KR20180106859A - Methods for monitoring, transmitting and receiving a downlink preemption indication for new radio networks and Apparatuses thereof - Google Patents

Abstract

Embodiments of the present invention relate to a method of monitoring and transceiving downlink preemption indication information in a next generation/5G radio access network (also referred to as new radio (NR)). According to one embodiment, a method of receiving downlink preemption indication information by a terminal comprises the steps of: receiving monitoring setting information for the downlink preemption indication information from a base station; receiving configuration information for a control resource set (CORESET) for receiving the downlink preemption indication information from the base station; configuring a reference downlink resource based on the configuration information for the control resource set; and monitoring the downlink preemption indication information for the reference downlink resource.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for monitoring downlink preemption indication information and transmitting and receiving downlink preemption indication information in a next-

The present embodiments relate to a method for monitoring and transmitting downlink preemption indication information in a next generation / 5G radio access network (hereinafter, also referred to as NR (New Radio)).

3GPP recently approved a study item "Study on New Radio Access Technology" for studying next generation / 5G radio access technology, and based on this, RAN WG1 provides frame structure, channel coding and modulation for NR (New Radio) , Waveforms and multiple access methods. NR is required not only to improve data transmission rate in comparison with LTE / LTE-Advanced, but also to design various requirements that are required according to detailed and specific usage scenarios.

In order to meet the requirements of each scenario, LTE / LTE-Advanced has been proposed as a representative use scenario of NR. In this case, enhancement Mobile BroadBand (MMB), massive Machine Type Communication (MMTC) and Ultra Reliable and Low Latency Communications A flexible frame structure design is required.

In particular, in NR, services such as eMBB and mMTC are more efficient in terms of cell throughput and coverage, while URLLC is more efficient in terms of resource allocation because of the latency problem. Accordingly, there is a need to support efficient multiplexing of data traffic between each service in a network in which eMBB, mMTC, and URLLC services described above are mixed.

It is an object of the present embodiments to provide a concrete method for efficiently multiplexing data traffic between respective services in a network in which services with different QoS requirements such as eMBB, mMTC and URLLC services are mixed in NR I have to.

According to an embodiment of the present invention, there is provided a method of receiving downlink preemption indication information, the method comprising: receiving monitoring setting information for downlink preemption indication information from a base station; Comprising the steps of: receiving configuration information for a control resource set (CORESET) for receiving link preemption indication information; configuring a reference downlink resource based on configuration information for the control resource set; And monitoring downlink preemption indication information for the link resources.

According to another aspect of the present invention, there is provided a method for transmitting downlink preemption indication information in a base station, the method comprising: configuring monitoring setting information for downlink preemption indication information; (CORESET) to the UE, and transmitting downlink preemption indication information on the reference downlink resource to the UE.

According to another aspect of the present invention, there is provided a terminal for receiving downlink preemption indication information, the terminal for receiving downlink preemption indication information includes monitoring setting information for downlink preemption indication information from a base station, A reference downlink resource is configured based on configuration information on a control unit and a receiver for receiving configuration information for a set of CORESETs and monitoring downlink preemption indication information for a reference downlink resource And a controller for controlling the terminal.

In an exemplary embodiment of the present invention, a base station for transmitting downlink preemption indication information includes a controller for configuring monitoring setting information for downlink preemption indication information, a control resource set for transmitting downlink preemption indication information And a transmission unit for transmitting downlink preemption indication information on the reference downlink resource to the mobile station.

According to the present embodiments, a concrete scheme for supporting efficient multiplexing of data traffic between respective services in a network in which services having different QoS requirements such as eMBB, mMTC and URLLC services are mixed in NR is provided can do.

FIG. 1 illustrates the alignment of OFDM symbols in the case of using different subcarrier spacings according to the present embodiments. Referring to FIG.
FIG. 2 is a diagram illustrating a control resource set (CORESET) for transmitting preemption indication information and a preemption area corresponding to the corresponding control resource set in the present embodiment.
3 is a diagram illustrating a procedure in which a terminal receives downlink preemption indication information in the present embodiment.
4 is a diagram illustrating a procedure in which a base station transmits downlink preemption indication information in the present embodiment.
5 is a diagram illustrating a configuration of a base station according to the present embodiments.
FIG. 6 is a diagram illustrating a configuration of a user terminal according to the present embodiments.

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. In this specification, the MTC terminal supports the enhanced coverage over the existing LTE coverage, or the UE category / type defined in the existing 3GPP Release-12 or lower that supports the low power consumption, or the 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 a study item "Study on New Radio Access Technology" for studying next generation / 5G radio access technology. Based on this, 3GPP has developed frame structure, channel coding and modulation, waveform, The discussion on frame structure, channel coding & modulation, waveform & multiple access scheme, etc. has begun.

NR is required to be designed to satisfy not only the improved data transmission rate as compared to LTE / LTE-Advanced, but also various requirements that are required according to granular and specific usage scenarios. In particular, enhancement Mobile BroadBand (eMBB), massive MTC (MMTC) and Ultra Reliable and Low Latency Communications (URLLC) have been proposed as typical usage scenarios of NR, and requirements for each usage scenario have been proposed. It is required to design a flexible frame structure as compared with LTE / LTE-Advanced.

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 possible to use each frequency band constituting any NR system A radio resource unit based on different numerology (e.g., subcarrier spacing, subframe, TTI, etc.) is efficiently multiplexed as a method for efficiently satisfying requirements according to usage scenarios there is a need for a multiplexing method.

As a method for this, a numerator with different subcarrier spacing (SCS) values is multiplexed on a TDM, FDM or TDM / FDM basis via one NR carrier to support Methods and methods for supporting one or more time units in constructing scheduling units in the time domain have been discussed. In this regard, in the NR, a subframe has been defined as one type of time domain structure, and a reference numerology for defining a corresponding subframe duration has been described. We decided to define a single subframe duration consisting of 14 OFDM symbols of 15 kHz sub-carrier spacing (SCS) based normal CP overhead as LTE. Accordingly, the subframe in the NR has a time duration of 1 ms. However, unlike LTE, the subframe of the NR is an absolute reference duration, which is the time unit on which the actual uplink data scheduling is based, as a slot and a mini-slot ) Can be defined. In this case, the number of OFDM symbols constituting the corresponding slot and the y-value are determined to have a value of y = 14 irrespective of the numerator.

Accordingly, an arbitrary slot may be composed of 14 symbols, and all symbols may be used for DL transmission according to a transmission direction of the slot, or all symbols may be used for uplink transmission UL transmission, or in the form of a DL portion + a gap + an UL portion.

Also, a minislot consisting of fewer symbols than a corresponding slot is defined in an arbitrary numerology (or SCS), and based on this, a time-domain scheduling interval with a short length for transmitting / receiving data upstream / scheduling interval may be set or a long-time time-domain scheduling interval for uplink / downlink data transmission / reception through slot aggregation may be configured.

In particular, for transmission and reception of latency-critical data such as URLLC, a slot of 0.5 ms (7 symbols) or 1 ms (14 symbols) defined in a transmitter-based frame structure having a small SCS value such as 15 kHz It is difficult to satisfy the latency requirement. Therefore, a mini-slot composed of a smaller number of OFDM symbols than the corresponding slot is defined, and a corresponding URLLC And scheduling for latency critical data such as < RTI ID = 0.0 > a < / RTI >

Alternatively, as described above, multiplexers supporting different SCS values in one NR carrier are multiplexed and supported by the TDM scheme or the FDM scheme, so that the number of slots (or mini- Scheduling of data in accordance with latency requirements 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.

As such, 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 a time domain has been discussed as a method for satisfying various usage scenarios in NR . In particular, in order to satisfy the URLLC requirement, it is necessary to subdivide the scheduling unit in the time domain. However, from the eMBB point of view, an overly fragmented time-domain scheduling unit is undesirable in terms of cell throughput because it involves excessive control overhead. In terms of MMTC, a longer time-slot resource allocation structure may be more suitable for coverage enhancement.

In this embodiment, long time-domain resource allocation such as eMBB and mMTC can efficiently multiplex the data traffic of each service in a network in which services requiring short time-domain resource allocation such as URLLC are mixed. And an effective downlink data channel resource allocation method.

The embodiments described below can be applied to a terminal, a base station, and a core network entity (MME) using all mobile communication technologies. For example, the present embodiments can be applied not only to mobile communication terminals to which LTE technology is applied but also to next generation mobile communication (5G mobile communication, New-RAT) terminals, base stations, and access and mobility functions (AMFs). For convenience of explanation, the base station may denote an eNB of an LTE / E-UTRAN or a base station (CU, DU, or CU and DU) in a 5G wireless network in which a CU (Central Unit) An entity implemented as a single logical entity), or gNB.

In the scenario of using NR, URLLC is a service that supports high reliability and low latency. It is used when serious problem occurs when a delay occurs in data transmission / reception although the size of data to be transmitted / received is not large. For example, if the delay of data transmission and reception becomes large, such as an autonomous vehicle, the URLLC service can be used when human and material damage may occur due to a traffic accident.

eMBB is a service that is used when a large amount of data needs to be transmitted and received using a service supporting high-speed data transmission. For example, if a large amount of data needs to be transmitted per unit time, such as a 3D video or UHD service, the eMBB service can be used.

mMTC is a service that is used when the amount of data to be transmitted and received is not large and delay generation is not a problem but low power consumption is required. For example, in the case of sensor equipment installed to build a Smart City, the mMTC service can be used because it must operate for as long as possible with the onboard battery.

In general, one of the three services, URLLC / eMBB / mMTC, is serviced to the terminal according to the characteristics of the terminal. Hereinafter, a terminal using the URLLC service may be referred to as a URLLC terminal, a terminal using the eMBB service may be referred to as an eMBB terminal, and a terminal using the mMTC service may be referred to as a mMTC terminal. EMBB, mMTC, and URLLC can also be interpreted as eMBB terminals, mMTC terminals, and URLLC terminals, respectively.

In this embodiment, preemption means that a part of resources allocated to the eMBB or mMTC is re-allocated to the URLLC in order to satisfy the latency requirement for the URLLC when a traffic for the URLLC is generated, The term " puncturing " or " superposition ", as in the embodiment, may be expressed by the following (however, the present invention is not limited by the name). When such preemption occurs, the downlink data transmission to the eMBB terminal is discontinuously interrupted in the middle for the downlink data transmission to the URLLC terminal. Therefore, the occurrence of a preemption in the present embodiment can be interpreted as a discontinuous transmission from the viewpoint of the eMBB terminal, and the occurrence of a preemption can be regarded as the occurrence of a discontinuous transmission It is also possible to express.

At this time, because the resource allocated to the original eMBB or mMTC is used in URLLC, the eMBB terminal or mMTC terminal to which the original resource has been allocated should receive information on which resource is preempted. The downlink preemption means that a preemption occurs for the downlink resources of the UE.

The downlink preemption indication information is information for indicating to the terminal which data channel is preempted in the downlink, and can be expressed as downlink preemption notification information since it is information informing the terminal of the downlink preemption have. The downlink preemption indication information may be indicated in the form of a signal or a channel.

Hereinafter, a more specific embodiment of a method for monitoring and transmitting / receiving downlink preemption indication information between a terminal and a base station will be described in detail.

The embodiments described below may be applied individually or in any combination.

As described above, in order to support the URLLC service in the NR, a short scheduling unit (TTI, or Transmission Time Interval) capable of satisfying a latency boundary in a time domain is supported There is a need. On the other hand, in the case of eMBB or mMTC, in defining a scheduling unit in the time domain, applying a slightly longer time-domain resource allocation unit than the usage scenario of the URLLC, can be efficient in terms of control overhead and coverage.

In order to satisfy the usage scenarios of various NRs at the same time, it is necessary to use a subcarrier spacing (eg, larger subcarrier spacing such as 60 kHz, 120 kHz, etc.) which is easy to define a short time- mixed numerology that supports numerology of subcarrier spacing suitable for eMBB and mMTC (eg, 15kHz for eMBB or 3.75kHZ for mMTC) via a single NR carrier, Or a time domain scheduling unit having different lengths such as a sub-frame or a slot or a mini-slot in an NR carrier operating with any one numerology. -domain scheduling unit at the same time.

As an example of a method for this, a time / frequency resource (or a time / frequency resource (or region)) in which resource allocation is performed based on an optimal scheduling unit for each usage scenario is semi-fixed semi-static), and resource allocation can be performed using a time / frequency resource of a corresponding region according to a usage scenario for each terminal.

However, semi-static resource allocation is inefficient in terms of radio resource utilization in an environment where traffic generation is performed randomly for each usage scenario.

In order to solve this problem, when assigning a downlink data transmission resource, puncturing some radio resources among downlink radio resources allocated for data transmission of an eMBB or mMTC to transmit and receive urgent URLLC data To support eMBB / URLLC multiplexing based on dynamic puncturing (or superposition based superposition and transmission of URLLC data transmission signals for the corresponding radio resources) .

That is, an eMBB (or an eNB) that punctures (or superposes) a part of eMBB (or mMTC) downlink resources that are already on-going and on which transmission is already in progress and is used for urgent URLLC data transmission / URLLC to support dynamic resource sharing.

In other words, when more downlink data with latency critical arrives than an on-going PDSCH transmission in which resources are allocated in an arbitrary slot or a plurality of aggregated slots in a base station / network And performs puncturing on some of the on-going PDSCH transmission resources by performing a pre-emption for transmission of the corresponding latency critical PDSCH to a corresponding latency critical critical PDSCH transmission is considered.

In addition, when dynamic resource sharing based on dynamic puncturing (or superposition) between eMBB and URLLC is applied to NR downlink, puncturing is performed for URLLC data transmission, And explicitly signaling the radio resource to the eMBB terminal through a signaling method.

At this time, as an explicit signaling based indication method, a corresponding puncturing is performed in a TTI (or a slot, a mini-slot, or a merged slot) in which downlink data transmission is performed in the corresponding eMBB terminal a method of indicating puncturing information and a method of indicating puncturing through a subsequent TTI after the corresponding TTI are considered.

In this embodiment, a downlink radio resource allocation method for efficiently supporting dynamic resource sharing between eMBB / URLLC is proposed.

However, in the present embodiment, a usage scenario such as an eMBB or a URLLC is described. However, from the viewpoints of radio resource allocation and downlink data transmission / reception, the eMBB is a slot or a long slot A short-term time resource allocation such as a mini-slot or a symbol or a slot unit based on a large SCS (e.g., 60 kHz, 120 kHz) may be allocated to a terminal or a data session in which a resource allocation unit is defined. A unit may correspond to a defined terminal or data session.

Specifically, puncturing (or superposition) of a mini-slot or symbol unit is performed in a downlink data transmission resource allocated in an arbitrary slot unit or a plurality of slot units, or For on-going downlink transmissions in which puncturing (or superposition) is performed only for some frequency resources (some PRBs) in the corresponding mini-slot or symbol, It can be coped with a resource puncturing technique.

That is, a puncturing method and an explicit signaling method for a certain resource in a resource allocated for mini-slot based or symbol-based or corresponding downlink data transmission in a slot .

Accordingly, in this embodiment, the eMBB terminal or the eMBB data corresponds to downlink data transmission based on a scheduling unit based on a slot unit or a long time interval unit in which puncturing among given DL data transmission resources can be performed. The URLLC terminal or URLLC data corresponds to downlink data transmission using puncturing a part of the downlink resources allocated for the eMBB terminal or the eMBB data transmission.

Also, in the present embodiment, for convenience of description, it is assumed that an on-going PDSCH transmission resource for an (eMBB) terminal for transmission of a latency critical PDSCH (i.e., for URLLC PDSCH transmission) In case puncturing is performed, it is referred to as a dynamic puncturing indication signal for a signal of a base station to instruct the corresponding eMBB terminal, but the present invention is not limited thereto Do not. That is, the signal is referred to as a dynamic puncturing indication signal, a puncturing indication signal, a superposition indication signal or a pre-emption indication signal, Or any other form may be included in the scope of the present embodiment.

Example  1: terminal Capability ( UE  capability definition

In defining the UE capability for an arbitrary NR terminal, in defining the downlink data reception capability of the corresponding terminal, time critical in the NR PDSCH resource allocated for the corresponding terminal, (Or superposition-based) dynamic resource sharing for downlink data transmission of one terminal to another terminal.

Or puncturing some of the radio resources for which a PDSCH for an arbitrary UE is being transmitted for transmission of a time critical PDSCH in the NR cell / base station (or in case of puncturing a part of the radio resources critical PDSCH transmission signal is additionally transmitted on the basis of superposition). At this time, whether to support explicit puncturing indication signaling for informing the corresponding terminal or not based on the explicit puncturing indication information, demodulation and decoding based on PDSCH reception except for a pre-empted resource for fast data transmission and quick recovery capability based on the demodulation and decoding based on reception of pre- Can be defined.

Example  2. Dynamic Punting mode  Dynamic puncturing mode configuration

Method 1. Explicit Signaling Explicit signaling ) How to set the base

When a downlink data channel resource is allocated for an arbitrary UE in a corresponding cell, an arbitrary NR base station / cell / TRP allocates some resources (mini-slot units) within a TTI defined (or set) Specific or UE-group specific to the corresponding UE by setting up a dynamic puncturing support for a symbol unit or a time-frequency resource unit) Or through cell-specific higher layer signaling.

As described above, dynamic puncturing for PDSCH transmission is performed through higher layer signaling that is UE-specific / UE-group specific UE-group specific ), The corresponding UE may transmit the PDSCH within the TTI in which the corresponding PDSCH is received or in the downlink control channel of the subsequent TTI according to an explicit signaling method for instructing dynamic puncturing, The UE can monitor the control information indicating dynamic puncturing of the PDSCH transmission resource through the PDSCH transmission resource.

Alternatively, any NR base station / cell / transmission / reception point (TRP) may allocate some resource (MIN) within a defined (or set) TTI for that terminal in a downlink data channel resource allocation for any terminal in the cell - Dynamic puncturing support for slot-unit, symbol-by-symbol unit, or part of time-frequency resource) is set and transmitted to the corresponding terminal through L1 / L2 control signaling .

That is, when downlink data scheduling control information for an arbitrary UE, that is, DL assignment DCI (Downlink Control Information) is transmitted through an NR PDCCH that is an L1 control channel, resource allocation Information and whether to support dynamic puncturing for transmission of URLLC terminal data during on-going transmission for the PDSCH can be defined to be included in the corresponding DCI.

When dynamic puncturing support is set for each PDSCH transmission through the DL assignment DCI, the UE performs explicit puncturing for instructing dynamic puncturing, May perform monitoring to receive control information indicating dynamic puncturing for a corresponding PDSCH transmission resource within a TTI in which PDSCH reception is performed or on a downlink control channel of a subsequent TTI according to a method have.

As another method, whether to support dynamic puncturing can be set as a combination of higher layer signaling and L1 / L2 control signaling described above. In other words, any NR base station / cell / transmission / reception point (TRP) can be configured to support dynamic puncturing for UEs in a corresponding cell by UE-specific / cell- - Set up primarily through higher layer signaling, which is UE-group specific.

If the dynamic puncturing mode support is set for an arbitrary UE through the higher layer signaling, the NRP base station / cell / transmission / reception point (TRP) transmits PDSCH for the corresponding UE The UE may additionally include configuration information for dynamic puncturing in the PDSCH transmission / reception TTI allocated through the corresponding DL assignment DCI to allocate resources to the UE.

That is, a UE having a dynamic puncturing mode set through a higher layer signaling transmits a downlink allocation request including dynamic puncturing support setting information in a corresponding PDSCH reception TTI, And performs dynamic puncturing for the corresponding PDSCH according to dynamic puncturing support setting information in the corresponding DL assignment DCI format. It can be defined to judge whether it is possible.

As described above, a UE-specific cell-specific / UE-group specific higher layer signaling and a DL assignment DCI When the dynamic puncturing support for the PDSCH transmission is set up, the UE transmits a TTI in which PDSCH reception is performed according to an explicit signaling method for instructing dynamic puncturing Or control information indicating dynamic puncturing for the corresponding PDSCH transmission resource, through the downlink control channel of the subsequent TTI.

In addition, for the dynamic puncturing mode setting methods described above, the dynamic puncturing mode setting through it may be set to a value within the TTI or a subsequent TTI for indicating the dynamic puncturing And may be interpreted as setting whether to monitor for explicit signaling over the network.

That is, as described above, i) UE-specific cell-specific / UE-group specific higher layer signaling, Whether a dynamic puncturing indication signal or a pre-emption indication signal is monitored or ii) a dynamic puncturing indication signal through L1 control signaling, Specific or cell-specific / UE-group-specific (eg, pre-emptive indication signal) A combination of layer signaling and L1 control signaling may be used to monitor the dynamic puncturing indication signal or the pre-emption indication signal. You can set whether ringhal.

However, when a dynamic puncturing indication signal or a pre-emption indication signal is monitored for an arbitrary terminal through the above-described method, a corresponding pre-emption signal (pre-emption signal) a setting of a monitoring time for an indication signal can be made.

For example, a transmission time point or a preemption indication signal for a pre-emption indication signal for a PDSCH transmitted through a corresponding slot or aggregated slots for each slot or aggregate slots, a transmission period for a pre-assignment indication signal is set by the base station and is used for UE-specific / cell-specific / UE-group specific upper layer signaling (higher layer signaling) or may be set implicitly.

For example, a certain timing gap (eg, K slots, K is an arbitrary integer) between a PDSCH transmission slot and a pre-emphasis indication signal through each slot or aggregated slots Can be defined.

Considering the case where the setup information related to the transmission timing of the pre-emption indication signal such as the transmission time point or the period of the pre-emption indication signal is set by the base station or defined implicitly do. In this case, the UE set to monitor the pre-emption indication signal is able to transmit the pre-emption indication signal regardless of the transmission time point setting of the pre-emption indication signal for each slot or aggregated slots, A pre-assignment indication signal corresponding to a slot or aggregated slots to which a PDSCH for the corresponding UE has been transmitted or a pre-assignment indication signal defined at that time It can be defined to perform monitoring for a pre-emption indication signal only for a control resource set (CORESET) or a search space (search space).

That is, when a base station / network is set to monitor a signal for a puncturing indication or a preemption indication for an arbitrary terminal, a corresponding puncturing indication or preemption indication is set, (UE-specific) / cell-specific / UE-group specific (higher layer signaling) by setting a control resource set (CORESET) (higher layer signaling) to the UE.

As a specific example, the puncturing indication information or the preemption indication information may be composed of a group common DCI and transmitted to the UE through the PDCCH. In this case, a group common preemption indication is a control resource set (CORESET) for monitoring the DCI, that is, a group common CORESET for preemption indication for preemption indication The embodiment is not limited by name) may be transmitted to each terminal through higher layer signaling by the base station / network.

In this case, the group common CORESET for preemption indication for the preemption indication may be defined to have a one-to-one correspondence with the preemption region as shown in FIG.

Referring to FIG. 2, a group common CORESET for preemption indication # 1 for preemption indication may be transmitted to the UE every three slots, and each control resource set CORESET may be controlled And may correspond to a preemption region consisting of three slots immediately before the slot to which the resource set belongs.

On the other hand, in the case of the group common CORESET for preemption indication # 2 for preemption indication, the control resource set (CORESET) may be transmitted to the UE every 1 slot period, And may correspond to a preemption region composed of one slot immediately before the slot.

At this time, a bandwidth part (BP) of the group common CORESET for preemption indication # 1 for preemption indication and a group common CORESET for preemption indication for preemption indication ) The bandwidth part (BP) of # 2 is included in the bandwidth of the component carrier (CC) of the NR, and may be different from each other.

Accordingly, a preemption indication DCI transmitted through a group common CORESET for preemption indication for a preemption indication configured in an arbitrary slot is punctured in a corresponding preemption region, ) Or a time / frequency radio resource information in which a preemption occurs.

To this end, the setting information for the group common CORESET for preemption indication is time / frequency resource allocation information in which the corresponding control resource set (CORESET) is configured in an arbitrary slot, A time for constructing a preemption region corresponding to a group common control resource set for the corresponding preemption indication as well as symbol allocation information and PRB allocation information in which CORESET is configured, / Frequency range setting information.

For example, the time period setting information for the preemption region configuration can be defined to be determined by the period setting information of the group common COMMESET for preemption indication for preemption indication.

That is, when the period of the group common CORESET for preemption indication for preemption indication is set to K, the group common CORESET for preemption indication for the corresponding preemption indication is K A preemption region corresponding to a group common CORESET for preemption indication for a corresponding preemption indication configured in an arbitrary slot #n is configured in a slot # (n-K) to # (n-1), or may be defined to be configured through K slots of slots # (n-K + 1) to #n.

That is, a UE receiving preemption indication information transmitted through a group-common control resource set configured in an arbitrary slot #n constitutes a set of symbols constituting K slots preceding the UE, i.e., a group-common control resource set It is possible to define that the preemption area for indicating the preemption is constituted by the sets of 14K symbols preceding the first symbol. At this time, the value of K is higher than UE-specific / cell-specific / UE-group specific higher layer signaling (ex. RRC signaling) Lt; / RTI >

Also, when setting a group common CORESET for preemption indication for the preemption indication for setting a frequency interval for the preemption region, a group common control resource set for the corresponding preemption indication and a bandwidth part setting information of a preemption region corresponding to a group common CORESET for preemption indication. For example, the bandwidth part setting information for setting the frequency interval of the preemption area can be defined to be determined by the active bandwidth part of the terminal in a manner similar to the above-mentioned time period setting information.

The configuration information for the group common CORESET for preemption indication may include time / frequency resource configuration information in which the corresponding control resource set (CORESET) is configured, and may also include an implicit A preemption indication DCI transmitted via a group common CORESET for preemption indication for the corresponding preemption indication may be puncturing or preemption. And may include setting information for a preemption region in which a radio resource is indicated.

In addition, the group common CORESET for preemption indication configuration information for preemption indication may include RNTI configuration information for preemption indication DCI monitoring in the corresponding control resource set CORESET.

In addition, for a UE set to monitor a preemption indication, a group common CORESET for preemption indication for one or more preemption indication may be established, A preemption area (CORESET) corresponding to each control resource set (CORESET) for one or a plurality of control resource sets (CORESET) configured according to setting information for a group common CORESET for preemption indication for preemption indication the preemption indication DCI may be defined to be monitored in the corresponding control resource set CORESET only when a PDSCH resource allocation in which all or a part of the PDSCH resource allocation overlaps with the preemption region is performed.

That is, any terminal configured to monitor preemption indication information may receive a preemption indication DCI according to the setting information for a group common CORESET for preemption indication for preemption indication A method of monitoring a corresponding control resource set CORESET in order to control a control resource set CORESET corresponding to a control resource set CORESET even when a control resource set CORESET for a preemption indication is configured in an arbitrary slot, if a PDSCH resource in which all or a part of the PDSCH resource is not allocated to the preemption region or the PDSCH is not received in the preamble region is not allocated, preemption indication It is possible to define not to perform monitoring to receive DCI.

In addition, in the case where the TTI length configured for the corresponding terminal is one or more for any terminal for which the dynamic puncturing mode is set in the first and second embodiments described above, dynamic puncturing can be applied May be determined using a function of the TTI length for which any PDSCH allocation has been made.

As an example of this, if a threshold value for a certain PDSCH transmission / reception TTI is defined and a dynamic puncturing mode is set only for a terminal or a PDSCH transmission / reception where a TTI exceeding a threshold value is set, Can be defined so that dynamic puncturing can be supported. On the other hand, for a terminal or a PDSCH transmission / reception where a TTI smaller than a threshold value is set, the dynamic puncturing mode is not set or the dynamic puncturing mode is set regardless of the setting of the dynamic puncturing mode It is also possible to define that dynamic puncturing is not supported.

At this time, the corresponding threshold value may be set by the base station, or may have any fixed value. The threshold value may also be defined as an absolute time unit (eg X ms, where X is any positive number) or a symbol unit that constitutes a TTI for each subcarrier spacing (SCS). eg X OFDM symbol for 15 kHz SCS, Y OFDM symbol for 30 kHz SCS, etc.)

3 is a diagram illustrating a procedure in which a terminal receives downlink preemption indication information in the present embodiment.

Referring to FIG. 3, the terminal may receive monitoring setting information for downlink preemption indication information from the base station (S300). In this case, the monitoring setting information may include information on whether to monitor the downlink preemption indication. This may be a UE-specific / cell-specific, as described in the second embodiment. / UE-group specific higher layer signaling (e.g., RRC signaling).

That is, information on whether to monitor the downlink preemption indication information or not to monitor the downlink preemption indication information used to indicate whether the terminal has generated the downlink preemption can be included in the monitoring setting information. For example, in the case of an eMBB terminal, it is necessary to monitor the downlink preemption indication information because there is a possibility that the resource allocated to itself is preempted by the URLLC terminal. However, in the case of the URLLC terminal, it may not be necessary to monitor the downlink preemption indication information because there is no possibility that the resource allocated to the terminal is preempted by other terminals.

In addition, the terminal may receive configuration information on a control resource set (CORESET) for receiving downlink preemption indication information from the base station (S310).

In step S320, the UE may configure a reference downlink resource based on the configuration information on the control resource set (CORESET) received in step S310.

Here, the reference downlink resource refers to a resource that is a preemption target, and refers to a resource expressed as a preemption region in the second embodiment.

At this time, the time interval of the reference downlink resource may be determined according to a period of monitoring the control resource set (CORESET), which may include information indicating the preemption, as described above. For example, as described in the second embodiment, when the time interval of the reference downlink resource is K slots, the value of K is equal to the monitoring period for the control resource set (CORESET) in which the information indicating the preemption can be included . The frequency interval of the reference downlink resource may be determined by the active bandwidth part of the terminal.

In addition, the terminal can monitor downlink preemption indication information on the reference downlink resource (S330).

At this time, the downlink preemption indication information may be indicated through a group-common DCI. A group-common DCI can be transmitted to the UE through a downlink control channel (PDCCH), which is a group common control resource set for the preemption indication described in the second embodiment. ). ≪ / RTI >

When the UE monitors a control resource set (CORESET) that can include information indicating a preemption point to receive downlink preemption indication information, the UE transmits a Downlink Data Prefix (PDSCH) as described in the second embodiment, ) Is allocated to all of the time zones and the reference downlink resources are overlapped with each other, the downlink preemption indication information can be monitored.

That is, when the UE does not have a downlink data channel (PDSCH) allocated to itself among the resources in the reference downlink resource, there is no resource to be preempted, so it is unnecessary to check whether the downlink is preempted. Therefore, in this case, the terminal may not monitor the downlink preemption indication information.

4 is a diagram illustrating a procedure in which a base station transmits downlink preemption indication information in the present embodiment.

Referring to FIG. 4, the base station can configure monitoring setting information for downlink preemption indication information (S400). In this case, the monitoring setting information may include information on whether to monitor the downlink preemption indication as described with reference to FIG. 3. This is because the UE-specific / cell- And may be transmitted to the UE through higher layer signaling specific to a cell-specific / UE-group specific.

In addition, the base station may transmit configuration information on a control resource set (CORESET) for transmitting downlink preemption indication information to the terminal (S410). At this time, the downlink preemption indication information may be transmitted to the terminal through a group-common DCI. A group-common DCI can be transmitted to the UE through a downlink control channel (PDCCH), which is a group common control resource set for the preemption indication described in the second embodiment. ). ≪ / RTI >

Accordingly, the UE receiving the configuration information on the control resource set CORESET from the BS can monitor the control resource set and confirm the downlink preemption indication information.

In addition, the base station may transmit the downlink preemption indication information for the reference downlink resource to the terminal (S420).

Here, the reference downlink resource refers to a resource that is a preemption target, and refers to an area represented by a preemption region in the second embodiment.

At this time, the time interval of the reference downlink resource can be determined according to the monitoring period for the control resource set (CORESET) that may include the information indicating the preemption as described above. For example, as described in the second embodiment, when the time interval of the reference downlink resource is K slots, the value of K is equal to the monitoring period for the control resource set (CORESET) in which the information indicating the preemption can be included . The frequency interval of the reference downlink resource may be determined by the active bandwidth part of the terminal.

5 is a diagram illustrating a configuration of a base station according to the present embodiments.

5, the base station 500 includes a control unit 510, a transmission unit 520, and a reception unit 530.

The control unit 510 may configure monitoring setting information for downlink preemption indication information. At this time, as described above, the monitoring setting information may include information on whether to monitor the downlink preemption indication information. This information can be used for UE-specific / cell-specific / UE-group specific higher layer signaling as described in the second embodiment. Lt; / RTI >

The transmitting unit 520 and the receiving unit 530 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

Specifically, the transmitter 520 transmits configuration information on a control resource set (CORESET) for transmitting downlink preemption indication information to the terminal, and transmits downlink preemption indication information on the reference downlink resource to the terminal.

At this time, the downlink preemption indication information may be transmitted to the terminal through a group-common DCI. A group-common DCI can be transmitted to the UE through a downlink control channel (PDCCH), which is a group common control resource set for the preemption indication described in the second embodiment. ). ≪ / RTI >

Accordingly, the UE receiving the configuration information on the control resource set CORESET from the BS can monitor the control resource set and confirm the downlink preemption indication information.

Here, the reference downlink resource refers to a resource that is a preemption target, and refers to an area represented by a preemption region in the second embodiment.

At this time, the time interval of the reference downlink resource can be determined according to the monitoring period for the control resource set (CORESET) that may include the information indicating the preemption as described above. For example, as described in the second embodiment, when the time interval of the reference downlink resource is K slots, the value of K is equal to the monitoring period for the control resource set (CORESET) in which the information indicating the preemption can be included . The frequency interval of the reference downlink resource may be determined by the active bandwidth part of the terminal.

FIG. 6 is a diagram illustrating a configuration of a user terminal according to the present embodiments.

6, the user terminal 600 includes a receiving unit 610, a control unit 620, and a transmitting unit 630.

The receiving unit 610 receives downlink control information, data, and a message from the base station through the corresponding channel. Specifically, the receiver 610 may receive monitoring configuration information for downlink preemption indication information from the base station and configuration information for a control resource set (CORESET) for receiving downlink preemption indication information from the base station.

In this case, as described above, the monitoring setting information may include information on whether to monitor the downlink preemption indication, which may be UE-specific / cell-specific (as described in the second embodiment) cell-specific / UE-group specific higher layer signaling to the UE.

The controller 620 configures a reference downlink resource based on the configuration information on the control resource set and monitors downlink preemption indication information on the reference downlink resource.

Here, the reference downlink resource refers to a resource that is a preemption target, and refers to a resource represented by a preemption region in the above-described second embodiment. As described above, The time interval of the reference downlink resource can be determined according to the period of monitoring the control resource set (CORESET). For example, as described in the second embodiment, when the time interval of the reference downlink resource is K slots, the value of K is equal to the monitoring period for the control resource set (CORESET) in which the information indicating the preemption can be included . The frequency interval of the reference downlink resource may be determined by the active bandwidth part of the terminal.

The downlink preemption indication information may be indicated through a group-common DCI. A group-common DCI can be transmitted to the UE through a downlink control channel (PDCCH), which is a group common control resource set for the preemption indication described in the second embodiment indication.

When the UE monitors a control resource set (CORESET) that can include information indicating a preemption point to receive downlink preemption indication information, the UE transmits a Downlink Data Prefix (PDSCH) as described in the second embodiment, ) Is allocated to all of the time zones and the reference downlink resources are overlapped with each other, the downlink preemption indication information can be monitored.

That is, when the UE does not have a downlink data channel (PDSCH) allocated to itself among the resources in the reference downlink resource, there is no resource to be preempted, so it is unnecessary to check whether the downlink is preempted. Therefore, in this case, the terminal may not monitor the downlink preemption indication information.

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 (24)

A method for a terminal to receive downlink preemption indication information,
Receiving monitoring setting information for downlink preemption indication information from a base station;
Receiving configuration information on a control resource set (CORESET) for receiving downlink preemption indication information from the base station;
Configuring a reference downlink resource for downlink preemption indication based on the configuration information for the control resource set; And
And monitoring downlink preemption indication information on the reference downlink resource.
The method according to claim 1,
The monitoring setting information includes:
Lt; RTI ID = 0.0 > higher layer signaling. ≪ / RTI >
The method according to claim 1,
The downlink preemption indication information includes:
Group-common < / RTI > DCI.
The method according to claim 1,
The time period of the reference downlink resource may be determined based on,
And the monitoring period for the control resource set.
The method according to claim 1,
The time period of the reference downlink resource may be determined based on,
Wherein the control resource set comprises 14K symbols immediately before the first symbol constituting the control resource set, for a monitoring period K for the control resource set.
The method according to claim 1,
The frequency interval of the reference downlink resource may be,
And a physical resource block constituting an activated bandwidth part.
A method for transmitting downlink preemption indication information by a base station,
Configuring monitoring setting information for downlink preemption indication information;
Transmitting configuration information on a control resource set (CORESET) for transmitting the downlink preemption indication information to a terminal; And
And transmitting downlink preemption indication information for a reference downlink resource to the terminal.
8. The method of claim 7,
The monitoring setting information includes:
RRC signaling to the terminal.
8. The method of claim 7,
The downlink preemption indication information includes:
To the terminal through a group-common DCI.
8. The method of claim 7,
The time period of the reference downlink resource may be determined based on,
And the monitoring period for the control resource set.
8. The method of claim 7,
The time period of the reference downlink resource may be determined based on,
Wherein the control resource set comprises 14K symbols immediately before the first symbol constituting the control resource set, for a monitoring period K for the control resource set.
8. The method of claim 7,
The frequency interval of the reference downlink resource may be,
And a physical resource block constituting an activated bandwidth part.
A terminal for receiving downlink preemption indication information,
A receiving unit for receiving monitoring configuration information for downlink preemption indication information from a base station and receiving configuration information for a control resource set (CORESET) for receiving downlink preemption indication information from the base station; And
And a controller for configuring a reference downlink resource for downlink preemption indication based on the configuration information for the control resource set and for monitoring downlink preemption indication information for the reference downlink resource, .
14. The method of claim 13,
The monitoring setting information includes:
And is indicated via upper layer signaling.
14. The method of claim 13,
The downlink preemption indication information includes:
And is directed via a group-common DCI.
14. The method of claim 13,
The time period of the reference downlink resource may be determined based on,
And a monitoring period for the control resource set.
14. The method of claim 13,
The time period of the reference downlink resource may be determined based on,
Wherein the control resource set comprises 14K symbols immediately before the first symbol constituting the control resource set with respect to the monitoring period K for the control resource set.
14. The method of claim 13,
The frequency interval of the reference downlink resource may be,
And a physical resource block constituting an active bandwidth part.
A base station for transmitting downlink preemption indication information,
A controller configured to configure monitoring setting information for downlink preemption indication information; And
And a transmitter for transmitting configuration information on a control resource set (CORESET) for transmitting the downlink preemption indication information to a terminal and transmitting downlink preemption indication information on a reference downlink resource to the terminal .
20. The method of claim 19,
The monitoring setting information includes:
RRC signaling to the terminal.
20. The method of claim 19,
The downlink preemption indication information includes:
And is transmitted to the terminal through a group-common DCI.
20. The method of claim 19,
The time period of the reference downlink resource may be determined based on,
Wherein the control resource is consistent with a monitoring period for the control resource set.
20. The method of claim 19,
The time period of the reference downlink resource may be determined based on,
Wherein the control resource set comprises 14K symbols immediately before the first symbol constituting the control resource set with respect to the monitoring period K for the control resource set.
20. The method of claim 19,
The frequency interval of the reference downlink resource may be,
And a physical resource block constituting an active bandwidth part.

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