WO2013100541A1 - Procédé et appareil pour réguler une puissance de transmission dans un système de communication sans fil - Google Patents

Procédé et appareil pour réguler une puissance de transmission dans un système de communication sans fil Download PDF

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Publication number
WO2013100541A1
WO2013100541A1 PCT/KR2012/011434 KR2012011434W WO2013100541A1 WO 2013100541 A1 WO2013100541 A1 WO 2013100541A1 KR 2012011434 W KR2012011434 W KR 2012011434W WO 2013100541 A1 WO2013100541 A1 WO 2013100541A1
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Prior art keywords
power
reference signal
uplink
uplink channel
priority
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PCT/KR2012/011434
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English (en)
Korean (ko)
Inventor
김종남
리지안준
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주식회사 팬택
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • 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
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/281—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account user or data type priority
    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range

Definitions

  • the present invention relates to wireless communications, and more particularly, to a method and apparatus for controlling transmission power in a wireless communication system.
  • MIMO Multiple Input Multiple Output
  • CoMP Cooperative Multiple Point Transmission
  • relay the most basic and stable solution is to increase the bandwidth.
  • a wireless communication system intends to support broadband
  • one or more carriers having a bandwidth smaller than the target broadband may be collected to form a broadband.
  • one or more component carriers are aggregated to support broadband. For example, if one component carrier corresponds to a bandwidth of 5 MHz, four carriers are aggregated to support a maximum bandwidth of 20 MHz.
  • Such a system using carrier aggregation is called a multiple component carrier system.
  • a terminal can simultaneously transmit or receive one or a plurality of carriers according to its capacity.
  • Each independent operating band is defined as a component carrier (CC).
  • CC component carrier
  • a UE transmits a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a sounding reference signal through a plurality of CCs.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • SRS sounding reference signal
  • the UE transmits a PUCCH, PUSCH or SRS on each of a plurality of CCs
  • the transmit power of the PUCCH, PUSCH or SRS may be limited by the maximum transmit power of the UE.
  • the UE should be able to efficiently allocate and / or control the power for the PUCCH, PUSCH, and SRS.
  • the present invention provides a method and apparatus for controlling transmission power in a wireless communication system.
  • Another object of the present invention is to provide an apparatus and a method for performing power scaling when an SRS and another uplink signal are transmitted on a band-served aggregated serving cell.
  • Another technical problem of the present invention is to provide an apparatus and method for performing power scaling according to priority between an SRS and another uplink signal.
  • a power control method by a terminal in a multi-component carrier system belongs to a band different from the first serving cell at a point of time overlapping with a transmission time of a sounding reference signal (SRS), which is a reference signal used to estimate a state of an uplink on the first serving cell.
  • SRS sounding reference signal
  • the sounding reference signal when the sounding reference signal has a higher priority than the uplink channel, power is first assigned to the sounding reference signal and the remaining power is allocated to the uplink channel, and the sounding reference signal is assigned to the uplink channel. If the priority is lower than the link channel, power may be allocated to the uplink channel first, and the remaining power may be allocated to the sounding reference signal.
  • power can be efficiently controlled by sequentially assigning power according to priority, thereby improving performance of a multi-component carrier system. Can be.
  • 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. 5 is a diagram illustrating states of serving cells configured in a terminal in a multi-component carrier system according to an embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating an uplink power control operation by a terminal according to an embodiment of the present invention.
  • FIG. 8 is an explanatory diagram illustrating a method of performing power scaling based on priorities according to an embodiment of the present invention.
  • FIG. 9 is an explanatory diagram illustrating a method of performing power scaling based on priorities according to another embodiment of the present invention.
  • FIG. 10 is an explanatory diagram illustrating a method of performing power scaling based on priority according to another example of the present invention.
  • FIG. 11 is an explanatory diagram illustrating a method of performing power scaling based on priority according to another example of the present invention.
  • FIG. 12 is a flowchart illustrating an uplink power control operation by a terminal according to another embodiment of the present invention.
  • FIG. 13 is a configuration diagram of a terminal 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
  • the term 'transmitting a channel' may be interpreted to mean that information mapped through the channel or mapped to the channel is transmitted.
  • the channel may be, for example, a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH) or a physical channel. It may include a physical uplink shared channel (PUSCH).
  • 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).
  • the user equipment (UE) 12 may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a 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 station that communicates with the terminal 12, and includes an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, an femto eNB, and a home. It may be referred to by other terms such as a base station (HeNB), a relay, a remote radio head (RRH), and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • HeNB base station
  • 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 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 PDCCH includes a resource allocation and transmission format of a downlink shared channel (DL-SCH), resource allocation information of an uplink shared channel (UL-SCH), a random access response message transmitted on a PDSCH, Resource allocation of the same upper layer control message, a set of transmission power control (TPC) commands for individual terminals in a certain terminal group, etc. may be carried.
  • DL-SCH downlink shared channel
  • UL-SCH uplink shared channel
  • TPC transmission power control
  • 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 of PUSCH (Uplink Grant). In particular, it is used for PUSCH scheduling for a
  • 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 the case of a wireless system using Single Carrier-Frequency Division Multiple Access (SC-FDMA) in uplink, the symbol may be an Orthogonal Frequency Division Multiplexing Access (SC-FDMA) symbol.
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • 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 orthogonal frequency division multiple access (OFDMA) symbols, symbol intervals, etc. in addition to the SC-FDMA symbols.
  • OFDMA orthogonal frequency division multiple access
  • One slot includes a plurality of subcarriers in the frequency domain and seven SC-FDMA 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 SC-FDMA symbol, and one slot includes N SC-FDMA 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.
  • a reference signal (RS) known to a terminal and a transceiver is mutually used for channel estimation or channel state measurement.
  • the terminal Since the terminal knows the information of the reference signal, the terminal can estimate the channel based on the received reference signal and compensate the channel value to accurately obtain the data sent from the transmission / reception point.
  • a reference signal is the channel information h
  • the reference signal p is already known by the terminal, when the LS (Least Square) method is used, channel information ( ) Can be estimated.
  • 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.
  • a data transmission amount can be increased.
  • a cell-specific RS CRS
  • a UE-specific RS CRS
  • a positioning reference signal PRS
  • CSI-RS channel state information reference signal
  • 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 thus may be called a demodulation RS (DMRS).
  • 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 channel state information.
  • the CSI-RS is placed in the frequency domain or time domain.
  • Channel quality indicator CQI
  • PMI precoding matrix indicator
  • RI rank indicator rank information
  • CQI channel quality indicator
  • the CSI-RS may be transmitted on one or more antenna ports.
  • DMRS demodulation reference signal
  • SRS sounding reference signal
  • DMRS is associated with transmission of PUSCH or PUCCH
  • SRS is not correlated with PUSCH or PUCCH
  • SRS is a signal that the base station receives from the terminal for use in uplink scheduling.
  • SRS is used in the physical layer and does not carry information originating from higher layers.
  • the SRS may be transmitted in the last symbol of each subframe. With respect to the transmission of the SRS may be configured specifically for the terminal, the SRS may be transmitted periodically (periodic) or aperiodic (aperiodic).
  • the uplink subframe includes two slots on the time axis, and each slot includes seven SC-FDMA symbols.
  • the uplink subframe includes a PUCCH and a PUSCH using different frequencies.
  • the uplink subframe may be divided into a region to which a PUCCH is allocated and a region to which a PUSCH is allocated.
  • UCI uplink control information
  • SR scheduling request
  • ACK / NACK acknowledgment / non-acknowledgement
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indicator
  • PUCCH carries various kinds of control information according to a format. For example, uplink control information having a different number of bits per subframe may be transmitted according to a modulation scheme.
  • 1-bit uplink control information can be transmitted on PUCCH
  • QPSK Quadrature Phase Shift Keying
  • 2-bit uplink control information is PUCCH. Can be sent over the air.
  • PUCCH for one UE uses one resource block occupying a different frequency in each of two slots in a subframe.
  • Two slots use different resource blocks (or subcarriers) in a subframe.
  • Two resource blocks allocated to the PUCCH are said to be frequency hopping at a slot boundary.
  • SRS can be transmitted in the last SC-FDMA symbol interval, the PUCCH in the last SC-FDMA symbol is puncturing.
  • the UE transmits data using 13 SC-FDMA symbols, and performs a preprocessing process such as rate matching for the remaining SC-FDMA symbols and transmits a sounding reference signal.
  • FIG. 5 is a diagram illustrating states of serving cells configured in a terminal in a multi-component carrier system according to an embodiment of the present invention.
  • the system bandwidth includes bands A and B
  • band A includes a main serving cell (PCell) and a first secondary serving cell (SCell 1)
  • band B includes a second secondary serving. It includes a cell (SCell 2) and a third secondary serving cell (SCell 3).
  • the terminal may be configured with any one of the first secondary serving cell and the third secondary serving cell, including a main serving cell.
  • Carrier aggregation of the primary serving cell and the first secondary serving cell is intra-band aggregation.
  • the carrier aggregation of the second secondary serving cell and the third secondary serving cell is the aggregation in the B band.
  • carrier aggregation between the main serving cell and the second secondary serving cell and carrier aggregation between the primary serving cell and the third secondary serving cell are inter-band aggregation.
  • Carrier aggregation between the first secondary serving cell and the second secondary serving cell, and carrier aggregation between the first secondary serving cell and the third secondary serving cell are inter-band aggregation.
  • the system bandwidth includes bands A and B
  • band A includes a main serving cell (PCell) and a first secondary serving cell (SCell 1)
  • band B includes a second secondary serving. It includes a cell (SCell 2) and a third secondary serving cell (SCell 3).
  • a timing difference Td may exist between a band A and a band B in terms of frequency characteristics or a transmission path for a base station.
  • the base station receives a signal of the first secondary serving cell by Td later than a signal of the second secondary serving cell due to a timing difference. . Therefore, the UE should transmit the signal of the first secondary serving cell earlier by Td. This is called timing alignment (TA) to accelerate or lag the uplink transmission.
  • TA timing alignment
  • the SRS in the first secondary serving cell is determined by the second secondary serving cell due to the timing difference. SRS is sent at different times.
  • the SRS in the first secondary serving cell may be transmitted simultaneously with the PUSCH or the PUCCH in the second secondary serving cell, and the PUSCH or the PUCCH in the first secondary serving cell and the SRS in the second secondary serving cell are simultaneously transmitted.
  • the terminal should be able to set the transmission power of the uplink channel and the transmission power of the SRS within the maximum value. This is manifested by uplink power control which sets the amount of power to be allocated to the uplink channel or SRS.
  • FIG. 7 is a flowchart illustrating an uplink power control operation by a terminal according to an embodiment of the present invention.
  • the terminal calculates a transmit power P SRS of an SRS , a transmit power P UL of an uplink channel, and a transmit power P DMRS of a DMRS (S700). It is assumed that an aggregated multi-component carrier is configured in the terminal, and a timing difference exists between the multi-component carriers.
  • the uplink channel includes at least one of a PUCCH and a PUSCH.
  • the terminal is the maximum transmission power of the sum of the total uplink transmission power of the terminal P SRS , P UL and P DMRS It is determined whether to exceed (S705). Where i is the subframe index. If the total uplink transmission power of the terminal is the maximum transmission power If exceeded, the terminal performs power scaling (S710). Increasing or decreasing the transmit power of the uplink channel, the transmit power of the DMRS, or the transmit power of the SRS by a certain ratio is called power scaling. One example of power scaling is to multiply the original transmit power by a scaling factor w. For example, power scaling of P SRS , P UL, and P DMRS results in wP SRS , wP UL, and wP DMRS , respectively.
  • w may have a value of 0 ⁇ w ⁇ 1, and power scaling may be called uplink power control.
  • the power scaling scales the transmit power of one uplink channel, the transmit power of a DMRS, or the transmit power of an SRS, and the transmit power of another uplink channel, the transmit power of a DMRS, or the transmit power of an SRS. It does not scale.
  • the transmit power P SRS of the SRS may be scaled to wP SRS or the transmit power P PUSCH of the PUSCH may be scaled to wP PUSCH .
  • Priority provides a criterion for efficiently allocating limited uplink power to uplink channels, DMRSs, and SRSs.
  • the terminal Scaling the power of the uplink channel, DMRS or SRS based on the priority, the terminal scales the transmission power of the lower priority uplink channel, the transmission power of the DMRS or the transmission power of the SRS, the priority is higher It does not scale the transmission power of the high uplink channel, the transmission power of the DMRS or the transmission power of the SRS. That is, the terminal maintains the first transmission power of the uplink channel having the higher priority, the first transmission power of the DMRS, or the first transmission power of the SRS. And the second transmission power remaining at the maximum transmission power except for the first transmission power is greater than the third transmission power of the uplink channel having the lower priority, the third transmission power of the DMRS, or the third transmission power of the SRS.
  • power is allocated to an uplink channel having a low priority, DMRS or SRS.
  • the terminal allocates zero power to the uplink channel, DMRS or SRS having a lower priority. That is, the UE does not transmit or drop the uplink channel, DMRS or SRS having a lower priority.
  • Priority may be defined in SC-FDMA symbol units or dimensions, or may be defined in subframe units or dimensions.
  • priority is defined based on the type of information transmitted by the SC-FDMA symbol.
  • the type of information transmitted by the SC-FDMA symbol includes data, DMRS, SRS, and the like.
  • the priority in the SC-FDMA symbol dimension may be DMRS> SRS> data.
  • priority is defined based on the type of information transmitted by each subframe.
  • the type of information transmitted in the subframe includes PUSCH, PUCCH, SRS, and the like.
  • the priority may be PUCCH> SRS> PUSCH.
  • the power scaling includes scaling transmission power of all uplink channels and transmission power of SRS by a predetermined ratio.
  • power scaling may be independent of priority. This power scaling is called power scaling based on reduction sharing.
  • the terminal generates an SRS sequence and multiplies the generated sequence of SRS by an amplitude scaling factor ⁇ SRS to conform to the scaled SRS transmission power wP SRS , and multiplies the ⁇ SRS by the SRS.
  • ⁇ SRS amplitude scaling factor
  • a method of scaling the transmission power or the SRS of the uplink channel at a constant rate may be applied.
  • the priority is defined in the SC-FDMA symbol dimension, it is equivalent to the concept that the transmission power is allocated in SC-FDMA symbol units.
  • Types of information transmitted by the SC-FDMA symbol include data, DMRS, SRS, and the like.
  • the priority may be determined based on the reliability of the data transmission.
  • the priority of the SC-FDMA symbol to which DMRS is transmitted is higher than the SC-FDMA symbol to which data is transmitted.
  • the priority in the SC-FDMA symbol dimension may be DMRS> SRS> data. Equations 2 and 3 express power allocation in consideration of priorities in the SC-FDMA symbol dimension.
  • Equation 2 Denotes a linear value of x. therefore, Is the linear value of P CMAX .
  • c is the index of the serving cell
  • P PUCCH PUCCH
  • DMRS is the power of the PUCCH including the DMRS
  • P PUSCH PUCCH
  • DMRS is the power of the PUSCH including the DMRS.
  • the first allocation for the uplink power allocation of the UE and the next for the DMRS of the PUSCH, the next allocation for the DMRS of the PUSCH, the remaining power is scaled by the scaling factor w to the SRS transmission power of each serving cell c Is assigned.
  • SC-FDMA symbols transmitting data not including DMRS are allotted power to data including DMRS and SC-FDMA symbols transmitting SRS, and the remaining power is scaled by a scaling factor w. And is allocated to transmission of PUSCH or PUCCH of each serving cell.
  • the UE may allocate resources independently for each SC-FDMA symbol that is a unit of FFT. Therefore, in a situation where the timing difference between serving cells occurs, in order to use the power available to the UE more efficiently, the unit of power allocation should be defined in symbol units. 8 and 9 are examples of power allocation when Equation 2 and Equation 3 are actually applied.
  • FIG. 8 is an explanatory diagram illustrating a method of performing power scaling based on priorities according to an embodiment of the present invention.
  • a first secondary serving cell SCell 1 and a second secondary serving cell SCell 2 are configured by carrier aggregation in a terminal, and Td is divided between the first secondary serving cell and the second secondary serving cell.
  • Td is divided between the first secondary serving cell and the second secondary serving cell.
  • the SC-FDMA symbol i in which the SRS is transmitted in the first secondary serving cell overlaps the SC-FDMA symbol j in which the PUSCH or PUCCH not including the DMRS is transmitted in the first secondary serving cell.
  • the UE sets the transmit power of the SRS to PSRS and sets the remaining power to the transmit power P DATA of PUSCH or PUCCH.
  • the SC-FMDA symbols j-1, j + 1, etc. which are not transmitted simultaneously with the SRS, the UE sets the transmission power of the PUSCH or the PUCCH to P DATA .
  • One limitation may be applied when allocating remaining power for transmission of the SRS and allocating the remaining power for transmission of the PUSCH or the PUCCH.
  • the modulation scheme of the PUSCH is QPSK
  • the remaining power after transmitting the SRS is allocated to the data transmission of the PUSCH.
  • the modulation scheme of the PUSCH is 16QAM or 64QAM
  • the SRS is allocated and the remaining power is not allocated to the transmission of the PUSCH. Do not.
  • the reason for this is as follows. If the modulation scheme of the PUSCH is QPSK, information is transmitted through the phase and amplitude (magnitude) does not affect the information. As a result, the signal size may be reduced when transmitting with less power, but may not affect information detection.
  • FIG. 9 is an explanatory diagram illustrating a method of performing power scaling based on priorities according to another embodiment of the present invention.
  • the SC-FDMA symbol i in which the SRS is transmitted in the first secondary serving cell overlaps the SC-FDMA symbol j in which the DMRS is transmitted through the PUSCH or the PUCCH in the second secondary serving cell.
  • the UE preferentially allocates power PDMRS to DMRS according to priority and does not allocate power for transmission of SRS. That is, the SRS is punctured or dropped or muted by rate matching or zero power is allocated.
  • FIG. 10 is an explanatory diagram illustrating a method of performing power scaling based on priority according to another example of the present invention.
  • a first secondary serving cell SCell 1 and a second secondary serving cell SCell 2 are configured in one terminal by carrier aggregation, and the first secondary serving cell and the second secondary serving cell are configured. There is a timing difference in uplink time.
  • the index of the last SC-FDMA symbol of subframe n in the first secondary serving cell is i, and this SC-FDMA symbol is located between j-1 and j SC-FDMA symbols of subframe n in the second secondary serving cell. do.
  • the transmission start point of each serving cell is determined in consideration of the transmission delay of the terminal. If the serving cells are configured with carrier aggregation between bands in one terminal, the transmission delay in each band may be different. As shown in FIG. 10, the transmission start point may not match.
  • the priority for example, DMRS> SRS> data
  • the SC-FDMA symbol dimension may be equally applied.
  • the SRS is transmitted in the SC-FDMA symbol i and the DM-1 is not present in the j-1 and j SC-FDMA symbols of the second secondary serving cell which overlaps with the SC-FDMA symbol i simultaneously (PUCCH or PUSCH). ) Is sent.
  • the UE performs power scaling in consideration of the PUSCH required power of the SC-FDMA symbol i-1 of the first secondary serving cell and the PUSCH required power of the SC-FDMA symbol j-1 of the second secondary serving cell
  • the transmission power P j-1 in the SC-FDMA symbol of j-1 is obtained (0 ⁇ w (i) ⁇ 1).
  • the transmission power P j-1 in the SC-FDMA symbol of j-1 is expressed by the following equation.
  • FIG. 11 is an explanatory diagram illustrating a method of performing power scaling based on priority according to another example of the present invention.
  • an SRS is transmitted in an SC-FDMA symbol i in the first secondary serving cell and SC-1 in the second secondary serving cell overlapping with an SC-FDMA symbol i simultaneously.
  • data without a DMRS PUCCH or PUSCH
  • data including a DMRS are transmitted, respectively.
  • the UE performs power scaling in consideration of the PUSCH required power of the SC-FDMA symbol i-1 of the first secondary serving cell and the PUSCH required power of the SC-FDMA symbol j-1 of the second secondary serving cell
  • the transmission power w (i) P 3 of the SC-FDMA symbol of j-1 is obtained (0 ⁇ w (i) ⁇ 1).
  • the UE obtains the scaled SRS transmission power P ′ SRS in consideration of simultaneous transmission of the SRS in the first secondary serving cell and the DMRS in the second secondary serving cell. This is the same as Equation 5.
  • P SRS means the SRS transmission power set before scaling.
  • the transmit power P j-1 in the SC-FDMA symbol of j-1 is represented by the following equation.
  • the priority is defined in the subframe dimension, it is equivalent to the concept that the transmission power is allocated in subframe units. Since data is transmitted in units of one subframe, transmission power is also allocated in units of subframes. Therefore, power scaling should be defined even if the priority is defined in the subframe dimension.
  • power is allocated according to the priority by dividing the SRS and the PUSCH or the SRS and the PUCCH.
  • the transmission of the PUSCH may determine whether the base station receives data transmitted by the terminal through reception of a physical HARQ indicator channel (PHICH), and the terminal may retransmit if the base station does not receive the data.
  • PHICH physical HARQ indicator channel
  • the transmission priority of the SRS may be determined by assigning a higher priority to the PUSCH and then lowering the PUCCH. Accordingly, the power allocation priority between SRS, PUCCH, and PUSCH may be PUSCH ⁇ SRS ⁇ PUCCH.
  • the power allocated to the SRS and PUSCH or PUCCH according to the priority when the different serving cells are maintained in symbol synchronization is It is defined by the following equation.
  • Equations 7 and 8 there is no change in power during one subframe, which is a transmission unit of the channel, in a method according to the priority between the SRS and the channel (PUSCH or PUCCH). That is, when the power required for SRS transmission is allocated in consideration of the priority between the PUCCH and the SRS (Equation 7), and the transmission power of the PUSCH is scaled and allocated according to the remaining power (Equation 8), one sub-sub is maintained. Constant power is maintained during the frame.
  • P subframe n represents the transmission power of subframe n of the second secondary serving cell.
  • the UE since the PUSCH has a lower priority than the SRS, the UE corresponds to the required power of the subframe n of the first secondary serving cell and the subframe n of the second secondary serving cell.
  • w 1 (i) P 1 is a scaling factor that is equally applied to two subframes.
  • w 2 (i) P 2 is calculated according to the required power of subframe n + 1 of the first secondary serving cell and subframe n of the second secondary serving cell.
  • the SRS when SRS and PUSCH or SRS and PUCCH are simultaneously transmitted on different serving cells, the SRS according to the priority when the different serving cells do not maintain symbol synchronization as shown in FIG. 10 or 11
  • power allocated to PUSCH or PUCCH is defined by the following equation.
  • Power scaling based on reduced sharing includes an operation of scaling the transmission power of all uplink channels and the transmission power of SRS by a predetermined ratio. That is, it means that all uplink channels and SRS are shared to participate in power reduction.
  • the terminal prioritizes power allocation to the PUCCH, and the remaining power is allocated to the SRS and the PUSCH at a constant rate by power scaling. This is to give priority to the PUCCH because it requires transmission of higher reliability than SRS and PUSCH. This is expressed as the following equation.
  • the SRS when SRS and PUSCH or SRS and PUCCH are simultaneously transmitted on different serving cells, the SRS is based on a reduced sharing when the different serving cells do not maintain symbol synchronization as shown in FIG. 10 or 11.
  • power allocated to PUSCH or PUCCH is defined by the following equation.
  • the transmission power is allocated in subframe units, and P subframe n represents the transmission power of subframe n of the second secondary serving cell.
  • the UE determines w 1 (i) P 1 according to the required power of subframe n of the first secondary serving cell and subframe n of the second secondary serving cell.
  • w 1 (i) is a scaling factor that is equally applied to two subframes.
  • w 2 (i) P 2 is calculated according to the required power of subframe n + 1 of the first secondary serving cell and subframe n of the second secondary serving cell.
  • the terminal obtains w SRS (i) P SRS according to the required power of the SRS and subframe n of the second secondary serving cell.
  • FIG. 12 is a flowchart illustrating an uplink power control operation by a terminal according to another embodiment of the present invention. This is power scaling based on priority.
  • the terminal recognizes a difference in uplink transmission and timing (S1200).
  • the terminal may be configured with a plurality of serving cells located in different bands, and the plurality of serving cells may be configured by carrier aggregation.
  • the uplink transmission includes a PUSCH or PUCCH transmission that does not include DMRS (called data transmission), a PUSCH or PUCCH transmission that includes DMRS, and an SRS transmission.
  • the terminal determines whether simultaneous transmission of the SRS and another uplink channel occurs (S1205). If the SRS and the other uplink transmission occurs at the same time, the terminal determines whether the other uplink transmission is DMRS (S1210). If the other uplink transmission is DMRS, the terminal preferentially allocates power to DMRS (S1215), for example, allocates power to SRS as shown in Equation 2 (S1220), for example, As described above, power is allocated to the PUSCH or the PUCCH not including the DMRS (S1225).
  • step S1210 if the other uplink transmission is not DMRS, this indicates that the other uplink transmission is data transmission, and thus, the UE preferentially allocates power to the SRS as shown in Equation 2 (S1220), For example, as shown in Equation 3, power is allocated to the PUSCH or the PUCCH not including the DMRS (S1225).
  • step S1205 if simultaneous transmission of the SRS and another uplink channel does not occur, the terminal determines whether data transmission exists (S1230). If data transmission exists, the terminal allocates power to data (S1225). ). If there is no data transmission, the terminal terminates the procedure.
  • FIG. 13 is a configuration diagram of a terminal according to an embodiment of the present invention.
  • the terminal 1400 includes a receiver 1305, a terminal processor 1310, and a transmitter 1320.
  • the terminal processor includes a power controller 1311 and a signal generator 1312.
  • the receiver 1305 receives a downlink signal received from a base station (not shown).
  • the downlink signal includes RRC configuration information related to transmission of DCI and SRS, which are physical layer signals.
  • the power control unit 1311 has a maximum transmission power in which the sum of the total uplink transmission power P SRS , P UL, and P DMRS is added. It is determined whether to exceed the total uplink transmission power of the terminal is the maximum transmission power When exceeding, the terminal performs power scaling.
  • An example of power scaling is as follows.
  • the power controller 1311 may perform power scaling of the SRS, PUSCH, or PUCCH based on the priority.
  • the power control unit 1311 may perform power scaling of the SRSs, PUSCHs, or PUCCHs based on a reduction sharing.
  • the power control unit 1311 may determine the SRS, PUSCH, or PUCCH according to Equation 2 to Equation 6, for example. Perform power scaling.
  • the power control unit 1311 When the power control unit 1311 performs power scaling based on the priority defined in the subframe dimension, the power control unit 1311 performs power scaling of the SRS, PUSCH, or PUCCH according to, for example, Equations 7 to 9 below. Do this.
  • the power control unit 1311 When the power control unit 1311 performs power scaling based on the reduction sharing, the power control unit 1311 performs power scaling of the SRS, PUSCH, or PUCCH, for example, according to Equation 10 or Equation 11.
  • the signal generator 1312 generates an SRS sequence, multiplies the generated sequence of SRSs by a magnitude scaling factor ⁇ SRS to match the SRS transmission power wP SRS scaled by the power controller 1311, and ⁇ ⁇ SRS is After the sequence of the multiplied SRS is sequentially mapped to the resource elements on the antenna port p from r P SRS (0), an SC-FDMA symbol is generated and sent to the transmitter 1320.
  • the transmitter 1320 transmits SC-FDMA symbols generated on the plurality of serving cells to the base station with a timing difference between the serving cells.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention a pour objectif de proposer un procédé et un appareil qui soient aptes à réguler une puissance de transmission dans un système de communication sans fil. Afin d'atteindre l'objectif visé, la présente invention se rapporte à un procédé adapté pour réguler une puissance de transmission. Le procédé selon l'invention comprend l'étape suivante consistant à déterminer si un canal de données sur la liaison montante, qui est transmis à partir d'une seconde cellule de desserte qui appartient à une bande différente de la bande d'une première cellule de desserte, est prioritaire, ou non, par rapport à un signal de référence sonore (SRS) ; ladite détermination est en rapport avec une allocation de puissance à un point dans le temps qui se trouve être en superposition par rapport à une heure de transmission d'un SRS ; et le SRS est un signal de référence qui est utilisé afin d'estimer le statut d'un canal sur la liaison montante dans la première cellule de desserte. Le procédé selon l'invention comprend d'autre part l'étape suivante consistant à réguler la puissance pour le SRS ou le canal sur la liaison montante, sur la base de la priorité déterminée. Dans un environnement de transmission simultanée de SRS et de PUSCH ou de PUCCH parmi une pluralité de composantes porteuses sur la liaison montante, la puissance sur la liaison montante peut être régulée efficacement en allouant la puissance séquentiellement sur la base d'une priorité. De cette manière, il est possible d'améliorer significativement la performance de la pluralité de composantes porteuses.
PCT/KR2012/011434 2011-12-29 2012-12-26 Procédé et appareil pour réguler une puissance de transmission dans un système de communication sans fil WO2013100541A1 (fr)

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CN110474747A (zh) * 2018-05-11 2019-11-19 中兴通讯股份有限公司 一种信号传输方法和装置、及终端
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WO2016019513A1 (fr) * 2014-08-05 2016-02-11 华为技术有限公司 Terminal, dispositif de réseau, et procédé de traitement d'informations de commande de liaison montante
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WO2017039167A1 (fr) * 2015-09-04 2017-03-09 삼성전자 주식회사 Procédé et appareil de gestion de la puissance de transmission en liaison montante dans un système de communication sans fil
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CN109996323A (zh) * 2017-12-29 2019-07-09 中兴通讯股份有限公司 传输的功率确定方法及装置、传输的解调方法及装置
CN110474747A (zh) * 2018-05-11 2019-11-19 中兴通讯股份有限公司 一种信号传输方法和装置、及终端
CN110474747B (zh) * 2018-05-11 2022-01-25 中兴通讯股份有限公司 一种信号传输方法和装置、及终端
US11627599B2 (en) 2018-05-11 2023-04-11 Zte Corporation Method and apparatus for signal transmission, and terminal
CN112805955A (zh) * 2018-10-05 2021-05-14 苹果公司 用于新无线电波束形成系统的物理上行链路信道和信号的发射
CN113993200B (zh) * 2021-12-27 2022-03-18 四川创智联恒科技有限公司 一种5gnr下行信道功率调整方法
CN113993200A (zh) * 2021-12-27 2022-01-28 四川创智联恒科技有限公司 一种5gnr下行信道功率调整方法

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