WO2020027546A1

WO2020027546A1 - Method for transmitting harq-ack information on basis of polling in wireless communication system, and iab node using method

Info

Publication number: WO2020027546A1
Application number: PCT/KR2019/009485
Authority: WO
Inventors: 유향선; 이윤정
Original assignee: 엘지전자 주식회사
Priority date: 2018-08-01
Filing date: 2019-07-30
Publication date: 2020-02-06

Abstract

The present invention provides a method for transmitting polled hybrid automatic repeat request ACK (HARQ-ACK) information by a first node in a wireless communication system, the method comprising receiving a plurality of physical downlink shared channels (PDSCH) from a second node, and transmitting, to the second node, on a specific resource, polled HARQ-ACK information for the plurality of PDSCHs, wherein the polled HARQ-ACK information includes a plurality of HARQ-ACK information for the respective PDSCHs.

Description

Polling-based HARQ-ACK information transmission method in wireless communication system and IAB node using the method

The present invention relates to wireless communication, and more particularly, to a method for transmitting HARQ-ACK information based on polling in a wireless communication system and an IAB node using the method.

Recently, 3GPP standardization organizations are considering a network slicing scheme for implementing a plurality of logical networks on a single physical network in an NR system which is a 5G wireless communication system. The logical network should be able to support services having various requirements (eg, eMBB, mMTC, URLLC, etc.), and in the physical layer system of the NR system, it may have variable numerology according to the various services. A method of supporting an orthogonal frequency division multiplexing (OFDM) scheme is being considered. In other words, in the NR (New RAT) system, an OFDM scheme (or multiple access scheme) having a new multiplicity independent of each time and frequency resource region may be considered.

In addition, while the specific node transmits the HARQ-ACK to the parent node, the specific node may not be able to receive from another node. In addition, the specific node may not be able to perform transmission using a different beam direction. In addition, while a specific node transmits a HARQ-ACK to a parent node, another node may be restricted from performing reception only from the specific node.

Therefore, if it is not urgent data, it may not be efficient in terms of resource operation that a specific node transmits HARQ-ACK for the PDSCH every time.

Accordingly, in the present invention, the IAB node polls the HARQ-ACK for the PDSCH (received from another node) in the IAB environment, so that the IAB node transmits HARQ-ACK information for the plurality of PDSCHs at once. And / or proposes a configuration for transmitting the HARQ-ACK information for the plurality of PDSCH at a time when the IAB node performs UL.

The present invention provides a method for transmitting HARQ-ACK information based on polling in a wireless communication system and an IAB node using the method.

According to an embodiment of the present invention, in a method for transmitting polled Hybrid Automatic Repeat Request ACK (HARQ-ACK) information performed by a first node in a wireless communication system, a plurality of physical downlink shared channels (PDSCHs) may be used. Receiving from a second node and transmitting the polled HARQ-ACK information for the plurality of PDSCHs to a second node on a specific resource, wherein the polled HARQ-ACK information includes a plurality of HARQs for each of the plurality of PDSCHs; A method characterized by including -ACK information can be provided.

In this case, the first node and the second node may be an integrated access and backhaul (IAB) node.

In this case, the first node may be a child node, and the second node may be a parent node.

In this case, the first node and the second node may be connected by a backhaul link.

In this case, the specific resource is periodically present, and the polled HARQ-ACK information transmitted on the specific resource is received between the transmission time of the previous polled HARQ-ACK information and the transmission time of the upcoming polled HARQ-ACK information. It may include the plurality of HARQ-ACK information for each of a plurality of PDSCH.

In this case, the first node may transmit the polled HARQ-ACK information to the second node based on down control information (DCI).

In this case, the first node may transmit the polled HARQ-ACK information at a transmission time of an uplink message different from the polled HARQ-ACK information.

At this time, the transmission time of the other uplink message is the time when the transmission of the Physical Uplink Shared Channel (PUSCH) is allowed, the time when the transmission of the scheduling request (SR), or the transmission of the Sounding Reference Signal (SRS) is allowed It may be a time point, a time point at which transmission of a physical random access channel (PRACH) is allowed, or a time point at which transmission of channel state information (CSI) feeedback is allowed.

In this case, when the received values of the plurality of PDSCHs reach a preset value, the first node may transmit the polled HARQ-ACK information.

In this case, the preset value may be a value related to the amount of HARQ-ACK information that the first node can poll.

In this case, the predetermined value may be the maximum number of HARQ-ACK, the number related to the maximum codeword for transmitting HARQ-ACK, the maximum number of transmission blocks for transmitting HARQ-ACK, the maximum number of PDSCH for transmitting HARQ-ACK, It may be a value of a maximum downlink assignment index (DAI) for transmitting HARQ-ACK, or a value related to a value set from an upper layer.

In this case, the specific resource may be at least one of an uplink slot, a channel state information (CSI) transmission resource, a scheduling request (SR) transmission resource, a physical random access channel (PRACH) transmission resource, or a semi-fixed uplink slot.

According to another embodiment of the present invention, in a wireless communication system, a first node may include a memory, a transceiver, and a processor operatively coupled to the memory and the transceiver, and may include a plurality of physical downlink shared channels (PDSCHs). Receiving from two nodes and transmitting the polled HARQ-ACK information for the plurality of PDSCHs to a second node on a specific resource, wherein the polled HARQ-ACK information includes a plurality of HARQ- for each of the plurality of PDSCHs; A first node may be provided that includes ACK information.

According to another embodiment of the present invention, a processor for a wireless communication device in a wireless communication system, the processor receives the wireless communication device, a plurality of Physical Downlink Shared Channel (PDSCH) from a second node and the plurality of The polled HARQ-ACK information for the PDSCH of the transmitted to the second node on a specific resource, the polled HARQ-ACK information comprises a plurality of HARQ-ACK information for each of the plurality of PDSCH A processor may be provided.

According to the present invention, an IAB node polls HARQ-ACK for a PDSCH (received from another node) in an IAB environment, so that the IAB node transmits HARQ-ACK information for a plurality of PDSCHs at once, And / or a configuration is provided for transmitting HARQ-ACK information for the plurality of PDSCHs at a time when the IAB node performs UL, thereby increasing resource operation efficiency.

1 illustrates a wireless communication system.

2 is a block diagram illustrating a radio protocol architecture for a user plane.

3 is a block diagram illustrating a radio protocol structure for a control plane.

4 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.

5 illustrates a downlink subframe structure used in a 3GPP LTE (-A) system.

6 shows an example of an uplink subframe structure used in a 3GPP LTE (-A) system.

7 illustrates a system structure of a new generation radio access network (NG-RAN) to which NR is applied.

8 illustrates the functional division between NG-RAN and 5GC.

9 schematically illustrates an example of a frame structure based on a structure in which a data channel and a control channel are TDM (Time Division Multiplexing).

10 schematically illustrates an example for integrated access and backhaul links.

11 schematically illustrates an example of a link between a DgNB, RN, and a UE.

12 is a flowchart illustrating a method of transmitting HARQ-ACK information according to an embodiment of the present invention.

13 schematically illustrates an example of transmitting HARQ-ACK in response to reception of a PDSCH.

14 is a flowchart illustrating a method of transmitting HARQ-ACK information from a first node viewpoint according to an embodiment of the present invention.

15 is a block diagram schematically illustrating an example of an apparatus for transmitting HARQ-ACK information from a first node viewpoint according to an embodiment of the present invention.

16 is a flowchart illustrating a method of receiving HARQ-ACK information from a second node viewpoint according to an embodiment of the present invention.

17 is a block diagram schematically illustrating an example of an apparatus for receiving HARQ-ACK information from a second node viewpoint according to an embodiment of the present invention.

18 shows a UE implementing an embodiment of the present invention. The present invention described above with respect to the UE side can be applied to this embodiment.

19 shows a more detailed UE implementing an embodiment of the present invention.

20 illustrates a network node implementing an embodiment of the invention.

21 illustrates an example of a signal processing module structure in a transmission device.

22 illustrates another example of a signal processing module structure in a transmission device.

23 shows an example of a 5G usage scenario to which the technical features of the present invention can be applied.

Hereinafter, terms or abbreviations that are not separately defined may be defined in 3GPP TS 36 series or TS 38 series.

1 illustrates a wireless communication system. This may also be called an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), or Long Term Evolution (LTE) / LTE-A system.

The E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE). The terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), and a wireless device (Wireless Device). . The base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.

The base stations 20 may be connected to each other through an X2 interface. The base station 20 is connected to the Serving Gateway (S-GW) through the Mobility Management Entity (MME) and the S1-U through the Evolved Packet Core (EPC) 30, more specifically, through the S1 interface.

EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway). The MME has access information of the terminal or information on the capability of the terminal, and this information is mainly used for mobility management of the terminal. The S-GW is a gateway having an E-UTRAN as an endpoint, and the P-GW is a gateway having a PDN as an endpoint.

Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is well known in communication systems. L2 (second layer), L3 (third layer) can be divided into a physical layer belonging to the first layer of the information transfer service (Information Transfer Service) using a physical channel (Physical Channel) is provided, The RRC (Radio Resource Control) layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.

2 is a block diagram illustrating a radio protocol architecture for a user plane. 3 is a block diagram illustrating a radio protocol structure for a control plane. The user plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

2 and 3, a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel. The physical layer is connected to the upper layer MAC (Medium Access Control) layer through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.

Data moves between physical layers, that is, between physical layers of a transmitter and a receiver. The physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

Functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels. The MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.

Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs. In order to guarantee the various Quality of Service (QoS) required by the radio bearer (RB), the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode). Three modes of operation (AM). AM RLC provides error correction through an automatic repeat request (ARQ).

The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers. RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.

Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering. The functionality of the Packet Data Convergence Protocol (PDCP) layer in the control plane includes the transmission of control plane data and encryption / integrity protection.

The establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method. RB can be further divided into SRB (Signaling RB) and DRB (Data RB). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.

The downlink transmission channel for transmitting data from the network to the UE includes a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

It is located above the transport channel, and the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic (MTCH). Channel).

The physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain. One sub-frame consists of a plurality of OFDM symbols in the time domain. The RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers. In addition, each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel. Transmission Time Interval (TTI) is a unit time of subframe transmission.

4 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system. In particular, FIG. 4 shows a structure of a resource grid of a 3GPP LTE (-A) system. There is one resource grid per antenna port.

The slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol may mean a symbol period. Referring to FIG. 2, a signal transmitted in each slot may be represented by a resource grid including N ^DL ^{/ UL} _RB * N ^RB _sc subcarriers and N ^{DL / UL} _symb OFDM symbols. . Here, N ^DL _RB denotes the number of resource blocks (RBs) in the downlink slot, and N ^UL _RB denotes the number of _RBs in the UL slot. N ^DL _RB and N ^UL _RB depend on DL transmission bandwidth and UL transmission bandwidth, respectively. N ^DL _symb represents the number of OFDM symbols in the downlink slot, N ^UL _symb represents 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 called an OFDM symbol, an SC-FDM symbol, or the like according to a multiple access scheme. The number of OFDM symbols included in one slot may vary depending on the channel bandwidth and the length of the CP. For example, in case of a normal CP, one slot includes 7 OFDM symbols, whereas in case of an extended CP, one slot includes 6 OFDM symbols. Although FIG. 2 illustrates a subframe in which one slot includes 7 OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having other numbers of OFDM symbols in the same manner. Referring to FIG. 2, each OFDM symbol includes N ^DL ^{/ UL} _RB * N ^RB _sc subcarriers in the frequency domain. The types of subcarriers may be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of reference signals, null subcarriers for guard bands, and DC components. The null subcarrier for the DC component is a subcarrier that is left unused and is mapped to a carrier frequency (carrier freqeuncy, f ₀ ) in the OFDM signal generation process or the frequency upconversion process. The carrier frequency is also called the center frequency.

One RB is defined as N ^DL ^{/ UL} _symb (e.g. 7) consecutive OFDM symbols in the time domain and is defined by N ^RB _sc (e.g. 12) consecutive subcarriers in the frequency domain. Is defined. For reference, a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB is composed of N ^{DL / UL} _symb * N ^RB _sc resource elements. Each resource element in the resource grid may be uniquely defined by an index pair (k, 1) in one slot. k is an index given from 0 to N ^{DL / UL} _RB * N ^RB _sc -1 in the frequency domain, and l is an index given from 0 to N ^DL ^{/ UL} _symb -1 in the time domain.

Two RBs, each located in each of two slots of the subframe, are occupied by N ^RB _sc consecutive subcarriers in one subframe, are referred to as physical resource block (PRB) pairs. Two RBs constituting a PRB pair have the same PRB number (or also referred to as a PRB index). VRB is a kind of logical resource allocation unit introduced for resource allocation. VRB has the same size as PRB. According to the method of mapping the VRB to the PRB, the VRB is divided into a localized type VRB and a distributed type VRB. Localized type VRBs are mapped directly to PRBs, so that a VRB number (also called a VRB index) corresponds directly to a PRB number. That is, n _PRB = n _VRB . Localized VRBs are numbered in the order of 0 to N ^DL _VRB -1, where N ^DL _VRB = N ^DL _RB . Therefore, according to the localization mapping scheme, VRBs having the same VRB number are mapped to PRBs having the same PRB number in the first slot and the second slot. On the other hand, the distributed type VRB is mapped to the PRB through interleaving. Therefore, a distributed type VRB having the same VRB number may be mapped to different numbers of PRBs in the first slot and the second slot. Two PRBs, one located in two slots of a subframe and having the same VRB number, are referred to as VRB pairs.

5 illustrates a downlink subframe structure used in a 3GPP LTE (-A) system.

The DL subframe is divided into a control region and a data region in the time domain. Referring to FIG. 5, up to three (or four) OFDM symbols located at the front of the first slot of a subframe correspond to a control region to which a control channel is allocated. Hereinafter, a resource region available for PDCCH transmission in a DL subframe is called a PDCCH region. The remaining OFDM symbols other than the OFDM symbol (s) used as the control region correspond to a data region to which a Physical Downlink Shared Channel (PDSCH) is allocated. Hereinafter, a resource region available for PDSCH transmission in a DL subframe is called a PDSCH region. Examples of DL control channels used in 3GPP LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and the like. The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information on the number of OFDM symbols used for transmission of a control channel within the subframe. The PHICH carries an HARQ ACK / NACK (acknowledgment / negative-acknowledgment) signal in response to the UL transmission.

Control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI includes resource allocation information and other control information for the UE or UE group. For example, the DCI includes a transmission format and resource allocation information of a DL shared channel (DL-SCH), a transmission format and resource allocation information of an UL shared channel (UL-SCH), and a paging channel. channel, paging information on PCH), system information on DL-SCH, resource allocation information of higher-layer control messages such as random access response transmitted on PDSCH, Tx power control command set for individual UEs in UE group, Tx power Control instruction, activation instruction information of Voice over IP (VoIP), and the like. The DCI carried by one PDCCH has a different size and use depending on the DCI format, and its size may vary depending on a coding rate.

A plurality of PDCCHs may be transmitted in the PDCCH region of the DL subframe. The UE may monitor the plurality of PDCCHs. The BS determines the DCI format according to the DCI to be transmitted to the UE, and adds a cyclic redundancy check (CRC) to the DCI. The CRC is masked (or scrambled) with an identifier (eg, a radio network temporary identifier (RNTI)) depending on the owner of the PDCCH or the purpose of use. For example, when the PDCCH is for a specific UE, an identifier (eg, cell-RNTI (C-RNTI)) of the UE may be masked to the CRC. If the PDCCH is for a paging message, a paging identifier (eg, paging-RNTI (P-RNTI)) may be masked to the CRC. When the PDCCH is for system information (more specifically, a system information block (SIB)), a system information RNTI (SI-RNTI) may be masked to the CRC. When the PDCCH is for a random access response, a random access-RNTI (RA-RNTI) may be masked to the CRC. CRC masking (or scramble) includes, for example, XORing the CRC and RNTI at the bit level.

The PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs). CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel state. The CCE corresponds to a plurality of resource element groups (REGs). For example, one CCE corresponds to nine REGs and one REG corresponds to four REs. Four QPSK symbols are mapped to each REG. The resource element RE occupied by the reference signal RS is not included in the REG. Thus, the number of REGs within a given OFDM symbol depends on the presence of RS. The REG concept is also used for other DL control channels (ie, PCFICH and PHICH). The DCI format and the number of DCI bits are determined according to the number of CCEs.

CCEs are numbered consecutively, and to simplify the decoding process, a PDCCH having a format consisting of n CCEs can only start with a CCE having a number corresponding to a multiple of n. The number of CCEs used for transmission of a specific PDCCH, that is, the CCE aggregation level is determined by the BS according to the " channel " state. For example, one CCE may be sufficient for a PDCCH for a UE having a good DL channel (eg, adjacent to a BS). However, in case of a PDCCH for a UE having a poor channel (eg, near the cell boundary), eight CCEs may be required to obtain sufficient robustness.

Referring to FIG. 6, a UL subframe may be divided into a control region and a data region in the frequency domain. One or several physical uplink control channels (PUCCHs) may be allocated to the control region to carry uplink control information (UCI). One or several PUSCHs (physical uplink shared channel) may be allocated to the data region of the UL subframe to carry user data. The control region and the data region in the UL subframe may also be called a PUCCH region and a PUSCH region, respectively. A sounding reference signal (SRS) may be allocated to the data area. The SRS is transmitted in the OFDM symbol located at the end of the UL subframe in the time domain and in the data transmission band of the UL subframe, that is, in the data domain, in the frequency domain. SRSs of several UEs transmitted / received in the last OFDM symbol of the same subframe may be distinguished according to frequency location / sequence.

When the UE adopts the SC-FDMA scheme for UL transmission, in order to maintain a single carrier characteristic, in the 3GPP LTE release 8 or release 9 system, PUCCH and PUSCH cannot be simultaneously transmitted on one carrier. In 3GPP LTE Release 10 system, whether to support simultaneous transmission of PUCCH and PUSCH may be indicated in a higher layer.

In the UL subframe, subcarriers having a long distance based on a direct current (DC) subcarrier are used as a control region. In other words, subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of uplink control information. The DC subcarrier is a component that is not used for signal transmission and is mapped to a carrier frequency f ₀ during frequency upconversion. The PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency in one subframe, and the RBs belonging to the RB pair occupy different subcarriers in two slots. The PUCCH allocated in this way is expressed as that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, if frequency hopping is not applied, RB pairs occupy the same subcarrier.

Hereinafter, a new radio access technology (new RAT) will be described. The new radio access technology may be abbreviated as NR (new radio).

As more communication devices demand larger communication capacities, there is a need for improved mobile broadband communication as compared to conventional radio access technology (RAT). Massive Machine Type Communications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communication. In addition, communication system design considering services / terminals that are sensitive to reliability and latency has been discussed. The introduction of next-generation wireless access technologies in consideration of such extended mobile broadband communication, massive MTC, Ultra-Reliable and Low Latency Communication (URLLC), and the like are discussed in the present invention for convenience. Is called new RAT or NR.

Referring to FIG. 7, the NG-RAN may include a gNB and / or an eNB providing a user plane and a control plane protocol termination to the terminal. 7 illustrates a case of including only gNB. The gNB and the eNB are connected to each other by an Xn interface. The gNB and eNB are connected to a 5G Core Network (5GC) through an NG interface. More specifically, the access and mobility management function (AMF) is connected through the NG-C interface, and the user plane function (UPF) is connected through the NG-U interface.

8 illustrates the functional division between NG-RAN and 5GC.

Referring to FIG. 8, the gNB may configure inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control, radio admission control, and measurement setup and provision. (Measurement configuration & provision), dynamic resource allocation, and the like can be provided. AMF can provide functions such as NAS security, idle state mobility handling, and the like. The UPF may provide functions such as mobility anchoring and PDU processing. The Session Management Function (SMF) may provide functions such as terminal IP address allocation and PDU session control.

<Self-contained <Self-contained subframesubframe structure> structure>

In order to minimize latency in the fifth generation NR, a structure in which a control channel and a data channel are TDM may be considered as one of the frame structures as shown below. That is, in the fifth generation NR, a self-contained subframe structure is considered in order to minimize data transmission latency in a TDD system.

According to FIG. 9, as an example of a frame structure, one subframe (where a subframe may have a name interchangeable with a transmission time interval (TTI)) may be an index and a symbol of a resource block (RB). It can be expressed based on the index of. In this case, one TTI may include an area related to a downlink control channel, an area related to an uplink control channel, and a downlink or uplink area.

For example, when the TTI structure is described based on FIG. 6, the hatched area represents a downlink control area, and the black part represents an uplink control area. An area without an indication may be used for downlink data transmission or may be used for uplink data transmission. The feature of this structure is that downlink (DL) transmission and uplink (UL) transmission are sequentially performed in one subframe, and DL data is transmitted in a subframe. You can also get ack / nack (Acknowledged / Not Acknowledged). As a result, when the data transmission error occurs, it takes less time to retransmit data, thereby minimizing the latency of the final data transmission.

In the data and control TDMed subframe structure (i.e., this self-contained subframe structure), the base station and the UE transition from transmission mode to reception mode or transmission mode from reception mode. A time gap is needed for the conversion process. To this end, some OFDM symbols at the time of switching from DL to UL in a subframe structure are set to a guard period (GP).

<Analog <Analog beamformingbeamforming >>

In mmW, the wavelength is shortened, allowing multiple antennas to be installed in the same area. That is, in the 30 GHz band, a wavelength of 1 cm can be installed in a panel of 5 by 5 cm in total of 100 antenna elements in a 2-dimension array at 0.5 lambda intervals. Therefore, in mmW, a plurality of antenna elements are used to increase beamforming (BF) gain to increase coverage or to increase throughput.

In this case, if a TXRU (transceiver unit) is provided to enable transmission power and phase adjustment for each antenna element, independent beamforming is possible for each frequency resource. However, in order to install TXRU in all 100 antenna elements, there is a problem in terms of cost effectiveness. Therefore, a method of mapping a plurality of antenna elements to one TXRU and adjusting the direction of the beam with an analog phase shifter is considered. The analog beamforming method has a disadvantage in that only one beam direction can be made in the entire band and thus frequency selective beaming cannot be performed.

A hybrid BF having B TXRUs, which is smaller than Q antenna elements in an intermediate form between digital BF and analog BF, may be considered. In this case, although there are differences depending on the connection scheme of the B TXRU and the Q antenna elements, the direction of the beam that can be transmitted simultaneously is limited to B or less.

In the present invention, for convenience of description, the proposed scheme will be described based on the new RAT (NR) system. However, in addition to the new RAT system, the range of the system to which the proposed method is applied can be extended to other systems such as 3GPP LTE / LTE-A system.

For better understanding of the description below, reference may be made to 3GPP TS 38 series (38.211, 38.212, 38.213, 38.214, 38.331, etc.).

<< NRNR 프레임 구조 및 물리 자원> Frame Structure and Physical Resources>

In the NR system, downlink (DL) and uplink (UL) transmission is performed through frames having a duration of 10 ms, and each frame includes 10 subframes. Thus, one subframe corresponds to 1 ms. Each frame is divided into two half-frames.

One ^subframe is N _symb ^{subframe, μ} = N _symb ^slot XN _slot ^{subframe, μ} consecutive OFDM symbols are included. N _symb ^slot denotes the number of symbols per ^slot , μ denotes an OFDM neumology, and N _slot ^{subframe, μ} denotes the number of slots per ^subframe for the corresponding μ. In NR, multiple OFDM numerologies as shown in Table 1 may be supported.

TABLE 1

In Table 1, Δf means subcarrier spacing (SCS). Μ and CP (cyclic prefix) for the DL carrier bandwidth part (BWP) and μ and cyclic prefix (CP) for the UL carrier bandwidth part (BWP) may be configured in the terminal through uplink signaling.

Table 2 shows the number of symbols per ^slot (N _symb ^slot ), the number of slots per frame (N _slot ^{frame, μ} ), and the number of slots per ^subframe (N _slot ^{subframe, μ} ) for each SCS.

TABLE 2

Table 3 shows the number of symbols per ^slot (N _symb ^slot ), the number of slots per frame (N _slot ^{frame, μ} ), and the number of slots per ^subframe (N _slot ^{subframe, μ} ) for each extended _CS .

TABLE 3

As described above, in the NR system, the number of slots configuring one subframe may be changed according to subcarrier spacing (SCS). The OFDM symbols included in each slot may correspond to any one of D (DL), U (UL), and X (flexible). DL transmission may be performed in D or X symbols, and UL transmission may be performed in U or X symbols. The X (flexible) symbol may be denoted as 'F'.

One resource block (RB) in NR corresponds to 12 subcarriers in the frequency domain. The RB may include a plurality of OFDM symbols. RE (resource element) corresponds to one subcarrier and one OFDM symbol. Thus, there are 12 REs on one OFDM symbol in one RB.

The carrier BWP may be defined as a set of contiguous physical resource blocks (PRBs). The carrier BWP may be referred to simply as BWP. Up to four BWPs may be configured for each uplink / downlink in one UE. Even if multiple BWPs are set, one BWP is activated for a given time. However, when the supplementary uplink (SUL) is configured in the terminal, four additional BWPs may be configured for the SUL, and one BWP may be activated for a given time. The UE is not expected to receive a PDSCH, a PDCCH, a channel state information-reference signal (CSI-RS) or a tracking reference signal (TRS) outside the activated DL BWP. In addition, the UE is not expected to receive the PUSCH or the PUCCH beyond the activated UL BWP.

The slot format may be configured in various ways according to a combination of D, U, and / or X symbols constituting the slot. For example, the network may configure various slot format combinations in the terminal through higher layer signaling, and indicate at least one of the slot format combinations configured in the terminal through a PDCCH (eg, DCI format 2-0) common to the terminal group. Can be.

Table 4 is an example of various slot formats for Normal CP.

TABLE 4

In Table 4, D means a downlink symbol, U means an uplink symbol, and F means a flexible symbol.

For convenience of explanation, the slot format will be described based on Table 4 below. For example, in the case of slot format 0, this may mean that all symbols (ie, symbols 0 to 13) existing in one slot are downlink symbols. Also, for example, in case of slot format 1, it may mean that all symbols existing in one slot are uplink symbols. As another example, in case of slot format 55, symbol 0, symbol 1, symbols 8 through 13 may be downlink symbols, symbols 2 through 4 may be flexible symbols, and symbols 5 through 7 may be uplink symbols.

The motivation for the invention is described below.

One potential technology that will enable future cellular network deployment scenarios and applications is the support of wireless backhaul and relay links, allowing flexible and very dense deployment of NR cells without the need for densification in proportion to the transport network.

In NR, with the basic deployment of massive MIMO or multi-beam systems, the expected bandwidth available for NR compared to LTE (e.g. mmWave spectrum) provides the opportunity to develop and deploy integrated access and backhaul links. This may allow for easy deployment of dense networks of self-backhauled NR cells in a more integrated manner by establishing multiple control and data channels / procedures defined to provide access to the UE. have.

An example of such a network with integrated access and backhaul links is shown in FIG. 10, where a relay node rTRP may multiplex access and backhaul links in time, frequency or space (eg, beam based operations).

The operation of the different links can be at the same or different frequencies (also referred to as 'in-band' and 'out-band' relays). Efficient support of out-of-band relays is important in some NR deployment scenarios, but understands in-band operating requirements, which means close interaction with access links operating at the same frequency to accommodate duplex constraints and prevent / mitigate interference. It is very important to.

In addition, operating an NR system in the mmWave spectrum is a serious problem that may not be easily mitigated by current RRC-based handover mechanisms due to the larger time scale required to complete the procedure compared to short term blocking. Several unique challenges can be presented, including experiencing short term blocking.

Overcoming short-term interruptions in mmWave systems may require a fast RAN-based mechanism (not necessarily core network intervention) to switch between rTRPs.

The need to mitigate short-term blocking of NR operation in the mmWave spectrum, along with the need for easier placement of self-backhauled NR cells, has led to the development of an integrated framework that enables rapid switching of access and backhaul links. May cause a need.

In addition, over-the-air coordination between rTRPs can be considered to mitigate interference and support end-to-end route selection and optimization.

The following requirements and aspects may need to be addressed by integrated access to the NR and wireless backhaul (IAB).

Efficient and flexible operation for in-band and out-of-band relay in indoor and outdoor scenarios

Multi-hop and redundant connections

End-to-end route selection and optimization

High spectral efficiency supports backhaul links

Legacy NR UE support

Legacy new RATs are designed to support half-duplex devices. In addition, the half duplex of the IAB scenario is supported and worthy of targeting. Also, a full duplex IAB device can be studied.

In an IAB scenario, if each relay node (RN) does not have scheduling capability, the donor gNB (DgNB) must schedule the entire link between the DgNB, the associated RN and the UEs. In other words, the DgNB may collect traffic information from all relevant RNs to make schedule decisions for all links and then inform the schedule information to each RN.

11 schematically illustrates an example of a link between a DgNB, RN, and a UE.

According to FIG. 11, for example, the link between the DgNB and the UE1 is an access link (access link), the link between the RN1 and the UE2 may also mean the access link, and the link between the RN2 and the UE3 may also mean the access link.

Similarly, according to FIG. 11, for example, a link between the DgNB and the RN1 and a link between the RN1 and the RN2 may mean a backhaul link.

For example, as in the example of FIG. 11, a backhaul and an access link may be configured, in which case, the DgNB may not only receive a scheduling request of UE1 but also receive a scheduling request of UE2 and UE3. Thereafter, scheduling decisions for the two backhaul links and the three access links may be made and the scheduling result may be informed. Thus, this central scheduling involves delay scheduling and latency issues.

On the other hand, distributed scheduling may be performed if each RN has scheduling capability. This enables immediate scheduling for uplink scheduling requests from the UE, and allows backhaul / access links to be more flexible to reflect the surrounding traffic conditions.

이하, 본 발명에 대해 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

In order to transmit HARQ-ACK for a PDSCH received by an IAB node operating in half-duplex, the following operation is required.

Switching from downlink to uplink

Timing alignment from downlink timing to uplink timing

In the above process, a gap time is required to switch from DL to UL. Accordingly, whenever the IAB node transmits HARQ-ACK for the PDSCH, resource waste occurs.

Meanwhile, the contents of the present invention are described assuming an in-band environment, but may be applied to an out-band environment.

Further, the subject matter of the present invention is described in consideration of an environment in which a donor gNB (DgNB), a relay node (RN), and / or a UE performs half duplex operation, but a donor gNB (DgNB), a relay node ( RN), and / or the UE may also be applied in an environment in which full-duplex operation is performed.

For convenience of description, in the present invention, when RN1 and RN2 exist, when RN1 is connected by a backhaul link with RN2 to relay data transmitted / received from RN2, RN1 is called a parent node of RN2. can do. In addition, in the above case, RN2 may be called a child node of RN1.

In the present invention, the operation of the IAB node is generally proposed, but the present invention may be applied to a case where general RNs, gNBs, and UEs receive data and transmit HARQ-ACK. In addition, although the present invention mainly proposes HARQ-ACK transmission for PDSCH, the same principle may be applied to A / N transmission for PUSCH.

Hereinafter, when a specific node receives a plurality of PDSCHs, how the specific node will poll HARQ-ACKs generated for each of the plurality of received PDSCHs, and the specific node transmits a polled HARQ-ACK. In this case, it will be described with reference to which resource (and / or when) to transmit the polled HARQ-ACK.

According to FIG. 12, the first node may receive a plurality of PDSCHs (S1210). Here, for the convenience of description of the present invention, although the first node receives a plurality of PDSCHs, the case where the first node receives only a single PDSCH or the first node does not receive the PDSCH is also described below. As such, it is included in embodiments of the present invention.

Here, the first node and the second node may be an integrated access and backhaul (IAB) node. In addition, the first node may be a child node, and the second node may be a parent node. Here, the first node and the second node may be connected by a backhaul link.

In addition, hereinafter, for convenience of description, a child node or a parent node may be described as being mixed with an IAB node.

Thereafter, the first node may transmit the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource (S1220). In this case, the polled HARQ-ACK information may include a plurality of HARQ-ACK information for each of the plurality of PDSCHs.

Hereinafter, for the detailed description of FIG. 12, a method of transmitting the polled HARQ-ACK to the second node by each item is divided into respective items to be described in more detail.

A. A. HARQHARQ -- ACKACK 전송 시점 Transmission point

First, the present invention proposes a method for notifying whether polling is performed and a method for notifying a time point for transmitting a polled HARQ-ACK. One of the following methods may be used alone, or several methods may be used in combination.

Meanwhile, the specific resource may be periodically present, wherein the polled HARQ-ACK information transmitted on the specific resource is between a transmission point of previous polled HARQ-ACK information and a transmission point of upcoming polled HARQ-ACK information. It may include the plurality of HARQ-ACK information for each of the plurality of PDSCH received. Hereinafter, the present content will be described in more detail.

(a) 주기적(Periodic) (a) Periodic HARQHARQ -- ACKACK 전송 send

A resource capable of transmitting HARQ-ACK may exist periodically.

As illustrated in FIG. 13, a parent node may transmit at least one PDSCH to a child node. Referring to the example of FIG. 13, a child node may transmit, for example, HARQ-ACK 131 for two PDSCHs to a parent node at a first time point. In addition, the child node may transmit, for example, HARQ-ACK 132 for four PDSCHs to the parent node at the second time point. Similarly, the child node may transmit, for example, HARQ-ACK 131 for one PDSCH to the parent node at the third time point.

As illustrated in FIG. 13, HARQ-ACK information about PDSCHs received before the time of transmitting the next HARQ-ACK after transmitting the HARQ-ACK may be collected and transmitted at the corresponding time.

For example, when the HARQ-ACK transmission time is slot #n and the HARQ-ACK period is P, the child node may transmit HARQ-ACK information on the PDSCH transmitted in slots #nPk to slot # nk. Gather and transmit to the parent node in slot #n.

More specifically, when the HARQ-ACK transmission period is a P slot, and HARQ-ACK is transmitted in slot #n, the child node is HARQ-ACK for PDSCHs transmitted during slot # nP-α ~ slot # n-α Send information to the parent node in slot #n.

In this case, the value α is a value for guaranteeing the minimum time required for the IAB node to generate HARQ-ACK information after receiving the PDSCH. The value is fixed to a specific value and is defined in the specification or semi-fixed by RRC. It can be configured as (semi-static). In addition, the α value may be different for each IAB node, and the value may be transmitted to the parent nodes.

Period and / or offset information for the time point at which HARQ-ACK can be transmitted may be semi-fixedly set to the IAB node through RRC.

In this case, when the HARQ-ACK transmission period indicates a specific value (e.g., 0 msec / 0 slot), this may mean that the IAB node does not perform HARQ-ACK polling. Alternatively, HARQ-ACK polling may be separately configured through the RRC to the IAB node.

If there is no PDSCH received at the time of HARQ-ACK transmission and there is no HARQ-ACK to transmit, the IAB node may 1) not transmit HARQ-ACK or 2) transmit NACK.

If the corresponding time resource is not set to UL at the time of HARQ-ACK transmission, the IAB node may operate as follows.

Method 1. Drop without performing transmission of HARQ-ACK information.

Method 2. HARQ-ACK polling is performed until the next HARQ-ACK transmission time.

More specifically, like the SP-CSI, the polled HARQ-ACK transmission may be configured semi-persistent based on the PUCCH or PUSCH. At this time, the CSI and the HARQ-ACK may be distinguished through a separate RNTI from the SP-CSI. In the case where two (CSI and HARQ-ACK) overlap, if the IAB node can piggyback both CSI and HARQ-ACK, it is assumed that both IAB nodes will be put on the (parent) IAB node. can do.

That is, the IAB node may transmit the polled HARQ-ACK to the PUCCH through activation by MAC CE or the PUSCH by activation using DCI. In this case, if there is no HARQ-ACK (unlike SP-CSI), PUCCH or PUSCH may be skipped.

(b) 비주기적((b) aperiodic ( AperiodicAperiodic ) ) HARQHARQ -- ACKACK 전송 send

A resource capable of transmitting HARQ-ACK may exist aperiodically, and upon receiving a HARQ-ACK request message, the IAB node may transmit a polled HARQ-ACK. In this case, the IAB node collects HARQ-ACK information on PDSCHs received after transmitting the previous HARQ-ACK and before the next HARQ-ACK, and at that time (the time of transmitting the next HARQ-ACK). send.

More specifically, when the HARQ-ACK request message is received in slot #m, the IAB node may perform polled HARQ-ACK transmission for the request in slot #n (n> m). In addition, when receiving a HARQ-ACK request message in slot #m ', the IAB node may perform polled HARQ-ACK transmission for the request in slot #n' (n '> m').

In this case, when HARQ-ACK is transmitted in slot #n and then HARQ-ACK is transmitted in slot #n '(where n <n'), the IAB node performs slot # n-α to slot #n. HARQ-ACK information on PDSCHs transmitted during '-α is transmitted in slot #n'. Alternatively, when the HARQ-ACK request message is received in the slot #m and the next HARQ-ACK request message is received in the slot #m ', the IAB node transmits the PDSCH transmitted during the slots # m-β to slot # m'-β. HARQ-ACK information is transmitted in slot #n '.

In this case, the value α is a value for guaranteeing the minimum time required for the IAB node to generate HARQ-ACK information after receiving the PDSCH, and is fixed to a specific value and defined in the specification or semi-fixed by RRC. Can be. In addition, the β value may be fixed to a specific value and defined in the specification, or may be set semi-fixed by the RRC.

In this case, an indication of whether to perform HARQ-ACK polling may be semi-fixedly set to the IAB node through RRC.

Meanwhile, the first node may transmit the polled HARQ-ACK information to the second node based on down control information (DCI). Hereinafter, the present content will be described in more detail.

(c) DL (c) DL DCIDCI 지시 indication

Transmission of the polled HARQ-ACK may be indicated through the DL DCI. More specifically, the following is proposed.

Method 1.

It may be indicated whether to immediately transmit or poll the HARQ-ACK in a DL grant that schedules the PDSCH. If HARQ-ACK polling is indicated, poll the transmission of HARQ-ACK; if HARQ-ACK transmission is indicated, HARQ-ACKs previously polled are performed together with HARQ-ACK information for the PDSCH transmitted by the corresponding DL grant. send.

In this case, whether HARQ-ACK polling may be indicated through an explicit field in the DCI.

Alternatively, whether HARQ-ACK polling may be implicitly indicated through the ARI field. If the ARI field indicates a specific value, this may mean that the HARQ-ACK is polled.

Or, HARQ-ACK polling can be implicitly indicated through the DAI field. The DAI field may indicate an index of the PDSCH for polling. If the DAI field is a specific value, it may mean that the polled HARQ-ACKs are transmitted without performing polling anymore.

2.Method 2.

DL DCI for HARQ-ACK transmission may exist separately. The DL DCI is transmitted for the purpose of indicating transmission of a polled HARQ-ACK, and the IAB node monitors the corresponding UL DCI in all or part of the PDCCH search space. All or part of the following information may be indicated to the UL DCI.

Whether to send polled HARQ-ACK: Instructs transmission of HARQ-ACK information on which polling has been performed.

PDSCH information to transmit HARQ-ACK: When only HARQ-ACK information for some PDSCHs is transmitted, it indicates which PDSCH to transmit HARQ-ACK.

Upon receiving this UL DCI, the UE transmits HARQ-ACK using the PUCCH.

3.Method 3.

In more detail, in Method 1 and Method 2, the HARQ-ACK time resource and the ARI applied to the DCI may be configured as an RRC. Alternatively, one may be specified in advance. The designation method may use an offset for an absolute slot used in an access link and a method of giving an HARQ-ACK resource in an slot as an ARI, or use a time resource as an HARQ-ACK from the last symbol of a PDSCH. It is possible to count the possible time resources and to stamp the frequency domain resources in the corresponding time-resource with ARI.

For example, several time resources may exist for the UL capable of HARQ-ACK transmission, and may indicate which one of these time resources is to perform the actual HARQ-ACK transmission. The HARQ-ACK transmittable time-resource can be defined as follows.

The time-resource is determined based on the start OFDM symbol of the PUCCH resource (s) capable of transmitting HARQ-ACK.

Set slots including PUCCH resource (s) capable of transmitting HARQ-ACK as time-resource.

Determine non-overlapping durations (ie, one or a few OFDM symbols) of PUCCH (resources) transmitting HARQ-ACK as time-resources

(d) UL (d) UL DCIDCI 지시 indication

Transmission of the polled HARQ-ACK may be indicated through the UL DCI. More specifically, the following is proposed.

Method 1.

Transmission of the polled HARQ-ACK may be indicated through the DCI scheduling the PUSCH. In this case, when the IAB node is scheduled to transmit the PUSCH, the IAB node is instructed to transmit the polled HARQ-ACK. When the IAB node is instructed to transmit the PUSCH, the IAB node transmits the PUSCH and the HARQ-ACK at the same time or piggybacks the HARQ-ACK information on the PUSCH.

More specifically, whether HARQ-ACK polling may be indicated through an explicit field in the DCI.

Alternatively, HARQ-ACK polling may be implicitly indicated through the CSI request field. If the CSI request field indicates a specific value or does not request CSI transmission, this may mean that a polled HARQ-ACK is transmitted.

2.Method 2.

There may be a separate UL DCI for HARQ-ACK transmission. The UL DCI is transmitted for the purpose of indicating transmission of a polled HARQ-ACK, and the IAB node may monitor the corresponding UL DCI in all or part of the PDCCH search space. All or part of the following information may be indicated to the UL DCI.

Whether to transmit polled HARQ-ACK: Instructs transmission of HARQ-ACK information on which polling has been performed.

PDSCH information to transmit HARQ-ACK: When only HARQ-ACK information of some PDSCHs is transmitted, it indicates which PDSCH HARQ-ACK is to be transmitted.

Upon receiving this UL DCI, the UE transmits HARQ-ACK using the PUSCH.

3. Method 3:

HARQ-ACK may be triggered using an AP-CSI without UL-SCH trigger. For example, if without UL-SCH is indicated in the situation that AP-CSI is not triggered can be recognized as HARQ-ACK without UL-SCH. If both AP-CSI and without UL-SCH are triggered, it may be HARQ-ACK and CSI. This may be similarly applied to a case where a separate field for HARQ-ACK transmission is provided.

Meanwhile, the first node may transmit the polled HARQ-ACK information at a time point of transmitting an uplink message different from the polled HARQ-ACK information.

At this time, the transmission time of the other uplink message is the time when the transmission of the Physical Uplink Shared Channel (PUSCH) is allowed, the time when the transmission of the scheduling request (SR), or the transmission of the Sounding Reference Signal (SRS) is allowed It may be a time point, a time point at which transmission of a physical random access channel (PRACH) is allowed, or a time point at which transmission of channel state information (CSI) feeedback is allowed. Hereinafter, the present content will be described in more detail.

(e) UL 타이밍에서 (e) at UL timing HARQHARQ -- ACKACK 전송 send

Rather than performing UL transmission to transmit only HARQ-ACK for the PDSCH in the IAB environment, it may be efficient to transmit the same together when the IAB node makes another UL transmission to the parent node to transmit the HARQ-ACK. To this end, it is proposed to transmit HARQ-ACK for the PDSCH at the following time. HARQ-ACK transmission may be performed at one or several of the following time points.

Method 1.

HARQ-ACK may be transmitted at the time when the PUSCH is set to be transmitted. In one example, this may be limited to a grant-free PUSCH (type 1 or type 2). When the PUSCH is not transmitted at the time of transmitting the HARQ-ACK for the PDSCH, the HARQ-ACK transmission is delayed or polled to transmit the HARQ-ACK for the PDSCH at the closest PUSCH transmission time. In this case, HARQ-ACK information may be piggybacked and transmitted on the PUSCH or transmitted on the PUCCH.

2.Method 2.

HARQ-ACK may be transmitted at the time when the SR is set to be transmitted or when the SR is transmitted. If the time to transmit the HARQ-ACK for the PDSCH is not set to transmit the SR or the time to transmit the SR, the time or SR set to transmit the nearest SR by delaying or polling the HARQ-ACK transmission. HARQ-ACK is transmitted at the time of transmission.

3.Method 3.

HARQ-ACK may be transmitted at the time of transmitting the SRS. If the time to transmit the HARQ-ACK for the PDSCH is not the time to transmit the SRS, HARQ-ACK transmission is delayed or polled to transmit the HARQ-ACK at the closest SRS transmission time.

4.Method 4.

HARQ-ACK may be transmitted at the time of transmitting the PRACH. More specifically, the HARQ-ACK is transmitted when the PRACH is transmitted in the beam direction in which the HARQ-ACK is to be transmitted. If the time point for transmitting the HARQ-ACK for the PDSCH is not the time point for transmitting the corresponding PRACH, the HARQ-ACK transmission is delayed or polled to transmit the HARQ-ACK at the closest PRACH transmission time.

5.Method 5.

HARQ-ACK may be transmitted at the time of transmitting the CSI feedback. Such CSI feedback may mean periodic CSI feedback and / or aperiodic CSI feedback. If the time to transmit the HARQ-ACK for the PDSCH is not the time to transmit the CSI feedback, HARQ-ACK transmission is delayed or polled to transmit the HARQ-ACK at the closest CSI feedback transmission time.

More specifically, in a multi-beam environment, it is assumed that only a configuration having a beam direction that matches the beam direction (different by SRI or other setting) to which HARQ-ACK should be transmitted is valid. For example, when the SR is configured for several beams, the beam direction (TX beam direction) may mean that only resources in which the HARQ-ACK and the SR match are assumed to be used as resources of the HARQ-ACK.

In addition, when using CSI transmission resources to configure CSI resources (eg, P-CSI, SP-CSI on PUCCH, SP-CSI on PUSCH, AP-CSI report setting), HARQ-ACK is transmitted together with CSI report setting. It can be configured whether to send separately or separately. In case of being configured to perform HARQ-ACK transmission, it may be assumed that HARQ-ACK transmission is simultaneously performed on the corresponding CSI resource.

Meanwhile, when the received values of the plurality of PDSCHs reach a preset value, the first node may transmit the polled HARQ-ACK information.

In this case, the preset value may be a value related to the amount of HARQ-ACK information that the first node can poll. For example, the preset value may include a maximum number of HARQ-ACKs, a number related to a maximum codeword for transmitting HARQ-ACKs, a maximum number of transmission blocks for transmitting HARQ-ACKs, a maximum number of PDSCHs for transmitting HARQ-ACKs, It may be a value of a maximum downlink assignment index (DAI) for transmitting HARQ-ACK, or a value related to a value set from an upper layer. This will be described in more detail below.

(f) 최대 (f) maximum HARQHARQ -- ACKACK 폴링Polling 양에 도달하면 전송 Transfer when the quantity is reached

When the maximum amount of HARQ-ACK that can be polled is M, if the maximum amount is accumulated, HARQ-ACK is transmitted. When the PDSCH is received, when the maximum amount of HARQ-ACK that can be polled is reached by adding the previously polled HARQ-ACK and the HARQ-ACK information on the received PDSCH, the HARQ-ACK is transmitted without further polling.

These M values are 1) the maximum number of bits of HARQ-ACK, 2) the maximum number of codewords or codeword groups that transmit HARQ-ACK, and 3) the maximum number of transmission blocks that transmit HARQ-ACK. (transport block) number, 4) maximum number of PDSCHs transmitting HARQ-ACK, 5) value of maximum DAI (Counter-DAI and / or Total-DAI) transmitting HARQ-ACK, or 6) higher layer- layer) can mean the value set.

(g) 반 고정적 UL 슬롯에서만 (g) only in semi-fixed UL slots HARQHARQ -- ACKACK 전송 send

According to the cell-specific and / or UE-specific semi-static configuration, the HARQ-ACK may be transmitted at a time point at which the UL node may be performed to the parent node.

Characteristically, if the time point for transmitting the HARQ-ACK is not the UL transmission time determined by the semi-fixed configuration, the IAB node may transmit the HARQ-ACK at the closest UL transmission time by delaying the HARQ-ACK transmission.

Alternatively, when the PDSCH is received in slot #n and then HARQ-ACK is transmitted in slot # n + k, the value of k is set from the parent node. In this case, only the slots fixed semi-fixedly can be used for counting k, not for all slots. In other words, after receiving the PDSCH in the slot #n, HARQ-ACK for it can be transmitted in the k-th UL slot (in this case, the UL slot is semi-fixed set) after the slot #n.

The specific resource may be at least one of an uplink slot, a channel state information (CSI) transmission resource, a scheduling request (SR) transmission resource, a physical random access channel (PRACH) transmission resource, or a semi-fixed uplink slot. Hereinafter, the content thereof will be described in more detail.

Combining (e) and (g) of the case, the resource to be used for HARQ-ACK transmission of the various resources can be set based on the following list (for example). One of the following lists may be applied as a resource to be used for HARQ-ACK transmission or a plurality of cases may be used as a resource to be used for HARQ-ACK transmission.

-All slots (limited to UL slots but can count all slots to determine HARQ-ACK time)

UL slot, CSI resource, SR resource, PRACH resource (slot can be used semi-statically designated slot, or slots and resources including CSI / SR / PRACH)

-CSI transmission resource only

-SR transmission resource only

UL slot + PRACH transmission resource

Semi-fixed UL slot only

-Etc

For example, when using an SR resource as a HARQ-ACK transmission resource, it can be interpreted that the HARQ-ACK transmission resource is an SR resource in the figure of FIG. The HARQ-ACK period may be interpreted as an SR transmission period.

At this time, if there is an SR resource in slot #n and the SR transmission period is P, HARQ-ACK information for the PDSCH transmitted in slots # n-P-k to slots # n-k may be transmitted in slot # n.

At this time, if ACK / NACK information for all PDSCH is characteristically ACK, HARQ-ACK may not be transmitted. When ACK / NACK information for at least one PDSCH is NACK, one bit of NACK may be transmitted.

When the NACK is transmitted, the parent node may retransmit all related PDSCHs (PDSCH transmitted in slots # n-P-k to slots # n-k when HARQ-ACK information is received in slot #n).

The HARQ-ACK transmission method may be applied even when the HARQ-ACK transmission resource is another resource other than the SR resource.

More generally, for a resource K that can be used as a HARQ-ACK transmission resource, a set of slots that are not included in a HARQ-ACK resource earlier than K among PDSCHs earlier than K2 based on the slot including K is identified as {DL HARQ. -ACK assoc} set for K.

HARQ-ACK is transmitted only when a NACK occurs for PDSCH transmission in a corresponding slot, and an operation of retransmitting all scheduled data in a slot applied when a corresponding case occurs may be assumed.

B. B. 폴링된Polled HARQHARQ -- ACKACK 생성 방법 Generation method

When the HARQ-ACK is transmitted by polling, HARQ-ACK information for several PDSCHs are transmitted at the same time. In this section, we propose a method of collecting, collecting, and transmitting bits of HARQ-ACK information.

First, all HARQ-ACK information to be transmitted in one way may be collected and transmitted at the same time. For example, when the number of PDSCHs to be transmitted is N and the number of HARQ-ACK bits per PDSCH is C, HARQ-ACK is transmitted by concatenating them and using N * C bits.

For example, when polling and transmitting HARQ-ACK for PDSCH1 and PDSCH2 received at different time points, HARQ-ACK value for PDSCH1 is {A, A, A, A} and HARQ-ACK value for PDSCH2. When the {A, A, N, N}, the polled HARQ-ACK information may be {A, A, A, A, A, A, A, N, N}. (A: ACK, N: NACK)

In this case, if the number of HARQ-ACKs that can be transmitted (or the maximum number of codebooks, codebook groups, transport blocks, PDSCHs, or C-DAI / T-DAIs) can be operated as follows.

1) transmit the polled HARQ-ACK.

2) After that, the HARQ-ACK for the received PDSCH is dropped without further polling.

3) Perform TB based A / N transmission. (The specific method is described in the next section.)

In particular, when HARQ-ACK polling is applied, the C-DAI value transmitted to the DL grant may be increased according to the order of PDSCH to which HARQ-ACK polling is applied. In addition, the total number of PDSCHs to which HARQ-ACK polling is applied until the PDSCH is transmitted may be indicated in the T-DAI value transmitted to the DL grant.

Alternatively, TB-based A / N transmission can be performed to reduce the number of A / N bits to be transmitted. The IAB node generates A / N in units of TB for the plurality of received PDSCHs and transmits corresponding A / N information.

Even in this case, since HARQ-ACK polling cannot be performed for an infinite PDSCH, the number of PDSCHs or TBs capable of performing maximum polling may be limited. When the number of PDSCHs or TBs capable of polling at maximum is G, the PDSCHs or TBs are divided into G groups. At this time, the n th PDSCH or TB may belong to the n% G group.

A / N information on PDSCH or TB belonging to the same group is bundled and represented by one or a plurality of bits. For example, A / N information about PDSCH or TB belonging to the same group may correspond to this. If all are ACK, it is represented by one ACK, and if there is any NACK, it can be represented by NACK.

In this case, the value of G may be set by a higher layer, or may be equal to the value of the maximum T-DAI or the number of CBGs set with the value X of the maximum T-DAI.

C. C. PUCCHPUCCH A/N A / N 리소스resource

PUCCH resources for transmitting the polled HARQ-ACK may be determined as follows.

Method 1. Among the PDSCHs that perform HARQ-ACK polling, the ARI value indicated by the DCI scheduling the last received PDSCH is followed.

Method 2. Semi-statically determined through RRC setting.

Method 3. Among the PDSCHs that have performed HARQ-ACK polling, a plurality of PUCCH resources are used from an ARI value indicated by the DCI scheduling the last received PDSCH.

D. D. HARQHARQ -- ACKACK 폴링Polling 여부의 지시 Instruction of whether or not

Whether HARQ-ACK polling can be set semi-fixed via RRC.

In particular, HARQ-ACK polling may be set for each PDCCH search space. At this time, the HARQ-ACK for the PDSCH transmitted in the search space to which HARQ-ACK polling is applied is transmitted by applying polling, and the HARQ-ACK for the PDSCH transmitted to the search space to which HARQ-ACK polling is not applied is polled. HARQ-ACK is immediately transmitted at a predetermined timing without applying.

Alternatively, whether HARQ-ACK polling may be dynamically set through DCI.

If HARQ-ACK polling is indicated, polling is performed without transmitting HARQ-ACK immediately.

If it is indicated not to poll the HARQ-ACK, 1) transmits the polled HARQ-ACK together with the corresponding HARQ-ACK. Or 2) apart from HARQ-ACKs performing polling, the HARQ-ACK for the corresponding PDSCH is immediately and independently transmitted at a predetermined timing.

E. E. 폴링된Polled HARQHARQ -- ACK과ACK and 즉시(immediate) Immediate HARQHARQ -- ACK의ACK's 병렬 동작(parallel operation) Parallel operation

Depending on the situation of the data to be transmitted or the type of application, the latency required for data transmission may vary. In this case, some PDSCHs perform HARQ-ACK polling, but some PDSCHs may not perform HARQ-ACK polling. In general, HARQ-ACK for a PDSCH is transmitted by applying polling, but HARQ-ACK for a specific PDSCH may be immediately transmitted.

For this operation, the IAB node can operate in parallel with the transmission of the polled HARQ-ACK and the immediate transmission of the HARQ-ACK. For example, a PDSCH that does not apply HARQ-ACK polling transmits HARQ-ACK immediately at a predetermined timing, and a PDSCH to which HARQ-ACK polling is applied is polled HARQ-ACK using the proposed HARQ-ACK polling method. HARQ-ACK may be transmitted at the time of transmission.

More specifically, the following methods can be proposed.

Method 1.

The PDSCH to which the polled HARQ-ACK transmission is applied and the PDSCH to which the immediate HARQ-ACK transmission is applied may be semi-fixed through RRC.

Characteristically, such setting may be performed for each PDCCH search space, and thus, whether or not the polled HARQ-ACK / immediate HARQ-ACK may be determined according to the location of the PDCCH search space in which the DCI in which the PDSCH is set is transmitted.

2.Method 2.

The PDSCH to which the polled HARQ-ACK transmission is applied is semi-fixedly configured through the RRC, and the PDSCH to which the HARQ-ACK transmission is applied immediately may be dynamically configured through the DCI.

Characteristically, if HARQ-ACK transmission polled through RRC is not configured, HARQ-ACK transmission is assumed immediately for all PDSCHs. If the HARQ-ACK transmission polled through the RRC is configured, HARQ-ACK is immediately applied to the PDSCH configured for immediate HARQ-ACK transmission through the DCI, and HARQ-ACK polled to the PDSCH is applied to the remaining PDSCHs.

3.Method 3.

The PDSCH to which the polled HARQ-ACK transmission is applied and the PDSCH to which the immediate HARQ-ACK transmission is applied are dynamically configured through DCI.

More specifically, when a polled and immediate HARQ-ACK collides on the same resource, the codebook generation may be configured by encoding the two separately or immediately after the codebook for the HARQ-ACK codebook for the polled HARQ-ACK to beta-offset. The number of bits can be appended accordingly. More generally polled HARQ-ACK can be dropped according to the availability (availability) of the resource.

F. F. PUSCHPUSCH 전송 제약 Transport constraints

When an IAB node sends HARQ-ACK for a PDSCH received in half-duplex operation, at least two operations (e.g., downlink to uplink and uplink timing and timing) are performed. Sorting operations).

In general, when D / U or U / D switching occurs, it is necessary to set a gap for switching. This means that more HARQ-ACKs are transmitted for the received PDSCH, which also means that more switching gaps are needed. In other words, the timing gap prevents more resources from being used. In particular, due to the high subcarrier spacing, the required gap may be larger than one OFDM symbol.

Thus, considering the above, frequent DL / UL switching may not be desirable.

In the case of multiple beams, when a node transmits HARQ-ACK to its parent node, the node cannot receive a signal from another node, and the node may also be directed in a beam direction other than the beam carrying HARQ-ACK information. There is no signal transmission.

In addition, other child nodes may receive signals only from the specific beam direction used by their parent node for HARQ-ACK transmission.

Because there are many links (eg, access DL / UL, backhaul DL / UL with parent node, backhaul DL / UL with child node, etc.) in the IAB scenario, many fragmented DL or UL such as frequent PUCCH transmissions Transmission is somewhat inefficient.

Accordingly, it may be important to multiplex UL channels as much as possible. This is important in the IAB scenario compared to the other examples where scheduling decisions occur locally in each IAB for the child IAB nodes (of each IAB node).

For example, the backhaul UL to the parent IAB and the access DL for the UEs are shared to allow different cross-link TDMs in different beam directions (because the best beam for each link can be different), or backhaul UL to the parent IAB. And if the backhaul to the child IAB is shared to allow different cross-link TDM in different beam directions (because the best beam for each link can be different), it is desirable to reduce the number of supported beams for one case. can do. Otherwise, the time may be very long to support many beams in one UL time, or a long latency may occur to support a particular beam.

Accordingly, in order to reduce unnecessary DL / UL switching and fragmented beams for transmitting different channels in the TDM scheme, the following approach may be considered.

Reduce HARQ-ACK transmission or at least multiplex multiple UL channels if possible

Reduce UL grant overhead to schedule PUSCH

In order to reduce reserved but unused resources, PUSCH transmission can be transmitted to all UL slots / symbol (s) by dynamic UL grant, so implicitly reserves UL slot (s) / symbol (s). similar to the one you reserve.

In this case, it may be a schedule in the PUSCH, so that a corresponding resource may not be allocated to a child node or a terminal thereof, and when the resource is free, a UL grant cannot come to the resource (ie, a corresponding slot). For UL only if no UL grant came before the k1 slot.

This means that if the K1 value is very small (eg 1 slot), it becomes very rare to become available to other resources. [

Therefore, it may be necessary to reserve resources for PUSCH scheduling in advance and to assume that PUSCH grant can occur only in the reserved resources.

It is possible to set a resource to be used as a UL for each backhaul link separately, or to reserve a UL resource with the set grant in advance and grant a grant for the corresponding resource in the form of confirmation.

For example, if an IAB node is configured with a corresponding resource, the IAB node may assume that a PUSCH UL grant may not come except for the corresponding resource. Under such assumptions, resources that are not configured can be allocated to other children / UEs.

Hereinafter, the invention for the transmission of HARQ-ACK information described so far will be described in terms of the first node and the second node through the drawings.

According to FIG. 14, the first node may receive a plurality of PDSCHs (S1410). Here, since a specific example in which the first node receives the plurality of PDSCHs is as described above, repeated description of overlapping descriptions will be omitted for convenience of description.

Thereafter, the first node may transmit the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource (S1420). In this case, the polled HARQ-ACK information may include a plurality of HARQ-ACK information for each of the plurality of PDSCHs. Here, a specific example in which the first node transmits the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource is as described above, and thus, repeated description of overlapping descriptions for convenience of description. Is omitted.

According to FIG. 15, the processor 1500 may include a PDSCH receiver 1510 and a HARQ-ACK transmitter 1520. Here, the processor 1500 may mean a processor in a wireless communication device to be described later.

The PDSCH receiver 1510 may be configured to receive a plurality of PDSCHs. Here, since a specific example in which the first node receives the plurality of PDSCHs is as described above, repeated description of overlapping descriptions will be omitted for convenience of description.

Thereafter, the HARQ-ACK transmitter 1520 may be configured to transmit the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource. In this case, the polled HARQ-ACK information may include a plurality of HARQ-ACK information for each of the plurality of PDSCHs. Here, a specific example in which the first node transmits the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource is as described above, and thus, repeated description of overlapping descriptions for convenience of description. Is omitted.

According to FIG. 16, the second node may transmit a plurality of PDSCHs (S1610). Here, since a specific example in which the first node receives the plurality of PDSCHs is as described above, repeated description of overlapping descriptions will be omitted for convenience of description.

Thereafter, the second node may receive the polled HARQ-ACK information for the plurality of PDSCHs from the first node on a specific resource (S1620). In this case, the polled HARQ-ACK information may include a plurality of HARQ-ACK information for each of the plurality of PDSCHs. Here, a specific example in which the first node transmits the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource is as described above, and thus, repeated description of overlapping descriptions for convenience of description. Is omitted.

According to FIG. 17, the processor 1700 may include a PDSCH transmitter 1710 and a HARQ-ACK receiver 1720. Here, the processor 1700 may mean a processor in a wireless communication device to be described later.

The PDSCH transmitter 1710 may be configured to transmit a plurality of PDSCHs. Here, since a specific example in which the first node receives the plurality of PDSCHs is as described above, repeated description of overlapping descriptions will be omitted for convenience of description.

Thereafter, the HARQ-ACK receiver 1720 may be configured to receive the polled HARQ-ACK information for the plurality of PDSCHs from the first node on a specific resource. In this case, the polled HARQ-ACK information may include a plurality of HARQ-ACK information for each of the plurality of PDSCHs. Here, a specific example in which the first node transmits the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource is as described above, and thus, repeated description of overlapping descriptions for convenience of description. Is omitted.

The UE 600 includes a processor 610, a memory 620, and a transceiver 630. Processor 610 may be configured to implement the proposed functions, procedures, and / or methods described herein. Layers of the air interface protocol may be implemented in the processor 610.

More specifically, the processor 610 may include the information receiver 1510 and the monitoring performer 1520 described above.

The information receiver 1510 may be configured to receive information related to monitoring from a network (eg, a base station). For example, the information related to the monitoring may refer to information related to reducing a range of a target to be monitored by the terminal.

Here, since a detailed description of the terminal receiving information related to monitoring from a network (for example, a base station) is as described above, repeated description of overlapping contents will be omitted for convenience of description.

The monitoring execution unit 1520 may be set to perform monitoring based on the information related to the monitoring.

Here, the detailed description of the terminal performing the monitoring based on the information related to the monitoring is the same as described above, so that repeated description of overlapping contents will be omitted for convenience of description.

The memory 620 is operatively coupled with the processor 610 and stores various information for operating the processor 610. The transceiver 630 is operatively coupled with the processor 610 and transmits and / or receives a radio signal.

The processor 610 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The memory 620 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device. The transceiver 630 may include a baseband circuit for processing radio frequency signals. When an embodiment is implemented in software, the techniques described herein may be implemented as modules (eg, procedures, functions, etc.) that perform the functions described herein. The module may be stored in the memory 620 and executed by the processor 610. The memory 620 may be implemented inside the processor 610. Alternatively, the memory 620 may be implemented outside the processor 610 and communicatively connected to the processor 610 through various means known in the art.

The present invention described above with respect to the UE side can be applied to this embodiment.

The UE includes a processor 610, a power management module 611, a battery 612, a display 613, a keypad 614, a subscriber identification module (SIM) card 615, a memory 620, a transceiver 630. , One or more antennas 631, speakers 640, and microphones 641.

Processor 610 may be configured to implement the proposed functions, procedures, and / or methods described herein. Layers of the air interface protocol may be implemented in the processor 610. The processor 610 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The processor may be an application processor (AP). The processor 610 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). Examples of the processor 610 is a SNAPDRAGON manufactured by Qualcomm ^® ^TM series processor, a EXYNOS manufactured by Samsung ^® ^TM series processor, Apple ^® on the A Series processor, MediaTek ^® the HELIO ^TM series processor made by made by, It may be an ATOM ^™ series processor manufactured by INTEL ^® or a corresponding next generation processor.

The power management module 611 manages power of the processor 610 and / or the transceiver 630. The battery 612 supplies power to the power management module 611. The display 613 outputs the result processed by the processor 610. Keypad 614 receives input to be used by processor 610. Keypad 614 may be displayed on display 613. SIM card 615 is an integrated circuit used to securely store an international mobile subscriber identity (IMSI) and its associated keys used to identify and authenticate subscribers in mobile phone devices such as mobile phones and computers. You can also store contact information on many SIM cards.

The memory 620 is operatively coupled with the processor 610 and stores various information for operating the processor 610. The memory 620 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device. When an embodiment is implemented in software, the techniques described herein may be implemented as modules (eg, procedures, functions, etc.) that perform the functions described herein. The module may be stored in the memory 620 and executed by the processor 610. The memory 620 may be implemented inside the processor 610. Alternatively, the memory 620 may be implemented outside the processor 610 and communicatively connected to the processor 610 through various means known in the art.

The transceiver 630 is operatively coupled with the processor 610 and transmits and / or receives a radio signal. The transceiver 630 includes a transmitter and a receiver. The transceiver 630 may include a baseband circuit for processing radio frequency signals. The transceiver controls one or more antennas 631 to transmit and / or receive wireless signals.

The speaker 640 outputs a sound related result processed by the processor 610. The microphone 641 receives a sound related input to be used by the processor 610.

20 illustrates a network node implementing an embodiment of the invention.

The present invention described above on the network side can be applied to this embodiment.

The network node 800 includes a processor 810, a memory 820, and a transceiver 830. Processor 810 may be configured to implement the proposed functions, procedures, and / or methods described herein. Layers of the air interface protocol may be implemented in the processor 810.

In this case, when the processor 810 is the processor 1500 of the first node, the processor 810 may include a PDSCH receiver 1510 and a HARQ-ACK transmitter 1520.

Here, when the processor 810 is the processor 1700 in the second node, the processor 810 may include a PDSCH transmitter 1710 and a HARQ-ACK receiver 1720. Here, the processor 1700 may mean a processor in a wireless communication device to be described later.

The memory 820 is operably coupled to the processor 810 and stores various information for operating the processor 810. The transceiver 830 is operatively coupled with the processor 810 and transmits and / or receives a radio signal.

The processor 810 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The memory 820 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device. The transceiver 830 may include a baseband circuit for processing radio frequency signals. When an embodiment is implemented in software, the techniques described herein may be implemented as modules (eg, procedures, functions, etc.) that perform the functions described herein. The module may be stored in the memory 820 and executed by the processor 810. The memory 820 may be implemented inside the processor 810. Alternatively, the memory 820 may be implemented outside the processor 810 and may be communicatively connected to the processor 810 through various means known in the art.

21 illustrates an example of a signal processing module structure in a transmission device. Here, signal processing may be performed in a processor of a base station / terminal, such as the processor of FIGS. 18 to 20.

Referring to FIG. 21, a transmission device 1810 in a terminal or a base station includes a scrambler 301, a modulator 302, a layer mapper 303, an antenna port mapper 304, a resource block mapper 305, and a signal generator 306. ) May be included.

The transmitting device 1810 may transmit one or more codewords. The coded bits in each codeword are scrambled by the scrambler 301 and transmitted on the physical channel. The codeword may be referred to as a data string and may be equivalent to a transport block which is a data block provided by the MAC layer.

The scrambled bits are modulated into complex-valued modulation symbols by the modulator 302. The modulator 302 may modulate the scrambled bits according to a modulation scheme and place them as complex modulation symbols representing positions on signal constellations. There is no restriction on a modulation scheme, and m-Phase Shift Keying (m-PSK) or m-Quadrature Amplitude Modulation (m-QAM) may be used to modulate the encoded data. The modulator may be referred to as a modulation mapper.

The complex modulation symbol may be mapped to one or more transport layers by a layer mapper 303. Complex modulation symbols on each layer may be mapped by antenna port mapper 304 for transmission on the antenna port.

The resource block mapper 305 may map the complex modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission. The resource block mapper may map the virtual resource block to a physical resource block according to an appropriate mapping scheme. The resource block mapper 305 may assign a complex modulation symbol for each antenna port to an appropriate subcarrier and multiplex according to a user.

The signal generator 306 modulates a complex modulation symbol for each antenna port, that is, an antenna specific symbol by a specific modulation scheme, for example, an orthogonal frequency division multiplexing (OFDM) scheme, thereby complex-valued time domain. An OFDM symbol signal can be generated. The signal generator may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed. The OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like. The signal generator may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

22 illustrates another example of a signal processing module structure in a transmission device. Here, signal processing may be performed in the processor of the terminal / base station of FIGS. 18 to 21.

Referring to FIG. 22, a transmission device 1810 in a terminal or a base station includes a scrambler 401, a modulator 402, a layer mapper 403, a precoder 404, a resource block mapper 405, and a signal generator 406. It may include.

The transmitting device 1810 may scramble the coded bits in the codeword by the scrambler 401 and transmit the coded bits in one codeword through a physical channel.

The scrambled bits are modulated into complex modulation symbols by modulator 402. The modulator may be arranged as a complex modulation symbol representing a position on a signal constellation by modulating the scrambled bit according to a predetermined modulation scheme. The modulation scheme is not limited, and pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), or m-Quadrature Amplitude Modulation (m-QAM) It can be used for modulation of the encoded data.

The complex modulation symbol may be mapped to one or more transport layers by the layer mapper 403.

Complex modulation symbols on each layer may be precoded by the precoder 404 for transmission on the antenna port. Here, the precoder may perform precoding after performing transform precoding on the complex modulation symbol. Alternatively, the precoder may perform precoding without performing transform precoding. The precoder 404 may process the complex modulation symbol in a MIMO scheme according to a multiplexing antenna to output antenna specific symbols and distribute the antenna specific symbols to the corresponding resource block mapper 405. The output z of the precoder 404 can be obtained by multiplying the output y of the layer mapper 403 by a precoding matrix W of N × M. Where N is the number of antenna ports and M is the number of layers.

The resource block mapper 405 maps the demodulation modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission.

The RB mapper 405 may assign a complex modulation symbol to an appropriate subcarrier and multiplex it according to a user.

The signal generator 406 may generate a complex-valued time domain (OFDM) orthogonal frequency division multiplexing (OFDM) symbol signal by modulating the complex modulation symbol in a specific modulation scheme, for example, the OFDM scheme. The signal generator 406 may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed. The OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like. The signal generator 406 may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

The signal processing of the receiver 1820 may be configured as the inverse of the signal processing of the transmitter. In detail, the processor 1821 of the receiver 1820 performs decoding and demodulation on the radio signal received through the antenna port (s) of the transceiver 1822 from the outside. The receiving device 1820 may include a plurality of multiple receiving antennas, and each signal received through the receiving antenna is restored to a baseband signal, and then transmitted by the transmitting device 1810 through multiplexing and MIMO demodulation. The data sequence is restored. The receiver 1820 may include a signal recoverer for restoring a received signal to a baseband signal, a multiplexer for combining and multiplexing the received processed signal, and a channel demodulator for demodulating the multiplexed signal sequence with a corresponding codeword. . The signal reconstructor, multiplexer, and channel demodulator may be composed of one integrated module or each independent module for performing their functions. More specifically, the signal reconstructor is an analog-to-digital converter (ADC) for converting an analog signal into a digital signal, a CP canceller for removing a CP from the digital signal, and a fast fourier transform (FFT) to the signal from which the CP is removed. FFT module for outputting a frequency domain symbol by applying a, and may include a resource element demapper (equalizer) to restore the frequency domain symbol to an antenna-specific symbol (equalizer). The antenna specific symbol is restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword that the transmitting device intends to transmit by a channel demodulator.

Embodiments of the present invention described above may be applied in the following situations.

The 5G usage scenario shown in FIG. 23 is merely exemplary, and the technical features of the present invention may be applied to other 5G usage scenarios not shown in FIG. 23.

Referring to FIG. 23, three major requirement areas of 5G are: (1) enhanced mobile broadband (eMBB) area, (2) massive machine type communication (mMTC) area, and ( 3) ultra-reliable and low latency communications (URLLC). Some use cases may require multiple areas for optimization, while other use cases may focus on only one key performance indicator (KPI). 5G supports these various use cases in a flexible and reliable way.

eMBB focuses on improving data rate, latency, user density, overall capacity and coverage of mobile broadband access. eMBB aims at throughput of around 10Gbps. eMBB goes far beyond basic mobile Internet access and covers media and entertainment applications in rich interactive work, cloud or augmented reality. Data is one of the key drivers of 5G and may not see dedicated voice services for the first time in the 5G era. In 5G, voice is expected to be treated as an application simply using the data connection provided by the communication system. The main reason for the increased traffic volume is the increase in content size and the increase in the number of applications requiring high data rates. Streaming services (audio and video), interactive video, and mobile Internet connections will become more popular as more devices connect to the Internet. Many such applications require always-on connectivity to push real-time information and notifications to the user. Cloud storage and applications are growing rapidly in mobile communication platforms, which can be applied to both work and entertainment. Cloud storage is a special use case that drives the growth of uplink data rates. 5G is also used for remote tasks in the cloud and requires much lower end-to-end delays to maintain a good user experience when tactile interfaces are used. In entertainment, for example, cloud gaming and video streaming are another key factor in increasing the need for mobile broadband capabilities. Entertainment is essential in smartphones and tablets anywhere, including in high mobility environments such as trains, cars and airplanes. Another use case is augmented reality and information retrieval for entertainment. Here, augmented reality requires very low latency and instantaneous amount of data.

The mMTC is designed to enable communication between a large number of low-cost devices powered by batteries and to support applications such as smart metering, logistics, field and body sensors. The mMTC targets 10 years of battery and / or about 1 million devices per km ² . The mMTC enables seamless connection of embedded sensors in all applications and is one of the most anticipated 5G use cases. Potentially, 2020 IoT devices are expected to reach 20 billion. Industrial IoT is one of the areas where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

URLLC enables devices and machines to communicate very reliably and with very low latency and high availability, making them ideal for vehicle communications, industrial control, factory automation, telesurgery, smart grid and public safety applications. URLLC aims for a delay of around 1ms. URLLC includes new services that will transform the industry through ultra-reliable / low latency links, such as remote control of key infrastructure and autonomous vehicles. The level of reliability and latency is essential for smart grid control, industrial automation, robotics, drone control and coordination.

Next, a plurality of usage examples included in the triangle of FIG. 23 will be described in more detail.

5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of providing streams that are rated at hundreds of megabits per second to gigabits per second. This high speed may be required to deliver TVs at resolutions of 4K or higher (6K, 8K and higher) as well as virtual reality (VR) and augmented reality (AR). VR and AR applications include nearly immersive sports events. Certain applications may require special network settings. For example, in a VR game, the game company may need to integrate the core server with the network operator's edge network server to minimize latency.

Automotive is expected to be an important new driver for 5G, with many uses for mobile communications to vehicles. For example, entertainment for passengers demands both high capacity and high mobile broadband at the same time. This is because future users continue to expect high quality connections regardless of their location and speed. Another use of the automotive sector is augmented reality dashboards. The augmented reality contrast board allows the driver to identify objects in the dark above what they are looking through through the front window. The augmented reality dashboard superimposes information that tells the driver about the distance and movement of the object. In the future, wireless modules enable communication between vehicles, the exchange of information between the vehicle and the supporting infrastructure, and the exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians). The safety system guides alternative courses of action to help drivers drive safer, reducing the risk of an accident. The next step will be a remote controlled vehicle or an autonomous vehicle. This requires very reliable and very fast communication between different autonomous vehicles and / or between cars and infrastructure. In the future, autonomous vehicles will perform all driving activities and allow drivers to focus on traffic anomalies that the vehicle itself cannot identify. The technical requirements of autonomous vehicles require ultra-low latency and ultrafast reliability to increase traffic safety to an unachievable level.

Smart cities and smart homes, referred to as smart societies, will be embedded into high-density wireless sensor networks. The distributed network of intelligent sensors will identify the conditions for cost and energy efficient maintenance of the city or home. Similar settings can be made for each hypothesis. Temperature sensors, window and heating controllers, burglar alarms and appliances are all connected wirelessly. Many of these sensors typically require low data rates, low power and low cost. However, for example, real time HD video may be required in certain types of devices for surveillance.

The consumption and distribution of energy, including heat or gas, is highly decentralized, requiring automated control of distributed sensor networks. Smart grids interconnect these sensors using digital information and communication technologies to gather information and act accordingly. This information can include the behavior of suppliers and consumers, allowing smart grids to improve the distribution of fuels such as electricity in efficiency, reliability, economics, sustainability of production, and in an automated manner. Smart Grid can be viewed as another sensor network with low latency.

The health sector has many applications that can benefit from mobile communications. The communication system can support telemedicine, providing clinical care at a distance. This can help reduce barriers to distance and improve access to health services that are not consistently available in remote rural areas. It is also used to save lives in critical care and emergencies. Mobile communication based wireless sensor networks may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing the cable with a reconfigurable wireless link is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operate with cable-like delay, reliability, and capacity, and that management is simplified. Low latency and very low error probability are new requirements that need to be connected in 5G.

Logistics and freight tracking is an important use case for mobile communications that enables the tracking of inventory and packages from anywhere using a location-based information system. The use of logistics and freight tracking typically requires low data rates but requires wide range and reliable location information.

Meanwhile, the above-described apparatus includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV). ), AI (Artificial Intelligence) module, robot, Augmented Reality (AR) device, VR (Virtual Reality) device, Mixed Reality (MR) device, hologram device, public safety device, MTC device, IoT device, medical device, fintech Devices (or financial devices), security devices, climate / environment devices, devices related to 5G services, or other devices related to the fourth industrial revolution field.

For example, the terminal may be a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet. It may include a tablet PC, an ultrabook, a wearable device (eg, a smartwatch, a glass glass, a head mounted display), and the like. . For example, the HMD may be a display device worn on the head. For example, the HMD can be used to implement VR, AR or MR.

For example, a drone may be a vehicle in which humans fly by radio control signals. For example, the VR device may include a device that implements an object or a background of a virtual world. For example, the AR device may include a device that connects and implements an object or a background of the virtual world to an object or a background of the real world. For example, the MR device may include a device that fuses and implements an object or a background of the virtual world to an object or a background of the real world. For example, the hologram device may include a device that records and reproduces stereoscopic information to realize a 360 degree stereoscopic image by utilizing interference of light generated by two laser lights, called holography, to meet each other. For example, the public safety device may include an image relay device or an image device wearable on a human body of a user. For example, the MTC device and the IoT device may be devices that do not require direct human intervention or manipulation. For example, the MTC device and the IoT device may include a smart meter, a bending machine, a thermometer, a smart bulb, a door lock or various sensors. For example, the medical device may be a device used for the purpose of diagnosing, treating, alleviating, treating or preventing a disease. For example, a medical device may be a device used for the purpose of diagnosing, treating, alleviating or correcting an injury or disorder. For example, a medical device can be a device used for the purpose of inspecting, replacing, or modifying a structure or function. For example, the medical device may be a device used for controlling pregnancy. For example, the medical device may include a medical device, a surgical device, an (in vitro) diagnostic device, a hearing aid or a surgical device, and the like. For example, the security device may be a device installed to prevent a risk that may occur and to maintain safety. For example, the security device may be a camera, a CCTV, a recorder or a black box. For example, the fintech device may be a device capable of providing a financial service such as mobile payment. For example, the fintech device may include a payment device or a point of sales (POS). For example, the climate / environmental device may include a device that monitors or predicts the climate / environment.

Embodiments of the present invention described above may also be applied to the following description.

<인공 지능(AI: Artificial Intelligence)>Artificial Intelligence (AI)

Artificial intelligence refers to the field of researching artificial intelligence or the methodology that can produce it, and machine learning refers to the field of researching methodologies to define and solve various problems dealt with in the field of artificial intelligence. do. Machine learning is defined as an algorithm that improves the performance of a task through a consistent experience with a task.

Artificial Neural Network (ANN) is a model used in machine learning, and may refer to an overall problem-solving model composed of artificial neurons (nodes) networked by synapses. The artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process of updating model parameters, and an activation function generating an output value.

The artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and the artificial neural network may include synapses that connect neurons to neurons. In an artificial neural network, each neuron may output a function value of an active function for input signals, weights, and deflections input through a synapse.

The model parameter refers to a parameter determined through learning and includes weights of synaptic connections and deflection of neurons. In addition, the hyperparameter means a parameter to be set before learning in the machine learning algorithm, and includes a learning rate, the number of iterations, a mini batch size, an initialization function, and the like.

The purpose of learning artificial neural networks can be seen as determining model parameters that minimize the loss function. The loss function can be used as an index for determining an optimal model parameter in the learning process of an artificial neural network.

Machine learning can be categorized into supervised learning, unsupervised learning, and reinforcement learning.

Supervised learning refers to a method of learning artificial neural networks with a given label for training data, and a label indicates a correct answer (or result value) that the artificial neural network must infer when the training data is input to the artificial neural network. Can mean. Unsupervised learning may refer to a method of training artificial neural networks in a state where a label for training data is not given. Reinforcement learning can mean a learning method that allows an agent defined in an environment to learn to choose an action or sequence of actions that maximizes cumulative reward in each state.

Machine learning, which is implemented as a deep neural network (DNN) including a plurality of hidden layers among artificial neural networks, is called deep learning (Deep Learning), which is part of machine learning. Hereinafter, machine learning is used to mean deep learning.

<로봇(Robot)><Robot>

A robot can mean a machine that automatically handles or operates a given task by its own ability. In particular, a robot having a function of recognizing the environment, judging itself, and performing an operation may be referred to as an intelligent robot.

Robots can be classified into industrial, medical, household, military, etc. according to the purpose or field of use.

The robot may include a driving unit including an actuator or a motor to perform various physical operations such as moving a robot joint. In addition, the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and can travel on the ground or fly in the air through the driving unit.

<자율 주행(Self-Driving, Autonomous-Driving)>Self-Driving, Autonomous-Driving

Autonomous driving means a technology that drives by itself, and an autonomous vehicle means a vehicle that runs without a user's manipulation or with minimal manipulation of a user.

For example, in autonomous driving, the technology of maintaining a driving lane, the technology of automatically adjusting speed such as adaptive cruise control, the technology of automatically driving along a predetermined route, the technology of automatically setting a route when a destination is set, etc. All of these may be included.

The vehicle includes a vehicle having only an internal combustion engine, a hybrid vehicle having both an internal combustion engine and an electric motor together, and an electric vehicle having only an electric motor, and may include not only automobiles but also trains and motorcycles.

In this case, the autonomous vehicle may be viewed as a robot having an autonomous driving function.

<확장 현실(<Extended reality ( XRXR : : eXtendedeXtended Reality)> Reality)>

Extended reality collectively refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides real world objects and backgrounds only in CG images, AR technology provides virtual CG images on real objects images, and MR technology mixes and combines virtual objects in the real world. Graphic technology.

MR technology is similar to AR technology in that it shows both real and virtual objects. However, in AR technology, virtual objects are used as complementary objects to real objects, whereas in MR technology, virtual objects and real objects are used in an equivalent nature.

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phone, tablet PC, laptop, desktop, TV, digital signage, etc. It can be called.

Finally, the claims described herein may be combined in various ways. For example, the technical features of the method claims of the present specification may be implemented in a device, and the technical features of the device claims of the present specification may be implemented in a method. In addition, the technical features of the method claims of the present specification and the technical features of the device claims may be implemented as a device, and the technical features of the method claims of the present specification and the technical features of the device claims may be implemented in a method.

Claims

A method for transmitting polled Hybrid Automatic Repeat Request ACK (HARQ-ACK) information performed by a first node in a wireless communication system,

Receive a plurality of Physical Downlink Shared Channels (PDSCHs) from a second node; And

Transmitting the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource;

The polled HARQ-ACK information includes a plurality of HARQ-ACK information for each of the plurality of PDSCH.
2. The method of claim 1, wherein the first node and the second node are integrated access and backhaul (IAB) nodes.
3. The method of claim 2, wherein the first node is a child node and the second node is a parent node.
The method of claim 2, wherein the first node and the second node are connected by a backhaul link.
The method of claim 1, wherein the specific resource periodically exists,

The polled HARQ-ACK information transmitted on the specific resource is the plurality of HARQ-s for each of the plurality of PDSCHs received between the transmission time of previous polled HARQ-ACK information and the transmission time of upcoming polled HARQ-ACK information. And ACK information.
The method of claim 1, wherein the first node transmits the polled HARQ-ACK information to the second node based on down control information (DCI).
The method of claim 1, wherein the first node transmits the polled HARQ-ACK information at a transmission time of an uplink message different from the polled HARQ-ACK information.
8. The method of claim 7, wherein the transmission time of the other uplink message is a time when transmission of a physical uplink shared channel (PUSCH) is allowed, a time when transmission of a scheduling request (SR) is allowed, or a sounding reference signal (SRS) The method is characterized in that the transmission is allowed, the transmission of the Physical Random Access Channel (PRACH) is allowed, or the transmission of the Channel State Information (CSI) feeedback.
The method of claim 1, wherein when the received values of the plurality of PDSCHs reach a preset value, the first node transmits the polled HARQ-ACK information.
The method of claim 9, wherein the predetermined value is a value related to an amount of HARQ-ACK information that the first node can poll.
The method of claim 10, wherein the preset value is a maximum number of HARQ-ACKs, a number related to a maximum codeword for transmitting HARQ-ACKs, a maximum number of transmission blocks for transmitting HARQ-ACKs, and a maximum number of HARQ-ACKs. And a value related to the number of PDSCHs, a value of a maximum downlink assignment index (DAI) for transmitting HARQ-ACK, or a value set from an upper layer.
The method of claim 1, wherein the specific resource is at least one of an uplink slot, a channel state information (CSI) transmission resource, a scheduling request (SR) transmission resource, a physical random access channel (PRACH) transmission resource, or a semi-fixed uplink slot. Characterized in that the method.
The first node in the wireless communication system,

Memory;

Transceiver; And

A processor operatively coupled to the memory and the transceiver,

Receive a plurality of Physical Downlink Shared Channels (PDSCHs) from a second node; And

Transmitting the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource;

The polled HARQ-ACK information includes a plurality of HARQ-ACK information for each of the plurality of PDSCH.
A processor for a wireless communication device in a wireless communication system,

The processor connects the wireless communication device,

Receive a plurality of Physical Downlink Shared Channels (PDSCHs) from a second node; And

Transmitting the polled HARQ-ACK information for the plurality of PDSCHs to the second node on a specific resource;

The polled HARQ-ACK information includes a plurality of HARQ-ACK information for each of the plurality of PDSCH.