WO2015012534A1 - 무선 통신 시스템에서 단말 간 직접 통신을 통한 단말 간 거리 측정 방법 및 이를 위한 장치 - Google Patents
무선 통신 시스템에서 단말 간 직접 통신을 통한 단말 간 거리 측정 방법 및 이를 위한 장치 Download PDFInfo
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- WO2015012534A1 WO2015012534A1 PCT/KR2014/006492 KR2014006492W WO2015012534A1 WO 2015012534 A1 WO2015012534 A1 WO 2015012534A1 KR 2014006492 W KR2014006492 W KR 2014006492W WO 2015012534 A1 WO2015012534 A1 WO 2015012534A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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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
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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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
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for measuring distance between terminals through direct communication between terminals in a wireless communication system, and an apparatus therefor.
- LTE 3rd Generat ion Partnershi Project Long Term Evolut ion
- E-UMTS Evolved Universal Mobility Telecommunications System
- UMTSCU UMTSCUniversal Mobile Telecommunications Systems
- LTECLong Term Evolut ion system LTECLong Term Evolut ion system. Details of the UMTS and EHJMTS technical specifications can be found in Release 7 and Release 8 of the "3rd Generat ion Partnership Project; Technical Speci- ficat ion Group Radio Access Network," respectively.
- an E-UMTS is an access gateway located at an end of a user equipment (UE) and a base station (eNode B), an eNB, and an network (E-UTRAN) and connected to an external network; AG)
- a base station can transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
- the cell is set to one of the bandwidths of 1.25, 2.5, 5, 10. 15, and 20Mhz to provide downlink or uplink transmission service to multiple terminals. Different cells may be configured to provide different bandwidths.
- the base station controls data transmission and reception for a plurality of terminals.
- the base station transmits downlink scheduling ' downlink (DL) data for downlink (DL) data, and information related to time / frequency domain, encoding, data size, and HARQ (Hybr id Automat ic Repeat and reQuest) to transmit data to the corresponding UE. It tells you.
- DL downlink scheduling ' downlink
- HARQ Hybr id Automat ic Repeat and reQuest
- the base station transmits uplink scheduling information to uplink (UL) data for uplink (UL) data and informs the user equipment of time / frequency domain, encoding, data size, HARQ related information, etc. available to the user equipment.
- An interface for transmitting user traffic or control traffic may be used between base stations.
- the core network (CN) may be composed of an AG and a network node for user registration of the terminal.
- the AG manages mobility of the UE in units of a TA Tracking Area including a plurality of cells.
- Wireless communication technology has been developed up to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing.
- new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, flexible use of frequency bands, simple structure and open interface, and adequate power consumption of the terminal.
- the present invention proposes a method for measuring the distance between terminals through direct communication between terminals in a wireless communication system and an apparatus therefor.
- a method for transmitting a signal for direct communication between terminals by a terminal includes: receiving a downlink subframe from a reference base station; Transmitting a first signal to a counterpart terminal based on a boundary of the downlink subframe; And transmitting a second signal to the counterpart terminal before a boundary of the downlink subframe by a predetermined offset.
- the terminal apparatus to perform includes: a wireless communication module for transmitting and receiving signals with a reference base station or a counterpart terminal apparatus for direct communication between the terminals; And a processor for processing the signal, wherein the processor transmits a first signal to the counterpart terminal device based on a boundary of a downlink subframe received from the reference base station, and a boundary of the downlink subframe And controlling the radio communication modules to transmit a second signal to the counterpart terminal device by a predetermined offset.
- the boundary of the downlink subframe may be received by a propagation delay according to a distance from the reference base station rather than a time point at which the reference base station transmits.
- the first signal may include information about the offset.
- the offset may be set to a preset value, for example, a timing advance value for transmitting an uplink signal to the reference base station.
- the terminal preferably receives the information about the offset from the operation base station.
- the second signal is received by the counterpart terminal by a propagation delay depending on the distance to the counterpart terminal from the time point at which the second signal is transmitted.
- the distance between terminals can be more efficiently determined by using direct communication between terminals in a wireless communication system.
- FIG. 1 is a diagram schematically illustrating an E-UMTS network structure as an example of a wireless communication system.
- Figure 2 is a radio between the UE and the E-UTRAN based on the 3GPP radio access network standards
- FIG. 7 shows the control plane and user plane structures of an interface protocol.
- FIG. 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
- FIG. 4 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
- FIG. 5 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- FIG. 6 illustrates a structure of a radio frame in an LTE TDD system.
- FIG. 7 is a diagram illustrating transmission and reception timing of an uplink radio frame and a downlink radio frame in an LTE system.
- 8 is a conceptual diagram of direct communication between terminals.
- FIG. 9 illustrates a timing point at which a target UE transmits a DS and a timing point at which an operation UE receives a DS according to an embodiment of the present invention.
- FIG. 10 is a diagram illustrating an area in which a target UE calculated according to an embodiment of the present invention can be located.
- FIG. 11 is another diagram illustrating an area where a target UE calculated according to an embodiment of the present invention can be located.
- FIG. 12 illustrates an example of transmitting and receiving a signal using direct communication between terminals, that is, a D2D signal according to an embodiment of the present invention.
- FIG. 13 is a diagram illustrating a method of identifying a location of a target UE according to an embodiment of the present invention.
- FIG. 14 is another diagram illustrating a method of locating a target UE according to an embodiment of the present invention.
- FIG. 15 is another diagram illustrating a method of locating a target UE according to an embodiment of the present invention.
- 16 illustrates an example of reducing a candidate position of a target UE by adding a circle corresponding to a distance between the corresponding DS reference eNB and the target UE according to an embodiment of the present invention.
- 17 illustrates an example of measuring a position of a target UE or a distance from a target UE using a difference in reception time of a DS signal according to an embodiment of the present invention.
- FIG. 18 illustrates another example of measuring a location of a target UE or a distance from the target UE using a difference in a reception time of a DS signal according to an embodiment of the present invention.
- FIG. 19 illustrates an example of measuring a distance between a target eNB and a target UE by determining a distance between each reference eNB and a target UE according to an embodiment of the present invention.
- the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system
- the embodiment of the present invention as an example may be applied to any communication system corresponding to the above definition.
- the present specification describes an embodiment of the present invention on the basis of the frequency division duplex (FDD) method, which is an exemplary embodiment of the present invention as an example of a hybrid-FDD (H-FDD) method or a time division (TDD) method.
- FDD frequency division duplex
- H-FDD hybrid-FDD
- TDD time division
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
- Control plane is terminal (User
- the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
- the physical layer which is the first layer, provides an Informat ion Transfer Service to a higher layer using a physical channel.
- the physical layer has a medium access control located at a higher level.
- the layer is connected via a transport channel (Trans Antenna Port Channel).
- Transport channel Trans Antenna Port Channel
- Data moves between the medium access control layer and the physical layer through the transport channel.
- Sender and receiver Data moves between physical layers through physical channels.
- the physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is in the downlink
- 0FDMA Orthogonal Frequency Diversity Access
- SC-FDMACS Carrier Frequency Diversity Access (UPD) method in uplink.
- the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the RLC layer of the second layer supports reliable data transmission.
- the function of the RLC layer may be implemented as a functional block inside the MAC.
- the PDCP (Packet Data Convergence Protocol) layer of the second layer performs a header compression function to reduce unnecessary control information for efficiently transmitting IP packets such as IPv4 and IPv6 in a narrow bandwidth wireless interface.
- a radio resource control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
- the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration (Conf igurat ion), re-conf igurat ion, and release of radio bearers (RBs).
- RB means a service provided by the second layer for data transmission between the terminal and the network.
- the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connected (RRC Connected) between the terminal and the RRC layer of the network, the terminal is in the RRC connected mode (Connected Mode), otherwise it is in the RRC idle mode (Idle Mode).
- the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
- One cell constituting an eNB is set to one of bandwidths such as 1.4, 3, 5, 10, 15, and 20 MHz to provide downlink or uplink transmission services to various terminals. Different cells may be configured to provide different bandwidths.
- a downlink transport channel for transmitting data from a network to a UE includes a BCH (Broadcast Channel) for transmitting system information, a Paging Channel (PCH) for transmitting a paging message, There is a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the UE to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
- RAC random access channel
- SCH uplink shared channel
- BCCH Broadcast Control Channel
- PCCH Paging Control Channel
- CCCH Common Control Channel
- MCCH Multicast Control Channel
- MTCHCMult icast Traffic Channel MTCHCMult icast Traffic Channel
- FIG. 3 is a diagram for describing physical channels used in a 3GPP system and a general signal transmission method using the same.
- the UE performs an initial cell search operation such as synchronizing with the base station (S301).
- the UE may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. have.
- the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell.
- the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- DL RS downlink reference signal
- the UE After the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information carried on the PDCCH to provide a more specific system.
- Information can be obtained (S302).
- the terminal may perform a random access procedure (Random Access Procedure) for the base station (steps S303 to S306).
- the UE preambles a specific sequence through a Physical Random Access Channel (PRACH). Transmit (S303 and S305), and can receive a response message for the preamble via the PDCCH and the exciting PDSCH (S304 and S306).
- PRACH Physical Random Access Channel
- a Content Ion Resolut ion Procedure can be additionally performed.
- the UE After performing the procedure described above, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control as a general uplink / downlink signal transmission procedure.
- a physical uplink ink control channel (PUCCH) transmission (S308) may be performed.
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI downlink control information
- the DCI includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.
- the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station is a downlink / uplink ACK / NACK signal, CQI (Channel Qual i Indicator, PMK Precoding Matrix index), RKRank Indicators).
- the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.
- FIG. 4 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
- a subframe includes 14 OFDM symbols.
- the first 1 to 3 OFDM symbols are used as the control region and the remaining 13 to 11 0FDM symbols are used as the data region.
- R1 to R4 represent reference signals (RSs) or Pi lot signals for antennas 0 to 3.
- the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
- the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
- Control channels allocated to the control region include PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Cal Downl Ink Control CHannel).
- the PCFICH is a physical control format indicator channel and is assigned to the PDCCH every subframe. Inform the terminal of the number of OFDM symbols used.
- the PCFICH is located in the first OFDM symbol and is set in preference to the PHICH and PDCCH.
- the PCFICH is composed of four REGs (Resource Element Groups), and each REG is distributed in the control region based on the cell IDCCel IDENT i ty.
- One REG consists of four resource elements (REs).
- RE represents a minimum physical resource defined by one subcarrier and one OFDM symbol.
- the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth, and is modulated by QPSKC Quadrature Phase Shift Keying.
- PHICH is a physical ⁇ Q Hybr id-Automat ic Repeat and request) indicator channel and is used to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for uplink HARQ is transmitted. PHICH is
- ACK / NACK is indicated in 1 bit and modulated with BPSKCBinary phase shi ft keying.
- SF Spreading Factor
- a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
- the number of PHICHs multiplexed into the PHICH group is determined according to the number of spreading codes.
- the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
- the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe.
- n is indicated by the PCFICH as an integer of 1 or more.
- the PDCCH consists of one or more CCE Control Channel Elements).
- the PDCCH transmits information related to resource allocation of a paging channel (PCH) and a downlink ink-shared channel (DL-SCH), an uplink scheduling grant, and an HARQ information list to each UE or UE group. Inform.
- the PClKPaging channel and DL-SCH (Down 1 ink-shared channel) are transmitted through the PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
- UE one or more UEs
- Information about the transmission is included in the PDCCH.
- a particular PDCCH is masked with a cyclic redundancy check (CRC) with a Radio Network Temporary Identity (RNTI) of "A”, a radio resource (eg, a frequency location) of "B", and a "C”
- CRC cyclic redundancy check
- RTI Radio Network Temporary Identity
- the terminal in the sal monitors the PDCCH using the R TI information it has, and if there is at least one terminal having an "A" RNTI, the terminals receive the PDCCH, through the information of the received PDCCH Receive the PDSCH indicated by "B" and "C ''.
- FIG. 5 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- an uplink subframe may be divided into a region to which a Physical Uplink Control CHannel (PUCCH) carrying control information is allocated and a region to which a PUSCHCPhysical Uplink Shared CHannel (CA) carrying user data is allocated.
- the middle part of the subframe is allocated to the PUSCH, and both parts of the data area are allocated to the PUCCH in the frequency domain.
- Control information transmitted on the PUCCH may include AC / NACK used for HARQ, a CQKChannel Quality Indicator indicating a downlink channel state, a RKRank Indicator for MIM0, and a SR (Scheduling Request), which is an uplink resource allocation request.
- the PUCCH for one UE uses one resource block occupying a different frequency in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are frequency hoped at the slot boundary.
- a radio frame is composed of two half frames, each of which is composed of four general subframes including two slots, a downlink pilot time slot (DwPTS), and a guard period.
- DwPTS downlink pilot time slot
- GP special subframe including an UpPTSOJplink Pilot Time Slot.
- the DwPTS is used for initial cell search, synchronization or Used for channel estimation.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. That is, DwPTS is used for downlink transmission, UpPTS is used for uplink transmission, and in particular, UpPTS is used for PRACH preamble or SRS transmission.
- the guard interval is a period for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- uplink / downlink subframe configuration (UL / DL conf igurat ion) in the LTE TDD system is shown in Table 1 below.
- D denotes a downlink subframe
- U denotes an uplink subframe
- S denotes the special subframe.
- downlink-uplink switching cycles downlink-uplink ink-switch-point per iodi c i ty
- FIG. 7 is a diagram illustrating transmission and reception timing of an uplink radio frame and a downlink radio frame in an LTE system.
- transmission of an uplink radio frame #i from a UE is performed from the beginning of Daewoong downlink radio frame # (N TA + N TA offset ) xr s seconds (where 0). ⁇ Nr A ⁇ 2 051 2 ).
- frame structure type 2 that is, that is,
- UE1 and UE2 perform direct communication between terminals, and UE3 and UE4 also perform direct communication between terminals.
- the e NB may perform control on the location of the time / frequency resources, transmission power, etc. for direct communication between UEs through an appropriate control signal.
- direct communication between the UEs may be set to be performed without control signals of the eNB.
- D2D devicei ce-to-devi ce
- the UE proposes a method of measuring a distance between the other UE and a distance from the other UE by using a direct communication signal between terminals with another UE.
- the UE can determine the location of the other UE or the distance from the other UE, various useful services can be provided. For example, when the distance of another user can be determined from the UE and the other user is located within a certain distance, the user can be notified of such a fact, and a service for identifying who is another user located nearby can be provided. As another example, when a plurality of UEs transmit a message such as an advertisement, the user may enable the operation of setting only to receive an advertisement message existing within a certain distance from the UE. As another example, the user may be provided with a service that notifies the user by observing whether a UE registered as a target of interest exists within a certain area or a distance from the user.
- a method of receiving a signal transmitted by an eNB and determining its location based on the UE has been proposed.
- a UE measures a signal transmitted by an eNB, for example, a posi ionization reference signal (PRS) of a 3GPP LTE system, and the arrival time of each eNB transmission signal or a difference in the arrival time of a transmission signal of two eNBs.
- PRS posi ionization reference signal
- the UE measures the difference in the arrival time of the transmission signal at the two eNBs, it is possible to determine the difference in the distance from the two eNBs, the difference in the distance from the two eNBs at a point on the curve You can see that is located. If you repeat this process for the other two eNBs, the UE will be You get several curves and you can see that the UE is located where the curves meet. Actually, for this operation, location information of the eNB measured by the UE is required.
- the network already knows where the eNB is located, if the UE reports to the network the arrival time of the above-described eNB transmission signal or the difference between the arrival times of the two eNB transmission signals, the network can determine the location of the UE. have.
- a method for receiving the signal transmitted by the UE and receiving the signal from the eNB based on the eNB has been proposed.
- a UE transmits a specific signal, for example, a sounding reference signa l (SRS) of 3GPP LTE and receives it by a plurality of eNBs, and measures the arrival time of a signal at each eNB or a difference in arrival time at two eNBs.
- SRS sounding reference signa l
- the network may calculate a distance between the UE at each eNB or the distance between the UE at the two eNBs based on the location information of each eNB held in advance, and this operation may be repeated for multiple eNBs.
- the point may be identified as a point where the corresponding UE is located.
- the network since the network finally determines the location of the UE, if a specific UE wants to utilize the location information of another UE, the network measures the location through a series of operations with the UE to which the location is to be measured. This information should be delivered to the UE that wants it.
- signaling overhead is generated between the network and the UE in the process, and when the number of UEs becomes very large, the computational complexity required for the network to calculate the location of each UE greatly increases. In particular, when the information desired by the UE corresponds to partial information such as a distance from the target UE rather than the exact location of the target UE, such signaling overhead or computational complexity may be unnecessary.
- the present invention provides a signaling overhead and a network by transmitting and receiving a direct signal between a UE and a signal using direct communication between terminals.
- each UE transmits a signal indicating its existence according to a predetermined rule.
- This signal is called DS (di discovery signal).
- DS discovery signal
- a UE that receives a specific DS is designed to determine who is the UE that has transmitted this DS.
- the DS may include ident i ty information of the transmitting UE.
- the DS transmission rule includes a method of generating a DS and a time / frequency resource for transmitting a DS by each UE.
- the network may operate to broadcast the DS transmission rule to allow the UEs participating in the DS transmission and reception to grasp the rule.
- a UE which transmits a DS, has an eNB as a reference for determining a transmission time point.
- This is called a DS reference eNB
- the UE may have a plurality of DS reference eNBs.
- an eNBl may be transmitted as a DS reference eNB
- a DS may be transmitted
- an eNB2 may be transmitted as a DS reference eNB.
- a UE that wants to measure the location of another UE by receiving a DS is called an operation UE, and a UE that the operation UE wants to measure is called a target UE.
- the operation UE measures the position of the target UE or the distance between itself and the target UE by measuring the DS transmitted by the target UE.
- the operation described in the present invention is not limited to the case of using the DS, and it is obvious that the present invention can also be applied to the case of using any signal directly transmitted and received between the UE.
- FIG. 9 illustrates a time point at which a target UE transmits a DS and a time point at which an operation UE receives a DS, according to an embodiment of the present invention.
- a target UE determines a transmission time of a DS based on a time point of receiving a downlink subframe boundary of eNB n . If eN transmits a downlink subframe boundary at this point and a propagation ion del ay between eNB n and the target UE is k n , the time point at which the target UE receives the downlink subframe boundary of eNB n is + k ⁇ l At this point, the target UE is transmitting his forehand DS at the time the amount of time F n, F n a value fixed in advance It may be a value or may be given by an indication of an eNB.
- the F n value may be determined to be the same value as the TAC iming advance value applied when the UE transmits a UL signal to the eNB. If the F n value is fixed in advance, it may be fixed to the same value for all DS reference eNBs.
- the propagation delay between the DS reference eNB n and the operation UE is assumed to be n .
- FIG. 10 is a diagram illustrating an area where a target UE calculated according to an embodiment of the present invention can be located.
- FIG. 10 is 1 £ ⁇ '.
- the maximum and minimum values at the point in time at which the operation UE receives the DS of the target UE are shown in the target UE position 1 and the target UE position 2, respectively.
- Equation 1 When the target UE is in position 1, a condition as in Equation 1 below may be established.
- Equation 2 a condition relating to X may be derived as shown in Equation 2 below.
- Equation 3 the condition as shown in Equation 3 below can be established, in particular, it can be seen that the condition is irrelevant to X.
- FIG. 11 is another diagram illustrating an area where a target UE calculated according to an embodiment of the present invention can be located.
- FIG. 11 assumes the case where x> d '. 11
- the maximum value and the minimum value at the time when the operation UE receives the DS of the target UE are shown in the target UE position 1 and the target UE position 2, respectively.
- Equation 4 When the target UE is in position 1, a condition as in Equation 4 below may be established.
- Equation 5 a condition as in Equation 5 below may be established.
- Equation 5 a condition relating to X may be derived as shown in Equation 6 below.
- Equation 7 the propagation delay X between the operation UE and the target UE satisfies the condition of Equation 7 below.
- Equation 7 since 13 ⁇ 4 is the point in time at which the operation UE receives the DS transmitted by the target UE, measurement may be performed by the operation UE, and (t n + d is also determined by the operation UE with a downlink subframe boundary of 6 ⁇ 11) .
- F n is a value already known by the operation UE if it is a predetermined value, and if the value is indicated by the eNB to the target UE, the eNB delivers the value or the target UE directly sends the operation UE to the operation UE. For example, some fields of the DS may be used to convey F n .
- (-103] (-d n ) can be calculated based on the measurement of (t n + d but the operation UE knows ( ⁇ ). For example, the operation UE can randomly access the DS reference eNB n . And the TA value informed by eNB n at this time It can be thought of as RTD (round tr ip del ay) with eN3 ⁇ 4, that is 2 * d n .
- the target UE may transmit the value of F n used by the target UE using some fields of the direct communication signal between the DS or other terminals.
- the F n value represents an interval between a downlink subframe boundary received by a target UE transmitting a signal from a reference eNB and a time point at which a signal between terminals is transmitted.
- the signal between terminals which includes the F n value itself may be transmitted without applying the value F n can be helpful.
- the target UE transmits a signal between terminals without applying F n , that is, applies F n to a fixed value that 0 or other operation UE knows in advance, and uses some fields of the signal between terminals.
- the operation UE may inform the F n value to be applied to the signal transmission between the terminals.
- the ⁇ is centered on the downlink subframe boundary time point (u n in FIG. 9) received from the reference eNB. After extracting the value from the F n attempt signal reception between the terminal and the detection signals are not applied, it considers the F value applies to the terminal between the signals received, It is.
- FIG. 12 illustrates an example of transmitting and receiving a signal using direct communication between terminals, that is, a D2D signal according to an embodiment of the present invention.
- the target UE transmits the D2D signal # 1 including the F n value without applying! ⁇ , And then transmits the D2D signal # 2 by applying F n .
- the operation UE can determine the upper limit and the lower limit for the propagation delay X with the target UE as described above.
- the upper limit and the lower limit thus identified may have different values for the DS reference eNB. Therefore, the operation UE may further narrow the range of the region where X exists by first calculating the upper and lower limits of X for each of the DS reference eNBs, and then taking an intersection of the calculated regions of X.
- the propagation speed of the electromagnetic wave is added thereto. By multiplying, it can be converted into the distance between the operation UE and the target UE.
- FIG. 13 is a diagram illustrating a method of identifying a location of a target UE according to an embodiment of the present invention.
- k n + x denotes a propagation delay of a signal arriving from the DS reference eNB n to the operation UE via the target UE
- the location of the target UE generating the same ⁇ is DS reference eNB n.
- an ellipse that focuses on the location of the operation UE That is, if the operation UE measures u n and calculates k n + x based on this, the operation UE forms an ellipse and knows that the target UE is located at some point on the ellipse.
- FIG. 14 is another diagram illustrating a method of locating a target UE according to an embodiment of the present invention.
- FIG. 14 corresponds to a case where an ellipse is formed for two DS reference eNBs according to the principle described with reference to FIG. 13, and the target UE may be located at a position corresponding to an intersection of two ellipses.
- FIG. 15 is another diagram illustrating a method of identifying a location of a target UE according to an embodiment of the present invention.
- FIG. 15 corresponds to a case where the above operation is repeated for three DS reference eNBs. Since the intersection of the three ellipses appears as a single point, the position of the target UE can be fixed to one.
- an ellipse in which the target UE may be located may be formed for two or more DS reference eNBs to determine the location of the target UE.
- the operation UE needs information about the location of each DS reference eNB, and this information can be notified to the UE through a method such as broadcast in advance.
- the location information of the DS reference eNB is absolute such as the longitude and latitude of each eNB. It may be expressed in the form of coordinates, in which case the operation UE can determine the absolute coordinates of the target UE.
- absolute coordinates are not required, such as when the distance between the target UE and the operation UE is measured, only relative positions are needed. For example, only distance information between DS reference eNBs may be provided to the operation UE.
- a nm represents a distance between the DS reference eNB n and eN ⁇
- the relative position of each eNB may be determined.
- the operation UE needs to know the distance from each DS reference eNB, which may be determined from a TA obtained in the random access process as described above, or from a signal (for example, PRS) transmitted by each DS reference eNB. Can also be obtained.
- the operation UE can know the distance between the target UE and the DS reference eNB, it is also helpful to measure the distance to the target UE or to locate the target UE.
- the network informs the operation UE of the distance between the target UE and the specific DS reference eNB, or the target UE uses D2D communication, for example, using some bits of DS to inform the operation UE between itself and the specific DS reference eNB. Suppose you tell the distance of.
- the F n value used by the target UE to transmit the D2D signal is set to the same value as the TA value used to transmit the uplink signal, and the F n value is transmitted to the operation UE through a direct transmission / reception signal between terminals. If so, this allows the operation UE to know the distance between the target UE and the reference eNB. This is because a TA value of a specific UE is typically set to a value corresponding to twice the propagation delay between the UE and the reference eNB. That is, the operation UE may consider that a value obtained by dividing the F n value informed by the target UE in half corresponds to a propagation delay between the target UE and the reference eNB.
- the operation UE may determine a candidate location of the target UE from the DS transmitted by the target UE based on the corresponding DS reference eNB, and adds a circle corresponding to the distance between the corresponding DS reference eNB and the target UE.
- the candidate position of the target UE can be reduced.
- 16 illustrates an example of reducing a candidate position of a target UE by adding a circle corresponding to a distance between the corresponding DS reference eNB and the target UE according to an embodiment of the present invention. Illustrated.
- the operation UE receives a DS for the DS transmitted based on 613 ⁇ 4 1 and 6, which are two DS reference eNBs, respectively. If u n and ⁇ are measured, the distance between the target UE and the two DS reference eNBs can be determined by the difference between these two values. Specifically Here, the distance X between the target UE and the operation UE, which is a common element, disappears. As described above, the operation UE knows F n and F ra in advance, or for convenience of operation, the two values may be described in the same manner, in which case the two components disappear.
- the information of ⁇ and ⁇ may be derived from time point information (eg, radio frame and subframe index) at which the target UE transmits DS based on each DS reference eNB, and a time unit of a certain level or less (eg, For example, it may be assumed that the DS reference eNB is synchronized in 1 ms units constituting the subframe. That is, if it is assumed that two DS reference eNBs are synchronized in units of 1 ms, the operation UE may assume that the downlink subframe boundary transmitted by the two DS reference eNBs corresponds to the same time.
- time point information eg, radio frame and subframe index
- a time unit of a certain level or less eg, For example, it may be assumed that the DS reference eNB is synchronized in 1 ms units constituting the subframe. That is, if it is assumed that two DS reference eNBs are synchronized in units of 1 ms, the operation UE may assume that
- the operation UE may calculate k n -k n corresponding to the difference in distance between the target UE and the DS reference eNB.
- FIG. 17 illustrates an example of measuring a location of a target UE or a distance from the target UE using a difference in reception time of a DS signal according to an embodiment of the present invention.
- a curve indicating a candidate region where a target UE can be located is formed based on location information of two DS reference eNBs.
- the curve is represented by a set of points where the difference in distance from two DS reference eNBs is given constantly. If this operation is performed for the other two eNB combinations, another curve may be formed and the intersection of the two curves becomes the position of the target UE.
- FIG. 18 illustrates another example of measuring a location of a target UE or a distance from the target UE using a difference in reception time of a DS signal according to an embodiment of the present invention.
- FIG. 18 corresponds to a case where the distance measurement of FIG. 17 is additionally performed for eNB2 and eNB3.
- the operation UE needs to determine a distance from each DS reference eNB, which may be determined from a TA obtained in the random access process as described above, or may be a signal transmitted from each DS reference eNB. For example, it may be obtained from the PRS.
- the operation UE receives F n and F m values directly from the target UE and thus determines the distance between each reference eNB and the target UE
- the candidate position of the target UE obtained through FIG. 17 may be further narrowed through distance information between each reference eNB and the target UE.
- 19 illustrates an example of determining a distance between each reference eNB and a target UE to measure the distance between the target UE according to an embodiment of the present invention.
- the target UE obtaining a TA value with each reference eNB and transmitting it as a signal between terminals may be too complicated and overhead because it requires the target UE to attempt to access several eNBs.
- a few reference eNBs use the same F n value as the TA value used for uplink transmission when transmitting a signal between terminals while matching a standard, and a predetermined value when matching the reference with other reference eNBs; That is, it is possible to set a fixed value known to the UE or other operation UE in advance to the value F n .
- F n when synchronizing with a serving cell of a target UE, F n may be adjusted to a TA value applied to uplink transmission, but! ⁇ may be set to 0 when synchronizing with other eNBs. . In this case, it may be informed whether this F n value is equal to the TA value applied to the uplink transmission by the target UE in transmitting! ⁇ .
- the operation UE should be able to determine when the target UE assumes the DS reference eNB and transmits the DS. This information may be delivered by the network to the operation UE.
- the operation UE may calculate the location of the target UE. This calculating operation may be performed by the network providing the location information of the DS reference eNB to the operation UE and calculated directly by the operation UE based on the information. Alternatively, in order to simplify the operation UE, the operation UE corresponds to each DS reference eNB. Receive time of the target UE DS or by a specific DS. It is also possible to operate the network to determine the location of the target UE by measuring the difference in the reception time of the target UE DS for the eNB combination and reporting it to the network. In particular, the latter case may be utilized when the network wants to determine the location of the target UE through the operation UE when the target UE does not have a separate location capability.
- FIG. 20 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the communication device 2000 includes a processor 2010, a memory 2020, an RF module 2030, a display module 2040, and a user interface module 2050.
- the communication device 2000 is shown for convenience of description and some models may be omitted. In addition, the communication device 2000 may further include necessary modules. In addition, in the communication device 2000, some of the hairs may be divided into more granular hairs.
- the processor 2010 is configured to perform an operation according to the embodiment of the present invention illustrated with reference to the drawings. In detail, the detailed operation of the processor 2010 may refer to the contents described with reference to FIGS. 1 to 19.
- the memory 2020 is connected to the processor 2010 and stores an operating system, an application, a program code, data, and the like.
- the RF modules 2030 are connected to the processor 2010 and perform a function of converting a baseband signal into a radio signal or converting a radio signal into a baseband signal. To this end, the RF module 2030 performs analog conversion, amplification filtering and frequency up-conversion, or a reverse process thereof.
- Display modules 2040 are connected to the processor 2010 and display various information.
- the display modules 2040 can use well known elements such as, but not limited to, LCDCLiquid Crystal Diplay, LED Light Emitting Diode (LED), and 0rgani c Light Emitting Diode (0LED).
- the user interface models 2050 are connected to the processor 2010 and can be configured with a combination of well known user interfaces such as a keypad touch screen and the like.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be a different component or It may be implemented in a form that is not combined with the feature. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment or may be substituted for components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- an embodiment according to the present invention may be implemented by various means, for example, hardware, firmware (f i nnware), software, or a combination thereof.
- an embodiment of the present invention may include one or more ASICs capacitive speci f ic integrated ci rcui ts (DSP), digital signal processor (DSPs), digital signal processing devices (DSPs), programmable logic (D DS) devices), FPGAs (ield programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform 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.
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Abstract
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Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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JP2016529704A JP2016535515A (ja) | 2013-07-22 | 2014-07-17 | 無線通信システムにおいて端末間直接通信を用いた端末間距離測定方法及びそのための装置 |
US14/906,865 US9743240B2 (en) | 2013-07-22 | 2014-07-17 | Method for transmitting signals via device-to-device link in wireless communication system, and apparatus therefor |
ES14829084T ES2786257T3 (es) | 2013-07-22 | 2014-07-17 | Método para medir la distancia entre dispositivos a través de comunicación directa de dispositivo a dispositivo en un sistema de comunicación inalámbrico, y aparato para ello |
KR1020157036005A KR102194929B1 (ko) | 2013-07-22 | 2014-07-17 | 무선 통신 시스템에서 단말 간 직접 통신을 통한 단말 간 거리 측정 방법 및 이를 위한 장치 |
RU2016101235A RU2621898C1 (ru) | 2013-07-22 | 2014-07-17 | Способ для измерения расстояния между устройствами с помощью прямой связи устройство-устройство в системе беспроводной связи и соответствующий прибор |
EP14829084.4A EP3026456B1 (en) | 2013-07-22 | 2014-07-17 | Method for measuring distance between devices via direct device-to-device communication in wireless communication system, and apparatus therefor |
EP19215101.7A EP3640673A1 (en) | 2013-07-22 | 2014-07-17 | Method for measuring distance between devices via direct device-to-device communication in wireless communication system, and apparatus therefor |
CN201480041704.1A CN105408765B (zh) | 2013-07-22 | 2014-07-17 | 在无线通信系统中经由直接设备对设备通信测量设备之间的距离的方法及其装置 |
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EP (2) | EP3640673A1 (ko) |
JP (2) | JP2016535515A (ko) |
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CN (1) | CN105408765B (ko) |
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CN108141776A (zh) * | 2015-08-07 | 2018-06-08 | 中兴通讯股份有限公司 | 基于d2d侧链路信道测量ue到ue距离的系统和方法 |
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CN108702345B (zh) * | 2015-12-18 | 2022-04-05 | 弗劳恩霍夫应用研究促进协会 | 无线通信系统中具有缩短的端到端延时的数据信号传输 |
WO2017188547A1 (ko) * | 2016-04-25 | 2017-11-02 | 엘지전자(주) | 무선 통신 시스템에서 d2d 단말들 사이의 거리를 추정하기 위한 방법 및 이를 위한 장치 |
EP3416436B1 (en) * | 2017-06-15 | 2021-02-17 | BlackBerry Limited | Configuring sidelink communications |
US11412467B2 (en) | 2017-11-10 | 2022-08-09 | Lg Electronics Inc. | Method and device for controlling receiving window for sidelink signal |
CN113227819A (zh) * | 2019-03-28 | 2021-08-06 | 华为技术有限公司 | 用于异步装置和无时间帧结构的装置处的信号检测的系统和方法 |
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Also Published As
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RU2621898C1 (ru) | 2017-06-08 |
JP2016535515A (ja) | 2016-11-10 |
CN105408765A (zh) | 2016-03-16 |
US20160165398A1 (en) | 2016-06-09 |
EP3026456A4 (en) | 2017-03-15 |
KR20160034852A (ko) | 2016-03-30 |
EP3640673A1 (en) | 2020-04-22 |
JP2019216432A (ja) | 2019-12-19 |
CN105408765B (zh) | 2018-09-07 |
ES2786257T3 (es) | 2020-10-09 |
JP7174675B2 (ja) | 2022-11-17 |
EP3026456B1 (en) | 2020-02-05 |
EP3026456A1 (en) | 2016-06-01 |
KR102194929B1 (ko) | 2020-12-24 |
US9743240B2 (en) | 2017-08-22 |
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