KR20200100522A - Methods for transmitting an Uplink data for improving data transmission delay time in a next generation wireless network for And Apparatuses thereof - Google Patents

Abstract

The present disclosure proposes an uplink data channel resource allocation method for efficient multiplexing for ultra reliable and low latency communications (URLLC) and an enhanced mobile broadband (eMBB) service in a next-generation/5G radio access network (hereinafter referred to as new radio (NR)). According to the present invention, a method of a terminal for transmitting uplink data comprises the steps of: receiving preemption indication information from a base station; and determining at least one among transmission state and delay transmission state of uplink transmission data, and cancel or resume state of allocated resources based on the preemption indication information.

Description

TECHNICAL FIELD [Methods for transmitting an Uplink data for improving data transmission delay time in a next generation wireless network for And Apparatuses thereof]

The present disclosure is an uplink for efficient multiplexing for Ultra Reliable and Low Latency Communications (URLLC) and enhanced Mobile BroadBand (eMBB) services in a next-generation/5G radio access network (hereinafter referred to as NR [New Radio] in the present invention). We propose a link data channel resource allocation method.

An embodiment is a method for transmitting uplink data by a terminal, the method comprising: receiving preemption indication information from a base station; And determining at least one of whether to transmit commercial uplink transmission data, whether to delay transmission, or whether to cancel or resume allocated resources based on the preemption indication information.

1 is a diagram schematically illustrating a structure of an NR wireless communication system to which the present embodiment can be applied.
2 is a diagram for explaining a frame structure in an NR system to which this embodiment can be applied.
3 is a diagram illustrating a resource grid supported by a radio access technology to which the present embodiment can be applied.
4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.
5 is a diagram illustrating a synchronization signal block in a wireless access technology to which the present embodiment can be applied.
6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.
7 is a diagram for explaining CORESET.
8 is a diagram for explaining Example of symbol level alignment among different SCS.
9 is a diagram for explaining a conceptual example of a bandwidth part.
10 is a diagram for describing an embodiment of UL preemption.
11 is a diagram for describing another embodiment of UL preemption.
12 is a diagram showing a configuration of a base station according to another embodiment.
13 is a diagram showing a configuration of a user terminal according to another embodiment.

Hereinafter, some embodiments of the present technical idea will be described in detail with reference to exemplary drawings. In adding reference numerals to elements of each drawing, the same elements may have the same numerals as possible even if they are indicated on different drawings. In addition, in describing the technical idea, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the technical idea, the detailed description may be omitted.

In addition, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present embodiments. These terms are only for distinguishing the component from other components, and the nature, order, order, or number of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected or connected to that other component, but other components between each component It is to be understood that is "interposed", or that each component may be "connected", "coupled" or "connected" through other components.

In addition, terms and technical names used in the present specification are for describing specific embodiments, and the technical idea is not limited thereto. The terms described below may be interpreted as meanings generally understood by those of ordinary skill in the technical field to which the present technical idea belongs unless otherwise defined. When the corresponding term is an incorrect technical term that does not accurately express the present technical idea, it will be replaced with a technical term that can be correctly understood by those skilled in the art to be understood. In addition, general terms used in the present specification should be interpreted as defined in the dictionary or according to the context before and after, and should not be interpreted as an excessively reduced meaning.

The wireless communication system in the present specification refers to a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station, and a core network.

The embodiments disclosed below can be applied to a wireless communication system using various wireless access technologies. For example, the present embodiments are CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (timedivision multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (singlecarrier frequency division multiple access) It can be applied to various wireless access technologies such as. CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented using a radio technology such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented with a wireless technology such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), and the like. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with a system based on IEEE 802.16e. UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) that uses evolved-UMTSterrestrial radio access (E-UTRA), and employs OFDMA in downlink and SC- Adopt FDMA. As described above, the present embodiments may be applied to a wireless access technology currently disclosed or commercialized, and may be applied to a wireless access technology currently being developed or to be developed in the future.

Meanwhile, a terminal in the present specification is a generic concept that refers to a device including a wireless communication module that performs communication with a base station in a wireless communication system, and is a UE in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio). In addition to (User Equipment), it should be interpreted as a concept that includes all of MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), and wireless device in GSM. In addition, the terminal may be a user's portable device such as a smart phone according to the usage type, and in the V2X communication system, it may mean a vehicle, a device including a wireless communication module in the vehicle, and the like. In addition, in the case of a machine type communication system, it may mean an MTC terminal or an M2M terminal equipped with a communication module so that machine type communication is performed.

The base station or cell of the present specification refers to the end of communication with the terminal in terms of the network, and Node-B (Node-B), eNB (evolved Node-B), gNB (gNode-B), LPN (Low Power Node), Sector, Site, various types of antennas, BTS (Base Transceiver System), Access Point, Point (e.g., Transmit Point, Receiving Point, Transmitting Point), 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.

In the various cells listed above, since there is a base station controlling each cell, the base station can be interpreted in two meanings. 1) In relation to the radio area, the device itself may provide a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, and a small cell, or 2) the radio area itself may be indicated. In 1), all devices that are controlled by the same entity that provide a predetermined wireless area are controlled by the same entity, or all devices that interact to form a wireless area in collaboration are instructed to the base station. A point, a transmission/reception point, a transmission point, a reception point, etc. may be an embodiment of a base station according to the configuration method of the wireless area. In 2), it is possible to instruct the base station to the radio region itself that receives or transmits a signal from the viewpoint of the user terminal or the viewpoint of a neighboring base station.

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

Uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data to a base station by a UE, and downlink (Downlink, DL, or downlink) refers to a method of transmitting and receiving data to a UE by a base station. The downlink may refer to a communication or communication path from multiple transmission/reception points to the terminal, and the uplink may refer to a communication or communication path from the terminal to multiple transmission/reception points. In this case, in the downlink, the transmitter may be a part of the multiple transmission/reception points, and the receiver may be a part of the terminal. In addition, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of the multiple transmission/reception points.

Uplink and downlink transmit and receive control information through a control channel such as Physical Downlink Control CHannel (PDCCH), Physical Uplink Control CHannel (PUCCH), and the like, and The same data channel is configured to transmit and receive data. Hereinafter, a situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed in the form of'transmitting and receiving PUCCH, PUSCH, PDCCH and PDSCH'. do.

In order to clarify the description, hereinafter, the present technical idea is mainly described with respect to a 3GPP LTE/LTE-A/NR (New RAT) communication system, but the present technical feature is not limited thereto.

After research on 4G (4th-Generation) communication technology, 3GPP is conducting research on 5G (5th-Generation) communication technology to meet the requirements of ITU-R's next-generation wireless access technology. Specifically, 3GPP is conducting research on LTE-A pro, which has improved LTE-Advanced technology as a 5G communication technology in accordance with the requirements of ITU-R, and a new NR communication technology separate from 4G communication technology. It is expected that both LTE-A pro and NR will be submitted as 5G communication technology, but in the following, for convenience of explanation, these embodiments will be described focusing on NR.

The operation scenario in NR defined various operation scenarios by adding considerations to satellites, automobiles, and new verticals from the existing 4G LTE scenario.In terms of service, eMBB (Enhanced Mobile Broadband) scenario, high terminal density, but wide It is deployed in the range and supports the mMTC (Massive Machine Communication) scenario that requires a low data rate and asynchronous connection, and the URLLC (Ultra Reliability and Low Latency) scenario that requires high responsiveness and reliability and supports high-speed mobility. .

In order to satisfy this scenario, NR discloses a wireless communication system to which a new waveform and frame structure technology, a low latency technology, a mmWave support technology, and a forward compatible provision technology are applied. In particular, in the NR system, various technical changes are proposed in terms of flexibility to provide forward compatibility. Main technical features will be described below with reference to the drawings.

<NR system general>

1 is a diagram schematically showing a structure of an NR system to which this embodiment can be applied.

1, the NR system is divided into 5GC (5G Core Network) and NR-RAN parts, and NG-RAN controls user plane (SDAP/PDCP/RLC/MAC/PHY) and UE (User Equipment). It is composed of gNB and ng-eNB that provide plane (RRC) protocol termination. The gNB or gNB and ng-eNB are interconnected through an Xn interface. The gNB and ng-eNB are each connected to 5GC through the NG interface. The 5GC may include an Access and Mobility Management Function (AMF) in charge of a control plane such as a terminal access and mobility control function, and a User Plane Function (UPF) in charge of a control function for user data. NR includes support for both frequency bands below 6GHz (FR1, Frequency Range 1) and frequencies above 6GHz (FR2, Frequency Range 2).

gNB means a base station that provides NR user plane and control plane protocol termination to a terminal, and ng-eNB means a base station that provides E-UTRA user plane and control plane protocol termination to a terminal. The base station described in the present specification should be understood in a sense encompassing gNB and ng-eNB, and may be used as a means to distinguish between gNB or ng-eNB as necessary.

<NR wave form, numer roller and frame structure>

In NR, a CP-OFDM waveform using a cyclic prefix is used for downlink transmission, and CP-OFDM or DFT-s-OFDM is used for uplink transmission. OFDM technology is easy to combine with MIMO (Multiple Input Multiple Output), and has the advantage of being able to use a low complexity receiver with high frequency efficiency.

On the other hand, in NR, since the requirements for data rate, delay rate, and coverage are different for each of the three scenarios described above, it is necessary to efficiently satisfy the requirements for each scenario through a frequency band constituting an arbitrary NR system. . To this end, a technique for efficiently multiplexing a plurality of different numerology-based radio resources has been proposed.

값이 2의 지수 값으로 사용되어 지수적으로 변경된다.Specifically, the NR transmission neuron is determined based on sub-carrier spacing and CP (Cyclic prefix), based on 15khz as shown in Table 1 below.

The value is used as an exponential value of 2 and changes exponentially.

Subcarrier spacing Cyclic prefix Supported for data Supported for synch 0 15 Normal Yes Yes One 30 Normal Yes Yes 2 60 Normal, Extended Yes No 3 120 Normal Yes Yes 4 240 Normal No Yes

As shown in Table 1 above, the NR numer rollers can be classified into 5 types according to the subcarrier interval. This is different from the fixed subcarrier spacing of 15khz of LTE, one of the 4G communication technologies. Specifically, subcarrier intervals used for data transmission in NR are 15, 30, 60, and 120khz, and subcarrier intervals used for synchronization signal transmission are 15, 30, 12, and 240khz. In addition, the extended CP is applied only to the 60khz subcarrier interval. Meanwhile, a frame structure in NR is defined as a frame having a length of 10 ms consisting of 10 subframes having the same length of 1 ms. One frame can be divided into 5 ms half frames, and each half frame includes 5 subframes. In the case of the 15khz subcarrier interval, one subframe consists of 1 slot, and each slot consists of 14 OFDM symbols.

2 is a diagram for explaining a frame structure in an NR system to which this embodiment can be applied.

Referring to FIG. 2, in the case of a normal CP, a slot is fixedly composed of 14 OFDM symbols, but the length of the slot may vary according to the subcarrier interval. For example, in the case of a newer roller having a 15khz subcarrier interval, a slot is 1ms long and has the same length as the subframe. In contrast, in the case of a newer roller with a 30khz subcarrier spacing, a slot consists of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5ms. That is, the subframe and the frame are defined with a fixed time length, and the slot is defined by the number of symbols, and the time length may vary according to the subcarrier interval.

Meanwhile, NR defines a basic unit of scheduling as a slot, and introduces a mini-slot (or sub-slot or non-slot based schedule) in order to reduce the transmission delay of the radio section. If a wide subcarrier spacing is used, the length of one slot is shortened in inverse proportion, so that transmission delay in the radio section can be reduced. The mini-slot (or sub-slot) is for efficient support for the URLLC scenario, and scheduling is possible in units of 2, 4, or 7 symbols.

In addition, unlike LTE, NR defines uplink and downlink resource allocation as a symbol level within one slot. In order to reduce HARQ delay, a slot structure capable of transmitting HARQ ACK/NACK directly within a transmission slot has been defined, and this slot structure is named and described as a self-contained structure.

NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in Rel-15. In addition, a common frame structure constituting an FDD or TDD frame is supported through a combination of various slots. For example, a slot structure in which all symbols of a slot are set to downlink, a slot structure in which all symbols are set to uplink, and a slot structure in which a downlink symbol and an uplink symbol are combined are supported. In addition, NR supports that data transmission is distributed and scheduled in one or more slots. Accordingly, the base station may inform the UE of whether the slot is a downlink slot, an uplink slot, or a flexible slot using a slot format indicator (SFI). The base station can indicate the slot format by indicating the index of the table configured through RRC signaling specifically through the UE, using SFI, and dynamically indicate through Downlink Control Information (DCI) or statically or semi-statically through RRC. May be.

<NR physical resource>

Regarding the physical resource in NR, the antenna port, resource grid, resource element, resource block, bandwidth part, etc. are considered. Can be.

The antenna port is defined so that a channel carrying a symbol on an antenna port can be inferred from a channel carrying another symbol on the same antenna port. When the large-scale property of a channel carrying a symbol on one antenna port can be inferred from a channel carrying a symbol on another antenna port, the two antenna ports are QC/QCL (quasi co-located or quasi co-location) relationship. Here, the wide-range characteristic includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

3 is a diagram illustrating a resource grid supported by a radio access technology to which the present embodiment can be applied.

Referring to FIG. 3, since the NR supports a plurality of neurons in the same carrier, a resource grid may exist according to each neuron in the resource grid. In addition, the resource grid may exist according to an antenna port, a subcarrier spacing, and a transmission direction.

A resource block consists of 12 subcarriers, and is defined only in the frequency domain. In addition, a resource element consists of one OFDM symbol and one subcarrier. Accordingly, as shown in FIG. 3, the size of one resource block may vary according to the subcarrier interval. In addition, NR defines “Point A” that serves as a common reference point for the resource block grid, a common resource block, and a virtual resource block.

4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

In NR, unlike LTE where the carrier bandwidth is fixed at 20Mhz, the maximum carrier bandwidth is set from 50Mhz to 400Mhz for each subcarrier interval. Therefore, it is not assumed that all terminals use all of these carrier bandwidths. Accordingly, in the NR, as shown in FIG. 4, the terminal can use the bandwidth part by designating the bandwidth part within the carrier bandwidth. In addition, the bandwidth part is associated with one neurology and is composed of a subset of consecutive common resource blocks, and can be dynamically activated over time. The UE is configured with up to four bandwidth parts, respectively, in uplink and downlink, and data is transmitted and received using the active bandwidth part at a given time.

In the case of a paired spectrum, uplink and downlink bandwidth parts are independently set, and in the case of an unpaired spectrum, unnecessary frequency re-tuning between downlink and uplink operations is prevented. For this purpose, the downlink and uplink bandwidth parts are set in pairs to share a center frequency.

<NR initial connection>

In NR, the terminal accesses the base station and performs cell search and random access procedures to perform communication.

Cell search is a procedure in which a terminal synchronizes with a cell of a corresponding base station, obtains a physical layer cell ID, and obtains system information by using a synchronization signal block (SSB) transmitted by a base station.

5 is a diagram illustrating a synchronization signal block in a wireless access technology to which the present embodiment can be applied.

Referring to FIG. 5, an SSB consists of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) occupying 1 symbol and 127 subcarriers, respectively, and a PBCH spanning 3 OFDM symbols and 240 subcarriers.

The terminal receives the SSB by monitoring the SSB in the time and frequency domain.

SSB can be transmitted up to 64 times in 5ms. A plurality of SSBs are transmitted in different transmission beams within 5 ms time, and the UE performs detection on the assumption that SSBs are transmitted every 20 ms period based on one specific beam used for transmission. The number of beams that can be used for SSB transmission within 5 ms time may increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted under 3GHz, and up to 8 in a frequency band of 3 to 6GHz, and a maximum of 64 different beams in a frequency band of 6GHz or higher can be used to transmit SSBs.

Two SSBs are included in one slot, and the start symbol and the number of repetitions in the slot are determined according to the subcarrier interval as follows.

Meanwhile, the SSB is not transmitted at the center frequency of the carrier bandwidth, unlike the conventional LTE SS. That is, the SSB may be transmitted even in a place other than the center of the system band, and a plurality of SSBs may be transmitted in the frequency domain when broadband operation is supported. Accordingly, the UE monitors the SSB by using a synchronization raster, which is a candidate frequency location for monitoring the SSB. The carrier raster and synchronization raster, which are information on the center frequency of the channel for initial access, have been newly defined in NR, and the synchronization raster has a wider frequency interval than the carrier raster to support fast SSB search of the terminal. I can.

The UE can acquire the MIB through the PBCH of the SSB. The MIB (Master Information Block) includes minimum information for the terminal to receive remaining system information (RMSI, Remaining Minimum System Information) broadcast by the network. In addition, PBCH is information about the location of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (e.g., SIB1 neurology information, information related to SIB1 CORESET, search space information, PDCCH Related parameter information, etc.), offset information between the common resource block and the SSB (the position of the absolute SSB in the carrier is transmitted through SIB1), and the like. Here, the SIB1 neurology information is equally applied to messages 2 and 4 of the random access procedure for accessing the base station after the terminal completes the cell search procedure.

The aforementioned RMSI means SIB1 (System Information Block 1), and SIB1 is broadcast periodically (ex, 160 ms) in a cell. SIB1 includes information necessary for the UE to perform an initial random access procedure, and is periodically transmitted through the PDSCH. In order for the UE to receive SIB1, it is necessary to receive newer roller information used for SIB1 transmission and CORESET (Control Resource Set) information used for SIB1 scheduling through the PBCH. The UE checks scheduling information for SIB1 using SI-RNTI in CORESET, and acquires SIB1 on the PDSCH according to the scheduling information. SIBs other than SIB1 may be periodically transmitted or may be transmitted according to the request of the terminal.

6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.

Referring to FIG. 6, when the cell search is completed, the UE transmits a random access preamble for random access to the base station. The random access preamble is transmitted through the PRACH. Specifically, the random access preamble is transmitted to the base station through a PRACH consisting of consecutive radio resources in a specific slot that is periodically repeated. In general, when a terminal initially accesses a cell, a contention-based random access procedure is performed, and when a random access is performed for beam failure recovery (BFR), a contention-free random access procedure is performed.

The terminal receives a random access response to the transmitted random access preamble. The random access response may include a random access preamble identifier (ID), a UL Grant (uplink radio resource), a temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier), and a TAC (Time Alignment Command). Since one random access response may include random access response information for one or more terminals, the random access preamble identifier may be included to inform which terminal the included UL Grant, temporary C-RNTI, and TAC are valid. The random access preamble identifier may be an identifier for the random access preamble received by the base station. TAC may be included as information for the UE to adjust uplink synchronization. The random access response may be indicated by a random access identifier on the PDCCH, that is, a Random Access-Radio Network Temporary Identifier (RA-RNTI).

Upon receiving a valid random access response, the terminal processes information included in the random access response and performs scheduled transmission to the base station. For example, the UE applies TAC and stores a temporary C-RNTI. Also, by using UL Grant, data stored in the buffer of the terminal or newly generated data is transmitted to the base station. In this case, information for identifying the terminal should be included.

Finally, the terminal receives a downlink message for resolving contention.

<NR CORESET>

The downlink control channel in NR is transmitted in CORESET (Control Resource Set) having a length of 1 to 3 symbols, and transmits uplink/downlink scheduling information, SFI (Slot Format Index), and TPC (Transmit Power Control) information. .

In this way, NR introduced the concept of CORESET to secure system flexibility. CORESET (Control Resource Set) means a time-frequency resource for a downlink control signal. The terminal may decode the control channel candidate using one or more search spaces in the CORESET time-frequency resource. A QCL (Quasi CoLocation) assumption for each CORESET is set, and this is used to inform the characteristics of the analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay, which are characteristics assumed by conventional QCL.

7 is a diagram for explaining CORESET.

Referring to FIG. 7, CORESET may exist in various forms within a carrier bandwidth within one slot, and CORESET may consist of up to 3 OFDM symbols in the time domain. In addition, CORESET is defined as a multiple of 6 resource blocks up to the carrier bandwidth in the frequency domain.

The first CORESET is indicated through the MIB as part of the initial bandwidth part configuration so that additional configuration information and system information can be received from the network. After establishing the connection with the base station, the terminal may receive and configure one or more CORESET information through RRC signaling.

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) Can be interpreted as a meaning used in the past or present, or in various meanings used in the future.

New Radio (NR)

3GPP recently approved “Study on New Radio Access Technology”, a study item for research on next-generation radio access technology (ie 5G radio access technology), and based on this, RAN WG1 has a frame structure for each NR (New Radio). , channel coding & modulation, waveform & multiple access scheme, etc. are being designed. NR is required to be designed to satisfy not only an improved data transmission rate compared to LTE, but also various QoS requirements for each segmented and specified usage scenario. In particular, eMBB (Enhancement Mobile BroadBand), mMTC (massive MTC), and URLLC (Ultra Reliable and Low Latency Communications) are defined as representative usage scenarios of NR, and as a method to satisfy the requirements for each usage scenario, a flexible frame compared to LTE Structure design is required. Since each usage scenario has different requirements for data rates, latency, reliability, coverage, etc., it is a method to efficiently satisfy the requirements for each usage scenario through the frequency band constituting an arbitrary NR system. eg subcarrier spacing, subframe, TTI, etc.) There is a need for a method of efficiently multiplexing based radio resource units.

As one method for this, a method of multiplexing and supporting based on TDM, FDM, or TDM/FDM through one or more NR component carrier(s) for numerology having different subcarrier spacing values, and scheduling units in the time domain. In the configuration, a discussion was made on how to support more than one time unit. In this regard, in NR, a subframe was defined as a kind of time domain structure, and 14 OFDM symbols of normal CP overhead based on 15kHz SCS (Sub-Carrier Spacing), which is the same as LTE, as a reference numerology for defining the corresponding subframe duration. It was decided to define a single subframe duration composed of. Accordingly, in NR, the subframe has a time duration of 1 ms. However, unlike LTE, a subframe of NR is an absolute reference time duration, and slots and mini-slots may be defined as time units that are the basis of actual uplink/downlink data scheduling. In this case, the number and y values of OFDM symbols constituting the corresponding slot are determined to have a value of y=14 regardless of the SCS value in the case of normal CP.

Accordingly, a random slot consists of 14 symbols, and according to the transmission direction of the corresponding slot, all symbols are used for DL transmission, or all symbols are used for UL transmission, or DL portion + (gap) + It can be used in the form of a UL portion.

In addition, a mini-slot consisting of fewer symbols than the slot is defined in an arbitrary numerology (or SCS), and based on this, a short time-domain scheduling interval for uplink/downlink data transmission/reception is set, or slot aggregation A long time-domain scheduling interval for transmitting/receiving uplink/downlink data may be configured through. In particular, in the case of transmission and reception of latency critical data such as URLLC, it is difficult to satisfy the latency requirement when scheduling is performed in a slot unit based on 1ms (14 symbols) defined in a numerology-based frame structure with a small SCS value such as 15kHz. Therefore, for this purpose, a mini-slot consisting of fewer OFDM symbols than the corresponding slot can be defined, and based on this, it can be defined to perform scheduling for latency critical data such as the corresponding URLLC.

Alternatively, as described above, by multiplexing and supporting numerology having different SCS values in one NR Carrier in a TDM and/or FDM method, based on the slot (or mini-slot) length defined for each numerology. Scheduling data according to latency requirements is also being considered. For example, as shown in Figure 1 below, when the SCS is 60 kHz, the symbol length is reduced by about 1/4 compared to the SCS 15 kHz, so when one slot is configured with the same 14 OFDM symbols, the corresponding 15 kHz-based slot While the length becomes 1ms, the slot length based on 60kHz is reduced to about 0.25ms.

As described above, in NR, by defining different SCS or different TTI lengths, a discussion on a method of satisfying the requirements of URLLC and eMBB is in progress.

PDCCH

In NR and LTE/LTE-A systems, L1 control information such as DL assignment Downlink Control Information (DCI) and UL grant DCI is transmitted and received through PDCCH. A control channel element (CCE) is defined as a resource unit for transmission of the PDCCH, and in NR, a control resource set (CORESET), which is a frequency/time resource for transmission of a PDCCH, may be set for each terminal. In addition, each CORESET may consist of one or more search spaces composed of one or more PDCCH candidates for the UE to monitor the PDCCH.

Wider bandwidth operations

In the case of the existing LTE system, a scalable bandwidth operation for any LTC CC (Component Carrier) was supported. That is, depending on the frequency deployment scenario, in configuring one LTE CC, an LTE operator could configure a bandwidth of a minimum of 1.4 MHz to a maximum of 20 MHz, and a normal LTE terminal has a 20 MHz bandwidth for one LTE CC. Supported transmission/reception capability.

However, in the case of NR, the design is made to enable support for NR terminals having different transmission/reception bandwidth capabilities through one wideband NR CC, and accordingly, it is subdivided for arbitrary NR CCs as shown in Figure 2 below. It is required to configure one or more bandwidth part(s) consisting of the bandwidth, and to support flexible wider bandwidth operation through different bandwidth part configuration and activation for each terminal.

Specifically, in the NR, one or more bandwidth parts can be configured through one serving cell configured from the viewpoint of the UE, and the UE activates one DL bandwidth part and one UL bandwidth part in the corresponding serving cell to provide uplink/downlink data It is defined to be used for sending and receiving. In addition, when a plurality of serving cells are configured in the corresponding terminal, that is, for a terminal to which CA is applied, one DL bandwidth part and/or UL bandwidth part are activated for each serving cell, and up/down direction is performed using radio resources of the corresponding serving cell. It is defined to be used for sending and receiving link data.

Specifically, an initial bandwidth part for an initial access procedure of a terminal in an arbitrary serving cell is defined, one or more UE-specific bandwidth part(s) is configured through dedicated RRC signaling for each terminal, and fallback for each terminal A default bandwidth part for operation can be defined.

However, it can be defined to activate and use a plurality of DL and/or UL bandwidth parts at the same time according to the capability and bandwidth part(s) configuration of the terminal in an arbitrary serving cell, but in NR rel-15, an arbitrary terminal It was defined to activate and use only one DL bandwidth part and UL bandwidth part at a time.

Discontinuous transmission indication for DL

As a multiplexing method for downlink data of different transmission durations defined in NR, a method of indicating discontinuous transmission through group common PDCCH has been defined. That is, when a certain UE receives indication information for discontinuous transmission, the UE preemption for data transmission of another UE for some time/frequency resources among PDSCH transmission resources allocated for the UE according to the indication information Was able to confirm the presence or absence of.

The present invention proposes a preemption-based uplink data channel transmission/reception method for efficiently multiplexing uplink data transmission resources between terminals having different latency requirements.

As a usage scenario provided by NR and LTE/LTE-A systems, the importance of efficient support for data related to URLLC service that requires low latency/high reliability along with eMBB service-related data support to maximize data transmission speed is increasing. Are doing.

In particular, in the case of uplink data transmission for URLLC in order to satisfy a requirement for a delay time, a part of uplink data transmission resources of another terminal that has already been scheduled may be preempted and transmitted, similar to the downlink case described above.

To this end, the UL preemption indication or discontinuous UL transmission indication or suspending UL transmission in order to stop the UL data channel (PUSCH) transmission of the UE currently transmitting uplink data and use the corresponding resource for UL data transmission of the URLLC UE. It is necessary to support an indication or a UL cancellation indication (however, the present invention is not limited by a specific term for a corresponding indication) and define a specific UE operation method for this. In the present invention, a UL cancellation indication is used for convenience of description, but as described above, this may be referred to as a UL preemption indication, a discontinuous UL transmission indication or suspending UL transmission indication or another term, by its name. The present invention is not limited.

Point 1. How to operate the UE when receiving UL preemption indication information

Scheme 1. Action to cancel all remaining PUSCH transmission

Upon receiving the UL cancellation indication information, the UE does not perform PUSCH transmission in the remaining OFDM symbol (s) among the resources allocated for the PUSCH being transmitted, that is, cancels all remaining PUSCH transmission. Can be defined.

Specifically, as shown in Figure 3 below, the UE receiving the UL cancellation indication is the time at which the corresponding UL cancellation indication information is transmitted in the corresponding slot (eg, the last symbol in which UL cancellation indication information is transmitted, or the last symbol in which UL cancellation indication information is transmitted). It can be defined to cancel all PUSCH transmissions after a certain timing gap and K from an uplink symbol corresponding to (

In this case, the corresponding K value may be defined to be set by the base station/network and transmitted to the terminal through explicit signaling. For example, it is set by the base station/network and transmitted to the terminal through UE-specific or cell-specific/UE-group common higher layer signaling, or dynamic through L1 control signaling (eg, included in the corresponding UL cancellation indication information). Can be set and transmitted.

As another method of defining the corresponding K value, the corresponding K value can be defined to be implicitly set by the capability of the terminal, or set by the base station/network based on this, and transmitted to the terminal through explicit signaling as described above.

As another method of defining the corresponding K value, the corresponding K value can be implicitly determined. For example, it may be determined as a function of a numerology/SCS value of DL or UL, or may be defined to determine a corresponding value as a function of a monitoring period value of the UL cancellation indication.

However, as shown in the figure above, when PUSCH resource allocation is performed within the slot boundary, that is, when slot-based or mini-slot-based PUSCH resource allocation is performed, the operation of stopping PUSCH transmission in the remaining symbols within the corresponding slot boundary. However, when aggregated slot-based PUSCH resource allocation is made, suspending only for remaining PUSCH transmission in the slot boundary in which the corresponding UL preemption indication is received, and PUSCH transmission through the remaining slots is defined to be performed normally, or the UL It can be defined to stop all remaining PUSCH transmission of aggregated slots after the preemption indication is received.

Scheme 2. Operation of resuming PUSCH transmission after canceling PUSCH transmission in some time duration of the remaining PUSCH transmission

The UE receiving the UL cancellation indication information may define to stop only the PUSCH transmission corresponding to the OFDM symbol corresponding to a partial time duration for the PUSCH transmission being transmitted as shown in Figure 4 below.

Specifically, as shown in Figure 4 below, the UE receiving the UL cancellation indication is the time at which the corresponding UL cancellation indication information is transmitted (eg, the last symbol in which UL cancellation indication information is transmitted, or the last symbol in which UL cancellation indication information is transmitted). The PUSCH transmission corresponding to the time duration and M among PUSCH transmissions after a certain timing gap from the uplink symbol) may be defined to resume PUSCH transmission after suspending.

In this case, a method of determining the corresponding K value may be defined to be set by the base station/network and transmitted to the terminal through explicit signaling, as in Method 1 above. For example, it is set by the base station/network and transmitted to the terminal through UE-specific or cell-specific/UE-group common higher layer signaling, or dynamic through L1 control signaling (eg, included in the corresponding UL cancellation indication information). Can be set and transmitted.

As another method of defining the corresponding K value, the corresponding K value can be defined to be implicitly set by the capability of the terminal, or set by the base station/network based on this, and transmitted to the terminal through explicit signaling as described above.

As another method of defining the corresponding K value, the corresponding K value can be implicitly determined. For example, it may be determined as a function of a numerology/SCS value of DL or UL, or may be defined to determine a corresponding value as a function of a monitoring period value of the UL cancellation indication.

In addition, the method of determining the suspending or pausing duration, and the M value can be defined to be set by the base station/network and transmitted to the terminal through explicit signaling, similar to the method of determining the K value. For example, it is set by the base station/network and transmitted to the terminal through UE-specific or cell-specific/UE-group common higher layer signaling, or dynamic through L1 control signaling (eg, included in the corresponding UL cancellation indication information). Can be set and transmitted. Alternatively, the corresponding M value may be implicitly set by the capability of the UE, or set by the base station/network based on this, and defined to transmit to the UE through explicit signaling as described above.

As another method of defining the corresponding M value, the corresponding M value may be implicitly determined. For example, it may be determined as a function of a numerology/SCS value of DL or UL, or may be defined to determine a corresponding value as a function of a monitoring period value of the UL cancellation indication.

Additionally, when PUSCH transmission is resumed after a certain duration, it may be defined to explicitly signal the base station/network.

Additionally, OFDM symbol or slot may be applied as a unit for defining the K value or M value, and the numerology or SCS value for defining a symbol or slot boundary is determined by SCS applied for PUSCH transmission, or DL It can be defined to be determined by the SCS of (eg PDCCH for UL preemption indication transmission).

Point 2. How to set whether to fully-cancelation for the remaining resource or resume PUSCH transmission

Upon receiving the UL cancellation indication, the base station/network may define a scheme to be applied among scheme 1 and scheme 2 of point 1 as an operation scheme of the terminal.

That is, when receiving UL cancellation indication information as in method 1 of point 1, a terminal operation that cancels all subsequent PUSCH transmissions in a corresponding slot is referred to as mode 1, and as in method 2, a certain time duration among subsequent PUSCH transmissions During the period, only the PUSCH transmission is dropped and the UE operation to resume the remaining PUSCH transmission after the corresponding duration may be referred to as mode 2. (However, the present invention is not limited by names such as mode 1 and mode 2.) Accordingly, for any terminal configured to monitor the UL cancellation indication message in the base station/network, when receiving the corresponding UL cancellation indication message, An operation method, that is, whether to operate based on mode 1 or mode 2 can be set and defined to explicitly or implicitly signal this to respective terminals.

As an explicitly signaling method among the above-described UL cancellation mode setting methods by the base station/network, the operation mode of the terminal according to the reception of the corresponding UL cancellation indication is semi-statically configured through UE-specific higher layer signaling or cell-specific higher layer signaling. Can be defined to

As another method, it may be defined to dynamically set an operation mode of a terminal according to reception of a corresponding UL cancellation indication through L1 control signaling. For example, it may be defined to include information about the UL cancellation mode setting in the corresponding UL cancellation indication message.

As an implicitly signaling method among the UL cancellation mode setting schemes by the base station/network, the time duration in which UL cancellation is indicated in the corresponding slot (ie, corresponding to the M value of Scheme 2) and the total allocated PUSCH transmission duration or remaining PUSCH The UL cancellation mode may be defined as a ratio of the duration of the resource. For example, when the indicated canceled PUSCH transmission duration compared to the total allocated PUSCH transmission duration is less than a certain ratio, or if the indicated canceled PUSCH transmission duration compared to the remaining PUSCH transmission duration is less than a certain ratio, the mode 2 is operated (i.e., remaining It can be defined to operate to resume PUSCH transmission), otherwise to operate in mode 1 (ie, to cancel all remaining PUSCH transmission transmissions). As an example according to the present scheme, a corresponding mode may be determined according to whether slot aggregation or repetition is applied for random PUSCH transmission. That is, in the case of PUSCH transmission through a single slot, when UL cancelation is indicated, operation in mode 1 (i.e., operation to cancel all remaining PUSCH transmission), and across a plurality of slots through slot aggregation or repetition For PUSCH transmission, it may be defined to operate based on mode 2 in which PUSCH transmission is resumed in other slots except for the slot in which UL cancelation is indicated. Alternatively, mode 2 may be applied only in the case of PUSCH repetition or slot aggregation through a plurality of slots, but mode 2 may be applied only when the number of slots in which repetition or aggregation for the corresponding PUSCH transmission occurs is more than a certain number. . Alternatively, if the number of slots in which UL cancelation has occurred among slots allocated for the corresponding PUSCH transmission is a certain ratio or more than a certain number, it may be defined to operate based on mode 1 in which all PUSCH transmissions are also canceled in the remaining slots. In this scheme, the ratio for determining the mode may be set by the base station and indicated through RRC signaling or L1 control signaling, or may have a fixed value.

As another method of implicitly signaling among the above-described UL cancellation mode setting methods by the base station/network, it is possible to determine whether UCI transmission is included in the PUSCH resource (that is, the resource corresponding to the suspended PUSCH transmission part of Figure 4) in which the corresponding PUSCH cancellation has occurred. Can be defined to be determined by That is, uplink control information (UCI) such as HARQ-ACK or CSI in addition to UL-SCH may be piggybacked and transmitted to PUSCH transmission in an arbitrary terminal. When cancellation of the PUSCH transmission is indicated according to the UL cancellation indication for the PUSCH transmission in which UCI piggyback has been made, when the canceled PUSCH resource fully or partially includes the piggybacked UCI transmission resource, the remaining PUSCH resource as in mode 2 It can be defined to resume transmission for, otherwise, to drop transmission for remaining PUSCH resources as in mode 1. Alternatively, the mode may be defined to be determined according to whether some UCI types (e.g. HARQ ACK) are included in the UCI.

In addition, in determining the PUSCH transmission mode according to the UL cancelation indication, a corresponding mode may be defined as a combination of the above embodiments. For example, whether to apply mode 2 during PUSCH repetition is set by the base station/network through UE-specific or cell-specific higher layer signaling, or may be indicated through L1 control signaling, and the application of the mode 2 is configured/indicated. In this case, whether or not the actual mode 2 operation is applied is determined whether repetition or slot aggregation is applied to any PUSCH transmission indicated to the corresponding terminal, or whether repetition is applied, as well as the number of repetitions or the slot in which UL cancelation is indicated relative to the total number of repetitions. It can be defined that the mode 2 application is determined by the number ratio of

12 is a diagram showing a configuration of a base station 1000 according to another embodiment.

Referring to FIG. 12, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The control unit 1010 performs the overall operation of the base station 1000 according to transmission and reception of a preemption-based uplink data channel for efficiently multiplexing uplink data transmission resources between terminals having different latency requirements required for carrying out the above-described present invention. Control.

The transmission unit 1020 and the reception unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention with the terminal.

13 is a diagram showing the configuration of a user terminal 1100 according to another embodiment.

Referring to FIG. 13, a user terminal 1100 according to another embodiment includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

The receiver 1110 receives downlink control information, data, and a message from the base station through a corresponding channel.

In addition, the control unit 1120 is a preemption-based uplink data channel transmission and reception of the overall user terminal 1100 for efficiently multiplexing uplink data transmission resources between terminals having different latency requirements required for carrying out the present invention. Control the operation.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through a corresponding channel.

The above-described embodiments may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP and 3GPP2 wireless access systems. That is, steps, configurations, and parts not described in order to clearly reveal the present technical idea among the embodiments may be supported by the aforementioned standard documents. In addition, all terms disclosed in the present specification can be described by the standard documents disclosed above.

The above-described embodiments can be implemented through various means. For example, the present embodiments may be implemented by hardware, firmware, software, or a combination thereof.

In the case of implementation by hardware, the method according to the embodiments includes one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), and FPGAs. (Field Programmable Gate Arrays), can be implemented by a processor, a controller, a microcontroller, a microprocessor.

In the case of implementation by firmware or software, the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor through various known means.

In addition, terms such as "system", "processor", "controller", "component", "module", "interface", "model", and "unit" described above are generally used in terms of computer-related entity hardware, hardware and software. It can mean a combination, software, or running software. For example, the above-described components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, an execution thread, a program, and/or a computer. For example, components can be both a controller or processor and an application running on a controller or processor. One or more components can reside within a process and/or thread of execution, and components can reside on one machine or be deployed on more than one machine.

The description above and the accompanying drawings are merely illustrative of the spirit of the present technology, and those of ordinary skill in the art can combine, separate, replace, and use configurations within a range not departing from the essential characteristics of the present technology. Various modifications and variations such as changes will be possible. Accordingly, the embodiments disclosed in the present specification are not intended to limit the present technical idea, but to describe it, and the scope of the present technical idea is not limited by these embodiments. The scope of protection of the present technical idea should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present specification.

Claims (1)

In the method for the UE to transmit uplink data,
Receiving preemption indication information from a base station; And
And determining at least one of whether to transmit commercial uplink transmission data, whether to delay transmission, or whether to cancel or resume allocated resources based on the preemption indication information.

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