KR20180026027A - Apparatus and method of wireless resource configuration for NR(New Radio) - Google Patents

Abstract

The present invention proposes a method for efficiently supporting a plurality of numerologies with different subcarrier spacing and a subframe (or slot, mini-slot) length according to the same through one NR frequency band. In particular, if a mixed numerology is supported through one NR carrier, the present invention proposes a method for supporting a dynamic TDM between a reference numerology and a usage scenario specific numerology. A method for setting a wireless resource for a next generation wireless access network includes the steps of: setting numerology type N1 with the reference numerology; setting numerology type N2 with the usage scenario specific numerology; and transmitting information indicating the set or changed numerology. Accordingly, the present invention can satisfy URLLC requirement in a time domain resource allocation structure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a radio resource setting method and apparatus for a next generation radio access network,

The present invention proposes an efficient mixed numerology support method in a next generation / 5G radio access network (hereinafter referred to as "NR [New Radio]" in the present invention) that has been discussed in 3GPP.

In one embodiment, a method for setting up a radio resource for a next-generation radio access network includes setting a numerology type N1 as a reference numerology in one NR frequency band, and setting a numerology type N1 as a usage scenario- N2, and transmitting information indicating the set or changed numerology.

FIG. 1 shows an example of a dynamic numerical change indication (in case of subcarrier spacing for reference numerology = f0 and subcarrier spacing for secondary numerology = 2 x f0).
2 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
3 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-advanced, a standard is constructed by configuring uplink and downlink based on a single carrier or carrier pair. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the PDCCH, and the PDCCH may be applied to the portion described with the EPDCCH.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of PDSCH, and uplink data channel A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

NR (New Radio)

3GPP recently approved the study item "Study on New Radio Access Technology" for research on next generation / 5G radio access technology, and based on this, RAN WG1 has frame structure, channel coding and modulation , waveform & multiple access scheme and so on. NR is required not only to improve the data transmission rate as compared with LTE, but also to design various requirements that are required according to granular and specific usage scenarios. In particular, enhancement mobile broadband (eMBB), massive MTC (MMTC) and URLLC (Ultra Reliable and Low Latency Communications) have been proposed as typical usage scenarios of NR. As a method to satisfy the requirements of each usage scenario, structure design is required. Specifically, eMBB, mMTC, and URLLC are considered as typical usage scenarios of NR that are being discussed in 3GPP. Since each usage scenario has different requirements for data rates, latency, coverage, etc., it is necessary to use different numerology (eg subcarrier) to efficiently satisfy the requirements of each usage scenario through frequency bands constituting an NR system there is a need for a method of effectively multiplexing a radio resource unit based on a space, a subframe, a TTI, etc. For example, in the same way as the existing LTE, a structure of 1 ms subframe (or 0.5 ms slot) based on 15 kHz subcarrier spacing, a structure of 0.5 ms subframe (or 0.25 ms slot) based on 30 kHz subcarrier spacing, and a structure of 0.25 ms subframe (0.125ms slot) structure in a single NR frequency band.

In addition, a subframe consisting of X OFDM symbols (eg, X = 14 or 7, or any other natural number) can be used as a scheduling unit in the time domain, ) Or a slot (Y = 14 or 7 or any other natural number) consisting of Y OFDM symbols or Z OFDM symbols with a granularity smaller than the corresponding subframe or slot (ie Z <Y &Lt; < X &gt;). &Lt; / RTI &gt;

As described above, a method for supporting a scheduling unit having different lengths in the time domain has been discussed as a method for satisfying various usage scenarios in NR. As a method for this, a numerical method based on large subcarrier spacing (eg 60kHz, 120kHz, 240kHz) and a relatively long time domain scheduling unit Supports small subcarrier spacing (eg 15kHz for eMBB, 3.75kHz for mMTC) for usage scenarios such as eMBB (or mMTC), which can be efficient resource allocation, in FDM, TDM or FDM / TDM format via one NR carrier A mixed numerology based frame structure has been proposed.

The present invention proposes a scheme to efficiently support mixed numerology to satisfy the URLLC requirement even within a long time-slot resource allocation structure such as eMBB and mMTC.

As described above, in order to support the URLLC service in NR, it is necessary to support a short time interval scheduling unit (or TTI, Transmission Time Interval) that can satisfy the latency boundary in the time domain. On the other hand, in the case of eMBB or mMTC, it is effective to apply the time-domain resource allocation unit, which is slightly longer than the URLLC usage scenario, in terms of control overhead and coverage in defining the scheduling unit in the time domain. In order to satisfy these various NR usage scenarios, numerology of subcarrier spacing (eg, larger subcarrier spacing such as 60kHz, 120kHa, etc.) and subcarrier spacing suitable for eMBB and mMTC (for example, 15kHz for eMBB or 3.75kHz for mMTC) with a single NR carrier.

For example, when an arbitrary NR carrier is configured through the below 6 GHz band, a 1 ms subframe (or a 0.5 ms slot composed of 7 OFDM symbols) composed of 14 OFDM symbols based on 15 kHz subcarrier spacing suitable for eMBB It is necessary to support a 0.25 ms subframe (or 0.125 ms slot I) structure based on 60 kHz suitable for URLLC through one NR frequency band (although the absolute time duration of the subframe or slot and the OFDM symbols The subframe length and slot length for each subcarrier spacing and the number of OFDM symbols corresponding thereto may be different).

The present invention proposes a method for efficiently supporting a plurality of numerologies having different subcarrier spacing and thus subframe (or slot, mini-slot) length through one NR frequency band.

Especially, when supporting mixed numerology through a single NR carrier, we propose a dynamic TDM support method between reference numerology and usage scenario specific numerology.

For the description of the present invention, numerology types consisting of a set of subcarrier spacing and subframe (or slot, mini-slot) lengths are denoted N1, N2, N3, ..., respectively. . For example, N1 is a numerology type with a 15kHz subcarrier spacing based subframe (or slot, mini-slot) structure and N2 has a 30kHz subcarrier spacing based subframe (or slot, mini-slot) Another numerology type, N3, can be defined as a third numerology type with subframe (or slot, mini-slot) structure based on 60kHz. However, the concept of the present invention can be applied regardless of the number of numerology types defined for NR and the specific values of subcarrier spacing and subframe (or slot, mini-slot) lengths constituting each numerology type.

In any NR carrier, a reference (eg eMBB) or a frequency range (eg below and sub-6 GHz or over 6 GHz (mmWave band)) consisting of a specific usage scenario Numerology can be set up and additional subcarrier spacing based numerology can be defined to support a particular usage scenario. For example, in case of any NR carrier configured in the blew and sub-6GHz band, the numerology based on 15kHZ subcarrier spacing is set as the reference numerology, and mixed numerology based frame structure with additional support of 60kHZ subcarrier spacing based numeric based on URLLC .

That is, numerology type N1 is set as an arbitrary reference numerology in any NR carrier, and one or more numerology type (s) (eg, N2, N3, ...) can be additionally supported as a usage scenario specific numerology. As a way of supporting a plurality of numerologies in one NR carrier, a time / frequency region in which uplink / downlink transmission / reception is performed based on each numerology type can be set semi-static. However, semi-static assignment of a specific usage scenario specific numerology can be inefficient in terms of resource utilization.

As a method for solving this problem, in the present invention, dynamic numerology (or subcarrier spacing) is used as a method for multiplexing a usage scenario specific numerology dynamically in a frame structure based on a reference numerology based subframe (or slot, mini-slot) Indication channel is defined, and a method of allocating the numerology region specific to the usage scenario is proposed dynamically.

Definition of dynamic numerology ( subcarrier  spacing

Reference numerology, a scheduling unit in a time-domain for any NR terminal (eg, eMBB terminal) operating on N1, one subframe consisting of X OFDM symbols or one slot consisting of Y OFDM symbols Or a Z-OFDM symbol is configured, transmission and reception of a downlink control channel including scheduling information for the NR terminal can be performed in units of scheduling units in the corresponding time domain. That is, when the length of the scheduling unit of the time-domain for the downlink (or uplink) data channel of any NR terminal configured to operate on the basis of N1 is P, the corresponding terminal transmits And a downlink control channel for transmitting the corresponding scheduling control information may be defined based on the scheduling control information. In this case, when the number of OFDM symbols constituting the corresponding time-domain scheduling interval P is Q, the corresponding Q value has values of X, Y, and Z according to the time-domain scheduling unit configuration, or multiplex of X, Y, and Z, respectively.

On the other hand, in the NR carrier, a secondary scheduling unit (s) having different scheduling time intervals based on secondary numerology (s) suitable for a specific usage scenario (eg URLLC or mMTC) ) Can be defined.

If a plurality of numerologies and a corresponding plurality of scheduling units are defined in an arbitrary NR carrier, a dynamic numerology indication channel for dynamically informing numerology and corresponding scheduling unit setting during a certain time interval can be defined .

As a first method of dynamic numerology configuration through a corresponding dynamic numerology indication channel, a corresponding dynamic numerology indication channel is transmitted through a first OFDM symbol (or first consecutive n OFDM symbols) of a subframe defined based on reference numerology, And to transmit the numerology setting information and the scheduling unit setting information corresponding thereto in the corresponding subframe. Alternatively, the dynamic numerology indication channel is transmitted through the first OFDM symbol (or the first consecutive n OFDM symbols) of the time-domain scheduling interval P defined on the basis of the reference numerology, and the corresponding time-domain scheduling interval, P And the scheduling unit setting information according to the numerology setting information.

Another method of dynamic numerology configuration through the dynamic numerology indication channel is as follows. The dynamic numerology indication channel includes a first OFDM symbol (or first consecutive n OFDM symbols) or a last OFDM symbol (Or the last consecutive n OFDM symbols), and the numerology configuration information of the next subframe of the subframe in which the corresponding dynamic numerology indication channel is transmitted and the corresponding scheduling unit setting information may be transmitted. Alternatively, the dynamic numerology indication channel may include the time-domain scheduling interval defined on the reference numerology, the first OFDM symbol of P (or the first consecutive n OFDM symbols) or the last OFDM symbol (or the last consecutive n OFDM symbols ), The time-domain scheduling interval in which the corresponding dynamic numerology indication channel is transmitted, the numerology setting information of the next time-domain scheduling interval of P, and the scheduling unit setting information corresponding to the time-domain scheduling interval.

In addition, the corresponding subframe set through the dynamic numerology indication channel, or the numerology setting information in the time-domain scheduling interval, P, may be one or more numerology setting information. In other words, it can be set by multiplexing in a TDM or FDM format between a plurality of numerologies within a corresponding subframe, or a time-domain scheduling interval, P, and the corresponding setting information can be transmitted through a dynamic numerology indication channel. In this case, when multiplexing is performed by the TDM between the plurality of numerologies, the time-domain allocation information for each numerology can be transmitted together through the corresponding dynamic numerology indication channel. When multiplexing is performed by the FDM between the plurality of numerologies, Can be transmitted through the corresponding dynamic numerology indication channel.

In addition, the numerology set up through the corresponding dynamic numerology indication channel may be set in addition to the subframe unit or the time-domain scheduling interval, P, in addition to the radio frame unit, or in any other case, And can be included in the scope of the invention.

Definition of dynamic numerology ( subcarrier  spacing change indication channel

As another form of the method of setting a specific dynamic numerology, a default value based on a scheduling unit structure based on a reference numerology and a time-domain scheduling interval P (i.e., OFDM symbol Q) frame structure is defined and a dynamic numerology change indication channel based on the default frame structure is defined and the base station can instantaneously change the numerology according to the presence or absence of traffic for any usage scenario.

That is, as shown in FIG. 1, when a URLLC traffic is generated in an NR cell having a default frame structure based on an RB structure and a time domain scheduling interval, P (or Q OFDM symbol) based on reference numerology, By indicating the numerology change via the indication channel, it is possible to change the numerology during any time duration, i.e., k OFDM symbol duration based on the reference numerology.

In this case, the number k of the OFDM symbols defining the time slot in which the instantaneous numerology change is made is signaled through the corresponding dynamic numerology change indication channel or set semi-static through cell-specific / UE specific RRC singing , Or a reference numerology and corresponding subcarrier spacing values, corresponding numerology and corresponding subcarrier spacing values, and the like.

(Eg, N2, N3, N4, ...), the numerology type (N2 vs. N3 vs N3) that is instantaneously changed through the corresponding dynamic numerical change indication channel . N4, ...) can be set to signaling.

Also, as described above, a timing gap for numerology reset can be defined between the start point of a dynamic numerology change indication channel and an instantaneous numerology change made by the corresponding k OFDM symbols time periods. In this case, the timing gap (Eg, 1 OFDM symbol duration based on reference numerology or 1 modified OFDM symbol duration based on numerology) considering the processing time of the UE and the base station, or transmitted through the corresponding dynamic numerology change indication channel , cell-specific / UE-specific RRC signaling.

As shown in FIG. 1, when the instantaneous numerology change is set by the base station through the dynamic numerology change indication channel in a scheduling time interval (P) based on an arbitrary reference numerology, the downlink data (Or transmission of data) during the k OFDM symbol durations corresponding to the corresponding numerology change periods, or performs rate matching on the received (or data) can do. (Or transmission) based on the changed numerology through REs corresponding to new RBs (or subcarriers) and OFDM symbols (s) configured on the basis of numerology changed through the frequency band allocated for the UE Can be defined. Alternatively, an operation scheme to be performed by the UE among the above three operation schemes can be set in the base station, transmitted through a dynamic numerology change indication channel, or transmitted via UE-specific / cell-specific RRC signaling.

In addition, according to the embodiments described above, pure TDM multiplexing between numerology changed by reference numerology and corresponding dynamic numerology indication channel or dynamic numerology change indication channel is described based on reference numerology in the corresponding numerology change setting period. In this case, the frequency domain allocation information set by the secondary numerology can be set by signaling through the dynamic numerology indication channel or the dynamic numerology change indication channel.

2 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

2, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The controller 1010 controls the overall base station operation required to dynamically set the numerology in one NR frequency band and to indicate the set or changed numerlogy according to the present invention described above.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

3 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

3, a user terminal 1100 according to another embodiment of the present invention includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

The receiving unit 1110 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 1120 identifies a channel indicating numerology that is set or changed dynamically within one NR frequency band according to the present invention, and controls the overall operation of the terminal to recognize the numerology.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through the corresponding channel.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and some of the standard documents is added to or contained in the scope of the present invention, as falling within the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (1)

A radio resource setting method for a next generation radio access network,
Setting a numerology type N1 as reference numerology in one NR frequency band;
Setting a numerology type N2 in a usage scenario specific numerology in the NR frequency band; And
And sending information indicating a set or changed numerology.

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