WO2018080274A1

WO2018080274A1 - Method and device for transceiving data channel in next-generation wireless network

Info

Publication number: WO2018080274A1
Application number: PCT/KR2017/012118
Authority: WO
Inventors: 박규진; 최우진
Original assignee: 주식회사 케이티
Priority date: 2016-10-31
Filing date: 2017-10-31
Publication date: 2018-05-03

Abstract

The present embodiments relate to a method and device for transceiving a data channel in the next-generation/5G wireless access network, and one of the embodiments provides a method for a terminal to transceive a data channel, the method comprising: a step of receiving a first DCI from a base station through a downlink control channel; a step of receiving a second DCI from the base station through the downlink control channel; a step of determining, based on the first DCI and the second DCI, if a scheduling override condition is met; and a step of configuring to transceive a data channel on the basis of the second DCI if it is determined that the scheduling override condition is met.

Description

Method and apparatus for transmitting and receiving data channel in next generation wireless network

The present embodiments are directed to a method of transmitting and receiving data channels in a next generation / 5G wireless access network (hereinafter also referred to as "NR"), which has been discussed in 3GPP.

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.

In particular, there is a need for efficient scheduling of data channels for URLLC that are latency critical in NR. For example, if there is a scheduling request for uplink / downlink data for a URLLC that is latency critical in a time interval in which resources are allocated for eMMB data transmission and reception, data transmission / reception resources for the corresponding URLLC are preferentially allocated. Needs to be.

An object of the present embodiments is to provide a specific scheme for efficient data channel transmission and reception for URLLC which is latency critical in NR.

According to an embodiment of the present invention, a method for transmitting and receiving a data channel by a terminal includes receiving a first DCI through a downlink control channel from a base station, and a second through a downlink control channel from a base station. Receiving a DCI, determining whether a scheduling override condition is satisfied based on the first DCI and the second DCI, and setting to transmit and receive a data channel based on the second DCI when determining that the scheduling override condition is satisfied. It provides a method comprising a.

In addition, according to an embodiment of the present invention, a method of transmitting information for scheduling a data channel by a base station includes: transmitting a first DCI to a terminal through a downlink control channel; configuring a second DCI for indicating a scheduling override And transmitting a second DCI to the terminal through a downlink control channel.

In addition, an embodiment of the present invention provides a terminal that transmits and receives a data channel, and includes a receiver for receiving a first DCI and a second DCI from a base station through a downlink control channel, and a scheduling override condition based on the first DCI and the second DCI. And a controller configured to transmit / receive a data channel based on the second DCI when it is determined that the scheduling override condition is satisfied.

In addition, an embodiment of the present invention provides a base station for transmitting information for scheduling a data channel, comprising: a transmitter for transmitting a first DCI and a second DCI to a terminal through a downlink control channel, and a second DCI for indicating a scheduling override; It provides a base station comprising a control unit for configuring.

According to the present embodiments, it is possible to provide a specific scheme for efficient data channel transmission and reception for URLLC which is latency critical in NR.

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

2 is a diagram illustrating a process of scheduling override according to the present embodiments.

3 is a diagram illustrating a procedure of a terminal transmitting and receiving a data channel in this embodiment.

4 is a diagram illustrating a procedure for transmitting information for scheduling a data channel by the base station in the present embodiment.

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

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 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 supports UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or lower 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 in New Radio (NR), which is recently discussed by 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 downlink portion (DL portion) + (gap) + uplink portion (UL portion).

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

In particular, in the case of transmitting / receiving delay critical data such as URLLC, a slot 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 SCS or different TTI lengths.

NR에서At NR 제어 정보와 데이터 간 타이밍 관계(timing relationship between control and data for NR) Timing relationship between control and data for NR

In NR, a method of determining HARQ ACK / NACK feedback timing according to downlink data reception of a UE is dynamically set by L1 signaling (eg DCI) or semi-statically by an upper layer. Consideration is given to methods that are configured, or a combination of higher layers and dynamic L1 signaling.

In addition, as a method for determining the timing between UL assignment and thus UL data transmission, it is also dynamically set by L1 signaling (eg DCI) or semi-statically by a higher layer. Consideration has been given to methods that can be configured or configured with a combination of higher layers and dynamic L1 signaling.

Although no further discussion has been made, DL assignment and thus DL data reception timing are also dynamically set by the base station by L1 signaling (eg DCI) or by an upper layer. Methods may be considered that are statically set or a combination of a higher layer and dynamic L1 signaling.

The following is the subject of discussion.

o Timing relationship between DL data reception and corresponding acknowledgment can be (one or more of, FFS which ones)

Dynamically indicated by L1 signaling (e.g., DCI)

Semi-statically indicated to a UE via higher layer

A combination of indication by higher layers and dynamic L1 signaling (e.g., DCI)

o Further study: minimum interval between DL data reception and corresponding acknowledgment (FFS)

o Further research: common channels (e.g. random access) (FFS)

o Timing relationship between UL assignment and corresponding UL data transmission can be (one or more of, FFS which ones)

Dynamically indicated by L1 signaling (e.g., DCI)

Semi-statically indicated to a UE via higher layer

o minimum interval between UL assignment and corresponding UL data transmission (FFS)

o Further research: common channels (e.g. random access) (FFS)

This embodiment proposes an efficient scheduling method for a URLLC related data channel that is latency critical in NR.

As described above, in NR, an arbitrary timing gap may be set between UL assignment DCI or DL assignment DCI and UL data transmission or DL data reception of a terminal corresponding thereto. . In this case, the timing gap may be set differently according to the capability of the terminal and the latency requirement of the data, and a transmission time interval (TTI) configured for the terminal. Can vary by length.

For example, in the case of a terminal equipped with good processing capability, or a terminal in which latency-critical URLLC-related data scheduling is performed, a corresponding timing gap may be configured to be short. Depending on the subcarrier spacing (SCS) value configured for the terminal and whether slot / mini-slot / slot-aggregation is set as TTI, the time difference between actual DCI and data transmission and reception is Can vary.

For example, 15 kHz is set as an uplink / downlink transmit / receive subcarrier spacing (SCS) value for a certain terminal A in a certain NR cell, a slot composed of 14 symbols is set as a TTI for the corresponding terminal, and a corresponding cell is set. When 60 kHz is set as an uplink / downlink transmit / receive subcarrier spacing (SCS) value for another terminal B in the slot, and a slot consisting of 7 symbols is set as the TTI for the terminal, the TTI length of the terminal A and the terminal B, respectively. The difference is 1ms and 0.125ms. At this time, the DCI, which can be configured by a combination of L1 signaling (L1 signaling) or higher layer signaling (L1 signaling) or L1 signaling (L1 signaling) and higher layer signaling, such as DCI, in the corresponding NR base station or network. The timing gap setting between the corresponding data and the corresponding data (or the timing gap setting between receiving DL data and corresponding HARQ ACK / NACK feedback) is set for each UE. It can be defined to be set in the base station by the unit, and interpreted in the terminal. That is, even when the timing gap setting value of the terminal A and the terminal B is equal to 4, the terminal A is interpreted as timing gap_A = 4 * TTI_A (1 ms) = 4 ms, respectively. In this case, timing gap_B = 4 * TTI_B (0.125ms) = 0.5ms can be defined to be interpreted.

As described above, when various timing gaps can be set according to TTI setting values or UE processing power and latency requirements for each UE in the same cell, latency requirements The data having weak requirements may be set to have a long timing gap based on a long TTI, and the timing critical data may be set to have a short timing gap based on a short TTI.

As such, in a situation in which different timing gaps can be set for each terminal or according to a latency requirement of data, any subframe / at any scheduling instant in any NR base station or network. When all frequency resources of a slot / mini-slot are allocated to transmit / receive large-capacity eMBB data for a small number of terminals, any time interval corresponding to a timing gap between the corresponding scheduling DCI and the corresponding eMBB data transmission / reception is random. When a scheduling request for delay critical UL (or DL) data arrives, it is necessary to first allocate data transmission / reception resources for the corresponding URLLC.

To this end, in the present embodiment, the scheduling information by UL assignment or DL assignment DCI already transmitted for an arbitrary terminal is overridden, and a new scheduling decision of a base station or a network ( In accordance with the decision, a new UL assignment DCI or DL assignment DCI is transmitted again, and a scheduling override scheme for transmitting or receiving UL or DL data by the corresponding UE based on the new scheduling control information may be proposed. do.

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.

The scheduling override described in this embodiment means scheduling data transmission / reception based on a new DCI, that is, a DCI received after the existing DCI, instead of the existing DCI, that is, the DCI that is the basis of the current data transmission / reception.

In addition, the override indication information described in this embodiment may also be expressed as an override indicator, and means information instructing the terminal to override scheduling with a new DCI. Such override indication information may be indicated in various forms.

For example, the override indication information may be indicated in a separate DCI format, and the terminal may recognize that the DCI is indicative of scheduling override when the DCI is configured in a specific scheduling override DCI format. As another example, the override indication information may be a separate field included in the DCI, and the UE sees the scheduling override indication field included in the DCI and recognizes that the scheduling override is indicated if the value is true, and does not indicate the scheduling override if false. It can be recognized as.

As another example, the corresponding override indication information may not include new scheduling information. In this case, the override indication information may include existing scheduling control information, that is, uplink assignment (UL assignment) DCI or downlink assignment (DL assignment). It may be defined to be interpreted by the terminal as meaning of stopping or canceling transmission / reception of PDSCH or PUSCH according to DCI.

As another example, the corresponding override indication information may be indicated from the base station during the transmission of the uplink data channel (PUSCH) of the terminal. In this case, the corresponding terminal may be defined to stop transmitting the uplink data.

Referring to FIG. 3, the terminal may receive a first DCI from the base station through a downlink control channel (S300). The first DCI may include allocation information for the uplink data resource or the downlink data resource of the terminal, and the terminal may schedule the data channel based on the first DCI.

In addition, the terminal may receive a second DCI from the base station through the downlink control channel (S310). The second DCI may also include allocation information on the uplink data resource or the downlink data resource of the terminal.

When the terminal receives the first DCI and the second DCI, the terminal may determine whether the scheduling override condition is satisfied based on the first DCI and the second DCI (S320).

For example, the terminal determines that the scheduling override condition is satisfied when the HARQ process number or ID of the first DCI is the same as the HARQ process number or ID of the second DCI. When the HARQ process number or ID of the first DCI and the HARQ process number or ID of the second DCI are different, it may be determined that the scheduling override condition is not satisfied. In this case, since the second DCI does not include explicit indication information regarding the scheduling override, and the scheduling override is determined by comparing with the first DCI, this corresponds to a case where the scheduling override is implicitly indicated.

As another example, the UE may determine that the scheduling override condition is satisfied when the override indication information is included in the second DCI. The override indication information may be indicated in various ways. For example, the override indication information may be indicated in a scheduling override DCI format, which is a separate DCI format. As another example, the override indication information may be included in an uplink assignment (UL assignment) or a downlink assignment (DL assignment) DCI. It may be indicated by a separate field, that is, an information area. As another example, as described above, the corresponding override indication information may not include new scheduling information or may be indicated by a base station during transmission of an uplink data channel (PUSCH) of a terminal.

As another example, the UE may determine that the scheduling override condition is satisfied even when new resource allocation information is not included in the second DCI. At this time, the terminal may stop or cancel transmission and reception of the data channel based on the first DCI.

If the terminal determines that the scheduling override condition is satisfied (S320-YES), the terminal does not perform data channel transmission / reception based on the first DCI, and sets the transmission / reception of the data channel based on the second DCI ( S330). In this case, the UE is allocated a new data channel resource according to the second DCI.

However, when the UE determines that the UE does not satisfy the scheduling override condition (S320-NO), the UE does not perform the scheduling override based on the second DCI and continues to transmit and receive the data channel based on the first DCI. (S340). In other words, it is possible to continue using the previously allocated data channel resources.

Referring to FIG. 4, the base station transmits a first DCI to the terminal through a downlink control channel (S400). The first DCI may include information regarding data channel resource allocation for the UE to schedule the data channel. Upon receiving the first DCI, the terminal schedules a data channel based on the first DCI.

Thereafter, the base station configures a second DCI for indicating a scheduling override for scheduling override for the terminal according to a new scheduling decision (S410). The method of instructing the base station of the scheduling override may be performed implicitly or explicitly.

For example, the base station may set the number of HARQ processes of the second DCI such that the HARQ process number or ID of the first DCI is the same as the HARQ process number or ID of the second DCI. At this time, when the terminal receives the above-described second DCI, it is determined that the base station implicitly instructed the scheduling override, and can perform a new scheduling for the data channel based on the second DCI.

As another example, the base station may explicitly instruct the scheduling override to the terminal by including the override indication information in the second DCI. The override indication information may be indicated in various ways. For example, the override indication information may be indicated in a scheduling override DCI format, which is a separate DCI format, and in another example, may be indicated by a separate field included in the DCI, that is, an information area. When the terminal confirms the override indication information included in the second DCI, it is determined that the base station explicitly indicates the scheduling override, and according to the new scheduling information based on the second DCI, transmission or downlink data for the uplink data channel. The reception on the channel can be performed.

As another example, the base station may include information instructing the second DCI to stop or cancel transmission / reception of the data channel based on the first DCI.

Thereafter, the base station may transmit the above-described second DCI to the terminal (S420). As described above, when the UE receives the second DCI from the base station, the terminal may determine whether the scheduling override condition is satisfied, and if the condition is satisfied, the scheduling override may be performed.

Hereinafter, various embodiments of the method for scheduling the data channel by the aforementioned terminal and the base station will be described in detail.

The present embodiment described below may be applied to all cases in which data resources for a terminal need to be newly scheduled while data resources for the terminal are already scheduled through the DCI. The embodiments described below can be applied individually or in any combination.

실시예 1. 묵시적 오버라이드 지시(Implicit override indication)Example 1.Implicit override indication

As shown in FIG. 2, an uplink allocation or DL assignment DCI for an arbitrary terminal is transmitted in a base station or a network through a downlink control channel of any TTI #N configured for the corresponding terminal. A corresponding UL assignment or DL assignment DCI may indicate a timing gap of k TTIs. In this case, through the TTI of the time period corresponding to the corresponding timing gap, the base station or the network assigns HARQ allocated through UL assignment or DL assignment DCI of the corresponding TTI #N. The UL assignment or DL assignment information set to the same HARQ process number or ID as the HARQ process number or ID may be transmitted back to the corresponding UE. In this case, the UE may define so as to override scheduling information through a corresponding UL assignment or DL assignment DCI of TTI #N.

That is, in relation to scheduling of uplink data, an uplink assignment DCI in which a timing gap is indicated by k and a HARQ process number or ID is set to M in TTI #N is set. Assume the received terminal. In this case, the UE indicates new frequency / time resource allocation information set to HARQ process number or M having the same ID through a downlink control channel until uplink data transmission after a k timing gap. Receiving UL assignment DCI, do not perform UL data transmission according to the existing UL assignment DCI, but instead perform UL data transmission based on a new UL assignment DCI. can do.

Similarly, for the downlink, in the case of a terminal receiving a DL assignment DCI in which a timing gap is indicated by k in TTI #N and a HARQ process number or ID is set to M, Downlink allocation indicating new frequency / time resource allocation information set to HARQ process number or M having the same ID through a downlink control channel until downlink data received after a corresponding timing gap ( When DL assignment) DCI is received, it is defined not to perform DL data reception according to the existing DL assignment DCI, but instead to perform DL data reception based on a new DL assignment DCI. Can be.

However, as described above, a first HARQ process number or ID assigned to the same first DCI (first UL assignment DCI or first DL assignment DCI) is assigned. A UL assignment DCI or a second DL assignment DCI may not include new resource allocation information. In this case, the UE may interpret that PDSCH or PUSCH transmission or reception according to PDSCH or PUSCH scheduling information according to the first DCI is stopped or cancelled. That is, the base station may instruct the terminal to transmit new scheduling information overriding scheduling information of the first DCI through the second DCI, or to stop or cancel the scheduling of the PDSCH or the PUSCH by the first DCI. In particular, in the case of the PUSCH, the base station may indicate the stop of the PUSCH transmission through the second DCI during the PUSCH transmission of the UE, in this case, the UE may be defined to stop the transmission of the PUSCH immediately after receiving the second DCI.

실시예 2. 명시적 오버라이드 지시(Explicit override indication)Example 2. Explicit override indication

In the DCI, an information area for an override indication of an existing DCI may be defined, and thus, an override of any DCI may be performed.

In detail, as shown in FIG. 2, a UL assignment or DL assignment DCI for an arbitrary terminal in a base station or a network is transmitted through a downlink control channel of any TTI #N configured for the corresponding terminal. Suppose that a UL UL or DL assignment DCI indicates a timing gap of k TTI. At this time, the base station or the network transmits a DCI including an override indicator to the corresponding terminal through a TTI of a time period corresponding to a corresponding timing gap, and UL assignment of the corresponding TTI #N (UL assignment). Or DL assignment may be defined to override UL data or DL data transmission and reception according to DCI.

For this purpose, apart from UL assignment or DL assignment DCI format, DL / UL scheduling override DCI format including an explicit override indicator (DL / UL scheduling override DCI format) ) Can be defined.

In this case, the corresponding DL / UL scheduling override DCI format includes a HARQ process number or ID to be overridden together with a corresponding override indication information area. An information area indicating a timing gap until transmitting / receiving a pre-allocated UL or DL data transmission / reception in which an indicating information area or an override is made (that is, when a corresponding override DCI is transmitted in FIG. 2 and correspondingly, (information area indicating a timing gap with UL data transmission or DL data reception time) that is overridden).

Or by defining a corresponding override indication information region in an existing UL assignment DCI and DL assignment DCI format, thereby assigning an UL assignment DCI or downlink assignment already allocated. (DL assignment) may indicate whether or not to override the DCI.

In this case, when the corresponding override indication information area is set to true, the corresponding DCI is an UL assignment or downlink assignment (DL) having the same HARQ process number or ID as previously assigned. assignment) Overrides scheduling control information of the DCI and transmits uplink data according to new UL resource allocation information or DL resource allocation information included in the DCI in which the corresponding override indication is made, similarly to the first embodiment. Or to receive downlink data.

In addition, as described above, the second DCI including an override indicator for the existing first DCI (UL assignment DCI or first DL assignment DCI) is new. The resource allocation information may not be included. In this case, PDSCH or PUSCH transmission / reception according to PDSCH or PUSCH scheduling information according to the first DCI may be defined to be interpreted by the terminal as being suspended or cancelled. That is, the base station may transmit new scheduling information for overriding scheduling information of the first DCI through the second DCI, or simply instruct the terminal to stop or cancel PDSCH or PUSCH scheduling by the first DCI. In particular, in the case of the PUSCH, the base station may indicate the stop of the PUSCH transmission through the second DCI during the PUSCH transmission of the UE, in this case, the UE may be defined to stop the transmission of the PUSCH immediately after receiving the second DCI.

5 is a diagram illustrating a configuration of a base station 500 according to another embodiment.

Referring to FIG. 5, the base station 500 according to another embodiment includes a controller 510, a transmitter 520, and a receiver 530.

The controller 510 may configure a second DCI for indicating a scheduling override. The method of instructing the base station of the scheduling override through the second DCI may be performed implicitly or explicitly.

For example, the base station may set the HARQ process number or ID of the second DCI such that the HARQ process number or ID of the first DCI is the same as the HARQ process number or ID of the second DCI. . At this time, when the terminal receives the above-described second DCI, it is determined that the base station implicitly instructed the scheduling override, and can perform a new scheduling for the data channel based on the second DCI.

As another example, the base station may explicitly instruct the scheduling override to the terminal by including the override indication information in the second DCI. The override indication information may be indicated in various ways. For example, the override indication information may be indicated in a scheduling override DCI format, which is a separate DCI format, and in another example, may be indicated by a separate field included in the DCI, that is, an information area. When the terminal confirms the override indication information included in the second DCI, it may be determined that the base station explicitly indicates the scheduling override, and may newly schedule the data channel based on the second DCI.

The transmitter 520 and the receiver 530 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

The transmitter 520 may transmit the first DCI and the second DCI to the terminal through the downlink control channel. The base station may first transmit the first DCI to the terminal and then instruct the scheduling override to the terminal through the second DCI.

6 is a diagram illustrating a configuration of a user terminal 600 according to another embodiment.

Referring to FIG. 6, the user terminal 600 according to another embodiment includes a receiver 610, a controller 620, and a transmitter 630.

The receiver 610 receives downlink control information, data, and a message from a base station through a corresponding channel. In detail, the receiver 610 may receive the first DCI and the second DCI through the downlink control channel to the base station.

The controller 620 receives the first DCI from the receiver 610 and then determines whether the scheduling override condition is satisfied based on the first DCI and the second DCI when the second DCI is received, and satisfies the scheduling override condition. If it is determined that the data channel is determined, the data channel may be scheduled based on the second DCI.

For example, the terminal determines that the scheduling override condition is satisfied when the HARQ process number or ID of the first DCI and the HARQ process number or ID of the second DCI are the same, If the HARQ process number or ID of the DCI and the HARQ process number or ID of the second DCI are different, it may be determined that the scheduling override condition is not satisfied. In this case, since the second DCI does not include explicit indication information regarding the scheduling override, and the scheduling override is determined by comparing with the first DCI, this corresponds to a case where the scheduling override is implicitly indicated.

As another example, the UE may determine that the scheduling override condition is satisfied when the override indication information is included in the second DCI. The override indication information may be indicated in various ways. For example, the override indication information may be indicated in a scheduling override DCI format, which is a separate DCI format, and in another example, may be indicated by a separate field included in the DCI, that is, an information area.

The transmitter 630 transmits uplink control information, data, and a message to a base station through a corresponding channel.

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 APPLICATIONCROSS-REFERENCE TO RELATED APPLICATION

This patent application is related to the patent application No. 10-2016-0143751 filed in Korea on October 31, 2016 and the patent application No. 10-2017-0142190 filed in Korea on October 30, 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 the method for the terminal to transmit and receive data channels,

Receiving a first DCI over a downlink control channel from a base station;

Receiving a second DCI over a downlink control channel from a base station;

Determining whether a scheduling override condition is satisfied based on the first DCI and the second DCI; And

And setting a data channel to be transmitted / received based on the second DCI when it is determined that the scheduling override condition is satisfied.
The method of claim 1,

And if the HARQ process number or ID of the first DCI and the HARQ process number or ID of the second DCI are the same, determining that the scheduling override condition is satisfied.
The method of claim 1,

And when the override indication information is included in the second DCI, determining that the scheduling override condition is satisfied.
The method of claim 3, wherein

Stop or cancel transmission and reception of a data channel based on the first DCI.
The method of claim 3, wherein

The override instruction information,

Characterized in that it is indicated in a separate DCI format.
The method of claim 3, wherein

The override instruction information,

Method indicated by a separate field included in the DCI.
A method for transmitting information for scheduling a data channel by a base station, the method comprising:

Transmitting a first DCI to a terminal through a downlink control channel;

Configuring a second DCI for indicating a scheduling override; And

Transmitting the second DCI to a terminal through a downlink control channel.
The method of claim 7, wherein

The HARQ process number or ID of the first DCI and the HARQ process number or ID of the second DCI are the same.
The method of claim 7, wherein

The second DCI,

Including override indication information.
The method of claim 9,

The second DCI,

And information indicating to stop or cancel transmission and reception of a data channel based on the first DCI.
The method of claim 9,

The override instruction information,

Characterized in that it is indicated in a separate DCI format.
The method of claim 9,

The override instruction information,

UL assignment or DL assignment A method characterized in that indicated by a separate field included in the DCI.
In the terminal for transmitting and receiving data channel,

A receiver for receiving a first DCI and a second DCI from a base station through a downlink control channel;

And a controller configured to determine whether a scheduling override condition is satisfied based on the first DCI and the second DCI, and to transmit and receive a data channel based on the second DCI when it is determined that the scheduling override condition is satisfied. Terminal characterized in that.
The method of claim 13,

And if the HARQ process number or ID of the first DCI and the HARQ process number or ID of the second DCI are the same, determining that the scheduling override condition is satisfied.
The method of claim 13,

And when the override indication information is included in the second DCI, determining that the scheduling override condition is satisfied.
The method of claim 15,

And a terminal for stopping or canceling transmission and reception of a data channel based on the first DCI.
The method of claim 15,

The override instruction information,

Terminal characterized in that it is indicated in a separate DCI format.
The method of claim 15,

The override instruction information,

UL assignment or DL assignment A terminal characterized in that indicated by a separate field included in the DCI.
A base station transmitting information for scheduling a data channel,

A transmitter for transmitting a first DCI and a second DCI to a terminal through a downlink control channel; And

And a control unit configuring a second DCI for indicating a scheduling override.
The method of claim 19,

And a HARQ process number or ID of the first DCI and an HARQ process number or ID of the second DCI are the same.