WO2015023163A1 - Procédé d'émission de signaux dans une communication de dispositif à dispositif et appareil associé - Google Patents

Procédé d'émission de signaux dans une communication de dispositif à dispositif et appareil associé Download PDF

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Publication number
WO2015023163A1
WO2015023163A1 PCT/KR2014/007634 KR2014007634W WO2015023163A1 WO 2015023163 A1 WO2015023163 A1 WO 2015023163A1 KR 2014007634 W KR2014007634 W KR 2014007634W WO 2015023163 A1 WO2015023163 A1 WO 2015023163A1
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Prior art keywords
communication
information
resource allocation
resource
channel
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PCT/KR2014/007634
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English (en)
Korean (ko)
Inventor
이지현
서한별
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to CN201480045513.2A priority Critical patent/CN105453679B/zh
Priority to US14/912,395 priority patent/US10314092B2/en
Priority to KR1020167003228A priority patent/KR102221297B1/ko
Publication of WO2015023163A1 publication Critical patent/WO2015023163A1/fr
Priority to US16/364,858 priority patent/US10575354B2/en
Priority to US16/743,860 priority patent/US10973064B2/en

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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

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a signal transmission method and a device therefor in device-to-device communication.
  • 3 ⁇ 4 words in the cell connect to the base station to perform communication, receive control information for sending and receiving data from the base station, and then send and receive data with the base station. . That is, since the terminal transmits and receives data through the base station, in order to transmit data to another mobile terminal, the terminal transmits its data to the base station and the base station receiving the data transmits the received data to the other terminal. Since one terminal can transmit data only through a base station in order to transmit data to another terminal, the base station performs scheduling for channels and resources for data transmission and reception and transmits channel and resource scheduling information to each terminal. Send to. As such, each terminal needs channel and resource allocation for transmitting and receiving data from the base station to perform communication between terminals through the base station. It has a structure for transmitting and receiving signals.
  • the present invention is to propose a method for efficiently supporting resource allocation for device-to-device communication in a wireless communication system.
  • a method for allocating a resource of a terminal configured to perform device to device (Devi ce-to-Devi ce) communication in a wireless communication system serving Receiving information on all available resource areas of the D2D communication from the base station to the base station to request the resource allocation to use for the D2D communication based on the information on the all available resource areas and the channel information of the D2D communication Transmitting and receiving resource allocation information for the D2D communication determined based on the request for resource allocation from the serving base station.
  • the method may further include transmitting assistance information for resource allocation of the D2D communication to the serving base station, wherein the assistance information is a resource utilization ratio for the D2D communication. Also, it may include at least one of information about avoidance or preference for the D2D communication, or channel state and interference of the D2D communication.
  • the method may further comprise receiving the updated resource allocation information of the D2D communication determined based on the assistance information.
  • At least one of information on the entire available resource area of the D2D communication, the request for resource allocation, or the resource allocation information increase may be in bitmap format.
  • the channel information of the D2D communication may include at least one of a traffic load, a channel state, or an interference amount of the D2D communication channel.
  • the request for resource allocation may include information about a D2D operation mode divided into D2D transmission or D2D reception.
  • the method may further include transmitting a resource allocation re-request to the serving base station.
  • D2D A method for allocating resources of a terminal configured to perform communication, the method comprising the steps of: transmitting information on the entire available resource area of the D2D communication to the terminal, the total available A request for resource allocation to be used for the D2D communication based on information on a resource region and channel information of the D2D communication to the terminal; And receiving resource allocation information for the D2D communication determined on the basis of the request for resource allocation.
  • the method may further include receiving assistance information for resource allocation of the D2D communication from the terminal, wherein the assistance information is a resource utilization ratio for the D2D communication. It may further include at least one of avoided or preferred resources for D2D communication, or information about channel state and interference of the D2D communication.
  • the method may further include determining updated resource allocation information of the D2D communication based on the assistance information, and transmitting the determined resource allocation information to the terminal. have.
  • At least one of information on the entire available resource area of the D2D communication, the request for resource allocation, or the resource allocation information may be in bitmap format.
  • the channel information of the D2D communication may include at least one of a traffic load, a channel state, or an interference amount of the D2D communication channel.
  • the request for resource allocation includes information on a D2D operation mode divided into D2D transmission or D2D reception.
  • the method may further include receiving a resource allocation re-request to the serving base station.
  • a terminal configured to perform device-to-device (D2D) communication in a wireless communication system according to an embodiment of the present invention, wherein the terminal is a radio frequency (RF). unit; And a processor configured to control the RF unit, wherein the processor receives information on a total available resource area of the D2D communication from a serving base station, information on the total available resource area, and channel information of the D2D communication. Transmits a request for resource allocation to be used for the D2D communication based on the to the base station, and receives resource allocation information for the D2D communication determined based on the request for resource allocation from the serving base station.
  • RF radio frequency
  • FIG. 1 illustrates an example of a radio frame structure used in a wireless communication system.
  • FIG. 2 shows an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
  • FIG 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.
  • uplink (upl ink, UL) subframe structure used in a 3GPP LTE / LTE-A system.
  • FIG. 5 illustrates a device-to-device communication scheme according to an embodiment of the present invention.
  • FIG. 6 illustrates an example of a transmission or reception operation that may be performed by a terminal supporting device-to-device communication.
  • 7 and 8 are examples of resource configuration for device to device communication.
  • 9 illustrates an example of interference between device-to-device communication and base station-to-terminal communication according to an embodiment of the present invention.
  • 10 shows an example of signaling of a terminal when multi-cluster transmission is configured according to an embodiment of the present invention.
  • 11 and 12 are examples of signaling between a base station and a terminal according to an embodiment of the present invention.
  • FIG. 13 is a flowchart illustrating an operation according to an embodiment (s) of the present invention.
  • Figure 14 shows a block diagram of an apparatus for implementing embodiment (s) of the present invention.
  • a user equipment may be fixed or mobile, and various devices for transmitting and receiving user data and / or various control information by communicating with a base stat ion (BS). Belong to this.
  • UEs include Terminal Equipment, MSCMobi Le Stat Ion, Mobi Le Terminal (MT), UTC User Terminal (UTC), Subscriber Stat Ion (SS), Wireless Device, Personal Digital Assistant (PDA), and Wireless Modem. It may be called a wireless modem or a handheld device.
  • the BS generally refers to a fixed station that communicates with the UE and / or another BS, and communicates with the UE and another BS to exchange various data and control information.
  • the BS may be referred to in other terms such as ABS (Advanced Base Stat ion), NB (Node-B), eNB (evolved-NodeB), BTSCBase Transceiver System (BS), Access Point (Access Point), PSC Processing Server (BS).
  • BS is collectively referred to as eNB.
  • a node refers to a fixed point capable of transmitting / receiving a radio signal by communicating with a user equipment.
  • Various forms of eNBs may be used as nodes regardless of their name.
  • the node may be a BS, an NB, an eNB, a pico-cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, and the like.
  • the node may not be an eNB.
  • it may be a radio remote head (RRH) or a radio remote unit (RRU). ⁇ , RRU, etc. generally have a power level lower than the power level of the eNB (power level). Since RRH or RRU or below, RRH / RRU is generally connected to eNB by dedicated line such as optical cable, it is generally compared to cooperative communication by eNBs connected by wireless line. And cooperative communication by the eNB can be performed smoothly.
  • RRH radio remote head
  • RRU radio remote unit
  • At least one antenna is installed at one node.
  • the antenna may mean a physical antenna, or may mean an antenna port, a virtual antenna, or an antenna group.
  • Nodes are also called points.
  • Antennas are centrally located at the base station and controlled by a single eNB controller to control the conventional ionized centralized antenna system (CAS) (i.e., single node system).
  • CAS conventional ionized centralized antenna system
  • a plurality of nodes are typically located at more than a certain interval apart.
  • the plurality of nodes may control the operation of each node, or one or more eNB blacks that schedule data to be transmitted / received through each node may be managed by an eNB controller.
  • Each node may be connected to an eNB or eNB controller managing the node through a cable or dedicated line.
  • the same cell identifier (ident i ty ID) may be used or different cell IDs may be used to transmit / receive signals to / from a plurality of nodes.
  • each of the plurality of nodes behaves like some antenna group of one cell.
  • this multi-node system may be referred to as a multi-cell (eg, macro-cell / femto-cell / pico-cell) system.
  • the network formed by the multiple cells is particularly called a multi-layer network.
  • the cell ID of the RRH / RRU and the cell ID of the eNB may be the same or may be different.
  • both the RRH / RRU and the eNB operate as independent base stations.
  • one or more eNBs or eNB controllers connected to a plurality of nodes may simultaneously transmit or receive signals to the UE through some or all of the plurality of nodes. You can control multiple nodes.
  • Node systems are different from single node systems (eg CAS, conventional MIM0 systems, conventional relay systems, conventional repeater systems). Accordingly, embodiments of the present invention regarding a method for performing data cooperative transmission using some or all of a plurality of nodes may be applied to various types of multi-node systems. For example, although a node generally refers to an antenna group spaced apart from another node by more than a predetermined interval, embodiments of the present invention described later may be applied to a case in which the node means any antenna group regardless of the interval.
  • the eNB may control the node configured as the H-pol antenna and the node configured as the V-pol antenna, and embodiments of the present invention may be applied. have.
  • a signal is transmitted / received through a plurality of transmit (Tx) / receive (Rx) nodes, a signal is transmitted / received through at least one node selected from a plurality of transmit / receive nodes, or a downlink signal
  • a communication scheme for differentiating a node transmitting an uplink signal from a node receiving an uplink signal is called multi-eNB MIMO or CoMP (Coordinated Mult i-Point TX / RX).
  • Cooperative transmission schemes among such cooperative communication between nodes can be largely classified into JP (joint processing) and scheduling coordinat ion.
  • JT joint transmission
  • fR joint recept ion
  • DPS dynamic point select ion
  • CS coordinated scheduling
  • CB coordinated beamforming
  • DCS dynamic cel l select ion
  • JT in JP refers to a communication scheme in which a plurality of nodes transmit the same stream to the UE
  • JR refers to a communication scheme in which a plurality of nodes receive the same stream from the UE.
  • the UE / eNB synthesizes signals received from the plurality of nodes to recover the stream.
  • JP DPS refers to a communication technique in which a signal is transmitted / received through a node selected according to a specific rule among a plurality of nodes.
  • DPS since a node having a good channel state between the UE and the node will be generally selected as a communication node, the reliability of signal transmission can be improved.
  • a cell cel l refers to a certain geographic area in which one or more nodes provide a communication service. Therefore, in the present invention, communication with a specific cell may mean communication with an eNB or a node that provides a communication service to the specific cell.
  • the downlink / uplink signal of a specific cell means a downlink / uplink signal to / from an eNB or a node providing a communication service to the specific cell.
  • a cell that provides uplink / downlink communication service to a UE is particularly called a serving cell.
  • the channel state / quality of a specific cell refers to the channel state / quality of a channel or communication link formed between an eNB or a node providing a communication service to the specific cell and the UE.
  • a UE may determine a downlink channel state from a particular node on a channel CSI-RS (Channel State Informat ion Reference Signal) resource to which the antenna port (s) of the particular node is assigned to the particular node. Can be measured using the transmitting CSI—RS (s).
  • CSI-RS Channel State Informat ion Reference Signal
  • adjacent nodes transmit corresponding CSI-RS resources on CSI-RS resources orthogonal to each other.
  • Orthogonality of CSI-RS resources means that CSI-RS resources specify the symbols and subcarriers that carry the CSI-RS, CSI-RS resource configuration (resource conf igurat ion), subframe offset (of fset) and transmission period (transmission period), etc.
  • the subframe configuration (subframe conf igurat ion) that specifies the subframes to which the RS is allocated means that at least one of the CSI-RS sequences is different from each other.
  • physical downl ink control CHanneD / PCFICH Physical Control Format Indicator CHannel
  • PHICH Physical Hybrid automatic retransmit request Indicator CHannel
  • PDSCH Physical Downl ink Shared CHannel
  • DCI Downl ink
  • PUCCH Physical Upl Ink Control
  • CHannel refers to a set of time-frequency resources or a set of resource elements, each carrying an Up Ink Control Informat ion (UCI) / Uplink Data / Random Access signal.
  • UCI Up Ink Control Informat ion
  • PDCCH / PCF I CH / PH I CH / PDSCH / is assigned to a time-frequency resource or resource element (RE) assigned to or belonging to PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH, respectively.
  • PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH resource It is called PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH resource.
  • the expression that the user equipment transmits PUCCH / PUSCH / PRACH is used in the same sense as transmitting uplink control information / uplink data / random access signal on or through the PUSCH / PUCCH / PRACH, respectively.
  • the expression that the eNB transmits the PDCCH / PCFICH / PHICH / PDSCH is used in the same meaning as to transmit the downlink data / control information on or through the PDCCH / PCFICH / PHICH / PDSCH respectively.
  • Figure i (a) depicts the frame format for the 3GPP LTE / LTE-A frequency division used in the system duplex (frequency divi sion duplex, FDD),
  • Fig. 1 (b) is in the 3GPP LTE / LTE-A system, It shows the frame structure for the time division duplex (TDD) used.
  • TDD time division duplex
  • a radio frame used in a 3GPP LTE / LTE-A system has a length of 10 ms (307200. Ts), and is composed of 10 equally sized subframes (subframes, SFs). Numbers may be assigned to 10 subframes in one radio frame.
  • Each subframe has a length of 1 ms and consists of two slots. 20 slots in one radio frame may be sequentially numbered from 0 to 19.
  • Each bowl has a length of 0.5ms.
  • the time for transmitting one subframe is defined as a transmission time interval ( ⁇ ).
  • the time resource may be classified by a radio frame number (also called a radio frame index), a subframe number (also called a subframe number), a slot number (or slot index), and the like.
  • the radio frame may be configured differently according to the duplex mode. For example, in the FDD mode, since downlink transmission and uplink transmission are divided by frequency, a radio frame includes only one of a downlink subframe or an uplink subframe for a specific frequency band. Downlink transmission and uplink before in TDD mode Since the songs are separated by time, a radio frame includes both a downlink subframe and an uplink subframe for a specific frequency band.
  • Table 1 shows DL-UL configuration of subframes in a radio frame in TDD mode.
  • This (special) subframe is indicated.
  • the singular subframe includes three fields of Down Ink Pilot TimeSlot (DwPTS), Guard Period (GP), and Up Ink Pi Lot TimeSlot (UpPTS).
  • DwPTS is a time interval reserved for downlink transmission
  • UpPTS is a time interval reserved for uplink transmission.
  • Table 2 illustrates the configuration of a specific subframe.
  • FIG. 2 shows a structure of a resource grid of a 3GPP LTE / LTE-A system. There is one resource grid per antenna port.
  • a slot includes a plurality of OFDM Orthogonal Frequency Diversity symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
  • An OFDM symbol may mean a symbol period.
  • the signal transmitted in each slot is represented by ⁇ RB * i sc subcarriers.
  • ⁇ represents the number of resource blocks (RBs) in the downlink slot
  • RB represents the number of RBs in the UL slot.
  • the OFDM symbol may be referred to as an OFDM symbol or an SC-FDM symbol in accordance with a multiple access scheme.
  • the number of OFDM symbols included in one slot may vary in accordance with the channel bandwidth, the length of the CP. For example, one slot includes seven OFDM symbols in the case of a normal CP, but one slot includes six OFDM symbols in the case of an extended CP.
  • FIG. 2 illustrates a subframe in which one slot includes 7 OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having other numbers of OFDM symbols in the same manner. 2, the angle
  • V includes subcarriers.
  • the types of subcarriers may be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of reference signals, null subcarriers for guard bands, and DC components.
  • the null subcarriers for the DC component are subcarriers that are left unused and are used for OFDM signal generation and The black and white are mapped to the carrier frequency (carrier freqeuncy, fO) during the frequency upconversion process.
  • the carrier frequency is also called the center frequency.
  • One RB is defined as ⁇ (e.g., seven) consecutive OFDM symbols in the time domain, and is defined by two (e.g., twelve) consecutive subcarriers in the frequency domain. do.
  • a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB is It consists of three resource elements.
  • Each resource element in the resource grid may be uniquely defined by an index pair (k, 1) in one slot. k is from 0 in the frequency domain * V .c to -1. The index is given, and 1 is an index assigned from 0 to symb -1 in the time domain.
  • PRB physical resource block
  • Two RBs constituting a PRB pair have the same P B number (or also referred to as a PRB index).
  • VRB is a kind of logical resource allocation unit introduced for resource allocation.
  • VRB has the same size as PRB. According to the mapping method of the VRB to the PRB, the VRB is divided into a localized type VRB and a distributed type VRB. Localized type VRBs are mapped directly to PRBs so that the VRB number (also called VRB index) is directly mapped to the PRB number.
  • nPRB nVRB.
  • the distributed type VRB is mapped to the PRB through interleaving. Therefore, a distributed type VRB having the same VRB number may be mapped to PRBs having different numbers in the first slot and the second slot. Two PRBs, one in two slots of a subframe and having the same VRB number, are referred to as VRB pairs.
  • FIG. 3 illustrates a downlink (down 1 ink, DL) subframe structure used in a 3GPP LTE / LTE-A system.
  • a DL subframe is divided into a control region and a data region in the time domain.
  • up to three (or four) OFDM symbols located at the front of the first slot of a subframe are controlled in a control region to which a control channel is allocated.
  • a resource region available for PDCCH transmission in a DL subframe is called a PDCCH region.
  • the remaining OFDM symbols other than the OFDM symbol (s) used as the control region correspond to the data region to which the Physical Downl Ink Shared CHannel (PDSCH) is allocated.
  • PDSCH Physical Downl Ink Shared CHannel
  • a resource region available for PDSCH transmission in a DL subframe is called a PDSCH region.
  • Examples of DL control channels used in 3GPP LTE include PCFICH (Physical Control Format Indicator Channel), PDCCHCPhysical Downl Ink Control Channel (PHFICH), and PHHY (Physical Hybrid ARQ indicator Channel).
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information on the number of OFDM symbols used for transmission of a control channel within the subframe.
  • the PHICH carries a HARQ Hybrid Automatic Repeat Request (ACK) / ACK / NACK (acknowledgment / negat i-acknowledgment) signal in response to the UL transmission.
  • ACK Hybrid Automatic Repeat Request
  • DCI Downl ink control informat ion
  • DCI includes resource allocation information and other control information for the UE or UE group.
  • DCI may include a transmission format and resource allocation information of a downlink shared channel DL-SCH, a transmission format and resource allocation information of a UL ink shared channel (upl ink shared channel, UL-SCH), a paging channel ( Paging information on the paging channel (PCH), system information on the DL-SCH, resource allocation information of the upper layer control message such as random access response transmitted on the PDSCH, and transmission power control for individual UEs in the UE group.
  • DL-SCH downlink shared channel
  • DL-SCH downlink shared channel
  • the transmission format and resource allocation information of the UL-SCH are also called UL scheduling information or UL grant.
  • the DCI carried by one PDCCH has a different size and use depending on the DCI format, and its size may vary depending on a coding rate.
  • formats 0 and 4 for uplink formats 1, 1A, IB, 1C, 1D, 2, 2A, 2B, 2C, Various formats such as 3 and 3A are defined.
  • Hopping flag, RB allocation, mod ion coding scheme (MCS), redundancy version (NDK), NDKnew data indicator (RTK), transmit power control (TPC), and cyclic shift DMRSCcyclic shift demodulation Control information such as a reference signal, a UL index, a CQ I request, a DL assignment index, a HARQ process number, a transmitted precoding matrix indicator, and a PMKprecoding matrix indicator are selected.
  • the combination is transmitted to the UE as downlink control information.
  • the DCI format that can be transmitted to the UE varies according to a transmission mode (TM) configured in the UE.
  • TM transmission mode
  • DCI formats not all DCI formats can be used for a UE configured for a particular transmission mode, but only certain DCI format (s) can be used for the specific transmission mode.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
  • 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). For example, one CCE can be matched to nine REGs and one REG to four REs.
  • REGs resource element groups
  • a CCE set in which a PDCCH can be located is defined for each UE.
  • the set of CCEs through which the UE can discover its PDCCH is referred to as a PDCCH search space, simply a search space (SS).
  • SS search space
  • PDCCH candidate An individual resource to which a PDCCH can be transmitted in a search space is called a PDCCH candidate.
  • the collection of PDCCH candidates that the UE will monitor is defined as a search space.
  • a search space for each DCI format may have a different size, and a dedicated search space and a common search space are defined.
  • the dedicated search space is a UE-specific search space and is configured for each individual UE.
  • the common search space is configured for a plurality of UEs. The following illustrates aggregation levels that define search spaces.
  • One PDCCH candidate corresponds to 1, 2, 4 or 8 CCEs depending on the CCE aggregation level.
  • the eNB sends the actual PDCCH (DCI) on any PDCCH candidate in the search space, and the UE monitors the search space to find the PDCCH (DCI).
  • monitoring means attempting decoding of each PDCCH in the corresponding search space according to all monitored DCI formats.
  • the UE may detect its own PDCCH by monitoring the plurality of PDCCHs. Basically, since the UE does not know where its PDCCH is transmitted, every subframe attempts to decode the PDCCH until all PDCCHs of the corresponding DCI format have detected the PDCCH having their identifiers. bl ind detect ion) (blind decoding (BD)).
  • the eNB may transmit data for the UE or the UE group through the data region.
  • Data transmitted through the data area is also called user data.
  • PDSCHCPhysical Downl Ink Shared CHannel may be allocated to the data area.
  • PCHCPaging channel and DL-SCH (Downl ink-shared channel) are transmitted through PDSCH.
  • the UE may read data transmitted through the PDSCH by decoding control information transmitted through the PDCCH. That the data of the PDSCH, which are sent to the UE or UE group, and how the UE or UE group to which the information indicating the like that receives the PDSCH data to be decoded is transmitted is included in the PDCCH.
  • a specific PDCCH is masked with a cyclic redundancy check (CRC) with a Radio Network Temporary Identifier (RNTI) of "A", and a radio resource (eg, a frequency location) of "B" and a "".
  • CRC cyclic redundancy check
  • RNTI Radio Network Temporary Identifier
  • information on data transmitted using the transmission type information e.g., transport block size, modulation scheme, coding information, etc.
  • Monitoring the UE, and the UE having the RNTI "A" PDCCH is detected, and PDSCH indicated by "B” and "C” is received through the received PDCCH information.
  • a reference signal reference signal For demodulation of a signal received by the UE from the eNB, a reference signal reference signal (RS) to be compared with the data signal is required.
  • the reference signal refers to a signal of a predetermined special waveform known to the eNB and the UE, transmitted by the eNB to the UE or by the UE, also called a pilot (pi lot).
  • Reference signals are divided into a cell-specific (cel l-speci ic) RS shared by all UEs in a cell and a demodulat ion RS (DM RS) dedicated to a specific UE.
  • the DM RS that the eNB transmits for demodulation of downlink data for a specific UE may also be called UE-specific (UE-specific) RS.
  • the DM RS and the CRS may be transmitted together, but only one of the two may be transmitted.
  • the DM RS transmitted by applying the same precoder as the data can be used only for demodulation purposes, so that a channel measuring RS must be separately provided.
  • an additional measurement RS, CSI—RS is transmitted to the UE.
  • the CSI-RS is transmitted every predetermined transmission period consisting of a plurality of subframes, unlike the CRS transmitted every subframe based on the fact that the channel state does not change relatively over time.
  • uplink (upl ink, UL) subframe structure used in a 3GPP LTE / LTE-A system.
  • a UL subframe may be divided into a control region and a data region in the frequency domain.
  • One or several PUCCHs (physical upl ink control channel) may be allocated to the control region to carry uplink control information (UCI).
  • One or several PULSs may be allocated to the data region of the UL subframe to carry user data.
  • subcarriers having a long distance based on a direct current (DC) subcarrier are used as a control region.
  • subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of uplink control information.
  • the DC subcarrier is a component that is not used for signal transmission and is mapped to a carrier frequency f0 during frequency upconversion.
  • the PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency in one subframe, and the RBs belonging to the RB pair are assigned to two slots. Occupy different subcarriers.
  • the PUCCH allocated in this way is expressed as that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, if frequency hopping is not applied, RB pairs occupy the same subcarrier.
  • the PUCCH may be used to transmit the following control information.
  • [70]-SR Service Request: Information used to request an uplink UL-SCH resource. It is transmitted using 00K (0n-0ff Keying) method.
  • HARQ-ACK Answer to PDCCH and / or answer to downlink data packet (eg codeword) on PDSCH. Indicates whether the PDCCH or PDSCH has been successfully depthed.
  • HARQ-ACK 1 bit is transmitted in response to a single downlink codeword, and HARQ-ACK 2 bits are transmitted in response to two downlink codewords.
  • HARQ-ACK response includes a positive ACK (simply ACK), a negative ACK (hereinafter NACK), Discrete Inuous Transmission (DTX) or NACK / DTX.
  • NACK negative ACK
  • DTX Discrete Inuous Transmission
  • NACK Discrete Inuous Transmission
  • CSI Channel State Informat ion
  • MULTO Modul t iple Input Mul t iple Output
  • RI Rank Indicator
  • RI PMK Precoding Matrix Indicator
  • the amount of uplink control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for transmission of control information.
  • SC-FDMA available for UCI means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of a subframe in which a Sounding Reference Signal (SRS) is configured, The last SC-FDMA symbol is also excluded.
  • the reference signal is used for coherent detection of the PUCCH.
  • PUCCH supports various formats according to the transmitted information. Table 4 below shows a mapping relationship between PUCCH format and UCI in LTE / LTE-A system.
  • the PUCCH format 1 series is mainly used to transmit ACK / NACK information
  • the PUCCH format 2 series is mainly channel state information such as CQI / PMI / RI (channel state informat ion, CSI).
  • the PUCCH format 3 series is mainly used to transmit ACK / NACK information.
  • the present invention relates to a resource allocation scheme of a UE or a relay UE and relates to efficient resource management between a wireless access network (WAN) link and a device-to-device (D2D) link.
  • WAN wireless access network
  • D2D device-to-device
  • a relay UE refers to a UE operating as a relay to provide network access capability to a UE located outside the coverage of the serving eNB.
  • 5 illustrates connection of an eNB—rUE and a rUE-UE according to an embodiment of the present invention.
  • the UE may be a UE located outside the coverage of the eNB.
  • the rUE may transmit the information received from the eNB to the UE or the information received from the UE to the eNB while maintaining both the link with the eNB and the link with the UE.
  • some of the signals transmitted and received by the rUE via the link with the eNB may be information unrelated to the UE, and such information will not be relayed to the UE.
  • some of the signals rUE transmits and receives over the link with the UE may be information irrelevant to the eNB. This information will not be relayed to the eNB.
  • the link between the eNB-rUE is called a link
  • the link between the rUE and the UE is called a D2D link.
  • rUE is described as an example, the present invention can be equally applied to a hot link between eNB-UE and a D2D link between UE-UE.
  • the rUE operates in one of three types of transmission modes shown in FIG. 6 at one time point.
  • [80]-WAN UL Transmission of a control channel (feedback) and / or data from a rUE to an eNB, wherein the control channel is feedback to the N DL, and the control channel and data are feedback received from the UE through a D2D link. Or for conveying data.
  • [81]-D2D TX Transmission of control channel (feedback) and / or data from rUE to UE
  • [82]-D2D RX transmission of control channel (feedback) and / or data from UE to rUE, rUE receiving control channel (feedback) and / or data from UE
  • the eNB, rUE, and UE should have a common awareness of what transmission is made in which resource region.
  • the eNB may configure resources for D2D Tx / Rx to the rUE.
  • This method can again be a semi-static method and a dynamic one, where the semi-static method sets a specific SF and RB for D2D Tx / Rx for a defined period and repeats that setting for a fixed period. You can do that.
  • This may be possible by allocating a semi-persistent resource region through a WAN DL control channel such as an SPS or by notifying the resource region through a higher layer signal such as an RRC. In this case, if there is a predetermined Tx / Rx pattern, it may be possible to inform the index of the pattern.
  • the dynamic method is a method of dynamically allocating resource regions to be used for D2D Tx or Rx through the control channel of the WAN DL.
  • the main feature of the eNB resource allocation scheme is that the eNB separately configures resources for D2D Tx and resources for D2D Rx to rUE. rUE allows D2D signal transmission only in D2D Tx resources and D2D Tx is not allowed in D2D Rx resources.
  • a resource is designated as a D2D Rx resource to a rUE, it may be regarded as a D2D Tx dedicated resource of a UE outside coverage.
  • rUE There are two types of methods based on rUE. First, a method in which rUE arbitrarily allocates resources to be used for D2D Tx and resources to be used for D2D Rx within the D2D resource region set by the eNB. In this case, the D2D resource region may be semi-statically or dynamically as in the resource allocation scheme by the eNB. rUE allocates all or part of a given D2D resource region by dividing it into D2D Tx resources and D2D Rx resources.
  • FIG. 7 illustrates that rUE is configured such that a corresponding D2D resource is used for D2D Tx and D2D Rx when one SF is periodically allocated to the D2D link every four SFs.
  • the rUE may divide the entire available resource area (which can also be set by the eNB) according to each transmission mode, i.e. for WAN UL, for D2D Tx and for D2D Rx. .
  • the rUE it is illustrated that D2D SF and D2D Tx / Rx SF are set by rUE rather than eNB.
  • This scheme may be used as a feedback of rUE for the configuration when the eNB configures the D2D or D2D Tx / Rx resource region. That is, the rUE can obtain a traffic load, channel information, interference information, etc. between the rUE and the UE in a discovery procedure, etc., and based on such information, an optimized resource allocation in terms of the rUE can be obtained. After performing this, it may report to the eNB.
  • the resource allocation by the rUE may be divided into three modes, but may be divided into a WAN link and a D2D link.
  • the eNB may set the D2D or D2D Tx / Rx resource region closest thereto based on the reported information.
  • rUE selects the most appropriate one or more patterns from the viewpoint.
  • Report to the eNB and the eNB may refer to this to perform D2D resource allocation to the rUE.
  • the eNB may simply play a role of checking the resource region set by the rUE (conf i rm). In this case, it may be considered that resource allocation is entirely performed by the rUE. If the traffic load, channel information, and interference information change over time, the rUE chooses an optimal resource allocation from its perspective. Feedback or request reassignment of resources. It would also be possible for the e NB to request feedback periodically or aperiodically.
  • resource reallocation information may be transmitted through a black D2D control channel by piggybacking D2D data in the D2D Tx resource region.
  • eNB When resource classification allocation according to each transmission mode is performed by rUE, corresponding information should be reported to eNB as well as UE.
  • the signaling for the UE will be the same as when resource allocation by the eNB is taken.
  • Signaling for the eNB may include only information on the D2D, and may include information on the D2D Tx / Rx. This signaling may be possible through a higher tradeoff signal such as RRC, or may be delivered in a piggybacked form on a control channel such as PUCCH or PUSCH.
  • the eNB may distinguish SFs for the D2D link, and thus, may know which SFs block the existing WAN UL operation in accordance with a predetermined rule. ⁇ You can analyze the operation in SF where UL operation is prohibited. For example, if SF # n is set to D2D Tx SF, rUE is scheduled to that SF.
  • the eNB receives resource classification allocation information from the rUE, it knows that SF #n is set to D2D Tx SF and does not attempt to receive ACK / NACK and performs ACK / NACK of the form coupled to the next valid WAN UL SF. It expects to receive and decodes accordingly.
  • the D2D Tx / Rx discrimination information may be usefully used for the eNB.
  • D2D Tx SF it is connected to eNB, so the distance to eNB is relatively close Since strong interference occurs due to the D2DTx of the rUE, it is difficult to utilize the resource for NUL purposes, while in the D2DRx SF, the D2D Rx of the rUE is caused by a relatively far-away UE outside the coverage of the eNB. It is relatively insignificant so that a WAN UL of another r UE or another UE can be scheduled in a corresponding resource region. 9 shows that the D2DRx resource region can be reused for WANUL transmission of rUE2 or UE2. For this reason, as described above, it is advantageous to separate the D2D Tx resource and the D2D Rx resource in terms of rUE.
  • Multi-cluster transmission means that up to two non-adjacent RB clusters are transmitted for one CC. Therefore, for the multi-cluster-scheduled SF, one of the multi-clusters can be used for WAN UL transmission, or one cluster can be used for WAN UL and the other cluster can be used for D2D Tx.
  • resource classification allocation information that the rUE signals to the eNB and the UE may vary depending on whether the rUE performs NUL or WANUL and both D2DTx in a multi-cluster-scheduled SF. If the rUE performs both N UL and D2D Tx, the SF may be classified as WANUL in resource allocation information delivered to the eNB, but may be classified as D2DTx in resource allocation information delivered to the UE. That is, the SF is known as an SF whose WANUL is not prohibited by the eNB and an SF which is not prohibited by the D2D UL. On the other hand, if the rUE uses the SF only for the WAN UL, the SF will be divided into the WAN UL in the resource classification allocation information transmitted to the UE.
  • FIG. 10 illustrates signaling of rUE in multi-cluster-configured SFs in accordance with an embodiment of the present invention.
  • FIG. 10 when two clusters (clusters 1 and 2) 7 are scheduled, it is assumed that one of the clusters (clusters 2) is available for D2D Tx.
  • the rUE since only cluster 1 is used in SF #n corresponding to (a) of FIG. 10, the rUE may signal the SF #n to the eNB and the UE by dividing the SF #n into N UL.
  • FIG. 10B since clusters 1 and 2 are used in SF #m, rUE should signal SF #m so as to be classified as WAN UL to eNB and D2D TX to UE.
  • WAN-D2D Tx a separate transmission mode for multi-cluster transmission may be newly defined, thus, WAN UL or D2D Tx / Rx.
  • Multi-cluster transmission is not configured in SF divided by, and in SF divided by WAN-D2D Tx, both cluster 1 and cluster 2 can be used to transmit rUE.
  • the signaling may simply be in the form of a bitmap.
  • a bitmap having a value of 1 for SF that is, D2D Tx / Rx SF
  • 0 for other SF may be transmitted.
  • a bitmap having a value of 1 or 0 may be transmitted for SFs (that is, WAN UL SFs) for which D2D Tx / Rx is prohibited.
  • D2D Tx / Rx since a configuration for D2D Tx / Rx must be transmitted, a bitmap having a value of 0 for 1 D2D Rx may be additionally transmitted for D2D Tx. Meanwhile, D2D Tx / Rx information may be additionally transmitted to the eNB.
  • the bitmap may enable the eNB and the rUE / UE to know the application time in common by promising the position where the first bit is transmitted as the first SF of the radio frame, and receiving the bitmap.
  • An rUE / UE can be interpreted as a pattern that is repeated continuously for a predetermined time period or until a reset occurs.
  • the rUE may report assistance information for the following D2D resource classification allocation to the eNB for efficient resource allocation allocation of the eNB.
  • the report may be made without or without the request of the eNB.
  • the utilization ratio may be defined as [the amount of resources used for the actual D2D Tx / Rx] / [the total amount of resources for the D2D allocated from the eNB].
  • the utilization ratio is [the number of SFs used for the actual D2D Tx / Rx] / [the total number of D2D SFs allocated from the eNB]. It may be defined as.
  • Location of avoided (or preferred) resource Refers to the location information of SF, which is difficult to communicate with D2D due to interference from neighbor cell among resource regions allocated by eNB. Opposite If there is a SF having a relatively good null state, the location information of the SF may be reported as preferred resource information.
  • the information on the location of the avoided resource may have a subset form of a bitmap indicating resource allocation allocation received from the eNB.
  • the position corresponding to 1 of the bitmap for information on the location of the avoided resource corresponds to 1 of the bitmap indicating resource classification allocation received from the eNB (ie, D2D SF) and at the same time rUE SF may be used for communication with the UE, and a position corresponding to 0 may indicate other SF.
  • the utilization ratio may be defined as follows.
  • ⁇ D2D channel information and interference measurement information may also be reported directly to the eNB.
  • This can have the same format as conventional received signal strength indicator (RSSI), reference signal received power (RSRP), and channel state informat ion (CSI) feedback, which can be distinguished from those of the WAN link or Feedback mode will be required.
  • RSSI received signal strength indicator
  • RSRP reference signal received power
  • CSI channel state informat ion
  • the information may be transmitted through an upper layer signal, a control channel such as PUCCH, or a eNB piggybacked to a PUSCH, and may be periodically transmitted at a request of a black eNB.
  • the information may be reported in unsol icited form when the resource utilization for D2D is changed to a certain level and / or the location of the avoided resource is changed (unsol icitedly). It may be instructed to report only information selectively.
  • the eNB Upon receiving the information from the rUE, the eNB will newly perform resource division allocation.
  • resource division allocation, information transmission (reception), and resource division reallocation described above are as follows.
  • a resource classification allocation for example, configuration 1
  • the rUE transmits D2D Tx / Rx or WAN UL according to configuration 1 above.
  • the above-described resource configuration method of rUE is used, it is as follows. In this case, no explicit or direct resource utilization information is reported from the rUE to the eNB, but in a similar situation, the rUE performs resource classification allocation suitable for its load and delivers it to the eNB, or if there is a predetermined pattern, reports the index of the appropriate pattern Resource reallocation.
  • FIG. 12 illustrates a signaling procedure when a rUE requests to reduce and use a resource amount set to D2D SF by a eNB at half level.
  • the rUE may signal a direct preference setting (eg, configuration 2) to the eNB.
  • a predetermined setting index eg, setting index 2 that is close to the preferred setting (eg, setting 2) may be reported.
  • each configuration index indicates not only SF configuration but also bandwidth (RB).
  • RB bandwidth
  • configuration indexes 1 and 2 are both related to 2RB, but configuration index 3 is related to 1RB, and if eNB attempts to reduce the amount of resources for D2D by half, the configuration index 1 to configuration index 2 or configuration index 3 It is possible to reset.
  • the rUE feeds back resource classification allocation information in the form of a bitmap may be used as a method for reporting an avoided resource or reporting an available resource.
  • the utilization information may be reported together, and the eNB may reassign all or part of the available resources to the rUE in consideration of the D2D resource utilization.
  • the resource allocation amount and location of the UE and rUE can be adjusted.
  • FIG. 13 illustrates the operation according to one embodiment of the present invention.
  • UE 1 is a terminal configured to perform D2D communication.
  • the UE 1 may receive information on the entire available resource area of the D2D communication from the eNB 2 (S1310).
  • the total available resource area of the D2D communication means an area for D2D communication among all resource areas that can be scheduled by the eNB 2.
  • a corresponding resource region may be identified in subframe units in a 3GPP LTE (-A) system.
  • the UE 1 sends a request for resource allocation to be used for the D2D communication based on the information on the entire available resource area and the channel information of the D2D communication.
  • the eNB 2 may transmit the information to the eNB 2.
  • the request for resource allocation is a request for a resource region that the UE 1 desires for the D2D communication, and the eNB 2 must allocate a resource region indicated by the request for the D2D communication. no.
  • the UE 1 may receive resource allocation information for the D2D communication determined based on the request for resource allocation from the eNB 2 (S1330).
  • At least one of the information on the entire available resource area of the D2D communication, the request for resource allocation, or the resource allocation information may be in a bitmap format.
  • each bit value is a subframe. It can be set to indicate.
  • the channel information of the D2D communication may include at least one of a traffic load, a channel state, or an interference amount of a D2D communication channel between the UE 1 and a peer UE (not shown).
  • the request for resource allocation may include a procedure for a D2D operation mode divided into D2D transmission or D2D reception.
  • the eNB 2 may determine a resource region capable of scheduling other UEs other than the peer UE of the UE 1 and the UE 1 by using the information on the D2D operation mode, and in the corresponding resource region Other UEs may be scheduled.
  • the UE 1 may transmit assistance information for resource allocation of the D2D communication to the serving base station.
  • the auxiliary information may include at least one of resource utilization ratio for the D2D communication, avoided or preferred resource for the D2D communication, or channel state and interference of the D2D communication.
  • the eNB 2 receiving the assistance information may determine updated resource allocation information of the D2D communication based on the assistance information, and transmit the updated resource allocation information to the UE 1. have.
  • the UE 1 may transmit a resource allocation re-request to the serving base station when the channel information of the D2D communication is changed beyond a predetermined range.
  • the embodiment related to FIG. 13 may alternatively or additionally include at least some of the above-described embodiment (s). .
  • the 14 is a block diagram illustrating components of a transmitter 10 and a receiver 20 for performing the embodiment (s) of the present invention.
  • the transmitter 10 and the receiver 20 may transmit or receive wired and / or wireless signals carrying information and / or data signals, messages, and the like.
  • the transmission and reception units 13 and 23 and various types of information related to communication in the wireless communication system .
  • the above-described embodiment of the present invention is operatively connected to components such as a memory 12, 22, the transmission / reception unit 13, 23, and the memory 12, 22, and controls the components.
  • a processor 11, 21 configured to control the doktor memory 12 ⁇ 22 and / or the transmit / receive units 13, 23, respectively, to perform at least one of the examples.
  • the memory 12, 22 may store a program for processing and controlling the processor 11, 21, and may temporarily store input / output information. Memory 12, 22 may be utilized as a buffer.
  • the processor 11 ⁇ 21 typically controls the overall operation of the various models in the transmitter or receiver. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention.
  • the processors 11 and 21 may also be called controllers, micro crocontrollers, microprocessors, microcomputers, or the like.
  • the processors 11 and 21 can be implemented by hardware or firmware, software, or a combination thereof.
  • ASICs application icat ion speci fic integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable. logic deviation ces
  • FPGAs f ieId progra ⁇ able gate arrays
  • pipware or software may be configured to include modules, procedures, or functions that perform the functions or operations of the present invention, and may perform the present invention.
  • the configured firmware or software may be provided in the processor 11, 21 or stored in the memory 12, 22 to be driven by the processor 11, 21.
  • the processor 11 of the transmission apparatus 10 may be configured to perform a predetermined encoding and / or reception on a signal and / or data which is scheduled from the processor 11 or a scheduler connected to the processor 11 and transmitted to the outside. After modulating (modulat ion) is transmitted to the transmission and reception unit (13). For example, the processor 11 converts the data sequence to be transmitted into K layers through demultiplexing, channel encoding, scrambling, and modulation.
  • the coded data string is also called a codeword and is equivalent to a transport block, which is a data block provided by the MAC layer.
  • One transport block (TB) is encoded by one codeword, and each codeword is transmitted to a receiving device in the form of one or more layers.
  • the transceiver unit 13 may include an oscillator.
  • the transmit / receive unit 13 may include Nt transmit antennas, where Nt is a positive integer greater than or equal to one.
  • the signal processing process of the receiving device 20 consists of the inverse of the signal processing process of the transmitting device 10.
  • the transmission / reception unit 23 of the reception device 20 receives a radio signal transmitted by the transmission device 10.
  • the transmit / receive unit 23 may include Nr receive antennas, and the transmit / receive unit 23 reconverts each of the signals received through the receive antenna into a frequency down-convert baseband signal. .
  • the transmit / receive unit 23 may include an oscillator for frequency downconversion.
  • the processor 21 may decode and demodulate a radio signal received through a receiving antenna to restore data originally intended to be transmitted by the transmitter 10.
  • the transmission and reception units 13 and 23 are provided with one or more antennas.
  • the antenna transmits a signal processed by the transmission / reception units 13 and 23 to the outside under the control of the processors 11 and 21, or receives a radio signal from the outside to receive the transmission / reception unit 13 , 23).
  • the antenna is also called the antenna port.
  • Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna elements.
  • the signal transmitted from each antenna can no longer be decomposed by the receiver 20.
  • the reference signal (RS) transmitted for the corresponding antenna defines the antenna as viewed from the perspective of the receiving device 20, and whether the channel is a single radio channel from one physical antenna or includes the antenna.
  • the antenna is defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is carried.
  • MIM0 multiple input / output
  • the UE operates as the transmitter 10 in the uplink and operates as the receiver 20 in the downlink.
  • the eNB operates as the receiver 20 in the uplink, and operates as the transmitter 10 in the downlink.
  • the transmitter 10 or the receiver 20 may perform a combination of at least one or two or more of the above-described embodiments of the present invention.
  • the present invention can be used in a communication device such as a terminal relay, a base station, or the like.

Abstract

La présente invention concerne, dans un de ses modes de réalisation, un procédé d'attribution de ressources d'un terminal configuré pour réaliser une communication de dispositif à dispositif (D2D) dans un système de communications sans fil, le procédé pouvant comporter les étapes consistant à: recevoir, en provenance d'une station de base de desserte, des informations sur la totalité de la région de ressources disponibles de la communication D2D; envoyer à la station de base une demande d'attribution de ressources nécessaires pour la communication D2D d'après les informations sur la totalité de la région de ressources disponibles et des informations de canal de la communication D2D; et recevoir en provenance de la station de base des informations d'attribution de ressources pour la communication D2D, déterminées d'après la demande d'attribution de ressources.
PCT/KR2014/007634 2013-08-16 2014-08-18 Procédé d'émission de signaux dans une communication de dispositif à dispositif et appareil associé WO2015023163A1 (fr)

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CN201480045513.2A CN105453679B (zh) 2013-08-16 2014-08-18 设备到设备通信中的信号传输方法及其装置
US14/912,395 US10314092B2 (en) 2013-08-16 2014-08-18 Signal transmission method in device-to-device communication and apparatus therefor
KR1020167003228A KR102221297B1 (ko) 2013-08-16 2014-08-18 장치 대 장치 통신에서 신호 전송 방법 및 이를 위한 장치
US16/364,858 US10575354B2 (en) 2013-08-16 2019-03-26 Signal transmission method in device-to-device communication and apparatus therefor
US16/743,860 US10973064B2 (en) 2013-08-16 2020-01-15 Signal transmission method in device-to-device communication and apparatus therefor

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WO2013062310A1 (fr) * 2011-10-24 2013-05-02 엘지전자 주식회사 Procédé pour permettre à une station de base de prendre en charge une communication de dispositif à dispositif (d2d) dans un système de communication sans fil, et procédé pour permettre à un dispositif d2d d'émettre efficacement un signal de requête de communication d2d
WO2013066126A1 (fr) * 2011-11-03 2013-05-10 엘지전자 주식회사 Procédé pour transmettre et recevoir un signal de référence dans un système d'accès sans fil, et appareil pour la mise en œuvre de ce procédé
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WO2013109100A1 (fr) * 2012-01-18 2013-07-25 엘지전자 주식회사 Procédé de communication entre dispositifs et dispositif associé

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WO2017028154A1 (fr) * 2015-08-17 2017-02-23 华为技术有限公司 Procédé et dispositif d'indication d'attribution de ressource, point d'accès, et équipement d'utilisateur
WO2019033424A1 (fr) * 2017-08-18 2019-02-21 Oppo广东移动通信有限公司 Procédé, dispositif terminal et dispositif réseau pour planifier des ressources
US11147077B2 (en) 2017-08-18 2021-10-12 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method, terminal device and network device for scheduling resources

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