Terminal and communication method

Abstract

The terminal of the present application includes: a control circuit that determines first information and second information, the first information including a second value obtained by dividing an interval of a time resource to be reserved by a first value, the second information indicating one of candidates of at least one of the association of the second value with the first information and a case where there are multiple candidates; and a transmission circuit that transmits the first information and the second information.

Description

TECHNICAL FIELD

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

[0002] A communication system called "fifth generation mobile communication system (5G)" is being studied. In 5G, a technology is studied which flexibly provides functions for each use case in which an increase in high-speed communication traffic, an increase in the number of connected terminals, high reliability, and low latency are required. The 3rd Generation Partnership Project (3GPP), which is an international standardization organization, has studied the advancement of a communication system from two aspects of the Long Term Evolution (LTE) system and New Radio (NR).

[0003] PRIOR ART DOCUMENTS

[0004] NON-PATENT DOCUMENTS

[0005] In the 3GPP, support for vehicle to everything (V2X) is studied in the LTE system. In NR, which can use a wider frequency band than the LTE system, support for V2X is also being studied (for example, refer to Non-Patent Document 1).

[0006] Non-Patent Document 1: 3GPP TR 38.885 V16.0.0, "Study on NR Vehicle-to-Everything (V2X) (Release 16), 2019-03 SUMMARY

[0007] However, there is room for further study regarding a method of improving the efficiency of resource (for example, at least one of a time resource and a frequency resource) allocation in wireless communication.

[0008] Non-limiting embodiments of the present disclosure are useful in providing a terminal and a transmission method capable of improving the efficiency of resource allocation in wireless communication.

[0009] A terminal of one embodiment of the present disclosure includes a control circuit that decides first information and second information, the first information including a second value obtained by dividing an interval of a time resource reserved by a first value, and the second information indicating one of candidates of at least one of an association of the second value with the first information and the first value in a case where there are a plurality of candidates of the at least one; and a transmission circuit that transmits the first information and the second information.

[0010] It should be noted that these general and specific integrated circuitry, computer programs, and recording media can be implemented not only by an arbitrary combination of a system, apparatus, method, integrated circuitry, computer program, and recording medium but also by any one of them alone.

[0011] According to one embodiment of the present disclosure, it is possible to improve the efficiency of resource allocation in wireless communication.

[0012] Further advantages and effects of one embodiment of the present disclosure will be clarified by the description and drawings. These advantages and / or effects are provided by respective features described in the specification and drawings, but it is not necessarily required to provide all of them in order to obtain one or more of the same features. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a diagram of an exemplary structure of a 3GPP NR system.

[0014] Figure 2 is a diagram showing functional separation between a Next Generation-Radio Access Network (NG-RAN) and a 5G Core (5GC).

[0015] Figure 3 is a timing chart of a sequence of setting / re-setting of a Radio Resource Control (RRC) connection.

[0016] Figure 4 is a diagram showing utilization scenarios of enhanced Mobile Broad Band (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communications (URLLC).

[0017] Figure 5 is a block diagram showing an exemplary 5G system structure for a non-roaming scenario.

[0018] Figure 6 is a diagram showing an example of allocation of resources.

[0019] Figure 7 is a diagram showing an example of association of Resource reservation with X.

[0020] Figure 8 is a block diagram showing a structure example of a terminal.

[0021] Figure 9 is a block diagram showing a structure example of a base station.

[0022] Figure 10 is a block diagram showing a structure example of a terminal.

[0023] Figure 11 is a flowchart showing an action example of a terminal.

[0024] Figure 12 is a diagram showing an example of association between resource reservation and X and W of Action Example 1-1.

[0025] Figure 13 is a diagram showing another example of association between resource reservation and X and W of Action Example 1-1.

[0026] Figure 14 is a diagram showing an example of association between resource reservation and X of Action Example 1-2.

[0027] Figure 15 is a diagram showing an example of a ring buffer.

[0028] Figure 16 is a diagram showing an example of allocation of resources of Action Example 3-1.

[0029] Figure 17 is a diagram showing an example of allocation of resources of Action Example 3-2.

[0030] Figure 18 is a diagram showing an example of a single subchannel of a standalone physical side link control channel (Standalone PSCCH) and PSCCH+physical sidelink shared channel (PSSCH).

[0031] Figure 19 is a block diagram showing a structure example of a terminal.

[0032] Figure 20 is a block diagram showing a structure example of a base station.

[0033] Figure 21 is a block diagram showing a structure example of a terminal.

[0034] Figure 22 is a flowchart showing an action example of a terminal.

[0035] Figure 23 is a diagram showing an allocation example of resources of Action Example 4-2.

[0036] Figure 24 is a diagram showing an allocation example of resources of Action Example 7-1.

[0037] Figure 25 is a diagram showing an allocation example of resources of Action Example 7-2.

[0038] Figure 26 is a diagram showing an allocation example of resources of Action Example 7-3.

[0039] Figure 27 is a diagram showing a pattern example of frequency resources of Action Example 7-4. DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present disclosure will be explained in detail with reference to the attached drawings.

[0041] < System structure and protocol stack of 5G NR >

[0042] 3GPP continues to work on the next release of the fifth generation mobile phone technology (also referred to simply as "5G") including the development of a new radio access technology (NR) that operates in the frequency range up to 100 GHz. The first version of the 5G standard has been completed in late 2017, which makes it possible to produce and commercialize terminals (for example, smartphones) that conform to the 5G NR standard.

[0043] For example, the system architecture as a whole envisages an NG-RAN with gNBs (gNodeBs). The gNB provides the user equipment (UE) side of the terminal with protocols of the user plane (Service Data Adaptation Protocol (SDAP) / Packet Data Convergence Protocol (PDCP) / Radio Link Control (RLC) / Medium Access Control (MAC) / Physical Layer (PHY)) and the control plane (Radio Resource Control (RRC)) of the NG radio access. The gNBs are connected to each other by means of an Xn interface. In addition, the gNBs are connected to a Next Generation Core (NGC) by means of a Next Generation (NG) interface, more specifically, to an Access and Mobility Management Function (AMF) by means of an NG-C interface (e.g., to a specific core entity of the AMF), and to a User Plane Function (UPF) by means of an NG-U interface (e.g., to a specific core entity of the UPF). The NG-RAN architecture is illustrated in Figure 1 (see, for example, 3GPP TS 38.300 v15.6.0, section 4).

[0044] The protocol stack of the user plane of NR (e.g., refer to 3GPP TS 38.300, section 4.4.1) includes a PDCP (Packet Data Convergence Protocol (refer to section 6.4 of TS 38.300)) sublayer, an RLC (Radio Link Control (refer to section 6.3 of TS 38.300)) sublayer, and a MAC (Medium Access Control (refer to section 6.2 of TS 38.300)) sublayer, which are terminated in the network side in the gNB. In addition, a new sublayer (SDAP: Service Data Adaptation Protocol) of the access stratum (AS) is introduced above the PDCP (e.g., refer to section 6.5 of 3GPP TS 38.300). In addition, the protocol stack of the control plane is defined for NR (e.g., refer to section 4.4.2 of TS 38.300). The outline of the functions of Layer 2 is described in section 6 of TS 38.300. The functions of the PDCP sublayer, the RLC sublayer, and the MAC sublayer are listed in sections 6.4, 6.3, and 6.2 of TS 38.300, respectively. The functions of the RRC layer are listed in section 7 of TS 38.300.

[0045] For example, the Medium-Access-Control layer handles multiplexing of logical channels, and includes scheduling and various functions related to scheduling including handling of various numerologies.

[0046] For example, the physical layer (PHY) takes charge of encoding, PHY HARQ (Hybrid Automatic Repeat Request) processing, modulation, multi-antenna processing, and mapping of signals to appropriate physical time-frequency resources. In addition, the physical layer handles mapping of transport channels to physical channels. The physical layer provides services to the MAC layer in the form of transport channels. The physical channels correspond to sets of time-frequency resources that are used to transmit specific transport channels, each transport channel mapping to a corresponding physical channel. For example, in the physical channels, the uplink physical channels include a physical random access channel (PRACH), a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH), and the downlink physical channels include a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), and a physical broadcast channel (PBCH).

[0047] In the use cases / rollout scenarios of NR, there can be included an enhanced mobile broadband (eMBB) having various conditions in terms of data rate, latency, and coverage, an ultra-reliable low-latency communication (URLLC), and a massive machine type communication (mMTC). For example, it is expected that the eMBB supports a peak data rate of about 3 times that of the data rate provided by the International Mobile Telecommunications-Advanced (IMT-Advanced) (20 Gbps in the downlink and 10 Gbps in the uplink) and a (user-experienced) data rate. On the other hand, in the case of URLLC, stricter requirements are proposed for ultra-low latency (0.5 ms (millisecond) in the case of the user plane, 1 ms in the case of the control plane, and 2 ms in the case of the user plane and control plane, respectively, in UL and DL) and high reliability (1-10 -5 In the case of mMTC, a high connection density (1,000,000 devices / km 2), wide coverage in harsh environments, and low-cost devices with ultra-long-life batteries (15 years).

[0048] Thus, a digital base configuration (e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval) for one use case of Orthogonal Frequency Division Multiplexing (OFDM) is sometimes ineffective in other use cases. For example, a low-latency service can prefer a shorter symbol length (hence, larger subcarrier spacing) and / or a smaller number of symbols per scheduling interval (also referred to as “Transmission Time Interval (TTI)”) than an mMTC service. Further, in a spread scenario where the delay spread of the channel is large, a longer CP length than the delay spread can be preferred. The subcarrier spacing can be optimized to maintain the same CP overhead depending on the case. The values of the subcarrier spacing supported by NR can be more than one. Correspondingly, subcarrier spacings of 15 kHz, 30 kHz, 60 kHz,... are currently under consideration. The symbol length T u and the subcarrier spacing Δf are related by the equation Δf = 1 / T u A direct relationship is established. As in the LTE system, the term “resource element” can be used to denote the smallest resource unit consisting of one subcarrier with respect to the length of one OFDM / Single-carrier Frequency-Division Multiple Access (SC-FDMA) symbol.

[0049] In the new radio system 5G-NR, with respect to each digital base configuration and each carrier, the resource grid of subcarriers and OFDM symbols is defined for the uplink and the downlink, respectively. Each element of the resource grid is referred to as a “resource element,” and is specified based on the frequency index in the frequency domain and the symbol position in the time domain (refer to 3GPP TS 38.211 v15.6.0).

[0050] <Function separation between NG-RAN and 5GC in 5G NR>

[0051] Figure 2 The function separation between NG-RAN and 5GC is indicated. The logical node of the NG-RAN is a gNB or an ng-eNB. The 5GC has logical nodes AMF, UPF, and Session Management Function (SMF).

[0052] For example, the gNB and the ng-eNB assume the following main functions:

[0053] - Radio Bearer Control, Radio Admission Control, Connection Mobility Control, dynamic allocation (scheduling) of resources for UEs in both uplink and downlink, etc. Radio Resource Management functions;

[0054] - Internet Protocol (IP) header compression, encryption, and integrity protection of data;

[0055] - selection of an AMF when connecting a UE in case that it is not possible to decide the routing to the AMF based on the information provided by the UE;

[0056] - routing of user plane data towards a UPF;

[0057] - routing of control plane information towards an AMF;

[0058] - setting up and releasing of connections;

[0059] - scheduling and transmitting of paging messages;

[0060] - scheduling and transmitting of system information (AMF or Operation, Admission, Maintenance (OAM) as origin);

[0061] - configuration of measurements and measurement reporting for mobility and scheduling;

[0062] - packet marking in uplink at transmission level;

[0063] - session management;

[0064] - support of network slicing;

[0065] - management of Quality of Service (QoS) flows and mapping of data radio bearers;

[0066] - support of UEs in RRC_INACTIVE state;

[0067] - function of issuing Non-Access Stratum (NAS) messages;

[0068] - sharing of radio access networks;

[0069] - dual connectivity;

[0070] - NR tight interworking with E-UTRA.

[0071] The Access and Mobility Management Function (AMF) assumes the following main functions:

[0072] - Function to terminate Non-Access Stratum (NAS) signaling;

[0073] - Security of NAS signaling;

[0074] - Security control of Access Stratum (AS);

[0075] - Interworking with 3GPP access network node signaling for mobility management;

[0076] - Possible reachability to UE in idle mode (including retransmission control and execution of paging);

[0077] - Management of registration area;

[0078] - Support of intra-system and inter-system mobility;

[0079] - Access authentication;

[0080] - Access authorization including check of roaming permission;

[0081] - Mobility management control (attach and policy);

[0082] - Support of network slicing;

[0083] - Selection of Session Management Function (SMF).

[0084] Further, the User Plane Function (UPF) assumes the following main functions:

[0085] - Anchor point for intra-Radio Access Technology (intra-RAT) mobility / Inter-Radio Access Technology (inter-RAT) mobility (where applicable);

[0086] - External Protocol Data Unit (PDU) session point of interconnect to data network;

[0087] - Routing and forwarding of data packets;

[0088] - Packet inspection and Policy rule enforcement for user plane part;

[0089] - Reporting of traffic usage;

[0090] - uplink classifier for supporting routing of traffic flows to the data network;

[0091] - Branching Point for supporting multi-homed PDU session;

[0092] - QoS handling for user plane (e.g. packet filtering, gating, Upload / Download rate enforcement);

[0093] - verification of uplink traffic (mapping of SDF to QoS flows);

[0094] - buffering of downlink packets and punishment function of downlink data notification.

[0095] Finally, the Session Management Function (SMF) assumes the following main functions:

[0096] - Session management;

[0097] - allocation and management of IP address for the UE;

[0098] - selection and control of UPF;

[0099] - setting function of traffic steering in the User Plane Function (UPF) for routing traffic to the appropriate destination;

[0100] - policy enforcement and QoS of the control part;

[0101] - notification of downlink data.

[0102] < Setting and re-setting sequence of RRC connection >

[0103] Figure 3 indicates some interactions between the UE, gNB and AMF (5GC entity) of the NAS part when the UE is converted from RRC_IDLE to RRC_CONNECTED (refer to TS 38.300 v15.6.0).

[0104] The RRC is signaling (protocol) for setting the upper layer of the UE and the gNB. Through this conversion, the AMF prepares UE context data (which includes, for example, PDU session context, security key, UE radio capability, UE security capabilities, and the like) and transmits an INITIAL CONTEXT SETUP REQUEST to the gNB. Then, the gNB activates AS security together with the UE. This is done by the gNB sending a Security Mode Command message to the UE, and the UE responding to the gNB with a Security Mode Complete message. Thereafter, by the gNB sending an RRC Reconfiguration message to the UE, the gNB receives an RRC Reconfiguration Complete from the UE in correspondence thereto, and performs a reconfiguration for setting a signaling radio bearer 2 (SRB2) and a data radio bearer (DRB). With respect to a connection by signaling only, since the SRB2 and the DRB are not set, the steps regarding the RRC Reconfiguration are omitted. Finally, the gNB notifies the AMF that the setting sequence has been completed by an INITIAL CONTEXT SETUP RESPONSE.

[0105] Accordingly, the present disclosure provides an entity of a fifth generation core (5GC) (e.g., an AMF, an SMF, or the like) that has: control circuitry that, when in operation, establishes a next generation (NG) connection with a gNodeB; and a transmission unit that, when in operation, transmits, to the gNodeB via the NG connection, an initial context setup message to set a signaling radio bearer between the gNodeB and a user equipment (UE). Specifically, the gNodeB transmits, to the UE via the signaling radio bearer, a radio resource control (RRC) signaling including a resource allocation setting information element (IE). Then, the UE performs transmission in an uplink or reception in a downlink based on the resource allocation setting.

[0106] <Utilization scenarios for IMT in 2020 and beyond>

[0107] Figure 4Indicates several use cases for 5G NR. In the Third Generation Partnership Project New Radio (3GPP NR), three use cases are studied to support a variety of services and applications envisioned by IMT-2020. The planning of the first phase specification for the first use case, enhanced mobile broadband (eMBB), has been completed. In the current and future work, in addition to expanding the support of eMBB, standardization for ultra-reliable low-latency communication (URLLC) and massive machine type communication (mMTC) is also included. Figure 4 Indicates some examples of conceptual usage scenarios for IMT beyond 2020 (e.g., refer to ITU-R M.2083 Figure 2 ).

[0108] URLLC has strict conditions on performance such as throughput, latency (delay), and availability in its use cases. The use case of URLLC is envisioned as one of the essential technologies for implementing applications such as wireless control of industrial production processes or manufacturing processes, remote medical surgery, power transmission and distribution automation in smart grids, traffic safety, etc. in the future. Ultra-high reliability of URLLC is supported by specifying techniques that meet the conditions set by TR 38.913. In NR URLLC of Release 15, as important conditions, the target latency of the user plane is 0.5 ms for UL (uplink) and 0.5 ms for DL (downlink). The general condition for URLLC for one packet transmission is that the block error rate (BLER) is 1E-5 for a packet size of 32 bytes in the case where the latency of the user plane is 1 ms.

[0109] From a physical layer point of view, reliability can be improved by many methods that can be adopted. The current space for reliability improvement includes defining separate channel quality indicator (CQI) tables for URLLC, more compact downlink control indication (DCI) formats, PDCCH iteration, etc. However, as NR (important conditions for NR URLLC) becomes more stable and more developed, the margin for achieving ultra-high reliability can expand. In the specific use cases of NR URLLC of Release 15, applications such as augmented reality / virtual reality (AR / VR), e-health, e-safety, and mission-critical are included.

[0110] In addition, the target technology enhancement of NR URLLC aims to improve latency and increase reliability. The technology enhancements for improving latency include a numerology that can be set, variable mapping of non-slot-based scheduling, grant-free (set grant) uplink, slot-level repetition in a data channel, and pre-emption of downlink. Pre-emption means that a transmission that has been allocated a resource is stopped for other transmission of a later required condition of lower latency / higher priority. Thus, the already allowed transmission will be replaced by the later transmission. Pre-emption is applicable regardless of the specific service type. For example, a transmission of service type A (URLLC) can be replaced by a transmission of service type B (eMBB or the like). Among the technology enhancements for increasing reliability, a dedicated CQI / modulation and coding scheme (MCS) table for a target BLER of 1E-5 is included.

[0111] The use case characteristics of mMTC are typically that a large number of connected devices transmit a relatively small amount of data that is not susceptible to delay. The devices require low cost and very long battery life. From the NR perspective, utilizing a very narrow bandwidth part from the UE is one solution to save power and enable longer battery life.

[0112] As described above, the range of reliability improvement of NR is expected to be wider. One of the important conditions in all cases, for example, with respect to URLLC and mMTC, is high reliability or ultra-high reliability. From the wireless perspective and the network perspective, there are several mechanisms that can improve reliability. In general, there are two to three important areas that can contribute to improving reliability. These areas include compact control channel information, data channel / control channel repetition, and diversity with respect to frequency, time, and / or spatial region. These areas are generally applicable to improving reliability regardless of the specific communication scenario.

[0113] With respect to NR URLLC, more use cases with more stringent conditions are envisioned, such as factory automation, transportation, and distribution of power. The stringent conditions are high reliability (reliability up to 10 －6 -6), high availability, data packet size up to 256 bytes, time synchronization up to several μs (depending on the use case, depending on the frequency range, and short latency of about 0.5 ms to 1 ms (e.g., target user plane latency of 0.5 ms), the value can be set to 1 μs or several μs).

[0114] Further, with respect to NR URLLC, there can be some enhancements from a physical layer perspective. These enhancements include compact DCI related enhancements to PDCCH, PDCCH repetition, increased monitoring of PDCCH. In addition, uplink control information (UCI) enhancements are related to enhancements of HARQ and CSI feedback. In addition, there can be PUSCH enhancements related to frequency hopping at mini-slot level and enhancements of retransmission / iteration. The term "mini-slot" refers to a transmission time interval (TTI) that includes a small number of symbols (a slot has 14 symbols).

[0115] <QoS Control>

[0116] The QoS model of 5G supports both QoS flows that require a guaranteed flow bit rate (GBR: Guaranteed Bit Rate QoS flow) and QoS flows that do not require a guaranteed flow bit rate (non-GBR QoS flow) based on QoS flows. Therefore, at the NAS level, the QoS flow is the finest granularity of QoS differentiation in a PDU session. The QoS flow is specified in a PDU session by a QoS Flow ID (QFI: QoS Flow ID) carried in an encapsulation header over the NG-U interface.

[0117] With respect to each UE, the 5GC establishes one or more PDU sessions. With respect to each UE, for a PDU session, the NG-RAN establishes at least one DRB, for example, as described above Figure 3 In addition, additional DRBs can be configured later for QoS flows of the PDU session (as to when, it depends on the NG-RAN). The NG-RAN maps packets belonging to various PDU sessions to various DRBs. The UL and DL packets are associated with QoS flows by the NAS level packet filters in the UE and 5GC, and, in contrast, the UL and DL QoS flows are associated with DRBs by the AS level mapping rules in the UE and NG-RAN.

[0118] Figure 5 The non-roaming reference architecture for 5G NR (refer to TS 23.501 v16.1.0, section 4.23) is shown. An Application Function (AF) (e.g., a 5G ProSe Function) is connected to the 5G core network (5GC) via an N2 interface. The 5GC includes a ProSe Function (ProSe-F) that is connected to the 5G core network (5GC) via an N15 interface. Figure 4An external application server (e.g., a 5G service-providing application server) illustrated in the middle interacts with the 3GPP core network to provide a service. For example, an access network exposure function (Network Exposure Function: NEF) to support an application affecting traffic routing, or interaction with a policy framework for policy control (e.g., QoS control) (refer to a policy control function (Policy Control Function: PCF)). An application function that is considered reliable by the operator based on the operator's configuration can directly interact with the associated network function. An application function that is not allowed by the operator to directly access the network function interacts with the relevant network function through the NEF using an external exposure framework.

[0119] Figure 5 Further, more functional units representing the 5G structure, i.e., a network slice selection function (Network Slice Selection Function: NSSF), a network repository function (Network Repository Function: NRF), a unified data management (Unified Data Management: UDM), an authentication server function (Authentication Server Function: AUSF), an access and mobility management function (AMF), a session management function (SMF), and a data network (Data Network: DN) (e.g., an operator-provided service, Internet access, or a third-party-provided service) are indicated. All or a part of the functions of the core network and the application service can be deployed and operated in a cloud computing environment.

[0120] Accordingly, the present disclosure provides an application server (e.g., an AF of a 5G structure) including a transmission unit that transmits, to at least one of 5GC functions (e.g., an NEF, an AMF, an SMF, a PCF, a UPF, etc.) a requirement including a QoS condition for at least one of an URLLC service, an eMBB service, and an mMTC service in order to establish a PDU session including a radio bearer between a gNodeB and a UE corresponding to the QoS condition when the application server operates; and a control circuit that provides a service using the established PDU session when the application server operates.

[0121] [V2X]

[0122] V2X, for example, envisions communication between vehicles (V2V: Vehicle to Vehicle), between a road and a vehicle (V2I: Vehicle to Infrastructure), between a vehicle and a pedestrian (V2P: Vehicle to Pedestrian), or between a vehicle and a network (V2N: Vehicle to Network).

[0123] In V2V, V2I, or V2P, for example, a terminal (or also referred to as “user equipment (UE)”) can directly receive and transmit between terminals without going through a network with a base station (e.g., base station (BS), or also referred to as “gNB” in NR, or also referred to as “eNB” in LTE), using a link called “sides link (SL)” or “PC5”. In addition, in V2N, for example, communication is envisioned via a link (e.g., also referred to as “Uu”) between a base station and a terminal.

[0124] The resources used by the sidelink are set, for example, by a SL Band width part (BWP, bandwidth part) and a resource pool.

[0125] The SL BWP is, for example, a frequency band that a terminal can use for the sidelink. The SL BWP can be set separately from a Downlink (DL) BWP and an Uplink (UL) BWP set in a link between a base station and a terminal (e.g., a Uu link). Also, it is possible that the frequency band overlaps between the SL BWP and the UL BWP.

[0126] The resource pool includes, for example, resources specified in the frequency domain (e.g., also referred to as “frequency direction” or “frequency axis”) and the time domain (e.g., also referred to as “time direction” or “time axis”) within the SL BWP. For example, multiple resource pools can be set for one terminal.

[0127] [Sidelink in NR]

[0128] In NR V2X, it is being studied to support, for example, unicast, groupcast, and broadcast in the transmission and reception of the sidelink.

[0129] In unicast, for example, one-to-one transmission from a transmitting terminal (e.g., also referred to as “transmitter UE” or “Tx UE”) to a receiving terminal (e.g., also referred to as “receiver UE” or “Rx UE”) is envisioned. In addition, in groupcast, for example, transmission from a transmitting terminal to multiple receiving terminals included in a certain group is envisioned. In addition, in broadcast, for example, transmission from a transmitting terminal without specifying a receiving terminal is envisioned.

[0130] In addition, in sidelink of NR, for example, the following channel configuration is studied.

[0131] < PSCCH : Physical Sidelink Control Channel >

[0132] In the PSCCH, for example, a control signal called "sidelink control information (SCI)" is transmitted and received. The SCI includes, for example, information on the transmission and reception of a PSSCH such as resource allocation information of a data signal (e.g., PSSCH).

[0133] In addition, for example, the SCI can include information on a transmitting terminal (in other words, a transmission source terminal) (e.g., Layer 1 source ID) and information on a receiving terminal (in other words, a transmission destination terminal) (e.g., Layer 1 destination ID). By this information, the transmitting terminal and the receiving terminal are specified.

[0134] < PSSCH >

[0135] In the PSSCH, for example, a data signal is transmitted and received.

[0136] < PSFCH : Physical SL Feedback Channel >

[0137] In the PSFCH, for example, a feedback signal (e.g., HARQ feedback) for a PSSCH (e.g., a data signal) is transmitted and received. The feedback signal can include, for example, a response signal (e.g., also called "ACK / NACK information", "HARQ-ACK") indicating acknowledgement (ACK) or negative acknowledgement (NACK). For the feedback signal, for example, application in a case where the PSSCH is transmitted and received by unicast and groupcast is studied. The ACK and the NACK can be called, for example, "HARQ-ACK" and "HARQ-NACK", respectively.

[0138] < PSBCH : Physical SL Broadcast Channel >

[0139] In the PSBCH, a broadcast signal is transmitted and received.

[0140] [Communication mode of sidelink]

[0141] The communication of the sidelink includes, for example, 2 modes (e.g., mode 1 and mode 2).

[0142] In Mode 1, the base station decides (in other words, schedules) resources (referred to as "SL resources", for example) used by the terminal in the sidelink.

[0143] In Mode 2, the terminal decides SL resources from within a resource pool set in advance. In other words, in Mode 2, the base station does not schedule SL resources.

[0144] Mode 1 is used in an environment where, for example, a terminal performing sidelink communication is assumed to be able to receive an instruction from a base station. In Mode 2, for example, since a terminal can perform transmission without an instruction from a base station, sidelink communication can be performed by terminals under different operators, or terminals out of coverage, for example.

[0145] The above describes the sidelink.

[0146] In V2X of LTE, for example, it is assumed that a signal is periodically transmitted in the time domain. By this assumption, in a terminal, for example, a time resource (for example, a slot) later than a time resource (for example, a slot) for a signal notified by SCI is reserved. The SCI notifying the reserved resource (in other words, the allocated resource) can be received by other terminals in addition to the terminal to which the resource is allocated (in other words, the terminal to which the SCI is transmitted). In other words, the resource reserved by the SCI can be detected by other terminals different from the terminal to which the resource is allocated. Each terminal, when selecting a resource to be used, for example, can reduce the probability of resource collision by avoiding the use of a resource reserved for another terminal.

[0147] The format of SCI (for example, "SCI format 1") as a control signal transmitted in PSCCH, for example, includes the following information.

[0148] "Priority" (for example, 3 bits):

[0149] "Priority" is information notifying the priority of a transport block (TB: Transport Block) transmitted in PSSCH.

[0150] "Resource reservation" (for example, 4 bits):

[0151] "Resource reservation" is information notifying the time interval of a TB included in PSCCH transmitted in the same slot as PSCCH in which SCI is configured, and 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, respectively (in other words, the interval between TBs).

[0152] "Frequency resource location of initial transmission and retransmission"

[0153] The "frequency resource location of initial transmission and retransmission" is information of allocating a resource in a frequency domain in units of sub-channels. For example, the terminal can assume using the frequency resource shown by the information in both the slot configured with the SCI and the slot scheduled after the slot. Further, in the frequency domain, a continuous sub-channel can be allocated. The number of bits of the "frequency resource location of initial transmission and retransmission" is, for example, as shown in the following table.

[0154]

[0155] Here, N subchannel SL For example, indicates the total number of sub-channels within the resource pool.

[0156] "Time gap between initial transmission and retransmission" (for example, 4 bits):

[0157] The "time gap between initial transmission and retransmission" is information that notifies of a time gap (for example, also referred to as a "gap") between the initial transmission and the retransmission of the same TB.

[0158] "Modulation and coding scheme" (for example, 5 bits):

[0159] The "modulation and coding scheme" is information that notifies of a modulation and coding scheme (MCS).

[0160] "Retransmission index" (for example, 1 bit):

[0161] The "retransmission index" is information that notifies of whether it is the initial transmission or the retransmission.

[0162] The LTE allocates (in other words, schedules) resources of a plurality of TBs based on the information of the above-described SCI, for example. In the LTE, for example, it is possible to schedule resources of 4 slots of the transmission (for example, the initial transmission) of a TB, the retransmission of the TB, the transmission (for example, the initial transmission) of a next TB different from the TB, and the retransmission of the next TB in the slot configured with the SCI.

[0163] The information included in the SCI format 1 is described above.

[0164] Figure 6 An example of allocating a resource using the SCI is shown.

[0165] In Figure 6 , as an example, a time resource corresponding to 1 ms is described as "slot", but the unit of the time resource corresponding to 1 ms is not limited to slot. For example, in LTE, a time resource corresponding to 1 ms is called "subframe".

[0166] Figure 6 In , as an example, subchannel #1 and subchannel #2 are allocated to the terminal in the frequency domain. The subchannel is notified to the terminal by, for example, "resource frequency position of initial transmission and retransmission". In addition, for the terminal, the initial transmission of TB #1 is allocated to slot #0 in the time domain.

[0167] In addition, Figure 6 , as an example, in the SCI of slot #0 that notifies the initial transmission allocated to TB #1, the interval between TBs notified by "resource reservation" is set to 100 ms (for example, a time interval of 100 slots). In addition, Figure 6 , as an example, in the SCI of slot #0 that notifies the initial transmission allocated to TB #1, the time interval (or gap) between the initial transmission and the retransmission notified by "time interval between initial transmission and retransmission" is set to 2 ms (for example, a time interval of 2 slots).

[0168] In Figure 6 , as an example, for the terminal, each of the slots (for example, slot #0, slot #100, slot #200,...) that are 100 ms apart from slot #0 and the slots (for example, slot #2, slot #102, slot #202,...) that are 100 ms apart from slot #2 are reserved, for example, by the information included in the SCI transmitted in slot #0. In addition, in Figure 6 , as an example, in the resource allocation in the frequency domain shown in , for example, by the information included in the above SCI, for the terminal, subchannels #1, #2 in each of the slots reserved are reserved.

[0169] In addition, Figure 6For example, there might be a situation where the terminal fails to receive the SCI sent in time slot #0, but successfully receives the SCI sent in time slot #2. In this case, the terminal, for example, notifies the TB sent in time slot #2 that it is a retransmission based on the "retransmission index" included in the SCI sent in time slot #2, and notifies the time interval between the initial transmission and the retransmission (e.g., 2ms or a 2-time slot interval) through the "time interval between the initial transmission and the retransmission". For example, based on these notifications, the terminal can specifically (in other words, identify or determine) the time resource allocated to the initial transmission of the TB as time slot #0 where the SCI reception failed. Therefore, even if the terminal fails to receive the SCI, it is possible to reserve a 100ms period time slot from time slot #0, a 100ms period time slot from time slot #2, and sub-channels #1 and #2 in each of these time slots for the terminal.

[0170] The above provides an explanation of LTE V2X.

[0171] However, methods for reserving (or allocating) resources in NR V2X sidelinks have not been sufficiently studied. Therefore, in one embodiment of this 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., subchannels), is described.

[0172] (Implementation Method 1)

[0173] In this embodiment, the method for setting time resources in sidelink communication is described.

[0174] In LTE, after the "resource reservation" is notified to the terminal (e.g., the receiving terminal) by the SCI, the terminal refers to, for example... Figure 7 The relationship between "Resource Reservation" and the value "X" for the interval between TBs (e.g., represented in a table) determines the interval between TBs. For example... Figure 7 The value “X” shown is the value obtained by dividing the interval between TBs by 100. Figure 7 The association between "resource reservation" and "X" shown can be communicated to each terminal from the base station via notification (or setting) at the upper level.

[0175] For example, terminal reference Figure 7 The association shown can be set to an interval of X×100ms, such as 20ms, 50ms, or 100Xms (multiples of 100, where X is an integer from 1 to 10). LTE (for example, Figure 7 In the terminal settings, 20ms (X=0.2) is the shortest interval and 1000ms (X=10) is the longest interval.

[0176] However, in NR, it is required to support more diversified service types than LTE. Therefore, in NR, it is also conceivable that, for example, the same interval as that which can be set in LTE (for example, 20 ms) cannot be set. For example, in NR, an interval shorter than the shortest interval = 20 ms which can be set in LTE (for example, Figure 7 ) can be set. Alternatively, in NR, an interval longer than the longest interval = 1000 ms which can be set in LTE (for example, Figure 7 ) can be set. Figure 7

[0177] In this regard, in one embodiment of the present disclosure, a method of more flexibly setting a time resource (for example, an interval) in sidelink communication is described.

[0178] [Outline of communication system]

[0179] The communication system of the present embodiment includes a base station 100 and a terminal 200.

[0180] Figure 8 is a block diagram showing a part of a structure example of the terminal 200 of the present embodiment. In the terminal 200 shown in Figure 8 , a control section (for example, corresponding to a control circuit) decides first information and second information, the 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 the second information indicating one of candidates of at least one of the association of the second value and the first information (for example, a table described later) and the first value in a case where there are a plurality of candidates of the at least one. A communication section (for example, corresponding to a communication circuit) transmits the first information and the second information (for example, SCI).

[0181] Alternatively, in the terminal 200 shown in Figure 8 , a communication section (for example, corresponding to a reception circuit) receives first information and second information, the 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 the second information (for example, SCI) indicating one of candidates of at least one of the association of the second value and the first information (for example, a table described later) and the first value (W) in a case where there are a plurality of candidates of the at least one. A control section (for example, corresponding to a control circuit) decides an interval (for example, X × W) based on the first information and the second information.

[0182] [Structure of base station]

[0183] Figure 9 is a block diagram showing a structure example of the base station 100 of the present embodiment. Figure 9 ​In the present embodiment, the base station 100 includes an interval setting section 101, a resource pool setting section 102, an error correction encoding section 103, a modulation section 104, a signal allocation section 105, a transmission section 106, a reception section 107, a signal separation section 108, a demodulation section 109, and an error correction decoding section 110.

[0184] The interval setting section 101 sets candidates of intervals (in other words, time intervals) between different TBs (e.g., new TBs). The interval setting section 101 can set interval candidates for each resource pool allocated to the terminal 200, for example. The interval setting section 101 outputs information (hereinafter referred to as "interval candidate information") about the set interval candidates to the resource pool setting section 102. In addition, the interval setting section 101 outputs signaling of an upper layer including the interval candidate information to the error correction encoding section 103.

[0185] The resource pool setting section 102 sets a resource pool used in sidelink for each terminal 200. The resource pool setting section 102 can generate information (hereinafter referred to as "resource pool setting information") about time resources and frequency resources of a resource pool based on the interval candidate information input by the interval setting section 101, for example. The resource pool setting section 102 outputs signaling of an upper layer including the resource pool setting information to the error correction encoding section 103. In addition, the resource pool setting section 102 outputs the resource pool setting information to the signal allocation section 105 and the signal separation section 108.

[0186] The error correction encoding section 103 performs error correction encoding on input signals including a transmission data signal (DL data signal) and signaling of an upper layer input by the interval setting section 101 and the resource pool setting section 102, and outputs the encoded signals to the modulation section 104.

[0187] The modulation section 104 performs modulation processing on the signals input by the error correction encoding section 103, and outputs the modulated data signals to the signal allocation section 105.

[0188] The signal allocation section 105 allocates the data signals (e.g., DL data signals or upper layer signaling) input by the modulation section 104 to resources that can be used in a link (e.g., a Uu link) between the base station 100 and the terminal 200, for example. The formed transmission signals are output to the transmission section 106.

[0189] The signal allocation section 105 specifies (in other words, identifies) time slots that can be used in sidelink communication based on the information input by the resource pool setting section 102, for example. Then, the signal allocation section 105 can allocate data signals to resources that are not used for sidelink, for example, in a case where the terminal 200 cannot simultaneously transmit and receive in a link (e.g., a Uu link) for DL data and in sidelink.

[0190] Furthermore, the resource pool configuration can be different for each terminal 200. In this case, the time slots available for use on the Uu link are different for each terminal 200.

[0191] The transmitting unit 106 performs up-conversion and other wireless transmission processing on the signal input from the signal distribution unit 105 and transmits it to the terminal 200 via the antenna.

[0192] The receiving unit 107 receives the signal transmitted by the antenna receiving terminal 200, performs down-conversion and other receiving processing, and then outputs it to the signal separation unit 108.

[0193] The signal separation unit 108, based on information input, for example, by the resource pool setting unit 102, specifies time slots that can be used for Uu link communication and time slots that can be used for side link communication. Then, the signal separation unit 108 separates the signals that are input by the receiving unit 107 and allocated to the resources that can be used for Uu link communication. The signal separation unit 108 outputs the separated signals (e.g., UL data signals) to the demodulation unit 109.

[0194] The demodulation unit 109 performs demodulation processing on the signal input from the signal separation unit 108 and outputs the obtained signal to the error correction decoding unit 110.

[0195] The error correction decoding unit 110 decodes the signal input from the demodulation unit 109 to obtain the received data signal (UL data signal) from the terminal 200.

[0196] Furthermore, at Figure 9 The example shown illustrates a scenario where the base station 100 includes an interval setting unit 101 and a resource pool setting unit 102, generating upper-layer signaling that includes interval candidate information and resource pool setting information, but is not limited to this. For example, at least one of the interval candidate information and resource pool setting information can be set at the application layer, referred to as "pre-configured," or pre-set in the subscriber identity module (SIM). In this case, the base station 100 may use the pre-set information without generating interval candidate information or resource pool setting information. For example, the base station 100 may identify time slots that can be used between the base station 100 and the terminal 200 based on the pre-set resource pool setting information, and output information indicating time slots that can be used between the base station 100 and the terminal 200 to the signal distribution unit 105 and the signal separation unit 108.

[0197] In addition, the case where the setting of the time resources (for example, information on the interval) in the sidelink communication is set (or notified) by the base station 100 to the terminal 200, for example, by the signaling of the upper layer (for example, RRC) or MAC, is described here, but is not limited thereto. For example, in the case where the setting of the time resources (for example, information on the interval) in the sidelink communication is specified in the specification (or the standard), the terminal 200 is able to act even without the setting from the base station 100, in the case where it is set in the SIM or the application layer.

[0198] In addition, for example, in the case where the mode of the sidelink communication is "mode 1", it is conceivable that the information included in the SCI transmitted by the terminal in the sidelink is generated by the base station 100. Therefore, in the case of mode 1, the base station 100, for example, can generate the SCI (the same processing as the SCI generation section 210 of the terminal 200 described later) based on the interval candidate information and the resource pool setting information, and transmit it to the terminal 200. Further, the SCI can be included, for example, in the signaling of the upper layer or in the signal (for example, PDCCH) of the physical layer.

[0199] [Structure of terminal]

[0200] Figure 10 is a block diagram showing an example of the structure of the terminal 200 of the present embodiment. Figure 10 In the drawing, the terminal 200 includes a reception section 201, a signal separation section 202, an SCI reception section 203, a Uu demodulation section 204, a Uu error correction decoding section 205, an SL demodulation section 206, an SL error correction decoding section 207, an interval setting section 208, a resource pool setting section 209, an SCI generation section 210, a Uu error correction encoding section 211, a Uu modulation section 212, an SL error correction encoding section 213, an SL modulation section 214, a signal distribution section 215, and a transmission section 216.

[0201] Figure 8 The control circuit shown in the drawing can include, for example, the SCI reception section 203, the interval setting section 208, the resource pool setting section 209, and the SCI generation section 210. In addition, Figure 8 The communication circuit shown in the drawing can include, for example, the reception section 201 and the transmission section 216.

[0202] The reception section 201 receives a signal via an antenna, and outputs it to the signal separation section 202 after performing a reception process such as down-conversion.

[0203] In addition, the reception section 201 specifies the time resources in which the signal of the sidelink transmitted by a certain terminal 200 (in other words, the transmitting terminal) is received, for example, based on the interval information (described later) input by the SCI reception section 203. The reception section 201 can set the state of the terminal 200 to a reception state in the specified time resources, for example.

[0204] The signal separation section 202 separates the signal component corresponding to the link (for example, the Uu link) between the base station 100 and the terminal 200 from the signal input by the reception section 201, based on the resource pool setting information input by the resource pool setting section 209, and outputs the signal to the Uu demodulation section 204.

[0205] In addition, the signal separation section 202 separates the signal component of the sidelink from the signal input by the reception section 201, based on the resource pool setting information. Then, the signal separation section 202 outputs, for example, the signal of the PSCCH in the signal component of the sidelink to the SCI reception section 203. In addition, the signal separation section 202 separates the signal of the PSSCH for the terminal 200 from the signal component of the sidelink input by the reception section 201, based on the resource allocation information input by the SCI reception section 203, and outputs the signal to the SL demodulation section 206.

[0206] The SCI reception section 203 demodulates and decodes the signal component of the PSCCH input by the signal separation section 202. The SCI reception section 203, for example, attempts demodulation and decoding of the signal of the PSCCH, and in the case where decoding is successful (in other words, in the case where the SCI included in the PSCCH is detected), outputs the resource allocation information of the PSSCH for the terminal 200 included in the SCI to the signal separation section 202. Further, the SCI reception section 203, for example, determines whether the information included in the SCI is information for the terminal 200, based on the transmission destination information included in the SCI.

[0207] In addition, the SCI reception section 203, for example, specifies the interval of the time resources to which the PSSCH for the terminal 200 is allocated. The SCI reception section 203 can determine the interval, for example, based on the interval candidate information input by the interval setting section 208, the "resource reservation" included in the SCI for the terminal 200, or information (described later) related to the determination of the interval. The SCI reception section 203 outputs information (for example, interval information) indicating the determined interval to the reception section 201.

[0208] The Uu demodulation section 204 performs demodulation processing on the signal input by the signal separation section 202, and outputs the obtained demodulation signal to the Uu error correction decoding section 205.

[0209] The Uu error correction decoding section 205 decodes the demodulation signal input by the Uu demodulation section 204, and outputs the obtained upper layer signaling to the interval setting section 208 and the resource pool setting section 209, and outputs the obtained reception data signal (also referred to as "Uu reception data signal").

[0210] The SL demodulation section 206 performs demodulation processing on the signal input from the signal separation section 202, and outputs the obtained demodulated signal to the SL error correction decoding section 207.

[0211] The SL error correction decoding section 207 decodes the demodulated signal input from the SL demodulation section 206, and performs error determination such as cyclic redundancy check (CRC) on the decoded signal. The SL error correction decoding section 207 outputs the obtained reception data signal (or "sidelink reception data signal") in a case where the decoded signal has no error.

[0212] The gap setting section 208 sets a gap candidate for the signal (for example, TB) transmitted by the terminal 200 on the sidelink, for example, based on the gap candidate information included in the higher layer signaling input from the Uu error correction decoding section 205. The gap setting section 208 outputs the gap candidate information indicating the set gap candidate to the SCI reception section 203 and the SCI generation section 210.

[0213] The resource pool setting section 209 sets a resource pool (for example, time resources and frequency resources) used by the terminal 200 on the sidelink, for example, based on the resource pool setting information included in the higher layer signaling input from the Uu error correction decoding section 205. The set resource pool can include, for example, either or both of resources used for transmission by the terminal 200 and resources used for reception by the terminal 200. The resource pool setting section 209 outputs the resource pool setting information to the SCI generation section 210, the signal separation section 202, and the signal allocation section 215.

[0214] The SCI generation section 210 generates SCI including information related to the set resources, for example, based on the information input from the resource pool setting section 209 (for example, information indicating resources available on the sidelink) and the information input from the gap setting section 208. The SCI generation section 210 can determine, for example, information on a gap (for example, a value of "resource reservation") or frequency resources. The SCI can include, for example, information on the determined resources, information (for example, a transmission source ID) identifying the terminal 200 that is the transmission source, and information (for example, a transmission destination ID) identifying the terminal 200 that is the transmission destination. The SCI generation section 210 outputs the generated SCI to the signal allocation section 215.

[0215] For example, in a case where the mode of the sidelink communication is "mode 2", the terminal 200 generates the SCI at the SCI generation section 210. In addition, for example, in a case where the mode of the sidelink communication is "mode 1", the terminal 200 can generate the SCI from the SCI transmitted by the base station 100 in a case where the base station 100 generates the SCI and transmits the SCI to the terminal 200.

[0216] The Uu error correction coding unit 211 takes the transmitted data signal (UL data signal) of the Uu link as input, performs error correction coding on the transmitted data signal, and outputs the coded signal to the Uu modulation unit 212.

[0217] 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 distribution unit 215.

[0218] The SL error correction coding unit 213 takes the side link transmitted data signal (side link data signal) as input, performs error correction coding on the transmitted data signal, and outputs the coded signal to the SL modulation unit 214.

[0219] 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 distribution unit 215.

[0220] The signal allocation unit 215, for example, allocates the PSCCH signal including the SCI and the PSSCH signal including the sidelink data signal input by the SL modulation unit 214 to sidelink resources based on information input by the resource pool setting unit 209 and the SCI generation unit 210. Additionally, the signal allocation unit 215 allocates the signal input by the Uu modulation unit 212 to resources of the Uu link (e.g., the uplink data channel (PUSCH)). The signal allocation unit 215 then outputs the allocated signals to the transmission unit 216.

[0221] The transmitting unit 216 performs up-conversion and other wireless transmission processing on the signal input from the signal distribution unit 215 and then transmits it.

[0222] Furthermore, in Figure 10 The example shown illustrates a scenario where terminal 200 receives upper-layer signaling including interval candidate information and resource pool setting information, but is not limited to this. For example, at least one of the interval candidate information and resource pool setting information can be set either at the application layer, referred to as "pre-configuration," or pre-configured at the SIM. In this case, terminal 200 may use the pre-configured information without receiving either the interval candidate information or the resource pool setting information. For example, based on the pre-configured resource pool setting information, terminal 200 can identify resources that can be used between base station 100 and terminal 200, as well as resources that can be used in the sidelink, and use information related to these resources in signal separation unit 202 and signal allocation unit 215.

[0223] in addition, Figure 10 As an example, the demodulation unit, error correction decoding unit, error correction coding unit, and modulation unit may have different structural units in the Uu link and the side link, but it is not limited to this and may also have common structural units in the Uu link and the side link.

[0224] [Action of terminal 200]

[0225] Next, an example of the action of the terminal 200 (refer to Figure 10 ) will be described.

[0226] Figure 11 is a flowchart showing an example of the processing of the terminal 200.

[0227] The terminal 200 (for example, a transmitting terminal and a receiving terminal) that performs sidelink transmission and reception sets a parameter on the sidelink (S101). The parameter on the sidelink, for example, can include a time resource (for example, an interval between TBs), a frequency resource, an SL BWP, a resource pool, and a setting of a channel configured to each slot.

[0228] The parameter on the sidelink, for example, can be notified from the transmitting terminal to the receiving terminal by the SCI. Alternatively, for the terminal 200, the parameter on the sidelink, for example, can be specified in a specification (or a standard), can be set in an application layer called "pre-configuration", can be set in advance by a SIM, or can be set by a system information block (SIB) or another RRC upper layer or MAC called "configured".

[0229] The terminal 200 performs sidelink communication (for example, transmission and reception of data) based on the set parameter (S102).

[0230] Next, an example of a setting method of the time resource (for example, an interval between TBs) will be described.

[0231] [Action Example 1-1]

[0232] In Action Example 1-1, for example, a value "X" that notifies an interval between TBs is set to a value obtained by dividing the value of the interval between TBs by W.

[0233] In Action Example 1-1, for example, W can be selected from a plurality of candidates.

[0234] The terminal 200 determines a product (for example, X x W) of X notified by "resource reservation" and the selected W as the interval between TBs.

[0235] Further, for example, the value of the interval between TBs can be notified (or set) to the terminal 200 by an upper layer. In addition, the value of W (for example, a candidate of W) can be specified in a specification (or a standard), can be set in an application layer called "pre-configuration", can be set in a SIM possessed by the terminal 200, can be set in a SIB or another RRC upper layer called "configured", or can be set in MAC.

[0236] In addition, in a case where a plurality of candidates of W is set, information indicating a value of W used (in other words, selected) by the terminal 200 among the plurality of candidates of W can be included in the SCI.

[0237] Alternatively, a plurality of candidates of W can be set in the terminal 200 in advance, for example. In this case, the options of W can be signaled to the terminal 200 by a higher layer such as RRC or MAC. For example, the terminal 200 can select a candidate of W notified by the SCI among the candidates of W included in the options. In addition, in a case where the options of W signaled by the higher layer are one, for example, information for selecting W does not need to be notified by the SCI.

[0238] In Action Example 1-1, by combining X and W, the number of interval candidates can be increased without increasing the number of candidates of X, for example, compared to LTE. Therefore, according to Action Example 1-1, the interval candidates can be dynamically set according to the value of W, for example, and thus data transmission of a plurality of service types can be supported.

[0239] For example, in a case where the value of W is two modes, the terminal 200 can notify another terminal 200 of the SCI including information of one bit indicating one of the two modes. In addition, for example, in a case where the value of W is three or four modes, the terminal 200 can notify another terminal 200 of the SCI including information of two bits indicating one of the three or four modes. Further, the number of bits of information notifying the candidates of W can be three bits or more. In addition, the number of bits of information notified by the SCI can be determined according to the number of candidates of W (in other words, the number of modes).

[0240] Figure 12 An example of a case where the value of W is notified by information of one bit (for example, 0 or 1) included in the SCI.

[0241] Figure 12 In Action Example 1-3, W = 100, which is the same as LTE, and W = 20, which is shorter than LTE, are set as candidates of W. For example, as shown in FIG. 10, W = 100 is notified by bit 0 and W = 20 is notified by bit 1. Further, the candidates of W are not limited to the example (W = 100 or 20) shown in FIG. 10, but can be other values. Figure 12 Figure 12

[0242] Figure 12 In Action Example 1-3, for example, in a case where it is bit 0, 20 ms, 50 ms, or 100X ms (100 times X, X is one of integers from 1 to 10) is set as the interval between TBs. In addition, in a case where it is bit 1, 20 ms, 50 ms, or 100X ms (100 times X, X is one of integers from 1 to 10) is set as the interval between TBs. Figure 12 ​​In this context, for example, when it's bit 1, 4ms, 10ms, or 20Xms (20 times X, where X is an integer from 1 to 10) are set as the interval between TB. Therefore, Figure 12 In, for example, a ratio can be set. Figure 12 More and wider range of intervals.

[0243] Figure 7 This represents an example of a case where the value of W is notified by 2 bits of information contained in the SCI (e.g., one of 00, 01, 10, and 11).

[0244] Figure 13 In this context, W=100 (the same as LTE) and W=5, W=25, and W=40 (shorter than LTE) are set as candidates for W. For example, ... Figure 13 As shown, bit 00 indicates W = 100, bit 01 indicates W = 5, bit 10 indicates W = 25, and bit 11 indicates W = 40. Furthermore, the candidates for W are not limited to... Figure 13 The examples shown (W = 1005, 25, or 40) can also be other values.

[0245] Figure 13 In this context, for example, in the case of bit 00, 20ms, 50ms, or 100Xms (multiples of 100, where X is an integer from 1 to 10) are set as the interval between TB. Additionally, Figure 13 In this context, for example, in the case of bit 0 or 1, 1ms, 2.5ms, or 5Xms (multiples of 5, where X is an integer from 1 to 10) are set as the interval between TB. Additionally, Figure 13 In this context, for example, when there are 10 bits, 5ms, 12.5ms, or 25Xms (25 times X, where X is an integer from 1 to 10) are set as the interval between TBs. Additionally, Figure 13 In the case of bit 11, for example, 8ms, 20ms or 40Xms (40 times X, where X is an integer from 1 to 10) are set as the interval between TB.

[0246] Furthermore, for example, in a side link, without considering a 2.5ms period, in Figure 13 In the bit 01 (W=5) shown, the interval between TBs = 2.5ms can be replaced with 2ms or 3ms. Similarly, for example in a side link, without considering a 12.5ms period, in Figure 13 In bit 10 (W=25) shown, the interval between TBs = 12.5ms can be replaced with 12ms or 13ms.

[0247] Figure 13 In, for example, a ratio can be set. Figure 13 or Figure 7 More and wider range of intervals.

[0248] Thus, in Action Example 1-1, by making the value of W variable, the interval between TBs can be flexibly set, and the period of a plurality of services can be supported.

[0249] Further, as an example, a case where the interval between TBs is calculated by a table shown in Figure 12 and Figure 12 is described, but is not limited thereto. For example, the interval can be calculated based on a bit (e.g., resource reservation) notified by SCI, the value of W, and a table shown in Figure 13 For example, in a case where the table shown in Figure 7 is used, the value of W can be set to a value different from 100. For example, if 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.

[0250] In addition, as shown in Figure 7 and Figure 12 , by setting the value of W to a value of 100 or less (e.g., the same value as LTE), the interval can be set to a value less than 20 ms (e.g., the minimum value in LTE). Further, in Figure 13 and Figure 12 , a case where the value of W is set to 100 or less (e.g., the same value as LTE) is described, but the value of W can also be greater than 100. By this setting of W, for example, the interval can be set to be longer than 1000 ms (e.g., the maximum value in LTE).

[0251] [Action Example 1-2]

[0252] In Action Example 1-2, for example, a plurality of candidates of the association (pattern of X, e.g., represented by a table) of the value "X" that notifies the interval between TBs and information (e.g., resource reservation) that represents X are set.

[0253] For example, the pattern of X notified by SCI can be selected from one or a plurality of candidates (e.g., a plurality of tables).

[0254] The terminal 200, for example, refers to the selected pattern of X, and determines the product (e.g., X × W) of X notified by "resource reservation" and W set in the terminal 200 as the interval between TBs. The value of W can be a fixed value, or can be a variable value as in Action Example 1-1.

[0255] Further, the plurality of candidates of the pattern of X (e.g., a table) can be specified in a specification (or a standard), can be set in an application layer called "pre-configuration", can be set in a SIM possessed by the terminal 200, can be set in a higher layer such as a SIB or other RRC called "configuration", or can be set in MAC.

[0256] In addition, in a case where a plurality of X patterns are set, information indicating a candidate used (in other words, selected) by the terminal 200 among the plurality of candidates can be included in the SCI.

[0257] Alternatively, the X pattern can be set in the terminal 200 in advance, for example. In this case, the options of the X pattern can be signaled to the terminal 200 by a higher layer such as RRC or MAC. For example, the terminal 200 can select a combination notified by the SCI among the combinations included in the options. In addition, in a case where the number of options of the combinations notified by the higher layer is one, for example, information for selecting a combination does not need to be notified by the SCI.

[0258] In Action Example 1-2, by setting a plurality of X patterns, the number of gap candidates can be increased, for example, compared to LTE. Thus, according to Action Example 1-2, the gap candidates can be dynamically set according to the X pattern, for example, and thus data transmission of a plurality of service types can be supported.

[0259] For example, in a case where the X pattern is two patterns, the terminal 200 can notify another terminal 200 of the SCI including information of one bit indicating one of the two patterns. In addition, for example, in a case where the X pattern is three or four patterns, the terminal 200 can notify another terminal 200 of the SCI including information of two bits indicating one of the three or four patterns. Further, the number of information bits for notifying the X pattern can be three or more. In addition, the number of information bits notified by the SCI can be determined according to the number of X patterns.

[0260] Hereinafter, an example of a case where the X pattern is two patterns (in other words, the X pattern is notified by one bit of information) will be described.

[0261] The two X patterns are the pattern shown in Figure 13 and the pattern shown in Figure 7 Further, in Figure 14 and Figure 7 , "W" is a value obtained by dividing the value of the gap by X or a value obtained by multiplying the value of X by the gap, and can be set to 100, for example, as in LTE.

[0262] For example, the X pattern shown in Figure 14 (for example, a combination of X = 0, 0.2, 0.5, and 1 to 10) can be notified by bit 0 included in the SCI, and the X pattern shown in Figure 7 (for example, a combination of X = 0, 0.05, 0.1, 0.2, 0.25, 0.4, 0.5, and 1 to 5) can be notified by bit 1 included in the SCI.

[0263] For example, in the case of bit 0 Figure 14 ), 20 ms, 40 ms, or 100X ms (X times 100, X being an integer of 1 to 10) is set as the interval between TBs. In addition, in the case of bit 1 Figure 7 ), 5 ms, 10 ms, 20 ms, 25 ms, 40 ms, 50 ms, or 100X ms (X times 100, X being an integer of 1 to 5) is set as the interval between TBs. Thus, in Action Example 1-2, a greater and wider range of intervals can be set, for example, compared to the interval setting of LTE Figure 14 ).

[0264] Further, in the above example, the case where the value of W is set to 100 is described, but the value of W can also be a value other than 100, and can be selected from among a plurality of candidates.

[0265] For example, the value of W can be different in each of the patterns of X. For example, if W = 20 is set in Figure 7 , the interval between TBs is set to 1 ms, 2 ms, 4 ms, 5 ms, 8 ms, 10 ms, and 20X ms (X times 20, X being an integer of 1 to 5). The combination of the pattern of X and the value of W can be predetermined, for example, or can be notified to the terminal 200 by other bits (for example, information included in the SCI), as in Action Example 1-1.

[0266] In addition, for example, in at least one of the patterns of X, as shown in Figure 14 , a value smaller than the value of X shown in Figure 14 (for example, X = 0.2) can be included, such as X = 0.1 or 0.05. With this setting of X, a shorter interval can be set, for example, compared to the case of Figure 7 (for example, the case of LTE).

[0267] In addition, for example, as shown in Figure 7 , at least one of the patterns of X can set the granularity of X to be finer than Figure 14 . For example, in Figure 7 , 3 values in the range of X = 0 to 0.5 are set, and in Figure 7 , 7 values in the range of X = 0 to 0.5 are set. With this setting, for example, compared to the case of Figure 14 (for example, the case of LTE), the number of values that can be supported can be increased in the range of the set intervals.

[0268] Thus, in Action Example 1-1 and Action Example 1-2, the transmitting terminal decides information indicating a value "X" obtained by dividing a time interval between TBs by W (for example, resource reservation included in SCI). In addition, the transmitting terminal decides information of one candidate of the above at least one candidate in a case where there are multiple candidates of at least one of the value of W (for example, Action Example 1-1), and the association of X with resource reservation (for example, Action Example 1-2) (for example, bits included in SCI). Based on this, the time interval between TBs is decided. Then, the transmitting terminal transmits the decided information to the receiving terminal.

[0269] The receiving terminal, for example, receives information including X (for example, resource reservation included in SCI). In addition, the receiving terminal receives the value of W (for example, Action Example 1-1), and information of one candidate of the above at least one candidate in a case where there are multiple candidates of at least one of the value of W (for example, Action Example 1-1), and the association of X with resource reservation (for example, Action Example 1-2) (for example, bits included in SCI). Then, the receiving terminal decides the interval between TBs (for example, X × W) based on the received information.

[0270] For example, since W or the pattern of X can be dynamically set by the value of W and the information of the candidate of at least one of the pattern of X, the terminal 200 can dynamically set the interval candidate, and can support data transmission of multiple service types.

[0271] Further, in Action Example 1-1 and Action Example 1-2, the notification method of "resource reservation" that notifies the interval between TBs is described, and Action Example 1-1 and Action Example 1-2 can also be applied to the notification method of "time interval between initial transmission and retransmission".

[0272] [Action Example 1-3]

[0273] In Action Example 1-3, the interval between TBs is set based on either one of the time interval (in other words, interval) notified by "resource reservation" and the time interval (in other words, gap) notified by "time interval between initial transmission and retransmission".

[0274] For example, the terminal 200 can notify other terminals 200 of SCI including information indicating which of the time intervals of "resource reservation" and "time interval between initial transmission and retransmission" is used when setting (in other words, notifying) the interval between TBs.

[0275] According to Action Example 1-3, similarly to Action Example 1-1 and Action Example 1-2, the candidate of the interval can be dynamically changed, and data transmission of multiple service types can be supported.

[0276] For example, the time interval (e.g., interval or gap) for the interval setting between TBs can be notified by 1 bit of information (bit 0 or bit 1, for example, an additional bit) included in the SCI. For example, in a case where bit 0 is notified, the terminal 200 can set the interval between TBs based on the time interval (e.g., interval) notified by the "resource reservation". In addition, for example, in a case where bit 1 is notified, the terminal 200 can set the interval between TBs based on the time interval (e.g., gap) notified by the "time interval between initial transmission and retransmission".

[0277] In Action Example 1-3, the set interval can be applied to the interval between the initial transmission of TBs, or can be applied to the interval between the initial transmission of TBs and the retransmission of TBs. The terminal 200 can distinguish the initial transmission and the retransmission, for example, based on the "retransmission index".

[0278] For example, the terminal 200 can set the time interval (e.g., interval) notified by the "resource reservation" as the interval between TBs in a case where the time period of the service is long (e.g., in a case where it is equal to or greater than a threshold value). In addition, in a case where the time period of the service is short (e.g., in a case where it is less than the threshold value), the terminal 200 can set the time interval shorter than the time interval notified by the resource reservation, that is, the time interval (e.g., gap) notified by the "time interval between initial transmission and retransmission" as the interval between TBs.

[0279] In Action Example 1-3, for example, since a plurality of candidates of W as in Action Example 1-1 or a pattern of X as in Action Example 1-2 is not set, signaling related to the setting of the time resource can be reduced.

[0280] In addition, as a variation of Action Example 1-3, for example, as illustrated in FIG. 13, in a case where bit 0 is notified, the terminal 200 can set the interval between the initial transmission of TBs as the time interval notified by the "resource reservation" and set the gap between the initial transmission and the retransmission as the interval that is the time interval notified by the "resource reservation". Figure 7

[0281] [Action Example 1-4]

[0282] In Action Example 1-4, the interval between TBs is set based on the time interval (in other words, the interval) notified by the "resource reservation".

[0283] For example, the terminal 200 can notify the other terminal 200 of the SCI including information indicating a value decided by the decision method of which time interval between the "resource reservation" standardized in LTE-V2X and the "time interval between initial transmission and retransmission" is decided, at the time of setting (in other words, notifying) the interval between TBs.

[0284] ​According to Action Example 1-4, like Action Example 1-1, Action Example 1-2, and Action Example 2-3, the candidate of the interval can be dynamically changed, and the data transmission of a plurality of service types can be supported. In addition, the LTE-V2X specification can be maximally utilized.

[0285] For example, the time interval (e.g., interval or gap) for the interval setting between TBs can be notified by 1-bit information (bit 0 or bit 1, for example, an additional bit) included in the SCI. For example, in a case where bit 0 is notified, the terminal 200 can set the time interval (e.g., interval) notified by "resource reservation" in the same order as "resource reservation" in the LTE-V2X specification. In addition, for example, in a case where bit 1 is notified, the terminal 200 can set the time interval (e.g., interval) notified by "resource reservation" in the same order as "time interval between initial transmission and retransmission" in the LTE-V2X specification.

[0286] In Action Example 1-4, for example, the set interval can be applied to the interval between the initial transmission of the TB, and can be applied to the interval between the initial transmission of the TB and the retransmission of the TB. The terminal 200 can distinguish the initial transmission and the retransmission, for example, based on the "retransmission index".

[0287] For example, the terminal 200 can set the time interval (e.g., interval) notified by "resource reservation" in the same order as "resource reservation" in the LTE-V2X specification in a case where the time period of the service is long (e.g., in a case where it is equal to or more than a threshold value). In addition, the terminal 200 can set the time interval (e.g., interval) notified by "resource reservation" in the same order as "time interval between initial transmission and retransmission" in the LTE-V2X specification in a case where the time period of the service is short (e.g., in a case where it is less than a threshold value).

[0288] In Action Example 1-4, for example, since a plurality of candidates of W of Action Example 1-1 or a plurality of patterns of X of Action Example 1-2 are not set, signaling related to the setting of the time resource can be reduced.

[0289] Further, the information indicating the determination method of the time interval for the interval setting between TBs is not limited to the case where it is explicitly notified by information (e.g., 1-bit information) included in the SCI, and for example, it can be implicitly notified by information defined in another use.

[0290] The above describes Action Examples 1-1 to 1-4, respectively.

[0291] According to the present embodiment, the terminal 200 can dynamically set the interval between TBs from among the candidates of the plurality of time intervals, for example, even in a case where there are more types of services than in LTE, like in NR. Thus, according to the present 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).

[0292] (Embodiment 2)

[0293] In Embodiment 1 (e.g., Action Example 1-1 and Action Example 1-2), a method of explicitly notifying the value of W or the pattern of X (e.g., the table shown in FIG. 13) by bits included in SCI is described. In contrast, in the present embodiment, a method of implicitly notifying the value of W or the pattern of X will be described. Figure 6 Figure 7

[0294] According to the present embodiment, it is possible to increase the number of intervals that can be set without increasing the number of bits of SCI.

[0295] The base station and the terminal of the present embodiment have the same basic structure as the base station 100 and the terminal 200 of Embodiment 1.

[0296] Hereinafter, an example of a method of setting time resources (e.g., intervals between TBs) of the present embodiment will be described.

[0297] (Action Example 2-1)

[0298] In Action Example 2-1, the notification of the interval between TBs uses "priority indication" or "QoS indication" included in SCI. Further, in LTE, it is called "priority indication", but in the SCI of NR, it can also be called a different name (e.g., "QoS indication").

[0299] It is being studied to include information such as priority, latency, or reliability in the priority indication or the QoS indication, for example. Based on the priority indication or the QoS indication, it is being studied to control, for example, resource allocation, congestion control between terminals, resolution of in-device coexistence issues in a case where a plurality of data is generated within a terminal, or power control.

[0300] ​​In Action Example 2-1, the terminal 200 can determine the value of W or the pattern of X, for example, based on the priority indication or the QoS indication. In other words, information included in the priority indication or the QoS indication is associated with a candidate of the value of W or the pattern of X.

[0301] For example, the terminal 200 specifies an amount of delay (in other words, an amount of desired delay) required by the terminal 200 based on the priority indication or the QoS indication.

[0302] Then, the terminal 200 sets the interval between TBs, for example, based on W = 20 in Action Example 1-1 or W = 100 in Action Example 1-2, in a case where the specified amount of delay is short (for example, in a case where it is less than a threshold value). Figure 14 In addition, the terminal 200 can set the interval between TBs based on W = 20 in Action Example 1-1 or W = 100 in Action Example 1-2, in a case where the specified amount of delay is long (for example, in a case where it is greater than a threshold value). Figure 14

[0303] For example, by applying the pattern of X shown in W = 20 or Figure 7 , the interval between TBs can be set shorter than in the case of W = 100 or Figure 14 , and thus it is easy to satisfy the amount of delay required by the terminal 200.

[0304] The mapping of the priority indication or the QoS indication and the value of W (for example, W = 20 or 100) or the pattern of X (for example, the table shown in Figure 7 or Figure 7 ) can be specified in a specification (or a specification), can be set in a SIM, can be set in an application layer called "pre-configuration", or can be set in an upper layer such as an SIB or other RRC or a MAC called "configuration".

[0305] According to Action Example 2-1, the terminal 200 can notify the interval between TBs without using a new bit. In addition, for example, the terminal 200 can set an interval that is appropriate for a parameter (for example, an amount of required delay) corresponding to a value set in LTE.

[0306] [Action Example 2-2]

[0307] In Action Example 2-2, the notification of the interval between TBs uses a redundancy version (Redundancy Version: RV) included in SCI.

[0308] ​In LTE, there is no notification of the RV of the SCI. On the other hand, in NR, the same as in the downlink control information (DCI: Downlink control indication), in the SCI, the notification of the retransmission control of the RV and the new data indicator (NDI) is also studied.

[0309] For example, as shown in FIG. 6, in the circular buffer, a bit string of systematic bits plus parity bits of a transport block size (TBS: TB size) determined by the indication of the MCS is stored. In the example shown in FIG. 6, the parity bits of about 2 times the length of the systematic bits are added. In addition, in the example shown in FIG. 6, the circular buffer is divided into 4. Figure 14 Figure 15 Figure 15

[0310] The "RV" is a signal that notifies the bit position at which the data transmission in the circular buffer is started (for example, one of RV0, RV1, RV2, and RV3). For example, as shown in FIG. 7, the RV0 usually starts transmitting bits from the bit position near the head of the systematic bits (for example, the bit position shifted by a number of bits from the head). In addition, in one transmission, the transmittable bits are determined from the start position of the circular buffer by the number of transmittable bits. Figure 15

[0311] For example, in the case where the RV0 is notified, since the transmitted bits include more systematic bits than the other RVs, the RV0 is easily set (in other words, selected) at the initial transmission.

[0312] In addition, in the retransmission, for example, in the case where the terminal 200 can receive the signal of the initial transmission, if bits that do not repeat the initial transmission are transmitted, it becomes a retransmission method called "incremental redundancy", and the reception quality can be improved. Therefore, in the retransmission, the RV1, RV2, or RV3 that does not repeat the initial transmission (for example, RV0) is easily selected. In addition, for example, as shown in FIG. 8, compared to the RV1 and RV3 adjacent to the RV0, the RV2 repeats the bit string of the RV0 less. In addition, for example, in one transmission, the more the number of transmittable bits (in other words, the longer the bit string), the more the systematic bits that the RV3 can include. Figure 15

[0313] In consideration of such characteristics of the RV, for example, in one transmission, the more the number of transmittable bits, the more the bit string corresponding to the RV3 or RV1 is easily included in the bit string corresponding to the RV0 or RV2. In other words, for example, in one transmission, the more the number of transmittable bits, the more the bit string corresponding to the RV0 or RV2 is easily included in the bit string corresponding to the RV1 or RV3. Figure 15 Figure 15 ​​​​​​In this case, the terminal 200 (e.g., a receiving terminal) can receive the bits included in the bit string corresponding to RV3 or RV1 by receiving the bit string corresponding to RV0 or RV2.

[0314] Therefore, it is expected that the reception characteristics in the terminal 200 are not easily deteriorated even if a part (e.g., 1) of the plurality of RVs is used for the notification of W in Action Example 1-1 or the notification of the pattern (e.g., table) of X in Action Example 1-2.

[0315] In this regard, in Action Example 2-2, the terminal 200 can determine the value of W or the pattern of X based on the RV, for example. In other words, the RV is associated with the value of W or the pattern of X.

[0316] As an example 1 of Action Example 2-2, the terminal 200 can use the bits used in the notification of RV3 to indicate the intervals between the following notifications TB. Also, hereinafter, as an example, RV0 is notified by the bit 00, RV1 is notified by the bit 01, RV2 is notified by the bit 10, and RV3 is notified by the bit 11.

[0317] In example 1, the bit 11 can indicate the intervals of the values different from the case of the other bits (e.g., bit 00, bit 01, and bit 10) and RV0 instead of RV3. For example, the bit 11 can be associated with a shorter interval (e.g., W = 20 or the pattern of X = 20) than the bit 00, 01, and 10 (e.g., W = 100 or the pattern of X = 100), for example. Figure 15 Figure 7 In example 2, the bit 11 can indicate the intervals of the values different from the case of the other bits (e.g., bit 00, bit 01, and bit 10) and RV0 instead of RV3. For example, the bit 11 can be associated with a longer interval (e.g., W = 100 or the pattern of X = 100) than the bit 00, 01, and 10 (e.g., W = 20 or the pattern of X = 20).

[0318] 00: RV0 and W = 100 (or the pattern of X = 100) Figure 14 01: RV1 and W = 100 (or the pattern of X = 100)

[0319] Figure 7 10: RV2 and W = 100 (or the pattern of X = 100)

[0320] 11: RV0 and W = 20 (or the pattern of X = 20) Figure 7

[0321] For example, in the case of a longer interval (e.g., W = 100 or the pattern of X = 100 is applied), one of RV0, RV1, and RV2 can be set, and in the case of a shorter interval (e.g., W = 20 or the pattern of X = 20 is applied), one of RV0, RV1, and RV2 can be set. Figure 7

[0322] For example, in the case of a longer interval (e.g., W = 100 or the pattern of X = 100 is applied), one of RV0, RV1, and RV2 can be set, and in the case of a shorter interval (e.g., W = 20 or the pattern of X = 20 is applied), one of RV0, RV1, and RV2 can be set. Figure 14 Figure 7 ​​​​​RV0. However, it is conceivable that the shorter the interval, the shorter the expected delay for the data packet, for example. Thus, it is conceivable that the shorter the interval, the more redundantly the signal at the time of the initial transmission is transmitted, so that the more cases in which the receiving terminal can receive the signal in the initial transmission (in other words, the more cases of successful reception). Therefore, as described above, even if the RV settable in the case of a short interval is one of RV0, the retransmission efficiency is not easily degraded.

[0323] Further, in Example 1, a case in which the bit 11 corresponding to RV3 is used for notification of an interval different from bits corresponding to other RVs is described, but notification of an interval different from bits corresponding to other RVs (for example, RV1) can also use bits corresponding to other RVs different from RV3. In addition, in Example 1, a case in which the interval different from the other is shorter than the other interval is described, but can also be longer than the other interval.

[0324] Further, as Example 2 of Action Example 2-2, 2 of the plurality of RVs (for example, RV1 and RV3) can be used for notification of W in Action Example 1-1 or notification of the pattern (for example, the table) of X in Action Example 1-2. In the case of Example 2, it is also possible to set RV0 or RV2 without setting RV1 and RV3 as shown below.

[0325] 00: RV0 and W = 100 (or Figure 14 )

[0326] 01: RV0 and W = 20 (or Figure 7 )

[0327] 10: RV2 and W = 100 (or Figure 14 )

[0328] 11: RV2 and W = 20 (or Figure 7 )

[0329] Thus, even in the case of notifying different intervals instead of notifying 2 states of the RV (for example, RV1 and RV3), in each of the different intervals (for example, W = 20 and W = 100 each), the RV can be changed at the time of retransmission.

[0330] [Action Example 2-3]

[0331] In Action Example 2-3, notification of the interval between TBs uses "RV" and "retransmission index" included in SCI.

[0332] The retransmission index is information that notifies which of the initial transmission and the retransmission.

[0333] In Action Example 2-3, the terminal 200 can determine the value of W or the pattern of X, for example, based on the RV and the retransmission index (e.g., information indicating data retransmission). In other words, the combination of the RV and the retransmission index (transmission type) is associated with a candidate of the value of W or the pattern of X.

[0334] For example, by limiting the type of RV that can be used according to the initial transmission and the retransmission, the pattern of W in Action Example 1-1 or X in Action Example 1-2 is notified instead.

[0335] For example, in a 3-bit bit string obtained by combining a 2-bit RV and a 1-bit retransmission index, the first 2 bits are used for the RV and the last 1 bit is used for the retransmission index. Also, for example, initial transmission is indicated in the case where the retransmission index (e.g., the 3rd bit in 3 bits) is 0 and retransmission is indicated in the case where it is 1. Also, for example, the RV is set to one of RV0 and RV3 at initial transmission and to one of RV2 and RV1 at retransmission.

[0336] In this case, the RV, interval, and transmission type (initial transmission or retransmission) can be set as shown below for a 3-bit bit string (e.g., 000 to 111).

[0337] 000: RV0, W = 100 (or Figure 14 ) and initial transmission

[0338] 001: RV2, W = 100 (or Figure 7 ) and retransmission

[0339] 010: RV0, W = 20 (or Figure 7 ) and initial transmission

[0340] 011: RV2, W = 20 (or Figure 14 ) and retransmission

[0341] 100: RV3, W = 100 (or Figure 14 ) and initial transmission

[0342] 101: RV1, W = 100 (or Figure 7 ) and retransmission

[0343] 110: RV3, W = 20 (or Figure 7 ) and initial transmission

[0344] 111: RV1, W = 20 (or Figure 14 ) and retransmission

[0345] For example, at the time of initial transmission, RV0 or RV3 that can include more systematic bits than RV1 and RV2 is selected, and at the time of retransmission, RV1 or RV2 that can include more parity bits not included in the initial transmission is selected.

[0346] According to Action Example 2-3, the number of RVs that can be selected in the initial transmission and the retransmission is reduced, but since RVs suitable for the initial transmission and the retransmission, respectively, are included in the options, it is possible to suppress degradation of reception quality in the terminal 200.

[0347] [Action Example 2-4]

[0348] In Action Example 2-4, the notification of the interval between the TBs uses the HARQ process number (or can be referred to as "HARQ process ID") included in the SCI.

[0349] In NR, support for multiple processes is being studied, and the HARQ process ID can be notified by the SCI.

[0350] In Action Example 2-4, the terminal 200 can determine the value of W or the pattern of X, for example, on the basis of the HARQ process ID. In other words, the HARQ process ID is associated with the candidate of the value of W or the pattern of X.

[0351] For example, the value of W in Action Example 1-1 or the pattern of X in Action Example 1-2 (for example, a table) can be set for each HARQ process.

[0352] Further, the setting method for each HARQ process can be specified in the specification (or the standard), can be set in advance in the SIM, can be set in the application layer called "pre-configuration", or can be set in the SIB or other RRC upper layer or the MAC called "configuration".

[0353] For example, the longer the interval, the fewer the number of HARQ processes allocated to the interval. In other words, the shorter the interval, the more the number of HARQ processes allocated to the interval.

[0354] In this regard, for example, W = 100 in Action Example 1-1 or the combination of the candidates of X shown in Action Example 1-2 can be set for HARQ process #0. Figure 14 The combination of the candidates of X shown in Action Example 1-2 can be set for other HARQ process IDs. Figure 7 The combination of the candidates of X shown in Action Example 1-2 can be set for other HARQ process IDs.

[0355] Further, the association of the HARQ process ID with the candidate of W or the pattern of X described above is an example and is not limited. For example, the number of HARQ process IDs associated with W = 100 in Action Example 1-1 or the pattern of X shown in Action Example 1-2 can be plural. Figure 14 Further, the association of the HARQ process ID with the candidate of W or the pattern of X described above is an example and is not limited. For example, the number of HARQ process IDs associated with W = 100 in Action Example 1-1 or the pattern of X shown in Action Example 1-2 can be plural.

[0356] The terminal 200 can obtain the parameter for setting the interval between TBs, for example, based on the HARQ process ID included in the SCI.

[0357] The above describes the action example 2-1 to the action example 2-4.

[0358] Further, any two or more of the action example 2-1 and the action example 2-4 can be combined.

[0359] In the present embodiment, the interval between TBs is implicitly notified by information defined in other use. Therefore, according to the present embodiment, for example, in sidelink, in order to notify the interval between TBs, for example, it is not necessary to add new information to the parameter defined in LTE, and thus it is possible to reduce the overhead of signaling.

[0360] (Embodiment 3)

[0361] In the SCI of LTE, for example, as shown in Figure 7 , the transmission timing is specified based on two time intervals, the interval between TBs (for example, corresponding to "resource reservation"), and the gap between the initial transmission and the retransmission (for example, "time gap between initial transmission and retransmission").

[0362] In addition, in LTE, for example, the TB of the current initial transmission (for example, the initial transmission TB#1 of Figure 6 ) is given a transmission opportunity after the interval indicated by "resource reservation" to the TB of the next initial transmission (for example, the initial transmission TB#2 of Figure 6 ). Therefore, for example, before the transmission opportunity of the next TB (for example, TB#2 of Figure 6 ), the retransmission timing can be set for the current TB (for example, TB#1 of Figure 6 ).

[0363] However, the shorter the interval between TBs notified by "resource reservation", for example, the higher the possibility that the transmission timing of the next TB (for example, the initial transmission timing) overlaps with the transmission timing of the current TB (for example, the retransmission timing).

[0364] In addition, in NR, it is also possible to notify the NDI from the SCI, and to notify the transmission of the multiple retransmissions and the new TB (for example, the next TB) according to whether the NDI is triggered.

[0365] In addition, in NR, the feedback of HARQ using PSFCH is also being studied. In the case where ACK (in other words, no error) is confirmed by the feedback using PSFCH, for example, the transmission terminal does not need to secure the resource for retransmission. Therefore, in the feedback using PSFCH, for example, it becomes possible to use the resource for initial transmission when the retransmission is generated.

[0366] The basic structure of the base station and the terminal of this embodiment is common to the base station 100 and the terminal 200 of Embodiment 1.

[0367] Next, an example of the operation of the terminal 200 of this embodiment will be described.

[0368] [Example of Operation 3-1]

[0369] In the example of operation 3-1, the interval between the TBs (in other words, the time interval) set in the terminal 200, for example, is set to the time interval between the TBs adjacent in the time domain among the TBs communicated by the terminal 200.

[0370] For example, the value of W in the example of operation 1-1 or the pattern (for example, the table) of X in the example of operation 1-2 is set in the terminal 200. The terminal 200 can determine the interval between the TBs, for example, based on the set value.

[0371] Further, the value of W or the combination of the candidates of X can be specified in the specification (or the standard), can be set in the SIM, can be set in the application layer called “pre-configuration”, or can be set in the SIB or the upper layer or the MAC such as RRC or the like called “configuration”.

[0372] In the example of operation 3-1, in the case where the interval set in the terminal 200 is shorter than the threshold value (for example, the interval specified in LTE), for example, the “time interval between the initial transmission and the retransmission” and the “retransmission index” can not be included in the SCI.

[0373] For example, in the case where the interval set in the terminal 200 is shorter than the threshold value, the retransmission can be performed according to the transmission timing based on the interval between the TBs (for example, the time interval corresponding to the resource reservation). In other words, the timing of the retransmission can be set, for example, according to the notification based on the “resource reservation” and the interval between the TBs set by the value of W in the example of operation 1-1 (or the pattern of X in the example of operation 1-2).

[0374] Figure 6 An example of the resource allocation in the example of operation 3-1 is shown.

[0375] In Figure 16 , the interval between the TBs (the time interval) is set to 4 slots by the SCI transmitted in slot #0, for example. Therefore, as shown in Figure 16 , the interval of the time interval of the TBs adjacent as the transmission timing is the same (for example, 4 slots) regardless of the type of the TB (for example, the HARQ process) and the type of the transmission (for example, the initial transmission and the retransmission), for example.

[0376] For example, in Figure 16In the middle, the data of the HARQ process #0 (for example, indicated as "HARQ#0") is allocated in the slot #0, and the data of the HARQ process #1 (for example, indicated as "HARQ#1") is allocated in the slot #4.

[0377] In addition, in Figure 16 In the slot #8, the data of the HARQ process #0 is allocated with the same NDI = 0 as the initial transmission (slot #0). Therefore, the terminal 200 (for example, the receiving terminal) judges the data transmission of the HARQ process #0 in the slot #8 as a retransmission. In addition, in Figure 16 In the slot #12, the data of the HARQ process #1 is allocated with the different NDI = 1 from the initial transmission (slot #4). Therefore, the terminal 200 (for example, the receiving terminal) judges the data transmission of the HARQ process #1 in the slot #12 as an initial transmission. Similarly, in Figure 16 In the slot #16, the data of the HARQ process #0 is allocated with the different NDI = 1 from the retransmission (slot #8). Therefore, the terminal 200 (for example, the receiving terminal) judges the data transmission of the HARQ process #0 in the slot #16 as an initial transmission.

[0378] Further, in Figure 16 In the middle, the data of the HARQ process #0 (for example, indicated as "HARQ#0") is allocated in the slot #0, and the data of the HARQ process #1 (for example, indicated as "HARQ#1") is allocated in the slot #4.

[0379] According to the Action Example 3-1, since the data is allocated to the time resource (in other words, the interval) set based on the "resource reservation" regardless of the initial transmission or the retransmission, it is not necessary to additionally secure the resource for the retransmission.

[0380] In addition, according to the Action Example 3-1, for example, the "time interval between the initial transmission and the retransmission" and the "retransmission index" do not need to be included in the SCI. Therefore, for example, the bits for the "time interval between the initial transmission and the retransmission" and the "retransmission index" can be deleted from the SCI to shorten the length of the SCI. Alternatively, a part of the bits or all of the bits of the bits not used for the "time interval between the initial transmission and the retransmission" and the "retransmission index" can be set to a fixed value for error detection. By these settings of the SCI, it is possible to improve the reception quality of the SCI.

[0381] In addition, a part of the bits not used for the "time interval between the initial transmission and the retransmission" and the "retransmission index" can be set to, for example, the bits that notify the value of W in the Action Example 1-1 or the pattern of X in the Action Example 1-2. For example, in the Action Example 1-1, the notification of W can use 2 bits (4 patterns), and the terminal 200 can select one of W = 5, 10, 15, and 20.

[0382] Additionally, bits not used for the "time interval between initial transmission and retransmission" and the "retransmission index" can be used to notify the NDI or HARQ ID area.

[0383] Additionally, in action example 3-1, for example, Figure 16 As shown, the time interval between TBs is set regardless of the TB type and the transmission type. Therefore, according to Action Example 3-1, even if the time interval between TBs is short (e.g., less than a threshold), it is possible to prevent the transmission timing from overlapping between the current TB and the next TB.

[0384] [Action Example 3-2]

[0385] In action example 3-2, for example, Figure 16 As shown, the interval (time interval) between TBs indicated by the resource reservation is set as the time interval between the retransmission timing of TB#N and the initial transmission timing of TB#N+1.

[0386] For example in Figure 17 In this context, the time interval (e.g., equivalent to 98 time slots) between time slot #2, which serves as the retransmission opportunity for TB#1, and time slot #100, which serves as the initial transmission opportunity for TB#2, is indicated to terminal 200 via resource reservation. Similarly, in Figure 17 In this process, the time interval (e.g., equivalent to 98 time slots) between time slot #102, which serves as the retransmission opportunity for TB#2, and time slot #200, which serves as the initial transmission opportunity for TB#3, is indicated to terminal 200 through resource reservation.

[0387] In Action Example 3-2, the time interval between the initial transmission timing of TB#N and the initial transmission timing of TB#N+1 can be set, for example, to the value obtained by adding the interval of the resource reservation indication to the time interval indicated by the "time interval between initial transmission and retransmission" (in other words, the gap). For example, in Figure 17 In this context, the time interval between the initial transmission timing of TB#N and the initial transmission timing of TB#N+1 is set to the sum of the interval of the resource reservation indication (e.g., 98 time slots) and the interval maintained by the "time interval between initial transmission and retransmission" (e.g., 2 time slots), which is 100 time slots.

[0388] According to Action Example 3-2, for example, based on the interval settings of the "resource reservation" instruction and the "interval between initial transmission and retransmission" instruction, multiple intervals can be notified, which can improve the flexibility of resource allocation.

[0389] For example, terminal 200 can set the interval indicated by "resource reservation" to be longer than "time interval between initial transmission and retransmission", and notify the interval of multiple intervals.

[0390] In addition, in Action Example 3-2, as illustrated in FIG. 12, for example, the transmission of the next TB#N+1 is allocated after the initial transmission and the retransmission of the TB#N. In other words, in Action Example 3-2, the transmission of the next TB#N+1 is not allocated between the initial transmission and the retransmission of the TB#N. Thus, according to Action Example 3-2, for example, even in a case where the interval between the TBs is short (for example, in a case where the interval is less than a threshold), it is possible to prevent the transmission timing from overlapping between the current TB and the next TB. Figure 17

[0391] In addition, in Action Example 3-2, as illustrated in FIG. 12, for example, the interval between the retransmission timing of the TB#N and the initial transmission timing of the TB#N+1 transmitted after the TB#N is set by the resource reservation. Thus, in Action Example 3-2, for example, compared to LTE (Release 14), the interval notified by the resource reservation is variable and short. Thus, in Action Example 3-2, compared to LTE, it is possible to reduce the information (for example, the pattern of the interval) notified by the resource reservation. Figure 17 Figure 17

[0392] The Action Examples 3-1 and 3-2 have been described above.

[0393] The Action Examples 3-1 and 3-2 have been described above.

[0394] In Action Examples 1 to 3, the method of setting the time resources has been described. In contrast, in the following Action Examples 4 to 7, the method of setting the frequency resources is described.

[0395] (Action Example 4)

[0396] In V2X, for example, the resources reserved by the transmitting terminal (for example, Tx UE) are notified to the receiving terminal (Rx UE) by SCI. In LTE, for example, the frequency resources (for example, subchannels) are allocated by the “resource frequency position of initial transmission and retransmission”.

[0397] ​​​A subchannel is, for example, a resource including a plurality of resource blocks (for example, physical resource blocks (PRBs)). The allocation of a subchannel is, for example, also a contiguous subchannel. Sidelink communication is, for example, communication based on discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-Spread OFDM) called "single carrier communication", and thus an increase in a peak-to-average power ratio (PAPR) is suppressed by the allocation of a contiguous resource (for example, a subchannel) in the frequency domain.

[0398] In LTE V2X, a plurality of time resources (for example, slots) can be reserved, as illustrated in FIG. 1, for example. At this time, in the frequency domain in the plurality of time resources reserved, the same frequency resource of a certain interval (for example, subchannels #1 and #2 in FIG. 1) can be reserved, for example. Figure 6 Figure 6

[0399] As described above, the notification of the reserved resource is received not only by the receiving terminal but also by another terminal different from the receiving terminal. Therefore, the other terminal also grasps the reserved resource in addition to the receiving terminal to which the resource is allocated. The other terminal can reduce the probability of resource collision by avoiding scheduling of the resource reserved by the transmitting terminal, for example, by monitoring (or sensing) another SCI different from the SCI for the other terminal. Therefore, each terminal can easily avoid resource collision in the allocation of a time resource subsequent to the time resource in which the SCI is received, for example, if the initial SCI is correctly received.

[0400] In addition, in LTE V2X, the SCI (or PSCCH) as a control signal and the PSSCH as a data signal are allocated to the same slot, for example.

[0401] In contrast to this, in NR V2X, a method called "single PSCCH" is being studied, for example, in order to avoid collision of the SCI at the time of initial transmission. In the single PSCCH, the PSCCH transmitting the SCI is transmitted (in other words, the PSSCH is not transmitted) at the time of initial transmission, and the PSSCH transmitting data is transmitted after the next reserved time resource of the initial transmission, for example.

[0402] In addition, in NR V2X, a method called "single subchannel of PSCCH+PSSCH" is also being studied, for example. In the single subchannel of PSCCH+PSSCH, the PSCCH transmitting the SCI and the PSSCH of one subchannel are transmitted at the time of initial transmission, for example.​​

[0403] Figure 6 (a) represents a single example of a PSCCH. Figure 18 (b) represents an example of a single channel of PSCCH+PSSCH.

[0404] exist Figure 18 In (a), for example, a PSCCH is sent in slot #0 where resource reservation begins, but a PSSCH is not sent. Figure 18 In the example shown in (a), two transmitting terminals transmit PSCCHs in sub-channels #0 and #2 of time slot #0, respectively. For example, by transmitting the PSCCH in sub-channel #0 of time slot #0, sub-channels #0, #1, and #2 of time slot #2 are reserved; and by transmitting the PSCCH in sub-channel #2 of time slot #0, sub-channels #1 and #2 of time slot #3 are reserved. Based on individual PSCCHs, other terminals that have received (or monitored) the PSCCH of time slot #0 can identify sub-channels #0, #1, and #2 of time slot #2 and sub-channels #1 and #2 of time slot #3 as reserved resources.

[0405] exist Figure 18 In (b), for example, with Figure 18 Similarly, in slot #0 where resource reservation begins, a PSCCH is sent to reserve resources for subsequent slots (e.g., slot #2 or slot #3). Additionally, in Figure 18 In (b), PSCCH is sent in time slot #0 and PSSCH is also sent in one sub-channel.

[0406] By using a single sub-channel of PSCCH or SCCH+PSSCH, the initial PSCCH is transmitted, for example, in one sub-channel, thus increasing the likelihood that each terminal can receive the PSCCH without conflict. For example, even if the frequency resources of PSSCH overlap, as long as the frequency resources of PSCCH do not overlap, each terminal can receive the PSCCH without conflict, and other terminals can take control of the resources reserved by the sending terminal.

[0407] In addition, the single channel of PSCCH+PSSCH also transmits PSSCH in time slot #0, which improves the efficiency of resource utilization compared to PSCCH alone.

[0408] Furthermore, in Figure 18 In this context, a reserved resource may be represented by a time resource with a time interval specified by "interval between initial transmission and retransmission" (e.g., a gap). However, a reserved resource may be a time resource with a longer interval (e.g., a time resource with an interval specified by "resource reservation") compared to the time interval specified by "interval between initial transmission and retransmission".

[0409] However, research on methods for notifying frequency resources when implementing a single sub-channel of PSCCH or PSSCH+PSSCH is insufficient.

[0410] For example, if the allocation of 0 (in other words, no frequency resources are allocated) or 1 sub-channel is notified in order to notify the allocation of frequency resources for a single sub-channel based on a single PSCCH or PSSCH+PSSCH, the terminal may sometimes be unable to reserve frequency resources for use in subsequent time slots.

[0411] Furthermore, in V2X, terminals may have concerns such as being unable to receive signals from other terminals during signal transmission (also known as the "half-duplex issue"). Therefore, depending on the terminal's condition, there may be terminals that are unable to receive the PSCCH, including the initial SCI. Thus, there is room for research, for example, on methods for terminals to specify resources to be reserved through successfully received PSCCHs even when they are unable to receive the initial or multiple PSCCHs.

[0412] In this regard, in one embodiment of the present disclosure, a method for more flexibly configuring frequency resources (e.g., sub-channels) in sidelink communication is described.

[0413] [Overview of Communication Systems]

[0414] The communication system in this embodiment includes a base station 300 and a terminal 400.

[0415] Figure 18 This is a block diagram illustrating a partial structural example of the terminal 400 according to this embodiment. Figure 19 In the terminal 400 shown, the control unit (e.g., equivalent to a control circuit) determines first information indicating a reserved frequency resource and second information indicating a configuration method for a channel (e.g., PSSCH) for the frequency resource. Additionally, the communication unit (e.g., equivalent to a communication circuit) transmits the first and second information.

[0416] In addition, Figure 19 In the terminal 400 shown, the communication unit (e.g., equivalent to a communication circuit) receives first information indicating a reserved frequency resource and second information indicating a configuration method for a channel (e.g., PSSCH) for the frequency resource. The control unit (e.g., equivalent to a control circuit) determines the channel configuration based on the first and second information.

[0417] [Base station structure]

[0418] Figure 19 This is a block diagram illustrating a structural example of the base station 300 according to this embodiment. Figure 20In the present embodiment, the base station 300 includes a frequency resource size setting section 301, a resource pool setting section 302, an error correction encoding section 303, a modulation section 304, a signal allocation section 305, a transmission section 306, a reception section 307, a signal separation section 308, a demodulation section 309, and an error correction decoding section 310.

[0419] The frequency resource size setting section 301 determines, for example, a candidate of the size of the frequency resource in a case where a signal is transmitted using a part of the frequency resource allocated to the terminal 400. For example, the frequency resource size setting section 301 can determine a candidate of the size of the frequency resource for each resource pool allocated to the terminal 400. The resource pool setting section 301 outputs signaling of an upper layer including resource pool setting information to the error correction encoding section 303.

[0420] The frequency resource size can be, for example, the number of subchannels, or information indicating a ratio with respect to all the frequency resources allocated to the terminal 400 (an example will be described later).

[0421] The resource pool setting section 302 sets a resource pool used in sidelink for each terminal 400. For example, the resource pool setting section 302 can generate information on the time resource and the frequency resource of the resource pool (hereinafter referred to as "resource pool setting information"). The resource pool setting section 302 outputs signaling of an upper layer including the resource pool setting information to the error correction encoding section 303. In addition, the resource pool setting section 302 outputs the resource pool setting information to the signal allocation section 305 and the signal separation section 308.

[0422] The error correction encoding section 303 inputs a data signal (DL data signal), signaling of an upper layer input from the frequency resource size setting section 301 and the resource pool setting section 302, and performs error correction encoding on the input signal, and outputs the encoded signal to the modulation section 304.

[0423] The modulation section 304 performs modulation processing on the signal input from the error correction encoding section 303, and outputs the modulated data signal to the signal allocation section 305.

[0424] The signal allocation section 305 allocates the data signal (for example, DL data signal or upper layer signaling) input from the modulation section 304 to a resource that can be used, for example, in a link (for example, Uu link) between the base station 300 and the terminal 400. The transmission signal formed is output to the transmission section 306.

[0425] The signal allocation section 305 specifies (in other words, identifies) the time slots and sub-channels that can be used for sidelink communication, for example, based on the information input by the resource pool setting section 302. Then, for example, in a case where the terminal 400 cannot simultaneously transmit and receive in the link (for example, the Uu link) for DL data and the sidelink, the signal allocation section 305 can allocate the data signal to the resources that are not used for the sidelink.

[0426] Further, the setting of the resource pool can be different for each terminal 400. In this case, the time slots that can be used in the Uu link are different for each terminal 400.

[0427] The transmission section 306 performs radio transmission processing such as up-conversion on the signal input by the signal allocation section 305, and transmits the signal to the terminal 400 via the antenna.

[0428] The reception section 307 receives the signal transmitted by the base station 400 via the antenna, performs reception processing such as down-conversion, and outputs the signal to the signal separation section 308.

[0429] The signal separation section 308 specifies the time slots that can be used in the Uu link and the time slots and sub-channels that can be used for sidelink communication, for example, based on the information input by the resource pool setting section 302. Then, the signal separation section 308 separates the signal input by the reception section 307, which is allocated to the resources that can be used in the Uu link. The signal separation section 308 outputs the separated signal (for example, the UL data signal) to the demodulation section 309.

[0430] The demodulation section 309 performs demodulation processing on the signal input by the signal separation section 308, and outputs the obtained signal to the error correction decoding section 310.

[0431] The error correction decoding section 310 decodes the signal input by the demodulation section 309, and obtains the reception data signal (UL data signal) from the terminal 400.

[0432] Further, in a case where the terminal 400 cannot simultaneously transmit and receive in the link (for example, the Uu link) for DL data and the sidelink, Figure 20The example shown illustrates a case where the base station 300 includes the frequency resource size setting section 301 and the resource pool setting section 302, and generates upper layer signaling including the frequency resource size setting information and the 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 can be set in an application layer called "pre-configuration" or can be set in advance in a subscriber identity module (SIM). In this case, the base station 300 can 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 can identify time slots usable between the base station 300 and the terminal 400 on the basis of the resource pool setting information set in advance, and output information indicating the time slots usable between the base station 300 and the terminal 400 to the signal allocation section 305 and the signal separation section 308.

[0433] In addition, the case where the setting regarding the frequency resource in the sidelink communication (for example, information regarding the frequency resource size) is set (or notified) to the terminal 400 by the base station 300 through signaling of an upper layer (for example, RRC) or MAC, for example, is described here, but is not limited thereto. For example, in a case where the setting regarding the frequency resource in the sidelink communication is specified in a specification (or a standard), the terminal 400 can operate even without the setting from the base station 300 in a case where the setting is made in a SIM or an application layer.

[0434] In addition, for example, in a case where the mode of the sidelink communication is "mode 1", it is assumed that the information included in the SCI transmitted by the terminal in the sidelink is generated by the base station 300. Therefore, in the case of mode 1, the base station 300 can generate the SCI (the same processing as that of the SCI generation section 410 of the terminal 400 described later) on the basis of the frequency resource size setting information and the resource pool setting information, for example, and transmit the SCI to the terminal 400. Further, the SCI can be included in signaling of an upper layer or a signal (for example, PDCCH) of a physical layer, for example.

[0435] [Structure of terminal]

[0436] Figure 20 is a block diagram showing a structure example of the terminal 400 of the present embodiment. In Figure 21 The terminal 400 includes a reception section 401, a signal separation section 402, an SCI reception section 403, a Uu demodulation section 404, a Uu error correction decoding section 405, an SL demodulation section 406, an SL error correction decoding section 407, a frequency resource size setting section 408, a resource pool setting section 409, an SCI generation section 410, a Uu error correction encoding section 411, a Uu modulation section 412, an SL error correction encoding section 413, an SL modulation section 414, a signal allocation section 415, and a transmission section 416.

[0437] Figure 21 The control circuit illustrated, for example, can include the SCI reception section 403, the frequency resource size setting section 408, the resource pool setting section 409, and the SCI generation section 410. In addition, Figure 19 The communication circuit illustrated, for example, can include the reception section 401 and the transmission section 416.

[0438] The reception section 401 receives a signal via an antenna, and outputs the signal after performing reception processing such as down-conversion, to the signal separation section 402.

[0439] The signal separation section 402 separates, based on the resource pool setting information input from the resource pool setting section 409, a signal component corresponding to a link (for example, a Uu link) between the base station 300 and the terminal 400, from the signal input from the reception section 401, and outputs the signal component to the Uu demodulation section 404.

[0440] In addition, the signal separation section 402 separates, based on the resource pool setting information, a signal component of a sidelink from the signal input from the reception section 401. Then, the signal separation section 402, for example, outputs a signal of the PSCCH in the signal component of the sidelink to the SCI reception section 403. In addition, the signal separation section 402 separates, based on the PSSCH resource allocation information input from the SCI reception section 403, a signal of the PSSCH for the terminal 400 from the signal component of the sidelink input from the reception section 401, and outputs the signal to the SL demodulation section 406.

[0441] The SCI reception section 403 demodulates and decodes the SCI input from the signal separation section 402. The SCI reception section 403, for example, attempts demodulation and decoding of the SCI, and in the case of successful decoding (in other words, in the case of detecting the SCI), specifies a candidate of the frequency resource size of the frequency resource in which the PSSCH is configured, from among the frequency resources reserved in the terminal 400, based on the resource allocation information of the PSSCH for the terminal 400 included in the SCI, and the frequency resource size setting information input from the frequency resource size setting section 408. Then, the frequency resource size setting section 301, for example, judges the frequency resource (for example, all of the frequency resources of the reserved frequency resources, a part of the frequency resources, or the like) in which the PSSCH is configured, based on the bit included in the SCI, and the candidate of the frequency resource size, and outputs the PSSCH resource allocation information indicating the frequency resource and the time resource in which the PSSCH is allocated, to the signal separation section 402. Furthermore, the SCI reception section 403, for example, can judge whether the information included in the SCI is information for the terminal 400, based on the transmission destination information included in the SCI.

[0442] The Uu demodulation section 404 performs demodulation processing on the signal input from the signal separation section 402, and outputs the obtained demodulated signal to the Uu error correction decoding section 405.

[0443] The Uu error correction decoding section 405 decodes the demodulated signal input from the Uu demodulation section 404, and outputs the obtained upper layer signaling to the frequency resource size setting section 408 and the resource pool setting section 409, and outputs the obtained reception data signal (or "Uu reception data signal").

[0444] The SL demodulation section 406 performs demodulation processing on the signal input from the signal separation section 402, and outputs the obtained demodulated signal to the SL error correction decoding section 407.

[0445] The SL error correction decoding section 407 decodes the demodulated signal input from the SL demodulation section 406, and performs error detection such as cyclic redundancy check (CRC) on the decoded signal. The SL error correction decoding section 407 outputs the obtained reception data signal (or "sidelink reception data signal") in a case where the decoded signal has no error.

[0446] The frequency resource size setting section 408 sets candidates of the frequency resource size of the frequency resource in which the PSCCH for the terminal 400 is allocated, for example, based on the frequency resource size setting information included in the upper layer signaling input from the Uu error correction decoding section 405. The frequency resource size setting section 408 outputs the frequency resource size setting information indicating the set candidates of the frequency resource size to the SCI reception section 403 and the SCI generation section 410.

[0447] The resource pool setting section 409 sets the resource pool (for example, time resource and frequency resource) used for the sidelink by the terminal 400, for example, based on the resource pool setting information included in the upper layer signaling input from the Uu error correction decoding section 405. The set resource pool can include, for example, any one or both of the resource used for transmission by the terminal 400 and the resource used for reception by the terminal 400. The resource pool setting section 409 outputs the resource pool setting information to the SCI generation section 410, the signal separation section 402, and the signal allocation section 415.

[0448] The SCI generation section 410 generates, for example, SCI including information related to the frequency resources in which the PSSCH is configured. For example, the SCI generation section 410 can generate the SCI based on the information (for example, information indicating the resources available for sidelink) input by the resource pool setting section 409, the information input by the frequency resource size setting section 408, and the amount of resources of the data contained in the transmission buffer (not illustrated). In addition, the SCI generation section 410 can generate, in the time slot in which the SCI is transmitted, the SCI including information indicating which size of the frequency resources in the frequency resource size candidate the PSSCH is allocated to (in other words, information indicating which of the frequency resource size candidates). In addition, the SCI can include, for example, information related to the decided resources, information identifying the terminal 400 that is the transmission source (for example, a transmission source ID), and information identifying the terminal 400 that is the transmission destination (for example, a transmission destination ID). The SCI generation section 410 outputs the generated SCI to the signal allocation section 415.

[0449] For example, in a case where the mode of the sidelink communication is "mode 2", the terminal 400 generates the SCI at the SCI generation section 410. In addition, for example, in a case where the mode of the sidelink communication is "mode 1", the base station 300 generates the SCI, and in a case where the base station 300 transmits the SCI to the terminal 400, the terminal 400 can generate the SCI based on the SCI transmitted by the base station 300.

[0450] The Uu error correction encoding section 411 inputs the transmission data signal of the Uu link (UL data signal) as an input, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the Uu modulation section 412.

[0451] The Uu modulation section 412 modulates the signal input by the Uu error correction encoding section 411, and outputs the modulated signal to the signal allocation section 415.

[0452] The SL error correction encoding section 413 inputs the transmission data signal of the sidelink (sidelink data signal) as an input, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the SL modulation section 414.

[0453] The SL modulation section 414 modulates the signal input by the SL error correction encoding section 413, and outputs the modulated signal to the signal allocation section 415.

[0454] The signal allocation unit 415, for example, allocates the PSCCH signal including the SCI and the PSSCH signal including the sidelink data signal input by the SL modulation unit 414 to sidelink resources based on information input by the resource pool setting unit 409 and the SCI generation unit 410. Additionally, the signal allocation unit 415 allocates the signal input by the Uu modulation unit 412 to resources of the Uu link (e.g., the uplink data channel (PUSCH)). The signal allocation unit 415 then outputs the allocated signals to the transmission unit 416.

[0455] The transmitting unit 416 performs up-conversion and other wireless transmission processing on the signal input from the signal distribution unit 415 and then transmits it.

[0456] Furthermore, in Figure 19 The example shown illustrates a scenario where terminal 400 receives upper-layer signaling including frequency resource size setting information and resource pool setting information, but is not limited to this. For example, at least one of the frequency resource size setting information and resource pool setting information can be set either at the application layer, referred to as "pre-configuration," or pre-configured at the SIM. In this case, terminal 400 may use the pre-configured information without receiving either the frequency resource size setting information or the resource pool setting information. For example, based on the pre-configured resource pool setting information, terminal 400 can identify resources that can be used between base station 300 and terminal 400, as well as resources that can be used in the sidelink, and use information related to these resources in signal separation unit 402 and signal allocation unit 415.

[0457] in addition, Figure 21 As an example, the demodulation unit, error correction decoding unit, error correction coding unit, and modulation unit may have different structural units in the Uu link and the side link, but it is not limited to this and may also have common structural units in the Uu link and the side link.

[0458] [Terminal 400 Actions]

[0459] Secondly, regarding terminal 400 (refer to...) Figure 21 Let me illustrate with an example of the action.

[0460] Figure 21 This is a flowchart illustrating an example of the processing of terminal 400.

[0461] The sidelink transmitting and receiving terminals 200 (e.g., transmitting terminal and receiving terminal) set parameters related to the sidelink (S201). The sidelink-related parameters may include, for example, time resources, frequency resources (e.g., sub-channels), SLBWP, resource pools, and settings of channels configured in each time slot.

[0462] The parameters related to sidelink can be notified from the transmitting terminal to the receiving terminal by the SCI, for example. Alternatively, for the terminal 200, the parameters related to sidelink can be specified in the specification (or the standard), can be set in the application layer called "pre-configuration", can be set in advance in the SIM, or can be set by the SIB or other RRC upper layer or the MAC called "configuration".

[0463] The terminal 200 performs sidelink communication (e.g., transmission and reception of data) based on the set parameters (S202).

[0464] Second, an example of a method of setting a frequency resource (e.g., a subchannel) is described.

[0465] In the present embodiment, the transmitting terminal, for example, transmits the SCI including information indicating the PSSCH configuration method for the frequency resource reserved in the sidelink communication to the receiving terminal. In the information indicating the PSSCH configuration method for the frequency resource reserved, information indicating whether the PSSCH is allocated in all of the frequency resources, in a part of the frequency resources, or not allocated (in other words, the reserved frequency resource is not used) can be included, for example.

[0466] The terminal 400 (e.g., the transmitting terminal and the receiving terminal) can determine the frequency resource in which the PSSCH is configured in each reserved time resource (e.g., a slot), for example, based on the notification.

[0467] Here, the information of the notification of the reserved frequency resource and the information indicating the PSSCH configuration method in the reserved frequency resource are different information. Therefore, the terminal 400 can specify the reserved frequency resource in other slots subsequent to the slot, even in a case where the PSSCH is allocated in a part of the frequency resources in the reserved frequency resource or not allocated, for example.

[0468] Therefore, according to the present embodiment, the terminal 400 can dynamically set the allocation in the reserved frequency resource even in a case where the single subchannel applying the separate PSCCH or PSCCH+PSSCH, for example, and can reduce the probability of collision between the PSCCH transmitting the SCI and the PSSCH of other UEs.

[0469] Further, the frequency resource size candidate can be specified in the specification (or the standard), can be set in advance in the SIM, can be set in the application layer called "pre-configuration", or can be set in the SIB or other RRC upper layer or the MAC called "configuration".

[0470] In addition, one or more of the frequency resource size candidates can be set. In addition, the frequency resource size candidates can be selected (in other words, informed) from all of the frequency resource size candidates by the SCI. In addition, the frequency resource size candidates can inform the terminal 400 of options from among a plurality of candidates determined in advance, and the terminal 400 selects from among the options by the SCI. Further, the options of the frequency resource size can be informed in a higher layer such as RRC or MAC, for example.

[0471] Next, the operation of the terminal 400 will be described.

[0472] [Action Example 4-1 (Single PSCCH)]

[0473] In Action Example 4-1, an example in which a single PSCCH is applied will be described.

[0474] In Action Example 4-1, for example, one bit of information (for example, either bit 0 or bit 1) is set (in other words, added) in the SCI.

[0475] In the one bit of information, bit 0 can indicate, for example, that the PSSCH is configured (in other words, allocated or used) to the frequency resource allocated by the "resource frequency location for initial transmission and retransmission" (in other words, the reserved frequency resource).

[0476] In addition, in the one bit of information, bit 1 can indicate, for example, that the PSSCH is not configured (in other words, not allocated or not used) to the frequency resource allocated by the "resource frequency location for initial transmission and retransmission" in the slot in which the SCI including the one bit of information is transmitted and received.

[0477] For example, the transmitting terminal can inform the receiving terminal that the PSSCH is not configured in the slot (for example, slot #0 of (a) of FIG. 15) in which the SCI is received by setting the one bit of information included in the SCI to bit 1. Figure 22

[0478] In addition, the transmitting terminal can reserve the frequency resource of the PSSCH in the slot (for example, slot #2 or #3 of (a) of FIG. 15) subsequent to the slot (for example, slot #0 of (a) of FIG. 15) in which the SCI is received by the resource allocation information (for example, the "resource frequency location for initial transmission and retransmission") different from the above-described one bit of information included in the SCI. Figure 18 Figure 18

[0479] [Action Example 4-2 (PSCCH+PSSCH Single Subchannel)]

[0480] In Action Example 4-2, an example in which a PSSCH+PSSCH single subchannel is applied will be described.

[0481] ​​​In Action Example 4-2, for example, 1-bit information (for example, either bit 0 or bit 1) is set (in other words, added) in SCI.

[0482] Of the 1-bit information, bit 0 may, for example, indicate PSSCH configuration (in other words, allocation or use) of the frequency resources allocated by the "resource frequency location for initial transmission and retransmission" (in other words, the reserved frequency resources).

[0483] In addition, of the 1-bit information, bit 1 may, for example, indicate PSSCH configuration of a part of the frequency resources (for example, 1 subchannel) allocated by the "resource frequency location for initial transmission and retransmission" in the slot in which the SCI including the 1-bit information is transmitted and received.

[0484] For example, the transmitting terminal can notify the receiving terminal that the PSSCH is configured in the 1-subchannel in the slot (for example, slot #0 of (b) of Action Example 4-2) in which the SCI is received, by setting the 1-bit information included in the SCI to bit 1. Figure 18

[0485] In addition, the transmitting terminal can reserve, for the receiving terminal, the frequency resources of the PSSCH in the slot (for example, slot #2 or #3 of (b) of Action Example 4-2) subsequent to the slot (for example, slot #0 of (b) of Action Example 4-2) in which the SCI is received, by the resource allocation information (for example, the "resource frequency location for initial transmission and retransmission") included in the SCI other than the above 1-bit information. Figure 18 Figure 18

[0486] Further, in Action Example 4-2, 1-subchannel is described as an example of the part of the frequency resources notified by the 1-bit information, but is not limited thereto. For example, the part of the frequency resources notified by the 1-bit information can be a plurality of subchannels or a plurality of PRBs among the frequency resources allocated by the "resource frequency location for initial transmission and retransmission".

[0487] In addition, Action Example 4-2 is not limited to the initial transmission of the TB, and can be applied at the time of retransmission of the TB. Figure 18 An example in which Action Example 4-2 is applied at the time of retransmission of the TB is described. For example Figure 23 In Action Example 4-2-1, bit 0 is notified in slot #0, and the frequency resources for the initial transmission of TB#1 are set to a part of the frequency resources (for example, 1 subchannel). In addition, for example Figure 23 In Action Example 4-2-2, bit 1 is notified in slot #2, and the frequency resources for the retransmission of TB#1 are set to the frequency resources reserved in the terminal 400 (for example, 3 subchannels). In addition, for example Figure 23 ​​​In the case of bit 1 in slot #20, the frequency resource for the initial transmission of TB#2 is set to the frequency resource (e.g., 3 sub-channels) reserved in the terminal 400. In addition, for example Figure 23 In the case of bit 0 in slot #22, the frequency resource for the retransmission of TB#2 is limited to a part of the frequency resource (e.g., 1 sub-channel).

[0488] In Figure 23 In the case of bit 1 in slot #20, the frequency resource for the initial transmission of TB#2 is set to the frequency resource (e.g., 3 sub-channels) reserved in the terminal 400. In addition, for example

[0489] [Action Example 4-3]

[0490] In Action Example 4-3, a configuration example of a plurality of frequency resource sizes is described.

[0491] For example, a bit (e.g., a bit included in SCI) that notifies of the PSSCH configuration of a part or all of the frequency resources (e.g., sub-channels) allocated by the "resource frequency position of initial transmission and retransmission" is set (in other words, added).

[0492] For example, a case where 2 bits of information are set is described.

[0493] For example, as shown below, 2 bits of information can indicate the ratio (in other words, the frequency resource size) of the resources in which the PSSCH is configured with respect to all of the frequency resources allocated by the "resource frequency position of initial transmission and retransmission".

[0494] Bit 00: All resources

[0495] Bit 01: 1 / 2 resources

[0496] Bit 10: 1 / 4 resources

[0497] Bit 11: 1 sub-channel

[0498] For example, in the case of bit 01 or bit 10, that is, 1 / 2 resources or 1 / 4 resources, the terminal 400 can determine the number of sub-channels in which the PSSCH is configured by dividing the number of sub-channels allocated by the "resource frequency position of initial transmission and retransmission" by 2 or 4. At this time, in the case where the division result is not an integer, for the values below the decimal point, the terminal 400 can, for example, round down to calculate the number of sub-channels like Floor (number of sub-channels) or round up to calculate the number of sub-channels like Ceil (number of sub-channels).

[0499] In addition, for example, in the case of being bit 01, which is 1 / 2 resource, the terminal 400 can generate two subchannel groups by 2-division of the number of subchannels allocated by the "resource frequency position of initial transmission and retransmission". Similarly, for example, in the case of being bit 10, which is 1 / 4 resource, the terminal 400 can generate four subchannel groups by 4-division of the number of subchannels allocated by the "resource frequency position of initial transmission and retransmission". Then, the terminal 400 can select one of the subchannel groups.

[0500] Further, the candidates of the frequency resource size (for example, all resources, 1 / 2 resources, 1 / 4 resources, or one subchannel) are an example, and other values can also be used. In addition, the candidates of the frequency resource size can also include an example in which no PSSCH is allocated (PSSCH is not used) as in Action Example 4-1.

[0501] In addition, the number of bits of the information indicating the frequency resource size is not limited to 2 bits, and other numbers of bits can also be used. For example, the more the types of the frequency resource size, the more the number of bits of the SCI can be increased.

[0502] In this way, even in a case where the terminal 400 configures the PSSCH in a part of the subchannels of the reserved frequency resources in a certain time slot (for example, the first time slot) among the reserved time resources (for example, time slots), the terminal 400 can reserve the frequency resources of the PSSCH in a time slot (for example, a subsequent time slot) different from the time slot in which the SCI is received.

[0503] The above describes Action Examples 4-1 to 4-3, respectively.

[0504] According to the present embodiment, the terminal 200 determines the subchannels in which the PSSCH is respectively configured in the reserved multiple time slots, for example, based on the notification information related to the use (for example, use of all subchannels, use of a part of the subchannels, or non-use) of the reserved multiple subchannels.

[0505] Through this determination of the subchannels, for example, even in a case where a single PSCCH or PSSCH+PSSCH is applied to a single subchannel, the terminal 400 can allocate the PSSCH in the reserved multiple time slots based on different frequency resource sizes, respectively.

[0506] Therefore, according to the present embodiment, for example, since the frequency resource size can be dynamically set even in a case where there are more types of services than in LTE, as in NR, it is possible to improve the efficiency of resource allocation (for example, frequency resource allocation or reservation) in wireless communication (for example, sidelink communication).

[0507] [Selection method of subchannel]

[0508] An example of a selection method of a subchannel in which a part of frequency resources configured with a PSSCH among frequency resources set as a reservation will be described.

[0509] For example, in Action Example 4-2 and Action Example 4-3, the selected subchannel can be a subchannel including SCI. In V2X, for example, a PSCCH region is being studied to be included in a PSSCH region. At this time, in a case where a subchannel in which PSCCH is transmitted is the same as a subchannel in which PSSCH is transmitted, the number of subchannels occupied by PSSCH and PSCCH can be reduced. For example, in a case where PSSCH is configured in 1 subchannel, the selected subchannel can be set to 1 subchannel including PSCCH. In addition, in a case where a plurality of subchannels can be selected as in Action Example 4-3, for example, a subchannel group including PSCCH among subchannel groups divided by "resource frequency positions of initial transmission and retransmission" can be selected.

[0510] In addition, for example, in Action Example 4-2 and Action Example 4-3, among the selected subchannels, a subchannel having the lowest or highest subchannel number among frequency resources allocated by "resource frequency positions of initial transmission and retransmission" can be included. For example, in a case where a plurality of subchannels can be selected as in Action Example 4-3, a subchannel group having the lowest or highest subchannel number among subchannel groups divided by "resource frequency positions of initial transmission and retransmission" can be selected.

[0511] In addition, in Action Example 4-2 and Action Example 4-3, among the selected subchannels, a subchannel determined based on a value identifying a UE among frequency resources allocated by "resource frequency positions of initial transmission and retransmission", such as a UE ID, a Radio Network Temporary Identifier (RNTI), a Layer 1 source ID, or a Layer 1 destination ID, can be included. For example, the terminal 400 can select a subchannel having a number obtained by adding a remainder of a value identifying a UE divided by the number of subchannels allocated to the terminal 400 to the lowest subchannel number among the subchannels allocated to the terminal 400. In addition, for example, in a case where a plurality of subchannels can be selected as in Action Example 4-3, the terminal 400 can select a subchannel group having a number obtained by adding a remainder of a value identifying a UE divided by the number of groups of subchannel groups divided by "resource frequency positions of initial transmission and retransmission" to the lowest subchannel group number.

[0512] [TB size (Transport block size)]

[0513] In addition, for example, as in Action Example 4-2 and Action Example 4-3, in a case where the PSSCH is configured in a part of the subchannels, the amount of resources in which the PSSCH is configured is less than the amount of resources in which the PSSCH is configured in the entirety of the plurality of subchannels that are reserved. In NR, for example, the TB size is calculated based on the amount of resources in the time domain and the frequency domain that are allocated, and the MCS that is notified by the control signal (for example, DCI).

[0514] Therefore, for example, if the TB that is configured in a part of the frequency resources of the frequency resources allocated to the terminal 400 is initially transmitted, and the TBS is calculated based on the amount of resources at the time of the initial transmission, even in a case where the amount of resources for retransmission is greater than the amount of resources at the time of the initial transmission, the number of system bits that can be transmitted at the time of retransmission can be reduced. In this case, the quality of the PSSCH that is configured in the resources for retransmission becomes excessive, and the efficiency of use of the resources decreases.

[0515] In this regard, in the present embodiment, for example, as in Action Example 4-2 and Action Example 4-3, in a case where the PSSCH is configured in a part of the subchannels, the TBS can be calculated based on the size of the entirety of the subchannels that are specified by the "resource frequency position of the initial transmission and retransmission". In other words, regardless of the frequency resources (for example, subchannels) in which the PSSCH is configured, the TBS can be calculated based on the size of the entirety of the frequency resources that are reserved.

[0516] By determining the TBS, it is possible to suppress the quality of the PSSCH that is configured in the resources for retransmission from becoming excessive. In addition, for example, the terminal can determine the number of system bits that are transmitted while taking into account the amount of resources for retransmission at the time of the initial transmission, and set the MCS.

[0517] (Action Example 5-1)

[0518] In Embodiment 4, a method in which the size of the frequency resources in which the PSSCH is configured is explicitly notified by the bits included in the SCI was described. In contrast, in the present embodiment, a method in which the size of the frequency resources in which the PSSCH is configured is implicitly notified is described.

[0519] According to the present embodiment, the terminal 400 can notify the sizes of the plurality of frequency resources in which the PSSCH is configured without increasing the number of bits of the SCI.

[0520] The basic structure of the base station and the terminal of the present embodiment is common to the base station 300 and the terminal 400 of Embodiment 4.

[0521] Hereinafter, an example of the method of setting the frequency resources (for example, subchannels) of the present embodiment will be described.

[0522] (Action Example 5-1)

[0523] In Action Example 5-1, the notification of the frequency resource size (in other words, the configuration method of the PSSCH) uses the "priority indication" or "QoS indication" included in the SCI. Further, in LTE, it is called "priority indication", but in the SCI of NR, it is also possible to be called a different name (for example, "QoS indication").

[0524] It is being studied to include information such as priority, latency, or reliability in the priority indication or QoS indication. It is being studied to perform control such as resource allocation, congestion control between terminals, resolution of in-device coexistence issues in a case where a plurality of data is generated in a terminal, or power control based on the priority indication or QoS indication.

[0525] In Action Example 5-1, the terminal 400 can determine the frequency resource size of the PSSCH based on the priority indication or QoS indication, for example. In other words, the information included in the priority indication or QoS indication is associated with the frequency resource size (in other words, the configuration method of the PSSCH).

[0526] For example, the terminal 400 specifies the latency (in other words, the desired latency) or the required reliability that the terminal 400 requires based on the priority indication or QoS indication.

[0527] Then, the terminal 400 can allocate the PSSCH to all of the reserved frequency resources, for example, in a case where the specified latency is short or the reliability is high (for example, in a case where it is less than a threshold value). In addition, the terminal 400 can not allocate the reserved frequency resources to the PSSCH or can allocate to a part of the frequency resources in a case where the specified latency is long or the reliability is low (for example, in a case where it is equal to or more than a threshold value). Further, the part of the frequency resources can be set based on any one of Action Examples 4-1 to 4-3, for example.

[0528] Further, the frequency resource size in which the PSSCH is configured in a case where the latency is short or the reliability is high is not limited to all of the reserved frequency resources, and can be set to a size larger than the frequency resource size in which the PSSCH is configured in a case where the latency is long or the reliability is low, for example.

[0529] For example, by configuring the PSSCH in all of the frequency resources reserved, the reception quality of the PSSCH can be improved compared to a case where the PSSCH is configured in a part of the frequency resources reserved, and thus the amount of delay or reliability required by the terminal 400 can be easily satisfied.

[0530] The mapping of the priority indication or the QoS indication to the frequency resource size can be specified in a specification (or a standard), can be set in a SIM, can be set in an application layer called "pre-configuration", or can be set in an SIB or another RRC upper layer or a MAC called "configuration".

[0531] In addition, the terminal 400 can determine, for example, whether the TB included in the received PSSCH is a TB that is initially transmitted or a TB that is retransmitted, on the basis of a retransmission index included in the SCI.

[0532] According to Action Example 5-1, the terminal 400 can notify the frequency resource size without using a new bit. In addition, for example, the terminal 400 can configure the PSSCH in the frequency resources on the basis of a frequency resource size that is appropriate for a parameter (for example, the amount of delay or reliability required) corresponding to a value set in LTE.

[0533] [Action Example 5-2]

[0534] In Action Example 5-2, the notification of the frequency resource size (the configuration method of the PSSCH) uses a redundancy version (RV) included in the SCI.

[0535] As described in Embodiment 2 (Action Example 2-2), in NR, retransmission control by notification of an RV and a new data indicator (NDI) is also studied in the SCI, for example, as with downlink control information (DCI).

[0536] As described in Embodiment 2, for example, in the circular buffer shown in Figure 23 In the circular buffer shown in Figure 15 In the circular buffer shown in

[0537] Thus, it is expected that even if a part (for example, 1) of the plurality of RVs is used to notify that the PSSCH is not configured (in other words, the reserved frequency resources are not used), as in Action Example 4-1, or the PSSCH is configured in a part of the reserved frequency resources, as in Action Example 4-2, the reception characteristics in the terminal 400 are not easily deteriorated.

[0538] In this regard, in Action Example 5-2, the terminal 400 can determine the frequency resource size of the PSSCH, for example, on the basis of the RV. In other words, the RV is associated with the frequency resource size (in other words, the configuration method of the PSSCH).

[0539] As Example 1 of Action Example 5-2, the terminal 400 can use the bit used in the notification of the RV3 to notify the frequency resource size as shown below. Further, hereinafter, as an example, the RV0 is notified by the bit 00, the RV1 is notified by the bit 01, the RV2 is notified by the bit 10, and the RV3 is notified by the bit 11.

[0540] In Example 1, the bit 11 can notify the PSSCH configuration of a part of the frequency resources of the reservation, or the PSSCH configuration of none (non-use of the frequency resources of the reservation) and the RV0 instead of the RV3.

[0541] 00: PSSCH is configured for the RV0 and all of the frequency resources of the reservation

[0542] 01: PSSCH is configured for the RV1 and all of the frequency resources of the reservation

[0543] 10: PSSCH is configured for the RV2 and all of the frequency resources of the reservation

[0544] 11: PSSCH is configured for the RV0 and a part of the frequency resources of the reservation, or the PSSCH configuration of none

[0545] Further, for example, the bit 11 can be associated with a smaller frequency resource size than the bits 00, 01, and 10. In other words, for example, among the bits 00, 01, and 10, a larger frequency resource size (for example, all or a part of the frequency resources of the reservation) can be associated with the bit 11 than the bits 00, 01, and 10.

[0546] For example, in the case where the PSSCH is configured for all of the frequency resources of the reservation, one of the RV0, the RV1, and the RV2 can be set, and, in the case where the PSSCH is configured for a part of the frequency resources of the reservation, one of the RV0 can be set. However, it is assumed that the case where the PSSCH is configured for a part of the frequency resources of the reservation is the initial transmission of the TB. Therefore, even if the RV that can be set in the case where the PSSCH is configured for a part of the frequency resources of the reservation is one of the RVs that are easily used at the initial transmission, the retransmission efficiency is not easily deteriorated.

[0547] Further, in Example 1, the case where the bit 11 corresponding to the RV3 is used for the notification of the frequency resource size different from the bits corresponding to the other RVs is described, but the notification of the interval different from the bits corresponding to the other RVs can also use the bit corresponding to the other RV (for example, the RV1) different from the RV3.

[0548] In addition, as an example 2 of the operation example 5-2, 2 of the plurality of RVs (for example, RV1 and RV3) can be used to notify the configuration of the PSSCH to a part of the frequency resources of the reservation, like the operation example 4-2. In the case of the example 2, as shown below, RV0 or RV2 can be set instead of RV1 and RV3.

[0549] 00: PSSCH is configured to RV0 and all of the frequency resources of the reservation

[0550] 01: PSSCH is configured to RV0 and a part of the frequency resources of the reservation

[0551] 10: PSSCH is configured to RV2 and all of the frequency resources of the reservation

[0552] 11: PSSCH is configured to RV2 and a part of the frequency resources of the reservation

[0553] In this way, in a case where the configuration of the PSSCH to a part of the frequency resources of the reservation is notified instead of the 2 states of the RV (for example, RV1 and RV3) being notified, the terminal 400 can support the operation of the configuration of the PSSCH to a part of the frequency resources of the reservation at the time of retransmission (for example, in the case of RV2) in addition to the time of initial transmission (for example, in the case of RV0).

[0554] In addition, the terminal 400 can reduce the amount of resources used by selecting the configuration of the PSSCH to a part of the frequency resources of the reservation, for example, in a case where all of the frequency resources of the reservation do not need to be allocated at the time of retransmission, and thus can reduce interference and can reduce the probability of collision with resources transmitted by other UEs.

[0555] Further, in the operation example 5-2, the notification of the configuration of the PSSCH to a part of the frequency resources of the reservation can be replaced (or added) by the notification of the configuration of no PSSCH by the RV.

[0556] [Operation Example 5-3]

[0557] In the operation example 5-3, the notification of the frequency resource size (in other words, the configuration method of the PSSCH) uses the "RV" and the "retransmission index" included in the SCI.

[0558] The retransmission index is information that notifies which of the initial transmission and the retransmission.

[0559] In the operation example 5-3, the terminal 400 can determine the frequency resource size of the PSSCH, for example, on the basis of the RV and the retransmission index (for example, information indicating the retransmission of data). In other words, the combination of the RV and the retransmission index (transmission type) is associated with the frequency resource size (in other words, the configuration method of the PSSCH).

[0560] For example, by limiting the RV type that can be used according to the initial transmission and retransmission, instead of notifying the reservation of a part of the frequency resources, the PSSCH is configured.

[0561] For example, in a 3-bit bit string obtained by combining a 2-bit RV and a 1-bit retransmission index, the first 2 bits are used for the RV and the last 1 bit is used for the retransmission index. In addition, for example, in the case where the retransmission index (for example, the 3rd bit in 3 bits) is 0, the initial transmission is indicated, and in the case where it is 1, the retransmission is indicated. In addition, for example, the RV is set to one of RV0 and RV3 at the initial transmission, and is set to one of RV2 and RV1 at the retransmission.

[0562] In this case, the RV, interval, and transmission type (initial transmission or retransmission) can be set for a 3-bit bit string (for example, 000 to 111) as shown below.

[0563] 000: RV0, all of the frequency resources of the reservation, PSSCH, and initial transmission

[0564] 001: RV2, all of the frequency resources of the reservation, PSSCH, and retransmission

[0565] 010: RV0, a part of the frequency resources of the reservation, PSSCH, and initial transmission

[0566] 011: RV2, a part of the frequency resources of the reservation, PSSCH, and retransmission

[0567] 100: RV3, all of the frequency resources of the reservation, PSSCH, and initial transmission

[0568] 101: RV1, all of the frequency resources of the reservation, PSSCH, and retransmission

[0569] 110: RV3, a part of the frequency resources of the reservation, PSSCH, and initial transmission

[0570] 111: RV1, a part of the frequency resources of the reservation, PSSCH, and retransmission

[0571] For example, at the initial transmission, RV0 or RV3, which can include more systematic bits, is selected compared to RV1 and RV2, and at the retransmission, RV1 or RV2, which can include more parity bits that are not included in the initial transmission, is selected.

[0572] According to Action Example 5-3, the number of RVs that can be selected in the initial transmission and the retransmission is reduced, but since the RVs suitable for the initial transmission and the retransmission, respectively, are included in the options, it is possible to suppress the degradation of the reception quality in the terminal 400.

[0573] Further, in Action Example 5-3, instead of (or in addition to) notifying the reservation of a part of the frequency resources, the no-PSSCH configuration can be notified by the RV and the retransmission index.

[0574] [Action Example 5-4]

[0575] In Action Example 5-4, the notification of the frequency resource size (in other words, the configuration method of the PSSCH) uses the HARQ process number (or HARQ process ID) included in the SCI.

[0576] In NR, support of multiple processes is being studied, and the HARQ process ID can be notified by the SCI.

[0577] In Action Example 5-4, the terminal 400 can determine the frequency resource size of the PSSCH, for example, based on the HARQ process ID. In other words, the HARQ process ID is associated with the frequency resource size (in other words, the configuration method of the PSSCH).

[0578] For example, the configuration of the PSSCH for all of the frequency resources of the reservation or the configuration of the PSSCH for a part of the frequency resources of the reservation can be set for each HARQ process.

[0579] Further, the setting method for each HARQ process can be specified in the specification (or the specification), can be set in advance in the SIM, can be set in the application layer called "pre-configuration", or can be set in the SIB or other RRC upper layer or the MAC called "configuration".

[0580] The above describes Action Examples 5-1 to 5-4.

[0581] Further, any two or more of Action Examples 5-1 and 5-4 can be combined.

[0582] In the present embodiment, the frequency resource size of the PSSCH is implicitly notified by the information specified in other uses. Therefore, according to the present embodiment, for example, in the sidelink, in order to notify the frequency resource size of the PSSCH, for example, new information does not need to be added to the parameters specified in LTE, and thus the overhead of the signaling can be reduced.

[0583] (Embodiment 6)

[0584] In NR V2X, for example, it is being studied to transmit the SCI in two stages.

[0585] For example, the SCI of the first stage (also referred to as "1st SCI", for example) is configured in the PSCCH, and the SCI of the second stage (also referred to as "2nd SCI", for example) is configured in a part of the PSSCH region.

[0586] The first-stage SCI can be received by other terminals in addition to the receiving terminal (in other words, the transmission destination terminal of the SCI), for example. The other terminals can perform sensing of the reservation status of the resources based on the first-stage SCI, for example.

[0587] On the other hand, in the second-stage SCI, the amount of resources or the resource region is notified by the first-stage SCI, for example. In addition, it is under study that the second-stage SCI is received by the receiving terminal and is not received by other terminals.

[0588] In this regard, the number of bits of the first-stage SCI can be reduced by including, in the first-stage SCI, information that can be used for sensing by other terminals different from the transmission destination terminal of the SCI, and not including information that is not used for sensing, for example. By this configuration of the first-stage SCI, it is possible to reduce the coding rate of the first-stage SCI and transmit it (in other words, redundantly), which can be easily received by other terminals, for example.

[0589] In addition, the second-stage SCI can be transmitted at a coding rate that can be received by the receiving terminal, for example, since it is sufficient that the receiving terminal that is the transmission destination terminal of the SCI is received.

[0590] In the present embodiment, a method of notifying the frequency resources of the two-stage SCI will be described.

[0591] The basic structure of the base station and the terminal of the present embodiment is common to the base station 300 and the terminal 400 of Embodiment 4.

[0592] Next, an example of the operation of the terminal 400 of the present embodiment will be described.

[0593] [Example of Operation 6-1]

[0594] In the example of operation 6-1, the terminal 400 transmits the first-stage SCI including the information related to the frequency resources in Embodiment 4 to the receiving terminal, for example.

[0595] According to the example of operation 6-1, other terminals different from the receiving terminal can also receive the first-stage SCI, for example. The other terminals different from the receiving terminal can recognize the frequency resources in which the PSSCH is configured, for example.

[0596] The other terminals can use the information related to the frequency resources in which the PSSCH is configured for interference measurement, for example. Since the PSSCH is not configured to the frequency resources in the example of operation 4-1 of Embodiment 4, the example of operation 6-1 is effective, for example.

[0597] In addition, the terminal 400 can change the region in which the second-stage SCI is allocated, according to the region in which the PSSCH is actually allocated, for example, in a case where the PSSCH is configured in a part of the frequency resources in Action Example 4-2 or Action Example 4-3 of Embodiment 4.

[0598] [Action Example 6-2]

[0599] In Action Example 6-2, the terminal 400 transmits the second-stage SCI including the information related to the frequency resources in Action Example 4-2 or Action Example 4-3 of Embodiment 4 to the receiving terminal, for example.

[0600] According to Action Example 6-2, for example, since the number of bits transmitted in the first-stage SCI can be reduced, the coding rate of the first-stage SCI can be reduced, and thus the probability that the other terminal can receive the SCI can be improved.

[0601] In addition, in Action Example 6-2, the receiving terminal cannot specify the frequency resources in which the PSSCH is configured from the first-stage SCI. In this regard, the receiving terminal can assume, for example, a case where the PSSCH is configured in a part of the frequency resources in Action Example 4-2 or Action Example 4-3 of Embodiment 4, and set the region in which the second-stage SCI is allocated to the same subchannel as the PSSCH.

[0602] Alternatively, the terminal 400 can set the region in which the second-stage SCI is allocated to the frequency domain in which the number of subchannels is the smallest in Action Example 4-2 or Action Example 4-3 of Embodiment 4.

[0603] (Embodiment 7)

[0604] In Embodiment 4, a method of notifying the frequency resources (in other words, the frequency resource size) in which the PSSCH is configured from the frequency resources allocated by the “resource frequency position of initial transmission and retransmission” included in the SCI is described.

[0605] In the present embodiment, for example, a method of including information related to the allocation of the frequency resources in each of the plurality of time resources (for example, slots) reserved in one SCI, and allocating different frequency resources in the plurality of slots is described.

[0606] According to the present embodiment, for example, compared with Embodiment 4, the flexibility of the frequency resource allocation can be improved.

[0607] The basic structure of the base station and the terminal of the present embodiment is common to the base station 300 and the terminal 400 of Embodiment 4.

[0608] Hereinafter, Action Examples of the terminal 400 of the present embodiment are described.

[0609] [Action Example 7-1]

[0610] In Action Example 7-1, the SCI includes information related to frequency resource allocation in multiple slots.

[0611] As an example, a case where one SCI includes information related to frequency resource allocation in four slots is described. In this example, the terminal 400 can notify, for example, information related to frequency resource allocation in four slots in the reserved time resources through the SCI.

[0612] Figure 15 An example of resource allocation in Action Example 7-1 is shown.

[0613] In Action Example 7-1, the interval notified by "Resource reservation" included in the SCI is 20 ms, and the first allocated resource in the time domain is slot #0. Figure 24 As shown in Action Example 7-1, the terminal 400 can include the following information in the information related to frequency resource allocation (for example, resource indication value (RIV)) in the SCI of slot #0.

[0614] Figure 24 Subchannel #1

[0615] Subchannels #0, #1, #2

[0616] Subchannels #1, #2

[0617] Subchannels #0, #1

[0618] In Action Example 7-1, the frequency resources of the four slots notified in slot #0 correspond to slot #0, slot #20, slot #40, and slot #60, respectively.

[0619] The terminal 400 that receives the SCI in slot #0 can recognize the frequency resource allocation of the four slots based on slot #0. In other words, the terminal 400 can reserve the frequency resources of the four slots based on one SCI, for example, based on slot #0. In addition, as shown in the above example, the frequency resources of the four slots can be set, for example, in each slot.

[0620] As shown in Action Example 7-1, the terminal 400 can include the following information in the information related to frequency resource allocation (for example, RIV) in the SCI of slot #20.

[0621] Figure 24

[0622] Subchannels #0, #1, #2

[0623] Subchannels #1, #2

[0624] Subchannels #0, #1​​​

[0625] subchannel #0, #1, #2

[0626] The frequency resources of the above-described 4 slots notified in the slot #20 correspond to the slot #20, the slot #40, the slot #60, and the slot #80, respectively.

[0627] The terminal 400 that receives the SCI in the slot #20 can identify the frequency resource allocation of 4 slots according to the slot #20. In other words, the terminal 400 can reserve the frequency resources of 4 slots based on 1 SCI, for example, according to the slot #20. In addition, as shown in the above example, the frequency resources of 4 slots can be set in each slot, for example.

[0628] According to Action Example 7-1, the frequency resources in multiple slots can be flexibly reserved by 1 SCI.

[0629] Further, the allocation of the above-described 4 slots of the frequency resources (for example, subchannels) is an example, and the allocation of other subchannels can also be possible. In addition, the number of slots of the frequency resources notified by 1 SCI is not limited to 4 slots, and the number of other slots can also be possible.

[0630] [Action Example 7-2]

[0631] In Action Example 7-2, the SCI includes information related to the frequency resource allocation in multiple slots.

[0632] As an example, a case in which the information related to the frequency resource allocation of 4 slots is included in 1 SCI is described. In the case of this example, the terminal 400 can notify the information related to the frequency resource allocation of 4 slots in the reserved time resources through the SCI, for example.

[0633] Figure 24 A resource allocation example in Action Example 7-2 is shown.

[0634] In Action Example 7-2, the interval notified by the "resource reservation" included in the SCI is 20 ms, the time interval between the initial transmission and the retransmission notified by the "time interval between initial transmission and retransmission" is 2 slots, and the first allocated resource in the time domain is the slot #0. Figure 25 As shown in Action Example 7-2, the terminal 400 can include the following information in the information related to the frequency resource allocation (for example, RIV) in the SCI of the slot #0.

[0635] Figure 25 As shown in Action Example 7-2, the terminal 400 can include the following information in the information related to the frequency resource allocation (for example, RIV) in the SCI of the slot #0.

[0636] subchannel #1

[0637] subchannel #0, #1, #2

[0638] subchannel #1, #2​

[0639] subchannel #0, #1

[0640] The above-mentioned 4 time slots' frequency resources informed in the time slot #0 correspond to the time slot #0, the time slot #2, the time slot #20, and the time slot #22, respectively. Further, in the time slot #2 and the time slot #22, resources for retransmission of data (e.g., PSSCH) transmitted in the time slot #0 and the time slot #20 are used. Figure 25

[0641] The terminal 400 which received the SCI in the time slot #0 can recognize the 4 time slots' frequency resource allocation according to the time slot #0. In other words, the terminal 400 can reserve the 4 time slots' frequency resources based on 1 SCI, e.g., according to the time slot #0. In addition, as shown in the above example, the 4 time slots' frequency resources can be set, e.g., in each time slot.

[0642] In addition, in Action Example 7-2, the terminal 400 can also inform the frequency resources for initial transmission in the time slot #2 and the time slot #22 which are the resources for retransmission as shown in the above. Figure 25

[0643] For example, as shown in Action Example 7-2, the terminal 400 can include the following information in the SCI in the time slot #2 in the information (e.g., RIV) related to the frequency resource allocation. Figure 25

[0644] subchannel #1

[0645] subchannel #0, #1, #2

[0646] subchannel #1, #2

[0647] subchannel #0, #1

[0648] The above-mentioned 4 time slots' frequency resources informed in the time slot #2 correspond to the time slot #0, the time slot #2, the time slot #20, and the time slot #22, respectively. The above-mentioned 4 time slots' frequency resources informed in the time slot #2 (at the time of retransmission) are the same as the 4 time slots' frequency resources informed in the time slot #0 (at the time of initial transmission), for example.

[0649] In addition, similarly, in the time slot #22 which is the resource for retransmission, the same frequency resources as the 4 time slots' frequency resources informed in the time slot #20 which is the resource for initial transmission can be informed, for example. Similarly, in the time slot #42 which is the resource for retransmission, the same frequency resources as the 4 time slots' frequency resources informed in the time slot #40 which is the resource for initial transmission can be informed, for example.

[0650] According to Action Example 7-2, for example, in the time slot #2 and the time slot #22 which are the resources for retransmission, the terminal 400 can inform the frequency resources for initial transmission. Figure 25 ​​​That is, even in a case where the SCI of the slot #0 cannot be received due to a half duplex problem or another factor, the terminal 400 (receiving terminal) can calculate the TBS of the PSSCH of the slot #2 from the frequency resources of the slot #0 based on the SCI of the slot #2, and can receive the PSSCH of the slot #2.

[0651] In addition, according to the Action Example 7-2, the frequency resources in the plurality of slots can be flexibly reserved by one SCI.

[0652] Further, the allocation of the frequency resources (for example, subchannels) of the above-described four slots is an example, and allocation of other subchannels can also be possible. In addition, the number of slots of the frequency resources that can be notified by one SCI is not limited to four slots, and other numbers of slots can also be possible.

[0653] [Action Example 7-3]

[0654] In the Action Example 7-3, the SCI includes information related to the allocation of the frequency resources in the plurality of slots. In addition, in the Action Example 7-3, the allocation of the frequency resources included in the SCI is periodically repeated at a certain time interval (for example, interval).

[0655] As an example, a case where the information related to the allocation of the frequency resources of two slots is included in one SCI will be described. In the case of this example, the terminal 400 can notify, for example, the information related to the allocation of the frequency resources of two slots in the reserved time resources by the SCI.

[0656] For example, a case where the interval notified by the "resource reservation" included in the SCI is 20 ms and the first allocated resource in the time domain is the slot #0 is assumed. In this case, the terminal 400 can include, for example, the following information in the information related to the allocation of the frequency resources (for example, RIV) in the SCI of the slot #0.

[0657] Subchannel #1

[0658] Subchannels #0, #1, and #2

[0659] For example, among the frequency resources of the above-described two slots notified in the slot #0, the subchannel #1 corresponds to the slot #0, the slot #40, the slot #80, …, which are the slots of a period of 40 ms that is twice the interval of 20 ms from the first slot (for example, the slot #0). In addition, among the frequency resources of the above-described two slots notified in the slot #0, the subchannels #0, #1, and #2 correspond to the slot #20, the slot #60, the slot #100, …, which are the slots of a period of 40 ms that is twice the interval of 20 ms from the second slot (for example, the slot #20).

[0660] In addition, the terminal 400 can include the following information in the information (e.g., RIV) related to the frequency resource allocation in the SCI in slot #20.

[0661] Subchannel #0, #1, #2

[0662] Subchannel #1

[0663] Similarly, in the above-mentioned 2-slot frequency resources notified in slot #20, for example, subchannels #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). In addition, in the above-mentioned 2-slot frequency resources notified in slot #20, subchannel #1 corresponds to slot #40, slot #80, slot #120,..., which are 40 ms periods from the second slot (e.g., slot #40).

[0664] In addition, as a variation of Action Example 7-3, as illustrated in Action Example 7-3-1, the terminal 400 can include the following information in the information (e.g., RIV) related to the frequency resource allocation in the SCI in slot #20. Figure 25

[0665] For example, in Action Example 7-3-2, the terminal 400 can notify the information related to the frequency resource allocation of 2 slots in the reserved time resources by the SCI. Figure 26

[0666] In Action Example 7-3-3, 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. Figure 26 As illustrated in Action Example 7-3-3, the terminal 400 can include the following information in the information (e.g., RIV) related to the frequency resource allocation in the SCI in slot #0.

[0667] Figure 26 Subchannel #1

[0668] Subchannel #0, #1, #2

[0669] For example, in the above-mentioned 2-slot frequency resources notified in slot #0, subchannel #1 corresponds to the primary transmission resource, i.e., slot #0, slot #20, slot #40,..., which are 20 ms intervals from the first slot (e.g., slot #0). In addition, in the above-mentioned 2-slot frequency resources notified in slot #0, subchannels #0, #1, and #2 correspond to the retransmission resource, i.e., slot #2, slot #22, slot #42,..., which are 20 ms intervals from the second slot (e.g., slot #2).

[0670]

[0671] In addition, as illustrated in Action Example 7-3-4, the terminal 400 can include the following information in the information (e.g., RIV) related to the frequency resource allocation in the SCI in slot #0. Figure 26 ​​​​As shown, the terminal 400 can include the following information in the information (e.g., RIV) related to the frequency resource allocation in the SCI of slot #2.

[0672] Subchannel #1

[0673] Subchannels #0, #1, and #2

[0674] For example, of the above-mentioned 2-slot frequency resources notified in slot #2, the subchannel #1 corresponds to the slots #0, #20, #40,..., which are the primary transmission resources spaced 20 ms apart from the slot (e.g., slot #0) corresponding to the retransmission resource of slot #2. In addition, of the above-mentioned 2-slot frequency resources notified in slot #2, the subchannels #0, #1, and #2 correspond to the slots #2, #22, #42,..., which are the retransmission resources spaced 20 ms apart from slot #2.

[0675] In other words, in the above-mentioned 2-slot frequency resources notified in slot #2 (at the time of retransmission), the frequency resources of 2 slots notified in slot #0 (at the time of primary transmission) are the same, for example. Figure 26

[0676] In addition, in Action Example 7-3, the TBS can be calculated, for example, in accordance with the amount of primary transmission resources, can be calculated in accordance with the amount of retransmission resources, or can be predetermined. Alternatively, the TBS can be calculated, for example, in accordance with the larger amount of resources between the primary transmission resources and the retransmission resources.

[0677] Further, the allocation of the above-mentioned 2-slot frequency resources (e.g., subchannels) is an example, and the allocation of other subchannels can also be used. In addition, the number of slots of the frequency resources notified by 1 SCI is not limited to 2 slots, and the number of other slots can also be used.

[0678] [Action Example 7-4]

[0679] In Action Example 7-4, 1 setting is selected (in other words, notified) from among the settings (e.g., frequency resource patterns) of the frequency resource allocation in the plurality of time resources by the SCI.

[0680] Further, the plurality of settings (in other words, the plurality of patterns) of the frequency resource allocation can be specified in the specification (or the standard), can be set in the SIM, can be set in the application layer called "pre-configuration", can be set in the upper layer such as the SIB or other RRC called "configuration", or can be set in the MAC, for example.

[0681] Figure 26 An example of 4 patterns (Pattern A, Pattern B, Pattern C, and Pattern D) of the frequency resource allocation is shown. Figure 27 ​The 4 patterns shown each include allocation of frequency resources of, for example, 4 slots.

[0682] The terminal 400 can notify the receiving terminal of the selected one of the 4 patterns, for example, by SCI (e.g., 2 bits of information).

[0683] According to Action Example 7-4, since the configuration of the allocation of frequency resources of multiple slots can be notified by the pattern, the number of notification bits in the SCI can be reduced compared to the case where the allocation of frequency resources of each of the multiple slots is separately notified.

[0684] In addition, the terminal 400 can notify, for example, by the SCI, the slot in which the SCI is transmitted, and the correspondence of the slot to the pattern. Figure 27 The correspondence of the slots shown from the first slot to the fourth slot is notified.

[0685] For example, in the slot in which the SCI is transmitted, in the case where slot #0 as the current slot corresponds to pattern A, the following allocation is sequentially made from the current slot (slot #0). Figure 27 In the case where the third slot is notified as the pattern B with an interval of 20 ms, the following allocation is sequentially made from the current slot (third slot).

[0686] Slot #0: Subchannels #3, #4 (third slot)

[0687] Slot #20: Subchannels #3, #4 (fourth slot)

[0688] Slot #40: Subchannels #1, #2 (first slot)

[0689] Slot #60: Subchannels #1, #2 (second slot)

[0690] The receiving terminal can specify the frequency resources in the multiple slots, for example, based on the information indicating the pattern, and the information indicating the association of the slots included in the pattern to the slot in which the SCI is transmitted.

[0691] For example, by making the correspondence of the slot in which the SCI is transmitted to the pattern different, the frequency allocation can be set in a round-robin manner. Figure 27 Figure 27

[0692] Further, the above-described allocation of frequency resources (e.g., subchannels) of 4 slots is an example, and allocation of other subchannels can also be used. In addition, the number of slots of the frequency resources that can be notified by 1 SCI is not limited to 4 slots, and other numbers of slots can also be used. In addition, the number of patterns is not limited to 4 patterns, and other numbers of patterns can also be used.

[0693] The above describes Action Examples 7-1 to 7-4, respectively.

[0694] The above describes each of the embodiments of the present disclosure.

[0695] ​(Other embodiments)

[0696] (1) In Embodiments 1 to 3 regarding the time resource setting, the information related to the interval can be included in the first SCI, for example. If the information related to the interval is included in the first SCI, other terminals different from the receiving terminal can also easily receive (in other words, monitor or sense) the SCI, so it is easy to grasp the interval of the transmission time, and resource collision can be reduced.

[0697] Alternatively, in Embodiments 1 to 3 described above, the information related to the interval can be included in the second SCI, for example. If the information related to the interval is included in the second SCI, the increase in the number of bits of the first SCI can be suppressed, and the communicable distance specified by the first SCI can be increased.

[0698] (2) In Embodiments 4 to 7 regarding the frequency resource setting, for example, in the case of applying to transmission in unreserved resources (e.g., initial transmission), if the PSSCH is not configured or the PSSCH is configured for a part of the reserved frequency resources, it has a significant effect. Therefore, the above-described embodiments can also be applied, for example, at the time of initial transmission of a TB, or in the case of transmitting the SCI of the first reserved resource.

[0699] (3) In V2X, for example, due to the above-described half-duplex problem, it is also possible for other terminals to transmit a signal in the resources reserved by the terminal. Therefore, in Embodiments 4 to 7 regarding the frequency resource setting, even after the reservation of the resources, if the PSSCH is not configured or the PSSCH is configured for a part of the reserved frequency resources, it is also effective in order to avoid collision with the transmission resources of other terminals. Therefore, the above-described embodiments can also be applied, for example, not limited to the time of initial transmission, at the time of retransmission, or at the time of initial transmission of the next TB after the reservation of the resources.

[0700] (4) In one embodiment of the present disclosure, the maximum number of resources reserved by the terminal at the same time can also be limited to a certain specific number, such as 2, 4, 8, etc. In addition, in this maximum value, for example, a fixed value can be defined on the specification (or specification), can be set (pre-configured) on the application layer, and can also be set (configured) on the upper layer (e.g., MAC), etc.

[0701] (5) The terminal that transmits and receives in the sidelink can include, for example, a terminal that performs transmission processing without performing reception processing, a terminal that performs reception processing without performing transmission processing, or a terminal that performs both transmission and reception.

[0702] (6) In a case where the settings regarding the sidelink are preset in the terminal 200, 400, the settings regarding the sidelink can be set in a specification (e.g., a standard), can be set in an application layer called "pre-configuration", can be set in a SIM possessed by the terminal 200, 400, can be set in a SIB or other RRC upper layer called "configuration", or can be set in a MAC.

[0703] (7) In each of the above-described examples of actions, a continuous time slot is described, but the time slots can also be discontinuous in time. For example, an interval can be set using time slots included in a resource pool of the sidelink.

[0704] (8) One embodiment of the present disclosure is not limited to the sidelink communication (in other words, direct communication between a plurality of terminals), but can also be applied to the communication of the Uu link (in other words, communication between the base station 100, 300 and the terminal 200, 400). In this case, for example, the channel configuration in the sidelink described in each of the above-described embodiments can be replaced with a channel configuration in the Uu link. For example, the PSCCH can be replaced with a downlink data channel (PDCCH: Physical Downlink Control Channel), the PSSCH can be replaced with a downlink data channel (PDSCH: Physical Downlink Shared Channel) or an uplink data channel (PUSCH: Physical Uplink Shared Channel), the PSFCH can be replaced with an uplink control channel (PUCCH: Physical Uplink Control Channel), and the PSBCH can be replaced with a broadcast channel (PBCH: Physical Broadcast Channel).

[0705] (9) In the above-described embodiments, for the mode of the sidelink communication, for example, mode 2 can be set without setting mode 1. In a case where it is mode 2, the terminal 200, 400 can receive SCI transmitted by another terminal to avoid transmission using the same resource as that indicated by the SCI. For example, the terminal 200, 400 can share reservation information of a resource with another terminal by notifying the other terminal of an interval.

[0706] (10) The above-described examples of actions of the embodiments can be used in combination. For example, at least one of the embodiments 1 to 3 of the determination method regarding the time resource and at least one of the embodiments 4 to 7 of the determination method regarding the frequency resource can be combined to determine the time resource and the frequency resource.

[0707] (11) The unit of time resources is not limited to a time slot, and can be, for example, a frame, a subframe, a time slot, a sub-time slot, or a symbol, or another unit of time resources. In addition, the unit of frequency resources is not limited to a subchannel, and can be, for example, a BWP, a resource block (for example, a PRB), a resource block group (RBG), a subcarrier, or a resource element group (REG), or another unit of frequency resources.

[0708] 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-described embodiments can be partially or entirely realized as an LSI (Large Scale Integration), which is an integrated circuit, or one chip formed of a plurality of components. Each process described in the above-described embodiments can be controlled by the LSI as a whole or in part. The LSI can be constituted of a single chip or a plurality of chips. The LSI can also include a data input unit and a data output unit. The LSI can be referred to as "IC" (Integrated Circuit), "system LSI" (System Large Scale Integration), "super LSI" (Super Large Scale Integration), or "ultra LSI" (Ultra Large Scale Integration) depending on the degree of integration.

[0709] The method of integration is not limited to the LSI, and can be realized by a dedicated circuit, a general-purpose processor, or a special-purpose processor. In addition, a FPGA (Field Programmable Gate Array) that can be programmed after the manufacture of the LSI, or a reconfigurable processor in which the connections and the settings of circuit cells disposed inside the LSI can be reconfigured can be used. The present disclosure can also be realized as digital processing or analogue processing.

[0710] Further, if a technology replacing LSI emerges as a result of advancement in semiconductor technology or other technologies, the functional blocks can of course be integrated using this technology. The possibility of applying biotechnology also exists.

[0711] The present disclosure can be implemented in all kinds of apparatuses, devices, systems (collectively referred to as "communication apparatuses") having a communication function. The communication apparatuses can also include a wireless transceiver and a processing / control circuit. The wireless transceiver can also include a reception section and a transmission section, or function as these sections. The wireless transceiver (transmission section, reception section) can also include an RF (Radio Frequency) module and one or more antennas. The RF module can also include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of the communication apparatuses include a telephone (handset, smartphone, etc.), a tablet, a personal computer (PC) (laptop, desktop, notebook, etc.), a camera (digital still / video camera, etc.), a digital player (digital audio / video player, etc.), a wearable device (wearable camera, smartwatch, tracking device, etc.), a game machine, an electronic book reader, a remote health / telemedicine (remote health / medical prescription) device, a vehicle or transportation tool (car, airplane, ship, etc.) with a communication function, and a combination of the above various apparatuses.

[0712] The communication apparatuses are not limited to portable or movable apparatuses, and include all kinds of apparatuses, devices, systems that cannot be carried or are fixed. For example, smart home devices (home appliance devices, lighting devices, smart meters or meters, control panels, etc.), vending machines, and other "Things" that can exist on an IoT (Internet of Things) network.

[0713] The communication includes not only data communication through a cellular system, a wireless LAN (Local Area Network) system, a communication satellite system, etc., but also data communication through a combination of these systems.

[0714] In addition, the communication apparatuses include devices such as controllers or sensors connected or linked to communication devices that perform the communication functions described in the present disclosure. For example, controllers or sensors that generate control signals or data signals used by communication devices that perform the communication functions of the communication apparatuses.

[0715] In addition, the communication apparatuses include infrastructure devices such as base stations, access points, and other apparatuses, devices, systems that communicate with or control the above-described various apparatuses.

[0716] A terminal of one embodiment of the present disclosure includes control circuitry that decides first information and second information, the first information including a second value obtained by dividing an interval of a time resource reserved by a first value, the second information indicating one of candidates of at least one of an association of the second value with the first information and the first value in a case where there are a plurality of candidates of the at least one, and transmission circuitry that transmits the first information and the second information.

[0717] In one embodiment of the present disclosure, the second information indicates one of candidates of the first value.

[0718] In one embodiment of the present disclosure, the second information indicates one of candidates of the association.

[0719] In one embodiment of the present disclosure, the second information is information indicating a data priority, the priority being associated with the candidate of the at least one.

[0720] In one embodiment of the present disclosure, the second information is information indicating a redundancy version, the redundancy version being associated with the candidate of the at least one.

[0721] In one embodiment of the present disclosure, the second information includes information indicating a redundancy version and information indicating a transmission type of one of initial transmission and retransmission of data, a combination of the redundancy version and the transmission type being associated with the candidate of the at least one.

[0722] In one embodiment of the present disclosure, the second information is information indicating a retransmission process number, the retransmission process number being associated with the at least one candidate.

[0723] In one embodiment of the present disclosure, the interval is a time interval between data adjacent in the time domain in data with which the terminal performs communication.

[0724] In one embodiment of the present disclosure, the interval is a time interval between a retransmission timing of first data and an initial transmission timing of second data transmitted after the first data.

[0725] A terminal of one embodiment of the present disclosure includes reception circuitry that receives first information and second information, the first information including a second value obtained by dividing an interval of a time resource reserved by a first value, the second information indicating one of candidates of at least one of an association of the second value with the first information and the first value in a case where there are a plurality of candidates of the at least one, and control circuitry that decides the first information and the second information.

[0726] In a communication method of one embodiment of the present disclosure, a terminal performs the following steps: deciding first information and second information, the first information including a second value obtained by dividing an interval of a time resource to be reserved by a first value, the second information indicating one of candidates of at least one of the association of the second value with the first information and the first value in a case where there are a plurality of candidates of the at least one; and transmitting the first information and the second information.

[0727] In a communication method of one embodiment of the present disclosure, a terminal performs the following steps: receiving first information and second information, the first information including a second value obtained by dividing an interval of a time resource to be reserved by a first value, the second information indicating one of candidates of at least one of the association of the second value with the first information and the first value in a case where there are a plurality of candidates of the at least one; and deciding the interval on the basis of the first information and the second information.

[0728] The disclosure of Japanese Patent Application No. 2019-184039 filed on October 4, 2019, including the specification, drawings and abstract, is incorporated herein by reference in its entirety.

[0729] Industrial Applicability

[0730] One embodiment of the present disclosure is useful for a mobile communication system.

[0731] Explanation of Reference Signs

[0732] 100, 300 base station

[0733] 101, 208 interval setting section

[0734] 102, 209, 302, 409 resource pool setting section

[0735] 103, 303 error correction encoding section

[0736] 104, 304 modulation section

[0737] 105, 215, 305, 415 signal distribution section

[0738] 106, 216, 306, 416 transmission section

[0739] 107, 201, 307, 401 reception section

[0740] 108, 202, 308, 402 signal separation section

[0741] 109, 309 demodulation section

[0742] 110, 310 error correction decoding section

[0743] 200, 400 terminal

[0744] 203, 403 SCI receiving section

[0745] 204, 404 Uu demodulating section

[0746] 205, 405 Uu error correction decoding section

[0747] 206, 406 SL demodulating section

[0748] 207, 407 SL error correction decoding section

[0749] 210, 410 SCI generating section

[0750] 211, 411 Uu error correction encoding section

[0751] 212, 412 Uu modulating section

[0752] 213, 413 SL error correction encoding section

[0753] 214, 414 SL modulating section

[0754] 301, 408 frequency resource size setting section

Claims

1. A communication device, characterized by Possessing: a circuit that sets one resource reservation time among a plurality of resource reservation time candidates indicated by higher layer signaling for each resource pool; and a transmitter that transmits the set resource reservation time in sidelink control information (SCI), information of the set resource reservation time is transmitted through a first stage SCI of the SCI, a number of information bits included in the SCI differs according to a number of the plurality of resource reservation time candidates.

2. The communication apparatus according to claim 1, wherein in a case where information of the set resource reservation time is transmitted through the first stage SCI of the SCI, the set resource reservation time is equal to or greater than a threshold value.

3. The communication apparatus according to claim 1, wherein the circuit determines N frequency resources reserved for N time resources, the N frequency resources being different from each other, the transmitter transmits frequency information about the N frequency resources on the same SCI, and a value of N is determined from a set of values and is indicated by higher layer signaling.

4. The communication apparatus according to claim 1, wherein the SCI is included in a physical sidelink control channel (PSCCH), the SCI is used for scheduling of a physical sidelink shared channel (PSSCH).

5. The communication apparatus according to claim 4, wherein the circuit sets a time resource allocation in the SCI, the time resource allocation indicating time resources of the PSSCH.

6. The communication apparatus according to claim 1, wherein the plurality of resource reservation time candidates are dynamically changed by higher layer signaling.

7. The communication apparatus according to claim 1, wherein a time unit of the resource reservation time is converted into a slot unit.

8. The communication apparatus according to claim 1, wherein the SCI includes a new data indicator indicating further transmission or retransmission of data.

9. A communication method characterized by comprising: including: a step of setting one resource reservation time among a plurality of resource reservation time candidates indicated by higher layer signaling for each resource pool; and a step of transmitting the set resource reservation time in sidelink control information (SCI), information of the set resource reservation time is transmitted through a first stage SCI of the SCI, a number of information bits included in the SCI differs according to a number of the plurality of resource reservation time candidates. ​

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