WO2015115793A1 - 무선 통신 시스템에서 장치 대 장치 단말의 신호 송수신 방법 및 장치 - Google Patents
무선 통신 시스템에서 장치 대 장치 단말의 신호 송수신 방법 및 장치 Download PDFInfo
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Classifications
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Definitions
- the following description relates to a wireless communication system, and more particularly, to a method and apparatus related to timing advances in device to device communication.
- Wireless communication systems have been 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, FDMA frequency division multiple access (TDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency division SC-FDMA.
- CDMA code division multiple access
- TDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division SC-FDMA
- Multiple access (MC) system MC—FDMA (multi carrier frequency division multiple access) system.
- D2D communication establishes a direct link between user equipments (UEs) and exchanges voice and data directly between terminals without going through an evolved NodeB (eNB).
- UEs user equipments
- eNB evolved NodeB
- D2D communication may include methods such as UE-to-UE communication, Peer-to-Peer communication, and the like.
- the D2D communication method 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 rapidly increasing data traffic.
- the D2D communication unlike the conventional wireless communication system, since the data is exchanged between devices without passing through the base station, the network can be overloaded.
- the D2D communication it can be expected to reduce the procedure of the base station, decrease 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.
- the present invention is to determine whether to apply timing advance in D2D communication.
- An embodiment of the present invention provides a method of transmitting and receiving a signal by a device-to-device (D2D) terminal in a wireless communication system, the method comprising: receiving a D2D communication resource configuration; And transmitting a D2D communication signal based on the D2D communication resource configuration, and when the terminal transmits the D2D communication signal through a resource indicated by a base station, the D2D communication signal includes an uplink and a downlink radio.
- the D2D communication signal is transmitted at a first timing determined from a value (NTA) indicating a timing offset between frames, and when the UE selects a resource for transmitting the D2D communication signal, the D2D communication signal is transmitted between an uplink and a downlink radio frame.
- a signal transmission / reception method is transmitted at a second timing determined regardless of a value NTA indicating a timing offset.
- An embodiment of the present invention provides a D2D terminal for transmitting and receiving a device-to-device (D2D) signal in a wireless communication system, comprising: reception modules; And a processor, wherein the processor receives a D2D communication resource configuration, transmits a D2D communication signal based on the D2D communication resource configuration, and transmits the D2D communication signal through a resource indicated by the terminal from a base station.
- D2D device-to-device
- the D2D communication signal is transmitted at a first timing determined from a value (NTA) indicating a timing offset between an uplink and a downlink radio frame, and when the terminal selects a resource for transmitting the D2D communication signal,
- NTA a value indicating a timing offset between an uplink and a downlink radio frame
- the D2D communication signal is a D2D user equipment that is transmitted at a second timing determined regardless of a value NTA indicating a timing offset between uplink and downlink radio frames.
- reception of a timing advance command may be essential.
- NT A is determined from a timing advance TA indicated by the timing advance command, and the first timing is a fixed timing advance and a value NTA indicating a timing offset between the uplink and downlink radio frames. It can be determined from the offset (NTAoffset).
- the first timing is (NTA + NTAoffset) * Ts
- the NAT is a value indicating a timing offset between uplink and downlink radio frames
- NTAoffset is a fixed timing advance offset
- Ts is a basic time unit.
- the NTAoffset may be 625 in TDD and 0 in FDD.
- the first timing may be uplink timing of the terminal.
- the terminal may correspond to transmission mode 1.
- the second timing may be independent of a timing advance command.
- the second timing may be predetermined.
- the second timing may be NTAoffset * Ts
- NTAoffset may be a fixed timing advance offset
- Ts may be a basic time unit.
- the second timing may be downlink timing.
- the terminal may correspond to transmission mode 2.
- the present invention it is possible to increase the efficiency of the D2D communication environment by applying the timing advance according to the transmission mode.
- 1 is a diagram showing the structure of a radio frame.
- FIG. 2 shows a resource grid in a downlink slot Drawing.
- 3 illustrates a structure of a downlink subframe.
- 5 to 6 are diagrams for explaining timing advance mapping according to an embodiment of the present invention.
- FIG. 7 is a diagram related to a priority of signal transmission according to an embodiment of the present invention.
- FIG 8 to 10 are diagrams for explaining the transfer of timing advances according to an embodiment of the present invention.
- FIG. 11 is a diagram illustrating a configuration of a transmission and reception apparatus.
- 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 configurations or features of one embodiment may be included in another embodiment or may be substituted for 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. Certain operations described as being 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), and an access point (AP).
- the repeater may be replaced by terms such as relay node (RN) and relay station (RS).
- RN relay node
- RS relay station
- the term 'terminal' may be replaced with terms such as a user equipment (UE), a mobile station (MS), an MSSC mobile subscriber station (MS), and a subscriber station (SS).
- the term “base station” may be used as a meaning of a device that refers to a scheduling execution node, a cluster header, and the like. If the base station or the relay also transmits a signal transmitted by the terminal, it can be regarded as a kind of terminal.
- a cell described below is 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 at a point.
- eNB base station
- RRH remote radio head
- relay a relay
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802 systems, 3GPP systems, 3GPP LTE and LTE-Advanced (LTE-A) systems, and 3GPP2 systems, which are wireless access systems. 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 FDMA
- Time Division Multiple Access TDMA
- Orthogonal Frequency Division Multiple Access OFDMA
- SC-FDMA Single Carrier Frequency Division Multiple Access
- CDMA may be implemented by a radio technology such as UTRAOJniversal Terrestrial Radio Access) or CDMA2000.
- TDMA can be implemented with wireless technologies such as GSMCGlobal System for Mobile communications (GPRS) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- 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 UMTS Jniversal Mobile Telecommunications System.
- 3rd Generation Partnership Project (3GPP) LTEdong term evolution (GPP) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced is the evolution of 3GPP LTE.
- 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).
- IEEE 802.16e WiMA-OFDMA Reference System
- advanced IEEE 802.16m WiMA-OFDMA Advanced system
- 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 FDEXFrequency Division Duplex (FDEXFrequency Division Duplex) and a type 2 radio frame structure applicable to TDD (Time Division Duplex).
- FIG. 1 (a) is a diagram illustrating a structure of a type 1 radio frame.
- 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 TTKtransmission 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 includes a plurality of resource blocks (RBs) in the frequency domain.
- RBs resource blocks
- an OFDM symbol represents one symbol period.
- An OFDM symbol may also be referred to as an SC-FDMA symbol or symbol period.
- 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).
- CPs include extended CPs and normal C normal CPs.
- an OFDM symbol consists of a generic 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 slot When a normal CP is used, one slot includes 7 OFDM symbols, and thus, 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
- FIG. 1B shows the structure of a type 2 radio frame.
- 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.
- the 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 merely an example, and the number of subframes included in the radio frame, 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 may include 7 OFDM symbols, but in the case of an extended CP, one slot may include 6 OFDM symbols.
- Each element on the resource grid is called a resource element.
- Single Resource blocks contain 12x7 resource elements.
- the number of resource blocks (NDLs) 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.
- the downlink control channels used in the 3GPP LTE / LTE-A system include, for example, a physical control format indicator channel (PCFICH) and a physical downlink control channel (Physical). Downlink Control Channel (PDCCH), Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH), etc.
- PCFICH is transmitted in the first OFDM symbol of a subframe and is used for the transmission of the control channel in the subframe.
- the PHICH includes the HARQ ACK / NACK signal as a response of the uplink transmission Control transmitted through the PDCCH *
- the information is referred to as downlink control information (DCI), which includes uplink or downlink scheduling information, or includes uplink transmission power control commands for an arbitrary group of UEs.
- DCI downlink control information
- 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).
- the 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 the number of CCEs 1 ⁇ 2, 4 and 8 (corresponding to PDCCH formats 0, 1, 2 and 3, respectively) may be used for PDCCH transmission.
- 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 UE, 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 Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific terminal, the cell-RNTI (C-RNTI) identifier of the terminal may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indicator identifier (P-RNTI) may be masked to the CRC.
- RNTI Radio Network Temporary Identifier
- 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 PUCCH and PUSCH *.
- PUCC 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.
- a specific node may provide a representative synchronization signal. Transmit and the remaining UEs can synchronize with it.
- some nodes may be referred to as an eNB, a UE, an SRNC synchronization reference node, or a synchronization source for transmitting and receiving D2D signals.
- a method of transmitting a D2D synchronization signal (D2DSS, D2D Synchronization Signal) and transmitting and receiving signals in synchronization with the remaining terminals may be used.
- the PD2DSS may be a Zadoff-chu sequence of predetermined length or a structure similar to / modified / repeated from PSS.
- the SD2DSS may be similar to / modified / repeated structures such as M-sences or SSS. If UEs synchronize from eNB, SRN becomes eNB and D2DSS becomes PSS / SSS.
- PD2DSCH Physical D2D synchronization channel
- D2D signal for example, D2DSS-related information, duplex mode (Duplex Mode, DM), TDD UL / DL configuration, Resource pool related information, types of applications related to D2DSS, etc.
- the PD2DSCH may be transmitted on the same subframe as the D2DSS or on a subsequent subframe.
- the SRN may be a node for 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 undergoing a predetermined channel coding.
- the SRN may be an eNB or a specific D2D terminal.
- the terminal may be an SRN, and in the case of intercell discovery, the terminals may be SRN in order for the neighboring cell terminals to know timing.
- the UE may relay the D2DSS at a time point of adding a predetermined offset to the timing received from the terminal.
- the D2DSS can be relayed through multiple hops. If there are a plurality of terminals relaying the D2DSS, or there are a plurality of clusters in the vicinity, the terminal receiving the D2DSS may receive a plurality of D2DSSs while observing a plurality of D2DSSs.
- a scheduling assignment indicates a physical layer signal (ie, D2D control information) indicating a time and / or frequency resource location of a transmission resource of a D2D signal, a modulation and coding scheme (MCS), etc. before transmission of a D2D signal. Signal to transmit).
- the transmitting UE may transmit by using / applying a timing advance (TA).
- TA timing advance
- the TA information of the transmitting UE (or the average (or maximum) TA of the D2D Tx UE in the sal, or the TA range (or maximum TA) of the UE in the sal) may be transmitted through the physical layer signal, the higher layer signal, or the like. May be signaled to the.
- TA2 information and TA related information of the transmitting UE may be included in the PD2DSCH and may be signaled to the receiving UE.
- the D2D signal transmitting UE may transmit the TA value as a physical layer signal separate from the data.
- the receiving UE when the D2D transmitting UE transmits the D2D signal by applying the TA, the receiving UE must inform the receiving UE of the TA information so that the receiving UE can properly receive the D2D signal.
- the transmission timing used by the D2D transmitting UE is determined from the TA indicated by the timing advance command, and when the D2D transmitting UE informs the TA information to the D2D receiving UE through a physical layer signal / high layer signal or the like, it is received from the eNB. It is necessary to define a case where the number of TA bits and the number of bits for transmitting TA information to the D2D receiving UE are different.
- the UE may receive an 11-bit timing advance command from the eNB in a random access process, in which the D2D transmitting UE sends the TA information to a number of bits smaller than 11 bits (for example, the 6-bit TA field is SA). (Included in the file), you will need to make appropriate adjustments. This will be described in detail below.
- a TA value which can be represented by a TA field in an SA, may be determined and signaled as the value closest to a TA command value received by an eNB.
- the D2D transmitting UE may receive a timing advance command and determine a value NTA indicating a timing offset between an uplink and a downlink radio frame from a timing advance TA indicated by the timing advance command. Subsequently, a timing advance indicator ⁇ indicating the D2D signal reception timing adjustment value ⁇ 'can be set using the value NTA indicating the timing offset.
- the D2D signal receiving UE may determine a transmission timing used by the D2D transmitting UE through a timing advance indicator ( ⁇ ) transmitted through D2D control information, SA, PD2DSCH, and the like, and may receive a D2D signal.
- a timing advance indicator ( ⁇ ) transmitted through D2D control information, SA, PD2DSCH, and the like, and may receive a D2D signal.
- the timing advance indicator (I ⁇ ) when the timing advance indicator (I ⁇ ) is set, the value NTA indicating the timing offset may be mapped to the closest value that can be indicated by the field of the D2D signal reception timing adjustment value ⁇ '.
- the set timing advance indicator ( ⁇ ) may be transmitted through SA and / or D2D control information.
- the value NTA indicating the timing offset may be TA * 16, and TA may be one of 0, 1,..., 1282. That is, NTA is one of 0, 16, 32, ..., 20512 can be a total of 1238 kinds. If the number of bits available for D2D transmitting UE to transmit TA information is 6 bits, the number of indexes can be represented by 64. Therefore, the value received from the eNB (TA or NTA converted therefrom) can be converted into a specific value among 6 bits. It must be mapped / converted so that it can be delivered in 6 bits. Specifically, referring to FIG.
- a value NTA indicating a timing offset and a D2D signal reception timing adjustment value ⁇ ' may be ⁇ versus one.
- ⁇ is the maximum number 20512 of the value NTA indicative of the timing offset multiplied by 16 to the number 64 of values representable in the field indicative of the D2D signal reception timing adjustment value ⁇ '. It can be less than the divided value.
- the D2D signal reception timing adjustment value ⁇ 'and the timing advance indicator ⁇ correspond one-to-one.
- the UE may signal the TA command from the eNB through the SA as closely as possible, and may enjoy the average error of the receiving UEs.
- a TA value that can be represented by a TA field in an SA is larger than a TA command value received from an eNB and determined to be the closest value and signaled.
- This method intentionally informs the advanced timing when the receiving UE removes the CP length from the front of the OFDM symbol in the process of removing the CP. This is to prevent ISKinter symbol interference.
- a TA value that can be represented by a TA field in an SA is smaller than a TA command value received from an eNB and determined to be the closest value and signaled. This method is to prevent the ISI by intentionally informing the back timing when the receiving UE removes the CP length from the back of the OFDM symbol in the process of removing the CP.
- FIG. 6 illustrates all three schemes described above.
- numbers 1, 2, and 3 represent positions of TA values signaled by the SA when using the first, second, and third methods, respectively. That is, in FIG. 6, 1 denotes a TA value of a position closest to an actual TA command (signaled by an eNB), 2 denotes a TA value of a position closest to and larger than an actual TA command, and 3 denotes a TA value smaller than an actual TA. This is the case when a TA value is transmitted through SA.
- a combination of the above-described schemes is also possible. For example, if the difference between the actual TA and the nearest value that can be represented by the TA field in the SA is less than or equal to a predetermined level, the nearest value is selected and signaled. Method 2 or 3 may be applied to prevent ISI generated during CP removal of the receiving UE. If a semi static offset is set in each resource pool among the proposed schemes, signaling is applied by applying one of the schemes in consideration of this offset. On the other hand, in case of intentionally signaling a value different from the TA configured by the eNB described below, the TA bit field may be set and transmitted in the SA using one of the proposed methods at the other value.
- the D2DSS may need to separate the communication from the discovery, and accordingly, the D2D receiving UE may need to separately track the two D2DSS. (In particular, timing and frequency can be tracked regardless of the application.)
- the initial packet may be transmitted at DL timing and then transmitted by including a TA value received from the eNB by the Tx UE in the data packet, and may be transmitted by applying the TA after transmitting the TA packet.
- the initial transport packet format may be affected by the TA.
- the D2D communication subframe format may be divided into DL timing and PUSCH timing.
- the format if a PUSCH or PUCCH is transmitted later, leaves the area as TA behind the subframe without using it for signal mapping.
- the size of this area can be configurable. Simply, ceil or floor (TA value / symbol length) is taken and the corresponding OFDM symbol is not used.
- the maximum TA information of the sal may be signaled to the UE in advance as an upper layer signal or a physical layer signal such as an RRC.
- the UE may set the guard interval as the maximum TA reference when transmitting the aforementioned initial packet or when transmitting the D2D communication signal without TA. That is, the last partial subframe in the subframe may be empty without using the guard interval.
- a subframe for indicating a TA may be limited to a specific UL subframe (eg, a UL subframe before a DL subframe).
- the D2D communication subframe may be limited to only consecutive UL subframes before the DL subframe.
- the subframe for indicating the TA may follow the DL timing or have a fixed offset (624Ts ⁇ 20us), and if the DL timing has the DL timing, the guard interval for Tx / Rx switching in the last region of the subframe If it has a fixed offset of 624Ts, it can be transmitted without a guard interval.
- the TA value transmitted in the SA field may be set based only on a value of a TA command received from an eNB or a cumulative value of a TA command value.
- the TA command value or the cumulative value of the TA command value, or the values corresponding to the granularity that can be transmitted in the SA The modified value is transmitted through the SA, and the UEs which receive the D2D signal are set based on the time when the TA value included in the SA is applied at the time of receiving the D2D synchronization signal from the synchronization source.
- the D2D synchronization signal also has an offset of 624Ts, it is possible to accurately grasp when the D2D data starts.
- a packet indicating a TA needs to be transmitted periodically like a D2DSS. In some cases, it may need to be transmitted at a higher frequency. This is because UEs receiving D2D packets in the middle cannot properly receive the TA.
- the packet that tells the TA value It may be transmitted in a format such as D2DSS. For example, D2DSS is transmitted to an area excluding a guard interval in a format using DL timing among subframe formats.
- the first subframe of a specific D2D signal resource pool may be set to a subframe through which the D2DSS is transmitted.
- the PD2DSCH includes a field indicating that the usage is different from the discovery's D2DSS, or is different from the discovery's D2DSS.
- a D2DSS using a sequence or structure can be sent.
- the eNB signals TA or TA related information (average TA in the sal, maximum TA or minimum TA, TA range) to the D2D transmit / receive UE as a physical layer or higher layer signal. You may.
- the subframe format at that time may be set based on the maximum TA.
- transmission may be performed after the subframe of + n is applied to the time point at which the TA is applied.
- the format may use the format when TA is applied. UEs receiving this may also perform reception in a changed format from that time.
- the granularity is illustrated as 512 when an 11-bit TA is transmitted through a SA.
- the TA resolution (minimum time granularity indicated by the TA bit) may vary as described below. That is, in the following description, when the TA received by the D2D transmitting UE is transmitted to the D2D receiving UE, when the number of TA bits received from the eNB and the number of bits included in the SA are different, the bits included in the SA are interpreted. Can be considered.
- the resolution of the existing l ibit TA corresponds to about 0.521us.
- the value indicated by the bit included in the SA may follow the resolution of the existing 11bit TA. If X bits (x ⁇ ll) are included in the SA, the existing resolution can be followed.
- the TA information may be transmitted in the PD2DSCH or D2D data (for example, TA is transmitted through another separate channel again with n bit resolution). have. Or rough TA information may be signaled by the eNB.
- the pattern in which the SA is sent indicates a specific TA state. Can be used for purposes. For example, assuming that there are N time / frequency patterns in which SAs are transmitted, [log2N] TA states may be displayed. This TA state is used to inform the approximate TA value and estimate the correct TA through the bits included in the SA.
- the newly defined resolution may be used.
- the maximum cell radius or the maximum TA value in the cell may be signaled to the UE as a physical layer or a higher layer signal or predetermined.
- the D2D transmitting UE may use as many resolutions as the value of the TA corresponding to this maximum radius divided by 2x.
- the receiving UE may perform FFT by shifting the reception degree using the newly defined resolution of the bit indicated by the SA at its DL timing.
- the resolution of the TA indicated by the bit included in the SA may be a unit of the CP length or a value linked to the CP length.
- TA may be indicated via SA with a resolution of normal CP or extended CP length (or a times normal CP / extended CP length, a is a preset value between 0 and 1, for example a is 0.5).
- the CP length used by the resolution may be indicated by a physical layer or higher layer signal (e.g., SIB, (E) PDCCH, higher layer signal (RRC)) from the eNB, or a specific CP length (e.g., For example, it may be determined as an extended CP).
- SIB SIB
- E E
- RRC higher layer signal
- the UE that receives the TA may perform the FFT by shifting the reception degree to a resolution of CP length through a bit included in the SA at its DL reception timing. .
- the pattern on which the SA is transmitted may be used to indicate a specific TA state. For example, assuming that there are N time / frequency patterns in which SAs are transmitted, [log2N] TA states may be displayed. This TA state is used to inform the approximate TA value, and the correct TA is estimated through the bits included in the SA.
- the time resolution of the TA included in the SA may be set in whole or in part of the proposed method.
- the TA resolution set may be predetermined or may be signaled as an upper layer signal or a physical layer signal such as an RRC.
- the TA resolution set may be set to a specific value.
- the TA resolution set may be set to a specific value in advance, or the physical compromise or higher layer signal of the eNB (eg, SIB, (E) PDCCH, RRC signaling).
- resolution in extended CP length (512 * Ts, For example, a value obtained by applying a predetermined scaling factor a to 16.7 ⁇ , or CP length, where a may be predetermined as a resolution set that can be set. In this set, the UE may be set to a specific value in advance, or a specific value may be indicated within a predetermined set by signaling of the eNB.
- TA resolution (16 * Ts, e.g. 0.52 us
- resolution in units of normal CP length (144 * Ts, e.g.
- a TA resolution (16 * Ts, e.g. 0.52 us)
- a third resolution (e.g. a resolution set based on the maximum TA of the aforementioned cell) is set to a configurable TA resolution set
- the eNB may signal a specific value.
- the third resolution value may be delivered to the UE in advance by signaling such as RRC or SIB.
- the value of the time resolution of the TA included in the SA may be directly indicated by a physical layer or a higher layer signal of the eNB. In this case, a case or part using different resolution values in different cells is used. If the network coverage needs to be delivered to the UE out of coverage, a method of delivering it is needed. As a solution to this, the UE transmitting the D2D synchronization signal (D2DSS) may transmit a time resolution value of the TA in a D2D physical layer signal such as PD2DSCH. Alternatively, the time resolution value of the TA may be transmitted as an upper layer signal to the D2D data channel.
- D2DSS D2D synchronization signal
- the time resolution set value of the TA may be set to a value separate from the CP length for D2D (for example, 16Ts).
- information about the TA resolution is separately provided for signaling for setting the CP length for the D2D. It may be signaled by a physical layer or higher layer signal of the eNB.
- r is 320. If this is expressed as CP length, it can be expressed as 0.625 (5/8) * extended CP length (512Ts).
- the TA resolution may be determined by the number of bits signaled by the SA for a specific cell radius, and the network may signal the TA resolution of the current eNB rather than signaling the TA resolution, and thus the UE may infer the TA resolution. It is also possible. A set of cell radiuses supported by this modification is set in advance, and a specific value within a cell radius set that can be indicated according to the cell radius of the current eNB can be signaled to the UE as a physical layer or a higher layer signal.
- a TA resolution set for a set of supporting cell radii is preset, and a specific value in a TA resolution set that can be indicated according to the cell radius of the current eNB may be signaled to the UE as a physical layer or a higher layer signal.
- the UE receiving the TA may change its operation according to its RRC state.
- the receiving UE in the RRC idle mode may find an approximate receiving timing position using one of the above-described TA resolution values as the TA value transmitted by the transmitting UE through the SA, and correlate the DMRS to estimate the correct receiving timing.
- the RRC connected mode UE may estimate the correct FFT degree timing by taking DMRS correlation based on its TA, not the TA transmitted by the transmitting UE.
- the FFT raw point of view may be roughly determined (for example, by taking an average) using both its TA and the TA value transmitted by the transmitting UE, and DMRS correlation may be taken based on this to estimate an accurate FFT raw point of view.
- a reception time may be approximately set by averaging its TA value and the timing value indicated to the transmitting UE, rather than the TA transmitted by the transmitting UE. If it is certain that the D2D signal receiving UEs are all in RRC connected mode, the transmitting UE may not transmit a separate TA value in the SA and the TA bit field in the SA may be used for other purposes.
- the TA bit field may include RV information of HARQ or TPC information between D2D UEs. have. If the transmitting UE does not use TA, 1) the TA field is not transmitted to the SA, or 2) the TA field may be set to a specific state (for example, all zero or all one) and used for virtual CRC. Or 3) When the TA field is not used (when both transmitting and receiving UEs use TA or when both transmitting and receiving UEs do not use TA), the TA field is used for transmitting other information or existing transmission. It can be used to confirm the information. For example, the redundancy version may be transmitted to the SA using the TA field. The remaining TA field indicating the RV may be used for transmitting another information, or may be fixed to a specific state and used for virtual CRC.
- TA resolution may be adaptively used depending on a range of TA values. For example, when a 6-bit TA field is included in the SA, a total TA range of 64 steps can be set. In this case, if TA value is within 64 * 16Ts, 16Ts is used as TA resolution, if TA value is greater than 64 * 16Ts and 144Ts * 64, 144Ts is used as TA resolution and TA value is greater than 144 * 64Tx There is 512Ts as the ⁇ resolution. The operation of this adaptive ⁇ resolution change may be cell specific or UE-specific.
- the eNB may set a TA resolution based on the maximum TA in the cell and signal the UE.
- the transmitting or receiving UE may adaptively change the resolution according to its TA value. Can be used.
- the TA granularity may be set differently for each TA state.
- the method of varying the particle size according to the state is not limited to two stages as in this example, and in general, the particle size of each state may be determined in the form of a table in advance.
- the granularity setting for each TA state may be predetermined, or may be signaled to the UE as a physical layer or a higher layer signal by the network.
- TA indicates TA at precise granularity at practical cell sizes (eg within 2 km) and approximate TA at cell sizes that are rarely used (eg at more than 2 km). This is to help the receiving UE to estimate the correct reception timing at the indicated time.
- UEs are approximately X1, X2, A, B values (granularity per state) can be set according to whether or not the ability to search the correct reception timing from the timing, each UE is to network its capability to signal these values Can be signaled as: Alternatively, the network may perform an operation of anticipating performance degradation and increasing the number of retransmissions or increasing the transmission power according to UE capability.
- the UE capability of whether correct timing can be searched based on the TA indicated by the aforementioned SA may be expressed in the form of a timing search window size based on the indicated TA. For example, if some UEs can search for + -A Ts based on the TA, and some other UEs can search for ⁇ -B Ts based on the TA, then each UE will determine this window size A, B value. You can also signal to the network.
- the window size may be extremely zero, and such a UE may assume that the UE does not perform further discovery based on the indicated TA.
- the network may appropriately set the granularity according to the TA state based on the capability of the UE or the search window size of the UE, or perform other types of change operations (increase in Tx residual power or increase in retransmission times).
- Timing advance as described above can be used in D2D communication.
- the application may be optional.
- whether TA is applied may vary depending on the transmission mode, distance from the eBN, and the like, which will be described below.
- the UE that has received the D2D communication resource configuration in the D2D communication may transmit a D2D communication signal based on the D2D communication resource configuration.
- the UE may be either (D2D) transmission mode 1 or (D2D) transmission mode 2.
- Transmission mode 1 is when the UE transmits the D2D communication signal through the resource indicated by the eNB (that is, when there is no UE selection for the communication resource)
- transmission mode 2 is a method for selecting a resource for the UE to transmit the communication signal. It may be the case. Whether TA is applied may vary depending on the transmission mode.
- the D2D communication signal when the UE transmits the D2D communication signal through a resource indicated by the eNB, the D2D communication signal is transmitted at a first timing determined from a value (NTA) indicating a timing offset between an uplink and a downlink radio frame.
- NTA value indicating a timing offset between an uplink and a downlink radio frame.
- the D2D communication signal may be transmitted at a second timing determined regardless of a value (NTA) indicating a timing offset between an uplink and a downlink radio frame.
- NTA value indicating a timing offset between an uplink and a downlink radio frame.
- the first timing may be determined from the NTA and the fixed timing advance offset (NTAoifset). That is, the first timing is (NTA + NTAoffset) * Ts, and NTA 0 ff se t is 624 in TDD and 0 in FDD.
- the first timing may be uplink timing of the UE (particularly, in the case where a radio frame which is a reference for applying TA in D2D is a downlink subframe, for example, PUSCH timing).
- the second timing may be independent of the timing advance command. Since the second timing is determined irrespective of the NTA, it is also applicable to the case where the timing advance is not known (for example, out of coverage UE, etc.).
- the second timing may be predetermined, and when it is predetermined as 0, the second timing is NTAoffset * Ts.
- the second timing may be downlink timing.
- D2D signal transmission timing may vary according to a scheduling method. TA is applied when an eNB granted resource is used, and TA is not applied when UE autonomous selection is performed.
- a transmission timing may be determined as a PUSCH timing or a downlink timing according to a transmission mode.
- Each of the transmission timings has the following advantages. have. First, when the PUSCH timing is followed, coexistence with the WAN is good. In other words, since the timing with the WAN is the same, the guard interval according to the PUSCH and the timing misalignment can be set to be the smallest. In addition, the transmission of the D2D signal using the TA has the advantage of less interference with the WAN (inter symbol interference does not occur, thereby maintaining orthogonality between carriers).
- the D2D signal is transmitted using DL timing without applying TA, there is an advantage in that the D2D signal is smoothly transmitted and received because the timing difference between the D2D transmitting terminal and the D2D receiving terminal is small when the cell radius is large.
- RRC idle UEs also have the advantage of smoothly transmitting and receiving D2D signals when the sal radius is very large.
- RRC idle UEs may also transmit communication signals. In this case, since the TA is difficult to know, the D2D communication signal may be transmitted at DL timing.
- the transmission may be initially performed without a TA, and then may be transmitted by applying an offset value linked to the TA or the TA after switching to the RRC connected mode.
- a format transmitted by DL timing and a format transmitted by applying an offset linked to a TA or a TA may be different.
- the eNB may configure a separate resource pool according to a resource selection method.
- Each resource pool may be divided into time and / or frequency domains.
- some carriers at the boundary of the resource pool may be configured to be used as guard bands because they may experience inter-carrier interference due to timing differences.
- this guard band data may not be mapped, or may be balanced in the receiver.
- transmission timing may vary depending on which scheduling method is used by an adjacent cell or cluster. Therefore, signaling may be needed to determine how adjacent cells or clusters apply.
- Indication of which pool is applying what scheduling scheme, which D2DSS is the reference can be indicated by eNB signaling or PD2DSCH, Or it may be delivered through the D2DSS sequence.
- the scheduling scheme, TA information, resource pool information, etc. of neighboring cells may be shared in the backhaul in advance and may be signaled to the UE as an upper layer signal or a physical layer signal.
- the PD2DSCH may include all or part of a scheduling scheme of each resource pool, a use of the D2DSS, a TA value applied to the D2DSS, a TA value, or a value associated with the TA value.
- the D2DSS sequence may be classified according to a scheduling method. In this case, since the UE determines resources on its own, If communication is distributed, timing sharing is possible between the two. Therefore, when a specific D2DSS sequence or format is received, it can be set to be used as a timing for discovery or distributed scheduling.
- D2D signal transmission timing and resource pool selection are connected to an eNB by signal strength (RSRP / RSRQ, (E) PDCCH BLER, synchronization signal reception capability, etc.) from the eNB. It may be determined according to the status, distance to the eNB, (C) RS detect or the like. For example, when the signal strength of the eNB is greater than or equal to a certain threshold, the D2D signal may be transmitted on a resource indicated by the eNB according to a TA or a timing offset indicated by the eNB.
- signal strength RSRP / RSRQ
- E PDCCH BLER
- synchronization signal reception capability etc.
- C RS detect or the like. For example, when the signal strength of the eNB is greater than or equal to a certain threshold, the D2D signal may be transmitted on a resource indicated by the eNB according to a TA or a timing offset indicated by the eNB.
- the D2D signal may be transmitted in the resource pool indicated by the eNB or in a preconfigured resource pool without applying TA (at a time when DL offset or a constant offset is applied to DL timing). If there are a plurality of resource pools to which TA is applied and / or a pool to which TA is not applied, each pool is classified according to signal strength from the eNB, or the transmission power strength is set for each pool in advance so that the UE is not able to use the same pool. It may be set to transmit only within the same transmission power or a preset transmission power range.
- a threshold for the transmission power used in each pool or the signal strength from the eNB may be signaled from the eNB to the UE as a physical layer or higher layer signal.
- the transmission timing of the D2D signal is determined by reusing the TA value indicated by the eNB for transmitting the PUSCH (or applying a constant offset based on the PUSCH transmission time).
- the representative TA value is preferably set by the eNB so that the D2D transmission signals of UEs placed at positions where the signal strength of the eNB is below a certain threshold are similar to the time when the general PUSCH transmission signal reaches the eNB. For example, it may be determined from a maximum TA value that may be applied to a PUSCH transmission signal in a corresponding cell.
- the UE determines the D2D transmission time as the PUSCH transmission time because the signal strength of the eNB is more than the predetermined threshold, the situation changes and the signal strength of the eNB becomes less than the predetermined threshold. In this case, it is still possible to operate to use the transmission time of the D2D signal as the existing PUSCH transmission time for a certain time. This means that the change of the position of the UE and thus the required TA value change will not be significant at least for this period of time, and even if the UE does not receive a stable TA indication for the individual UE, it can reuse the previous TA value to maximize the PUSCH. It is to align the transmission time.
- the selection of resources and timing may change according to the connection state with the eNB. For example, when an RRC connected UE wants to transmit a D2D signal, it always transmits according to the TA or an offset indicated by the eNB in a resource indicated by the eNB. When the RRC connected UE is in an RRC idle mode, the eNB indicates that Without applying the offset indicated by the TA or the eNB in the resource pool (in the case of the timing offset, the RRC idle mode may not be indicated naturally). The D2D signal may be transmitted in the corresponding resource pool. In this case, a resource region used for distributed scheduling may be separated or partially overlapped with an eNB granted scheduling resource region, and the corresponding resource regions may be configured individually or one other set of filters.
- the subset is regarded as a scheduling resource region approved by the eNB, and the transmission power is not transmitted to the region to protect the interference of the region. May transmit an operation below a predetermined level.
- the transmission timing of the D2D signal is determined by reusing the TA value indicated by the eNB for transmitting the PUSCH (or by applying a constant offset based on the PUSCH transmission time).
- the eNB If the eNB is not connected to the eNB, it is difficult for the eNB to indicate a stable TA value to the individual UE, so that the representative TA value to be applied in the corresponding conditions is broadcasted, and based on this value, the UEs can determine the transmission timing of the D2D signal. have.
- This representative TA value is preferably set by the eNB so that the D2D transmission signal of UEs that are not connected to the eNB is similar to the time when the general PUSCH transmission signal arrives at the eNB. It may be determined from the maximum TA value likely to be applied to the PUSCH transmission signal. If the UE is already connected with the eNB, the D2D is the PUSCH transmission time.
- the signal strength from the eNB is previously determined. Even if the signal is received below the signaled threshold value, when the connection state with the eNB is in the RRC-connected mode, the eNB may continuously transmit using the TA value in the resource indicated by the eNB. In this case, when the signal strength from the eNB is received below the threshold, the fact may be reported to the eNB to inform that the current connection status with the eNB is unstable.
- the resource pool can be promised to transmit without applying TA. The size of the promised time may be set in advance or the eNB may signal the D2D UE as a higher layer signal.
- a D2D UE (which is likely or likely to perform this behavior change) may signal directly or indirectly that it will change its operation in the Scheduling Assignment (SA) to inform the D2D receiving UE of this fact.
- SA Scheduling Assignment
- the direct method includes a bit, such as a motion change notice flag, in a SA and transmits a pollg 0 when transmitting continuously with the same operation and 1 when a change is expected to cause the D2D receiving UEs to predict it. Can be.
- the indirect method allows the UE receiving the UE to predict it by changing the physical layer format of the SA (for example, using a DMRS sequence / CS / OCC differently depending on flags).
- the threshold of the eNB signal for the operation that such a D2D UE changes (or possibly changes) the transmission resource setting and timing may be signaled to the D2D UE in advance as a physical layer or a higher layer signal, In the case of the out of coverage UE, a signal may be signaled by a physical layer or a higher layer signal from the in-coverage UE or a preset threshold may be used.
- the signal strength from the eNB is previously determined.
- the UE received above the signaled threshold is in the RRC-idle mode, the UE may attempt to switch to the connected mode in order to be allocated to the connection with the eNB and D2D signal transmission resources. In this case, if the connection fails for a predetermined time, the UE may transmit a D2D signal without TA in a resource or a preconfigured resource previously instructed by the eNB even if the UE is above a threshold.
- this UE when this UE subsequently succeeds in connecting with the eNB, it reports to the eNB that the threshold is exceeded but the connection with the eNB is not possible, and when the eNB sets the threshold for eNB signal strength for future D2D operation and timing change. You can make it a reference.
- the D2D transmitting UE receives the signal to the eNB. Whether or not the strength has exceeded a threshold and the received signal strength information (RSRP / RSRQ, (E) PDCCH BLER, Synch signal reception performance) may be reported as a physical layer or a higher layer signal.
- the eNB can set a threshold, the transmission mode of the D2D UEs (transmission by the eNB indication, whether the UE can decide to transmit itself, from which resource to transmit, from the resource pool) and signal transmission
- the timing (TA based transmission or DL reception timing reference) can be set.
- the thresholds of the eNB signal strength for the D2D signal transmission timing and the resource selection operation according to the signal strength from the eNB may be set differently for each mode.
- the eNB signal strength threshold is set to X dB or more in a mode in which a TA is applied and transmitted as directed by the eNB, and a Y dB or less is set in a mode to which a TA is transmitted without applying TA in a resource pool determined by the eNB. It is.
- X may be set greater than or equal to Y.
- a timer for selecting a corresponding operation may be set in the D2D signal transmission timing and resource pool selection operation according to the signal strength from the eNB. For example, if it is determined that the signal strength of the eNB did not exceed a predetermined threshold, or If the number of times that the eNB signal strength does not exceed the threshold within a certain time is less than a certain level, or if the consecutive number of detection failures of the PDCCH is more than a certain number of times, the strength of the eNB until the timer expires by operating the timer from that time. If is not to exceed the threshold is to apply the distributed scheduling based resource pool and the D2D signal transmission timing (eg, DL timing) used in the pool.
- the D2D signal transmission timing eg, DL timing
- a similar purpose timer may also be present when transitioning from using a distributed scheduling based resource pool to using an eNB scheduling based resource pool.
- a switch means that the UE is closer to the eNB than before, causing stronger interference, and thus a faster switch is necessary than the opposite case.
- the value of the timer used in comparison with the reverse switch is set to be small, or, without such a timer, the switch is made to switch from the distributed scheduling based resource pool to the eNB scheduling based resource pool as soon as the strength of the eNB signal exceeds the threshold. It may be.
- out-of-coverage UEs receive information about a resource pool later than D2DSS. For example, a pool of resources to be used out of coverage by the out-of-coverage UEs is still received before being relayed from another UE. When the received synchronization signal is received, it can be expected that the information on the resource pool will be received within a certain time. Therefore, instead of switching to the distributed scheduling mode, the information on the resource pool to be used outside the coverage is waited after waiting for a certain time. When configured, D2D transmission is performed on the resource.
- this operation is effective when the D2DSS is transmitted from a UE connected to the network and the corresponding out of coverage UEs are relatively close to the network, so that the eNB can adjust the interference resulting from the D2D transmission of such out of coverage UEs. to be.
- the UE may prohibit the D2D signal transmission or transmit the data at low power. If the resource pool to be used outside the coverage has not been received from the UE connected to the network after a certain time has elapsed, the out of coverage UE uses the resources determined by the user or a resource designated in advance to use the D2D signal.
- the resource and timing setting operation of the aforementioned UE may be separately configured.
- timing may always be configured by the eNB (or always DL timing), but the resource may be set to use a specific resource pool if it meets the above-mentioned specific conditions (e.g., signal strength of the eNB). have.
- the resource pool is used as it is depending on whether the above-mentioned specific condition is satisfied, but timing may be applied differently according to the method set by e NB. If such timing and resource selection are separated, separate thresholds for applying the timing differently and selecting resources may be set. For example, the operation of changing timing may be changed based on the X threshold, and the operation of selecting resource pull may be changed based on the y threshold.
- the resource pool and timing setting operation of the UE described above may select the resource pool differently according to the presence or absence of a TA value or the size of the TA value.
- timing information for a specific resource pool for example, whether a representative or average TA of the corresponding resource pool or TA is applied, or a timing offset to be commonly applied in the resource pool, is assigned to the physical layer or higher layer from the eNB to the UE.
- the signal may be signaled and the D2D signal transmission UE may transmit a D2D signal by selecting a resource pool according to a TA value set by the UE.
- the resource pool specific timing offset (or TA) for each resource pool or the TA range of the UE to use the pool may be set in advance or signaled from the eNB as a physical layer / high layer signal, and the transmitting UEs may The transmission resource pool is selected according to the transmission timing. This is to distinguish resources in the time domain because when the UE performs multiplexing in the frequency domain, the transmission timing may be degraded because the orthogonality is broken.
- the operation may be interpreted as dividing a resource pool according to the type of synchronization reference of a transmitting UE.
- a synchronization reference type e.g., an eNB, a UE, or a synchronization signal derived from an eNB, or a synchronization reference derived from a UE
- each resource pool may be based on a sync source ID as well as a sync reference type.
- a synchronization source ID may be signaled to each resource pool as a higher layer signal.
- a specific resource pool may use an independent synchronization source ID A
- another specific resource pool may be signaled as a physical layer or higher layer signal to the UE from the eNB to use the independent synchronization source ID B.
- “there is a rule in advance may be determined synchronization reference ID to select a value obtained by taking the operation in modeul a number of resource pools.
- a pool having an eNB (or originating from an eNB) as a synchronization reference and a pool having a UE (or originating from a UE) as a synchronization reference are distinguished from each other in the time domain, and an SA for each pool is a synchronization reference type of the pool.
- an SA for each pool is a synchronization reference type of the pool.
- whether TA is included or not (to TA) may be determined. That is, the UE transmits without including TA in the pool of which the synchronization reference is included, or is fixed to a specific value even if transmitted with the TA field included or used for other purposes, whereas the SA of the pool where eNB is a synchronization reference includes TA. The TA then transmits a value derived from the TA command received from the eNB.
- the D2D discovery cycle and the cycle of communication may be different.
- discovery may consist of several to several dozen subframes once per second, and communication may be configured in one or two subframes every 10 ms.
- a subframe in which discovery and communication overlap may occur.
- the subframe in which the UE should perform uplink transmission (for example, when it is necessary to transmit a sounding reference signal, when PUSCH transmission is indicated by DL allocation, it is round when ACK / NACK is transmitted) is D2D. It may also overlap with a subframe in which discovery or communication signals need to be transmitted.
- the D2D discovery, communication signal, or D2D synchronization signal may be transmitted in a resource area (resource pool) set or preset by an eNB.
- a resource area set or preset by an eNB.
- the type may be a plurality of types in discovery or a plurality of types in communication.
- certain types can be transmitted in TA or TA / 2, and other specific types can receive DL. Can be set to transmit with timing.
- each type of resource has a different period, as shown in FIG. 7, different types of D2D signals may be simultaneously transmitted.
- each type of resource region is divided into different frequency domains, a single carrier property cannot be satisfied during simultaneous transmission.
- simultaneous transmission of different types and types of signals may be impossible unless the transmitting terminal has multiple antennas.
- simultaneous transmission may not be possible even if different timings are set for each type. In such a case, it is necessary to set a priority for which signal to transmit.
- the D2D UE may determine a time resource for transmitting the D2D discovery signal based on the D2D discovery resource configuration.
- the determination of the time resource to transmit the discovery signal may be different depending on whether the discovery type is type 1 or type 2B.
- Discovery type 1 is a discovery signal transmission in which the UE is allowed to select a discovery resource
- discovery type 2B is a discovery signal transmission method in which discovery resources are determined by an eNB's indication.
- the signal to be transmitted in the time resource includes: a) uplink signal, b) D2D communication signal. c) may be determined as a priority of the D2D discovery signal.
- the D2D communication signal may be related to public safety. In public safety situations (eg, natural disasters, fires, emergencies), the transmission of communication signals should be given priority over discovery signals. In case of natural disaster, emergency evacuation message is transmitted through communication (especially when the eNB fails to function due to disaster, the above message must be transmitted through D2D communication). Because dropping is justified.
- a resource for transmitting a WAN signal (eg, an uplink signal) overlaps with a resource for transmitting a D2D signal
- the uplink signal should be prioritized in terms of efficiency of resource usage. That is, when it is necessary to transmit the D2D signal and the WAN signal at the same time, the WAN signal may always be transmitted with priority. For example, if the UE transmits a D2D signal in a subframe in which the UE should transmit ACK / NACK for the downlink signal, the eNB transmits the DTX. Will consider and perform the retransmission. This is a waste of resources due to unnecessary retransmissions, and is inefficient because resources used for retransmissions cannot be used for transmission for other UEs.
- the uplink signal is a sounding reference signal
- the scheduling method of the D2D signal is a method according to an eNB instruction
- the transmission timing of the D2D signal is a TA method
- the CP length of the D2D signal and the WAN are the same.
- transmission of the SRS and the D2D signal in the same subframe may be possible.
- SRS since it is a symbol, when the P2 is flattened on a D2D signal (for example, the last symbol), the SRS and the D2D signal can be transmitted in the same subframe.
- a signal having a short period may be dropped.
- This operation is a priority signal because a long period of time takes a long time to transmit again.
- the discovery signal may be transmitted with priority.
- the discovery period may be set to be longer than the communication signal, the discovery may be prioritized by waiting for a long period when the discovery is dropped when overlapping.
- a signal whose timing is a PUSCH timing (transmitting a D2D signal by applying TA) or a signal instructed to be transmitted from an eNB may be first transmitted.
- This operation gives priority to the signal indicated by the eNB when simultaneous transmission occurs between a signal arbitrarily determined by the UE and a signal indicated by the eNB.
- the signal indicated by the eNB may be a WAN signal or may be a D2D communication signal or a specific D2D signal (for example, a discovery signal allocated to a dedicated resource by the eNB).
- the Type 2B discovery signal indicated by the eNB is transmitted first, and the Type 1 discovery signal is not transmitted.
- the priority may be previously assigned by the eNB and signaled to UEs through SIB, RRC, or the like, or may be predetermined. For example, when a D2D synchronization signal needs to be transmitted simultaneously with another D2D signal, a rule may be determined to transmit the D2D synchronization with priority.
- a rule may be determined to transmit at a different time in the same resource pool or in a different type of resource pool.
- a rule may be transmitted on another type of resource (for example, type 2B) or transmitted again at another point in time of the same type of resource. Can be decided.
- the public safety D2D signal among the D2D signals may be transmitted with higher priority than other D2D signals. For example, if the same discovery signal is transmitted at the same time as a signal that is not a public safety discovery signal or a public safety discovery signal, the rule is to send the public safety discovery signal at a higher priority (or drop a non-public safety discovery signal). Can be decided.
- rules may be set in combination. For example, a rule may be determined to transmit a shorter period of a D2D signal but transmit a signal of a specific type or an eNB allocated a dedicated resource in preference to any case.
- the proposed method may be used. For example, if a specific carrier is a D2D signal transmitted from a resource indicated by the eNB, and the other carrier is a D2D signal transmitted from a resource selected by the UE, the eNB may first transmit a resource indicated by the eNB. Such a prioritization rule may be given to a specific carrier in advance. For example, when a merged transmission of D2D signals is performed or when individual D2D signals are transmitted on both carriers, priority may be given to a specific component carrier.
- D2D primary carriers For convenience, such carriers are referred to as D2D primary carriers or D2D primary cells.
- D2D Primary The carrier may be indicated by the network in advance or a carrier file selected by the UE.
- a rule for selecting a primary carrier by a specific rule may be determined in advance.
- a rule may be determined to select a carrier having a low frequency or a carrier of a public safety band as a primary carrier.
- Such a primary carrier can also be indicated as a priority allocation carrier for transmission power when simultaneous transmission of D2D signals is allowed on several carriers. For example, when a UE needs to simultaneously transmit a D2D signal on two component carriers, it first allocates transmission power to a primary CC and allocates remaining power to another carrier.
- the intraband CA there may be a difference in transmission power difference for each CC. This is because the signals of other neighboring CCs cause interference because the frequencies are close to each other. In this case, if the remaining power to be used for the other CC after the power allocation to the primary carrier does not satisfy the transmission difference constraint for each CC, the D2D signal of the carrier other than the primary carrier may be determined drop hadotok rule.
- CC1 assumes a commercial (or public safety) band, CC2: public safety or emergency call request at CC2. Then, the conditions 1), there is performed a 'D2D Mode 1 communication (commercial) or WAN signal transmitted from CC1, a case in which the emergency call occurs in CC2 must do the D2D transmit (or receive), situation 2) CC1 Is performing a D2D type 1 discovery (or mode 2 communication) transmission (or reception), but an emergency call occurs in CC2 to perform a D2D transmission (or reception), and situation 3) is a public safety in CC1. It is assumed that an emergency call occurs in CC2 to perform a D2D transmission (or reception) while performing a discovery signal or communication signal transmission (or reception) for.
- CC2 preferentially performs D2D signal transmission.
- the priority for each CC may be predetermined or may be signaled to the UE from the network as a physical layer or higher layer signal.
- priority may be given according to the type of the D2D signal.
- Public safety D2D signal transmission (or reception) always takes precedence over other commercial D2D signal transmissions.
- the difference from the operation 1 is to determine the priority according to the D2D signal type regardless of whether the CC is used or when the uses of the CC are the same.
- both CC1 and CC2 are bands that allow the transmission and reception of commercial / public safety D2D signals.
- the priority is predetermined or the D2D signal transmission priority is It may be signaled as a physical layer or higher layer signal by the network.
- Public Safety Mode 1 Communication> Public Safety Type 2 Discovery ⁇ Public Safety Mode 2 Communication ⁇ Public Safety Type 1 Discovery ⁇ commercial Mode 1 Communication> commercial Type 2 Discovery ⁇ commercial Mode 2 Communication> commercial Type 1 Discovery May be predetermined.
- the priority condition for D2D signals includes 1) signal type: communication> discovery, 2) scheduling type: eNB indication> UE autonomous, 3) service type: public safety> commercial, 4) scheduling period.
- a rule may be determined to transmit a signal in which the condition takes precedence.
- a condition that precedes the other conditions may be predetermined, or the priority of the condition may be signaled by the network.
- condition 3 public safety or commercial
- Priority Hado Tok may be predetermined.
- the above condition is merely an example, and may be predetermined as the opposite condition, another additional condition may be set, or the priority of the condition or the priority of the D2D signal may be determined by setting of the network.
- signaling may be performed to the eNB.
- CC1 is performing a commercial or public safety D2D signal or WAN signal transmission according to the eNB's instruction, and CC2 needs to perform another (public safety) D2D signal transmission from CC1, D2D due to operation in CC2 to eNB in CC1
- a signal may be transmitted indicating that signal transmission cannot be performed.
- the D2D UE may signal that it cannot transmit (or receive) the D2D signal in the future or for a predetermined time in the CC1 as a physical layer or higher layer signal.
- the network may report this from the specific UE, recognize that the resource is not used by the specific UE (for a certain time or in the future), and use the resource for other purposes.
- the UE may signal the transmission power value to be used by the UE as D2D to the eNB.
- the eNB adjusts the WAN transmission power in consideration of the UE's power class (or maximum transmission power), It can be used as a D2D.
- Priority may be set by the combination of the above operations. Priority may be set by combining operation 1 and operation 2 during the operation. For example, in a specific CC, the transmission (or reception) of a specific D2D signal may be the highest priority. As another example, while a particular CC has a higher priority than another CC, (higher priority here may mean that a predetermined offset may be applied to a signal of a specific CC at a relatively higher priority, or a specific CC Some D2D signals at may also have a higher priority than D2D signals at other CCs.) Priority conditions or rules for each D2D signal may be predetermined or may be prioritized by the network. (prioritization rule) may be indicated.
- the commercial D2D signal transmission (or reception) in CC1 Preferentially transmits the D2D signal transmission in CC1.
- This rule is based on the principle of applying the eNB resource indication first. If the eNB allocates resources, but the UE in the above-mentioned situation does not transmit the D2D signal on the resources allocated by the eNB, If the operation is prioritized, the resource allocated by the eNB in CC1 may be unusable and wasted. If the number of such UEs is not large, it may not be a big problem, but if the number of UEs increases, the amount of resources wasted may increase, resulting in inefficient use of resources.
- CC1 is a commercial use and an eNB-directed D2D signal transmission according to an eNB indication
- CC2 is a public safety use and a D2D signal transmission method (mode 2 communication or type 1 discovery) in which the UE determines resources on its own.
- a rule may be determined to prioritize the operation in CC2 based on the safety priority condition or to prioritize the operation in CC1 based on the eNB resource indication condition.
- the UE may advance if a higher priority (eg emergency call) D2D signal transmission (or reception) is requested in CC2 when a mode 2 communication is being sent in CC1 or a Type 1 discovery signal.
- a higher priority eg emergency call
- D2D signal transmission or reception
- the transmitting UE applies TA and transmits with PUSCH timing to minimize the guard interval size, and informs the receiving UE of TA or average (or maximum, minimum) TA value or TA range value so that the receiving UE can receive it. Can be.
- the receiving UE may receive a signal after searching for a D2D communication signal at the time when the TA is applied in its DL reception timing or D2DSS reception timing based on the TA.
- the D2D receiving UE may apply the TA value indicated in the SA based on the timing at which the SA of the transmitting UE is received. To this end, the D2D receiving UE may estimate the reception time of the SA using the DMRS of the SA.
- the D2D signal transmitting UE may be ruled to always transmit the D2DSS.
- the D2D signal receiving UE may set the FFT degree at the TA location indicated by the SA based on the D2DSS reception timing transmitted by the transmitting UE. In this case, it is assumed that transmission timing of the D2DSS uses DL timing.
- a D2D signal transmitting UE transmits a TA by applying a TA and sends a cell to the D2D receiving UE
- the maximum timing error between the transmitting and receiving UEs causes the maximum timing error in the two cases of FIG.
- the maximum timing error occurs when two UEs are located at the cell center.
- the maximum timing error is caused by one UE at the cell edge and one UE at the cell center. Occurs if there is.
- FIG. 8 (b) since the UE is far from the cell, the strength of the received signal is weak, so that the problem is relatively less than that of the former.
- the D2D received signal offset may be varied according to the strength or distance of the signal from the eNB.
- the eNB may set a plurality of D2D receiving UEs instead of setting only one reception offset.
- a predetermined offset or scaling factor may be introduced to apply a D2D reception signal offset different from that indicated by the eNB.
- the specific condition may be a case where the distance from the eNB, the signal quality (RSRP, RSRQ), or the like is greater than or equal to a certain threshold.
- the UE may selectively set the reception timing offset according to the distance from the eNB or the reception signal quality to perform the reception operation. For example, if the eNB sets the maximum TA value to the D2D signal reception timing offset, UEs whose distance or signal quality is below a certain threshold from the eNB apply an offset of maximum TA / 2 or 0. The set timing offset is set as it is.
- the threshold of a condition for determining the signal quality or distance from the eNB may be predetermined or may be a value configured from the eNB. When configured from the eNB, this may be signaled to the D2D UE as a physical layer or a higher layer signal.
- the transmitting UE may transmit using the TA and inform the receiving UE with a smaller value (TA / 2. Or DL timing, etc.) than the used TA.
- the maximum timing error is when the UE farthest from the timing source transmits and receives it by the UE closest to the timing source as shown in FIG.
- the timing may be increased by twice the propagation delay difference. (2D When viewed in a plane, the probability that a UE far from the sync source will transmit is greater than the probability that a UE attached near the sync source will transmit)
- the transmission timing and the timing instructing the receiving UE may be set to be different.
- the eNB intentionally sets a value smaller than the TA (in the worst case to reduce the error) to signal to the D2D receiving UE or to give a predetermined offset to the TA or TA-associated information. In addition, you can signal.
- using PUSCH timing for transmission timing can increase the number of available REs as much as possible.
- the indication timing to the receiving UE is assigned a value smaller than the TA, the timing error can be reduced in the worst case. At this time, the indication timing may be extremely zero, and in this case, a separate sync signal transmission for D2D communication is not necessary. (Shareable with Discovery)
- the indicated timing is not 0, this may be a value configured by a higher layer signal such as RRC (set by the eNB based on the maximum TA in the sal), or may be a value derived by a TA value or a TA value of a D2D transmitting UE. It may be. If the value is derived by the TA value of the D2D transmitting UE, this may be signaled by the eNB or transmitted by the D2D Tx UE included in the communication data directly (in this case, there should be a packet carrying timing information periodically or initially). In addition, a separate D2DSS for D2D communication may be transmitted.
- the eNB may instruct the transmission of the D2DSS within the coverage, and the transmission timing of the D2DSS for the D2D communication may be transmitted separately from the D2DSS for the discovery.
- the transmission timing of the D2DSS for communication may be set based on the TA value of the D2D communication Tx UE, may be set to an average TA value of transmitting UEs in a cell, or may be set based on a maximum TA value.
- the eNB instructs a specific UE to transmit a D2DSS for D2D communication
- the eNB may also indicate a transmission timing (TA or TA interworking value) of the D2DSS.
- the indication method may be signaled as a physical layer signal or a higher layer signal.
- the D2DSS transmitting UE may transmit the D2DSS at the timing indicated by the eNB or may include the corresponding timing information in the PD2DSCH.
- D2D transmitting UEs do not apply TA as they are, but use a constant offset or constant
- the transmission time can be determined by applying a ratio.
- the D2D transmitting UE that has received the TA value from the eNB may apply an offset of a to it and transmit it later than the TA.
- D2D signal transmission time is determined by applying a ratio of / b to TA. This is because, when receiving UEs receive a D2D signal without additional signaling, the receiving UEs may not be properly received due to a large difference from the TA. When following this timing, the transmitting UE may use a different format from applying TA.
- a format in which some areas are punctured at the end of a D2D subframe may be used according to a difference between TA and D2D signal transmission time points.
- the D2D receiving UE may receive a separate reception time point (offset from the DL reception time point) from the eNB as an upper layer signal such as RRC, or may perform D2D signal reception at the DL reception time point without additional signaling. If there is no separate signaling for the time of the transmitting UE, the receiving UE may not be able to accurately determine the size of the guard interval.
- the receiving UE performs energy detection and only includes the symbol in the decoding if it detects a certain threshold or more. It may be. Alternatively, only the reference signal may be mapped in the guard period. In this case, the RS may be used for demodulation only when the RS reception quality is greater than or equal to a predetermined threshold.
- the D2D signal transmitting UE transmits the D2D signal by applying a predetermined offset or scaling factor to the TA
- information on the offset or scaling factor applied to the TA or the information is provided to the D2D receiving UE.
- the (reflected) specific offset value included may be signaled.
- an eNB may indicate an offset value of up to TA / 2 to the receiving UE. This is to indicate the earliest time arrival time according to the D2D signal transmission time because the earliest time signal arrival time may be changed according to the offset or scaling applied to the transmitting UE.
- the eNB may instruct the D2D receiving UE to apply the offset to the maximum TA.
- FIG. 11 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 includes a receiving module 11, The transmission modules 12, the processor 13, the memory 14, and the plurality of antennas 15 may be included.
- the plurality of antennas 15 means a transmission point apparatus that supports MIMO transmission and reception.
- the receiving modules 11 may receive various signals, data, and information on uplink from the terminal.
- the transmission modules 12 may transmit various signals, data, and information on downlink to the terminal.
- the processor 13 may control the operation of the overall transmission point apparatus 10.
- the processor 13 of the transmission point apparatus 10 may process necessary items in the above-described embodiments.
- the processor 13 of the transmission point apparatus 10 performs a function of processing information received by the transmission point apparatus 10, information to be transmitted to the outside, and the memory 14 is computed.
- Information and the like may be stored for a predetermined time, and may be replaced with a component such as a buffer (not shown).
- the terminal device 20 includes a reception module 21, a transmission module 22, a processor 23, a memory 24, and a plurality of antennas 25. ) May be included.
- the plurality of antennas 25 mean a terminal device that supports MIMO transmission and reception.
- the receivers 21 may receive various signal data and information on the downlink from the base station.
- the transmission modules 22 may transmit various signals, data, and information on the uplink to the base station.
- the processor 23 may control the operation of the entire terminal device 20.
- the processor 23 of the terminal device 20 may process necessary items 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, and the memory 24 includes arithmetic processing information. It may be stored for a predetermined time, it may be replaced by a component such as a buffer (not shown).
- the description of the transmission point apparatus 10 is described. The same may be applied to the relay apparatus as the downlink transmitting entity or the uplink receiving subject, and the description of the terminal device 20 may be equally applied to the relay apparatus as the downlink receiving entity or the uplink transmitting entity.
- embodiments of the present invention can 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 comprises one or a ⁇ "a (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), (Digital Signal Processing Devices) DSPDs ASICs, Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- a Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs ASICs Programmable Logic Devices
- FPGAs Field Programmable Gate Arrays
- the method according to the embodiments of the present invention may be implemented in the form of modules, procedures, or functions 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.
- Embodiments of the present invention as described above may be applied to various mobile communication systems.
Abstract
Description
Claims
Priority Applications (5)
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KR1020167019472A KR20160114067A (ko) | 2014-01-28 | 2015-01-28 | 무선 통신 시스템에서 장치 대 장치 단말의 신호 송수신 방법 및 장치 |
JP2016548686A JP6386061B2 (ja) | 2014-01-28 | 2015-01-28 | 無線通信システムにおいて装置対装置端末の信号送受信方法及び装置 |
CN201580006235.4A CN105940621B (zh) | 2014-01-28 | 2015-01-28 | 在无线通信系统中设备对设备终端收发信号的方法和装置 |
EP15743619.7A EP3101823B1 (en) | 2014-01-28 | 2015-01-28 | Method and apparatus for device-to-device terminal for tranceiving signal in wireless communication system |
US15/111,694 US10172152B2 (en) | 2014-01-28 | 2015-01-28 | Method and apparatus for device-to-device UE for transceiving signal in wireless communication system |
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PCT/KR2015/000901 WO2015115791A1 (ko) | 2014-01-28 | 2015-01-28 | 무선 통신 시스템에서 장치 대 장치 단말의 신호 송수신 방법 및 장치 |
PCT/KR2015/000904 WO2015115794A1 (ko) | 2014-01-28 | 2015-01-28 | 무선 통신 시스템에서 장치 대 장치 단말의 제어 채널 전송 방법 및 장치 |
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PCT/KR2015/000904 WO2015115794A1 (ko) | 2014-01-28 | 2015-01-28 | 무선 통신 시스템에서 장치 대 장치 단말의 제어 채널 전송 방법 및 장치 |
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EP (2) | EP3101823B1 (ko) |
JP (2) | JP6386061B2 (ko) |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105940621A (zh) | 2016-09-14 |
CN105940735B (zh) | 2019-08-16 |
CN105940742A (zh) | 2016-09-14 |
KR20160114067A (ko) | 2016-10-04 |
KR102345347B1 (ko) | 2021-12-30 |
US10172152B2 (en) | 2019-01-01 |
CN105940621B (zh) | 2019-03-29 |
EP3101823B1 (en) | 2021-10-27 |
JP6346295B2 (ja) | 2018-06-20 |
CN105940742B (zh) | 2019-11-01 |
JP6386061B2 (ja) | 2018-09-05 |
JP2017510151A (ja) | 2017-04-06 |
EP3101962B1 (en) | 2020-08-05 |
WO2015115794A1 (ko) | 2015-08-06 |
EP3101823A1 (en) | 2016-12-07 |
EP3101962A1 (en) | 2016-12-07 |
JP2017510146A (ja) | 2017-04-06 |
US20160337839A1 (en) | 2016-11-17 |
KR20160114066A (ko) | 2016-10-04 |
KR20160114065A (ko) | 2016-10-04 |
EP3101962A4 (en) | 2017-10-11 |
US20160338021A1 (en) | 2016-11-17 |
US20160345348A1 (en) | 2016-11-24 |
CN105940735A (zh) | 2016-09-14 |
WO2015115791A1 (ko) | 2015-08-06 |
EP3101823A4 (en) | 2017-08-30 |
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