WO2016089143A1 - Procédé pour effectuer une transmission de liaison montante sur une sous-trame à laquelle un cp réduit est appliqué et dispositif d'utilisateur - Google Patents

Procédé pour effectuer une transmission de liaison montante sur une sous-trame à laquelle un cp réduit est appliqué et dispositif d'utilisateur Download PDF

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WO2016089143A1
WO2016089143A1 PCT/KR2015/013169 KR2015013169W WO2016089143A1 WO 2016089143 A1 WO2016089143 A1 WO 2016089143A1 KR 2015013169 W KR2015013169 W KR 2015013169W WO 2016089143 A1 WO2016089143 A1 WO 2016089143A1
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reduced
uplink
serving cell
subframe
cell
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PCT/KR2015/013169
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English (en)
Korean (ko)
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정만영
양윤오
이상욱
임수환
황진엽
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엘지전자 주식회사
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Publication of WO2016089143A1 publication Critical patent/WO2016089143A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • the present invention relates to mobile communications.
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • LTE-A 3GPP LTE-Advanced
  • radio resources on a time axis are divided into radio frame units.
  • the radio frame includes 10 subframes, and one subframe includes two slots.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols. How many OFDM symbols are included in one slot may vary depending on a cyclic prefix (CP).
  • OFDM orthogonal frequency division multiplexing
  • LTE / LTE-A a normal CP and an extended CP are used.
  • the small cell to be introduced in the next system is located in the vicinity of the terminal, it is expected to secure a line of sight (LoS) of near and propagation.
  • LoS line of sight
  • the propagation delay may be relatively small compared to the existing, the existing CP length may be unnecessarily long.
  • the present disclosure aims to solve the above-mentioned problem.
  • one disclosure of the present specification provides a method for a user equipment to perform uplink transmission on a subframe to which a reduced cyclic prefix (CP) is applied.
  • the method includes receiving a signal on whether to apply a CP of a length shorter than a normal CP from a serving cell; Receiving an uplink resource allocation from the serving cell;
  • the method may include performing uplink transmission by applying a reduced CP on the uplink subframe. In this case, unnecessary radiation can be suppressed by applying a filter or a time-domain windowing technique to an idle section generated between symbols by applying the reduced CP.
  • the method may further include delivering capability information including information indicating whether the user equipment supports the reduced CP to the serving cell.
  • the method may further comprise performing a measurement on the serving cell and transmitting a measurement report including information on the maximum transmission delay. Whether to apply the reduced length CP may be determined by the serving cell based on the maximum transmission delay.
  • the method comprises the steps of: receiving a network signal comprising an Additional Maximum Power Reduction (A-MPR) value from the serving cell;
  • the method may further include determining a transmission power on an uplink subframe to which the reduced CP is applied based on the A-MPR value.
  • A-MPR Additional Maximum Power Reduction
  • the A-MPR value when the reduced CP is applied may be smaller than the A-MPR value when the general CP is applied.
  • one disclosure of the present specification provides a method for scheduling uplink based on a reduced CP in a base station.
  • the method includes receiving capability information from the user device, the capability information comprising information indicating whether to support the reduced CP; Determining whether to apply a reduced CP to the UE based on the capability information; If it is determined to apply the reduced CP to the UE, determining an uplink subframe to which the reduced CP is to be applied; Transmitting an uplink grant including resource allocation on the uplink subframe.
  • the method may further comprise receiving a measurement report comprising information about the maximum transmission delay from the user device. Whether to apply the reduced CP to the UE may be determined based on the maximum transmission delay.
  • the method includes determining an Additional Maximum Power Reduction (A-MPR) value for the user device to which the reduced CP is to be applied;
  • the method may further include transmitting a network signal including the determined A-MPR value to the user device.
  • A-MPR Additional Maximum Power Reduction
  • one disclosure of the present disclosure also provides a user device for performing uplink transmission on a subframe to which a reduced cyclic prefix (CP) is applied.
  • the user device includes: a transceiver; And it may include a processor for controlling the transceiver.
  • the processor may include: receiving a signal on whether to apply a CP having a length shorter than a normal CP from a serving cell; Receiving an uplink resource allocation from the serving cell; A process of performing uplink transmission may be performed by applying a reduced CP on the corresponding uplink subframe.
  • the transmitter / receiver may suppress unwanted radiation by applying a filter or a time-domain windowing technique to an idle section generated between symbols by applying the reduced CP.
  • 1 is an exemplary view showing a wireless communication system.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • 3 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
  • 5 shows a structure of an uplink subframe in 3GPP LTE.
  • FIG. 6 is a diagram illustrating an environment of a mixed heterogeneous network of macro cells and small cells, which may be a next generation wireless communication system.
  • CA 7 shows an example of using a licensed band and an unlicensed band as carrier aggregation (CA).
  • CA carrier aggregation
  • FIG. 8 illustrates an example of a reduced CP length in accordance with the disclosure herein.
  • 9A illustrates an example in which a transmitter determines a CP length according to a maximum transmission delay of a channel measured by a receiver.
  • 9B illustrates an example of determining a CP length according to a maximum transmission delay of a channel arbitrarily estimated by a transmitter.
  • FIG. 10 illustrates a concept of a correlator for time synchronization at a receiving end.
  • FIG. 11 is an exemplary diagram illustrating subframes to which different CP lengths are applied according to the disclosure of the present specification.
  • FIG. 12A is an exemplary diagram illustrating two OFDM symbols
  • FIG. 12B is an exemplary diagram illustrating unnecessary radiation when the time-domain windowing technique is not applied
  • FIG. 12C is a conceptual diagram illustrating the concept of a time-domain windowing technique.
  • FIG. 12D shows an example in which unwanted radiation is removed by the application of the time-domain windowing technique.
  • FIG. 13 shows an example of applying a reduced CP in the TDD-eIMTA technology.
  • 14A and 14B are exemplary views illustrating a method of limiting transmission power of a terminal.
  • 15 is a signal flow diagram summarizing the disclosure of the present specification.
  • 16 is a block diagram illustrating a wireless communication system in which the present disclosure is implemented.
  • LTE includes LTE and / or LTE-A.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • base station which is used hereinafter, generally refers to a fixed station for communicating with a wireless device, and includes an evolved-nodeb (eNodeB), an evolved-nodeb (eNB), a base transceiver system (BTS), and an access point (e.g., a fixed station). Access Point) may be called.
  • eNodeB evolved-nodeb
  • eNB evolved-nodeb
  • BTS base transceiver system
  • access point e.g., a fixed station.
  • UE User Equipment
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • MT mobile terminal
  • 1 is an exemplary view showing a wireless communication system.
  • a wireless communication system includes at least one base station (BS) 20.
  • Each base station 20 provides a communication service for a particular geographic area (generally called a cell) 20a, 20b, 20c.
  • the UE typically belongs to one cell, and the cell to which the UE belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are determined relatively based on the UE.
  • downlink means communication from the base station 20 to the UE 10
  • uplink means communication from the UE 10 to the base station 20.
  • the transmitter may be part of the base station 20 and the receiver may be part of the UE 10.
  • the transmitter may be part of the UE 10 and the receiver may be part of the base station 20.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • the radio frame illustrated in FIG. 2 may refer to section 5 of 3GPP TS 36.211 V10.4.0 (2011-12) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)".
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • Physical Channels and Modulation Release 10
  • a radio frame includes 10 subframes, and one subframe includes two slots. Slots in a radio frame are numbered from 0 to 19 slots.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI may be referred to as a scheduling unit for data transmission.
  • one radio frame may have a length of 10 ms
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • one slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols. How many OFDM symbols are included in one slot may vary depending on a cyclic prefix (CP).
  • OFDM orthogonal frequency division multiplexing
  • 3 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
  • an uplink slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and NRB resource blocks (RBs) in a frequency domain.
  • OFDM orthogonal frequency division multiplexing
  • RBs resource blocks
  • the number of resource blocks (Resource Block RB), that is, the NRB may be any one of 6 to 110.
  • the RB is also called a physical resource block (PRB).
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
  • the number of subcarriers in one OFDM symbol can be used to select one of 128, 256, 512, 1024, 1536 and 2048.
  • a resource grid for one uplink slot may be applied to a resource grid for a downlink slot.
  • FIG. 4 it is illustrated that 7 OFDM symbols are included in one slot by assuming a normal CP.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
  • PDCH physical downlink control channel
  • physical channels include a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid (PHICH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PDCCH physical downlink control channel
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid
  • ARQ Indicator Channel Physical Uplink Control Channel
  • the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
  • CFI control format indicator
  • the wireless device first receives the CFI on the PCFICH and then monitors the PDCCH.
  • the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
  • the PHICH carries a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal for a UL hybrid automatic repeat request (HARQ).
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • HARQ UL hybrid automatic repeat request
  • the ACK / NACK signal for uplink (UL) data on the PUSCH transmitted by the wireless device is transmitted on the PHICH.
  • the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
  • the PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
  • MIB master information block
  • SIB system information block
  • the PDCCH includes resource allocation and transmission format of downlink-shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, and random access transmitted on PDSCH. Resource allocation of higher layer control messages such as responses, sets of transmit power control commands for individual UEs in any UE group, activation of voice over internet protocol (VoIP), and the like.
  • a plurality of PDCCHs may be transmitted in the control region, and the UE may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • DCI downlink control information
  • PDSCH also called DL grant
  • PUSCH resource allocation also called UL grant
  • VoIP Voice over Internet Protocol
  • the base station determines the PDCCH format according to the DCI to be sent to the UE, and attaches a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • the CRC masks a unique radio network temporary identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific UE, a unique identifier of the UE, for example, a cell-RNTI (C-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, p-RNTI (P-RNTI), may be masked to the CRC.
  • RNTI radio network temporary identifier
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • blind decoding is used to detect the PDCCH.
  • Blind decoding is a method of demasking a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • the base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches the CRC to the DCI, and masks a unique identifier (RNTI) to the CRC according to the owner or purpose of the PDCCH.
  • RNTI unique identifier
  • the uplink channel includes a PUSCH, a PUCCH, a sounding reference signal (SRS), and a physical random access channel (PRACH).
  • PUSCH PUSCH
  • PUCCH Physical Uplink Control Channel
  • SRS sounding reference signal
  • PRACH physical random access channel
  • 5 shows a structure of an uplink subframe in 3GPP LTE.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
  • the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot.
  • the frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • the UE may obtain frequency diversity gain by transmitting uplink control information through different subcarriers over time.
  • m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
  • the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel state, and an uplink radio resource allocation request. (scheduling request).
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK non-acknowledgement
  • CQI channel quality indicator
  • the PUSCH is mapped to the UL-SCH, which is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
  • the transport block may be user information.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
  • control information multiplexed with data may include a CQI, a precoding matrix indicator (PMI), a HARQ, a rank indicator (RI), and the like.
  • the uplink data may consist of control information only.
  • CA Carrier Aggregation
  • the carrier aggregation system refers to aggregating a plurality of component carriers (CC).
  • CC component carriers
  • a cell may mean a combination of a downlink component carrier and an uplink component carrier or a single downlink component carrier.
  • a cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • a primary cell means a cell operating at a primary frequency, and is a cell in which a UE performs an initial connection establishment procedure or a connection reestablishment procedure with a base station, or is indicated as a primary cell in a handover process. It means a cell.
  • the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
  • the carrier aggregation system may be divided into a contiguous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which aggregated carriers are separated from each other.
  • a carrier aggregation system simply referred to as a carrier aggregation system, it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.
  • the number of component carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
  • the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
  • the 3GPP LTE system supports bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the 3GPP LTE-A system may configure a bandwidth of 20 MHz or more using only the bandwidth of the 3GPP LTE system.
  • broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
  • the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
  • the configuration may include a general process of receiving common physical layer parameters required for data transmission and reception, media access control (MAC) layer parameters, or parameters required for a specific operation in the RRC layer.
  • MAC media access control
  • the cell in the configuration complete state may exist in an activation or deactivation state.
  • activation means that data is transmitted or received or is in a ready state.
  • the UE may monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the activated cell in order to identify resources allocated to the UE (which may be frequency, time, etc.).
  • PDCCH control channel
  • PDSCH data channel
  • Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • the UE may receive system information (SI) necessary for packet reception from the deactivated cell.
  • SI system information
  • the UE does not monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the deactivated cell in order to check resources allocated to it (may be frequency, time, etc.).
  • a small cell having a small cell coverage radius is expected to be added within the coverage of an existing cell, and the small cell is expected to handle more traffic. Since the existing cell has greater coverage than the small cell, it may be referred to as a macro cell.
  • a description will be given with reference to FIG. 7.
  • FIG. 6 is a diagram illustrating an environment of a mixed heterogeneous network of macro cells and small cells, which may be a next generation wireless communication system.
  • a macro cell by an existing base station 200 is a heterogeneous network environment in which a macro cell overlaps with a small cell by one or more small base stations 300a, 300b, 300c, and 300d. Since the existing base station provides greater coverage than the small base station, it is also called a macro base station (Macro eNodeB, MeNB). In this specification, the terms macro cell and macro base station are used interchangeably.
  • the UE connected to the macro cell 200 may be referred to as a macro UE.
  • the macro UE receives a downlink signal from the macro base station and transmits an uplink signal to the macro base station.
  • the macro cell is set as the primary cell and the small cell is set as the secondary cell, thereby filling the coverage gap of the macro cell.
  • the small cell is set as the primary cell (Pcell) and the macro cell as the secondary cell (Scell), it is possible to improve the overall performance (boosting).
  • the illustrated small cells 300b and 300c may expand or reduce their coverage in order to reduce interference effects on other adjacent small cells 300a and 300d or the macro cell 200 according to a situation. Such expansion and contraction of coverage is called cell breathing. Alternatively, the small cells 300b and 300c may be turned on or off depending on the situation.
  • LTE-U LTE-U
  • CA 7 shows an example of using a licensed band and an unlicensed band as carrier aggregation (CA).
  • CA carrier aggregation
  • the small cell base station 300 may transmit a signal to the UE 100 or the UE may transmit a signal to the small cell base station.
  • the carrier of the licensed band may be interpreted as a primary CC (can be referred to as PCC or PCell), and the carrier of the unlicensed band may be interpreted as a secondary CC (can be referred to as SCC or SCell).
  • LTE-U is also referred to as licensed-assisted access (LTE-LAA).
  • LTE / LTE-A a current mobile communication system, uses a scheme based on OFDMA in downlink and SC-FDMA in uplink. Further, even in the next generation mobile communication system in which small cells and technologies such as LTE-U or LTE-LAA are expected to be introduced, OFDMA / SC-FDMA is expected to be used as the current communication method.
  • the length of a cyclic prefix is designed in consideration of the maximum delay of a channel in order to prevent inter-symbol interference (ISI) in a large cell radius.
  • the small cell to be introduced in the next system is located in the vicinity of the UE, it is expected to secure line of sight (LoS) of near and propagation.
  • LoS line of sight
  • the propagation delay may be relatively small compared to the macro cell environment, the cyclic prefix (CP) length presented in the existing 3GPP LTE Release-10 system may be unnecessarily long.
  • the present specification proposes a shortened CP that occupies a number of samples shorter or smaller than the CP (cyclic prefix) length proposed in the existing 3GPP LTE Release-10 system.
  • the reduced CP means shorter than the normal CP length.
  • the present specification proposes a method of applying different CP lengths to each maximum path delay in order to minimize resources wasteful by unnecessary long CP lengths.
  • FIG. 8 illustrates an example of a reduced CP length in accordance with the disclosure herein.
  • the first reduced CP may be shorter in length than the normal CP.
  • the second reduced CP may have a shorter length than the first reduced CP.
  • each cell may independently apply CP lengths to the respective UEs to prevent ISI, resulting in waste of resources and lower transmission power.
  • a method for knowing the maximum transmission delay of each cell there may be a method in which the transmitter reports the maximum transmission delay of the channel measured by the receiver, and a method in which each transmitter arbitrarily estimates the channel.
  • the maximum transmission delay of the channel is basically possible through channel estimation at the receiving end. Therefore, when the receiving end reports the statistics of the maximum delay obtained through its channel estimator to the transmitting end, the transmitting end may apply only the CP of the minimum length accordingly.
  • this section informs the transmitting end of the transmission delay value of the channel measured by the receiving end, so that the transmitting end can apply a variable length CP.
  • 9A illustrates an example in which a transmitter determines a CP length according to a maximum transmission delay of a channel measured by a receiver.
  • a receiver measures a channel based on a signal received from a transmitter.
  • the maximum transmission delay of the channel is also estimated during the channel measurement.
  • the receiving end transmits the maximum transmission delay of the channel to the transmitting end while performing the measurement report.
  • the UE transmits the measurement report for the downlink channel to the cell, and the transmission delay for the uplink channel is informed to the UE through a timing adjustment procedure.
  • the method proposed in this section can be implemented.
  • the transmitter can determine the CP length to be applied to the subframe to be transmitted based on the maximum transmission delay value of the channel informed by the receiver.
  • the maximum transmission delay of the channel is usually measured at the receiver.
  • the transmission channel and the reception channel use the same frequency, and thus, the maximum transmission delay of the channel estimated in the previously received subframe may be the same as the delay of the channel delayed during transmission.
  • the base station or the UE may determine the CP length to be applied to the transmission subframe based on the maximum transmission delay of the channel estimated from the reception subframe.
  • 9B illustrates an example of determining a CP length according to a maximum transmission delay of a channel arbitrarily estimated by a transmitter.
  • a transmitter measures a channel based on a signal received from a receiver.
  • the maximum transmission delay of the channel is also estimated during the channel measurement.
  • the transmitter can determine the CP length to be applied to the subframe to be transmitted based on the maximum transmission delay value of the channel informed by the receiver.
  • synchronization is typically performed by applying a correlation between a section corresponding to a CP of an OFDM symbol and a data section.
  • a correlator that obtains a correlation performs time synchronization by calculating a correlation between a received signal and a signal delayed by a predetermined FFT size while moving a predetermined window size.
  • FIG. 10 illustrates a concept of a correlator for time synchronization at a receiving end.
  • the performance of the correlator as shown in FIG. 10 is basically proportional to the window size.
  • the performance of the correlator is basically limited by the reduced CP length.
  • the environment in which variable length CP is used is expected to have a small maximum transmission delay as a near channel.
  • the reduced performance of the correlator may be compensated for due to the reduced CP length.
  • this section proposes that the sliding buffer in the correlator of the receiver can be dynamically changed by the reduced CP length.
  • the sliding buffer in the correlator of the receiver can be dynamically changed by the reduced CP length.
  • the receiving end needs to inform the transmitting end of the capability. Accordingly, the transmitter needs to distinguish among receivers to which the reduced CP length can be applied among several receivers.
  • the receiving end may transmit information to the cell by including information on whether the reduced CP length can be applied in information on its capability (ie, UE Capability Information).
  • the transmitting end may inform the UE whether the reduced CP length can be applied.
  • this section proposes the following signaling.
  • SupportVariableCP Signaling whether the UE supports a reduced CP length in downlink or whether the CP length can be changed over time to the serving cell
  • EnableVariableCP signaling indicating whether the serving cell supports a reduced CP length in uplink or whether the CP length can be changed in time
  • the OFDMA scheme applied in LTE / LTE-A allows a plurality of UEs to be allocated to different frequency resources on the same OFDM symbol. Although a plurality of UEs are allocated to different frequency resources on the frequency axis, when operating on one OFDM symbol on the time axis, the same CP length should be applied to the plurality of UEs. Therefore, it is effective to schedule the UE according to the UE indicating the maximum transmission delay of similar length. An example of such group scheduling is shown in FIG. 11.
  • FIG. 11 is an exemplary diagram illustrating subframes to which different CP lengths are applied according to the disclosure of the present specification.
  • a normal CP may be applied to any subframe (eg, subframe 0).
  • a first reduced CP may be applied to another subframe (eg, subframe 3), and a second reduced CP may be applied to another subframe (eg, subframe 7).
  • the serving cell may resource schedule a plurality of UEs having a similar maximum transmission delay on subframe 0 to which the normal CP is applied. In addition, the serving cell may resource schedule a plurality of UEs having a similar maximum transmission delay on subframe 3 to which the first reduced CP is applied.
  • the serving cell When using such a group scheduling scheme in the downlink, the serving cell only needs to group a plurality of UEs having similar maximum transmission delays, and the UE does not need any improvement.
  • the UE uses a reduced CP
  • the idle interval caused by the reduced CP as a transition period between the previous OFDM symbol and the current OFDM symbol
  • variably filter or time-domain windowing time By applying the -domain windowing technique, it is possible to reduce the discontinuity of the time domain signal, thereby reducing unnecessary radiation emitted in and out of band.
  • the time-domain windowing technique is a technique that can reduce unnecessary radiation by applying a window defined in the time domain between adjacent symbols in an OFDM system to smooth the transition between adjacent symbols.
  • FIG. 12A is an exemplary diagram illustrating two OFDM symbols
  • FIG. 12B is an exemplary diagram illustrating unnecessary radiation when the time-domain windowing technique is not applied
  • FIG. 12C is a conceptual diagram illustrating the concept of a time-domain windowing technique.
  • FIG. 12D shows an example in which unwanted radiation is removed by the application of the time-domain windowing technique.
  • symbol n is cosine, but symbol n + 1 is sine, and two symbols are discontinuous as indicated by ellipses. If these two discontinuous symbols are transmitted without the time-domain windowing technique applied, undesired radiation will appear, as indicated by ellipses in FIG. 12B.
  • a transition between the two symbols can be smoothed as can be seen with reference to FIG. 12C.
  • This is the time domain windowing technique. That is, the time domain windowing technique is to smoothly connect the end of the first symbol and the start of the second symbol in the time domain to smooth the transition between the two symbols.
  • unnecessary radiation may be reduced and EVM may be increased.
  • the effect of applying the reduced CP may be increased in the A-MPR scheme according to the TDD-eIMTA technique and the network signaling (NS) signal.
  • TDD-eIMTA technology is a technology that can increase the transmission rate of the entire system by dynamically converting a subframe allocated as a basic uplink (UL) to a downlink (DL) in a TDD system. have.
  • interference is affected by an uplink signal of another cell.
  • the serving cell schedules an uplink transmission to the UE in the uplink subframe
  • the serving cell is reduced to the UE.
  • the uplink transmission of the UE is unnecessary to the frequency domain on the downlink subframe switched in the uplink subframe by the neighboring cell.
  • the radiation is limited.
  • FIG. 13 shows an example of applying a reduced CP in the TDD-eIMTA technology.
  • the serving cell uses TDD UL / DL configuration 0.
  • the neighbor cell to which the eIMTA is applied is changed from TDD UL / DL configuration 0 to TDD UL / DL configuration 2.
  • Subframes 3, 4, 8, and 9 are converted to downlink instead of uplink by the neighboring cell to which the eIMTA is applied. Since the serving cell operates as it is with the existing UL / DL configuration 0, large interference caused by uplink transmission of the UE is introduced into the frequency resource on the downlink subframe switched from the uplink subframe by the neighboring cell. System performance is reduced.
  • the interference can be mitigated. That is, when the UE uses the reduced CP on the corresponding subframe and applies a time-domain windowing technique, the uplink transmission of the UE is performed on the downlink subframe switched in the uplink subframe by the neighbor cell. Undesired radiation in the frequency domain is limited.
  • 14A and 14B are exemplary views illustrating a method of limiting transmission power of a terminal.
  • performing transmission in an allocated channel band causes unwanted emission to adjacent channels.
  • the interference due to the radiation caused by the base station transmission can reduce the amount of interference introduced into the adjacent band by the high cost and the design of a large size RF filter due to the characteristics of the base station to less than the allowed criteria.
  • it is difficult to completely prevent the entry into the adjacent band due to the size limitation and the price limit for the power amplifier or pre-duplex filter RF device.
  • the UE 100 performs transmission by limiting transmission power.
  • the maximum power reduction (MPR) value decreases the linearity of the power amplifier (PA) when the peak-to-average power ratio (PAPR) is large.
  • a maximum MPR value of 2dB can be applied.
  • the base station transmits a network signal (NS) to the UE (100) may apply A-MPR (Additional Maximum Power Reduction).
  • A-MPR Additional Maximum Power Reduction
  • the A-MPR transmits a network signal (NS) to the UE 100 operating in a specific operating band, so that the base station transmits a network signal (NS) to the UE 100 to operate in a specific operating band.
  • the transmission power is additionally determined by applying the A-MPR.
  • the operation of the UE in the situation where it is necessary to limit the unnecessary radiation by the network signal NS can be improved as follows according to the application of the present invention.
  • the CP length is reduced to match the maximum transmission delay of the channel, and thus the remaining interval is applied by applying the time-domain windowing technique to the previous OFDM symbol and the current OFDM symbol interval. Restrict. In this case, the time-domain windowing technique and A-MPR can be mixed properly. In general, the cell coverage radius is reduced when A-MPR is applied. However, by reducing the A-MPR value by the time-domain windowing technique, the cell coverage radius can be somewhat mitigated.
  • the UE can obtain the effect of reducing the transmission power, and can also obtain an additional interference limiting effect due to the reduction of the CP length.
  • the CP section used in each base station is located in the data section of the other base station.
  • the interference limiting effect can be obtained by arranging UEs that require.
  • 15 is a signal flow diagram summarizing the disclosure of the present specification.
  • the serving cell 200a exchanges information with a neighbor cell 200b through an X2 interface.
  • the neighbor cell 200b may inform the serving cell 200a whether it applies the eIMTA.
  • the serving cell 200a requests the UE capability inquiry to the UE 100 as needed or instructed by a higher layer.
  • the UE 100 transmits UE capability information to the serving cell 200a according to the request.
  • the UE capability information may include the aforementioned supportVariableCP.
  • the serving cell 200a determines whether the UE 100 can apply the reduced CP.
  • the serving cell 200a determines whether to apply a reduced CP length based on the maximum transmission delay.
  • the serving cell 200a transmits an RRC signal including EnableVariableCP indicating whether to apply the reduced CP length to the UE 100.
  • the serving cell 200a determines an A-MPR value based on the reduced CP.
  • the value of the A-MPR may be reduced.
  • the required A-MPR value is 3 dB, but if the reduced CP is used, the A-MPR value may be reduced to 1 dB.
  • a network signal including the determined A-MPR value for example, an RRC signal, is transmitted to the UE 100.
  • the serving cell 200a determines a subframe to which the reduced CP is applied.
  • the serving cell 200a determines a plurality of UEs to allocate resources in a subframe determined to apply the reduced CP.
  • the serving cell 200a transmits an uplink grant including uplink resource allocation to the UE 100.
  • the uplink grant may be transmitted on the PDCCH.
  • the UE 100 determines transmission power based on the A-MPR.
  • the UE 100 performs uplink transmission with the determined transmission power on an uplink subframe to which the reduced CP is applied.
  • the UE 100 may limit the unnecessary radiation to the adjacent band by applying the time-domain windowing technique to the effective period generated due to the reduced CP.
  • Embodiments of the present invention described so far may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof. Specifically, it will be described with reference to the drawings.
  • 16 is a block diagram illustrating a wireless communication system in which the present disclosure is implemented.
  • the base station 200 includes a processor 201, a memory 202, and an RF unit (RF (radio frequency) unit) 203.
  • the memory 202 is connected to the processor 201 and stores various information for driving the processor 201.
  • the RF unit 203 is connected to the processor 201 to transmit and / or receive a radio signal.
  • the processor 201 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 201.
  • the UE 100 includes a processor 101, a memory 102, and an RF unit 103.
  • the memory 102 is connected to the processor 101 and stores various information for driving the processor 101.
  • the RF unit 103 is connected to the processor 101 and transmits and / or receives a radio signal.
  • the processor 101 implements the proposed functions, processes and / or methods.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un mode de réalisation de la présente description concerne un procédé par lequel un dispositif d'utilisateur exécute une transmission de liaison montante sur une sous-trame à laquelle un préfixe cyclique (CP) réduit est appliqué. Le procédé peut comprendre les étapes consistant à : recevoir, à partir d'une cellule de desserte, un signal indiquant si un CP ayant une longueur plus réduite que celle d'un CP normal est appliqué ; recevoir, à partir de la cellule de desserte, une allocation de ressources de liaison montante ; et effectuer une transmission de liaison montante en appliquant le CP réduit sur une sous-trame de liaison montante correspondante, le CP réduit étant appliqué de telle sorte qu'une technique de fenêtrage du domaine temporel est appliquée à une section inactive située entre des symboles, supprimant ainsi une émission parasite.
PCT/KR2015/013169 2014-12-05 2015-12-03 Procédé pour effectuer une transmission de liaison montante sur une sous-trame à laquelle un cp réduit est appliqué et dispositif d'utilisateur WO2016089143A1 (fr)

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US62/087,802 2014-12-05

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Citations (5)

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Publication number Priority date Publication date Assignee Title
US20050262178A1 (en) * 2003-11-21 2005-11-24 Bae Systems Plc Suppression of unwanted signal elements by sinusoidal amplitude windowing
US20120033587A1 (en) * 2010-08-03 2012-02-09 Samsung Electronics Co., Ltd. Transmission of uplink control signals in a communication system
US20130260809A1 (en) * 2010-10-20 2013-10-03 Nokia Corporation Method and apparatus for adjacent channel emission limit
JP2014511640A (ja) * 2011-03-08 2014-05-15 パナソニック株式会社 複数のコンポーネント・キャリアに関する伝搬遅延差レポート
WO2014109478A1 (fr) * 2013-01-14 2014-07-17 엘지전자 주식회사 Procédé de détection de petite cellule sur la base d'un signal de découverte

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050262178A1 (en) * 2003-11-21 2005-11-24 Bae Systems Plc Suppression of unwanted signal elements by sinusoidal amplitude windowing
US20120033587A1 (en) * 2010-08-03 2012-02-09 Samsung Electronics Co., Ltd. Transmission of uplink control signals in a communication system
US20130260809A1 (en) * 2010-10-20 2013-10-03 Nokia Corporation Method and apparatus for adjacent channel emission limit
JP2014511640A (ja) * 2011-03-08 2014-05-15 パナソニック株式会社 複数のコンポーネント・キャリアに関する伝搬遅延差レポート
WO2014109478A1 (fr) * 2013-01-14 2014-07-17 엘지전자 주식회사 Procédé de détection de petite cellule sur la base d'un signal de découverte

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