KR20120085045A

KR20120085045A - Method and apparatus for processing harq ack/nack signal

Info

Publication number: KR20120085045A
Application number: KR1020110006435A
Authority: KR
Inventors: 박동현; 윤창규; 홍성권
Original assignee: 주식회사 팬택
Priority date: 2011-01-21
Filing date: 2011-01-21
Publication date: 2012-07-31

Abstract

The present invention relates to a method and apparatus for processing a HARQ ACK / NACK signal. The method for processing a HARQ ACK / NACK signal according to the present invention includes bundling a predetermined HARQ ACK / NACK signal among HARQ ACK / NACK signals, and bundling them. Aligning the transmission target HARQ ACK / NACK signals including the HARQ ACK / NACK signal, segmenting the aligned transmission target HARQ ACK / NACK signals, and ordering the segmented transmission target HARQ ACK / NACK signals; According to the channel coding, the channel coding is performed through a dual coder, the segmented transmission target HARQ ACK / NACK signal is input to each of the dual coder divided, in the alignment step, the bundled HARQ ACK / NACK signal Is arranged to be evenly distributed to each of the dual coders, HARQ ACK / NACK signal processing method according to the present invention transmits the HARQ ACK / NACK signal in PUCCH format 3 in a TDD (Time Division Duplex) environment It may be performed in the terminal.

Description

Method and apparatus for processing HACR AC / NAC signal {Method And Apparatus For Processing HARQ ACK / NACK Signal}

The present invention relates to a wireless communication technology, and more particularly, to a method and apparatus for transmitting a hybrid ARQ (HARQ) response signal.

Wireless communication systems generally use one bandwidth for data transmission. For example, second generation wireless communication systems use a bandwidth of 200 KHz-1.25 MHz, and third generation wireless communication systems use a bandwidth of 5 MHz-10 MHz. In order to support increasing transmission capacity, the recent Long Term Evolution (LTE) or IEEE 802.16m of the 3rd Generation Partnership Project (3GPP) continues to expand its bandwidth to 20 MHz or more. Increasing bandwidth is essential to increase transmission capacity, but frequency allocation of large bandwidths is not easy except in some regions of the world.

Carrier Aggregation is a technique for efficiently using fragmented small bands, which combines multiple bands that are physically non-continuous in the frequency domain to produce the same effect as using logically large bands. : CA) technology is being developed. Individual unit carriers bound by carrier aggregation are called component carriers (CC). Each component carrier is defined by one bandwidth and a center frequency.

A system capable of transmitting and / or receiving data over a wide band through a plurality of component carriers is called a multiple component carrier system or a carrier aggregation environment. Multi-component carrier systems use narrowband and wideband simultaneously by using one or more carriers. For example, if one carrier corresponds to a bandwidth of 5 MHz, it is possible to support a bandwidth of up to 20 MHz by using four carriers.

In order to operate a multi-component carrier system, various control signaling is required between a base station and a terminal. For example, an exchange of ACK (ACKnowledgement) / NACK (Not-ACKnowledgement) information for performing a hybrid automatic repeat request (HARQ), a channel quality indicator (CQI) indicating downlink channel quality, and the like are required.

An object of the present invention is to provide a method in which bundling is performed and channel coding can be effectively performed in the case of transmitting a HARQ ACK / ANCK signal of 20 bits or more using PUCCH format 3.

The present invention provides a method for processing an HARQ ACK / NACK signal, comprising: bundling a predetermined HARQ ACK / NACK signal among HARQ ACK / NACK signals, and aligning transmission target HARQ ACK / NACK signals including a bundled HARQ ACK / NACK signal Segmenting the sorted transmission target HARQ ACK / NACK signals and channel coding the segmented transmission target HARQ ACK / NACK signals according to the sorted order, wherein the channel coding is performed through a dual coder. The segmented transmission target HARQ ACK / NACK signal is input to the dual coders separately, and in the alignment step, the bundled HARQ ACK / NACK signals are arranged to be evenly distributed to each of the dual coders.

At this time, the HARQ ACK / NACK signal processing method according to the present invention may be performed in a terminal transmitting a HARQ ACK / NACK signal in PUCCH format 3 in a TDD (Time Division Duplex) environment.

In addition, the present invention is a terminal device, a bundling unit for bundling HARQ ACK / NACK signal, an alignment unit for aligning the transmission target HARQ ACK / NACK signal including the bundled HARQ ACK / NACK signal, aligned HARQ ACK / A segmentation unit for segmenting the NACK signal, and a coding unit for channel coding the segmented transmission target HARQ ACK / NACK signals according to the sorted order, the coding unit is composed of a dual coder, the segmentation unit segmented transmission HARQ ACK The / NACK signal is divided and input to the dual coder, and the alignment unit aligns the HARQ ACK / NACK signal to be transmitted so that the bundled HARQ ACK / NACK signal is evenly distributed to the dual coder.

The HARQ ACK / NACK signal may be transmitted in PUCCH format 3 in a time division duplex (TDD) environment by using the terminal device according to the present invention.

According to the present invention, in case of transmitting a HARQ ACK / ANCK signal of 20 bits or more using PUCCH format 3, bundling may be performed and effective channel coding may be performed in consideration of this.

1 shows an example of a frame structure for multi-carrier operation.
2 illustrates linkage between a downlink component carrier and an uplink component carrier in a multi-carrier system.
3 shows downlink HARQ transmission.
4 shows an example of an uplink subframe structure carrying an ACK / NACK signal.
5 shows an example of transmitting an ACK / NACK signal on a PUCCH.
6 shows an example of mapping a PUCCH to physical RBs according to Equation 4 above.
7 schematically illustrates an example of PUCCH format 3 in the case of a normal CP.
8 schematically illustrates a time and frequency structure of an uplink / downlink in FDD and TDD modes.
9 is a configuration diagram schematically illustrating an embodiment of a configuration of a terminal (UE) to which the present invention is applied.
10 is a diagram schematically illustrating another embodiment of a configuration of a terminal to which the present invention is applied.
11 is a flowchart schematically illustrating an operation between a base station and a terminal in a system to which the present invention is applied.
12 is a flowchart schematically illustrating RM coding through bundling / aligning / segmentation in order to transmit a HARQ ACK / NACK signal in PUCCH format 3 in a terminal of a system to which the present invention is applied.
13 to 17 schematically illustrate bundling and alignment of HARQ ACK / NACK signals performed in a system to which the present invention is applied.
18 is a block diagram schematically illustrating an example of a configuration of a base station and a terminal in a system to which the present invention is applied.

Hereinafter, some embodiments will be described in detail with reference to the accompanying drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In addition, in describing the embodiments of the present specification, when it is determined that the detailed description of the related well-known configuration or function may obscure the subject matter of the present specification, the detailed description thereof will be omitted.

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

The wireless communication system to which the present invention is applied may be a network structure of 3GPP LTE / LTE-A. The Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) includes a base station that provides a control plane and a user plane to the terminal.

The terminal may be fixed or mobile, and may include a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), and a wireless modem. It may be called other terms such as a wireless modem and a handheld device. A base station generally refers to a fixed station communicating with a terminal, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.

There is no limitation on the multiple access scheme applied to the wireless communication system. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

Carrier aggregation (CA) supports a plurality of carriers, also referred to as spectrum aggregation or bandwidth aggregation. Carrier aggregation is introduced to support increased throughput, to prevent cost increase due to the introduction of wideband radio frequency (RF) devices, and to ensure compatibility with existing systems. For example, if five component carriers are allocated as granularity in a carrier unit having a 5 MHz bandwidth, a bandwidth of up to 25 MHz may be supported.

Carrier aggregation may be divided into contiguous carrier aggregation between continuous component carriers in the frequency domain and non-contiguous carrier aggregation between discontinuous component carriers. The number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink component carriers and the number of uplink component carriers are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.

The size (ie, bandwidth) of component carriers may be different. For example, assuming that 5 component carriers are used for the configuration of the 70 MHz band, a 5 MHz component carrier (carrier # 0) + 20 MHz component carrier (carrier # 1) + 20 MHz component carrier (carrier # 2) It may be configured as a +20 MHz component carrier (carrier # 3) + 5 MHz component carrier (carrier # 4).

Hereinafter, a multiple carrier system refers to a system supporting carrier aggregation. Adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used in a multi-carrier system, and either symmetric aggregation or asymmetric aggregation may be used.

1 shows an example of a frame structure for multi-carrier operation.

Referring to FIG. 1, a frame consists of 10 subframes. The subframe includes a plurality of OFDM symbols. Each carrier may have its own control channel (eg, PDCCH). The multicarriers may or may not be adjacent to each other. The terminal may support one or more carriers according to its capability.

The component carrier may be divided into a fully configured carrier and a partially configured carrier according to directionality. A preset carrier refers to a carrier capable of transmitting and / or receiving all control signals and data on a bidirectional carrier, and a partially configured carrier refers to a carrier capable of transmitting only downlink data on a unidirectional carrier. . Partially configured carrier may be mainly used in the Multicast and Broadcast Service (MBS) and / or Single Frequency Network (SFN).

The CC may be divided into a Primary Component Carrier (PCC) and a Secondary Component Carrier (SCC) according to activation. The major carriers are always active carriers, and the subcarrier carriers are carriers that are activated / deactivated according to specific conditions. Activation refers to the transmission or reception of traffic data being made or in a ready state. Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible. The terminal may use only one major carrier, or may use one or more subcomponent carriers together with the major carrier. The terminal may be assigned a major carrier and / or sub-carrier carrier from the base station. The major carrier may be a preset carrier file, and is a carrier through which main control information is exchanged between the base station and the terminal. The subcarrier may be a preset carrier or a partial carrier, and is a carrier allocated according to a request of a terminal or an indication of a base station. The major carriers may be used for network entry and / or subcarrier allocation of the terminal. The major carriers may be selected from among preset carriers rather than being fixed to a specific carrier. A carrier set as a subcarrier may also be changed to a major carrier.

2 illustrates linkage between a downlink component carrier and an uplink component carrier in a multi-carrier system.

Referring to FIG. 2, in downlink, downlink component carriers D1, D2, and D3 are aggregated, and uplink component carriers U1, U2, and U3 are aggregated in uplink. Di is an index of a downlink component carrier, and Ui is an index of an uplink component carrier (i = 1, 2, 3). One of the downlink component carriers among the aggregated downlink component carriers is a major carrier wave, and the rest are subcomponent carriers. Similarly, one uplink component carrier among the aggregated uplink component carriers is a major carrier wave, and the rest are subcomponent carriers. For example, D1 and U1 are major carrier waves, and D2, U2, D3 and U3 are subcomponent carriers.

In this manner, in the carrier aggregation, the PDCCH may transmit allocation information for resources of other carriers as well as resource allocation in the carrier to which the PDCCH belongs. This is called cross-carrier scheduling. In the intercarrier scheduling, scheduling information is flexible because control information on subcarriers can be transmitted through a subcarrier.

3 shows downlink HARQ transmission.

Referring to FIG. 3, a terminal receiving downlink data from a base station transmits ACK (ACKnowledgement) / NACK (Not-ACKnowledgement) information after a predetermined time elapses. The downlink data may be transmitted on the PDSCH indicated by the PDCCH. The ACK / NACK signal becomes ACK information when the downlink data is successfully decoded, and becomes NACK information when the decoding of the downlink data fails. When the NACK information is received, the base station may retransmit the downlink data up to a maximum number of retransmissions.

4 shows an example of an uplink subframe structure carrying an ACK / NACK signal.

Referring to FIG. 4, an uplink subframe may be divided into a control region in which a PUCCH carrying uplink control information is allocated and a data region in which a PUSCH carrying user data is allocated in the frequency domain.

PUCCH for one UE is allocated as a resource block pair (RB pair) in a subframe, and the allocated resource block pairs are resource blocks corresponding to different subcarriers in each of two slots. The resource block pair allocated to the PUCCH is said to be frequency hopping at a slot boundary.

PUCCH may support multiple formats. That is, uplink control information having different numbers of bits per subframe may be transmitted according to a modulation scheme. Table 1 below shows modulation schemes and number of bits according to various PUCCH formats.

PUCCH format 1 is used to transmit a scheduling request (SR), and PUCCH format 1a / 1b is used to transmit a HARQ ACK / NACK signal. PUCCH format 2 is used for transmission of CQI, and PUCCH format 2a / 2b is used for transmission of CQI and HARQ ACK / NACK. When the HARQ ACK / NACK signal is transmitted alone, PUCCH format 1a / 1b is used, and when the SR is transmitted alone, PUCCH format 1 is used.

Control information transmitted on the PUCCH uses a cyclically shifted sequence. A cyclically shifted sequence is a cyclic shift of a base sequence by a specific cyclic shift amount.

When one resource block includes 12 subcarriers, a sequence of length 12 as shown in Equation 1 below is used as a base sequence.

Where i ∈ {0,1, ..., 29} is the root index, n is the element index, and 0≤n≤N-1, and N is the length of the sequence. Different base sequences define different base sequences. When N = 12, b (n) is defined as in the following table.

Accordingly, the basic sequence r (n) may be cyclically shifted as in Equation 2.

Here, 'a' represents a cyclic shift (CS) amount, and 'mod' represents a modulo operation.

5 shows an example of transmitting an ACK / NACK signal on a PUCCH.

Referring to FIG. 5, RS (Reference Signal) is carried on 3 SC-FDMA symbols among 7 SC-FDMA symbols included in one slot, and ACK / NACK signals are carried on the remaining 4 SC-FDMA symbols. The RS is carried in three contiguous SC-FDMA symbols in the middle of the slot.

In order to transmit the ACK / NACK signal, a 2-bit ACK / NACK signal is modulated by Quadrature Phase Shift Keying (QPSK) to generate one modulation symbol d (0). A modulated sequence y (n) is generated based on the modulation symbol d (0) and the cyclically shifted sequence r (n, a). The following modulated sequence y (n) may be generated by multiplying a cyclically shifted sequence r (n, a) by a modulation symbol.

The CS amount of the cyclically shifted sequence r (n, a) may be different for each SC-FDMA symbol and may be the same. Here, the CS amounts a are sequentially set to 0, 1, 2, and 3 for 4 SC-FDMA symbols in one slot, but this is merely an example.

Here, an example of generating one modulation symbol by performing QPSK modulation on a 2-bit ACK / NACK signal may be performed. However, one modulation symbol may be generated by performing a binary phase shift keying (BPSK) modulation on a 1-bit ACK / NACK signal. have. The number of bits, modulation scheme, and number of modulation symbols of the ACK / NACK signal are only examples, and do not limit the technical spirit of the present invention.

In addition, to increase the terminal capacity, the modulated sequence may be spread again using an orthogonal sequence (OS). An orthogonal sequence w _i (k) (i is a sequence index, 0 ≦ k ≦ K−1) having a spreading factor K = 4 may use the following sequence.

Alternatively, the following sequence may be used as an orthogonal sequence w _i (k) (i is a sequence index, 0 ≦ k ≦ K−1) having a spreading coefficient K = 3.

Here, it is shown to spread the modulated sequence through an orthogonal sequence w _i (k) with spreading factor K = 4 for 4 SC-FDMA symbols in one slot for the ACK / NACK signal.

The RS may be generated based on a cyclically shifted sequence and an orthogonal sequence generated from the same basic sequence as ACK / NACK. That is, the cyclically shifted sequence can be spread through an orthogonal sequence w _i (k) having a spreading coefficient K = 3 and used as RS.

Resource Index n ⁽¹⁾ which is a resource for transmission of PUCCH format 1 / 1a / 1b ⁽¹⁾ _PUCCH is not only the position of the physical resource block to which the A / N signal is transmitted, but also the CS amount α (n _s ,) of the basic sequence. l) and orthogonal sequence index n _OC (n _s ). Resource index n ⁽¹⁾ _PUCCH for HARQ ACK / NACK signal is obtained as shown in Table 5 below. The resource index n ⁽¹⁾ _PUCCH is a parameter for determining the physical RB index n _PRB , the CS amount α (n _s , l) of the base sequence, and the orthogonal sequence index n _OC (n _s ).

Dynamic scheduling Semi-persistent scheduling Resource index n ⁽¹⁾ _PUCCH = n _CCE + N ⁽¹⁾ _PUCCH Signaled by higher layer or a control channel Higher Layer Signaling value N ⁽¹⁾ _PUCCH n ⁽¹⁾ _PUCCH

That is, according to Table 5, the HARQ ACK / NACK signal for the PDSCH transmitted in the nth subframe is the first CCE (Control Channel Element) index n _CCE of the PDCCH transmitted in the nth subframe and the higher layer signaling. is transmitted in the n + 4th subframe using resource index n ⁽¹⁾ _PUCCH , which is the sum of the value N ⁽¹⁾ _PUCCH obtained through signaling) or a separate control channel. N ⁽¹⁾ _PUCCH is the total number of PUCCH format 1 / 1a / 1b resources required for Semi-Persistent Scheduling (SPS) transmission and Service Request (SR) transmission. In the semi-static scheduling transmission and the SR transmission, since the PDCCH indicating the PDSCH transmission does not exist, the base station explicitly informs the UE of n ⁽¹⁾ _PUCCH .

When the HARQ ACK / NACK signal and / or the SR are transmitted through the PUCCH format 1 / 1a / 1b, the physical RB index n _PRB is determined by the resource index n ⁽¹⁾ _PUCCH . This is shown in Equation 4 below.

6 shows an example of mapping a PUCCH to physical RBs according to Equation 4 above. According to the resource index n ⁽¹⁾ _PUCCH and determines a physical RB n _PRB index, PUCCH corresponding to the respective m is frequency hopping (hopping) to the slots.

In a carrier aggregation (CA) environment, HARQ ACK / NACK signals for a plurality of downlink component carriers may be transmitted through one uplink component carrier. At this time, one bit of an ACK / NACK signal is transmitted per codeword (CW, hereinafter referred to as 'CW').

The HARQ ACK / NACK signal for the downlink is transmitted on the PUCCH. The PUCCH format for transmitting the HARQ ACK / NACK signal for the downlink has formats 1a / 1b. In addition, PUCCH format 3 is discussed in addition to the PUCCH format described in Table 1.

Among these, the PUCCH format 1b may transmit 2 to 4 bits of an ACK / NACK signal by using channel selection. The channel selection allocates HARQ ACK / NACK resources for downlink by using a table that maps a message to be transmitted, a resource to be used for transmission of the message, and a modulation symbol. The channel selection table may be configured by a combination of a plurality of resource indexes and modulation symbols of the ACK / NACK signal, and may be configured in consideration of the number of bits M used to transmit the ACK / NACK signal. Since the resources required for signal transmission of up to 4 bits can be allocated through the channel selection, for an ACK / NACK signal of 4 bits or less, a table is constructed according to the value of the number of bits (M) required to transmit the ACK / NACK signal. Using this, ACK / NACK resources can be allocated.

In addition, when the PUCCH format 3 is used, HARQ ACK / NACK signals of up to 10 bits in FDD and 20 bits in TDD may be multiplexed and transmitted. PUCCH format 3 is a PUCCH format to which Discrete Fourier Transform-Spreading-Orthogonal Frequency-Division Multiplexing (DFT-S-OFDM) is applied, and uses DFT-IFFT and block-spreading. In case of transmitting HARQ ACK / NACK signal using PUCCH format 3, as one ACK / NACK resource, up to 10 bits of information in FDD and up to 20 bits of information in TDD are used as HARQ ACK / NACK signals. Can transmit

7 schematically illustrates an example of PUCCH format 3 in the case of a normal CP. In case of PUCCH format 3 in a normal CP, one slot includes 7 OFDM symbols, 2 OFDM symbols become RS OFDM symbols for a reference signal, 5 OFDM symbols represent an uplink control signal, For example, it becomes a data OFDM symbol for an ACK / NACK signal. Here, the number of RS OFDM symbols and data OFDM symbols is merely an example.

First, channel encoding is performed on information bits such as ACK / NACK to be transmitted on a carrier. Various methods of channel encoding can be applied. For example, simple repetition, simplex coding, Reed-Muller coding, punctured RM coding, tail-biting convolutional coding (TBCC), low density parity check (LDPC) coding Alternatively, any one of various types of coding schemes such as turbo coding may be used. The encoding information bits generated as a result of the channel coding may be rate-matched in consideration of a resource mapped to a modulation symbol order to be applied.

The encoding information bits generated as a result of the channel coding are cell-specific scrambling or RNTI (Radio) using a scrambling code corresponding to a cell ID in consideration of inter-cell interference (ICI). Terminal specific scrambling using a scrambling code corresponding to a terminal ID such as a network temporary identifier (ID) may be applied.

The encoding information bits are then modulated via a modulator. The encoding information bits may be modulated to generate a QPSK symbol. The modulated symbol is distributed to the first and second slots by a divider. The modulated symbols can be distributed in various ways. The order of modulators and dividers may be reversed.

The modulated symbol is time spread through an orthogonal code of index m determined through RRC (Radio Resource Control) signaling or the like. An orthogonal code having an index m may be expressed as wm = [w0, w1, w2, w3, w4] when the spreading factor (SF) is 5 as shown in FIG. Walsh code, DFT code or other orthogonal code may be used as the orthogonal code. In this case, the spreading factor means a factor in which data is spread, and may vary depending on the system. The spreading factor may be related to the number of terminals or antennas multiplexed or may be applied by changing an index at a slot level.

Spreaded modulation symbols are precoded by Discrete Fourier Transform (DFT), then subcarriers in a Physical Resource Block (PRB), transformed into time-domain signals by Inverse Fast Fourier Transform (IFFT), and transmitted with CP . Although an embodiment of the PUCCH format 3 has been described herein, the PUCCH format 3 may be variously implemented, and the present invention is not limited to the implementation of the specific PUCCH format 3.

For transmission of the ACK / NACK signal, the base station may implicitly assign the ACK / NACK resource index. Implicitly allocating an ACK / NACK resource index means that the base station allocates a resource index calculated by using n _CCE , which means a number of _CCEs , as a parameter among at least one CCE constituting the PDCCH of CC # a. The base station may also assign the resource index explicitly. The base station explicitly allocating the resource index to the terminal does not depend on n _CCE , but allocates the resource index of the PUCCH dedicated to the specific terminal through separate signaling such as a resource allocation indicator from the base station to the terminal. Means.

The terminal may transmit the ACK / NACK signal by using the allocated ACK / NACK resource (index). For example, when the UE transmits the HARQ ACK / NACK signal in the PUCCH format 1b using the channel selection, the channel selection table may be configured using the allocated resources. When the terminal transmits the HARQ ACK / NACK signal in PUCCH format 3, it can transmit the HARQ ACK / NACK signal to the allocated resources.

On the other hand, Figure 8 schematically shows the time and frequency structure of the uplink / downlink in the FDD and TDD mode. In case of LTE, as shown in FIG. 8, both FDD and TDD are supported. In the case of FDD, there are carrier frequencies used for uplink transmission and carrier frequencies used for downlink transmission, respectively, so that uplink transmission and downlink transmission can be simultaneously performed in a cell.

In the case of TDD, uplink transmission and downlink transmission are always distinguished in time based on one cell. Since the same carrier is used for uplink transmission and downlink transmission, the base station and the terminal repeat the switching between the transmission mode and the reception mode. In the case of TDD, a special subframe may be provided to provide a guard time for mode switching between transmission and reception. As illustrated, the special subframe may include a downlink part DwPTS, a guard period GP, and an uplink part UpPTS. Neither uplink transmission nor downlink transmission is performed during the protection period.

Table 6 shows configuration of uplink and downlink in TDD mode.

As shown in Table 6, the base station and the terminal performs uplink and downlink transmission through seven possible downlink / uplink frame settings. In a frame structure consisting of 10 subframes, 'D' represents a downlink subframe and 'U' represents an uplink subframe. 'S' represents the special subframe described above.

Through downlink / uplink configuration, transmission resources can be allocated asymmetrically for uplink transmission and downlink transmission. In addition, the downlink / uplink frame configuration used between the base station and the terminal is not dynamically changed. For example, a base station and a terminal that perform downlink and uplink transmissions in configuration 3 do not perform downlink and uplink transmissions using configuration 4 in units of frames. However, the configuration may be changed to RRC according to the change of network environment or system.

Meanwhile, in the case of FDD, the UE transmits HARQ ACK / NACK for the PDSCH (s) received in subframe n-4 in subframe n.

In the case of TDD, the UE transmits HARQ ACK / NACK for the PDSCH (s) received in the subframe (s) nk in the uplink subframe n. In this case, k is an element of K, K may be defined by Table 7. K is determined by UL-DL configuration and subframe n, where {k ₀ , k ₁ ,. , k _M-1 }.

Referring to Table 6, it can be seen that the subframes in which numbers are written in Table 7 are subframes for performing uplink transmission.

Through Table 7, the correlation between the uplink subframe and the downlink subframe can be clearly identified. The HARQ ACK / ANCK signal for the downlink subframe may be transmitted through an uplink subframe associated with the downlink subframe.

Referring to Table 7, when the uplink-downlink configuration is 0 and n is 2, the k value is 6. Therefore, HARQ ACK / NACK for the PDSCH received in subframe 6 of the previous frame is transmitted in uplink in subframe 2 of the next frame. If the uplink-downlink configuration is 4 and n is 3, then K = {6, 5, 4, 7}. Therefore, HARQ ACK / NACK for the PDSCH received in subframes 7, 8, 9, and 6 of the previous frame is transmitted in uplink in subframe 3 of the next frame.

Meanwhile, in downlink transmission, one CW may be transmitted as one CC in each subframe, and two CWs may be transmitted. One bit of the ACK / NACK signal is transmitted to one CW, and in the case of PUCCH format 1b used for transmitting the ACK / NACK signal, up to 4 bits may be transmitted through the channel selection. However, if there are component carriers that transmit data by 2 CW per subframe in downlink, it may be difficult to transmit an ACK / NACK signal in PUCCH format 1a / 1b. Therefore, in this case, up to 20 bits of HARQ ACK / NACK signals can be multiplexed and transmitted using PUCCH format 3.

However, in the case of transmitting the HARQ ACK / NACK signal in PUCCH format 3, 20-bit HARQ ACK / NACK signal can be transmitted in the TDD environment, but the HARQ ACK / NACK signal to be transmitted can also exceed 20 bits.

Table 8 schematically shows the number of bits required for multiplexing and transmitting an ACK / NACK signal when each downlink component carrier transmits data by 2CW in a TDD system in a carrier aggregation (CA) environment.

As shown in Table 8, it can be seen that in many cases the payload size for HARQ ACK / NACK signal transmission exceeds 20 bits. Therefore, in this case, even when transmitting the ACK / NACK signal in PUCCH format 3, it is difficult to multiplex the entire signal. For convenience of description, Table 8 describes a case in which each component carrier of the downlink transmits by 2CW, but even when only some component carriers of the downlink transmit 2CW, the payload size of the HARQ ACK / NACK signal to be transmitted is 20 Can go beyond the bit.

When the size of the HARQ ACK / NACK signal to be transmitted exceeds the payload size, the ACK / NACK signal may be transmitted through spatial bundling. For example, ACK / NACK signals for downlink component carriers or downlink subframes to be bundled may be bundled by a logical product operation. That is, when all HARQ ACK / NACK information for the downlink component carrier or the downlink subframe to be bundled is ACK, the ACK may be transmitted as a HARQ ACK / NACK signal representing the bundled ACK / NACK signal. When HARQ ACK / NACK information on at least one CC or subframe is NACK, NACK may be transmitted as a HARQ ACK / NACK signal representing a bundled ACK / NACK signal. In addition, when HARQ ACK / NACK information for at least one CC or subframe is DTX, the HARQ ACK / NACK signal representing the bundled ACK / NACK signal may be DTX.

The base station checks the representative value of the bundled ACK / NACK signals and determines whether to retransmit corresponding data. For example, when the bundled ACK / NACK signal value is ACK, the terminal receives all corresponding signals and determines that the decoding is successful and does not retransmit. For example, when the bundled ACK / NACK signal value is NACK or DTX, the base station may retransmit all corresponding data.

Even in HARQ ACK / NACK signal transmission using PUCCH format 3, when the size of the HARQ ACK / NACK signal to be transmitted exceeds 20 bits, the HARQ ACK / NACK signal may be transmitted using spatial bundling. Spatial bundling is an HARQ ACK / ANCK signal for each of a plurality of CWs transmitted to one CC in one downlink subframe. Therefore, in case of spatial bundling, HARQ ACK / NACK signals for each of the transmitted 2CWs may be bundled into one representative signal with respect to component carriers transmitting 2CWs in one downlink subframe. Hereinafter, in the present specification, for convenience of description, unless otherwise stated, 'spatial bundling' is referred to as 'bundling'. On the other hand, even if the component carrier can transmit 2CW, if it is scheduled to transmit only 1CW in the corresponding subframe can not be the target of bundling.

A method of bundling when transmitting 20 or more bits of HARQ ACK / NACK signals using PUCCH format 3 will be described. Hereinafter, unless noted otherwise, a case of bundling and transmitting a HARQ ACK / NACK signal of more than 20 bits in a TDD environment will be described.

The UE may bundle the HARQ ACK / NACK signal for the CW transmitted for each component carrier on the downlink subframe. Therefore, when one component carrier of a downlink subframe transmits one CW, the HARQ ACK / ANCK signal is not bundled. However, when two CWs are transmitted, the HARQ ACK / NACK signal for each CW is bundled. It can be transmitted as a bit HARQ ACK / NACK signal.

The method of bundling may be predetermined between the terminal and the base station, or may be delivered to the terminal through higher layer signaling. When transmitting the HARQ ACK / NACK signal in PUCCH format 3, if more than 11 bits, dual RM (Reed-Muller) coding may be used as a channel coding method.

RM (Reed-Muller) code is a kind of linear error correction code used in communication and has orthogonality. The RM code is represented by RM (r, d), where r is the order of the code and d is the length of the codeword (2 ^d ). RM (0, d) is a repetition code, and RM (d-1, d) is a parity check code.

The generation matrix of the RM code having length n = 2 ^d may be expressed as follows.

Where subset

As for, n-dimensional space

In instruction vector

Define as

In the same way,

In the following, a binary operation (binary operation) is called a wedge product.

The field

Is the d-dimensional vector space in. Therefore, it can be described as follows.

Where n-dimensional space

For a vector of length n v ₀ = (1, 1, 1, 1, 1,…, 1, 1, 1) and vector vi

.

Where H _i is

In hyperplane (d-1 dimension).

An RM (d, r) code of order r, length n = 2 ^d can be generated by wedge product up to the r th of v _o and v _i .

Hereinafter, in the case where dual RM coding is applied in a TDD environment, a description will be given of bundling and transmitting a HARQ ACK / NACK signal of 20 bits or more in PUCCH format 3.

9 is a configuration diagram schematically illustrating an embodiment of a configuration of a terminal (UE) to which the present invention is applied.

The terminal configures a HARQ signal for the received PDSCH signal. When the HARQ ACK / NACK signal to be transmitted exceeds 20 bits, HARQ ACK / ANCK signals (bits) are input to the bundling unit 910. Component carriers transmitted in the downlink subframe may transmit 1CW (codeword) or 2CW. The bundling unit 910 bundles HARQ ACK / NACK signals for component carriers on which 2CW is transmitted. Whether to bundle HARQ ACK / NACK signals for which component carrier of a downlink subframe may be predetermined between the terminal and the base station or may be delivered to the terminal through higher layer signaling.

The bundled HARQ ACK / NACK signal is transmitted to the ordering unit 920. The alignment unit 920 orders the input HARQ ACK / NACK signals so that HARQ ACK / ANCK signals (bits) bundled in each of the dual coding units are input evenly. The ordered HARQ ACK / NACK signal is determined which of the two RM coding units 940a and 940b is input to the RM coding unit. At this time, the alignment unit 920 may align the HARQ ACK / NACK signal in consideration of interleaving when inputting the HARQ ACK / NACK signal to the RM coding units 940a and 940b.

HARQ ACK / NACK signals aligned by the alignment unit 920 are input to the segmentation unit 930.

The segmentation unit 930 divides the input HARQ ACK / NACK signal into segments for each HARQ ACK / NACK signal and inputs them to the RM coding units 940a and 940b. The segmentation unit 930 inputs HARQ ACK / NACK signals to be input to the first RM coding unit 940a according to the sorted order, to the first RM coding unit 940a, and to the second RM coding unit 940b. HARQ ACK / ANCK signals to be input are input to the second RM coding unit 940b. As described above, dual RM coding may support channel coding of HARQ ACK / ANCK signals having a payload size of more than 11 bits.

The RM coding units 940a and 940b perform channel coding through Reed-Muller (RM) coding. Each RM coding unit 940a, 940b can process up to 11 bits at a time. Therefore, the alignment unit 920 arranges the blocks of the HARQ ACK / NACK signal to be input to each RM coding unit to be 11 bits or less. The alignment unit 920 is equally divided into two HARQ ACK / ANCK blocks having a length of Ceil (N / 2) and N-Ceil (N / 2) for the payload size (N) of the HARQ ACK / NACK signal. can be sorted to be segmented. In this case, the Ceil function outputs the minimum value among integers greater than or equal to the corresponding value (here, N / 2).

A block of HARQ ACK / NACK signals input to each of the RM coding units 940a and 940b is modulated into 12 QPSK symbols, and interleaved and input to the Discrete Fourier Transformation (DFT) units 950a and 950b. The DFT processed signal is IFFT processed by the inverse fast fourier transform (IFFT) units 960a and 960b and transmitted on two slots.

Herein, for convenience of description, a modulation scheme and a channel coding scheme are described in detail. However, the present invention is not limited thereto and may be applied to various modulation schemes and channel coding schemes. In addition, it should be noted that the terminal of the system to which the present invention is applied may include a configuration for processing an additional process for processing HARQ ACK / NACK signals in addition to the above configurations.

10 is a diagram schematically illustrating another embodiment of a configuration of a terminal to which the present invention is applied.

The embodiment of FIG. 10 includes a plurality of segmentation units 930a and 930b as compared to the embodiment of FIG. 9. In this case, each segmentation unit 930a, 930b receives an HARQ ACK / NACK signal input to each of the RM coding units 940a, 940b from the alignment unit 920, and receives the HARQ ACK / NACK signal for each RM coding unit 940a, 940b. The input process can be parallelized. The first segmentation unit 930a receives the HARQ ACK / ANCK signal to be input to the first RM coding unit 940a from the alignment unit 920 to perform segmentation, and to segment the HARQ ACK / NACK signal to the first RM. Input to coding unit 940a. In addition, the second segmentation unit 930b receives the HARQ ACK / ANCK signal to be input to the second coding unit 940b from the alignment unit 920 to perform segmentation, and performs segmentation on the segmented HARQ ACK / NACK signal. 2 is input to the RM coding unit 940b. Since the procedures performed by both segmentation units 930a and 930b are processed in parallel in each segmentation unit 930a and 930b, the processing speed of the entire process can be increased.

11 is a flowchart schematically illustrating an operation between a base station and a terminal in a system to which the present invention is applied.

The base station may transmit information necessary for the terminal to transmit the HARQ ACK / NACK signal to the terminal through higher layer signaling such as RRC signaling (S1110). At this time, the information required for the terminal to transmit the HARQ ACK / NACK signal includes information on the method and / or the object of the bundling and the alignment of the HARQ ACK / NACK signal. On the other hand, the information required for the terminal to transmit the HARQ ACK / NACK signal may be predetermined between the terminal and the base station in addition to the method to be delivered to the terminal through the higher layer signaling as described above.

The base station transmits data to the terminal through the downlink transmission (S1120). Information is transmitted on a control channel such as PUCCH and a data channel such as PDSCH through downlink transmission. The terminal transmits a HARQ ACK / NACK signal to the base station for the information transmitted on the PDSCH.

The UE configures a HARQ ACK / NACK signal with respect to the information received on the PDSCH (S1130). In case of transmitting the HARQ ACK / NACK signal in PUCCH format 3 in the TDD environment, if the payload size of the entire HARQ ACK / ANCK signal exceeds 20 bits, the payload size is readjusted through bundling as described above, and the HARQ ACK is performed. Can transmit / ANCK signal. In this case, a method of bundling performed by the UE and an ordering method for channel coding each HARQ ACK / NACK signal will be described later.

The terminal transmits the configured HARQ ACK / NACK signal to the base station in the PUCCH format 3 (S1140).

12 is a flowchart schematically illustrating RM coding through bundling / aligning / segmentation in order to transmit a HARQ ACK / NACK signal in PUCCH format 3 in a terminal of a system to which the present invention is applied.

The terminal checks the number of bits of the HARQ ACK / NACK signal to be transmitted (S1210). If the total HARQ ACK / NACK signal to be transmitted does not exceed 20 bits, the UE may multiplex and transmit HARQ ACK / NACK signals in PUCCH format 3. If the total HARQ ACK / NACK signal to be transmitted exceeds 20 bits, the UE needs to perform bundling to transmit the ACK / NACK signals in PUCCH format 3.

When the number of bits of the HARQ ACK / NACK signal to be transmitted exceeds 20 bits, the terminal performs bundling on the HARQ ACK / NACK signal (S1220).

Bundling can be performed in a variety of ways.

The base station may specifically specify an object of bundling, and may transmit information on the object of bundling to a terminal through higher layer signaling. The base station may specify the HARQ ACK / NACK signal to be bundled, in consideration of the number of bits of the total HARQ ACK / ANCK signal to be transmitted after bundling, the communication environment, the performance of the terminal. For example, in order to prevent unnecessary retransmissions, a component carrier on a downlink subframe in which channel conditions are expected to be both NACK and NACK signals for both CWs is expected to be NACK. It can be specified to bundle the HARQ ACK / NACK signal for. In this case, the base station may estimate the downlink channel state based on information such as CQI, RSRP / RSRQ, and reciprocity between uplink and downlink channels.

As a result of the bundling, the base station specifies the HARQ ACK / NACK signal to be bundled so that the payload size of the entire HARQ ACK / NACK signal to be transmitted does not exceed 20 bits.

In addition, the base station does not specify a specific object of bundling, and may determine and transmit requirements for a start point, an execution direction, and an end point to start bundling to the terminal. For example, the base station may indicate a requirement regarding a starting point to perform bundling from a HARQ ACK / ANCK signal for a specific component carrier of a specific subframe, for example, a major carrier of the first received subframe. For example, the base station may dictate the requirements regarding the direction of execution so that bundling proceeds along the frequency axis or time axis. For example, the base station may indicate a requirement regarding an end point to terminate bundling when the number of bits of the entire HARQ ACK / ANCK signal to be transmitted does not exceed 20 bits or a predetermined number of bits. In this case, the base station may determine the uplink channel state and perform bundling until the number of HARQ ACK / NACK bits to be transmitted is increased to increase the transmission power per bit when the channel state is bad.

Information regarding bundling, for example, an HARQ ACK / NACK signal to be bundled, or a direction and end time of bundling may be predetermined between the terminal and the base station, and may be determined through higher layer signaling such as RRC signaling from the base station. It may be delivered to the terminal.

If bundling is performed such that the number of bits that can be transmitted in PUCCH format 3 is performed, the UE aligns the HARQ ACK / NACK signal (S1230). At this time, the bundled HARQ ACK / NACK signals may be represented as a representative HARQ ACK / NACK signal as described above.

As described above, in the system to which the present invention is applied, 20-bit or more HARQ ACK / NACK signals are bundled and transmitted in PUCCH format 3. Accordingly, the terminal performs channel coding using dual RM coding. In this case, the UE may align the bundled ACK / NACK signal to be evenly distributed to both RM coders, thereby equalizing the performance of both RM coders and performing effective coding.

The alignment method of the HARQ ACK / NACK signal according to the present invention is as follows.

(1) Alignment of Bundled HARQ ACK / NACK Signals

First, the bundled HARQ ACK / NACK signal is evenly distributed to each RM coder of the dual RM coder.

The UE may distribute the bundled HARQ ACK / NACK signals one by one in turn to each coder of the dual RM coder according to the bundled order. In addition, the UE may arrange such that one HARQ ACK / NACK bundled to each RM coder is distributed according to an order on a time axis or a frequency axis of a subframe or component carrier corresponding to each bundled HARQ ACK / NACK signal.

(2) Alignment of Unbundled HARQ ACK / NACK Signals

The UE evenly distributes the unbundled HARQ ACK / NACK signal to each RM coder. At this time, since the bundled HARQ ACK / NACK signal is already distributed, the terminal aligns the remaining unbundled HARQ ACK / NACK signal except for the bundled HARQ ACK / NACK signal.

Unbundled HARQ ACK / NACK signals may be aligned along the time axis or along the frequency axis. At this time, the HARQ ACK / NACK signal is aligned along the time axis means that the HARQ ACK / NACK signal is aligned according to the time axis order of the subframe corresponding to the HARQ ACK / NACK signal. At this time, the HARQ ACK / NACK signal is aligned along the frequency axis means that the HARQ ACK / NACK signal is aligned according to the frequency axis order of the component carrier corresponding to the HARQ ACK / NACK signal. Regarding how much unbundled HARQ ACK / NACK signal is distributed to each RM coder along the time axis or along the frequency axis, each RM has a HARQ ACK / NACK signal, taking into account the length of the entire HARQ ACK / NACK signal to be transmitted. Can be evenly distributed. Here, the entire HARQ ACK / NACK signal to be transmitted means a HARQ ACK / NACK signal in which bundling is performed to be transmitted in PUCCH format 3. For example, when the total length is N, the signal of Ceil (N / 2) may be distributed to the first RM coder, and the signal of N-Ceil (N / 2) may be distributed to the second RM coder.

It may be aligned by interleaving the unbundled HARQ ACK / NACK signals. Accordingly, the unbundled HARQ ACK / NACK signal may be aligned to be input to each RM coder alternately for each subframe along the time axis. For example, an unbundled ACK / NACK signal for the first subframe may be input to the first RM coder and an unbundled HARQ ACK / NACK signal for the second subframe may be input to the second RM coder. In addition, the unbundled HARQ ACK / NACK signal can be arranged to be input to each RM coder alternately for each component carrier along the frequency axis. For example, an unbundled ACK / NACK signal for the first component carrier may be input to the first RM coder, and an unbundled HARQ ACK / NACK signal for the second component carrier may be input to the second RM coder.

A method of grouping downlink subframes into a group corresponding to each RM coder and arranging HARQ ACK / NACK signals for subframes of a group corresponding to each RM coder to be input may be considered. In this case, the group of subframes is formed such that the number of bundled HARQ ACK / NACKs corresponding to the subframe of each group is equal or maximally equal.

The information on the method of aligning the HARQ ACK / NACK signal as described above may be predetermined between the terminal and the base station, or may be delivered to the terminal through higher layer signaling.

The aligned HARQ ACK / NACK signal is segmented in channel coding units (S1240). HARQ ACK / ANCK signals are segmented in the sorted order and input to each RM coder. In this case, in order to increase the overall processing speed as described above, a segmentation device corresponding to the number of RM coders may be used. When the segmentation device is used for each RM coder, the HARQ ACK / NACK signal may be segmented and input to each RM coder in parallel.

Each RM coder performs RM coding (1250). The modulation symbols output from each RM coder are interleaved, processed by Discrete Fourier Transformation (DFT), and then processed by Inverse Fast Fourier Transformation (IFFT).

Subsequently, the HARQ ACK / ANCK signal is transmitted in 2 slots in PUCCH format 3 (S1270).

Hereinafter, a method of aligning a HARQ ACK / NACK signal in consideration of bundling according to the present invention will be described in detail. 9 and 10, the HARQ ACK / NACK signal is bundled in the bundling unit 910 and aligned in the alignment unit 920. HARQ ACK / NACK signals are segmented in sorted order and input to the RM coder.

13 to 17 schematically illustrate bundling and alignment of HARQ ACK / NACK signals performed in a system to which the present invention is applied. 13 to 17 illustrate four downlink subframes associated with one uplink subframe, and considering the arrangement of subframes and component carriers when four component carriers are transmitted in each subframe, The bundling and alignment of HARQ ACK / NACK signals are described.

In FIG. 13 to FIG. 17, it is assumed that CC1 and CC2 may transmit 2CW among component carriers (CC) for convenience of description. 'A / N' means HARQ ACK / NACK signal for CW transmitted by the component carrier in the corresponding subframe, and the number next to 'A / N' indicates the sort order. A circle (○) indicates that the corresponding HARQ ACK / NACK signals are bundled. An X mark indicates that the CC may transmit 2CW, but only 1CW is scheduled in a corresponding subframe. Therefore, the HARQ ACK / NACK signal for the X-marked CW is not transmitted.

For convenience of description, in FIG. 13 to FIG. 17, in order to transmit the HARQ ACK / NACK signal in the PUCCH format 3, when the bundling is performed only two times, the payload size of the entire HARQ ACK / NACK signal does not exceed 20 bits. However, in the case of additionally performing bundling, the contents described in the following embodiments may be equally applied.

In addition, the object of bundling may be determined according to a predetermined method between the terminal and the base station, or may be delivered to the terminal through higher layer signaling. For convenience of description, in FIGS. 13 to 17, it is assumed that bundling is performed in subframe 1 and subframe 2. In the case of FIG. 13 to FIG. 17, since two bundlings are required to have 20 bits or less of the HARQ ACK / NACK signal, additional bundling is necessary when bundling is performed once in subframe 1 and subframe 3, respectively. Not.

FIG. 13 illustrates an embodiment of aligning an HARQ ACK / NACK signal along a time axis.

Referring to FIG. 13, in subframe 1, HARQ ACK / NACK signals A / N0 and A / N1 for CC1 are bundled and aligned to be distributed to the first RM coding unit. Further, in subframe 3, HARQ ACK / NACK signals A / N4 and A / N5 for CC1 are bundled and arranged to be distributed to the second RM coding unit. Thus, the bundled HARQ ACK / NACK signal is evenly distributed to each of the dual RM coders.

The HARQ ACK / NACK signal may be arranged such that a bundled HARQ ACK / NACK signal is input first for each RM coder, followed by an unbundled HARQ ACK / NACK signal.

Unbundled HARQ ACK / NACK signals are arranged in order along the time axis. The HARQ ACK / NACK signal corresponding to CC1 of subframe 3 and the HARQ ACK / NACK signal corresponding to CC1 of subframe 3 are bundled and already distributed to the first RM coder and the second RM coder. Exclude from signal alignment. Accordingly, the corresponding unbundled HARQ ACK / NACK signal along the time axis from CC1 of subframe 2 is first aligned to be input to the first RM coder. If the alignment of the HARQ ACK / NACK signal corresponding to subframe 1 to subframe 4 is completed for the same component carrier, the HARQ ACK / NACK signal for the next component carrier can be aligned along the time axis. The HARQ ACK / NACK signal to be input to the second RM coder is also aligned along the time axis.

At this time, since CC1 is scheduled to transmit 1CW in subframe 2 and CC2 is scheduled to transmit 1CW in subframe 1, A / N3 and A / N9 are not transmitted.

FIG. 14 illustrates an embodiment of arranging HARQ ACK / NACK signals by applying interleaving along a time axis.

Referring to FIG. 14, HARQ ACK / NACK signals A / N0 and A / N1 for CC1 in subframe 1 are bundled and aligned to be distributed to the first RM coding unit. In addition, in subframe 3, the HARQ ACK / NACK signals A / N4 and A / N5 for CC1 are bundled and arranged to be distributed to the second RM coding unit. Thus, the bundled HARQ ACK / NACK signal is evenly distributed to each of the dual RM coders.

Unbundled HARQ ACK / NACK signals are interleaved along the time axis. The HARQ ACK / NACK signal corresponding to CC1 of subframe 3 and the HARQ ACK / NACK signal corresponding to CC1 of subframe 3 are bundled and already distributed to the first RM coder and the second RM coder. Exclude from signal alignment. Accordingly, alignment of the HARQ ACK / ANCK signal for each CW is started from CC1 of subframe 2. Since interleaving is applied, the unbundled HARQ ACK / NACK signals corresponding to each CW are aligned along the time axis so that they are input one by one to the first RM coder and the second RM coder. If the alignment of the HARQ ACK / NACK signal corresponding to subframe 1 to subframe 4 is completed for the same component carrier, the HARQ ACK / NACK signal for the next component carrier can be aligned along the time axis.

FIG. 15 illustrates an embodiment of aligning an HARQ ACK / NACK signal along a frequency axis.

Referring to FIG. 15, in subframe 1, HARQ ACK / NACK signals A / N0 and A / N1 for CC1 are bundled and aligned to be distributed to the first RM coding unit. In addition, in subframe 3, the HARQ ACK / NACK signals A / N12 and A / N13 for CC1 are bundled and arranged to be distributed to the second RM coding unit. Thus, the bundled HARQ ACK / NACK signal is evenly distributed to each of the dual RM coders.

Unbundled HARQ ACK / NACK signals are arranged in order along the frequency axis. The HARQ ACK / NACK signal corresponding to CC1 of subframe 1 and the HARQ ACK / NACK signal corresponding to CC1 of subframe 3 are bundled and already distributed to the first RM coder and the second RM coder. Exclude from / NACK signal alignment. Therefore, the corresponding unbundled HARQ ACK / NACK signal is first aligned to the first RM coder from the CC2 of the subframe 1 along the time axis. When the alignment of the HARQ ACK / NACK signals corresponding to CC1 to CC4 for the same subframe is completed, the HARQ ACK / NACK signal may be aligned along the frequency axis for the next subframe. The HARQ ACK / NACK signal to be input to the second RM coder is also aligned along the frequency axis.

FIG. 16 illustrates an embodiment of arranging HARQ ACK / NACK signals by applying interleaving along a frequency axis.

Referring to FIG. 16, HARQ ACK / NACK signals A / N0 and A / N1 for CC1 in subframe 1 are bundled and aligned to be distributed to the first RM coding unit. In addition, in subframe 3, the HARQ ACK / NACK signals A / N12 and A / N13 for CC1 are bundled and arranged to be distributed to the second RM coding unit. Thus, the bundled HARQ ACK / NACK signal is evenly distributed to each of the dual RM coders.

Unbundled HARQ ACK / NACK signals are interleaved along the frequency axis. The HARQ ACK / NACK signal corresponding to CC1 of subframe 3 and the HARQ ACK / NACK signal corresponding to CC1 of subframe 3 are bundled and already distributed to the first RM coder and the second RM coder. Exclude from signal alignment. Accordingly, alignment of the HARQ ACK / ANCK signal for each CW is started from CC2 of subframe 1. Since interleaving is applied, the unbundled HARQ ACK / NACK signals corresponding to each CW are aligned along the frequency axis so that they are input one by one to the first RM coder and the second RM coder. When the alignment of the HARQ ACK / NACK signals corresponding to CC1 to CC4 for the same subframe is completed, the HARQ ACK / NACK signal may be aligned along the frequency axis for the next subframe.

FIG. 17 illustrates an embodiment in which the number of subframes is equally grouped to align HARQ ACK / NACK signals to correspond to each RM coder for each group.

Referring to FIG. 17, downlink subframes are grouped into groups (subframes 1 and 2) corresponding to the first RM coder and groups (subframes 3 and 4) corresponding to the second RM coder. The HARQ ACK / NACK signals for the subframes of the group corresponding to the RM coder are arranged to be input. At this time, each group should be equal to or equal to the number of HARQ ACK / NACK signals bundled for each group.

In the case of FIG. 17, it can be seen that the number of bundled HARQ ACK / NACK signals of the group corresponding to the first RM coder and the group corresponding to the second RM coder are the same one by one.

In FIG. 17, the subframes 1 and 2 are grouped into one group, and the subframes 3 and 4 are grouped into one group, but the present invention is not limited thereto. For example, in the case of FIG. 17, subframes 1 and 4 are grouped into one group, and subframes 2 and 3 are grouped into one group so that the number of bundled AHRQ ACK / NACK signals is evenly distributed to each group. The technical ideas can be applied in the same way.

Until now, in the embodiments of FIGS. 13 to 17, four downlink subframes are associated with one uplink subframe and four component carriers are transmitted in each subframe, and two component carriers of the component carriers are 2CW. For the convenience of description, this is for convenience of description and the present invention is not limited thereto and may be equally applied to various downlink subframes and carrier aggregation environments.

18 is a block diagram schematically illustrating an example of a configuration of a base station and a terminal in a system to which the present invention is applied.

The terminal 1810 may include a transceiver 1830, a storage 1840, and a controller 1850. The base station 1820 may include a transceiver 1860, a storage 1870, and a controller 1880.

The terminal 1810 transmits and receives necessary information through the transceiver 1830. For example, the terminal transmits / receives information on the HARQ ACK / NACK signal configuration transmitted by the base station 1820, for example, information on the PUCCH format, information / instruction on the bundling method and / or alignment method of the HARQ ACK / NACK signal, and the like. It may be received through the unit 1830.

The storage unit 1840 stores information necessary for the terminal 1810 to perform wireless communication on the network. The storage unit 1840 may store information on a HARQ ACK / NACK signal configuration, for example, information on a PUCCH format, information / instruction on a bundling method and / or an alignment method of a HARQ ACK / NACK signal, and the like. In addition, the storage unit 1840 may measure and store measurement information to be reported to the base station, for example, CQI, RSRP, RSRQ, and the like.

The controller 1850 may be connected to the transceiver 1830 and the storage 1840 to control them. 9 and 10, the controller 1850 may include a bundling unit, an alignment unit, a segmentation unit, a dual RM coding unit, a DFT unit, and an IFFT unit. The controller 1850 may be configured based on information on a HARQ ACK / NACK signal configuration stored in the storage 1840, for example, information on a PUCCH format or information / instruction on a bundling method and / or an alignment method of a HARQ ACK / NACK signal. When transmitting the HARQ ACK / NACK signal in PUCCH format 3, performing bundling for more than 20 bits HARQ ACK / NACK signal, aligning HARQ ACK / ANCK signal for RM coding and subsequent processes in consideration of bundling ) Can be performed. The controller 1850 may channel-code the aligned HARQ ACK / NACK signal and perform DFT / IFFT processing to transmit the received HARQ ACK / NACK signal through the transceiver 1830.

The base station 1820 may transmit and receive necessary information through the transceiver 1860. For example, the base station 1820 may transmit information / instructions necessary for configuring a HARQ ACK / NACK signal to be performed by the terminal 1810 through the transceiver 1860.

The storage unit 1870 stores information necessary for the base station 1820 to perform wireless communication on the network. The storage unit 1870 may store information necessary for configuring the HARQ ACK / NACK signal to be performed by the terminal, for example, information for bundling and aligning the HARQ ACK / NACK signal. In addition, the storage unit 1870 may store measurement information transmitted from the terminal, for example, CQI, RSRP, RSRQ, and the like.

The controller 1880 may be connected to the transceiver 1860 and the storage 1870 to control them. The controller 1880 determines a bundling object and method of HARQ ACK / NACK signals to be performed by the terminal based on channel state information such as CQI, RSRP / RSRQ, and received uplink data for the channel state transmitted from the terminal 1810. In consideration of bundling, a method of arranging HARQ ACK / NACK signals to be performed by the UE may be determined. The controller 1880 may transmit information about the determined method to the terminal 1810 through the transceiver 1860. In addition, the controller 1880 may determine a configuration method of the HARQ ACK / NACK signal transmitted by the terminal 1810 and decode the HARQ ACK / NACK signal based on the information / instruction transmitted to the terminal.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders or simultaneously . In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

Claims

A method for processing a HARQ ACK / NACK signal of a terminal transmitting a HARQ ACK / NACK signal in a PUCCH format 3 in a time division duplex (TDD) environment,
Bundling a predetermined HARQ ACK / NACK signal among HARQ ACK / NACK signals;
Aligning transmission target HARQ ACK / NACK signals including the bundled HARQ ACK / NACK signals;
Segmenting the aligned transmission target HARQ ACK / NACK signals; And
Channel coding the segmented transmission target HARQ ACK / NACK signals according to the sorted order;
The channel coding is performed via a dual coder,
The segmented transmission target HARQ ACK / NACK signal is dividedly input to each of the dual coders,
And in the aligning step, aligning the bundled HARQ ACK / NACK signals to be evenly distributed to each of the dual coders.

A terminal device for transmitting a HARQ ACK / NACK signal in PUCCH format 3 in a time division duplex (TDD) environment,
A bundling unit for bundling HARQ ACK / NACK signals;
An alignment unit for aligning a transmission target HARQ ACK / NACK signal including a bundled HARQ ACK / NACK signal;
A segmentation unit for segmenting the aligned transmission target HARQ ACK / NACK signal;
A coding unit configured to channel code the segmented transmission target HARQ ACK / NACK signals according to the sorted order;
The coding unit is composed of a dual coder,
The segmentation unit divides the segmented transmission target HARQ ACK / NACK signal into the dual coder,
And the alignment unit aligns a transmission target HARQ ACK / NACK signal so that the bundled HARQ ACK / NACK signal is evenly distributed to the dual coder.