WO2017192019A1 - Method for obtaining information on numerologies in wireless communication system and device therefor - Google Patents

Abstract

A method for obtaining information on numerologies in a wireless communication system supporting multiple numerologies and a device therefor are disclosed. Particularly, the method for a terminal to obtain information on numerologies in a wireless communication system supporting multiple numerologies may comprise: a step of receiving, from a base station, a first synchronization signal and a second synchronization signal which use a default numerology among multiple numerologies; a step of obtaining synchronization with the base station on the basis of the received first synchronization signal and second synchronization signal; and a step of receiving, from the base station, information on the remaining numerologies via at least one of a predetermined signal and a predetermined channel which use the default numerology.

Description

Method for acquiring information about neurology in a wireless communication system and apparatus therefor

The present invention relates to a wireless communication system supporting a plurality of numerologies, and more particularly, to a method for a terminal to obtain information on a specific numerology among a plurality of numerologies, and an apparatus for supporting the same.

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

The requirements of the next generation of mobile communication systems will be able to accommodate the explosive data traffic, dramatically increase the data rate per user, greatly increase the number of connected devices, very low end-to-end latency, and high energy efficiency. It should be possible. Dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Various technologies such as wideband support and device networking have been studied.

The present specification proposes a method for a terminal to perform synchronization on time / frequency using a default numerology in a wireless communication system supporting a plurality of numerologies.

More specifically, the present invention proposes a method for a terminal to perform synchronization on another numerology corresponding to a service (or system) desired to use by using the default numerology.

In addition, the present specification, a method for obtaining information on the numerology corresponding to the service that the terminal wants to use through a synchronization signal (for example, SSS) or a physical channel (for example, PBCH, PDSCH) set as the default numerology Suggest.

In addition, the present specification proposes a method of checking whether the time / frequency synchronization set for the default numerology is maintained for other numerology through an additional reference signal.

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

In a method of obtaining information on numerology by a terminal in a wireless communication system supporting a plurality of numerologies according to an embodiment of the present invention, the method may include: using a default numerology among the plurality of numerologies; Receiving a first synchronization signal and a second synchronization signal from a base station, acquiring synchronization with the base station based on the received first synchronization signal and a second synchronization signal, and specifying a specific signal using the default numerology or And receiving information on the remaining numerology from the base station through at least one of a specific channel, wherein the remaining numerology is a numerology excluding the default numerology among the plurality of numerologies, the first synchronization signal and the second The synchronization signal and the specific channel are transmitted through different time resources, respectively. numerology of the number are each set to a different frequency resource in the frequency domain resources by the base station support.

Also, in an embodiment of the present disclosure, the information on the remaining numerology may include at least one of subcarrier spacing or the number of symbols corresponding to the remaining numerology.

In addition, in an embodiment of the present disclosure, the information on the remaining numerology may be determined based on an offset between a position at which the specific signal is transmitted and a position at which the specific channel is transmitted.

Further, in an embodiment of the present disclosure, the method may further include receiving, from the base station, a reference signal for determining whether the synchronization value for the default numerology and the synchronization value for the remaining numerology match. Can be.

In addition, in one embodiment of the present invention, the reference signal may be received through some resources of the downlink control channel region set according to the remaining numerology.

In an embodiment, the second synchronization signal may include a secondary synchronization signal, and the specific channel may include a physical channel or system information including a master information block. It may include one of physical channels including a block (system information block).

In an embodiment of the present disclosure, at least one of the second synchronization signal or the specific channel may include information indicating the remaining numerology.

Also, in an embodiment of the present disclosure, when a plurality of indices corresponding to the plurality of numerologies are preset, the information indicating the remaining numerology includes an index corresponding to the remaining numerology among the plurality of indices. can do.

Also, in an embodiment of the present disclosure, when the second synchronization signal includes information indicating the remaining numerology, the specific channel may be received according to the remaining numerology.

In addition, in an embodiment of the present disclosure, when the second synchronization signal does not include information indicating the remaining numerology, the specific channel may be received according to the default numerology.

A terminal for acquiring information on numerology in a wireless communication system supporting a plurality of numerologies according to another embodiment of the present invention, the terminal includes a transceiver for transmitting and receiving a radio signal and a functional unit with the transceiver; It includes a processor connected to. Here, the processor is configured to receive a first synchronization signal and a second synchronization signal from the base station using a default numerology among the plurality of numerologies, and based on the received first synchronization signal and the second synchronization signal. Acquiring and synchronizing with each other, and receiving information on the remaining numerology from the base station through at least one of a specific signal or a specific channel using the default numerology, wherein the remaining numerology is the default among the plurality of numerology. numerology excluding numerology, wherein the first synchronization signal, the second synchronization signal, and the specific channel are transmitted through different time resources, and the plurality of numerologies are different frequency resources in a frequency resource region supported by the base station Is set to.

According to an embodiment of the present invention, since the terminal acquires information on the numerology corresponding to the service that the terminal wants to use by using the preset default numerology, the terminal can efficiently access the corresponding service.

In addition, according to an embodiment of the present invention, as the terminal performs synchronization with a base station using a preset default numerology in a wireless communication system supporting a plurality of numerologies, the synchronization operation is not performed for all numerologies, respectively. The overhead for may be reduced.

In addition, according to an embodiment of the present invention, through additional reference signals transmitted from the base station, synchronization (eg, time / frequency synchronization) set according to the default numerology is more precisely when the terminal uses different numerology. Can be maintained.

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

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

1 is a view showing an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

2 shows an example of a self-contained subframe structure to which the present invention can be applied.

3 shows an example of a structure in which different numerologies to which the present invention can be applied coexist in an FDM scheme.

4 shows another example of a structure in which different numerologies to which the present invention can be applied coexist in an FDM scheme.

5A and 5B illustrate examples in which reference signals for maintaining synchronization are included in a structure in which different numerologies coexist with the FDM scheme to which the present invention can be applied.

6 shows an example of a structure in which different numerologies to which the present invention can be applied coexist in a TDM manner.

7 shows another example of a structure in which different numerologies to which the present invention can be applied coexist in a TDM manner.

8A and 8B illustrate examples in which reference signals for maintaining synchronization are included in a structure in which different numerologies coexist in a TDM scheme to which the present invention can be applied.

9 is a flowchart illustrating an operation of a terminal for obtaining information on numerology in a wireless communication system supporting a plurality of numerologies to which the present invention can be applied.

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

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention.

In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), and the like. . In addition, a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.

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

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The following techniques are code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and NOMA It can be used in various radio access systems such as non-orthogonal multiple access. CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

For clarity, the following description focuses on 3GPP LTE / LTE-A, but the technical features of the present invention are not limited thereto.

As the spread of smart phones and IoT (Internet of Things) terminals is rapidly spreading, the amount of information exchanged through a communication network is increasing. As a result, next-generation wireless access technologies can provide faster service to more users than traditional communication systems (or traditional radio access technologies) (e.g., enhanced mobile broadband communication). )) Needs to be considered. To this end, a design of a communication system considering a machine type communication (MTC) that provides a service by connecting a plurality of devices and objects has been discussed. In addition, a design of a communication system (eg, Ultra-Reliable and Low Latency Communication (URLLC)) that considers a service and / or terminal sensitive to communication reliability and / or latency is also considered. In the following description, for convenience of description, the next generation radio access technology is referred to as NR (New Radio Access Technology), and the radio communication system to which the NR is applied is referred to as an NR system.

System general

1 is a view showing an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

Referring to Figure 1, the NG-RAN consists of gNBs that provide control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and UE (User Equipment). do.

The gNBs are interconnected via an X _n interface.

The gNB is also connected to the NGC via an NG interface.

More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.

NR (New Rat) Numerologies  And frame structure

Numerology is supported in NR. Numerology is defined by subcarrier spacing and CP overhead. Multiple subcarrier spacings can be derived by scaling the basic subcarrier spacing to an integer N. The numerology used can be chosen independently of the frequency band, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies. In this case, flexible network and UE channel bandwidths are supported.

In terms of the RAN1 specification, the maximum channel bandwidth per NR carrier is 400 MHz. For at least single numerology, the candidate of the maximum number of subcarriers per NR carrier is 3300 or 6600 in view of the RAN1 specification.

The sub frame duration is fixed at 1 ms and the frame length is 10 ms. Scalable numerology should allow for subcarrier spacing of at least 15 kHz to 480 kHz. All numerologies with large subcarrier spacings of 15 kHz or more, regardless of CP overhead, are aligned at symbol boundaries every 1 ms of NR carrier.

More specifically, the general CP sequence is selected as follows.

-If the subcarrier spacing is 15 kHz * 2 ⁿ (n is a nonnegative integer),

Each symbol length (including CP) of the 15 kHz subcarrier interval is equal to the sum of the corresponding 2 ⁿ symbols of the scaled subcarrier interval.

In addition to the first OFDM symbol at every 0.5 ms, all OFDM symbols within 0.5 ms have the same size.

The first OFDM symbol in 0.5 ms is as long as 16 Ts (assuming FFT sizes of 15 kHz and 2048) compared to other OFDM symbols.

16Ts are used in the CP for the first symbol.

-If the subcarrier spacing is 15 kHz * 2 ⁿ (n is a negative integer)

Each symbol length (including CP) of the subcarrier spacing is equal to the sum of the corresponding 2 ⁿ symbols of 15 kHz.

A resource defined by one subcarrier and one symbol is called a resource element (RE).

Physical layer design supports extended CP. An extended CP is only one in a given subcarrier interval. LTE scaled extended CP is supported at least 60kHz subcarrier spacing. The CP type may be configured semi-static using UE-specific signaling. The UE supporting the extended CP may depend on the UE type / capability.

The number of subcarriers per PRB is twelve. The explicit DC subcarrier is not reserved for both downlink and uplink. For the DC present in the transmitter, the DC processing of the DC subcarrier at the transmitter side is defined as follows.

The receiver knows where the DC subcarrier is, or where it is known (eg by spec or signaling), or whether the DC subcarrier is not within the receiver bandwidth.

For the downlink, the UE may assume that the DC subcarrier transmitted at the transmitter (gNB) side is modulated. That is, data is not rate-matched or puncturized.

In the case of uplink, the DC subcarrier transmitted from the transmitter (UE) side is modulated, that is, data is not rate-matched or puncturing.

For uplink, the transmitter DC subcarrier on the transmitter (UE) side should avoid collision with at least DMRS if possible.

For uplink, at least one specific subcarrier must be defined as a candidate position of a DC subcarrier. For example, the DC subcarrier is located at the boundary of the PRB.

For uplink, means must be specified for the receiver to determine the DC subcarrier position.

-It is associated with the semi-static signaling from the UE and the DC subcarrier location described in the standard.

If there is no DC subcarrier, all subcarriers in the receiver bandwidth are transmitted.

On the other hand, on the receiver side, no special handling of DC subcarriers at the receiver side is specified in RAN1. Operation remains implementation, i.e., the receiver may puncturing the data received on the DC subcarrier, for example.

Slots are defined as 7 or 14 OFDM symbols for the same subcarrier interval up to 60 kHz with normal CP and 14 OFDM symbols with the same subcarrier interval higher than 60 kHz with normal CP.

The slot may include all downlinks, all uplinks, or at least one downlink portion and at least one uplink portion. Slot aggregation is supported, i.e., data transmission can be scheduled in one or multiple slot intervals.

In addition, mini-slots having the following lengths are defined.

Minislots with at least 6 GHz and 1 symbol in length are supported.

Lengths from length 2 to slot length -1

-At least two URLLCs are supported.

When designing slot-level channels / signals / procedures, consider the following:

Possible occurrence of mini slot / slot transmission (s) occupying resources scheduled for ongoing slot transmission (s) of a given carrier for the same / different UEs.

At least one of the DMRS format / structure / configuration for the slot level data channel is reused for the mini slot level data channel.

At least one of the DL control channel format / structure / configuration for slot level data scheduling is designed to be applicable to mini slot level data scheduling.

At least one of the UL control channel formats / structures / configurations for slot level UCI feedback is designed to be applied to mini slot level UCI feedback.

Consider the following use case to design a mini slot.

Very low latency support including URLLC for specific slot lengths

The target slot length is at least 1 ms and 0.5 ms.

In particular, when TXRP uses beam-sweeping (eg 6 GHz or more), it supports more granular TDM granularity for the same or different UEs in the slots.

NR-LTE co-existence

Forward compatibility for unlicensed spectrum operation;

Self-contained subframe structure

The TDD (Time Division Duplexing) structure considered in the NR system is a structure that processes both uplink (UL) and downlink (DL) in one subframe. This is to minimize latency of data transmission in the TDD system, and the structure is referred to as a self-contained subframe structure.

2 shows an example of a self-contained subframe structure to which the present invention can be applied. 2 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 2, as in the case of legacy LTE, it is assumed that one subframe includes 14 orthogonal frequency division multiplexing (OFDM) symbols.

In FIG. 2, an area 202 means a downlink control region, and an area 204 means an uplink control region. Also, an area other than the area 202 and the area 204 (that is, an area without a separate indication) may be used for transmitting downlink data or uplink data.

That is, uplink control information and downlink control information are transmitted in one self-contained subframe. On the other hand, in the case of data, uplink data or downlink data is transmitted in one self-contained subframe.

When using the structure shown in FIG. 2, within one self-contained subframe, downlink transmission and uplink transmission may proceed sequentially, and transmission of downlink data and reception of uplink ACK / NACK may be performed. .

As a result, when an error in data transmission occurs, the time required for retransmission of data can be reduced. In this way, delays associated with data delivery can be minimized.

In the self-contained subframe structure as shown in FIG. 2, a base station (eNodeB, eNB, gNB) and / or terminal (user equipment (UE)) switches from a transmission mode to a reception mode. A time gap is required for the process or the process of switching from the reception mode to the transmission mode. In relation to the time gap, when uplink transmission is performed after downlink transmission in the self-contained subframe, some OFDM symbol (s) may be set to a guard period (GP).

analog Beamforming (analog beamforming )

In a millimeter wave (mmWave, mmW) communication system, as the wavelength of a signal is shortened, multiple (or multiple) antennas may be installed in the same area. For example, in the 30CHz band, the wavelength is about 1cm, and when the antennas are installed at 0.5 lambda intervals on a panel of 5cm x 5cm according to the 2-dimension arrangement, a total of 100 Antenna elements may be installed.

Accordingly, in the mmW communication system, a method of increasing coverage or increasing throughput may be considered by increasing beamforming (BF) gain using a plurality of antenna elements.

At this time, when a TXRU (Transceiver Unit) is installed to enable transmission power and phase adjustment for each antenna element, independent beamforming is possible for each frequency resource.

However, the method of installing TXRU in all antenna elements (eg, 100 antenna elements) may be ineffective in terms of price. Accordingly, a method of mapping a plurality of antenna elements to one TXRU and controlling the direction of the beam by using an analog phase shifter may be considered.

Since the analog beamforming method as described above can generate only one beam direction in all bands, a problem arises in that the frequency selective beam operation cannot be performed.

Accordingly, hybrid beamforming with B TXRUs, which is less than Q antenna elements, may be considered as an intermediate form between digital beamforming and analog beamforming. In this case, although there is a difference depending on the connection scheme of the B TXRU and Q antenna elements, the direction of the beam capable of transmitting signals at the same time may be limited to B or less.

The present invention proposes a method of designing a synchronization signal that can be used when considering a frame structure in which two or more different numerologies exist simultaneously at the same frequency or at the same time point. In the present specification, numerology may mean a subcarrier spacing, the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, a subframe duration, and the like.

In a 5G system or an NR system, multiple numerologies coexist, that is, different numerologies may be used depending on a service.

Here, the case where two or more different numerologies co-exist may mean various cases that may occur based on existing legacy LTE and / or NR systems.

For example, if multiple numerologies coexist, the legacy LTE system with subcarrier spacing set to 15KHz (i.e. 4G system) and subcarrier spacing set to other than 15KHz (e.g. 30KHz, 60KHz, etc.) This may mean a case where an NR system (ie, a 5G system) coexists.

For example, when multiple numerologies coexist, other services that use different subcarrier spacings within the NR system (e.g. Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low Latency Communication (URLLC), Machine Type Communication)) may coexist. More specifically, based on the characteristics of the service, the numerology and general (or long) symbol duration for URLLC services that require short symbol duration and / or subframe duration and Numerology for the eMBB service and / or numerology for the mMTC service may coexist.

In one example, the eMBB / mMTC service and the URLLC service may be provided through different numerologies.

For another example, the case where a plurality of numerologies coexist may mean a case where numerologies that are set differently according to data characteristics coexist in a specific service (eg, URLLC, eMBB, mMTC) supported by the NR system.

Specifically, numerology for data transmission requiring urgency and numerology for data transmitted periodically may coexist.

In addition, services supported at 6GHz and above may use larger numerologies than services supported at below 6GHz.

Hereinafter, in the present specification, for the convenience of description, it is assumed that a case where a plurality of numerologies coexist is a case where a plurality of services using different numerologies coexist.

Also, in the present specification, a physical signal and / or a physical channel used in a system in which two or more different numerologies can coexist is added with 'x-' to distinguish it from a legacy LTE system. Primary Synchronization Signal (x-PSS), Secondary Synchronization Signal (x-SSS), Physical Broadcast Channel (x-PBCH), Physical Downlink Control Channel (xPDCCH) / Enhanced PDCCH (x-EPDCCH), Physical Downlink (x-PDSCH) Shared Channel) or the like.

In addition, the synchronization signal (Synchronization Signal, SS) contemplated herein refers to signals used by the terminal to perform synchronization (x-PSS, x-SSS, and / or x-PBCH).

The following two methods may be considered as a method of designing a synchronization signal when two or more different numerologies coexist as described above.

First, a method of transmitting different synchronization signals for each numerology may be considered. However, in this case, the overhead for synchronization, that is, the synchronization overhead (sync overhead) in the system side may be large, and the decoding complexity of the synchronization signal of the terminal may be large.

Secondly, one specific numerology among a plurality of numerologies, ie, a default numerology, between a UE and a base station eNB is set through a predetermined method (or predefined), and the default numerology Accordingly, a method of transmitting a synchronization signal may be considered.

In the case of using the synchronization signal according to the default numerology, compared to the first method, there is an advantage that the decoding complexity of the synchronization signal on the terminal side is low, and the synchronization overhead is small on the system side. Accordingly, the present invention proposes a method of using a synchronization signal according to the default numerology.

In this case, the default numerology for the transmission of the synchronization signal may be independently determined according to a frequency band (for example, a band of 6 GHz or less and a millimeter wave (mmWave) of 6 GHz or more).

In addition, the default numerology may be set so that the terminal can identify (or confirm) through blind decoding. In this case, in order to reduce the number of times of performing the blind decoding, candidate (s) for which different values may be received for each default numerology may be preset. For example, if there are two candidates for the default numerology (the first default numerology, the second default numerology), the channel raster set is set to two and mapped to each numerology (for example, the first default numerology). A channel raster value of 100 kHz, a channel raster value of 300 kHz for a second default numerology).

Numerologies using several different subcarrier spacings coexist when frequency division multiplexing (FDM) coexists and time division multiplexing (TDM) coexists. It can be divided into the case.

Hereinafter, a method of designing a synchronization signal for a case where two or more different numerologies coexist in the FDM scheme and in the TDM scheme will be described in detail.

In addition, hereinafter, the embodiments are divided for convenience of description, and each embodiment may be implemented in combination with each other or independently.

(1) different numerology  Synchronization signal design method based on default numerology when coexisting with FDM method

As described above, different numerologies may be used in different sub-bands at the same time. To this end, a sub-band filtering technique such as f-OFDM (filtered OFDM) may be required.

3 shows an example of a structure in which different numerologies to which the present invention can be applied coexist in an FDM scheme. 3 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 3, the SS and the PBCH are transmitted in the FDM scheme in the interval 302 (that is, the interval from time t _{0 to} time t _j ) where the default numerology is used, and the SSs (eg, PSS and SSS) shown in FIG. 3 are transmitted. And PBCH mean x-SS (eg, x-PSS, x-SSS) and x-PBCH, respectively.

Further, it is assumed that three different numerologies (that is, the first numerology 304, the second numerology 306, and the third numerology 308) coexist from the time point t _j . Here, the first numerology 304 is used in the sub band f _i , the second numerology 306 is used in the sub band f _j , and the third numerology 308 is used in the sub band f _k .

In this case, the synchronization signals (eg, x-PSS, x-SSS, etc.) and x-PBCH transmitted at the time t ₀ (that is, the interval 302) are used in the subband f _i , that is, the second numerology 306. It is set to be transmitted using the subcarrier interval corresponding to. In other words, the second numerology 306 is set as the default numerology (ie, the default numerology used in the interval 302) for transmission of the synchronization signal and the broadcasting signal of the current system.

Accordingly, terminals wishing to access a corresponding base station (e.g., initial access) may use a subcarrier interval corresponding to a default numerology that is previously promised (e.g., identified through blind decoding, preset in the system). Synchronization may be obtained and blind decoding may be performed on the x-PBCH.

At this time, each terminal is information (for example, numerology information, subcarrier interval, time duration, number of symbols used in each subband to which the service that it wants to use (or receive) is transmitted And the like) may be configured to receive from the base station.

3 is a diagram illustrating information related to a service desired to be used by the terminal, that is, information on a first numerology 304, a second numerology 306, and / or a third numerology 308 used after a time point t _j is transmitted; An example of transmission through PBCH (ie, MIB (Master Information Block) of x-PBCH) is shown.

However, this is for convenience of description, and information related to a service that the terminal wants to use is not only x-PBCH but also x-SSS, System Information Block (SIB) of x-PDSCH, and / or x-SSS and x- It may be transmitted through the relative position of the PBCH. In addition, the terminal, after the initial access process, through the RRC (Radio Resource Control) or the like according to the UE capability (UE capability) or the connection state requested to configure the setting of the information related to the service It may be reconfigured or may receive information on subbands and numerology.

Hereinafter, for each of the above-mentioned cases (x-SSS, MIB of x-PBCH, SIB of x-PDSCH, and relative position of x-SSS and x-PBCH) related to the service that the terminal wants to use The operation of the base station (that is, the transmission operation) and the operation of the terminal (that is, the operation after reception and reception) for the transmission of the information will be described in detail.

1) When service related information that the terminal wants to use is transmitted through x-SSS

The base station needs to inform the terminal of information about the subbands allocated for the services provided by the current system and the numerology used in the corresponding subbands. In other words, information to be transmitted for each service (that is, information related to a service that the terminal wants to use) should include subcarrier intervals and subbands (mandatory), the number of OFDM symbols per subframe, and transmission time. The length of the interval may be additionally included.

In this case, the information may be represented by n bits according to the total number of numerologies supported by the system. For example, when the total number of numerology is 4, the information may be represented by 2 bits. In addition, when the number of information to be transmitted per numerology is N, the information may be represented by N * n bits (N * n bits).

Alternatively, the information may be transmitted by setting a table composed of n bits according to the number of numerology, and confirming information previously promised according to the transmitted index. For example, when there are a plurality of sequences (for example, a first sequence and a second sequence) used to generate the x-SSS, a relationship in which the plurality of sequences are mapped to different numerology in the form of a table is shown. Can be set. More specifically, a setup in which a first sequence is mapped to a first numerology 304 and a second sequence is mapped to a second numerology 306 may be considered. In this case, the base station may transmit the x-SSS configured using the second sequence to the terminal in order to provide information about a service for which the second numerology 306 is used. In this case, the table may be transmitted through signaling (eg, higher layer signaling) between the base station and the terminal or may be preset in the system.

Accordingly, the base station transmits an x-SSS including additional information (i.e., information increased by the size mentioned above), and the terminal decodes the received x-SSS to a service that it wants to use. Information on applied subbands and numerology can be obtained.

According to the above-described scheme, synchronization signals such as x-PSS and x-SSS are transmitted according to the default numerology, and the signals / channels transmitted after x-PBCH and subsequent services are transmitted to the corresponding service according to the numerology used for each service. It can be transmitted on the used subband.

In this case, additional x-PBCH transmissions other than the x-PBCH transmitted through the default numerology and / or the default service may exist for each use case or other numerology. At this time, the frequency / time resource of the additional x-PBCH existing for each different numerology is the x-PBCH for the default numerology, the cell identifier (Cell Identifier, Cell ID), and the system frame number (System Frame Number). , SFN) or the like can be determined.

In addition, additional information based on numerology obtained through x-SSS may be delivered using MIB of x-PBCH. For example, when the UE recognizes that the number of OFDM symbols per subframe is N through numerology previously known, 'the downlink control channel (for example, PDCCH) of the current subband is N 1 / May be transmitted in a period of 2 or 1/3 '.

2) x- Of PBCH MIB  When service related information that the terminal wants to use is transmitted through

As in the case of 1) described above, the information transmitted from the base station to the terminal may be represented by n bits according to the total number of numerologies supported by the system, and when the number of information to be transmitted per numerology is N, The information may be represented by N * n bits. Alternatively, the information may be transmitted by setting a table composed of n bits according to the number of numerology, and confirming pre-appointed information according to the index transmitted by the terminal.

Accordingly, the base station transmits a MIB including additional information (i.e., the information increased by the size mentioned above), and the terminal decodes the received x-PBCH to apply the subband and numerology to the service that it wants to use. Obtain information about.

According to the above-described scheme, x-PSS, x-SSS, and up to x-PBCH are transmitted according to the default numerology, and the signals / channels transmitted after x-PDCSH and subsequent services according to the numerology used for each service It may be transmitted through a subband used for.

In addition, additional information may be transmitted together with numerology information using the MIB of the x-PBCH. For example, when the UE recognizes that the number of OFDM symbols per subframe is N through the numerology transmitted together, 'the downlink control channel (for example, PDCCH) of the current subband is N 1/2 or 1/3 May be transmitted in a period of '.

3) x- PDSCH  When service related information that the terminal wants to use is transmitted through SIB

As in the case of 1) and 2) described above, the information transmitted from the base station to the terminal may be represented by n bits according to the total number of numerologies supported by the system, and the number of information to be transmitted per N numerology is N In this case, the information may be represented by N * n bits. Alternatively, the information may be transmitted by setting a table composed of n bits according to the number of numerology, and confirming pre-appointed information according to the index transmitted by the terminal.

Accordingly, the base station transmits an SIB including additional information (i.e., information increased by the size mentioned above), and the terminal decodes the received x-PDSCH and subbands and numerology applied to the service that it wants to use. Obtain information about.

According to the above scheme, x-PSS, x-SSS, x-PBCH, and up to x-PDSCH for SIB transmission are transmitted according to the default numerology, and the signal / channel transmitted for x-PDCSH and thereafter for data transmission. They may be transmitted through the subbands used for the corresponding service according to the numerology used for each service.

4) x- With SSS  x- Of PBCH  When service related information that the terminal wants to use is transmitted according to the relative position

Rather than adding information directly to the x-SSS, x-PBCH, or x-PDSCH to convey service-related information, it indicates specific numerology using the relative position between the x-SSS and the x-PBCH. The method can be considered.

If the number of numerologies supported by the base station is N, the x-PBCH may be set to be located in N different resources (or regions) from the x-SSS on the frequency axis and / or time axis. In other words, the transmission position of the x-PBCH may be set using N different offsets based on the transmission position of the x-SSS. In this case, N offsets may be mapped to N numerologies in a one-to-one relationship. Such a mapping relationship may be previously set on the system or may be delivered to the terminal through signaling between the base station and the terminal (eg, higher layer signaling).

Accordingly, the base station may transmit the x-PSS and the x-SSS using the default numerology, and transmit the x-PBCH through the subbands used for the corresponding service according to the numerology used for each service. At this time, the terminal checks the synchronization and the cell identifier through the received x-PSS and x-SSS, and knows in advance the numerology used according to the frequency difference between the band and each sub-band transmitted by the x-SSS Assuming that the terminal can decode the x-PBCH for a subband corresponding to a service to be used.

Additionally, additional information based on numerology previously obtained using the MIB of the x-PBCH may be delivered. For example, when the UE recognizes that the number of OFDM symbols per subframe is N through numerology previously known, 'the downlink control channel (for example, PDCCH) of the current subband is N 1 / May be transmitted in a period of 2 or 1/3 '.

In the above-described method, the case where x-PSS, x-SSS, and x-PBCH and the like are transmitted in the FDM scheme is considered. Alternatively, the case where x-PSS, x-SSS, and x-PBCH, etc., are transmitted in the TDM scheme may also be considered.

4 shows another example of a structure in which different numerologies to which the present invention can be applied coexist in an FDM scheme. 4 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 4, the PSS, SSS, and PBCH are transmitted in a TDM scheme in the interval 402 (that is, the interval from time t _{0 to} time t _j ) in which default numerology is used, and the PSS, SSS, and PBCH means x-PSS, x-SSS, and x-PBCH, respectively.

In addition, the first numerology 404, the second numerology 406, and the third numerology 408 correspond to the first numerology 304, the second numerology 306, and the third numerology 308 of FIG. 3, respectively. In addition, as shown in FIG. 3, the second numerology 406 corresponds to a default numerology for transmission of a synchronization signal and a broadcasting signal of the current system.

A method of transmitting service-related information that the UE wants to use through the x-SSS, the MIB of the x-PBCH, or the SIB of the x-PDSCH (that is, a sync signal and a PBCH are transmitted in an FDM scheme) 2 ), Or 3) may be similarly applied to the case where x-PSS, x-SSS, and x-PBCH are transmitted in the TDM scheme.

However, in the case of transmitting the information according to the relative position between x-SSS and x-PBCH described above (that is, in case of 4 described above), x-PSS, x-SSS, and x-PBCH may be used as TDM. It may be applied differently when transmitted in a manner. That is, when the base station of the current cell supports a total of N services using different numerologies, the information is determined according to a relationship between timing of transmitting x-SSS and timing of transmitting x-PBCH. A method of delivering to the terminal may be considered.

More specifically, when the base station transmits a signal using different numerologies for N services, x-SSS is transmitted at an arbitrary timing using the default numerology, and default numerology is applied at N different timings. Used x-PBCH may be transmitted respectively. At this time, the UE performs x-PBCH blind decoding on the location where the x-PBCH can be transmitted, and through this, the UE can determine the number of numerology and the number of services used by the corresponding cell. Information can be obtained.

In this case, it may be considered that the numerology information for each service is included in the MIB transmitted on the corresponding x-PBCH according to the timing of the x-PBCH. This configuration may be set in advance on the system, or may be delivered to the terminal through signaling between the base station and the terminal (eg, higher layer signaling), whereby the terminal receives the x-PBCH transmitted at a specific timing. By decoding, numerology information corresponding to a desired service can be obtained.

According to the above-described procedures, after the terminal receives information on the subband (that is, numerology information used in the corresponding subband) in which the service that the user wants to use is transmitted from the base station, the terminal uses the service. In order to move to the corresponding subband. The mobile station moving to the corresponding subband may be configured to retune time / frequency synchronization again at subcarrier intervals according to numerology used in the corresponding subband, and then receive a downlink control channel.

In this case, there is a need for a method for checking whether a frequency / time synchronization value obtained through a subband using default numerology is maintained even in a subband to which the terminal has moved. That is, it is necessary to consider a method that can determine whether the frequency / time synchronization value obtained using the default numerology is applied to other subbands providing services as it is.

To this end, in each subband, a reference signal (eg, a tracking reference signal (TRS)) used to maintain frequency / time synchronization may be additionally transmitted. In this case, the reference signal may be transmitted at a longer period than the synchronization signal (ie, a signal transmitted using default numerology). The structure in which the reference signal is additionally transmitted may be the same as that of FIGS. 5A and 5B.

5A and 5B illustrate examples in which reference signals for maintaining synchronization are included in a structure in which different numerologies coexist with the FDM scheme to which the present invention can be applied. 5A and 5B are merely for convenience of description and do not limit the scope of the present invention.

Referring to FIG. 5A, in comparison with FIG. 3, a reference signal for maintaining synchronization, that is, a TRS (or T-RS) 503, may be preset (commitment) among regions in which a downlink control channel / signal is transmitted. It is assumed that the case is additionally transmitted in a specific area (i.e., a specific resource unit) determined according to a predetermined period and / or a predetermined position. In this case, the reference signal transmitted in each subband may be transmitted based on a subcarrier interval according to numerology used in the corresponding subband.

For example, in FIG. 5A, the TRS for the first numerology is transmitted in the region 505 set based on the subcarrier spacing according to the first numerology, and the TRS for the second numerology is sent to the subcarrier spacing according to the second numerology. And is transmitted based on the region 507 set based on the subcarrier interval according to the third numerology.

Referring to FIG. 5B, the operation of the base station / terminal in FIG. 5B is the same as that described in FIG. 5A except for the operation in the interval 502 where the default numerology is used.

In detail, in FIG. 5A, the SS (for example, PSS and SSS) and the PBCH are transmitted in the FDM scheme in the interval 501 in which the default numerology is used. In FIG. 5B, in the interval 502 in which the default numerology is used, the PSS, SSS, And PBCH is transmitted in a TDM manner. SS (eg, PSS, SSS) and PBCH shown in FIGS. 5A and 5B mean x-SS (eg, x-SSS, x-PSS) and x-PBCH, respectively.

(2) different numerology  Synchronization Signal Design Method Based on Default Numerology in case of TDM Coexistence

Unlike what is described in (1), different numerologies can be used at different timings within the same band (ie, frequency). In other words, the case where different numerologies coexist in the TDM scheme within the same band may be considered.

6 shows an example of a structure in which different numerologies to which the present invention can be applied coexist in a TDM manner. 6 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 6, in a period 602 (that is, a period from time t _{0 to} time t _i ) in which default numerology is used, SS and PBCH are transmitted in an FDM scheme, and SS and PBCH shown in FIG. 6 are x-SS, respectively. And x-PBCH.

In this case, synchronization signals such as the PBCH and the SS may be transmitted using a subcarrier interval corresponding to a default numerology (that is, a default numerology preset in a system or through signaling). In other words, in each period in which synchronization signals such as the PBCH and the SS are transmitted, a signal may be transmitted in a corresponding subband through a subframe set based on a subcarrier interval corresponding to a default numerology.

In addition, it is assumed that three different numerologies (that is, the first numerology 604, the second numerology 606, and the third numerology 608) coexist with different transmission timings of subframes within the same band. Here, the first numerology 604 is used for the subframe at time t _i , the second numerology 606 is used for the subframe at time t _j , and the third numerology 608 is used for the subframe at time t _k Is used for.

When synchronization signals such as PBCH and SS are transmitted by the base station at time t ₀ , the terminals decode the received signals using subcarrier intervals corresponding to a preset (ie, known) default numerology. Can be performed.

In this case, each terminal may be configured to receive timing (i.e., timing) information (eg, numerology information, subcarrier interval, number of symbols, etc.) used for the service to be used by the terminal from the base station. have.

FIG. 6 shows an example in which information related to a service desired to be used by the terminal, that is, timing information in which a corresponding service is transmitted, is transmitted through an x-PBCH (that is, MIB of x-PBCH) transmitted in a section 602. However, this is for convenience of description, and the information may be transmitted through the SIB of the x-SSS or the x-PDSCH as well as the x-PBCH.

The operation of the base station (ie, the transmission operation) and the operation (ie, reception) of the base station for transmission of the information in each case (cases using x-SSS, MIB of x-PBCH or SIB of x-PDSCH) And operation after reception) may be the same as the operation of the base station / terminal (ie, the operation in 1) to 3) described above).

In addition, in FIG. 6, a case in which x-SS (for example, x-PSS and x-SSS) and x-PBCH is transmitted in the FDM scheme is considered. In contrast, x-SS and x-PBCH may be used in the TDM scheme. The case of transmission may also be considered.

7 shows another example of a structure in which different numerologies to which the present invention can be applied coexist in a TDM manner. 7 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 7, except that the PSS, SSS, and PBCH are transmitted in the TDM scheme in the interval 702 (that is, the interval from time t _{0 to} time t _i ) in which the default numerology is used, is described in FIG. 6. The same may apply.

In addition, as in (1), after the terminal receives the information on the timing (that is, numerology information used at that timing) from the base station is transmitted from the base station according to the above-described procedure, the terminal The subframe may be received at a timing set for the corresponding service. In this case, the terminal may be configured to re-tune time / frequency synchronization again at subcarrier intervals according to numerology used at the corresponding timing, and then receive a downlink control channel.

In this case, there is a need for a method in which a terminal can check whether a frequency / time synchronization value obtained in a period where a default numerology is used (that is, at time point t ₀ ) is maintained. That is, it is necessary to consider a method of confirming whether the frequency / time synchronization value obtained using the default numerology is applied to the subframe corresponding to the service that the terminal wants to use.

To this end, in each subframe using different numerology, a reference signal (eg, TRS) used to maintain frequency / time synchronization may be additionally transmitted. In this case, the reference signal may be transmitted at a longer period than the synchronization signal (ie, a signal transmitted using default numerology). The structure in which the reference signal is additionally transmitted may be the same as that of FIGS. 8A and 8B.

8A and 8B illustrate examples in which reference signals for maintaining synchronization are included in a structure in which different numerologies coexist in a TDM scheme to which the present invention can be applied. 8A and 8B are merely for convenience of description and do not limit the scope of the present invention.

Referring to FIG. 8A, compared to FIG. 6, various timings in which a reference signal for maintaining synchronization, that is, a TRS (or T-RS) 803, transmits a downlink control channel / signal for each subframe in which different numerologies are used. Among these, it is assumed that additional transmission is performed in an area (ie, a resource unit) corresponding to a specific timing determined according to a preset period and / or a preset location. In this case, the reference signal transmitted in each region may be transmitted based on the subcarrier spacing according to numerology used in the corresponding region.

For example, in FIG. 8A, the TRS for the first numerology is transmitted in the region 805 set based on the subcarrier spacing according to the first numerology, and the TRS for the second numerology is sent to the subcarrier spacing according to the second numerology. The TRS for the third numerology is transmitted in the region 807 set based on the third region. The TRS for the third numerology is transmitted in the region 809 set based on the subcarrier spacing according to the third numerology.

Referring to FIG. 8B, the operation of the base station / terminal in FIG. 8B is the same as that described in FIG. 8A except for the operation in the interval 802 where the default numerology is used.

Specifically, in the case of FIG. 8A, the SS and the PBCH are transmitted in the FDM scheme in the interval 801 in which the default numerology is used. In FIG. 8B, the PSS, the SSS, and the PBCH are transmitted in the TDM scheme in the interval 802 in which the default numerology is used. do. Here, SS (eg, PSS, SSS) and PBCH shown in FIGS. 8A and 8B mean x-SS (eg, x-SSS, x-PSS) and x-PBCH, respectively.

Through the above-described method (1) or (2), the terminal may acquire information on numerology corresponding to a service that the user wants to use by using a preset default numerology. Accordingly, the terminal can efficiently access the corresponding service without unnecessary search procedure for the corresponding service.

In this case, as the terminal performs synchronization with the base station using only the preset default numerology, there is no need to perform synchronization operations for other numerologies. Accordingly, overhead for synchronization between the base station and the terminal can be reduced.

The aforementioned methods of (1) and (2) may refer to a method related to an initial cell search operation for supporting stand-alone mode. In addition, the above-described requirements are different for each scenario, so that one or more default numerologies are supported in each frequency band in order to access the cell as quickly as possible. It can mean doing. For example, at 6 GHz or less, at least the PSS is configured to 30 kHz for differentiation from the legacy LTE system, and may be transmitted using another cyclic prefix (CP).

In this case, when the terminal needs to acquire the synchronization signal / channel and system information again after the initial cell search, the synchronization signal / channel may be different from the synchronization signal channel transmitted at the initial cell search. In this case, the transmission of the synchronization signal / channel and system information to be acquired after the initial cell search may be set to a numerology different from the numerology used during the initial cell search.

In this aspect, the subband through which synchronization signals / channels and system information are transmitted using the default numerology may be assumed to be an anchor subband, and the anchor subband by the default numerology may be a minimum / maximum system bandwidth. (minimum / maximum system bandwidth) can be configured based on X.

After the UE accesses the anchor subband, the UE may be switched (ie, moved) to a subband using different numerology by system information and RRC (configuration). At this time, the cell reselection and / or cell association management procedure may be set to be performed through the switched subband or always performed through the anchor subband.

If the procedure (s) is always performed on the anchor subband, the procedure (s) is a synchronization signal transmitted on the anchor subband (by default x-PSS, x-SS, but in some cases x-PBCH, x-PDSCH may be included). On the other hand, when the procedure (s) is performed through a switched subband, the procedure (s) may be performed when a synchronization signal (x-PSS, x-SSS, etc.) is being transmitted to the corresponding subband. .

Anchor subband, as described above, for the methods of delivering information related to a service that the terminal wants to use (ie, the operations of the base station / terminal discussed in (1), 2), and 3) The operations of the base station / terminal in are as follows.

When information related to a service that the terminal wants to use (or receive) is transmitted through the x-SSS, the base station may transmit the x-PSS and the x-SSS to the terminal using the default numerology through the anchor subband. In this case, the terminal may be configured to acquire (identify or determine) information related to a service that the user wants to use through the received x-SSS and switch to the corresponding subband. The terminal switched to the corresponding band may be configured to decode the x-PBCH and subsequent signals / channels according to the numerology used for the signal transmitted in the corresponding subband.

Alternatively, when information related to a service that the terminal wants to use is transmitted through the MIB of the x-PBCH, the base station uses the default numerology through the anchor subband to transmit the x-PSS, x-SSS, and x-PBCH to the terminal. Can transmit In this case, the UE may be configured to acquire information related to a service that it wants to use through the MIB of the received x-PBCH and switch to the corresponding subband. The terminal switched to the corresponding band may be configured to decode the x-PDSCH including the SIB and subsequent signals / channels according to the numerology used for the signal transmitted in the corresponding subband.

Or, if information related to a service that a UE wants to use is transmitted through SIB of x-PDSCH, the base station uses x-PSS, x-SSS, x-PBCH, and SIB by using default numerology through anchor subband. The x-PDSCH may be transmitted to the terminal. In this case, the UE may be configured to acquire information related to a service it wants to use through the SIB of the received x-PDSCH and switch to the corresponding subband. The terminal switched to the corresponding band may be configured to decode the x-PDSCH including data and the signals / channels transmitted thereafter according to the numerology used for the signal transmitted in the corresponding subband.

In addition, in the case of URLLC, the UE needs to quickly acquire information on whether the corresponding cell supports URLLC or the like. This information may be supported (or conveyed) from the synchronization signal stage. In other words, the base station may transmit information about a service supported by the corresponding cell to the terminal through x-PSS and / or x-SSS transmitted in the anchor subband. This method may be limited to URLLC or the like, where prevention of latency is important, and may be performed according to an on / off method or a 1-bit information transmission method.

In addition, in the case of URLLC, since information needs to be transmitted quickly using relatively low power, it is preferable that the measurement result be quickly supported. To this end, a synchronization signal may be used or a method in which a measurement reference signal is transmitted in a corresponding symbol may be considered.

9 is a flowchart illustrating an operation of a terminal for obtaining information on numerology in a wireless communication system supporting a plurality of numerologies to which the present invention can be applied. 9 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 9, it is assumed that a wireless communication system in which a terminal and a base station operate supports a plurality of numerologies, and the terminal uses a predetermined default numerology to synchronize time / frequency with the base station.

In step S905, the terminal receives a first synchronization signal (eg, x-PSS) and a second synchronization signal (x-SSS) using a default numerology among a plurality of numerologies from the base station.

Thereafter, in step S910, the terminal acquires synchronization (ie, time / frequency synchronization) with the base station based on the received first synchronization signal and the second synchronization signal. In other words, the terminal may perform synchronization with the base station based on the synchronization signal transmitted through the default numerology.

After the terminal acquires synchronization with the base station, in step S915, the terminal receives information on the remaining numerology except the default numerology from the base station through at least one of a specific signal or a specific channel using the default numerology. Herein, the remaining numerology means numerology except for the default numerology among a plurality of numerology.

In addition, the first sync signal, the second sync signal, and a specific channel (eg, x-PBCH, x-PDSCH, etc.) are each transmitted through different time resources (i.e., through the TDM scheme described above). Numerologies are set to different frequency resources in the frequency domain supported by the base station (that is, set in the TDM scheme described above).

In this case, the information on the remaining numerology may include a subcarrier interval, the number of symbols, and the like corresponding to the remaining numerology. In addition, the UE may obtain information about the remaining numerology according to an offset value between a position where a specific signal (eg, x-SSS) is transmitted and a position where a specific channel (eg, x-PBCH) is transmitted. Alternatively, the terminal may obtain information on the remaining numerology through information (eg, an index) indicating the remaining numerology included in at least one of a specific signal or a specific channel.

In addition, the terminal may receive a reference signal for determining whether the synchronization value for the default numerology and the synchronization value for the remaining numerology match. That is, the terminal may maintain synchronization with respect to numerology other than the default numerology using the reference signal (eg, TRS). In this case, as shown in FIG. 5B, the terminal may receive the reference signal through some resources of the downlink control channel region set according to numerology.

General apparatus to which the present invention can be applied

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

Referring to FIG. 10, a wireless communication system includes a base station 1010 and a plurality of terminals 1020 located in an area of a base station 1010.

The base station 1010 includes a processor 1011, a memory 1012, and an RF unit 1013. The processor 1011 implements the functions, processes, and / or methods proposed in FIGS. 1 to 9. Layers of the air interface protocol may be implemented by the processor 1011. The memory 1012 is connected to the processor 1011 and stores various information for driving the processor 1011. The RF unit 1013 is connected to the processor 1011 and transmits and / or receives a radio signal.

The terminal 1020 includes a processor 1021, a memory 1022, and an RF unit 1023.

The processor 1021 implements the functions, processes, and / or methods proposed in FIGS. 1 to 9. Layers of the air interface protocol may be implemented by the processor 1021. The memory 1022 is connected to the processor 1021 and stores various information for driving the processor 1021. The RF unit 1023 is connected to the processor 1021 and transmits and / or receives a radio signal.

The memories 1012 and 1022 may be inside or outside the processors 1011 and 1021, and may be connected to the processors 1011 and 1021 by various well-known means.

As an example, in order to transmit and receive downlink data (DL data) in a wireless communication system supporting a low latency service, the terminal is a radio frequency (RF) unit for transmitting and receiving a radio signal, and a functional unit with the RF unit. It may include a processor connected to.

In addition, the base station 1010 and / or the terminal 1020 may have a single antenna or multiple antennas.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, it is also possible to combine the some components and / or features to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that the embodiments can be combined to form a new claim by combining claims which are not expressly cited in the claims or by post-application correction.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. For implementation in hardware, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in memory and driven by the processor. The memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

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

In a wireless communication system supporting a plurality of numerologies of the present invention, a method for obtaining information on numerology by a terminal has been described with reference to examples applied to 3GPP LTE / LTE-A system and 5G system (New RAT system). It is possible to apply to various wireless communication systems.

Claims (11)

1. A method for a UE to obtain information on numerology in a wireless communication system supporting a plurality of numerologies,

   Receiving a first synchronization signal and a second synchronization signal using a default numerology among the plurality of numerologies from a base station;

   Acquiring synchronization with the base station based on the received first synchronization signal and second synchronization signal;

   Receiving information on the remaining numerology from the base station through at least one of a specific signal or a specific channel using the default numerology,

   The remaining numerology is a numerology excluding the default numerology among the plurality of numerology,

   The first sync signal, the second sync signal, and the specific channel are each transmitted through different time resources,

   The plurality of numerologies are set to different frequency resources in the frequency resource region supported by the base station.
2. The method of claim 1,

   The information on the remaining numerology includes at least one of a subcarrier spacing or the number of symbols corresponding to the remaining numerology.
3. The method of claim 2,

   The information about the remaining numerology is determined based on an offset between the location where the particular signal is transmitted and the location where the particular channel is transmitted.
4. The method of claim 2,

   And receiving, from the base station, a reference signal for determining whether the synchronization value for the default numerology and the synchronization value for the remaining numerology match.
5. The method of claim 4, wherein

   The reference signal is received through some resources of a downlink control channel region set according to the remaining numerology.
6. The method of claim 2,

   The second synchronization signal is a secondary synchronization signal (secondary synchronization signal),

   The specific channel is a physical channel including a master information block or a physical channel including a system information block.
7. The method of claim 2,

   The specific signal is the second synchronization signal,

   At least one of the specific signal or the specific channel includes information indicating the remaining numerology.
8. The method of claim 7, wherein

   When a plurality of indices corresponding to the plurality of numerologies are preset,

   The information indicating the remaining numerology includes an index corresponding to the remaining numerology among the plurality of indices.
9. The method of claim 7, wherein

   If the particular signal includes information indicating the remaining numerology, the particular channel is received according to the remaining numerology.
10. The method of claim 7, wherein

    If the particular signal does not include information indicating the remaining numerology, the particular channel is received according to the default numerology.
11. A terminal for obtaining information on numerology in a wireless communication system supporting a plurality of numerologies,

    A transceiver for transmitting and receiving a wireless signal,

    A processor that is functionally connected to the transceiver;

    The processor,

    Receive from the base station a first synchronization signal and a second synchronization signal using default numerology among the plurality of numerologies,

    Acquire synchronization with the base station based on the received first synchronization signal and second synchronization signal,

    Receiving information on the remaining numerology from the base station through at least one of a specific signal or a specific channel using the default numerology,

    The remaining numerology is a numerology excluding the default numerology among the plurality of numerology,

    The first sync signal, the second sync signal, and the specific channel are each transmitted through different time resources,

    And the plurality of numerologies are set to different frequency resources in the frequency resource region supported by the base station.

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