WO2012108645A2 - Procédé et appareil de transmission et de réception d'informations d'état de canal dans un système de communication sans fil - Google Patents

Procédé et appareil de transmission et de réception d'informations d'état de canal dans un système de communication sans fil Download PDF

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Publication number
WO2012108645A2
WO2012108645A2 PCT/KR2012/000839 KR2012000839W WO2012108645A2 WO 2012108645 A2 WO2012108645 A2 WO 2012108645A2 KR 2012000839 W KR2012000839 W KR 2012000839W WO 2012108645 A2 WO2012108645 A2 WO 2012108645A2
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Prior art keywords
channel state
mode
state information
information
field
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PCT/KR2012/000839
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English (en)
Korean (ko)
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WO2012108645A3 (fr
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홍성권
박경민
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(주)팬택
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Priority claimed from KR1020110011272A external-priority patent/KR20120090705A/ko
Priority claimed from KR1020110012816A external-priority patent/KR20120092897A/ko
Application filed by (주)팬택 filed Critical (주)팬택
Publication of WO2012108645A2 publication Critical patent/WO2012108645A2/fr
Publication of WO2012108645A3 publication Critical patent/WO2012108645A3/fr

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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
    • 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
    • H04L1/0028—Formatting
    • H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
    • 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
    • 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

Definitions

  • the present invention relates to a method and apparatus for measuring and transmitting a channel state of a component carrier in a wireless communication system using one or more component carriers (CC).
  • CC component carriers
  • LTE Long Term Evolution
  • LTE-A Long Term Advanced
  • the base station and the user terminal to monitor the state of the network or the downlink in communication, which allows to adaptively transmit and receive data in the ever-changing network or downlink situation.
  • the number of carriers to be monitored also increases and decreases according to the number of carriers, so it is necessary to monitor the network or downlink state more effectively. To this end, it is necessary to put less processing resources in checking the network or downlink status.
  • the present invention relates to a wireless communication system, and to provide a method and apparatus for transmitting and receiving wireless communication channel state information.
  • it is intended to be able to more efficiently set a reporting method in a multi-carrier environment that can report a variety of channel state information.
  • it is intended to solve the ambiguity that may occur in a multi-carrier environment.
  • a first field of a payload may include report request indication information indicating an aperiodic report of channel state information of a user terminal.
  • Setting mode indication information in a second field implicitly indicating a reporting method of the channel state information, and transmitting a signal encoding the payload including the first field and the second field to the user terminal.
  • the indication information indicates a single mode or a multiple mode, and the report request indication information and the user Characterized by the mode delimiter calculated in at least one of the carrier aggregation configuration, transmission scheme, and adaptive modulation scheme of the terminal.
  • a first field of a payload included in a signal received from a base station is set to report request indication information indicating aperiodic channel state information report.
  • mode indication information includes at least one of the report request indication information and a carrier aggregation configuration, a transmission method, and an adaptive modulation method of the user terminal. Characteristic distinguishable by the mode delimiter calculated from one or more.
  • the apparatus for receiving channel state information sets report request indication information indicating aperiodic channel state information reporting of a user terminal as a first field of a payload, and the channel.
  • a transceiver for receiving a signal including channel state information, and a channel state information extractor for decoding the received signal according to a reporting method indicated by the mode indication information and extracting the channel state information. Indicates a single mode or a multiple mode, and the report request indication information and the user Characterized by the mode delimiter calculated in at least one or more of the carrier aggregation configuration, transmission scheme and adaptive modulation scheme of the terminal.
  • an apparatus for transmitting channel state information includes a transceiver for transmitting and receiving a signal encoded with a payload and a first payload of the payload included in a signal received by the transceiver. If the field is set to report request indication information indicating the aperiodic channel state information report, the control unit for measuring the channel state information for one or more component carriers indicated by the report request indication information, the measured information to the payload of the payload And a channel state information generator for generating a signal by encoding in a single mode or a multi-mode according to the mode indication information included in field 2, wherein the mode indication information includes the report request indication information and the carrier aggregation configuration and transmission of the user terminal. And a mode delimiter calculated from at least one of the Characterized by possible stars.
  • FIG. 1 illustrates a wireless communication system to which embodiments of the present specification are applied.
  • FIG. 2 is a diagram illustrating carrier aggregation and intercarrier scheduling to which the present invention is applied.
  • FIG. 3 is a view showing a linkage relationship between up and down carriers in a carrier aggregation boundary according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an ambiguity situation that can be applied to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a case in which a value of N to which an embodiment of the present invention is applied is based on a configured CC.
  • FIG. 6 is a diagram illustrating a case in which a value of N to which another embodiment of the present invention is applied is based on a configured CC.
  • FIG. 7 illustrates a case in which a value of N to which another embodiment of the present invention is applied is based on an activated CC.
  • FIG. 8 illustrates a case in which a value of N to which another embodiment of the present invention is applied is based on an activated CC.
  • FIG. 9 is a diagram illustrating a process of determining a reporting mode in order to request aperiodic channel state information from a base station according to an embodiment of the present invention and requesting reporting of the aperiodic channel state information to the user terminal accordingly. to be.
  • a user terminal receives a request for reporting of the aperiodic channel state information from the base station, confirms the reporting method in the payload including the report request and accordingly aperiodic channel state information Is a diagram illustrating a process of transmitting a message.
  • FIG. 11 is a diagram illustrating a configuration of a base station according to an embodiment of the present invention.
  • FIG. 12 is a diagram illustrating a configuration of a user terminal according to an embodiment of the present invention.
  • FIG. 13 is a diagram for one example of setting and transmitting a CSI of a CC identified by a UE as deactivation according to an embodiment of the present invention to a value of a preset scheme.
  • FIG. 14 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to an embodiment of the present invention.
  • FIG. 15 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to another embodiment of the present invention.
  • FIG. 16 is a diagram illustrating an example of setting a CSI of a CC identified by deactivation according to another embodiment of the present invention to a value of a preset method, but masking and transmitting a bitmap indicating whether the CC is activated in a CRC.
  • FIG. 16 is a diagram illustrating an example of setting a CSI of a CC identified by deactivation according to another embodiment of the present invention to a value of a preset method, but masking and transmitting a bitmap indicating whether the CC is activated in a CRC.
  • 17 is a diagram illustrating a process of generating and transmitting channel state information by a UE according to an embodiment of the present invention.
  • FIG. 18 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to another embodiment of the present invention.
  • FIG. 19 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to another embodiment of the present invention.
  • FIG. 20 is a diagram illustrating a process of generating channel state information and transmitting the channel state information to a base station so that the user terminal according to an embodiment of the present specification does not have ambiguity.
  • 21 is a diagram illustrating a process of receiving channel state information from a user terminal by the base station according to an embodiment of the present disclosure to check channel state information and confirming ambiguity of activation / deactivation of the user terminal and the CC.
  • FIG. 1 illustrates a wireless communication system to which embodiments of the present specification are applied.
  • Wireless communication systems are widely deployed to provide various communication services such as voice and packet data.
  • a wireless communication system includes a user equipment (UE) 10 and a base station 20 (base station, BS, or eNB).
  • Terminal 10 in the present specification is a generic concept that means a user terminal in wireless communication, WCDMA, UE (User Equipment) in LTE, HSPA, etc., as well as MS (Mobile Station), UT (User Terminal) in GSM ), SS (Subscriber Station), wireless device (wireless device), etc. should be interpreted as including the concept.
  • the base station 20 generally refers to a node communicating with the terminal 10, and includes a node-B, an evolved node-B, an base transceiver system (BTS), and an access point. ) May be called in other terms, such as a relay node.
  • BTS base transceiver system
  • the base station 20 or the cell should be interpreted in a comprehensive sense indicating some areas covered by the base station controller (BSC) in the CDMA, the NodeB of the WCDMA, and the like. It is meant to cover various coverage areas such as microcell, picocell, femtocell and relay node communication range.
  • BSC base station controller
  • the terminal 10 and the base station 20 are two transmitting and receiving entities used to implement the technology or technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to. .
  • the terminal 10 and the base station 20 are two (uplink or downlink) transmission and reception subjects used to implement the technology or the technical idea described in the present invention, which are used in a generic sense and are specifically referred to in terms or words. It is not limited by.
  • the uplink (Uplink or uplink) means a method for transmitting and receiving data to the base station 20 by the terminal 10
  • the downlink (downlink, or downlink) is a terminal (by the base station 20) 10) means a method of transmitting and receiving data.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • Uplink transmission and downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or a frequency division duplex (FDD) scheme that is transmitted using different frequencies. This can be used.
  • TDD time division duplex
  • FDD frequency division duplex
  • One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
  • the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
  • uplink and downlink may be configured based on one carrier or a pair of carriers.
  • Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH).
  • a data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.
  • multiple access schemes for downlink and uplink transmission may be different.
  • the downlink uses Orthogonal Frequency Division Multiple Access (OFDMA)
  • the uplink is equivalent to the use of Single Carrier-Frequency Division Multiple Access (SC-FDMA).
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • the layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which is widely known in communication systems. ), The second layer L2, and the third layer L3.
  • OSI Open System Interconnection
  • the physical layer belonging to the first layer provides an information transfer service using a physical channel.
  • LTE-A is based on the standard of a single carrier in LTE, and is discussing the combination of several bands.
  • Carrier Aggregation (“CA") in LTE-A is basically made based on the LTE standard, considering maximum backward compatibility, and up to 5 carriers in uplink and downlink
  • CA Carrier Aggregation
  • the important point in this carrier aggregation is how to configure the control channel extension and the data channel as the number of carriers increases.
  • CA refers to an environment in which a base station and a terminal transmit and receive signals using at least one CC.
  • These multiple component carriers may exist adjacent to each other or may exist in a frequency band spaced apart from each other.
  • the downlink component carrier and the uplink component carrier exist independently, the number may or may not be the same.
  • 3GPP LTE-A means a method of increasing communication quality and capacity by combining or configuring a plurality of bands.
  • TDD follows a scheme of extending an existing single band or carrier allocated to the entire uplink and downlink.
  • a standard for a single carrier supported by the existing LTE standard may be utilized to the maximum. Therefore, in the existing LTE Rel.8 standard, the standard is defined for the case having various bandwidths. And, in the carrier aggregation, the design for the individual carrier is the existing Rel. It can be implemented to apply the maximum of 8 standards.
  • the maximum carriers assignable to a specific UE in carrier aggregation may be different for each UE, and the maximum carrier set may also be defined differently for each UE. This maximum possible carrier set may be defined as a configuration component carrier set.
  • the 8 standard extends to a number of component carriers. That is, the existing standard consisting of a single component carrier is extended to a plurality of component carriers, cross-carrier scheduling that performs scheduling from one component carrier to another component carrier is possible.
  • control information may be included in the PDCCH to implement intercarrier scheduling.
  • a carrier indicator field (CIF)
  • CIF carrier indicator field
  • a 3-bit CIF can be allocated, and up to five component carriers can be indicated. That is, only five values among the possible values of 0 to 7 are allocated to the component carriers, and the remaining three values are not used (reserved).
  • the number of component carriers can be extended according to the system implementation.
  • PCC primary component carrier
  • SCC secondary component carrier
  • PCC means a component carrier that plays a major role in the transmission of control information and data in the communication between the eNB and the UE, the PCC may be configured to be UE-specific.
  • Component carriers other than PCC are defined as SCC.
  • Major measurement signals or control information can be transmitted and received through the PCC, and SCC can be allocated through the PCC. That is, the downlink PCC may allocate both a DL grant and an UL grant for another SCC although it is a single component carrier by intercarrier scheduling.
  • the uplink PCC can appropriately allocate the PUCCH to the uplink explicitly or implicitly, thereby allocating resources for a plurality of CCs.
  • explicit resource allocation means a case of explicitly indicating resource allocation through higher layer signaling
  • implicit resource allocation indicates a resource allocation through an appropriate rule including a position in a control region of a PDCCH. Means.
  • FIG. 2 is a diagram illustrating carrier aggregation and intercarrier scheduling to which the present invention is applied.
  • the downlink component carrier includes a PDCCH for providing control information and a PDSCH for providing data information.
  • PDCCH resources of a PDSCH and a PUSCH may be allocated.
  • the PDCCH 211 provides grant (allocation) information for the PDSCH 216 in the same component carrier
  • the PDCCH 215 is a grant for the PUSCH 261 of the uplink component carrier 260 linked to the same component carrier.
  • Provide (assignment) information The PDCCH 212 and the PDCCH 213 are grant (assignment) information for the PDSCH 216 of the DL SCC1 220, which is a subcomponent carrier, and a grant for the PDSCH 226 of the DL SCC2 230, a subcomponent carrier, respectively. (Assignment) information is provided.
  • the PDCCH 214 provides grant (allocation) information for the PUSCH 271 of the UL SCC1 270 which is a subcomponent carrier.
  • control information (e.g., transmission mode) for communication between the eNB and the UE is transmitted semi-statically to the UE by higher layer signaling.
  • a control channel for transmitting dynamic resource allocation information and control information required for transmission is required, which is a PDCCH.
  • the PDCCH is located at a certain portion of the control region in the subframe and is decoded through blind decoding at the UE entry.
  • the PDCCH is divided into various DCI formats, and the PDCCH provides common control information or UE specific control information.
  • the eNB may provide the UE with information for PDSCH or PUSCH decoding necessary for the UE and also provide the UE with control information necessary for communication.
  • component carriers may be activated or deactivated.
  • the carrier set that can be used by a specific UE on a maximum or preset criterion may be set as a configuration carrier set.
  • a specific component carrier is activated or deactivated to efficiently use radio resources.
  • an embodiment of the present invention will be described as an example in which component carriers in a component carrier set are activated or deactivated.
  • the present invention is not limited thereto, and an activation or deactivation mechanism is performed in all component carriers. Can also be used.
  • Activation / deactivation of the component carrier may be based on a downlink component carrier (DL CC). That is, when the uplink carrier is linked to the downlink component carrier (SIB2-linked), it can follow the active or inactive state of the linkage downlink carrier. Meanwhile, the downlink channel state is represented by Channel State Information (CSI) by Channel Quality Indicator (CQI) and Precoding Matrix Indicator (PMI) or RI (Rank Indicator), and the UE transmits information on the uplink through eNB. You can see the channel status.
  • CSI Channel State Information
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • Scheduling is not performed on the downlink downlink carrier and CSI is not measured by the UE.
  • PDSCH allocation for the activated downlink carrier is performed and CSI measurement is also made by the UE and reported to the eNB.
  • the active / deactivated scheme is applied for reducing complexity / power requirements of the UE.
  • FIG. 3 is a view showing a linkage relationship of up and down carriers in a carrier aggregation environment according to an embodiment of the present invention.
  • DL PCC 310 which is a downlink primary component carrier
  • UL PCC 360 which is an uplink primary component carrier
  • downlink subcomponent carrier DL SCC1 320 is associated with an uplink subcomponent carrier UL SCC1 370. It's a linkage relationship.
  • the downlink subcomponent carrier DL SCC2 330 is in a state where there is no linkage uplink component carrier.
  • the activation / deactivation of component carriers is determined by the eNB and controlled by the UE by MAC signaling. If an error occurs in MAC signaling, ambiguity may exist between the eNB and the UE during the corresponding signaling or configuration period.
  • a timer is set for an activated component carrier and a PDCCH is deactivated if the PDCCH is not received until the timer expires.
  • the eNB sends the PDCCH but the UE fails to properly decode the component. Even when the carrier is recognized as inactive, ambiguity may occur. That is, a situation in which ambiguity occurs is a situation where the states of the component carriers that the eNB recognizes as activated / deactivated do not match the states of the component carriers that the UE recognizes as activated / deactivated.
  • FIG. 4 is a diagram illustrating an ambiguity situation that can be applied to an embodiment of the present invention.
  • CC0 and CC2 are deactivated and CC1, CC3 and CC4 are activated as shown in 410.
  • CC2, CC4 is inactive
  • CC0, CC1, CC3 is the activation state of the component carrier recognized by the UE, as shown in 420. That is, it can be seen that the situation recognized by the eNB and the situation recognized by the UE in CC0 and CC4 are different, which can be said to be a state of ambiguity.
  • the ambiguity generated in FIG. 4 may cause problems in CSI transmission. That is, the size of the CSI information transmitted in the uplink is determined according to a mode determined by higher signaling for each component carrier and when combined CSI information of each activated component carrier is transmitted, the combined CSI of the activated component carriers is activated / It may change depending on the deactivation state. Meanwhile, channel state information is information required for an activated (or used) component carrier. Therefore, when ambiguity occurs between the base station and the user terminal about which component carrier is activated or deactivated, the size of the CSI for the entire component carrier may change. That is, in a situation where ambiguity occurs, the information length of the CSI may cause a problem.
  • the size of the CSI recognized by the eNB (known by the eNB) and the size of the CSI recognized by the UE may be different.
  • the payload of the CSI transmitted in the uplink may be recognized by the eNB at all differently even if there is no error generated by the uplink. For example, if the eNB recognizes that CC0, CC1, and CC3 are activated, and the UE recognizes that only CC1 and CC3 are activated, the eNB expects CSI information for three CCs to be transmitted. The information is decoded using the length (the length in which the CSI information for the three component carriers is stored), but since the UE transmits the CSI information for the two component carriers and the corresponding length, the mismatch and decoding between both information An error may occur.
  • the payload size of the CSI may be determined by the number of configured carriers and the reporting mode, rather than by the number of activated component carriers and the reporting mode. That is, the payload is not changed by activation / deactivation and the payload is adjusted according to the number of component carriers determined by higher signaling and semi-statically determined and the reporting mode is configured. You can consider how you decide.
  • ai) CSI is transmitted for all configured component carriers, or a-ii) a specific bit value (e.g., a dummy bit equal to 0) in a CSI corresponding to an inactive component carrier. bit)) or a-iii) a method of adding a field indicating activation / deactivation of the component carrier configured in a region other than the CSI payload may be applied.
  • a specific bit value e.g., a dummy bit equal to 0
  • a method of adding a field indicating activation / deactivation of the component carrier configured in a region other than the CSI payload may be applied.
  • a-i may be implemented by including a dummy bit or a recently confirmed CSI value of the deactivated component carrier among the configured component carriers, which will be described with reference to FIG. 13. .
  • the payload size may be considered to be achieved only by the activated component carrier, which will be described in the description of FIGS. 14 to 21.
  • the ambiguity of FIG. 4 discussed above considers two cases. In one case, the eNB recognizes the specific component carrier as active, whereas the UE recognizes the component carrier as inactive. In another case, the eNB recognizes the specific CC as deactivation, whereas the UE recognizes the CC as active.
  • the scheme a-ii) is not a problem in a situation where the eNB recognizes the deactivation and the activation as the UE.
  • Deactivation reported by the UE (based on eNB, the UE recognizes the activation as a specific component carrier and includes the measured value in the payload) .
  • the CSIs for the component carrier can be ignored, but in the opposite case the eNB is activated and the UE is In a situation where there is a component carrier recognized as deactivation, when the eNB recognizes and uses dummy CSI values as normal CSI values, error values are used to cause downlink performance.
  • the UE transmits to the eNB by combining the information on the inactive / active with the information of the CSI so that the eNB can infer the information on the inactive / active of the CC, the eNB receives this information
  • a method and apparatus for inferring whether a carrier is active or inactive are provided.
  • channel state information will be described as CSI, but the present invention is not limited thereto.
  • Aperiodic CSI reporting payload may be determined according to a reporting mode of a configured component carrier and the number of configured component carriers. For example, it can be defined as follows.
  • a value that can be set to 2 bits may be as follows. Same as
  • This RRC is applicable to a combination of five component carriers.
  • “10” or “11” above may be a subset of all component carriers configured by RRC signaling and for a subset of configured component carriers defined by “10” or “11”. Applicable In this case, the size of the payload is determined based on a subset of the configured component carriers that are predetermined by RRC and triggered by the PDCCH, not the entire set of configured component carriers.
  • the downlink component carrier determined by the SIB-2 linkage relationship is regarded as one of a subset of the component carriers configured even for one case, and thus, the embodiment of the present invention may be equally applied.
  • the SIB-2 linked downlink carrier is reported according to a given reporting mode, even if the number of component carriers is one (even if the number of configured component carriers is greater than one).
  • the SIB-2 linkage relationship means a linkage relationship that the eNB informs the UE by the SIB-2 field of the system information.
  • the eNB determined that the reporting of the CSI of the UE requires a CSI report aperiodically. This is set as a value for aperiodic CSI report request in a 2 bit or 1 bit field in advance among the areas constituting the DCI format (DCI format indicating uplink allocation) of the PDCCH, as described in Tables 1 and 2 above.
  • CSI report If "00" or “0” means that it is not a CSI report request, and if it is set to "01”, CSI information about DL CC determined by UL CC and SIB-2 linkage relationship for CSI reporting is provided. It means to ask.
  • "10" or "11” may request to provide CSI information on DL CCs of component carriers preset in RRC.
  • Pre-configured to RRC may include a set of component carriers requiring CSI information in information transmitted through an upper layer.
  • CCs delivered through these RRCs may be configured in an eNB in various ways.
  • the component carrier set configured to be available to the UE is ⁇ CC1, CC2, CC3, CC4 ⁇
  • two component carrier sets which are all or part of the configured component carrier set are used.
  • a component carrier set may be allocated to "10" and "11", respectively, as RRC.
  • the number of cases may vary, but in one embodiment, the CSI of ⁇ CC1, CC2 ⁇ in case of "10” and the CSI of ⁇ CC3, CC4 ⁇ in case of "11" may be measured and reported. .
  • the CSI of ⁇ CC1, CC3 ⁇ may be measured, and in case of "11", the CSI of ⁇ CC2, CC4 ⁇ may be measured and reported, and in another embodiment, "10".
  • the CSI of ⁇ CC1, CC2, CC3 ⁇ may be measured, and in case of "11”, the CSI of ⁇ CC2, CC3, CC4 ⁇ may be measured and reported.
  • "10" may instruct to report on all component carriers, and "11” may instruct to report on activated component carriers, including the case where the present invention may be modified and applied. .
  • the UE measures the CSI for the component carriers indicated by the eNB, or pre-arranged or activated with the eNB. Measuring the CSI, as described above, by measuring the CQI, PMI or RI and the UE transmits information about it in the uplink, the eNB can know the channel status.
  • UCI Uplink Control Information
  • CQI Uplink Control Information
  • PMI PMI
  • RI ACK / NAK information
  • the aperiodic CQI / PMI / RI report is scheduled when the bits indicating the aperiodic CSI are set in the uplink PDCCH by the eNB and multiplexed with the UL-SCH or transmitted only by the UCI without the UL-SCH. That is, a method of reporting CSI according to aperiodic CSI report request is divided into a single mode for transmitting only CSI information and a multiple mode for multiplexing CSI information and UL-SCH.
  • the exclusive mode is transmitted with only CSI information included in the PUSCH (UCI only on PUSCH, or without UL-SCH), and the multiple mode is transmitted with UL-SCH included (with UL-SCH).
  • the UE should receive an indication from the eNB which reporting mode to take. To make this indication, it can be indicated in an implicit manner. For example, in relation to the reporting method of the CQI, the reporting mode may be indicated based on the value of a specific field as shown in Equation 1.
  • the value indicating the Modulation and Coding Scheme (MCS) level (I MCS ) is 29, and the number of physical resource blocks ( PRBs ) is less than 4 PRBs . It can report aperiodic CQI in standalone mode. That is, when the eNB requests the report of the CQI and uplink allocation to satisfy Equation 1, the UE may measure the state of the channel according to the report request and report the measured value in the standalone mode.
  • MCS Modulation and Coding Scheme
  • Equation 1 it is applicable when the CQI request field is 1 bit.
  • the transmission of UCI information such as CSI basically uses QPSK modulation.
  • the CQI request field has been extended to 2 bits, and the DCI format for uplink allocation is composed of 0 (DCI format 0) and 4 ((DCI format 4, supporting SU-MIMO).
  • the schemes of Tables 3 and 4 may be applied to signal a single mode for transmitting only UCI information.
  • Table 3 shows the conditions for reporting in exclusive mode in DCI format 0 (considering QPSK transmission mode).
  • Table 4 lists the requirements for reporting in standalone mode in DCI format 4 (considering QPSK transmission mode). Table 4 indicates only the case of one transport block.
  • Tables 3 and 4 are applicable only when using QPSK and when there is only one transport block. Therefore, when a different modulation scheme is used, or when two transport blocks are used and two code blocks are required, a method of indicating a reporting mode is required.
  • N PRB is large in uplink allocation, transmission efficiency may be reduced. However, if N PRB is too small, it may not provide enough information. Therefore, while N PRBs in a range suitable for a single mode for transmitting only UCI are selected, it is necessary to allow the UE to recognize that the UE provides information on channel status in the single mode through the N PRB value.
  • the control information and data requirements of the user UE, the QoS of the UE, and the scheduling policy of the eNB are not predetermined values. It is determined by the eNB so as to fit the situation, and the UE checks this so that information about the channel state can be transmitted in a single mode or a multiple mode. Equation 2 can be applied when the value of a specific field is set to request aperiodic CSI ("01", "10", "11” as in the example of Table 1, or "1" as in the example of Table 2). .
  • Equation 2 may be applied to both a report on one DL CC and a report on multiple DL CCs, and may be applied to both the case of one or two transport blocks.
  • the specific field for requesting aperiodic CSI may vary depending on the implementation method, and may be a field for requesting aperiodic reporting such as CQI, RI, and PMI.
  • P is generally set to 29 in DCI formats 0 and 4, and is a value promised between the eNB and the UE, but may be promised as a value such as 30 and 31 in addition to 29.
  • X is a mode delimiter as a criterion for selecting N PRB of the most suitable size for reporting CSI information in standalone mode.
  • X can be calculated by applying the equation (3).
  • Equation 3 d is a constant constant, which is assumed to be 4 in one embodiment of the present invention. Also c is assumed to be 8 as a constant. The values of c and d may be set to a specific value, or may be set by the eNB according to a system situation and a system coefficient to deliver a value set through higher layer signaling (eg, RRC signaling).
  • RRC signaling eg, RRC signaling
  • N and S serve as a reference for selecting an appropriate N PRB.
  • N and S may have the following values.
  • N may be determined according to the number of component carriers, which may be the number of configured component carriers or the number of activated component carriers.
  • the CQI request field is 2 bits, the number of component carriers configured in " 10 " and “ 11 " Depending on having a value of "11").
  • the CQI request field is 2 bits, the number of component carriers that are activated among the component carriers configured by RRC signaling in "10" and "11” which are a subset of all component carriers (the 2-bit field of PDCCH is "10” or " Depends on having a value of 11 ").
  • S may be determined in relation to the transmission information.
  • the value of S may be determined according to the modulation order of the transport block. That is, in case of having one transport block, the value of S may be set to have a modulation order value of one transport block. In addition, in the case of having two transport blocks, the value of S may be set to the sum of modulation orders of each of the two transport blocks.
  • the modulation order means the number of bits modulated by one symbol
  • QPSK has 2
  • 16QAM is 4
  • 64QAM has 6 modulation orders.
  • S is calculated as follows.
  • CQI is provided as an embodiment for providing channel state information, but the present invention is not limited thereto.
  • the modulation order of each transport block may be the same.
  • FIG. 5 is a diagram illustrating a case in which a value of N to which an embodiment of the present invention is applied is based on a configured CC.
  • the configured total number of component carriers is five (CC0, CC1, CC2, CC3, CC4), such as 510.
  • DCI format 4 two transport blocks TB1 and TB2 are used as shown in 520.
  • Each modulation scheme is QPSK and 16QAM, and modulation orders Q1 and Q2 are 2 and 4, respectively.
  • Table 1 when the CQI request field is "10”, CC0, CC1, and CC2 are configured by RRC signaling and when "11", CC3 and CC4 are configured.
  • the eNB requests aperiodic CQI reporting, if the N PRB value is set to 4 when the CQI request field is set to "10" or 3 or less when the CQI request field is set to "11", the UE is determined from higher layer configuration information. Since N and S can be identified, the CQI report can be performed in a single mode by calculating the value of X through N and S.
  • FIG. 6 is a diagram illustrating a case in which a value of N to which another embodiment of the present invention is applied is based on a configured CC.
  • CC0, CC1, CC2, CC3, CC4 are configured in DCI format 0 to 620.
  • the modulation scheme is QPSK, and the modulation order is 2. This is the case when CC0, CC1, and CC2 are configured by RRC signaling when the CQI request field is "10", and CC3 and CC4 are configured when "11".
  • the c value may be changed when adjustment is needed, such as in the case of an extended CP.
  • FIG. 7 illustrates a case in which a value of N to which another embodiment of the present invention is applied is based on an activated component carrier.
  • two transport blocks are used in DCI format 4, and the modulation orders Q1 and Q2 are 2 and 4. This is the case when CC0, CC1, and CC2 are configured by RRC signaling when the CQI request field is "10", and CC3 and CC4 are configured when "11".
  • FIG. 8 illustrates a case in which a value of N to which another embodiment of the present invention is applied is based on an activated CC.
  • the configured total CCs are five (CC0, CC1, CC2, CC3, CC4) as shown in 810, among which CC0, CC2, and CC3 are activated.
  • the modulation scheme is QPSK with modulation order 2 and the CQI request field is "10”
  • CC0, CC1 and CC2 are configured by RRC signaling and "11". This is the case when CC3 and CC4 are configured.
  • the UE may refer to an activated component carrier recognized by the UE.
  • the value of N can be applied as a constant value.
  • X has a constant value regardless of the number of component carriers.
  • the UE may provide the eNB with the CSI reporting information on the activated component carrier and the information on the disabled component carrier, which the UE recognizes.
  • the CSI value of the deactivated component carrier may be transmitted as the most recently updated CSI value, or the deactivated / activated component carrier information may be masked and transmitted to the CRC.
  • FIG. 9 is a diagram illustrating a process of determining a reporting mode in order to request aperiodic channel state information from a base station according to an embodiment of the present invention and requesting reporting of the aperiodic channel state information to the user terminal accordingly. to be.
  • the base station determines that aperiodic channel state information of the user terminal is necessary (S910). If it is determined that the channel state of a specific component carrier is necessary, the component carrier is selected and a value of the first field of the payload is set to request reporting of channel state information of the component carrier (S920).
  • the mode delimiter is calculated from at least one of report request indication information and a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme of the user terminal (S930).
  • the mode identifier may be calculated from at least one of the report request indication information and the carrier aggregation configuration, transmission scheme, and adaptive modulation scheme of the user terminal. Calculating X in the related description.
  • X is information for allowing a user terminal to distinguish between a single mode and a multiple mode as described in Equations 2 and 3.
  • the reporting method of the channel state information is determined (S940), and according to the reporting method (S950), the mode indication information is generated and set in the second field so as to have a value within the range distinguished by the mode separator. That is, in the case of the single mode, as described above, the mode indication information smaller than or equal to the mode separator is set in the second field (S952), and in the second mode, the mode indication information larger than the mode separator is set in the second field ( S954).
  • a signal encoding the payload including the first and second fields is transmitted to the user terminal, and a signal including channel state information is received from the user terminal (S970).
  • the channel state information is extracted by decoding the received signal according to a reporting method indicated by the mode indication information (S980).
  • the first field may be a CSI request field
  • the second field may be information N PRB indicating a physical resource block.
  • the information I MCS indicating the MCS level is set to a predetermined value 29, 30, 31, and the second field is information N PRB indicating the physical resource block. If is less than or equal to the mode delimiter, it can be implemented by indicating a single mode.
  • the mode identifier may be calculated from at least one of the report request indication information and the carrier aggregation configuration, transmission scheme, and adaptive modulation scheme of the user terminal. Calculating X in the related description.
  • X is calculated by the user terminal confirming information such as a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme, and indicates the physical resource block using the information in the second field.
  • information such as a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme
  • the mode separator has been described in Equation 3 in proportion to the number of component carriers configured or activated in the user terminal and inversely proportional to the modulation order of the channel state information. That is, it may be calculated in N, which is a configured or activated component carrier, and S, which is a modulation order of a channel, where X, a mode separator, is proportional to N and inversely proportional to S. That is, as the number of CCs increases, the channel state information to be transmitted increases, so that the information N PRB indicating the physical resource block must also increase, thereby increasing the mode identifier. In addition, if the modulation order of the channel is increased or the transport block is increased, the result of encoding information to be transmitted is reduced, so that the mode identifier can be made smaller.
  • a user terminal receives a request for reporting of the aperiodic channel state information from the base station, confirms the reporting method in the payload including the report request and accordingly aperiodic channel state information Is a diagram illustrating a process of transmitting a message.
  • the user terminal receives a signal in which the payload is encoded from the base station (S1010). If the first field of the payload is set to report request indication information indicating aperiodic channel state information report, channel state information for one or more CCs indicated by the report request indication information is measured (S1020). The first field may be a CSI request field.
  • a mode separator is calculated based on at least one of report request indication information and a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme of the user terminal. The mode separator may be calculated each time, or the user terminal may have a value calculated in advance. The mode separator may be calculated from the number of component carriers or activated component carriers configured in FIGS.
  • the mode indication information of the second field of the payload is compared with the mode separator to determine whether the reporting method is the single mode or the multi mode (S1040).
  • the second field may be information N PRB indicating a physical resource block. If the reporting method is the single mode, that is, if the mode indication information is less than or equal to the mode separator, only the channel state information is included in the payload to be transmitted (S1052). If the reporting method is multi-mode, the multiplexing of other information and channel state information is included in the payload (S1054).
  • the single mode only the CSI information is included in the PUSCH (S1052).
  • the PUSCH and the CSI information including the UL-SCH are multiplexed. .
  • a signal is generated by encoding a PUSCH (S1060), and the generated signal is transmitted to a base station (S1070).
  • the information I MCS indicating the MCS level is set to a predetermined value 29, 30, 31, and the second field is information N PRB indicating the physical resource block. If is less than or equal to the mode delimiter, it can be implemented by indicating a single mode.
  • One example of reporting the channel state information may be CQI / PMI / RI reporting, which is configured by RRC signaling by an eNB, which is a base station, in a relationship between a downlink transmission mode and a possible CQI report type.
  • the CQI report type may be divided into a wideband feedback scheme and an eNB configuration subband feedback scheme.
  • a UE which is a user terminal, measures one wideband CQI value for the entire system band.
  • the UE measures one wideband CQI value for the entire system band and additionally measures and reports the CQI value for each subband.
  • the size k of each subband may be set as shown in Table 5, but this may be configured differently according to an implementation method.
  • the UE With the subband feedback chosen by the UE, the UE has M preferred subbands of size k. CQI values for can be measured and reported in incremental form.
  • the reporting mode can be selected by combining the CQI with the PMI. As shown in Table 6, the combined mode can be selected according to the CQI feedback type and the PMI feedback type, and the combined mode is used to determine the transmission mode.
  • the above process is an embodiment meaning various configuration information necessary for the UE to measure to report the CQI / PMI, the present invention is not necessarily limited thereto.
  • the UE may measure the channel state and collect the channel state information of the downlink component carrier in various ways and generate the information as CQI, PMI, RI, and the like.
  • FIG. 11 is a diagram illustrating a configuration of a base station according to an embodiment of the present invention.
  • the base station of FIG. 11 determines a reporting mode in order to request aperiodic channel state information from the user terminal, thereby requesting the user terminal to report aperiodic channel state information, and reports the aperiodic channel state information from the user terminal. Will receive.
  • the overall configuration is composed of the channel state information extraction unit 1110, the control unit 1120, and the transceiver unit 1130.
  • the controller 1120 determines that aperiodic channel state information of the user terminal is required. When the controller 1120 determines that it is necessary, the controller 1120 selects component carriers requiring channel state information and sets a value of a first field of the payload to request reporting of channel state information of the corresponding component carrier.
  • the controller 1120 calculates a mode separator in at least one of report request indication information and a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme of the user terminal.
  • the mode delimiter may be calculated from the report request indication information and the carrier aggregation configuration, transmission scheme, and adaptive modulation scheme of the user terminal. As an embodiment, X, 6, 7, 8, and related descriptions described above will be described. It includes the process of calculating.
  • X is information for allowing a user terminal to distinguish between a single mode and a multiple mode as described in Equations 2 and 3.
  • the controller 1120 determines the reporting method of the channel state information, generates and sets the mode indication information in the second field so as to have a value within a range distinguished by the mode separator according to the reporting method. That is, as described above, the controller 1120 sets mode indication information smaller or equal to the mode separator in the second field in the single mode, and sets mode indication information larger than the mode separator in the second field in the multiple mode. do.
  • the transceiver 1130 transmits a signal encoding the payload including the first and second fields to the user terminal, and receives a signal including channel state information from the user terminal.
  • the channel state information extractor 1110 extracts the channel state information by decoding the received signal according to a reporting method indicated by the mode indication information.
  • the first field may be a CSI request field
  • the second field may be information N PRB indicating a physical resource block.
  • the information I MCS indicating the MCS level is set to a predetermined value 29, 30, 31, and the second field is information N PRB indicating the physical resource block. If is less than or equal to the mode delimiter, it can be implemented by indicating a single mode.
  • the mode identifier may be calculated from at least one of the report request indication information and the carrier aggregation configuration, transmission scheme, and adaptive modulation scheme of the user terminal. Calculating X in the related description.
  • X is calculated by the user terminal confirming information such as a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme, and indicates the physical resource block using the information in the second field.
  • information such as a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme
  • the mode separator has been described in Equation 3 in proportion to the number of component carriers configured or activated in the user terminal and inversely proportional to the modulation order of the channel state information. That is, it may be calculated in N, which is a configured or activated component carrier, and S, which is a modulation order of a channel, where X, a mode separator, is proportional to N and inversely proportional to S. That is, as the number of CCs increases, the channel state information to be transmitted increases, so that the information N PRB indicating the physical resource block must also increase, thereby increasing the mode identifier. In addition, if the modulation order of the channel is increased or the transport block is increased, the result of encoding information to be transmitted is reduced, so that the mode identifier can be made smaller.
  • the user terminal is a diagram illustrating a configuration of a user terminal according to an embodiment of the present invention.
  • the user terminal is a diagram illustrating a process of receiving a request for reporting of aperiodic channel state information from a base station, checking a reporting method in a payload including a corresponding report request, and transmitting aperiodic channel state information to the base station accordingly.
  • the overall configuration includes a transceiver 1230, a controller 1220, and a channel state information generator 1210 for transmitting and receiving a signal encoded by a base station and a payload.
  • the controller 1220 receives a signal in which the user terminal received by the transceiver 1230 encodes the payload from the base station.
  • the first field of the payload is set to report request indication information indicating aperiodic channel state information report, channel state information for one or more CCs indicated by the report request indication information is measured.
  • the first field may be a CSI request field.
  • the mode identifier is calculated from at least one of report request indication information and a carrier aggregation configuration, a transmission scheme, and an adaptive modulation scheme of the user terminal.
  • the mode separator may be calculated each time, or the user terminal may have a value calculated in advance.
  • the mode separator may be calculated from the number of component carriers or activated component carriers configured in FIGS.
  • the channel state information generation unit 1210 compares the mode indication information of the second field of the payload with the mode delimiter, checks whether the reporting method is the single mode or the multi mode, and if the reporting method is the single mode, that is, the mode indication. If the information is less than or equal to the mode separator, only the channel state information is included in the payload to be transmitted. If the reporting method is multi-mode, the other information and the channel state information are multiplexed and included in the payload.
  • the second field may be information N PRB indicating a physical resource block. According to an embodiment of the present invention, as described above, in the single mode, only the CSI information is included in the PUSCH, and in the multi mode, the PUSCH and the CSI information including the UL-SCH are multiplexed.
  • the PUSCH is encoded to generate a signal, and the transceiver 1230 transmits the generated signal to the base station.
  • the information I MCS indicating the MCS level is set to a predetermined value 29, 30, 31, and the second field is information N PRB indicating the physical resource block. If is less than or equal to the mode delimiter, it can be implemented by indicating a single mode.
  • the present invention discloses and proposes a method for properly transmitting UCI information even in the case of a QAM and two or more transport blocks.
  • the UCI information shows an excessively better performance than the system requires and becomes an overhead.
  • PDCCH By configuring the X value according to the method proposed in the present invention, it is possible to reduce the overhead while having a performance appropriate to the system requirements.
  • another method for overcoming a mismatch of information between the eNB and the UE for deactivation or activation in ambiguity and transmitting information on the channel may implement the above-described a-i) and a-iii) methods. That is, a method of setting information in a predetermined manner to the CSI information of the deactivated component carrier or adding a field indicating activation / deactivation of the component carrier configured in a region other than the CSI payload may be applied.
  • the method may include identifying component carriers of a first group recognized as activation and component carriers of a second group recognized as inactive. Measuring channel state information on the CCs, and using the measured channel state information to distinguish the CCs of the first group from the CCs of the second group and the payload of the CCs. Generating combining information, and generating and transmitting a signal obtained by encoding the generated channel state information payload to a base station.
  • a method of receiving channel state information in a wireless communication system includes receiving a signal in which a payload including channel state information is encoded from the user terminal, and receiving a payload including channel state information from the signal. Decoding and extracting, identifying, by the payload, the component carrier of the first group that the user terminal recognizes as activated and the component carrier of the second group that recognizes the user terminal deactivated; If ambiguity occurs in comparison with whether the recognized component carrier is activated or deactivated, transmitting a command to resolve the ambiguity to the user terminal.
  • an apparatus for transmitting channel state information includes a transceiver for transmitting and receiving a radio signal, a channel state information generator for generating channel state information of a component carrier, and the transceiver and the channel state information. And a control unit for controlling the generation unit, wherein the control unit identifies the component carrier of the first group recognized as active and the component carrier of the second group recognized as inactive, and controls the transceiver to control the component carriers of the first group. Measure channel state information on the channel state information generator, and the channel state information payload or the pay so that the component carriers of the first group and the component carriers of the second group are distinguished using the measured channel state information. Generates information to be combined with the load, wherein the controller is configured to generate the channel state information payload Generating a coded signal and controlling the transceiver to transmit to the base station.
  • an apparatus for receiving channel state information includes a transceiver for transmitting and receiving a radio signal, a channel state information extractor for extracting channel state information of an element carrier included in the radio signal, and the transceiver And a controller configured to control the channel state information extractor, wherein the transceiver receives a signal in which a payload including channel state information is encoded from the user terminal, and the controller controls the channel state information extractor to control the channel state information extractor.
  • a payload including channel state information is decoded and extracted from the signal, and the first group of component carriers recognized as activated by the user terminal and the second group of components recognized as deactivated by the payload. Identifying the carrier, activation / ratio of the component carrier recognized by the base station When the ambiguity has occurred as compared to the torch or not, characterized by the user terminal to control the transmission and reception unit to transmit a command to correct the ambiguity.
  • FIG. 13 is a diagram for one example of setting and transmitting a CSI of a CC identified by a UE as deactivation according to an embodiment of the present invention to a value of a preset scheme.
  • 1310 of FIG. 13 is an active or deactivated state of a component carrier recognized by the UE.
  • the UE recognizes CC0, CC1, and CC3 as activated CCs, and recognizes CC2 and CC4 as disabled CCs.
  • the UE configures CSI for all component carriers to be transmitted to the eNB as 1320 according to the recognized state of the component carrier. That is, the UE includes the CSIs measured by the respective CCs for the component carriers CC0, CC1, and CC3 that are recognized as active, and sets values of the component carriers CC2 and CC4 that are recognized as inactive to a value of a preset scheme.
  • the most recently updated CSI value of the deactivated component carrier is set to a value of a preset scheme.
  • the eNB checks information on each component carrier received and indicates that the UE has been deactivated for the component carrier reported with the latest updated CSI value. I can see that it is aware.
  • a dummy bit which is a default value, may be transmitted as a CSI value, and the dummy bit received by the eNB may be recognized as information on an inactive CC.
  • the eNB checks information on each component carrier received. In this case, the eNB may recognize the CSI values (CSI values having the same value as the most recently updated CSI) of CC2 and CC4 as the CSI values reported by the UE.
  • FIGS. 14 and 15 are diagrams illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to an embodiment of the present invention.
  • CRC Cyclic Redundancy check
  • the UE masks the CRC bits by configuring the activation / deactivation of each configured component carrier of the downlink in a bitmap form.
  • the masking method includes an XOR (OR) of the CRC bit and the bitmap.
  • bitmap form consists of N bits, and each bit represents activation / deactivation of each configured component carrier. That is, in the case of five configured component carriers, if "11010", '1' of the first bit is activated on the first component carrier and '1' of the second bit is on the basis of the bit located in the leftmost bit. Activation, '0' of the third bit indicates deactivation of the third component carrier, '1' of the fourth bit indicates activation of the fourth component carrier, and '0' of the fifth bit indicates deactivation of the fifth component carrier.
  • n may be equal to CIF or may be a cell index.
  • the bit value '1' may indicate activation and the bit value '0' may indicate inactivation.
  • the mapping relationship between the bit value 1/0 and the activation / deactivation, and the mapping between the bit position and the component carrier may be variously set according to the implementation process of the present invention.
  • the component carriers are mapped in the order of the first bits, the first bits, the second bits, and the third bits, and the value indicating the activated component carrier is 0 and the value indicating the deactivated component carrier is 1, Likewise, when only the second, third, and N-1 component carriers are activated, it can be set as shown in Table 8 (N is the number of configured component carriers).
  • 14 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to an embodiment of the present invention.
  • 1410 denotes a payload of the first generated CSI value, and generates a CRC value.
  • the CRC is composed of 8 bits.
  • the UE generates a new CRC value from CRC0 to CRC4 as shown in 1430 by performing XOR masking on the active / inactive bitmap 1420 described above with respect to each of the generated CRC bits.
  • the first CC is the PCC, which is the major carrier
  • the second, 3, 4, and 5 CCs are SCCs.
  • the UE recognizes the first, second, and fourth component carriers CC0, CC1, and CC3, as shown in FIG. 13, and the third and fifth component carriers, CC 2 and CC4, are deactivated.
  • each bit of the bitmap is subjected to XOR operations with CRC0, CRC1, CRC2, CRC3, CRC4 of 1410, CRC0, CRC1, CRC2, CRC3, and CRC4 having new values are generated as shown in 1430.
  • the CRC5, CRC6, and CRC7 can be masked with 0 so that the value in the original CRC bit does not change.
  • the UE transmits the newly generated CRC value to the eNB, and the eNB may mask the CRC value in reverse to extract a bitmap such as 1420 to determine the state of the deactivated / activated component carrier recognized by the UE.
  • the bitmap is masked on a portion of the CRC, and '0' is masked on the remaining bitmap.
  • FIG. 15 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to another embodiment of the present invention.
  • FIG. 15 illustrates a case in which activation / deactivation state information of a PCC is removed from a bitmap, unlike in FIG. 14. This can be omitted in the active / inactive bitmap since the primary component carrier is always active.
  • the first component carrier is PCC
  • the component carriers of second, third, fourth, and fifth are SCCs.
  • CRC0, CRC1, CRC2, and CRC3 of 1510 are generated.
  • the CRC4, CRC5, CRC6, and CRC7 may be masked with 0 so that the value in the original CRC bit does not change.
  • the UE transmits the CRC value to the eNB, and the eNB may mask the CRC value in reverse to extract a bitmap such as 1520 to determine the state of the deactivated / activated component carrier recognized by the UE.
  • the bitmap is masked on a portion of the CRC, and '0' is masked on the remaining bitmap.
  • the XOR operation can be performed starting from the small index part or the large index part in the bit order of the CRC.
  • bitmap and CRC0, CRC1, CRC2, and CRC3 are masked.
  • this is an embodiment of the present invention. This may vary in various ways depending on what the eNB and UE have promised to do.
  • Parts 1420 and 1520 of FIGS. 14 and 15 that do not match the component carriers are masked with 0 so that the original CRC values are included in 1430 and 1530 as they are.
  • the CRC bits of FIGS. 14 and 15 are examples of error detection codes generated by combining the payloads, and other error detection codes may be combined according to an implementation process of the system.
  • FIG. 16 is a diagram illustrating an example of setting a CSI of a CC identified by deactivation according to another embodiment of the present invention to a value of a preset method, but masking and transmitting a bitmap indicating whether the CC is activated in a CRC.
  • FIG. 16 is a diagram illustrating an example of setting a CSI of a CC identified by deactivation according to another embodiment of the present invention to a value of a preset method, but masking and transmitting a bitmap indicating whether the CC is activated in a CRC.
  • the first, second and fourth component carriers CC0, CC1, and CC3 are activated, and the third and fifth component carriers CC2 and CC4 are inactive.
  • the most recently updated CSI values are set for the third and fifth component carriers CC2 and CC4 as shown in 1623 and 1624, and whether each component carrier is activated as shown in FIG. 14 or 15.
  • the channel state information generated by the UE becomes 1620, which is transmitted from the UE to the eNB through channel encoding, channel interleaving, and the like.
  • 17 is a diagram illustrating a process of generating and transmitting channel state information by a UE according to an embodiment of the present invention.
  • the UE reports (reports) channel state information to the eNB periodically or aperiodically. These are called periodic CSI reporting and aperiodic CSI reporting, respectively.
  • Periodic CSI reporting means providing CSI information at regular intervals.
  • the eNB requests the aperiodic CSI report from the UE with PDCCH signaling dynamically and aperiodically under arbitrary judgment and receives the aperiodic CSI report from the UE.
  • Aperiodic CSI reporting may be implemented in such a way that control information required by higher layer signaling such as RRC signaling is delivered and reported by it.
  • DCI format 0 (one of the uplink grant formats), which is one of the DCI formats (DCI format) of the PDCCH of the 8/9 standard, includes uplink control information (UCI) such as CQI / PMI / RI information indicating channel state information for a downlink carrier. If there is a triggering bit that requires aperiodic period and is set to 1, the UE transmits information based on this.
  • UCI uplink control information
  • DCI format 4 is used as uplink DCI format in addition to DCI format 0, and it provides MIMO transmission control information for uplink. Therefore, in DCI format 0 and DCI format 4, the existing triggering bit is additionally added for CQI triggering. Can be. Therefore, all DCI types of PDCCH for downlink data transmission may be defined as DL grants, and all DCI types of PDCCH for uplink data transmission may be referred to as UL grants.
  • the UE measures the channel state of the downlink component carrier according to the CSI reporting mode, and calculates CQI / PMI / RI information.
  • the downlink channel state (status) is represented by a channel quality indicator (CQI) and a precoding matrix indicator (PMI) or a rank indicator (RI), and the eNB transmits information on the uplink by the eNB. You can see the situation.
  • the UE calculates CQI / PMI / RI information and the like by measuring the channel state of the downlink component carrier according to the CSI reporting mode for each downlink component carrier. In the aperiodic reporting mode, CQI / PMI / RI reporting of the UE is performed as shown in Tables 5 and 6 described above.
  • Tables 5 and 6 illustrate one embodiment of various configuration information required for the UE to measure the CQI / PMI.
  • the UE which is a user terminal, measures a channel state in order to collect channel state information of a downlink component carrier and generates it as information such as CQI, PMI, RI, and the like (S1720).
  • the UE determines the coding scheme of the channel (S1730).
  • the channel coding scheme for the transmission of the aperiodic CSI through the uplink applies a Reed Muller Code (RM) when the payload size of the transmitted CSI is less than or equal to 11 bits, and a convolution code (convolution code) when it is larger than 11 bits.
  • RM Reed Muller Code
  • the convolution code can be applied.
  • an 8-bit CRC code is added for error detection. Therefore, when the length of the CSI information generated in S1720 is less than or equal to 11 bits, the RM may be applied. When the length of the CSI information is greater than 11 bits, the convolution code is applied, so that the coding scheme may be determined based on the length of the CSI information. .
  • the UE applies the RM in S1730, as shown in FIG. 13, the UE sets the most recently updated CSI value as the CSI value for the component carrier recognized as deactivated among the configured component carriers (S1742) and recognizes that it is activated. The CSI value for one component carrier is measured in S1710 and sets the CSI value generated in S1720 (S1744).
  • the UE when the UE applies the convolution code in S1730, it generates a CSI payload (S1752).
  • the CSI payload measures the CSI value for the component carrier recognized to be activated in S1710 and sets the CSI payload to the CSI value generated in S1720.
  • the CSI value for the component carrier recognized as deactivated may be set to a default value (dummy bit) or the most recently updated CSI value.
  • the CSI payload including only the CSI value for the component carrier recognized as activated may be generated.
  • a CRC value is generated for the CSI payload.
  • a bitmap indicating activation / deactivation of component carriers configured as described with reference to FIGS. 14, 15, and 16 is generated (S1756), and a new CRC is generated by masking the bitmap with the CRC (S1758). ).
  • the first method is a method in which CSI is independently encoded and multiplexed with UL-SCH (Uplink Shared Channel) and transmitted.
  • the second method is a method in which a CSI is transmitted to a PUSCH without a UL-SCH. Therefore, when the CSI transmission scheme is multiplexed with the UL-SCH as in S1760, the CSI value is multiplexed with the UL-SCH (S1762). On the other hand, if transmitted only in the CSI without the UL-SCH, the control information is mapped (S1764).
  • the signal generated in S1762 or S1764 performs channel interleaving (S1770), and transmits the signal generated through the LTE transmission process to the eNB (S1780).
  • the eNB may determine whether to activate / deactivate the component carriers transmitted by the UE in the received signal through a CSI value set for each component carrier or through a bitmap.
  • FIG. 18 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to another embodiment of the present invention.
  • FIG. 18 illustrates a case where activation / deactivation state information of a PCC is removed from a bitmap, unlike FIG. 15. This can be omitted in the active / inactive bitmap since the primary component carrier is always active.
  • the first component carrier is PCC
  • the component carriers of second, third, four, five, six, seven, eight, and nine are SCCs.
  • the UE recognizes that the first, second, third, and eighth component carriers CC0, CC1, CC2, and CC7 are active, and the fourth, fifth, sixth, seventh, and ninth component carriers CC 3, CC4, CC5, If CC6 and CC8) are deactivated, the method shown in Table 7 is applied, but when the activation / deactivation information of CC0 which is PCC is omitted, a bitmap such as 1820 may be generated. That is, a bitmap may be generated for one or more element carriers than the number of CRC bits.
  • CRC0, CRC1, CRC2, CRC3, CRC4, CRC5, CRC6, and CRC7 of 1810 by XOR operation CRC0, CRC1, CRC2, CRC3, CRC4, CRC5, CRC6, CRC7 are generated.
  • the UE transmits the CRC value to the eNB, and the eNB may mask the CRC value in reverse to extract a bitmap such as 1820 to determine the state of the deactivated / activated component carrier recognized by the UE.
  • FIG. 19 is a diagram illustrating an example in which a UE configures a deactivation / activation state of a configured component carrier as a bitmap and transmits it to an eNB according to another embodiment of the present invention.
  • FIG. 19 illustrates a case in which activation / deactivation state information of a PCC is removed from a bitmap as shown in FIG. 15. This can be omitted in the active / inactive bitmap since the primary component carrier is always active.
  • the first component carrier is PCC
  • the component carriers of second, third, fourth, and fifth are SCCs. As shown in FIG.
  • Table 7 when the UE recognizes the first, second, and fourth component carriers CC0, CC1, and CC3, and the third and fifth component carriers CC 2 and CC4 are inactive, Table 7 The following method is applied, but the activation / deactivation information of the PCC CC0 is omitted. In this case, a bitmap such as 1920 may be generated.
  • bitmap of 1920 may be equally applied to CRC4, CRC5, CRC6, and CRC7 (a bitmap having a value of '1010'), or a new bitmap generated by XORing a bitmap of 1920 with 1 (' A bitmap having a value of 0101 ') may be applied to CRC4, CRC5, CRC6, and CRC7.
  • CRC4 CRC5, CRC6, and CRC7.
  • a new bitmap (having a value of '0101') 1924 and CRC4, CRC5, CRC6, and CRC7 are masked to generate new CRC0, CRC1, CRC2, CRC3, CRC4, CRC5, CRC6, and CRC7 as in 1930. do.
  • the UE transmits the CRC value 1930 to the eNB, and the eNB may mask the CRC value in reverse to extract a bitmap such as 1820 to determine the state of the deactivated / activated component carrier recognized by the UE.
  • control information not the information related to the active and inactive. This may mask the corresponding control information at a location of a predetermined CRC bit according to the agreement between the UE and the eNB.
  • FIG. 20 is a diagram illustrating a process of generating channel state information and transmitting the channel state information to a base station so that the user terminal according to an embodiment of the present specification does not have ambiguity.
  • the user terminal receives a request for reporting of aperiodic channel state information from the base station (S2010).
  • the CC checks the CC of the first group as activated and the CC of the second group recognized as inactive.
  • the recognition of the activation / deactivation is a matter determined by the user terminal, which may be different from the matter indicated or determined by the base station.
  • the user terminal measures channel state information of the activated, that is, the component carriers of the first group.
  • the channel state information payload is generated to provide the measured channel state information to the base station.
  • the channel state information payload or information combined with the payload may be generated to distinguish the component carriers of the first group from the component carriers of the second group by using the measured channel state information (S2040). ).
  • the channel state information of the CCs of the second group may be set to a value of the most recently updated channel state information.
  • a value previously set as a default value or a value of a dummy bit may be set.
  • the component carrier of the first group and the component carrier of the second group are indicated.
  • the bitmap may be generated, and the generated bitmap may be masked with an error detection code for the payload to generate a new error detection code.
  • the method of using the channel state information payload or the error detection code for the payload may be implemented using both methods as shown in FIG. 16.
  • the user terminal generates a signal encoding the generated channel state information payload and transmits the generated signal to the base station (S2050).
  • the transmission scheme may be divided into a case of multiplexing with the UL-SCH and a case of transmitting alone without multiplexing.
  • a command for instructing activation or deactivation of a specific component carrier may be received from the base station to correct ambiguity of the activated or deactivated component carrier.
  • 21 is a diagram illustrating a process of receiving channel state information from a user terminal by the base station according to an embodiment of the present disclosure to check channel state information and confirming ambiguity of activation / deactivation of the user terminal and the CC.
  • the base station transmits a request for reporting aperiodic channel state information to the user terminal (S2110).
  • a payload including channel state information is encoded from the user terminal.
  • the payload including the channel state information is extracted from the received signal (S2130).
  • an error detection code may be used to extract the signal.
  • the base station identifies the component carrier of the first group that the user terminal is recognized as activated in the payload and the component carrier of the second group where the user terminal is deactivated (S2140). In this case, as shown in FIG. 13, the checking may include identifying a component carrier whose value of the channel state information of the payload is a value of the most recently updated channel state information as the component carrier of the second group.
  • channel state information of the CC when recently updated channel state information is received as channel state information of the CC, it may be recognized that the user terminal is inactivated with respect to the CC.
  • the user terminal even when a dummy bit serving as a default value is received, the user terminal may be recognized as being inactive for the corresponding CC.
  • an error detection code combined with the channel state information payload may be used. That is, extracting a bitmap masked to the error detection code for the payload, and extracting and confirming information indicating the component carrier of the first group and the component carrier of the second group from the extracted bitmap. It may include. Since the number of component carriers configured is limited, the bitmaps that can be generated from them are also limited. Therefore, the error detection code and the bitmap information of the original payload can be extracted by applying the bitmap to the error detection code in the reverse direction. In addition, information indicating the component carrier of the first group and the component carrier of the second group may be extracted from the extracted bitmap.
  • the method of using the channel state information payload or the error detection code for the payload can be confirmed using both methods as shown in FIG. 16.
  • the base station Since the base station has confirmed information on which component carrier is recognized as activated or deactivated by the user terminal, the base station checks whether the component carrier is activated or deactivated (S2150). When ambiguity occurs as a result of the comparison, the user terminal and the ambiguity are processed or resolved (S2160). In order to process the ambiguity, a command for inactivating or deactivating the selected component carrier is transmitted by deactivating the component carriers of the first group or selecting a component carrier to be activated from the component carriers of the second group. In addition, it can be implemented in various ways.
  • the above-described configuration of the user terminal of FIG. 12 may apply the embodiment of the present disclosure described with reference to FIGS. 13 to 21.
  • the user terminal of FIG. 12 generates a channel state information and transmits the channel state information to the base station so as to avoid ambiguity.
  • the overall configuration includes a channel state information generator 1210, a controller 1220, and a transceiver 1230.
  • the transceiver 1230 transmits and receives a radio signal, the channel state information generator 1210 generates channel state information of the CC, and the controller 1220 is the transceiver 1230 and the channel state information generator 1210. ).
  • the transceiver 1230 may receive a report request for aperiodic channel state information from the base station.
  • the controller 1210 identifies the component carrier of the first group recognized as active and the component carrier of the second group recognized as inactive, and controls the transceiver to control the component carriers of the first group. Measure channel state information.
  • the measured information is provided to the channel state information generator 1210, and the channel state information generator 1210 uses the measured channel state information to transmit the component carrier of the first group and the component of the second group.
  • a channel state information payload or information combined with the payload is generated to distinguish carriers.
  • the channel state information of the CCs of the second group may be set to a value of the most recently updated channel state information.
  • a value previously set as a default value or a value of a dummy bit may be set.
  • the component carrier of the first group and the component carrier of the second group are indicated.
  • the bitmap may be generated, and the generated bitmap may be masked with an error detection code for the payload to generate a new error detection code.
  • the method of using the channel state information payload or the error detection code for the payload may be implemented using both methods as shown in FIG. 16.
  • the controller 1220 generates a signal encoding the generated channel state information payload and controls the transceiver 1230 to transmit the signal to the base station.
  • the transmission scheme may be divided into a case of multiplexing with the UL-SCH and a case of transmitting alone without multiplexing.
  • a command for instructing activation or deactivation of a specific component carrier may be received from the base station in order to process ambiguity of the activated or deactivated component carrier.
  • the configuration of the base station of FIG. 11 described above may apply the embodiment of the present disclosure described with reference to FIGS. 13 to 21.
  • the base station receives the channel state information from the user terminal to confirm the channel state information, and shows the configuration to confirm the ambiguity of the active / inactive of the user terminal and the CC.
  • the overall configuration is composed of the channel state information extraction unit 1110, the control unit 1120, and the transceiver unit 1130.
  • the transceiver 1130 transmits and receives a radio signal, and the channel state information extractor 1110 extracts channel state information of the CC.
  • the controller 1120 controls the transceiver 1130 and the channel state information extractor 1110.
  • the transceiver 1130 receives a signal in which a payload including channel state information is encoded from the user terminal, and the controller 1120 controls the channel state information extractor 1110.
  • a payload including channel state information is decoded and extracted from the signal, and the first group of component carriers recognized as activated by the user terminal and the second group of components recognized as deactivated by the payload. Check the carrier. In this case, an error detection code may be used to extract the signal.
  • the confirmation includes identifying the CC as the second carrier CC, wherein the CC as the value of the channel status information of the payload is the value of the most recently updated channel status information as shown in FIG. 13. That is, when recently updated channel state information is received as channel state information of the CC, it may be recognized that the user terminal is inactivated with respect to the CC. Of course, as described above, even when a dummy bit serving as a default value is received, the user terminal may be recognized as being inactive for the corresponding CC.
  • an error detection code combined with the channel state information payload may be used. That is, extracting a bitmap masked to the error detection code for the payload, and extracting and confirming information indicating the component carrier of the first group and the component carrier of the second group from the extracted bitmap. It may include. Since the number of component carriers configured is limited, the bitmaps that can be generated from them are also limited. Therefore, the error detection code and the bitmap information of the original payload can be extracted by applying the bitmap to the error detection code in the reverse direction. In addition, information indicating the component carrier of the first group and the component carrier of the second group may be extracted from the extracted bitmap.
  • the method of using the channel state information payload or the error detection code for the payload can be confirmed using both methods as shown in FIG. 16.
  • the controller 1120 may be different from the activation / deactivation of the component carrier recognized by the user terminal compared to whether the base station recognizes the activation / deactivation of the component carrier.
  • the transceiver 1130 may be controlled to transmit a command for processing or solving the problem.
  • the command for processing or resolving the ambiguity may be a command to deactivate from the component carriers of the first group or to select a component carrier to be activated from the component carriers of the second group to instruct the activation or deactivation of the selected component carrier.
  • it can be implemented in various ways.
  • the performance of the downlink determined by the reported CSI value can be maximized without increasing the overhead, and the ambiguity problem can be effectively solved.
  • the transmission of the most recently updated CSI information for the component carrier which is inactive based on UE recognition prevents downlink performance degradation as much as possible when the eNB recognizes activation, and the CRC masked is an existing field. There is no increase in overhead.

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Abstract

La présente invention porte sur un procédé et un appareil de transmission et de réception d'informations d'état de canal dans un système de communication sans fil. Selon un mode de réalisation de l'invention, le procédé de réception d'informations d'état de canal dans un système de communication sans fil comprend les étapes consistant à : placer des informations d'indication de requête de rapport indiquant un rapport d'informations d'état de canal non périodiques d'un terminal utilisateur dans un premier champ de données utile et placer des informations d'indication de mode représentant un procédé de rapport des informations d'état de canal d'une manière implicite dans un second champ ; transmettre un signal dans lequel les données utiles comprenant le premier champ et le second champ sont codées au terminal utilisateur et recevoir un signal comprenant des informations d'état de canal en provenance du terminal utilisateur ; et décoder le signal reçu conformément au procédé de rapport indiqué par les informations d'indication de mode afin d'extraire les informations d'état de canal. Les informations d'indication de mode indiquent un mode unique ou des modes multiples et peuvent être distinguées par un identificateur de mode calculé dans une architecture d'agrégation de porteuses et un procédé d'émission et/ou un procédé de modulation adaptative des informations d'indication de requête de rapport et le terminal utilisateur.
PCT/KR2012/000839 2011-02-08 2012-02-06 Procédé et appareil de transmission et de réception d'informations d'état de canal dans un système de communication sans fil WO2012108645A2 (fr)

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KR10-2011-0011272 2011-02-08
KR1020110011272A KR20120090705A (ko) 2011-02-08 2011-02-08 무선통신 시스템에서 채널 상태 정보를 송수신하는 방법 및 장치
KR1020110012816A KR20120092897A (ko) 2011-02-14 2011-02-14 무선통신 시스템에서 채널 상태 정보를 송수신하는 방법 및 장치
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WO2024007234A1 (fr) * 2022-07-07 2024-01-11 Qualcomm Incorporated Techniques de fourniture d'informations de rapport d'informations d'état de canal

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WO2024007234A1 (fr) * 2022-07-07 2024-01-11 Qualcomm Incorporated Techniques de fourniture d'informations de rapport d'informations d'état de canal

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