WO2020091558A1 - Method for transmitting and receiving signals in wireless communication system and device therefor - Google Patents

Abstract

The present invention relates to a method for receiving a downlink signal in a wireless communication system, and a device therefor. More particularly, the present invention relates to: a method comprising a step for receiving downlink control information (DCI) in a search space for multiple transport block scheduling, and a step for receiving a transport block on the basis of the received DCI, wherein the relative positions of the search space for the multiple transport block scheduling and the transport block are set so as to be fixed; and a device for the method.

Description

Method for transmitting and receiving signal in wireless communication system and apparatus therefor

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving signals in a wireless communication system supporting multiple transport block scheduling.

Mobile communication systems have been developed to provide voice services while ensuring user mobility. However, the mobile communication system has expanded not only to voice but also to data services, and now, due to the explosive increase in traffic, a shortage of resources is caused and users demand higher speed services, so a more advanced mobile communication system is required. .

The requirements of the next-generation mobile communication system are to support the explosive data traffic, the dramatic increase in the transmission rate per user, the largely increased number of connected devices, the very low end-to-end latency, and high energy efficiency. It should be possible. To this end, dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), and Super Wideband Various technologies such as wideband support and device networking have been studied.

An object of the present invention is to provide a method and an apparatus therefor for efficiently transmitting and receiving signals based on multiple transport block scheduling.

Another object of the present invention is to provide a method and apparatus for effectively resolving a collision between a search space for multiple transport block scheduling and a signal and / or channel of another object.

Another object of the present invention is to provide a method and apparatus for efficiently determining resource allocation of a transport block associated with a search space for scheduling multiple transport blocks.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description. Will be able to.

In a first aspect of the present invention, a method for a user equipment to receive a downlink signal in a wireless communication system is provided, the method being downlink in a search space for multiple transport block scheduling Receiving downlink control information (DCI); And receiving a transport block based on the received DCI, but a relative position between the search space for the multiple transport block scheduling and the transport block may be set to be fixed.

In a second aspect of the present invention, a user equipment configured to receive a signal in a wireless communication system is provided, the terminal comprising: a radio frequency (RF) transceiver; And a processor operatively connected to the RF transceiver, wherein the processor controls the RF transceiver: downlink control information in a search space for multiple transport block scheduling. , DCI), and configured to receive a transport block based on the received DCI, and a relative location between the search space for the multiple transport block scheduling and the transport block may be set to be fixed.

Preferably, information on a relative position between the search space for the multiple transport block scheduling and the transport block may be obtained through the DCI.

Preferably, the terminal may receive configuration information for multiple transport block scheduling, and information about a relative position between the search space for the multiple transport block scheduling and the transport block performs the multiple transport block scheduling. It can be obtained through the setting information for.

Preferably, the relative position between the search space for the multiple transport block scheduling and the transport block may have a predefined value.

Preferably, the relative position between the search space for the multiple transport block scheduling and the transport block may be a relative position between the start position of the search space and the start position of the transport block.

Preferably, the relative position between the search space for the multiple transport block scheduling and the transport block may be a relative position between the end position of the search space and the start position of the transport block.

Preferably, the start position of the transport block may be determined based on a scheduling delay and Rmax specified by the DCI, and Rmax indicates the length of a search space for scheduling a single transport block associated with the transport block. Can be.

More preferably, the start position of the transport block may be determined by adding the value of Rmax to a scheduling delay specified by the DCI.

More preferably, the start position of the transport block may be determined by adding the value of Rmax and the size of a gap to a scheduling delay specified by the DCI.

Preferably, the start position of the transport block may be determined based on a scheduling delay and Rmax specified by the DCI, and Rmax may indicate a length of a search space for scheduling multiple transport blocks.

More preferably, the start position of the transport block may be determined by adding the value of Rmax to a scheduling delay specified by the DCI.

More preferably, the start position of the transport block may be determined by adding the value of Rmax and the size of the gap to the scheduling delay specified by the DCI.

According to the present invention, it is possible to efficiently transmit and receive signals based on multiple transport block scheduling.

And / or, according to the present invention, it is possible to effectively resolve a collision between a search space for multiple transport block scheduling and other target signals and / or channels.

And / or according to the present invention, it is possible to efficiently determine resource allocation of a transport block associated with a search space for multiple transport block scheduling.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

Included as part of the detailed description to aid understanding of the present invention, the accompanying drawings provide embodiments of the present invention and describe the technical features of the present invention together with the detailed description.

1 illustrates physical channels used in a 3GPP system and general signal transmission.

2 illustrates a random access procedure (Random Access Procedure).

3 illustrates an LTE radio frame structure.

4 illustrates a slot structure of an LTE frame.

5 illustrates the structure of a radio frame used in an NR system.

6 illustrates the slot structure of the NR frame.

7 illustrates cell coverage enhancement in MTC.

8 illustrates a signal band for MTC.

9 illustrates scheduling in legacy LTE and MTC.

10 illustrates transmission of an NB-IoT downlink physical channel / signal.

11 illustrates a network initial access and subsequent communication process in the NR system.

12 illustrates preamble transmission in an NB-IoT RACH.

13 illustrates an operation sequence of a UL transmission process and a DL reception process of a terminal supporting a multi-TB scheduling structure.

14 illustrates an operation sequence of a UL reception process and a DL transmission process of a base station supporting a multi-TB scheduling structure.

15 illustrates a process of interoperation between a terminal and a base station.

16 illustrates specific methods in which multi-TB scheduling works.

17 illustrates a method proposed in the present specification.

18 illustrates a search space and a search space candidate.

19 to 25 illustrate methods proposed in the present specification.

26 to 31 illustrate a system and a communication device to which the methods proposed herein can be applied.

In this specification, a downlink (DL) means communication from a base station to a terminal, and an uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station.

The technology described herein can be used in various radio access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. CDMA may be implemented with a radio technology such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) or 5G is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

For clarity, the description is based on a 3GPP communication system (eg, LTE-A, NR), but the technical spirit of the present invention is not limited thereto. LTE means a technology after 3GPP TS (Technical Specification) 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is called LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is called LTE-A pro. 3GPP 5G means the technology after TS 36.xxx Release 15, 3GPP NR means the technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" means standard document detail number. LTE / NR may be referred to as a 3GPP system. Background art, terms, abbreviations, and the like used in the description of the present invention may refer to matters described in a standard document published prior to the present invention. For example, you can refer to the following documents.

3GPP LTE

-36.211: Physical channels and modulation

-36.212: Multiplexing and channel coding

-36.213: Physical layer procedures

-36.300: Overall description

-36.304: User Equipment (UE) procedures in idle mode

-36.331: Radio Resource Control (RRC)

3GPP NR

-38.211: Physical channels and modulation

-38.212: Multiplexing and channel coding

-38.213: Physical layer procedures for control

-38.214: Physical layer procedures for data

-38.300: NR and NG-RAN Overall Description

-38.304: User Equipment (UE) procedures in Idle mode and RRC Inactive state

-36.331: Radio Resource Control (RRC) protocol specification

E-UTRAN (evolved-UMTS terrestrial radio access network) or LTE (long term evolution) / LTE-A / LTE-A Pro / 5G system may be referred to as LTE system. NG-RAN may be referred to as an NR system. User Equipment (UE) may be fixed or mobile, and may be referred to by other terms such as a terminal, a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, and the like. Can be. A base station (BS) is a fixed station that generally communicates with a UE, and other terms such as an evolved node-B (eNB), a general node-B (gNB), a base transceiver system (BTS), and an access point (AP). Can be referred to as

A. Physical channel and frame structure

Physical channel and general signal transmission

1 illustrates physical channels used in a 3GPP system and general signal transmission. In a wireless communication system, a terminal receives information through a downlink (DL) from a base station, and the terminal transmits information through an uplink (UL) to the base station. The information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist according to the type / use of the information they transmit and receive.

When the power is turned off again when the power is turned off, or newly entered the cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S11). To this end, the UE receives the PSS (Primary Synchronization Signal) and the Secondary Synchronization Signal (SSS) from the base station, synchronizes with the base station, and acquires information such as cell identity (cell ID). In addition, the terminal may obtain a PBCH (Physical Broadcast Channel) from the base station to obtain the broadcast information in the cell. In addition, the UE may check a downlink channel state by receiving a DL RS (Downlink Reference Signal) in an initial cell search step.

After completing the initial cell search, the UE may acquire more detailed system information by receiving a physical downlink control channel (PDCCH) and a corresponding physical downlink control channel (PDSCH) (S12).

Thereafter, the terminal may perform a random access procedure (for example, see FIG. 2 and related description) to complete the access to the base station (S13 to S16). Specifically, the UE may transmit a random access preamble through a physical random access channel (PRACH) (S13) and receive a random access response (RAR) for the preamble through a PDCCH and a corresponding PDSCH (S14). Thereafter, the UE may transmit a physical uplink shared channel (PUSCH) using scheduling information in the RAR (S15), and perform a contention resolution procedure such as PDCCH and corresponding PDSCH (S16).

After performing the above-described procedure, the UE may perform PDCCH / PDSCH reception (S17) and PUSCH / PUCCH (Physical Uplink Control Channel) transmission (S18) as general uplink / downlink signal transmission procedures. Control information transmitted by the terminal to the base station is referred to as UCI (Uplink Control Information). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), and the like. CSI includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), and Rank Indication (RI). UCI is generally transmitted through PUCCH, but can be transmitted through PUSCH when control information and data should be simultaneously transmitted. In addition, according to the request / instruction of the network, the UE may periodically transmit UCI through PUSCH.

2 illustrates a random access procedure (Random Access Procedure).

The random access process includes initial access in RRC Idle Mode (or RRC_IDLE state), initial access after radio link failure, handover requesting a random access process, RRC Connected Mode (or RRC_CONNECTED state) ) Is performed when uplink / downlink data requiring a random access process is generated. The random access process may be referred to as RACH (Random Access CHannel) process. Some RRC messages such as RRC Connection Request Message, Cell Update Message, and URA Update Message are also transmitted using a random access process. A logical channel Common Control Channel (CCCH), a Dedicated Control Channel (DCCH), and a Dedicated Traffic Channel (DTCH) may be mapped to the transport channel RACH. The transport channel RACH is mapped to the physical channel Physical Random Access Channel (PRACH). When the MAC layer of the UE instructs the UE physical layer to transmit PRACH, the UE physical layer first selects one access slot and one signature to transmit the PRACH preamble in uplink. The random access process is divided into a contention based process and a non-contention based process.

Referring to FIG. 2, the terminal receives and stores information regarding random access from a base station through system information. Thereafter, if a random access is required, the UE transmits a random access preamble (also referred to as message 1 or Msg1) to the base station (S21). The random access preamble may be referred to as a RACH preamble or PRACH preamble. When the base station receives the random access preamble from the terminal, the base station transmits a random access response message (also referred to as message 2 or Msg2) to the terminal (S22). Specifically, the downlink scheduling information for the random access response message may be CRC masked with RA-RNTI (Random Access-RNTI) and transmitted on an L1 / L2 control channel (PDCCH). The UE receiving the down-scheduling signal masked with RA-RNTI may receive and decode a random access response message from a Physical Downlink Shared Channel (PDSCH). Thereafter, the terminal checks whether there is random access response information directed to the random access response message. Whether the random access response information indicated to the user exists may be confirmed as whether a random access preamble ID (RAID) for the preamble transmitted by the UE exists. The random access response information includes Timing Advance (TA) indicating timing offset information for synchronization, radio resource allocation information used for uplink, and a temporary identifier (eg, Temporary C-RNTI) for terminal identification. do. Upon receiving the random access response information, the UE transmits an uplink including an RRC connection request message as an uplink shared channel according to radio resource allocation information included in the response information (also referred to as message 3 or Msg3). It is performed (S23). After receiving the uplink transmission from the terminal, the base station transmits a message for contention resolution (also referred to as message 4 or Msg4) to the terminal (S24). The message for contention resolution may be referred to as a contention resolution message, and may include an RRC connection establishment message. After receiving the contention resolution message from the base station, the terminal transmits a connection establishment completion message (also called message 5 or Msg5) to the base station after completing the connection establishment (S25).

In the case of the contention-free process, the base station may allocate a non-contention random access preamble to the UE before the UE transmits the random access preamble (S21). The contention-free random access preamble may be allocated through handover command or dedicated signaling such as PDCCH. When the UE is assigned a non-competitive random access preamble, the UE may transmit the allocated non-competitive random access preamble similar to step S21 to the base station. When the base station receives the non-competitive random access preamble from the terminal, similar to step S22, the base station can transmit a random access response to the terminal.

Radio frame structure

3 illustrates an LTE radio frame structure. LTE supports Frame Type 1 for Frequency Division Duplex (FDD), Frame Type 2 for Time Division Duplex (TDD) and Frame Type 3 for Unlicensed Cell (UCell). In addition to the primary cell (PCell), up to 31 secondary cells (SCells) may be aggregated. Unless otherwise specified, the operations described herein can be applied independently for each cell. In multi-cell merging, different frame structures can be used for different cells. Also, time resources (eg, subframes, slots, and subslots) in the frame structure may be collectively referred to as a time unit (TU).

3 (a) illustrates frame type 1. The downlink radio frame is defined as 10 1ms subframes (Subframes, SFs). The subframe includes 14 or 12 symbols depending on the cyclic prefix (CP). When a normal CP is used, the subframe includes 14 symbols. When an extended CP is used, a subframe includes 12 symbols. The symbol may mean an OFDM (A) symbol or an SC-FDM (A) symbol according to multiple access schemes. For example, the symbol may mean an OFDM (A) symbol in the downlink and an SC-FDM (A) symbol in the uplink. The OFDM (A) symbol is referred to as a CP-OFDM (A) (Cyclic Prefix-OFDM (A)) symbol, and the SC-FDM (A) symbol is DFT-s-OFDM (A) (Discrete Fourier Transform-spread-OFDM). (A)) may be referred to as a symbol.

3 (b) illustrates frame type 2. Frame type 2 is composed of two half frames. The half frame includes 4 (or 5) general subframes and 1 (or 0) special subframes. The general subframe is used for uplink or downlink according to UL-DL configuration (Uplink-Downlink Configuration). The subframe consists of two slots.

The structure of the radio frame described above is only an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slot may be variously changed.

4 illustrates a slot structure of an LTE frame.

Referring to FIG. 4, a slot includes a plurality of symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. The symbol also means a symbol period. The structure of the slot may be represented by a resource grid composed of N ^{DL / UL} _RB × N ^RB _sc subcarriers and N ^{DL / UL} _symb symbols. Here, N ^DL _RB indicates the number of RBs in the downlink slot, and N ^UL _RB indicates the number of _RBs in the UL slot. N ^DL _RB and N ^UL _RB depend on the DL bandwidth and the UL bandwidth, respectively. N ^DL _symb represents the number of symbols in the DL slot, and N ^UL _symb represents the number of symbols in the UL slot. N ^RB _sc represents the number of subcarriers constituting RB. The number of symbols in the slot can be variously changed according to the SCS and CP length. For example, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot includes 6 symbols.

RB is defined as N ^{DL / UL} _symb (eg, 7) consecutive symbols in the time domain, and N ^RB _sc (eg, 12) consecutive subcarriers in the frequency domain. Here, RB may mean a physical resource block (PRB) or a virtual resource block (VRB), and PRBs and VRBs may be mapped on a one-to-one basis. Two RBs, one for each of the two slots of the subframe, are called RB pairs. The two RBs constituting the RB pair have the same RB number (or RB index). A resource composed of one symbol and one subcarrier is called a resource element (RE) or tone. Each RE in the resource grid can be uniquely defined by an index pair (k, l) in the slot. k is an index assigned from 0 to N ^{DL / UL} _RB × N ^RB _sc -1 in the frequency domain, and l is an index assigned from 0 to N ^{DL / UL} _symb -1 in the time domain.

Up to three (or four) OFDM (A) symbols located in front of the first slot in a subframe correspond to a control region to which a downlink control channel is allocated. The remaining OFDM (A) symbol corresponds to a data region to which PDSCH is allocated, and the basic resource unit of the data region is RB. The downlink control channel includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), and a physical hybrid ARQ indicator channel (PHICH). The PCFICH is transmitted in the first OFDM symbol of the subframe and carries information about the number of OFDM symbols used for transmission of the control channel in the subframe. PHICH is a response to uplink transmission and carries an HARQ ACK / NACK (acknowledgment / negative-acknowledgment) signal. Control information transmitted through the PDCCH is referred to as Downlink Control Information (DCI). The DCI includes uplink or downlink scheduling information or an uplink transmit power control command for an arbitrary UE group.

The subframe consists of two 0.5ms slots. Each slot is composed of a plurality of symbols, and one symbol corresponds to one SC-FDMA symbol. RB is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain. The structure of the uplink subframe of LTE is largely divided into a data area and a control area. The data area refers to a communication resource used in transmitting data such as voice and packets transmitted to each terminal and includes a physical uplink shared channel (PUSCH). The control region refers to a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each terminal, a reception ACK / NACK for a downlink signal, an uplink scheduling request, and the like, and a PUCCH (Physical Uplink). Control Channel). SRS (Sounding Reference Signal) is transmitted through the SC-FDMA symbol located at the end on the time axis in one subframe.

5 illustrates the structure of a radio frame used in an NR system.

In NR, uplink and downlink transmission are composed of frames. The radio frame has a length of 10 ms, and is defined as two 5 ms half-frames (HFs). The half-frame is defined by five 1ms subframes (Subframe, SF). The subframe is divided into one or more slots, and the number of slots in the subframe depends on SCS (Subcarrier Spacing). Each slot includes 12 or 14 OFDM (A) symbols according to a cyclic prefix (CP). When a normal CP is used, each slot contains 14 symbols. When an extended CP is used, each slot contains 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or DFT-s-OFDM symbol).

Table 1 exemplifies that when a CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS.

* N ^slot _symb : Number of symbols in slot

* N ^{frame, u} _slot : Number of slots in the frame

* N ^{subframe, u} _slot : Number of slots in the ^subframe

Table 2 illustrates that when an extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS.

In an NR system, OFDM (A) numerology (eg, SCS, CP length, etc.) may be set differently among a plurality of cells merged into one UE. Accordingly, a (absolute time) section of a time resource (eg, SF, slot, or TTI) composed of the same number of symbols (for convenience, collectively referred to as a time unit (TU)) may be set differently between merged cells.

6 illustrates the slot structure of the NR frame.

A slot contains multiple symbols in the time domain. For example, in the case of a normal CP, one slot includes 14 symbols, but in the case of an extended CP, one slot includes 12 symbols. The carrier includes a plurality of subcarriers in the frequency domain. Resource block (RB) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain. BWP (Bandwidth Part) is defined as a plurality of contiguous (P) RBs in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.). The carrier may include up to N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated for one terminal. Each element in the resource grid is referred to as a resource element (RE), and one complex symbol may be mapped.

B. Uplink and downlink channels

Downlink channel

The base station transmits the related signal to the terminal through the downlink channel, and the terminal receives the related signal from the base station through the downlink channel.

(1) Physical downlink shared channel (PDSCH)

PDSCH carries downlink data (eg, DL-shared channel transport block, DL-SCH TB), and modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAMK), 64 QAM, and 256 QAM are used. Applies. A codeword is generated by encoding TB. PDSCH can carry up to two codewords. For each codeword, scrambling and modulation mapping are performed, and modulation symbols generated from each codeword are mapped to one or more layers (Layer mapping). Each layer is mapped to a resource together with a DMRS (Demodulation Reference Signal) and is generated as an OFDM symbol signal and transmitted through a corresponding antenna port.

(2) Physical downlink control channel (PDCCH)

The PDCCH carries downlink control information (DCI) and a QPSK modulation method is applied. One PDCCH is composed of 1, 2, 4, 8, and 16 control channel elements (CCEs) according to an aggregation level (AL). One CCE is composed of six Resource Element Groups (REGs). One REG is defined by one OFDM symbol and one (P) RB. The PDCCH is transmitted through a control resource set (CORESET). CORESET is defined as a set of REGs with a given pneumonology (eg, SCS, CP length, etc.). A plurality of CORESETs for one UE may overlap in the time / frequency domain. CORESET may be set through system information (eg, MIB) or UE-specific higher layer (eg, Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of symbols (up to 3) constituting the CORESET may be set by higher layer signaling.

The UE obtains DCI transmitted through the PDCCH by performing decoding (aka blind decoding) on a set of PDCCH candidates. The set of PDCCH candidates that the UE decodes is defined as a set of PDCCH search spaces. The search space set may be a common search space or a UE-specific search space. The UE may obtain DCI by monitoring PDCCH candidates in one or more set of search spaces set by MIB or higher layer signaling. Each CORESET setting is associated with one or more search space sets, and each search space set is associated with one COREST setting. One set of search spaces is determined based on the following parameters.

-controlResourceSetId : represents a control resource set related to the search space set

-monitoringSlotPeriodicityAndOffset : Indicates PDCCH monitoring interval (slot unit) and PDCCH monitoring interval offset (slot unit)

-monitoringSymbolsWithinSlot : indicates the PDCCH monitoring pattern in the slot for PDCCH monitoring (eg, indicates the first symbol (s) of the control resource set)

-nrofCandidates : indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8) by AL = {1, 2, 4, 8, 16}

Table 3 illustrates features by search space type.

Table 4 illustrates DCI formats transmitted on the PDCCH.

DCI format 0_0 is used to schedule TB-based (or TB-level) PUSCH, DCI format 0_1 is TB-based (or TB-level) PUSCH or CBG (Code Block Group) -based (or CBG-level) PUSCH It can be used to schedule. DCI format 1_0 is used to schedule the TB-based (or TB-level) PDSCH, DCI format 1_1 is used to schedule the TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH Can be. DCI format 2_0 is used to deliver dynamic slot format information (eg, dynamic SFI) to the terminal, and DCI format 2_1 is used to deliver downlink pre-Emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 may be delivered to UEs in a corresponding group through a group common PDCCH (PDCCH), which is a PDCCH delivered to UEs defined as one group.

Uplink channel

The terminal transmits the related signal to the base station through the uplink channel, and the base station receives the related signal from the terminal through the uplink channel.

(1) Physical uplink shared channel (PUSCH)

PUSCH carries uplink data (eg, UL-shared channel transport block, UL-SCH TB) and / or uplink control information (UCI), and CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform Or, it is transmitted based on a DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, if transform precoding is not possible (eg, transform precoding is disabled), the UE transmits a PUSCH based on the CP-OFDM waveform, and if transform precoding is possible (eg, transform precoding is enabled), the UE is CP-OFDM. PUSCH may be transmitted based on a waveform or a DFT-s-OFDM waveform. PUSCH transmission is dynamically scheduled by UL grant in DCI, or semi-static based on upper layer (eg, RRC) signaling (and / or Layer 1 (L1) signaling (eg, PDCCH)). Can be scheduled (configured grant). PUSCH transmission may be performed on a codebook basis or a non-codebook basis.

(2) Physical uplink control channel (PUCCH)

PUCCH carries uplink control information, HARQ-ACK and / or scheduling request (SR), and is divided into Short PUCCH and Long PUCCH according to the PUCCH transmission length. Table 5 illustrates PUCCH formats.

C. MTC (Machine Type Communication)

MTC is a form of data communication in which one or more machines are included, and is applied to Machine-to-Machine (M2M) or Internet-of-Things (IoT). Here, a machine is an object that does not require direct human intervention or intervention. For example, the machine includes a smart meter equipped with a mobile communication module, a bending machine, a mobile terminal having an MTC function, and the like. For example, a service such as meter reading, water level measurement, use of a surveillance camera, and inventory reporting of a vending machine may be provided through MTC. MTC communication has a characteristic in that the amount of transmitted data is small and the transmission / reception of uplink / downlink data occurs occasionally. Therefore, it is efficient to lower the unit cost of the MTC device and reduce the battery consumption in accordance with the low data rate. MTC devices generally have low mobility, and accordingly, MTC communication has a characteristic that a channel environment hardly changes.

In 3GPP, MTC has been applied since release 10, and can be implemented to satisfy the criteria of low cost & low complexity, enhanced coverage, and low power consumption. For example, 3GPP Release 12 adds features for low-cost MTC devices, and UE category 0 is defined for this. The UE category is an index indicating how much data the terminal can handle in the communication modem. A UE of UE category 0 can reduce baseband / RF complexity by using a single receive antenna and a half-duplex operation having a reduced peak data rate, a relaxed radio frequency (RF) requirement. In 3GPP Release 12, enhanced MTC (eMTC) was introduced, and the price and power consumption of the MTC terminal was further reduced by operating only at 1.08 MHz (ie, 6 RBs), which is the minimum frequency bandwidth supported by legacy LTE.

The contents described in this specification are mainly features related to eMTC, but can be applied to MTC, eMTC, and MTC to be applied to 5G (or NR) unless otherwise specified. For convenience of description, this specification will be collectively described as MTC.

7 illustrates cell coverage enhancement in MTC. Coverage enhancement may be referred to as coverage extension, and the technique for coverage enhancement described in connection with MTC may be equally / similarly applied to NB-IoT and 5G (or NR).

Various cell coverage extension techniques have been discussed to extend the cell coverage (Coverage Extension or Coverage Enhancement, CE) of the base station 1204 for the MTC device 1202. For example, for cell coverage extension, a base station / terminal can transmit / receive one physical channel / signal over multiple occupies (a bundle of physical channels). Within the bundle section, the physical channel / signal may be repeatedly transmitted / received according to pre-defined rules. The receiving device may increase the decoding success rate of the physical channel / signal by decoding part or all of the physical channel / signal bundle. Here, the opportunity may mean a resource (eg, time / frequency) through which a physical channel / signal can be transmitted / received. Opportunities for physical channels / signals may include subframes, slots or symbol sets in the time domain. Here, the symbol set may consist of one or more consecutive OFDM-based symbols. The OFDM-based symbol may include an OFDM (A) symbol and a DFT-s-OFDM (A) (= SC-FDM (A)) symbol. Opportunities for physical channels / signals may include frequency bands, RB sets in the frequency domain. For example, PBCH, PRACH, MPDCCH, PDSCH, PUCCH and PUSCH can be repeatedly transmitted / received.

MTC supports an operation mode for coverage enhancement or extension (Coverage Extension or Coverage Enhancement, CE), and a mode that supports repetitive transmission / reception of signals for coverage enhancement or extension may be referred to as a CE mode. The number of repetitive transmission / reception of signals for improving or extending coverage may be referred to as a CE level Table 6 illustrates CE modes / levels supported by MTC.

The first mode (eg, CE Mode A) is defined for small mobility improvement with full mobility and CSI (channel state information) feedback, so there is no repetition or fewer repetitions. The operation of the first mode may be the same as the operation range of the UE category 1. The second mode (eg, CE Mode B) is defined for UEs with extremely poor coverage conditions that support CSI feedback and limited mobility, and a large number of repetitive transmissions are defined. The second mode provides coverage enhancement of up to 15 dB based on the range of UE category 1. Each level of the MTC is defined differently in a random access process (or RACH process) and a paging process.

8 illustrates a signal band for MTC.

Referring to FIG. 8, as a method for lowering the unit price of an MTC terminal, the MTC is a specific band (or channel band) (MTC subband or narrowband (MTC subband) or narrow band (of the cell system bandwidth), regardless of the system bandwidth of the cell narrowband (NB)). For example, the uplink / downlink operation of the MTC terminal can be performed only in the 1.08 MHz frequency band. 1.08 MHz corresponds to six consecutive physical resource blocks (PRBs) in the LTE system, and was defined to follow the same cell search and random access procedure as the LTE terminal. FIG. 8 (a) illustrates a case where an MTC subband is configured at the center of a cell (eg, 6 PRBs), and FIG. 8 (b) illustrates a case where a plurality of MTC subbands are configured in a cell. The plurality of MTC subbands may be continuously / discretely configured in the frequency domain. Physical channels / signals for MTC can be transmitted and received in one MTC subband. In the NR system, the MTC subband may be defined in consideration of a frequency range and subcarrier spacing (SCS). For example, in the NR system, the size of the MTC subband may be defined as X consecutive PRBs (ie, 0.18 * X * (2 ^ μ) MHz bandwidth) (see Table 1 for μ). Here, X may be defined as 20 according to the size of the SS / PBCH (Synchronization Signal / Physical Broadcast Channel) block. In the NR system, the MTC can operate in at least one bandwidth part (BWP). In this case, a plurality of MTC subbands may be configured in the BWP.

9 illustrates scheduling in legacy LTE and MTC.

Referring to FIG. 9, in legacy LTE, a PDSCH is scheduled using a PDCCH. Specifically, the PDCCH can be transmitted in the first N OFDM symbols in a subframe (N = 1-3), and the PDSCH scheduled by the PDCCH is transmitted in the same subframe. Meanwhile, PDSCH in MTC is scheduled using MPDCCH. Accordingly, the MTC terminal can monitor the MPDCCH candidate in a search space in a subframe. Here, monitoring includes blind decoding of MPDCCH candidates. MPDCCH transmits DCI, and DCI includes uplink or downlink scheduling information. MPDCCH is multiplexed into PDSCH and FDM in a subframe. MPDCCH is repeatedly transmitted in up to 256 subframes, and DCI transmitted by MPDCCH includes information on the number of MPDCCH repetitions. In the case of downlink scheduling, when repetitive transmission of the MPDCCH ends in subframe #N, the PDSCH scheduled by the MPDCCH starts transmission in subframe # N + 2. The PDSCH can be repeatedly transmitted in up to 2048 subframes. MPDCCH and PDSCH may be transmitted in different MTC subbands. In the case of uplink scheduling, when the repetitive transmission of the MPDCCH ends in subframe #N, the PUSCH scheduled by the MPDCCH starts transmission in subframe # N + 4. For example, when the PDSCH is repeatedly transmitted in 32 subframes, the PDSCH is transmitted in the first MTC subband in the first 16 subframes, and the PDSCH in the second 16 subframes in the second MTC subband. Can be sent. MTC operates in a half-duplex mode. MTC's HARQ retransmission is an adaptive and asynchronous method.

D. NB-IoT (Narrowband Internet of Things)

NB-IoT represents a narrow-band Internet of Things technology that supports a low-power wide area network through an existing wireless communication system (eg, LTE, NR). In addition, NB-IoT may refer to a system for supporting low complexity and low power consumption through a narrowband. The NB-IoT system uses OFDM parameters such as subcarrier spacing (SCS) in the same way as the existing system, so that there is no need to separately allocate an additional band for the NB-IoT system. For example, one PRB of an existing system band can be allocated for NB-IoT. Since the NB-IoT terminal recognizes a single PRB (single PRB) as each carrier, PRBs and carriers may be interpreted in the same sense in the description of the NB-IoT.

The NB-IoT can operate in a multi-carrier mode. At this time, the carrier in the NB-IoT is an anchor type carrier (ie, an anchor carrier, an anchor PRB) and a non-anchor type carrier (ie, a non-anchor type carrier). It can be defined as an anchor carrier (non-anchor carrier), non-anchor PRB. An anchor carrier may mean a carrier that transmits NPSS, NSSS, NPBCH, and NPDSCH for system information block (N-SIB) for initial access from the base station point of view. That is, in NB-IoT, a carrier for initial connection may be referred to as an anchor carrier, and other (s) may be referred to as a non-anchor carrier. At this time, there may be only one anchor carrier on the system, or there may be multiple anchor carriers.

In this specification, the description of the NB-IoT mainly focuses on the case that is applied to the existing LTE system, but the description of the specification can be applied to the next generation system (eg, NR system, etc.). In addition, the content related to NB-IoT in the present specification may be extended to MTCs that aim for similar technical purposes (eg, low-power, low-cost, improved coverage, etc.). In addition, NB-IoT may be replaced by other equivalent terms such as NB-LTE, NB-IoT enhancement, enhanced NB-IoT, further enhanced NB-IoT, NB-NR, and the like.

NB-IoT downlink is provided with physical channels such as a narrowband physical broadcast channel (NPBCH), a narrowband physical downlink shared channel (NPDSCH), and a narrowband physical downlink control channel (NPDCCH), and a narrowband primary synchronization signal (NPSS), narrowband Physical signals such as Primary Synchronization Signal (NRS) and NRS (Narrowband Reference Signal) are provided.

The NB-IoT frame structure may be set differently according to subcarrier spacing. For example, in the NB-IoT system, 15 kHz subcarrier spacing and 3.75 kHz subcarrier spacing can be supported. The NB-IoT frame structure is not limited to this, and it is needless to say that NB-IoT for other subcarrier intervals (for example, 30 kHz, etc.) may be considered by varying time / frequency units. In addition, although the NB-IoT frame structure based on the LTE system frame structure is described as an example in this specification, it is for convenience of description and is not limited thereto, and the method described herein is a next-generation system (eg, an NR system). Of course, it can be extended to NB-IoT based on the frame structure.

The NB-IoT frame structure for the 15 kHz subcarrier interval may be set to be the same as the frame structure of the legacy system (ie, LTE system) described above. That is, the 10ms NB-IoT frame includes 10 1ms NB-IoT subframes, and the 1ms NB-IoT subframe includes 2 0.5ms NB-IoT slots. In addition, each 0.5ms NB-IoT may include 7 OFDM symbols.

For the 3.75 kHz subcarrier interval, the 10 ms NB-IoT frame includes 5 2 ms NB-IoT subframes, and the 2 ms NB-IoT subframe includes 7 OFDM symbols and one guard period (GP). It can contain. In addition, the 2ms NB-IoT subframe may be represented by an NB-IoT slot or an NB-IoT resource unit (RU).

The physical resource of the NB-IoT downlink is a physical resource of another wireless communication system (eg, LTE system, NR system, etc.), except that the system bandwidth is a certain number of RBs (eg, one RB, that is, 180 kHz). It can be set by reference. For example, as described above, when the NB-IoT downlink supports only a 15 kHz subcarrier interval, the physical resource of the NB-IoT downlink is 1 RB in the frequency domain of the resource grid of the LTE system shown in FIG. , 1 PRB). In the case of NB-IoT uplink physical resources, the system bandwidth may be limited to one RB as in the downlink.

10 illustrates transmission of an NB-IoT downlink physical channel / signal. The downlink physical channel / signal is transmitted through one PRB and supports 15kHz subcarrier spacing / multi-tone transmission.

Referring to FIG. 10, NPSS is transmitted in the 6th subframe of every frame, and NSSS is transmitted in the last (eg, 10th) subframe of every even frame. The terminal may acquire frequency, symbol, and frame synchronization by using synchronization signals (NPSS, NSSS) and search for 504 PCIDs (Physical Cell IDs). NPBCH is transmitted in the first subframe of every frame and carries NB-MIB. NRS is provided as a reference signal for downlink physical channel demodulation and is generated in the same manner as LTE. However, NB-PCID (Physical Cell ID) (or NCell ID, NB-IoT base station ID) is used as an initialization value for NRS sequence generation. NRS is transmitted through one or two antenna ports. NPDCCH and NPDSCH can be transmitted in the remaining subframes except for NPSS / NSSS / NPBCH. NPDCCH and NPDSCH cannot be transmitted together in the same subframe. NPDCCH carries DCI, and DCI supports three types of DCI formats. DCI format N0 includes NPUSCH (Narrowband Physical Uplink Shared Channel) scheduling information, and DCI formats N1 and N2 include NPDSCH scheduling information. NPDCCH can transmit up to 2048 times repeatedly to improve coverage. NPDSCH is used to transmit data (eg, TB) of a transport channel such as DL-SCH (Downlink-Shared Channel), PCH (Paging Channel). The maximum TBS is 680 bits, and up to 2048 repetitive transmissions are possible to improve coverage.

The uplink physical channel includes a narrowband physical random access channel (NPRACH) and an NPUSCH, and supports single-tone transmission and multi-tone transmission. Single-tone transmission is supported for subcarrier spacing of 3.5 kHz and 15 kHz, and multi-tone transmission is supported only for 15 kHz subcarrier spacing.

A single carrier frequency division multiple access (SC-FDMA) scheme may be applied to the NB-IoT uplink based on a subcarrier interval of 15 kHz or 3.75 kHz. In the uplink of NB-IoT, multi-tone transmission and single-tone transmission may be supported. In one example, multi-tone transmission is supported only for subcarrier spacing of 15 kHz, and single-tone transmission may be supported for subcarrier spacing of 15 kHz and 3.75 kHz.

As mentioned in the downlink section, the physical channel of the NB-IoT system may be expressed in a form in which 'N (Narrowband)' is added to distinguish it from the existing system. For example, the uplink physical channel may be defined as a narrowband physical random access channel (NPRACH) and a narrowband physical uplink shared channel (NPUSCH), and the uplink physical signal may be defined as a narrowband demodulation reference signal (NDMRS).

Here, the NPUSCH may consist of NPUSCH format 1, NPUSCH format 2, and so on. As an example, NPUSCH format 1 is used for UL-SCH transmission (or transport), and NPUSCH format 2 can be used for transmission of uplink control information such as HARQ ACK signaling.

In addition, characteristically, in the case of NPRACH, which is a downlink channel of the NB-IoT system, repetition transmission may be performed for coverage enhancement. In this case, repetitive transmission may be performed by applying frequency hopping.

E. Network access and communication process

The terminal may perform a network access process to perform the procedures and / or methods described / suggested herein. For example, while the terminal performs a connection to a network (eg, a base station), it may receive and store system information and configuration information necessary to perform the procedures and / or methods described / suggested herein. Configuration information necessary for the present invention may be received through higher layer (eg, RRC layer; Medium Access Control, MAC, layer, etc.) signaling.

11 illustrates a network initial access and subsequent communication process in the NR system. In NR, a physical channel and a reference signal may be transmitted using beam-forming. When beam-forming-based signal transmission is supported, a beam management process may be performed to align beams between a base station and a terminal. In addition, the signal proposed in the present invention can be transmitted / received using beam-forming. In the radio resource control (RRC) IDLE mode, beam alignment may be performed based on SSB. On the other hand, beam alignment in RRC CONNECTED mode may be performed based on CSI-RS (in DL) and SRS (in UL). Meanwhile, when beam-forming-based signal transmission is not supported, a beam-related operation may be omitted in the description of the present specification.

Referring to FIG. 11, a base station (eg, BS) may periodically transmit an SSB (S1902). Here, the SSB includes PSS / SSS / PBCH. The SSB can be transmitted using beam sweeping. The PBCH includes a Master Information Block (MIB), and the MIB may include scheduling information regarding Remaining Minimum System Information (RMSI). Thereafter, the base station may transmit the RMSI and other system information (OSI) (S1904). The RMSI may include information (eg, PRACH configuration information) necessary for the UE to initially access the base station. Meanwhile, the terminal performs SSB detection and then identifies the best SSB. Thereafter, the terminal may transmit the RACH preamble (Message 1, Msg1) to the base station using the PRACH resource linked / corresponding to the index (ie, beam) of the best SSB (S1906). The beam direction of the RACH preamble is associated with PRACH resources. Association between PRACH resources (and / or RACH preamble) and SSB (index) may be established through system information (eg, RMSI). Then, as part of the random access process (or RACH process), the base station transmits a RAR (Random Access Response) (Msg2) in response to the RACH preamble (S1908), and the UE uses Msg3 (eg, UL grant in RAR). , RRC Connection Request) (S1910), and the base station may transmit a contention resolution (contention resolution) message (Msg4) (S1920). Msg4 may include RRC Connection Setup.

When an RRC connection is established between a base station and a terminal through a random access process (or RACH process), subsequent beam alignment may be performed based on SSB / CSI-RS (in DL) and SRS (in UL). For example, the terminal may receive SSB / CSI-RS (S1914). SSB / CSI-RS may be used by the UE to generate a beam / CSI report. Meanwhile, the base station may request the beam / CSI report to the UE through DCI (S1916). In this case, the UE may generate a beam / CSI report based on the SSB / CSI-RS, and transmit the generated beam / CSI report to the base station through PUSCH / PUCCH (S1918). The beam / CSI report may include beam measurement results, information on a preferred beam, and the like. The base station and the terminal can switch the beam based on the beam / CSI report (S1920a, S1920b).

Thereafter, the terminal and the base station may perform the procedures and / or methods described / proposed above. For example, the terminal and the base station process the information in the memory according to the proposal of the present invention based on the configuration information obtained in the network access process (eg, system information acquisition process, RRC connection process through RACH, etc.), and then wireless signal. Or transmit the received wireless signal and store it in memory. Here, the radio signal may include at least one of PDCCH, PDSCH, and RS (Reference Signal) for downlink, and at least one of PUCCH, PUSCH, and SRS for uplink.

The contents described above can be basically applied to MTC and NB-IoT in common. The differences between MTC and NB-IoT are described further below.

MTC network access process

The process of accessing the MTC network based on LTE will be further described. The following description can be extended to NR. In FIG. 1 and / or FIG. 11, the PDCCH is replaced with MPDCCH (MTC PDCCH) (eg, see FIG. 9 and related descriptions).

In LTE, the MIB includes 10 reserved bits. In MTC, five MSBs (Most Significant Bits) out of ten spare bits in the MIB are used to indicate scheduling information for System Information Block for bandwidth reduced device (SIB1-BR). Five MSBs are used to indicate the number of repetitions of SIB1-BR and Transport Block Size (TBS). SIB1-BR is transmitted on the PDSCH. SIB1-BR may not change in 512 radio frames (5120 ms) to allow multiple subframes to be combined. Information carried in SIB1-BR is similar to SIB1 in LTE system.

The MTC random access process (or RACH process) is basically the same as the LTE random access process (or RACH process) (for example, see FIG. 2 and related descriptions), and has the following differences: MTC random access process (or RACH process). Is performed based on a CE (Coverage Enhancement) level. For example, in order to improve PRACH coverage, whether or not the PRACH is repeatedly transmitted / numbered for each CE level may be different. As described with reference to Table 6, a mode that supports repetitive transmission of signals for coverage enhancement or extension is referred to as a CE mode, and a repetitive transmission number of signals for coverage enhancement or extension is referred to as a CE level. For example, as illustrated in Table 6, the first mode (eg, CE mode A) is a mode for small coverage enhancement in which full mobility and CSI feedback are supported, and may be set with no repetition or a small number of repetitions. The second mode (eg, CE mode B) is a mode for a terminal having extremely poor coverage conditions supporting CSI feedback and limited mobility, and the number of repetitions can be largely set.

The base station broadcasts system information including a plurality of (eg, three) RSRP (Reference Signal Received Power) threshold values, and the UE can determine the CE level by comparing the RSRP threshold value with the RSRP measurement value. The following information for each CE level can be independently configured through system information.

-PRACH resource information: period / offset of PRACH opportunity, PRACH frequency resource

-Preamble group: a set of preambles allocated for each CE level

-Number of repetitions per preamble attempt, maximum number of preamble attempts

-RAR window time: the length of the time period in which RAR reception is expected (eg, the number of subframes)

-Conflict resolution window time: Length of time period in which collision resolution message is expected to be received

After selecting the PRACH resource corresponding to the CE level of the UE, the UE may perform PRACH transmission based on the selected PRACH resource. The PRACH waveform used in MTC is the same as the PRACH waveform used in LTE (eg, OFDM and Zadoff-Chu sequences). Signals / messages transmitted after PRACH may also be repeatedly transmitted, and the number of repetitions may be independently set according to CE mode / level.

NB-IoT network access process

The process of accessing the NB-IoT network based on LTE will be further described. The following description can be extended to NR. 1 and 11, PSS, SSS and PBCH are replaced by NPSS, NSSS and NPBCH in NB-IoT, respectively. 10 for NPSS, NSSS, and NPBCH. 1 and / or 11, PDCCH, PDSCH, PUSCH, and PRACH are replaced with NPDCCH, NPDSCH, NPUSCH, and NPRACH.

The NB-IoT random access process (or RACH process) is basically the same as the LTE random access process (or RACH process) (for example, see FIG. 2 and related descriptions) and differs in the following matters. First, the RACH preamble format is different. In LTE, the preamble is based on code / sequence (eg, zadoff-chu sequence), whereas in NB-IoT, the preamble is a subcarrier. Second, the NB-IoT random access process (or RACH process) is performed based on the CE level. Therefore, PRACH resources are allocated differently for each CE level. Third, since the SR resource is not configured in the NB-IoT, the uplink resource allocation request in the NB-IoT is performed using a random access process (or RACH process).

12 illustrates preamble transmission in an NB-IoT RACH.

Referring to FIG. 12, the NPRACH preamble is composed of 4 symbol groups, and each symbol group may be composed of a CP and a plurality of (eg, 5) SC-FDMA symbols. In NR, the SC-FDMA symbol may be replaced with an OFDM symbol or DFT-s-OFDM symbol. NPRACH only supports single-tone transmission at 3.75 kHz subcarrier spacing, and provides CPs of 66.7 μs and 266.67 μs in length to support different cell radii. Each symbol group performs frequency hopping, and the hopping pattern is as follows. The subcarrier transmitting the first symbol group is determined in a pseudo-random manner. The second symbol group is 1 subcarrier hopping, the third symbol group is 6 subcarrier hopping, and the fourth symbol group is 1 subcarrier hopping. In the case of repetitive transmission, the frequency hopping procedure is repeatedly applied, and the NPRACH preamble can be repeatedly transmitted {1, 2, 4, 8, 16, 32, 64, 128} times to improve coverage. NPRACH resources can be configured for each CE level. The UE may select the NPRACH resource based on the CE level determined according to the downlink measurement result (eg, RSRP), and transmit the RACH preamble using the selected NPRACH resource. The NPRACH can be transmitted on an anchor carrier or a non-anchor carrier with NPRACH resources set.

F. Symbols, abbreviations and terms

The symbols / abbreviations / terms used in the present specification are as follows.

-TB: Transport Block

-Multiple-TB: Multiple Transport Blocks

-BD: Blind Decoding or Blind Detection

-CB: Code Block

-CBG: Code Block Group

-PDCCH: Physical Downlink Control Channel

-NPDCCH: Narrowband Physical Downlink Control Channel

-MPDCCH: MTC Physical Downlink Control Channel

-PDSCH: Physical Downlink Shared Channel

-NPDSCH: Narrowband Physical Downlink Shared Channel

-PUCCH: Physical Uplink Control Channel

-PUSCH: Physical Uplink Shared Channel

-NPUSCH: Narrowband Physical Uplink Shared Channel

-DCI: Downlink Control Information

G. Proposal method of this specification

The above salpin contents (3GPP system, frame structure, MTC / NB-IoT system, etc.) can be applied in combination with the methods proposed in the specification, which will be described later, or to clarify the technical characteristics of the methods proposed in the specification. Can be replenished.

The operations related to collision handling for multi-TB scheduling proposed in the present specification, which will be described later, may be applied in combination with one or more of the above-described initial access (IA) procedure and random access (RA) procedure.

First, a UE operation performed in connection with an initial access procedure and / or a random access procedure described above is performed in connection with collision handling for multi-TB scheduling proposed in the present specification. Is as follows.

The UE (UE) is defined (define) or configured (configured) parameters (or control information) to perform the methods proposed herein (1) initial access procedure (or included in the initial access procedure) Signaling received through a random access procedure (eg, DCI, MAC CE, reference signal, synchronization signal, etc.) can be configured from the base station, or (2) initial access procedure (or included in the initial access procedure) After the random access procedure), it may be configured through signaling received in the RRC connected state (eg, DCI, MAC CE, reference signal, synchronization signal, RRC signaling, etc.).

And, the UE (UE) may perform the methods proposed in the specification after the initial access procedure (or a random access procedure included in the initial access procedure) based on the parameters received above.

Next, the operation of the base station will be described.

The base station sets parameters (or control information) for performing the methods proposed in this specification through (1) initial access procedure (or random access procedure included in the initial access procedure), and sets the set parameters to specific signaling (eg : DCI, MAC CE, reference signal, synchronization signal, etc., transmitted to the terminal (UE), or (2) initial access procedure (or random access procedure included in the initial access procedure) is set in the RRC connection state, The set parameters may be transmitted to the UE through specific signaling (eg, DCI, MAC CE, reference signal, synchronization signal, RRC signaling, etc.).

And, the base station can perform the methods proposed in this specification after the initial access procedure (or a random access procedure included in the initial access procedure) based on the corresponding parameters.

In this specification, some control channels in a transport structure of multiple transport blocks (Multi-TB) scheduling that control transmission of a plurality of traffic channels using one control channel Alternatively, a method for resolving a collision problem when a traffic channel is transmitted with another signal or a channel is proposed.

Multi-TB scheduling for scheduling a plurality of TBs using one DCI for the purpose of resource overhead reduction from a base station perspective and power consumption reduction from a terminal perspective ) Structure can be used. At this time, TB refers to a transmission unit of data to be transmitted by a base station or a terminal, and one TB may be composed of one or more CBs or CBGs.

When a multi-TB scheduling structure is used, the UE acquires scheduling information for a plurality of TB transmissions after acquiring one DCI, and uses this to assume information about the transmission resource to be transmitted and the encoded form. And perform a transmit / receive operation. In addition, the base station provides scheduling information for a plurality of TB transmissions to a terminal through a single DCI, and based on this information, a transmission resource and an encoding type to which TBs are transmitted can be determined to perform a transmission / reception operation.

13 shows an operation sequence of a UL transmission process and a DL reception process of a terminal supporting a multi-TB scheduling structure. 14 shows an operation sequence of a UL reception process and a DL transmission process of a base station supporting a multi-TB scheduling structure. 15 shows a process of interoperation between a terminal and a base station.

In the case of multi-TB scheduling, compared to single-TB scheduling (eg, referring to a structure in which a terminal acquires scheduling information for one TB through one DCI), a time / frequency domain (time / It requires a wider transmission resource region on the frequency domain), and it may be difficult to adaptively reconstruct it after the corresponding transmission resource region is configured once by DCI. Therefore, the structure of multi-TB scheduling may be more frequent in collision and overlap problems in which regions of transmission resources used and transmission of different signals / channels overlap each other than the structure of single-TB scheduling. .

In this specification, we propose methods to solve the collision and overlap problem in such a multi-TB scheduling structure.

In addition or independently of the collision and overlapping problem, when multi-TB scheduling is applied, an understanding of the location of transmission resources on a time / frequency domain in which a plurality of TBs are transmitted between a base station and a terminal must be consistent. As discussed above, in the process of transmitting a plurality of TBs, when the transmission location of the TBs is fixed in advance by DCI or higher layer signals, collision and overlapping problems with other signals / channels may occur. As a method for avoiding this, a method of increasing the flexibility of the TB transmission structure using DCI or configuration information through a higher layer signal may be considered, but this method increases resource overhead and increases base station and terminal. There may be limitations in that it can increase the complexity of.

In the present invention, in the multi-TB scheduling structure, a method for determining a TB transmission location that can be recognized by a base station and a terminal is considered, and at the same time, solving a limitation of TB transmission due to collision and overlap. Suggestions for doing this.

A specific method for operating multi-TB scheduling considered in the present invention may be one of the methods listed below. 16 is an example showing an example of the methods listed below.

(1) DCI skipping (DCI skipping): When a terminal acquires DCI in a search space of a specific location, it expects transmission of a scheduled TB in the corresponding search space and at the same time, a plurality of search spaces appearing thereafter For this method, it is possible to expect transmission of the corresponding TB without decoding of DCI. For example, as illustrated in FIG. 16 (a), the UE is scheduled to transmit TBs corresponding to a plurality of search spaces through one DCI, and additional monitoring of the search spaces corresponding to the scheduled TBs is performed. Can be skipped.

(2) One-to-N mapping DCI (One-to-N mapping DCI): One or more TBs corresponding to one DCI exist, and one DCI corresponding to one TB is a method of scheduling in a single structure. For example, as illustrated in FIG. 16 (b), the UE is scheduled to transmit a plurality of TBs corresponding to a corresponding search space through one DCI.

(3) Combination of DCI skipping and One-to-N mapping DCI: A combination of the two methods. For example, as illustrated in FIG. 16 (c), one DCI can schedule a plurality of TBs corresponding to each other, and the UE transmits a plurality of TBs corresponding to a plurality of search spaces through one DCI. You will be scheduled, and you can skip the additional monitoring operation for the search space corresponding to the scheduled TB.

Hereinafter, the proposed method is described based on the operation method of the NB-IoT for convenience of description, but is also the same for various communication systems (eg, LTE, MTC, NR, etc.) in which a multi-TB scheduling structure is used. It is obvious that it can be applied in a similar way. In addition, in the description of the present specification, terms such as symbols, slots, and subframes express transmission / reception units in a time domain of a signal or channel in a specific situation. It is apparent that the unit used may be replaced with another transmission / reception unit according to the characteristics of the communication system to which the proposed method of the present specification can be applied.

The methods proposed in the present specification can be applied to each one as an independent method, but it is obvious that one or more methods can be used in combination.

G.1 Collision between skipping search space and other signal / channel

In section G.1 of the present specification, when a multi-TB scheduling scheme uses a DCI skipping structure, a search space to be skipped is a different purpose. We propose a method to solve the problem of signal / channel transmission and collision. The proposed methods are written based on the multi-TB scheduling of the DCI omitted method, but can be applied to other multi-TB scheduling methods as long as the spirit of the invention is not violated. For example, the proposed method may be used even when a DCI of a one-to-N mapping method is used.

The DCI-omitted multi-TB scheduling method can share a search space and a TB transmission used by a single-TB scheduling terminal without multi-TB scheduling capability. There is an advantage that the power saving effect of the UE can be obtained without increasing the resource overhead. In addition, when the TB scheduled by the DCI of the one-to-N mapping scheme is configured to be shared with the TB expected by the UE of the single-TB scheduling scheme, the overhead reduction expected from the DCI skipping scheme is reduced. You can expect the benefits of saving) similarly. Therefore, in the multi-TB scheduling operation design, the purpose of overhead reduction to reduce unnecessary transmission of the base station and the purpose of power saving to reduce unnecessary decoding of the terminal should be considered.

In a search space that a terminal needs to monitor in order to schedule a multi-TB, a signal / channel of a different purpose and a location of a transmission resource may collide. If the signal / channel has a higher priority than the search space, the search space is dropped and the base station may not transmit DCI to the search space, and the UE receives DCI from the search space. You cannot expect.

In the present specification, assumptions about TB transmission corresponding to a dropped search space of a UE operating in a DCI omission-based or one-to-N mapping multi-TB scheduling method in a situation in which the above problem occurs I suggest a method. In the following description, the description is based on the DCI omission method, and this may be applied to the one-to-N mapping method even without a separate description.

[Method G.1-1]

From the viewpoint of multi-TB scheduling in which DCI skipping is used, even when DCI transmission / reception in a specific search space is dropped, the UE may perform a previous point in time. If the DCI has already been acquired and the search space of the dropped DCI is a location corresponding to the DCI omission, TB transmission can be expected. In this case, when the DCI is acquired in a specific search space, the UE can always expect scheduling of TBs corresponding to a plurality of search spaces appearing in succession regardless of whether the search space is dropped. At this time, the base station can perform the corresponding TB transmission even if the DCI transmission is not performed (or not) in the search space of a specific location.

If one-to-N mapping type multi-TB scheduling is used, DCI may be dropped at a location of a search space where single-TB scheduling DCI can be transmitted. In the case, the above method can be applied. For example, if the UE has already acquired the multi-TB scheduling DCI at a previous time, it may be determined to expect transmission of the TB regardless of whether other DCIs scheduling the same TB are dropped.

[Method G.1-2]

If DCI transmission in a specific search space is dropped by transmission of other target signals / channels having a higher priority, the conventional single-TB scheduling method is used. The UE to use cannot receive scheduling information for the TB corresponding to the dropped DCI. Therefore, in terms of a single-TB scheduling scheme, it may be advantageous in terms of resource overhead saving that the base station does not transmit the TB corresponding to the dropped DCI.

However, if the base station transmits the TB corresponding to the dropped DCI only for the terminal having the multi-TB scheduling capability as in the method proposed in [Method G.1-1] above However, the base station has to transmit the same TB again for a terminal without multi-TB scheduling capability, which may cause an increase in resource overhead. In order to prevent such a problem, when DCI transmission and reception in a specific search space is dropped, a terminal applying multi-TB scheduling of DCI skipping (DCI skipping) expects transmission of TB corresponding to the search space. You can decide not to. Alternatively, when a terminal applying multi-TB scheduling in a one-to-N mapping DCI (DCI) method, a single-TB scheduling DCI capable of scheduling a specific TB is dropped, It can be decided not to expect the transmission of the TB. In this case, when the DCI is acquired in a specific search space, the UE can always expect scheduling for TBs corresponding to a plurality of search spaces appearing in succession, except when the search space is dropped. At this time, the base station may transmit the corresponding TB even when the DCI transmission is not performed in the search space of a specific location, but may not transmit the TB when the DCI transmission is dropped.

17 schematically shows an example of the proposed method.

Referring to FIG. 17, when the proposed [method G.1-2] is used and the UE is determined to be scheduled N TBs through one DCI, TBs that do not expect transmission due to the dropped DCI The position of N can be determined not to be included in calculating the size of N. This has the advantage that the number of TBs that the terminal can acquire is always kept the same, thereby preserving the benefits of multi-TB scheduling. Or, on the contrary, the location of the TB that is not expected to be transmitted due to the dropped DCI may be determined to be included in calculating the size of N. This may be for the purpose of constantly fixing the time to wait until the base station monitors the next DCI after acquiring one DCI, and has the advantage that the terminal can update the scheduling information of the TB at regular intervals. For example, when information of a change notification is included in the DCI, such as a single cell point to multipoint (SC-PTM), an operation of the terminal to check the information of the change notification at a predetermined cycle may be necessary.

As an example of another purpose signal / channel having a higher priority in the proposed methods, it is considered to transmit system information that should be periodically transmitted without a separate control channel, such as a system information block (SIB). Can be. The application of the proposed method can be limited to the case where a physical channel transmitted to a search space is dropped due to a collision with a specific signal / channel. If postpone rules are used, If possible, the proposed methods may not apply.

In the proposed methods, the drop of DCI is the entire area of the search space in which DCI can be transmitted by transmission of another signal / channel having a higher priority that both the terminal and the base station can recognize equally. It can be limited to cases where it cannot be used. This is for the purpose of performing TB transmission for UEs that do not start DCI omission by transmitting DCI to a search space area that is not dropped when a part of the search space is available or that uses a single-TB scheduling method. Can be Alternatively, in the proposed methods, the drop of DCI is the entire search space in which DCI can be transmitted by transmission of another signal / channel having a higher priority that both the terminal and the base station can recognize equally. It can be limited to cases in which a certain percentage of the area is not used. This allows DCI to be transmitted to a non-dropped search space area when a part of the search space is available, but DCI decoding performance decreases when the size of the dropped area increases by a certain percentage or more. It may be for the purpose of preventing the phenomenon.

In the proposed methods, a search space for determining whether a DCI is dropped is the same as a UE expecting multi-TB scheduling and a UE expecting single-TB scheduling in the case of DCI skipping (DCI skipping). It may be an expected search space, and when a one-to-N mapping is used, only a UE expecting single-TB scheduling may be defined to be limited to a search space expecting DCI.

G.2 Determining resource allocation of scheduled TB

In this specification, when the multi-TB scheduling scheme uses a DCI skipping structure, a method of determining resource allocation of a scheduled TB corresponding to each search space is proposed. Although the proposed methods are prepared based on the DCI omitting method multi-TB scheduling, it is apparent that the method can be applied to other multi-TB scheduling methods as long as it does not violate the principles of the proposed method. For example, the proposed method may be used even when a DCI of a one-to-N mapping method is used.

When the multi-TB scheduling of the DCI omission method is used, the UE simultaneously uses the configuration information of the TB corresponding to the DCI and the configuration information of the TB corresponding to a plurality of search spaces using the acquired DCI information. Must be acquired. At this time, if the DCI includes all of the configuration information for a plurality of TB, (1) a single-TB capable (single-TB capable or single-TB capability) legacy DCI (legacy DCI) for supporting the terminal The sharing operation becomes impossible, and (2) even when a new DCI for a terminal having multi-TB capability (multi-TB capable or multi-TB capability) is introduced, the DCI size increases. . From this point of view, when DCI omitting multi-TB scheduling is used, each DCI includes only configuration information for one TB corresponding to the search space to be transmitted, and utilizes information and other additional information included in the decoded DCI. Therefore, a method of determining that the terminal can recognize information about the additional TB transmission may be useful.

Some of the information provided through DCI may be difficult to apply the same value to a plurality of TBs. As a characteristic example, a problem related to scheduling of the TB transmission location of the NB-IoT may be considered. The starting subframe position of the NPDSCH / NPUSCH scheduled by the DCI in the NB-IoT is the ending subframe position of the NPDCCH used for DCI transmission and the scheduling delay included in the DCI. It is determined by the value. At this time, the transmission location of the NPDCCH through which DCI is transmitted is determined as one of search space candidates, and the base station can dynamically determine available search space candidates according to resource availability and radio channel environment. have.

FIG. 18 schematically shows an example of a search space candidate used to transmit a DCI masked from NB-IoT to G-RNTI (Group RNTI or Group Radio Network Temporary Identifier). In the example of the figure, each block represents a search space candidate, and Rmax represents a maximum size of transmittable subframe level repetition. As shown in the example of the figure, the ending subframe of the NPDCCH may vary according to a search space candidate selected by the base station. In addition, in the current standard, the value of the scheduling delay can also be dynamically determined for each DCI transmission. When considering such a structure, a UE performing multi-TB scheduling of the DCI omission method may need a promised rule for acquiring scheduling information of multiple TBs using one DCI information.

It is also possible to consider a case where a TB scheduled by a one-to-N mapping DCI scheme is shared with a TB scheduled by a single-TB scheduling DCI. At this time, the transmission location of the TB that can be specified by the single-TB scheduling DCI may vary depending on the situation, and a situation may occur in which the same TB location is scheduled in different search space locations. A promised rule may be required to ensure that the transmission location of TBs expected by the UE of the one-to-N mapping DCI scheme is well shared with the transmission location of TBs scheduled due to the single-TB scheduling DCI.

[Method G.2-1]

In order to provide scheduling information for a plurality of TBs when DCI skipping (DCI skipping) multi-TB scheduling is used, the same search space candidate is always searched in a section where DCI omission can be maintained. candidate) is used, and at the same time, a scheduling delay for TB transmission can be set to be always applied the same. At this time, the UE may assume that the same search space candidate is always fixed and used while DCI omission is performed after decoding one DCI. At this time, the base station may decide to always use the same search space candidate in a section where the UE can maintain DCI omission. In this case, the same search space candidate means a search space candidate in which both the size and the relative position in the search space are fixed.

19 schematically shows an example of the proposed method. In the example of the figure, the DCI is transmitted using the same search space candidates in two adjacent search spaces, and the scheduling delay from the ending subframe of each search space candidate to the starting subframe of each TB is the same. have. For example, referring to FIG. 19, a DCI (eg, DCI 1) searches a specific search space candidate (eg, hatched) in a search space (eg, a search space associated with DCI 1) for multiple transport block scheduling. Based on what is received through the parent search space candidate), the start position (eg, start subframe) of the transport block (eg, TB 1) is the end position (eg, end subframe) and scheduling delay of the specific search space candidate. It is determined based on (scheduling delay) (eg, k1), and the specific search space candidate and the scheduling delay are equally applied to the determination of the starting position (eg, starting subframe) of the next transport block (eg, TB 2). Can be. Therefore, the starting position (eg, starting subframe) of the next transport block (eg, TB 2) is the same search space candidate used to determine the starting position (eg, starting subframe) of the previous transport block (eg, TB 1). Determined based on the end position (eg, end subframe) and scheduling delay (eg, k2) of the (eg, hatched search space candidate), scheduling delay (eg, k2) for the next transport block (eg, TB 2) ) May be set to the same value as the scheduling delay (eg, k1) for the previous transport block (eg, TB 1).

In the proposed method, the search space candidate to be used may be determined not to be determined in advance but to be searched by the terminal through BD (blind decoding or blind decoding). This method has an advantage that the base station can be changed according to the situation without a separate signaling overhead when the search space candidate used can be changed. Alternatively, the search space candidate to be used may be designated by the base station to be signaled in the configuration process of multi-TB scheduling. For example, when multi-TB scheduling is used for transmission of a single cell multicast traffic channel (SC-MTCH), DCI search space candidate information for an SC-MTCH is obtained by using a single cell multicast control channel (SC-MCCH). You can decide to set. This has the advantage of reducing the power consumption of the terminal due to BD while ensuring the flexibility of the base station. Alternatively, the search space candidate used may be a value defined by the standard. This method has an advantage of reducing power consumption due to signaling overhead of the base station and BD of the terminal, instead of giving up scheduling flexibility to select a search space candidate.

In the proposed method, the scheduling delay value used may be determined to be obtained by the UE through DCI decoding. This has the advantage that if the base station can adjust the transmission location of the TB, it allows this to increase scheduling flexibility. Alternatively, the scheduling delay value used may be designated by the base station to be signaled in the configuration of multi-TB scheduling. For example, when multi-TB scheduling is used for transmission of a single cell multicast traffic channel (SC-MTCH), scheduling delay information for SC-MTCH can be determined by using a single cell multicast control channel (SC-MCCH). have. In this case, the UE has an advantage in that decoding performance can be improved by using a predetermined scheduling delay value as side information in the DCI decoding process. Alternatively, a value defined by the standard may be used as the scheduling delay value used. This method has the advantage of improving the signaling overhead of the base station and the decoding performance of the terminal, instead of giving up scheduling flexibility to adjust the scheduling delay.

[Method G.2-1] proposed by the present invention and additional detailed technologies related thereto are for the purpose of reducing power consumption due to BD of a terminal when a plurality of search space candidates to be monitored by the terminal exist. It can also be used. As an example, when the UE can know that a specific search space candidate (or search space candidate group) is used among a plurality of search space candidates to be monitored by [Method G.2-1], only the target search space candidate is selected. It can be decided not to perform unnecessary BD by setting it to be monitored. This application method can be applied to both the purpose for multi-TB scheduling and the purpose for single-TB scheduling.

[Method G.2-1-a]

In the method proposed in [Method G.2-1], a scheduling restriction situation in which a fixed search space candidate is not suitable for transmission and reception of DCI may occur depending on the situation. For example, a case where a fixed search space candidate collides with a transmission position of another signal / channel having a higher priority at a specific time and may drop. In this case, simply, a method of applying the methods proposed in Section G.1 as a search space candidate unit may be used. For example, a method of determining a transmission location of TB based on a fixed search space candidate and a scheduling delay value may be used regardless of whether transmission of a TB corresponding to a corresponding search space candidate is assumed, or whether DCI transmission is caused by collision. Can be. This has the advantage of reducing the complexity by simplifying the operation of the base station and the terminal.

[Method G.2-1-b]

Alternatively, in the method proposed in [Method G.2-1], a scheduling restriction situation in which a fixed search space candidate is not suitable for transmission and reception of DCI occurs, but single-TB scheduling Terminals operating in the (single-TB scheduling) method may have a situation in which there is an available search space candidate. In this case, if DCI is not transmitted to the corresponding search space in consideration of only a terminal supporting a multi-TB scheduling method, the existing single-TB scheduling methods have a disadvantage of losing scheduling opportunities. do. Conversely, if a search space candidate other than a fixed search space candidate is randomly used for a single-TB scheduling type terminal, the multi-TB scheduling type terminal may not know the transmission location of the TB corresponding to the search space. .

In consideration of such a situation, when a fixed search space candidate is not suitable for transmission and reception of DCI, a method of reselecting another search space candidate according to a previously promised rule may be used. At this time, the size of the re-selected search space candidate (eg, the repetition level of the search space candidate) and the scheduling delay relationship between TB may be determined to remain the same. For example, the re-selected search space candidate may be set to select the closest search space candidate from among search space candidates that can transmit / receive DCI located before (or located in front of) a previously fixed search space candidate.

20 schematically shows an example of the proposed method. For example, referring to FIG. 20, a starting position of transport blocks (eg, DCI 1 and DCI 2) according to the proposed method G.2-1 may be determined based on the same search space candidate and the same scheduling delay. However, when the same search space candidate (or DCI) is dropped due to collision with another signal / channel, a starting position (eg, a starting subframe) of a transport block is a search space adjacent to the same search space candidate It may be determined based on an end position (eg, an end subframe) of the candidate (eg, a search space candidate adjacent to the same search space candidate or a search space candidate adjacent to the same search space candidate) and the same scheduling delay.

In the proposed method, the search space candidate used after the reselection of the search space candidate is caused by the drop of DCI may be fixed before the collision occurs and set to return to the used search space candidate. Characteristically, if a search space candidate to be used is defined by a standard or is determined by signaling during configuration of multi-TB scheduling, maintain it at a location where no DCI drop occurs. It may be for the purpose.

Alternatively, in the proposed method, the search space candidate used after the reselection of the search space candidate occurs by the drop of the DCI may be determined to maintain the reselected search space candidate. This may be for the purpose of matching understanding of search space candidates between a terminal that has obtained DCI and a terminal that is already performing DCI omission when a search space candidate is not set in advance and the terminal searches using BD. have.

[Method G.2-1-c]

Alternatively, in the method proposed in [Method G.2-1], if a fixed search space candidate is not suitable for DCI transmission / reception, a scheduling restriction situation occurs, the base station is fixed. A DCI may be allowed to be transmitted using an arbitrary search space candidate other than the search space candidate. At this time, the value of the scheduling delay included in the transmitted DCI may be different from the previously used value. At this time, the terminal may perform BD on all search space candidates in the search space in order to find a location where the DCI is transmitted. The proposed method has an advantage in that the base station can dynamically select a suitable search space candidate when the search space candidate to transmit the DCI is dropped.

21 schematically shows an example of the proposed method. For example, referring to FIG. 21, according to the proposed method G.2-1, the starting positions of the transport blocks (eg, DCI 1 and DCI 2) are the same search space candidate and the same scheduling delay (eg, k1, k2). It can be determined based on. However, when the same search space candidate (or DCI) is dropped due to collision with another signal / channel, the starting position (eg, starting subframe) of the transport block is within the search space associated with the transport block. It may be determined based on an end position (eg, an end subframe) of a search space candidate (eg, a search space candidate hatched in the right search space of FIG. 21) that is not the same search space candidate and the same scheduling delay.

In the proposed method, the search space candidate used after the reselection of the search space candidate is caused by the drop of DCI may be fixed before the collision occurs and set to return to the used search space candidate. Characteristically, if a search space candidate to be used is defined by a standard or is determined by signaling during configuration of multi-TB scheduling, maintain it at a location where no DCI drop occurs. It may be for the purpose.

Alternatively, in the proposed method, the search space candidate used after the reselection of the search space candidate occurs by the drop of the DCI may be determined to maintain the reselected search space candidate. This is to match the understanding of the search space candidate between the terminal that has obtained DCI and the terminal that is already performing DCI skipping (DCI skipping) when the search space candidate is not set in advance and the terminal searches using BD. It may be for the purpose.

[Method G.2-2]

In order to provide scheduling information for a plurality of TBs when DCI skipping (DCI skipping) multi-TB scheduling is used, a starting point of a search space in a section where DCI omission can be maintained The search space candidate is selected so that the interval between the locations where the search space candidate used from the end is always the same, and at the same time, the scheduling delay for TB transmission can be determined to be applied equally at all times. At this time, after acquiring the DCI in the search space of a specific location, the UE can know the location where the transmission of the TB starts by using the location where the search space candidate can be used and the scheduling delay value can be used within a section to which DCI omission is applied. . At this time, the base station may select one of a plurality of search space candidates satisfying the condition of the location where the search space candidate ends and transmit the DCI according to the situation. The proposed method has an advantage that the base station can maintain the same location in all search spaces while guaranteeing scheduling flexibility for the base station to select search space candidates.

As an example of the proposed method, a location where the search space candidate ends in NB-IoT may be determined as an ending subframe of the search space candidate. 22 schematically shows an example of the proposed method. In the example of the figure, the available search space candidate shows an operation when the condition ending in the reference ending subframe expressed by the dotted line (red) is satisfied.

In the proposed method, the end position of the reference search space candidate may not be determined in advance, but may be determined to be searched by the terminal through BD (blind decoding or blind decoding). This method has an advantage that the base station can be changed according to the situation without additional signaling overhead when it is possible to change the search space candidate used. Alternatively, the end position of the reference search space candidate may be designated by the base station to be signaled in the configuration process of multi-TB scheduling. For example, when multi-TB scheduling is used for transmission of a single cell multicast traffic channel (SC-MTCH), a termination sub of a DCI search space candidate for SC-MTCH using a single cell multicast control channel (SC-MCCH) Frame information can be set to be set. This has the advantage of reducing the power consumption of the terminal due to BD while ensuring the flexibility of the base station. Alternatively, the search space candidate used may be a value defined by the standard. For example, when multi-TB scheduling is used for transmission of the SC-MTCH, the ending subframe of the search space candidate of DCI for the SC-MTCH can be determined to be always fixed to the ending subframe of the search space. This method has an advantage of reducing power consumption due to signaling overhead of the base station and BD of the terminal, instead of giving up scheduling flexibility for selecting a search space candidate.

In the proposed method, the scheduling delay value used may be determined to be obtained by the UE through DCI decoding. This has the advantage that if the base station can adjust the transmission location of the TB, it allows this to increase the scheduling flexibility (scheduling flexibility). Alternatively, the scheduling delay value used may be designated by the base station to be signaled in the configuration process of multi-TB scheduling. For example, when multi-TB scheduling is used for transmission of the SC-MTCH, it may be determined to set scheduling delay information for the SC-MTCH using the SC-MCCH. In this case, the terminal has an advantage in that decoding performance can be improved by using a predetermined scheduling delay value as side information in the DCI decoding process. Alternatively, a value defined by the standard may be used as the scheduling delay value used. This method has the advantage of increasing the signaling overhead of the base station and the decoding performance of the terminal, instead of giving up the scheduling flexibility to adjust the scheduling delay.

When the proposed [method G.2-2] is used, there may be a time point in which there is no search space candidate that satisfies the condition of the position ended by transmission / reception of a signal / channel having a higher priority. In this case, the base station and the terminal can solve the problem using the principles of other methods proposed in this specification. For example, in the methods proposed in [Method G.1-1] or [Method G.1-2], replace the condition of “Search space” with “Search space candidate that satisfies the ending location condition”, or [Method G .2-1], you can solve the problem by adding the condition for “end of location” to the condition of “search space candidate”.

[Method G.2-2] proposed in this specification and additional detailed technologies related thereto are for reducing power consumption due to BD of a terminal when a plurality of search space candidates to be monitored by the terminal exist. It can also be used as For example, if the UE can know that a specific search space candidate (or search space candidate group) is used among a plurality of search space candidates to be monitored by [Method G.2-2], only the target search space candidate is selected. It can be decided not to perform unnecessary BD by setting it to monitor. This application method can be applied to both the purpose for multi-TB scheduling and the purpose for single-TB scheduling.

[Method G.2-3]

In order to provide scheduling information for a plurality of TBs when DCI skipping (DCI skipping) multi-TB scheduling is used, a search space and TB in a section where DCI omission can be maintained A search space candidate and a scheduling delay may be selected to be selected by the base station within a condition that the relative positions of the livers may be always the same. In this case, after the UE acquires DCI in the search space of a specific location, it may be assumed that in a section to which DCI omission is applied, the relative position of TB transmission to the search space is always fixed. At this time, the base station may determine the search space candidate and the scheduling delay value so that the relative position of the TB with respect to the search space is always fixed and transmit DCI. The proposed method has an advantage in that it can guarantee scheduling flexibility in which a base station can select a search space candidate according to a situation instead of always fixing the location where the TB is transmitted.

In the proposed method, the relative position between the search space and TB can be determined to be obtained by the UE through DCI decoding. This has the advantage that if the base station can adjust the transmission location of the TB, it allows this to increase scheduling flexibility. Alternatively, the relative position between the search space and the TB may be designated by the base station to be signaled in the configuration process of multi-TB scheduling. For example, when multi-TB scheduling is used for transmission of a single cell multicast traffic channel (SC-MTCH), a relative space between a search space of DCI and a TB for a SC-MTCH using a single cell multicast control channel (SC-MCCH) You can decide to set location information. In this case, the terminal has an advantage in that decoding performance can be improved by using a relation between a predetermined search space and a relative position between TBs as side information in a DCI decoding process. Alternatively, a value defined by the standard may be used as a relative position between the search space and TB used. For example, when multi-TB scheduling is used for the transmission of the SC-MTCH, the transmission location of the TB for the SC-MTCH is after a certain subframe based on the ending subframe of the DCI search space for the SC-MTCH. It can be fixed by appearing in. This method has the advantage of improving the signaling overhead of the base station and the decoding performance of the terminal, instead of giving up scheduling flexibility to adjust the scheduling delay.

23 schematically shows an example of the proposed method. In the example of the figure, regardless of the search space candidate used for DCI transmission, the location where TB is transmitted is always relative to the starting subframe (eg, d1) or ending subframe (eg, d2) of the search space. It is showing the action determined by. For example, referring to FIG. 23, a relative position (eg, d1 or d2) between a search space for multi-TB scheduling and a transport block (eg, TB1, TB2) may be set to be fixed. As described above, the fixed relative position is the relative between the start position of the search space for multi-TB scheduling (eg, start subframe) and the start position of the transport block (eg, TB1, TB2) (eg, start subframe). Position (e.g., d1) or relative position between the end position (e.g., end subframe) of the search space for multi-TB scheduling and the start position (e.g., start subframe) of the transport block (e.g., TB1, TB2) (Eg, d2). The base station may select a search space candidate and a scheduling delay so that relative positions between a search space for multi-TB scheduling and a transport block are the same, and then transmit a DCI indicating the selected scheduling delay through the selected search space candidate to the terminal. The UE may determine the location of the transport block based on the search space candidate receiving the DCI and the scheduling delay determined based on the DCI.

[Method G.2-4]

When multiple TBs can be scheduled using one DCI, such as multi-TB scheduling in a one-to-N mapping structure, multi-TB scheduling DCI is performed. The location of the search space for monitoring may be determined to be determined relative to the search space of another DCI. Specifically, the other DCI may be a single-TB scheduling DCI capable of scheduling the same TB as the multi-TB scheduling DCI. For example, in a network in which there are terminals capable of monitoring only a single-TB scheduling DCI, a DCI for supporting a new multi-TB scheduling terminal is introduced, and when the two types of terminals expect the same data, the base station For the purpose of not increasing the overhead due to TB transmission, different DCIs can be designated to schedule the same TB. The method proposed in this specification may be used as a method for efficiently arranging a search space in which a newly added multi-TB scheduling DCI is transmitted to support such a scheduling method.

As a specific method to support the method G.2-4, the location of the search space capable of transmitting the multi-TB scheduling DCI is relative to the search space for other purposes (eg, the search space where the single-TB scheduling is transmitted). You can decide to decide. As an example of a specific method, an ending subframe in which a search space in which a multi-TB scheduling DCI can be transmitted ends is determined as a position relative to a starting subframe in which a search space for another purpose starts. Can be decided. At this time, the relative positions may be determined such that the two search spaces are in contact with each other, or may be set to be separated by a predetermined size of a gap.

When the location of the search space in which the monitoring of the multi-TB scheduling DCI is performed is determined in the same manner as method G.2-4, the base station ends the subframe (or the starting subframe) of the search space for the multi-TB scheduling DCI. And information about the interval between the start subframes of the search space for the single-TB scheduling DCI may be transmitted through higher layer signaling. If the two search spaces exist adjacent to each other or if the size of the gap is determined by a standard, the upper layer signaling may not exist.

24 schematically shows an example of the proposed method. In the example of the figure, the location of the search space of the multi-TB scheduling DCI is determined as the position relative to the search space of the single-TB scheduling. In the example of the figure, if two search spaces are determined to be concatenated, the size of the gap has a value of zero. For example, referring to FIG. 24, it is assumed that a search space for multi-TB scheduling and a search space for single-TB scheduling are set for the same transport block. When the proposed method G.2-4 is applied in the example of FIG. 32, the location of the search space for multi-TB scheduling (eg, a start position or an end position) is different search space associated with a transport block (eg, single-TB scheduling It may be determined based on the location of the search space (for example, a starting location). More specifically, according to the proposed method G.2-4, the end position (eg, end subframe) of the search space for multi-TB scheduling is the start position (eg, start subframe) of the search space for single-TB scheduling. ) And gaps. Alternatively, the end position (eg, the end subframe) of the search space for multi-TB scheduling may be determined to be contiguous with the start position (eg, the start subframe) of the search space for single-TB scheduling (eg, the size of the gap) Is 0).

[Method G.2-5]

As in the method of G.2-4, the location of the search space for multi-TB scheduling DCI is relative to the search space for single-TB scheduling DCI. When determined by the location, the definition of a scheduling delay value for determining where the transmission of the TB scheduled by the multi-TB scheduling DCI starts is different from the scheduling delay value of the DCI scheduling the single-TB scheduling DCI. You can. To this end, the present invention proposes a method in which the start position of the TB transmission scheduled by the multi-TB scheduling DCI in the above structure is determined by the combination of the scheduling delay and Rmax specified by the DCI. At this time, the scheduling delay specified by the DCI may be determined by the number of subframes or an absolute time (millisecond, ms) as a value specified by the multi-TB scheduling DCI. In addition, the Rmax value is the size of the maximum repetitive transmission in which one DCI can be repeatedly transmitted and may be the same as the length of the search space (or the maximum length of the search space candidate). As a specific example of the proposed method, the terminal acquiring the multi-TB scheduling DCI is the length of the search space for the other single-TB scheduling (eg, Rmax) and the size of the gap in the scheduling delay value included in the obtained DCI. (If gaps are not included, gaps are not included.) By adding, it may be decided to determine the transmission time of TB. If it can be assumed that the search space of the single-TB scheduling and the search space of the multi-TB scheduling have the same target coverage, the Rmax value is the Rmax value of the search space where the multi-TB scheduling DCI is transmitted. Can be used.

As another form to which method G.2-5 can be applied, in a period in which a terminal expects a scheduled TB, it may be determined to determine a transmission time point of the TB based on another search space scheduling the same TB. For example, when a DCI only capable of single-TB scheduling and a DCI capable of multi-TB scheduling can schedule the same TB, the transmission time of TB designated by the multi-TB scheduling DCI is a search in which single-TB scheduling can be transmitted. It can be determined to be determined based on the space (or search space candidate). This is when a new terminal with the capability of multi-TB scheduling is added to a network in which a single-TB scheduling scheme is used, and data that can be commonly transmitted between the two exists (eg, SC-PTM, etc.). Multicast (multicast information) may be for the purpose of sharing the transmission of TB. In a specific method, the transmission time of the TB designated by the multi-TB scheduling DCI may be determined to be determined based on the search space of the other purpose (or a search space candidate belonging to the search space of the other purpose).

Subsequently, the transmission time of the TBs may be determined to be periodically transmitted based on the location of the first scheduled TB, or may be determined by using the search space (or search space candidate) and the first scheduled scheduling delay value for the other purpose. . The specific method can be used in combination with other methods proposed by the present invention.

25 schematically shows an example of the proposed method. In the example of the figure, the location of the search space of the multi-TB scheduling DCI is determined as the position relative to the search space of the single-TB scheduling. In addition, the multi-TB scheduling DCI shows the operation in which the transmission location of the scheduled TB is determined based on the search space of the single-TB scheduling DCI. For example, referring to FIG. 25, according to the proposed method G.2-4, the location of the search space for multi-TB scheduling is that of another search space associated with a transport block (eg, a search space for single-TB scheduling). It can be determined based on location. In this example, applying the proposed method G.2-5, the starting position of the transport block can be determined based on the scheduling delay (not shown) and Rmax specified by DCI, and the Rmax value is the maximum repetition for one DCI The number of times (or the maximum number of repetitions for DCI in the search space or the length of the search space) may be indicated. More specifically, as described above, the Rmax value may indicate the length of the search space for multi-TB scheduling or the maximum number of iterations for DCI in the search space for multi-TB scheduling. Alternatively, the Rmax value may indicate the length of the search space for single-TB scheduling or the maximum number of iterations for DCI in the search space for single-TB scheduling. As a more specific example, as illustrated in FIG. 25, the start position of a transport block (eg, TB 1) is determined by adding an Rmax value to a scheduling delay (not shown) specified by DCI for multi-TB scheduling, or multiple -It can be determined by adding the size of the gap and the Rmax value to the scheduling delay (not shown) specified by the DCI for TB scheduling.

[Method G.2-6]

As in the method G.2-4, the location of the search space for a multi-TB scheduling DCI is for a search space for a single-TB scheduling DCI. It is determined as a relative location, and when the transmission location of the TB is determined based on a search space (or search space candidate) for a single-TB scheduling DCI, as in the method G.2-5, specifically As a method for determining the transmission location of the TB, one of the methods proposed in the above method G.2-1, method G.2-2, or method G.2-3 can be used. Specifically, the terminal acquiring the multi-TB scheduling DCI is based on the search space (or search space candidate) monitored by the single-TB scheduling DCI scheduling the same TB, the method G.2-1, the method G.2-2, Alternatively, the transmission location of TB can be estimated by applying one of the methods proposed in Method G.2-3.

If the method G.2-1 is used, the base station can select a search space candidate for transmission of the single-TB scheduling DCI, and the terminal acquiring the multi-TB scheduling DCI can predict this, thereby increasing the scheduling flexibility of the base station. It has the advantage of being able to increase.

If the method G.2-2 is used, the base station can select a search space candidate for the transmission of a single-TB scheduling DCI under the same condition as the end subframe, and the terminal that acquires the multi-TB scheduling DCI is irrespective of this. It has an advantage in that it is possible to always determine the transmission time of TB based on the same search space candidate.

If the above method G.2-3 is used, the base station can freely select a search space candidate for transmission of a single-TB scheduling DCI under a condition that a predetermined TB transmission location can be expressed as a scheduling delay, and multi-TB scheduling The terminal having DCI has an advantage in that it can always determine the same transmission time regardless of this.

H. Communication system and apparatus to which the proposed methods of the present specification are applied

Without being limited thereto, various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts of the methods proposed in this document may be applied to various fields requiring wireless communication / connection (eg, 5G) between devices. have.

Hereinafter, with reference to the drawings will be illustrated in more detail. In the following drawings / description, the same reference numerals may exemplify the same or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise indicated.

26 illustrates a block diagram of a wireless communication device to which the proposed method of the present specification can be applied.

Referring to FIG. 26, the wireless communication system includes a base station 10 and a plurality of terminals 20 located within a base station area. The base station can be represented as a transmitting device, and the terminal can be represented as a receiving device, and vice versa. The base station and the terminal are a processor (processor, 11, 21), memory (memory, 14, 24), one or more transmit (Tx) / receive (Rx) RF module (radio frequency module, 15,25) (or RF transceiver), Tx processor (12,22), Rx processor (13,23), and antenna (16,26). The processor previously implements the salpin function, process and / or method. More specifically, in the downlink (DL) (communication from the base station to the terminal), upper layer packets from the core network are provided to the processor 11. The processor implements the functionality of the L2 layer. In the downlink (DL), the processor provides multiplexing between a logical channel and a transport channel and radio resource allocation to the terminal 20 and is responsible for signaling to the terminal. The transmit (TX) processor 12 implements various signal processing functions for the L1 layer (ie, physical layer). The signal processing function facilitates forward error correction (FEC) at the terminal and includes coding and interleaving. The coded and modulated symbols are divided into parallel streams, and each stream is mapped to an OFDM subcarrier, multiplexed with a reference signal (RS) in the time and / or frequency domain, and uses Inverse Fast Fourier Transform (IFFT). By combining them together, a physical channel carrying a time domain OFDMA symbol stream is generated. The OFDM stream is spatially precoded to produce a multiple spatial stream. Each spatial stream can be provided to a different antenna 16 through a separate Tx / Rx module (or transceiver, 15). Each Tx / Rx module can modulate the RF carrier with each spatial stream for transmission. In the terminal, each Tx / Rx module (or transceiver, 25) receives a signal through each antenna 26 of each Tx / Rx module. Each Tx / Rx module recovers information modulated with an RF carrier and provides it to a receiving (RX) processor 23. The RX processor implements various signal processing functions of layer 1. The RX processor may perform spatial processing on information to recover any spatial stream directed to the terminal. If multiple spatial streams are directed to the terminal, they can be combined into a single OFDMA symbol stream by multiple RX processors. The RX processor uses Fast Fourier Transform (FFT) to transform the OFDMA symbol stream from time domain to frequency domain. The frequency domain signal includes a separate OFDMA symbol stream for each subcarrier of the OFDM signal. The symbols and reference signals on each subcarrier are recovered and demodulated by determining the most probable signal placement points transmitted by the base station. These soft decisions may be based on channel estimates. Soft decisions are decoded and deinterleaved to recover the data and control signals originally transmitted by the base station on the physical channel. The corresponding data and control signals are provided to the processor 21.

The uplink (UL) (communication from the terminal to the base station) is processed in the base station 10 in a manner similar to that described in relation to the receiver function in the terminal 20. Each Tx / Rx module (or transceiver, 25) receives a signal through each antenna 26. Each Tx / Rx module provides RF carriers and information to the RX processor 23. The processor 21 can be associated with a memory 24 that stores program code and data. Memory can be referred to as a computer readable medium.

The proposed methods described above may be performed by the base station 10 and the terminal 20 which are the wireless communication devices described in FIG. 26.

27 illustrates a communication system 1 applied to the method proposed herein.

Referring to FIG. 27, the communication system 1 applied to the proposed method includes a wireless device, a base station and a network. Here, the wireless device means a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device. Although not limited to this, the wireless device includes a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a hand-held device 100d, and a home appliance 100e. ), Internet of Thing (IoT) devices 100f, and AI devices / servers 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (eg, a drone). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, Head-Mounted Device (HMD), Head-Up Display (HUD) provided in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, or the like. The mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a notebook, etc.). Household appliances may include a TV, a refrigerator, and a washing machine. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may also be implemented as wireless devices, and the specific wireless device 200a may operate as a base station / network node to other wireless devices.

The wireless devices 100a to 100f may be connected to the network 300 through the base station 200. AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 through the network 300. The network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 100a to 100f may communicate with each other through the base station 200 / network 300, but may also directly communicate (eg, sidelink communication) without passing through the base station / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (eg, Vehicle to Vehicle (V2V) / Vehicle to everything (V2X) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensor) or other wireless devices 100a to 100f.

Wireless communication / connections 150a, 150b, and 150c may be achieved between the wireless devices 100a to 100f / base station 200 and the base station 200 / base station 200. Here, the wireless communication / connection is various wireless such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, IAB (Integrated Access Backhaul)). It can be achieved through access technology (eg, 5G NR), and wireless devices / base stations / wireless devices, base stations and base stations can transmit / receive radio signals to each other through wireless communication / connections 150a, 150b, and 150c. For example, the wireless communication / connection 150a, 150b, 150c may transmit / receive signals through various physical channels.To this end, based on various proposals herein, the wireless signal transmission / reception is performed. At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.) and resource allocation processes may be performed.

28 illustrates a wireless device that can be applied to the proposed method of the present specification.

Referring to FIG. 28, the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} are {wireless devices 100a to 100f, base station 200} and / or {wireless devices 100a to 100f) in FIG. Devices 100a to 100f}.

The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 controls the memory 104 and / or transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate the first information / signal, and then transmit the wireless signal including the first information / signal through the transceiver 106. In addition, the processor 102 may receive the wireless signal including the second information / signal through the transceiver 106 and store the information obtained from the signal processing of the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 is an instruction to perform some or all of the processes controlled by the processor 102, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 106 can be coupled to the processor 102 and can transmit and / or receive wireless signals through one or more antennas 108. The transceiver 106 may include a transmitter and / or receiver. The transceiver 106 may be mixed with a radio frequency (RF) unit. In the present specification, the wireless device may mean a communication modem / circuit / chip.

The second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 controls the memory 204 and / or transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signal, and then transmit a wireless signal including the third information / signal through the transceiver 206. In addition, the processor 202 may receive the wireless signal including the fourth information / signal through the transceiver 206 and store the information obtained from the signal processing of the fourth information / signal in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 is an instruction to perform some or all of the processes controlled by the processor 202, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 206 can be coupled to the processor 202 and can transmit and / or receive wireless signals through one or more antennas 208. Transceiver 206 may include a transmitter and / or receiver. Transceiver 206 may be mixed with an RF unit. In the present specification, the wireless device may mean a communication modem / circuit / chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. Without being limited to this, one or more protocol layers may be implemented by one or more processors 102 and 202. For example, one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or more processors 102 and 202 may include one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can be created. The one or more processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. The one or more processors 102, 202 generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein. , To one or more transceivers 106, 206. One or more processors 102, 202 may receive signals (eg, baseband signals) from one or more transceivers 106, 206, and descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein Depending on the field, PDU, SDU, message, control information, data or information may be acquired.

One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 can be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) May be included in one or more processors 102, 202. Descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein are either firmware or software set to perform or are stored in one or more processors 102, 202 or stored in one or more memories 104, 204. It can be driven by the above processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, instructions and / or sets of instructions.

The one or more memories 104, 204 may be coupled to one or more processors 102, 202, and may store various types of data, signals, messages, information, programs, codes, instructions, and / or instructions. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located inside and / or outside of the one or more processors 102, 202. Also, the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as a wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, control information, radio signals / channels, and the like referred to in the methods and / or operational flowcharts of this document to one or more other devices. The one or more transceivers 106, 206 may receive user data, control information, radio signals / channels, and the like referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein from one or more other devices. have. For example, one or more transceivers 106, 206 may be connected to one or more processors 102, 202, and may transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. In addition, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208, and one or more transceivers 106, 206 may be described, functions described herein through one or more antennas 108, 208. , May be set to transmit and receive user data, control information, radio signals / channels, and the like referred to in procedures, proposals, methods, and / or operational flowcharts. In this document, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). The one or more transceivers 106 and 206 use the received radio signal / channel and the like in the RF band signal to process the received user data, control information, radio signal / channel, and the like using one or more processors 102 and 202. It can be converted to a baseband signal. The one or more transceivers 106 and 206 may convert user data, control information, and radio signals / channels processed using one or more processors 102 and 202 from a baseband signal to an RF band signal. To this end, the one or more transceivers 106, 206 may include (analog) oscillators and / or filters.

29 shows another example of a wireless device applied to the proposed method of the present specification. The wireless device may be implemented in various forms according to use-example / service (see FIG. 27).

Referring to FIG. 29, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 28, and various elements, components, units / units, and / or modules ). For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit may include a communication circuit 112 and a transceiver (s) 114. For example, the communication circuit 112 can include one or more processors 102,202 and / or one or more memories 104,204 in FIG. For example, the transceiver (s) 114 may include one or more transceivers 106,206 and / or one or more antennas 108,208 of FIG. 28. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls various operations of the wireless device. For example, the controller 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (eg, another communication device) through the wireless / wired interface through the communication unit 110 or externally (eg, through the communication unit 110). Information received through a wireless / wired interface from another communication device) may be stored in the memory unit 130.

The additional element 140 may be variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (FIGS. 27, 100A), vehicles (FIGS. 27, 100B-1, 100B-2), XR devices (FIGS. 27, 100C), portable devices (FIGS. 27, 100D), and household appliances. (Fig. 27, 100e), IoT device (Fig. 27, 100f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environment device, It may be implemented in the form of an AI server / device (FIGS. 27 and 400), a base station (FIGS. 27 and 200), and a network node. The wireless device may be movable or used in a fixed place depending on the use-example / service.

In FIG. 29, various elements, components, units / parts, and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least some of them may be connected wirelessly through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130 and 140) are connected through the communication unit 110. It can be connected wirelessly. Further, each element, component, unit / unit, and / or module in the wireless devices 100 and 200 may further include one or more elements. For example, the controller 120 may be composed of one or more processor sets. For example, the control unit 120 may include a set of communication control processor, application processor, electronic control unit (ECU), graphic processing processor, and memory control processor. In another example, the memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory (non- volatile memory) and / or combinations thereof.

Hereinafter, the implementation example of FIG. 29 will be described in more detail with reference to the drawings.

30 illustrates a mobile device applied to the method proposed herein. The portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a notebook, etc.). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

Referring to FIG. 30, the mobile device 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. ). The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130/140 in FIG. 29, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations. The controller 120 may perform various operations by controlling the components of the mobile device 100. The controller 120 may include an application processor (AP). The memory unit 130 may store data / parameters / programs / codes / commands necessary for driving the portable device 100. Also, the memory unit 130 may store input / output data / information. The power supply unit 140a supplies power to the portable device 100 and may include a wired / wireless charging circuit, a battery, and the like. The interface unit 140b may support the connection between the mobile device 100 and other external devices. The interface unit 140b may include various ports (eg, audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c may receive or output image information / signal, audio information / signal, data, and / or information input from a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

For example, in the case of data communication, the input / output unit 140c acquires information / signal (eg, touch, text, voice, image, video) input from the user, and the obtained information / signal is transmitted to the memory unit 130 Can be saved. The communication unit 110 may convert information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to other wireless devices or to a base station. In addition, after receiving a radio signal from another wireless device or a base station, the communication unit 110 may restore the received radio signal to original information / signal. After the restored information / signal is stored in the memory unit 130, it can be output in various forms (eg, text, voice, image, video, heptic) through the input / output unit 140c.

31 illustrates a vehicle or an autonomous vehicle applied to the method proposed herein. Vehicles or autonomous vehicles can be implemented as mobile robots, vehicles, trains, aerial vehicles (AVs), ships, and the like.

Referring to FIG. 31, the vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and autonomous driving. It may include a portion (140d). The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110/130 / 140a-140d correspond to blocks 110/130/140 in FIG. 29, respectively.

The communication unit 110 may transmit / receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, a base station (eg, a base station, a road side unit, etc.) and a server. The controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The controller 120 may include an electronic control unit (ECU). The driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel on the ground. The driving unit 140a may include an engine, a motor, a power train, wheels, brakes, and steering devices. The power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100 and may include a wired / wireless charging circuit, a battery, and the like. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like. The sensor unit 140c includes an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, and a vehicle forward / Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, and the like. The autonomous driving unit 140d maintains a driving lane, automatically adjusts speed, such as adaptive cruise control, and automatically moves along a predetermined route, and automatically sets a route when a destination is set. Technology, etc. can be implemented.

For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The control unit 120 may control the driving unit 140a so that the vehicle or the autonomous vehicle 100 moves along the autonomous driving path according to a driving plan (eg, speed / direction adjustment). During autonomous driving, the communication unit 110 may acquire the latest traffic information data non-periodically from an external server, and may acquire surrounding traffic information data from nearby vehicles. Also, during autonomous driving, the sensor unit 140c may acquire vehicle status and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit 110 may transmit information regarding a vehicle location, an autonomous driving route, and a driving plan to an external server. The external server may predict traffic information data in advance using AI technology or the like based on the information collected from the vehicle or autonomous vehicles, and provide the predicted traffic information data to the vehicle or autonomous vehicles.

The embodiments described above are those in which the components and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to configure an embodiment of the present invention by combining some components and / or features. The order of the operations described in the embodiments of the present invention can be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that the claims may be combined with claims that do not have an explicit citation relationship in the claims, or may be included as new claims by amendment after filing.

It is apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the characteristics of the present invention. Accordingly, the above detailed description should not be construed as limiting in all respects, but should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

The present invention can be applied to wireless communication devices such as 3GPP LTE / LTE-A system / 5G system (or NR (New RAT) system) as well as terminals and base stations operating in various wireless communication systems.

Claims (13)

1. A method for a user equipment to receive a downlink signal in a wireless communication system,

   Receiving downlink control information (DCI) in a search space for multiple transport block scheduling; And

   And receiving a transport block based on the received DCI,

   The method is set such that a relative position between the search space for the multiple transport block scheduling and the transport block is fixed.
2. The method according to claim 1,

   A method for obtaining information on a relative position between a search space for the multiple transport block scheduling and the transport block through the DCI.
3. The method according to claim 1,

   Further comprising the step of receiving the configuration (configuration) information for multiple transport block scheduling,

   The information about the search space for the multiple transport block scheduling and the relative position between the transport blocks is obtained through configuration information for the multiple transport block scheduling.
4. The method according to claim 1,

   A method in which a relative position between a search space for the multiple transport block scheduling and the transport block has a predefined value.
5. The method according to claim 1,

   The relative position between the search space for the multiple transport block scheduling and the transport block is a relative position between the start position of the search space and the start position of the transport block.
6. The method according to claim 1,

   The relative position between the search space for the multiple transport block scheduling and the transport block is a relative position between the end position of the search space and the start position of the transport block.
7. The method according to claim 1,

   The starting position of the transport block is determined based on the scheduling delay and Rmax specified by the DCI,

   Rmax represents the length of the search space for single transport block scheduling associated with the transport block.
8. The method according to claim 7,

   The start position of the transport block is determined by adding the value of Rmax to a scheduling delay specified by the DCI.
9. The method according to claim 7,

   The starting position of the transport block is determined by adding the value of Rmax and the size of a gap to a scheduling delay specified by the DCI.
10. The method according to claim 1,

    The starting position of the transport block is determined based on the scheduling delay and Rmax specified by the DCI,

    Rmax represents the length of the search space for the multiple transport block scheduling.
11. The method according to claim 10,

    The start position of the transport block is determined by adding the value of Rmax to a scheduling delay specified by the DCI.
12. The method according to claim 10,

    The starting position of the transport block is determined by adding the value of Rmax and the size of a gap to a scheduling delay specified by the DCI.
13. A user equipment configured to receive a signal in a wireless communication system, the user equipment comprising:

    A radio frequency (RF) transceiver; And

    And a processor connected operatively with the RF transceiver,

    The processor controls the RF transceiver:

    Downlink control information (DCI) is received in a search space for multiple transport block scheduling,

    It is configured to receive a transport block (transport block) based on the received DCI,

    The terminal is set so that a relative position between the search space for the multiple transport block scheduling and the transport block is fixed.

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