WO2010087646A2 - Procédé et appareil d'émission d'un signal de référence dans un système de radiocommunication - Google Patents

Procédé et appareil d'émission d'un signal de référence dans un système de radiocommunication Download PDF

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Publication number
WO2010087646A2
WO2010087646A2 PCT/KR2010/000555 KR2010000555W WO2010087646A2 WO 2010087646 A2 WO2010087646 A2 WO 2010087646A2 KR 2010000555 W KR2010000555 W KR 2010000555W WO 2010087646 A2 WO2010087646 A2 WO 2010087646A2
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subframe
advanced
antennas
reference signals
reference signal
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PCT/KR2010/000555
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English (en)
Korean (ko)
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WO2010087646A3 (fr
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정재훈
이문일
고현수
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엘지전자주식회사
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Publication of WO2010087646A2 publication Critical patent/WO2010087646A2/fr
Publication of WO2010087646A3 publication Critical patent/WO2010087646A3/fr

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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting a reference signal in a wireless communication system.
  • the next generation multimedia wireless communication system which is being actively researched recently, requires a system capable of processing and transmitting various information such as video, wireless data, etc., out of an initial voice-oriented service.
  • the purpose of a wireless communication system is to enable a large number of users to communicate reliably regardless of location and mobility.
  • a wireless channel is a Doppler due to path loss, noise, fading due to multipath, intersymbol interference (ISI), or mobility of UE.
  • ISI intersymbol interference
  • There are non-ideal characteristics such as the Doppler effect.
  • Various techniques have been developed to overcome the non-ideal characteristics of the wireless channel and to improve the reliability of the wireless communication.
  • MIMO multiple input multiple output
  • MIMO techniques include spatial multiplexing, transmit diversity, beamforming, and the like.
  • the MIMO channel matrix according to the number of receive antennas and the number of transmit antennas may be decomposed into a plurality of independent channels. Each independent channel is called a layer or stream. The number of layers is called rank.
  • a signal known to both a transmitter and a receiver is required for channel state measurement and data demodulation.
  • a signal known to both the transmitter and the receiver is called a reference signal (RS).
  • the reference signal may also be called a pilot.
  • the receiver may measure a channel quality indicator (CQI) through a reference signal and feed back the CQI to the transmitter.
  • CQI channel quality indicator
  • the receiver may estimate a channel between the transmitter and the receiver through a reference signal and demodulate data using the estimated channel.
  • the reference signal Since the signal transmitted from the transmitter undergoes a corresponding channel for each transmission antenna or layer, the reference signal may be allocated for each transmission antenna or layer. Reference signals for each transmission antenna or layer may be distinguished by using resources such as time, frequency, and code. When there are a plurality of transmit antennas, the reference signal overhead can be greatly increased.
  • the reference signal overhead may be defined as the ratio of resources used for transmitting the reference signal with respect to all resources. If the reference signal overhead is large, channel estimation performance can be improved and reliability of wireless communication can be improved. However, if the reference signal overhead is large, there is a problem of reducing the resources that can actually transmit data. This reduces data throughput and lowers spectral efficiency. This can degrade the performance of the entire system.
  • the number of transmit antennas used in the existing wireless communication system may be up to four.
  • a reference signal in a new wireless communication system (hereinafter, advanced system) that uses the number of transmit antennas to eight, for example, it is designed to support legacy user equipment operating in a legacy system. It is preferable. That is, it is desirable to support backward compatibility with legacy terminals.
  • the legacy terminal recognizes the reference signal as data. Accordingly, the legacy terminal attempts to demodulate data with respect to the reference signal, and as a result, may degrade the data demodulation performance of the legacy terminal.
  • An object of the present invention is to provide a method and apparatus for transmitting a reference signal in a wireless communication system.
  • a reference signal transmission method performed by a transmitter in a wireless communication system includes allocating M reference signals for M antennas (where M is a natural number) in an advanced subframe; And transmitting the M reference signals, wherein the M reference signals are partially located at the same position as the resource element in which N reference signals for N antennas (N is a natural number) are arranged in a legacy subframe. Assigned to a resource element, M is greater than N.
  • An apparatus for wireless communication includes a radio frequency (RF) unit for transmitting and / or receiving a radio signal; And a processor connected to the RF unit to allocate M reference signals for M antennas (M is a natural number) and transmit the M reference signals in an advanced subframe, wherein the M reference signals include: In the legacy subframe, N (N is a natural number) N reference signals for the antennas are allocated to some resource elements at the same position as the resource element where the arrangement is, and M is greater than N.
  • RF radio frequency
  • FIG. 1 is a block diagram illustrating a wireless communication system.
  • 3 is an exemplary diagram illustrating a resource grid for one downlink slot.
  • FIG. 4 shows an example of a structure of a radio frame and a downlink subframe.
  • 5 shows an example of a structure of a downlink subframe.
  • FIG. 6 is a block diagram illustrating an example of a transmitter structure.
  • FIG. 7 illustrates an example of reference signal mapping for one antenna in the case of a normal CP.
  • FIG. 8 illustrates an example of reference signal mapping for two antennas in the case of a normal CP.
  • FIG 9 illustrates an example of reference signal mapping for four antennas in the case of a normal CP.
  • FIG. 10 illustrates an example of reference signal mapping for one antenna in case of an extended CP.
  • FIG. 11 illustrates an example of reference signal mapping for two antennas in case of an extended CP.
  • 16 is a flowchart illustrating a reference signal transmission method performed by a transmitter according to an embodiment of the present invention.
  • 17 shows examples of legacy subframes and advanced subframes.
  • 19 shows another example of RS mapping in an advanced subframe.
  • FIG. 20 illustrates an example of reference signal mapping in a legacy subframe in the case of a normal CP.
  • 21 illustrates an example of reference signal mapping in a legacy subframe in case of an extended CP.
  • FIG. 22 shows a first example of reference signal mapping in an advanced subframe in case of a normal CP.
  • FIG. 23 shows a second example of RS mapping in an advanced subframe in case of a normal CP.
  • FIG. 24 illustrates a first example of RS mapping in an advanced subframe in case of an extended CP.
  • FIG. 25 illustrates a second example of RS mapping in an advanced subframe in case of an extended CP.
  • FIG. 26 shows a third example of RS mapping in an advanced subframe in case of a normal CP.
  • FIG. 27 illustrates a fourth example of RS mapping in an advanced subframe in case of a normal CP.
  • FIG. 28 shows a third example of RS mapping in an advanced subframe in case of an extended CP.
  • 29 shows a fourth example of RS mapping in an advanced subframe in case of an extended CP.
  • FIG. 30 illustrates a fifth example of RS mapping in an advanced subframe in case of a normal CP.
  • 31 illustrates a sixth example of RS mapping in an advanced subframe in case of a normal CP.
  • 32 illustrates a fifth example of RS mapping in an advanced subframe in case of an extended CP.
  • 33 is a sixth diagram of RS mapping in an advanced subframe in case of an extended CP.
  • 35 shows another example of an advanced subframe structure in the case of a normal CP.
  • 36 is a block diagram illustrating an apparatus for wireless communication, in which an embodiment of the present invention is implemented.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A Advanced
  • 3GPP LTE Advanced
  • FIG. 1 is a block diagram illustrating a wireless communication system.
  • the wireless communication system 10 includes at least one base station 11 (BS).
  • Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • a user equipment (UE) 12 may be fixed or mobile, and may include a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), It may be called other terms such as a wireless modem and a handheld device.
  • the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like. have.
  • downlink means communication from the base station to the terminal
  • uplink means communication from the terminal to the base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal, and a receiver may be part of a base station.
  • the wireless communication system can support multiple antennas.
  • the transmitter may use a plurality of transmit antennas (Tx antennas), and the receiver may use a plurality of receive antennas (Rx antennas).
  • a transmit antenna refers to a physical or logical antenna used to transmit one signal or stream
  • a receive antenna refers to a physical or logical antenna used to receive one signal or stream. If the transmitter and receiver use multiple antennas, the wireless communication system may be called a multiple input multiple output (MIMO) system.
  • MIMO multiple input multiple output
  • a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered with slots # 0 through # 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI may be referred to as a scheduling unit for data transmission. For example, one radio frame may have a length of 10 ms, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • 3 is an exemplary diagram illustrating a resource grid for one downlink slot.
  • a downlink slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and an N (DL) resource block (RB) in a frequency domain. It includes.
  • the OFDM symbol is used to represent one symbol period, and may be called another name such as an OFDMA symbol or an SC-FDMA symbol according to a multiple access scheme.
  • the number N (DL) of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell. In 3GPP LTE, N (DL) may be any one of 6 to 110.
  • One resource block includes a plurality of subcarriers in the frequency domain.
  • Each element on the resource grid is called a resource element (RE).
  • an example of one resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of OFDM symbols and the number of subcarriers in the resource block is equal to this. It is not limited.
  • the number of OFDM symbols may vary depending on the length of a cyclic prefix (CP) and subcarrier spacing. For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP.
  • the resource grid for the downlink slot illustrated in FIG. 3 may also be applied to the resource grid for the uplink slot.
  • FIG. 4 shows an example of a structure of a radio frame and a downlink subframe.
  • a radio frame includes 10 subframes, and the subframe includes two consecutive slots. Subframes within a radio frame are numbered from 0 to 9 subframes. In the case of a normal CP, a subframe includes 14 OFDM symbols. In the case of an extended CP, a subframe includes 12 OFDM symbols.
  • a synchronization channel may be transmitted for every radio frame.
  • the synchronization channel is a channel for cell search.
  • the cell search is a process in which the UE acquires time synchronization and frequency synchronization with a cell and detects a cell ID of the cell.
  • the synchronization channel includes a primary-SCH (P-SCH) and a secondary-SCH (S-SCH).
  • a primary synchronization signal (PSS) is transmitted through the P-SCH
  • a secondary synchronization signal (SSS) is transmitted through the S-SCH.
  • the P-SCH may be transmitted through the last OFDM symbol of the first slot (slot numbers # 1, # 10) of subframes having subframe numbers 0 and 5 in the radio frame.
  • an OFDM symbol having an OFDM symbol index of 6 is an OFDM symbol
  • an OFDM symbol having an OFDM symbol index of 5 is an OFDM symbol.
  • the S-SCH may be transmitted on an OFDM symbol immediately before the OFDM symbol on which the P-SCH is transmitted.
  • PBCH physical broadcast channel
  • SI system information
  • System information is essential information that the terminal needs to know in order to communicate with the base station.
  • System information transmitted on the PBCH includes the most essential and most frequently transmitted parameters. The parameters are needed to obtain other information from the cell. Examples of the parameter may include a downlink transmission bandwidth, a system frame number (SFN), which is a radio frame number.
  • SFN system frame number
  • the UE needs to receive system information on the PBCH in order to know the number N (DL) of resource blocks included in the downlink slot in the frequency domain.
  • the base station may transmit system information on 6 resource blocks (6 RB) in the frequency domain.
  • System information is transmitted during four consecutive radio frames.
  • the system information is an OFDM symbol having an OFDM symbol index l (L) of 0 to 3 in a second slot (slot number # 1) of a subframe having a subframe number of 0 in each radio frame.
  • This is merely an example and does not limit an area to which a PBCH is allocated in a radio frame.
  • 5 shows an example of a structure of a downlink subframe.
  • the downlink subframe includes two consecutive slots.
  • the preceding three OFDM symbols of the first slot in the downlink subframe are the control region, and the remaining OFDM symbols are the data region.
  • the control region includes 3 OFDM symbols.
  • a downlink subframe may be classified into a unicast subframe and a multimedia broadcast multicast service single frequency network (MBSFN) subframe.
  • Unicast subframe is a subframe for supporting point-to-point communication.
  • the MBSFN subframe is a subframe for supporting a multimedia broadcast and multicast service (MBMS).
  • MBMS multimedia broadcast and multicast service
  • a time-synchronized common waveform is transmitted from multiple cells. MBSFN transmission seems to be a transmission from a single large cell to the terminal.
  • MBMS is a point-to-multipoint service where data is sent from one transmitter to multiple receivers.
  • the control region may consist of 4 OFDM symbols or less, and in the MBSFN subframe, the control region may consist of 2 OFDM symbols or less.
  • a physical downlink shared channel may be allocated to the data region in the unicast subframe. Downlink data may be transmitted on the PDSCH.
  • a physical multicast channel may be allocated to the data region in the MBSFN subframe.
  • MBMS data may be transmitted on the PMCH.
  • the MBSFN subframe may be transmitted on a carrier that supports both PMCH and PDSCH. Alternatively, the MBSFN subframe may be transmitted on a carrier that does not support PDSCH.
  • control channels such as a physical control format indicator channel (PCFICH), a physical automatic repeat request (HICH) indicator channel (PHICH), and a physical downlink control channel (PDCCH) may be allocated.
  • PCFICH physical control format indicator channel
  • HICH physical automatic repeat request indicator channel
  • PDCCH physical downlink control channel
  • the PHICH carries HARQ acknowledgment (NACK) / negative acknowledgment (NACK) for uplink data.
  • the PCFICH carries information on the number of OFDM symbols used for transmission of PDCCHs in a subframe to the UE.
  • the number of OFDM symbols used for PDCCH transmission may be changed every subframe.
  • the number of OFDM symbols used for PDCCH transmission in the unicast subframe may be one of 1, 2, and 3. If the downlink transmission bandwidth is smaller than a specific threshold, the number of OFDM symbols used for PDCCH transmission in a unicast subframe may be one of 2, 3, and 4.
  • up to two OFDM symbols of the first slot in the MBSFN subframe may be reserved for non-MBSFN transmission.
  • the PDCCH carries downlink control information.
  • the downlink control information includes downlink scheduling information, uplink scheduling information, or an uplink power control command.
  • the downlink scheduling information is also called a downlink grant, and the uplink scheduling information is also called an uplink grant.
  • the transmitter may be part of the terminal or the base station.
  • the transmitter 100 includes a reference signal generator 110, a data processor 120, and Nt resource element mappers 130-1,..., 130. -Nt), Nt OFDM signal generators (140-1, ..., 140-Nt) and Nt antennas 190-1, ..., 190-Nt (Nt is a natural number). ).
  • Each of the Nt resource element mappers 130-1,..., 130 -Nt is connected to each of the Nt OFDM signal generators 140-1,..., 140 -Nt, and each of the Nt OFDM signal generators 140.
  • the reference signal generator 110 is connected to Nt resource element mappers 130-1,..., 130 -Nt to generate a reference signal sequence corresponding to the reference signal.
  • the reference signal sequence is composed of a plurality of reference symbols.
  • any sequence may be used without particular limitation.
  • the data processor 120 is connected to the Nt resource element mappers 130-1,..., 130 -Nt, and is configured to process data to generate data symbols.
  • the data processor 120 is configured to generate a bit stream corresponding to data, generate a codeword by performing channel coding on the bit stream, and modulate-mapped the codeword to generate data symbols. Can be. Codewords may be plural.
  • the data processor 120 may be configured to further perform layer mapping, precoding, etc. according to a transmission scheme. For example, transmission schemes include single antenna schemes, transmit diversity schemes, large delay cyclic delay diversity schemes, and closed-loop spatial multiplexing. ) And multiple user-MIMO (MU-MIMO) techniques.
  • MU-MIMO multiple user-MIMO
  • Each of the Nt resource element mappers 130-1,..., 130 -Nt is configured to map data symbols and reference symbols to resource elements that are time-frequency resources. One data symbol or one reference symbol may be mapped to one resource element. The resource element to which the reference symbol is mapped is called a reference resource element.
  • Each of the Nt OFDM signal generators 140-1, ..., 140-Nt are configured to generate a time-continuous OFDM signal.
  • Each of the Nt OFDM signal generators 140-1,..., 140 -Nt may generate an OFDM signal through inverse fast Fourier transform (IFFT), CP insertion, or the like.
  • IFFT inverse fast Fourier transform
  • CP insertion or the like.
  • Each OFDM signal is transmitted through each of the Nt antennas 190-1, ..., 190-Nt.
  • Reference signals include cell-specific reference signals and MBSFN reference signals.
  • the cell specific reference signal is a reference signal associated with non-MBSFN transmission
  • the MBSFN reference signal is a reference signal associated with MBSFN transmission.
  • the cell specific reference signal may be transmitted through all downlink subframes in a cell supporting non-MBSFN transmission. Only the first 2 OFDM symbols in the MBSFN subframe may be used for cell specific reference signal transmission.
  • the cell specific reference signal may be transmitted on one or several antennas. In 3GPP LTE, cell specific reference signals are defined only for subcarrier spacing 15 kHz (kilohertz).
  • Equation 1 shows an example of a reference signal sequence r (m).
  • N (max, DL) is the number of resource blocks corresponding to the maximum bandwidth supported in the wireless communication system.
  • N (max, DL) is 110 in 3GPP LTE.
  • the subframe has a bandwidth smaller than N (max, DL)
  • only a portion of the reference signal sequence generated at 2 ⁇ N (max, DL) length can be selected and used.
  • c (i) is a pseudo-random (PN) sequence.
  • the PN sequence may be defined by a Gold sequence of length-31. Equation 2 below shows an example of a 2 ⁇ N (max, DL) length sequence c (i).
  • x (i) is the first m-sequence and y (i) is the second m-sequence.
  • the second m-sequence may be initialized for every OFDM symbol according to a cell ID, a slot number in a radio frame, an OFDM symbol index in a slot, a type of CP, and the like.
  • Equation 3 is an example of initialization of the second m-sequence.
  • n (s) is a slot number in a radio frame
  • l is an OFDM symbol index in a slot
  • N (cell_ID) is a cell ID.
  • N (CP) is 1
  • CP is 0.
  • the reference signal sequence r (m) may be mapped to a complex value a (k, l, p) used as a reference symbol for an antenna p.
  • k is a slot subcarrier index
  • l is a slot OFDM symbol index.
  • a (k, l.p) corresponds to the resource element (k.l) on antenna p.
  • Equation 4 shows an example in which the reference signal sequence r (m) is mapped to a complex a (k, l, p).
  • N (symb) is the number of OFDM symbols in the slot
  • N (DL) is the number of resource blocks in the slot.
  • Variables v and v (shift) define the position in the frequency domain for other reference signals. Equation 5 below shows examples of the variables v and v (shift).
  • the resource element (k, l) used for transmitting a reference signal through an antenna in a slot is not used for any transmission through another antenna in the same slot. If the resource element (k, l) on antenna p is not used for any transmission, the complex number a (k, l, p) corresponding to the resource element (k, l) on antenna p may be set to zero. .
  • FIG. 7 illustrates an example of reference signal mapping for one antenna in the case of a normal CP.
  • 8 illustrates an example of reference signal mapping for two antennas in the case of a normal CP.
  • 9 illustrates an example of reference signal mapping for four antennas in the case of a normal CP.
  • 10 illustrates an example of reference signal mapping for one antenna in case of an extended CP.
  • 11 illustrates an example of reference signal mapping for two antennas in case of an extended CP.
  • 12 shows an example of reference signal mapping for four antennas in the case of an extended CP.
  • the reference resource element is a resource element used for transmitting a reference signal.
  • the reference signal corresponds to the set of reference resource elements. Resource elements other than the reference resource element may be used for data transmission. Resource elements used for data transmission are called data resource elements. Reference symbols constituting the reference signal are mapped to the reference resource element, and data symbols constituting the data are mapped to the data resource element.
  • the MBSFN reference signal is transmitted only within a subframe allocated for MBSFN transmission. That is, the MBSFN reference signal is transmitted only through the MBSFN subframe.
  • the MBSFN reference signal is defined only for the extended CP.
  • Rm denotes a resource element used for MBSFN reference signal transmission through antenna m. It is assumed that the MBSFN reference signal is transmitted on antenna m. In one OFDM symbol, Rm is located at two subcarrier intervals.
  • One resource unit is defined as one subframe in the time domain and one resource block in the frequency domain. It is assumed that one resource block includes 12 subcarriers in the frequency domain. In the case of a normal CP, it is assumed that one subframe includes 14 OFDM symbols in the time domain, and in case of an extended CP, one subframe includes 12 OFDM symbols in the time domain.
  • the resource element on the resource unit may be identified by the OFDM symbol number in the subframe and the subcarrier number (0, 1, ..., 11) in the resource block. In case of a normal CP, the OFDM symbol numbers are 0,1, ..., 13, and in case of an extended CP, the OFDM symbol numbers are 0,1, ..., 11.
  • a unicast subframe may include a control region to which a PDCCH is allocated and a data region to which a PDSCH is allocated. Control information and cell specific reference signals may be transmitted in the control region within the unicast subframe. Unicast data and cell specific reference signals may be transmitted in the data region within the unicast subframe.
  • an MBSFN subframe may include a control region to which a PDCCH is allocated and a data region to which a PMCH is allocated. Control information and cell specific reference signals may be transmitted in the control region within the MBSFN subframe. In the data area within the MBSFN subframe, the MBSFN data and the MBSFN reference signal may be transmitted.
  • the UE For unicast communication, the UE periodically measures a channel quality indicator (CQI) through a cell specific reference signal.
  • CQI channel quality indicator
  • the UE measures the CQI using a channel estimated through a cell-specific reference signal transmitted over the entire unicast subframe including the control region and the data region.
  • the UE should avoid a process of acquiring the CQI for unicast communication.
  • the UE can acquire the CQI only through the cell specific reference signal transmitted through the control region of the MBSFN subframe.
  • FIGS. 14 and 15 show reference resource elements for all antennas on the same resource unit for convenience.
  • the legacy system may support up to 4 antennas for downlink transmission.
  • more than 5 antennas may be supported for downlink transmission.
  • the advanced systems maintain backward compatibility with legacy systems.
  • the compatibility between advanced and legacy systems is convenient for the user, and the operator can also reuse existing equipment.
  • 3GPP LTE is a legacy system
  • LTE-A is an advanced system.
  • a terminal of a legacy system is called a legacy UE
  • a terminal of an advanced system is called UE-A (UE-advanced, UE-A). If referred to only as a terminal, it includes both the legacy terminal and the terminal-A.
  • the legacy terminal When a newly designed reference signal for an extended antenna in an advanced system is transmitted through a resource element used for data transmission in a legacy system, the legacy terminal recognizes the reference signal of the extended antenna as data and attempts to demodulate the data. Can be. This may cause serious deterioration in data reception of the legacy terminal. Therefore, when designing a reference signal for an extended antenna in an advanced system, it should be designed in a direction that does not affect data reception of the legacy terminal.
  • advanced systems may be designed to support legacy terminals.
  • Legacy terminals do not have information about advanced systems.
  • the frame of the advanced system may be designed by inheriting the cell-specific reference signal of the legacy system, the MBSFN subframe, the control region to which the PDCCH is transmitted, the position of the PBCH and the position of the SCH.
  • a subframe of a legacy system is called a legacy subframe
  • a subframe of an advanced system is called an advanced subframe.
  • 16 is a flowchart illustrating a reference signal transmission method performed by a transmitter according to an embodiment of the present invention.
  • the transmitter may be part of the base station.
  • the transmitter transmits N first reference signals through N antennas (N is a natural number) in a legacy subframe (S110).
  • the transmitter transmits M second reference signals through M antennas (where M is a natural number) in the advanced subframe (S120). At this time, M is larger than N.
  • the transmitter may transmit data to the legacy terminal in the legacy subframe.
  • the transmitter does not transmit data to the legacy terminal in the advanced subframe.
  • At least one of the M second reference signals may be transmitted through the resource element at the same position on the basis of the N frames and the subframes.
  • 17 shows examples of legacy subframes and advanced subframes.
  • an advanced subframe may be continued to a legacy subframe.
  • Advanced Subframe The previous subframe and the advanced subframe subsequent subframes may both be legacy subframes.
  • a subframe having a subframe number of 6 in the radio frame is represented as an advanced subframe, but this is only an example. The number, location, etc. of advanced subframes within a radio frame may vary.
  • the transmission time of the advanced subframe may be variously set. However, it is desirable for the compatibility with legacy systems not to use a subframe in which PBCH and / or SCH is transmitted as an advanced subframe.
  • the advanced subframe transmission timing may be fixed.
  • a subframe whose subframe number is 6 in a radio frame may be an advanced subframe.
  • the base station may only signal the legacy terminal once for the advanced subframe.
  • the advanced subframe may be transmitted periodically.
  • the base station can inform the user equipment of the transmission period and offset of the advanced subframe.
  • a transmission time of an advanced subframe may be set semi-statically.
  • a transmission time of an advanced subframe may be set through higher layer signaling of a physical layer.
  • the upper layer may be RRC (radio resource control) for controlling radio resources between the terminal and the network.
  • RRC radio resource control
  • a bitmap scheme may be used for signaling indicating an advanced subframe. For example, when a subframe having a subframe number of 6 is set as an advanced subframe in a radio frame including 10 subframes, the bitmap may be expressed as '0000001000'.
  • the base station may configure the advanced subframe in a manner that does not schedule downlink transmission for the legacy terminal in the advanced subframe.
  • an advanced subframe may be composed of a control region and an advanced data region.
  • the advanced data area is the data area of the advanced subframe.
  • the same cell specific reference signal as that of the legacy system is transmitted.
  • a reference signal for an extended antenna is transmitted.
  • Re is a resource element used for transmitting a reference signal through an extended antenna.
  • Re is disposed at the same position on the basis of the subframe and the reference resource element of the legacy subframe.
  • this is only an example and does not limit the position in the subframe of the reference resource element for the extended antenna.
  • the reference signal structure of the advanced subframe may be designed in consideration of the control region.
  • a control channel may be allocated to the preceding maximum 3 OFDM symbols of the first slot in the downlink subframe.
  • one, two, or three OFDM symbols in the downlink subframe become control regions.
  • the reference signal structure in the control region of the advanced subframe may be set to be the same as the legacy subframe. That is, in the control region of the advanced subframe, a reference signal for the same antenna as the legacy subframe may be transmitted through the reference resource element at the same position on the basis of the legacy subframe and the subframe.
  • the reference signal structure in the control region of the advanced subframe may be set differently from the legacy subframe.
  • the reference signal structure of the advanced subframe may be designed in consideration of the accessibility of the legacy UE to the advanced subframe.
  • legacy terminals may not have access to advanced subframes.
  • the reference signal structure of the advanced subframe has no effect on the legacy terminal.
  • the reference signal structure of the advanced subframe can be freely designed.
  • the legacy terminal may access the control region of the advanced subframe, but may not access the advanced data region.
  • the reference signal structure of the control region of the advanced subframe is set to be the same as the control region of the legacy subframe, and the reference signal structure of the advanced data region can be freely designed.
  • the legacy terminal can measure the CQI through the reference signal only in the control region of the advanced subframe. For example, it may be a reference signal structure of an advanced subframe as shown in FIG. 18.
  • the advanced subframe may reuse the MBSFN subframe. That is, the MBSFN subframe is reused in an advanced subframe for unicast transmission through an extended antenna.
  • the MBSFN subframe may be configured by higher layer signaling such as RRC. Higher layer signaling for indicating an MBSFN subframe may be reused as signaling for indicating an advanced subframe.
  • the legacy terminal can recognize the transmission time of the advanced subframe through the signaling.
  • the legacy terminal may be accessible to both the control region and the advanced data region of the advanced subframe.
  • the base station does not schedule downlink transmission for the legacy terminal in the advanced subframe.
  • the legacy terminal may measure the CQI in the advanced subframe.
  • the reference signal structure of the legacy subframe is maintained in the advanced subframe, and a reference resource element for an extended antenna in the advanced data region may be additionally arranged. Since the legacy terminal does not receive downlink data in the advanced subframe, the reference resource element for the extended antenna in the advanced data region has no effect on the legacy terminal.
  • 19 shows another example of RS mapping in an advanced subframe.
  • Re is a reference resource element for an extended antenna.
  • UE-A may receive downlink data through an extended antenna in an advanced subframe.
  • the legacy terminal does not receive downlink data in the advanced subframe, but estimates a channel for each of antennas 0 to 3 through reference signals transmitted through R0 to R3 in the advanced subframe, and CQI. Can be measured.
  • the base station may configure the advanced subframe in such a manner that the downlink transmission for the legacy terminal is not scheduled in the advanced subframe.
  • the base station does not transmit the PDCCH for the legacy terminal in the control region of the advanced subframe. Since the legacy terminal does not detect the PDCCH, the legacy terminal does not receive downlink data in the advanced data area. In this case, the base station may not inform the legacy terminal of the advanced subframe transmission time.
  • P shown in the drawings is only an example, and p may be changed in the drawings.
  • R4 can be changed to R5 and R6 can be changed to R7.
  • the reference resource element in the resource unit may transition to the frequency domain and / or the time domain.
  • the reference resource element in the resource unit may be shifted by m-subcarriers (m is a natural number).
  • the reference resource element in the resource unit may be shifted by n-OFDM symbols (n is a natural number).
  • 20 illustrates an example of reference signal mapping in a legacy subframe in the case of a normal CP.
  • 21 illustrates an example of reference signal mapping in a legacy subframe in case of an extended CP.
  • the reference resource element is located in an OFDM symbol having symbol numbers 0, 1, 4, 7, 8, and 11.
  • a reference resource element is located in an OFDM symbol having symbol numbers 0, 1, 3, 6, 7, and 9.
  • R0 and R1 are eight in one resource unit, and R2 and R3 are four in each.
  • the resource element at the same position on the basis of the subframe and the reference resource element in the legacy subframe may be used as the reference resource element of the extended antenna.
  • the extended antenna may be antennas 0 to 7.
  • OFDM symbols having a symbol number of 0 and 1 in the advanced subframe are control regions, and the remaining OFDM symbols are advanced data regions.
  • FIG. 22 shows a first example of reference signal mapping in an advanced subframe in case of a normal CP.
  • OFDM symbols with symbol numbers 2 through 13 are advanced data regions.
  • resource elements of the same position on the subframe basis with reference resource elements R0 to R3 in the data area of the legacy subframe are used for transmitting the reference signals for the antennas 4 to 7. That is, R0 to R3 in the data region of the legacy subframe are simply converted to R4 to R7 in the advanced subframe. For example, R0 of the legacy subframe is converted to R4 in the advanced data area. Similarly, R1 is converted to R5, R2 to R6, and R3 to R7. This one-to-one conversion can be various other examples.
  • the receiver may demodulate the data by estimating a channel from reference signals for antennas 0-7.
  • R0 to R3 in the advanced subframe are located only in the OFDM symbol whose symbol number is 0,1.
  • channel estimation performance may be degraded. If the channel estimation performance is poor, the reliability of the wireless communication is lowered.
  • the reference signal transmitted in the subframe subsequent to the advanced subframe may be used to overcome the time selective characteristic of the channel.
  • Coherent time is inversely proportional to Doppler spread. The coherent time may be used to determine whether the channel is a time selective channel or a time flat channel.
  • FIG. 23 shows a second example of RS mapping in an advanced subframe in case of a normal CP.
  • R0 of the legacy subframe is converted to R5 in the advanced data area.
  • R1 is converted to R4, R2 to R6, and R3 to R7.
  • FIG. 23 shows that R4 and R5 of FIG. 22 are changed from each other.
  • R0 to R3 in the data region of the legacy subframe may be variously converted to R4 to R7 in the advanced subframe.
  • FIG. 24 illustrates a first example of RS mapping in an advanced subframe in case of an extended CP.
  • FIG. 25 illustrates a second example of RS mapping in an advanced subframe in case of an extended CP. In this manner, the case of the normal CP may be equally applied to the extended CP.
  • the number of each of R0 to R3 in the advanced subframe is two, the number of each of R4 and R5 is six, and the number of each of R6 and R7 is two. That is, as shown in FIGS. 22 to 25, when simply converting R0 to R3 in the data region of the legacy subframe from R4 to R7 in the advanced subframe, the channel estimation performance for each antenna is not equal.
  • Channel estimation performance is related to the reference signal density. If an equal number of reference resource elements are arranged for each antenna in the subframe, channel estimation performance for each antenna may be equalized.
  • the number of OFDM symbols including reference resource elements for any two antennas in the advanced subframe and the number of OFDM symbols including reference resource elements for the remaining two antennas are the same. Can be arranged to
  • each OFDM symbol including R4 to R7 will be described as an example.
  • reference resource elements for two antennas are arranged.
  • FIG. 26 shows a third example of RS mapping in an advanced subframe in case of a normal CP.
  • R4 and R5 are located in OFDM symbols having symbol numbers 4 and 8
  • R7 and R8 are located in OFDM symbols having symbol numbers 7, 11.
  • the first OFDM symbol of the two OFDM symbols including R4 and R5 is always located before the first OFDM symbol of the two OFDM symbols including R6 and R7.
  • the second OFDM symbol of the two OFDM symbols including R4 and R5 is also always located before the second OFDM symbol of the two OFDM symbols including R6 and R7.
  • Each Rp is located at 6 subcarrier intervals within one OFDM symbol.
  • Reference resource elements of different antennas in one OFDM symbol are located at three subcarrier intervals.
  • R4 and R5 maintain three subcarrier spacings
  • R6 and R7 also maintain three subcarrier spacings.
  • FIG. 27 illustrates a fourth example of RS mapping in an advanced subframe in case of a normal CP.
  • FIG. 27 is a diagram in which R4 and R5 of FIG. 26 are changed from each other. 27 is only an example, and R6 and R7 of FIG. 26 may also be changed from each other.
  • FIG. 28 shows a third example of RS mapping in an advanced subframe in case of an extended CP.
  • 29 shows a fourth example of RS mapping in an advanced subframe in case of an extended CP.
  • R4 and R5 are located in OFDM symbols having symbol numbers 3 and 7
  • R6 and R7 are located in OFDM symbols having 6 and 9 symbol numbers. Except for this, the example of the normal CP of FIGS. 26 and 27 is applied as it is. In this manner, the case of the normal CP may be equally applied to the extended CP.
  • 26 to 29 are exemplary only and do not limit the positions of R4 to R7 in advanced subframes. If the reference resource element for any two antennas of R4 to R7 is arranged in the OFDM symbol including the reference resource element, the reference resource element for the other two antennas is arranged in another OFDM symbol. When there are two OFDM symbols including reference resource elements for any two antennas, the positions of the frequency domains of the reference resource elements for each antenna in the first OFDM symbol and the second OFDM symbol may be exchanged with each other.
  • the following table shows symbol numbers of OFDM symbols including reference resource elements for the extended antenna in the advanced subframe. 4 OFDM symbols including reference resource elements for the extended antenna.
  • Rx, Ry, Rz and Rw in Table 1 may be optionally designated with one of R4 to R7.
  • Rx may be designated as R4, Ry as R5, Rz as R6, and Rw as R7.
  • a subframe including an OFDM symbol using a normal CP includes 14 OFDM symbols and may configure a data region with OFDM symbols having a symbol number of 3 to 13.
  • a subframe including an OFDM symbol using an extended CP includes 12 OFDM symbols and may configure a data region with OFDM symbols having a symbol number of 2 to 11.
  • the numbers shown in the table indicate the symbol numbers of the OFDM symbols in the subframe.
  • FIG. 30 shows a fifth example of RS mapping in an advanced subframe in case of normal CP.
  • R0 and R1 are located in an OFDM symbol with a symbol number of seven
  • R2 and R3 are located in an OFDM symbol with a symbol number of eight
  • R4 and R5 are OFDM with a symbol number of four.
  • Located in the symbol, R6 and R7 is located in the OFDM symbol with the symbol number 11. That is, the reference resource element for the antenna port pair consisting of antenna 0 and antenna 1 is placed in symbol number 7, and the reference resource element for the antenna port pair consisting of antenna 2 and antenna 3 is symbol number 8 Is placed on.
  • the reference resource element for antenna port pair consisting of antenna 4 and antenna 5 is placed in symbol number 4.
  • the reference resource element for antenna port pair consisting of antenna 6 and antenna 7 is placed in symbol number 11. do.
  • each of R0 to R7 is disposed so that the reference signal density is equal.
  • 31 illustrates a sixth example of RS mapping in an advanced subframe in case of normal CP.
  • Each antenna port pair described above with reference to FIGS. 30 and 31 ie, antenna 0 and antenna 1, antenna 2 and antenna 3, antenna 4 and antenna 5, antenna 6 and antenna 7
  • the symbol number of the OFDM symbol in which the reference resource element is disposed may be represented as ⁇ 7, 8, 4, 11 ⁇ for convenience.
  • the symbol number for each antenna port pair can be variously modified as shown in Table 2 below.
  • Examples of reference signal mapping for the normal CP described with reference to FIGS. 30 and 31 may also be applied to the extended CP.
  • 32 shows a fifth example of RS mapping in an advanced subframe in case of an extended CP.
  • 33 shows a sixth example of RS mapping in an advanced subframe in case of an extended CP.
  • R0 and R1 are located in OFDM symbol with symbol number 6
  • R2 and R3 are located in OFDM symbol with symbol number 7, and R4 and R5 are symbol number 3
  • R6 and R7 are located in the OFDM symbol with the symbol number 9.
  • the example of the normal CP of FIGS. 30 and 31 is applied as it is.
  • the extended CP may be applied in the same manner as in the case of the normal CP.
  • Reference resource elements of different antennas in one OFDM symbol are located at three subcarrier intervals.
  • FIG. 33 differs from FIG. 32 in that positions R0 and R1, R2 and R3, R4 and R5, and R6 and R7 are exchanged.
  • the channel estimation performance of each of antennas 0 to 7 may be equal.
  • antennas included in the antenna port pair have consecutive antenna numbers in the embodiments described with reference to FIGS. 30 to 33, this is not a limitation. That is, two antennas arbitrarily selected from antennas 0 to 7 may configure an antenna port pair.
  • antenna 0 and antenna 7 may constitute one antenna port pair
  • antenna 1 and antenna 6 may constitute another antenna port pair.
  • the reference signal structure of the advanced system described so far may be arranged throughout the downlink transmission bandwidth.
  • the reference signal structure of the advanced system may be arranged limited to some frequency period of the downlink transmission bandwidth.
  • reference resource elements of each of antennas 0 to 3 are disposed throughout the downlink transmission bandwidth, and reference resource elements of each of antennas 4 to 7 are arranged only in some frequency intervals of the downlink transmission bandwidth. Can be.
  • an advanced subframe is divided into a control region and an advanced data region in the time domain, and includes a special region for an extended antenna (hereinafter, referred to as a special region) in the advanced data region.
  • the special region is in the form of time division multiplexing (TDM) with the control region in the time domain and the frequency division multiplexing (FDM) in the frequency domain within the advanced subframe.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • the special region may include at least one or more subcarriers or at least one or more resource blocks in the frequency domain.
  • the special region may include a frequency band divided by one carrier when viewed in the frequency domain, or may correspond to a component carrier of a multi-carrier system.
  • the special area may be allocated for signal transmission for the terminal-A.
  • the reference resource element of each of antennas 4 to 7 as described above may be disposed in the special region, or the reference resource elements of each of antennas 0 to 7 may be disposed.
  • Existing reference signals can be transmitted in the radio resource region except the special region in the advanced data region.
  • 35 shows another example of an advanced subframe structure in the case of a normal CP.
  • an advanced subframe has a difference in that a frequency band in which a special region is arranged in slot units is different. That is, special regions are arranged in different frequency bands based on slot boundaries in the first slot and the second slot.
  • allocation information about a special region may be informed through an upper layer signal such as an RRC. Alternatively, it may be indicated by a physical layer signal transmitted through a radio resource to which a downlink grant is allocated.
  • the allocation information for the special area may be configured in the form of a bitmap. For example, if each unit carrier includes a 1-bit information value indicating whether or not the OFDM symbol is a special area in units, a 14-bit bitmap (for a normal CP) is a special area. Can tell you whether or not.
  • a radio resource region to which a special region can be allocated may be informed through information on an allocation pattern of the special region.
  • the information on the allocation pattern of the special region may be composed of an initial band value composed of one or more bands and an allocation pattern indicator.
  • the reference signal for the legacy terminal is placed in the control region of the advanced subframe.
  • a reference signal for UE-A may be arranged together with a reference signal for legacy UE in the control region of the advanced subframe.
  • the reference signal for UE-A may be configured based on a control channel element (CCE), a resource element group (REG), and a resource element (RE).
  • CCE may correspond to 9 resource element groups.
  • the resource element group may consist of four resource elements.
  • the UE may allocate and operate a special area in subframe units. If the channel state does not change rapidly over time, a special area may be allocated and operated based on statistical measurements of the UE-As.
  • the base station 50 includes a processor 51, a memory 52, and an RF unit 53.
  • the processor 51 implements the proposed functions, processes and / or methods. That is, a reference signal for an extended antenna is generated, placed in an advanced subframe, and transmitted to the terminal. Layers of the air interface protocol may be implemented by the processor 51.
  • the memory 52 is connected to the processor 51 and stores various information for driving the processor 51.
  • the RF unit 53 is connected to the processor 51 and transmits and / or receives a radio signal.
  • the terminal 60 includes a processor 61, a memory 62, and an RF unit 63.
  • the processor 61 receives the reference signal for the extended antenna, measures the channel state, and transmits feedback information such as a CQI to the base station. Layers of the air interface protocol may be implemented by the processor 61.
  • the memory 62 is connected to the processor 61 and stores various information for driving the processor 61.
  • the RF unit 63 is connected to the processor 61 and transmits and / or receives a radio signal.
  • Processors 51 and 61 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters that interconvert baseband signals and wireless signals.
  • the transmitter of FIG. 6 may be implemented within the processors 51 and 61.
  • the memory 52, 62 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the RF unit 53,63 includes one or more antennas for transmitting and / or receiving radio signals.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. Modules are stored in memories 52 and 62 and can be executed by processors 51 and 61.
  • the memories 52 and 62 may be inside or outside the processors 51 and 61, and may be connected to the processors 51 and 61 by various well-known means.
  • an efficient reference signal transmission method and apparatus can be provided in a wireless communication system. While backward compatibility with legacy systems is maintained, it can support a larger number of transmit antennas than legacy systems. In other words, advanced systems may support legacy systems while using more extended transmit antennas than legacy systems. Support for a larger number of transmit antennas can increase the transmission rate or increase the reliability of wireless communications. Thus, overall system performance can be improved.

Abstract

L'invention porte sur un procédé et un appareil d'émission d'un signal de référence dans un système de radiocommunication. Le procédé consiste à : allouer M signaux de référence pour M antennes (où M est un entier naturel) dans une sous-trame avancée ; et émettre les M signaux de référence, où lesdits M signaux de référence sont alloués à une partie d'éléments de ressource qui est située au niveau de la même position que celle de l'élément de ressource dans lequel N signaux de référence pour N (où N est un entier naturel) antennes sont disposés dans une sous-trame patrimoniale, M étant supérieur à N. La présente invention porte sur le procédé et l'appareil d'admission d'un signal de référence pour un système avancé qui utilise un nombre accru d'antennes tout en conservant un surdébit de signaux de référence d'un système patrimonial.
PCT/KR2010/000555 2009-02-01 2010-01-29 Procédé et appareil d'émission d'un signal de référence dans un système de radiocommunication WO2010087646A2 (fr)

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