WO2013025014A2 - Appareil et procédé de commande de puissance d'émission de liaison montante dans un système de communication sans fil - Google Patents

Appareil et procédé de commande de puissance d'émission de liaison montante dans un système de communication sans fil Download PDF

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Publication number
WO2013025014A2
WO2013025014A2 PCT/KR2012/006381 KR2012006381W WO2013025014A2 WO 2013025014 A2 WO2013025014 A2 WO 2013025014A2 KR 2012006381 W KR2012006381 W KR 2012006381W WO 2013025014 A2 WO2013025014 A2 WO 2013025014A2
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Prior art keywords
transmission
reference signal
terminal
reception point
srs
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PCT/KR2012/006381
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English (en)
Korean (ko)
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WO2013025014A3 (fr
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권기범
박경민
안재현
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주식회사 팬택
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Publication of WO2013025014A3 publication Critical patent/WO2013025014A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to wireless communication, and more particularly, to an apparatus and method for controlling uplink transmission power in a wireless communication system.
  • Multi-cell coordination is also referred to as cooperative multiple point transmission and reception (CoMP).
  • CoMP includes a beam avoidance technique in which neighboring cells cooperate to mitigate interference to a user at a cell boundary, and a joint transmission technique in which neighboring cells cooperate to transmit the same data.
  • Next-generation wireless communication systems such as Institute of Electrical and Electronics Engineers (IEEE) 802.16m or 3rd Generation Partnership Project (3GPP) long term evolution (LTE) -Advanced, are located at cell boundaries and are subject to severe interference from adjacent cells.
  • IEEE Institute of Electrical and Electronics Engineers
  • 3GPP 3rd Generation Partnership Project
  • LTE long term evolution
  • CoMP can be considered.
  • RRHs remote radio heads
  • the terminal When the terminal performs uplink transmission by selecting one of the transmission and reception points (transmission and reception points) operating in CoMP, the criterion for determining the uplink transmission power has not yet been determined.
  • An object of the present invention is to provide an apparatus and method for controlling uplink transmission power in a wireless communication system.
  • Another object of the present invention is to provide an apparatus and method for controlling uplink transmission power in a wireless communication system including a terminal capable of receiving signals from a plurality of transmission and reception points.
  • Another technical problem of the present invention is to provide an apparatus and method for calculating a path attenuation difference between a transmitting and receiving point and a terminal using a sounding reference signal transmitted to a plurality of transmitting and receiving points.
  • Another technical problem of the present invention is to provide an apparatus and method for calculating a reference signal to a received signal, a path loss estimate, and an uplink transmission power using a reference signal transmitted for feedback of channel state information.
  • a control method of uplink transmission power for a terminal performed by a terminal may further include receiving a physical downlink shared channel (PDSCH) configuration information element indicating a transmission power with respect to a reference signal used for estimation of channel state information, and receiving the reference signal.
  • PDSCH physical downlink shared channel
  • RSRP reference signal received power
  • a method of controlling uplink transmission power for a terminal performed by a first transmission / reception point may further include receiving a sounding reference signal (SRS) from a terminal, a first path loss estimate between the terminal and the first transmission / reception point obtained from a result of receiving the SRS by a first transmission / reception point, Calculating a path attenuation difference, which is a difference between a second path attenuation expected value between the terminal and the second transmission / reception point obtained from a result of receiving the SRS by a second transmission / reception point, and a physical downlink shared channel indicating the path attenuation difference Sending a PDSCH configuration information element to the terminal.
  • SRS sounding reference signal
  • a terminal for controlling uplink transmission power for a terminal is provided.
  • the terminal is a physical downlink shared channel (PDSCH) configuration information element indicating a transmission power for a reference signal used for estimation of channel state information, a terminal RF unit for receiving the reference signal from the transmission and reception point, the PDSCH configuration Analyze information elements to obtain transmit power for the reference signal, derive energy per resource element of the reference signal from transmit power for the reference signal, and physical layer level filtering and higher layer level for the reference signal RRC message processing unit for calculating the RSRP by applying the filtering, and path loss calculation unit for calculating the energy loss per resource element of the reference signal and the path loss estimate for the transmission and reception point from the RSRP.
  • PDSCH physical downlink shared channel
  • the terminal When the terminal performs uplink transmission on a plurality of transmission / reception points using the same physical cell ID, it is possible to know the path loss estimate between each transmission / reception point, thereby enabling efficient uplink power control.
  • FIG. 1 is a block diagram showing a wireless communication system to which the present invention is applied.
  • FIGS. 2 and 3 schematically show the structure of a radio frame to which the present invention is applied.
  • FIG. 4 is a flowchart illustrating a method of controlling uplink transmission power according to an embodiment of the present invention.
  • FIG. 5 schematically illustrates an example in which a CSI-RS is mapped to a resource element in the case of a normal CP.
  • FIG. 6 schematically illustrates an example in which a CSI-RS is mapped to a resource element in the case of an extended CP.
  • FIG. 7 is an explanatory diagram illustrating a scenario in which a plurality of transmission and reception points and a terminal communicate with the present invention.
  • FIG. 8 is a flowchart illustrating a method of controlling uplink transmission power according to another example of the present invention.
  • FIG. 9 is an explanatory diagram illustrating another scenario in which a plurality of transmission and reception points and a terminal communicate with the present invention.
  • FIG. 10 is a block diagram illustrating a terminal and a transmission and reception point according to an embodiment of the present invention.
  • the present specification describes a communication network, and the work performed in the communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to
  • FIG. 1 is a block diagram showing a wireless communication system to which the present invention is applied.
  • the wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data.
  • the wireless communication system 10 includes at least one base station (BS) 11.
  • Each base station 11 provides a communication service for a particular geographic area or frequency area (generally called a cell) 15a, 15b, 15c.
  • Cells 15a, 15b, and 15c may in turn be divided into a number of regions (called sectors).
  • a user equipment (UE) 12 may be fixed or mobile, and may have a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
  • the base station 11 generally refers to a fixed station communicating with the terminal 12, and includes an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, an femto eNB, It may be called other terms such as a home eNB (HeNB), a relay, a remote radio head (RRH), and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • HeNB home eNB
  • RRH remote radio head
  • Cells 15a, 15b, and 15c should be interpreted in a comprehensive sense indicating some areas covered by the base station 11, and encompass all of the various coverage areas such as megacells, macrocells, microcells, picocells, and femtocells. to be.
  • downlink refers to a communication or communication path from the base station 11 to the terminal 12
  • uplink refers to a communication or communication path from the terminal 12 to the base station 11.
  • the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-FDMA
  • OFDM-FDMA OFDM-FDMA
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-FDMA
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme transmitted using different times or a frequency division duplex (FDD) scheme transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • the wireless communication system 10 may be a Coordinated Multi Point (CoMP) system.
  • the CoMP system refers to a communication system supporting CoMP or a communication system to which CoMP is applied.
  • CoMP is a technique for adjusting or combining signals transmitted or received by multi transmission / reception (Tx / Rx) points.
  • CoMP can increase data rates and provide high quality and high throughput.
  • the transmit / receive point may be defined as a frequency resource such as a component carrier or a cell, and may be a base station (macro base station, pico base station, femto base station, etc.), or remote radio head (RRH). It may be defined as a physical network component such as Alternatively, the transmission / reception point may be defined as a set of antenna ports.
  • the transceiver may transmit information about the set of antenna ports to the terminal through radio resource control (RRC) signaling. Therefore, a plurality of transmission and reception points in one cell may be defined as a set of antenna ports. The intersection between the set of antenna ports is always empty.
  • RRC radio resource control
  • the base station 11 of the cell 15a, the base station 11 of the cell 15b and the base station 11 of the cell 15c may configure multiple transmission / reception points.
  • the multiple transmit / receive points may be base stations of a macro cell forming a homogeneous network.
  • the multiple transmit / receive points may also be base stations of macro cells and base stations of pico cells within macro cells, forming a heterogeneous network.
  • the multiple transmission / reception points may be a base station of the macro cell and a remote radio unit (RRU) in the macro cell.
  • the multiple transmission / reception points may be RRHs belonging to the base station of the macro cell and RRHs belonging to the base station of the heterogeneous cell (e.g. pico cell) in the macro cell.
  • the CoMP system may selectively apply CoMP.
  • a mode in which a CoMP system performs communication using CoMP is called a CoMP mode, and a mode other than the CoMP system is called a normal mode.
  • the CoMP system may operate in CoMP mode.
  • the CoMP system may operate in a normal mode.
  • the terminal 12 may be a CoMP terminal.
  • the CoMP terminal is a component of the CoMP system and performs communication with a CoMP cooperating set. Like the CoMP system, the CoMP terminal may operate in the CoMP mode or in the normal mode.
  • the CoMP cooperative set is a set of transmit / receive points that directly or indirectly participate in data transmission on a time-frequency resource for a CoMP terminal.
  • the base station 11 of the cell 15a, the base station 11 of the cell 15b, and the base station 11 of the cell 15c may form a CoMP cooperative set.
  • the transmit and receive points do not necessarily have to provide the same coverage.
  • base station 11 of cell 15a may be a base station providing a macro cell
  • base station 11 of cell 15b may be an RRH.
  • Participating directly in data transmission or reception means that the transmitting and receiving points actually transmit data to or receive data from the CoMP terminal in the corresponding time-frequency resource.
  • Indirect participation in data transmission or reception means that the transmit / receive points do not actually transmit or receive data to or from the CoMP terminal in the corresponding time-frequency resource, but contribute to making decisions about user scheduling / beamforming. .
  • the CoMP terminal may simultaneously receive signals from the CoMP cooperative set or transmit signals simultaneously to the CoMP cooperative set. At this time, the CoMP system minimizes the interference effect between the CoMP cooperation sets in consideration of the channel environment of each cell constituting the CoMP cooperation set.
  • a channel environment is formed between the reception point and the CoMP terminal.
  • the channel environment is a set of parameters that affect scheduling for a CoMP terminal, such as a frequency bandwidth allocated to the CoMP terminal and a downlink pathloss (PL).
  • the channel environment is formed individually for each receiving point. This means that the channel environment may be different for each receiving point. If the channel environment is different for each receiving point, the CoMP terminal should set uplink transmission power differently for each receiving point. Therefore, the CoMP terminal needs to know how the channel environment is different for each receiving point.
  • the first scenario is an intra-site CoMP scenario in which a plurality of cells exist around one base station.
  • the second scenario is a high-power CoMP scenario in which a plurality of high-power RRHs exist around one macro cell.
  • the third scenario is a CoMP scenario in which a low-power RRH exists around one macro cell but the physical cell ID of the RRH and the physical cell ID of the macro cell are not the same.
  • the fourth scenario is a CoMP scenario in which a low-power RRH exists around one macro cell, but the physical cell ID of the RRH and the physical cell ID of the macro cell are the same.
  • the CoMP terminal may distinguish each receiving point and may distinguish different channel environments for each receiving point.
  • the physical cell IDs of the transmission and reception points are the same as in the fourth scenario, the CoMP terminal should distinguish a plurality of reception points and accordingly different channel environments.
  • CoMP's category includes Joint Processing (JP) and Coordinated Scheduling / Beamforming (CS / CB). It is also possible to mix CSCB with.
  • JP Joint Processing
  • CS / CB Coordinated Scheduling / Beamforming
  • JP Joint Transmission
  • DPS Dynamic Point Selection
  • JT refers to data transmission being performed together from multiple transmission / reception points belonging to a CoMP cooperative set to one terminal or a plurality of terminals in time-frequency resources.
  • multiple cells multi-transmitting / receiving points transmitting data to one terminal perform transmission using the same time / frequency resource.
  • DPS Dynamic Cell Selection
  • CS data is transmitted from one transmit / receive point in a CoMP cooperation set for time-frequency resources, and user scheduling is determined by coordination between the points of that CoMP cooperation set.
  • the transmission / reception point used is dynamically or semi-statically selected.
  • dynamically selecting a transmit / receive point transmission is performed only at one transmit / receive point at a time, which may change from subframe to subframe, and includes changing across resource block pairs within a subframe.
  • semi-statically selecting points only one transmission / reception point is transmitted at a time, and the transmission / reception point can be changed only in a semi-static manner.
  • CB Coordinatd Beamforming
  • some transmit / receive points in the CoMP cooperative set may transmit data to the target terminal according to JP, and other transmit / receive points in the CoMP cooperative set may perform CS / CB.
  • the channel quality indicator (CQI) value may be derived by a zero power CSI-RS configuration.
  • the transmission and reception point to which the present invention is applied may include a base station, a cell, or an RRH. That is, the base station or the RRH may be a transmission / reception point. Meanwhile, the plurality of base stations may be multiple transmission / reception points, and the plurality of RRHs may be multiple transmission / reception points. Of course, the operation of all base stations or RRH described in the present invention can be equally applied to other types of transmission and reception points.
  • the layers of the radio interface protocol between the terminal and the base station are based on the lower three layers of the Open System Interconnection (OSI) model, which is well known in the communication system. It may be divided into a second layer L2 and a third layer L3. Among them, the physical layer belonging to the first layer provides an information transfer service using a physical channel.
  • OSI Open System Interconnection
  • the physical downlink control channel is a resource allocation and transmission format of a downlink shared channel (DL-SCH), a resource of an uplink shared channel (UL-SCH).
  • Resource allocation of upper layer control messages such as allocation information, random access responses transmitted on a physical downlink shared channel (PDSCH), and transmission power control for individual terminals in any terminal group : TPC) can carry a set of commands.
  • a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • DCI downlink control information
  • the DCI may include an uplink or downlink resource allocation field, an uplink transmission power control command field, a control field for paging, a control field for indicating a random access response (RA response), and the like.
  • DCI has different uses according to its format, and fields defined in DCI are also different.
  • Table 1 shows DCIs according to various formats.
  • Table 1 DCI format Explanation 0 Used for scheduling of PUSCH (Uplink Grant) One Used for scheduling one PDSCH codeword in one cell 1A Used for simple scheduling of one PDSCH codeword in one cell and random access procedure initiated by PDCCH command 1B Used for simple scheduling of one PDSCH codeword in one cell using precoding information 1C Used for brief scheduling of one PDSCH codeword and notification of MCCH change 1D Used for simple scheduling of one PDSCH codeword in one cell containing precoding and power offset information 2 Used for PDSCH scheduling for UE configured in spatial multiplexing mode 2A Used for PDSCH scheduling of UE configured in long delay CDD mode 2B Used in transmission mode 8 (double layer transmission) 2C Used in transmission mode 9 (multi-layer transmission) 3 Used to transmit TPC commands for PUCCH and PUSCH with power adjustment of 2 bits 3A Used to transmit TPC commands for PUCCH and PUSCH with single bit power adjustment 4 Used for scheduling uplink shared channel (PUSCH).
  • PUSCH scheduling for a terminal Used for simple scheduling of
  • DCI format 0 is uplink scheduling information, format 1 for scheduling one PDSCH codeword, format 1A for compact scheduling of one PDSCH codeword, and very simple of DL-SCH.
  • Format 1C for scheduling format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode, format 2A for PDSCH scheduling in open-loop spatial multiplexing mode, and uplink channel Formats 3 and 3A for transmission of a transmission power control (TPC) command.
  • TPC transmission power control
  • Each field of the DCI is sequentially mapped to n information bits a 0 to a n-1 . For example, if DCI is mapped to information bits of a total of 44 bits in length, each DCI field is sequentially mapped to a 0 to a 43 .
  • DCI formats 0, 1A, 3, and 3A may all have the same payload size.
  • DCI format 0 may be called an uplink grant.
  • FIGS. 2 and 3 schematically show the structure of a radio frame to which the present invention is applied.
  • a radio frame includes 10 subframes.
  • One subframe includes two slots.
  • the time (length) of transmitting one subframe is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • One slot may include a plurality of symbols in the time domain.
  • the symbol in a wireless system using orthogonal frequency division multiple access (OFDMA) in downlink (DL), the symbol may be an orthogonal frequency division multiplexing (OFDM) symbol.
  • OFDM orthogonal frequency division multiplexing
  • the representation of the symbol period in the time domain is not limited by the multiple access scheme or the name.
  • the plurality of symbols in the time domain may be a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol, a symbol interval, or the like in addition to the OFDM symbol.
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • the number of OFDM symbols included in one slot may vary depending on the length of a cyclic prefix (CP). For example, in case of a normal CP, one slot may include 7 OFDM symbols, and in case of an extended CP, one slot may include 6 OFDM symbols.
  • CP cyclic prefix
  • One slot includes a plurality of subcarriers in the frequency domain and seven OFDM symbols in the time domain.
  • a resource block (RB) is a resource allocation unit. If a resource block includes 12 subcarriers in the frequency domain, one resource block may include 7 ⁇ 12 resource elements (REs).
  • the resource element represents the smallest frequency-time unit to which the modulation symbol of the data channel or the modulation symbol of the control channel is mapped. If there are M subcarriers on one OFDM symbol, and one slot includes N OFDM symbols, one slot includes MxN resource elements.
  • a wireless communication system it is necessary to estimate an uplink channel or a downlink channel for data transmission / reception, system synchronization acquisition, channel information feedback, and the like.
  • the process of restoring a transmission signal by compensating for distortion of a signal caused by a sudden change in channel environment is called channel estimation.
  • channel estimation it is also necessary to measure the channel state (channel state) for the cell to which the terminal belongs or other cells.
  • a reference signal (RS) that is known to a terminal and a transceiver is mutually used for channel estimation or channel state measurement.
  • the channel estimate estimated using the reference signal p Is Depends on the value, so to get an accurate estimate of You need to converge to zero.
  • the channel can be estimated by minimizing the effects of
  • the reference signal may be allocated to all subcarriers or may be allocated between data subcarriers for transmitting data.
  • a signal of a specific transmission timing is composed of only a reference signal such as a preamble in order to obtain a gain of channel estimation performance.
  • the amount of data transmission can be increased.
  • the reference signal is generally transmitted using a sequence.
  • any sequence may be used without particular limitation.
  • the reference signal sequence may use a PSK-based computer generated sequence. Examples of PSKs include binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK).
  • the reference signal sequence may use a constant amplitude zero auto-correlation (CAZAC) sequence. Examples of CAZAC sequences are ZC-based sequences, ZC sequences with cyclic extensions, ZC sequences with truncation, etc. There is this.
  • the reference signal sequence may use a pseudo-random (PN) sequence. Examples of PN sequences include m-sequences, computer generated sequences, Gold sequences, and Kasami sequences.
  • the reference signal sequence may use a cyclically shifted sequence.
  • the downlink reference signal includes a cell-specific RS (CRS), an MBSFN reference signal, a UE-specific RS, a positioning reference signal (PRS), and channel state information (CSI). And a reference signal (CSI-RS).
  • CRS cell-specific RS
  • MBSFN reference signal MBSFN reference signal
  • PRS positioning reference signal
  • CSI-RS channel state information
  • a plurality of physically configured antennas are basically required.
  • each antenna port for transmitting only one reference signal per antenna is mapped 1: 1 with the physical antenna.
  • the antenna port may be mapped 1: 1 or 1: n with a physical antenna.
  • the number of logically configurable antenna ports may be one, two, or four.
  • the antenna ports have a mapping relationship with four physical antennas. Also, if the number of antenna ports is two, each antenna port may have a mapping relationship with one to three physical antennas among four physical antennas. In this case, the total number of physical antennas mapped to all the antenna ports may not exceed four, which is the total number of physical antennas.
  • the CRS is a reference signal transmitted to all terminals in a cell and used for channel estimation.
  • the CRS may be transmitted in all downlink subframes in a cell supporting PDSCH transmission.
  • the UE-specific reference signal is a reference signal received by a specific terminal or a specific terminal group in a cell, and is mainly used for data demodulation of a specific terminal or a specific terminal group and may be called a demodulation reference signal (DMRS).
  • DMRS demodulation reference signal
  • the MBSFN reference signal is a reference signal for providing a multimedia broadcast multicast service (MBMS) and may be transmitted in a subframe allocated for MBSFN transmission.
  • the MBSFN reference signal may be defined only in the extended CP structure.
  • the PRS may be used for location measurement of the terminal.
  • the PRS may be transmitted only through resource blocks in a downlink subframe allocated for PRS transmission.
  • CSI-RS may be used for estimation of downlink channel state information.
  • the CSI-RS is placed in the frequency domain or time domain.
  • Channel quality indicator (CQI), precoding matrix indicator (PMI) and rank indicator (RI) rank information such as channel quality indicator (CQI), if necessary through the estimation of the channel state using the CSI-RS As reported from the terminal.
  • the CSI-RS may be transmitted on one or more antenna ports.
  • FIG. 4 is a flowchart illustrating a method of controlling uplink transmission power according to an embodiment of the present invention.
  • the present invention will be described based on the CSI-RS for ease of explanation.
  • the UE receives a PDSCH configuration information element and configuration information about a CSI-RS, a PDSCH configuration information element, or configuration information about a CSI-RS from a transmitting and receiving point (S400). ).
  • the PDSCH configuration information element may be information included in an RRC message used to define a common or UE specific PDSCH configuration, for example, a system information block (SIB) 2. As shown in the table.
  • PDSCH-ConfigCommon SEQUENCE ⁇ referenceSignalPower INTEGER (-60..50), pb INTEGER (0..3)
  • ⁇ PDSCH-ConfigDedicated SEQUENCE ⁇ pa ENUMERATED ⁇ dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, dB3 ⁇ ⁇ -ASN1STOP
  • the PDSCH configuration information element includes a PDSCH-ConfigCommon field and a PDSCH-ConfigDedicated field.
  • p-a is a terminal specific parameter and p-b is a cell specific parameter.
  • referenceSignalPower is a downlink reference signal transmission power and may be derived from energy per resource element (EPRE) of the downlink reference signal, for example, from energy per resource element (EPRE) of the PDSCH. have.
  • EPRE energy per resource element
  • reference signal received power is a linear average of the power contributions of all the resource elements carrying the CRS or CSI-RS within the operating system bandwidth. average).
  • RSRP reference signal received power
  • EPREs of a plurality of transmission and reception points for example, EPRE of the base station and EPRE for the RRH may be set differently. This is shown in the following table as another example of the PDSCH configuration information element.
  • PDSCH-ConfigCommon SEQUENCE ⁇ referenceSignalPower _eNB INTEGER (-60..50), referenceSignalPower _RRH INTEGER (-60..50), pb INTEGER (0..3)
  • PDSCH-ConfigDedicated SEQUENCE ⁇ pa ENUMERATED ⁇ dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, dB3 ⁇ ⁇ -ASN1STOP
  • an energy per resource element (EPRE) value different from a base station eNB and an RRH is set in the PDSCH-ConfigCommon field.
  • the EPRE values between the eNB and the RRH are different, but the EPRE values are the same between the RRHs.
  • EPREs for each transmission and reception point may be set differently. This is shown in the following table as another example of the PDSCH configuration information element.
  • PDSCH-ConfigCommon SEQUENCE ⁇ referenceSignalPower _eNB INTEGER (-60..50), referenceSignalPower _RRH1 INTEGER (-60..50), referenceSignalPower _RRH2 INTEGER (-60..50), pb INTEGER (0..3)
  • PDSCH-ConfigDedicated SEQUENCE ⁇ pa ENUMERATED ⁇ dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, dB3 ⁇ ⁇ -ASN1STOP
  • EPRE values different from the base station eNB, RRH1, and RRH2 are set in the PDSCH-ConfigCommon field.
  • the configuration information (CSI-RS-Config) related to the CSI-RS is an information element used to specify the CSI-RS configuration and is individually transmitted to each terminal using the CSI-RS.
  • Setting information about the CSI-RS may be defined as shown in the table below.
  • CSI-RS-Config SEQUENCE ⁇ csi-RS CHOICE ⁇ release NULL, setup SEQUENCE ⁇ antennaPortsCount ENUMERATED ⁇ an1, an2, an4, an8 ⁇ , resourceConfig INTEGER (0..31), subframeConfig INTEGER (0..154), pC-eNB INTEGER (-8..15) pC-RRH INTEGER (-8..15) ⁇ ⁇ OPTIONAL,-Need ON zeroTxPowerCSI-RS CHOICE ⁇ release NULL, setup SEQUENCE ⁇ zeroTxPowerResourceConfigList BIT STRING (SIZE (16)), zeroTxPowerSubframeConfig INTEGER (0..154) ⁇ ⁇ OPTIONAL-Need ON ⁇ -ASN1STOP
  • the number of antenna ports represents the number of antenna ports used for CSI-RS transmission, an1 means one antenna port, and an2 means two antenna ports.
  • p-C is an estimated ratio of energy per resource element (EPRE) of PDSCH to energy per resource element (EPRE) of CSI-RS when UE induces CSI feedback.
  • the EPRE of the PDSCH can be obtained through the PDSCH configuration information element.
  • Energy per resource element of the CSI-RS is a concept equivalent to the transmission power of the CSI-RS.
  • the UE may derive or calculate the transmit power of the CSI-RS based on the ratio p-C and the EPRE of the PDSCH.
  • the p-C informs the ratio of the transmit power of the CSI-RS, but the terminal may calculate the transmit power of the CSI-RS through this. Therefore, the configuration information about the CSI-RS including p-C actually indicates the transmit power of the CSI-RS.
  • p-C has a value in the range of [-8, 15] dB and increases and decreases in 1 dB increments.
  • p-C-eNB is a case where the transceiver point is a base station, and is a p-C for the CSI-RS transmitted by the base station.
  • p-C-RRH is a case where the transmission / reception point is RRH, and is p-C for CSI-RS transmitted by RRH.
  • the energy per PDSCH resource element is equal to the energy per resource element (EPRE) of the downlink reference signal indicated by referenceSignalPower in Tables 2 to 4 above.
  • the terminal may calculate the EPRE of the CSI-RS transmitted by the base station (NB) using referenceSignalPower and p-C-eNB.
  • the terminal may calculate the EPRE of the CSI-RS transmitted by the RRH using referenceSignalPower and p-C-RRH.
  • the terminal receives the CSI-RS mapped to the resource element for any serving cell C from the transmission and reception point (S405).
  • 5 schematically illustrates an example in which a CSI-RS is mapped to a resource element in the case of a normal CP.
  • the mapping of CSI-RS shown in FIG. 5 is an example of CSI configuration 0 for a normal CP, where Rp represents a resource element used for CSI-RS transmission at antenna port P.
  • FIG. 6 schematically illustrates an example in which a CSI-RS is mapped to a resource element in the case of an extended CP.
  • the mapping of CSI-RS shown in FIG. 6 relates to CSI configuration 0 for extended CP.
  • the CSI-RS may be mapped to resource elements in a predetermined pattern according to the antenna port transmitted.
  • the UE induces energy per resource element (EPRE) of the CSI-RS based on the received CSI-RS based on the EPRE and pC values of the PDSCH obtained from the referenceSignalPower in the PDSCH-ConfigCommon field.
  • a reference signal received power (RSRP) is calculated (S410).
  • the terminal may select whether to use the CRS or the CSI-RS as the basis for the RSRP measurement or the calculation of the path loss estimate. For example, the terminal may select one of the CRS and the CSI-RS as a criterion for the RSRP measurement or the calculation of the path loss estimate based on the priority. For example, if the DPS is applied, the CSI-RS may have a priority over the CRS, and if the DPS is not applied, the CRS may have a priority over the CSI-RS.
  • RSRP is defined as the linear average of the power contributions of all resource elements carrying CRS or CSI-RS within the considered measurement frequency bandwidth.
  • CRS is defined for antenna ports 0, 1, 2, and 3 and CSI-RS is defined for antenna ports 15 to 22. Therefore, R 0 means CRS present in antenna port 0 and R 15 means CSI-RS present in antenna port 15 (see FIGS. 5 and 6).
  • RSRP may be specifically obtained by the following procedure.
  • the terminal acquires measurement samples by filtering at the physical layer level, and filters the measurement samples at a higher layer level as in the following equation.
  • Equation 2 M n is the most recent measurement sample, F n is the measurement to be reported by the measurement report, F n-1 is the measurement reported by the previous measurement report, and a is 1/2 where (k / 4) k is the filter coefficient used for filtering.
  • the measurement sample is a measurement value in units of subframes and is a variable required to derive RSRP or RSRQ (Reference Signal Received Quality).
  • the measurement sample means a measurement value for the subframe selected by the measurement rule defined in the wireless system among the measurement values for all the subframes received by the terminal.
  • the measurement sample may be obtained at the physical layer of the terminal, and filtering may be performed at an upper layer of the terminal, for example, a radio resource control (RRC) layer.
  • RRC radio resource control
  • the measurement sample may be acquired continuously every subframe, but may be obtained discontinuously as long as the capacity of the terminal or a condition defined by the system is satisfied. That is, another measurement sample may be obtained after a predetermined interval of time after one measurement sample is obtained. In this case, measurement samples are not obtained for some subframes.
  • the spacing section may be periodic or aperiodic.
  • RSRQ may be defined as a ratio between RSRP and Received Signal Strength Indicator (RSSI) as shown in Equation (3).
  • N is the number of resource elements of the carrier RSSI measurement bandwidth of the radio access network.
  • the numerator and denominator are measured for the same set of resource blocks.
  • RSSI includes a linear average of the total received power. The total received power is observed only within an OFDM symbol containing reference symbols within the measurement bandwidth and is a value obtained over N resource blocks. If the UE receives signaling indicating RSRQ measurement at a higher layer, RSSI measurement is performed for all OFDM symbols in the subframe in which the RSRQ measurement is indicated.
  • the terminal calculates a pathloss (PL C ) estimate between the transmitting and receiving point and the terminal from the EPRE value of the CSI-RS and the RSRP (S415).
  • the path loss estimate can be obtained by the following equation.
  • PL C is an estimated downlink path loss for the serving cell C calculated by the UE in dB units.
  • referenceSignalPower ' is the EPRE value of CSI-RS in dBm unit.
  • the link decision between referenceSignalPower 'and RSRP used for calculating the serving cell C and PL C selected as the reference serving cell may be configured by pathlossReferenceLinking information, which is a higher layer parameter.
  • the reference serving cell configured by the path loss reference link information includes a primary serving cell (PCell) or an uplink component carrier (UL CC) and a secondary serving cell (corresponding) in which SIB2 is established. It may be a downlink SCC of a serving cell (SCell).
  • the CRS which is a reference for RSRP measurement
  • the terminal cannot distinguish the path loss estimate for each transmission / reception point based on the CRS.
  • RSRP should be measured separately for each transmission / reception point.
  • the UE can accurately control the uplink transmission power by knowing the path loss estimate for each transmission / reception point. For example, in the CoMP system as shown in FIG.
  • the CoMP terminal may dynamically perform uplink transmission for either or both of transmission point 1 and transmission point 2 or both based on DPS. At this time, if PL1 and PL2 are not distinguished, the terminal may incorrectly recognize the path loss estimate for the transceiver point 2 as PL1, and assign an PL1 to Equation 5 or Equation 6 to calculate an uplink transmission power. have.
  • the terminal may calculate the accurate uplink transmission power for each transmission / reception point.
  • the terminal may select one transmission / reception point among multiple transmission / reception points as a target for uplink transmission according to the DPS operation.
  • the terminal applies the path loss estimate calculated based on the signal received from the selected transmission and reception point to derive uplink transmission power. That is, the terminal calculates a path loss estimate for the transmission and reception point for selecting the uplink radio link on the basis of the determination of the terminal itself, without additional signaling from the transmission and reception point, especially the base station and applies it to derivation of the uplink transmission power.
  • the terminal uses the path loss estimate for the transceiver point set as the first serving cell to derive uplink transmit power for the transceiver point selected according to the DPS operation. This corresponds to a case in which the UE cannot select one transmission / reception point as a target for uplink transmission according to the DPS operation in the CoMP mode. Therefore, the terminal adjusts the path loss estimate of the transceiver point selected by the DPS operation from the base station through TPC signaling.
  • the TPC signaling may proceed through a DCI format 3 / 3A signal.
  • the terminal calculates uplink transmission power from the path loss estimate for the serving cell C (S420).
  • the uplink physical channel includes a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH).
  • the uplink transmission power may be controlled differently according to the uplink physical channel to transmit.
  • the uplink transmission power PPUSCH, C (i) is scaled by the number of antennas for which at least one PUSCH transmission is performed and the number of antennas configured according to the transmission scheme.
  • C is a serving cell to perform uplink transmission
  • i is a number of a subframe in which uplink transmission is performed to power PPUSCH, C (i).
  • the adjusted total uplink transmission power is equally divided and allocated to the antennas performing at least one PUSCH transmission.
  • PUSCH transmission power is further divided into i) a case in which PUSCH and PUCCH are not transmitted simultaneously for any serving cell C and ii) a case in which both PUSCH and PUCCH are simultaneously transmitted.
  • the UE calculates an uplink transmission power P PUSCH, C (i) defined by the following equation in subframe i for the serving cell C.
  • the UE calculates an uplink transmission power P PUSCH, C (i) defined by the following equation in subframe i for the serving cell C.
  • P CMAX, C (i ) is the maximum UE transmission power is configured for the serving cell C, Is the linear value of dB. Meanwhile, Is a value obtained by linearly converting P PUCCH (i).
  • M PUSCH, C (i) is a value representing the bandwidth of a resource allocated with a PUSCH in the subframe i for the serving cell C as the number of resource blocks.
  • P 0_PUSCH, C (i) is the sum of P 0_NOMINAL_PUSCH, C (j) and P 0_UE_PUSCH, C (j) for the serving cell C.
  • j 0.
  • j 1.
  • j 2.
  • P 0_UE_PUSCH 0 and P 0_NOMINAL_PUSCH
  • C (2) P 0_PRE + ⁇ PREAMBLE_Msg3 , where parameters P 0_PRE and ⁇ PREAMBLE_Msg3 are signaled from higher layers .
  • P 0_PRE may be indicated as preambleInitialReceivedTargetPower.
  • K S is a parameter provided as deltaMCS-Enabled in the upper layer for each serving cell C.
  • transmission mode 2 which is a mode for transmit diversity
  • K S 0.
  • C is the number of code blocks
  • K r is the size of the code block
  • O CQI is the number of CQI / PMI bits including the number of CRC bits
  • ⁇ PUSCH offset ⁇ CQI offset is set. Otherwise, it is always set to 1.
  • ⁇ PUSCH, C is a correction value.
  • it is determined by referring to a TPC command present in DCI format 0 or 4 for serving cell c or a TPC command in DCI format 3 / 3A that is encoded and transmitted jointly with other terminals.
  • DCI format 3 / 3A cyclic redundancy check (CRC) parity bits are scrambled with TPC-PUSCH-RNTI, so only terminals assigned the RNTI value can be checked.
  • CRC cyclic redundancy check
  • f c (i) represents a PUSCH power control adjustment state for the current serving cell C, and is defined as follows.
  • Equation (7) is the case in which accumulation is activated by a higher layer for serving cell C or when DCI format 0 scrambled by a temporary C (Cell) -RNTI is included in the PDCCH. .
  • f c (0) is the first value after the cumulative reset.
  • K PUSCH value in case of FDD, K PUSCH is 4, and when TDD is 1 to 6, K PUSCH values are shown in the following table.
  • the portion marked with '-' is a DL subframe, and the portion indicated with a number is an UL subframe.
  • TDD configuration # 0 if a PDCCH for scheduling PUSCH transmission exists in subframe # 2 or subframe # 7, a LSB (Least Significant Bit) value of a 2-bit UL index in DCI format 0/4 in the PDCCH If is set to '1' K PUSCH is 7. K PUSCH values in all other cases are shown in Table 6 above.
  • the 2-bit UL index is used to schedule UL subframes that cannot be scheduled in Table 6.
  • the UE attempts to decode the PDCCH in all subframes except when the DRX operation is performed.
  • the terminal should use only ⁇ PUSCH, C of DCI format 0/4.
  • ⁇ PUSCH, C is 0dB when there is no TPC command for the serving cell C, during DRX operation, or when the corresponding subframe is an UL subframe of TDD.
  • the TPC command fields in DCI format 0/3/4 are 0, 1, 2, and 3, respectively, the accumulated ⁇ PUSCH, C dB values are -1,0,1,3, respectively.
  • the PDCCH of DCI format 0 is approved as the SPS activation or release PDCCH
  • ⁇ PUSCH, C is 0 dB.
  • the TPC command fields in DCI format 3A are 0 and 1, respectively, the accumulated ⁇ PUSCH and C dB values are ⁇ 1 and 1, respectively.
  • the positive TPC command will not accumulate. If the terminal reaches the minimum power, negative TPC commands will not accumulate.
  • the UE will reset the accumulation.
  • Equation 7 when accumulation is deactivated by the higher layer with respect to the serving cell C, f c (i) is as follows.
  • K PUSCH value 4 for FDD and is given as shown in Table 6 in TDD UL / DL configuration # 1 to # 6.
  • K PUSCH is 7. Otherwise, K PUSCH is given as shown in Table 6 above.
  • f c (i) is equal to f c (i-1). same.
  • f c (0) ⁇ P rampup + ⁇ msg2 , where ⁇ msg2 is a TPC command indicated by a random access response.
  • the TPC command is present in 3 bits in the DCI in the PDCCH for indicating the location of the PDSCH including the RAR MAC CE.
  • ⁇ P rampup is provided by the upper layer and is for the total power ramp-up from the first preamble to the last preamble.
  • the terminal transmits the PUSCH to the reception point at the calculated uplink transmission power (S425).
  • FIG. 8 is a flowchart illustrating a method of controlling uplink transmission power according to another example of the present invention. 8 is described based on FIG. 9 illustrating signaling of a CoMP system.
  • the base station eNB transmits the CRS to the terminal (S800).
  • the base station is one of the transmission and reception points in the CoMP system, and is connected to the other transmission and reception point RRH.
  • the RRH may or may not transmit CRS. If the RRH transmits the CRS, it transmits a CRS that can be identified by the same physical cell ID (PID) value as the base station.
  • PID physical cell ID
  • the terminal calculates a transmission power of a sounding reference signal (SRS) by the following equation based on the CRS (S805).
  • SRS sounding reference signal
  • P SRS, C (i) is a transmission power of the terminal for the sounding reference signal transmitted in subframe i for the serving cell C, and is in dBm unit.
  • P CMAX, C (i) indicates an uplink maximum transmission power configured in a terminal defined in subframe i for serving cell C.
  • K S 1.25
  • the values of P SRS_OFFSET, C (m) are given in 1 dB intervals in the range of [-3,12] dB.
  • K S 0, the values of P SRS_OFFSET, C (m) are It is given in 1.5 dB steps in the range [-10.5,12] dB.
  • M SRS, C is a bandwidth of SRS transmission in subframe i for serving cell C and is expressed in units of resource blocks.
  • f c (i) represents a PUSCH power control adjustment state for the current serving cell C, and is defined as in Equation 7 or Equation 8.
  • P 0_PUSCH, C (j) and ⁇ C (j) are as defined in Equations 7 and 8 above.
  • the terminal transmits the SRS to the transmission and reception points with the calculated SRS transmission power (S810).
  • the SRS may be transmitted on a symbol of a designated position in a subframe.
  • the SRS may be transmitted on the last SC-FDMA symbol in an uplink subframe.
  • the base station and the RRH each receive the SRS from the terminal.
  • a first radio link (RL) RL1 is formed between the terminal and the base station, and actual path attenuation occurs by PL1.
  • a second radio link RL2 is formed between the terminal and the RRH, and the actual path attenuation occurs by PL2.
  • SRS_RL1 (hereinafter referred to as directly received SRS) directly received by the base station and SRS_RL2 (hereinafter referred to as indirectly received SRS) received indirectly through the RRH may be considered different.
  • the base station calculates the path loss estimate SRS_PL1 according to SRS_RL1 and calculates the path loss estimate SRS_PL2 according to SRS_RL2 (S815).
  • the base station calculates a path attenuation difference ⁇ PL which is a difference between SRS_PL1 and SRS_PL2 according to Equation 10 (S820).
  • the path loss difference ⁇ PL is used by the terminal to calculate the path loss prediction PL2 in RL2. This is because, since the terminal can know PL1 using the CRS transmitted from the base station, PL2 can be obtained according to Equation 10 only by knowing ⁇ PL.
  • the base station transmits a PDSCH configuration information element including information on the path loss difference ⁇ PL to the terminal (S825).
  • the PDSCH configuration information element may be defined as shown in the following table.
  • a reference transmission / reception point index is an index indicating a transmission / reception point at which a reference PL value exists, that is, a base station in FIG. 9.
  • the target transmission / reception point index is an index indicating a transmission / reception point at which a reference PL value does not exist, that is, an RRH in FIG. 9.
  • delta_Pathloss is a path attenuation difference ⁇ PL and has a value between -60 and 50 dB.
  • the PDSCH configuration information element is transmitted on the data area as an RRC message.
  • the data region to which the PDSCH configuration information element is mapped is indicated by the PDCCH.
  • the DCI mapped to the PDCCH may be DCI format 3 / 3A scrambled with TPC-PUSCH-RNTI.
  • the DCI mapped to the PDCCH may be transmitted as a TPC command in DCI format 0/4, which is scrambled with C-RNTI. Accordingly, the UE may blindly decode the PDCCH first and acquire a PDSCH configuration information element indicated by the PDCCH in a data region.
  • the terminal calculates PL2 by substituting PL1 and the path attenuation difference ⁇ PL into Equation 10, and calculates a PUSCH uplink transmission power based on PL2 (S830).
  • PL1 can be calculated by the UE directly from the CRS
  • ⁇ PL can be known from the PDSCH configuration information element received from the base station.
  • the values of parameters such as PL1, PL2, ⁇ PL and the calculation of Equation 10 may be obtained according to real values rather than dB.
  • the UE may calculate the PUSCH uplink transmission power by substituting PL2 into Equation 5 or 6 above.
  • the UE transmits the PUSCH to the RRH at the calculated PUSCH uplink transmission power (S835).
  • one of the plurality of transmission / reception points ie, the base station or the RRH
  • the PUSCH may be transmitted to the target.
  • the UE selects the RRH as a target, the UE transmits the PUSCH to the RRH with an uplink transmission power reflecting the PL2 calculated by step S830.
  • FIG. 10 is a block diagram illustrating a terminal and a transmission and reception point according to an embodiment of the present invention.
  • the terminal 1000 and the transmission / reception point 1050 exchange signals with each other in a lower layer such as a physical layer, or a higher layer such as a medium access control (MAC) layer or an RRC layer. You can send and receive signals at the layer.
  • Both the terminal 1000 and the transmission / reception point 1050 may configure a CoMP system. That is, the terminal 1000 may be a CoMP terminal, and the transmission / reception point 1050 may be a base station or RRH, and transmits a signal to the terminal 1000 in cooperation with another transmission / reception point based on the CoMP mode, or from the terminal 1000. It can receive a signal.
  • the terminal 1000 includes a terminal RF unit 1005 and a terminal processor 1010.
  • the terminal processor 1010 further includes an RRC message processor 1011 and a path loss calculator 1012.
  • the terminal RF unit 1005 receives the PDSCH configuration information element, which is an upper layer message, configuration information about the CSI-RS, and a reference signal, which is a lower layer signal, from the transmission / reception point 1050 and sends it to the terminal processor 1010.
  • the upper layer message is sent to the RRC message processor 1011
  • the lower layer signal is sent to the path loss calculator 1012.
  • the reference signal is a reference signal (CSI-RS) used for estimation of downlink channel state information (CSI) or a reference signal (CRS) transmitted to all terminals in a cell.
  • the terminal RF unit 1005 transmits a PUSCH or SRS, which is a lower layer signal, to the transceiver point 1050.
  • the RRC message processor 1011 analyzes the PDSCH configuration information element and configuration information about the CSI-RS to obtain parameters to be used for calculating the downlink path loss estimate between the terminal 1000 and the transmission / reception point 1050.
  • the RRC message processing unit 1011 may determine the EPRE of the PDSCH to be used to calculate the downlink path loss estimate between the UE 1000 and the transceiver point 1050 from the referenceSignalPower of the transceiver point 1050 included in the PDSCH configuration information element. Acquire.
  • the PDSCH configuration information element may be defined, for example, in any one form of Tables 2 to 4.
  • the RRC message processing unit 1011 obtains a guess ratio p-C of energy per PDSCH (EPRE) to energy per CSI-RS resource element (EPRE) for inducing CSI feedback in configuration information about the CSI-RS.
  • the RRC message processor 1011 informs the path loss calculator 1012 of p-C to be used for calculating the downlink path loss estimate.
  • the path loss calculator 1012 may select the reference signal based on the priority among the CSI-RS and the CRS.
  • the path loss calculator 1012 calculates an RSRP for the CSI-RS, for example, using Equation 2.
  • the path loss calculator 1012 calculates an EPRE of the CSI-RS based on the EPREs of the p-C and the PDSCH, and calculates a path loss estimate based on the EPRE and RSRP of the CSI-RS (S1012).
  • the path loss calculator 1012 may calculate the path loss estimate according to Equation 4, for example.
  • the RRC message processing unit 1011 reads the path loss difference ⁇ PL included in the PDSCH configuration information element and informs the path loss calculation unit 1012.
  • the PDSCH configuration information element may be defined, for example, in the form shown in Table 7.
  • the path loss calculator 1012 may calculate the path loss prediction value PL according to Equation 10, for example.
  • the path loss calculator 1012 calculates the PUSCH uplink transmission power by substituting the calculated path loss estimate into, for example, Equation 5 or 6 above.
  • the terminal RF unit 1005 transmits the PUSCH to the transceiver point 1050 using the PUSCH uplink transmission power calculated by the path loss calculator 1012.
  • the transmission / reception point 1050 includes a transmission / reception point RF unit 1060 and a transmission / reception point processor 1070.
  • the transceiver point processor 1070 again includes an RRC message processor 1071 and a path loss difference calculator 1072.
  • the transceiver point RF unit 1060 transmits the PDSCH configuration information element, which is an upper layer message generated by the RRC message processing unit 1071, and configuration information about the CSI-RS, to the terminal 1000.
  • the transmitting and receiving point RF unit 1060 generates a lower layer signal CSI-RS, CRS, and transmits to the terminal 1000.
  • the transceiver RF unit 1060 receives the SRS from the terminal 1005.
  • the RRC message processing unit 1071 generates a higher layer message such as a PDSCH configuration information element and configuration information about the CSI-RS.
  • the configuration information about the CSI-RS may include not only the transmission / reception point 1050 but also the downlink reference signal for at least one other transmission / reception point or RRH forming a cooperative multiple transmission / reception point with the transmission / reception point 1050. Include transmit power individually.
  • the path loss difference calculation unit 1072 obtains the result of receiving the SRS from the terminal 1005 from another transmission / reception point (not shown), such as RRH, and estimates the SRS path reduction between the terminal 1000 and the other transmission / reception point SRS_PL2. And an SRS path attenuation estimate SRS_PL1 between the terminal 1000 and the transmission / reception point 1050, and calculates a path attenuation difference ⁇ PL based on SRS_PL1 and SRS_PL2. At this time, the path attenuation difference calculator 1072 calculates a path attenuation difference ⁇ PL using, for example, Equation (7). The path loss difference calculator 1072 then transmits the information about the path loss difference ⁇ PL to the RRC message processor 1071. The RRC message processor 1071 generates a PDSCH configuration information element including a field indicating a path loss difference ⁇ PL.

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Abstract

La présente invention porte sur un appareil et un procédé de commande de puissance d'émission de liaison montante dans un système de communication sans fil. La présente invention décrit en détail un procédé de commande de puissance d'émission de liaison montante, comprenant les étapes consistant à : recevoir des informations de configuration qui indiquent une puissance d'émission d'un signal de référence en provenance d'un point d'émission et de réception ; recevoir le signal de référence en provenance du point d'émission et de réception ; calculer un RSRP au moyen du signal de référence reçu ; calculer une valeur d'atténuation de propagation prédite pour une liaison entre le point d'émission et de réception et le terminal sur la base de la puissance d'émission du signal de référence et du RSRP ; et calculer une puissance d'émission de liaison montante pour le point d'émission et de réception sur la base de la valeur d'atténuation de propagation prédite. Lorsqu'un terminal effectue une transmission en liaison montante vers une pluralité de points d'émission et de réception utilisant le même identificateur de cellule physique, une valeur d'atténuation de propagation prédite avec chaque point d'émission et de réception peut être identifiée de sorte qu'une commande de puissance de liaison montante efficace soit possible.
PCT/KR2012/006381 2011-08-12 2012-08-10 Appareil et procédé de commande de puissance d'émission de liaison montante dans un système de communication sans fil WO2013025014A2 (fr)

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