WO2012011657A2 - 채널 상태 정보 피드백을 송수신하는 방법 및 그 장치 - Google Patents
채널 상태 정보 피드백을 송수신하는 방법 및 그 장치 Download PDFInfo
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- WO2012011657A2 WO2012011657A2 PCT/KR2011/003408 KR2011003408W WO2012011657A2 WO 2012011657 A2 WO2012011657 A2 WO 2012011657A2 KR 2011003408 W KR2011003408 W KR 2011003408W WO 2012011657 A2 WO2012011657 A2 WO 2012011657A2
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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
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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
- 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
- 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
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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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
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
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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
- 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
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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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
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting and receiving channel state information feedback in a wireless communication system supporting a plurality of component carriers.
- 3GPP LTE (3rd Generation Partnership Project Long Term Evolution, hereinafter referred to as 'LTE'), LTE-Advanced (hereinafter referred to as 'LTE-A') communication Outline the system.
- 'LTE' 3rd Generation Partnership Project Long Term Evolution
- 'LTE-A' LTE-Advanced
- One or more cells exist in one base station.
- the cell provides downlink / uplink transmission service to multiple terminals by setting one of bandwidths of 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz, 20MHz, etc. for one carrier. In this case, different cells may be configured to provide different bandwidths.
- the base station controls data transmission and reception for a plurality of terminals.
- the base station transmits downlink scheduling information on downlink data and informs a corresponding terminal of time / frequency domain, encoding, data size, and hybrid automatic repeat and reQuest (HARQ) related information.
- HARQ hybrid automatic repeat and reQuest
- the base station transmits uplink scheduling information to uplink (uplink, uplink) data to the corresponding terminal to inform the user of the time / frequency domain, encoding, data size, and hybrid automatic retransmission request related information.
- An interface for transmitting user traffic or control traffic may be used between base stations.
- Wireless communication technology has been developed up to LTE based on Wideband Code Division Multiple Access (WCDMA), but the needs and expectations of users and operators continue to increase.
- WCDMA Wideband Code Division Multiple Access
- new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.
- LTE-A LTE-A
- One of the major differences between LTE and LTE-A systems is the difference in system bandwidth and the introduction of repeaters.
- the LTE-A system aims to support broadband of up to 100 MHz, and for this purpose, carrier aggregation (or carrier aggregation) or bandwidth aggregation (or bandwidth aggregation) (carrier aggregation or bandwidth), which achieves broadband using a plurality of frequency blocks.
- carrier aggregation or carrier aggregation
- bandwidth aggregation or bandwidth
- Carrier aggregation technology allows a plurality of frequency blocks to be used as one large logical frequency band in order to use a wider frequency band.
- the bandwidth of each frequency block may be defined based on the bandwidth of the system block used in the LTE system.
- Each frequency block is transmitted using a component carrier (CC).
- CC component carrier
- a terminal may receive a signal from a base station or a repeater of a system supporting a plurality of carriers.
- a method of transmitting and receiving channel state information for each carrier that is, a method of effectively transmitting feedback for each channel state in accordance with a limited frame is required.
- a collision may occur while the UE feeds back channel state information for a plurality of downlink component carriers, respectively. That is, according to the configuration of the feedback method, a situation in which the UE needs to feed back a plurality of carriers simultaneously in the same subframe may occur.
- an object of the present specification is to provide a method for effectively feeding back channel state information in the above situation.
- the present specification is to provide a base station and a terminal capable of performing the method.
- a method of operating a terminal for channel state information (CSI) feedback in a carrier aggregation system includes receiving channel state information feedback configuration (CSI feedback configuration) information for each of a plurality of downlink component carriers from a base station; And based on the received channel state information feedback configuration information, feeding back channel state information to the base station through a physical uplink control channel (PUCCH) of an uplink primary component carrier.
- CSI feedback configuration channel state information feedback configuration
- PUCCH physical uplink control channel
- the one component carrier may be a primary component carrier.
- the channel state information may be a channel quality indicator (CQI), a precoding matrix indicator (PMI), or a rank indicator (RI).
- CQI channel quality indicator
- PMI precoding matrix indicator
- RI rank indicator
- the method may further include receiving priority information set according to the channel state information or the downlink component carrier from the base station.
- the method may further include determining one channel state information.
- the determining of the one channel state information may drop channel state information of the remaining downlink component carriers except the channel state information of the downlink component carrier having the highest priority.
- the channel state information feedback information and priority information may be transmitted through RRC signaling.
- the priority information may be set in association with a Quality of Service (QoS) set for each downlink component carrier.
- QoS Quality of Service
- the priority information may be set according to the number of drops previously performed.
- the priority information may be set to have a priority of wideband channel state information feedback higher than that of subband channel state information feedback.
- the priority information may be set high for a downlink component carrier having a short or long transmission period of channel state information feedback.
- the priority information may be set such that the priority of the channel state information feedback for the self-scheduling component carrier is higher than the priority of the channel state information feedback for the cross-scheduling component carrier. have.
- the priority information may be set such that the priority of the channel state information feedback for the cross-scheduling component carrier is higher than the priority of the channel state information feedback for the self-scheduling component carrier. have.
- the channel state information feedback configuration information may include index information indicating a downlink component carrier corresponding to the channel state information feedback configuration information.
- a terminal for feeding back Channel State Information includes a wireless communication unit for transmitting and receiving a wireless signal with the outside; It may include a control unit connected to the wireless communication unit.
- the control unit controls the wireless communication unit to receive channel state information feedback configuration (CSI feedback configuration) information for each of a plurality of downlink component carriers from a base station; Based on the received channel state information feedback configuration information, the wireless communication unit may be controlled to feed back channel state information to the base station through a physical uplink control channel (PUCCH) of an uplink primary component carrier.
- PUCCH physical uplink control channel
- the channel state information feedback configuration information may be received through one component carrier of the plurality of downlink component carriers or received through each of the plurality of downlink component carriers.
- the one component carrier may be a primary component carrier.
- the channel state information may be a channel quality indicator (CQI), a precoding matrix indicator (PMI), or a rank indicator (RI).
- CQI channel quality indicator
- PMI precoding matrix indicator
- RI rank indicator
- the controller may control the wireless communication unit to receive priority information in which channel state information feedback priority is set according to the channel state information or the downlink component carrier.
- the controller determines one channel state information for feeding back to the base station based on the received priority information. Can be controlled.
- the controller may control to determine the one channel state information by dropping channel state information of the remaining downlink component carriers except for the channel state information of the downlink component carrier for which the priority is set.
- a base station provides a priority of CSI feedback, and a terminal can effectively monitor component carriers by transmitting CSI feedback according to the priority.
- FIG. 1 is a block diagram illustrating a wireless communication system.
- FIG. 2 is a diagram illustrating physical channels used in a 3GPP system and a general signal transmission method using the same.
- 3 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system.
- FIG. 4 is a diagram illustrating the structure of downlink and uplink subframes of a 3GPP LTE system as an example of a mobile communication system.
- FIG. 5A illustrates a concept of managing a multicarrier by a plurality of MACs in a base station
- FIG. 5B illustrates a concept of managing a multicarrier by a plurality of MACs in a terminal.
- FIG. 6A illustrates a concept in which one MAC manages multicarriers in a base station.
- 6B is a diagram for describing a concept in which one MAC manages multicarriers in a terminal.
- FIG. 7 is a diagram illustrating an example of a multi-carrier.
- FIG 8 is a diagram illustrating an example of cross-carrier scheduling.
- CC 9 illustrates an example of a component carrier (CC) set.
- FIG. 10 is a diagram illustrating an example of channel state information feedback.
- FIG. 11 is a flowchart illustrating a method of operating a terminal for CSI feedback in a carrier aggregation system according to an embodiment.
- FIG. 12 is a flowchart illustrating a method of receiving a CSI feedback by a base station in a carrier aggregation system according to an embodiment of the present specification.
- FIG. 13 is a block diagram of a terminal and a base station according to one embodiment of the present specification.
- the present invention is applied when the mobile communication system is a 3GPP LTE, LTE-A system.
- the present invention is not limited thereto, and may be applied to all communication systems, methods, and other systems to which the technical spirit of the present invention may be applied, except for the specific aspects of 3GPP LTE and LTE-A.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- the terminal may include a user equipment (UE), a mobile equipment (ME), a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device (Wireless Device), It may be called a handheld device or an access terminal (AT).
- the terminal may be a portable device having a communication function such as a mobile phone, a PDA, a smart phone, a wireless modem, a laptop, or the like, or a non-portable device such as a PC or a vehicle-mounted device.
- the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
- the repeater may be referred to as a relay node (RN), a relay station (RS), a relay, or the like.
- a user equipment and a repeater may receive information from a base station through downlink, and the terminal and repeater may also transmit information through uplink.
- the information transmitted or received by the terminal and the repeater includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal and the repeater.
- FIG. 1 is a conceptual diagram illustrating a wireless communication system.
- E-UMTS Evolved-Universal Mobile Telecommunications System
- LTE Long Term Evolution
- LTE-A Long Term Evolution-A
- an Evolved-UMTS Terrestrial Radio Access Network includes a base station (BS) 20 that provides a control plane and a user plane.
- BS base station
- the UE 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, and the like.
- MS mobile station
- UT user terminal
- SS subscriber station
- wireless device and the like.
- the base station 20 generally refers to a fixed station communicating with the terminal 10, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point. have.
- eNB evolved-NodeB
- BTS base transceiver system
- One or more cells may exist in one base station 20.
- An interface for transmitting user traffic or control traffic may be used between the base stations 20.
- downlink means communication from the base station 20 to the terminal
- uplink means communication from the terminal 10 to the base station 20.
- the base stations 20 may be connected to each other through an X2 interface.
- the base station 20 is connected to an Evolved Packet Core (EPC), more specifically, a Mobility Management Entity (MME) / Serving Gateway (S-GW) 30 through an S1 interface.
- EPC Evolved Packet Core
- MME Mobility Management Entity
- S-GW Serving Gateway
- FIG. 2 is a diagram illustrating physical channels used in a 3GPP system and a general signal transmission method using the same.
- the UE When the UE is powered on or enters a new cell, the UE performs an initial cell search operation such as synchronizing with the base station (S301). To this end, the terminal may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. have. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- DL RS downlink reference signal
- the UE After the initial cell search, the UE acquires more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information on the PDCCH. It may be (S302).
- a physical downlink control channel (PDCCH)
- a physical downlink control channel (PDSCH)
- S302 the UE acquires more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information on the PDCCH. It may be (S302).
- PDCCH physical downlink control channel
- PDSCH physical downlink control channel
- the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
- RACH random access procedure
- the UE may transmit a specific sequence to the preamble through a physical random access channel (PRACH) (S303 and S305), and receive a response message for the preamble through the PDCCH and the corresponding PDSCH ( S304 and S306).
- PRACH physical random access channel
- a contention resolution procedure may be additionally performed.
- the UE After performing the above-described procedure, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink) as a general uplink / downlink signal transmission procedure.
- Control Channel (PUCCH) transmission (S308) may be performed.
- Information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI) Include.
- the terminal may transmit the above-described information, such as CQI / PMI / RI through the PUSCH and / or PUCCH.
- 3 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system.
- one radio frame has a length of 10 ms (327200 Ts) and consists of 10 equally sized subframes.
- Each subframe has a length of 1 ms and consists of two slots.
- Each slot has a length of 0.5 ms (15360 Ts).
- 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 resource block includes 12 subcarriers x 7 (6) OFDM symbols or a SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol.
- Transmission time interval which is a unit time for transmitting data, may be determined in units of one or more subframes.
- the structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe, the number of OFDM symbols or SC-FDMA symbols included in the slot may be variously changed. have.
- FIG. 4 is a diagram illustrating the structure of downlink and uplink subframes of a 3GPP LTE system as an example of a mobile communication system.
- one downlink subframe includes two slots in the time domain. Up to three OFDM symbols of the first slot in the downlink subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated.
- PDSCH Physical Downlink Shared Channel
- Downlink control channels used in 3GPP LTE systems include a PCFICH (Physical Control Format Indicator Channel), PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid-ARQ Indicator Channel).
- the PCFICH transmitted in the first OFDM symbol of the subframe carries information on the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- Control information transmitted through the PDCCH is called downlink control information (DCI).
- DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups.
- the PHICH carries an ACK (Acknowledgement) / NACK (Not-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.
- ACK Acknowledgement
- NACK Not-Acknowledgement
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- the control region is allocated to a Physical Uplink Control Channel (PUCCH) that carries uplink control information.
- the data area is allocated to a Physical Uplink Shared Channel (PUSCH) for carrying user data.
- PUCCH Physical Uplink Control Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH for one UE is allocated to an RB pair in one subframe. RBs belonging to the RB pair occupy different subcarriers in each of two slots. The RB pair assigned to the PUCCH is frequency hopped at the slot boundary.
- the 3GPP LTE system supports a case in which downlink bandwidth and uplink bandwidth are set differently, but this assumes one component carrier (hereinafter, referred to as CC).
- CC component carrier
- 3GPP LTE is supported only when the bandwidth of the downlink and the bandwidth of the uplink are the same or different in the situation where one CC is defined for the downlink and the uplink, respectively.
- the 3GPP LTE system supports up to 20MHz and may be different in uplink bandwidth and downlink bandwidth, but only one CC is supported in the uplink and the downlink.
- Carrier aggregation (or carrier aggregation, also referred to as spectrum aggregation) is to support a plurality of CC.
- Carrier aggregation is introduced to support increased throughput, to prevent cost increase due to the introduction of wideband radio frequency (RF) devices, and to ensure compatibility with existing systems. For example, if five CCs are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
- RF radio frequency
- Carrier aggregation may be divided into contiguous carrier aggregation where aggregation is formed between consecutive carriers in the frequency domain and non-contiguous carrier aggregation where aggregation is between discontinuous carriers.
- the number of CCs aggregated between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
- the component carrier may be referred to as a 'cell'.
- 'Cell' means a combination of downlink resources and optionally uplink resources.
- the linking between the carrier frequency of the downlink resources and the carrier frequency of the uplink resources can be known as system information transmitted through the downlink resources.
- a 'cell' may mean a pair of a downlink component carrier and an uplink component carrier or only a downlink component carrier.
- the uplink component carrier refers to a component carrier in which a linkage is set with the downlink component carrier.
- 'cell' may be used as a concept of a downlink CC and a pair of uplink CC, or may be used as a term meaning a downlink CC.
- 'cell' should be distinguished from 'cell' as an area covered by a base station that is generally used.
- a 'cell' and a component carrier CC may be used interchangeably, and in this case, the expression 'cell' refers to the component carrier CC described above.
- the size (ie bandwidth) of the CC may be different. For example, if 5 CCs are used for the configuration of the 70 MHz band, 5 MHz carrier (CC # 0) + 20 MHz carrier (CC # 1) + 20 MHz carrier (CC # 2) + 20 MHz carrier (CC # 3) It may be configured as a + 5 MHz carrier (CC # 4).
- the configuration of the physical layer (PHY) and layer 2 (layer 2 (MAC)) for the transmission for a plurality of uplink or downlink carrier bands allocated from the position of any cell or terminal is shown in FIG. And as shown in FIG. 6.
- FIG. 5A is a diagram illustrating a concept of managing a multicarrier by a plurality of MACs in a base station
- FIG. 5B is a diagram for explaining a concept of managing a multicarrier by a plurality of MACs in a terminal.
- each carrier may control 1: 1 by each MAC.
- each carrier may be used contiguously or non-contiguous. This can be applied to the uplink / downlink irrespective.
- the TDD system is configured to operate N multiple carriers including downlink and uplink transmission in each carrier, and the FDD system is configured to use multiple carriers for uplink and downlink, respectively.
- asymmetric carrier merging may be supported in which the number of carriers and / or the bandwidth of the carriers are merged in uplink and downlink.
- FIG. 6 (a) is a diagram for explaining a concept of managing a multicarrier by one MAC in a base station
- FIG. 6 (b) is a diagram for explaining a concept of one MAC managing a multicarrier in a terminal. .
- one MAC manages and operates one or more frequency carriers to perform transmission and reception. Frequency carriers managed in one MAC do not need to be contiguous with each other, which is advantageous in terms of resource management.
- one PHY means one CC for convenience.
- one PHY does not necessarily mean an independent radio frequency (RF) device.
- RF radio frequency
- one independent RF device means one PHY, but is not limited thereto, and one RF device may include several PHYs.
- channel, PDCCH may be transmitted by mapping to a physical resource in an individual CC.
- the PDCCH for channel allocation or grant-related control information related to PDSCH or PUSCH (physical uplink shared channel) transmission which is unique to an individual UE, may be generated as a PDCCH encoded and separated for each CC on which the corresponding physical shared channel is transmitted. Can be. This is referred to as separate coded PDCCH.
- control information for physical shared channel transmission of various component carriers may be configured and transmitted as one PDCCH, which is referred to as a joint coded PDCCH.
- a base station In order to support downlink or uplink carrier aggregation, a base station is configured such that a PDCCH and / or PDSCH for transmitting control information and / or data transmission can be transmitted uniquely for a specific terminal or repeater, or the PDCCH And / or component carriers that are subject to measurement and / or reporting as preparation for performing connection establishment for PDSCH transmission. This is expressed as component carrier allocation for any purpose.
- the radio resource control (RRC) signaling (terminal-specific or repeater) unique to a series of terminals or repeaters according to the dynamic characteristics of the control (dynamic) Specific RRC signaling) or L1 / L2 control signaling may be transmitted through a series of PDCCHs or through a series of dedicated physical control channels for only transmission of this control information.
- RRC radio resource control
- PDCCH and PDSCH are independently transmitted in each downlink CC
- PUCCH and PUSCH are independently transmitted in each uplink CC.
- the multiple carrier system refers to a system supporting multiple carriers based on carrier aggregation, as described above.
- Adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used in a multi-carrier system, and either symmetric aggregation or asymmetric aggregation may be used.
- linkage between a downlink CC and an uplink CC may be defined.
- the linkage may be configured through EARFCN information included in the downlink system information, and is configured using a fixed downlink / uplink Tx / Rx separation relationship.
- the linkage refers to a mapping relationship between a downlink CC on which a PDCCH carrying an uplink grant is transmitted and an uplink CC using the uplink grant.
- the linkage may be a mapping relationship between a downlink CC (or uplink CC) through which data for HARQ is transmitted and an uplink CC (or downlink CC) through which HARQ ACK / NACK signal is transmitted.
- the linkage information may be informed to the terminal by the base station as part of a higher layer message or system information such as an RRC message.
- the linkage between the downlink CC and the uplink CC may be fixed, but may be changed between cells / terminals.
- the split coded PDCCH means that the PDCCH can carry control information such as resource allocation for PDSCH / PUSCH for one carrier. That is, the PDCCH and PDSCH, the PDCCH and the PUSCH correspond to 1: 1 respectively.
- a joint coded PDCCH means that one PDCCH can carry resource allocation for PDSCH / PUSCH of a plurality of CCs.
- One PDCCH may be transmitted through one CC or may be transmitted through a plurality of CCs.
- CC scheduling is possible in two ways.
- the first is that a PDCCH-PDSCH pair is transmitted in one CC.
- This CC is called a self-secheduling CC.
- the PDCCH allocates PDSCH resources on the same CC or allocates PUSCH resources on the linked uplink CC.
- the downlink CC on which the PDSCH is transmitted or the uplink CC on which the PUSCH is transmitted is determined. That is, the PUSCH is transmitted through a downlink CC having different PDCCHs and PDSCHs or an uplink CC which is not linked with a downlink CC having PDCCHs. This is called cross-carrier scheduling.
- the CC on which the PDCCH is transmitted may be referred to as a PDCCH carrier, a monitoring carrier, or a scheduling carrier, and the CC on which the PDSCH / PUSCH is transmitted may be referred to as a PDSCH / PUSCH carrier or a scheduled carrier.
- the cross-carrier scheduling may be activated / deactivated for each terminal, and the terminal on which the cross-carrier scheduling is activated may receive a DCI including a carrier indicator field (CIF).
- the UE may know which scheduled CC the PDCCH received from the CIF included in the DCI is control information.
- the downlink-uplink linkage predefined by cross-carrier scheduling may be overriding. That is, the cross carrier scheduling may schedule a CC other than the linked CC regardless of the downlink-uplink linkage.
- downlink CC # 1 and uplink CC # 1 are linked
- downlink CC # 2 and uplink CC # 2 are linked
- downlink CC # 3 and uplink CC # 3 are linked.
- the first PDCCH 1401 of the downlink CC # 1 carries the DCI for the PDSCH 1402 of the same downlink CC # 1.
- the second PDCCH 1411 of the downlink CC # 1 carries the DCI for the PDSCH 1412 of the downlink CC # 2.
- the third PDCCH 1421 of the downlink CC # 1 carries a DCI for the PUSCH 1422 of the uplink CC # 3 that is not linked.
- the DCI of the PDCCH may include a carrier indicator field (CIF).
- the CIF indicates a downlink CC or an uplink CC scheduled through the DCI.
- the second PDCCH 1411 may include a CIF indicating a downlink CC # 2.
- the third PDCCH 1421 may include a CIF indicating uplink CC # 3.
- the CIF of the third PDCCH 1421 may be notified of the CIF value corresponding to the downlink CC, not the CIF value corresponding to the uplink CC.
- the CIF of the third PDCCH 1421 may indicate indirectly the uplink CC # 3 scheduled by the PUSCH by indicating the downlink CC # 3 linked with the uplink CC # 3. This is because if the DCI of the PDCCH includes PUSCH scheduling and the CIF indicates a downlink CC, the UE may determine that the PUSCH is scheduled on the uplink CC linked with the downlink CC. Through this, it is possible to indicate a larger number of CCs than a method of notifying all downlink / uplink CCs using a CIF having a limited bit length (for example, a 3-bit CIF).
- a UE using cross-carrier scheduling needs to monitor PDCCHs of a plurality of scheduled CCs for the same DCI format in a control region of one scheduling CC. For example, if a transmission mode of each of the plurality of downlink CCs is different, a plurality of PDCCHs for different DCI formats may be monitored in each downlink CC. Even if the same transmission mode is used, if the bandwidth of each downlink CC is different, a plurality of PDCCHs may be monitored because the payload size of the DCI format is different under the same DCI format.
- the UE needs to monitor 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.
- UE downlink CC set a set of downlink CC scheduled for the UE to receive the PDSCH
- UE uplink CC set a set of uplink CC scheduled for the UE to transmit a PUSCH
- PDCCH monitoring set A set of at least one DL CC that performs PDCCH monitoring.
- the PDCCH monitoring set may be the same as the UE downlink CC set or a subset of the UE downlink CC set.
- the PDCCH monitoring set may include at least one of downlink CCs in the UE downlink CC set. Alternatively, the PDCCH monitoring set may be defined separately regardless of the UE downlink CC set.
- the downlink CC included in the PDCCH monitoring set may be configured to always enable self-scheduling for the linked uplink CC.
- the UE downlink CC set, the UE uplink CC set and the PDCCH monitoring set may be configured to be cell-specific or UE-specific.
- FIG. 9 shows an example of a CC set. 4 downlink CCs (downlink CC # 1, # 2, # 3, # 4) as the UE downlink CC set, 2 uplink CCs (uplink CC # 1, # 2) as the UE uplink CC set, Assume that two downlink CCs (downlink CC # 2, # 3) are allocated to the UE as a PDCCH monitoring set.
- the downlink CC # 2 in the PDCCH monitoring set transmits the PDCCH for the PDSCH of the downlink CC # 1 / # 2 in the UE downlink CC set and the PDCCH for the PUSCH of the uplink CC # 1 in the UE uplink CC set.
- the downlink CC # 3 in the PDCCH monitoring set transmits the PDCCH for the PDSCH of the downlink CC # 3 / # 4 in the UE downlink CC set and the PDCCH for the PUSCH of the uplink CC # 2 in the UE uplink CC set.
- Linkages may be configured between CCs included in the UE downlink CC set, the UE uplink CC set, and the PDCCH monitoring set.
- the PDCCH-PDSCH linkage is set between the downlink CC # 2 which is the scheduling CC and the downlink CC # 1 which is the scheduled CC
- the PDCCH-PUSCH linkage is set for the downlink CC # 2 and the uplink CC # 1. It is set.
- a PDCCH-PDSCH linkage is set between a downlink CC # 3 that is a scheduling CC and a downlink CC # 4 that is a scheduled CC, and a PDCCH-PUSCH linkage is configured for the downlink CC # 3 and the uplink CC # 2.
- the information about the scheduling CC or the PDCCH-PDSCH / PUSCH linkage information may be informed by the base station to the terminal through cell-specific signaling or terminal-specific signaling.
- both the downlink CC and the uplink CC may not be linked to each of the downlink CCs in the PDCCH monitoring set.
- the uplink CC for PUSCH transmission may be limited to an uplink CC linked to the downlink CC in the UE downlink CC set. .
- the CIF may be set differently according to linkages of the UE downlink CC set, the UE uplink CC set, and the PDCCH monitoring set.
- channel state information hereinafter, referred to as CSI
- CSI channel state information
- CSI refers to information indicating a channel state of a transmission link (eg, downlink) collected by the UE by measuring a reference signal.
- the channel state information may include, for example, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and the like. Or it may mean information derived by the CQI / PMI / RI.
- the terminal feeds back the CSI to the base station.
- the channel state information may be fed back through various information.
- the channel state information may be fed back through PMI, CQI, RI, or the like.
- the terminal performs channel measurement using a reference signal transmitted by the base station, and feeds back the preferred PMI and RI to the base station based on the channel measurement result.
- Preferred PMI and RI may be PMI and RI determined to be able to achieve the highest data rates when used by a base station under a given channel condition.
- the CQI represents a modulation and coding scheme (MCS) that guarantees an appropriate packet error rate in the PMI and the RI fed back by the UE.
- MCS modulation and coding scheme
- the base station may use channel state information fed back by the terminal for scheduling.
- FIG. 10 is a diagram illustrating an example of CSI feedback.
- the UE may transmit the UE selected subband feedback periodically on the PUCCH.
- one bandwidth part may consist of N_J CQI subbands
- one CQI subband may consist of k RBs.
- the UE may select one subband for each BP and feed back a corresponding CSI period once for a set S (whole BW).
- collision may occur during feedback of CSIs (CQI / PMI / RI) for various downlink CCs.
- CQI / PMI / RI CSIs
- the PUCCH can be transmitted only in a single uplink primary CC (PCell) specified in advance, the terminal entry according to the configuration of the CSI
- PCell uplink primary CC
- IMD intermodulation distortion
- FIG. 11 is a flowchart illustrating a method of operating a terminal for CSI feedback in a carrier aggregation system according to an embodiment.
- the CC may be one of a Primary CC (PCell) or a Secondary CC (Secondary Cell, SCell), and the PCell may be a cell in which the terminal performs initial access. It is assumed that the cell may be reconfigured through RRC (Radio Resource Control) signaling.
- PCell Primary CC
- SCell Secondary CC
- RRC Radio Resource Control
- the terminal may receive CSI feedback configuration information from the base station (S120).
- the CSI feedback configuration information is information that the UE refers to for CSI feedback and may include information such as a CC to which the CSI is to be fed back, a structure of a feedback frame, and may include a priority of the CSI feedback.
- the CSI feedback configuration information may be received by RRC signaling.
- the terminal may receive the CSI feedback configuration information together with one or more control information at the time of receiving specific control information.
- the periodic CSI feedback is transmitted through the PUCCH, regardless of the carrier aggregation type, the CSI feedback is always transmitted through the uplink PCell.
- the periodic CSI feedback for each downlink CC (Cell) is configured independently.
- the signaling of the periodic CSI feedback configuration information of the independent downlink CC may vary according to which downlink CC (Cell) is transmitted.
- the terminal may receive the CSI feedback configuration information for the corresponding downlink CC through each downlink CC (Cell).
- the base station can deliver the CSI feedback configuration information through higher layer signaling of the type provided by 3GPP LTE Rel-8 without any other signaling. Also, the CSI feedback may be performed without ambiguity through the information. For the activated SCells, the CSI feedback configuration information may be received through higher layer signaling of each SCell.
- the terminal may receive CSI feedback configuration information for one or more downlink CCs (Cells) through a primary CC (PCC or PCell).
- Cells downlink CCs
- PCC or PCell primary CC
- the terminal may receive the CSI feedback configuration information of all downlink cells including the PCell through the PCell.
- the terminal may receive the CSI feedback configuration information for the PCell and the deactivated SCells through the PCell, and may receive the CSI feedback configuration information of the activated SCell through each SCell.
- a downlink CC index (physical index or logical index or 3-bit CIF) may be received together so that the downlink CC knows which downlink CC the information is about.
- the UE may receive the CSI feedback configuration information transmitted through higher layer signaling and then transmit the CSI feedback accordingly.
- the terminal receives the CSI feedback configuration information of all the downlink CCs in the downlink PCC without the downlink CC index, it may be difficult for the terminal to know which downlink CC received information.
- the downlink PCell and the downlink SCell may have different bandwidths, ambiguity may occur in subband size k or bandwidth parts J, which may vary according to bandwidth.
- CSI feedback may also be required for configured and deactivated SCells as well as configured and activated SCells, and thus CSI feedback for deactivated SCells may also be needed. Since the terminal does not monitor the deactivated SCells, the corresponding SCell cannot receive CSI feedback related information. Accordingly, the CSI feedback configuration information for the deactivated SCell may be received through higher layer signaling along with the CC index.
- the CSI feedback configuration information for the PCell uses the form of 3GPP LTE Rel-8 as it is, and the CSI feedback configuration information for the remaining SCells is the PCell information. It may also be received in the form of a delta of.
- the UE may receive CSI feedback configuration information of one or more downlink CCs (Cells) through an arbitrary downlink CC (Cell).
- Cells downlink CCs
- Cell arbitrary downlink CC
- the IE regarding the CSI feedback configuration information may be placed in the configuration information element (IE) of the downlink CC.
- the UE can know which downlink cell corresponding to the CSI feedback configuration information.
- the CSI feedback configuration information for the PCell or the self-scheduling CC uses the form of 3GPP LTE Rel-8 as it is.
- the CSI feedback configuration information for the remaining downlink cells may be received in a delta form.
- the terminal may store and manage the received CSI feedback configuration information.
- the terminal may measure the CSI for each CC for the CSI feedback (S130).
- the terminal processes the information on the measured CSI according to the CSI feedback configuration information.
- the UE may need to simultaneously feed back CSI for a plurality of CCs in the same subframe (S140).
- the UE may drop predetermined information according to the CSI feedback priority (S150).
- the CSI feedback priority may be received in a form included in the CSI feedback configuration information or may be separately received.
- the CSI feedback priority may be set for RI, PMI, and CQI, respectively.
- transmission of CQI and / or PMI for downlink SCell # 0 and RI for downlink SCell # 1 occur in the same subframe, transmission of CQI and / or PMI having a lower priority is required. Can be dropped.
- the CSI feedback priority may be set for each of the downlink CCs.
- the priority of the feedback for the downlink PCell may be set higher. Specifically, when feedback on CQI, PMI or RI for downlink PCell and CQI, PMI or RI for downlink SCell # 1 and SCell # 2 occurs in the same subframe, PCell having a higher priority Only feedback for and may send feedback for SCell # 1 and SCell # 2.
- the feedback may be performed by a predetermined priority relationship between the SCells. For example, if feedback for a cell having the lowest (or high) physical / logical index has priority, only feedback for the cell may be transmitted. That is, when the feedback for SCell # 1 and SCell # 2 collide, only feedback for SCell # 1 having the lowest index may be transmitted and feedback for SCell # 2 may be dropped. If the terminal receives the priority of downlink PCell> SCell # 2> SCell # 1> SCell # 0, the terminal may drop according to the above priority.
- the priority may be set in association with a quality of service (QoS) set for each downlink cell. That is, a downlink cell having a relatively high QoS may have a high priority of CSI feedback. Such QoS may also be received by the terminal.
- QoS quality of service
- the priority may be set according to the number of drop of the feedback.
- the drop number of the two is large (or small).
- Feedback for the downlink SCell may be dropped.
- the priority of the wideband (WB) CQI feedback may be higher than that of the subband (SB) CQI feedback. That is, when the subband feedback in the downlink PCell and the broadband feedback in the downlink SCell # 2 occur in the same subframe, the CSI for the downlink SCell # 2 is fed back and the CSI feedback for the downlink PCell is dropped ( drop).
- the CSI feedback for a downlink cell having a short transmission period may have a high priority.
- the shorter transmission period means that the carrier aggregation system considers the downlink cell to be important, and therefore, the priority may be set higher in the corresponding cell.
- the CSI feedback for the downlink cell with a long transmission period may have a high priority. Longer transmission cycles mean fewer opportunities for feedback from the CSI, so dropping the CSI will result in more feedback opportunities. Therefore, the higher the priority of the CSI feedback for downlink cells with longer transmission periods, Can be set.
- the priority may be set according to a type of CC scheduling (self-scheduling and cross-scheduling).
- the CSI feedback for the self-scheduling CC may be set to have a higher priority than the CSI feedback for the cross-scheduling CC (cross-scheduling SCell). That is, when a CSI feedback collision occurs, the CSI feedback for the self-scheduling CC may be transmitted and the CSI feedback for the cross-scheduling CC may be dropped.
- the CSI feedback for the cross-scheduling CC may be set to have a higher priority than the CSI feedback for the self-scheduling. That is, when a CSI feedback collision occurs, the CSI feedback for the cross-scheduling CC can be transmitted and the CSI feedback for the self-scheduling CC can be dropped.
- RI priority and PCell priority may be used simultaneously. That is, the RI of the PCell may be given the highest priority, and the RIs of the SCells have the next priority, the CQI / PMI of the PCell has the next priority, and the CQI / PMI of the SCells have the next priority.
- This combination of priorities may be received in the form included in the CSI feedback configuration information or may be received separately.
- the UE may jointly code the corresponding CSIs as a variation of the operation method of the UE.
- the CSI for the downlink PCell and the CSI for the downlink SCell # 1 should be transmitted in the same subframe, the corresponding CSI may be jointly coded and transmitted.
- the total information bit size to be joint-coded exceeds 11 or 13 bits that can be accommodated in PUCCH format 2, it may be transmitted using an MSM or DFT-S-OFDM infrastructure.
- the CSI for the downlink PCell since the front part of the information bit stream has higher reliability due to the nature of Reed-Muller (RM) coding, the CSI for the downlink PCell may be located in the front part (or for a downlink cell having a high priority). CSI can be located.
- RI since it may be undesirable to drop the RI in the CSI (CQI / PMI drops), only RI may be joint coded. Since RI is a maximum of 2 bits per CC, a total of 10 bits must be joint coded for 5 downlink CCs, and this size can be accommodated in PUCCH format 2. At this time, since the front part of the information bit stream has higher reliability due to the characteristics of RM coding, the RI for the downlink PCell may be located in the front part.
- the terminal transmits the CSI feedback generated through the drop to the base station (S160).
- the CSI feedback generated through joint coding is transmitted to the base station.
- FIG. 12 is a flowchart illustrating a method of receiving a CSI feedback by a base station in a carrier aggregation system according to an embodiment of the present specification.
- the base station may set the priority of the CSI feedback (S200).
- the priority is considered in order for the UE to drop certain information among the CSI feedback when the UE needs to simultaneously feed back CSI for multiple CCs or cells in the same subframe. Information.
- Various embodiments of the CSI feedback priority have been described above.
- the base station may set, change, and manage the priority.
- the base station may transmit the CSI feedback configuration information and the CSI feedback priority to the terminal (S220).
- the CSI feedback configuration information is information required for CSI feedback by the UE, and may include information such as a feedback CC, a structure of a feedback frame, and may include a priority of the CSI feedback.
- the base station may transmit CSI feedback configuration information and the CSI feedback priority by Radio Resource Control (RRC) signaling.
- RRC Radio Resource Control
- the base station may also transmit the priority together with one or more control information at the time of transmission of the specific control information.
- Each embodiment of transmitting the CSI feedback configuration information is as described above.
- the terminal receiving the CSI feedback configuration information may measure CSI for each CC and feed back to the base station.
- the UE may drop predetermined information according to the CSI feedback priority and transmit the same to the base station.
- joint coding may be performed to the base station.
- the base station may receive the CSI feedback transmitted by the terminal (S260).
- Embodiments and modifications described above may be combined. Accordingly, the embodiments may not be implemented alone, but may be implemented in combination as necessary. Such a combination can be easily implemented by those skilled in the art after reading the present specification, and the combination will not be described in detail below. However, even if not described is not excluded from the present invention, it should be construed as being included in the scope of the present invention.
- Embodiments and modifications described above may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
- a 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.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the method according to the present invention may be stored in a storage medium (eg, internal memory, flash memory, hard disk, etc.) and may be executed by a processor (eg a microprocessor). It can be implemented as codes or instructions within a program.
- a storage medium eg, internal memory, flash memory, hard disk, etc.
- a processor eg a microprocessor
- FIG. 13 is a block diagram illustrating elements of a terminal and a base station.
- the terminal 10 includes a control unit 11, a memory 12, and a wireless communication unit 13.
- the terminal also includes a display unit, a user interface unit, and the like.
- the controller 11 implements the proposed function, process and / or method. Layers of the air interface protocol may be implemented by the controller 11.
- the control unit 11 may control the wireless communication unit to receive channel state information feedback configuration (CSI feedback configuration) information for each of the plurality of downlink CC from the base station.
- the controller 11 may control the wireless communication unit to receive priority information set according to the CSI or the downlink CC from the base station.
- CSI feedback configuration channel state information feedback configuration
- the controller 11 may control the wireless communication unit to feed back CSI through the PUCCH of the uplink primary CC based on the received CSI feedback configuration information.
- the controller 11 may control to determine one CSI for feeding back to the base station based on the received priority information. have. In addition, the control unit 11 may control to determine the one CSI by dropping the CSI of the remaining downlink CC excluding the CSI of the downlink CC having the highest priority.
- the memory 12 is connected to the control unit 11 and stores a protocol or parameter for performing wireless communication. That is, it stores the terminal driving system, the application, and the general file.
- the wireless communication unit 13 is connected to the control unit 11 to transmit and / or receive a radio signal.
- the display unit displays various information of the terminal, and may use well-known elements such as liquid crystal display (LCD) and organic light emitting diodes (OLED).
- the user interface may be a combination of a well-known user interface such as a keypad or a touch screen.
- the base station 20 includes a control unit 21, a memory 22, and a radio frequency unit (RF) unit 23.
- RF radio frequency unit
- the control unit 21 implements the proposed function, process and / or method. Layers of the air interface protocol may be implemented by the controller 21.
- the controller 21 may set the CSI feedback configuration information and the CSI feedback priority. In addition, the controller 21 may change and manage the priority. The controller 21 may control the wireless communication unit 23 to transmit CSI feedback configuration information and the CSI feedback priority to the terminal.
- the controller 21 may control the wireless communication unit 23 to receive the CSI feedback transmitted by the terminal.
- the memory 22 is connected to the control unit 21 to store a protocol or parameter for performing wireless communication.
- the wireless communication unit 23 is connected to the control unit 21 to transmit and / or receive a radio signal.
- the controllers 11 and 21 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device.
- the memories 12 and 22 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
- the wireless communication units 13 and 23 may include baseband circuits for processing wireless signals.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in the memories 12 and 22 and executed by the controllers 11 and 21.
- the memories 12 and 22 may be inside or outside the controllers 11 and 21, and may be connected to the controllers 11 and 21 by various well-known means.
- the base station has a meaning as a terminal node of a network that directly communicates with the terminal. Certain operations described as being performed by a base station in this document may be performed by an upper node of the base station in some cases.
- the base station may be replaced by terms such as a fixed station, a Node B, an eNodeB, and an access point.
- the terminal may be replaced with terms such as a terminal or a mobile station (MS), a subscriber station (SS), a mobile subscriber station (MSS), and the like.
Abstract
Description
Claims (20)
- 반송파 집성(carrier aggregation) 시스템에서, 채널 상태 정보(Channel State Information: CSI) 피드백을 위한 단말의 동작 방법에 있어서,복수의 하향링크 컴포넌트 캐리어 각각에 대한 채널 상태 정보 피드백 구성(CSI feedback configuration) 정보를 기지국으로부터 수신하는 단계;상기 수신된 채널 상태 정보 피드백 구성 정보에 기초하여, 상향링크 프라이머리 컴포넌트 캐리어의 물리 상향링크 제어 채널(Physical Uplink Control Channel: PUCCH)을 통해 채널 상태 정보를 상기 기지국으로 피드백하는 단계를 포함하되,상기 채널 상태 정보 피드백 구성 정보는 상기 복수의 하향링크 컴포넌트 캐리어 중 어느 하나의 컴포넌트 캐리어를 통해 수신되거나 상기 복수의 하향링크 컴포넌트 캐리어 각각을 통해 수신되는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 어느 하나의 컴포넌트 캐리어는 프라이머리 컴포넌트 캐리어(Primary Component Carrier)인 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 채널 상태 정보는 CQI(channel quality indicator), PMI(precoding matrix indicator) 또는 RI(rank indicator)인 것을 특징으로 하는 방법.
- 제 3항에 있어서,상기 채널 상태 정보 또는 하향링크 컴포넌트 캐리어에 따라 설정된 우선 순위 정보를 상기 기지국으로부터 수신하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 제 4항에 있어서,상기 복수의 하향링크 컴포넌트 캐리어 각각에 대한 채널 상태 정보를 동시에 상기 기지국으로 피드백 해야 하는 경우, 상기 수신된 우선 순위 정보에 기초하여 상기 기지국으로 피드백하기 위한 하나의 채널 상태 정보를 결정하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 제 5항에 있어서, 상기 하나의 채널 상태 정보를 결정하는 단계는,상기 우선 순위가 가장 높은 하향링크 컴포넌트 캐리어에 대한 채널 상태 정보를 제외한 나머지 하향링크 컴포넌트 캐리어들의 채널 상태 정보를 드롭(drop)하는 것을 특징으로 하는 방법.
- 제 1항 또는 제 4항에 있어서,상기 채널 상태 정보 피드백 정보 및 우선 순위 정보는 RRC 시그널링을 통해 전송되는 것을 특징으로 하는 방법.
- 제 4항에 있어서, 상기 우선 순위 정보는,각각의 하향링크 컴포넌트 캐리어에 대하여 설정된 서비스 품질(Quality of Service: QoS)과 연계하여 설정되는 것을 특징으로 하는 방법.
- 제 4항에 있어서, 상기 우선 순위 정보는,상기 채널 상태 정보 피드백의 드롭(drop) 횟수에 따라 설정되는 것을 특징으로 하는 방법.
- 제 4항에 있어서, 상기 우선 순위 정보는,광대역(wideband) 채널 상태 정보 피드백의 우선 순위가 부대역(subband) 채널 상태 정보 피드백의 우선 순위보다 높게 설정되는 것을 특징으로 하는 방법.
- 제 4항에 있어서, 상기 우선 순위 정보는,채널 상태 정보 피드백의 전송 주기가 짧거나 긴 하향링크 컴포넌트 캐리어에 대해 높게 설정되는 것을 특징으로 하는 방법.
- 제 4항에 있어서, 상기 우선 순위 정보는,자기-스케줄링(self-scheduling) 컴포넌트 캐리어에 대한 채널 상태 정보 피드백의 우선 순위가 크로스-스케줄링(cross-scheduling) 컴포넌트 캐리어에 대한 채널 상태 정보 피드백의 우선순위보다 높게 설정되는 것을 특징으로 하는 방법.
- 제 4항에 있어서, 상기 우선 순위 정보는,크로스-스케줄링(cross-scheduling) 컴포넌트 캐리어에 대한 채널 상태 정보 피드백의 우선 순위가 자기-스케줄링(self-scheduling)컴포넌트 캐리어에 대한 채널 상태 정보 피드백의 우선순위보다 높게 설정되는 것을 특징으로 하는 방법.
- 제 2항에 있어서,상기 채널 상태 정보 피드백 구성 정보는 상기 채널 상태 정보 피드백 구성 정보에 해당하는 하향링크 컴포넌트 캐리어를 지시하는 인덱스 정보를 포함하는 것을 특징으로 하는 방법.
- 반송파 집성(carrier aggregation) 시스템에서, 채널 상태 정보(Channel State Information: CSI)를 피드백하기 위한 단말에 있어서,외부와 무선신호를 송수신하기 위한 무선통신부; 및상기 무선통신부와 연결되는 제어부를 포함하되, 상기 제어부는,복수의 하향링크 컴포넌트 캐리어 각각에 대한 채널 상태 정보 피드백 구성(CSI feedback configuration) 정보를 기지국으로부터 수신하도록 상기 무선통신부를 제어하며, 상기 수신된 채널 상태 정보 피드백 구성 정보에 기초하여, 상향링크 프라이머리 컴포넌트 캐리어의 물리 상향링크 제어 채널(Physical Uplink Control Channel: PUCCH)을 통해 채널 상태 정보를 상기 기지국으로 피드백하도록 상기 무선통신부를 제어하며,상기 채널 상태 정보 피드백 구성 정보는 상기 복수의 하향링크 컴포넌트 캐리어 중 어느 하나의 컴포넌트 캐리어를 통해 수신되거나 상기 복수의 하향링크 컴포넌트 캐리어 각각을 통해 수신되는 것을 특징으로 하는 단말.
- 제 15항에 있어서,상기 어느 하나의 컴포넌트 캐리어는 프라이머리 컴포넌트 캐리어(Primary Component Carrier)인 것을 특징으로 하는 단말.
- 제 15항에 있어서,상기 채널 상태 정보는 CQI(channel quality indicator), PMI(precoding matrix indicator) 또는 RI(rank indicator)인 것을 특징으로 하는 단말.
- 제 17항에 있어서, 상기 제어부는,상기 채널 상태 정보 또는 하향링크 컴포넌트 캐리어에 따라 채널 상태 정보 피드백 우선 순위가 설정된 우선 순위 정보를 상기 기지국으로부터 수신하도록 상기 무선통신부를 제어하는 것을 특징으로 하는 단말.
- 제 18항에 있어서, 상기 제어부는,상기 복수의 하향링크 컴포넌트 캐리어 각각에 대한 채널 상태 정보를 동시에 상기 기지국으로 피드백 해야 하는 경우, 상기 수신된 우선 순위 정보에 기초하여 상기 기지국으로 피드백하기 위한 하나의 채널 상태 정보를 결정하도록 제어하는 것을 특징으로 하는 단말.
- 제 19항에 있어서, 상기 제어부는,상기 우선 순위가 설정된 하향링크 컴포넌트 캐리어에 대한 채널 상태 정보를 제외한 나머지 하향링크 컴포넌트 캐리어들의 채널 상태 정보를 드롭(drop)함으로써, 상기 하나의 채널 상태 정보를 결정하도록 제어하는 것을 특징으로 하는 단말.
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US15/015,974 US9853792B2 (en) | 2010-07-21 | 2016-02-04 | Method and apparatus for transmitting and receiving feedback on channel state information |
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- 2011-05-06 KR KR1020137003756A patent/KR101507865B1/ko active IP Right Grant
- 2011-05-06 WO PCT/KR2011/003408 patent/WO2012011657A2/ko active Application Filing
- 2011-05-06 US US13/811,553 patent/US8891477B2/en active Active
- 2011-05-06 CN CN201180044274.5A patent/CN103098400B/zh active Active
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2014
- 2014-10-22 US US14/521,207 patent/US9276725B2/en active Active
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2016
- 2016-02-04 US US15/015,974 patent/US9853792B2/en active Active
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CN104205922A (zh) * | 2012-03-30 | 2014-12-10 | 夏普株式会社 | 用于选择信道状态信息报告的装置 |
WO2013172674A1 (ko) * | 2012-05-17 | 2013-11-21 | 엘지전자 주식회사 | 채널 상태 정보 보고 방법 및 장치 |
US9692573B2 (en) | 2012-05-17 | 2017-06-27 | Lg Electronics Inc. | Method and device for reporting channel state information |
US10361827B2 (en) | 2012-06-18 | 2019-07-23 | Samsung Electronics Co., Ltd. | Aperiodic and periodic CSI feedback modes for coordinated multi-point transmission |
US11121834B2 (en) | 2012-06-18 | 2021-09-14 | Samsung Electronics Co., Ltd. | Aperiodic and periodic CSI feedback modes for coordinated multi-point transmission |
CN104734753A (zh) * | 2012-06-18 | 2015-06-24 | 三星电子株式会社 | 发送和接收信道状态信息的方法、用户设备和基站 |
US10965412B2 (en) | 2012-06-18 | 2021-03-30 | Samsung Electronics Co., Ltd. | Aperiodic and periodic CSI feedback modes for coordinated multi-point transmission |
RU2634695C2 (ru) * | 2012-07-06 | 2017-11-03 | Самсунг Электроникс Ко., Лтд. | Способ и устройство для предоставления отчета обратной связи по информации состояния канала |
KR101610731B1 (ko) | 2012-07-06 | 2016-04-08 | 삼성전자주식회사 | 채널 상태 정보 피드백 리포팅을 위한 방법 및 장치 |
WO2014007599A1 (en) * | 2012-07-06 | 2014-01-09 | Samsung Electronics Co., Ltd. | Method and apparatus for channel state information feedback reporting |
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WO2014010989A1 (ko) * | 2012-07-12 | 2014-01-16 | 엘지전자 주식회사 | 무선 통신 시스템에서 채널 상태 정보를 피드백하는 방법 및 이를 위한 장치 |
DE112013001872B4 (de) | 2012-08-28 | 2021-08-12 | Lg Electronics Inc. | Verfahren und Vorrichtung zur CSI-Rückmeldung in einem drahtlosen Kommunikationssystem |
US9698951B2 (en) | 2013-01-14 | 2017-07-04 | Lg Electronics Inc. | Method and apparatus for transmitting/receiving channel state information in wireless communication system |
WO2014109613A1 (ko) * | 2013-01-14 | 2014-07-17 | 엘지전자 주식회사 | 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 장치 |
WO2014157898A1 (ko) * | 2013-03-26 | 2014-10-02 | 삼성전자 주식회사 | 이동통신 시스템에서 무선랜을 이용해서 트래픽을 오프 로드하는 방법 및 장치 |
US10979953B2 (en) | 2013-03-26 | 2021-04-13 | Samsung Electronics Co., Ltd. | Method for offloading traffic by means of wireless LAN in mobile communications system and apparatus therefor |
US11678244B2 (en) | 2013-03-26 | 2023-06-13 | Samsung Electronics Co., Ltd. | Method for offloading traffic by means of wireless LAN in mobile communications system and apparatus therefor |
US9882616B2 (en) | 2013-08-07 | 2018-01-30 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting and receiving feedback information in mobile communication system based on 2 dimensional massive MIMO |
WO2015020464A1 (en) * | 2013-08-07 | 2015-02-12 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting and receiving feedback information in mobile communication system based on 2 dimensional massive mimo |
CN106063316B (zh) * | 2014-03-10 | 2020-02-11 | Lg电子株式会社 | 在无线通信系统中配置信道状态信息的参考资源的方法及其设备 |
CN106063316A (zh) * | 2014-03-10 | 2016-10-26 | Lg电子株式会社 | 在无线通信系统中配置信道状态信息的参考资源的方法及其设备 |
WO2020215341A1 (en) * | 2019-04-26 | 2020-10-29 | Nec Corporation | Method, device and computer readable medium for channel state information transmission |
Also Published As
Publication number | Publication date |
---|---|
US20130121299A1 (en) | 2013-05-16 |
CN103098400B (zh) | 2015-08-19 |
EP2597798A2 (en) | 2013-05-29 |
US8891477B2 (en) | 2014-11-18 |
KR101507865B1 (ko) | 2015-04-07 |
US20160156447A1 (en) | 2016-06-02 |
EP2597798A4 (en) | 2014-02-26 |
US9853792B2 (en) | 2017-12-26 |
US9276725B2 (en) | 2016-03-01 |
CN103098400A (zh) | 2013-05-08 |
US20150043500A1 (en) | 2015-02-12 |
KR20130064778A (ko) | 2013-06-18 |
WO2012011657A3 (ko) | 2012-03-15 |
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