WO2017196083A1

WO2017196083A1 - Method and apparatus for transmitting setting information of resource for control channel, method and apparatus for transmitting setting information of resource for uplink drs, method and apparatus for transmitting indicator indicating type of subframe/slot, and method and apparatus for transmitting number of downlink symbols

Info

Publication number: WO2017196083A1
Application number: PCT/KR2017/004842
Authority: WO
Inventors: 김철순; 김지형; 문성현; 박주호
Original assignee: 한국전자통신연구원
Priority date: 2016-05-13
Filing date: 2017-05-10
Publication date: 2017-11-16

Abstract

A transmission method of a base station is provided. The base station sets a first resource for a physical downlink control channel (PDCCH). The base station includes setting information of the first resource in a first physical broadcast channel (PBCH). Then, the base station transmits the first PBCH.

Description

Method and apparatus for transmitting resource configuration information for control channel, Method and apparatus for transmitting resource configuration information for uplink DRS, Method and apparatus for transmitting indicator indicating type of subframe / slot, and downlink Method and apparatus for transmitting the number of link symbols

The present invention relates to a method and apparatus for transmitting configuration information of a resource for a control channel.

The present invention also relates to a method and apparatus for transmitting configuration information of a resource for an uplink discovery reference signal (DRS).

The present invention also relates to a method and apparatus for transmitting an indicator indicating a type of a subframe / slot.

The present invention also relates to a method and apparatus for transmitting the number of downlink symbols.

The wireless communication system supports the frame structure according to the standard. For example, a 3rd generation partnership project (3GPP) long term evolution (LTE) system supports three types of frame structures. The three types of frame structures include a type 1 frame structure applicable to frequency division duplexing (FDD), a type 2 frame structure applicable to time division duplexing (TDD), and a type 3 frame for transmission of unlicensed frequency bands. Include a structure.

In a wireless communication system such as an LTE system, a transmission time interval (TTI) means a basic time unit in which an encoded data packet is transmitted through a physical layer signal.

The TTI of the LTE system consists of one subframe. That is, the time axis length of the physical resource block (PRB) pair, which is the minimum unit of resource allocation, is 1 ms. In order to support transmission of 1 ms TTI, physical signals and channels are also mostly defined in subframe units. For example, a cell-specific reference signal (CRS) is fixedly transmitted in every subframe, a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), and a PUSCH (physical) uplink shared channel) may be transmitted for each subframe. On the other hand, the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) exist in every fifth subframe, and the physical broadcast channel (PBCH) exists in every tenth subframe.

On the other hand, research for the next generation communication system is in progress. There is a need for a transmission and reception method for a next generation communication system.

An object of the present invention is to provide a method and apparatus for transmitting configuration information of a control channel resource.

Another object of the present invention is to provide a method and apparatus for transmitting configuration information of a UL DRS resource.

Another object of the present invention is to provide a method and apparatus for transmitting an indicator indicating a type of a subframe / slot.

Another object of the present invention is to provide a method and apparatus for transmitting the number of DL symbols.

According to an embodiment of the present invention, a transmission method of a base station is provided. The transmission method of the base station includes: setting a first resource for a physical downlink control channel (PDCCH); Including the configuration information of the first resource in a first physical broadcast channel (PBCH); And transmitting the first PBCH.

The configuration information of the first resource may include an index of a resource block (RB) where the first resource starts and a bandwidth occupied by the PDCCH.

The transmission method of the base station includes: setting a second resource for an uplink (UL) discovery reference signal (UL) transmitted by a terminal; And including the configuration information of the second resource in the first PBCH.

The setting of the second resource may include setting the second resource to the same number as the number of virtual sectors used by the base station.

Including the configuration information of the second resource in the first PBCH, the bit corresponding to the number of virtual sectors used by the base station when the first PBCH is transmitted cell-specific (cell-specific) Generating a first PBCH having a bit width; And generating the plurality of first PBCHs for the virtual sectors when the first PBCH is transmitted virtually sector-specific.

The transmitting of the first PBCH may include transmitting a first synchronization signal (SS) burst including the first PBCH, a first primary synchronization signal (PSS), and a first secondary synchronization signal (SSS). step; And transmitting a second SS burst including a second PBCH, a second PSS, and a second SSS having the same RV as the redundancy version (RV) of the first PBCH.

The transmitting of the first PBCH may include transmitting a first synchronization signal (SS) burst including the first PBCH, a first primary synchronization signal (PSS), and a first secondary synchronization signal (SSS). step; And transmitting a second SS burst including a second PBCH, a second PSS, and a second SSS having an RV different from the redundancy version (RV) of the first PBCH.

The scrambling resource for the first PBCH may be different from the scrambling resource for the second PBCH.

The cyclic redundancy check (CRC) mask for the first PBCH may be different from the CRC mask for the second PBCH.

In addition, according to another embodiment of the present invention, a transmission method of a base station is provided. The transmission method of the base station includes: generating a first indicator indicating a type of a slot; Including the first indicator in a physical downlink control channel (PDCCH); And transmitting the PDCCH to a terminal through a fixed downlink (DL) resource.

The first indicator may indicate whether the slot is a DL slot, a DL-centric slot, an UL slot, or an uplink (UL) -centric slot.

In the case where the slot is the DL slot, there may be no UL region in the slot.

When the slot is the UL slot, there may be no DL region in the slot.

If the slot is the DL-centric slot, the DL area of the slot may be larger than the UL area of the slot.

If the slot is the UL-centric slot, then the UL area of the slot may be larger than the DL area of the slot.

The transmitting of the PDCCH may include transmitting the first indicator by using one or more first REGs corresponding to identification information of the base station among resource element groups (REGs) belonging to the fixed DL resource. Can be.

The transmission method of the base station may further include mapping a PDCCH candidate different from the PDCCH to remaining REGs other than the one or more first REGs among the REGs.

The transmitting of the first indicator by using the one or more first REGs may include placing the one or more first REGs in a time domain symbol that is at the earliest of time domain symbols belonging to the slot.

The transmitting of the first indicator using the one or more first REGs may include mapping the one or more first REGs to a plurality of frequencies.

In addition, according to another embodiment of the present invention, a transmission method of a base station is provided. The transmission method of the base station includes: determining a number of time domain symbols for downlink (DL) among time domain symbols belonging to a slot; Determining a type of the slot; And transmitting a first channel including the determined number and the determined type through a common search space for a control channel.

The first channel may be decoded even by a terminal that is not connected to the radio resource control (RRC).

The transmitting of the first channel may include one or more first REGs for transmitting a first indicator indicating the determined type among resource element groups (REGs) belonging to a resource for the control channel. And positioning the time domain symbol at the earliest of the time domain symbols.

The transmitting of the first channel may include transmitting one or more first REGs for transmitting a first indicator indicating the determined type from among resource element groups (REGs) belonging to a resource for the control channel, to a plurality of frequencies. Mapping may include.

The time domain symbols for the DL may be used for radio resource management (RRM) measurement or channel state information (CSI) measurement.

According to an embodiment of the present invention, a method and apparatus for transmitting configuration information of a control channel resource may be provided.

In addition, according to an embodiment of the present invention, a method and apparatus for transmitting configuration information of a UL DRS resource may be provided.

In addition, according to an embodiment of the present invention, a method and apparatus for transmitting an indicator indicating a type of a subframe / slot may be provided.

In addition, according to an embodiment of the present invention, a method and apparatus for transmitting the number of DL symbols may be provided.

In addition, according to an embodiment of the present invention, a method and apparatus for transmitting and receiving system information may be provided.

In addition, according to an embodiment of the present invention, a method and apparatus for measuring RRM (radio resource management) may be provided.

1 is a diagram illustrating a subframe / slot type applicable to RRM measurement in the case of 3GPP NR TDD according to an embodiment of the present invention.

2 is a diagram illustrating a case where a 3GPP NR TDD is configured with a special subframe / slot in which both a DL region and a UL region are allocated according to an embodiment of the present invention.

3 is a diagram illustrating a case in which a subframe / slot used for RRM measurement is configured to be UE-specific (eg, UE-specific) according to an embodiment of the present invention.

4 is a diagram illustrating a scenario regarding RRM measurement performed by a terminal according to an embodiment of the present invention.

5 is a diagram illustrating RE mapping of DL NR-DRS resources according to an embodiment of the present invention.

6 is a diagram illustrating resources that a 3GPP NR reference system has in one subframe / slot.

7 is a diagram illustrating a method RSSI0-1, in accordance with an embodiment of the present invention.

8 is a diagram illustrating a method RSSI0-1-1, in accordance with an embodiment of the present invention.

9 is a diagram illustrating a method RSSI0-1-2, in accordance with an embodiment of the present invention.

10 is a diagram illustrating a method RSSI0-2, in accordance with an embodiment of the present invention.

11 is a diagram illustrating a method RSSI0-2-1, in accordance with an embodiment of the present invention.

12 is a diagram illustrating a method RSSI0-2-2 for a method RSSI0-2, according to an embodiment of the present invention.

13 is a diagram illustrating a method RSSI0-2-3, in accordance with an embodiment of the present invention.

14 illustrates NR-SIB transmission according to an embodiment of the present invention.

15 illustrates a virtual sector of a base station according to an embodiment of the present invention.

16A and 16B illustrate a procedure for transmitting an NR-SIB to a terminal by a base station according to an embodiment of the present invention.

17 illustrates a computing device, in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In this specification, duplicate descriptions of the same components are omitted.

Also, in the present specification, when a component is referred to as being 'connected' or 'connected' to another component, the component may be directly connected to or connected to the other component, but in between It will be understood that may exist. On the other hand, in the present specification, when a component is referred to as 'directly connected' or 'directly connected' to another component, it should be understood that there is no other component in between.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Also, in this specification, the singular forms may include the plural forms unless the context clearly indicates otherwise.

Also, as used herein, the term 'comprises' or 'having' is only intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more. It is to be understood that it does not exclude in advance the possibility of the presence or addition of other features, numbers, steps, actions, components, parts or combinations thereof.

Also in this specification, the term 'and / or' includes any combination of the plurality of listed items or any of the plurality of listed items. In the present specification, 'A or B' may include 'A', 'B', or 'both A and B'.

Further, in the present specification, a terminal includes a mobile terminal, a mobile station, an advanced mobile station, a high reliability mobile station, a subscriber station, It may also refer to a portable subscriber station, an access terminal, a user equipment (UE), a machine type communication device (MTC), or the like. May include all or part of the functionality of a mobile station, a high-reliability mobile station, a subscriber station, a portable subscriber station, an access terminal, user equipment, MTC, and the like.

In addition, in the present specification, a base station (BS) includes an advanced base station (BS), a high reliability base station (HR-BS), a node B (NB), and an advanced node B ( eNB: evolved node B), new radio node B (gNB), access point, radio access station, base transceiver station, mobile multihop relay (MSR) -BS , A relay station serving as a base station, a high reliability relay station serving as a base station, a repeater, a macro base station, a small base station, a femto base station, a home node B (HNB), a home Also referred to as eNB (HeNB), pico base station (pico BS), micro base station (micro BS) and the like, advanced base station, HR-BS, Node B, eNB, gNB, access point, radio access station, transmit and receive base station, MMR-BS, repeater, high reliability repeater, repeater, macro base station, small base station, femto base station, HNB, HeNB, pico base station, mi A it may include all or some of the features of such a base station.

Hereinafter, a method of transmitting and receiving system information in a mobile communication system will be described. A method for initial cell search of a new radio (NR) system will now be described. Next, a method of measuring RRM (radio resource management) will be described. Next, a method of including an NR-PDCCH resource in a physical broadcast channel (NR-PBCH) will be described. A method of including uplink (UL) discovery reference signal (NR-DRS) resources in the NR-PBCH will be described. Next, a method of transmitting the redundancy version (RV) of the NR-PBCH based on a specific combination will be described. A method of indicating a subframe / slot type will be described. In this specification, a subframe / slot means a subframe or a slot. In addition, in the present specification, a slot may mean a slot or a subframe. A method of designing a physical subframe / slot type indicator channel (PSTICH) will be described. And it describes how to measure the received signal strength indicator (RSSI). Next, an area of the RSSI measurement resource will be described. In the present specification, NR-PDCCH may be represented by PDCCH, NR-DRS may be represented by DRS, NR-PBCH may be represented by PBCH, and NR-PHICH may be represented by PHICH.

In a wireless communication system, a cell periodically transmits a reference signal (RS), and the terminal receives the RS. The terminal detects the presence of the cell from the received RS, and determines the quality of the radio link formed from the cell to the terminal. Various methods can be applied to the quality of a radio link depending on the purpose of the application. The terminal measurement defined in technical specification 36.213 includes channel state information (CSI) measurement. The terminal measurement defined in TS 36.214 includes a reference signal received power (RSRP), a reference signal received quality (RSRQ), a received signal strength indicator (RSSI), and a signal to interference plus noise ratio (RS-SINR).

CSI measurement is performed by a terminal (eg, RRC_CONNECTED UE) that is connected to a radio resource control (RRC). When a physical downlink shared channel (PDSCH) is transmitted in a CSI reference resource, a CSI report is generated such that a block error rate (BLER) corresponds to 10%.

The RS corresponding to the transmission mode (TM) set by the serving cell (or serving cell base station) is different. For example, in the case of TM 5, RS is a cell-specific reference signal (CRS), and in the case of TM 10, RS is CSI-RS. Accordingly, a precoding matrix indicator (PMI), a rank indicator (RI), a channel quality indicator (CQI), or a CSI-RS resource indicator (CRI) is derived. In the present specification, a cell may mean a base station that provides or services a cell.

RSRP measurement is performed by a terminal (eg, RRC_CONNECTED UE) that is RRC connected to the base station and a terminal (eg, RRC_IDLE UE) that is not RRC connected to the base station. To this end, CRS antenna port 0 may be used, and CRS antenna port 0 and CRS antenna port 1 may also be used. Since the UE already knows the sequence (sequence) constituting the CRS and already knows the time domain boundary of the symbol including the CRS, the UE measures the RSRP through an appropriate reception algorithm in the RE including the CRS. In this specification, the time domain symbol may be an orthogonal frequency division multiplexing (OFDM) symbol, a single carrier (SC) -frequency division multiple access (FDMA) symbol, or the like. However, this is only an example, and the present invention may be applied to a case where the time domain symbol is a symbol different from an OFDM symbol or an SC-FDMA symbol. In the present specification, a time domain symbol may be represented by a symbol. The number of subcarriers used by the UE depends on the measurement bandwidth (eg, AllowedMeasBandwidth) allowed by the serving cell. The UE utilizes only subframes / slots allowed by the measurement subframe pattern (eg, MeasSubframePattern) set by the serving cell for RSRP measurement. The UE utilizes only subframes / slots belonging to discovery reference signal measurement timing configuration (DMTC) for RSRP measurement. The unit of RSRP is dBm, which is converted into a natural number defined in TS and expressed.

RSRQ measurement is performed by a terminal (eg, RRC_CONNECTED UE) that is RRC-connected to the base station and a terminal (eg, RRC_IDLE UE) that is not RRC-connected to the base station. RSRQ is defined as the ratio between RSRP and RSSI. RSSI measurement is performed on the OFDM symbol including the CRS antenna port 0, or if there is a separate configuration by the serving cell, all OFDM symbols are utilized for RSSI calculation. Only subcarriers belonging to the physical resource block (PRB) used for RSRP measurement are used for RSSI measurement. The subframe / slot used by the UE for RSSI measurement corresponds to the subframe / slot utilized for RSRP measurement. The unit of RSRQ is dB, and is converted into an integer defined in TS and expressed.

When the terminal separately measures the RSSI, the terminal (eg, RRC_CONNECTED UE) connected to the base station performs the RRC_CONNECTED UE, and measures the RSSI only in the subframe / slot configured by the RSSI (RSSI measurement timing configuration). The number of OFDM symbols utilized for RSSI measurement may be set by the RMTC. RSSI measurement timing uses downlink (DL) timing of the serving cell. The unit of RSSI is dBm, which is converted into a natural number defined in TS and expressed.

RS-SINR measurement is performed by a terminal (eg, RRC_CONNECTED UE) connected to an RRC to a base station, and performed in an RE including a CRS antenna port 0. RS-SINR measurement is performed in subframes / slots allowed by the serving cell. The unit of RS-SINR is dB and is converted into a natural number defined in TS and expressed.

CSI-RSRP measurement is performed by a terminal (eg, RRC_CONNECTED UE) connected to the base station RRC, and performed in the RE including the CSI-RS antenna port 15. The UE measures the CSI-RSRP in the subframe / slot belonging to the subframe / slot configured by the DMTC. The subcarriers belonging to the bandwidth allowed by the serving cell are utilized for CSI-RSRP measurement. The unit of CSI-RSRP is dBm, which is converted into a natural number defined in TS and expressed.

The serving cell may utilize the measurement of such a terminal for various purposes. The link adaptation of the serving cell may perform DL scheduling according to the CQI of the terminal (eg, RRC_CONNECTED UE) connected to the base station RRC. Depending on the TM configured for the UE, a single user (SU) -multiple input multiple output (MIMO) operation or a multiple user (MU) -MIMO operation may be performed, and an open loop MIMO operation may be performed. DL load balancing of the serving cell resets an RRC connection to the UE so that cell reselection is performed according to RSRP or RSRQ of a UE (eg, RRC_CONNECTED UE) connected to the base station. do. The handover of the serving cell uses RSRP or RSRQ to support mobility of a terminal (eg, RRC_CONNECTED UE) that is RRC connected to the base station.

In the case of the frequency at which the serving cell operates, the UE may perform RRM measurement only on the DL subframe / slot. However, in case of inter-frequency RRM measurement or when a neighbor cell is considered in long term evolution (LTE) time division duplexing (LDD), the UE has a specific subframe / slot in a DL subframe. You should be able to determine if it is a slot. To this end, the serving cell is configured with a measurement object configuration, a cell ID list, a TDD uplink (DL) -DL subframe / slot configuration, and a multimedia broadcast multicast service (MBSFN). over single frequency network) configures a subframe / slot configuration to the UE. The UE thus extracts a valid DL subframe / slot and uses it for RRM measurement.

3rd generation partnership project (3GPP) new radio (NR) supports the service scenarios of enhanced mobile broadband (eMBB), the service scenarios of ultra-reliable low latency communication (URLLC), and the service scenarios of massive machine type communications (mMTC). To study technical requirements.

eMBB wants to handle large amounts of traffic. URLLC seeks to reduce the end-to-end (L2) L2 (layer 2) latency and to reduce the L1 (layer 1) packet error rate. The mMTC intends to serve traffic through occasional serving cell base stations when the terminals are distributed at a high geographical density. The present invention may contemplate the case where eMBB and URLLC are supported at least simultaneously, and where possible with mMTC. In particular, in order to support URLLC, channel encoders and channel decoders or codewords can be designed to have a shorter transmission time interval (TTI) and a shorter processing time. There is a way to reduce the code size.

To define a shorter TTI, a method of reducing the number of time domain symbols constituting the TTI or a method of reducing symbol length by extending subcarrier spacing constituting a multicarrier symbol is applied. Can be.

Mixed numerology, which operates by setting a plurality of subcarrier spacings, is one of the features that distinguish 3GPP NR from 3GPP LTE.

If an operator with an unpaired spectrum deploys the 3GPP NR system, the system can be operated with TDD. In order to operate a system like frequency division duplexing (FDD) by dividing the DL subband and the UL subband in one system carrier, a large number of guard bands are required. And if only a few guard bands are allocated, full duplex processing should be considered because in-band emission is large. However, due to the UL-DL mismatch between the cells and the UL-DL mismatch between the terminals, a situation in which interference strength is much larger than signal strength often occurs. However, because the analog to digital converter (ADC) resolution is finite, if a large amount of interference is received, the ADC may operate at a large size, which may cause the ADC to detect a relatively weak signal. . Because of this, it is difficult for full duplex processing to always be used.

3GPP NR, on the other hand, considers both the use of high frequencies above 6 GHz and low frequencies below 6 GHz. Since the high frequency band of 6 GHz or more has a wide bandwidth, 3GPP NR can allocate a sufficient guard band even on a single system carrier and operate the system like FDD. However, when the 3GPP NR system is deployed in the high frequency region of 6 GHz or more, MIMO processing must be taken into consideration because propagation path loss of a wireless channel is large. Since such MIMO is based on a phased array, the amount of MIMO gain varies greatly according to channel estimation accuracy. If FDD is used, uplink channel feedback for a large number of DL antenna ports requires uplink signal overhead. On the other hand, when the system is operated with TDD, if channel reciprocity is used and the transmitter unit (TxU) and the receiver unit (RxU) are properly calibrated, the DL channel response through the UL signal This can be estimated. If TDD is used, the uplink signal overhead can be avoided. In other words, if TDD is used, a larger number of antenna ports can be defined.

Considering scenarios that support both eMBB and URLLC using TDD, the low latency performance of URLLC should be improved. In the case of 3GPP LTE TDD, the serving cell base station defines an UL-DL subframe / slot pattern for the terminal through RRC configuration. In case of DL traffic, if the serving cell base station transmits scheduling assignment and DL data to the terminal in the DL subframe / slot, the terminal transmits UL HARQ (hybrid automatic repeat and request) in the UL subframe / slot. send. Thus, the L1 delay of DL traffic depends on the frequency with which DL subframes / slots and UL subframes / slots appear. In case of UL traffic, if the serving cell base station transmits a scheduling grant to the terminal in the DL subframe / slot, the terminal transmits the UL data in the UL subframe / slot, and the serving cell base station transmits the DL HARQ. Transmit in DL subframe / slot. Therefore, the L1 delay of the UL traffic depends on the frequency at which DL subframes / slots and UL subframes / slots appear.

On the other hand, in the scenario of supporting URLLC using FDD, since there is always a DL subframe / slot and a UL subframe / slot, the L1 delay of the FDD is always equal to or less than the L1 delay of the TDD.

To compensate for this disadvantage, a method of converting a subframe / slot pattern in each subframe / slot may be used. The terminal that receives the scheduling assignment from the serving cell base station considers the corresponding subframe / slot as a DL subframe / slot. The terminal that receives the scheduling grant from the serving cell base station regards the corresponding subframe / slot as an UL subframe / slot. The UE belonging to other cases does not assume the corresponding subframe / slot as a DL subframe / slot and also does not assume a UL subframe / slot. When this method is applied to 3GPP NR, in order for idle terminals to perform RRM measurement, the serving cell base station should always allocate some radio resources as fixed DL resources. The serving cell base station may define this fixed DL resource in a particular subframe / slot. The fixed DL resource may include information such as a discovery reference signal (DRS), a physical downlink control channel (PDCCH), and a system information block (SIB). 3GPP NR calls this approach dynamic TDD. If the 3GPP NR TDD is operated as a dynamic TDD, the L1 delay of the URLLC scenario can be reduced because the serving cell base station can allocate any UL resource and any DL resource as needed. Dynamic TDD is one of the distinguishing features of 3GPP NR and 3GPP LTE.

In the case of 3GPP LTE TDD, the UE may predict DL resources in advance in DL subframes / slots or special subframes / slots. For example, since the DL resource means all subcarriers of the DL symbol allowed by the subframe / slot type, the 3GPP LTE terminal can measure the RSSI using all the DL symbols, and RSRP in the subcarrier including RS. Can be measured. Even in the case of inter-frequency measurement, the 3GPP LTE terminal can easily determine the subframe / slot type of a specific subframe / slot. For example, if the UE detects a primary synchronization signal (PSS), it may be assumed that the corresponding subframe / slot is a special subframe / slot or a DL subframe / slot. If the UE detects a secondary synchronization signal (SSS), it may be assumed that the corresponding subframe / slot is a DL subframe / slot. If the UL-DL subframe configuration is configured for the 3GPP LTE UE, if the 3GPP LTE UE knows the subframe / slot index of the corresponding subframe / slot, the type of the subframe / slot to be shown later will be previously determined. Able to know.

On the other hand, when 3GPP NR TDD is operated as dynamic TDD, fixed DL resources are determined in the TS regardless of subframe / slot type. This is because initial access is allowed even if the 3GPP NR terminal is in an idle state and the corresponding cell does not have separate prior information. The fixed DL resource includes at least NR-PDCCH and DL NR-DRS. The fixed DL resource may have one numerology.

Subframe / slot types that may be applied to the 3GPP NR TDD system may include at least the cases illustrated in FIGS. 1, 2, and 3 (reference system).

1 is a diagram illustrating a subframe / slot type applicable to RRM measurement in the case of 3GPP NR TDD according to an embodiment of the present invention. In FIG. 1, the horizontal axis represents subframes / slots, and the vertical axis represents carrier bandwidths.

Specifically, in FIG. 1A, a DL-centric subframe / slot is illustrated. The fixed DL resource includes a first symbol among a plurality of symbols belonging to a subframe / slot and is transmitted at an earlier time point (eg, in front of a slot). A symbol including a fixed DL resource is assumed to be a DL region in all subcarriers. After that, all other symbols are used as DL regions. This corresponds to GP (guard period) = 0. If necessary (eg GP ≧ 1), the GP may be set via RRC or a GP may be defined in the TS, in which case the symbol corresponding to the GP is not assumed to be a DL region. In the DL region, DL data including several numerology can be set.

In FIG. 1B, a UL-centric subframe / slot is illustrated. The fixed DL resource includes a first symbol of a plurality of symbols belonging to a subframe / slot, and is transmitted at an earlier time point (eg, in front of a slot). A symbol including a fixed DL resource is assumed to be a DL region in all subcarriers. The symbol located next to the fixed DL resource corresponds to the GP. In consideration of the processing delay and the timing advance command of the terminal, the serving cell base station must set an appropriate number of symbols for the GP. do. The GP does not belong to the DL region or to the UL region in all subcarriers. The symbol (s) located after the GP correspond to a UL region, and UL data is allocated to the symbol (s).

2 is a diagram illustrating a case where a 3GPP NR TDD is configured with a special subframe / slot in which both a DL region and a UL region are allocated according to an embodiment of the present invention. 2 illustrates subframes / slots applied to RRM measurement. In FIG. 2, the horizontal axis represents subframes / slots, and the vertical axis represents carrier bandwidths.

A DL region is allocated before a symbol assigned as a GP in the middle region of a subframe / slot, and a UL region is allocated after a symbol assigned as a GP. The DL region contains at least fixed DL resources. The UL region includes at least one symbol for each subframe / slot.

Specifically, (a) of FIG. 2 illustrates a DL-centric special subframe / slot. The DL region occupies most of the subframes / slots.

In FIG. 2B, a UL-centric special subframe / slot is illustrated. The UL region occupies most of the subframes / slots than the DL region including the fixed DL resources.

The serving cell base station may utilize such DL-centric subframes / slots or UL-centric subframes / slots differently for each subframe / slot.

3 is a diagram illustrating a case in which a subframe / slot used for RRM measurement is configured to be UE-specific (eg, UE-specific) according to an embodiment of the present invention. In Figure 3, the horizontal axis represents subframes / slots, and the vertical axis represents carrier bandwidths.

FIG. 3A illustrates DL-centric subframes / slots, FIG. 3B illustrates UL-centric subframes / slots, and FIG. 3C Special subframes / slots are illustrated.

Specifically, as illustrated in (a) of FIG. 3, the serving cell base station has a cell-specific subframe / slot type fixed to a special subframe / slot. Or DL resources). As illustrated in FIG. 3B, the serving cell base station may grant UL data (or UL resource) to the terminal. As illustrated in (c) of FIG. 3, the serving cell base station may allocate (or schedule, grant) DL data (or DL resources) and UL data (or UL resources) in the same subframe / slot.

In the case of FIG. 3, a separate GP is not cell-specific and a DL region and an UL region are defined.

The 3GPP NR cell can implicitly allocate a UE-specific (eg, UE-specific) GP, thereby reducing GP overhead. Since there is no cell-specific GP, the scheduler must adjust the DL-UL interference to perform scheduling. For example, a serving cell allocates different subframes / slot types to two different UEs UE1 and UE2, and the two UEs UE1 and UE2 have a similar geographical location at the edge of coverage (eg, cell edge). In the case of having a location, a propagation delay is large for a UE UE1 allocated with a DL-centric subframe / slot, and a UE UE2 assigned with a UL-centric subframe / slot. ), The timing advance (timing advance) is large. In this case, interference occurs in a particular symbol, terminal UE1 acts as a victim and terminal UE2 acts as an attacker. Therefore, the serving cell base station must appropriately adjust the number of symbols occupied by the DL data and the number of symbols occupied by the UL data, and perform adjustment to prevent the above-described interference scenario.

On the other hand, since the mobile communication system is mainly deployed in a low band having good propagation characteristics (for example, 2 GHz), even if the base station does not perform separate beamforming, it is relatively that the terminal receives the information. It is easy. For example, in the case of 3GPP LTE, base station antennas are installed at relatively high locations (eg, on the roof of a building). Since the terminals are in a relatively low position, the base station antenna is steered at an angle slightly lower than horizontal. This is mechanical tilting. In order to perform electrical tilting, the base station receives feedback of channel information from the terminal and performs precoding in baseband. This can be interpreted in response to electrical steering.

The base station periodically transmits a synchronization signal (eg, PSS, SSS) and a cell common signal (eg, CRS) by using mechanical steering, and also periodically transmits a physical broadcast channel (PBCH) even if there is no separate baseband preprocessing. . The UE receives the PSS, the SSS, the CRS, and the PBCH to obtain synchronization, and decodes a MIB (master information block) included in the PBCH. This information may be used for PDCCH discovery and SIB reception.

On the other hand, if a mobile communication system operating in a high band (eg, 60 GHz) is considered, the base station can transmit information to the terminal through separate beamforming. Since the diffraction and reflection characteristics of radio waves are not good, propagation properties are generally poor. Therefore, in order for the base station to transmit data to the terminal, not only mechanical steering but also electrical steering can be used. And the essential system information delivered to the terminal, the base station can be efficiently transmitted using the beam forming. The base station may determine such beamforming through feedback information from the terminal. For example, according to the Institute of Electrical and Electronic Engineers (IEEE) 802.11 ad, a beam sweeping procedure is performed in order for a terminal to communicate with a base station in a wireless communication system operating in a tens GHz band.

The beam sweeping procedure consists of two steps. In the first step of the beam sweeping procedure, all base station sectors each form a rough beam to transmit a predetermined packet, which is received by the terminal. The terminal selects one of a plurality of base station sectors and feeds back the index of the selected base station sector to the base station.

In the second step of the beam sweeping procedure, after the base station receives the feedback from the terminal, the terminal forms a fine beam within the base station sector selected by the terminal to transmit a predetermined packet, which is received by the terminal. The terminal feeds back the beam index of one beam among the multiple thin beams to the base station. The base station can know a thin beam that can be used when transmitting data to the terminal.

This beam sweeping procedure has a complexity that is directly proportional to the sum of the number of thick beams formed by the base station and the number of thin beams formed per sector. If the base station forms only a thin beam and transmits it to the terminal, a larger number of beams are transmitted. Thus, this is inefficient.

In order to use the two-step beam sweeping procedure, it is necessary to assume that there is a reliable feedback link from the terminal to the base station. However, in order for the terminal to perform feedback, the terminal needs system information for allocating resources from the base station. Therefore, the above-described beam sweeping procedure cannot be applied to the mobile communication system. Since a base station or a terminal needs to perform repetition or transmit at a low code rate in order to reduce an error probability, transmission resources must be additionally allocated.

Therefore, in order to transmit data (eg, NR-PDSCH) in an NR system operating at several tens of GHz, a beam-formed control channel (eg, NR-PDCCH) must be transmitted to the UE. This also applies to system information (eg NR-SIB). The UE may know the location of a resource (eg, NR-PDSCH) in which the NR-SIB exists from the DL assignment received through the NR-PDCCH. Since the base station needs the feedback of the terminal to determine the beamforming method, a separate physical channel is required to indicate this. NR-PBCH plays this role. The base station periodically transmits the NR-PBCH using resources determined by the standard. If the base station uses beam sweeping, the base station may continuously transmit the NR-PBCH assuming an NR synchronization signal and a predetermined relative resource position. For each transmission, the base station can use different beams.

The terminal decodes the NR-PBCH in a radio resource defined in the standard. Hereinafter, the property which NR-PBCH has is described. The NR-subframe may be represented by an NR-slot as the case may be. The NR-subframe is a unit composed of x symbols (where x = 7 or 14). Therefore, the length of the NR-subframe may differ for each neurolage.

In the 3GPP LTE system, the LTE-PBCH periodically transmitted by the base station includes LTE-MIB. The information transmitted by the LTE-MIB corresponds to a system bandwidth, physical hybrid automatic repeat and request indicator channel (LTE-PHICH) allocation information, and a system frame number (SFN).

The system bandwidth informs the terminal of the sequence length of the LTE-CRS and may also inform the range in which the LTE-PDCCH resources are distributed.

LTE-PHICH allocation information is necessary for detecting the position of a control channel element (CCE). In the LTE-PDCCH resource, a resource element group (REG) that does not allocate a CCE and a REG that allocates a CCE are distinguished.

SFN is information necessary to interpret the SIB scheduling information and the SI (system information) window included in the LTE-SIB type 1. The temporal location of the LTE-subframe / slot in which the SIB is received is defined by the TS, and the terminal receives the frame synchronization through the SFN and receives the LTE-SIB type 1.

The LTE-PBCH includes an LTE-MIB and is transmitted every radio frame (eg, 10 ms). Channel coding and message size of LTE-PBCH are defined in TS.

LTE-SIB Type 1 is transmitted every two radio frames (eg, 20 ms). The subframe in which the LTE-SIB type 1 is transmitted is defined in the TS, but the channel coding and the message size of the LTE-SIB type 1 are indicated by the LTE-PDCCH to which dynamic scheduling is applied.

System information other than the LTE-SIB type 1 is limited to the type specified by the scheduling information list (eg, schedulingInfoList) included in the LTE-SIB type 1, and is sequentially transmitted by the base station.

According to the formula defined in the TS, the UE determines the LTE-PDCCH in the subframe (s) belonging to the number of window lengths (eg, si-WindowLength) on the basis of a specific subframe index. Decode the LTE-SIB by blind decoding.

LTE-SIB is included only once within a window (eg, si-Window) and the UE cannot know in advance the subframe index from which the LTE-SIB is received, and the LTE-SIB type can be known in advance through LTE-SIB Type 1 have. This type is uniquely determined.

The information included in the LTE-SIB type 1 is information about time domain scheduling of another SIB and information about suitability for cell selection. LTE-SIB type 2 includes information about a common channel and a shared channel. LTE-SIB Type 3, Type 4, Type 5, Type 6, Type 7, and Type 8 include intra-frequency cell reselection, inter-frequency cell reselection, and Includes parameters required for inter-RAT cell reselection.

The NR-PBCH does not necessarily need the above-mentioned information. If the NR-PDCCH is not distributed over the entire band, the base station does not need to inform the terminal of the system bandwidth. In addition, NR applies an adaptive and non-synchronous HARQ-ACK (acknowledgment) to both the DL and UL, so that the base station may not transmit the NR-PHICH. Alternatively, even if the base station transmits the NR-PHICH, the NR may be designed such that the NR-PDCCH and the NR-PHICH do not use the REG as a common resource pool. In this case, the NR-PBCH does not contain PHICH information. And if the base station does not perform the SIB transmission periodically, and performs the SIB transmission on-demand (on-demand) as the request (request) of the terminal, NR does not require the SFN. Therefore, if the design of the NR-PDCCH is different from the design of the LTE-PDCCH, the base station does not need to transmit the MIB and may include the above-described SFN and PHICH information in the NR-SIB transmitted by the base station to the terminal.

However, in order for the base station to transmit the NR-PDCCH, an appropriate preprocessing must be performed. If the base station receives separate information and can perform beamforming of terminals based on the information (eg, non-standalone scenario), proper beamforming for the NR-PDCCH may be performed. However, if the NR operates alone (eg, standalone scenario), information for preprocessing to be applied to the NR-PDCCH may be obtained through UL feedback from the terminal.

This corresponds to a case where UL based UE discovery (eg, UE discovery) is performed. The terminal transmits the UL NR-DRS to the base station. Here, UL NR-DRS means a signal of the physical layer transmitted by the terminal regardless of the separate base station configuration. The terminal may transmit the UL NR-DRS even if the terminal does not know power control and timing advance. This does not mean only the physical random access channel (NR-PRACH) preamble.

The base station (eg, serving cell base station) may receive the UL NR-DRS and recognize the presence of one or more terminals. The base station may form a reception beam by implementation, and may use it for preprocessing based on channel reciprocity.

If the base station cannot utilize channel equivalency, the UE may perform Tx beam sweeping using a UL NR-DRS occlusion in which UL NR-DRS is transmitted several times. The resource of the UL NR-DRS transmitted by the terminal may be set to one or more. The terminal may transmit the preprocessed NR-DRS in each UL NR-DRS resource. The preprocessing scheme utilized at this time may be separately instructed by the base station to the terminal. If there is no separate instruction for the preprocessing scheme, the UE may repeatedly transmit the UL NR-DRS to which the preprocessing is not applied or the same preprocessing is applied, in the UL NR-DRS resource.

UL NR-DRSs belonging to UL NR-DRS resource (s) do not necessarily have the same resource (frequency and time resource) and the same sequence identifier (ID). If the UE transmits unprocessed UL NR-DRS over several uplink slots, one long sequence (sequence) is used to transmit one UL NR-DRS sequence (sequence) over several uplink slots. Can transmit Alternatively, the length of one UL NR-DRS sequence (sequence) may be equal to or less than the length of one uplink slot, and the terminal may transmit several UL NR-DRS sequences (sequence) over several uplink slots. have. In this case, the UL NR-DRS sequences (sequences) do not necessarily have the same sequence identifier (ID) and the same resource (frequency and time resource).

The UE should be able to know the UL resources for UL feedback. The configuration information of the NR-SRS (sounding reference signal) assumes the configuration equivalent to the LTE SRS. The UE should be able to know the transmission power, transmission bandwidth, and timing advance of the NR-SRS.

In the case of the NR-PRACH preamble, a property equivalent to the LTE PRACH preamble is assumed. If the UE knows the resource location of the NR-PRACH preamble, and transmits the NR-PRACH preamble in the corresponding resource. The terminal determines the NR-PRACH preamble index through a function of the terminal identification information (eg, UE ID) or the terminal identification information and the slot index among the indexes belonging to the NR-PRACH preamble index set defined in the TS, and the determined NR-PRACH The preamble index is transmitted to the base station.

The base station receives the NR-PRACH preamble index, and may use this to estimate which virtual sector the terminal is located in or estimate the radio channel. The base station can use this estimated information for preprocessing based on channel equivalency. As such, since the amount of configuration information required by the NR-PRACH preamble is smaller than that of the NR-SRS, the NR-PRACH preamble can be utilized as the UL NR-DRS.

If the base station cannot utilize channel equivalency, the preprocessing of the UL NR-DRS is determined through a separate method. The base station may include UL NR-DRS preprocessing information of the terminal in the NR-PDCCH or a random access response to transmit to the terminal.

In order to use the channel equivalent assumed by the base station, it is advantageous that the radio resource where the UL NR-DRS received from the terminal is located and the radio resource to be transmitted by the base station are the same. In other words, a method of transmitting a UL NR-DRS by using a DL frequency resource may be considered. If the NR consists of TDD, this method may be used. Even when the NR is configured with FDD, the terminal may be allowed to use the DL frequency resource in order to maximize channel equivalentity.

In order for the base station to transmit configuration information of the NR-PRACH preamble to the terminal, the terminal must search for the presence of the base station. This corresponds to a case of performing DL based cell search or cell discovery. The base station transmits DL NR-DRS. Even if the UE does not have any information in advance, in order to receive and utilize the DL NR-DRS, the DL NR-DRS transmitted by the base station uses a radio resource defined in the specification. The sequence (sequence) of the DL NR-DRS is generated from an equation including at least an index of the virtual sector or identification information (eg, identification) of the virtual sector.

The preprocessing that the serving base station applies to one virtual sector is equally applied to the NR-DRS and NR-PBCH. In this specification, NR-DRS (or PSS, SSS) and NR-PBCH are referred to as SS bursts. Therefore, in this specification, one virtual sector corresponds one-to-one to one SS burst.

As an example of NR DL-DRS resources, NR-SSS (or NR-SSS resources) may be used as NR DL-DRS resources as well as downlink synchronization, or may be used for RSRP measurement, or NR-PBCH It can also be used for demodulation.

A method of transmitting a DL NR-DRS by a base station will be described. Specifically, a method of transmitting the NR-DRS in one step (hereinafter, 'method S1') and a method of transmitting the NR-DRS in two steps (hereinafter, 'method S2') will be described.

In the method S1, the base station allocates DL NR-DRS resources for each virtual sector, and the terminal receives the DL NR-DRS to estimate sequence (sequence) information of the DL NR-DRS. The UE can know the index i of the virtual sector to which the UE belongs from the DL NR-DRS sequence (sequence). The terminal may deliver the index i of the virtual sector to the base station using a reliable feedback link. Here, as a method of performing reliable feedback, a method of transmitting the UL NR-DRS by the aforementioned terminal may be considered. The terminal may implicitly deliver the index of the virtual sector to the base station by selecting a radio resource used by the UL NR-DRS. For example, if the base station configures several UL NR-DRS resources and the terminal selects the i-th UL NR-DRS resource among them and transmits the UL NR-DRS using the selected resources, the base station is a virtual sector to which the terminal belongs. Index i can be estimated. In this way, the base station estimates the index of the virtual sector and can form a narrower beam (sharp beam) toward the terminal by using the signal received from the terminal. In order for method S1 to be performed, the base station should be able to perform preprocessing using a signal from the terminal.

For example, to form a narrow beam directed by the base station to the terminal, the following equation may be considered. For convenience of explanation, a signal model without noise is assumed. The radio channel from the base station to the terminal is a matrix

It is expressed as

The DL channel (DL channel has the number of antennas of the base station in columns and the number of antennas of the terminal in rows) has a complex value. The preprocessing vector used by the base station while forming a virtual sector (index i) is

Can be expressed as

The length of corresponds to the number of antennas the base station has.

If it is assumed that there is one DL NR-DRS antenna port, since the base station associates the i th virtual sector with the i th DL NR-DRS resource, the same preprocessing vector

Is used. For convenience, the value of the i-th DL NR-DRS may be represented by one. The signal received by the terminal,

to be.

UE has separate linear matched filter vector for each resource of DL NR-DRS

Using, effective channel

Estimation The matching process at this time

Can be expressed as

Is obtained. Where complex number

Using

The size of (eg 2-norm) is set to one.

The UE indexes the largest absolute value of the result obtained after receiving the DL NR-DRS among the indexes

Get The terminal preprocesses the UL NR-DRS and transmits it to the base station, and the preprocessing vector applied to the case where there is one UL NR-DRS antenna port is

Use here,

Is

Means a complex conjugate of.

When the terminal transmits the UL NR-DRS at the DL frequency, the radio channel from the terminal to the base station due to channel equality is

It can be expressed as. For convenience, when UL NR-DRS is represented by 1, a signal received from a radio resource allocated by the base station corresponding to the i th virtual sector

Is,

Corresponds to The base station has a separate linear matched filter vector for each radio resource allocated corresponding to the i th virtual sector.

Effective channel using

Estimation The matching process at this time

Can be expressed as

Is obtained. Where complex numbers

Using

The size of (eg 2-norm) is set to one.

Now, the base station is a preprocessing vector for transmission to the terminal

By using this, system information (eg, NR-SIB) can be transmitted to the terminal using a data channel (eg, NR-PDSCH). Or when the base station transmits a control channel (eg, NR-PDCCH)

Can be applied.

If the base station to the terminal

When is applied as a preprocessing vector, the received signal of the terminal is

Expressed as

Corresponds to Here, 1 denotes an NR-DM (demodulation) -RS used by the base station for convenience.

Terminal already knows

Can be used to receive a signal. Terminal vector linear vector

Obtained using

silver,

It can be expressed as. This value is the strength received by the UE from the DL NR-DRS.

And the strength received by the UE in the DL NR-DM-RS.

Can be compared with

Through simplified skinny singular value decomposition

If expressed as

Is,

to be. here,

Is a square matrix with singular points as elements (eg positive real numbers).

Is

Represents the left singularity matrix of,

Is

Represents the right singularity matrix of.

therefore,

Since the exponent for R is high, there is a difference in the ratio of singular values (eg, condition number). Therefore, it can be interpreted that the base station formed a finer beam in the NR-DM-RS. If the terminal uses the optimal linear match vector, higher reception strength may be obtained. Based on this approach, the base station can utilize the method S1 to obtain a narrow beam.

If the base station is difficult to perform digital precoding but analog beamforming is possible, the base station may only transmit the NR-DRS in one step to perform the preprocessing (e.g., method S1). No narrower beams can be formed. In this case, a method (eg, method S2) of transmitting the NR-DRS in two steps may be applied.

In a first step belonging to method S2, the base station allocates DL NR-DRS resources for each virtual sector, and the terminal estimates the index i of the virtual sector to which the terminal belongs using the DL NR-DRS. This is the same as the method S1.

The second step belonging to the method S2 is performed when there is feedback from the terminal. The base station preprocesses a separate DL NR-DRS for each narrow beam to form a narrower beam in the virtual sector (index i) selected by the terminal. The terminal receives the DL NR-DRS represented through each narrow beam, and estimates sequence (sequence) information of the DL NR-DRS. In method S1, using the same method as that of the terminal extracting the virtual sector index, the terminal estimates the index j of the narrow beam. In the same way as the terminal feeds back to the base station in the method S1, the terminal may implicitly transmit the index of the narrow beam to the base station. If the analog beamforming is possible at the base station and the digital preprocessing is difficult, the base station may use method S2 to form a narrow beam j applicable to the terminal.

However, in the case of the method S2, as much radio resources are consumed as the number of narrow beams, it is a heavy burden on the base station. If multiple beams are spatial multiplexed (SDM), the coverage of each beam is reduced because power is divided evenly and multiple beams are transmitted. If multiple beams are frequency division multiplexed (FDM), power is divided and multiple beams are transmitted. If multiple beams are time division multiplexed (TDM), a narrow beam area can be secured, but the latency performance may be reduced because the base station should instruct the terminal to measure the narrow beam over a long time. low. If multiple beams are multiplexed through various schemes, a separate radio resource is needed for the base station to configure such multiplex scheme in advance to the terminal.

A method of transmitting an NR-PBCH and an NR-PDCCH by a base station will be described. Specifically, a method for transmitting the NR-PBCH and the NR-PDCCH independently for each virtual sector of the base station (hereinafter, 'method T1') and a method for transmitting the same NR-PBCH and NR-PDCCH for each physical sector of the base station (hereinafter, ' Method T2 ') is explained.

In method T1, resources of the NR-PBCH may be different for each virtual sector of the base station, and resources of the NR-PDCCH may be different.

When the NR-PBCH and the NR-PDCCH are allocated separately for each virtual sector, the base station may use time multiplexing, frequency multiplexing, or spatial multiplexing, and may support different virtual sectors by dividing the search space of the NR-PDCCH. .

For example, the base station may set the NR-subframe / slot offset of the NR-PBCH and the NR-PDCCH equally for each virtual sector. However, the base station may set different NR-subframe / slot offsets of the NR-PBCH for each virtual sector, and different NR-RB (resource block) indexes of the NR-PDCCH for each virtual sector. This independent configuration may be utilized as a means of avoiding interference between NR-PBCHs and interference between NR-PDCCHs of virtual sectors.

In another example, by applying different preprocessing to control channel elements (CCEs) belonging to a UE search space (eg, a user-specific search space) of the NR-PDCCH, the serving base station is assigned to different virtual sectors in the same slot. The scheduling information may be delivered to the located terminals.

The terminal may receive NR-DRS and NR-PBCH from several virtual sectors, and select a virtual sector having a higher reception quality for NR-DRS (or NR-PBCH and NR-DRS).

In method T1-1 for the method T1, the terminal selects only one virtual sector. Method T1-2 for Method T1 allows the terminal to select a plurality of virtual sectors.

If method T1-1 is used, the content indicated by the NR-PBCH is applied to one virtual sector. However, if method T1-2 is used, the content indicated by the NR-PBCH may be applied to each of several virtual sectors. For example, when UL NR-DRS resources are configured through NR-PBCH, if method T1-2 is used, the UE selects several UL NR-DRS resources and uses UL NR-DRS for the selected resources. Can be transmitted separately.

Method T2 sets the NR-PBCH resource and the NR-PDCCH resource to all virtual sectors equally, sets the NR-PBCH resource to all virtual sectors identically, or sets the NR-PDCCH resource to all virtual sectors identically. For example, when the NR-PBCH includes UL NR-DRS resource settings corresponding to each virtual sector, one same NR-PBCH may include several UL NR-DRS resources. For another example, the NR-PBCH may include several NR-PDCCH resources corresponding to each virtual sector. In method T2, in order for one NR-PDCCH to contain configuration information directly proportional to the number of virtual sectors, a large payload of the NR-PBCH is required.

A method of setting UL NR-DRS resources will be described. Specifically, the method R1 corresponds to the case where the location of the UL NR-DRS resource is fixed by the specification. Method R2 corresponds to a case where the location of UL NR-DRS resources can be set.

In the method R1, since the location of the UL NR-DRS resource is fixed according to the specification, the terminal may receive the UL NR-DRS without additional signaling from the base station. Therefore, the base station does not set up the UL NR-DRS resource in any other physical channel including the NR-PBCH. However, since the base station cannot use the union of UL NR-DRS resources as a radio resource, the method R1 is inefficient when the number of terminals is small. And in the aspect that forward compatibility of NR is supported, UL NR-DRS resource needs to be allowed to be set.

In method R2, in order to set the location of the UL NR-DRS resource, the base station must allocate a separate radio resource. In order for the base station to form a narrow beam and transmit data to the terminal, the NR-PBCH may include the location of the UL NR-DRS resource. For example, the base station may set a resource for the UL NR-DRS, include configuration information of the UL NR-DRS resource in a broadcast channel (eg, NR-PBCH), and transmit a broadcast channel. The number of UL NR-DRS resources of the NR-PBCH is one or more, which is equal to the number of virtual sectors utilized by the base station. For example, the base station may set UL NR-DRS resources to the same number as the number of virtual sectors used by the base station. Since the base station can configure the UL NR-DRS resource by transmitting the NR-PBCH, the base station supports forward compatibility.

The NR-PBCH may further include a bit indicating whether system information is transmitted, in addition to configuration information of the UL NR-DRS resource. Between subframes / slots including NR-PBCH, system information may be transmitted using the NR-PDCCH. For example, the base station may include a bit field indicating whether system information is transmitted through a control channel (eg, NR-PDCCH) in the broadcast channel (eg, NR-PBCH). In this case, a time interval corresponding to a period of the NR-PBCH is a window for receiving system information, and the UE observes the corresponding bit field in the NR-PBCH. If the terminal detects a bit indicating that the base station transmits system information, it is assumed that the terminal receives the system information block before receiving the next NR-PBCH, and performs blind decoding on the NR-PDCCH. The UE appropriately updates a DRx timer for this purpose. If the terminal detects a bit indicating that the base station does not transmit system information, the terminal does not need to observe the NR-PDCCH. When the method R2 and the method T1-2 are used together, the NR-PBCH can be transmitted cell-specific with a bit width of the number of virtual sectors. Or if the NR-PBCH is transmitted in virtual sector-specific, transmission of the NR-PBCH is defined by the number of virtual sectors and one NR-PBCH may include one bit. For example, when the base station intends to transmit the NR-PBCH cell-specifically, one broadcast channel having a bit width corresponding to the number of virtual sectors may be generated. For another example, if the base station wants to send the NR-PBCH virtual sector-specific, it may generate multiple NR-PBCHs for multiple virtual sectors.

A method of setting the NR-PDCCH resource will be described.

It can be assumed that the NR-PDCCH is transmitted in every NR-subframe / slot by the base station. Alternatively, the NR-PDCCH may be assumed to be transmitted in every NR-subframe / slot after the base station receives the UL NR-DRS. The time resources occupied by the NR-PDCCH are predefined in the specification, set via the NR-PBCH, signaled via the NR-PDCCH, or transmitted with the NR-PDCCH (physical control format indicator channel). Can be specified via).

The base station may transmit the NR-PDCCH through the appropriate preprocessing to the terminal. The terminal decodes the NR-PDCCH using the NR-DM-RS. Here, the method of setting the frequency resource of the NR-PDCCH includes the method C1 and the method C2. Method C1 corresponds to the case where the location of NR-PDCCH resources is fixed by the specification. Method C2 corresponds to the case where the location of the NR-PDCCH resource can be set. Although method C1 and method C2 relate to a method of defining an NR-PDCCH, information included in the NR-PBCH may be determined according to a specific embodiment of method C2.

In the method C1, since the location of the frequency resource used by the NR-PDCCH is fixed according to the specification, the terminal may receive the NR-PDCCH without additional signaling from the base station. Therefore, the base station does not set the position of the frequency resource used by the NR-PDCCH in any other physical channel including the NR-PBCH. However, the base station cannot assign RBs belonging to the union of NR-PDCCH resources to data transmission. And in terms of supporting forward compatibility of NR, it is necessary to allow NR-PDCCH resources to be set.

For example, when the terminal transmits the UL NR-DRS, the base station may transmit the NR-PDCCH in the frequency resource determined by the standard. The specification specifies a minimum bandwidth so that the base station can operate even if the base station has a narrow system bandwidth. The base station schedules and assigns an NR-PDSCH including the NR-SIB while transmitting the NR-PDCCH.

UEs that have transmitted UL NR-DRS receive the NR-PDCCH and decode the NR-SIB. If the base station establishes an NR-RRC connection to provide the eMBB service or URLLC service through the NR-PDSCH in addition to the NR-SIB to the UE, the NR-PDCCH-eMBB resource is separately configured or the NR-PDCCH- URLLC resources can be set separately. The terminal having received such a setting no longer receives the NR-PDCCH and may receive the NR-PDCCH-eMBB or the NR-PDCCH-URLLC. The base station which has transmitted this configuration no longer transmits the NR-PDCCH to the terminal.

In method C2, in order to set the position of the frequency resource used by the NR-PDCCH, the base station must allocate a separate radio resource. In order for the base station to transmit data to the terminal by forming a narrow beam, the NR-PBCH may include the location of the NR-PDCCH resources. For example, the base station may configure a resource for the NR-PDCCH and include configuration information of the NR-PDCCH resource in the NR-PBCH. The number of NR-PDCCH resources of the NR-PBCH is one or more, and one NR-PDCCH resource corresponds to a virtual sector utilized by the base station. The location of the NR-PDCCH resource includes an RB index or NR-PDCCH bandwidth. That is, the configuration information of the NR-PDCCH resource may include an index of the RB where the NR-PDCCH resource starts and a bandwidth occupied by the NR-PDCCH. The UE receives a frequency resource of the NR-PDCCH from the RBs belonging to the bandwidth occupied by the NR-PDCCH based on the RB index. Since the base station can set the NR-PDCCH resources by transmitting the NR-PBCH, the base station supports future compatibility.

Information that can be included in the NR-PBCH will be described. The NR-PBCH may include UL NR-DRS resource configuration or NR-PDCCH resource configuration.

The UL NR-DRS resource configuration may be expressed in the form of a list. The UL NR-DRS resource configuration list is a set of UL NR-DRS resource indexes. The UL NR-DRS resource index specifies a radio resource of the UL NR-DRS. The time resource of the UL NR-DRS is a position relative to the NR subframe / slot in which the DL NR-DRS is transmitted and may be defined as an NR subframe / slot offset. Alternatively, the index of the NR-subframe / slot for the UL NR-DRS may be expressed as an absolute value. If an absolute NR-subframe / slot index is assigned to the terminal, the base station must also signal a system frame number (NR-SFN) to the terminal.

The frequency resource of the UL NR-DRS may include an RB index or a bandwidth. If the bandwidth for transmitting the UL NR-DRS is predefined in the standard, the UE can know the frequency resource for the UL NR-DRS only by the RB index received from the NR-PBCH.

The NR-PDCCH resource configuration may be expressed in the form of a list. The NR-PDCCH resource configuration list is a set of NR-PDCCH resource indexes. The NR-PDCCH resource index specifies a radio resource of the NR-PDCCH. The time resource of the NR-PDCCH may be previously defined in the specification and follows the above-described method. The frequency resource of the NR-PDCCH follows the above-described setting method. The base station delivers an OFDM symbol index set and a PRB index set in which an NR-PDCCH candidate exists, which is called a control resource set. The terminal may monitor one or more sets of control resources. The number of NR-DM-RS antenna ports required for decoding the NR-PDCCH may be explicitly included in the NR-PDCCH resource configuration, or may be implicitly included in the NR-PBCH. For example, the number of NR-DM-RS antenna ports may be included in the NR-PBCH through a cyclic redundancy check (CRC) mask of the NR-PBCH, and the terminal performs a blind test to perform the blind test. Know the RS antenna port.

The serving base station regards the NR-PBCH and the synchronization signal (e.g., PSS, SSS) as one unit (e.g., synchronization signal burst) belonging to the same virtual sector, and thus the NR-PBCH and the synchronization signal (e.g., PSS, SSS). Apply the same pretreatment. That is, a synchronization signal (SS) burst includes an NR-PBCH and a synchronization signal (eg, PSS, SSS). The number of SS bursts is determined and transmitted according to the number of beams or preprocesses transmitted by the serving base station. Although the terminal does not know the number of SS bursts, the terminal may perform cell search and initial access. Since the UE has a less time delay while increasing the reception quality of the NR-PBCH while performing the cell search procedure, the UE can combine not only one SS burst but also NR-PBCHs belonging to several SS bursts. have.

The serving base station may transmit the same redundancy version (RV) of the NR-PBCH in different SS bursts when the SS bursts are successively transmitted several times in order to assist in the reception combining of the UE. (Hereinafter 'Method PBCH-rv-1'). Alternatively, the serving base station may transmit different encoded versions (RVs) of the NR-PBCH in different SS bursts (hereinafter, 'method PBCH-rv-2').

Method PBCH-rv-1 is a method in which all PBCHs transmitted in the SS burst set have the same encoded version (RV). That is, NR-PBCHs belonging to SS bursts transmitted by the base station may have the same RV. The UE synthesizes PBCHs that have undergone different preprocessing but have the same encoded version (RV). The serving base station may include Z SS bursts in the SS burst set. The transmission period of the PBCH is T ₁ , and all RVs of the PBCH are transmitted once every T. In this case, the Z PBCHs belonging to the SS burst set have the same RV with each other. Terminal is assumed to not know the value of Z in advance, is detected, the PBCH of success Z ₁ items (where, Z ₁ ≤Z) said to have a RV of all decode the PBCH. Through this process, the UE can achieve less delay time than the method of synthesizing each of the Z PBCHs by separating the PBCHs having the same preprocessing from each other.

According to a radio channel experienced by the terminal, the terminal may receive a relatively weak or relatively strong PBCH to which a specific preprocessing is applied. Therefore, when the method PBCH-rv-1 is used, the relatively weakly received RV does not greatly help the synthesis process of the terminal. Rather, when a relatively weakly received PBCH has a RV different from that of a relatively strongly received PBCH, the UE may use more parity bits in the synthesis process, and thus, reception quality may be improved. have.

Method PBCH-rv-2 is a method in which PBCHs transmitted in an SS burst set have different RVs. That is, NR-PBCHs belonging to SS bursts transmitted by the base station may have different RVs. The UEs combine different PBCHs that have undergone different preprocessing and have different RVs. The serving base station may include Z SS bursts in the SS burst set. The transmission period of the PBCH is T ₁ . In the case where all RVs of the PBCH are transmitted once in a period of T, the Z PBCHs belonging to the SS burst set may have different RVs. Terminal do not know the value of Z in advance, on the assumption that the detection success of the PBCH Z ₁ items (where, Z ₁ ≤Z) may have a different RV, decodes PBCH. The UE indirectly recognizes the value of RV of each PBCH while receiving the PBCH. For example, the serving base station may use scrambling resources or CRC masking for the PBCH differently depending on the RV. That is, different scrambling resources (or CRC masks) may be applied to NR-PBCHs belonging to SS bursts transmitted by the base station. In this case, the UE may demodulate (eg, blind demodulation) randomly such scrambling and calculate an RV based on these results. The serving base station optimizes the combination of RVs so that the UE can decode even if the UE receives PBCHs corresponding to different RVs.

While the serving base station transmits four SS bursts (eg, Z = 4), the PBCHs may be encoded and mapped to each SS burst as 0, 1, 2, and 3, which are RV values. For example, assuming that the value of RV that SS burst 1 has during T is 0, 2, 1, 3, the value of RV that SS burst 2 has during T is 2, 1, 3, 0 and SS burst 3 is T The serving base station has four SS bursts (SS bursts 1, 2, 3, and 1) so that the values of RV during the time period are 1, 3, 0, 2 and SS burst 4 has the

values

3, 0, 2, and 1 during the T burst. 4) can be transmitted. The UE detects the PBCH of Z ₁ items (where, Z ₁ ≤4) in the SS sets the burst, and synthesis and decoding the PBCH, after detection of a value of each RV PBCH having, based on this. Since the UE receives different RVs having different qualities, it is possible to obtain a preprocessing multiplexing gain in the PBCH.

If the serving base station transmits two SS bursts (eg, Z = 2), the value of RV has 0 and 2 as one RV combination, 1 and 3 as one RV combination, and the time of transmission of the SS burst. Each RV combination can be applied. Since RV 0 has most of the information bits and RV 3 has most of the parity bits, the UE can include RV 0 and RV 3 in one SS burst set. Since RV 1 and RV 2 have an adequate mix of information and parity bits, they can be included in one set of SS bursts. For example, the serving base station assumes that the value of RV that SS burst 1 has during T is 0, 1, 2, 3, and assumes that the value of RV that SS burst 2 has during T is 2, 3, 0, 1. . Here, when the order of the RVs follows the gray mapping, RVs having many parity bits are transmitted in succession, and RVs having fewer parity bits are transmitted in succession. Therefore, the order of the RVs may be defined in the TS so that the combination of the RV having a lot of parity bits and the RV having few parity bits are alternately transmitted. The UE receives the PBCH while alternating the value of the RV to an odd number and an even number, and may synthesize and decode the PBCH based on this. Since the UE receives different RVs having different qualities, it is possible to obtain a preprocessing multiplexing gain in the PBCH.

The NR-SIB transmission method for the case where the method C1 and the method C2 are used will be described. Method C1 corresponds to the case where the location of the NR-PDCCH resource is defined by the standard. Method C2 corresponds to the case where the location of the NR-PDCCH resource is allowed to be set. The NR-SIB transmission method for the method C2 will be described by dividing the method C2-1 and the method C2-2 according to the NR-PBCH transmission method. In addition, the NR using both the method C1 and the method R2 does not need to transmit the NR-PBCH.

The NR-SIB transmission method when the method C1 is used will be described. The base station periodically transmits the DL NR-DRS. The base station periodically transmits the NR-PBCH using the DL NR-DRS antenna port. If method T1 is used, the base station transmits a separate DL NR-PBCH for each virtual sector. When method T2 is used, the base station transmits the same DL NR-PBCH without distinguishing the virtual sector (s). The preprocessing of the DL NR-DRS antenna port is not defined in the specification and is implemented by the base station. The base station may preprocess the DL NR-DRS resource, similarly to the virtual sector. The base station may transmit DL NR-DRS resources in the same manner as the number of virtual sectors.

The UE may receive the DL NR-DRS even if the UE does not receive the configuration information of the DL NR-DRS in advance. Although the UE does not receive the number of DL NR-DRS resources in advance, the UE performs cell detection through blind detection. When the terminal successfully receives a specific DL NR-DRS, the terminal demodulates the NR-PBCH using the received DL NR-DRS antenna port. When the method R2 is used, the NR-PBCH includes setting information of the UL NR-DRS. Since the terminal estimates the index i of the virtual sector to which the terminal belongs from the received DL NR-DRS resources, the terminal selects the i-th UL NR-DRS resource and transmits the UL NR-DRS using the selected resource. The preprocessing of the terminal should be applied to the UL NR-DRS, but the preprocessing of the terminal is not defined by the standard and is performed by the implementation of the terminal. The terminal may apply the UL NR-DRS by reusing a linear filter for receiving the DL NR-DRS.

When the base station receives the UL NR-DRS from the terminal, it can implicitly know the index i of the virtual sector to which the terminal belongs. The base station starts to transmit the NR-PDCCH corresponding to the i-th virtual sector. When the method T1 is used, the base station transmits a separate NR-PDCCH for each virtual sector. When the method T2 is used, the base station transmits the same NR-PDCCH without distinguishing the virtual sector (s). The NR-PDCCH is transmitted by the base station based on the NR-DM-RS antenna port. The NR-DM-RS resource is transmitted through preprocessing, and the preprocessing method used at this time may be implemented by implementation. The base station can reuse the linear filter used to demodulate the UL NR-DRS received from the terminal. Since the NR-PDCCH is transmitted at a resource location predefined by the standard, the UE does not receive resource information of a separate NR-PDCCH. The terminal detects a DL scheduling assignment on the NR-PDCCH. The terminal detects allocation information of the NR-PDSCH from the detected DL scheduling allocation information. Since the NR-SIB is included in the NR-PDSCH, the UE can decode the NR-SIB. Information included in the NR-SIB may recognize SFN, system bandwidth, physical layer cell identification information, and the like. In addition, scheduling information for receiving system information for establishing an NR-RRC connection may be received by the terminal.

The NR-SIB transmission method when the method C2-1 is used will be described.

The base station periodically transmits the DL NR-DRS. The base station periodically transmits NR-MIB type 1 over the NR-PBCH using the DL NR-DRS antenna port. The NR-PBCH transmission method uses the same method as the NR-PBCH method described in Method C1. When the method T1 is used, the base station transmits a separate DL NR-PBCH for each virtual sector. If method T2 is used, the base station transmits the same DL NR-PBCH without distinguishing the virtual sector (s). When the method R2 is used, the NR-MIB type 1 included in the DL NR-PBCH includes configuration information of the UL NR-DRS resource. When the terminal selects a specific resource and transmits the UL NR-DRS, the base station starts the transmission of the NR-PBCH, followed by the transmission of the NR-PDCCH. When the method T1 is used, the base station transmits a separate NR-PBCH and a separate NR-PDCCH for each virtual sector. When method T2 is used, the base station transmits the same NR-PBCH and the same NR-PDCCH without distinguishing the virtual sector (s). The base station transmits the NR-PBCH using the NR-DRS antenna port, and uses a resource distinguished from the NR-PDCCH based on the DL NR-DM-RS antenna port. The preprocessing method determined by the base station is applied to the NR-DM-RS and the NR-DRS. When method C2 is used, the information contained in the NR-PBCH is NR-MIB type 2. NR-MIB type 2 includes configuration information of NR-PDCCH resources. NR-MIB type 2 explicitly or implicitly includes the location of the NR-subframe / slot to which the NR-SIB is delivered. For example, the NR-MIB type 2 includes SFN information, and the terminal may estimate the NR-subframe / slot in which the NR-SIB is received. The NR-PDSCH, including the NR-SIB, has a period defined by the specification.

The terminal decodes the NR-PDCCH using the NR-DM-RS antenna port and detects scheduling allocation information for the NR-PDSCH. The terminal decodes the NR-PDSCH to obtain an NR-SIB. The NR-SIB includes direct and indirect information for establishing an NR-RRC connection. As in LTE, the NR-SIB may be set to have different periods according to its contents. The method C2-1 may be modified and applied to an NR-SIB transmission scheme of NR (eg, 6 GHz or less) operating in a low frequency band. That is, in the above-described NR-SIB transmission scheme (eg, procedures for 6 GHz or more), transmission of NR-MIB type 1 and transmission of UL NR-DRS may be excluded. That is, NR-SIB procedures similar to each other in terms of band agnostic may be used.

The NR-SIB transmission method when the method C2-2 is used will be described.

The base station periodically transmits the DL NR-DRS. The base station periodically transmits the NR-MIB through the NR-PBCH using the DL NR-DRS antenna port. The NR-PBCH transmission method uses the same method as the NR-PBCH method described in Method C1. When the method T1 is used, the base station transmits a separate DL NR-PBCH for each virtual sector. If method T2 is used, the base station transmits the same DL NR-PBCH without distinguishing the virtual sector (s). The NR-MIB includes configuration information of the NR-PDCCH resource. When the method R2 is used, the NR-MIB further includes configuration information of the UL NR-DRS resource, and includes both configuration information of the NR-PDCCH resource and configuration information of the UL NR-DRS resource. Although the amount of information that the NR-MIB has in the method C2-2 is greater than that in the method C1 or the method C2-1, the UE may establish the NR-RRC connection faster.

The terminal receives the DL NR-DRS and selects a virtual sector i corresponding to one NR-DRS resource. The terminal transmits the UL NR-DRS using the i-th UL NR-DRS resource.

The base station recognizes the existence of the terminal using the UL NR-DRS received from the terminal, and starts transmitting the NR-PDCCH. When the method T1 is used, the base station transmits a separate NR-PBCH and a separate NR-PDCCH for each virtual sector. When method T2 is used, the base station transmits the same NR-PBCH and the same NR-PDCCH without distinguishing the virtual sector (s). The base station transmits the NR-PDCCH through an implementational preprocessing using the NR-DM-RS antenna port.

The terminal decodes the NR-PDCCH from the DL NR-subframe / slot after transmitting the UL NR-DRS.

The base station may transmit the NR-SIB to the terminal using the NR-PDSCH. The NR-SIB includes not only SFN, system bandwidth, etc., but also direct and indirect information for establishing an NR-RRC connection.

Hereinafter, the operation of an idle terminal will be described.

The idle terminal may receive the NR-PDCCH using the NR-MIB.

If the base station does not transmit the NR-PDSCH when the base station does not receive the UL NR-DRS, the idle terminal may not receive the NR-SIB transmitted by the base station using the NR-PDSCH. Since the NR-SIB includes at least cell selection / reselection, public land mobile network (PLMN) identification list and cell barring information, the idle terminal is assigned to the corresponding NR cell. It is not possible to determine whether or not an association can be made. Therefore, the idle terminal should transmit the UL NR-DRS to induce the base station to transmit the NR-SIB in the NR-PDCCH and NR-PDSCH. However, when the idle terminal transmits the UL NR-DRS, power consumption is directly proportional to the number of NR-cells observed. As a method for reducing this, the UE may observe whether NR-SIB transmission (eg, NR-SIB transmission to be applied for each virtual sector) included in the above-described NR-PBCH. Through this, even if only one terminal among other terminals belonging to the same virtual sector as the idle terminal transmits the UL NR-DRS, the base station can adjust the bit field of the NR-PBCH.

When the base station predicts the NR-SIB transmission through the NR-PBCH, the terminal that wants to receive the NR-SIB among the terminals belonging to the corresponding virtual sector, in the consecutive downlink subframe / slot (s) after the NR-PBCH Observe the NR-PDCCH. The monitoring window for the idle terminal may use a subframe / slot window defined by the standard. Alternatively, the UE may observe the NR-PDCCH in all subframes / slot (s) allowed by discontinuous reception (DRx) until the next NR-PBCH is received.

Hereinafter, the RRM measurement performed by the terminals will be described.

4 is a diagram illustrating a scenario regarding RRM measurement performed by a terminal according to an embodiment of the present invention. 5 is a diagram illustrating RE mapping of DL NR-DRS resources according to an embodiment of the present invention.

There are a plurality of base stations and terminals. One base station has a plurality of cells, and each cell is deployed at a different frequency (eg, F ₁ , F ₂ ). 4, four cells are illustrated. The UE performs RRM measurement for four cells.

The UE does not perform RRM measurement in every subframe / slot. The TS defines the period and subframe / slot offset of the fixed DL resource including the DL NR-DRS resource transmitted by the base station. The UE may know from a known period and a subframe / slot offset whether a specific subframe / slot includes a DL NR-DRS resource or not. The UE can know the subframe / slot including the DL NR-DRS resource through the configuration of the base station or the reception of the physical layer signal, and performs RRM measurement only in the corresponding subframe / slot.

The fixed DL resource may be composed of adjacent resource elements (REs) that may be represented by localized time and localized frequency. Alternatively, the fixed DL resource may be composed of non-contiguous REs to obtain diversity.

The DL NR-DRS resource is a subset of the fixed DL resource, and is composed of REs distributed apart from each other to obtain diversity. Such DL NR-DRS resources may be distributed in various forms in fixed DL resources. DL NR-DRS resource means all DL NR-DRS antenna ports transmitted by the serving base station, and may be configured with one or more.

FIG. 5A illustrates uniform allocation for DL NR-DRS RE, and FIG. 5B illustrates equi-distance allocation for DL NR-DRS RE. have.

As illustrated in (a) of FIG. 5, the RE mapping of DL NR-DRS resources may use the same subcarrier while using multiple symbols within a fixed DL resource.

Alternatively, as illustrated in FIG. 5B, the RE mapping of the DL NR-DRS resource may use several symbols and several subcarriers within a fixed DL resource.

As illustrated in (a) of FIG. 5, in case the RE mapping for DL NR-DRS uses the same subcarrier and adjacent symbols, if spreading codes are used in the time domain, different DL NR− DRS antenna ports or DL NR-DRS antenna ports from different serving base stations may be multiplexed. Since the received power gain can be obtained through this, FIG. 5A can be used for DL coverage expansion.

As illustrated in FIG. 5B, when RE mapping for DL NR-DRS is performed such that subcarriers maintain a constant distance per symbol within a fixed DL resource, the RE mapping for DL NR-DRS is timed. It has lower channel estimation error in the domain and frequency domain. When the terminal demodulates a physical channel belonging to a fixed DL resource, a predetermined interpolation method for performing channel estimation on an arbitrary RE can be easily used. If the UE demodulates a PBCH using DL NR-DRS, an RE mapping having a form similar to the RE mapping illustrated in FIG. 5B may be performed.

Meanwhile, the fixed DL resource means a physical signal and a physical channel transmitted regardless of the subframe / slot type. The fixed DL resource includes at least a DL NR-DRS, a synchronization signal, and an NR-MIB (master information block). When a physical signal and a physical channel are not transmitted periodically or intermittently (eg, on-demand or event-driven), they may not be included in the fixed DL resource. The amount of these aperiodic physical signals and physical channels is proportional to the DL load. For example, DL scheduling assignment among UE-specific beamformed PDCCHs (eg, UE-specific beamformed PDCCHs) and UE-specific beamformed EPDCCHs (eg, UE-specific beamformed EPDCCHs). The control channel associated with is included in the fixed DL resource. For another example, the fixed DL resource includes a UE specific PDSCH (eg, UE-specific PDSCH). For another example, when a system information block (SIB) is transmitted through a PDSCH, a common search space (CSS) of the SIB and a PDCCH scheduling the same is included in the fixed DL resource. In another example, a paging channel is included in the fixed DL resource. In another example, a physical multicast channel (PMCH) is included in a fixed DL resource. The classification method of the physical signal and the physical channel may be used regardless of the number of symbols constituting the TTI or irrespective of the numerology.

Since the 3GPP NR TDD reference system 1 can change the subframe / slot type for each subframe / slot, the UE cannot know the existence of the GP in advance and the GP position in the subframe / slot in advance. As a way for the UE to know the presence of the GP, the UE decodes the NR-PDCCH in the corresponding subframe / slot and receives the DL assignment, thereby making the subframe / slot a DL subframe / slot or DL-centric ( centric) subframe / slot. The latter case corresponds to the case where a GP is defined in a DL-centric subframe / slot. Alternatively, the terminal may receive a UL grant and determine that the corresponding subframe / slot is a UL subframe / slot or a UL-centric subframe / slot. Alternatively, the terminal receives the UL grant and receives a starting symbol index or ending symbol index of the UL data region, so that the GP exists in the corresponding subframe / slot and that the GP The location can be determined indirectly.

If the UE does not receive the DL assignment and the UL grant in the corresponding subframe / slot, it is difficult to know the subframe / slot type of the serving cell. In the case of a wireless communication system operating with TDD, the subframe / slot type is a DL subframe / slot, a DL-centric subframe / slot, an UL subframe / slot, a UL-centric subframe / Slot, and one of a special subframe / slot. If the subframe / slot type corresponds to a special subframe / slot, the UE can know the number of symbols belonging to the DL region.

In this case, method IND1 and method IND2 can be considered.

In method IND1, the serving cell includes a subframe / slot type indicator (STI) indicating the subframe / slot type in the fixed DL resource. Methods IND1-1, Method IND1-2, and Method IND1-3 for Method IND1 can be considered.

Method IND1-1 corresponds to a case where a physical subframe / slot type indicator channel (PSTICH) including an STI is separately defined by the TS. Method IND1-1 may explicitly inform the UE of a cell-specific type. For this purpose, an RE should be additionally used, but despite this overhead, the UE can easily know the corresponding subframe / slot type. In particular, the terminal performing inter-frequency RRM measurement, whether the subframe / slot is a DL subframe / slot (eg, the UL region does not exist) only in STI in a fixed DL resource, DL-centric (centric This DL, since it can be seen whether it is a subframe / slot, a UL subframe / slot (e.g., no DL region exists), a UL-centric subframe / slot, or a special subframe / slot. Regions can be used for RRM measurements. In this case, the STI must convey the number of five cases. However, if the STI is defined to simply change the algorithm that performs the RRM measurement, it is sufficient that the STI carries only two cases. Here, the number of two cases is that a minimum resource over a symbol and frequency domain (eg, a symbol and frequency domain predefined by the TS or preset by the base station) for the UE is a DL region of a subframe / slot. It can mean whether it is included in (region) or not. In this case, the STI can carry only 1 bit.

Alternatively, the length of the DL region in the STI can be encoded. The number of symbols additionally allocated as DL regions after the fixed DL resource may be defined by the TS in some cases. For example, the STI can convey the number of four cases, the first case can show zero, the second case can show four, the third case can show eight, In the fourth case, 12 can be displayed. The STI may signal the number of DL symbols to unspecified terminals by using 2 bits.

The STI may deliver slot types subdivided into three or more cases to the UEs. In this case, the UE may not only support RRM measurement or CSI feedback that requires recognition of the DL region, but also support a scenario in which the UE needs to recognize the UL region. For example, the operation of the terminal configured from the serving base station to measure the UL interference signal from the neighbor base station may be considered. When the serving base station operates in dynamic TDD, the serving base station may configure the terminal to perform measurements on DL interference signals and UL interference signals from neighboring base stations, respectively. Here, the measurement may mean a CSI measurement, an RRM measurement, or a CSI and RRM measurement. In this case, the UE needs to know information about the UL region as well as the DL region of the neighbor base station, which can be obtained from the STI included in the PSTICH transmitted by the neighbor base station.

The PSTICH can use multiple REs within a fixed DL resource to obtain frequency diversity through encoding.

PSTICH belongs to a fixed DL resource in which DL NR-DRS resources are defined. In subframes / slots in which DL NR-DRS resources are not transmitted, STIs for RRM measurement need not be transmitted. However, if the processing time is required to be very short, it is advantageous for the UE to know the subframe / slot type or STI at a very early time, and also to know the subframe / slot type or STI of the adjacent cell. In this case, the PSTICH may be transmitted every subframe / slot. If the base station transmits a PSTICH every subframe / slot, the PSTICH will include at least the subframe / slot type, as well as the time and frequency location of the blank resource, and the number of symbols with the DL control channel. Can be. Here, the blank resource may have a unit of a subband and a mini-slot.

The time location and frequency location of the PSTICH resource are defined by the TS, and UEs (eg, RRC_IDLE UEs) and non-serving UEs that are not RRC-connected to the base station may also measure the location. Can be done.

The PSTICH is transmitted through a single antenna port, and the terminal should be able to receive the PSTICH using a cell-specific antenna port. In the NR cell, a separate DM-RS for PSTICH may be introduced. Alternatively, the NR cell may modulate the PSTICH using an antenna port for CSS (common search space) of the PDCCH. The PSTICH and the PDCCH do not use different DM-RSs, and the UE can reuse the DM-RS for the PDCCH to demodulate the PSTICH. On the other hand, when the DM-RS for PSTICH demodulation and the DM-RS for PDCCH demodulation are separated from each other and use different antenna ports, the serving base station needs to transmit more DM-RS, which is disadvantageous in terms of resource efficiency. Do.

The PSTICH should be able to be detected by a terminal in an RRC idle state or an RRC connected terminal belonging to an adjacent base station. Therefore, in order for the terminal not connected to the serving base station or the terminal belonging to the neighboring base station to detect the PSTICH, the serving base station is larger than the amount of DM-RS transmitted only for the serving terminal in the RRC connected state. DM-RS may be included in the PSTICH and transmitted. Therefore, in order to minimize additional transmission of the PSTICH DM-RS, the same preprocessing as the preprocessing for the PDCCH DM-RS transmitting a common search space (CSS) may be applied to the PSTICH. In this case, the serving base station may transmit using the PSTICH and the PDCCH in the same frequency band or alternately interleaved frequency resources (for example, the PSTICH uses an odd REG index and the PDCCH uses an even REG index). In this case, the UE may assume that the CSS of the PSTICH and the CSS of the PDCCH use the same antenna port.

In the case of the PSTICH, additional DM-RSs may be transmitted or a lower coding rate may be applied to the subframe / slot type indicator (STI) in order for the terminals to have a higher reception quality (eg, a lower error rate). In order to apply a lower coding rate to the STI, the coded STI can be mapped to a greater amount of time and frequency resources. Since the STI should be utilized at an early point in the subframe / slot, the serving base station can use a larger amount of frequency instead of increasing the latency for demodulation of the UE by using a smaller amount of time. . Through this, frequency multiplexing gain can also be obtained.

The PSTICH may be allowed to have different values for each virtual sector. In this case, the PSTICH may be transmitted separately for each virtual sector. If the PSTICH is transmitted cell-specifically, all of the slot types that should be present for each virtual sector may be included in the cell-specific PSTICH.

Method IND1-2 corresponds to a case where the PSTICH is included in the NR-PDCCH. For example, the base station may generate an STI indicating the type of subframe / slot, include the STI in the NR-PDCCH, and transmit the NR-PDCCH to the terminal through the fixed DL resource. The terminal finds a subframe / slot type indicator (STI) in the common search space or cell-specific search space (CSS) of the NR-PDCCH. In this case, since the UE needs to search for a separate PDCCH candidate, the UE must perform PDCCH demodulation in order to perform RRM measurement. For this purpose, since the terminal operates more complicatedly, the method IND1-2 is disadvantageous than the method IND1-1. The meaning of the STI and the method of setting the DM-RS in the method IND1-2 are the same as those in the method IND1-1.

In order to reduce the complexity of the terminal, the terminal should be able to recognize the location of the time and frequency resources of the STI without randomly (eg blind decoding) the search space of the PDCCH. To this end, a separate scrambling operation for the REG (or CCE) including the STI may not be performed among the REGs (or CCEs) belonging to the PDCCH.

For example, a REG (or CCE) may be separately allocated as a part of a PDCCH, and the REG (or CCE) may include at least information of an STI, and in addition, the REG (or CCE) may be a blank resource. ), Or may include additional information such as reserved resources. That is, the base station may transmit the STI by using the REG (or CCE) corresponding to the identification information of the base station among the REGs (or CCEs) belonging to the fixed DL resource (or PDCCH resource). The terminal may infer the frequency and time resources of some resources of the PDCCH according to identification information of the serving base station (or serving cell). Since the resources for transmitting the STI may vary according to identification information of the serving base station (or serving cell), the STIs transmitted by different base stations (or cells) may avoid collision.

Accordingly, the terminal may recognize the STI of the serving base station or the STI of the neighboring base station and perform an operation such as RRM measurement or CSI measurement as set by the serving base station.

Since the method of transmitting the STI as part of the PDCCH uses REG or CCE, the serving base station avoids REG (or CCE) for STI transmission and performs REG mapping (or CCE mapping) for another PDCCH candidate. do. For example, the serving base station performs mapping for CCE configuration using remaining REGs other than the REG for STI transmission among REGs, and then maps PDCCH candidates to the already generated CCE. That is, the serving base station may map PDCCH candidates to remaining REGs other than the REG for STI transmission among REGs belonging to the fixed DL resource. Therefore, when the serving base station performs indexing or numbering of the REG constituting the CCE, the serving base station performs indexing using only the REGs to which the STI is not mapped and configures the CCE. For another example, the serving base station may perform indexing using only the remaining CCEs except for the CCE for STI transmission among the CCEs. Thereafter, the serving base station performs mapping for the PDCCH candidate.

An example of the PSTICH design will be described.

The method of defining the PSTICH may use the method STI-1 as in the LTE PCFICH, or may use the method STI-2 as in the LTE PDCCH.

In method STI-1, the PSTICH is designed similar to the LTE PCFICH. The serving base station processes the encoded STI in REG units (or CCE units), and encodes the resource into a resource that can be inferred from the identification information of the serving base station (or serving cell) or at the REG (or CCE) location defined by the TS. Mapped STIs in REG units (or CCE units).

In order for the UE to demodulate the STI earlier, the REG or CCE including the STI may be located in the first DL symbol. For example, the base station may locate the REG (or CCE) for STI transmission in the time domain symbol that is the one of the time domain symbols belonging to the subframe / slot.

In order to increase the decoding performance of the STI, the serving base station may map REGs or CCEs including the STI over several frequencies. For example, the serving base station may map REGs (or CCEs) for STI transmission to multiple frequencies belonging to the system bandwidth. Through this, a frequency diversity gain can be obtained.

In method STI-2, the PSTICH is included in a cell-specific search space of the PDCCH.

The PSTICH includes at least information for knowing the number of DL symbols. For example, the serving base station configures one subframe / slot with x symbols (where x = 7 or 14), and y DL symbols (y <x) in one subframe / slot. If present, the serving base station should inform the terminal of the value of y. For example, the serving base station determines the number y of time domain symbols for the DL among the x time domain symbols belonging to the subframe / slot, determines the type of the subframe / slot, and determines the determined number y And a PSTICH including the determined subframe / slot type (or STI) may be transmitted through CSS for the PDCCH. Here, y and STI may be encoded and included in the PSTICH in an index form.

The UE may interpret the (x-y) symbols as GP or UL symbols. The terminal may recognize that the corresponding symbol is a UL symbol or a GP symbol by receiving the PSTICH. The UE performs reception and transmission according to the DL assignment and the UL grant of the base station, and may use y symbols for DL measurement (eg, RRM measurement, CSI measurement, etc.).

Not only the terminal in the RRC connected state belonging to the serving base station (or serving cell), but also the terminal performing inter-frequency measurement, or the terminal in the RRC idle state, may decode the PSTICH. Through this, the terminal can know the value of y. For example, the terminal may measure an appropriate RSSI for the serving base station (or serving cell) using the y value.

In order for the UE to demodulate the STI earlier, the REG (s) or CCE (s) including the STI may be located in the first DL symbol. For example, the base station may place one or more REGs (or CCEs) for STI transmission among the REGs (or CCEs) belonging to the PDCCH resource in the symbol that is the one of the y DL symbols.

In order to increase the decoding performance of the STI, the serving base station may map REGs or CCEs including the STI over several frequencies. For example, the serving base station may map one or more REGs (or CCEs) for STI transmission among REGs (or CCEs) belonging to a PDCCH resource, to a plurality of frequencies within a system bandwidth. Through this, a frequency diversity gain can be obtained.

The serving base station processes the encoded STIs in CCE units (or REG units), maps the STIs encoded in CREG units (or REG units) to the REG location (or CCE location) defined by the TS, or serves the serving base station (or The encoded STI is mapped to a CCE unit (or REG unit) to a resource that can be inferred from the identification information of the serving cell). For example, the terminal may infer the location of system information (eg, SIB) belonging to the SS burst from identification information of the serving base station (or serving cell), and may know the location of the STI by demodulating the SIB. As another example, the STI may be mapped to a resource that is determined based on identification information of the serving base station (or serving cell). For another example, the STI may be sent in the resource determined by the TS.

Method IND1-3 may increase the reception strength of the DL NR-DRS antenna port by a spreading factor using code division multiplexing (CDM) in the DL NR-DRS resource. For example, LTE CSI-RS or LTE DM-RS may increase the reception strength of the terminal using CDM-2 and CDM-4. Each orthogonal cover code (OCC) applied to the CDM corresponds to one antenna port.

If the subframe / slot type of the DL NR-DRS subframe / slot is a DL-centric subframe / slot, a specific OCC (eg, OCC ₁ ) is applied to each DL NR-DRS resource. DL-NR DRS sub-frame / slot type of the sub-frame / slot is centered UL- (centric) when the sub-frame / slot, and the OCC (for example, ₁ OCC and OCC different ₂₎ different in DL-NR DRS resources applicable . Since the UE can estimate the OCC applied to the DL NR-DRS resource, the UE can know the subframe / slot type of the corresponding DL NR-DRS subframe / slot. This is a method in which 3GPP NR cells perform implicit indication through DL NR-DRS resources without defining a separate physical channel.

In detail, when a DL NR-DRS resource composed of several (eg, L) DL NR-DRS REs is defined by a TS, an NR cell may use an L-length OCC. The subframe / slot type may be determined according to the OCC detected by the terminal. For example, when L = 2, the UE detects [+1, +1] to determine that the subframe / slot type is a DL-centric subframe / slot. For another example, the UE detects [+1, -1] to determine that the subframe / slot type is a UL-centric subframe / slot.

Method IND2 is a method in which the UE recognizes a subframe / slot type without additional indication.

In method IND2-1 for method IND2, the UE may infer the subframe / slot type according to the characteristics of the subframe / slot type for 3GPP NR TDD.

If the subframe / slot type is a DL-centric subframe / slot, the GP is not defined or the GP position contains the last symbol of the subframe / slot. If the subframe / slot type is a UL-centric subframe / slot, the symbol located next to the fixed DL resource and the next symbol (s) belong to the GP. If the subframe / slot type is a special subframe / slot, a non-zero number of DL symbols are located after the fixed DL resource, after which a GP is located, followed by a UL region. ) Is located. Accordingly, the UE can determine the subframe / slot type by detecting the position of the GP. The method for detecting the position of the GP may use a method in which the terminal performs energy detection.

Since 3GPP NR TDD requires that geographically adjacent base stations operate in time synchronization, the UE assumes that there is no DL data transmission according to scheduling assignment or UL data transmission according to scheduling grant in a resource belonging to GP. can do. In the resource belonging to the GP, relatively less energy is received than the DL region or the UL region. Therefore, the terminal detects the position of the GP by performing energy detection for each symbol.

Assuming that the energy value detected by the UE in the next symbol of the symbol including the fixed DL resource is E ₁ , the energy value detected by the UE by repeating this process is [E ₁ , E ₂ , ..., E _L ]. Here, L is a natural number and corresponds to a symbol index belonging to a subframe / slot and not including a fixed DL resource.

In order to detect the presence of a GP of unknown length, the terminal

You can compare the values of and E _L. If the region containing the symbol is a DL region, since the interference hypothesis is the same, the value of S _L corresponding to the partial average does not differ significantly from E _L. . If the region containing the symbol differs from the region corresponding to the partial average, the value of S _L is E _L. Can make a big difference. According to the result of such change detection in one symbol, the terminal may detect the presence of the GP.

In order to reduce false alarm probability, the terminal may perform hypothesis testing using a larger number of symbols. The UE may divide (or group) the symbols into GP and UL regions in a UL-centric subframe / slot. The UE may divide (or group) symbols into DL regions or group (or group) DL regions in a DL-centric subframe / slot. [E ₁ , E ₂ , ..., E _M ] can be divided into two groups or less. Here, M represents the maximum value of L. The boundary when [E ₁ , E ₂ , ..., E _M ] is divided into two groups corresponds to one. If the UE utilizes all of the (M + 1) values after storing all one subframe / slot in the data buffer, a latency as long as the length of the subframe / slot occurs. However, since only energy values are stored (that is, (M + 1) values are stored), the amount of data is not large. In addition, when the detection of the GP position is utilized for the RRM measurement, the latency as long as the length of the subframe / slot is negligibly small.

However, there are several scenarios in which the index of the GP symbol cannot be detected correctly. For example, there is a case where the direction in which the terminal to detect the subframe / slot type is located is nulled by preprocessing selected by the cell scheduler. In this case, even if the terminal is assumed to be located in the cell center, even if non-trivial energy is radiated in the DL region and the terminal receives it, the terminal is small. It is possible to collect energy. For another example, there is a case where a terminal for detecting a subframe / slot type is located at a cell edge. In this case, due to path loss, the received energy level may not be significantly different from the noise level. In this case, the terminal may misdetect the GP. Another example is when there is less DL data in the data buffer. In this case, since the scheduler does not radiate energy even when the terminal is located in the cell center, the terminal cannot collect much energy. In this case, it is difficult for the terminal to detect the presence of the GP. If there is no predetermined large difference (eg, offset greater than threshold) in sufficient statistics obtained from hypothesis testing, the terminal may not determine the presence of a GP, and the terminal may not determine the corresponding subframe. It is not possible to determine the subframe / slot type of the slot.

The cell association may reduce the control plane latency based on the load condition. A case where a base station operates several system carriers with several frequency allocations is considered. This corresponds to a case where cells having different frequencies are operated at the same site.

The UE performs RRM measurement for each cell. When the terminal measures the RSRP for each cell without additional setting, the terminal may measure a larger RSRP for a cell (eg, cell 1) deployed at a low frequency. When the transmission power is the same, since the path loss at low frequency is less than the path loss at high frequency, the terminal has a larger RSRP for cell 1 at the same site. Can be obtained. In this case, the terminal tends to have initial access to the cell 1. However, since this is independent of the traffic load condition of the cell and RSRP is a function of the propagation distance between the terminal and the cell, even when the traffic load of the cell is large, the serving base station may transmit the terminal to the cell. Associate. Thereafter, the serving base station performs load balancing to signal a handover command for handing over some of the serving terminals to a cell (eg, cell 2) deployed at a high frequency. do. These operations consume a lot of control plane latency. The eMBB scenario is not significantly affected by this control plane delay, but the URLLC scenario should also reduce this control plane delay. Accordingly, the UE may search for a cell having a low load and then perform a cell selection procedure and a cell reselection procedure.

The UE belonging to the RRC idle (RRC_IDLE) state may also measure the load of the cell.

After the session is completed, the UE in the RRC_CONNECTED state operates in an RRC idle state after a predetermined time determined by a DRx cycle or an RRC connection timer set by the serving cell. After that, if the DL session occurs again, the serving cell base station searches for the terminal through paging, and when the UL session occurs, the terminal performs initial access (initial access) in the camped-on cell (camped-on cell). Since the UE in the RRC idle state (RRC_IDLE) determines the camping cell based on RSRP or RSRQ, it has a tendency to select a cell (eg, cell 1). However, since this still does not take into account the load, hand balancing by load balancing must be performed frequently, resulting in increased control plane delay. Therefore, in order to actively support URLLC, the UE may perform a cell selection procedure by reflecting a DL load and perform a cell selection procedure by reflecting a UL load.

6 is a diagram illustrating resources that a 3GPP NR reference system has in one subframe / slot. Specifically, FIG. 6 illustrates a case in which resources are divided into six (eg, fixed DL resources, resource A, resource B, resource C, resource E, and resource E). In Figure 6, the horizontal axis represents subframes and the vertical axis represents system bandwidth.

In FIG. 6, the DL region and the UL region are not divided. The time boundary and frequency boundary of a resource will be described based on the numerology used by the fixed DL resource.

In FIG. 6, the fixed DL resource includes information such as a synchronization signal, DL NR-DRS, PDCCH, and PBCH. This information corresponds to essential information for standalone operation. The fixed DL resource uses one type of neurology defined by the TS. The fixed DL resource may consist of a set of adjacent REs. Alternatively, the fixed DL resource may be configured such that the RE sets are not adjacent to each other on the frequency axis in order to obtain diversity.

In FIG. 6, resource A is composed of symbols including fixed DL resources, and is composed of subcarriers belonging to the allowed measurement bandwidth allowed for the terminal but not belonging to the fixed DL resources. The fixed DL resource and the resource A may use different neurology. If half-duplex is used in 3GPP NR, resource A belongs to DL resource.

In FIG. 6, resource B is composed of resources that do not belong to a measurement bandwidth among resources belonging to a symbol including a fixed DL resource. The fixed DL resource and the resource B may use different neurology. In the case where half-duplex is used in 3GPP NR, resource B belongs to DL resource.

In FIG. 6, resource C uses the same subcarrier as the subcarrier for the fixed DL resource, but uses a symbol different from the symbol for the fixed DL resource. The fixed DL resource and the resource C may use different neurology. If the subframe / slot type includes a GP, part of the resource C belongs to the GP and the other part belongs to the UL region.

In FIG. 6, resource D is composed of resources belonging to a subcarrier not used by a fixed DL resource among subcarriers belonging to a measurement bandwidth, and is composed of resources belonging to a symbol not used by a fixed DL resource. The fixed DL resource and the resource D may use different numerologies. If a GP is included in the subframe / slot type, part of the resource D belongs to the GP and the other part belongs to the UL region.

In FIG. 6, resource E is composed of resources that do not belong to the symbol for fixed DL resources while not belonging to the measurement bandwidth. The fixed DL resource and the resource E may use different neurology. If a GP is included in the subframe / slot type, part of the resource E belongs to the GP and the other part belongs to the UL region.

RRM measurements that apply to 3GPP NR systems are defined. As a function between traffic load and RSRP, an RRM metric can be defined.

The RRM metric of the 3GPP NR system cannot use RSRP, RSRQ, and RS-SINR of 3GPP LTE as it is in the 3GPP NR system. Since the DL NR-DRS resource includes a fixed DL resource, the UE can measure RSRP.

The RSSI measurement method for measuring the RSRQ will be described. The time and frequency boundaries of the resources used for RSSI measurements are defined. A 3GPP NR system using several numerologies may define symbol boundaries according to the neuralology used by fixed DL resources. Based on the numerology used by the fixed DL resources, the measurement bandwidth defines a subcarrier boundary. In this case, since two or more numerologies are used, subcarriers located at the boundary of the measurement bandwidth are utilized for the guard band. Thus, the energy received at these subcarriers may not be reflected in the value of RSSI.

For RS-SINR measurement, the SINR must be measured at the same RE as the RE for RS. However, since this is a resource confined within a fixed DL resource, it is a value measured regardless of the traffic load.

The energy measured in the RE and the energy measured in the symbol need to be distinguished. In the case of RSRP measured in DL NR-DRS resources, the UE removes a cyclic prefix (CP) from the received symbols and extracts a subcarrier having DL NR-DRS in the frequency domain. Thereafter, the terminal configures the sequence only with subcarriers having DL NR-DRS. The terminal performs coherent detection by comparing the configured sequence with a DL NR-DRS sequence already known to the terminal. On the other hand, when energy detection is performed on a symbol, the terminal does not need to perform coherent detection and measures energy received within a time boundary of the symbol. Since only a specific subcarrier is not processed separately, the UE may measure energy measured in a symbol in the time domain.

If a resource corresponding to a specific RE is removed from the RSSI measurement resource, separate processing is required. For example, a case in which an RE including a DL NR-DRS resource is excluded from the RSSI measurement resource may be considered. The terminal removes a cyclic prefix (CP) from the symbol and extracts a subcarrier having a DL NR-DRS in the frequency domain. The terminal calculates energy from the remaining subcarriers.

The unit for measuring RSSI in the RSSI measurement resource may be RE instead of a symbol, and the above-described method may be applied when RSSI is measured in RE unit.

RSRQ applicable to 3GPP NR system may be defined as a function between RSRP and RSSI. For example, RSRQ may be determined by the ratio between RSRP and RSSI / N. Here, the value of N corresponds to the number of PRBs used by the UE for RSSI measurement. As another example, the RSRQ may be determined by the ratio between RSRP and (RSRP + RSSI / N).

The 3GPP NR

TDD reference systems

1, 2, and 3 may define multiple neurolologies, and the TS may allocate fixed DL resources for each neurolography. In this case, if the UE knows all of these fixed DL resources, the UE may perform RRM measurement by utilizing all of several fixed DL resources.

The RSSI measurement method (method RSSI0-1, method RSSI0-2, method RSSI0-3, etc.) for 3GPP NR cells will be described.

Method RSSI0-1 assumes that the UE does not know the corresponding subframe / slot type since the 3GPP NR TDD reference system 1 may operate in dynamic TDD.

7 is a diagram illustrating a method RSSI0-1, in accordance with an embodiment of the present invention. Specifically, RSRP measurement resources are illustrated in (a) of FIG. 7 and RSSI measurement resources are illustrated in (b) of FIG. 7.

Method RSSI0-1 assumes that method IND1 and method IND2 are not used.

As illustrated in (a) of FIG. 7, the RSRP may be measured in the RE for the DL NR-DRS among the REs belonging to the fixed DL resource. As illustrated in FIG. 7B, the RSSI may be measured in symbol (s) belonging to the resource A and the fixed DL resource. That is, the RSSI may be measured on a resource belonging to a symbol having a fixed DL resource and belonging to a measurement bandwidth. The energy collected by all UEs that can be known as a DL region is used for RSSI.

However, by this measuring method, the UE cannot accurately measure the DL traffic load of the NR cell. Since fixed DL resources transmit physical signals and physical channels that are essential for system operation rather than DL data, RSSI over-estimates the DL traffic load. In addition, since the UE measures RSRP and RSSI in different PRBs (eg, resource A), RSSI may experience a different frequency response from RSRP according to frequency selective fading, and RSRP and RSSI may be different from each other. May experience DL interference. On the other hand, RSSI used for 3GPP LTE RSRQ is a function of DL interference, and RSSI is independent of frequency selective fading because RSRP and RSSI are measured in the same band.

When the 3GPP NR TDD reference system 2 and the 3GPP NR TDD reference system 3 operate with dynamic TDD, an embodiment of the present invention may be applied.

8 is a diagram illustrating a method RSSI0-1-1, in accordance with an embodiment of the present invention. Specifically, RSRP measurement resources are illustrated in (a) of FIG. 8, and RSSI measurement resources are illustrated in (b) of FIG. 8.

Method RSSI0-1-1 for Method RSSI0-1 measures RSRP in an RE including a DL NR-DRS among REs belonging to a fixed DL resource, as illustrated in FIG.

As illustrated in (b) of FIG. 8, the method RSSI0-1-1 measures RSSI in a symbol belonging to resource A and a fixed DL resource, but on a subcarrier that does not include DL NR-DRS.

RSSI may be measured in a symbol or may be measured in an RE. That is, RSSI refers to the remaining subcarriers other than the DL NR-DRS resource among the subcarriers belonging to a symbol having a fixed DL resource. Here, the DL NR-DRS resource means a collection of DL NR-DRS resources transmitted by each of the 3GPP NR cells. A UE in an RRC idle state must detect a DL NR-DRS resource corresponding to a part of the entire set of DL NR-DRSs, and a UE in an RRC_CONNECTED state is a DL NR-DRS configured from a serving base station. A set of resources may be applied or some DL NR-DRS resources may be detected by themselves.

Since the terminal does not measure the RSSI in the DL NR-DRS resource, the RSSI measured by the terminal may include all of the PDCCH, SIB, and PDSCH of the NR cell.

This RSSI measurement method measures both the control channel load and the DL traffic load of the NR cell at the terminal. Since the control channel load of the NR cell includes DL scheduling assignment and UL scheduling grant, the UE can infer the amount of DL traffic and the amount of UL traffic. The accuracy of this guess is low. Since the beamforming of the PDCCH, the CCE aggregation level, and the beamforming of the PDSCH are different from each other, an interference condition is difficult to guess. The amount of UL traffic cannot be measured from the PUSCH and can be indirectly inferred from the amount of PDCCH.

In addition, among the portions of the resource A, a resource having a neuron and a different one for the fixed DL resource may be allocated by the 3GPP NR cell. In this case, since a separate PDCCH can be allocated by the 3GPP NR cell, the RSSI measured at the resource A reflects not only the data load but also the control load. In this case, since the control channel transmitted in this case is usually transmitted to the terminal in the RRC_CONNECTED state, the beam formation of the control channel and the beam formation of the data channel may not be significantly different.

9 is a diagram illustrating a method RSSI0-1-2, in accordance with an embodiment of the present invention. Specifically, RSRP measurement resources are illustrated in FIG. 9A, and RSSI measurement resources are illustrated in FIGS. 9B and 9C.

Method RSSI0-1-2 for Method RSSI0-1 measures RSRP at a RE including DL NR-DRS among REs belonging to a fixed DL resource, and measures RSSI belonging to resource A, resource B, and fixed DL resource. Measure at the symbol.

RSSI may be measured at the symbol level or may be measured at the RE level. If the RSSI is measured in the RE, the RSSI may be measured in the RE which does not include the DL NR-DRS. FIG. 9B illustrates a case where RSSI is measured in the entire symbol (eg, fixed DL resource, resource A, resource B). In FIG. 9C, the RSSI is measured in an RE that does not include the DL NR-DRS (eg, other REs except the DL-NR DRS RE among the REs belonging to the fixed DL resource, resource A, and resource B). The case is illustrated.

According to this scheme, the terminal may measure the RSSI in the symbol including the fixed DL resource, regardless of the subframe / slot type.

The method RSSI0-2 assumes that the 3GPP NR TDD reference system 1 operates in dynamic TDD and the UE can know the subframe / slot type through the method IND1.

10 is a diagram illustrating a method RSSI0-2, in accordance with an embodiment of the present invention. Specifically, RSRP measurement resources are illustrated in FIG. 10A, and RSSI measurement resources are illustrated in FIG. 10B.

The terminal may distinguish a resource corresponding to the DL region from the resource C and the resource D. FIG. RSSI may be measured at the symbol level or may be measured at the RE level.

As illustrated in (a) of FIG. 10, the terminal measures RSRP using DL NR-DRS resources belonging to a fixed DL resource.

As illustrated in (b) of FIG. 10, the terminal may measure the RSSI in a DL region belonging to a measurement bandwidth. That is, the terminal can measure the RSSI in the fixed DL resource, resource A, resource C, and resource D.

The RSSI measurement method can be simply implemented, but the control channel or DL NR-DRS resource included in the fixed DL resource does not properly reflect the traffic load.

The 3GPP NR cell may allocate PDCCHs having different neurons from resource A, resource C, and resource D in order to deliver data scheduling assignment to the UE in an RRC_CONNECTED state. This is not a data load. However, since this corresponds to a physical channel allocated in proportion to the cell load, it may be reflected in the RSSI measurement.

Since the PRB in which the RSSI is measured and the PRB in which the RSRP is measured are different, the frequency selectivity of the channel may affect the RSSI.

When the 3GPP NR TDD reference system 2 and the 3GPP NR TDD reference system 3 operate with dynamic TDD, an embodiment of the present invention may be applied. A resource corresponding to a DL region is extracted from the resource C and the resource D, and an embodiment of the present invention is applied to the extracted resource.

11 is a diagram illustrating a method RSSI0-2-1, in accordance with an embodiment of the present invention. Specifically, RSRP measurement resources are illustrated in FIG. 11A, and RSSI measurement resources are illustrated in FIG. 11B.

Method RSSI0-2-1 for Method RSSI0-2 assumes that 3GPP NR TDD Reference System 1 operates in dynamic TDD and the UE knows a subframe / slot type through method IND1.

The terminal may identify a resource corresponding to the DL region from the resource C. RSSI may be measured at the symbol level or may be measured at the RE level.

As illustrated in (a) of FIG. 11, the UE measures RSRP using DL NR-DRS resources belonging to a fixed DL resource.

As illustrated in (b) of FIG. 11, the terminal may measure the RSSI in the fixed DL resource and the resource C. FIG.

Since the UE measures RSRP and RSSI in the same PRB, the channel frequency selectivity for RSRP and RSSI is equally reflected in the calculation.

When the 3GPP NR TDD reference system 2 and the 3GPP NR TDD reference system 3 operate with dynamic TDD, an embodiment of the present invention may be applied. A resource corresponding to a DL region is extracted from the resource C, and an embodiment of the present invention may be applied to the extracted resource.

12 is a diagram illustrating a method RSSI0-2-2 for a method RSSI0-2, according to an embodiment of the present invention. Specifically, RSRP measurement resources are illustrated in (a) of FIG. 12, and RSSI measurement resources are illustrated in (b) of FIG. 12.

As illustrated in (a) of FIG. 12, the UE may measure RSRP using DL NR-DRS resources.

As illustrated in (b) of FIG. 12, the UE may measure the RSSI on the remaining resources except the DL NR-DRS resources among the fixed DL resources.

If the UE can extract the DL region in the resource C using the method IND2, the extracted DL region is used for RSSI measurement. If the UE cannot detect the presence of a GP in resource C using the method IND2, resource C is not used for RSSI measurement.

RSSI may be measured at the symbol level or may be measured at the RE level.

According to the method IND2, in the case of the 3GPP NR terminal located at the boundary of coverage, since the detection probability of the GP is reduced, the amount of resources used for the RSSI is small. On the other hand, in the case of 3GPP NR terminals located in the cell center, the amount of resources used for RSSI is relatively larger. Thus, when the method IND2 is used, the position of the terminal affects the RSRQ measurement delay.

Resources utilized for RSSI include at least fixed DL resources, but do not include DL NR-DRS resources. A UE in an RRC idle state must detect a DL NR-DRS resource corresponding to a part of the entire set of DL NR-DRSs, and a UE in an RRC_CONNECTED state is a DL NR-DRS configured from a serving base station. A set of resources may be applied or some DL NR-DRS resources may be detected by themselves. In the RSSI measurement resource defined as above, since the PDCCH is included in the fixed DL resource and the PDCCH is transmitted periodically, the DL data load is not accurately represented. In this case, since the PDCCH transmitted is usually transmitted to a UE in an RRC_CONNECTED state, beamforming of the PDCCH and beamforming of the PDSCH may not be significantly different. Therefore, when the DL data load is measured in the fixed DL resource, a physical channel and a physical signal having UE-specific beamforming may be included in the fixed DL resource.

13 is a diagram illustrating a method RSSI0-2-3, in accordance with an embodiment of the present invention. Specifically, RSRP measurement resources are illustrated in (a) of FIG. 13 and RSSI measurement resources are illustrated in (b) of FIG. 13.

Method RSSI0-2-3 for method RSSI0-2 is applicable when 3GPP NR TDD Reference System 1 operates with dynamic TDD and the NR cell uses method IND1 to explicitly know the subframe / slot type. .

As illustrated in (a) of FIG. 13, the UE measures RSRP using DL NR-DRS resources.

As illustrated in (b) of FIG. 13, the UE measures the RSSI in the DL region of the resource C. RSSI may be measured at the symbol level or may be measured at the RE level.

In the case where the 3GPP NR cell uses more than one neuron, multiple N's are applied to resource C. The 3GPP NR cell may allocate a separate control channel for this to resource C. Therefore, when the UE measures the RSSI using the resource C, the control load and the data load are measured together. Since the PDCCH indicates the DL scheduling assignment or the UL scheduling grant to the UE in the RRC_CONNECTED state, beamforming of the PDCCH is performed not significantly different from beamforming of the PDSCH. The terminal may measure the DL load to some extent through the RSSI.

The method RSSI0-3 corresponds to the case where the 3GPP NR TDD Reference System 1, the 3GPP NR TDD Reference System 2, and the 3GPP NR TDD Reference System 3 operate with dynamic TDD.

According to the method RSSI0-3, the UE measures the RSRP using the DL NR-DRS resource (eg, FIG. 13A) and measures the RSSI at the resource C (eg, FIG. 13B). RSSI may be measured at the symbol level or may be measured at the RE level.

The 3GPP NR cell may utilize resource C for any subframe / slot type. On the other hand, regardless of the subframe / slot type, the terminal utilizes all symbols belonging to resource C and belonging to the measurement bandwidth as RSSI measurement resources. This method corresponds to a summation method that is independent (or equivalent) of the DL load and the UL load.

The utilization method for the case in which the UE measures the UL load is as follows. When the UE in the RRC idle (RRC_IDLE) generates UL traffic corresponding to the URLLC service, the UL traffic load is reflected in the RRM measurement to associate with an NR cell having a low UL traffic load. In this case, control plane latency can be reduced.

There is a case where the proximity of the terminal affects the UL traffic load. For example, among two geographically adjacent terminals, a terminal performing RRM measurement acts as a victim and another terminal receiving UL scheduling grant and transmitting UL data acts as an attacker. There is. In this case, since the distance between terminals is short, RSSI is over-estimated even if the UL traffic load is small. However, when the UL traffic load continuously occurs to affect the RSSI measurement, since the two terminals are geographically adjacent, the UL resource region is difficult to be SDM and must be TDM or FDM. In this case, the control plane delay for receiving the UL scheduling grant is large.

The serving base station may set the RRM measurement for the inter-frequency (inter-frequency) to the terminal. When the terminal does not have a sufficient number of receiver units (RxU), the serving base station sets the measurement gap (measurement gap) to the terminal, the terminal uses the measurement gap RSRP, for a cell (or base station) belonging to the inter frequency RSRQ, or RSRP and RSRQ can be measured. Setting of the measurement gap includes the measurement gap length, the measurement gap repetition period, and the subframe offset (or slot offset) of the first subframe (or first slot) belonging to the measurement gap. It includes at least.

The specific frequency and the specific base station measured by the terminal in the measurement gap are not set by the serving base station, but are selected by the terminal according to the implementation algorithm of the terminal. The serving base station should set an appropriate measurement gap in the terminal so that the terminal can achieve sufficient RRM measurement accuracy within a predetermined time.

The serving base station sets a measurement gap in the terminal, and the terminal measures a signal and a physical channel belonging to a specific frequency within the measurement gap. For example, such a signal includes at least a main synchronous signal (PSS), a floater signal (SSS), an RRM signal (hereinafter 'RRS'), and a PBCH DM-RS, and may include a DL NR-DRS. And this physical channel includes at least a broadcast channel (eg, PBCH).

The serving base station treats the main synchronizer signal, the floater signal, and the broadcast channel as one transmission unit, and may transmit one or more transmission units in sequence over time. For example, this transmission unit is referred to as SS burst in NR, and the maximum number of SS bursts is defined in the specification according to the frequency band in which the serving base station operates. The serving base station actually transmits fewer SS bursts than this maximum number, and the period in which the SS bursts are transmitted is defined in the specification.

However, when the serving base station sets the measurement gap to a specific terminal, the period and slot offset in which the SS burst is transmitted may be transmitted by the serving base station. Here, the period and slot offset at which the SS burst is transmitted may have a value selected by the serving base station from among values not defined in the standard as well as values defined by the standard.

Since the UE uses the measurement gap to perform the RRM measurement for the inter frequency, the serving base station and the neighboring base stations can transmit the SS burst in the slot belonging to the corresponding measurement gap. Since the terminal may not receive the SS burst in the measurement gap, the serving base station may set the measurement gap and the measurement frequency to the terminal. For example, the serving base station sets one or more measurement gaps to the terminal and sets each measurement gap to be associated with a specific frequency band. Therefore, the configuration information of the measurement gap not only includes the period and the slot offset of the measurement gap, but also includes at least a frequency resource to be measured by the terminal in the slot belonging to the measurement gap. The frequency resource may be represented by a relative index (eg, cell index, etc.) or may be represented by an absolute index (eg, frequency identification information, etc.). Here, the frequency identification information may be an absolute radio-frequency channel number (ARFCN).

The terminal performs the measurement in the slot and the measurement frequency belonging to the measurement gap. Here, the physical quantity measured by the terminal may be RSRP, RSRQ, RS-SINR, or any combination thereof, depending on the setting of the serving base station.

If the base stations are operating in dynamic TDD at the measurement frequency, a scenario in which the UE should measure the RSRQ is considered. In this case, the terminal receives a common search space (CSS) of the PSTICH or the PDCCH from each base station, and recognizes the STI based on this. The UE derives a DL region using the STI and then measures the RSRQ.

If the base stations operate beam-centric at the measurement frequency to treat the main and floating signals as a unit (e.g., SS burst), and these units are transmitted to form a set of SS bursts. Is considered. It is assumed that the terminal can observe at least one or more periods of SS bursts within the measurement gap, and it is assumed that the base station applies the same preprocessing to signals belonging to one SS burst. The UE performs RRM measurement using RRS resources belonging to the SS burst and derives different RRM measurements for different preprocesses. For example, if one serving base station transmits four SS bursts, the UE assumes that four different preprocesses exist and distinguishes RRS resources belonging to each SS burst from each other, and performs four RRM measurements. The terminal receiving the RSRP measurement may derive four RSRPs, and the terminal receiving the RSRQ measurement may derive four RSRQs.

14 illustrates NR-SIB transmission according to an embodiment of the present invention. Specifically, Fig. 14 illustrates the case where the method C2-2 is used.

In FIG. 14, FI101 represents the period of NR-subframe / slot in which DL NR-DRS is transmitted. In an NR-subframe / slot in which DL NR-DRS is transmitted, one or more DL NR-DRS resources are transmitted. One DL NR-DRS resource corresponds to a virtual sector of the base station. The period of the DL NR-DRS may use a value defined by the specification.

In FIG. 14, FI102 represents a DL NR-DRS occlusion duration. The base station may transmit DL NR-DRS resources in a continuous and valid DL NR-subframe / slot. The DL NR-DRS Occasion Period is for expansion of DL coverage. Since the base station transmits the NR-PBCH based on the DL NR-DRS antenna port, the base station may transmit the corresponding DL NR-PBCH in the DL NR-DRS occasion period. The base station may set the value of the DL NR-DRS occasion interval to the terminal through higher layer signaling. When there is no separate signaling from the base station, the terminal estimates the value of the DL NR-DRS occasion period through blind detection.

In FIG. 14, FI103 represents a frequency resource including a DL NR-DRS and an NR-PBCH. For example, FI103 may be represented by an NR-RB index or a combination of a subband index and an NR-RB index.

In FIG. 14, FI104-1 indicates the location of time resource of the UL NR-DRS resource. The terminal estimates FI104-1 from the NR-PBCH transmitted by virtual sector 1 of the base station. The time resource is a relative value based on the first NR subframe / slot belonging to the DL NR-DRS occasion period and may be defined as an NR subframe / slot offset or a symbol offset. Alternatively, the time resource is an absolute value of the NR subframe / slot to which the UL NR-DRS resource belongs, and may be defined as an NR subframe / slot index. For example, the transmission time of the UL NR-DRS resource may be a symbol belonging to the same NR-subframe / slot as the transmission time of the DL NR-DRS resource. In this case, the location of the time resource corresponds to a symbol offset. For another example, UL NR-DRS resources may be set in separate NR-subframes / slots. In this case, the location of the time resource corresponds to the NR-subframe / slot offset.

In FIG. 14, FI104-2 indicates a location of a time resource of a UL NR-DRS resource. The terminal estimates FI104-2 from the NR-PBCH transmitted by virtual sector 2 of the base station. FI104-2 has the same meaning as FI104-1.

If the base station transmits more than one virtual sector, several UL NR-DRS resources may be configured.

In FIG. 14, FI105-1 indicates a location of frequency resources of UL NR-DRS resources. The terminal estimates FI105-1 from the NR-PBCH transmitted by the virtual sector 1 of the base station. For example, FI105-1 may be represented by an NR-RB index or a combination of a subband index and an NR-RB index.

In FIG. 14, FI105-2 indicates the position of a frequency resource of the UL NR-DRS resource. The terminal estimates FI105-2 from the NR-PBCH transmitted by the virtual sector 2 of the base station. FI105-2 has the same meaning as FI105-1.

In FIG. 14, FI106 represents a radio resource including a DL NR-DRS and an NR-PBCH.

In FIG. 14, FI107-1 represents a radio resource including the UL NR-DRS. When the terminal selects the virtual sector 1, the UL NR-DRS may be transmitted using FI107-1.

In FIG. 14, FI107-2 represents a radio resource including the UL NR-DRS. When the terminal selects the virtual sector 2, the UL NR-DRS may be transmitted using FI107-2.

In FIG. 14, FI108 represents a bandwidth to which DL NR-DRS resource and NR-PBCH are allocated. FI108 may use the value defined by the specification.

In FIG. 14, FI109 represents a bandwidth to which an UL NR-DRS resource is allocated. The terminal uses FI109 as a value defined by the standard, or uses FI109 as a value set by the NR-PBCH transmitted by the base station.

In FIG. 14, FI110 represents an amount of time resource to which an NR-PDCCH is allocated. The terminal uses FI110 as a value defined by the standard, or uses the FI110 as a value set by the NR-PBCH transmitted by the base station. For example, NR-PDCCH may be defined by the number of symbols. For another example, the NR-PDCCH may be defined in units of NR-subframes / slots.

In FIG. 14, FI111 represents a bandwidth to which an NR-PDCCH is allocated. The terminal uses FI111 as a value defined by the standard, or uses FI111 as a value set by the NR-PBCH transmitted by the base station.

In FIG. 14, FI112-1 represents the frequency location of the NR-PDCCH resource transmitted by virtual sector 1 of the base station. The base station may set the frequency location of a separate NR-PDCCH resource for another virtual sector. Alternatively, the base station may set the same frequency position of the NR-PDCCH resource regardless of the virtual sector index. Alternatively, the frequency location of the NR-PDCCH resource may be defined by the standard.

In FIG. 14, FI113-1 represents an NR-PDCCH resource transmitted by virtual sector 1 of the base station.

In FIG. 14, FI114 represents a period in which the NR-PDCCH is transmitted. When the NR-PDCCH is transmitted in symbol units, the NR-PDCCH appears every difference between the first symbols to which the NR-PDCCH is allocated. When the NR-PDCCH is transmitted in units of NR-subframes / slots, the NR-PDCCHs appear every difference between the NR-subframes / slots.

15 illustrates a virtual sector of a base station according to an embodiment of the present invention. The cell of the base station may be virtually subdivided into multiple virtual sectors. In detail, four virtual sectors FI2-1, FI2-2, FI2-3, and FI2-4 are illustrated in FIG. 15.

16A and 16B illustrate a procedure for a base station (or serving cell) to transmit an NR-SIB to a terminal according to an embodiment of the present invention. In FIG. 16A, NR-DRSRP means RSRP based on NR-DRS. The procedures ST10-ST20 illustrated in FIGS. 16A and 16B can be applied when the method R2 and the method C1 (or the method C2) are used.

17 illustrates a computing device, in accordance with an embodiment of the present invention. The computing device TN100 of FIG. 17 may be a base station or a terminal described herein. Alternatively, the computing device TN100 of FIG. 17 may be a wireless device, a communication node, a transmitter, or a receiver.

In the embodiment of FIG. 17, the computing device TN100 may include at least one processor TN110, a transceiver TN120 connected to a network to perform communication, and a memory TN130. In addition, the computing device TN100 may further include a storage device TN140, an input interface device TN150, an output interface device TN160, and the like. Components included in the computing device TN100 may be connected by a bus TN170 to communicate with each other.

The processor TN110 may execute a program command stored in at least one of the memory TN130 and the storage device TN140. The processor TN110 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to an embodiment of the present invention are performed. Processor TN110 may be configured to implement the procedures, functions, and methods described in connection with embodiments of the present invention. The processor TN110 may control each component of the computing device TN100.

Each of the memory TN130 and the storage device TN140 may store various information related to an operation of the processor TN110. Each of the memory TN130 and the storage device TN140 may be configured of at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory TN130 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

The transceiver TN120 may transmit or receive a wired signal or a wireless signal. The computing device TN100 may have a single antenna or multiple antennas.

On the other hand, the embodiment of the present invention is not implemented only through the apparatus and / or method described so far, but may be implemented through a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Such implementations can be readily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

Establishing a first resource for a physical downlink control channel (PDCCH);

Including the configuration information of the first resource in a first physical broadcast channel (PBCH); And

Transmitting the first PBCH

Transmission method of the base station comprising a.
The method of claim 1,

The configuration information of the first resource includes an index of a resource block (RB) where the first resource starts and a bandwidth occupied by the PDCCH.

Transmission method of base station
The method of claim 1,

Setting a second resource for an uplink (UL) discovery reference signal (UL) transmitted by the terminal; And

Incorporating configuration information of the second resource into the first PBCH.

Transmission method of the base station further comprising.
The method of claim 3,

Setting the second resource,

Setting the second resource to a number equal to the number of virtual sectors used by the base station;

Transmission method of the base station.
The method of claim 3,

Including the configuration information of the second resource in the first PBCH,

When the first PBCH is cell-specifically transmitted, generating one first PBCH having a bit width corresponding to the number of virtual sectors used by the base station; And

Generating a plurality of first PBCHs for the virtual sectors when the first PBCH is transmitted in virtual sector-specific manner.

Transmission method of the base station.
The method of claim 3,

Transmitting the first PBCH,

Transmitting a first synchronization signal (SS) burst comprising the first PBCH, a first primary synchronization signal (PSS), and a first secondary synchronization signal (SSS); And

Transmitting a second SS burst comprising a second PBCH, a second PSS, and a second SSS having the same RV as the redundancy version (RV) of the first PBCH.

Transmission method of the base station.
The method of claim 3,

Transmitting the first PBCH,

Transmitting a first synchronization signal (SS) burst comprising the first PBCH, a first primary synchronization signal (PSS), and a first secondary synchronization signal (SSS); And

Transmitting a second SS burst comprising a second PBCH, a second PSS, and a second SSS having an RV different from the redundancy version (RV) of the first PBCH.

Transmission method of the base station.
The method of claim 7, wherein

The scrambling resource for the first PBCH is different from the scrambling resource for the second PBCH.

Transmission method of the base station.
The method of claim 7, wherein

The cyclic redundancy check (CRC) mask for the first PBCH is different from the CRC mask for the second PBCH.

Transmission method of the base station.
Generating a first indicator indicating the type of the slot;

Including the first indicator in a physical downlink control channel (PDCCH); And

Transmitting the PDCCH to a terminal through a fixed downlink (DL) resource

Transmission method of the base station comprising a.
The method of claim 10,

The first indicator indicates whether the slot is a DL slot, a DL-centric slot, an UL slot, an uplink (UL) -centric slot,

If the slot is the DL slot, there is no UL region in the slot,

If the slot is the UL slot, there is no DL region in the slot,

If the slot is the DL-centric slot, the DL area of the slot is larger than the UL area of the slot,

If the slot is the UL-centric slot, then the UL area of the slot is larger than the DL area of the slot.

Transmission method of the base station.
The method of claim 10,

Transmitting the PDCCH,

Transmitting the first indicator by using one or more first REGs corresponding to identification information of the base station among resource element groups (REGs) belonging to the fixed DL resource;

Transmission method of the base station.
The method of claim 12,

Mapping a PDCCH candidate different from the PDCCH to remaining REGs other than the one or more first REGs among the REGs;

Transmission method of the base station further comprising.
The method of claim 12,

Transmitting the first indicator using the one or more first REGs,

Positioning the one or more first REGs in a time domain symbol that is at the earliest of time domain symbols belonging to the slot;

Transmission method of the base station.
The method of claim 12,

Transmitting the first indicator using the one or more first REGs,

Mapping the one or more first REGs to a plurality of frequencies.

Transmission method of the base station.
Determining a number of time domain symbols for downlink (DL) among time domain symbols belonging to a slot;

Determining a type of the slot; And

Transmitting a first channel including the determined number and the determined type through a common search space for a control channel

Transmission method of the base station comprising a.
The method of claim 16,

The first channel,

Decodable by a UE that is not connected to the RRC (radio resource control)

Transmission method of the base station.
The method of claim 16,

Transmitting the first channel,

One or more first REGs for transmitting a first indicator indicating the determined type among resource element groups (REGs) belonging to a resource for the control channel; Positioning the symbol

Transmission method of the base station.
The method of claim 16,

Transmitting the first channel,

Mapping one or more first REGs to a plurality of frequencies for transmitting a first indicator indicating the determined type among resource element groups (REGs) belonging to a resource for the control channel;

Transmission method of the base station.
The method of claim 16,

The time domain symbols for the DL are

Used for radio resource management (RRM) measurement or channel state information (CSI) measurement

Transmission method of the base station.