of X shown in FIG. 7, so that the delay required for terminal 200 can be easily satisfied.

[0200] The mapping between the Priority indication or QoS indication and the value of W (e.g., W=20 or 100) or the pattern of X (e.g., the table shown in FIG. 7 or FIG. 14) may be specified in a specification (or standard), may be configured in the SIM, may be configured in the application layer called pre-configured, or may be configured in a SIB or other higher layers such as RRC or MAC called configured.

[0201] According to the operation example 2-1, the terminal 200 can notify the interval between TBs without using a new bit. Also, for example, the terminal 200 can set an interval suitable for a parameter (for example, a required delay amount) corresponding to a value set in LTE.

[0202] [Example 2-2] In the operation example 2-2, the redundancy version (RV) included in the SCI is used to notify the interval between TBs.

[0203] In LTE, there is no RV notification by SCI. On the other hand, in NR, retransmission control by notification of RV and New Data Indicator (NDI) is being considered in SCI, similar to downlink control indication (DCI).

[0204] For example, as shown in Fig. 15, a bit string in which parity bits are added to systematic bits of a transport block size (TBS: TB size) determined by an instruction of MCS is stored in a circular buffer. In the example shown in Fig. 15, parity bits of approximately twice the length of systematic bits are added. Also, in the example shown in Fig. 15, the circular buffer is divided into four.

[0205] "RV" is a signal that notifies the bit position (e.g., RV0, RV1, RV2, or RV3) from which data transmission starts in the circular buffer. For example, as shown in FIG. 15, RV0 generally starts the transmission bits from a bit position near the beginning of the systematic bits (e.g., a bit position shifted by several bits from the beginning). Also, the number of bits that can be transmitted in one transmission determines the bits that can be transmitted from the start position of the circular buffer.

[0206] For example, when RV0 is notified, since the transmission bits include more systematic bits compared to the other RVs, RV0 is likely to be set (in other words, selected) at the time of the first transmission.

[0207] Also, in the case of retransmission, for example, in a situation where terminal 200 can receive the signal of the initial transmission, if bits that do not overlap with the initial transmission are transmitted, this becomes a retransmission method called "incremental redundancy", and reception quality can be improved. Therefore, in the case of retransmission, RV1, RV2, or RV3 that does not overlap with the initial transmission (for example, RV0) is likely to be selected. Also, for example, as shown in FIG. 15, RV2 has less overlap with RV0 in the bit sequence compared to RV1 and RV3 that are adjacent to RV0. Also, for example, the more bits that can be transmitted in one transmission (in other words, the longer the bit sequence), the more systematic bits can be included in RV3.

[0208] Considering such RV characteristics, for example, the more bits that can be transmitted in one transmission, the more likely it is that a bit string corresponding to RV3 or RV1 shown in Fig. 15 will be included in a bit string corresponding to RV0 or RV2. In other words, for example, in Fig. 15, terminal 200 (e.g., receiving terminal) can receive bits included in a bit string corresponding to RV3 or RV1 by receiving a bit string corresponding to RV0 or RV2.

[0209] Therefore, even if a portion (e.g., one) of the multiple RVs is used to notify W in operation example 1-1 or to notify a pattern (e.g., a table) of X in operation example 1-2, it is expected that the reception characteristics at terminal 200 will not deteriorate.

[0210] Therefore, in operation example 2-2, terminal 200 may determine, for example, based on RV, the value of W or the pattern of X. In other words, RV is associated with the value of W or the pattern of X.

[0211] As an example 1 of the operation example 2-2, the terminal 200 may notify the interval between TBs using the bit used for notifying RV3 as follows. Note that, in the following, as an example, RV0 is notified by bit 00, RV1 is notified by bit 01, RV2 is notified by bit 10, and RV3 is notified by bit 11.

[0212] In example 1, bit 11 may signal, instead of RV3, a different value interval and RV0 than for other bits (e.g., bits 00, 01, and 10): For example, bit 11 may be associated with a shorter interval (e.g., W=20 or the pattern of Xs in FIG. 14) compared to bits 00, 01, and 10 (e.g., W=100 or the pattern of Xs in FIG. 7), as follows: 00: RV0 and W=100 (or Figure 7) 01: RV1 and W=100 (or Figure 7) 10: RV2 and W=100 (or Fig. 7) 11: RV0 and W=20 (or Fig. 14)

[0213] For example, when the interval is long (for example, when W=100 or the pattern X in FIG. 7 is applied), any of RV0, RV1, and RV2 can be set, whereas when the interval is short (for example, when W=20 or the pattern X in FIG. 14 is applied), only RV0 can be set. However, it is assumed that the shorter the interval, the shorter the desired delay for a packet, for example. Therefore, it is assumed that the shorter the interval, the more redundantly the signal at the time of the initial transmission is transmitted, and therefore, the more likely it is that the receiving terminal can receive the signal at the initial transmission (in other words, the more successful the reception). For this reason, as described above, even if the only RV that can be set when the interval is short is RV0, the retransmission efficiency is unlikely to deteriorate.

[0214] In Example 1, the case where bit 11 corresponding to RV3 is used for notifying an interval different from the bits corresponding to other RVs has been described, but for notifying an interval different from the bits corresponding to other RVs (e.g., RV1), a bit corresponding to an RV other than RV3 may be used. Also, in Example 1, the case where the interval different from others is shorter than the other intervals has been described, but it may be longer than the other intervals.

[0215] Also, as Example 2 of Operation Example 2-2, two of the multiple RVs (e.g., RV1 and RV3) may be used to notify W in Operation Example 1-1 or to notify a pattern (e.g., table) of X in Operation Example 1-2. In the case of Example 2, RV1 and RV3 are not set, and RV0 or RV2 may be set instead, as follows. 00: RV0 and W=100 (or Figure 7) 01: RV0 and W=20 (or Fig. 14) 10: RV2 and W=100 (or Fig. 7) 11: RV2 and W=20 (or Fig. 14)

[0216] In this way, even if different intervals are signaled instead of two RV states (e.g., RV1 and RV3), the RV can be changed during retransmission at each of the different intervals (e.g., W=20 and W=100, respectively).

[0217] [Example 2-3] In the operation example 2-3, the "RV" and "Retransmission index" included in the SCI are used to notify the interval between TBs.

[0218] The retransmission index is information that indicates whether it is an initial transmission or a retransmission.

[0219] In operation example 2-3, terminal 200 may determine the value of W or the pattern of X based on, for example, RV and retransmission index (for example, information instructing data retransmission). In other words, a combination of RV and retransmission index (transmission type) is associated with a candidate value of W or a pattern of X.

[0220] For example, by restricting the types of RV that can be used depending on the initial transmission and retransmission, the pattern W in the operation example 1-1 or the pattern X in the operation example 1-2 is notified instead.

[0221] For example, in a three-bit bit string consisting of a two-bit RV and a one-bit retransmission index, the first two bits are used for the RV, and the last bit is used for the retransmission index. For example, the retransmission index (for example, the third bit of the three bits) indicates initial transmission when it is 0, and indicates retransmission when it is 1. For example, the RV is set to either RV0 or RV3 at the time of initial transmission, and is set to either RV2 or RV1 at the time of retransmission.

[0222] In this case, the RV, interval, and transmission type (initial transmission or retransmission) may be set for a 3-bit bit string (for example, 000 to 111) as follows. 000: RV0, W=100 (or Figure 7) and first transmission 001: RV2, W=100 (or Fig. 7) and retransmit 010: RV0, W= 20 (or Fig. 14) and first transmission 011: RV2, W= 20 (or Fig. 14) and retransmit 100: RV3, W=100 (or Fig. 7) and first transmission 101: RV1, W=100 (or Fig. 7) and retransmission 110: RV3, W= 20 (or Fig. 14) and first transmission 111: RV1, W= 20 (or Fig. 14) and retransmit

[0223] For example, at the time of initial transmission, RV0 or RV3 is selected, which is likely to include more systematic bits than RV1 and RV2, and at the time of retransmission, RV1 or RV2 is selected, which is likely to include more parity bits that were not included in the initial transmission.

[0224] According to operation example 2-3, the number of selectable RVs for each of the initial transmission and retransmission is reduced, but since RVs suitable for each of the initial transmission and retransmission are included in the options, degradation of reception quality in terminal 200 can be suppressed.

[0225] [Example 2-4] In the operation example 2-4, the HARQ process number (also called the HARQ process ID) included in the SCI is used to notify the interval between TBs.

[0226] In NR, support for multiple processes is being considered, and the HARQ process ID can be signaled by the SCI.

[0227] In operation example 2-4, terminal 200 may determine, for example, based on an HARQ process ID, a value of W or a pattern of X. In other words, an HARQ process ID is associated with a candidate value of W or a pattern of X.

[0228] For example, the value of W in the operation example 1-1 or the pattern of X in the operation example 1-2 (for example, a table) may be set for each HARQ process.

[0229] In addition, the configuration method for each HARQ process may be, for example, specified in a specification (or standard), may be pre-configured in the SIM, may be configured in an application layer called pre-configured, or may be configured in a higher layer such as an SIB or other RRC or MAC called configured.

[0230] For example, the longer the interval, the fewer the number of HARQ processes may be allocated for that interval, or in other words, the shorter the interval, the more the number of HARQ processes may be allocated for that interval.

[0231] Therefore, for example, for HARQ process #0, W=100 in operation example 1-1 or the combination of X candidates shown in FIG. 7 in operation example 1-2 may be set, and for other HARQ process IDs, W=20 in operation example 1-1 or the combination of X candidates shown in FIG. 14 in operation example 1-2 may be set.

[0232] The above-mentioned association between the HARQ process ID and the candidate pattern of W or X is merely an example and is not limiting. For example, the number of HARQ process IDs associated with W=100 in the operation example 1-1 or the pattern of X shown in FIG. 7 in the operation example 1-2 may be multiple.

[0233] Terminal 200 can obtain parameters for setting the interval between TBs based on, for example, the HARQ process ID included in the SCI.

[0234] Operational examples 2-1 to 2-4 have been described above.

[0235] In addition, any two or more of the operation examples 2-1 and 2-4 may be combined.

[0236] In this embodiment, the interval between TBs is implicitly notified by information defined for other purposes. Therefore, according to this embodiment, for example, in the side link, in order to notify the interval between TBs, it is not necessary to add new information to the parameters defined in LTE, for example, so that the signaling overhead can be reduced.

[0237] (Embodiment 3) In the LTE SCI, for example, as shown in FIG. 6, the transmission timing is specified based on two time intervals: the interval between TBs (e.g., corresponding to "resource reservation") and the gap between initial transmission and retransmission (e.g., "time gap between initial transmission and retransmission").

[0238] Also, in LTE, for example, the next initial transmission TB (for example, Initial transmission TB#2 in FIG. 6) is given a transmission opportunity after the interval indicated in "Resource reservation" from the current initial transmission TB (for example, Initial transmission TB#1 in FIG. 6). Therefore, for example, the retransmission timing for the current TB (for example, TB#1 in FIG. 6) can be set by the transmission opportunity for the next TB (for example, TB#2 in FIG. 6).

[0239] However, for example, the shorter the interval between TBs notified by "resource reservation", the higher the possibility that the transmission timing of the next TB (e.g., the initial transmission timing) and the transmission timing of the current TB (e.g., the retransmission timing) will overlap.

[0240] Also, in NR, the NDI is signaled by the SCI, which may signal multiple retransmissions and the transmission of a new TB (e.g., the next TB) depending on whether the NDI is toggling or not.

[0241] In addition, in NR, feedback of HARQ using PSFCH is also under consideration. When ACK (in other words, no error) is confirmed by feedback using PSFCH, for example, the transmitting terminal does not need to secure resources for retransmission. Therefore, in feedback using PSFCH, for example, when retransmission occurs, it is possible to use resources for initial transmission.

[0242] A base station and a terminal according to the present embodiment have a basic configuration in common with base station 100 and terminal 200 according to the first embodiment.

[0243] An example of the operation of terminal 200 according to this embodiment will now be described.

[0244] [Example 3-1] In the operation example 3-1, for example, the interval between TBs (in other words, the time interval) set in the terminal 200 is set to the time interval between adjacent TBs in the time domain among the TBs that the terminal 200 communicates with.

[0245] For example, the value of W in the operation example 1-1 or the pattern of X in the operation example 1-2 (for example, a table) is set for the terminal 200. The terminal 200 may determine the interval between TBs based on the set value, for example.

[0246] In addition, the value of W or the combination of candidates for X may be, for example, specified in a specification (or standard), may be set in the SIM, may be set in an application layer called pre-configured, or may be set in a higher layer such as an SIB or other RRC called configured or in a MAC.

[0247] In operation example 3-1, for example, when the interval set in terminal 200 is shorter than a threshold (for example, an interval defined in LTE), "time gap between initial transmission and retransmission" and "Retransmission index" do not need to be included in the SCI.

[0248] For example, when the interval set in terminal 200 is shorter than a threshold, retransmission may be performed based on a transmission timing based on an interval between TBs (for example, a time interval corresponding to a resource reservation). In other words, the timing of retransmission may be set based on, for example, a notification of "resource reservation" and an interval between TBs that is set based on the value of W in operation example 1-1 (or the pattern of X in operation example 1-2).

[0249] FIG. 16 shows an example of resource allocation in the operation example 3-1.

[0250] In Fig. 16, for example, the interval (time interval) between TBs is set to 4 slots by the SCI transmitted in Slot #0. Therefore, as shown in Fig. 16, for example, regardless of the type of TB (e.g., HARQ process) and the transmission type (e.g., initial transmission and retransmission), the interval, which is the time interval between TBs whose transmission timing is adjacent, is the same (e.g., 4 slots).

[0251] For example, in FIG. 16, initial transmission data of HARQ process #0 (e.g., represented as HARQ #0) is allocated to Slot #0, and initial transmission data of HARQ process #1 (e.g., represented as HARQ #1) is allocated to Slot #4.

[0252] Furthermore, in Slot #8 shown in FIG. 16, data of HARQ process #0 is assigned with NDI=0, which is the same as that of the initial transmission (Slot #0). Thus, terminal 200 (for example, a receiving terminal) determines that the data transmission of HARQ process #0 in Slot #8 is a retransmission. Furthermore, in Slot #12 shown in FIG. 16, data of HARQ process #1 is assigned with NDI=1, which is different from that of the initial transmission (slot #4). Thus, terminal 200 (for example, a receiving terminal) determines that the data transmission of HARQ process #1 in Slot #12 is a first transmission. Similarly, in Slot #16 shown in FIG. 16, data of HARQ process #0 is assigned with NDI=1, which is different from that of the retransmission (slot #8). Thus, terminal 200 (for example, a receiving terminal) determines that the data transmission of HARQ process #0 in Slot #16 is a first transmission.

[0253] Note that, although FIG. 16 shows an example in which different TBs are alternately allocated at intervals (e.g., 4 slots), this is not limited thereto, and the initial transmission and retransmission of the same TB may be allocated to adjacent time resources at each interval.

[0254] According to operation example 3-1, data is allocated to a time resource (in other words, an interval) that is set based on, for example, a "resource reservation" regardless of the initial transmission or retransmission, so that resources for retransmission do not need to be reserved separately.

[0255] Also, according to the operation example 3-1, for example, the "time gap between initial transmission and retransmission" and the "Retransmission index" may not be included in the SCI. Therefore, for example, the bits for the "time gap between initial transmission and retransmission" and the "Retransmission index" may be deleted from the SCI to shorten the SCI length. Alternatively, some or all of the bits not used for the "time gap between initial transmission and retransmission" and the "Retransmission index" may be set to a fixed value used for error detection. These SCI settings can improve the reception quality of the SCI.

[0256] Also, some of the bits not used for "time gap between initial transmission and retransmission" and "Retransmission index" may be set to bits for notifying, for example, the value of W in operation example 1-1 or the pattern of X in operation example 1-2. For example, in operation example 1-1, 2 bits (4 patterns) may be used for notifying W, and terminal 200 may select any one of W=5, 10, 15, and 20.

[0257] Furthermore, bits not used for the "time gap between initial transmission and retransmission" and the "Retransmission index" may be used for areas for notifying an NDI or HARQ ID.

[0258] In addition, in the operation example 3-1, the time interval between TBs is set regardless of the TB type and the transmission type, for example, as shown in Fig. 16. Therefore, according to the operation example 3-1, even if the interval between TBs is short (for example, less than a threshold value), it is possible to prevent the transmission timing from overlapping between the current TB and the next TB.

[0259] [Example 3-2] In operation example 3-2, the interval (time interval) between TBs instructed by resource reservation is set to the time interval between the timing of retransmission of TB#N and the timing of initial transmission of TB#N+1, for example, as shown in FIG.

[0260] 17, for example, the time interval (e.g., equivalent to 98 slots) between Slot #2, which is the timing of retransmission of TB #1, and Slot #100, which is the timing of initial transmission of TB #2, is indicated to terminal 200 by resource reservation. Similarly, in FIG. 17, the time interval (e.g., equivalent to 98 slots) between Slot #102, which is the timing of retransmission of TB #2, and Slot #200, which is the timing of initial transmission of TB #3, is indicated to terminal 200 by resource reservation.

[0261] In operation example 3-2, the time interval between the timing of the initial transmission of TB#N and the timing of the initial transmission of TB#N+1 may be set to, for example, a value obtained by adding the interval indicated by the resource reservation and the time interval (in other words, the gap) indicated by "time gap between initial transmission and retransmission". For example, in FIG. 17, the time interval between the timing of the initial transmission of TB#N and the timing of the initial transmission of TB#N+1 is set to 100 slots, which is the sum of the interval indicated by the resource reservation (e.g., 98 slots) and the gap maintained by "time gap between initial transmission and retransmission" (e.g., 2 slots).

[0262] According to operation example 3-2, for example, it becomes possible to notify various intervals depending on the interval indicated by "resource reservation" and the time interval indicated by "time gap between initial transmission and retransmission", thereby improving the flexibility of resource allocation.

[0263] For example, terminal 200 may set the interval indicated by "resource reservation" to be longer than the "time gap between initial transmission and retransmission" and notify the duration of various intervals.

[0264] Also, in operation example 3-2, for example, as shown in Fig. 17, after the initial transmission and retransmission of TB#N, the transmission of the next TB#N+1 is allocated. In other words, in operation example 3-2, the transmission of the next TB#N+1 is not allocated between the initial transmission and retransmission of TB#N. Therefore, according to operation example 3-2, even if the interval between TBs is short (for example, less than a threshold), it is possible to prevent the transmission timing from overlapping between the current TB and the next TB.

[0265] Also, in operation example 3-2, for example, as shown in Fig. 17, the interval between the retransmission timing of TB#N and the initial transmission timing of TB#N+1 transmitted after TB#N is set by resource reservation. Therefore, for example, in operation example 3-2, the interval notified by resource reservation may be shorter compared to LTE (Fig. 6). Therefore, in operation example 3-2, the information notified by resource reservation (for example, interval pattern) may be reduced compared to LTE.

[0266] Operational example 3-1 and operational example 3-2 have been described above.

[0267] Above, the first to third embodiments have been described.

[0268] In the first to third embodiments, a method for setting time resources has been described, whereas in the following fourth to seventh embodiments, a method for setting frequency resources will be described.

[0269] (Embodiment 4) In V2X, for example, a transmitting terminal (e.g., Tx UE) notifies a receiving terminal (Rx UE) of reserved resources by an SCI. In LTE, for example, a frequency resource (e.g., sub-channel) is assigned by "Frequency resource location of initial transmission and retransmission."

[0270] A sub-channel is, for example, a resource including multiple resource blocks (for example, PRB: Physical Resource Block). The allocation of sub-channels may be, for example, consecutive sub-channels. Since sidelink communication is, for example, communication based on discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-Spread OFDM), which is called single carrier communication, the allocation of consecutive resources (for example, sub-channels) in the frequency domain can suppress an increase in peak-to-average power ratio (PAPR).

[0271] In LTE V2X, for example, multiple time resources (e.g., slots) can be reserved as shown in Fig. 6. In this case, in the frequency domain of the multiple reserved time resources, for example, the same frequency resource of a certain period (e.g., sub-channels #1 and #2 in Fig. 6) can be reserved.

[0272] As described above, the notification of the reserved resources is received not only by the receiving terminal, but also by other terminals different from the receiving terminal. Therefore, the reserved resources can be known not only by the receiving terminal to which the resources are allocated, but also by other terminals. The other terminals can, for example, monitor (or sense) other SCIs different from the SCI addressed to the other terminals, thereby reducing the probability of resource collisions by scheduling that avoids the resources reserved by the transmitting terminal. Therefore, if each terminal can correctly receive, for example, the first SCI, it becomes easier to avoid resource collisions in the allocation of time resources subsequent to the time resource in which the SCI was received.

[0273] In addition, in LTE V2X, for example, an SCI (or a PSCCH) which is a control signal and a PSSCH which is a data signal are assigned to the same slot.

[0274] In response to this, in NR V2X, for example, a method called "Standalone PSCCH" is being considered to avoid collision of SCIs in initial transmission. In the Standalone PSCCH, for example, a PSCCH that transmits an SCI is transmitted at the time of the initial transmission (in other words, a PSSCH is not transmitted), and a PSSCH that transmits data is transmitted after the next reserved time resource after the initial transmission.

[0275] In addition, for NR V2X, for example, a method called "Single sub-channel of PSCCH+PSSCH" is also under consideration. In the Single sub-channel of PSCCH+PSSCH, for example, in the initial transmission, the PSCCH that transmits the SCI and the PSSCH of one sub-channel are transmitted.

[0276] FIG. 18(a) shows an example of a Standalone PSCCH, and FIG. 18(b) shows an example of a Single sub-channel of PSCCH+PSSCH.

[0277] In FIG. 18(a), for example, in slot#0 where resource reservation starts, PSCCH is transmitted, but PSSCH is not transmitted. In the example shown in FIG. 18(a), each of two transmitting terminals transmits PSCCH in sub-channel#0 and sub-channel#2 of slot#0. For example, sub-channel#0,#1, and #2 of slot#2 are reserved by PSCCH transmitted in sub-channel#0 of slot#0, and sub-channel#1 and #2 of slot#3 are reserved by PSCCH transmitted in sub-channel#2 of slot#0. According to the Standalone PSCCH, for example, other terminals that receive (or monitor) the PSCCH in slot#0 can recognize that sub-channel#0,#1,#2 of slot#2 and sub-channel#1,#2 of slot#3 are reserved resources.

[0278] In Fig. 18(b), for example, similar to Fig. 18(a), in slot #0 where resource reservation starts, PSCCH is transmitted, and resources of the subsequent slot (for example, Slot #2 or Slot #3) are reserved. Also, in Fig. 18(b), in slot #0, PSSCH is also transmitted in 1 sub-channel together with PSCCH transmission.

[0279] By applying the Standalone PSCCH or the Single sub-channel of PSCCH+PSSCH, the initial PSCCH is transmitted, for example, in one sub-channel, so that each terminal is more likely to receive the PSCCH without collision. For example, even if the frequency resources of the PSSCH overlap, if the frequency resources of the PSCCH do not overlap, each terminal can receive the PSCCH without collision, and other terminals can know the resources reserved by the transmitting terminal.

[0280] Furthermore, in the single sub-channel of PSCCH+PSSCH, the PSSCH is also transmitted in slot #0, so that the resource utilization efficiency can be improved compared to the standalone PSCCH.

[0281] 18, the reserved resource is, for example, a time resource of a time interval (for example, a gap) specified by "Time gap between initial transmission and retransmission". However, the reserved resource may be, for example, a time resource of an interval longer than the time interval specified by "Time gap between initial transmission and retransmission" (for example, a time resource of an interval specified by "Resource reservation").

[0282] However, there has been insufficient consideration of a method for notifying frequency resources when implementing a standalone PSCCH or a single sub-channel of PSSCH+PSSCH.

[0283] For example, when an allocation of 0 (in other words, no frequency resource is allocated) or 1 sub-channel is notified in order to notify a frequency resource based on a Standalone PSCCH or a Single sub-channel of PSSCH+PSSCH, the terminal may not be able to reserve a frequency resource to be used in a subsequent slot.

[0284] Furthermore, in V2X, for example, there is a concern that a terminal cannot receive a signal transmitted from another terminal during a period in which the terminal is transmitting a signal (also called a "half duplex issue"). Therefore, depending on the terminal's situation, there may be a terminal that cannot receive a PSCCH including an initial SCI. Therefore, for example, even if a terminal cannot receive a PSCCH for the first time or multiple times, there is room for consideration of a method for identifying reserved resources by a PSCCH that has been successfully received.

[0285] Therefore, in one embodiment of the present disclosure, a method for more flexibly setting frequency resources (e.g., sub-channels) in sidelink communication will be described.

[0286] [Communication system overview] The communication system according to this embodiment includes base station 300 and terminal 400.

[0287] Fig. 19 is a block diagram showing a configuration example of a portion of terminal 400 according to this embodiment. In terminal 400 shown in Fig. 19, a control unit (e.g., corresponding to a control circuit) determines first information indicating frequency resources to be reserved and second information indicating a method of arranging channels (e.g., PSSCH) for the frequency resources. Also, a communication unit (e.g., corresponding to a communication circuit) transmits the first information and the second information.

[0288] 19, a communication unit (e.g., a communication circuit) receives first information indicating frequency resources to be reserved and second information indicating a method of arranging channels (e.g., PSSCH) for the frequency resources. A control unit (e.g., a control circuit) determines the arrangement of channels based on the first information and the second information.

[0289] [Base station configuration] Fig. 20 is a block diagram showing a configuration example of a base station 300 according to this embodiment. In Fig. 20, the base station 300 includes a frequency resource size setting unit 301, a resource pool setting unit 302, an error correction coding unit 303, a modulation unit 304, a signal allocation unit 305, a transmission unit 306, a reception unit 307, a signal separation unit 308, a demodulation unit 309, and an error correction decoding unit 310.

[0290] The frequency resource size setting unit 301 determines candidates for frequency resource sizes when transmitting a signal using, for example, some of the frequency resources allocated to the terminal 400. For example, the frequency resource size setting unit 301 may determine frequency resource size candidates for each resource pool allocated to the terminal 400. The frequency resource size setting unit 301 outputs, to the error correction coding unit 303, signaling of an upper layer including frequency resource size setting information indicating the determined size candidates.

[0291] The frequency resource size may be, for example, the number of sub-channels, or may be information indicating the ratio of the frequency resource allocated to terminal 400 to the entire frequency resource (an example will be described later).

[0292] The resource pool setting unit 302 sets a resource pool to be used for the side link for each terminal 400. For example, the resource pool setting unit 302 may generate information on time resources and frequency resources of the resource pool (hereinafter referred to as resource pool setting information). The resource pool setting unit 302 outputs higher layer signaling including the resource pool setting information to the error correction coding unit 303. In addition, the resource pool setting unit 302 outputs the resource pool setting information to the signal allocation unit 305 and the signal separation unit 308.

[0293] The error correction coding unit 303 receives the transmission data signal (DL data signal) and higher layer signaling input from the frequency resource size setting unit 301 and the resource pool setting unit 302, performs error correction coding on the input signal, and outputs the coded signal to the modulation unit 304.

[0294] The modulation section 304 performs modulation processing on the signal input from the error correction coding section 303 and outputs the modulated data signal to the signal allocation section 305 .

[0295] The signal allocating unit 305 allocates the data signal (e.g., DL data signal or higher layer signaling) input from the modulating unit 304 to resources available in a link (e.g., Uu link) between the base station 300 and the terminal 400. The formed transmission signal is output to the transmitting unit 306.

[0296] For example, the signal allocating unit 305 identifies (in other words, recognizes) slots and sub-channels available for sidelink communication based on information input from the resource pool setting unit 302. Then, for example, when the terminal 400 cannot simultaneously transmit and receive data in a link used for DL ​​data (e.g., a Uu link) and the sidelink, the signal allocating unit 305 may allocate a data signal to resources not used for the sidelink.

[0297] The resource pool settings may be different for each terminal 400. In this case, the slots available for use in the Uu link are different for each terminal 400.

[0298] The transmitting section 306 performs radio transmission processing such as up-conversion on the signal input from the signal allocating section 305, and transmits the signal to the terminal 400 via the antenna.

[0299] The receiving section 307 receives the signal transmitted from the terminal 400 via an antenna, performs radio reception processing such as down-conversion on the signal, and outputs the signal to the signal separating section 308 .

[0300] The signal separator 308 identifies, for example, slots available in the Uu link and slots and sub-channels available for sidelink communication, based on, for example, information input from the resource pool setting unit 302. Then, the signal separator 308 separates the signals assigned to the resources available in the Uu link, which are input from the receiving unit 307. The signal separator 308 outputs the separated signals (for example, UL data signals) to the demodulator 309.

[0301] The demodulation unit 309 performs demodulation processing on the signal input from the signal separation unit 308 , and outputs the obtained signal to the error correction decoding unit 310 .

[0302] Error correction decoding section 310 decodes the signal input from demodulation section 309 and obtains a received data signal from terminal 400 (UL data signal).

[0303] In the example shown in FIG. 20, the base station 300 includes the frequency resource size setting unit 301 and the resource pool setting unit 302, and generates higher layer signaling including frequency resource size setting information and resource pool setting information. However, the present invention is not limited to this. For example, at least one of the frequency resource size setting information and the resource pool setting information may be set in an application layer called Pre-configured, or may be set in advance in a subscriber identity module (SIM). In this case, the base station 300 may use the information set in advance without generating the frequency resource size setting information or the resource pool setting information. For example, the base station 300 may recognize slots available between the base station 300 and the terminal 400 based on the resource pool setting information set in advance, and output information indicating slots available between the base station 300 and the terminal 400 to the signal allocation unit 305 and the signal separation unit 308.

[0304] Also, here, a case will be described in which the setting related to the frequency resource in the sidelink communication (e.g., information related to the frequency resource size) is set (or notified) from the base station 300 to the terminal 400 by, for example, higher layer signaling (e.g., RRC) or MAC, but is not limited thereto. For example, when the setting related to the frequency resource in the sidelink communication is specified in a specification (or standard) or set in the SIM or application layer, the terminal 400 can operate even without the setting from the base station 300.

[0305] Also, for example, when the mode of sidelink communication is "Mode 1", it is assumed that information included in the SCI transmitted by the terminal in the sidelink is generated by base station 300. Thus, in the case of Mode 1, base station 300 may generate SCI based on, for example, frequency resource size setting information and resource pool setting information (processing similar to that of SCI generating unit 410 of terminal 400 described later), and transmit the SCI to terminal 400. Note that the SCI may be included, for example, in higher layer signaling or in a physical layer signal (for example, PDCCH).

[0306] [Device configuration] Fig. 21 is a block diagram showing an example of the configuration of terminal 400 according to this embodiment. In Fig. 21, terminal 400 has a receiving unit 401, a signal separating unit 402, an SCI receiving unit 403, a Uu demodulating unit 404, a Uu error correction decoding unit 405, an SL demodulating unit 406, an SL error correction decoding unit 407, a frequency resource size setting unit 408, a resource pool setting unit 409, an SCI generating unit 410, a Uu error correction encoding unit 411, a Uu modulating unit 412, an SL error correction encoding unit 413, an SL modulating unit 414, a signal allocating unit 415, and a transmitting unit 416.

[0307] 19 may include, for example, an SCI receiving unit 403, a frequency resource size setting unit 408, a resource pool setting unit 409, and an SCI generating unit 410. In addition, the communication circuit shown in FIG. 19 may include, for example, a receiving unit 401 and a transmitting unit 416.

[0308] The receiving unit 401 receives a reception signal via an antenna, performs reception processing such as down-conversion, and outputs the received signal to the signal separating unit 402 .

[0309] Based on the resource pool setting information input from the resource pool setting unit 409, the signal separation unit 402 separates the signal components corresponding to the link (e.g., Uu link) between the base station 300 and the terminal 400 from the signal input from the receiving unit 401, and outputs the signal components to the Uu demodulation unit 404.

[0310] Furthermore, the signal separating unit 402 separates side link signal components from the signals input from the receiving unit 401 based on the resource pool setting information. Then, the signal separating unit 402 outputs, for example, a PSCCH signal from the side link signal components to the SCI receiving unit 403. Furthermore, the signal separating unit 402 separates a PSSCH signal addressed to the terminal 400 from the side link signal components input from the receiving unit 401 based on the PSSCH resource allocation information input from the SCI receiving unit 403, and outputs the PSSCH signal to the SL demodulating unit 406.

[0311] The SCI receiving unit 403 demodulates and decodes the SCI input from the signal separating unit 402. For example, the SCI receiving unit 403 attempts demodulation and decoding of the SCI, and when the decoding is successful (in other words, when the SCI is detected), the SCI receiving unit 403 specifies candidates for the frequency resource size in which the PSSCH is arranged among the frequency resources reserved for the terminal 400, based on resource allocation information of the PSSCH addressed to the terminal 400 included in the SCI and frequency resource size setting information input from the frequency resource size setting unit 408. Then, the frequency resource size setting unit 301 determines the frequency resource in which the PSSCH is arranged (for example, the entire reserved frequency resource, a part of the reserved frequency resource, or unused) based on, for example, the bits included in the SCI and the frequency resource size candidates, and outputs PSSCH resource allocation information indicating the frequency resource and time resource to which the PSSCH is allocated to the signal separating unit 402. The SCI receiving unit 403 may determine whether or not the information included in the SCI is addressed to the terminal 400, for example, based on destination information included in the SCI.

[0312] The Uu demodulation unit 404 performs demodulation processing on the signal input from the signal separation unit 402 , and outputs the obtained demodulated signal to the Uu error correction decoding unit 405 .

[0313] The Uu error correction decoding unit 405 decodes the demodulated signal input from the Uu demodulation unit 404, outputs the obtained upper layer signaling to the frequency resource size setting unit 408 and the resource pool setting unit 409, and outputs the obtained received data signal (or referred to as the Uu received data signal).

[0314] The SL demodulation unit 406 performs demodulation processing on the signal input from the signal separation unit 402 , and outputs the obtained demodulated signal to the SL error correction decoding unit 407 .

[0315] The SL error correction decoding unit 407 decodes the demodulated signal input from the SL demodulation unit 406 and performs error detection, such as a cyclic redundancy check (CRC), on the decoded signal. If there is no error in the decoded signal, the SL error correction decoding unit 407 outputs the obtained received data signal (or referred to as a side link received data signal).

[0316] The frequency resource size setting unit 408 sets candidates for frequency resource sizes to which the PSCCH addressed to the terminal 400 is allocated, based on, for example, frequency resource size setting information included in higher layer signaling input from the Uu error correction decoding unit 405. The frequency resource size setting unit 408 outputs frequency resource size setting information indicating the set frequency resource size candidates to the SCI receiving unit 403 and the SCI generating unit 410.

[0317] The resource pool setting unit 409 sets a resource pool (for example, time resources and frequency resources) to be used by the terminal 400 for the side link, based on, for example, resource pool setting information included in higher layer signaling input from the Uu error correction decoding unit 405. The set resource pool may include, for example, either or both of resources to be used by the terminal 400 for transmission and resources to be used by the terminal 400 for reception. The resource pool setting unit 409 outputs the resource pool setting information to the SCI generating unit 410, the signal separating unit 402, and the signal allocating unit 415.

[0318] The SCI generating unit 410 generates an SCI including, for example, information on a frequency resource in which the PSSCH is arranged. For example, the SCI generating unit 410 may generate the SCI based on information input from the resource pool setting unit 409 (for example, information indicating resources available for a side link), information input from the frequency resource size setting unit 408, and a resource amount of data included in a transmission buffer (not shown). In addition, the SCI generating unit 410 may generate an SCI including information indicating which size of frequency resource among frequency resource size candidates among the frequency resources reserved in the slot in which the SCI is transmitted is allocated to the PSSCH (in other words, information indicating which of the frequency resource size candidates). In addition, the SCI may include, for example, information on the determined resource, information identifying the terminal 400 of the transmission source (for example, a transmission source ID), and information identifying the terminal 400 of the transmission destination (for example, a transmission destination ID). The SCI generating unit 410 outputs the generated SCI to the signal allocating unit 415.

[0319] For example, when the sidelink communication mode is "Mode 2", terminal 400 generates an SCI in SCI generation unit 410. Also, for example, when base station 300 generates an SCI and transmits the SCI to terminal 400 when the sidelink communication mode is "Mode 1", terminal 400 may generate the SCI based on the SCI transmitted from base station 300.

[0320] The Uu error correction encoder 411 receives a transmission data signal (UL data signal) of the Uu link as input, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the Uu modulator 412 .

[0321] The Uu modulation unit 412 modulates the signal input from the Uu error correction coding unit 411 and outputs the modulated signal to the signal allocation unit 415 .

[0322] The SL error correction encoding unit 413 receives a side link transmission data signal (side link data signal) as input, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the SL modulation unit 414.

[0323] The SL modulation unit 414 modulates the signal input from the SL error correction coding unit 413 and outputs the modulated signal to the signal allocation unit 415.

[0324] The signal allocation unit 415 allocates the PSCCH signal including the SCI and the PSSCH signal including the sidelink data signal input from the SL modulation unit 414 to sidelink resources based on, for example, information input from the resource pool setting unit 409 and information input from the SCI generation unit 410. Also, the signal allocation unit 415 allocates, for example, the signal input from the Uu modulation unit 412 to Uu link resources (for example, uplink data channel (PUSCH: Physical Uplink Shared Channel)). The signal allocation unit 415 outputs the signal allocated to the resources to the transmission unit 416.

[0325] The transmitting unit 416 performs radio transmission processing such as up-conversion on the signal input from the signal allocating unit 415 and transmits the signal.

[0326] In the example shown in FIG. 21, the terminal 400 receives higher layer signaling including frequency resource size setting information and resource pool setting information, but is not limited thereto. For example, at least one of the frequency resource size setting information and the resource pool setting information may be set in an application layer called Pre-configured, or may be set in advance in a SIM. In this case, the terminal 400 may use the preset information without receiving the frequency resource size setting information or the resource pool setting information. For example, the terminal 400 may recognize resources available between the base station 300 and the terminal 400 and resources available for a side link based on the preset resource pool setting information, and may use information on these resources in the signal separation unit 402 and the signal allocation unit 415.

[0327] In addition, in FIG. 21, as an example, a case has been described in which the demodulation unit, error correction decoding unit, error correction coding unit, and modulation unit have different components for the Uu link and the side link, but this is not limited to the above, and the Uu link and the side link may have common components.

[0328] [Operation of Terminal 400] Next, an example of the operation of the terminal 400 (see FIG. 21) will be described.

[0329] FIG. 22 is a flowchart showing an example of processing by the terminal 400.

[0330] A terminal 200 (e.g., a transmitting terminal and a receiving terminal) that transmits and receives in the sidelink configures parameters related to the sidelink (S201). The parameters related to the sidelink may include, for example, a time resource, a frequency resource (e.g., a sub-channel), a SL BWP, a resource pool, and a channel configuration to be allocated to each slot.

[0331] The parameters related to the side link may be notified from the transmitting terminal to the receiving terminal by, for example, the SCI. Alternatively, the parameters related to the side link may be defined for the terminal 200 in, for example, a specification (or a standard), may be configured in an application layer called "pre-configured," may be pre-configured in the SIM, or may be configured by a SIB called "configured" or other higher layers such as RRC or MAC.

[0332] The terminal 200 performs sidelink communication (for example, data transmission / reception) based on the set parameters (S202).

[0333] Next, an example of a method for setting frequency resources (for example, sub-channels) will be described.

[0334] In this embodiment, for example, the transmitting terminal transmits to the receiving terminal an SCI including information indicating a method of arranging the PSSCH in the frequency resources reserved for sidelink communication. The information indicating a method of arranging the PSSCH in the reserved frequency resources may include information regarding, for example, the arrangement of the PSSCH in all the reserved frequency resources, the arrangement of the PSSCH in some of the frequency resources, or the case where the PSSCH is not assigned (in other words, the reserved frequency resources are not used).

[0335] Based on this notification, the terminals 400 (eg, transmitting terminals and receiving terminals) may determine, for example, the frequency resources in which the PSSCH is located in each reserved time resource (eg, slot).

[0336] Here, the information notifying the reserved frequency resource is different from the information indicating the arrangement method of the PSSCH among the reserved frequency resources. Therefore, for example, in a certain slot, when the PSSCH is allocated to some of the reserved frequency resources, or even when the PSSCH is not allocated, the terminal 400 can identify the reserved frequency resource in another slot following the slot.

[0337] Therefore, according to the present embodiment, even when, for example, a Standalone PSCCH or a Single sub-channel of PSCCH+PSSCH is applied, terminal 400 can dynamically set the allocation in the reserved frequency resources and can reduce the probability that the PSCCH in which the SCI is transmitted will collide with the PSSCH of another UE.

[0338] In addition, the frequency resource size candidates may be specified in a specification (or a standard), may be pre-configured in the SIM, may be configured in an application layer called "pre-configured," or may be configured in an SIB or other higher layers such as RRC or MAC called "configured."

[0339] Also, one or more frequency resource size candidates may be set. Also, the frequency resource size candidate may be selected (in other words, notified) from among all frequency resource size candidates by the SCI. Also, the frequency resource size candidate may be notified of options from among a plurality of predetermined candidates to the terminal 400, and the terminal 400 may select from the options by the SCI. Also, the frequency resource size options may be notified, for example, in a higher layer such as RRC or in the MAC.

[0340] An example of the operation of the terminal 400 will now be described.

[0341] [Operation example 4-1 (Standalone PSCCH)] In operation example 4-1, an example in which a Standalone PSCCH is applied will be described.

[0342] In the operation example 4-1, for example, 1-bit information (for example, either bit 0 or bit 1) is set (in other words, added) in the SCI.

[0343] Of the 1-bit information, bit 0 may indicate, for example, the placement (in other words, allocation or use) of the PSSCH in a frequency resource (in other words, a reserved frequency resource) allocated by "Frequency resource location of initial transmission and retransmission."

[0344] Furthermore, among the 1-bit information, bit 1 may indicate, for example, that in a slot in which an SCI including the 1-bit information is transmitted or received, a PSSCH is not placed in the frequency resource allocated by the "Frequency resource location of initial transmission and retransmission" (in other words, unallocated or unused).

[0345] For example, a transmitting terminal can set one bit of information contained in an SCI to bit 1 to notify a receiving terminal that a PSSCH is not placed in the slot in which the SCI is received (e.g., slot #0 in Figure 18(a)).

[0346] In addition, the transmitting terminal can reserve, for the receiving terminal, a frequency resource for a PSSCH in a slot (e.g., slot #2 or #3 in FIG. 18(a)) following the slot in which the SCI is received (e.g., slot #0 in FIG. 18(a)) by using resource allocation information (e.g., "Frequency resource location of initial transmission and retransmission") that is different from the above-mentioned 1-bit information included in the SCI.

[0347] [Operation example 4-2 (Single sub-channel of PSCCH+PSSCH)] In operation example 4-2, an example in which a single sub-channel of PSSCH+PSSCH is applied will be described.

[0348] In the operation example 4-2, for example, 1-bit information (for example, either bit 0 or bit 1) is set (in other words, added) in the SCI.

[0349] Of the 1-bit information, bit 0 may indicate, for example, the placement (in other words, allocation or use) of the PSSCH in a frequency resource (in other words, a reserved frequency resource) allocated by "Frequency resource location of initial transmission and retransmission."

[0350] Furthermore, among the 1-bit information, bit 1 may indicate, for example, the placement of the PSSCH in a portion of the frequency resources (e.g., 1 sub-channel) among the frequency resources allocated by the "Frequency resource location of initial transmission and retransmission" in a slot in which an SCI including the 1-bit information is transmitted and received.

[0351] For example, a transmitting terminal can set one bit of information contained in an SCI to bit 1 to notify a receiving terminal that a PSSCH is placed in 1-sub-channel in the slot in which the SCI is received (e.g., slot #0 in FIG. 18(b)).

[0352] In addition, the transmitting terminal can reserve, for the receiving terminal, a frequency resource for a PSSCH in a slot (e.g., slot #2 or #3 in FIG. 18(b)) following the slot in which the SCI is received (e.g., slot #0 in FIG. 18(b)) by using resource allocation information (e.g., "Frequency resource location of initial transmission and retransmission") that is different from the above-mentioned 1-bit information included in the SCI.

[0353] In the operation example 4-2, 1-sub channel is described as an example of a part of frequency resources notified by 1-bit information, but is not limited thereto. For example, the part of frequency resources notified by 1-bit information may be a plurality of sub-channels or a plurality of PRBs among the frequency resources allocated by "Frequency resource location of initial transmission and retransmission".

[0354] Also, the operation example 4-2 may be applied not only to the initial transmission of TB but also to the retransmission of TB. FIG. 23 shows an example in which the operation example 4-2 is applied to the retransmission of TB. For example, in FIG. 23, in Slot#0, bit 0 is notified, and the frequency resource of the initial transmission of TB#1 is set to a part of the frequency resources (for example, 1 sub-channel). Also, for example, in FIG. 23, in Slot#2, bit 1 is notified, and the frequency resource of the retransmission of TB#1 is set to the frequency resource reserved by the terminal 400 (for example, 3 sub-channels). Also, for example, in FIG. 23, in Slot#20, bit 1 is notified, and the frequency resource of the initial transmission of TB#2 is set to the frequency resource reserved by the terminal 400 (for example, 3 sub-channels). Also, for example, in FIG. 23, in Slot#22, bit 0 is notified, and the frequency resource of the retransmission of TB#2 is limited to a part of the frequency resources (for example, 1 sub-channel).

[0355] 23, terminal 200 can allocate TB to a part of the reserved frequency resources in both the initial transmission and the retransmission. This resource allocation can reduce the amount of resources used when it is not necessary to allocate all of the reserved frequency resources in the retransmission, for example, and therefore can reduce interference and the probability of collision with resources used by other UEs.

[0356] [Example 4-3] In operation example 4-3, a setting example of a plurality of frequency resource sizes will be described.

[0357] For example, a bit (e.g., a bit included in the SCI) is set (in other words, added) to indicate the placement of the PSSCH in some or all of the frequency resources (e.g., sub-channels) allocated by the "Frequency resource location of initial transmission and retransmission".

[0358] For example, a case where 2-bit information is set will be described.

[0359] The 2-bit information may indicate, for example, the ratio of resources in which the PSSCH is arranged to the entire frequency resources allocated by "Frequency resource location of initial transmission and retransmission" (in other words, the frequency resource size) as follows: Bit 00: All resources Bit 01:1 / 2 Resources Bit 10: 1 / 4 Resources Bit 11: 1 sub-channel

[0360] For example, in the case of bit 01 or bit 10, i.e., 1 / 2 or 1 / 4 resources, terminal 400 may divide the number of sub-channels allocated by "Frequency resource location of initial transmission and retransmission" into 2 or 4 to determine the number of sub-channels in which to place PSSCH. In this case, if the result of division is not an integer, terminal 400 may calculate the number of sub-channels by rounding down the decimal point as in Floor (number of sub-channels), or may calculate the number of sub-channels by rounding up the decimal point as in Ceil (number of sub-channels).

[0361] Also, for example, in the case of bit 01, i.e., 1 / 2 resources, terminal 400 may divide the number of sub-channels allocated by "Frequency resource location of initial transmission and retransmission" into two and generate two sub-channel groups. Similarly, for example, in the case of bit 10, i.e., 1 / 4 resources, terminal 400 may divide the number of sub-channels allocated by "Frequency resource location of initial transmission and retransmission" into four and generate four sub-channel groups. Then, terminal 400 may select one of the sub-channel groups.

[0362] The frequency resource size candidates (for example, all resources, 1 / 2 resources, 1 / 4 resources, or 1 sub-channel) are just examples, and other values ​​may be used. The frequency resource size candidates may also include a case where PSSCH is not allocated (PSSCH is not used) as in operation example 4-1.

[0363] Furthermore, the number of bits of the information indicating the frequency resource size is not limited to 2 bits, and may be other numbers of bits. For example, the number of bits of the SCI may be increased as the number of types of frequency resource sizes increases.

[0364] In this way, even if the PSSCH is placed in some sub-channels of the reserved frequency resources in a certain slot (e.g., the first slot) among the reserved time resources (e.g., slots), the terminal 400 can reserve a frequency resource for the PSSCH in a slot (e.g., a subsequent slot) different from the slot in which the SCI is received.

[0365] Operational example 4-1 to operation example 4-3 have been described above.

[0366] According to this embodiment, terminal 200 determines the sub-channel in which the PSSCH is placed in each of the reserved slots, for example, based on notification information regarding the use of the reserved sub-channels (e.g., all use, some use, or unused).

[0367] By determining the sub-channel, for example, even when a standalone PSCCH or a single sub-channel of PSSCH+PSSCH is applied, terminal 400 can allocate a PSSCH based on a different frequency resource size in each of a plurality of reserved slots.

[0368] Therefore, according to the present embodiment, even in a case where there are more diverse traffic types than in LTE, such as in NR, the frequency resource size can be dynamically set, thereby improving the efficiency of resource allocation (e.g., frequency resource allocation or reservation) in wireless communication (e.g., sidelink communication).

[0369] [How to select sub-channel] An example of a method for selecting sub-channels to be set in some frequency resources in which the PSSCH is allocated, among the reserved frequency resources, will be described.

[0370] For example, in the operation example 4-2 and the operation example 4-3, the sub-channel selected may be a sub-channel including an SCI. In V2X, for example, including a PSCCH region in a PSSCH region is being considered. In this case, if the sub-channel for transmitting the PSCCH and the sub-channel for transmitting the PSSCH are the same, the number of sub-channels occupied by the PSSCH and the PSCCH can be reduced. For example, if the PSSCH is placed in one sub-channel, the selected sub-channel may be set to one sub-channel including the PSCCH. In addition, when multiple sub-channels are selectable as in the operation example 4-3, for example, a sub-channel group including the PSCCH may be selected from among sub-channel groups obtained by dividing the "Frequency resource location of initial transmission and retransmission".

[0371] Also, for example, in Operation Example 4-2 and Operation Example 4-3, the sub-channels selected may include the sub-channel with the lowest or highest sub-channel number among the frequency resources allocated by the "Frequency resource location of initial transmission and retransmission". For example, when multiple sub-channels are selectable as in Operation Example 4-3, the sub-channel group including the sub-channel with the lowest or highest sub-channel number may be selected among the sub-channel groups divided by the "Frequency resource location of initial transmission and retransmission".

[0372] In addition, in the operation example 4-2 and the operation example 4-3, the sub-channels to be selected may include sub-channels determined based on a value identifying a UE, such as a UE ID, an RNTI, a Layer-1 source ID, or a Layer-1 destination ID, among the frequency resources allocated by the "Frequency resource location of initial transmission and retransmission". For example, the terminal 400 may select a sub-channel having a number obtained by adding a remainder obtained by dividing a value identifying a UE by the number of sub-channels allocated to the terminal 400 to the lowest sub-channel number among the sub-channels allocated to the terminal 400. In addition, for example, when a plurality of sub-channels are selectable as in the operation example 4-3, the terminal 400 may select a sub-channel group having a number obtained by adding a remainder obtained by dividing a value identifying a UE by the number of sub-channel groups into which the "Frequency resource location of initial transmission and retransmission" is divided, to the lowest sub-channel group number.

[0373] [TB size (Transport block size)] Also, for example, as in operation example 4-2 and operation example 4-3, when the PSSCH is arranged in some sub-channels, the amount of resources in which the PSSCH is arranged is smaller than the amount of resources in which the PSSCH is arranged in all of the reserved sub-channels. In addition, in NR, the TB size is calculated based on, for example, the amount of time domain and frequency domain resources to be allocated and the MCS notified by a control signal (for example, DCI).

[0374] Therefore, for example, when a TB allocated to a portion of the frequency resources allocated to terminal 400 is transmitted for the first time and a TBS is calculated based on the amount of resources at the time of the first transmission, the number of systematic bits that can be transmitted at the time of retransmission may decrease even if the amount of resources for retransmission is larger than the amount of resources at the time of the first transmission. In this case, the quality of the PSSCH allocated to the resources for retransmission becomes excessive, and the efficiency of resource use decreases.

[0375] Therefore, in this embodiment, for example, as in operation example 4-2 and operation example 4-3, when the allocation method notified by the SCI is the allocation of the PSSCH to some sub-channels, the TBS may be calculated based on the size of the entire sub-channel specified by the "Frequency resource location of initial transmission and retransmission". In other words, the TBS may be calculated based on the size of the entire frequency resource to be reserved, regardless of the frequency resource (e.g., sub-channel) in which the PSSCH is allocated.

[0376] This determination of TBS can prevent the quality of the PSSCH allocated to the retransmission resource from becoming excessive. Also, for example, the transmitting terminal can determine the number of systematic bits to be transmitted and set the MCS in consideration of the amount of retransmission resources at the time of the first transmission.

[0377] (Embodiment 5) In the fourth embodiment, a method for explicitly notifying the frequency resource size in which the PSSCH is allocated by using a bit included in the SCI has been described. In contrast, in the present embodiment, a method for implicitly notifying the frequency resource size in which the PSSCH is allocated will be described.

[0378] According to the present embodiment, terminal 400 can report a plurality of frequency resource sizes in which the PSSCH is allocated, without increasing the number of SCI bits.

[0379] The base station and terminal according to the present embodiment have a basic configuration in common with base station 300 and terminal 400 according to the fourth embodiment.

[0380] An example of a method for setting frequency resources (for example, sub-channels) according to this embodiment will be described below.

[0381] [Example 5-1] In the operation example 5-1, the "priority indication" or "QoS indication" included in the SCI is used to notify the frequency resource size (in other words, the arrangement method of the PSSCH). Note that, although it is called a priority indication in LTE, it may be called a different name (e.g., "QoS indication") in the SCI of NR.

[0382] It is considered that the priority indication or the QoS indication includes information such as priority, latency, or reliability. Based on the priority indication or the QoS indication, control such as resource allocation, congestion control between terminals, a transmission method when multiple data are generated in a terminal (resolution of in-device coexistence issues), or transmission power control is considered.

[0383] In the operation example 5-1, the terminal 400 may determine the frequency resource size of the PSSCH based on, for example, the Priority indication or the QoS indication. In other words, the information included in the Priority indication or the QoS indication is associated with the frequency resource size (in other words, the arrangement method of the PSSCH).

[0384] For example, the terminal 400 specifies the delay amount required for the terminal 400 (in other words, the desired delay amount) or the required reliability based on the Priority indication or the QoS indication.

[0385] Then, when the identified delay amount is short or the reliability is high (for example, when it is less than a threshold), terminal 400 may, for example, allocate PSSCH to all reserved frequency resources. Also, when the identified delay amount is long or the reliability is low (for example, when it is equal to or greater than a threshold), terminal 400 may not allocate reserved frequency resources to PSSCH, or may allocate reserved frequency resources to some of the frequency resources. Note that some of the frequency resources may be set based on, for example, any of Operation Example 4-1 to Operation Example 4-3.

[0386] In addition, the frequency resource size in which the PSSCH is arranged when the delay amount is short or the reliability is high is not limited to all reserved frequency resources, and may be set to a size larger than the frequency resource size in which the PSSCH is arranged when the delay amount is long or the reliability is low, for example.

[0387] For example, by arranging the PSSCH in all reserved frequency resources, the reception quality of the PSSCH can be improved compared to when the PSSCH is arranged in a portion of the reserved frequency resources, making it easier to satisfy the delay amount or reliability required for terminal 400.

[0388] The mapping between the priority indication or QoS indication and the frequency resource size may be specified in a specification (or standard), may be configured in the SIM, may be configured in an application layer called pre-configured, or may be configured in a SIB or other higher layers such as RRC or MAC called configured.

[0389] Furthermore, terminal 400 may determine whether a TB included in a received PSSCH is a TB of an initial transmission or a TB of a retransmission, for example, based on a retransmission index included in the SCI.

[0390] According to the operation example 5-1, the terminal 400 can notify the frequency resource size without using a new bit. Also, for example, the terminal 400 can arrange the PSSCH in the frequency resource based on the frequency resource size suitable for a parameter (for example, a required delay amount or reliability) corresponding to a value set in LTE.

[0391] [Example 5-2] In the operation example 5-2, the redundancy version (RV) included in the SCI is used to notify the frequency resource size (PSSCH arrangement method).

[0392] As described in the second embodiment (operation example 2-2), in NR, retransmission control by notification of RV and New Data Indicator (NDI) is being considered for SCI as well as for downlink control information (DCI).

[0393] As described in the second embodiment, for example, in the circular buffer shown in Fig. 15, the more bits that can be transmitted in one transmission, the more likely it is that a bit string corresponding to RV3 or RV1 will be included in a bit string corresponding to RV0 or RV2. In other words, for example, in Fig. 15, terminal 400 (e.g., a receiving terminal) can receive bits included in a bit string corresponding to RV3 or RV1 by receiving a bit string corresponding to RV0 or RV2.

[0394] Therefore, even if some (e.g., one) of the multiple RVs are not allocated with PSSCH as in operation example 4-1 (in other words, reserved frequency resources are not used), or are used to notify the allocation of PSSCH to some of the reserved frequency resources as in operation example 4-2, it is expected that the reception characteristics in terminal 400 are unlikely to deteriorate.

[0395] Therefore, in operation example 5-2, terminal 400 may determine the frequency resource size of the PSSCH based on, for example, the RV. In other words, the RV and the frequency resource size (in other words, the arrangement method of the PSSCH) are associated with each other.

[0396] As an example 1 of the operation example 5-2, the terminal 400 may notify the frequency resource size using the bit used for notifying RV3 as follows. Note that, in the following, as an example, RV0 is notified by bit 00, RV1 is notified by bit 01, RV2 is notified by bit 10, and RV3 is notified by bit 11.

[0397] In Example 1, bit 11 may indicate allocation of PSSCH to a portion of the reserved frequency resources, or no allocation of PSSCH (unuse of the reserved frequency resources), and RV0, instead of RV3. 00: RV0 and PSSCH is placed in all reserved frequency resources 01: RV1 and PSSCH are placed in all reserved frequency resources 10: RV2 and PSSCH are placed in all reserved frequency resources 11: RV0 and PSSCH is allocated to a part of the reserved frequency resources or PSSCH is not allocated

[0398] For example, bit 11 may be associated with a smaller frequency resource size compared to bits 00, 01, and 10. In other words, for example, bits 00, 01, and 10 may be associated with a larger frequency resource size (e.g., all or a portion of the reserved frequency resources) compared to bit 11.

[0399] For example, when PSSCH is arranged in all reserved frequency resources, any of RV0, RV1, and RV2 can be set, whereas when PSSCH is arranged in a part of reserved frequency resources, RV0 can be set. However, when PSSCH is arranged in a part of reserved frequency resources, it is assumed that this is the first transmission of TB. Therefore, even if the RV that can be set when PSSCH is arranged in a part of reserved frequency resources is one of the RVs that is likely to be used at the time of the first transmission, the retransmission efficiency is unlikely to deteriorate.

[0400] In example 1, a case has been described in which bit 11 corresponding to RV3 is used to notify a frequency resource size different from the bits corresponding to other RVs. However, a bit corresponding to another RV other than RV3 (e.g., RV1) may be used to notify an interval different from the bits corresponding to other RVs.

[0401] Also, as Example 2 of Operation Example 5-2, two of the multiple RVs (for example, RV1 and RV3) may be used to notify the allocation of PSSCH to a part of the reserved frequency resources as in Operation Example 4-2. In the case of Example 2, RV1 and RV3 are not set, and RV0 or RV2 may be set instead, as follows. 00: RV0 and PSSCH is placed in all reserved frequency resources 01: RV0 and PSSCH is placed in a part of the reserved frequency resources 10: RV2 and PSSCH are placed in all reserved frequency resources 11: RV2 and PSSCH are placed in part of the reserved frequency resources

[0402] In this way, when the allocation of PSSCH to a portion of the reserved frequency resources is notified instead of notifying two RV states (e.g., RV1 and RV3), terminal 400 can support the operation of allocating PSSCH to a portion of the reserved frequency resources not only at the time of initial transmission (e.g., in the case of RV0) but also at the time of retransmission (e.g., in the case of RV2).

[0403] In addition, for example, when it is not necessary to allocate all of the reserved frequency resources in a retransmission, terminal 400 can reduce the amount of resources used by selecting to allocate the PSSCH to a portion of the reserved frequency resources, thereby reducing interference and the probability of collision with resources transmitted by other UEs.

[0404] In addition, in the operation example 5-2, instead of (or in addition to) notifying the allocation of PSSCH in a part of the reserved frequency resources by the RV, no allocation of PSSCH may be notified.

[0405] [Example of operation 5-3] In the operation example 5-3, the "RV" and "Retransmission index" included in the SCI are used to notify the frequency resource size (in other words, the arrangement method of the PSSCH).

[0406] The retransmission index is information that indicates whether it is an initial transmission or a retransmission.

[0407] In operation example 5-3, terminal 400 may determine the frequency resource size of the PSSCH based on, for example, the RV and the retransmission index (for example, information instructing the retransmission of data). In other words, a combination of the RV and the retransmission index (transmission type) is associated with the frequency resource size (in other words, the arrangement method of the PSSCH).

[0408] For example, by restricting the types of RVs that can be used depending on the initial transmission and retransmission, placement of the PSSCH on a portion of the reserved frequency resources is instead signaled.

[0409] For example, in a three-bit bit string consisting of a two-bit RV and a one-bit retransmission index, the first two bits are used for the RV, and the last bit is used for the retransmission index. For example, the retransmission index (for example, the third bit of the three bits) indicates initial transmission when it is 0, and indicates retransmission when it is 1. For example, the RV is set to either RV0 or RV3 at the time of initial transmission, and is set to either RV2 or RV1 at the time of retransmission.

[0410] In this case, the RV, interval, and transmission type (initial transmission or retransmission) may be set for a 3-bit bit string (for example, 000 to 111) as follows. 000: RV0, PSSCH is allocated to all reserved frequency resources and first transmission 001: RV2, PSSCH is placed in all reserved frequency resources and retransmitted 010: RV0, PSSCH is placed in a part of the reserved frequency resources and first transmission 011: RV2, PSSCH is placed in part of the reserved frequency resources and retransmission 100: RV3, PSSCH is allocated to all reserved frequency resources and first transmission 101: RV1, allocate PSSCH to all reserved frequency resources and retransmit 110: RV3, PSSCH is placed in a part of reserved frequency resources and first transmission 111: RV1, PSSCH is placed in part of the reserved frequency resources and retransmission

[0411] For example, at the time of initial transmission, RV0 or RV3 is selected, which is likely to include more systematic bits than RV1 and RV2, and at the time of retransmission, RV1 or RV2 is selected, which is likely to include more parity bits that were not included in the initial transmission.

[0412] According to operation example 5-3, the number of selectable RVs for each of the initial transmission and retransmission is reduced, but since RVs suitable for each of the initial transmission and retransmission are included in the options, degradation of reception quality at terminal 400 can be suppressed.

[0413] In the operation example 5-3, instead of (or in addition to) notifying the allocation of PSSCH in a part of the reserved frequency resources by the RV and the retransmission index, no allocation of PSSCH may be notified.

[0414] [Example of operation 5-4] In the operation example 5-4, the HARQ process number (or the HARQ process ID) included in the SCI is used to notify the frequency resource size (in other words, the PSSCH arrangement method).

[0415] In NR, support for multiple processes is being considered, and the HARQ process ID can be signaled by the SCI.

[0416] In the operation example 5-4, the terminal 400 may determine the frequency resource size of the PSSCH based on, for example, the HARQ process ID. In other words, the HARQ process ID and the frequency resource size (in other words, the arrangement method of the PSSCH) are associated with each other.

[0417] For example, for each HARQ process, allocation of the PSSCH to all reserved frequency resources or allocation of the PSSCH to a portion of the reserved frequency resources may be configured.

[0418] In addition, the configuration method for each HARQ process may be, for example, specified in a specification (or standard), may be pre-configured in the SIM, may be configured in an application layer called pre-configured, or may be configured in a higher layer such as an SIB or other RRC or MAC called configured.

[0419] Operational examples 5-1 to 5-4 have been described above.

[0420] In addition, any two or more of the operation examples 5-1 and 5-4 may be combined.

[0421] In this embodiment, the frequency resource size of the PSSCH is implicitly notified by information defined for other purposes. Therefore, according to this embodiment, for example, in order to notify the frequency resource size of the PSSCH in the side link, for example, new information does not need to be added to the parameters defined in LTE, so that the signaling overhead can be reduced.

[0422] (Embodiment 6) In NR V2X, for example, it is being considered that SCI will be transmitted in two stages.

[0423] For example, the SCI of the first stage (eg, also referred to as 1st SCI) is arranged in the PSCCH, and the SCI of the second stage (eg, also referred to as 2nd SCI) is arranged in a part of the PSSCH region.

[0424] The SCI of the first stage may be received by, for example, the receiving terminal (in other words, the terminal to which the SCI is sent) as well as other terminals. The other terminals may perform sensing to grasp the reservation status of resources based on the SCI of the first stage, for example.

[0425] On the other hand, for the SCI of the second stage, for example, the resource amount or resource area is notified by the SCI of the first stage. Also, it is being considered that the SCI of the second stage is received by the receiving terminal and not received by other terminals.

[0426] Therefore, for example, the number of bits of the first stage SCI can be further reduced by including in the first stage SCI information that can be used for sensing in a terminal other than the SCI destination terminal, and not including information that is not used for sensing. By setting the first stage SCI in this way, for example, the coding rate of the first stage SCI can be lowered (in other words, redundantly) and it can be easily received by other terminals.

[0427] Also, for example, the SCI in the second stage only needs to be received by the receiving terminal, which is the destination terminal of the SCI, and therefore may be transmitted at, for example, a coding rate that can be received by the receiving terminal.

[0428] In this embodiment, a method of notifying frequency resources using a two-stage SCI will be described.

[0429] The base station and terminal according to the present embodiment have a basic configuration in common with base station 300 and terminal 400 according to the fourth embodiment.

[0430] An example of the operation of terminal 400 according to this embodiment will now be described.

[0431] [Example 6-1] In operation example 6-1, for example, terminal 400 transmits a first-stage SCI including information related to frequency resources in the fourth embodiment to a receiving terminal.

[0432] According to the operation example 6-1, for example, a terminal other than the receiving terminal can also receive the SCI of the first stage. The terminal other than the receiving terminal can recognize, for example, the frequency resource in which the PSSCH is allocated.

[0433] For example, other terminals may use information on the frequency resource in which the PSSCH is arranged for interference measurement. For example, in the operation example 4-1 of the fourth embodiment, the PSSCH is not arranged in the frequency resource, so that the operation example 6-1 is valid.

[0434] Furthermore, since terminal 400 can identify the frequency resource in which the PSSCH is placed in the SCI of the first stage, for example, when the PSSCH is placed in some frequency resources in operation example 4-2 or operation example 4-3 of embodiment 4, the area in which the SCI of the second stage is allocated can be changed according to the area in which the PSSCH is actually allocated.

[0435] [Example 6-2] In operation example 6-2, for example, terminal 400 transmits a second-stage SCI including information on the frequency resource in operation example 4-2 or operation example 4-3 of the fourth embodiment to the receiving terminal.

[0436] According to operation example 6-2, for example, the number of bits transmitted in the SCI of the first stage can be reduced, and the coding rate of the SCI of the first stage can be reduced, thereby improving the probability that other terminals can receive the SCI.

[0437] In addition, in operation example 6-2, the receiving terminal cannot identify the frequency resource in which the PSSCH is allocated from the SCI in the first stage. Therefore, the receiving terminal may set the region in which the SCI in the second stage is allocated to the same sub-channel as the PSCCH, assuming a case in which the PSSCH is allocated to some frequency resources in operation example 4-2 or operation example 4-3 of embodiment 4, for example.

[0438] Alternatively, in operation example 4-2 or 4-3 of the fourth embodiment, terminal 400 may set the region to which the SCI of the second stage is allocated to the frequency region with the smallest number of sub-channels.

[0439] (Embodiment 7) In the fourth embodiment, a method has been described in which, for example, a frequency resource in which a PSSCH is allocated (in other words, a frequency resource size) among frequency resources allocated by "Frequency resource location of initial transmission and retransmission" is notified by a bit included in the SCI.

[0440] In this embodiment, for example, a method will be described in which information regarding the allocation of frequency resources in each of a plurality of reserved time resources (for example, slots) is included in one SCI, making it possible to allocate different frequency resources in a plurality of slots.

[0441] According to the present embodiment, it is possible to improve the flexibility of frequency resource allocation compared to the fourth embodiment, for example.

[0442] The base station and terminal according to the present embodiment have a basic configuration in common with base station 300 and terminal 400 according to the fourth embodiment.

[0443] An example of the operation of terminal 400 according to this embodiment will now be described.

[0444] [Example 7-1] In the operation example 7-1, the SCI includes information regarding the allocation of frequency resources in multiple slots.

[0445] As an example, a case will be described in which one SCI includes information on allocation of frequency resources for four slots. In this example, the terminal 400 may notify, for example, information on allocation of frequency resources for four slots out of the reserved time resources by the SCI.

[0446] FIG. 24 shows an example of resource allocation in the operation example 7-1.

[0447] In FIG. 24, for example, the interval notified by the "resource reservation" included in the SCI is 20 ms, and the first allocated resource in the time domain is slot#0.

[0448] As shown in FIG. 24, terminal 400 may include the following information in information regarding frequency resource allocation (for example, resource indication value (RIV)) in the SCI of slot #0. Sub-channel#1 Sub-channel#0,#1,#2 Sub-channel#1,#2 Sub-channel#0,#1

[0449] The four slots of frequency resources notified in slot#0 correspond to slot#0, slot#20, slot#40, and slot#60, respectively.

[0450] The terminal 400 that receives the SCI in slot#0 can recognize the allocation of frequency resources for four slots from slot#0. In other words, the terminal 400 can reserve frequency resources for four slots from slot#0 based on one SCI. Also, as in the above example, the frequency resources for four slots can be set for each slot, for example.

[0451] Furthermore, as shown in FIG. 24, terminal 400 may include the following information in information (eg, RIV) regarding frequency resource allocation in the SCI of slot #20: Sub-channel#0,#1,#2 Sub-channel#1,#2 Sub-channel#0,#1 Sub-channel#0,#1,#2

[0452] The four slots of frequency resources notified in slot#20 correspond to slot#20, slot#40, slot#60, and slot#80, respectively.

[0453] The terminal 400 that receives the SCI in slot #20 can recognize the allocation of frequency resources for four slots starting from slot #20. In other words, the terminal 400 can reserve frequency resources for four slots starting from slot #20 based on one SCI. Also, as in the above example, the frequency resources for four slots can be set for each slot, for example.

[0454] According to the operational example 7-1, frequency resources in multiple slots can be flexibly reserved by one SCI.

[0455] The above-mentioned allocation of frequency resources (e.g., sub-channels) for four slots is an example, and other sub-channels may be allocated. Furthermore, the number of slots for which frequency resources can be notified by one SCI is not limited to four slots, and other slot numbers may be used.

[0456] [Example 7-2] In the operation example 7-2, the SCI includes information regarding the allocation of frequency resources in multiple slots.

[0457] As an example, a case will be described in which one SCI includes information on allocation of frequency resources for four slots. In this example, the terminal 400 may notify, for example, information on allocation of frequency resources for four slots out of the reserved time resources by the SCI.

[0458] FIG. 25 shows an example of resource allocation in the operation example 7-2.

[0459] In FIG. 25, for example, the interval notified by the "Resource reservation" included in the SCI is 20 ms, the time interval between the initial transmission and retransmission notified by the "Time gap between initial transmission and retransmission" is 2 slots, and the first allocated resource in the time domain is slot#0.

[0460] As shown in FIG. 25, terminal 400 may include the following information in information (eg, RIV) regarding frequency resource allocation in the SCI of slot #0: Sub-channel#1 Sub-channel#0,1,2 Sub-channel#1,2 Sub-channel#0,1

[0461] The above-mentioned four slots of frequency resources notified in slot #0 correspond to slot #0, slot #2, slot #20, and slot #22, respectively. In FIG. 25, slot #2 and slot #22 are resources for retransmission of data (for example, PSSCH) transmitted in slot #0 and slot #20.

[0462] The terminal 400 that receives the SCI in slot#0 can recognize the allocation of frequency resources for four slots from slot#0. In other words, the terminal 400 can reserve frequency resources for four slots from slot#0 based on one SCI. Also, as in the above example, the frequency resources for four slots can be set for each slot, for example.

[0463] In addition, in operation example 7-2, terminal 400 may also notify frequency resources for initial transmission in slot #2 and slot #22, which are resources for retransmission shown in Fig. 25. This is because terminal 400 calculates TBS based on the amount of frequency resources at the time of initial transmission.

[0464] For example, as shown in FIG. 25, terminal 400 may include the following information in information (eg, RIV) regarding frequency resource allocation in the SCI of slot #2: Sub-channel#1 Sub-channel#0,#1, #2 Sub-channel#1,#2 Sub-channel#0,#1

[0465] The above-mentioned four slots of frequency resources notified in slot#2 correspond to slot#0, slot#2, slot#20, and slot#22, respectively. The above-mentioned four slots of frequency resources notified in slot#2 (at the time of retransmission) are, for example, the same as the four slots of frequency resources notified in slot#0 (at the time of initial transmission).

[0466] Similarly, in slot #22, which is a resource for retransmission, the same frequency resource as the 4 slots of frequency resource notified in slot #20, which is a resource for initial transmission, may be notified. Similarly, in slot #42, which is a resource for retransmission, the same frequency resource as the 4 slots of frequency resource notified in slot #40, which is a resource for initial transmission, may be notified.

[0467] According to operation example 7-2, for example, in FIG. 25, even if the SCI of slot #0 cannot be received due to a half duplex issue or other factors, terminal 400 (receiving terminal) can calculate the TBS of the PSSCH of slot #2 from the frequency resource of slot #0 based on the SCI of slot #2, and can receive the PSSCH of slot #2.

[0468] Moreover, according to the operational example 7-2, frequency resources in multiple slots can be flexibly reserved using one SCI.

[0469] The above-mentioned allocation of frequency resources (e.g., sub-channels) for four slots is an example, and other sub-channels may be allocated. Furthermore, the number of slots for which frequency resources can be notified by one SCI is not limited to four slots, and other slot numbers may be used.

[0470] [Example 7-3] In the operation example 7-3, the SCI includes information regarding the allocation of frequency resources in a plurality of slots. In addition, in the operation example 7-3, the allocation of frequency resources included in the SCI is periodically repeated at certain time intervals (for example, intervals).

[0471] As an example, a case will be described in which one SCI includes information on the allocation of frequency resources for two slots. In this example, terminal 400 may notify information on the allocation of frequency resources for two slots, for example, from among the reserved time resources, by using the SCI.

[0472] For example, assume that the interval notified by the "resource reservation" included in the SCI is 20 ms, and the first allocated resource in the time domain is slot #0. In this case, terminal 400 may include the following information in the information (e.g., RIV) regarding the allocation of frequency resources in the SCI of slot #0. Sub-channel#1 Sub-channel#0,#1,#2

[0473] For example, of the above two-slot frequency resources notified in slot#0, sub-channel#1 corresponds to slot#0, slot#40, slot#80, ..., which are 40 ms apart from the first slot (e.g., slot#0), which is twice the interval of 20 ms. Also, of the above two-slot frequency resources notified in slot#0, sub-channels#0, #1, and #2 correspond to slot#20, slot#60, slot#100, ..., which are 40 ms apart from the second slot (e.g., slot#20), which is twice the interval of 20 ms.

[0474] Furthermore, terminal 400 may include the following information in the information (eg, RIV) regarding the allocation of frequency resources in the SCI of slot #20: Sub-channel#0,#1,#2 Sub-channel#1

[0475] Similarly, for example, of the two-slot frequency resources notified in slot #20, sub-channels #0, #1, and #2 correspond to slot #20, slot #60, slot #100, ..., which are 40 ms periods from the first slot (e.g., slot #20). Also, of the two-slot frequency resources notified in slot #20, sub-channel #1 corresponds to slot #40, slot #80, slot #120, ..., which are 40 ms periods from the second slot (e.g., slot #40).

[0476] As a modification of the operation example 7-3, as shown in FIG. 26, the frequency resources may be different between the resource for the initial transmission and the resource for the retransmission.

[0477] For example, in FIG. 26, terminal 400 may report information regarding frequency resource allocation for two slots of the reserved time resources by SCI.

[0478] In FIG. 26, for example, the interval notified by the "resource reservation" included in the SCI is 20 ms, and the first allocated resource in the time domain is slot#0.

[0479] As shown in FIG. 26, terminal 400 may include the following information in information (eg, RIV) regarding frequency resource allocation in the SCI of slot #0: Sub-channel#1 Sub-channel#0,#1,#2

[0480] For example, of the above two slots of frequency resources notified in slot#0, sub-channel#1 corresponds to slot#0, slot#20, slot#40, ..., which are resources for initial transmission at intervals of 20 ms, starting from the first slot (e.g., slot#0). Also, of the above two slots of frequency resources notified in slot#0, sub-channels#0, #1, and #2 correspond to slot#2, slot#22, slot#42, ..., which are resources for retransmission at intervals of 20 ms, starting from the second slot (e.g., slot#2).

[0481] Furthermore, as shown in FIG. 26, terminal 400 may include the following information in information (eg, RIV) regarding frequency resource allocation in the SCI of slot #2: Sub-channel#1 Sub-channel#0,#1,#2

[0482] For example, of the frequency resources for the two slots notified in slot#2, sub-channel#1 corresponds to slot#0, slot#20, slot#40, ..., which are resources for initial transmission at intervals of 20 ms, starting from the slot (e.g., slot#0) which is a resource for initial transmission corresponding to the retransmission resource of slot#2. Also, of the frequency resources for the two slots notified in slot#2, sub-channels#0, #1, and #2 correspond to slot#2, slot#22, slot#42, ..., which are resources for retransmission at intervals of 20 ms, starting from slot#2.

[0483] In other words, in FIG. 26, the above-mentioned two slots of frequency resources notified in slot #2 (at the time of retransmission) are the same as, for example, the two slots of frequency resources notified in slot #0 (at the time of initial transmission).

[0484] In addition, in the operation example 7-3, the TBS may be calculated according to, for example, the amount of resources for the initial transmission, may be calculated according to the amount of resources for retransmission, or may be predefined. Alternatively, the TBS may be calculated according to the larger amount of resources between the amount of resources for the initial transmission and the amount of resources for retransmission.

[0485] The above-mentioned allocation of frequency resources (e.g., sub-channels) for two slots is just an example, and other sub-channels may be allocated. Furthermore, the number of slots for which frequency resources can be notified by one SCI is not limited to two slots, and other slot numbers may be used.

[0486] [Example 7-4] In the operation example 7-4, one setting is selected (in other words, notified) by the SCI from among settings of frequency resource allocation in a plurality of time resources (for example, patterns of frequency resources).

[0487] In addition, multiple settings (in other words, multiple patterns) of frequency resource allocation may be specified, for example, in a specification (or standard), may be set in the SIM, may be set in an application layer called pre-configured, may be set in a higher layer such as an SIB or other RRC called configured, or may be set in the MAC.

[0488] Fig. 27 shows an example of four patterns of frequency resource allocation (patterns A, B, C, and D). Each of the four patterns shown in Fig. 27 includes, for example, allocation of frequency resources for four slots.

[0489] For example, the terminal 400 may notify the receiving terminal of the selected pattern from among the four patterns by means of an SCI (for example, 2-bit information).

[0490] According to the operation example 7-4, the settings of frequency resource allocation for a plurality of slots can be notified by a pattern, so that the notification bits in the SCI can be reduced compared to the case where the frequency resource allocation for each of a plurality of slots is notified individually.

[0491] Furthermore, the terminal 400 may notify, by means of the SCI, for example, the correspondence between the slot in which the SCI is transmitted and the 1st slot to the 4th slot shown in FIG.

[0492] For example, in the slots in which SCI is transmitted, if the current slot, slot #0, corresponds to the 3rd slot shown in FIG. 27, the interval is 20 ms, and Pattern B is notified, the following allocation will be made, starting from the current slot (3rd slot). slot#0:sub-channel#3,#4 (3rd slot) slot#20:sub-channel#3,#4 (4th slot) slot#40:sub-channel#1,#2 (1st slot) slot#60:sub-channel#1,#2 (2nd slot)

[0493] The receiving terminal may identify frequency resources in multiple slots based on, for example, information indicating a pattern and information indicating an association between slots included in the pattern and slots in which the SCI is transmitted.

[0494] For example, by making the slots in which the SCI is transmitted correspond to slots shown in FIG. 27 different from each other, frequency allocation can be set cyclically.

[0495] The above-mentioned allocation of frequency resources (e.g., sub-channels) for four slots is an example, and other sub-channels may be allocated. The number of slots for which frequency resources can be notified by one SCI is not limited to four slots, and may be other numbers of slots. The number of patterns is not limited to four patterns, and may be other numbers of patterns.

[0496] Operational examples 7-1 to 7-4 have been described above.

[0497] The embodiments of the present disclosure have been described above.

[0498] (Other embodiments) (1) In the first to third embodiments related to the setting of time resources, the information regarding the interval may be included in, for example, the first SCI. If the information regarding the interval is included in the first SCI, a terminal other than the receiving terminal can easily receive (in other words, monitor or sense) the SCI, making it easier to grasp the interval of the transmission time and reducing resource collisions.

[0499] Alternatively, in the above first to third embodiments, the information on the interval may be included in, for example, the second SCI. When the information on the interval is included in the second SCI, an increase in the number of bits of the first SCI can be suppressed, and the communication distance determined by the first SCI can be increased.

[0500] (2) In the fourth to seventh embodiments related to the configuration of frequency resources, not allocating a PSSCH or allocating a PSSCH to a part of reserved frequency resources has a significant effect, for example, when applied to a transmission in which resources are not reserved (for example, an initial transmission). Therefore, for example, the above embodiments may be applied at the time of the initial transmission of a TB or when an SCI that reserves resources is transmitted for the first time.

[0501] (3) In V2X, for example, due to the above-mentioned half duplex issue, other terminals may transmit signals in resources reserved for a terminal. Therefore, in the fourth to seventh embodiments related to the setting of frequency resources, not allocating a PSSCH or allocating a PSSCH to a part of the reserved frequency resources is effective in avoiding collision with transmission resources of other terminals even after the resources are reserved. Therefore, for example, the above-mentioned embodiments may be applied not only to the first transmission but also to retransmission or the first transmission of the next TB after resource reservation.

[0502] (4) In one embodiment of the present disclosure, the maximum number of resources reserved at one time by a terminal may be limited to a certain number, for example, 2, 4, 8, etc. In addition, the maximum value may be, for example, a fixed value defined in a specification (or standard), may be pre-configured in an application layer, or may be configured in a higher layer (e.g., MAC).

[0503] (5) Terminals that transmit and receive in the sidelink may include, for example, terminals that perform transmission processing but do not perform reception processing, terminals that perform reception processing but do not perform transmission processing, or terminals that perform both transmission and reception.

[0504] (6) When the side link-related settings are preconfigured in the terminal 200, 400, the side link-related settings may be, for example, set in a specification (e.g., a standard), may be set in an application layer called "pre-configured," may be set in a SIM provided in the terminal 200, 400, may be set in a higher layer such as an SIB or other RRC called "configured," or may be set in a MAC.

[0505] (7) In each operation example, consecutive slots are described, but the slots do not have to be consecutive in time. For example, the interval may be set using slots included in the sidelink resource pool.

[0506] (8) An embodiment of the present disclosure may be applied not only to sidelink communication (in other words, direct communication between a plurality of terminals) but also to Uu link communication (in other words, communication between the base station 100, 300 and the terminal 200, 400). In this case, for example, the channel arrangement in the sidelink described in each of the above embodiments may be replaced with the channel arrangement in the Uu link. For example, the PSCCH may be replaced with a downlink data channel (PDCCH: Physical Downlink Control Channel), the PSSCH may be replaced with a downlink data channel (PDSCH: Physical Downlink Shared Channel) or an uplink data channel (PUSCH: Physical Uplink Shared Channel), the PSFCH may be replaced with an uplink control channel (PUCCH: Physical Uplink Control Channel), and the PSBCH may be replaced with a broadcast channel (PBCH: Physical Broadcast Channel).

[0507] (9) In the above embodiment, for example, Mode 2 may be set as the mode of sidelink communication, and Mode 1 may not be set. In the case of Mode 2, terminals 200 and 400 can receive an SCI transmitted by another terminal and avoid transmission using the same resource as the resource indicated in the SCI. For example, terminals 200 and 400 can share resource reservation information with other terminals by notifying the other terminals of an interval.

[0508] (10) The operation examples of the above-mentioned embodiments may be used in combination. For example, time resources and frequency resources may be determined by combining at least one of the first to third embodiments relating to the method of determining time resources and at least one of the fourth to seventh embodiments relating to the method of determining frequency resources.

[0509] (11) The unit of time resource is not limited to slot, and may be, for example, a time resource unit such as frame, subframe, slot, subslot, or symbol, or may be another time resource unit. Also, the unit of frequency resource is not limited to sub-channel, and may be, for example, a frequency resource unit such as bandwidth part (BWP), resource block (e.g., PRB), resource block group (RBG), subcarrier, or resource element group (REG), or may be another frequency resource unit.

[0510] The present disclosure can be realized by software, hardware, or software in cooperation with hardware. Each functional block used in the description of the above embodiment may be realized partially or entirely as an LSI, which is an integrated circuit, and each process described in the above embodiment may be controlled partially or entirely by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip so as to include some or all of the functional blocks. The LSI may have input and output of data. Depending on the degree of integration, the LSI may be called an IC, a system LSI, a super LSI, or an ultra LSI.

[0511] The method of integration is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, after LSI manufacturing, a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor that can reconfigure the connections and settings of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing.

[0512] Furthermore, if a new integrated circuit technology that can replace LSI appears due to the progress of semiconductor technology or a derivative technology, it is possible to integrate the functional blocks using that technology. The application of biotechnology is also a possibility.

[0513] The present disclosure may be implemented in any type of apparatus, device, or system having a communication function (collectively referred to as a communication apparatus). The communication apparatus may include a radio transceiver and processing / control circuitry. The radio transceiver may include a receiver and a transmitter, or both as functions. The radio transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones, etc.), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks, etc.), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices, etc.), game consoles, digital book readers, telehealth and telemedicine devices, communication-enabled vehicles or mobile conveyances (e.g., cars, airplanes, boats, etc.), and combinations of the above devices.

[0514] Communications Equipment includes, but is not limited to portable or mobile equipment, non-portable or fixed equipment, devices and systems of any kind, such as smart home devices (appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines and any other "Things" that may exist on an Internet of Things (IoT) network.

[0515] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0516] A communications apparatus also includes devices, such as controllers and sensors, connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0517] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0518] A terminal according to one embodiment of the present disclosure includes a control circuit that determines first information indicating a frequency resource to be reserved and second information indicating a method of allocating channels to the frequency resource, and a transmission circuit that transmits the first information and the second information.

[0519] In an embodiment of the present disclosure, the allocation method indicates any one of allocation to the entire reserved frequency resources, allocation to a portion of the reserved frequency resources, and non-use of the reserved frequency resources.

[0520] In one embodiment of the present disclosure, when the allocation method is allocation to a portion of the reserved frequency resources, a transport block size of data is calculated based on a size of the entire reserved frequency resources.

[0521] In an embodiment of the present disclosure, the second information is information indicating a priority of data, and the priority is associated with the arrangement method.

[0522] In an embodiment of the present disclosure, the second information is information indicating a redundancy version, and the redundancy version is associated with the arrangement method.

[0523] In one embodiment of the present disclosure, the second information includes information indicating a redundancy version and information indicating a transmission type of either an initial transmission or a retransmission of data, and a combination of the redundancy version and the transmission type is associated with the placement method.

[0524] In an embodiment of the present disclosure, the second information is information indicating a retransmission process number, and the retransmission process number is associated with the allocation method.

[0525] In one embodiment of the present disclosure, the second information is included in a sidelink control channel.

[0526] In one embodiment of the present disclosure, the second information is included in a sidelink shared channel.

[0527] A terminal according to one embodiment of the present disclosure includes a receiving circuit that receives first information indicating frequency resources to be reserved and second information indicating a method of allocating channels to the frequency resources, and a control circuit that determines an arrangement of the channels based on the first information and the second information.

[0528] In a communication method according to one embodiment of the present disclosure, a terminal determines first information indicating frequency resources to be reserved and second information indicating a method of allocating channels to the frequency resources, and transmits the first information and the second information.

[0529] In a communication method according to one embodiment of the present disclosure, a terminal receives first information indicating frequency resources to be reserved and second information indicating a method of allocating channels to the frequency resources, and determines an allocation of the channels based on the first information and the second information.

[0530] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2019-184041, filed on October 4, 2019, are incorporated herein by reference in their entirety. [Industrial Applicability]

[0531] An embodiment of the present disclosure is useful in a mobile communication system. [Explanation of symbols]

[0532] 100,300 base stations 101,208 Interval setting section 102,209,302,409 Resource pool setting section 103,303 Error correction coding section 104.304 Modulation section 105,215,305.415 Signal Allocation Section 106,216,306,416 Transmitter 107,201,307,401 Receiver 108,202,308,402 Signal separation section 109,309 Demodulation section 110,310 Error correction decoding section 200,400 devices 203,403 SCI receiver 204,404 Uu demodulation section 205,405 Uu error correction decoding unit 206,406 SL demodulation section 207,407 SL error correction decoding section 210,410 SCI generation section 211,411 Uu error correction coding section 212,412 Uu modulation section 213,413 SL error correction coding section 214,414 SL modulation section 301,408 Frequency resource size setting unit< / pssch>

Claims

1. a receiver for receiving frequency information relating to a frequency resource; a control circuit for determining N frequency resources to reserve for the N time resources, each of the N frequency resources being different; Frequency information for the N frequency resources is received in the same sidelink control information; The N is determined from a set including two or more values, and information regarding the N is notified by a higher layer signal. Terminal device.

2. a first time resource among the N time resources is a slot in which the sidelink control information is transmitted, and a second time resource is indicated by a first time resource in the sidelink control information. The terminal device according to claim 1 .

3. the sidelink control information includes second time information, and time resources are periodically reserved from the first time resource based on the second time information. The terminal device according to claim 2.

4. The terminal device is receiving frequency information regarding N frequency resources; determining N frequency resources to reserve for the N time resources, each of the N frequency resources being different; Frequency information for the N frequency resources is received in the same sidelink control information; The N is determined from a set including two or more values, and information regarding the N is notified by a higher layer signal. Communication methods.

5. a first time resource among the N time resources is a slot in which the sidelink control information is transmitted, and a second time resource is indicated by a first time resource in the sidelink control information. The communication method according to claim 4.

6. the sidelink control information includes second time information, and time resources are periodically reserved from the first time resource based on the second time information. The communication method according to claim 5.

7. receiving frequency information relating to the N frequency resources from another terminal; determining N frequency resources to reserve for the N time resources, each of the N frequency resources being different; Control the Frequency information for the N frequency resources is received in the same sidelink control information; The N is determined from a set including two or more values, and information regarding the N is notified by a higher layer signal. Integrated circuits.

Images