WO2013191518A1 - 기기-대-기기 통신을 위한 스케줄링 방법 및 이를 위한 장치 - Google Patents
기기-대-기기 통신을 위한 스케줄링 방법 및 이를 위한 장치 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/18—Interfaces between hierarchically similar devices between terminal devices
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a scheduling method for device-to-device (D2D) communication and an apparatus therefor.
- D2D device-to-device
- Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- HARQ-ACK Hybrid ARQ Acknowledgement
- resource allocation information indicating a subframe set for device-to-device (D2D) communication from a base station Receiving; Receiving D2D data in subframe #n from another terminal; And transmitting HARQ-ACK information on the D2D data, and if subframe # (n + k) corresponds to the subframe set for D2D communication, the HARQ-ACK information is the subframe # (n and when the subframe # (n + k) does not correspond to the subframe set for D2D communication, the HARQ-ACK is the subframe for the D2D communication after the subframe # (n + k).
- a terminal configured to perform a hybrid automatic repeat reQuest (HARQ) operation in a wireless communication system
- the terminal comprising: a radio frequency (RF) unit; And a processor, wherein the processor receives resource allocation information indicating a subframe set for device-to-device communication from a base station, receives D2D data in subframe #n from another terminal, and receives the D2D data.
- RF radio frequency
- the HARQ-ACK information is transmitted in the subframe # (n + k)
- the HARQ-ACK is selected from among subframes belonging to the subframe set for D2D communication after the subframe # (n + k).
- a terminal transmitted in the subframe closest to the subframe # (n + k) is provided.
- the scheduling information for the D2D data may be received from the other terminal.
- the resource allocation information may include first information indicating a first frequency resource region, and the scheduling information indicates a second frequency resource region allocated in a state where the first frequency resource region is regarded as a full band. It includes the second information, the number of bits of the first information may be more than the number of bits of the second information.
- the scheduling information for the D2D data may be transmitted to the other terminal.
- the resource allocation information may include first information indicating a first frequency resource region, and the scheduling information indicates a second frequency resource region allocated in a state where the first frequency resource region is regarded as a full band. It includes the second information, the number of bits of the first information may be more than the number of bits of the second information.
- the resource allocation information further includes information indicating the k value.
- control information can be efficiently transmitted in a wireless communication system.
- scheduling information may be efficiently transmitted in a system supporting device-to-device communication, and resources for this may be efficiently managed.
- FIG. 1 illustrates physical channels used in a 3GPP LTE (-A) system, which is an example of a wireless communication system, and a general signal transmission method using the same.
- -A 3GPP LTE
- SC-FDMA Single Carrier Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- 3 illustrates a structure of a radio frame.
- FIG. 4 illustrates a resource grid of a downlink slot.
- 5 shows a structure of a downlink subframe.
- FIG. 6 shows an example of allocating a physical downlink control channel (PDCCH) to a data region of a subframe.
- PDCCH physical downlink control channel
- RS 7 illustrates a downlink reference signal (RS) pattern.
- DM-RS DeModulation Reference Signal
- UE-specific RS DM-RS
- FIG. 11 illustrates a system that supports device-device (eg, terminal-terminal) links.
- device-device eg, terminal-terminal
- FIG. 15 illustrates a base station and a terminal that can be applied to an embodiment in the present invention.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) employs OFDMA in downlink and SC-FDMA in uplink as part of Evolved UMTS (E-UMTS) using E-UTRA.
- LTE-A Advanced is an evolution of 3GPP LTE.
- a terminal receives information through a downlink (DL) from a base station, and the terminal transmits information through an uplink (UL) to the base station.
- the information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist according to the type / use of the information transmitted and received.
- FIG. 1 is a diagram for explaining physical channels used in a 3GPP LTE (-A) system and a general signal transmission method using the same.
- the terminal which is powered on again or enters a new cell while the power is turned off performs an initial cell search operation such as synchronizing with the base station in step S101.
- the terminal receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and provides information such as cell identity (cell identity). Acquire.
- the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain broadcast information in a cell.
- PBCH physical broadcast channel
- the terminal may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
- DL RS downlink reference signal
- the UE After completing the initial cell discovery, the UE receives a physical downlink control channel (PDSCH) according to physical downlink control channel (PDCCH) and physical downlink control channel information in step S102 to be more specific.
- PDSCH physical downlink control channel
- PDCCH physical downlink control channel
- System information can be obtained.
- the terminal may perform a random access procedure such as steps S103 to S106 to complete the access to the base station.
- the UE transmits a preamble through a physical random access channel (PRACH) (S103), a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Can be received (S104).
- contention resolution procedure such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106). ) Can be performed.
- the UE After performing the above-described procedure, the UE performs a general downlink control channel / physical downlink shared channel reception (S107) and a physical uplink shared channel (PUSCH) / as a general uplink / downlink signal transmission procedure.
- Physical uplink control channel (PUCCH) transmission (S108) may be performed.
- the control information transmitted from the terminal to the base station is collectively referred to as uplink control information (UCI).
- UCI includes Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK (HARQ ACK / NACK), Scheduling Request (SR), Channel State Information (CSI), and the like.
- HARQ ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK
- SR Scheduling Request
- CSI Channel State Information
- the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indication (RI), and the like.
- CQI Channel Quality Indicator
- PMI Precoding Matrix Indicator
- RI Rank Indication
- UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data should be transmitted at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.
- the 3GPP system employs OFDMA in downlink and SC-FDMA in uplink.
- both a terminal for uplink signal transmission and a base station for downlink signal transmission include a serial-to-parallel converter 401, a subcarrier mapper 403, and an M-point IDFT module. 404 and CP addition module 406 are identical.
- the terminal for transmitting a signal in the SC-FDMA method further includes an N-point DFT module 402.
- the N-point DFT module 402 partially offsets the IDFT processing impact of the M-point IDFT module 404 so that the transmitted signal has a single carrier characteristic.
- LTE supports a type 1 radio frame structure for frequency division duplex (FDD) and a type 2 radio frame structure for time division duplex (TDD).
- FDD frequency division duplex
- TDD time division duplex
- the downlink / uplink radio frame consists of 10 subframes, and the subframe consists of two slots in the time domain.
- the subframe may have a length of 1 ms
- the slot may have a length of 0.5 ms.
- the slot includes a plurality of OFDM symbols (or SC-FDMA symbols) in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
- the LTE (-A) system uses OFDMA in downlink and SC-FDMA in uplink.
- the RB is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot.
- the type 2 radio frame consists of two half frames, and the half frame consists of five subframes.
- the subframe consists of two slots.
- a subframe in a radio frame is set to D, U, or S according to an UL-DL configuration (Uplink-Downlink Configuration).
- D denotes a downlink subframe
- U denotes an uplink subframe
- S denotes a special subframe.
- the special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS is a time interval reserved for downlink transmission
- UpPTS is a time interval reserved for uplink transmission.
- FIG. 4 illustrates a resource grid of a downlink slot.
- the downlink slot includes a plurality of OFDM symbols in the time domain.
- One downlink slot may include 7 (6) OFDM symbols, and a resource block (RB) may include 12 subcarriers in the frequency domain.
- Each element on the resource grid is referred to as a resource element (RE).
- One RB contains 12x7 (6) REs.
- the number of RBs included in the downlink slot NRB depends on the downlink transmission band.
- the structure of an uplink slot is the same as that of a downlink slot, but an OFDM symbol is replaced with an SC-FDMA symbol.
- 5 illustrates a structure of a downlink subframe.
- up to three (4) OFDM symbols located in the first part of the first slot of a subframe correspond to a control region to which a control channel is allocated.
- the remaining OFDM symbols correspond to data regions to which the Physical Downlink Shared CHance (PDSCH) is allocated.
- the downlink control channel includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and the like.
- the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe.
- the PHICH carries a HARQ-ACK (Hybrid Automatic Repeat reQuest Acknowledgment) signal in response to uplink transmission.
- HARQ-ACK is a result of a reception response for downlink transmission (eg, a Physical Downlink Shared Channel (PDSCH) or a Semi-Persistent Scheduling release Physical Downlink Control Channel (SPDCH)), that is, Acknowledgment (ACK) / Negative ACK. ) / DTX (Discontinuous Transmission) response (simply, ACK / NACK response, ACK / NACK, A / N response, A / N).
- a / N means ACK, NACK, DTX or NACK / DTX.
- PDSCH may be replaced by a transport block or codeword.
- DCI downlink control information
- the DCI format has formats 0, 3, 3A, 4, and formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, and 2C defined for uplink.
- the DCI format uses a hopping flag, RB allocation, Modulation Coding Scheme (MCS), Redundancy Version (RV), New Data Indicator (NDI), Transmit Power Control (TPC), and DeModulation Reference Signal (DMRS) depending on the application. And optionally include information such as a cyclic shift, a CQI request, a HARQ process number, a transmitted precoding matrix indicator (TPMI), a precoding matrix indicator (PMI), and the like.
- MCS Modulation Coding Scheme
- RV Redundancy Version
- NDI New Data Indicator
- TPC Transmit Power Control
- DMRS DeModulation Reference Signal
- the PDCCH includes a transmission format and resource allocation information of a downlink shared channel (DL-SCH), a transmission format and resource allocation information of an uplink shared channel (UL-SCH), a paging channel (Paging CHannel, Resource allocation information of upper-layer control messages such as paging information on PCH), system information on DL-SCH, random access response transmitted on PDSCH, Tx power control command set for individual terminals in terminal group, Tx power control command , The activation instruction information of the Voice over IP (VoIP).
- a plurality of PDCCHs may be transmitted in the control region.
- the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted on an aggregation of one or a plurality of consecutive Control Channel Elements (CCEs).
- CCEs Control Channel Elements
- the CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
- the CCE corresponds to a plurality of resource element groups (REGs).
- the format of the PDCCH and the number of PDCCH bits are determined according to the number of CCEs.
- the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
- the CRC is masked with an identifier (eg, Radio Network Temporary Identifier (RNTI)) according to the owner or purpose of use of the PDCCH.
- RNTI Radio Network Temporary Identifier
- an identifier eg, Cell-RNTI (C-RNTI)
- C-RNTI Cell-RNTI
- P-RNTI Paging-RNTI
- SI-RNTI system information RNTI
- RA-RNTI random access-RNTI
- the FDD DL carrier and TDD DL subframes use the first n OFDM symbols of the subframe for transmission of PDCCH, PHICH, PCFICH, etc., which are physical channels for transmitting various control information, and the remaining OFDM symbols. Used for PDSCH transmission.
- the number of symbols used for control channel transmission in each subframe is delivered to the UE dynamically or semi-statically through RRC signaling through a physical channel such as PCFICH.
- the n value may be set from 1 symbol up to 4 symbols according to subframe characteristics and system characteristics (FDD / TDD, system bandwidth, etc.).
- PDCCH which is a physical channel for transmitting DL / UL scheduling and various control information in the existing LTE system
- PDCCH has limitations such as transmission through limited OFDM symbols.
- the LTE-A system additionally introduces an enhanced PDCCH (E-PDCCH), which is more freely multiplexed using PDSCH and FDM.
- E-PDCCH enhanced PDCCH
- FIG. 6 shows an example of allocating a downlink physical channel to a subframe.
- a control region (see FIG. 5) of a subframe may be allocated a PDCCH (Legacy PDCCH, L-PDCCH) according to the existing LTE.
- the L-PDCCH region means a region to which a legacy PDCCH can be allocated.
- the L-PDCCH region may mean a control region, a control channel resource region (ie, a CCE resource) to which a PDCCH can be actually allocated in the control region, or a PDCCH search space.
- a PDCCH may be additionally allocated in a data region (eg, a resource region for PDSCH, see FIG. 5).
- the PDCCH allocated to the data region is called an E-PDCCH.
- E-PDCCH As shown, by additionally securing control channel resources through the E-PDCCH, scheduling constraints due to limited control channel resources in the L-PDCCH region may be relaxed.
- the E-PDCCH carries a DCI.
- the E-PDCCH may carry downlink scheduling information and uplink scheduling information.
- the E-PDCCH / PDSCH process and the E-PDCCH / PUSCH process are the same / similar to those described with reference to steps S107 and S108 of FIG. 1. That is, the terminal may receive the E-PDCCH and may receive data / control information through a PDSCH corresponding to the E-PDCCH.
- the UE may receive the E-PDCCH and transmit data / control information through a PUSCH corresponding to the E-PDCCH.
- a PDCCH candidate region (hereinafter, referred to as a PDCCH search space) is reserved in a control region in advance and a method of transmitting a PDCCH of a specific terminal to a portion thereof is selected. Accordingly, the UE may obtain its own PDCCH in the PDCCH search space through blind decoding. Similarly, the E-PDCCH may also be transmitted over some or all of the pre-reserved resources.
- RS 7 illustrates a downlink reference signal (RS) pattern of an LTE system.
- RSs are defined for a unicast service in an LTE system.
- Terminal-specific RS is also referred to as dedicated RS (DRS).
- the UE-specific RS is used only for data demodulation and the CRS is used for both channel information acquisition and data demodulation.
- the CRS is a cell-specific signal and is transmitted every subframe over the full band. Since the LTE system supports up to four transmit antennas in downlink, CRSs for up to four antenna ports may be transmitted according to the number of transmit antennas of the base station.
- the CRS for each antenna port is multiplexed by frequency division multiplexing (FDM) in the RB.
- FDM frequency division multiplexing
- MBSFN subframe is a subframe configured for multicast / broadcast signal transmission.
- the MBSFN subframe may be set periodically.
- the CRS is transmitted only through the first and second OFDM symbols, and the terminal for which the MBSFN service is not configured does not ignore or receive the data area.
- DM-RS DeModulation Reference Signal
- the DM-RS is a UE-specific RS used to demodulate a signal of each layer when transmitting a signal using multiple antennas.
- DM-RS is used for demodulation of PDSCH. Since the LTE-A system considers up to eight transmit antennas, up to eight layers and respective DM-RSs are required.
- the DM-RS in the DM-RS, two or more layers share the same RE and multiplexed in a CDM (Code Division Multiplexing) scheme.
- the DM-RS for each layer is spread using spreading codes (eg, orthogonal codes such as Walsh codes and DFT codes) and then multiplexed onto the same RE.
- SF Spreading Factor
- the DM-RS for layer 0 may be spread using [+1 +1], and the DM-RS for layer 1 may be spread using [+1 ⁇ 1].
- DM-RSs for layers 2 and 3 are spread on the same RE using different orthogonal codes.
- DM-RSs for layers 4, 5, 6, and 7 are spread with codes orthogonal to existing layers 0, 1, 2, and 3 on the REs occupied by DM-RSs 0 and 1, and 2 and 3.
- the antenna port for DM-RS is ⁇ 7,8,... , n + 6 ⁇ (n is the number of layers)
- FIG 9 illustrates a structure of an uplink subframe used in LTE (-A).
- the subframe 500 is composed of two 0.5 ms slots 501. Assuming the length of a Normal Cyclic Prefix (CP), each slot consists of seven symbols 502 and one symbol corresponds to one SC-FDMA symbol.
- the resource block (RB) 503 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain.
- the structure of an uplink subframe of LTE (-A) is largely divided into a data region 504 and a control region 505.
- the data area means a communication resource used in transmitting data such as voice and packet transmitted to each terminal, and includes a PUSCH (Physical Uplink Shared Channel).
- PUSCH Physical Uplink Shared Channel
- the control region means a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each terminal, a received ACK / NACK for an uplink signal, an uplink scheduling request, and a PUCCH (Physical Uplink). Control Channel).
- the sounding reference signal (SRS) is transmitted through an SC-FDMA symbol located last on the time axis in one subframe. SRSs of multiple terminals transmitted in the last SC-FDMA of the same subframe can be distinguished according to frequency location / sequence.
- the base station selects a terminal to transmit data for each transmission time interval (TTI) (eg, subframe).
- TTI transmission time interval
- the base station selects terminals to transmit data in uplink / downlink for each TTI and selects a frequency band used by the terminal for data transmission.
- UEs transmit reference signals (or pilots) in uplink, and the base station determines the channel state of the UEs using the reference signals transmitted from the UEs in each unit frequency band for each TTI.
- the base station informs the terminal of this result. That is, the base station transmits an uplink assignment message for transmitting data using a specific frequency band to an uplink scheduled terminal in a specific TTI.
- the uplink assignment message is also referred to as a UL grant.
- the terminal transmits data in the uplink according to the uplink assignment message.
- the uplink allocation message may include a UE ID, RB allocation information, a Modulation and Coding Scheme (MCS), a Redundancy Version (RV) version, a New Data Indicator (NDI), and the like.
- MCS Modulation and Coding Scheme
- RV Redundancy Version
- NDI New Data Indicator
- the retransmission time is systematically promised (eg, 4 subframes after the NACK reception time). Therefore, the UL grant message transmitted from the base station to the terminal only needs to be transmitted during initial transmission, and subsequent retransmission is performed by an ACK / NACK signal (eg, PHICH signal).
- the base station since the retransmission time is not promised to each other, the base station should send a retransmission request message to the terminal.
- the retransmission request message may include a terminal ID, RB allocation information, HARQ process index, RV, NDI information.
- the UL HARQ scheme uses synchronous non-adaptive HARQ.
- the HARQ process number is given from 0 to 7.
- One HARQ process operates per TTI (eg, subframe).
- the base station 110 transmits a UL grant to the terminal 120 through the PDCCH (S600).
- the terminal 120 transmits uplink data to the base station S110 using the RB and MCS designated by the UL grant after 4 subframes (eg, subframe 4) from the time point (eg, subframe 0) at which the UL grant is received. It transmits (S602).
- the base station 110 generates ACK / NACK after decoding uplink data received from the terminal 120. If decoding on the uplink data fails, the base station 110 transmits a NACK to the terminal 120 (S604). The terminal 120 retransmits uplink data after 4 subframes from the time point of receiving the NACK (S606). Initial transmission and retransmission of uplink data is in charge of the same HARQ processor (eg, HARQ process 4). ACK / NACK information may be transmitted through PHICH.
- D2D communication illustrates a wireless communication system supporting device-to-device (D2D) communication.
- D2D communication a communication scheme in which data is directly transmitted and received between terminals without passing through a base station (although some control from the base station is involved) is referred to as D2D communication or terminal-terminal communication.
- UE2 UE2 may directly communicate with UE1 UE1 via a network (eg, a base station) (terminal-terminal communication / link).
- UE2 UE2 may communicate with other UEs through the eNB according to the existing scheme (terminal-base station link / communication).
- the present invention proposes a scheduling process for D2D communication, accompanying D2D resource allocation, and a D2D signal modulation and demodulation scheme.
- TD Transmitting Device
- RD Receiving Device
- PDCCH includes both existing L-PDCCH and E-PDCCH, and can be interpreted according to the context.
- the base station may provide information and / or parameters necessary for D2D communication to terminals (eg, UE1 and UE2) configured to perform D2D communication ((a) 1, (b) 1). Thereafter, actual scheduling for D2D communication may be performed in two ways.
- the first scheme is similar to the conventional DL scheduling scheme, and the TD (UE1) may transmit information necessary for scheduling to the RD (UE2) ((a) 2) and transmit corresponding D2D data ((a)). 3).
- the second method is similar to the existing UL scheduling method, and TD (UE1) may receive information necessary for scheduling from RD (UE2) ((b) 2) and transmit corresponding D2D data ((b)). 3).
- 2 process may be omitted in the method shown in accordance with the implementation method. That is, the base station provides all the information and / or parameters necessary for the D2D communication (1), the TD can transmit the corresponding D2D data to the RD (UE2) (3).
- the base station may transmit the D2D scheduling information to the TD / RD using a PDSCH (hereinafter, referred to as a D2D-sch PDSCH).
- the D2D scheduling information may include, for example, an identification (TD ID), an RD ID, a resource allocation (RA), a modulation and coding scheme (MCS), a transport block (TB) size, a trasmission power control (TPC) command, and an A / N. It may include at least some of the resource information.
- the RA may include information regarding a D2D data transmission resource and may further include information (eg, subframe offset / index) related to a time point of performing a D2D data transmission / reception operation.
- the subframe offset for transmitting and receiving D2D data may be applied based on the RA receiving subframe (index).
- the A / N resource information includes A / N transmission resource information for D2D reception and may further include information (eg, subframe offset / index) related to A / N feedback transmission time for D2D reception.
- the subframe offset for A / N transmission may be applied based on the D2D data transmission / reception subframe (index) or the RA reception subframe (index).
- the D2D-sch PDSCH and the PDCCH scheduling it may be detected / decoded by a plurality of (potential) D2D UEs.
- the corresponding PDCCH may be scrambled based on RNTIs (commonly referred to as D2D-RNTIs) commonly allocated to a plurality of D2D UEs.
- the PDSCH may include D2D scheduling information for a plurality of terminals.
- D2D scheduling information for a plurality of terminals may be transmitted through a medium access control (MAC) protocol data unit (PDU).
- MAC medium access control
- the MAC PDU may include a MAC header and a MAC payload
- the MAC header may include a plurality of MAC subheaders
- the MAC payload may include a plurality of D2D scheduling information corresponding to the MAC subheader.
- Each MAC subheader may include a D2D UE ID (eg, TD ID, RD ID).
- the base station informs the TD / RD of the SF set information (and / or MCS / TB size) capable / allowed D2D signal transmission through the PDSCH, and the actual D2D such as RA (and / or MCS / TB size).
- the scheduling information may signal the TD to the RD through the specific SF in the corresponding D2D SF set (ie, as the base station transmits the DL grant to the UE for DL data scheduling).
- the D2D data may be transmitted from the TD to the RD through an SF in which corresponding D2D scheduling information is signaled or a specific SF thereafter.
- the base station informs the TD / RD of the SF set information (and / or MCS / TB size) capable / allowed D2D signal transmission through the PDSCH, and the actual (eg, RA (and / or MCS / TB size)).
- the D2D scheduling information may signal the RD to the TD through the specific SF in the corresponding D2D SF set (that is, as the base station transmits the UL grant to the UE for UL data scheduling).
- the D2D data is transmitted from the TD to the RD through SF # (n + k0) or a specific SF (eg, the first SF in the SF set).
- SF # n + k0
- a specific SF eg, the first SF in the SF set.
- This method may be suitable for a situation in which a burden on resource usage and overhead associated with D2D scheduling is less, or a dynamic / adaptive change is required for resources and parameters required for D2D data transmission.
- the base station may transmit primary D2D scheduling information (hereinafter, referred to as D2D schd-info-1) to the TD / RD using (i) PDCCH or (ii) PDSCH (similar to the scheme (a)).
- D2D schd-info-1 primary D2D scheduling information
- the PDCCH or the PDCCH scheduling the PDSCH may be scrambled based on a common RNTI (eg, D2D-RNT).
- the TD uses secondary D2D scheduling information (hereinafter, D2D schd-info-2) based on D2D schd-info-1 using a specific control signal / channel (eg, a control signal / channel similar to PDCCH).
- the TD may transmit D2D data corresponding to the RD.
- the corresponding D2D data may be transmitted from the TD to the RD through an SF signaled after the D2D scheduling information or a specific SF thereafter.
- the RD forwards the D2D schd-info-2 to the TD using a specific control signal / channel (e.g., a control signal / channel similar to a PDCCH) based on the D2D schd-info-1, and then the TD. May transmit D2D data corresponding to the RD.
- a specific control signal / channel e.g., a control signal / channel similar to a PDCCH
- D2D schd-info-2 is transmitted in SF #n
- the D2D schd-info-1 may include (in whole or in part) limited information such as TD ID, RD ID, RA-1, and A / N resource information.
- RA-1 may provide allocation information for a resource area (which may include the entire system BW) that is larger than the (frequency) resource to be used for actual D2D data transmission.
- the RA-1 may further include D2D data / control signal transmission / reception time point information.
- D2D schd-info-2 may include limited information (in whole or in part) such as RA-2, MCS / TB size, TPC command, and the like.
- the RA-2 may provide allocation information on resources to be used for actual D2D data transmission in a resource region (eg, a frequency resource region) allocated by the RA-1.
- a resource region eg, a frequency resource region allocated by the RA-1.
- the D2D UE regards the resource region allocated by RA-1 as the entire band for the D2D communication, and may renumber the resource index for the D2D communication accordingly.
- the number of bits required for resource allocation can be reduced by considering the allocated resource region as a whole band for D2D communication.
- a control signal / channel (eg, PDCCH-2) including D2D schd-info-2 is transmitted through a resource region allocated by RA-1, and D2D data is transmitted by RA-2 in D2D schd-info-2. It may be transmitted through an allocating resource (existing in the resource area allocated by RA-1).
- PDCCH-2 and D2D data may be TDM (at symbol level or SF level similar to L-PDCCH / PDSCH) and / or FDM (similar to E-PDCCH / PDSCH or PUCCH / PUSCH) on a subframe. Can be sent.
- RA-1 may transmit only D2D data / control signal transmission / reception time point (time) information
- RA-2 may allocate D2D data transmission / reception (frequency) resource information at the corresponding time point.
- a base station does not know a TD-to-RD transmission link state (for example, CSI)
- a TD-to-RD transmission link state for example, CSI
- only a certain resource area / point is allocated for D2D communication, and actual D2D scheduling (for D2D data transmission) is performed.
- RA / MCS / TPC, etc.) and transmission may be suitable for scenarios in which the TD / RD performs itself.
- the base station presets D2D scheduling control information (semi-statically) to D2D UEs using higher layer signaling (such as RRC / Radio Access Control (MAC) / Medium Access Control (MAC)) and at a specific time point.
- a control signal / channel (hereinafter referred to as a D2D trigger) that triggers (dynamically) D2D communication may be delivered to the TD / RD.
- the D2D trigger is a PDCCH type based on the same / similar to the DCI format for DL / UL grant (eg, 0 / 1A), the DCI format for UL PC (power control) (eg, 3 / 3A), or (PUSCH PHICH can be reused for D2D trigger purposes.
- the PDCCH used for the D2D trigger may be scrambled based on a common RNTI (eg, D2D-RNTI).
- the D2D trigger When the D2D trigger is in the form of a grant PDCCH, RA, A / N resource information (+ MCS / TB size), etc. (in whole or in part) may be included in the D2D scheduling control information configured through higher layer signaling, and the D2D trigger Only limited information (in whole or in part), such as a TD / RD ID and a TPC command (+ MCS / TB size), may be included within. Meanwhile, when the D2D trigger is in the form of PDCCH or PHICH for PC, the RA, MCS / TB size, A / N resource information, etc. may all be included in the D2D scheduling control information configured through higher layer signaling, and the D2D trigger may include D2D.
- the PC PDCCH includes power control information of a plurality of terminals, and power control information for each terminal is provided using a bit value corresponding to each terminal in a bitmap. Therefore, in case of PDCCH-based D2D trigger for PC, 2 bits in one PDCCH scrambled based on a specific D2D-RNTI are each set as a flag indicating TD / RD (eg, ON / OFF) or different from each other.
- One bit in each PDCCH scrambled based on two D2D-RNTIs may be set as a flag indicating whether a TD / RD is used. If both the TD / RD is OFF, it may be considered that there is no triggering for D2D communication.
- two different PHICH resources may be set as a flag indicating whether each TD / RD is used.
- a / N modulation on each PHICH resource may be used for ON / OFF signaling.
- the base station may perform D2D triggering at a specific point in time while preconfiguring TD / RD with SF set information (and / or MCS / TB size) capable of / allowing D2D signal transmission through higher layer signaling.
- actual D2D scheduling information such as RA (and / or MCS / TB size) may be transmitted to the RD through the specific SF in the D2D SF set (i.e., as the base station transmits the DL grant to the UE for DL data scheduling).
- the corresponding D2D data may be transmitted from the TD to the RD through the SF in which the D2D scheduling information is signaled or a specific SF thereafter.
- the base station may perform D2D triggering at a specific point in time while preconfiguring TD / RD with SF set information (and / or MCS / TB size) capable of / allowing D2D signal transmission through higher layer signaling.
- SF set information and / or MCS / TB size
- actual D2D scheduling information such as RA (and / or MCS / TB size) may be transmitted to the TD through a specific SF in the D2D SF set (ie, as the base station transmits a UL grant to the UE for UL data scheduling). ) Can be signaled.
- SF signaled by the D2D scheduling information is assumed to be SF #n
- the change of D2D data transmission resources and parameters may be relatively intermittent, or may be suitable for a situation in which the burden on resource usage and overhead associated with D2D scheduling is high.
- the base station may consider to explicitly inform the TD / RD of the D2D data transmission time and / or information related to the A / N feedback transmission time for the D2D reception through the PDCCH. .
- D2D communication may be overhead to dynamically signal D2D data transmission time and / or information related to A / N feedback transmission time for D2D reception each time.
- BD blind decoding
- the base station delivers the D2D scheduling control information each time for D2D data retransmission.
- the RD may send the A / N feedback to the TD and reuse the automatic retransmission timing in the existing 3GPP Rel-10.
- the existing retransmission method since there is no A / N feedback transmission to the base station in D2D communication, when the existing retransmission method is used, the base station cannot know when the D2D data transmission will succeed, so the retransmission resource should be kept empty without allocating to other terminals. . Therefore, if the existing retransmission scheme is used as it is in D2D communication, there is a problem of increasing the scheduling constraints for other terminals (not participating in the D2D communication) to the base station.
- the D2D data / feedback transmission time point may enable not only the TD / RD performing the actual D2D communication but also other (potential D2D) terminals (eg, detection / measurement / reporting on D2D signal and interference). Purpose).
- a potential D2D candidate SF set (ie, a D2D SF set) in which D2D data (and / or control signals) and feedback transmission are likely to be performed. do.
- a UE (UE N, UE M) participating in D2D communication may receive D2D subframe set allocation information from a base station (S1302). That is, a plurality of SF sets (eg, SF sets for terminal-base station communication and SF sets for one or more D2D communication) are set in the D2D terminal, and the D2D terminal may transmit / receive D2D signals in the SF set for D2D communication. (S1304).
- SF sets eg, SF sets for terminal-base station communication and SF sets for one or more D2D communication
- a common D2D SF set or a separate D2D SF set can be set. That is, the SF set for transmitting / receiving D2D data (and / or transmitting / receiving D2D scheduling information) and the SF set for A / N feedback may be the same or may be set independently of each other.
- the SF set for D2D data transmission and reception (and / or D2D scheduling information transmission and reception) and the SF set for A / N feedback may be partially overlapped.
- the SF set for transmitting / receiving D2D data, the SF set for transmitting / receiving D2D scheduling information, or the whole or part of the SF set for A / N feedback may be the same or may be set independently of each other.
- the SF set for transmitting and receiving D2D data, the SF set for transmitting and receiving D2D scheduling information, and the whole or part of the SF set for A / N feedback may partially overlap.
- a specific SF is intentionally set to use the MBSFN, and a legacy (legacy) terminal allows a main signal (eg, CRS) and only a limited number of (1 to 2) OFDM symbol intervals in front of the corresponding SF.
- CRS main signal
- UE-specific DMRS-based which intentionally fakes to perform an operation such as detection / measurement for a channel (eg, PDCCH), and provides more improved performance to an advanced UE through the remaining sections except the corresponding symbol interval Is considering supporting DL data transfer. Therefore, it is proposed to set (use) all or part of the MBSFN SF (set) to the D2D candidate SF (set).
- the main detection / measurement operations of other terminals can be limited to a limited number of symbol intervals, and (with the rest of the intervals) without serious interference / error due to D2D signals. It is possible to configure a D2D communication (data / feedback) link.
- 14 illustrates a D2D communication process according to an embodiment of the present invention. 14 illustrates a process of performing D2D data and feedback transmission based on the D2D SF set.
- the TD / RD receives the D2D scheduling control information from the base station (eg, through PDSCH / PDCCH and D2D trigger for D2D scheduling triggering) in SF #n (eg, SF # 2).
- SF #n eg, SF # 2
- D2D data (and / or corresponding) from TD to RD via SF # (n + k1) or the closest (for data transmission) D2D SF (ie SF #m (eg SF # 4)) D2D scheduling information (including RA) and / or MCS / TB size) transmission may be performed.
- D2D data and / or corresponding
- D2D SF #m e.g. SF # 4
- D2D scheduling information including RA
- MCS / TB size e.g.
- the A / N feedback for this is SF # (m + k2) (e.g. SF # (4 + 4)) or later. It can be sent from the RD to the TD / base station via the closest (for A / N feedback) D2D SF (ie SF #h (eg SF # 16)).
- the TD receives a NACK from the RD in SF #h eg, SF # 16
- the corresponding D2D data retransmission is SF # (h + k3) (eg, SF # (16 + 4)) or later.
- the D2D scheduling information signaling performed through SF #m and the corresponding D2D data transmission process may be configured in the following manner.
- the RD signals the TD the D2D scheduling information including the RA (and / or the MCS / TB size), and then the SF # (m + k5) or the next D2D SF # m1 to the corresponding information.
- independent D2D for the sole purpose of performing detection / measurement / reporting only for D2D signals and interferences (or subsets of those SF sets) separately from D2D data (and / or control signals) and D2D SF sets for feedback.
- the discovery SF set may be set (via higher layer signaling such as broadcast / RRC).
- the D2D signal and interference through SF #g when receiving a control signal / channel instructing detection / measurement of the D2D signal and interference through SF #g, the D2D signal and interference through SF # (g + k4) or the next closest D2D discovery SF.
- Detection / measurement can be performed (k4 is a positive integer (eg, k4> 0)).
- the UE provides a periodic signal / channel (eg, periodic SRS, periodic CSI) in which transmission is set / reserved in the D2D discovery SF set.
- a periodic signal / channel eg, periodic SRS, periodic CSI
- PUCCH for transmitting PUCCH for transmitting SR, PUSCH scheduled according to SPS
- / or PUSCH automatically retransmitted (non-adaptive based on PHICH NACK only) through a corresponding D2D discovery SF set. You can omit / abandon the transmission.
- the UE may further include a grant (eg, an UL grant scheduling a PUSCH transmission) and / or a command (eg, a PDCCH order commanding a RACH preamble transmission) to schedule a signal / channel to be transmitted in the D2D discovery SF set.
- a grant eg, an UL grant scheduling a PUSCH transmission
- a command eg, a PDCCH order commanding a RACH preamble transmission
- it may operate in the state that it is not expected or assumed that the grant (eg, DL grant scheduling PDSCH transmission) that causes HARQ-ACK PUCCH transmission in the D2D discovery SF set is not transmitted.
- the UE may skip the DL grant PDCCH reception process for the SF whose HARQ-ACK transmission timing corresponds to the D2D discovery SF set, or ignore or decode the PDSCH corresponding to the PDCCH even if the DL grant PDCCH is received. . Meanwhile, the UE skips the UL grant PDCCH reception process for the SF whose PUSCH transmission timing corresponds to the D2D discovery SF set or performs the reception process for the UL grant PDCCH, but the transmission time of the PUSCH corresponding to the UL grant PDCCH is D2D. When included in the discovery SF set, the PUSCH transmission is dropped.
- a grant and / or command for scheduling a signal / channel to be transmitted in a specific D2D discovery SF and / or a grant causing HARQ-ACK PUCCH transmission in a specific D2D discovery SF is detected / received.
- the D2D signal detection / measurement in a specific D2D discovery SF may be omitted, and the SF may be operated in a state in which the SF is assumed / regarded as a general SF not set as the D2D discovery SF.
- the signal / channel processing operation may be applied to the D2D SF set configured for D2D data transmission and reception and / or D2D scheduling information transmission and / or D2D reception A / N feedback.
- the terminal supporting the D2D operation may further include an OFDM transmitting module and / or an SC-FDM receiving module for D2D communication according to a category / capability in addition to the OFDM receiving module and the SC-FDM transmitting module for communication with the base station. It may include. If the hardware specification (eg, power amplifier characteristics) of the terminal is sufficiently stable, a D2D communication link operating based on OFDM transmission and reception may be more efficient. In addition, it may be necessary to support D2D communication even for a low-end terminal configured only with the OFDM reception / SC-FDM transmission module as before.
- an OFDM transmitting module and / or an SC-FDM receiving module for D2D communication according to a category / capability in addition to the OFDM receiving module and the SC-FDM transmitting module for communication with the base station. It may include. If the hardware specification (eg, power amplifier characteristics) of the terminal is sufficiently stable, a D2D communication link operating based on OFDM transmission and reception may be more efficient. In addition, it may be
- the UE may transmit information (eg, an FFT (Fast Fourier Transform)) to a specification (eg, an OFDM transmission module and / or an SC-FDM reception module) added for D2D purposes in addition to the basic specification (OFDM reception / SC-FDM transmission module). Size) can be informed to the base station.
- the applicable bandwidth of the added OFDM transmission / SC-FDM reception module may be smaller than the applicable BW of the basic OFDM reception / SC-FDM transmission module.
- whether to apply OFDM modulation and demodulation (eg PDSCH or PDCCH / PDSCH if considering transmission of scheduling control information on the D2D link as in the above method (b)) to transmit and receive D2D data on the D2D communication link.
- Broadcast / RRC / L1 (Layer 1) / L2 (Layer 2) whether to apply FDM modulation / demodulation (e.g., PUSCH or PUCCH / PUSCH) if considering transmission of scheduling control information on a D2D link as in the scheme (b). ) May be cell-specific or terminal-specific.
- a method of indicating which modulation and demodulation scheme to apply in the PDSCH / PDCCH for D2D scheduling triggering and the D2D trigger is also possible.
- the OFDM modulation and demodulation scheme may be applied
- the D2D triggering PDCCH is based on the UL grant DCI format
- the SC-FDM modulation and demodulation scheme may be applied.
- the OFDM modulation and demodulation scheme may be applied when the D2D data transmission and reception is instructed through the DL SF
- the SC-FDM modulation and modulation scheme may be applied when the D2D data transmission and reception are indicated through the UL SF.
- CP configuration information for D2D signal transmission may be set through broadcast / RRC / L1 / L2 signaling or may be indicated through PDSCH / PDCCH and D2D trigger for D2D scheduling triggering.
- the CP configuration information may indicate whether to apply CP length information, for example, a normal / extended CP, and / or a specific CP added to D2D only (eg, shorter than normal CP).
- the start / end timing information of the D2D signal transmission in the D2D (discovery) SF (for example, the symbol position / index where the D2D signal transmission starts / ends in the corresponding SF) is transmitted through broadcast / RRC / L1 / L2 signaling. It may be configured or indicated through PDSCH / PDCCH and D2D trigger for D2D scheduling triggering.
- symbol indices n and m in D2D (discovery) SF may be set / indicated as starting / ending points of D2D signal transmission, respectively (0 ⁇ n ⁇ K, 0 ⁇ m ⁇ K, n ⁇ m).
- n is equal to or less than a specific value (eg, , 0)
- the transmission / reception of all or some (last) symbols in the SF immediately before the corresponding D2D SF may be restricted / omitted.
- m is set to a specific value or more (eg, K)
- transmission / reception of all or some of the symbols in the SF immediately after the corresponding D2D SF may be restricted / omitted.
- the D2D data / control signal may be transmitted between the base station and (other) UE by a common reference signal (CRS) / CSI-RS (Channel State Information Reference Signal) and / or a DMRS (Demodulation Reference). Signaling may be rate-matched for RE or Resource Element (RE) or OFDM symbols that may be included.
- the D2D data / control signal may be rate-matched for a RE or SC-FDM symbol that may include / include a Sounding Reference Signal (SRS) and / or DMRS transmission.
- SRS Sounding Reference Signal
- the DMRS for receiving / demodulating the D2D signal includes a time base and / or a DMRS in 3GPP Rel-10 for avoiding interference with other terminals (communicating with the base station). Or it may be arranged so as not to overlap on the frequency axis.
- 3GPP Rel-10 in case of a normal CP-based UL SF, a PURS DMRS is disposed in a fourth SC-FDM symbol in each slot, and SC-FDM modulation / demodulation based D2D data transmission and reception are performed through the corresponding UL SF.
- the D2D DMRS may be disposed in a third or fifth SC-FDM symbol (for example, among remaining symbols except for the fourth symbol) in each slot.
- the DMRS for receiving / demodulating D2D signals may be in a form in which some symbols are omitted from the DMRS structure in 3GPP Rel-10.
- one SC-FDM symbol is arranged as a DMRS for PUSCH in each slot, and SC-FDM modulation and demodulation-based D2D data transmission and reception are performed through the corresponding UL SF.
- the DMRS for D2D may be placed in only one specific slot (for example, the first or the second).
- D2D scheduling control information (transmitted through PDSCH / PDCCH and D2D trigger or the like or preset through RRC) includes D2D data transmission / retransmission allowance duration and SF set or allow transmission. Number of retransmissions (ie, maximum reTx), and the like.
- the received TD / RD may transmit / retransmit D2D data only within the duration / SF set or only for the maximum number of reTx.
- the RD may transmit A / N feedback for receiving D2D data to a base station (ie, an A / N-to-base station) or a TD (A / N-to-TD).
- the base station may signal to the TD (in case of A / N-to-base station) or the TD (in case of A / N-to-TD) to the base station. Through this, the TD may reuse the unused SF within the received duration / SF set / maximum reTx for communication with the base station. In addition, the base station may reassign the unused SF in the duration / SF set / maximum reTx to another terminal.
- the base station or the terminal may be replaced with a relay.
- the base station terminal shown in the terminal terminal link may be replaced with a terminal terminal.
- a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120.
- Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116.
- the processor 112 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112.
- the RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal.
- the terminal 120 includes a processor 122, a memory 124, and an RF unit 126.
- the processor 122 may be configured to implement the procedures and / or methods proposed by the present invention.
- the memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122.
- the RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal.
- the base station 110 and / or the terminal 120 may have a single antenna or multiple antennas.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. 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 components or features of one embodiment may be included in another embodiment or may be replaced with corresponding 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.
- embodiments of the present invention have been mainly described based on data transmission / reception relations between a terminal and a base station.
- Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station.
- a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
- the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.
Abstract
Description
Claims (12)
- 무선 통신 시스템에서 단말이 HARQ-ACK(Hybrid ARQ Acknowledgement) 정보를 전송하는 방법에 있어서,기지국으로부터 D2D(Device-to-Device) 통신용 서브프레임 세트를 지시하는 자원 할당 정보를 수신하는 단계;다른 단말로부터 서브프레임 #n에서 D2D 데이터를 수신하는 단계; 및상기 D2D 데이터에 대한 HARQ-ACK 정보를 전송하는 단계를 포함하되,서브프레임 #(n+k)가 상기 D2D 통신용 서브프레임 세트에 해당하는 경우, 상기 HARQ-ACK 정보는 상기 서브프레임 #(n+k)에서 전송되고,상기 서브프레임 #(n+k)가 상기 D2D 통신용 서브프레임 세트에 해당하지 않는 경우, 상기 HARQ-ACK은 상기 서브프레임 #(n+k) 이후에 상기 D2D 통신용 서브프레임 세트에 속한 서브프레임 중에서 상기 서브프레임 #(n+k)과 가장 가까운 서브프레임에서 전송되는 방법.
- 제1항에 있어서,상기 다른 단말로부터 상기 D2D 데이터에 대한 스케줄링 정보를 수신하는 단계를 더 포함하는 방법.
- 제2항에 있어서,상기 자원 할당 정보는 제1 주파수 자원 영역을 지시하는 제1 정보를 포함하고, 상기 스케줄링 정보는 상기 제1 주파수 자원 영역을 전 대역으로 간주한 상태에서 할당된 제2 주파수 자원 영역을 지시하는 제2 정보를 포함하며,제1 정보의 비트 수는 제2 정보의 비트 수보다 많은 방법.
- 제1항에 있어서,상기 다른 단말에게 상기 D2D 데이터에 대한 스케줄링 정보를 전송하는 단계를 더 포함하는 방법.
- 제4항에 있어서,상기 자원 할당 정보는 제1 주파수 자원 영역을 지시하는 제1 정보를 포함하고, 상기 스케줄링 정보는 상기 제1 주파수 자원 영역을 전 대역으로 간주한 상태에서 할당된 제2 주파수 자원 영역을 지시하는 제2 정보를 포함하며,제1 정보의 비트 수는 제2 정보의 비트 수보다 많은 방법.
- 제1항에 있어서,상기 자원 할당 정보는 상기 k 값을 지시하는 정보를 더 포함하는 방법.
- 무선 통신 시스템에서 HARQ(Hybrid Automatic Repeat reQuest) 동작을 수행하도록 구성된 단말에 있어서,무선 주파수(Radio Frequency, RF) 유닛; 및프로세서를 포함하고,상기 프로세서는 기지국으로부터 D2D(Device-to-Device) 통신용 서브프레임 세트를 지시하는 자원 할당 정보를 수신하고, 다른 단말로부터 서브프레임 #n에서 D2D 데이터를 수신하며, 상기 D2D 데이터에 대한 HARQ-ACK 정보를 전송하도록 구성되며,서브프레임 #(n+k)가 상기 D2D 통신용 서브프레임 세트에 해당하는 경우, 상기 HARQ-ACK 정보는 상기 서브프레임 #(n+k)에서 전송되고,상기 서브프레임 #(n+k)가 상기 D2D 통신용 서브프레임 세트에 해당하지 않는 경우, 상기 HARQ-ACK은 상기 서브프레임 #(n+k) 이후에 상기 D2D 통신용 서브프레임 세트에 속한 서브프레임 중에서 상기 서브프레임 #(n+k)과 가장 가까운 서브프레임에서 전송되는 단말.
- 제7항에 있어서,상기 프로세서는 또한 상기 다른 단말로부터 상기 D2D 데이터에 대한 스케줄링 정보를 수신하도록 구성되는 단말.
- 제8항에 있어서,상기 자원 할당 정보는 제1 주파수 자원 영역을 지시하는 제1 정보를 포함하고, 상기 스케줄링 정보는 상기 제1 주파수 자원 영역을 전 대역으로 간주한 상태에서 할당된 제2 주파수 자원 영역을 지시하는 제2 정보를 포함하며,제1 정보의 비트 수는 제2 정보의 비트 수보다 많은 단말.
- 제7항에 있어서,상기 프로세서는 또한 상기 다른 단말에게 상기 D2D 데이터에 대한 스케줄링 정보를 전송하도록 구성된 단말.
- 제10항에 있어서,상기 자원 할당 정보는 제1 주파수 자원 영역을 지시하는 제1 정보를 포함하고, 상기 스케줄링 정보는 상기 제1 주파수 자원 영역을 전 대역으로 간주한 상태에서 할당된 제2 주파수 자원 영역을 지시하는 제2 정보를 포함하며,제1 정보의 비트 수는 제2 정보의 비트 수보다 많은 단말.
- 제7항에 있어서,상기 자원 할당 정보는 상기 k 값을 지시하는 정보를 더 포함하는 단말.
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CN104396173B (zh) | 2018-11-16 |
KR102138532B1 (ko) | 2020-07-28 |
US9516653B2 (en) | 2016-12-06 |
WO2013191522A1 (ko) | 2013-12-27 |
US20150181587A1 (en) | 2015-06-25 |
US20150110038A1 (en) | 2015-04-23 |
CN104396173A (zh) | 2015-03-04 |
US9918331B2 (en) | 2018-03-13 |
KR20150023326A (ko) | 2015-03-05 |
US10039121B2 (en) | 2018-07-31 |
US20170064725A1 (en) | 2017-03-02 |
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