WO2016159715A2 - 무선 통신 시스템에서 v2x 단말이 신호를 송수신 하는 방법 및 장치 - Google Patents
무선 통신 시스템에서 v2x 단말이 신호를 송수신 하는 방법 및 장치 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0226—Traffic management, e.g. flow control or congestion control based on location or mobility
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/012—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from other sources than vehicle or roadside beacons, e.g. mobile networks
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/056—Detecting movement of traffic to be counted or controlled with provision for distinguishing direction of travel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
- H04W4/026—Services making use of location information using location based information parameters using orientation information, e.g. compass
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
Definitions
- the following description relates to a wireless communication system, and more particularly, to a method and apparatus for a terminal to transmit and receive a vehicle to everything (V2X) related signal.
- V2X vehicle to everything
- Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA).
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- MCD division multiple access
- MCDMA multi-carrier frequency division multiple access
- MC-FDMA multi-carrier frequency division multiple access
- D2D communication establishes a direct link between user equipments (UEs), and directly communicates voice and data between terminals without passing through an evolved NodeB (eNB).
- UEs user equipments
- eNB evolved NodeB
- the D2D communication may include a scheme such as UE-to-UE communication, Peer-to-Peer communication, and the like.
- the D2D communication scheme may be applied to machine-to-machine (M2M) communication, machine type communication (MTC), and the like.
- M2M machine-to-machine
- MTC machine type communication
- D2D communication has been considered as a way to solve the burden on the base station due to the rapidly increasing data traffic.
- the D2D communication unlike the conventional wireless communication system, since the data is exchanged between devices without passing through a base station, the network can be overloaded.
- the D2D communication it is possible to expect the effect of reducing the procedure of the base station, the power consumption of the devices participating in the D2D, increase the data transmission speed, increase the capacity of the network, load balancing, cell coverage expansion.
- a signal transmission / reception method for transmitting data after selecting a resource pool in consideration of location information of a V2X terminal is a technical problem.
- a method of transmitting and receiving a signal related to a vehicle to everything (V2X) in a wireless communication system comprising: selecting a resource pool by comparing one or more measurement information and a resource pool parameter; And transmitting data using the resource pool, wherein the at least one measurement information relates to a geographical location of the terminal.
- V2X vehicle to everything
- a terminal device for transmitting and receiving V2X (ehicle to everything) related signals in a wireless communication system, comprising: a transmitting device and a receiving device; And a processor, wherein the processor compares one or more measurement information with a resource pool parameter to select a resource pool and transmits data using the resource pool, wherein the one or more measurement information is stored in a geographical location of the terminal. It is related, and a terminal apparatus.
- V2X vehicle to everything
- the resource pool may be configured with a range of values for each parameter related to the geographical location of the terminal.
- One or more of a transmission period, a transmission probability, and a repetition number may be configured in the resource pool.
- the one or more measurement information may include the movement direction information of the terminal.
- the movement direction information of the terminal may be measured by a sensor of the terminal or a global positioning system (GPS).
- GPS global positioning system
- the movement direction information of the terminal may be derived from a cell ID change.
- the cell ID may be identifier information for identifying a road side unit (RSU).
- RSU road side unit
- the one or more pieces of measurement information may be an average value of a moving speed of a neighboring terminal of the terminal.
- the one or more measurement information may include the mobility (mobility) of the terminal.
- the mobility may be measured by the speed sensor of the terminal.
- the mobility may be determined according to the number of times the RSRP discovers an RSU that is greater than or equal to a preset value.
- the terminal may transmit the data on a preset time-frequency resource of the resource pool.
- the terminal may select a time-frequency resource from the resource pool and transmit the data.
- ICI can be reduced by classifying resource regions according to a moving direction or mobility of a terminal.
- 1 is a diagram illustrating a structure of a radio frame.
- FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
- 3 is a diagram illustrating a structure of a downlink subframe.
- FIG. 4 is a diagram illustrating a structure of an uplink subframe.
- FIG. 5 is a configuration diagram of a wireless communication system having multiple antennas.
- FIG. 6 shows a subframe in which the D2D synchronization signal is transmitted.
- FIG. 7 is a diagram for explaining a relay of a D2D signal.
- FIG. 8 shows an example of a D2D resource pool for D2D communication.
- FIG. 12 is a diagram illustrating a configuration of a transmitting and receiving device.
- each component or feature may be considered to be optional unless otherwise stated.
- Each component or feature may be embodied in a form that is not combined with other components or features.
- some components and / or features may be combined to form an embodiment of the present invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
- the base station has a meaning as a terminal node of the network that directly communicates with the terminal.
- the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
- a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like.
- the repeater may be replaced by terms such as relay node (RN) and relay station (RS).
- the term “terminal” may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), a subscriber station (SS), and the like.
- a base station may also be used as a meaning of a scheduling node or a cluster header. If the base station or the relay also transmits a signal transmitted by the terminal, it can be regarded as a kind of terminal.
- the cell names described below are applied to transmission and reception points such as a base station (eNB), a sector, a remote radio head (RRH), a relay, and the like. It may be used as a generic term for identifying a component carrier.
- eNB base station
- RRH remote radio head
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced
- WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system). For clarity, the following description focuses on 3GPP LTE and 3GPP LTE-A systems, but the technical spirit of the present invention is not limited thereto.
- a structure of a radio frame will be described with reference to FIG. 1.
- uplink / downlink data packet transmission is performed in units of subframes, and one subframe is defined as a predetermined time interval including a plurality of OFDM symbols.
- the 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
- the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
- the time it takes for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- RBs resource blocks
- a resource block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one block.
- the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
- CP has an extended CP (normal CP) and a normal CP (normal CP).
- normal CP normal CP
- the number of OFDM symbols included in one slot may be seven.
- the OFDM symbol is configured by an extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP.
- the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the terminal moves at a high speed, an extended CP may be used to further reduce intersymbol interference.
- one subframe includes 14 OFDM symbols.
- the first two or three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
- PDCCH physical downlink control channel
- PDSCH physical downlink shared channel
- Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS downlink pilot time slot
- GP guard period
- UpPTS uplink pilot time slot
- One subframe consists of two slots.
- DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- one subframe consists of two slots regardless of the radio frame type.
- the structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.
- FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
- One downlink slot includes seven OFDM symbols in the time domain and one resource block (RB) is shown to include 12 subcarriers in the frequency domain, but the present invention is not limited thereto.
- one slot includes 7 OFDM symbols in the case of a general cyclic prefix (CP), but one slot may include 6 OFDM symbols in the case of an extended-CP (CP).
- Each element on the resource grid is called a resource element.
- One resource block includes 12 ⁇ 7 resource elements.
- the number N DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
- the structure of the uplink slot may be the same as the structure of the downlink slot.
- FIG. 3 is a diagram illustrating a structure of a downlink subframe.
- Up to three OFDM symbols at the front of the first slot in one subframe correspond to a control region to which a control channel is allocated.
- the remaining OFDM symbols correspond to data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated.
- Downlink control channels used in the 3GPP LTE / LTE-A system include, for example, a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH).
- PCFICH Physical Control Format Indicator Channel
- PDCH Physical Downlink Control Channel
- PHICH Physical Hybrid Automatic Repeat Request Indicator Channel
- the PHICH includes a HARQ ACK / NACK signal as a response of uplink transmission.
- Control information transmitted through the PDCCH is referred to as downlink control information (DCI).
- the DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
- the PDCCH is a resource allocation and transmission format of the downlink shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information of the paging channel (PCH), system information on the DL-SCH, on the PDSCH Resource allocation of upper layer control messages such as random access responses transmitted to the network, a set of transmit power control commands for individual terminals in an arbitrary terminal group, transmission power control information, and activation of voice over IP (VoIP) And the like.
- a plurality of PDCCHs may be transmitted in the control region.
- the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted in an aggregation of one or more consecutive Control Channel Elements (CCEs).
- CCEs Control Channel Elements
- CCE is a logical allocation unit used to provide a PDCCH at a coding rate based on the state of a radio channel.
- the CCE corresponds to a plurality of resource element groups.
- the number of CCEs required for the PDCCH may vary depending on the size and coding rate of the DCI. For example, any one of 1, 2, 4, and 8 CCEs (corresponding to PDCCH formats 0, 1, 2, and 3, respectively) may be used for PDCCH transmission, and when the size of DCI is large and / or channel state If a low coding rate is required due to poor quality, a relatively large number of CCEs may be used for one PDCCH transmission.
- the base station determines the PDCCH format in consideration of the size of the DCI transmitted to the terminal, the cell bandwidth, the number of downlink antenna ports, the PHICH resource amount, and adds a cyclic redundancy check (CRC) to the control information.
- the CRC is masked with an identifier called a Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH.
- RNTI Radio Network Temporary Identifier
- the PDCCH is for a specific terminal, the cell-RNTI (C-RNTI) identifier of the terminal may be masked to the CRC.
- a paging indicator identifier P-RNTI
- SI-RNTI system information identifier and system information RNTI
- RA-RNTI Random Access-RNTI
- the uplink subframe may be divided into a control region and a data region in the frequency domain.
- a physical uplink control channel (PUCCH) including uplink control information is allocated to the control region.
- a physical uplink shared channel (PUSCH) including user data is allocated.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- one UE does not simultaneously transmit a PUCCH and a PUSCH.
- PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called a resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- the transmitted packet is transmitted through a wireless channel
- signal distortion may occur during the transmission process.
- the distortion In order to correctly receive the distorted signal at the receiving end, the distortion must be corrected in the received signal using the channel information.
- a method of transmitting the signal known to both the transmitting side and the receiving side and finding the channel information with the distortion degree when the signal is received through the channel is mainly used.
- the signal is called a pilot signal or a reference signal.
- the reference signal may be divided into an uplink reference signal and a downlink reference signal.
- an uplink reference signal as an uplink reference signal,
- DM-RS Demodulation-Reference Signal
- SRS sounding reference signal
- DM-RS Demodulation-Reference Signal
- CSI-RS Channel State Information Reference Signal
- MBSFN Multimedia Broadcast Single Frequency Network
- Reference signals can be classified into two types according to their purpose. There is a reference signal for obtaining channel information and a reference signal used for data demodulation. Since the former has a purpose for the UE to acquire channel information on the downlink, the UE should be transmitted over a wide band, and the UE should receive the reference signal even if the UE does not receive the downlink data in a specific subframe. It is also used in situations such as handover.
- the latter is a reference signal transmitted together with a corresponding resource when the base station transmits a downlink, and the terminal can demodulate data by performing channel measurement by receiving the reference signal. This reference signal should be transmitted in the area where data is transmitted.
- FIG. 5 is a configuration diagram of a wireless communication system having multiple antennas.
- the transmission rate can be improved and the frequency efficiency can be significantly improved.
- the transmission rate may theoretically increase as the rate of increase rate Ri multiplied by the maximum transmission rate Ro when using a single antenna.
- a transmission rate four times higher than a single antenna system may be theoretically obtained. Since the theoretical capacity increase of multi-antenna systems was proved in the mid 90's, various techniques to actively lead to the actual data rate improvement have been actively studied. In addition, some technologies are already being reflected in various wireless communication standards such as 3G mobile communication and next generation WLAN.
- the research trends related to multi-antennas to date include the study of information theory aspects related to the calculation of multi-antenna communication capacity in various channel environments and multi-access environments, the study of wireless channel measurement and model derivation of multi-antenna systems, improvement of transmission reliability, and improvement of transmission rate. Research is being actively conducted from various viewpoints, such as research on space-time signal processing technology.
- the communication method in a multi-antenna system will be described in more detail using mathematical modeling. It is assumed that there are Nt transmit antennas and Nt receive antennas in the system.
- the transmission signal when there are Nt transmit antennas, the maximum information that can be transmitted is NT.
- the transmission information may be expressed as follows.
- Each transmission information The transmit power may be different.
- Each transmit power In this case, the transmission information whose transmission power is adjusted may be expressed as follows.
- Weighting matrix Nt transmitted signals actually applied by applying Consider the case where is configured.
- Weighting matrix Plays a role in properly distributing transmission information to each antenna according to a transmission channel situation.
- Vector It can be expressed as follows.
- Received signal is received signal of each antenna when there are Nr receiving antennas Can be expressed as a vector as
- channels may be divided according to transmit / receive antenna indexes. From the transmit antenna j to the channel through the receive antenna i It is indicated by. Note that in the order of the index, the receiving antenna index is first, and the index of the transmitting antenna is later.
- FIG. 5 (b) shows a channel from NR transmit antennas to receive antenna i .
- the channels may be bundled and displayed in vector and matrix form.
- a channel arriving from a total of NT transmit antennas to a receive antenna i may be represented as follows.
- AWGN Additive White Gaussian Noise
- the received signal may be expressed as follows through the above-described mathematical modeling.
- the channel matrix indicating the channel state The number of rows and columns of is determined by the number of transmit and receive antennas.
- Channel matrix The number of rows is equal to the number of receiving antennas NR, and the number of columns is equal to the number of transmitting antennas Nt. That is, the channel matrix The matrix is NR ⁇ Nt.
- the rank of a matrix is defined as the minimum number of rows or columns that are independent of each other. Thus, the rank of the matrix cannot be greater than the number of rows or columns.
- Channel matrix Rank of ( ) Is limited to
- rank may be defined as the number of nonzero eigenvalues when the matrix is eigenvalue decomposition.
- another definition of rank may be defined as the number of nonzero singular values when singular value decomposition is performed.
- rank in the channel matrix The physical meaning of is the maximum number of different information that can be sent on a given channel.
- 'rank' for MIMO transmission refers to the number of paths that can independently transmit signals at specific time points and specific frequency resources, and 'number of layers' denotes each path. It indicates the number of signal streams transmitted through the system. In general, since the transmitting end transmits the number of layers corresponding to the number of ranks used for signal transmission, unless otherwise specified, the rank has the same meaning as the number of layers.
- some nodes may transmit a D2D signal (where the node may be referred to as an eNB, a UE, a synchronization reference node or a synchronization source), and transmit a D2D synchronization signal (D2DSS, D2D Synchronization Signal).
- a method of transmitting and receiving signals in synchronization with the remaining terminals may be used.
- the D2D synchronization signal may be a primary synchronization signal (Primary D2DSS or Primary Sidelink synchronization signal (PSSS)) or a secondary synchronization signal (SD2DSS (Secondary D2DSS or Secondary Sidelink synchronization signal)). It may be a Zadoff-chu sequence or a similar / modified / repeated structure to the PSS, etc. It is also possible to use other Zadoff Chu root indices (eg, 26, 37) unlike the DL PSS. May be a similar / modified / repeated structure to M-sequence or SSS, etc.
- PD2DSS Physical D2D synchronization channel
- SRN becomes eNB
- D2DSS becomes PSS / SSS
- PD2DSS The / SD2DSS follows the UL subcarrier mapping scheme, and the subframe through which the D2D synchronization signal is transmitted is shown in Fig. 6.
- the PD2DSCH Physical D2D synchronization channel
- the PD2DSCH may be transmitted on the same subframe as the D2DSS or on a subsequent subframe DMRS may be used for demodulation of the PD2DSCH.
- the SRN may be a node transmitting a D2DSS and a Physical D2D Synchronization Channel (PD2DSCH).
- the D2DSS may be in the form of a specific sequence
- the PD2DSCH may be in the form of a sequence representing specific information or a code word after a predetermined channel coding.
- the SRN may be an eNB or a specific D2D terminal.
- the UE may be an SRN.
- the D2DSS may be relayed for D2D communication with an out of coverage terminal.
- the D2DSS can be relayed over multiple hops.
- relaying a synchronization signal is a concept including not only directly relaying a synchronization signal of a base station, but also transmitting a D2D synchronization signal of a separate format in accordance with the timing of receiving the synchronization signal. As such, since the D2D synchronization signal is relayed, the in-coverage terminal and the out-of-coverage terminal can directly perform communication.
- a UE refers to a network equipment such as a base station for transmitting and receiving a signal according to a terminal or a D2D communication scheme.
- the terminal may select a resource unit corresponding to a specific resource in a resource pool representing a set of resources and transmit a D2D signal using the corresponding resource unit.
- the receiving terminal UE2 may be configured with a resource pool in which UE1 can transmit a signal, and detect a signal of UE1 in the corresponding pool.
- the resource pool may be notified by the base station when UE1 is in the connection range of the base station.
- a resource pool is composed of a plurality of resource units, each terminal may select one or a plurality of resource units and use them for transmitting their D2D signals.
- the resource unit may be as illustrated in FIG. 8 (b). Referring to FIG. 8 (b), it can be seen that total frequency resources are divided into NFs and total time resources are divided into NTs so that a total of NF * NT resource units are defined.
- the resource pool may be repeated every NT subframe. In particular, one resource unit may appear periodically and repeatedly as shown.
- a resource pool may mean a set of resource units that can be used for transmission by a terminal that wants to transmit a D2D signal.
- Resource pools can be divided into several types. First, they may be classified according to contents of D2D signals transmitted from each resource pool. For example, the contents of the D2D signal may be divided, and a separate resource pool may be configured for each.
- As the content of the D2D signal there may be a scheduling assignment (SA), a D2D data channel, and a discovery channel (SA), where the location of a resource used for transmission of a subsequent D2D data channel by a transmitting terminal and others It may be a signal including information such as a modulation and coding scheme (MCS), a MIMO transmission scheme, a timing advance (TA), etc. required for demodulation of a data channel, which may be multiplexed and transmitted together with D2D data on the same resource unit.
- MCS modulation and coding scheme
- TA timing advance
- the SA resource pool may mean a pool of resources in which the SA is multiplexed with the D2D data and transmitted, or may be referred to as a D2D control channel or a physical sidelink control channel (PSCCH).
- the D2D data channel (or physical sidelink shared channel (PSSCH)) may be a pool of resources used by a transmitting terminal to transmit user data. If the SA is multiplexed and transmitted together with the D2D data on the same resource unit, only the D2D data channel except for the SA information may be transmitted in the resource pool for the D2D data channel, that is, individual resource units in the SA resource pool.
- the REs used to transmit SA information on the D2D data channel resource pool can still be used to transmit D2D data in the discovery channel, where a transmitting terminal transmits information such as its own ID and the like so that a neighboring terminal can discover itself. It can be a resource pool for messages to be made.
- the transmission timing determination method of the D2D signal for example, is it transmitted at the time of reception of a synchronization reference signal or is transmitted by applying a constant TA there
- a resource allocation method for example, For example, whether an eNB assigns transmission resources of an individual signal to an individual transmitting UE or whether an individual transmitting UE selects an individual signaling resource on its own in a pool, and a signal format (for example, each D2D signal occupies one subframe).
- the number of symbols, the number of subframes used for transmission of one D2D signal), the signal strength from the eNB, and the transmission power strength of the D2D UE may be further divided into different resource pools.
- Mode 1 a transmission resource region is set in advance, or the eNB designates a transmission resource region, and the UE directly selects a transmission resource in a method of directly instructing the eNB to transmit resources of the D2D transmitting UE in D2D communication.
- Mode 2 In the case of D2D discovery, when the eNB directly indicates a resource, a type 2 when a UE directly selects a transmission resource in a preset resource region or a resource region indicated by the eNB is called Type 1.
- the mode 1 terminal may transmit an SA (or a D2D control signal, Sidelink Control Information (SCI)) through a resource configured from the base station.
- SA or a D2D control signal, Sidelink Control Information (SCI)
- SCI Sidelink Control Information
- the mode 2 terminal is configured with a resource to be used for D2D transmission from the base station.
- the SA may be transmitted by selecting a time frequency resource from the configured resource.
- the first SA period may be started in a subframe away from a specific system frame by a predetermined offset SAOffsetIndicator indicated by higher layer signaling.
- Each SA period may include a SA resource pool and a subframe pool for D2D data transmission.
- the SA resource pool may include the last subframe of the subframes indicated by which the SA is transmitted in the subframe bitmap (saSubframeBitmap) from the first subframe of the SA period.
- a sub-frame used for actual data transmission may be determined by applying time-resource pattern for transmission (T-RPT).
- the T-RPT may be repeatedly applied, and the last applied T-RPT is the number of remaining subframes. As many as truncated can be applied.
- the SA may indicate the transmission location of the data in the form of T-RPT or in another explicit way. For example, it may be in the form of indicating the transmission start position of the data, the number of repetitions and the like. More generally, SA is a channel indicating time and frequency positions of data transmission resources and including additional information necessary for data decoding.
- the SA resource pool may be separated from the data pool, but may be partially overlapped with the data pool to use some data areas together. In addition, the data pool and the SA resource pool may not be separated in the time domain but may be separated in the frequency domain.
- V2X is a concept including V2V between vehicle terminals, V2P between a vehicle and other types of terminals, and V2I communication between a vehicle and a roadside unit (RSU).
- RSU roadside unit
- the terminal may be a vehicle or a UE attached to the vehicle.
- a terminal may compare a resource pool parameter with one or more measurement information, select a resource pool, and transmit data using the resource pool.
- the terminal may transmit data on a preset time-frequency resource of the resource pool, or select a time-frequency resource from the resource pool and transmit the data.
- the one or more measurement information may be related to the geographic location of the terminal.
- the terminal selects a resource pool from a plurality of resource pool (s), but a range of values may be configured in the resource pool (s) for each parameter related to the geographical location of the terminal.
- the terminal may select a resource pool that matches the condition by comparing the measurement information related to the geographical location with a range of parameter values configured in the resource pool.
- at least one of a transmission period, a transmission probability, and a repetition number may be configured in the resource pool.
- transmission may be performed according to a transmission period, a transmission probability, a repetition number, and the like configured in the resource pool.
- the transmission period, the transmission probability, the number of repetitions, and the like may be forced by the terminal when the resource pool is selected or recommended (depending on the terminal's selection).
- the one or more measurement information may include the movement direction information of the terminal.
- the resource pool may be configured in advance for each moving direction.
- the resource pool may be configured in advance for each moving direction.
- the resource pool may be configured in advance for each moving direction.
- the resource pool may be configured in advance for each moving direction.
- the resource pool may be configured in advance for each moving direction.
- the movement direction information of the terminal since the movement direction information of the terminal is two kinds, at least two kinds of resource pools may be configured according to the direction.
- a threshold of a heading value may be configured in the resource pool. If there is one resource pool for each direction, as illustrated in FIG. 10, a terminal having the same moving direction (that is, running in the same direction) uses the same resource (resource pool A), and a terminal running in a different direction is used. And other resource pools (resource pool B).
- the resource pools are illustrated as being divided on the time axis, but this is only an example and each resource pool may be divided on the frequency axis or on the time-frequency
- the movement direction information of the terminal may be measured by a sensor of the terminal or a global positioning system (GPS).
- GPS global positioning system
- the acquisition / measurement method of the movement direction information is not necessarily limited thereto, and various methods for obtaining a heading value may be used.
- the traveling direction of the terminal can be known in any manner, the resource regions may be distinguished between terminals having different traveling directions by using values for the traveling directions.
- the resources may be separated in three ways, time, frequency, time / frequency, the embodiment of the present invention includes all three cases.
- the heading value may be implicitly identified by tracking the ID of the neighboring cell or the RSU. That is, the movement direction information of the terminal may be derived from a cell ID change, where the cell ID may be identifier information for distinguishing a road side unit (RSU).
- RSU road side unit
- the UE does not know the heading value or the heading value is not directly used for resource selection, when the UE performs handover between cells (handover for RRC connected UE and cell reselection for RRC idle UE).
- By tracking the change of the cell ID it is possible to set different resource pools between terminals having different tendency to change the cell ID, that is, terminals moving in different directions.
- the network may configure the resource range of the variation range of the sequence or vector or the equivalent information generated by the change of the cell ID or the change of the cell ID when the terminal moves. For example, a resource pool used by a terminal whose cell ID is changed from A-> B-> C and a resource pool used by a terminal whose C-> B-> A is changed in a specific region may be distinguished / separated. . To this end, the network uses a vector between cell ID variation values, differences, and cell IDs so that UEs can distinguish between a resource pool used when the detected cell ID changes from C-> A and a resource pool used when changing from A-> C. A range of values can be configured for each resource pool. As another example, the network may configure, for each resource pool, an order in which the cell ID is detected to be above a certain threshold within a predetermined time.
- the terminal may track the ID of the detected RSU to estimate the mobility and direction of the terminal.
- the network may signal the change of the ID of the RSU for each resource pool.
- the UE moving a particular road may report the detected cell ID order or RSU ID order as a physical layer or a higher layer signal to the network (or separately) together with the heading value or the heading direction of the road. This is for the network to estimate the cell ID / RSU ID variation statistics according to the heading value on a particular road.
- the network may configure a change value of the cell ID / RSU ID for each resource pool based on the information fed back from the terminal.
- the heading value or range can be directly configured for each resource pool, several resource pools are simply configured, and the network can configure the usage index of the resource pool according to the heading.
- the terminal also selects a usage index according to the heading value and proposes a method in which the terminal selects a resource pool according to the selected usage index.
- the heading value is not used explicitly for resource pool selection, but is replaced by the use index for each resource pool, and implicitly classifies the resource pool according to the heading value.
- the relative speed between the terminals may be reduced, thereby reducing intercarrier interference (ICI) for mobility.
- required services may differ depending on whether the progress direction is the same in V2X, and it can support this. For example, when the road is clearly divided into guardrails and tunnels, and the information of the other lane is not important, decoding of information transmitted by the terminal of the other lane may be omitted.
- vehicle congestion may occur only in a specific direction, or the number of terminals may increase rapidly due to traffic congestion in the opposite direction, which may also be solved. If the shared pool is used regardless of the direction, the D2D signal transmission and reception in a specific direction may not occur smoothly due to congestion in another direction.
- the one or more measurement information may include mobility of the terminal. That is, the resource pool may be classified according to the mobility of the terminal.
- the network may be configured with an upper limit value and a lower limit value or an average value of mobility for each resource pool.
- the UE can transmit its signal only from the resource pool that satisfies the mobility conditions configured by the network by identifying its mobility. In this case, it is possible to classify the resource region between a terminal with low mobility and a terminal with high mobility to prevent the terminal with low mobility from experiencing ICI from the terminal with high mobility.
- Mobility may be measured by the speed sensor of the terminal. If the vehicle and the wireless terminal are interlocked, the resource region in which the wireless terminal of the vehicle transmits a signal may be selected using the information obtained from the speed sensor of the vehicle. More specifically, if the network or the terminal knows in advance the location or interval where the RSU is installed, or the average distance or density on the road, and only the network can know the information, the terminal can signal the terminal to the physical layer or higher layer signal. In addition, the terminal may estimate the average speed by counting the number of RSUs or the number of handovers per hour or more based on the corresponding information, and may divide and use resource regions according to such mobility.
- mobility may be determined according to the number of times the RSRP discovers an RSU that is equal to or greater than a preset value. To this end, an average installation distance between RSUs, or positions of RSUs may be signaled to the terminal as a physical layer or a higher layer signal. Alternatively, mobility may be known by counting the number of times that the terminal handovers on average.
- the resource pool may be set differently according to the lane progressed by the terminal. For example, when there are four lanes, if there is a left turn signal, the relative speed may be slowed down before the signal change in the left turnable lane. Alternatively, when only a specific vehicle moves in a specific lane, such as a bus-only lane, a signal transmitted by a vehicle running in the corresponding lane may be distinguished from a signal transmitted by vehicles running in other lanes and may be transmitted in a separate resource pool.
- the lane information terminal may be obtained through a location estimation technique, or the network may identify a lane of the terminal and signal the terminal through a network based position estimation technique.
- a vehicle running on a particular lane can transmit or receive signals in the resource zone configured for that particular lane.
- 11 shows an example in which the first lane is set as a bus dedicated lane. Referring to FIG. 11, a resource region transmitted and received by a vehicle running in one lane and a vehicle running in the remaining lanes may be separated. This is because the average speed of the vehicle running in one lane may be different from the average speed of the remaining lanes.
- increased mobility or reduced mobility in inter-vehicle communication may mean that congestion has occurred in the lane or road.
- the transmission period may be set to be long.
- all or part of a signal transmission period (or message generation period), a transmission probability, and a repetition number may be adjusted according to the mobility of the terminal. For example, when the speed of the terminal increases, the transmission cycle, the transmission probability, and the number of repetitions are set large.
- the transmission probability of the signal may be adjusted. For example, when the moving speed of the terminal is lower than a certain threshold, the transmission probability is lowered together to obtain an effect of reducing interference.
- the vehicle may be equipped with a plurality of multiple antennas.
- the left and right doors may be equipped with an antenna, and may be mounted with a protruding antenna (dolphin / shark) on the roof of the vehicle.
- the wireless channel may have a remarkably different characteristic according to the installation position of the antenna of the vehicle.
- antennas mounted on opposite doors may have significantly different channel characteristics from other vehicles or other UEs.
- the use as well as the channel characteristics can vary significantly.
- roof mounted antennas can be used to communicate with infrastructure
- door-mounted antennas can be used for distance measurement with other vehicles, lane level positioning, and high-speed communications between vehicles traveling in the same direction.
- a separate resource region (divided by time or frequency) may be used according to the usage of the antenna.
- a vehicle is equipped with multiple antennas, so it is a single terminal from the viewpoint of a cellular network.
- different antennas can be used depending on the antenna, so that the receiver can detect the receiver by having the most common channel characteristics in that region.
- a separate UE ID is provided for each antenna or for each use of the antenna, so that a vehicle may be interpreted as having a plurality of terminals.
- a usage index is provided for each terminal, and a separate index is used according to the usage index. Rules can be set to use resource zones.
- All or part of the proposed method may be used for a direct link between terminals such as D2D and V2V, but may also be used when UEs transmit signals (e.g., UL or DL) with a fixed infrastructure (eNB or RSU) such as V2I.
- UEs transmit signals
- eNB or RSU fixed infrastructure
- V2I V2I
- the base station can apply a common filter in the resource region in anticipation of the common mobility component in the resource region, thereby improving performance or reducing the detection complexity.
- methods for applying more randomized beamforming for transmission in the region or applying pre-distortion to attenuate common Doppler components Can be considered
- the moving speed when used as a reference for resource pool allocation / selection, the moving speed may be the moving speed of the terminal, but may be an average value of the moving speeds of the neighboring terminals of the terminal.
- the transmission parameters transmission period, probability, number of repetitions, transmission power, channel (energy or reference signal) sensing threshold, channel occupancy time window adaptation, etc.
- the terminal speed is adjusted. Adjusting the transmission parameters alone does not distinguish between adjusting the transmission parameters due to congestion in the actual surroundings or reducing the speed by the driver regardless of the congestion.
- the network or the RSU signals the transmission parameter determination value according to the average moving speed or the moving speed of the neighboring terminal, or the terminal averages the moving speed value of the neighboring terminal to determine the transmission parameter.
- the message transmitted by the vehicle terminal may include a movement speed value in a physical layer or a higher layer signal, and a field indicating a transmission parameter according to the movement speed of the terminal may be included in the physical layer or higher layer signal. have.
- the vehicle terminal may determine the transmission parameter in consideration of the message received from the neighboring terminal and its own moving speed information.
- FIG. 13 is a diagram showing the configuration of a transmission point apparatus and a terminal apparatus according to an embodiment of the present invention.
- the transmission point apparatus 10 may include a receiver 11, a transmitter 12, a processor 13, a memory 14, and a plurality of antennas 15. .
- the plurality of antennas 15 refers to a transmission point apparatus that supports MIMO transmission and reception.
- the reception device 11 may receive various signals, data, and information on the uplink from the terminal.
- the transmitter 12 may transmit various signals, data, and information on downlink to the terminal.
- the processor 13 may control the overall operation of the transmission point apparatus 10.
- the processor 13 of the transmission point apparatus 10 may process matters necessary in the above-described embodiments.
- the processor 13 of the transmission point apparatus 10 performs a function of processing the information received by the transmission point apparatus 10, information to be transmitted to the outside, and the memory 14 stores the calculated information and the like. It may be stored for a predetermined time and may be replaced by a component such as a buffer (not shown).
- the terminal device 20 may include a receiver 21, a transmitter 22, a processor 23, a memory 24, and a plurality of antennas 25. have.
- the plurality of antennas 25 refers to a terminal device that supports MIMO transmission and reception.
- the receiving device 21 may receive various signals, data, and information on downlink from the base station.
- the transmitter 22 may transmit various signals, data, and information on the uplink to the base station.
- the processor 23 may control operations of the entire terminal device 20.
- the processor 23 of the terminal device 20 may process matters necessary in the above-described embodiments.
- the processor 23 of the terminal device 20 performs a function of processing the information received by the terminal device 20, information to be transmitted to the outside, etc., and the memory 24 stores the calculated information and the like for a predetermined time. And may be replaced by a component such as a buffer (not shown).
- the description of the transmission point apparatus 10 may be equally applicable to a relay apparatus as a downlink transmission entity or an uplink reception entity, and the description of the terminal device 20 is a downlink. The same may be applied to the relay apparatus as the receiving subject or the uplink transmitting subject.
- Embodiments of the present invention described above may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
- a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- Embodiments of the present invention as described above may be applied to various mobile communication systems.
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Abstract
Description
Claims (14)
- 무선통신시스템에서 단말이 V2X(vehicle to everything) 관련 신호를 송수신하는 방법에 있어서,하나 이상의 측정 정보와 리소스 풀 파라미터를 비교하여 리소스 풀을 선택하는 단계; 및상기 리소스 풀을 사용하여 데이터를 전송하는 단계;를 포함하며,상기 하나 이상의 측정정보는 상기 단말의 지리적 위치에 관련된 것인, 신호 송수신 방법.
- 제1항에 있어서,상기 리소스 풀에는 단말의 지리적 위치에 관련된 파라미터 별로 값의 범위가 구성되어 있는 것인, 신호 송수신 방법.
- 제1항에 있어서,상기 리소스 풀에는 전송 주기, 전송 확률, 반복 횟수 중 하나 이상이 구성되어 있는 것인, 신호 송수신 방법.
- 제1항에 있어서,상기 하나 이상의 측정 정보는 상기 단말의 이동 방향 정보를 포함하는, 신호 송수신 방법.
- 제4항에 있어서,상기 단말의 이동 방향 정보는 상기 단말의 센서 또는 GPS(Global Positioning System)에 의해 측정된 것인, 신호 송수신 방법.
- 제5항에 있어서,상기 단말의 이동 방향 정보는 셀 ID 변경으로부터 도출된 것인, 신호 송수신 방법.
- 제6항에 있어서,상기 셀 ID는 RSU (road side unit)를 구별하는 식별자 정보인, 신호 송수신 방법.
- 제1항에 있어서,상기 하나 이상의 측정 정보는 상기 단말의 주변 단말의 이동 속도의 평균값인, 신호 송수신 방법.
- 제1항에 있어서,상기 하나 이상의 측정 정보는 상기 단말의 이동성(mobility)을 포함하는, 신호 송수신 방법.
- 제8항에 있어서,상기 이동성은 상기 단말의 속도 센서에 의해 측정된 것인, 신호 송수신 방법.
- 제8항에 있어서,상기 이동성은 RSRP가 미리 설정된 값 이상인 RSU를 발견하는 횟수에 따라 결정되는 것인, 신호 송수신 방법.
- 제1항에 있어서,상기 단말은 상기 리소스 풀의 미리 설정된 시간-주파수 자원 상에서 상기 데이터를 전송하는. 신호 송수신 방법.
- 제1항에 있어서,상기 단말은 상기 리소스 풀에서 시간-주파수 자원을 선택하여 상기 데이터를 전송하는, 신호 송수신 방법.
- 무선통신시스템에서 V2X(ehicle to everything) 관련 신호를 송수신하는 단말 장치에 있어서,송신 장치와 수신 장치; 및프로세서를 포함하고,상기 프로세서는, 하나 이상의 측정 정보와 리소스 풀 파라미터를 비교하여 리소스 풀을 선택하고, 상기 리소스 풀을 사용하여 데이터를 전송하며,상기 하나 이상의 측정정보는 상기 단말의 지리적 위치에 관련된 것인, 단말 장치.
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JP2017551272A JP6501905B2 (ja) | 2015-04-01 | 2016-04-01 | 無線通信システムにおいてv2x端末が信号を送受信する方法及び装置 |
CN201680019745.XA CN107439036B (zh) | 2015-04-01 | 2016-04-01 | V2x终端在无线通信系统中发送和接收信号的方法和装置 |
EP16773496.1A EP3280172B1 (en) | 2015-04-01 | 2016-04-01 | Method and device for transmitting, by v2x terminal, signal in wireless communication system |
US15/562,873 US10827500B2 (en) | 2015-04-01 | 2016-04-01 | Method and device for transmitting and receiving, by V2X terminal, signal in wireless communication system |
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KR102592651B1 (ko) | 2023-10-23 |
WO2016159715A3 (ko) | 2016-11-24 |
US20180115970A1 (en) | 2018-04-26 |
KR20170138458A (ko) | 2017-12-15 |
JP2018513626A (ja) | 2018-05-24 |
JP6501905B2 (ja) | 2019-04-17 |
EP3280172B1 (en) | 2024-05-29 |
EP3280172A2 (en) | 2018-02-07 |
CN107439036A (zh) | 2017-12-05 |
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EP3280172A4 (en) | 2018-11-21 |
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