WO2017176098A1 - Procédé de sélection de ressource à utiliser pour effectuer une communication v2x sur une plage respectant une condition de latence dans un système de communication sans fil, et terminal mettant en oeuvre ce procédé - Google Patents

Procédé de sélection de ressource à utiliser pour effectuer une communication v2x sur une plage respectant une condition de latence dans un système de communication sans fil, et terminal mettant en oeuvre ce procédé Download PDF

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Publication number
WO2017176098A1
WO2017176098A1 PCT/KR2017/003845 KR2017003845W WO2017176098A1 WO 2017176098 A1 WO2017176098 A1 WO 2017176098A1 KR 2017003845 W KR2017003845 W KR 2017003845W WO 2017176098 A1 WO2017176098 A1 WO 2017176098A1
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WIPO (PCT)
Prior art keywords
resource
value
transmission
terminal
sensing
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PCT/KR2017/003845
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English (en)
Korean (ko)
Inventor
이승민
서한별
채혁진
김영태
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엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to EP17779398.1A priority Critical patent/EP3432657B1/fr
Priority to US16/091,891 priority patent/US20190110177A1/en
Priority to EP21189542.0A priority patent/EP3923647B1/fr
Priority to KR1020187028578A priority patent/KR102158628B1/ko
Publication of WO2017176098A1 publication Critical patent/WO2017176098A1/fr
Priority to US16/362,007 priority patent/US10536826B2/en
Priority to US18/098,413 priority patent/US20230156442A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to wireless communication, and more particularly, to a V2X transmission resource selection method performed by a terminal in a wireless communication system and a terminal using the method.
  • ITU-R International Telecommunication Union Radio communication sector
  • IP Internet Protocol
  • 3rd Generation Partnership Project is a system standard that meets the requirements of IMT-Advanced.
  • Long Term Evolution is based on Orthogonal Frequency Division Multiple Access (OFDMA) / Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmission.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • LTE-A LTE-Advanced
  • LTE-A is one of the potential candidates for IMT-Advanced.
  • D2D Device-to-Device
  • D2D is drawing attention as a communication technology for a public safety network.
  • Commercial communication networks are rapidly changing to LTE, but current public safety networks are mainly based on 2G technology in terms of cost and conflict with existing communication standards. This gap in technology and the need for improved services have led to efforts to improve public safety networks.
  • V2X VEHICLE-TO-EVERYTHING
  • PEDESTRIAN COMPUNICATION BETWEEN A VEHICLE AND A DEVICE CARRIED BY AN INDIVIDUAL (e.g., HANDHELD TERMINAL CARRIED BY A PEDESTRIAN, CYCLIST, DRIVER OR PASSENGER)
  • VEHICLE COMPUNICATION BETWEEN VEHICLES
  • INFRASTRUCTURE / NETWORK COMMUNICATION BETWEEN A VEHICLE AND A ROADSIDE UNIT (RSU) / NETWORK (e.g.) OR A STATIONARY UE)) (V2I / N).
  • a device possessed by a pedestrian (or person) is named "P-UE", and a device installed in a vehicle VEHICLE (V2X communication) is named "V-UE”.
  • V-UE a device installed in a vehicle VEHICLE (V2X communication)
  • the term 'entity' may be interpreted as at least one of P-UE, V-UE, and RSU (/ NETWORK / INFRASTRUCTURE).
  • V2X communication it may be a question of how and what resource to select when the P-UE tries to transmit the V2X signal.
  • P-UE has a feature that is sensitive to battery consumption, unlike the terminal installed in the vehicle.
  • V2X communication it may be important to transmit a signal periodically and not to interfere with other terminals. In view of these points, it is necessary to determine a transmission resource selection method of the P-UE.
  • the technical problem to be solved by the present invention is to provide a V2X transmission resource selection method performed by a terminal in a wireless communication system and a terminal using the same.
  • V2X vehicle-to-X
  • selecting a resource for performing V2X communication within a range that satisfies a latency request, and A method for performing V2X communication based on the selected resource is provided.
  • the V2X terminal may select the resource by configuring a selection window within a range that satisfies the latency request.
  • the V2X communication may be performed in units of a plurality of subchannels, and a resource for performing the V2X communication may be selected based on sensing performed in a unit of a subchannel having a size corresponding to the size of the plurality of subchannels. .
  • the sensing area used when the sensing is performed may be an area having a size corresponding to the sizes of the plurality of subchannels.
  • the V2X terminal may perform sensing by using an energy measurement average value of the subchannels included in the plurality of subchannels.
  • a unit of a subchannel having a size corresponding to the size of a subchannel used for V2X message transmission And sensing a resource to perform the V2X message transmission and performing the V2X message transmission based on the selected resource.
  • the V2X terminal may select the resource by configuring a selection window within a range that satisfies the latency request.
  • the sensing area used when the sensing is performed may be an area having a size corresponding to the sizes of the plurality of subchannels.
  • the V2X terminal may perform sensing by using an energy measurement average value of the subchannels included in the plurality of subchannels.
  • a user equipment includes a Radio Frequency (RF) unit for transmitting and receiving a radio signal and a processor operating in conjunction with the RF unit, wherein the processor, A terminal for selecting a resource for performing vehicle-to-X (V2X) communication within a range satisfying a latency request, and performing a V2X communication based on the selected resource.
  • RF Radio Frequency
  • the terminal when the terminal performs the V2X communication, it is possible to efficiently reserve resources for the V2X communication. Accordingly, since the terminal according to the present invention can efficiently use the radio resources, the occupation of unnecessary radio resources is minimized, thereby maximizing the efficiency of radio communication.
  • FIG. 1 illustrates a wireless communication system to which the present invention can be applied.
  • FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
  • FIG. 3 is a block diagram illustrating a radio protocol structure for a control plane.
  • FIG 5 shows examples of arrangement of terminals and cell coverage for ProSe direct communication.
  • FIG. 6 shows a user plane protocol stack for ProSe direct communication.
  • FIG. 8 is a flowchart illustrating a method of performing V2X communication based on a terminal specific sensing interval according to an embodiment of the present invention.
  • FIG. 9 illustrates a schematic example of a terminal specific sensing window.
  • FIG. 10 is a flowchart illustrating a method of configuring a selection window according to an embodiment of the present invention.
  • 13 and 14 illustrate re-scheduled (/ selected) resource determination and (V2X MESSAGE) transmission immediately based on the rescheduled (/ selected) resource.
  • 15 and 16 illustrate 'control (/ scheduling) information' and 'data (associated with the corresponding control (/ scheduling) information)' (in terms of 'SINGLE V2X UE') transmitted in the form of 'FDM' on the same SF. An example of the case is shown.
  • FIG. 17 shows an example of a case where the 'control (/ scheduling) information transmission pool' and the 'data transmission pool' are set (/ configured) in the 'FDM' form (from a system perspective).
  • FIG. 18 is a flowchart illustrating a method of performing sensing when a number of subchannels used for V2X message transmission is plural, according to an embodiment of the present invention.
  • FIG. 19 illustrates an example of ENERGY MEASUREMET (ie, sensing) performed with a subchannel size of data to be transmitted by a UE.
  • 20 and 21 illustrate an example of a form of 'PARTIALLY OVERLAPPED REGION BASED SENSING' (or 'SLIDING WINDOW BASED SENSING').
  • FIG. 22 schematically illustrates an example in which the problem of “SFN (SYSTEM FRAME NUMBER) WRAP AROUND” occurs.
  • 23 is a flowchart of a method for reserving a finite number of resources according to an embodiment of the present invention.
  • 24 is a flowchart illustrating a method for reselecting a resource by a terminal according to an embodiment of the present invention.
  • 25 is an example of a method of performing resource reservation in consideration of the above-mentioned proposal.
  • FIG. 26 is a flowchart of a method of excluding a subframe (in a selection window) related to a subframe in which a terminal does not perform sensing according to an embodiment of the present invention.
  • FIG. 27 illustrates an example of excluding a subframe (in a selection window) related to a subframe in which the terminal has not performed sensing.
  • Figure 31 shows an example of the case of increasing the (old) "DFN RANGE” value (for example, "10240" or "10176").
  • FIG. 34 is a flowchart of a method of performing V2X communication on an allocated V2X resource pool according to an embodiment of the present invention.
  • 35 schematically illustrates an example in which an SLSS subframe is excluded from a V2X transmission.
  • FIG. 36 schematically illustrates an example in which DL and S (SPECIAL) subframes are excluded from a V2X transmission.
  • FIG. 37 is a flowchart illustrating a method for performing reservation for a V2X transmission resource when resource reservation of a short period is set according to an embodiment of the present invention.
  • 38 is a flowchart illustrating a method for performing sensing in a relatively short period when resource reservation of a short period is set according to an embodiment of the present invention.
  • 39 is a block diagram illustrating a terminal in which an embodiment of the present invention is implemented.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
  • the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
  • the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like.
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
  • S-GW Serving Gateway
  • MME Mobility Management Entity
  • EPC Evolved Packet Core
  • EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
  • the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
  • S-GW is a gateway having an E-UTRAN as an endpoint
  • P-GW is a gateway having a PDN as an endpoint.
  • Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
  • L2 second layer
  • L3 third layer
  • the RRC Radio Resource Control
  • the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
  • FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
  • 3 is a block diagram illustrating a radio protocol structure for a control plane.
  • the user plane is a protocol stack for user data transmission
  • the control plane is a protocol stack for control signal transmission.
  • a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
  • the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
  • MAC medium access control
  • the physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
  • the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
  • RLC Radio Link Control
  • RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
  • QoS Quality of Service
  • the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
  • TM transparent mode
  • UM unacknowledged mode
  • Acknowledged Mode acknowledged mode
  • AM Three modes of operation (AM).
  • AM RLC provides error correction through an automatic repeat request (ARQ).
  • the RRC (Radio Resource Control) layer is defined only in the control plane.
  • the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
  • RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
  • PDCP Packet Data Convergence Protocol
  • Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
  • the functionality of the Packet Data Convergence Protocol (PDCP) layer in the control plane includes the transfer of control plane data and encryption / integrity protection.
  • the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
  • RB can be further divided into SRB (Signaling RB) and DRB (Data RB).
  • SRB is used as a path for transmitting RRC messages in the control plane
  • DRB is used as a path for transmitting user data in the user plane.
  • the UE If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.
  • the downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages.
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
  • RACH random access channel
  • SCH uplink shared channel
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic
  • the physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain.
  • One sub-frame consists of a plurality of OFDM symbols in the time domain.
  • the RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
  • Transmission Time Interval is a unit time of subframe transmission.
  • ProSe proximity based services
  • ProSe has ProSe communication and ProSe direct discovery.
  • ProSe direct communication refers to communication performed between two or more neighboring terminals.
  • the terminals may perform communication using a user plane protocol.
  • ProSe-enabled UE refers to a terminal that supports a procedure related to the requirements of ProSe.
  • ProSe capable terminals include both public safety UEs and non-public safety UEs.
  • the public safety terminal is a terminal that supports both a public safety-specific function and a ProSe process.
  • a non-public safety terminal is a terminal that supports a ProSe process but does not support a function specific to public safety.
  • ProSe direct discovery is a process for ProSe capable terminals to discover other ProSe capable terminals that are adjacent to each other, using only the capabilities of the two ProSe capable terminals.
  • EPC-level ProSe discovery refers to a process in which an EPC determines whether two ProSe capable terminals are in proximity and informs the two ProSe capable terminals of their proximity.
  • ProSe direct communication may be referred to as D2D communication
  • ProSe direct discovery may be referred to as D2D discovery.
  • a reference structure for ProSe includes a plurality of terminals including an E-UTRAN, an EPC, a ProSe application program, a ProSe application server, and a ProSe function.
  • EPC represents the E-UTRAN core network structure.
  • the EPC may include MME, S-GW, P-GW, policy and charging rules function (PCRF), home subscriber server (HSS), and the like.
  • PCRF policy and charging rules function
  • HSS home subscriber server
  • ProSe application server is a user of ProSe ability to create application functions.
  • the ProSe application server may communicate with an application program in the terminal.
  • An application program in the terminal may use a ProSe capability for creating an application function.
  • the ProSe function may include at least one of the following, but is not necessarily limited thereto.
  • PC1 This is a reference point between a ProSe application in a terminal and a ProSe application in a ProSe application server. This is used to define signaling requirements at the application level.
  • PC2 Reference point between ProSe application server and ProSe function. This is used to define the interaction between the ProSe application server and ProSe functionality. An application data update of the ProSe database of the ProSe function may be an example of the interaction.
  • PC3 Reference point between the terminal and the ProSe function. Used to define the interaction between the UE and the ProSe function.
  • the setting for ProSe discovery and communication may be an example of the interaction.
  • PC4 Reference point between the EPC and ProSe functions. It is used to define the interaction between the EPC and ProSe functions. The interaction may exemplify when establishing a path for 1: 1 communication between terminals, or when authenticating a ProSe service for real time session management or mobility management.
  • PC5 Reference point for using the control / user plane for discovery and communication, relay, and 1: 1 communication between terminals.
  • PC6 Reference point for using features such as ProSe discovery among users belonging to different PLMNs.
  • SGi can be used for application data and application level control information exchange.
  • ProSe direct communication is a communication mode that allows two public safety terminals to communicate directly through the PC 5 interface. This communication mode may be supported both in the case where the terminal receives service within the coverage of the E-UTRAN or in the case of leaving the coverage of the E-UTRAN.
  • FIG 5 shows examples of arrangement of terminals and cell coverage for ProSe direct communication.
  • UEs A and B may be located outside cell coverage.
  • UE A may be located within cell coverage and UE B may be located outside cell coverage.
  • UEs A and B may both be located within a single cell coverage.
  • UE A may be located within the coverage of the first cell and UE B may be located within the coverage of the second cell.
  • ProSe direct communication may be performed between terminals in various locations as shown in FIG.
  • IDs may be used for ProSe direct communication.
  • Source Layer-2 ID This ID identifies the sender of the packet on the PC 5 interface.
  • Destination Layer-2 ID This ID identifies the target of the packet on the PC 5 interface.
  • SA L1 ID This ID is the ID in the scheduling assignment (SA) in the PC 5 interface.
  • FIG. 6 shows a user plane protocol stack for ProSe direct communication.
  • the PC 5 interface is composed of a PDCH, RLC, MAC, and PHY layers.
  • the MAC header may include a source layer-2 ID and a destination layer-2 ID.
  • a ProSe capable terminal can use the following two modes for resource allocation for ProSe direct communication.
  • Mode 1 is a mode for scheduling resources for ProSe direct communication from a base station.
  • the UE In order to transmit data in mode 1, the UE must be in an RRC_CONNECTED state.
  • the terminal requests the base station for transmission resources, and the base station schedules resources for scheduling allocation and data transmission.
  • the terminal may transmit a scheduling request to the base station and may transmit a ProSe BSR (Buffer Status Report). Based on the ProSe BSR, the base station determines that the terminal has data for ProSe direct communication and needs resources for this transmission.
  • ProSe BSR Buffer Status Report
  • Mode 2 is a mode in which the terminal directly selects a resource.
  • the terminal selects a resource for direct ProSe direct communication from a resource pool.
  • the resource pool may be set or predetermined by the network.
  • the terminal when the terminal has a serving cell, that is, the terminal is in the RRC_CONNECTED state with the base station or located in a specific cell in the RRC_IDLE state, the terminal is considered to be within the coverage of the base station.
  • mode 2 may be applied. If the terminal is in coverage, mode 1 or mode 2 may be used depending on the configuration of the base station.
  • the terminal may change the mode from mode 1 to mode 2 or from mode 2 to mode 1 only when the base station is configured.
  • ProSe direct discovery refers to a procedure used by a ProSe capable terminal to discover other ProSe capable terminals, and may also be referred to as D2D direct discovery or D2D discovery. At this time, the E-UTRA radio signal through the PC 5 interface may be used. Information used for ProSe direct discovery is referred to as discovery information hereinafter.
  • the PC 5 interface includes a MAC layer, a PHY layer, and a higher layer, ProSe Protocol layer.
  • the upper layer deals with the authorization of discovery information and monitoring, and the content of the discovery information is transparent to the access stratum (AS). )Do.
  • the ProSe Protocol ensures that only valid discovery information is sent to the AS for the announcement.
  • the MAC layer receives discovery information from a higher layer (ProSe Protocol).
  • the IP layer is not used for sending discovery information.
  • the MAC layer determines the resources used to announce the discovery information received from the upper layer.
  • the MAC layer creates a MAC protocol data unit (PDU) that carries discovery information and sends it to the physical layer.
  • PDU MAC protocol data unit
  • the base station provides the UEs with a resource pool configuration for discovery information announcement.
  • This configuration may be included in a system information block (SIB) and signaled in a broadcast manner.
  • SIB system information block
  • the configuration may be provided included in a terminal specific RRC message.
  • the configuration may be broadcast signaling or terminal specific signaling of another layer besides the RRC message.
  • the terminal selects a resource from the indicated resource pool by itself and announces the discovery information using the selected resource.
  • the terminal may announce the discovery information through a randomly selected resource during each discovery period.
  • the UE in the RRC_CONNECTED state may request a resource for discovery signal announcement from the base station through the RRC signal.
  • the base station may allocate resources for discovery signal announcement with the RRC signal.
  • the UE may be allocated a resource for monitoring the discovery signal within the configured resource pool.
  • the base station 1) may inform the SIB of the type 1 resource pool for discovery information announcement.
  • ProSe direct UEs are allowed to use the Type 1 resource pool for discovery information announcement in the RRC_IDLE state.
  • the base station may indicate that the base station supports ProSe direct discovery through 2) SIB, but may not provide a resource for discovery information announcement. In this case, the terminal must enter the RRC_CONNECTED state for the discovery information announcement.
  • the base station may set whether the terminal uses a type 1 resource pool or type 2 resource for discovery information announcement through an RRC signal.
  • the D2D operation may have various advantages in that it transmits and receives signals between adjacent devices.
  • the D2D user equipment has a high data rate and low delay and can perform data communication.
  • the D2D operation may distribute traffic that is driven to the base station, and may also serve to extend the coverage of the base station if the terminal performing the D2D operation serves as a relay.
  • the above-mentioned extension of D2D communication, including the transmission and reception of signals between vehicles, is particularly referred to as V2X (VEHICLE-TO-X) communication.
  • V2X V2X
  • PEDESTRIAN COMPUNICATION BETWEEN A VEHICLE AND A DEVICE CARRIED BY AN INDIVIDUAL (example) HANDHELD TERMINAL CARRIED BY A PEDESTRIAN, CYCLIST, DRIVER OR PASSENGER)
  • V2P VEHICLE
  • V2V VEHICLE
  • INFRASTRUCTURE / NETWORK COMPIT
  • RSU ROADSIDE UNIT
  • RSU ROADSIDE UNIT
  • NETWORK example
  • a device (related to V2P communication) possessed by a pedestrian (or person) is called “P-UE", and a device (related to V2X communication) installed in VEHICLE is " V-UE ".
  • the term 'ENTITY' may be interpreted as P-UE and / or V-UE and / or RSU (/ NETWORK / INFRASTRUCTURE).
  • the V2X terminal may perform message (or channel) transmission on a predefined (or signaled) resource pool (RESOURCE POOL).
  • the resource pool may mean a predefined resource (s) to perform the V2X operation (or to perform the V2X operation).
  • the resource pool may be defined in terms of time-frequency, for example.
  • V2X transmission resource pool there may be various types of V2X transmission resource pool.
  • FIG. 6 illustrates the type of V2X transmission resource pool.
  • the V2X transmission resource pool #A may be a resource pool in which only (partial) sensing is allowed.
  • the terminal should select the V2X transmission resource after performing (partial) sensing, and random selection may not be allowed.
  • the V2X transmission resources selected by the (partial) sensing are held semi-statically at regular intervals as shown in FIG.
  • the base station may be configured to perform (partly) a sensing operation (based on scheduling allocation decoding / energy measurement). This may be interpreted as 'random selection' of transmission resources not allowed on the V2X transmission resource pool #A, and '(partial) sensing' based transmission resource selection (only) is performed (/ allowed). Can be interpreted as The setting may be made by the base station.
  • the V2X transmission resource pool #B may be a resource pool in which only random selection is allowed.
  • the UE may randomly select the V2X transmission resource in the selection window without performing (partial) sensing.
  • the selected resource may be set (/ signaled) so as not to be reserved semi-statically.
  • the base station may be configured such that the terminal does not perform a sensing operation (based on scheduling allocation decoding / energy measurement) to perform a V2X message transmission operation on the V2X transmission resource pool #B. This may be interpreted as transmission resource 'random selection' (only) is performed (/ allowed) and / or '(partial) sensing' based transmission resource selection is not allowed on the V2X transmission resource pool #B.
  • a resource pool capable of both (partial) sensing and random selection may also exist.
  • the base station may inform that it is possible to select V2X resources in this resource pool by either of the partial sensing and the random selection (by terminal implementation).
  • FIG. 7 illustrates a V2X transmission resource (re) selection (/ reservation) method according to a partial sensing operation.
  • a terminal may be determined (/ triggered) of (re) selecting (/ reserving) a resource for V2X signal transmission (according to whether a predefined condition is satisfied).
  • the UE may (re) select (reserve) a resource for V2X signal transmission in the subframe period from subframe # m + T1 to # m + T2.
  • the subframe section from the subframes # m + T1 to # m + T2 is hereinafter referred to as a selection window.
  • the selection window may consist of, for example, 100 consecutive subframes.
  • the UE may select at least Y subframes as candidate resources within the selection window. That is, the terminal may consider at least Y subframes as candidate resources in the selection window.
  • the Y value may be a preset value or a value set by a network.
  • how to select the Y subframes in the selection window may be a problem of the terminal implementation. That is, when the Y value is, for example, 50, the UE may select which 50 subframes from 100 subframes constituting the selection window. For example, the UE may select 50 subframes having an odd subframe number from the 100 subframes or select 50 subframes having an even subframe number. Alternatively, 50 subframes may be selected by an arbitrary rule.
  • the UE in order to (re) select (/ reserve) a specific subframe, for example, subframe #N (SF # N) from among the Y subframes as a V2X transmission subframe capable of transmitting a V2X signal, the UE It may be necessary to sense at least one subframe linked to or associated with subframe #N.
  • the (whole) subframe period defined for sensing is called a sensing window, and may be composed of, for example, 1000 subframes. That is, the sensing window may consist of 1000 milliseconds (ms) or 1 second.
  • the terminal may be a set of elements in the subframe # N-100 * k (where k is a range of [1, 10], and may be a value preset or set by a network). ) May sense subframes.
  • the k value is ⁇ 1, 3, 5, 7, 10 ⁇ . That is, the UE senses subframes # N-1000, # N-700, # N-500, # N-300, and # N-100 to determine whether subframe #N is being used by another V2X terminal (and / Alternatively, it is possible to estimate / determine whether there is a relatively high interference (or above a preset (/ signaled) threshold) on subframe #N) and select (finally) subframe #N accordingly. have. Since the walking terminal is more sensitive to battery consumption than the vehicle terminal, instead of sensing all subframes in the sensing window, only the partial subframes are sensed, that is, partial sensing.
  • STEP 1 With regard to PSSCH resource (re) selection, when all PSCCH / PSSCH transmissions have the same priority, priority may be considered as a selectable resource.
  • STEP 2 Meanwhile, the terminal may exclude resources based on at least one of SA decoding and additional conditions.
  • the terminal selects a V2X transmission resource after excluding a specific resource based on scheduling assignment and additional conditions.
  • a method of excluding resources based on the DM-RS received power of the PSSCH may be supported. That is, it excludes resources indicated or reserved (reserved) by the decoded scheduling assignment and resources whose PSSCH RSRP (reference signal received power) received from data resources associated with the scheduling assignment is greater than or equal to a threshold.
  • the PSSCH RSRP may be defined as a linear average of power distributions of resource elements (REs) carrying DM-RSs associated with the PSSCH in the physical resource blocks (PRBs) indicated by the PSCCH.
  • the PSSCH RSRP may be measured as a reference point for the antenna connection of the terminal.
  • the scheduling assignment may include a 3-bit PPPP field.
  • the threshold may be given in the form of a function for priority information.
  • the information may be dependent on the priority information of the transport block and the priority information of the decoded scheduling assignment.
  • the threshold may be given in units of [2 dBm] in the range of [ ⁇ 128 dBm] to [0 dBm]. A total of 64 thresholds can be preset.
  • the UE decodes the scheduling assignment in subframe # m + c within the sensing interval, and may assume that the same frequency resource is reserved (reserved) by the scheduling assignment in subframe # m + d + P * i.
  • P may be a value fixed to 100.
  • i may be selected in the range of [0, 1, ..., 10], which may be set or predetermined by a carrier specific network.
  • i 0 means no intention to reserve (reserve) frequency resources.
  • i may be set by a 10-bit bitmap or a 4-bit field within the scheduling assignment.
  • the terminal may exclude the candidate semi-static resource X.
  • I is the value of i signaled by the scheduling assignment.
  • the terminal increases the threshold (for example, 3 dB), and then excludes the resources again This process may be performed until the remaining resources are greater than 20% of the total resources in the selection window.
  • the total resources in the selection window mean resources that the terminal should consider as possible candidate resources.
  • the terminal may maintain the current resource with a probability p and reset the counter. That is, the resource may be reselected with probability 1-p.
  • the carrier-specific parameter p may be preset and may be set in the range of [0, 0.2, 0.4, 0.6, 0.8].
  • the UE measures the remaining PSSCH resources except for a specific resource and ranks based on the total received energy, and then selects a subset.
  • the subset may be a collection of candidate resources with the lowest received energy.
  • the size of the subset may be 20% of the total resources in the selection window.
  • the terminal may randomly select one resource from the subset.
  • the UE may select contiguous M subchannels, and an average of energy measured in each subchannel may be an energy measurement value of each resource.
  • one resource may be selected in which a mechanism defined for the case of TB transmitted in one subframe is used.
  • the selected resource must not be the same subframe as the first resource and must not be a subframe excluded from the resource selection.
  • the SCI should be able to indicate the time gap between two selected resources.
  • the TB may be transmitted using only the first resource.
  • STEP 3 The UE may select a V2X transmission resource among the resources not excluded.
  • the UE is not predicted that the mixed PSCCH is transmitted in different subframes.
  • the subchannel having the lowest index among those selected for data transmission may be used for SA transmission.
  • the number of SA candidate resources in the SA pool may be the same as the number of subchannels in the associated data pool. .
  • the SA resource associated with the lowest index among those selected for data transmission may be used for SA transmission.
  • TTI m may mean the reception time of the corresponding TB.
  • the terminal should consider possible candidate resources in the [m + T1, m + T2] interval.
  • the selected T2 must satisfy the latency requirement.
  • the resource pool may consist of one or a plurality of subchannels in the frequency domain.
  • the subchannel may be configured as a group of adjacent RBs in the same subframe.
  • the size of the subchannel in the resource pool may be set by the base station (e.g. eNB) or may have a preset value.
  • the candidate resource of the subchannel may mean ⁇ 5, 6, 10, 15, 20, 25, 50, 75, 100 ⁇ .
  • the resource pool may consist of one or a plurality of subchannels in the frequency domain.
  • the subchannel may be formed of a group of adjacent RBs in the same subframe.
  • the size of the subchannel in the resource pool may be set by the base station (e.g. eNB) or may have a preset value.
  • the number of subchannels may be up to 20, and the minimum candidate size may not have a value less than four.
  • the UE may select an integer number of adjacent subchannels for transmission, and the UE may not decode more than [100] RBs in one subframe. In addition, the UE may not decode more than [10] PSSCHs in one subframe.
  • SA pools and associated data pools may overlap.
  • SA pools and unassociated data pools may also overlap.
  • the resource pool may be configured of N consecutive PRBs in the frequency domain.
  • N may be equal to (size of subchannels * number of subchannels).
  • the V2V pool may be defined such that the bitmap is repeatedly mapped for all subframes except the skipped SLSS subframe.
  • the length of the bitmap may mean 16, 20, or 100.
  • the bitmap may mean defining which subframes are allowed for V2V SA / data transmission and / or reception for the pool.
  • the terminal may reselect resources related to all transmissions corresponding to the TB.
  • the SA may schedule transmission corresponding to one TB. It is also possible to apply the PSSCH-RSRP measured at the TTI that occurred prior to reception of the successfully decoded associated SA.
  • the transmission number of TB may mean 1 or 2.
  • each SA may indicate time / frequency resources of all data transmissions corresponding to the same TB.
  • the wording of “sensing” in the present invention is an RSRP measurement (for example, on a PSSCH scheduled by a PSCCH that successfully decodes) an RSRP measurement (referred to as a predefined signal) (REFERENCE SIGNAL ( RS ))
  • a predefined signal REFERENCE SIGNAL ( RS )
  • an S-RSRP operation and / or an energy measurement (e.g., S-RSSI) operation for a (sub) channel may be interpreted as a predefined (/ signaled) channel (e.g., PSCCH ( PHYSICAL SIDELINK CONTROL CHANNEL)).
  • PSCCH PHYSICAL SIDELINK CONTROL CHANNEL
  • the wording "DURATION" (and / or “section") may be extended to "RANGE (/ WINDOW)" (and / or "range”).
  • the boundary (/ position) of the time domain (/ section) in which the sensing operation is performed indicates the form (/ characteristic) of “UE-SPECIFIC ((TIME) BOUNDARY)”.
  • the boundary (/ location) of the time domain (/ section) in which a sensing operation (related to resource (re) reservation (/ selection)) of a specific V2X UE is performed is (V2X MESSAGE TX TIME) of the corresponding V2X UE. ( SF # K ) ”.
  • the V2X UE is a resource interval from "SF # (KD) to SF # K (or SF # (K-1-D) to SF # (K-1)) (here, one example) “ D ” stands for 'SENSING DURATION', which is predefined (/ signaled) ”, at (resource) time points other than (resource) time point at which the (real) V2X MESSAGE TX operation is performed. After performing the sensing operation, the V2X MESSAGE TX related resource (s) will be (re) reserved (/ selected) in the future.
  • the V2X UE skips (/ suspends) its (V2X MESSAGE) (last) transmission on 'SF # K' (if necessary) (according to predefined rules) and uses it Sensing (/ measure) up to (or previously reserved) resource (SF # K), determining optimal rescheduling (/ selecting) resources and / or based on rescheduling (/ selecting) resources (V2X MESSAGE) transmission) can be performed immediately.
  • the boundary of the time domain in which the sensing operation is performed (per V2X UE (S)) in the proposed rule # 1 is (shape / characteristic) of “UE-SPECIFIC (TIME) BOUNDARY”. This is described below.
  • FIG. 8 is a flowchart illustrating a method of performing V2X communication based on a terminal specific sensing interval according to an embodiment of the present invention.
  • the terminal may select a resource for performing V2X communication by performing sensing during a terminal specific sensing period (S810).
  • selecting a resource for V2X communication by performing a sensing during a specific period may include (A) a period in which the terminal performs sensing ( That is, the sensing window) is terminal specific, (B) the interval in which the terminal performs sensing is 1 second (that is, the interval corresponding to 1000 subframes, each subframe is 1MS interval).
  • One second may be described based on the viewpoint that the maximum SPS PERIOD (or maximum resource reservation (possible) period) length corresponds to the length (ie [N-1000, N-1]).
  • the terminal may select a resource for performing V2X communication by sensing, where the sensing interval may have a different sensing interval (ie, a terminal-specific sensing interval) for each terminal.
  • a different sensing interval ie, a terminal-specific sensing interval
  • having different sensing intervals for each terminal does not mean that the sensing time itself is different for each terminal, but may mean that the position of the sensing interval (that is, the sensing window) is different for each terminal.
  • the boundary of the time domain in which the sensing operation is performed may have a form (/ characteristic) of “UE-SPECIFIC (TIME) BOUNDARY”.
  • UE-SPECIFIC TIME
  • N value UE-SPECIFIC
  • FIG. 9 illustrates a schematic example of a terminal specific sensing window.
  • each of the terminals 'UE 1' and 'UE 2' may have a sensing window at different times, and there may be a sensing window for each terminal at different times.
  • subframe N when a request from a higher layer of the UE occurs in a specific subframe (hereinafter, subframe N), the UE determines a set of resources to be transmitted to the higher layer with respect to V2X message transmission (eg, PSSCH transmission). Can be.
  • V2X message transmission eg, PSSCH transmission
  • the terminal monitors a specific sensing period (except subframes N-1000, N-999, N-998, ..., N-1) (except for subframes in which transmission by the terminal occurs).
  • the UE monitors a specific sensing period (for example, subframes N-1000, N-999, ..., N-1) based on the subframe N determined by the upper layer of the UE itself. This means that a sensing window, which is a section in which a terminal performs monitoring, is determined by each terminal.
  • a sensing period ie, a sensing window
  • UE 1 may mean up to subframes N _UE1 -1000, N _UE1 -999, ..., N _UE1 -1, and the sensing window at this time is shown in FIG. Specific to UE 1 as shown in FIG. 9.
  • UE 2 it may be assumed that a request from an upper layer of UE 2 has occurred in N_UE2 .
  • a sensing period (ie, a sensing window) in UE 2 may mean up to subframes N_UE2 -1000, N_UE2 -999, ..., N_UE2 -1, and the sensing window at this time is shown in FIG. Specific to UE 2 as shown in FIG. 9.
  • the UE performs V2X communication based on the decoded PSCCH and the S-RSSI measured in the aforementioned subframes, that is, the subframes N-1000, N-999, N-998, ..., N-1.
  • a specific example of selecting a resource for the terminal to perform V2X communication is as described above.
  • the interval in which the UE performs sensing is 1 second (ie, 1000 subframe intervals), and the 1 second is the maximum SPS (SEMI-PERSISTENT SCHEDULING) PERIOD (or maximum resource reservation (possible) period) length (ie [N-1000, N-1]) will be described below.
  • a V2X UE is a group called 'SF # (N-A), SF # (N-A + 1),... , SF # (NB) (or SC PERIOD # (NA), SC PERIOD # (N-A + 1),..., SC PERIOD # (NB)) (A ⁇ B (e.g., 'B' (Result may be a positive integer greater than '0' in consideration of processing time for selection)) and the sensing result obtained by monitoring the interval of ('SF # N' where resource rescheduling (/ selection) is triggered).
  • V2X MESSAGE TX When used for resource (re) reservation (/ selection), “MONITORING WINDOW SIZE (ie '(AB)')” means resource (re) reservation It can also be set at the maximum of the time (/ selection) takes place (for example, interpreted as the interval of reserved resources (/ INTERVAL)).
  • the V2X UE is a 'SF # (N + C), SF # (N + C + 1), ...
  • SF # (N + D) (or SC PERIOD # (N + C), SC PERIOD # (N + C + 1),..., SC PERIOD # (N + D)) (D ⁇ C (e.g., 'C' value may be a positive integer greater than '0' in consideration of the processing time related to PSCCH / PSSCH generation) and selects its own transmission resource.
  • D ⁇ C e.g., 'C' value may be a positive integer greater than '0' in consideration of the processing time related to PSCCH / PSSCH generation
  • the '( AB) ' is interpreted as' 400MS' (for example, '400MS' minus one pre-defined (/ signaled) 'SC PERIOD (100MS)' (/ LATENCY REQUIREMENT) minus' 500MS '.
  • the '400MS' section may be interpreted as a section from 'SF # (N-500MS)' to 'SF # (N-100MS)'.
  • 'SENSING DURATION' can be a function of a predefined (/ set) 'resource (re) reservation (/ selection) period' (or 'resource (re))' It can be interpreted as performing a 'SENSING operation' during a time derived from the 'reservation (/ selection) period'.
  • a predefined (/ set) 'resource (re) reservation (/ selection) period' (or 'resource (re))' It can be interpreted as performing a 'SENSING operation' during a time derived from the 'reservation (/ selection) period'.
  • we will select (/ use) the same resource until 'rebooking' (/ selecting) the resource, so the sense of sensing the previous resource transfer ('rebooking (/ selecting)')
  • such a rule may be particularly useful when SA / DATA (POOL) is implemented in
  • the V2X UE (S) is linked to 'DATA (/ PSSCH) on' SF # (N + D) '(eg,' D ⁇ C ') in' SF # (N + C) '.
  • 'SF # N' refers to when the 'RESOURCE (RE) SELECTION' operation is performed (in accordance with a predefined rule (/ signaling)) and / or from 'SF # (NA)' to 'SF #'.
  • NB (e.g.,'A>B> 0 ') means' (SA (/ PSCCH) (' SF # (N + C) ') and / or DATA (/ PSSCH) (' SF # (N + D) '))
  • SA / PSCCH
  • DATA / PSSCH
  • RE RESOURCE
  • SELECTION' The sensing result referenced when performing RESOURCE (RE) SELECTION' may be assumed (/ interpreted) as an area in which (or sensing) is performed.
  • the field in which the 'value) is transmitted may be (newly) defined.
  • the '(EC)' value ( E_ CGAP ) (or the '(ED)' value ( E_ DGAP )) (or the 'E' value ( E_GAP )) is' SA (/ PSCCH) '(' SF # (N + C) ') Scheduling from the interval (or' SA (/ PSCCH) '(' SF # (N + C) ') between the transmission point and the' NEXT TB 'related (POTENTIAL) DATA (/ PSSCH)' transmission point Interval between 'DATA (/ PSSCH)' transmission time and 'NEXT TB' related (POTENTIAL) DATA (/ PSSCH) 'transmission time) or' V2X MESSAGE GENERATION (/
  • 'SENSING WINDOW SIZE' (eg, '(BA)') of the V2X UE may be determined (/ set) according to the below (some) rules.
  • the (maximum (/ minimum)) value related to 'E_CGAP' (or E_DGAP or E_GAP) is (from the network (or (serving) base station)) ('UE-COMMON' or 'UE-SPECIFIC') SINGLE VALUE 'or' MULTIPLE VALUE (S) '(/ signaled) or the V2X UE can be considered (/ assumed) to be the same as its (max (/ min))' MESSAGE GENERATION (/ TX) PERIODICITY '. have.
  • the 'SENSING WINDOW SIZE' is (A) 'E_CGAP' (or E_DGAP or E_GAP) related (maximum (/ minimum)) value and / or (B) (maximum (/ minimum)) 'MESSAGE GENERATION (/ Regardless of the value of TX) PERIODICITY ', it can be set to a predetermined value (/ signaled) in advance.
  • the (preset (/ signaled)) (relative) setting is performed even when the V2X UE performs a (relatively) long 'V2X MESSAGE' transmission of 'MESSAGE GENERATION (/ TX) PERIODICITY'.
  • 'SENSING WINDOW SIZE' may be set to 'UE-COMMON' (or 'UE-SPECIFIC').
  • (Rule #B) 'SENSING WINDOW SIZE' may be considered (/ determined) as a '(V2X) SPS PERIODICITY' value that has been previously set (/ signaled).
  • 'SPS CONFIGURATION (/ PROCESS)' having different 'SPS PERIODICITY' is set (/ signaled)
  • 'SENSING by' SPS CONFIGURATION (/ PROCESS) ' WINDOW SIZE ' may be interpreted as something else.
  • the SPS period may be determined as a resource reservation field in Sidelink Control Information (SCI) format 1, as shown in Table 1 below.
  • SCI Sidelink Control Information
  • the receiving terminal may determine the resource reservation period of the last transmission terminal (TX UE) based on the values that can be signaled in the RESOURCE RESERVATION field on the SCI FORMAT shown in Table 1.
  • the RX UE may determine the "resource reservation period candidate value" that the TX UE can set by multiplying the value of the resource reservation field by 100. For example, when the value of the resource reservation field is '0001', the resource reservation period value may be 100MS, and when the value of the resource reservation field is '0010', the resource reservation period value may be 200MS. Similarly, when the value of the resource reservation field is '1010', the resource reservation period value may be 1000MS.
  • the RX UE multiplies the value of the resource reservation field by 100 so that the “reservation period candidate value” that the TX UE can set is “20, 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000MS ”, and accordingly, the maximum value of the SPS period PERIOD may have a value of 1000MS (ie, 1s).
  • the interval in which the terminal performs sensing may have a maximum SPS (SEMI-PERSISTENT SCHEDULING) PERIOD (or maximum resource reservation (possible) period) length, and thus, the terminal
  • the interval for performing this sensing ie, the sensing window
  • the terminal may perform V2X communication based on the selected resource (S820). As described above (or described later), the terminal may select a subframe within a selection window based on the sensing result performed during the terminal specific sensing interval, and the terminal determines transmission reservation resources based on the selected subframe. And V2X communication on the reserved resource. Specific examples of performing V2X communication based on the resource selected by the terminal are as described above (or described later), and thus, detailed descriptions thereof will be omitted.
  • the end-to-end latency (LATENCY) must be considered. That is, when the terminal transmits the packet generated in the upper layer, not only the time for sending down the packet generated in the upper layer to the physical layer but also the time for the receiving terminal to receive the packet and then upload it to the upper layer of the receiving terminal. Should be. Accordingly, it is a matter of whether the terminal selects a resource for V2X message transmission, that is, how to configure the selection window (SELECTION WINDOW) to select the transmission resource.
  • SELECTION WINDOW selection window
  • FIG. 10 is a flowchart illustrating a method of configuring a selection window according to an embodiment of the present invention.
  • the UE may select a resource (or subframe, hereinafter, may be used to mix resources and subframes) for V2X communication within a range satisfying a latency request (LATENCY REQUIREMENT) (S1010). ).
  • the terminal may select the resource by configuring a selection window within a range that satisfies the latency request, the V2X communication is performed in units of a plurality of subchannels, the size of the plurality of subchannels
  • a resource for performing the V2X communication may be selected based on sensing performed in units of subchannels having a size corresponding to.
  • the sensing area used when the sensing is performed may be an area having a size corresponding to the sizes of the plurality of subchannels.
  • the terminal may perform sensing by using an energy measurement average value of the subchannels included in the plurality of subchannels.
  • the UE may select the resource by configuring a selection window within a range that satisfies the latency request, and when the V2X communication is performed in a plurality of subchannel units, a plurality of subchannel units Sensing may also be performed.
  • a plurality of subchannel units Sensing may also be performed.
  • the V2X communication is performed in units of a plurality of subchannels, a specific example of sensing in units of a plurality of subchannels will be described later.
  • the terminal selects a transmission resource within a range that satisfies the latency request.
  • the terminal may select a transmission resource (or subframe) (configuring SLECTION WINDOW) within a range that satisfies a latency request (LATENCY REQUIREMENT).
  • the UE has one set of contiguous subchannels (eg, L subCH ) in a V2X resource pool (eg, PSSCH resource pool) included within a specific period (eg, [n + T 1 , n + T 2 ]). It can be assumed that it corresponds to the candidate subframe (resource) of.
  • the selection of the information (eg, T 1 and T 2) for determining the specific section may depend on the terminal implementation.
  • T 1 may have a value of 4 or less
  • T 2 may have a value of 20 or more and 100 or less.
  • the terminal selection of T 2 should satisfy the latency requirement.
  • 'SENSING DURATION (D)' and / or 'TX RESOURCE (RE) SELECTION DURATION (R)' are (implicitly) identical to 'V2X MESSAGE GENERATION PERIOD' (and / or '(SERVICE) LATENCY REQUIREMENT').
  • Assumptions (and / or 'V2X MESSAGE GENERATION PERIOD' (and / or '(SERVICE) LATENCY REQUIREMENT' and / or '(V2X MESSAGE (/ TB)) PPPP' e.g.
  • V2X MESSAGE GENERATION TIME the boundary of the time domain in which a sensing operation (related to resource (re) reservation (/ selection)) of a specific V2X UE is performed.
  • the above-described boundary criteria of a time domain in which a sensing operation is performed (regarding resource (re) reservation (/ selection)) (eg, For example, the point of time (V2X MESSAGE TX TIME, V2X MESSAGE GENERATION TIME) plus (or minus) a predetermined offset (/ signaled) in advance is based on the boundary of the time domain where the final 'sensing operation is performed. 'Can also be.
  • the V2X UE is a resource interval from “SF # (KDS) to SF # (KS) (or SF # (K-1-DS) to SF # (K-1-S)) (here, for example , “D” and “ S ” respectively represent 'SENSING DURATION' (previous / signaled), '(TX) PROCESSING TIME' (of V2X UE) ”, and you are (real) V2X MESSAGE TX After the sensing operation is performed at the remaining (resource) time points other than the (resource) time point at which the operation is performed, (“SF # (K + 1) to SF # (K + 1 + R) (or SF # K to SF Resource intervals up to # (K + R)), where, for example, “R” stands for 'TX RESOURCE (RE) SELECTION DURATION', which is previously defined (/ signaled) ”in future V2X MESSAGE (Re) reserving
  • the terminal may perform V2X communication based on the selected resource (S1020).
  • the selected resource may mean a resource determined on the basis of (SELECTION WINDOW) configured to satisfy a LATENCY REQUIREMENT (ie, a resource on a selection window that satisfies a latency request).
  • the terminal may select a subframe within a selection window based on a sensing result performed during the terminal-specific sensing interval, and the terminal may select a transmission reservation resource based on the selected subframe. And V2X communication on the reserved resource.
  • Specific examples of performing V2X communication based on the resource selected by the terminal are as described above (or described later), and thus, detailed descriptions thereof will be omitted.
  • V2X MESSAGE is periodically generated (for example, '100MS') (for each V2X UE (S)).
  • 'SENSING DURATION (/ TX RESOURCE (RE) SELECTION DURATION)' and 'REPETITION NUMBER related to V2X MESSAGE TX' are set to '100MS' and '1', respectively.
  • FIG. 11 shows the remaining (resource) time points except for (resource) time point at which the user performs a (actual) V2X MESSAGE TX operation on “resource section from SF # (K-100) to SF # K”.
  • 12 shows the (resource) time points except for (resource) time point at which the user performs a (actual) V2X MESSAGE TX operation on the “resource section from SF # (K-1) to SF # (K-101)”
  • FIG. Reschedules its own V2X MESSAGE TX related resource (s) on “Resource section from SF # (K + 1) to SF # (K + 101)” based on the sensing result Shows the case of (/ selection). For example, in FIG. 11 and FIG. 12, 'transmission of the (N + 1) th V2X MESSAGE' is performed through a reselection resource (eg, SF # (K + Z + 100)).
  • a reselection resource eg,
  • 13 and 14 illustrate re-scheduled (/ selected) resource determination and (V2X MESSAGE) transmission immediately based on the rescheduled (/ selected) resource.
  • FIG. 13 and FIG. 14 show that the V2X UE omits (V2X MESSAGE) transmission on 'SF # K' (according to a predefined rule) under the same situation as FIGS. 11 and 12, respectively. And then detect (/ measure) the resource (SF # K) that was used (or previously reserved (/ selected)) and determine the optimal rescheduled (/ selected) resource and rescheduled (/ selected) Shows the case of performing (V2X MESSAGE) transmission immediately based on the resource.
  • 'transmission of the (N + 1) th V2X MESSAGE' is performed through the reselection resource (for example, SF # (K + Z + 100)).
  • V2X MESSAGE transmission (/ suspended) for sensing (/ measurement) of the used (or previously reserved (/ selected)) resource (in [Proposed rule # 1] above)
  • 'N-th V2X MESSAGE transmission' may be retransmitted according to the following (some) rule.
  • the '(SERVICE) LATENCY REQUIREMENT' cannot be satisfied when retransmission of the 'omitted (/ suspended) V2X MESSAGE' via the rescheduled (/ selected) resource is performed, It may be defined such that retransmission of 'omitted (/ suspended) V2X MESSAGE' is not performed based on (/ selected) resources.
  • retransmission of the omitted (/ suspended) V2X MESSAGE (SF # K) is performed through the rescheduled (/ selected) resource (SF # (K + Z)).
  • '(SERVICE) LATENCY REQUIREMENT (100MS)' can be satisfied when the V2X MESSAGE is immediately (via rescheduled (/ selected) resource (SF # (K + Z))). Retransmission of is performed.
  • a V2X UE causes a resource rescheduling to take into account only 'candidate resources' whose retransmission of 'omitted (/ interrupted) V2X MESSAGE' can satisfy '(SERVICE) LATENCY REQUIREMENT'. / Optional).
  • the V2X UE finally rescheduls (/ selects) an optimal resource that meets a predefined (rebooking (/ selection)) criterion (/ rule) among its 'candidate resources'.
  • the rule may, for example, guarantee a high probability of retransmission of 'omitted (/ interrupted) V2X MESSAGE'.
  • the area of 'TX RESOURCE (RE) SELECT DURATION (R)' may be reduced.
  • Example # 2-3 (Previous) Resource (/ POOL) for retransmission (only) of 'Omitted (/ interrupted) V2X MESSAGE' is set (/ signaled) independently (/ signaled), or V2X
  • the UE may further select resources for retransmission of the 'omitted (/ interrupted) V2X MESSAGE' according to the below (some) rule (/ reference) previously defined (/ signaled).
  • the additionally selected corresponding resource in the latter case
  • Example # 2-3-1 Selecting additional (retransmission) resources, considering only the 'candidate resources' that retransmission of 'omitted (stopped) V2X MESSAGE' can satisfy '(SERVICE) LATENCY REQUIREMENT' Do it.
  • resource rescheduling (/ selection) for transmission of future (occurring) V2X MESSAGE (S), rather than retransmission of 'omitted (/ interrupted) V2X MESSAGE' is predefined (/ signaling). It can be performed in the 'TX RESOURCE (RE) SELECTION DURATION'.
  • a resource that has been rescheduled (/ selected) for this purpose (even though it may satisfy '(SERVICE) LATENCY REQUIREMENT' when a retransmission of the 'omitted / stopped V2X MESSAGE' is performed) It can be excluded from candidate resources for retransmission of 'omitted (/ interrupted) V2X MESSAGE'. That is, for example, it is interpreted that a resource for transmission of a future (generated) V2X MESSAGE (S) has a (relatively) higher priority than a resource for retransmission of a 'omitted (/ suspended) V2X MESSAGE'. (Or, the transmission of future V2X MESSAGE (S) is interpreted as being performed through the (most) optimal resource that satisfies the predefined (rebooking (/ selection)) criteria (/ rules).) Can be.
  • first (or last) ' Repetitive transmission timing '(or' SF ') may be defined as a boundary of a time domain in which a sensing operation (related to resource (re) reservation (/ selection)) is performed.
  • the V2X UE may indicate “SF #.
  • the V2X UE may indicate “SF”. Resource interval from # (N + K2-D) to SF # (N + K2) (or SF # (N + K2-1-D) to SF # (N + K2-1)) ”, After performing the sensing operation at the remaining (resource) time points except for the (resource) time point at which the V2X MESSAGE TX operation is performed, the user may (re) reserve (/ select) the V2X MESSAGE TX related resource (s) in the future. do.
  • the first (or lastly, the omitted transmission timing (or 'SF') may be defined as a boundary of a time domain in which a sensing operation (regarding resource (re) reservation (/ selection)) is performed.
  • each transmission or a different 'RV (REDUNDANCY VERSION)' transfer) (or initial (INITIAL) transmission and retransmission (RETRANSMISSION)
  • the (some) parameters below may be defined (/ operated) differently (or independently).
  • different MESSAGE 'sizes (/ types)' and / or 'transmission (/ occurrences)' and / or 'PRIORITY's or pre-defined (/ signaling)' SECURITY information '
  • the following (some) parameters may be defined (or operated differently) independently (or differently) depending on whether or not is included and transmitted.
  • a low (or high) priority MESSAGE-related 'SENSING DURATION value' is set long to reduce resource rebooking (/ selection) frequency, and a high (or low) priority MESSAGE-related 'SENSING DURATION'
  • a short value can be set to make the resource rescheduling (/ selection) frequency high.
  • Example # 3-3-1 'SENSING DURATION value' (and / or 'probability value related to resource rescheduling (/ selection)' and / or 'backoff value related to resource rescheduling (/ selection)' and // Or 'MAXIMUM RESERVATION TIME' and / or 'MUTING (/ SILENCING / transmission skipping) probability (/ cycle / pattern / whether)')
  • the following (some) rules, 'resource (re-) reserving (/ selection) related) sensing operation' and / or 'resource rescheduling (/ selection)' can be defined to be performed.
  • the corresponding (hopping) pattern may be '(SOURCE) UE ID' (and / or 'POOL (/ resource) cycle index (where V2X MESSAGE TX operation is performed)' and / or 'SA PERIOD index'). It may be randomized based on the input parameter (s) of.
  • the probability of '(RANDOM) MUTING (/ SILENCING / sending) / Pattern) ' may be defined differently (or independently).
  • such a rule is that the (RANDOM) MUTING (/ SILENCING / sending skipping) probability (/ cycle / pattern) 'between' RV 0 '(initial transmission) and another' RV '(retransmission).
  • the (RANDOM) MUTING (/ SILENCING / sending skipping) probability (/ cycle / pattern) 'between' RV 0 '(initial transmission) and another' RV '(retransmission).
  • 'RV 0' (initial transmission) may be set to be “(RANDOM) MUTING (/ SILENCING / transmitting / stopping)” with a smaller probability than other 'RV' (retransmission).
  • the (hopping) pattern may include '(SOURCE) UE ID' (and / or 'POOL (/ resource) cycle index (where V2X MESSAGE TX operation is performed)' and / or 'SA PERIOD index'). It may be randomized based on the input parameter (s) of.
  • (all) resource rescheduling (/ selection) can mitigate the drastic change in the interference environment.
  • a channel in which (semi-static) (re) reservation (/ selection) of V2X MESSAGE TX related resource (s) is performed and a "sensing operation" is predefined (/ signaled).
  • the decoding operation of 'DATA (or PSSCH (PHYSICAL SIDELINK SHARED CHANNEL))' may be performed according to the following (some) rules.
  • the 'boundary of time domain in which a sensing operation is performed' (relative to resource (re) reservation (/ selection)) of a specific V2X UE is selected based on a predefined (/ signal) rule. (Or REFERENCE SF) ”( SF #P ).
  • D means 'SENSING DURATION' defined in advance (/ signal)
  • 'CEILING (X)' and 'FLOOR (X)' are 'functions that derive the minimum integer greater than or equal to X', respectively.
  • 'A function that derives the largest integer less than or equal to X'.
  • the "PIVOT SF (or REFERENCE SF)" is ('(SOURCE) UE ID' (and / or 'POOL (/ resource) period index (where the V2X MESSAGE TX operation is performed)' and / or ' Based on an input parameter (s) such as SA PERIOD index ').
  • the proposed rule may be based on the (previous) interval of the length (or pre-defined (/ signaled) length) when an initial (INITIAL) sensing operation is performed after (V2X UE) power on and / or at a previous point in time. (In Windows) only if V2X MESSAGE transmission is not performed (never).
  • the V2X UE (S) is linked to 'DATA (/ PSSCH) on' SF # (N + D) '(eg,' D ⁇ C ') in' SF # (N + C) '.
  • 'DATA / PSSCH
  • V2X UE # X when performing other 'TB' related 'POTENTIAL DATA (/ PSSCH)' transmission on 'SF # (N + E)') Name '(frequency)' indicated as '/ signaled' as ' UN-BOOKING RESOURCE '.
  • V2X UE # Y performs a sensing operation based on 'ENERGY MEASUREMENT (and / or SA DECODING)', (currently (for example, 'SF # (N + D)') or a sensing interval
  • '(frequency) resources' indicated as 'UN-BOOKING RESOURCE' by V2X UE # X where high energy is measured (when own resource selection (/ reservation)) according to (some) rules below ( Can be processed.
  • the corresponding '(frequency) resource' indicated by the V2X UE # X as 'UN-BOOKING RESOURCE' will be (for some time) in the future (including 'SF # (N + E)').
  • V2X UE # Y Although it is unlikely to be used, it is selected (/ reserved) by V2X UE # Y due to the high energy currently measured (eg within 'SF # (N + D)' or within the sensing interval). Because it will not be.
  • the following rules are named as 'UN-BOOKING RESOURCE' resources that the V2X UE (S) has reserved (/ selected) in a previous (resource (re) selecting (/ reserving) cycle) from a certain point in time. ) Channel (e.g. 'SA (/ PSCCH)' (or 'DATA (/ PSSCH)') that has been defined (/ signaled) in advance (to another V2X UE (S)) It can also be extended when notified.
  • the following rules are applied only when the V2X UE (S) performs a sensing operation based on 'ENERGY MEASUREMENT ONLY' or a sensing operation based on 'COMBINATION OF ENERGY MEASUREMENT AND SA DECODING'. For example, it may not be applied when performing a sensing operation based on 'SA DECODING ONLY'.
  • the energy measurement for '(frequency) resource' indicated by 'UN-BOOKING RESOURCE' is obtained by subtracting 'RSRP measurement' (from the energy value measured on that '(frequency) resource'). It is regarded as a value (or a value other than a preset offset value (/ signaled)), and 'RANKING' is performed for energy measured values for each resource.
  • the 'RSRP measurement' is a reference signal (eg, 'DM-' on a pre-set (/ signaled) channel (eg, 'PSBCH' (/ 'PSCCH' / 'PSSCH')). RS ').
  • 'SA (/ PSCCH)' and 'DATA (/ PSSCH)' are 'FDM', '(frequency) resource' (or 'SA (/ PSCCH)' or 'DATA (/ PSSCH)' )
  • the final final 'RSRP (measurement) value' is (differently depending on the separation distance (in frequency domain) between 'SA (/ PSCCH)' and 'DATA (/ PSSCH)'.
  • the final derived (/ assumed) may be compensated for (or added to) the applied (preset (/ signaled)) 'MPR value').
  • 'Energy Measure Value' or 'RANKING Value' for '(Frequency) Resource' indicated by 'UN-BOOKING RESOURCE' shall be regarded as a pre-set (/ signaled) value. Can be.
  • the 'RANKING value' for the '(frequency) resource' indicated by 'UN-BOOKING RESOURCE' is the lowest probability (eg, the '(frequency) resource') is selected (/ reserved). (Or the highest probability (eg, the probability that the corresponding '(frequency) resource' is selected (/ reserved)) may be set (/ signaled).
  • a rule may be defined such that a '(frequency) resource' indicated as 'UN-BOOKING RESOURCE' is always excluded (or (preferred) selected) at the time of resource selection (/ reservation).
  • the sensing operation of the V2X UE (S) may be performed as follows.
  • the following schemes suggest a (efficient) 'sensing method' for the V2X UE (S) to select 'resource resources related to V2X MESSAGE transmission ( TX )'.
  • V2X MESSAGE transmission TX
  • the wording of 'sensing' may be interpreted as (A) an energy (or power) measurement operation and / or (B) a predefined (/ signaled) channel (e.g., PSCCH (PHYSICAL SIDELINK CONTROL CHANNEL).
  • the 'energy (or power) measurement' is (A) ' RSI (RECEIVED SIGNAL STRENGTH INDICATOR) form (e.g. (the' DM-RS 'of the predefined (/ signaled) antenna port is transmitted) Average value of received powers measured in symbols) or (B) ' RSRP (REFERENCE SIGNAL RECEIVED POWER) (e.g. (of a predefined (/ signaled) antenna port)).
  • A ' RSI (RECEIVED SIGNAL STRENGTH INDICATOR) form (e.g. (the' DM-RS 'of the predefined (/ signaled) antenna port is transmitted) Average value of received powers measured in symbols) or (B) ' RSRP (REFERENCE SIGNAL RECEIVED POWER) (e.g. (of a predefined (/ signaled) antenna port)).
  • 15 and 16 illustrate 'control (/ scheduling) information' and 'data (associated with the corresponding control (/ scheduling) information)' (in terms of 'SINGLE V2X UE') transmitted in the form of 'FDM' on the same SF. An example of the case is shown.
  • FIG. 15 and FIG. 16 respectively indicate 'when data linked with control (/ scheduling) information is transmitted on a continuous resource RB (RESOURCE BLOCK))', 'When data linked with control (/ scheduling) information is transmitted.
  • RB continuous resource
  • FIG. 15 and FIG. 16 respectively indicate 'when data linked with control (/ scheduling) information is transmitted on a continuous resource RB (RESOURCE BLOCK))', 'When data linked with control (/ scheduling) information is transmitted.
  • 'LINK BUDGET' of 'control (/ scheduling) information' in terms of 'SINGLE V2X UE'
  • 'control (/ scheduling) information' and '(corresponding control (/ scheduling) information It may be considered that the 'interlocked data' is transmitted in the form of ' TDM (TIME DIVISION MULTIPLEXING)' on another SF.
  • FIG. 17 shows an example of a case where the 'control (/ scheduling) information transmission pool' and the 'data transmission pool' are set (/ configured) in the 'FDM' form (from a system perspective).
  • 'Control (scheduling) information transfer pool' and 'data transfer pool' can be set (/ configured) in the form of 'FDM'. 17 shows an example of such a case.
  • the 'data transmission pool' associated with a specific 'control (/ scheduling) information transmission pool' is 'TDM'.
  • the terminal performs sensing in each (sub) channel unit, but the actual V2X message transmission may be performed in a plurality of subchannel units. If the UE has a plurality of subchannels actually used for V2X message transmission (that is, V2X message transmission is performed in units of a plurality of subchannels), it is a question of how to perform sensing. In the following description, a method of performing sensing when a plurality of subchannels are used for V2X message transmission will be described.
  • a rule may be defined to cause the V2X UE S to perform a sensing operation in 'resource size units' to be used for (they) 'V2X MESSAGE TX'.
  • the 'sensing resource unit size' of the V2X UE becomes equal to the 'resource size' (used by the corresponding V2X UE) for the 'V2X MESSAGE TX'.
  • the terminal performs the energy measurement by the sensing operation, it may be a question of which resource unit / size to perform the energy measurement.
  • the unit / size of energy measurement can be a resource unit / size that the terminal uses for data transmission, for example, a subchannel size.
  • a resource unit / size that the terminal uses for data transmission for example, a subchannel size.
  • energy measurement for the sensing operation may be performed in a resource unit of the specific subchannel size.
  • FIG. 18 is a flowchart illustrating a method of performing sensing when a number of subchannels used for V2X message transmission is plural, according to an embodiment of the present invention.
  • the UE selects a resource for V2X message transmission by sensing in units of subchannels having a size corresponding to the size of a subchannel used for V2X message transmission (S1810).
  • the terminal may select the resource by configuring a selection window within a range that satisfies a latency request, and the V2X message transmission is performed in units of a plurality of subchannels, and sizes of the plurality of subchannels.
  • a resource for performing the V2X communication may be selected based on sensing performed in units of subchannels having a size corresponding to.
  • the sensing area used when the sensing is performed may be an area having a size corresponding to the sizes of the plurality of subchannels.
  • the terminal may perform sensing by using an energy measurement average value of the subchannels included in the plurality of subchannels.
  • the terminal may not only perform sensing in units of a plurality of subchannels, but also configure a selection window within a range that satisfies the latency request.
  • the resource may be selected.
  • an example of selecting the resource by configuring a selection window within a range that satisfies the latency request is as described above.
  • V2X message transmission is performed in units of a plurality of subchannels
  • the terminal performs sensing in units of a plurality of subchannels
  • the terminal may perform sensing in units of subchannels having a size corresponding to the size of a subchannel used for V2X message transmission, and the terminal may select a resource for V2X message transmission based on the sensing result.
  • the sensing eg, ENERGY MEASUREMET
  • the sensing may be performed with a subchannel size of data to be transmitted by the terminal.
  • a linear average value of the subchannels may be used. More specifically, for the candidate single subframe resource R x, y remaining in set S A (which is a collection of all candidate single subframe resources), the sensing region (eg, the metric E x, y ) is subchannels x + k It can be defined as the linear average of the S-RSSI measured at.
  • K 0, ..., L subCH -1 can be defined as, L subCH may mean the number of sub-channels required when the actual packet is sent.
  • FIG. 19 illustrates an example of ENERGY MEASUREMET (ie, sensing) performed with a subchannel size of data to be transmitted by a UE.
  • the subchannel size of the V2X message eg, V2X data
  • L subCH 2
  • ENERGY MEASUREMET may be performed in units of two subchannels corresponding to the subchannel size of data transmitted by the terminal.
  • the terminal may first determine a sensing value for the sensing region # 1 by using an average of energy sensing values in the sensing region # 1, that is, the subchannel # 1 and the subchannel # 2.
  • the terminal may determine the sensing value for the sensing region # 2 by using the average of the energy sensing values in the sensing region # 2, that is, the subchannel # 2 and the subchannel # 3.
  • the terminal may determine the sensing value for the sensing region # 3 by using the average of the energy sensing values in the sensing region # 3, that is, the subchannel # 3 and the subchannel # 4.
  • the subchannel size of data to be transmitted by the terminal may have three or more values.
  • the UE determines a sensing value for the sensing area by using an average of energy sensing values in the subchannels # 1 to # 3. It may be.
  • the terminal may transmit a V2X message based on the selected resource (S1820).
  • the terminal may select a subframe within a selection window based on the sensing result performed during the terminal specific sensing interval, and the terminal determines transmission reservation resources based on the selected subframe. And V2X communication on the reserved resource.
  • Specific examples of performing V2X communication based on the resource selected by the terminal are as described above (or described later), and thus, detailed descriptions thereof will be omitted.
  • 20 and 21 illustrate an example of a form of 'PARTIALLY OVERLAPPED REGION BASED SENSING' (or 'SLIDING WINDOW BASED SENSING').
  • the sensing operation is in the form of (A) 'NON-OVERLAPPED REGION BASED SENSING' (see FIG. 20) and / or (B) 'PARTIALLY OVERLAPPED REGION BASED SENSING' (or 'SLIDING WINDOW BASED SENSING') (see FIG. 21). ) Can be implemented.
  • the regions where the sensing operation is performed do not overlap each other (for example, '(sensing region # 1)', ' (Sensing area # 2) 'and' (sensing area # 3) 'do not overlap each other).
  • 'Area' (3) and 'sensing area # 4', '(sensing area # 4) and (sensing area # 5)' are defined in advance (/ signaling), respectively (or 'amount of resources (/ size)').
  • the electronic rule '(A)' may lower the 'complexity of performing the sensing operation' of the V2X UE, as compared to the latter rule ('(B)').
  • the total number of sensing required for the same sized resource pool may be less than the former rule '(A)' compared to the latter rule ('(B)').
  • the latter rule ('(B)') is more than the former rule ('(A)') (although there may be more 'total number of sensings' required in the same sized resource pool).
  • MESSAGE TX 'related' available resource candidate locations' can be relatively (or closely) searched (/ selected).
  • V2X UE (S) after causing the V2X UE (S) to perform a sensing operation (priority) with a preset (/ signaled) 'resource unit (/ size)' (eg, '1RB') , '(Weighted) mean' (or 'SUM') (or multiple sensing (/ measures) of multiple sensing (/ measurement) values corresponding to 'resource size (/ unit)' to be used for 'V2X MESSAGE TX'
  • the maximum value (or minimum value or median value) may be regarded as a representative sensing value for each resource size (/ unit) (to be used for V2X MESSAGE TX).
  • a V2X UE uses a plurality of resources of discontinuous location on a frequency (resource) region to transmit (V2X) channel / signal (e.g., MULTI-
  • V2X channel / signal
  • the previously set (/ signaled) 'sensing resource unit unit (/ size)' for example, 'K''RB' (or ' RBG (RESOURCE BLOCK GROUP) ') (' NON-OVERLAPPED REGION BASED SENSING 'or' PARTIALLY OVERLAPPED REGION BASED SENSING '(/' SLIDING WINDOW BASED SENSING ')
  • It is possible to select (finally) its own 'V2X MESSAGE TX' related resources (among the resources of the (energy) measurement that are smaller (or larger) than the preset (/ signaled) threshold).
  • V2X UE transmits' (SINGLE) V2X TB (/ MESSAGE) '
  • repeated transmission of' K times' for example, 'K' values are 'initial transmission' and '
  • 'K' the number of "retransmissions" is included (all).
  • the value 'K' is '4'.
  • 'SA (/ PSCCH)' transmission is performed in 'SF # (N + C)', and coordinated ('4' times) 'DATA (/ PSSCH)' transmissions are respectively 'SF # (N' + D) ',' SF # (N + D + K1) ',' SF # (N + D + K2) ',' SF # (N + D + K3) '(for example,' C ⁇ D ',' 0 ⁇ K1 ⁇ K2 ⁇ K3 ').
  • a field may be defined to indicate 'resource locations', and the following (some) rules may be applied.
  • the corresponding field is' time resource location 'related to' the remaining ('(K-1)') except 'initial (/ first) transmission' And / or 'initial (/ first) transmission' is performed (always) on the same time resource (location) as 'SA (/ PSCCH)' ('SF # (N + C)').
  • / or the 'time resource location' associated with the 'initial (/ first) transmission' is defined as the 'SA (/ PSCCH)' ('SF # (N + C)') transmission time and the 'initial' It can be interpreted that the signal is signaled to the (other) field indicating the interval between the (first) transmission's time points.
  • 'Time Resource Location' related to 'Initial (/ First) Transmission' means the 'SA (/ PSCCH)'('SF# (N + C)') transmission time and the 'Initial ( 'First) Transmit' signaled to (another) ' FIELD # F ' indicating the interval between ('SF # (N + D)') and 'transmissions (of' (K-1) ')' Related 'time resource locations' (e.g.
  • 'SF # S' The maximum interval ( MAX_GAP) between the 'first transmission'('SF# (N + D)') and the 'Kth transmission'('SF# (N + D + K3)') It can be signaled with (new) ' FIELD # S ' of the same size (/ size).
  • 'FIELD # S' may be implemented in the form of 'bitmap'.
  • the 'bitmap' related to 'FIELD # S' refers to the initial (/ first) (DATA (/ PSSCH)) transmission '(' SF # (N + D) ') as a reference point (/ starting point). Can be applied.
  • the 'MAX_GAP' value is set (/ signaling) to '10'
  • 'FIELD # S' is signaled (set / set) to '0100100100', 'second transmission', 'third transmission'
  • the 'fourth transfer' is performed on 'SF # (N + D + 2)', 'SF # (N + D + 5)' and 'SF # (N + D + 8)', respectively.
  • repeated transmissions of 'K times' is the pre-set (/ signaled) 'SA (/ PSCCH)'('SF# (N + C)') transmission point and it may also be signaled to 'K-th transmission' ( 'SF # (N + D + K3)') 'FIELD # Q' ( new) of the maximum distance the same size as (MAX_ TVAL) (/ size) between the point in time.
  • 'FIELD # Q' may be implemented in the form of 'bitmap'.
  • the 'bitmap' related to 'FIELD # Q' may be applied as a reference (/ starting point) based on a time point of 'SA (/ PSCCH)'('SF# (N + C)').
  • V2X communication-related 'CONGESTION (/ LOAD / MEASUREMENT) CONTROL results' can be a' pattern (shape / form) that 'FIELD # S' (or 'FIELD # Q' (or 'FIELD # F')) can have.
  • the (limitation) information is determined by the V2X UE (S) by reporting the 'CONGESTION (/ LOAD / MEASUREMENT)' situation (according to a predefined rule (/ signaling)) or ( Based on the 'CONGESTION (/ LOAD / MEASUREMENT)' information reported or measured by the V2X UE (S), the (serving) base station may set (/ signal) the UE.
  • 'MAX_GAP' (or 'MAX_TVAL') may have as 'CONGESTION (/ LOAD / MEASUREMENT) CONTROL result' related to V2X communication. It can happen (as well).
  • Example #B Repetitive transmissions of 'K' (eg 'SF # (N + D)', 'SF # (N + D + K1)', 'SF # (N + D + K2) ',' SF # (N + D + K3) ') related' time resource locations' is defined as' K 'defined on' SA (/ PSCCH) '(' SF # (N + C) ') FIELD # F '(' (example # A) ') (e.g.,' (X th) FIELD # F 'means' SA (/ PSCCH)'('SF# (N + C)') and Signaled to an interval (on the time domain) between the X th transmission 'time points.
  • 'K' eg 'SF # (N + D)', 'SF # (N + D + K1)', 'SF # (N + D + K2) ',' SF # (N + D + K3) ') related'
  • Example #C (under circumstances where the (some) rules above (eg, (example #A), (example #B)) apply) ('K times'(eg,' SF # (N + D) ',' SF # (N + D + K1) ',' SF # (N + D + K2) ',' SF # (N + D + K3) '))' DATA (/ PSSCH) '
  • SA SA
  • PSCCH PSCCH
  • the following (some) rules may apply.
  • the following (some) rules may be limitedly applied only when '(DATA / (PSSCH)) FREQUENCY HOPPING' is performed.
  • Example # 1 'SF PATTERN' information on 'SA (/ PSCCH)' ('SF # (N + C)') related to 'initial (/ first) transmission' ('SF # (N + D)') / Field) and / or 'frequency resource (location)' information (/ field) and / or some of the 'MCS' information (/ field) are related to 'transmission of the rest (of' (K-1) ') The same may be transmitted on (/ PSCCH) '.
  • 'frequency resource (location)' related information ('remaining (of' (K-1) ')' is directly applied on the relevant 'SA (/ PSCCH)' (directly).
  • Is not transmitted (/ signaled) and / or 'FIELD # F' values are equal to the interval between the 'SA (/ PSCCH)' transmission time and the 'initial (/ first) transmission' time point associated with the 'initial (/ first) transmission'.
  • V2X UE (S) successfully receives (/ decodes) 'SA (/ PSCCH)' for 'send after' even if it fails to receive (/ decode) 'SA (/ PSCCH)' for 'previous transmission'.
  • the number of times "DATA (/ PSCCH) transmission" is Information (or 'RV' information related to 'DATA (/ PSCCH) transmission') can be combined to identify (or deduce) the data.
  • 'time resource (location) information' related to 'post transmission' may be identified (/ derived) through 'FIELD # F' on 'SA (/ PSCCH)' related to 'post transmission'.
  • 'SA (/ PSCCH)' reception related to 'initial (/ first) transmission' (/ The V2X UE (S) that has successfully decoded may not attempt (partly) to decode (/ receive) the 'SA (/ PSCCH)' related to the 'transmission (of' (K-1) ')'.
  • 'TIMING GAP' between a transmission time of 'FIELD # F' (for example, 'SA (/ PSCCH)') and a transmission time of 'associated data (PSSCH)' (in the proposal rule).
  • a transmission time of 'FIELD # F' for example, 'SA (/ PSCCH)'
  • a transmission time of 'associated data (PSSCH)' in the proposal rule.
  • PSSCH 'associated data
  • a field indicating an intention may be set (/ signaled) independently (or (all) equally) for each 'SA (/ PSCCH)' transmission.
  • the V2X UE S may attempt to decode (/ receive) all of the 'SA (/ PSCCH)' related to transmission 'K'.
  • the V2X TX UE in case of transmitting one 'TB' in several SF (S)), (in the middle) a preset (/ signaled) rule (e.g.
  • Example # 2 when sending 'SA (/ PSCCH)' related to 'X th transmission' (eg 'X> 1'), 'FIELD # S' (or 'FIELD #' Q ') may assume that the' Xth transmission 'is' initial (/ first) transmission' and set 'FIELD # S' (or 'FIELD # Q').
  • 'frequency resource (location)' information (/ field) is defined on 'SA (/ PSCCH)' and '(DATA / (PSSCH)) FREQUENCY HOPPING' operation is performed
  • 'frequency resource ( Location) 'information (/ field) value itself may be set differently (in consideration of the' (DATA / (PSSCH)) FREQUENCY HOPPING pattern ') for each' SA (/ PSCCH) 'transmission.
  • 'SA (/ PSCCH)' related to '(N + 1) th transmission' means '(DATA resource (location))' scheduled by 'SA (/ PSCCH)' related to 'Nth transmission'. This is because it is necessary to designate (/ signal) the changed 'frequency resource (location)' after applying / (PSSCH)) FREQUENCY HOPPING '.
  • the V2X UE (S) each time a condition that is set in advance (/ signaled) the (transmission) resources reserved (/ selected) resources (for a certain period (/ period)) is satisfied Can be reselected.
  • the counter is '0' (or '0' When a small value '), it can be made to reselect the (transfer) resources reserved (/ selected) it (for a period (/ period)).
  • the counter may be (A) a (new) TB transfer (e.g., the wording of the 'TB transfer' is interpreted as 'the actual (successfully) performed TB transfer' only and / or ('sensing result' And / or pre-defined (/ signaling) per 'conflict with omitted TB transmissions' due to 'conflicts with relatively high-priority message transmissions (of other V2X UE (s)'). ) Or (B) a predefined (period) value (e.g. '100MS'), which is reduced (or increased) to a value (e.g.
  • '1' It may be allowed to decrease (or increase) to a signaled value (eg, '1').
  • the operation of (re) selecting a counter value (or 'RESET' the counter value) in a predefined (/ signaling) range is related to '(ALL) SEMI-PERSISTENTLY SELECTED RESOURCE (S)'. It may be defined as '(RESOURCE (S)) RESELECTION' triggered.
  • the 'C_RANGE' value may be set (/ assumed) differently (partly) according to the following (partial) parameter.
  • the 'C_RANGE' value (according to the range of (specific) parameters) may be predefined or signaled from the network.
  • Example # 1 'V2X UE VELOCITY'.
  • a (relatively) long (or short) 'C_RANGE' value may be applied.
  • Example # 2 '(TRANSMISSION) SYNCHRONIZATION REFERENCE TYPE' (e.g. 'eNB', 'GNSS', 'UE').
  • '(TRANSMISSION) SYNCHRONIZATION REFERENCE TYPE' is GNSS (or eNB or UE)
  • eNB or UE or GNSS
  • eNB or UE or GNSS
  • Long (or short) 'C_RANGE' values may apply.
  • Example # 3 'V2X MESSAGE TRANSMISSION (and / or GENERATION) PERIODICITY'.
  • PERIODICITY' which is long (relatively or above a pre-set (/ signaled) threshold)
  • the (relatively) long (or short) 'C_RANGE' value This may apply.
  • Example # 4 'V2X MESSAGE (and / or SERVICE) TYPE' (e.g. 'EVENT-TRIGGERED MESSAGE', 'PERIODIC MESSAGE' (or '(relatively) small LATENCY REQUIREMENT (and / or (relatively)) High Reliability (/ QOS) REQUIREMENT and / or (relatively high priority) messages ',' (relatively) long LATENCY REQUIREMENT (and / or (relatively) low reliability (/ QOS) REQUIREMENT and / or (relative) Low priority) '), where, for example, for' EVENT-TRIGGERED MESSAGE ', a (relatively) long (or short)' C_RANGE 'value is applied (relative to' PERIODIC MESSAGE '). May be.
  • TYPE' e.g. 'EVENT-TRIGGERED MESSAGE', 'PERIODIC
  • Example # 5 'V2X MESSAGE (and / or SERVICE) PRIORITY (and / or LATENCY REQUIREMENT and / or RELIABILITY REQUIREMENT and / or QOS REQUIREMENT).
  • 'V2X MESSAGE (and / or SERVICE) PRIORITY and / or LATENCY REQUIREMENT and / or RELIABILITY REQUIREMENT and / or QOS REQUIREMENT
  • long (or short) 'C_RANGE' value may apply.
  • the V2X TX UE (S) may be configured to perform (V2X MESSAGE) transmission resource (re) reservation (/ selection) operation according to the following (some or all) rules.
  • the (re) transmission resource (re) reservation (/ selection) operation may be performed randomly within a range (eg, "5 to 15") previously set (/ signaled) by the V2X TX UE (S). It can be triggered (at least) when the selected (transmit resource (re) reserved) counter value ( SEL _ CNTVAL ) reaches "0" (and / or "negative integer value").
  • the (selected) counter value is the (real) TRANSPORT BLOCK ( TB ) (/ packet) transmission (and / or (regardless of the ((real)) TB (/ packet) transmission) (selected) counter value (/ Number of transmission resources (of resource reservation (interval) period “P”) (and / or number) derived from (and / or (selected) counter value (/ number) are considered reserved (/ selected).
  • P resource reservation
  • the term “(re) reservation (/ selection)” refers to (A) the probability value ( KEEP_P ) (eg, “V2X TX UE (S) pre-set (/ signaling)” If you decide not to retain (/ reuse) the previously selected (transfer) resource based on the aforementioned STEP 3 ”) (for example, a randomly chosen value between“ 0 ”and“ 1 ”may be less than or equal to KEEP_P).
  • Maintaining (/ reusing) resources (and / or (C) the same finite number of existing (or preconfigured (/ signaled) dogs) (E.g., interpret the SEL_CNTVAL value (and / or interpret it as a value derived from the SEL_CNTVAL value) greater than (or greater than or equal to))) (or a resource such as (old)) to reserve (again) Can be interpreted as (generally).
  • Example # 1 As an example, when the V2X TX UE (S) performs transmission resource (re) reservation (/ selection), an infinite number of subframes (of resource reservation (interval) period "P") (/ resource) After (priority) is reserved (/ selected), it is possible to use the reserved (/ selected) resource until the transmission resource (re) reserved (/ selected) operation is triggered.
  • a problem of “ SFN (SYSTEM FRAME NUMBER) WRAP AROUND” may occur.
  • FIG. 22 schematically illustrates an example in which the problem of “SFN (SYSTEM FRAME NUMBER) WRAP AROUND” occurs.
  • V2X TX UE # X that intends to perform transmission resource (re) reservation (/ selection) at a resource reservation (interval) period of “100MS” at the time of SUBFRAME # 0.
  • V2X TX UE # X is SUBFRAME # 0, SUBFRAME # 100,... If SUBFRAME # 10200 and SUBFRAME # 10300 should be selected, SUBFRAME # 60 will be selected (due to the limitation of SFN).
  • a second transmission opportunity occurs before SUBFRAME # 100.
  • 23 is a flowchart of a method for reserving a finite number of resources according to an embodiment of the present invention.
  • the terminal may make a reservation for a finite number of resources on which V2X communication is performed (S2310).
  • the terminal may select a resource on the selection window and perform a reservation for resources that are repeated based on a specific period from the selected resource, wherein the reserved resource (s) may be a finite number.
  • the finite number may be proportional to a value of a counter (eg, SL_RESOURCE_RESELECTION_COUNTE) that is arbitrarily selected (or determined) by the terminal, and the counter value may have a positive integer.
  • the counter value may have a value of 5 or more, and the counter value may have a value of 15 or less.
  • the finite number may have a value 10 times a counter value arbitrarily selected by the terminal.
  • the terminal may reserve a plurality of resources for which V2X communication is performed, and the plurality of reserved resources may have a finite number.
  • a predefined rule e.g. 10 * SL_RESOURCE_RESELECTION_COUNTER
  • the number of subframes in one set of time and frequency resources related to transmission opportunities of the PSSCH may be given as a specific value (eg, C resel ).
  • C resel may be defined as 10 * SL_RESOURCE_RESELECTION_COUNTER (when a specific counter (eg, SL_RESOURCE_RESELECTION_COUNTER) is set), otherwise C resel may be set to 1 (ie, when SL_RESOURCE_RESELECTION_COUNTER is not set).
  • a random value of SL_RESOURCE_RESELECTION_COUNTER of 5 or more and 15 or less may be set.
  • SL_RESOURCE_RESELECTION_COUNTER when SL_RESOURCE_RESELECTION_COUNTER is 5, a total of 50 subframes may be reserved for transmission of PSSCH. For example, when SL_RESOURCE_RESELECTION_COUNTER is 15, a total of 150 subframes may be reserved for transmission of PSSCH.
  • the (appropriate) finite number (and / or TNUM_V2XSF value) is interpreted as (and / or equal to) greater than (or greater than or equal to) the SEL_CNTVAL value (and / or the value derived from the SEL_CNTVAL value).
  • One number (and / or TNUM_V2XSF value) may be interpreted as the maximum number of (possibly) reserved (/ selected) subframes (/ resources).
  • the (selected) counter value is a positive integer value state, all of the reserved (/ selected) subframes (/ resources) pass (on the time domain) Can be mitigated.
  • the V2X TX UE defines a (appropriate) finite number (e.g., can be interpreted as (the kind of) the maximum number of subframes (/ resources) that can be reserved (/ selected)), If the SEL_CNTVAL value (and / or the value derived from the SEL_CNTVAL value) is less than (the corresponding) finite number, (exceptionally) SEL_CNTVAL (and / or the number derived from the SEL_CNTVAL value (/ number) and / or smaller) It is also possible to reserve (/ select) a subframe (/ resource) of a value (/ number).
  • the terminal may perform V2X communication on the reserved number of resources (S2320). As described above, the terminal performs V2X communication on the reserved resource.
  • the terminal does not infinitely perform V2X transmission on the reserved resource. That is, the terminal may reselect the reserved transmission resource, and as described above, the (re) transmission resource (re) reservation (/ selection) operation is a range previously set (/ signaled) by the V2X TX UE (S). Triggering (at least) when a randomly selected (transmission resource (re) reservation) counter value (SEL_CNTVAL ) within (eg, "5-15") becomes "0" (and / or "negative integer value”) Can be.
  • SEL_CNTVAL randomly selected (transmission resource (re) reservation) counter value
  • the V2X terminal may perform resource reselection in a selection window.
  • resource reselection may be performed in a selection window, and the V2X terminal may not continuously perform V2X transmission during a preset number of transmission opportunities. If not, the resource reselection in the selection window may be performed.
  • (applicable) a finite number of (and / or TNUM_V2XSF) reserved (/ selected) subframes (/ resources) are (all in the time domain) passing (and / or preconfigured (/ signaling)).
  • V2X TX when the (selected) counter value is not “0” (and / or “negative integer value”) despite the subframe index (e.g., 10240 (or TNUM_V2XSF)) has passed. Allow the UE (S) to perform a transmission resource (re) reservation (/ selection) operation, but select (randomly) a new (random) transmission value of the (transmission resource (re) reservation) counter (or (transmission resource (re) reservation)) It is possible to inherit (/ hold / apply) the existing value (SEL_CNTVAL) (or the rest of the value (or a preset (/ signaled) value)) without selecting a counter value (newly). There is also.
  • SEL_CNTVAL the existing value
  • the term "transfer resource (re) reservation (/ selection) operation” is (A) V2X TX UE (S) is based on the existing (based on the pre-set (/ signaling) probability value (KEEP_P) If you decide not to retain (/ reuse) the selected (transmit) resource (or regardless of the corresponding probability value (KEEP_P)), then the (re) Reservation (/ selection) and / or (B) the V2X TX UE (S) is based on (or based on a pre-set (/ signaled) probability value (KEEP_P) (or regardless of the corresponding probability value (KEEP_P))) To maintain (/ reuse) the selected (transmit) resource (and / or (C) the same finite number as the existing (or pre-set (/ signaled) number) (e.g.
  • SEL_CNTVAL Subframes (or resources (such as)) of a value (and / or a value derived from the SEL_CNTVAL value) that is greater than (or greater than or equal to) the value) It can be interpreted as to (re) scheduling (/ Select)).
  • V2X TX UE # X (e.g., resource reservation (interval) period "P_X") causes another V2X TX (identified by PSCCH decoding) Determining whether there is a collision (/ overlapping) between the transmission resource of UE #Y reserved (/ selected) resource reservation (interval) period "P_Y" and its own reserved (/ selected) candidate resource (for example, "STEP” 2 ”) assumes (on the candidate resource) that the (finite) number ( NUM_EXTX ) of transfers it assumes (/ remembers ) is performed (or assumes (resources) the resources it reserves / selects).
  • NUM_EXTX the (finite) number of transfers it assumes (/ remembers ) is performed (or assumes (resources) the resources it reserves / selects).
  • V2X TX UE # Y (with (SUBFRAME # (N-10)) PSCCH decoding) is set to SUBFRAME # (N-10 with a resource reservation (interval) period of “1000MS”.
  • V2X TX UE # X (resource reservation (interval) cycle of “100MS”) causes SUBFRAME # N (current time point).
  • this type of monitoring is the same (frequency) that V2X TX UE # X is reserved (/ selected) by V2X TX UE # Y (in a pre-set (/ RE) TX RESOURCE) SELECTION WINDOW).
  • V2X TX UE (S) collides with the number of resources (for example, (Example # 1)) reserved (/ selected) (/ It can be interpreted that the number of resources (eg, (Example # 2)) that need to look into the future to determine the overlap may be different.
  • V2X TX UE # Y (with (SUBFRAME # (N-10)) PSCCH decoding) is set to SUBFRAME # (N with a resource reservation (interval) period of “1000MS”.
  • V2X TX UE # X resource reservation (interval) cycle of “100MS” causes SUBFRAME # N (currently When performing (re) reserving (/ selecting) a transmission resource at a time point), a candidate resource (of the same (frequency) position as V2X TX UE # Y) on SUBFRAME # (N + 90) is assumed to Finite) count (e.g., “9”) (e.g., the corresponding (finite) count is the reserved (/ selected) transmission resource of V2X TX UE # Y (e.g., SUBFRAME # (N + 990 )) Transmissions (e.g.
  • SUBFRAME # (N + 90), SUBFRAME # (N + 190)) of transmissions (which can be set to a (maximum) (integer) value where the maximum value of the monitoring subframe index does not become larger than the time point)
  • the reserved (/ selected) transmission resource of V2X TX UE # Y e.g., SUBFRAME # Whether or not (N + 990) collides with (or overlaps) may be determined.
  • the NUM_EXTX value and the FINI_SFNUM value may be set (/ signaled) independently (/ differently) (or identically).
  • the FINI_SFNUM value (/ signaling) (and / or) is set to a common value (or independent value) between V2X UEs (GROUP) (sharing the V2X resource pool) on the same carrier (/ frequency).
  • the NUM_EXTX value is set to an independent value (e.g., set by the upper layer of the terminal) (or common value) between V2X UEs (GROUP) (sharing the V2X resource pool) on the same carrier (/ frequency) ( / Signaling)).
  • GROUP common value between V2X UEs (GROUP) (sharing the V2X resource pool) on the same carrier (/ frequency) ( / Signaling)).
  • Example # 3 As an example, if the (selected) counter value is decremented per (actual) TB (/ packet) transmission by a pre-set (/ signaled) value (eg, “1”), If there is no TB (/ packet) to send to V2X TX UE # M (for long time) (on (LOW LAYER) buffer (and / or PDCP LAYER)) (and / or no (real) TB (/ packet) transmission) , The decrement of the (selected) counter value will cease, and when the TB (/ packet) to be sent (after a long time) reappears (and / or when (actual) TB (/ packet) transfer is performed), (applicable) V2X TX UE # M assumes that it still has (previously) reserved (/ selected) resources (since the (selected) counter value is a positive integer) and uses the (incorrectly) resources incorrectly. .
  • a pre-set (/ signaled) value eg, “
  • the terminal may reselect the reserved transmission resource, and the (re) transmission resource (re) reservation (/ selection) operation may be performed by the V2X TX UE (S) in a preset range (/ signaling) (for example, “5”. ⁇ 15 ”) can be triggered (at least) when a randomly selected (transmission resource (re) reservation) counter value ( SEL _ CNTVAL ) reaches" 0 "(and / or” negative integer value ").
  • the counter value may be decreased by '1', and when the counter value is 0, the UE may perform the resource rescheduling operation.
  • the transmission resource re-reservation may occur (triggered) only when the terminal actually performs transmission (on a previously reserved resource).
  • the value of the counter (which triggers resource re-reservation) is reduced only if the actual packet transmission by the terminal (on the pre-reserved resource) has to be performed, if (pre-reserved) If the counter value does not become “0” (and / or “negative integer value”) even though the number of resources has passed (on the time domain) (forever, resource rebooking has not been triggered). Deadlock problems can occur.
  • 24 is a flowchart illustrating a method for reselecting a resource by a terminal according to an embodiment of the present invention.
  • the terminal determines whether a resource reselection condition is satisfied (S2410).
  • the terminal may perform resource reselection if at least one of the plurality of resource reselection conditions is satisfied.
  • a V2X TX UE # M (where the (selected) counter value is a positive integer value state) causes a threshold (time) value above a preset (/ signaled) value.
  • the resource reselection condition of the UE is (A) when there are no more resources for V2X transmission (for example, as described above, the subframe (/ resource) reserved by itself (/ resource) (Both) '(B) if the UE has not performed packet transmission for a continuous 1 second (e.g., as described above,' before the pre-set (/ signaled) threshold time value ( (Continued) TB (/ packet) transmission is not performed '), (C) when the UE skips a predetermined number of consecutive transmission opportunities (for example, as described above,' pre-set (/ May be present when TB (/ packet) transmission is not performed (continuously) above the signaled threshold).
  • a predetermined number of consecutive transmission opportunities for example, as described above,' pre-set (/ May be present when TB (/ packet) transmission is not performed (continuously) above the signaled threshold.
  • the terminal may perform resource reselection when there are no more resources associated with the configured sidelink grant. That is, when the UE no longer has resources associated with the configured sidelink grant and there is a new MAC PDU to be transmitted to the UE, resource reselection may be triggered. (Ie, in the above-described case, the UE may perform resource reselection.)
  • a finite number of (and / or TNUM_V2XSF) reserved (/ selected) subframes (/ resources) are (all in the time domain) passing (and / or preconfigured (/ signaling)).
  • the terminal may perform resource reselection. That is, when the terminal does not perform transmission or retransmission on a continuous transmission opportunity of 1 second, resource reselection may be triggered.
  • the UE may perform resource reselection.
  • the terminal may perform resource reselection.
  • N is set to the terminal, and N may have a value of [1, 2, 3, 4, 5, 6, 7, 8, 9].
  • the terminal when skipping '5' consecutive transmission opportunities to the terminal, when the terminal is configured to perform the resource reselection, the terminal reselects the resources when the transmission does not perform for five consecutive transmission opportunities Can be performed.
  • the terminal may perform reselection for a resource on which V2X communication is performed (S2420).
  • the terminal may reselect a resource on which V2X communication is performed, and then the terminal may perform V2X communication on the selected resource.
  • the terminal if the resources for the V2X transmission no longer remains (for example, as described above, the 'subframe (/ resources) reserved by itself (/ resources) is ( All)), (B) if the UE has not performed packet transmission for a continuous 1 second (e.g., as described above, 'more than the preset (/ signaled) threshold time value (continuous) TB (/ packet) transmission is not performed '), or (C) the terminal skips a predetermined number of consecutive transmission opportunities (for example, as described above, When TB (/ packet) transmission is not performed (continuously) above the signaled threshold value '), V2X communication may be performed on the selected resource by reselecting a resource on which V2X communication is performed.
  • the resources for the V2X transmission no longer remains for example, as described above, the 'subframe (/ resources) reserved by itself (/ resources) is ( All)
  • the terminal if the UE has not performed packet transmission for a continuous 1 second (e.g., as described
  • the terminal may perform the V2X communication based on the selected resource (S2430).
  • the selected resource may mean a resource determined on the basis of a SELECTION WINDOW configured to satisfy a LATENCY REQUIREMENT (that is, a resource on a selection window that satisfies a latency request).
  • the terminal may select a subframe within a selection window based on a sensing result performed during the terminal-specific sensing interval, and the terminal may select a transmission reservation resource based on the selected subframe. And V2X communication on the reserved resource. Specific examples of performing V2X communication based on the resource selected by the terminal are as described above (or described later), and thus, detailed descriptions thereof will be omitted.
  • the term "transfer resource (re) reservation (/ selection) operation” is (A) V2X TX UE (S) is based on the existing (based on the pre-set (/ signaling) probability value (KEEP_P) If you decide not to retain (/ reuse) the selected (transmit) resource (or regardless of the corresponding probability value (KEEP_P)), then the (re) Reservation (/ selection) and / or (B) the V2X TX UE (S) is based on (or based on a pre-set (/ signaled) probability value (KEEP_P) (or regardless of the corresponding probability value (KEEP_P))) To maintain (/ reuse) the selected (transmit) resource (and / or (C) the same finite number as the existing (or pre-set (/ signaled) number) (e.g.
  • SEL_CNTVAL Subframes (or resources (such as)) of a value (and / or a value derived from the SEL_CNTVAL value) that is greater than (or greater than or equal to) the value) It can be interpreted as to (re) scheduling (/ Select)).
  • a V2X TX UE # U may be configured to perform a (selected / reserved) subframe of (or select) a transmission resource (re) reservation and / or another V2X TX UE # Z.
  • MOD (X, Y) represents a function that derives the remaining values when X is divided by Y.
  • X resource reservation
  • interval period“ P ”from the subframe (Subframes / resource) can be considered to be reserved.
  • Example # 5 As an example, ((Example # 1) and / or (Example # 2) and / or (Example # 3) and / or (Example # 4)) (let V2X UE (S)) (Finite (/ infinite) number of subframes (/ resource)))
  • the reservation (/ selection) itself is outside the SFN range (or TNUM_V2XSF range) (by SFN WRAP AROUND), but the V2X UE (S) Resource Reservation (Interval) Period (P), while keeping the odd (time) subframe (/ resources) excluded (SKIP) (and / or (finite (/ infinite)) ) Number of subframes (/ resources)) reservation (/ selection) can be operated by itself in the form of increasing the SFN range (or TNUM_V2XSF range).
  • Example # 7 shows a method for supporting an efficient (V2X message (/ TB)) transmission operation of a V2X TX UE (S).
  • the UE reserves 10 * C subframes at a resource reservation period P interval, where C may mean SL_RESOURCE_RESELECTION_COUNTER determined by MAC.
  • the UE reserves a finite number of subframes, but SL_RESOURCE_RESELECTION_COUNTER can be reduced only when the MAC PDU is transmitted. Therefore, when the upper layer stops packet generation for a specific time interval, and skips transmission in many reserved subframes, the UE no longer reserves the reserved resources and more resources for the transmission of newly arrived packets. It may not be left anymore.
  • the subframe in the second DFN range may not be divided by 100 (ie, division by 100 may result in the remainder).
  • the UE reserves a subframe for the index ⁇ 0, 100, ..., 10200, 10300, ..., 14900 ⁇ .
  • the subframe numbers from 10300 to 14900 correspond to a range beyond the DFN range, subframes for ⁇ 0, 100, ..., 10200, 60, 160, ..., 3660 ⁇ are actually reserved. Can be.
  • the terminal may extend the resource reservation.
  • the number of reserved subframes can be set independently of the number of counters.
  • the number of reserved subframes may be set smaller than the counter value.
  • the terminal may reserve a set of subframes up to the boundary of the current DFN range when resource reservation is triggered.
  • 25 is an example of a method of performing resource reservation in consideration of the above-mentioned proposal.
  • the UE may first determine a set of subframes ending before the DFN boundary and repeat resource reservation at the same resource reservation interval if more resources are needed. .
  • Proposal 1 If the terminal no longer has a reserved resource, but the SL_RESOURCE_RESELECTION_COUNTER is still greater than zero, the terminal can extend the resource reservation.
  • Proposal 2 When resource reservation is triggered, the UE can reserve a set of subframes up to the boundary of the current DFN range.
  • a V2X TX UE is configured to transmit (re) reserve (/ select) transmission resources according to Table 2 (e.g., "STEP 2/3" described above (or described later)).
  • Table 2 e.g., "STEP 2/3" described above (or described later)
  • the I_VALUE value may be set (/ signaled) in the range of (maximum) “1 ⁇ I_VALUE ⁇ 10”.
  • whether or not a particular I_VALUE value can be selected (/ allowed) is in the form of “CARRIER (/ POOL) -SPECIFIC NETWORK (PRE) CONFIGURATION” (predefined signaling (e.g. X on 10-BIT BITMAP). Bit may indicate whether the Xth I_VALUE value is selectable (/ allowed).
  • the selection restriction of a particular I_VALUE value may include (A) failing to set (/ signal) the RR_INV value of the (I_RESVAL * P_STEP ”value (by the terminal) and / or (B). ) Can be interpreted as requiring (/ signaling) another I_VALUE value (rather than I_RESVAL) that can represent the (closest) (terminal) value closest to (in fact) the desired RR_INV value.
  • the UE when transmission is performed while the UE performs sensing (in the sensing window), that is, the UE may not perform sensing (due to a half duplex problem) for a subframe in which V2X transmission is performed in the sensing window. have.
  • the UE transmits a V2X message on a subframe in which the UE cannot perform sensing and a subframe corresponding to specific periods
  • the UE transmits a V2X message based on the subframe in which the UE does not perform sensing. Will result.
  • FIG. 26 is a flowchart of a method of excluding a subframe (in a selection window) related to a subframe in which a terminal does not perform sensing according to an embodiment of the present invention.
  • the terminal selects a subframe (in a selection window) except for a subframe (in a selection window) related to the subframe in which a transmission is performed during the sensing period (S2610).
  • the terminal may select a plurality of subframes other than the subframes in the excluded selection window except for the subframes in the selection window related to the subframe in which the transmission is performed during the sensing period among the plurality of subframes in the selection window. You can select from subframes.
  • the subframe according to the resource reservation period of the selected subframe is detected by the UE. It may mean a subframe that may not be performed and a subframe that overlaps with a subframe corresponding to specific periods. For convenience of explanation, the present contents will be described below with reference to the drawings.
  • FIG. 27 illustrates an example of excluding a subframe (in a selection window) related to a subframe in which the terminal has not performed sensing.
  • the first subframe may mean a subframe in which the terminal has not performed sensing. It may be assumed that the first subframe and the subframe corresponding to the specific period are the third subframes.
  • the terminal may not select the second subframe in the selection window (that is, the selection may be excluded).
  • the terminal may exclude subframe #y within the selection window from resource reservation selection.
  • the subframe #k may correspond to a subframe in which the terminal does not perform sensing
  • the subframe #y may mean a subframe within the selection window.
  • P may mean a resource reservation period of the terminal, for example, P may have a value of 100ms.
  • J may mean a value of 0, 1, 2, ..., C _ resel -1, and C _ resel is a value of a specific counter value (for example, 10 * SL_RESOURCE_RESELECTION_COUNTER) as described above. It may mean. Since the contents of the specific counter (that is, SL_RESOURCE_RESELECTION_COUNTER) are as described above, a detailed description thereof will be omitted.
  • i can mean an element in the set that is limited by the carrier specific setting.
  • V2X TX UE (S) if in STEP 2 Is not monitored by your own V2X message transfer behavior (and / or your own V2X message transfer behavior If no other V2X TX UE (S) related PSCCH decoding and (interlinked) PSSCH DM-RS RSRP (and / or S-RSSI) measurement operations have been performed), R X in R X, Y belonging to S A , Y + RR_ INVTX * j is (And / or If it overlaps with (some) resource (s) that may be selected (/ reserved) by another V2X TX UE (S) on Rx , Y may be (additionally) excluded from the S A set.
  • RR_INVTX means its own (RESOURCE RESERVATION INTERVAL) value (set (/ signaled) from the upper layer), and “I_CANVAL” (before) “CARRIER (/ POOL) -SPECIFIC NETWORK ( It can be interpreted (limitedly) as value (s) belonging to the selectable (/ allowable) "I_VALUE SET” specified in the form PRE) CONFIGURATION ".
  • resources for example, the V2X TX UE (S) is not monitored by its V2X message transmission operation in STEP 2 (eg, Is generated) , and when determining whether to exclude (addition) of R X, Y from the set of S A , the (real) selectable (/ permissible) (I / VALUE SET) (and / or It can be interpreted as considering only “RESOURCE RESERVATION INTERVAL”).
  • the terminal may perform V2X communication based on the selected subframe (S2620).
  • the selected subframe means a resource determined on the basis of (SLECTION WINDOW) configured within a range that satisfies LATENCY REQUIREMENT (ie, a resource on a selection window that satisfies the latency request). can do.
  • the terminal may select a subframe within a selection window based on a sensing result performed during the terminal-specific sensing interval, and the terminal may select a transmission reservation resource based on the selected subframe. And V2X communication on the reserved resource.
  • the UE performing V2X communication on the selected subframe may mean that the UE performs V2X communication on the reserved subframe in association with the selected subframe.
  • Specific examples of performing V2X communication based on the resource selected by the terminal are as described above (or described later), and thus, detailed descriptions thereof will be omitted.
  • V2X TX UE (S) if in STEP 2 Is not monitored by your own V2X message transfer behavior (and / or your own V2X message transfer behavior If no other V2X TX UE (S) related PSCCH decoding and (interlinked) PSSCH DM-RS RSRP (and / or S-RSSI) measurement operations have been performed), R X in R X, Y belonging to S A , Y + RR_ INVTX * J (And / or If it overlaps with (some) resource (s) that may be selected (/ reserved) by another V2X TX UE (S) on Rx , Y may be (additionally) excluded from the S A set.
  • I_CANVAL_X is (pre-) the maximum value (s) belonging to the selectable (/ allowable) “I_VALUE SET” specified in the form “CARRIER (/ POOL) -SPECIFIC NETWORK (PRE) CONFIGURATION”. Or a minimum value or a specific value).
  • the V2X TX UE (S) if you are not monitored in STEP 2 with your own V2X message transfer behavior (and / or with your V2X message transfer behavior) From other V2X TX UE (S) related PSCCH decoding and (interlocked) PSSCH DM-RS RSRP (and / or S-RSSI) did not perform a measurement operation side), R X, Y to S A set on the (further) You can exclude it.
  • the V2X TX UE (S) if you are not monitored in STEP 2 with your own V2X message transfer behavior (and / or with your V2X message transfer behavior) From other V2X TX UE (S) related PSCCH decoding and (interlocked) PSSCH DM-RS RSRP (and / or S-RSSI) did not perform a measurement operation side), R X, Y to S A set on the (further) You can exclude it.
  • I_CANVAL_Q is a value (s) belonging to the selectable (/ allowable) “I_VALUE SET” (specified in the form “CARRIER (/ POOL) -SPECIFIC NETWORK (PRE) CONFIGURATION”) (and / Or can be set (/ signaled) to the minimum (or maximum or specific value) of the value (s) belonging to the selectable (/ permissible) "I_VALUE SET”.
  • a J value equal to the maximum possible (or minimum) “RESOURCE RESERVATION INTERVAL” (or a specific “RESOURCE RESERVATION INTERVAL” pre-set (/ signaled)) (or less than (or greater than or equal to) the derived J value.
  • the proposed method is a message (/ packet) related priority value (and / or (corresponding) carrier (/ full) related CONGESTION LEVEL value) that the V2X TX UE (S) to transmit in advance (/ signaling It may be limited to apply only if it is smaller (or larger) than the threshold.
  • V2X UE (S) effectively reflects resources (/ subframes) that are not monitored (/ sensed) by its own transmission operation in "RESOURCE EXCLUSION PROCEDURE (BASED ON PSSCH-RSRP MEASUREMENT)".
  • RESOURCE EXCLUSION PROCEDURE BASED ON PSSCH-RSRP MEASUREMENT
  • the terminal #A excludes the subframe #k existing within the selection window of the terminal.
  • P may mean a resource reservation interval of the terminal
  • j may mean 0, 1, ..., 10 * SL_RESOURCE_RESELECTION_COUNTER-1.
  • I may also mean (possible) elements in the set which are limited by carrier specific network (pre) configuration.
  • terminal #A may exclude all resources (in the terminal's selection window) that overlap with the transmission of another terminal that may be scheduled from the skipped subframe #k.
  • the set of i may be limited as ⁇ 2, 4 ⁇ , and P and SL_RESOURCE_RESELECTION_COUNTER may be set to 200 ms and 5, respectively.
  • Frame #k may be excluded from the selection.
  • the subtraction in the selection may not include the subframe in the selection window.
  • UE #a may need to exclude subframe #y within its selection window if subframe # (y + P * j) may overlap with subframe # (k + 100 * i).
  • P may refer to the resource reservation interval of the terminal, j is 0, 1, ..., (10 * SL_RESOURCE_RESELECTION_COUNTER-1), i is all (use) of the set limited by the carrier-specific network (pre) configuration Element).
  • the (increased) “(max) DFN RANGE” value is “10240 (/ 10176) * H_VAL” (or “10240 (/ 10176) * H_MAXVAL”) (and / or “MAX DFN RANGE * H_VAL” (Or “MAX DFN RANGE * H_MAXVAL”).
  • H_VAL value (/ index) (/)
  • B Setable (/ usable) H_VAL (index) range and / or
  • C Maximum value of H_VAL (/ maxindex) ( H_ MAXVAL) (and / or minimum value (Min / index) (H_ MINVAL)), such as a network (or serving cell) is defined in advance (the upper (/ physical) layer) signaling (and / or (SYNCH.
  • SOURCE terminal Via the (newly defined) field (or predefined D2D channel / signal) on the PSBCH (“CARRIER (/ POOL / CELL) -SPECIFIC (PRE) CONFIGURATION” type and / or “V2X POOL (PRE) CONFIGURATION”).
  • CARRIER / POOL / CELL
  • PRE SPECIFIC
  • V2X POOL PRE
  • Figure 31 shows an example of the case of increasing the (old) "DFN RANGE” value (for example, "10240" or “10176").
  • H_VAL and / or H_MAXVAL
  • the (incremented) “(max) DFN RANGE” value can be divided (and / or remaining) by the bitmap length (specified / signaled) relative to the V2X resource pool configuration (and / or (V2X resource)).
  • the V2X UE (S) advances the H_VAL value whenever the (existing) “(max) DFN RANGE” value (eg, “1024 (/ 10240)”) passes. Increment by the value set (/ signaled) to (for example, “1”), but from (V2X) subframe of relatively small index within (V2X) subframe (set) based on the same H_VAL value Message) transmission (and / or V2X communication).
  • “SUBFRAME INDEX” uses “LOGICAL INDEX” in a (V2X) resource pool.
  • the physical time interval may be relatively large.
  • the V2X TX UE (S) may be made to use the "RESOURCE RESERVATION INTERVAL" value as a smaller value.
  • V2X communication can be performed as follows.
  • V2V may be multiplexed with other signals / channels.
  • Tmax which means the DFN range for V2V, that is, the number of subframes that can be allocated to V2V, may be 10240 or 10176 depending on the SLSS resource configuration.
  • the length of the bitmap representing the V2V subframe for the resource pool may be 16, 20, or 100. Accordingly, as described above (eg, in case of FIG. 22), a case may occur in which the DFN range is not divided by the bitmap length unit.
  • a fundamental solution to this problem may be to change the DFN range (ie, Tmax) so that it is always divided by the bitmap length. This may mean increasing the DFN range to be a multiple of the bitmap length.
  • H-SFN hyper SFN
  • the modification period may be set by the system information.
  • An eDRX acquisition cycle may be defined to enable notification of system information update for an RRC_IDLE terminal that uses an eDRX cycle longer than or equal to the modification cycle.
  • the network may first notify the terminals about this change.
  • the network can send updated system information.
  • the terminal can immediately acquire new system information from the start of the next modification cycle using a DRX cycle less than or equal to the modification cycle.
  • SystemInformationBlockType1 may be defined as shown in Table 3 below.
  • 'hyperSFN' indicates a hyper SFN that increases by one when the SFN is wrapped, and with respect to 'eDRX-Allowed', the presence of this field indicates whether idle mode extended DRX is allowed in the cell. If there is no eDRX permission, the terminal should stop using extended DRX in idle mode.
  • V2V subframe index in the logical domain ie, excluding the SLSS subframe
  • Tmax + DFN the number of DFNs in the logical domain
  • Hmax the maximum value of H-DFN, can be configured such that the total number of potential V2V subframes Hmax * Tmax in the hyper DFN range is divided by the configured bitmap length.
  • Hmax may be set to five. (I.e. H-DFN # 5 is reset to H-DFN # 0).
  • the current H-DFN index needs to be synchronized between the eNB and the terminals as well as the terminals sharing the same resource pool. This may be signaled as part of the resource pool configuration between the eNB and the UE and may also be signaled via the PSBCH. If GNSS is a synchronization reference, the H-DFN index can be derived from the current UTC value.
  • Hyper DFN may be proposed as follows to handle the discontinuity of subframe bitmap iteration.
  • Hyper DFN can be defined to increase DFN range by Hmax time.
  • Hmax can be set as the value obtained by dividing Hmax * Tmax by the length of the V2V subframe bitmap of the resource pool.
  • the current H-DFN may be signaled as part of the resource pool configuration from the eNB. And may also be signaled via PSBCH.
  • the H max value may be fixed (on the spec) to a predefined value (without the need for additional signaling).
  • the H max value may be fixed to "25" (or “multiple of 25").
  • Table 4, Table 5, and Table 6 are the analysis data for the above.
  • (A) a preset bitmap of (specific) length (/ signaled) is repeatedly applied to specify a V2X resource pool and / or (B) ((terminal) set from a higher layer (/ signaling)
  • (periodical) transmission resource (s) based on “RESOURCE RESERVATION INTERVAL” are reserved (/ selected), (some) V2X resources and / or (V2X TX UE (S) (Some) (periodic) transmission resources reserved (/ selected) by the DL (time (/ frequency)) resources (e.g., “DL SF” and / or “(TDD) SPECIAL SF) (And / or “DWPTS”)).
  • the UE when the UE performs V2X message transmission on a specific carrier, the UE may not perform V2X message transmission using all subframes on the carrier. Accordingly, an example of a method of transmitting a V2X message in consideration of a subframe in which the terminal does not perform a V2X message transmission will be described with reference to the accompanying drawings.
  • FIG. 34 is a flowchart of a method of performing V2X communication on an allocated V2X resource pool according to an embodiment of the present invention.
  • the UE may allocate a V2X resource pool to remaining subframes other than a specific subframe (S3410).
  • the specific subframe may mean (A) SLSS subframe, (B) TDD shared carrier, DL and S (SPECIAL) subframe, or (C) reserved subframes.
  • the UE may allocate a V2X resource pool for the remaining subframes other than the SLSS subframe.
  • the SLSS subframe may be excluded from the mapping according to the (repeated) V2V full bitmap (ie, a bitmap (or information) indicating a subframe to which the V2X pool may be allocated), wherein the bitmap The length may mean 16, 20, or 100.
  • the bitmap may define which subframe is a subframe that allows V2V SA and / or data transmission and / or reception.
  • 35 schematically illustrates an example in which an SLSS subframe is excluded from a V2X transmission.
  • subframe numbers may have 0, 1, ..., 10239 (that is, 10240 subframes in total), and the V2X bitmap is repeated in units of 10 subframes. It is assumed that the V2X bitmap is [0110101101].
  • the UE may allocate the V2X logical index to subframes other than the SLSS subframe. For example, when it is assumed that subframe indexes # 3 and # 163 correspond to SLSS subframes (assuming that the SLSS subframes are repeated in units of 160 subframes), the V2X UE is assigned to subframe indexes # 3 and # 163, etc. V2X logical indexes may be allocated to the remaining subframes (that is, the remaining subframes except the SLSS subframe) (S3510).
  • the UE may assume that the V2X resource is allocated according to the V2X bitmap for the subframe allocated by the V2X logical index.
  • the V2X logical index derived through the foregoing may not correspond to an integer multiple of the V2X bitmap.
  • the V2X logical indexes are 10176 corresponding to 10240-64. May be assigned to a subframe.
  • V2X logical index may be allocated to 10176 subframes and 10 V2X bitmap periods are assumed, the logical index and the V2X bitmap period are not divided. That is, when a V2X bitmap having a period of 10 is allocated to 10176 subframes, bits may not be allocated to six subframes.
  • the UE may exclude the aforementioned number of unassigned subframes from the V2X logical index allocation (S3520).
  • the unassigned subframes may be evenly distributed (EVENLY DISTRIBUTED).
  • DL and / or S (SPECIAL) subframes may be excluded from the mapping according to the (repeated) V2V full bitmap.
  • An example in which DL and / or S (SPECIAL) subframes are excluded from V2X transmission will be described below with reference to the accompanying drawings.
  • FIG. 36 schematically illustrates an example in which DL and S (SPECIAL) subframes are excluded from a V2X transmission.
  • subframe numbers may have 0, 1, ..., 10239 (that is, 10240 subframes in total), and the V2X bitmap is repeated in units of 10 subframes. It is assumed that the V2X bitmap is [0110101101].
  • the UE may allocate a V2X logical index for subframes other than DL and / or S (SPECIAL) subframes (and / or SLSS subframes). For example, assuming that subframe index # 7 (etc.) corresponds to DL and S (SPECIAL) subframes, the V2X UE may allocate a V2X logical index to the remaining subframes except subframe index # 7 (etc.). It may be (S3610).
  • the UE may allocate V2X resources according to the V2X bitmap for the subframe allocated by the V2X logical index.
  • the UE may additionally exclude as many subframes as the number not allocated to the V2X logical index allocation (S3520).
  • the unassigned subframes may be evenly distributed (EVENLY DISTRIBUTED).
  • the resource pool is composed of several reserved subframes such that the bitmap is repeated with integers within a specific range (eg, D2D Frame Number (DFN) range).
  • a specific range eg, D2D Frame Number (DFN) range.
  • the V2X (eg, V2V) logical subframe index may not be assigned to the reserved subframe.
  • the position of the reserved subframe may be displayed in an implicit manner.
  • V2X SYNCH preset (signaled)
  • bitmap associated with the V2X resource pool configuration.
  • SIGNAL applies without distinction to DL / UL (time / frequency) resources related to WAN communication, except for transmission-related (time (/ frequency)) resources (e.g. V2X SYNCH. SUBFRAME (S)). (And / or because of the DFN WRAP AROUND problem).
  • V2X TX UE (S) (A) (part) V2X resources (specified by the bitmap) on the DL (time (/ frequency)) resources related to WAN communication is Make assumptions that are invalid (in terms of “LOGICAL INDEXING” (in terms of V2X pools)) and / or (B) reserve (by V2X TX UE (S)) on DL (time (/ frequency)) resources related to WAN communication.
  • the "LOGICAL INDEXING" (relative to the V2X pool) includes the invalid resource (eg, DL (time (/ frequency)) resource) (eg, "LOGICAL INDEX").
  • a DL (time (/ frequency)) resource eg, “DL SF” and / or “WAN communication related resource”.
  • the terminal may perform V2X communication on the allocated V2X resource pool (S2420).
  • V2X communication on the allocated V2X resource pool (S2420).
  • a specific example of the UE performing V2X communication is as described above.
  • the rule may be that a (partial) V2X resource (specified by a bitmap) and / or a (partial) (periodic) transmission resource (reserved / selected) by the V2X TX UE (S) is WAN. Not only is it located on a communication-related DL (time (/ frequency)) resource but also is not suitable for performing (pre-set (/ signaled)) V2X communication (eg, “UL SF” (and / or “UPPTS).
  • a V2X UE (S) (in base station coverage) may be configured to pre-define a "offset value for GNSS-based DFN # 0" signaled / set in advance (from a (serving) base station).
  • a channel eg, PSBCH
  • PSBCH PSBCH
  • selectable (/ allowable) I_VALUE values and / or “RESOURCE RESERVATION INTERVAL” values on the V2X resource pool (and / or (V2X) carrier) are (“CARRIER (/ POOL)-).
  • SPECIFIC NETWORK (PRE) CONFIGURATION ”) allows the V2X TX UE (S) to: (A) the minimum value of I_VALUE (or I_ MINVAL ) (or on the corresponding V2X resource pool (and / or (V2X) carrier) Maximum value) (or a preset (/ signaled) (specific) I_VALUE value) which can be derived (/ calculated) (e.g.
  • I_MINVAL * P_STEP and / or (B) “RESOURCE RESERVATION INTERVAL ”sensing operation (eg, STEP 5 in Table 2) (and / or based on a minimum (or maximum) period value (or a pre-set (/ signaled) (RESOURCE RESERVATION INTERVAL) value).
  • Energy measurement operation e.g., STEP 8 of Table 2.
  • a specific V2X resource pool is set only for P-UE (S) which performs V2X message transmission in a relatively long period (for example, “500MS”) (relative to V-UE (S)). If allowed) and the rule is applied, the P-UE (S) will perform a sensing operation (and / or energy measurement operation) based on the (applicable) period (eg, "500MS").
  • the terminal for example, in a relatively long resource reservation period (for example, 100ms or more resource reservation period) (named as "L_PER") to select a random value in the interval of 5 or more and 15 or less, You can reserve resources by multiplying by 10.
  • L_PER resource reservation period
  • S_PER resource reservation method described above in the case of a relatively short resource reservation period (for example, 20 ms and 50 ms (less than 100 ms) (named “S_PER”) may apply to L_PER coexisting on the same resource pool.
  • the terminal may not be suitable for sensing the S_PER terminal.
  • V2X UE S
  • SHORTER RESOURCE RESERVATION PERIOD / INTERVAL
  • V2X UE (S) SHORTP _ UE (S) ) which performs short period V2X message (/ traffic) transmission and V2X UE (S) of “(RELATIVELY) LONGER RESOURCE RESERVATION PERIOD (/ INTERVAL)” (and / Or (relatively) V2X UE (S) ( LONGP_UE (S) ) performing long period V2X message (/ traffic) transmission coexists)
  • FIG. 37 is a flowchart of a method for performing reservation for V2X transmission resources when resource reservation of a relatively short period (eg, 20 ms, 50 ms (less than 100 ms)) is set according to an embodiment of the present invention. .
  • a relatively short period eg, 20 ms, 50 ms (less than 100 ms)
  • the terminal may perform reservation for a relatively large number of V2X transmission resources (S3710).
  • the terminal does not reserve the resources by multiplying the selected value by multiplying the random value in the interval of 5 or more and 15 or less, 10. This means that a random value is drawn at intervals of 5 * K (where K is a positive integer of 2 or more) and 15 * K or less, and the resource is reserved by multiplying the selected value by 10.
  • the above-described counter value (value of 5 or more and 15 or less) is multiplied by, for example, 5 or 2, and then additionally multiplied by 10 to reserve resources. can do.
  • the terminal selects a random value in the interval [5 * 5,15 * 5] (that is, 5 * 2 or more and 15 * 5 or less), and multiplies by an additional 10 You can reserve as many resources.
  • the terminal may reserve more than 250 resources and not more than 750 resources.
  • the terminal may extract a random value in the interval [5 * 2, 15 * 2], and reserves additional resources multiplied by 10. According to the present example, the terminal may reserve 100 or more resources and 300 or less resources.
  • Example # 1 A finite number of subframes (of a resource reservation (interval) period) assumed (/ used) when performing transmission resource (re) reservation (/ selection) and / or C resel values in Table 2 (e.g. For example, “[10 * SL_RESOURCE_RESELECTION_COUNTER]”)).
  • the finite number of subframes (and / or C resel value) (of resource reservation (interval) period) is set relatively small.
  • (/ Signaling) e.g., has the effect of preventing excessive resource reservation (/ selection) (within a short time period)).
  • the terminal may perform V2X communication on the reserved V2X transmission resource (S3720).
  • V2X communication on the reserved V2X transmission resource S3720.
  • a detailed example of the UE performing V2X communication on the reserved V2X transmission resource is as described above.
  • 38 is a flowchart illustrating a method for performing sensing in a relatively short period when resource reservation of a short period is set according to an embodiment of the present invention.
  • the UE may determine a resource for performing V2X communication by sensing in a relatively short period in the sensing period (S3810). That is, as described above, when the terminal has a resource reservation of a short period is set (for example, resource reservation is set in intervals shorter than 100ms), the sensing (that is, S-RSSI measurement) interval is used for transmission of the terminal The resource reservation interval may be set. In other words, when the terminal is configured for a short period of resource reservation, the terminal may perform the sensing according to the short period used for the resource reservation. This will be described in more detail below.
  • V2X message priority (e.g. can be set / signaled to a relatively low (or high) priority) and / or the “PSSCH-RSRP MEASUREMENT” threshold in Table 2 STEP 5 ( And / or “0.2 * M total ” related coefficient (/ ratio) values in Table 2 STEP 6 (/ 8) (e.g. (in total (candidate) resources) after performing STEP 5 in Table 2 (within the S A set).
  • PSSCH-RSRP MEASUREMENT increase value applied when the number of resources is not met (eg , “3DB”) and / or the periodic value used for the sensing operation (eg STEP 5 in Table 2) and / or the periodic value used for the energy measurement operation (eg STEP 8 in Table 2)
  • the “100MS” value can be changed (to a relatively short (or long) value))).
  • Example # 3 I_VALUE (range) value and / or P_STEP value selectable (/ allowed) on the V2X resource pool (and / or (V2X) carrier).
  • Transmission power related (OPEN-LOOP) parameters (/ values) (eg “P O “, “ALPHA”, etc.) and / or V2X resource pools (/ carriers).
  • the V2X UE (S) may perform (transmission) resource (re) selection as follows.
  • the V2X terminal may select a transmission resource in the following manner.
  • the terminal selects resources by itself.
  • the terminal performs sensing and selects / reselects a resource based on the sensing.
  • the terminal may transmit a scheduling assignment (SA) indicating the selected / reselected resource.
  • SA scheduling assignment
  • resource selection / reselection may be triggered to the UE in subframe # (also referred to as TTI, hereinafter same) #n. Then, the terminal performs sensing between the subframe #na and the subframe #nb (a> b> 0, where a and b are integers), and selects a resource for V2X message transmission based on the result. Can be reselected.
  • subframe # also referred to as TTI, hereinafter same
  • the terminal performs sensing between the subframe #na and the subframe #nb (a> b> 0, where a and b are integers), and selects a resource for V2X message transmission based on the result. Can be reselected.
  • the a and b may be values that are set in common to the V2X terminals, or may be values that are set independently for each V2X terminals.
  • the UE may consider all of the decoded SA transmissions in the period from subframe # n-a to subframe # n-b.
  • the decoded SA may be related to data transmission in a period from subframe # n-a to subframe # n-b, and the decoded SA may be considered to be transmitted before subframe # n-a.
  • the UE that fails to perform the sensing operation in subframe #m selects subframes # (m + 100 * k) in resource selection / reselection. Can be excluded. Meanwhile, the UE may skip without performing a sensing operation in subframes used to transmit a signal.
  • the terminal After performing the sensing, the terminal selects a time / frequency resource for the PSSCH, that is, the sidelink data channel.
  • the UE may transmit a scheduling assignment (SA) in subframe # n + c.
  • C is an integer greater than or equal to 0, and may be a fixed value or a variable.
  • the UE may not require scheduling allocation transmission (ie, PSCCH transmission) in subframes whose c value is less than c min .
  • the c min may be a fixed value or a value set by a network.
  • the scheduling assignment SA transmitted in subframe # n + c may indicate associated data transmitted in subframe # n + d.
  • d may be an integer greater than or equal to c (d ⁇ c).
  • c and d may both be values of 100 or less.
  • V2X resources may be triggered.
  • the counter is decremented every transmission block transmission, and may be reset if reselection is triggered for all semi-statically selected resources.
  • the value to be reset can be chosen randomly with equal probability between a certain range, for example between 5 and 15.
  • the transport block does not match the current resource allocation even when the maximum allowed modulation and coding scheme (MCS) is used.
  • MCS modulation and coding scheme
  • selection / reselection of PSSCH resources may be selected through the following process.
  • Scheduling allocation decoding and excluding certain resources based on additional conditions may select one of the following two options.
  • the first option is to exclude those resources indicated or reserved (reserved) by the decoded scheduling assignment and resources whose DM-RS power is received above the threshold in data resources associated with the scheduling assignment.
  • the second option is to exclude those resources indicated or reserved by the decoded scheduling assignment and those whose energy measured at the data resources associated with the scheduling assignment is above a threshold.
  • the terminal may select a V2X transmission resource among the resources that are not excluded.
  • the UE may select and subset the PSSCH resources after the remaining PSSCH resources are measured and ranked based on the total received energy.
  • the terminal compares the energy in the currently selected resources with the energy in the subset, and if the energy in the currently selected resources is greater than a threshold relative to the energy in the subset, may select one of the subsets. .
  • the terminal may randomly select one resource from the subset.
  • the UE can select and subset after measuring and ranking the remaining PSSCH resources based on the total received energy.
  • the terminal may randomly select one resource from the subset.
  • the UE can select and subset after measuring and ranking the remaining PSSCH resources based on the total received energy.
  • the terminal may select a resource that minimizes fragmentation of frequency resources in the subset.
  • the '(D (/ C ) -M) '((max (/ min)))) range for example, can be interpreted as' TX RESOURCE (RE) SELECTION DURATION (/ RANGE / WINDOW)') (for example, the value 'M'
  • TX RESOURCE (RE) SELECTION DURATION (/ RANGE / WINDOW)' for example, the value 'M'
  • 'D (/ C)' wording is (exceptionally) (initially) after the resource (re) selection (/ reservation) action is triggered (e.g. SUBFRAME # N) )
  • the data (PSSCH) (which may be interpreted as the transmission time / control information (PSCCH)) may be set (/ signaled) differently.
  • the value 'C' and / or 'D' ((maximum (/ min))) range (for example, can be interpreted as 'TX RESOURCE (RE) SELECTION DURATION (/ RANGE / WINDOW)') Should be determined to satisfy (or consider) the 'LATENCY (/ QOS) REQUIREMENT', which may differ depending on the 'SERVICE TYPE' (and / or 'PRIORITY LEVEL').
  • 'UPPER LIMIT (/ LOWER BOUND)' of 'C' and / or 'D' values may not be fixed.
  • the 'UPPER LIMIT (/ LOWER BOUND)' may be set (/ signaled) differently according to 'PRIORITY LEVEL' (and / or 'SERVICE TYPE' and / or 'LATENCY (/ QOS) REQUIREMENT'). Can be.
  • the (transmit) resource (re) selection operation may be triggered.
  • the maximum (and / or minimum) or range eg 'TX RESOURCE (RE) SELECTION DURATION (/ RANGE / WINDOW)
  • Possible) is the time (or packet (/ message)) at which a packet (/ message) arrives (or receives) (or transmitted) on a 'LOW LAYER) buffer' (and / or 'PDCP LAYER').
  • Point in time ('M') and / or (where the predefined (/ signaling) condition is met) point at which the (transfer) resource (re) selection action is triggered ('N') and / or 'LATENCY REQUIREMENT' ( 'L') (e.g. '100MS') and / or 'part of PPPP' (e.g.) different (partly) by 'PPPP' (e.g.
  • 'LATENCY REQUIREMENT' packets Can be determined in consideration of the setting (if allowed).
  • the maximum value (and / or minimum value) of the value 'D' (and / or 'C') is determined as '(L-ABS (MN))' or 'MIN (L, (L').
  • ABS (MN))) (where, for example,' MIN (X, Y) 'and' ABS (Z) 'are functions that derive the minimum value among' X 'and' Y ', respectively, the absolute value of' Z ' Value, or 'D' (and / or 'C') ranges from '(L-ABS (MN)) ⁇ D (/ C) ⁇ 100 (/' LATENCY REQUIREMENT ')' (or '(L-ABS (MN)) ⁇ D (/ C) ⁇ 100 (/' LATENCY REQUIREMENT ')').
  • the maximum (and / or minimum) value of the 'D' (and / or 'C') value is calculated (/ determined), taking into account the retransmission of a particular (one) 'TB (/ packet / message)'. ), You may need to subtract the predefined 'MARGIN (/ OFFSET)' value (' MAG_VAL ') from the 'L' value.
  • the maximum value (and / or minimum value) of the value 'D' (and / or 'C') is' ((L-MAG_VAL)-ABS (MN)) 'or' MIN ((L-MAG_VAL), ((L-MAG_VAL)-ABS (MN))) '.
  • the 'MAG_VAL' value may have a 'DEPENDENCY' (eg, the 'MAG_VAL' value increases as the number of retransmissions increases).
  • the rule may be triggered by a '(transmit) resource (re) selection operation' triggered (as a pre-defined (/ signaled) condition is met)) and the '(LOW LAYER) buffer' (and / or It may be limitedly applied only when there is a packet (/ message) (or transmitted / generated) on PDCP LAYER (or when a packet (/ message) is generated).
  • the maximum value of the 'D' (and / or 'C') value (described above) (eg, '(L-ABS (MN))', '100 (/' LATENCY REQUIREMENT ')' Subsequent resources, including (or not including) time points corresponding to), are assumed to be unavailable and excluded (from (re) selectable candidate resources (on 'STEP 3 (/ 2)')). You can do that.
  • the 'C' (and / or 'D') value e.g., the 'C' time point is the (first) control (/ after the (transmit) resource (re) selection action is triggered ('N').
  • the minimum value ( C_MIN ) (for example, 'minimum value') of the information (PSCCH) which can be interpreted as the time point at which transmission is performed is determined in consideration of the 'PROCESSING TIME' of the terminal (for example, '4MS').
  • the sensing operation and / or (transmission) resource (re) selection (/ reservation) operation (and / or V2X message transmission)
  • the sensing operation and / or (transmission) resource (re) selection (/ reservation) operation (and / or V2X message transmission)
  • the (applicable) condition is (A) when transmitting a V2X message of 'LATENCY REQUIREMENT' shorter (or longer) than a preset (/ signaled) threshold (and / or pre-set (/ signaling).
  • PPPP value (/ range) for V2X message
  • the transmission may be protected by selecting a relatively high (or low) PPPP value (/ range), where, for example, a transmission based on a high (or low) PPPP value (/ range) may be performed by another terminal.
  • Selectable ((max / min)) section (/ range) (/ SELECTTION WINDOW) and / or (re) selected (or reserved) range to select a random value (or draw) (And / or coefficients multiplied by the corresponding random value (to derive the C_RESEL value [1/2/3])) and / or the candidate (transmit) resource exclusion based on the resource reservation period and / or the PSSCH-RSRP threshold.
  • '(TIMER) EXPIRATION CONDITION' relating to (transmission) resource (re) selection may be defined when the following (some) conditions are met (simultaneously).
  • the V2X UE causes (actually) (assuming (transmit) resource (re) selection operation has been triggered) only when (sometimes) the following (some) conditions are satisfied (simultaneously): Transmit) resource (re) selection operation.
  • the counter value (which is decremented by a preset value (e.g., '1') for every TB transmission) is changed to 'EXPIRATION CONDITION' (eg, the counter value is '0' ( And / or changed to 'negative value') (and / or '(transmitted) resource (re) select action' was triggered (as a pre-defined (/ signaled) condition is met)).
  • the V2X UE (S) may be allowed to perform (transmit) resource (re) reservation.
  • d may be a value less than or equal to d max .
  • d max may be determined depending on the priority (priority) such as the terminal / data / service type.
  • the UE may inform whether to reuse frequency resources for signals transmitted in subframe # n + d for potential transmission of other transport blocks in subframe # n + e.
  • e is an integer and has a relationship of d ⁇ e.
  • the terminal may explicitly or implicitly inform the reuse.
  • the e value may be one value or a plurality of values.
  • it may be informed that frequency resources for signals transmitted in subframe # n + d are not used.
  • the receiving terminal receiving the V2X signal decodes the scheduling assignment (SA) transmitted by the transmitting terminal transmitting the V2X signal.
  • SA scheduling assignment
  • P may be 100.
  • the J value may be explicitly signaled by the scheduling assignment or may be a fixed value (eg, 1).
  • the i value may be explicitly signaled by the scheduling assignment, or may be a preset value or a fixed value. Alternatively, the i value may be an integer between 0 and 10.
  • the value “I” is set in advance (/ signaled) “[0, 1,... , 10] ”is assumed to be selected (4 bits) and / or the value of“ J ”(see J above) is fixed to“ 1 ”.
  • the V2X MESSAGE generation period is changed according to a predefined parameter (for example, speed / (going) direction change amount, etc.), so that the V2X TX UE (S) generates a (own) V2X MESSAGE generation period. If it is difficult to predict accurately, it may not be efficient to reserve (future) resources according to the above method.
  • the V2X RX UE (S) if a particular V2X TX UE (S) signaled the "I" value (on the SA field) to "2""
  • the same frequency resource ( HARD_RSC ) assigned (/ scheduled) via SA (on the corresponding T) in TTI # (N + D) ”,“ TTI # (N + D + 2 * P) ” is called“ EXPLICIT ”(or HARD).
  • the rule (And / or SOFT_RSC reservations) are pre-set (/ signaled) features Only applicable to RESOURCE ALLOCATION MODE (e.g., RANDOM RESOURCE SELECTION of MODE 1 and / or P-UE (not applicable to RESOURCE SELECTION based on / PARTIAL SENSING)). If this is applied, the V2X TX UE (S) may select a candidate according to the “DM-RS POWER / ENERGY MEASUREMENT” value for HARD_RSC and SOFT_RSC of another V2X TX UE (S) (determined based on SA decoding).
  • HARD_RSC related threshold HARD_ TH
  • SOFT_RSC SOFT_ TH
  • signaling e.g., HARD_RSC can be interpreted to be protected with a higher priority than SOFT_RSC. Can be).
  • SOFT_RSC relevant threshold is set to form an offset value (HARD_ THOFF) about the HARD_RSC (/ signaling) (and / or HARD_TH relevant threshold is set to the offset value (SOFT_ THOFF) form about a SOFT_RSC ( / Signaling)).
  • HARD_THOFF the offset value
  • SOFT_ THOFF the offset value
  • V2X TX UE (S) is to determine the ((applicable) SA on the point of time based on all“ I ”values).
  • HARD_THOFF value is set (/ signaled) to “infinity (or relatively large)”
  • SOFT_RSC of the corresponding V2X TX UE (S)
  • V2X MESSAGE PRIORITY (and / or V2X MESSAGE PRIORITY to be transmitted by the other V2X TX UE (S) identified based on SA decoding) and / or (B) (measured) “CONGESTION LEVEL
  • Different thresholds e.g., HARD_TH, SOFT_TH
  • offset values e.g., HARD_THOFF (or SOFT_THOFF)
  • V2X MESSAGE PRIORITY and / or the V2X MESSAGE PRIORITY you wish to transmit
  • D the (measured) “CONGESTION LEVEL” of the other V2X TX UE (S) identified by the For example, HARD_TH, SOFT_TH) (or an offset value (eg, HARD_THOFF (or SOFT_THOFF))) may be adjusted.
  • the V2X TX UE (S) is set in advance to the (DM-RS POWER / ENERGY MEASUREMENT) value associated with the HARD_RSC and SOFT_RSC of the other V2X TX UE (S determined based on the SA decoding) (/ signaling
  • the different offset values may be applied to determine whether the candidate resource is a selectable resource or a resource to be excluded (Step 2 of Table 2).
  • the HARD_RSC related offset value (eg, assumed to be “negative value”) is set larger (or smaller) than that of SOFT_RSC (/ signaling) (eg, HARD_RSC is relatively higher than SOFT_RSC). May be interpreted as being protected by priority).
  • V2X MESSAGE PRIORITY and / or V2X MESSAGE PRIORITY to be transmitted by the other V2X TX UE (S) identified based on SA decoding) and / or (B) (measured) “CONGESTION LEVEL V2X MESSAGE PRIORITY (and / or V2X MESSAGE PRIORITY of other V2X TX UE (S) identified based on (/ signaling) (and / or (C) SA decoding) ) And / or (D) the (measured) offset value may be adjusted depending on the (measured) “CONGESTION LEVEL”.
  • the V2X TX UE (S) selects (reserves) SA TX related resources, it is linked with data transmission (s) on HARD_RSC and SOFT_RSC of another V2X TX UE (S) (determined based on SA decoding).
  • SA transmission resource (s) it is a (SA) candidate resource that is selectable by applying different “DM-RS POWER / ENERGY MEASUREMENT” thresholds (or offset values) that have been (preferably) pre-set (/ signaled). You may want to determine if it is a resource to be excluded.
  • the "TIME GAP" (range) value between the SA transmission time and the interworking data transmission time is different depending on which resource type (eg, HARD_RSC, SOFT_RSC) the data is transmitted.
  • the V2X message transmission period (eg, “1000MS”) of the PEDESTRIAN UE ( P- UE ) is that of the VEHICLE UE ( V- UE ) (when considering the relatively slow travel speed and / or the need for battery saving). It can be set (/ signaled) relatively long compared to (eg, “100MS”).
  • the “I” value on the SA field points to a specific value (or “RESERVED STATE”) that has been previously set (/ signaled), so that another V2X RX UE ( S) allows (A) (applicable) SA (and / or interlocked data) transmissions to be interpreted as being performed by the P-UE and / or (B) (scheduled) SA-based (scheduled) resources It can be interpreted as being reserved at a predetermined (/ signaled) (relatively long) period (relative to V-UE).
  • V2X TX UE allows (A) if multiple (SIDELINK ( SL )) SPS PROCESS (/ CONFIGURATION) are simultaneously associated with different service types and / or V2X MESSAGE PRIORITY.
  • V2X TX UE S
  • S V2X TX UE
  • V2X TX UE changes its "SYNCHRONIZATION SOURCE"
  • (A) (if the remaining "LATENCY" value is less than the preset (/ signaled) threshold) transmission resources Define for random selection (/ reservation) (e.g., randomly selected resources should only be used for transmission of a preset (/ signaling) number of "TRANSPORT BLOCK ( TB )", and then sensing-based selection (/ reservation) And / or (B) select a transmission resource (/ reserve) after performing a sensing operation during a pre-set (/ signaled) time period. It can be defined to.
  • a V2X TX UE may cause a plurality of (other) “SYNCHRONIZATION SOURCE” related communications (including the current “SYNCHRONIZATION SOURCE”) (based on a preset (/ signaled) value). If the SYNCHRONIZATION SOURCE is changed to one of them, the sensing result value (related to the changed SYNCHRONIZATION SOURCE) may be used to select (/ reserve) a transmission resource.
  • a V2X UE may be configured to (A) pre-set (/ signal) the same (or (time (/ frequency))) synchronization difference with the same (or (time (/ frequency))) synchronization. Define to report how many carriers are capable of simultaneous receive (/ transmit) less than the threshold and / or (time (/ frequency)) synchronization differences with different (or (time (frequency))) synchronization It can be defined to report (independently) how many carriers are capable of simultaneous reception (/ transmission) for how many carriers greater than the set (/ signaled) threshold.
  • the (serving) base station that has received such (capability) information sets the appropriate number of carriers for V2X communication (receive / transmit) in consideration of the capability of the V2X UE (S). / Signaling).
  • the (serving) base station may determine different MCS (range) values according to the absolute speed of the V2X UE (S) and / or “SYNCHRONIZATION SOURCE TYPE (eg, GNSS, ENB)” and The relevant information may be signaled (to the V2X UE (S)) so that the V2X TX operation of the number of RESOURCE BLOCKs (RBs) and / or the number of (HARQ) retransmissions is performed.
  • the (serving) base station may adjust the “location based pool size” based on the speed (/ location) information reported from the V2X UE (S) (in its coverage).
  • the (serving) base station sets (/ signals) the “location based pool size” information for each speed (range) to the V2X UE S (in its own coverage), and the V2X UE S It is possible to apply (/ use) "location based pool size” information corresponding to its speed to perform V2X communication.
  • the V2X TX UE (S) operate the sensing-based resource (re) selection (eg, STEP 2/3 in Table 2) according to the following (some) method.
  • the LIM_TIMEWIN value is (A) V2X MESSAGE PRIORITY which V2X TX UE (S) wants to transmit and / or (B) (measured) CONGESTION LEVEL and / or (C) V2X MESSAGE (/ SERVICE) related TARGET LATENCY (/ RELIABILITY) It can be adjusted (or set differently) depending on the REQUIREMENT etc.
  • Example # 17-1 NUM_RETX (relative to a specific TB) of (non-excluded) resources ( NOEX _RSC ) derived as a result of performing STEP 2 (eg, OPTION 2-1).
  • CS INDEX 0
  • S V2X TX UEs
  • the V2X TX UE may be configured to define a predefined rule (eg, in a pre-set (/ signaled) CS SET (and / or OCC SET). It is possible to select a (one) CS (and / or OCC) value according to the random selection method).
  • the CS (INDEX) SET may be set (/ signaling) to "CS INDEX 0, 3, 6, 9".
  • the V2X RX UE (S) is (all) CS (and / or OCC) in the corresponding CS SET (and / or OCC SET) (because it does not know exactly which value the V2X TX UE (S) chose). It performs a blind detection ( BD ) operation for.
  • the CS (and / or OCC) value that the V2X TX UE (S) selects in the CS SET (and / or OCC SET) is (A) (V2V) subframe (/ slot) index and / Or (B) a V2X TX UE ID (or (TARGET) V2X RX UE ID) and / or (C) an ID (x bit) transmitted on the PSCCH as an input parameter (/ seed value) Is defined to be randomized (or hopped) by the (and / or the CS SET (and / or OCC SET) (configuration) of the V2X TX UE (S) is (D) (V2V) subframe (/ slot) index and / Or (E) a V2X TX UE ID (or (TARGET) V2X RX UE ID) and / or (F) an ID (x bit) transmitted on the PSCCH as an input parameter (/ seed value) )
  • the CS SET (and / or OCC SET) (configuration) is set differently according to the V2X MESSAGE PRIORITY (to be transmitted by the V2X TX UE (S)) and / or the (measured) CONGESTION LEVEL, etc.
  • V2X MESSAGE PRIORITY to be transmitted by the V2X TX UE (S)
  • the V2X TX UE (S) the V2X TX UE (S)
  • the V2X TX UE (S) the V2X TX UE (S)
  • the V2X RX UE (S) when the above rule is applied
  • one sub from (serving) base station
  • the maximum number of BDs to be performed (by the V2X RX UE (S)) within a frame may be set (/ signaled).
  • the V2X UE (S) may allow the BD number information that it can perform to the maximum in one subframe through the predefined signaling (to the (serving) base station) through the predefined signaling.
  • a CS field (eg, “3 bits”) may be defined on the PSCCH (when applicable rule is applied), and the corresponding CS field value is previously set by the V2X TX UE (S) (/ Predefined with an input parameter (and / or SELCS_VAL value) by the selected (one) CS value ( SELCS _VAL ) according to a predefined rule (e.g. random selection method) within the signaled CS SET PSSCH DM-RS CS (in conjunction with PSCCH) according to the corresponding (specified) CS field value, by means of derived (/ calculated) values based on randomized (randomized / hopping) functions The value can be set (/ determined).
  • a predefined rule e.g. random selection method
  • the PSSCH DM-RS CS value (in conjunction with the PSCCH) (when the rule is applied) does not further define a CS field (eg, “3 bits”) on the PSCCH.
  • SELCS_VAL PSCCH DM-RS CS value selected according to a predefined rule (e.g.
  • the PSSCH SCRAMBLING SEQUENCE GENERATOR sets the CS field value (on the PSCCH) and / or the V2X TX UE ID (or (TARGET) V2X RX UE ID (or X bit ID)) and / or ( V2V) can be initialized according to the subframe (/ slot) index).
  • PSCCH and / or (interlocked) PSSCH related (A) (DM-RS) SEQUENCE GENERATION RULE and / or (B) (DM-RS) CS (/ OCC) INDEX SELECTION (/ DETERMINATION ) RULE and / or (C) GROUP / SEQUENCE HOPPING RULE can be defined as shown in Table 7 and Table 8.
  • DM-RS proposed schemes
  • SEQUENCE SEQUENCE (/ CS (/ OCC) INDEX) (and / or interference) when PSCCH and / or PSSCH transmission resources (some or all) overlap between different terminals
  • the PSCCH and / or (linked) PSSCH related (A) (DM-RS) SEQUENCE GENERATION RULE and / or (B) (DM-RS) CS (/ An example of OCC) INDEX SELECTION (/ DETERMINATION) RULE and / or (C) GROUP / SEQUENCE HOPPING RULE will be described.
  • A (DM-RS) SEQUENCE GENERATION RULE and / or (B) (DM-RS) CS (/ An example of OCC) INDEX SELECTION (/ DETERMINATION) RULE and / or (C) GROUP / SEQUENCE HOPPING RULE
  • the normal CP may be supported in the V2V WI, and the destination ID may not be transmitted through the SA.
  • 16 CRC bits from the SA may be used to generate the PSSCH DMRS sequence and the data scrambling sequence.
  • N x may mean X bits in the SA used to generate the PSSCH DMRS sequence.
  • a bit (field) used for (linked) PSSCH DM-RS CS index (/ value) determination eg, 16-bit CRC (C 0 , C 1 ,... C 15 ), 2 bits that are preset (/ signaled) (or randomly selected) among (3) bit values of “C 12 , C 13 , C 14 ” are selected from the selected PSCCH CS index (/ value) (eg , “2 bits”) can be used for SCRAMBLING.
  • (A) the (final) 16-bit CRC of the PSCCH is “C 0 , C 1 ,...
  • the LSB (for example, the PSSCH DM-RS OCC index (/ value) may be changed if the corresponding rule is applied) among the 16-bit CRCs (C 0 , C 1 ,..., C 15 ) of the PSCCH ( Or MSB) 2 bits (and / or 2 bits of a preset (/ signaled) (or randomly selected) specific position) to be SCRAMBLING to the selected PSCCH CS index (/ value) (eg, “2 bits”).
  • the PSSCH DM-RS OCC index may be changed if the corresponding rule is applied
  • the PSCCH Or MSB 2 bits (and / or 2 bits of a preset (/ signaled) (or randomly selected) specific position) to be SCRAMBLING to the selected PSCCH CS index (/ value) (eg, “2 bits”).
  • the (some) modified 16-bit CRC with (partly) the SCRAMBLING operation will be the (final) CRC of the PSCCH and / or (B) the (final) of the PSCCH.
  • the 16-bit CRC indicates “C 0 , C 1 ,... , Keep (/ apply) a C 15 ”value (for example, only the CRC (and / or / or bit (field)) used to determine the (linked) PSSCH DM-RS CS index (/ value) It can be considered as changed by the SCRAMBLING operation.
  • 16 bits (different) for SCRAMBLING use are pre-set (/ signaled) for each PSCCH CS index (/ value) (for example, “2 bits”), and the terminal causes (A) the selected PSCCH CS index.
  • S may be defined as
  • FRA_INRETX field in analogy LVRB form of a conventional LTE system
  • RESOURCE INDICATION VALUE (RIV) value PSSCH transmission-related
  • A start subchannel index (/ location) information (SUB_START) and / or It may be defined in the form of informing the subchannel length (/ number) information ( SUB_LENGTH ) continuously allocated (/ positioned) (on a frequency domain).
  • SUB_LENGTH start index (/ location) information of the subchannel in which the second PSSCH transmission is performed.
  • SECDATA _ SUBST and / or (B) SUB_LENGTH may be interpreted as subchannel length (/ number) information ( SFDATA _ SUBLN ) used for first and second PSSCH transmissions.
  • the start index (/ location) information ( FIRDATA _ SUBST ) of the subchannel on which the first PSSCH transmission is performed is defined in advance by the receiving terminal (rather than being directly signaled through the FRA_INRETX field).
  • the following describes an example of the SCI FOMRAT configuration field (s) used in the MODE2_SCH operation and / or (B) the DCI FORMAT configuration field (s) used in the MODE1_DYN operation.
  • SCI has 1) PRIORITY: 3 bits, 2) Resource reservation: 4 bits, 3) MCS: 5 bits, 4) CRC: 16 bits 5) Retransmission index (RETX_INDEX): 1 bit, 6) Time gap between transmission initiation and retransmission (TGAP_INIRETX): 4 bits, 7) Frequency resource location (FRA_INRETX) of transmission start and retransmission: 8 bits, 8) Reserved bit (RSV_BIT): 7 bits may be set.
  • DCI is: 1) CIF: 3 bits, 2) lowest index of subchannel allocated to start of transmission (PSCCH_RA): 5 bits, 3) time gap between start of transmission and retransmission (as SA content): 4 bits, 4) start of transmission And frequency resource location (FRA_INRETX) of retransmission: 8 bits.
  • Q the “Q” bit
  • the remaining number of bits is not necessary analysis information related bits (/ treated).
  • Example # 20-2 As an example, when two PSSCH transmissions are configured (/ signaled) for a particular (one) TB transmission, (actually) assuming that the (necessary) FRA_INRETX field size is "Q" bit, Multiple (part or all) SECDATA_SUBST values (preset (/ signaled)) that can be specified together with a specific (single) FDATA_SUBLN (or SFDATA_SUBLN) value (required) are interpreted as a STATE (or value) for unnecessary information. Can be considered).
  • Example # 20-3 As an example, for a specific (one) TB transmission, when one PSSCH transmission is configured (/ signaled), the V2X RX UE (S) may transmit (via corresponding) V2X TX through the TGAP_INIRETX field. Since the UE can determine whether to perform one or two PSSCH transmissions (for a specific (one) TB), the RETX_INDEX related STATE (or value) can be interpreted (/ regarded) as unnecessary information.
  • a RETX_INDEX related value (or STATE) is a pre-set (/ signaled) (specific) value (or STATE).
  • a corresponding (specific) value (or STATE) (relating to RETX_INDEX) may be used for the purpose of “VIRTUAL CRC”.
  • Example # 20-4 As an example, some bits that are preset (/ signaled) among RSV_BIT field related bits (eg, “7 bits”) are interpreted as unnecessary information related bits (or values). Can be.
  • DM-RS SEQUENCE (/ CS (/ OCC) INDEX) Mitigates COLLISION problems (e.g., through the operation) the PSCCH CRC is randomized, which (finally) results in PSSCH (DM-RS) SEQUENCE ( / CS (/ OCC) INDEX, etc.), where, for example, the above-described unnecessary information related STATE (or value) and / or bit generation (for example, specific (one) TB transmission is performed.
  • one PSSCH transmission is established (/ signaled) is only one example, and the (some or all) proposed method of the present invention (STATE (or value) related to unnecessary information and / or bits generated)
  • STATE or value related to unnecessary information and / or bits generated
  • the FRA_INRETX size being changed (depending on the total number of subchannels (K) that make up the V2V resource pool (in one subframe) (pre-set / signaled).
  • the (additional) bits generated by changing the size of FRA_INRETX may be considered as unnecessary information related bits).
  • the 16-bit CRC (C 0 , C 1 ,..., C 15 ) of the PSCCH is randomized (/ 15 ) through a corresponding randomization operation of the unnecessary information related STATE (or value) and / or bits. Change) and finally the PSSCH DM-RS CS (/ SEQUENCE / OCC) (index) is also randomized (/ change) (see Table 7 and / or Table 8).
  • a transmitting terminal may be configured to generate a random information related STATE (or value) and / or a randomly selected value (and / or ((serving)) from a base station (or network) (described above). ) Can be set as a preset (/ signaled value).
  • the unnecessary information related STATE (or value) and / or bit by bit for example, (example # 20-1), (example # 20-2), (example # 20-3)) , (Example # 20-4) may be defined (/ signaled) differently under the condition that these rules apply to.
  • the number of subchannels (/ signaled) set to resource pool (for V2X communication) is “1” (or / or for one (1) TB transmission, one PSSCH transmission is configured).
  • the size of FRA_INRETX (actually used) will be “0”, so STATE (or value) for unnecessary information of (Example # 20-3) (for example, STATE (or value) for RETX_INDEX) ) And / or allow the rule to be applied to bits, and in other cases (eg, for V2X communication), the number of subchannels (/ signaled) into the resource pool is not "1" (and / or If greater than “1” (and / or for one (1) TB transmission, one PSSCH transmission is set up (/ signaled)), then (Example # 20-2) (for example (actually Multiple (part or all) (preset (/ signaled)) that can be specified with a specific (one) FDATA_SUBLN value
  • This rule can be applied to STATE (or value) and / or bits of unnecessary information related to a plurality of (some or all) SECDATA_SUBST values (or STATEs) that can be specified together (preset / signaled). There is also.
  • a transmitting terminal may be configured to transmit (A) the unnecessary information related STATE (or value) and / or bits (A) to transmit (or (target) receive) a terminal identifier and / or (B). Specified by a derived (/ calculated) value based on a predefined (randomized / hopped) function with the selected PSCCH CS index (/ value) (e.g., "2 bits") as an input parameter ( Or (C) transmit (or (target) receive) a terminal identifier and / or (D) select a value derived by a selected PSCCH CS index (/ value) (eg, “2 bits”) or the like. .
  • the (bit) position that should be specified in) is set (/ signaled) in advance and / or (B) “(Q-5-PC_SELCSBIT)” (and / or “(Q-CEILING (LOG 2 (K)))- PC_SELCSBIT) ”), so that the remaining bits (eg,“ 1 ”bits) can be set to ZERO PADDING (or to a preset value (/ signaled)).
  • a PSCCH CRC used to determine a parameter such as a PSSCH-related (DM-RS) SEQUENCE (/ CS (/ OCC) INDEX, etc. transmitted at a specific time point may be transmitted in the form of (FDM) in which (PSCCH and (linked) Case) may be defined as a PSCCH CRC transmitted at the same time point as the PSSCH (and / or a PSCCH CRC transmitted together for (requiredly) for PSSCH transmission).
  • FDM PSCCH and (linked) Case
  • examples of the proposed scheme described above may also be regarded as a kind of proposed schemes as they may be included as one of the implementation methods of the present invention.
  • some proposal schemes may be implemented in combination (or merge).
  • the present invention has been described a proposal method based on the 3GPP LTE system for convenience of description, the scope of the system to which the proposed method is applied can be extended to other systems in addition to the 3GPP LTE system.
  • the proposed schemes of the present invention can be extended and applied for D2D communication.
  • D2D communication means that the UE communicates directly with another UE using a wireless channel, where, for example, the UE means a terminal of a user, but network equipment such as a base station is used for communication between UEs. Therefore, when transmitting / receiving a signal, it can also be regarded as a kind of UE. Also, as an example, the proposed schemes of the present invention may be limitedly applied only to the MODE 2 V2X operation (and / or the MODE 1 V2X operation).
  • the proposed schemes of the present invention ('(trans) resource (re) selection operation' is triggered (as the predefined (/ signaled) condition is satisfied)) '(LOW LAYER) buffer' ( And / or if a packet (/ message) (to be transmitted or generated) is present on (or 'PDCP LAYER') (or a packet (/ message) is generated) (or '(LOW LAYER) buffer' (and /
  • the present invention may be limited to the case where the packet (to be transmitted or generated) (/ message) does not exist (or the packet (/ message) is not generated) on the 'PDCP LAYER').
  • the proposed schemes of the present invention may be limitedly applied only when the PSCCH and the (used) PSSCH are not located (or located) in the adjacent RB (S) on the same subframe.
  • the proposed schemes of the present invention not only V2V MODE 1 (/ MODE 2) DYNAMIC SCHEDULING operation but also V2V MODE 1 (/ MODE 2) SEMI-PERSISTENT SCHEDULING ( SPS ) operation (and / or V2X MODE 1 (/ MODE). 2) DYNAMIC SCHEDULING operation and / or V2X MODE 1 (/ MODE 2) SPS operation) can be extended.
  • "transmission resource selection" wording may be interpreted as (extended) "transmission resource (re) reservation”.
  • 39 is a block diagram illustrating a terminal in which an embodiment of the present invention is implemented.
  • the terminal 1100 includes a processor 1110, a memory 1120, and an RF unit 1130.
  • the processor 1110 may execute a function / operation / method described by the present invention. For example, the processor 1110 may perform a sensing during a terminal-specific sensing period, select a resource for V2X communication, and perform V2X communication based on the selected resource.
  • the processor 1110 may select a resource for performing V2X communication within a range satisfying a latency request and perform V2X communication based on the selected resource.
  • the processor 1110 selects a resource for performing the V2X message transmission by sensing in a subchannel unit having a size corresponding to the size of the subchannel used for V2X message transmission, and based on the selected resource.
  • the V2X message transmission may be performed.
  • the processor 1110 may make a reservation for a finite number of resources on which V2X communication is performed and perform the V2X communication on the reserved finite number of resources.
  • the processor 1110 determines whether a resource reselection condition is satisfied, and if the resource reselection condition is satisfied, performs a reselection for a resource on which vehicle-to-X communication is performed. And perform the V2X communication based on the selected resource.
  • the processor 1110 may select a subframe other than the subframe related to the subframe in which the transmission is performed during the sensing period in the selection period and perform V2X communication based on the selected subframe.
  • the processor 1110 may allocate a V2X resource pool to the remaining subframes except for a specific subframe and perform V2X communication on the allocated V2X resource pool.
  • the RF unit 1130 is connected to the processor 1110 to transmit and receive a radio signal.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

Abstract

L'invention concerne un procédé de fonctionnement véhicule à X (V2X) mis en oeuvre par un terminal V2X dans un système de communication sans fil, ce procédé consistant : à sélectionner une ressource à utiliser pour effectuer une communication V2X sur une plage respectant une condition de latence ; et à effectuer une communication V2X en fonction de la ressource sélectionnée.
PCT/KR2017/003845 2016-04-07 2017-04-07 Procédé de sélection de ressource à utiliser pour effectuer une communication v2x sur une plage respectant une condition de latence dans un système de communication sans fil, et terminal mettant en oeuvre ce procédé WO2017176098A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP17779398.1A EP3432657B1 (fr) 2016-04-07 2017-04-07 Procédé de sélection de ressource à utiliser pour effectuer une communication v2x sur une plage respectant une condition de latence dans un système de communication sans fil, et terminal mettant en oeuvre ce procédé
US16/091,891 US20190110177A1 (en) 2016-04-07 2017-04-07 Method for selecting resource to be used for performing v2x communication within range satisfying latency requirement in wireless communication system, and terminal using same
EP21189542.0A EP3923647B1 (fr) 2016-04-07 2017-04-07 Procédé et terminal de sélection de ressource à utiliser pour effectuer une communication v2x basé sur détection supplémentaire
KR1020187028578A KR102158628B1 (ko) 2016-04-07 2017-04-07 무선 통신 시스템에서 레이턴시 요구를 만족시키는 범위 내에서 v2x 통신을 수행할 자원을 선택하는 방법 및 상기 방법을 이용하는 단말
US16/362,007 US10536826B2 (en) 2016-04-07 2019-03-22 Method for selecting resource to be used for performing V2X communication within range satisfying latency requirement in wireless communication system, and terminal using same
US18/098,413 US20230156442A1 (en) 2016-04-07 2023-01-18 Method for selecting resource to be used for performing v2x communication within range satisfying latency requirement in wireless communication system, and terminal using same

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US16/362,007 Continuation US10536826B2 (en) 2016-04-07 2019-03-22 Method for selecting resource to be used for performing V2X communication within range satisfying latency requirement in wireless communication system, and terminal using same
US18/098,413 Continuation US20230156442A1 (en) 2016-04-07 2023-01-18 Method for selecting resource to be used for performing v2x communication within range satisfying latency requirement in wireless communication system, and terminal using same

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WO2017176099A1 (fr) 2017-10-12
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WO2017176095A1 (fr) 2017-10-12
CA3036351C (fr) 2022-08-09

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