WO2018008981A1 - Transmitting method and device using numerology, and scheduling method and device using numerology - Google Patents

Abstract

The present invention relates to a transmitting method of a base station including: a step of generating a physical channel or physical signal using a PRB which is a resource allocation unit on frequency axis; and a step of transmitting the physical channel or physical signal, wherein intervals of sub-carriers for a plurality of numerologies are defined to be different from each other, the number of sub-carriers belonging to a first PRB to which a first numerology from among the plurality of numerologies is applied is equal to the number of sub-carriers belonging to a second PRB to which a second numerology from among the plurality of numerologies is applied, and the boundary of the first PRB is arranged at the boundary of the second PRB.

Description

Method and apparatus for transmission using pneumatic, and Scheduling method and apparatus for pneumatic

The present invention relates to a transmission method and apparatus using numerology, and to a scheduling method and apparatus using numerology.

The mobile communication system after the long term evolution (LTE), which is represented by the 5th generation (5G), must satisfy various technical requirements for providing a wide range of application services and scenarios, as well as high-speed data transmission, which was the main concern of the prior art. Accordingly, the 3rd generation partnership project (3GPP) is developing a new mobile communication standard that satisfies the requirements of international mobile telecommunications (IMT) -2020. The name of the new standard is NR (new radio). The main application scenarios for NR are the provision of ultra-high speed data transmission (e.g. enhanced mobile broadband (eMBB)), the provision of high reliability and low latency (e.g. ultra-reliable low latency communication (URLLC)), and large scale terminal connectivity (e.g. providing of mMTC (massive machine type communication).

NR utilizes a wide range of frequency bands, including millimeter wave bands, to dramatically improve data rates. The sub-1 GHz band to the 100 GHz band are considered candidate frequency bands of NR. The International Telecommunication Union (ITU) is considering the band 24.25 to 86 GHz as a candidate frequency band for the IMT-2020.

Systems that support a variety of services and frequency domains, such as NR, should be able to vary the numerology used to form physical signal waveforms. For example, in the case of an orthogonal frequency division multiplexing (OFDM) based system, subcarrier spacing suitable for channel characteristics of a transmission frequency band may be used. For example, a subcarrier spacing of 15 kHz may be used in a band of 6 GHz or less, and a subcarrier spacing of 120 kHz may be used in a band of 6 GHz or more. In addition, even if the frequency bands are the same, different neuronologies may be used according to the characteristics of the provided service. For example, in the band below 6 GHz, a subcarrier spacing of 15 kHz may be used for eMBB transmission, and a subcarrier spacing of 60 kHz may be used for URLLC transmission.

Therefore, there is a need for a method for supporting flexible transmission and reception through various neurology.

The problem to be solved by the present invention is to provide a method and apparatus for supporting flexible transmission and reception through a variety of neurology.

Another object of the present invention is to provide a method and apparatus for supporting flexible resource allocation (or scheduling) in a next generation communication system.

Another object of the present invention is to provide a method and apparatus for transmitting a signal or channel through a plurality of numerology in one carrier.

According to an embodiment of the present invention, a transmission method of a base station is provided. The transmission method of the base station comprises the steps of: generating a physical channel or a physical signal using a physical resource block (PRB) which is a frequency axis resource allocation unit; And transmitting the physical channel or the physical signal.

Subcarrier spacings for a plurality of numerologies may be defined differently.

The number of subcarriers belonging to the first PRB to which the first neuralology is applied among the plurality of numerologies is the number of subcarriers belonging to the second PRB to which the second neuralology is applied. May be the same as

The boundary of the first PRB may be aligned with the boundary of the second PRB.

At least one of the subcarriers belonging to the first PRB may be aligned with at least one of the subcarriers belonging to the second PRB.

The bandwidth of the first PRB may be 2 ^N times (where N is an integer) of the bandwidth of the second PRB.

There may be a first direct current (DC) subcarrier for the first pneumonia and a second DC subcarrier for the second pneumonia.

The position of the first DC subcarrier may be the same as the position of the second DC subcarrier.

The first neuterology may be a neuralology applied to a downlink synchronization signal used for initial access among the plurality of neuralology.

Based on the first PRB, the number of PRBs included in one carrier may be an even number regardless of the system bandwidth.

In addition, according to another embodiment of the present invention, a scheduling method of a base station is provided. The scheduling method of the base station includes: setting a physical resource block (PRB) group to the first terminal; Setting a neutralizer for a PRB group configured for the first terminal among a plurality of numerologies defined by subcarrier spacing and cyclic prefix length, to the first terminal; And scheduling at least one PRB from among a plurality of PRBs included in a PRB group configured for the first terminal, to the first terminal.

The plurality of PRBs included in the PRB group configured for the first terminal may be continuous on the frequency axis.

The PRB group configured for the first terminal may be a plurality, and the plurality of PRB groups may include a first PRB group and a second PRB group.

The setting of the numerology to the first terminal may include: setting a first neurology for the first PRB group among the plurality of neurology to the first terminal; And setting, to the first terminal, a second neuron for the second PRB group among the plurality of neurolologies.

The PRB groups configured for the first terminal may be plural, and the plurality of PRB groups may include a first PRB group and a second PRB group scheduled to the first terminal through the same downlink control information (DCI). .

When the same neuralology is applied to the first PRB group and the second PRB group, an index given to the last PRB among a plurality of PRBs included in the first PRB group is included in the second PRB group. It may be the same as the index given to the last PRB of the plurality of PRBs.

When the same neuralology is applied to the first PRB group and the second PRB group, the indexes assigned to the plurality of PRBs included in the second PRB group are a plurality of PRBs included in the first PRB group. Of which may be based on the index given to the last PRB.

The scheduling method of the base station may further include transmitting a PRB bundle index indicating a PRB bundle including the at least one PRB to the first terminal through downlink control information (DCI).

The number of PRBs included in the PRB group set to the first terminal may be determined according to the neuralology applied to the PRB group set to the first terminal.

The scheduling method of the base station may include setting a PRB group different from the PRB group configured for the first terminal to the second terminal; And setting a numerology different from a neuralology for the PRB group set in the first terminal among the plurality of neuralology in the second terminal for the PRB group configured in the second terminal. have.

The plurality of numerologies may include a first neuralology and a second neuralology.

The number of PRBs included in the first PRB group to which the first neuralology is applied may be equal to the number of PRBs included in the second PRB group to which the second neuralology is applied.

In addition, according to another embodiment of the present invention, a transmission method of a base station comprises the steps of: generating a first downlink synchronization signal used for initial access; And transmitting the first downlink synchronization signal.

The first sequence set for the first downlink synchronization signal may be different from the second sequence set for the second downlink synchronization signal used for a different purpose than the initial connection.

The generating of the first downlink synchronization signal may include generating the first downlink synchronization signal using a second polynomial different from a first polynomial for the second downlink synchronization signal. have.

The generating of the first downlink synchronization signal may be performed using a polynomial equal to the polynomial for the second downlink synchronization signal and a cyclic shift value different from a cyclic shift value for the second downlink synchronization signal. And generating the first downlink synchronization signal.

The transmission method of the base station further includes the step of transmitting the second downlink synchronization signal through a first one of a plurality of numerologies defined by subcarrier spacing and a cyclic prefix length. can do.

The transmitting of the first downlink synchronization signal may include transmitting the first downlink synchronization signal through the first neural mechanism.

The transmitting of the first downlink synchronization signal may include transmitting the first downlink synchronization signal through a second neurology that is different from the first one of the plurality of numerologies. .

According to an embodiment of the present invention, a method and apparatus for supporting or performing flexible transmission and reception through various neural mechanisms may be provided.

In addition, according to an embodiment of the present invention, a method and apparatus for supporting or performing flexible resource allocation (or scheduling) in a next generation communication system may be provided.

1A, 1B, 1C, 1D, 1E, 1F, and 1G are diagrams illustrating methods of supporting terminals having heterogeneous capability in the same frequency domain according to an embodiment of the present invention. It is a figure which shows.

2A, 2B, 2C, 2D, and 2E are diagrams showing FRB definitions for NR carriers according to an embodiment of the present invention.

3 is a diagram illustrating an NR carrier configuration based on basic neuralology according to an embodiment of the present invention.

4 is a diagram illustrating coexistence of basic and subneuronal.

5A, 5B, and 5C illustrate a method of constructing an anchor FRB, in accordance with an embodiment of the present invention.

6 illustrates a subcarrier grid based on method A110, in accordance with an embodiment of the present invention.

7A and 7B illustrate a subcarrier grid based on method A111, in accordance with an embodiment of the present invention.

8A and 8B illustrate a DC subcarrier arrangement based on Method A121 and Method A122, in accordance with an embodiment of the present invention.

9A and 9B illustrate a PRB definition based on method A130, in accordance with an embodiment of the present invention.

10 illustrates a PRB definition based on method A132, according to an embodiment of the present invention.

11 is a diagram illustrating coexistence with LTE NB-IoT when the number of PRBs of NR carriers is even according to an embodiment of the present invention.

12A and 12B illustrate a PRB configuration based on method A133, according to an embodiment of the present invention.

FIG. 13 is a diagram showing how a PRB is configured based on method A133 for each of a plurality of neurolages according to an embodiment of the present invention.

14 is a diagram illustrating a method of transmitting a plurality of DC subcarriers based on method A133 according to an embodiment of the present invention.

FIG. 15 is a diagram illustrating PRB numbering for each neurolage according to an embodiment of the present invention. FIG.

FIG. 16 is a diagram illustrating PRB numbering for each neurolage according to another embodiment of the present invention. FIG.

17A and 17B are diagrams illustrating a method for setting a PRB group in a terminal according to an embodiment of the present invention.

18 illustrates full-band PRB numbering, according to an embodiment of the invention.

19A, 19B, and 19C are diagrams illustrating a method of setting a neutralizer and a guard band based on the method A140 or the method A142 according to an embodiment of the present invention.

20A and 20B illustrate a FRB configuration, a neuralology setting, and a guard band setting based on method A100 according to an embodiment of the present invention.

21 is a diagram illustrating a PDCCH block arrangement according to an embodiment of the present invention.

22 is a diagram illustrating a relationship between a PDCCH block and a data region according to an embodiment of the present invention.

FIG. 23 is a diagram illustrating a PDCCH block arrangement according to another embodiment of the present invention. FIG.

24 is a diagram of 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 (e.g. gNB), access point, radio access station, base transceiver station, mobile multihop relay (MMR) 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, and a home node B (HNB) May also refer to a home eNB (HeNB), a pico base station, a micro base station, an advanced base station, HR-BS, NodeB, eNB, gNB, access point, radio access station, transmit / receive base station, MMR-BS, repeater, High reliability repeater, repeater, macro base station, small base station, femto base station, HNB, HeNB, pico base station, micro base station It may also include all or part of the function.

Hereinafter, a method and apparatus for supporting flexible resource allocation in a wireless communication system will be described. Specifically, a method and apparatus for transmitting a signal through a plurality of numerology in one carrier will be described.

In a system in which cyclic prefix (CP) based OFDM is used (e.g., NR system), the numerology is basically defined by the subcarrier spacing and the CP length. In this specification, the time domain symbol may be an OFDM symbol. However, this is only an example and an embodiment of the present invention may be applied even when the time domain symbol is a symbol different from the OFDM symbol.

Table 1 shows an example of a variable neuronal configuration for an OFDM system.

Specifically, in Table 1, a case in which a total of five neuronals are defined is illustrated. The subcarrier spacings of Pneumonia A to Pneumonia E are 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz, respectively. The OFDM symbol length decreases in inverse proportion to the subcarrier spacing, from numerology A to numerology E. CP overhead is the same at about 6.7% for all neurology. Therefore, the CP length is defined in proportion to the OFDM symbol length.

The establishment of a relationship of two powers of each other between the subcarrier spacings of Numerology A to Numerology E is suitable for lowering the complexity of the NR system implementation or efficiently operating a plurality of heterologous neural mechanisms. Suitable for support Numerology A in Table 1 is the same as that used for unicast transmission of LTE. Thus, when Neumerology A is used, it may be advantageous to coexist with LTE carriers on the same frequency band.

	Neuerlodge A	Neuerlodge B	Neuerlodge C	Neuerlodge D	Neuerlodge E
Subcarrier spacing	15 kHz	30 kHz	60 kHz	120 kHz	240 kHz
Number of OFDM Symbols in 1ms	14	28	56	112	224
CP length	4.76us	2.38us	1.19us	0.60us	0.30us

One neuron may basically be used for one cell (or carrier) and may be used for a particular time-frequency resource within one carrier. Heterogeneous neurons may be used for different operating frequency bands or may be used to support different types of services within the same frequency band and / or within the same carrier. As an example of the latter, Numerology A in Table 1 will be used for enhanced mobile broadband (eMBB) services in the sub-6 GHz band, and Numerology C will be used for ultra-reliable low latency communication (URLLC) services in the sub-6 GHz band. Can be. On the other hand, in order to support MMSTC or multimedia broadcast multicast services (MBMS) services, a numerology having a subcarrier spacing smaller than the subcarrier spacing of the basic neuralology may be used. To this end, in the case where the subcarrier spacing of the basic neutralizer is 15 kHz, a subcarrier spacing of 7.5 kHz or 3.75 kHz may be considered.

Hereinafter, a method and apparatus for supporting flexible resource allocation in a wireless communication system will be described. In the following, a method and apparatus for transmitting a signal through a plurality of numerologies in one carrier will be described. In the present specification, for convenience of description, the present invention will be described using an NR-based wireless communication system as an example. However, this is only an example and the present invention is not limited thereto and may be applied to various wireless communication systems. Also, in this specification, some terms, some units, and some concepts of the LTE system may be equally applied to the NR system. For example, a minimum resource allocation unit of an NR system is a resource element (RE), and one resource element corresponds to one OFDM symbol on a time axis and one subcarrier on a frequency axis. For another example, the subframe length and radio frame length of the NR system may be 1 ms and 10 ms, respectively, as in the case of the LTE system. Meanwhile, in the LTE system, a physical resource block (PRB) refers to a two-dimensional resource allocation unit including 14 time domain symbols and 12 subcarriers in the case of a 15 kHz subcarrier interval. However, the PRB is used herein as a frequency axis resource allocation unit irrelevant to the time axis. The construction of the PRB will be described later in detail.

Slots may be defined as time-axis scheduling units for uplink and downlink data in the NR system. The length of the slot may be defined as an integer number of consecutive OFDM symbols, apart from the subframe length. In addition, in the NR system, a minislot may be defined as a minimum scheduling unit having a length shorter than the slot length. For example, minislots may be used for time division multiplexing (TDM) in 6 GHz and above bands, partial slot transmissions in unlicensed bands or coexistence bands with LTE, URLLC transmissions requiring low latency, and the like. . To support these various uses, the length of the minislot and the starting position of the minislot can be defined as flexibly as possible. For example, assuming that the number of OFDM symbols per slot is M, the number of OFDM symbols per minislot can be configured within the range of 1 to (M-1), and the minislot-based transmission start point is in the slot. It can be defined to be any OFDM symbol.

In the case of downlink, a slot may be composed of one physical downlink control channel (PDCCH) region and a data region, similar to a subframe of the LTE system. In the PDCCH region and the data region, signals may or may not be transmitted. The PDCCH region and the data region are generally divided into different time resources (and / or different frequency resources).

In the present specification, for convenience of description, the NR signals and the NR channels are divided into a first signal set and a second signal set. The first signal set includes a signal and a channel mainly used by the base station or the terminal to obtain initial synchronization of uplink (UL) and downlink (DL), and the second signal set includes other signals and It includes a channel. For example, the first signal set may include a downlink synchronization signal, a physical broadcast channel (PBCH), and / or a beam reference signal (BRS) in the case of downlink, and the first signal set may be uplink. It may include a physical random access channel (PRACH). The first signal set may be used for other purposes than uplink and downlink synchronization acquisition. For example, the downlink synchronization signal may be used for time and frequency synchronization tracking or radio resource management (RRM) measurement of a terminal in a radio resource control (RRC) connected state (eg, a terminal in an RRC CONNECTED mode). . In some cases, the second signal set may be classified into a 2-1 signal set and a 2-2 signal set. The 2-1 signal set is a set of signals and channels common to several terminals, and the 2-2 signal set is a set of signals and channels that are UE-specific (eg, UE-specific). For example, the 2-1 signal set may include a common search space of the PDCCH, a physical downlink shared channel (PDSCH) including broadcast information (eg, system information), and the like. . In addition, hereinafter, transmitting the first signal set and the second signal set means transmitting all or part of the signals and channels included in the set.

In LTE systems, all terminals except low cost terminals (e.g., bandwidth-reduced low-complexity (BL) / coverage enhanced (UE) UEs) commonly support a sampling rate of up to 30.72 MHz, and the maximum system bandwidth per carrier (e.g., 20MHz) and up to 2048 fast Fourier transform / FFT (inverse FFT) are supported. However, since the NR system supports a plurality of numerologies, the capability of the terminal may be segmented. The capability of the NR terminal may be defined based on the maximum sampling rate. For example, the capability of a terminal supporting a maximum bandwidth of 40 MHz, 160 MHz, and 640 MHz (BW) may be defined as a maximum sampling rate of 61.44 MHz, 4 * 61.44MHz, and 16 * 61.44MHz, respectively. In this case, the terminal may perform transmission using various combinations of subcarrier spacing and FFT / IFFT size within a range not exceeding the sampling rate.

Alternatively, the capability of the NR terminal may be defined based on a set of numerology supported by the terminal. For example, there may be a terminal that supports all the neural mechanisms of the NR system and a terminal that supports only some of the neural rollers. The capability of a terminal that supports only some of the neurons may be further subdivided according to the neural cluster set. In this case, the terminal may be defined to support the same neuron set for transmission of the first signal set and the second signal set.

Alternatively, the capabilities of the NR terminal may be distinguished according to whether the terminal can simultaneously transmit and receive data using a plurality of numerologies. For example, there may be a terminal that is not capable of transmitting (or receiving) simultaneously with a terminal capable of simultaneously transmitting (and / or receiving) a plurality of second signal sets to which different neuronologies are applied. The capability of a terminal that can simultaneously transmit (and / or receive) a plurality of second signal sets to which different numerologies are applied in one NR carrier supports carrier aggregation to which different numerologies are applied. It may be similar to the capability of the terminal. In addition, there may be a terminal capable of simultaneously transmitting (and / or receiving) a first signal set and a second signal set to which different neuronals are applied, and a terminal that cannot simultaneously transmit (and / or receive). The terminal may transmit the capability information to the base station. The capability of the low cost terminal for the mMTC service may be defined separately from the above-described capabilities.

Meanwhile, a terminal supporting URLLC may be classified into a terminal requiring both an eMBB service and a URLLC service and a terminal requiring only a URLLC service. An example of the former may be a terminal supporting tactile Internet services (eg, virtual reality (VR), augmented reality (AR), gaming, e-learning, etc.), and the latter example may be a factory automation robot or a surgical robot. The terminal may be mounted.

For another example, in the case of a terminal mounted in an autonomous vehicle, a URLLC service is basically required, and in the case of a terminal to provide in-vehicle multimedia service, a URLLC service and an eMBB service may be simultaneously required. In this case, a category or capability for the URLLC-only terminal may be defined separately. Alternatively, the URLLC-dedicated terminal is not explicitly distinguished from the eMBB terminal and may be defined by the above-described capability classification method. For example, the URLLC-dedicated terminal may support a small system bandwidth or support a small number of numerologies. Alternatively, the URLLC-dedicated terminal may not support a function of simultaneously transmitting (and / or receiving) a plurality of neuronals.

[ Neuerlodge  type]

Within one NR carrier, two neuronal types can be defined. One is primary primary and the other is secondary primary. Primary and secondary neutrals are defined from a terminal point of view and may differ from terminal to terminal. This is similar to the concept that a primary cell and a secondary cell are defined as UE specific (eg, UE-specific) in an LTE system. The primary neuron is a newer used when an UE not in an RRC connection state (eg, an RRC_IDLE state) initially accesses an NR carrier, or is configured as a primary neuron from a base station during initial access. It may be neurolology. Alternatively, the primary neuron may be a neuron, in which a terminal in an RRC connected state (eg, a terminal in an RRC_CONNECTED state) is set as a primary neuron in a corresponding carrier from a base station. Alternatively, the primary neuron may be a neuron used by the terminal to perform a specific function in addition to the initial access. For example, at least primary neuron may be used for synchronization tracking of a UE in an RRC connected state, RRM (radio resource management) measurement, PDCCH monitoring, and / or system information block (SIB) reception. The uplink primary neuron and the downlink primary neuron may be distinguished from each other. For example, the UE may regard the neuron used to receive the downlink synchronization signal and the PBCH as the downlink primary neuron, and receive the uplink primary neuron from the base station. Alternatively, in the case of downlink only, primary neuron may be defined. Among the numerologies configured in the terminal, the remaining neurology except the primary neurology may be defined as the secondary neuralology.

[ NR carrier  type]

The carrier of the LTE system has a unique cell identifier (ID) for each carrier and is identically defined or configured for all terminals except the low cost terminal. That is, the parameters or components (eg, system bandwidth, center frequency, neuronology, PRB configuration, etc.) defining the carrier are equally applied to the terminals. On the other hand, in the NR system, one carrier can support a plurality of neurolage. In this case, the NR carrier may be designed into two types (eg, a first type NR carrier and a second type NR carrier).

The first type NR carrier is a type in which the structure and operation of a standalone NR carrier are defined by one representative neuronology, and another neuronology may be additionally set in some or all resource regions. At this time, with only the additionally-set new rollers, the first type NR carrier cannot operate as an independent carrier. Hereinafter, in the first type NR carrier, the representative neuron is referred to as a base neuron, and the neuron, which may be further set, is referred to as a sub-neutral. For example, the basic neutralizer may be a neutralizer applied to a downlink synchronization signal used for initial access.

Primary and secondary neutrals are classifications from the terminal perspective, while primary and subneuronal are classifications from the cell perspective (or system perspective). In the case of the first type NR carrier, the UE in the RRC_IDLE state that wants to initially access the NR carrier should at least support the basic neuronology of the NR carrier. In addition, in the case of the first type NR carrier, all terminals in the RRC_CONNECTED state can use the basic neuron as the primary neuron.

The second type NR carrier is a type that enables independent carrier operation for each numerology when the NR carrier consists of a plurality of numerologies. Alternatively, even when the NR carrier consists of a single neuron, the partial frequency region (s) of the carrier may constitute independent carrier (s). In the following description, an independent carrier which is formed on a per-neutral basis (or for a partial frequency domain) is called a self-carrier to distinguish it from a second type NR carrier. That is, one second type NR carrier may include one or a plurality of self-carriers, and each self-carrier may perform a standalone carrier operation. For example, if the NR carrier consists of a first and second neuron, the NR carrier acts as an independent NR carrier (e.g., first self-carrier) only in the portion where it is used. It is possible to operate as an independent NR carrier (e.g., a second self-carrier) only in the portion where the second pneumonology is used. If the NR carrier is a carrier that supports initial access, the terminal may initially connect to the NR carrier using one of the first and second neuronologies. In addition, the terminal may perform transmission with the NR carrier by using one of the first and second neuron as the primary neuron. That is, within the second type NR carrier, the primary neuron may be set differently for each terminal.

Within one NR carrier, the characteristics of the first type NR carrier and the second type NR carrier may be applied simultaneously. For example, where the NR carrier consists of a first, second, and third neurology, the first and second neurology each support their own independent carrier operation. In addition, it may be impossible for the NR carrier to operate as an independent carrier with only the third neutral roller. In this case, the first and second neurolage may be used as the primary or secondary neutral, and the third, may be used only as the secondary. The present invention contemplates both a first type NR carrier, a second type NR carrier, and a carrier having a mixed type of two types.

1A, 1B, 1C, 1D, 1E, 1F, and 1G illustrate a method of supporting terminals having heterogeneous nuclear capability in the same frequency domain according to an embodiment of the present invention. to be. Specifically, FIGS. 1A to 1G illustrate methods for supporting a plurality of terminals having different neuronal capacity in the same frequency domain. In FIGS. 1A-1G, UE UE A supports only a first neuron roller, UE B supports only a second neuron roller, and UE UE C supports a first neural roller and a first one. Assume that 2 numerology is supported. For example, the first neural roller may have a subcarrier spacing of 15 kHz, and the second neural roller may have a subcarrier spacing of 60 kHz. For example, UE A is a terminal supporting only eMBB service, UE B is a terminal supporting only URLLC service, and UE C is a terminal supporting both eMBB service and URLLC service. have.

1A to 1D and FIG. 1G illustrate a method in which a UE UE A and a UE B are supported by different NR carriers. As illustrated in FIGS. 1A-1D and 1G, UE UE A is connected to a first carrier to perform transmission through a first neuralology, and UE B is connected to a second carrier. The transmission is performed through the second neural mechanism. Specifically, FIGS. 1A to 1D illustrate a case in which the frequency domain of the second carrier is included in the frequency domain of the first carrier, wherein the overlapping frequency domain is used for transmission of the first carrier and the second carrier. Both can be used. This is different from the LTE system. Transmission of the first carrier and the second carrier in the overlapping frequency domain may be performed by a method such as frequency division multiplexing (FDM), time division multiplexing (TDM), code division multiplexing (CDM), or spatial division multiplexing (SDM). Can be multiplexed. That is, signals of the UE UE A and the UE B in the overlapping frequency domain may be transmitted through the multiplexing methods listed above.

1A and 1C illustrate a case where some frequency domains of the first carrier overlap with the second carrier, and FIGS. 1B and 1D illustrate a case where the frequency domain of the first carrier and the frequency domain of the second carrier are the same. It is.

On the other hand, as a method of supporting the first UE and the second neuronology to the UE UE, a method of aggregation of the first carrier and the second carrier (eg, FIGS. 1A and 1B) and one carrier (eg In this example, a method (eg, FIG. 1C and FIG. 1D) of supporting both the first and second neural mechanisms (eg, supporting mixed numerology) in the first carrier may be used. The former method (e.g., Figures 1A, 1B) has the advantage of simplicity in design since multiple numerology does not have to be used in one carrier. However, since the UE must perform operations such as synchronization acquisition and RRM measurement for each carrier, the former method (eg, FIG. 1A and FIG. 1B) has a higher complexity than the latter method (eg, FIG. 1C and FIG. 1D). Has In the case where the latter method (eg, FIG. 1C, FIG. 1D) is used, a specific frequency region may be set as the first carrier for the UE UE C and as the second carrier for the UE UE B.

FIG. 1G illustrates a case where the frequency domain of the second carrier is not included in the frequency domain of the first carrier. That is, the method illustrated in FIG. 1G does not support the UE B in the frequency domain of the first carrier. In this case, the first carrier may be a first type NR carrier using the first neuron as a basic neurolage. Since the UE UE A and the UE C support the first neuronology, they may be connected to the first carrier. However, since the UE UE supports only the second neural roller, it is impossible for the UE UE B to transmit on only the first carrier. The base station additionally sets the second neuronology in the first carrier (i.e., sets the second neuronology as the sub-neurology), thereby transmitting the first and second neuronologies for transmission with the UE UE C. You can use all of them (eg use mixed numerology).

The method illustrated in FIGS. 1E and 1F is a method in which a UE UE A and a UE B are supported by the same carrier (eg, a first carrier). This may correspond to the case where the first carrier is a second type NR carrier. That is, the UE UE A is connected to the first carrier to perform transmission using only the first neuron roller, and the UE UE B is connected to the first carrier to perform transmission using only the second neutral roller. do. The primary neuron of the terminal UE A and the UE B is a first neuron and a second neuron, respectively. In this case, FIG. 1E illustrates a case where the frequency domain of the first neuron belonging to the first carrier is different from the frequency domain of the second neuron belonging to the first carrier. Specifically, FIG. 1E illustrates a case in which the entire frequency domain of the NR carrier and the frequency domain for each neuron may be different. In FIG. 1F, the case where the frequency domain of the first neuron and the frequency domain of the second neurolage is the same is illustrated.

Meanwhile, in the case of FIGS. 1C and 1D, in order for the first carrier and the second carrier to coexist efficiently in the overlapping frequency region, the second neuronal signal region of the first carrier and the second carrier are included in each other. It can have That is, the commonly defined second neuronal signal region may be set in the first carrier for the UE UE C and set as the second carrier for the UE UE B. To this end, the first carrier may be a second type NR carrier. That is, when each of the first and second neuronal signal regions of the first carrier operates as an independent carrier, the second neuronal signal region of the first carrier is the UE (UE C). May be set in the first carrier and as a second carrier in the UE B. In this case, a criterion for identifying a carrier may be a cell identifier (ID). In this case, the method illustrated in FIGS. 1C and 1D may be indistinguishable from the method illustrated in FIGS. 1E and 1F in terms of physical layer.

[ FRB ]

In order to use multiple numerologies within one NR carrier, the system bandwidth (or available bandwidth except the guard band at both ends of the system bandwidth) is divided into a plurality of frequency resource blocks (FRBs). Can be. Hereinafter, the method of defining the FRB such that the sum of the FRBs is the system bandwidth is called 'Method A100', and the sum of the FRBs is the effective bandwidth (i.e., the OFDM subcarrier transmission region excluding the guard band at both ends of the system bandwidth). The method of defining the FRB to be the transmission area) is called 'Method A101'. It can be defined that there is no intersection between FRBs.

The FRB by method A101 is by definition similar to the subband of an LTE system. However, since the subband of the LTE system is a frequency bundle for channel state information (CSI) related operation, the FRB can be distinguished from the subband. For example, a plurality of subbands may be defined within one FRB.

2A, 2B, 2C, 2D, and 2E are diagrams showing FRB definitions for NR carriers according to an embodiment of the present invention.

Method A100 is illustrated in FIG. 2A and method A101 is illustrated in FIGS. 2B-2E.

As illustrated in FIGS. 2A and 2B, all FRBs may have the same bandwidth (eg, Δf _FRB ). Alternatively, as illustrated in FIGS. 2C-2E, all FRBs have the same bandwidth, but the bandwidth of the first and / or last FRBs present at both ends of the system bandwidth is equal to the bandwidth of each of the remaining FRBs (eg, Δf _FRB). May be less than). Or conversely, all FRBs have the same bandwidth, but the bandwidth of the first FRB and / or the last FRB may be greater than the bandwidth of each of the remaining FRBs (eg, Δf _FRB ).

In FIG. 2C, similar to the subband configuration of the LTE system, the FRBs are sequentially allocated from the effective bandwidth edge, so that the last FRB of the opposite edge includes fewer subcarriers than each of the other FRBs. .

2D and 2E illustrate the case where the FRBs are sequentially allocated from the center of the available bandwidth so that the FRBs are symmetrical with respect to the center frequency. In detail, FIGS. 2D and 2E illustrate examples in which FRBs present at both edges of the effective bandwidth include fewer subcarriers than each other FRB. In FIG. 2D, there is an odd number of FRBs and there is an unpaired FRB (eg, a center FRB) in the center of the system bandwidth. In FIG. 2E, the number of FRBs is even and all FRBs are paired based on the center frequency. 2E illustrates a case where one direct current (DC) subcarrier exists in the center of the system bandwidth and the DC subcarriers are not included in the configuration of the FRB. However, the embodiment of FIG. 2E is merely illustrative. In general, the location of the DC subcarrier may not be the center of the system bandwidth, or the FRB may be defined so that the DC subcarrier is included in a specific FRB.

If method A100 is used, the bandwidth of the FRB may be a divisor of the system bandwidth. For example, if the system bandwidth is 20 MHz, the NR carrier may consist of four FRBs having a bandwidth of 5 MHz. In the case where the FRB is used as the basic unit of frequency axis of the numerology configuration as described below, the method A100 may be applied to the second type NR carrier so that the plurality of numerologies may have different system bandwidths. For example, when the second type NR carrier has a total system bandwidth of 20 MHz, the system bandwidth of the first neuron and the system bandwidth of the second neuron may be set to 20 MHz and 10 MHz, respectively. In this case, if there are four FRBs having a bandwidth of 5 MHz, the frequency domain of the second neuron may be allocated through two consecutive FRBs. A terminal using the first neuron as the primary neuron may be configured with two consecutive FRBs for the frequency domain of the second neuron as the secondary neutral or blank resource.

On the other hand, when the method A101 is used, the bandwidth of the FRB may be an integer multiple of the PRB bandwidth. This is referred to as 'method A102'. Alternatively, the bandwidth of the FRB may be an exponential multiplier of two of the PRB bandwidth. This is referred to as 'method A103'.

As an example of method A103, each FRB may consist of 16 PRBs. At this time, if one PRB consists of 12 subcarriers as in the LTE system, one FRB includes 192 subcarriers (= 16 * 12).

If the number of PRBs per FRB is defined as P in Method A102 and Method A103, it may be difficult for each FRB to have P PRBs each. If the number of PRBs is not divisible by P or less than P, some or all of the FRBs may consist of fewer PRBs. For example, assume that there are 26 PRBs in the system bandwidth of 5 MHz and P = 16 by method A103. At this time, if three FRBs are defined according to the principle of FIG. 1D, the first FRB, the second FRB, and the third FRB may be composed of five, sixteen, and five PRBs, respectively. Alternatively, if two FRBs are defined according to the principle of FIG. 1E, the first FRB and the second FRB may each consist of 13 PRBs. On the other hand, when the system bandwidth is small as in the above example, it may be inefficient to use the frequency resources are divided into several FRBs. Thus, in the case where the system bandwidth of the NR carrier is smaller than a certain value, exceptionally, a method in which the FRB is not defined or one FRB occupies the entire band may be considered. The specific value of the bandwidth may be different for each of the numerology.

On the other hand, when the method A100 is used, since the boundaries of the PRBs are generally not aligned with the boundaries of the FRBs, the number of PRBs may vary for each FRB and the guard band size may also vary. This may reduce the frequency resource utilization efficiency or increase the signaling overhead.

On the other hand, when Method A102 and Method A103 are used, since the PRB boundary is aligned with the FRB boundary, the number of PRBs can be defined as evenly as possible per FRB and / or the size of the guard band as evenly as possible per FRB. Can be. For the first type NR carrier, method A100 may be used for the FRB definition and methods A101 to A103 may be used. To utilize the advantages described above, methods A101 to A103 can be used for FRB definition.

[First type NR carrier ]

In the first type NR carrier, the basic neuron may be defined as a numerology that can be commonly used by all terminals regardless of the RRC connection state in the NR carrier. In other words, a particular signal or a specific channel in the NR carrier can be transmitted by at least the basic neurology. The terminal may receive and / or transmit a specific signal (or channel) by using the default neuron as a primary neuron by default even when no terminal configuration information is received from the base station. For example, in the first type NR carrier, there may always be a first signal set (first signal set for downlink) transmitted by the basic neuralology. A UE that is not in an RRC connected state may camp or attempt initial access to a specific cell using the first signal set (first signal set for downlink). In addition, in the first type NR carrier, there may always be a 2-1 signal set transmitted by the basic neuronology. Alternatively, the basic neuralology may be defined as a neuralology used to transmit a portion of the 2-1 signal set regardless of the first signal set. In this case, the UE that is not in the RRC connection state may not know what the basic neuronology of the cell (or carrier) is. For example, the terminal in the RRC connected state may periodically monitor the PDCCH using the basic neuron on the activated (NR) carrier when no separate neurology is set. When the neuralology of the first signal set and the neuralology of the 2-1 signal set (eg, the PDCCH) are different, the terminal receives the 2-1 signal set in the process of receiving the first signal set for initial access. (Eg, the PDCCH) may be obtained a neuronology. Only one neuron in one NR carrier can be used as the primary neuron.

The neuralology used as the basic neuralology for each frequency band may be predefined. For example, in the band below 3 GHz, subcarrier spacing of 15 kHz is used as the basic neuralology, and in the 3-6 GHz band, the subcarrier spacing of 30 kHz is used as the basic numerology, and in the band above 6 GHz, the subcarrier spacing of 120 kHz is used as the basic numerology. Can be. According to this method, since the UE attempts cell search through a predetermined neuralology for each frequency band, complexity for cell search and initial access can be reduced. On the other hand, there is no restriction on the neuralology that can be used as the basic neuralology and a method of allowing the base station to arbitrarily select it can be used. For example, in the band below 6 GHz, a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz may be used as the basic neutralizer. According to this method, the flexibility of the specification can be improved because the operator can select the basic neuralology according to the operation scenario, but the complexity increases because the terminal must attempt to receive a synchronization signal through a plurality of neuralology in the initial cell search. .

The UE that is not in the RRC connected state can find out the basic neuron registry in the initial access step to the carrier. For example, the terminal can find out the basic neuron registry by receiving the downlink synchronization signal. When the synchronization signal is transmitted only through the basic neurology, the terminal may attempt to detect the synchronization signal with respect to the plurality of neurology and may regard the neurology that has successfully received the synchronization signal as the basic neurology.

On the other hand, in a case where a synchronization signal is transmitted through several neuronologies in one NR carrier, various methods may be considered as a method for the UE to acquire a basic neuralology. For example, the base station may transmit basic neural information on the first signal set (eg, synchronization signal or PBCH). Loading basic basic information on the first signal set includes all methods of obtaining basic basic information by receiving a first set of signals. For example, the mapping (or sequence) for the downlink sync signal of the basic neurolage may be defined differently from the mapping (or the sequence) for the downlink sync signal of the basic neurolother and another neurolage.

In this specification, signaling that a base station can use to transmit control information to a UE includes physical layer signaling (eg, control information of a physical layer control channel), medium access control (MAC) signaling (eg, MAC protocol data) control information in the form of a unit), or control information in the form of a MAC header), RRC signaling (eg, an RRC control message, or a control parameter in the form of an information element) may be considered. In general, higher layer signaling includes MAC signaling and RRC signaling. In particular, when control signaling through physical layer signaling or MAC signaling is configured together with scheduling information for a corresponding UE or transmitted simultaneously, dynamic resource utilization is possible. Alternatively, a method of informing configuration information using RRC signaling and dynamically controlling configuration information set by RRC through physical layer signaling or MAC signaling may be used.

The system bandwidth of the first type NR carrier may be determined by the basic neuronology. Alternatively, candidate values for the system bandwidth of the NR carrier may be determined by the basic neuronology. For example, if the system bandwidth supported by Neumerology A is 5, 10, 20, and 40 MHz, then the system bandwidth of the NR carrier using Numerology A as the primary neutral will be 5, 10, 20 , And 40 MHz. If numerology A is used in a system bandwidth wider than 40 MHz, the neuralology supporting the wider system bandwidth can be used as the primary neuralology and the neuralology A can be used as the sub-neutralology. FRBs can also be defined by basic neurology. This is illustrated in FIG. 3.

3 is a diagram illustrating an NR carrier configuration based on basic neuralology according to an embodiment of the present invention.

Specifically, FIG. 3 illustrates a case where the system bandwidth of the carrier is determined by the basic neuralology, and the system bandwidth (or effective bandwidth) is divided into four FRBs. At this time, for the definition of FRB, all of method A100 to method A103 may be used. For example, if numerology A is used as the primary neurolage and the PRBs of the primary neuron are composed of 12 subcarriers, each FRB is divided into 32 PRBs (i.e. 32 * 12 = 384 subcarriers) by method A103. It can be composed of).

On the other hand, the bandwidth of the FRB may have a fixed value irrespective of the basic neurology. For example, when the method A100 is used, the bandwidth of the FRB may always have a bandwidth of 5 MHz regardless of the basic neuronology.

On the other hand, the sub-neutrals may be set as secondary secondary to the terminal. The terminal may be configured with one or a plurality of secondary neuronologies in one NR carrier. The terminal may assume that the base station performs transmission and reception using the basic neurology as a default operation for the FRBs configured from the base station. Then, after that, the terminal can receive the secondary neuron for the particular FRB (s) by receiving the RRC message from the base station. For example, at the same time that the terminal is set the system bandwidth (or frequency domain) of the NR carrier, it may be assumed that the basic neuron is applied to the FRB (s) defined within the system bandwidth.

Alternatively, the terminal may not assume any default neuron for the remaining FRBs except for the FRB (s) to which the basic neuron is fixedly transmitted. In this case, the terminal may perform transmission using the corresponding neuralology only after receiving the neurology from the base station.

4 is a diagram illustrating coexistence of basic and subneuronal.

Specifically, FIG. 4 exemplifies a case in which the primary and the subneuronalities coexist in one NR carrier. In FIG. 4, the case where the system bandwidth (or effective bandwidth) is divided into four FRBs is illustrated.

The base unit of the frequency axis of the subneuronal setting may be FRB. At this time, the minimum unit of setting of all the numerology may be defined as one FRB. This method has the advantage that the numerology and resource region can be set using a common FRB grid irrespective of the subcarrier spacing of the numerology. Alternatively, the minimum unit may be defined differently for each numerology. For example, the set minimum unit may increase in proportion to the subcarrier spacing of the numerology. As an example, 1, 2, and 4 adjacent FRBs, respectively, may be defined as frequency axis setting minimum units with respect to N, A, N, and C in Table 1. Alternatively, the set minimum unit of the basic neurolage is one FRB, and the set minimum unit of the sub-neumerology (s) having a subcarrier spacing larger than the subcarrier spacing of the basic numerology may increase in proportion to the subcarrier spacing. According to this manner, regardless of the neuralology to be set, a constant number of PRBs can always be used as the minimum unit of frequency axis resource setting.

As illustrated in Figs. 2C to 2E, when a FRB having a bandwidth smaller than the bandwidth of a normal FRB is defined at the edge of the effective bandwidth, it may be applied by applying a new and different neurolage of the FRB adjacent to the edge FRB. Transmitting and receiving signals can degrade spectral efficiency. This may be more severe if the bandwidth of the edge FRB is very small (eg several PRBs). Therefore, constraints may be applied such that the edge FRB always has the same numerology as that of the adjacent FRB. Alternatively, the constraint may be applied only when the bandwidth of the FRB is smaller than a certain threshold.

The time axis basic unit of the subneuronal configuration may be a subframe or a slot. When the time axis basic unit of the NMR configuration is a slot, the length of the slot may be determined by the basic NMR. For example, in the case where the slot length of the neuronage A is 1 ms, the sub-neutralization of the NR carrier using the neuralology A as the basic neuralology may be set in units of 1 ms.

Alternatively, a unit smaller than the slot (eg, one or more OFDM symbols) may be the minimum unit of time axis setting. This method may be suitable for cases in which it is desired to support URLLC transmission through a TDM method between heterologous neuronals.

Alternatively, the plurality of slots may be the minimum unit of time axis setting. For example, the subneuronology is dynamically reset every Z slots (where Z is a natural number) and the reset may be valid for Z slots.

Multiple FRBs may be set to have the same subneuronal. In this case, the plurality of FRBs may be continuous or discontinuous on the frequency axis. The subneuronal may be set to semi-static or dynamic. RRC signaling may be used for semi-static configuration, and physical layer signaling or MAC signaling may be used for dynamic configuration. Different setting methods may be applied to an area where control information is transmitted and an area where data is transmitted. For example, the PDCCH region may be set based on the semi-static setting and the data region may be set based on the dynamic setting or based on the semi-static setting.

Some of the plurality of FRBs may be defined as anchor FRBs. An anchor FRB may be defined as an FRB that includes a particular time-frequency resource. Here, in a specific time-frequency resource, all terminals expect that basic neuralology is used for signal transmission. For example, a first set of signals (e.g., primary synchronization signal (PSS) / secondary synchronization signal (PSS), PBCH, and PBCH-DMRS) to which the basic neuralology is applied are periodically transmitted on a specific time-frequency resource of the anchor FRB. Can be. In addition, the PDCCH region using basic neuralology may appear periodically in the anchor FRB. In the case of uplink, a physical uplink control channel (PUCCH) region in which the basic neuralology is used may periodically appear in the anchor FRB. The downlink anchor FRB and the uplink anchor FRB are distinguished, and their frequency domains may be different from each other.

Within one carrier, the relative position of the anchor FRBs can be fixed. Alternatively, the terminal may find the location of the anchor FRB through a predefined relationship between the anchor FRB and a specific signal (or a specific channel). Alternatively, the location of the anchor FRB may be set by the base station. If the location of the anchor FRB is set by the base station, the location of the anchor FRB may be transmitted by the PBCH.

For forward compatibility, the smaller the number of anchor FRBs, the better. An anchor FRB may be defined as one or two in one NR carrier. In the case where the number of anchor FRBs and the frequency axis position of the anchor FRBs are designed, the boundary between the FRBs and the position of the first signal set (the first signal set for the downlink) can be considered.

5A, 5B, and 5C illustrate a method of constructing an anchor FRB, in accordance with an embodiment of the present invention. 5A and 5B illustrate the case where the system bandwidth (or effective bandwidth) is divided into four FRBs. In FIG. 5C, the case where the system bandwidth (or effective bandwidth) is divided into five FRBs is illustrated.

Specifically, FIG. 5A illustrates a case in which a FRB boundary is positioned at a center frequency of a carrier and a first signal set is periodically transmitted over two FRBs located at the center. In this case, two centrally located FRBs may be defined as anchor FRBs.

FIG. 5B illustrates a case where the FRB boundary is located at the center frequency and the first signal set is periodically transmitted only within one FRB. At this time, one FRB through which the first signal set is transmitted may be defined as an anchor FRB.

In FIG. 5C, as described above with reference to FIG. 2D, a case in which a central FRB that is not symmetrical with other FRBs is present at the center of the bandwidth is illustrated. In this case, when the first signal set is periodically transmitted from one FRB located in the center, one FRB located in the center may be defined as an anchor FRB.

In the above embodiments, the carrier may include both a wideband carrier (eg, 100 MHz system bandwidth) and a narrowband carrier (eg, 10 MHz system bandwidth). Also in the above embodiments, the carrier may be a self-carrier constituting the above-described second type NR carrier.

The FRB is used as a unit for dividing frequency resources, and may include all resource regions on the time axis.

On the other hand, one FRB may be defined as a limited frequency resource and a limited time resource. For example, one FRB may include one or a plurality of PRBs and slots corresponding to the numerology applied to the FRB. At this time, the length of the time axis of the FRB may be different for each neurolage, or may be common to all the neurolologies. For example, the time axis length of the FRB is defined as the length including X slots of the basic neuronology, and this value can be applied to all FRBs. Alternatively, the length of the time axis of the FRB may be defined as a fixed value (eg, 10 ms) regardless of the basic neurology. If the time axis length of the FRB is finite, the terminal may assume that no signal is transmitted outside the set time interval of the FRB. Alternatively, the terminal may assume that the basic neuron or the primary neuron is used outside the set time interval of the FRB. Alternatively, the UE may assume that a numerology previously set by RRC signaling is used outside the set time interval of the FRB.

It is conceivable how the basic neural roller only applies to the entire resource area of the anchor FRB. Alternatively, a method may be considered in which a basic neuralology is fixedly applied to only some time-frequency resource regions of the anchor FRB and a sub-neurology (ie, a secondary neuralology of the UE) is applied to the remaining resource regions. In the partial time-frequency resource region, a first signal set and / or a 2-1 signal set may be transmitted. In the case of a downlink anchor FRB, PSS / SSS, PBCH, and PBCH-DMRS may be transmitted in the partial time-frequency resource region. The latter method can be used to support wideband URLLC transmission over subneuronal. Alternatively, a method may be considered that allows only the basic neuron to be scheduled for the entire resource region of the anchor FRB and exceptionally allow some time resources to be punctured by packets of the sub-neumerology.

[Second type NR carrier ]

In the case of the first type NR carrier, the frequency domain may be defined by the basic neuralology. On the other hand, in the case of the second type NR carrier, a plurality of neurolages may each form a self-carrier in one NR carrier. In general, the entire frequency domain of the second type NR carrier may not coincide with the frequency domain of each self-carrier. The entire frequency domain of the second type NR carrier may be defined as the union of the frequency domains of the self-carriers. If there is no such restriction between the entire frequency domain and the frequency domain of the self-carriers, the distinction between the second type NR carrier and the self-carrier may be ambiguous.

Accordingly, even in the case of the second type NR carrier, the basic neuronology may be defined. The entire frequency domain of the second type NR carrier may coincide with the frequency domain of the basic neuronology. For example, the second type NR carrier may be composed of a first neuronology occupying a first frequency domain and a second neuronology occupying a second frequency domain. At this time, if the first neuralology is used as the basic neuralology, the entire frequency region of the second type NR carrier coincides with the first frequency region, and the second frequency region may be part of the first frequency region. According to this method, the role of the basic neuronology is the same as that of the first type NR carrier, and only the first type NR carrier and the primary type of NR carrier can be used as primary primary NR carriers. The second type NR carrier may be distinguished.

In the following description, for convenience of description, even in the case of the second type NR carrier, the other neurolage (s) different from the basic neurolage are referred to as sub-neutral. According to this, the above-described methods of configuring the FRB and the anchor FRB can be equally applied to the second type NR carrier. In the case of the second type NR carrier, the bandwidth of the FRB may have a fixed value regardless of the neuralology. For example, the method A100 is used for the construction of the FRB, and the bandwidth of the FRB may always be 5 MHz regardless of the neuralology. Also in the case of the second type NR carrier, an anchor FRB may be present for each self-carrier. Alternatively, the anchor FRB may be present for all of the neurology used at least as the primary neurology of the terminal, irrespective of the neuronal type.

In the case of the second type NR carrier, the first signal set and / or the 2-1 signal set are always transmitted for at least all of the neurology used as the primary neurology of the terminal, regardless of the neurology type. Can be. In the case where the first signal set and / or the 2-1 signal set are transmitted by a specific neuronology, the terminal using the specific neuralology as the secondary neuralology is configured to receive the signal set from the base station so as to receive the signal set. Know the existence of the signal set.

[ Subcarrier  grid]

Hereinafter, a set of consecutive OFDM subcarriers or frequency positions thereof is referred to as a 'subcarrier grid'. An OFDM subcarrier may be transmitted at a frequency corresponding to each grid point of a predefined subcarrier grid. In the case where a plurality of numerologies are used in one NR carrier, the subcarrier grid may be defined per numerology. If the subcarrier spacings of the numerologies differ from each other by an exponential multiplier of 2, the subcarrier grid scale of the numerology with the large subcarrier spacing may be aligned to the subcarrier grid scale of the numerology with the small subcarrier spacing. . That is, the former scale and the latter scale may have the same frequency value. This is illustrated in FIGS. 6, 8A, 8B, 9A, 9B, and 10 described later. Within the system bandwidth of the NR carrier (or the effective bandwidth excluding the guard band in the system bandwidth), one subcarrier grid per numerology may be defined or may be defined in multiple. OFDM modulation and demodulation may be performed for each subcarrier grid.

The method in which each neuron has one full-band subcarrier grid in the NR carrier is called 'method A110'. In FIG. 6, method A110 is illustrated.

6 illustrates a subcarrier grid based on method A110, in accordance with an embodiment of the present invention.

In detail, FIG. 6 illustrates a case in which the sub-neumerologies each having a subcarrier spacing that is twice as large as the subcarrier spacing (eg, Δf) of the base neuron and the base neuron have one full-band subcarrier grid. As illustrated in FIG. 6, the subcarrier grid scale of the sub-neutralology may be aligned with the subcarrier grid scale of the basic pneumonology.

Method A110 has the advantage that the UE can perform FFT / IFFT operation only once for each neuralology regardless of the configuration form of the neuralology. In the case where method A110 is used, the center frequency of the subcarrier grid for the numerology may be the same for all the numerology, and the bandwidth of the subcarrier grid for the numerology may be the same for all the neuralology. In the case where a DC subcarrier is defined for all numerologies, the position of the DC subcarrier may be the same for all the neural loci. Method A110 may be more suitable for the first type NR carrier.

On the other hand, the basic neutralizer may have one full-band subcarrier grid, and the sub-neutralizer may have one or a plurality of subband subcarrier grids. This is referred to as 'method A111'. Method A111 is illustrated in FIGS. 7A and 7B.

7A and 7B illustrate a subcarrier grid based on method A111, in accordance with an embodiment of the present invention.

In detail, FIG. 7A illustrates a case in which the sub-neumerology has a plurality of subband subcarrier grids, and FIG. 7B illustrates a case in which the sub-neurology has one subband subcarrier grid. 7A and 7B illustrate the case where the subcarrier spacing of the subneuronal is twice as large as the subcarrier spacing (eg, Δf) of the basic neuralology.

In the case where method A111 is used, the subcarrier grid of the subneuronology can be defined within each FRB. For example, when the NR carrier is composed of four FRBs, the subcarrier grid may be up to four subcarriers.

Alternatively, when method A111 is used, the size of the subcarrier grid of the subneuronology may be determined to be the smallest bandwidth that covers all of the frequency domains in which the subnumerology is set. One subband subcarrier grid for the subneuronology may include the entire band. When the subneuronology is set in units of FRBs on the frequency axis, the subcarrier grid of the subnumerology may be defined in a plurality of consecutive FRBs. This method may be more suitable for the second type NR carrier.

When method A111 is used, the subcarrier grids of the subnumerology can be designed such that the spacing between subcarriers belonging to different grids is an integer multiple of the basic subcarrier spacing for that numerology. Through this, interference between subcarrier grids may be eliminated.

Even when the method A111 is used, the subcarrier grid scale of the numerology having a large subcarrier spacing may be aligned with the subcarrier grid scale of the numerology having a small subcarrier spacing.

Meanwhile, a method of defining a DC subcarrier and using the DC subcarrier as a null subcarrier can reduce the complexity of implementing an OFDM receiver. In the LTE system, a DC subcarrier exists at a center frequency of a carrier in downlink, and a DC subcarrier does not exist in uplink. In the case of an NR carrier, the presence or absence of a DC subcarrier may be defined for each neuron type. This is referred to as 'Method A120'.

As a detailed method for method A120, method A121, method A122, and method A123 can be used.

Method A121 is a method in which a DC subcarrier is used for the transmission of the basic neuronology and a DC subcarrier is not used for the transmission of the subneuronal.

Method A122 is a method in which DC subcarriers are used for both basic and sub-neutral transmissions.

Method A123 is a method in which a DC subcarrier is not used for both basic and sub-neutral transmissions.

If a DC subcarrier for nulling is not defined in the specification, the terminal may implement noise in the vicinity of DC.

If a DC subcarrier for nulling is present in a certain numerology, the DC subcarrier may be defined for each subcarrier grid at the center frequency of the frequency domain occupied by each subcarrier grid belonging to the corresponding numerology. Or, the position of the DC subcarrier is not previously defined in the standard, the base station nulls any particular subcarrier, the null specific subcarrier may be used for the purpose of the DC subcarrier of the terminal.

8A and 8B illustrate Method A121 and Method A122.

8A and 8B illustrate a DC subcarrier arrangement based on Method A121 and Method A122, in accordance with an embodiment of the present invention.

Specifically, in FIGS. 8A and 8B, it is assumed that the method A110 is used and the basic and subneuronal have the same center frequency.

8A and 8B, one basic and three sub-neurologies (first sub-neurology, second sub-neurology, and third sub-neurology) are illustrated. The subcarrier spacing of the first sub-neutral is 0.5 times larger than the subcarrier spacing of the basic N-layer (eg, Δf), the subcarrier spacing of the second sub-neutralology is twice larger than the subcarrier spacing (eg, Δf) of the base-neutral The subcarrier spacing of the third sub-neutral is four times larger than the subcarrier spacing (eg, Δf) of the basic pneumonology.

In FIG. 8A, the method A121 exemplifies a case where the DC subcarrier exists only in the primary neuron and not in the subneuronaries. That is, the DC subcarrier is used only for transmission of the basic neurolography (that is, the transmission based on the basic neurolage representing the plurality of neurolologies).

In FIG. 8B, the method A122 illustrates the case where a DC subcarrier is present in both basic and sub-neutrals. That is, the DC subcarrier is used for the transmission of all the neurolologies (i.e., the transmissions based on all the neuralologies).

On the other hand, in the NR system, the DC subcarrier arrangement of the downlink and uplink may be the same. For example, in case of both downlink and uplink, method A121 may be used or method A122 may be used. If the method A121 or the method A122 is also applied to the uplink, one problem exists. In case of LTE uplink, there is no DC subcarrier. Accordingly, since the DC subcarriers are arranged in the NR uplink carrier, coexistence with an 'in-band narrowband (NB) -internet of things (IoT) carrier' may be difficult. On the other hand, since the DC subcarrier is also used for uplink transmission, when a low cost node other than the base station receives the uplink signal, the implementation complexity of the receiver may be lowered.

Meanwhile, DC subcarrier arrangement of downlink and uplink may be designed independently. For example, method A121 or method A122 may be applied to downlink, and method A123 may be applied to uplink. According to this, in the case of both uplink and downlink, it is easy for the NR carrier to coexist with the LTE NB-IoT carrier.

[ PRB ]

Hereinafter, the PRB configuration method on the frequency axis will be mainly described. Even in the case of an NR carrier, PRB may be defined as a set of M subcarriers (where M is a natural number) continuous on the frequency axis. There is no intersection between PRBs, and the sum of PRBs may include all valid subcarriers.

The PRB of the NR carrier may be defined for each neuron. Hereinafter, the PRB of the basic neurolage is referred to as a 'base PRB'. For example, if Numerology A in Table 1 is used as the primary neuralology, the primary PRB of the carrier consists of 12 subcarriers as in the case of the 15 kHz subcarrier spacing for the LTE system and has a bandwidth of 180 kHz Can have All basic PRBs can have the same number of subcarriers. To this end, the total number of subcarriers of each NR carrier may be an integer multiple of 'the number of subcarriers per basic PRB'.

Hereinafter, the PRB of the subneuronal is referred to as 'sub PRB'. The sub PRB may have the same bandwidth as the basic PRB. This is referred to as 'Method A130'. 9A and 9B, method A130 is illustrated.

9A and 9B illustrate a PRB definition based on method A130, in accordance with an embodiment of the present invention.

Specifically, in FIG. 9A and FIG. 9B, the case where the basic PRB consists of 12 subcarriers is illustrated. FIG. 9A illustrates a case where an even number of basic PRBs is present in one carrier, and FIG. 9B illustrates a case where there is an odd number of basic PRBs in one carrier. 9A and 9B, one basic and three sub-neurologies (first sub-neurology, second sub-neurology, third sub-neurology) are illustrated. 9A and 9B, the method A122 illustrates the case where a DC subcarrier is present in both basic and subneuronal.

Assuming that the subcarrier spacing of the basic pneumonology is Δf, the subcarrier spacing of the first sub-neutralology, the subcarrier spacing of the second sub-neuralology, and the subcarrier spacing of the third sub-neuralology are 0.5 * Δf, 2 * Δf, and 4 * Δf. Here, Δf may be 15 kHz.

By method A130, the sub PRBs have the same bandwidth as the base PRB. Accordingly, the PRBs (ie, the first sub-PRB, the second sub-PRB, and the third sub-PRB) of the first sub-neumerology, the second sub-neumerology, and the third sub-neurology are 24 and 6, respectively. , And three subcarriers. In addition, in Figs. 9A and 9B, a method is used in which the boundaries between PRBs are aligned with each other with respect to numerology.

In the case where there is an odd number of basic PRBs (i.e., there is one central PRB) as illustrated in FIG. 9B, the central PRB of the third subneuronal has only two effective subcarriers, not three.

On the other hand, assuming that a fourth subneuronology with a subcarrier spacing of 8 * Δf is added and the fourth subneuronology can be used for the same carrier, by method A130, the PRB of the fourth subneuronology (i.e. 4 sub-PRBs have arithmetically 1.5 subcarriers. As a result, it may be difficult to configure all sub-PRBs to have an integer number of subcarriers.

In order to solve this problem, when the basic PRB for the NR carrier is composed of 12 subcarriers, a method of limiting the maximum value of the subcarrier spacing for the subneuronal to 4 * Δf may be used. In other words, assuming that the basic PRB is composed of M subcarriers (where M is a natural number), and that the subcarrier spacing of the basic neurology and the subcarrier spacing of the subneumerology are Δf and N * Δf (where N is a natural number), respectively. For example, a method may be used in which N is a divisor of M by limiting the use of the neuralology. This method does not preclude the use of sub-neumerology with subcarrier spacing (e.g., 1 / N * Δf) that is less than the subcarrier spacing of the basic neuterology.

On the other hand, the PRB of the subneuronal may have a bandwidth different from that of the basic PRB. This is referred to as 'method A131'. In more detail, the PRB bandwidth may be defined to be proportional to the subcarrier spacing of the corresponding numerology. In other words, the 'number of subcarriers per PRB' may be defined to be the same for all the neurolage. This is called 'Method A132'. Method A132 is illustrated in FIG. 10.

10 illustrates a PRB definition based on method A132, according to an embodiment of the present invention.

Specifically, in FIG. 10, the same neurolage set as that of the nucleolar set illustrated in FIGS. 9A and 9B is considered. In FIG. 10, one basic neurology and three sub-neurologies (first sub-neurology, second sub-neurology, and third sub-neurology) are illustrated. In FIG. 10, the method A122 illustrates the case where a DC subcarrier is present in both basic and sub-neutrals.

As illustrated in FIG. 10, each of the basic PRBs and the PRBs of the first to third subneuronages (ie, the first sub-PRB, the second sub-PRB, and the third sub-PRB) is composed of 12 subcarriers, respectively. . The bandwidths of the first sub-PRB to the third sub-PRB are 0.5, 2, and 4 times the bandwidths of the basic PRB, respectively. Also in FIG. 10, a method is used in which the boundary between sub-PRBs is aligned with the boundary between basic PRBs. At this time, since PRB bandwidths for the neuronologies differ from each other by 2 ^N times (where N is an integer), as illustrated in FIG. 10, a nested structure may be satisfied. That is, one PRB having a subcarrier spacing of 2 * Δf occupies two contiguous PRBs having a subcarrier spacing of Δf, and one PRB having a subcarrier spacing of 4 * Δf has a subcarrier spacing of 2 * Δf. A continuous PRB may occupy two frequency domains. In addition, one PRB having a subcarrier spacing of Δf may occupy two frequency domains of consecutive PRBs having a subcarrier spacing of 1/2 * Δf. For example, the number of subcarriers (eg, 12) belonging to the PRB to which the basic neuralology is applied among the plurality of numerologies may be equal to the number of subcarriers belonging to the PRB to which the first sub-neuralology is applied. The boundary of the PRB to which the numerology is applied may be aligned with the boundary of the PRB to which the first sub-neumerology is applied. Specifically, at least one of the subcarriers belonging to the PRB to which the basic neuralology is applied (eg, subcarrier 0) is assigned to at least one of the subcarriers belonging to the PRB to which the first sub-neutralology is applied (eg, subcarrier 0). Can be aligned. In FIG. 12, a peak of a subcarrier means a position of a subcarrier, and aligning subcarriers belonging to heterologous numerologies means that peaks of subcarriers belonging to heterologous numerologies are aligned. The physical channel (or physical signal) using the PRB defined as described above may be generated and transmitted by the base station.

However, since the bandwidth of the first sub-PRB is smaller than the bandwidth of the primary PRB, all of the boundaries between the sub-PRBs cannot be aligned to the boundaries between the primary PRBs. The method of aligning PRB boundaries between the numerology to the maximum can simplify the signaling by reducing the number of cases for the numerology setting and the guard band setting.

In FIG. 10, it is assumed that an explicit DC subcarrier is defined for each numerology. However, as described above, a method of aligning the boundaries between PRBs of heterologous neuronals may be used regardless of the presence or absence of a DC subcarrier.

The above-described method A130 to method A132 are methods in which PRB bandwidths for each neuronage are fixed. Meanwhile, a method in which the base station sets the PRB bandwidth to the terminal may be used. The most flexible way to do this is by way of the base station being able to set the PRB bandwidths of all of the neurology. However, this method generally increases the signaling overhead to the terminal. In addition, when bandwidth information of the basic PRB is transmitted through the PBCH, there is a problem that the PBCH resource region should be widened. Alternatively, there is a method in which the bandwidth of the basic PRB has a fixed value and the base station can set the bandwidth of the sub PRB. In this case, the bandwidth of the sub-PRB and the bandwidth of the basic PRB may have an integer multiple of each other. As such, in the case where the PRB bandwidth is variable, a resource setting method for supporting the same may be complicated.

On the other hand, in case of an LTE system, the number of PRBs may be even or odd depending on the system bandwidth of the carrier. If the number of PRBs is odd, there is one central PRB. The NR system can similarly support both even and odd PRBs. However, assuming that the number of PRBs is odd and there is one central PRB, the central FRB may have an odd number of PRBs when one FRB is to be located at the center of the bandwidth as illustrated in FIG. 2D. . Therefore, it is not possible to ensure that the FRB bandwidth consists of even PRBs while the FRB bandwidth is the same for all FRBs. In other words, it is impossible to use the principle and method A103 of FIG. 2D at the same time. Also, as illustrated in FIG. 2E, when the FRB is configured, one central PRB may not be included in either FRB. In addition, as illustrated in FIG. 9B, the central PRB may have a different number of subcarriers than the number of subcarriers that other PRBs have.

In order to solve the above problem, the number of basic PRBs for NR carriers may always be even regardless of the basic neuronology and system bandwidth. That is, the number of basic PRBs included in one NR carrier may be even. If the number of PRBs is even, the center frequency of the NR carrier may be located at the boundary between two PRBs located in the middle. For example, an LTE carrier with a system bandwidth of 5 MHz has 25 PRBs. In this case, assuming that the numerology has a subcarrier spacing of 15 kHz and 12 subcarriers per PRB in the same system bandwidth (for example, 5 MHz), the NR carrier has 25 even PRBs. There are a method of defining 24 PRBs subtracting one PRB from a PRB, and a method of defining 26 PRBs by adding one PRB to 25 PRBs. In the latter case, if the bandwidths of all PRBs have the same size as before, the guard band should be reduced in size, which may or may not be possible depending on the characteristics of the NR waveform. In a method of defining an even number of PRBs without reducing the guard band size, there is a method of defining a PRB such that the number of subcarriers of some PRBs is different from the number of subcarriers of each of the other PRBs. For example, one or two of the PRBs at either end of the PRBs adjacent to the system guard band may be configured with fewer subcarriers or more subcarriers than the number of subcarriers of each of the other PRBs. In the above example in which a system bandwidth of 5 MHz and a subcarrier spacing of 15 kHz are used, the total number of subcarriers is kept the same, but two PRBs adjacent to the guard band among the 26 PRBs may include six subcarriers. . That is, at least one of the even number of basic PRBs included in one NR carrier may have a bandwidth smaller than that of each of the remaining PRBs.

11 is a diagram illustrating coexistence with LTE NB-IoT when the number of PRBs of NR carriers is even according to an embodiment of the present invention. In FIG. 11, the subcarrier spacing for the LTE DL carrier is 15 kHz, and the subcarrier spacing for the NR DL carrier is 15 kHz.

When the NR carrier coexists with the 'NB-IoT carrier in LTE band', if the system bandwidth of the NR carrier is one of 3 MHz, 5 MHz, and 15 MHz of the existing LTE, as illustrated in FIG. 11, the LTE NB-IoT DL carriers (eg, occupying a bandwidth of 180 kHz) may be placed across two PRBs of an NR DL carrier. Therefore, when resource allocation in units of PRBs is used, additional resource loss may occur by one PRB. The problem that the frequency resource region of the LTE NB-IoT carrier is not aligned with one NR PRB may generally occur in all cases where the boundary of the LTE PRB and the boundary of the NR PRB are not aligned. This problem can be solved through a method of semi-statically setting a frequency region where NB-IoT is set as a blank resource to which no signal is transmitted, and allocating resources only to the remaining regions of the PRB including the blank resource. That is, data transmission of a PRB including blank resources may be rate matched to the blank resources. The configuration information of the blank resource may be broadcasted through SIB or transmitted to the UE by RRC signaling. Alternatively, the above-described problem may be solved by adjusting the PRB bandwidth size when the PRB bandwidth can be set.

In the above embodiments, it has been assumed that the DC subcarriers are not included in any PRB. Meanwhile, a method of configuring a PRB such that the DC subcarriers are included in the PRB may be used. This is referred to as 'Method A133'.

Method A133 is a method in which a DC subcarrier is included in the 'number of subcarriers per PRB'. Therefore, when the 'number of subcarriers per PRB' is configured to be constant for a particular numerology, the sum of the number of DC subcarriers and the number of non-DC subcarriers is constant for each PRB.

12A and 12B illustrate a PRB configuration based on method A133, according to an embodiment of the present invention.

In detail, FIGS. 12A and 12B illustrate a case where one DC subcarrier exists in a center of a carrier bandwidth and one DC subcarrier is included in a specific PRB.

In FIG. 12A, if a total of 2 * N PRBs (where N is a natural number) of PRBs (eg, PRB 0, PRB 1, ..., PRB (2 * N-1)) exists, PRB N times The case of including one DC subcarrier is illustrated. In FIG. 12B, if a total of (2 * N + 1) (where N is a natural number) PRBs (e.g., PRB 0, PRB 1, ..., PRB (2 * N)) exist, PRB ( The case where N-1) includes one DC subcarrier is illustrated. In FIG. 12A and FIG. 12B, it is assumed that each PRB consists of the same number of subcarriers (eg, 12) regardless of whether or not a DC subcarrier is included. If method A133 is used, the DC subcarrier may be transmitted at a fixed location. For example, as illustrated in FIGS. 12A and 12B, the DC subcarriers may be transmitted in the very center of the carrier bandwidth.

On the other hand, in the case where a plurality of numerologies are used in one NR carrier, the method A133 may be applied to each of the neuralologies.

FIG. 13 is a diagram showing how a PRB is configured based on method A133 for each of a plurality of neurolages according to an embodiment of the present invention. In FIG. 13, three neuroludges (eg, first neuron, second, and third neurology) are illustrated. In FIG. 13, it is assumed that the first pneumonology has a subcarrier spacing of Δf, the second pneumonia has a subcarrier spacing of 2 * Δf, and the third neuralology has a subcarrier spacing of 4 * Δf.

Specifically, FIG. 13 illustrates a case in which method A132 is used for PRB bandwidth scaling between numerology, and a PRB boundary is aligned between numerology.

As illustrated in FIG. 13, when the position of the DC subcarriers per numerology is fixed to the center of the carrier bandwidth, the DC subcarriers per numerology may be included in one of two central PRBs. In this case, unlike the embodiments of FIGS. 8A to 10, the frequency positions of the DC subcarriers for the neuronologies are not the same and there may be some offset (eg, 0.5 * Δf˜1.5 * Δf) from each other. . In addition, subcarrier grid graduations of the numerology may not be aligned with one another. That is, as illustrated in FIG. 13, the subcarrier grid scale (ie, the frequency values of the subcarriers) of the numerology having a large subcarrier spacing (eg, the second numerology) has a numerology having a small subcarrier spacing ( For example, there is an offset by half of the subcarrier grid scale spacing for the latter (e.g., the first numerology), not aligned to the subcarrier grid scale of the first neural roller. This is a distinguishing feature from the above-described embodiments of FIGS. 8A to 10.

In the case where method A133 is used, a plurality of DC subcarriers can be defined for one NR carrier and one neutral. This may be useful if the system wishes to simultaneously support terminals with various bandwidth capabilities on one NR carrier.

14 is a diagram illustrating a method of transmitting a plurality of DC subcarriers based on method A133 according to an embodiment of the present invention.

Specifically, FIG. 14 illustrates a case in which method A133 is applied to a plurality of DC subcarriers and a plurality of DC subcarriers are included in PRBs for one NR carrier and one neurolage.

In FIG. 14, three DC subcarriers (eg, a first DC subcarrier, a second DC subcarrier, and a third DC subcarrier) are assumed. A frequency distance between the first DC subcarrier and the second DC subcarrier is defined as d ₁ , and a frequency distance between the second DC subcarrier and the third DC subcarrier is defined as d ₂ . The frequency locations and relative frequency distances (eg, d ₁ , d ₂ ) of the DC subcarriers can be predefined in the specification. In this case, the DC subcarriers may be arranged at equal intervals on the frequency axis. That is, the frequency distance between two adjacent DC subcarriers may be all the same (eg, d ₁ = d ₂ ). Alternatively, the frequency distance between two adjacent DC subcarriers may be greater than or equal to the size of the frequency bandwidth occupied by one synchronization signal sequence. This may be required for each DC subcarrier for transmission of a synchronization signal. At the same time or separately, the frequency distance between two adjacent DC subcarriers may be an integer multiple of the PRB bandwidth, as illustrated in FIG. 14.

Meanwhile, frequency positions and relative frequency distances of the DC subcarriers are variable, and the base station may select any one or a plurality of subcarriers, and use the selected subcarrier (s) for the use of the DC subcarriers.

Alternatively, a set of subcarriers that can be used as a DC subcarrier is predefined, and the base station may select one or a plurality of subcarriers from the subcarriers included in the set, and use the selected subcarrier (s) for the use of the DC subcarrier.

Alternatively, the position of one DC subcarrier among the plurality of DC subcarriers may be fixed and the positions of the remaining DC subcarriers may be variable. Here, one DC subcarrier having the fixed position may exist at the center of the carrier bandwidth. Here, the positions of the remaining DC subcarriers having the variable position may be arbitrarily determined by the base station.

On the other hand, when there are a plurality of DC subcarriers within one NR carrier, some of the plurality of DC subcarriers may be defined in a fixed position so as not to be included in any PRB, and method A133 may be applied to the others. For example, if one numerology has a plurality of DC subcarriers, there is one DC subcarrier not subject to Method A133 in the center of the carrier bandwidth, and the remaining DC subcarriers subject to Method A133 are centers of the carrier bandwidth. Can be assigned to different frequency positions.

On the other hand, when the method A133 is used, even if the DC subcarrier position in the carrier bandwidth is not predetermined, the terminal can obtain the position of the DC subcarrier in the process of receiving the downlink synchronization signal. For example, a specific subcarrier (eg, one subcarrier located in the center of the frequency domain) may be defined as a DC subcarrier among subcarriers constituting a frequency domain to which a sequence of downlink synchronization signals is mapped. Accordingly, even if the downlink synchronization signal is transmitted in any frequency region within the carrier bandwidth, the terminal can successfully receive the synchronization signal and acquire the position of the DC subcarrier according to the rule. In this case, assuming that the synchronization signal is transmitted by the basic neuronology, the terminal may acquire the position of one DC subcarrier among one or a plurality of DC subcarriers with respect to the basic neuralology. If the terminal needs to know the location of the other DC subcarrier of the same pneumoniae or the DC subcarrier of the other neurolage (s), the terminal receives the corresponding location information from the base station, or the terminal is a corresponding pneumatic as in the above-described method By searching the synchronizing signal using the roller paper, the position of the DC subcarrier can be obtained. In terms of the reception complexity of the terminal, the former method is more effective.

On the other hand, when the method A133 is used, if the same DC subcarrier position is assumed, an offset (eg, Δf) may occur between the boundary of the LTE PRB and the boundary of the NR PRB. Therefore, the same problem may occur that the frequency resource region of the LTE NB-IoT carrier disposed within the NR carrier bandwidth is not aligned with one NR PRB. In order to solve this problem, the above-described method can be used equally.

FIG. 15 is a diagram illustrating PRB numbering for each neurolage according to an embodiment of the present invention. FIG.

Specifically, FIG. 15 illustrates a case where the PRB bandwidth of the multi-neutral is defined by the method A132 and a nested structure (eg, the overlapped structure illustrated in FIG. 10) is applied between the PRB grids of the multi-neutral. have.

The subcarrier spacing of f1 is twice the subcarrier spacing of f0, and the subcarrier spacing of f2 is four times the subcarrier spacing of f0. Thus, the PRB bandwidth for neuron f1 is twice the PRB bandwidth for neuron f0, and the PRB bandwidth for neuron f2 is four times the PRB bandwidth for neuron f0. One of the three neurology (eg, f0, f1, f2) may be defined as the basic neurology.

By method A102, one FRB consists of integer PRBs contiguous on the frequency axis. In FIG. 15, it is assumed that one PRB group is composed of one FRB, and one FRB includes eight PRBs for the neural f0. This is equivalent to one PRB group containing four PRBs for neuronal f1, and one PRB group containing two PRBs for neuronal f2. That is, the number of PRBs included in the PRB group may be determined according to the neuralology applied to the PRB group.

In FIG. 15, it is assumed that PRB group 0 through PRB group 3 correspond to FRB 0 through FRB 3 respectively. The PRB group number is only a cell-specific number for distinguishing a PRB group, and a different PRB group number may be assigned to the terminal. In general, one PRB group may be set as one or a plurality of FRBs.

The terminal may use only one neuron roller for transmission or reception of signals in one PRB group. For example, the UE uses only the neuterolage f0 in PRB group 0 and PRB group 3, uses only the neuralology f2 in PRB group 1, and uses only the neuralology f1 in PRB group 2. Can be used. In the case of a downlink PRB group, a signal received by the UE using a single neuralology may include at least a PDCCH and a PDSCH, and may further include a reference signal (eg, DMRS, CSI-RS). In the case of an uplink PRB group, a signal transmitted by a UE using a single neuralology may include at least a PUCCH and a PUSCH, and may further include a reference signal (eg, DMRS, sounding reference signal (SRS)).

At this time, the PRB number may be defined in each PRB group. This is referred to as 'Method A134'. As illustrated in FIG. 15, in PRB group 0, eight PRBs for neuron f0 exist, so these eight PRBs (PRBs consecutive on the frequency axis) are numbered PRB 0 through PRB 7. Can be priced. In addition, since there are eight PRBs for pneumonia f0 within PRB group 3, these eight PRBs may be numbered from PRB 0 to PRB 7. For example, the base station resources to the terminal using a plurality of PRB groups (e.g., PRB group 0 and PRB group 3 to which the same neuron f0 is applied) are configured for the terminal through the same downlink control information (DCI). In the case of assigning, the index given to the first PRB (or the last PRB) of the eight PRBs included in the PRB group 0 to which the neutral f0 is applied is assigned to the PRB group 3 to which the neural f0 is applied. It may be the same as the index given to the first PRB (or the last PRB) of the eight PRBs included. In addition, since there are two PRBs for pneumonia f2 in PRB group 1, these two PRBs may be numbered as PRB 0 and PRB 1. In addition, since there are four PRBs for pneumonia f1 within PRB group 2, the four PRBs may be numbered from PRB 0 to PRB 3.

Alternatively, the PRB number may be defined in whole or in part of the PRB group corresponding to each neurolage. This is referred to as 'Method A135'. According to method A134, PRB group 3 illustrated in FIG. 15 has PRB 0 through PRB 7. On the other hand, according to method A135, PRB group 3 may have PRB 8 to PRB 15 following PRB number of PRB group 0. For example, when the base station allocates resources to the terminal using a plurality of PRB groups (for example, PRB group 0 and PRB group 3 to which the same neuron f0 is applied) set to the terminal through the same DCI. The index given to the eight PRBs included in PRB group # 3 may be based on the index given to the last PRB of the eight PRBs included in PRB group # 0.

Through a PRB number indicating a PRB in a PRB group or a PRB bundle number indicating a PRB bundle in a PRB group (and / or a PRB group number indicating a PRB group), the base station transmits a data transmission resource (eg, PDSCH resource, PUSCH resources) may be allocated in PRB units (or PRB bundle units). This is referred to as 'Method A136'. In the case of method A136, the use of a PRB number indicating a PRB in a PRB group for data resource allocation may mean that the scheduling information included in the DCI explicitly includes the PRB number (s), and is included in the DCI. The scheduling information may be generated based on the PRB number (s). In the latter case, the terminal may obtain the scheduled PRB number (s) in the PRB group based on the scheduling information of the DCI. In the case of method A136, the use of a PRB group number indicating a PRB group may have the same meaning as described above.

For example, the first terminal may be configured to use pneumatic f0 within PRB group 0 and PRB group 3. The base station may want to schedule PRB 0 to PRB 3 in the PRB group 0 as a data transmission area for the terminal. Specifically, the base station sets at least one PRB group (e.g., PRB group 0) to the terminal, and at least one numer for the at least one PRB group (e.g., PRB group 0) among a plurality of neuronals. A roller paper (eg, pneumonia f0) is set to the terminal, and at least one PRB (eg, PRB 0, among PRBs included in the at least one PRB group (eg, PRB group 0) 1, 2, 3) can be scheduled to the terminal. When the base station configures a plurality of PRB groups to the same terminal, different numerologies may be applied to the plurality of PRB groups configured for the terminal. In this case, the base station may transmit the PRB number or the PRB bundle number (and / or PRB group number) to the terminal through physical layer signaling (eg, downlink control information (DCI)) as scheduling information of the PDSCH (or PUSCH). . In this case, as described above, transmission of the PRB number may mean that scheduling information included in physical layer signaling (eg, DCI) explicitly includes the PRB number (s). For example, the frequency axis resource allocation information of the DCI may include a bitmap in PRB units. Alternatively, the transmission of the PRB number may mean that scheduling information included in physical layer signaling (eg, DCI) is generated based on the PRB number (s). For example, the frequency axis resource allocation information of the DCI may include a bitmap of a PRB bundle unit, and the PRB bundle may be configured of a plurality of consecutive PRBs. For example, if one PRB bundle is set to two PRBs, PRB 0 and PRB 1 in PRB group 0 are defined as PRB bundle 0, and PRB 2 and PRB 3 in PRB group 0 are defined. It can be defined as PRB bundle number 1. In this case, the base station may inform the terminal that PRB bundle 0 and PRB bundle 1 in PRB group 0 are scheduled through DCI, and the terminal may receive PRB 0 through PRB 3 in PRB group 0 through the received DCI. You can see that the burn is scheduled. Meanwhile, the PRB group number may be set to the terminal through higher layer signaling (eg, RRC signaling or MAC control element). The PRB group number may mean a PRB group index, the PRB number may mean a PRB index, and the PRB bundle number may mean a PRB bundle index. Here, the PRB group number transmitted by the base station to the terminal does not necessarily need to be zero, but may be a terminal-specific (eg, UE-specific) number.

For another example, the second terminal may be configured to use the neuterology f1 within PRB group # 2. The base station may want to schedule the PRB 2 to PRB 3 in the PRB group 2 as a data transmission area for the terminal. In this case, the base station may transmit a PRB number or a PRB bundle number (and / or PRB group number) to the terminal through physical layer signaling. Here, the PRB group number transmitted by the base station to the terminal does not necessarily need to be twice, but may be a number assigned to the terminal (eg, UE-specific). The terminal may receive this information from the base station, and may transmit or receive data through the neuralology set in the corresponding PRB group. As described above, in the case where the frequency domain in which a specific numerology is used is limitedly set and the resources in the set frequency domain are allocated to the terminal, it is used for scheduling as compared to the case where the numerology can be used within the entire system bandwidth. The number of PRBs is reduced. Therefore, signaling overhead for the base station to inform the terminal of resource allocation information in units of PRBs (or PRB bundles) may be reduced. In particular, the NR system supports a very wide system bandwidth (eg, up to 400 MHz) unlike the LTE system, so in the case where the amount of traffic to be transmitted is not large, it may be very helpful to limit the frequency domain used for scheduling. .

FIG. 16 is a diagram illustrating PRB numbering for each neurolage according to another embodiment of the present invention. FIG.

The embodiment illustrated in FIG. 16 is similar to the embodiment illustrated in FIG. 15. However, FIG. 16 illustrates a case where the bandwidth of the PRB group is defined differently for each of the neural loci.

That is, one PRB group may be defined as K consecutive PRBs (where K is a natural number) on the frequency axis, regardless of the neuralology. For example, in FIG. 16, one PRB group includes 8 consecutive PRBs. For example, the number of PRBs included in the PRB group 0 to which the neuron f0 is applied is the same as the number of PRBs included in the PRB group 1 to which the neuralology f1 is applied.

Thus, the bandwidth of the PRB group for neuron f1 is twice the bandwidth of the PRB group for neuron f0, and the bandwidth of the PRB group for neuron f2 is 4 of the bandwidth of the PRB group for neuron f0. It is a ship. 16 shows a PRB group (eg, PRB group 0 through PRB group 3) for neurolage f0, a PRB group (eg, PRB group 0 and PRB group 1) for neurolage f1, and a newmer A PRB group (eg PRB group 0) for roller paper f2 is illustrated. It is illustrated in FIG. 16 that method A134 can equally be applied in this case as well.

For example, since there are eight PRBs in PRB group 0 and PRB group 1 for pneumonia f0, these eight PRBs may be numbered from PRB 0 to PRB 7. In addition, since there are eight PRBs within PRB group # 1 for pneumonia f1, these eight PRBs may be numbered from PRB 0 to PRB 7. The base station allocates a data transmission resource to the terminal in PRB units (or PRB grouping units), and can signal the terminal to the PRB number in the PRB group or the PRB group number in the PRB group (and / or PRB group number) according to method A136. have.

Meanwhile, frequency hopping may be applied to an NR PDSCH or a physical uplink shared channel (PUSCH) to obtain a frequency diversity gain in the transmission of a data channel. Here, frequency hopping means that a data channel allocated to a terminal is transmitted through different frequency resource regions in time. Frequency hopping of the NR PDSCH or the NR PUSCH may be performed by a predetermined pattern in units of PRBs (or PRB bundles).

In addition, as described above, in the case where multiple neuronologies are used in one carrier, and regions in which each of the neuralologies are used are separated for each neurale, frequency hopping may be limited to be performed only within a resource region in which the same neuralology is set. have. For example, when the numerology is configured as illustrated in FIG. 15, frequency hopping may be applied between the frequency resource of PRB group 0 and the frequency resource of PRB group 3. That is, some or all of the PRBs belonging to a data channel configured in one terminal may exist in PRB group 0 at time t1 and in PRB group 3 at time t2. However, according to the above rule, frequency hopping cannot be applied between the frequency resources of PRB group 0 and the frequency resources of PRB group 1, and frequency hopping cannot be applied between the frequency resources of PRB group 0 and the frequency resources of PRB group 2.

As mentioned above, the PRB group can be distinguished from the FRB. For example, FRBs are defined by the above-described methods A100 to A103, and one PRB group may correspond to one or a plurality of FRBs. In accordance with the above definition, suppose that a PRB group is a set of PRBs contiguous on the frequency axis for a given numerology. At this time, according to the methods A101 to A103, one PRB group may be configured (or set) with one FRB or FRBs consecutive on the frequency axis. On the other hand, even when the method A100 is used, one PRB group may be configured (or set) with one FRB or with successive FRBs on the frequency axis.

However, if method A100 is used, unlike method A101 to method A103, the frequency axis boundaries of the FRB may not be aligned to the PRB boundaries, but may be located on a particular PRB. That is, the FRB may include an integer number of PRBs, and may further include one or two partial or fractional PRBs. Thus, when method A100 is used, a PRB group may be defined as full PRBs present in one or a plurality of consecutive FRBs. That is, the PRB group may be configured (or configured) with one or a plurality of FRBs, but at this time, the UE may regard only full PRBs in the corresponding area as a PRB group.

17A and 17B are diagrams illustrating a method for setting a PRB group in a terminal according to an embodiment of the present invention. Specifically, FIGS. 17A and 17B illustrate some frequency domains within the system bandwidth.

In FIG. 17A, the case where the FRB is defined by the method A101 is illustrated. One FRB is composed of N consecutive PRBs, where N is a natural number. In this case, by the above-described method, the terminal may receive one or a plurality of FRBs as a PRB group. That is, as illustrated in FIG. 17A, the base station sets a first FRB as a PRB group to a first terminal (eg, first UE) and sets a second FRB as a PRB group for a second terminal (eg, a second UE). In addition, the first terminal and the second FRB may be configured as a PRB group in a third terminal (eg, a third UE). Accordingly, the first terminal (eg, first UE) regards N PRBs constituting the first FRB as a PRB group, and the second terminal (eg, second UE) PRNs N PRBs constituting the second FRB. As a group, and a third terminal (eg, a third UE) may regard (2 * N) PRBs constituting the first FRB and the second FRB as a PRB group.

In FIG. 17B, the case where the FRB is defined by the method A100 is illustrated. One FRB consists of a continuous frequency range of L MHz, where L is a divisor of the system bandwidth. In FIG. 17B, it is assumed that the first FRB includes M ₁ full PRBs and the second FRB includes M ₂ intact PRBs. In this case, by the above-described method, the terminal may receive one or a plurality of FRBs as a PRB group. That is, as illustrated in FIG. 17B, the base station sets a first FRB as a PRB group to a first terminal (eg, first UE) and sets a second FRB as a PRB group for a second terminal (eg, a second UE). In addition, the first terminal and the second FRB may be configured as a PRB group in a third terminal (eg, a third UE). Accordingly, the first terminal (eg, first UE) regards M ₁ full PRBs included in the first FRB as a PRB group, and the second terminal (eg, second UE) is included in the second FRB. M ₂ of whole PRB and considered as a PRB group, and the third terminal (e.g., third UE) is FRB claim 1 and claim to be considered a (M ₁ + M ₂ +1) of complete PRB include a PRB group 2 as FRB Can be.

Meanwhile, a plurality of PRB groups may be set in the terminal. Multiple PRB groups may be considered for various uses. At this time, the frequency domains for the plurality of PRB groups configured for the terminal should be able to overlap each other.

Meanwhile, data transmitted through the PDSCH to the UE may be divided into common data and UE-specific data. Common data is data that a plurality of terminals can receive in common, and may be, for example, system information or a paging message. PDSCH for transmitting common data may be generally scheduled through common control information (eg, DCI). That is, the plurality of terminals may receive the same DCI and decode common data through reception of the same PDSCH corresponding thereto.

By the above-described method, the base station may set a PRB group to the terminal and allocate PDSCH or PUSCH resources using a PRB index (or PRB number) defined in the PRB group. When a plurality of terminals receive different PRB groups, the terminals may operate in different frequency domains for each terminal or may assume different PRB indexes for the same PRB. Therefore, when the data to be transmitted through the PDSCH or the PUSCH is common data, a problem occurs that a plurality of terminals may interpret resource allocation information of the DCI for the common PDSCH differently. Therefore, it may be difficult for a base station to transmit common data through a common PDSCH to a plurality of terminals having different PRB group settings.

In order to solve this problem, a PRB group for common data transmission may be separately set to the UE. That is, the base station may each include a PRB group (hereinafter, referred to as a 'common PRB group') for common data transmission and a PRB group (hereinafter, referred to as 'terminal specific PRB group') for UE-specific data transmission. It can be set to the terminal. At this time, common data may be basically transmitted in the common PRB group. However, a method of allowing UE specific data to be transmitted in the common PRB group may be used. At most one common PRB group may be configured for the UE.

Alternatively, the common PRB group may not be separately defined, some PRBs in a specific PRB group configured in the terminal may be set as a subgroup, and a PRB index may be separately defined only for PRBs set as the subgroup. For example, when a terminal receives a PRB group consisting of 32 consecutive PRBs, some PRBs (eg, 16 PRBs) among 32 PRBs are set as a subgroup and configure a subgroup. PRBs may have indices from 0 to 15. When a common frequency region exists between PRB groups of terminals, a subgroup may be set to be identical to a plurality of terminals in the common frequency region. The base station may allocate a resource of the PDSCH including common data to the terminal using a PRB index of 0 to 15.

On the other hand, the region in which each neuron is used may be defined to be usable on the entire system bandwidth without being divided into FRB or PRB group units. Even in this case, 'neutralological position and border between PRBs' may have a fixed nested structure as described above. In this case, however, as illustrated in FIG. 18, the PRB numbers (e.g., PRB 0, PRB 1, PRB 2, ...) for each numerology (e.g., f0, f1, f2) It may need to be defined within the entire system bandwidth or the entire operating bandwidth of the terminal.

18 illustrates full-band PRB numbering, according to an embodiment of the invention. In Fig. 18, the subcarrier spacing of pneumatic lodge f1 is twice the subcarrier spacing of pneumonia f0, and the subcarrier spacing of pneumonia f2 is four times the subcarrier spacing of pneumonia f0. The PRB bandwidth for neutral f1 is twice the PRB bandwidth for neutral f0, and the PRB bandwidth for neutral f2 is four times the PRB bandwidth for neutral f0.

The base station may schedule data to the terminal through the desired frequency band and the desired neuron using the full-band PRB number. In this case, the frequency domain of the control channel may be set based on a smaller unit than when the concept of the FRB or PRB group is used. For example, the frequency region of the NR PDCCH in which the first neuronology is used may be set using the PRB of the first neuronology as the minimum unit. Referring to FIG. 18, the NR PDCCH may use numerology f0 and occupy a frequency region of PRBs 8 to 23 for PRNs. In the case where NR carriers supporting multiple neuronologies are used, an uplink control channel and a downlink control channel may also be transmitted by the multi-neurologic.

Meanwhile, the concept of a virtual resource block (VRB) is used in an LTE system. VRB means a logical RB at the time when the base station performs resource allocation, which is mapped to PRBs that are actually physically continuous according to a predetermined mapping rule. In this specification, the term PRB is used as the meaning of RB without distinguishing the concept of PRB and VRB. If a PRB and a VRB are distinguished in an NR system, the PRB described herein may mean a PRB of LTE or a VRB of LTE according to the contents described herein. Specifically, if the PRB is used as a unit at the time when the resource allocation of the base station is performed in the content described herein, such a PRB may be interpreted as a VRB. For example, the PRBs illustrated in FIGS. 15 and 16 may be interpreted as VRBs, and these VRBs may be mapped to PRBs having actual physical meanings according to predefined mapping rules.

Meanwhile, the NR system should support terminals having various transmission bandwidth capabilities in one carrier. That is, a terminal capable of using the entire system bandwidth of the NR carrier and a terminal capable of using only a part of the system bandwidth of the NR carrier may coexist. The terminal should report its transmission bandwidth capability to the base station. The base station receives the transmission bandwidth capability in the process of establishing an RRC connection with the terminal, and can set the operating frequency band of the terminal in the NR carrier based on this. At this time, in order to facilitate such setting, the base station may inform the terminal of the system bandwidth and the center frequency of the NR carrier. The time point at which the base station transmits the system bandwidth and the center frequency to the terminal may be faster or the same as the time point at which the base station sets the operating frequency band to the terminal.

For example, the terminal may acquire the center frequency position and the system bandwidth information through the reception of the downlink synchronization signal and / or broadcast information during the initial access process. In this case, the terminal may acquire basic neural information together, and through this, it is possible to obtain a PRB grid (eg, the total number of PRBs, the number of subcarriers per PRB, the position of the PRB boundary, etc.) of the basic neuralology. In addition, if the configuration information of the FRB or the configuration information of the PRB group is defined, the terminal can find out the configuration information of the FRB or the configuration information of the PRB group through the configuration information of the PRB grid. Accordingly, the base station can set a desired frequency range within the system bandwidth as the operating frequency band of the terminal, and the terminal can know which position the frequency region set by the terminal belongs to from a system perspective. The UE may perform control information transmission, data transmission, pilot transmission, time-frequency synchronization and beam management, RRM measurement and RRM reporting, CSI measurement, and CSI reporting within the set operating frequency band. If the link performance deteriorates (eg, when a radio link failure (RLF) occurs) within the operating frequency band, the terminal may perform a fallback operation. Specifically, the terminal may transmit and receive a signal (eg, an initial access signal and an initial access channel) in an area outside the operating frequency region, perform synchronization and beam acquisition again, or transmit a PRACH again. At this time, the base station may reset the operating frequency band to the terminal.

[Guard band]

If heterologous neurons are multiplexed via FDM within one NR carrier, guard bands may be inserted to mitigate interference between the heterologous neurons. No signal is basically transmitted in the guard band, but if necessary, a narrowband signal of an NR system or another system different from the NR system may be transmitted in the guard band. For example, in the guard band, an LTE NB-IoT carrier may be transmitted.

As described above, when the numerology is set using one or a plurality of FRBs as a basic unit on the frequency axis, the FRB can also be a reference for setting the guard band. For example, guard bands may be inserted at both ends of the frequency domain occupied by each FRB. Hereinafter, a description will be given of a method for setting guard bands between the neurolages using FRB as a basic unit in an NR carrier.

First, a set of FRBs in which guard bands can be set may be defined. Method A140 and Method A141 distinguish FRBs from anchor FRBs and non-anchor FRBs.

Specifically, the method A140 is a method in which guard bands can be set in all FRBs including the anchor FRB, and the method A140 provides the most flexible resource setting method. However, the method A140 has a disadvantage in that whenever a setting of a guard band for the anchor FRB is changed, a terminal that is already using the anchor FRB for transmission needs to reset the effective frequency resource region of the anchor FRB.

Method A141 is a method in which the guard band can be set only in the remaining FRBs except the anchor FRB among the FRBs, and has the advantage that the effective resource area of the anchor FRB does not change.

Method A140 and method A141 may be applied to both a first type NR carrier and a second type NR carrier. In the case of the second type NR carrier, as described above, there may be several anchor FRBs, where a guard band may not be defined for all anchor FRBs.

Method A 142 and Method A 143 are methods of dividing the FRB into the neurolage types set in the FRB.

Specifically, the method A142 is a method in which the guard band can be set only in the FRB set as the subneuronal. Method A142, similar to method A141, has the advantage that the effective resource area of the FRB set as the basic neuronology does not change. In particular, this may be helpful for a terminal using a basic neuron as a primary neuron to monitor the PDCCH in which the basic neuron is used. However, in the case of the second type NR carrier, since there may be a terminal using the subneuronal as the primary neuron, the method A142 may be applied to the first type NR carrier.

Method A143 is a method in which the guard band can be set only in the FRB set as the basic neutralizer. Method A143 may be efficient for allocating the PRB of the subneuronal.

On the other hand, in the case where a plurality of numerologies are multiplexed through TDM in one FRB, the guard band may be defined or set differently for each numerology.

On the other hand, in the case where the guard band is set between two FRBs in which two different numerologies are used, the guard band may generally be set in only one of the two FRBs. For example, a guard band may be set only in an FRB in which a numerology having a smaller subcarrier spacing is used. This is referred to as 'Method A144'. As another example, the guard band may be set only in the FRB in which a numerology having a larger subcarrier spacing is used. This is referred to as 'Method A145'.

Methods A144 and A145 can be used in combination with methods A140 through A143. For example, assuming that Method A144 and Method A141 are combined, Method A144 may be applied to the remaining FRBs except the anchor FRB among the FRBs. For another example, assuming that method A144 and method A142 are combined, method A144 is applied to the guard band setting between FRBs set as sub-neutrals, and one of two adjacent heterologous neuronals is the primary one. In the case of an index, according to the method A142, a guard band may be set in the FRB set as the subneuronal.

19A, 19B, and 19C illustrate method A142.

19A, 19B, and 19C are diagrams illustrating a method of setting a neuralology and a guard band based on method A140 or method A142 according to an embodiment of the present invention.

Specifically, FIGS. 19A, 19B, and 19C illustrate the case where two heterologous neurons are multiplexed through FDM in a NR carrier and a guard band is set between the neurolologies.

In Figures 19A, 19B, and 19C, subcarrier grids are defined per numerology by method A110, with the central frequency location of the numerology being the same for all the neuralology and the DC subcarrier location of the numerology being for all the neuralology. Assume the same for

In Figures 19A, 19B, and 19C, it is assumed that one FRB consists of four basic PRBs by Method A103, and that PRBs of NMR are composed of twelve subcarriers equally for all NMRs by Method A132. do. The FRB configurations illustrated in FIGS. 19A, 19B, and 19C may be suitable for the first type NR carrier, as described above.

In FIGS. 19A, 19B, and 19C, it is assumed that a basic neuron is applied to the first FRB and a sub-neurology is applied to the second and third FRBs.

As method A142 is used, there is no guard band in the first FRB to which the basic neuralology is applied. Therefore, all four basic PRBs belonging to the first FRB can be used for transmission.

On the other hand, guard bands are inserted in the second FRB and the third FRB. Since the same numerology is applied to the second FRB and the third FRB, the guard band is not set in the boundary direction between the second FRB and the third FRB, and a guard band is inserted in the opposite direction of the second FRB and the third FRB, respectively. Can be. If the first FRB is considered an anchor FRB in FIGS. 19A, 19B, and 19C, method A140 may be interpreted as used.

In FIG. 19A, the subcarrier spacing of the first sub-neutral is twice the subcarrier spacing (eg, Δf) of the basic neuralology, and the first sub-PRB, which is the PRB of the first sub-neuralology, consists of two basic PRBs. Thus, as illustrated in FIG. 19A, of eight basic PRBs belonging to the second FRB and the third FRB, the first basic PRB may be set as a guard band, and the three primary PRBs from the second basic PRB to the seventh basic PRB may be set. One sub-PRB may be set and the last basic PRB may be set as a guard band.

In FIGS. 19B and 19C, the subcarrier spacing of the second subneuronal is four times the subcarrier spacing (eg, Δf) of the basic neuralology, and the second subPRB, which is the PRB of the second subnumerology, is four basic PRBs. It is composed. Therefore, as illustrated in FIG. 19B, of the eight basic PRBs belonging to the second FRB and the third FRB, the first two basic PRBs may be set as guard bands, and from the third basic PRB to the sixth basic PRB, 1 may be set. Second sub-PRBs, and the last two basic PRBs may be set as guard bands.

Alternatively, as illustrated in FIG. 19C, among eight basic PRBs belonging to the second FRB and the third FRB, the first basic PRB may be set as a guard band, and two second PRBs to seventh basic PRBs may be set. The sub-PRB may be set, and the last basic PRB may be set as the guard band. Here, the number of basic PRBs allocated as the second sub-PRBs is six, not a multiple of four. Accordingly, the first second sub-PRB of the two second sub-PRBs is composed of four basic PRBs, but the second second sub-PRB (that is, the last second sub-PRB) has two (= mod (6, 4) ) May be configured as a basic PRB.

Generalizing the embodiments of FIGS. 19A and 19B is as follows. That is, in the case where the subcarrier spacing of the basic neuron is Δf, the size of the guard band for the FRB to which the subnumerology having a subcarrier spacing of N * Δf (where N is a natural number) is log ₂ N basic PRBs It can be determined by the bandwidth for. This is referred to as 'Method A150'. Specifically, method A150 may be generalized as follows. That is, the size of the guard band for the FRB may be set to log ₂ N PRBs based on the PRB corresponding to the numerology set in the FRB. However, a disadvantage of this method is that the guard band can be set excessively wide when the subcarrier spacing is large.

Alternatively, generalizing the embodiments of FIGS. 19A and 19C is as follows. That is, it can be defined such that the size of the guard band for the FRB to which the subneuronology is applied always has a fixed value. This is called 'Method A151'. 19A and 19C correspond to the case where the guard band size is defined as one basic PRB. If method A151 is used, as illustrated in FIG. 19C, the bandwidth of a particular sub-PRB (eg, the last sub-PRB) may be less than the bandwidth of each of the other sub-PRBs. Alternatively, the size of the guard band for the FRB may be determined as N PRBs based on the PRB corresponding to the numerology set in the FRB. This is referred to as 'Method A152'. For example, N can be fixed to N = 1.

Meanwhile, the guard band for the FRB to which the numerology having a subcarrier spacing smaller than the subcarrier spacing of the basic neuralology is applied may be one basic PRB or one PRB for the corresponding subneuronal. The former is called 'method A153' and the latter is called 'method A154'. For example, one PRB is composed of 12 subcarriers, and a FRB (primary FRB) to which a basic numerology having a subcarrier spacing of 15 kHz is applied, and a FRB to which a subnumerology having a subcarrier spacing of 7.5 kHz is applied (the latter is applied). Assume that FRB) are adjacent to each other. According to method A153, a guard band of 180 kHz (= 12 * 15 kHz) may be inserted into the latter FRB, or according to method A154, a guard band of 90 kHz (= 12 * 7.5 kHz) may be inserted into the latter FRB.

Alternatively, the guard band for the FRB to which the pneumatics having a subcarrier spacing smaller than the subcarrier spacing of the basic pneumatics is applied may be a plurality of basic PRBs, or may be a plurality of PRBs for the corresponding subneuronal.

Method A153 and method A154 can be used in combination with method A150 and method A151. For example, method A151 is applied to a sub-neumerology with subcarrier spacing greater than the primary and / or subcarrier spacing of the base-neutral. Method A153 or method A154 may be applied.

The embodiments of FIGS. 19A-19C assume the case where method A103 is applied to the FRB configuration. Each FRB consists of integer PRBs. Therefore, in setting the guard band, it is possible that the methods A140 to A143 are used and the guard band is set in integer multiples of the PRB.

However, when method A100 is applied to the FRB configuration, it may be difficult to use method A140 to A143.

20A and 20B illustrate a FRB configuration, a neuralology setting, and a guard band setting based on method A100 according to an embodiment of the present invention.

Specifically, in FIG. 20A and FIG. 20B, a case in which heterologous neuronal coexists through FDM in one carrier is illustrated.

20A and 20B assume that FRB is defined by method A100. Thus, each FRB is not composed of an integer number of PRBs, and subcarrier (s) excluded from the PRB may exist per FRB. For example, there are 51 subcarriers in the first FRB illustrated in FIG. 20A. Of the 51 subcarriers, 48 subcarriers constitute 4 basic PRBs, and the remaining 3 subcarriers remain without forming a PRB. This residual subcarrier (s) excluded from the PRB configuration may occur at the boundary between the FRBs to which different numerologies are applied. In this case, the remaining subcarrier (s) may be used as a guard band between heterogeneous neurology.

20A and 20B, the basic neuronology is set in the first FRB, the first sub-neumerology is set in the second FRB and the third FRB, and the basic PRB and the first sub-PRB are set by the method A132. It is assumed that each of 12 subcarriers is configured. The subcarrier spacing of the first sub-neutral is twice the subcarrier spacing (eg, Δf) of the basic neuterology, and the first sub-PRB (PRB of the first sub-neumerology) is composed of two basic PRBs.

The embodiment of FIG. 20A assumes that the subcarrier grid is defined by method A110, the central frequency location of the neuralology is the same for all the neuralology and the DC subcarrier location of the neuralology is the same for all the neuralology. Seven basic PRBs included in the frequency domain of the second FRB and the third FRB are used as four first sub PRBs. The remaining subcarriers excluded from the PRB configuration are set as guard bands. At this time, similar to the embodiment of FIG. 19C, the number of basic PRBs in the frequency domain of the second FRB and the third FRB is not divided by two. Therefore, each of the three first sub-PRBs has 12 subcarriers, and the other one first sub-PRB has 6 subcarriers. If all the sub PRBs are set to have the same bandwidth, the remaining one first sub PRB is not defined, and the frequency domain for the remaining one first sub PRB may be used as a guard band.

In the embodiment of FIG. 20B, the subcarrier grid is defined by method A111, the frequency domain of the subcarrier grid is different with respect to the primary and subneuronal, and the positions of the DC subcarriers are different with respect to the primary and subneuronal. Assume another case. In this case, the first sub-PRB is not defined by the basic PRB, and is independently defined on a separate subcarrier grid. In FIG. 20B, four first sub-PRBs are defined in the frequency domain of the second FRB and the third FRB. In FIG. 20B, the case where the DC subcarrier of the first sub-neurology is located in the center of the frequency region of the second FRB and the third FRB is illustrated. However, considering that the number of carrier raster points is finite, it may be difficult for the DC subcarrier to be located in the center of the frequency domain of the second FRB and the third FRB.

The above-described methods are methods in which presence or absence of a guard band, a size of a guard band, and / or a location of a guard band are predetermined. Meanwhile, the guard band may be variably set by the base station, and information about the guard band may be signaled to the terminal. In addition, one or more of the above-described guard band setting methods (e.g., method A140 to A154) are defined in the standard, and one or more of the above-described guard band setting methods (e.g., method A140 to Method A154) are terminal. May be signaled to.

[ PDCCH  Resource area]

The PDCCH of the LTE system is transmitted full-band within the effective period of the system bandwidth. On the other hand, in the case of the NR system, since one carrier must support a plurality of numerologies or have forward compatibility, the PDCCH resource region needs to be limited to a specific region not only in the time axis but also in the frequency axis in some cases. For this purpose, a PDCCH block may be defined.

The PDCCH block is a time-frequency resource on which one or more PDCCHs can be transmitted. The PDCCH block may consist of X FRBs and Y OFDM symbols. In the case where one PDCCH block consists of a plurality of FRBs, the FRBs may be continuous or discontinuous on the frequency axis. Alternatively, the PDCCH block may consist of Z PRBs and Y OFDM symbols. If one PDCCH block consists of a plurality of PRBs, the PRBs may be continuous or discontinuous on the frequency axis.

In this case, a PDCCH search space may be defined for each PDCCH block. Within the FRB (s) occupied by the PDCCH block, the PDCCH block may appear repeatedly per period. For example, a PDCCH block may exist in every subframe within the corresponding FRB (s). That is, the subframe of the NR system may be defined as a period in which the PDCCH resource region appears. In this case, the position of the OFDM symbol starting the PDCCH block may be the same every subframe. Accordingly, the UE may periodically monitor the PDCCH block, but a signal may or may not be transmitted in each PDCCH block.

In order to reduce the PDCCH monitoring complexity of the terminal, the base station may set a time resource region (eg, another service transmission interval) in which the PDCCH is not transmitted to the terminal, and the terminal may omit the PDCCH monitoring within the configured interval. In case of the LTE system, a PDCCH region (full-band PDCCH region) present in every subframe may correspond to one PDCCH block. However, since the NR carrier may have a plurality of FRBs, there may be a plurality of PDCCH blocks along the frequency axis.

21 illustrates how a PDCCH block is arranged in an NR carrier.

21 is a diagram illustrating a PDCCH block arrangement according to an embodiment of the present invention.

Specifically, in FIG. 21, three PDCCH blocks (eg, a first PDCCH block, a second PDCCH block, and a third PDCCH block) are included in four FRBs (eg, a first FRB, a second FRB, a third FRB, and a fourth FRB). ) Is illustrated.

The first PDCCH block is set in the first FRB and the second FRB (ie, X = 2), the second PDCCH block is set in the third FRB (ie, X = 1), and the third PDCCH block is set in the fourth FRB. Is set to (i.e., X = 1).

The first PDCCH block consists of two consecutive OFDM symbols (ie Y = 2), the second PDCCH block consists of three consecutive OFDM symbols (ie Y = 3), and the third PDCCH block has two It consists of two consecutive OFDM symbols (ie, Y = 2).

In the embodiment of FIG. 21, it is assumed that the first pneumatics are applied to the first PDCCH block and the second PDCCH blocks, and the second pneumatics are applied to the third PDCCH block. Each PDCCH block may be repeatedly arranged according to a certain period (eg, a subframe) on the time axis. When the OFDM symbol length of the second pneumatics is shorter than the OFDM symbol length of the first pneumatics, the time axis allocation period of the third PDCCH block may be shorter than that of each of the remaining PDCCH blocks.

Guard bands may be inserted at both ends or one end of the frequency domain occupied by the PDCCH block. At this time, the guard band insertion methods described above may be used in the same manner. In the embodiment of FIG. 21, since the same numerology is applied to the first PDCCH block and the second PDCCH block, a guard band is not set between the first PDCCH block and the second PDCCH block. In the embodiment of FIG. 21, since heterologous numerologies are applied between the second PDCCH block and the third PDCCH block, a guard band is set between the second PDCCH block and the third PDCCH block. Also, since the embodiment of FIG. 21 assumes that method A141 is used, the second PDCCH block existing in the third FRB, which is the anchor FRB, occupies all of the bandwidth of the third FRB without a guard band.

22 is a diagram illustrating a relationship between a PDCCH block and a data region according to an embodiment of the present invention. In FIG. 22, time slots for a PDCCH block and a data region may be a subframe.

As illustrated in FIG. 22, the bandwidth occupied by the PDCCH block (eg, available bandwidth) may be the same as the bandwidth occupied by the data region in the corresponding FRB (s). That is, for each FRB, the same guard band may be applied to the PDCCH region and the data region.

In FIG. 22, the case where a PDCCH block is set in one FRB is illustrated. Within the same FRB, the same neuron may be applied to the PDCCH block and the data region corresponding to the PDCCH block. Alternatively, in the same FRB, the same neuron may be applied to the PDCCH block and the data region corresponding to the PDCCH block for at least the same subframe. However, as illustrated in FIG. 22, the possibility that a signal transmitted through another neuron may puncture the PDCCH region of the FRB or the data region of the FRB is not excluded. When the bandwidth occupied by the data area in a certain FRB or FRB set is composed of a plurality of PRBs, according to the above method, the PDCCH region may be configured of a plurality of PRBs. In the data area, uplink, downlink, and sidelink data may be transmitted.

On the other hand, when different numerologies are applied to the PDCCH region and the data region in the same FRB, different guard bands may be applied to the PDCCH region and the data region. For example, in some FRBs, pneumatics such as numerology for the same time domain of adjacent FRBs are applied to the PDCCH region, so that no guard band is placed in the PDCCH region, and the data region for the same time domain of adjacent FRBs. The neuralology and other neuralology may be applied so that a guard band may be arranged in the data area.

Meanwhile, one PDCCH block may include only anchor FRB (s) or only FRB (s), not anchors. This is referred to as 'Method A162'. Alternatively, a PDCCH block composed of at least anchor FRB (s) in the NR carrier may be defined. This is referred to as 'Method A163'.

The above methods (eg, method A162 and method A163) allow the downlink control information to be received using a PDCCH block defined localized to the anchor FRB when the UE knows only the anchor FRB. In the case where there are a plurality of anchor FRBs for one numerology, one PDCCH block may be defined to include all anchor FRBs, and a PDCCH block may be defined for each anchor FRB. The former method can widen the bandwidth of the PDCCH block and increase the frequency diversity gain. If the anchor FRB is present per neuraleology, Method A162 and Method A163 may be used per Nerological.

Meanwhile, the PDCCH block in the anchor FRB may be fixedly allocated regardless of whether the base station is configured. Hereinafter, the PDCCH block having this feature in the anchor FRB is referred to as a 'fixed PDCCH block'. If a fixed PDCCH block is defined, a terminal not in an RRC connected state may also receive downlink control information using the fixed PDCCH block when initially connecting to an NR carrier. In the anchor FRB, the UE may periodically monitor the fixed PDCCH block according to a predefined period (eg, every subframe of the primary neuron).

On the other hand, when the PDCCH block is composed of only anchor FRB (s), due to bandwidth constraints, it may be difficult to secure sufficient PDCCH search space. In order to solve this problem, a setting method may be used such that the basic PDCCH block including the anchor FRB further includes the FRB other than the anchor. At this time, the terminal in the RRC connection state, the information for the frequency resource region of the basic PDCCH block may be signaled from the base station. The UE that is not in the RRC connection state may receive information for the frequency resource region of the basic PDCCH block before performing PDCCH monitoring by receiving the first signal set.

Meanwhile, the PDCCH block in the FRB (s) other than the anchor may be configured to the terminal by the base station. Configuration information of the PDCCH block may be transmitted as broadcast information or an RRC parameter. In more detail, the UE may explicitly or implicitly signal configuration information (eg, resource location and / or neuralology) of the PDCCH block from the base station. Taking the latter implicit signaling as an example, after the UE is signaled with the neuronal configuration information of the FRB (s) that is not an anchor, the UE may perform signaling in the corresponding FRB (s) according to a predefined relationship with the signaled neuronal configuration. PDCCH block configuration information may be derived. For example, in the embodiment of FIG. 21, after the UE receives the first neuronage for the first FRB and the second FRB, the PDCCH block in which the first neuronage is used is configured as the first FRB and the first FRB. Assuming that the second FRB exists at a predetermined period, PDCCH monitoring may be performed. The time axis position of the PDCCH block set in the FRB (s) other than the anchor may be determined by the time axis position of the fixed PDCCH block described above.

On the other hand, as described in the embodiment of Figure 18, it can be considered that all of the neuronologies can be used in all bands without the distinction of FRB (or PRB group). At this time, the neutralizer of the data area may be dynamically set by the base station, and the neutralizer of the control area may be set to the terminal in advance.

FIG. 23 is a diagram illustrating a PDCCH block arrangement according to another embodiment of the present invention. FIG.

In detail, FIG. 23 illustrates a case in which the first PDCCH block in which the first neuralology is used and the second PDCCH block in which the second neuralology is used are set in one NR carrier. Here, the first neuronage is used as the basic neuralology, and the first PDCCH block may always be fixedly transmitted. In FIG. 23, the time slots for the second neurology may be shorter than the time slots for the first neurology.

The UE may receive all or part of the PDCCH block. For example, when the UE monitors the first PDCCH block, the UE receives downlink control information transmitted on the first PDCCH block, thereby enabling PDSCH (eg, first PDSCH, second, etc.) within an operating bandwidth of the UE. PDSCH, third PDSCH) may be scheduled. The first PDSCH is transmitted in the frequency domain in which the first PDCCH block is transmitted. The second PDSCH is transmitted in the frequency domain in which the PDCCH block is not set. The third PDSCH is transmitted in the frequency domain in which the second PDCCH block is transmitted.

At this time, the starting point of the PDSCH may be different according to the frequency domain in which the PDSCH is scheduled. For example, the second PDSCH in the above example may be scheduled from an earlier point in time than the number of OFDM symbols occupied by the first PDCCH block than the first PDSCH and the third PDSCH. As such, the position of the OFDM symbol where the data channel transmission starts may vary according to the frequency domain in which the data channel is scheduled. Therefore, when scheduling a data channel through the downlink control information (DCI) to the terminal, the base station may transmit the OFDM symbol number which is the starting point of the data channel.

On the other hand, as described above, the PDCCH search space may be defined for each PDCCH block. In this case, a method in which the PDCCH search space is defined in the entire PDCCH block (the former method) and a method in which the PDCCH search space is defined separately for each OFDM symbol constituting the PDCCH block (the latter method) may be used. The former method is called 'Method A170' and the latter method is called 'Method A171'.

When the PDCCH block consists of a plurality of OFDM symbols, the method A170 has one wide PDCCH search space and the method A171 has a plurality of narrow PDCCH search spaces.

In the case where the method A170 is used, the UE should know in advance the number of OFDM symbols (ie, the Y value or information corresponding to the Y value) occupied by the PDCCH block before receiving the PDCCH block. The base station may inform the terminal of the Y value in a similar manner as in the LTE system. For example, the base station may inform the UE of the Y value by using a separate channel (hereinafter, referred to as PCFICH) such as a physical control format indicator channel (PCFICH).

On the other hand, when the method A171 is used, the UE may at least attempt to receive the PDCCH in the search space for the first OFDM symbol among the OFDM symbols belonging to the PDCCH block even if the UE does not know the Y value. Therefore, in this case, the Y value may be transmitted to the terminal through more various methods. For example, the PCFICH is defined for each OFDM symbol constituting the PDCCH block, and the base station can inform the UE whether the PDCCH block includes the next OFDM symbol through each PCFICH. In each OFDM symbol, the PCFICH can be multiplexed with the PDCCH via FDM. Or, the base station can inform the terminal whether the PDCCH block includes the next OFDM symbol through the PDCCH of each OFDM symbol constituting the PDCCH block. To this end, a dedicated DCI format for transmitting a 1-bit payload indicating whether the PDCCH block includes the next OFDM symbol may be defined.

Alternatively, a cyclic redundancy check (CRC) or a scrambling identifier (ID) applied to the PDCCH may be distinguished according to whether the PDCCH block includes the next OFDM symbol. In this case, when receiving the PDCCH, the UE may blindly decode a plurality of CRCs (or a plurality of scrambling identifiers), thereby determining whether the PDCCH block includes the next OFDM symbol.

When the above-described methods are used, the PCFICH or DCI is not defined in the last OFDM symbol constituting the PDCCH block, or the UE may not perform blind decoding on the last OFDM symbol constituting the PDCCH block. Since the time axis length may be different for each PDCCH block, the PCFICH or DCI may be defined for each PDCCH block. On the other hand, even when the method A171 is used, as in the case of the method A170, before the UE receives the PDCCH block, it is possible to first obtain the Y value by receiving the PCFICH.

Method A170 and Method A171 can be used in combination. For example, the first OFDM symbol of the OFDM symbols belonging to the PDCCH block may configure one PDCCH search space, and the remaining OFDM symbols of the OFDM symbols belonging to the PDCCH block may configure another PDCCH search space. In this case, in the case of a PDCCH block including a PDCCH shared search space, at least, the PDCCH search space on the first OFDM symbol may include a PDCCH shared search space. In this case, the Y value may be transmitted through the PDCCH common search space on the first OFDM symbol.

In the PDCCH block, a reference signal (RS) or another control channel may also be transmitted. For example, the PDCCH block may include a demodulation RS (DMRS), a physical hybrid automatic repeat request indicator channel (PHICH), a PCFICH, a header signal, and the like, used to decode the PDCCH.

[First Signal Set]

As described above, the first signal set may include a downlink synchronization signal, a PBCH, a BRS, and / or an uplink PRACH. In this case, the method A180, the method A181, or the method A182 may be applied to the frequency resource region in which the first signal set to which the basic neuronology is applied in the NR carrier is transmitted.

The method A180 is a method in which the frequency resource region to which the first signal set to which the basic neuralology is applied is transmitted includes the center frequency of the NR carrier (ie, the center of the subcarrier grid for the basic neuralology). According to the method A180, since the frequency domain in which the first signal set is transmitted is fixed, constraints may be placed on the setting of the neuralology and the resource in the frequency domain. However, a low cost terminal (eg, LTE MTC terminal, NR mMTC terminal) that has a low reception complexity with respect to the first signal set of the terminal and can only receive a narrow bandwidth can access the same NR carrier by using basic neuralology. .

Method A181 is a method in which the frequency resource region to which the first signal set to which the basic neuralology is applied is transmitted includes one or a plurality of predefined carrier raster points. If method A181 is used, the set of carrier raster points includes the center frequency of the NR carrier.

Method A182 is a method in which the frequency resource region to which the first signal set to which the basic neuralology is applied is transmitted comprises one or a plurality of predefined carrier raster points. When method A182 is used, the set of carrier raster points does not include the center frequency of the NR carrier.

According to the method A181 and the A182, when the frequency resource region to which the first signal set to which the basic neuralology is applied is transmitted includes a plurality of carrier raster points, the plurality of first signal sets may be transmitted in the frequency resource region. Can be. According to the method A181 and the method A182, the position of the center frequency or the position of the DC subcarrier may be transmitted to the terminal through the transmission of the first signal set. In this case, when all of the plurality of first signal sets include DC subcarriers, as described above, each DC subcarrier may not be included in any PRB, or may be included in any one PRB according to method A133. .

According to the method A181, the first signal set includes a DC subcarrier when the first signal set is transmitted in the center of the bandwidth, and the first signal set when the first signal set is transmitted in a frequency domain other than the center of the bandwidth. May not include a DC subcarrier. In this case, when the terminal receives the synchronization signal, the terminal should assume both a case in which the DC subcarrier is included and not included in the synchronization signal. Therefore, the reception complexity may increase. In order to solve this problem, when the first signal set is transmitted in a frequency domain other than the bandwidth center, the synchronization signal includes one subcarrier serving as a virtual DC subcarrier, and the one subcarrier is at least a synchronization signal. A method used as a null subcarrier may be considered during the transmission period. According to this method, the terminal may receive the synchronization signal using the same receiver, regardless of the frequency domain in which the synchronization signal is transmitted.

On the other hand, when there are a plurality of first signal sets to which the same neuralology is applied in one NR carrier, only some of the plurality of first signal sets may be used for initial access of the terminal. That is, the first signal set (s) used for initial connection and the first signal set (s) not used for initial connection can be distinguished. The same numerology may be a basic neuralology. That is, the first signal set (s) used for initial access and the first signal set (s) not used for initial access may be transmitted by the base station via the same numerology (e.g., primary neuralology). Can be.

Specifically, a sequence (or sequence set) of downlink synchronization signals used for initial access and a sequence (or sequence set) of downlink synchronization signals not used for initial access may be defined differently. That is, when the base station generates and transmits a downlink synchronization signal used for initial access, a sequence (or sequence set) of the downlink synchronization signal for initial access is used for downlink synchronization that is used for a purpose different from that of the initial access. It may be different from the sequence (or sequence set) of the signal.

When the downlink synchronization signal is composed of the PSS and the SSS, since the terminal receives the PSS first and the SSS later, the above-described method may be sufficient to be applied to the PSS. That is, the PSS used for initial access and the PSS not used for initial access are separated by different sequences (or sequence sets), and the SSS used for initial access and the SSS not used for initial access are distinguished. It may not be. On the other hand, when the environment of the radio channel is bad, even though the base station transmits the PSS not used for the initial access, the terminal may successfully detect this PSS and mistake it for the PSS used for the initial access. In this case, it may be helpful for the method described above to be applied to both PSS and SSS. That is, the probability that the terminal incorrectly detects the PSS and the SSS that are not used for the initial access is relatively lower than the probability that the terminal incorrectly detects the PSS that is not used for the initial access.

For example, if a downlink synchronization signal (eg, PSS) is generated as an m-sequence, the sequence length of the synchronization signal used for initial access and the sequence length of the synchronization signal not used for initial access are the same. In addition, different polynomials may be applied to sequence generation. That is, the base station may generate a synchronization signal for initial access and a synchronization signal not used for initial access by using different polynomials.

Or when a downlink synchronization signal (eg, PSS) is generated as an m-sequence, the sequence of the synchronization signal used for initial access and the sequence of the synchronization signal not used for initial access have the same length and are in the same polynomial. Although generated by, different cyclic shift values may be applied to the two sequences. That is, the base station may generate a sync signal for initial access and a sync signal not used for initial access by using different cyclic shift values.

Alternatively, different resource mapping may be applied to the downlink synchronization signal used for the initial access and the downlink synchronization signal not used for the initial access. Here, the different resource mapping may include different numbers of resource elements to which a sequence is mapped, different arrangements of resource elements, and / or different OFDM symbol positions. According to the method, since the terminal searches for a synchronization signal assuming only a sequence (and / or resource mapping) of the synchronization signal used for the initial connection, the terminal receives the synchronization signal used for the initial connection and receives the received synchronization signal. It is highly likely that the initial connection will be attempted based on On the other hand, it is very unlikely that the terminal receives a synchronization signal that is not used for the initial connection and attempts to make an incorrect initial connection based on the received synchronization signal.

The number and / or frequency position of the synchronization signal used for the initial connection is fixed, and the number and / or frequency position of the synchronization signal not used for the initial connection may be variable. For example, only one downlink synchronization signal may be used for initial access of the terminal, and one downlink synchronization signal used for initial access of the terminal may be fixedly located at the center of the carrier bandwidth.

The synchronization signal used for the initial connection is always fixedly transmitted, and the synchronization signal not used for the initial connection may be set to the terminal by the base station as necessary. In the case where the NR carrier is composed of a plurality of numerologies, the above-described methods may be applied per numerology.

Meanwhile, when the first signal set includes two or more kinds of signals (or channels), each signal (or channel) may be transmitted in different frequency domains. For example, the downlink synchronization signal and the PBCH may be multiplexed through FDM. Alternatively, the downlink synchronization signal and the PBCH may be transmitted in the same frequency band, but the PRACH may be transmitted in a different frequency band. In this case, the methods A180 to A182 may be applied only to a portion of the signal (or channel) constituting the first signal set. For example, the methods A180 to A182 apply only to the downlink synchronization signal, and the resource region of the remaining signals (or channels) constituting the first signal set is determined by a relationship with the resource region for the downlink synchronization signal. It may be set by the base station.

On the other hand, the method A183 and the method A184 may be applied to the type of the numerology used for the transmission of the first set of signals in the first type NR carrier.

Method A183 is a method in which the first set of signals is transmitted only through the basic neurology. According to method A183, all terminals should use a basic neuron (ie primary neuron) for the reception (and / or transmission) of the first set of signals. Therefore, a terminal that transmits data using secondary neuralology may also need to use basic neuralology for synchronization acquisition, broadcast information acquisition, beam acquisition and beam estimation, and random access. If the terminal supports the case where the primary and secondary neutrals are used in parallel at the same time, the transceiver complexity of the terminal may increase.

Method A184 is a method in which a first set of signals can be transmitted via a basic neuralology and some or all of the first set of signals can also be transmitted through sub-neutrals. In order to support the initial access using the secondary neuronology of the terminal, all signals (or channels) constituting the first signal set must be able to be transmitted through the sub-neumerology. For example, assuming that the first signal set includes a downlink synchronization signal, a PBCH, a BRS, and a PRACH, all of the components of the first signal set may be transmitted through basic and sub-neumerology. . On the other hand, when the initial access of the terminal is possible only through the primary neuron and the secondary neuralology needs to be used for time-frequency synchronization tracking of the terminal in the RRC connected state, only a part of the first signal set serves It can be transmitted through the neural roller. For example, assuming that the first signal set is composed of a downlink synchronization signal, a PBCH, and a PRACH, the downlink synchronization signal is transmitted through the basic and sub-neuronal, and the PBCH and the PRACH are sent to the primary. Can only be sent via

When method A184 is used, some or all of the first set of signals may be sent for all subnumerics set on the NR carrier, or some of the subnumerics set on the NR carrier. The first signal set in which the basic neuronology is used is always fixedly transmitted, and the first signal set in which the sub-neuralology is used may or may not be transmitted according to the configuration of the base station.

According to the method A184, since the terminal may receive (and / or transmit) both the first signal set and the second signal set using only one sub-neural roller, the transmission / reception complexity may be lower than that of the method A183. On the other hand, since the first signal set has to be transmitted several times through different numerologies, the overhead of the control signal may increase. In addition, as a plurality of numerologies are applied to the transmission of the synchronization signal, the amount of information to be transmitted to the terminal through the synchronization signal may increase or the synchronization signal design may be complicated. In addition, suppose a case where a first signal set by heterogeneous neurology is transmitted on the same time interval. If the number of transceiver units (TXRUs) of the base station is small, when the transmission beams of the first signal set are formed, it may be difficult to accurately form beams in different directions for each of the numerologies.

On the other hand, when the method A184 is used in the first type NR carrier and all of the first signal set is also transmitted through the subneuronal, the terminal may initially connect to the NR carrier using the subnumeric. In this case, a method may be considered that does not allow the terminal to initially access using the subneuronal. That is, the first signal set (s) used for initial connection and the first signal set (s) not used for initial connection may be different from each other. May be sent by the base station. To this end, the synchronization signal for the primary neuron and the synchronization signal for the sub-neurology may be defined to be distinguished. For example, the sequence of the synchronization signal, resource element mapping, and the like may be defined differently for the basic and sub-neuronal. The UE knows the distinguishing element in advance, and can perform initial access through the basic neurology by detecting only a synchronization signal corresponding to the basic neurology during the initial access.

On the other hand, in the case of the first type NR carrier, a method of allowing the terminal to perform the initial access using the sub-neumerology may be considered. In this case, the terminal may need to know whether the neuron used by the terminal for initial access is a basic neuron or a subneuronal. The terminal may obtain the information of the neuronology type by receiving a downlink signal (or channel) of a first signal set. For example, the mapping (or sequence) of the downlink synchronization signal is defined differently for the basic and sub-neumerology, and the terminal performs blind detection for a plurality of mappings (or sequences) when receiving the synchronization signal. You can try For another example, the neuralology type information may be transmitted through a PBCH. In the case where the UE obtains the numerology obtained during the initial access process, the UE uses the sub-neumerology obtained during the initial access process as the primary neuralology, until the UE receives another neuralology from the base station. And operations (eg, PDCCH monitoring, data and pilot transmission and reception, CSI / RRM measurement and reporting).

On the other hand, in the case of the second type NR carrier, as described above, the terminal is allowed to perform the initial connection by using the subneuronal. At this time, the terminal does not need to know whether the neuron used by the terminal for initial access is a basic or sub-neumerology. Until the terminal receives another neurology from the base station, the following procedure and operations (eg, PDCCH monitoring, data and pilot transmission, CSI / RRM measurement and Report).

24 is a diagram of a computing device, in accordance with an embodiment of the present invention. The computing device TN100 of FIG. 24 may be a base station or a terminal described herein. Alternatively, the computing device TN100 of FIG. 24 may be a wireless device, a communication node, a transmitter, or a receiver.

In the embodiment of FIG. 24, 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 (20)

1. Generating a physical channel or a physical signal using a physical resource block (PRB) which is a frequency axis resource allocation unit; And

   Transmitting the physical channel or the physical signal,

   Subcarrier spacings for a plurality of numerologies are defined differently,

   The number of subcarriers belonging to the first PRB to which the first neuralology is applied among the plurality of numerologies is the number of subcarriers belonging to the second PRB to which the second neuralology is applied. Same as,

   The boundary of the first PRB is aligned with the boundary of the second PRB.

   Transmission method of the base station.
2. The method of claim 1,

   At least one of the subcarriers belonging to the first PRB is aligned with at least one of the subcarriers belonging to the second PRB.

   Transmission method of the base station.
3. The method of claim 1,

   The bandwidth of the first PRB is 2 ^N times (where N is an integer) of the bandwidth of the second PRB.

   Transmission method of the base station.
4. The method of claim 1,

   A first DC subcarrier for the first pneumonia and a second DC subcarrier for the second pneumonia exist

   Transmission method of the base station.
5. The method of claim 4, wherein

   The position of the first DC subcarrier is the same as the position of the second DC subcarrier.

   Transmission method of the base station.
6. The method of claim 1,

   The first neuralology is a neuralology applied to a downlink synchronization signal used for initial access among the plurality of neuralology,

   Based on the first PRB, the number of PRBs included in one carrier is an even individual regardless of system bandwidth.

   Transmission method of the base station.
7. Setting a physical resource block (PRB) group to the first terminal;

   Setting a neutralizer for a PRB group configured for the first terminal among a plurality of numerologies defined by subcarrier spacing and cyclic prefix length, to the first terminal; And

   Scheduling at least one PRB among a plurality of PRBs included in a PRB group configured for the first terminal, to the first terminal

   Scheduling method of the base station comprising a.
8. The method of claim 7, wherein

   The plurality of PRBs included in the PRB group configured for the first terminal may be continuous on the frequency axis.

   Scheduling method of the base station.
9. The method of claim 7, wherein

   A plurality of PRB groups configured for the first terminal, the plurality of PRB groups include a first PRB group and a second PRB group,

   The setting of the neutralizer to the first terminal may include:

   Setting a first neuronage for the first PRB group among the plurality of neuronologies to the first terminal; And

   Setting a second neuronage for the second PRB group among the plurality of neuronologies to the first terminal;

   Scheduling method of the base station.
10. The method of claim 7, wherein

    A plurality of PRB groups configured for the first terminal, and the plurality of PRB groups include a first PRB group and a second PRB group scheduled to the first terminal through the same downlink control information (DCI),

    When the same neuralology is applied to the first PRB group and the second PRB group, an index given to the last PRB among a plurality of PRBs included in the first PRB group is included in the second PRB group. The same index given to the last PRB of the plurality of PRBs

    Scheduling method of the base station.
11. The method of claim 7, wherein

    A plurality of PRB groups configured for the first terminal, and the plurality of PRB groups include a first PRB group and a second PRB group scheduled to the first terminal through the same downlink control information (DCI),

    When the same neuralology is applied to the first PRB group and the second PRB group, the indexes assigned to the plurality of PRBs included in the second PRB group are a plurality of PRBs included in the first PRB group. Based on the index given to the last PRB

    Scheduling method of the base station.
12. The method of claim 7, wherein

    Transmitting a PRB bundle index indicating a PRB bundle including the at least one PRB to the first terminal through downlink control information (DCI);

    The scheduling method of the base station further comprising.
13. The method of claim 7, wherein

    The number of PRBs included in the PRB group set to the first terminal is determined according to the neuralology applied to the PRB group set to the first terminal.

    Scheduling method of the base station.
14. The method of claim 7, wherein

    Setting a PRB group different from the PRB group configured for the first terminal to the second terminal; And

    Setting a numerology different from the neuralology for the PRB group set to the first terminal among the plurality of neuralologies to the second terminal for the PRB group set to the second terminal;

    The scheduling method of the base station further comprising.
15. The method of claim 7, wherein

    The plurality of numerologies include a first neuralology and a second neuralology,

    The number of PRBs included in the first PRB group to which the first pneumoroller is applied is the same as the number of PRBs included in the second PRB group to which the second pneumonology is applied.

    Scheduling method of the base station.
16. Generating a first downlink synchronization signal used for initial access; And

    Transmitting the first downlink synchronization signal,

    The first sequence set for the first downlink sync signal is different from the second sequence set for the second downlink sync signal used for a different purpose than the initial connection.

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

    Generating the first downlink synchronization signal,

    Generating the first downlink synchronization signal using a second polynomial different from a first polynomial for the second downlink synchronization signal;

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

    Generating the first downlink synchronization signal,

    Generating the first downlink synchronization signal by using the same polynomial as the polynomial for the second downlink synchronization signal and a cyclic shift value different from the cyclic shift value for the second downlink synchronization signal; Containing

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

    Transmitting the second downlink synchronization signal through a first neuron among a plurality of numerologies defined by a subcarrier spacing and a cyclic prefix length;

    Transmitting the first downlink synchronization signal,

    Transmitting the first downlink synchronization signal through the first neural mechanism;

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

    Transmitting the second downlink synchronization signal through a first neuron among a plurality of numerologies defined by a subcarrier spacing and a cyclic prefix length;

    Transmitting the first downlink synchronization signal,

    Transmitting the first downlink synchronization signal through a second neurology different from the first neurolography among the plurality of neurolologies;

    Transmission method of the base station.

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