WO2023018302A1 - 무선 통신 시스템에서 사이드링크의 단말 간 협력 방법 및 장치 - Google Patents
무선 통신 시스템에서 사이드링크의 단말 간 협력 방법 및 장치 Download PDFInfo
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Definitions
- the present invention relates to a wireless mobile communication system, and more particularly, in a process in which a vehicle terminal supporting vehicle-to-everything (V2X) communication transmits and receives information with another vehicle terminal and a pedestrian portable terminal using a side link. It relates to a method and apparatus for performing inter-UE coordination.
- V2X vehicle-to-everything
- the 5G communication system or pre-5G communication system is being called a Beyond 4G Network communication system or a Post LTE system.
- the 5G communication system is being considered for implementation in a mmWave band (eg, a 60 gigabyte (60 GHz) band).
- a mmWave band eg, a 60 gigabyte (60 GHz) band.
- beamforming, massive MIMO, and Full Dimensional MIMO are used in 5G communication systems.
- array antenna array antenna, analog beam-forming, and large scale antenna technologies are being discussed.
- cloud RAN cloud radio access network
- ultra-dense network Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation etc. are being developed.
- D2D Device to Device communication
- CoMP Coordinated Multi-Points
- advanced coding modulation Advanced Coding Modulation: ACM
- FQAM Hybrid FSK and QAM Modulation
- SWSC Simple Window Superposition Coding
- advanced access technologies FBMC (Filter Bank Multi Carrier), NOMA (non orthogonal multiple access) and SCMA (sparse code multiple access) are being developed.
- IoT Internet of Things
- M2M Machine to machine
- MTC Machine Type Communication
- the present invention relates to a wireless communication system, in which a vehicle terminal supporting V2X exchanges information with other vehicle terminals and a pedestrian portable terminal using a side link, and provides information that can be helpful between terminals through cooperation between terminals. It relates to a method and apparatus for sharing with each other. Specifically, it relates to a method for exchanging information for inter-UE coordination and a terminal operation therefor.
- a method of a first terminal of a communication system includes checking whether a 2 nd SCI is transmitted together with data in a physical sidelink shared channel (PSSCH) region; determining the number of coded modulation symbols for the 2 nd SCI based on whether the 2 nd SCI is transmitted together with data; mapping the 2 nd SCI to the PSSCH region based on the number of coded modulation symbols; Transmitting a 2 nd SCI mapped to the PSSCH region to a second terminal, and when the 2 nd SCI is not transmitted together with data, the number of coded modulation symbols for the 2 nd SCI is It may be determined that the 2 nd SCI is mapped to all PSSCH frequency resources in a symbol through which SCI is transmitted.
- PSSCH physical sidelink shared channel
- a method of a second terminal of a communication system includes checking whether a 2 nd SCI is transmitted together with data in a physical sidelink shared channel (PSSCH) region; Receiving a 2 nd SCI mapped to the PSSCH region from a first terminal based on the number of coded modulation symbols determined according to whether the 2 nd SCI is transmitted together with data, wherein the 2 nd SCI is When not transmitted with data, the number of coded modulation symbols for the 2 nd SCI may be determined such that the 2 nd SCI is mapped to all PSSCH frequency resources in the symbol in which the 2 nd SCI is transmitted.
- PSSCH physical sidelink shared channel
- a first terminal of a communication system includes a transceiver; and determining whether a 2 nd SCI is transmitted together with data in a physical sidelink shared channel (PSSCH) region, and based on whether the 2 nd SCI is transmitted together with data, the number of coded modulation symbols for the 2 nd SCI And a control unit configured to determine, map the 2 nd SCI to the PSSCH region based on the number of coded modulation symbols, and transmit the 2 nd SCI mapped to the PSSCH region to a second terminal, wherein the When the 2nd SCI is not transmitted with data, the number of coded modulation symbols for the 2nd SCI may be determined such that the 2nd SCI is mapped to all PSSCH frequency resources in the symbol in which the 2nd SCI is transmitted.
- PSSCH physical sidelink shared channel
- a second terminal of a communication system includes a transceiver; and determining whether a 2 nd SCI is transmitted together with data in a physical sidelink shared channel (PSSCH) domain, and based on the number of coded modulation symbols determined according to whether the 2 nd SCI is transmitted together with data, the PSSCH and a control unit configured to receive a 2 nd SCI mapped to a region from a first terminal, and when the 2 nd SCI is not transmitted along with data, the number of coded modulation symbols for the 2 nd SCI is It may be determined that the 2 nd SCI is mapped to all PSSCH frequency resources in a symbol through which SCI is transmitted.
- PSSCH physical sidelink shared channel
- the present invention is to propose an inter-UE coordination method in sidelink communication and a procedure for sharing information that can be helpful between terminals through this.
- the proposed method can prevent an increase in delay time occurring in sharing the corresponding information.
- FIG. 1 is a diagram showing a system according to an embodiment of the present disclosure.
- FIG. 2 is a diagram illustrating a V2X communication method through a sidelink according to an embodiment of the present disclosure.
- FIG. 3 is a diagram for explaining a resource pool defined as a set of resources on time and frequency used for sidelink transmission and reception according to an embodiment of the present disclosure.
- FIG. 4 is a diagram illustrating a method of allocating transmission resources in a sidelink by a base station according to an embodiment of the present disclosure.
- FIG. 5 is a diagram illustrating a method of directly allocating transmission resources of a sidelink through sensing in a sidelink according to an embodiment of the present disclosure.
- FIG. 6 is a diagram illustrating a mapping structure of sidelink physical channels mapped to one slot according to an embodiment of the present disclosure.
- FIG. 7 is a diagram illustrating a scenario of performing inter-UE coordination according to an embodiment of the present disclosure.
- FIG. 8 is a diagram for explaining an operation of requesting coordination information between terminals and transmitting the corresponding information through 2 nd SCI according to an embodiment of the present disclosure.
- 9 is a diagram for explaining methods for solving a power imbalance problem when control information is not transmitted along with data when transmitting control information through 2 nd SCI according to an embodiment of the present disclosure.
- 10 is a diagram for explaining methods for solving a power imbalance problem when control information is not transmitted along with data when transmitting control information through 2 nd SCI according to an embodiment of the present disclosure.
- FIG. 11 is a diagram illustrating terminal operations when control information is transmitted together with data and when control information is not transmitted through 2nd SCI.
- FIG. 12 is a block diagram illustrating the internal structure of a terminal according to an embodiment of the present invention.
- FIG. 13 is a block diagram showing the internal structure of a base station according to an embodiment of the present invention.
- FIG. 14 is a diagram showing an example of a V2X system according to an embodiment of the present disclosure.
- 15 is a diagram illustrating an example of a V2X communication method performed through a sidelink according to an embodiment of the present disclosure.
- 16 is a diagram illustrating an example of a resource pool defined as a set of resources on time and frequency used for sidelink transmission and reception according to an embodiment of the present disclosure.
- 17 is a diagram illustrating an example of a method of allocating transmission resources in a sidelink by a base station according to an embodiment of the present disclosure.
- FIG. 18 is a diagram illustrating an example of a method of directly allocating transmission resources of a sidelink through sensing in a sidelink according to an embodiment of the present disclosure.
- 19A is a diagram illustrating a mapping structure of sidelink physical channels mapped to one slot according to an embodiment of the present disclosure.
- 19B is a diagram illustrating an example of an operation of a UE that differently operates a 2nd SCI mapping method according to a case where control information is transmitted along with data and a case where control information is not transmitted through a 2nd SCI according to an embodiment of the present disclosure. .
- FIG. 20A is a diagram illustrating an example of a case in which UE-A transmitting cooperation information between UEs corresponds to a terminal receiving data for UE-B receiving cooperation information between UEs.
- FIG. 20B is a diagram illustrating an example in which any UE can become a UE-A that transmits cooperation information between UEs.
- 21 is a diagram illustrating an example of a method in which a terminal requests cooperation information between terminals to another terminal through a 2nd SCI or a terminal receiving the same transmits the requested information according to an embodiment of the present disclosure.
- 22 is a block diagram illustrating the internal structure of a terminal according to an embodiment of the present invention.
- 23 is a block diagram showing the internal structure of a base station according to an embodiment of the present invention.
- each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions.
- These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates means to perform functions.
- These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory
- the instructions stored in are also capable of producing an article of manufacture containing instruction means that perform the functions described in the flowchart block(s).
- the computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).
- each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is possible for the functions mentioned in the blocks to occur out of order. For example, two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in reverse order depending on their function.
- ' ⁇ unit' used in this embodiment means software or a hardware component such as FPGA or ASIC, and ' ⁇ unit' performs certain roles.
- ' ⁇ part' is not limited to software or hardware.
- ' ⁇ bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, ' ⁇ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
- components and ' ⁇ units' may be combined into smaller numbers of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
- components and ' ⁇ units' may be implemented to play one or more CPUs in a device or a secure multimedia card.
- ' ⁇ unit' may include one or more processors.
- the radio access network New RAN on the 5G mobile communication standard disclosed by the 3rd generation partnership project long term evolution (3GPP), a mobile communication standardization organization, and the packet core (a core network) 5G System, or 5G Core Network, or NG Core: next generation core) as the main target, but the main point of the present disclosure is to other communication systems having a similar technical background to the extent that it does not greatly depart from the scope of the present disclosure. It can be applied with slight modifications, which will be possible with the judgment of those skilled in the art of the present disclosure.
- NWDAF network data collection and analysis function
- NWDAF can collect/store/analyze information from the 5G network and provide the result to an unspecified network function (NF), and the analysis result can be used independently in each NF.
- NF network function
- 3GPP standards 5G, NR, LTE, or similar system standards
- 3GPP standards 5G, NR, LTE, or similar system standards
- present disclosure is not limited by terms and names, and may be equally applied to systems conforming to other standards.
- the 5G communication system is designed to enable resources in a mmWave band (eg, a 28 GHz frequency band).
- a mmWave band eg, a 28 GHz frequency band.
- beamforming, massive MIMO, and Full Dimensional MIMO are used in 5G communication systems.
- array antenna, analog beam-forming, and large scale antenna technologies are being discussed.
- the 5G communication system volunteers various subcarrier spacings such as 30 kHz, 60 kHz, and 120 kHz, including 15 kHz, and uses Polar Coding for the physical control channel.
- the data channel Physical Data Channel
- LDPC Low Density Parity Check
- DFT-S-OFDM Downlink Packet Control
- CP-OFDM Downlink Packet Control Protocol
- HARQ Hybrid ARQ
- 5G may additionally volunteer HARQ retransmission based on Code Block Group (CBG) in which several Code Blocks (CBs) are bundled.
- CBG Code Block Group
- CBs Code Blocks
- an evolved small cell in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network , Device to Device communication (D2D), wireless backhaul, vehicle communication network (V2X (Vehicle to Everything) network), cooperative communication, CoMP (Coordinated Multi-Points), and reception Technology development such as interference cancellation is being made.
- D2D Device to Device communication
- V2X Vehicle to Everything
- CoMP Coordinatd Multi-Points
- reception Technology development such as interference cancellation is being made.
- IoT Internet of Things
- M2M Machine to machine
- MTC Machine Type Communication
- 5G communication system technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies.
- M2M machine to machine
- MTC machine type communication
- the application of the cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 5G technology and IoT technology.
- cloud RAN cloud radio access network
- a plurality of services can be provided to users in a communication system, and in order to provide such a plurality of services to users, a method capable of providing each service within the same time period according to characteristics and a device using the same are required. .
- NR V2X unlike LTE V2X, which aims to transmit and receive basic safety information required for vehicle road driving, is group driving (platooning), advanced driving (Advanced Driving), extended sensor (Extended Sensor), remote driving (Remote Driving) and We aim to provide more advanced services together.
- inter-UE coordination may be considered in sidelink.
- cooperation between terminals may mean providing a more improved sidelink service by sharing helpful information between terminals.
- information shared for cooperation between terminals is not limited to specific information.
- resource allocation information may be included as such information.
- 2nd Sidelink Control Information SCI
- PSSCH Physical Sidelink Shared Channel
- a method of transmitting along with data information was considered.
- cooperation information is shared between terminals in the sidelink, there may be a case where there is no data to be transmitted from a terminal providing it to a terminal receiving it.
- the 2nd SCI when transmitting the 2nd SCI, a case in which data information is not transmitted is considered.
- the 2nd SCI can be mapped and transmitted only in a part of the frequency domain of the PSSCH region in the last symbol in which the 2nd SCI is transmitted.
- a power imbalance issue may occur if the 2nd SCI is mapped only to a part of the frequency domain of the PSSCH region in the last symbol in which the 2nd SCI is transmitted. there is.
- the present invention proposes various 2nd SCI mapping methods and a method for calculating the number of bits or symbols in which the 2nd SCI is coded using channel coding.
- cooperation information between terminals can be transmitted through 2nd SCI regardless of whether the terminal has data to be transmitted, and thus the latency of providing cooperation information between terminals can be reduced.
- An embodiment of the present specification is proposed to support the above-described scenario.
- the present invention when transmitting control information through 2 nd SCI, the case in which it is transmitted with data and the case in which it is not are considered, and it is not transmitted with data.
- the purpose is to provide detailed methods to solve the power imbalance problem.
- FIG. 1 is a diagram showing a system according to an embodiment of the present disclosure.
- FIG. 1 shows an example of a case in which all V2X terminals (UE-1 and UE-2) are located within the coverage of a base station (In-Coverage, IC). All V2X terminals may receive data and control information from the base station through downlink (DL) or transmit data and control information to the base station through uplink (UL). At this time, data and control information may be data and control information for V2X communication. Data and control information may be data and control information for general cellular communication. In addition, V2X terminals can transmit / receive data and control information for V2X communication through sidelink (Sidelink, SL).
- Sidelink Sidelink
- (b) of FIG. 1 shows an example of a case in which UE-1 is located within the coverage of a base station and UE-2 is located outside the coverage of the base station among V2X terminals. That is, (b) of FIG. 1 shows an example of partial coverage (PC) in which some V2X terminals (UE-2) are located outside the coverage of the base station.
- a V2X terminal (UE-1) located within the coverage of the base station may receive data and control information from the base station through downlink or transmit data and control information to the base station through uplink.
- a V2X terminal (UE-2) located outside the coverage of the base station cannot receive data and control information from the base station through downlink, and cannot transmit data and control information through uplink to the base station.
- the V2X terminal (UE-2) may transmit/receive data and control information for V2X communication with the V2X terminal (UE-1) through a side link.
- (c) of FIG. 1 shows an example of a case where all V2X terminals are located outside the base station's coverage (out-of coverage, OOC). Therefore, the V2X terminals (UE-1 and UE-2) cannot receive data and control information from the base station through downlink, and cannot transmit data and control information through uplink to the base station. V2X terminals (UE-1, UE-2) can transmit / receive data and control information for V2X communication through sidelinks.
- FIG. 1 shows an example of a scenario in which V2X communication is performed between V2X terminals (UE-1 and UE-2) located in different cells.
- V2X terminals UE-1, UE-2
- the V2X terminals are connected to different base stations (RRC connection state) or camping (RRC connection disconnection state, ie RRC idle state) show
- the V2X terminal (UE-1) may be a V2X transmitting terminal and the V2X terminal (UE-2) may be a V2X receiving terminal.
- the V2X terminal (UE-1) may be a V2X receiving terminal
- the V2X terminal (UE-2) may be a V2X transmitting terminal.
- a V2X terminal may receive a system information block (SIB) from a base station to which it has accessed (or is camping), and a V2X terminal (UE-2) to which it has accessed (or is camping) camping) can receive SIBs from other base stations.
- the SIB may be an existing SIB or a separately defined SIB for V2X.
- SIB information received by the V2X terminal (UE-1) and SIB information received by the V2X terminal (UE-2) may be different from each other. Therefore, in order to perform V2X communication between terminals (UE-1, UE-2) located in different cells, it is necessary to additionally interpret SIB information transmitted from different cells by unifying information or signaling information about this. may be
- V2X system composed of V2X terminals (UE-1 and UE-2) for convenience of description, but is not limited thereto and communication may be made between more V2X terminals.
- an interface (uplink and downlink) between a base station and V2X terminals may be named a Uu interface
- a sidelink between V2X terminals may be named a PC5 interface. Therefore, in the present disclosure, they may be used interchangeably.
- a terminal is a vehicle supporting vehicle-to-vehicular (V2V) communication, a vehicle supporting communication between a vehicle and a pedestrian (vehicular-to-pedestrian, V2P), or a handset of a pedestrian (eg, , smartphone), a vehicle supporting communication between a vehicle and a network (vehicular-to-network, V2N), or a vehicle supporting communication between a vehicle and a transportation infrastructure (vehicular-to-infrastructure, V2I).
- V2V vehicle supporting vehicle-to-vehicular
- V2P vehicle supporting communication between a vehicle and a pedestrian
- V2N vehicle-to-network
- V2I vehicle supporting communication between a vehicle and a transportation infrastructure
- a terminal may include a road side unit (RSU) equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with a part of a base station function and a part of a terminal function.
- RSU road side unit
- the base station may be a base station supporting both V2X communication and general cellular communication, or a base station supporting only V2X communication.
- the base station may be a 5G base station (gNB), a 4G base station (eNB), or an RSU. Therefore, in the present disclosure, a base station may be referred to as an RSU.
- FIG. 2 is a diagram illustrating a V2X communication method through a sidelink according to an embodiment of the present disclosure.
- UE-1 201, eg TX terminal
- UE-2 202, eg RX terminal
- UE-1 and UE-2 may perform one-to-one communication, which is It can be called unicast communication.
- the TX terminal and the RX terminal may perform one-to-many communication, which may be referred to as groupcast or multicast.
- UE-1 211, UE-2 212, and UE-3 213 form a group (Group A) to perform groupcast communication.
- the UE-4 (214), UE-5 (215), UE-6 (216), and UE-7 (217) form another group (Group B) to communicate through groupcast can be performed.
- Each terminal performs groupcast communication only within the group to which it belongs, and communication between different groups may be performed through unicast, groupcast, or broadcast communication.
- FIG. 2 it is shown that two groups (Group A and Group B) are formed, but it is not limited thereto.
- V2X terminals may perform broadcast communication.
- Broadcast communication refers to a case in which all V2X terminals receive data and control information transmitted by a V2X transmission terminal through a side link.
- UE-1 211
- UE-4 214
- UE-5 215
- UE-6 216
- UE-7 217
- NR V2X unlike in LTE V2X, a form in which a vehicle terminal sends data to only one specific node through unicast and a form in which data is sent to a plurality of specific nodes through groupcast can be considered.
- unicast and group cast technologies can be usefully used in service scenarios such as platooning, which is a technology in which two or more vehicles are connected to one network and moved in a cluster form.
- unicast communication may be required for the purpose of controlling one specific node by a leader node of a group connected by group driving
- group cast communication may be required for the purpose of simultaneously controlling a group consisting of a number of specific nodes. there is.
- FIG. 3 is a diagram for explaining a resource pool defined as a set (set) of resources on time and frequency used for sidelink transmission and reception according to an embodiment of the present disclosure.
- a resource granularity on the time axis in a resource pool may be a slot.
- a resource allocation unit on the frequency axis may be a sub-channel composed of one or more physical resource blocks (PRBs).
- PRBs physical resource blocks
- an example of a case in which resource pools are allocated non-contiguously in time is described, but resource pools may be allocated in succession in time.
- an example of a case in which resource pools are contiguously allocated in frequency is described, but a method in which resource pools are discontiguously allocated in frequency is not excluded.
- a case 301 in which resource pools are allocated non-contiguously in time is shown.
- a case in which the granularity of resource allocation in time consists of slots is illustrated.
- a sidelink slot may be defined within a slot used for uplink. Specifically, the length of a symbol used as a sidelink within one slot may be set as sidelink BWP (Bandwidth Part) information. Therefore, among slots used for uplink, slots for which the length of symbols set for sidelink is not guaranteed cannot be sidelink slots.
- slots belonging to the resource pool exclude slots in which a Sidelink Synchronization Signal Block (S-SSB) is transmitted.
- S-SSB Sidelink Synchronization Signal Block
- cell-common may mean that terminals in the cell receive configuration of the same information from the base station.
- a method in which the UE receives cell-common information by receiving a sidelink SL-SIB (sidelink system information block) from the base station may be considered. It may also mean a case where the terminal is configured in a UE-specific manner after the RRC connection with the base station is established.
- UE-specific may be replaced with the term UE-dedicated, and may mean that configuration information is received with a specific value for each UE.
- a method of obtaining UE-specific information by receiving an RRC message from the base station may be considered.
- (pre-)configuration can be considered a method in which resource pool information is set and a method in which resource pool information is not set.
- all terminals operating in the resource pool will be operated with common configuration information, except for the case where the terminal is configured in a UE-specific way after the RRC connection with the base station is established.
- the method in which (pre-)configuration is not set in the resource pool information is basically set independently of the resource pool configuration information.
- one or more modes are (pre-)configurated in a resource pool (eg, A, B, and C), and (pre-)configurated information independently of the resource pool configuration information is added to the resource pool (pre-)configuration. ) Can indicate which of the configured modes to use (for example, A or B or C).
- resource allocation may be configured with sidelink Bandwidth Part (BWP) information and may be performed in units of sub-channels.
- a subchannel may be defined as a resource allocation unit on a frequency composed of one or more physical resource blocks (PRBs). That is, a subchannel may be defined as an integer multiple of PRB.
- PRBs physical resource blocks
- a subchannel may be composed of 5 consecutive PRBs
- sizeSubchannel may be the size of 5 consecutive PRBs.
- startRB-Subchannel may indicate a start position of a subchannel on a frequency in a resource pool.
- startRB-Subchannel When resource allocation is performed in units of subchannels on the frequency axis, the RB (Resource Block) index at which the subchannel starts (startRB-Subchannel), information on how many PRBs the subchannel consists of (sizeSubchannel), and the total number of subchannels Resources on a frequency may be allocated through setting information such as (numSubchannel). At this time, information on startRB-Subchannel, sizeSubchannel, and numSubchannel may be (pre-)configurated as resource pool information on a frequency.
- FIG. 4 is a diagram illustrating a method of allocating transmission resources in a sidelink by a base station according to an embodiment of the present disclosure.
- Mode 1 A method of allocating transmission resources in a sidelink by a base station will be referred to as Mode 1 below.
- Mode 1 may be scheduled resource allocation.
- Mode 1 may indicate a method in which a base station allocates resources used for sidelink transmission to RRC-connected terminals in a dedicated scheduling scheme. The method of Mode 1 can be effective for interference management and resource pool management because the base station can manage sidelink resources.
- a transmitting terminal 401 may camp on a base station (cell) 403 (405).
- the camp on may mean, for example, a state in which a terminal in a standby state (RRC_IDLE) can select (or reselect) a base station (cell) as needed and receive system information or paging information. there is.
- RRC_IDLE standby state
- the receiving terminal 402 when the receiving terminal 402 is located within the coverage of the base station (cell) 403, the receiving terminal 402 may camp on the base station (cell) 403 (407). In contrast, when the receiving terminal 402 is located outside the coverage of the base station (cell) 403, the receiving terminal 402 may not camp on the base station (cell) 403.
- the receiving terminal 402 represents a terminal receiving data transmitted by the transmitting terminal 401 .
- the transmitting terminal 401 and the receiving terminal 402 may receive a sidelink system information block (SL-SIB) from the base station 403 (410).
- the SL-SIB information includes sidelink resource pool information for sidelink transmission and reception, parameter setting information for sensing operation, information for setting sidelink synchronization, or carriers for sidelink transmission and reception operating at different frequencies. information may be included.
- the transmission terminal 401 When data traffic for V2X is generated in the transmission terminal 401, the transmission terminal 401 may be connected to the base station 403 and RRC (420).
- the RRC connection between the terminal and the base station may be referred to as Uu-RRC.
- the Uu-RRC connection process 420 may be performed before data traffic is generated by the transmitting terminal 401 .
- the transmitting terminal in Mode 1, in a state in which the Uu-RRC connection process 420 between the base station 403 and the receiving terminal 402 is completed, the transmitting terminal may perform transmission to the receiving terminal through the sidelink. Unlike this, in Mode 1, even when the Uu-RRC connection process 420 between the base station 403 and the receiving terminal 402 is not performed, the transmitting terminal can perform transmission to the receiving terminal through the sidelink.
- the transmitting terminal 401 may request transmission resources capable of V2X communication with the receiving terminal 402 from the base station (430). At this time, the transmitting terminal 401 requests sidelink transmission resources from the base station 403 using a physical uplink control channel (PUCCH), an RRC message, or a medium access control (MAC) control element (CE).
- PUCCH physical uplink control channel
- RRC radio resource control
- CE medium access control control
- the MAC CE may be a buffer status report (BSR) MAC CE of a new format (including at least an indicator indicating that it is a buffer status report for V2X communication and information on the size of buffered data for D2D communication).
- BSR buffer status report
- the transmitting terminal 401 may request sidelink resources through a scheduling request (SR) bit transmitted through an uplink physical control channel.
- SR scheduling request
- the base station 403 may allocate V2X transmission resources to the transmission terminal 401 .
- the base station may allocate transmission resources in a dynamic grant or configured grant scheme.
- a base station may allocate resources for TB transmission through downlink control information (DCI).
- DCI downlink control information
- Sidelink scheduling information included in the DCI may include parameters related to transmission time of initial transmission and retransmission and a frequency allocation location information field.
- the DCI for the dynamic grant method may be CRC scrambled with SL-V-RNTI to indicate that it is a dynamic grant method.
- the base station may periodically allocate resources for TB transmission by setting a semi-persistent scheduling (SPS) interval through Uu-RRC.
- SPS semi-persistent scheduling
- the base station may allocate resources for one TB through DCI.
- Sidelink scheduling information for one TB included in DCI may include parameters related to transmission time and frequency allocation location information of initial transmission and retransmission resources.
- DCI for the configured grant method may be CRC scrambled with SL-SPS-V-RNTI to indicate that it is the configured grant method.
- the configured grant (CG) method can be divided into Type1 CG and Type2 CG. In the case of Type2 CG, it is possible to activate/deactivate resources set with configured grant through DCI.
- the base station 403 may instruct the transmitting terminal 401 to schedule sidelink communication with the receiving terminal 402 through DCI transmission through a physical downlink control channel (PDCCH) (440).
- PDCH physical downlink control channel
- DCI downlink control information
- DCI format 3_0 may be defined as a DCI for scheduling an NR sidelink in one cell
- DCI format 3_1 may be defined as a DCI for scheduling an LTE sidelink in one cell.
- the transmitting terminal 401 may perform transmission without RRC configuration 415 for the sidelink. Unlike this, in the case of unicast or group cast transmission, the transmitting terminal 401 may perform a one-to-one RRC connection with another terminal.
- the RRC connection between terminals may be referred to as PC5-RRC 415, distinguished from Uu-RRC.
- the PC5-RRC 415 may be individually connected between terminals in a group. Referring to FIG. 4, although the connection of the PC5-RRC 415 is shown as an operation after the transmission of the SL-SIB (410), it may be performed at any time before the transmission of the SL-SIB (410) or before the transmission of the SCI.
- the transmitting terminal 401 may transmit SCI (1st stage) to the receiving terminal 402 through a physical sidelink control channel (PSCCH) (460).
- the transmitting terminal 401 may transmit SCI (2nd stage) to the receiving terminal 402 through the PSSCH (470).
- information related to resource allocation may be included in the 1st stage SCI, and other control information may be included in the 2nd stage SCI.
- the transmitting terminal 401 may transmit data to the receiving terminal 402 through the PSSCH (480).
- SCI (1st stage), SCI (2nd stage), and PSSCH may be transmitted together in the same slot.
- FIG. 5 is a diagram illustrating a method of directly allocating transmission resources of a sidelink through sensing in a sidelink according to an embodiment of the present disclosure.
- Mode 2 a method in which a UE directly allocates transmission resources of a sidelink through sensing in the sidelink will be referred to as Mode 2.
- Mode 2 it may be referred to as UE autonomous resource selection.
- the base station 503 provides a sidelink transmission/reception resource pool for V2X as system information, and the transmission terminal 501 can select transmission resources according to a set rule.
- Mode 1 in which the base station directly participates in resource allocation, in FIG. 5, there is a difference in that the transmitting terminal 501 autonomously selects resources and transmits data based on a resource pool previously received through system information.
- a transmitting terminal 501 may camp on a base station (cell) 503 (505).
- the camp on may mean, for example, a state in which a terminal in a standby state (RRC_IDLE) can select (or reselect) a base station (cell) as needed and receive system information or paging information. there is.
- RRC_IDLE standby state
- the transmitting terminal 501 is located within the coverage of the base station (cell) 503
- the transmitting terminal 501 is located within the base station (cell) You can camp on (503) (507).
- the transmitting terminal 501 may not camp on the base station (cell) 503.
- the receiving terminal 502 when the receiving terminal 502 is located within the coverage of the base station (cell) 503, the receiving terminal 502 may camp on the base station (cell) 503 (507). In contrast, when the receiving terminal 502 is located outside the coverage of the base station (cell) 503, the receiving terminal 502 may not camp on the base station (cell) 503.
- the receiving terminal 502 represents a terminal receiving data transmitted by the transmitting terminal 501 .
- the transmitting terminal 501 and the receiving terminal 502 may receive a sidelink system information block (SL-SIB) from the base station 503 (510).
- the SL-SIB information includes sidelink resource pool information for sidelink transmission and reception, parameter setting information for sensing operation, information for setting sidelink synchronization, or carrier information for sidelink transmission and reception operating in different frequencies. can be included
- FIG. 4 The difference between FIG. 4 and FIG. 5 is that in FIG. 4, the base station 503 and the terminal 501 operate in an RRC connected state, whereas in FIG. condition) can work. Also, even in the RRC connected state 520, the base station 503 may allow the transmitting terminal 501 to autonomously select transmission resources without directly participating in resource allocation.
- the RRC connection between the terminal 501 and the base station 503 may be referred to as Uu-RRC 520.
- the transmitting terminal 501 receives a resource pool through the system information received from the base station 503, and the transmitting terminal 501 senses within the configured resource pool. It is possible to directly select resources in the time/frequency domain through (530). When a resource is finally selected, the selected resource is determined as a grant for sidelink transmission.
- the transmitting terminal 501 may perform transmission without RRC configuration 515 for the sidelink. Unlike this, in the case of unicast or group cast transmission, the transmitting terminal 501 may perform a one-to-one RRC connection with another terminal.
- the RRC connection between terminals may be referred to as PC5-RRC 515, distinguished from Uu-RRC.
- the PC5-RRC 515 may be individually connected between terminals in a group. Referring to FIG. 5, although the connection of the PC5-RRC 515 is shown as an operation after the transmission of the SL-SIB (510), it may be performed at any time before the transmission of the SL-SIB (510) or before the transmission of the SCI.
- the transmitting terminal 501 may transmit SCI (1st stage) to the receiving terminal 502 through the PSCCH (550).
- the transmitting terminal 401 may transmit SCI (2nd stage) to the receiving terminal 402 through the PSSCH (560).
- information related to resource allocation may be included in the 1st stage SCI, and other control information may be included in the 2nd stage SCI.
- the transmitting terminal 501 may transmit data to the receiving terminal 502 through the PSSCH (570). In this case, SCI (1st stage), SCI (2nd stage), and PSSCH may be transmitted together in the same slot.
- SCI Downlink Control Information
- SCI format 1-A SCI (1st stage).
- SCI format 2-A SCI format 2-B
- SCI (2nd stage) SCI format 2-A may include information for PSSCH decoding when HARQ feedback is not used or when HARQ feedback is used and includes both ACK or NACK information.
- SCI format 2-B may be used by including information for PSSCH decoding when HARQ feedback is not used or when HARQ feedback is used and only NACK information is included.
- SCI format 2-B may be used only for groupcast transmission.
- FIG. 6 is a diagram illustrating a mapping structure of sidelink physical channels mapped to one slot according to an embodiment of the present disclosure.
- PSFCH Physical Sidelink Control Channel
- PSSCH Physical Sidelink Shared Channel
- PSFCH Physical Sidelink Feedback Channel
- time-wise resources of PSFCH may be (pre-)configurated with resource pool information.
- a time resource in which the PSFCH is transmitted may be (pre-)configurated with one value among 0, 1, 2, and 4 slots.
- '0' means that the PSFCH resource is not used.
- 1, 2, and 4 may mean that PSFCH resources are transmitted in every 1, 2, and 4 slots, respectively.
- PSCCH/PSSCH/PSFCH may be allocated to one or more subchannels in frequency. For details on subchannel allocation, refer to the description of FIG. 3 .
- FIG. 6 to explain the mapping of PSCCH/PSSCH/PSFCH in time, one or more symbols before the transmitting terminal transmits the PSCCH/PSSCH/PSFCH in the corresponding slot are a region 601 for automatic gain control (AGC). ) can be used.
- AGC automatic gain control
- control information related to resource allocation in the first symbols of a slot is transmitted through PSCCH 602 as 1st sidelink control information (SCI), and other control information is transmitted as 2nd SCI 604 in PSSCH area 603 can be sent to Data scheduled by the control information may be transmitted through the PSSCH 603.
- the position in time at which the 2nd stage SCI is transmitted may be mapped from a symbol in which the first PSSCH DMRS (606 or 607) is transmitted.
- the position in time at which the PSSCH DMRS is transmitted may vary according to the PSSCH region allocated to the slot, as shown in FIGS. 6 (a) and 6 (b).
- 605 of FIG. 6 shows an example in which symbols for transmission of signals other than the PSSCH are located in the last area of the slot.
- FIG. 6(a) there is one symbol corresponding to 605, and in this case, the symbol corresponding to 605 is used as a gap symbol.
- FIG. 6(b) shows a case where a plurality of symbols corresponding to 605 are secured, and the corresponding symbol region can be used as a gap symbol, a PSFCH symbol, and a downlink (DL) / uplink (UL) symbol.
- * represents the number of bits of information included in the 2nd SCI. Depending on the 2nd SCI format used, the number of bits of included information may vary.
- * may be determined using a bit field included in the 1st SCI as a parameter for adjusting the number of coded bits of the 2nd SCI.
- * represents a modulation degree used for transmission in 2nd SCI.
- the corresponding value may be fixed as QPSK.
- * Represents a coding rate used for transmission in 2nd SCI.
- the corresponding value may be determined using a bit field included in 1st SCI, and the coding rate may be the same as the coding rate used for data transmission.
- the number of REs (Resource Elements) used for transmission to the 2nd SCI in can be defined as here is the sibol index Indicates the number of REs in the bandwidth scheduled for PSSCH transmission, is the symbol index Indicates the number of subcarriers used for transmission of PSCCH and PSCCH DMRS, that is, the number of REs.
- * is a value used as a parameter for determining the amount to which 2nd SCI is mapped, and may be a value set in an upper layer.
- the RE remaining in the RB of the (OFDM or SC-FDMA) symbol to which the last symbol among the (modulated) symbols generated by coding the 2nd SCI is mapped (that is, the RE to which the 2nd SCI is not mapped) ), it is a variable determined so that the 2 nd SCI is mapped to all remaining REs of the corresponding RB.
- an example of a case in which data is not transmitted together in the PSSCH region when the 2 nd SCI is transmitted through the PSSCH is (a-2) and (b-2), respectively.
- control information transmitted through 2nd SCI when control information is transmitted through 2nd SCI, a case in which control information is transmitted together with data and a case in which it is not transmitted are considered, and detailed methods for solving the power imbalance problem in a case where control information is not transmitted together with data are proposed.
- the control information transmitted through the 2nd SCI may include information for inter-UE coordination, and information shared for inter-UE coordination is not limited to specific information in the present invention.
- cooperation information between terminals may be resource allocation related information.
- Embodiment 1-1 proposes methods for solving the power imbalance problem when control information is not transmitted together with data when transmitting control information through 2 nd SCI.
- Embodiments 1-4 specific terminal operations for a case where control information is transmitted together with data when transmitting control information through 2 nd SCI and a case where it is not transmitted are presented. It should be noted that all embodiments disclosed in the present invention may be used in combination with each other for specific technical purposes unless technically contradicting each other.
- the terminal may be a vehicle terminal and a pedestrian terminal.
- FIG. 7 is a diagram illustrating a scenario of performing inter-UE coordination according to an embodiment of the present disclosure.
- cooperation between terminals may mean providing an enhanced sidelink service by sharing helpful information between terminals.
- Resource allocation related information may be included as such information. For example, when a terminal performing transmission on a sidelink allocates resources through a direct sensing and resource selection procedure (Mode2), or when a terminal performing transmission is within the coverage of a base station (BS), resources are allocated from the base station. can be assigned (Mode1). However, a method in which a terminal receives resource allocation and resource allocation-related information from another terminal through inter-UE coordination may be considered. Alternatively, location information of the terminal may be included as cooperation information between terminals.
- information shared for cooperation between terminals is not limited to specific information. More generally, a case in which necessary information between terminals is indicated through 2 nd SCI is considered and this information is referred to as coordination information between terminals.
- FIG. 7 a scenario in which inter-UE coordination is performed in a sidelink is shown.
- UE-A 701 corresponds to a UE that provides coordination information between UEs to UE-B 702, and UE-B 702 cooperates with UE-A 701.
- FIG. 7(a) a case in which UE-A 701 corresponds to an intended receiving terminal for UE-B 702 is illustrated.
- FIG. 7(b) a case where an arbitrary terminal can be a UE-A 701 providing cooperation information between terminals is illustrated.
- FIG. 7(a) a case in which an arbitrary terminal can be a UE-A 701 providing cooperation information between terminals is illustrated.
- FIG. 7(a) a case in which an arbitrary terminal can be a UE-A 701 providing cooperation information between terminals is illustrated.
- FIG. 7(b) a case where an arbitrary terminal can be a UE-A 701 providing cooperation information between terminals
- UE-A 701 is not a receiving terminal 703 for UE-B 702 is shown.
- UE-B can receive inter-UE cooperation information from UE-A and can receive assistance in performing sidelink transmission.
- UE-A a terminal providing related information for inter-device cooperation
- UE-B a terminal receiving related information for inter-device cooperation
- certain UE(s) may be a UE that provides cooperation information between UEs, such as UE-A, or a UE receiving cooperation information between UEs, such as UE-B. .
- UE-A UE that provides cooperation information between UEs
- UE-B UE receiving cooperation information between UEs
- UE-B resource allocation information
- one or more terminals may have qualifications to perform the role of UE-A (or UE-B). However, it is not necessary for all UEs qualified to perform the role of UE-A (or UE-B) to become UE-A (or UE-B). Therefore, UE-A (or UE-B) can be selected as needed. In other words, the role of UE-A (or UE-B) may be performed without performing the role of UE-A (or UE-B), and vice versa. However, it may not perform the role of UE-A (or UE-B).
- FIG. 8 is a diagram for explaining an operation of requesting coordination information between terminals and transmitting the corresponding information through 2 nd SCI according to an embodiment of the present disclosure.
- 8(a) corresponds to a case 803 in which UE-B 802 requests inter-UE cooperation information from UE-A 801 using 2 nd SCI and transmits it along with data in the PSSCH region. If, when UE-A (801) provides inter-terminal cooperation information to UE-B (802), a method that is periodically provided at a defined point in time is used instead of a method requested by UE-B (802) In this case, the corresponding operation may not be considered.
- 8(b) corresponds to a case 804 in which data is not transmitted along with data in the PSSCH region when UE-B 802 requests UE-A 801 for UE-to-UE cooperation information using 2nd SCI. If, when UE-A (801) provides inter-terminal cooperation information to UE-B (802), a method that is periodically provided at a defined point in time is used instead of a method requested by UE-B (802) In this case, the corresponding operation may not be considered.
- FIG. 8(c) corresponds to a case (805) when UE-A (801) provides UE-to-UE cooperation information to UE-B (802) using 2nd SCI and is transmitted together with data in the PSSCH region.
- 8(d) corresponds to a case in which UE-A (801) provides inter-UE cooperation information to UE-B (802) using 2 nd SCI and is not transmitted along with data in the PSSCH region (806). .
- UE-B 802 when UE-B 802 requests inter-UE cooperation information from UE-A 801 through 2 nd SCI, it is transmitted together with data as shown in FIG. 8 (a) and FIG. 8 (b ), it is intended to provide a terminal operation that varies depending on the case in which data is not transmitted together through the following embodiments.
- UE-A (801) when UE-A (801) provides inter-UE cooperation information to UE-B (802) through 2nd SCI, it is transmitted together with data as shown in FIG. 8 (c) and FIG. 8 ( As in d), the terminal operation that varies depending on the case where data is not transmitted is provided through the following embodiments.
- Embodiment 1-2 proposes methods for solving the power imbalance problem when control information is not transmitted together with data when transmitting control information through 2 nd SCI.
- Control information transmitted through 2 nd SCI may be information for performing inter-UE coordination in sidelink.
- the terminal may be a vehicle terminal and a pedestrian terminal.
- 9 is a diagram for explaining methods for solving a power imbalance problem when control information is not transmitted along with data when transmitting control information through 2 nd SCI according to an embodiment of the present disclosure.
- FIG. 9(a) an example of a case in which data is not transmitted together in the PSSCH region when the 2 nd SCI is transmitted through the PSSCH is shown.
- data is not transmitted in the PSSCH region and the 2 nd SCI is mapped to the PSSCH region according to Equation 1 above, as shown in FIG .
- power imbalance may occur between the corresponding symbol and the previous symbol(s) to which the 2 nd SCI is mapped.
- Equation 2 when control information is transmitted through 2nd SCI and not transmitted along with data, all 2nd SCI is mapped to the frequency domain of PSSCH in the last symbol to be transmitted.
- the number of bits or symbols in which the 2nd SCI is coded using channel coding can be calculated as in Equation 2 below.
- Symbol index in Equation 2 below may be defined based on symbols used to transmit PSCCH/PSSCH except for the first symbol in a slot used for AGC.
- Equation 2 For a description of the parameter in Equation 2, refer to Equation 1 above. In Equation 1, the parameter is used, but in Equation 2 Instead of Note that is used. and can be defined as:
- the RE remaining in the (OFDM or SC-FDMA) symbol to which the last symbol among the (modulated) symbols generated by coding the 2nd SCI is mapped (that is, the RE to which the 2nd SCI is not mapped) If there is, it is a variable determined so that 2nd SCI is mapped to all remaining REs.
- Equation 1 is a variable determined so that the 2 nd SCI is mapped only to the remaining REs in the RB, while is a variable determined so that the 2nd SCI is mapped to all REs remaining in the frequency domain of the PSSCH.
- FIG. 9 (b) an example of Method 1 is shown.
- the 2nd SCI is mapped to all regions of the frequency of the PSSCH in the last symbol to be transmitted (902)
- the power is the same between the symbol and the previous symbol (s) to which the 2nd SCI is mapped It is maintained and the power imbalance generated in FIG. 9 (a) can be solved.
- Equation 1 A method of adjusting the value of may be considered.
- a method of discarding information included in some 2nd SCI may be considered.
- information included in the 2nd SCI may be different between a case in which the 2nd SCI is transmitted together with data and a case in which it is not transmitted together with data.
- the 2nd SCI is not transmitted along with data, it may be defined not to include some information in the 2nd SCI.
- the 2 nd SCI has the same format, but the included information may be different, and the terminal can distinguish between the case where the 2 nd SCI is transmitted with data and the case where it is not transmitted together with data.
- the 2 nd SCI is interpreted in different formats for each case where the 2 nd SCI is transmitted together with data and when it is not transmitted together with data.
- FIG. 9(c) an example of Method 2 is shown. As shown in FIG. 9(c), if method 2 is used so that the 2nd SCI is not mapped to a partial region of the PSSCH frequency in the last symbol transmitted, and the 2nd SCI is not mapped to the corresponding symbol (903), FIG. ) can solve the power imbalance.
- Control information transmitted through 2 nd SCI may be information for performing inter-UE coordination in sidelink.
- the terminal may be a vehicle terminal and a pedestrian terminal.
- 10 is a diagram for explaining methods for solving a power imbalance problem when control information is not transmitted along with data when transmitting control information through 2 nd SCI according to an embodiment of the present disclosure.
- FIG. 10 (a) an example of a case where data is not transmitted together in the PSSCH region when the 2 nd SCI is transmitted through the PSSCH is illustrated.
- data is not transmitted in the PSSCH region and 2nd SCI is mapped to the PSSCH region according to Equation 1 above, as shown in FIG .
- power imbalance may occur between the corresponding symbol and the previous symbol(s) to which the 2nd SCI is mapped.
- the 2nd SCI when control information is transmitted through the 2nd SCI and it is not transmitted along with data, the 2nd SCI can be mapped from the first symbol of the PSSCH DMRS to the last symbol of the PSSCH.
- the number of bits or symbols in which the 2nd SCI is coded using channel coding can be calculated as in Equation 3 below.
- Symbol index in Equation 3 below may be defined based on symbols used to transmit PSCCH/PSSCH except for the first symbol in a slot used for AGC.
- the number of REs (Resource Elements) used for transmission to the 2nd SCI in can be defined as here is the symbol index Indicates the number of REs in the bandwidth scheduled for PSSCH transmission, is the symbol index Indicates the number of subcarriers used for transmission of PSCCH and PSCCH DMRS, that is, the number of REs.
- * is the symbol index This is a parameter for indicating a symbol through which the first PSSCH DMRS is transmitted in .
- the first PSSCH DMRS is transmitted at SL symbol index 4. Therefore, in the example of FIG. 10, the symbol index based on This can be.
- FIG. 10 (b) an example of Method 3 is shown. As shown in FIG. 10 (b), if the 2 nd SCI is transmitted so that it is mapped from the first symbol of the PSSCH DMRS to the last symbol of the PSSCH, the power imbalance generated in (1001) of FIG. 10 (a) can be solved.
- the 2 nd SCI when control information is transmitted through the 2 nd SCI, if it is not transmitted along with data, the 2 nd SCI can be mapped from the first symbol of the PSSCH DMRS to the symbol to which the last PSSCH DMRS is transmitted. .
- the number of bits or symbols in which the 2nd SCI is coded using channel coding can be calculated as in Equation 4 below.
- Symbol index in Equation 4 below may be defined based on symbols used to transmit PSCCH/PSSCH except for the first symbol in a slot used for AGC.
- the number of REs (Resource Elements) used for transmission to the 2nd SCI in can be defined as here is the symbol index Indicates the number of REs in the bandwidth scheduled for PSSCH transmission, is the symbol index Indicates the number of subcarriers used for transmission of PSCCH and PSCCH DMRS, that is, the number of REs.
- Equation 1 is the symbol index It is a parameter for indicating a symbol through which the first PSSCH DMRS is transmitted in .
- the first PSSCH DMRS is transmitted at SL symbol index 4. Therefore, in the example of FIG. 10, the symbol index based on This can be.
- Equation 1 For details on , refer to Equation 1.
- Equation 1 is the symbol index It is a parameter for indicating a symbol through which the last PSSCH DMRS is transmitted in .
- the last PSSCH DMRS is transmitted at SL symbol index 10. Therefore, in the example of FIG. 10, the symbol index based on This can be.
- Equation 1 For details on , refer to Equation 1.
- FIG. 10(c) an example of Method 4 is shown. As shown in FIG. 10 (c), if the 2nd SCI is transmitted so that it is mapped from the first symbol of the PSSCH DMRS to the symbol to which the last PSSCH DMRS is transmitted, the power imbalance generated in FIG. 10 (a) (1001) can be solved. .
- Equation 5 when control information is transmitted through the 2nd SCI, if it is not transmitted along with data, the 2nd SCI can be mapped to all areas of the PSSCH.
- the number of bits or symbols in which the 2nd SCI is coded using channel coding can be calculated as in Equation 5 below.
- Symbol index in Equation 5 below may be defined based on symbols used to transmit PSCCH/PSSCH except for the first symbol in a slot used for AGC.
- the number of REs (Resource Elements) used for transmission to the 2nd SCI in can be defined as here is the symbol index Indicates the number of REs in the bandwidth scheduled for PSSCH transmission, is the symbol index Indicates the number of subcarriers used for transmission of PSCCH and PSCCH DMRS, that is, the number of REs.
- Equation 5 can be derived by setting the value of .
- a large set the value of set the value of to 1 It can be interpreted as setting the value of to 0.
- FIG. 10(d) an example of Method 5 is shown. As shown in FIG. 10(d), if the 2 nd SCI is transmitted so as to be mapped to all regions of the PSSCH, the power imbalance generated in (1001) in FIG. 10(a) can be solved.
- FIG. 11 is a diagram illustrating terminal operations when control information is transmitted together with data and when control information is not transmitted through 2nd SCI.
- Embodiments 1-4 specific terminal operations for a case where control information is transmitted together with data and a case where it is not transmitted through the 2 nd SCI are presented through drawings.
- the terminal when the terminal transmits control information through the 2 nd SCI in step 1100, if it is not transmitted along with data, it moves to step 1101, and the number of bits coded using channel coding for the 2 nd SCI or The number of symbols can be determined through a new method. Specifically, methods 1 to 5 proposed in the above embodiment may be used. Note, however, that the present invention is not limited to the above proposed methods.
- the terminal transmits control information through the 2 nd SCI in step (1100) if it is transmitted together with data, it moves to step 1102 and the number of bits or symbols coded using the channel coding of the 2 nd SCI will be able to determine In this case, Equation 1 according to the existing method may be used.
- FIGS. 12 and 13 a transmitter, a receiver, and a processor of a terminal and a base station are shown in FIGS. 12 and 13, respectively.
- a method for a UE to transmit control information through 2nd SCI in a sidelink is shown.
- FIG. 12 is a block diagram illustrating the internal structure of a terminal according to an embodiment of the present invention.
- the terminal of the present invention may include a terminal receiving unit 1200, a terminal transmitting unit 1204, and a terminal processing unit 1202.
- the terminal receiver 1200 and the terminal transmitter 1204 may be collectively referred to as a transceiver in an embodiment of the present invention.
- the transmitting/receiving unit may transmit/receive signals with the base station.
- the signal may include control information and data.
- the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
- the transmitting/receiving unit may receive a signal through a wireless channel, output the signal to the terminal processing unit 1202, and transmit the signal output from the terminal processing unit 1202 through the wireless channel.
- the terminal processing unit 1202 can control a series of processes so that the terminal can operate according to the above-described embodiment of the present invention.
- FIG. 13 is a block diagram showing the internal structure of a base station according to an embodiment of the present invention.
- the base station of the present invention may include a base station receiving unit 1301, a base station transmitting unit 1305, and a base station processing unit 1303.
- the base station receiving unit 1301 and the base station transmitting unit 1305 may collectively be referred to as transceivers in an embodiment of the present invention.
- the transmission/reception unit may transmit/receive signals with the terminal.
- the signal may include control information and data.
- the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
- the transceiver may receive a signal through a radio channel, output the signal to the base station processor 1303, and transmit the signal output from the base station processor 1303 through a radio channel.
- the base station processing unit 1303 can control a series of processes so that the base station can operate according to the above-described embodiment of the present invention.
- each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions.
- These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates means to perform functions.
- These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory
- the instructions stored in are also capable of producing an article of manufacture containing instruction means that perform the functions described in the flowchart block(s).
- the computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).
- each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is possible for the functions mentioned in the blocks to occur out of order. For example, two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in reverse order depending on their function.
- ' ⁇ unit' used in this embodiment means software or a hardware component such as FPGA or ASIC, and ' ⁇ unit' performs certain roles.
- ' ⁇ part' is not limited to software or hardware.
- ' ⁇ bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, ' ⁇ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
- components and ' ⁇ units' may be combined into smaller numbers of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
- components and ' ⁇ units' may be implemented to play one or more CPUs in a device or a secure multimedia card.
- ' ⁇ unit' may include one or more processors.
- the radio access network New RAN on the 5G mobile communication standard disclosed by the 3rd generation partnership project long term evolution (3GPP), a mobile communication standardization organization, and the packet core (a core network) 5G System, or 5G Core Network, or NG Core: next generation core) as the main target, but the main point of the present disclosure is to other communication systems having a similar technical background to the extent that it does not greatly depart from the scope of the present disclosure. It can be applied with slight modifications, which will be possible with the judgment of those skilled in the art of the present disclosure.
- NWDAF network data collection and analysis function
- NWDAF can collect/store/analyze information from the 5G network and provide the result to an unspecified network function (NF), and the analysis result can be used independently in each NF.
- NF network function
- 3GPP standards 5G, NR, LTE, or similar system standards
- 3GPP standards 5G, NR, LTE, or similar system standards
- present disclosure is not limited by terms and names, and may be equally applied to systems conforming to other standards.
- the 5G communication system is designed to enable resources in a mmWave band (eg, a 28 GHz frequency band).
- a mmWave band eg, a 28 GHz frequency band.
- beamforming, massive MIMO, and Full Dimensional MIMO are used in 5G communication systems.
- array antenna, analog beam-forming, and large scale antenna technologies are being discussed.
- the 5G communication system volunteers various subcarrier spacings such as 30 kHz, 60 kHz, and 120 kHz, including 15 kHz, and uses Polar Coding for the physical control channel.
- the data channel Physical Data Channel
- LDPC Low Density Parity Check
- DFT-S-OFDM Downlink Packet Control
- CP-OFDM Downlink Packet Control Protocol
- HARQ Hybrid ARQ
- 5G may additionally volunteer HARQ retransmission based on Code Block Group (CBG) in which several Code Blocks (CBs) are bundled.
- CBG Code Block Group
- CBs Code Blocks
- a plurality of services may be provided to the user, and a method capable of providing each service within the same time period according to characteristics and a device using the same are required to provide the plurality of services to the user.
- various services provided by the 5G communication system are being studied, and one of them is a service that satisfies low latency and high reliability requirements.
- unicast communication between terminals and terminals, groupcast (or multicast) communication, and broadcast communication are supported in the NR V2X system.
- NR V2X unlike LTE V2X, which aims to transmit and receive basic safety information required for vehicle road driving, is group driving (platooning), advanced driving (Advanced Driving), extended sensor (Extended Sensor), remote driving (Remote Driving) and We aim to provide more advanced services together.
- inter-UE coordination may be considered in sidelink.
- cooperation between terminals may mean providing a more improved sidelink service by sharing helpful information between terminals.
- information shared for cooperation between terminals is not limited to specific information.
- resource allocation information may be included as such information.
- 2nd Sidelink Control Information SCI
- PSSCH Physical Sidelink Shared Channel
- a method of transmitting along with data information was considered.
- cooperation information is shared between terminals in the sidelink, there may be a case where there is no data to be transmitted from a terminal providing it to a terminal receiving it.
- the present invention when transmitting the 2nd SCI, the case where the 2nd SCI is not transmitted together with data information is considered.
- the terminal receiving control information through the 2nd SCI needs to know whether the 2nd SCI is transmitted with data information or only the control information is transmitted through the 2nd SCI without data.
- the present invention proposes various methods for the terminal to indicate this. Through the method proposed in the present invention, cooperation information between terminals can be transmitted through 2nd SCI regardless of whether the terminal has data to be transmitted, and thus the latency of providing cooperation information between terminals can be reduced.
- FIG. 14 is a diagram showing an example of a V2X system according to an embodiment of the present disclosure.
- (a) 1400 of FIG. 14 shows an example of a case in which all V2X terminals (UE-1 and UE-2) are located within the coverage of a base station (In-Coverage, IC). All V2X terminals may receive data and control information from the base station through downlink (DL) or transmit data and control information to the base station through uplink (UL). At this time, data and control information may be data and control information for V2X communication. Data and control information may be data and control information for general cellular communication. In addition, V2X terminals can transmit / receive data and control information for V2X communication through sidelink (Sidelink, SL).
- Sidelink Sidelink
- (b) 1410 of FIG. 14 shows an example of a case in which UE-1 is located within the coverage of a base station and UE-2 is located outside the coverage of the base station among V2X terminals. That is, (b) 1410 of FIG. 14 shows an example of partial coverage (PC) in which some V2X terminals (UE-2) are located outside the coverage of the base station.
- a V2X terminal (UE-1) located within the coverage of the base station may receive data and control information from the base station through downlink or transmit data and control information to the base station through uplink.
- a V2X terminal (UE-2) located outside the coverage of the base station cannot receive data and control information from the base station through downlink, and cannot transmit data and control information through uplink to the base station.
- the V2X terminal (UE-2) may transmit/receive data and control information for V2X communication with the V2X terminal (UE-1) through a sidelink.
- (c) 1420 of FIG. 14 shows an example of a case where all V2X terminals are located outside the base station's coverage (out-of coverage, OOC). Therefore, the V2X terminals (UE-1 and UE-2) cannot receive data and control information from the base station through downlink, and cannot transmit data and control information through uplink to the base station. V2X terminals (UE-1, UE-2) can transmit / receive data and control information for V2X communication through sidelinks.
- (d) 1430 of FIG. 14 shows an example of a scenario in which V2X communication is performed between V2X terminals (UE-1 and UE-2) located in different cells.
- V2X terminals UE-1 and UE-2
- RRC connection state when V2X terminals (UE-1 and UE-2) are connected to different base stations (RRC connection state) or camping (RRC connection release state, ie RRC idle state) state) is shown.
- the V2X terminal (UE-1) may be a V2X transmitting terminal and the V2X terminal (UE-2) may be a V2X receiving terminal.
- the V2X terminal (UE-1) may be a V2X receiving terminal
- the V2X terminal (UE-2) may be a V2X transmitting terminal.
- a V2X terminal (UE-1) may receive a system information block (SIB) from a base station to which it has accessed (or is camping), and a V2X terminal (UE-2) to which it has accessed (or is camping) camping) can receive SIBs from other base stations.
- the SIB may be an existing SIB or a separately defined SIB for V2X.
- SIB information received by the V2X terminal (UE-1) and SIB information received by the V2X terminal (UE-2) may be different from each other. Therefore, in order to perform V2X communication between terminals (UE-1 and UE-2) located in different cells, it is necessary to additionally interpret SIB information transmitted from different cells by unifying information or signaling information about this. may be
- V2X system composed of V2X terminals (UE-1 and UE-2) for convenience of description, but is not limited thereto, and communication may be made between more V2X terminals.
- V2X terminals UE-1 and UE-2
- communication may be made between more V2X terminals.
- an interface uplink and downlink
- Uu interface an interface between a base station and V2X terminals
- PC5 interface a sidelink between V2X terminals
- a terminal is a vehicle supporting vehicle-to-vehicular (V2V) communication, a vehicle supporting communication between a vehicle and a pedestrian (vehicular-to-pedestrian, V2P), or a handset of a pedestrian (eg, , smartphone), a vehicle supporting communication between a vehicle and a network (vehicular-to-network, V2N), or a vehicle supporting communication between a vehicle and a transportation infrastructure (vehicular-to-infrastructure, V2I).
- V2V vehicle supporting vehicle-to-vehicular
- V2P vehicle supporting communication between a vehicle and a pedestrian
- V2N vehicle-to-network
- V2I vehicle supporting communication between a vehicle and a transportation infrastructure
- a terminal may include a road side unit (RSU) equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with a part of a base station function and a part of a terminal function.
- RSU road side unit
- the base station may be a base station supporting both V2X communication and general cellular communication, or a base station supporting only V2X communication.
- the base station may be a 5G base station (gNB), a 4G base station (eNB), or an RSU. Therefore, in the present disclosure, a base station may be referred to as an RSU.
- 15 is a diagram illustrating an example of a V2X communication method performed through a sidelink according to an embodiment of the present disclosure.
- UE-1 201, eg TX terminal
- UE-2 202, eg RX terminal
- unicast communication this may be referred to as unicast communication.
- the TX terminal and the RX terminal may perform one-to-many communication, which may be referred to as groupcast or multicast.
- groupcast or multicast.
- UE-1 (1511), UE-2 (1512), and UE-3 (1513) form one group (Group A) and perform groupcast
- UE-4 (1514), UE-5 (1515), UE-6 (1516), and UE-7 (1517) form another group (Group B) and group cast ( groupcast) communication.
- Each terminal performs groupcast communication only within the group to which it belongs, and communication between different groups may be performed through unicast, groupcast, or broadcast communication.
- FIG. 15 it is shown that two groups (Group A and Group B) are formed, but it is not limited thereto.
- V2X terminals may perform broadcast communication.
- Broadcast communication refers to a case in which all V2X terminals receive data and control information transmitted by a V2X transmission terminal through a sidelink.
- UE-1 1511
- UE-2 1512
- UE-3 1513
- UE -4 1514
- UE-5 1515
- UE-6 1516
- UE-7 1517
- NR V2X unlike in LTE V2X, support for a form in which a vehicle terminal sends data to only one specific node through unicast and a form in which data is sent to a plurality of specific nodes through groupcast can be considered.
- unicast and group cast technologies can be usefully used in service scenarios such as platooning, which is a technology in which two or more vehicles are connected to one network and moved in a cluster form.
- unicast communication may be required for the purpose of controlling one specific node by a leader node of a group connected by group driving
- group cast communication may be required for the purpose of simultaneously controlling a group consisting of a number of specific nodes. there is.
- a resource granularity on the time axis in a resource pool may be a slot.
- a resource allocation unit on the frequency axis may be a sub-channel composed of one or more physical resource blocks (PRBs).
- PRBs physical resource blocks
- an example of a case in which resource pools are allocated non-contiguously in time is described, but resource pools may be allocated in succession in time.
- an example of a case in which resource pools are contiguously allocated in frequency is described, but a method in which resource pools are discontiguously allocated in frequency is not excluded.
- a case 1601 in which resource pools are allocated non-contiguously in time is illustrated.
- a case in which the granularity of resource allocation in time consists of slots is illustrated.
- a sidelink slot may be defined within a slot used for uplink. Specifically, the length of a symbol used as a sidelink within one slot may be set as sidelink BWP (Bandwidth Part) information. Therefore, among slots used for uplink, slots for which the length of symbols set for sidelink is not guaranteed cannot be sidelink slots. Also, slots in which S-SSB (Sidelink Synchronization Signal Block) is transmitted to slots belonging to the resource pool are excluded.
- S-SSB Servicelink Synchronization Signal Block
- a set of slots that can be used as sidelinks on the time axis, excluding the above slots, is ( , , , ,).
- the shaded highlighted portion represents sidelink slots belonging to the resource pool.
- Sidelink slots belonging to a resource pool may be (pre-)configurated with resource pool information through a bitmap.
- (pre-)configuration may mean configuration information pre-configurated and stored in the terminal, or may mean a case in which the terminal is configured in a cell-common method from the base station.
- cell-common may mean that terminals in the cell receive the same configuration information from the base station.
- the terminal may obtain cell-common information by receiving a sidelink SL-SIB (sidelink system information block) from the base station.
- (pre-)configuration may mean a case in which the terminal is configured in a UE-specific manner after the RRC connection with the base station is established.
- UE-specific may be replaced with the term UE-dedicated, and may mean that configuration information of a specific value is received for each UE.
- the UE may obtain UE-specific information by receiving an RRC message from the base station.
- (pre-)configuration may consider a method in which resource pool information is set and a method in which resource pool information is not set.
- all terminals operating in the resource pool are configured based on common configuration information, except for the case where the terminal is configured in a UE-specific manner after the RRC connection with the base station is established. It can work.
- (pre-)configuration is not set with resource pool information, (pre-)configuration can be set independently of resource pool configuration information by default.
- one or more modes are (pre-)configurated in a resource pool (for example, A, B, and C), and (pre-)configurated information independently of the resource pool configuration information is added to the resource pool (pre-)configuration. ) Can indicate which of the configured modes to use (for example, A or B or C).
- resource allocation may be configured with sidelink Bandwidth Part (BWP) information and may be performed in units of sub-channels.
- a subchannel may be defined as a resource allocation unit on a frequency composed of one or more physical resource blocks (PRBs). That is, a subchannel may be defined as an integer multiple of PRB.
- PRBs physical resource blocks
- a subchannel may be composed of 5 consecutive PRBs
- sizeSubchannel may be the size of 5 consecutive PRBs.
- a subchannel may be a basic unit of resource allocation for PSSCH.
- startRB-Subchannel may indicate a start position of a subchannel on a frequency in a resource pool.
- the RB (Resource Block) index at which the subchannel starts (startRB-Subchannel)
- information on how many PRBs the subchannel consists of (sizeSubchannel)
- the total number of subchannels Resources on a frequency may be allocated through setting information such as (numSubchannel).
- information on startRB-Subchannel, sizeSubchannel, and numSubchannel may be (pre-)configurated as resource pool information on a frequency.
- 17 is a diagram illustrating an example of a method of allocating transmission resources in a sidelink by a base station according to an embodiment of the present disclosure.
- Mode 1 A method of allocating transmission resources in a sidelink by a base station according to FIG. 17 will be referred to as Mode 1 below.
- Mode 1 may be scheduled resource allocation.
- Mode 1 may indicate a method in which a base station allocates resources used for sidelink transmission to RRC-connected terminals in a dedicated scheduling scheme. The method of Mode 1 can be effective for interference management and resource pool management because the base station can manage sidelink resources.
- a transmitting terminal 1701 may camp on a base station (cell) 1703 (1705).
- the camp on may mean, for example, a state in which a terminal in a standby state (RRC_IDLE) can select (or reselect) a base station (cell) as needed and receive system information or paging information. there is.
- RRC_IDLE standby state
- the receiving terminal 1702 when the receiving terminal 1702 is located within the coverage of the base station (cell) 1703, the receiving terminal 1702 may camp on the base station (cell) 1703 (1707). In contrast, when the receiving terminal 1702 is located outside the coverage of the base station (cell) 1703, the receiving terminal 1702 may not camp on the base station (cell) 1703.
- a receiving terminal 1702 represents a terminal receiving data transmitted by a transmitting terminal 1701 .
- the transmitting terminal 1701 and the receiving terminal 1702 may receive a sidelink system information block (SL-SIB) from the base station 1703 (1710).
- the SL-SIB information includes sidelink resource pool information for sidelink transmission and reception, parameter setting information for sensing operation, information for setting sidelink synchronization, or carriers for sidelink transmission and reception operating at different frequencies. information may be included.
- the transmission terminal 1701 When data traffic for V2X is generated in the transmission terminal 1701, the transmission terminal 1701 may be connected to the base station 1703 and RRC (1720).
- the RRC connection between the terminal and the base station may be referred to as Uu-RRC.
- the Uu-RRC connection process 1720 may be performed before data traffic is generated by the transmitting terminal 1701.
- Mode 1 in a state in which the Uu-RRC connection process 1720 between the base station 1703 and the receiving terminal 1702 has been completed, the transmitting terminal can transmit to the receiving terminal through the sidelink. Unlike this, in Mode 1, even when the Uu-RRC connection process 1720 between the base station 1703 and the receiving terminal 1702 is not performed, the transmitting terminal can transmit to the receiving terminal through the sidelink.
- the transmitting terminal 1701 may request transmission resources capable of V2X communication with the receiving terminal 1702 from the base station (1730). At this time, the transmitting terminal 1701 requests sidelink transmission resources from the base station 1703 using a physical uplink control channel (PUCCH), an RRC message, or a medium access control (MAC) control element (CE).
- PUCCH physical uplink control channel
- RRC radio resource control
- CE medium access control control
- the MAC CE may be a buffer status report (BSR) MAC CE of a new format (including at least an indicator indicating that it is a buffer status report for V2X communication and information on the size of buffered data for D2D communication).
- BSR buffer status report
- the transmitting terminal 401 may request sidelink resources through a scheduling request (SR) bit transmitted through an uplink physical control channel.
- SR scheduling request
- the base station 1703 may allocate V2X transmission resources to the transmission terminal 1701. At this time, the base station may allocate transmission resources in a dynamic grant or configured grant scheme.
- a base station may allocate resources for TB transmission through downlink control information (DCI).
- DCI downlink control information
- Sidelink scheduling information included in the DCI may include parameters related to transmission time of initial transmission and retransmission and a frequency allocation location information field.
- the DCI for the dynamic grant method may be CRC scrambled with SL-V-RNTI to indicate that it is a dynamic grant method.
- the base station may periodically allocate resources for TB transmission by setting a semi-persistent scheduling (SPS) interval through Uu-RRC.
- SPS semi-persistent scheduling
- the base station may allocate resources for one TB through DCI.
- Sidelink scheduling information for one TB included in DCI may include parameters related to transmission time and frequency allocation location information of initial transmission and retransmission resources.
- DCI for the configured grant method may be CRC scrambled with SL-SPS-V-RNTI to indicate that it is the configured grant method.
- the configured grant (CG) method can be divided into Type1 CG and Type2 CG. In the case of Type2 CG, it is possible to activate/deactivate resources set with configured grant through DCI.
- the base station 1703 may instruct the transmitting terminal 1701 to schedule sidelink communication with the receiving terminal 1702 through DCI transmission through a physical downlink control channel (PDCCH) (1740).
- PDCH physical downlink control channel
- DCI downlink control information
- DCI format 3_0 may be defined as a DCI for scheduling an NR sidelink in one cell
- DCI format 3_1 may be defined as a DCI for scheduling an LTE sidelink in one cell.
- the transmitting terminal 1701 can perform transmission without RRC configuration 1715 for the sidelink. Unlike this, in the case of unicast or group cast transmission, the transmitting terminal 1701 may perform a one-to-one RRC connection with another terminal.
- the RRC connection between terminals may be referred to as PC5-RRC 1715, distinguished from Uu-RRC.
- the PC5-RRC 1715 can be individually connected between terminals in a group. Referring to FIG. 17, although the connection of the PC5-RRC 1715 is shown as an operation after the transmission of the SL-SIB (1710), it may be performed at any time before the transmission of the SL-SIB (1710) or before the transmission of the SCI.
- the transmitting terminal 1701 may transmit SCI (1st stage) to the receiving terminal 1702 through a physical sidelink control channel (PSCCH) (1760). Also, the transmitting terminal 1701 may transmit SCI (2nd stage) to the receiving terminal 1702 through the PSSCH (1770). In this case, information related to resource allocation may be included in the 1st stage SCI, and other control information may be included in the 2nd stage SCI. Also, the transmitting terminal 1701 may transmit data to the receiving terminal 1702 through the PSSCH (1780). In this case, SCI (1st stage), SCI (2nd stage), and PSSCH may be transmitted together in the same slot.
- PSSCH physical sidelink control channel
- FIG. 18 is a diagram illustrating an example of a method of directly allocating transmission resources of a sidelink through sensing in a sidelink according to an embodiment of the present disclosure.
- Mode 2 a method in which a UE directly allocates transmission resources of a sidelink through sensing in the sidelink will be referred to as Mode 2.
- Mode 2 it may be referred to as UE autonomous resource selection.
- the base station 1803 provides a sidelink transmission/reception resource pool for V2X as system information, and the transmission terminal 1801 can select transmission resources according to a set rule.
- the transmitting terminal 1801 autonomously selects resources and transmits data based on a resource pool previously received through system information.
- a transmitting terminal 1801 may camp on a base station (cell) 1803 (1805).
- the camp on may mean, for example, a state in which a terminal in a standby state (RRC_IDLE) can select (or reselect) a base station (cell) as needed and receive system information or paging information. there is.
- RRC_IDLE standby state
- the transmitting terminal 1801 in the case of Mode 2, when the transmitting terminal 1801 is located within the coverage of the base station (cell) 1803, the transmitting terminal 1801 is located within the base station (cell) (1803) and camped on May (1807).
- the transmitting terminal 1801 may not camp on the base station (cell) 1803.
- the receiving terminal 1802 when the receiving terminal 1802 is located within the coverage of the base station (cell) 1803, the receiving terminal 1802 may camp on the base station (cell) 1803 (1807). In contrast, when the receiving terminal 1802 is located outside the coverage of the base station (cell) 1803, the receiving terminal 1802 may not camp on the base station (cell) 1803.
- a receiving terminal 1802 represents a terminal receiving data transmitted by a transmitting terminal 1801 .
- the transmitting terminal 1801 and the receiving terminal 1802 may receive a sidelink system information block (SL-SIB) from the base station 1803 (1810).
- the SL-SIB information includes sidelink resource pool information for sidelink transmission and reception, parameter setting information for sensing operation, information for setting sidelink synchronization, or carrier information for sidelink transmission and reception operating in different frequencies. can be included
- FIG. 17 and FIG. 18 The difference between FIG. 17 and FIG. 18 is that in the case of FIG. 17, the base station 1803 and the terminal 1801 operate in an RRC connected state, whereas in FIG. condition) can work. Also, even in the RRC connected state 1820, the base station 1803 may allow the transmitting terminal 1801 to autonomously select transmission resources without directly participating in resource allocation.
- the RRC connection between the terminal 1801 and the base station 1803 may be referred to as Uu-RRC 1820.
- Uu-RRC 1820 the RRC connection between the terminal 1801 and the base station 1803
- the transmitting terminal 1801 receives a resource pool through system information received from the base station 1803, and the transmitting terminal 1801 senses within the set resource pool. It is possible to directly select resources in the time/frequency domain through (1830). When a resource is finally selected, the selected resource is determined as a grant for sidelink transmission.
- the transmitting terminal 1801 may perform transmission without RRC configuration 1815 for the sidelink. Unlike this, in the case of unicast or group cast transmission, the transmitting terminal 1801 may perform a one-to-one RRC connection with another terminal.
- the RRC connection between terminals may be referred to as PC5-RRC 1815, distinguished from Uu-RRC.
- the PC5-RRC 1815 may be individually connected between terminals in the group. Referring to FIG. 18, although the connection of the PC5-RRC 1815 is shown as an operation after the transmission of the SL-SIB (1810), it may be performed at any time before the transmission of the SL-SIB (1810) or before the transmission of the SCI.
- the transmitting terminal 1801 may transmit SCI (1st stage) to the receiving terminal 1802 through the PSCCH (1850).
- the transmitting terminal 1801 may transmit SCI (2nd stage) to the receiving terminal 1802 through the PSSCH (1860).
- information related to resource allocation may be included in the 1st stage SCI, and other control information may be included in the 2nd stage SCI.
- the transmitting terminal 1801 may transmit data to the receiving terminal 1802 through the PSSCH (1870).
- SCI (1st stage), SCI (2nd stage), and PSSCH may be transmitted together in the same slot.
- SCI (1st stage) the type of SCI (Downlink Control Information) used by the transmitting terminals 1701 and 1801 to the receiving terminals 1702 and 1802 for sidelink communication is SCI (1st stage), which is SCI format 1 There may be -A. Also, there may be SCI format 2-A or SCI format 2-B as SCI (2nd stage).
- SCI (2nd stage) SCI format 2-A may include information for PSSCH decoding when HARQ feedback is not used or when HARQ feedback is used and includes both ACK or NACK information.
- SCI format 2-B may include information for PSSCH decoding when HARQ feedback is not used or when HARQ feedback is used and only NACK information is included. For example, SCI format 2-B may be used only for groupcast transmission.
- 19A is a diagram illustrating a mapping structure of sidelink physical channels mapped to one slot according to an embodiment of the present disclosure.
- PSFCH Physical Sidelink Control Channel
- PSSCH Physical Sidelink Shared Channel
- PSFCH Physical Sidelink Feedback Channel
- time-wise resources of PSFCH may be (pre-)configurated with resource pool information.
- a time resource in which the PSFCH is transmitted may be (pre-)configurated with one value among 0, 1, 2, and 4 slots.
- '0' means that the PSFCH resource is not used.
- 1, 2, and 4 may mean that PSFCH resources are transmitted in every 1, 2, and 4 slots, respectively.
- (a) (1920, 1930) shows the structure of slots in which PSFCH resources are not used
- (b) (1940, 1950) shows the structure of slots in which PSFCH resources can be configured and transmitted.
- At least one of PSCCH, PSSCH, and PSFCH may be allocated to one or more subchannels in frequency. For details on subchannel allocation, refer to the description of FIG. 16 .
- mapping on the time axis of at least one of PSCCH, PSSCH, and PSFCH is described.
- One or more symbols before the transmitting terminal transmits at least one of the PSCCH, PSSCH, and PSFCH in the corresponding slot may be used as a region 1901 for Automatic Gain Control (AGC).
- AGC Automatic Gain Control
- Control information related to resource allocation in the first symbols of the slot is transmitted in the PSCCH 1902 as the 1st sidelink control information (SCI), and other control information is transmitted in the resource region 1903 of the PSSCH as the 2nd SCI 1904.
- SCI 1st sidelink control information
- data scheduled by the control information may be transmitted through the PSSCH 1903.
- the 2nd stage SCI may be mapped from a symbol in which the first PSSCH DMRS (1906 or 1907) is transmitted on the time axis.
- the position in time at which the PSSCH DMRS is transmitted may vary according to the PSSCH region allocated to the slot, as shown in (a) 1920 and (b) 1930 .
- 1905 shows an example in which symbols for transmission of signals other than PSSCH are located in the last area of the slot.
- symbols for transmission of signals other than PSSCH are located in the last area of the slot.
- the symbol corresponding to 1905 is used as a gap symbol.
- (b) (1940, 1950) is a case where a plurality of symbols corresponding to 1905 are secured, and the symbol region can be used as a gap symbol, a PSFCH symbol, and a downlink (DL) / uplink (UL) symbol.
- (a-1) (1920) and (b-1) (1940) show an example of a case in which data is transmitted together in the PSSCH region when the 2 nd SCI is transmitted through the PSSCH.
- the number of bits or symbols in which the 2nd SCI is coded using channel coding Can be calculated as in Equation 6 below.
- Symbol index in Equation 6 below may be defined based on symbols used to transmit PSCCH/PSSCH except for the first symbol in a slot used for AGC.
- * represents the number of bits of information included in the 2nd SCI.
- the number of bits of included information may vary depending on the used 2nd SCI format.
- * may be determined using a bit field included in the 1st SCI as a parameter for adjusting the number of coded bits of the 2nd SCI.
- * represents a modulation order used for transmission of 2 nd SCI.
- the corresponding value may be fixed as QPSK.
- * Represents a coding rate used for transmission in 2nd SCI.
- the corresponding value may be determined using a bit field included in 1st SCI, and the coding rate may be the same as the coding rate used for data transmission.
- the number of REs (Resource Elements) used for transmission to the 2nd SCI in can be defined as here is the sibol index Indicates the number of REs in the bandwidth scheduled for PSSCH transmission, is the symbol index Indicates the number of subcarriers used for transmission of PSCCH and PSCCH DMRS, that is, the number of REs.
- * is a value used as a parameter for determining the amount to which 2nd SCI is mapped, and may be set to a higher layer.
- the RE remaining in the RB of the (OFDM or SC-FDMA) symbol to which the last symbol among the (modulated) symbols generated by coding the 2nd SCI is mapped (that is, the RE to which the 2nd SCI is not mapped) ), it is a variable determined so that the 2 nd SCI is mapped to all remaining REs of the corresponding RB.
- 19B illustrates an example of operation of a UE that differently operates a 2nd SCI mapping method according to a case where control information is transmitted along with data and a case where control information is not transmitted through a 2nd SCI according to an embodiment of the present disclosure. It is a drawing
- the terminal when the terminal transmits control information through the 2 nd SCI in step 1910, when the control information is transmitted together with data, the terminal moves to step 1911 and may use 2 nd SCI mapping method 1. Specifically, in method 1 of mapping 2 nd SCI, the number of bits or the number of symbols coded by 2 nd SCI using channel coding is determined according to Equation 6. In contrast, when the terminal transmits control information through the 2 nd SCI in step 1910, if it is not transmitted along with data, the terminal may use 2 nd SCI mapping method 2 in step 1912.
- the 2nd SCI mapping method 1 can be considered as a mapping method for solving the power imbalance problem.
- a large set the value of set the value of to 1 By setting the value of 0 to 0, the 2 nd SCI can be transmitted so as to be mapped to all resource regions of the PSSCH. In this case, power imbalance can be solved.
- the 2nd SCI mapping method for solving power imbalance when data is not transmitted in the PSSCH region is not limited to a specific method.
- the terminal transmits control information through the 2nd SCI when an instruction is given for whether the control information is transmitted together with data or not, the corresponding instruction indicates that the 2nd SCI is mapped to the PSSCH differently.
- control information transmitted through the 2 nd SCI may include information for inter-UE coordination, which is only an example, and in the present invention, information shared for inter-UE coordination is not limited to specific information.
- cooperation information between terminals may be resource allocation related information.
- the terminal may be a vehicle terminal and a pedestrian terminal.
- FIGS. 20a and 20b are diagrams illustrating scenarios for performing inter-UE coordination according to an embodiment of the present disclosure.
- cooperation between terminals may mean providing an enhanced sidelink service by sharing helpful information between terminals.
- Resource allocation related information may be included as such information. For example, when a terminal performing transmission on a sidelink allocates resources through a direct sensing and resource selection procedure (Mode2), or when a terminal performing transmission is within the coverage of a base station (BS), resources are allocated from the base station. can be assigned (Mode1).
- a method in which a terminal receives resource allocation and resource allocation-related information from another terminal through inter-UE coordination may be considered.
- location information of the terminal may be included as cooperation information between terminals.
- information shared for cooperation between terminals is not limited to specific information. More generally, a case in which necessary information between terminals is indicated through 2 nd SCI is considered and this information is referred to as coordination information between terminals.
- FIGS. 20A and 20B a scenario in which inter-UE coordination is performed in a sidelink is shown.
- UE-A (2001) corresponds to a UE that provides UE-B (2002) with inter-UE cooperation information
- UE-B (2002) receives information from UE-A (2001).
- 20A is a diagram showing an example of a case in which UE-A (2001) transmitting cooperation information between devices corresponds to a data receiving terminal for UE-B (2002) receiving cooperation information between devices.
- FIG. 20B is a diagram illustrating an example in which any terminal can become a UE-A (2001) transmitting cooperation information between terminals.
- FIG. 20B a case in which UE-A 2001 is not a reception terminal 2003 for UE-B 2002 is illustrated.
- UE-B can receive inter-UE cooperation information from UE-A and can receive assistance in performing sidelink transmission.
- a terminal providing related information for inter-device cooperation is referred to as UE-A
- a terminal receiving related information for inter-device cooperation is referred to as UE-B.
- a certain UE(s) in the sidelink may be a UE providing cooperation information between UEs, such as UE-A, or a UE receiving cooperation information between UEs, such as UE-B.
- UE-A UE providing cooperation information between UEs
- UE-B UE receiving cooperation information between UEs
- one or more terminals may have qualifications to perform the role of UE-A (or UE-B).
- UE-A (or UE-B) can be selected as needed.
- the role of UE-A (or UE-B) may be performed without performing the role of UE-A (or UE-B), and vice versa.
- the condition that UE-A can provide (or transmit) cooperation information between UEs and cooperation information between UEs presents conditions that can be UE-B.
- at least one of the following conditions may be included as a condition for becoming UE-A.
- the condition of becoming a UE-A providing cooperation information between UEs during cooperation between UEs is not limited to the following conditions.
- a certain terminal has the capability to perform cooperation between terminals.
- the corresponding capability may mean the ability to provide corresponding information to other terminals during cooperation between terminals.
- the terminal may report the corresponding capability to the base station (BS) or other terminals.
- the terminal may perform an operation of reporting the terminal capability of whether cooperation between terminals can be supported to the base station through Uu-RRC or to another terminal through PC5-RRC.
- the base station will be able to determine whether cooperation between the terminals is possible by grasping the capability of the corresponding terminal.
- the terminal may grasp the capabilities of other terminals, determine whether cooperation between terminals with the corresponding terminal is possible, and determine whether to request cooperation information between terminals.
- whether or not cooperation between devices is activated may be set as a higher layer. For example, whether to activate cooperation between terminals may be (pre-)configurated. At this time, (pre-)configuration can be configured for each resource pool.
- the method for determining whether inter-device cooperation is supported is not limited thereto. For example, a method of signaling enable and disable through PC5-RRC, Sidelink MAC-CE, SCI (1 st SCI or 2 nd SCI) may be considered. It is also possible that signaling of activation or inactivation is achieved by a combination of one or more of the above methods.
- a UE is configured to become a UE-A in inter-UE cooperation.
- ** Condition 3 above can be set as a higher layer. For example, whether UE-A may be set through (pre-)configuration. At this time, (pre-)configuration can be configured for each resource pool.
- the method in which the terminal is configured as UE-A is not limited thereto. For example, a method of configuring to play the role of UE-A through PC5-RRC, Sidelink MAC-CE, SCI (1 st SCI or 2 nd SCI) may be considered. It is also possible to be configured to serve as UE-A in a combination of one or more of the above methods.
- the above condition 3 may be a case where a specific terminal is set as a terminal providing cooperation information between terminals in the group cast.
- the corresponding terminal may be a leader terminal of the group.
- a terminal is an intended (data or/and control information) receiving terminal for UE-B.
- Condition 5 It is determined that the reception state in which a UE receives a signal transmitted by UE-B is not good.
- condition 5 when a specific terminal receives a signal transmitted by UE-B and the reception condition is poor, the specific terminal becomes UE-A and can provide cooperation information between terminals to UE-B. Therefore, condition 5 can be applied together with condition 4.
- the reception state of the signal transmitted by the UE-B may be determined to be bad when the error rate of the packet is higher than or exceeds a specific threshold or when continuous packet reception failure occurs.
- the error rate of packets may be a more statistical criterion, and reception failure of consecutive packets may be a case in which X ( ⁇ 1) packets continuously fail to be received.
- failure in reception may mean failure in decoding the PSCCH or PSSCH, and may mean failure in CRC check related to data or control information transmitted on the PSCCH or PSSCH, for example.
- the packet may mean PSCCH or PSSCH or both PSCCH and PSSCH.
- a method for determining that a reception state of a signal for a UE-B is not good by a UE is not limited thereto.
- Condition 6 is due to the fact that more power consumption may occur because UE-A must perform inter-UE cooperation and provide related information to UE-B. Therefore, only the terminal set to full sensing in Mode2 operation can be limited to being UE-A. In other words, a terminal operating in power saving mode in Mode 2 operation may not correspond to condition 6.
- the power saving mode may be set to operate by random selection or partial sensing.
- UE-A can be limited only when the battery level of the UE is higher than the set threshold. In the present invention, the method in which the terminal is configured as UE-A according to the power state is not limited thereto.
- Condition 7 A certain terminal has been triggered to provide information for cooperation between terminals.
- Condition 8 A UE-B and a unicast link have been established.
- Condition 9 It is determined that a UE is within communication range with UE-B.
- UE-A becomes UE-A only when it is determined to be in communication range with UE-B by measuring the distance from UE-B and can provide inter-UE cooperation information to UE-B. This is because when the distance between UE-A and UE-B is greater than the communication range, even if UE-A provides inter-UE cooperation information to UE-B, the corresponding information may not be valid.
- UE-A can calculate the distance based on the zone ID information transmitted by UE-B or the location information of UE-B, and UE-A can calculate the distance transmitted by UE-B (for example, communication It is possible to determine whether to provide inter-device cooperation information based on range requirement information).
- At least one or more of the following conditions may be included as a condition for becoming a UE-B receiving inter-UE cooperation information.
- the conditions for becoming a UE-B during cooperation between UEs are not limited to the following conditions.
- whether or not cooperation between devices is activated (or supported) (enabling/disabling) may be set as a higher layer. For example, whether to activate cooperation between terminals may be (pre-)configurated. At this time, (pre-)configuration can be configured for each resource pool.
- the method for determining whether inter-device cooperation is activated is not limited thereto. For example, a method of signaling enable and disable through PC5-RRC, Sidelink MAC-CE, SCI (1 st SCI or 2 nd SCI) may be considered.
- signaling indicating activation or deactivation may be performed by a combination of one or more of the above methods.
- a UE is configured to become a UE-B in inter-UE cooperation.
- ** Condition 2 above can be set as a higher layer. For example, whether UE-B may be set through (pre-)configuration. At this time, (pre-)configuration can be configured for each resource pool.
- the method in which the terminal is configured as UE-B is not limited thereto. For example, a method of configuring to play the role of UE-B through PC5-RRC, Sidelink MAC-CE, SCI (1 st SCI or 2 nd SCI) may be considered. It may also be made of a combination of one or more of the above methods.
- ** Condition 3 is due to the fact that UE-B, which has received resource allocation information from UE-A through inter-UE cooperation, can reduce power consumption by not performing sensing for resource selection. Therefore, it is possible to limit UE-B to UEs whose Mode2 operation is set to partial sensing or random selection. Alternatively, it may be limited to being a UE-B only when the battery level of the UE is lower than a set threshold. In the present invention, the method in which the UE is configured as UE-B according to the power state is not limited thereto.
- the case where the UE performs sidelink DRX may be considered as a case in which the UE cannot perform sensing or may have an insufficient sensing result. It may be assumed that the UE cannot perform sensing in the DRX inactive period.
- UE-B performs sidelink DRX
- UE-A needs to transmit information for cooperation between UEs (resource allocation information) in the DRX active period of UE-B. This is to ensure that UE-B can successfully receive inter-UE cooperation information provided by UE-A.
- a terminal requests cooperation information between terminals to another terminal.
- 21 illustrates an example of a method in which a terminal requests coordination information between terminals to another terminal through 2 nd SCI or a terminal receiving the same transmits the requested information according to an embodiment of the present disclosure. It is an illustrated drawing.
- the corresponding operation is performed through the 2 nd SCI
- resources to transmit the PSSCH are allocated from the base station or the terminal allocates through direct sensing Actions need to be performed.
- control information including resource allocation information may be indicated through 1 st SCI. More specifically, the fields included in the control information transmitted in 1st SCI are shown in Table 1 below and are named SCI format 1-A.
- 2 nd SCI For of all, there is a 2 nd SCI format defined as SCI format 2-A, and the fields included in it are shown in Table 2 below.
- SCI format 2-B there is a 2 nd SCI format defined as SCI format 2-B, and the fields included in it are shown in Table 3 below.
- SCI format 2-B in Table 3 is an SCI format that can be applied when NACK only feedback is used in a groupcast environment.
- the terminal receiving 2-B measures the distance to the transmitting terminal, and if the distance exceeds the value corresponding to the communication range requirement field included in Table 3, HARQ feedback may not be performed.
- (a) 2110 of FIG. 21 when UE-B 2102 requests inter-UE cooperation information from UE-A 2101 using 2 nd SCI, the request is transmitted along with data in the PSSCH region ( 2103). If, when UE-A (2101) provides UE-B (2102) cooperation information, a method that is not requested by UE-B (2102) but periodically provided at a defined time point is used In this case, the corresponding operation may not be considered.
- (b) 2120 of FIG. 21 when UE-B 2102 requests inter-UE cooperation information from UE-A 2101 using 2 nd SCI, the request is not transmitted along with data in the PSSCH region. Corresponds to (2104). If, when UE-A (2101) provides UE-B (2102) cooperation information, a method that is not requested by UE-B (2102) but periodically provided at a defined time point is used In this case, the corresponding operation may not be considered. For detailed terminal operation of (b) 2120 of FIG. 21, refer to Examples 2-4 below.
- UE-B (2102) when UE-B (2102) requests UE-A (2101) cooperation information through 2 nd SCI, it is transmitted together with data as shown in (a) 2110 of FIG. As shown in (b) 2120 of FIG. 21, when the data is not transmitted, a method for the terminal to indicate this refers to Examples 2-7 below.
- UE-A (2101) provides UE-B (2102) cooperation information through 2nd SCI, it is transmitted together with data as shown in (c) 2130 of FIG. 21 As shown in (d) 2140 of FIG. 21, when the data is not transmitted, the method for the terminal to indicate this is referred to Example 2-7 below.
- a field requesting cooperation information between terminals may be 1 bit and may indicate whether the corresponding information is requested or not.
- the field providing cooperation information between terminals may consist of one or more fields depending on which cooperation information between terminals is indicated, and may include a large number of bits depending on the characteristics of the cooperation information between terminals provided.
- cooperation information between terminals may be resource allocation related information. If the cooperation information between UEs is information related to resource allocation and the information indicates whether or not there is a resource collision detected from the 1 st SCI received by UE-A from UE-B, the field providing cooperation information between UEs is 1 bit, and there is no resource collision. You can also indicate whether it occurs or not.
- the inter-UE cooperation information is resource allocation related information and the corresponding information is resource set information that UE-A prefers or does not prefer for UE-B transmission
- corresponding bits according to the amount of resources included in the resource set. number may vary.
- preferred or non-preferred resource set information is a resource finally selected from candidate resources selected by UE-A through Mode 2 operation, as shown in Table 1, frequency resource assignment, time resource assignment, and Fields such as resource reservation period and the corresponding amount of information can be used to indicate preferred or non-preferred resource set information.
- preferred or non-preferred resource set information indicates all candidate resources selected by UE-A through Mode 2 operation, more bits may be required to indicate this.
- the present invention focuses on a method of requesting or providing cooperation information between terminals using 2nd SCI, but is not limited thereto.
- requesting or providing cooperation information between UEs one or more of the following may be considered as information that may be included in the 2nd SCI.
- a field requesting or providing cooperation information between terminals may be included in one 2 nd SCI format, and a field requesting cooperation information between terminals and a field providing cooperation information between terminals are distinguished, so that they are in different 2 nd SCI formats. Inclusion is also possible.
- fields such as Zone ID and Communication range requirement may be valid information when requesting or providing cooperation information between terminals, so the field requesting or providing cooperation information between terminals is included in one 2 nd SCI format. It can be used even if it is, and it can be used even when the field requesting cooperation information between terminals and the field providing cooperation information between terminals are separated and included in different 2 nd SCI formats.
- inter-device cooperation information it can be composed of one or more fields depending on which type of inter-device cooperation information is indicated, and the amount of information can vary depending on the characteristics of the provided inter-device cooperation information.
- the inter-device cooperation information is resource allocation related information
- it may be included as an information specific field indicating which kind of resource allocation related information it is. For example, whether the cooperation request information between UEs indicates whether or not the resource collision determined by UE-A from the 1st SCI received from UE-B in the first method, or whether UE-A is indicative of UE-B's transmission in the second method. Whether it is preferred or non-preferred resource set information may be indicated.
- the cooperation information between terminals is resource allocation related information
- information indicating whether a collision between expected resources or a previously detected collision may be included as a field.
- information indicating whether the resource set information is preferred or non-preferred resource set information may be included as a field.
- the absolute location of a specific terminal may be included as a field and provided.
- the absolute position may be provided by sampling absolute position information for (x, y, z) coordinates.
- sampling may mean converting an absolute position value for (x, y, z) coordinates into usable bit information for signaling.
- the terminal receiving the corresponding 2 nd SCI can measure an approximate distance from the transmitting terminal using the included Zone ID field.
- information that can be included in the 2nd SCI when requesting or providing inter-device cooperation information is not limited to the information presented above.
- a UE may request inter-UE cooperation information from another UE.
- 2 nd SCI is transmitted together with data in the PSSCH region.
- a field for requesting cooperation information between terminals may indicate whether the information is requested or not with 1 bit. Since the 2nd SCI is transmitted together with data in the PSSCH region, control information for data transmission may be indicated through SCI format 2-A or SCI format 2-B.
- the terminal requesting cooperation information between terminals adds the corresponding field to the existing 2nd SCI format and transmits it, and the terminal receiving it It should be possible to know whether the corresponding field is included in the 2nd SCI and transmitted.
- a terminal requesting cooperation information between terminals may transmit the field by adding the corresponding field to the existing 2 nd SCI format.
- a terminal receiving cooperation information between terminals may determine that a corresponding field is added to the existing 2 nd SCI format and receive the corresponding information.
- cooperation between terminals is enabled as a higher layer may mean a state in which cooperation between terminals is activated through (pre-)configuration.
- the corresponding (pre-)configuration can also be configured in a resource pool.
- a terminal operating in the pool can transmit and receive 2nd SCI by adding cooperation information between terminals to the existing 2nd SCI format.
- enabling inter-device cooperation to a higher layer may mean a state in which inter-device cooperation is activated through PC5-RRC or sidelink MAC-CE. This case can be applied in a sidelink unicast environment, and when cooperation between terminals is activated through this, the terminal can transmit and receive 2nd SCI by adding cooperation information between terminals to the existing 2nd SCI format.
- the UE may request inter-UE cooperation information from other UEs.
- 2nd SCI according to the new 2nd SCI format is transmitted together with data in the PSSCH region.
- a UE requesting inter-UE cooperation information may indicate that a new 2 nd SCI format is used by using the 2 nd stage SCI format field shown in Table 4 below in the 1 st SCI shown in Table 1, and upon receiving the 1 st SCI The terminal will be able to confirm that the new 2 nd SCI format is used from this.
- SCI format 2-C included as '01' in Table 4 is an example of a field used to request cooperation information between terminals with data transmitted together, which may be indicated through '11' and SCI format 2-C It may be defined with a different name.
- the field for requesting cooperation information between terminals included in the 2nd SCI transmits the corresponding information in 1 bit Not only can it be indicated whether it is requested or not, but as shown in Tables 2 and 3, fields included in the existing 2 nd SCI format SCI format 2-A or SCI format 2-B can be included in the new 2 nd SCI format. There will be. However, in the present invention, information that may be included in the new 2 nd SCI format is not limited thereto.
- Embodiment 2-4 when a UE requests inter-UE cooperation information from another UE using 2 nd SCI, when it is not transmitted along with data in the PSSCH region, information included in 2 nd SCI and a method for indicating it Explain. This case is shown in (b) 2120 of FIG. 21 .
- a method of using a new 2 nd SCI format may be considered when the 2 nd SCI is not transmitted together with data in the PSSCH region.
- a UE requesting inter-device cooperation information transmits an inter-device cooperation information request field by adding it to a new 2 nd SCI format, and a UE receiving it can confirm the request for inter-device cooperation information by interpreting the new 2 nd SCI format.
- a UE requesting cooperation information between UEs may indicate that a new 2nd SCI format is used by including the 2nd stage SCI format field shown in Table 5 below in the 1st SCI shown in Table 1, and upon receiving the 1st SCI The UE can confirm that the use of the new 2nd SCI format is indicated from the 1st SCI.
- SCI format 2-C included as '01' in Table 5 is an example of a field used to request cooperation information between terminals without data transmission, which may be indicated through '11', and SCI format 2-C may be defined with a different name.
- a new 2nd SCI format is used by using a field other than the 2nd stage SCI format field among the fields included in the 1st SCI of Table 1. For example, since data is not transmitted, it is also possible to indicate that a new 2nd SCI format is used using the MCS field included in the 1st SCI. In this case, when the MCS field included in the 1st SCI indicates a reserved value on the MCS table, it can be interpreted as indicating that a new 2nd SCI format is used. Alternatively, the MCS field included in the 1st SCI may indicate whether a new 2nd SCI format is used instead of indicating an MCS defined on the existing MCS table.
- Whether the MCS field included in the 1st SCI indicates an MCS for transmitting data defined on the MCS table or whether a new 2nd SCI format is used is determined according to predefined conditions or through higher layer signaling. can be set.
- the MCS field included in 1st SCI is used to indicate whether the new 2nd SCI format is used, whether a specific MCS field value indicates that the new 2nd SCI format is used or the existing 2nd SCI format is used Whether to indicate may be predefined or set through higher layer signaling.
- a 2 nd SCI format indicated by each value of the 2 nd stage SCI format field may be preset.
- the 2nd SCI format indicated by each value of the 2nd stage SCI format field can be (pre-) configured.
- it may be configured through Uu-RRC, PC5-RRC signaling, sidelink MAC CE, and the like.
- terminals requesting cooperation information between terminals and receiving the request may receive the same configuration information for each value of the 2nd stage SCI format field.
- a UE configured to indicate SCI format 2-C sets the 2 nd stage SCI format field included in 1 st SCI to '00' and returns 1 After transmitting st SCI, 2 nd SCI may be transmitted according to SCI format 2-C (without data) on PSSCH.
- a 1-bit field requesting inter-device cooperation information indicates whether or not inter-device cooperation information is requested.
- at least one of the following information may be additionally included in the new 2 nd SCI format.
- the terminal receiving the corresponding 2nd SCI measures the distance to the transmitting terminal using the included Zone ID field, and if the distance exceeds the value corresponding to the Communication range requirement field, the terminal Collaboration information may not be provided. This is a method of determining that the distance between the transmitting and receiving terminals is long and that providing the corresponding information is not valid.
- the amount of information used in the field may be the same as the value shown in Table 3, but is not limited to this value in the present invention. Also note that in the present invention, information that may be included in the new 2 nd SCI format is not limited thereto.
- the fields for data scheduling on the PSSCH of Table 2 or 3 (eg redundancy version, new data indicator, etc.) have a predetermined value (eg '0' , '00') or may not be included in the new 2nd SCI format.
- at least one of a request for cooperation information between terminals or zone ID, communication range requirement, and location information of a terminal may be indicated through a field for data scheduling (instead of adding a field to a new 2 nd SCI format).
- a terminal may provide inter-terminal cooperation information to another terminal.
- 2 nd SCI is transmitted together with data in the PSSCH region.
- a field providing inter-device cooperation information may consist of one or more fields depending on which type of inter-device cooperation information is indicated, and the number of bits included may vary depending on the characteristics of the provided inter-device cooperation information. For more details, refer to Example 2-2. Since the 2nd SCI is transmitted together with data in the PSSCH region, control information for data transmission may be indicated together through SCI format 2-A or SCI format 2-B.
- a terminal providing cooperation information between terminals adds a field indicating cooperation information between terminals to the existing 2nd SCI format and transmits A terminal receiving this must be able to know whether or not the corresponding field has been transmitted.
- a terminal providing cooperation information between terminals may add a corresponding field to the existing 2 nd SCI format and transmit it.
- the terminal receiving cooperation information between terminals may determine that the corresponding field is added to the existing 2 nd SCI format and receive the corresponding information.
- the cooperation between devices is enabled in a higher layer may mean a state in which cooperation between devices is activated through (pre-)configuration.
- the corresponding (pre-)configuration can also be configured in a resource pool.
- a terminal operating in the pool can transmit and receive 2nd SCI by adding cooperation information between terminals to the existing 2nd SCI format.
- enabling inter-device cooperation to a higher layer may mean a state in which inter-device cooperation is activated through PC5-RRC or sidelink MAC-CE. This case can be applied in a sidelink unicast environment, and when cooperation between terminals is activated through this, the terminal can transmit and receive 2nd SCI by adding cooperation information between terminals to the existing 2nd SCI format.
- the UE may provide inter-UE cooperation information to other UEs.
- 2 nd SCI is transmitted together with data in the PSSCH region.
- a UE providing inter-UE cooperation information may indicate that a new 2nd SCI format is used by including a 2nd stage SCI format field shown in Table 6 below in the 1st SCI shown in Table 1, and upon receiving the 1st SCI The UE can confirm that a new 2 nd SCI format is used from the 1 st SCI.
- SCI format 2-C included as '01' in Table 6 is an example of a field used to transmit data together and provide cooperation information between terminals, which may be indicated through '11', and SCI format 2-C It can also be defined with a different name.
- a field for providing cooperation information between terminals is included in the new 2nd SCI format
- fields included in the existing 2 nd SCI format SCI format 2-A or SCI format 2-B may also be included in the new format.
- a field providing inter-device cooperation information may consist of one or more fields depending on which type of inter-device cooperation information is indicated, and the number of bits included may vary depending on the characteristics of the provided inter-device cooperation information. For more details, refer to Example 2-2. However, in the present invention, information that may be included in the new 2 nd SCI format is not limited thereto.
- a terminal providing inter-device cooperation information adds an inter-device cooperation information field to a new 2 nd SCI format and transmits it, and a terminal receiving the same can confirm the inter-device cooperation information by receiving the new 2 nd SCI format.
- a UE providing inter-UE cooperation information may indicate that a new 2 nd SCI format is used by including a 2 nd stage SCI format field shown in Table 7 below in 1 st SCI as shown in Table 1, and upon receiving 1 st SCI The UE will be able to confirm that a new 2nd SCI format is used from the 1st SCI.
- SCI format 2-C included as '01' in Table 7 is an example of a field used to provide cooperation information between terminals without data transmission, which may be indicated through '11', and SCI format 2-C It can also be defined with a different name.
- a new 2nd SCI format is used by using a field other than the 2nd stage SCI format field among the fields included in the 1st SCI of Table 1. For example, since data is not transmitted, it is also possible to indicate that a new 2nd SCI format is used using the MCS field included in the 1st SCI. In this case, when the MCS field included in the 1st SCI indicates a reserved value on the MCS table, it can be interpreted as indicating that a new 2nd SCI format is used. Alternatively, the MCS field included in the 1st SCI may indicate whether a new 2nd SCI format is used instead of indicating an MCS defined on the existing MCS table.
- Whether the MCS field included in the 1st SCI indicates an MCS for transmitting data defined on the MCS table or whether a new 2nd SCI format is used is determined according to predefined conditions or through higher layer signaling. can be set.
- the MCS field included in 1st SCI is used to indicate whether the new 2nd SCI format is used, whether a specific MCS field value indicates that the new 2nd SCI format is used or the existing 2nd SCI format is used Whether to indicate may be predefined or set through higher layer signaling.
- a 2 nd SCI format indicated by each value of the 2 nd stage SCI format field may be preset.
- the 2nd SCI format indicated by each value of the 2nd stage SCI format field can be (pre-)configurated.
- it may be configured through Uu-RRC, PC5-RRC signaling, sidelink MAC CE, and the like.
- terminals that provide cooperation information between terminals and receive the corresponding information may receive the same configuration information for each value of the 2nd stage SCI format field.
- a UE configured to indicate SCI format 2-C sets the 2 nd stage SCI format field included in 1 st SCI to '00' and returns 1 After transmitting st SCI, 2 nd SCI may be transmitted according to SCI format 2-C (without data) on PSSCH.
- the cooperation information field between terminals can be included in the new 2 nd SCI format as well as , the following information may be additionally included.
- the terminal receiving the corresponding 2nd SCI measures the distance to the transmitting terminal using the included Zone ID field, and if the distance exceeds the value corresponding to the Communication range requirement field, the terminal You may not use inter-collaboration information. This is a method of judging that the distance between the transmitting and receiving terminals is long and determining that using the corresponding information is not valid.
- the amount of information used in the corresponding field may be the same as the value shown in Table 3, but is not limited to this value in the present invention.
- a field providing inter-device cooperation information may consist of one or more fields depending on which type of inter-device cooperation information is indicated, and the number of bits included may vary depending on the characteristics of the provided inter-device cooperation information. For more details, refer to Example 2-2. Also, in the present invention, information that may be included in the new 2 nd SCI format is not limited thereto.
- the fields for data scheduling on the PSSCH of Table 2 or 3 (eg redundancy version, new data indicator, etc.) have a predetermined value (eg '0' , '00') or may not be included in the new 2nd SCI format.
- at least one of inter-device cooperation information, zone ID, and communication range requirement may be indicated through the data scheduling field (instead of adding the field to the new 2nd SCI format).
- Embodiment 2-7 when a UE requests inter-UE cooperation information from another UE using 2 nd SCI, a method for the UE to indicate when the 2 nd SCI is transmitted together with data and when it is not transmitted together with data suggest to listen
- a terminal provides inter-terminal cooperation information to another terminal using 2nd SCI
- whether or not 2nd SCI is transmitted together with data in the PSSCH region is indicated by using the 2nd stage SCI format field of 1st SCI.
- a UE providing inter-UE cooperation information may indicate that a new 2 nd SCI format is used by including a 2 nd stage SCI format field shown in Table 8 below in 1 st SCI as shown in Table 1, and upon receiving 1 st SCI The UE will be able to confirm that a new 2nd SCI format is used from the 1st SCI.
- SCI format 2-C included as '01' in Table 8 is an example of a field used to request or provide cooperation information between terminals without data transmission (in Table 5, data is not transmitted to the PSSCH and cooperation information between terminals In the case of a request or when data is not transmitted to the PSSCH in Table 7 and cooperation information is provided between UEs), SCI format 2-D included as '11' in Table 8 indicates that data is transmitted and cooperation information between UEs is requested, or This is an example of a field used to provide (refer to Table 4 when data is transmitted to PSSCH and cooperation information between UEs is requested or when data is transmitted to PSSCH and cooperation information between UEs is provided in Table 6). The order of '10' and '11' of the corresponding field may be indexed by being reversed.
- a field for providing cooperation information between terminals is Not only can it be included in the new 2nd SCI format, but as shown in Tables 2 and 3, the fields included in the existing 2nd SCI format SCI format 2-A or SCI format 2-B can also be included in the new format.
- the field for requesting and providing inter-device cooperation information may consist of one or more fields depending on which type of inter-device cooperation information is indicated, and the characteristics of the provided inter-device cooperation information Depending on , the number of included bits may vary. For more details, refer to Example 2-2. However, in the present invention, information that may be included in the new 2 nd SCI format is not limited thereto.
- each value of the 2nd stage SCI format field may be preset.
- the meaning of each value of the 2nd stage SCI format field can be (pre-)configurated.
- it may be configured through Uu-RRC, PC5-RRC signaling, sidelink MAC CE, and the like.
- UEs that request and provide cooperation information between UEs and receive the corresponding information may receive the same configuration information for each value of the 2nd stage SCI format field.
- a UE configured to indicate that SCI format 2-C is transmitted without data sets the 2nd stage SCI format field included in the 1 st SCI to ' After setting to 00' to transmit 1st SCI, 2nd SCI can be transmitted according to SCI format 2-C without data on PSSCH.
- a method of indicating whether 2 nd SCI is transmitted together with data in the PSSCH region is proposed using a reserved bit of 1st SCI. . Whether or not the 2nd SCI is transmitted together with data in the PSSCH region may be indicated by using 1 bit of the reserved bit. If the corresponding bit indicates that 2nd SCI is transmitted together with data in the PSSCH region, the UE transmits inter-UE cooperation information to another UE using the existing 2nd SCI format SCI format 2-A or SCI format 2-B can be requested or provided.
- the requested or provided field for providing inter-device cooperation information may consist of one or more fields depending on which type of inter-device cooperation information is indicated, and the number of bits included may vary depending on the characteristics of the provided inter-device cooperation information. For more details, refer to Example 2-2. Since the 2nd SCI is transmitted together with data in the PSSCH region, control information for data transmission may be indicated through SCI format 2-A or SCI format 2-B.
- a UE requesting and providing cooperation information between UEs transmits a request for cooperation information between UEs or a cooperation information field between UEs to the existing 2nd SCI format
- a terminal that transmits and receives it must be able to know whether the corresponding field has been transmitted.
- a terminal requesting and providing cooperation information between terminals may transmit a corresponding field by adding it to the existing 2 nd SCI format.
- a terminal receiving a request for cooperation information between terminals or cooperation information between terminals determines that a corresponding field is added to the existing 2 nd SCI format and receives the corresponding information.
- cooperation between terminals is enabled as a higher layer may mean a state in which cooperation between terminals is activated through (pre-)configuration.
- the corresponding (pre-)configuration can also be configured in a resource pool.
- a terminal operating in the pool may transmit and receive a request for cooperation information between terminals or cooperation information between terminals in an existing 2 nd SCI format.
- enabling inter-device cooperation to a higher layer may mean a state in which inter-device cooperation is activated through PC5-RRC or sidelink MAC-CE.
- This case can be applied in a sidelink unicast environment, and when cooperation between terminals is activated through this, the terminal can transmit and receive cooperation information between terminals by adding a request for cooperation information between terminals or cooperation information between terminals to the existing 2 nd SCI format.
- the UE requesting and providing cooperation information between UEs requests cooperation information between UEs or cooperation between UEs
- the information field is included in the new 2 nd SCI format and transmitted, and the UE receiving it can check the request for cooperation information between UEs or the cooperation information between UEs according to the new 2 nd SCI format.
- a UE providing inter-UE cooperation information may indicate that a new 2 nd SCI format is used by including the 2 nd stage SCI format field shown in Table 9 below in the 1 st SCI shown in Table 1, and upon receiving the 1 st SCI The UE may interpret that a new 2 nd SCI format is used from the 1 st SCI.
- SCI format 2-C included as '01' in Table 9 is an example of a field used to request and provide cooperation information between terminals without data being transmitted. It may be defined with a name other than C. Compared to Table 8 in the first method, when the second method is used, as shown in Table 9, '11' can be left in the 2nd stage SCI format field for use of other SCI formats.
- the 2 nd SCI format for requesting cooperation information between terminals and the 2 nd SCI format for providing cooperation information between terminals may be defined as different SCI formats.
- different values of the 2nd-stage SCI format field may indicate that the different SCI formats are used.
- the new 2nd SCI format when requesting and providing inter-device cooperation information through a new 2nd SCI format, if the 2nd SCI is not transmitted along with data in the PSSCH area, the new 2nd SCI format will include the inter-device cooperation information field. In addition, the following information may be additionally included.
- the terminal receiving the corresponding 2nd SCI measures the distance to the transmitting terminal using the included Zone ID field, and if the distance exceeds the value corresponding to the Communication range requirement field, the terminal may or may not provide or use inter-collaboration information. This is a method of determining that the distance between the transmitting and receiving terminals is long and that providing or using the corresponding information is not valid.
- the amount of information used in the corresponding field may be the same as the value shown in Table 3, but is not limited to this value in the present invention.
- a field providing inter-device cooperation information may consist of one or more fields depending on which type of inter-device cooperation information is indicated, and the number of bits included may vary depending on the characteristics of the provided inter-device cooperation information. For more details, refer to Example 2-2. Also, in the present invention, information that may be included in the new 2 nd SCI format is not limited thereto.
- a method of indicating whether 2 nd SCI is transmitted together with data in the PSSCH region by using a field included in 1 st SCI present when requesting or providing inter-device cooperation information through 2 nd SCI, a method of indicating whether 2 nd SCI is transmitted together with data in the PSSCH region by using a field included in 1 st SCI present. For example, whether or not the 2 nd SCI is transmitted together with data in the PSSCH region may be indicated using a reserved value of the MCS field, but the present invention is not limited thereto. If the corresponding value of the MCS field indicates that 2 nd SCI is transmitted together with data in the PSSCH region, the UE uses the existing 2 nd SCI format SCI format 2-A or SCI format 2-B to transfer data between UEs to other UEs. You may request or provide cooperation information. For more details, refer to the second method.
- the UE requesting and providing cooperation information between UEs requests inter-UE cooperation information or transmits a new 2 nd SCI information field. It is included in the nd SCI format and transmitted, and the terminal receiving it can check the cooperation information request between terminals or cooperation information between terminals according to the new 2 nd SCI format. For more details, refer to the second method.
- Embodiments 2-8 propose a method for the terminal to indicate when a positioning reference signal (PRS) is transmitted or not transmitted in the PSSCH region.
- PRS transmission may be considered in a specific time frequency domain in which the PSSCH is transmitted.
- a specific symbol of the PSSCH region may be defined as a symbol through which a PRS is transmitted.
- whether a PRS is transmitted or not transmitted in the PSSCH region may be indicated using a reserved bit of 1st SCI transmitted through PSCCH or other existing fields included in 1st SCI. .
- the 2 nd SCI transmitted in the PSSCH region may be indicated by including information on whether or not the PRS is transmitted in the PSSCH region.
- the existing UE may be instructed to receive the PSSCH by giving an indication through the 1st SCI or 2nd SCI that the PRS is not transmitted in the PSSCH region.
- the UE when transmission of a PRS is required for a UE capable of receiving a PRS, the UE is instructed through 1st SCI or 2nd SCI that the PRS is transmitted in the PSSCH region, and the PSSCH and PRS can be received. will be. However, if the UE is able to receive the PRS but does not need to transmit the PRS, the UE is instructed through the 1 st SCI or 2 nd SCI that the PRS is not transmitted in the PSSCH area, and the PSSCH can be received. .
- FIGS. 22 and 23 a transmitter, a receiver, and a processor of a terminal and a base station are shown in FIGS. 22 and 23, respectively.
- a method for a UE to transmit control information through a 2nd SCI in a sidelink is disclosed, and to perform this, a receiving unit, a processing unit, and a transmitting unit of a base station and a UE must each operate according to an embodiment.
- FIG. 22 is a block diagram illustrating the internal structure of a terminal according to an embodiment of the present invention.
- the terminal of the present invention may include a terminal receiving unit 2200, a terminal transmitting unit 2204, and a terminal processing unit 2202.
- the terminal receiver 2200 and the terminal transmitter 2204 may be collectively referred to as a transceiver in an embodiment of the present invention.
- the transmitting/receiving unit may transmit/receive signals with the base station.
- the signal may include control information and data.
- the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
- the transmitting/receiving unit may receive a signal through a wireless channel, output the signal to the terminal processing unit 2202, and transmit the signal output from the terminal processing unit 2202 through the wireless channel.
- the terminal processing unit 2202 can control a series of processes so that the terminal can operate according to the above-described embodiment of the present invention.
- the base station of the present invention may include a base station receiving unit 2301, a base station transmitting unit 2305, and a base station processing unit 2303.
- the base station receiving unit 2301 and the base station transmitting unit 2305 may collectively be referred to as transceivers in an embodiment of the present invention.
- the transmission/reception unit may transmit/receive signals with the terminal.
- the signal may include control information and data.
- the transceiver unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency.
- the transceiver may receive a signal through a radio channel, output the signal to the base station processor 2303, and transmit the signal output from the base station processor 2303 through a radio channel.
- the base station processing unit 2303 may control a series of processes so that the base station can operate according to the above-described embodiment of the present invention.
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Abstract
Description
Claims (15)
- 통신 시스템의 제1 단말의 방법에 있어서,PSSCH(physical sidelink shared channel) 영역에서 2nd SCI가 데이터와 함께 전송되는지 여부를 확인하는 단계;상기 2nd SCI가 데이터와 함께 전송되는지 여부를 기초로 상기 2nd SCI를 위한 코딩된 변조 심볼의 수를 결정하는 단계;상기 코딩된 변조 심볼의 수를 기초로 상기 2nd SCI를 상기 PSSCH 영역에 매핑하는 단계;상기 PSSCH 영역에 매핑된 2nd SCI를 제2 단말에게 전송하는 단계를 포함하고,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는 상기 2nd SCI가 전송되는 심볼에서 모든 PSSCH 주파수 자원에 상기 2nd SCI가 매핑되도록 결정되는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는, 상기 2nd SCI가 전송되는 마지막 심볼에서 모든 PSSCH 주파수 자원에 상기 2nd SCI가 매핑되도록 정의되는 파라미터를 기초로 결정되는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는,상기 PSSCH 영역의 첫 PSSCH DMRS(demodulation reference signal) 심볼부터 PSSCH의 마지막 심볼까지 상기 2nd SCI가 매핑되도록 결정되거나,상기 PSSCH 영역의 첫 PSSCH DMRS 심볼부터 마지막 PSSCH DMRS 심볼까지 상기 2nd SCI가 매핑되도록 결정되거나, 또는상기 모든 PSSCH 영역에 상기 2nd SCI가 매핑되도록 결정되는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 PSSCH 영역에서 전송되는 2nd SCI는 단말 간 협력 정보(inter-UE coordination)를 요청 또는 상기 단말 간 협력 정보를 제공하기 위한 SCI 포맷에 대응되는 것을 특징으로 하는 방법.
- 제1항에 있어서,PSCCH(physical sidelink control channel) 영역에서 1st SCI를 상기 제2 단말에게 전송하는 단계를 더 포함하고,상기 1st SCI는 상기 PSSCH 영역에서 상기 2nd SCI가 데이터와 함께 전송되는지 여부를 나타내기 위한 정보 필드를 포함하는 것을 특징으로 하는 방법.
- 통신 시스템의 제2 단말의 방법에 있어서,PSSCH(physical sidelink shared channel) 영역에서 2nd SCI가 데이터와 함께 전송되는지 여부를 확인하는 단계;상기 2nd SCI가 데이터와 함께 전송되는지 여부에 따라 결정되는 코딩된 변조 심볼의 수를 기초로 상기 PSSCH 영역에 매핑된 2nd SCI를 제1 단말로부터 수신하는 단계를 포함하고상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는 상기 2nd SCI가 전송되는 심볼에서 모든 PSSCH 주파수 자원에 상기 2nd SCI가 매핑되도록 결정되는 것을 특징으로 하는 방법.
- 제6항에 있어서,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는, 상기 2nd SCI가 전송되는 마지막 심볼에서 모든 PSSCH 주파수 자원에 상기 2nd SCI가 매핑되도록 정의되는 파라미터를 기초로 결정되는 것을 특징으로 하는 방법.
- 제6항에 있어서,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는,상기 PSSCH 영역의 첫 PSSCH DMRS(demodulation reference signal) 심볼부터 PSSCH의 마지막 심볼까지 상기 2nd SCI가 매핑되도록 결정되거나,상기 PSSCH 영역의 첫 PSSCH DMRS 심볼부터 마지막 PSSCH DMRS 심볼까지 상기 2nd SCI가 매핑되도록 결정되거나, 또는상기 모든 PSSCH 영역에 상기 2nd SCI가 매핑되도록 결정되는 것을 특징으로 하는 방법.
- 제6항에 있어서,상기 PSSCH 영역에서 전송되는 2nd SCI는 단말 간 협력 정보(inter-UE coordination)를 요청 또는 상기 단말 간 협력 정보를 제공하기 위한 SCI 포맷에 대응되는 것을 특징으로 하는 방법.
- 제6항에 있어서,PSCCH(physical sidelink control channel) 영역에서 1st SCI를 상기 제1 단말로부터 수신하는 단계를 더 포함하고,상기 1st SCI는 상기 PSSCH 영역에서 상기 2nd SCI가 데이터와 함께 전송되는지 여부를 나타내기 위한 정보 필드를 포함하는 것을 특징으로 하는 방법.
- 통신 시스템의 제1 단말에 있어서,송수신부; 및PSSCH(physical sidelink shared channel) 영역에서 2nd SCI가 데이터와 함께 전송되는지 여부를 확인하고,상기 2nd SCI가 데이터와 함께 전송되는지 여부를 기초로 상기 2nd SCI를 위한 코딩된 변조 심볼의 수를 결정하고,상기 코딩된 변조 심볼의 수를 기초로 상기 2nd SCI를 상기 PSSCH 영역에 매핑하고,상기 PSSCH 영역에 매핑된 2nd SCI를 제2 단말에게 전송하도록 구성되는 제어부를 포함하고,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는 상기 2nd SCI가 전송되는 심볼에서 모든 PSSCH 주파수 자원에 상기 2nd SCI가 매핑되도록 결정되는 것을 특징으로 하는 제1 단말.
- 제11항에 있어서,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는, 상기 2nd SCI가 전송되는 마지막 심볼에서 모든 PSSCH 주파수 자원에 상기 2nd SCI가 매핑되도록 정의되는 파라미터를 기초로 결정되는 것을 특징으로 하는 제1 단말.
- 제11항에 있어서,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는,상기 PSSCH 영역의 첫 PSSCH DMRS(demodulation reference signal) 심볼부터 PSSCH의 마지막 심볼까지 상기 2nd SCI가 매핑되도록 결정되거나,상기 PSSCH 영역의 첫 PSSCH DMRS 심볼부터 마지막 PSSCH DMRS 심볼까지 상기 2nd SCI가 매핑되도록 결정되거나, 또는상기 모든 PSSCH 영역에 상기 2nd SCI가 매핑되도록 결정되는 것을 특징으로 하는 제1 단말.
- 제11항에 있어서,상기 PSSCH 영역에서 전송되는 2nd SCI는 단말 간 협력 정보(inter-UE coordination)를 요청 또는 상기 단말 간 협력 정보를 제공하기 위한 SCI 포맷에 대응되는 것을 특징으로 하는 제1 단말.
- 통신 시스템의 제2 단말에 있어서,송수신부; 및PSSCH(physical sidelink shared channel) 영역에서 2nd SCI가 데이터와 함께 전송되는지 여부를 확인하고, 상기 2nd SCI가 데이터와 함께 전송되는지 여부에 따라 결정되는 코딩된 변조 심볼의 수를 기초로 상기 PSSCH 영역에 매핑된 2nd SCI를 제1 단말로부터 수신하도록 구성되는 제어부를 포함하고,상기 2nd SCI가 데이터와 함께 전송되지 않는 경우, 상기 2nd SCI를 위한 코딩된 변조 심볼의 수는 상기 2nd SCI가 전송되는 심볼에서 모든 PSSCH 주파수 자원에 상기 2nd SCI가 매핑되도록 결정되는 것을 특징으로 하는 제2 단말.
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WO2021066451A1 (ko) * | 2019-10-04 | 2021-04-08 | 엘지전자 주식회사 | 무선통신시스템에서 2nd stage SCI 관련 UE의 동작 방법 |
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