KR20180026604A - Apparatus and method of multiple numerology configuration for NR(New Radio) - Google Patents

Abstract

The present invention proposes one or more secondary numerology resource allocation methods based on reference numerology as a method for supporting a mixed numerology based frame structure. More specifically, the present invention proposes a method for supporting multiple numerology having different subcarrier spacing and corresponding length of subframe, slot, or min-slot through one NR frequency band.

Description

[0001] METHOD AND APPARATUS FOR SETTING MULTI-MULTIPLEOLOGY FOR NEXT GENERATION RADIO ACCESS NETWORKS [0002]

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.

One embodiment provides a method for setting up a multiple numerology for a next generation wireless access network, the method comprising: setting reference numerology and one or more secondary numerology in one NR frequency band; setting a number of secondary numerology, Setting secondary numerology configuration information that includes information, and signaling secondary numerology configuration information.

FIGS. 1 and 2 illustrate an example of reference numerology and secondary numerology region configurations.
3 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
4 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 (eg, X = 14 or 7, or any other natural number) composed of X OFDM symbols as a scheduling unit in the time domain, ie, a resource allocation unit in the time domain, Or Z OFDM symbol (s) with a granularity smaller than the corresponding subframe or slot (ie, Z <Y &lt; Y &gt;Lt; X &lt; X &lt; X).

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 one or more secondary numerology resource allocation methods based on reference numerology as a method for supporting a mixed numerology based frame structure.

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 supporting a plurality of numerologies having different subcarrier spacing and corresponding subframe (or slot, mini-slot) length through one NR frequency band.

If multiple numerologies are supported on any NR carrier, reference numerology can be defined that is based on the subframe duration defined on the time axis. In this case, the downlink synchronization signal (e.g., PSS / SSS) in the NR carrier and the PBCH for transmitting essential system information can be defined based on the corresponding reference numerology.

If a reference numerology is defined in an arbitrary NR carrier, a numerology having a sub-carrier spacing other than the reference numerology, ie, a slot length, and the like, other than the reference numerology supported by the corresponding NR carrier, In the present invention, it will be referred to as secondary numerology. However, the secondary numerology is only for the explanation of the present invention, and the present invention is not limited thereto.

As described above, we propose a method to support one or more secondary numerology through NR carrier of NR.

point 1. Secondary numerology configuration information

If at least one secondary numerology is supported in addition to the reference numerology in any NR carrier, the secondary configuration information may be set in the base station and transmitted to the UE. The corresponding secondary numerology configuration information may include information about the number of secondary numerologies excluding the reference numerology or reference numerology supported by the NR carrier. In addition, the corresponding secondary numerology configuration information may include information on each secondary numerology type (e.g., sub-carrier spacing, slot size, mini-slot size, etc.) supported by the corresponding NR carrier -size and mini-slot size information may refer to the number of OFDM symbols constituting the corresponding slot or mini-slot). In addition, the corresponding secondary numerology configuration information may include radio resource allocation information for each secondary numerology. The corresponding radio resource allocation information may include frequency domain resource allocation information and time-domain resource allocation information. In this case, the frequency domain resource allocation information may be RB allocation information based on an RB (Resource Block) configured through the system bandwidth of the NR carrier based on reference numerology. Specifically, as a method of constructing the corresponding frequency domain resource allocation information, the RB allocation information may be continuous RB allocation information based on localized based on the RB index of the starting point and the number of allocated RBs. Another method for constructing the corresponding frequency domain resource allocation information is a distributed based RB allocation information consisting of the offset value of the RB (or RB group) in the corresponding system band, the size of the RB group and the interleaving size (or hopping size) .

As another method of frequency-domain resource allocation for secondary numerology, frequency-domain resource allocation for secondary numerology can be implicitly defined through bandwidth allocation information for reference numerology. In one embodiment, the reference numerology is defined to be composed of M RBs of the system bandwidth based on the center frequency of the corresponding NR carrier, and the M value can be defined to be set by the BS. In this case, up to two secondary numerology can be additionally set in one NR carrier except for reference numerology, and each secondary band can be set up in the frequency band of (N / 2 - M / 2) RBs located at the upper edge of the system band a sub-band of numerology # 1 is configured, and a sub-band of secondary numerology # 2 is configured through a frequency band of (N / 2-M / 2) RBs located at the lower edge of the system band.

In another embodiment, the reference numerology can be defined to be composed of the upper P RBs and the lower Q RBs based on the center frequency of the NR carrier as shown in FIG. In this case, the P value and the Q value can be set by the base station, respectively, and up to two secondary numerology can be set in the NR carrier as in the above embodiment. As shown in FIG. 2, the two secondary numerology correspond to a sub-band of secondary numerology # 1 through the frequency band of (N / 2 - P) RBs located at the upper edge of the system band, The sub-band of secondary numerology # 2 can be configured through the frequency band of (N / 2-Q) RBs.

The time-domain resource allocation unit of the secondary resource allocation information may be subframe allocation information based on a subframe defined based on reference numerology. The subframe allocation information may be defined to form a bitmap information area according to the number of subframes within a period based on a predetermined period (e.g., a radio frame), and set subframe allocation information through the bitmap information area. However, in this case, only subframes other than the subframe (referred to as a reference subframe in the present invention) in which the PSS / SSS and the PBCH are transmitted can be allocated. Or time-domain resource allocation unit among the radio resource allocation information per secondary numerology may be slot allocation information based on a slot defined based on reference numerology. The slot allocation information can be defined to form a bitmap information area according to the number of slots in a corresponding period based on a predetermined period (e.g., a radio frame), thereby setting slot allocation information. However, in this case, only the slots other than the slot (referred to as a reference slot in the present invention) to which the PSS / SSS and the PBCH are transmitted can be allocated.

The corresponding radio resource allocation information for each secondary numerology may include only the frequency-domain resource allocation information described above. In this case, according to the secondary frequency-domain resource allocation information in all the subframes, the FDM scheme between reference numerology and secondary numerology is multiplexed . Alternatively, the radio resource allocation information for each secondary numerology may include only the time-domain resource allocation information. In this case, in the allocated subframe, the reference numerology of the entire band of the corresponding NR carrier is configured based on the corresponding secondary numerology, TDM-based multiplexing between numerology can be set.

In addition, the corresponding frequency-domain resource allocation information and the time-domain resource allocation information constituting the radio resource allocation information for the corresponding secondary numerology may be set independently of each information region through separate coding, Domain resource allocation information and time-domain allocation information based on one piece of configuration information.

point 2. Secondary numerology setting signaling  Way

The secondary numerology configuration information is semi-static, and the corresponding configuration information is transmitted through the MIB (Master Information Block) or the SIB (System Information Block) Cell-specific RRC signaling. As another signalling method of the secondary numerology configuration information configured by the above point 1, the corresponding secondary numerology configuration information is dynamically set and can be transmitted through the L1 / L2 control channel. In this case, the L1 / L2 control channel including the corresponding secondary numerology configuration information is dynamically set for each subframe through all subframes except for the above subframes or the reference subframe, or transmitted in a slot unit Can be dynamically configured and transmitted over all slots except for all slots or reference slots. Alternatively, the L1 / L2 control channel including the corresponding secondary numerology configuration information can be defined to be transmitted through a reference subframe or a reference slot. In this case, the secondary numerology configuration can be set based on the reference subframe or reference slot cycle . Alternatively, the L1 / L2 control channel including the corresponding secondary numerology configuration information is transmitted through the first subframe or the first slot constituting the radio frame. In this case, the base station sets and transmits the secondary numerology configuration information of the corresponding radio frame can do. Alternatively, the L1 / L2 control channel containing the secondary numerology configuration information may be transmitted through any subframe (eg, the first subframe or the last subframe) or any slot (eg, the first slot or the last slot) In this case, the secondary numerology configuration information of the next radio frame can be set and transmitted through the L1 / L2 control channel for the corresponding numerology setting.

In addition, the signalling of the secondary numerology configuration information described above can be defined to be performed through the reference numerology region. In particular, in the case of the dynamic setting method through the L1 / L2 control channel, the NRC PDCCH region of the reference numerology have.

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

3, 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 support a plurality of numerologies having different subcarrier spacing and subframes according to the present invention through one NR frequency band.

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.

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

4, a user terminal 1100 according to another embodiment 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 controls the overall operation of the terminal according to the above-described present invention by supporting a plurality of numerologies having different subcarrier spacing and corresponding subframes through one NR frequency band.

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 multiple numerology setting method for a next generation radio access network,
Setting reference numerology and one or more secondary numerology in one NR frequency band;
Setting secondary numerology configuration information including the number of the secondary numerology, the type of the secondary numerology, and the radio resource allocation information; And
And signing the secondary numerology configuration information.

Images