WO2018093162A1

WO2018093162A1 - Method and apparatus for transmitting and receiving downlink signal in next generation wireless network

Info

Publication number: WO2018093162A1
Application number: PCT/KR2017/012992
Authority: WO
Inventors: 박규진; 최우진
Original assignee: 주식회사 케이티
Priority date: 2016-11-16
Filing date: 2017-11-16
Publication date: 2018-05-24
Also published as: CN116709539A

Abstract

The present invention relates to a method and apparatus for transmitting and receiving a downlink signal for supporting effective multiplexing between data traffic having mutually different QoS requirements in a next generation/5G wireless access network ("New Radio" (NR)) for which discussion has begun in 3GPP. A method for a terminal receiving a downlink signal according to one embodiment comprises the steps of: receiving configuration data for receiving downlink pre-emption indication data from a base station; monitoring the downlink pre-emption indication data on the basis of the configuration data; and receiving the downlink pre-emption indication data by means of a multicast or unicast signal, wherein the downlink pre-emption indication data comprises data for indicating the overlapping wireless resource between a wireless resource for providing a first service, and a wireless resource for providing a second service.

Description

Method and apparatus for transmitting / receiving downlink signal in next generation wireless network

The present invention is directed to supporting efficient multiplexing between data traffic having different QoS requirements in a next generation / 5G wireless access network (hereinafter referred to as "NR"), which has been discussed in 3GPP. The present invention relates to a method and apparatus for transmitting and receiving link signals.

3GPP recently approved a study item "Study on New Radio Access Technology" for the study of next generation / 5G radio access technology, and based on this, RAN WG1 has frame structure, channel coding and modulation for NR (New Radio) respectively. Discussions on waveforms and multiple access schemes are underway. NR is required to be designed to meet various requirements required for each segmented and detailed usage scenario as well as improved data rate in preparation for LTE / LTE-Advanced.

As representative usage scenarios of NR, enhancement Mobile BroadBand (eMBB), massive machine type communication (MMTC) and Ultra Reliable and Low Latency Communications (URLLC) have been raised, and LTE / LTE-Advanced preparation to meet the needs of each usage scenario. Flexible frame structure design is required.

However, in order to satisfy such various usage scenarios, it is necessary to satisfy various requirements required for each scenario. For example, URLLC versus eMBB needs to satisfy fast data transmission and reception.

However, since resources for transmitting and receiving wireless data are limited, there are limitations in efficiently allocating resources while satisfying each scenario. That is, in terms of efficiency, it is necessary to provide a service to a wide range of terminals by allocating long time duration resources in the case of eMBB, while it is necessary to allocate short time duration resources for low latency in the case of URLLC.

In such a situation, there is a need to multiplex radio resources suitable for each scenario by using a limited radio resource, and a study on a specific radio signal transmission / reception method for providing this is required.

An object of the present embodiments is to provide a concrete scheme for providing each service to a plurality of terminals by efficiently allocating limited radio resources in a situation where each service scenario is mixed.

According to an embodiment of the present invention, a method for receiving a downlink signal by a terminal includes receiving configuration information for receiving downlink preemption information from a base station and performing downlink based on the configuration information. Monitoring link preemption information and receiving downlink preemption information through a multicast or unicast signal, wherein the downlink preemption information includes a radio resource for providing a first service and a second service; Provided is a method including information for indicating an overlapping radio resource of a radio resource for providing.

In addition, according to an embodiment of the present invention, a method for transmitting a downlink signal by a base station includes configuring configuration information for monitoring downlink preemption information, transmitting configuration information to a terminal, and based on the configuration information. And transmitting the preemptive indication information through a multicast or unicast signal, wherein the downlink preemptive indication information includes overlapping radio resources of radio resources for providing a first service and radio resources for providing a second service. It provides a method including information for indicating.

In addition, an embodiment includes a terminal for receiving a downlink signal, a receiver for receiving configuration information for receiving downlink preemption information from a base station, and a control unit for monitoring downlink preemption information based on the configuration information. Wherein, the receiving unit receives the downlink preemption information through a multicast or unicast signal, the downlink preemption information is overlapping radio resources for providing a first service and radio resources for providing a second service Provided is a terminal including information for indicating a resource.

In addition, according to an embodiment of the present invention, a base station transmitting a downlink signal transmits a control unit and setting information constituting setting information for monitoring downlink preemption indication information to a terminal, and based on the setting information, downlink preemption indication information. It includes a transmitter for transmitting through a multicast or unicast signal, the downlink preemption indication information for indicating a radio resource overlapping a radio resource for providing a first service and a radio resource for providing a second service Provides a base station that contains information.

According to the present embodiments, there is an effect of providing efficient multiplexing of data traffic between each service in a network in which each service scenario is mixed.

In addition, each terminal multiplexes radio resources to provide an effect of preventing unnecessary processing and data loss in receiving downlink data.

1 is a diagram illustrating alignment of OFDM symbols in the case of using different subcarrier spacings according to the present embodiments.

FIG. 2 is a diagram illustrating a method for transmitting downlink preemption information to a terminal through a pre-notification or post-notification method according to the embodiments.

3 is a diagram illustrating radio resource multiplexing for different services according to an embodiment.

4 is a diagram illustrating radio resource multiplexing for different services according to another embodiment.

5 is a diagram illustrating an operation of a terminal according to an exemplary embodiment.

6 is a diagram illustrating an operation of a base station according to an exemplary embodiment.

7 is a diagram illustrating a configuration of a terminal according to an embodiment.

8 is a diagram illustrating a configuration of a base station according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In the present specification, the wireless communication system refers to a system for providing various communication services such as voice and packet data. The wireless communication system includes a user equipment (UE) and a base station (BS).

A user terminal is a comprehensive concept of a terminal in a wireless communication, and includes a user equipment (UE) in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio), as well as a mobile station (MS) and a UT in GSM. It should be interpreted as a concept that includes a user terminal, a subscriber station (SS), and a wireless device.

A base station or cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an eNB, a gNode-B, and a Low Power Node. ), Sector, site, various types of antennas, base transceiver system (BTS), access point, access point (for example, transmission point, reception point, transmission / reception point), relay node ( It is meant to encompass various coverage areas such as a relay node, a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a remote radio head (RRH), a radio unit (RU), and a small cell.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two meanings. 1) the device providing the mega cell, the macro cell, the micro cell, the pico cell, the femto cell, the small cell in relation to the wireless area, or 2) the wireless area itself. In 1) all devices that provide a given radio area are controlled by the same entity or interact with each other to cooperatively configure the radio area to the base station. According to the configuration of the wireless area, a point, a transmission point, a transmission point, a reception point, and the like become one embodiment of a base station. In 2), the base station may indicate the radio area itself that receives or transmits a signal from the viewpoint of the user terminal or the position of a neighboring base station.

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

In the present specification, the user terminal and the base station are used in a comprehensive sense as two entities (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 the terms or words specifically referred to. Do not.

Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, and use a frequency division duplex (FDD) scheme, a TDD scheme, and an FDD scheme, which are transmitted using different frequencies. Mixed mode may be used.

In addition, in a wireless communication system, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.

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), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like. It is composed of the same data channel to transmit data.

Downlink (downlink) may mean a communication or communication path from the multiple transmission and reception points to the terminal, uplink (uplink) may mean a communication or communication path from the terminal to the multiple transmission and reception points. In this case, in the downlink, the transmitter may be part of multiple transmission / reception points, and the receiver may be part of the terminal. In addition, in uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.'

Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.

The base station performs downlink transmission to the terminals. The base station transmits downlink control information such as scheduling required for reception of a downlink data channel, which is a main physical channel for unicast transmission, and a physical downlink for transmitting scheduling grant information for transmission on an uplink data channel. The control channel can be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

There is no limitation on the multiple access scheme applied in the wireless communication system. Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA), OFDM-TDMA, OFDM-FDMA, Various multiple access techniques such as OFDM-CDMA can be used. Here, the NOMA includes a sparse code multiple access (SCMA) and a low density spreading (LDS).

One embodiment of the present invention is for asynchronous radio communication evolving to LTE / LTE-Advanced, IMT-2020 via GSM, WCDMA, HSPA, and synchronous radio communication evolving to CDMA, CDMA-2000 and UMB. Can be applied.

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

In other words, in the present specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations. Alternatively, in the present specification, the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or supporting low power consumption). low complexity) can mean UE category / type. Or, it may mean a further Enhanced MTC terminal defined in Release-14.

In this specification, a NB-IoT (NarrowBand Internet of Things) terminal refers to a terminal that supports radio access for cellular IoT. The objectives of NB-IoT technology include improved Indoor coverage, support for large scale low speed terminals, low sensitivity, low cost terminal cost, low power consumption, and optimized network architecture.

* As a typical usage scenario for NR (New Radio), which is recently discussed in 3GPP, enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (MMTC), and Ultra Reliable and Low Latency Communication (URLLC) are being raised.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio). May be interpreted as meaning used in the past or present, or various meanings used in the future.

NR(New Radio)NR (New Radio)

3GPP recently approved a study item "Study on New Radio Access Technology" for the study of next-generation / 5G radio access technologies, and based on this, frame structure, channel coding and modulation, waveform and Discussions on multiple access schemes (frame structure, channel coding & modulation, waveform & multiple access scheme) have begun.

The NR is required to be designed to meet various requirements required for each detailed and detailed usage scenario as well as an improved data rate compared to LTE / LTE-Advanced. In particular, as a typical usage scenario for NR, enhancement Mobile BroadBand (eMBB), massive MTC (MMTC), and Ultra Reliable and Low Latency Communications (URLLC) were raised, and requirements for each usage scenario were identified. As a method for satisfying the requirements, a flexible frame structure design has been required in comparison to LTE / LTE-Advanced.

Specifically, eMBB, mMTC and URLLC are considered as a typical usage scenario of NR under discussion in 3GPP. Each usage scenario has different requirements for data rates, latency, coverage, and so on, so each usage scenario uses frequency bands that make up any NR system. Effectively multiplexing radio resource units based on different numerology (eg subcarrier spacing, subframe, TTI, etc.) as a method for efficiently satisfying requirements for each scenario. There is a need for a method of multiplexing.

As one method for this, multiplexing based on TDM, FDM or TDM / FDM through a single NR carrier for numerology having different subcarrier spacing (SCS) values There has been discussion of methods and methods for supporting one or more time units in constructing scheduling units in the time domain. In this regard, in NR, a subframe is defined as a kind of time domain structure, and reference numerology is used to define a subframe duration. As the LTE, it was decided to define a single subframe duration consisting of 14 OFDM symbols of the same 15kHz sub-carrier spacing (SCS) based normal CP overhead. Accordingly, in NR, the subframe has a time duration of 1 ms. However, unlike LTE, subframes of NR are absolute reference time durations, and slots and mini-slots are time units based on actual uplink / downlink data scheduling. ) Can be defined. In this case, the number of OFDM symbols and the y value constituting the slot are determined to have a value of y = 14 regardless of the neuralology.

Accordingly, any slot may consist of 14 symbols, and all symbols may be used for DL transmission or all symbols may be uplink transmission according to the transmission direction of the slot. It may be used for UL transmission, or in the form of a DL portion + gap + uplink portion (UL portion).

In addition, a short slot time-domain scheduling interval for transmitting / receiving up / down link data is defined based on a mini-slot consisting of fewer symbols than a corresponding slot in a random number (numerology) (or SCS). A scheduling interval may be set or a long time-domain scheduling interval for transmitting and receiving uplink / downlink data through slot aggregation may be configured.

In particular, in case of transmission / reception of delay critical data such as URLLC, slots based on 0.5 ms (7 symbols) or 1 ms (14 symbols) defined in a neuralology-based frame structure having a small SCS value such as 15 kHz If the scheduling is performed in units, it may be difficult to satisfy the latency requirement, so for this purpose, a mini-slot consisting of fewer OFDM symbols than the corresponding slot is defined and the corresponding URLLC is used based on this. It may be defined that scheduling for delay critical data such as is performed.

Alternatively, as described above, by supporting multiplexers with different SCS values in one NR carrier by TDM or FDM, based on slot (or mini-slot) lengths defined for each neuron. Scheduling data according to latency requirements is also being considered. For example, as shown in FIG. 1, when the SCS is 60 kHz, since the symbol length is reduced by about 1/4 compared to the case of the SCS 15 kHz, when the same slot is configured with 7 OFDM symbols, the slot length based on the 15 kHz is While 0.5 ms, the slot length based on 60 kHz is reduced to about 0.125 ms.

As described above, the NR discusses how to satisfy the requirements of URLLC and eMBB by defining different SCSs or different TTI lengths.

As described above, in order to support the URLLC service in NR, it is necessary to support a short scheduling unit or a transmission time interval (TTI) that can satisfy a latency boundary in a time domain. On the other hand, in the case of eMBB or mMTC, applying a time interval resource allocation unit that is slightly longer than the URLLC usage scenario in defining a scheduling unit in the time domain may control overhead and coverage. Can be efficient in terms of As a way to simultaneously satisfy these various NR usage scenarios, it is easy to define a short time interval resource allocation unit suitable for URLLC. Subcarrier spacing (e.g., larger subcarrier spacing such as 60kHz, 120kHz, etc.) Supports mixed numerology structures that support numerology of subcarrier spacing (eg 15kHz for eMBB or 3.75kHz for mMTC) suitable for eMBB and mMTC through one NR carrier Or time-division scheduling units having different lengths, such as subframes or slots or mini-slots, within an NR carrier operating with any one numerology. -domain scheduling unit) must be supported at the same time.

As a way of doing this, semi-statically assigns time / frequency resources (or regions) in which resource allocation is made based on optimal scheduling units for each service usage scenario. In addition, resource allocation may be performed using time / frequency resources of a region corresponding to a usage scenario for each terminal.

However, if the domain of radio resources for each use scenario is divided by the quasi-static method, the efficiency in terms of the NR system may be somewhat reduced. For example, a time / frequency resource that always supports a short time-domain scheduling unit to satisfy that rarely occurring URLLC service in any NR cell where URLLC traffic is sparse. Dedicating a time / frequency resource may be undesirable.

Therefore, in order to solve this problem, a scheduling method for satisfying the URLLC latency requirement by using a part of a scheduling resource of eMBB or mMTC dynamically whenever a corresponding URLLC traffic occurs. It is required.

To this end, the NR punctures some OFDM symbols among resources allocated for a data channel of any eMBB or mMTC and uses dynamic puncturing-based eMBB / URLLC multiplexing for urgent URLLC data transmission and reception. multiplexing) can be considered. That is, a scheme of supporting preemption based scheduling in URLLC data transmission and reception may be considered.

Specifically, when multiplexing based on dynamic puncturing between eMBB / URLLC is applied, instructing the corresponding eMBB UE to inform the corresponding eMBB terminal of a resource puncturing for URLLC data transmission. As a method, a pre-notification method that indicates the information before puncturing and whether the puncturing is performed after the on-going transmission is finished ( Consideration may be given to post-notification methods.

In the present specification, when a technique of dynamically puncturing a radio resource is applied, various embodiments for reporting the punctured radio resource information are proposed.

The embodiments described below may 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 core network entities (AMFs). For convenience of description, the base station may refer to an eNB of LTE / E-UTRAN, and a base station (CU, DU, or CU and DU) may be represented in a 5G wireless network in which a central unit (CU) and a distributed unit (DU) are separated. An entity implemented as one logical entity), gNB.

On the other hand, in the NR usage scenario, URLLC refers to a service that supports high reliability and low latency, and refers to a service that is used when a serious problem occurs when a delay occurs in the data transmission / reception process although the size of data transmitted / received is not large. Can be. For example, the URLLC service may be used when a delay in data transmission and reception, such as an autonomous vehicle, may cause human / physical damage due to a traffic accident.

The eMBB uses a service that supports data transmission at a high speed and may mean a service used when a large amount of data needs to be transmitted and received. For example, if a large amount of data need to be transmitted per unit time such as 3D video or UHD service, the eMBB service may be used.

The mMTC may refer to a service used when the size of data transmitted and received is not large and delay does not matter, but low power consumption is needed. For example, sensor devices installed to build a smart city can use the mMTC service because it needs to operate for as long as possible with an onboard battery.

In a general case, one of the three services of URLLC / eMBB / mMTC described above may be serviced to the terminal according to the characteristics of the terminal. Hereinafter, if necessary, a terminal using URLLC service may be referred to as a URLLC terminal, a terminal using eMBB service, an eMBB terminal, and a terminal using mMTC service. And eMBB, mMTC, URLLC can also be interpreted as eMBB terminal, mMTC terminal, URLLC terminal, respectively.

In this embodiment, preemption means reassigning a part of resources allocated to eMMB or mMTC to URLLC in order to satisfy a latency requirement for URLLC when traffic for URLLC occurs. At this time, since the resources originally assigned to the eMBB or mMTC are used in URLLC, the eMBB terminal or the mMTC terminal to which the original resources have been allocated should receive information on which resources are preempted. Downlink preemption means that preemption of downlink resources of the UE occurs.

The downlink preemption indication information is information for indicating to the terminal which data channel (or radio resource) is preempted in the downlink, and the downlink preemption information is information indicating the downlink preemption to the terminal. It can also be expressed as The downlink preemption information can be indicated in the form of a signal or channel.

In addition, the eMBB terminal and the URLLC terminal in the present specification to apply the concepts currently discussed in the current 3GPP, the specific classification of this is as follows: whether or not to perform monitoring on the dynamic puncturing notification (dynamic puncturing notification) information as follows: It may be determined by the length of the inter scheduling unit.

For example, when dynamic puncturing is applied, a terminal requiring monitoring of notification information (or channel) for dynamic puncturing corresponds to an eMBB terminal, and the terminal does not need monitoring. May correspond to a URLLC terminal. In addition, the distinction between the eMBB terminal and the URLLC terminal may be determined by a subcarrier spacing (SCS) value set for the terminal and a time interval scheduling unit (eg, slot, aggregated slot, mini-slot, etc.) allocated for the terminal. For example, a terminal having a slot unit of a specific SCS value or a long time duration scheduling unit of an aggregate-slot unit is an eMBB terminal, and has a transmission neuron of a specific SCS value or a specific SCS value or less. The terminal having a short time duration scheduling unit of a mini-slot unit may be a URLLC terminal. Alternatively, a terminal defining a reference value (eg, X ms) value of a time interval scheduling unit (or interval) for distinguishing eMBB and URLLC and having a time interval scheduling unit larger than the corresponding threshold value may correspond to an eMBB terminal corresponding reference value ( The terminal having a time interval scheduling unit smaller than the threshold may be a URLLC terminal.

Referring to FIG. 2, the horizontal axis represents TTI for eMBB UEs (TTIs) for the eMMB terminal as time base resources, and the vertical axis represents NR carriers as frequency axis resources.

2 is a region in which a downlink control channel (PDCCH) is transmitted for an eMMB terminal, and the downlink control channel includes scheduling information about a downlink data channel (PDSCH) for the eMBB terminal.

And 2) shows an area in which the aforementioned downlink data channel is transmitted to the eMBB terminal.

And 3) indicates an area for transmitting a downlink control channel (PDCCH) or a downlink data channel (PDSCH) through a resource preempted by the URLLC terminal when downlink preemption occurs. In this case, the eMBB terminal needs to monitor information indicating that the resource is preempted by the URLLC terminal, that is, downlink preemption information, so that the eMBB terminal can recognize the downlink preemption and respond to it.

At this time, in the case of using the above-described pre-notification method, downlink preemption information is transmitted to the eMBB terminal before the preemption occurs in the area of 4).

On the other hand, in the case of using the post-notification method described above, downlink preemption information is transmitted to the eMBB terminal after the area of 5), that is, preemption occurs.

Referring to FIG. 3, the radio resources for eMBB and the radio resources for URLLC may be set to have different subcarrier spacing and symbol length. For example, the subcarrier spacing for URLLC may be set to three times the subcarrier spacing for eMBB, and the symbol length may be set to 1/3.

Therefore, when radio resources for eMBB and URLLC are multiplexed, it may be set as shown in FIG. 3.

Referring to FIG. 4, as another example, the subcarrier spacing and the symbol length for the eMBB and the URLLC may be set to be the same. Even in this case, as shown in FIG. 4, radio resources for eMBB and URLLC may be multiplexed.

Hereinafter, the operation of the terminal and the base station for notifying the terminal when the radio resources allocated for different services according to the present embodiment overlaps or allocates rarely generated radio resources to the radio resources allocated for other services This will be described with reference to the drawings.

Referring to FIG. 5, the terminal may perform receiving the configuration information for receiving the downlink preemption information from the base station (S510). For example, the terminal may receive configuration information for monitoring downlink preemption information. For example, the configuration information may be received through cell specific signaling or terminal specific signaling. For example, the configuration information may be received through terminal specific RRC signaling. As another example, the configuration information may be received through cell specific RRC signaling. As another example, the configuration information may be received through the terminal group common signaling.

The configuration information may include at least one of subcarrier spacing, duration information, frequency resource information, cell specific RNTI, and slot index. Through this, the terminal may identify resources for receiving downlink preemption information implicitly.

In addition, the terminal may perform the step of monitoring the downlink preemption indication information based on the configuration information (S520). For example, the terminal may identify radio resources for which the terminal should monitor using the setting information. For example, the terminal may monitor the downlink control channel. Specifically, the terminal may monitor the common search space or the group common search space of the downlink control channel. Alternatively, the terminal may monitor the terminal specific search space of the downlink control channel.

Meanwhile, the terminal may perform monitoring by a blind decoding method. As an example, the UE may perform monitoring by performing CRC scrambling of downlink control information including downlink preemption indication information using a cell specific RNTI. For example, the cell specific RNTI may be set through cell specific higher layer signaling or may be preset to an arbitrary value. As another example, the UE may perform monitoring by performing CRC scrambling of downlink control information including downlink preemption indication information using a C-RNTI or a newly defined RNTI. For example, the C-RNTI or the newly defined RNTI may be received through UE specific RRC signaling.

In addition, the UE may include receiving downlink preemption information through a multicast or unicast signal (S530). For example, the downlink preemption indication information may include information for indicating a radio resource overlapping a radio resource for providing a first service and a radio resource for providing a second service. As another example, the downlink preemption indication information may include information for indicating a radio resource set for a predetermined specific service (eg, URLLC).

For example, the downlink preemption indication information may be received through a common search space or a group common search space of a downlink control channel. That is, downlink preemption information may be received through cell specific signaling. As another example, the downlink preemption information may be received through a terminal specific search space of a downlink control channel. That is, downlink preemption information may be received through UE specific signaling.

The terminal may receive the downlink preemption indication information and recognize that the radio resource indicated by the downlink preemption indication information is a resource temporarily allocated for a specific service. For example, the terminal described above may be an eMBB terminal, and a terminal for which radio resources are indicated through downlink preemption indication information may be a URLLC terminal. That is, the first service may be eMBB, and the second service may be URLLC. Alternatively, the first service may be URLLC, and the second service may be eMBB. Likewise, the same applies when mMTC is applied instead of eMBB.

Referring to FIG. 6, the base station may perform step of configuring configuration information for monitoring downlink preemption information (S610). As described above, the configuration information may include information necessary for the terminal to monitor the downlink preemption information. For example, the configuration information may include at least one of subcarrier spacing, duration information, frequency resource information, cell specific RNTI, and slot index. Through this, the terminal may identify resources for receiving downlink preemption information implicitly.

The base station may perform the step of transmitting the configuration information to the terminal (S620). For example, the configuration information may be transmitted through cell specific signaling or terminal specific signaling. For example, the configuration information may be transmitted through UE specific RRC signaling. As another example, the configuration information may be transmitted through cell specific RRC signaling. As another example, configuration information may be transmitted through UE group common signaling.

The base station may perform the step of transmitting downlink preemption information through a multicast or unicast signal based on the configuration information (S630). For example, the downlink preemption indication information may include information for indicating a radio resource overlapping a radio resource for providing a first service and a radio resource for providing a second service. As another example, the downlink preemption indication information may include information for indicating a radio resource set for a predetermined specific service (eg, URLLC).

For example, the downlink preemption information may be transmitted through a common search space or a group common search space of a downlink control channel. That is, downlink preemption information may be transmitted through cell specific signaling. As another example, the downlink preemption information may be transmitted through a UE specific search space of a downlink control channel. That is, downlink preemption information may be transmitted through UE specific signaling. The terminal may receive the downlink preemption indication information and recognize that the radio resource indicated by the downlink preemption indication information is a resource temporarily allocated for a specific service.

As described above, the terminal receives downlink preemption information including information indicating radio resources for a specific service, and the base station can multiplex and provide various services by dynamically configuring radio resources.

Hereinafter, when transmitting and receiving the aforementioned downlink preemption indication information, a case of using cell-specific signaling and a case of using UE-specific signaling will be described in more detail. In addition, in each embodiment, the notification method and the following notification method are divided and described, and the operation of transmitting and receiving setting information will be described by dividing the embodiment. For convenience of description, in the following detailed embodiments, the eMBB terminal will be described based on an operation of receiving downlink preemption information on URLLC radio resources, but is not limited thereto.

First Embodiment: Indication Through Cell-Specific (or Slot-Specific) Signals

Any NR cell / base station is a resource or eMBB that punctures eMBB data for URLLC data transmission in any time-scheduling scheduling unit (eg, slot or aggregated-slot) defined for the eMBB terminal. And cell-specific transmission of notification information (downlink preemption indication information described above) for a resource where superposition of the URLLC downlink data is performed. Alternatively, the base station may transmit the downlink preemption indication information to the UE common or the UE group common.

Specifically, when the above-mentioned dynamic puncturing based on pre-notification or dynamic puncturing based on post-notification is applied, the corresponding slot (when applying pre-notification or post-notification) Or resource information used for URLLC data transmission in a previous slot (when post-notification is applied), that is, resource information (for example, downlink preemption indication information) in which data puncturing or URLLC data is overlapped from an eMBB terminal perspective The BS may broadcast or multicast through cell-specific or UE common / group-UE common signaling.

For example, when a pre-notification method is applied, the common L1 control signaling is performed in a common search space of a downlink control channel (NR PDCCH) in a next generation wireless access network of a corresponding slot. Resource allocation information for downlink (or uplink) URLLC data transmission in a slot, that is, resource information (puncturing or superposition) for eMBB data transmission transmitted through any corresponding slot (downlink preemption) Indication information) may be transmitted by the base station to the eMBB terminal in the cell. Alternatively, in defining a method for signaling dynamic puncturing (or overlapping) notification transmitted between on-going data transmissions through a corresponding slot, the corresponding dynamic puncturing signaling is configured to monitor a dynamic puncturing / superposition notification in a corresponding cell (or a corresponding slot). The downlink preemption information can be transmitted to all eMBB terminals). In this case, a search space or transmission resource for receiving the downlink preemption indication information is also commonly configured for all eMBB terminals in the cell (or configured to monitor the downlink preemption indication information in the corresponding slot). In more detail, a cell-specific or UE / group-UE common search space for receiving downlink preemption indication information or a period of a predetermined resource may include subcarrier spacing and slot duration. implicitly determined as a function of duration), or may be set via cell-specific RRC signaling, and may include frequency resource information (e.g., sub-band or a (set of) PRB ( s)) is determined as a function of a cell-specific RNTI or a slot index for receiving corresponding cell-specific downlink preemption information, or cell-specific RRC signaling. Can be determined by. Or it may be set in advance.

As another example, when a post-notification method is applied, resource allocation information for transmitting URLLC data in a previous slot through a common L1 control signaling of a common search space of an NR PDCCH of an arbitrary slot, that is, any corresponding Resource information (downlink preemption indication information), which is punctured or superimposed on the eMBB data transmission transmitted through the slot, may be transmitted to the eMBB terminal in the corresponding cell. Alternatively, if a post-notification method is defined after transmitting downlink preemption information in the slot to the last symbol (s) of the corresponding slot, the downlink preemption information in the cell (or in the corresponding slot) is defined. All of the eMBB terminals (set to monitor downlink preemption indication information) may be transmitted in common. In this case, like the previous pre-notification example described above, a search space or a transmission resource for receiving the downlink preemption indication information is also set in the cell (or configured to monitor the downlink preemption indication information in the corresponding slot). It may be configured in common for all eMBB terminals. In this case, as in the foregoing pre-notification method, a cell-specific or UE / terminal group common search space or preset frequency resource information (eg, sub- band or a (set of) PRB (s)) is determined as a function of cell-specific RNTI, slot index, etc. for receiving corresponding cell-specific downlink preemption information, or is determined by cell-specific RRC signaling, or is preset Can be.

Meanwhile, when a blind decoding based monitoring method is applied through an NR PDCCH or a separate L1 control channel to receive the corresponding downlink preemption information, the CRC of the downlink control information including the downlink preemption indication information is applied. The above-described cell specific RNTI for scrambling may be set through cell-specific higher layer signaling by the base station, or may be preset to an arbitrary value.

In addition, when a cell-specific (or terminal common, terminal group common) dynamic puncturing notification is made as described above, in the case of an eMBB terminal in which data channel resource allocation is performed in a corresponding slot, puncturing / overlapping resource through corresponding downlink preemption indication information Only when the allocation information and the data channel resource allocation information for the corresponding eMBB terminal partially overlap (partially overlap), puncturing or overlap for transmitting and receiving the corresponding eMBB data may be applied.

As described above, the downlink preemption indication information may be transmitted to a plurality of terminals or terminals included in a terminal group through cell-specific multicast schemes.

Second embodiment: Method for indicating UE-specific or slot-specific (or slot-specific) .

Any NR cell / base station is a resource for puncturing eMBB data for URLLC data transmission in any time-scheduling scheduling unit (eg, slot or aggregated-slot) defined for the eMBB terminal or eMBB and URLLC downlink. UE-specific transmission of the notification information (downlink preemption indication information) for the resource overlapping the link data can be made.

Specifically, when the above-mentioned dynamic puncturing based on pre-notification or dynamic puncturing based on post-notification is applied, the corresponding slot (pre-notification or post-notification) is applied. When the notification is applied) or when some of the resources allocated for the data transmission are used for the transmission of the URLLC for the eMBB terminals that have been allocated the downlink data resource in the previous slot (post-notification), this is applicable. Each of the eMBB terminals may be configured to be unicasted through UE-specific signaling.

For example, when a pre-notification method is applied, UE-specific downlink control information (UE-specific DCI) or downlink allocation in a UE-specific search space of a NR PDCCH of a corresponding slot. Resource allocation information used for transmitting URLLC data among allocated resources when transmitting downlink (or uplink) data transmission resource allocation information for a corresponding terminal in a corresponding slot through DL assignment DCI Information indicating downlinking or puncturing for resources allocated for the corresponding URLLC data transmission may be transmitted together with downlink preemption information. Alternatively, in defining a downlink preemption indication information signaling method transmitted between on-going data transmissions to an eMBB terminal in which downlink data transmission is performed, a corresponding search space for receiving UE specific downlink preemption indication information for each terminal is provided. Alternatively, the resource may be defined to transmit specific downlink preemption indication information based on the terminal. In this case, a search space or a period of resources for receiving downlink preemption indication information in a corresponding slot is implicitly determined as a function of subcarrier spacing and slot duration, or is defined through terminal definition or cell-specific RRC signaling. The frequency resource information (eg, sub-band or a (set of) PRB (s)) may include an ID (eg, C-RNTI), a slot index, and corresponding eMBB data transmission of the corresponding UE. It may be determined as a function of RB index (eg lowest RB or highest RB index), or may be determined by UE-specific / cell-specific RRC signaling.

As another example, when a post-notification method is applied, a received downlink received in a previous slot through UE-specific L1 control signaling of a UE-specific search space of an NR PDCCH of an arbitrary slot. Resource information used for transmitting URLLC downlink data among the link data resources and downlink control information indicating whether puncturing or overlapping of the resource allocated for transmission of the corresponding URLLC data may be transmitted. Alternatively, if a post-notification method is defined after signaling downlink preemption information in the corresponding slot through symbol (s) at the end of the corresponding slot in which downlink eMBB data is transmitted, downlink preemption indication for this is defined. The information signaling defines a search space or a resource for receiving UE-specific downlink preemption indication information for each UE as in the case of the above-described pre-notification, and based on this, the UE specifies the corresponding downlink preemption indication information. Can be sent. In this case, the search space or the frequency resource information (eg, sub-band or a (set of) PRB (s)) for receiving downlink preemption indication information in the corresponding slot is an ID (eg, C-RNTI), a slot index, a RB index (e.g., a lowest RB or a highest RB index) through which eMBB data transmission is performed, or a function such as a UE-specific / cell-specific RRC signaling.

Meanwhile, when the blind decoding based monitoring method through the NR PDCCH or a separate L1 control channel is applied to receive the downlink preemptive indication information, the RNTI for CRC scrambling of DCI for the downlink indication information is applied. The base station may reuse the C-RNTI of the terminal or set a separate terminal specific RNTI for this to be transmitted to each terminal through UE-specific RRC signaling.

As described above, the base station may transmit downlink preemption indication information through terminal specific signaling. In addition, the terminal may receive configuration information (eg, the above-described RNTI) for monitoring downlink preemption information through terminal-specific or cell-specific signaling.

Hereinafter, the configuration of a terminal and a base station in which all or part of the embodiments described above can be performed will be described with reference to the drawings.

Referring to FIG. 7, the terminal 700 includes a receiver 730 for receiving configuration information for receiving downlink preemption information from a base station and a controller 710 for monitoring downlink preemption information based on the configuration information. It may include.

In addition, the receiving unit 730 receives the downlink preemption information through a multicast or unicast signal, and the downlink preemption information includes radio resources for providing a first service and radio resources for providing a second service. It may include information for indicating the overlapping radio resources. In addition, at least one of a subcarrier spacing and a time period scheduling unit may be differently set for the radio resource for providing the first service and the radio resource for providing the second service. Alternatively, the radio resources for providing the first service and the radio resources for providing the second service may have the same subcarrier spacing and time duration scheduling unit.

Meanwhile, configuration information may be received through UE-specific RRC signaling, and downlink preemption information may be received through a common search space or a group common search space of a downlink control channel or a downlink control channel. It may be received through the terminal specific search space of the.

In addition, the receiver 730 receives downlink control information, data, and a message from a base station through a corresponding channel.

In addition, the controller 710 dynamically receives the downlink preemption instruction information according to the present invention and controls the overall operation of the user terminal 700 according to the use of multiplexing radio resources.

The transmitter 720 transmits uplink control information, data, and a message to a base station through a corresponding channel.

Referring to FIG. 8, the base station 800 transmits the control unit 810 constituting the setting information for monitoring the downlink preemption indication information and the setting information to the terminal, and multiplies the downlink preemption indication information based on the setting information. The transmitter 820 may be transmitted through a cast or unicast signal. The downlink preemption indication information may include information for indicating a radio resource overlapping a radio resource for providing a first service and a radio resource for providing a second service. In addition, at least one of a subcarrier spacing and a time period scheduling unit may be differently set for the radio resource for providing the first service and the radio resource for providing the second service. Alternatively, the radio resources for providing the first service and the radio resources for providing the second service may have the same subcarrier spacing and time duration scheduling unit.

On the other hand, configuration information may be transmitted through UE-specific RRC signaling, and downlink preemption information is transmitted through a common search space or a group common search space of a downlink control channel or a downlink control channel. It may be transmitted through the terminal specific search space.

In addition, the controller 810 dynamically configures and transmits downlink preemption information according to the present invention, thereby controlling the overall operation of the base station 800 according to multiplexing and using radio resources.

In addition, the transmitter 820 and the receiver 830 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiments.

The standard contents or standard documents mentioned in the above embodiments are omitted to simplify the description of the specification and form a part of the present specification. Therefore, the addition of the contents of the standard and part of the standard documents to the specification or the description in the claims should be construed as falling within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with the Korean Patent Application No. 10-2016-0152659 filed in Korea on November 16, 2016 and the patent application No. 10-2017-0151983 filed in Korea on November 15, 2017. Priority is claimed under section (a) (35 USC § 119 (a)), all of which is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

In a method for receiving a downlink signal by the terminal,

Receiving configuration information for receiving downlink preemption information from a base station;

Monitoring the downlink preemption indication information based on the configuration information; And

Receiving the downlink preemption information through a multicast or unicast signal,

The downlink preemption information,

And information for indicating an overlapping radio resource of a radio resource for providing a first service and a radio resource for providing a second service.
The method of claim 1,

Radio resources for providing the first service and radio resources for providing the second service,

At least one of the subcarrier spacing and the time period scheduling unit are set differently.
The method of claim 1,

The setting information,

Characterized in that it is received via UE-specific RRC signaling.
The method of claim 1,

The downlink preemption information,

And received through a common search space or a group common search space of a downlink control channel.
The method of claim 1,

The downlink preemption information,

And receiving through a UE specific search space of a downlink control channel.
In the base station transmits a downlink signal,

Configuring setting information for monitoring downlink preemption information;

Transmitting the setting information to a terminal; And

And transmitting the downlink preemption information through a multicast or unicast signal based on the configuration information.

The downlink preemption information,

And information for indicating an overlapping radio resource of a radio resource for providing a first service and a radio resource for providing a second service.
The method of claim 6,

Radio resources for providing the first service and radio resources for providing the second service,

At least one of the subcarrier spacing and the time period scheduling unit are set differently.
The method of claim 6,

The setting information,

Characterized in that it is transmitted via UE-specific RRC signaling.
The method of claim 6,

The downlink preemption information,

The method is characterized by being transmitted through a common search space or a group common search space of the downlink control channel.
The method of claim 6,

The downlink preemption information,

The method characterized in that the transmission through the terminal specific search space of the downlink control channel.
In a terminal for receiving a downlink signal,

A receiving unit which receives setting information for receiving downlink preemption information from a base station; And

And a controller for monitoring the downlink preemption indication information based on the setting information.

The receiving unit,

Receiving the downlink preemption information through a multicast or unicast signal,

The downlink preemption information,

A terminal comprising information for indicating a radio resource overlapping a radio resource for providing a first service and a radio resource for providing a second service.
The method of claim 11,

Radio resources for providing the first service and radio resources for providing the second service,

And at least one of a subcarrier spacing and a time period scheduling unit is differently set.
The method of claim 11,

The setting information,

UE, characterized in that received via UE-specific RRC signaling.
The method of claim 11,

The downlink preemption information,

And a terminal is received through a common search space or a group common search space of a downlink control channel.
The method of claim 11,

The downlink preemption information,

And a terminal received through a terminal specific search space of a downlink control channel.
In the base station for transmitting a downlink signal,

A controller configured to configure setting information for monitoring downlink preemption information; And

A transmission unit for transmitting the configuration information to a terminal and transmitting the downlink preemption information through a multicast or unicast signal based on the configuration information,

The downlink preemption information,

A base station comprising information for indicating a radio resource overlapping a radio resource for providing a first service and a radio resource for providing a second service.
The method of claim 16,

Radio resources for providing the first service and radio resources for providing the second service,

And at least one of a subcarrier spacing and a time period scheduling unit is differently set.
The method of claim 16,

The setting information,

A base station characterized in that it is transmitted via UE-specific RRC signaling.
The method of claim 16,

The downlink preemption information,

A base station characterized in that it is transmitted through a common search space or a group common search space of the downlink control channel.
The method of claim 16,

The downlink preemption information,

A base station characterized in that the transmission through the terminal specific search space of the downlink control channel.