WO2020032643A1 - Method for transmitting and receiving signal in wireless communication system and apparatus therefor - Google Patents

Abstract

The present invention relates to a method for transmitting and receiving a signal to and from a communication apparatus configured to operate in a first system in a radio resource control (RRC) connected mode and an apparatus therefor and, more particularly, to a method comprising the steps of: receiving, from a base station, configuration information for a specific channel of a second system; receiving the specific channel from the second system on the basis of the configuration information in a RRC idle mode; and performing a random access procedure in the first system or the second system in response to the received specific channel, and an apparatus therefor.

Description

Method for transmitting and receiving signals in a 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 a signal or a channel according to a terminal type.

Mobile communication systems have been developed to provide voice services while ensuring user activity. However, the mobile communication system has expanded not only voice but also data service.As a result of the explosive increase in traffic, shortage of resources and users demand faster services, a more advanced mobile communication system is required. .

The requirements of the next generation of mobile communication systems can support the massive explosive data traffic, the dramatic increase in transmission rate per user, the large increase in the number of connected devices, the very low end-to-end latency, and the high energy efficiency. It should be possible. For this purpose, Dual Connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Wide 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 a signal according to a terminal type.

It is also an object of the present invention to provide a method and an apparatus therefor for efficiently transmitting and receiving a paging signal or channel.

Another object of the present invention is to provide a method and apparatus for efficiently mapping physical resources when a channel status information reference signal (CSI-RS) is set.

Another object of the present invention is to provide an efficient CSI-RS configuration method and apparatus therefor for non-BL (Band reduced and Low cost) user equipment (UE) operating in a coverage extension or enhancement (CE) mode. .

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

In a first aspect of the invention, there is provided a method for receiving a signal by a user equipment (UE) configured to operate in a first system in a radio resource control (RRC) connected mode. Receiving from the configuration information for a particular channel of the second system from; Receiving the specific channel in the second system based on the configuration information in an RRC idle mode; And performing a random access procedure in the first system or the second system in response to the received specific channel.

In a second aspect of the present invention, there is provided a user equipment configured to operate in a first system in an RRC connected mode, comprising: a radio frequency (RF) transceiver; And a processor operatively connected to the RF transceiver, wherein the processor controls the RF transceiver to receive configuration information for a specific channel of a second system from a base station, and in an RRC idle mode. The second system may be configured to receive the specific channel based on the configuration information and perform a random access procedure in the first system or the second system in response to the received specific channel.

In a third aspect of the invention, there is provided an apparatus for a user equipment configured to operate in a first system in an RRC connected mode, the apparatus comprising: a memory comprising executable code; And a processor coupled to the memory in operation, wherein the processor is configured to execute the executable code to perform specific operations, wherein the specific operations receive configuration information for a specific channel of a second system from a base station. And receiving the specific channel in the second system based on the configuration information in an RRC idle mode, and randomly in the first system or the second system in response to the received specific channel. Performing a connection procedure.

Preferably, setting information for a specific channel of the second system may be received at the first system.

Advantageously, performing the random access procedure comprises: determining a system to operate after detection of the particular channel among the first system and the second system based on the information received through the particular channel; The system may include performing the random access procedure.

Advantageously, information indicating a system to operate after detection of said particular channel may be received at said first system, and performing said random access procedure includes performing said random access procedure at said indicated system. can do.

Advantageously, performing the random access procedure includes determining a system to operate after detection of the particular channel, sending a request for the determined system to the base station, and accepting the request from the base station. May include receiving.

More preferably, information necessary to operate in the determined system may be received from the base station.

More preferably, the request may be sent via a random access preamble.

More preferably, the request may be sent via uplink transmission for a random access response.

Preferably, the specific channel may be a paging channel.

Preferably, the second system may be a system configured to support repetitive transmission for coverage extension or coverage enhancement, and the first system may be a system not configured to support repetitive transmission for coverage extension. .

Preferably, the second system is a system configured to operate in a narrowband, and the first system may be a system configured to operate in a wideband.

Preferably, configuration information for a specific channel of the second system may be received upon RRC connection release in the first system.

According to the present invention, there is provided a method for efficiently transmitting and receiving a signal according to a terminal type and an apparatus therefor.

Further, according to the present invention, it is possible to efficiently transmit and receive a paging signal or channel.

In addition, according to the present invention, when a CSI-RS (channel status information reference signal) is set, physical resources can be efficiently mapped.

In addition, according to the present invention, CSI-RS can be efficiently set for a non-BL (Band reduced and Low cost) user equipment (UE) operating in a coverage extension or enhancement (CE) mode.

The effect obtained in the present invention is 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. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide embodiments of the present invention and together with the description, describe the technical features of the present invention.

1 shows an example of a 3GPP LTE system structure.

2 is a diagram illustrating an example of a 3GPP NR system structure.

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

4 illustrates a random access procedure.

5 illustrates an LTE radio frame structure.

6 illustrates a slot structure of an LTE frame.

7 illustrates a structure of a downlink subframe of an LTE system.

8 illustrates a structure of an uplink subframe used in LTE.

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

10 illustrates a slot structure of an NR frame.

11 illustrates the structure of a self-contained slot.

12 illustrates cell coverage enhancement in MTC.

13 illustrates a signal band for MTC.

14 illustrates scheduling in legacy LTE and MTC.

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

16 illustrates a network initial access and subsequent communication process in an NR system.

17 illustrates preamble transmission on an NB-IoT RACH.

18 illustrates a DRX cycle for discontinuous reception of a PDCCH.

19 illustrates a DRX cycle for paging.

20 illustrates an extended DRX (eDRX) cycle.

21 to 23 illustrate a flowchart of a method for transmitting and receiving a signal between a terminal and a base station according to the proposal of the present invention.

24 to 29 illustrate a system and a communication device to which the methods proposed in the present invention can be applied.

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

The techniques 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 Universal Terrestrial Radio Access (UTRA) 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 in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), or the like. 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 evolution of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) or 5G is an evolution of 3GPP LTE / LTE-A / LTE-A pro.

For clarity, the description will be based on 3GPP communication systems (eg, LTE-A, NR), but the technical spirit of the present invention is not limited thereto. LTE refers to technology after 3GPP TS (Technical Specification) 36.xxx Release 8. In detail, the LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and the LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP 5G means technology after TS 36.xxx Release 15, and 3GPP NR means 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 collectively referred to as 3GPP system. Background, terminology, abbreviations, and the like used in the description of the present invention may refer to the matters described in the standard documents published prior to the present invention. For example, see the following document:

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

A system architecture

1 shows an example of a 3GPP LTE system structure.

E-UTRAN (evolved-UMTS terrestrial radio access network) or LTE (long term evolution) / LTE-A / LTE-A Pro / 5G system may be collectively referred to as LTE system. Referring to FIG. 1, an E-UTRAN includes at least one base station (eg, BS) 20 that provides a control plane and a user plane to a terminal (eg, a UE) 10. The UE 10 may be fixed or mobile and may be referred to in other terms, such as mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), wireless device, and the like. BS 20 is generally a fixed station that communicates with UE 10. Other terms such as evolved Node-B (eNB), General Node-B (gNB), base transceiver system (BTS), access point (AP), etc. It may be referred to as. BSs are interconnected via an X2 interface. BSs are also connected to an evolved packet core (EPC) via an S1 interface, more specifically to a mobility management entity (MME) via S1-MME, and to a serving gateway (S-GW) via S1-U. EPCs include MME, S-GW and packet data network-gateway (P-GW). The layer of the air interface protocol between the UE and the network uses the first layer (L1), second layer (L2) and third layer (L3) models based on the lower three layers of Open System Interconnection (OSI), which are well known in communication systems. Can be classified using. Among them, the physical layer (PHY) belonging to the first layer provides an information transmission service using a physical channel, and the RRC (Radio Resource Control) layer belonging to the third layer controls radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the base station.

2 is a diagram illustrating an example of a 3GPP NR system structure.

Referring to FIG. 2, the NG-RAN consists of gNBs that provide control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and user equipment (UE). do. The gNBs are interconnected via an Xn interface. The gNB is also connected to the NGC via an NG interface. More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.

B. Physical Channels and Frame Structures

Physical channel and general signal transmission

3 illustrates physical channels and general signal transmission used in a 3GPP system. 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 between 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 transmitted and received.

When the power is turned off while the power is turned off, or a new terminal enters a cell, an initial cell search operation such as synchronization with a base station is performed (S11). To this end, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station, synchronizes with the base station, and acquires information such as a cell identity. In addition, the terminal may receive a broadcast broadcast (PBCH) from the base station to obtain broadcast information in the cell. In addition, the UE may check the downlink channel state by receiving a DL RS (Downlink Reference Signal) in the initial cell search step.

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

Thereafter, the terminal may perform a random access procedure (for example, see FIG. 4 and related description) to complete the access to the base station (S13 to S16). In more detail, 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 PDSCH corresponding thereto (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 a PDCCH and a PDSCH corresponding thereto (S16).

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

4 illustrates a random access procedure.

The random access procedure may include an initial access in RRC Idle Mode (or RRC_IDLE state), an initial access after a radio link failure, a handover requiring a random access process, an RRC Connected Mode (or RRC_CONNECTED state). ) Is performed when uplink / downlink data is generated that requires a random access procedure. The random access process may be referred to as a random access channel (RACH) process. Some RRC messages, such as an RRC connection request message, a cell update message, and an URA update message, are also transmitted using a random access procedure. The logical channels Common Control Channel (CCCH), Dedicated Control Channel (DCCH), and Dedicated Traffic Channel (DTCH) may be mapped to the transport channel RACH. The transport channel RACH is mapped to a 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 and transmits the PRACH preamble in uplink. The random access process is classified into a contention based process and a non-contention based process.

Referring to FIG. 4, the terminal receives and stores information about a random access from a base station through system information. After that, 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 a 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). In detail, downlink scheduling information on the random access response message may be CRC masked by a random access-RNTI (RA-RNTI) and transmitted on an L1 / L2 control channel (PDCCH). Upon receiving the downlink scheduling signal masked with the RA-RNTI, the UE may receive and decode a random access response message from a physical downlink shared channel (PDSCH). Thereafter, the terminal checks whether the random access response information includes random access response information indicated to the terminal. Whether the random access response information indicated to the presence of the self may be determined by whether there is a random access preamble (RAID) for the preamble transmitted by the terminal. The random access response information includes a 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. When the terminal receives the random access response information, uplink transmission including an RRC connection request message on an uplink shared channel according to radio resource allocation information included in the response information (also referred to as message 3 or Msg3). Perform (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 completes the connection setup and transmits a connection setup complete message (also called message 5 or Msg5) to the base station (S25).

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

Radio frame structure

5 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 PCell (Primary Cell), up to 31 SCells (Secondary Cells) may be aggregated. Unless specifically stated, the operations described herein may be applied independently for each cell. In multi-cell merging, different frame structures can be used for different cells. In addition, time resources (eg, subframes, slots, and subslots) in the frame structure may be collectively referred to as a time unit (TU).

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

The subframe may be defined as one or more slots according to SCS (Subcarrier Spacing) as follows.

For SCS = 7.5 kHz or 15 kHz, subframe #i is defined as two 0.5ms slots # 2i and # 2i + 1 (i = 0-9).

When SCS = 1.25 kHz, subframe #i is defined as one 1ms slot # 2i.

When SCS = 15 kHz, subframe #i may be defined as six subslots.

5B illustrates frame type 2. FIG. Frame type 2 consists 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 the UL-Downlink configuration. The subframe consists of two slots.

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

6 illustrates a slot structure of an LTE frame.

Referring to FIG. 6, a slot includes a plurality of symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. The symbol may mean a symbol section. The slot structure 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 represents the number of RBs in the downlink slot, and N ^UL _RB represents the number of _RBs in the UL slot. N ^DL _RB and N ^UL _RB depend on the DL 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 the RB. The number of symbols in the slot can be variously changed according to the length of the SCS, CP. For example, one slot includes 7 symbols in the case of a normal CP, but one slot includes 6 symbols in the case of an extended CP.

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

7 illustrates a structure of a downlink subframe of an LTE system.

Referring to FIG. 7, 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) symbols correspond to the data region to which the 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), a Physical Hybrid ARQ Indicator Channel (PHICH), and the like. The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information on the number of OFDM symbols used for transmission of a control channel within the subframe. The PHICH 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). DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain group of terminals.

8 illustrates a structure of an uplink subframe used in LTE.

Referring to FIG. 8, the subframe 700 is composed of two 0.5 ms slots 701. Each slot is composed of a plurality of symbols 702 and one symbol corresponds to one SC-FDMA symbol. The RB 703 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain. The structure of an uplink subframe of LTE is largely divided into a data region 704 and a control region 705. The data area means a communication resource used in transmitting data such as voice and packet transmitted to each terminal, and includes a PUSCH (Physical Uplink Shared Channel). The control region means a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each user equipment, a reception ACK / NACK for the downlink signal, an uplink scheduling request, and a PUCCH (Physical Uplink). Control Channel). The sounding reference signal (SRS) is transmitted through the SC-FDMA symbol which is located last on the time axis in one subframe.

9 illustrates a 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 1 ms subframes (SFs). The subframe is divided into one or more slots, and the number of slots in the subframe depends on the subcarrier spacing (SCS). Each slot includes 12 or 14 OFDM (A) symbols according to a cyclic prefix (CP). When a normal CP is used, each slot includes 14 symbols. If extended CP is used, each slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or DFT-s-OFDM symbol).

Table 1 exemplarily shows that when 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.

* 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 ^subframe

Table 2 illustrates that when the 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 the NR system, OFDM (A) numerology (eg, SCS, CP length, etc.) may be set differently among a plurality of cells merged into one UE. Accordingly, the (absolute time) section of a time resource (eg, SF, slot, or TTI) (commonly referred to as a time unit (TU) for convenience) composed of the same number of symbols may be set differently between merged cells.

10 illustrates a slot structure of an NR frame.

The slot includes a plurality of symbols in the time domain. For example, in general, one slot includes 14 symbols in case of CP, but one slot includes 12 symbols in case of extended CP. The carrier includes a plurality of subcarriers in the frequency domain. RB (Resource Block) is defined as a plurality of consecutive subcarriers (eg, 12) in the frequency domain. A bandwidth part (BWP) is defined as a plurality of consecutive (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 an activated BWP, and only one BWP may be activated by one UE. Each element in the resource grid is referred to as a resource element (RE), one complex symbol may be mapped.

11 illustrates the structure of a self-contained slot.

In an NR system, a frame is characterized by a self-complete structure in which all of a DL control channel, DL or UL data, UL control channel, etc. may be included in one slot. For example, the first N symbols in a slot may be used to transmit a DL control channel (referred to as DL control region), and the last M symbols in a slot may be used to transmit a UL control channel (referred to as UL control region). N and M are each an integer of 0 or more. A resource region (referred to as a data region) between the DL control region and the UL control region may be used for DL data transmission or may be used for UL data transmission. As an example, the following configuration may be considered. Each interval is listed in chronological order.

1.DL only configuration

2. UL only configuration

3. Mixed UL-DL composition

DL area + Guard Period (GP) + UL control area

DL control area + GP + UL area

DL area: (i) DL data area, (ii) DL control area + DL data area

UL region: (i) UL data region, (ii) UL data region + UL control region

The PDCCH may be transmitted in the DL control region, and the PDSCH may be transmitted in the DL data region. PUCCH may be transmitted in the UL control region, and PUSCH may be transmitted in the UL data region. Downlink Control Information (DCI), for example, DL data scheduling information, UL data scheduling information, and the like may be transmitted in the PDCCH. In PUCCH, uplink control information (UCI), for example, positive acknowledgment / negative acknowledgment (ACK / NACK) information, channel state information (CSI) information, and scheduling request (SR) for DL data may be transmitted. The GP provides a time gap in the process of the base station and the terminal switching from the transmission mode to the reception mode or from the reception mode to the transmission mode. Some symbols at the time of switching from DL to UL in the subframe may be set to GP.

C. 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)

The 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 (QAM), 64 QAM, and 256 QAM are used. Apply. A codeword is generated by encoding the TB. The PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword are mapped to one or more layers. Each layer is mapped to a resource together with a DMRS (Demodulation Reference Signal) to generate an OFDM symbol signal, and is 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, 16 CCEs (Control Channel Elements) according to an aggregation level (AL). One CCE consists 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 REG set with a given pneumonology (eg SCS, CP length, etc.). A plurality of CORESET for one terminal may be overlapped 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. In detail, the number of RBs and the number of symbols (up to three) constituting the CORESET may be set by higher layer signaling.

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

controlResourceSetId indicates the control resource set associated with the search space set

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

Table 3 illustrates the features of each search space type.

Table 4 illustrates the DCI formats transmitted on the PDCCH.

DCI format 0_0 is used for scheduling TB-based (or TB-level) PUSCH, DCI format 0_1 is used for scheduling TB-based (or TB-level) PUSCH or Code Block Group (CBG) -based (or CBG-level) PUSCH. It can be used to schedule. DCI format 1_0 is used for scheduling TB-based (or TB-level) PDSCH, DCI format 1_1 is used for scheduling 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 UE, and DCI format 2_1 is used to deliver downlink pre-Emption information to the UE. DCI format 2_0 and / or DCI format 2_1 may be delivered to UEs in a corresponding group through a group common 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 uses a Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform. Or based on a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the terminal transmits the PUSCH by applying transform precoding. For example, when transform precoding is not possible (eg, transform precoding is disabled), the UE transmits a PUSCH based on a CP-OFDM waveform, and when conversion precoding is possible (eg, transform precoding is enabled), the UE is CP-OFDM. PUSCH may be transmitted based on the waveform or the DFT-s-OFDM waveform. PUSCH transmissions are dynamically scheduled by UL grants in DCI or semi-static based on higher layer (eg RRC) signaling (and / or Layer 1 (L1) signaling (eg PDCCH)). Can be scheduled (configured grant). PUSCH transmission may be performed based on codebook or non-codebook.

(2) physical uplink control channel (PUCCH)

The 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 the PUCCH formats.

D. Machine Type Communication (MTC)

MTC is a form of data communication that includes one or more machines, and may be applied to machine-to-machine (M2M) or Internet-of-Things (IoT). Here, a machine refers to an object that does not require human direct manipulation or intervention. For example, the machine may include a smart meter equipped with a mobile communication module, a bending machine, a portable terminal having an MTC function, and the like. For example, MTC can provide services such as meter reading, water level measurement, the use of surveillance cameras, and inventory reporting of vending machines. MTC communication has a characteristic of small amount of transmission data and occasional up / down link data transmission and reception. Therefore, it is efficient to lower the cost of the MTC device and reduce the battery consumption at the low data rate. MTC devices are generally less mobile, and thus MTC communication has the characteristic that the channel environment hardly changes.

In 3GPP, MTC has been applied since release 10 and can be implemented to meet 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, for which UE category 0 is defined. The UE category is an index indicating how much data the terminal can process in the communication modem. UE category 0 can reduce baseband / RF complexity by using a reduced peak data rate, half-duplex operation with relaxed Radio Frequency (RF) requirements, and a single receive antenna. In 3GPP Release 12, enhanced MTC (eMTC) was introduced, and the MTC terminal lowered the cost and power consumption by only operating at 1.08MHz (that is, 6 RBs), which is the minimum frequency bandwidth supported by legacy LTE.

The content described herein is mainly applicable to the features related to eMTC, but can also be applied to MTC to be applied to MTC, eMTC, 5G (or NR) unless otherwise specified. In the present specification, for convenience of description, the description will be collectively referred to as MTC.

12 illustrates cell coverage enhancement in MTC. Coverage enhancement may be referred to as coverage extension, and the techniques for coverage enhancement described with respect to MTC may apply equally or similarly to NB-IoT and 5G (or NR).

Various cell coverage extension techniques are 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 a plurality of occasions (bundle of physical channels). In the bundle interval, the physical channel / signal may be repeatedly transmitted / received according to a pre-defined rule. The receiving device can increase the decoding success rate of the physical channel / signal by decoding part or all of the physical channel / signal bundle. In this case, the opportunity may refer to a resource (eg, time / frequency) to which a physical channel / signal may 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, 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 may be repeatedly transmitted / received.

The MTC supports an operation mode for coverage enhancement or coverage (CE), and a mode supporting repetitive transmission / reception of signals for coverage enhancement or extension may be referred to as a CE mode. The number of repetitive transmissions / receptions of a signal for coverage enhancement or extension may be referred to as a CE level Table 6 exemplifies a CE mode / level supported by the MTC.

The first mode (eg, CE Mode A) is defined for small coverage enhancement with full mobility and channel state information (CSI) feedback, and is a mode with no or few 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 in extremely poor coverage conditions that support CSI feedback and limited mobility, and a large number of repetitive transmissions are defined. The second mode provides up to 15dB of coverage enhancement based on the range of UE category 1. Each level of the MTC is defined differently in a random access procedure (or RACH procedure) and a paging procedure.

13 illustrates a signal band for MTC.

Referring to FIG. 13, as a method for lowering the unit cost of an MTC terminal, the MTC is a specific band (or channel band) of the system bandwidth of the cell (MTC subband or narrow band) regardless of the system bandwidth of the cell. Narrowband (NB) only). For example, the uplink / downlink operation of the MTC terminal may be performed only in the 1.08 MHz frequency band. 1.08 MHz corresponds to six consecutive Physical Resource Blocks (PRBs) in an LTE system, and is defined to follow the same cell search and random access procedure as that of an LTE terminal. FIG. 13A illustrates a case in which MTC subbands are configured in the center of a cell (eg, six center PRBs) and FIG. 13B illustrates a case in which a plurality of MTC subbands are configured in a cell. The plurality of MTC subbands may be configured continuously or discontinuously in the frequency domain. Physical channels / signals for the MTC may be transmitted and received on one MTC subband. In the NR system, the MTC subband may be defined in consideration of 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 (that is, 0.18 * X * (2 ^ μ) MHz bandwidths) (μ may refer to Table 1). 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 may operate in at least one bandwidth part (BWP). In this case, a plurality of MTC subbands may be configured in the BWP.

14 illustrates scheduling in legacy LTE and MTC.

Referring to FIG. 14, in legacy LTE, a PDSCH is scheduled using a PDCCH. Specifically, the PDCCH may be transmitted in the first N OFDM symbols in a subframe (N = 1 to 3), and the PDSCH scheduled by the PDCCH is transmitted in the same subframe. Meanwhile, in MTC, PDSCH is scheduled using MPDCCH. Accordingly, the MTC terminal may monitor the MPDCCH candidate in a search space in a subframe. Here, monitoring includes blind decoding MPDCCH candidates. The MPDCCH transmits a DCI, and the DCI includes uplink or downlink scheduling information. MPDCCH is multiplexed into PDSCH and FDM in a subframe. The MPDCCH is repeatedly transmitted in a maximum of 256 subframes, and the DCI transmitted by the 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, transmission of PDSCH scheduled by the MPDCCH starts in subframe # N + 2. The PDSCH may be repeatedly transmitted in up to 2048 subframes. MPDCCH and PDSCH may be transmitted in different MTC subbands. Accordingly, the MTC terminal may perform RF (Radio Frequency) retuning for PDSCH reception after MPDCCH reception. In the case of uplink scheduling, when repetitive transmission of the MPDCCH ends in subframe #N, the PUSCH scheduled by the MPDCCH starts transmission in subframe # N + 4. When repetitive transmission is applied to a physical channel, frequency hopping is supported between different MTC subbands by RF retuning. For example, if 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 is transmitted in the second MTC subband in the remaining 16 subframes. Can be sent. MTC operates in half duplex mode. HARQ retransmission of the MTC is an adaptive, asynchronous scheme.

E. Narrowband Internet of Things (NB-IoT)

NB-IoT represents a narrowband IoT technology that supports low-power wide area networks through existing wireless communication systems (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 manner as the existing system, and thus does not need to allocate an additional band separately for the NB-IoT system. For example, one PRB of the existing system band can be allocated for NB-IoT. Since the NB-IoT terminal recognizes a single PRB as each carrier, the PRB and the carrier may be interpreted to have the same meaning in the description of the NB-IoT.

In the present specification, the description of the NB-IoT mainly describes the case where it is applied to the existing LTE system, but the description of the present specification may be extended to the next-generation system (eg, NR system). In addition, the content related to the NB-IoT herein may be extended to MTC for a similar technical purpose (eg, low-power, low-cost, improved coverage, etc.). In addition, NB-IoT may be replaced with 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 narrowband physical broadcast channel (NPBCH), narrowband physical downlink shared channel (NPDSCH), narrowband physical downlink control channel (NPDCCH), narrowband primary synchronization signal (NPSS), narrowband (NSSS) Physical signals such as Primary Synchronization Signal (NRS) and Narrowband Reference Signal (NRS) are provided.

15 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. 15, NPSS is transmitted in the sixth subframe of every frame and NSSS is transmitted in the last (eg, tenth) subframe of every even frame. The terminal may acquire frequency, symbol, and frame synchronization using the sync signals NPSS and NSSS, and search for 504 physical cell IDs (ie, base station IDs). NPBCH is transmitted in the first subframe of every frame and carries the NB-MIB. The NRS is provided as a reference signal for downlink physical channel demodulation and is generated in the same manner as in LTE. However, NB-PCID (Physical Cell ID) (or NCell ID, NB-IoT base station ID) is used as an initialization value for generating an NRS sequence. NRS is transmitted through one or two antenna ports. NPDCCH and NPDSCH may be transmitted in the remaining subframes except 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 narrowband physical uplink shared channel (NPUSCH) scheduling information, and DCI formats N1 and N2 include NPDSCH scheduling information. NPDCCH can be repeated up to 2048 times to improve coverage. The NPDSCH is used to transmit data (eg, TB) of a transport channel such as a downlink-shared channel (DL-SCH) and a paging channel (PCH). The maximum TBS is 680 bits, and up to 2048 repetitive transmissions can be used 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 transmissions are supported for subcarrier spacings of 3.5 kHz and 15 kHz, and multi-tone transmissions are only supported for 15 kHz subcarrier intervals.

F. Network Access and Communication Process

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

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

Referring to FIG. 16, the base station (eg, BS) may periodically transmit the SSB (S1602). Here, SSB includes PSS / SSS / PBCH. SSB may be transmitted using beam sweeping. The PBCH may include a master information block (MIB), and the MIB may include scheduling information regarding a retaining minimum system information (RMI). Thereafter, the base station can transmit the RMSI and OSI (Other System Information) (S1604). The RMSI may include information (eg, PRACH configuration information) necessary for the terminal to initially access the base station. Meanwhile, the terminal identifies the best SSB after performing SSB detection. Thereafter, the terminal may transmit the RACH preamble (Message 1, Msg1) to the base station using the PRACH resources linked / corresponding to the index (ie, beam) of the best SSB (S1606). The beam direction of the RACH preamble is associated with a PRACH resource. The association between the PRACH resource (and / or RACH preamble) and the 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 random access response (RAR) (Msg2) in response to the RACH preamble (S1608), and the terminal uses the Msg3 (eg, UL grant in the RAR) In step S1610, the base station may transmit a contention resolution message Msg4 (S1620). Msg4 may include an RRC Connection Setup.

If the RRC connection is established between the base station and the 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 the SSB / CSI-RS (S1614). The SSB / CSI-RS may be used by the terminal to generate a beam / CSI report. On the other hand, the base station may request the terminal to the beam / CSI report through the DCI (S1616). In this case, the terminal may generate a beam / CSI report based on the SSB / CSI-RS and transmit the generated beam / CSI report to the base station through the PUSCH / PUCCH (S1618). The beam / CSI report may include a beam measurement result, information on a preferred beam, and the like. The base station and the terminal may switch the beam based on the beam / CSI report (S1620a, S1620b).

Thereafter, the terminal and the base station may perform the above-described procedures and / or methods. 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 the RACH, etc.) Or transmit the received wireless signal to the memory. Here, the radio signal may include at least one of PDCCH, PDSCH, and RS (Reference Signal) in downlink, and at least one of PUCCH, PUSCH, and SRS in uplink.

The above description can be basically applied to MTC and NB-IoT in common. The parts that can vary in MTC and NB-IoT are described further below.

MTC Network Connection Process

The MTC network access procedure will be further described based on LTE. The following description may be extended to NR as well. In FIG. 3 and / or 16 the PDCCH is replaced with an MPDCCH (MTC PDCCH) (see, eg, FIG. 14 and related description).

In LTE, the MIB includes 10 reserved bits. In MTC, 5 Most Significant Bits (MSBs) of 10 reserved bits in the MIB are used to indicate scheduling information for a system information block for bandwidth reduced device (SIB1-BR). Five MSBs are used to indicate the number of repetitions of the SIB1-BR and the transport block size (TBS). SIB1-BR is transmitted in the PDSCH. SIB1-BR may not change in 512 radio frames (5120 ms) to allow multiple subframes to be combined. The information carried in SIB1-BR is similar to SIB1 of LTE system.

The MTC random access procedure (or RACH procedure) is basically the same as the LTE random access procedure (or RACH procedure) (see, for example, FIG. 4 and related description), and differs in the followings: MTC random access procedure (or RACH procedure) Is performed based on the Coverage Enhancement (CE) level. For example, to improve PRACH coverage, whether or not to repeat PRACH transmission may vary for each CE level. 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 the number of repetitive transmissions 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 with full mobility and CSI feedback, and may be set to have 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 may be large.

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

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

Preamble group: preamble set allocated for each CE level

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

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

Conflict Resolution Window Time: The length of time period to expect to receive a conflict resolution message.

The UE may select a PRACH resource corresponding to its CE level and then 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 the PRACH may also be repeatedly transmitted, and the number of repetitions may be independently set according to the CE mode / level.

NB-IoT Network Connection Process

The process of accessing an NB-IoT network is further described based on LTE. The following description may be extended to NR as well. 3 and 16, PSS, SSS and PBCH are replaced with NPSS, NSSS and NPBCH in NB-IoT, respectively. Refer to FIG. 15 for the details of NPSS, NSSS, and NPBCH. 3 and / or 16, PDCCH, PDSCH, PUSCH, PRACH are replaced with NPDCCH, NPDSCH, NPUSCH, NPRACH.

The NB-IoT random access procedure (or RACH process) is basically the same as the LTE random access process (or RACH process) (for example, see FIG. 4 and related description), and differs in the following points. 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. Secondly, the NB-IoT random access procedure (or RACH procedure) 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 procedure (or RACH procedure).

17 illustrates preamble transmission on an NB-IoT RACH.

Referring to FIG. 17, the NPRACH preamble may be configured with four symbol groups, and each symbol group may be configured with a CP and a plurality of SC-FDMA symbols. In NR, the SC-FDMA symbol may be replaced with an OFDM symbol or a DFT-s-OFDM symbol. The NPRACH only supports single-tone transmissions with 3.75kHz subcarrier spacing, and offers 66.7μs and 266.67μs length CPs 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 one subcarrier leap, the third symbol group is six subcarrier leaps, and the fourth symbol group is one subcarrier leap. 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} to improve coverage. NPRACH resources may 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 may be transmitted on an anchor carrier or on a non-anchor carrier with NPRACH resources configured.

G. Discontinuous Reception (DRX) Operation

The UE may perform the DRX operation while performing the procedures and / or methods described / proposed herein. The UE in which DRX is configured may lower power consumption by discontinuously receiving a DL signal. DRX may be performed in a Radio Resource Control (RRC) _IDLE state, an RRC_INACTIVE state, and an RRC_CONNECTED state.

RRC_CONNECTED DRX

In the RRC_CONNECTED state, DRX is used for discontinuous reception of PDCCH. For convenience, DRX performed in the RRC_CONNECTED state is referred to as RRC_CONNECTED DRX.

18 illustrates a DRX cycle for discontinuous reception of a PDCCH.

Referring to FIG. 18, a DRX cycle includes On Duration and Opportunity for DRX. The DRX cycle defines the time interval in which On Duration repeats periodically. On Duration indicates a time interval that the UE monitors to receive the PDCCH (or, MPDCCH, NPDCCH). If DRX is configured, the UE performs PDCCH monitoring for On Duration. If there is a PDCCH successfully detected during PDCCH monitoring, the UE operates an inactivity timer and maintains an awake state. On the other hand, if there is no PDCCH successfully detected during PDCCH monitoring, the UE enters a sleep state after the On Duration ends. Therefore, when DRX is configured, PDCCH monitoring / reception may be performed discontinuously in the time domain in performing the above-described / proposed procedures and / or methods. For example, when DRX is configured, PDCCH monitoring may be performed discontinuously according to DRX configuration in activated cell (s) in the present invention. Specifically, PDCCH monitoring is performed when a PDCCH opportunity (e.g., a time interval (e.g., one or more consecutive OFDM symbols) set to monitor the PDCCH) corresponds to On Duration, and PDCCH monitoring is performed when corresponding to Opportunity for DRX. Monitoring can be omitted. On the other hand, when DRX is not configured, PDCCH monitoring / reception may be continuously performed in the time domain in performing the above-described / proposed procedure and / or method. For example, when DRX is not set, in the present invention, the PDCCH reception opportunity may be set continuously. On the other hand, regardless of whether DRX is set, PDCCH monitoring may be limited in the time interval set as the measurement gap.

RRC_IDLE DRX

In the RRC_IDLE and RRC_INACTIVE states, the DRX is used to discontinuously receive the paging signal. For convenience, DRX performed in the RRC_IDLE (or RRC_INACTIVE) state is referred to as RRC_IDLE DRX. Therefore, when DRX is set, PDCCH monitoring / reception may be performed discontinuously in the time domain in performing the procedures and / or methods described / proposed herein.

19 illustrates a DRX cycle for paging.

Referring to FIG. 19, DRX may be configured for discontinuous reception of a paging signal. The terminal may receive DRX configuration information from the base station through higher layer (eg, RRC) signaling. The DRX configuration information may include configuration information about a DRX cycle, a DRX offset, a DRX timer, and the like. The UE repeats the On Duration and the Sleep duration according to the DRX cycle. The UE may operate in a wakeup mode at On duration and may operate in a sleep mode at Sleep duration. In the wakeup mode, the UE may monitor the PO to receive a paging message. The PO means a time resource / interval (eg, subframe, slot) in which the terminal expects to receive a paging message. PO monitoring includes monitoring the PDCCH (or MPDCCH, NPDCCH) scrambled with P-RNTI in the PO (referred to as paging PDCCH). The paging message may be included in the paging PDCCH or may be included in the PDSCH scheduled by the paging PDCCH. One or a plurality of PO (s) is included in a paging frame (PF), and the PF may be periodically set based on the UE ID. Here, the PF corresponds to one radio frame, and the UE ID may be determined based on the International Mobile Subscriber Identity (IMSI) of the terminal. If DRX is configured, the UE monitors only one PO per DRX cycle. When the terminal receives a paging message indicating a change of its ID and / or system information from the PO, the terminal performs a RACH process to initialize (or reset) the connection with the base station, or receives new system information from the base station ( Or acquisition). Accordingly, in performing the above described / proposed procedures and / or methods, PO monitoring may be performed discontinuously in the time domain to perform RACH for connection with a base station or to receive (or obtain) new system information from the base station. Can be.

20 illustrates an extended DRX (eDRX) cycle.

According to the DRX cycle configuration, the maximum cycle duration may be limited to 2.56 seconds. However, in the case of a terminal in which data transmission and reception are intermittently performed, such as an MTC terminal or an NB-IoT terminal, unnecessary power consumption may occur during a DRX cycle. In order to further reduce the power consumption of the UE, a method of greatly extending the DRX cycle based on a power saving mode (PSM) and a paging time window or a paging transmission window (PTW) has been introduced, and the extended DRX cycle is referred to simply as an eDRX cycle. . Specifically, PH (Paging Hyper-frames) is periodically configured based on the UE ID, PTW is defined in the PH. The UE may monitor a paging signal by performing a DRX cycle in a PTW duration to switch to a wake-up mode in its PO. One or more DRX cycles (eg, wake-up mode and sleep mode) of FIG. 19 may be included in the PTW section. The number of DRX cycles in the PTW interval may be configured by the base station through a higher layer (eg, RRC) signal.

H. Methods and Devices Proposed by the Invention

The contents described above (3GPP system, frame structure, MTC / NB-IoT system, etc.) may be applied in combination with the methods proposed in the present invention, or the description of the methods proposed in the present invention It can be supplemented to clarify the feature.

In the present patent specification, the BL UE is referred to as an MTC terminal, and more than the MTC terminal function is additionally implemented so that the terminal operating in the CE mode (CE mode, coverage enhanced mode or coverage enhancement mode or coverage extended mode or coverage extension mode) is non-compliant. Named as BL UE. Non-BL UE has the following characteristics compared to MTC terminal.

(1) Broadband reception: MTC terminal can receive downlink up to 5MHz according to the capability, but non-BL UE can receive up to 20MHz bandwidth in a single component carrier.

(2) Multiple Receive Antennas: Although the MTC terminal assumes a single receive antenna, the non-BL UE has at least two receive antennas in its implementation, and whether to use a single or multiple antennas in the CE mode operation is currently an implementation issue. .

(3) High Complexity CSI Calculation: Since MTC terminal calculates CSI (Channel State Information) based on CRS (Cell Reference Signal or Common Reference Signal) and supports only one rank, it is 4x1 vector. Consider only up to (vector) PMI (Precoding Matrix Indicator). However, a non-BL UE can support CSI calculation assuming four or more transmit antennas, and can perform CSI-RS based CSI calculation and received signal strength / quality measurement. In addition, the difference of MPDCCH / PDSCH resource mapping according to CSI-RS configuration is already implemented.

In addition to the above-listed features, the non-BL UE does not operate in the CE mode, that is, when operating in the LTE mode (LTE mode) according to the category (category) or capability (capability) of the terminal does not require a variety of existing MTC It has a function. Whether to use such a function additionally in the CE mode operation is a terminal implementation issue, but in order to use it more effectively, it is necessary to define a special configuration and procedure for a non-BL UE in a standard technology and support it.

In the proposal of the present invention, the case of the non-BL UE operating in the CE mode will be described. For example, since the CE mode is generally used to enable wider coverage at low power, the present invention is directed to a UE (non-BL UE and BL UE) in a power saving mode or a low power mode. The same / similarity may also be applied when operating in a mode). Therefore, in the proposal of the present invention, "CE mode" may be replaced with "power saving mode" or "low power mode".

H.1 Paging channel reception method according to terminal type

When the non-BL UE operates in CE mode, the non-BL UE may be a paging channel or information (especially an emergency channel such as earthquake and tsunami warning system (ETWS) or commercial mobile alert system (CMAS)). Information) may be configured to be received through an LTE paging channel rather than a paging channel for the MTC UE. That is, since it is assumed that the MTC terminal is mainly designed for power saving and low cost, the paging channel monitoring is limited to be performed only in the RRC idle mode, or The cycle can be quite long. On the other hand, non-BL UEs generally have better processing power than MTC terminals and are already implemented to read (receive and detect) LTE channels. Acquisition via an LTE channel other than the MTC channel may be allowed. For this purpose, resources (eg, time / frequency resource allocation and RNTI of (M) PDCCH and PDSCH that a non-BL UE may attempt to detect paging by the base station operating in CE mode) may be used. And related parameters) can be set. The non-BL UE having such a configuration may receive the LTE channel by ignoring the corresponding MTC channel, or attempt to detect a related message in both the MTC channel and the LTE channel.

(1) allow and set the proposal to allow non-BL UEs operating in CE mode to receive a particular channel (e.g., paging channel) over the same purpose channel as defined in the LTE or NR system rather than MTC. The method may require the following procedure.

In the proposal of the present invention, a system or RAT or operation mode in which the terminal operates in an RRC connected mode (or RRC_CONNECTED state) may be referred to as a first system or RAT or operation mode, and the terminal is in an RRC idle mode. A system or a RAT or an operation mode operating in an RRC idle mode (or an RRC_IDLE state) may be referred to as a second system or an RAT or an operation mode. For example, the first system or RAT or operation mode may refer to a system or RAT or operation mode used to perform data transmission / reception after completing a random access procedure to obtain an RRC connection, and a second system or The RAT or operating mode may refer to a system or RAT or operating mode used to attempt to receive a specific channel (eg, paging channel) after the RRC connection is released. And / or, the first system or RAT or mode of operation is a system or RAT or mode of operation that is not configured to support power reduction and coverage extension or enhancement (CE) (or repeated transmission and reception of signals for this purpose). And the second system or RAT or mode of operation may refer to a system or RAT or mode of operation configured to support power savings and coverage expansion or enhancement (CE) (or repeated transmission and reception of signals for this purpose). And / or, the first system or RAT or mode of operation may refer to a system or RAT or mode of operation set to operate in wideband and the second system or RAT or mode of operation may be set to operate in narrowband. It may refer to a system or a RAT or an operation mode.

For convenience of description, the first system or the RAT or the operation mode may be collectively referred to as the first system or the first RAT, and the second system or the RAT or the operation mode may be collectively referred to as the second system or the second RAT.

For example, the first system may be an LTE system or an NR system, and the second system may be an MTC system or an NB-IoT system or an NR-light (NR-light or NR-lite) system.

(1-1) A base station is any third channel that a terminal may appear as inter-RAT (Radio Access Technology) from another system (e.g., LTE or NR or MTC or NB-IoT system). Parameters related to time / frequency resource allocation of the (M) PDCCH and PDSCH and RNTI, paging frame (PF) / The UE may transmit UE_ID (which may assume the same value) and DRX cycle information, P-RNTI, etc.) to be used for calculating a PO (paging occasion). UE_ID refers to UE identification information based on an international mobile subscriber identity (IMSI), and details of determining a DRX cycle, UE_ID, and PF / PO include the entire contents described in 3GPP Technical Specification (TS) 36.304 as a reference. At this time, the terminal is based on the information obtained from the base station (resource unit) (resource unit) defined in the corresponding system (LTE, for example, time / frequency resources defined within the LTE system bandwidth) reference signal associated with the channel ( A channel may be received / detected based on a reference signal) (LTE as an example and CRS or NR as a DMRS).

For example, a base station and a terminal may simultaneously support a first system (eg, an LTE system or an NR system) and a second system (eg, an MTC system, an NB-IoT system, or an NR-lite system), and the base station may support the first system. Configuration information for a specific channel (eg, paging channel) of the second system used for the same purpose as a specific channel (eg, paging channel) may be transmitted to the terminal. More specifically, the base station may transmit configuration information for a specific channel of the second system from the first system to the terminal. The terminal may receive configuration information for a specific channel (eg, paging channel) of the second system from the base station, and more specifically, the terminal may receive configuration information for a specific channel (eg, paging channel) of the second system. Receive from the base station in the system.

As an additional example, when the RRC connection with the terminal is released from the first system, the base station may transmit a specific channel (eg, paging channel) from the second system to the terminal based on the configuration information. When the RRC connection with the base station is released in the first system, the terminal may receive a specific channel (eg, paging channel) from the base station in the second system based on the configuration information.

(1-2) When such information (e.g., configuration information for a specific channel of the first system and / or configuration information for a specific channel of the second system) is given from the base station, the terminal selectively selects the same channel reception. It may attempt to receive or detect a specific channel of another system (eg, the second system) only in the interval allowed by the base station. For example, paging channel configuration (or configuration information) of a second system (e.g., MTC system and / or NB-IoT system and / or NR-lite system) and a first system (e.g., LTE system or If the paging channel setup (or setup information) of the NR system is all given to the terminal, then the terminal receives more than the paging channel reception of the second system (e.g., the MTC system and / or the NB-IoT system and / or the NR-lite system). Paging channel reception of the first system (eg, LTE system or NR system) may be prioritized, and the base station may expect that the terminal does not perform MTC scheduling during the corresponding period. If the paging channel configuration (or configuration information) of the second system (e.g., MTC system and / or NB-IoT system and / or NR-lite system) and the paging channel of the first system (e.g. LTE system or NR system) Given all of the configuration (or configuration information), the terminal may or may not be instructed to attempt to receive a paging channel of the first system (eg, LTE system or NR system) even in RRC connected mode. Likewise, it may be allowed not to expect scheduling in the second system (eg, MTC system and / or NB-IoT system and / or NR-light system) in the corresponding interval.

(1-3) In accordance with the above proposal, the terminal registers a registered Radio Access Technology (RAT) (or system) (that is, a RAT that performs a random access procedure, acquires system related information, and performs data transmission / reception). If the RAT (or system) that attempts to receive the paging channel differs from the terminal, the terminal needs to determine in which RAT the operation should be performed after the paging channel is received. For example, the terminal operates in a first system (e.g., LTE system or NR system) in RRC connected mode (after RRC disconnection) and a second system (e.g., MTC system or NB-IoT system or NR in RRC idle mode). When operating in a light system, the terminal receives a specific channel (eg, paging channel) from the second system and then performs a subsequent operation (eg, random access procedure) in the first system or the second system. You can decide.

This may be a method in which the terminal directly instructs the RAT (or system) to operate after receiving the corresponding channel in the paging channel, and if the subsequent operation cannot be performed in the corresponding RAT (for example, the SNR (Signal- If the to-noise ratio is not high enough or the power is not sufficient in the indicated RAT, the terminal may directly select the RAT and try again from the random access procedure. If the information of the RAT obtained from the base station before the paging channel reception is not sufficient for the communication except the paging reception, the paging channel may include all the information necessary for the subsequent operation or obtain necessary information. It can inform the channel information of the corresponding RAT. In this case, the ID (eg, C-RNTI) of the terminal may be assigned a value different from the ID of the existing RAT in a paging channel or an associated subsequent channel, and if necessary, may perform contention free-based random access (CFRA). Relevant parameters can be provided.

(1-4) According to the proposal of the present invention, a terminal operates in a first system (eg, an LTE system or an NR system) in an RRC connected mode and a second system (eg, an MTC system or an NB-IoT system in an RRC idle mode). Or NR-lite system) to attempt to receive / detect a particular channel (eg, paging channel). Alternatively, the terminal may operate in a second system (eg, an MTC system or an NB-IoT system or an NR-lite system) in an RRC connected mode, and may use a specific channel (eg, an LTE system or an NR system) in an RRC idle mode. For example, a paging channel) may be configured to attempt to receive / detect.

In the proposal, a terminal registered in a second system (for example, a narrow-band system) (for example, an MTC system, an NB-IoT system, or an NR-right system) and communicating with an RRC idle mode (RRC Idle) mode in the RRC idle mode when paging reception is directed to monitor in a first system (e.g., a wide-band system) (e.g., an LTE system or an NR system). Relevant operations (e.g., measures such as measurements required for cell selection / reselection) are also set to be performed in the corresponding RAT (first system (e.g., broadband system) in the above example) You can accept it. Alternatively, the RRC idle mode may be configured / allowed to perform mobility related operations (eg, a measurement required for cell selection / reselection, etc.) in the corresponding RAT (first system (eg, broadband system) in the above example). When receiving, the terminal may be instructed to monitor paging reception in a first system (e.g., broadband system) (e.g., LTE system or NR system) in RRC idle mode and obtain relevant parameters from the base station.

Alternatively, in the proposal, a terminal registered and communicating in a first system (for example, a wideband system) (for example, an LTE system or an NR system) may receive paging in an RRC idle mode. Mobility in RRC idle mode when directed to monitor in a two-system (e.g., narrow-band system) (e.g., MTC system or NB-IoT system or NR-light system). ) Related operations (e.g., operations such as measurements required for cell selection / reselection) are also performed in the corresponding RAT (second system (e.g., narrowband system in the above example)). Can be set / allowed. Alternatively, the mobility-related operation (eg, an operation such as measurement required for cell selection / reselection) in the RRC idle mode may also be configured to be performed by the corresponding RAT (second system (eg, narrowband system) in the above example). If allowed, the terminal is instructed to monitor paging reception in a second system (e.g., narrowband system) (e.g., MTC system or NB-IoT system or NR-light system) in RRC idle mode, and associated parameters. Can be obtained from the base station.

(1-5) In the above proposal, the RRC is registered in the second system (e.g., a narrow-band system) (e.g., an MTC system, an NB-IoT system, or an NR-right system) to communicate. In RRC Idle mode, paging reception is monitored by a first system (e.g., wide-band system) (e.g., LTE system or NR system) (or a different RAT than the registered RAT). ), Or a terminal registered in a first system (e.g., a wide-band system) and communicating with a terminal in an RRC idle mode (RRC Idle mode), receives a second system (e.g., a narrowband (e.g., When paging monitoring is detected in a narrow-band system (or a different RAT than the registered RAT), the base station directly instructs the system (either narrowband or broadband system) or the RAT in which subsequent operation of the terminal is to be performed, or Or to enter RRC idle mode In the procedure, the system or RAT to operate (send / receive) after paging detection can be set in advance. In addition, there may be a case in which the terminal desires subsequent operation in a system or a RAT different from the RAT that receives the paging. In this case, the terminal may be directly instructed in paging or perform random access in a predetermined system or RAT. This can be announced. That is, in the random access Msg.1 or Msg.3 or later uplink signal / channel transmission process, the terminal may request a base station or a system that you want to operate subsequently, if the base station requests the corresponding RAT The terminal can accept the request of the terminal while providing the necessary information.

(1-6) In the above proposal, a terminal registered and operated in a second system (e.g., a narrow-band system) is measured for a specific purpose (e.g., for paging channel monitoring or mobility management). In case of performing the operation of the first system (e.g., wideband system) for the purpose of the measurement, the terminal needs the complexity (e.g., Transmit and / or receive bandwidth, transmit and / or receive antennas) or more. For example, when opportunistically operating in a first system (eg, broadband system), the number of receive antennas may still be allowed to use only the number of antennas required or used by the second system (eg, narrowband system). have. Alternatively, such an operation may be performed only in the case of a terminal capable of supporting the complexity required by the first system (eg, a broadband system) (for example, the transmission and / or reception bandwidth of the terminal, the number of transmission and / or reception antennas). May be allowed.

As described above, different RATs or systems may mean LTE, NR, (e) MTC, NB-IoT, NR-Lite, and the like. Alternatively, different repetition levels (or number of repetitions) to support different coverages for paging channel transmission are supported, and accordingly, repetition levels to be applied to subsequent channel transmission / reception after paging reception ( Alternatively, when the number of repetitions) or the operations are different, the operation / suggestion may be applied to the same RAT or the system by considering the operations for different repetition levels (or the number of repetitions) as operations in different RATs or systems.

21 illustrates a method for transmitting and receiving a signal between a terminal and a base station according to a method proposed in the present invention (for example, refer to proposals (1-1) to (1-6) in Section H.1). Although the example of FIG. 21 is described based on the method proposed in Section H.1, one or more of the methods proposed in Sections H.2 to H.11 may be combined and applied to the example of FIG. 21 without limitation. The first system and the second system may be defined as described in section H.1 above. In the method illustrated in FIG. 21, it is assumed that the terminal and the base station operate in the first system in the RRC connected mode and in the second system in the RRC idle mode, but this is only for clarity of explanation and the proposal of the present invention is It is not limited. The method of FIG. 21 and the proposal of the present invention may be applied to the same / similarly when the terminal and the base station operate in the second system in the RRC connected mode and operate in the first system in the RRC idle mode. The terminal and the base station can support both the first system and the second system (or can be configured to operate in both the first system and the second system). In the example of FIG. 21, the terminal may correspond to a non-BL UE, and may be a terminal operating in a CE mode by implementing more functions than the MTC terminal (eg, the H method “the method and apparatus proposed by the present invention). " Reference). As described above, a terminal may be referred to by other terms such as a user equipment (UE), a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, and the like. The base station (BS) is a wireless device that communicates with a terminal and may be referred to by other terms such as an evolved Node-B (eNB), a General Node-B (gNB), a base transceiver system (BTS), an access point (AP), and the like. (Eg, see Section A herein).

In step S2102, the terminal receives the configuration information for the specific channel of the second system from the base station, the base station may transmit the configuration information for the specific channel of the second system to the terminal. For example, in step S2102, the terminal and the base station may operate in the first system (in RRC connected mode), and in this case, configuration information for a specific channel of the second system may be received in the first system. For example, although a specific channel may be a channel related to paging, the proposal of the present invention is not limited thereto and may be applied to the same / similarly when the channel is other than the paging channel. As a more specific example, the specific channel may be a physical control channel (eg, PDCCH, MPDCCH, NPDCCH) related to paging, or may be a paging channel carrying a paging message.

In operation S2104, the terminal may attempt to receive / detect a specific channel in the second system in the RRC idle mode based on the configuration information received in operation S2102. The base station may transmit a specific channel in the second system to the terminal of the RRC idle mode based on the configuration information transmitted in step S2102.

In operation S2106, the terminal may perform a random access procedure in the first system or the second system in response to receiving the specific channel in operation S2104. As an example, the terminal may perform a random access procedure and / or subsequent data transmission / reception (referring to data transmission and reception performed after acquiring an RRC connection through a random access procedure) in a preset system (by the base station). As a more specific example, a system for performing random access procedure and / or subsequent data transmission / reception may be set by the base station at the time of RRC connection release.

As another example, the terminal may determine a system to operate after detection of a specific channel among the first system and the second system based on the information received through the specific channel (S2104), and perform a random access procedure in the determined system. As a more specific example, the terminal may perform an RRC connection with the base station by performing a random access procedure in the second system in response to the reception of a specific channel and then transmit and receive data with the base station in the first system. As another example, the terminal may perform an RRC connection with the base station by performing a direct random access procedure in the first system in response to the reception of a specific channel, and then perform data transmission and reception with the base station in the first system.

As an example, the terminal may receive information in the first system indicating a system to operate after detection of a specific channel (not shown), and may perform random access procedure and / or subsequent data transmission and reception in the system indicated by the received information. Can be done. As another example, the terminal determines a system to operate after detecting / receiving a specific channel, transmits a request for the determined system to the base station, and receives an acceptance of the request from the base station, thereby allowing a random access procedure and And / or subsequent data transmission and reception. In this case, the base station may transmit information necessary for operating in the system determined by the terminal to the terminal. As described above, the request for the system determined by the terminal is transmitted through a random access preamble (or Msg. 1) or an uplink transmission (or Msg. 3) (or RRC) for a random access response (or Msg. 2). Uplink transmission including a connection request message) or a subsequent uplink signal / channel transmission process.

In addition, the proposals of (1-1) to (1-6) in Section H.1 may be applied without limitation to the method of FIG. In addition, the method illustrated in FIG. 21 is not limited to the above description and may be implemented in combination with the methods described in Sections H.1 to H.11.

In addition or independently of the above proposal (1), if the UE-specific search space (USS) in the RRC connected mode to the non-BL UE operating in the CE mode (CE mode) Receive additional channels, such as Common search space (CSS), and other information such as earthquake and tsunami warning system (ETWS) / commercial mobile alert system (CMAS) (for example, receive paging channels) In the case of requesting to obtain the A, prioritization rule between a search space to be received and monitored by the terminal may be required. The prioritization rule may include the following methods.

(2) a second search space (e.g., a search space that the terminal should receive / attempt in order to receive unicast data in a connected mode (e.g., A first search space (e.g., a search space (e.g., USS) that the device must attempt to receive / detect by default for receiving unicast data in connected mode) while attempting to receive certain CSS, not USS) An additional gap may be set that may not receive.

An operation in which a terminal attempts to receive / detect a search space (or a specific (control) channel in the search space) may be referred to as monitoring. The terminal may receive gap setting information related to the search space (or monitoring of the search space) from the base station. The gap setting information may indicate a gap (or gap duration) according to the present invention, and the gap (or gap period) of the present invention may be set based on the gap setting information received from the base station. The gap setting information according to the present invention may be received through system information (or system information block (SIB)) or may be received through higher layer signaling (eg, RRC layer signaling). The gap (or gap section) of the present invention may be set in units of subframes, and the gap setting information may indicate the number of subframes corresponding to the set gap (or gap section). Alternatively, when the present invention is applied to the NR system, the gap of the present invention may be set in units of slots, and the gap information may indicate the number of slots corresponding to the set gap (or gap period).

(2-1) The gap section may not be applied when the first search space and the second search space may exist in one narrowband NB at a specific time point. In other words, the terminal receives both the first and second search spaces.

On the other hand, the gap interval may be applied when the first search space and the second search space exist in different narrow bands (NB) at a specific time point. In this case, the terminal may attempt to receive / detect the second search space at a specific time point, and the terminal may not receive / detect the first search space not only at the specific time point but also within the set gap period (or the first search). Postpone reception / detection of space).

(2-2) The gap section may be defined as a section allowed to preferentially receive / detect the first search space and not attempt to detect the second search space. In this case, the gap section may be applied to the reception / detection of the second search space, and the terminal may first try to receive / detect the first search space within the gap section, and may detect the second search space within the gap section. May not be received / detected (or may defer receiving / detecting the second search space).

(2-3) When PDSCH is scheduled in a subframe / slot that overlaps with a set second search space section in time, the terminal receives a second search space / May not be allowed to attempt detection. In this case, the terminal defers or receives / detects the second search space without attempting to receive / detect the second search space in a time interval (eg, a subframe or slot) where the second search space interval and the PDSCH scheduled interval (or PDSCH transmission interval) overlap. Can be skipped. On the other hand, the terminal may receive a scheduled PDSCH in a time interval overlapping the second search space interval.

(2-4) In the case of the HD-FDD (Half Duplex Frequency Division Duplex (FDD)) UE, the same applies to the case where the PDSCH scheduled from the downlink control information (DCI) or the associated PDSCH from the DCI is PUSCH or PRACH or PUCCH. . For example, when the terminal operates in HD-FDD (or is configured to operate in HD-FDD), when the PUSCH is scheduled (or overlapping subframes) in a subframe / slot that overlaps with the set second search space interval in time. In case of transmitting a PUSCH in / slot, the UE may be allowed not to attempt to receive / detect a second search space in an overlapping time period (or subframe / slot). Accordingly, the terminal defers or receives / detects the second search space without attempting to receive / detect the second search space in a time interval (eg, a subframe or a slot) where the second search space interval and the PUSCH scheduled interval (or PUSCH transmission interval) overlap. Can be omitted. On the other hand, the terminal may transmit a scheduled PUSCH in a time interval overlapping the second search space interval.

As another example, when the terminal operates in HD-FDD (or is configured to operate in HD-FDD), when the terminal is configured to transmit a PRACH in a subframe / slot overlapping in time with the set second search space interval, the terminal overlaps with each other. It may be allowed not to attempt to receive / detect the second search space in the interval (or subframe / slot). Accordingly, the terminal may postpone or omit the reception / detection without attempting to receive / detect the second search space in the time interval (eg, subframe or slot) where the second search space interval and the PRACH transmission interval overlap. On the other hand, the terminal may transmit a PRACH in a time interval overlapping the second search space interval.

As another example, when the terminal operates in HD-FDD (or is configured to operate in HD-FDD), when the terminal is configured to transmit a PUCCH in a subframe / slot that overlaps in time with the set second search space interval, the terminal overlaps. It may be allowed not to attempt to receive / detect a second search space in a time interval (or subframe / slot). Accordingly, the terminal may postpone or omit the reception / detection without attempting to receive / detect the second search space in a time interval (eg, a subframe or a slot) where the second search space interval and the PUCCH transmission interval overlap. On the other hand, the terminal may transmit the PUCCH in a time interval overlapping the second search space interval.

In the above description, the priority of the search space has been described. However, the proposals of the present invention can be applied to the same / similarity of the priority of the control channel (eg, PDCCH, MPDCCH, or NPDCCH). For example, the gap of the present invention is not a second control channel (e.g., a control channel associated with receiving unicast data in connected mode (e.g., a PDCCH scrambled with C-RNTI) but a specific control channel (e.g. P- Receive / detect a first control channel (e.g., a control channel (e.g., a PDCCH scrambled with C-RNTI) associated with receiving unicast data in connected mode) while attempting to receive / detect RNTI (scrambled PDCCH) Can be set to not try.

In this case, when the first control channel and the second control channel are set in one narrow band (NB) within the set gap period, the gap period of the present invention is not applied, and the terminal is not connected with the first control channel even within the gap period. Attempt to receive / detect all second control channels. On the other hand, when the first control channel and the second control channel in different narrow band (NB) within the set gap interval, the gap interval according to the present invention is applied, the terminal is the first control channel within the set gap interval May defer or omit without attempting to receive / detect and attempt to receive / detect a second control channel.

Alternatively, the set gap period may be applied to reception / detection of the second control channel. In this case, the terminal may preferentially attempt to receive / detect the first control channel within the gap period and may not receive / detect the second control channel within the gap period (or receive / detect the second control channel). Detection can be postponed).

In addition, when a PDSCH is scheduled in a subframe / slot that overlaps a time interval with a set second control channel, the terminal may be allowed not to attempt to receive / detect a second control channel. In this case, the terminal postpones or receives / detects the second control channel without attempting to receive / detect the second control channel interval in the time interval (eg, subframe or slot) where the PDSCH scheduled interval (or PDSCH transmission interval) overlaps. Can be skipped. On the other hand, the terminal may receive a scheduled PDSCH in a time interval overlapping the second control channel interval. In the case of an HD-FDD terminal, the same may be applied to a case where a PDSCH scheduled from or associated with a DCI is a PUSCH or a PRACH or a PUCCH.

22 illustrates a flowchart of a method for a terminal to receive a paging signal according to the present invention. Although the example of FIG. 22 is described based on the method proposed in Section H.1, one or more of the methods proposed in Sections H.2 to H.11 may be combined and applied without limitation to the example of FIG. As described above, a terminal may be referred to by other terms such as a user equipment (UE), a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, and the like. (Eg, see Section A herein).

In the example of FIG. 22, the terminal may correspond to a non-BL UE, and may be a terminal operating in a CE mode by implementing more functions than the MTC terminal (eg, the H method “the method and apparatus proposed by the present invention). " Reference). In the example of FIG. 22, the terminal may be configured to monitor a common search space (CSS) related to reception of a paging signal in an RRC connected mode. The paging signal may include information such as, for example, earthquake and tsunami warning system (ETWS) / commercial mobile alert system (CMAS), and may be received through a paging channel. The paging channel may be received via a shared channel (eg PDSCH) associated with a control channel (eg PDCCH scrambled with P-RNTI) that is received / detected via CSS.

In step S2202, the terminal may receive gap setting information indicating a gap period of a search space. As described above, the gap section refers to a section that is set not to monitor the first search space while monitoring the second search space. The first search space refers to a search space associated with data reception in a connected mode, and more specifically, a search space (eg, USS) to which a terminal should attempt to receive / detect data for unicast data reception. The second search space refers to a specific search space (e.g., CSS) that is not a search space (e.g., USS) that the terminal should attempt to receive / detect (attempt) for receiving unicast data in connected mode. More specifically, it refers to a search space associated with reception of a paging signal. Monitoring refers to the operation of a terminal attempting to receive / detect a search space (or a specific (control) channel in the search space).

In step S2204, the terminal may monitor the search space based on the set gap period. As described in the proposal (2) of section H.1, the terminal may monitor the second search space and not monitor the first search space in a specific time interval based on the set gap interval (or omit or monitor the monitoring). Can be postponed). More specifically, when a first search space and a second search space are set in different narrowbands (NBs) in a specific time interval, the terminal monitors a second search space in the specific time interval and is based on the gap period. In this particular time interval, the first search space may not be monitored (or the monitoring may be omitted or the monitoring may be delayed). On the other hand, when the first search space and the second search space are set in one narrow band in the specific time interval, the terminal does not apply the gap interval, and the terminal searches for both the first search space and the second search space in the specific time interval. Can be monitored.

In step S2204, when the time interval of the second search space and the physical downlink control channel (PDSCH) reception time interval overlap, the terminal may receive the PDSCH without monitoring the second search space in the overlapping time interval. Or, if the terminal operates in half-duplex frequency division duplex (HD-FDD) and the time interval of the second search space and the PUSCH transmission time interval overlap, the terminal transmits the PUSCH without monitoring the second search space in the overlapping time intervals. Can be. Alternatively, when the terminal operates in HD-FDD and the time interval of the second search space and the PRACH transmission time interval overlap, the terminal may transmit the PRACH without monitoring the second search space in the overlapping time intervals. Alternatively, when the terminal operates in HD-FDD and the time interval of the second search space and the PUCCH transmission time interval overlap, the terminal may transmit the PUCCH without monitoring the second search space in the overlapping time interval.

The method illustrated in FIG. 22 is not limited to the above description but may be implemented in combination with the methods described in Sections H.1 to H.11. In addition, the method illustrated in FIG. 22 has been described based on the search space but can be described identically / similarly based on the control channel (see, for example, the description of proposal (2) in section H.1).

23 illustrates a flowchart of a method for transmitting a paging signal by a base station according to the present invention. The example of FIG. 23 is for explaining the operation of the base station corresponding to the example of FIG. 22. The example of FIG. 23 will be described based on the method proposed in Section H.1, but one or more of the methods proposed in Sections H.2 to H.11 23 may be combined and applied without limitation. As described above, a base station (BS) is a wireless device that communicates with a terminal and is referred to by other terms such as an evolved node-B (eNB), a general node-B (gNB), a base transceiver system (BTS), an access point (AP), and the like. (Eg, see section A of this specification).

In the example of FIG. 23, the base station may be configured to communicate with a terminal such as a non-BL UE, and the base station may transmit a control channel to the terminal through a common search space (CSS) associated with a paging signal in an RRC connected mode. Can be set to transmit. The paging signal may include information such as, for example, earthquake and tsunami warning system (ETWS) / commercial mobile alert system (CMAS), and may be transmitted through a paging channel. The paging channel may be transmitted over a shared channel (eg PDSCH) associated with a control channel (eg PDCCH scrambled with P-RNTI) transmitted via CSS.

In step S2302, the base station may transmit gap setting information indicating a gap period of a search space. As described above, the gap period refers to a period in which the terminal is configured not to monitor the first search space while monitoring the second search space (see, for example, proposal (2) in Section H.1). Accordingly, even if the base station does not transmit (or defer or omit transmission) or transmits the first control channel through the first search space while transmitting the second control channel through the second search space based on the gap period, Can be set to not monitor. The definitions of the first search space and the second search space and the monitoring are as described above, so the entire description is incorporated herein by reference.

In step S2304, the base station may transmit a control channel through the search space based on the set gap interval (eg, see proposal (2) in section H.1). As described in step S2204 and H.1, the terminal may monitor the second search space and not monitor the first search space in a specific time interval based on the set gap interval (or omit monitoring or perform monitoring). Can be postponed). Accordingly, in step S2304, the base station transmits the second control channel through the second search space and transmits the first control channel through the first search space (or postpones the transmission) in the specific time period based on the set gap period. Omitted) or even if the first control channel is transmitted may be set so that the terminal does not monitor. More specifically, when the first search space and the second search space are set in different narrowbands (NBs) in a specific time interval, the base station transmits a second control channel through the second search space in the specific time interval. The terminal may be configured not to monitor even if the first control channel is not transmitted (or delayed or omitted) or the first control channel is transmitted through the first search space based on the gap period. . On the other hand, when the first search space and the second search space is set in one narrow band in the specific time interval, the base station does not apply the gap interval, respectively, the base station to the first search space and the second search space in the specific time interval, respectively Both the first control channel and the second control channel can be transmitted.

In step S2304, if the time interval of the second search space and the physical downlink control channel (PDSCH) transmission time interval overlap, the base station does not transmit (or transmits) the second control channel through the second search space in the overlapping time interval. Delay or omit) PDSCH can be transmitted (see, eg, proposal (2) in section H.1). Alternatively, when the base station communicates with a terminal operating in half-duplex frequency division duplex (HD-FDD) and the time interval of the second search space and the PUSCH reception time interval overlap, the base station transmits the second search space through the second search space in the overlapping time interval. The PUSCH may be received without transmitting (or postponing or omitting) the 2 control channel. Alternatively, when the base station communicates with the terminal operating in HD-FDD and the time interval of the second search space and the PRACH reception time interval overlap, the terminal does not transmit the second control channel through the second search space in the overlapping time interval. (Or defer or omit transmission) may receive a PRACH. Alternatively, when the base station communicates with the terminal operating in HD-FDD and the time interval of the second search space and the PUCCH reception time interval overlap, the terminal does not transmit the second control channel through the second search space in the overlapping time interval. (Or defer or omit transmission) may receive the PUCCH.

The method illustrated in FIG. 23 is not limited to the above description but may be implemented in combination with the methods described in sections H.1 to H.11.

H.2 CE level selection according to terminal type

The CE level selection method and the CE mode setting in the MTC are as follows.

(1) CE level selection

The terminal uses CRS-based RSRP (Reference Signal Received Power) as a criterion of the CE level, and the RSRP boundary of each CE level is set by the base station.

In the CRS-based RSRP, a value related to channel quality measurement, such as Reference Signal Received Power (RSRQ) and Signal to Interference & Noise Ratio (SINR), may be used instead of RSRP.

-The terminal selects the CE level by comparing the measured RSRP value and the set RSRP boundary value, and random access using a PRACH resource (for example, time, frequency, preamble ID) configured for the corresponding CE level (Random access) Begin the procedure.

The terminal monitors Msg.2 after Msg.1 transmission, and includes time resources (eg, maximum number of repetitive transmissions and subframe positions that can be used) and frequency resources for monitoring Msg.2. A frequency resource (eg, narrowband location) is preset in association with an Msg.1 resource transmitted by the terminal.

-When the terminal detects Msg. 2, the terminal transmits Msg. 3 as indicated by the uplink grant (UL grant) of the corresponding RAR.

After Msg.3 transmission, the time / frequency resource (MPDCCH indicating Msg.3 retransmission or MPDCCH scheduling Msg.4) to be monitored by the terminal is determined by system information and Msg.2 random access response. Is determined by

A time / frequency resource for monitoring Msg.2 and a downlink time / frequency resource to be monitored after Msg.3 transmission may be defined as MPDCCH and / or PDSCH related parameters in Type-2 CSS. For example, mpdcch-NarrowbandsToMonitor and Rmax (mpdcch-Num Repetition-RA) are set by SIB2.

(2) CE mode setting

-After attaching to the network, the terminal determines the CE mode by the CE level that transmits Msg.1 until the CE mode is set by the base station. In this case, CE levels 0 and 1 correspond to CE mode A, and the remaining CE levels assume CE mode B to perform subsequent operations.

If the same procedure is applied to non-BL UEs, the DL repetition number is unnecessarily large when the CE level is selected based on C-RSRP even when DL coverage increase by 2Rx occurs. Can be. In order to overcome this drawback, the random access procedure may perform a procedure different from that of the general MTC terminal in consideration of the type of the terminal (for example, the number of receiving antennas, the receiving bandwidth, the computing capability, etc.). That is, the non-BL UE may proceed with random access in the following manner.

(1) When selecting the CE level, the RSRP value selected by the terminal is newly defined (hereinafter referred to as RSRP ').

A. RSRP 'used as a reference value of CE level selection in a random access procedure may be different from RSRP used in RRM (Radio Resource Management). That is, RSRP 'which is used as a criterion for CE level selection may consider adding a specific offset to the RSRP measured by the terminal based on the CRS.

B. Here, the specific offset value may be a parameter that may be set to a non-zero value only for the non-BL UE, and the offset may be a value for reflecting the reception signal quality of the terminal.

i. In this case, the condition for setting the offset value to reflect the reception signal quality may be at least the number of reception antennas and / or reception techniques to be used in Msg.2 and / or Msg.4.

ii. When the number of the receiving antennas of the terminal is one or more, it may be a value proportional to the number of antennas or a specific fixed value (for example, 3 dB when the number of terminal receiving antennas is two).

C. The condition under which the terminal can use the proposed RSRP 'when selecting the CE level may be set / defined as follows. That is, RSRP '= RSRP + 0 may be set in the following cases.

i. Only in CE mode A, the offset can be allowed to use non-zero values (greater than zero).

ii. If the offset value is applied to a value other than 0 in RSRP ', it may be allowed only when the CE mode is not changed. That is, CE level 2 or CE level 3 belonging to CE mode B may not be allowed to be changed to CE level 1 or CE level 0 by applying an offset value.

iii. If Msg.1 is transmitted at the CE level selected based on RSRP, if Msg.1 transmit power is equal to or greater than the maximum output power of the terminal, the use of non-zero values in RSRP 'offset may be restricted. Can be.

iv. If Msg.1 is transmitted at the CE level selected based on RSRP, if the difference between Msg.1 transmit power and the maximum output power of the terminal is less than or equal to a specific value, a non-zero value at RSRP 'offset May be restricted.

v. The base station defines a specific reference format so that the MPRPCH and / or PDSCH reception performance (e.g., block error rate (BLER)) does not meet a certain criterion based on the format. Use of nonzero values may be restricted. Here, the reference format is a specific repetition number of the DCDCCH and / or PDSCH, DCI format (DCI format), PMI, which can be used to infer / simulate Msg.2 or Msg.4 reception performance. Information related to a code rate, an aggregation level, and the like may be included.

vi. If Msg.2 is not received within a specific window or Msg.3 has been sent many times but random access procedure is not completed, Msg.3 may be retransmitted several times within a specific window or Msg.1 may not be received. In case of retransmission, use of non-zero value in RSRP 'offset may be restricted.

D. The number of antennas used for Msg.2 reception and Msg.3 retransmission or MPDCCH monitoring for Msg.4 PDSCH scheduling shall be equal to or greater than the number of receive antennas assumed for CE level selection.

E. When the terminal uses a non-zero value as the offset value of the proposed RSRP 'when the CE level is selected, the terminal determines that the information (for example, the offset value or offset value used when selecting the CE level is greater than 0). It is necessary to inform the base station in Msg. 3 or later operation of the reason (e.g., the number of multiple receive antennas assumed / used or used multiple receive antennas).

(2) CE level selection for transmitting Msg.1 is selected based on the use of one receiving antenna, and additionally reporting the number of receiving antennas of the terminal to Msg.3.

A. The terminal informs that it is a non-BL UE in Msg.3, or the number of available reception antennas (the number of antennas to be used for downlink reception after Msg.3, and MPDCCH (MPDCCH) in Type2-CSS. in type2-CSS), at least the number of receive antennas reported in Msg.3 should be used), so that subsequent procedures may be different from MTC terminals based on a single receive antenna. can do.

i. The maximum number of repetitive transmissions (Rmax) and / or the aggregation level (AL) of the type 2-CSS MPDCCH is the reception capability (for example, the number of reception antennas) that the UE reports to Msg. 3 a value previously set for the MTC terminal. It can be interpreted differently according to.

ii. The maximum number of repetitive transmissions (Rmax) and / or the aggregation level (AL) of the type 2-CSS MPDCCH are the same as the values previously set for the MTC terminal, but the PDSCH (for example, corresponding to Msg. 4) in the MPDCCH You can reset the maximum number of repetitive transmissions. That is, in this case, the terminal may be interpreted differently according to the maximum number of repetitive transmissions in which information indicating PDSCH repetitive transmission scheduled in the MPDCCH is reset, and the maximum number of repetitive transmissions and the number of repetitive transmissions of the scheduled PDSCH are reset. May be transmitted on the same MPDCCH.

iii. In case that the random access procedure is successfully performed and contention resolution (CR) is performed, the terminal may set a preset MPDCCH and / or PDSCH parameter value according to a reception capability (eg, the number of reception antennas) reported by Msg.3. Can be interpreted differently.

H.3 How to change the type of terminal

When the non-BL UE or the MTC terminal uses two or more receiving antennas, the operation and setting (parameters set by the base station in consideration of the multiple receiving antennas of the terminal) may be applied differently depending on the RRC state.

For example, an operation of a terminal assuming multiple reception antennas is valid only in an RRC connected state, and there may be an operation and configuration assuming a single reception antenna in an RRC idle state. This may be because the terminal prefers a single receive antenna operation for power saving in the RRC idle state. For this purpose, the terminal does not need to report information related to reception performance required when using a single antenna to the base station. have. Here, the reception performance assuming a single antenna is a CE level (CE level), RSRP (Reference Signal Received Power) / RSRQ (Reference Signal Received Power), CE mode (CE mode), MPDCCH repetition frequency (specific block error rate (BLER) ), And the number of repetitive transmissions of the MPDCCH to satisfy (). A measurement reference resource for deriving the information may also be set by the base station. That is, unlike conventional measurement reference resources for measuring downlink channel quality, a measurement reference resource for downlink channel quality measurement according to the number of receiving antennas may be newly set, which is related to the RRC state. It may not be. If the terminal wants to operate assuming multiple reception antennas in the RRC idle mode, the information reporting can be omitted. In addition, when changing the number of receiving antennas in the RRC idle mode (for example, changing from a multiple receiving antenna to a single receiving antenna or from a single receiving antenna to a multiple receiving antenna), a change request is requested through a random access procedure. It is also possible for the base station to separately configure the Msg.1 resource for this.

In the proposal, the measurement reference resource configuration and the change of the reception antenna according to the number of reception antennas are changed, respectively, and the measurement reference resource setting and the reception scheme change for downlink channel quality or reception performance measurement / prediction according to the reception scheme are changed. In general, we propose each of the following:

(1) The base station may further set measurement reference resources for reception performance measurement / prediction and reporting according to the reception technique of the terminal. The measurement reference resource may be independently set for each reception scheme, or may independently measure and report information (eg, information corresponding to downlink channel quality) according to the reception scheme for each measurement reference resource. The information reported for each reception technique may be reported only for the previously reported information and the differential value.

(2) The information on the reception quality may be a repetition number, CQI, PMI information for the MPDCCH and / or PDSCH.

(3) The base station may request to change the reception scheme of the terminal, and the terminal may reject it. In addition, the terminal may request the base station to change the reception scheme that the terminal intends to use, and the base station may accept or reject it.

A. If the terminal requests, it is necessary to maintain the existing reception scheme until the base station receives an implicit or implicit response from the base station.

B. In the case of requesting or accepting a change of the receiving scheme, the reason for the change of the receiving scheme may be informed together, which may affect the subsequent operation expected by the terminal when the request is accepted. For example,

i. If the yield improvement is the reason for the change of the reception scheme, it can be expected that the rank and / or PMI information is included in the DCI or the range of presentation is increased, and the rank is included in the downlink channel quality report information. And / or PMI information may be included or set to increase the presentation range.

ii. When the coverage increase is the reason for the change of the reception scheme, the expression range of the Rmax value or the repetition number of the MPDCCH and / or the PDSCH may be changed, and thus the interpretation method of the DCI may be changed. In addition, the expression range of the measurement value reported by the terminal may also be defined / set differently.

iii. When the power reduction is the reason for the change in the reception scheme, the expression range of the Rmax value or the number of repetitions of the MPDCCH and / or the PDSCH may be changed, and thus, the method of interpreting the DCI may be changed. In addition, the period of measurement and reporting of the terminal may be changed or the expression range of the measurement report may be defined / set differently.

(4) how to trick the reception technique change,

A. performed through a PRACH resource, or

B. performed through a scheduling request (SR) resource, or

C. Can be performed through a Sound Reference Signal (SRS) resource.

D. That is, the reason for the PRACH transmission, the SR transmission, and the SRS transmission in the above may be due to a change in the reception scheme.

(5) In the case of requesting to change the reception antenna among the reception scheme information of the terminal, the procedure may be different according to the number of antennas used previously.

A. When changing from using a single receive antenna to using multiple receive antennas, if the reason for changing to use multiple receive antennas is to receive more than one MIMO layer or to achieve higher throughput, It is necessary to report the purpose with the request to change the number of receiving antennas. That is, if the base station needs to change information such as DCI configuration in order to schedule one or more MIMO layers, set up a suitable CSI-RS, or request CSI information reporting, it must be reported / requested to the base station. There is.

B. In the above procedure, the operation of assuming the number of receiving antennas of the terminal, which has been previously assumed, is accepted until the base station receives acceptance of the request for changing the number of receiving antennas of the terminal (both requested by the base station or the terminal requests). The terminal needs to follow everything. That is, the terminal and the base station need to operate assuming that all operations related to DCI configuration / interpretation and measurement report, etc. are the same as before until the reception antenna number change request is accepted or for a predetermined time. Here, the method of receiving a request for changing the number of receiving antennas may be explicit or implicit, and in the case of implicit acceptance, the MPDCCH-related Rmax may be newly set or PDSCH-related TM (Transmission Mode), rank ( Rank), CSI feedback mode (CSI feedback mode), Rmax may be newly set.

H.4 Number of receive antennas that can be used for each channel

The terminal may operate by assuming a different number of receiving antennas for each downlink channel, and the base station may schedule the corresponding channel in consideration of this.

(1) type1-CSS (type1-CSS) (MPDCCH search space used for paging and system information update notification and PDSCH scheduled with the corresponding MPDCCH)

A. Whether to use 2Rx antennas may be an implementation issue, when the CE level is selected using multiple receive antennas in RRC connected mode, or when multiple receive antennas are set to be used. In addition, the reception of the type1-CSS related channel can be set assuming a single receive antenna

(2) type2-CSS (type2-CSS) (MPDCCH search space used in the random access procedure and PDSCH scheduled with the corresponding MPDCCH)

A. The number of receive antennas assumed for Msg.4 monitoring may differ from the number of receive antennas used or assumed for Msg.2 monitoring and may differ from the number of receive antennas assumed for CE level selection.

(3) USS and type 0-CSS scrambled with C-RNTI, SPS-C-RNTI, and TPC-PUCCH- RNTI)

A. MPDCCH and PDSCH parameters (for example, csi-NumRepetitionCE, mpdcch-NumRepetition, pdsch-maxNumRepetitionCEmodeA and pdsch-maxNumRepetitionCEmodeB) may be set in consideration of the number of receiving antennas of the terminal, Given a setting value of or may be allowed to interpret differently depending on the actual use or set number of receiving antennas, one setting assuming a reference number of receiving antennas (for example, the number of single receiving antennas). In addition, the DCI format and / or size may be different in the case of assuming a single receive antenna and a multiple receive antenna, and interpretation of the DCI may also be different. In this case, the DCI may be the same as the UL grant (UL grant) irrespective of the number of receiving antennas of the terminal, and the reception of the terminal only for downlink grant (DL grant) and / or information related to the CSI feedback (CSI feedback) Other formats and / or sizes and / or interpretations may be allowed depending on the number of antennas. For example, a field indicating the number of repetitions of a DL grant may be as small as N bits (eg, 1), which N bits may be used to extend RI (Rank Indicator) and / or PMI information. Can be.

(4) Type 0-CSS (search space in which DCI for uplink power control is carried, search space in which MPDCCH is scrambling with TPC-PUCCH-RNTI)

A. The DCI format and / or size and / or interpretation indicating uplink power control may be defined so as not to be affected by the number of reception antennas of the terminal.

H.5 Measurement and reporting operation according to the number of receiving antennas of the terminal

The UE / base station operation related to the present embodiment will be briefly summarized.

First, the UE receives configuration information related to the measurement from the base station.

The UE performs measurement using a reference signal (RS) for measurement based on the received configuration information.

The UE then reports the information about the measurement to the base station on the specific resource.

Next, the base station transmits configuration information related to the measurement to the UE.

And, the base station receives information on the measurement on a specific resource from the UE.

The number of receive antennas used for RLM (Radio Link monitoring) can be assumed / defined otherwise.

(1) When determining in-sync and out-of-sync, the number of receiving antennas to be assumed may be set differently. Alternatively, the terminal using the multiple receive antennas counts the number of out-of-syncs or checks the in-sync when the out-of-sync occurs a certain number of times (for example, once). It may always be necessary to perform RLM using multiple receive antennas. In addition, when performing RLM using multiple reception antennas, the reference DCI format / size for determining in-sync and out-out-sync is different from when using a single reception antenna. Can be defined / applied.

(2) A measurement reference resource for channel state information (CSI) acquisition may be defined differently according to the number of receiving antennas.

A. For example, when using multiple receive antennas or supporting rank 2 or more, the CSI measurement reference resource / signal may be configured to use CSI-RS rather than CRS. In this case, when the CSI-RS is configured, a specific rule may be defined so that there is no confusion in terms of MPDCCH and PDSCH and resource mapping.

i. For example, resources shared with other users (MPDCCH and / or PDSCH) may not expect CSI-RS transmission, or may perform MPDCCH and / or PDSCH rate matching on the assumption that there is no CSI-RS. have. Alternatively, the UE may expect CSI-RS transmission and assume that the MPDCCH and / or PDSCH in the corresponding RE are punctured by the CSI-RS to perform a reception operation.

ii. Rate matching, puncturing, and dropping used in the present invention may be interpreted in the same sense.

iii. If the channel (MPDCCH and / or associated PDSCH) associated with the UE-specific search space (USS) can be expected that the configured CSI-RS is transmitted, rate matching can be expected for REs other than the CSI-RS RE.

(3) In the case where it is assumed or set that the terminal uses multiple receive antennas, the measurement gap may be set shorter than that of a single receive antenna. In addition, when the terminal receives a short measurement interval assuming multiple reception antennas, the resource mapping scheme of the MPDCCH and / or PDSCH in the measurement interval interval is conventional (MPDCCH / PDSCH is repeated for repeated transmission during the measurement interval interval). Unlike count, which is assumed to be a drop, it can be set to postpone.

(4) A measurement gap represents a period in which the UE can use to perform the measurement, and UL and DL transmissions are not scheduled in that period.

(5) The UE receives an RRC signaling including a measurement interval from the base station and performs measurement on a specific signal based on the measurement interval.

(6) The measurement interval may be set in a frequency band different from the active BWP (UE BWP) in which the UE transmits and receives a signal, in which case the UE may use RF retuning (or frequency band switching). frequency band switching) to take measurements during the measurement interval.

(7) And, if the UE performs RF retuning, the time used to switch or reconfigure RF may be further defined or set.

H.6 Resource mapping of MPDCCH / PDSCH when CSI-RS is configured

In the case of a non-BL UE, a measurement reference resource / signal for CSI acquisition may be set to CSI-RS. At this time, the operation and resource mapping of the associated terminal may be as follows.

(1) CE level selection is performed based on CRS-based RSRP (Reference Signal Received Power), but after measurement report is performed based on CSI-RS, MPDCCH and / or CSI-RS measurement is performed based on CSI-RS measurement. Resource related configuration (eg, Rmax, NB, resource allocation type, etc.) of the PDSCH may vary.

(2) When MPDCCH and / or PDSCH is repeatedly transmitted, if CSI-RS is included in some resources between repeated time / frequency resources, both CSIs are repeatedly transmitted in MPDCCH and / or PDSCH resources. It can be puncturing or rate-matching assuming there is an RS. The criteria for puncturing or rate matching may vary depending on whether the corresponding resource is shared with other terminals. For example, when the resource is shared with other terminals, puncturing or resource mapping assuming that the corresponding CSI-RS is not transmitted may be applied. In addition, when the number of CSI-RS ports is larger than a specific value or the CSI-RS transmission period is shorter than a specific value, MPDCCH and / or PDSCH rate matching considering CSI-RS RE may be applied.

(3) The MPDCCH and / or PDSCH resource mapping may be different from the case in which the CSI-RS is not transmitted in the time / frequency resource in which the CSI-RS is transmitted. To this end, the CSI-RS configuration information needs to be shared with all terminals using time / frequency resources over which the CSI-RS is transmitted. To this end, even if the terminal does not support CSI-RS-based CSI measurement, CSI-RS configuration information may be required, which is set to RRC or CSI-RS to the corresponding resource in DCI scheduling PDSCH. It can be implemented in a way to indicate the presence or absence of RS. That is, even if the base station does not require CSI-RS based CSI measurement, the base station needs to inform the RRC and / or DCI to consider the CSI-RS RE in resource mapping. Given this information, the terminal may interpret the MPDCCH and / or PDSCH to be punctured or rate matched to the CSI-RS RE location in the process of mapping the MPDCCH and / or PDSCH. The number of repetitive transmissions of the PDSCH (the actual number of repetitive transmissions or the set maximum number of repetitive transmissions), the CSI-RS transmission period (for example, the ratio of resources for which the CSI-RS is transmitted within a specific time interval), Depending on whether it is shared with the user, it can be interpreted differently between puncturing and rate matching. For example, if the resource is shared with other users, it is interpreted as puncturing; if it is a resource limited to a specific terminal group or itself, it is rate matching; if it is less than a specific number of repetitive transmissions, it is interpreted as rate matching (or puncturing). Can be.

Similar to the above proposal, the resource mapping relationship between the CSI-RS, the MPDCCH, and the PDSCH may be set as follows.

Resource mapping between CSI-RS and MPDCCH

(1) Do not expect CSI-RS transmission in all or some subframes of MPDCCH search space. Resource element (RE), which is used as CSI-RS in LTE EPDCCH, is processed as rate matching in EPDCCH resource mapping process, and when determining ECCE aggregation level (n. N _EPDCCH count in _EPDCCH < 104) is calculated without including the CSI-RS RE. On the other hand, in the MPDCCH, the RE used as the CSI-RS is punctured during the MPDCCH resource mapping process, and the CSI-RS RE is included in determining the ECCE aggregation level. This is because the MTC terminal does not receive the CSI-RS configuration, and therefore it is not possible to know exactly whether the CSI-RS exists. However, if the CSI-RS configuration can be understood when the non-BL terminal is operating in the CE mode (that is, if it can receive related configuration information from the base station), the CSI can be distinguished from the CSI. It may be determined whether the RS RE is to be processed by puncturing or MP matching the MPDCCH resource mapping. In addition, in determining the ECCE aggregation level, whether to include the CSI-RS RE may be different. Based on this, a simple example may be as follows.

① Type 0 and / or Type 1 and / or Type 2 CSS does not expect CSI-RS transmission, or calculates the number of REs used for MPDCCH transmission to determine ECCE aggregation level even when expecting CSI-RS transmission. Also counts the CSI-RS transmitted RE

② MPDCCH search space associated with C-RNTI and / or SPS-C-RNTI and / or TPC-PUCCH-RNTI and / or TPC-PUSCH-RNTI (e.g., CRC scrambling with that RNTI) search space) expects CSI-RS transmission

At this time, in determining the number of REs used for MPDCCH transmission to determine the ECCE aggregation level, the CSI-RS transmitted REs are not counted.

In addition, in the above proposal, whether the CSI-RS RE is considered in determining the resource mapping relationship and the merge level between the MPDCCH and the CSI-RS may vary depending on Rmax (maximum number of repetitive transmissions) in the corresponding search space of the MPDCCH. For example, when Rmax is larger than a specific value, the MPDCCH is punctured for the CSI-RS RE, and the CSI-RS may be set to be included in the number of REs considered in determining the merge level.

Resource mapping between CSI-RS and PDSCH

(1) Scheduling from a PDSCH (e.g., an MPDCCH scrambled with C-RNTI or SPS-C-RNTI) that the terminal (s) that understands the CSI-RS configuration expect to receive or If the CSI-RS transmission is reserved within the corresponding resource, it can be expected that the PDSCH is rate matched except for the RE used for the CSI-RS transmission.

(1) When PDSCH is repeatedly transmitted over several subframes, and when PDSCH resources reserved for CSI-RS transmission and PDSCH resources other than repeated subframes are included, the reserved CSI-RS transmission may not be expected. However, some REs of the PDSCH can be expected to be punctured by the CSI-RS. At this time, it can be expected that puncturing by CSI-RS does not occur in PDSCH resources for which CSI-RS transmission is not reserved.

② In particular, whether the PDSCH is rate matched or punctured with respect to the RE used for the CSI-RS transmission may be differently applied according to the PDSCH transmission method.

For example, rate matching may be applied when PDSCH repetitive transmission is less than a specific value or CSI-RS transmission is reserved for all PDSCH resources used for PDSCH repetitive transmission. Here, whether CSI-RS transmission is reserved in the PDSCH repetitive transmission may be limited to a redundancy version (RV) unit. That is, when the RV is changed between repetitive transmissions and when CSI-RS transmission is reserved for only some PDSCH resources between all repetitive transmissions, the same RV is continuously transmitted (based on BL / CE DL subframe) in the subframe. In the case of whether CSI-RS transmission is the same, a method different from other intervals of PDSCH repeated transmission may be applied in the corresponding interval.

In another example, it may be differently applied according to a PDSCH transmission mode (TM). In particular, in case of using a transmit diversity scheme using an RE group (for example, TM2 or Space Frequency Block Coding (SFBC) or Frequency Shift Transmit Diversity (FSTD)), among rate matching and puncturing, It may be fixed by a specific technique instead of being selectively applied according to other conditions. If puncturing is applied, the RE group constituting the transmit diversity scheme may not be completely received. Therefore, there may be a limitation. When applying rate matching, between the RE groups constituting the transmit diversity scheme, This may be because the intervals are too long to cause performance degradation due to channel changes within the RE group.

H.7 Resource configuration according to the type of the terminal

Depending on the type of terminal (e.g., number of non-BL UEs or generic MTC UEs or the number of receive antennas of the terminal), the MPDCCH and / or PDSCH resource configuration (e.g., Rmax) may be different, which is higher layer message (e.g., For example, after a plurality of resource sets are set for each terminal type through an RRC or an upper layer message, a specific setting is set within the corresponding set based on DCI (or MAC (Medium Access Control)). Control element (CE) based).

(1) Rmax can be set independently for each transmission mode (TM). Here, the term 'independence' includes a case where there is no relation and may be applied to a case where the value is different.

A. When changing TM, the terminal changes the setting of MPDCCH and / or PDSCH to the Rmax value set for the TM, or scales based on the Rmax value (actual Rmax value or reference TM) to be used in the TM. may be reset.

B. When a fallback TM is defined as a TM that can be used regardless of the type of the terminal or to be used when a specific event occurs, the Rmax value to be used in the corresponding fallback TM may be independently set. The fallback TM may also be used as a reference TM in setting the Rmax of another TM.

C. Here, Rmax may be different between the MPDCCH and the PDSCH.

(2) Rmax can be set independently for each rank. Here, the term 'independence' includes a case where there is no relation and may be applied to a case where the value is different.

A. The PDSCH Rmax may be changed according to the rank of the PDSCH scheduled in the MPDCCH, and the corresponding Rmax may be scaled based on the previously set PDSCH Rmax (based on Rank 1) or for rank 2 It may be a preset value.

B. The PDSCH Rmax may be changed according to the rank previously reported by the UE, and the corresponding Rmax may be scaled based on a previously set PDSCH Rmax (based on Rank 1) or may be a preset value for rank 2.

(3) The terminal may relate to the MPDCCH and / or PDSCH resources according to previously reported CSI information (eg, RI, PMI, CQI information, etc.) and / or previously scheduled PDSCH information (eg, RI, TM, etc.). Information (eg, Rmax, DCI format / size, DCI field configuration, TM, etc.) can be expected differently.

(4) In addition to changing the actual Rmax value, the newly expected Rmax value in the proposal may also be applied to a method of changing the configuration and state interpretation of the actual repetition number that can be expected in the DCI according to Rmax. have.

H.8 Receive mode request of terminal

When the non-BL UE operates in the CE mode, it requests the base station directly for its reception mode (for example, the number of reception antennas, the reception bandwidth, the receiver method, etc.) or the reception mode from the base station. You can be directed. This is not necessarily the case for non-BL UEs only, and if the terminal supports more than the minimum reception mode required by the system (ie implementation / operation that is generally considered more complex than minimum reception mode implementation / operation). The same can be applied to.

(1) Request and configuration of a reception mode in a process in which the terminal enters an idle mode from an RRC connected mode

In the process of entering the RRC idle mode, the terminal may make a request to the base station to transmit / receive in the RRC idle mode in a mode different from the reception mode operating in the RRC connected mode, and the base station accepts the request. In this case, parameters related to the reception mode of the terminal may be set. This is especially true if you want to operate in a receive mode where the downlink receive performance degradation is expected to occur (eg, when the number of receive antennas and / or receive bandwidth is reduced) rather than the receiver mode that was operating in the RRC connected mode. You need to go through the request and acceptance process. If the request is accepted, the parameters may be indirectly set from the performance difference before / after the reception mode change without directly indicating the transmission / reception related parameters required in the RRC idle mode. For example, when operating with two receive antennas and then with one receive antenna in RRC idle mode, the maximum number of repetitive transmissions of a paging channel can be interpreted as twice as large, assuming a 3dB degradation in reception performance. May be

(2) Request and configuration of a reception mode while the terminal enters a connected mode from an RRC idle mode

When entering the connected mode from the RRC idle mode, the terminal may report the reception mode related information to the base station or request to change the reception mode in the initial random access (initial random access) process. However, until the related request is accepted or until entering the RRC connection mode (for example, receiving or receiving UE specific RRC configuration information or reporting it and reporting an acknowledgment). You can keep it unchanged.

(3) Request and set receive mode in RRC connected mode

The change of the reception mode of the terminal may be indirectly indicated by the transmission mode change or the rank change of the base station. In addition, the method of requesting the terminal to change the reception mode may be a method of changing the rank in the CSI reporting process in addition to directly making a related request as a message. In this case, the method of accepting the change of the reception request may be an indirect method through which the base station changes to a transmission mode corresponding to the rank or through a downlink schedule corresponding to the rank.

H.9 CSI-RS Configuration for Non-BL UEs operating in CE Mode

The non-BL UE operating in the CE mode basically transmits / receives a channel having the same structure as that of the MTC terminal (BL / CE UE). Therefore, backward compatibility with existing MTC terminals is one of important considerations, and for this purpose, the CSI-RS configuration method may be different from that of the existing LTE. For example, the CSI-RS referenced by a non-BL UE may be a signal that is already transmitted in a cell for LTE terminals, and the non-BL UE may only understand the configuration for the CSI-RS being transmitted. In order to be able to receive the additional configuration, only the configuration may be received. Here, the CSI-RS is not only used for CSI measurement, but also CSI-RS is transmitted for LTE terminals, so that the corresponding RE (Resource Element) can be ignored during MPDCCH / PDSCH decoding. It may be a setting value.

Also, two or more terminals may be configured to receive all corresponding information in a cell common, a CE level common, or a CE mode common. This may be for the PDSCH to be rate matched to the RE except the RE used as the CSI-RS in a specific PDSCH, even for a terminal that does not directly perform CSI measurement based on the CSI-RS.

If CSI-RS based CSI measurement is required, the CSI-RS may be set or defined to be transmitted only when PDSCH scheduling is limited to a specific condition. This may be because, in general, CSI-RS based CSI measurement may require a considerably higher signal-to-noise ratio (SNR). Herein, the specific condition means a situation in which the high SNR interval is indirectly represented, for example, CE mode A, CE level 0 or 1, 64QAM scheduling is set, or rank 2 or more is set. Alternatively, the PDSCH may be limited to a case where a modulation order or code rate of the PDSCH previously scheduled has been N or more times above a specific value and the ACK rate is higher than a specific value in a corresponding section.

H.10 Downlink transmission of rank 2 or higher

A non-BL UE operating in a CE mode may receive a PDSCH of rank 2 or higher according to a capability such as the number of antennas of a corresponding UE. In this case, rank adaptation and Transmission Mode (TM) adaptation may be required. Particularly in the case of TM adaptation, even though the terminal has a (semi-) statically configured TM in LTE, the Space Transmission Block Coding (SFBC) or the default transmission mode in TM1 or TM2 (TM2) In order to perform fallback scheduling with FSTD (Frequency Shift Transmit Diversity), it is required for a terminal to always detect a fallback DCI (eg, DCI format 1A). However, since the MTC detects only one DCI format blindly at a specific time according to the set TM, the fallback TM cannot be used dynamically. To compensate for this, the following method is proposed.

DCI information supporting rank 2 may include information indicating a fallback TM and / or rank. This may be a form defined and added to a field such as a fallback flag in the DCI. Alternatively, the CE mode non-BL UE terminal configured to receive the TM corresponding to the rank 2 or to monitor the DCI for the rank 2 may perform the rank 2 DCI and the fallback DCI (rank 1 or TM1 / TM2 at least at a specific time). All of the scheduling DCIs) may be required to attempt blind detection. Here, the fallback may be valid information only up to the PDSCH interval scheduled in the DCI, and the independent MPDCCH may be irrelevant thereto.

When supporting rank 2 or reporting rank 2 based CSI (CQI and / or PMI), an RCSI value used for a CSI reference resource may be further defined. This may be a value derived from RCSI (csi-NumRepetitionCE) defined for the existing BL / CE UE, and the related information may be a value derived from or additionally set. This is because the rank 2 based PDSCH is generally used in a high SNR region, and thus, the number of reference repetitive transmissions of the PDSCH performance included in the CSI reference resource or represented by the CSI may be lower than the existing value.

In addition, since MTC is a system characterized by repetitive transmission, rank 2 based PDSCH may also be applied to repetitive transmission. In this case, the repeated repeated PDSCH may change the codeword-to-layer mapping relationship and / or the layer-to-antenna port mapping relationship on a specific subframe basis. have. This may vary depending on whether or not frequency hopping. In this case, the specific subframe unit is a unit of a redundancy version (RV) or a frequency hopping interval (number of subframes or corresponding subframes consecutively transmitted in the same narrowband in the frequency domain). It may be an integer multiple of. The mapping rule may also be expressed as a permutation, and may be applied for the purpose of obtaining spatial diversity gain between MIMO layers.

In the case of supporting rank 2 or more, a RI (Rank Indicator, Field for indicating Rank) field may exist in a DL grant that schedules a downlink shared channel. The interpretation of a specific field in the corresponding DCI may vary depending on the value of the field. For example, there may be a Transport Block Size (TBS) and a Modulation and Coding Scheme (MCS), which may be relatively high because SNR and data rate may be high when spatial multiplexing is supported. This may be because a low TBS or MCS is unnecessary and may be aimed at minimizing the increase in DCI size by reinterpreting the field. For example, TBS and MCS may be defined with new values, or some of the states or bits may be used for other purposes if they do not use a particular state (for example, a lower range of values). Can be reinterpreted. In addition, a specific field may be utilized for other purposes when the RI value is not 1, for example, a field for indicating on / off of frequency hopping is always interpreted as off, and the field is It can be used for other purposes.

H.11 Parameter reset according to receive mode

When the non-BL UE operates in the CE mode and reports to the base station that some reception functions that can be used in the normal mode may or may be operated in the CE mode, the base station reports the terminal. The maximum number of repetitive transmissions and / or the maximum number of repetitive transmissions of the MPDCCH and / or PDSCH may be separately added or reconfigured. For example, reception techniques such as MRC, MMSE-IRC, eMMSE-IRC, ML, CRS-IC, Network-Assisted Interference Cancellation and Suppression (NAICS), and Inter-Stream Interference Cancellation (ISIC) improve reception performance. Some parameters in the previously defined CE modes A and B (e.g., the maximum number of repetitive transmissions and / or the MPDCCH and / or PDSCH are actual maximum repetitions that can be indicated by DCI for the maximum repetitive transmission). This is because the number of transmissions) may not be appropriate or may be excessively large compared to the reception performance when the reception scheme is supported.

H.12 Wireless communication device to which the present invention can be applied

Although not limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts of the present invention disclosed herein may be applied to various fields requiring wireless communication / connection (eg, 5G) between devices. have.

Hereinafter, with reference to the drawings to illustrate in more detail. The same reference numerals in the following drawings / descriptions may illustrate the same or corresponding hardware blocks, software blocks, or functional blocks unless otherwise indicated.

24 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.

Referring to FIG. 24, a wireless communication system includes a base station 2410 and a plurality of terminals 2420 located in a base station area. The base station may be represented by a transmitting device, the terminal may be represented by a receiving device, and vice versa. The base station and the terminal are a processor (processor, 2411, 2421), memory (memory, 2414, 2424), one or more transmit (Tx) / receive (Rx) radio frequency module (2415, 2425) (or RF transceiver), Tx processors 2412 and 2422, Rx processors 2413 and 2423 and antennas 2416 and 2426. The processor implements the salping functions, processes and / or methods above. More specifically, in downlink DL (communication from the base station to the terminal), upper layer packets from the core network are provided to the processor 2411. The processor implements the functionality of the L2 layer. In downlink DL, a processor provides multiplexing and radio resource allocation between a logical channel and a transport channel to a terminal 2420 and is responsible for signaling to the terminal. The transmit (TX) processor 2412 implements various signal processing functions for the L1 layer (ie, the physical layer). The signal processing function facilitates forward error correction (FEC) in the terminal and includes coding and interleaving. The encoded and modulated symbols are divided into parallel streams, each stream mapped to an OFDM subcarrier, multiplexed with a reference signal (RS) in the time and / or frequency domain, and using an Inverse Fast Fourier Transform (IFFT). To be combined together to create a physical channel carrying a time-domain OFDMA symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Each spatial stream may be provided to a different antenna 2416 through separate Tx / Rx modules (or transceivers 2415). Each Tx / Rx module can modulate an RF carrier with each spatial stream for transmission. At the terminal, each Tx / Rx module (or transceiver 2425) receives a signal through each antenna 2426 of each Tx / Rx module. Each Tx / Rx module recovers information modulated onto an RF carrier and provides it to a receive (RX) processor 2423. The RX processor implements the various signal processing functions of layer 1. The RX processor may perform spatial processing on the information to recover any spatial stream destined for the terminal. If multiple spatial streams are directed to the terminal, it may be combined into a single OFDMA symbol stream by multiple RX processors. The RX processor uses fast Fourier transform (FFT) to convert the OFDMA symbol stream from the time domain to the frequency domain. The frequency domain signal includes a separate OFDMA symbol stream for each subcarrier of the OFDM signal. The symbols and reference signal on each subcarrier are recovered and demodulated by determining the most likely signal placement points sent by the base station. Such soft decisions may be based on channel estimate values. 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 2421.

UL (communication from terminal to base station) is processed at base station 2410 in a manner similar to that described with respect to receiver functionality at terminal 2420. Each Tx / Rx module (or transceiver) 2425 receives a signal through each antenna 2426. Each Tx / Rx module provides an RF carrier and information to the RX processor 2423. Processor 2421 may be associated with memory 2424 that stores program code and data. The memory may be referred to as a computer readable medium.

The proposal of the present invention may be performed by the base station 2410 and the terminal 2420 which are the wireless communication apparatus described with reference to FIG.

25 illustrates a communication system 1 applied to the present invention.

Referring to Fig. 25, a communication system 1 applied to the present invention includes a wireless device, a base station and a network. Here, the wireless device refers to a device that performs communication using a radio access technology (eg, 5G New RAT (Long Term), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may be a robot 100a, a vehicle 100b-1, 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100e. ), IoT (Internet of Thing) device (100f), AI device / server 400 may be included. For example, the vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include an unmanned aerial vehicle (UAV) (eg, a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, Head-Mounted Device (HMD), Head-Up Display (HUD), television, smartphone, It may be implemented in the form of a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like. The portable device may include a smartphone, a smart pad, a wearable device (eg, smart watch, smart glasses), a computer (eg, a notebook, etc.). The home appliance may include a TV, a refrigerator, a washing machine, and the like. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may be implemented as a wireless device, 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-100f may communicate with each other via the base station 200 / network 300, but may also communicate directly (e.g. sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. vehicle to vehicle (V2V) / vehicle to everything (V2X) communication). In addition, the IoT device (eg, sensor) may directly communicate with another IoT device (eg, sensor) or another wireless device 100a to 100f.

Wireless communication / connection 150a, 150b, 150c may be performed between the wireless devices 100a-100f / base station 200 and base station 200 / base station 200. Here, the wireless communication / connection is various wireless connections such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), inter-base station communication 150c (eg relay, integrated access backhaul), and the like. Technology (eg, 5G NR) via wireless communication / connections 150a, 150b, 150c, the wireless device and the base station / wireless device, the base station and the base station may transmit / receive radio signals to each other. For example, the wireless communication / connection 150a, 150b, 150c may transmit / receive signals over various physical channels.To this end, based on various proposals of the present invention, a wireless signal for transmission / reception 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.

26 illustrates a wireless device that can be applied to the present invention.

Referring to FIG. 26, 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} may refer to the {wireless devices 100a to 100f, the base station 200} and / or the {wireless devices 100a to 100f, wireless of FIG. 25. 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 the 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 the 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 radio 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 coupled to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may perform instructions to perform some or all of the processes controlled by the processor 102 or to perform descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can store software code that includes them. Here, processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be mixed with a radio frequency (RF) unit. In the present invention, a wireless device may mean a communication modem / circuit / chip.

The second wireless device 200 may include 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 the 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 the information in the memory 204 to generate third information / signal, and then transmit the wireless signal including the third information / signal through the transceiver 206. In addition, the processor 202 may receive the radio signal including the fourth information / signal through the transceiver 206 and then store 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 store various information related to the operation of the processor 202. For example, the memory 204 may perform instructions to perform some or all of the processes controlled by the processor 202 or to perform descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can store software code that includes them. Here, processor 202 and memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 206 may be coupled with the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be mixed with an RF unit. In the present invention, a 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. One or more protocol layers may be implemented by one or more processors 102, 202, although not limited thereto. For example, one or more processors 102 and 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102, 202 may employ one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Can be generated. One or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. One or more processors 102, 202 may generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information in accordance with the functions, procedures, suggestions and / or methods disclosed herein. And one or more transceivers 106 and 206. One or more processors 102, 202 may receive signals (eg, baseband signals) from one or more transceivers 106, 206, and include descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. In accordance with the above, a PDU, an SDU, a message, control information, data, or information can be obtained.

One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors 102, 202 may 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. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software, and the 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 may be included in one or more processors (102, 202) or stored in one or more memories (104, 204) of It may be driven by the above-described processor (102, 202). The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions, and / or a set of instructions.

One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or instructions. One or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer readable storage medium, and / or combinations thereof. One or more memories 104, 204 may be located inside and / or outside one or more processors 102, 202. In addition, one or more memories 104, 204 may be coupled with one or more processors 102, 202 through various techniques, such as a wired or wireless connection.

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

27 shows another example of a wireless device to which the present invention is applied. The wireless device may be implemented in various forms depending on the use-example / service (see FIG. 25).

Referring to FIG. 27, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 26, and various elements, components, units / units, and / or modules It can be composed of). For example, the wireless device 100, 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit may include communication circuitry 112 and transceiver (s) 114. For example, communication circuitry 112 may include one or more processors 102, 202 and / or one or more memories 104, 204 of FIG. 26. For example, the transceiver (s) 114 may include one or more transceivers 106, 206 and / or one or more antennas 108, 208 of FIG. 26. The controller 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 the information stored in the memory unit 130 to the outside (eg, other communication devices) through the communication unit 110 through a wireless / wired interface, 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 configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an I / O unit, a driver, and a computing unit. Although not limited thereto, the wireless device may be a robot (FIGS. 25, 100 a), a vehicle (FIGS. 25, 100 b-1, 100 b-2), an XR device (FIGS. 25, 100 c), a portable device (FIGS. 25, 100 d), a home appliance. (FIG. 25, 100e), IoT device (FIG. 25, 100f), terminal for digital broadcasting, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environment device, The server may be implemented in the form of an AI server / device (FIGS. 25 and 400), a base station (FIGS. 25 and 200), a network node, or the like. The wireless device may be used in a mobile or fixed location depending on the usage-example / service.

In FIG. 27, various elements, components, units / units, and / or modules in the wireless devices 100 and 200 may be entirely interconnected through a wired interface, or at least a part of them may be wirelessly connected through the communication unit 110. For example, the control unit 120 and the communication unit 110 are connected by wire in the wireless device 100 or 200, 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. In addition, each element, component, unit / unit, and / or module in wireless device 100, 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 controller 120 may be configured as a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, and the like. As another example, the memory unit 130 may include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and / or combinations thereof.

Hereinafter, the implementation example of FIG. 27 will be described in more detail with reference to the accompanying drawings.

28 illustrates a portable device applied to the present invention. The mobile device may include a smart phone, a smart pad, a wearable device (eg, smart watch, smart glasses), 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. 28, the portable 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. ) May be included. 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 of FIG. 27, 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 control various components of the mobile device 100 to perform various operations. The control unit 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. In addition, the memory unit 130 may store input / output data / information and the like. 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 of the mobile device 100 to another external device. The interface unit 140b may include various ports (eg, audio input / output port and video input / output port) for connecting to an external device. 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 obtains information / signals (eg, touch, text, voice, image, and video) input from the user, and the obtained information / signal is stored in the memory unit 130. Can be stored. The communication unit 110 may convert the information / signal stored in the memory into a wireless signal, and directly transmit the converted wireless signal to another wireless device or to the base station. In addition, the communication unit 110 may receive a radio signal from another wireless device or a base station, and then restore the received radio signal to original information / signal. The restored information / signal may be stored in the memory unit 130 and then output in various forms (eg, text, voice, image, video, heptic) through the input / output unit 140c.

29 illustrates a vehicle or an autonomous vehicle applied to the present invention. The vehicle or autonomous vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, or the like.

Referring to FIG. 29, the vehicle or the 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 through 140d respectively correspond to blocks 110/130/140 in FIG.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other devices such as another vehicle, a base station (eg, a base station, a road side unit), a server, and the like. The controller 120 may control various elements of the vehicle or the autonomous vehicle 100 to perform various operations. The control unit 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 driver 140a may include an engine, a motor, a power train, wheels, a brake, a steering device, and the like. 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, an inclination sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / Reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, humidity sensors, ultrasonic sensors, illuminance sensors, pedal position sensors, and the like. The autonomous driving unit 140d is a technology for maintaining a driving lane, a technology for automatically adjusting speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and automatically setting a route when a destination is set. Technology and the like.

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 obtained data. The controller 120 may control the driving unit 140a to move the vehicle or the autonomous vehicle 100 along the autonomous driving path according to the driving plan (eg, speed / direction adjustment). During autonomous driving, the communication unit 110 may acquire the latest traffic information data aperiodically from an external server and may obtain the surrounding traffic information data from the surrounding vehicles. In addition, during autonomous driving, the sensor unit 140c may acquire vehicle state and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly obtained data / information. The communication unit 110 may transmit information regarding a vehicle location, an autonomous driving route, a driving plan, and the like to an external server. The external server may predict traffic information data in advance using AI technology or the like based on 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 the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, it is also possible to configure the embodiments of the present invention by combining some components and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation in the claims, or may be incorporated into new claims by post-application correction.

The present invention can be applied not only to 3GPP LTE / LTE-A system / 5G system (or NR (New RAT) system) but also to wireless communication devices such as terminals, base stations, etc. that operate in various wireless communication systems.

Claims (14)

1. A method for receiving a signal by a user equipment (UE) configured to operate in a first system in a radio resource control (RRC) connected mode,

   Receiving configuration information for a specific channel of a second system from a base station;

   Receiving the specific channel in the second system based on the configuration information in an RRC idle mode; And

   Performing a random access procedure in the first system or the second system in response to the received particular channel.
2. The method according to claim 1,

   Setting information for a particular channel of the second system is received at the first system.
3. The method according to claim 1,

   Performing the random access procedure,

   Determining a system to operate after detection of the specific channel among the first system and the second system based on the information received through the specific channel;

   Performing the random access procedure in the determined system.
4. The method according to claim 1,

   Receiving information in the first system indicating the system to operate after detection of the particular channel;

   Performing the random access procedure,

   Performing the random access procedure in the indicated system.
5. The method according to claim 1,

   Performing the random access procedure,

   Determining a system to operate after detection of the particular channel;

   Sending a request for the determined system to the base station;

   Receiving an acceptance of the request from the base station.
6. The method according to claim 5,

   Receiving from the base station information needed to operate in the determined system.
7. The method according to claim 5,

   Wherein the request is sent on a random access preamble.
8. The method according to claim 5,

   Wherein the request is sent via uplink transmission for a random access response.
9. The method according to claim 1,

   And the particular channel is a paging channel.
10. The method according to claim 1,

    The second system is a system configured to support repetitive transmission for coverage extension or coverage enhancement,

    The first system is a system that is not configured to support repetitive transmission for coverage extension.
11. The method according to claim 1,

    The second system is a system configured to operate in a narrowband,

    And the first system is a system configured to operate over wideband.
12. The method according to claim 1,

    Configuration information for a particular channel of the second system is received upon RRC connection release in the first system.
13. In a user equipment (UE) configured to operate in a first system in a radio resource control (RRC) connected mode,

    A radio frequency (RF) transceiver; And

    And a processor that is operatively connected with the RF transceiver, wherein the processor controls the RF transceiver

    Receiving configuration information for a specific channel of a second system from a base station,

    Receiving the specific channel in the second system based on the configuration information in an RRC idle mode,

    And perform a random access procedure in the first system or the second system in response to the received particular channel.
14. An apparatus for a user equipment (UE) configured to operate in a first system in a radio resource control (RRC) connected mode, the apparatus comprising:

    A memory containing executable code; And

    Including a processor connected to the memory when the operation,

    The processor is configured to execute the executable code to perform specific operations, wherein the specific operations are:

    Receiving configuration information for a specific channel of the second system from the base station;

    Receiving the specific channel in the second system based on the configuration information in an RRC idle mode;

    And performing a random access procedure in the first system or the second system in response to the received particular channel.

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