WO2012169815A2 - Procédé et appareil permettant d'émettre un signal de liaison montante dans un système de télécommunication sans fil basé sur le duplexage par répartition dans le temps - Google Patents

Procédé et appareil permettant d'émettre un signal de liaison montante dans un système de télécommunication sans fil basé sur le duplexage par répartition dans le temps Download PDF

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Publication number
WO2012169815A2
WO2012169815A2 PCT/KR2012/004515 KR2012004515W WO2012169815A2 WO 2012169815 A2 WO2012169815 A2 WO 2012169815A2 KR 2012004515 W KR2012004515 W KR 2012004515W WO 2012169815 A2 WO2012169815 A2 WO 2012169815A2
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WIPO (PCT)
Prior art keywords
subframe
uplink
base station
uplink subframe
signal
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PCT/KR2012/004515
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English (en)
Korean (ko)
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WO2012169815A3 (fr
Inventor
박성호
천진영
김기태
김수남
강지원
임빈철
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엘지전자 주식회사
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Priority to JP2014514803A priority Critical patent/JP5680255B2/ja
Publication of WO2012169815A2 publication Critical patent/WO2012169815A2/fr
Publication of WO2012169815A3 publication Critical patent/WO2012169815A3/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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting an uplink signal in a time division duplex (TDD) based wireless communication system.
  • TDD time division duplex
  • the wireless communication system may use a frequency division duplex (FDD) scheme or a time division duplex (TDD) scheme.
  • FDD frequency division duplex
  • TDD time division duplex
  • a downlink transmission in which a base station transmits a signal to a terminal and an uplink transmission in which a terminal transmits a signal to a base station are performed in different frequency bands.
  • the FDD scheme is very efficient where a wide frequency band is guaranteed, and can dynamically handle the asymmetry of downlink / uplink transmission.
  • downlink transmission and uplink transmission are performed at different times in the same frequency band.
  • the TDD scheme may be utilized even when there is a limitation in the frequency band, and is advantageous in the case of mainly using traffic such as voice over internet protocol (VoIP).
  • the TDD scheme has a relatively small cell coverage compared to the FDD scheme due to the limitation of the round trip time (RTT) and also requires a guard period when switching between downlink and uplink transmissions.
  • RTT round trip time
  • Subframe setting means setting each subframe as an uplink subframe, a downlink subframe, or a special subframe in a radio frame.
  • subframe configuration may be limited in the base station unit of the TDD system.
  • one network may not have different subframe configuration. That is, the base stations in the same network are all limited to have the same subframe configuration.
  • Such a TDD system is called a symmetric TDD system. If the influence of the data burden on each base station is not considered in the symmetric TDD system, the inter-cell interference (ICI) in each cell will be constant. In this case, each base station may assume a constant ICI in the time domain, thereby easily performing link-adaptation, power control, etc. with respect to the target SINR.
  • ICI inter-cell interference
  • each base station may perform different link transmission and reception at the same time according to different subframe settings.
  • Such a TDD system is called an asymmetric TDD system.
  • a terminal at a cell coverage boundary of a specific base station is interfered by a signal transmitted by another base station or another terminal.
  • the downlink control channel is particularly sensitive to interference in that it contains system control information.
  • An object of the present invention is to provide an uplink signal transmission method and apparatus in a TDD (Time Division Duplex) based wireless communication system.
  • TDD Time Division Duplex
  • a method of transmitting an uplink signal of a terminal is provided. The method is
  • the subframes overlap each other in the frame and time domain, and the plurality of subframe structures are subframe structures having different reference signal positions.
  • N is a natural number of 1 or more and 4 or less
  • the terminal may transmit an uplink signal by lowering the transmit power of the remaining OFDM symbols in the first N OFDM symbols of the uplink subframe.
  • a reference signal may be transmitted in any one OFDM symbol, the fourth OFDM symbol, and the eleventh OFDM symbol of the first two OFDM symbols of the uplink subframe.
  • a reference signal may be transmitted in any one OFDM symbol and the 11th OFDM symbol of the first three OFDM symbols of the uplink subframe.
  • a reference signal may be transmitted in any one OFDM symbol and the eighth OFDM symbol of the first three OFDM symbols of the uplink subframe.
  • a reference signal may be transmitted in 4th, 7th, and 11th OFDM symbols of the uplink subframe.
  • a reference signal may be transmitted in 3rd, 7th, and 11th OFDM symbols of the uplink subframe.
  • the uplink subframe type information may be received through an uplink grant scheduling the uplink subframe.
  • the uplink subframe type information may be received through an upper layer signal.
  • a terminal in another aspect, includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor connected to the RF unit, wherein the processor receives uplink subframe type information from a first base station, and has one structure among a plurality of predetermined subframe structures according to the uplink subframe type information. And configures an uplink subframe having an uplink subframe, and transmits an uplink signal to the first base station in the configured uplink subframe, wherein the uplink subframe is a downlink control signal at a second base station adjacent to the first base station.
  • a subframe overlapping in a time domain with a downlink subframe for transmitting a Tx subframe structure, wherein the plurality of subframe structures are subframe structures having different reference signal positions.
  • TDD time division duplex
  • FIG. 1 shows a structure of a radio frame.
  • FIG. 2 shows a structure of a TDD radio frame.
  • FIG 3 shows an example of a resource grid for one downlink slot.
  • 5 shows a structure of an uplink subframe.
  • FIG. 6 illustrates inter-cell interference when different UL-DL configurations are used in adjacent cells.
  • cell A is an interference cell and cell B is an interference cell.
  • FIG. 10 shows a subframe structure that can be applied when the first OFDM symbol of the uplink subframe overlaps with the PDCCH transmission OFDM symbol of the neighboring base station.
  • FIG. 11 illustrates a case where the first two OFDM symbols of an uplink subframe overlap with PDCCH transmission OFDM symbols of a neighbor base station.
  • FIG. 12 shows a subframe structure applicable to the situation as shown in FIG. 11.
  • FIG. 13 illustrates a case where the first three OFDM symbols of an uplink subframe overlap with PDCCH transmission OFDM symbols of a neighbor base station.
  • FIG. 14 shows a subframe structure applicable to the situation as shown in FIG. 13.
  • 15 shows an example of changing a reference signal position of a second slot of an uplink subframe.
  • FIG. 16 shows an example of a subframe structure that can be applied when the resource allocation scheme applied to the terminal is a slot hopping scheme.
  • FIG. 17 illustrates a case where the first four OFDM symbols of an uplink subframe overlap with PDCCH transmission OFDM symbols of a neighbor base station.
  • FIG. 18 shows a subframe structure applicable to the situation as shown in FIG. 17.
  • FIG. 19 shows an uplink transmission method of a terminal according to an embodiment of the present invention.
  • 20 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
  • the user equipment may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a personal digital assistant (PDA). It may be called other terms such as digital assistant, wireless modem, handheld device.
  • MS mobile station
  • MT mobile terminal
  • UT user terminal
  • SS subscriber station
  • PDA personal digital assistant
  • a base station generally refers to a fixed station communicating with a terminal, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point an access point
  • the communication from the base station to the terminal is called downlink (DL), and the communication from the terminal to the base station is called uplink (UL).
  • the wireless communication system including the base station and the terminal may be a time division duplex (TDD) system or a frequency division duplex (FDD) system.
  • TDD system is a wireless communication system that performs uplink and downlink transmission and reception using different times in the same frequency band.
  • the FDD system is a wireless communication system capable of transmitting and receiving uplink and downlink simultaneously using different frequency bands.
  • the wireless communication system can perform communication using a radio frame.
  • FIG. 1 shows a structure of a radio frame.
  • a radio frame includes 10 subframes, and one subframe includes two consecutive slots. Slots included in the radio frame are indexed from 0 to 19.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI), and the TTI may be a minimum scheduling unit.
  • TTI transmission time interval
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • FIG. 2 shows a structure of a TDD radio frame.
  • a subframe having an index # 1 and an index # 6 is called a special subframe, and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UPPTS). ).
  • DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the TDD radio frame is a downlink subframe, an uplink subframe, or a special sub for each subframe according to an uplink / downlink configuration (UL / DL configuration) transmitted in an upper layer signal such as an RRC message.
  • UL / DL configuration uplink / downlink configuration
  • FIG 3 shows an example of a resource grid for one downlink slot.
  • the downlink slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and N RB resource blocks (RBs) in the frequency domain.
  • the RB includes one slot in the time domain and a plurality of consecutive subcarriers in the frequency domain in resource allocation units.
  • the number N RB of resource blocks included in the downlink slot depends on the downlink transmission bandwidth N DL configured in the cell. For example, in the LTE system, N RB may be any one of 6 to 110.
  • the structure of the uplink slot may also be the same as that of the downlink slot.
  • Each element on the resource grid is called a resource element (RE).
  • one resource block includes 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain to include 7 ⁇ 12 resource elements, but the number of OFDM symbols and the number of subcarriers in the resource block is exemplarily described. It is not limited to this.
  • the number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like.
  • the number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
  • a downlink (DL) subframe is divided into a control region and a data region in the time domain.
  • the control region includes the first up to four OFDM symbols of 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 physical downlink shared channel (PDSCH) is allocated to the data region.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • control channels such as a physical control format indicator channel (PCFICH), a physical hybrid-ARQ indicator channel (PHICH), and a physical downlink control channel (PDCCH) are transmitted.
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid-ARQ indicator channel
  • PDCCH physical downlink control channel
  • the PCFICH transmitted in the first OFDM symbol of the subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of time of the control region) used for transmission of control channels in the subframe.
  • CFI control format indicator
  • the terminal first receives the CFI on the PCFICH, and then monitors the PDCCH. Unlike 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 an uplink hybrid automatic repeat request (HARQ).
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • HARQ uplink hybrid automatic repeat request
  • An ACK / NACK signal for uplink (UL) data on a physical uplink shared channel (PUSCH) transmitted by a terminal is transmitted on a PHICH.
  • DCI downlink control information
  • PDSCH also called DL grant
  • PUSCH resource allocation also called UL grant
  • VoIP Voice over Internet Protocol
  • 5 shows a structure of an uplink subframe.
  • an uplink subframe is allocated a control region in which a physical uplink control channel (PUCCH) carrying uplink control information is allocated in a frequency domain and a physical uplink shared channel (PUSCH) carrying user data. It can be divided into data areas.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • PUCCH is allocated to an RB pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the first slot and the second slot. RB pairs have the same resource block index m.
  • PUSCH user data and / or uplink control information are transmitted.
  • DL subframe In TDD, a downlink (DL) subframe and an uplink (UL) subframe coexist in one radio frame.
  • Table 1 shows an example of a UL-DL configuration of a radio frame.
  • 'D' represents a DL subframe
  • 'U' represents a UL subframe
  • 'S' represents a special subframe.
  • the terminal may know whether each subframe is a DL subframe or a UL subframe in a radio frame.
  • the UL-DL configuration N (N is any one of 0 to 6) may refer to Table 1 above.
  • the same UL-DL configuration is used in base stations (or cells) constituting one network.
  • base stations configuring the same network may support using different UL-DL settings.
  • a case where a first base station uses a first subframe as a DL subframe and a second base station uses a first subframe as a UL subframe may have a different transmission direction.
  • FIG. 6 illustrates inter-cell interference when different UL-DL configurations are used in adjacent cells.
  • Cells A and B are cells adjacent to each other and use different UL-DL configurations. Assume that a terminal of cell A is a first terminal and a terminal of cell B is a second terminal. Referring to FIG. 6A, the subframe 61 of cell A is set to a DL subframe, and the subframe 62 of cell B is set to a UL subframe. In this case, when the second terminal transmits the uplink signal in the subframe 62 of the cell B, the first terminal receiving the downlink signal in the subframe 61 of the cell A is subjected to interference. That is, cell A is a interfered cell and cell B is an interfering cell.
  • the subframe 63 of the cell A is set to the DL subframe
  • the subframe 64 of the cell B is set to the UL subframe.
  • the downlink signal transmitted in the subframe 63 of the cell A interferes with the uplink signal transmitted in the subframe 64 of the cell B.
  • cell A is an interference cell and cell B is an interference cell.
  • subframe sections 71 and 72 are DL subframes
  • subframe section 73 is UL subframes
  • the subframe periods 71 are DL subframes
  • the subframe periods 72 and 73 are UL subframes.
  • the subframe section 71 performs downlink transmission in the same manner in cell A and cell B.
  • Such a subframe section having the same transmission direction is called a homogeneous subframe. If the transmission direction is the same as downlink transmission, it is called a downlink homogeneous subframe (for example, 71). If the uplink transmission is the same, the uplink homogeneous subframe (for example, 73) is called.
  • Each subframe section 72 has a different transmission direction of each cell.
  • Such a subframe section is called a heterogeneous subframe.
  • the interfering cell performs downlink transmission, but the interfering cell performs downlink heterogeneous subframe, and the interfering cell performs uplink transmission.
  • the interfering cell performs downlink transmission. In this case, it is called an uplink heterogeneous subframe.
  • the first terminal 77 of the cell A is subjected to inter-cell interference (ICI) by the downlink transmission of the second base station 80 of the cell B in the subframe period 71, the cell in the subframe period 72 Inter-cell interference is caused by an uplink signal transmitted by the second terminal 78 of B.
  • cell B is an interference cell and cell A is an interference cell.
  • Downlink transmission for the second terminal 78 belonging to the cell B is performed in the subframe period 71.
  • the downlink transmission for the first terminal 77 belonging to the cell A is also performed in the subframe section 71. Accordingly, inter-cell interference may be assumed as in the existing TDD system.
  • Uplink transmission of the second terminal 78 belonging to the cell B is performed in the subframe periods 72 and 73.
  • uplink transmission of the first terminal 77 belonging to the cell A is performed only in the subframe period 73.
  • the subframe periods 72 and 73 of the cell B are all composed of uplink subframes, interference between cells having different characteristics is caused.
  • the terminal performs power control based on noise and interference (NI). If such interference is changed between cells, power control performance cannot be guaranteed.
  • NI noise and interference
  • interference occurs in homogeneous subframes having the same transmission direction in adjacent cells, but interference occurs in heterogeneous subframes having different transmission directions in adjacent cells.
  • inter-cell interference in heterogeneous subframes is a very important factor for deterioration of data reception performance. This is because, in a heterogeneous subframe, a case in which a specific terminal needs to receive a downlink control signal having a great influence on data reception occurs.
  • One solution for solving the inter-cell interference problem in the heterogeneous subframe is to alleviate the inter-cell interference by performing a proper power control by the terminal transmitting the uplink signal.
  • a specific subframe configured as a downlink subframe for the first terminal and an uplink subframe for the second terminal.
  • the second terminal in the OFDM symbols in which the first terminal receives the downlink control signal, the second terminal can lower the inter-cell interference for the first terminal by transmitting a PUSCH by lowering transmission power or allocating zero power. have.
  • the second terminal transmits the PUSCH / PUCCH at a low transmission power in some OFDM symbols in one subframe and transmits the PUSCH / PUCCH at the original transmission power in the remaining OFDM symbols.
  • changing the transmission power in this continuous time domain may cause discontinuity in the channel phase.
  • the terminal uses a low performance but low cost nonlinear power amplifier.
  • changing the uplink transmission power in a continuous time domain is accompanied by discontinuity in phase.
  • the above solution affects uplink signal transmission of the second terminal. In other words, it is difficult for the base station to properly receive / decode the uplink signal of the second terminal.
  • the present invention proposes a method for transmitting an uplink signal using a new subframe structure in an uplink heterogeneous subframe, and a terminal using the method.
  • an uplink subframe includes two slots including seven OFDM symbols in a normal cyclic prefix (CP).
  • a UE-specific reference signal hereinafter, abbreviated as reference signal
  • the reference signal is a signal previously known to the base station and the terminal. That is, reference signals are transmitted in the fourth and eleventh OFDM symbols of the subframe.
  • the base station may perform channel estimation and data demodulation in units of slots or units of subframes using the reference signal.
  • the first specific number of OFDM symbols (up to four) of the uplink subframe may be reduced in transmission power to mitigate interference on reception of downlink control signals from other terminals. Allocate zero power.
  • a new subframe structure can be used for uplink channel estimation and / or data demodulation.
  • FIG. 10 shows a subframe structure that can be applied when the first OFDM symbol of the uplink subframe overlaps with the PDCCH transmission OFDM symbol of the neighboring base station.
  • the UE allocates a transmission power of the first one OFDM symbol to zero and original transmission in the remaining OFDM symbols. It transmits an uplink signal with power. That is, while using the same uplink subframe structure, the OFDM symbol overlapping the PDCCH region of the neighboring base station is transmitted by muting. This is because, when the overlapping region is one OFDM symbol, it is not easy to insert a separate reference signal in the overlapping region because of SC-FDMA characteristics.
  • FIG. 11 illustrates a case where the first two OFDM symbols of an uplink subframe overlap with PDCCH transmission OFDM symbols of an adjacent base station
  • FIG. 12 illustrates a subframe structure applicable to the situation shown in FIG. 11.
  • first two OFDM symbols of an uplink subframe overlap with an area in which a neighbor base station transmits a PDCCH.
  • a region indicated by 111 of the PUSCH region indicates an area in which subcarriers can be allocated in pairs, such as space time block coding (STBC).
  • STBC space time block coding
  • one reference signal is further allocated to the overlapping area. That is, an additional reference signal 123 is inserted into the first OFDM symbol or the second OFDM symbol of the uplink subframe for channel estimation and data demodulation for the PUSCH.
  • a multi input multi output (MIMO) technique such as frequency selection transmit diversity (FSTD), beamforming, and antenna selection may be used.
  • MIMO multi input multi output
  • FSTD frequency selection transmit diversity
  • antenna selection may be used.
  • subcarriers can be allocated in pairs as in STBC.
  • the BS may perform separate channel estimation and data demodulation using an additional reference signal 123 for the PUSCH overlapping with the PDCCH region of the neighbor BS. In other areas, channel estimation and data demodulation are possible using the existing reference signal 124.
  • FIG. 13 illustrates a case where the first three OFDM symbols of an uplink subframe overlap with PDCCH transmission OFDM symbols of an adjacent base station
  • FIG. 14 illustrates a subframe structure applicable to the situation shown in FIG. 13.
  • the position of the existing reference signal of the first slot in the subframe may be changed without inserting an additional reference signal as shown in FIG. 14 (a) or (b). That is, in the conventional uplink subframe structure, the reference signal of the first slot is located in the fourth OFDM symbol.
  • the position of the reference signal located in the first slot of the uplink subframe corresponds to the PDCCH transmission region of the neighboring base station. It is to move to one OFDM symbol of the three OFDM symbols.
  • channel estimation / data demodulation performance for the fast UE may be somewhat degraded in the remaining regions except for the first three OFDM symbols of the uplink subframe, but the resource allocation efficiency may be maintained without additional reference signal overhead. There is this.
  • 15 shows an example of changing a reference signal position of a second slot of an uplink subframe.
  • the reference signal of the first slot of the uplink subframe is located in one of the OFDM symbols corresponding to the PDCCH region of the neighboring base station, the reference signal of the second slot is replaced by the fourth OFDM symbol of the second slot. Rather, it is located in the first OFDM symbol.
  • the uplink subframe structure illustrated in FIGS. 14 and 15 may be applied when the base station performs channel estimation / data demodulation in units of subframes. If the resource allocation scheme applied to the UE is hopped on a slot basis, it may be difficult to demodulate data in a region that does not overlap the PDCCH transmission region of the neighboring base station in the first slot.
  • FIG. 16 shows an example of a subframe structure that can be applied when the resource allocation scheme applied to the terminal is a slot hopping scheme.
  • reference signals are inserted into third and seventh OFDM symbols in a first slot. That is, in the first slot, one reference signal is inserted in an area overlapping with the PDCCH transmission area of the neighboring base station, and one reference signal is inserted in the remaining area of the first slot to ensure data demodulation and channel estimation performance.
  • FIG. 17 illustrates a case where the first four OFDM symbols of an uplink subframe overlap with PDCCH transmission OFDM symbols of an adjacent base station
  • FIG. 18 illustrates a subframe structure applicable to the situation shown in FIG. 17.
  • the number of OFDM symbols constituting the PDCCH transmission region of a neighboring base station is the same as the maximum number of OFDM symbols allocated for transmitting the PDCCH by N (N is a natural number of 1 or more). Or can be many.
  • N is a natural number of 1 or more.
  • any MIMO transmission diversity scheme may be used in addition to STBC in OFDM symbols except for an OFDM symbol to which a reference signal is allocated.
  • FIG. 19 shows an uplink transmission method of a terminal according to an embodiment of the present invention.
  • the base station transmits uplink subframe type information to the terminal (S110).
  • the uplink subframe type information may be information indicating which subframe structure to use among the subframe structures described with reference to FIGS. 9 to 18.
  • the plurality of subframe structures may be subframe structures having different reference signal positions.
  • the uplink subframe type information may be included in the UL grant and transmitted or may be transmitted through an upper layer signal such as an RRC message.
  • uplink subframe type information for a plurality of uplink subframes may be delivered by one-time RRC message information transmission. For example, the base station may inform what type of subframe structure to use for a plurality of subframes in a bitmap format.
  • the base station may transmit the uplink subframe type information when the transmission power of the terminal needs to be changed in one subframe, such as a case where a heterogeneous uplink subframe is generated due to different UL / DL configuration from neighboring base stations.
  • the UE After configuring the uplink subframe according to the uplink subframe type information (S120), the UE transmits an uplink signal according to the configured uplink subframe structure (S130).
  • the interference on the downlink control signal transmission of the neighboring base station can be alleviated, and the uplink signal transmission of the terminal can be reliably.
  • 20 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
  • the base station 100 includes a processor 110, a memory 120, and an RF unit 130.
  • the processor 110 implements the proposed functions, processes and / or methods.
  • the processor 110 may transmit uplink subframe type information to the terminal through a physical layer signal such as a UL grant or a higher layer signal such as an RRC message.
  • the PUSCH according to the subframe structure indicated by the uplink subframe type information may be received and decoded from the UE.
  • the memory 120 is connected to the processor 110 and stores various information for driving the processor 110.
  • the RF unit 130 is connected to the processor 110 and transmits and / or receives a radio signal.
  • the terminal 200 includes a processor 210, a memory 220, and an RF unit 230.
  • the processor 210 implements the proposed functions, processes and / or methods. For example, the processor 210 receives uplink subframe type information from a base station and configures an uplink subframe having one of a plurality of predetermined subframe structures according to the uplink subframe type information. .
  • the subframe structure has been described with reference to FIGS. 9 to 18.
  • the processor 210 transmits an uplink signal to the base station in the configured uplink subframe.
  • the uplink subframe is a downlink subframe in which a downlink control signal is transmitted from an adjacent base station and a subframe overlapping in a time domain. It may be a subframe to be transmitted.
  • the memory 220 is connected to the processor 210 and stores various information for driving the processor 210.
  • the RF unit 230 is connected to the processor 210 to transmit and / or receive a radio signal.
  • Processors 110 and 210 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
  • the memory 120, 220 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
  • the RF unit 130 and 230 may include one or more antennas for transmitting and / or receiving 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 the memories 120 and 220 and executed by the processors 110 and 210.
  • the memories 120 and 220 may be inside or outside the processors 110 and 210, and may be connected to the processors 110 and 210 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)
  • Time-Division Multiplex Systems (AREA)

Abstract

La présente invention a trait à un procédé et à un appareil permettant d'émettre un signal de liaison montante au moyen d'un terminal. Le procédé comprend : une étape consistant à recevoir des informations de type secteur de trame de liaison montante provenant d'une première station de base ; une étape consistant à configurer un secteur de trame de liaison montante qui est doté d'une des multiples structures de secteur de trame prédéterminées en fonction des informations de type secteur de trame de liaison montante ; et une étape consistant à émettre un signal de liaison montante à partir du secteur de trame de liaison montante ainsi configuré jusqu'à la première station de base. Le secteur de trame de liaison montante est un secteur de trame qui se chevauche, dans un domaine temporel, avec un secteur de trame de liaison descendante afin d'émettre un signal de commande de liaison descendante à partir d'une seconde station de base qui est adjacente à la première station de base. Les multiples structures de secteur de trame sont chacune dotées de différents emplacements de signal de référence.
PCT/KR2012/004515 2011-06-08 2012-06-08 Procédé et appareil permettant d'émettre un signal de liaison montante dans un système de télécommunication sans fil basé sur le duplexage par répartition dans le temps WO2012169815A2 (fr)

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US61/494,421 2011-06-08

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JP2019068449A (ja) * 2013-08-16 2019-04-25 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ 無認可スペクトルを用いたｌｔｅ（登録商標）／ｌｔｅ−ａ通信システムのためのダウンリンクプロシージャ
WO2019153170A1 (fr) * 2018-02-08 2019-08-15 Oppo广东移动通信有限公司 Procédé de transmission d'informations, procédé de réception d'informations, dispositif terminal, et dispositif de réseau
US11375525B2 (en) 2018-02-08 2022-06-28 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for transmitting information, method for receiving information, terminal device, and network device

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JP2014520449A (ja) 2014-08-21
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