KR20180107690A - Apparatus and method of DL control information transmission and reception for efficient DL resource allocation - Google Patents

Abstract

The present invention proposes a method for transmitting and receiving downlink control information for a next generation/5G radio access network. Particularly, proposed are a configuration of down link control information for supporting efficient multiplexing between data traffic with different QoS requirements such as enhanced mobile broad-band (eMBB), massive machine type communication (mMTC), and ultra reliable low-latency communication (URLLC), and a transmitting and receiving method thereof. The method for transmitting and receiving downlink control information according to the present invention includes the steps of: allocating a downlink radio resource; puncturing a part of the downlink radio resource; and performing urgent URLLC data transmission and reception.

Description

[0001] The present invention relates to a method and an apparatus for transmitting and receiving downlink control information for efficiently allocating downlink resources,

The present embodiments propose a method for transmitting / receiving downlink control information for a next generation / 5G radio access network (hereinafter referred to as "NR [New Radio]").

In an exemplary embodiment of the present invention, there is provided a method for transmitting / receiving downlink control information for an efficient downlink resource allocation, the method comprising: allocating downlink radio resources for data transmission of eMBB or mMTC; Puncturing some of the radio resources, and performing emergency URLLC data transmission / reception using punctured radio resources.

FIG. 1 shows an example of symbol level alignment among different SCS.
FIG. 2 shows an example of dynamic resource sharing between eMBB and URLLC data for DL (single puncturing case).
FIG. 3 illustrates an example of dynamic resource sharing between eMBB and URLLC data for DL (multiple puncturing case).
4 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
5 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 numerals even though 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.

As used herein, a wireless communication system refers to a system for providing 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).

The user terminal is a comprehensive concept that means a terminal in a wireless communication, and it is a comprehensive concept which means a mobile station (MS) in GSM, a mobile station (MS) in UT (User Terminal), a Subscriber Station (SS), 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, a gNode-B, a Low Power Node A sector, a site, various types of antennas, a base transceiver system (BTS), an access point, a point (for example, a transmission point, a reception point, a transmission / reception point) (RRH), a radio unit (RU), and a small cell, as well as a relay cell, a relay node, a megacell, a macrocell, a microcell, a picocell, a femtocell, an RRH,

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. Macro cell, micro cell, picocell, femtocell, small cell, or 2) the wireless region itself in connection with the wireless region. 1), all of the devices that interact to configure the wireless area to be cooperatively controlled by the same entity are all pointed to the base station. A point, a transmission / reception point, a transmission point, a reception point, and the like are examples of the base station according to the configuration method of the radio area. 2 may direct the base station to the wireless region itself to receive or transmit signals at the point of view of the user terminal or in the vicinity of the neighboring base station.

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 a transmission point or a transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

Herein, 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 Do not.

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) .

The time division duplex (TDD) scheme, which is transmitted using different time periods, can be used for the uplink and downlink transmission, and a frequency division duplex (FDD) scheme in which different frequencies are used, a TDD scheme and an FDD scheme A hybrid method can be used.

In the wireless communication system, the uplink and the downlink are configured with reference to one carrier or carrier pair to form a standard.

The uplink and the downlink transmit control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), and the like. The physical downlink shared channel (PDSCH), the physical uplink shared channel (PUSCH) It is composed of the same data channel and transmits data.

A downlink may refer to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink may refer to a communication or communication path from a terminal to a multiple transmission / reception point. At this time, in the downlink, the transmitter may be a part of the multiple transmission / reception points, and the receiver may be a part of the terminal. Also, 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, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

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

The base station performs downlink transmission to the UEs. The base station includes downlink control information, such as scheduling, required for reception of a downlink data channel, which is a primary physical channel for unicast transmission, and physical downlink control information for transmitting scheduling grant information for transmission in an uplink data channel. A control channel can be transmitted. Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

There are no restrictions on multiple access schemes applied in wireless communication systems. (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA) Various multiple access schemes such as OFDM-CDMA can be used. Here, the NOMA includes Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

One embodiment of the present invention relates to asynchronous wireless communications that evolve into LTE / LTE-Advanced, IMT-2020 over GSM, WCDMA, HSPA, and synchronous wireless communications such as CDMA, CDMA- Can be applied.

In this specification, a MTC (Machine Type Communication) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting 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. Or a further Enhanced MTC terminal defined in Release-14.

In this specification, NarrowBand Internet of Things (NB-IoT) terminal means a terminal supporting wireless access for cellular IoT. The objectives of NB-IoT technology include improved indoor coverage, support for large-scale low-rate terminals, low latency sensitivity, ultra-low cost, low power consumption, and optimized network architecture.

Enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) have been proposed as typical usage scenarios in NR (New Radio), which is under discussion in 3GPP.

In this specification, a frequency, a frame, a subframe, a resource, a resource block, a region, a band, a subband, a control channel, a data channel, a synchronization signal, various reference signals, various signals, May be interpreted as past or presently used meanings or various meanings used in the future.

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 data transmission rate as compared with LTE, but also to design various QoS 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) are defined as typical usage scenarios of NR. structure design is required. Since each usage scenario has different requirements for data rates, latency, reliability, coverage, etc., it is a method to efficiently satisfy the requirements of each usage scenario through frequency bands constituting an NR system. there is a need for an efficient multiplexing of radio resource units based on subcarrier spacing, subframe, TTI, etc., for example.

One method is to support TDM, FDM or TDM / FDM based multiplexing on one or more NR component carriers (s) for numerology with different subcarrier spacing values, and a scheduling unit in the time domain A discussion was made on how to support more than one time unit in composition. In this regard, NR is a type of time domain structure defined as a subframe. Reference numerology for defining the subframe duration is defined as 14 OFDM symbols of 15 kHz sub-carrier spacing (SCS) based normal CP overhead equivalent to LTE To define a single subframe duration. Thus, subframes in NR have a time duration of 1ms. However, unlike LTE, NR subframes are absolute reference time durations, and slots and mini-slots can be defined as time units that are the basis of actual uplink and downlink data scheduling. In this case, the number of OFDM symbols constituting the slot, y value is defined as y = 7 and 14 for the numerology having the SCS value of up to 60 kHz, and for the numerology having the SCS value larger than 60 kHz, y = Lt; / RTI >

Accordingly, any slot can be composed of 7 or 14 symbols, and all symbols are used for DL transmission according to the transmission direction of the corresponding slot, or all symbols are used for UL transmission, or the DL portion + (gap) + UL portion.

Also, a mini-slot composed of a smaller number of symbols than a corresponding slot is defined in an arbitrary numerology (or SCS), and a short-time time-domain scheduling interval is set for uplink / downlink data transmission or reception, A long-time time-domain scheduling interval for uplink / downlink data transmission and reception can be configured. In particular, in the case of transmission and reception of latency critical data such as URLLC, scheduling is performed in units of 0.5 ms (7 symbols) or 1 ms (14 symbols) based on a numerology-based frame structure having a small SCS value, such as 15 kHz , it is difficult to satisfy the latency requirement. Therefore, it is possible to define a mini-slot composed of a smaller number of OFDM symbols than the corresponding slot and to schedule the latency critical data such as the URLLC based on the defined mini-slot.

Alternatively, as described above, by supporting the numerology having different SCS values in one NR Carrier by multiplexing the TDM and / or FDM scheme, it is possible to reduce the number of slots based on the slot (or mini-slot) length defined for each numerology Scheduling of data according to latency requirement is also considered. For example, as shown in FIG. 1, when the SCS is 60 kHz, the symbol length is reduced to about 1/4 of that of the SCS 15 kHz. Therefore, when one slot is composed of 7 OFDM symbols, While the slot length based on 60 kHz is reduced to about 0.125 ms.

In this way, the NR is discussing how to satisfy the requirements of URLLC and eMBB by defining different SCSs or different TTI lengths.

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. In particular, to satisfy the URLLC requirement, it is necessary to subdivide the scheduling unit in the time-domain. However, from the viewpoint of eMBB, the granular time-domain scheduling unit is not desirable from the viewpoint of cell throughput because it involves excessive control overhead. Also, in terms of MMTC, a slightly longer time interval resource allocation scheme may be more appropriate for coverage enhancement.

In the present invention, in order to support efficient multiplexing between data traffic for each service in a network in which long time-domain resource allocation such as eMBB and mMTC are required to efficiently service and services requiring short time-domain resource allocation such as URLLC, Control information configuration and transmission / reception method.

As described above, in order to support the URLLC service in NR, it is necessary to support a short 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 various NR usage scenarios simultaneously, numerology of subcarrier spacing (eg, larger subcarrier spacing such as 60kHz, 120kHz, etc.) that is easy to define a short time interval resource allocation unit suitable for URLLC and subcarrier spacing suitable for eMBB and mMTC (for example, 15kHz for eMBB or 3.75kHz for mMTC) in a mixed numerology structure supporting one numerical value via an NR carrier, or a subframe or slot or mini-slot in an NR carrier operating in any one numerology It is necessary to simultaneously support time-domain scheduling units having different lengths. As a method, semi-static time / frequency resource (or region) in which resource allocation is performed based on the optimal scheduling unit for each usage scenario is semi-static, and according to the usage scenario of each terminal, You can define resource allocation using time / frequency resources.

However, semi-static resource allocation is not efficient in terms of radio resource utilization in an environment where traffic generation is randomly performed for each usage scenario.

As a method for solving this problem, a method of puncturing some radio resources among downlink radio resources allocated for data transmission of an eMBB or mMTC in a downlink data transmission resource allocation and performing dynamic puncturing based on puncturing Support for eMBB / URLLC multiplexing of superposition based on superposition of URLLC data transmission signal for some radio resources is required. In other words, it supports dynamic resource sharing between eMBB and URLLC, which is used for urgent URLLC data transmission by puncturing (or superpositioning) some eMBB (or mMTC) downlink resources that have already been allocated resources and on-going transmission .

In addition, when a dynamic resource sharing scheme based on dynamic puncturing (or superposition) between eMBB and URLLC is applied to the NR downlink, a method of explicitly indicating punctured radio resources to the corresponding eMBB UE for URLLC data transmission is considered . In this case, the indication method based on the explicit signaling is a method of indicating the corresponding puncturing information in a TTI (or a slot, a mini-slot, or a merged slot) in which the corresponding eBB DL data transmission is performed, A method of indicating whether puncturing is performed is considered.

According to the present invention, when dynamic resource sharing between eMBBs and URLLCs is applied, a method of configuring puncturing indication control information and a transmitting / receiving method for an eMBB terminal are proposed.

However, in the present invention, eMBB or URLLC is described based on usage scenarios. However, from the viewpoint of radio resource allocation and downlink data transmission / reception, an eMBB is defined as a long time-slot resource allocation unit of slot or merged slot unit And can be associated with a terminal or a data session in which a short time-domain resource allocation unit such as a mini-slot or a symbol or a large SCS-based slot unit is defined in case of URLLC.

Specifically, puncturing (or superposition) of a mini-slot or a symbol is performed in a downlink data transmission resource allocated in an arbitrary slot unit or a multiple slot unit, or some frequency resources (some PRBs The present invention can be applied to all PDSCH transmission and reception in which partial radio resource puncturing is performed for an on-going DL transmission in which puncturing (or superposition) is performed only for the PDSCH.

Accordingly, in the present invention, as shown in FIG. 2, the first terminal (eg, eMBB terminal) or the data corresponds to the downlink data transmission based on the scheduling unit based on the slot unit or the long time interval unit in which puncturing can be performed among the given downlink data transmission resources And a second terminal (e.g., a URLLC terminal) or data corresponds to downlink data transmission using puncturing a part of the downlink resources allocated for the eMBB terminal or data transmission.

2, when a part of PDSCH transmission resources of a first UE is punctured for PDSCH transmission of a second UE, a control information configuration method for puncturing indication to a first UE and a radio resource allocation method .

However, the present invention is not limited by the name. That is, a method of multiplexing between data transmissions with different latency requirements, or between different data transmissions in which scheduling based on different TTIs (Transmission Time Intervals) is performed, Based PDSCH multiplexing method that punctures the first PDSCH transmission resource (e.g., a part of the first PDSCH transmission resources) and uses the PDSCH transmission for latency critical other PDSCH transmissions (e.g., the second PDSCH transmission for the second UE) The downlink control information of the BS for indicating the punctured transmission resource information for the second PDSCH transmission to the first UE is described as puncturing indication downlink control information (DCI) And the scope of the present invention is not limited thereby. The.

Definition of DCI  format for puncturing indication / pre- emption  indication

A DCI format (eg, DL assignment DCI format and UL grant DCI format) and a puncturing indication / preemption indication DCI format for transmission of scheduling control information for allocation of PDSCH / PUSCH transmission / reception resources for puncturing indication / preemption indication The present invention is not limited thereto).

The puncturing indication / preemption indication DCI format is punctured (or superpositioned) for transmission of the second PDSCH for the second UE among the first PDSCH transmission resources allocated to the first UE, As a DCI format for indicating a radio resource to a first UE, a concrete embodiment proposed by the present invention for configuring a corresponding DCI format is as follows.

First Embodiment

The puncturing indication / preemption indication is defined to be UE-specific signaling. When a dynamic resource sharing between a first terminal and a second terminal is applied, a maximum of one mini-PDSCH transmission is performed for a single PDSCH transmission, It can be defined to allow only puncturing of -slot level (or consecutive symbol level). That is, as shown in FIG. 2, only puncturing by the transmission of a maximum of one second PDSCH in the first PDSCH region is allowed. In this case, the puncturing indication / preemption indication DCI format can be defined to include information such as a mini-slot index, a symbol index, or a starting symbol index + symbol duration for a punctured time-domain resource indication. In this case, the mini-slot length (ie, the number of symbols constituting the mini-slot) and the mini-slot boundary and the number of the DL (centric) slot, which are units for puncturing, specific higher layer signaling or may be dynamically set through the corresponding puncturing indication / preemption indication signal or may be implicitly determined by the transmission SCS (Subcarrier spacing) value set in the corresponding UE / cell / slot.

The puncturing indication / preemption indication may include punctured PRB (s) indication information in the punctured mini-slot. The punctured PRB (s) indication may be signaled as a bitmap indication scheme in units of PRB groups consisting of the allocated PRBs or a plurality of localized or distributed PRBs, or may be signaled by the second PDSCH scheduling control information (i.e., the second PDSCH for the second UE) The DL allocation DCI format for the PRB allocation information).

The puncturing indication / preemption indication may be defined to include transmission / pre-emption / puncturing type (however, the present invention is not limited by name for transmission / pre-emption / puncturing type). The transmission / pre-emption / puncturing type may be defined as an information area indicating whether the transmission of the second PDSCH in the corresponding radio resource is puncturing based on the first PDSCH, or whether it is superposed and transmitted.

In addition, the corresponding puncturing indication / preemption indication includes retransmission of the first PDSCH corresponding to the punctured or superposed radio resource region or the entire first PDSCH and PUCCH reconfiguration information for HARQ ACK / NACK feedback of the first UE can do.

Second Embodiment

A puncturing indication / preemption indication is defined to be UE-specific signaling, and a PDSCH transmission for a plurality of UEs or a plurality of PDSCH transmissions for a plurality of UEs in a first PDSCH transmission for an arbitrary first UE, Lt; RTI ID = 0.0 > PDSCH < / RTI > That is, as shown in FIG. 3, it is possible to allow puncturing for a plurality of PDSCH transmissions in the first PDSCH region by the BS / network / cell, such as the second PDSCH, the third PDSCH, the fourth PDSCH, Can be defined.

In this case, the puncturing indication / preemption indication may be defined to be individually signaled through a separate puncturing indication / preemption indication DCI message for each of the second PDSCH, the third PDSCH, the fourth PDSCH, .... Specifically, one puncturing indication / pre-selection indication DCI format is defined as a format for indicating puncturing or preemption information by a single priority PDSCH transmission as in the first embodiment, and when puncturing is performed by a plurality of PDSCHs, A puncturing indication / preemption indication DCI can be defined for each corresponding number and transmitted to the corresponding first terminal.

If multiple puncturing is supported, another puncturing indication / preemption indication may be defined to indicate puncturing by multiple PDSCHs through one puncturing indication / preemption indication DCI format. In this case, the puncturing indication / pre-selection indication DCI format may include an information area indicating the number of punctured mini-slots in the corresponding PDSCH TTI or the number of punctured PDSCHs transmitted. 3, puncturing is performed on three mini-slots or three PDSCH transmissions in the first PDSCH transmission TTI. Therefore, an information region for indicating the puncturing indication / preemption indication DCI format Can be defined. (Or a symbol group or a symbol group) constituting the PDSCH transmission TTI, and determines whether puncturing is generated in each mini-slot (or symbol or symbol group) in a bitmap manner You can define it to do. Or a puncturing indication / preemption indication. The puncturing indication / preemption indication indicates the aggregation level of the DCI format, ie the amount of radio resources used for transmitting the puncturing indication / preemption indication DCI format, the number of CCEs (Control Channel Element) The number of puncturing mini-slots or the number of punctured PDSCHs transmitted as a function of the SS (Search Space) transmitted.

In addition, PRB allocation information, transmission / pre-emption / puncturing type, retransmission status, and PUCCH reconfiguration information for HARQ ACK / NACK feedback of the first UE in the corresponding mini-slot are the same as those of the first embodiment Lt; / RTI >

In the first and second embodiments, the UE RNTI for monitoring the puncturing indication / preemption indication DCI is equal to the UE-specific RNTI value allocated for monitoring the scheduling DCI format of the UE, indication A separate UE-specific RNTI for DCI monitoring can be allocated via higher layer signaling.

Third Embodiment

The puncturing indication / preemption indication can be cell-specific or TTI / slot / multiple-slot specific. That is, it is possible to define that URLLC PDSCH transmission resource allocation information giving an impact on eMBB PDSCH in cell / slot / multiple-slot unit is transmitted through UE-group common control signaling. That is, the puncturing indication / preemption indication DCI format is transmitted in a slot-specific or UE-group specific manner, and an indication of the URLLC PDSCH transmission resource that is affected by the eMBB PDSCH in the corresponding slot (i.e., transmitted by puncturing the eMBB PDSCH) Can be defined to include information. To this end, a separate UE-group specific RNTI or cell-specific / slot-specific RNTI for monitoring the corresponding puncturing indication / preemption indication may be defined. The corresponding RNTI may be assigned UE-specific / cell-specific / group-specific UE layer-specific higher layer signaling, or implicitly defined as a function of slot index, cell ID, and the like.

The specific information area construction method of the cell-specific or TTI / slot / multiple-slot specific puncturing indication DCI format may follow the form of the first embodiment or the second embodiment.

That is, when the UE-group common DCI for the puncturing indication / preemption indication is configured and transmitted through the UE-group common PDCCH by the BS / network, puncturing or preemption transmitted through the corresponding puncturing indication / pre- The indication information for the created radio resource may be composed of time-division resource indication information and frequency-interval resource indication information, respectively. In addition, the time-slot resource indication information and the frequency resource section indication information may follow the contents described in the first embodiment or the second embodiment.

As a concrete example, preemption window and preemption interval (however, the present invention is not limited by name) can be defined for puncturing or preemption of time-division resource indication information. The preemption window can be determined by the period of the Preemption Indication DCI transmission period or the period of the CORESET (Control Resource Set) for the preemption indication DCI transmission. For example, when a preemption indication DCI transmission and a corresponding CORESET for notifying a preemption period of a TTI of a first UE having a long time interval scheduling unit as shown in FIG. 2 or 3 are defined, if the corresponding first TTI is preemption window. < / RTI > Alternatively, when a corresponding preemption indication signal is transmitted in units of a plurality of first PDSCH TTIs, a preemption window may be defined in units of a plurality of the first PDSCH TTIs according to the preemption indication DCI transmission / reception period. The preemption interval may be determined by a time interval scheduling unit for the second, third, and fourth PDSCH resource allocation in which preemption-based PDSCH transmission / reception is performed by puncturing a part of the first PDSCH transmission resources. That is, a corresponding preemption interval may be determined in units of PDSCH transmission / reception TTIs of the second, third, and fourth UEs. Accordingly, when setting up monitoring for a preemption indication DCI for an arbitrary terminal (e.g., the first terminal), the base station / network directly sets the preemption window information and transmits the preemption indication DCI through higher layer signaling, It is possible to define the preemption window to be derived from the UE based on the higher layer signaling transmitted to the CORESET period setting information for monitoring. Also, the setting information related to the preemption interval may be set through higher layer signaling by the base station / network as described in the first embodiment, dynamically indicated by the corresponding puncturing indication / preemption indication DCI, / preemption indication may be implicitly defined by the transmission SCS value of the PDSCH (e.g., the second, third, and fourth PDSCHs) on which the DCI or preemption based resource allocation is made.

When the preemption interval, which is the time unit of preemption, is defined in the preemption window, the preemption indication DCI is defined as the preemption interval index in which the preemption occurs in the preemption window as described in the first embodiment or the second embodiment Or to indicate the preemption interval at which the preemption occurred based on the bitmap. However, if the preemption interval index is directly indicated, a UE-group common preemption indication DCI is defined to include only the preemption indication information for one preemption interval. If preemption occurs in a plurality of preemption intervals in the corresponding preemption window , It is possible to define that a separate UE-group preemption indication DCI is configured and transmitted for each preemption interval. Also, if preemption indication DCI consists of bitmap-based preemption interval indication information, one preemption indication DCI can indicate multiple preemption intervals where preemption occurs in preemption window. In this case, preemption interval for each preemption interval An information area for generating a frequency resource indication may be separately defined and a corresponding preemption indication DCI may be configured.

As a method for constructing frequency-domain resource indication information for a radio resource that has been preempted through a pre-assignment DCI, the corresponding frequency-domain resource indication information may include RB or RBG (Resource Block Group) based bitmap instruction information. However, if the subject of the corresponding RBG or RB indication information punctured or preempted by the preemption indication DCI is set by the base station / network for the bandwidth part, that is, the UE-group common bandwidth part for preemption, And the RB or RBG indication information through the corresponding preemption indication DCI is set as the indication information for the RBs or RBGs constituting the bandwidth part for the set preemption, It can be defined to be interpreted by the terminal. Or a plurality of bandwidth parts for preemption are set by the base station and the RB or RBG indication information within the bandwidth part and the bandwidth part indication information where the preemption occurs are transmitted through the resource indication information of the preamption indication DCI can do. In this case, the SCS value defining the RB grid constituting the bandwidth part for the preemption may be set in the corresponding base station / network and transmitted through higher layer signaling, dynamically indicated through the corresponding puncturing indication / preemption indication DCI, Or the transmission SCS value of the PDSCH (e.g., the second, third, and fourth PDSCHs) in which the puncturing indication / preemption indication DCI or the preemption-based resource allocation is performed.

Alternatively, the preemption indication DCI constructs an RB or RBG indication information corresponding to the preemption target frequency resource constituting the entire NRC CC, and transmits the NR CC full bandwidth to the UE And the RB or RBG indication information based on a UE-common RB grid defined by the RBG. In this case, the SCS value defining the UE-common RB grid may also be set in the corresponding base station / network and transmitted through higher layer signaling, dynamically indicated through the corresponding puncturing indication / pre-selection indication DCI, the preamption indication may be explicitly / implicitly set by the transmission SCS value of the PDSCH (e.g., the second, third, and fourth PDSCHs) in which DCI or preemption-based resource allocation is performed.

In addition, when the frequency indicator information is configured in units of RBG, the RBG size is set by the base station / network through higher layer signaling, dynamically indicated by the corresponding puncturing indication / preemption indication DCI, or the corresponding puncturing indication / preemption indication The transmission SCS value of the PDSCH (e.g., the second, third, and fourth PDSCHs) in which the DCI or the preemption-based resource allocation is performed, and the bandwidth of the bandwidth part or the bandwidth of the NR CC for preemption.

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

Referring to FIG. 4, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The control unit 1010 controls the overall operation of the base station according to the above-described method of transmitting and receiving downlink control information for efficient downlink resource allocation according to the present invention.

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.

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

5, the 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.

Also, the controller 1120 controls the overall operation of the UE according to the above-described method of transmitting / receiving downlink control information for efficient downlink resource allocation.

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 portions of the standard documents are added to or contained in 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 method for transmitting and receiving downlink control information for efficient downlink resource allocation,
allocating downlink radio resources for data transmission of eMBB or mMTC;
Puncturing some radio resources among the downlink radio resources allocated for the eMBB or mMTC; And
And performing urgent URLLC data transmission / reception using the punctured radio resource.

Images