CN106130698B - Method and apparatus for transmitting/receiving uplink control information in wireless communication system - Google Patents

Abstract

method of transmitting ACK/NACK information includes determining a PUCCH format and a PUCCH resource by which the ACK/NACK information is to be transmitted, and transmitting the ACK/NACK information using PUCCH format 1a/1b and the PUCCH resource, wherein serving cells are configured for the UE, and wherein the ACK/NACK information is transmitted by using the PUCCH format 1a/1b when the ACK/NACK information corresponds to only Physical Downlink Shared Channels (PDSCHs) indicated by detection of a corresponding Physical Downlink Control Channel (PDCCH) having a downlink assignment index DAI value of 1, or corresponds to only a semi-persistent scheduling (SPS) release PDCCH having a DAI value of 1.

Description

Method and apparatus for transmitting/receiving uplink control information in wireless communication system

The invention relates to a divisional application of a patent application, which is filed on 28.6.2013, has an international application date of 2011, 11.2.2011 and an application number of 201180063475.X (PCT/KR2011/008294), and is named as a method and a device for transmitting/receiving uplink control information in a wireless communication system.

Technical Field

The present invention relates to a radio communication system, and more particularly, to a method and apparatus for transmitting and receiving uplink control information.

Background

In general, wireless communication systems are multiple-access systems capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.) multiple-access systems include, for example, Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and multi-carrier frequency division multiple access (MC-FDMA) systems.

Disclosure of Invention

[ problem ] to provide a method for producing a semiconductor device

objects of the present invention are to provide methods for efficiently transmitting control information in a wireless communication system and apparatuses therefor, another object of the present invention is to provide channel formats and signal processing methods for efficiently transmitting control information and apparatuses therefor, and yet another object of the present invention is to provide methods for efficiently allocating resources for control information transmission.

It will be apparent to those skilled in the art that the technical objects that can be achieved by the present invention are not limited to what has been particularly described above, and other technical objects of the present invention will become more clearly apparent from the following detailed description.

[ technical solution ] A method for producing a semiconductor device

The object of the present invention can be achieved by providing methods for transmitting acknowledgement/negative acknowledgement (ACK/NACK) information at a User Equipment (UE) in a wireless communication system, the method including determining a Physical Uplink Control Channel (PUCCH) format and resources by which ACK/NACK information for downlink transmission in a downlink frame set including M (M ≧ 1) downlink subframes is to be transmitted, and transmitting the ACK/NACK information using the PUCCH format and resources in uplink subframes, wherein serving cells are configured for the UE, the determining includes determining use of a PUCCH format 1a/1b when a semi-persistent scheduling (SPS) release PDCCH is not present in the downlink subframe set and Physical Downlink Shared Channels (PDSCHs) indicated by detection of a corresponding PDCCH having a Downlink Assignment Index (DAI) of 1 are present in the downlink subframe set, and the transmitting includes transmitting the ACK/NACK information using the PUCCH format 1a/1 b.

In another aspects of the present invention, there is provided User Equipment (UE) for transmitting acknowledgement/negative acknowledgement (ACK/NACK) information in a wireless communication system, comprising a receiving module for receiving a downlink signal from a Base Station (BS), a transmitting module for transmitting an uplink signal to the BS, and a processor for controlling the UE including the receiving module and the transmitting module, wherein the processor is configured to determine a Physical Uplink Control Channel (PUCCH) format and resources through which ACK/NACK information for downlink transmission in a downlink frame set including M (M ≧ 1) downlink subframes is to be transmitted, and to transmit the ACK/NACK information using the PUCCH format and resources in uplink subframes, wherein serving cells are configured for the UE, the ACK/NACK information is transmitted using a shared physical channel (PDSCH) 1 a/B when there are no semi-persistent scheduling (SPS) release PDCCH in the downlink subframe set and there are shared physical downlink channel (PDSCH a) information indicated by detection of a corresponding PDCCH having a Downlink Assignment Index (DAI) of PUCCH1 in the downlink subframe set, and the ACK/NACK information is transmitted using a shared physical channel a shared channel a 1 b.

The following may be commonly applied to the above embodiments of the present invention.

The determining may include determining use of PUCCH format 1a/1b when there is no PDSCH indicated by detection of a corresponding PDCCH in the downlink subframe set and SPS release PDCCHs having a DAI value of 1 in the downlink subframe set, and the transmitting may include transmitting ACK/NACK information using PUCCH format 1a/1 b.

The resource index of the PUCCH format 1a/1b may be derived from a Control Channel Element (CCE) index of the PDCCH.

The determining may include determining use of PUCCH format 1a/1b when there is no PDSCH indicated by detection of a corresponding PDCCH in the downlink subframe set, there is no SPS release PDCCH in the downlink subframe, and there are PDSCHs in which the corresponding PDCCH is not detected only on the PCell in the downlink subframe set, and the transmitting may include transmitting ACK/NACK information using PUCCH format 1a/1 b.

The resource index of the PUCCH format 1a/1b may be determined by a value of a Transmit Power Control (TPC) field of a PDCCH indicating SPS activation for PDSCHs in which the corresponding PDCCH is not detected.

When there are or more PDSCHs indicated by detection of a PDCCH having a DAI value greater than 1 in the downlink subframe set or an SPS release PDCCH having a DAI value greater than 1 in the downlink subframe set, the ACK/NACK information may be transmitted using PUCCH format 3.

The resource index of PUCCH format 3 may be determined by a value of a TPC field of a PDCCH having a DAI value greater than 1, and the PDCCH having a DAI value greater than 1 may be or both of a PDCCH indicating PDSCH transmission and a PDCCH indicating SPS release.

The UE may assume that the same PUCCH resource index value is transmitted in a PDCCH indicating a resource index of PUCCH format 3 in a downlink subframe set, and the PDCCH indicating a resource index of PUCCH format 3 may be or both of a PDCCH indicating PDSCH transmission and a PDCCH indicating SPS release.

The TPC field of the PDCCH having a DAI value of 1 may indicate uplink TPC information, and the PDCCH having a DAI value of 1 may be or both of the PDCCH indicating PDSCH transmission and the PDCCH indicating SPS release.

The wireless communication system may be a Time Division Duplex (TDD) wireless communication system.

The foregoing general description and the following detailed description of the invention are exemplary only, and are given as further description of the invention, which is defined by the appended claims.

[ PROBLEMS ] the present invention

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

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention at , illustrate embodiments of the invention and together with the description serve to explain the principles of the invention:

fig. 1 is a block diagram illustrating constituent elements of a UE and a BS performing the present invention;

fig. 2 illustrates an exemplary structure of transmitters in each of the UE and the BS;

fig. 3 illustrates an example of mapping input symbols to subcarriers in the frequency domain while satisfying a single carrier property;

fig. 4 to 6 illustrate examples of mapping input symbols to a single carrier by clustered DFT-s-OFDM;

figure 7 illustrates signal processing operations in segmented SC-FDMA;

fig. 8 illustrates an exemplary radio frame structure for use in a wireless communication system;

fig. 9 illustrates an exemplary DL/UL slot structure in a wireless communication system;

fig. 10 illustrates an exemplary DL subframe structure in a wireless communication system;

fig. 11 illustrates an exemplary UL subframe structure in a wireless communication system;

fig. 12 illustrates an example of determining PUCCH resources for ACK/NACK;

fig. 13 illustrates exemplary communication in a single carrier case;

fig. 14 illustrates exemplary communication in a multi-carrier case;

fig. 15 illustrates a concept that MAC layers manage multiple carriers in a BS;

fig. 16 illustrates the concept of MAC layers managing multiple carriers in a UE;

fig. 17 illustrates a concept in which a plurality of MAC layers manage a plurality of carriers in a BS;

fig. 18 illustrates a concept in which a plurality of MAC layers manage a plurality of carriers in a UE;

fig. 19 illustrates another concepts of multiple MAC layers managing multiple carriers in a BS;

fig. 20 illustrates another concepts of multiple MAC layers managing multiple carriers in a UE;

fig. 21 and 22 illustrate slot level structures of PUCCH formats 1a and 1b for ACK/NACK transmission;

fig. 23 illustrates a case of transmitting UCI in a wireless communication system supporting CA;

fig. 24 to 27 illustrate a PUCCH format structure for feeding back a plurality of ACK/NACK bits and a signal processing operation thereof;

fig. 28 is a flowchart illustrating a predefined resource allocation for PUCCH resource determination in a PCell-only reception case;

fig. 29 is a flowchart illustrating an additional predefined resource allocation for PUCCH resource determination in a PCell-only reception case;

fig. 30 is a flowchart illustrating an example of using a DAI field as an ARI for PUCCH resource determination in a PCell-only reception case;

fig. 31 is a flowchart illustrating an example of using a TPC field as an ARI for PUCCH resource determination in a PCell-only reception case;

fig. 32 is a flowchart illustrating another examples of using the TPC field as an ARI for PUCCH resource determination in a PCell-only reception case;

fig. 33 is a diagram illustrating an embodiment of using a TPC field for an original purpose or ARI purpose according to a DAI value on a PCell;

fig. 34 is a diagram illustrating an example of increasing DAI values in ascending order of CC indexes in a bundling window;

fig. 35 is a diagram illustrating an example of determining a DAI value in a CA TDD system;

fig. 36 to 39 illustrate various examples of using a DAI field in CC domain bundling;

FIG. 40 is a diagram illustrating an exemplary time-domain partial bundling;

fig. 41 is a diagram illustrating channel selection using PUCCH format 1b in CC domain bundling;

fig. 42 is a diagram illustrating channel selection using PUCCH format 3 in CC domain bundling;

fig. 43 is a diagram illustrating an example of use of DAI and TPC;

fig. 44 is a diagram illustrating another examples of the use of DAI and TPC;

fig. 45 is a diagram illustrating an example of the present invention for use of a TPC field in a PDCCH; and

fig. 46 is an overall flowchart illustrating an ACK/NACK transmission method for various DL transmissions according to an example of the present invention.

Detailed Description

The embodiments of the invention described below are combinations of elements and features of the invention in their predetermined forms the elements or features may be considered optional unless otherwise specified elements or features may be practiced without being combined with other elements or features and embodiments of the invention may be constructed by combining parts of the elements and/or features the order of operations described in embodiments of the invention may be rearranged the configurations of any embodiments may be included in another embodiments and may be replaced with corresponding configurations of another embodiments.

In embodiments of the present invention, an explanation is given of a data transmission and reception relationship between a Base Station (BS) and a terminal.A BS herein refers to a terminal node of a network that directly communicates with the terminal.A specific operation described as being performed by the BS may be performed by an upper node of the BS in cases .

In other words, it is apparent that, in a network configured by a plurality of network nodes including the BS, various operations performed for communication with the terminal may be performed by the BS or network nodes other than the BS. The term "BS" may be replaced by terms such as fixed station, node B, e node b (enb), Access Point (AP), etc. Also herein, the term BS may be used as a concept including a cell or a sector. Meanwhile, the "relay" may be replaced with terms such as a Relay Node (RN), a Relay Station (RS), and the like. The term "terminal" may be replaced with terms such as User Equipment (UE), Mobile Station (MS), mobile subscriber station (MSs), Subscriber Station (SS), and the like.

Specific terms disclosed in the present invention are proposed to help understanding of the present invention, and the use of these specific terms may be changed to another formats within the technical scope or spirit of the present invention.

At , well-known structures and devices may be omitted to avoid obscuring the concepts of the invention, and important functions of the structures and devices may be shown in block diagram form.

Embodiments of the present invention can be supported by at least standard documents disclosed in wireless access systems including an Institute of Electrical and Electronics Engineers (IEEE)802 system, a third generation partnership project (3GPP) system, a 3GPP Long Term Evolution (LTE) system, a 3GPP LTE-advanced (LTE-a) system, and a 3GPP2 system.

The following techniques can be used for a variety of radio access systems, such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be embodied by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000 TDMA may be embodied by radio technologies such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE)802.11(Wi-Fi), IEEE802.16(WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). 3GPP LTE is part of Universal Mobile Telecommunications System (UMTS). 3GPP LTE is an evolved- UMTS that uses E-LTE.16 e.can use OFDMA in the downlink, and is a version of 3GPP LTE is a 3GPP LTE-wireless evolution 802.16E (OFDMA), and OFDMA systems are expressly described for purposes of the present invention by way of the following description and 3GPP LTE-LTE systems.

Fig. 1 is a block diagram illustrating constituent elements of a UE and a BS performing the present invention.

The UE operates as a transmitter on the uplink and as a receiver on the downlink. In contrast, a BS operates as a receiver on the uplink and as a transmitter on the downlink.

The UE and the BS include antennas 500a and 500b for receiving information, data, signals and/or messages, transmitters 100a and 100b for transmitting messages by controlling the antennas, receivers 300a and 300b for receiving messages by controlling the antennas, and memories 200a and 200b for storing various types of information related to communications in the wireless communication system, the UE and the BS further include processors 400a and 400b operatively connected to constituent elements of the transmitters, receivers and memories included in the UE or the BS for performing the present invention by controlling the constituent elements, the transmitter 100a, the receiver 300a, the memory 200a and the processor 400a of the UE may be configured as independent components by separate chips, or two or more thereof may be integrated into chips, the transmitter 100b, the receiver 300b, the memory 200b and the processor 400b of the BS may be configured as independent components by separate chips, or two or more thereof may be integrated into chips.

The antennas 500a and 500b transmit signals generated from the transmitters 100a and 100b to the outside or receive signals from the outside and provide the received signals to the receivers 300a and 300b the antennas 500a and 500b are also referred to as antenna ports every antenna ports may correspond to physical antennas or may be configured by a combination of more than physical antenna elements the signals transmitted through every antenna ports cannot be re-decomposed by the receiving apparatus 20 the Reference Signals (RS) transmitted corresponding to the antenna ports define the antenna ports as viewed from the UE and enable the UE to perform channel estimation for the antenna ports regardless of whether the channel is a single radio channel from physical channels or a composite channel from multiple physical antenna elements including the antenna ports, i.e. the antenna ports are defined such that the channel transmitting symbols on the antenna port can be derived from the channel transmitting another symbols through the same antenna port if the transmitter and receiver support multiple input of the transmitter and receiver () where multiple antennas are used to transmit and receive data.

In general, the processors 400a and 400b control overall operations of modules of the UE or BS, and in particular, the processors 400a and 400b may perform various control functions for implementing the present invention, a Media Access Control (MAC) frame conversion control function based on service characteristics and a propagation environment, a power saving mode function for controlling an idle mode operation, a switching function, an authentication and encryption function, and the like, and the processors 400a and 400b may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer, and meanwhile, the processors 400a and 400b may be configured as hardware, firmware, software, or a combination of hardware, firmware, and software, in a hardware configuration, the processors 400a and 400b may include an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a digital signal processing device (pd), a Programmable Logic Device (PLD), a field programmable array (FPGA), and the like, which are configured to implement the present invention.

The transmitters 100a and 100b encode and modulate signals and/or data scheduled by the processors 400a and 400b or by schedulers connected to the processors and transmitted to the outside, and transmit the modulated signals and/or data to the antennas 500a and 500 b. For example, the transmitters 100a and 100b convert data streams to be transmitted into K layers through demultiplexing, channel coding, and modulation. The K layers are transmitted by antennas 500a and 500b via the transmitter's transmit processor. The transmitters 100a and 100b and the receivers 300a and 300b of the UE and the BS may be differently configured according to an operation of processing a transmission signal and a reception signal.

The memories 200a and 200b may store programs for processing and control in the processors 400a and 400b, and may temporarily store input and output information. The memories 200a and 200b may serve as buffers. The memories 200a and 200b may be configured using a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (e.g., a Secure Digital (SD) or ultra digital (XD) memory), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic memory, a magnetic disk, an optical disk, and the like.

Fig. 2 illustrates an exemplary structure of transmitters in each of the UE and the BS, the operation of the transmitters 100a and 100b is described in more detail below with reference to fig. 2.

Referring to fig. 2, each of the transmitters 100a and 100b includes a scrambler 301, a modulation mapper 302, a layer mapper 303, a precoder 304, a Resource Element (RE) mapper 305, and an Orthogonal Frequency Division Multiplexing (OFDM) signal generator 306.

The transmitters 100a and 100b may transmit more than codewords the scrambler 301 scrambles the coded bits of each codewords for transmission on a physical channel.

The modulation mapper 302 modulates the scrambled bits into complex-valued modulation symbols. The modulation mapper 302 may modulate the scrambled bits into complex-valued modulation symbols representing positions on a signal constellation according to a predetermined modulation scheme. The modulation scheme is not limited, and m-phase shift keying (m-PSK) and m-quadrature amplitude modulation (m-QAM) may be used to modulate the encoded data.

The layer mapper 303 maps the complex-valued modulation symbols to or more transmission layers.

The layer mapper 303 may precode the complex modulation symbols on every layers for transmission through the antenna ports more specifically, the precoder 304 processes the complex modulation symbols for the plurality of transmit antennas 500-1 to 500-N in a MIMO scheme_tModulates the symbols to produce antenna-specific symbols and distributes the antenna-specific symbols to the RE mappers 305. That is, the precoder 304 maps the transmission layers to antenna ports. The precoder 304 may multiply the output x of the layer mapper 303 by N_t×M_tPrecoding a matrix W and N_t×M_FThe matrix z is formed to output the resulting product.

The RE mapper 305 maps/assigns the complex-valued modulation symbols for the corresponding antenna ports to REs. The RE mapper 305 may allocate complex-valued modulation symbols for respective antenna ports to appropriate subcarriers and may multiplex them according to the UE.

The OFDM signal generator 306 modulates the complex-valued modulation symbols, i.e., antenna-specific symbols, for the respective antenna ports through OFDM or single-carrier frequency division multiplexing (SC-FDM), thereby generating complex-valued time domain OFDM or SC-FDM symbol signals. OFDM signal generator 306 may perform an Inverse Fast Fourier Transform (IFFT) on the antenna-specific symbols and insert a Cyclic Prefix (CP) into the resulting IFFT time-domain symbols. OFDM symbol digital-to-analog conversion, frequency up-conversionAfter waiting through the transmitting antennas 500-1 to 500-N_tIs transmitted to the receiver. The OFDM signal generator 306 may include an IFFT module, a CP inserter, a digital-to-analog converter (DAC), a frequency up-converter, and the like.

Meanwhile, if the transmitters 100a and 100b employ SC-FDMA for transmission of codewords, the transmitters 100a and 100b may include a Discrete Fourier (DFT) module 307 (or a Fast Fourier Transform (FFT) module). The DFT module performs DFT or FFT on the antenna-specific symbols and outputs DFT/FFT symbols to the RE mapper 305. SC-FDMA is a transmission scheme for transmitting a signal by reducing a peak-to-average power ratio (PAPR) or Cubic Metric (CM) of the signal. According to SC-FDMA, a signal can be transmitted without passing through a nonlinear distortion region of a power amplifier. Therefore, even when the transmitter transmits a signal at a power lower than that in the conventional OFDM scheme, the receiver can receive a signal satisfying a constant strength or error rate. That is, the power consumption of the transmitter can be reduced by SC-FDMA.

In a conventional OFDM signal generator, signals carried on every carriers are simultaneously transmitted in parallel to each other by multi-carrier modulation (MCM) while passing through IFFT, thereby reducing the efficiency of a power amplifier, in addition , in SC-FDMA, information is DFT/FFT before the signals are mapped to subcarriers, the PAPR is increased by the DFT/FFT-processed signals having been increased by the DFT/FFT effect by the DFT module 307, the DFT/FFT-processed signals are mapped to subcarriers, IFFT-processed, and converted into time domain signals, that is, the SC-FDMA transmitter performs a DFT or FFT operation steps before the OFDM signal generator so that the PAPR of the transmitted signal is increased at the IFFT input stage and is finally decreased while passing through IFFT times more.

Fig. 3 illustrates an example of mapping input symbols to subcarriers in a frequency domain while satisfying a single carrier property, if DFT symbols are allocated to subcarriers according to among the schemes illustrated in fig. 3(a) and 3(b), a transmission signal satisfying a single carrier property may be obtained, fig. 3(a) illustrates centralized mapping, and fig. 3(b) illustrates distributed mapping.

Meanwhile, the transmitters 100a and 100b may employ clustered DFT spread OFDM (DFT-s-OFDM). Clustered DFT-s-OFDM is a modified version of conventional SC-FDMA. In the clustered DFT-s-OFDM, a signal passing through the DFT/FFT module 307 and the precoder 304 is divided into a predetermined number of sub-blocks and mapped to subcarriers in a discontinuous manner. Fig. 4 to 6 illustrate examples of mapping input symbols to a single carrier by clustered DFT-s-OFDM.

Fig. 4 illustrates signal processing operations for mapping DFT-processed output samples to single carriers in clustered SC-FDMA. Fig. 5 and 6 illustrate signal processing operations for mapping DFT-processed output samples to multiple carriers in clustered SC-FDMA. Figure 4 illustrates the application of intra-carrier clustered SC-FDMA, while figures 5 and 6 illustrate the application of inter-carrier clustered SC-FDMA. Fig. 5 illustrates signal generation by a single IFFT block in the following case: the subcarrier spacing between consecutive component subcarriers is aligned in the case where the component carriers are allocated consecutively in the frequency domain. Fig. 6 illustrates signal generation by a plurality of IFFT blocks in the case where component carriers are discontinuously allocated in the frequency domain.

Fig. 7 illustrates signal processing operations in segmented SC-FDMA.

Since the number of DFT blocks is equal to the number of IFFT blocks and thus the DFT blocks and IFFT blocks correspond to , segmented SC-FDMA is a simple extension of the DFT-spread and IFFT subcarrier mapping structure of conventional SC-FDMA and can be expressed as NxSC-FDMA or NxDFT-s-ofdma in the present disclosure, the segmented SC-FDMA includes all of these items, see fig. 7, in the segmented SC-FDMA, all modulation symbols in the time domain are divided into N groups (where N is an integer greater than 1), and DFT processing is performed in units of groups in order to release the single carrier property constraint.

Referring back to fig. 2, the receivers 300a and 300b operate in a reverse order of the operation of the transmitters 100a and 100b, the receivers 300a and 300b decode and demodulate radio signals received from the outside through the antennas 500a and 500b, and transmit the demodulated signals to the processors 400a and 400b, the antennas 500a and 500b connected to each of the receivers 300a and 300b may include N_rA receiving antenna. By each time signals received by the reception antennas are restored to baseband signals and then restored to original data streams transmitted by the transmitters 100a and 100b through multiplexing and MIMO demodulation Each of the receivers 300a and 300b may include a signal restorer for restoring the received signals to baseband signals, a multiplexer for multiplexing the received and processed signals, and a channel demodulator for demodulating the multiplexed signal streams into codewords.

Meanwhile, if the receivers 300a and 300b receive the signals transmitted through SC-FDMA as described with reference to fig. 3 to 7, the receivers 300a and 300b include an IFFT module every further steps the IDFT/IFFT module IDFT/IFFT processes the antenna-specific symbols recovered by the RE demapper and outputs the IDT/IFFT symbols to the multiplexer.

Although it has been described in fig. 1 to 7 that each of the transmitters 100a and 100b includes the scrambler 301, the modulation mapper 302, the layer mapper 303, the precoder 304, the RE mapper 305, and the OFDM signal generator 306, it may be further to consider that the scrambler 301, the modulation mapper 302, the layer mapper 303, the precoder 304, the RE mapper 305, and the OFDM signal generator 306 are included in each of the processors 400a and 400b of the transmitters 100a and 100b, also, although it has been described in fig. 1 to 7 that each of the receivers 300a and 300b includes the signal recoverer, the multiplexer, and the channel demodulator, it may be further to consider that the signal recoverer, the multiplexer, and the channel demodulator are included in each 592 of the processors 400a and 400b of the receivers 300a and 300b, for convenience of explanation, the following is given on the premise that the scrambler 301, the modulation mapper 302, the layer mapper 303, the RE mapper 304, the RE mapper 305, and the OFDM signal generator 306 (under the condition that the transmitter 300a and the OFDM signal generator 306 b are included in the case that the OFDM signal processing module 400a and the OFDM signal generator 300a is configured to be operated in the case that the FDMA mapper 301, the FDMA mapper 301 and the FDMA mapper 306 a, the FDMA mapper 306 and the FDMA mapper 306 are included in the case that the FDMA processing module 300a, the FDMA processing module 300a processing module 300b, the FDMA processing module 300b is applied in the case that the FDMA processing module 300a processing module is applied in the case that the FDMA processing module 300a processing module 300b, the FDMA processing module 300a, the FDMA processing module 300b, the FDMA processing module is applied in the case that the FDMA processing module 300a processing module 300b, the FDMA processing module is included in the FDMA processing module 300a processing module 300b, the FDMA.

Fig. 8 illustrates an exemplary radio frame structure used in a wireless communication system. Specifically, fig. 8(a) illustrates a radio frame of frame structure type 1(FS-1) in the 3GPP LTE/LTE-a system, and fig. 8(b) illustrates a radio frame of frame structure type 2(FS-2) in the 3GPP LTE/LTE-a system. The frame structure of fig. 8(a) may be applied to a Frequency Division Duplex (FDD) mode and a half FDD (H-FDD) mode, and the frame structure of fig. 8(b) may be applied to a Time Division Duplex (TDD) mode.

Referring to fig. 8, in 3GPP LTE/LTE-a, a radio frame has a length of 10ms (307200Ts), including 10 equally sized subframes. The 10 subframes of a radio frame may be numbered. Here, T_sIs the sampling time, expressed as T_sThe time required to transmit subframes is defined as the Transmission Time Interval (TTI) — the time resources can be identified by radio frame number (or radio frame index), subframe number (or subframe index) or slot number (or slot index).

Different radio frames may be configured according to the duplex mode. For example, in the FDD mode, since downlink transmission and uplink transmission are distinguished by frequency, a radio frame includes a downlink subframe or an uplink subframe.

In another aspect , in the TDD mode, because downlink transmission and uplink transmission are distinguished by time, subframes in a frame are divided into downlink subframes and uplink subframes, and table 1 shows an exemplary uplink-downlink configuration in the TDD mode.

[ Table 1]

In table 1, D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe. The special subframe includes three fields of a downlink pilot time slot (DwPTS), a Guard Period (GP), and an uplink pilot time slot (UpPTS). DwPTS is a time slot reserved for downlink transmission and UpPTS is a time slot reserved for uplink transmission.

Fig. 9 illustrates an exemplary downlink/uplink (DL/UL) slot structure in a wireless communication system fig. 9, in particular, illustrates a structure of a resource grid of a 3GPP LTE/LTE-a system, there are resource grids per antenna ports.

Referring to fig. 9, a slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain and includes a plurality of Resource Blocks (RBs) in a frequency domain, the OFDM symbols may represent symbol durations.a RB includes a plurality of subcarriers in the frequency domain.a OFDM symbol may be referred to as an OFDM symbol, an SC-FDM symbol, etc. the number of OFDM symbols per slots may vary depending on a channel bandwidth and a Cyclic Prefix (CP) length.e. slots include 7 OFDM symbols in the case of a normal CP and slots include 6 OFDM symbols in the case of an extended CP.

Referring to fig. 9, N may be included by^DL/UL _RBN^RB _scSub-carriers and N^DL/UL _symbResource grid of OFDM or SC-FDM symbols to describe the signal transmitted in every slots^DL _RBIndicates the number of RBs in the DL slot, and N^UL _RBIndicating the number of RBs in the UL slot. N is a radical of^DL _RBAnd N^UL _RBComprising N in the frequency domain every OFDM symbols^DL/UL _RBN^RB _scThe type of subcarriers may be divided into data subcarriers for data transmission, RS subcarriers for RS transmission, and null subcarriers for guard band and DC component₀. This carrier frequency is also referred to as the center frequency. N is a radical of^DL _symbIndicates the number of OFDM or SC-FDMA symbols in a DL slot, N^UL _symbDenotes the number of OFDM or SC-FDMA symbols in the UL slot, and N^RB _scIndicating the number of subcarriers constituting RBs.

In other words, a Physical Resource Block (PRB) is defined as N in the time domain^DL/UL _symbMultiplying a number of consecutive OFDM symbols or SC-FDMA symbols by N in the frequency domain^RB _scThus, PRBs comprise N^DL/UL _symb×N^RB _scAnd (4) RE.

Each RE in the resource grid may be identified by unique to the index pair (k, l) in the time slot k ranges from 0 to N^DL/UL _RB×N^RB _sc-a frequency domain index of 1, and l is a number ranging from 0 to N^DL/UL _symb-a time domain index of 1.

Fig. 10 illustrates an exemplary DL subframe structure in a wireless communication system.

Referring to fig. 10, each subframes may be divided into a control region and a data region, the control region includes or more OFDM symbols starting from a th OFDM symbol, the number of OFDM symbols used in the control region in a subframe may be independently configured in every subframes, information on the number of OFDM symbols is transmitted through a Physical Control Format Indicator Channel (PCFICH), the BS may transmit various control information to or more UEs through the control region, and for control information transmission, a Physical Downlink Control Channel (PDCCH), a PCFICH, and a physical hybrid automatic repeat request indicator channel (PHICH) may be allocated to the control region.

The BS transmits information associated with resource allocation of a Paging Channel (PCH) and a downlink shared channel (DL-SCH) as transport channels, an UL scheduling grant, hybrid automatic repeat request (HARQ) information, a Downlink Assignment Index (DAI), etc. to every UEs or UE groups on the PDCCH.

The BS may transmit data for a UE or a UE group through the data region. The data transmitted through the data area is also referred to as user data. For transmission of user data, a Physical Downlink Shared Channel (PDSCH) may be allocated to the data region. The PCH and DL-SCH are transmitted through the PDSCH. The UE may read data transmitted through the PDSCH by decoding control information transmitted through the PDCCH. Information indicating to which UE or UE group PDSCH data is transmitted and information indicating how the UE or UE group should receive and decode PDSCH data are transmitted through the PDCCH. For example, it is assumed that a specific PDCCH is CRC-masked using a Radio Network Temporary Identity (RNTI) 'a' and information on data transmitted using a radio resource 'B' (e.g., frequency location) and using transport format information 'C' (e.g., transmission block size, modulation scheme, coding information, etc.) is transmitted through a specific subframe. Then, the UE in the cell monitors the PDCCH using its RNTI information. The UE having RNTI 'a' receives the PDCCH, and receives the PDSCH indicated by 'B' and 'C' through information of the received PDCCH.

Multiple PDCCHs may be transmitted in the control region. The UE may monitor multiple PDCCHs to detect its PDCCH. Downlink Control Information (DCI) carried by the PDCCH may differ in size and purpose according to a DCI format and in size according to a coding rate.

DCI formats may be applied independently for each UEs, and PDCCHs for multiple UEs may be multiplexed in subframes the PDCCH for each UEs may be channel coded independently so that a Cyclic Redundancy Check (CRC) can be added to the PDCCH-masking the CRC using the -only identifier of each UEs so that each UEs can receive their PDCCH-however, because the UE is essentially unaware of where its PDCCH is transmitted, the UE is required to perform blind detection (also referred to as blind decoding) for all PDCCHs of the corresponding DCI format in every subframes until a PDCCH with its identifier is received.

Fig. 11 illustrates an exemplary UL subframe structure in a wireless communication system.

Referring to fig. 11, a UL subframe may be divided into a control region and a data region in a frequency domain, or more Physical Uplink Control Channels (PUCCHs) may be allocated to the control region to carry Uplink Control Information (UCI), or more Physical Uplink Shared Channels (PUSCHs) may be allocated to the data region to carry user data.

The UCI carried by the PUCCH may be different in size and purpose according to the PUCCH format and in size according to a coding rate. For example, the PUCCH format may be defined as follows.

[ Table 2]

In the UL subframe, subcarriers far from a Direct Current (DC) subcarrier are used as a control region. In other words, subcarriers located at both ends of the UL transmission bandwidth are assigned for UL control information transmission. The DC subcarrier is reserved not in signal transmission and is mapped to the carrier frequency f in the frequency up-conversion process caused by the OFDM/SC-FDMA signal generator 306₀。

The RBs of an RB pair allocated to UEs in a subframe occupy different subcarriers in two slots this is referred to as frequency hopping of the RB pair allocated to PUCCH beyond the slot boundary however, if frequency hopping is not used, the RB pair occupies the same subcarrier regardless of frequency hopping, PUCCH for UEs is assigned to RB pairs in subframes and thus, in UL subframes, the same PUCCH is transmitted times over RBs in every slots, two times in total.

In addition, for convenience of explanation, a PUCCH carrying acknowledgement/negative acknowledgement (ACK/NACK) is referred to as ACK/NACK PUCCH, a PUCCH carrying Channel Quality Indicator (CQI)/Precoding Matrix Indicator (PMI)/Rank Information (RI) is referred to as Channel State Information (CSI) PUCCH, and a PUCCH carrying Scheduling Request (SR) is referred to as SR PUCCH.

PUCCH resources for UCI transmission are assigned from the BS to the UE according to an explicit or implicit scheme.

UCI, such as ACK/NACK, CQI, PMI, RI, SR, etc., may be transmitted through a control region of the UL subframe.

In a wireless communication system, a BS and a UE transmit/receive signals or data to/from each other. If the BS/UE transmits data to the UE/BS, the UE/BS decodes the received data. If the data is successfully decoded, an ACK is transmitted to the BS/UE. If the data decoding fails, a NACK is transmitted to the BS/UE. In the 3GPP LTE system, the UE receives a data unit (e.g., PDSCH) from the BS and transmits ACK/NACK for the data unit to the BS through an implicit PUCCH resource determined by a PDCCH resource carrying scheduling information for the data unit.

Fig. 12 illustrates an example of determining PUCCH resources for ACK/NACK.

In an LTE system, PUCCH resources for ACK/NACK are not previously allocated to every UEs, and a plurality of UEs located in a cell use the plurality of PUCCH resources in a divided manner at every time points, in particular, PUCCH resources for ACK/NACK transmission of UEs are implicitly determined based on a PDCCH carrying scheduling information of a PDSCH carrying corresponding DL data, wherein the entire region where the PDCCH is transmitted in a DL subframe includes a plurality of Control Channel Elements (CCEs), and the PDCCH transmitted to the UEs includes or more CCEs.A plurality of Resource Element Groups (REGs) (e.g., 9 REGs) are included per CCEs. REGs are composed of four consecutive REs when a Reference Signal (RS) is excluded.A UE transmits ACK/NACK through an implicit PUCCH resource which is derived or calculated using a function of a specific CCE index (e.g., th or lowest CCE index) among CCEs constituting the PDCCH received by the UE.

Referring to fig. 12, assuming that PDSCH scheduling information is transmitted to a UE through a PDCCH consisting of CCEs numbered 4 to 6, the UE transmits ACK/NACK to a BS through a PUCCH derived or calculated from CCE number 4, i.e., the lowest CCE of the PDCCH, for example, through PUCCH number 4, as shown in fig. 12, fig. 12 shows examples in which up to M' CCEs exist in a DL subframe and up to M PUCCH resources exist in a UL subframe.

For example, the PUCCH resource index may be determined as follows.

[ equation 1]

Here, n is⁽¹⁾ _PUCCHIs PUCCH resource index, N, for ACK/NACK transmission⁽¹⁾ _PUCCHIs a signaling value received from a higher layer, and n_CCERepresents the lowest CCE index used for PDCCH transmission.

Fig. 13 illustrates exemplary communication in a single carrier case. Fig. 13 may correspond to an example of communication in an LTE system.

Referring to fig. 13, an -based FDD wireless communication system transmits and receives data through DL bands and UL bands corresponding to the DL bands.

Fig. 14 illustrates exemplary communication in a multi-carrier case.

An LTE-a system uses carrier aggregation or bandwidth aggregation that uses a wider UL/DL bandwidth by aggregating multiple UL/DL frequency blocks to employ a wider frequency band, a multicarrier system or Carrier Aggregation (CA) system refers to a system that aggregates multiple carriers each with a narrower bandwidth than a target bandwidth for broadband support, when aggregating multiple carriers with a narrower bandwidth than the target bandwidth, the bandwidth of the aggregated carriers may be limited to the bandwidth used in the legacy system in order to maintain backward compatibility with the legacy system, for example, an LTE system may support bandwidths of 1.4, 3, 5, 10, 15, and 20MHz, and an LTE-advanced (LTE-a) system improved from the LTE system may support a bandwidth wider than 20MHz using the bandwidth supported in the LTE system.

For example, referring to fig. 14, 5 CCs of which each is 20MHz may be aggregated on every of UL and DL to support a bandwidth of 100MHz, the corresponding CCs may be continuous or discontinuous in a frequency domain, for convenience, fig. 14 shows a case in which a bandwidth of a UL CC is the same as that of a DL CC and both are symmetrical, however, a bandwidth of each CC may be independently determined, for example, a bandwidth of a UL CC may be configured in a manner of 5MHz (UL CC0) +20MHz (UL CC1) +20MHz (UL CC2) +20MHz (UL CC3) +5MHz (UL CC4), an asymmetric CA may be configured in a manner of 5MHz (UL CC0) +20 MHz), wherein the number of UL CCs is different from the number of DL CCs, the asymmetric CA may be generated due to limitation of available frequency bands, or may be intentionally formed by network configuration, for a specific UE, even when a BS manages X DL CCs is managing X DL CCs, a specific DL CC may be limited to a specific UE CC or a specific UE CC is not less, a specific CC may be configured by a specific UE BS, or a specific UE may be limited by a specific UE management CC, or a specific UE may be limited by a specific CC, for a specific UE management UE, or a specific UE may be limited by a specific UE management CC, or a specific UE management UE, as a specific UE, or a specific UE, a specific CC, or a specific UE, a specific CC may be monitored by a specific UE/UE, for a specific UE, a specific UE management, a specific UE, or a UE, a specific UE/UE may be configured, or a UE, may be monitored by a UE, a primary CC, a specific UE, a UE, or a UE/UE, a UE CC, a UE/or a UE management, may be monitored by a specific UE, a specific UE/or a UE, a specific UE, a UE management, a UE/or a specific UE, may be monitored by a specific UE/or a UE, a specific UE.

No least of the allocated CCs are disabled unless the overall CC allocation to the UE is reconfigured or the UE is switched.hereinafter, the CCs that are not disabled unless the overall CC allocation to the UE is reconfigured are referred to as primary CCs (PCC) and the CCs that the BS is able to freely activate/disable are referred to as secondary CCs (SCCs). Single carrier communication uses PCs for communication between the UE and the BS and does not use SCCs for communication.simultaneously, the PCCs and SCCs may also be distinguished based on control information.A particular control information may be set to transmit/receive only through a particular CC.such a particular CC may be referred to as PCC 865, and the other 1 or more CCs may be referred to as or more SCCs.A control information transmitted through a PUCCH may correspond to such particular control information if the control information transmitted on the PUCCH can be transmitted from the UE to the BS only through a particular CC, and the other PCC may be referred to as a PCC or more SCCs.A control information transmitted through a PUCCH may correspond to such particular control information if the control information transmitted on the PUCCH can be transmitted from the UE to the UE only through a PCC, may be referred to a PCC 632 PCC, and may be referred to a DL 5 SCC, and may be referred to receive the UE may be referred to a DL communication using the primary CC or a DL 5 SCC, and may be referred to a DL 5 SCC may be referred to a DL 5, and may be referred to receive the UE may be referred to a synchronization signal using the UE as a DL communication using the UE, and may be referred to as a synchronization signal, if the UE, or DL communication using the primary CC, or DL communication, and may be referred to a DL communication may be referred to a DL communication, and may be referred to a synchronization signal, if the UE may be referred to as a DL communication using a synchronization signal, or DL communication using the UE, or DL communication in the DL communication, or DL.

The cell may be defined as a combination of DL resources and UL resources, i.e., a combination of DL CC and UL CC, herein, UL resources are not an indispensable component, however, this is defined in the current LTE-a standard and, in the future, may allow configuring the cell using UL resources alone, thus, the cell may be configured using DL resources alone or using both DL resources and UL resources, when CA is supported, an association between a carrier frequency of DL resources (or DL CC) and a carrier frequency of UL resources (or UL CC) may be indicated by system information, e.g., a combination of DL resources and UL resources may be indicated by system information block type 2 (2), herein, the carrier frequency indicates a center frequency of each cell or CC 64, the cell operating on a primary frequency (or PCC) may be referred to as a primary cell (PCell) and the cell operating on a secondary frequency (or PCC) may be referred to as a primary cell (PCell) and the cell (or SCell) may be referred to as a secondary cell (SCell) or a secondary cell) may be in a secondary cell state, and may be referred to as a secondary cell (SCell) may be in which may be configured, may be referred to as a secondary cell (SCell) or may be in a secondary cell) and may be configured, even if a secondary cell may be in a secondary cell (SCell) may be in a secondary cell may be referred to as a secondary cell, may be referred to a secondary cell (SCell) may be in a secondary cell) may be referred to a secondary cell (SCell, may be in a secondary cell) or a secondary cell (SCell) may be configured, may be in a secondary cell, may be configured, may be referred to as a secondary cell) and may be referred to a secondary cell may be in a secondary cell (SCell, may be referred to as a secondary cell may be referred to a secondary cell) may be in a secondary cell, may be in which may be in a secondary cell(s) or a secondary cell(s) may be in a secondary cell) may be configured, may be referred to a secondary cell(s) or a secondary cell(s) may be referred to as a secondary cell(s) and may be in a secondary cell may be configured, may be in a secondary cell(s) and may be referred to be in a secondary cell(s) may be configured, may be referred to be.

In a multi-carrier system, a BS may transmit a plurality of data units to a UE in a given or more cells (or or more CCs), and the UE may transmit ACK/NACK signals for the plurality of data units in subframes the UE may be allocated or more cells (or DL CCs) for receiving a pdsch for DL data reception, the cells (or or more DL CCs) for the UE may be semi-statically configured or reconfigured by RRC signaling, and the cells (or 3528 or more DL CCs) for the UE may be dynamically activated/deactivated by L68/L2 (medium access control (MAC)) control signaling.

Fig. 15 describes a concept that MAC layers manage multiple carriers in a BS fig. 16 describes a concept that MAC layers manage multiple carriers in a UE.

Referring to fig. 15 and 16, MAC layers manage or more frequency carriers in order to perform transmission and reception, more flexible resource management is possible because the frequency carriers managed by MAC layers are not necessarily contiguous, in fig. 15 and 16, physical layers (PHYs) represent ccs for convenience, here, PHYs do not necessarily represent independent Radio Frequency (RF) devices, generally, independent RF devices represent PHYs but are not limited thereto, RF devices may include several PHYs.

Fig. 17 describes a concept in which a plurality of MAC layers manage a plurality of carriers in a BS, and fig. 18 describes a concept in which a plurality of MAC layers manage a plurality of carriers in a UE fig. 19 describes another concepts in which a plurality of MAC layers manage a plurality of carriers in a BS, and fig. 20 describes another concepts in which a plurality of MAC layers manage a plurality of carriers in a UE.

In addition to the structure as shown in fig. 15 and 16, a plurality of MAC layers instead of MAC layers may control a plurality of CCs as shown in fig. 17 to 20.

As shown in fig. 17 and 18, each MAC layers may control each carriers with a to correspondence as shown in fig. 19 and 20, each MAC layers may control each carriers with to correspondence with partial carriers and MAC layers may control or more carriers with other carriers.

A system suitable for use with the above description is one that supports carriers to N multiple carriers, and the carriers may be contiguous or non-contiguous carriers, regardless of UL/DL.

If the number of CCs aggregated in the UL is equal to the number of CCs aggregated in the DL, the CCs can be configured such that all CCs are compatible with CCs used in a legacy system. However, CCs that do not support compatibility are not excluded from the present invention.

For convenience of explanation, although explanation is given under the assumption that a PDSCH corresponding to a PDCCH is transmitted on DL CC #0 when the PDCCH is transmitted on DL CC #0, it is apparent that cross-carrier scheduling may be applied such that the PDSCH is transmitted on a DL CC different from DL CC # 0.

Fig. 21 and 22 illustrate slot level structures of PUCCH formats 1a and 1b for ACK/NACK transmission.

Fig. 21 illustrates PUCCH formats 1a and 1b in case of a normal CP, and fig. 22 illustrates PUCCH formats 1a and 1b in case of an extended CP. a UE transmits ACK/NACK signals through different Cyclic Shifts (CS) (frequency-domain codes) and Orthogonal Cover (OC) of a computer-generated constant amplitude zero auto-correlation (CG-CAZACC) sequence or different resources of an orthogonal cover code decoder (OCCc) (time-domain spread code decoder). OC includes, for example, walsh/DFT orthogonal codes.if the number of CS is 6 and the number of OC is 3, a total of 18 UE. can be multiplexed in the same Physical Resource Block (PRB) based on a single antenna to apply orthogonal sequences w0, w1, w2, and w3. for SR format transmission in the same time-domain slot (after FFT modulation) or in the same frequency domain (before FFT modulation) and in the same modulation scheme in the same modulation level structure as PUCCH formats 1a and 1 b.

The UE may be allocated PUCCH resources consisting of CS, OC and PRB through Radio Resource Control (RRC) signaling for SR transmission and for ACK/NACK feedback for semi-persistent scheduling (SPS). As described with reference to fig. 12, for dynamic ACK/NACK (or for non-persistently scheduled ACK/NACK) feedback or for ACK/NACK feedback of a PDCCH indicating SPS release, a PUCCH resource may be implicitly allocated to a UE using the lowest CCE index of a PDCCH corresponding to a PDSCH or PDCCH for SPS release.

Fig. 23 illustrates a scenario in which UCI is transmitted in a wireless communication system supporting CA. For convenience of explanation, it is assumed in this example that the UCI is ACK/NACK (A/N). However, the UCI may include control information such as CSI (e.g., CQI, PMI, and RI) and scheduling request information (e.g., SR), without limitation.

Fig. 23 illustrates an exemplary asymmetric CA in which 5 DL CCs are linked to a single UL CC, the asymmetry CA. may be set from the viewpoint of transmitting UCI, i.e., the DL CC-UL CC association for UCI may be set to be different from the DL CC-UL CC association for data, for convenience, if it is assumed that up to two codewords can be carried per DL CCs and the number of ACK/NACKs for each CCs depends on the maximum number of codewords set per CCs (e.g., if a BS sets up to two codewords for a particular CC, even if the particular CCThe PDCCH uses only codewords on that CC, the ACK/NACK for that CC is set to 2, i.e., the maximum number of codewords on that CC), then at least two UL ACK/NACK bits are needed for every DL CCs in this case, at least 10 ACK/NACK bits are needed to transmit ACK/NACK for data received on 5 DL CCs on a single UL CC, if a Discontinuous Transmission (DTX) status is also indicated for every DL CCs, at least 12 bits are needed (5 bits ═ 5)⁶3125-11.61 bits) for ACK/NACK transmission. This structure cannot transmit increased ACK/NACK information because up to two ACK/NACK bits are available in the conventional PUCCH formats 1a and 1 b. Although CA is given as an example of a cause of increasing the number of UCI, this case may also occur due to an increase in the number of antennas and the presence of backhaul subframes in the TDD system and the relay system. Similar to the ACK/NACK transmission, when control information related to a plurality of DL CCs is transmitted on a single UL CC, the amount of control information to be transmitted also increases. For example, transmission of CQI/PMI/RI information related to multiple DL CCs may increase UCI payload.

In fig. 23, a UL anchor CC (also referred to as UL PCC or UL primary CC) is a CC on which a PUCCH or UCI is transmitted, and may be cell/UE-specifically determined. In addition, the DTX status may be explicitly fed back, or may be fed back so as to share the same status as NACK.

Hereinafter, a method for effectively transmitting increased UCI will be proposed with reference to the accompanying drawings. In particular, a new PUCCH format/signal processing operation/resource allocation method for transmitting increased UCI is proposed. The new PUCCH format proposed by the present invention is referred to as CA PUCCH format or PUCCH format 3 relative to PUCCH format 2 defined in legacy LTE release 8/9. The technical features of the proposed PUCCH format may be easily applied to any physical channel (e.g., PUSCH) capable of communicating UCI in the same manner or in a similar manner. For example, the embodiments of the present invention are applicable to a periodic PUSCH structure in which control information is periodically transmitted or an aperiodic PUSCH structure in which control information is non-periodically transmitted.

The drawings and embodiments of the present invention will be described focusing on the case where a UCI/RS symbol structure of a PUCCH format 1/1a/1b (normal CP) of conventional LTE is used as a subframe/slot-level UCI/RS symbol structure applied to PUCCH format 3, however, the subframe/slot-level UCI/RS symbol structure of PUCCH format 3 is exemplarily defined for convenience and the present invention is not limited to such a specific structure.the number and position of UCI/RS symbols can be freely changed in the PUCCH format 3 of the present invention according to system design.A PUCCH format 3 according to embodiments of the present invention can be defined using an RS symbol structure of a PUCCH format 2/2a/2b of conventional LTE, for example.

PUCCH format 3 according to an embodiment of the present invention may be used to transmit UCI of any type or size. For example, information such as HARQ ACK/NACK, CQI, PMI, RI, and SR may be transmitted in PUCCH format 3 according to an embodiment of the present invention. The information may have a payload of any size. For convenience of explanation, the following description focuses on the transmission of ACK/NACK information in PUCCH format 3 according to the present invention.

Fig. 24 to 27 illustrate a PUCCH format structure for feeding back a plurality of ACK/NACK bits and a signal processing operation thereof. For example, when a plurality of ACK/NACK bits are fed back in a multi-carrier environment, a PUCCH format may be used. Such PUCCH format may be referred to as PUCCH format 3 to distinguish it from the conventional series of PUCCH formats 1 and 2.

Fig. 24 to 27 illustrate DFT-based PUCCH format structures. According to the DFT-based PUCCH structure, the PUCCH is DFT-precoded and to which time domain OC is applied at the SC-FDMA level before transmission. Hereinafter, the DFT-based PUCCH format will be referred to as PUCCH format 3.

Fig. 24 illustrates an exemplary structure of PUCCH format 3 of OC using Spreading Factor (SF)4(SF 4)., referring to fig. 24, a channel coding block channel codes information bits a _0, a _1, a.. a, a _ M-1 (e.g., a plurality of ACK/NACK bits) and generates coded bits (or codewords) b _0, b _1, a.., b _ N-1. M is the size of the information bits and N is the size of the coded bits, the information bits include UCI, e.g., a plurality of ACK/NACK for a plurality of data (or PDSCH) received on a plurality of DL CCs, where the information bits a _0, a _1, a.., a _ M-1 are jointly coded regardless of the type/number/size of UCI constituting the information bits, a _ M-1, e.g., if the information bits include a plurality of ACK/NACK for a plurality of DL CCs, channel coding is performed for the entire bit information, rather than performing channel coding for every DL or DL CC, a single LDPC coding block may be performed by matching a single LDPC coding function, although the channel coding block may be implemented by matching a single LDPC coding block coding, a simple coding block coding may be implemented by taking into account, a puncturing function may be performed, a single coding block coding may be implemented, a coding scheme, a coding block matching a coding may be implemented, a coding block coding scheme, a coding scheme may be implemented, a coding scheme, a decoding scheme may be implemented, and.

The modulator generates modulation symbols c _0, c _1, ·, c _ L-1 by modulating the coded bits b _0, b _1, ·, b _ M-1. L is the size of the modulation symbol. The modulation scheme is performed by varying the amplitude and phase of the transmitted signal. Modulation schemes include, for example, n-phase shift keying (n-PSK) and n-Quadrature Amplitude Modulation (QAM) (where n is an integer of 2 or more). In particular, the modulation scheme includes Binary PSK (BPSK), Quadrature PSK (QPSK), 8-PSK, QAM, 16-QAM, or 64-QAM.

The divider divides the modulation symbols c _0, c _1, ·, c _ L-1 into slots the order/pattern/scheme of dividing the modulation symbols into slots is not limited to a specific , for example, the divider may sequentially divide the modulation symbols into slots starting from the modulation symbol (partial scheme), in which case the modulation symbols c _0, c _1,. and c _ L-1 may be allocated to the slot 0, and the modulation symbols c _ L/2, c _ L/2+1,. and c _ L-1 may be allocated to the slot 1.

Referring to fig. 24, modulation symbols c _0, c _1,. lograph, c _ L/2-1 allocated to a slot 0 are DFT-precoded as DFT symbols d _0, d _1,. lograph, d _ L/2-1, and modulation symbols c _ L/2, c _ L/2+1,. lograph, c _ L-1 allocated to a slot 1 are DFT-precoded as DFT symbols d _ L/2, d _ L/2+1,. lograph, d _ L-1, DFT precoding may be replaced with another linear operation (e.g., walsh precoding).

The spreading block spreads the DFT-precoded signal (in the time domain) at the SC-FDMA symbol level, the time domain spreading at the SC-FDMA symbol level is performed using spreading codes (sequences), the spreading codes include quasi-orthogonal codes and orthogonal codes, the quasi-orthogonal codes include, but are not limited to, pseudo-noise (PN) codes, the orthogonal codes include, but are not limited to, walsh codes and DFT codes, although the orthogonal codes are described as typical examples of spreading codes for convenience of explanation, the orthogonal codes may be replaced with the quasi-orthogonal codes, the spreading code size or the maximum value of SF is limited by the number of SC-FDMA symbols used for transmission of control information, for example, if four SC-FDMA symbols are used for control information transmission in slots, the orthogonal codes w0, w1, w2, w 3. SF of length 4 may be used in every slots, and the degree of spreading of control information may be related to the antenna multiplexing order of the UE.

The signal resulting from the above operation is mapped to subcarriers in a PRB and 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 terminal.

The coding rate is 0.0625 (SF 12/192) if ACK/NACK is transmitted for 5 DL CCs, then every operations will be described in more detail if every DL CCs can transmit two PDSCHs, the ACK/NACK bits for this PDSCH can be 12 bits, including DTX status under the assumption of QPSK and time spreading of SF-4 the size of the coded block (after rate matching) can be 48 bits the coded bits are modulated to 24 QPSK symbols and the QPSK symbols are divided into two slots, each slot includes 12 QPSK symbols, the 12 QPSK symbols in each slots are converted to 12 DFT symbols by 12-point DFT, the 12 QPSK symbols in each slots are spread to four SC-FDMA symbols in the time domain using a spreading code of 4 and then mapped, since 12 bits are transmitted on [2 bit x 12 sub-carrier x 8SC-FDMA symbols ], the coding rate is 0.0625 (SF 12/192) if SF-4, then a maximum of four PRBs can be multiplexed on each UE .

Fig. 25 illustrates an exemplary structure of PUCCH format 3 using OC of SF-5.

The basic signal processing operation is performed in the same manner as described with reference to fig. 25 except for the number and positions of UCI SC-FDMA symbols and RS SC-FDMA symbols. The spreading block may be applied in advance at the front end of the DFT precoder.

In fig. 25, the RS may use the same structure as those used in the LTE system. For example, the base sequence may be cyclically shifted. The multiplexing capacity of the data portion is 5 since SF is 5. However, by CS interval Δ_shift ^PUCCHThe multiplexing capacity of the RS part is determined. For example, the multiplexing capacity may be 12/Δ_shift ^PUCCH. In this case, for a_shift ^PUCCH＝1、Δ _shift ^PUCCH2 and Δ_shift ^PUCCHThe multiplexing capacities for the case of 3 are 12, 6 and 4, respectively. In that

In fig. 25, although the multiplexing capacity of the data portion is 5 because SF is 5, the multiplexing capacity of the RS portion is Δ_shift ^PUCCHIs 4 in the case of (1). Thus, the overall multiplexing capacity may be limited to the smaller of these two values 4.

Fig. 26 illustrates an exemplary structure of PUCCH format 3 capable of increasing multiplexing capacity at a slot level.

The overall multiplexing capacity can be increased by applying the SC-FDMA symbol-level spreading described with reference to fig. 24 and 25 to the RSs. Referring to fig. 26, multiplexing capacity is added by applying walsh covering (or DFT code covering) within a slotAnd (4) doubling. Then, the multiplexing capacity is even at Δ_shift ^PUCCHIs also 8 in the case of (1), thereby preventing the multiplexing capacity of the data portion from being reduced. In FIG. 26, [ y1y2]＝[1 1]、[y1 y2]＝[1 -1]Or a linear transformation thereof (e.g., [ j j ]][j –j]、[1 j][1 –j]Etc.) can be used for the OC for the RS.

Fig. 27 illustrates an exemplary PUCCH format 3 structure capable of increasing multiplexing capacity at a subframe level.

In case of not applying slot level hopping, multiplexing capacity is doubled times by applying walsh cover in units of slots, and as described above, [ x1 x2] ═ 11, [ 1-1 ] or its transform can be used as OC.

For reference, the processing operation of the PUCCH format 3 is not limited to the order shown in fig. 24 to 27.

Channel selection

Channel selection refers to the expression/transmission of specific information by selecting a specific resource from a plurality of resources. A common channel selection is a scheme for transmitting specific information through a combination of resources and constellations.

Here, the resources may be specified by physical time-frequency resources and/or sequence resources (e.g., CS values). For example, in LTE release 8 PUCCH format 1/1a/1b, a particular resource may be selected by a combination of OC, CS, and Physical Resource Unit (PRU). It can be assumed that a plurality of resources on which channel selection is performed are distinguished by a combination of the above three resources. For example, the channel selection method shown in table 3 below may be used.

[ Table 3]

In table 3 above and in the following description, the values expressed as a, b, c, … may represent constellation values resulting from modulation (e.g., BPSK, QPSK, etc.) in a channel Ch-x (x ═ 1, 2, 3,..). Alternatively, the values expressed as a, b, c, … may be values multiplexed, scrambled or covered by the assigned sequence or assigned code, rather than constellation values. Accordingly, the values expressed as a, b, c, … with respect to Ch-x may be values that can be distinguished therebetween, and the method for distinguishing between these values is not limited. In particular, in the following description, for convenience of description, a value expressed as a, b, c, … with respect to Ch-x is referred to as a modulation value.

In addition, the values expressed as a, b, c, … may be predetermined specific values instead of 0. For example, a can be '+ 1' and b can be '-1'.

In the example of table 3, even if the same value is transmitted, different information (i.e., ACK or NACK) may be transmitted depending on which channel is used for transmission-for example, for ACK transmission, the value a is transmitted in the RS portion of resource 1 (i.e., channel 1) and the value b is transmitted in the data portion of resource 1 for NACK transmission, a is transmitted in the RS portion of resource 2 (i.e., channel 2) and b is transmitted in the data portion of resource 2.

In table 3, a simple example is shown where no complex constellation mapping is used, but additional constellation mappings may be used for transmitting more information. Table 4 shows an example of using two types of distinguishable constellation mapping (e.g., BPSK).

[ Table 4]

In table 4 above, a, b, and c may be specific values other than 0. Note that it is preferable that b and c are distant from each other in the constellation. For example, a may be used as '+ 1', and b and c may be used as '+ 1' and '-1', respectively, or '-1' and '+ 1', respectively. In the example of table 4, a value modulated as b is transmitted in resource 1 (channel 1) for ACK/ACK transmission and a value modulated as c is transmitted in resource 1 (channel 1) for ACK/NACK transmission. In addition, a value modulated to b is transmitted in resource 2 (channel 2) for NACK/ACK transmission, and a value modulated to c is transmitted in resource 2 (channel 2) for NACK/NACK transmission.

The mapping relationship of channel selection for ACK/NACK transmission in TDD, which is used in the conventional LTE release 8/9, is defined in tables 5, 6, and 7 shown below. In LTE release 8/9, TDD ACK/NACK multiplexing may have the same meaning as TDDACK/NACK channel selection, but they have different meanings in a multi-carrier support system (e.g., LTE-a or LTE release 10) described below.

In tables 5, 6 and 7 below, in the TDD system, K may be indexed by DL correlation set: { k } is a function of₀,k₁,…k_M-1As defined in table 12 described later). For example, if M is 2 in table 5, two PUCCH resources

And

and QPSK constellation 'b (0), b (1)' in every PUCCH resources may be used to transmit two types of ACK/NACK information, including spatial bundling (i.e., ACK/NACK bundling for multiple codewords).

Specifically, the UE uses PUCCH format 1b in ACK/NACK resources in subframe n

The upper transmit bit 'b (0), b (1)'. The values 'b (0), b (1)' and ACK/NACK resources may be generated by channel selection according to tables 5, 6 and 7 below

Tables 5, 6 and 7 show ACK/NACK multiplexing transmission when M-2, M-3 and M-4, respectively. If 'b (0), b (1)' is mapped to NACK/ACK, the UE does not transmit an ACK/NACK response in subframe n.

[ Table 5]

[ Table 6]

[ Table 7]

In tables 5, 6 and 7, HARQ-ACK (i) indicates a HARQ ACK/NACK/DTX result for the ith (0 ≦ i ≦ 3) data unit DTX denotes that no data unit is transmitted for the corresponding HARQ-ACK (i) or that the UE has not detected a data unit corresponding to HARQ-ACK (i)⁽¹⁾ _PUCCH,0To n⁽¹⁾ _PUCCH,3) Transmitting multiplexed ACK/NACK signals through PUCCH resources selected from occupied PUCCH resources in tables 5, 6, and 7, n⁽¹⁾ _PUCCH,xPUCCH resources for actual ACK/NACK transmission are indicated, and 'b (0) b (1)' indicates two bits transmitted through the selected PUCCH resource, which are modulated using QPSK. For example, if the UE successfully decodes four data units as in table 7, the UE connects to n⁽¹⁾ _PUCCH,1Since the combination of PUCCH resources and QPSK symbols cannot represent all available ACK/NACKs, NACK and DTX are coupled (expressed as NACK/DTX) except in cases.

Meanwhile, in the LTE-a (or LTE release 10) system to which the present invention is applied, there is no particular limitation on a channel selection mapping relationship for applying a channel selection method. For example, a channel selection mapping relationship for transmitting ACK/NACK information as shown in tables 8 to 10 may be defined. Table 8 defines a mapping relationship for 2-bit ACK/NACK, table 9 defines a mapping relationship for 3-bit ACK/NACK, and table 10 defines a mapping relationship for 4-bit ACK/NACK.

[ Table 8]

[ Table 9]

[ Table 10]

Alternatively, a channel mapping relationship for 1-bit to 4-bit ACK/NACK as shown in Table 11 may be defined in the example of Table 11, channel resources h0 and constellation values 1 and-1 generated through data modulation may be used to transmit 1-bit ACK/NACK information for the transmission of 2-bit ACK/NACK information, three channel resources h0, h1, and h2 and constellation values 1, -j, and j generated through data modulation and four channel resources h0, h1, h2, and h3 and constellation values 1, -j, and j generated through data modulation may be used to transmit 4-bit ACK/NACK information for the transmission of 3-bit ACK/NACK information.

[ Table 11]

UL for DL transmission in a multi-carrier support system ACK/NACK

If DL CCs and UL CCs are asymmetrically configured, a cell may refer to only DL CCs (or UL CCs), for example, if a specific UE is configured with serving cells, there are DL CCs and UL CCs.

The association between carrier frequencies of DL and UL resources (center frequencies of cells) may be indicated by system information transmitted on the DL resources. For example, the combination of DL resources and UL resources may be configured by association defined by SIB 2.

For a UE supporting CA, the &ttttranslation = one "&gtt-l/t &gtt &/or a plurality of scells may be aggregated with the PCell to support an increased bandwidth.

Meanwhile, for a UE in RRC _ CONNECTED state configured with CA, the serving cell refers to a set of or more cells including a PCell and an SCell.

The PCell is a central cell controlling related communications among serving cells configured in a CA environment. The PCell is a cell indicated or used by the UE in an initial connection setup procedure, a connection re-establishment procedure, or a handover procedure. In LTE-a release 10, a UE may receive and transmit PUCCH only on its PCell. In future releases, PUCCH transmission on the SCell of the UE may be allowed. In addition, the UE may perform a monitoring procedure for system information acquisition and change only on the PCell. For the CA supporting UE, the BS may be changed only through a handover procedure using an RRCConnectionReconfiguration message including mobilityControlInfo.

In LTE-a release 10, there is no pucch on the SCell, if the SCell is added, the BS may provide all system information related to operation on the SCell in RRC _ CONNECTED state to the CA-capable UE through dedicated signaling.

In a CA environment, PhyCellId, scelllindex, and ServCellIndex may be defined as RRC-related parameters/Information Elements (IEs). PhyCellId may have an integer ranging from 0 to 503 and may be used as a physical layer identifier of a cell. Scelllindex may have an integer ranging from 1 to 7, and may be used as an identifier of an SCell. The ServCellIndex may have an integer ranging from 0 to 7 and may be used as an identifier of a serving cell (PCell or SCell). The ServCellIndex having a value of 0 may be applied to the PCell, and for the SCell, the scelllindex may be applied. That is, a cell having the smallest (or lowest) cell index in the ServCellIndex may be defined as PCell.

In summary, if there are multiple configured serving cells, the cell with the smallest ServCellIndex in the cell is PCell and the other cells are scells. in LTE-a release 10, if the UE has multiple configured serving cells in TDD, the UL-DL configuration constituting the UL subframe and DL subframe in a frame may be the same in all cells, and HARQ-ACK timing according to the UL-DL configuration, which indicates which UL subframe is used to transmit ACK/nack for PDSCH transmitted in a specific DL subframe, may be the same in future releases, in TDD, if the UE has multiple configured serving cells in TDD, the UL-DL configuration may be different between cells, and HARQ-timing according to the UL-DL configuration may be different between cells.

In addition, the UE may transmit UCI such as CSI (including CQI, RI, PMI, etc.) and HARQ ACK/NACK measured from or more CCs to the BS in predetermined CCs-for example, if multiple ACK/NACK feedbacks are required, the UE may collect ACK/NACK feedbacks (e.g., ACK/NACK multiplexing or ACK/NACK bundling) received from PCell DL CCs and or more SCell DL CCs and may transmit the collected ACK/NACK feedbacks to the BS in UL CCs of the PCell using PUCCHs.

In the present invention, when a plurality of ACK/NACK signals for a plurality of DL transmissions are transmitted through PUCCHs, units constituting the plurality of DL transmissions ( or more subframes and/or or more carriers) are referred to as bundling windows.

In addition, a unit for actually performing time domain bundling and/or CC domain bundling using a logical and (or logical or) operation may be referred to as an actual bundling window, i.e., or more actual bundling windows may exist among bundling windows.

An example of ACK/NACK required for DL transmission defined in the 3GPP LTE system will now be described. Here, when ACK/NACK is transmitted in subframe n, the ACK/NACK is correlated with DL transmission in subframe n-k.

In a TDD system, with respect to the relationship between subframe n and subframe n-K, as shown in Table 12, a DL correlation set index K: { K } can be given for every UL-DL configurations of Table 1₀,k₁,…k_M-1}。

[ Table 12]

In FDD, M is always 1, and K always satisfies { K }₀When ACK/NACK for DL transmission in subframe n-k is transmitted in subframe n, the DL transmission in subframe n-k may correspond to or more of the following three cases.

Case 1 is when ACK/NACK feedback is required for or more PDSCHs indicated by or more PUCCHs detected in or more subframes n-K here, K ∈ K, and K varies according to subframe index n and UL-DL configuration, and includes M elements { K } K₀,k₁,...k_M-1}. Table 12 below shows K: { k } is a function of₀,k₁,...k_M-1}. case 1 relates to or more PDSCHs requiring normal ACK/NACK feedback in the following description, case 1 is referred to as 'ACK/NACK for PDSCH' or 'ACK/NACK for PDSCH with PDCCH'.

Case 2 is when ACK/NACK feedback for or more PDCCHs indicating DL SPS release in or more subframes n-K is required, here, K ∈ K, and K denotes the same index as in the description given in case 1 ACK/NACK of case 2 denotes ACK/NACK feedback for or more PDCCHs for SPS release.

Case 3 is when ACK/NACK feedback is required for transmission of or more PDSCHs, where there are no corresponding or more PDCCHs detected in or more subframes here, K ∈ K, and K denotes the same index as in the description given in case 1 case 3 relates to PDSCHs without PDCCHs and denotes ACK/NACK feedback for PDSCHs allocated by SPS.

In the following description, PDSCH with corresponding PDCCH, PDSCH for DL SPS release, and PDSCH without corresponding PDCCH are collectively referred to as DL transmission requiring ACK/NACK transmission.

An example of the present invention when the above ACK/NACK for DL transmission is applied to a multi-carrier system will be described in detail below.

For convenience of explanation, examples of the present invention will be described under the following assumptions. However, the embodiments of the present invention are not limited to the following assumptions.

(1) There may be pcells and or multiple scells.

(2) There may be a PDSCH with a corresponding PDCCH on the PCell and or more scells.

(3) There may be a PDCCH indicating DL SPS release only on the PCell.

(4) There may be only a PDSCH without a corresponding PDCCH on the PCell (═ SPS PDSCH).

(5) Cross scheduling from PCell to or more scells may be supported.

(6) Cross scheduling from or more scells to PCell is not supported.

(7) Cross scheduling from or more scells to another scells (or other scells) may be supported.

In the description of the present invention, time domain bundling and/or CC domain bundling represents a logical and operation. However, the time domain bundling and/or the CC domain bundling may be performed by other methods such as a logical or operation, etc. That is, time domain bundling or CC domain bundling refers to a method for expressing a plurality of ACK/NACKs over a plurality of subframes or CCs as ACK/NACK information having fewer bits in an ACK/NACK response using a single PUCCH format. In other words, time domain bundling or CC domain bundling refers to any method for expressing M-bit ACK/NACK information as N bits (M ≧ N).

In a system to which multi-carrier and/or TDD is applied, a plurality of ACK/NACK bits may be transmitted through channel selection using PUCCH format 1a/1b, PUCCH format 3, or channel selection using PUCCH format 3. For PUCCH resource index for PUCCH format, implicit mapping, explicit mapping, or a combination of implicit and explicit mapping may be used. The implicit mapping may use a method for deriving a PUCCH resource index based on the lowest CCE index of a corresponding PDCCH. The explicit mapping may use a method of indicating or deriving a PUCCH resource index in a set predetermined by RRC configuration through an ACK/NACK resource indicator (ARI) in the PDCCH.

In relation to the present invention, when a new format (e.g., PUCCH format 3 described with reference to fig. 24 to 27) for transmitting a plurality of ACK/NACK bits, resource allocation of PUCCH format 3 is basically performed based on explicit resource allocation.

In addition, the final PUCCH resource may be determined by the ARI value of the DCI format in the PDCCH for the PDSCH transmitted on the SCell in the orthogonal resource predetermined by RRC configuration, in this case, the ARI may be used as an offset based on the PUCCH resource value explicitly signaled, or may be used to indicate which of or more PUCCH resource sets is to be used.

In order to include ARI information in the PDCCH, a method of reusing a field defined in a DCI format of an existing PDCCH for ARI purposes may be considered. The PDCCH may include a Transmit Power Control (TPC) field. The TPC field is originally intended to control the transmission power of the PUCCH and/or PUSCH and may be composed of 2 bits.

As described above, when the ARI is transmitted only on the SCell, the TPC field in the PDCCH on the SCell may be reused as the ARI. Meanwhile, the TPC field in the PDCCH on the PCell may be used for transmission power control of the PUCCH and/or PUSCH.

In the LTE rel-10 system, since a PDCCH for scheduling a PDSCH of a PCell cannot be received on an SCell (i.e., cross-carrier scheduling of the PDSCH of the PCell is not allowed from the PDCCH of the SCell), the meaning that a UE receives the PDSCH only on the PCell may be equivalent to the meaning that the UE receives the PDCCH only on the PCell.

Explicit ACK/NACK resource allocation configured by RRC signaling may be performed as follows.

First, a PDCCH corresponding to a PDSCH (i.e., a PDCCH for scheduling a PDSCH) on an SCell may include information (e.g., ARI) for deriving a specific PUCCH resource from or more RRC-configured resources.

Next, if a PDCCH corresponding to a PDSCH is not received on an SCell and the PDSCH is received only on a PCell, of the following case may be applied first, a PUCCH resource (i.e., PUCCH format 1a/1b) defined in LTE rel-8 may be used, and second, a PDCCH corresponding to a PDSCH on a PCell may include information (e.g., ARI) for deriving a specific PUCCH resource from or more RRC-configured resources.

The UE may assume that all PDCCHs corresponding to the PDSCH on the SCell have the same ARI.

In this way, when ARI information is defined to be transmitted only on the SCell, if the UE receives only or more PDSCHs for the PCell (or or more PDCCHs only on the PCell) in a multi-carrier and/or TDD system, a final resource index for a PUCCH format (PUCCH format 3) to be used by the UE cannot be determined because the UE cannot know ARI information transmitted from the SCell.

The present invention devised to solve the above problem proposes a method for determining a final resource index for a PUCCH format even when a UE receives only or more PDSCHs for a PCell (or or more PDCCHs only on a PCell).

In various examples of the present invention, for convenience of explanation, a case in which a UE receives only or more PDSCHs for a PCell (or a case in which the UE receives or more PDCCHs only on the PCell) is simply referred to as 'PCell reception only' here, PCell reception only is defined with respect to reception of the UE.

Also, as described above, a new PUCCH format, i.e., PUCCH format 3, may be used for ACK/NACK transmission for DL transmission received through a plurality of DL subframes in the TDD system, even when the UE includes configured cells.

In short, a PUCCH format 3 resource to be used by a UE is derived from an ARI included in a PDCCH in the RRC-configured resource candidates, when the ARI is expressed by reuse of a TPC field (2-bit size) of the PDCCH on an SCell as described above, the ARI has a size of X bits, and X may be defined as 2.

For convenience of explanation associated with the application of PUCCH format 3, the present invention is described under the assumption that transmission is performed through a single antenna requiring orthogonal resources, however, it is apparent that the present invention is not limited thereto, and the principles of the present invention are applied in the same manner even when a multi-antenna transmit diversity scheme such as Spatial Orthogonal Resource Transmit Diversity (SORTD) is applied to PUCCH format 3.

Now, exemplary assumptions of the present invention for PUCCH format 3 resource allocation are described based on the above description.

The resource for PUCCH format 3 may be expressed asAnd four orthogonal resource candidates for PUCCH format 3 may be expressed asAnd

the RRC signaling may be, for example, four separate RRC signals, the UE may be informed of sets of four orthogonal resources through RRC signaling

The UE, which has been assigned four PUCCH resource candidates, may finally determine PUCCH resources among the four PUCCH resource candidates based on the values indicated by the additionally received ARI

Table 13 below shows exemplary resource allocation for PUCCH format 3 in single antenna transmission.

[ Table 13]

Hereinafter, various embodiments of the present invention are described in detail based on the above description.

Example 1

The present embodiment 1 relates to a method of using a predefined resource allocation in a PCell-only reception case (i.e., a case of receiving only or more PDSCHs for a PCell or a case of receiving only or more PDCCHs on a PCell).

In case of PCell-only reception, a resource index of PUCCH format 3 can be determined. That is, in case of non-PCell-only reception, the UE may derive a PUCCH resource index from ARI received on the SCell, while in PCell-only reception, the UE may use a predetermined PUCCH resource index.

In particular, a new index may be predetermined such that the UE can determine PUCCH format 3 resources to be used in case of PCell reception only, the new index may have the same meaning as ARI on SCell, in other words, the index may be used to indicate any of resource candidate sets configured by RRC signaling, the index may be defined in the form of a predefined rule (or a specific value) for indicating a specific ordered resource (e.g., th resource or last th resource) in the resource candidate set.

For example, in the PCell-only reception case, an index capable of determining PUCCH format 3 resources may be defined as a system-specific value. Alternatively, the index may be RRC-configured to be eNB-specific or UE-specific.

Fig. 28 is a flowchart illustrating a predefined resource allocation for PUCCH resource determination in case of PCell-only reception.

In step S2810, the UE may receive a PUCCH resource candidate set including four resources for PUCCH format 3 through higher layer configuration (e.g., RRC signaling)

In step S2820, when PUCCH format 3 is used for ACK/NACK transmission, the UE may determine whether the situation is a PCell-only reception case. If the determined result at step S2820 is no (i.e., not the PCell-only reception case), step S2830 is performed, and if yes (i.e., the PCell-only reception case), step S2840 is performed.

In step S2830, the UE may calculate/select PUCCH resources (i.e., resource indexes) to be used by it from four PUCCH resource candidates using ARI indicated by reuse of the TPC field in or more PDCCHs of the SCell.

Meanwhile, since the PDCCH is not received on the SCell in step S2840, the UE may be from four according to a predefined rule (or a predefined index)In the illustrated example of fig. 28, the predefined rule is to select the last PUCCH resource indexes in the PUCCH resource candidate set

After step S2830 or step S2840, the UE may transmit ACK/NACK information through PUCCH format 3 using a resource corresponding to the calculated/selected index.

Example 2

This embodiment 2 relates to methods for determining a further resource index and using the further resource index for PUCCH resource allocation in case of PCell-only reception (i.e., case of receiving only or more PDSCHs for PCell or case of receiving only or more PDCCHs on PCell).

That is, the UE may derive a PUCCH resource index from an ARI received on an SCell in case of non-PCell-only reception, and the UE may use a predetermined additional PUCCH resource index in case of PCell-only reception, the predetermined index in the above embodiment 1 is a predetermined index for which is a PUCCH resource candidate configured for the UE, and the embodiment 2 is different from the embodiment 1 in that an additional resource index separate from the PUCCH resource candidate configured for the UE is predetermined.

According to this embodiment, additional resource candidates may be signaled to the UE by RRC signaling, e.g., if 2-bit ARI is used and a set of four RRC-configured resource candidates is defined, then the RRC-configured resource candidate set includes 5 PUCCH resource indices, and of the predetermined resource indices (e.g., the last indices) may be defined to be used only in PCell-only reception cases, or resource candidates for PCell-only reception may be defined separately from the four PUCCH resource candidates, hi both cases above, the UE may be allocated a reserved resource index only for PCell-only reception cases (i.e., a resource index not specified by ARI on SCell), here, additional resource candidates for PCell-only reception are preferably not overlapped with four existing RRC-configured resource candidates, but overlap may be allowed in .

Fig. 29 is a flowchart illustrating additional predefined resource allocations determined for PUCCH resources in a PCell-only reception case.

In step S2910, the UE may receive a PUCCH resource candidate set including four resources for PUCCH format 3 through higher layer configuration (e.g., RRC signaling)

In step S2920, when PUCCH format 3 is used for ACK/NACK transmission, the UE may determine whether the situation is a PCell-only reception case. If the determination result in step S2920 is no (i.e., not the PCell-only reception case), step S2830 is performed, and if yes (i.e., the PCell-only reception case), step S2940 is performed.

In step S2930, four PUCCH resource candidates (for example, four low-index PUCCH resources) predetermined according to a prescribed rule from the 5 PUCCH resource candidates are selected

And

) In this case, the UE may use ARI indicated by reuse of TPC fields in or more PDCCHs of the SCell from four PUCCH resource candidates

PUCCH resources to be used by it are calculated/selected.

Meanwhile, since the PDCCH is not received on the SCell in step S2940, the UE may select PUCCH resources according to a predefined ruleThe predefined rule may be for selecting the last resources from the 5 RRC configured PUCCH resource candidates

May define that the rules for determining four out of 5 PUCCH resource candidates in step S2930 do not overlap with the rules for determining out of 5 PUCCH resource candidates in step S2940, however, in some cases , rules may be defined such that overlapping resource candidates are selected.

After step S2930 or step S2940, the UE may transmit ACK/NACK information through PUCCH format 3 using a resource corresponding to the calculated/selected index.

Example 3

Embodiment 3 relates to a method of using Downlink Assignment Index (DAI) for PUCCH resource allocation in a PCell-only reception case, i.e., a case of receiving only or more PDSCHs for PCell or a case of receiving only or more PDCCHs on PCell.

In the above embodiments 1 and 2, a method for deriving a resource index for PUCCH format 3 in PCell-only reception without using additional physical layer signaling (e.g., PDCCH signaling) has been described embodiment 3 relates to methods of defining and using information capable of performing a function of ARI in a physical layer signal received on PCell, although ARI cannot be received on SCell as in the existing scheme, since PDCCH does not exist on SCell.

For example, when a UE transmits ACK/NACK signals for a plurality of DL assignments (PDSCHs) to a BS (bundling using ACK/NACK), a case in which the UE fails to receive (i.e., loses) parts of the plurality of PDCCHs may occur.

In this embodiment, considering the case where the DAI in the PDCCH of PCell is not used for the original purpose when PUCCH format 3 is used, it is proposed to reuse the DAI as an ARI for determining PUCCH resource assignment. Specifically, even though PUCCH format 3 is used in the TDD system, DAI information is not required in operation as an ACK/NACK full multiplexing mode in which time domain bundling or CC domain (or frequency domain) bundling is not performed. Therefore, the DAI field may be reused as an ARI for PCell-only reception.

Fig. 30 is a flowchart illustrating an example of using a DAI field as an ARI for PUCCH resource determination in a PCell-only reception case.

In step S3010, the UE may receive a PUCCH resource candidate set including four resources for PUCCH format 3 through higher layer configuration (e.g., RRC signaling)

In step S3020, when PUCCH format 3 is used for ACK/NACK transmission, the UE may determine whether the situation is a PCell-only reception case. If the determination result in step S3020 is no (i.e., not the PCell-only reception case), step S3030 is performed, and if yes (i.e., the PCell-only reception case), step S3040 is performed.

In step S3030, the UE may calculate/select PUCCH resources (i.e., resource indices) to be used by it from four PUCCH resource candidates using ARI indicated by reuse of the TPC field in or more PDCCHs of the SCell.

Meanwhile, in step S3040, since the PDCCH is not received on the SCell, the UE may select PUCCH resources (i.e., resource indices) to be used by it from among the four PUCCH resource candidates using the ARI indicated by reuse of the DAI field in the PDCCH of the PCell.

After step S3030 or step S3040, the UE may transmit ACK/NACK information through a PUCCH format using resources corresponding to the calculated/selected index.

Example 3-1

Embodiment 3-1 relates to an example of applying the same ARI value in bundled subframes in a PCell-only reception case (i.e., in case of receiving only or more PDSCHs for PCell or or more PDCCHs on PCell).

The term bundling subframe (or bundling window) used in the description of the present invention denotes units consisting of DL subframes when ACK/NACK responses to the DL subframes in the bundling window are transmitted through UL PUCCHs, instead of a unit in which bundling is actually performed in a time domain or a CC domain (or a frequency domain).

For example, in an LTE Release 8TDD system, as in Table 12 above (showing DL correlation set index K: { K:)₀,k₁,…k_M-1}) of DL subframes, a definition is given as to which previous or more DL subframes (subframe n-k) to use to transmit ACK/NACK responses for DL transmissions in a specific UL subframe (subframe n) in describing bundling subframes by way of example of table 12, when ACK/NACK responses for DL transmissions in or more specific DL subframes are transmitted in a specific UL subframe, these or more specific DL subframes are referred to as bundling subframes.

Here, when or more PDCCHs are detected in multiple DL subframes in a PCell-only reception case according to embodiment 3, if ARI (or DAI) values indicated by the corresponding PDCCHs are different, it is unclear which ARI value is used for calculating/selecting a PUCCH resource.

To prevent this problem, the ARI value (i.e., the value of the DAI field) of the PDCCH transmitted on the PCell in the bundled subframe should be maintained identically.

Examples 3 to 2

This embodiment may also be applied to a PCell-only reception case, which may include a case in which the UE cannot detect DL transmission on or more scells and receives DL transmission only on the PCell, although the BS has performed DL transmission on the PCell and or more scells.

The term bundling subframe (or bundling window) used in the description of the present invention denotes units consisting of DL CCs when ACK/NACK responses to DL CCs in the bundling window are transmitted through UL PUCCHs regardless of presence/absence of bundling, instead of actually performing units for bundling in a time domain or a CC domain (or a frequency domain).

Here, the meaning of 'transmitting ACK/NACK responses for multiple DL CCs' may indicate that there is DL transmission in PCell and or more scells, at this time, if ARI values in PDCCH of PCell are different from ARI values in PDCCH of SCell, it is unclear which ARI value is used to calculate/select PUCCH resource.

Therefore, in order to prevent the above problem, the value of a field for ARI purpose (DAI field) on the PCell and the value of a field for ARI purpose (TPC field) on the SCell should be maintained identically.

Examples 3 to 3

Embodiment 3-3 relates to an example of applying the same ARI value in bundling CCs and subframes.

When both embodiments 3-1 and 3-2 are considered (e.g., when the multiple CCs and the multiple subframes are bundling units), the calculation/selection of PUCCH resources may not be clear if the ARI values in the corresponding cells or the corresponding subframes are different.

Example 4

Embodiment 4 relates to methods of using the TPC field for PUCCH resource allocation in the PCell-only reception case (i.e., the case of receiving only or more PDSCHs for the PCell or the case of receiving only or more PDCCHs on the PCell).

In the above embodiment 3, a method for determining a resource index of a PUCCH resource (e.g., a resource of PUCCH format 3) even in PCell-only reception without using additional physical layer signaling has been described. Embodiment 3 relates to an example of using DAI for ARI purpose when it is not used as original purpose (purpose of sequentially assigned index for DL allocation (or PDSCH scheduling)). Therefore, when PUCCH format 3 is used in a TDD system, if time domain bundling or CC domain (or frequency domain) bundling is supported, DAI information is required for an original purpose in order to generate correct ACK/NACK information.

Therefore, in embodiment 4, the DAI is not used for other purposes in the PCell-only reception case, embodiment 4 proposes methods of reusing the TPC field in or more PDCCHs on the PCell as the ARI in the PCell-only reception case.

In the non-PCell-only reception case (i.e., there is PDCCH transmission on the SCell), the TPC field on the SCell is reused for ARI as described above. However, in the PCell-only reception case, since there is no transmission of the TPC field on the SCell, a new method for transmitting correct ACK/NACK must be defined.

According to embodiment 4, in a PCell-only reception case, a TPC field of or more specific PDCCHs determined according to a predetermined rule on the PCell may be used for original transmission power control purposes and a TPC field of or more additional PDCCHs may be used for ARI purposes the UE may use only the TPC field of or more specific PDCCHs determined according to a predetermined rule on the PCell for original power control purposes, and upon reception of other or more PDCCHs on the PCell, the UE may interpret the TPC field of or more corresponding PDCCHs as ARI.

However, the TPC value in the PDCCH is not an absolute value but a relative offset value with respect to the previous transmission power, and also, a preset transmission power can be maintained even though the UE does not update times or twice the TPC value.

In applying the present invention, the TPC field of or more PDCCHs on the PCell according to a predetermined rule may be used for an original purpose (power control purpose).

As a th example, a TPC field of a PDCCH transmitted in an nth subframe of a bundled subframe may be defined for an original purpose, where n may be a value indicating a part or more subframes in the bundled subframe, for example, if of the bundled subframe is indicated, n may be determined as a value indicating a 0 th subframe or a last th subframe, and n may be differently determined according to the number of bundled subframes (or the size of the bundled subframes) in a similar manner as shown in Table 12, the number of bundled subframes may be, for example, 1, 2, 3, 4, or 9, or different numbers of subframes may be bundled according to a newly defined bundling scheme.

As a second example, a TPC field in a PDCCH having an nth DAI value in a bundled subframe may be defined for an original purpose.here, n may be 0,1, 2, 3,. 9. or values that may be determined if the DAI value is interpreted as 1, 2, 3, 4,. in this case, even in an ACK/NACK full multiplexing mode (where time domain or CC domain (or frequency domain) bundling is not applied), the DAI field may be included in or more PDCCHs on the PCell.

In the second example above, the DAI value may represent a consecutive (sequential) counter for or more PDCCHs allocated to the UE in a two-bit size the actually transmitted value of the DAI field may be of 0,1, 2, and 3 (or 00, 01, 10, and 11 when expressed as a 2-bit value) that may be interpreted by the UE as DAI values 1, 2, 3, and 4.

The actually transmitted value of the DAI field may be 0,1, 2, or 3, and the UE may interpret the value as th, second, third, or fourth PDCCH in which case, with respect to the actually transmitted DAI value, n-0 (in the set of 0,1, 2, and 3) in a specific UE indicates th PDCCH.

The actually transmitted value of the DAI field may be 0,1, 2, or 3, and the UE may interpret the value as th, second, third, or fourth PDCCH in which case, with respect to the DAI value interpreted by the UE, n ═ 1 (in the set of 1, 2, 3, and 4) in a particular UE indicates the th PDCCH.

In summary, the actual DAI values 00, 01, 10, and 11 included in the PDCCH may be mapped to DAI values 1, 2, 3, and 4, respectively, interpreted by the UE.

As described in the above example, the TPC field in or more PDCCHs in the nth subframe or or more PDCCHs where DAI ═ n determined by the value of n is used for the original purpose (power control), and the TPC field in the other or more PDCCHs may be reused as ARI.

In the example of fig. 31, it is assumed that TPC fields of specific PDCCHs determined according to a predefined rule are used for an original purpose, and TPC fields of other or more PDCCHs are reused as ARIs.

In step S3110, the UE may receive a PUCCH resource candidate set including four resources for PUCCH format 3 through higher layer configuration (e.g., RRC signaling)

In step S3120, when PUCCH format 3 is used for ACK/NACK transmission, the UE may determine whether the situation is a PCell-only reception case. If the determined result in step S3120 is no (i.e., not the PCell-only reception case), step S3130 is performed, and if so (i.e., the PCell-only reception case), step S3140 is performed.

In step S3130, the UE may calculate/select PUCCH resources (i.e., resource indexes) to be used by it from four PUCCH resource candidates using ARI indicated by reuse of TPC fields in or more PDCCHs of the SCell.

Meanwhile, in step S3140, the UE may determine whether the number of received PDCCHs is 1. Since step S3140 is performed when the PDCCH is not received on the SCell, the number of received PDCCHs indicates the number of PDCCHs received on the PCell. If the determination result in step S3140 is yes (i.e., the number of PDCCHs received on the PCell is 1), step S3150 is performed, and if the determination result in step S3140 is no (i.e., the number of PDCCHs received on the PCell is greater than 1), step S3160 is performed.

In step S3150, if the UE receives only PDCCHs on the PCell, the UE may use the TPC field of the PDCCHs for original purposes (power control), and since there is no other PDCCH, the UE may determine that an ARI value is not received.

Meanwhile, since step S3160 is performed when the number of PDCCHs received on the PCell is greater than 1, the UE may use the TPC field in of the PDCCHs for original usage purposes and may interpret the TPC fields of other or more PDCCHs as being used for ARI.

After step S3130 or step S3160, the UE may transmit ACK/NACK information through PUCCH format 3 using a resource corresponding to the calculated/selected index.

In the illustrated example of fig. 31, the explanation has been given under the following assumption: the UE views only the number of received (or detected) PDCCHs, and when the number of received PDCCHs is 1, the TPC field of the corresponding PDCCH is used for the original purpose.

However, if the number of received PDCCHs is 1, the TPC field of the PDCCH may be used for an original purpose or may be reused for an ARI purpose. Therefore, when the number of received PDCCHs is 1, the fallback mode operation is not always performed, and it is preferable to perform detailed determination.

Fig. 32 is a flowchart illustrating another examples of using a TPC field as an ARI for PUCCH resource determination in case of PCell-only reception, in the example of fig. 31, it is assumed that the TPC fields of specific PDCCHs determined according to a predefined rule are used for an original purpose, and the TPC fields of other or more PDCCHs are reused as an ARI.

In the illustrated example of fig. 32, the description of the same operations (steps S3210, S3220, S3230, and S3240) as those of fig. 31 is omitted.

When the determination result of step S3240 is yes (i.e., when the number of PDCCHs received on the PCell is 1), step S3250 is performed in step S3250, it is determined whether the received PDCCHs are predefined PDCCHs (i.e., whether the TPC field of the PDCCHs is used for the original purpose). for example, whether the received PDCCH is a PDCCH in the th subframe of the bundling subframe may be determined as another example, whether the received PDCCH is a PDCCH having a DAI value of 1 (hereinafter, DAI ═ 1). if the determination result is yes, step S3260 is performed, and if not, step S3270 is performed.

In step S3260, since the TPC field in the received PDCCHs should be used for the original purpose, the UE may regard the ARI as unknown and may operate in the fallback mode (ACK/NACK transmission using PUCCH format 1a/1 b).

Step S3270 may be performed when the result of step S3240 is no, i.e., if the number of received PDCCHs is greater than 1, since it is assumed that there are only PDCCHs in which the TPC field is used for the original purpose, the UE may recognize that at least TPC fields of the PDCCHs are reused as ari.the UE may calculate/select PUCCH resources (i.e., resource indexes) to be used by the UE among the four PUCCH resource candidates using ARI values from the TPC fields of the corresponding PDCCHs.

When the determination result of step S3250 is no, step S3270 may also be performed, that is, if the number of received PDCCHs is 1, the UE may recognize that the TPC field of the corresponding PDCCHs is reused for ARI because the corresponding PDCCH is not a PDCCH in which the TPC field is used for the original purpose, the UE may calculate/select PUCCH resources (i.e., resource indices) to be used by the UE among the four PUCCH resource candidates using the ARI value from the TPC field of the corresponding PDCCH.

In step S3270, the UE may transmit ACK/NACK information through PUCCH format 3 using resources corresponding to the calculated/selected index.

Example 4-1

Embodiment 4 relates to an example of applying the same ARI value in bundled subframes in case of PCell-only reception (i.e., in case of receiving only or more PDSCHs for PCell or or more PDCCHs on PCell).

The term bundling subframe (or bundling window) used in the description of the present invention denotes units consisting of DL subframes when ACK/NACK responses to DL transmissions in the DL subframes in the bundling window are transmitted through UL PUCCHs, instead of a unit in which bundling is actually performed in a time domain or a CC domain (or a frequency domain).

For example, in an LTE Release 8TDD system, as in Table 12 above (showing DL correlation set index K: { K:)₀,k₁,…k_M-1}) of the DL wireless communication system, a definition is given as to which previous or more DL subframes (subframe n-k) are used for transmitting ACK/NACK responses for the DL wireless communication system in a specific UL subframe (subframe n.) in describing bundling subframes by way of an example of table 12, when ACK/NACK responses for DL transmissions in specific or more DL subframes are transmitted in a specific UL subframe, the specific or more DL subframes are referred to as bundling subframes.

Here, according to embodiment 4 described above, multiple PDCCHs are detected in multiple DL subframes with PCell-only reception, if ARI (or TPC) values indicated by PDCCHs having a TPC field reused as ARI are different, it is ambiguous which ARI value is used for calculating/selecting PUCCH resources.

Here, in addition to a PDCCH having a TPC field determined to be used for an original purpose according to a predefined rule, for example, a PDCCH having DAI ═ 1, a PDCCH having a TPC field reused as an ARI may correspond to a PDCCH (for example, a PDCCH having a DAI value greater than 1 (hereinafter, referred to as DAI > 1)).

Therefore, in order to prevent this problem, the ARI value (i.e., the value of the TPC field) of a PDCCH having a TPC field reused as an ARI (i.e., a PDCCH other than the PDCCH having the TPC field for the original purpose), which is transmitted on the PCell in a bundled subframe, should be equally maintained.

Example 4 to 2

Embodiment 4-2 relates to an example of applying the same ARI value on bundled CCs.

The term bundled CC (or bundling window) used in the description of the present invention means units consisting of DL CCs when ACK/NACK responses to DL CCs in the bundling window are transmitted through UL PUCCHs, regardless of the presence/absence of bundling, instead of actually performing the bundling in a time domain or a CC domain (or a frequency domain).

Here, the meaning of transmitting ACK/NACK responses for a plurality of DL CCs may correspond to a case where DL transmission is present on PCell and or more scells.

Therefore, in order to prevent such a problem, a value of a field (TPC field) used as an ARI on the PCell and a value of a field (TPC field) used as an ARI on the SCell should be equally maintained.

Here, the ARI value on the PCell and the ARI value on the SCell may be maintained equally with the ARI value of a PDCCH (e.g., a PDCCH with DAI >1) other than a PDCCH determined to use the TPC field for the original purpose PDCCH (e.g., a PDCCH with DAI ═ 1) according to a predefined rule.

Examples 4 to 3

Embodiment 4-3 relates to an example of applying the same ARI value in bundled CCs and subframes.

That is, when the above-described embodiments 4-1 and 4-2 are considered simultaneously (e.g., when a plurality of CCs and a plurality of subframes become bundling units), it may be ambiguous to calculate/select a PUCCH resource if ARI values in the corresponding cells or the corresponding subframes are different.

Here, on the PCell, ARI values for PDCCHs (e.g., PDCCHs with DAI >1) other than a PDCCH (e.g., a PDCCH with DAI ═ 1) determined to use the TPC field for an original purpose according to a predefined rule may be equally maintained.

Fig. 33 is a diagram illustrating an embodiment of using a TPC field for an original purpose or ARI purpose according to a DAI value on a PCell.

The DAI field value is used as an accumulation counter of PDCCHs per cells, i.e., the DAI value is sequentially increased by 1 in every PUCCHs of cells.

In the illustrated example of fig. 33, there are PDCCHs for DL allocation in th and third subframes on the PCell, the DAI value is 0 in the PDCCH of th subframe and 1 in the PDCCH of the third subframe, the DAI values are sequentially given in the PDCCH for DL allocation on the SCell in fig. 33, the DAI values 0,1, 2, 3, … are illustrated, but have the same meaning as the DAI values 1, 2, 3, 4, … from the viewpoint of the UE.

For example, the TPC field in a PDCCH in which the DAI value on the PCell is 0 (or 1 from the viewpoint of the UE), that is, the TPC field in a PDCCH in th subframe of the PCell in FIG. 33 is used for the original purpose (i.e., power control), and the TPC fields in another PDCCHs on the PCell are reused for the ARI purpose.

For example, if the bundling window is applied over four subframes and five cells in the illustrated example of fig. 33, the UE may assume that the values of the TPC fields of the PDCCHs on the PCell and the SCell (i.e., the TPC fields for ARI purposes) are the same, except for the TPC field in the th subframe of the PCell (where DAI is 0).

Example 5

Embodiment 5 relates to a method for PUCCH resource allocation using a TPC field in a PCell-only reception case (i.e., a case of receiving only or more PDSCHs for a PCell or a case of receiving or more PDCCHs on a PCell).

The DAI field is basically used for the original purpose (i.e., an accumulation counter for PDCCH on every cells) as in embodiment 4 above, and the TPC field in the PDCCH may be reused as ari in which case the TPC field of a predetermined specific PDCCH is used for the original purpose.

The above example of fig. 31 or 32 can be applied substantially identically to embodiment 5 as a basic operation, and the duplicate explanation that has been given in embodiment 4 above is omitted.

Hereinafter, a detailed method of using the TPC field for an original purpose or ARI purpose based on a DAI value when partial ACK/NACK bundling is applied will be described.

First, a TPC field in a PDCCH having an nth DAI value in a bundling subframe of a PCell may be defined for an original purpose. The value of the DAI field may be given as 0,1, 2, 3, … or may be given as 1, 2, 3, 4,.. from the UE's point of view.

In this case, in the ACK/NACK partial bundling mode, which is applied to time-domain bundling or CC-domain (or frequency-domain) bundling, a DAI field may be included in or more PDCCHs on the PCell.

When ACK/NACK partial bundling is applied, if a TPC field in a PDCCH of DAI ═ n is used for an original purpose (power control), DAI fields of or more PDCCHs may be determined in various ways as follows.

In the legacy (LTE release 8) TDD mode, the DAI indicates an accumulated value of PDCCHs allocated to a UE, and if the DAI is simply applied to a multi-carrier environment, the DAI may be used as an accumulated value of PDCCHs allocated to the UE over all cells (or CCs). For example, such as

As shown in fig. 34, when ACK/NACK bundling is applied in four subframes and on two CCs, a DAI value may be determined such that the DAI value increases in a direction in which a CC index increases in a bundling window.

Fig. 35 is a diagram illustrating an example of determining a DAI value in a CA TDD system.

As an example, the DAI value may indicate an accumulated number of PDCCHs allocated to the UE in a plurality of subframes per cells (fig. 35 (a)). for example, such a method for determining the DAI value is preferably used when bundling is applied in the time domain, the accumulated number of PDCCHs may be applied in a manner of counting PDCCHs in all subframes in radio frames, or the accumulated number of PDCCHs may be applied in a manner of counting PDCCHs in an actual bundling window (a unit for actually performing ACK/NACK bundling) in the time domain, in the example of fig. 35(a), DAIs in PDCCHs in three subframes in an actual bundling window of a unit of four subframes on SCell #2 are determined to be 0,1, and 2, and this is an example of using the DAI field as an accumulation counter for indicating that corresponding PUCCHs are , second PDCCH, and third PDCCH, respectively.

As another examples, the DAI value may indicate the total number of PDCCHs allocated to the UE on multiple CCs (or cells) per subframes (fig. 35 (b)). for example, such a DAI value determination method is preferably used when partial bundling is applied in the CC domain. the total number of PDCCHs may be determined as the number of PDCCHs in all CCs configured for the UE. alternatively, the total number of PDCCHs may be determined as the number of PDCCHs in an actual bundling window (a unit for actually performing ACK/NACK bundling) in the CC domain. in the example of fig. 35(b), the DAI value in a PDCCH in the th subframe is 2, and this is an example of using a DAI field as an indicator for indicating that the total number of PDCCHs in a corresponding subframe is 3.

For example, in an example of fig. 35(b), the DAI value in the third subframe is determined as DAI 0 on PCell, DAI 1 on SCell #2, DAI 2 on SCell #3, and DAI 3 on SCell # 4.

As shown in fig. 35(a), if DAI is used as an accumulation counter of PDCCHs allocated in an actual bundling window in the time domain (i.e., if DAI values are reset on every CCs), an embodiment of the present invention for ARI purpose using TPC fields of PDCCHs on a PCell and a plurality of scells in addition to a PDCCH having a specific DAI value on the PCell (e.g., DAI ═ 0) may be equally applied.

Meanwhile, as shown in fig. 35(b), if DAI is used as the total number (or an accumulation counter) of PDCCHs allocated in an actual bundling window in a CC domain (or frequency domain), it may be difficult to apply an embodiment of the present invention for ARI purposes using TPC fields of PDCCHs on a PCell and a plurality of scells in addition to a PDCCH having a specific DAI value (e.g., DAI ═ 0) on the PCell.

For example, it may be assumed that PDCCHs are allocated to a specific UE in th and second subframes and PDCCHs are not allocated on scells although this case corresponds to PCell-only reception, the DAI value of the PDCCH received by the UE is the same in both subframes (e.g., DAI ═ 0) (if the DAI field is used as an indicator or an accumulation counter of the total number of PDCCHs in the corresponding subframe, the DAI value is 0 according to the above assumption).

To solve the above problem, different DAI value determination methods may be applied on the PCell and the SCell. For example, on the SCell, the DAI may be used as an accumulation counter of PDCCHs allocated in an actual bundling window in a frequency domain (or CC domain), and on the PCell, the DAI may be used as an indicator (or accumulation counter) of a total number of PDCCHs allocated in the actual bundling window in a time domain.

Therefore, the DAIs of or more PDCCHs on the PCell may be used as the accumulation counters of PDCCHs allocated in an actual bundling window in the time domain, and the DAIs of or more PDCCHs on the SCell may be used in the same or different manner as the DAIs used on the PCell.

In an example of the present invention, which will be described below, it is assumed that the DAI field of the PDCCH is used as follows.

First, a DAI field in a PDCCH may be used as an accumulation counter of a PDCCH allocated in a plurality of subframes in a bundled view of every CCs, i.e., a DAI value is independently determined on every CCs, here, bit values of 0,1, 2, and 3 of the DAI field indicate accumulation counts of 1, 2, 3, and 4, respectively, i.e., bit values expressed as 0,1, 2, and 3 from the viewpoint of the DAI field may also be expressed as 1, 2, 3, and 4 from the viewpoint of the DAI value interpreted by a UE.

The bit values of 0,1, 2, and 3 of the DAI field may indicate the total numbers of 1, 2, 3, and 4, respectively, i.e., the bit values expressed as 0,1, 2, and 3 from the viewpoint of the DAI field may also be expressed as 1, 2, 3, and 4 from the viewpoint of the UE.

Fig. 36 to 39 illustrate various examples of DAI fields used in CC domain bundling in the examples of fig. 36 to 39, 5 CCs configured for a UE and 4DL-1UL configuration in TDD (i.e., collecting ACK/NACK responses for DL transmission in four DL subframes to transmit responses through PUCCH of UL subframes) are illustrated, in addition, in the illustrated examples of fig. 36 to 39, a bundling window includes 5 CCs and four subframes.

Fig. 36 illustrates an example in which CC domain bundling is not applied on a PCell (the maximum size of an actual bundling window in the CC domain is 4) — in this case, a DAI field of the PCell is used as an accumulation counter of PDCCHs allocated to subframes on the PCell.

Fig. 37 illustrates an example in which CC domain bundling is not applied on a PCell (the maximum size of a CC domain actual bundling window is 4). in this case, a DAI field of the PCell is used as an accumulation counter of PDCCHs allocated to subframes on the PCell.

For example, in the illustrated example of fig. 37, if a DAI value in PDCCH detected by the UE on the SCell in the second subframe is 2, the UE can recognize that the total number of PDCCHs allocated on the PCell and the scells is 3. here, it may be assumed that the UE does not receive the PDCCH in SCell # 2. in this case, it cannot be determined whether the not-received PDCCH is a PDCCH in an actual bundling window (i.e., on the SCell) or a PDCCH in a window other than the actual bundling window (i.e., on the PCell) only by the DAI value on the SCell.

Fig. 38 illustrates an example in which CC domain bundling is applied regardless of a PCell or SCell (the maximum size of a CC domain actual bundling window is 5) — in this case, a DAI field of a PCell is used as an accumulation counter of PDCCHs allocated to subframes on the PCell.

Fig. 39 illustrates a case in which a maximum size of a CC field actual bundling window is 2, at this time, CC field bundling is not applied on a PCell, and two actual bundling windows having a maximum size of 2 may be configured on four scells, a DAI field of the PCell is used as an accumulation counter of PDCCHs allocated to subframes on the PCell, a DAI field of the SCell may be used as an indicator of the total number of PDCCHs allocated on the SCell (up to two scells) in an actual bundling window, except for the PCell in every subframes.

ACK/NACK partial bundling (bundling in the time or frequency domain) is applied to embodiment 5, and even in this case, when ARI (═ TPC field) values in a bundling window are different, an ACK/NACK bundling operation may not be clear.

Accordingly, in the PCell-only reception case, the ARI value of a PDCCH in which the TPC field on the PCell is reused for ARI purpose (i.e., except for a PDCCH in which TPC is used for original purpose) in the bundled subframe can be equally maintained. In addition, on a bundled CC, the value of a field for ARI purpose (═ TPC field) on the PCell can be maintained equal to the value of a field for ARI purpose (═ TPC field) on the SCell. Also, on the bundled CC and the subframe, ARI values of PDCCHs (e.g., PDCCHs with DAI >1) other than a PDCCH determined to use the TPC field for an original purpose according to a predefined rule (e.g., a PDCCH with DAI ═ 1) can be equally maintained on the PCell. In connection with this, the principle of the present invention described in embodiments 4-1 to 4-3 above can be applied to embodiment 5 in the same manner. For clarity, the description of the overlapping parts is omitted.

UL ACK/NACK transmission for DL SRS transmission in multi-carrier support systems

LTE release 8 systems support SPS. If DL SPS transmission is activated, time/frequency resources for SPS transmission may be pre-allocated through the PDCCH, and a PDSCH without a corresponding PDCCH may be transmitted through the allocated resources.

The ACK/NACK feedback related to SPS may be divided into two types, type is to transmit ACK/NACK feedback in subframe n for 'PDCCH indicating DL SPS release detected by UE in or more n-k, another type is to transmit ACK/NACK feedback in subframe n for' PDSCH transmission without corresponding PDCCH within or more subframes n-k. type corresponds to the case where ACK/NACK feedback for the PDCCH is transmitted in the nth subframe if PDCCH is present in the nth-k subframes (where k may be or more values). the second type corresponds to the case where ACK/NACK feedback for the corresponding SPS transmission is regularly transmitted in the nth subframe if transmission is received in the nth-k subframes without additional PDCCH after SPS activation.

To solve such a problem, in the LTE rel-8 system, a PUCCH resource index set (e.g., sets composed of four PUCCH resource indexes) for a case where only 'PDSCH transmission without corresponding PDCCH' (i.e., SPS PDSCH transmission) exists is previously indicated by RRC signaling in the LTE rel-8 system, and whether to use a PUCCH resource index set is determined by PUCCH fields in the PDCCH indicating activation or not is defined in the following TPC resource table for SPS resource indexes 14, which shows that

And the value of the TPC field.

[ Table 14]

If the above-described DL SPS transmission is performed in the multi-carrier support system, an ACK/NACK transmission method considering the DL SPS transmission must be provided.

Various embodiments of the present invention are described on the premise that, similar to embodiments 4 and 5 described above, the TPC field of the th PDCCH (PDCCH with DAI ═ 1(DAI ═ 1, 2, 3, 4, …)) for the PCell of a specific UE is used for power control purposes for the original purpose, and the TPC fields of the other or more PDCCHs are used for ARI purposes.

Here, if detected PDCCHs are -th PDCCHs (e.g., a PDCCH with DAI ═ 1), since the TPC field of the PDCCHs is used for the original purpose, this is the case when the UE does not receive ARI information, the UE cannot determine the resource index for PUCCH format 3.

In the following description, ACK/NACK transmission is required in of the following three cases, in summary, case 1 is ACK/NACK for 'PDSCH with PDCCH', case 2 is ACK/NACK for 'DL SPS Release PDCCH', and case 3 is ACK/NACK for 'DL SPS PDSCH'.

Case 3 may be referred to as 'PDSCH without corresponding PDCCH', ACK/NACK for 'SPS without PDCCH', or simply ACK/NACK for 'SPS'. In case 1, a PDCCH of 'PDSCH with PDCCH' may be referred to as 'PDCCH corresponding to PDSCH'.

Example 6

Embodiment 6 relates to a method for transmitting an ACK/NACK response always using PUCCH format 3.

Indication to the UE by RRC signalingPUCCH format 3 resource index set for SPS only. For example, the UE may be provided with information regarding the UE to be controlled in the form shown in table 13 above

And

information of the constructed set. In addition, which resource index of the PUCCH format 3 resource index set is to be used may be specified by a TPC field in the PUCCH for indicating SPS activation.

As an example, when ACK/NACK feedback is required only for SPS without PDCCH, a specific PUCCH format 3 resource index indicated by the SPS activation PDCCH in the set of RRC configurations may be selected and used. That is, ACK/NACK for only SPS without PDCCH may be transmitted using PUCCH format 3.

As another examples, the following method may be applied to a case where ACK/NACK feedback is required for 'SPS without PDCCH' and ' PDSCH with PDCCH'.

The th method is to select and use a PUCCH format 3 resource index indicated by the SPS activation PDCCH, that is, an ACK/NACK response for 'SPS without PDCCH' and ' PDSCHs with PDCCH' may also be transmitted using PUCCH format 3.

The second method is further -divided into two methods according to whether ARI information is included in 'PDCCHs corresponding to PDSCHs'.

When 'PDCCHs corresponding to PDSCHs' are PDCCHs that do not include ARI information (e.g., PDCCHs in which the th DAI (DAI ═ 1)) the PUCCH format 3 resource index indicated by the SPS activation PDCCH may be selected and used, that is, even if ARI information is not acquired from the 'PDCCH corresponding to PDSCH', ACK/NACK responses for 'SPS without PDCCH' and ' PDSCHs with PDCCH' may be transmitted using PUCCH format 3.

If 'PDCCHs corresponding to a PDSCH' are PDCCHs including ARI information (e.g., no DAI (DAI >1) th PDCCH) (which may be the case when a UE loses a PDCCH having a th DAI), a PUCCH format 3 resource index using an ARI value indicated by a TPC field in the 'PDCCH corresponding to a PDSCH' may be selected and used.

Meanwhile, when a plurality of ACK/NACK feedbacks including ACK/NACK for 'SPS without PDCCH' are transmitted, PUCCH format 3 resource index may be determined by ARI values indicated by TPC fields of second or more PDCCHs on PCell (e.g., or more PDCCHs where DAI >1) or or more PDCCHs on or more scells.

Example 7

Embodiment 7 relates to a method for operating ACK/NACK for transmission of 'only' SPS without PDCCH always in fallback mode here refers to ACK/NACK transmission according to the operation defined in LTE release 8, e.g. using PUCCH format 1a/1b additionally aspect PUCCH format 3 may be used in relation to ACK/NACK transmission for 'SPS without PDCCH' and other DL transmissions (PDSCH with PDCCH).

To this end, a PUCCH format 1a/1b resource index set to be used for transmitting 'SPS only' may be indicated to the UE through RRC signaling. The PUCCH format 1a/1b resource index set may be configured as shown in table 14 or may be configured according to other schemes. When SPS activation is indicated, which index of the PUCCH resource index set is to be used may be specified by a TPC field in the SPS activation PDCCH.

Therefore, in a bundling window including SPS without PDCCH, the BS may use TPC fields of all PDCCHs for ARI purposes without distinguishing between PUCCHs on the PCell, respectively.

In this case, with respect to the PUCCH transmission of ACK/NACK feedback for SPS without PDCCH, the TPC field of PDCCH is not used for the original purpose (UL transmit power control). however, the TPC value in PDCCH is a relative offset value to the previous transmit power, not an absolute value, and the preset transmit power is maintained even if the UE does not update the TPC value times or twice.

According to the example of embodiment 7, when ACK/NACK feedback is required only for SPS without PDCCH, a specific PUCCH format 1a/1b resource index indicated by SPS activation PDCCH of the RRC-configured set may be selected and used. That is, for ACK/NACK only for SPS without PDCCH, fallback mode operation using PUCCH format 1a/1b may be performed.

As another examples, when ACK/NACK feedback for 'SPS without PDCCH' and ' PDSCH with PDCCH' is required, since the TPC fields of all PDCCHs in the bundling window are used for ARI purpose as described above, PUCCH formatted 3 resource indexes may be selected and used according to ARI values indicated by the TPC fields of detected PDCCHs.

Meanwhile, when a plurality of ACK/NACK feedbacks including ACK/NACK for SPS without PDCCH are transmitted, since the TPC fields of all PDCCHs in the bundling window are used for ARI purposes as described above, the PUCCH format 3 resource index may be determined by or more ARI values indicated by the TPC fields of or more PDCCHs on the PCell and/or SCell.

Example 8

Embodiment 8 relates to methods for always performing ACK/NACK for DL transmission including 'SPS transmission without PDCCH' in fallback mode.

To this end, a PUCCH format 1a/1b resource index set to be used for transmission of SPS "only" without PDCCH may be indicated to the UE through RRC signaling. The PUCCH format 1a/1b resource index set may be configured as shown in table 14 or may be configured according to other schemes. When SPS activation is indicated, which index of the PUCCH resource index set is to be used may be specified by a TPC field in the SPS activation PDCCH.

According to the example of embodiment 8, when ACK/NACK feedback for SPS without PDCCH 'only' is required, a specific PUCCH format 1a/1b resource index indicated by the SPS activation PDCCH of the RRC-configured set may be selected and used. That is, for ACK/NACK of SPS without PDCCH only, a fallback mode using PUCCH format 1a/1b may be performed. Here, ACK/NACK feedback for SPS without PDCCH may have a size of 1 or 2 bits according to the number of codewords, and PUCCH format 1a or 1b may be used.

As another examples, ACK/NACK feedback for 'SPS without PDCCH' and ' PDSCH with PDCCH' is required, a specific PUCCH format 1a/1b resource index indicated by the SPS activation PDCCH of the RRC-configured set may be selected and used.

Hereinafter, a detailed example of the present invention when ACK/NACK feedback for 'SPS without PDCCH' and ' PDSCHs with PDCCH' is required will be described.

Example 8-1

Embodiment 8-1 relates to a method of using a channel selection scheme of M-2, 3, or 4 when ACK/NACK feedback for 'SPS without PDCCH' and ' PDSCHs with PDCCH' is required, i.e., the size of the ACK/NACK feedback payload for 'SPS without PDCCH' and ' PDSCHs with PDCCH' is 2 to 4 bits, and in order to transmit ACK/NACK feedback without any loss, a channel selection scheme using 2, 3, or 4 PUCCH formats 1b (or PUCCH formats 1a) may be applied.

Among the plurality of resources for channel selection, PUCCH format 1b (or 1a) resources are derived from a CCE index of 'PDCCH corresponding to PDSCH', and another PUCCH format 1b (or 1a) resources may be indicated by PDCCH for indicating SPS activation.

In addition, if a PUCCH resource (e.g., M ═ 3 or 4) is required further to step , a PUCCH resource corresponding to a value (CCE index + offset) obtained by adding a prescribed offset (e.g., 1) to a CCE index of "PDCCH corresponding to PDSCH" may be used for channel selection.

Alternatively, similar to the above scheme, a channel selection scheme using PUCCH format 1a/1b resource indexes determined explicitly or implicitly from information related to 'SPS without PDCCH' and ' PDSCHs with PDCCH' may be applied.

When the UE determines a PUCCH resource for transmitting ACK/NACK information according to embodiment 8-1, the BS may attempt to receive ACK/NACK information for three cases of a PUCCH format 3 region, a PUCCH format 1a/1b region, and a channel selection (PUCCH format 1b (or 1a)) region.

Since the UE can transmit ACK/NACK information using any of the three cases, the BS should perform blind decoding in the above three cases.

Example 8 to 2

Embodiment 8-2 relates to methods of using a fallback mode using PUCCH format 1b (or 1a) defined in LTE rel-8 using spatial bundling (i.e., ACK/NACK bundling for multiple codewords) when ACK/NACK feedback is required for 'SPS without PDCCH' and ' PDSCH with PDCCH'.

Similarly, when ' PDSCHs with PDCCH' correspond to the transmission of multiple (e.g., 2) codewords, spatial bundling is performed for ACK/NACK responses thereto, if only of 'SPS without PDCCH' and ' PDSCHs with PDCCH' are codeword transmissions and the other are two codeword transmissions, spatial bundling is performed only with respect to the two codeword transmissions.

Therefore, the size of the ACK/NACK payload for 'SPS without PDCCH' and ' PDSCHs with PDCCH' is reduced to 2 bits when spatial bundling is performed, compared to 2 or 4 bits when spatial bundling is not performed.

The 2-bit ACK/NACK feedback may be transmitted through the legacy LTE release 8 PUCCH format 1b (or 1 a). That is, if spatial bundling is performed, the ACK/NACK feedback may be operated in a fallback mode using PUCCH format 1b (or 1a) of LTE release 8.

In this case, PUCCH format 1a/1b resource indexes derived from the CCE indexes of 'PUCCHs corresponding to a PDSCH' may be selected and used, or PUCCH format 1a/1b resource indexes indicated by an SPS activation PDCCH in an RRC-configured resource index set may be selected and used, in other words, the corresponding ACK/NACK responses are backed to PUCCH format 1a and multiplexed by phase rotation, i.e., of two ACK/NACK responses are mapped to an I channel and another are mapped to a Q channel, or two ACK/NACK responses are backed to PUCCH format 1b and multiplexed.

For example, of the two-bit ACK/NACKs used in PUCCH format 1b used in LTE rel-8, the Most Significant Bit (MSB) may be mapped to ACK/NACK for 'SPS without PDCCH', and the Least Significant Bit (LSB) may be mapped to ACK/NACK for ' PDSCHs' with PDCCH (e.g., PDCCH with DAI ═ 1).

As another embodiments, ACK/NACK for ' SPS without PDCCH ' is mapped to I-axis of QPSK constellation and ACK/NACK for ' PDSCH 32 with PDCCH (e.g., PDCCH with DAI ═ 1) may be mapped to Q-axis of QPSK constellation.

For example, when ACK/NACK for ' SPS without PDCCH ' is mapped to I-axis and ' PDSCHs with PDCCH (e.g., PDCCH with DAI ═ 1) are mapped to Q-axis, even if the UE fails to detect PDCCH (i.e., ' PDCCH corresponding to PDSCH '), the BS may receive ACK/NACK responses for at least SPS.

As another examples, '1, 1' and '0, 0' of the QPSK constellation may be mapped to ACK/NACK for 'SPS without PDCCH', and '0, 1' and '1, 0' may be mapped to PDSCH 'ACK/NACK for' PDCCH with PDCCH (e.g., PDCCH with DAI ═ 1).

The above constellation mapping may also be applied regardless of whether spatial bundling is actually applied (i.e., regardless of whether there is a2 codeword transmission).

In the application embodiment 8-2, spatial bundling can be even applied to 'only' ACK/NACK feedback for SPS without PDCCH in this case, the BS should perform blind decoding for three cases, PUCCH format 1a/1b region for ACK/NACK for 'only' SPS, PUCCH format 1a/1b region for ACK/NACK for 'SPS without PDCCH' and ' PDSCHs with PDCCH', and PUCCH format 3 region.

In addition, in application embodiment 8-2, instead of a resource index derived from a CCE index of 'PDCCH corresponding to PDSCH' as a PUCCH resource, a PUCCH resource index designated by an SPS activation PDCCH of a PUCCH resource set configured by RRC may be used, and other parts may be equally applied.

Examples 8 to 3

Embodiment 8-3 relates to a method of applying spatial bundling (i.e., ACK/NACK bundling for multiple codewords) and using a channel selection scheme of M-2 when ACK/NACK feedback for 'SPS without PDCCH' and ' PDSCHs with PDCCH' is required this may be expressed as a fallback mode operation using the channel selection scheme of LTE release 8 when using the channel selection scheme for PUCCH format 1b (or 1a) defined in LTE release 8.

Similarly, in case of transmission of a plurality of (e.g., two) codewords for 'SPS without PDCCH', spatial bundling is performed for ACK/NACK responses thereto, if of 'SPS without PDCCH' and 'PDSCH 42 with PDCCH' is codewords and another is two codewords, spatial bundling is performed only for transmission of two codewords.

Accordingly, the size of the ACK/NACK payload for 'SPS without PDCCH' and ' PDSCHs with PDCCH' is reduced from 2 or 4 bits when spatial bundling is not performed to 2 bits when spatial bundling is performed.

The 2-bit ACK/NACK feedback may be transmitted through PUCCH format 1b (or 1a) of legacy LTE release 8. Here, a channel selection scheme using M ═ 2 of PUCCH1b (/1a) may be used. That is, 2-bit ACK/NACK feedback as a result of performing spatial bundling may be transmitted using a fallback mode of PUCCH format 1b (1 a).

Here, M ═ 2 may indicate transmission of two kinds of ACK/NACK information (2-bit ACK/NACK information) as a result of spatial bundling, or may indicate channel selection using two PUCCH resources. Accordingly, the detection performance of the BS can be improved by using channel selection.

Among the two PUCCH resources for channel selection, th PUCCH resource may use PUCCH format 1a/1b resource index designated by the SPS activation PDCCH, and the second PUCCH resource may use PUCCH format 1a/1b resource index derived from the CCE index of 'PDCCH corresponding to PDSCH'. contrary to the above example, th and second PUCCH resources may be mapped to PUCCH resource index designated by the SPS activation PDCCH and PUCCH resource index derived from the CCE index of 'PDCCH corresponding to PDSCH'. ACK/NACK information can be transmitted by a channel selection scheme of which selects two PUCCH format 1b (or 1a) resources.

In the present embodiment, the channel selection mapping relationship between ACK/NACK information and PUCCH resources may be configured as shown, for example, in table 5 or table 8. However, this is merely exemplary, and a new channel selection mapping relationship may be defined and used.

As an example of this embodiment, it is assumed that a channel mapping relationship using the PUCCH format 1b is given as shown in table 5. In two PUCCH resources for channel mapping (f:)

And

) In the method, a PUCCH resource designated by the SPS activation PDCCH may be mapped to

And, PUCCH resources derived from CCE index of 'PDCCH corresponding to PDSCH' may be mapped to

Such a mapping configuration may be determined regardless of a reception order (reception time) of 'SPS without PDCCH' and 'PDSCH corresponding to PDCCH'. For example, even when a particular UE is losingWhen a PDCCH (i.e., 'PDCCH corresponding to PDSCH') is received and only a post-SPS transmit response is received, the UE may also receive an ACK/NACK response for at least the SPS. This is because, when the UE fails to detect the PDCCH, PUCCH resources for ACK/NACK transmission for' SPS without PDCCH

PUCCH resources related to ACK/NACK transmission for SPS 'only' without PDCCH

The same is true. Meanwhile, as a modified example of this embodiment, the corresponding PUCCH resource and DL transmission type (PUCCH or SPS) may be mapped inversely to the above example or may be mapped according to the order of reception times.

As another examples of the present embodiment, in a channel mapping relationship using PUCCH format 1b, ACK/NACK for SPS may be mapped to MSB of 2-bit ACK/NACK (i.e., ACK/NACK for SPS is mapped to -th bit), and ACK/NACK for ' PDSCHs' with PDCCH (e.g., PDCCH with DAI ═ 1) may be mapped to LSB (i.e., ACK/NACK for PDSCH with PDCCH is mapped to second bit), or, even when ACK/NACK for SPS is mapped to I-axis and ACK/NACK for ' PDSCH' with PDCCH (e.g., PDCCH with DAI ═ 1) is mapped to Q-axis, the UE fails to detect PDCCH (i.e., 'PDCCH corresponding to PDSCH'), may receive ACK/NACK response for at least SPS transmission, because when ACK/NACK for 'without PDCCH' is mapped to I-axis in case of PUCCH detection failure, the constellation position when ACK/NACK is mapped to I-axis, the BS may transmit ACK/NACK response to the same constellation as that of the above constellation mapping relationship using BPSK format, or may be performed according to the above constellation mapping relationship.

To ensure that the BS receives ACK/NACK responses at least for SPS, specific information can be mapped to specific PUCCH resources in various ACK/NACK feedback transmission scenarios. For example, the channel selection mapping relationship may be configured such that the PUCCH resources to which ACK/NACK for SPS transmissions is mapped are the same as the PUCCH resources on which ACK/NACK for 'SPS only' transmissions are transmitted.

Table 15 below shows modulation symbols (or constellations) for PUCCH formats 1a and 1b in legacy LTE release 8/9.

[ Table 15]

In table 15, assuming that a value '0' of b (0) is NACK and '1' is ACK, then b (0), a value '00' of b (1) represents ACK/ACK, and '11' represents NACK/NACK, in which case at least preceding bits b (0) have the same modulation symbol as in PUCCH formats 1a and 1b, in other words, b (0) is always 0 in both of two PUCCH formats 1a and 1b when d (0) ═ 1, and is always 1 in both of two PUCCH formats 1a and 1b when d (0) ═ 1, therefore, the BS may receive and detect information on at least preceding bits b (0), even though it is not known whether the received ACK/NACK feedback is transmitted using PUCCH format 1a or 1b, a channel selection relationship may be configured such that ACK/NACK for 'PDCCH-free' uses a PUCCH resource mapped to preceding bits b (SPS), thus enabling reception of at least SPS resources for SPS.

For example, when M is 2, the channel selection mapping relationship shown in table 16 below may be used.

[ Table 16]

In table 16, ACK/NACK for SPS is mapped to HARQ-ACK (0), and ACK/NACK for 'PDSCH with PDCCH' may be mapped to HARQ-ACK (1).

For example, assume that only SPS with codewords is received and 'PDSCH with PDCCH' is not received in this case, ACK/NACK response for SPS can be transmitted using PUCCH format 1 a.

In this case, a PUCCH resource indicated by an SPS activation PDCCH in a PUCCH resource set configured for an SPS higher layer may be used as that of Table 16

In addition, PUCCH resources derived from 'CCE index of PDCCH corresponding to PDSCH' (implicitly by a predetermined rule) may be used as table 16

In this case, the BS should be able to receive an ACK/NACK response for SPS regardless of whether the UE loses 'PDCCH corresponding to PDSCH'.

As described above, if the UE transmits an ACK/NACK response for the SPS, then use

Here, ACK corresponds to a modulation symbol in which b (0) ═ 1 and d (0) ═ 1, and NACK corresponds to a modulation symbol in which b (0) ═ 0 and d (0) ═ 1. Meanwhile, when the UE transmits an ACK/NACK response for the SPS and 'PDSCH with PDCCH', the resource on which the ACK/NACK response for the SPS is transmitted may be confirmed in table 16. Now, the description will be given of the case of using in Table 16Case of 'ACK, NACK/DTX' and 'NACK, NACK/DTX'. The 'ACK, NACK/DTX' corresponds to a modulation symbol in which b (0) b (1) is 11 and d (0) is 1, and the 'NACK, NACK/DTX' corresponds to a modulation symbol in which b (0) b (1) is 00 and d (0) is 1. In summary, in both transmission of an ACK/NACK response only for SPS and transmission of an ACK/NACK response for SPS and 'PDSCH with PDCCH', transmission is using the same modulation symbols (i.e., d (0) ═ 1 for ACK and d (0) ═ 1 for NACK)

ACK/NACK response to SPS in the ACK/NACK transmission of (a). Therefore, the BS can detect that

The above signal timing acknowledges the ACK/NACK response at least for the SPS regardless of whether the BS has received the ACK/NACK response for the SPS or the ACK/NACK response for the SPS and 'PDSCH with PDCCH'.

Meanwhile, in the case of 'ACK, ACK' and the case of 'NACK/DTX, ACK' in table 16, resources derived from the CCE index of 'PDCCH corresponding to PDSCH', that is, using resources derived from the CCE index of 'PDCCH' may be used

To transmit an ACK/NACK response. Is received atAbove, the BS may confirm reception of ACK/NACK responses for 'SPS without PDCCH' and 'PDSCH with PDCCH'.

In the above example, although the PUCCH format 1a has been described for convenience, the same principle of the present invention may be applied to the PUCCH format 1 b.

In the above two cases, ACK/NACK information for SPS is transmitted through the same channel (PUCCH resource) and modulation symbols, more particularly, ACK/ACK, ACK/NACK, NACK/ACK and NACK/NACK for two codewords of SPS become ACK, NACK and NACK according to a spatial bundling result if ACK/NACK responses for SPS and 'PDSCH with PDCCH' are simultaneously transmitted, and the responses are the same as ACK/NACK and NACK/NACK for a channel and modulation symbols for SP-only ACK/NACK response, respectively

In this case, the BS may confirm the ACK/NACK response as the spatial bundling result according to whether or not a previous signal (e.g., b (0)) for at least the SPS is ACK or NACK, regardless of whether or not the BS has received the ACK/NACK response for the SPS or the ACK/NACK response for the SPS and 'PDSCH with PDCCH'.

The above constellation mapping may be equally applied to the case where the transmission mode in each cells is a MIMO mode and other cases constellation mapping may also be applied regardless of whether spatial bundling is actually applied (i.e., regardless of whether there is a2 codeword transmission).

In applying embodiment 8-3, spatial bundling may be applied even to ' only ' ACK/NACK feedback transmission for SPS without PDCCH, in comparison with embodiment 8-1 or 8-2, this case may reduce the number of regions where blind detection should be performed by the BS, more specifically, in the channel selection scheme defined in LTE release 8, the channel selection scheme for M of large value is composed of a superset of the channel selection scheme for M of small value, for example, previous bits (e.g., b (0)) in channel selection of M ═ 2 or transmission of only ACK/NACK has the same result as transmission of 1-bit ACK/NACK using PUCCH format 1a without applying channel selection, therefore, when PUCCH format 1a/1b resource index indicated by SPS activation for ' SPS only ACK/NACK is used as the resource index for channel selection, it is possible to distinguish between the case where channel selection is used and the case where no SPS channel selection is used, the detection of ACK/NACK responses on PDCCH ' region for PDCCH ' detection and the PDCCH ' detection of ACK/NACK response on PUCCH format 1a PDCCH ' may be performed for detection of only ACK/NACK channel detection in PDCCH ' 3 ' detection.

Hereinafter, a detailed application example of embodiment 8-3 will be described.

Example 8-3-1

As described above, the ACK/NACK response is generated with respect to three cases. Case 1 relates to a PDSCH with a corresponding PDCCH, case 2 relates to a PDCCH for indicating DL SPS release, and case 3 relates to a PDSCH without a corresponding PDCCH. Case 3 is also referred to as ACK/NACK for SPS PDSCH.

In the description of the present embodiment, for the 'PDCCH' indicating case 1 or case 2 and the 'SPSPDSCH' indicating case 3 of the ACK/NACK response, an operation is described in which a specific UE performs DL reception for the above three cases and performs ACK/NACK for DL reception. The ACK/NACK response transmitted in the nth UL subframe has a relationship with the ACK/NACK response for DL transmission in the nth-K subframe for the above three cases (where K ∈ K, and K: { K: } K ∈ K₀,k₁,…k_M-1And refer to table 12). The description of the ACK/NACK transmission subframe position will be omitted below.

In this embodiment, in order to support dynamic transmit power caused by TPC commands without reducing performance, a predefined channel selection scheme (defined in LTE release 8 or release 10) over PUCCH format 1a may be used.

A case in which serving cells are configured will now be described first.

In this case, the use of the TPC field is determined as follows.

A 2-bit TPC field in a PDCCH in which DL DAI is 1 is used for a TPC command for an original purpose.

The 2-bit TPC field in the PDCCH in DL DAI >1 is used for ARI purposes. The UE assumes that the ARI value is the same in all PDCCHs in which DL DAI > 1.

In addition, the use of the PUCCH format is determined as follows.

If the UE receives only SPS PDSCH, then LTE release 8 PUCCH format 1a/1b resources are used (i.e., operation in fallback mode).

If the UE receives PDCCHs where DL DAI is 1, LTE release 8 PUCCH format 1a/1b resources are used (i.e., operation in fallback mode).

If the UE receives SPS PDSCH and another PDCCHs with DL DAI ═ 1, a predefined channel selection scheme through PUCCH format 1a (channel selection scheme defined in LTE release 8 and release 10) is used here, the th PUCCH resource is determined by higher layer configuration (e.g., by the resource indicated by the ARI of the SPS PDCCH in the RRC-configured resource set), and the second PUCCH resource is determined based on the number (or index) of the th CCE used for transmission of the corresponding PDCCH (i.e., PDCCH where DL DAI ═ 1).

In other cases, PUCCH format 3 is used as the configured PUCCH format.

Meanwhile, a case in which a plurality of serving cells are configured will now be described.

Here, the use of the TPC field is determined as follows.

A 2-bit TPC field in a PDCCH in which DL DAI ═ 1 on PCell only is used for the TPC command of the original purpose.

The 2-bit TPC field of all other or more PDCCHs on the PCell and or more scells is used for the TPC command for the original purpose the UE assumes that the ARI values are the same in all or more PDCCHs on the PCell and or more scells.

In addition, the use of the PUCCH format is determined as follows.

If the UE receives only SPS PDSCH, then LTE release 8 PUCCH format 1a/1b resources are used (i.e., operation in fallback mode).

If the UE receives PDCCHs where DL DAI is 1, LTE release 8 PUCCH format 1a/1b resources are used (i.e., operation in fallback mode).

Here, the th PUCCH resource is determined by higher layer configuration (e.g., by resources indicated by ARI of the SPS activated PDCCH in the RRC configured resource set (see table 14)) and the second PUCCH resource is determined based on the number (or index) of the th CCE used for transmission of the corresponding PDCCH (i.e., the PDCCH in which DL DAI ═ 1).

In other cases, PUCCH format 3 is used as the configured PUCCH format.

Example 8-3-2

In the description of the present embodiment, 'PDCCH' related to ACK/NACK response indicates case 1 or case 2, and 'SPS PDSCH' indicates case 3, as described in embodiment 8-3-1 above. The term 'PDSCH with DAI ═ 1' or 'PDSCH with DL DAI > 1' means that DL DAI indicated by PDCCH corresponding to PDSCH is 1 or more than 1. The description of the ACK/NACK transmission subframe position will be omitted below.

If the UE receives the SPS PDSCH and the PDCCH with DL DAI ═ 1, the UE cannot know the available PUCCH resources because there is no ARI information. To solve this problem, the following method may be considered.

A case in which channel selection of M-2 in LTE release 8 is used will now be described first.

Here, of the channel selection mapping relationship in LTE release 8 (e.g., tables 5 to 7 above) and the channel selection mapping relationship in LTE release 10 (e.g., tables 8 to 11 above) may be used, and this may be determined by RRC configuration.

In applying LTE rel-8 channel selection, the determination is made by SPS PUCCH resources (i.e. resources indicated by SPS activation PDCCH of a higher layer configured resource set, see table 14)

The value of (c). In addition, HARQ-ACK (0) is an ACK/NACK/DTX response for SPS PDSCH transmission. This is to resolve ambiguity in the case where the UE loses PDSCH with DAI-1 and can certainly transmit ACK/NACK responses for SPS transmissions.

In this case, the TPC field of the PDCCH with DL DAI ═ 1 may be actually used for PUCCH power control. However, in a cell supporting MIMO transmission (or 2 codeword transmission), loss of ACK/NACK bits may occur due to spatial bundling for a PDSCH with DAI ═ 1.

Meanwhile, a case in which PUCCH format 3 is used may be considered.

If the UE receives both the SPS PDSCH and the PDSCH with DL DAI-1, the UE may assume that the TPC field of the PDCCH with DL DAI-1 is used for ARI purposes. The UE may then transmit a 2-bit ACK/NACK (on non-MIMO cells) or a 3-bit ACK/NACK (on MIMO cells) using PUCCH format 3.

In this case, since ACK/NACK bundling is not applied, ACK/NACK bits can be transmitted without loss of ACK/NACK information. Meanwhile, since there is no TPC field for the original TPC command purpose (since the TPC field of the PDCCH having DL DAI ═ 1 is for the ARI purpose), PUCCH power control may be incorrectly performed.

In view of this, the following two methods are proposed for resource allocation for TDD PUCCH format 3 in CA.

In this case, or more TPC fields on the PCell may be used for the original purpose and or more TPC fields on or more SCells may be used for ARI purpose.

The second method is to reuse the resource allocation for TDD PUCCH format 3 when CA is not supported (i.e., in non-CA). Then, the TPC field of the PDCCH with DAI-1 on the PCell may be used for the original purpose, and the TPC fields of all other PDCCHs on the PCell and SCell may be used for the ARI purpose. When the UE receives only the SPS PDSCH or the PDCCH with DL DAI ═ 1 on the PCell, LTE release 8 PUCCH format 1a/1b may be used (i.e., fallback mode operation). LTE release 8 channel selection is used when the UE receives SPS PDSCH and PDSCH with DL DAI ═ 1 but does not receive PDSCH with DL DAI > 1.

ACK/NACK transmission through PUCCH in TDD system

An ACK/NACK bundling method and a resource allocation method in LTE-a (or LTE release 1) are described.

For ACK/NACK feedback in TDD using PUCCH format 3, mode 1 and mode 2 are defined, mode 1 may support ACK/NACK payload sizes up to 20 bits, if the number of indicated ACK/NACK bits exceeds 20, spatial bundling is used, if the number of ACK/NACK bits indicated in mode 1 is less than 20, bundling is not supported, meanwhile, mode 2 is a scheme in which partial bundling (bundling in the time domain or bundling in the CC domain) is applied together with spatial bundling .

When channel selection is applied to ACK/NACK feedback in TDD using PUCCH format 1b, mode a and mode b are defined, mode a is a scheme in which any bundling is not supported when the number of indicated ACK/NACK bits is less than 4, mode b is a scheme in which partial bundling (bundling in the time domain or bundling in the CC domain) is applied with spatial bundling when the number of indicated ACK/NACK bits exceeds 4.

In another aspect , a resource allocation for PUCCH format 3 is defined as follows.A 2-bit TPC field in a PDCCH corresponding to a PDSCH on a PCell is used for a TPC command for an original purpose.A 2-bit TPC field of a PDCCH corresponding to a PDSCH on an SCell is used for an ARI purpose.PUCCH 1a/1b is used by the scheme defined in LTE Release 8 if the PDCCH corresponding to the PDSCH on the SCell and the PDSCH on the PCell are not received.

Hereinafter, an ACK/NACK bundling method and a resource allocation method when there is DL reception only on the PCell will be described.

Example 9

Embodiment 9 relates to spatial bundling in mode 1.

Mode 1 for TDD may support independent ACK/NACK transmission of up to 20 bits. However, if the number of indicated ACK/NACK bits exceeds 20, spatial bundling needs to be applied. Since independent ACK/NACK information is not definitely fed back when spatial bundling is applied, the efficiency of HARQ operation may be reduced, and thus, separate ACK/NACK information needs to be maximally transmitted without bundling. That is, the simple application of spatial bundling to all ACK/NACK bits is undesirable in DL throughput performance. Also, since mode 1 is a scheme of transmitting independent ACK/NACK feedback without change, spatial bundling should be minimally applied. Therefore, it is necessary to perform spatial bundling such that the number of ACK/NACK bits is closest to 20 but less than 20.

A detailed method for performing spatial bundling when the indicated number of ACK/NACK bits exceeds 20 will be described below.

According to a th method, spatial bundling may be applied on all DL subframes in specific CCs, in this way, spatial bundling may be performed throughout all subframes with respect to other CCs until the number of ACK/NACK bits to be actually transmitted is less than 20.

When TDD is configured to 9DL:1UL (i.e., configuration for transmitting ACK/NACK for DL transmission in 9DL subframes in UL subframes, for example, see subframe 2 of UL-DL configuration 5 of table 12), if the number of configured CCs exceeds 2, the ACK/NACK payload size exceeds 20 bits even though spatial bundling is applied to all CCs.

When the TDD configuration is not 9DL:1UL, (N) of codewords having two configurations starting from CC having the last indexes (or highest index) on logical indexes_{configuredDLsubframe}+N_{CW_SF}-9) CC application space bundling. Spatial bundling may be applied to the PCell last (i.e., the PCell may be assigned the lowest logical index). Here, N is_{configuredDLsubframe}Is the number of DL subframes in which ACK/NACK is fed back on CCs N_{CW_SF}Is the total number of codewords for which ACK/nack is fed back on subframes on all DL CCs, i.e., N can be determined as shown in equation 2_{CW_SF}。

[ equation 2]

In equation 2, N_CW,iIs the number of codewords configured on the ith CC.

According to the second method, spatial bundling may be applied on all CCs on specific DL subframes in this way, spatial bundling may be performed throughout all CCs with respect to other DL subframes until the number of ACK/NACK bits to be actually transmitted is less than 20.

The number of bundled ACK/NACK bits is 18, 19 or 20 according to the th or second method described above, the number of ACK/NACK bits when the th or second method is applied is shown in table 17 below according to the number of CCs configured for the UE.

[ Table 17]

The th method may maximally support independent ACK/NACK transmission for the PCell with respect to the second method, and may be simply expressed, if the indicated number of ACK/NACK bits exceeds 20, it is preferable to perform spatial bundling on a CC-by-CC basis (i.e., the th method is applied).

Example 10

In embodiment 10, detailed application examples of mode 2 and mode b described above are described, mode 2 is a scheme in which partial bundling (bundling in the time domain or bundling in the CC domain) is applied together with spatial bundling for ACK/NACK feedback in TDD using PUCCH format 3 mode b is a scheme in which partial bundling (bundling in the time domain or bundling in the CC domain) is applied together with spatial bundling for ACK/NACK feedback in TDD using PUCCH format 1b when channel selection is applied in the case where the indicated number of ACK/NACK bits exceeds 4.

Mode 2 may be advantageously applied to improve ACK/NACK performance for power limited UEs. When comparing FDD supporting ACK/NACK of up to 10 bits with TDD supporting ACK/NACK of up to 20 bits, TDD has smaller UL coverage than FDD. In addition, mode 1 (in which spatial bundling is applied when the indicated number of ACK/NACK bits exceeds 20 and spatial bundling is not applied when the indicated number of ACK/NACK bits is 20 or less) cannot support ACK/NACK feedback when the number of DL CCs exceeds 2 in TDD9DL-1UL configuration. For example, to support ACK/NACK feedback on 5 DL CCs and in TDD9DL-1UL configuration, a total of 45 ACK/NACK bits are required even if spatial bundling is applied. Therefore, to support ACK/NACK feedback at least in TDD9DL-1UL configuration, the above mode 2 for PUCCH format 3 needs to be supported.

Hereinafter, spatial bundling applied to the mode 2 and the mode b will be described in detail.

Example 10-1

In embodiment 10-1, spatial bundling in the time domain is described. In addition to spatial bundling, time domain bundling in this embodiment may also be performed.

Time-domain bundling, which is spatial bundling, may be performed without additionally modifying the 2-bit dai defined in LTE rel-8 on every CCs also, in applying time-domain bundling, time-domain bundling may be simply applied on every CCs without having to consider various forms of CA., i.e., it is sufficient to determine a time-domain bundling method for various cases of CA, since the size of ACK/NACK information bits as a result of application of time-domain bundling is 10 bits, the PUCCH format 3 structure of LTE rel-10 may be used as a PUCCH format to be used for ACK/NACK transmission.

To solve this problem, the DAI value for the last detected PDCCH on every CCs may be input to an ACK/NACK mapper and then encoded.

In the example of fig. 40, ACK/NACK bundling is applied on 4 subframes over every CCs.

In CC of fig. 40, the UE has received a PDCCH with DAI-0 in a th subframe and a PDCCH with DAI-1 in a second subframe, but has not received a PDCCH with DAI-2 in a third subframe, then, since the UE does not know whether a last PDCCHs (DAI-2) have been transmitted, the UE may recognize that all PDCCHs in a time domain bundling window have been received, and in addition, fig. 40 shows a case in which every PDSCHs scheduled through the received PDCCHs are successfully decoded (i.e., ACKs) and as a result, ACKs are generated as bundled ACK/NACK information, along with generated ACK information , the UE may encode the last received DAI value, i.e., DAI-1. the UE encodes and transmits ACK and DAI (DAI-1), and then, the BS may recognize that the UE loses PDCCH (DAI-2).

The time domain bundling operation on the second CC of fig. 40 is similar to that on the th CC the UE may encode the last received DAI value (i.e., DAI-0) with ACK information the BS may recognize that the UE loses the PDCCH (DAI-1) because the UE encodes and transmits ACK and DAI (DAI-0).

In the third CC of fig. 40, the UE receives a PDCCH (DAI ═ 0) in the th subframe and receives a PDCCH (DAI ═ 2) in the third subframe even though the UE does not recognize transmission of a PDCCH (DAI ═ 1) in the second subframe, the UE can recognize that it has lost a PDCCH (DAI ═ 1) by itself because the DAI values of the received PDCCHs are not sequentially increased, although fig. 40 shows a case in which every PDSCHs scheduled by the received PDCCHs are successfully decoded (i.e., ACK), the UE may generate NACK as bundled ACK/NACK information because transmission of PDCCHs is lost.

In the fourth CC of fig. 40, the UE receives only a PDCCH (DAI ═ 0) and generates ACK information upon successfully decoding a PDSCH scheduled by the PDCCH, the generated ACK information may be encoded together with a last received DAI value (DAI ═ 0) .

In the fifth CC of fig. 40, the UE receives only a PDCCH with DAI ═ 0. The UE does not know that a PDCCH with DAI-1 has been transmitted in the fourth subframe. Fig. 40 shows a diagram in which a PDSCH scheduled through a PDCCH received by a UE is not successfully decoded (i.e., NACK). Accordingly, the UE may generate NACK information.

Thus, when time-domain spatial bundling is applied, the 2-bit TDDDAI of LTE release 8 (i.e., as a PDCCH accumulation counter) can be reused on every CCs without modification.

As an example of PUCCH format 3 for the application of mode 2, an ACK/NACK state of every CCs before channel coding may be defined as shown in table 18.

[ Table 18]

Using the ACK/NACK state of table 18, the result of the bundled ACK/NACK coded from the DAI value of the last received PDCCH on every CCs in fig. 40 is expressed as ' 01(DAI ═ 1) ' on the CC, 01(DAI ═ 0) ' on the second CC, 11(NACK) ' on the third CC, ' 00(DAI ═ 0) ' on the fourth CC, and 11(NACK) ' on the fifth CC.

The aggregation of ACK/NACK payloads for 5 CCs before performing channel coding in PUCCH format 3 to which mode 2 is applied is '0100110011'.

The principle of the present invention for the above-described mode 2 can be equally applied to the mode b. For the application of mode b, a relationship between a channel selection mapping relationship (mapping relationship between PUCCH resources and ACK/NACK bits) and a NACK/DAI value may be defined.

Thus, when time domain bundling is used, every ACK/NACK responses on every CCs may be expressed as bundled ACK/NACK information.

Example 10-2

In embodiment 10-2, CC domain space bundling is described. In addition to spatial bundling, time domain bundling in this embodiment may be performed.

In CC-domain bundling, it is preferable to use DAI as an indicator indicating the total number of PDSCHs (or corresponding PDCCHs) scheduled in a bundling window consisting of multiple CCs in subframes, rather than DAI as an accumulation counter of PDSCHs (or corresponding PDCCHs) scheduled in multiple subframes on every CCs as in conventional DAI, because when DAI indicates the total number of PDSCHs (or PDCCHs) per subframes, it is not necessary to provide a solution for the case where the UE discards the last PDCCHs in time.

Then, the UE may transmit an ACK when the number of ACKs generated for DL transmissions successfully decoded in the bundling window is equal to the total number of PDSCHs (or PDCCHs) in the bundling window, and otherwise, the UE transmits a NACK (at this time, DTX is expressed as a NACK).

Hereinafter, the application of CC domain bundling to mode b and mode 2 will be described in detail.

Channel selection for applying CC field bundling to mode b is described with reference to fig. 41.

In this case, generally assumes that the channel selection mapping relationship of LTE release 10 (e.g., tables 8 to 11 above) is applied.

If an ACK/NACK PUCCH resource that is implicitly determined (i.e., derived from the CCE index of the PDCCH) is used, a PUCCH resource that is dynamically linked with a PDCCH for scheduling on the PCC (or PCell) may first be selected in every subframes.

ACK/NACK resource mapping in LTE release 8 (e.g., tables 5 to 7 above) may be applied if PDSCH is scheduled only on PCC (or PCell) in a multi-CC configuration. That is, the operation of the fallback mode in LTE release 8 may be performed.

In the example of fig. 41, it is assumed that two cells (PCC and SCell) are configured in every subframes.

In the TDD 2DL:1UL configuration of FIG. 41, in the th subframe, since the PDSCH is not scheduled on the PCC and is scheduled on the SCC, the PUCCH resource is determined from the CCE index of the PDCCH used to schedule the SCC PDSCH.

In TDD 3DL:1UL configuration, PDSCH is scheduled on PCC only in all subframes. In this case, the fallback mode operation may be performed as described above. For example, ACK/NACK transmission may be performed through PUCCH format 1b using a channel selection mapping relationship as shown in table 6.

In a TDD 4DL:1UL configuration, a PUCCH resource may be determined based on a CCE index of a PDCCH used to schedule the PDSCH on the PCC because the PDSCH is scheduled on both the PCC and the SCC in a th subframe.

An example of applying CC domain bundling to mode 2 is described with reference to fig. 42.

In the example of fig. 42, it is assumed that the maximum number of ACK/NACK bits is 12 and the maximum bundling window is 2 (i.e., a maximum of two CCs is included in bundling windows).

To maintain independent ACK/NACK transmissions, bundling is applied gradually until the number of ACK/NACK bits is closest to 12 and less than 12.

In addition, the PCell (or PCC) is not included in the bundling window. That is, the bundling window is configured only for the scell (scc). The bundling windows may be applied in ascending order of CC index.

As shown in fig. 42, CC domain bundling may gradually apply a bundling window (consisting of 2 CCs) until the number of ACK/NACK bits (the number of ACK/NACK bits after applying spatial bundling) becomes 12 or less.

In the 2DL:1UL configuration of fig. 42, since the number of ACK/NACK bits after performing spatial bundling is 10, a bundling window is not configured.

In the 3DL:1UL configuration, since the number of ACK/NACK bits after performing spatial bundling is 15, a bundling window is configured. The number of ACK/NACK bits after configuring the bundling window for two CCs (SCC3 and SCC4) is 12, and thus, the bundling window is not configured any more.

In the 4DL:1UL configuration of fig. 42, a bundling window is configured because the number of ACK/NACK bits after performing spatial bundling is 20 when a bundling window for two CCs (SCC3 and SCC4) is configured, 16-bit ACK/NACK is generated and thus, another bundling windows are configured, if another bundling windows are configured for two CCs (SCC1 and SCC2), 12-bit ACK/NACK is generated and thus, the bundling window is not configured any more.

Accordingly, when using CC domain partial bundling, the bundling result (e.g., the result of a logical AND operation) for all ACK/NACK bits in a bundling window is transmitted as ACK/NACK information.

Example 11

Embodiment 11 relates to an ACK/NACK transmission method through PUCCH format 3 when a PDCCH/PDSCH is received only on a PCell (hereinafter, PCell-only reception). In particular, PCell-only reception in TDD is described in detail.

When no PDCCH corresponding to the PDSCH is received on the SCell and only the PDCCH corresponding to the PDSCH is received on the PCell, the PUCCH format 1a/1b resources of LTE release 8 may be used (i.e., may operate in a fallback mode).

In FDD, a fallback mode may be applied for the purpose of using PUCCH resources defined in LTE release 8 and the purpose of explicitly determining PUCCH resources even if ARI is not received on SCell.

However, if ACK/NACK bundling or time-domain bundling is applied, pieces of ACK/NACK information cannot be transmitted and thus, a considerable loss of DL throughput may occur, and also, since partial ACK/NACK states are overlapped in an ACK/NACK mapping relationship, ACK/NACK performance of 4-bit ACK/NACK in an LTE release 8TDD system cannot be guaranteed.

Therefore, an ACK/NACK transmission method for the PCell-only reception case is proposed below.

Example 11-1

According to this embodiment, when a single PDSCH is received on the PCell, resources of PUCCH format 1a/1b defined in LTE release 8 may be used. In this case, the use of DAI and ARI may be defined as follows.

Fig. 43 is a diagram illustrating an example of use of DAI and TPC.

As shown in fig. 43, as in the LTE rel-8 TDD system, DAI on PCell may be used as an accumulation counter for PDCCH (or PDSCH). As in LTE release 8TDD systems, the DAI on the SCell may be used as an accumulation counter for the PDCCH (or PDSCH). The DAI on the SCell may be configured to be '00'. In the illustrated example of fig. 43, the DAI values of the PDCCHs of the scells are all configured to '00'. PDCCH DCI may also be scheduled in the common search space if the DAI value of PDCCH on SCell is configured identically to '00'. In terms of UE implementation, the predefined value '00' may be used as a virtual CRC (i.e., for error detection when the DAI value is not '00').

As shown in fig. 43, the TPC field of a PDCCH first allocated on the PCell (i.e., a PDCCH with DAI ═ 00) is used for a TPC command of an original purpose. The TPC field of all other PDCCHs (including PCell and SCell) except the PDCCH with DAI ═ 00 on PCell is used for ARI purpose, and the field used for ARI purpose in PDCCH should have the same value in all PDCCHs.

The UE behavior in this case may be defined as follows.

If there is a PDSCH transmission on the PCell without a corresponding PDCCH (i.e., SPS PDSCH only),

if there are no other PDSCH transmissions,

use LTE release 8 PUCCH format 1a/1 b.

If not, the sum of the square root and the square root,

PUCCH format 3 is used.

Exceptionally, a TPC field in a PDCCH with DAI ═ 00' is used as an ARI.

Otherwise

If there is a single PDSCH with DAI ═ 00 'on the PCell or a single PDSCH with DAI ═ 00' on the PCell for indicating DLSPS release,

use LTE release 8 PUCCH format 1a/1 b.

If not, the sum of the square root and the square root,

PUCCH format 3 is used.

In the above explanation, the case where 'there is PDSCH transmission without a corresponding PDCCH' corresponds to DL SPSPDSCH. Also, a single PDSCH ' having a DAI of ' 00 ' indicates that the DAI field in the PDCCH corresponding to the PDSCH is 00.

Embodiment 11-1 is applicable to all cases including 9DL:1UL subframe configuration for TDD ACK/NACK feedback and time domain/CC domain bundling for mode 1 and mode 2.

The above-mentioned example 11-1 is summarized as follows.

The resources of LTE Release 8 PUCCH format 1a/1b and PUCCH format 1a/1b are used in the following cases: (1) a case in which 'a single PDSCH without a corresponding PDCCH' exists on the PCell, (2) a case in which 'a single PDSCH with a corresponding PDCCH' exists only on the PCell and a DAI value in the PDCCH is 00, or (3) a case in which 'a single PDCCH indicating a DL SPS release' exists only on the PCell and a DAI value in the PDCCH is 00.

LTE release 8 PUCCH format 3 is used for cases other than the above (1), (2), and (3) cases.

If 'PDSCH without corresponding PDCCH (i.e., DL SPS PDSCH)' does not exist on PCell, the following operation is performed. If 'PDSCH with corresponding PDCCH' exists on PCell and the DAI value of PDCCH is 00, the TPC field of PDCCH is used for the actual TPC command. If there is 'PDCCH indicating DL SPS release' and the DAI value of PDCCH is 00, the TPC field of PDCCH is used for the actual TPC command. In other cases, all TPC fields are used as ARI.

In other cases (i.e., there is 'PDSCH without corresponding PDCCH (i.e., DL SPSPDSCH)') on PCell, all TPC fields of PDCCH are used as ARI.

In addition, in all of the above cases, all fields used as ARI in PDCCH have the same value.

Example 11-2

In FDD, the TPC field on the SCell is used for ARI purposes and the TPC field on the PCell is used for the original TPC purposes. According to this embodiment, in TDD, in a similar manner as in FDD, the TPC field in PDCCH on PCell is used for original TPC purpose and the TPC field in PDCCH on SCell is used for ARI purpose. In this case, the same PUCCH power control operation as in the conventional LTE release 8 can be performed without modification.

Fig. 44 is a diagram illustrating another examples of the use of DAI and TPC.

As in the example of fig. 44, with respect to a UE that receives a PDSCH only on a PCell, a DAI field of a PDCCH on the PCell may be used for ARI purposes. Using such a DAI field is available in mode 1 because mode 1 does not have to support DAI in time domain/CC domain bundling. In addition, fields used as ARI of PDCCH (DAI field on PCell and TPC field on SCell) should have the same value.

In the illustrated example of fig. 44, the DAI values of the PDCCHs on the scells are all configured to '00'. The description thereof is omitted because it is the same as that of fig. 43.

The UE behavior based on the above description is defined as follows.

For scheduling or more PDSCHs or or more PDCCHs indicating SPS release on PCell

the/TPC field is used for TPC commands.

The v DAI field is used as an ARI for PUCCH format 3.

For a PDCCH scheduling PDSCH on the SCell,

the TPC field is used as an ARI for PUCCH format 3.

Exceptionally, only for SPS PDSCH without PDCCH,

use LTE release 8 PUCCH format 1a/1b (RRC configured for SPS).

All fields used as ARI in PDCCH have the same value.

The above embodiments 9 to 11 mainly relate to detailed application examples of the present invention for ACK/NACK transmission through PUCCH in a TDD system.

Example 12

In this embodiment 12, a method of using ARI in 'PDCCH indicating DL SPS release' on PCell is described.

Specifically, embodiment 12 relates to methods for transmitting ACK/NACK via PUCCH format 3 by reusing the TPC field of 'PDCCH indicating DL SPS release' when a single 'PDCCH indicating DL SPS release' on PCell is received in a case where there is no PDSCH on or more scells and there is SPS PDSCH on PCell (i.e., PDSCH without corresponding PDCCH) — that is, a method for transmitting ACK/NACK when there is no SPS PDSCH (i.e., PDSCH without corresponding PDCCH) and a single PDSCH is received on PCell has been described.

methods of using ARI in FDD are as follows.

The TPC field of the PDCCH' indicating DL SPS release on the PCell is used for ARI purposes. The TPC field of the PDCCH other than 'PDCCH indicating DL SPS release' is used on the PCell for the TPC command of the original purpose. Also, the TPC field of the PDCCH on the SCell is used as the ARI. The UE assumes that all ARI values on PCell and SCell are the same.

The UE behavior based on the above description may be defined as follows.

If there is a PDSCH on the PCell without a corresponding PDCCH (i.e., an SPS-only PDSCH),

use LTE release 8 PUCCH format 1a/1 b.

When there is no corresponding PDCCH, a PUCCH resource may be selected from RRC-configured resources through a TPC field of a PDCCH corresponding to SPS or through a value of the TPC field in the PDCCH during SPS activation (explicit mapping).

When there is a corresponding PDCCH, the PUCCH resource may be selected by a prescribed rule based on the CCE index of the PDCCH (e.g., by the equation defined in LTE rel-8) (implicit mapping).

Otherwise, if there is only a single PDCCH indicating DL SPS release on the PCell (i.e., only SPS release PDCCH).

Use PUCCH format 3.

Additionally, the TPC field of the PDCCH indicating DL SPS release may also be used as the ARI.

If not, then,

use PUCCH format 3.

Next, a method of using DAI and ARI in TDD is as follows.

As in LTE release 8, the DAI on the PCell is used as an accumulation counter for PDCCH/PDSCH. The DAI for the SCell is configured to a preset value (e.g., '00') such that DCI is scheduled on a common search space. In terms of UE implementation, this preset value may be used as a virtual CRC.

The TPC field of a PDCCH first allocated on the PCell (i.e., a PDCCH with DAI 1 or DAI 00) is used for a TPC command of an original purpose. The TPC field of all other PDCCHs except the PDCCH first allocated on the PCell (i.e., other PDCCHs on the PCell and the PDCCH on the SCell) is used for ARI purposes. The TPC field when DAI ═ 00' is also used as ARI in the other PDCCHs above. In addition, the UE assumes that all ARI values are the same.

The UE behavior based on the above description may be defined as follows.

If there is PDSCH transmission on the PCell and there is no PDCCH corresponding to the PDSCH (i.e., SPS PDSCH only),

if there is no other PDSCH transmission (i.e., if only SPSPDSCH is present),

use LTE release 8 PUCCH format 1a/1 b.

When there is no corresponding PDCCH, a PUCCH resource may be selected from RRC-configured resources through a TPC field of a PDCCH corresponding to SPS or through a value of the TPC field in the PDCCH during SPS activation (explicit mapping).

When there is a corresponding PDCCH, the PUCCH resource may be selected by a prescribed rule based on the CCE index of the PDCCH (e.g., by the equation defined in LTE rel-8) (implicit mapping).

Else if (i.e., if the SPS PDSCH includes other additional transmissions),

use PUCCH format 3-

Exceptionally, the TPC field in the PDCCH with DAI ═ 00' is also used as the ARI

Otherwise, there is no SPS

If there is a single PDSCH transmission only on PCell with only DAI ═ 00' (only the th PDCCH),

use release 8 PUCCH format 1a/1 b.

Implicit mapping can be used by rules such as the equation in release 8TDD based on CCE indices of PDCCH.

PUCCH resources (explicit mapping) may be selected from RRC configured resources during SPS activation by the TPC field of the PDCCH corresponding to SPS or by the value of the TPC field in the PDCCH.

Else, if there is a single PDCCH on PCell only indicating downlink SPS release on PCell only (SPS release only),

PUCCH format 3 is used.

As an exception, the TPC field in the PDCCH indicating downlink SPS release is also used as ARI

If not, the sum of the square root and the square root,

PUCCH format 3 is used.

Example 13

Embodiment 13 relates to methods of using different TPC fields depending on whether there is an SPS PDSCH.

As described above, the ACK/NACK response is generated with respect to three cases. Case 1 relates to a PDSCH with a corresponding PDCCH, case 2 relates to a PDCCH indicating DL SPS release, and case 3 relates to a PDSCH without a corresponding PDCCH. Case 3 is also referred to as ACK/NACK for SPS PDSCH.

In the description of this embodiment, for the 'PDCCH' indication case 1 or case 2 and the 'SPS PDSCH' indication case 3 related to the ACK/NACK response, an operation is described in which a specific UE performs DL reception for the above three cases and performs ACK/NACK for the DL reception. The ACK/NACK response transmitted in the nth UL subframe has a length in the nth-K subframe (where K ∈ K and K: { K: { K) } K₀,k₁,…k_M-1And see table 12) for the ACK/NACK responses of the DL transmissions for the above three cases. Hereinafter, description of the ACK/NACK transmission subframe position will be omitted.

If the ACK/NACK is transmitted from the UE through various formats, the complexity of blind decoding, in which the BS interprets the ACK/NACK, increases. In order to improve performance in the BS, such as complex blind decoding, and to efficiently use resources, a PUCCH format configured by a higher layer may be used. Hereinafter, a method of using different TPC fields depending on whether there is an SPS PDSCH will be described in detail.

Meanwhile, if there is no SPS PDSCH, the TPC field of a PDCCH having DL DAI ═ 1 may be used for the original TPC command, and the TPC field of a PDCCH having DL DAI >1 may be used as ARI.

In addition, when serving cells are configured, the use of PUCCH format may be determined as follows if the UE 'only' receives SPS PDSCH, LTE release 8 PUCCH format 1a/1b may be used or, if the UE 'only' receives a single PDCCH with dl dai ═ 1, LTE release 8 PUCCH format 1a/1b may be used.

If DL DAI is used as a simple counter (PDCCH accumulation counter), the resource allocation of TDD PUCCH format 3 in CA may be the same as in a single carrier (or non-CA). That is, the resource allocation method for the PCell may use the same method as the resource allocation method in the non-CA. In case of CA, PUCCH resource allocation for a plurality of cells may be determined as follows.

At the same time, if there is no SPS PDSCH, only the TPC field of the PDCCH on the PCell with DL DAI ═ 1 may be used for the original TPC command and the TPC fields of all other PDCCHs on the PCell and or more scells may be used for ARI purposes.

LTE release 8 PUCCH format 1a/1b may be used if the UE 'only' receives SPS PDSCH or LTE release 8 PUCCH format 1a/1b may be used if the UE 'only' receives a single PDCCH with dl dai ═ 1.

Example 14

Embodiment 14 relates to a PUCCH resource allocation method for TDD HARG ACK/NACK response transmission in consideration of the above-described embodiments.

In the conventional LTE release 8/9 system, a loss of independent ACK/NACK information has occurred because ACK/NACK bundling (spatial bundling and/or time-domain bundling) is applied to ACK/NACK transmissions that exceed a prescribed bit size (e.g., 4 bits). In LTE release 10 (or LTE-a) systems, PUCCH format 3 is designed to support transmission of up to 20 bits of independent ACK/NACK information. In a CA and/or TDD support system, since a case in which 20 bits or more of ACK/NACK is transmitted may occur, a method for efficiently utilizing resources while transmitting ACK/NACK information without loss is required.

Although the TPC field of a PDCCH with dl dai ═ 1 on PCell is used for the original TPC command, the TPC fields of other PDCCHs on PCell and SCell are used as ARI.

When the TPC field is reused as the ARI, the accuracy of PUCCH power control may be reduced. However, since the resources of the PUCCH format 3 can be surely determined by the ARI information, transmission of ACK/NACK information without loss using the PUCCH format 3 may be preferable for the entire system with respect to a reduction in the accuracy of PUCCH power control.

In the example of fig. 45, when the UE succeeds in detecting at least PDCCHs including an ARI, the ACK/NACK response may be transmitted using PUCCH format 3 indicated by the ARI, however, if the UE' detects only a PDCCH without an ARI (i.e., a PDCCH with DAI ═ 1 on the PCell), the UE cannot obtain ARI information and cannot determine PUCCH format 3 resources.

Accordingly, resource allocation methods can be provided, which can transmit ACK/NACK responses for DL transmissions (PDCCH and/or PDSCH) transmitted in or more DL subframes without any loss, and in addition, since a PUCCH format and PUCCH resources are determined in the same manner regardless of CA or non-CA, the operations of a BS and a UE can be simply and clearly specified.

Fig. 46 is an overall flowchart illustrating various embodiments proposed in the present invention. In the example of fig. 46, a description is given on the premise that PUCCH format 3 is configured for a UE by a higher layer.

In step S4610, the UE determines whether a PDSCH with DAI-1 (i.e., a PDSCH corresponding to a PDCCH with DAI-1) is received on the PCell only.

If the result of step S4610 is YES, step S4620 is executed. Since the TPC field of the PDCCH with DAI-1 on the PCell is used for the original TPC command, the UE cannot acquire ARI information when only the PDCCH with DAI-1 is received. Therefore, the UE does not use PUCCH format 3. The UE may transmit the ACK/NACK using PUCCH format 1a/1 b. The resources of the PUCCH formats 1a/1b may be determined through implicit mapping (i.e., through PUCCH resource indexes derived from CCE indexes of the PDCCH).

Meanwhile, if the result of step S4610 is no, step S4630 is performed. In step S4630, the UE determines whether a single PDSCH without PDCCH on the PCell only has been received.

If the result of step S4630 is YES, step S4640 is executed. Since the UE has not received the PDCCH, the UE cannot acquire ARI information and does not use PUCCH format 3. The UE may transmit the ACK/NACK using PUCCH format 1a/1 b. Here, since the PDCCH has not been received, the UE cannot derive a PUCCH resource index derived from a PDCCH CCE index. Accordingly, the UE may determine the PUCCH resource index from information included in the SPS activation PDCCH (e.g., information indicated by reuse of the TPC field in the SPS activation PDCCH).

If the result of step S4630 is NO, step S4650 is performed. In step S4650, the UE determines whether 'PDSCH with DAI-1' and another 'PDSCH without PDCCH' on the PCell only have been received.

If the result of step S4650 is YES, step S4660 is executed. Even in this case, the UE uses PUCCH format 1a/1b instead of PUCCH format 3 because ARI information cannot be obtained. Here, the UE may transmit ACK/NACK information through a channel selection scheme in order to prevent loss of the ACK/NACK information. Channel selection may be performed such that PUCCH resources are selected from a (═ 2 or 3) PUCCH resources. Here, the value of a may be determined according to the number of codewords (or transport blocks) of the PDSCH.

Meanwhile, if the result of step S4650 is no, step S4670 is performed in step S4670, the UE may determine whether the value of ARI (i.e., TPC field) of PDCCH in which the DAI value is not 1 (i.e., DAI >1) is equal to the ARI (i.e., TPC field) values of all PDCCHs on or more scells.

If the result of step S4670 is yes, step S4680 is performed in which case the UE may transmit ACK/NACK information using PUCCH format 3 resources indicated by ARI the UE assumes that the ARI value is the same in all PDCCHs and may perform step S4680 using the ARI values in at least PDCCHs.

Meanwhile, if the result of step S4670 is no (i.e., if ARI values on PCell and scells are not equal), the UE may discard the received PDCCH.

In summary, for 'PDSCH with PDCCH', 'PDSCH without PDCCH (SPS-PDSCH)' and 'SPS release PDCCH' for which the UE should transmit ACK/NACK, the following UE behavior may be defined. However, the scope of the present invention is not so limited and TDD HARQ ACK/NACK resource allocation and transmission operations may be performed by available combinations of the various embodiments of the present invention.

First, the operation of the non-CA system may be the same as 'PCell-only reception' operation in a CA environment, that is, TDD HARQ ACK/NACK resource allocation and transmission operation when serving cells are configured for a UE may be the same as TDD HARQ ACK/NACK resource allocation and transmission operation when PDSCH and/or PDCCH are received only on a PCell in case that more than serving cells are configured, and thus, hereinafter, when serving cells only are configured, description of operation on the PCell may be replaced with operation on the serving cell.

If the DAI in the PDCCH of the PCell corresponding to the PDSCH is 1, the TPC field is used for the original power control purpose. If the DAI in the PDCCH corresponding to the PDSCH is greater than 1, the TPC field is used as the ARI. The TPC field in the PDCCH corresponding to all PDSCHs on the SCell is used as the ARI. The UE assumes that all ARI values are the same.

If the UE receives only SPS-PDSCHs on the PCell only, the UE falls back to PUCCH format 1a/1 b.

If the UE receives only a PDSCH with DAI-1 (i.e., a PDSCH with DAI-1 corresponding to a PDCCH), the UE falls back to PUCCH format 1a/1 b.

If PDSCHs with DAI ═ 1 and SPS-PDSCHs are received on the PCell only, ACK/NACK transmission is performed by using the channel selection scheme of PUCCH format 1 b.

If or more PDSCHs having DAI >1 (PDCCH having DAI >1 corresponding to PDSCH) are received, ACK/NACK transmission is performed using PUCCH format 3 resources indicated by ARI.

If or more PDSCHs are received on the SCell, ACK/NACK transmission is performed using PUCCH format 3 resources indicated by the ARI.

Accordingly, for all cases of of 'PDSCH with PDCCH', 'PDSCH without PDCCH (SPS-PDSCH)' and 'SPS release PDCCH' received only on PCell or on PCell and or more scells, ACK/NACK information can be correctly and efficiently transmitted without loss of ACK/NACK information.

Although the present invention has been described with reference to preferred embodiments, those skilled in the art will appreciate that various modifications and changes may be made in the present invention without departing from the spirit and scope of the invention as described in the appended claims.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms than those set forth herein without departing from the spirit or essential characteristics of the invention. The above description is therefore to be construed in all aspects as illustrative and not restrictive. The scope of the invention should be determined by reasonable interpretation of the appended claims and all changes which come within the equivalent scope of the invention are intended to fall within the scope of the invention. In addition, claims that are not explicitly dependent on each other may be combined to provide an embodiment, or new claims may be added by modification after filing the present application.

[ INDUSTRIAL APPLICABILITY ]

The invention is suitable for various mobile communication systems.

Claims (8)

1, a method for transmitting acknowledgement/negative acknowledgement, ACK/NACK, information at a user equipment, UE, configured with a physical uplink control channel, PUCCH, format 3 in a wireless communication system, comprising:

determining a PUCCH format and PUCCH resources by which the ACK/NACK information for downlink transmission in a downlink frame set including at least downlink subframes is to be transmitted, and,

transmitting the ACK/NACK information using PUCCH format 1a/1b and the PUCCH resources,

wherein serving cells are configured for the UE, and

wherein the ACK/NACK information is transmitted by using the PUCCH format 1a/1b when the ACK/NACK information corresponds to only Physical Downlink Shared Channels (PDSCHs) indicated by detection of a corresponding Physical Downlink Control Channel (PDCCH) having a Downlink Assignment Index (DAI) with a value of 1 or corresponds to only a semi-persistent scheduling (SPS) release PDCCH having a DAI value of 1.

2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

wherein the PUCCH resource is derived from a Control Channel Element (CCE) index of the corresponding PDCCH or the SPS Release PDCCH.

3. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

wherein the ACK/NACK information is transmitted by using the PUCCH format 1a/1b when the ACK/NACK information corresponds to only PDSCHs having no corresponding PDCCH.

4. The method of claim 3, wherein the first and second light sources are selected from the group consisting of,

wherein the PUCCH resources are determined by a value of a Transmit Power Control (TPC) field of a PDCCH indicating SPS activation, when the ACK/NACK information corresponds to only PDSCHs having no corresponding PDCCH.

5. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

wherein the wireless communication system is a time division duplex, TDD, wireless communication system.

6. A user equipment, UE, for transmitting acknowledgement/negative acknowledgement, ACK/NACK, information in a wireless communication system and configured with physical uplink control channel, PUCCH, format 3, comprising:

a receiving module;

a transmitting module; and the number of the first and second groups,

a processor for processing the received data, wherein the processor is used for processing the received data,

wherein the processor determines a PUCCH format and a PUCCH resource through which the ACK/NACK information is transmitted, and transmits the ACK/NACK information for downlink transmission in a downlink frame set including at least downlink subframes using PUCCH format 1a/1b and the PUCCH resource through the transmission module,

wherein serving cells are configured for the UE, and

wherein the ACK/NACK information is transmitted by using the PUCCH format 1a/1b when the ACK/NACK information corresponds to only Physical Downlink Shared Channels (PDSCHs) indicated by detection of a corresponding Physical Downlink Control Channel (PDCCH) having a Downlink Assignment Index (DAI) with a value of 1 or corresponds to only a semi-persistent scheduling (SPS) release PDCCH having a DAI value of 1.

7, A method for receiving acknowledgement/negative acknowledgement (ACK/NACK) information by a Base Station (BS) from a User Equipment (UE) configured with a Physical Uplink Control Channel (PUCCH) format 3 in a wireless communication system, comprising:

transmitting a downlink transmission to the UE; and

receiving the ACK/NACK information for the downlink transmission in a downlink frame set including at least downlink subframes using PUCCH format 1a/1b and PUCCH resources,

wherein serving cells are configured for the UE, and

wherein the ACK/NACK information is received by using the PUCCH format 1a/1b when the ACK/NACK information corresponds to only Physical Downlink Shared Channels (PDSCHs) indicated by detection of a corresponding Physical Downlink Control Channel (PDCCH) having a Downlink Assignment Index (DAI) with a value of 1 or corresponds to only a semi-persistent scheduling (SPS) release PDCCH having a DAI value of 1.

8, a base station BS for receiving acknowledgement/negative acknowledgement, ACK/NACK, information from a user equipment, UE, configured with a physical uplink control channel, PUCCH, format 3 in a wireless communication system, comprising:

a receiving module;

a transmitting module; and the number of the first and second groups,

a processor for processing the received data, wherein the processor is used for processing the received data,

wherein the processor transmits a downlink transmission to the UE through the transmission module and receives the ACK/NACK information for the downlink transmission in a downlink frame set including at least downlink subframes through the reception module using PUCCH format 1a/1b and PUCCH resources,

wherein serving cells are configured for the UE, and

wherein the ACK/NACK information is received by using the PUCCH format 1a/1b when the ACK/NACK information corresponds to only Physical Downlink Shared Channels (PDSCHs) indicated by detection of a corresponding Physical Downlink Control Channel (PDCCH) having a Downlink Assignment Index (DAI) with a value of 1 or corresponds to only a semi-persistent scheduling (SPS) release PDCCH having a DAI value of 1.

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