WO2015046773A1 - 하향링크 제어 정보 송수신 방법 및 그 장치 - Google Patents
하향링크 제어 정보 송수신 방법 및 그 장치 Download PDFInfo
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- WO2015046773A1 WO2015046773A1 PCT/KR2014/008216 KR2014008216W WO2015046773A1 WO 2015046773 A1 WO2015046773 A1 WO 2015046773A1 KR 2014008216 W KR2014008216 W KR 2014008216W WO 2015046773 A1 WO2015046773 A1 WO 2015046773A1
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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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- the present invention relates to a method and apparatus for transmitting and receiving downlink control information in a wireless communication system, and more particularly, a method for repeatedly transmitting and receiving downlink control information for a terminal located in enhanced coverage compared to a coverage for a general terminal. And to an apparatus.
- Machine Type Communication or Machine to Machine (M2M) is communication between devices and things with no or minimal human intervention.
- Machine may mean an entity that does not require direct human intervention or intervention, and "MTC” may mean a form of data communication that includes one or more such machines.
- An example of a “machine” may be a smart meter or vending machine equipped with a mobile communication module, and recently, a smartphone that automatically connects to a network and performs communication without user intervention or intervention depending on the location or situation of the user. With the advent of the portable terminal with the MTC function is also considered as a form of machine.
- the MTC terminal may be installed in a place where the radio environment is worse than that of the general terminal. Therefore, the coverage of the MTC terminal should be improved to 20dB or more compared to the coverage of the general terminal.
- an MTC terminal In order for an MTC terminal to operate in coverage improved by 20 dB or more compared to a general terminal, it may be necessary to repeatedly transmit control information and / or data of each physical channel transmitted only in one subframe unit in a plurality of subframes.
- the present invention is a base station to the terminal so that the extended terminal can receive the downlink control channel through a plurality of subframes, and also obtain scheduling information of the downlink data channel and / or uplink data channel transmission resources. It is an object of the present invention to provide a method and apparatus for informing configuration information.
- a method for receiving downlink control information (DCI) through a downlink control channel (PDCCH or EPDCCH) repeatedly allocated in a plurality of subframes is provided.
- DCI downlink control information
- PDCCH downlink control channel
- a method for receiving downlink control information comprising extracting downlink control information from a control channel.
- a base station transmits downlink control information through a downlink control channel repeatedly allocated in a plurality of subframes, and the configuration information for the plurality of subframes is transmitted through higher layer signaling. Transmitting; And providing downlink control information through the downlink control channel allocated repeatedly in the plurality of subframes.
- Another embodiment of the present invention is a terminal for receiving downlink control information through a repeatedly allocated downlink control channel in a plurality of subframes, and receives configuration information for the plurality of subframes through higher layer signaling.
- Another embodiment of the present invention is a base station for transmitting downlink control information through a repeatedly allocated downlink control channel in a plurality of subframes, the information on the starting subframe of the plurality of subframes, the plurality of subframes
- the configuration information including at least one of information on the number of frames and information on the maximum number of the plurality of subframes is transmitted to the terminal through higher layer signaling, and is repeatedly allocated in the plurality of subframes.
- a base station including a transmitter for transmitting downlink control information through a link control channel.
- the terminal having extended coverage can receive the downlink control channel through a plurality of subframes and can also acquire scheduling information of the downlink data channel and / or uplink data channel transmission resource.
- the base station may inform the terminal of the configuration information.
- FIG. 1 shows an example of a wireless communication system to which an embodiment of the present invention is applied.
- FIG. 2 illustrates an example of a method for a general terminal to blind decode a PDCCH / EPDCCH and receive a PDSCH.
- FIG. 3 illustrates an example of a method in which a UE having extended coverage blindly decodes PDCCH / EPDCCH and receives a PDSCH.
- FIG. 4 illustrates an example in which the UE does not know the number of subframes in which the PDCCH is repeated in the example of FIG. 3.
- FIG. 5 illustrates a DCI transmission / reception method according to the first embodiment.
- FIG. 6 shows an example of PDCCH and PDSCH reception according to FIG. 5.
- FIG. 7 shows another example of PDCCH and PDSCH reception according to FIG. 5.
- FIG. 9 illustrates an example of PDCCH and PDSCH reception according to FIG. 8.
- FIG. 10 illustrates an example of a method in which a coverage extended terminal blind decodes a PDCCH and receives a PDSCH when the PDCCH / EPDCCH and the PDSCH are repeated in the same subframes.
- FIG. 11 illustrates a DCI transmission / reception method according to the third embodiment.
- FIG. 12 illustrates an example of PDCCH and PDSCH reception according to the example of FIG. 11.
- FIG. 13 shows a DCI transmission / reception method according to the fourth embodiment.
- FIG. 14 shows an example of PDCCH and PDSCH reception according to the example of FIG. 13.
- FIG. 15 illustrates a configuration of a terminal according to an embodiment of the present invention.
- FIG. 16 shows a configuration of a base station according to an embodiment of the present invention.
- FIG. 1 shows an example of a wireless communication system to which an embodiment of the present invention is applied.
- the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
- the wireless communication system includes a user equipment (UE) 10 and a base station (Base Station, BS, or eNB) 20.
- a user terminal is a generic concept meaning a terminal in wireless communication.
- user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
- a base station 20 or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, and a Site. It may be called by other terms such as a base transceiver system (BTS), an access point, an access node, a relay node, a remote radio head (RRH), and a radio unit (RU).
- BTS base transceiver system
- RRH remote radio head
- RU radio unit
- the base station 20 or a cell indicates some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted in a comprehensive sense and encompasses various coverage areas such as megacells, macrocells, microcells, picocells, femtocells and relay nodes, RRHs, and RU communication ranges.
- BSC base station controller
- the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
- the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
- the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
- the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- OFDM-FDMA OFDM-TDMA
- OFDM-CDMA OFDM-CDMA
- One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
- the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
- the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
- TDD time division duplex
- FDD frequency division duplex
- Uplink and downlink are control channels such as Physical Downlink Control CHannel (PDCCH), Enhanced PDCCH (EPDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH).
- the control information is transmitted through a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
- a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
- a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
- antenna transmission system a cooperative multi-cell communication system.
- the CoMP system may include at least two multiple transmission / reception points and terminals.
- the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- an eNB a base station or a macro cell
- a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
- uplink means a communication or communication path from a terminal to multiple transmission / reception points.
- a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
- a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
- a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.
- the base station 20 performs downlink transmission to the terminals 10.
- the base station 20 is a downlink control information and uplink data channel such as a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and scheduling required for reception of the PDSCH.
- PDSCH physical downlink shared channel
- a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in eg, a physical uplink shared channel (PUSCH)
- PUSCH physical uplink shared channel
- the base station 20 transmits downlink control information (DCI) to the terminal 10 through a PDCCH / EPDCCH.
- the DCI may include a downlink scheduling assignment including PDSCH resource information or an uplink scheduling grant including PUSCH resource information.
- the base station 20 uses DCI to allocate uplink / downlink data transmission resources to the terminal 10 and transmits the same to the terminal 10 using a downlink control channel.
- the downlink control channel may be classified into a PDCCH and an EPDCCH according to a location of a transmission resource used for transmitting a DCI.
- the PDCCH is transmitted in a control region established through a control format indicator (CFI).
- CFI control format indicator
- the control region is formed over the entire downlink bandwidth and consists of 1 to 4 OFDM symbols for each subframe according to the CFI setting value.
- the EPDCCH is transmitted using the remaining transmission resources except for the control region in each subframe.
- a transmission resource used for EPDCCH transmission may be used only for a subframe predefined with higher layer signaling (for example, RRC (Radio Resource Control)) and a plurality of predefined PRB (Physical Resource Block) pairs for each UE. have.
- RRC Radio Resource Control
- PRB Physical Resource Block
- a basic transmission resource unit may be referred to as a control channel element (CCE).
- CCE control channel element
- One CCE may consist of nine Resource Element Groups (REGs), and one REG may consist of four Resource Elements (REs).
- the basic transmission resource unit may be referred to as ECCE (Enhanced CCE).
- ECCE Enhanced CCE
- One ECCE is composed of 4 or 8 EREGs (Enhanced REGs) according to cyclic prefix length and / or TDD configuration, and one EREG is a plurality of REs that are variable according to REs used for RS (Reference Signal) transmission. Can be configured.
- the base station 20 may set the number of CCEs used to transmit one DCI through the PDCCH according to the channel condition of the terminal. This is called an aggregation level, and 1, 2, 4, or 8 CCEs may be used according to the channel condition of the UE.
- the base station 20 may set the number of ECCEs used when transmitting one DCI through the EPDCCH according to the channel condition of the terminal. This is called an aggregation level, and 1, 2, 4, 8, 16, or 32 ECCEs may be used according to the channel condition of the UE.
- the PDCCH / EPDCCH is composed of a plurality of CCE / ECCE
- the base station can transmit a plurality of DCI to a plurality of terminals in every subframe.
- the UE does not separately provide CCE / ECCE allocation information (that is, CCE aggregation level information and CCE transmission resource location information used for one DCI transmission) necessary for the UE to receive DCI through PDCCH / EPDCCH. Therefore, the terminal performs blind decoding on the aggregation level and the CCE transmission resource that are possible to confirm the DCI transmitted to the terminal.
- the PDCCH configured with CCE / ECCE indexes defined for each UE is practically impossible.
- Blind decoding is performed only on candidate / EPDCCH candidate.
- the CCE index / ECCE index constituting the PDCCH candidate / EPDCCH candidate for each aggregation level may be defined as a function of an aggregation level, a value of a Radio Network Temporary Identifier (RNTI), and a slot number (or subframe number).
- the UE may perform blind decoding only on a limited number of PDCCH candidates / EPDCCH candidates per aggregation level in every subframe.
- FIG. 2 illustrates a method of blind decoding a PDCCH / EPDCCH by a general terminal and receiving a PDSCH.
- the UE attempts blind decoding of the PDCCH / EPDCCH for the PDCCH candidate / EPDCCH candidate.
- a cyclic redundancy check (CRC) is added to the DCI, and the UE checks the CRC to confirm the DCI transmitted to the DCI.
- CRC cyclic redundancy check
- the UE acquires downlink scheduling information included in the DCI and decodes the PDSCH using downlink data transmission resources in the same subframe as the subframe in which the DCI is transmitted. do.
- PUSCH scheduling information may also be obtained by blind decoding PDCCH / EPDCCH.
- Machine Type Communication is defined as communication between devices and things without human intervention.
- machine means an entity that does not require direct human intervention or intervention.
- MTC is defined as a form of data communication in which one or more such machines are included.
- a machine a form of a smart meter or vending machine equipped with a mobile communication module has been mentioned, but recently, a smartphone that automatically connects to a network and performs communication without user intervention or intervention according to a user's location or situation. With the advent of the portable terminal with the MTC function is also considered as a form of machine.
- the main standard item related to physical layer specification change which is currently being discussed in 3GPP, may include technologies such as narrowband support, single RF chain, half duplex FDD, and long DRX (Discontinued Reception).
- technologies such as narrowband support, single RF chain, half duplex FDD, and long DRX (Discontinued Reception).
- the above methods which are considered to lower the price, may reduce the performance of the MTC terminal compared to the conventional LTE terminal.
- the coverage of LTE MTC terminals is the same as that of conventional LTE terminals. Compared by 20dB. In addition, if the performance reduction due to the specification change is further considered, the coverage of the LTE MTC terminal should be improved by 20 dB or more.
- the requirements of the LTE-based low-cost MTC terminal is as follows.
- the data rate should satisfy the data rate provided by the minimum EGPRS-based MTC terminal, that is, downlink 118.4kbps, uplink 59.2kbps.
- the service area provided shall not be smaller than that provided by the GSM / EGPRS MTC terminal.
- ⁇ Power consumption should not be greater than GSM / EGPRS MTC terminal.
- Legacy LTE terminal and LTE MTC terminal must be available in the same frequency.
- ⁇ Optimization is performed not only in the FDD mode but also in the TDD mode.
- Low-cost LTE MTC terminals must support limited mobility and low power consumption modules.
- the data of each physical channel which is conventionally transmitted only in one subframe unit, is repeatedly transmitted to a plurality of subframes. May be considered.
- the terminal receiving this may decode the number of data transmitted by performing soft combining on the same transmission data in consideration of the number of repeated subframes.
- a terminal having 20 dB coverage extended may not succeed in blind decoding. Therefore, it may be considered to repeatedly transmit a DCI transmitted only in one subframe unit to a plurality of subframes.
- the UE receiving this may decode the number of DCIs transmitted by performing soft combining on the same DCI in consideration of the number of repeated subframes.
- FIG. 3 illustrates an example of a method in which a UE having extended coverage blindly decodes a PDCCH and receives a PDSCH.
- the base station repeatedly transmits one DCI through four subframes of SF # 0 (Subframe Number # 0) to SF # 3 in consideration of a channel condition of the UE.
- the base station repeatedly transmits the same data through four subframes of SF # 3 to SF # 6 in consideration of the channel condition of the terminal.
- the terminal blindly decodes all the received values of the DCI transmitted from SF # 0 to SF # 3 by blind decoding
- the terminal checks the scheduling information of the PDSCH included in the DCI.
- the terminal softly combines all the received values of the data transmitted in SF # 3 to SF # 6 to perform decoding.
- a transmission resource of a PDSCH through which data is transmitted is allocated from the last subframe among a plurality of subframes to which a PDCCH to which DCI is transmitted is allocated.
- the present invention is not limited thereto, and a relationship between a plurality of subframes in which DCI is repeatedly transmitted and a plurality of subframes in which data is repeatedly transmitted may be different.
- the transmission resource of the PDSCH through which data is transmitted may be allocated from the next subframe of the last subframe among the plurality of subframes to which the PDCCH to which the DCI is transmitted is allocated.
- the plurality of subframes in which DCI is repeatedly transmitted and the plurality of subframes in which data is repeatedly transmitted may be the same.
- PUSCH scheduling information may also be obtained by blind decoding PDCCH / EPDCCH.
- the UE may not know the number of subframes and / or information about the first subframe in which the PDCCH is repeated to transmit one DCI.
- the UE may attempt soft combining for the number of subframes and / or the first subframe in which the PDCCH is repeated. In this case, the following problems may occur.
- the UE may know the start subframe of the plurality of subframes in which the PDCCH is repeatedly transmitted but may not know the number of the plurality of subframes in which the PDCCH is repeatedly transmitted.
- FIG. 4 illustrates an example in which the UE does not know the number of a plurality of subframes in which the PDCCH is repeated in the example of FIG. 3.
- the UE knows that the PDCCH is transmitted from SF # 0. However, since the UE does not know how many subframes the same DCI is repeatedly transmitted, the UEI soft-combines the DCI received value with the previous DCI received value in every subframe from SF # 0 until the blind decoding succeeds. And blind decoding.
- the base station repeatedly transmits the PDCCH for four subframes of SF # 0 to SF # 3, and repeatedly transmits the PDSCH for four subframes of SF # 3 to SF # 6.
- the UE decodes the PDCCH from SF # 0 to It may be determined that three subframes of SF # 2 have been repeatedly transmitted, and it may be assumed that PDSCH transmission resources have been allocated from SF # 2. In this case, the actual PDSCH transmission resources are allocated from SF # 3, but the UE will attempt to soft combine and decode the data from SF # 2.
- the UE may know the number of subframes in which PDCCH is repeatedly transmitted but may not know the start subframe of the plurality of subframes in which PDCCH is repeatedly transmitted. In this case, the UE should store the DCI reception values transmitted in the previous three subframes in each buffer in each subframe.
- the UE may arbitrarily set the size of the buffer to store the DCI reception value transmitted in N subframes.
- the UE sequentially performs blind decoding by soft combining the DCI received values transmitted in 1 to N-1 subframes from the DCI received values transmitted in the current subframe every subframe.
- the number of blind decoding can be increased up to N times compared with the prior art. If the value of N is set to be small, blind decoding may fail. If the value of N is set to be large, processing time of the terminal is increased.
- the base station needs to transmit information about the start subframe and / or the number of the plurality of subframes to the terminal.
- a base station delivers information on a start subframe of a plurality of subframes and / or information on the number of a plurality of subframes to a terminal.
- FIG. 5 illustrates a DCI transmission / reception method according to the first embodiment.
- the base station transmits information on the start subframe and the number of the plurality of subframes of the plurality of subframes in which DCI is repeatedly transmitted through higher layer signaling to the terminal (S510).
- the information on the starting subframe may include a value of a specific subframe index (or subframe number) indicating a starting point and a value of a period for the starting subframe to be periodically repeated.
- the information about the starting subframe includes one or more of an N value representing a frame period and 10 * N subframe indexes. It may be information indicating a subframe index.
- the information indicating the subframe index may be a bitmap consisting of 10 * N bits.
- the base station transmits bit indexes 1 and 13 to '1' in the bitmap and the remaining bit indexes to '0'
- the UE transmits SF # 1 of the first frame and SF # 3 of the second frame in two frame periods. May be considered as a starting subframe in which DCI is transmitted. If the transmission period of the start subframe is a preset value (for example, 1 frame), the period value may be omitted.
- subframe configuration information of 'EPDCCH-Config information element' transmitted through higher layer signaling for EPDCCH transmission may be considered as starting subframe information of EPDCCH.
- the terminal performs blind decoding after soft combining the DCI received values in the subframe determined based on the information on the start subframe of the plurality of subframes and the information on the number of the plurality of subframes (S520).
- the number of times of blind decoding of the terminal may be the same as before.
- the UE acquires scheduling information of the PDSCH transmission resource or the PUSCH transmission resource included in the DCI (S530), and receives the PDSCH or transmits the PUSCH based on the obtained scheduling information (S540).
- FIG. 6 shows an example of PDCCH and PDSCH reception according to the present embodiment.
- the UE when the UE receives configuration information in which SF # 1 is set as a starting subframe and the number N of subframes is 4, the UE softens the DCI received values in SF # 1 to SF # 4. After combining, blind decoding is performed. If the blind decoding is successful, the UE acquires downlink scheduling information from the DCI, performs soft decoding on data in one or more subframes from SF # 4, and then performs decoding. When the UE transmits the PUSCH based on the uplink scheduling information, the UE may also be performed in a manner similar to that of FIG. 6.
- the UE even when the UE soft-combines the DCI transmitted through the PDCCH in three subframes of SF # 1 through SF # 3, and successfully decodes the blind, the UE information on the number of subframes in which the DCI is repeatedly transmitted. Since the DCI is known to be transmitted up to SF # 4 based on the UE, the UE will not attempt to soft combine data before the DCI repetitive transmission is completed.
- the transmission resource (subframe) of the PDSCH / PUSCH is determined by the subframe in which the PDCCH is transmitted and the transmission frame of the PDSCH / PUSCH is fixed because the subframe in which the PDCCH is transmitted is fixed by higher layer signaling.
- a problem may occur that is scheduled only to subframes that have been allocated. This can hinder the efficient use of resources. For example, in the case of FIG. 6, PDSCH reception is scheduled only through subframes consecutive from SF # 4.
- the scheduling information obtained in step S530 may include information about the start subframe to which the PDSCH / PUSCH is allocated and / or information about the number of subframes to which the PDSCH / PUSCH is repeatedly transmitted.
- the transmission resource (subframe) of the PDSCH / PUSCH can be set dynamically.
- the information on the starting subframe includes information on the index of the starting subframe in which the PDSCH / PUSCH is transmitted, the index of the subframe in which the PDCCH is transmitted (for example, the last subframe among the plurality of subframes in which the PDCCH is transmitted) and the PDSCH. It may include information about the difference in the index of the start subframe in which / PUSCH is transmitted.
- FIG. 7 shows another example of PDCCH and PDSCH reception according to the present embodiment.
- the UE when SF # 1 is set as a starting subframe and the number of subframes is 4, the UE performs blind decoding after soft combining the DCI received values in SF # 1 to SF # 4. If blind decoding succeeds, the UE obtains downlink scheduling information from the DCI.
- the downlink scheduling information obtained from the DCI may include information on the start subframe and / or the number of subframes to which PDSCH / PUSCH transmission is allocated. If the downlink scheduling information indicates the start subframe of the subframe to which the PDSCH transmission is assigned indicates SF # 6 and the number of the subframes to which the PDSCH transmission is assigned to four, the UE indicates data in SF # 6 to SF # 9. After soft combining, perform decoding.
- the base station transmits information on starting subframes of a plurality of subframes in which DCI is read-backed through higher layer signaling to the terminal (S810).
- the information on the starting subframe may include a value of a specific subframe index (or subframe number) indicating a starting point and a value of a period for the starting subframe to be periodically repeated.
- the information about the starting subframe includes one or more of an N value representing a frame period and 10 * N subframe indexes. It may be information indicating a subframe index.
- the information indicating the subframe index may be a bitmap consisting of 10 * N bits.
- the base station transmits bit indexes 1 and 13 to '1' in the bitmap and the remaining bit indexes to '0'
- the UE transmits SF # 1 of the first frame and SF # 3 of the second frame in two frame periods. May be considered as a starting subframe in which DCI is transmitted. If the transmission period of the start subframe is a preset value (for example, 1 frame), the period value may be omitted.
- subframe configuration information of 'EPDCCH-Config information element' transmitted through higher layer signaling for EPDCCH transmission may be considered as starting subframe information of EPDCCH.
- the terminal performs blind decoding after soft combining the DCI received values based on the information on the start subframe of the plurality of subframes (S820). Since the terminal does not know the number of the plurality of subframes, the terminal performs soft combining from the starting subframe until the blind decoding succeeds.
- the UE obtains scheduling information of the PDSCH transmission resource or the PUSCH transmission resource included in the DCI (S830).
- the DCI includes information on the number of subframes in which the DCI is repeatedly transmitted.
- the UE determines the DCI based on the information on the start subframe of the plurality of subframes in which the DCI received through higher layer signaling is repeatedly transmitted and the information on the number of the plurality of subframes in which the DCI included in the DCI is repeatedly transmitted. It can be seen that the repeated subframe is transmitted, thereby predicting the transmission subframe of the PDSCH / PUSCH.
- the terminal receives the PDSCH or transmits the PUSCH based on the obtained scheduling information (S840).
- the UE when the UE receives configuration information in which SF # 1 is set as a starting subframe through higher layer signaling, the UE soft-combines DCI values in a subframe consecutive from SF # 1 and then blind decoding. Do this. If the blind decoding succeeds, the UE extracts information on the number of subframes in which the DCI is repeatedly transmitted from the DCI, and predicts the subframe in which the PDSCH is transmitted based on the information.
- the DCI is repeatedly transmitted through four subframes of SF # 1 to SF # 4, but the UE soft-combines the DCI transmitted through PDCCH in three subframes of SF # 1 to SF # 3. Even if the blind decoding is successful, the UE may know that the DCI is transmitted up to SF # 4 based on the information on the number of subframes in which the DCI included in the DCI is repeatedly transmitted. Previously, data will not be received through the PDSCH or transmitted through the PUSCH.
- FIG. 10 illustrates an example of a method in which a coverage extended terminal blind decodes a PDCCH and receives a PDSCH when the PDCCH / EPDCCH and the PDSCH are repeated in the same subframes.
- the base station repeatedly transmits one DCI to four subframes of SF # 1 to SF # 4 in consideration of a channel condition of the terminal.
- the UE soft-combines all the transmission values of the DCI information transmitted from SF # 1 to SF # 4 and blindly decodes the result of the CRC check. Perform decoding.
- PDSCH transmission resources are allocated starting from SF # 1, which is the first subframe in which the PDCCH is transmitted.
- the UE since the UE cannot grasp the PDSCH allocation information until the blind decoding of the PDCCH succeeds, the UE transmits the PDSCH transmitted from SF # 1 to SF # 4, which is a PDCCH transmission start subframe until the blind decoding succeeds. Requires a PDSCH buffer that can store the received value.
- the UE may know through higher layer signaling that the PDCCH is transmitted in four subframes with respect to one DCI. However, since the UE cannot know from which subframe DCI is transmitted, the UE always soft combines DCI received values and performs blind decoding on four consecutive subframes.
- the base station repeatedly transmits the PDCCH for four subframes from SF # 1 to SF # 4, and the PDSCH also repeatedly transmits for four subframes from SF # 1 to SF # 4.
- the UE soft-combines the DCI reception values for four subframes from SF # 0 to SF # 3 and the blind decoding is successful, the UE performs PDSCH and four subframes from SF # 0 to SF # 3. It can be determined that it has been transmitted repeatedly.
- the UE may need to know information about the start subframe of the plurality of subframes in which the DCI is repeatedly transmitted.
- the base station when the terminal acquires scheduling information of the PDSCH transmission resources, the base station delivers information on the number of subframes to be repeated to the terminal through higher layer signaling, and transmits starting subframe information of the repeated subframes to the DCI. It can be included and delivered. If the UE soft-combines the DCI received values for four subframes from SF # 0 to SF # 3 and the blind decoding succeeds, when the start subframe is determined to be SF # 1 based on the DCI, the UE transmits the PDCCH. It can be seen that the resource and the PDSCH transmission resource are allocated to four subframes from SF # 1 to SF # 4.
- FIG. 10 illustrates a case in which a PDCCH and a PDSCH are repeatedly transmitted in the same subframe, but the present embodiment may be applied to any case in which there is a relationship between a subframe in which the PDCCH is repeatedly transmitted and a subframe in which the PDSCH is repeatedly transmitted.
- Can be That is, when the subframe in which the PDSCH is repeatedly transmitted is determined based on the subframe in which the PDCCH is repeatedly transmitted, the subframe in which the PDSCH is repeatedly transmitted is also incorrectly determined when the subframe in which the PDCCH is repeatedly transmitted is incorrectly determined. Can be.
- the UE may incorrectly determine that PDSCH is transmitted from SF # 4 to SF # 7.
- the information of the starting subframe included in the DCI can prevent the transmission resource of the PDSCH from being incorrectly determined.
- FIG. 11 illustrates a DCI transmission / reception method according to the third embodiment.
- the base station transmits information on the number of a plurality of subframes in which DCI is repeatedly transmitted through higher layer signaling to the terminal (S1110).
- the terminal performs blind decoding after soft combining the DCI received values in the plurality of subframes based on the information on the number of the plurality of subframes (S1120).
- the UE performs blind decoding after soft combining the DCI received values at the subframe indexes k-N + 1 to k.
- the terminal extracts information included in the DCI (S1130).
- the DCI may include scheduling information of the PDSCH transmission resource or the PUSCH transmission resource.
- the DCI may include information on the start subframe of the plurality of subframes in which the DCI is repeatedly transmitted.
- the UE determines the DCI based on the information on the number of subframes in which the DCI received through higher layer signaling is repeatedly transmitted and the information on the start subframe of the plurality of subframes in which the DCI included in the DCI is repeatedly transmitted. It can be seen that the repeated subframe is transmitted, thereby predicting the transmission subframe of the PDSCH / PUSCH.
- the terminal receives the PDSCH or transmits the PUSCH based on the obtained scheduling information (S1140).
- the UE when the UE receives configuration information that is set to be repeatedly transmitted in four subframes through higher layer signaling, the UE receives a DCI value in four consecutive subframes including the current subframe. After soft combining, blind decoding is performed. If the blind decoding is successful, the UE extracts information on the starting subframe of the subframe in which the DCI is repeatedly transmitted from the DCI, and predicts the subframe in which the PDSCH is transmitted based on the information.
- the DCI is repeatedly transmitted through four subframes of SF # 1 to SF # 4, but the UE soft-combines the DCI transmitted through PDCCH in four subframes of SF # 0 to SF # 3. Even when blind decoding is successful, the UE may know that the DCI is transmitted from SF # 1 to SF # 4 based on the information on the number of subframes in which the DCI included in the DCI is repeatedly transmitted.
- the subframe transmitted may be known.
- FIG. 13 shows a DCI transmission / reception method according to the fourth embodiment.
- the base station transmits information on the maximum value (Nmax) of the number of one or more subframes in which DCI is repeatedly transmitted through higher layer signaling to the terminal (S1310).
- the terminal performs blind decoding after soft combining the DCI received values in the plurality of subframes (S1320).
- the terminal soft combines the DCI received values in one or more consecutive subframes including the current subframe, but the number of the consecutive one or more subframes is limited by the maximum value (Nmax).
- Nmax the maximum value
- the UE sequentially increases the number of subframes that perform soft combining starting from one subframe until the blind decoding succeeds. This process continues until the number of subframes for soft combining becomes the maximum value Nmax.
- the terminal extracts information included in the DCI (S1130).
- the DCI may include scheduling information of the PDSCH transmission resource or the PUSCH transmission resource.
- the DCI may include information on the start subframe of the plurality of subframes in which the DCI is repeatedly transmitted and information on the number of the plurality of subframes in which the DCI is repeatedly transmitted.
- the UE successfully decodes the blind the UE does not acquire information of the subframe in which the PDSCH / PUSCH is scheduled based on the soft frame-combined subframe, but the start sub of the plurality of subframes in which DCI included in the DCI is repeatedly transmitted Based on the information on the frame and the information on the number of the plurality of subframes in which the DCI is repeatedly transmitted, the subframe in which the DCI is repeatedly transmitted can be known, and thus the transmission subframe of the PDSCH / PUSCH can be predicted.
- the terminal receives the PDSCH or transmits the PUSCH based on the obtained scheduling information (S1340).
- the terminal receives configuration information in which Nmax is set to 4 through higher layer signaling.
- the UE performs blind decoding after soft combining the DCI values in one or more consecutive subframes including the current subframe.
- the number of consecutive subframes for soft combining may be 1 to 4 (Nmax).
- the UE extracts information on the starting subframe of the subframe in which the DCI is repeatedly transmitted from the DCI and information on the number of subframes in which the DCI is repeatedly transmitted, and the PDSCH is transmitted based on the information. Predict the subframe to be.
- the DCI is repeatedly transmitted through four subframes of SF # 1 to SF # 4, but the UE soft-combines the DCI transmitted through PDCCH in three subframes of SF # 2 to SF # 4. Even if the blind decoding is successful, the UE starts from SF # 1 based on the information on the start subframe of the subframe in which the DCI included in the DCI is repeatedly transmitted and the information on the number of subframes in which the DCI is repeatedly transmitted. Since the DCI is transmitted until SF # 4, the UE may know the subframe in which the PDSCH is transmitted.
- the present invention is not limited thereto, and the present invention may be applied even when the EPDCCH is repeatedly transmitted in a plurality of subframes.
- the above embodiments have been described mainly by exemplifying scheduling information for receiving a PDSCH, the present invention is not limited thereto, and the present invention may be applied to scheduling information for transmitting a PUSCH.
- Embodiments 1, 2, or 4 may be used for repetitive transmission of DCI necessary for PUSCH resource allocation
- Embodiments 3 or 4 may be used for repetitive transmission of DCI required for PDSCH resource allocation.
- FIG. 15 illustrates a configuration of a terminal according to an embodiment of the present invention.
- the terminal 1500 includes a receiver 1510, a transmitter 1520, and a controller 1530.
- the terminal 1500 is a terminal (eg, an MTC terminal) having extended coverage and may receive downlink control information through a downlink control channel repeatedly allocated in a plurality of subframes.
- the receiver 1510 may receive configuration information through higher layer signaling.
- the configuration information may include, for example, at least one of information on a start subframe of a plurality of subframes, information on the number of the plurality of subframes, and information on a maximum number of the plurality of subframes. It is not limited and may not include all of them.
- the receiver 1510 may receive a combination of downlink control channels repeatedly allocated in the plurality of subframes based on the configuration information.
- the controller 1530 extracts downlink control information from the received downlink control channel.
- the controller 1530 may control the receiver 1510 to receive downlink data based on the downlink scheduling information.
- the controller 1530 may control the transmitter 1520 to transmit uplink data based on the uplink scheduling information.
- the receiver 1510 When the configuration information includes information on the start subframe of the plurality of subframes and information on the number of the plurality of subframes, the receiver 1510 is based on the information on the start subframe and the information on the number of subframes.
- the downlink control channel may be repeated to determine a plurality of allocated subframes.
- the receiver 1510 may receive a downlink control channel through the determined plurality of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated may be determined based on the information on the start subframe included in the configuration information and the information on the number of subframes (Embodiment 1).
- the receiver 1510 may establish a downlink control channel through a plurality of subframes consecutive from the start subframe based on the information on the start subframe. Can be received.
- the downlink control information may include information on the number of the plurality of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated may be determined based on the information on the start subframe included in the configuration information and the information included in the number of subframes included in the downlink control information. (Example 2).
- the receiver 1510 may transmit the N subframes consecutively up to the current subframe based on the information about the number N of the subframes.
- a downlink control channel can be received.
- the downlink control information may include information on the start subframe of the plurality of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated may be determined based on the information about the number of subframes included in the configuration information and the starting subframe included in the downlink control information. (Example 3).
- the receiver 1510 receives the downlink control channel through one or more subframes continued up to the current subframe,
- the downlink control channel can be received while increasing the number of subframes from 1 to Nmax.
- the downlink control information may include information about the start subframe of the plurality of subframes and information about the number of the plurality of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated may be determined based on the information on the start subframe included in the downlink control information and the information on the number of subframes (Embodiment 4). ).
- FIG. 16 shows a configuration of a base station according to an embodiment of the present invention.
- the base station 1600 includes a receiver 1610, a transmitter 1620, and a controller 1630.
- the base station 1600 may transmit downlink control information to a terminal (eg, an MTC terminal) having extended coverage through a downlink control channel repeatedly allocated in a plurality of subframes.
- a terminal eg, an MTC terminal
- the transmitter 1620 may transmit configuration information through higher layer signaling.
- the configuration information may include at least one of information about a start subframe of the plurality of subframes, information about the number of the plurality of subframes, and information about a maximum number of the plurality of subframes, but is not limited thereto. And may not include all of them.
- the transmitter 1620 may repeatedly transmit a downlink control channel in the plurality of subframes.
- the controller 1630 may control the transmitter 1620 to transmit downlink data according to the downlink scheduling information.
- the controller 1630 may control the receiver 1610 to receive uplink data according to the uplink scheduling information.
- the configuration information may include information about the start subframe of the plurality of subframes and information about the number of the plurality of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated in the terminal receiving the downlink control information is determined based on the information on the start subframe included in the configuration information and the information on the number of subframes. (Example 1).
- the configuration information may include information about the start subframe of the plurality of subframes.
- the downlink control information may include information about the number of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated in the terminal receiving the downlink control information includes information about the starting subframe included in the configuration information and the number of subframes included in the downlink control information. It may be determined based on the information included in the second embodiment.
- the configuration information may include information about the number of the plurality of subframes.
- the downlink control information may include information about the start subframe of the plurality of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated in the terminal that receives the downlink control information includes information on the number of subframes included in the configuration information and the starting subframe included in the downlink control information. It can be determined based on the information on (Example 3).
- the configuration information may include information about the maximum value Nmax of the number of subframes.
- the downlink control information may include information about the start subframe of the plurality of subframes and information about the number of the plurality of subframes.
- the information on the subframe to which the uplink data channel or the downlink data panel is allocated in the terminal receiving the downlink control information is based on the information on the start subframe and the number of subframes included in the downlink control information. Can be determined (Example 4).
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Abstract
Description
Claims (15)
- 단말이 복수의 서브프레임에서 반복되어 할당된 하향링크 제어 채널을 통해 하향링크 제어 정보를 수신하는 방법으로서,상기 복수의 서브프레임에 대한 구성 정보를 상위계층 시그널링을 통해 수신하는 단계;상기 구성 정보에 기초하여 상기 복수의 서브프레임에서 반복되어 할당된 상기 하향링크 제어 채널을 결합하여 수신하는 단계; 및상기 결합하여 수신된 하향링크 제어 채널로부터 하향링크 제어 정보를 추출하는 단계를 포함하는 하향링크 제어 정보 수신 방법.
- 제 1 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보 및 상기 복수의 서브프레임의 개수에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 수신 방법.
- 제 2 항에 있어서,상기 하향링크 제어 정보는 상기 하향링크 데이터 채널 또는 상기 상향링크 데이터 채널이 할당된 서브프레임의 시작 서브프레임에 대한 정보 및 개수에 대한 정보 중 적어도 하나를 포함하는 것을 특징으로 하는 하향링크 제어 정보 수신 방법.
- 제 1 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보를 포함하고,상기 하향링크 제어 정보는 상기 복수의 서브프레임의 개수에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 수신 방법.
- 제 1 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 개수에 대한 정보를 포함하고,상기 하향링크 제어 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 수신 방법.
- 제 5 항에 있어서,상기 하향링크 제어 정보는 하향링크 데이터 채널 또는 상향링크 데이터 채널이 할당된 서브프레임에 대한 정보를 포함하며,상기 하향링크 데이터 채널은 상기 하향링크 제어 채널이 반복되어 할당된 상기 복수의 서브프레임 또는 상기 복수의 서브프레임과 그 이후의 적어도 하나의 서브프레임에 할당된 것을 특징으로 하는 하향링크 제어 정보 수신 방법.
- 제 1 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 최대 개수에 대한 정보를 포함하고,상기 하향링크 제어 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보 및 상기 복수의 서브프레임의 개수에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 수신 방법.
- 기지국이 복수의 서브프레임에서 반복되어 할당된 하향링크 제어 채널을 통해 하향링크 제어 정보를 송신하는 방법으로서,상기 복수의 서브프레임에 대한 구성 정보를 상위계층 시그널링을 통해 송신하는 단계; 및상기 복수의 서브프레임에서 반복되어 할당된 상기 하향링크 제어 채널을 통해 하향링크 제어 정보를 송신하는 단계를 포함하는 하향링크 제어 정보 송신 방법.
- 제 8 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보 및 상기 복수의 서브프레임의 개수에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 송신 방법.
- 제 9 항에 있어서,상기 하향링크 제어 정보는 하향링크 데이터 채널 또는 상향링크 데이터 채널이 할당된 서브프레임의 시작 서브프레임에 대한 정보 및 개수에 대한 정보 중 적어도 하나를 포함하는 것을 특징으로 하는 하향링크 제어 정보 송신 방법.
- 제 8 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보를 포함하고,상기 하향링크 제어 정보는 상기 복수의 서브프레임의 개수에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 송신 방법.
- 제 8 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 개수에 대한 정보를 포함하고,상기 하향링크 제어 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 송신 방법.
- 제 12 항에 있어서,상기 하향링크 데이터 채널은 상기 하향링크 제어 채널이 반복되어 할당된 상기 복수의 서브프레임에 할당된 것을 특징으로 하는 하향링크 제어 정보 송신 방법.
- 제 8 항에 있어서,상기 구성 정보는 상기 복수의 서브프레임의 최대 개수에 대한 정보를 포함하고,상기 하향링크 제어 정보는 상기 복수의 서브프레임의 시작 서브프레임에 대한 정보 및 상기 복수의 서브프레임의 개수에 대한 정보를 포함하는 것을 특징으로 하는 하향링크 제어 정보 송신 방법.
- 복수의 서브프레임에서 반복되어 할당된 하향링크 제어 채널을 통해 하향링크 제어 정보를 수신하는 단말로서,상기 복수의 서브프레임의 시작 서브프레임에 대한 정보를 포함하는 구성 정보를 상위계층 시그널링을 통해 수신하고, 상기 구성 정보에 기초하여 상기 복수의 서브프레임에서 반복되어 할당된 상기 하향링크 제어 채널을 결합하여 수신하는 수신부; 및상기 결합하여 수신된 하향링크 제어 채널로부터 하향링크 제어 정보를 추출하는 제어부를 포함하며,상기 하향링크 제어 정보는 상기 복수의 서브프레임의 개수에 대한 정보를 포함하는 것을 특징으로 하는 단말.
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JP2018513646A (ja) * | 2015-04-22 | 2018-05-24 | エルジー エレクトロニクス インコーポレイティド | データチャネルを送受信する方法及びlc機器 |
US10313066B2 (en) | 2015-04-22 | 2019-06-04 | Lg Electronics Inc. | Method for transmitting and receiving data channel and LC device |
US10425196B2 (en) | 2015-04-22 | 2019-09-24 | Lg Electronics Inc. | Method for transmitting and receiving data channel, and LC device |
CN107317662A (zh) * | 2016-04-27 | 2017-11-03 | 株式会社Kt | 用于发送和接收上行数据的方法及其装置 |
US10616889B2 (en) | 2016-04-27 | 2020-04-07 | Kt Corporation | Methods for transmitting and receiving uplink data and apparatuses thereof |
CN107317662B (zh) * | 2016-04-27 | 2020-12-08 | 株式会社Kt | 用于发送和接收上行数据的方法及其装置 |
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