Method and device for allocating data channel resources for a next-generation wireless access network

Abstract

A method is provided for a base station to allocate a time slot resource for transmitting and receiving a downlink data channel (PDSCH) or an uplink data channel (PUSCH). The method includes allocating a time slot resource for each OFDM symbol based on a slot or mini-slot, transmitting time slot resource configuration information to a terminal, including OFDM symbol allocation data for the OFDM symbols used for transmitting and receiving the data channel in the slot or mini-slot, and transmitting information to a control terminal to select one of the symbol allocation data included in the time slot resource configuration information.

Description

Method and device for allocating data channel resources for a next-generation wireless access network Technical field This disclosure relates to methods and devices for allocating a data channel resource for a next-generation / 5G radio access network (hereafter referred to as new radio (NR)). Background of the technique Recently, 3GPP approved the "Study on New Radio Access Technology," a research topic for next-generation / 5G radio access technology. Based on this study, Radio Access Network Working Group 1 (RAN WG1) has been analyzing frame structures, channel coding and modulation, waveforms, multiple access methods, and other aspects of new radio (NR). The NR needs to be designed not only to provide improved data transmission speeds compared to Long-Term Evolution (LTE) / LTE-Advanced, but also to meet various requirements in detailed and specific use cases. Specifically, enhanced mobile broadband (eMBB), massive machine-like communication (mMTC), and ultra-reliable low-latency communication (URLLC) are proposed as representative use cases for NR. To meet the requirements of these individual scenarios, NR needs to be designed with flexible frame structures compared to LTE / LTE-Advanced. In the typical LTE / LTE-A system, the allocation of an uplink / downlink data resource has been done by resource blocks (RB) on the frequency axis and by subframe on the time axis. Therefore, in a downlink subframe, a UE receives downlink data through all OFDM symbols except for a control region for PDCCH transmission. In an uplink subframe, the UE transmits uplink data through all SC-FDMA symbols of the uplink subframe, or all SC-FDMA symbols except the last symbol if an SRS is configured. In this regard, at the NR, analyses have been carried out to allocate a time-domain resource as well as a frequency resource as a scheduling resource for an uplink / downlink data channel. INTEL CORPORATION: "On PUCCH coverage enhancement", 3GPP DRAFT; R1-1609537 INTEL PUCCH COVERAGE ENHANCEMENT, THIRD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTER; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE, vol. RAN WG1, no. Lisbon (Portugal); October 9, 2016, refers to time-domain resource allocation and DL / UL control signaling in NR. Detailed description of the invention Technical problem One objective of this disclosure is to provide methods for a base station and user equipment to allocate a time-domain resource for downlink data channel (PDSCH) or uplink data channel (PUSCH) transmission / reception in the next-generation / 5G radio access (NR) network. Technical solution The object of the invention is achieved through the subject matter of the independent claims. The dependent claims describe advantageous embodiments. The scope of protection of the invention is limited by the appended claims. Effects of the invention According to the realizations in this disclosure, in the NR, it is possible for a base station and user equipment to transmit or receive a downlink data channel (PDSCH) or an uplink data channel (PUSCH) by means of time-domain resource allocation methods. Brief description of the drawings Figure 1 is a diagram illustrating the allocation of a symbol-level resource for different SCS. Figure 2 is a diagram illustrating time-division multiplexing (TDM) between enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) in one slot. FIG. 3 is a flowchart illustrating a method of a base station allocating a time-domain resource for the purpose of transmitting / receiving a downlink (DL) data channel (PDSCH) or an uplink (UL) data channel (PUSCH) in accordance with the realizations of this disclosure. FIG.4 is a diagram illustrating a UE-specific upper-layer signaling information sequence that includes time-domain resource configuration information in tabular form for downlink (DL) data channel (PDSCH) transmission / reception as in FIG.3. FIG. 5 is a diagram illustrating a portion of a DCI (DL control information) format for DL ​​allocation as in FIG. 3. FIG.6 is a diagram illustrating a UE-specific upper-layer signaling information sequence that includes time-domain resource configuration information in the form of a table for transmitting / receiving the UL (PUSH) data channel as in FIG.3. FIG. 7 is a diagram illustrating a portion of a UL grant DCI format (DL control information) as in FIG. 3. FIG. 8 is a flowchart illustrating a method of a base station allocating a time-domain resource for downlink (DL) data channel (PDSCH) or uplink (UL) data channel (PUSCH) transmission / reception in accordance with an embodiment of this disclosure. FIG.9 is a block diagram illustrating a base station (BS) according to an embodiment of the present disclosure. FIG. 10 is a block diagram illustrating a user equipment (UE) according to an embodiment of the present disclosure. Best way to carry out the invention Hereafter, the realizations of this disclosure will be described in detail with reference to the accompanying drawings. By adding reference numbers to the elements of each drawing, the same elements will be designated with the same reference numbers, if possible, even if shown on different drawings. Furthermore, in the following description of this disclosure, a detailed description of known features and configurations incorporated herein will be omitted where it is determined that such a description might render the subject of this disclosure excessively confusing. In this disclosure, a machine-type communication terminal (MTC) may refer to a terminal that supports low cost (or low complexity), a terminal that supports enhanced coverage, or similar features. In this disclosure, the term MTC may refer to a terminal that supports low cost (or low complexity), a terminal that supports enhanced coverage, and similar features. Furthermore, in this disclosure, the term MTC may refer to a terminal classified in a specific category to support low cost (or low complexity) and / or enhanced coverage. In other words, the MTC terminal may refer to a newly defined low-cost (or low-complexity) UE category / type in 3GPP Release 13 that performs LTE-based MTC-related operations. The MTC terminal may also refer to a UE category / type defined in or before 3GPP Release 12 that supports enhanced coverage compared to typical LTE coverage or supports low power consumption. Alternatively, the MTC device may refer to a newly defined low-cost (or low-complexity) UE category / type in Release 13. In this disclosure, a wireless communication system is widely deployed to provide various communication services, such as voice communication, packet data, etc. The wireless communication system includes user equipment (UE) and a base station (BS, eNB, gNB, or xNB). In this disclosure, UE is defined as a generic term referring to the terminals used in wireless communication. For example, UE may be referred to as, among others, a UE that supports Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), High Speed ​​Packet Access (HSPA), or International Mobile Telecommunications (IMT)-2020 (5G or New Radio), a mobile station (MS) that supports the Global System for Mobile Communications (GSM), a user terminal (UT), a subscriber station (SS), a wireless device, or similar. The base station or cell generally refers to a station that communicates with the UE. The base station or cell is a generic term that refers to, but is not limited to, all the various communication service areas and devices, such as a Node B, an evolved Node B (eNB), a gNB, a low-power node (LPN), a sector, a site, various antenna types, a base transceiver system (BTS), an access point, a point (e.g., a transmit point, a receive point, or a transceive point), a relay node, a megacell, a macrocell, a microcell, a picocell, a femtocell, a remote radio head (RRH), a radio unit (RU), and a small cell. In other words, in this disclosure, the base station or cell is defined as a generic term that collectively includes, in addition to some areas or communication service functions covered by a base station controller (BSC) in CDMA, a Node B in WCDMA, an evolved Node B (eNB) or a sector (site) in LTE, and the like, all of various coverage areas, such as a megacell, a macrocell, a microcell, a picocell, a femtocell and a relay node, RRH, RU, a small cell communication range or the like. Each of the various cells is controlled by a base station. Therefore, the base station can be classified into two categories. The base station can be referred to as 1) an apparatus that forms and provides a corresponding communication service area, such as a megacell, macrocell, microcell, picocell, femtocell, or small cell, or 2) a communication service area. In the case of 1), the base station can be referred to as i) apparatuses that form and provide a communication service area and are controlled by the same entity, or ii) apparatuses that interact and cooperate with each other to form and provide the communication service area. Depending on the communication schemes employed by a base station, the base station may be referred to as an eNB, RRH, antenna, RU, low-power node (LPN), point, transmit / receive point, transmit point, receive point, or similar.In the case of 2), the base station can be a communication service area in itself where UEs can receive signals or transmit signals to other UEs and neighboring base stations. Accordingly, the base station is defined as a generic term that collectively includes the megacell, macrocell, microcell, picocell, femtocell or small cell, RRH, antenna, RU, LPN, point, eNB, transmit / receive point, transmit point, or receive point. In this disclosure, the UE and the base station are two entities used to perform uplink or downlink transmission / reception, incorporating the technology and spirit described herein. The UE and the base station are defined as a generic term and are not limited to specific terms or words.In this case, the uplink (UL) refers to the transmission / reception of data by a UE to / from a base station, and the downlink (DL) refers to the transmission / reception of data by a base station to / from a UE. Any of the multiple access techniques can be applied to the wireless communication system. For example, the wireless communication system may employ various multiple access techniques, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), OFDM-TDMA, OFDM-FDMA, OFDM-CDMA, or similar techniques. The implementations in accordance with this disclosure may be applied to resource allocation in (i) asynchronous wireless communication evolving toward LTE / LTE-Advanced and IMT-2020 from GSM, WCDMA, and HSPA, and (ii) synchronous wireless communication evolving toward CDMA, CDMA-2000, and UMB.This disclosure is not intended to be limited to any particular field of wireless communication and is intended to include all technical fields to which the spirit of this disclosure may be applied. The transmission of the upper limit (UL) and the lower limit (DL) can be based on either i) a time-division duplex (TDD) technique, which transmits over different time slots, or ii) a frequency-division duplex (FDD) technique, which transmits over different frequencies. Furthermore, in some systems, such as LTE or LTE-Advanced, a related standard specification defines an UL and a DL that are established based on a single carrier or a pair of carriers. To transmit / receive control information, the UL and DL can be configured with one or more control channels, such as a physical DL control channel (PDCCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PITCH), a physical UP control channel (PUCCH), an enhanced physical DL control channel (EPDCCH), or similar channels.To transmit / receive data, the UL and DL can be configured with one or more data channels, such as a physical DL shared channel (PDSCH), a physical UL shared channel (PUSCH), or similar. At the same time, control information can be transmitted via the EPDCCH (enhanced PDCCH or extended PDCCH). In this disclosure, the cell may refer to a coverage of a signal transmitted from a transmission point or a transmission / reception point, to a component carrier that has the coverage of the signal transmitted from the transmission point or the transmission / reception point, or to the transmission / reception point itself. A wireless communication system to which at least one embodiment applies may be i) a coordinated multipoint transmit / receive system (CoMP system) in which two or more transmit / receive points cooperate to transmit a signal, ii) a coordinated multi-antenna transmit system, or iii) a coordinated multi-cell communication system. The CoMP system may include at least two multiple transmit / receive points and several UEs. The multiple transmission / reception points can be a base station (BS) or a macrocell (hereafter referred to as "eNB") and at least one RRH that is connected to the eNB via an optical cable or optical fiber, controlled in a wired manner and having high transmission power or low transmission power in a macrocell area. Hereafter, DL indicates communication or a communication path from multiple transmit / receive points to a UE, and UL indicates communication or a communication path from the UE to multiple transmit / receive points. In DL, a transmitter can be part of multiple transmit / receive points, and a receiver can be part of the UE. In UL, a transmitter can be part of the UE, and a receiver can be part of multiple transmit / receive points. From now on, the transmission and reception of a signal through PUCCH, PUSCH, PDCCH, EPDCCH or PDSCH may be described as the transmission and reception of PUCCH, PUSCH, PDCCH, EPDCCH or PDSCH. Furthermore, a description of the transmission or reception of a PDCCH or a description of the transmission or reception of a signal through a PDCCH may be used as meaning that it includes the transmission or reception of an EPDCCH / MPDCCH or the transmission or reception of a signal through the EPDCCH / MPDCCH. That is, a physical DL control channel described below can mean the PDCCH or the EPDCCH, or it is also used as meaning that it includes both the PDCCH and the EPDCCH / MPDCCH. Furthermore, for convenience of description, EPDCCH / MPDCCH may be applied to an embodiment that includes PDCCH, as an embodiment of the present description, and PDCCH may also be applied to an embodiment that includes EPDCCH / MPDCCH as an embodiment of the present disclosure. At the same time, the upper-layer signaling described below includes Radio Resource Control (RRC) signaling, which transmits RRC information containing an RRC parameter. The base station performs DL transmission to the UEs. The base station can transmit a physical DL shared channel (PDSCH), which is a primary physical channel for unicast transmission, and a physical DL control channel (PDCCH) to transmit i) DL control information, such as the programming required to receive the PDSCH, and ii) programming approval information for transmission over a UL data channel (e.g., a physical UL shared channel (PUSCH)). Hereafter, the transmission / reception of a signal over each channel can be described as transmitting / receiving a corresponding channel. New 5G radio (NR) Recently, 3GPP approved the "Study on New Radio Access Technology," a study topic for research on next-generation / 5G radio access technology. Based on this study, analyses have begun on frame structures, channel coding and modulation, waveforms, multiple access schemes, and similar aspects of 5G. It is necessary to design the NR not only to provide improved data transmission speeds compared to Long-Term Evolution (LTE) / LTE-Advanced, but also to meet various requirements in detailed and specific use cases. In particular, Enhanced Mobile Broadband (eMBB), Mass Machine-like Communication (mMTC), and Ultra-Reliable Low-Latency Communication (URLLC) are proposed as representative use cases for the NR. To meet the requirements of these individual scenarios, the NR must be designed with more flexible frame structures compared to LTE / LTE-Advanced. Specifically, 3GPP considers eMBB, mMTC, and URLLC to be representative NR use cases. Each use case imposes different requirements for data rate, latency, coverage, etc. Consequently, the possibility of efficiently multiplexing a radio resource unit based on different numerologies (e.g., subcarrier spacing (SCS), subframe, transmission time interval (TTI), etc.) has been analyzed as a method to meet the requirements of each use case across a frequency band of an NR system. To meet the requirements, we have also analyzed i) a method for multiplexing at least one numerology, each with different subcarrier separation values ​​with respect to another on an NR carrier using the TDM, FDM or TDM / FDM technique, and ii) a method for supporting one or more time units in the configuration of a programming unit in the time domain. In this sense, in the NR, a subframe has been defined as a type of structure in the time domain. A single subframe duration that has 14 OFDM symbols of a normal CP overload based on the 15 kHz subcarrier spacing (SCS), such as LTE, has been defined as a reference numerology for defining the subframe duration. Therefore, the NR subframe has a time duration of 1 ms. However, unlike LTE, since the NR subframe is an absolute reference time duration, a slot and a mini-slot can be defined as a time unit used for actual UL / DL data scheduling. In this case, the number of OFDM symbols that form a slot, a value of y, has been defined as y = 14 independently of numerology. Therefore, a slot can consist of 14 symbols. Furthermore, depending on the transmission direction of the slot, all symbols can be used for DL ​​transmission or UL transmission, or the symbols can be used in a configuration of one DL part + one space + one UL part. Furthermore, a mini-slot, consisting of fewer symbols than a typical slot, has been defined in a numerology (or SCS). Therefore, a short programming interval in the time domain for UL / DL data transmission / reception can be established based on the mini-slot. Additionally, a longer programming interval in the time domain for UL / DL data transmission / reception can be established by aggregating slots. In particular, as in URLLC, when transmitting or receiving latency-critical data, it can be difficult to meet latency requirements when scheduling is based on a 1 ms slot unit defined in a frame structure based on a numerology with a small SCS value, for example, 15 kHz. To address this, a mini-slot can be defined, consisting of fewer orthogonal frequency division multiple symbols than the typical slot. Therefore, scheduling can be configured so that latency-critical data, as in URLLC, is processed using this mini-slot. In addition, methods have been analyzed for scheduling data according to latency requirements based on the length of a slot (or a mini-slot) defined in each numerology, by multiplexing and supporting numerologies, each with different SCS values ​​from the other on an NR carrier, using the TDM or FDM technique, as described above. For example, since the symbol length for a 60 kHz SCS, as shown in FIG.1, is shortened to about a quarter of that of the 15 kHz SCS, when a slot is made up of seven OFDM symbols in both cases, the slot length based on the 15 kHz SCS is 0.5 ms, while the slot length based on the 60 kHz SCS is shortened to about 0.125 ms. As described above, methods for satisfying each URLLC and eMBB requirement have been exposed by defining different SCS or different TTI lengths in the NR. Temporal relationship between control information and data In NR, as a method for determining the HARQ ACK / NACK feedback timing for receiving DL data from a UE, the feedback timing is considered to be i) dynamically configured by L1 signaling (e.g., DL control information (DCI)), ii) semi-statically configured by the upper layer, or iii) configured in combination by the upper layer and dynamic L1 signaling. Furthermore, as a method for determining the timing between UL allocation and the corresponding UL data transmission, the timing is also considered to be i) dynamically configured by L1 signaling (e.g., DCI), ii) semi-statically configured by the upper layer, or iii) configured in combination with dynamic L1 and upper layer signaling. Furthermore, the timing between DL allocation and the corresponding DL data reception can be considered to be i) dynamically configured by L1 signaling (e.g., DCI), ii) semi-statically configured by the upper layer, or iii) configured in combination with the upper layer and dynamic L1 signaling. In accordance with the realizations in this disclosure, a method is provided for configuring DL control information to support a method for multiplexing and transmitting / receiving URLLC data based on a short TTI length and eMBB data based on a long TTI length on a given frequency resource using the TDM technique. In a typical LTE / LTE-A system, the allocation of an UL / DL data resource is performed on a resource block (RB) basis along the frequency axis and on a subframe basis along the time axis. Specifically, in the LTE / LTE-A system, to allocate a resource to a DL data channel (PDSCH), the PDSCH transmit resource allocation information is transmitted using the corresponding DL allocation DCI within the same subframe. The large UL DCI indicates the PUSCH transmit resource allocation information of a UL subframe after four subframes. Therefore, in a DL subframe, a UE has performed DL data receive operations across all OFDM symbols except in a control region for PDCCH transmission. In a UL subframe, the UE has transmitted UL data across all SC-FDMA symbols of the UL subframe, or all SC-FDMA symbols except the last symbol if an SRS is configured. As described earlier, in NR, a slot can be defined as a time-domain (TTI) scheduling unit in a frame structure based on an SCS value. Furthermore, the allocation of resources to latency-sensitive URLLC data can be performed based on a unit of a mini-slot or a unit of a slot based on a larger SCS. To this end, it is possible to configure separately, within the frequency band, a resource block (RB) of the NR to allocate a resource based on a short time-domain (TTI) programming unit, such as a slot based on a larger SCS, or a mini-slot based on a smaller SCS, and another RB of the NR to allocate a resource based on a long time-domain (TTI) programming unit, such as a slot based on a smaller SCS. However, as shown in Figure 2, it is possible to perform multiplexing and transmission / reception of each of the URLLC data and the eMBB data in each time-domain (TTI) programming unit using the TDM technique in the same frequency band and RB. Consequently, it is possible to increase the efficiency of resource utilization for multiplexing based on the frequency-axis FDM technique. In this case, it is necessary that the resource allocation information based on a symbol or group of symbols be additionally indicated in a scheduling unit for an NR UE in which a time-domain scheduling unit (or TTI) is defined that has a longer time interval, such as the eMBB or mMTC. Accordingly, in accordance with the realizations of this disclosure, as a method for allocating a resource to an UL / DL data channel (e.g., NR PDSCH or NR PUSCH) for a UE, i) the frequency resource (RB) allocation information and ii) the OFDM symbol allocation information on the basis of an OFDM symbol or group of symbols that configures a time-domain scheduling unit (TTI) established for the UE may be included in the DL control information to transmit the scheduling control information for the UL / DL data channel. In accordance with realizations 1 and 2, the basic concept for time-domain resource allocation using OFDM symbol allocation information will be analyzed below, based on an OFDM symbol unit or a group of symbols that constitute a time-domain scheduling unit (TTI) established for a UE. Subsequently, the methods of a UE and a base station for allocating the time-domain resource will be analyzed. Implementation 1. Symbol-based assignment As a method for configuring symbol assignment information in UL / DL data via DL control information, it is possible to configure bitmap-based symbol assignment information for all symbols comprising a set of TTIs for a UE. The configured information can then be included in the UL / DL data assignment control information. For example, for an NR UE in which a time domain programming unit (or TTI) is set as a single-slot unit consisting of 14 symbols based on a 15 kHz SCS, when configuring DL control information to transmit UL / DL data programming control information for the NR UE, the control information may include a symbol allocation information area that includes a 14-bit bitmap. In this case, each bitmap configuration piece of information, which forms 14-bit bits, is mapped 1:1 across 14 symbols in the slot formed by the TTI. Based on this configuration information, a base station and the UE can further configure / obtain symbol mapping information for use in data transmission / reception in a slot allocated for each UL / DL data transmission / reception. Alternatively, as another method for configuring symbol mapping information in UL / DL data via DL control information, bitmaps for all symbols formed by a set of TTIs for a UE can be generated based on a unit from a group of symbols. The resulting bitmap can then be included in the UL / DL data mapping DL control information. At this time, a symbol size mapped to each bit that makes up the bitmap can be determined by a slot size based on i) a mini-slot defined for latency-sensitive data, such as the URLLC in a TTI, or ii) a longer SCS. For example, for an NR UE in which a TTI is set as a one-slot unit consisting of 14 symbols based on 15 kHz, in the case that 6 mini-slots consisting of (2 symbols, 2 symbols, 3 symbols, 2 symbols, 3 symbols) are defined in a symbol to support a short TTI for latency-sensitive data such as URLLC, in a corresponding cell, when configuring the UL / DL data programming control information for the NR UE, for control information, you can include a symbol assignment information area that includes a 6-bit bitmap. In this case, each bitmap configuration information that forms 6-bit bits is assigned 1:1 in a group of symbols that form 3 mini-slots (e.g., the mini-slot formed by the 2 or 3 symbols) defined in the slot, and according to the configuration information, a base station and the UE can additionally configure / obtain symbol allocation information for use in data transmission / reception in a slot allocated for each UL / DL data transmission / reception.In this case, the size of the symbol group used as the symbol allocation unit (e.g., the number of symbols in a symbol group) and the number of symbol groups (a corresponding bitmap size) can be determined by i) the size of a set of TTIs for the UE and ii) the size of a short TTI formed in the TTI (the size of a mini-slot corresponding to the short TTI, e.g., 2 or 3 symbols in the previous example) and the number of short TTIs (6 TTIs in the previous example). In this respect, a predefined value can be set according to a cell-supported SCS value and a corresponding SCS value and TTI size used in a UE, or the configuration can be performed by a base station via cell / UE-specific high-layer signaling.As another method for configuring symbol assignment information in UL / DL data via DL control information, a symbol assignment candidate table can be created for all symbols comprising a set of TTIs for a UE. A base station can then include and transmit symbol assignment index indication information based on this DL control information table. For example, for an NR UE in which a TTI is set based on a single-slot unit consisting of 14 symbols based on 15 kHz, a symbol assignment candidate table can be formed as in Table 1 below. [Table 1] It is possible to configure / obtain symbol assignment information that will actually be used for UL / DL data transmission / reception for the UE among 14 symbols from #0 to #13 formed by a TTI defined for a UE. It is noted that the symbol allocation table can be predefined with an SCS value or TTI size supported by a corresponding cell, or configured by a base station through cell / UE-specific RRC signaling. As another example, each OFDM symbol (or SC-FDMA symbol) assignment piece and the indexes indicating the symbol assignment information for each UE can be included in tabular form, as shown in Table 2. In this method, each OFDM symbol (or SC-FDMA symbol) assignment piece can include the respective initial OFDM symbols (or SC-FDMA symbols) and lengths. Hereafter, an OFDM symbol can be used to represent a single, encompassing SC-FDMA symbol. [Table 2] That symbol assignment candidate table includes OFDM symbol assignment information (or SC-FDMA symbols) and related indexes for each UE, as shown in Table 2, meaning that a base station or UE maps and stores OFDM symbol assignment information (or SC-FDMA symbols) in the indexes. A symbol assignment candidate table can be formed for all symbols comprising a set of TTIs for a UE. For example, for an NR UE where a TTI is set based on a one-slot unit consisting of 14 symbols based on 15 kHz, as described above, a symbol assignment candidate table can be formed as shown in Table 1 or 2. Note that the symbol assignment table can be predefined with an SCS value or a TTI size supported by a corresponding cell, or configured by a base station via cell / UE-specific RRC signaling. For example, the base station can transmit symbol assignment information in the form of a table for transmitting / receiving the UL / DL data channel to the UE via UE-specific RRC signaling. The UE can receive symbol assignment information in the form of a table for transmitting / receiving the UL / DL data channel from the base station via UE-specific high-layer signaling, such as RRC signaling. Furthermore, when forming the symbol allocation table, a separate symbol allocation table can be defined for a DL data channel (e.g., a PDSCH) and a separate symbol allocation table for an UL data channel (e.g., a PUSCH), or a base station can form the symbol allocation table and transmit the formed table to each UE via UE-specific high-layer signaling, such as RRC signaling for each UE. Therefore, if the symbol allocation table is formed as shown in Table 1 or 2, as described above, a base station can include index indication information based on a PDSCH symbol allocation table formed for a UE in a DL allocation DCI. Thus, the base station can indicate OFDM symbol resource allocation information for the PDSCH to the UE. Similarly, the base station can include index indication information based on a PUSCH symbol allocation table formed for the UE in the UL grant DCI. The base station can indicate OFDM symbol resource allocation information for the PUSCH to the UE. Implementation 2. Configuring the symbol-level assignment Furthermore, the symbol assignment described in Realization 1 can be configured by a base station via cell / UE-specific RRC signaling. Therefore, in the event that symbol-level assignment is configured by cell / UE-specific RRC signaling (e.g., enabled), the symbol assignment information area may be included in the DL assignment control information and / or the UL assignment DL control information for an NR UE. Conversely, if symbol-level assignment is not configured by cell / UE-specific RRC signaling (e.g., disabled), the symbol assignment information area may not be included in the DL assignment control information and / or the UL assignment DL control information for an NR UE. As another example, the symbol assignment described in Realization 1 can be implicitly enabled or disabled according to an SCS value and TTI length defined for a UE. For example, for an NE UE that operates based on an SCS value smaller than a specified threshold value, in the event that a TTI length set for the UE is greater than a default value, the symbol assignment information area may be included in the DL assignment control information and / or the UL assignment control information for the UE. Conversely, if an NE UE operates based on an SCS value less than a specific threshold value and a TTI length set for the UE is less than a default value, or an NE UE operates based on an SCS value greater than the default value, the symbol assignment information area may not be included in the DL assignment control information and / or the UL assignment control information for the UE. FIG. 3 is a flowchart illustrating a method of a base station allocating a time-domain resource for DL ​​data channel (PDSCH) transmission / reception or UL data channel (PUSCH) transmission / reception in accordance with the realizations of this disclosure. Referring to FIG. 3, a base station method 300 can be provided for allocating a time-domain resource for DL ​​data channel (PDSCH) transmission / reception or UL data channel (PUSCH) transmission / reception according to at least one example. Method 300 includes allocating the time-domain resource based on a slot or mini-slot as a unit of one OFDM symbol (or SC-FDMA symbol) and, at the same time, transmitting to a UE time-domain resource configuration information that includes OFDM symbol (or SC-FDMA symbol) allocation information for the OFDM symbols (or SC-FDMA symbols) used for data channel transmission / reception in the slot or mini-slot, and transmitting to the UE control information that selects one of the symbol allocation information included in the time-domain resource configuration information. To allocate the time-domain resource for DL ​​data channel (PDSCH) transmission / reception, the time-domain resource configuration information can include, in the form of a table as shown in Table 2, OFDM symbol allocation information and indices indicating each of the symbol allocation details for each UE. The OFDM symbol allocation information for DL ​​data channel (PDSCH) transmission / reception can include one or more initial OFDM symbols and one or more lengths. In this case, the time-domain resource configuration information includes OFDM symbol assignment information and indexes for each UE in tabular form, as shown in Table 2. This means that a base station or a UE maps and stores the OFDM symbol assignment information in the indexes. Alternatively, it can mean that the OFDM symbol assignment information and indexes are included in the data and / or control information or in a signal and then transmitted / received to / from other transmit / receive entities. A symbol assignment candidate table can be formed for all symbols comprising a set of TTIs for a UE. For example, for an NR UE where a TTI is set as a one-slot unit consisting of 14 symbols based on 15 kHz, as described above, a symbol assignment candidate table can be formed as shown in Table 1 or 2. Note that the symbol assignment table can be predefined with an SCS value or a TTI size supported by a corresponding cell, or configured by a base station via cell / UE-specific RRC signaling. FIG.4 is a diagram illustrating a UE-specific upper-layer signaling information sequence that includes time-domain resource configuration information in the form of a table for transmitting / receiving the DL data channel (PDSCH) as shown in FIG.3. In the S310 stage of transmitting time-domain resource configuration information to a UE, a base station can transmit to the UE the time-domain resource configuration information 400 in the form of a table to transmit / receive a DL data channel (PDSCH) through UE-specific high-layer signaling, such as RRC signaling, as shown in FIG. 4. The base station can configure resource configuration information in the PDSCH time domain in the form of a table as shown in Table 1 or 2, and transmit the configured information to the UE via RRC signaling.When configuring the PDSCH time-domain resource configuration information in tabular form, as shown in Table 1 or 2, and transmitting the configured information to the UE via RRC signaling, the base station can include, in the PDSCH time-domain resource configuration information, i) an information area (e.g., an information area consisting of 3 bits to indicate indices 0 to 7 in the case of Table 1), or consisting of 4 bits to indicate indices 0 to 15 in the case of Table 2) to indicate each index that forms the symbol assignment table and ii) OFDM symbol assignment information corresponding to each index, which is assigned to a specific value.Therefore, the base station can transmit to the UE the PDSCH time-domain resource configuration information, which includes the information area and OFDM symbol allocation information mapped to the specified value, via an RRC message (e.g., a PDSCH time-domain resource configuration message). As another example, the base station and the UE can predefine time-domain resource configuration information in the form of a table for PDSCH transmission, as shown in Table 1 or 2. The base station can then transmit the table's input information for use in PDSCH symbol allocation to the UE via RRC signaling. For example, if the PDSCH time-domain resource configuration information in table form, as shown in Table 2, is predefined at a base station and a UE, the base station can transmit input-related information for use by the UE from the PDSCH time-domain resource configuration information via RRC signaling.That is, the base station can configure index information for use in the UE's PDSCH symbol allocation between indexes 0 to 15 in Table 2 (for example, an index value to use or information related to the indexing interval to use) and transmit the configured information to the UE via an RRC message (for example, a PDSCH time-domain resource configuration message). In the S320 stage of transmitting control information to the UE, the base station can transmit control information that includes information indicating one of the indices. FIG. 5 is a diagram illustrating a portion of a DL assignment DCI format as shown in FIG. 3. Referring to FIG. 5, the control information can be the DL allocation DL control information 500 (DL allocation DCI). In the S320 stage of transmitting control information to a UE, a base station can transmit the DL allocation DL control information 500, which includes information indicating one of the indices, to the UE via a DL control channel (PDCCH). Specifically, the DL 500 assignment control information illustrated in FIG.5 may include a field representing information indicating one of the indexes, such as a Symbol Assignment Field (SAF) 510. The SAF 510 field can represent one of the indices included in the time-domain resource configuration information (400) transmitted via RRC signaling. For example, if all the time-domain resource configuration information in Table 2 is transmitted via high-layer signaling, the SAF 410 field can represent, with 4 bits, all the OFDM symbol allocation information in Table 2. As another example, in case a portion of the time-domain resource configuration information in Table 2, such as indices 0 to 7, is transmitted via high-layer signaling, the SAF 410 field can represent OFDM symbol allocation information with 3 bits. To allocate the time-domain resource for UL (PUSCH) data channel transmission / reception, the time-domain resource configuration information may include, in tabular form, OFDM symbol (or SC-FDMA symbol) allocation information and indices indicating each symbol allocation information for each UE. The OFDM (or SC-FDMA symbol) allocation information for UL (PUSCH) data channel transmission / reception may include one or more initial OFDM (or SC-FDMA) symbols and one or more lengths. In the S310 stage of transmitting time-domain resource configuration information to the UE, the base station can transmit time-domain resource configuration information to the UE in the form of a table for UL data channel transmission / reception (PUSH) via UE-specific high-layer signaling. A symbol assignment candidate table can be formed for all symbols comprising a set of TTIs for the UE. For example, for an NR UE where a TTI is set as a one-slot unit consisting of 14 symbols based on 15 kHz, as described above, a symbol assignment candidate table can be formed as shown in Table 2. Note that the symbol assignment table can be predefined with an SCS value or a TTI size supported by a corresponding cell, or configured by a base station through cell / UE-specific RRC signaling. FIG.6 shows a UE-specific upper-layer signaling information sequence that includes time-domain resource configuration information in the form of a table for UL data channel transmission / reception (PUSCH) as in FIG.3. In the S310 stage of transmitting time-domain resource configuration information to a UE, a base station can transmit the time-domain resource configuration information 600 to the UE in the form of a table for UL data channel transmission / reception (PUSCH) via UE-specific high-layer signaling, such as RRC signaling, as shown in FIG. 6. As described above, the base station can configure the PUSCH time-domain resource configuration information in the form of a table as shown in Table 1 or 2, and transmit the configured information to the UE via RRC signaling.By configuring PUSCH time-domain resource configuration information in the form of a table as shown in Table 1 or 2 and transmitting the configured information to the UE via RRC signaling, the base station can include, in the PUSCH time-domain resource configuration information, i) an information area (for example, an information area consisting of 3 bits to indicate indices 0 to 7 in the case of Table 1, or 4 bits to indicate indices 0 to 15 in the case of Table 2) to indicate each index that forms the symbol assignment table and ii) OFDM symbol assignment information corresponding to each index, which is assigned to a specific value.Therefore, the base station can transmit the PDSCH time-domain resource configuration information to the UE, including the information area and OFDM symbol allocation information mapped to the specific value, via an RRC message (e.g., a PUSCH time-domain resource configuration message). As another example, the base station and the UE can predefine the time-domain resource configuration information in the form of a table for PUSCH transmission, as shown in Table 1 or 2, and the base station can transmit the table input information to the UE for use in PUSCH symbol allocation via RRC signaling.For example, if PUSCH time-domain resource configuration information, in the form of a table as shown in Table 2, is predefined in a base station and a UE, the base station can transmit input-related information for use in the UE via RRC signaling. That is, the base station can configure index information for use in the UE's PUSCH symbol allocation between indices 0 to 15 in Table 2 (for example, an index value to use or information related to the index range to use) and transmit the configured information to the UE via an RRC message (for example, a PUSCH time-domain resource configuration message). In the S320 stage of transmitting control information to the UE, the base station can transmit control information that includes information indicating one of the indices. Figure 7 is a diagram illustrating part of a UL Grant DCI format, as in Figure 3. Referring to Figure 7, the control information can be the UL Grant DL Control Information 700 (UL Grant DCI). In the S320 stage of transmitting control information to a UE, the base station can transmit the UL Grant DL Control Information 700, which includes information indicating one of the indices, to the UE via a DL Control Channel (PDCCH). Specifically, the UL grant DL control 700 information illustrated in FIG. 7 may include a field representing information indicating one of the indexes, such as a Symbol Assignment Field (SAF) 710. The SAF 710 field can represent one of the indices of the time-domain resource configuration information transmitted via RRC signaling. For example, if all the time-domain resource configuration information in Table 2 is transmitted via high-layer signaling, the SAF 710 field can represent, with 4 bits, all the OFDM symbol allocation information in Table 2. As another example, in case a portion of the time-domain resource configuration information in Table 2, such as indices 0 to 7, is transmitted via high-layer signaling, the SAF 710 field can represent OFDM symbol allocation information with 3 bits. FIG. 8 is a flowchart illustrating a method of a base station allocating a time-domain resource for DL ​​data channel (PDSCH) or UL data channel (PUSCH) transmission / reception in accordance with another embodiment of this disclosure. Referring to FIG. 8, a UE method 800 can be provided to allocate a time-domain resource for transmitting / receiving the DL data channel (PDSCH) or the UL data channel (PUSCH), according to another example. For instance, method 800 includes allocating the time-domain resource based on a slot or mini-slot as a unit of one OFDM symbol and, simultaneously, receiving time-domain resource configuration information, S810, including OFDM symbol allocation information for transmitting / receiving data channels in the slot or mini-slot, and receiving, S820, control information from a base station to select one of the symbol allocation pieces included in the slot or mini-slot. To allocate the time-domain resource for DL ​​data channel (PDSCH) transmission / reception, the time-domain resource configuration information may include, in tabular form, OFDM symbol allocation information and indices indicating each symbol allocation information for each UE. The OFDM symbol allocation information for DL ​​data channel (PDSCH) transmission / reception may include starting one or more OFDM symbols and one or more lengths. In the S810 stage of receiving time-domain resource configuration information from the base station, the base station can transmit to the UE time-domain resource configuration information in the form of a table for DL ​​data channel transmission / reception (PDSCH) via UE-specific high-layer signaling. The UE can receive, from the base station, time-domain resource configuration information in the form of a table for the transmission / reception of the DL data channel (PDSCH) via UE-specific high-layer signaling, such as RRC signaling, as shown in FIG. 4. The UE can receive, from the base station, PDSCH time-domain resource configuration information in the form of a table, as shown in Table 1 or 2, via RRC signaling.In the event that the UE receives PDSCH time-domain resource configuration information in the form of a table as shown in Table 1 or 2 from a base station, the PDSCH time-domain resource configuration information may include an information area (for example, an information area consisting of 3 bits to indicate indices 0 to 7 in the case of Table 1, or consisting of 4 bits to indicate indices 0 to 15 in the case of Table 2) to indicate each index that forms the table and also includes OFDM symbol assignment information corresponding to each index, which is correlated to a specific value.Therefore, the UE can receive PDSCH time-domain resource configuration information, including the information area and OFDM symbol assignment information mapped to the specific value from the base station via an RRC message (e.g., a PDSCH time-domain resource configuration message). As another example, a base station and a UE can predefine time-domain resource configuration information in the form of a table for PDSCH transmission, as shown in Table 1 or 2. The UE can then receive information related to the table entry for use in PDSCH reception from the base station via RRC signaling. For example, if the PDSCH time-domain resource configuration information in the form of a table, as shown in Table 2, is predefined at a base station and a UE, the UE can receive information related to the entry for use from the PDSCH time-domain resource configuration information via RRC signaling.That is, you can set the index information to be used for receiving PUSCH symbol allocation information from the UE between indexes 0 to 15 in Table 2 (for example, an index value to use or information related to the index range to use), and the UE can receive the configured information from the base station via an RRC message (for example, a PUSCH time-domain resource configuration message). In the S820 stage of receiving control information from the base station, the UE can receive control information that includes information indicating one of the indices. The control information may be the DL allocation control information 500. In the S820 stage of receiving control information from the base station, the UE may receive the DL allocation control information 500 which includes information indicating one of the base station indices through a DL control channel (PDCCH). Specifically, the DL assignment control 500 information shown in FIG. 5 may include a field representing information indicating one of the indexes, such as a Symbol Assignment Field (SAF) 510 field. The SAF 510 field may represent one of the indices included in the time-domain resource configuration information 400 transmitted through high-layer signaling. To allocate the time-domain resource for UL data channel (PUSCH) transmission / reception, the time-domain resource configuration information may include, in tabular form, OFDM symbol (or SC-FDMA symbol) allocation information and indices indicating each symbol allocation information for each UE. The OFDM (or SC-FDMA symbol) allocation information for UL data channel (PUSCH) transmission / reception may include one or more initial OFDM (or SC-FDMA) symbols and one or more lengths. In the S810 stage of receiving time-domain resource configuration information from the base station, the base station can transmit to the UE the 600 time-domain resource configuration information in the form of a table for UL data channel transmission / reception (PUSH) through UE-specific high-layer signaling. The UE can receive PUSCH time-domain resource configuration information from the base station in the form of a table, as shown in Table 1 or 2, via RRC signaling. If the UE receives PUSCH time-domain resource configuration information in the form of a table, as shown in Table 1 or 2, from a base station, the PUSCH time-domain resource configuration information may include an information area (for example, an information area consisting of 3 bits to indicate indices 0 to 7 in the case of Table 1, or consisting of 4 bits to indicate indices 0 to 15 in the case of Table 2) to indicate each index in the table. It also includes OFDM symbol assignment information corresponding to each index, which is assigned a specific value.Therefore, the UE can receive PUSCH time-domain resource configuration information, including the information area and OFDM symbol allocation information mapped to the specific value from the base station via an RRC message (e.g., a PUSCH time-domain resource configuration message). As another example, a base station and a UE can predefine time-domain resource configuration information in the form of a table for PUSCH transmission, as shown in Table 1 or 2. The UE can then receive information related to the table entry for use in PUSCH transmission from the base station via RRC signaling. For example, if PUSCH time-domain resource configuration information in the form of a table, as shown in Table 2, is predefined at a base station and a UE, the UE can receive information related to the entry for use from the PUSCH time-domain resource configuration information via RRC signaling.That is, you can configure the index information to be used for receiving PUSCH symbol allocation information from the UE between indexes 0 to 15 in Table 2 (for example, an index value to use or information related to the index range to use), and the UE can receive the configured information from the base station via an RRC message (for example, a PUSCH time-domain resource configuration message). In the S810 stage of receiving control information from the base station, the base station can transmit control information that includes information indicating one of the indices to the UE. The control information may be UL concession DL control information. In the S810 stage of receiving control information from the base station, the base station may transmit the UL concession DL control information, including information indicating one of the indices, to the UE via a DL control channel. Specifically, the UL Grant DL Control 700 information shown in FIG. 7 may include a field representing information indicating one of the indices, such as a Symbol Assignment Field (SAF) 710. The SAF 710 field may represent one of the indices included in the time-domain resource configuration information transmitted through the high-layer signaling. FIG. 9 is a block diagram illustrating a 900 base station in accordance with the realizations in this disclosure. Referring to FIG. 9, a 900 base station according to another embodiment includes a 910 controller, a 920 transmitter, and a 930 receiver. Controller 910 is configured to control the general operations of the base station to configure symbol assignment information to allocate a data resource in the NR in accordance with the realizations described above in this disclosure. Controller 910 is also configured to control the general operations of base station 900 to allocate a time-domain resource for transmitting / receiving the DL data channel (PDSCH) or the UL data channel (PUSCH) as described in Figures 3 through 7. Transmitter 920 and receiver 930, respectively, are configured to transmit and receive signals, messages, and data necessary to carry out some realizations, as described above, to and from the UE. That is, the transmitter 920 and receiver 930 can be used to transmit / receive signals, messages and the like necessary to carry out a base station method for allocating the time domain resource for transmission / reception of the DL data channel (PDSCH) or the UL data channel (PUSCH) exposed with reference to FIGS.3 to 7. Figure 10 is a block diagram illustrating a UE according to the embodiments of this disclosure. Referring to Figure 10, a UE 1000 according to another embodiment includes a receiver 1010, a controller 1020, and a transmitter 1030. The 1010 receiver receives DL control information, data, and messages from a base station via a corresponding channel. Controller 1020 is configured to control the general operations of UE 1000 to obtain symbol assignment information from DL control information in the NR in accordance with the realizations of this disclosure described above. Controller 1010 is configured to control the general operations of UE 1000 to allocate a time domain resource for DL ​​data channel (PDSCH) or UL data channel (PUSCH) transmission / reception exposed with reference to FIGS.3 to 7. The 1030 transmitter is configured to transmit UL information, data, and control messages to a base station via a corresponding channel. That is, transmitter 1020 and receiver 1030 can be used to transmit / receive signals, messages and the like necessary to carry out a base station / UE method for allocating the time domain resource for transmission / reception of the DL data channel (PDSCH) or the UL data channel (PUSCH) exposed with reference to FIGS.3 to 7. The standardized specifications or standard documents relating to the embodiments described above form part of this disclosure. Accordingly, the incorporation of the content of the standardized specifications and part of the standard documents into the detailed description and claims should be understood to be within the scope of this disclosure. The scope of protection of the invention is limited by the attached claims. Cross-reference to related request If applicable, this application claims priority under 35 USC §119(a) of patent application no. 10-2016-0143013, filed on October 31, 2016, and patent application no. 10-2017-0140898, filed on October 27, 2017 in Korea.

Claims

1. A method of operating a wireless device, the method comprising: receiving, by means of the wireless device, downlink control information (DCI), which includes time-domain resource allocation information; receiving, by means of the wireless device, a shared downlink physical channel (PDSCH), or transmitting, by means of the wireless device, a shared uplink physical channel (PUSCH), based on an initial orthogonal frequency-division multiplexing (OFDM) symbol and a number of OFDM symbols counting from the initial OFDM symbol in a slot, after receiving the DCI, wherein the time-domain resource allocation information included in the DCI refers to row index information in an allocation table, and wherein the initial OFDM symbol and the number of OFDM symbols are identified based on the row index information in the allocation table. 2.The method of claim 1, wherein the time-domain resource allocation information included in the DCI is represented by 3 bits.

3. The method of claim 1, wherein the DCI further includes frequency-domain resource allocation information.

4. The method of claim 1, wherein the DCI is received through a physical downlink control channel, PDCCH.

5. The method according to claim 1, further comprising: receiving, by means of the wireless device, a radio resource control signal, RRC, in association with the time-domain resource allocation information. 6.A wireless device comprising: a memory; and a processor operatively coupled to the memory, wherein the processor is configured to: cause the wireless device to receive downlink control information (DCI), which includes time-domain resource allocation information; receive a downlink physical shared channel (PDSCH), or transmit an uplink physical shared channel (PUSCH), based on an initial orthogonal frequency-division multiplexing (OFDM) symbol and a number of OFDM symbols counting from the initial OFDM symbol in a slot, after receiving the DCI, wherein the time-domain resource allocation information included in the DCI refers to row index information in an allocation table, and wherein the initial OFDM symbol and the number of OFDM symbols are identified based on the row index information in the allocation table. 7.The wireless device of claim 6, wherein the time-domain resource allocation information included in the DCI is represented by 3 bits.

8. The wireless device of claim 6, wherein the DCI further includes frequency-domain resource allocation information.

9. The wireless device of claim 6, wherein the DCI is received through a physical downlink control channel, PDCCH.

10. The wireless device of claim 6, wherein the operations further include: receiving a radio resource control signal, RRC, in association with the time-domain resource allocation information. 11.A base station, comprising: a memory; and a processor operatively coupled to the memory; wherein the processor is configured to: cause the base station to transmit downlink control information, DCI, which includes time-domain resource allocation information; and transmit a shared downlink physical channel, PDSCH, or receive a shared uplink physical channel, PUSCH, based on an initial orthogonal frequency-division multiplexing (OFDM) symbol and a number of OFDM symbols counting from the initial OFDM symbol in a slot, after transmitting the DCI, wherein the time-domain resource allocation information included in the DCI refers to row index information in an allocation table, and wherein the initial OFDM symbol and the number of OFDM symbols are identified based on the row index information in the allocation table. 12.The base station of claim 11, wherein the time-domain resource allocation information included in the DCI is represented by 3 bits.

13. The base station of claim 11, wherein the DCI further includes frequency-domain resource allocation information.

14. The base station of claim 11, wherein the DCI is transmitted over a physical downlink control channel, PDCCH.

15. The base station of claim 11, wherein the operations further include: transmitting a radio resource control signaling, RRC, in association with the time-domain resource allocation information. 16.A method of operating a base station, the method comprising: transmitting, by the base station, downlink control information (DCI), which includes time-domain resource allocation information; transmitting, by the base station, a shared downlink physical channel (PDSCH), or receiving, by the base station, a shared uplink physical channel (PUSCH), based on an initial orthogonal frequency-division multiplexing (OFDM) symbol and a number of OFDM symbols counting from the initial OFDM symbol in a slot, after transmitting the DCI, wherein the time-domain resource allocation information included in the DCI refers to row index information in an allocation table, and wherein the initial OFDM symbol and the number of OFDM symbols are identified based on the row index information in the allocation table. 17.The method of claim 16, wherein the time-domain resource allocation information included in the DCI is represented by 3 bits.

18. The method of claim 16, wherein the DCI further includes frequency-domain resource allocation information.

19. The method of claim 16, wherein the DCI is transmitted over a physical downlink control channel, PDCCH.

20. The method of claim 16, further comprising: transmitting, via the base station, a radio resource control signal, RRC, in association with the time-domain resource allocation information.

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