WO2017171529A1 - 무선 통신 시스템에서 단말에 의해 수행되는 v2x 전송 자원 선택 방법 및 상기 방법을 이용하는 단말 - Google Patents
무선 통신 시스템에서 단말에 의해 수행되는 v2x 전송 자원 선택 방법 및 상기 방법을 이용하는 단말 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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.
- Public safety networks have higher service requirements (reliability and security) than commercial communication networks, and require direct signal transmission and reception, or D2D operation, between devices, especially when cellular coverage is not available or available. .
- 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.
- V2D communication can be extended and applied to signal transmission and reception between vehicles, and communication related to vehicle (VEHICLE) is specifically called V2X (VEHICLE-TO-EVERYTHING) communication.
- V2X VEHICLE-TO-EVERYTHING
- V2X the term 'X' may be referred to as PEDESTRIAN (COMMUNICATION BETWEEN A VEHICLE AND A DEVICE CARRIED BY AN INDIVIDUAL (e.g., HANDHELD TERMINAL CARRIED BY A PEDESTRIAN, CYCLIST, DRIVER OR PASSENGER) , VEHICLE (COMMUNICATION BETWEEN VEHICLES) (V2V), 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).
- the V2X terminal may perform V2X communication on a predefined channel (or band). In this case, only the V2X communication may not be performed in the channel (or band, etc.) in which the V2X terminal performs V2X communication. That is, communication other than V2X communication (for example, 'DSRC / IEEE 802.11P SERVICE', 'NEW RAT ( NR ) based on other NUMEROLOGY') may be performed on a channel where the V2X terminal performs V2X communication. have. Accordingly, when the V2X terminal performs V2X communication on a specific channel, a problem such as a collision between V2X communication and other communication may occur.
- V2X communication for example, 'DSRC / IEEE 802.11P SERVICE', 'NEW RAT ( NR ) based on other NUMEROLOGY'
- 'V2X communication' and 'other communication suggests how to coexist efficiently.
- ' DSRC / IEEE 802.11P SERVICE ',' (based on other NUMEROLOGY) NEW RAT 'on the same channel (/ band) previously defined (/ signaled) ( NR ) eV2X SERVICE ')' suggests how to coexist efficiently.
- 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.
- a V2X operation method performed by a vehicle-to-X (V2X) terminal in a wireless communication system it is determined whether other communication is performed on a V2X resource on which V2X communication is performed, and Based on the determination, while performing the V2X communication, while determining whether another communication is performed on the V2X resources on which the V2X communication is performed, the terminal skips the transmission operation for the V2X communication, characterized in that Provide a method.
- the terminal may stop the V2X communication for a preset time on the V2X resource or perform the V2X communication on another resource.
- the terminal may transmit information indicating whether other communication is performed to the base station.
- the terminal may receive from the base station information indicating to stop the V2X communication for a predetermined time on the V2X resource, or information indicating to perform the V2X communication on the other resource.
- the terminal may perform the V2X communication on another resource arbitrarily determined or the V2X communication on another resource determined based on sensing.
- another resource determined based on the sensing may be a resource determined through partial sensing.
- the terminal when the V2X communication is stopped for a predetermined time on the V2X resource, the terminal re-determines whether or not other communication is performed on the V2X resource, and when the other communication is not performed on the V2X resource as a result of the re-determination.
- the terminal may re-perform the V2X communication on the V2X resource.
- the other communication may be communication based on IEEE 802.11P.
- V2X vehicle-to-X
- the other channel may be a channel with relatively low congestion, a channel with a relatively low resource occupied by another V2X terminal, or a channel for which no other communication is detected.
- the terminal may perform V2X communication on the other channel.
- the terminal when the V2X communication is performed on the other channel, the terminal performs the V2X communication on a randomly determined resource on the other channel, or performs the V2X communication on another resource determined based on sensing on the other channel. Can be done.
- the resource determined based on the sensing may be a resource determined through partial sensing.
- 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, Determining whether other communication is performed on a V2X resource on which V2X communication is performed, and performing the V2X communication based on the determination, and determining whether other communication is performed on a V2X resource on which the V2X communication is performed.
- the terminal can provide a terminal, characterized in that the transmission operation for the V2X communication is omitted.
- 'V2X communication' and 'other communication for example,' DSRC / IEEE 802.11P SERVICE ',' (other NUMEROLOGY-based) on the same channel (/ band) previously defined (/ signaled) New RAT (NR) eV2X SERVICE ')' provides a way to coexist efficiently. Accordingly, it is possible to effectively achieve 'FAIRNESS' for 'channel (/ band) utilization (/ occupancy)' between different communications. Furthermore, according to the present invention, a method for determining a resource on which V2X communication is performed in consideration of congestion on a V2X resource is provided. Accordingly, the terminal according to the present invention efficiently determines the resources to be performed V2X communication, thereby providing optimization of the wireless communication system.
- 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 of a method in which V2X communication and other communication coexist according to an embodiment of the present invention.
- V2X transmission resource (re) selection (/ reservation) method illustrates a V2X transmission resource (re) selection (/ reservation) method according to a partial sensing operation according to [suggestion method # 3].
- 10 is an example of an LTE SL V2V detection signal using a short sequence of time repetition.
- 11 is an example of an LTE SL V2V detection signal using sequence matching in the frequency domain.
- FIG. 12 is a flowchart of a method in which V2X communication and other communication coexist according to another embodiment of the present invention.
- FIG. 13 is a flowchart of a method in which V2X communication and other communication coexist according to another embodiment of the present invention.
- FIG. 14 is a flowchart of a method of determining a resource for performing V2X communication based on a congestion degree according to an embodiment of the present invention.
- 15 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 is composed of a MAC layer, a PHY layer, and a higher layer, ProSe Protocol layer.
- the upper layer deals with the permission for the announcement and monitoring of discovery information, 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 the UE-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).
- a terminal that provides (or supports) the above-described D2D operation may be referred to as a D2D terminal, and a terminal that provides (or supports) the above-described V2X operation may be referred to as a V2X terminal.
- a terminal that provides (or supports) the above-described V2X operation may be referred to as a V2X terminal.
- embodiments of the present invention will be mainly described in terms of a V2X terminal, but the description of the corresponding V2X terminal may be applied to the D2D terminal.
- 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.
- the V2X terminal may perform V2X communication on a channel (or band) previously defined (/ signaled). In this case, as an example, only V2X communication may not exist on the corresponding channel (or band). That is, on the channel where V2X communication is performed, other communication (eg, 'DSRC / IEEE 802.11P SERVICE', 'NEW RAT ( NR ) eV2X SERVICE' (based on other NUMEROLOGY)) other than V2X communication exists (/ performed). It may be). Accordingly, when the V2X terminal performs V2X communication on a specific channel (or band), a problem such as collision with other communication may occur.
- a problem such as collision with other communication may occur.
- 'V2X communication' and 'other communication suggests how to coexist efficiently.
- 'FAIRNESS' for 'channel (/ band) utilization (/ occupancy)' between different communications.
- the term 'channel (/ band / resource)' used in the present invention may be interpreted (mutually) in the meaning of 'CARRIER (/ FREQUENCY / POOL)'.
- FIG. 8 is a flowchart of a method in which V2X communication and other communication coexist according to an embodiment of the present invention.
- the terminal may determine whether other communication is performed (/ exists) on a V2X resource on which V2X communication is performed (S810).
- the terminal may mean a V2X terminal.
- a specific example in which the terminal determines whether other communication is performed (/ exists) on a V2X resource on which V2X communication is performed will be described later.
- the terminal may perform the V2X communication based on the determination (S820). For example, when another communication is performed (/ exists) on the V2X resource, the terminal may stop the V2X communication for a preset time on the V2X resource or perform the V2X communication on another resource. Also, for example, the terminal may transmit information indicating whether other communication is performed (/ exists) to the base station. For example, the terminal may receive information indicating to stop the V2X communication for a predetermined time on the V2X resource or information indicating to perform the V2X communication on the other resource from the base station.
- the terminal when performing the V2X communication on the other resource, the terminal may perform the V2X communication on another resource arbitrarily determined or the V2X communication on another resource determined based on sensing. Also, for example, another resource determined based on the sensing may be a resource determined through partial sensing. Further, for example, when the V2X communication is interrupted for a preset time on the V2X resource, the terminal re-determines whether other communication is performed (/ exists) on the V2X resource, and as a result of the re-decision, the other on the V2X resource. If communication is not performed (/ exists), the terminal may re-execute the V2X communication on the V2X resource.
- the terminal determines whether other communication is performed (/ exists) on a V2X resource on which V2X communication is performed, and examples of performing V2X communication based on the determination will be described in more detail.
- V2X UE (S) participating in 'V2X communication' skips (V2X communication related) channel / signal transmission operation on a specific (time / frequency) resource previously defined (/ signaled).
- V2X communication related V2X communication related channel / signal transmission operation on a specific (time / frequency) resource previously defined (/ signaled).
- the (setting) related (setting) parameters (e.g., period, (time / frequency) resource location (/ length), hopping pattern, etc.) related to (corresponding) are 'CARRIER (/ POOL) -SPECIFIC'. It can be specified in the form (PRE) CONFIGURATION '.
- the V2X UE (S) is configured to 'different communication (eg,' DSRC / IEEE 802.11) within an adjacent distance (and / or the same channel (/ band)).
- P SERVICE ',' NR eV2X SERVICE '(based on other NUMEROLOGY)' can be determined.
- V2X UE (s): (A) 'V2X communication' on that channel (/ band). Rules are defined to abort (for a predefined (/ signaled) time) and / or (B) 'V2X communication' is performed according to a predefined (/ signaled) (rule (/) priority) Rules to change the 'resource (/ channel / band)' and / or to perform 'V2X communication' (for a predetermined time period (pre-signaled)) on another resource (/ channel / band) This may be defined.
- the V2X UE (S) continues to 'V2X communication (without interruption) on that channel (/ band). 'Will be performed.
- (predefined (/ signaled) (time (/ frequency))) resources e.g., 'SILENCING PERIOD'
- 'OTHER RAT' bitmaps (of preset length (/ signaled) length) related to V2X resource pool configuration from being applied.
- the (predefined (/ signaled) (time (/ frequency))) resource used for detecting 'other communication' (and / or 'OTHER RAT') is a V2X resource pool. It can also be interpreted as being excluded from the setting.
- a V2X UE may have a predefined (/ signaled) signal (/ channel) (e.g. SA (/ PSCCH) (e.g. May be defined) and / or DATA (/ PSSCH) (and / or PSBCH) (e.g. in the form of MAC CE), etc.
- SA / PSCCH
- DATA / PSSCH
- PSBCH / or PSBCH
- a rule may be defined to inform V2X UE (S) '(and / or' (serving) base station (/ RSU) ').
- 'other communication' is detected when its location information (and / or '(location-based resource pool (TDM (/ FDM)) partitioning operation is set (/ signaling)) is detected.
- Resource pool (/ carrier / channel / band) (index) information ') may be included.
- a (serving) base station (/ RSU) that has received this information is a V2X UE (S) (eg, on a (reported) adjacent (or same) location (/ area)) (eg, 'P-UE').
- S) ' may inform the corresponding information (for example, via a predefined signal (for example, (WAN) DL (/ PDSCH))).
- the (serving) base station (/ RSU) receiving the information (from the V-UE (S)) is a (adjacent or identical) location (/ area) (and / or pool) where 'other communication' was detected.
- 'ACTIVATION / DEACTIVATION' the resource pool (related) to the V2X UE (S) (e.g. 'P-UE (S)') on (/ carrier / channel / band) and / or 'V2X communication' Interrupting (and / or 'V2X MESSAGE TX Operation') and / or switching to another carrier (/ channel / band / full) that has been pre-set (/ signaled) To dictate.
- the V2X UE (S) (eg, 'P-UE (S)') that has received the corresponding information (from the (serving) base station (/ RSU)) has its (current) location ( And / or consider / compare the pool (/ carrier / channel / band) on which the (current) V2X MESSAGE TX operation is performed to maintain the V2X MESSAGE TX operation on the existing pool (/ carrier / channel / band) ( Switching to another carrier (/ channel / band / pool) and / or other resources (/ channel /) as defined (/ signaled) (depending on the rule (/ (priority) order)) It is possible to determine (/ determin) whether or not to perform 'V2X communication' (and / or 'V2X MESSAGE TX operation') on a band (for a predetermined time (pre-signaled)).
- the rule is defined such that the reporting (/ signaling) operation of the corresponding information (of V2X UE (S)) is performed only when the 'measurement' value is higher than a predefined (/ signaling) threshold.
- the (serving) base station (RSU) that has received (or received) detection information of 'other communication' from the V2X UE (S) is (A) a 'CARRIER ( / Channel (/ band)) '(in accordance with the predefined (/ signaled) rules (/ (priority) order)) and / or (B) to change to' UU-based V2X communication '.
- the V2X UE S which has received the detection information of 'other communication' from the (adjacent) neighboring V2X UE S, (as well) has a predefined (/ signaled) rule (/ (priority) rank) in advance. Change the 'channel (/ band / CARRIER)' in which 'V2X communication' is performed and / or set 'V2X communication' on the corresponding channel (/ band / CARRIER) (during the pre-defined (/ signaled) time).
- a V2X UE (eg, P-UE (S)) causes a (serving) base station (/ RSU) (and / or (other) V2X UE (S)) to (re) transmit ( 'WAKE-UP' and 'WAKE-UP' according to a predefined (/ signaled) period (/ pattern) for the efficient reception of the ('other communication' detection) information. / Or 'receive the corresponding channel (/ signal) attempt to receive' may be performed.
- a V2X UE (eg, P-UE (S)) transfers a resource (or its own transmission operation (timepoint)) that it has selected (/ reserved) for V2X MESSAGE TX use.
- the nearest (or prior to the (timed / timing) offset value previously set (/ signaled) from the resource selected (/ reserved) for the purpose of the V2X MESSAGE TX (or your own send operation (time)).
- the V2X UE may cause the 'LTE SIGNAL (/ signaled)' (pre-set (/ signaled)) on a specific (time / frequency) resource previously defined (/ signaled).
- CHANNEL ' is not detected and (meaning) the' measurement 'value is higher than the predefined (/ signaling) threshold, the' other communication 'within adjacent distances (and / or the same channel (/ band)).
- 'DSRC / IEEE 802.11P SERVICE', 'NR eV2X SERVICE' (based on other NUMEROLOGY)) may be defined to determine that is being performed.
- a (serving) base station (/ RSU) (and / or (other) V2X UE (S)) that has received 'other communication' detection (whether) information from a particular V2X UE (S) may (in coverage or connection).
- a nearby (other) V2X UE (S) e.g., 'P-UE (S)'
- a base station (/ RSU) that has a predefined channel (/ signal). You can also tell me.
- this information is predefined (/ reported) 'location (/ identifier) information of a specific V2X UE (S)' (and / or '(location based resource pool (TDM (/ FDM))).
- S V2X UE
- TDM resource pool
- additional information such as resource pool (/ carrier / channel / band) (index) information and / or '(energy) measurement information') where 'different communication' is detected. May be sent.
- 'V2X communication' on the existing channel (/ band) interrupted 'V2X communication' (and / or other resources (/ channel / band)) for a predefined time (/ signaling time).
- V2X UE (s) that performed ' perform' (energy) measurement 'operation again on a specific (time / frequency) resource (on an existing channel (/ band)) previously defined (/ signaled)
- a rule may be defined to re-perform 'V2X communication' (in an existing channel (/ band)).
- the 'V2X communication' re-execution on the existing channel (/ band) may be performed when (A) 'other communication' is not detected (as a result of the 'measurement' operation) and / or (B) in advance. If the backoff (/ counter) value defined (/ signaled) at is less than or equal to '0' (or selected (/ drawn) random (real)) value ('X' in the range '0 ⁇ X ⁇ 1') The rule may be defined so that)) is performed only when () is less than or equal to a predefined (/ signaled) probability value.
- the backoff value is defined by a predefined (/ signaled) value (for example, '1') whenever 'other communication' is not detected (when performing 'measurement' operation). Can be reduced.
- the 'measurement' behavior for detecting 'other communications (e.g.' DSRC / IEEE 802.11P SERVICE ',' NR eV2X SERVICE '(based on other NUMEROLOGY)) is (at least predefined)
- the V2X UE (S) (located within the / signaled distance) needs to perform at the same time. If not, for example, the 'V2X communication' may be excessively interrupted by mistaken 'V2X communication' (performed within adjacent distance (and / or on the same channel (/ band))) as 'other communication'. have.
- (time / frequency) resource related information (e.g., period, subframe offset, (hopping) pattern, etc.) on which the 'measurement' operation is performed is not ('LOCAL TIME') Rule defined to be set (/ signaled) and applied based on GPS (GLOBAL POSITIONING SYSTEM) TIME (or UTC (COORDINATED UNIVERSAL TIME)) (or 'Time (synchronous) of (serving) base station (/ RSU)') Can be.
- GPS GLOBAL POSITIONING SYSTEM
- UTC COORDINATED UNIVERSAL TIME
- the (time / frequency) resource related information in which the 'measurement' operation is performed may include 'V2X MESSAGE TYPE (for example,' PERIODIC 'or' EVENT-TRIGGERD 'V2X MESSAGE) and / or' V2X '.
- MESSAGE PRIORITY 'and / or' V2X UE DENSITY (/ SPEED) 'and / or' V2X MESSAGE PRIORITY 'and / or' V2X UE TYPE ' may be considered (differently or independently).
- the 'measurement' operation may be performed (directly) by the (serving) base station (/ RSU) (as well as the V2X UE (S)).
- the (serving) base station (/ RSU) as well as the V2X UE (S)).
- 'other communication e.g.,' DSRC / IEEE 802.11P SERVICE ',' (other NUMEROLOGY based) NR eV2X SERVICE '
- the (serving) base station (/ RSU) that detects a 'V2X' (on the corresponding channel (/ band)) to the surrounding V2X UE (S) (and / or base station (/ RSU)) (in coverage or with a connection).
- 'CROSS CARRIER (/ POOL) SCHEDULING' is performed for various purposes / reasons (for example, CONGESTION COTROL) (e.g., performed in a CARRIER (/ POOL) with different SA transmission and DATA transmission, DATA (/ SA)
- CONGESTION COTROL e.g., performed in a CARRIER (/ POOL) with different SA transmission and DATA transmission, DATA (/ SA)
- CONGESTION COTROL e.g., performed in a CARRIER (/ POOL) with different SA transmission and DATA transmission, DATA (/ SA)
- PHY FORMAT may be different.
- V2X UE on a channel (e.g., PSCCH) previously defined (/ signaled) to which PHY FORMAT (e.g., 'RS STRUCTURE') the V2X UE will transmit on a particular CARRIER (e.g., 'RS STRUCTURE'). You can also inform (via other) V2X UE (S) via the (new) field.
- PHY FORMAT e.g., 'RS STRUCTURE'
- CARRIER e.g., 'RS STRUCTURE'
- the PHY FORMAT of a channel (eg, PSCCH) used for transmission of 'scheduling / control information (and / or PHY FORMAT information used)' is the same (or in common) among different CARRIER (/ POOL). May be defined.
- V2X UE (S) may be to perform the (transmission) resource (re) selection as follows.
- Table 1 shows an example of the (trans) resource (re) selection operation, 2.
- Table 2 shows an example of the transmission resource (re) reservation (/ selection) operation of the V2X TX UE (S) The contents are explained in Table 2.
- the proposed methods below allow the V2X UE (S) to follow other rules (e.g., 'DSRC / IEEE 802.11P SERVICE', '(other NUMEROLOGY based) on a specific channel (/ band / carrier) according to the rules (described above). ))
- rules e.g., 'DSRC / IEEE 802.11P SERVICE', '(other NUMEROLOGY based
- NR eV2X SERVICE ' is detected and' channel (/ band / carrier) switching (/ change) operation 'is performed,' sensing operation 'and / or' resource (re) selection operation 'related to V2X communication
- NR eV2X SERVICE ' is detected and' channel (/ band / carrier) switching (/ change) operation 'is performed,' sensing operation 'and / or' resource (re) selection operation 'related to V2X communication
- switching (/ change) operation ' switching (/ change) operation 'is performed,' sensing operation
- the wording of "sensing” may be a pre-defined (/ signaled) reference signal (REFERENCE SIGNAL ( RS )) and / or an energy measurement operation for the channel (e.g. (in conjunction with the decoded PSCCH)). It may be interpreted as a DM-RS RSRP and / or S-RSSI) of the PSSCH or a decoding operation for a channel (eg, PSCCH (PHYSICAL SIDELINK CONTROL CHANNEL)) previously defined (/ signaled).
- PSCCH PHYSICAL SIDELINK CONTROL CHANNEL
- these (some) proposed methods are defined in advance because the 'CONGESTION LEVEL' of the particular channel (/ band / carrier) on which V2X communication is being performed is higher (than the pre-set (/ signaled) threshold).
- the V2X UE (S) may perform a 'channel (/ band / carrier) switching (/ change) operation'. It can also be extended.
- 'channel (/ band / carrier) switching (/ change) operation' may be interpreted as a condition that triggers (/ perform) a kind of (transmission) resource (re) selection.
- the resources randomly (re) selected according to the rule are (the number of times the signal is preset (/ signaled) after the 'channel (/ band / carrier) switching (/ change) operation' is performed (for example, ' 1 ') is used only for' TB (TRANSPORT BLOCK) 'transfers) (for future (multiple)' TB 'transfers) or' reserved '(/' SPS (SEMI-PERSISTENT SCHEDULING) ') or future It can also be used to prevent (reserved) the (frequency) resources used for (multiple) 'TB' transmissions.
- randomly (re) selected resources are (exceptionally) ((plural (or pre-set (/ signaling))) Number of times)) to allow for 'scheduled' (/ 'SPS'), or for future 'TB' transfers (multiple (or preset (/ signaled))) It can also be used (/ reserved) as a (frequency) resource.
- the V2X UE S may perform (sensingly) perform a 'sensing' operation during a pre-set (/ signaled) time interval on a switched (/ changed) channel (/ band / carrier). Then, based on the result, it may be possible to (re) select the (optimal) resources to be used for V2X communication.
- the corresponding 'sensing time interval' value (and / or the “PSSCH-RSRP MEASUREMENT” threshold on STEP 5 of Table 2 SECTION 2.3. And / or “on Table 2 SECTION 2.3. STEP 6 (/ 8)”).
- M total "Related count (ratio) values e.g., the minimum number of (candidate) resources that must remain (in the set of S A ) (during total (candidate) resources) after STEP 5 of SECTION 2.3.
- the period value used in STEP 8 of SECTION 2.3. Is applied (/ used) when the channel (/ band / carrier) switching (/ change) operation is not performed. May be set (/ signaled) differently (e.g., a relatively small (or larger) value) (or the same) from (e.g., '1000MS').
- C resel value for example, "[10 * SL_RESOURCE_RESELECTION_COUNTER]" and / or V2X message priority and / or V2X resource pool (and / or (V2X) carrier) selectable (/ allowable) I_VALUE (range) Value and / or P_STEP value and / or transmission power-related (OPEN-LOOP) parameters (/ values) (eg "P O ", "ALPHA”, etc.) are changed to 'channel (/ band / carrier) switching (/ change). May be set (/ signaled) differently (or the same) from being applied (/ used) when the 'operation' is not performed.
- Example # 3-1 'Channel (/ Band / Carrier) Switching (/ Change)', but if (transmitted or created) on '(LOW LAYER) Buffer' (and / or 'PDCP LAYER') If there are no packets (/ messages) (or no packets (/ messages) are generated), the V2X UE (s) will be sent to the 'V2X RESOURCE POOL' on the switched channel (/ band / carrier). It may also be possible to (partially) perform a 'sensing' operation.
- the '(partial) sensing' operation may have a packet (/ message) (/ delivered) (/ reached) on its (LOW LAYER) buffer '(and / or' PDCP LAYER '). ), Or until a packet (/ message) is generated (or only during a pre-set (/ signaled) time interval).
- the V2X UE S
- the V2X UE finally performs 'V2X RESOURCE POOL' on (switched (/ changed) channel (/ band / carrier)) based on the result of '(partial) sensing' operation.
- (Re) selects the most appropriate (transmission) resource.
- the V2X UE (S) may be able to (re) select (re) selecting its (transmission) resource only (limitedly) within the resource (area) where the 'partial sensing' operation is performed.
- it may be defined to 'reserve' (/ 'SPS') (frequency) resources (related to (multiple) 'TB' transmissions) only when '(partial) sensing' operation is performed. .
- V2X UE S It is also possible to (partially) perform a 'sensing' operation on a 'V2X RESOURCE POOL' on a switched channel (/ band / carrier).
- Example # 3-2 (In (Example # 3-1) above), the V2X UE S according to whether or not a condition set in advance (/ signaling) is satisfied, (A) '(partial) sensing' It may be able to perform (/ select) one of operation-based resource (re) selection and (B) 'random' based resource (re) selection.
- resource related '(re) selected in' V2X RESOURCE POOL 'on existing channel (/ band / carrier) (RESELCTION) COUNTER 'value is less than or equal to (or greater than) a pre-set (/ signaled) threshold (e.g.' 0 ') (and / or (your)) is set (/ signaling) in advance
- a pre-set (/ signaled) threshold e.g.' 0 ') (and / or (your)
- Example # 3-3 When the V2X UE (S) performs 'channel (/ band / carrier) switching (/ change)', the 'V2X RESOURCE POOL' on the existing channel (/ band / carrier) If the selected resource-related '(RESELCTION) COUNTER' value is greater than (or less than or equal to) a preset (/ signaled) threshold (e.g.
- the rule is limitedly applied only when the existing channel (/ band / carrier) and the 'RESOURCE POOL CONFIGURATION (/ BANDWIDTH)' related to V2X communication on the switched channel (/ band / carrier) are the same. Can also be.
- the V2X UE (S) is the 'channel (/ band / carrier) switching (/ change)' and the ((/ change) V2X communication related (transmission) resource location on the switched (/ band / carrier) existing
- the sensing result on the channel (/ band / carrier) is set using (re), between the existing channel (/ band / carrier) and the switched (/ changed) channel (/ band / carrier) (on the logical resource area)
- the V2X UE (S), 'channel (/ band / carrier) switching (/ change)' and ((/ change) 'V2X communication related (transmission) resource location on the switched channel (/ band / carrier) If (Re) is used to set the sensing result on the existing channel (/ band / carrier), it is possible to set the (transmission) by using (Re) the sensing result on the existing channel (/ band / carrier).
- V2X MESSSAGE Resource location occupied by (already) another V2X UE (s) on a switched channel (/ band / carrier) (e.g., channel where the V2X UE (s) is switched (/ changed) ( / Band / carrier), which can be interpreted as a case where (A) is performed beforehand (A) reselecting (and / or randomly selecting) the corresponding (transmitted) resource and / or (B) Only the remaining non-conflicting (transporting) resources can be used for (V2X MESSSAGE) transmission purposes.
- a switched channel e.g., channel where the V2X UE (s) is switched (/ changed) ( / Band / carrier
- V2X transmission resource (re) selection (/ reservation) method illustrates a V2X transmission resource (re) selection (/ reservation) method according to the (partial) sensing operation according to [suggestion method # 3].
- 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 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.
- a V2X UE (s) (with multiple channel (/ band / carrier) related reception (/ sensing) capability) may be configured to sense (/ receive) multiple channels (/ band / carrier). And / or perform other communications (e.g., 'DSRC / IEEE 802.11P SERVICE', 'NR eV2X SERVICE' (based on other NUMEROLOGY)) and are currently transmitting (V2X) messages. If other communication is detected on the channel (/ band / carrier) that performs the operation, the sensing (/ receive) operation (and / or other communication detection operation) is performed (except the corresponding channel (/ band / carrier)). One of a plurality of channels (/ band / carrier) may be selected to perform a channel (/ band / carrier) switching (/ change) operation.
- (A) CONGESTION LEVEL (and / or sensed energy measurement) is (relatively) low among channels (/ band / carrier) and / or ( B) a channel (/ band / carrier) that has (relatively) less resources occupied by other V2X UE (S) and / or (C) a channel (/ band / carrier) for which no other communication has been detected and / or (E ) Selects (relatively) low (or high) indexed channels (/ bands / carriers) preferentially (and / or (high (or low) (priority) according to a preset (priority) priority)
- the channel (/ band / carrier) of the priority) may be preferentially selected or randomly selected.
- the V2X UE (S) uses a specific carrier (/ channel (/ band)) (pre-set (/ signaled)) for (V2X MESSAGE) transmission and then (pre-set (/ signaled))
- a specific carrier / channel (/ band)
- pre-set (/ signaled) for (V2X MESSAGE) transmission and then (pre-set (/ signaled))
- another carrier / channel (/ band)
- Switching may cause system instability.
- a timer for maintaining (V2X MESSAGE) transmission on (/ channel (/ band)) is set (/ signaled) and / or (B) a different carrier (/ channel (/ Bands)) and / or a threshold (for example, 'CONGESTION LEVEL' (and / or 'LOAD LEVEL') Relevant) switching action to another carrier (/ channel (/ band)) (only of relatively low 'CONGESTION LEVEL' (and / or 'LOAD LEVEL')) is exceeded when it can be interpreted as 'HYSTERESIS'. Limited).
- V2X the 'RAT' of the UE (S) a (relatively) set at a lower priority (/ signaling) the resources (RES_L) and (relatively) the set to high priority (/ signaling) resources (RES_H) Suppose you have this (see Table 3).
- the V2X UE (S) performs V2X communication on 'RES_H' and then the threshold ( CL_RSC_H ) (/ measured) that the (measured) 'CONGESTION LEVEL' value is previously set (/ signaled) ( For example, when 'CL_RSC_H' is larger than the threshold associated with 'RES_H', considering the switching (/ offloading) to 'RES_L', the 'RES_L' related (measured) 'CONGESTION LEVEL' value (Actual) ('RES_H' to 'RES_H' only when smaller than this preset (/ signaled) threshold ( CL_RSC_L ) (for example, 'CL_RSC_L' can be viewed as the threshold associated with 'RES_L') Switching may be allowed.
- 'CL_RSC_H' and 'CL_RSC_L' may be set (/ signaled) to different values (eg, 'CL_
- a V2X UE may be configured to operate on a (external) resource region (preconfigured / signaled) that is not a V2X resource pool (specified in the form 'CARRIER (/ CELL) -SPEICIFC NETWORK (PRE) CONFIGURATION').
- 'CONGESTION LEVEL' and / or 'LOAD LEVEL'
- And / or 'OTHER RAT' detection operation).
- the corresponding 'CONGESTION LEVEL' (and / or 'LOAD LEVEL') measurement (and / or 'other communication' (and / or 'OTHER RAT') detection for that ((external) resource zone) is a dictionary. It may be performed in (separate) subchannels (on (external) resource zones) set in (/ signaling) and / or in all bands (on (external) resource zones).
- the (S-RSSI) measurement operation (related to the 'CONGESTION LEVEL' (and / or 'LOAD LEVEL') measurement) may be performed in the V2X resource (s) without distinguishing the V2X resource pool.
- the corresponding ('CONGESTION LEVEL' (and / or 'LOAD LEVEL') measurement) (S-RSSI) measurement operation is of the form ((V2X) POOL-SPECIFIC '(or' (V2X) POOL-COMMON). It is also possible to measure the area other than (V2X) POOL separately.
- the measurement operation in the V2X resource (s)
- the measurement operation may be performed only at the (V2X) TX POOL (and / or (V2X) RX POOL).
- a V2X TX UE (S) is configured (in accordance with a pre-set (/ signaled) rule (/ (priority) order)) (relative to 'V2X communication' (and / or 'V2X MESSAGE TX operation')).
- a pre-set (/ signaled) rule (/ (priority) order)
- the channel eg 'PSCCH (/ PSSCH)' and / or ' PSBCH) '
- the (specific) carrier (/ channel / band / full) to which a channel of a corresponding purpose is transmitted may be set (/ signaled) in advance (in a 'UE-COMMON' form).
- Table 3 shows how 'V2X communication' and 'other communication (e.g.,' DSRC / IEEE 802.11P SERVICE ',' NR eV2X SERVICE '(based on other NUMEROLOGY)) coexist efficiently. .
- 'V2X communication' and 'other communication e.g.,' DSRC / IEEE 802.11P SERVICE ',' NR eV2X SERVICE '(based on other NUMEROLOGY)
- 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.
- 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 are (DEDICATED) RX (/ TX) for V-UE (S) (or P-UE (S)) (and / or V2X carrier (/ channel (/ band)).
- the (some) proposed schemes of the present invention may be defined in advance among a plurality of (preset (/ signaled)) (send (/ receive)) (candidate) carriers (/ resource pools).
- preset e.g. CHANNEL BUSY RATIO ( CBR ), etc.
- CBR CHANNEL BUSY RATIO
- (partly) specific (sent (/ received)) carrier / resource pool) (used for (actual) V2X message transmission (/ receive))
- FIG. 12 is a flowchart of a method in which V2X communication and other communication coexist according to another embodiment of the present invention.
- the terminal may determine whether other communication is performed (/ exists) on a V2X resource on which V2X communication is performed (S1210).
- the terminal may determine whether other communication is performed (/ exists) on the V2X resource through energy sensing, and more specifically, if the energy sensing value exceeds the threshold, the terminal may determine the V2X resource. It can be determined that other communication is performed (/ exists) on the network. Since a specific example of determining whether or not the other communication is performed (/ exists) on the V2X resource is as described above, a detailed description thereof will be omitted.
- the terminal may transmit information on whether other communication is performed (/ exists) to the base station or other V2X terminal (s) (S1220). In this case, the terminal may transmit the information to the base station or another terminal may be selectively performed. In this case, the V2X UE (S), for example, through a signal (/ channel) predefined (/ signaled) In addition, a rule may be defined to inform its surrounding 'V2X UE (S)' (and / or '(serving) base station (/ RSU)') of detection (or not) of 'other communication'.
- 'other communication' is detected when its location information (and / or '(location-based resource pool (TDM (/ FDM)) partitioning operation is set (/ signaling)) is detected.
- Resource pool (/ carrier / channel / band) (index) information ') may be included.
- Specific examples of the terminal transmitting the information to the base station or another terminal are the same as described above, so a detailed description thereof will be omitted below.
- the (specific) terminal may perform wake up according to a predefined cycle (S1230). In this case, the terminal performing the wake up may also determine whether other communication is performed (/ exists) on the V2X resource on which the V2X communication is performed.
- a V2X UE (S) eg, P-UE (S)
- the terminal may receive information from the base station to instruct 'ACTIVATION / DEACTIVATION', stop 'V2X communication', or switch switching to another preset carrier.
- the (serving) base station (/ RSU) receiving the information is a (adjacent or identical) location (/ area) (and / or pool) where 'other communication' was detected.
- 'ACTIVATION / DEACTIVATION' the resource pool (related) to the V2X UE (S) (e.g.
- the terminal may stop the V2X communication for a predetermined time on the V2X resource or perform the V2X communication on another resource (S1250).
- the terminal may stop the V2X communication for a predetermined time on the V2X resource or perform the V2X communication on another resource (S1250).
- the 'measurement' value is higher than a predefined (/ signaled) threshold, let the V2X UE (s): (A) 'V2X communication' on that channel (/ band).
- Rules are defined to abort (for a predefined (/ signaled) time) and / or (B) 'V2X communication' is performed according to a predefined (/ signaled) (rule (/) priority) Rules to change the 'resource (/ channel / band)' and / or to perform 'V2X communication' (for a predetermined time period (pre-signaled)) on another resource (/ channel / band) This may be defined.
- the V2X UE (S) continues to 'V2X communication (without interruption) on that channel (/ band). 'Will be performed.
- FIG. 13 is a flowchart of a method in which V2X communication and other communication coexist according to another embodiment of the present invention.
- the terminal may determine whether another communication is performed (/ detected) on a V2X resource on which V2X communication is performed (S1310). Since a specific example of determining whether or not the UE performs other communication on / over a V2X resource is as described above, a detailed description thereof will be omitted.
- the terminal may transmit information on whether other communication is performed (/ detected) to the base station or other V2X terminal (s) (S1320). Specific examples of the terminal transmitting the information to the base station or another terminal are the same as described above, so a detailed description thereof will be omitted below.
- the (specific) terminal may allow the user to perform a wake up according to a predefined cycle (S1330).
- a predefined cycle S1330
- the terminal may receive, from the base station, information indicating switching to another preset carrier (S1340).
- information indicating switching to another preset carrier S1340
- the terminal may receive, from the base station, information indicating switching to another preset carrier (S1340).
- the terminal may perform the V2X communication on another resource determined randomly (after carrier switching), or perform the V2X communication on another resource determined based on (partial) sensing. It may be (S1350).
- the resources to be used for V2X communication can be randomly (re) selected.
- the V2X UE S may perform (sensingly) perform a 'sensing' operation during a pre-set (/ signaled) time interval on a switched (/ changed) channel (/ band / carrier). Then, based on the result, it may be possible to (re) select the (optimal) resources to be used for V2X communication.
- resources to be used for V2X communication are determined according to the (some) rules below (switched (/ changed) channel (/ Band / carrier) in the 'V2X RESOURCE POOL').
- the UE when the other communication is performed (/ detected), the UE performs the V2X communication on another resource randomly determined (after carrier switching) or the V2X communication on another resource determined based on (partial) sensing. Since specific examples are as described above, a detailed description thereof will be omitted below.
- FIG. 14 is a flowchart of a method of determining a resource for performing V2X communication based on a congestion degree according to an embodiment of the present invention.
- the terminal determines whether the congestion degree on a V2X resource on which V2X communication is performed is higher than a threshold value (S1410).
- a threshold value S1410
- the 'CONGESTION LEVEL' of the specific channel (/ band / carrier) on which V2X communication is being performed is higher (before the preset (/ signaled) threshold), so that a predefined rule (or ( According to the signaling (/ indicator) received from the (serving) base station (/ RSU), the V2X UE (S) may perform a 'channel (/ band / carrier) switching (/ change) operation'.
- Specific examples of the present disclosure are as described above, and thus detailed descriptions thereof will be omitted below.
- the terminal may perform V2X communication on another resource (S1420).
- the specific information on which resource the terminal selects and on which resource to perform V2X communication is as described above.
- CONGESTION LEVEL (and / or sensed energy measurement) is low (relatively) among a plurality of channels (/ band / carrier) (/ band / carrier). And / or (B) a channel (/ band / carrier) that has (relatively) less resources occupied by another V2X UE (S) and / or (C) a channel where no other communication is detected (/ band / carrier).
- / or (E) preferentially selects the channel (/ band / carrier) of the (relatively) low (or high) index (and / or according to the (priority) preset (/ signaled) priority (high (or Low (priority) channel (/ band / carrier) may be preferentially selected or randomly selected.
- the V2X UE (S) uses a specific carrier (/ channel (/ band)) (preset (/ signaled)) for (V2X MESSAGE) transmission and then (preset (/ signaling)).
- a specific carrier / channel (/ band)
- preset (/ signaled) for (V2X MESSAGE) transmission and then (preset (/ signaling)).
- the other carrier / channel (/ band)
- the system may become unstable.
- a timer for maintaining (V2X MESSAGE) transmission on (/ channel (/ band)) is set (/ signaled) and / or (B) a different carrier (/ channel (/ Bands)) and / or a threshold (for example, 'CONGESTION LEVEL' (and / or 'LOAD LEVEL') Relevant) switching action to another carrier (/ channel (/ band)) (only of relatively low 'CONGESTION LEVEL' (and / or 'LOAD LEVEL')) is exceeded when it can be interpreted as 'HYSTERESIS'. Limited).
- a V2X UE may be configured to (external) resources (preset (/ signaled)) that are not V2X resource pools (specified in the form of 'CARRIER (/ CELL) -SPEICIFC NETWORK (PRE) CONFIGURATION').
- 'CONGESTION LEVEL' and / or 'LOAD LEVEL'
- measurement behavior and / or 'other communications' (eg 'DSRC / IEEE 802.11P SERVICE', 'NR eV2X SERVICE' (based on other NUMEROLOGY)) (And / or 'OTHER RAT') detection operation).
- the corresponding 'CONGESTION LEVEL' (and / or 'LOAD LEVEL') measurement (and / or 'other communication' (and / or 'OTHER RAT') detection for that ((external) resource zone) is a dictionary.
- the (S-RSSI) measurement operation (related to the 'CONGESTION LEVEL' (and / or 'LOAD LEVEL') measurement) may be performed in the V2X resource (s) without distinguishing the V2X resource pool.
- the corresponding ('CONGESTION LEVEL' (and / or 'LOAD LEVEL') measurement) (S-RSSI) measurement operation is of the form ((V2X) POOL-SPECIFIC '(or' (V2X) POOL-COMMON).
- the measurement operation in the V2X resource (s) may be performed only at the (V2X) TX POOL (and / or (V2X) RX POOL).
- 15 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 determine whether other communication is performed on a V2X resource on which V2X communication is performed. The processor 1110 may transmit information on whether other communication is performed to the base station or the V2X terminal. The processor 1110 may receive information from the base station to instruct 'ACTIVATION / DEACTIVATION', stop 'V2X communication', or indicate switching to another preset carrier. Can be. When the other communication is performed, the processor 1110 may stop the V2X communication for a preset time on the V2X resource or perform the V2X communication on another resource.
- 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.
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Abstract
Description
Claims (14)
- 무선 통신 시스템에서 V2X(Vehicle-to-X) 단말에 의해 수행되는 V2X 동작 방법에 있어서,V2X 통신이 수행되는 V2X 자원 상에서 다른 통신이 수행되는지 여부를 결정하고; 및상기 결정에 기반하여, 상기 V2X 통신을 수행하되,상기 V2X 통신이 수행되는 V2X 자원 상에서 다른 통신이 수행되는지 여부를 결정하는 동안, 상기 단말은 상기 V2X 통신에 대한 전송 동작을 생략하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 V2X 자원 상에서 다른 통신이 수행되는 경우, 상기 단말은 상기 V2X 자원 상에서 기 설정된 시간 동안 상기 V2X 통신을 중단하거나, 또는 다른 자원 상에서 상기 V2X 통신을 수행하는 것을 특징으로 하는 방법.
- 제2항에 있어서,상기 단말은 다른 통신이 수행되는지 여부를 지시하는 정보를 기지국에게 전송하는 것을 특징으로 하는 방법.
- 제3항에 있어서,상기 단말은 상기 기지국으로부터 상기 V2X 자원 상에서 기 설정된 시간 동안 상기 V2X 통신을 중단하는 것을 지시하는 정보, 또는 상기 다른 자원 상에서 상기 V2X 통신을 수행하는 것을 지시하는 정보를 수신하는 것을 특징으로 하는 방법.
- 제2항에 있어서,상기 다른 자원 상에서 상기 V2X 통신을 수행하는 경우, 상기 단말은 임의적으로 결정된 다른 자원 상에서 상기 V2X 통신을 수행하거나, 또는 센싱에 기반하여 결정된 다른 자원 상에서 상기 V2X 통신을 수행하는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 센싱에 기반하여 결정된 다른 자원은 부분적 센싱을 통해 결정된 자원인 것을 특징으로 하는 방법.
- 제2항에 있어서,상기 V2X 자원 상에서 기 설정된 시간 동안 상기 V2X 통신을 중단하는 경우, 상기 단말은 상기 V2X 자원 상에서 다른 통신이 수행되는지 여부를 재결정하고,상기 재결정 결과 상기 V2X 자원 상에서 상기 다른 통신이 수행되지 않는 경우, 상기 단말은 상기 V2X 자원 상에서 상기 V2X 통신을 재수행하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 다른 통신은 IEEE 802.11P 기반의 통신인 것을 특징으로 하는 방법.
- 무선 통신 시스템에서 V2X(Vehicle-to-X) 단말에 의해 수행되는 V2X 동작 방법에 있어서,V2X 통신이 수행되는 V2X 채널 상에서의 혼잡도가 임계 값보다 높은지 여부를 결정하고; 및상기 V2X 채널 상에서의 혼잡도가 임계 값 보다 높은 경우, 다른 채널 상에서 V2X 통신을 수행하는 것을 특징으로 하는 방법.
- 제9항에 있어서,상기 다른 채널은 혼잡도가 상대적으로 낮은 채널이거나, 다른 V2X 단말에 의해 점유된 자원이 상대적으로 낮은 채널이거나, 혹은 다른 통신이 검출되지 않은 채널인 것을 특징으로 하는 방법.
- 제9항에 있어서,상기 단말은 상기 V2X 채널 상에서의 혼잡도와 상기 다른 채널 상에서의 혼잡도의 차이 값이 기 설정된 값 보다 큰 값일 경우, 상기 다른 채널 상에서 V2X 통신을 수행하는 것을 특징으로 하는 방법.
- 제9항에 있어서,상기 다른 채널 상에서 상기 V2X 통신을 수행하는 경우, 상기 단말은 상기 다른 채널 상의 임의적으로 결정된 자원 상에서 상기 V2X 통신을 수행하거나, 또는 상기 다른 채널 상의 센싱에 기반하여 결정된 다른 자원 상에서 상기 V2X 통신을 수행하는 것을 특징으로 하는 방법.
- 제12항에 있어서,상기 센싱에 기반하여 결정된 자원은 부분적 센싱을 통해 결정된 자원인 것을 특징으로 하는 방법.
- 단말(User equipment; UE)은,무선 신호를 송신 및 수신하는 RF(Radio Frequency) 부; 및상기 RF부와 결합하여 동작하는 프로세서; 를 포함하되, 상기 프로세서는,V2X 통신이 수행되는 V2X 자원 상에서 다른 통신이 수행되는지 여부를 결정하고, 및상기 결정에 기반하여, 상기 V2X 통신을 수행하되,상기 V2X 통신이 수행되는 V2X 자원 상에서 다른 통신이 수행되는지 여부를 결정하는 동안, 상기 단말은 상기 V2X 통신에 대한 전송 동작을 생략하는 것을 특징으로 하는 단말.
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EP3439416A1 (en) | 2019-02-06 |
KR102096505B1 (ko) | 2020-04-02 |
EP3439416A4 (en) | 2019-11-06 |
EP3439416B1 (en) | 2021-07-28 |
KR20180115326A (ko) | 2018-10-22 |
US10887736B2 (en) | 2021-01-05 |
US20190116475A1 (en) | 2019-04-18 |
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