WO2011122911A2 - 무선 접속 시스템에서 채널상태정보 전송 방법 - Google Patents
무선 접속 시스템에서 채널상태정보 전송 방법 Download PDFInfo
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- WO2011122911A2 WO2011122911A2 PCT/KR2011/002289 KR2011002289W WO2011122911A2 WO 2011122911 A2 WO2011122911 A2 WO 2011122911A2 KR 2011002289 W KR2011002289 W KR 2011002289W WO 2011122911 A2 WO2011122911 A2 WO 2011122911A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
- H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
- H04J2211/005—Long term evolution [LTE]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
- H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
- H04J2211/006—Single carrier frequency division multiple access [SC FDMA]
Definitions
- the present invention relates to a wireless access system.
- the present invention relates to various methods for transmitting channel state information for one or more serving cells in a carrier combining environment, and an apparatus supporting the same. Also disclosed are PHICH allocation methods.
- a number of carriers constituting uplink and downlink may be one each, and a wireless communication system in which uplink bandwidth and downlink bandwidth are generally symmetrical to each other may be provided.
- ITU International Telecommunication Union
- carrier aggregation Bandwidth Aggregation
- Spectrum Aggregation for efficient use of fragmented small bands to achieve the same effect as combining multiple bands physically in the frequency domain and using bands of logically large bands.
- Carrier aggregation is introduced to support increased throughput, to prevent cost increases due to the introduction of wideband RF devices, and to ensure compatibility with existing systems.
- Carrier aggregation refers to data between a terminal and a base station through a plurality of bundles of carriers in a bandwidth unit defined in a conventional radio access system (LTE system in case of LTE-A system, or IEEE 802.16e system in case of IEEE 802.16m system). It is a technology that can be exchanged.
- LTE system in case of LTE-A system
- IEEE 802.16e system in case of IEEE 802.16m system
- the carrier of the bandwidth unit defined in the existing wireless communication system may be referred to as a component carrier (CC).
- the carrier aggregation technology may include a technology that supports a system bandwidth of up to 5 MHz by tying up to 5 component carriers even though one component carrier supports a bandwidth of 5 MHz, 10 MHz, or 20 MHz.
- data may be simultaneously transmitted and received through multiple uplink / downlink component carriers.
- the terminal can monitor and measure all component carriers.
- the terminal In the uplink transmission of the terminal, it is required to maintain a single-carrier characteristic for the uplink transmission signal in order to reduce distortion of the power amplifier.
- a plurality of PUCCHs are to be transmitted through the same subframe, it is necessary to define a UE behavior for maintaining a single carrier characteristic of an uplink transmission signal.
- the UE should transmit control information for one serving cell.
- CSI channel state information
- an object of the present invention is to define an uplink operation of a terminal for CSI transmission for a plurality of serving cells in a multicarrier combining environment.
- Another object of the present invention is to provide a method for transmitting one control information (ie, CSI) through one PUCCH when CSI transmission for a plurality of serving cells through a plurality of PUCCHs is simultaneously requested in a specific subframe. It is.
- CSI control information
- Another object of the present invention is to provide a CSI dropping method according to priority so that only a specific CSI can be transmitted among a plurality of CSIs.
- the terminal proposes a method of dropping a specific CSI according to a cell type, a CSI transmission period, and / or a CSI type.
- the present invention discloses various methods and apparatuses for supporting the channel state information for one or more serving cells in a carrier coupling environment.
- a method for reporting channel state information (CSI) in a wireless access system supporting carrier combining includes: receiving, by a terminal, information related to a CSI reporting mode for at least one serving cell from a base station; Reporting channel state information (CSI) for one or more serving cells to the base station in consideration of the CSI reporting mode.
- CSI channel state information
- the UE may select one according to the priority of the CSI report type related to the CSI reporting mode. Only the CSI for the serving cell may be reported to the base station.
- a method for receiving channel state information (CSI) in a wireless access system supporting carrier combining includes transmitting information associated with a CSI reporting mode for at least one serving cell from a base station to a terminal and from the terminal.
- the method may include receiving channel state information (CSI) of at least one serving cell considering the CSI reporting mode.
- CSI channel state information
- a terminal for reporting channel state information (CSI) in a wireless access system supporting carrier combining includes a transmission module for transmitting a channel signal, a receiving module for receiving a channel signal, and a CSI report. It may include a supporting processor.
- the terminal receives information related to the CSI reporting mode for at least one serving cell from the base station through the receiving module, and reports channel state information (CSI) for at least one serving cell to the base station in consideration of the CSI reporting mode. can do.
- the terminal may transmit one serving cell according to the priority of the CSI report type related to the CSI reporting mode. Only CSI for may be reported to the base station.
- the terminal may transmit only the first type CSI to the base station and drop the second type CSI.
- the first type CSI indicates that the terminal reports only the RI and the first PMI or RI
- the second type CSI indicates that the terminal only WB-CQI and the second PMI, WB-CQI and the first PMI, or the WB-CQI to the base station. You can report it.
- the first type CSI indicates that the terminal reports only the WB-CQI and the second PMI, the WB-CQI and the first PMI, or the WB-CQI to the base station
- the second type CSI indicates the SB-CQI and the second PMI or It may indicate reporting only the SB-CQI to the base station.
- the first type CSI may indicate that the UE reports only the RI and the first PMI or RI
- the second type CSI may indicate that only the SB-CQI and the second PMI or SB-CQI are reported to the base station.
- the first type CSI and the second type CSI may be set to support the CSI reporting mode.
- reporting the CSI may be performed periodically according to each content of the CSI.
- the first type CSI is CSI report type 3 or CSI report type 5
- the second type CSI is CSI report type 2b, CSI report type 2c, CSI report type 4, CSI report type 1 or CSI report Type 1a.
- the first type CSI may be CSI report type 2b, CSI report type 2c or CSI report type 4
- the second type CSI may be CSI report type 1 or CSI report type 1a.
- a first type CSI may be transmitted to the base station via a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).
- the first type CSI when the first type CSI is transmitted through the PUSCH, the first type CSI may be transmitted by being piggybacked or multiplexed on uplink data.
- the first type CSI when the UE is in the PUSCH and PUCCH signal simultaneous transmission mode, the first type CSI is transmitted through the PUCCH region, and when the UE is in the individual transmission mode of the PUSCH or PUCCH signal, the first type CSI is upward in the PUSCH region. It can be piggybacked with link data and transmitted.
- CSI channel state information
- one control information (ie, CSI) may be transmitted through one PUCCH.
- FIG. 1 is a view showing the structure of a radio frame that can be used in embodiments of the present invention.
- FIG. 2 is a diagram illustrating a resource grid for one downlink slot that can be used in embodiments of the present invention.
- FIG. 3 is a diagram illustrating a structure of a downlink subframe that can be used in embodiments of the present invention.
- FIG. 4 is a diagram illustrating an example of an uplink subframe structure that can be used in embodiments of the present invention.
- FIG. 6 is a diagram illustrating methods of selectively selecting a frequency band to generate a CQI.
- FIG. 7 is a diagram illustrating an example of multi-carrier combining (carrier aggregation) used in a component carrier (CC) of the LTE system and the LTE_A system.
- CC component carrier
- FIG. 8 is a diagram illustrating an example of a cross-component carrier scheduling method that can be used in the present invention.
- FIG. 9 is a view showing one of the CSI reporting method according to the priority of the channel state information (CSI) according to an embodiment of the present invention.
- FIG. 10 is a view showing one of the CSI dropping method according to the cell type according to an embodiment of the present invention.
- FIG. 11 is a diagram illustrating an example of a CSI dropping method according to a CSI reporting period according to an embodiment of the present invention.
- FIG. 12 illustrates an example of a CSI dropping method according to a CSI type according to an embodiment of the present invention.
- FIG. 13 is a diagram illustrating another example of a CSI dropping method according to a CSI type according to an embodiment of the present invention.
- FIG. 14 is a diagram illustrating an association relationship between 100 UL RBs and 100 DL PHICH resources that may be referred to in embodiments of the present invention.
- 15 to 19 illustrate exemplary embodiments of a PHICH resource allocation method according to embodiments of the present invention.
- FIG. 20 illustrates an example of an apparatus supporting the channel state information transmitting method disclosed in the present invention as an embodiment of the present invention.
- Embodiments of the present invention disclose various methods for transmitting channel state information for one or more serving cells in a carrier combining environment and apparatuses supporting the same. Also disclosed are PHICH allocation methods.
- 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 'mobile station' may be a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, an advanced mobile station (AMS) or a terminal. (Terminal), etc. may be substituted.
- UE user equipment
- SS subscriber station
- MSS mobile subscriber station
- AMS advanced mobile station
- Terminal Terminal
- 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 may be supported by 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213 and 3GPP TS 36.321 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.
- 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 evolution of the 3GPP LTE system.
- 3GPP LTE / LTE-A mainly described, but the technical idea of the present invention is not limited thereto.
- FIG. 1 is a view showing the structure of a radio frame that can be used in embodiments of the present invention.
- a radio frame consists of 10 subframes, and one subframe consists of two slots.
- the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- the length of one subframe is 1ms
- the length of one slot is 0.5ms.
- One slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain, and includes a plurality of Resource Blocks (RBs) in the frequency domain.
- the OFDM symbol is for representing one symbol period in a 3GPP LTE system using an Orthogonal Frequency Division Multiplexing Access (OFDMA) scheme in downlink. That is, the OFDM symbol may be referred to as an SC-FDMA symbol or a symbol interval according to a multiple access scheme.
- the RB includes a plurality of consecutive subcarriers in one slot in resource allocation units.
- the structure of the radio frame of FIG. 1 is merely an 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.
- FIG. 2 is a diagram illustrating a resource grid for one downlink slot that can be used in embodiments of the present invention.
- the downlink slot includes a plurality of OFDM symbols in the time domain.
- one downlink slot includes seven OFDM symbols, and one resource block (RB) includes 12 subcarriers in a frequency domain.
- Each element on the resource grid is called a resource element (RE), and one resource block RB includes 12 ⁇ 7 resource elements RE.
- the number N DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell.
- FIG. 3 is a diagram illustrating a structure of a downlink subframe that can be used in embodiments of the present invention.
- the subframe includes two slots in the time domain. Up to three OFDM symbols of the first slot in the subframe are a control region to which control channels are allocated, and the remaining OFDM symbols are a data region to which a Physical Downlink Shared Channel (PDSCH) is allocated.
- PDSCH Physical Downlink Shared Channel
- Downlink control channels used in the 3GPP LTE system include a PCFICH (Physical Control Format Indicator Channel), PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid-ARQ Indicator Channel).
- the PCFICH signal transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of the control channel signal in the subframe.
- the PHICH carries an ACK (Acknowledgement) / NACK (None-Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.
- the DCI includes resource allocation information and other control information for a user equipment (UE) or a terminal group. For example, it may include uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command.
- PDCCH includes transmission format and resource allocation information of downlink shared channel (DL-SCH), transmission format and resource allocation information of uplink shared channel (UL-SCH), paging channel (PCH) Paging information on a channel), system information on a DL-SCH, resource allocation information on a higher layer control message such as a random access response transmitted on a PDSCH, a transmit power control command set for individual UEs in a certain UE group, and transmission It can carry information on power control commands, activation of the Voice of Internet Protocol (VoIP), and the like.
- DL-SCH downlink shared channel
- UL-SCH uplink shared channel
- PCH paging channel
- PCH paging channel
- system information on a DL-SCH resource allocation information on a higher layer control message such as a random access response transmitted on a PDSCH
- a transmit power control command set for individual UEs in a certain UE group and transmission It can carry information on power control commands, activation of the Voice of Internet Protocol (VoIP), and the like
- Multiple PDCCHs may be transmitted in one control region.
- the UE can monitor multiple PDCCHs.
- the PDCCH may be transmitted on one or more consecutive control channel elements (CCEs).
- CCE is a logical allocation resource used to provide a PDCCH at one coding rate based on the 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 available bits of the PDCCH are determined according to the correlation between the coding rate provided in the CCE and the number of CCEs.
- the base station determines the PDCCH format according to the DCI to be transmitted to the UE, and attaches the CRC to the control information.
- the CRC is masked with a unique identifier (RNTI: Radio Network Temporary Identifier) according to the usage or owner of the PDCCH.
- RNTI Radio Network Temporary Identifier
- the unique identifier of the UE eg, C-RNTI: Cell-RNTI
- the paging indicator identifier eg, P-RNTI: Paging-RNTI
- the PDCCH is for system information (especially system information block)
- the system information identifier and system information RNTI S-RNTI
- a random access RNTI RA-RNTI
- the PDCCH may be transmitted through one or more component carriers and may include resource allocation information for one or more component carriers.
- the PDCCH is transmitted on one component carrier, but may include resource allocation information for one or more PDSCHs and PUSCHs.
- FIG. 4 is a diagram illustrating an example of an uplink subframe structure that can be used in embodiments of the present invention.
- the uplink subframe includes a plurality of slots (eg, two).
- the slot may include different numbers of SC-FDMA symbols according to the CP length.
- the uplink subframe is divided into a data region and a control region in the frequency domain.
- the data area includes a physical uplink shared channel (PUSCH) and is used to transmit a data signal including voice information.
- the control region includes a PUCCH (Physical Uplink Control Channel) and is used to transmit uplink control information (UCI).
- the PUCCH includes RB pairs located at both ends of the data region on the frequency axis and hops to a slot boundary. In the LTE system, the UE does not simultaneously transmit the PUCCH signal and the PUSCH signal in order to maintain a single carrier characteristic.
- PUCCH for one UE is allocated as an RB pair in a subframe, and RBs belonging to the RB pair occupy different subcarriers in each of two slots. This is said that the RB pair allocated to the PUCCH is frequency hopping at the slot boundary.
- PUCCH may be used to transmit the following control information.
- SR Service Request: Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.
- HARQ ACK / NACK This is a response signal for a downlink data packet on a PDSCH. Indicates whether the downlink data packet was successfully received. One bit of ACK / NACK is transmitted in response to a single downlink codeword, and two bits of ACK / NACK are transmitted in response to two downlink codewords.
- CQI Channel Quality Indicator
- MIMO Multiple Input Multiple Output
- RI rank indicator
- PMI precoding matrix indicator
- the amount of uplink control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for control information transmission.
- SC-FDMA available for transmission of control information means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of the subframe in which the Sounding Reference Signal (SRS) is set, the last of the subframe SC-FDMA symbols are also excluded.
- the reference signal is used for coherent detection of the PUCCH.
- PUCCH supports seven formats according to the transmitted information.
- Table 1 shows a mapping relationship between PUCCH format and UCI in LTE.
- network entities preferably feed back channel information to each other.
- downlink channel information is fed back uplink
- uplink channel information is fed backlink downlink.
- This channel information is called a channel quality indicator (CQI).
- CQI channel quality indicator
- the CQI can be generated in several ways.
- the CQI is generated by quantized information of a channel state as it is, or is generated by calculating signal to interference and noise ratio (SINR), or represents a state in which a channel is actually applied, such as a modulation coding scheme (MCS).
- SINR signal to interference and noise ratio
- MCS modulation coding scheme
- the MCS information includes information about a modulation scheme, a coding scheme, and a coding rate accordingly. Therefore, when the CQI is generated based on the MCS, the CQI should be changed accordingly when the modulation scheme and / or encoding scheme is changed. That is, at least one CQI is required per codeword unit.
- the number of required CQIs also changes.
- the MIMO system generates multiple channels using multiple antennas, so that multiple codewords can be used. Therefore, as the number of codewords increases, the number of CQIs also increases.
- the number of CQIs increases, the amount of control information that network entities must transmit increases proportionally.
- the UE may measure the downlink channel quality while monitoring the downlink channel, and report the selected CQI value to the base station through the uplink control channel.
- the base station performs downlink scheduling (e.g. terminal selection, resource allocation, etc.) according to the reported CQI value.
- the CQI value may be set to a SINR of a channel, a carrier to interference and noise ratio (CINR), a bit error rate (BER) and / or a frame error rate (FER), and the like.
- CINR carrier to interference and noise ratio
- BER bit error rate
- FER frame error rate
- rank information RI
- PMI precoding matrix information
- a link adaptation technique may be used to maximize the channel capacity of the radio channel in the radio access system.
- the link application technique is a technique for adjusting MCS and transmit power according to a given channel. In order to use the link application technique in the base station, it is necessary to receive CQI information from the terminal.
- the channel changes rapidly within one bandwidth.
- a multi-carrier system such as an Orthogonal Frequency Division Multiplexing (OFDM) system
- OFDM Orthogonal Frequency Division Multiplexing
- a channel signal may be transmitted for each subcarrier in order to optimally transmit the channel signal.
- the fed back channel information e.g. control signal
- embodiments of the present invention propose various CQI generation methods.
- a basic unit of a method of grouping one or more subcarriers into one group and reporting CQI in subcarrier group units is defined as a CQI subcarrier group or a CQI subband (SB CQI).
- the entire frequency band may be divided into some frequency bands, and a CQI may be generated based on the divided frequency bands.
- the divided frequency band for generating CQI may be defined as a CQI subband.
- channel information indicator can be generated by compressing channel information.
- channel information for each subcarrier is compressed and transmitted using a compression scheme.
- methods such as a discrete cosine transform (DCT) may be considered.
- a specific frequency band may be selected to generate channel information, and a CQI for the selected specific frequency band may be generated.
- a CQI for the selected specific frequency band may be generated.
- M the best random number of subcarriers
- FIG. 6 is a diagram illustrating methods of selectively selecting a frequency band to generate a CQI.
- the first method is to select a frequency band (ie, CQI subband) to generate CQI.
- FIG. 6 there are i) an optimal M method and ii) a threshold-based selection method as methods for selecting a CQI subband.
- the optimal M technique is for network entities to select M CQI subbands with good channel condition.
- FIG. 6 illustrates a case where three CQI subbands having a good channel state (that is, a high CQI value) are selected among the subbands. Referring to FIG. 6, three subbands having a high CQI value are subbands CQI indexes 5, 6, and 9, and corresponding subbands may be selected.
- the threshold-based method is a method of selecting a CQI subband having a channel state higher than a predetermined threshold. For example, since the CQI subbands higher than the predetermined threshold in FIG. 6 are CQI indexes 5 and 6, the user may select 5 and 6 CQI subbands.
- the second method of generating control information by manipulating the CQI values are iii) Individual transmission method and iv) Average transmission method.
- the individual transmission method is a method of individually transmitting all CQI values of the CQI subband selected in the method i). In the individual transmission method, as the number of selected CQI subbands increases, CQI values to be transmitted increase accordingly.
- the average transmission method is a method of transmitting an average value of CQI values of a selected CQI subband. Therefore, the average transmission method has an advantage of having one CQI value to be transmitted regardless of the number of selected CQI subbands.
- the averaging method may be a simple arithmetic average, or may be an average in consideration of channel capacity.
- bitmap indexing method one bit is allocated to every CQI subband, and if the corresponding CQI subband is selected, the corresponding bit is set to '1', or to '0'.
- the bitmap index method can easily indicate which CQI subband is used. However, the bitmap index method should always use a certain number of bits regardless of how many CQI subbands are used.
- the combination index method is a method of determining in advance how many CQI subbands are to be used, and mapping combinations of as many CQI subbands as used in the total CQI subbands to each index. For example, when there are a total of N CQI subbands and M out of N CQI subband indices are used, the total number of possible combinations is given by Equation 1 below.
- Equation 2 The number of bits for representing the number of cases derived from Equation 1 can be obtained through Equation 2 below.
- the number of CQIs transmitted by network entities may increase according to various dimensions.
- the CQI increase in the spatial dimension is as follows. In a MIMO system, when transmitting multiple codewords through multiple layers, multiple CQIs are required according to codewords.
- up to two codewords may be used in MIMO, and two CQIs are required at this time. If one CQI consists of four bits and two codewords, the CQI should consist of a total of eight bits. Since the CQI is transmitted by all users informing the channel state, the overhead due to the CQI is rapidly increased in view of all radio resources. Therefore, it is desirable to reduce the size of the information bits of the CQI in terms of the total channel capacity of the network.
- the CQI increase in the frequency dimension is as follows. If the receiving side selects the frequency band having the best channel state and transmits only the selected frequency, and the transmitting side also provides service through the selected frequency band, the CQI is needed in only one band. However, this approach is appropriate in a single user environment, but in a multi-user environment it is not suitable because the channel state cannot be assigned the best frequency to all users.
- the amount of CQI transmission information increases by the selected frequency band. For example, if users select three frequency bands in order of good channel condition and transmit each CQI and frequency band indicator, the transmission amount of CQI is tripled. In addition, the transmission of an additional indicator to indicate the frequency band selected by the user.
- CQI may be considered in consideration of both space and frequency. Multiple CQIs are needed in the spatial dimension, and multiple CQIs may be needed in the frequency dimension.
- CQI Code Division Multiple Access
- CDMA Code Division Multiple Access
- changes in signal strength and interference amount occur for each spreading code. Therefore, CQI can be transmitted and received according to each spreading code. Therefore, the number of CQIs can be increased in the spread code dimension.
- differential CQI Differential CQI can be understood as a concept similar to differential modulation in the modulation / demodulation method.
- a large number of bits can be allocated to the CQI reference value and a relatively small number of bits can be allocated to the difference value, thereby reducing the total amount of transmitted CQIs.
- the uplink channel used for CQI transmission in the 3GPP LTE system is shown in Table 2 below.
- the CQI may be transmitted using a physical uplink control channel (PUCCH) at a period determined by a higher layer, and may be aperiodically used according to a scheduler's needs. It may be transmitted using a Physical Uplink Shared Channel.
- the CQI is transmitted through the PUSCH only in the case of frequency selective scheduling and aperiodic CQI transmission.
- a CQI transmission scheme according to a scheduling scheme and periodicity will be described.
- a control signal for requesting to transmit a CQI may be included in a PUSCH scheduling control signal (UL Grant) transmitted as a PDCCH signal.
- UL Grant PUSCH scheduling control signal
- Table 3 below shows a mode of a terminal when transmitting a CQI, a precoding matrix index (PMI), and a rank indicator (RI) through a PUSCH.
- the transmission mode of Table 3 is selected in the upper layer, and CQI / PMI / RI are all transmitted in the same PUSCH subframe.
- CQI / PMI / RI are all transmitted in the same PUSCH subframe.
- Mode 1-2 represents a case in which a precoding matrix is selected on the assumption that data is transmitted only through subbands for each subband.
- the UE generates a CQI assuming a precoding matrix selected for the entire band (set S) designated by the system band or the upper layer.
- the UE may transmit the CQI and the PMI value of each subband.
- the size of each subband may vary depending on the size of the system band.
- the UE in mode 2-0 may select the M subbands that are preferred for the designated band set S designated by the system band or the upper layer.
- the UE may generate one CQI value on the assumption that data is transmitted for the selected M subbands. It is preferable that the UE reports one wideband CQI (CQI) value for the system band or set S.
- CQI wideband CQI
- the terminal defines a CQI value for each codeword in a differential format.
- the differential CQI value is determined as a difference value between an index corresponding to the CQI values for the selected M subbands and a wideband CQI (WB-CQI) index.
- the UE in mode 2-0 transmits information on the location of the selected M subbands, one CQI value for the selected M subbands, and a CQI value generated for all bands or a set band (set S) to the base station.
- the size of the subband and the M value may vary depending on the size of the system band.
- the UE in mode 2-2 transmits data through M preferred subbands, it simultaneously selects the positions of M preferred subbands and a single precoding matrix for M preferred subbands. Can be.
- CQI values for M preferred subbands are defined for each codeword.
- the terminal further generates a wideband CQI (wideband CQI) value for the system band or the designated band (set S).
- the UE in mode 2-2 may provide information on the location of the M preferred subbands, one CQI value for the selected M subbands, a single PMI for the M preferred subbands, a wideband PMI, and a wideband CQI value. It can transmit to the base station.
- the size of the subband and the M value may vary depending on the size of the system band.
- the UE in mode 3-0 generates a wideband CQI value.
- the UE generates a CQI value for each subband assuming that data is transmitted through each subband. At this time, even if RI> 1, the CQI value represents only the CQI value for the first codeword.
- a terminal in mode 3-1 generates a single precoding matrix for a system band or a set band (set S).
- the UE assumes a single precoding matrix previously generated for each subband and generates subband CQI for each codeword.
- the terminal may assume a single precoding matrix and generate a wideband CQI.
- the CQI value of each subband may be expressed in a difference form.
- the subband CQI value is calculated as a difference between the subband CQI index and the wideband CQI index.
- the size of the subband may vary depending on the size of the system band.
- the terminal may periodically transmit a control signal (e.g. CQI / PMI / RI information) to the base station via the PUCCH. If the terminal receives a control signal for transmitting user data, the terminal may transmit the CQI through the PUSCH. Even if the control signal is transmitted through the PUSCH, the CQI / PMI / RI may be transmitted by one of the modes defined in Table 4 below.
- a control signal e.g. CQI / PMI / RI information
- the terminal may have a transmission mode as shown in Table 4.
- the bandwidth part (BP) is a set of subbands consecutively located in the frequency domain. It can cover both the system band or the set band (set S).
- the size of each subband, the size of the BP, and the number of BPs may vary depending on the size of the system band.
- the terminal transmits the CQI in ascending order in the frequency domain for each BP to cover the system band or the set band (set S).
- the UE may have four transmission types as follows.
- Type 1 Subband CQI (SB-CQI) of Mode 2-0 (Mode 2-0) and Mode 2-1 is transmitted.
- Second Type (Type 2): transmits wideband CQI and PMI (WB-CQI / PMI).
- the CQI / PMI is transmitted in subframes having different periods and offsets.
- CQI / PMI is not transmitted.
- the transmission period of the wideband CQI / PMI and the subband CQI is P, and has the following characteristics.
- Wideband CQI / PMI has a period of H * P.
- H J * K + 1
- J is the number of BPs
- K is the number of total cycles of the BPs. That is, the terminal is ⁇ 0, H, 2H,... ⁇ Is sent.
- the CQI is transmitted at the J * K point other than the wideband CQI / PMI point.
- the transmission period of RI is M times the wideband CQI / PMI period, and has the following characteristics.
- the offset of the RI and the wideband CQI / PMI is O, and when the RI and the wideband CQI / PMI are transmitted in the same subframe, the wideband CQI / PMI is not transmitted.
- the terminal When the terminal is in mode 1-0 (mode 1-0) and transmits the RI to the base station, the terminal generates the RI for the system band or the designated band (set S), and the base station generates a third type report for transmitting the RI To transmit.
- the terminal transmits the CQI, it transmits a wideband CQI.
- the UE When the terminal is in mode 1-1 (Mode 1-1) and transmits an RI, the UE generates an RI for a system band or a designated band (set S) and transmits a third type report for transmitting the RI to the base station.
- the UE transmits CQI / PMI, a single precoding matrix is selected in consideration of the most recently transmitted RI. That is, the terminal transmits a second type report consisting of a wideband CQI, a single precoding matrix, and a differential wideband CQI to the base station.
- the UE When the terminal is in mode 2-0 (Mode 2-0) and transmits an RI, the UE generates an RI for a system band or a designated band (set S) and transmits a third type report for transmitting the RI to the base station.
- the terminal transmits the wideband CQI the wideband CQI is generated assuming the most recently transmitted RI, and the fourth type report is transmitted to the base station.
- the terminal transmits the CQI for the selected subband the terminal selects the most preferred subband for J BPs composed of N subbands and transmits a first type report to the base station.
- the first type report may be transmitted on one or more subframes according to the BP.
- the UE When the terminal is in mode 2-1 (Mode 2-1) and transmits an RI, the UE generates an RI for a system band or a designated band (set S) and transmits a third type report for transmitting the RI to the base station.
- the terminal transmits the wideband CQI to the base station the wideband CQI is generated in consideration of the most recently transmitted RI and a fourth type report is transmitted to the base station.
- the UE When the CQIs for the selected subbands are transmitted, the UE has a single CQI value for the subbands selected in the BP in consideration of the most recently transmitted PMI / RI for the N j BPs, and RI is 1 If larger, assuming that a single precoding matrix is used for the most recently transmitted RI and the selected subband, a CQI difference of codewords is generated and a first type report is transmitted to the base station.
- the communication environment considered in the embodiments of the present invention includes a multi-carrier support environment. That is, the multicarrier system or carrier aggregation system used in the present invention refers to one or more carriers having a bandwidth smaller than the target band when configuring a target broadband to support the broadband. Refers to a system using aggregation of carriers.
- the multi-carrier refers to the aggregation (or carrier coupling) of the carrier, wherein carrier aggregation means not only coupling between adjacent carriers, but also coupling between non-adjacent carriers.
- carrier combining may be used interchangeably with terms such as carrier aggregation, bandwidth combining, and the like.
- a multicarrier ie, carrier aggregation
- two or more component carriers CC
- 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 3GPP LTE system (LTE R-8 system) supports ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz bandwidth
- the 3GPP LTE_advanced system (ie LTE_A) supports the above bandwidths supported by LTE. It can be used to support bandwidth greater than 20MHz.
- the multicarrier system used in the present invention may support carrier aggregation (ie, carrier aggregation, etc.) by defining a new bandwidth regardless of the bandwidth used in the existing system.
- FIG. 7 is a diagram illustrating an example of multi-carrier combining (carrier aggregation) used in a component carrier (CC) of the LTE system and the LTE_A system.
- CC component carrier
- the component carrier includes a downlink component carrier (DL CC) and an uplink component carrier (UL CC).
- DL CC downlink component carrier
- UL CC uplink component carrier
- One component carrier may have a frequency range of 20 MHz.
- FIG. 7 (b) shows a multi-carrier structure used in the LTE_A system.
- three component carriers having a frequency size of 20 MHz are combined.
- the UE may simultaneously monitor three component carriers, receive downlink signals / data, and transmit uplink signals / data.
- the network may allocate M (M ⁇ N) DL CCs to the terminal.
- the UE may monitor only M limited DL CCs and receive a DL signal.
- the network may give priority to L (L ⁇ M ⁇ N) DL CCs and allocate them to the UE as a main DL CC. In this case, the UE must monitor the L DL CCs. This method can also be applied to uplink transmission.
- the LTE-A system uses the concept of a cell to manage radio resources.
- the cell is defined by a combination of downlink resources and uplink resources, and uplink resources may be selectively defined.
- the cell may be configured with only downlink resources or with downlink resources and uplink resources.
- multicarrier ie carrier aggregation
- the linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource is indicated by the system information.
- the cell used in the LTE-A system is a concept including a primary cell (PCell) and a secondary cell (SCell).
- the P cell may mean a cell operating on a primary frequency (or primary CC)
- the S cell may mean a cell operating on a secondary frequency (or secondary CC).
- only one P cell is allocated to a specific terminal, and one or more S cells may be allocated.
- the PCell is used for the UE to perform an initial connection establishment process or to perform a connection re-establishment process.
- the Pcell may refer to a cell indicated in the handover process.
- the SCell can be configured after the RRC connection is established and can be used to provide additional radio resources.
- P cell and S cell may be used as a serving cell.
- the carrier aggregation is not configured or does not support the carrier aggregation
- one or more serving cells may exist, and the entire serving cell includes a PCell and one or more SCells.
- 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. That is, carrier matching may be understood as a combination of a Pcell and one or more Scells.
- the primary component carrier (PCC) may be used in the same sense as the PCell, and the secondary component carrier (SCC) may be used in the same sense as the SCell.
- FIG. 8 is a diagram illustrating an example of a cross-component carrier scheduling method that can be used in the present invention.
- the PDCCH structure and DCI format defined in the LTE Rel-8 standard do not support cross carrier scheduling. That is, the DCI format of the LTE Rel-8 and the PDCCH transmission structure (same coding method and resource mapping based on the same CCE) are used as they are. For example, a PDCCH on a component carrier allocates PDSCH resources to the same component carrier and allocates PUSCH resources on the associated UL component carrier. In this case, a Carrier Indicator Field (CIF) is not needed.
- CIF Carrier Indicator Field
- related PDSCH transmission, UL A / N, PUSCH transmission and PHICH transmission method also follows the contents of the LTE Rel-8 standard.
- the PDCCH structure and the DCI format defined in the LTE-A standard may support cross carrier scheduling. That is, a PDCCH (DL Grant) and a PDSCH may be 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 associated with a DL CC having received an UL grant. It may include the case that is transmitted through other UL CC.
- a carrier indicator field (CIF) indicating which DL / UL CC the PDSCH / PUSCH indicated by the corresponding PDCCH is transmitted to the PDCCH is required.
- the PDCCH may allocate PDSCH resource or PUSCH resource to one of a plurality of component carriers using a carrier indicator field.
- the DCI format of the LTE-A system can be extended according to 1 to 3 bits of CFI, and can reuse the PDCCH structure of the LTE Rel-8.
- Whether to allow cross-carrier scheduling may be determined UE-specifically, UE group-specifically, or cell-specifically, and semi-static operation of cross carrier scheduling may be performed. Signaling overhead can be reduced by toggling.
- the size of the CIF according to the permission of the cross carrier scheduling may be set semi-statically. This is similar to the terminal specific transmission mode is determined semi-statically in LTE Rel-8.
- the size of the CIF may be fixed as 3 bits, and the position of the CIF may be fixed regardless of the size of the DCI format.
- 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, no indication such as separate signaling for the PDCCH monitoring set is necessary.
- the PDCCH monitoring set When cross-carrier scheduling is activated, the PDCCH monitoring set is preferably defined in the UE DL CC set. In this case, an indication such as separate signaling for the PDCCH monitoring set is required.
- the base station may allocate a DL CC set for monitoring the PDCCH to reduce the number of blind decoding of the terminal.
- the DL CC set may be part of the combined DL CCs, and the UE may detect and decode the PDCCH only within the allocated DL CC set. That is, in order to schedule PDSCH and PUSCH to the UE, the base station may transmit PDCCHs only through the DL CC monitoring set.
- the PDCCH DL CC monitoring set may be set to UE specific, UE group specific or cell specific.
- DL CC A may be configured as a PDCCH monitoring DL CC. If CIF is not activated, the PDCCH and PDSCH are transmitted on the same DL CC scheduled according to the LTE Rel-8 rule. If CIF is activated, the PDCCH may be transmitted through the monitoring DL CC A, and the PDSCH may be transmitted through the DL CC B and the DL CC C as well as the DL CC A. However, the PDCCH may not be transmitted through the DL CCs B and C rather than the DL CC monitoring set.
- CSI channel state information
- the UE may be semi-statically configured by the upper layer to periodically feed back channel state information (CSI) to the base station on the PUCCH when two or more serving cells are allocated.
- the CSI may include a CQI, a PMI, an RI, and / or a precoding type indicator (PTI).
- the CSI type transmitted from the UE is classified into RI, WB-CQI (wideband CQI) / PMI, and SB-CQI (subband CQI) as shown in Table 5 below.
- Table 5 shows the CSI type transmitted by the terminal in each case in the LTE-A system. If the CQI transmission period according to each type is listed in large order, RI> WB-CQI / PMI> SB-CQI.
- L-PMI Long
- CoMP Cooperative Multi-Point
- S-PMI Short-term PMI
- the CSI type for LTE-A considering L-PMI and S-PMI may be applied based on a specific case among the possible cases shown in Table 5.
- the N-type CSI has a larger CSI transmission period compared to the N + 1-type CSI.
- the present invention assumes that the N-type CSI has a higher priority than the N + 1-type CSI. That is, the CSI transmission period may have priority in the longest order.
- the CSI type and number for CSI transmission of each DL CC are independently set for each DL CC based on a specific case.
- Case # 1 of Table 5 is applied for convenience of description.
- CSI transmission for a plurality of DL CCs is required from the terminal to the base station. That is, the terminal should transmit the CSI for one or more serving cells to the base station.
- a control channel eg PUCCH
- configuration information eg CSI transmission period, CSI transmission mode and / or CSI type, etc.
- the same may be set for a cell (eg DL CC) or for each serving cell group or independently for each serving cell.
- the PUCCH index for CSI transmission for a plurality of serving cells may also be allocated to all serving cells or the same for each serving cell group or differently for each serving cell.
- a method of transmitting one control information (ie, CSI) through one PUCCH is started.
- CSI dropping method according to CSI priority is disclosed so that only a specific CSI can be transmitted among a plurality of CSIs.
- a method of dropping a CQI for each serving cell according to a serving cell type, a CSI transmission period, and / or a CSI type will be described.
- a predetermined serving cell basically includes one or more downlink component carriers (DL CCs), and in some cases, may include an uplink component carriers (UL CCs).
- DL CCs downlink component carriers
- UL CCs uplink component carriers
- one serving cell may be used as one DL CC and / or UL CC.
- FIG. 9 is a view showing one of the CSI reporting method according to the priority of the channel state information (CSI) according to an embodiment of the present invention.
- the content of the CSI may be configured with one or a plurality of CSI reporting types.
- the CSI report type may be generated in association with the PUCCH format.
- the base station controls the time and frequency resources that can be used to report the CSI.
- the CSI may be composed of one or more of CQI, PMI (first PMI, second PMI), PTI, and RI.
- the UE may periodically transmit CSI for all activated serving cells.
- the UE may obtain information on the CSI report mode for one or more serving cells through a higher layer signal.
- the UE may acquire one or more transmission periods and offset values of CQI, PMI, PTI, and RI through higher layer signals (S910).
- the terminal may communicate with the base station through one or more serving cells, and the terminal may search and measure the states of the downlink channels (S920).
- the terminal may report channel state information (CSI) of one or more activated serving cells to the base station in a transmission period according to each content. That is, the terminal transmits the CSI of the first serving cell and the CSI of the second serving cell to the base station according to each CSI transmission period (S930 and S940).
- CSI channel state information
- step S930 and S940 if the terminal is configured in the PUSCH and PUCCH signal simultaneous transmission mode, the terminal may periodically report each CSI to the base station through the PUCCH region.
- the terminal when the terminal is not configured in the simultaneous transmission mode of the PUSCH and the PUSCH signal, the terminal piggybacks the CSI to the PUSCH signal and may periodically report the CSI through the PUSCH region.
- the transmission period of each CSI information may overlap in the same subframe. That is, the CSI to be transmitted in a specific subframe by the UE may collide (S950).
- the UE may compare the priority of the CSI report type related to the PUCCH format (S960), select a CSI having a higher priority, report it to the base station, and drop CSI for the remaining cells (S970).
- the priority of the CSI report type may be determined in consideration of a cell type, a CSI report period, a CSI report type, a transmission mode of a UE, a CSI report mode, and / or a PUCCH format.
- the transmission period and offsets may be determined according to the PUCCH CSI report mode as the CSI report type.
- the CSI report type indicates CSI according to the CSI report mode and is used to support the CSI report mode.
- the priority of CSI report type is CSI type 1 highest and CSI type 4 lowest.
- CSI type 1 indicates a case in which the UE reports the RL and the first PMI (L-PMI) to the base station (ie, CSI report type 5).
- the UE indicates when reporting the WB-CQI and the second PMI (S-PMI) to the base station (ie, CSI report type 2b), and the CSI type 3 indicates when the UE reports the SB-CQI to the base station (ie, CSI).
- CSI report type 1 indicates a case in which the UE reports the RL and the first PMI (L-PMI) to the base station (ie, CSI report type 5).
- the UE indicates when reporting the WB-CQI and the second PMI (S-PMI) to the base station (ie, CSI report type 2b), and the CSI type 3 indicates when the UE reports the SB-CQI to the base station (ie, CSI).
- S-PMI second PMI
- SB-CQI SB-CQI
- CSI type 1 indicates a case in which the UE reports RI and a first PMI (L-PMI) to the base station (ie, CSI report type 5)
- CSI type 2 indicates that the UE WB- It indicates the case of reporting the CQI to the base station (ie, CSI report type 4)
- the CSI type 3 indicates the case in which the UE reports the SB-CQI and the second PMI (S-PMI) to the base station (ie, CSI report type 1a).
- CSI type 1 indicates when the UE reports RI to the base station (ie, CSI report type 3), and CSI type 2 indicates that the UE is WB-CQI and the first PMI (L-PMI).
- CSI report type 2c indicates that the UE reports SB-CQI and the second PMI to the base station (ie, CSI report type 1a).
- Table 5 for the CSI report according to the remaining cases.
- the UE when the UE needs to simultaneously transmit CSI Type 1 for the first serving cell and CSI Type 2 for the second serving cell in a predetermined subframe (i), the UE has a higher priority of CSI Type 1 than CSI Type 2. Therefore, CSI type 2 having a low priority may be dropped and only CSI type 1 may be reported to the base station (S950 to S970).
- the UE may drop CSI type 3 having a lower priority and report only CSI type 2 to the base station.
- the UE may report the CSI for the CSI type 1 to the base station, and the CSI type 3 CSIs may be dropped (S950 to S970).
- the priority according to the CSI reporting type is summarized.
- the priority of the CSI reporting type 3 or 5 is higher than the CSI reporting type 2b, 2c or 4, and the priority of the CSI reporting type 2b, 2c or 4 is the CSI reporting type. It can be seen that it is higher than 1 or 1a.
- the CSI report type 2b, 2c or 4 having a lower priority Drop CSI for and send only CSI for CSI report type 3 or 5 to the base station.
- the UE drops CSI for CSI report type 1 or 1a having low priority and reports CSI.
- CSIs of type 2b, 2c or 4 transmit to the base station.
- FIG. 10 is a view showing one of the CSI dropping method according to the cell type according to an embodiment of the present invention.
- the UE transmits only CQIs for primary cells according to the cell type (ie, CC type). And CQI for the remaining S cells (Secondary Cell) can be dropped.
- a serving cell having a good channel state among a plurality of serving cells is likely to be configured as an anchor cell (ie, anchor DL CC) or a PDCCH monitoring cell.
- the anchor cell or the PDCCH monitoring cell may be configured as a P cell.
- downlink data transmission may also be preferentially performed through the Pcell.
- CSI reporting on a Pcell may be guaranteed first.
- DL CC # 1 represents a primary cell
- DL CC # 2 represents a secondary cell.
- the transmission periods of CQI information such as RI, L-PMI, WB-CQI / S-PMI, and SB-CQI in a PCell are assumed to be 40, 20, 10, and 5ms, respectively.
- RI, L-PMI The transmission periods of the WB-CQI / S-PMI and SB-CQI are assumed to be 48, 24, 12, and 6 ms, respectively.
- transmission periods of CQI information in each cell may overlap.
- the UE can maintain only a single carrier characteristic of the UE by transmitting only CQI information for the PCell to the base station and dropping CQI information for the SCell.
- FIG. 11 is a diagram illustrating an example of a CSI dropping method according to a CSI reporting period according to an embodiment of the present invention.
- the UE may drop CSI according to a transmission period of each CSI. That is, the UE may preferentially report the CSI information having the lowest frequency among the CSI information reported to the base station to the base station, and drop CSI information for another cell transmitted in the same subframe.
- CSI channel state information
- the transmission time interval of the CSI information becomes too large, the channel adaptation result may be unreliable according to the UE mobility change. Therefore, in consideration of the transmission period of the CSI information, it is possible to preferentially guarantee the transmission of the CSI having a large CSI transmission period.
- the UE when transmission of CSIs for a plurality of serving cells is simultaneously required in the same subframe, the UE transmits only CSIs for cells having the longest transmission period of the CSI reporting mode, and CSIs having relatively short transmission periods You can drop it.
- the relative size of the transmission period according to the CQI type can refer to Table 5.
- the UE may transmit only CSI for the serving cell having the largest transmission period according to the CSI reporting mode to be transmitted in the same subframe.
- the UE may transmit CSI information only for CSI information having the longest transmission period according to the CSI type and drop the remaining CSI information.
- the transmission period is long in order of RI> L-PMI> WB-CQI / S-PMI> SB-CQI.
- the transmission period of the CQI information of the Scell is long (for example, SB ⁇ LP, LP ⁇ SP, SP ⁇ SB). You can drop the CSI information.
- the first serving cell is a P cell and the second serving cell is an S cell.
- the first serving cell may be an S cell
- the second serving cell may be a P cell.
- FIG. 12 illustrates an example of a CSI dropping method according to a CSI type according to an embodiment of the present invention.
- the terminal may drop the CSI according to the CSI type.
- the configuration of the CSI information may be set independently according to the serving cell (e.g. DL CC). Therefore, the number M of CSI types set in each cell may be the same or different. For example, assuming that Case # 1 of Table 5 is applied, all four CQIs of RI, L-PMI, WB-CQI / S-PMI, and SB-CQI are used for the Pcell (DL CC # 1).
- the type may be set, and three CSI types of RI, L-PMI, and WB-CQI / S-PMI may be set for the SCell (DL CC # 2).
- a description will be given of a CSI transmission method of a terminal when the number M of CSI types is the same.
- the low priority (i.e., short period) CSI type may be determined depending on the high priority (i.e., long period) CSI type. That is, the priority of the CSI transmission may be changed according to the CSI type.
- L is determined first, and then L only within a long-term precoding codebook corresponding to the Rank.
- PMI can be determined.
- the S-PMI is determined only within a short-term precoding codebook defined by the determined L-PMI (eg, precoder transform, subset restriction, etc.).
- the WB-CQI and SB-CQI can be determined depending on this S-PMI. Therefore, the determination of the low priority CSI type is meaningful only if the high priority CSI type is previously determined.
- FIG. 12 illustrates a method of preferentially guaranteeing CSI transmission for a DL CC having the highest priority of the CSI type in view of the above description.
- M 4
- the transmission period for each CSI type is the same as the description of FIG. 10.
- the UE may perform CSI on the highest priority cell of the CSI type to be transmitted in the same subframe. Only information is transmitted. That is, when one or more serving cells are allocated to the UE and the CSI information for two or more serving cells needs to be transmitted in the same subframe, the UE transmits only the CSI information for the CSI-type high priority serving cell and transmits to the remaining cells. CSI information may be dropped.
- the priority of the first type CSI is higher than that of the other types, only the first type of CSI information may be transmitted and the remaining CSI information may be dropped.
- the CSI type (# 2) of the LP is smaller than the CSI type (# 4) of the SB in Case # 1.
- the terminal may transmit only the LP and drop the SB.
- the CSI type of the SP is smaller than the CSI type of the SB, the UE may transmit only the SP and drop the SB.
- FIG. 13 is a diagram illustrating another example of a CSI dropping method according to a CSI type according to an embodiment of the present invention.
- the terminal may drop the CSI according to the CSI type.
- the configuration of the CSI information may be set independently according to the serving cell (e.g. DL CC). Therefore, the number M of CSI types set in each cell may be the same or different.
- a description will be given of a CSI transmission method of a terminal when the number M of CSI types is different.
- the number M of CSI types for the Pcell (DL CC # 1) is 4, and the transmission period for each CSI type is the same as that of FIG. 10.
- the number M of CSI types is 3, and each CSI information is RI, L-PMI, and WB-CQI / S-PMI.
- the transmission periods of RI, L-PMI, and WB-CQI / S-PMI in the SCell are 48, 24, and 12 ms, respectively.
- the terminal may transmit only CSI information for a cell having the smallest number of CSI types.
- the UE since the number of CSI types of the Pcell is 4 and the number of CSI types of the Scell is 3, the UE transmits only the CQI information of the Scell when the CQI information of the Scell and the CQI information of the Pcell are transmitted in the same subframe. Can be.
- FIG. 13 illustrates a case in which the UE transmits only the CSI for the serving cell having the smallest number of CQI types to the base station for each case. However, even when the M values are different from each other, the UE may transmit only specific CSI information according to the priority of the CSI type as described in FIG. 12 and drop the remaining CSI information.
- the UE operates as shown in FIG. 12; otherwise, as shown in FIG. 13, only the CSI for the serving cell having the smallest M value is shown.
- the terminal may transmit only CSI information for the serving cell having the largest M value as opposed to the method of FIG. 13.
- the UE may transmit only CSI information of the Pcell in FIG. 13.
- the UE operates as shown in FIG. 12, otherwise, the UE can transmit only the CSI for the serving cell having the largest M value. have.
- the CSI dropping method may be selectively applied according to whether or not frequency-selective scheduling of the serving cell is performed and dependence is provided.
- transmission for a CSI type having a high priority such as RI or L-PMI may be guaranteed regardless of the M value.
- ACK / NACK feedback for UL data transmission on a PUSCH is transmitted through a downlink PHICH resource.
- the multiple PHICH resources are distinguished by a combination of time, frequency, orthogonal code including different cyclic prefix and / or I / Q phase domain.
- the PHICH resource used for ACK / NACK feedback corresponding to the PUSCH signal is determined based on UL Uplink Resource Block (RB) of the first slot in which the PUSCH signal is transmitted. That is, all indexes of the UL RB are associated with all PHICH resources.
- RB Uplink Resource Block
- the PHICH resource associated with the index of the UL RB having the smallest frequency among the UL RBs used for PUSCH transmission is used. That is, the PHICH resource associated with the lowest RB index used for PUSCH transmission is selected for ACK / NACK feedback.
- the PHICH resource used for PUSCH transmission may be adjusted by an offset value and an additional configuration signaled at higher layers.
- uplink frequency resources are allocated to one terminal in the uplink (that is, UL contiguous RA), but a plurality of terminals may be allocated (eg allocation of two discontinuous frequency resources (eg RB or RB group) (ie UL non-contiguous RA) is considered.
- the UE (UE) used in the present invention can support uplink multi-antenna transmission (ie UL MIMO) for high-speed, high-capacity data transmission over the uplink, and UL non-continuous (non- contiguous) RA may be applied.
- uplink multi-antenna transmission ie UL MIMO
- UL non-continuous (non- contiguous) RA may be applied.
- Embodiments of the present invention discloses two PHICH resource allocation methods considering the application of UL discontinuous RA in the UL MIMO transmission.
- 15 to 19 illustrate exemplary embodiments of a PHICH resource allocation method according to embodiments of the present invention.
- two CWICHs are transmitted by two PHICH resources linked to the allocated RB index n RB and the adjacent RB index n RB + 1 . It can be allocated as an ACK / NACK transmission resource for.
- 16 to 18 illustrate a case in which a UE is allocated two or more RBs for PUSCH transmission.
- two PHICH resources linked to the lowest index and the second lowest index among the RB indexes allocated by the UE may be allocated as ACK / NACK transmission resources for 2 CW transmissions.
- PHICH index 16 illustrates a case where a UL continuous resource allocation method is applied. Therefore, a PHICH index that is contiguous with a PHICH index mapped to the smallest RB index among UL RBs may be allocated as a PHICH resource.
- FIG. 17 and 18 illustrate a case where a non-contiguous resource allocation method is applied
- FIG. 17 illustrates that a PHICH index indicated by a lowest RB index and a contiguous PHICH index among non-contiguous UL RB resources may be allocated as PHICH resources.
- the PHICH index indicated by the lowest RB index in each of the non-contiguous RB groups may be allocated as the PHICH resource.
- the UE 2 CWs the two PHICH resources linked to the lowest index n RB and the adjacent RB index n RB + 1 among the allocated RB indexes. It may be allocated as an ACK / NACK transmission resource for transmission (see FIGS. 15 and 16).
- the UE when UL non-contiguous RA is applied for PUSCH transmission of the UE (ie, two discontinuous RB group assignments), the UE performs 2 CWs of two PHICH resources linked to the lowest index among the RB indexes in each allocated RB group. It may be allocated as an ACK / NACK transmission resource for transmission (FIGS. 17 and 18).
- FIG. 20 illustrates an example of an apparatus supporting the channel state information transmitting method disclosed in the present invention as an embodiment of the present invention.
- a user equipment may operate as a transmitter in uplink and a receiver in downlink.
- an e-Node B eNB
- eNB e-Node B
- the terminal and the base station may include a transmitting module (Tx module: 2040, 2050) and a receiving module (Rx module: 2050, 2070), respectively, to control the transmission and reception of information, data, and / or messages.
- Antennas 2000 and 2010 for transmitting and receiving data and / or messages.
- the terminal and the base station may each include a processor 2020 and 2030 for performing the above-described embodiments of the present invention and a memory 2080 and 2090 for temporarily or continuously storing the processing of the processor. Can be.
- the processors 2020 and 2030 may measure and report a state of a downlink channel for each serving cell activated in the carrier matching environment disclosed in the embodiments of the present invention.
- the processor may report the CSI to the base station according to the CSI priority according to the CSI report type (or the priority according to the PUCCH format). For example, when CSIs for one or more serving cells are to be transmitted in the same subframe according to each CSI transmission period, the processor of the UE may compare only the priorities for each CSI and transmit only the high priority CSI to the base station. have.
- the transmission module and the reception module included in the mobile station 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.
- Division Duplex may perform packet scheduling and / or channel multiplexing.
- the terminal and the base station of FIG. 20 may further include a low power radio frequency (RF) / intermediate frequency (IF) module.
- RF radio frequency
- IF intermediate frequency
- the apparatus described in FIG. 20 is a means in which various CSI reporting methods disclosed in the embodiments of the present invention can be implemented. Embodiments of the present invention can be performed using the components and functions of the above-described terminal and base station apparatus.
- 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, procedure, or function that performs the functions or operations described above.
- software code may be stored in the memory units 2080 and 2090 and driven by the processors 2020 and 2030.
- 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 invention may be embodied in a variety of other forms without departing from the essential features of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. In addition, the claims may be incorporated into claims that do not have an explicit citation relationship in the claims, or may be incorporated into new claims by post-application correction.
- Embodiments of the present invention can be applied to various wireless access systems.
- Examples of various radio access systems include 3GPP LTE systems, 3GPP LTE-A systems, 3GPP2 and / or IEEE 802.16m 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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Abstract
Description
PUCCH 포맷 | UCI |
Format 1 | 스케줄링 요청(SR) |
Format 1a | SR을 포함하거나 포함하지 않는 1비트 HARQ ACK/NACK |
Format 1b | SR을 포함하거나 포함하지 않는 2비트 HARQ ACK/NACK |
Format 2 | CQI(20 coded Bits) |
Format 2 | CQI 및 확장 CP에 대한 1 또는 2 비트의 HARQ ACK/NACK |
Format 2a | CQI 및 1 비트의 HARQ ACK/NACK |
Format 2b | CQI 및 2 비트의 HARQ ACK/NACK |
스케줄링 방식 | 주기적 CQI 전송 | 비주기적 CQI 전송 |
주파수 비선택적 | PUCCH | |
주파수 선택적 | PUCCH | PUSCH |
PMI 피드백 타입 | ||||
No PMI | 단일 PMI | 다중 PMI | ||
PUSCH CQI 피드백 타입 | 광대역(광대역 CQI) | Mode 1-2 | ||
단말 선택(서브밴드 CQI) | Mode 2-0 | Mode 2-2 | ||
상위 계층 구성(서브밴드 CQI) | Mode 3-0 | Mode 3-1 |
PMI 피드백 타입 | |||
No PMI | 단일 PMI | ||
PUSCH CQI 피드백 타입 | 광대역(광대역 CQI) | Mode 1-0 | Mode 1-1 |
단말 선택적(서브밴드 CQI) | Mode 2-0 | Mode 2-1 |
LTE Rel-8 | LTE-A | ||||||||
Case #1 | Case #2 | Case #3 | Case #4 | Case #5 | Case #6 | Case #7 | Case #8 | ||
CSI 타입 1 | RI | RI | L-PMI | RI/L-PMI | RI | L-PMI | RI/L-PMI | RI | L-PMI |
CSI 타입 2 | WB-CQI/PMI | L-PMI | RI | WB-CQI/S-PMI | L-PMI | RI | WB-CQI | WB-CQI/L-PMI | WB-CQI/RI |
CSI 타입 3 | SB-CQI | WB-CQI/S-PMI | WB-CQI/S-PMI | SB-CQI | WB-CQI | WB-CQI | SB-CQI/S-PMI | SB-CQI/S-PMI | SB-CQI/S-PMI |
CSI 타입 4 | SB-CQI | SB-CQI | SB-CQI/S-PMI | SB-CQI/S-PMI |
Claims (15)
- 캐리어 결합을 지원하는 무선 접속 시스템에서 채널상태정보(CSI)를 보고하는 방법에 있어서,단말이 기지국으로부터 하나 이상의 서빙 셀에 대한 CSI 보고 모드와 관련된 정보를 수신하는 단계; 및상기 단말이 상기 CSI 보고 모드를 고려하여 상기 하나 이상의 서빙 셀에 대한 채널상태정보(CSI)를 상기 기지국으로 보고하는 단계를 포함하되,제 1 서빙셀에 대한 제 1 타입 CSI와 제 2 서빙셀에 대한 제 2 타입 CSI가 동일 서브프레임에서 전송되는 경우에는, 상기 단말은 상기 CSI 보고 모드와 관련된 CSI 보고 타입의 우선순위에 따라 하나의 서빙셀에 대한 CSI만을 상기 기지국에 보고하는, CSI 보고방법.
- 제 1항에 있어서,상기 제 1 타입 CSI의 우선순위가 상기 제 2 타입 CSI의 우선순위보다 높으면, 상기 단말은 상기 제 1 타입 CSI만을 상기 기지국에 전송하고 상기 제 2 타입 CSI는 드롭하는, CSI 보고방법.
- 제 2항에 있어서,상기 제 1 타입 CSI는 상기 단말이 상기 RI 및 상기 제 1 PMI 또는 상기 RI 만을 보고하는 것을 나타내고,상기 제 2 타입 CSI는 상기 단말이 상기 WB-CQI 및 상기 제 2 PMI, 상기 WB-CQI 및 상기 제 1 PMI, 또는 상기 WB-CQI만을 상기 기지국에 보고하는 것을 나타내는, CSI 보고방법.
- 제 2항에 있어서,상기 제 1 타입 CSI는 상기 단말이 상기 WB-CQI 및 상기 제 2 PMI, 상기 WB-CQI 및 상기 제 1 PMI, 또는 상기 WB-CQI만을 상기 기지국에 보고하는 것을 나타내고,상기 제 2 타입 CSI는 상기 SB-CQI 및 상기 제 2 PMI 또는 상기 SB-CQI만을 상기 기지국에 보고하는 것을 나타내는, CSI 보고방법.
- 제 2항에 있어서,상기 제 1 타입 CSI는 상기 단말이 상기 RI 및 상기 제 1 PMI 또는 상기 RI 만을 보고하는 것을 나타내고,상기 제 2 타입 CSI는 상기 SB-CQI 및 상기 제 2 PMI 또는 상기 SB-CQI만을 상기 기지국에 보고하는 것을 나타내는, CSI 보고방법.
- 제 2항에 있어서,상기 CSI를 보고하는 단계는 상기 CSI의 각 컨텐츠에 따라 주기적으로 수행되는, CSI 보고방법.
- 제 2항에 있어서,상기 제 1 타입 CSI는 CSI 보고 타입 3 또는 CSI 보고 타입 5이고,상기 제 2 타입 CSI는 CSI 보고 타입 2b, CSI 보고 타입 2c, CSI 보고 타입 4, CSI 보고 타입 1 또는 CSI 보고 타입 1a인, CSI 보고방법.
- 제 2항에 있어서,상기 제 1 타입 CSI는 물리상향링크제어채널(PUCCH) 또는 물리상향링크공유채널(PUSCH)을 통해 상기 기지국으로 전송되는, CSI 보고 방법.
- 캐리어 결합을 지원하는 무선 접속 시스템에서 채널상태정보(CSI)를 보고하는 단말에 있어서, 상기 단말은:채널신호를 전송하기 위한 송신모듈;채널신호를 수신하기 위한 수신모듈; 및상기 CSI 보고를 지원하는 프로세서를 포함하되,기지국으로부터 하나 이상의 서빙 셀에 대한 CSI 보고 모드와 관련된 정보를 상기 수신모듈을 통해 수신하고,상기 CSI 보고 모드를 고려하여 상기 하나 이상의 서빙 셀에 대한 채널상태정보(CSI)를 상기 기지국으로 보고하되,제 1 서빙셀에 대한 제 1 타입 CSI와 제 2 서빙셀에 대한 제 2 타입 CSI가 동일 서브프레임에서 전송되는 경우에는, 상기 단말은 상기 CSI 보고 모드와 관련된 CSI 보고 타입의 우선순위에 따라 하나의 서빙셀에 대한 CSI만을 상기 기지국에 보고하는, 단말.
- 제 9항에 있어서,상기 제 1 타입 CSI의 우선순위가 상기 제 2 타입 CSI의 우선순위보다 높으면, 상기 단말은 상기 제 1 타입 CSI만을 상기 기지국에 전송하고 상기 제 2 타입 CSI는 드롭하는, 단말.
- 제 10항에 있어서,상기 제 1 타입 CSI는 상기 단말이 상기 RI 및 상기 제 1 PMI 또는 상기 RI 만을 보고하는 것을 나타내고,상기 제 2 타입 CSI는 상기 단말이 상기 WB-CQI 및 상기 제 2 PMI, 상기 WB-CQI 및 상기 제 1 PMI, 또는 상기 WB-CQI만을 상기 기지국에 보고하는 것을 나타내는, 단말.
- 제 10항에 있어서,상기 제 1 타입 CSI는 상기 단말이 상기 WB-CQI 및 상기 제 2 PMI, 상기 WB-CQI 및 상기 제 1 PMI, 또는 상기 WB-CQI만을 상기 기지국에 보고하는 것을 나타내고,상기 제 2 타입 CSI는 상기 SB-CQI 및 상기 제 2 PMI 또는 상기 SB-CQI만을 상기 기지국에 보고하는 것을 나타내는, 단말.
- 제 10항에 있어서,상기 제 1 타입 CSI는 상기 단말이 상기 RI 및 상기 제 1 PMI 또는 상기 RI 만을 보고하는 것을 나타내고,상기 제 2 타입 CSI는 상기 SB-CQI 및 상기 제 2 PMI 또는 상기 SB-CQI만을 상기 기지국에 보고하는 것을 나타내는, 단말.
- 제 10항에 있어서,상기 제 1 타입 CSI는 CSI 보고타입 포맷 3 또는 CSI 보고타입 5이고,상기 제 2 타입 CSI는 CSI 보고타입 2b, CSI 보고타입 2c, CSI 보고타입 4, CSI 보고타입 1 또는 CSI 보고타입 1a인, 단말.
- 제 10항에 있어서,상기 제 1 타입 CSI는 물리상향링크제어채널(PUCCH) 또는 물리상향링크공유채널(PUSCH)을 통해 상기 기지국으로 전송되는, 단말.
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CN201510514928.6A CN105187106B (zh) | 2010-04-01 | 2011-04-01 | 在无线接入系统中收发信道状态信息的方法和装置 |
CN201180018039.0A CN102845097B (zh) | 2010-04-01 | 2011-04-01 | 在无线接入系统中发送信道状态信息的方法 |
ES11763083.0T ES2616629T3 (es) | 2010-04-01 | 2011-04-01 | Transmisión de información de estado de canal en un sistema de acceso inalámbrico |
KR1020147006374A KR101486387B1 (ko) | 2010-04-01 | 2011-04-01 | 무선 접속 시스템에서 채널상태정보 전송 방법 |
EP20183018.9A EP3737000B1 (en) | 2010-04-01 | 2011-04-01 | Method for transmitting channel state information in wireless access system |
KR1020127017739A KR101486384B1 (ko) | 2010-04-01 | 2011-04-01 | 무선 접속 시스템에서 채널상태정보 전송 방법 |
EP16191354.6A EP3136618B1 (en) | 2010-04-01 | 2011-04-01 | Transmitting channel state information in wireless access system |
US13/638,514 US8995373B2 (en) | 2010-04-01 | 2011-04-01 | Method for transmitting channel state information in wireless access system |
EP11763083.0A EP2555555B1 (en) | 2010-04-01 | 2011-04-01 | Transmitting channel state information in wireless access system |
US13/734,798 US9100870B2 (en) | 2010-04-01 | 2013-01-04 | Method for transmitting channel state information in wireless access system |
US14/752,610 US9456439B2 (en) | 2010-04-01 | 2015-06-26 | Method for transmitting channel state information in wireless access system |
US15/256,270 US9848412B2 (en) | 2010-04-01 | 2016-09-02 | Method for transmitting channel state information in wireless access system |
US15/782,251 US10051613B2 (en) | 2010-04-01 | 2017-10-12 | Method for transmitting channel state information in wireless access system |
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