WO2016122187A1 - Procédé de contrôle de la puissance de liaison montante dans un système d'accès sans fil prenant en charge une bande sans licence, et appareil correspondant - Google Patents

Procédé de contrôle de la puissance de liaison montante dans un système d'accès sans fil prenant en charge une bande sans licence, et appareil correspondant Download PDF

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Publication number
WO2016122187A1
WO2016122187A1 PCT/KR2016/000814 KR2016000814W WO2016122187A1 WO 2016122187 A1 WO2016122187 A1 WO 2016122187A1 KR 2016000814 W KR2016000814 W KR 2016000814W WO 2016122187 A1 WO2016122187 A1 WO 2016122187A1
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Prior art keywords
cell
power
terminal
cells
transmission
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PCT/KR2016/000814
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English (en)
Korean (ko)
Inventor
김선욱
안준기
양석철
이승민
이윤정
황대성
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엘지전자 주식회사
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Publication of WO2016122187A1 publication Critical patent/WO2016122187A1/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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to a wireless access system supporting an unlicensed band, and more particularly, to methods of controlling uplink power and apparatuses for supporting the same.
  • Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • An object of the present invention is to provide methods for efficiently controlling uplink power in a wireless access system supporting an unlicensed band.
  • Another object of the present invention is to provide methods for controlling uplink transmission power used between a licensed band cell and an unlicensed band cell.
  • Still another object of the present invention is to provide methods for controlling transmission power between unlicensed band cells when a terminal transmits an uplink signal through two or more unlicensed band cells.
  • the present invention relates to a wireless access system that supports an unlicensed band, and provides methods for controlling uplink power and apparatuses for supporting the same.
  • a method of performing uplink (UL) power control by a terminal in a wireless access system supporting an unlicensed band includes receiving two or more UL grants including scheduling information and scheduling cells.
  • a licensed band cell (L cell) and an unlicensed band cell (U cell) are included, the sum of the transmit power required by the L cell (P_L), the maximum value of transmit power that can be transmitted by the U cell (P_u) to ensure power value (P_g) and the UE the maximum available transmission power (P CMAX) the based on based on the transmission power, and scheduling information derived from the phase and power control for performing power control in L cells and U cells Each may include transmitting a UL signal.
  • a terminal for performing uplink (UL) power control in a wireless access system supporting an unlicensed band may include a receiver, a transmitter, and a processor for supporting UL power control.
  • the processor controls the receiver to receive two or more UL grants including scheduling information; If the scheduled serving cells include a licensed band cell (L cell) and an unlicensed band cell (U cell), the sum of the transmit power required by the L cell (P_L) and the maximum value of transmit power that can be transmitted by the U cell ( P_u), and a guaranteed power value (P_g) and a terminal U for the cell used to perform power control based on the maximum transmission power value (P CMAX) as possible;
  • the transmitter it may be configured to transmit the UL signal in each of the L cell and the U cell based on the transmission power and the scheduling information derived through the power control.
  • P_u may be always set to a value greater than or equal to P_g regardless of P_L.
  • P_g may be determined as a ratio of the P CMAX.
  • MS may P_g the value in P CMAX first allocated for the cell, and U, the remainder value for the L cells.
  • the mobile station then assigns the P_L P CMAX at first, if the rest of the available power value (P_remain) less than P_g, P_g - may be assigned by the power of the U P_remain cells than the L cells.
  • P_g may be set to a value valid only in a subframe scheduled by two or more UL grants.
  • the UE may perform power scaling down on the transmission powers to be allocated to the U cells so that the transmission powers allocated to the U cells do not exceed P_u.
  • uplink power can be efficiently controlled in a wireless access system supporting an unlicensed band.
  • the uplink transmission power can be efficiently controlled by controlling the uplink transmission power used between the licensed band cell and the unlicensed band cell, and the overall data throughput can be increased.
  • the terminal can efficiently transmit data even when two or more unlicensed band cells are allocated by providing methods for controlling the transmission power between two or more unlicensed band cells.
  • 1 is a diagram illustrating a physical channel and a signal transmission method using the same.
  • FIG. 2 is a diagram illustrating an example of a structure of a radio frame.
  • 3 is a diagram illustrating a resource grid for a downlink slot.
  • FIG. 4 is a diagram illustrating an example of a structure of an uplink subframe.
  • 5 is a diagram illustrating an example of a structure of a downlink subframe.
  • FIG. 6 is a diagram illustrating an example of carrier aggregation used in a component carrier (CC) and LTE_A system.
  • FIG. 7 shows a subframe structure of an LTE-A system according to cross carrier scheduling.
  • FIG. 8 is a diagram illustrating an example of a configuration of a serving cell according to cross carrier scheduling.
  • FIG. 9 is a diagram illustrating one of the SRS transmission methods used in embodiments of the present invention.
  • FIG. 10 is a diagram illustrating an example of a subframe to which a cell specific reference signal (CRS) is allocated, which can be used in embodiments of the present invention.
  • CRS cell specific reference signal
  • FIG. 11 is a diagram illustrating an example of subframes in which CSI-RSs that can be used in embodiments of the present invention are allocated according to the number of antenna ports.
  • FIG. 12 is a diagram illustrating an example in which legacy PDCCH, PDSCH, and E-PDCCH used in an LTE / LTE-A system are multiplexed.
  • FIG. 13 is a diagram illustrating an example of a CA environment supported by an LTE-U system.
  • FIG. 14 is a diagram for describing a case in which cell coverage according to transmission power is set.
  • 15 is a diagram for describing a method of performing power control in an LAA system.
  • 16 is a diagram for describing a power control method between an L cell and a U cell.
  • FIG. 17 is a diagram for describing one of methods for performing power control by considering a transmission power for each U cell.
  • FIG. 18 is a diagram for describing another method of performing power control by considering a transmission power for each U cell.
  • FIG. 19 is a means by which the methods described in FIGS. 1 to 18 may be implemented.
  • the present invention relates to a wireless access system supporting an unlicensed band, and proposes methods for controlling uplink power and apparatuses for supporting the same.
  • each component or feature may be considered to be optional unless otherwise stated.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
  • the base station is meant as a terminal node of a network that directly communicates with a mobile station.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
  • various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station.
  • the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point.
  • a terminal may be a user equipment (UE), a mobile station (MS), a subscriber station (SS), or a mobile subscriber station (MSS). It may be replaced with terms such as a mobile terminal or an advanced mobile station (AMS).
  • UE user equipment
  • MS mobile station
  • SS subscriber station
  • MSS mobile subscriber station
  • AMS advanced mobile station
  • the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service
  • the receiving end refers to a fixed and / or mobile node that receives a data service or a voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the IEEE 802.xx system, the 3rd Generation Partnership Project (3GPP) system, the 3GPP LTE system, and the 3GPP2 system, which are wireless access systems, and in particular, the present invention.
  • Embodiments of the may be supported by 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321 and 3GPP TS 36.331 documents. That is, obvious steps or portions not described among the embodiments of the present invention may be described with reference to the above documents.
  • all terms disclosed in the present document can be described by the above standard document.
  • Transmission Opportunity Period may be used in the same meaning as the term transmission period or RRP (Reserved Resource Period).
  • RRP Reserved Resource Period
  • the LBT process may be performed for the same purpose as a carrier sensing (CS) process for determining whether a channel state is idle.
  • CS carrier sensing
  • 3GPP LTE / LTE-A system will be described as an example of a wireless access system in which embodiments of the present invention can be used.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3GPP Long Term Evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (Advanced) system is an improved system of the 3GPP LTE system.
  • embodiments of the present invention will be described based on the 3GPP LTE / LTE-A system, but can also be applied to IEEE 802.16e / m system and the like.
  • a terminal receives information from a base station through downlink (DL) and transmits information to the base station through uplink (UL).
  • the information transmitted and received by the base station and the terminal includes general data information and various control information, and various physical channels exist according to the type / use of the information they transmit and receive.
  • FIG. 1 is a diagram for explaining physical channels that can be used in embodiments of the present invention and a signal transmission method using the same.
  • the initial cell search operation such as synchronizing with the base station is performed in step S11.
  • the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID.
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information in a cell.
  • PBCH physical broadcast channel
  • the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S12. Specific system information can be obtained.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink control channel
  • the terminal may perform a random access procedure as in steps S13 to S16 to complete the access to the base station.
  • the UE transmits a preamble through a physical random access channel (PRACH) (S13), a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Can be received (S14).
  • PRACH physical random access channel
  • the UE may perform contention resolution such as transmitting an additional physical random access channel signal (S15) and receiving a physical downlink control channel signal and a corresponding physical downlink shared channel signal (S16). Procedure).
  • the UE After performing the above-described procedure, the UE subsequently receives a physical downlink control channel signal and / or a physical downlink shared channel signal (S17) and a physical uplink shared channel (PUSCH) as a general uplink / downlink signal transmission procedure.
  • a transmission (Uplink Shared Channel) signal and / or a Physical Uplink Control Channel (PUCCH) signal may be transmitted (S18).
  • UCI uplink control information
  • HARQ-ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK
  • SR Scheduling Request
  • CQI Channel Quality Indication
  • PMI Precoding Matrix Indication
  • RI Rank Indication
  • UCI is generally transmitted periodically through the PUCCH, but may be transmitted through the PUSCH when control information and traffic data should be transmitted at the same time.
  • the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.
  • FIG. 2 shows a structure of a radio frame used in embodiments of the present invention.
  • the type 1 frame structure can be applied to both full duplex Frequency Division Duplex (FDD) systems and half duplex FDD systems.
  • FDD Frequency Division Duplex
  • One subframe is defined as two consecutive slots, and the i-th subframe includes slots corresponding to 2i and 2i + 1. That is, a radio frame consists of 10 subframes.
  • the time taken to transmit one subframe is called a transmission time interval (TTI).
  • the slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain and a plurality of resource blocks in the frequency domain.
  • One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Since 3GPP LTE uses OFDMA in downlink, the OFDM symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period.
  • a resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.
  • 10 subframes may be used simultaneously for downlink transmission and uplink transmission during each 10ms period. At this time, uplink and downlink transmission are separated in the frequency domain.
  • the terminal cannot transmit and receive at the same time.
  • the structure of the radio frame described above is just one example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slot may be variously changed.
  • Type 2 frame structure is applied to the TDD system.
  • the type 2 frame includes a special subframe consisting of three fields: a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • the DwPTS is used for initial cell search, synchronization or channel estimation in the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • Table 1 below shows the structure of the special frame (length of DwPTS / GP / UpPTS).
  • FIG. 3 is a diagram illustrating a resource grid for a downlink slot that can be used in embodiments of the present invention.
  • one downlink slot includes a plurality of OFDM symbols in the time domain.
  • one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
  • Each element on the resource grid is a resource element, and one resource block includes 12 ⁇ 7 resource elements.
  • the number NDL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 4 shows a structure of an uplink subframe that can be used in embodiments of the present invention.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • the control region is allocated a PUCCH carrying uplink control information.
  • a PUSCH carrying user data is allocated.
  • one UE does not simultaneously transmit a PUCCH and a PUSCH.
  • the PUCCH for one UE is allocated an RB pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots.
  • the RB pair assigned to this PUCCH is said to be frequency hopping at the slot boundary.
  • FIG. 5 shows a structure of a downlink subframe that can be used in embodiments of the present invention.
  • up to three OFDM symbols from the OFDM symbol index 0 in the first slot in the subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which the PDSCH is allocated. to be.
  • a downlink control channel used in 3GPP LTE includes a Physical Control Format Indicator Channel (PCFICH), a PDCCH, and a Physical Hybrid-ARQ Indicator Channel (PHICH).
  • PCFICH Physical Control Format Indicator Channel
  • PDCCH Physical Hybrid-ARQ Indicator Channel
  • PHICH Physical Hybrid-ARQ Indicator Channel
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe.
  • the PHICH is a response channel for the uplink and carries an ACK (Acknowledgement) / NACK (Negative-Acknowledgement) signal for a hybrid automatic repeat request (HARQ).
  • Control information transmitted through the PDCCH is called downlink control information (DCI).
  • the downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group.
  • the PDCCH includes resource allocation and transmission format (ie, DL-Grant) of downlink shared channel (DL-SCH) and resource allocation information (ie, uplink grant (UL-) of uplink shared channel (UL-SCH). Grant)), paging information on a paging channel (PCH), system information on a DL-SCH, and an upper-layer control message such as a random access response transmitted on a PDSCH. It may carry resource allocation, a set of transmission power control commands for individual terminals in a certain terminal group, information on whether Voice over IP (VoIP) is activated or the like.
  • VoIP Voice over IP
  • a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH consists of an aggregation of one or several consecutive control channel elements (CCEs).
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • a plurality of multiplexed PDCCHs for a plurality of terminals may be transmitted in a control region.
  • the PDCCH is composed of one or more consecutive CCE aggregations (CCE aggregation).
  • CCE refers to a unit corresponding to nine sets of REGs consisting of four resource elements.
  • QPSK Quadrature Phase Shift Keying
  • RS reference signal
  • the base station may use ⁇ 1, 2, 4, 8 ⁇ CCEs to configure one PDCCH signal, wherein ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
  • the number of CCEs used for transmission of a specific PDCCH is determined by the base station according to the channel state. For example, one CCE may be sufficient for a PDCCH for a terminal having a good downlink channel state (close to the base station). On the other hand, in case of a UE having a bad channel state (when it is at a cell boundary), eight CCEs may be required for sufficient robustness.
  • the power level of the PDCCH may also be adjusted to match the channel state.
  • Table 2 below shows a PDCCH format, and four PDCCH formats are supported as shown in Table 2 according to the CCE aggregation level.
  • the reason why the CCE aggregation level is different for each UE is because a format or a modulation and coding scheme (MCS) level of control information carried on the PDCCH is different.
  • MCS level refers to a code rate and a modulation order used for data coding.
  • Adaptive MCS levels are used for link adaptation. In general, three to four MCS levels may be considered in a control channel for transmitting control information.
  • control information transmitted through the PDCCH is referred to as downlink control information (DCI).
  • DCI downlink control information
  • the configuration of information carried in the PDCCH payload may vary.
  • the PDCCH payload means an information bit. Table 3 below shows DCI according to DCI format.
  • a DCI format includes a format 0 for PUSCH scheduling, a format 1 for scheduling one PDSCH codeword, a format 1A for compact scheduling of one PDSCH codeword, and a very much DL-SCH.
  • Format 1C for simple scheduling, format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode, format 2A for PDSCH scheduling in open-loop spatial multiplexing mode, for uplink channel
  • Format 3 and 3A for the transmission of Transmission Power Control (TPC) commands.
  • DCI format 1A may be used for PDSCH scheduling, regardless of which transmission mode is configured for the UE.
  • the PDCCH payload length may vary depending on the DCI format.
  • the type and length thereof of the PDCCH payload may vary depending on whether it is a simple scheduling or a transmission mode set in the terminal.
  • the transmission mode may be configured for the UE to receive downlink data through the PDSCH.
  • the downlink data through the PDSCH may include scheduled data, paging, random access response, or broadcast information through BCCH.
  • Downlink data through the PDSCH is related to the DCI format signaled through the PDCCH.
  • the transmission mode may be set semi-statically to the terminal through higher layer signaling (eg, RRC (Radio Resource Control) signaling).
  • the transmission mode may be classified into single antenna transmission or multi-antenna transmission.
  • the terminal is set to a semi-static transmission mode through higher layer signaling.
  • multi-antenna transmission includes transmit diversity, open-loop or closed-loop spatial multiplexing, and multi-user-multiple input multiple outputs.
  • beamforming Transmit diversity is a technique of increasing transmission reliability by transmitting the same data in multiple transmit antennas.
  • Spatial multiplexing is a technology that allows high-speed data transmission without increasing the bandwidth of the system by simultaneously transmitting different data from multiple transmit antennas.
  • Beamforming is a technique of increasing the signal to interference plus noise ratio (SINR) of a signal by applying weights according to channel conditions in multiple antennas.
  • SINR signal to interference plus noise ratio
  • the DCI format is dependent on a transmission mode configured in the terminal (depend on).
  • the UE has a reference DCI format that monitors according to a transmission mode configured for the UE.
  • the transmission mode set in the terminal may have ten transmission modes as follows.
  • transmission mode 1 single antenna port; Port 0
  • Transmission mode 7 Precoding supporting single layer transmission not based on codebook
  • Transmission mode 8 Precoding supporting up to two layers not based on codebook
  • Transmission mode 9 Precoding supporting up to eight layers not based on codebook
  • Transmission mode 10 precoding supporting up to eight layers, used for CoMP, not based on codebook
  • the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
  • a unique identifier for example, a Radio Network Temporary Identifier (RNTI)
  • RNTI Radio Network Temporary Identifier
  • a paging indication identifier (eg, P-RNTI (P-RNTI)) may be masked to the CRC.
  • P-RNTI P-RNTI
  • SI-RNTI System Information RNTI
  • RA-RNTI random access-RNTI
  • the base station performs channel coding on the control information added with the CRC to generate coded data.
  • channel coding may be performed at a code rate according to the MCS level.
  • the base station performs rate matching according to the CCE aggregation level allocated to the PDCCH format, modulates the coded data, and generates modulation symbols.
  • a modulation sequence according to the MCS level can be used.
  • the modulation symbols constituting one PDCCH may have one of 1, 2, 4, and 8 CCE aggregation levels.
  • the base station maps modulation symbols to physical resource elements (CCE to RE mapping).
  • a plurality of PDCCHs may be transmitted in one subframe. That is, the control region of one subframe includes a plurality of CCEs having indices 0 to N CCE, k ⁇ 1.
  • N CCE, k means the total number of CCEs in the control region of the kth subframe.
  • the UE monitors the plurality of PDCCHs in every subframe. Here, monitoring means that the UE attempts to decode each of the PDCCHs according to the monitored PDCCH format.
  • blind decoding refers to a method in which a UE de-masks its UE ID in a CRC portion and then checks the CRC error to determine whether the corresponding PDCCH is its control channel.
  • the UE monitors the PDCCH of every subframe in order to receive data transmitted to the UE.
  • the UE wakes up in the monitoring interval of every DRX cycle and monitors the PDCCH in a subframe corresponding to the monitoring interval.
  • a subframe in which PDCCH monitoring is performed is called a non-DRX subframe.
  • the UE In order to receive the PDCCH transmitted to the UE, the UE must perform blind decoding on all CCEs present in the control region of the non-DRX subframe. Since the UE does not know which PDCCH format is transmitted, it is necessary to decode all PDCCHs at the CCE aggregation level possible until blind decoding of the PDCCH is successful in every non-DRX subframe. Since the UE does not know how many CCEs the PDCCH uses for itself, the UE should attempt detection at all possible CCE aggregation levels until the blind decoding of the PDCCH succeeds.
  • a search space (SS) concept is defined for blind decoding of a terminal.
  • the search space means a PDCCH candidate set for the UE to monitor and may have a different size according to each PDCCH format.
  • the search space may include a common search space (CSS) and a UE-specific / dedicated search space (USS).
  • the UE In the case of the common search space, all terminals can know the size of the common search space, but the terminal specific search space can be set individually for each terminal. Accordingly, the UE must monitor both the UE-specific search space and the common search space in order to decode the PDCCH, thus performing a maximum of 44 blind decoding (BDs) in one subframe. This does not include blind decoding performed according to different CRC values (eg, C-RNTI, P-RNTI, SI-RNTI, RA-RNTI).
  • CRC values eg, C-RNTI, P-RNTI, SI-RNTI, RA-RNTI
  • the base station may not be able to secure the CCE resources for transmitting the PDCCH to all the terminals to transmit the PDCCH in a given subframe. This is because resources remaining after the CCE location is allocated may not be included in the search space of a specific UE.
  • a terminal specific hopping sequence may be applied to the starting point of the terminal specific search space to minimize this barrier that may continue to the next subframe.
  • Table 4 shows the sizes of the common search space and the terminal specific search space.
  • the UE does not simultaneously perform searches according to all defined DCI formats. Specifically, the terminal always performs a search for DCI formats 0 and 1A in the terminal specific search space (USS). In this case, the DCI formats 0 and 1A have the same size, but the UE may distinguish the DCI formats by using a flag used for distinguishing the DCI formats 0 and 1A included in the PDCCH. In addition, a DCI format other than DCI format 0 and DCI format 1A may be required for the UE. Examples of the DCI formats include 1, 1B, and 2.
  • the UE may search for DCI formats 1A and 1C.
  • the UE may be configured to search for DCI format 3 or 3A, and DCI formats 3 and 3A have the same size as DCI formats 0 and 1A, but the UE uses a CRC scrambled by an identifier other than the UE specific identifier.
  • the DCI format can be distinguished.
  • the CCE according to the PDCCH candidate set m of the search space may be determined by Equation 1 below.
  • M (L) represents the number of PDCCH candidates according to CCE aggregation level L for monitoring in search space, to be.
  • N s represents a slot index in a radio frame.
  • the UE monitors both the UE-specific search space and the common search space to decode the PDCCH.
  • the common search space (CSS) supports PDCCHs having an aggregation level of ⁇ 4, 8 ⁇
  • the UE specific search space supports PDCCHs having an aggregation level of ⁇ 1, 2, 4, 8 ⁇ .
  • Table 5 shows PDCCH candidates monitored by the UE.
  • Y k is defined as in Equation 2.
  • CA Carrier Aggregation
  • LTE system 3rd Generation Partnership Project Long Term Evolution (Rel-8 or Rel-9) system
  • MCM multi-carrier modulation
  • CC component carrier
  • Multi-Carrier Modulation is used.
  • LTE-A system a method such as Carrier Aggregation (CA) may be used in which one or more component carriers are combined to support a wider system bandwidth than the LTE system.
  • CA Carrier Aggregation
  • Carrier aggregation may be replaced with the words carrier aggregation, carrier matching, multi-component carrier environment (Multi-CC) or multicarrier environment.
  • the multi-carrier means the aggregation of carriers (or carrier aggregation), wherein the aggregation of carriers means not only merging between contiguous carriers but also merging between non-contiguous carriers.
  • the number of component carriers aggregated between downlink and uplink may be set differently.
  • the case where the number of downlink component carriers (hereinafter referred to as 'DL CC') and the number of uplink component carriers (hereinafter referred to as 'UL CC') is the same is called symmetric merging. This is called asymmetric merging.
  • Such carrier aggregation may be used interchangeably with terms such as carrier aggregation, bandwidth aggregation, spectrum aggregation, and the like.
  • Carrier aggregation in which two or more component carriers are combined, aims to support up to 100 MHz bandwidth in an LTE-A system.
  • the bandwidth of the combining carrier may be limited to the bandwidth used by the existing system to maintain backward compatibility with the existing IMT system.
  • the existing 3GPP LTE system supports ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz bandwidth
  • the 3GPP LTE-advanced system i.e., LTE-A
  • LTE-A 3GPP LTE-advanced system
  • the carrier aggregation system used in the present invention may support carrier aggregation by defining a new bandwidth regardless of the bandwidth used in the existing system.
  • the carrier aggregation may be divided into an intra-band CA and an inter-band CA.
  • Intra-band carrier merging means that a plurality of DL CCs and / or UL CCs are located adjacent to or in proximity to frequency. In other words, it may mean that the carrier frequencies of the DL CCs and / or UL CCs are located in the same band.
  • an environment far from the frequency domain may be referred to as an inter-band CA.
  • the terminal may use a plurality of radio frequency (RF) terminals to perform communication in a carrier aggregation environment.
  • RF radio frequency
  • the LTE-A system uses the concept of a cell to manage radio resources.
  • the carrier aggregation environment described above may be referred to as a multiple cell environment.
  • a cell is defined as a combination of a downlink resource (DL CC) and an uplink resource (UL CC), but the uplink resource is not an essential element. Accordingly, the cell may be configured with only downlink resources or with downlink resources and uplink resources.
  • a specific UE when a specific UE has only one configured serving cell, it may have one DL CC and one UL CC. However, when a specific terminal has two or more configured serving cells, it may have as many DL CCs as the number of cells and the number of UL CCs may be the same or smaller than that. Alternatively, the DL CC and the UL CC may be configured on the contrary. That is, when a specific UE has a plurality of configured serving cells, a carrier aggregation environment in which a UL CC has more than the number of DL CCs may be supported.
  • Carrier coupling may also be understood as the merging of two or more cells, each having a different carrier frequency (center frequency of the cell).
  • the term 'cell' in terms of carrier combining is described in terms of frequency, and should be distinguished from 'cell' as a geographical area covered by a commonly used base station.
  • intra-band carrier merging is referred to as an intra-band multi-cell
  • inter-band carrier merging is referred to as an inter-band multi-cell.
  • the cell used in the LTE-A system includes a primary cell (P cell) and a secondary cell (S cell).
  • the PCell and the SCell may be used as serving cells.
  • the UE that is in the RRC_CONNECTED state but the carrier aggregation is not configured or does not support the carrier aggregation, there is only one serving cell composed of the PCell.
  • one or more serving cells may exist, and the entire serving cell includes a PCell and one or more SCells.
  • Serving cells may be configured through an RRC parameter.
  • PhyS cell Id is a cell's physical layer identifier and has an integer value from 0 to 503.
  • SCell Index is a short identifier used to identify SCell and has an integer value from 1 to 7.
  • ServCellIndex is a short identifier used to identify a serving cell (P cell or S cell) and has an integer value from 0 to 7. A value of 0 is applied to the P cell, and the S cell Index is given in advance to apply to the S cell. That is, a cell having the smallest cell ID (or cell index) in ServCellIndex becomes a P cell.
  • P cell refers to a cell operating on a primary frequency (or primary CC).
  • the UE may be used to perform an initial connection establishment process or to perform a connection re-establishment process, and may also refer to a cell indicated in a handover process.
  • the P cell refers to a cell serving as a center of control-related communication among serving cells configured in a carrier aggregation environment. That is, the terminal may receive and transmit a PUCCH only in its own Pcell, and may use only the Pcell to acquire system information or change a monitoring procedure.
  • E-UTRAN Evolved Universal Terrestrial Radio Access
  • RRC ConnectionReconfigutaion message of a higher layer including mobility control information to a UE supporting a carrier aggregation environment. It may be.
  • the S cell may refer to a cell operating on a secondary frequency (or, secondary CC). Only one PCell may be allocated to a specific UE, and one or more SCells may be allocated.
  • the SCell is configurable after the RRC connection is established and may be used to provide additional radio resources.
  • PUCCH does not exist in the remaining cells excluding the P cell, that is, the S cell, among the serving cells configured in the carrier aggregation environment.
  • the E-UTRAN may provide all system information related to the operation of the related cell in the RRC_CONNECTED state through a dedicated signal.
  • the change of the system information may be controlled by the release and addition of the related SCell, and at this time, an RRC connection reconfigutaion message of a higher layer may be used.
  • the E-UTRAN may transmit specific signaling having different parameters for each terminal, rather than broadcasting in the related SCell.
  • the E-UTRAN may configure a network including one or more Scells in addition to the Pcells initially configured in the connection establishment process.
  • the Pcell and the SCell may operate as respective component carriers.
  • the primary component carrier (PCC) may be used in the same sense as the PCell
  • the secondary component carrier (SCC) may be used in the same sense as the SCell.
  • FIG. 6 is a diagram illustrating an example of carrier aggregation used in a component carrier (CC) and an LTE_A system used in embodiments of the present invention.
  • Component carriers include a DL CC and an UL CC.
  • One component carrier may have a frequency range of 20 MHz.
  • 6 (b) shows a carrier aggregation structure used in the LTE_A system.
  • 6 (b) shows a case where three component carriers having a frequency size of 20 MHz are combined.
  • the number of DL CCs and UL CCs is not limited.
  • the UE may simultaneously monitor three CCs, receive downlink signals / data, and transmit uplink signals / data.
  • the network may allocate M (M ⁇ N) DL CCs to the UE.
  • the UE may monitor only M limited DL CCs and receive a DL signal.
  • the network may assign L (L ⁇ M ⁇ N) DL CCs to allocate a main DL CC to the UE, in which case the UE must monitor the L DL CCs. This method can be equally applied to uplink transmission.
  • the linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource may be indicated by a higher layer message or system information such as an RRC message.
  • a combination of DL resources and UL resources may be configured by a linkage defined by SIB2 (System Information Block Type2).
  • SIB2 System Information Block Type2
  • the linkage may mean a mapping relationship between a DL CC on which a PDCCH carrying a UL grant is transmitted and a UL CC using the UL grant, and a DL CC (or UL CC) and HARQ ACK on which data for HARQ is transmitted. It may mean a mapping relationship between UL CCs (or DL CCs) through which a / NACK signal is transmitted.
  • Cross carrier scheduling may be referred to as Cross Component Carrier Scheduling or Cross Cell Scheduling.
  • Self-scheduling is transmitted through a DL CC in which a PDCCH (DL Grant) and a PDSCH are transmitted in the same DL CC, or a PUSCH transmitted according to a PDCCH (UL Grant) transmitted in a DL CC is linked to a DL CC in which a UL Grant has been received. It means to be.
  • a DL CC in which a PDCCH (DL Grant) and a PDSCH are transmitted to different DL CCs or a UL CC in which a PUSCH transmitted according to a PDCCH (UL Grant) transmitted in a DL CC is linked to a DL CC having received an UL grant This means that it is transmitted through other UL CC.
  • Whether to perform cross-carrier scheduling may be activated or deactivated UE-specifically and may be known for each UE semi-statically through higher layer signaling (eg, RRC signaling).
  • higher layer signaling eg, RRC signaling
  • a carrier indicator field (CIF: Carrier Indicator Field) indicating a PDSCH / PUSCH indicated by the corresponding PDCCH is transmitted to the PDCCH.
  • the PDCCH may allocate PDSCH resource or PUSCH resource to one of a plurality of component carriers using CIF. That is, when the PDCCH on the DL CC allocates PDSCH or PUSCH resources to one of the multi-aggregated DL / UL CC, CIF is set.
  • the DCI format of LTE Release-8 may be extended according to CIF.
  • the set CIF may be fixed as a 3 bit field or the position of the set CIF may be fixed regardless of the DCI format size.
  • the PDCCH structure (same coding and resource mapping based on the same CCE) of LTE Release-8 may be reused.
  • the PDCCH on the DL CC allocates PDSCH resources on the same DL CC or PUSCH resources on a single linked UL CC, CIF is not configured.
  • the same PDCCH structure (same coding and resource mapping based on the same CCE) and DCI format as in LTE Release-8 may be used.
  • the UE When cross carrier scheduling is possible, the UE needs to monitor the PDCCHs for the plurality of DCIs in the control region of the monitoring CC according to the transmission mode and / or bandwidth for each CC. Therefore, it is necessary to configure the search space and PDCCH monitoring that can support this.
  • the terminal DL CC set represents a set of DL CCs scheduled for the terminal to receive a PDSCH
  • the terminal UL CC set represents a set of UL CCs scheduled for the terminal to transmit a PUSCH.
  • the PDCCH monitoring set represents a set of at least one DL CC that performs PDCCH monitoring.
  • the PDCCH monitoring set may be the same as the terminal DL CC set or may be a subset of the terminal DL CC set.
  • the PDCCH monitoring set may include at least one of DL CCs in the terminal DL CC set. Alternatively, the PDCCH monitoring set may be defined separately regardless of the UE DL CC set.
  • the DL CC included in the PDCCH monitoring set may be configured to always enable self-scheduling for the linked UL CC.
  • the UE DL CC set, the UE UL CC set, and the PDCCH monitoring set may be configured UE-specifically, UE group-specifically, or cell-specifically.
  • cross-carrier scheduling When cross-carrier scheduling is deactivated, it means that the PDCCH monitoring set is always the same as the UE DL CC set. In this case, an indication such as separate signaling for the PDCCH monitoring set is not necessary.
  • a PDCCH monitoring set is defined in the terminal DL CC set. That is, in order to schedule PDSCH or PUSCH for the UE, the base station transmits the PDCCH through only the PDCCH monitoring set.
  • FIG. 7 illustrates a subframe structure of an LTE-A system according to cross carrier scheduling used in embodiments of the present invention.
  • DL CC 'A' represents a case in which a PDCCH monitoring DL CC is configured.
  • each DL CC may transmit a PDCCH for scheduling its PDSCH without CIF.
  • the CIF is used through higher layer signaling, only one DL CC 'A' may transmit a PDCCH for scheduling its PDSCH or PDSCH of another CC using the CIF.
  • DL CCs 'B' and 'C' that are not configured as PDCCH monitoring DL CCs do not transmit the PDCCH.
  • FIG. 8 is a diagram illustrating an example of a configuration of a serving cell according to cross carrier scheduling used in embodiments of the present invention.
  • a base station and / or terminals may be composed of one or more serving cells.
  • the base station can support a total of four serving cells, such as A cell, B cell, C cell, and D cell, and terminal A is composed of A cell, B cell, and C cell, and terminal B is B cell, C cell, and the like. It is assumed that the D cell and the terminal C is configured as a B cell. In this case, at least one of the cells configured in each terminal may be configured as a P cell.
  • the PCell is always in an activated state, and the SCell may be activated or deactivated by the base station and / or the terminal.
  • the cell configured in FIG. 8 is a cell capable of adding a cell to a CA based on a measurement report message from a terminal among cells of a base station, and may be configured for each terminal.
  • the configured cell reserves the resources for the ACK / NACK message transmission for the PDSCH signal transmission in advance.
  • An activated cell is a cell configured to transmit a real PDSCH signal and / or a PUSCH signal among configured cells, and performs CSI reporting and SRS (Sounding Reference Signal) transmission.
  • a de-activated cell is a cell configured not to transmit or receive a PDSCH / PUSCH signal by a command or timer operation of a base station, and also stops CSI reporting and SRS transmission.
  • CoMP transmission may be implemented using a carrier aggregation (CA) function in LTE.
  • CA carrier aggregation
  • a carrier operating as a PCell and a carrier operating as an SCell may use the same frequency band as the frequency axis, and are allocated to two geographically separated eNBs.
  • the serving eNB of the UE1 may be allocated to the Pcell, and the neighboring cell which gives a lot of interference may be allocated to the Scell. That is, the base station of the P cell and the base station of the S cell may perform various DL / UL CoMP operations such as joint transmission (JT), CS / CB, and dynamic cell selection with respect to one UE.
  • FIG. 9 shows an example of combining cells managed by two eNBs for one UE (e.g. UE1) as a Pcell and an Scell, respectively.
  • one UE e.g. UE1
  • three or more cells may be combined.
  • some of the three or more cells may be configured to perform a CoMP operation on one terminal in the same frequency band, and other cells to perform a simple CA operation in another frequency band.
  • the Pcell does not necessarily participate in CoMP operation.
  • FIG. 10 is a diagram illustrating an example of a subframe to which a cell specific reference signal (CRS) is allocated, which can be used in embodiments of the present invention.
  • CRS cell specific reference signal
  • CRS 10 shows an allocation structure of a CRS when a system supports four antennas.
  • CRS is used for decoding and channel state measurement. Accordingly, the CRS is transmitted over the entire downlink bandwidth in all downlink subframes in a cell supporting PDSCH transmission, and is transmitted in all antenna ports configured in the eNB.
  • the CRS sequence is mapped to complex-valued modulation symbols used as reference symbols for antenna port p in slot n s .
  • the UE can measure the CSI using the CRS, and can decode the downlink data signal received through the PDSCH in a subframe including the CRS using the CRS. That is, the eNB transmits the CRS at a predetermined position in each RB in all RBs, and the UE detects the PDSCH after performing channel estimation based on the CRS. For example, the UE measures the signal received at the CRS RE. The UE may detect the PDSCH signal from the PD to which the PDSCH is mapped by using a ratio of the reception energy for each CRS RE to the reception energy for each RE to which the PDSCH is mapped.
  • the 3GPP LTE-A system further defines a UE-specific RS (hereinafter, UE-RS) and a channel state information reference signal (CSI-RS) in addition to the CRS.
  • UE-RS is used for demodulation and CSI-RS is used to derive channel state information.
  • UE-RS and CRS are used for demodulation, they can be referred to as demodulation RS in terms of use. That is, the UE-RS may be regarded as a kind of DM-RS (DeModulation Reference Signal).
  • DM-RS Demodulation Reference Signal
  • the CSI-RS and the CRS are used for channel measurement or channel estimation, the CSI-RS and CRS may be referred to as RS for channel state measurement in terms of use.
  • FIG. 11 is a diagram illustrating an example of subframes in which CSI-RSs that can be used in embodiments of the present invention are allocated according to the number of antenna ports.
  • the CSI-RS is a downlink reference signal introduced in the 3GPP LTE-A system not for demodulation purposes but for measuring a state of a wireless channel.
  • the 3GPP LTE-A system defines a plurality of CSI-RS settings for CSI-RS transmission. In subframes in which CSI-RS transmission is configured, the CSI-RS sequence is mapped according to complex modulation symbols used as reference symbols on antenna port p.
  • FIG. 11 (a) shows 20 CSI-RS configurations 0 to 19 available for CSI-RS transmission by two CSI-RS ports among CSI-RS configurations
  • FIG. 11 (b) shows CSI-RS configurations. Of the configurations, 10 CSI-RS configurations available through four CSI-RS ports 0 through 9 are shown, and FIG. 11 (c) shows 5 available by eight CSI-RS ports among the CSI-RS configurations. Branch CSI-RS configuration 0-4 are shown.
  • the CSI-RS port means an antenna port configured for CSI-RS transmission. Since the CSI-RS configuration varies depending on the number of CSI-RS ports, even if the CSI-RS configuration numbers are the same, different CSI-RS configurations are obtained when the number of antenna ports configured for CSI-RS transmission is different.
  • the CSI-RS is configured to be transmitted every predetermined transmission period corresponding to a plurality of subframes. Therefore, the CSI-RS configuration depends not only on the positions of REs occupied by the CSI-RS in a resource block pair but also on the subframe in which the CSI-RS is configured.
  • the CSI-RS configuration may be regarded as different. For example, if the CSI-RS transmission period (T CSI-RS ) is different or the start subframe ( ⁇ CSI-RS ) configured for CSI-RS transmission in one radio frame is different, the CSI-RS configuration may be different.
  • the CSI-RS configuration depends on (1) the CSI-RS configuration to which the CSI-RS configuration number is assigned, and (2) the CSI-RS configuration number, the number of CSI-RS ports, and / or subframes in which the CSI-RS is configured.
  • the configuration of the latter 2 is called a CSI-RS resource configuration.
  • the setting of the former 1 is also referred to as CSI-RS configuration or CSI-RS pattern.
  • eNB informs UE of CSI-RS resource configuration
  • the number of antenna ports, CSI-RS pattern, CSI-RS subframe configuration I CSI-RS , CSI used for transmission of CSI-RSs UE assumption on reference PDSCH transmitted power for feedback (CSI) can be informed about P c , zero power CSI-RS configuration list, zero power CSI-RS subframe configuration, etc. .
  • I CSI-RS is information for specifying the subframe configuration period T CSI-RS and subframe offset ⁇ CSI-RS for the presence of CSI-RSs .
  • Table 4 illustrates CSI-RS subframe configuration index I CSI-RS according to T CSI-RS and ⁇ CSI-RS .
  • CSI-RS-SubframeConfig I CSI-RS CSI-RS periodicity T CSI-RS (subframes) CSI-RS subframe offset ⁇ CSI-RS (subframes) 0-4 5 I CSI-RS 5-14 10 I CSI-RS -5 15-34 20 I CSI-RS -15 35-74 40 I CSI-RS -35 75-154 80 I CSI-RS -75
  • subframes satisfying Equation 3 below are subframes including the CSI-RS.
  • UE set to a transmission mode defined after 3GPP LTE-A system performs channel measurement using CSI-RS and PDSCH using UE-RS Can be decoded.
  • UE set to a transmission mode defined after 3GPP LTE-A system performs channel measurement using CSI-RS and PDSCH using UE-RS Can be decoded.
  • a cross carrier scheduling (CCS) operation in a combined situation for a plurality of component carrier (CC) cells
  • CC cross carrier scheduling
  • the scheduled CC may be preset to receive DL / UL scheduling only from another scheduling CC (ie, to receive a DL / UL grant PDCCH for the scheduled CC).
  • the scheduling CC may basically perform DL / UL scheduling on itself.
  • the number of OFDM symbols used for transmission of control channels in each subframe may be delivered to the UE dynamically through a physical channel such as PCFICH or in a semi-static manner through RRC signaling.
  • the PDCCH which is a physical channel for transmitting DL / UL scheduling and various control information, has a limitation such as being transmitted through limited OFDM symbols.
  • the PDCCH is transmitted through an OFDM symbol separate from the PDSCH, such as a PDCCH.
  • An extended PDCCH ie E-PDCCH
  • FIG. 12 is a diagram illustrating an example in which legacy PDCCH, PDSCH, and E-PDCCH used in an LTE / LTE-A system are multiplexed.
  • cooperative operations may be performed between network entities. For example, during a particular subframe in which Cell A transmits data, cells other than Cell A transmit only common control information, but do not transmit data, thereby minimizing interference to users receiving data in Cell A. can do.
  • the UE may perform a resource-restricted measurement (RRM) operation.
  • RRM resource-restricted measurement
  • Table 7 below shows an example of a higher layer signal for setting a CSI subframe set.
  • Table 7 shows an example of a CQI-Report Cofig message transmitted to set a CSI subframe set.
  • the CQI report configuration message includes aperiodic CQI report (cqi-ReportAperiodic-r10) IE, nomPDSCH-RS-EPRE-Offset IE, periodic CQI report (cqi-ReportPeriodci-r10) IE, PMI-RI report (pmi-RI- Report-r9) IE and CSI subframe pattern configuration (csi-subframePatternConfig) IE may be included.
  • the CSI subframe pattern configuration IE includes a CSI measurement subframe set 1 information (csi-MeasSubframeSet1) IE and a CSI measurement subframe set 2 information (csi-MeasSubframeSet2) IE indicating a measurement subframe pattern for each subframe set.
  • the CSI measurement subframe set 1 (csi-MeasSubframeSet1-r10) information element (IE) and the CSI measurement subframe set 2 (csi-MeasSubframeSet2-r10) IE are 40 bit bitmap information and belong to each subframe set. Represents information about a subframe.
  • the aperiodic CQI report (CQI-ReportAperiodic-r10) IE is an IE for performing the setting for aperiodic CQI reporting to the terminal
  • the periodic CQI report (CQI-ReportPeriodic-r10) IE is set for the periodic CQI reporting IE is done.
  • nomPDSCH-RS-EPRE-Offset IE Indicates a value. At this time, the actual value is Value * 2 is set to [dB].
  • the PMI-RI Report IE indicates that PMI / IR reporting is configured or not. EUTRAN configures the PMI-RI Report IE only when the transmission mode is set to TM8, 9 or 10.
  • the LTE-U system refers to an LTE system supporting CA conditions of the licensed band and the unlicensed band.
  • the unlicensed band may be a Wi-Fi band or a Bluetooth (BT) band.
  • FIG. 13 is a diagram illustrating an example of a CA environment supported by the LTE-U system.
  • CCs component carriers
  • a licensed CC (LCC: Licensed CC) is a major carrier (can be referred to as a primary CC (PCC or PCell)), an unlicensed carrier (Unlicensed CC: UCC) is a sub-carrier Assume a case of (Secondary CC: SCC or S cell).
  • LCC Licensed CC
  • UCC unlicensed carrier
  • embodiments of the present invention may be extended to a situation in which a plurality of licensed bands and a plurality of unlicensed bands are used in a carrier combining method.
  • the proposed schemes of the present invention can be extended to not only 3GPP LTE system but also other system.
  • FIG. 13 illustrates a case in which one base station supports both a licensed band and an unlicensed band. That is, the terminal can transmit and receive control information and data through a PCC, which is a licensed band, and can also transmit and receive control information and data through an SCC, which is an unlicensed band.
  • a PCC which is a licensed band
  • SCC which is an unlicensed band
  • the terminal may configure a P-cell and a macro base station (M-eNB: Macro eNB) and a small cell (S-eNB: Small eNB) and an S cell.
  • M-eNB Macro eNB
  • S-eNB Small eNB
  • the macro base station and the small base station may be connected through a backhaul network.
  • the unlicensed band may be operated in a contention based random access scheme.
  • an eNB and / or a transmission point (TP) supporting an unlicensed band may first perform a carrier sensing (CS) process before data transmission and reception.
  • the CS process is a process of determining whether the corresponding band is occupied by another entity.
  • the base station eNB and / or TP of the SCell checks whether the current channel is busy or idle. If it is determined that the corresponding band is idle, the base station and / or the TP is a scheduling grant through the (E) PDCCH of the Pcell in the case of the cross carrier scheduling scheme or the PDCCH of the Scell in the case of the self scheduling scheme. Transmits to the terminal to allocate resources, and may attempt to transmit and receive data.
  • the CS process may be performed the same as or similar to that of the List Before Talk (LBT) process.
  • the LBT process is a process in which a base station of a Pcell checks whether a current state of a Ucell (a cell operating in an unlicensed band) is busy or idle. For example, when there is a clear channel assessment (CCA) threshold set by a preset or higher layer signal, when an energy higher than the CCA threshold is detected in the U-cell, it is determined to be busy or otherwise idle. do.
  • CCA clear channel assessment
  • the base station of the Pcell transmits a scheduling grant (ie, DCI, etc.) through the (E) PDCCH of the Pcell or through the PDCCH of the Ucell to schedule resources for the Ucell.
  • the data can be transmitted and received through the U cell.
  • the base station and / or the TP may set a transmission opportunity (TxOP) section consisting of M consecutive subframes.
  • TxOP transmission opportunity
  • the base station may inform the UE of the M value and the use of the M subframes in advance through a higher layer signal, a physical control channel, or a physical data channel through a Pcell.
  • a TxOP period consisting of M subframes may be called a reserved resource period (RRP).
  • the terminal determines the transmission power in transmitting UL signals (eg, uplink data (PUSCH), reference signal (RS) and / or control signal (SRS, PUCCH), etc.) to the base station How to do this is described.
  • UL signals eg, uplink data (PUSCH), reference signal (RS) and / or control signal (SRS, PUCCH), etc.
  • FIG. 14 is a diagram for describing a case in which cell coverage according to transmission power is set.
  • the solid line indicates coverage when the transmission power P1 and the dotted line indicates the coverage when the transmission power P2.
  • the UE is geographically located near the base station eNB while being relatively far from the WiFi AP.
  • the UE located near the eNB successful signal transmission is possible even with a smaller power than the cell edge UE in the UL transmission.
  • a relatively low power is allocated to a UE located near an eNB through power control in order to reduce battery consumption of the UE.
  • the UE may be vulnerable to a hidden node problem by reducing the transmission power of the UE.
  • the WiFi AP that detects the data transmission may not attempt to transmit, but the UE transmits using the power of P1 ( ⁇ P2). If the WiFi AP does not detect the transmission, it may attempt to transmit in the unlicensed band. This may cause severe interference from the eNB's point of view, and the eNB may not successfully receive data transmitted by the UE. In order to reduce such a hidden node problem, it may be advantageous in the LAA system not to significantly reduce the UL transmission power through power control even for a UE located near the eNB.
  • 15 is a diagram for describing a method of performing power control in an LAA system.
  • resource scheduling including power control may use a self carrier scheduling (SCS) scheme or a cross carrier scheduling (CCS) scheme.
  • SCS self carrier scheduling
  • CCS cross carrier scheduling
  • FIG. 15A when both Ucell1 and Ucell2 are determined to be in an idle state, the UE may perform UL transmission for both Ucells that have received the UL grant.
  • FIG. 15B when the Ucell1 is in the idle state and the Ucell2 is in the busy state, the UE may not perform the UL signal transmission even if the UE has received the UL grant for the Ucell2.
  • the power value required for the UL signal transmission in the Ucell1 or the Ucell2 that receives the UL grant is defined as P_u1 or P_u2.
  • the UE may transmit a UL signal using the power of P_u1 in U cell 1 and a UL signal using the power of P_u2 in U cell 2 at SF # n + 4.
  • the UE may not transmit the UE2.
  • Embodiments of the present invention can be applied to the case of carrier combination of an L cell defined in the license band and a U cell defined in the unlicensed band.
  • a general carrier combining technique of primary and secondary cells supported by the same or different base stations, and a DC in which one terminal is connected to two or more serving cells managed by separate base stations In the dual connectivity technology, there is a carrier coupling technology between a master cell group (MCG) and a secondary cell group (SCG).
  • MCG master cell group
  • SCG secondary cell group
  • the terminal may transmit the UL signal by controlling the transmission power of the Pcell and the Scell based on the power information transmitted from the base station.
  • the terminal since both the Pcell and the Scell (or MCG and SCG) operate in the license band and the processing time (for example, 1ms) for determining the UL transmission power is guaranteed, the terminal transmit power of the Pcell and the Scell. There's enough time to handle it.
  • a CS process or CCA, LBT process, etc.
  • a CS process performed in an unlicensed band is performed for a very short time (a few tens of us). Since it may be difficult to ensure the processing time for calculating the UL transmission power for the terminal to perform the UL signal transmission.
  • an LTE / LTE-A system supporting a licensed band takes about 1 ms in processing time for determining UL transmission power. Therefore, when considering the operation characteristics of the unlicensed band in which signal transmission is determined depending on whether the channel is idle or busy during the CCA process (or CS process, LBT process, etc.) of several tens of us, Accordingly, it may be practically difficult to calculate and apply UL transmit power immediately for each serving cell.
  • the UE since the U cell 2 is busy as shown in FIG. 15 (b), the UE does not need to use the power of P_u2 preset for the U cell 2, so that the UE uses the corresponding power (ie, P_u2) as the U cell. It may not be possible to utilize 1 or L cell.
  • Embodiments of the present invention relate to power control methods for unlicensed UL transmission, and may be particularly applicable to power limited cases.
  • P_u is defined as the maximum amount of power available in one or more U-cells at a specific time in view of a specific UE. If the UE receives the U cell that has received the UL grant at that time, the U cell 1 and the U cell 2, P_u1 + P_u2> P_u is defined as a power limit case. In other words, when P_sum is defined as “the sum of transmit powers required for UL signal transmission of one or more U cells,” P_sum> P_u corresponds to a power limit case.
  • the UE performs power scale down assuming that the UE transmits UL signals in all U cells, not only may it be vulnerable to the hidden node problem described in FIG. 14, but also a CCA result. Accordingly, it may not be able to transmit the UL signal in all U cells. In addition, in consideration of the power processing time, it is also practically impossible to utilize the power of the U cell, which is not transmitted by the terminal, in the transmission of the UL signal for other cells.
  • Embodiments of the present invention intend to propose a power control method for the UL signal transmission in the LAA system to solve this problem.
  • the UE may be configured to simultaneously perform UL signal transmission for one or more licensed band cells (Lcell) and one or more unlicensed band cells (Ucell) at a specific time. For example, a UL carrier coupling (CA) situation may occur between one or more Lcells and Ucells.
  • CA UL carrier coupling
  • methods for allocating transmission power between one or more L cells and one or more U cells will be described. However, for convenience of description, it will be described assuming one L cell and one U cell, but the technical features described below may be equally applicable to a situation in which a plurality of L cells and a plurality of U cells are carrier coupled.
  • the terminal may be configured to allocate the transmission power for the L cell first, and then utilize the remaining power in the U cell.
  • the sum of the transmission power required for UL signal transmission in all L cells that receive the UL grant including uplink scheduling information is defined as P_L, and the maximum output power available to the terminal at the time of UL signal transmission Define maximum output power as P CMAX .
  • the UE allocates the transmit power of the L cell first and then utilizes only the remaining power in the U cell, if the P_L value is large, UL transmission is not possible in the U cell because there is no remaining power even if the UL grant for the U cell is received. Even when transmitting, only a very low power can be tolerated. Therefore, in order to compensate for this, the U cells may be set so that a certain power is always guaranteed. This can be defined as guaranteed power.
  • the UE can always guarantee a certain level of power for the UL signal transmission in the U-cell.
  • methods for calculating guaranteed power will be described.
  • a particular serving cell may be set as an exception.
  • the UE simultaneously transmits an UL signal in the cell #x and the U cell (for example, PUCCH transmission and / or PUSCH on Cell # x) For reasons such as UCI piggyback), the guaranteed power for the U cell may not be guaranteed.
  • P_g may be set to a valid value only for SF scheduled by receiving the UL grant for the Ucell.
  • the UE may have no UL signal to transmit to the U cell at SF # n + 3 and an UL signal to transmit to the U cell at SF # n + 4.
  • the terminal may consider only the P value CMAX without considering the value P_g SF # n + 3 has received UL scheduling grant to perform a UL power control for the L cells.
  • SF # n + 4 in P_L value is received through the UL Scheduling Grant may perform the UL power control for the L cells so as not to exceed CMAX P_g ⁇ P ⁇ .
  • the embodiments to be described below will be described on the assumption that there are several UL transmission power values preset for each serving cell, and that the UE can select and transmit one transmission power among various values according to a specific situation.
  • the UE may use the remaining power allocated to the Ucells that do not perform UL transmission because of the busy state of the CCA in other cells (eg, Lcell and / or Ucell).
  • L cells are scheduled to two or more terminals in FIG. 15, and may be set to L cell 1, L cell 2, L cell 3,.
  • the UE transmits the Lcell according to whether the UE transmits the UL signal in Ucell1.
  • Two power values of 2 can be set in advance. For example, if the UE determines that the channel state of Ucell1 is busy at time of SF # n + 4 and does not transmit the UL signal, the UE may allocate more UL transmit power to Lcell2. If the channel state of the Ucell1 is determined to be idle, the UE may attempt to transmit the UL signal by allocating the UL transmission power to the Ucell1 and the Lcell2. This method can be extended even in a situation where several U cells are scheduled at the same time.
  • the UE pre-transmits four transmit power values for Lcell2 according to a combination according to whether UL signals are transmitted to each Ucell. You can set it.
  • the UE may preset the transmission power value for the UL signal transmission in the Ucell2 according to whether or not the UL signal is transmitted in the Ucell1.
  • these methods can be extended and applied in a situation where several L cells and several U cells are scheduled at the same time. If the Lcell2, the Lcell3 and the Ucell1 are scheduled to the UE at the same time, the UE previously sets two or more UL transmit power values according to the combination according to whether or not the UL signal is transmitted from the Ucell1 to the Lcell2 and Each can be set in Lcell3. For example, if the Ucell1 is busy and the terminal does not transmit the UL signal through the Ucell1, the UE equally distributes the transmission power values set on the Ucell1 to the Lcell2 and the Lcell. It can be set to assign to three.
  • 16 is a diagram for describing a power control method between an L cell and a U cell.
  • FIG. 16 illustrates a transmission power control method between the L cell and the U cell described in Section 4.2 from a terminal perspective.
  • P_u value means the sum of the transmission power required for the UL signal transmission in the U cells scheduled by the terminal or the maximum value of the amount of transmission power available in the U cell
  • P_g is the U cells scheduled by the terminal The sum of the transmission powers guaranteed by
  • the terminal may receive one or more UL grants in SF # n.
  • the one or more UL grants may be UL grants related to one or more L cells and / or U cells (S1610).
  • the terminal may identify which serving cell the scheduled serving cell is. For example, the UE may check the scheduled L-cell and U-cell (S1620).
  • the processor of the terminal calculates the guaranteed power P_g guaranteed in the U cell. Thereafter, the processor of the terminal compares the P_u value required for U cell transmission with the guaranteed power P_g value of the U cell (S1630).
  • step S1630 if the P_u value is greater than or equal to the P_g value, the UE may perform power control using the P_L value and the P_u value required for UL signal transmission in the L cell (S1640).
  • step S1630 if the P_u value is less than the P_g value, the UE may perform power control using the P_L value and P_g value required for the UL signal transmission in the L cell.
  • the terminal assignment for the cells U P_g first value in the maximum transmission power P CMAX a terminal is used by the method described above in Section 4.2.1, the first to fourth methods, and the remaining values for L cells Can be assigned (S1650).
  • the terminal may be assigned a power of as much as after allocating P_L in P CMAX first, one if the remaining power level (P_remain) is less than P_g, P_g-P_remain soluble in U-cell non-L cells .
  • step S1620 when the UE is scheduled only for the L cell without the U cell, the terminal may perform power control for the L cell using P_L (S1660, S1670).
  • the P_L and P_u values can be calculated by the methods described in Section 4.2.
  • the P_u value which is the sum of the amount of power that the UE can transmit on the U cells, may have one of the following values.
  • the following embodiments are for UL transmit power control methods for U cells in a power limited case when P_u value is given as (1) or (2).
  • the UE After allocating UL transmit power for all U cells that have received (ie, scheduled) UL grants, the UE scales the power so that the sum of UL transmit powers for U cells does not exceed P_u in a power limiting case where P_sum> P_u. You can do the down. In this case, power scaling down may be collectively performed on the transmission power of all U cells.
  • the terminal may perform power scaling down on each U cell by using the determined w value.
  • the UE may transmit a UL signal with a w * P_u1 value for the Ucell1 and a UL signal with a w * P_u2 value for the Ucell2.
  • the UE transmits a UL signal with a transmit power of w * P_u1 on Ucell1, but does not use w * P_u2 allocated to Ucell2 because Ucell2 is busy.
  • the UL transmission can be given without.
  • the UE After all, the UE performs power scaling down assuming that the scheduled Ucell1 and the Ucell2 can transmit UL signals. However, when a channel of a Ucell is busy due to CCA, the UE is assigned a transmit power. Even if it is possible to drop the transmission of the UL signal. Accordingly, the UE may be configured to perform power control (or power scaling) based on all scheduled U cells, not allocating transmit power only to U cells performing actual transmission.
  • the terminal may need to scale down too much power.
  • the transmission power for the U cell since the transmission power for the U cell is weakened, it may be exposed to a hidden node problem.
  • the terminal may be pre-assigned a power scaling threshold T through higher layer signaling.
  • the power required for UL signal transmission in a specific Ucellx is defined as P_ux.
  • the power scaling threshold T means a maximum ratio value that can power down P_ux. That is, if the UE sets the UL transmit power lower than T * P_ux in the Ucellx, this means that a hidden node problem may occur.
  • the UE may perform power scale down as described in Section 4.3.1. On the other hand, if P_u ⁇ T * P_sum, the UE may give up UL signal transmission on all scheduled Ucells.
  • the transmit power threshold T may be set to a minimum transmit power value rather than a ratio value.
  • the UE can perform CCA and UL signal transmission only when P_ux used in a specific Ucellx is equal to or greater than the T value.
  • power scaling down may be set to not allow for transmitting UL signals in U cells. For example, even in the case of P_u1 + P_u2> P_u in the example of FIG. 15, the terminal does not perform power scaling down. In this case, it is assumed that P_u1 and P_u2 are smaller than P_u, respectively.
  • the UE may drop the UL transmission on all Ucells. If only one U cell of the two cells is in an idle state as shown in FIG. 15B, the UE may transmit a UL signal using P_u1 in the U cell 1 and stop the UL transmission in the U cell 2. If Ucell1 is busy and Ucell2 is idle, the UE may transmit a UL signal using P_u2 in Ucell2.
  • the UE uses the power scaled down UL transmission power such as w * P_u1 or w * P_u2 when transmitting the UL signal. Compared to the method, smaller transmission power can be used.
  • the UE may be configured to select one of the Ucells and perform UL signal transmission. This is because P_u1 + P_u2> P_u, and it is practically impossible to redistribute power in the same manner as in Sections 4.3.1 to 4.3.2 for several tens of CCA hours.
  • the terminal may not perform transmission power scaling down even in a power limited case. For example, when the total sum of powers for UL signal transmission is smaller than P_u in several U cells that are idle as a result of CCA, the UE may transmit a UL signal using power allocated for the corresponding U cells. However, when the total sum of powers for the UL signal transmission is greater than P_u, the UE may drop the UL transmission in some of the corresponding U cells and transmit the UL signal using the preset power in some.
  • the UE determines whether to transmit or drop the UL signal in the Ucells as follows.
  • the UE may randomly select only one U cell among idle U cells among scheduled U cells, or may arbitrarily select several U cells until the total sum of transmission powers is not greater than P_u.
  • the maximum number of U cells that can be transmitted to the UL at a corresponding time by higher layer signaling may be preset.
  • the UE may arbitrarily select up to K U cells until the sum of the transmit powers used in the U cells is not greater than P_u, and transmit a UL signal through the selected U cells.
  • Power required for UL signal transmission in a specific Ucellx may be defined as P_ux.
  • the UE may select only one U cell x having the largest P_ux and transmit a UL signal.
  • the terminal may sort in descending order (or ascending order) in P_ux order, and select a maximum number of U cells in which the total sum of the transmit powers of the selected U cells does not become larger than P_u.
  • the maximum number of U cells that can be transmitted to the UL at that time (for example, K) is set in advance by a higher layer signal (eg, RRC, etc.), when the terminal is not larger than P_u Up to K U cells can be selected up to (in the order of U cells sorted in P_ux order).
  • Priorities for the Ucells may be defined in advance by higher layer signaling.
  • the priority of Ucell2 may be set higher than that of Ucell1 in FIG. 15. In this case, when both Ucell1 and Ucell2 are idle, the terminal may select the Ucell1 having the highest priority and transmit the UL signal.
  • the terminal selects the U cells in the order of high priority, but until the sum of transmit powers does not exceed P_u (up to K if K is set). ) You can choose.
  • method 1 or method 2 may be followed.
  • the terminal may drop transmission of the corresponding U cells.
  • the terminal may be configured to drop the UL transmission in all the Ucells.
  • the methods (1) to (3) can be extended even if they are not in the power limiting case.
  • A-SRS aperiodic SRS
  • the A-SRS trigger is set to '10', the Ucell3 It can indicate that the UE transmits the A-SRS through the Ucell4.
  • the UE may transmit the SRS only when it is in an idle state according to the CCA result for each U cell, so that specifying the U cell index in advance may not be significant. Therefore, by specifying only the number of U cells to transmit the UL signal, it may be preferable that the UE is configured to transmit SRS only for the K U cells that can transmit the CCA result among the scheduled U cells.
  • the number of U cells scheduled by the UE is M (> K), and the transmission power P_sum required for transmitting UL signals through all M U cells is smaller than P_u.
  • the methods of section 4.3.3 may not apply on Ucells that can transmit without LBT.
  • the UE in FIG. 15, if the UE is continuously transmitting UL signals from SF # n + 3, which is before SF # n + 4 in Ucell1, the UE transmits UL signals in SF # n + 4 without LBT. Can be.
  • the UE may transmit a UL signal without LBT.
  • the terminal is described in Section 4.3.3.
  • CCA may not be performed for the Ucellx after excluding the aforementioned methods from power control in advance. That is, the terminal may be configured to perform the methods described in Sections 4.3.1 to 4.3.3 above only for U cells whose P_ux is not greater than P_u.
  • FIG. 17 is a diagram for describing one of methods for performing power control by considering a transmission power for each U cell.
  • the terminal may be scheduled for UL of one or more Ucellx (S1710).
  • the terminal compares the total power P_u of the transmission power of the corresponding Ucellx and the transmission power required for all scheduled Ucells (S1720).
  • the UE may perform power control for the corresponding Ucellx by applying the methods performed in Sections 4.3.1 to 4.3.3 (S1730).
  • step S1720 if P_ux> P_u, the UE does not perform a CCA (or CS, LBT, etc.) process in the Ucellx and does not perform UL transmission (S1740).
  • CCA or CS, LBT, etc.
  • FIG. 18 is a diagram for describing another method of performing power control by considering a transmission power for each U cell.
  • the UE may be assigned a power scale threshold T previously defined by higher layer signaling similarly to the method described in Section 4.3.2.
  • the UE may use the allocated power scale threshold T as a scaling factor without excluding all Ucellx from UL power control because P_ux is greater than P_u.
  • the terminal may be scheduled for UL of one or more Ucellx (S1810).
  • the terminal compares the total power P_u of the transmission power of the corresponding Ucellx and the transmission power required for all scheduled Ucells (S1820).
  • the UE may perform power control on the corresponding Ucellx by applying the methods performed in Sections 4.3.1 to 4.3.3 (S1840).
  • step S1820 if P_ux> P_u, the terminal compares the scaled T * P_ux value with P_u using the received power scale threshold T (S1840).
  • the terminal may use the T * P_ux value as the UL transmission power for the Ucellx. That is, the UE may perform power control by applying the methods described in Sections 4.3.1 to 4.3.3 based on the T * P_ux value (S1850).
  • T * P_ux> P_u the UE does not perform the CCA (or CS, LBT, etc.) process in the Ucellx and also does not perform UL transmission (S1860).
  • the UE may exclude P_ux value from the U-cell power control in advance. In this case, a case where UL signal transmission is impossible on all U cells scheduled by the UE may occur.
  • the UE performs power scale-down only for one specific U cell and the corresponding U cell. Phase CCA and UL signal transmission may be allowed.
  • a predetermined value for example, P_u in FIG. 17, P_u or T * P_u in FIG. 18
  • both P_u1 and P_u2 may be larger than P_u. That is, P_u1> P_u and P_u2> P_u.
  • the UE may perform UL signal transmission with a power of w * P_u1.
  • This method may also be applied to the method described with reference to FIG. 18. That is, the terminal may perform UL signal transmission with the power of T * w * P_u1.
  • the UE when all P_ux is greater than or equal to a certain value, the UE performs power scaling down on only one specific U cell, and the method of selecting one particular U cell by the UE is described in the above-described method (1) to 4.3.3. (3) is applicable.
  • the terminal selects any one U cell as in Method (1), or selects one U cell whose P_ux is maximum (or minimum) as in Method (2), or As such, it may be configured to select one U-cell having the highest priority according to a preset priority.
  • the power scaling threshold T may be set differently according to the UL transmission signal.
  • the T value applied at PUSCH transmission may be greater than the T value applied at SRS transmission.
  • the T value may be set to a different value for each UE and / or for each U cell.
  • FIG. 19 is a means by which the methods described in FIGS. 1 to 18 may be implemented.
  • a UE may operate as a transmitting end in uplink and a receiving end in downlink.
  • an e-Node B eNB
  • eNB e-Node B
  • the terminal and the base station may include transmitters 1940 and 1950 and receivers 1950 and 1970 to control the transmission and reception of information, data and / or messages, respectively.
  • the terminal and the base station may each include a processor (1920, 1930) for performing the above-described embodiments of the present invention and a memory (1980, 1990) that can temporarily or continuously store the processing of the processor, respectively. Can be.
  • Embodiments of the present invention can be performed using the components and functions of the above-described terminal and base station apparatus.
  • the processor of the terminal may perform UL power control based on the above-described methods when the scheduled serving cells are L cells and / or U cells.
  • the processor of the base station transmits a UL grant for scheduling L cells and / or U cells to the terminal, and the UL grant includes P CMAX necessary for power control, power scale threshold T, and / or weight w for power scale down. Can be.
  • P CMAX , T, w values, etc. may be transmitted to the UE through higher layer signaling rather than the UL grant.
  • the transmitter and the receiver included in the terminal and the base station include a packet modulation and demodulation function, a high speed packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, and a time division duplex (TDD) for data transmission. Packet scheduling and / or channel multiplexing may be performed.
  • the terminal and the base station of FIG. 19 may further include a low power radio frequency (RF) / intermediate frequency (IF) unit.
  • RF radio frequency
  • IF intermediate frequency
  • the terminal is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) phone, an MBS.
  • PDA personal digital assistant
  • PCS personal communication service
  • GSM Global System for Mobile
  • WCDMA Wideband CDMA
  • MBS Multi Mode-Multi Band
  • a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal mobile terminal, in a mobile communication terminal.
  • a multimode multiband terminal can be equipped with a multi-modem chip to operate in both portable Internet systems and other mobile communication systems (e.g., code division multiple access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • Embodiments of the invention may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to embodiments of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs). Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
  • software code may be stored in memory units 1980 and 1990 and driven by processors 1920 and 1930.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • Embodiments of the present invention can be applied to various wireless access systems.
  • various radio access systems include 3rd Generation Partnership Project (3GPP), 3GPP2 and / or IEEE 802.xx (Institute of Electrical and Electronic Engineers 802) systems.
  • Embodiments of the present invention can be applied not only to the various radio access systems, but also to all technical fields to which the various radio access systems are applied.

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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 concerne des procédés de contrôle de la puissance de liaison montante dans un système d'accès sans fil prenant en charge une bande sans licence, et des appareils correspondants. Dans un mode de réalisation de la présente invention, un procédé de contrôle de la puissance de liaison montante (UL) par un UE dans un système d'accès sans fil prenant en charge une bande sans licence peut comprendre les étapes consistant à : recevoir deux ou plusieurs autorisations UL contenant des informations de programmation ; lorsqu'une cellule de bande avec licence (L-Cell) et une cellule de bande sans licence (U-Cell) sont incluses dans les cellules de desserte programmées, exécuter un contrôle de puissance sur la base de la somme (P_L) de la puissance de transmission requise par la L-Cell, de la puissance de transmission maximale (P_u) pouvant être transmise par la cellule U, d'une valeur de puissance garantie (P_g) pour la cellule U, et de la puissance de transmission maximale (PCMAX) pouvant être utilisée par l'UE ; et transmettre un signal UL dans chacune de la L-Cell et de la U-Cell sur la base de la puissance de transmission dérivée du contrôle de puissance, et des informations de programmation.
PCT/KR2016/000814 2015-01-26 2016-01-26 Procédé de contrôle de la puissance de liaison montante dans un système d'accès sans fil prenant en charge une bande sans licence, et appareil correspondant WO2016122187A1 (fr)

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US201562108021P 2015-01-26 2015-01-26
US62/108,021 2015-01-26
US201562142456P 2015-04-02 2015-04-02
US62/142,456 2015-04-02

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