US20150036609A1 - Method and apparatus for transmitting reference signal - Google Patents

Method and apparatus for transmitting reference signal Download PDF

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Publication number
US20150036609A1
US20150036609A1 US14/382,708 US201314382708A US2015036609A1 US 20150036609 A1 US20150036609 A1 US 20150036609A1 US 201314382708 A US201314382708 A US 201314382708A US 2015036609 A1 US2015036609 A1 US 2015036609A1
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Prior art keywords
subcarrier
ofdm symbol
transmitted
signal
urs
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US14/382,708
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English (en)
Inventor
Bonghoe Kim
Yunjung Yi
Suckchel YANG
Hanbyul Seo
Joonkui AHN
Dongyoun Seo
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LG Electronics Inc
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LG Electronics Inc
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Priority to US14/382,708 priority Critical patent/US20150036609A1/en
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SEO, HANBYUL, AHN, JOONKUI, KIM, BONGHOE, YANG, SUCKCHEL, YI, YUNJUNG, SEO, DONGYOUN
Publication of US20150036609A1 publication Critical patent/US20150036609A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and an apparatus for transmitting a reference signal.
  • Enhancement of the capacity and the transmission coverage targeted by the LTE release 12 may be achieved by small cell enhancement based on inter-site carrier aggregation and inter-LTE-wireless local area network (WLAN) integration and the macro cell enhancement.
  • WLAN wireless local area network
  • the size of the cell decreases, inter-cell movement of a UE frequently occurs, and as a result, the quantity of traffics signaled when the UE moves may increase.
  • signaling transmitted to a core network in a radio access network (RAN) is decreased by using the small cell enhancement to optimize a small cell.
  • RAN radio access network
  • the new carrier type is a frame type which is newly defined differently from a legacy frame configuration.
  • the NCT may be a carrier type optimized to the small cell, but may be applied to even the macro cell.
  • the NCT may decrease overhead which occurs by transmitting a cell-specific reference signal (CRS) and demodulate a downlink control channel based on a demodulation reference signal (DM-RS).
  • CRS cell-specific reference signal
  • DM-RS demodulation reference signal
  • Energy of a base station may be saved and interference which occurs in a heterogeneous network (HetNet) by newly defining the NCT.
  • HetNet heterogeneous network
  • reference signal overhead which occurs at the time of transmitting data may be decreased by using the NCT.
  • the NCT maintains the existing frame structure (e.g., CP length, subframe structure, and duplex mode), but may be defined by a carrier which is different in a structure of an actually transmitted reference signal and is not backward compatible (to e1-11 and below UEs).
  • the existing frame structure e.g., CP length, subframe structure, and duplex mode
  • An aspect of the present invention provides a method for transmitting a reference signal.
  • Another aspect of the present invention provides an apparatus for performing the method for transmitting a reference signal.
  • An exemplary embodiment of the present invention provides a method for receiving a reference signal including: receiving a synchronization signal in a subframe including a plurality of resource blocks (RBs) and a plurality of orthogonal frequency division multiplexing (OFDM) symbols; and receiving a reference signal in the subframe, in which the synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), the PSS is a signal received in a first OFDM symbol among the plurality of OFDM symbols, the SSS is a signal received in a second OFDM symbol among the plurality of OFDM symbols, a cell identifier is acquired based on the PSS and the SSS, the synchronization signal is received in center 6 RBs among the plurality of RBs, and the reference signal is received through the center 6 RBs in at least one OFDM symbol other than the first and second OFDM symbols among the plurality of OFDM symbols.
  • the synchronization signal includes a primary synchronization signal (PSS) and
  • the subframe may include 14 OFDM symbols and 12 subcarriers, the first OFDM symbol may be temporally a seventh OFDM symbol, the second OFDM symbol may be temporally a sixth OFDM symbol, the reference signal as the signal received through at least one resource element set between the first resource element set and the second resource element set may be the signal created based on the UE identifier, the first resource element set may be a first subcarrier, a sixth subcarrier, and an eleventh subcarrier in a third OFDM symbol, the first subcarrier, the sixth subcarrier, and the eleventh subcarrier in a fourth OFDM symbol, the first subcarrier, the sixth subcarrier, and the eleventh subcarrier in a 10-th OFDM symbol, and the first subcarrier, the sixth subcarrier, and the eleventh subcarrier in a 11-th OFDM symbol, and the second resource element set may be a second subcarrier, a seventh subcarrier, and a twelfth subcarrier in a third OFDM symbol, the
  • Another exemplary embodiment of the present invention provides user equipment receiving a reference signal in a wireless communication system including a processor, in which the processor is implemented to receive a synchronization signal in a subframe including a plurality of resource blocks (RBs) and a plurality of orthogonal frequency division multiplexing (OFDM) symbols and receive a reference signal in the subframe,
  • the synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)
  • PSS is a signal received in a first OFDM symbol among the plurality of OFDM symbols
  • the SSS is a signal received in a second OFDM symbol among the plurality of OFDM symbols
  • a cell identifier is acquired based on the PSS and the SSS
  • the synchronization signal is received in center 6 RBs among the plurality of RBs
  • the reference signal is received through the center 6 RBs in at least one OFDM symbol other than the first and second OFDM symbols among the plurality of OFDM symbols.
  • the subframe may include 14 OFDM symbols and 12 subcarriers, the first OFDM symbol may be temporally a seventh OFDM symbol, the second OFDM symbol may be temporally a sixth OFDM symbol, the reference signal as the signal received through at least one resource element set between the first resource element set and the second resource element set may be the signal created based on the UE identifier, the first resource element set may be a first subcarrier, a sixth subcarrier, and an eleventh subcarrier in a third OFDM symbol, the first subcarrier, the sixth subcarrier, and the eleventh subcarrier in a fourth OFDM symbol, the first subcarrier, the sixth subcarrier, and the eleventh subcarrier in a 10-th OFDM symbol, and the first subcarrier, the sixth subcarrier, and the eleventh subcarrier in a 11-th OFDM symbol, and the second resource element set may be a second subcarrier, a seventh subcarrier, and a twelfth subcarrier in a third OFDM symbol, the
  • the correct channel estimation is performed based on the reference signal.
  • FIG. 1 illustrates the structure of a radio frame in 3rd Generation Partnership Project (3GPP) long term evolution (LTE).
  • 3GPP 3rd Generation Partnership Project
  • LTE long term evolution
  • FIG. 2 illustrates one example of a resource grid for a downlink slot.
  • FIG. 3 illustrates the structure of a downlink subframe.
  • FIG. 4 shows a structure of an uplink subframe.
  • FIG. 5 is a conceptual diagram illustrating carrier aggregation.
  • FIG. 6 is a conceptual diagram illustrating a P-cell and an S-cell.
  • FIG. 7 is a conceptual diagram illustrating a method for setting and activating a cell at the time of performing the carrier aggregation.
  • FIG. 8 is a conceptual diagram illustrating a synchronized carrier and a non-synchronized carrier according to an embodiment of the present invention.
  • FIG. 9 is a conceptual diagram illustrating a synchronization method of a UE that receives the synchronous carrier according to the embodiment of the present invention.
  • FIG. 10 is a conceptual diagram illustrating an available CP combination of a subframe transmitted in the synchronized carrier and a synchronization reference carrier according to the embodiment of the present invention.
  • FIG. 11 is a conceptual diagram illustrating a method for transmitting a reference signal according to an embodiment of the present invention.
  • FIG. 12 is a conceptual diagram of a URS pattern in a subframe according to an embodiment of the present invention.
  • FIG. 13 is a conceptual diagram illustrating a method for precoding PDSCH data included in an RBG according to an embodiment of the present invention.
  • FIGS. 14 to 16 are conceptual diagrams illustrating a URS pattern according to an embodiment of the present invention.
  • FIGS. 16 to 17 illustrate the URS pattern according to the embodiment of the present invention.
  • FIG. 18 is a conceptual diagram illustrating a special subframe in a TDD scheme.
  • FIG. 19 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • FIG. 20 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • FIG. 21 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • FIG. 22 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • FIG. 23 is a schematic diagram illustrating a URS transmission frequency bandwidth according to the exemplary embodiment of the present invention.
  • FIG. 24 is a schematic diagram illustrating a URS transmission frequency bandwidth according to the exemplary embodiment of the present invention.
  • FIG. 25 is a schematic diagram illustrating a PRB bundling method according to the exemplary embodiment of the present invention.
  • FIG. 26 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention.
  • a wireless device may be fixed or movable and may be called other terms such as user equipment (UE), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a personal digital assistant (PDA), a wireless modem, a handheld device, and the like.
  • the wireless device may be a device that supports only data communication, such as a machine-type communication (MTC) device.
  • MTC machine-type communication
  • a base station generally represents a fixed station that communicates with the wireless device, and may be called different terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point an access point
  • LTE long term evolution
  • TS 3GPP technical specification
  • FIG. 1 illustrates the structure of a radio frame in 3rd Generation Partnership Project (3GPP) long term evolution (LTE).
  • 3GPP 3rd Generation Partnership Project
  • LTE long term evolution
  • the structure of the radio frame 10 in the 3GPP LTE may refer to Clause 5 of 3rd Generation Partnership Project (3GPP) TS 36.211 V8.2.0 ( 2008 - 03 ) “Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)”.
  • 3GPP 3rd Generation Partnership Project
  • TS 36.211 V8.2.0 2008 - 03
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • Physical channels and modulation (Release 8)
  • the radio frame 100 is constituted by 10 subframes, and one subframe 120 is constituted by two slots 140 .
  • an index may be applied according to the slot 140 of slots #0 to #19 or the index may be applied according to the subframe 120 of subframes #0 to 9.
  • Subframe #0 may include slot #0 and slot #1.
  • a time required to transmit one subframe 120 is referred to as a transmission time interval (TTI).
  • TTI may be a scheduling unit for data transmission.
  • the length of one radio subframe 100 may be 10 ms
  • the length of one subframe 120 may be 1 ms
  • the length of one slot 140 may be 0.5 ms.
  • One slot 140 includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain, and a plurality of subcarriers in a frequency domain. Since the 3GPP LTE uses the OFDMA in the downlink, the OFDM symbol is used to express one symbol period and may be called other name according to a multiple access scheme. For example, when a single carrier-frequency division multiple access (SC-FDMA) is used as an uplink multiple access scheme, the OFDM symbol may be called an SC-FDMA symbol.
  • a resource block (RB) includes a plurality of contiguous subcarriers in one slot as a resource allocation unit. The resource block will be disclosed in detail in FIG. 2 .
  • the number of subframes 120 included in the radio frame 100 , the number of slots 140 included in the subframe 120 , or the number of OFDM symbols included in the slot 140 is variously changed to be defined as a new radio frame format.
  • the 3GPP LTE defines that one slot includes 7 OFDM symbols when a normal cyclic prefix (CP) is used, and one slot includes 6 OFDM symbols when an extended CP is used.
  • CP normal cyclic prefix
  • the wireless communication system may be generally divided into a frequency division duplex (FDD) scheme and a time division duplex (TDD) scheme.
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • the uplink transmission and the downlink transmission are performed at different timings while occupying the same frequency band.
  • a channel response of the TDD scheme is substantially reciprocal. This means that a downlink channel response and an uplink channel response are almost the same as each other in a given frequency domain. Accordingly, in the wireless communication system based on the TDD, the downlink channel response may be advantageously acquired from the uplink channel response.
  • the downlink transmission by the base station and the uplink transmission by the UE may not simultaneously be performed.
  • the uplink transmission and the downlink transmission are performed in different subframes.
  • FIG. 2 illustrates one example of a resource grid for a downlink slot.
  • the downlink slot includes a plurality of OFDM symbols in the time domain, and includes NRB resource blocks in the frequency domain.
  • NRB which is the number of resource blocks included in the downlink slot is subordinate to a downlink transmission bandwidth set in a cell.
  • the NRB may be any one of 6 to 110 according to the used transmission bandwidth.
  • One resource block 200 includes a plurality of subcarriers in the frequency domain.
  • the structure of an uplink slot may also be the same as that of the downlink slot.
  • Each element on the resource grid is called a resource element 220 .
  • the resource element 220 on the resource grid may be identified by a pair of indexes (k,l) in the slot.
  • one resource block 200 is 7 ⁇ 12 resource elements 220 which are constituted by 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of the OFDM symbols and the number of the subcarriers in the resource block 220 are not limited thereto.
  • the number of the OFDM symbols and the number of the subcarriers may be variously changed depending on the length of the CP, frequency spacing, and the like. For example, in the case of a normal CP, the number of OFDM symbols is 7 and in the case of an extended CP, the number of OFDM symbols is 6.
  • the number of subcarriers in one OFDM symbol one of 128, 256, 512, 1024, 1536, and 2048 may be selected and used.
  • FIG. 3 illustrates the structure of a downlink subframe.
  • the downlink subframe 300 includes two slots 310 and 320 in the time domain and each of the slots 310 and 320 includes 7 OFDM symbols in the normal CP. Preceding maximum 3 OFDM symbols (maximum 4 OFDM symbols for a 1.4 Mhz bandwidth) of a first slot 310 in the subframe 300 are a control region 350 to which control channels are allocated, and residual OFDM symbols become a data region 360 to which a physical downlink shared channel (PDSCH) is allocated.
  • PDSCH physical downlink shared channel
  • a PUCCH may carry resource allocation and a transmission format of a downlink-shared channel (DL-SCH), resource allocation information of an uplink shared channel (UL-SCH), paging information on a PCH, system information on the DL-SCH, resource allocation of an upper layer control message such as a random access response transmitted on the PDSCH, a set of transmission power control commands for individual UEs in a predetermined UE group, and activation of voice over Internet protocol (VoIP).
  • a plurality of PDCCH regions may be transmitted in the control region 350 , and the UE may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on aggregation of one or several contiguous control channel elements (CCEs).
  • CCEs contiguous control channel elements
  • the CCE is a logical allocation unit used to provide to the coding rate to the PDCCH depending on a state of a radio channel.
  • the CCEs correspond to a plurality of resource element groups.
  • a format of the PDCCH and the bit number of an available PDCCH are determined according to a correlation of the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the downlink control information (DCI) to be sent to the UE and affixes a cyclic redundancy check (CRC) to the control information.
  • DCI downlink control information
  • CRC cyclic redundancy check
  • a unique identifier (radio network temporary identifier (RNTI)) is masked on the CRC according to an owner or a purpose of the PDCCH.
  • RNTI radio network temporary identifier
  • a unique identifier of the UE for example, a cell (C)-RNTI may be masked on the CRC.
  • a paging indication identifier for example, a paging (P)-RNTI may be masked on the CRC.
  • a system information (SIB)-RNTI may be masked on the CRC.
  • SIB system information block
  • RA random access
  • FIG. 4 shows a structure of an uplink subframe.
  • the uplink subframe may be divided into control regions 430 and 440 and a data region 450 in the frequency domain.
  • a physical uplink control channel (PUCCH) for transmitting the uplink control information is allocated to the control regions 430 and 440 .
  • a physical uplink shared channel (PUSCH) for transmitting data is allocated to the data region 450 .
  • the UE may support simultaneous transmission of the PUSCH and the PUCCH.
  • a PUCCH for one UE is allocated to a resource block (RB) pair in the subframe 400 .
  • Resource blocks that belong to the RB pair occupy different subcarriers in first and second slots 410 and 420 , respectively.
  • a frequency occupied by the resource blocks that belongs to the RB pair allocated to the PUCCH is changed based on a slot boundary. This means that the RB pair allocated to the PUCCH is frequency-hopped on the slot boundary.
  • the UE transmits the uplink control information through different subcarriers with time to acquire a frequency diversity gain.
  • m is a position index representing a logical frequency domain position of the resource block pair allocated to the PUCCH in the subframe.
  • the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel status, a scheduling request (SR) which is an uplink radio resource allocation request, and the like.
  • HARQ hybrid automatic repeat request
  • ACK acknowledgement
  • NACK non-acknowledgement
  • CQI channel quality indicator
  • SR scheduling request
  • the PUSCH is mapped in the uplink shared channel (UL-SCH) which is a transport channel.
  • 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 acquired by multiplexing the transport block for the UL-SCH and the control information.
  • the control information multiplexed to the data may include a CQI, a precoding matrix indicator (PMI), HARQ, a rank indicator (RI), and the like.
  • the uplink data may be constituted by only the control information.
  • CA carrier aggregation
  • Carrier aggregation as a technology that aggregates two or more component carriers (CCs) is introduced in LTE-Advanced in order to support aggregation of a transmission bandwidth of 100 MHz and a spectrum.
  • the carrier aggregation technology supports scalability to enable aggregation up to a wide frequency band such as 100 MHz.
  • FIG. 5 is a conceptual diagram illustrating carrier aggregation.
  • FIG. 5(A) illustrates one single component carrier (CC).
  • One CC may be an uplink frequency band 500 and a downlink frequency band 520 of 20 MHz.
  • FIG. 5(B) illustrates multiple CCs.
  • the plurality of CCs may be, for example, an uplink frequency band 540 and a downlink frequency band 560 of 60 MHz in which the uplink frequency band and the downlink frequency band of 20 MHz are aggregated.
  • the base station performs the carrier aggregation to transmit data to the UE through the plurality of downlink CCs.
  • the base station may enable the downlink transmission by using N downlink CCs. In this case, if the UE may receive downlink data only through M (M is a natural number which is equal to or smaller than N) downlink CCs, the UE may receive only the downlink data transmitted from the base station through M downlink CCs.
  • the base station may set a frequency bandwidth corresponding to L (L is a natural number which is equal to or smaller than M and N) downlink CCs as a main CC and operate the frequency bandwidth.
  • L is a natural number which is equal to or smaller than M and N
  • the UE may preferentially monitor and receive data which the base station transmits through the main CC.
  • the CC may be distinguished according to the cell.
  • a carrier corresponding to the CC of the P-cell among the carriers used in the downlink and the uplink is referred to as a primary cell component carrier (PCC) and a carrier corresponding to the CC of the S-cell is referred to as a secondary cell component carrier (SCC).
  • PCC primary cell component carrier
  • SCC secondary cell component carrier
  • FIG. 6 is a conceptual diagram illustrating a P-cell and an S-cell.
  • the base station may perform the carrier aggregation based on the PCC of the P-cell 600 and the SCC of one or more S-cells 620 .
  • the base station determines one cell as the P-cell 600 and residual cells may be determined as the S-cell 620 .
  • the base station may aggregate the CCs of the determined P-cell 600 and S-cell 620 and transmit data to the UE by using the aggregated frequency bandwidth.
  • the UE may also transmit data to the base station by using the aggregated frequency bandwidth.
  • FIG. 6 illustrates the case where transmission coverage of data transmitted based on the PCC of the P-cell 600 is larger than that of data transmitted based on the SCC of the S-cell 620 .
  • the UE may perform radio resource control (RRC) connection with a network through the PCC of the P-cell 600 . Further, the UE may attempt the random access to the base station through a physical random access channel (PRACH) based on a signal signaled through the PCC. That is, the UE may perform an initial connection establishment process or a connection re-establishment process to the base station through the PCC in a carrier aggregation environment.
  • RRC radio resource control
  • PRACH physical random access channel
  • the SCC of the S-cell 620 may be used to provide an additional radio resource.
  • the UE In order to perform carrier aggregation of adding the SCC to the PCC, the UE should perform neighbor cell measurement of acquiring information on a neighbor cell.
  • the base station may determine whether to aggregate the SCC to the PCC based on the neighbor cell measurement performed by the UE.
  • the base station may transmit PDCCH data to the UE through the PCC.
  • the PDCCH data may include PDSCH data allocation information transmitted through a downlink PCC band and a downlink SCC band and information to acknowledge data transmission through the uplink.
  • the P-cell 600 and the S-cell 620 may perform the carrier aggregation through configuration and activation operations, and transmit and receive data through an aggregated frequency band.
  • FIG. 7 is a conceptual diagram illustrating a method for setting and activating a cell at the time of performing the carrier aggregation.
  • configured cells 720 , 740 , and 760 indicate cells determined so as to perform the carrier aggregation for a CC of a corresponding cell among cells of the base station based on a measurement report transmitted by the UE.
  • the configured cells 720 , 740 , and 760 may be configured differently for UEs (UE A, UE B, and UE C).
  • activated cells 750 and 760 cells in which uplink transmission and downlink transmission are actually performed between the UE and the base station through the CC are referred to as activated cells 750 and 760 .
  • the P-cell may be a continuously activated cell 750 .
  • a cell index of the P-cell is indicated as 0.
  • the UE may report channel state information (CSI) and transmit the SRA in order to transmit the channel state information of the downlink and the downlink based on the CCs of the configured cells 720 , 740 , and 760 .
  • CSI channel state information
  • a de-activated cell 780 is a cell configured in such a manner that the uplink transmission and the downlink transmission are not performed through the CC of the corresponding cell based on a command of the base station or a timer operation.
  • the CSI reporting and the SRS transmission of the UE may also be stopped in the de-activated cell 780 .
  • the UE in order to perform the carrier aggregation, the UE should perform the neighbor cell measurement of acquiring the information on the neighbor cell.
  • the UE may use a common RS (cell specific RS) transmitted through the SCC by the base station as a reference signal for performing radio resource management (RRM) measurement of the neighbor cell.
  • RRM radio resource management
  • Carriers included in the SCC may be divided into a synchronized carrier and a non-synchronized carrier.
  • FIG. 8 is a conceptual diagram illustrating a synchronized carrier and a non-synchronized carrier according to an embodiment of the present invention.
  • a first SCC 820 may be a synchronized carrier 825
  • a second SCC 840 may be a non-synchronized carrier 845 .
  • the synchronized carrier 825 is a carrier that does not transmit a signal to perform synchronization to the carrier.
  • the UE synchronizes data transmitted through the synchronized carrier 825 based on a synchronized signal transmitted in a synchronization reference carrier to receive the data.
  • the synchronization reference carrier will be described below.
  • the non-synchronized carrier 845 is a carrier that transmits the signal to perform synchronization to the carrier.
  • a UE that operates in the non-synchronized carrier 845 may acquire synchronization of data based on the synchronization signal received in the non-synchronized carrier 845 without the synchronized signal transmitted in other carrier such as the synchronization reference carrier.
  • the non-synchronized carrier 845 may transmit a signal (for example, a primary synchronized signal (PSS)/a secondary synchronized signal (SSS)) required for synchronization.
  • a signal for example, a primary synchronized signal (PSS)/a secondary synchronized signal (SSS)
  • PSS primary synchronized signal
  • SSS secondary synchronized signal
  • a UE that receives the non-synchronized carrier 845 may perform synchronization based on a reference signal included in the non-synchronized carrier 845 .
  • the synchronized carrier 825 is a carrier that does not transmit the signal for synchronization.
  • the UE that receives the data transmitted through the synchronized carrier 825 may perform synchronization based on a synchronized signal transmitted in not the synchronized carrier 825 but the synchronization reference carrier.
  • the synchronization reference signal is a carrier included in a frequency band of a reference cell.
  • the reference cell is an adjacent cell that is operated in a frequency band having similar propagation and channel characteristics as the cell that transmits the synchronization carrier.
  • FIG. 9 is a conceptual diagram illustrating a synchronization method of a UE that receives the synchronous carrier according to the embodiment of the present invention.
  • a first SCC 920 may be a synchronized carrier 925
  • a second SCC 940 may be a non-synchronized carrier 945 . It is assumed and described that the second SCC 940 is a synchronization reference carrier 945 of the first SCC 920 .
  • a UE that receives data transmitted through the first SCC 920 may perform synchronization based on a synchronization signal transmitted in the synchronization reference carrier 945 .
  • the UE may perform synchronization tracking by receiving the synchronization signal transmitted through the synchronization reference carrier 945 during a specific time interval 950 .
  • the specific time interval 950 when the synchronization reference carrier 945 is received may be a predetermined periodic time interval. For example, an interval during the synchronization signal is transmitted through the synchronization reference carrier 945 may be set as the specific time interval 950 .
  • the UE may stop a series of operations of receiving downlink data through the synchronized carrier 925 during the interval during which the synchronization tracking is performed.
  • the UE may perform synchronization and RPM measurement for the synchronized carrier 925 based on the signal transmitted through the synchronization reference carrier 945 .
  • the RPM measurement may include reference signal received power (RSRP) measurement, reference single received quality (RSRQ) measurement, path loss measurement, and the like.
  • the synchronization and the RRM measurement using the synchronized carrier 925 and the synchronization reference carrier 945 may be performed by using various methods described below.
  • Method 1 A UE that is operated based on the synchronized carrier 925 may perform the synchronization and the RRM measurement (for example, the RSRP measurement, the RSRQ measurement, and the path loss measurement) by using the synchronization signal and the reference signal transmitted through the synchronization reference carrier 945 .
  • the RRM measurement for example, the RSRP measurement, the RSRQ measurement, and the path loss measurement
  • Method 2 The UE that is operated based on the synchronized carrier 925 may perform synchronization by using the synchronization signal transmitted through the synchronization reference carrier 945 .
  • the RRM measurement of the UE may be performed based on a channel state information-reference signal (CSI-RS) or a cell specific reference signal (CRS) which is a reference signal transmitted to the UE through the synchronized carrier 925 .
  • CSI-RS channel state information-reference signal
  • CRS cell specific reference signal
  • Method 3 The UE that is operated based on the synchronized carrier 925 may perform the synchronization and the RRM measurement by using the synchronization signal and the reference signal transmitted through the synchronization reference carrier 945 . Further, simultaneously, the UE may perform the RRM measurement based on the CSI-RS or CRS which is the reference signal transmitted to the UE through the synchronized carrier 925 .
  • the UE that is operated based on the synchronized carrier 925 may perform the synchronization and the RRM measurement by using the synchronization signal and the reference signal transmitted through the synchronization reference carrier 945 . Further, simultaneously, the UE may perform the RRM measurement by using the CSI-RS or CRS which is the reference signal transmitted through the synchronized carrier 925 .
  • Method 4 some (for example, the RSRP measurement) of the RRM measurement method may be performed by using the synchronization reference carrier 945 , and some (for example, RSRQ measurement and the path loss measurement) of the RRM measurement method may be performed by using the synchronized carrier 925 .
  • the UE should search for the S-cell to be measured and acquire synchronization in order to measure the RRM measurement for the SCC of the S-cell. If the SCC to be measured is the synchronized carrier 925 , the UE should receive the synchronization signal from the synchronization reference carrier 945 of the reference cell. Accordingly, the reference cell should be one cell among cells which the UE may search for and in which the UE may receive the signal. If a specific cell is indicated to the UE as the reference cell by a higher layer signal, the UE may perform the synchronization and/or the RRM measurement based on the signal transmitted from the indicated reference cell.
  • the UE needs to perform the RRM measurement for even the SCC which is the synchronized carrier 925 .
  • the UE since the base station does not transmit the synchronization single through the synchronized carrier 925 , the UE may not directly measure the radio resource management through the synchronized carrier 925 . Accordingly, as described above, the UE may the RRM measurement for the SCC which is the synchronized carrier 925 by using the synchronization reference carrier 945 instead of the synchronized carrier 925 . That is, after the RRM measurement for the SCC 925 is performed based on the synchronization reference carrier 945 of the reference cell, whether to carrier-aggregate the SCC 925 may be determined.
  • the base station may perform configuration and activation for the synchronized carrier 925 based on a result of the RRM measurement using the synchronization reference carrier 945 performed by the UE.
  • Configuring the carrier means performing the carrier aggregation for the carrier based on a measurement report for the carrier.
  • Activating the carrier means actually transmitting and receiving the PDSCH data and the PDCCH data through the carrier after configuring the carrier.
  • Method 1 A method in which the synchronized carrier 925 and the synchronization reference carrier 945 are independently configured/activated.
  • Method 1 whether the synchronous carrier 925 and the synchronization reference carrier 945 are configured and activated may be independently determined.
  • Method 2 A method of simultaneously configuring the synchronous carrier 925 and the synchronization reference carrier 945 .
  • Method 2 the synchronous carrier 925 and the synchronization reference carrier 945 are simultaneously configured. However, whether the synchronous carrier 925 and the synchronization reference carrier 945 are activated may not be simultaneously determined.
  • Methods 1 and 2 whether a carrier used for the data transmission is the synchronous carrier 925 at the time of configuring and activating the synchronous carrier 925 may be notified to the UE.
  • the base station may transmit information on the synchronized carrier 925 to the UE.
  • the synchronous carrier 925 and the synchronization reference carrier 945 are simultaneously configured, if the length of a cyclic prefix (CP) of a subframe transmitted through the synchronization reference carrier 945 is larger than the length of a CP transmitted through the synchronization carrier 925 , even though the UE acquires timing synchronization based on the synchronization signal transmitted in the synchronization reference carrier 945 , it may not be assured whether the timing synchronization of the data transmitted through the synchronized carrier is accurate.
  • CP cyclic prefix
  • FIG. 10 is a conceptual diagram illustrating an available CP combination of a subframe transmitted in the synchronized carrier and a synchronization reference carrier according to the embodiment of the present invention.
  • FIG. 10 a combination is illustrated, in which subframes transmitted in the synchronized carrier and the synchronization reference carrier may be used as the CP.
  • the length of the CP of the subframe transmitted through the synchronization reference carrier should be equal to or smaller than the length of the CP of the subframe transmitted through the synchronized carrier. That is, only three CP combinations corresponding to FIGS. 10(A) , 10 (B), and 10 (C) may be used as the CP of the subframe transmitted through the synchronization reference carrier and the synchronized carrier. Three CP combinations will be described below.
  • the subframe transmitted through the synchronization reference carrier is a normal CP
  • the subframe transmitted through the synchronized carrier is the normal CP
  • the subframe transmitted through the synchronization reference carrier is a normal CP and the subframe transmitted through the synchronized carrier is an extended CP
  • the subframe transmitted through the synchronization reference carrier is the extended CP and the subframe transmitted through the synchronized carrier is the extended CP
  • an independent cell ID may not be granted to the S-cell in which the SCC is the synchronized carrier.
  • the cell ID of the S-cell in which the SCC is the synchronized carrier may be an ID of the reference cell, the ID of the P-cell, or a value set in a higher layer, which is substituted with the cell ID.
  • the cell ID is not granted to the S-cell in which the SCC is the synchronized carrier, and as a result, a problem of cell deployment, which may occur due to insufficiency in cell ID may be solved.
  • scrambling sequences of the PDSCH/demodulation reference signal (DM-RS)/CSI-RS using the cell ID as a sequence creation parameter may be equally initialized. That is, a signal transmitted through the synchronization reference carrier and a signal transmitted through the synchronized carrier may initialize the scrambling sequence by using a parameter based on the same cell ID.
  • DM-RS demodulation reference signal
  • initializing of the scrambling sequence of a PDSCH corresponding to an q ⁇ 0,1 ⁇ -th codeword may be expressed as shown in Equation 1 below.
  • c init ⁇ n RNTI ⁇ 2 14 + q ⁇ 2 13 + ⁇ n s / 2 ⁇ ⁇ 2 9 + A for ⁇ ⁇ P ⁇ ⁇ D ⁇ ⁇ S ⁇ ⁇ C ⁇ ⁇ H ⁇ Equation ⁇ ⁇ 1 ⁇
  • A is a parameter based on the cell ID. Accordingly, A may vary depending on a value of the ID of the S-cell in which the SCC is the synchronized carrier.
  • the ID of the S-cell may be an ID of the S-cell in which the SCC is the synchronization reference carrier, the ID of the P-cell, or a value set in the higher layer, which is substituted with the cell ID.
  • initializing the scrambling sequence of the DM-RS may be expressed as shown in Equation 2 below.
  • B is also the parameter based on the cell ID. Accordingly, B may vary depending on the value of the ID of the S-cell in which the SCC is the synchronized carrier.
  • the ID of the S-cell may be an ID of the S-cell in which the SCC is the synchronization reference carrier, the ID of the P-cell, or a value set in the higher layer, which is substituted with the cell ID.
  • initializing the scrambling sequence of the CSI-RS may be expressed as shown in Equation 3 below.
  • C may also vary depending on the value of the ID of the S-cell in which the SCC is the synchronized carrier similarly as A and B.
  • the ID of the S-cell may be an ID of the S-cell in which the SCC is the synchronization reference carrier, the ID of the P-cell, or a value set in the higher layer, which is substituted with the cell ID.
  • the S-cell in which the SCC is the synchronized carrier may prevent the insufficiency in cell ID by using the cell ID of the reference cell, the cell ID of the P-cell, or the value set in the higher layer, which is substituted with the cell ID, without independently using the cell ID.
  • the UE may determine whether the SCC is in an in-synch state or in an out-of-synch state. When a reference signal having sufficient power for the UE to stably decode the PDCCH data is transmitted, the UE assumes that a radio link is in the in-synch. In the inverse case, it may be assumed that the radio link is in the out-of-synch.
  • the UE may monitor the reference signal transmitted through the downlink in order to determine whether the radio link is in the in-synch.
  • the UE may determine whether to decode the PDCCH data by measuring an RRM measurement parameter such as reference signal received power (RSRP).
  • RSRP reference signal received power
  • respective use equipments may measure the received reference signal received power by determining a threshold value of the individual reference signal received power.
  • the UE may determine whether to decode the received PDCCH data based on the received reference signal received power.
  • whether data transmitted through the radio link is in the out-of-synch may be determined based on the P-cell. That is, when it is determined whether the radio link is in the out-of-synch based on the P-cell by monitoring whether the radio link is in the out-of-synch in only the P-cell, it may be regarded that the radio link for all S-cells is also in the out-of-synch. Further, when it is determined that the radio link is in the in-synch based on the P-cell, it may be regarded that the radio link for all S-cells is in the in-synch.
  • the S-cell in which the SCC is the synchronized carrier when activated, the S-cell may be deactivated according to a measurement result of the synchronization reference carrier.
  • a new-type PDCCH (for example, an enhanced (e)-PDCCH) may be transmitted without satisfying backward compatibility.
  • the following reference may be used as a reference for the UE to determine whether the SCC is in the out-of-synch.
  • the new-type PDCCH is the e-PDCCH.
  • Method 1 The UE may measure downlink radio link quality by using the CSI-RS transmitted through the synchronization reference carrier from the base station.
  • the UE maps hypothetical error rate of the e-PDCCH based on the measured downlink radio link quality to determine whether to synchronize the SCC based thereon.
  • Method 2 The UE may map the hypothetical error rate of the e-PDCCH by using the common RS or the CSI-RS transmitted through the synchronization reference carrier from the base station. The UE may determine whether to synchronize the SCC based on the mapped hypothetical error rate.
  • Method 3 The UE may map the hypothetical error rate of the e-PDCCH by using the DM-RS transmitted from the base station through the synchronization reference carrier. The UE may determine whether to synchronize the SCC based on the mapped hypothetical error rate.
  • the UE may ensure synchronization of data transmitted through the SCC based on a signal (for example, a PSS/SSS, and the like) required for synchronization, which is transmitted through the non-synchronized carrier without using the aforementioned methods.
  • a signal for example, a PSS/SSS, and the like
  • the base station may transmit the PSS/SSS which is the synchronized signal only in a specific subframe.
  • the PSS/SSS may be transmitted with being included in subframe #0 which is the first subframe of the frame and subframe #5 which is the sixth subframe of the frame.
  • FDD frequency division duplex
  • a reference signal used for demodulating the PDSCH data may be divided into a cell specific reference signal (CRS) or a UE specific reference signal (URS) according to a transmission mode (TM).
  • CRS cell specific reference signal
  • URS UE specific reference signal
  • TM transmission mode
  • a resource in which the URS is transmitted and a resource in which the PSS/SSS is transmitted may be duplicated.
  • the URS is not transmitted in a resource element (RE) in which the PSS/SSS is transmitted.
  • the PDSCH data transmitted with being included in the RB in which the PSS/SSS is transmitted is discarded.
  • the PSS/SSS is transmitted, in the case where the PSS/SSS is transmitted by adjusting the position of the resource in which the UE specific RS (URS) is transmitted so as not to duplicate the position of the PSS/SSS, the URS may be transmitted and the PDSCH data may also be transmitted even in the RB in which the PSS/SSS is transmitted.
  • URS UE specific RS
  • a URS pattern and a CSI-RS pattern disclosed in the embodiment of the present invention is one example for a pattern of allocating the resource so that the resource in which the PSS/SSS is transmitted and the resource in which the URS and the CSI-RS are transmitted are not duplicated with each other.
  • the URS pattern and the CSI pattern that prevent duplication with the resource in which the PSS/SSS is transmitted according to the embodiment of the present invention may be implemented by various patterns and the embodiment is also included in the claims of the present invention.
  • FIG. 11 is a conceptual diagram illustrating a method for transmitting a reference signal according to an embodiment of the present invention.
  • FIG. 11 illustrates a pattern of a URS of a subframe in which the PSS/SSS is transmitted in a system using the FDD as the duplexing scheme and using the normal CP as the CP.
  • the URS pattern disclosed in FIG. 11 may be used in a total frequency bandwidth of the subframe 1100 in which the PSS/SSS is transmitted or in an area 1120 of a frequency bandwidth (for example, center 6 RBs) in which the PSS/SSS is transmitted or a frequency band including the center 6 RBs.
  • a frequency bandwidth for example, center 6 RBs
  • a newly defined URS may be transmitted each of the slots 1120 and 1130 in corresponding resource elements at positions of third OFDM symbols 1120 - 3 and 1130 - 3 and fourth OFDM symbols 1120 - 4 and 1130 - 4 on a time axis in each of the slots 1120 and 1130 , and ⁇ subcarrier #0( 1150 - 0 ), subcarrier #1( 1150 - 1 ) ⁇ , ⁇ subcarrier #5( 1150 - 5 ), subcarrier #6( 1150 - 6 ) ⁇ , ⁇ subcarrier #10( 1150 - 10 ), and subcarrier #11( 1150 - 11 ) ⁇ among 12 subcarriers included in a resource block pair (RBP) on a frequency axis.
  • RBP resource block pair
  • Antenna ports 7, 8, 11, and 13 may transmit the URS through ⁇ subcarrier #0( 1150 - 0 ), subcarrier #5( 1150 - 5 ), subcarrier #10( 1150 - 10 ) ⁇ , and antenna ports 9, 10, 12, and 14 may transmit the URS through ⁇ subcarrier #1( 1150 - 1 ), subcarrier #6( 1150 - 6 ), subcarrier #11( 1150 - 11 ) ⁇ .
  • a new URS pattern may be defined and used only up to a resource block group (RBG) including a boundary surface of a frequency resource in which the PSS/SSS is transmitted by considering the size of PRB bundling.
  • RBG resource block group
  • the UE may assume that precoding granularity is a plurality of RBs.
  • PRB bundled physical resource blocks (PRBs) may be precoded by using the same precoding vector.
  • a set of the PRB bundled PRBs is referred to as a precoding resource block group (PRG).
  • the size of the PRG may be determined according to the size of a system bandwidth.
  • the CSI-RS may be prevented from being transmitted in the duplicated resource areas.
  • the subframe in which the CSI-RS is transmitted is configured not to be duplicated with the subframe in which the PSS/SSS is transmitted to prevent the resources in which the CSI-RS and the URS are transmitted from being duplicated with each other.
  • a newly defined CSI-RS may also be limitatively used only in a predetermined region as the CSI-RS is transmitted only in the RB or subframe in which the PSS/SSS is transmitted.
  • the CSI-RS transmission pattern may be configured with the resource in which the newly defined URS is transmitted.
  • the resource in which the URS is transmitted and the resource in which the CSI-RS is transmitted are duplicated with each other by the newly defined URS pattern, it may be configured in such a manner that the CSI-RS is not transmitted and the URS is transmitted the duplicated resources.
  • FIG. 12 is a conceptual diagram of a URS pattern in a subframe according to an embodiment of the present invention.
  • FIG. 12 illustrates an embodiment of a pattern of the URS of the subframe in which the PSS/SSS is transmitted in a system using the frequency division duplex (FDD) as the duplexing method and the extended cyclic prefix (CP) as the CP.
  • FDD frequency division duplex
  • CP extended cyclic prefix
  • a newly defined URS may be transmitted to each of the slots 1220 and 1230 through resource elements corresponding to third OFDM symbols 1220 - 1 and 1230 - 1 and fourth OFDM symbols 1220 - 2 and 1230 - 2 on the time axis and subcarrier #1( 1250 - 1 ), subcarrier #4( 1250 - 4 ), subcarrier 7( 1250 - 7 ), and subcarrier #10( 1250 - 10 ) in an even-numbered slot 1220 on the frequency axis.
  • the newly defined URS may be transmitted through the resource elements corresponding to the third OFDM symbol 1230 - 1 and the fourth OFDM symbol 1230 - 2 on the time axis and subcarrier #0( 1250 - 0 ), subcarrier #3( 1250 - 3 ), subcarrier #6( 1250 - 6 ), subcarrier 9( 1250 - 9 ) on the frequency axis, in an odd-numbered slot 1230 .
  • Antenna port 7 and antenna port 8 may transmit the newly defined URS.
  • the URS pattern disclosed in FIG. 12 may be an effective pattern only in a subframe region in which the PSS/SSS is transmitted. That is, in a subframe region in which the PSS/SSS is not transmitted, the base station may transmit the URS to the UE by using a URS pattern other than the URS pattern disclosed in FIG. 12 .
  • the URS pattern disclosed in FIG. 12 may be effectively transmitted only in a frequency resource (for example, 6 RB) in which the PSS/SSS is limitatively transmitted.
  • the URS may be transmitted by using the URS pattern disclosed in FIG. 12 up to the RBG including the boundary surface of the frequency resource in which the PSS/SSS is transmitted by considering the size of the PRB bundling.
  • the resource in which the URS is transmitted and the resource in which the CSI-RS is transmitted which are defined in FIG. 12 may be duplicated with each other. It may be configured in such a manner that the CSI-RS is not transmitted and the URS is transmitted in the duplicated resources.
  • the subframe in which the CSI-RS is transmitted may be configured not to be duplicated with the subframe in which the PSS/SSS is transmitted.
  • the CSI-RS may not be transmitted in the subframe in which the PSS/SSS is transmitted. In this case, a collision on the transmission resources of the CSI-RS and the URS may be prevented.
  • the base station may signal the position of an OFDM symbol allocated through the PDSCH to the UE through higher layer signaling.
  • the NCT subframe maintains the existing frame structure (for example, the CP length, the subframe structure, and the duplex mode), but may be changed in a method in which an actually transmitted reference signal and/or control channel (PDCCH) data is transmitted.
  • PDCH actually transmitted reference signal and/or control channel
  • a parameter indicating the position of the OFDM symbol in which the PDSCH is started in the NCT subframe may be defined as a term called a data start parameter (1DataStart parameter).
  • the data start parameter may have values of 1 to 4.
  • the OFDM symbol corresponding to the value set as the data start parameter (1DataStart parameter) may be temporally later than the OFDM symbol in which the URS is transmitted.
  • the PDSCH data may be included from the fifth OFDM symbol of the subframe.
  • the UE may perform various following operations in demodulating the PDSCH data.
  • Method 1 The UE assumes that the PDSCH data is not transmitted.
  • the PDSCH data transmitted later than the transmitted URS may be discarded.
  • Method 2-1 The UE demodulates the PDSCH data by using even the URS of the OFDAM symbol transmitted earlier than the OFDM symbol corresponding to the data start parameter value together.
  • the PDSCH data may be demodulated based on the URS before the PDSCH data is transmitted.
  • Method 2-2 The UE demodulates the PDSCH data by using the URS of the OFDM symbol transmitted simultaneously with or later than the OFDM symbol corresponding to the data start parameter value. That is, in the case of Method 2-2, the URS that is transmitted earlier than the OFDM symbol corresponding to the data start parameter value is not used to demodulate the PDSCH data. In Method 2-2, only the URS transmitted through the OFDM symbol corresponding to the data start parameter value or the OFDM symbol larger than the data start parameter value is used to demodulate the PDSCH data. In this case, the corresponding UE assumes that the base station performs PDSCH transmission through a single antenna port.
  • the OFDM symbol corresponding to the data start parameter value and the OFDM symbol that transmits the URS before the data start parameter value may be symbols that perform code division multiplexing (CDM).
  • CDM code division multiplexing
  • a second OFDM symbol 0 included in the even-numbered slot( ) is transmitted earlier than the PDSCH data.
  • a third OFDM symbol 0 included in the even-numbered slot is transmitted in an OFDM symbol which is at the same data start position as the PDSCH data.
  • the third OFDM symbol is an OFMD symbol that performs the CDM with the second OFDM symbol.
  • the UE does not use the URS of the even-numbered slot for demodulating the PDSCH data.
  • the UE may demodulate the PDSCH data by using only the URS received through the odd-numbered slot.
  • a resource designated in such a manner that the URS is transmitted the even-numbered slot may be used for transmitting not the URS but the PDSCH data or in the corresponding resource region, the URS is not transmitted and puncturing may be achieved.
  • the 1DataStart value set in the higher layer may be limited to a value smaller than 4 by considering the position of the URS. For example, in the case of the general CP illustrated in FIG. 11 , the 1DataStart value may be set to 2, and in the case of the extended CP illustrated in FIG. 12 , the 1DataStart value may be set to 1.
  • the PDSCH data may be demodulated based on the URS.
  • the aforementioned PDSCH data demodulating method may be limitatively applied to the region where the newly defined URS is transmitted.
  • the UE specific RS (URS) may be defined only in the frequency band (for example, 6 RBs based on the center frequency) in which the PSS/SSS is transmitted
  • the aforementioned PDSCH data demodulating method may be limitatively applied to the frequency resource where the PSS/SSS is transmitted.
  • the aforementioned methods may be applied to even the downlink control channel included in the PDSCH data demodulated by using the URS.
  • the aforementioned methods may be applied to even the data transmitted through the control channel defined in the region other than the region where the legacy PDCCH is defined, such as the e-PDCCH.
  • whether to demodulate the e-PDCCH data may be determined based on the URS transmitted based on the position of the URS and the position of the OFDM symbol that transmits the e-PDCCH data.
  • the UE does not assume that the same precoding method is applied to the PDSCH data included in the RBG including the boundary in respect to the URS used for demodulating the PDSCH data.
  • FIG. 13 is a conceptual diagram illustrating a method for precoding PDSCH data included in an RBG according to an embodiment of the present invention.
  • the base station may not apply, in the RBG 1300 defined to include the boundary of the frequency resource in which the PSS/SSS is transmitted, the same precoding to the PDSCH data included in an RB 1300 - 2 which is the same as the PSS/SSS and the PDSCH data included in an RB 1300 - 1 which is not the same as the PSS/SSS.
  • the RBG 1300 corresponding to 3 RBs is allocated, which includes the boundary of the frequency resource in which the PSS/SSS is transmitted and in the RBG 1300 , and 1 RB 1300 - 2 among the RBs includes the frequency resource in which the PSS/SSS is transmitted.
  • the UE does not estimate that 2 RB 1300 - 1 in which the PSS/RSSS is not transmitted and 1 RB 1300 - 2 in which the PSS/SSS is transmitted among the 3 RBs use the same precoding. Accordingly, when the UE performs channel estimation by using the URS, the UE may not perform the channel estimation through a channel estimating method (for example, interpolation using the URS) using both a URS corresponding to the 2 RB 1300 - 1 and a URS corresponding to the 1 RB 1300 - 2 .
  • a channel estimating method for example, interpolation using the URS
  • the same precoding is applied to the RBG 1300 including the RB 1300 - 2 in which the PSS/SSS is transmitted and the RB 1300 - 1 in which the PSS/SSS is not transmitted, and only PDSCH data transmission of rank 1 may be permitted.
  • the newly defined URS pattern may be applied to only the RB 1300 - 2 in which the PSS/SSS is transmitted.
  • the URSs transmitted through the RBs included in the RBG may be different from each other. That is, since the URS patterns of the RBs in the RBG 1300 including the boundary may be different from each other, the URS multiplexed by using the CDM may not be applied to permit only transmission of rank 1.
  • using the PRB bundling may be limited in the subframe in which the PSS/SSS is transmitted or the frequency band in which the PSS/SSS is transmitted.
  • the UE may perform the demodulation without distinguishing the boundary of the frequency band in which the PSS/SSS is transmitted or not.
  • the base station may not transmit a URS defined in a slot which is duplicated with the position of the PSS/SSS in the frequency resource in which the PSS/SSS is transmitted. That is, the base station may transmit the URS only in one slot (for example, the even-numbered slot 1340 ) in which the PSS/SSS is not transmitted.
  • the UE may demodulate the PDSCH data based on the transmitted URS.
  • FIGS. 14 to 16 are conceptual diagrams illustrating a URS pattern according to an embodiment of the present invention.
  • FIG. 14(A) illustrates a URS transmitted by using the normal CP and through four antenna ports such as antenna ports 7, 8, 9, and 10.
  • the URS may be defined in resource elements of a sixth OFDM symbol 1430 - 5 and a seventh OFDM symbol 1430 - 6 in the odd-numbered slot 1430 on the time axis, and resource elements of ⁇ subcarrier #0( 1410 - 0 ), subcarrier #1( 1410 - 1 ) ⁇ , ⁇ subcarrier #5( 1410 - 5 ), subcarrier #6( 1410 - 6 ) ⁇ , and ⁇ subcarrier #10( 1410 - 10 ), subcarrier #11( 1410 - 11 ) ⁇ on the frequency axis.
  • Antennas 7 and 8 may transmit to the UE a URS defined in ⁇ subcarrier #0( 1410 - 0 ), subcarrier #5( 1410 - 5 ), subcarrier #10 ( 1410 - 10 ) ⁇ and antennas 9 and 10 may transmit to the UE a URS defined in ⁇ subcarrier #1( 1410 - 1 ), subcarrier #6( 1410 - 6 ), subcarrier #11( 1410 - 11 ) ⁇ .
  • the antennas ports 7 and 8 are multiplexed by using the code division multiplexing method, and the antenna ports 9 and 10 are also multiplexed by using the code division multiplexing method.
  • the (antenna ports 7, antenna 8) and (antenna ports 9, antenna 10) are multiplexed by the frequency division multiplexing (FDM) using different frequency bands. That is, the base station may perform up to transmission of rank 4 by using four antenna ports.
  • FIG. 14(B) defines a URS transmitted through a single antenna port such as antenna port 7 in the normal CP.
  • the position of the URS defined in FIG. 14(B) is the same as that in FIG. 14(A) .
  • the antenna 7 may be defined in subcarriers ⁇ subcarrier #0, subcarrier #1 ⁇ , ⁇ subcarrier #5, subcarrier #6 ⁇ , ⁇ subcarrier #10, subcarrier #11 ⁇ .
  • FIG. 14(B) illustrates a transmission method of the URS when transmission corresponding to rank 1 is performed by using one antenna port. Similarly as FIG. 12(A) , the URS is not transmitted in the even-numbered slot and the URS transmitted in the odd-numbered slot may be used to demodulate the PDSCH data.
  • the base station does not transmit the URS in the even-numbered slot to prevent a collision with the resource in which the PSS/SSS is transmitted.
  • the PDSCH data may be demodulated by using the URS transmitted in the odd-numbered slot.
  • FIG. 14(C) illustrates the URS pattern when the extended CP is used in the subframe.
  • the URS may be defined in resource elements of a fifth OFDM symbol 1470 - 4 and a sixth OFDM symbol 1470 - 5 in the odd-numbered slot 1470 on the time axis, and resource elements of ⁇ subcarrier #0( 1450 - 0 ), subcarrier #3( 1450 - 3 ) ⁇ , ⁇ subcarrier #5( 1450 - 5 ), subcarrier #6( 1450 - 6 ), subcarrier #5( 1450 - 9 ) ⁇ on the frequency axis.
  • the antennas 7 and 8 may transmit, to the UE, a URS defined in ⁇ subcarrier #0( 1450 - 0 ), subcarrier #3( 1450 - 3 ), subcarrier #6( 1450 - 6 ), subcarrier #9( 1450 - 9 ) ⁇ .
  • the antennas 7 and 8 are multiplexed by using the CDM method.
  • the URS is not transmitted in the even-numbered slot and the URS transmitted in the odd-numbered slot is used to demodulate the PDSCH data.
  • the URS may be transmitted by increasing transmission power at the time of transmitting the URS.
  • the UE may set a ratio of an energy per resource element (PDSCH EPRE) and a URS EPRE to ⁇ 3 dB in respect to the OFDM symbol in which the URS is transmitted in the case where the number of layers transmitted thereto is 2 or less and set the ratio to ⁇ 6 dB in the case where the number of layers transmitted thereto is more than 2.
  • the EPRE represents energy per resource element.
  • FIG. 15 illustrates the URS pattern defined in the TDD scheme according to an embodiment of the present invention.
  • FIG. 15 discloses the URS pattern when the URS is not transmitted in a part where the position of the resource in which the PSS/SSS is transmitted and the position of the resource in which the URS is transmitted are duplicated with each other, in respect to the TDD-scheme normal subframe using the time division duplex (TDD) as the duplexing scheme and using the normal CP as the CP.
  • TDD time division duplex
  • FIG. 15(A) discloses the URS transmitting method using four antenna ports.
  • the URS may be defined in resource elements of a sixth OFDM symbol 1520 - 6 and a seventh OFDM symbol 1520 - 7 in an even-numbered slot 1520 on the time axis, and resource elements of ⁇ subcarrier #0( 1510 - 0 ), subcarrier #1( 1510 - 1 ), subcarrier #5( 1510 - 5 ), subcarrier #6( 1510 - 6 ), subcarrier #10( 1510 - 10 ), subcarrier #11( 1510 - 11 ) ⁇ on the frequency axis.
  • the antenna ports 7 and 8 are multiplexed by using the CDM, and the antennas ports 9 and 10 are also multiplexed by the CDM. (The antenna ports 7 and 8) and (the antenna ports 9 and 10) are multiplexed by the FDM using different frequency bands. That is, the UE may perform up to transmission of rank 4 by using four antenna ports.
  • the base station may transmit the URS in resource elements of the sixth and seventh OFDM symbols on the time axis in the even-numbered slot and ⁇ subcarrier #0, subcarrier #1, subcarrier #5, subcarrier #6, subcarrier #10, subcarrier #11 ⁇ on the frequency axis.
  • FIG. 15(B) illustrates a transmission method of the URS when transmission corresponding to rank 1 is performed by using one antenna port in the TDD-scheme normal subframe.
  • the base station may transmit the URS in the even-numbered slot and not transmit the URS in the odd-numbered slot.
  • the UE may demodulate the PDSCH data based on the received URS.
  • FIGS. 16 and 17 illustrate the URS pattern according to the embodiment of the present invention.
  • FIGS. 16 and 17 disclose a URS pattern when the URS in the part where the positions of the PSS/SSS and the URS are duplicated with each other is not transmitted, in respect to a special subframe using the TDD as the duplexing scheme and using the normal CP as the CP.
  • the URS defined in the special subframe may be used by defining a URS different from the aforementioned TDD-scheme normal subframe in FIG. 15 .
  • FIG. 18 is a conceptual diagram illustrating a special subframe in a TDD scheme.
  • the special subframe represents subframes corresponding to index #1 1800 and index #6 1820 .
  • the special subframe is DwPTS (Downlink Pilot Time Slot:
  • the special subframe includes a downlink pilot time slot (DwPTS), 1830 , a guard period (GP) 1840 , and a uplink pilot time slot (UpPTS) 1850 .
  • the DwPTS 1830 is used in initial cell search, synchronization, or channel estimation in the UE.
  • the UpPTS 1850 is used to match channel estimation in the base station and uplink transmission synchronization of the UE.
  • the GP 1840 is a period for removing an interference which occurs in the uplink due to a multipath delay of the downlink signal between the uplink and the downlink.
  • the lengths of the DwPTS 1830 , the GP 1840 , and the UpPTS 1850 ) of the special frames 1800 and 1820 may be different from each other according to a set-up of the special frame.
  • the URS may be defined differently from each other according to the special subframe configuration.
  • the number of symbols corresponding to the DwPTS 1830 , the GP 1840 , and the UpPTS 1850 may vary depending on the configuration of the special subframe.
  • the configuration of the special frame is defined in 4.2 frame structure type 2 of 3GPP TS 36.211 v. 10.4.0“3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10) opened in December 2011.
  • the URS may be defined in a sixth OFDM symbol 1630 - 5 and a seventh OFDM symbol 1630 - 6 on the time axis in an even-numbered slot 1630 and ⁇ subframe #0( 1610 - 0 ), subframe #1( 1610 - 1 ), subframe #5( 1610 - 5 ), subframe #6( 1610 - 6 ), subframe #10( 1610 - 10 ), subframe #11( 1610 - 11 ) ⁇ on the frequency axis.
  • FIG. 16(A) illustrates a URS transmitting method using four antenna ports in the special subframe.
  • the antenna ports 7 and 8 may transmit a URS through ⁇ subframe #0( 1610 - 0 ), subframe #5( 1610 - 5 ), subframe #10( 1610 - 10 ) ⁇ , and the antennas #9 and #10 antenna ports 9 and 10 may transmit the URS through ⁇ subframe #1( 1610 - 1 ), subframe #6( 1610 - 6 ), subframe #11( 1610 - 11 ) ⁇ .
  • the antenna ports Antennas ports 7 and 8 are multiplexed by using the CDM, and the antennas ports 9 and 10 are also multiplexed by the CDM. (The antenna ports 7 and 8) and (the antenna ports 9 and 10) are multiplexed by the FDM using different frequency bands. That is, the UE may perform up to transmission of rank 4 by using four antenna ports.
  • FIG. 16(B) illustrates a transmission method of the URS when transmission corresponding to rank 1 is performed by using one antenna port in the TDD-scheme normal subframe when the special frame configuration is 3, 4, and 8.
  • the URS may be defined in the same resource element as in FIG. 16(A) .
  • the antenna 7 may transmit the defined URS to the UE.
  • FIG. 17 is a conceptual diagram illustrating the URS included in the subframe when the special frame configuration is 1, 2, 6, and 7.
  • the URS may be defined in a sixth OFDM symbol 1720 - 5 and a seventh OFDM symbol 1720 - 6 on the time axis in an odd-numbered slot 1720 , and ⁇ subframe #0( 1710 - 0 ), subframe #1( 1710 - 1 ), subframe #5( 1710 - 5 ), subframe #6( 1710 - 6 ), subframe #10( 1710 - 10 ), subframe #11( 1710 - 11 ) ⁇ on the frequency axis.
  • FIG. 17(A) illustrates a URS transmitting method using four antenna ports in the special subframe.
  • the antenna ports 7 and 8 may transmit a URS through ⁇ subframe #0( 1710 - 0 ), subframe #5( 1710 - 5 ), subframe #10( 1710 - 10 ) ⁇ , and the antenna ports 9 and 10 may transmit the URS through ⁇ subframe #1( 1710 - 1 ), subframe #6( 1710 - 6 ), subframe #11( 1710 - 11 ) ⁇ .
  • Antennas ports 7 and 8 are multiplexed by using the CDM and antennas ports 9 and 10 are also multiplexed by the CDM. (The antenna ports 7 and 8) and (the antenna ports 9 and 10) are multiplexed by the FDM using different frequency bands. That is, the UE may perform up to transmission of rank 4 by using four antenna ports.
  • FIG. 17(A) illustrates a transmission method of the URS when transmission corresponding to rank 1 is performed by using one antenna port in the TDD-scheme normal subframe when the special frame configuration is 1, 2, 6, and 7.
  • the URS may be defined in the same resource element as in FIG. 17(A) .
  • the antenna 7 may transmit the defined URS to the UE.
  • an RB may exist, in which the PSS/SSS transmitted at the same position as the position at which the PSS/SSS is transmitted is not transmitted in all frequency bands of one RB.
  • FIG. 19 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • the base station when the position of the resource element to which the URS is transmitted collides with the position of the resource transmitted by the PSS/SSS, the base station does not transmit the URS of the collided position to the UE.
  • the RB including the PSS/SSS may be present in only some frequency bandwidths of the RB among the RBs in which the PSS/SSS is included based on the central frequency.
  • the remaining resource area in which the PSS/SSS of the RB is not transmitted may include URSs 1910 , 1920 , 1960 , and 1970 .
  • the UE may enhance demodulation performance of the PDSCH data based on the URSs 1910 , 1920 , 1960 , and 1970 transmitted in the corresponding area.
  • the number of URSs transmitted from the URS antenna port x may be larger than the number of URSs transmitted from the URS antenna port y. Accordingly, the PDSCH data transmitted from the RB #k 1900 may perform PDSCH demodulation of the rank 1 based on the URS antenna port x.
  • the number of URSs 1960 and 1970 transmitted from the URS antenna port y may be larger than the number of URSs transmitted from the URS antenna port x. Accordingly, the PDSCH data transmitted from the RB #k 1950 may perform PDSCH demodulation of the rank 1 based on the URS antenna port y.
  • the URSs 1910 , 1920 , 1960 , and 1970 included and transmitted in the RB #k 1900 or the RB #k+6 1950 of FIG. 19 may not be used during the demodulation of the PDSCH data.
  • FIG. 20 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • FIG. 20 is a schematic diagram illustrating a method in which the URSs are not included even in the RB where the PSS/SSS is not transmitted in the entire frequency bandwidth.
  • RBs 2000 and 2050 in which the PSS/SSS does not fill all the frequency bands corresponding to one RB may not include the URS. This is to reduce complexity of the channel estimation.
  • the PDSCH data may be included and transmitted in the resource which does not transmit the URS.
  • the RBs may be divided into the RBs 2010 and 2020 including the PSS/SSS in all the frequency bandwidths, the RBs 2000 and 2050 including the PSS/SSS in some frequency bandwidths, and the RBs 2040 and 2060 without the PSS/SSS.
  • the UE may assume some or all of the following items during the demodulation of the PDSCH data.
  • the UE may assume the PDSCH data included in the RBs 2000 and 2050 including the PSS/SSS in some frequency bandwidths or the RBs 2010 and 2020 including the PSS/SSS in all the frequency bandwidths as data transmitted to the rank 1.
  • the UE may assume the PDSCH data included in the corresponding RBG as the data transmitted to the rank 1.
  • the UE may assume that the PDSCH data included in the RBs 2000 and 2050 including the PSS/SSS in some frequency bandwidths or the RBs 2010 and 2020 including the PSS/SSS in all the frequency bandwidths and the RBs 2040 and 2060 without the PSS/SSS to one RBG is not one RBG.
  • the UE may perform the demodulation for the PDSCH data received based on at least one assumption among the assumptions (1) to (3).
  • the UE may assume that the PDSCH data is transmitted in the area where the URS is punctured.
  • the UE may perform the demodulation by assuming the RB area where the URS is punctured as the data in which the base station is transmitted to as the rank 1. Further, the UE may assume that the RB where the URS is punctured and the RB where the URS is transmitted are not scheduled together.
  • FIG. 21 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • the position of the OFDM symbol in which URS is transmitted may be changed.
  • the OFDM symbol which transmits the URS only in some of the frequency bands such as the frequency bands in which the PSS/SSS is transmitted, may be changed.
  • the entire system bandwidth 2100 is assumed as a frequency bandwidth including 15 RBs including RBs having indexes of 0 to 14, and the frequency band in which the PSS/SSS is transmitted is assumed as the frequency band 2150 corresponding to 6 RBs.
  • the PSS/SSS may be transmitted in the entire bandwidth in RB #5, RB #6, RB #8, and RB #9 which are two RBs at both sides based on the RB #7 including the center frequency 2140 .
  • the PSS/SSS may be transmitted even in the area corresponding to six subcarriers which are positioned at a close place to the center frequency among 12 subcarriers included in five RBs RB #5, RB #6, RB #7, RB #8, and RB #9 and the RB #4 2110 and the RB #10 2120 which are RBs positioned at both ends of the five RBs.
  • a URS pattern which is newly defined so as not to collide with the PSS/SSS may be transmitted in another system band area as described above.
  • FIG. 22 is a schematic diagram illustrating a method of transmitting a URS according to the exemplary embodiment of the present invention.
  • FIG. 22 illustrates a method of transmitting a URS 2230 which is newly defined in a frequency resource where the PSS/SSS is transmitted.
  • a new URS pattern 2230 may be defined and used so that the signal where the PSS/SSS is transmitted and the URS do not overlap with each other.
  • a frequency bandwidth transmitting the new URS pattern so as not to overlap with the resource in which the PSS/SSS is included may be determined like FIG. 23 below.
  • FIG. 23 is a schematic diagram illustrating a URS transmission frequency bandwidth according to the exemplary embodiment of the present invention.
  • the demodulation performance of the PDSCH data transmitted from the corresponding RB may be enhanced by transmitting the URS in 7 RB areas 2320 which are x+1 RBs including x/2 RB at both sides based on the RB including the center frequency.
  • the URS when a difference between N and x is 2 or more and x is larger than 6, the URS may be transmitted in an area corresponding to (x ⁇ 1) RB including the center 6 RBs where the PBCH or the PSS/SSS is transmitted.
  • mod means a modulo operation.
  • the URS is transmitted in the frequency area corresponding to the center x RBs.
  • N corresponds to 19 RB and x is 11 RB 2340 .
  • the URS may be transmitted in the frequency band corresponding to the 10 RB 2460 based on the RB including the center frequency.
  • a URS pattern different from the URS defined in the PRB within the system bandwidth may be applied.
  • FIG. 24 is a schematic diagram illustrating a URS transmission frequency bandwidth according to the exemplary embodiment of the present invention.
  • the size of the PRB bundling may be set and used as 2 PRB. Since a resource block group (RBG) is 2 PRB, a URS pattern may be newly defined in 7 RB 2400 including the center 6 RBs 2420 .
  • RBG resource block group
  • the size of the PRB bundling is 3 RB.
  • RB#21, RB#22, and RB#23 are the same RBG
  • RB#27, RB#28, and RB#29 also belong to the same RBG.
  • a URS pattern different from the URS within the system bandwidth may be defined and transmitted.
  • the URS when the URS is transmitted to only some bands based on the center frequency in N bands, if N is an odd number, the URS is transmitted to all of y RBs (y is an odd number), and if N is an even number, the URS may be transmitted to all of z RBs (z is an even number).
  • y and z are integers which are smaller than or equal to N. That is, the number of RBs in which the URS is transmitted may be changed according to whether the system bandwidth is a frequency bandwidth corresponding to even-numbered or odd numbered RBs.
  • the RB in which the URS may be an RB which is newly indexed and defined.
  • information on whether the PRB bundling is supported may be signaled from the base station to the UE.
  • the UE may use demodulating the resource area where the URS is newly defined based on the information on whether the PRB bundling is supported.
  • the PRB bundling may be newly defined and used unlike another resource area.
  • the RBs may be divided by using newly defined PRB indexing in only the RB where the newly defined URS is transmitted.
  • FIG. 25 is a schematic diagram illustrating a PRB bundling method according to the exemplary embodiment of the present invention.
  • whether the PRB bundling is performed is determined to be signaled from the base station to the UE.
  • the PRB bundling When the PRB bundling is performed between the RB where the newly defined URS is transmitted and another RB, the PRB bundling should be performed like an existing method. However, if the PRB bundling is not permitted, two cases below may be assumed according to a method of indexing the RB.
  • FIG. 25(A) illustrates a case where the indexing for the RB is newly performed in RB#k 2500 to RB#k+6 2560 including the newly defined URS.
  • the PRB bundling size is 2 and the RB #k ⁇ 1 2570 and RB#k 2500 belong to the same RBG. Since the PRB bundling is not permitted, the PRB bundling is not performed with respect to the RB #k ⁇ 1 2570 and the RB#k 2500 . Accordingly, the UE may perform the demodulation on the assumption that the RB #k ⁇ 1 2570 and the RB#k 2500 are the RB to which different precodings are applied.
  • the UE ma perform the demodulation on the assumption that the RB#k 500 and the RB#k+1 2510 which are the RBs transmitting the newly defined URS are the RBs to which the same precoding is applied.
  • the same precoding is applied to the RB#k+2 2520 and RB#k+3 2530 and the same precoding is applied to the RB#k+4 2540 and RB#k+5 2550 .
  • FIG. 25(B) illustrates the case in which the indexing of the RB is performed in RB #k 2200 to RB #k+6 2250 including the newly defined URS similarly as the related art.
  • the size of the PRB bundling may be assumed as 2 and the case in which RB #k ⁇ 1 2570 - 1 and RB #k 2500 - 1 belong to the same RBG. Since the PRB bundling is not permitted, PRB bundling of RB #k ⁇ 1 2570 - 1 and RB #k 2500 - 1 is not performed. Accordingly, the UE may perform demodulation while assuming that RB #k ⁇ 1 2570 - 1 and RB #k 2500 - 1 are RBs to which different precodings are applied.
  • the UE may perform demodulation by assuming that RB #k+1 2510 - 1 and RB #k+2 2520 - 1 which are RBs transmitting the newly defined URS are RBs to which the same precoding is applied. In the same manner, the UE may assume that the same precoding is applied to RB #k+3 2530 - 1 and RB #k+4 2540 - 1 and the same precoding is applied to RB #k+5 2550 - 1 and RB #k+6 2560 - 1 .
  • the base station signals to the UE that PRB bundling of RB #k and RB #k+1 is not permitted and in the case where whether the same precoding is applied to RB #k+5 and RB #k+6, the RBs to which the same precoding is applied may be determined based on RB #k+5 and RB #k+6.
  • whether PRB bundling is performed in the corresponding subframe or a PRB having a predetermined frequency band is determined to be signaled to the UE from the base station.
  • FIG. 26 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention.
  • a base station 2500 includes a processor 2610 , a memory 2620 , and a radio frequency (RF) unit 2630 .
  • the memory 2620 is connected with the processor 2610 to store various information for driving the processor 2610 .
  • the RF unit 2630 is connected with the processor 2610 to transmit and/or receive a radio signal.
  • the processor 2610 implements a function, a process, and/or a method which are proposed. In the aforementioned embodiment, the operation of the base station may be implemented by the processor 2610 .
  • the processor 2610 may create a synchronization signal and create a URS so that the URS is transmitted to the UE through the center 6 RBs in at least one OFDM symbol among OFDM symbols other than an OFDM symbol in which the synchronization signal is transmitted.
  • a wireless device 2650 includes a processor 2660 , a memory 2670 , and an RF unit 2680 .
  • the memory 2670 is connected with the processor 2660 to store various information for driving the processor 2660 .
  • the RF unit 2680 is connected with the processor 2660 to transmit and/or receive a radio signal.
  • the processor 2660 implements a function, a process, and/or a method which are proposed. In the aforementioned embodiment, the operation of the wireless device may be implemented by the processor 2660 .
  • the processor 2660 may be implemented to receive the URS in at least one OFDM symbol among OFDM symbols other than an OFDM symbol in which a signal transmitted from the UE is transmitted.
  • the processor may include an application-specific integrated circuit (ASIC), another chip set, a logic circuit and/or a data processing apparatus.
  • the memory may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and/or other storage devices.
  • the RF unit may include a baseband circuit for processing the radio signal.
  • the exemplary embodiment is implemented by software, the aforementioned technique may be implemented by a module (a process, a function, and the like) performing the aforementioned function.
  • the module may be stored in the memory and executed by the processor.
  • the memory may be positioned inside or outside the processor and connected with the processor by various well-known means.

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