KR20190014901A - Method, apparatus, and system for harq-ack multiplexing in wireless communication system - Google Patents

Abstract

The present invention proposes a scheme for preventing a misunderstanding of a HARQ-ACK bit sequence between a base station and user equipment when the user equipment having a code block group (CBG)-based transmission performs HARQ-ACK multiplexing in a mobile communication system. The counter-downlink assignment index (counter-DAI) and the total-DAI are set independently in a transport block (TB)-based transmission and the CBG-based transmission, so that the user equipment can know whether the TB-based transmission has failed or the CBG-based transmission has failed to be received.

Description

Technical Field [0001] The present invention relates to a HARQ-ACK multiplexing method, an apparatus, and a system for a HARQ-ACK multiplexing in a wireless communication system,

The present invention relates to a wireless communication system, and more particularly, to a downlink control channel and an uplink control channel for supporting HARQ-ACK multiplexing in a wireless communication system.

3GPP LTE (-A) defines uplink / downlink physical channels for physical layer signal transmission. For example, a physical uplink shared channel (PUSCH) which is a physical channel for transmitting data in the uplink, a physical uplink control channel (PUCCH) for transmitting a control signal, and a physical random access channel (PRACH) A physical downlink shared channel (PDSCH) for transmitting data in downlink, a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH) ).

A downlink control channel (PDCCH / EPDCCH) of the channels is a channel for transmitting uplink / downlink scheduling assignment control information, uplink transmission power control information, and other control information to one or a plurality of terminals. Since there is a limitation on the resources available for the PDCCH that can be transmitted at one time, it is not possible to allocate different resources to each terminal, and the control information should be transmitted to any terminal by sharing resources. For example, in 3GPP LTE (-A), four Resource Elements (REs) are grouped together to form REGs (Resource Element Groups), nine CCEs (Control Channel Elements), and one or a plurality of CCEs And informs the UE of a resource, and a plurality of UEs can share the CCE. Here, the number of CCEs to be combined is called CCE coupling level, and the resource to which CCE is allocated according to the possible CCE coupling level is called a search space. The search space may include a common search space defined for each base station and a terminal-specific or UE-specific search space defined for each terminal. The UE performs decoding on the number of possible CCE combining cases in the search space and can determine whether it corresponds to its own PDCCH through a user equipment (UE) identifier included in the PDCCH. Therefore, it takes a long time to decode the PDCCH and energy consumption is inevitable.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered connection network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

Generally, a mobile communication system has been developed to provide voice service while ensuring the user's activity. However, the mobile communication system is gradually expanding not only to voice but also to data service, and now it has developed to the extent of providing high-speed data service. However, in a mobile communication system in which a service is currently provided, a lack of resources and users demand higher speed services, and therefore, a more advanced mobile communication system is required.

As mentioned earlier, future 5G technologies require lower latency data transmission due to the emergence of new applications such as real-time control and tactile internet, The delay is expected to be reduced to 1ms. 5G aims to provide a data delay that is about 10 times lower than the conventional one. To solve this problem, 5G is expected to propose a communication system using a mini-slot having a shorter TTI period (e.g., 0.2ms) in addition to the existing slot (or subframe).

In mobile communication, a base station simultaneously uses a slot and a mini-slot to simultaneously support users having various requirements. In particular, it is expected to use slot / mini-slot multiplexing method to puncture a resource to be used as a slot to provide a low-delay service and to transmit a mini-slot. A user performing a slot-based operation may not be able to transmit information of one or more CBs (code blocks) of the slot by puncturing, and other users' information is transmitted to the corresponding CB, which causes considerable performance deterioration.

A TB (Transport Block), which is a unit transmitted from the 3GPP LTE (-A) to the PDSCH, is attached with a TB-CRC (Cyclic Redundancy Code) for detecting an error in TB, and is divided into several CBs . Each CB is equipped with a CB-CRC (Cyclic Redundancy Code) for detecting the CB error. When receiving the PDSCH, the UE transmits an ACK if no error is detected in the TB-CRC, and transmits a NACK when an error is detected in the TB-CRC. When the NACK is received, the base station determines that an error has occurred in the previous TB, and performs HARQ retransmission of all the CBs included in the TB. Therefore, if one CB is wrongly received in the current system, all the CBs included in the TB are retransmitted, so there is a high possibility that inefficient retransmission occurs. In order to solve this problem, CBG (Code Block Group) is constructed by grouping the CBs constituting the TB, and the success of the CBG is notified to the base station for each CBG, and the HARQ is retransmitted only for the CBGs in which the base station fails to receive.

An HARQ-ACK multiplexing scheme for notifying a base station of the success of data received from a plurality of carriers is required when a UE uses carrier aggregation (CA) in which one or more carriers are combined and transmitted. In addition, when the UE supports time division duplex (TDD), a HARQ-ACK multiplexing scheme is required to inform the base station of the success of data received in a plurality of subframes or slots. When the UE is configured to transmit a CBG-based HARQ-ACK, the UE may transmit a CBG-based HARQ-ACK and a TB-based HARQ-ACK. Therefore, signaling is required for the UE to know an appropriate HARQ-ACK bit sequence.

 In 3GPP LTE, a downlink assignment index (DAI) scheme is supported to support HARQ-ACK multiplexing. The DAI scheme used in the carrier merge transmits a 2-bit counter-DAI and a 2-bit total-DAI to the downlink control information for scheduling downlink data. The 2-bit counter- (PDSCH) to the current component carrier (or cell) is scheduled in 2 bits. That is, if the counter-DAI included in the downlink control information is i, the PDSCH scheduled by the downlink control information is 4 * n + i PDSCH. Where i is 0, 1, 2, 3, and n can be a natural number other than zero. The 2-bit total-DAI indicates the number of all PDSCHs scheduled for the entire component carrier (or cell) configured to the UE by 2 bits. That is, all downlink control information can have the same total-DAI value. If the value is j, it is found that the number of all PDSCHs scheduled for the entire component carrier (or cell) configured for the UE is 4 * m + j have. Where j is 0, 1, 2, 3, and m can be a natural number other than zero. The DAI scheme used in the TDD scheme is similar to the carrier merge scheme. In LTE Rel.8, only the 2-bit counter-DAI value is transmitted to the downlink control information for scheduling downlink data for a terminal using TDD. The 2-bit counter-DAI can inform the number of PDSCHs scheduled up to the present time in a subframe (or slot) by 2 bits, by multiplexing the HARQ-ACK. The 2-bit total-DAI value is transmitted to the downlink control information for scheduling uplink data. The 2-bit total-DAI can indicate the number of scheduled PDSCHs in all subframes (or slots) by multiplexing the HARQ-ACK in 2 bits. In LTE Rel.13, HARQ-ACK multiplexing is enabled by transmitting 2-bit counter-DAI and 2-bit total-DAI to the downlink control information for scheduling downlink data for a UE using carrier merging and TDD.

The present invention proposes a method for determining a HARQ-ACK bit sequence when a 3GPP NR system is configured to enable CBG-based transmission to a UE. The UE shall transmit N bits of HARQ-ACK bits for CBG-based transmission and 1 bit or 2bits of HARQ-ACK bits for TB-based transmission. If the UE does not receive any PDCCH, the UE can not know whether to transmit 1 bit or 2 bits of HARQ-ACK bits or N bits of HARQ-ACK bits. Therefore, a method of distinguishing between them is necessary.

The objects that can be achieved by the present invention are not limited to those specifically described herein.

According to an aspect of the present invention, a base station includes a counter-DAI and a total-DAI value for a TB-based transmission on a downlink control channel (e.g., PDCCH) And transmits downlink control information including a counter-DAI and a total-DAI value for the CBG-based transmission as a downlink control channel for scheduling the CBG-based transmission so that the downlink control information (e.g., DCI) And a base station processor for transmitting the downlink control information through a downlink control channel according to a TB-based transmission and a CBG-based transmission, and the terminal includes a downlink control information and a downlink control channel (E.g., PDSCH) associated with reception of the downlink control information and the downlink control channel Depending on the reception terminal includes a processor for generating a HARQ-ACK bit (s) sequence for transmitting in the uplink.

In order to solve the above technical problem, in a technical aspect of the present invention, a base station transmits downlink control information including a counter-DAI value for a TB-based transmission to a downlink control channel (e.g., PDCCH) (For example, DCI), and a method for configuring and transmitting downlink control information including a counter-DAI value for a CBG-based transmission as a downlink control channel for scheduling CBG-based transmission, A method for configuring downlink control information including a total-DAI value for TB-based transmission and a total-DAI value for CBG-based transmission according to a -DAI value, and a method for configuring downlink control information including a total- , And the UE transmits the downlink control information and the downlink control information to a downlink data channel (e.g., PDSCH) associated with reception of the downlink control channel Performing the decoding and the terminal includes a processor for generating the downlink control information and the HARQ-ACK bit (s) for transmitting an uplink in accordance with the reception of a DL control channel sequence.

In order to solve the above technical problem, in a technical aspect of the present invention, a base station transmits downlink control information including a counter-DAI value for a TB-based transmission to a downlink control channel (e.g., PDCCH) (For example, DCI), and a method for configuring and transmitting downlink control information including a counter-DAI value for a CBG-based transmission as a downlink control channel for scheduling CBG-based transmission, And a base station processor for transmitting the downlink control information through a downlink control channel, and the UE transmits the downlink control information including the total-DAI value to the downlink control information, And a downlink data channel (e.g., PDSCH) associated with the reception of the downlink control channel, And a greater control information and the HARQ-ACK bit (s) terminal processor for generating a sequence for transmitting an uplink in accordance with the reception of a DL control channel.

It will be understood by those skilled in the art that various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from the following detailed description of the invention, do.

According to the embodiment of the present invention, the UE can determine the HARQ-ACK bit (s) sequence with the overhead of small downlink control information (e.g., DCI). Therefore, it is expected that the transmission efficiency of the network between the base station and the terminal can be increased.

1 shows an example of a radio frame structure used in a wireless communication system.
2 shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.
3 is a view for explaining a physical channel used in a 3GPP system and a general signal transmission method using the same.
FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS).
5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
6 illustrates a configuration of a cell specific common reference signal.
FIG. 7 shows an example of a UL subframe structure used in a wireless communication system.
8 is a conceptual diagram illustrating a carrier aggregation (CA) technique.
FIG. 9 is a diagram for explaining Single Carrier Communication and Multiple Carrier Communication. FIG.
10 is a diagram showing an example in which a cross carrier scheduling technique is applied.
11 is a diagram illustrating a deployment scenario of a UE and a BS in an LTE and LAA service environment.
12 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention.
13 is a block diagram illustrating a transmission method between a terminal and a base station.
14 shows the DAI setting of the LTE Rel 13.
15 shows a DAI setting according to the first embodiment of the present invention.
FIG. 16 shows a HARQ-ACK bit sequence generation according to the first embodiment of the present invention.
17 shows a DAI setting according to the second embodiment of the present invention.
18 shows DAI settings according to a third embodiment of the present invention.
FIG. 19 illustrates HARQ-ACK bit sequence generation according to the third embodiment of the present invention.
FIG. 20 shows HARQ-ACK bit sequence generation according to the third embodiment of the present invention.
FIG. 21 shows HARQ-ACK bit sequence generation according to the third embodiment of the present invention.
22 shows a DAI setting according to another embodiment of the present invention.
23 shows a DAI setting according to another embodiment of the present invention.
24 shows a DAI setting according to another embodiment of the present invention.
FIG. 25 shows HARQ-ACK bit sequence generation according to another embodiment of the present invention.
26 shows a DAI setting according to yet another embodiment of the present invention.
FIG. 27 shows HARQ-ACK bit sequence generation according to still another embodiment of the present invention.
28 shows a DAI setting according to still another embodiment of the present invention.
29 shows a DAI setting according to another embodiment of the present invention.
30 shows HARQ-ACK bit sequence generation according to still another embodiment of the present invention.

As used herein, terms used in the present invention are selected from general terms that are widely used in the present invention while taking into account the functions of the present invention. However, these terms may vary depending on the intention of a person skilled in the art, custom or the emergence of new technology. Also, in certain cases, there may be a term arbitrarily selected by the applicant, and in this case, the meaning thereof will be described in the description of the corresponding invention. Therefore, it is intended that the terminology used herein should be interpreted relative to the actual meaning of the term, rather than the nomenclature, and its content throughout the specification.

Throughout the specification, when a configuration is referred to as being "connected" to another configuration, it is not limited to the case where it is "directly connected," but also includes "electrically connected" do. Also, when an element is referred to as " including " a specific element, it is meant to include other elements, rather than excluding other elements, unless the context clearly dictates otherwise. In addition, the limitations of " above " or " below ", respectively, based on a specific threshold value may be appropriately replaced with "

FIG. 1 shows an example of a radio frame structure used in a wireless communication system.

Particularly, FIG. 1 (a) shows a frame structure for a frequency division duplex (FDD) used in a 3GPP LTE / LTE-A system and FIG. 1 Time division duplex (TDD) frame structure.

Referring to FIG. 1, a radio frame used in the 3GPP LTE / LTE-A system has a length of 10 ms (307200 Ts) and is composed of 10 equal sized subframes (SF). 10 subframes within one radio frame may be assigned respective numbers. Here, Ts represents the sampling time, and is represented by Ts = 1 / (2048 * 15 kHz). Each subframe is 1 ms long and consists of two slots. 20 slots in one radio frame can be sequentially numbered from 0 to 19. [ Each slot has a length of 0.5 ms. The time for transmitting one subframe is defined as a Transmission Time Interval (TTI). The time resource may be classified by a radio frame number (or a radio frame index), a subframe number (also referred to as a subframe number), a slot number (or a slot index), and the like.

The wireless frame may be configured differently according to the duplex mode. For example, in the FDD mode, since the downlink transmission and the uplink transmission are divided by frequency, the radio frame includes only one of the downlink subframe and the uplink subframe for a specific frequency band. In the TDD mode, since the downlink transmission and the uplink transmission are divided by time, the radio frame includes both the downlink subframe and the uplink subframe for a specific frequency band.

Table 1 illustrates the DL-UL configuration of subframes in a radio frame in TDD mode.

In Table 1, D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe. The specific subframe includes three fields of Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and UpPTS (Uplink Pilot Time Slot). DwPTS is a time interval reserved for downlink transmission, and UpPTS is a time interval reserved for uplink transmission. Table 2 illustrates the configuration of the singular frames.

2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, Figure 2 shows the structure of the resource grid of the 3GPP LTE / LTE-A system. There is one resource grid per antenna port. Referring to FIG. 2, a slot includes a plurality of OFDM symbols in a time domain and a plurality of resource blocks (RB) in a frequency domain. The OFDM symbol also means one symbol period. Referring to FIG. 2, a signal transmitted in each slot may be expressed as a resource grid consisting of N ^{DL / UL} _RB * N ^RB _sc subcarriers and N ^{DL / UL} _symb OFDM symbols. have. Here, N ^DL _RB represents the number of resource blocks (RBs) in the downlink slot, and N ^UL _RB represents the number of _RBs in the UL slot. N ^DL _RB and N ^UL _RB depend on the DL transmission bandwidth and the UL transmission bandwidth, respectively. N ^DL _symb denotes the number of OFDM symbols in the downlink slot, and N ^UL _symb denotes the number of OFDM symbols in the UL slot. N ^RB _sc represents the number of subcarriers constituting one RB. The OFDM symbol may be referred to as an OFDM symbol, an SC-FDM (Single Carrier Frequency Division Multiplexing) symbol, or the like according to a multiple access scheme. The number of OFDM symbols included in one slot can be variously changed according to the channel bandwidth and the length of the cyclic prefix (CP). For example, in the case of a normal CP, one slot includes 7 OFDM symbols

In the case of an extended CP, one slot includes six OFDM symbols. Although FIG. 2 illustrates a subframe in which one slot is composed of seven OFDM symbols for convenience of description, embodiments of the present invention may be applied to subframes having a different number of OFDM symbols in a similar manner. Referring to FIG. 2, each OFDM symbol includes N ^{DL / UL} _RB * N ^RB _sc subcarriers in the frequency domain. The type of subcarrier may be a data subcarrier for data transmission, a reference signal subcarrier for transmission of a reference signal, a null subcarrier for a guard band or a direct current (DC) ≪ / RTI > The DC component is mapped to a carrier frequency (f ₀ ) in an OFDM signal generation process or a frequency up-conversion process. The carrier frequency is also referred to as the center frequency (f _c ).

One RB is defined as N ^{DL / UL} _symb consecutive OFDM symbols in the time domain (for example, seven), and N ^RB _scrambled (e.g., twelve) consecutive subcarriers in the frequency domain . For reference, a resource composed of one OFDM symbol and one subcarrier is referred to as a resource element (RE) or tone. Therefore, one RB consists of N ^{DL / UL} _symb * N ^RB _sc resource elements. Each resource element in the resource grid can be uniquely defined by an index pair (k, 1) in one slot. k is an index assigned from 0 to N ^{DL / UL} _RB * N ^RBsc -1 in the frequency domain, and 1 is an index assigned from 0 to N ^{DL / UL} _symb -1 in the time domain.

One RB is mapped to one physical resource block (PRB) and one virtual resource block (VRB). The PRB is defined as N ^{DL / UL} _symb (e.g., 7) consecutive OFDM symbols or SC-FDM symbols in the time domain, and N ^RB _scrambled (e.g., twelve) Is defined by the subcarrier. Therefore, one PRB consists of N ^{DL / UL} _symb * N ^RB _sc resource elements. Two RBs, one in each of two slots of the subframe occupying N ^RB _sc consecutive identical subcarriers in one subframe, are called a PRB pair. The two RBs constituting the PRB pair have the same PRB number (or PRB index).

In order for the UE to receive a signal from the eNB or to transmit a signal to the eNB, the time / frequency synchronization of the UE should be synchronized with the time / frequency synchronization of the eNB. since it can determine the time and frequency parameters necessary for the UE to perform the demodulation of the DL signal and the transmission of the UL signal at the correct time, as long as it is synchronized with the eNB.

3 is a view for explaining a physical channel used in a 3GPP system and a general signal transmission method using the same.

The terminal performs an initial cell search operation such as synchronizing with a base station when power is increased or newly enters a cell (S301). To this end, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from a base station and synchronizes with the base station and acquires information such as a cell ID have. Then, the terminal can receive the physical broadcast channel from the base station and acquire the in-cell broadcast information. Meanwhile, the UE can receive the downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.

Upon completion of the initial cell search, the UE receives more detailed system information by receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH) according to the information on the PDCCH (S302).

On the other hand, if the base station is initially connected or there is no radio resource for signal transmission, the terminal can perform a random access procedure (RACH) on the base station (steps S303 to S306). To this end, the UE transmits a specific sequence through a Physical Random Access Channel (PRACH) (S303 and S305), and receives a response message for the preamble on the PDCCH and the corresponding PDSCH S304 and S306). In case of the contention-based RACH, a contention resolution procedure can be additionally performed.

The UE having performed the procedure described above transmits PDCCH / PDSCH reception (S307) and physical uplink shared channel (PUSCH) / physical uplink control channel Control Channel, PUCCH) (S308). In particular, the UE receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the UE, and formats are different according to the purpose of use.

Meanwhile, the control information that the UE transmits to the base station through the uplink or receives from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI) ) And the like. In the case of the 3GPP LTE system, the UE can transmit control information such as CQI / PMI / RI as described above through PUSCH and / or PUCCH.

FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS). In particular, FIG. 4 illustrates a radio frame structure for transmission of a synchronous signal and a PBCH in a frequency division duplex (FDD). FIG. 4A illustrates a radio frame in a normal CP (normal cyclic prefix) SS and PBCH. FIG. 4 (b) shows transmission positions of SS and PBCH in a radio frame configured with an extended CP.

The UE obtains time and frequency synchronization with the cell when it is powered on or newly connected to the cell, and performs cell search such as detecting the physical cell identity N ^cell _ID of the cell cell search procedure. To this end, the UE receives a synchronization signal, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the eNB, synchronizes with the eNB, , ID) can be obtained.

Referring to FIG. 4, the SS will be described in more detail as follows. SS is divided into PSS and SSS. PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization, slot synchronization, and the like. SSS is used for frame synchronization, cell group ID, and / or cell CP configuration Information). Referring to FIG. 4, the PSS and the SSS are transmitted in two OFDM symbols of each radio frame, respectively. In order to facilitate inter Radio Access Technology ("RAT") measurement, the SS considers 4.6 ms, which is the Global System for Mobile communication (GSM) frame length, in the first slot of subframe 0 and the first slot of subframe 5 Respectively. Specifically, the PSS is transmitted in the last OFDM symbol of the first slot of the subframe 0 and the last OFDM symbol of the first slot of the subframe 5, respectively, and the SSS is transmitted from the second OFDM symbol at the end of the first slot of the subframe 0, Lt; RTI ID = 0.0 > OFDM < / RTI > The boundary of the corresponding radio frame can be detected through the SSS. The PSS is transmitted in the last OFDM symbol of the slot and the SSS is transmitted in the OFDM symbol immediately before the PSS. SS's transmit diversity scheme uses only a single antenna port and is not defined in the standard. That is, a single antenna port transmission or a UE transparent transmission scheme (e.g., Precoding Vector Switching (PVS), Time Switched Diversity (TSTD), Cyclic Delay Diversity (CDD)) can be used for SS transmission diversity .

The SS can represent a total of 504 unique physical layer cell IDs through a combination of three PSSs and 168 SSs. In other words, the physical layer cell IDs are allocated to 168 physical-layer cell-identifier groups, each group including three unique identifiers, such that each physical-layer cell ID is part of only one physical-layer cell- . Thus, the physical layer cell ID _{^{N cell ID = 3N (1)}} ID + N (2) ID is a physical-layer cell - the range of 0 [identifier group to the 167 number N ⁽¹⁾ _ID and the physical-layer cell - a unique number N ⁽²⁾ _ID of 0 to 2 indicating the physical-layer identifier in the identifier group. The UE may detect the PSS to know one of the three unique physical-layer identifiers and may detect the SSS to identify one of the 168 physical layer cell IDs associated with the physical-layer identifier. A ZC (Zadoff-Chu) sequence of length 63 is defined in the frequency domain and used as the PSS.

Referring to FIG. 4, since the PSS is transmitted every 5 ms, the UE can detect that the corresponding subframe is one of the subframe 0 and the subframe 5 by detecting the PSS. However, I do not know what it is. Therefore, the UE can not recognize the boundary of the radio frame only by the PSS. That is, frame synchronization can not be obtained with only PSS. The UE detects an SSS transmitted twice in one radio frame but transmitted as a different sequence and detects the boundary of the radio frame.

5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.

Referring to FIG. 5, a subframe is composed of 14 OFDM symbols. According to the subframe setting, the first to third OFDM symbols are used as a control region and the remaining 13 to 11 OFDM symbols are used as a data region. In the figure, R1 to R4 represent a reference signal (RS) or pilot signal for antennas 0 to 3. The RS is fixed in a constant pattern in the subframe regardless of the control region and the data region. The control channel is allocated to a resource to which the RS is not allocated in the control region, and the traffic channel is also allocated to the resource to which the RS is not allocated in the data region. Control channels allocated to the control region include a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid-ARQ Indicator CHannel (PHICH), and a Physical Downlink Control Channel (PDCCH).

The PCFICH informs the UE of the number of OFDM symbols used in the PDCCH for each subframe as a physical control format indicator channel. The PCFICH is located in the first OFDM symbol and is set prior to the PHICH and PDCCH. The PCFICH is composed of four REGs (Resource Element Groups), and each REG is distributed in the control area based on the cell ID (Cell IDentity). One REG is composed of four REs (Resource Elements). RE denotes a minimum physical resource defined by one subcarrier x one OFDM symbol. The PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).

The PHICH is used as a physical HARQ (Hybrid Automatic Repeat and Request) indicator channel to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for UL HARQ is transmitted. The PHICH consists of one REG and is cell-specific scrambled. The ACK / NACK is indicated by 1 bit and is modulated by BPSK (Binary Phase Shift Keying). The modulated ACK / NACK is spread with a spreading factor (SF) = 2 or 4. A plurality of PHICHs mapped to the same resource constitute a PHICH group. The number of PHICHs multiplexed into the PHICH group is determined by the number of spreading codes. The PHICH (group) is repetitized three times to obtain the diversity gain in the frequency domain and / or the time domain.

The PDCCH is allocated to the first n OFDM symbols of the subframe as the physical downlink control channel. Here, n is an integer of 1 or more and is indicated by the PCFICH. The PDCCH consists of one or more CCEs. The PDCCH notifies each terminal or group of terminals of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information. A paging channel (PCH) and a downlink-shared channel (DLSCH) are transmitted on the PDSCH. Therefore, the BS and the MS generally transmit and receive data via the PDSCH, except for specific control information or specific service data.

PDSCH data is transmitted to a terminal (one or a plurality of terminals), and information on how the terminals receive and decode PDSCH data is included in the PDCCH and transmitted. For example, if a particular PDCCH is CRC masked with an RNTI (Radio Network Temporary Identity) of " A ", and a DCI format called " C " Assume that information on data to be transmitted using information (e.g., transport block size, modulation scheme, coding information, etc.) is transmitted through a specific subframe. In this case, the UE in the cell monitors the PDCCH using its RNTI information, and if there is more than one UE having the " A " RNTI, the UEs receive the PDCCH, B " and " C ".

FIG. 6 illustrates the configuration of a cell specific common reference signal. In particular, Figure 6 illustrates a CRS structure for a 3GPP LTE system supporting up to four antennas.

[Equation 1]

Where k is a subcarrier index, 1 is an OFDM symbol index, p is an antenna port number, and ^{Nmax and DL} _RB represent the largest downlink bandwidth configuration, expressed as an integer multiple of N ^RB _sc .

The variables v and v _shift define positions in the frequency domain for different RSs, and v is given by

&Quot; (2) "

Where n _s is the slot number in the radio frame and the cell specific frequency transition is given by:

&Quot; (3) "

Referring to FIG. 6 and Equations 1 and 2, the current 3GPP LTE / LTE-A standard defines a cell-specific CRS used for demodulation and channel measurement among the various RSs defined in the corresponding system, To be transmitted over the entire downlink band. Also, in the 3GPP LTE / LTE-A system, the cell-specific CRS is used for demodulation of the downlink data signal, and thus is transmitted every antenna port for downlink transmission.

Meanwhile, the cell-specific CRS can be used not only for channel state measurement and data demodulation, but also for tracking after the UE acquires time synchronization and frequency synchronization of a carrier used for communication with the UE, It is also used for tracking.

FIG. 7 shows an example of a UL subframe structure used in a wireless communication system.

Referring to FIG. 7, the UL subframe may be divided into a control domain and a data domain in the frequency domain. One or several physical uplink control channels (PUCCHs) may be assigned to the control region to carry uplink control information (UCI). One or several physical uplink shared channels (PUSCHs) may be allocated to the data area of the UL subframe to carry user data.

In the UL subframe, subcarriers far away from each other based on a DC (Direct Current) subcarrier are used as a control region. In other words, the subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of the UL control information. The DC subcarrier is a component that is left unused for signal transmission and is mapped to the carrier frequency f ₀ in the frequency up conversion process. In one subframe, the PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency, and RBs belonging to the RB pair occupy different subcarriers in two slots. The PUCCH allocated as described above is expressed as the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, when frequency hopping is not applied, the RB pairs occupy the same subcarrier.

The PUCCH may be used to transmit the following control information.

- SR (Scheduling Request): Information used for requesting uplink UL-SCH resources. OOK (On-Off Keying) method.

- HARQ-ACK: A response to the PDCCH and / or a response to a downlink data packet (eg, codeword) on the PDSCH.

Indicates whether PDCCH or PDSCH has been successfully received. In response to a single downlink codeword, one bit of HARQACK is transmitted and two bits of HARQ-ACK are transmitted in response to two downlink codewords. The HARQ-ACK response includes positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission) or NACK / DTX. Here, the term HARQ-ACK is mixed with HARQ ACK / NACK and ACK / NACK.

- CSI (Channel State Information): Feedback information for the downlink channel. Multiple Input Multiple Output (MIMO) -related feedback information includes RI (Rank Indicator) and PMI (Precoding Matrix Indicator).

Hereinafter, a carrier aggregation technique will be described. 8 is a conceptual diagram illustrating carrier aggregation.

Carrier aggregation is a technique in which a radio communication system uses a frequency block or a (logical sense) cell composed of uplink resources (or component carriers) and / or downlink resources (or component carriers) Which is used as a single large logical frequency band. Hereinafter, the term "component carrier" is used for the convenience of description.

Referring to FIG. 8, the total system bandwidth (System BW) has a bandwidth of 100 MHz as a logical bandwidth. The total system bandwidth includes five component carriers, each of which has a bandwidth of up to 20 MHz. A component carrier comprises one or more contiguous subcarriers physically contiguous. In FIG. 8, each of the component carriers is shown to have the same bandwidth, but this is merely an example, and each component carrier may have a different bandwidth. In addition, although each component carrier is shown as being adjacent to each other in the frequency domain, this figure is shown in a logical concept, wherein each component carrier may physically be adjacent to or spaced from one another.

The center frequency may use different common carriers for each component carrier or common for physically contiguous component carriers. For example, assuming that all of the component carriers are physically adjacent in FIG. 8, the center carrier A can be used. Further, assuming that the respective component carriers are not physically adjacent to each other, the center carrier A, the center carrier B, and the like can be used separately for each component carrier.

In this specification, the component carrier may correspond to the system band of the legacy system. By defining a component carrier based on a legacy system, it is possible to provide backward compatibility and system design in a wireless communication environment in which an evolved terminal and a legacy terminal coexist. In one example, if the LTE-A system supports carrier aggregation, each component carrier may correspond to the system band of the LTE system. In this case, the component carrier may have any of the following bandwidths: 1.25, 2.5, 5, 10, or 20 Mhz.

The frequency band used for communication with each terminal when the entire system band is expanded by carrier aggregation is defined in units of component carriers. Terminal A can use 100 MHz, which is the entire system band, and performs communication using all five component carriers. The terminals B1 to B5 can use only a 20 MHz bandwidth and perform communication using one component carrier. Terminals C ₁ and C ₂ can use a 40 MHz bandwidth and each communicate using two component carriers. The two component carriers may be logically / physically adjacent or non-contiguous. The terminal C ₁ shows a case in which two non-adjacent component carriers are used and the terminal C ₂ shows a case in which two adjacent component carriers are used.

In the LTE system, one downlink component carrier and one uplink component carrier are used, while in the LTE-A system, a plurality of component carriers can be used as shown in FIG. A combination of a downlink component carrier or a corresponding downlink component carrier and a corresponding uplink component carrier may be referred to as a cell and a corresponding relationship between a downlink component carrier and an uplink component carrier may be indicated through system information .

At this time, the scheme of scheduling the data channel by the control channel may be classified into a link carrier scheduling method and a cross carrier scheduling method.

More specifically, link carrier scheduling schedules data channels only through the particular component carrier, such as existing LTE systems that use a single component carrier, over a particular component carrier. That is, the downlink grant / uplink grant transmitted to the PDCCH region of the downlink component carrier of a specific component carrier (or specific cell) can be scheduled only for the PDSCH / PUSCH of the cell to which the corresponding downlink component carrier belongs. That is, the search space, which is an area for attempting to detect the downlink grant / uplink grant, exists in the PDCCH region of the cell where the PDSCH / PUSCH to be scheduled is located.

On the other hand, in the cross carrier scheduling, when a control channel transmitted through a primary component carrier (Primary CC) using a Carrier Indicator Field (CIF) is transmitted through the main component carrier or through another component carrier Schedules the channel. In other words, a monitored cell (Monitored Cell or Monitored CC) of the cross-carrier scheduling is set, and the downlink grant / uplink grant transmitted in the PDCCH region of the monitored cell is set to PDSCH / PUSCH of a cell set to be scheduled in the corresponding cell Scheduling. That is, a search area for a plurality of component carriers is present in a PDCCH area of a cell to be monitored. Among the plurality of cells, system information is transmitted, an initial access attempt is made, and the PCell is set by transmission of uplink control information. The PCell is a downlink main component carrier and an uplink main component carrier corresponding to the downlink main component carrier .

9 is a diagram for explaining single carrier communication and multiple carrier communication. Particularly, FIG. 9A shows a subframe structure of a single carrier and FIG. 9B shows a subframe structure of multiple carriers.

Referring to FIG. 9A, a general wireless communication system performs data transmission or reception (in a frequency division duplex (FDD) mode) through one DL band and one UL band corresponding thereto , A radio frame is divided into an uplink time unit and a downlink time unit in a time domain and data transmission or reception is performed through an uplink / downlink time unit (time division duplex , TDD) mode). However, in recent wireless communication systems, introduction of a carrier aggregation technique using a larger UL / DL bandwidth by collecting a plurality of UL and / or DL frequency blocks in order to use a wider frequency band is being discussed. Carrier aggregation is an orthogonal frequency division multiplexing (OFDM) scheme that performs DL or UL communication by putting a fundamental frequency band divided into a plurality of orthogonal subcarriers on one carrier frequency in that DL or UL communication is performed using a plurality of carrier frequencies division multiplexing system. Hereinafter, each of the carriers collected by carrier aggregation is referred to as a component carrier (CC). Referring to FIG. 9 (b), three 20 MHz CCs can be grouped into UL and DL, respectively, so that a bandwidth of 60 MHz can be supported. Each CC may be adjacent or non-adjacent to one another in the frequency domain. FIG. 9B shows a case where the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetric, but the bandwidth of each CC can be determined independently. Asymmetric carrier aggregation in which the number of UL CCs is different from the number of DL CCs is also possible. A DL / UL CC specific to a particular UE may be referred to as a configured serving UL / DL CC in a particular UE.

The eNB may be used to communicate with the UE by activating some or all of the serving CCs configured in the UE, or by deactivating some CCs. The eNB can change the CC to be activated / deactivated, and can change the number of CCs to be activated / deactivated. When the eNB allocates a CC available for the UE in a cell-specific or UE-specific manner, at least one of the assigned CCs is used, as long as the CC allocation for the UE is not completely reconfigured or the UE does not perform a handover. One is not disabled. A CC that is not deactivated is referred to as a primary CC (PCC), and a CC that can be freely activated / deactivated by the eNB is called a secondary CC (SCC), unless it is a full reconfiguration of the CC assignment to the UE It is called. PCC and SCC may be distinguished based on control information. For example, specific control information may be set to be transmitted and received only via a specific CC, which may be referred to as PCC and the remaining CC (s) as SCC (s).

Meanwhile, 3GPP LTE (-A) uses the concept of a cell to manage radio resources. A cell is defined as a combination of DL resources and UL resources, that is, a combination of DL CC and UL CC. A cell may consist of DL resources alone, or a combination of DL resources and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of the DL resource (or DL CC) and the carrier frequency of the UL resource (or UL CC) . For example, a combination of a DL resource and a UL resource can be indicated by linkage of System Information Block Type 2 (SIB2). Here, the carrier frequency means a center frequency of each cell or CC. In the following,

a cell operating on a frequency is referred to as a primary cell or a PCC and a cell operating on a secondary frequency (or SCC) is referred to as a secondary cell (SCell) It is called. The carrier corresponding to PCell in the downlink is referred to as a downlink primary CC (DL PCC), and the carrier corresponding to PCell in the uplink is referred to as a UL primary CC (DL PCC). SCell refers to a cell that is configurable after a Radio Resource Control (RRC) connection is established and can be used to provide additional radio resources. Depending on the capabilities of the UE, a SCell may form together with the PCell a set of serving cells for the UE. The carrier corresponding to the SCell in the downlink is referred to as DL secondary CC (DL SCC), and the carrier corresponding to the SCell in the uplink is referred to as UL secondary CC (UL SCC)

do. For UEs that are in the RRC_CONNECTED state but no carrier aggregation is set or that do not support carrier aggregation, there is only one serving cell consisting of only PCell.

As previously mentioned, the term cell used in carrier aggregation is distinguished from the term cell, which refers to a geographical area in which a communication service is provided by a single eNB or a group of antennas. In order to distinguish between a cell designating a certain geographical area and a cell of carrier aggregation, a carrier aggregation cell is referred to as a CC and a cell in a geographical area is referred to as a cell. Quot;

In the existing LTE / LTE-A system, when multiple CCs are used together, it is assumed that the UL / DL frame time synchronization of the SCC coincides with the time synchronization of the PCC, assuming that the CCs that are not so far away in the frequency domain are clustered. However, there is a possibility that a plurality of CCs belonging to different frequency bands or spaced apart from each other in frequency, that is, a plurality of CCs having different propagation characteristics, may be gathered in the future. In this case, assuming that the time synchronization of the PCC and the time synchronization of the SCC are the same as in the conventional case, the synchronization of the DL / UL signal of the SCC may be seriously adversely affected.

Meanwhile, in the case of the LCT CC, among the radio resources operating in the LCT CC, radio resources available for transmission / reception of physical uplink / downlink channels and radio resources available for transmission / reception of physical uplink / The resources, as described above, are predetermined. In other words, the LCT CC is not configured to carry physical channels / signals through arbitrary time frequency in arbitrary time resources, but may be configured to transmit the physical channel / Signal should be configured to carry. For example, the physical downlink control channels may be configured only in the first OFDM symbol (s) of the OFDM symbols in the DL subframe, and the PDSCH may include the first OFDM symbol (s) that are likely to be mapped physical downlink control channels. Lt; / RTI > As another example, the CRS (s) corresponding to the antenna port (s) of the eNB are transmitted every subframe in the REs shown in Fig. 6 over the entire band regardless of the DL BW of the eNB. Accordingly, when the number of antenna ports of the eNB is 1, REs indicated by '0' in FIG. 6 are '0', '1', '2' and ' 3 'can not be used for other downlink signal transmission. In addition, there are various constraints on the composition of the LCT CC, and these constraints are greatly increased as the communication system develops. Some of these constraints arise because of the level of communication technology at the time the constraint is created, and there are some constraints that are unnecessary as communication technology develops, and constraints of existing and new technologies for the same purpose It may be present at the same time. As the constraints become so large, the constraints introduced for the development of the communication system are making the wireless resources of the CC ineffective. Therefore, the introduction of NCT CC, which can be constructed according to the simplified constraints rather than the existing constraints, is free from the constraints that are unnecessary according to the development of the communication technology. Since the NCT CC is not constructed according to the constraints of the existing system, it can not be recognized by the UE implemented according to the existing system. Hereinafter, UEs which are implemented according to the existing system and can not support NCT CC are called legacy UEs, and UEs implemented to support NCT CCs are called NCT UEs.

It is considered that NCT CC will be used as SCC in LTE-A system in the future. Since the NCT CC does not consider use by the legacy UE, the legacy UE does not need to perform cell search, cell selection, cell reselection, etc. in the NCT CC. If the NCT CC is not used as a PCC and the NCT CC is used only as an SCC, unnecessary constraints on the SCC can be reduced compared to an existing LCT CC that can be used as a PCC, enabling more efficient use of the CC. However, the time / frequency synchronization of the NCT CC may not coincide with the synchronization of the PCC. Even if the time / frequency synchronization of the NCT CC is obtained once, the time / frequency synchronization may be changed according to the change of the communication environment. An RS in which time synchronization and / or frequency synchronization can be used for tracking is required. An RS is also needed to allow the UE to detect the NCT CC in the neighbor cell search process. CRS can be used for purposes such as time / frequency synchronization of NCT CC and neighbor cell search using NCT CC. The CRS may be configured in the NCT CC in the same manner as in the existing LTE / LTE-A system shown in FIG. 6 and may have a smaller density in the time axis or frequency axis than the existing LTE / LTE- It may be configured in the NCT CC.

In the present invention, it is proposed that the CRS on the NCT CC is configured to have a lower density on the time axis than the CRS on the LCT CC of the existing LTE / LTE-A system. Accordingly, in the present invention, the NCT CC includes a constraint condition that the CRS is configured in the corresponding CC for every DL subframe, a constraint condition that the CRS is configured in the CC for each antenna port of the eNB, a predetermined number of OFDM It may not satisfy at least one of the constraint conditions that the symbol should be reserved for transmission of the control channel such as the PDCCH over the frequency band of the corresponding CC. For example, on the NCT CC, a CRS may be configured for every predetermined number (> 1) of subframes, not every subframe. Or, on the NCT CC, only the CRS for one antenna port (e.g., antenna port 0) can be configured regardless of the number of antenna ports of the eNB. The CRS of the present invention may not be used for data demodulation unlike the existing CRS shown in FIG. Therefore, instead of the existing CRS used for channel state measurement and demodulation, a tracking RS is newly defined for tracking of time synchronization and / or frequency synchronization, and the tracking RS is added to some subframes and / or some frequency resources on the NCT CC Lt; / RTI > Alternatively, the PDSCH may be configured in the leading OFDM symbols on the NCT CC, the PDCCH may be configured in the existing PDSCH region other than the initial OFDM symbols, or the PDCCH may be configured using some frequency resources. Hereinafter, unlike the existing LTE / LTE-A system, unlike the existing LTE / LTE-A system, the RSs transmitted in some subframes can be used in common by any UE regardless of the name, such as time synchronization and / or frequency synchronization of the NCT CC, RS (common RS, CRS).

10 is a diagram showing an example in which a cross carrier scheduling technique is applied. In particular, in FIG. 10, the number of allocated cells (or component carriers or component carriers) is three and the cross carrier scheduling technique is performed using CIF as described above. Here, it is assumed that the downlink cell # 0 is a downlink main component carrier (i.e., a primary cell, PCell) and the remaining component carriers # 1 and # 2 are subsidiary components (i.e., a secondary cell, SCell).

In the present invention, an effective management method of uplink resources for a main component carrier (primary component carrier, primary cell or PCell) or a subsidiary component carrier (secondary component carrier or secondary cell or SCell) during a carrier aggregation operation I suggest. Hereinafter, the case where the terminal operates by merging two component carriers is explained, but it is obvious that the present invention can also be applied to the case of merging three or more component carriers.

11 is a diagram illustrating a deployment scenario of a UE and a BS in an LTE and LAA service environment.

In the frequency band targeted by the LAA service environment, the wireless communication distance is not long due to the high frequency characteristics. In consideration of this, the deployment scenario between the terminal and the base station in the environment where the existing LTE-licensed service and the LAA service coexist is the overlay model shown on the left side of FIG. 11 and the overlay model shown in the right side of FIG. or a co-located model.

In the case of the overlay model shown in the left side of FIG. 11, the macro eNB performs wireless communication with the X terminal and the X 'terminal in the macro area 32 using a licensed carrier, and a plurality of RRHs and an X2 interface Lt; / RTI > Each RRH may perform wireless communication with an X terminal or an X 'terminal in a certain area 31 using an unlicensed carrier. In this case, there is no mutual interference between the macro eNB and the RRH. However, in order to use the LAA service as an auxiliary downlink channel of the LTE-licensed service through carrier aggregation, an X2 interface between the macro eNB and the RRH A fast data exchange should be made.

In the case of the co-located model shown on the right-hand side of FIG. 11, the pico / femto eNB can perform wireless communication with the Y terminal simultaneously using an authorized carrier and an unauthorized carrier. However, the use of the LTE service and the LAA service together is considered in the downlink data transmission. In this case, coverage for LTE service and coverage for LAA service may differ depending on frequency band, transmission power, and the like.

A terminal according to an embodiment of the present invention can be implemented by various types of wireless communication devices or computing devices that are guaranteed to be portable and mobility.

The base station according to the embodiment of the present invention controls and manages a cell (for example, a macro cell, a femtocell, a picocell, etc.) corresponding to a service area and transmits a signal, channel designation, channel monitoring, Can be performed.

12 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention.

As shown, a terminal 100 according to an embodiment of the present invention may include a processor 110, a communication module 120, a memory 130, a user interface unit 140, and a display unit 150 have.

First, the processor 110 may execute various commands or programs, and may process data inside the terminal 100. [ In addition, the processor 100 can control the entire operation including each unit of the terminal 100, and can control data transmission / reception between the units.

Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards such as the cellular communication interface cards 121 and 122 and the wireless LAN interface card 123, either internally or externally. 12, the communication module 120 is shown as an integrated integrated module, but each network interface card may be independently arranged according to the circuit configuration or use, unlike in FIG.

The cellular communication interface card 121 according to the first frequency band transmits and receives a radio signal with at least one of the base station 200, the external device, and the server using the mobile communication network, Band cellular communication service. Here, the wireless signal may include various types of data or information such as a voice call signal, a video call signal, or a text / multimedia message.

According to an embodiment of the present invention, the cellular communication interface card 121 by the first frequency band may include at least one NIC module using the LTE-Licensed frequency band. According to an embodiment of the present invention, at least one NIC module performs cellular communication with at least one of the base station 200, the external device, and the server independently in accordance with the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module . The cellular communication interface card 121 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

The cellular communication interface card 122 in the second frequency band transmits and receives a radio signal to and from a base station 200, an external device, and a server using a mobile communication network, Band cellular communication service. According to an embodiment of the present invention, the cellular communication interface card 122 by the second frequency band may include at least one NIC module using the LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band may be a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module performs cellular communication with at least one of the base station 200, the external device, and the server independently in accordance with the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module . The cellular communication interface card 122 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

The wireless LAN interface card 123 according to the second frequency band transmits and receives a radio signal to at least one of the base station 200, the external device, and the server through the wireless LAN connection, Band wireless LAN service. According to an embodiment of the present invention, the wireless LAN interface card 123 according to the second frequency band may include at least one NIC module using the wireless LAN frequency band. For example, the WLAN frequency band may be an unlicensed radio band such as a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module performs wireless communication with at least one of the base station 200, the external device, and the server independently in accordance with a wireless LAN standard or protocol of a frequency band supported by the corresponding NIC module . The wireless LAN interface card 123 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

According to an embodiment of the present invention, the processor 110 transmits information on whether or not the wireless LAN communication service of the second frequency band is available through the cellular communication channel of the first frequency band with the base station 200, Information on the period of time. Here, the information on the predetermined period is information set for receiving the downlink data from the base station 200 through the cellular communication channel of the second frequency band.

In addition, according to an embodiment of the present invention, since the base station 200 supports a wireless LAN communication service, the processor 110 can receive a predetermined signal from the base station 200 through a wireless LAN communication channel of a second frequency band And receives the base station coexistence message including information on the period.

In addition, according to an embodiment of the present invention, the processor 110 may be configured to transmit, in response to the received base station coexistence message, The terminal transmits a terminal coexistence message including information on a predetermined period according to a standard or protocol specified in the wireless LAN communication service of the second frequency band.

Also, according to an embodiment of the present invention, the processor 110 receives downlink data from the base station 200 for a predetermined period through a cellular communication channel of a second frequency band.

Next, the memory 130 stores a control program used in the terminal 100 and various data corresponding thereto. The control program may include a predetermined program required for the terminal 100 to perform wireless communication with at least one of the base station 200, the external device, and the server.

Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. In addition, the user interface 140 may perform output based on instructions of the processor 110 using various output means.

Next, the display unit 150 outputs various images on the display screen. The display unit 150 may output various display objects such as a content executed by the processor 110 or a user interface based on a control command of the processor 110. [

12, the base station 200 according to an exemplary embodiment of the present invention may include a processor 210, a communication module 220, and a memory 230. In addition,

First, the processor 210 may execute various commands or programs and may process data within the base station 200. In addition, the processor 210 can control the entire operation including each unit of the base station 200, and can control data transmission / reception between the units.

Next, the communication module 220 may be an integrated module for performing mobile communication using a mobile communication network and wireless LAN connection using a wireless LAN, such as the communication module 120 of the terminal 100 described above. To this end, the communication module 120 may include a plurality of network interface cards, such as the cellular communication interface cards 221 and 222 and the wireless LAN interface card 223, either internally or externally. 12, the communication module 220 is shown as an integrated integration module, but each network interface card may be independently arranged according to the circuit configuration or use, unlike in FIG.

The cellular communication interface card 221 according to the first frequency band transmits and receives a radio signal to at least one of the terminal 100, the external device, and the server using the mobile communication network, And provides cellular communication service by one frequency band. Here, the wireless signal may include various types of data or information such as a voice call signal, a video call signal, or a text / multimedia message.

According to an embodiment of the present invention, the cellular communication interface card 221 by the first frequency band may include at least one NIC module using the LTE-Licensed frequency band. According to an embodiment of the present invention, the at least one NIC module can perform cellular communication with at least one of the terminal 100, the external device, and the server independently according to the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module. Can be performed. The cellular communication interface card 221 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200.

The cellular communication interface card 222 according to the second frequency band transmits and receives a radio signal to at least one of the terminal 100, the external device, and the server using the mobile communication network, And provides a cellular communication service by two frequency bands. According to an embodiment of the present invention, the cellular communication interface card 222 by the second frequency band may include at least one NIC module using the LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band may be a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, the at least one NIC module can perform cellular communication with at least one of the terminal 100, the external device, and the server independently according to the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module. Can be performed. The cellular communication interface card 222 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200. [

The wireless LAN interface card 223 according to the second frequency band transmits and receives a wireless signal to at least one of the terminal 100, the external device, and the server through the wireless LAN connection, 2 frequency band. According to an embodiment of the present invention, the wireless LAN interface card 223 according to the second frequency band may include at least one NIC module using the wireless LAN frequency band. For example, the WLAN frequency band may be an unlicensed radio band such as a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module independently communicates with at least one of the terminal 100, the external device, and the server in accordance with a wireless LAN standard or protocol of a frequency band supported by the corresponding NIC module Can be performed. The wireless LAN interface card 223 can operate only one NIC module at a time or operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200. [

According to an embodiment of the present invention, the processor 210 transmits information on whether or not the wireless LAN communication service of the second frequency band is available through the cellular communication channel of the first frequency band with the terminal 100, Information on the period of time. Here, the information on the predetermined period is information set for transmitting the downlink data to the terminal 100 through the cellular communication channel of the second frequency band.

In addition, according to an embodiment of the present invention, the processor 210 may be a peripheral terminal capable of communicating with the base station 200 through the terminal 100 and the wireless LAN communication service of the second frequency band, And transmits the base station coexistence message including information on a predetermined period according to a standard or protocol defined in the wireless LAN communication service to the terminal 100 for a predetermined period on the cellular communication channel of the second frequency band, .

In addition, according to an embodiment of the present invention, since the terminal 100 supports the wireless LAN communication service, the processor 210 transmits the base station coexistence message Lt; RTI ID = 0.0 > coexistence < / RTI > Here, the terminal coexistence message includes information on a predetermined period.

The terminal 100 and the base station 200 shown in FIG. 12 are block diagrams according to an embodiment of the present invention. Blocks that are separately displayed are logically distinguished from elements of a device. Thus, the elements of the device described above can be mounted as one chip or as a plurality of chips depending on the design of the device. In addition, in the embodiment of the present invention, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be optionally provided in the terminal 100. In addition, in the embodiment of the present invention, the user interface 140, the display unit 150, and the like may be additionally provided to the base station 200 as needed.

Referring to FIG. 13, a BS may configure a suitable transmission scheme for a UE, and the UE may transmit different HARQ-ACK bits according to each transmission scheme set by the BS to an uplink control channel (e.g., PUCCH) Data channel (e.g., PUSCH). For example, the BS can schedule 1 TB (Transport block) or 2 TBs on the downlink control channel (PDCCH) for scheduling the PDSCH to the UE. If only one TB is scheduled, the UE shall feed back the 1-bit HARQ-ACK bit of the corresponding TB. When scheduling 2 TBs, the UE must feed back 2bits HARQ-ACK bits of each of two TBs. There may be a predetermined order between 2bits HARQ-ACK bits and 2TBs so that there is no misunderstanding between the BS and the UE. For reference, transmit 1 TB when multiple-input multiple-output (MIMO) transmission rank or layer is small, and 2 TBs when MIMO transmission rank or layer is high.

The component carriers described in the present invention may also be used with the term cell. In the present invention, the carrier merging is mainly described for convenience of description. However, in the case of a system using the TDD scheme using carrier merging, the component carriers correspond to all the component carriers of the subframe (or slot) to be HARQ-ACK multiplexed .

When the terminal uses the carrier merging in which a plurality of carriers are merged and transmitted, each component carrier may be configured with a different transmission scheme. That is, the component carrier # 0 may be configured to transmit 1 TB, and the component carrier # 1 may be configured to transmit 2 TBs. In a case where one of self-carrier scheduling and cross-carrier scheduling is configured in the UE, the UE monitors the corresponding carrier for the PDCCH to monitor the PDCCH according to the mode set for the UE, decodes the PDCCH, The HARQ-ACK for the TBs transmitted through the PDSCH in the carrier must be collected and transmitted on the PUCCH (or PUSCH). However, the UE may fail to decode the PDCCH scheduled for some component carriers of the component carriers configured by the base station (this is called a DTX (discontinuous transmission)), decode the remaining components except HARQ-ACK (s) Only the HARQ-ACK (s) of the succeeding component carrier can be collected and transmitted on the PUCCH (or PUSCH). In this case, a misunderstanding may occur in the HARQ-ACK feedback analysis between the BS and the MS. In order to solve this problem, LTE-A Rel.13 adopts DTX detection method according to DAI (donwlink assignment index). The PDCCH for scheduling each PDSCH includes a counter-DAI and a total-DAI. Counter-DAI indicates the number of PDSCHs scheduled from component carrier # 0 to the current component carrier. Total-DAI indicates the number of PDSCHs scheduled for all component carriers. The UE can know that the PDSCH scheduled by the PDCCH is the PDSCH transmitted, and can transmit the HARQ-ACK in the corresponding order by succeeding in decoding the PDCCH. 14, when the PDSCH is transmitted from the base station to the component carriers # 0, # 1, # 3, # 4, # 5, and # 7 to the terminal that can use up to eight component carriers, The counter-DAI, total-DAI value of the component carrier # 1 is (0,5), the value of the counter-DAI of the component carrier # 1 is (1,5) DAI, total-DAI) value is (2,5), the value of counter-DAI of component carrier # 4 is (3,5), and the counter-DAI, total- DAI) value is (4,5), and the (counter-DAI, total-DAI) value of component carrier # 1 is (5,5). When the UE fails to decode the PDCCH corresponding to the component carrier # 3, it can be noticed that one PDSCH has failed to receive through the counter-DAI value of the PDCCH corresponding to the component carrier # 4. When the UE fails to decode the PDCCH corresponding to the component carrier # 7, one PDSCH is scheduled after the component carrier # 5 through the counter-DAI value and the total-DAI value of the PDCCH corresponding to the component carrier # 5, It can be seen that it was not successful.

It is possible to know the order of PDSCHs that have successfully received through the DAI scheme and the order of PDSCHs that failed to receive. However, the HARQ-ACK bit sequence can not be determined because the number of TBs included in the failed PDSCH can not be determined. Therefore, LTE uses two methods. The first way is to apply spatial bundling to all PDSCHs. In other words, this scheme is to bundle a 2-bit HARQ-ACK for the PDSCH that transmits 2TB into 1bit. Therefore, it is possible to determine the HARQ-ACK bit sequence even if there is a failed PDSCH. This scheme has no additional UCI overhead, but it can degrade transmission performance. The second scheme assumes that all PDSCHs contain two TBs without using spatial bundling. In other words, this scheme transmits a 2-bit HARQ-ACK instead of 1-bit HARQ-ACK for the PDSCH that transmits 1 TB. Therefore, the HARQ-ACK bit sequence can be determined even if PDSCH fails to receive. This approach can cause additional UCI overhead.

Referring to FIG. 13, the 3GPP NR (new radio) supports a CBG (code block group) based transmission in addition to the TB based transmission.

The TB-based transmission scheme is as follows. The UE may transmit a 1-bit HARQ-ACK per TB in order to transmit the success or failure of each TB to the BS. In order to generate an HARQ-ACK corresponding to one TB, the UE can confirm whether or not the TB is erroneous through the TB-CRC. If the TB-CRC is successfully checked, the corresponding TB can be determined as ACK, otherwise it can be determined as NACK. The base station must retransmit the TB, which is a NACK, of the HARQ-ACKs received from the UE.

The CBG-based transmission scheme is as follows. The UE can transmit a 1-bit HARQ-ACK per CBG in order to transmit the success of each CBG to the BS. In order to generate HARQ-ACK corresponding to one CBG, the UE decodes all the CBs included in the CBG and confirms the error through the CB-CRC. When all the CBs constituting one CBG have no error (when the CB-CRC is successfully checked), it can be determined as ACK. If one of the CBs constituting one CBG has an error, it is determined as NACK . The base station must retransmit the CBs included in the CBG, which is the NACK of the HARQ-ACK received from the UE. When retransmitting, it can be transmitted in the same manner as existing CBG configuration. For reference, the length of the HARQ-ACK bit transmitted from the UE to the BS may be the maximum number of CBGs configured by the BS or the number of CBGs included in the PDSCH. In addition, a 1-bit TB-based HARQ-ACK can be additionally transmitted in addition to the CBG-based HARQ-ACK. The TB-based HARQ-ACK can indicate whether the TB-CRC has been successfully checked.

When the UE is configured to multiplex and transmit HARQ-ACK bits for a plurality of component carriers, the base station can configure whether CBG-based transmission is possible for each component carrier. In addition, a PDCCH for TB-based transmission may be transmitted to a component carrier constituting CBG-based transmission. That is, the terminal expects only TB-based transmission for some component carriers and expects both TB-based and CBG-based transmissions for other component carriers. Accordingly, the UE must successfully receive all the PDCCHs scheduled for each component carrier, so that the HARQ-ACK bit sequence to be transmitted in the uplink can be known. In order to prevent misinterpretation and interpretation of the HARQ-ACK bit sequence between the Node B and the UE, an LTE Rel. 13 DAI scheme can be reused. Counter-DAI indicates the cumulative number of PDSCHs scheduled from component carrier # 0 to the current PDCCH, and total-DAI indicates the total number of PDSCHs scheduled for all component carriers. Assume that CBG-based transmission requires N HARQ-ACK bits transmission. The UE and the base station can use three methods to prevent the misunderstanding of the HARQ-ACK bit sequence that may occur when the PDCCH decoding fails. The first scheme assumes that all the PDSCHs scheduled to the UE perform CBG-based transmission when the base station constructs the CBG-based transmission together with the CA configuration. That is, even if the BS configures the CBG-based transmission to the MS, the BS transmits the N-bit HARQ-ACK even if the BS performs the TB-based transmission in which 1 bit or 2 bits HARQ-ACK transmission is expected. The second scheme assumes that all the PDSCHs scheduled to the UE perform TB-based transmission when the base station constructs the CBG-based transmission together with the CA configuration. Therefore, it can be fixed to transmit up to 1 bit or 2 bits HARQ-ACK in the manner used in LTE Rel-13. In the third method, when the base station configures the CA to configure whether CBG-based transmission is possible for each component carrier in the configuration of the CA, for the PDSCH scheduled to the UE, the PDSCH according to whether each component carrier is composed of CBG- It is assumed that the transmission is a CBG-based transmission or a TB-based transmission. In other words, when a base station constructs a CBG-based transmission on a specific component carrier (s), even if a base station performs TB-based transmission in which a 1-bit or 2-bit HARQ- bit HARQ-ACK, and if the base station does not configure the CBG-based transmission in the specific component carrier (s) to the UE, the UE determines the TB-based transmission, (E.g., up to 1 bit or 2 bits HARQ-ACK per TB at the base station (s)). Where N is the maximum number of CBGs per TB in a CBG-based transmission configuration on that particular component carrier.

However, the first scheme is disadvantageous in that the overhead of the uplink control channel (for example, PUCCH) is excessively large. For example, if N = 4, a 1-bit HARQ-ACK increases to 4 bits, resulting in a maximum of 400% overhead. The second scheme is to use the HARQ-ACK feedback information according to each CBG from the UE according to the CBG-based transmission during the carrier merging, even though the UE configures the CBG-based transmission from the base station and the CBG- There is no gain in the performance of the CBG-based transmission.

The problem to be solved by the present invention is to prevent misinterpretation of the HARQ-ACK bit sequence between the Node B and the UE when the UE using the HARQ-ACK multiplexing is composed of the TB-based transmission and the CBG-based transmission, Signaling scheme.

In order to solve the above problem, it is assumed that when the PDSCH is transmitted based on the CBG, the HARQ-ACK feedback for the PDSCH is always transmitted in N bits. That is, the PDSCH transmitted to the CBG transmits the same N bits of HARQ-ACK feedback irrespective of the number of CBGs transmitted by the actual PDSCH. Here, the N value may be the maximum number of CBGs that the BS has configured for the UE. As another example, the value of N may be less than the maximum number of CBGs configured by the base station and may be a value configured by the base station for HARQ-ACK multiplexing.

In order to solve the above problem, when the UE receives the PDCCH, the UE can recognize whether the PDSCH scheduled by the PDCCH is a TB-based transmission or a CBG-based transmission. TB-based transmission or CBG-based transmission can be signaled with explicit 1-bit to the downlink control information (e.g., DCI (downlink control information)) scheduling the PDSCH, or a combination of other values included in the downlink control information . In addition, TB-based transmission and CBG-based transmission can be distinguished by using different downlink control information format. Here, different downlink control information format may include information whose size is different from that of the downlink control information, or that a CRC (cyclic redundancy code) is scrambled with a different RNTI (Radio Network Temporary Identifier). Also, when the UE receives the PDCCH for scheduling the PDSCH to be transmitted based on the CBG, the UE can know which CBG among all the CBGs the PDSCH includes. This can be explicitly transmitted to the downlink control information.

For ease of description of the present invention, the order is incremented from 0 to 1.

When the PDSCH is transmitted based on the CBG, when the HARQ-ACK feedback for the PDSCH is always fixed to N bits, in the first preferred embodiment of the present invention, the BS generates a separate counter DAI and total DAI Value and a counter-DAI value and a total-DAI value corresponding to the transmission scheme to the counter-DAI field and the total-DAI field of the PDCCH for scheduling the PDSCH of each transmission scheme, the counter-DAI field and the total-DAI field can be interpreted as counter-DAI and total-DAI values of the transmission scheme scheduled by the PDCCH. More specifically, referring to Table 3, a counter-DAI value and a total-DAI value for the TB-based transmission are mapped in the counter-DAI field and the total-DAI field of the PDCCH for scheduling PDSCH for TB- The counter-DAI value indicates the number of PDSCHs that are TB-based transmissions (i.e., the C-th PDSCH if the counter-DAI value is C) from component carrier # 0 to before the current component carrier, (I.e., if the total-DAI value is T, T + 1 PDSCHs are scheduled). More specifically, the counter-DAI field and the total-DAI field of the PDCCH for scheduling the PDSCH for CBG-based transmission are mapped to the counter-DAI value and the total-DAI value for CBG-based transmission, It notifies the number of PDSCHs that are CBG-based transmissions from component carrier # 0 to the current component carrier, and its total-DAI value can inform the number of PDSCHs that are CBG-based transmissions allocated to all component carriers.

Detected PDCCH UE's Interpretation When counter-DAI field is mapped to C When the total-DAI field is mapped to T PDCCH scheduling TB-based transmission # of scheduled TB-based transmission from CC # 0 to previous CC is C # of scheduled TB-based transmission in all CC is T + 1 PDCCH scheduling CBG-based transmission # of scheduled CBG-based transmission from CC # 0 to previous CC is C # of scheduled CBG-based transmission in all CC is T + 1

15, when the PDSCH is transmitted from the component carriers # 0, # 1, # 3, # 4, # 5 and # 7 to the UE, the PDSCH is transmitted to the component carriers # 0, # 3, # 5, PDSCH is a CBG-based transmission, and the PDSCH transmitted to component carriers # 1 and # 4 is a TB-based transmission. (Counter-DAI, total-DAI) value of the PDCCH corresponding to the CBG-based transmission component carrier # 0 is (0, 3) -DAI) value is (1, 3), and the (counter-DAI, total-DAI) value of the PDCCH corresponding to the CBG-based transmission component carrier # 5 is (2,3) 7, the (counter-DAI, total-DAI) value of the PDCCH is (3, 3). (Counter-DAI, total-DAI) value of the PDCCH corresponding to the component carrier # 1 which is the TB-based transmission is (0, 1) -DAI) value is (1,1).

When receiving the PDCCH, the UE interprets a value mapped to the counter-DAI field and the total-DAI field as a counter-DAI value and a total-DAI value for the PDSCH transmission scheme scheduled by the PDCCH. For example, if a PDCCH for scheduling a PDSCH of the component carrier # 3 is successfully received, the UE can know whether the PDSCH is a CBG-based transmission or not, and a value mapped to the counter-DAI field and the total- It is known that the value corresponds to the transmission. That is, if (1, 3), four CBG-based transmissions are allocated and it is known that the second PDSCH transmission is performed.

If the order of the counter-DAI values to inform in the CBG-based transmission is not appropriate (for example, in the order of 0-> 1-> 2-> 3 ...), the UE may perform decoding of the PDCCH scheduling some CBG- It can be determined that the failure has occurred. If the counter-DAI value indicating the last successful PDCCH-received CBG-based transmission is not equal to the total-DAI value, the UE fails to decode the PDCCH that schedules the CBG-based transmission after the last successful CBG-based transmission . In this case, the number of CBG-based transmissions that failed to receive the PDCCH after the last CBG-based transmission of the PDCCH can be known by the difference between the total-DAI value and the counter-DAI value.

In addition, if the order of the counter-DAI values informed in the TB-based transmission is not appropriate (for example, if the order is 0-> 1-> 2-> 3 ...), the UE transmits a PDCCH It can be determined that the decoding of " The UE fails to decode the PDCCH that schedules the TB-based transmission after the last TB-based transmission of the PDCCH if the counter-DAI value indicating the last successful PDCCH reception is not equal to the total-DAI value . In this case, the number of TB-based transmissions that failed to receive the PDCCH after the last TB-based transmission of the PDCCH can be determined by the difference between the total-DAI value and the counter-DAI value.

For example, if the CBG transmission fails to decode the PDCCH corresponding to the scheduled component carriers # 3 and # 7 and the CBG transmission succeeds in decoding the scheduled PDCCH corresponding to the remaining component carriers # 0 and # 5, the counter You can get a value of 0,2 for the -DAI value. Therefore, the UE can know that the PDCCH corresponding to counter-DAI = 1 has failed to be received. In addition, since the counter-DAI value of the CBG-based transmission that has succeeded in receiving the PDCCH is 2, the counter-DAI value of the total-DAI after the CBG based transmission succeeding the reception of the PDCCH last is 2, It can be seen that it failed.

이다. Referring to FIG. 16, the UE can configure the HARQ-ACK bit sequence as follows. First, the UE can collect N-bit HARQ-ACKs for CBG-based transmission in the order of the counter-DAI value of the CBG-based transmission. At this time, N 'NACK' can be used as N-bit HARQ-ACK for the PDSCH that failed PDCCH reception. The UE can collect 1 or 2 bits HARQ-ACKs for TB-based transmission in the order of the counter-DAI value of the TB-based transmission. At this time, one or two 'NACK' can be used as 1-bit or 2-bits HARQ-ACK as HARQ-ACK for the PDSCH that failed PDCCH reception. For reference, a 1 or 2 bits HARQ-ACK decision for TB-based transmission can be determined to be 1 bit using spatial bundling or 2 bits otherwise. For reference, if the UE does not receive any PDCCH to schedule CBG-based transmission, there may be no HARQ-ACK bit for CBG-based transmission. Also, if the UE does not receive any PDCCHs scheduling TB-based transmission, there may be no HARQ-ACK bits for TB-based transmission. The UE can construct an entire HARQ-ACK bit sequence by sequentially connecting the HARQ-ACK bit sequence for each CBG-based transmission and the HARQ-ACK bit sequence for TB-based transmission. For example, a HARQ-ACK bit sequence can be constructed by connecting a HARQ-ACK bit sequence for CBG-based transmission followed by a HARQ-ACK bit sequence for TB-based transmission. As another example, a HARQ-ACK bit sequence can be constructed by concatenating a HARQ-ACK bit sequence for TB-based transmission and a HARQ-ACK bit sequence for CBG-based transmission. Referring to FIG. 16, the HARQ-ACK bit sequence constructed by the UE

to be.

In order to obtain a counter-DAI value and a total-DAI value corresponding to a transmission base of the UE, the first embodiment described above uses a PDCCH for scheduling at least one CBG-based transmission and a PDCCH for scheduling a TB- Should receive. If only the PDCCH for one transmission scheme is received, it is impossible to know whether or not scheduling is performed for the other transmission scheme. For example, when one PDCCH scheduling a TB-based transmission is scheduled, if the UE fails to decode the PDCCH, the UE can not know whether the PDCCH for the TB-based transmission is transmitted, and thus generates HARQ-ACK of the TB- And a misunderstanding of the HARQ-ACK bit sequence between the BS and the MS may occur.

PDSCH is transmitted on a CBG basis. In a second preferred embodiment of the present invention, when the HARQ-ACK feedback for the PDSCH is always fixed to N bits, the BS generates separate independent counter-DAIs and total- DAI field corresponding to the transmission scheme is transmitted to the counter-DAI field of the PDCCH for scheduling the PDSCH of each transmission scheme, and the counter-DAI value corresponding to the total- The DAI value or the total-DAI value of the CBG-based transmission can be transmitted. The UE can interpret the value of the counter-DAI field mapped to the PDCCH as a counter-DAI value of the transmission scheme scheduled by the PDCCH, and the value mapped to the total-DAI field according to the counter- And a total-DAI value for CBG-based transmission. Preferably, if the counter-DAI value is an even number, it is determined that the value mapped to the total-DAI field is the total-DAI value of the PDSCH transmission scheme scheduled by the PDCCH. Otherwise, it is determined that the value is the total- can do. More specifically, referring to Table 4, a counter-DAI value for TB-based transmission is mapped to a counter-DAI field of a PDCCH for scheduling PDSCH for TB-based transmission, and its counter- To the number of PDSCHs that are TB-based transmissions before the current component carrier. If the value of the counter-DAI field of the PDCCH scheduling the PDSCH for TB-based transmission is even, the total-DAI value for the TB-based transmission is mapped to the total-DAI field, and the PDCCH for scheduling the PDSCH for the TB- The total-DAI field is mapped to the total-DAI value for the CBG-based transmission. The counter-DAI field for CBG-based transmission is mapped to the counter-DAI field of the PDCCH for scheduling the PDSCH for CBG-based transmission. The counter-DAI value is mapped to the CBG- PDSCH < / RTI > If the value of the counter-DAI field of the PDCCH for scheduling the PDSCH for CBG-based transmission is even, the total-DAI value for CBG-based transmission is mapped to the total-DAI field and the PDCCH for scheduling the PDSCH for CBG- The total-DAI field is mapped to the total-DAI value for the TB-based transmission. The total-DAI value for TB-based transmission is the number of PDSCHs, which are TB-based transmissions allocated to all component carriers, minus one, and the total-DAI value for CBG-based transmission is the CBG- 1 " by the number of transmission PDSCHs.

Detected PDCCH UE's Interpretation When counter-DAI field is mapped to C When the total-DAI field is mapped to T PDCCH scheduling TB-based transmission # of scheduled TB-based transmission from CC # 0 to previous CC is C If C is an even number,
# of scheduled TB-based transmission in all CC is T + 1
Otherwise, # of scheduled CBG-based transmission in all CC is T + 1 PDCCH scheduling CBG-based transmission # of scheduled CBG-based transmission from CC # 0 to previous CC is C If C is an even number,
# of scheduled CBG-based transmission in all CC is T + 1
Otherwise, # of scheduled TB-based transmission in all CC is T + 1

17, when the PDSCH is transmitted to the UEs on the component carriers # 0, # 1, # 3, # 4, # 5 and # 7, the PDSCH is transmitted to the component carriers # 0, # 3, # 5, PDSCH is a CBG-based transmission, and the PDSCH transmitted to component carriers # 1 and # 4 is a TB-based transmission. (Counter-DAI, total-DAI) value of the PDCCH corresponding to the CBG-based transmission component carrier # 0 is (0, 3) (DA1) value of the PDCCH corresponding to the CBG-based transmission component carrier # 5 is (2, 3), and the CBG-based transmission component carrier # 7, the (counter-DAI, total-DAI) value of the PDCCH is (3, 1). (Counter-DAI, total-DAI) value of the PDCCH corresponding to the component carrier # 1 which is the TB-based transmission is (0, 1) -DAI) value is (1,3).

When the UE receives the PDCCH, the UE interprets the value mapped to the counter-DAI field as a counter-DAI value for the PDSCH transmission scheme scheduled by the PDCCH. If the counter-DAI value is an even number, Is interpreted as a total-DAI value for the transmission scheme of the PDSCH scheduled by the PDCCH. Otherwise, it can be interpreted as the total-DAI value for the other transmission scheme. For example, if a PDCCH for scheduling a PDSCH of the component carrier # 3 is successfully received, the UE can know whether the PDSCH is a CBG-based transmission or not, and compare the value mapped to the counter-DAI field with a value And the value mapped to the total-DAI field is the total-DAI value corresponding to the TB-based transmission since the counter-DAI value is odd. That is, if (1, 1), it is the second PDSCH transmission based on CBG, and it can be seen that two TB-based transmissions are scheduled.

If the order of the counter-DAI values informed in the CBG-based transmission is not appropriate (for example, if the order is 0-> 1-> 2-> 3-> 0 ...), the UE transmits a PDCCH It can be determined that the decoding of " If the counter-DAI value indicating the last successful PDCCH-received CBG-based transmission is not equal to the total-DAI value, the UE fails to decode the PDCCH that schedules the CBG-based transmission after the last successful CBG-based transmission . In this case, the number of CBG-based transmissions that failed to receive the PDCCH after the last CBG-based transmission of the PDCCH can be known by the difference between the total-DAI value and the counter-DAI value.

In addition, if the order of the counter-DAI values informed by the TB-based transmission is not appropriate (for example, 0-> 1-> 2-> 3-> 0 ...) It can be determined that decoding of the PDCCH to be scheduled fails. The UE fails to decode the PDCCH that schedules the TB-based transmission after the last TB-based transmission of the PDCCH if the counter-DAI value indicating the last successful PDCCH reception is not equal to the total-DAI value . In this case, the number of TB-based transmissions that failed to receive the PDCCH after the last TB-based transmission of the PDCCH can be determined by the difference between the total-DAI value and the counter-DAI value.

For example, if the CBG transmission fails to decode the PDCCH corresponding to the scheduled component carriers # 3 and # 7 and the CBG transmission succeeds in decoding the scheduled PDCCH corresponding to the remaining component carriers # 0 and # 5, the counter You can get a value of 0,2 for the -DAI value. Therefore, it can be seen that the UE fails to receive the PDCCH to which the counter-DAI = 1 is mapped. In addition, since the counter-DAI value of the CBG-based transmission is 2, the total-DAI value corresponding to the CBG transmission is 3. However, since the CBG- It can be seen that the CBG-based transmission fails.

The UE can configure the HARQ-ACK bit sequence as follows. First, the UE can collect N-bit HARQ-ACKs for CBG-based transmission in the order of the counter-DAI value of the CBG-based transmission. At this time, N 'NACK' can be used as N-bit HARQ-ACK for the PDSCH that failed PDCCH reception. The UE can collect 1 or 2 bits HARQ-ACKs for TB-based transmission in the order of the counter-DAI value of the TB-based transmission. At this time, one or two 'NACK' may be used as 1 or 2 bits HARQ-ACK for the PDSCH that failed PDCCH reception. For reference, a 1 or 2 bits HARQ-ACK decision for TB-based transmission can be determined to be 1 bit using spatial bundling or 2 bits otherwise. The UE can construct an entire HARQ-ACK bit sequence by sequentially connecting the HARQ-ACK bit sequence for each CBG-based transmission and the HARQ-ACK bit sequence for TB-based transmission. For example, a HARQ-ACK bit sequence can be constructed by connecting a HARQ-ACK bit sequence for CBG-based transmission followed by a HARQ-ACK bit sequence for TB-based transmission. As another example, a HARQ-ACK bit sequence can be constructed by concatenating a HARQ-ACK bit sequence for TB-based transmission and a HARQ-ACK bit sequence for CBG-based transmission.

The second embodiment described above can know the number of PDSCHs scheduled in different transmission schemes by receiving one transmission scheme. Accordingly, it is possible to prevent a misunderstanding of the HARQ-ACK bit sequence between the Node B and the UE even if all transmission methods fail. For example, when there is one PDCCH scheduling the TB-based transmission, even if the UE fails to decode one PDCCH, the number of PDSCHs of the TB-based transmission can be known through the PDCCH scheduling the CBG-based transmission, The HARQ-ACK bit sequence can be generated. However, in the above-described second embodiment, a misunderstanding of the HARQ-ACK bit sequence between the BS and the MS may occur in a situation where only one PDCCH is successfully received.

When the PDSCH is transmitted based on the CBG, when the HARQ-ACK feedback for the PDSCH is always fixed to N bits, in the third preferred embodiment of the present invention, the BS allocates an independent counter-DAI and a common total -DAI value and transmits the counter-DAI value corresponding to the transmission method to the counter-DAI field of the PDCCH for scheduling the PDSCH of each transmission method, and transmits a counter-DAI value corresponding to the transmission method regardless of the transmission method, Lt; / RTI > The UE can interpret the value of the counter-DAI field mapped to the PDCCH as a counter-DAI value of the transmission scheme scheduled by the PDCCH and interpret the value of the total-DAI field as the common total-DAI value of all the transmission schemes . More specifically, referring to Table 5, a counter-DAI value for TB-based transmission is mapped to a counter-DAI field of a PDCCH for scheduling PDSCH for TB-based transmission, and its counter- To the number of PDSCHs that are TB-based transmissions before the current component carrier. The counter-DAI field for CBG-based transmission is mapped to the counter-DAI field of the PDCCH for scheduling the PDSCH for CBG-based transmission. The counter-DAI value is mapped to the CBG- PDSCH < / RTI > Regardless of the transmission method, the total-DAI field is mapped to a common total-DAI value of all transmission methods. Preferably, the common total-DAI value can be set to a specific value when only one transmission scheme is scheduled. The particular value may be 4 (binary 11) when using a 2-bit total-DAI value. When using a 3-bit total-DAI value, it can be 4 or 8 (011 or 111 in binary). Preferably, the common total-DAI value may be set to a value obtained by subtracting 1 from the number of PDSCHs of the CBG transmission scheme scheduled for all component carriers when both transmission schemes are scheduled. Preferably, the common total-DAI value may be set to a value that minimizes the HARQ-ACK bit sequence.

Detected PDCCH UE's Interpretation When counter-DAI field is mapped to C When the total-DAI field is mapped to T PDCCH scheduling TB-based transmission # of scheduled TB-based transmission from CC # 0 to previous CC is C # of scheduled TB-based transmission in all CC is T + 1 and # of scheduled CBG-based transmission in all CC is T + 1 PDCCH scheduling CBG-based transmission # of scheduled CBG-based transmission from CC # 0 to previous CC is C # of scheduled TB-based transmission in all CC is T and # of scheduled CBG-based transmission in all CC is T + 1

18, PDSCHs are transmitted to the component carriers # 0, # 3, # 5, and # 7 when the PDSCH is transmitted to the mobile stations # 0, # 1, # 3, # 4, # 5, PDSCH is a CBG-based transmission, and the PDSCH transmitted to component carriers # 1 and # 4 is a TB-based transmission. Assuming that the same total-DAI value is the number of PDSCHs allocated for CBG-based transmission, the (counter-DAI, total-DAI) value of the PDCCH corresponding to the CBG-based transmission of component carrier # 0 is , The (counter-DAI, total-DAI) value of the PDCCH corresponding to the CBG-based transmission component carrier # 3 is (1,3), and the counter-DAI, PDCCH of the PDCCH corresponding to the CBG- the total-DAI) value is (2,3), and the (counter-DAI, total-DAI) value of the PDCCH corresponding to the CBG-based transmission component carrier # 7 is (3,3). (Counter-DAI, total-DAI) value of the PDCCH corresponding to the component carrier # 1 which is the TB-based transmission is (0, 3) -DAI) value is (1,3).

When receiving the PDCCH, the UE interprets the value mapped to the counter-DAI field as a counter-DAI value for the PDSCH transmission scheme scheduled by the PDCCH, and maps the value mapped to the total-DAI field to the total- It can be interpreted as a DAI value. For example, if a PDCCH for scheduling a PDSCH of component carrier # 3 is successfully received, the UE can know whether the PDSCH is a CBG-based transmission or not, and know the counter-DAI value and the total- have. That is, if (1, 3), four TB-based transmission and CBG-based transmission are allocated, and it can be understood that the second CBG-based PDSCH transmission is performed. For reference, the same total-DAI value has the same value irrespective of the transmission mode, but the same number of PDSCHs may not be scheduled. For example, if total-DAI is expressed as 2 bits, the difference between the number of PDSCHs scheduled based on TB and the number of scheduled PDSCHs based on CBG may be a multiple of four.

If the order of the counter-DAI values informed by the CBG-based transmission is not appropriate (for example, 00-> 01-> 10-> 11-> 00 ... order), the UE transmits a PDCCH It can be determined that the decoding of " If the counter-DAI value indicating the last successful PDCCH-received CBG-based transmission is not equal to the total-DAI value, the UE fails to decode the PDCCH that schedules the CBG-based transmission after the last successful CBG-based transmission . In this case, the number of CBG-based transmissions that failed to receive after the last successfully received CBG-based transmission is known as the difference between the total-DAI value and the counter-DAI value. If no PDCCH indicating CBG-based transmission is received and the total-DAI value is a specific value, it can be determined that the CBG-based transmission is not scheduled. If none of the PDCCHs that are CBG-based transmissions are received and the total-DAI value is not a specific value, it can be determined that decoding of the PDCCH, which is a CBG-based transmission, is failed by the total-DAI. Preferably, the specific value may be 11 (when the counter-DAI increases by 1 from 00) when using a 2-bits total-DAI value. When using a 3-bit total-DAI value, it can be 011 or 111 (when counter-DAI increases by 1 from 000).

In addition, if the order of the counter-DAI values reported by the TB-based transmission is not appropriate (for example, 00-> 01-> 10-> 11-> 00 ... order) It can be determined that decoding of the PDCCH to be scheduled fails. The UE fails to decode the PDCCH that schedules the TB-based transmission after the last TB-based transmission of the PDCCH if the counter-DAI value indicating the last successful PDCCH reception is not equal to the total-DAI value . In this case, the number of TB-based transmissions that failed to receive after the last successfully received TB-based transmission can be known by the difference between the total total-DAI value and the counter-DAI value reported in the TB-based transmission. If the counter-DAI value indicating the last successful PDCCH reception in the CBG-based transmission is not equal to the total-DAI value, the UE can decode the PDCCH scheduling CBG-based transmission after the last CBG- It can be determined that it has failed. In this case, the number of CBG-based transmissions that failed to receive after the last successfully received CBG-based transmission can be known by the difference between the last total-DAI value and counter-DAI value reported in the CBG-based transmission.

For example, if the CBG transmission fails to decode the PDCCH corresponding to the scheduled component carriers # 3 and # 7 and the CBG transmission succeeds in decoding the scheduled PDCCH corresponding to the remaining component carriers # 0 and # 5, the counter You can get a value of 0,2 for the -DAI value. Therefore, it can be seen that the UE fails to receive the PDCCH to which the counter-DAI = 1 is mapped. In addition, since the counter-DAI value of the last CBG-based transmission is 2, the CBG-based transmission after the last successfully received CBG-based transmission, which is the difference between the total-DAI value and the counter- It can be seen that the transmission failed.

For example, if the TB transmission succeeds in decoding the PDCCH corresponding to the scheduled component carriers # 1 and # 4, a value of 0,1 can be obtained as a counter-DAI value. Since the counter-DAI value of the last TB-based transmission is 1, the counter-DAI that is the difference of the total-DAI after the last successful TB-based transmission fails to transmit two TB-based transmissions Able to know. For reference, the base station transmits two data in the TB-based transmission, but it is indicated that four data are transmitted in the total-DAI value. For reference, the BS can know that decoding failure of the PDCCH of the last two TB-based transmission occurs.

The UE can configure the HARQ-ACK bit sequence as follows. First, the UE can collect N-bit HARQ-ACKs for CBG-based transmission in a counter-DAI order based on the CBG transmission. At this time, N 'NACK' can be used as N-bit HARQ-ACK for the PDSCH that failed PDCCH reception. The UE can collect 1 or 2 bits HARQ-ACKs for TB-based transmission in the counter-DAI order of the TB-based transmission. At this time, one or two 'NACK' may be used as 1 or 2 bits HARQ-ACK for the PDSCH that failed PDCCH reception. For reference, a 1 or 2 bits HARQ-ACK decision for TB-based transmission can be determined to be 1 bit using spatial bundling or 2 bits otherwise. For reference, if the UE does not receive any PDCCH scheduling CBG-based transmission and the total-DAI value is a specific value, there may be no HARQ-ACK bit for CBG-based transmission. Also, if the UE does not receive any PDCCH scheduling TB-based transmission and the total-DAI value is a specific value, there may be no HARQ-ACK bits for TB-based transmission. The UE can construct an entire HARQ-ACK bit sequence by sequentially connecting the HARQ-ACK bit sequence for each CBG-based transmission and the HARQ-ACK bit sequence for TB-based transmission. For example, a HARQ-ACK bit sequence can be constructed by connecting a HARQ-ACK bit sequence for CBG-based transmission followed by a HARQ-ACK bit sequence for TB-based transmission. As another example, a HARQ-ACK bit sequence can be constructed by concatenating a HARQ-ACK bit sequence for TB-based transmission and a HARQ-ACK bit sequence for CBG-based transmission.

이다. 컴포넌트 캐리어 #1, #4은 TB 기반 전송된 PDSCH TB-tx #0,TB-tx #1이 스케줄링되어 있고, i=0,1에 대하여 상기 TB-tx #i 의 HARQ-ACK은

이다. 또한, total-DAI값이 3이므로 가상의 TB 기반 전송된 PDSCH TB-tx #2,TB-tx #3이 존재하며, i=2,3에 대하여, 상기 TB-tx #i의 HARQ-ACK은

이다. 참고로 가상이라는 표현은 실제로 컴포넌트 캐리어로 전송되지 않았음을 명시한다. CBG 기반 전송을 위한 HARQ-ACK bit sequence 다음에 TB 기반 전송을 위한 HARQ-ACK bit sequence를 연결하여 HARQ-ACK bit sequence를 구성할 경우, HARQ-ACK bit sequence는

이다. 참고로 TB 기반 HARQ-ACK의 마지막 2bits (

)는 기지국과 단말간의 HARQ-ACK bit sequence의 오해를 방지하기 위한 것으로, 쓸모없는 ACK/NACK 정보를 가진 dummy bits이다. FIG. 19 is an example using the number of PDSCHs transmitted based on the CBG with a total-DAI value. Here, it is assumed that the TB-based HARQ-ACK transmission is 1 bit. Referring to Fig. 19, total-DAI = 3. Therefore, PDSCHs transmitted based on 4 * n CBGs and PDSCHs transmitted based on 4 * m TBs may be scheduled for non-negative integers m and n. CBG-tx # 1, CBG-tx # 2 and CBG-tx # 3 are scheduled for component carriers # 0, # 3, # 5 and # , 1, 2, and 3, the HARQ-ACK of the CBG-tx # i

to be. The TB-tx # 0 and TB-tx # 1 are scheduled for the TBs based on the TBs # 1 and # 4, and the HARQ-ACK of the TB-tx # i for i =

to be. In addition, DAI-total value is 3, so the virtual TB based on the transmitted PDSCH TB-tx # 2, TB -tx # 3 are present and, for i = 2,3, the TB-tx # i of the HARQ-ACK is

to be. Note that the expression virtual is not actually transmitted on the component carrier. When the HARQ-ACK bit sequence for CBG-based transmission is followed by the HARQ-ACK bit sequence for TB-based transmission, the HARQ-ACK bit sequence is transmitted

to be. Note that the last 2 bits of the TB-based HARQ-ACK (

) Is a dummy bit with useless ACK / NACK information to prevent a misunderstanding of the HARQ-ACK bit sequence between the Node B and the UE.

이다. 또한, total-DAI값이 1이므로 가상의 CBG 기반 전송된 PDSCH CBG-tx #4, CBG-tx #5이 존재하며, i=4,5에 대하여, 상기 CBG-tx #i 의 HARQ-ACK은

이다. 컴포넌트 캐리어 #1, #4은 TB 기반 전송된 PDSCH TB-tx #0,TB-tx #1이 스케줄링되어 있고, i=0,1에 대하여 상기 TB-tx #i 의 HARQ-ACK은

이다. CBG 기반 전송을 위한 HARQ-ACK bit sequence 다음에 TB 기반 전송을 위한 HARQ-ACK bit sequence를 연결하여 HARQ-ACK bit sequence를 구성할 경우, HARQ-ACK bit sequence는

FIG. 20 shows an example using the number of PDSCHs transmitted on a TB basis with a total-DAI value. Here, it is assumed that the TB-based HARQ-ACK transmission is 1 bit. Referring to Fig. 20, total-DAI = 1. Therefore, the PDSCH transmitted based on 4n + 2 CBG and the PDSCH transmitted based on 4m + 2 TB are scheduled for non-negative integers m and n. Component carriers # 0, # 3, # 5, # 7, and the PDSCH CBG-tx # 0, CBG-tx # 1, CBG-tx # 2, CBG-tx # 3 of the CBG based transmission scheduling, i = 0 , 1, 2, and 3, the HARQ-ACK of the CBG-tx # i

to be. In addition, DAI-total value is 1, because it is based on the transmitted fictitious CBG PDSCH CBG-tx # 4, CBG -tx # 5 are present and, with respect to i = 4,5, wherein the CBG-tx # i HARQ-ACK is

to be. The TB-tx # 0 and TB-tx # 1 are scheduled for the TBs based on the TBs # 1 and # 4, and the HARQ-ACK of the TB-tx # i for i =

to be. When the HARQ-ACK bit sequence for CBG-based transmission is followed by the HARQ-ACK bit sequence for TB-based transmission, the HARQ-ACK bit sequence is transmitted

) 는 기지국과 단말간의 HARQ-ACK bit sequence의 오해를 방지하기 위한 것으로, 쓸모없는 ACK/NACK 정보를 가진 dummy bits이다.to be. For reference, the last 2 * N bits of CBG-based HARQ-ACK (

) Is a dummy bit with useless ACK / NACK information to prevent a misunderstanding of the HARQ-ACK bit sequence between the Node B and the UE.

FIG. 21 shows an example when only one type of transmission scheme is scheduled. Here, it is assumed that the TB-based HARQ-ACK transmission is 1 bit. Further, it is assumed that a specific value indicating that one transmission scheme is not scheduled is 3 (11 in binary). FIG. 21 (a) shows a case in which 1 indicates the number of TB-based PDSCHs scheduled with the total-DAI value. In this case, there must be two PDSCHs indicating a virtual CBG-based transmission. Thus, there is a dummy bit (s) of 2 * N bits. In this case, since two CBG-based transmissions may be detected, only two PDCCHs for TB-based transmission may be detected. Therefore, 2 * N dummy bits (s) for two CBG-based transmissions are all transmitted in NACK, When scheduling is performed, the BS can determine that the UE is a DTX due to the failure of receiving the corresponding PDCCH. FIG. 21B shows a case where the total-DAI value indicates a specific value 3 (binary 11) indicating that the CBG transmission is not scheduled. The UE does not receive the PDCCH for scheduling the CBG-based transmission and can determine that there is no CBG-based transmission since the total-DAI value is 3 (11 in binary). Therefore, there is no CBG-based HARQ-ACK in the HARQ-ACK bit sequence, and only TB-based HARQ-ACK can exist. Here, since the PDCCH is scheduled for all component carriers and the PDCCH for scheduling the TB-based transmission is two, the PDCCH indicating the virtual TB transmission can be determined to have failed to receive two PDCCHs. Thus, there are 2 bits of dummy bits. In this case, since two PDCCHs may be actually detected when only four PDSCHs are transmitted, which are TB-based transmissions, the 2-bit dummy bits (s) are all transmitted in NACK. If the base station performs scheduling on a specific component carrier, So that the base station can determine that it is DTX.

When the UE using HARQ-ACK multiplexing is composed of TB-based transmission and CBG-based transmission, the PDSCH transmitted in the TB is transmitted in the 1-bit or 2-bit HARQ-ACK feedback and the PDSCH Is always transmitted with N bits of HARQ-ACK feedback. Now, suppose that the CBG-based transmission can be transmitted in HARQ-ACK feedback with one bit length of 1, 2, ..., N bits. For example, the CBG-based transmission may only feedback HARQ-ACKs for CBGs scheduled for the current transmission, and the HARQ-ACK feedback length may be equal to the number of CBGs scheduled for the current transmission. In the following description, it is assumed that the TB-based transmission consists of one CBG. That is, the PDSCH including 1 TB is assumed to be PDSCH including 1 CBG, and the PDSCH including 2 TBs is assumed to be PDSCH including 2 CBGs. Therefore, it does not use the expression of separate TB-based transmission or CBG-based transmission. For reference, when the UE receives the PDCCH, it can know whether the scheduled PDSCH is a TB-based transmission, a CBG-based transmission, or the number of included CBGs.

When the PDSCH is transmitted on a CBG basis, when the HARQ-ACK feedback for the PDSCH is set to one bit length of 1, 2, ..., N bits, in the first embodiment of the present invention, DAI and total-DAI fields. The counter-DAI field and the total-DAI field are mapped to the counter-DAI field and the total-DAI field, and the UE transmits the counter-DAI field and the total- DAI and total-DAI values. More specifically, the counter-DAI value is the number of CBGs from component carrier # 0 to the current component carrier, and the total-DAI value can be the number of CBGs allocated to all component carriers. Referring to FIG. 22, when the PDSCH is transmitted to the UEs on the component carriers # 0, # 1, # 3, # 4, # 5 and # 7, the component carrier # 0 includes two CBGs, # 3 contains one CBGs, # 4 contains 4 CBGs, # 5 contains 3 CBGs, and # 7 contains 3 CBGs. (Counter-DAI, total-DAI) value of the PDCCH corresponding to the component carrier # 0 is (0,16), and the counter-DAI, total-DAI value of the PDCCH corresponding to the component carrier # (Counter-DAI, total-DAI) value of the PDCCH corresponding to the component carrier # 3 is (5,16), and the value of the counter-DAI, total-DAI (Counter-DAI, total-DAI) values of the PDCCH corresponding to the component carrier # 5 are (10,16), and the counter-DAI, total -DAI) value is (13,16).

When the UE receives the PDCCH, it can know the number of CBGs included in the PDSCH scheduled by the PDCCH through the total-DAI value, and determine the number of CBGs included in the PDSCH scheduled by the PDCCH through the counter- . The PDSCH scheduled by the PDCCH includes k CBGs, and if (counter-DAI, total-DAI) = (C, T), the PDSCHs scheduled for component carriers include T CBGs, CBGs of PDGCHs are CBGs of C + 1, ..., C + k among T CBGs. For example, if the UE successfully receives the PDCCH scheduling PDSCH of the component carrier # 3, the UE can recognize that the corresponding PDSCH includes one CBG through the CBG scheduling information included in the PDCCH, , total-DAI) = (5,16), and CBG is the sixth CBG.

The UE can configure the HARQ-ACK bit sequence as follows. First, the UE may have the same HARQ-ACK bit length as the total-DAI value. (If the total-DAI is expressed as B-bit, then the possible HARQ-ACK bit length is 2 ^ B * n + total-DAI, where n is a non-negative integer and PDSCHs scheduled by PDCCHs ACK bits of the CBGs of the CBGs included in the CBGs) of the CBGs scheduled by the PDCCH through the counter-DAI value of the successfully received PDCCH and the number (k) of CBGs. The positions of the HARQ-ACK bits are counter-DAI + 1, counter-DAI + 2, ..., counter-DAI + k. (If the counter-DAI is expressed as A-bit, the possible positions of HARQ-ACK bits are 2 ^ A * m + counter-DAI where m is a nonnegative integer.) HARQ- -ACK bits Unmapped bits are NACK.

The first embodiment described above can know the number of CBGs included in the PDSCHs scheduled in the component carriers and the position of the CBGs of the PDSCH scheduled by the current PDCCH by successfully receiving the PDCCH, I can not know.

When the PDSCH is transmitted based on the CBG, when the HARQ-ACK feedback for the PDSCH is set to one bit length of 1, 2, ..., N bits, in the second embodiment of the present invention, DAI # 2 and the counter-DAI # 1 and the counter-DAI # 1 and the counter-DAI # 1 and the counter-DAI # the total-DAI # 1 field, the total-DAI # 2 field, the total-DAI # 1 field, and the total-DAI # 2 field mapped to the PDCCH. The counter-DAI # 1 value and the total-DAI # 1 value for the PDSCH number and the counter-DAI # 2 value and the total-DAI # 2 value for the CBG number can be obtained in the DAI # 2 field. More specifically, the counter-DAI # 1 value indicates the number of scheduled PDSCHs from component carrier # 0 to before the current component carrier, and the total-DAI # 1 value indicates the value obtained by subtracting 1 from the number of PDSCHs scheduled for all component carriers . The number of scheduled CBGs from component carrier # 0 to the current component carrier can be known by counter-DAI # 2 value, and the number of CBGs scheduled for all component carriers by total-DAI # 2 value can be known. The counter-DAI # 1 and total-DAI # 1 values can be used to determine the number of CBGs in the counter-DAI # 2 and total-DAI # 2 values. For example, if the number of CBGs scheduled from component carrier # 0 to before the current component carrier is P and the counter-DAI # 1 value of the current component carrier is C1, counter-DAI # 2 may be C2 = P-C1. Also, if the number of CBGs scheduled for all component carriers is Q and the total-DAI # 2 value is T2, the total-DAI # 2 may be T2 = Q-T1. Referring to FIG. 23, when the PDSCH is transmitted to the UEs on the component carriers # 0, # 1, # 3, # 4, # 5 and # 7, the component carrier # 0 includes two CBGs, # 3 contains one CBGs, # 4 contains 4 CBGs, # 5 contains 3 CBGs, and # 7 contains 3 CBGs. The values (counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) of the PDCCH corresponding to the component carrier # 0 are (0,5,0,11) (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # (2, 3, 11) of the PDCCH corresponding to the component carrier # 4 are (2, 3, 11) (counter-DAI # 1, total-DAI # 1, counter-DAI # 2 and total-DAI # 2) values are (3,5,3,11) DAI # 1, total DAI # 1, counter DAI # 2 and total DAI # 2) is (4,5,6,11), and the counter- , total-DAI # 1, counter-DAI # 2, total-DAI # 2) is (5,5,8,11).

When the UE receives the PDCCH, it can know the number of CBGs included in the PDSCH scheduled by the PDCCH. The number of PDSCHs scheduled in the component carriers through the counter-DAI # 1 value and the total-DAI # It is possible to know how many PDSCHs the PDSCH scheduled by the PDSCH is. Also, through the counter-DAI # 2 value and the total-DAI # 2 value, it is possible to know the number of CBGs including PDSCHs scheduled in the component carrier and how many CBGs the PDGCHs including the PDSCH scheduled by the current PDCCH are. 1, counter-DAI # 2, total-DAI # 2) = (C1, T1, C2, C2), the PDSCH currently scheduled by the PDCCH includes k CBGs. , The component carrier includes T1 + 1 PDSCHs and T1 + T2 CBGs. Also, the PDSCH scheduled by the PDCCH is scheduled at the C1-th time, and the CBGs included in the PDSCH are C1 + C2 + 1, C1 + C2 + 2, ..., C1 + C2 + k-th CBGs.

The UE can determine that decoding of the PDCCH has failed if the order of the counter-DAI # 1 values is not appropriate (for example, 0-> 1-> 2-> 3 ... order). The UE can determine that decoding of the PDCCH fails after the PDCCH last received successfully if the value of the counter-DAI # 1 notified by the PDCCH last received successfully is not equal to the value of the total-DAI # 1. At this time, the number of PDCCHs that failed to receive after the last successful PDCCH can be known by the difference between the total-DAI # 1 value and the counter-DAI # 1 value.

The UE can configure the HARQ-ACK bit sequence as follows. First, the UE can have the same number of HARQ-ACK bits as the total-DAI # 1 + total-DAI # 2 values. The UE can determine the location of the HARQ-ACK bits of the CBGs scheduled by the PDCCH through the counter-DAI # 1 value, the counter-DAI # 2 value, and the CBG number (k) of the successfully received PDCCH. (C 1, C 2, C 2) = (C 1, C 1, C 2, C 2) C1 + C2 + 2, ..., C1 + C2 + k. The total length of HARQ-ACK bits is T1 + T2. Among the HARQ-ACK bit sequence, bits for which HARQ-ACK bits are not mapped are NACK.

The second embodiment described above can know the number of CBGs included in the PDSCHs scheduled in the component carriers and the positions of the CBGs of the PDSCH scheduled by the current PDCCH by successfully receiving the PDCCH. . However, UCI overhead is high.

When the PDSCH is transmitted based on the CBG, when the HARQ-ACK feedback for the PDSCH is set to one bit length of 1, 2, ..., N bits, in the third embodiment of the present invention, DAI # 1 field, a counter-DAI # 2 field, a total-DAI # 1 field, and a counter-DAI # And the UE can transmit the counter-DAI # 1 value and the total-DAI # 1 value for the PDSCH number in the counter-DAI # 1 field, the counter-DAI # 2 field and the total- And a counter-DAI # 2 value for the CBG number can be obtained. More specifically, the counter-DAI # 1 value indicates the number of scheduled PDSCHs from component carrier # 0 to before the current component carrier, and the total-DAI # 1 value indicates the value obtained by subtracting 1 from the number of PDSCHs scheduled for all component carriers . From the counter-DAI # 2 value, we can know the number of CBGs contained in the K PDSCHs before the current component carrier. For reference, K PDSCHs are determined cyclically before the current component carrier. That is, if there are k PDSCHs from the first component carrier to the current component carrier, K-k PDSCHs are the PDSCHs that are the closest to the last component carrier. Preferably, the value of K can be determined according to the value of total-DAI # 1. In one embodiment, if total-DAI is 1 (one PDSCH scheduling for all component carriers), K = 0, total-DAI is 2 (two PDSCH scheduling for all component carriers) (3 PDSCH scheduling for all component carriers) K = 2, if total-DAI is greater than 3 (more than 4 PDSCH scheduling for all component carriers) K = 3. Preferably, the counter-DAI # 2 value may be a value obtained by subtracting K from the number of CBGs included in the K PDSCHs before the current component carrier.

24, when the PDSCH is transmitted to the UEs on the component carriers # 0, # 1, # 3, # 4, # 5 and # 7, the component carrier # 0 includes two CBGs, # 3 contains one CBGs, # 4 contains 4 CBGs, # 5 contains 3 CBGs, and # 7 contains 3 CBGs. The value of (counter-DAI # 1, total-DAI # 1, counter-DAI # 2) of the PDCCH corresponding to the component carrier # 0 is (0,5,7) (Counter-DAI # 1, total-DAI # 1, total-DAI # 1 and counter-DAI # 2) of the PDCCH corresponding to component carrier # counter-DAI # 2) values are (2, 5, 5), and the (counter-DAI # 1, total-DAI # 1, counter-DAI # 2) values of the PDCCH corresponding to the component carrier # (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2) values of the PDCCH corresponding to the component carrier # 5 are (4,5,5) (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2) values of the PDCCH corresponding to 7 are (5, 5, 5).

The UE can determine that decoding of the PDCCH has failed if the order of the counter-DAI # 1 values is not appropriate (for example, 0-> 1-> 2-> 3-> 0 ... order). The UE can determine that decoding of the PDCCH fails after the PDCCH last received successfully if the value of the counter-DAI # 1 notified by the PDCCH last received successfully is not equal to the value of the total-DAI # 1. At this time, the number of PDCCHs that failed to receive after the last successful PDCCH can be known by the difference between the total-DAI # 1 value and the counter-DAI # 1 value. The counter-DAI # 2 value can be used to determine the number of CBGs included in the PDSCH scheduled by the failed PDCCH. Since the counter-DAI # 2 value includes the number of CBGs before the current PDCCH, the number of CBGs included in the PDSCH scheduled by the PDCCH failed to receive can be known through the counter-DAI # 2 values. For example, suppose that reception of PDCCH satisfying counter-DAI # 1 = 2 fails and that the remaining PDCCHs are successfully received. Since the UE does not have a value of 2 of the counter-DAI # 1 values of PDCCHs that have successfully received, it is possible to know the reception failure of the PDCCH satisfying the counter-DAI # 1 = 2. The number of CBGs included in the PDSCH scheduled by the PDCCH that satisfies counter-DAI # 1 = 2 is determined by the counter-DAI # 2 value of the PDCCH with counter-DAI # 1 = 3 and the counter- And the number of CBGs of CBG. That is, the counter-DAI # 2 value of the PDCCH with counter-DAI # 1 = 3 is 3 and the CBGs of the PDCCH with counter-DAI # 1 = 0,1 are 2 and 3, respectively. Therefore, the number of CBG scheduled by the PDCCH satisfying counter-DAI # 1 = 2 can be obtained by the following equation. (2 + 3 + x) -K = 3 It can be seen that x = 1 since K = 3.

Referring to FIG. 25, the UE can configure the HARQ-ACK bit sequence as follows. As described above, the UE can know the number of PDSCHs transmitted to the component carrier through counter-DAI # 1 and total-DAI # 1. Also, the number of CBGs transmitted to each component carrier can be found through counter-DAI # 2. Accordingly, the HARQ-ACK configuration can be configured by increasing the counter-DAI # 1 from 0 to the value of total-DAI # 1 and attaching the HARQ-ACK bits. In a preferred embodiment of the present invention, when K = 2 or 3, header bits indicating the configuration information of the HARQ-ACK bit sequence can be transmitted at the beginning or end of the HARQ-ACK bit sequence. For example, if the HARQ-ACK bit sequence increases cyclically starting from counter-DAI # 1 = i, header bits corresponding to i can be transmitted at the beginning or end of the HARQ-ACK bit sequence . In FIG. 26, when K = 2 or 3, the HARQ-ACK bit sequence that the UE can transmit is one of four candidates. Here, the 2-bit header bits indicate the HARQ-ACK for the PDSCH starting from the third bit. For example, if the first 2 bits are 00, the third bit starts from the HARQ-ACK bits of the first PDSCH. For example, if the first 2 bits are 01, the third bit starts from the HARQ-ACK bits of the second PDSCH. For example, if the first 2 bits are 10, the third bit starts from the HARQ-ACK bits of the third PDSCH. For example, if the first 2 bits are 11, the third bit starts from the HARQ-ACK bits of the fourth PDSCH.

In the third embodiment described above, by successfully receiving the PDCCH, it is possible to know the number of PDSCHs scheduled in the component carriers and the current PDSCH among the entire PDSCHs. Also, the counter-DAI # 2 value provides information on the number of CBGs. Compared with the second embodiment, since there is no total-DAI # 2, the overhead of the downlink control channel can be reduced. However, since it is necessary to transmit header bits to the HARQ-ACK bit sequence transmitted from the UE, The overhead can be increased.

When the PDSCH is transmitted based on the CBG, when the HARQ-ACK feedback for the PDSCH is set to one bit length of 1, 2, ..., N bits, in the fourth embodiment of the present invention, The transmission type is divided into a type 1 transmission and a type 2 transmission according to the number of CBGs transmitted, and a counter-DAI # 1 value for the number of independent PDSCHs, a counter for the total-DAI # 1 value and a CBG number -DAI # 2 value and the total-DAI # 2 value in the counter-DAI # 1 field, the total-DAI # 1 field, the counter-DAI # 2 field and the total-DAI # 2 field of the PDCCH. A counter-DAI # 1 value, a total-DAI # 1 value, a counter-DAI # 2 value, and a total-DAI # 2 value. When the UE receives the PDCCH, it can know the number of scheduled CBGs and know the type of transmission depending on the number. In addition, the counter-DAI # 1 field, the total-DAI # 1 field, the counter-DAI # 2 field, and the total-DAI # 2 field value can be interpreted as the value of the corresponding type.

CBG들을 가지는 PDSCH 전송이고, type 2 전송은

+1,

+2,...,N CBG들을 가지는 PDSCH 전송이다. 또한, type 1 전송은 1,2,...,

CBG들을 가지는 PDSCH 전송이고, type 2 전송은

+1,

+2,...,N CBG들을 가지는 PDSCH 전송이다. 이 방식을 사용하면, 이후 설명에서

는

로 대체될 수 있다. 여기서

는 x보다 작거나 같은 수 중 가장 큰 자연수,

는 x보다 크거나 같은 수 중 가장 작은 자연수이다. Preferably, type 1 transmissions are 1, 2, ...,

PDSCH transmission with CBGs, type 2 transmission

+1,

+ 2, ..., N CBGs. Also, the type 1 transmission is 1, 2, ...,

PDSCH transmission with CBGs, type 2 transmission

+1,

+ 2, ..., N CBGs. Using this method, in the following description

The

≪ / RTI > here

Is the largest natural number of numbers less than or equal to x,

Is the smallest natural number of numbers greater than or equal to x.

+1)*C1일 수 있다. 또한, 모든 컴포넌트 캐리어에 스케줄링된 type-2 전송 PDSCH가 포함하는 CBG들의 수가 Q이고 total-DAI#1 값이 T1이면 total-DAI#2는 Q-(

+1)*(T1+1)일 수 있다. More specifically, the value of the counter-DAI # 1 mapped to the counter-DAI # 1 field of the PDCCH for scheduling the PDSCH for type-1 transmission is the value of the type-1 transmission PDSCH The total-DAI # 1 value mapped to the total-DAI # 1 field indicates a value obtained by subtracting 1 from the number of type-1 transmission PDSCHs scheduled for all the component carriers, The mapped counter-DAI # 2 value indicates the number of CBGs included in the type-1 transmission PDSCH scheduled from component carrier # 0 to before the current component carrier, and the total-DAI # 2 value mapped in the total- Informs the number of CBGs included in the type-1 transport PDSCH scheduled for all component carriers. Preferably, counter-DAI # 1 and total-DAI # 1 values can be used to determine the number of CBGs included in the type-1 transmission PDSCH through counter-DAI # 2 and total-DAI # 2 values . For example, if the number of CBGs included in the scheduled type-1 transport PDSCH from component carrier # 0 to before the current component carrier is P and the counter-DAI # 1 value of the current component carrier is C1, counter-DAI # Lt; / RTI > In addition, if the number of CBGs included in the type-1 transmission PDSCH scheduled for all component carriers is Q and the total-DAI # 2 value is T2, the total-DAI # 2 may be Q-T2. The value of the counter-DAI # 1 of the PDCCH for scheduling PDSCH for type-2 transmission indicates the number of type-2 transmission PDSCHs scheduled from component carrier # 0 to the current component carrier, and total-DAI # 2 indicates the number of CBGs included in the scheduled type-2 transmission PDSCH from the component carrier # 0 to the current component carrier, and the total-DAI # 2 value The number of CBGs included in the type-2 transmission PDSCH scheduled for all component carriers can be known. In a preferred embodiment of the present invention, when the number of CBGs included in the type-2 transmission PDSCH is found in the values of the counter-DAI # 2 and the total-DAI # 2, And the number of minimum CBGs used for type 2 transmission. For example, if the number of CBGs included in the type-2 transport PDSCH scheduled from component carrier # 0 to before the current component carrier is P and the counter-DAI # 1 value of the current component carrier is C1, counter-DAI #

+1) * C1. In addition, if the number of CBGs included in the type-2 transmission PDSCH scheduled for all component carriers is Q and the total-DAI # 1 value is T1, total-DAI # 2 is Q-

+1) * (T1 + 1).

26, when the PDSCH is transmitted to the UEs on the component carriers # 0, # 1, # 3, # 4, # 5 and # 7, the component carrier # 0 includes two CBGs, # 3 contains one CBGs, # 4 contains 4 CBGs, # 5 contains 3 CBGs, and # 7 contains 4 CBGs. The PDSCH scheduled for component carriers # 0 and # 3 is type 1 transmission, and the PDSCH scheduled for component carriers # 1, # 4, # 5, and # 7 is type 2 transmission. (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 0 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 3 transmitting the Type- 1, 1, 1). (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 1 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 4 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 5 transmitting the Type-2 PDSCH (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 1) of the PDCCH corresponding to component carrier # 7 transmitting the Type- # 2) The value is (3,3,1,2).

+1이다. Table 6 summarizes the method of analyzing when the terminal receives DAI values according to the above-described method. Referring to Table 6, when the UE receives the PDCCH, the number of PDSCHs of the transmission type scheduled in the component carriers through counter-DAI # 1 and total-DAI # 1 and the number of PDSCHs of the transmission type scheduled by the current PDCCH Th PDSCH. Also, through the counter-DAI # 2 and the total-DAI # 2, it is possible to know the number of CBGs including the PDSCHs of the transmission type scheduled for the component carrier and the number of CBGs including the PDSCH of the transmission type scheduled by the current PDCCH have. The PDSCH, which is currently scheduled by the PDCCH, includes k CBGs. When the transmission type is x (x = 1 or 2), (counter-DAI # 1, total-DAI # 1, counter- The PDSCH is the (C1 + 1) th type-x PDSCH, and the type-x PDSCH scheduled by the current PDCCH is M _x * C1 _{+ C2 + 1, M x *} C1 + M x * C2 + 2, ..., M x * C1 + C2 + k are second CBG. Here, if _x = 1 and M _x = 1 and x = 2, then M _x =

+1.

Detected PDCCH UE's Interpretation Counter-DAI # 1 (C1) Total-DAI # 1 (T1) Counter-DAI # 2 (C2) Total-DAI # 2 (T2) PDCCH scheduling type-1 PDSCH # of scheduled type-1 PDSCHs from CC # 0 to previous CC = C1 # of scheduled type-1 PDSCHs in all CCs = T1 + 1 # of CBGs included in type-1 PDSCHs from CC # 0 to previous CC = C1 + C2 # of CBGs included in type-1 PDSCHs in all CCs = T1 + 1 + T2 PDCCH scheduling type-2 PDSCH # of scheduled type-2 PDSCHs from CC # 0 to previous CC = C1 # of scheduled type-2 PDSCHs in all CCs = T1 + 1

+1)*C1+C2# of CBGs included in type-2 PDSCHs from CC # 0 to previous CC = (

+1) * C1 + C2 # of CBGs included in type 2 PDSCHs in all CCs = (

+1) * (T1 + 1) + T2

The UE can determine that decoding of the PDCCH has failed if the order of the counter-DAI # 1 values is not appropriate (for example, 0-> 1-> 2-> 3 ... order). The UE can determine that decoding of the PDCCH fails after the PDCCH last received successfully if the value of the counter-DAI # 1 notified by the PDCCH last received successfully is not equal to the value of the total-DAI # 1. At this time, the number of PDCCHs that failed to receive after the last successful PDCCH can be known by the difference between the total-DAI # 1 value and the counter-DAI # 1 value.

이다.Referring to FIG. 27, the UE can configure the HARQ-ACK bit sequence as follows. First, the UE can collect HARQ-ACKs for the type-1 PDSCH in the order of counter-DAI # 1. At this time, 'NACK' can be used as the HARQ-ACK for the PDSCH that failed to receive the PDCCH. The UE can collect HARQ-ACKs for type-2 based transmission in the order of counter-DAI # 1. At this time, 'NACK' can be used as the HARQ-ACK for the PDSCH that failed to receive the PDCCH. If the UE does not receive any PDCCH for scheduling the type-1 PDSCH, the HARQ-ACK bit of the type-1 PDSCH may not exist. If the UE does not receive any PDCCH for scheduling the type-2 PDSCH, the HARQ-ACK bit of the type-2 transmission PDSCH may not exist. The UE can construct an entire HARQ-ACK bit sequence by sequentially connecting HARQ-ACK bit sequences for each type-1 based PDSCH transmission and HARQ-ACK bit sequences for type-2 based PDSCH transmission. For example, a HARQ-ACK bit sequence can be constructed by concatenating a HARQ-ACK bit sequence for type-2 based PDSCH transmission followed by a HARQ-ACK bit sequence for type-1 based PDSCH transmission. As another example, a HARQ-ACK bit sequence can be constructed by connecting a HARQ-ACK bit sequence for type-1 based PDSCH transmission followed by a HARQ-ACK bit sequence for type-2 based PDSCH transmission. Referring to FIG. 28, the HARQ-ACK bit sequence constructed by the UE

to be.

The fourth embodiment described above can divide the transmission according to the CBG into two types and have independent DAI values according to each type. Therefore, the overhead of the downlink control channel can be reduced. However, PDCCHs of different types should always be received.

When the PDSCH is transmitted based on the CBG, when the HARQ-ACK feedback for the PDSCH is set to one bit length of 1, 2, ..., N bits, the BS transmits PDSCH The transmission type is divided into a type 1 transmission and a type 2 transmission according to the number of CBGs transmitted, and a counter-DAI # 1 value for the number of independent PDSCHs, a counter for the total-DAI # 1 value and a CBG number DAI # 2 value of the same type as that transmitted by the PDCCH in the counter-DAI # 1 field and the counter-DAI # 2 field of the PDCCH. , the counter-DAI # 2 value and the total-DAI # 1 field and the total-DAI # 2 field according to the counter-DAI # 1 value, the total-DAI # 2 values, or the total-DAI # 1 and total-DAI # 2 values corresponding to the type-2 transmission. If the value of the counter-DAI # 1 is an even number, the total-DAI # 1 field and the total-DAI # 2 field corresponding to the same type transmission as the PDSCH scheduled by the PDCCH, 1 value corresponding to a type transmission different from the PDSCH scheduled by the PDCCH in the total-DAI # 1 field and the total-DAI # 2 field when the value of the counter-DAI # 1 is an odd number, -DAI # 2.

The counter-DAI # 1, counter-DAI # 2, total-DAI # 1, and totla-DAI # 2 values are the same as in the fourth embodiment.

Referring to FIG. 28, when the PDSCH is transmitted to the UEs on the component carriers # 0, # 1, # 3, # 4, # 5 and # 7, the component carrier # 0 includes two CBGs, # 3 contains one CBGs, # 4 contains 4 CBGs, # 5 contains 3 CBGs, and # 7 contains 4 CBGs. The PDSCH scheduled for component carriers # 0 and # 3 is type 1 transmission, and the PDSCH scheduled for component carriers # 1, # 4, # 5, and # 7 is type 2 transmission. (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 0 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 3 transmitting the Type- 3, 1, 2). (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 1 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 4 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) of the PDCCH corresponding to the component carrier # 5 transmitting the Type-2 PDSCH (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 1) of the PDCCH corresponding to component carrier # 7 transmitting the Type- # 2) The value is (3,1,1,1).

The HARQ-ACK bit sequence can be generated in the same manner as in the fourth embodiment described above.

In the above-described fifth embodiment, transmission is divided into two types according to the CBG, and independent DAI values can be obtained according to each type. And the total-DAIs may correspond to type-1 or type-2 depending on the counter-DAI value. However, it should always receive a PDCCH indicating different types of total-DAI.

When the PDSCH is transmitted based on the CBG, when the HARQ-ACK feedback for the PDSCH is set to one bit length of 1, 2, ..., N bits, in the sixth embodiment of the present invention, The transmission type is divided into a type 1 transmission and a type 2 transmission according to the number of CBGs transmitted, and a counter-DAI # 1 value for the number of independent PDSCHs and a counter-DAI # 2 value for the CBG number are generated And can generate a total-DAI # 1 value for the same PDSCH number and a total-DAI # 2 value for the CBG number. The counter-DAI # 1 field and the counter-DAI # 2 field of the same type as the type transmitted by the PDCCH are mapped to the counter-DAI # 1 field and the counter-DAI # In the -DAI # 2 field, a common total-DAI # 1 value and a total-DAI # 2 value are mapped regardless of the transmission type. Preferably, when scheduling only one transmission type, the common total-DAI # 1 value may be a specific value. The specific value may be 4 (binary 11), 4 (binary 11) or 8 (binary) when using the 2-bit total-DAI # 1 value, 111). Preferably, the total-DAI # 1 field and the total-DAI # 2 may be set to values that minimize HARQ-ACK feedback.

The counter-DAI # 1 and counter-DAI # 2 values are the same as in the fourth embodiment.

29, when the PDSCH is transmitted to the UEs on the component carriers # 0, # 1, # 3, # 4, # 5 and # 7, the component carrier # 0 includes two CBGs, # 3 contains one CBGs, # 4 contains 4 CBGs, # 5 contains 3 CBGs, and # 7 contains 4 CBGs. Assume that the values of total-DAI # 1 and total-DAI # 2 are determined according to type-2 transmission. The PDSCH scheduled for component carriers # 0 and # 3 is type 1 transmission, and the PDSCH scheduled for component carriers # 1, # 4, # 5, and # 7 is type 2 transmission. (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 0 transmitting the Type- 2), and the (counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 3 transmitting the Type- 3, 1, 2). (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 1 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) values of the PDCCH corresponding to the component carrier # 4 transmitting the Type- (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 2) of the PDCCH corresponding to the component carrier # 5 transmitting the Type-2 PDSCH (Counter-DAI # 1, total-DAI # 1, counter-DAI # 2, total-DAI # 1) of the PDCCH corresponding to component carrier # 7 transmitting the Type- # 2) The value is (3,3,1,2).

The HARQ-ACK bit sequence can be generated in the same manner as in the fourth embodiment described above. Referring to FIG. 30, since (3, 2) is used instead of (1,1) as (total-DAI # 1, total-DAI # 2) for the type-1 PDSCH, two PDSCHs are virtually transmitted, The two PDSCHs include a total of three CBGs. Therefore, the HARQ-ACK bit sequence shall be accompanied by 3-bit dummy bits.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (1)

Method and apparatus for transmitting and receiving data between a terminal and a base station

Images