WO2014112835A1 - Procédé d'émission de signal en liaison montante dans un système de communications sans fil et appareil associé - Google Patents

Procédé d'émission de signal en liaison montante dans un système de communications sans fil et appareil associé Download PDF

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Publication number
WO2014112835A1
WO2014112835A1 PCT/KR2014/000531 KR2014000531W WO2014112835A1 WO 2014112835 A1 WO2014112835 A1 WO 2014112835A1 KR 2014000531 W KR2014000531 W KR 2014000531W WO 2014112835 A1 WO2014112835 A1 WO 2014112835A1
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Prior art keywords
resource
reference signal
resource block
data
ofdm
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PCT/KR2014/000531
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English (en)
Korean (ko)
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서동연
김봉회
안준기
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information
    • 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

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting an uplink signal in a wireless communication system.
  • 3rd Generation Partnership Project (3GPP) long term evolution-advanced uses orthogonal frequency division multiplexing (OFDM) for downlink and single carrier-frequency division for uplink. multiplexing).
  • SC-FDM is a method of performing a discrete Fourier transform (DFT) in front of an inverse Fourier fast transform (IFFT) of OFDM.
  • DFT discrete Fourier transform
  • IFFT inverse Fourier fast transform
  • the uplink signal transmission of the SC-FDM scheme has the advantage of improving the peak to average power ratio (PAPR) characteristics of the transmitter under limited power conditions and reducing the cost of a radio frequency (RF) module.
  • PAPR peak to average power ratio
  • RF radio frequency
  • the SC-FDM scheme increases the complexity of the channel estimation and decoding modules of the receiver and degrades the performance of OFDM.
  • a small cell is a small base station connected to a conventional macro base station by a wired / wireless base station and has a smaller coverage than the macro base station.
  • Placing a large number of small cells increases the probability that the transmitter is located in the small cell.
  • the transmitter can communicate with the small cell much closer than the macro base station, thereby increasing the probability of operating in a range in which there is a margin in transmission power.
  • a method and apparatus for transmitting an uplink signal in a wireless communication system are provided.
  • a method for transmitting an uplink signal of a terminal in a wireless communication system allocates M resource blocks for uplink signal transmission, and transmits data and reference signals in the allocated M resource blocks, wherein the reference signal includes N resource blocks (RBs). Characterized in that the unit is mapped. Where M and N are natural numbers and M> N.
  • 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 allocates M resource blocks for uplink signal transmission, and transmits data and reference signals in the allocated M resource blocks, wherein the reference signal Is mapped to units of N resource blocks (RBs).
  • RF radio frequency
  • RBs resource blocks
  • mapping data and resource elements in a reference signal structure, a control channel, and a data channel of the present invention efficient use of resources is possible when OFDM is used for uplink transmission.
  • FIG. 1 shows a structure of a radio frame.
  • FIG. 2 shows an example of a resource grid for one downlink slot.
  • 3 shows a downlink subframe.
  • FIG. 5 shows a channel structure of PUCCH format 2 / 2a / 2b for one slot in a normal CP.
  • FIG. 8 is a comparative example of a conventional single carrier system and a carrier aggregation system.
  • FIG 9 illustrates a process of generating an SC-FDM signal or an OFDM signal.
  • FIG 10 shows an uplink signal transmission method according to an embodiment of the present invention.
  • FIG. 11 shows an example of applying the method of FIG. 10.
  • FIG. 12 illustrates a method of allocating a reference signal when OFDMA is applied to uplink signal transmission.
  • FIG. 13 illustrates a frequency priority mapping scheme and a slot priority mapping scheme.
  • mapping data to resource elements when slot hopping is used for PUSCH transmission shows examples of mapping data to resource elements when slot hopping is used for PUSCH transmission.
  • FIG. 15 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
  • 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
  • FIG. 1 shows a structure of a radio frame.
  • the radio frame includes 10 subframes indexed from 0 to 9.
  • One subframe includes two consecutive slots.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • the length of one subframe may be, for example, 1 ms, and the length of one slot may be 0.5 ms.
  • Radio frames can be used for uplink and downlink.
  • Uplink means transmission from the terminal to the base station
  • downlink means transmission from the base station to the terminal.
  • a subframe used for uplink is called an uplink subframe and a subframe used for downlink is called a downlink subframe.
  • Slots included in the uplink subframe are called uplink slots, and slots included in the downlink subframe are called downlink slots.
  • FIG. 2 shows an example of a resource grid for one downlink slot.
  • the downlink slot includes a plurality of OFDM symbols in the time domain and includes 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 a downlink transmission bandwidth set in a cell. For example, in the LTE system, N RB may be any one of 6 to 110.
  • the OFDM symbol represents a time unit.
  • Each element on the resource grid is called a resource element (RE).
  • one resource block is composed of 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 It is not limited to this.
  • one slot may include 7 OFDM symbols
  • one slot may include 6 OFDM symbols.
  • the number of OFDM symbols and the number of subcarriers may include the length of the CP and the frequency spacing ( 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.
  • the structure of the uplink slot may also be the same as that of the downlink slot.
  • SC-FDMA single carrier-frequency division multiple access
  • OFDM symbols may be used for both downlink and uplink.
  • 3 shows a downlink subframe.
  • a downlink (DL) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to four 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 control channels in 3GPP LTE / LTE-A include a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid-ARQ indicator channel (PHICH). .
  • PDCCH physical downlink control channel
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid-ARQ indicator 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 an uplink (UL) hybrid automatic repeat request (HARQ) process.
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • HARQ 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
  • DCI downlink control information
  • PDSCH also called DL grant
  • PUSCH resource allocation also called UL grant
  • VoIP Voice over Internet Protocol
  • transmission of a DL transport block is performed by a pair of PDCCH and PDSCH.
  • Transmission of the UL transport block is performed by a pair of PDCCH and PUSCH.
  • the wireless device receives a DL transport block on a PDSCH indicated by the PDCCH.
  • the wireless device monitors the PDCCH in the DL subframe and receives the DL resource allocation on the PDCCH.
  • the wireless device receives the DL transport block on the PDSCH indicated by the DL resource allocation.
  • the base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches a cyclic redundancy check (CRC) to the DCI, and identifies a unique identifier according to the owner or purpose of the PDCCH (this is called a Radio Network Temporary Identifier (RNTI)). ) To the CRC.
  • CRC cyclic redundancy check
  • a unique identifier of the wireless device for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • a paging indication identifier for example, P-RNTI (P-RNTI)
  • P-RNTI P-RNTI
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • the TPC-RNTI may be masked to the CRC to indicate a transmit power control (TPC) command for the plurality of wireless devices.
  • TPC transmit power control
  • the SPS-C-RNTI may be masked to the CRC.
  • the PDCCH carries control information for the corresponding specific wireless device (called UE-specific control information), and if another RNTI is used, the PDCCH is received by all or a plurality of wireless devices in the cell. Carries common control information.
  • the DCI to which the CRC is added is encoded to generate coded data.
  • Encoding includes channel encoding and rate matching.
  • the coded data is modulated to generate modulation symbols. Modulation symbols are mapped to physical resource elements (REs).
  • REs physical resource elements
  • the control region in the subframe includes a plurality of control channel elements (CCEs).
  • the CCE is a logical allocation unit used to provide a coding rate according to the state of a radio channel to a PDCCH and corresponds to a plurality of resource element groups (REGs).
  • the REG includes a plurality of resource elements.
  • 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.
  • One REG includes four REs and one CCE includes nine REGs.
  • ⁇ 1, 2, 4, 8 ⁇ CCEs may be used to configure one PDCCH, and each element of ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
  • the number of CCEs used for transmission of the PDDCH is determined by the base station according to the channel state. For example, for a wireless device having a good downlink channel state, one CCE may be used for PDCCH transmission. Eight CCEs may be used for PDCCH transmission for a wireless device having a poor downlink channel state.
  • a control channel composed of one or more CCEs performs interleaving in units of REGs and is mapped to physical resources after a cyclic shift based on a cell ID.
  • 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).
  • the UE may simultaneously transmit the PUCCH and the PUSCH, or may transmit only one of the PUCCH and the PUSCH.
  • 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.
  • HARQ Hybrid Automatic Repeat reQuest
  • ACK Non-acknowledgement
  • NACK Non-acknowledgement
  • channel status information indicating the downlink channel status, for example, channel quality indicator (CQI), precoding matrix on the PUCCH
  • CQI channel quality indicator
  • PTI precoding matrix on the PUCCH
  • RI rank indication
  • the CQI provides information on link adaptive parameters that the terminal can support for a given time.
  • the CQI may indicate a data rate that can be supported by the downlink channel in consideration of characteristics of the terminal receiver and signal to interference plus noise ratio (SINR).
  • the base station may determine the modulation (QPSK, 16-QAM, 64-QAM, etc.) and coding rate to be applied to the downlink channel using the CQI.
  • CQI can be generated in several ways. For example, a method of quantizing and feeding back a channel state as it is, a method of calculating a feedback to a signal to interference plus noise ratio (SINR), and a method of notifying a state that is actually applied to a channel such as a modulation coding scheme (MCS) may be used.
  • MCS modulation coding scheme
  • the MCS includes a modulation scheme, a coding scheme, a coding rate, and the like.
  • PMI provides information about the precoding matrix in the codebook based precoding.
  • PMI is associated with multiple input multiple output (MIMO).
  • MIMO multiple input multiple output
  • Feedback of PMI in MIMO is called closed loop MIMO (closed loop MIMO).
  • the RI is information about a rank (ie, number of layers) recommended by the UE. That is, RI represents the number of independent streams used for spatial multiplexing.
  • the RI is fed back only when the terminal operates in the MIMO mode using spatial multiplexing.
  • RI is always associated with one or more CQI feedback. In other words, the fed back CQI is calculated assuming a specific RI value. Since the rank of the channel generally changes slower than the CQI, the RI is fed back fewer times than the CQI.
  • the transmission period of the RI may be a multiple of the CQI / PMI transmission period. RI is given for the entire system band and frequency selective RI feedback is not supported.
  • PUCCH carries various kinds of control information according to a format.
  • PUCCH format 1 carries a scheduling request (SR). In this case, an OOK (On-Off Keying) method may be applied.
  • PUCCH format 1a carries ACK / NACK (Acknowledgement / Non-Acknowledgement) modulated by a Binary Phase Shift Keying (BPSK) scheme for one codeword.
  • PUCCH format 1b carries ACK / NACK modulated by Quadrature Phase Shift Keying (QPSK) for two codewords.
  • PUCCH format 2 carries a channel quality indicator (CQI) modulated in a QPSK scheme.
  • PUCCH formats 2a and 2b carry CQI and ACK / NACK.
  • the PUCCH format may be classified according to a modulation scheme and the number of bits in a subframe.
  • Table 1 shows a modulation scheme according to the PUCCH format and the number of bits in a subframe.
  • All PUCCH formats use a cyclic shift (CS) of a sequence in each OFDM symbol.
  • the cyclically shifted sequence is generated by cyclically shifting a base sequence by a specific cyclic shift amount.
  • the specific CS amount is indicated by the cyclic shift index (CS index).
  • n is the element index
  • N is the length of the base sequence.
  • b (n) is defined in section 5.5 of 3GPP TS 36.211 V8.7.0.
  • the length of the sequence is equal to the number of elements included in the sequence. u may be determined by a cell identifier (ID), a slot number in a radio frame, or the like.
  • ID cell identifier
  • the length N of the base sequence is 12 since one resource block includes 12 subcarriers. Different base sequences define different base sequences.
  • the cyclically shifted sequence r (n, I cs ) may be generated by cyclically shifting the base sequence r (n) as shown in Equation 2 below.
  • I cs is a cyclic shift index indicating the CS amount (0 ⁇ I cs ⁇ N-1).
  • the available cyclic shift index of the base sequence refers to a cyclic shift index derived from the base sequence according to the CS interval. For example, if the length of the base sequence is 12 and the CS interval is 1, the total number of available cyclic shift indices of the base sequence is 12. Alternatively, if the length of the base sequence is 12 and the CS interval is 2, the total number of available cyclic shift indices of the base sequence is six.
  • PUCCH 5 shows a channel structure of PUCCH format 2 / 2a / 2b for one slot in a normal CP. As described above, the PUCCH format 2 / 2a / 2b is used for transmission of CQI.
  • SC-FDMA symbols 1 and 5 in a normal CP are used for a DM RS (demodulation reference signal) which is an uplink reference signal.
  • DM RS demodulation reference signal
  • SC-FDMA single carrier-freuquency division multple access
  • Ten CQI information bits are channel coded, for example, at a rate of 1/2, resulting in 20 coded bits.
  • Reed-Muller (RM) codes may be used for channel coding.
  • scrambling similar to PUSCH data being scrambled into a gold sequence of length 31
  • QPSK constellation mapping to generate QPSK modulation symbols (d 0 to d 4 in slot 0).
  • Each QPSK modulation symbol is modulated with a cyclic shift of a basic RS sequence of length 12 and OFDM modulated, and then transmitted in each of 10 SC-FDMA symbols in a subframe. 12 uniformly spaced cyclic shifts allow 12 different terminals to be orthogonally multiplexed in the same PUCCH resource block.
  • a basic RS sequence of length 12 may be used as a DM RS sequence applied to SC-FDMA symbols 1 and 5
  • w 0 , w 1 , w 2, and w 3 may be modulated in the time domain after Inverse Fast Fourier Transform (IFFT) modulation or in the frequency domain before IFFT modulation.
  • IFFT Inverse Fast Fourier Transform
  • One slot includes seven OFDM symbols, three OFDM symbols become RS (Reference Signal) OFDM symbols for reference signals, and four OFDM symbols become data OFDM symbols for ACK / NACK signals.
  • RS Reference Signal
  • modulation symbol d (0) is generated by modulating an encoded 2-bit ACK / NACK signal with Quadrature Phase Shift Keying (QPSK).
  • QPSK Quadrature Phase Shift Keying
  • the cyclic shift index I cs may vary depending on the slot number n s in the radio frame and / or the symbol index l in the slot.
  • the modulation symbol d (0) is spread to the cyclically shifted sequence r (n, I cs ).
  • r n, I cs .
  • the one-dimensional spread sequence may be spread using an orthogonal sequence.
  • An orthogonal sequence w i (k) (i is a sequence index, 0 ⁇ k ⁇ K ⁇ 1) having a spreading factor K 4 uses the following sequence.
  • Different spreading coefficients may be used for each slot.
  • the two-dimensional spreading sequence ⁇ s (0), s (1), s (2), s (3) ⁇ can be expressed as follows.
  • Two-dimensional spread sequences ⁇ s (0), s (1), s (2), s (3) ⁇ are transmitted in the corresponding OFDM symbol after IFFT is performed.
  • the ACK / NACK signal is transmitted on the PUCCH.
  • the reference signal of the PUCCH format 1b is also transmitted by cyclically shifting the base sequence r (n) and spreading it in an orthogonal sequence.
  • the cyclic shift indexes corresponding to three RS OFDM symbols are I cs4 , I cs5 and I cs6 , three cyclically shifted sequences r (n, I cs4 ), r (n, I cs5 ), r (n, I cs6 ).
  • the orthogonal sequence index i, the cyclic shift index I cs, and the resource block index m are parameters necessary for configuring the PUCCH and resources used to distinguish the PUCCH (or terminal). If the number of available cyclic shifts is 12 and the number of available orthogonal sequence indexes is 3, PUCCHs for a total of 36 terminals may be multiplexed into one resource block.
  • PUCCH format 3 is introduced in LTE-A.
  • PUCCH format 3 uses QPSK as a modulation scheme, and the number of bits that can be transmitted in a subframe is 48 bits.
  • PUCCH format 3 performs block spreading based transmission. That is, a modulation symbol sequence obtained by modulating a multi-bit ACK / NACK using a block spreading code is spread in a time domain and then transmitted.
  • the modulation symbol sequence ⁇ d1, d2, ... ⁇ is spread in the time domain by applying a block spreading code.
  • the block spreading code may be an orthogonal cover code (OCC).
  • OOCC orthogonal cover code
  • multi-bit ACK / NACK information bits are channel coded (using RM code, TBCC, punctured RM code, etc.) to generate ACK / NACK coded bits, and the ACK / NACK coded bits It may be a sequence of modulated (eg, QPSK) modulated symbols.
  • the sequence of modulation symbols is transmitted after being mapped to data symbols of a slot through a fast Fourier transform (FFT) and an inverse fast Fourier transform (IFFT).
  • FFT fast Fourier transform
  • IFFT inverse fast Fourier transform
  • FIG. 7 illustrates a case in which three RS symbols exist in one slot, two RS symbols may exist and in this case, a block spreading code having a length of 5 may be used.
  • FIG. 8 is a comparative example of a conventional single carrier system and a carrier aggregation system.
  • CC component carrier
  • the carrier aggregation system may be divided into a continuous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which carriers aggregated 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 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 system frequency band of a wireless communication system is divided into a plurality of carrier frequencies.
  • the carrier frequency means a center frequency of a cell.
  • a cell may mean a downlink frequency resource and an uplink frequency resource.
  • the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
  • CA carrier aggregation
  • the cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • the primary cell refers to a cell operating at a primary frequency, and is a cell in which the terminal performs an initial connection establishment procedure or connection reestablishment with the 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 serving cell is configured as a primary cell when the carrier aggregation is not set or the terminal cannot provide carrier aggregation.
  • the term serving cell indicates a cell configured for the terminal and may be configured in plural.
  • One serving cell may be configured with one downlink component carrier or a pair of ⁇ downlink component carrier, uplink component carrier ⁇ .
  • the plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.
  • a primary component carrier refers to a component carrier (CC) corresponding to a primary cell.
  • the PCC is a CC in which the terminal initially makes a connection (connection or RRC connection) with the base station among several CCs.
  • the PCC is a special CC that manages a connection (Connection or RRC Connection) for signaling regarding a plurality of CCs and manages UE context, which is connection information related to a terminal.
  • the PCC is connected to the terminal and always exists in the active state in the RRC connected mode.
  • the downlink component carrier corresponding to the primary cell is called a downlink primary component carrier (DL PCC), and the uplink component carrier corresponding to the primary cell is called an uplink major component carrier (UL PCC).
  • DL PCC downlink primary component carrier
  • U PCC uplink major component carrier
  • Secondary component carrier refers to a CC corresponding to the secondary cell. That is, the SCC is a CC allocated to the terminal other than the PCC, and the SCC is an extended carrier for the additional resource allocation other than the PCC and may be divided into an activated or deactivated state.
  • the downlink component carrier corresponding to the secondary cell is referred to as a DL secondary CC (DL SCC), and the uplink component carrier corresponding to the secondary cell is referred to as an uplink secondary component carrier (UL SCC).
  • DL SCC DL secondary CC
  • UL SCC uplink secondary component carrier
  • the downlink component carrier may configure one serving cell, and the downlink component carrier and the uplink component carrier may be connected to configure one serving cell.
  • the serving cell is not configured with only one uplink component carrier.
  • the activation / deactivation of the component carrier is equivalent to the concept of activation / deactivation of the serving cell.
  • activation of serving cell 1 means activation of DL CC1.
  • serving cell 2 assumes that DL CC2 and UL CC2 are configured to be configured, activation of serving cell 2 means activation of DL CC2 and UL CC2.
  • each component carrier may correspond to a serving cell.
  • a plurality of component carriers (CCs), that is, a plurality of serving cells may be supported.
  • FIG 9 illustrates a process of generating an SC-FDM signal or an OFDM signal.
  • a block includes N data symbols modulated by quadrature amplitude modulation (QAM).
  • the N data symbols are converted 101 from serial to parallel.
  • An N-point discrete Fourier transform (DFT) is performed on N data symbols converted in parallel (102). Zeros are added to the output of the N-point DFT so that a total of M output values are mapped to M subcarriers (103). Since M> N, (M-N) zeros are added.
  • the M subcarriers are transformed in series via an M-point inverse discrete Fourier transform (IDFT) (104) and added with a cyclic prefix (CP) (105).
  • IDFT M-point inverse discrete Fourier transform
  • CP cyclic prefix
  • This uplink channel structure can reduce the cost of the RF unit of the terminal by improving the PAPR characteristics of the terminal reaching the power limit.
  • the SC-FDM scheme has a problem of increasing complexity and performance degradation in channel estimation and decoding of a receiver, compared to OFDM.
  • the OFDM scheme may be referred to as excluding the N-point DFT in the SC-FDM scheme.
  • MTC machine type communication
  • MU-MIMO multi user-multi input multi output
  • aggregation between TDD cells using different UL-DL configurations and between cells using different frame structures
  • the system can be configured in a variety of ways, including aggregation, introduction of small cells.
  • a terminal located in the small cell may perform uplink transmission to the small cell in a margin within a power limit or less. It is considered to use OFDM without DFT precoding in uplink transmission to small cells.
  • orthogonal frequency division multiple access may be used for uplink instead of single carrier-frequency division multiple access (SC-FDMA).
  • SC-FDMA means a multiple access scheme using SC-FDM
  • OFDMA means a multiple access scheme using OFDM.
  • the UE may use the OFDMA method instead of the SC-FDMA method when transmitting the PUSCH.
  • it may be inefficient to use a structure of a reference signal, a method of mapping data to RE in PUCCH, PUSCH, and the like, which is determined based on the conventional SC-FDMA scheme. That is, there is a need for a structure of a reference signal on the assumption that OFDM is used for uplink, a method of mapping data to an RE in PUCCH, and PUSCH.
  • the reference signal is a signal known to the transmitter and the receiver in advance and is a signal used for channel estimation for data demodulation or channel estimation for scheduling.
  • the reference signal uses a sequence known to the transmitter and the receiver in advance.
  • a ZC (Zadoff-Chu) sequence is used as a reference signal, wherein the length of the ZC sequence is a resource element in the frequency axis of the allocated resource blocks (RBs).
  • a base sequence is selected in consideration of interference between neighboring cells, and the reference signals transmitted to various terminals should be distinguished.
  • OFDMA orthogonal frequency division multiple access
  • LTE-A clustered RB allocation has been introduced to alleviate application of a single carrier characteristic in uplink transmission.
  • contiguous resource blocks have been allocated for PUSCH transmission.
  • not all resource blocks allocated for PUSCH are contiguous, but two contiguous bundles are allocated, each bundle being contiguous resource blocks. It can be configured as.
  • the length of the reference signal sequence was determined according to the total number of allocated resource blocks, and the reference signal sequence was divided and applied to each bundle. For example, suppose a first bundle and a second bundle are allocated for a PUSCH. Assume that the first bundle consists of two consecutive resource blocks, the second bundle consists of four consecutive resource blocks, and the first and second bundles are spaced apart from each other.
  • a total of six resource blocks are allocated to the PUSCH.
  • the first bundle has 24 resource elements on the frequency axis
  • the second bundle has 48 resource elements on the frequency axis.
  • a sequence of length 72 was generated as a reference signal sequence, and then a sequence of length 24 was extracted (for example, cut out) from the sequence of length 72 and applied as a reference signal for the first bundle.
  • the sequence of length 48 is extracted from the sequence of length 72 and applied as a reference signal for the second bundle.
  • a first terminal is allocated both a first bundle and a second bundle
  • a second terminal is allocated only a second bundle for PUSCH transmission.
  • the first terminal cuts the sequence of length 48 from the sequence of length 72 and uses it as the reference signal for the second bundle
  • the second terminal uses the sequence of length 48 as the reference signal for the second bundle. Done.
  • the "sequence 48 length cut out from the sequence length 72" used by the first terminal and the "sequence length 48" used by the second terminal are not guaranteed to be orthogonal.
  • FIG 10 shows an uplink signal transmission method according to an embodiment of the present invention.
  • the terminal allocates M resource blocks for uplink signal transmission (S110).
  • the terminal may receive a scheduling signal (UL grant) from a base station and allocate the M resource blocks based on the scheduling signal.
  • the M resource blocks may be resources for a PUSCH.
  • the terminal transmits data and reference signals in the allocated M resource blocks (S120).
  • the reference signal may be mapped in units of N resource blocks.
  • M and N are natural numbers and M> N.
  • the N value may be a value indicated through a higher layer signal or a predetermined value according to the system band or the M value.
  • the sequence configuring the reference signal may consist of one or more unit sequences.
  • the N resource blocks be unit blocks. If the length of the unit block is greater than the length of the unit sequence, a plurality of unit sequences are connected according to the size of the unit block to form and transmit a reference signal sequence.If the length of the unit block is smaller than the unit sequence length, Only part of it can configure and transmit a reference signal.
  • the length of the unit block means how many subcarriers (or resource elements) are included in the frequency axis for one OFDM symbol included in the unit block.
  • FIG. 11 shows an example of applying the method of FIG. 10.
  • a first resource block bundle 111 and a second resource block bundle 112 may be allocated to a UE for PUSCH transmission.
  • the first resource block bundle 111 may include two resource blocks on the frequency axis
  • the length of the reference signal sequence is 24. That is, the number of resource elements located in one OFDM symbol of two resource blocks is 24.
  • This reference signal sequence is referred to as a unit sequence for convenience.
  • RS # 1 which is a reference signal transmitted from the first resource block bundle 111, uses one unit sequence
  • RS # 2 which is a reference signal transmitted from the second resource block bundle 112 indicates that the unit sequence is Two are used. If the terminal transmits a reference signal over the system band (eg, 100 RB), 50 unit sequences will be used.
  • the UE may use a reference signal sequence having a length of 24 in the first resource block bundle 111 and use a reference signal sequence having a length of 48 in the second resource block bundle 112.
  • a reference signal sequence having a specific length is cut out and used according to the number of resource elements included in each resource block bundle in a reference signal sequence having a length of 72.
  • the resource element included in each resource block bundle is used.
  • Each reference signal sequence having the same length as the number of n is used.
  • a reference signal is transmitted through all resource elements included in a specific OFDM symbol within a PUSCH band allocated by the UE. This is to reduce the PAPR. This approach may result in unnecessarily allocating / transmitting a reference signal in a good channel environment.
  • FIG. 12 illustrates a method of allocating a reference signal when OFDMA is applied to uplink signal transmission.
  • a reference signal may be transmitted in one OFDM symbol for each slot.
  • the reference signal may be mapped in units of N (eg, 1) resource blocks and may be allocated / transmitted only to some of the six resource blocks. That is, the reference signal may be transmitted in the form of a comb in the band to which the PUSCH is allocated.
  • reference signals are transmitted to 0, 2, and 4 resource blocks, and data is mapped to 1, 3, and 5 resource blocks. Can be.
  • the rate at which the reference signal and data are mapped in the resource blocks allocated for PUSCH transmission may be determined as a function of a transport block size (TBS), a modulation method of data, and a resource block. If the channel condition is good, the coding rate may be high. In this case, the ratio of the reference signal may be lowered.
  • TBS transport block size
  • QAM modulation method of data
  • the data may not be mapped to the OFDM symbol to which the reference signal is transmitted.
  • QPSK and BPSK are used as the data modulation scheme, as shown in FIG. 12, data may be mapped to an OFDM symbol to which a reference signal is transmitted at a predetermined ratio.
  • the configuration of the reference signal is obtained by counting the number of resource elements for transmitting the reference signal according to the ratio of reference signal: data in the allocated PUSCH and counting the number of corresponding resource elements.
  • the reference signal sequence used in SC-FDMA can be selected and transmitted in the form of comb.
  • PUCCH format 1 / 1a PUCCH format 1 / 1a
  • PUCCH format 2 / 2a / 2b PUCCH format 3, and the like are used.
  • control information is transmitted by applying QPSK modulation to the same sequence as the reference signal. Accordingly, multiplexing of PUCCHs of different terminals in the same resource block is performed by a cyclic shift (CS) of a basic sequence or an orthogonal cover code (OCC) in a time domain. Even when the PUSCH is transmitted in the OFDM scheme, it is preferable that the PUCCH maintain the existing structure.
  • CS cyclic shift
  • OCC orthogonal cover code
  • control information mapping is mapped to each RE of the PUCCH and IFFT is transmitted after DFT spreading, and multiplexing of PUCCHs of different terminals is performed by an orthogonal cover code of a time domain. Therefore, when the PUSCH is transmitted in the OFDM scheme, it is efficient to transmit the portion in which data is transmitted in the PUCCH format 3 by the OFDM scheme while maintaining the time domain OCC but not applying the DFT spreading.
  • SFBC space frequency block coding
  • the coded bits mapped to the SC-FDMA symbol by DFT spreading are distributed and transmitted over the frequency band allocated to the PUSCH. Therefore, in order to obtain diversity of the time domain, the data is mapped to the time axis first when mapping data elements. On the other hand, in the case of OFDM where DFT spreading is not applied, mapping for diversity in the frequency axis is required.
  • FIG. 13 illustrates a frequency priority mapping scheme and a slot priority mapping scheme.
  • numbers included in respective resource elements illustrate a mapping order.
  • Codeblock 0 (CB 0) is first mapped onto a frequency axis to resource elements included in the first OFDM symbol of slot 0, and then the next OFDM. It is mapped to the resource elements contained in the symbol.
  • the code block CB 1 is first mapped on the frequency axis to the resource elements included in the first OFDM symbol of slot 1 and then mapped to the resource elements included in the second OFDM symbol.
  • code block 0 is mapped in order of resource element of slot 0, resource element of slot 1, resource element of slot 0, and resource element of slot 1.
  • Code block 1 is also mapped in order of a resource element of slot 0, a resource element of slot 1, a resource element of slot 0, and a resource element of slot 1.
  • slot hopping when transmitting the PUSCH, conventionally transmitted in successive resource blocks, slot hopping may be used.
  • slot hopping a resource block of a first slot and a resource block of a second slot in which a PUSCH is transmitted are transmitted spaced apart from each other on a frequency axis. Therefore, in order to effectively utilize frequency diversity, it is efficient to use slot-first mapping. That is, the order of mapping data to resource elements is in the order of slot, frequency, and time.
  • mapping data to resource elements when slot hopping is used for PUSCH transmission shows examples of mapping data to resource elements when slot hopping is used for PUSCH transmission.
  • codeword 0 is mapped to one resource block of two slot-hopped resource blocks 141 and 142, and codeword 1 is mapped to the remaining resource blocks.
  • a frequency-first mapping method is used in each resource block.
  • the codewords 0 and 1 are mapped to the slot-hopped two resource blocks 143 and 144 in a slot-first mapping manner. In this case, since codewords 0 and 1 are mapped to both resource blocks located in different frequency bands, frequency diversity due to slot hopping occurs.
  • FIG. 15 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
  • 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 a UL grant to the terminal and receive data and a reference signal from the terminal through resources scheduled by the UL grant.
  • the reference signal may be mapped in units of N resource blocks among M resource blocks allocated for uplink transmission (M> N).
  • the OFDM scheme may be used for uplink transmission and the processor 110 may apply data and reference signal reception / decoding according to the OFDM scheme.
  • 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 allocates M resource blocks for uplink signal transmission, and transmits data and reference signals in the allocated M resource blocks. In this case, the reference signal may be mapped in units of N resource blocks (M> N). This reference signal mapping can be used when the OFDM scheme is applied unlike the conventional SC-FDM scheme for uplink transmission.
  • 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)

Abstract

L'invention concerne un procédé destiné à permettre à un terminal d'émettre un signal en liaison montante dans un système de communications sans fil et un terminal utilisant ledit procédé. Le procédé comprend les étapes consistant à affecter M blocs de ressources servant à émettre un signal en liaison montante, et à émettre des données et un signal de référence à partir des M blocs de ressources affectés, caractérisé en ce que le signal de référence est transcrit dans une unité de N blocs de ressources (RB), M et N étant des entiers naturels et M > N. Le procédé peut être appliqué lorsqu'un MROF (multiplexage par répartition orthogonale en fréquence) est utilisé pour l'émission en liaison montante.
PCT/KR2014/000531 2013-01-17 2014-01-17 Procédé d'émission de signal en liaison montante dans un système de communications sans fil et appareil associé WO2014112835A1 (fr)

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CN114826526A (zh) * 2015-12-18 2022-07-29 弗劳恩霍夫应用研究促进协会 无线通信系统中具有缩短的端到端延时的数据信号传输
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CN110831182A (zh) * 2018-08-10 2020-02-21 华为技术有限公司 一种资源分配方法、相关设备及装置
CN110831182B (zh) * 2018-08-10 2023-09-26 华为技术有限公司 一种资源分配方法、相关设备及装置
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