JP5663086B2 - Method and apparatus for transmitting control information in wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting control information. The wireless communication system can support carrier aggregation (CA).

  Wireless communication systems are widely deployed to provide various communication services such as voice and data. In general, a wireless communication system is a multiple access system that can support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of a multiple access system include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, and an OFDMA (orthogonal multiple access system). a carrier frequency division multiple access) system.

  An object of the present invention is to provide a method and apparatus for efficiently transmitting control information in a wireless communication system. Another object of the present invention is to provide a channel format, signal processing, and an apparatus therefor for efficiently transmitting control information. It is still another object of the present invention to provide a method and apparatus for efficiently allocating resources for transmitting control information.

  The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems that are not mentioned are described below. It will be clear to those with ordinary knowledge in this field.

  Preferably, the value of the TPC field of the PDCCH for the PDSCH signal on the PCell (Primary Cell) is used for transmission power control for the PUCCH format 3.

  Preferably, when the one or more PDSCH signals include a plurality of PDSCH signals on the SCell, a plurality of PDCCHs corresponding to the plurality of PDSCHs on the SCell are set to have the same TPC field value. The

  Preferably, the control information includes HARQ-ACK (Hybrid Automatic Repeat request Acknowledgement) for downlink transmission.

  Preferably, the aspect further includes receiving assignment information indicating a plurality of PUCCH resources for the antenna port p0, wherein the assignment information indicating the plurality of PUCCH resources for the antenna port p1 is a multiple antenna. It is further received only when port transmission is possible or when the multi-antenna port transmission mode is set. The upper layer includes an RRC (Radio Resource Control) layer.

  According to the present invention, control information can be efficiently transmitted in a wireless communication system. Further, it is possible to provide a channel format and a signal processing method for efficiently transmitting control information. Also, resources for control information transmission can be efficiently allocated.

  The effects obtained by the present invention are not limited to the effects mentioned above, and other effects that are not mentioned will be clear to those having ordinary knowledge in the technical field to which the present invention belongs from the following description. Will be understood.

  The accompanying drawings, which are included as part of the detailed description to assist in understanding the present invention, provide examples of the present invention and together with the detailed description, explain the technical idea of the present invention.

It is a figure which illustrates the general signal transmission method using the physical channel used for 3GPP LTE system which is an example of a radio | wireless communications system, and these channels. It is a figure which illustrates the structure of a radio frame. It is a figure which illustrates an uplink signal processing procedure. It is a figure which illustrates a downlink signal processing procedure. It is a figure which illustrates SC-FDMA system and OFDMA system. FIG. 3 is a diagram illustrating a signal mapping scheme on a frequency domain for satisfying a single carrier characteristic. FIG. 6 is a diagram illustrating a signal processing procedure in which DFT process output samples are mapped to a single carrier in cluster SC-FDMA. It is a figure which illustrates the signal processing procedure by which a DFT process output sample is mapped by multi-carrier (multi-carrier) in cluster SC-FDMA. It is a figure which illustrates the signal processing procedure by which a DFT process output sample is mapped by multicarrier in cluster SC-FDMA. It is a figure which illustrates the signal processing procedure in segment SC-FDMA. It is a figure which illustrates the structure of an uplink sub-frame. It is a figure which illustrates the signal processing procedure for transmitting a reference signal (Reference Signal: RS) by an uplink. It is a figure which illustrates DMRS (demodulation reference signal) structure for PUSCH. FIG. 3 is a diagram illustrating a DMRS structure for PUSCH. It is a figure which illustrates the slot level structure of PUCCH format 1a and 1b. It is a figure which illustrates the slot level structure of PUCCH format 1a and 1b. It is a figure which illustrates the slot level structure of PUCCH format 2 / 2a / 2b. It is a figure which illustrates the slot level structure of PUCCH format 2 / 2a / 2b. It is a figure which illustrates ACK / NACK channelization with respect to PUCCH formats 1a and 1b. FIG. 4 is a diagram illustrating channelization for a mixed structure of PUCCH format 1 / 1a / 1b and format 2 / 2a / 2b in the same PRB. It is a figure which illustrates PRB allocation for PUCCH transmission. It is a figure which illustrates the concept which manages a downlink component carrier in a base station. It is a figure which illustrates the concept which manages an uplink component carrier with a terminal. It is a figure which illustrates the concept that one MAC manages a multicarrier in a base station. It is a figure which illustrates the concept that one MAC manages multicarrier in a terminal. It is a figure which illustrates the concept that one MAC manages a multicarrier in a base station. It is a figure which illustrates the concept that several MAC manages a multicarrier in a terminal. It is a figure which illustrates the concept that several MAC manages a multicarrier in a base station. It is a figure which illustrates the concept that one or more MAC manages a multicarrier from a receiving viewpoint of a terminal. It is a figure which illustrates the asymmetric carrier aggregation with which several DL CC and one UL CC were linked. It is a figure which illustrates the structure of PUCCH format 3, and a signal processing procedure. It is a figure which illustrates the structure of PUCCH format 3, and a signal processing procedure. It is a figure which illustrates the structure of PUCCH format 3, and a signal processing procedure. It is a figure which illustrates the structure of PUCCH format 3, and a signal processing procedure. It is a figure which illustrates the structure of PUCCH format 3, and a signal processing procedure. It is a figure which illustrates the structure of PUCCH format 3, and a signal processing procedure. It is a figure which illustrates the structure of PUCCH format 3 with which RS multiplexing capacity was increased, and a signal processing process. It is a figure which illustrates the structure of PUCCH format 3 with which RS multiplexing capacity was increased, and a signal processing process. FIG. 6 shows a signal processing block / process for SORTD. It is a figure for demonstrating SORTD operation | movement generally. It is a figure which shows the base station and terminal which can be applied to this invention.

  The following technologies, CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), etc. It can be used for various wireless connection systems. CDMA may be a radio technology such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. The TDMA may be a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), and the like. UTRA is a part of UMTS (Universal Mobile Telecommunication Systems). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) is an advanced version of 3GPP LTE. In order to clarify the explanation, 3GPP LTE / LTE-A will be mainly described, but the technical idea of the present invention is not limited thereto.

  In a wireless communication system, a terminal receives information from a base station through a downlink (Downlink: DL), and the terminal transmits information to the base station through an uplink (Uplink: UL). Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type / use of information transmitted and received by these.

  FIG. 1 is a diagram for explaining physical channels used in the 3GPP LTE system and a general signal transmission method using these channels.

  In step S101, a terminal that has been turned on again or has newly entered the cell in an unpowered state performs an initial cell search operation such as synchronization with the base station. For this purpose, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH: Secondary Synchronization Channel) from the base station, and synchronizes with the base station to obtain information such as a cell ID. To win. Thereafter, the UE can acquire the broadcast information in the cell by receiving a physical broadcast channel from the base station. Meanwhile, the UE can check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search stage.

  In step S102, the user equipment that has completed the initial cell search receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) corresponding to the physical downlink control channel information. ) To obtain more specific system information.

  Thereafter, the terminal may perform a random access procedure (Random Access Procedure) as in steps S103 to S106 in order to establish a connection to the base station. For this purpose, the UE transmits a preamble through a physical random access channel (PRACH) (S103), and receives a response message for the preamble through the physical downlink control channel and the corresponding physical downlink shared channel. (S104). In the case of contention-based random access, contention resolution procedures such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) (Contention Resolution) Procedure) can be performed.

  The terminal that has performed the above procedure thereafter receives a physical downlink control channel / physical downlink shared channel (S107) and a physical uplink shared channel (PUSCH: Physical) as a general uplink / downlink signal transmission procedure. Transmission (S108) of an uplink shared channel (physical uplink control channel) can be performed. The control information transmitted from the terminal to the base station is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK), SR (Scheduling Request Indic), CQI (Channel Quality Indic), CQI (Channel Quality Indic). In this specification, HARQ ACK / NACK is simply referred to as HARQ-ACK or ACK / NACK (A / N). HARQ-ACK includes at least one of positive ACK (simply ACK), negative ACK (NACK), DTX, and NACK / DTX. UCI is mainly transmitted through PUCCH. However, when control information and traffic data are to be transmitted at the same time, UCI may be transmitted through PUSCH. In addition, UCI may be transmitted aperiodically through PUSCH according to a network request / instruction.

  FIG. 2 is a diagram illustrating the structure of a radio frame. In a cellular OFDM wireless packet communication system, transmission of uplink / downlink data packets is performed in units of subframes, and one subframe is defined as a certain time interval including a number of OFDM symbols. The 3GPP LTE standard supports a type 1 radio frame structure applicable to FDD (Frequency Division Duplex) and a type 2 radio frame structure applicable to TDD (Time Division Duplex).

  FIG. 2A illustrates the structure of a type 1 radio frame. The downlink radio frame is composed of 10 subframes, and one subframe is composed of 2 slots in the time domain. The time taken for one subframe to be transmitted is called TTI (transmission time interval). For example, the length of one subframe may be 1 ms, and the length of one slot may be 0.5 ms. One slot includes a plurality of OFDM symbols in the time domain, and includes a plurality of resource blocks (RBs) in the frequency domain. In the 3GPP LTE system, since OFDMA is used in the downlink, an OFDM symbol represents one symbol period. An OFDM symbol can also be referred to as an SC-FDMA symbol or a symbol interval. A resource block (RB) as a resource allocation unit may include a plurality of continuous subcarriers in one slot.

  The number of OFDM symbols included in one slot may differ depending on the configuration of a CP (Cyclic Prefix). The CP includes an extended CP (extended CP) and a standard CP (normal CP). For example, when the OFDM symbol is configured by a standard CP, the number of OFDM symbols included in one slot may be seven. When an OFDM symbol is configured with an extended CP, the length of one OFDM symbol increases, so the number of OFDM symbols included in one slot is smaller than that of a standard CP. In the case of the extended CP, for example, the number of OFDM symbols included in one slot may be six. An extended CP can be used to further reduce intersymbol interference when the channel conditions are not stable, such as when the terminal moves at high speed.

  When standard CP is used, since one slot includes 7 OFDM symbols, one subframe includes 14 OFDM symbols. In this case, a maximum of three OFDM symbols at the head of each subframe can be assigned to a PDCCH (physical downlink control channel), and the remaining OFDM symbols can be assigned to a PDSCH (physical downlink shared channel).

  FIG. 2B illustrates the structure of a type 2 radio frame. A type 2 radio frame is composed of two half frames. Each half frame includes five subframes, a DwPTS (Downlink Pilot Time Slot), a guard period (Guard Period, GP), and an UpPTS ( (Uplink Pilot Time Slot), and one subframe is composed of two slots. DwPTS is used for initial cell search, synchronization or channel estimation at the terminal. UpPTS is used to match channel estimation at the base station with uplink transmission synchronization of the terminal. The protection section is a section for removing interference generated in the uplink due to multipath delay of the downlink signal between the uplink and the downlink.

  The structure of the above radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slots can be variously changed.

  FIG. 3A is a diagram for explaining a signal processing procedure for a terminal to transmit an uplink signal.

  In order to transmit the uplink signal, the UE can scramble the transmission signal using the UE-specific scramble signal in the scrambling module 210. The scrambled signal is input to the modulation mapper 220, and BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), or 16QAM / 64QAM (Quadrature Amplification) based on the type and / or channel state of the transmission signal. And modulated into a complex symbol. After the modulated complex symbols are processed by transform precoder 230, they are input to resource element mapper 240, which can map the complex symbols to time-frequency resource elements. The signal thus processed can be transmitted from the antenna to the base station via the SC-FDMA signal generator 250.

  FIG. 3B is a diagram for explaining a signal processing procedure for the base station to transmit a downlink signal.

  In the 3GPP LTE system, the base station can transmit one or more codewords in the downlink. Each codeword can be a complex symbol through the scramble module 301 and modulation mapper 302, similar to the uplink of FIG. 3A. Thereafter, the complex symbols can be mapped to a plurality of layers by the layer mapper 303, and each layer can be multiplied by the precoding matrix and assigned to each transmission antenna by the precoding module 304. Each of the transmission signals for each antenna processed in this way is mapped to a time-frequency resource element by the resource element mapper 305, and thereafter transmitted from each antenna via an OFDM (Orthogonal Frequency Division Multiple Access) signal generator 306. Can do.

  When a terminal transmits a signal on the uplink in a wireless communication system, PAPR (Peak-to-Average Ratio) becomes a problem compared to a case where a base station transmits a signal on the downlink. Therefore, as described in FIGS. 3A and 3B, the SC-FDMA (Single Carrier-Frequency Multiple Access) method is used for uplink signal transmission instead of the OFDMA method used for downlink signal transmission. .

  FIG. 4 is a diagram for explaining the SC-FDMA scheme and the OFDMA scheme. 3GPP systems employ OFDMA on the downlink and SC-FDMA on the uplink

  Referring to FIG. 4, a terminal for uplink signal transmission and a base station for downlink signal transmission include a serial-to-parallel converter 401, a subcarrier mapper 403, an M-point IDFT. It is the same in that a module 404, a parallel-to-serial converter 405, and a CP (Cyclic Prefix) addition module 406 are provided. However, a terminal for transmitting a signal using the SC-FDMA scheme further includes an N-point DFT module 402. The N-point DFT module 402 cancels a part of the IDFT processing effect of the M-point IDFT module 404 so that the transmission signal has a single carrier property.

  FIG. 5 is a diagram illustrating a signal mapping method on the frequency domain for satisfying a single carrier characteristic in the frequency domain. FIG. 5A shows a local mapping method, and FIG. 5B shows a distributed mapping method.

  A clustered SC-FDMA, which is a modified form of SC-FDMA, will be described. Cluster SC-FDMA divides the DFT process output samples into sub-groups in the sub-carrier mapping process, and discontinuously maps them in the frequency domain (or sub-carrier domain).

  FIG. 6 is a diagram illustrating a signal processing procedure in which DFT process output samples are mapped to a single carrier in cluster SC-FDMA. 7 and 8 are diagrams illustrating a signal processing procedure in which DFT process output samples are mapped to multi-carriers in cluster SC-FDMA. FIG. 6 is an example in which an intra-carrier cluster SC-FDMA is applied, and FIGS. 7 and 8 correspond to an example in which an inter-carrier cluster SC-FDMA is applied. FIG. 7 shows a single IFFT when subcarrier spacing between adjacent component carriers is aligned in a situation where component carriers are allocated contiguously in the frequency domain. An example of generating a signal through a block is shown. FIG. 8 illustrates a case in which a signal is generated through a plurality of IFFT blocks in a situation where component carriers are allocated non-continuously in the frequency domain.

  FIG. 9 is a diagram illustrating a signal processing procedure of segmented SC-FDMA.

  In the segment SC-FDMA, the same number of IFFTs as an arbitrary number of DFTs are applied, and the relationship between the DFT and IFFT has a one-to-one relationship. It is an extension of the subcarrier mapping configuration and is also expressed as NxSC-FDMA or NxDFT-s-OFDMA. These are collectively referred to as segment SC-FDMA in this specification. Referring to FIG. 9, segment SC-FDMA divides the entire time domain modulation symbols into N (N is an integer greater than 1) groups and relaxes the DFT process on a group basis in order to relax the single carrier characteristic condition. I do.

  FIG. 10 is a diagram illustrating a structure of an uplink subframe.

  Referring to FIG. 10, the uplink subframe includes a plurality of (eg, two) slots. Each slot may have a different number of SC-FDMA symbols depending on the length of CP (Cyclic Prefix). As an example, in the case of a normal CP, a slot may have 7 SC-FDMA symbols. The uplink subframe is classified into a data area and a control area. The data area includes PUSCH and is used to transmit a data signal such as voice. The control area includes PUCCH and is used to transmit control information. PUCCH is an RB pair (RB pair) (eg, m = 0, 1, 2, 3) located at both ends of the data area on the frequency axis (eg, an RB pair at a frequency reflected position). ) And hop the slot to the boundary. Uplink control information (that is, UCI) includes HARQ ACK / NACK, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), and the like.

  FIG. 11 is a diagram for explaining a signal processing procedure for transmitting a reference signal in the uplink. Compared to the case where data is converted to a frequency domain signal through a DFT precoder and then transmitted through IFFT after frequency mapping, the RS does not go through the DFT precoder. That is, after the RS sequence is directly generated (S11) in the frequency domain, the RS is transmitted through the localization mapping (S12), the IFFT process (S13), and the CP (Cyclic Prefix) addition process (S14) in sequence.

  Here, the q-th root Zadoff-chu sequence can be defined by the following mathematical formula 3.

  Here, q satisfies the following mathematical formula 4.

  On the other hand, RS hopping will be described as follows.

  Here, mod represents a modulo operation.

  There are 17 different hopping patterns and 30 different sequence shift patterns. Sequence group hopping is enabled or disabled depending on a parameter that activates group hopping provided by higher layers.

  PUCCH and PUSCH have the same hopping pattern, but can have different sequence shift patterns.

  Hereinafter, sequence hopping will be described.

  The reference signal for PUSCH is determined as follows.

  The physical mapping method for uplink RS in PUSCH is as follows.

  12A is a diagram illustrating a DMRS (demodulation reference signal) structure for PUSCH in the case of a standard CP (normal CP), and FIG. 12B is a diagram illustrating a DMRS structure for PUSCH in the case of an extended CP (extended CP). FIG. In FIG. 12A, DMRS is transmitted through the fourth and eleventh SC-FDMA symbols, and in FIG. 12B, DMRS is transmitted through the third and ninth SC-FDMA symbols.

FIG. 13 to FIG. 16 are examples showing the slot level structure of the PUCCH format. The PUCCH includes the following format for transmitting control information.
(1) Format 1: Used for On-Off keying (OOK) modulation, scheduling request (SR) (2) Format 1a and Format 1b: ACK / NACK (Acknowledgement / Negative Acknowledgment) 1) Format 1a: BPSK ACK / NACK for one codeword
2) Format 1b: QPSK ACK / NACK for two codewords
(3) Format 2: Used for QPSK modulation and CQI transmission (4) Format 2a and Format 2b: Used for simultaneous transmission of CQI and ACK / NACK

  Table 4 shows the modulation scheme according to the PUCCH format and the number of bits per subframe. Table 5 represents the number of RSs per slot according to the PUCCH format. Table 6 represents the SC SC-FDMA symbol position of the RS according to the PUCCH format. In Table 4, PUCCH formats 2a and 2b correspond to the standard CP.

  FIG. 13 shows PUCCH formats 1a and 1b in the case of standard CP. FIG. 14 shows PUCCH formats 1a and 1b in the case of extended CP. In the PUCCH formats 1a and 1b, control information having the same content is repeated for each slot in a subframe. From each terminal, an ACK / NACK signal is transmitted through a different cyclic shift (CS) (frequency domain code) and orthogonal cover code (orthogonal cover code) in a CG-CAZAC (Computer-Generated Constant Amplitude Zero Correlation) sequence. code: OC or OCC) (time domain spreading code) and transmitted through different resources. The OC includes, for example, a Walsh / DFT orthogonal code. If the number of CSs is 6 and the number of OCs is 3, a total of 18 terminals can be multiplexed in the same PRB (Physical Resource Block) based on a single antenna. The orthogonal sequences w0, w1, w2, w3 may be applied in any time domain (after FFT modulation) or in any frequency domain (before FFT modulation).

  For SR and persistent scheduling, ACK / NACK resources composed of CS, OC, and PRB (Physical Resource Block) can be provided to the terminal through RRC (Radio Resource Control). For dynamic ACK / NACK and non-persistent scheduling, the ACK / NACK resource is implicitly assigned by the lowest CCE (Control Channel Element) index of the PDCCH corresponding to the PDSCH. ) Can be given to the terminal.

  FIG. 15 shows PUCCH format 2 / 2a / 2b in the case of standard CP. FIG. 16 shows PUCCH format 2 / 2a / 2b in the case of extended CP. Referring to FIGS. 15 and 16, in the case of standard CP, one subframe includes 10 QPSK data symbols in addition to RS symbols. Each QPSK symbol is spread in the frequency domain by CS and then mapped to the corresponding SC-FDMA symbol. SC-FDMA symbol level CS hopping can be applied to randomize inter-cell interference. RS can be multiplexed by CDM using cyclic shift. For example, if the number of available CSs is 12 or 6, 12 or 6 terminals can be multiplexed in the same PRB, respectively. In short, in the PUCCH formats 1 / 1a / 1b and 2 / 2a / 2b, a plurality of terminals can be multiplexed by CS + OC + PRB and CS + PRB, respectively.

  The length 4 and length 3 orthogonal sequences (OC) for the PUCCH format 1 / 1a / 1b are as shown in Table 7 and Table 8 below.

  In PUCCH format 1a / 1b, the orthogonal sequence (OC) for RS is as shown in Table 9 below.

  FIG. 18 is a diagram illustrating channelization for a mixed structure of PUCCH format 1a / 1b and format 2 / 2a / 2b in the same PRB.

Cyclic shift (CS) hopping and orthogonal cover (OC) remapping are applicable as follows.
(1) Symbol-based cell-specific CS hopping for randomization of inter-cell interference (2) Slot-level CS / OC remapping 1) For randomization of inter-cell interference 2) ACK / Slot based approach for mapping between NACK channel and resource (k)

On the other hand, the resource (n _r ) for PUCCH format 1a / 1b includes the following combinations.
(1) CS (= same as DFT orthogonal code at symbol level) (n _cs )
(2) OC (orthogonal cover at slot level) (n _oc )
(3) Frequency RB (Resource Block) (n _rb )

If the indexes representing CS, OC, and RB are n _cs , n _oc , and n _rb , the representative index n _r includes n _cs , n _oc , and n _rb . n _r satisfies n _r = (n _cs , n _oc , n _rb ).

  The combination of CQI, PMI, RI, and CQI and ACK / NACK can be transmitted through PUCCH format 2 / 2a / 2b. Reed Muller (RM) channel coding can be applied.

  Here, i = 0, 1, 2,..., B-1 is satisfied.

  Table 11 shows UCI (Uplink Control Information) fields for wideband reporting (single antenna port, transmit diversity or open loop spatial multiplexing PDSCH) CQI feedback.

  Table 12 represents the UCI field for CQI and PMI feedback for wideband, which reports a closed loop spatial multiplexing PDSCH transmission.

  Table 13 represents the UCI field for RI feedback for wideband reporting.

FIG. 19 is a diagram illustrating PRB allocation. As shown in FIG. 19, it is possible to use a PRB for PUCCH transmission in slot n _s.

  A multi-carrier system or a carrier aggregation system refers to a system in which a plurality of carriers having a band smaller than a target band (bandwidth) are integrated and used for broadband support. When a plurality of carriers having a band smaller than the target band are integrated, the band of the carriers to be integrated may be limited to a bandwidth used in the existing system in order to be compatible with the existing system. For example, an existing LTE system supports a bandwidth of 1.4, 3, 5, 10, 15, and 20 MHz, and an LTE-A (LTE-Advanced) system developed from the LTE system has a bandwidth supported by the LTE. Can be used to support bandwidths greater than 20 MHz. Alternatively, carrier aggregation may be supported by defining a new bandwidth regardless of the bandwidth used in the existing system. Multi-carrier is a name that can be used in combination with carrier aggregation and bandwidth integration. Further, the carrier aggregation is a generic term for adjacent carrier aggregation and non-contiguous carrier aggregation.

  FIG. 20 is a diagram illustrating a concept of managing downlink component carriers in the base station, and FIG. 21 is a diagram illustrating a concept of managing uplink component carriers in the terminal. For the convenience of explanation, in the following, in FIG. 20 and FIG.

  FIG. 22 illustrates the concept that one MAC manages multiple carriers in a base station. FIG. 23 illustrates the concept that one MAC manages multiple carriers in a terminal.

  Referring to FIGS. 22 and 23, one MAC manages and operates one or more frequency carriers to perform transmission / reception. Since the frequency carriers managed by one MAC do not need to be adjacent to each other, there is an advantage that it is more flexible in terms of resource management. In FIG. 22 and FIG. 23, one PHY means one component carrier for convenience. Here, one PHY does not necessarily mean an independent RF (Radio Frequency) device. In general, one independent RF device means one PHY, but is not limited thereto, and one RF device may include a plurality of PHYs.

  FIG. 24 illustrates a concept in which a plurality of MACs manage multicarriers in a base station. FIG. 25 illustrates a concept in which a plurality of MACs manage multicarriers in a terminal. FIG. 26 illustrates another concept in which a plurality of MACs manage multicarriers in a base station. FIG. 27 illustrates another concept in which a plurality of MACs manage multicarriers in a terminal.

  The structure is not limited to that shown in FIGS. 22 and 23, and a plurality of carriers can be controlled by a plurality of MACs instead of a single MAC, as shown in FIGS.

  As shown in FIG. 24 and FIG. 25, each carrier can be controlled by 1: 1 of each MAC. As shown in FIG. 26 and FIG. 27, for some carriers, each carrier is assigned to each carrier. The MAC can be controlled by 1: 1, and one MAC can control the remaining one or more carriers.

  The system described above is a system including a large number of 1 to N carriers, and each carrier may be used adjacently or may be used non-contiguously. This is applicable regardless of uplink / downlink. The TDD system is configured to operate N majority carriers including downlink and uplink transmissions within each carrier, and the FDD system is configured to use a number of carriers for uplink and downlink, respectively. Is done. In the case of FDD systems, the number of carriers integrated in the uplink and downlink and / or the bandwidth of the carriers can also support other asymmetric carrier aggregations.

  If the number of component carriers integrated in the uplink and downlink is the same, all component carriers can be configured to be compatible with the existing system. However, component carriers that do not consider compatibility are not excluded from the present invention.

Hereinafter, for convenience of explanation, when the PDCCH is transmitted on the downlink component carrier # 0, the corresponding PDSCH is transmitted on the downlink component carrier # 0, but the cross-carrier scheduling (cross) is described. It is obvious that the corresponding PDSCH may be transmitted through other downlink component carriers by applying -carrier scheduling. The term “component carrier” may be another equivalent term (eg, cell).
FIG. 28 exemplifies a scenario in which uplink control information (UCI) is transmitted in a wireless communication system that supports carrier aggregation. For convenience, this example assumes that UCI is ACK / NACK (A / N). However, this is for convenience of explanation, and UCI uses control information such as channel state information (CSI) (eg, CQI, PMI, RI) and scheduling request information (eg, SR). Can be included without limitation.

FIG. 28 illustrates an asymmetric carrier aggregation in which five DL CCs are linked to one UL CC. The illustrated asymmetric carrier aggregation may be set from the viewpoint of UCI transmission. That is, the DL CC-UL CC linkage for UCI and the DL CC-UL CC linkage for data can be set differently. For convenience, if one DL CC can transmit a maximum of two codewords, the UL ACK / NACK bit also needs at least two bits. In this case, at least 10 ACK / NACK bits are required to transmit ACK / NACK for data received through 5 DL CCs through one UL CC. In order to support the DTX state for each DL CC, at least 12 bits (= 5 ⁵ = 3125 = 11.61 bits) are required for ACK / NACK transmission. Since the existing PUCCH format 1a / 1b can send ACK / NACK up to 2 bits, this structure cannot transmit increased ACK / NACK information. Although carrier aggregation was cited as the cause of the increase in the amount of UCI information, it is also due to the increase in the number of antennas, the presence of backhaul subframes in TDD systems, and relay systems. Similar to ACK / NACK, when control information related to a plurality of DL CCs is to be transmitted through one UL CC, the amount of control information to be transmitted increases. For example, the UCI payload may increase when CQI / PMI / RI for multiple DL CCs must be transmitted.

  A DL primary CC can be defined as a DL CC linked to a UL primary CC. Here, the linkage encompasses both an implicit and explicit linkage. In LTE, one DL CC and one UL CC are uniquely paired. For example, a DL CC linked to a UL primary CC by LTE pairing can be referred to as a DL primary CC. This can be called implicit linkage. Explicit linkage means that the network configures the linkage in advance, and can be signaled by RRC or the like. In explicit linkage, a DL CC that is paired with a UL primary CC may be referred to as a primary DL CC. Here, the UL primary (or anchor) CC may be a UL CC in which the PUCCH is transmitted. Alternatively, the UL primary CC may be a UL CC in which UCI is transmitted through PUCCH or PUSCH. Alternatively, the DL primary CC may be configured through higher layer signaling. Alternatively, the DL primary CC may be a DL CC to which the terminal has made initial connection. In addition, DL CCs other than the DL primary CC can be called DL secondary CCs. Similarly, UL CCs other than the UL primary CC can be referred to as UL secondary CCs.

  LTE-A uses the concept of a cell to manage radio resources. A cell is defined by a combination of a downlink resource and an uplink resource, and the uplink resource is not an essential element. Therefore, the cell can be configured with downlink resources alone or with downlink resources and uplink resources. When carrier aggregation is supported, the linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource may be indicated by the system information. . A cell operating on the primary frequency (or PCC) can be referred to as a primary cell (Primary Cell, PCell), and a cell operating on the secondary frequency (or SCC) can be referred to as a secondary cell (Secondary Cell, SCell). For simplicity, the DL CC and UL CC may be referred to as a DL cell and a UL cell, respectively. Further, the anchor (or primary) DL CC and the anchor (or primary) UL CC can be referred to as DL PCell (Primary Cell) and UL PCell, respectively. The PCell is used for a terminal to perform an initial connection establishment procedure or a connection re-establishment procedure. The PCell may be a cell indicated in the handover process. The SCell can be configured after an RRC connection is established and can be used to provide additional radio resources. PCell and SCell can also be collectively referred to as a serving cell. Therefore, in the case of a terminal that is in the RRC_CONNECTED state but carrier aggregation is not set or does not support carrier aggregation, there is only one serving cell configured only by PCell. On the other hand, in the case of the terminal in the RRC_CONNECTED state and the carrier aggregation is set, one or more serving cells exist, and the entire serving cell includes the PCell and the entire SCell. For carrier aggregation, the network supports carrier aggregation for one or more SCells in addition to the PCell initially configured in the connection establishment process after the initial security activation process is initiated. Can be configured for a terminal.

  DL-UL pairing may be limited to FDD. Since TDD uses the same frequency, there is no need to define DL-UL pairing separately. Also, the DL-UL linkage can be determined from the UL linkage through SEAR2 UL EARFCN (E-UTRA Absolute Radio Frequency Channel Number) information. For example, DL-UL linkage can be obtained through SIB2 decoding at the initial connection, otherwise through RRC signaling. Therefore, only SIB2 linkage exists and other DL-UL pairings need not be explicitly defined. For example, in the 5DL: 1UL structure of FIG. 28, DL CC # 0 and UL CC # 0 have a SIB2 linkage relationship, and the remaining DL CCs have a SIB2 linkage relationship with other UL CCs not set in the terminal. Can have.

  A new method is required to support the scenario as shown in FIG. Hereinafter, in a communication system that supports carrier aggregation, the PUCCH format for feeding back UCI (eg, multiple A / N bits) is referred to as CA PUCCH format (or PUCCH format 3). For example, PUCCH format 3 is used to transmit A / N information (which may include a DTX state) corresponding to PDSCH (or PDCCH) transmitted from multiple DL serving cells.

  29A to 29F illustrate the structure of PUCCH format 3 and the signal processing procedure.

  FIG. 29A illustrates a case where PUCCH format 3 is applied to the structure of PUCCH format 1 (standard CP). Referring to FIG. 29A, a channel coding block performs channel coding on information bits a_0, a_1,..., A_M−1 (eg, multiple ACK / NACK bits) to generate coded bits or coding bits. ) (Or code word) b_0, b_1, ..., b_N-1. M represents the size of information bits, and N represents the size of coding bits. The information bits include uplink control information (UCI), for example, multiple ACK / NACK for a plurality of data (or PDSCH) received through a plurality of DL CCs. Here, the information bits a_0, a_1,..., A_M−1 are jointly coded regardless of the type / number / size of the UCI constituting the information bits. For example, when the information bits include multiple ACK / NACKs for multiple DL CCs, channel coding is performed on the entire bit information without performing the DL CC and individual ACK / NACK bits separately, thereby A codeword is generated. The channel coding includes, but is not limited to, simple repetition, simple coding, RM (Reed Muller) coding, punctured RM coding, TBCC (Tail-biting convolutional coding). LDPC (low-density parity-check) or turbo coding can be used. Although not shown, the coding bits may be rate-matched in consideration of the modulation order and the resource amount. The rate matching function may be included as part of the channel coding block or may be performed by another functional block. For example, the channel coding block may perform (32,0) RM coding on a plurality of control information to obtain a single codeword, and perform circular buffer rate-matching on the codeword.

  The modulator modulates the coding bits b_0, b_1, ..., b_N-1 to generate modulation symbols c_0, c_1, ..., c_L-1. L represents the size of the modulation symbol. Modulation is done by modifying the size and phase of the transmitted signal. The modulation method includes, for example, n-PSK (Phase Shift Keying) and n-QAM (Quadrature Amplitude Modulation) (n is an integer of 2 or more). Specifically, BPSK (Binary PSK), QPSK (Quadrature PSK), 8-PSK, QAM, 16-QAM, 64-QAM, or the like can be used as a modulation method.

  A divider divides the modulation symbols c_0, c_1,..., C_L−1 into slots. The order / pattern / system for dividing the modulation symbol into each slot is not particularly limited. For example, the frequency divider can divide the modulation symbols into respective slots in order from the front (local type). In this case, as shown in the figure, modulation symbols c_0, c_1,..., C_L / 2-1 are divided into slot 0, and modulation symbols c_L / 2, c_L / 2 + 1,. I can go around. In addition, the modulation symbols can be interleaved (or permutated) when divided into the respective slots. For example, even-numbered modulation symbols can be divided into slots 0, and odd-numbered modulation symbols can be divided into slots 1. The order of the modulation process and the frequency division process may be switched.

  A DFT precoder performs DFT precoding (eg, 12-point DFT) on the modulation symbols divided in each slot to generate a single carrier waveform. In the same figure, modulation symbols c_0, c_1,..., C_L / 2-1 that have been frequency-divided into slot 0 are DFT precoded as DFT symbols d_0, d_1,. The modulated symbols c_L / 2, c_L / 2 + 1,..., C_L−1 are DFT precoded as DFT symbols d_L / 2, d_L / 2 + 1,. DFT precoding can be replaced by other corresponding linear operations (eg, walsh precoding).

  The spreading block spreads the DFT signal at the SC-FDMA symbol level (time domain). SC-FDMA symbol level time domain spreading is performed using spreading codes (or spreading sequences). The spreading code includes a quasi-orthogonal code and an orthogonal code. The quasi-orthogonal code includes, but is not limited to, a PN (Pseudo Noise) code. The orthogonal code includes, but is not limited to, a Walsh code and a DFT code. The orthogonal code (OC) may be mixed with the orthogonal sequence, the orthogonal cover (OC), and the orthogonal cover code (OCC). In this specification, for ease of explanation, an orthogonal code will be described as a representative example of a spreading code. However, this is an example, and the orthogonal code can be replaced with a quasi-orthogonal code. The maximum value of the spreading code size (or spreading factor (SF)) is limited by the number of SC-FDMA symbols used for control information transmission. As an example, when four SC-FDMA symbols are used for control information transmission in one slot, (quasi) orthogonal codes w0, w1, w2, and w3 of length 4 can be used for each slot. SF means a degree of spreading of control information, and can be related to a multiplexing order of a terminal or an antenna multiplexing order. SF can be varied according to system requirements such as 1, 2, 3, 4,..., And can be defined in advance between the base station and the terminal, or can be notified to the terminal through DCI or RRC signaling. For example, when one of the control information SC-FDMA symbols is punctured to transmit SRS, the control information of the slot is reduced to SF (eg, SF = 4 instead of SF = 4). 3) A spreading code can be applied.

  The signal generated through the above process is mapped to a subcarrier in the PRB, and then converted into a time domain signal through IFFT. A CP is added to the time domain signal, and the generated SC-FDMA symbol is transmitted through the RF end.

  Each process will be described more specifically by taking the case of transmitting ACK / NACK for 5 DL CCs. If each DL CC can transmit two PDSCHs, the ACK / NACK bit for this may be 12 bits when it includes a DTX state. When assuming QPSK modulation and SF = 4 time spreading, the coding block size (after rate matching) may be 48 bits. The coding bits are modulated into 24 QPSK symbols, and 12 generated QPSK symbols are divided into each slot. In each slot, 12 QPSK symbols are converted to 12 DFT symbols through a 12-point DFT operation. In each slot, 12 DFT symbols are spread and mapped into 4 SC-FDMA symbols using SF = 4 spreading code in the time domain. Since 12 bits are transmitted through [2 bits * 12 subcarriers * 8 SC-FDMA symbols], the coding rate is 0.0625 (= 12/192). When SF = 4, a maximum of 4 terminals can be multiplexed per 1 PRB.

  The signal processing procedure described with reference to FIG. 29A is merely an example, and the signal mapped to the PRB in FIG. 29A may be obtained through various equivalent signal processing procedures. A signal processing procedure equivalent to that illustrated in FIG. 29A will be described with reference to FIGS. 29B to 29F.

  FIG. 29B is obtained by switching the processing order of the DFT precoder and the spreading block in FIG. 29A. In FIG. 29A, the function of the spreading block is equivalent to multiplying the DFT symbol sequence output from the DFT precoder by a specific constant at the SC-FDMA symbol level. The value of the signal to be performed is the same. Therefore, the signal processing procedure for PUCCH format 3 can be in the order of channel coding, modulation, frequency division, spreading, and DFT precoding. In this case, the frequency division process and the diffusion process may be performed by one functional block. As an example, each modulation symbol can be spread at the SC-FDMA symbol level simultaneously with the frequency division while the modulation symbol is alternately divided into each slot. As another example, when a modulation symbol is divided into each slot, each modulation symbol is copied so as to correspond to the size of the spreading code, and each element of the modulation symbol and the spreading code is applied on a one-to-one basis. Can do. For this reason, the modulation symbol sequence generated for each slot is spread to a plurality of SC-FDMA symbols at the SC-FDMA symbol level. Thereafter, the complex symbol sequence corresponding to each SC-FDMA symbol is DFT precoded in units of SC-FDMA symbols.

  FIG. 29C is obtained by switching the processing order of the modulator and the frequency divider in FIG. 29A. Therefore, the processing procedure for PUCCH format 3 is performed in the order of joint channel coding and frequency division at the subframe level, and in the order of modulation, DFT precoding, and spreading at each slot level.

  FIG. 29D is obtained by further replacing the processing order of the DFT precoder and the spreading block in FIG. 29C. As described above, the function of the spreading block is equivalent to multiplying the DFT symbol sequence output from the DFT precoder by a specific constant at the SC-FDMA symbol level. The value of the signal mapped to the symbol is the same. Accordingly, in the signal processing procedure for PUCCH format 3, joint channel coding and frequency division are performed at the subframe level, and modulation is performed at each slot level. The modulation symbol sequence generated for each slot is spread into a plurality of SC-FDMA symbols at the SC-FDMA symbol level, and the modulation symbol sequence corresponding to each SC-FDMA symbol is in DFT precoding order in units of SC-FDMA symbols. Become. In this case, the modulation process and the spreading process may be performed by one functional block. As an example, while modulating the coding bits, the generated modulation symbols can be immediately spread at the SC-FDMA symbol level. As another example, the modulation symbols generated during the modulation of the coding bits can be copied so as to correspond to the size of the spreading code, and each element of these modulation symbols and the spreading code can be applied one-to-one.

  FIG. 29E shows a case where PUCCH format 3 is applied to the structure of PUCCH format 2 (standard CP), and FIG. 29F shows a case where PUCCH format 3 is applied to the structure of PUCCH format 2 (extended CP). The basic signal processing procedure is as described with reference to FIGS. 29A to 29D. Since the existing LTE PUCCH format 2 structure is reused, the number / position of UCI SC-FDMA symbols and RS SC-FDMA symbols in PUCCH format 3 differs from FIG. 29A.

  Table 14 shows the positions of RS SC-FDMA symbols in the illustrated PUCCH format 3. In the case of the standard CP, the number of SC-FDMA symbols in the slot is 7 (index: 0 to 6), and in the case of the extended CP, the number of SC-FDMA symbols in the slot is 6 (index: 0 to 5). To do.

  Here, the RS can inherit the structure of the existing LTE. For example, the RS sequence can be defined by a cyclic shift of the basic sequence (see Equation 1).

  FIG. 31 shows the structure of another PUCCH format 3 with an increased multiplexing capacity. If slot-level frequency hopping is not performed, the multiplexing capacity can be further doubled by further spreading or covering (eg, Walsh covering) in units of slots. If there is slot-level frequency hopping and Walsh covering is applied on a slot basis, orthogonality may be lost due to differences in channel conditions experienced in each slot. The slot unit spreading code for RS (eg, orthogonal code cover) is not limited to this, but [x1 x2] = [1 1], [1 -1] Walsh cover, or its linear The conversion form (eg, [j j] [j −j], [1 j] [1 −j], etc.) is included. x1 applies to the first slot and x2 applies to the second slot. In the drawing, it is shown that spreading (or covering) is performed at the SC-FDMA symbol level after spreading at the slot level (or covering), but the order of these may be changed.

  The signal processing process of PUCCH format 3 will be described using mathematical formulas. For the sake of convenience, a case where an OCC having a length of -5 is used (eg, FIGS. 29E to 32) will be taken up.

  The block-spread complex symbol set may be cyclically shifted according to the following equation.

FIG. 32 illustrates a signal processing block / process for SORTD. Basic processes other than the process for multi-antenna transmission are as described with reference to FIGS. Referring to FIG. 32, modulation symbols c_0,. In the case of this example, it is shown that one DFT operation is performed for a plurality of antenna ports, but the DFT operation can also be performed for each antenna port. In addition, it is illustrated that the DFT precoded symbols d_0,..., D_23 are transmitted through the second OC / PRB while being copied, but the DFT precoded symbols d_0,. The configured form (eg, conjugate complex or scaling) may be transmitted over the second OC / PRB. For example, in order to ensure orthogonality between PUCCH signals transmitted via different antenna ports, [OC ⁽⁰⁾ ≠ OC ⁽¹⁾ ; PRB ⁽⁰⁾ = PRB ⁽¹⁾ ], [OC ⁽⁰⁾ = OC ⁽¹⁾ ; PRB ⁽⁰⁾ ≠ PRB ⁽¹⁾ ], [OC ⁽⁰⁾ ≠ OC ⁽¹⁾ ; PRB ⁽⁰⁾ ≠ PRB ⁽¹⁾ ] is possible. Here, the superscript represents an antenna port number or a value corresponding thereto.

  FIG. 33 is a diagram for schematically explaining the SORTD operation. Referring to FIG. 33, the terminal acquires a first resource index and a second resource index (S3310). Here, the resource index (or resource value) indicates a PUCCH resource index (or PUCCH resource value), preferably a PUCCH format 3 resource index (or PUCCH format 3 resource value). Step S3310 may include a plurality of steps that are temporally different. Details of the first resource index and the second resource index acquisition method will be described later. Subsequently, the terminal transmits the PUCCH signal using the PUCCH resource corresponding to the first resource index, and transmits the PUCCH signal via the first antenna (port) (S3320). Also, the terminal transmits the PUCCH signal using the PUCCH resource corresponding to the second resource index, and transmits the PUCCH signal via the second antenna (port) (S3330). Steps S3320 and S3330 are performed in the same subframe.

  The PUCCH signal may include HARQ-ACK (Hybrid Automatic Repeat reQuest Acknowledgment). HARQ-ACK includes a response to a downlink signal (eg, ACK, NACK, DTX or NACK / DTX). When the PUCCH signal includes HARQ-ACK, although not shown, the process of FIG. 33 further includes a process of receiving a downlink signal. The process of receiving a downlink includes receiving a PDCCH for downlink scheduling and receiving a PDSCH corresponding to the PDCCH. For PUCCH format 3 transmission, at least one of PDCCH and PDSCH can be received on the SCell.

  As described with reference to FIGS. 32 and 33, multi-antenna (port) transmission (eg, SORTD) requires a larger amount of orthogonal resources than single antenna (port) transmission. For example, at the time of 2Tx SORTD transmission, an orthogonal resource twice as much as that of a single antenna (port) transmission is required. Therefore, the antenna (port) transmission mode is directly connected to the number of terminals that can be multiplexed in the resource region for the PUCCH, that is, the multiplexing capacity. Therefore, the base station needs to set the antenna (port) transmission mode in a fluid manner according to the number of communicating terminals. For example, when the number of terminals to be accommodated by the base station is small, a multi-antenna (port) transmission mode (eg, SORTD mode) using multiplex-resources may be configured for each terminal, and the number of terminals to be accommodated If there are many, a single antenna (port) transmission mode using a single resource may be configured. An antenna (port) transmission mode for PUCCH transmission can be set by RRC signaling. Also, the antenna (port) transmission mode can be set independently for each PUCCH format.

  Hereinafter, the present invention proposes various methods for a resource allocation method (see FIG. 33, step S3310) in an environment in which multiple resources are used for multiple antenna (port) transmission in PUCCH format 3. For example, when 2Tx SORTD is applied to PUCCH format 3, two orthogonal resources are required, so an allocation rule for two orthogonal resources is required.

  Specifically, when a PUCCH resource for A / N is preliminarily allocated by RRC, a resource used for actual PUCCH transmission can be determined as follows.

  -The PDCCH corresponding to the PDSCH on the SCell (s) (or the PDCCH on the SCell (s) corresponding to the PDSCH) uses one of the PUCCH resources configured by the RRC as an ARI (ie, HARQ-ACK). Resource value).

-If PDCCH corresponding to PDSCH on SCell (s) (or PDCCH on SCell (s) corresponding to PDSCH) is not detected and PDSCH is received on PCell, apply one of the following be able to:
An implicit A / N PUCCH resource based on the existing 3GPP Rel-8 (that is, a PUCCH format 1a / 1b resource obtained by using the minimum CCE constituting the PDCCH) is used.
-PDCCH corresponding to PDSCH on PCell (or PDCCH on PCell corresponding to PDSCH) indicates one of resources configured by RRC using ARI (that is, HARQ-ACK resource value). To do.
-The terminal assumes that the PDCCH corresponding to the PDSCH on the SCells (or the PDCCH on the SCell (s) corresponding to the PDSCH) all have the same ARI (ie, HARQ-ACK resource value).

  The ARI (that is, the HARQ-ACK resource value) may be X bits, and X = 2 when reusing the TPC field of the SCell PDCCH. For convenience, X = 2.

  Hereinafter, a resource allocation method for supporting various antenna (port) transmission modes when transmitting control information using PUCCH format 3 will be described.

  Here, HARQ-ACK represents a HARQ ACK / NACK / DTX response to the downlink transport block. The HARQ ACK / NACK / DTX response includes ACK, NACK, DTX, and NACK / DTX.

  If the ARI (that is, the HARQ-ACK resource value) is transmitted using the TPC field of the SCell PDCCH, when the terminal receives the PDSCH only on the PCell (or receives the PDCCH only on the PCell), the ARI, In addition, there is a problem that the PUCCH resource value related to the ARI cannot be grasped. Therefore, when the event occurs, a fall-back may be applied using the existing 3GPP Rel-8 / 9 PUCCH resource and Rel-8 / 9 PUCCH format 1a / 1b.

  Next, a method for allocating multiple orthogonal resources for transmit diversity (eg, SORTD) is described. For convenience, assume that two orthogonal resources are used.

  In the following description, resources (sets) further required for multi-antenna port transmission may be allocated in consideration of the terminal capability or in consideration of the actual transmission mode of the terminal. For example, if the terminal supports multi-antenna port transmission, the base station gives the terminal a first resource (set) for single antenna port transmission and a second resource (set for multi-antenna port transmission). ) Can be assigned in advance. Thereafter, the terminal uses the first resource (set) when operating in the single antenna port transmission mode, and the first resource (set) and the second resource when operating in the multiple antenna port transmission mode. (Set) can be used. Further, the base station may allocate a second resource (set) for multi-antenna port transmission in consideration of the current transmission mode of the terminal. For example, the base station can allocate a second resource (set) for the terminal after instructing the terminal to operate in the multi-antenna port transmission mode. That is, the terminal is further allocated the second resource (set) only after the terminal is set to the multi-antenna port transmission mode in the state where the first resource (set) is allocated.

  For example, the terminal basically receives allocation information indicating a plurality of PUCCH resources for the antenna port p0, and can perform multi-antenna port transmission or only when a multi-antenna port transmission mode is set. And allocation information indicating a plurality of PUCCH resources for antenna port p1 can be further received.

  In the multi-antenna port transmission mode, one ARI is used to indicate a plurality of PUCCH resource values. Each of the plurality of PUCCH resource values indicated by the ARI is mapped to the PUCCH resource for the corresponding antenna port. Therefore, the ARI can indicate one or a plurality of PUCCH resource values depending on whether the antenna port transmission mode is a single antenna port mode or a multiple antenna port mode. Table 17 illustrates the above-described method.

  Although not limited to this, as described above, the terminal basically receives allocation information indicating a plurality of PUCCH resources for the antenna port p0, and is capable of multi-antenna port transmission, or Only when the multi-antenna port transmission mode is set, assignment information indicating a plurality of PUCCH resources for the antenna port p1 can be further received.

  Tables 17 to 19 exemplify a case where the p = p0 portion is configured the same as the case of the single antenna port in the allocation of the PUCCH resource values for the multiple antenna ports. That is, Tables 17-19 assume a nested structure. Therefore, both single / multiple antenna port transmissions can be supported by one common table.

  With reference to Table 18, it demonstrates more concretely about a nested structure. A nested table can use one common table. Table 20 illustrates a common table for single / multiple antenna port transmission modes.

  As another aspect of the present invention, a method using a DAI (Downlink Assignment Index) field in the case of TDD CA will be described. The DAI is a value for counting the scheduled PDCCH in the time domain, and can be extended to the cell (or CC) domain in the CA. PUCCH format 3 does not require a DAI value, and DAI can be utilized for the application of the present invention.

  As an example, the PUCCH format 3 resource for the first antenna port (p = p0) is allocated / determined using ARI, and the PUCCH format 3 resource for the second antenna port (p = p1) is DAI. Can be assigned / determined. In case the PDCCH detection of at least one serving cell fails, all of the serving cell's PDCCHs can be restricted to have a DAI value. On the other hand, when the PDSCH is scheduled only in the PCell, the terminal may ignore the DAI value of the PCell PDCCH corresponding to the PDSCH, fall back to the single antenna port mode, and transmit the PUCCH.

Table 25 illustrates the above-described method.

  FIG. 34 is a diagram illustrating a base station and a terminal that can be applied to an embodiment of the present invention. When the wireless communication system includes a relay, communication is performed between the base station and the relay through the backhaul link, and communication is performed between the relay and the terminal through the access link. Therefore, the base station or terminal in the figure may be replaced with a relay depending on the situation.

  Referring to FIG. 34, the wireless communication system includes a base station (BS) 110 and a terminal (UE) 120. The base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116. The processor 112 may be configured to implement the procedures and / or methods proposed in the present invention. The memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112. The RF unit 116 is connected to the processor 112 and transmits and / or receives wireless signals. The terminal 120 includes a processor 122, a memory 124, and an RF unit 126. The processor 122 may be configured to implement the procedures and / or methods proposed in the present invention. The memory 124 is connected to the processor 122 and stores various information related to the operation of the processor 122. The RF unit 126 is connected to the processor 122 and transmits and / or receives a radio signal. Base station 110 and / or terminal 110 may have a single antenna or multiple antennas.

  In the embodiment described above, the constituent elements and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features, or some components and / or features may be combined to form an embodiment of the present invention. The order of operations described in the embodiments of the present invention can be changed. Some configurations or features of one embodiment may be included in another embodiment or may replace a corresponding configuration or feature of another embodiment. It is obvious that claims which are not explicitly cited in the claims can be combined to constitute an embodiment, or can be included as new claims by amendment after application.

  In this document, embodiments of the present invention are described with a focus on the data transmission / reception relationship between the terminal and the base station. Such a transmission / reception relationship is extended in the same / similar manner to signal transmission / reception between the terminal and the relay or between the base station and the relay. The specific operation assumed to be performed by the base station in this document may be performed by its upper node in some cases. That is, it is clear that various operations performed for communication with a terminal in a network including a large number of network nodes including a base station can be executed by the base station or another network node other than the base station. . The base station may be replaced with terms such as a fixed station, Node B, eNode B (eNB), access point, and the like. The terminal can be replaced with terms such as UE (User Equipment), MS (Mobile Station), and MSS (Mobile Subscriber Station).

  Embodiments according to the present invention may be implemented by various means such as hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, one embodiment of the present invention includes one or more ASICs (application specific integrated circuits), DSPs (digital signal processing), DSPDs (digital signal processing), DSPs (digital signal processing). , FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, microprocessors, and the like.

  In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, or the like that performs the functions or operations described above. The software code can be stored in a memory unit and driven by a processor. The memory unit is provided inside or outside the processor, and can exchange data with the processor by various known means.

  It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be construed as limiting in any way, and should be considered exemplary. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes that come within the equivalent scope of the invention are included in the scope of the invention.

  The present invention is applicable to a terminal, a base station, or other equipment in a wireless mobile communication system. In particular, the present invention is applicable to a method and apparatus for transmitting uplink control information.

Claims (4)

A method in which a communication apparatus transmits control information using PUCCH format 3 in a wireless communication system,
Receiving an RRC message including a first set of four PUCCH resource values for the PUCCH format 3;
Detecting one PDCCH signal;
Receiving one PDSCH signal corresponding to the PDCCH signal on the SCell;
Determining one or more PUCCH resources based on a 2-bit value of a TPC field of the PDCCH signal;
Have
When single antenna port transmission mode is configured for PUCCH format 3 transmission , the RRC message does not have a further set of 4 PUCCH resource values for the PUCCH format 3 and the 2 bits of the TPC field. The value is mapped to one of the first set of four PUCCH resource values for the first antenna port;
When a multi-antenna port transmission mode is configured for the PUCCH format 3 transmission , the RRC message further comprises a second set of four PUCCH resource values, and the 2-bit value of the TPC field is For the first antenna port, it is mapped to one of the first set of four PUCCH resource values, and for the second antenna port, one of the second set of four PUCCH resource values. Mapped to one method. Further comprising transmitting the control information using the one or more determined PUCCH resources;
The method according to claim 1, wherein the control information includes HARQ-ACK for the PDSCH signal. A communication device configured to transmit control information using PUCCH format 3 in a wireless communication system,
A radio frequency unit;
And a processor,
The processor receives an RRC message including a first set of four PUCCH resource values for the PUCCH format 3, detects one PDCCH signal, and receives one PDSCH signal corresponding to the PDCCH signal on the SCell And one or more PUCCH resources are determined based on a 2-bit value of a TPC field of the PDCCH signal,
When single antenna port transmission mode is configured for PUCCH format 3 transmission , the RRC message does not have a further set of 4 PUCCH resource values for the PUCCH format 3 and the 2 bits of the TPC field. The value is mapped to one of the first set of four PUCCH resource values for the first antenna port;
When a multi-antenna port transmission mode is configured for the PUCCH format 3 transmission , the RRC message further comprises a second set of four PUCCH resource values, and the 2-bit value of the TPC field is For the first antenna port, it is mapped to one of the first set of four PUCCH resource values, and for the second antenna port, one of the second set of four PUCCH resource values. Communication device mapped to one. The processor is further configured to transmit the control information using the one or more determined PUCCH resources;
The communication apparatus according to claim 3, wherein the control information includes HARQ-ACK for the PDSCH signal.

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