Method and apparatus for transmitting and receiving downlink information in a wireless communication system supporting the Internet of Things

Abstract

This specification proposes a method and apparatus for transmitting and receiving downlink information in a wireless communication system supporting the Internet of Things. The method, performed by a terminal, may include the following steps: receiving resource reservation configuration information including first information and second information from a base station, the first information including a slot-level bitmap associated with reserved resources, and the second information including a symbol-level bitmap associated with the reserved resources; receiving downlink control information (DCI) including indication information associated with the use of the reserved resources from the base station; and receiving downlink information from the base station based on the resource reservation configuration information and the indication information.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system supporting the Internet of Things (IoT) (eg, MTC, NB-IoT), and more particularly, to a method for transmitting and receiving downlink information and an apparatus thereof. Background Art

[0002] Mobile communication systems have been developed to provide voice services while ensuring user mobility. However, beyond voice, the scope of mobile communication systems has expanded to include data services. Due to the current explosive growth of services and the resulting shortage of resources, users are demanding higher-speed services. Consequently, more advanced mobile communication systems are needed.

[0003] The requirements for next-generation mobile communication systems need to be able to support and adapt to bursty data services, significantly increase the data rate per user, adapt to a significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency. To this end, various technologies such as dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband, and device networking are being studied. Summary of the Invention

[0004] Technical issues

[0005] The present disclosure provides a method and apparatus for hierarchically configuring reserved resources in a wireless communication system supporting the Internet of Things (IoT) (eg, MTC, NB-IoT).

[0006] The present disclosure also provides a method and apparatus for using reserved resources based on downlink control information (DCI).

[0007] The present disclosure also provides a method for configuring reserved resources in units of specific resources (e.g., narrowband, NB-IoT carrier).

[0008] The technical objectives to be achieved by the present disclosure are not limited to the technical objectives described above merely by way of example, and other technical objectives not mentioned can be clearly understood by those skilled in the art to which the present disclosure pertains from the following description.

[0009] Technical Solution

[0010] In one aspect of the present disclosure, a method for receiving downlink information by a user equipment (UE) in a wireless communication system supporting the Internet of Things (IoT) is provided, the method comprising: receiving resource reservation configuration information including first information and second information from a base station, the first information including a slot-level bitmap related to reserved resources, and the second information including a symbol-level bitmap related to the reserved resources; receiving downlink control information (DCI) including indication information related to the use of the reserved resources from the base station; and receiving downlink information from the base station based on the resource reservation configuration information and the indication information.

[0011] Based on the indication information including the indication related to the use of the reserved resources, the reserved resources may be used to receive the downlink information.

[0012] Based on the indication information including the indication related to reservation of the reserved resources, the downlink information is received without using the reserved resources.

[0013] The reserved resources may be one or more symbols reserved based on a symbol-level bitmap in a slot reserved based on a slot-level bitmap.

[0014] The slot level bitmap can be set in units of 10 milliseconds (ms) or 40 ms.

[0015] IoT may include machine type communication (MTC) and / or narrowband IoT (NB-IoT).

[0016] If the IoT is based on MTC, resource reservation configuration information can be configured for each narrowband. If the IoT is based on NB-IoT, resource reservation configuration information can be configured for each NB-IoT carrier.

[0017] The resource reservation configuration information may be received via radio resource control (RRC) signaling.

[0018] The downlink information may be received via a physical downlink control channel (PDCCH) and / or a physical downlink shared channel (PDSCH).

[0019] In another aspect of the present disclosure, a user equipment (UE) for receiving downlink information in a wireless communication system supporting the Internet of Things (IoT) is provided, the UE including one or more transceivers, one or more processors, and one or more memories, the one or more memories being operatively connected to the one or more processors and storing instructions for performing operations, wherein the operations include: receiving resource reservation configuration information including first information and second information from a base station, the first information including a time slot level bitmap related to reserved resources, and the second information including a symbol level bitmap related to the reserved resources; receiving downlink control information (DCI) including indication information related to the use of the reserved resources from the base station; and receiving downlink information from the base station based on the resource reservation configuration information and the indication information.

[0020] In another aspect of the present disclosure, a method for sending downlink information by a base station in a wireless communication system supporting the Internet of Things (IoT) is provided, the method comprising: sending resource reservation configuration information including first information and second information to a user equipment (UE), the first information including a time slot level bitmap related to reserved resources, and the second information including a symbol level bitmap related to the reserved resources; sending downlink control information (DCI) including indication information related to the use of the reserved resources to the UE; and sending downlink information to the UE based on the resource reservation configuration information and the indication information.

[0021] Based on the indication information including the indication related to the use of the reserved resources, the reserved resources may be used to send the downlink information.

[0022] Based on the indication information including the indication related to reservation of the reserved resources, the downlink information is transmitted without using the reserved resources.

[0023] The reserved resources may be one or more symbols reserved based on a symbol-level bitmap in a slot reserved based on a slot-level bitmap.

[0024] The slot level bitmap can be set in units of 10 milliseconds (ms) or 40 ms.

[0025] IoT may include machine type communication (MTC) and / or narrowband IoT (NB-IoT).

[0026] If the IoT is based on MTC, resource reservation configuration information can be configured for each narrowband. If the IoT is based on NB-IoT, resource reservation configuration information can be configured for each NB-IoT carrier.

[0027] In another aspect of the present disclosure, a base station for sending downlink information in a wireless communication system supporting the Internet of Things (IoT) is provided, the base station including one or more transceivers, one or more processors, and one or more memories, the one or more memories being operatively connected to the one or more processors and storing instructions for performing operations, wherein the operations include: sending resource reservation configuration information including first information and second information to a user equipment (UE), the first information including a time slot level bitmap related to reserved resources, and the second information including a symbol level bitmap related to the reserved resources; sending downlink control information (DCI) including indication information related to the use of the reserved resources to the UE; and sending downlink information to the UE based on the resource reservation configuration information and the indication information.

[0028] In another aspect of the present disclosure, a device is provided comprising one or more memories and one or more processors operatively connected to the one or more memories, wherein the one or more processors are configured to enable the device to: receive resource reservation configuration information comprising first information and second information from a base station, the first information comprising a slot-level bitmap associated with reserved resources, the second information comprising a symbol-level bitmap associated with the reserved resources; receive downlink control information (DCI) comprising indication information associated with the use of the reserved resources from the base station; and receive downlink information from the base station based on the resource reservation configuration information and the indication information.

[0029] In another aspect of the present disclosure, a non-transitory computer-readable medium (CRM) storing one or more instructions is provided, wherein the one or more instructions executable by one or more processors allow a user equipment (UE) to: receive resource reservation configuration information including first information and second information from a base station, the first information including a time slot level bitmap related to reserved resources, and the second information including a symbol level bitmap related to the reserved resources; receive downlink control information (DCI) including indication information related to the use of the reserved resources from the base station; and receive downlink information from the base station based on the resource reservation configuration information and the indication information.

[0030] Beneficial effects

[0031] The present disclosure has the effect of efficiently signaling reserved resources by hierarchically configuring the reserved resources in a wireless communication system supporting the Internet of Things (IoT) (eg, MTC, NB-IoT).

[0032] The present disclosure also has the effect of dynamically using reserved resources by using the reserved resources based on DCI.

[0033] The present disclosure also has the effect of using reserved resources in consideration of frequency band conditions by configuring reserved resources in units of specific resources (e.g., narrowband, NB-IoT carrier).

[0034] The present disclosure also has the effect of efficiently coexisting with different wireless communication systems (e.g., NR systems) in the same frequency band.

[0035] The present disclosure also has the effect of realizing a wireless communication system with low latency and high reliability.

[0036] The effects obtainable by the present disclosure are not limited to the above-mentioned effects, and ordinary technicians in the field to which the present disclosure belongs can clearly understand other technical effects not described above from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are included to provide a further understanding of the disclosure and constitute a part of the detailed description, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

[0038] Figure 1 The physical channels and general signal transmission used in the 3GPP system are illustrated.

[0039] Figure 2 The structure of a radio frame in a wireless communication system to which the present disclosure can be applied is illustrated.

[0040] Figure 3 A resource grid of one downlink time slot in a wireless communication system to which the present disclosure can be applied is illustrated.

[0041] Figure 4 The structure of a downlink subframe in a wireless communication system to which the present disclosure can be applied is illustrated.

[0042] Figure 5 The structure of an uplink subframe in a wireless communication system to which the present disclosure can be applied is illustrated.

[0043] Figure 6 An example of the overall structure of a NR system to which the method proposed in this disclosure can be applied is illustrated.

[0044] Figure 7 The relationship between uplink frames and downlink frames in a wireless communication system to which the method proposed in the present disclosure can be applied is illustrated.

[0045] Figure 8 An example of a frame structure in an NR system is illustrated.

[0046] Figure 9 An example of a resource grid supported in a wireless communication system to which the method proposed in the present disclosure can be applied is illustrated.

[0047] Figure 10 An example of a resource grid for each antenna port and parameter set to which the method proposed in this disclosure can be applied is illustrated.

[0048] Figure 11 An example of a self-contained structure to which the method proposed in this disclosure can be applied is illustrated.

[0049] Figure 12 MTC is illustrated.

[0050] Figure 13 The physical channels and general signal transmission used in MTC are illustrated.

[0051] Figure 14 Cell coverage enhancement in MTC is illustrated.

[0052] Figure 15 The signal frequency band for MTC is illustrated.

[0053] Figure 16 Scheduling in conventional LTE and MTC is illustrated.

[0054] Figure 17 This section illustrates physical channels used in NB-IoT and general signal transmission using the physical channels.

[0055] Figure 18 The frame structure when the subframe interval is 15 kHz is illustrated.

[0056] Figure 19 The frame structure when the subframe interval is 3.75 kHz is illustrated.

[0057] Figure 20 The three operating modes of NB-IoT are illustrated.

[0058] Figure 21 The layout of an in-band anchor carrier in an LTE bandwidth of 10 MHz is illustrated.

[0059] Figure 22 The transmission of NB-IoT downlink physical channels / signals in an FDD LTE system is illustrated.

[0060] Figure 23 The NPUSCH format is illustrated.

[0061] Figure 24 This section illustrates the operation when multiple carriers are configured in FDD NB-IoT.

[0062] Figure 25 is a flowchart for describing an operation method of a UE proposed in the present disclosure.

[0063] Figure 26 is a flowchart for describing an operating method of a BS proposed in the present disclosure.

[0064] Figure 27 A communication system 10 applied to the present disclosure is illustrated.

[0065] Figure 28 A wireless device that can be applied to the present disclosure is illustrated.

[0066] Figure 29 A signal processing circuit for transmitting a signal is illustrated.

[0067] Figure 30 Another example of a wireless device to which the present disclosure is applied is illustrated.

[0068] Figure 31 A portable device to which the present disclosure is applied is exemplified. DETAILED DESCRIPTION

[0069] The preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Figure 1 The detailed description disclosed above is intended to describe embodiments of the present disclosure, rather than to describe the only embodiments for carrying out the present disclosure. The following detailed description includes details to provide a complete understanding. However, those skilled in the art will appreciate that the present disclosure may be carried out without the details.

[0070] In some cases, in order to avoid obscuring the concepts of the present disclosure, known structures and devices may be omitted, or may be described in the form of block diagrams based on the core functions of each structure and device.

[0071] In the present disclosure, a base station means a terminal node of a network that directly performs communication with a terminal. In this document, specific operations described as being performed by a base station may in some cases be performed by an upper node of the base station. That is, it is clear that in a network consisting of a plurality of network nodes including a base station, various operations performed to communicate with a terminal may be performed by a base station or other network nodes other than the base station. A base station (BS) may generally be replaced by terms such as a fixed station, a node B, an evolved node B (eNB), a base transceiver system (BTS), an access point (AP), etc. In addition, a "terminal" may be fixed or mobile and may be replaced by terms such as a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), a wireless terminal (WT), a machine type communication (MTC) device, a machine to machine (M2M) device, a device to device (D2D) device, etc.

[0072] Hereinafter, downlink refers to communication from a base station to a terminal, and uplink refers to communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station.

[0073] Specific terms used in the following description are provided to help understanding of the present disclosure, and the use of the specific terms may be modified into other forms within the scope not departing from the technical spirit of the present disclosure.

[0074] The following technologies can be used for various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier FDMA (SC-FDMA), non-orthogonal multiple access (NOMA), etc. CDMA can be implemented through the radio technology Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented through radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented as radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), as part of Evolved UMTS (E-UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA), adopts OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (A) is an evolution of 3GPP LTE.

[0075] The embodiments of the present disclosure may be supported by at least one of the standard documents published by IEEE 802, 3GPP, and 3GPP2 for wireless access systems. In other words, steps or parts of the embodiments of the present disclosure that are not described in detail for the purpose of clearly illustrating the technical spirit of the present disclosure may be supported by the document. Furthermore, all terms disclosed in the document may be described by the standard document.

[0076] For clarity of description, the 3GPP LTE / LTE-A / NR system is mainly described, but the technical features of the present disclosure are not limited thereto.

[0077] Physical channels and general signaling

[0078] Figure 1This section illustrates the physical channels and general signal transmission used in 3GPP systems. In wireless communication systems, a UE receives information from a base station (BS) via a downlink (DL) and transmits information to the BS via an uplink (UL). The information transmitted and received by the BS and UE includes data and various control information. Various physical channels exist depending on the type and purpose of the information transmitted and received by the BS and UE.

[0079] When a UE is powered on or newly enters a cell, it performs an initial cell search operation (S11), such as synchronization with the base station (BS). To this end, the UE receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the BS, synchronizes with the BS, and obtains information such as the cell ID. Thereafter, the UE receives a physical broadcast channel (PBCH) from the BS and obtains intra-cell broadcast information. Furthermore, during the initial cell search, the UE receives a downlink reference signal (DL RS) to check the downlink channel status.

[0080] The UE that has completed the initial cell search receives a physical downlink control channel (PDCCH) and receives a physical downlink shared channel (PDSCH) according to information loaded on the PDCCH to obtain more specific system information (S12).

[0081] In addition, when the UE does not first access the base station or the radio resources for signal transmission, it can perform a random access procedure (RACH) on the base station (S13 to S16). To this end, the UE can transmit a specific sequence as a preamble through the physical random access channel (PRACH) (S13 and S15) and receive a response message (Random Access Response (RAR) message) to the preamble through the PDCCH and the corresponding PDSCH. In the case of a contention-based RACH, a contention resolution procedure (S16) can also be performed.

[0082] The UE that performs the above-described process may then perform PDCCH / PDSCH reception (S17) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission (S18) as a general uplink / downlink signal transmission process. Specifically, the UE may receive downlink control information (DCI) via the PDCCH. Here, the DCI may include control information such as resource allocation information for the UE, and may be formatted differently depending on the intended use.

[0083] In addition, the control information transmitted by the UE to the BS through the uplink or received by the UE from the BS may include a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. The UE may transmit control information such as CQI / PMI / RI through the PUSCH and / or the PUCCH.

[0084] LTE System Overview

[0085] Figure 2 The structure of a radio frame in a wireless communication system to which the present disclosure can be applied is illustrated.

[0086] 3GPP LTE / LTE-A supports radio frame structure type 1 applicable to frequency division duplex (FDD) and radio frame structure type 2 applicable to time division duplex (TDD).

[0087] exist Figure 2 In the time domain, the size of a radio frame is represented by a multiple of a time unit T_s = 1 / (15000*2048). Downlink and uplink transmissions are configured by radio frames with an interval of T_f = 307200*T_s = 10 ms.

[0088] Figure 2 (a) illustrates the structure of a radio frame type 1. The radio frame type 1 can be applied to both full-duplex and half-duplex FDD.

[0089] A radio frame consists of 10 subframes. One radio frame consists of 20 time slots of length T_slot = 15360 * T_s = 0.5 ms, and each time slot is assigned an index from 0 to 19. One subframe consists of two consecutive time slots in the time domain, and subframe i consists of time slot 2i and time slot 2i+1. The time required to transmit one subframe is called the transmission time interval (TTI). For example, the length of one subframe can be 1 ms, and the length of one time slot can be 0.5 ms.

[0090] In FDD, uplink and downlink transmissions are classified in the frequency domain. In full-duplex FDD, there is no restriction, while in half-duplex FDD operation, the UE cannot perform transmission and reception at the same time.

[0091] A slot includes multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. Since 3GPP LTE uses OFDMA in the downlink, an OFDM symbol is intended to represent one symbol period. An OFDM symbol may be referred to as an SC-FDMA symbol or symbol period. A resource block, which is a unit of resource allocation, includes multiple consecutive subcarriers in a slot.

[0092] A subframe may be defined as one or more time slots according to a subcarrier spacing (SCS), as shown below.

[0093] - In the case of SCS = 7.5 kHz or 15 kHz, subframe #i is defined as two 0.5 ms slots #2i and #2i+1 (i = 0 to 9).

[0094] - In the case of SCS = 1.25 kHz, subframe #i is defined as a 1 ms slot #2i.

[0095] - In the case of SCS = 15 kHz, subframe #i can be defined as six subslots as shown in Table A1.

[0096] Table 1 shows the subslot configuration in a subframe (normal CP).

[0097] [Table 1]

[0098]

[0099] Figure 2 (b) illustrates frame structure type 2.

[0100] Radio frame type 2 consists of two half-frames, each half-frame has a length of 153600*T_s=5 ms, and each half-frame consists of 5 subframes with a length of 30720*T_s=1 ms.

[0101] In the frame structure type 2 of the TDD system, the uplink-downlink configuration is a rule indicating whether uplink and downlink are assigned (or reserved) for all subframes.

[0102] The uplink-downlink configuration is shown in Table 2.

[0103] [Table 2]

[0104]

[0105] Referring to Table 2, for each subframe of a radio frame, "D" indicates a subframe for downlink transmission, "U" indicates a subframe for uplink transmission, and "S" indicates a special subframe consisting of three fields: Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS). The DwPTS is used for initial cell search, synchronization, or channel estimation in the UE. The UpPTS is used to match channel estimation at the base station with uplink transmission synchronization of the UE. The GP is a period for eliminating interference caused in the uplink due to multipath delay of the downlink signal between the uplink and downlink.

[0106] Each subframe i consists of time slot 2i and time slot 2i+1, and the length of each time slot is T_slot=15360*T_s=0.5ms.

[0107] The uplink-downlink configuration may be divided into 7 types and the positions and / or numbers of downlink subframes, special subframes, and uplink subframes for each configuration are varied.

[0108] The point at which the downlink is changed to the uplink, or the point at which the uplink is switched to the downlink, is called a switching point. The switching point periodicity means that the uplink and downlink subframes are switched, and similarly repeats, and supports both 5ms and 10ms periods. When the downlink-uplink switching point periodicity is 5ms, the special subframe S exists in every half-frame. When the downlink-uplink switching point periodicity is 5ms, the special subframe S exists only in the first half-frame.

[0109] In all configurations, subframes #0 and #5 and DwPTS are periods for downlink transmission only. UpPTS and subframe #0 and the subframe immediately following it are always periods for uplink transmission.

[0110] The uplink-downlink configuration, as system information, is known to both the base station and the UE. Whenever the configuration information changes, the base station only transmits the index of the configuration information to inform the UE of the change in the uplink-downlink assignment status of the radio frame. Furthermore, the configuration information can be transmitted as downlink control information via the Physical Downlink Control Channel (PDCCH), similar to other scheduling information, and can be sent as broadcast information to all UEs in the cell via a broadcast channel.

[0111] Table 3 shows the configuration of the special subframe (length of DwPTS / GP / UpPTS).

[0112] [Table 3]

[0113]

[0114] Here, X is configured by a higher layer (eg, RRC) signal or is given as 0.

[0115] according to Figure 2 The structure of the radio frame of the example is merely an example, and the number of subcarriers included in the radio frame or the number of slots included in the subframe, and the number of OFDM symbols included in the slot may be variously changed.

[0116] Figure 3 2 is a diagram illustrating a resource grid of one downlink slot in a wireless communication system to which the present disclosure can be applied.

[0117] Reference Figure 3 , a downlink time slot includes multiple OFDM symbols in the time domain. In this document, an example is given in which a downlink time slot includes 7 OFDM symbols and a resource block includes 12 subcarriers in the frequency domain, but the present disclosure is not limited thereto.

[0118] Each element on the resource grid is called a resource element, and one resource block includes 12×7 resource elements. The number N^DL of resource blocks included in a downlink slot depends on a downlink transmission bandwidth.

[0119] The structure of the uplink timeslot may be the same as that of the downlink timeslot.

[0120] Figure 4 The structure of a downlink subframe in a wireless communication system to which the present disclosure can be applied is illustrated.

[0121] Reference Figure 4 In the first slot of a subframe, up to the first three OFDM symbols are allocated to a control region, to which a control channel is allocated, and the remaining OFDM symbols are allocated to a data region, to which a physical downlink shared channel (PDSCH) is allocated. Examples of downlink control channels used in 3GPP LTE include the Physical Control Format Indicator Channel (PCFICH), the Physical Downlink Control Channel (PDCCH), and the Physical Hybrid ARQ Indicator Channel (PHICH).

[0122] The PFCICH is sent in the first OFDM symbol of a subframe and transmits information about the number of OFDM symbols used to send control channels in the subframe (i.e., the size of the control region). The PHICH, as a response channel for the uplink, transmits an acknowledgment (ACK) / non-acknowledgment (NACK) signal for a hybrid automatic repeat request (HARQ). The control information sent via the PDCCH is called downlink control information (DCI). The downlink control information includes uplink resource allocation information, downlink resource allocation information, or uplink transmission (Tx) power control commands for a predetermined terminal group.

[0123] The PDCCH can transmit resource allocation and transmission format (also known as downlink grant) of the downlink shared channel (DL-SCH), resource allocation information (also known as uplink grant) of the uplink shared channel (UL-SCH), paging information in the paging channel (PCH), system information in the DL-SCH, resource allocation for upper layer control messages such as random access responses sent in the PDSCH, a set of transmission power control commands for each terminal in a predetermined terminal group, and IP voice (VoIP). Multiple PDCCHs can be sent in the control region and a terminal can monitor multiple PDCCHs. The PDCCH consists of a set of one or more consecutive control channel elements (CCEs). A CCE is a logical allocation unit for providing a code rate to the PDCCH according to the state of the radio channel. A CCE corresponds to multiple resource element groups. The format of the PDCCH and the number of available PDCCH bits are determined by the association between the number of CCEs and the code rate provided by the CCEs.

[0124] The base station determines the PDCCH format according to the DCI to be sent and attaches a cyclic redundancy check (CRC) to the control information. Depending on the owner or purpose of the PDCCH, the CRC is masked with a unique identifier (called a radio network temporary identifier (RNTI)). In the case of a PDCCH for a specific terminal, the terminal's unique identifier (e.g., cell-RNTI (C-RNTI)) can be masked with the CRC. Alternatively, in the case of a PDCCH for a paging message, a paging indication identifier, for example, the CRC can be masked with a paging-RNTI (P-RNTI). In the case of a PDCCH for system information (more specifically, a system information block (SIB)), the CRC can be masked with a system information identifier (i.e., system information (SI)-RNTI). The CRC can be masked with a random access (RA)-RNTI to indicate a random access response as a response to the transmission of a random access preamble.

[0125] The enhanced PDCCH (EPDCCH) carries UE-specific signaling. The EPDCCH is located in physical resource blocks (PRBs) that are configured as UE-specific. In other words, as described above, the PDCCH can be sent in up to the first three OFDM symbols in the first time slot of a subframe, but the EPDCCH can be sent in resource areas other than the PDCCH. The time (i.e., symbol) at which the EPDCCH starts in a subframe can be configured to the UE via higher-layer signaling (e.g., RRC signaling).

[0126] EPDCCH can carry the transport format, resource allocation, and HARQ information related to DL-SCH, the transport format, resource allocation, and HARQ information related to UL-SCH, resource allocation information related to the Sidelink Shared Channel (SL-SCH) and the Physical Sidelink Control Channel (PSCCH), etc. Multiple EPDCCHs can be supported, and a UE can monitor a group of EPCCHs.

[0127] The EPDCCH may be transmitted using one or more consecutive enhanced CCEs (ECCEs), and the number of ECCEs per EPDCCH may be determined for each EPDCCH format.

[0128] Each ECCE can be composed of multiple enhanced resource element groups (EREGs). EREGs are used to define the mapping of ECCEs to REs. Each PRB pair has 16 EREGs. All REs in each PRB pair, except for REs carrying DMRS, are numbered from 0 to 15 in ascending order of frequency and then in ascending order of time.

[0129] A UE may monitor multiple EPDCCHs. For example, one or two EPDCCH sets may be configured in a pair of PRBs where the UE monitors EPDCCH transmissions.

[0130] By combining different numbers of ECCEs, different code rates can be achieved for EPCCH.EPCCH can adopt localized transmission or distributed transmission, and therefore the mapping of ECCEs to REs in PRBs can be varied.

[0131] Figure 5 The structure of an uplink subframe in a wireless communication system to which the present disclosure can be applied is illustrated.

[0132] Reference Figure 5 The uplink subframe can be divided into a control region and a data region in the frequency domain. The physical uplink control channel (PUCCH), which transmits uplink control information, is allocated to the control region. The physical uplink shared channel (PUSCH), which transmits user data, is allocated to the data region. A terminal does not transmit both the PUCCH and PUSCH simultaneously to maintain single-carrier characteristics.

[0133] A resource block (RB) pair in a subframe is allocated to a PUCCH for one terminal. The RBs included in the RB pair occupy different subcarriers in two time slots. The RB pair allocated to the PUCCH is frequency-hopped at the time slot boundary.

[0134] NR System Overview

[0135] The following disclosure proposed in this disclosure can be applied to 5G NR systems (or devices) and LTE / LTE-A systems (or devices).

[0136] Refer to the following Figures 6 to 11 Describe the communications of the 5G NR system.

[0137] The 5G NR system defines enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable and low-latency communication (URLLC), and vehicle-to-everything (V2X) based on usage scenarios (e.g., service types).

[0138] The 5G NR standard is divided into standalone (SA) and non-standalone (NSA) based on the coexistence of the NR system and the LTE system.

[0139] The 5G NR system supports various subcarrier spacings and supports CP-OFDM in the downlink and supports CP-OFDM and DFT-s-OFDM (SC-OFDM) in the uplink.

[0140] The embodiments of the present disclosure may be supported by at least one of the standard documents published by IEEE 802, 3GPP, and 3GPP2 for wireless access systems. In other words, any steps or parts not described in the embodiments of the present disclosure for the purpose of clearly illustrating the technical spirit of the present disclosure may be supported by the standard documents. Furthermore, all terms disclosed in the present disclosure may be described in the standard documents.

[0141] With the rapid spread of smartphones and IoT devices, the amount of information exchanged through communication networks is increasing. Therefore, it is necessary to consider environments where next-generation wireless access technologies can provide faster services to more users than existing communication systems (or existing radio access technologies) (e.g., enhanced mobile broadband communications).

[0142] To this end, the design of communication systems that consider machine-type communication (MTC), which provides services by connecting multiple devices and objects, is under discussion. Furthermore, the design of communication systems that consider services and / or terminals that are sensitive to communication reliability and / or latency, such as ultra-reliable and low-latency communication (URLLC), is also under discussion.

[0143] Hereinafter, in this disclosure, for convenience of description, the next generation wireless access technology is referred to as NR (New RAT, Radio Access Technology), and a wireless communication system to which NR is applied is referred to as an NR system.

[0144] Definition of NR system-related terms

[0145] eLTE eNB: eLTE eNB is the evolution of eNB that supports connectivity to EPC and NGC.

[0146] gNB: A node that supports NR and connectivity to NGC.

[0147] New RAN: A radio access network that supports NR or E-UTRA or interfaces with the NGC.

[0148] Network Slicing: A network slice is an operator-defined network that is customized to provide optimized solutions for specific market scenarios requiring specific requirements along with end-to-end scope.

[0149] Network Function: A network function is a logical node within the network infrastructure with a well-defined external interface and well-defined functional behavior.

[0150] NG-C: Control plane interface for the NG2 reference point between New RAN and NGC.

[0151] NG-U: User plane interface for the NG3 reference point between New RAN and NGC.

[0152] Non-standalone NR: A deployment configuration in which the gNB requires an LTE eNB as an anchor point for control plane connectivity with the EPC, or an eLTE eNB as an anchor point for control plane connectivity with the NGC.

[0153] Non-standalone E-UTRA: The eLTE eNB requires the gNB as an anchor point for control plane connection with the NGC.

[0154] User Plane Gateway: The endpoint of the NG-U interface.

[0155] Figure 6 An example of the overall structure of a NR system to which the method proposed in this disclosure can be applied is illustrated.

[0156] Reference Figure 6 , NG-RAN is configured with the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PH Y) and the gNB that provides the control plane (RRC) protocol end for the user equipment (UE).

[0157] gNBs are interconnected via the Xn interface.

[0158] The gNB is also connected to the NGC via the NG interface.

[0159] More specifically, the gNB is connected to the Access and Mobility Management Function (AMF) through the N2 interface and to the User Plane Function (UPF) through the N3 interface.

[0160] NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, if the SCS is 15kHz, NR supports a wide range in typical cellular bands. If the SCS is 30kHz / 60kHz, NR supports dense urban areas, low latency, and wider carrier bandwidths. If the SCS is 60kHz or higher, NR supports bandwidths greater than 24.25GHz to overcome phase noise.

[0161] The NR band is defined as two types of frequency ranges, FR1 and FR2. FR1 and FR2 can be configured as shown in Table 4 below. In addition, FR2 may refer to millimeter waves (mmW).

[0162] [Table 4]

[0163] Frequency range name Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0164] New Rat (NR) parameter set and frame structure

[0165] In NR systems, multiple parameter sets can be supported. The parameter set can be defined by the subcarrier spacing and the CP (cyclic prefix) overhead. The spacing between multiple subcarriers can be derived by scaling the basic subcarrier spacing to an integer N (or μ). In addition, although it is assumed that very small subcarrier spacing is not used for very high subcarrier frequencies, the parameter set to be used can be selected independently of the frequency band.

[0166] In addition, in the NR system, various frame structures based on multiple parameter sets can be supported.

[0167] Hereinafter, the Orthogonal Frequency Division Multiplexing (OFDM) parameter set and frame structure that can be considered in the NR system will be described.

[0168] Multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 5.

[0169] [Table 5]

[0170] μ <![CDATA[Δf=2 μ ·15[kHz]]]> cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0171] Regarding the frame structure in the NR system, the size of each field in the time domain is expressed as a time unit T s =1 / (Δf max ·N f ). In this case, Δf max =480.10 3 And N f =4096. DL and UL transmissions are configured with interval T f =(Δf max N f / 100)·T s=10ms radio frame. The radio frame consists of ten subframes, each of which has an interval T sf =(Δf max N f / 1000)·T s =1 ms. In this case, there may be a set of UL frames and a set of DL frames.

[0172] Figure 7 The relationship between uplink frames and downlink frames in a wireless communication system to which the method proposed in the present disclosure can be applied is illustrated.

[0173] like Figure 7 As illustrated in FIG, the uplink frame number i sent from the user equipment (UE) should be T before the start of the corresponding downlink frame at the corresponding UE. TA =N TA T s start.

[0174] Regarding the parameter set μ, in increasing order within the subframe The time slots are numbered and in increasing order within the radio frame The time slots are numbered. A time slot consists of consecutive OFDM symbols, and The timeslot in a subframe is determined by the parameter set and time slot configuration used. The beginning of the OFDM symbol in the same subframe Start aligning.

[0175] Not all UEs are capable of transmitting and receiving simultaneously, and this means that not all OFDM symbols in a downlink or uplink timeslot may be available for use.

[0176] Table 6 shows the number of OFDM symbols per time slot in normal CP Number of time slots per radio frame and the number of time slots per subframe Table 7 represents the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0177] [Table 6]

[0178]

[0179] [Table 7]

[0180]

[0181] Figure 8 An example of a frame structure in an NR system is illustrated. Figure 8It is only for the convenience of description and does not limit the scope of the present disclosure.

[0182] In Table 7, in the case of μ=2, that is, as an example in which the subcarrier spacing (SCS) is 60 kHz, one subframe (or frame) may include four time slots with reference to Table 7 and, for example Figure 8 One subframe = {1, 2, 4} slots shown in , the number of slots that can be included in one subframe may be defined as in Table 7.

[0183] Additionally, a mini-slot may consist of 2, 4, or 7 symbols, or may consist of more or fewer symbols.

[0184] Regarding the physical resources in the NR system, we can consider antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc.

[0185] Hereinafter, the above physical resources that can be considered in the NR system are described in more detail.

[0186] First, regarding antenna ports, antenna ports are defined so that the channel conveying symbols on the antenna port can be derived from the channel conveying symbols on the same antenna port. When large-scale characteristics of the channel conveying symbols on one antenna port can be derived from the channel conveying symbols on another antenna port, the two antenna ports can be considered to be in a quasi-co-located or quasi-co-located (QC / QCL) relationship. In this case, the large-scale characteristics may include at least one of delay spread, Doppler spread, frequency shift, average received power, and receive timing.

[0187] Figure 9 An example of a resource grid supported in a wireless communication system to which the method proposed in the present disclosure can be applied is illustrated.

[0188] Reference Figure 9 , the resource grid is composed of subcarriers, and each subframe consists of 14·2μ OFDM symbols, but the present invention is not limited thereto.

[0189] In the NR system, subcarriers and One or more resource grids consisting of OFDM symbols describe the transmitted signal, where Indicates the maximum transmission bandwidth and varies not only between parameter sets but also between uplink and downlink.

[0190] In this case, if Figure 10 As illustrated in , one resource grid may be configured for each parameter set μ and antenna port p.

[0191] Figure 10 An example of a resource grid for each antenna port and parameter set to which the method proposed in this disclosure can be applied is illustrated.

[0192] Each element of the resource grid for a parameter set μ and antenna port p is called a resource element and is indexed by Uniquely identifies, where is an index in the frequency domain, and Refers to the position of the symbol in the subframe. Used to represent resource elements in a time slot, where

[0193] Resource elements for parameter set μ and antenna port p Corresponding to complex values When there is no risk of confusion or when no specific antenna port or parameter set is specified, the indices p and μ can be dropped, and as a result, the complex value may be or

[0194] In addition, physical resource blocks are defined as consecutive subcarriers.

[0195] Point A serves as a common reference point for the resource block grid and can be obtained as follows.

[0196] -OffsetToPointA for PCell downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block used by the UE for initial cell selection, and is expressed in resource blocks assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2.

[0197] -absoluteFrequencyPointA represents the frequency position of point A expressed in absolute radio frequency channel number (ARFCN).

[0198] For the subcarrier spacing configuration μ, the common resource blocks are numbered from 0 upwards in the frequency domain.

[0199] The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ coincides with "point A". The number of common resource blocks in the frequency domain can be given by the following formula 1 and resource elements (k, l) configured for subcarrier spacing μ.

[0200] [Formula 1]

[0201]

[0202] In this case, k can be defined relative to point A so that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks are defined within a bandwidth part (BWP) and are numbered from 0 to Number them, where i is the number of BWP. BWP can be given by the following formula 2 i Physical resource block n in PRB With public resource block n CRB The relationship between them.

[0203] [Formula 2]

[0204]

[0205] in this case, It can be a common resource block where the BWP starts relative to common resource block 0.

[0206] Self-contained structure

[0207] The time division duplex (TDD) structure considered in the NR system is a structure in which both the uplink (UL) and downlink (DL) are processed in one time slot (or subframe). This structure is intended to minimize the latency of data transmission in the TDD system and can be called a self-contained structure or self-contained time slot.

[0208] Figure 11 An example of a self-contained structure to which the method proposed in this disclosure can be applied is illustrated. Figure 11 It is only for the convenience of description and does not limit the scope of the present disclosure.

[0209] Reference Figure 11 , as in conventional LTE, it is assumed that one transmission unit (eg, time slot, subframe) consists of 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols.

[0210] exist Figure 11 , region 902 means a downlink control region, and region 904 means an uplink control region. In addition, regions other than region 902 and region 904 (ie, regions not separately indicated) may be used to transmit downlink data or uplink data.

[0211] That is, uplink control information and downlink control information can be transmitted in one self-contained time slot. On the other hand, in the case of data, uplink data or downlink data can be transmitted in one self-contained time slot.

[0212] When using Figure 11 In the structure illustrated in , downlink transmission and uplink transmission can be performed sequentially in one self-contained time slot, and downlink data transmission and uplink ACK / NACK reception can be performed.

[0213] As a result, if an error occurs in data transmission, the time required before the data is resent can be reduced. Therefore, the delay associated with data transmission can be minimized.

[0214] exist Figure 11 In the self-contained slot structure illustrated in

[15] , a base station (e.g., eNodeB, eNB, gNB) and / or a user equipment (UE) (e.g., a terminal) requires a time gap for a process of switching a transmission mode to a reception mode or a process of switching a reception mode to a transmission mode. Regarding the time gap, if uplink transmission is performed after downlink transmission in the self-contained slot, some OFDM symbols may be configured as a guard period (GP).

[0215] Downlink channel structure

[0216] The BS transmits an association signal to the UE through a downlink channel described below, and the UE receives an association signal from the BS through the downlink channel described below.

[0217] Physical Downlink Shared Channel (PDSCH)

[0218] PDSCH transmits downlink data (e.g., DL shared channel transport block (DL-SCH TB)) and adopts modulation methods such as quadrature phase shift keying (QPSK), 16-bit quadrature amplitude modulation (QAM), 64QAM, and 256QAM. Codewords are generated by encoding TBs. PDSCH can transmit up to 2 codewords. Scrambling and modulation mapping are performed for each codeword, and the modulation symbols generated from each codeword are mapped to one or more layers (layer mapping). Each layer is mapped to a resource together with a demodulation reference signal (DMRS), generated as an OFDM symbol signal, and sent through the corresponding antenna port.

[0219] Physical Downlink Control Channel (PDCCH)

[0220] PDCCH transmits downlink control information (DCI) and applies the QPSK modulation method. Depending on the aggregation level (AL), one PDCCH consists of 1, 2, 4, 8, and 16 control channel elements (CCE). One CCE consists of 6 resource element groups (REGs). One REG is defined by one OFDM symbol and one (P)RB. PDCCH is transmitted through a control resource set (CORESET). A CORESET is defined as a set of REGs with a given parameter set (e.g., SCS, CP length, etc.). Multiple CORESETs for one UE can overlap in the time domain / frequency domain. The CORESET can be configured by system information (e.g., MIB) or UE-specific high-layer (e.g., radio resource control or RRC layer) signaling. Specifically, the number of RBs and the number of symbols (up to 3) that constitute the CORESET can be configured by high-layer signaling.

[0221] The UE performs decoding (so-called blind decoding) on ​​a set of PDCCH candidates to obtain the DCI sent via the PDCCH. The set of PDCCH candidates decoded by the UE is defined as a PDCCH search space set. The search space set can be a common search space or a UE-specific search space. The UE can obtain DCI by monitoring PDCCH candidates in one or more search space sets configured by the MIB or higher-layer signaling. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with one CORESET configuration. A search space set is determined based on the following parameters.

[0222] -controlResourceSetId: Indicates the control resource set associated with the search space set

[0223] -monitoringSlotPeriodicityAndOffset: indicates the PDCCH monitoring period (time slot unit) and the PDCCH monitoring period offset (time slot unit)

[0224] -monitoringSymbolsWithinSlot: indicates the PDCCH monitoring pattern in the slot used for PDCCH monitoring (e.g., indicating the first symbol of the control resource set)

[0225] -nrofCandidates: indicates the number of PDCCH candidates for each AL = {1, 2, 4, 8, 16} (one of 0, 1, 2, 3, 4, 5, 6, 8)

[0226] Table 8 shows the characteristics for each search space type.

[0227] [Table 8]

[0228]

[0229]

[0230] Table 9 shows the DCI format transmitted through the PDCCH.

[0231] [Table 9]

[0232]

[0233] DCI format 0_0 can be used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG) (or CBG-level) PUSCH. DCI format 1_0 can be used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule TB-based (or TB-level) PDSCH or code block group (CBG) (or CBG-level) PDSCH. DCI format 2_0 is used to transmit dynamic time slot format information (e.g., dynamic SFI) to the UE, and DCI format 2_1 is used to transmit downlink preemption information to the UE. DCI format 2_0 and / or DCI format 2_1 can be transmitted to the UEs in the corresponding group via a group-common PDCCH as a PDCCH transmitted to UEs defined as a group.

[0234] Uplink channel structure

[0235] The UE transmits an association signal to the BS through an uplink channel described below, and the BS receives the association signal from the UE through an uplink channel described below.

[0236] Physical Uplink Shared Channel (PUSCH)

[0237] The PUSCH transmits uplink data (e.g., UL shared channel transport blocks, UL-SCH TBs) and / or uplink control information (UCI) and is sent based on a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. When the PUSCH is sent based on a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. As an example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on a CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE may transmit the PUSCH based on a CP-OFDM waveform or a DFT-s-OFDM waveform. PUSCH transmission is dynamically scheduled by a UL grant in the DCI or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or layer 1 (L1) signaling (e.g., PDCCH)) (configured grant). PUSCH transmission can be performed based on a codebook or a non-codebook.

[0238] Physical Uplink Control Channel (PUCCH)

[0239] The PUCCH transmits uplink control information, HARQ-ACK, and / or a scheduling request (SR), and is divided into a short PUCCH and a long PUCCH according to a PUCCH transmission length. Table 10 shows a PUCCH format.

[0240] [Table 10]

[0241]

[0242] PUCCH format 0 transmits UCI with a maximum size of 2 bits and is mapped and transmitted based on a sequence. Specifically, the UE sends specific UCI to the base station by sending one of multiple sequences using PUCCH format 0. The UE sends PUCCH format 0 only when sending a positive SR, within the PUCCH resources configured for the corresponding SR.

[0243] PUCCH format 1 transmits UCI with a maximum size of 2 bits, and the modulated signal is spread in the time domain using an orthogonal cover code (OCC) (configured differently depending on whether frequency hopping is used). DMRS is transmitted in symbols other than modulation symbols (i.e., time-division multiplexed (TDM) and transmitted).

[0244] PUCCH format 2 transmits UCI with a bit size greater than 2 bits, and modulated symbols are frequency-division multiplexed (FDM) with DMRS. DMRS are located in symbol indices #1, #4, #7, and #10 within a resource block with a density of 1 / 3. A pseudo-noise (PN) sequence is used for the DMRS sequence. Frequency hopping can be activated for 2-symbol PUCCH format 2.

[0245] PUCCH format 3 does not support multiplexing of UEs in the same physical resource block and transmits UCI with a bit size greater than 2 bits. In other words, PUCCH resources of PUCCH format 3 include orthogonal cover codes. Modulation symbols are time-division multiplexed (TDM) with DMRS and transmitted.

[0246] PUCCH format 4 supports multiplexing up to four terminals in the same physical resource block and transmits UCI with a bit size greater than 2 bits. In other words, PUCCH resources in PUCCH format 3 include orthogonal cover codes. Modulation symbols are time-division multiplexed (TDM) with DMRS and transmitted.

[0247] Machine Type Communication (MTC)

[0248] MTC is a type of data communication involving one or more machines and can be applied to machine-to-machine (M2M) and the Internet of Things (IoT). Here, a machine is an entity that does not require direct human operation or intervention. Examples include smart meters with mobile communication modules, vending machines, and portable terminals with MTC capabilities.

[0249] In 3GPP, MTC can be applied starting from Release 10, and MTC can be implemented to meet the standards of low cost and low complexity, enhanced coverage and low power consumption. For example, features for low-cost MTC devices are added to 3GPP Release 12, and for this purpose, UE Category 0 is defined. The UE category is an index indicating how much data the UE can process in the communication modem. UEs of UE Category 0 use half-duplex operation with a reduced peak data rate and alleviated radio frequency (RF) requirements and a single receive antenna to reduce baseband / RF complexity. In 3GPP Release 12, enhanced MTC (eMTC) was introduced, and the MTC terminal is configured to operate only at 1.08 MHz (i.e., 6 RBs), which is the minimum frequency bandwidth supported in conventional LTE, to further reduce the price and power consumption of MTC UEs.

[0250] In the following description, MTC may be used interchangeably with terms such as eMTC, LTE-M1 / M2, bandwidth-reduced low complexity / coverage-enhanced (BL / CE), non-BL UE (in enhanced coverage), NR MTC, enhanced BL / CE, or other equivalent terms. Furthermore, MTC UE / device encompasses UE / device with MTC functionality (e.g., a smart meter, a vending machine, or a portable terminal with MTC functionality).

[0251] Figure 12 MTC is illustrated.

[0252] Reference Figure 12 The MTC device 100, a wireless device providing MTC, can be either fixed or mobile. For example, the MTC device 100 includes a smart meter with a mobile communication module, a vending machine, or an MTC-enabled portable terminal. The BS 200 can connect to the MTC device 100 using radio access technology and to the MTC server 700 via a wired network. The MTC server 700 connects to the MTC device 100 and provides MTC services to the MTC device 100. Services provided by MTC differ from human-mediated communication services in related technologies and can include tracking, metering, payment, medical field services, remote control, and more. For example, MTC can provide services such as meter reading, water level measurement, surveillance camera usage, and vending machine inventory reports. MTC has the following characteristics: the amount of transmitted data is small, and uplink / downlink data transmission / reception occurs infrequently. Therefore, the low data rate effectively reduces the unit price of MTC devices and reduces battery consumption. MTC devices generally have low mobility, and therefore, the channel environment rarely changes.

[0253] Figure 13 This section illustrates the physical channels used in MTC and general signal transmission using them. In wireless communication systems, MTC UEs receive information from a base station (BS) via a downlink (DL) and transmit information to the BS via an uplink (UL). The information transmitted and received by the BS and UE includes data and various control information. Various physical channels exist depending on the type and purpose of the information transmitted and received by the BS and UE.

[0254] When a UE is powered on again or enters a new cell after being powered off, it performs an initial cell search operation such as synchronization with the base station (S1001). To this end, the UE receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as a cell identifier (ID). The PSS / SSS for the UE's initial cell search operation may be the PSS / SSS of conventional LTE. Thereafter, the MTC UE may receive a physical broadcast channel (PBCH) from the base station and obtain intra-cell broadcast information (S1002). In addition, the UE receives a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel status.

[0255] After completing the initial cell search, the UE receives the MTC PDCCH (MPDCCH) and its corresponding PDSCH to obtain more specific system information ( S1102 ).

[0256] After that, the UE can perform a random access procedure to complete access to the BS (S1003 to S1006). Specifically, the UE can transmit a preamble through a physical random access channel (PRACH) (S1003) and receive a random access response (RAR) for the preamble through a PDCCH and its corresponding PDSCH (S1004). Thereafter, the UE can transmit a physical uplink shared channel (PUSCH) (S1005) by using the scheduling information in the RAR and perform a contention resolution procedure such as a PDCCH and its corresponding PDSCH (S1006).

[0257] The UE that has performed the above-described process can then receive MPDCCH signals and / or PDSCH signals (S1107) and transmit Physical Uplink Shared Channel (PUSCH) signals and / or Physical Uplink Control Channel (PUCCH) signals (S1108) as a standard uplink / downlink signal transmission process. The control information sent from the UE to the base station is collectively referred to as uplink control information (UCI). UCI includes hybrid automatic repeat and request acknowledgement / negative acknowledgement (HARQ ACK / NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indication (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc.

[0258] Figure 14 Cell coverage enhancement in MTC is illustrated.

[0259] Various cell coverage extension technologies are being discussed to facilitate extending the coverage of the BS for the MTC device 100 (coverage extension or coverage enhancement (CE)). For example, to extend the cell coverage, the BS / UE may transmit a physical channel / signal over multiple opportunities (physical channel bundles). Within a bundle section, the physical channel / signal may be repeatedly transmitted according to a predefined rule. The receiving device may improve the decoding success rate of the physical channel / signal by decoding part or all of the physical channel / signal bundle. Here, the opportunity may refer to a resource (e.g., time / frequency) in which the physical channel / signal may be transmitted / received. The opportunity for the physical channel / signal may include a subframe, a time slot, or a symbol set in the time domain. Here, the symbol set may consist of one or more consecutive OFDM-based symbols. OFDM-based symbols may include OFDM(A) symbols and DFT-s-OFDM(A) (=SC-FDM(A)) symbols. The opportunity for the physical channel / signal may include an RB set and a frequency band in the frequency domain. For example, the PBCH, PRACH, MPDCCH, PDSCH, PUCCH, and PUSCH may be repeatedly transmitted.

[0260] Figure 15 The signal frequency band for MTC is illustrated.

[0261] Reference Figure 15 As a method for reducing the unit price of MTC UEs, MTC can operate only in a specific frequency band (or channel band) (hereinafter referred to as MTC subband or narrowband (NB)) regardless of the system bandwidth of the cell. For example, uplink / downlink operations of MTC UEs can be performed only in a frequency band of 1.08 MHz. 1.08 MHz corresponds to 6 consecutive physical resource blocks (PRBs) in the LTE system, which is defined to follow the same cell search and random access procedures as LTE UEs. Figure 15 (a) illustrates a case where the MTC subband is configured in the center of the cell (for example, 6 PRBs), and Figure 15(b) illustrates the case where multiple MTC subbands are configured in a cell. Multiple MTC subbands can be configured continuously / discontinuously in the frequency domain. Physical channels / signals for MTC can be sent / received in one MTC subband. In the NR system, the MTC subband can be defined by considering the frequency range and subcarrier spacing (SCS). As an example, in the NR system, the size of the MTC subband can be defined as X consecutive PRBs (i.e., a bandwidth of 0.18*X*(2^u) MHz) (u is shown in Table A4). Here, X can be defined as 20 according to the size of the synchronization signal / physical broadcast channel (SS / PBCH). In the NR system, MTC can operate in at least one bandwidth part (BWP). In this case, multiple MTC subbands can be configured in the BWP.

[0262] Figure 16 Scheduling in conventional LTE and MTC is illustrated.

[0263] Reference Figure 16In legacy LTE, the PDSCH is scheduled using the PDCCH. Specifically, the PDCCH can be transmitted in the first N OFDM symbols (N = 1 to 3) of a subframe, and the PDSCH scheduled by the PDCCH can be transmitted in the same subframe. Furthermore, in MTC, the PDSCH is scheduled using the MPDCCH. As a result, an MTC UE can monitor the search space within a subframe for MPDCCH candidates. Here, monitoring includes blind decoding of the MPDCCH candidates. The MPDCCH transmits DCI, which includes uplink or downlink scheduling information. The MPDCCH is FDM-multiplexed with the PDSCH within a subframe. The MPDCCH is repeatedly transmitted in up to 256 subframes, and the DCI transmitted by the MPDCCH includes information about the number of MPDCCH repetitions. In the case of downlink scheduling, when the repeated transmission of the MPDCCH ends in subframe #N, the PDSCH scheduled by the MPDCCH begins transmission in subframe #N+2. The PDSCH can be repeatedly transmitted in up to 2048 subframes. The MPDCCH and PDSCH can be transmitted in different MTC subbands. As a result, the MTC UE can perform radio frequency (RF) retuning to receive the PDSCH after receiving the MPDCCH. In the case of uplink scheduling, when repeated transmission of the MPDCCH ends in subframe #N, the PUSCH scheduled by the MPDCCH begins transmission in subframe #N+4. When repeated transmission is applied to the physical channel, frequency hopping between different MTC subbands is supported through RF retuning. For example, when the PDSCH is repeatedly transmitted in 32 subframes, the PDSCH can be transmitted in the first MTC subband in the first 16 subframes, and the PDSCH can be transmitted in the second MTC subband in the remaining 16 subframes. MTC operates in half-duplex mode. The HARQ retransmission of MTC is an adaptive asynchronous scheme.

[0264] Narrowband Internet of Things (NB-IoT)

[0265] NB-IoT represents a narrowband Internet of Things technology that supports low-power wide area networks through traditional wireless communication systems (e.g., LTE, NR). In addition, NB-IoT can refer to a system that supports low complexity and low power consumption through narrowband. The NB-IoT system uses OFDM parameters such as subcarrier spacing (SCS) in the same way as traditional systems, so there is no need to allocate additional frequency bands separately for the NB-IoT system. For example, one PRB of the traditional system frequency band can be allocated to NB-IoT. Since the NB-IoT UE identifies a single PRB as each carrier, PRB and carrier can be interpreted as the same meaning in the description of NB-IoT.

[0266] In the following, the description of NB-IoT focuses on the case where NB-IoT is applied to the description of the traditional LTE system, but the following description can even be widely applied to the next generation system (e.g., NR system, etc.). In addition, in this disclosure, the content related to NB-IoT can be widely applied to MTC that aims to achieve similar technical goals (e.g., low power, low cost, coverage enhancement, etc.). In addition, NB-IoT can be replaced by other equivalent terms such as NB-LTE, NB-IoT enhanced, enhanced NB-IoT, further enhanced NB-IoT, NB-NR, etc.

[0267] Figure 17 This section illustrates the physical channels used in NB-IoT and the general signal transmission using them. In wireless communication systems, a UE receives information from a base station (BS) via a downlink (DL) and transmits information to the BS via an uplink (UL). The information transmitted and received by the BS and UE includes data and various control information. Various physical channels exist depending on the type and purpose of the information transmitted and received by the BS and UE.

[0268] When a UE is powered on again after powering off or entering a new cell, it performs an initial cell search operation, such as synchronization with the base station (BS) (S11). To this end, the UE receives a narrowband primary synchronization signal (NPSS) and a narrowband secondary synchronization signal (NSSS) from the base station to synchronize with the base station and obtain information such as a cell identifier (ID). Thereafter, the UE receives a narrowband physical broadcast channel (NPBCH) from the base station to obtain intra-cell broadcast information (S12). Furthermore, during the initial cell search, the UE receives a downlink reference signal (DL RS) to check the downlink channel status.

[0269] Upon completion of the initial cell search, the UE receives a narrowband PDCCH (NPDCCH) and its corresponding narrowband PDSCH (NPDSCH) in step S12 to obtain more specific system information (S12).

[0270] After that, the UE can perform a random access procedure to complete access to the BS (S13 to S16). Specifically, the UE can send a preamble through a narrowband physical random access channel (NPRACH) (S13) and receive a random access response (RAR) for the preamble through the NPDCCH and the corresponding NPDSCH (S14). After that, the UE can send a narrowband physical uplink shared channel (NPUSCH) (S15) by using the scheduling information in the RAR and perform a contention resolution procedure such as the NPDCCH and the corresponding NPDSCH (S16).

[0271] The UE that performs the above process can then perform reception (S17) of NPDCCH signals and / or NPDSCH signals and / or transmission (S18) of NPUSCH as a general uplink / downlink signal transmission process. The control information sent from the UE to the BS is collectively referred to as uplink control information (UCI). UCI includes hybrid automatic repeat and request acknowledgment / negative acknowledgment (HARQ ACK / NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indication (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. In NB-IoT, UCI is sent through NPUSCH. According to the request / instruction of the network (e.g., BS), the UE can send UCI periodically, aperiodically, or semi-persistently through NPUSCH.

[0272] The NB-IoT frame structure can be configured differently according to the subcarrier spacing (SCS). Figure 18 The frame structure when the subframe interval is 15kHz is illustrated, and Figure 19 The frame structure when the subframe interval is 3.75 kHz is illustrated. Figure 18 The frame structure can be used for downlink / uplink, and Figure 19 The frame structure can be used only for uplink.

[0273] Reference Figure 18 , the NB-IoT frame structure for 15kHz subcarrier spacing can be configured to be the same as the frame structure of the traditional system (ie, LTE system) (see Figure 2 ) are the same. That is, a 10-ms NB-IoT frame may include ten 1-ms NB-IoT subframes, and a 1-ms NB-IoT subframe may include two 0.5-ms NB-IoT time slots. Each 0.5-ms NB-IoT time slot may include seven symbols. 15kHz subcarrier spacing may be applied to both downlink and uplink. Symbols include OFDMA symbols in the downlink and SC-FDMA symbols in the uplink. Figure 18 In the frame structure of LTE, the system frequency band is 1.08 MHz and is defined by 12 subcarriers. 15-kHz subcarrier spacing is applied to both downlink and uplink, and is guaranteed to be orthogonal to the LTE system, thus facilitating coexistence with the LTE system.

[0274] In addition, refer to Figure 19, when the subcarrier spacing is 3.75kHz, a 10-ms NB-IoT frame may include five 2-ms NB-IoT subframes, and a 2-ms NB-IoT subframe may include seven symbols and one guard period (GP) symbol. The 2-ms NB-IoT subframe may be expressed as an NB-IoT time slot or an NB-IoT resource unit (RU). Here, the symbol may include an SC-FDMA symbol. Figure 19 In the LTE frame structure, the system frequency band is 1.08 MHz and is defined by 48 subcarriers. The 3.75 kHz subcarrier spacing can only be applied to the uplink and may weaken the orthogonality with the LTE system, resulting in performance degradation due to interference.

[0275] This figure can illustrate the NB-IoT frame structure based on the LTE system frame structure, and the illustrated NB-IoT frame structure can even be widely applied to next-generation systems (e.g., NR systems).

[0276] Figure 20 The three operation modes of NB-IoT are illustrated. Specifically, Figure 20 (a) illustrates an in-band system, Figure 20 (b) illustrates a guard band system, and Figure 20 (c) illustrates a standalone system. Here, the in-band system can be expressed as in-band mode, the guard band system can be expressed as guard band mode, and the standalone system can be expressed as standalone mode. For convenience, the NB-IoT operation mode is described based on the LTE band, but the LTE band can be replaced with the band of another system (for example, the NR system band).

[0277] In-band mode means an operating mode in which NB-IoT is performed in a (traditional) LTE band. In in-band mode, some resource blocks of the LTE system carrier can be allocated to NB-IoT. For example, in in-band mode, a specific 1 RB (i.e., PRB) in the LTE band segment can be allocated to NB-IoT. In-band mode can operate in a structure in which NB-IoT coexists in the LTE band. Guard band mode means an operating mode in which NB-IoT is performed in the space reserved for the guard band of the (traditional) LTE band. Therefore, in guard band mode, a guard band of an LTE carrier that is not used as a resource block in the LTE system can be allocated to NB-IoT. The (traditional) LTE band can have a guard band of at least 100kHz at the end of each LTE band. Standalone mode means an operating mode in which NB-IoT is performed in a band independent of the (traditional) LTE band. For example, in standalone mode, a band used in the GSM EDGE Radio Access Network (GERAN) (e.g., a GSM carrier to be reallocated in the future) can be allocated to NB-IoT.

[0278] NB-IoT UEs search for anchor carriers in 100kHz increments. The center frequency of the anchor carrier should be within ±7.5kHz of the 100kHz channel grid within the in-band and guard bands. Furthermore, the six central PRBs within the LTE PRBs are not allocated to NB-IoT. Therefore, the anchor carrier can be located only in specific PRBs.

[0279] Figure 21 The layout of an in-band anchor carrier with an LTE bandwidth of 10 MHz is illustrated.

[0280] Reference Figure 21 , the direct current (DC) subcarrier is located in the channel grid. Since the center frequency spacing between adjacent PRBs is 180kHz, the center frequencies are located at ±2.5kHz from the channel grid for PRB indices 4, 9, 14, 19, 30, 35, 40, and 45. Similarly, the center frequencies of PRBs suitable as anchor carriers for LTE bandwidths of 20MHz are located at ±2.5kHz from the channel grid, and the center frequencies of PRBs suitable as anchor carriers for LTE bandwidths of 3MHz, 5MHz, and 15MHz are located at ±7.5kHz from the channel grid.

[0281] In the case of guard band mode, the center frequency is located at ±2.5kHz from the channel raster when the PRB is adjacent to the edge PRB for LTE bandwidths of 10MHz and 20MHz. In the case of bandwidths of 3MHz, 5MHz and 15MHz, the guard band corresponding to three subcarriers from the edge PRB is used to position the center frequency of the anchor carrier at ±7.5kHz from the channel raster.

[0282] The anchor carrier for standalone mode can be aligned in a 100kHz channel grid, and all GSM carriers including the DC carrier can be used as the NB-IoT anchor carrier.

[0283] NB-IoT can support multiple carriers and can use a combination of in-band and in-band, in-band and guard band, guard band and guard band, and independent and independent.

[0284] In the NB-IoT downlink, physical channels such as the narrowband physical broadcast channel (NPBCH), the narrowband physical downlink shared channel (NPDSCH) and the narrowband physical downlink control channel (NPDCCH) are provided, and physical signals such as the narrowband primary synchronization signal (NPSS), the narrowband secondary synchronization signal (NSSS) and the narrowband reference signal (NRS) are provided.

[0285] NPBCH transmits the Master Information Block - Narrowband (MIB-NB) to the UE as the minimum system information required for the NB-IoT access system. For coverage enhancement, the NPBCH signal can be repeated a total of eight times. The transport block size (TBS) of MIB-NB is 34 bits and is updated every 64ms TTI period. MIB-NB includes information such as operating mode, system frame number (SFN), super SFN, number of cell-specific reference signal (CRS) ports, channel grid offset, etc.

[0286] Figure 22 This example illustrates the transmission of NB-IoT downlink physical channels / signals in an FDD LTE system. The downlink physical channels / signals are transmitted using one PRB and support 15kHz subcarrier spacing / multi-tone transmission.

[0287] Reference Figure 22 , NPSS is sent in the 6th subframe of each frame, and NSSS is sent in the last (e.g., 10th) subframe of each even frame. The UE can use the synchronization signals (NPSS and NSSS) to obtain frequency, symbol, and frame synchronization and search for 504 physical cell IDs (PCIDs) (i.e., BS IDs). NPBCH is sent in the first subframe of each frame and transmits NB-MIB. NRS is provided as a reference signal for downlink physical channel demodulation and is generated with the same scheme as LTE. However, the physical cell ID (NB-PCID) (or NCell ID or NB-IoT BS ID) is used as an initialization value for NRS sequence generation. NRS is sent through one or two antenna ports. NPDCCH and NPDSCH can be sent in the remaining subframes except NPSS / NSSS / NPBCH. NPDCCH and NPDSCH can be sent together in the same subframe. NPDCCH transmits DCI, and DCI supports three types of DCI formats. DCI format N0 includes narrowband physical uplink shared channel (NPUSCH) scheduling information, and DCI formats N1 and N2 include NPDSCH scheduling information. For coverage enhancement, NPDCCH can be repeated a total of 2048 times. NPDSCH is used to transmit data (e.g., TB) for transport channels such as downlink shared channel (DL-SCH) and paging channel (PCH). The maximum TBS is 680 bits, and for coverage enhancement, it can be repeated a total of 2048 times.

[0288] The uplink physical channels include the narrowband physical random access channel (NPRACH) and NPUSCH, and support single-tone transmission and multi-tone transmission. Single-tone transmission is supported for 3.5kHz and 15kHz subcarrier spacing, and multi-tone transmission is supported only for 15kHz subcarrier spacing.

[0289] Figure 23 The NPUSCH format is illustrated.

[0290] NPUSCH supports two formats. NPUSCH format 1 is used for UL-SCH transmission, and the maximum TBS is 1000 bits. NPUSCH format 2 is used for transmission of uplink control information such as HARQ ACK signaling. NPUSCH format 1 supports single-tone / multi-tone transmission, and NPUSCH format 2 only supports single-tone transmission. In the case of single-tone transmission, pi / 2-binary phase shift keying (BPSK) and pi / 4-quadrature phase shift keying (QPSK) are used to reduce the peak-to-average power ratio (PAPR). In NPUSCH, the number of time slots occupied by one resource unit (RU) can vary depending on resource allocation. RU represents the minimum resource unit to which a TB is mapped, and consists of NULsymb*NULslots consecutive SC-FDMA symbols in the time domain and NRUsc consecutive subcarriers in the frequency domain. Here, NULsymb represents the number of SC-FDMA symbols in the time slot, NULslots represents the number of time slots, and NRUsc represents the number of subcarriers constituting the RU.

[0291] Table 11 shows the RU configuration according to the NPUSCH format and subcarrier spacing. In the case of TDD, the supported NPUSCH format and SCS vary according to the uplink-downlink configuration. The uplink-downlink configuration can refer to Table 2.

[0292] [Table 11]

[0293]

[0294] Scheduling information for transmitting UL-SCH data (e.g., UL-SCH TB) is included in DCI format No., and DCI format No. is sent through NPDCCH. DCI format No. includes information about the start time of NPUSCH, the number of repetitions, the number of RUs used for TB transmission, the number of subcarriers, resource locations in the frequency domain, and MCS.

[0295] Reference Figure 23 , depending on the NPUSCH format, DMRS is transmitted in one or three SC-FDMA symbols in each time slot. DMRS is multiplexed with data (e.g., TB, UCI) and is transmitted only in RUs including data transmission.

[0296] Figure 24 This section illustrates the operation when multiple carriers are configured in FDD NB-IoT.

[0297] In FDD NB-IoT, the DL / UL anchor carrier can be basically configured, and the DL (and UL) non-anchor carrier can be additionally configured. Information about the non-anchor carrier can be included in the RRCConnectionReconfiguration. When a DL non-anchor carrier is configured (downlink add carrier), the UE receives data only in the DL non-anchor carrier. On the other hand, synchronization signals (NPSS and NSSS), broadcast signals (MIB and SIB) and paging signals are only provided in the anchor carrier. When a DL non-anchor carrier is configured, the UE only listens to the DL non-anchor carrier when it is in the RRC_CONNECTED state. Similarly, when a UL non-anchor carrier is configured (uplink add carrier), the UE only sends data on the UL non-anchor carrier, and simultaneous transmission on the UL non-anchor carrier and the UL anchor carrier is not allowed. When the UE transitions to the RRC_IDLE state, the UE returns to the anchor carrier.

[0298] Figure 24 This example illustrates a case where only an anchor carrier is configured for UE1, a DL / UL non-anchor carrier is additionally configured for UE2, and a DL non-anchor carrier is additionally configured for UE3. As a result, carriers for transmitting / receiving data in each UE are as follows.

[0299] -UE1: data reception (DL anchor carrier) and data transmission (UL anchor carrier)

[0300] -UE2: data reception (DL non-anchor carrier) and data transmission (UL non-anchor carrier)

[0301] -UE3: data reception (DL non-anchor carrier) and data transmission (UL anchor carrier)

[0302] NB-IoT UEs may not be able to transmit and receive simultaneously, and transmit / receive operations are limited to one frequency band at a time. Therefore, even if multi-carrier is configured, the UE only needs a single transmit / receive chain for the 180kHz band.

[0303] Currently, New Radio (NR) systems support flexible slot formats. For example, even within a subframe and / or slot, flexible configuration for uplink (UL), downlink (DL), or each symbol is possible. On the other hand, in LTE IoT systems, since active / inactive configuration can only be performed on a subframe basis, for the purpose of efficient coexistence of NR and LTE IoT, resources need to be configured and used at a level smaller than a subframe. In other words, resources need to be configured and used on a slot and / or symbol basis.

[0304] Hereinafter, the present disclosure proposes a method for LTE IoT UE to efficiently coexist with NR at the same frequency band.

[0305] More specifically, the present disclosure describes a method of reserving resources in units of subframes / time slots / symbols (hereinafter, referred to as a first embodiment), and a method of managing reserved resources (hereinafter, referred to as a second embodiment).

[0306] In the present disclosure, LTE IoT may be used as a meaning including LTE MTC and / or NB-IoT.

[0307] Hereinafter, the embodiments described in the present disclosure are distinguished only for the convenience of description. Of course, some methods and / or configurations of any embodiment may be replaced by methods and / or configurations of other embodiments, or they may be combined and applied with each other.

[0308] In the present disclosure, “A / B” may be interpreted as “A and B”, “A or B” and / or “A and / or B”.

[0309] First embodiment

[0310] First, a method for reserving resources in units of subframes / time slots / symbols is described.

[0311] To enable LTE IoT UEs to coexist with NR at the same frequency band, a method of indicating flexible subframes / time slots / symbols in cell-specific radio resource control (RRC) configuration and / or UE-specific RRC configuration may be considered.

[0312] In order to coexist with NR supporting flexible time slot format, flexible resources (or reserved resources) can be indicated to LTE IoT UE through cell-specific configuration or RRC configuration. For example, flexible resources can be indicated to LTE IoT UE through cell-specific RRC configuration or UE-specific RRC configuration to coexist with NR supporting flexible time slot format.

[0313] The flexible resources described above may have no fixed duration in the downlink or uplink of the LTE IoT system, and may also be a duration for which LTE CRS is not expected. Furthermore, they may be downlink resources, depending on the LTE TDD configuration, special subframe configuration, and / or LTE IoT system configuration, but may be indicated as flexible resources. In this case, it is also possible to expect LTE CRS in the flexible resources.

[0314] And / or, the flexible resources are not configured with BL / CE subframes or valid subframes and therefore cannot be used for existing LTE IoT UEs. However, flexible resources may include the meaning of available resources of the Rel-16 LTE IoT UE configured by the base station (BS). For example, flexible resources may include the meaning of resources, wherein the Rel-16 LTE IoT UE supports more flexible time domain resource reservation in units of symbols and / or time slots, and therefore can use resources that are not yet available because the existing LTE IoT UE only supports time domain resource reservation in units of subframes. For example, the Rel-16 LTE IoT UE supports more flexible time domain resource reservation in units of symbols and / or time slots, and therefore can use resources that are not yet available because the existing LTE IoT UE only supports time domain resource reservation in units of subframes.

[0315] And / or, in the sense that flexible resources are resources that can be flexibly used only by Rel-16 UEs, the flexible resources have been configured as "invalid" for pre-Rel-16 UEs through subframe-level resource reservation. On the other hand, the flexible resources may be configured as "valid" for Rel-16 UEs through cell-specific RRC configuration, or although the flexible resources have been configured as "invalid" for Rel-16 UEs through cell-specific RRC configuration, the flexible resources may be configured as "valid" or indicated as available for Rel-16 UEs through UE-specific RRC configuration or downlink control information (DCI) signaling.

[0316] In the present disclosure, resources configured as "invalid" for Rel-16 LTE IoT UEs may be referred to as reserved resources. That is, resources configured as "invalid" for Rel-16 LTE IoT UEs may have the meaning of reserved resources for non-LTE MTC purposes. For example, time resources / frequency resources that an LTE MTC UE cannot expect as all or some uplink / downlink signals (because they are used as NR channels / signals) may be assigned to Rel-16 LTE MTC UEs as reserved resources. And / or, in the present disclosure, flexible resources may have the same meaning as reserved resources. And / or, reserved resources may be called on a per-subframe basis, and if all symbols within a subframe are reserved, then reserved resources may refer to a subframe.

[0317] By default, the reserved resources are semi-statically configured in units of a specific duration (e.g., symbol, slot, subframe) in the form of a bitmap or the like (e.g., slotBitmap, symbolBimap) through a cell-specific RRC configuration and / or a UE-specific RRC configuration, and the use of some or all of the corresponding reserved resources in units of the specific duration may be indicated via dynamic DCI signaling. For example, the reserved resources may be semi-statically configured in units of a specific duration in the form of a bitmap or the like through a cell-specific RRC configuration and / or a UE-specific RRC configuration, and the use of some or all of the corresponding reserved resources in units of the specific duration may be indicated via dynamic DCI signaling.

[0318] The specific duration of the bitmap (subframe-level bitmap / time slot-level bitmap / symbol-level bitmap) defining the semi-static time domain resource reservation can be determined as the period of a specific channel / signal used in NR. For example, the specific duration can be determined as a synchronization signal block (SSB) transmission period of 20ms assumed during the initial access of the UE in NR, or as one of the SSB transmission periods {5, 10, 20, 40, 80, 160}ms configured by RRC signaling. For example, the subframe-level bitmap / time slot-level bitmap / symbol-level bitmap can be configured in units of 10ms and / or 40ms. On the other hand, the unit of dynamic time domain resource reservation using DCI can be in units of subframes, time slots and / or symbols.

[0319] The base station may semi-statically configure reserved resources through a cell-specific RRC configuration and / or a UE-specific RRC configuration, and may instruct the use of some or all of the semi-statically reserved resources via DCI signaling. The UE may be instructed to configure semi-statically reserved resources through the cell-specific RRC configuration and / or the UE-specific RRC configuration, and may desire uplink / downlink transmission / reception on resources other than the reserved resources. In addition, additional resources for uplink / downlink transmission / reception may be allocated to the UE via DCI signaling.

[0320] For example, the base station may configure semi-static resource reservation based on the temporary location where the SSB can be transmitted (i.e., the candidate location of the SSB), and may configure dynamic resource reservation based on the actual transmission location of the SSB (i.e., the actual transmission location of the SS). In this case, DCI signaling may utilize resources where the actual SSB is not transmitted as DL resources via DL assignment DCI.

[0321] Hereinafter, the resource reservation method is described in detail by dividing the resource reservation method into a dynamic time domain resource reservation method, a dynamic frequency domain resource reservation method, and a dynamic NB domain resource reservation method.

[0322] Dynamic time domain resource reservation

[0323] For dynamic time domain resource reservation, the base station may previously configure the available or reserved time domain resources through RRC through dynamic indication, and then may indicate whether to use or reserve it via DCI signaling. This is to reduce DCI signaling overhead. For example, the base station may indicate via DCI signaling whether to use (or apply) RRC configuration or reserved resources. For example, the base station may indicate via DCI signaling whether to use or retain the reserved resources configured according to RRC.

[0324] For example, the UE may receive DCI and treat the reserved resources configured according to RRC as available resources to transmit and receive information. Alternatively, the UE may receive DCI, treat the reserved resources configured according to RRC as unavailable resources, and use resources other than the reserved resources to transmit and receive information.

[0325] The base station may configure semi-statically reserved resources through RRC configuration 1 and configure dynamic reserved resource information through RRC configuration 2, and the UE may selectively apply RRC configuration 1 and RRC configuration 2 via DCI signaling.

[0326] And / or, if RRC configuration 2 is a resource configured for additional use, the additional available resources may be indicated via DCI signaling. For example, if RRC configuration 2 is a configuration for additional use, the additional available resources may be indicated via DCI signaling.

[0327] And / or, if each of RRC configuration 1 and RRC configuration 2 is configured in the form of a bitmap of the same duration, the resources to be actually used or the reserved resources can be indicated in the form of and / or / exclusive or. And / or, the base station can pre-configure multiple dynamic reserved resource information, and in this state, one of the multiple dynamic reserved resource information can be indicated via DCI. For example, the base station can configure four dynamic reserved resources and then indicate one of the four dynamic reserved resources through DCI 2 bits. For example, the base station can configure RRC configuration 2-1, RRC configuration 2-2, RRC configuration 2-3 and RRC configuration 2-4, and then indicate one of them through DCI 2 bits.

[0328] Alternatively, the base station may add a field to the DCI or redefine the purpose of sending dynamic reserved resource information for scheduling flexibility. For example, the base station may indicate in the form of a combination index so that all scenarios are implemented in specific units within a specific duration for full flexibility. In this case, the specific duration and specific unit may be preconfigured by a higher-layer configuration. For example, the specific duration and specific unit may be preconfigured by a higher-layer signal. For example, the specific duration may be a subframe, and the specific unit may be a symbol.

[0329] Dynamic frequency domain resource reservation

[0330] For dynamic frequency domain resource reservation, the base station may reuse the existing resource block (RB) allocation field of the UL / DL DCI and indicate available or reserved frequency domain resources.

[0331] Dynamic NB resource reservation

[0332] The base station can support dynamic resource reservation in units of narrowband (NB) by specifying and / or releasing available or reserved resources for each narrowband (NB) or NB-IoT carrier via dynamic DCI signaling. The above information can be sent by adding a field to the DCI, and the designation and / or release of the NB can be applied after a specific time (e.g., X=4 subframes). For example, the specific time can be determined in the fourth subframe after the subframe in which the DCI is sent / received.

[0333] And / or, NB hopping may be performed as in the following method 1 and / or method 2.

[0334] (Method 1) If an NB is designated and / or released after a specific time, NB hopping of the LTE MTC UE may operate based on the NB after being designated and / or released.

[0335] Because method 1 may cause conflicts with other UEs, it can be applied only when the NB is specifically designated and / or released by a cell. For example, the NB hopping operation of the LTE MTC UE can be applied only when the NB is specifically designated and / or released by a cell.

[0336] (Method 2) NB hopping of LTE MTC UE can be operated based on the NB before being assigned and / or released. In this case, the released NB can be punctured or postponed.

[0337] And / or, the two methods can be distinguished by indicating the search space and / or radio network temporary identifier (RNTI) in which the DCI for the corresponding dynamic NB assignment and / or release is sent. For example, method 1 can be applied to DCI sent to the common search space, and method 2 can be applied to DCI sent to the UE-specific search space.

[0338] Flexible resources can be configured in time units, that is, selectively configured at the subframe / time slot / symbol level, and the corresponding units may not be continuous. For example, if flexible resources are indicated in symbol units, the number of flexible symbols within the corresponding subframe / time slot can use the minimum number of downlink symbols / uplink symbols supported by the LTE IoT system as the minimum value, and subsequent values ​​may not be continuous.

[0339] And / or, even if the flexible resources (or reserved resources) are indicated in units of symbols, it can be a hierarchical structure in which the radio frame / subframe / time slot position in which the corresponding symbol is located is separately indicated. For example, the reserved resources can be configured by configuration information including a time slot level bitmap and a symbol level bitmap, and the reserved resources can be one or more symbols reserved based on the symbol level bitmap in one or more time slots reserved based on the time slot level bitmap. And / or, the time slot level bitmap can be set in units of 10 milliseconds (ms) and / or 40ms. For example, a 10ms time slot level bitmap can be configured to indicate or represent whether a time slot of 10ms is reserved, and a symbol level bitmap can be configured to indicate or represent whether a symbol in each time slot reserved in the 10ms time slot level bitmap is reserved. In other words, the base station can configure the reserved resources to the UE in a hierarchical manner.

[0340] And / or, the corresponding unit and minimum / maximum value range may vary according to a cyclic prefix (CP) length of a corresponding system.

[0341] The indication method may be configured for each NB or NB-IoT carrier, and / or when no special configuration is indicated, the UE may expect that the indication method is not configured independently for each NB or NB-IoT carrier.

[0342] In a cell-specific RRC configuration or a UE-specific RRC configuration, flexible resources indicated in units of subframes / time slots / symbols may be limited to resources of non-bandwidth-reduced low complexity (BL) / coverage enhancement (CE) subframes or active subframes. This may be a method for providing Rel-16 LTE IoT UEs with the ability to dynamically and opportunistically / limitedly utilize resources that are only selected as resources that cannot be utilized by existing LTE IoT UEs because the existing LTE IoT UEs cannot dynamically utilize the corresponding flexible resources.

[0343] Using the above features, the bit size of the flexible resource can be determined according to the value of "0" or "1" indicated in the BL / CE subframe or valid subframe bitmap.

[0344] And / or, the base station may configure flexible resources differently via two methods, and the UE may select them. For example, the base station may configure flexible resources differently via cell-specific RRC signaling and UE-specific RRC signaling, and the UE may select them. For example, the UE selection may be based on UE capability reporting, or based on preferences reported to the base station from the UE's perspective via uplink channels and / or uplink signals. The base station may schedule downlink transmissions or desired uplink receptions based on the UE's requested capabilities or preferences.

[0345] And / or, the base station may configure flexible resources in units of time slots (or subframes) via cell-specific RRC signaling only when all symbols within a time slot (or subframe) can be configured as flexible resources, and may configure flexible resources in units of symbols via UE-specific RRC signaling when only some symbols within a time slot (or subframe) can be configured as flexible resources.

[0346] In this case, if flexible resources in symbol units are available, the UE can perform uplink / downlink transmission / reception using the flexible resources configured via UE-specific RRC signaling after the UE capability report / preference report (after approval by the base station). In addition to the flexible resources configured via cell-specific RRC signaling, UE-specific RRC signaling can also be used to configure additional available flexible resources or to limit some of the flexible resources configured via cell-specific RRC signaling through UE-specific RRC signaling.

[0347] Second embodiment

[0348] Next, a method for managing reserved resources is described.

[0349] Flexible resources (or reserved resources) may be managed or allocated to each channel / signal in the following manner.

[0350] (1)(N)PRACH

[0351] If random access (RA) resources are included in an UL slot and / or UL subframe including flexible resources, physical random access channel (PRACH) transmission may not be allowed in the corresponding UL subframe and / or UL slot, but the UE may consider that (N)PRACH is actually transmitted in the corresponding duration and may count the number of (N)PRACH repetition transmissions. In the present disclosure, PRACH may refer to a narrowband physical random access channel (NPRACH) or include PRACH and NPRACH.

[0352] Exceptionally, if flexible resources within the RA resources are indicated as UL through a dynamic method (e.g., via cell-specific DCI, group-common DCI, and / or UE-specific DCI), (N)PRACH transmission may be allowed. This may be exceptionally allowed only when PRACH transmission based on PDCCH commands is performed.

[0353] And / or, if (N)PRACH transmission is performed based on a PDCCH command, the flexible resource configuration may be ignored. That is, it can be understood that the base station indicates the intention of PRACH transmission via the physical downlink control channel (PDCCH) to change the flexible resources to UL. However, if the UE fails to receive the RAR and retransmits the PRACH after the (N)PRACH transmission based on the PDCCH command, the UE may be allowed to transmit the PRACH only to the RA resources that do not include the flexible resources configured by the higher layer.

[0354] (2)PDCCH

[0355] Flexible subframes / flexible slots can be handled by puncturing in the PDCCH candidate configuration.

[0356] In the LTE IoT PDCCH that can be monitored by UEs prior to Rel-16, the actual transmission of the LTE IoT PDCCH is omitted in the subframes / time slots including flexible resources, but the LTE IoT PDCCH can be considered to be transmitted in the counting of the number of repeated transmissions. For example, the LTE IoT PDCCH that can be monitored by UEs prior to Rel-16 can be punctured. In the present disclosure, the LTE IoT PDCCH can be referred to as the MTC Physical Downlink Control Channel (MPDCCH) and / or the Narrowband Physical Downlink Control Channel (NPDCCH).

[0357] In the LTE IoT PDCCH that a UE higher than Rel-16 can monitor UE-specifically, actual transmission of the LTE IoT PDCCH is omitted in subframes / time slots including flexible resources, and the LTE IoT PDCCH may be considered as not being transmitted even in counting the number of repeated transmissions. For example, the LTE IoT PDCCH that a UE higher than Rel-16 can monitor UE-specifically may be deferred and / or postponed.

[0358] (3)PDSCH / PUSCH

[0359] When scheduling the physical downlink shared channel (PDSCH) and / or physical uplink shared channel (PUSCH), whether flexible subframes / flexible time slots are included can be indicated. Alternatively, puncturing or deferral can be additionally indicated. For example, whether flexible resources are included and whether puncturing or deferral is indicated can be indicated.

[0360] If periodic transmission has been configured, but the DCI that schedules it is not sent before each transmission (e.g., SPS, PUCCH for CSI reporting, etc.), the corresponding transmission can be omitted in the subframe / time slot that includes flexible resources. In the above, SPS, PUCCH, and CSI can represent semi-persistent scheduling, physical uplink control channel, and channel state information, respectively.

[0361] The PDSCH and / or PUSCH dynamically scheduled to the DCI through the UE-specific search space (USS) can indicate whether the subframe / time slot including flexible resources in the scheduling grant is used for the corresponding transmission / reception. This indication can be implemented by an independent field within the scheduling DCI, or indirectly implemented by the length value of the repeated transmission duration or the number of repetitions of the scheduled channel. In addition, whether it is possible to indicate whether the subframe / time slot including flexible resources in the scheduling DCI is used for transmission / reception can be distinguished according to the CE level and / or CE mode of the corresponding UE.

[0362] Other channels / signals

[0363] Without distinction such as released in wake-up signal (WUS), resynchronization signal (RS), paging PDCCH / PDSCH and / or multicast PDCCH / PDSCH, the transmission of cell-specific configured channels / signals can be omitted in subframes / time slots including flexible resources, and the cell-specific configured channels / signals can be considered to be transmitted in terms of repetition number counting. For example, the cell-specific configured channels / signals can be punctured.

[0364] Flexible resource configuration may not apply to subframes / time slots / symbols in which information such as the primary synchronization signal (PSS), secondary synchronization signal (SSS), physical broadcast channel (PBCH) and / or system information block (SIB) is transmitted. The corresponding duration may not be included in the flexible resource configuration field from the beginning.

[0365] Since examples of the embodiments described in the present disclosure may be included as one of methods of implementing the present disclosure, it is apparent that the examples may be considered as the embodiments.

[0366] As described above, the embodiments described in this disclosure can be implemented independently, but some embodiments can be implemented in a combined (merged) form. The rules can be defined and / or configured so that the base station notifies the UE of information on whether an embodiment is applied (or information on the rules of the embodiment) via predefined signaling (e.g., physical layer signaling and / or high layer signaling, etc.).

[0367] Figure 25is a flowchart illustrating an operating method of a UE described in the present disclosure.

[0368] Reference Figure 25 First, in S2501, UE( Figures 27 to 31 1000 / 2000) can receive resource reservation configuration information (e.g., ResourceReservationConfig) from a base station, including first information and second information, the first information including a time slot level bitmap (e.g., slotBitmap) related to the reserved resources, and the second information including a symbol level bitmap (e.g., symbolBitmap) related to the reserved resources.

[0369] For example, the reserved resources may be one or more symbols reserved based on a symbol-level bitmap in one or more time slots reserved based on a time slot-level bitmap. And / or, the time slot-level bitmap may be set in units of 10 milliseconds (ms) and / or 40 ms. For example, a 10 ms time slot-level bitmap may be configured to indicate or represent whether a time slot of 10 ms is reserved, and a symbol-level bitmap may be configured to indicate or represent whether a symbol in each time slot reserved in the 10 ms time slot-level bitmap is reserved. In other words, according to the present disclosure, the base station may configure the reserved resources to the UE in a hierarchical manner. For example, the reserved resources may be resources in units of symbols, time slots, subframes, and / or radio frames.

[0370] And / or, the method according to the present disclosure may be performed in a wireless communication system supporting the Internet of Things (IoT). For example, IoT may include machine type communication (MTC) and / or narrowband IoT (NB-IoT).

[0371] For example, if the IoT is MTC, resource reservation configuration information may be configured for each narrowband. And / or if the IoT is NB-IoT, resource reservation configuration information may be configured for each NB-IoT carrier.

[0372] And / or, the resource reservation configuration information may be received via radio resource control (RRC) signaling.

[0373] For example, the operation of the UE receiving the resource reservation configuration information in step S2501 may be performed by the following method. Figures 27 to 31 For example, refer to Figure 28 , the one or more processors 1020 may control the one or more memories 1040 and / or the one or more RF units 1060 to receive the resource reservation configuration information, and the one or more RF units 1060 may receive the resource reservation configuration information.

[0374] And / or, in S2502, UE( Figures 27 to 311000 / 2000) can receive downlink control information (DCI) including indication information related to the use of reserved resources (e.g., resource reservation field) from the base station. For example, if the indication information is "0", the reserved resources based on the resource reservation configuration information can be used for the UE to receive downlink information. If the indication information is "1", the reserved resources based on the resource reservation configuration information cannot be used for the UE to receive downlink information. In this article, the reserved resources can be resources in units of symbols, time slots, subframes and / or radio frames.

[0375] Alternatively, the indication information may be information related to the use of the resource reservation configuration information. For example, if the indication information is "0," downlink information may be received without using the resource reservation configuration information. If the indication information is "1," downlink information may be received using the resource reservation configuration information.

[0376] For example, the operation of the UE receiving the DCI in step S2502 may be performed by Figures 27 to 31 For example, refer to Figure 28 , the one or more processors 1020 may control the one or more memories 1040 and / or the one or more RF units 1060 to receive the DCI, and the one or more RF units 1060 may receive the DCI.

[0377] And / or, in S2503, UE( Figures 27 to 31 1000 / 2000) can receive downlink information from the base station based on the resource reservation configuration information and indication information.

[0378] For example, based on the indication information including an indication related to the use of reserved resources, the reserved resources may be used to receive downlink information. In other words, if the indication information includes an indication that the reserved resources are available, the UE may expect to receive downlink information in the reserved resources. And / or, based on the indication information including an indication related to the reservation of reserved resources, the downlink information may be received without using the reserved resources. In other words, if the indication information includes an indication that the reserved resources are unavailable, the UE may not expect to receive downlink information in the reserved resources. For example, the reservation of reserved resources may mean that the reserved resources have already been reserved, or that the reserved resources have already been reserved without change.

[0379] And / or, based on the indication information including an indication related to the ability to use the reserved resources, the reserved resources may be used to receive the downlink information. As another example, based on the indication information including an indication related to the inability to use the reserved resources, the reserved resources may not be used to receive the downlink information. And / or, the downlink information may include information and / or signals transmitted and received on a channel.

[0380] For example, the downlink information may include synchronization signals (e.g., PSS / SSS / NPSS / NSSS, etc.) and / or reference signals (e.g., CSI-RS / DMRS / NRS / RRS, etc.), etc.

[0381] For example, downlink information may be received via a physical broadcast channel (PBCH) (e.g., PBCH / NPBCH), a physical downlink control channel (PDCCH) (e.g., PDCCH / NPDCCH / MPDCCH), and / or a physical downlink shared channel (PDSCH) (e.g., PDSCH / NPDSCH).

[0382] For example, the operation of the UE receiving the downlink information in step S2503 may be performed by Figures 27 to 31 For example, refer to Figure 28 , the one or more processors 1020 may control the one or more memories 1040 and / or the one or more RF units 1060 to receive downlink information, and the one or more RF units 1060 may receive the downlink information.

[0383] So far, although the above method has been described based on the downlink, it is obvious that the method according to the present disclosure can be applied to the uplink. For example, the resource reservation configuration information can be configuration information for reserving uplink resources. And / or, the UE and / or the base station can send and receive uplink information based on the configuration information for reserving uplink resources. For example, the uplink information can be information and / or signals sent and received via a physical random access channel (PRACH) (e.g., PRACH / NPRACH), a physical uplink control channel (PUCCH) and / or a physical uplink shared channel (PUSCH) (e.g., PUSCH / NPUSCH).

[0384] Due to the reference Figure 25 Describe UE operations and references Figures 1 to 24 The operations of the described UEs are the same, so their detailed descriptions are omitted.

[0385] The above signaling and operations can be performed by the devices described below (for example, Figures 27 to 31 ) is implemented. For example, the above signaling and operations can be implemented by Figures 27 to 31 The one or more processors 1010 and 2020 process, and the above signaling and operations can be used to run Figures 27 to 31 The instructions / programs (eg, commands, executable codes) of at least one processor (eg, 1010 and 2020) are stored in the memory (eg, 1040 and 2040).

[0386] For example, in an apparatus comprising one or more memories and one or more processors operatively connected to the one or more memories, the one or more processors may be configured to enable the apparatus to: receive resource reservation configuration information comprising first information and second information from a base station, the first information comprising a slot-level bitmap associated with reserved resources, the second information comprising a symbol-level bitmap associated with the reserved resources; receive downlink control information (DCI) comprising indication information associated with the use of the reserved resources from the base station; and receive downlink information from the base station based on the resource reservation configuration information and the indication information.

[0387] As another example, in a non-transitory computer-readable medium (CRM) storing one or more instructions, one or more instructions executable by one or more processors may allow a UE to: receive resource reservation configuration information including first information and second information from a base station, the first information including a slot-level bitmap related to reserved resources, and the second information including a symbol-level bitmap related to reserved resources; receive downlink control information (DCI) including indication information related to the use of reserved resources from the base station; and receive downlink information from the base station based on the resource reservation configuration information and the indication information.

[0388] Figure 26 is a flowchart illustrating an operating method of a base station described in the present disclosure.

[0389] Reference Figure 26 First, in S2601, the base station ( Figures 27 to 31 1000 / 2000) can send resource reservation configuration information (e.g., ResourceReservationConfig) including first information and second information to the UE, the first information including a time slot level bitmap (e.g., slotBitmap) related to the reserved resources, and the second information including a symbol level bitmap (e.g., symbolBitmap) related to the reserved resources.

[0390] For example, the reserved resources may be one or more symbols reserved based on a symbol-level bitmap in one or more time slots reserved based on a slot-level bitmap.

[0391] And / or, the slot-level bitmap can be set in units of 10 milliseconds (ms) and / or 40 ms. For example, the 10 ms slot-level bitmap can be configured to indicate or represent whether a 10 ms slot is reserved, and the symbol-level bitmap can be configured to indicate or represent whether a symbol in each slot reserved in the 10 ms slot-level bitmap is reserved. In other words, according to the present disclosure, the base station can hierarchically configure the reserved resources to the UE. For example, the reserved resources can be resources in units of symbols, slots, subframes, and / or radio frames.

[0392] And / or, the method according to the present disclosure may be performed in a wireless communication system supporting the Internet of Things (IoT). For example, IoT may include machine type communication (MTC) and / or narrowband IoT (NB-IoT).

[0393] For example, if the IoT is MTC, resource reservation configuration information may be configured for each narrowband. And / or if the IoT is NB-IoT, resource reservation configuration information may be configured for each NB-IoT carrier.

[0394] And / or, the resource reservation configuration information may be received via radio resource control (RRC) signaling.

[0395] For example, the operation of the base station sending the resource reservation configuration information in step S2601 may be performed by the following method. Figures 27 to 31 For example, refer to Figure 28 , the one or more processors 1020 may control the one or more memories 1040 and / or the one or more RF units 1060 to transmit the resource reservation configuration information, and the one or more RF units 1060 may transmit the resource reservation configuration information.

[0396] And / or, in S2602, the base station ( Figures 27 to 31 The UE may transmit downlink control information (DCI) including indication information related to the use of reserved resources (e.g., a resource reservation field) to the UE. For example, if the indication information is "0," the reserved resources based on the resource reservation configuration information may be used for the UE to receive downlink information. If the indication information is "1," the reserved resources based on the resource reservation configuration information cannot be used for the UE to receive downlink information. In this document, the reserved resources may be resources in units of symbols, time slots, subframes, and / or radio frames.

[0397] Alternatively, the indication information may be information related to the use of the resource reservation configuration information. For example, if the indication information is "0," downlink information may be received without using the resource reservation configuration information. If the indication information is "1," downlink information may be received using the resource reservation configuration information.

[0398] For example, the operation of the base station sending the DCI in step S2602 may be performed by the following method. Figures 27 to 31 For example, refer to Figure 28 , the one or more processors 1020 may control the one or more memories 1040 and / or the one or more RF units 1060 to transmit the DCI, and the one or more RF units 1060 may transmit the DCI.

[0399] And / or, in S2603, the base station ( Figures 27 to 31 1000 / 2000) can send downlink information to the UE based on the resource reservation configuration information and indication information.

[0400] For example, based on the indication information including an indication related to the use of reserved resources, the reserved resources may be used to send downlink information. In other words, if the indication information includes an indication that the reserved resources are available, the UE may expect to receive downlink information in the reserved resources. And / or, based on the indication information including an indication related to the reservation of reserved resources, the downlink information may be sent without using the reserved resources. In other words, if the indication information includes an indication that the reserved resources cannot be used, the UE may not expect to receive downlink information in the reserved resources. For example, the reservation of reserved resources may mean that the reserved resources have already been reserved, or that the reserved resources have already been reserved without change.

[0401] And / or, based on the indication information including an indication related to the ability to use the reserved resources, the reserved resources may be used to send the downlink information. And / or, based on the indication information including an indication related to the inability to use the reserved resources, the reserved resources may not be used to send the downlink information. And / or, the downlink information may include information and / or signals sent and received on the channel.

[0402] For example, the downlink information may include synchronization signals (e.g., PSS / SSS / NPSS / NSSS, etc.) and / or reference signals (e.g., CSI-RS / DMRS / NRS / RRS, etc.), etc.

[0403] For example, downlink information may be received via a physical broadcast channel (PBCH) (e.g., PBCH / NPBCH), a physical downlink control channel (PDCCH) (e.g., PDCCH / NPDCCH / MPDCCH), and / or a physical downlink shared channel (PDSCH) (e.g., PDSCH / NPDSCH).

[0404] For example, the operation of the base station transmitting the downlink information in step S2603 may be performed by the following method. Figures 27 to 31 For example, refer to Figure 28 , the one or more processors 1020 may control the one or more memories 1040 and / or the one or more RF units 1060 in order to transmit downlink information, and the one or more RF units 1060 may transmit the downlink information.

[0405] So far, although the above method has been described based on the downlink, it is obvious that the method according to the present disclosure can be applied to the uplink. For example, the resource reservation configuration information can be configuration information for reserving uplink resources. And / or, the UE and / or the base station can send and receive uplink information based on the configuration information for reserving uplink resources. For example, the uplink information can be information and / or signals sent and received via a physical random access channel (PRACH) (e.g., PRACH / NPRACH), a physical uplink control channel (PUCCH) and / or a physical uplink shared channel (PUSCH) (e.g., PUSCH / NPUSCH).

[0406] Due to the reference Figure 26 The operation of the base station is described with reference to Figures 1 to 25 The operations of the described base stations are the same, so their detailed description is omitted.

[0407] The above signaling and operations can be performed by the devices described below (for example, Figures 27 to 31 ) is implemented. For example, the above signaling and operations can be implemented by Figures 27 to 31 The one or more processors 1010 and 2020 process, and the above signaling and operations can be used to run Figures 27 to 31 The instructions / programs (eg, commands, executable codes) of at least one processor (eg, 1010 and 2020) are stored in the memory (eg, 1040 and 2040).

[0408] For example, in an apparatus comprising one or more memories and one or more processors operatively connected to the one or more memories, the one or more processors may be configured to allow the apparatus to: send resource reservation configuration information comprising first information and second information to a UE, the first information comprising a slot-level bitmap associated with reserved resources, the second information comprising a symbol-level bitmap associated with the reserved resources; send downlink control information (DCI) comprising indication information associated with the use of the reserved resources to the UE; and send downlink information to the UE based on the resource reservation configuration information and the indication information.

[0409] As another example, in a non-transitory computer-readable medium (CRM) storing one or more instructions, one or more instructions executable by one or more processors may allow a base station to: send resource reservation configuration information including first information and second information to a UE, the first information including a slot-level bitmap related to reserved resources, and the second information including a symbol-level bitmap related to reserved resources; send downlink control information (DCI) including indication information related to the use of reserved resources to the UE; and send downlink information to the UE based on the resource reservation configuration information and the indication information.

[0410] Examples of communication systems to which the present disclosure is applied

[0411] Although the present disclosure is not limited thereto, and the various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure disclosed in this document may also be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0412] Hereinafter, the communication system will be described in more detail with reference to the accompanying drawings. In the following drawings / descriptions, if there is no different description, the same reference numerals will refer to the same or corresponding hardware blocks, software blocks or functional blocks.

[0413] Figure 27 A communication system 10 applied to the present disclosure is illustrated.

[0414] Reference Figure 27 , the communication system 10 applied to the present disclosure includes a wireless device, a BS and a network. Here, the wireless device may mean a device that performs communication by using a radio access technology (for example, 5G New RAT (NR) or Long Term Evolution (LTE)), and may be represented as a communication / wireless / 5G device. Although the present disclosure is not limited to this, the wireless device may include a robot 100a, vehicles 1000b-1 and 1000b-2, an extended reality (XR) device 1000c, a handheld device 1000d, a home appliance 1000e, an Internet of Things (IoT) device 1000f and an AI device / server 4000. For example, the vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, etc. Here, the vehicle may include an unmanned aerial vehicle (UAV) (for example, a drone). XR devices include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and can be implemented in the form of a head-up display (HUD), a head-mounted device (HMD), etc., such as provided in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. Handheld devices may include smartphones, smart tablets, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebooks), etc. Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a base station or a network may even be implemented as a wireless device, and a specific wireless device 2000a may operate as a base station / network node for another wireless device.

[0415] Wireless devices 1000a to 1000f can connect to network 3000 via base station 2000. Artificial intelligence (AI) technology can be applied to wireless devices 1000a to 1000f, and wireless devices 1000a to 1000f can connect to AI server 4000 via network 3000. Network 3000 can be configured using a 3G network, a 4G network (e.g., LTE), a 5G network (e.g., NR), or the like. Wireless devices 1000a to 1000f can communicate with each other via base station 2000 / network 3000, but can also communicate directly with each other (sidelink communication) without going through the base station / network. For example, vehicles 1000b-1 and 1000b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). Furthermore, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices 1000a to 1000f.

[0416] Wireless communication / connection 1500a, 1500b, and 1500c can be performed between wireless devices 1000a to 1000f and base station 2000, and between base station 2000 and base station 2000. Here, wireless communication / connection can be performed through various radio access technologies (e.g., 5G NR), such as uplink / downlink communication 1500a, sidelink communication 1500b (or D2D communication), and inter-base station communication 1500c (e.g., relay, integrated access backhaul (IAB)). The wireless device and base station / wireless device and base station and base station can send / receive radio signals to each other through wireless communication / connection 1500a, 1500b, or 1500c. For example, wireless communication / connection 1500a, 1500b, or 1500c can send / receive signals through various physical channels. To this end, at least some of the various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), resource allocation processes, etc. can be performed based on the various proposals of the present disclosure.

[0417] Examples of wireless devices to which the present disclosure is applied

[0418] Figure 28 A wireless device that can be applied to the present disclosure is illustrated.

[0419] Reference Figure 28 , the first wireless device 1000 and the second wireless device 2000 can transmit and receive radio signals through various radio access technologies (e.g., LTE, NR). Here, the first wireless device 1000 and the second wireless device 2000 can be connected to Figure 27The wireless device 1000x and the base station 2000 and / or the wireless device 1000x and the wireless device 1000x correspond to each other.

[0420] The first wireless device 1000 includes one or more processors 1020 and one or more memories 1040, and may additionally include one or more transceivers 1060 and / or one or more antennas 1080. The processor 1020 may control the memory 1040 and / or the transceiver 1060 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure. For example, the processor 1020 may process information in the memory 1040 and generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 1060. In addition, the processor 1020 may receive a radio signal including second information / signals through the transceiver 1060, and may then store information obtained through signal processing of the second information / signals in the memory 1040. The memory 1040 may be connected to the processor 1020 and may store various types of information related to the operation of the processor 1020. For example, the memory 1040 may store software code including instructions for executing some or all of the processing controlled by the processor 1020 or executing the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this disclosure. Here, the processor 1020 and the memory 1040 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE or NR). The transceiver 1060 may be connected to the processor 1020 and may send and / or receive radio signals through one or more antennas 1080. The transceiver 1060 may include a transmitter and / or a receiver. The transceiver 1060 may be mixed with a radio frequency (RF) unit. In the present disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0421] The second wireless device 2000 includes one or more processors 2020 and one or more memories 2040, and may additionally include one or more transceivers 2060 and / or one or more antennas 2080. The processor 2020 may control the memory 2040 and / or the transceiver 2060 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this disclosure. For example, the processor 2020 may process information in the memory 2040 and generate third information / signals, and may then transmit a radio signal including the third information / signals through the transceiver 2060. In addition, the processor 2020 may receive a radio signal including fourth information / signals through the transceiver 2060, and may then store information obtained through signal processing of the fourth information / signals in the memory 2040. The memory 2040 may be connected to the processor 2020 and may store various types of information related to the operation of the processor 2020. For example, the memory 2040 may store software code including instructions for executing some or all of the processing controlled by the processor 2020 or executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure. Here, the processor 2020 and the memory 2040 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE or NR). The transceiver 2060 may be connected to the processor 2020 and may send and / or receive radio signals through one or more antennas 2080. The transceiver 2060 may include a transmitter and / or a receiver. The transceiver 2060 may be mixed with an RF unit. In this disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0422] Hereinafter, the hardware elements of the wireless devices 1000 and 2000 will be described in more detail. Although the present disclosure is not limited thereto, one or more protocol layers may be implemented by one or more processors 1020, 2020. For example, one or more processors 1020, 2020 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 1020, 2020 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in the disclosure. One or more processors 1020, 2020 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in the disclosure. One or more processors 1020, 2020 may generate a signal (e.g., a baseband signal) including a PDU, an SDU, a message, control information, data, or information according to the functions, processes, proposals, and / or methods disclosed in the present disclosure, and may provide the signal to one or more transceivers 1060, 2060. One or more processors 1020, 2020 may receive a signal (e.g., a baseband signal) from one or more transceivers 1060, 2060, and may obtain the PDU, SDU, message, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in the present disclosure.

[0423] The one or more processors 1020 and 2020 may be represented as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 1020 and 2020 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in the one or more processors 1020 and 2020. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure may be included in the one or more processors 1020 and 2020, or may be stored in one or more memories 1040 and 2040 and driven by the one or more processors 1020 and 2020. The descriptions, functions, processes, proposals, methods and / or operational flowcharts disclosed in this disclosure may be implemented in the form of codes, instructions and / or instruction sets using firmware or software.

[0424] One or more memories 1040 and 2040 can be connected to one or more processors 1020 and 2020 and can store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 1040 and 2040 can be configured by ROM, RAM, EPROM, flash memory, hard disk drive, registers, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 1040 and 2040 can be located inside and / or outside one or more processors 1020 and 2020. In addition, one or more memories 1040 and 2040 can be connected to one or more processors 1020 and 2020 using various technologies such as wired or wireless connections.

[0425] One or more transceivers 1060 and 2060 can transmit user data, control information, wireless signals / channels, and the like described in the methods and / or operational flowcharts of this disclosure to one or more other devices. One or more transceivers 1060 and 2060 can also receive user data, control information, wireless signals / channels, and the like described in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure from one or more other devices. For example, one or more transceivers 1060 and 2060 can be connected to one or more processors 1020 and 2020 and can transmit and receive radio signals. For example, one or more processors 1020 and 2020 can control one or more transceivers 1060 and 2060 to transmit user data, control information, or radio signals to one or more other devices. Furthermore, one or more processors 1020 and 2020 can control one or more transceivers 1060 and 2060 to receive user data, control information, or radio signals from one or more other devices. In addition, one or more transceivers 1060 and 2060 can be connected to one or more antennas 1080 and 2080, and one or more transceivers 1060 and 2060 can be configured to transmit and receive user data, control information, wireless signals / channels, etc. described in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure through one or more antennas 1080 and 2080. In this disclosure, one or more antennas can be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 1060 and 2060 can convert received radio signals / channels from RF band signals to baseband signals to process the received user data, control information, radio signals / channels, etc. by using one or more processors 1020 and 2020. One or more transceivers 1060 and 2060 can convert user data, control information, radio signals / channels, etc. processed by using one or more processors 1020 and 2020 from baseband signals to RF band signals. To this end, one or more transceivers 1060 and 2060 may include (analog) oscillators and / or filters.

[0426] Examples of signal processing circuits to which the present disclosure is applied

[0427] Figure 29 A signal processing circuit for transmitting a signal is illustrated.

[0428] Reference Figure 29 , the signal processing circuit 10000 may include a scrambler 10100, a modulator 10200, a layer mapper 10300, a precoder 10400, a resource mapper 10500, and a signal generator 10600. Although not limited thereto, Figure 29The operations / functions can be performed by Figure 28 The processors 1020 and 2020 and / or the transceivers 1060 and 2060 are used for execution. Figure 29 The hardware components can be Figure 28 1020 and 2020 and / or transceivers 1060 and 2060. For example, blocks 10100 to 10600 may be implemented in Figure 28 In addition, blocks 10100 to 10500 may be implemented in processors 1020 and 2020. Figure 28 1020 and 2020, and block 10600 may be implemented in Figure 28 is implemented in transceivers 1060 and 2060.

[0429] Codewords can be passed Figure 29 The signal processing circuit 10000 is converted into a radio signal. Here, a codeword is a coded bit sequence of an information block. An information block may include a transport block (e.g., a UL-SCH transport block and a DL-SCH transport block). The radio signal can be transmitted via various physical channels (e.g., PUSCH and PDSCH).

[0430] Specifically, the codeword can be converted into a bit sequence scrambled by the scrambler 10100. A scrambling sequence for scrambling can be generated based on an initialization value, and the initialization value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 10200. The modulation scheme may include pi / 2-BPSK (pi / 2-binary phase shift keying), m-PSK (m-phase shift keying), m-QAM (m-quadrature amplitude modulation), etc. The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 10300. The modulation symbol of each transmission layer can be mapped to the corresponding antenna port (precoding) by the precoder 10400. The output z of the precoder 10400 can be obtained by multiplying the output y of the layer mapper 10300 by the N*M precoding matrix W. Here, N represents the number of antenna ports and M represents the number of transmission layers. Here, the precoder 10400 can perform precoding after performing transform precoding (e.g., DFT transform) on the complex modulation symbols. In addition, the precoder 10400 can perform precoding without performing transform precoding.

[0431] The resource mapper 10500 can map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include multiple symbols (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. The signal generator 10600 can generate a radio signal from the mapped modulation symbols, and the generated radio signal can be sent to another device through each antenna. To this end, the signal generator 10600 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

[0432] Can be used with Figure 25 The signal processing process of the received signal in the wireless device is configured in the opposite manner to the signal processing process (10100 to 10600). For example, the wireless device (e.g., Figure 24 1000 or 2000) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal reconstructor. To this end, the signal reconstructor may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Thereafter, the baseband signal can be reconstructed into a codeword through resource demapper processing, post-coding processing, demodulation processing, and descrambling processing. The codeword can be reconstructed into the original information block by decoding. Therefore, the signal processing circuit (not shown) for receiving the signal may include a signal reconstructor, a resource demapper, a post-coder, a demodulator, a descrambler, and a decoder.

[0433] Usage examples of wireless devices to which the present disclosure is applied

[0434] Figure 30 Another example of a wireless device to which the present disclosure is applied is illustrated.

[0435] The wireless device may be implemented in various forms according to use cases / services (see Figure 27 ). Reference Figure 30 , wireless devices 1000 and 2000 and Figure 29 The wireless devices 1000 and 2000 correspond to each other and may be composed of various elements, components, units and / or modules. For example, the wireless devices 1000 and 2000 may include a communication unit 1100, a control unit 1200, a memory unit 1300 and an additional component 1400. The communication unit may include a communication circuit 1120 and a transceiver 1140. For example, the communication circuit 1120 may include Figure 22 One or more processors 1020 and 2020 and / or one or more memories 1040 and 2040. For example, the transceiver 1140 may include Figure 22The one or more transceivers 1060 and 2060 and / or one or more antennas 1080 and 2080 of the wireless device are connected to the communication unit 1100, the memory unit 1300, and the additional components 1400, and control the overall operation of the wireless device. For example, the control unit 1200 can control the electrical / mechanical operation of the wireless device based on the program / code / instructions / information stored in the memory unit 1300. In addition, the control unit 1200 can transmit information stored in the memory unit 1300 to the outside (e.g., another communication device) via a wireless / wired interface through the communication unit 1100, or can store information received from the outside (e.g., another communication device) via the wireless / wired interface through the communication unit 1100.

[0436] The additional component 1400 may be configured in various ways depending on the type of the wireless device. For example, the additional component 1400 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a driving unit, and a computing unit. Although the present disclosure is not limited thereto, the wireless device may be configured in various ways such as Figure 27 Robot 1000a in Figure 27 Vehicles 1000b-1 and 1000b-2, Figure 27 The XR device 1000c in Figure 27 The handheld device 1000d, Figure 27 Home appliances 1000e, Figure 27 IoT devices 1000f, digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, weather / environmental devices, Figure 27 AI server / device 4000, Figure 27 The wireless device may be implemented in the form of a base station 2000, a network node, etc. Depending on the use case / service, the wireless device may be mobile or used in a fixed place.

[0437] exist Figure 30In the wireless devices 1000 and 2000, all of the various elements, components, and / or modules within them can be interconnected via a wired interface, or at least wirelessly connected via the communication unit 1100. For example, the control unit 1200 and the communication unit 1100 in the wireless devices 1000 and 2000 can be wired, and the control unit 1200 and the first unit (e.g., 1300 or 1400) can be wirelessly connected via the communication unit 1100. In addition, the elements, components, units, and / or modules in the wireless devices 1000 and 2000 can further include one or more components. For example, the control unit 1200 can be composed of a collection of one or more processors. For example, the control unit 1200 can be configured as a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, or a memory control processor. As another example, the memory unit 1300 can be configured as a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0438] Figure 31 A portable device to which the present disclosure is applied is exemplified.

[0439] Portable devices may include smart phones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and portable computers (e.g., notebooks). Portable devices may be denoted as mobile stations (MS), user terminals (UTs), mobile subscriber stations (MSSs), subscriber stations (SSs), advanced mobile stations (AMSs), or wireless terminals (WTs).

[0440] Reference Figure 31 , the portable device 1000 may include an antenna unit 1080, a communication unit 1100, a control unit 1200, a memory unit 1300, a power supply unit 1400a, an interface unit 1400b, and an input / output (I / O) unit 1400c. The antenna unit 1080 may be configured as a part of the communication unit 1100. Blocks 1100 to 1300 / 1400a to 1400c are respectively Figure 30 Corresponding to blocks 1100 to 1300 / 1400.

[0441] The communication unit 1100 can send and receive signals (e.g., data or control signals) to and from other wireless devices or base stations. The control unit 1200 can perform various operations by controlling the components of the portable device 1000. The control unit 1200 may include an application processor (AP). The memory unit 1300 can store the data / parameters / programs / codes / instructions required to drive the portable device 1000. In addition, the memory unit 1300 can store input / output data / information, etc. The power supply unit 1400a supplies power to the portable device 1000 and may include a wired / wireless charging circuit, a battery, etc. The interface unit 1400b can support connection between the portable device 1000 and another external device. The interface unit 1400b may include various ports for connecting to external devices (e.g., audio input / output ports and video input / output ports). The input / output unit 1400c can receive or output image information / signals, audio information / signals, data and / or information input from the user. The input / output unit 1400 c may include a camera, a microphone, a user input unit, a display 1400 d , a speaker, and / or a haptic module.

[0442] As an example, in the case of data communication, the input / output unit 1400c can obtain information / signals (e.g., touch, text, voice, image, or video) input from the user, and the obtained information / signals can be stored in the memory unit 1300. The communication unit 1100 can convert the information / signals stored in the memory into radio signals, and can directly transmit the radio signals to another wireless device, or can transmit the radio signals to a BS. In addition, the communication unit 1100 can receive a radio signal from another wireless device or a base station, and then reconstruct the received radio signal into the original information / signal. The reconstructed information / signal can be stored in the memory unit 1300 and output in various forms (e.g., text, voice, image, video, and tactile) through the input / output unit 1400c.

[0443] In addition to LTE, NR and 6G, the wireless communication technology implemented by the wireless devices (e.g., 1000, 2000, 1000a to 1000f) according to the present disclosure may include narrowband Internet of Things for low-power communication. In this case, for example, NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology and may be implemented by standards such as LTE Cat NB1 and / or LTE Cat NB2, and the present disclosure is not limited to the foregoing names. Additionally or alternatively, the wireless communication technology implemented by the wireless devices (e.g., 1000, 2000, 1000a to 1000f) according to the present disclosure may perform communication based on LTE-M technology. In this case, for example, LTE-M technology may be an example of an LPWAN technology and may be referred to as various names, such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine type communication, and / or 7) LTE M, and the present disclosure is not limited to the aforementioned names. Additionally or alternatively, considering low-power communication, the wireless communication technology implemented by the wireless devices (e.g., 1000, 2000, 1000a to 1000f) according to the present disclosure may include at least one of ZigBee, Bluetooth, and a low-power wide area network (LPWAN), and the present disclosure is not limited to the aforementioned names. For example, ZigBee technology can generate a personal area network (PAN) related to small / low-power digital communication based on various standards such as IEEE 802.15.4 and can be referred to by various names.

[0444] In the aforementioned embodiments, the components and features of the present disclosure have been combined in a specific form. Unless otherwise expressly stated, each component or function should be considered as an option. Each component or feature can be implemented as not being associated with other components or features. In addition, the embodiments of the present disclosure can be configured by associating some components and / or features. The order of the operations described in the embodiments of the present disclosure can be changed. Some components or features of any embodiment can be included in another embodiment, or some components or features of the embodiment can be replaced by corresponding components or features of another embodiment. Obviously, an embodiment can be formed by combining claims that do not have a clear reference relationship in the claims, or it can be included in a new claim by amendment after submitting this application.

[0445] The embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc. may be used to implement the example embodiments described herein, depending on the hardware implementation.

[0446] In the case of implementation by firmware or software, the embodiments of the present disclosure may be implemented in the form of modules, processes, or functions for performing the aforementioned functions or operations. The software code may be stored in a memory and driven by a processor. The memory may be located inside or outside the processor and may exchange data with the processor in various known ways.

[0447] It is obvious to those skilled in the art that the present disclosure may be implemented in other specific forms without departing from the essential features of the present disclosure. Therefore, the foregoing detailed description should not be interpreted as limiting in all aspects, but should be interpreted as illustrative. The scope of the present disclosure should be determined by a reasonable analysis of the appended claims, and all modifications within the equivalent range of the present disclosure are included within the scope of the present disclosure.

[0448] Industrial Applicability

[0449] Although the present disclosure has focused on an example applied to a 3GPP LTE / LTE-A system to describe a method for transmitting and receiving downlink information in a wireless communication system supporting the Internet of Things (IoT) (e.g., MTC, NB-IoT), the present disclosure can be applied to various wireless communication systems other than the 3GPP LTE / LTE-A system, such as a 5G system.

Claims

1. A method for receiving downlink information by a user equipment (UE) in a wireless communication system supporting the Internet of Things (IoT), the method comprising the following steps: receiving resource reservation configuration information from a base station via higher layer signaling, the resource reservation configuration information comprising: (i) a slot-level bitmap associated with a reserved time slot, and (ii) a symbol-level bitmap associated with a reserved symbol within the reserved time slot; receiving, from the base station, downlink control information (DCI) including a resource reservation field indicating whether to use reserved resources; determining a downlink subframe or symbol region as a downlink resource based on the resource reservation configuration information and the resource reservation field in the DCI, wherein, based on the resource reservation field being set to "0", the reserved resources are included in the downlink resources, and wherein, based on the resource reservation field being set to "1", the reserved resources are excluded from the downlink resources only when all OFDM symbols in the reserved time slot are indicated as reserved by the symbol-level bitmap; and Downlink information is received from the base station based on the determined downlink resources.

2. The method according to claim 1, wherein The reserved resources are one or more symbols reserved in the reserved time slot based on the symbol-level bitmap.

3. The method according to claim 1, wherein The slot level bitmap is set in units of 10ms or 40ms.

4. The method according to claim 1, wherein The resource reservation configuration information is configured for each NB-IoT carrier.

5. The method according to claim 1, wherein The downlink information is received via a physical downlink shared channel (PDSCH).

6. A user equipment (UE) configured to receive downlink information in a wireless communication system supporting the Internet of Things (IoT), the UE comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and storing instructions that, upon execution by the at least one processor, perform operations comprising: receiving resource reservation configuration information from a base station via higher layer signaling, the resource reservation configuration information comprising: (i) a slot-level bitmap associated with a reserved time slot, and (ii) a symbol-level bitmap associated with a reserved symbol within the reserved time slot; receiving, from the base station, downlink control information (DCI) including a resource reservation field indicating whether to use reserved resources; determining a downlink subframe or symbol region as a downlink resource based on the resource reservation configuration information and the resource reservation field in the DCI, wherein, based on the resource reservation field being set to "0", the reserved resources are included in the downlink resources, and wherein, based on the resource reservation field being set to "1", the reserved resources are excluded from the downlink resources only when all OFDM symbols in the reserved time slot are indicated as reserved by the symbol-level bitmap; and Downlink information is received from the base station based on the determined downlink resources.

7. A method for transmitting downlink information by a base station in a wireless communication system supporting the Internet of Things (IoT), the method comprising the following steps: Sending resource reservation configuration information to a user equipment (UE) via higher layer signaling, the resource reservation configuration information comprising: (i) a slot-level bitmap associated with a reserved time slot, and (ii) a symbol-level bitmap associated with a reserved symbol within the reserved time slot; sending downlink control information (DCI) including a resource reservation field indicating whether to use reserved resources to the UE; and sending downlink information to the UE based on downlink resources, wherein, based on the resource reservation configuration information and the resource reservation field in the DCI, a downlink subframe or symbol region is determined as the downlink resource, wherein, based on the resource reservation field being set to "0", the reserved resources are included in the downlink resources, and Wherein, based on the resource reservation field being set to "1", the reserved resources are excluded from the downlink resources only when all OFDM symbols in the reserved time slot are indicated as reserved through the symbol-level bitmap.

8. The method according to claim 7, wherein: The reserved resources are one or more symbols reserved based on the symbol-level bitmap in the time slot reserved based on the time slot-level bitmap.

9. The method according to claim 7, wherein: The slot level bitmap is set in units of 10ms or 40ms.

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