Method, apparatus and system for resource allocation of a wireless communication system

Abstract

The present invention relates to a resource allocation method, apparatus, and system of a wireless communication system. Disclosed is a terminal of a wireless communication system and a wireless communication method using the same. More specifically, disclosed is a method and an apparatus thereof, the method including the steps of receiving scheduling information including resource allocation information, wherein the resource allocation information includes RIV determined based on the number of RBs of a first BWP; and transmitting or receiving data on a RB set corresponding to the RIV on a second BWP, wherein if the number of RBs of the second BWP is greater than the number of RBs of the first BWP, a start RB index S of the RB set corresponding to the RIV on the second BWP and the number L of RBs in the RB set are given in units of powers of 2.

Description

[0001] This application is a divisional application of patent application No. 201980008079.3 (PCT / KR2019 / 000560) with the international filing date of January 14, 2019, filed in the Chinese Patent Office on July 10, 2020, the title of the invention being "Resource allocation method, apparatus and system for wireless communication system". TECHNICAL FIELD

[0002] The present application relates to a wireless communication system. More specifically, the present application relates to a wireless communication method, device and system for transmitting and receiving a data channel and a control channel. BACKGROUND

[0003] After the commercialization of the fourth generation (4G) communication system, efforts are being made to develop a new fifth generation (5G) communication system to meet the increasing demand for wireless data traffic. The 5G communication system is also called a beyond 4G network communication system, a post LTE system, or a new radio (NR) system. To achieve a high data transmission rate, the 5G communication system includes a system using a millimeter wave (mmWave) band of 6 GHz or more and a communication system using a frequency band of 6 GHz or less in terms of securing coverage, so that implementation in the base station and the terminal is considered.

[0004] The third generation partnership project (3GPP) NR system improves the spectral efficiency of the network and enables communication providers to provide more data and voice services on a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to supporting a large number of voice. The advantage of the NR system is to have a higher throughput and a lower latency on the same platform, to support frequency division duplex (FDD) and time division duplex (TDD), and to have a low operating cost due to an enhanced end user environment and a simple architecture.

[0005] For more efficient data processing, dynamic TDD of the NR system can use a method for changing the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used in the uplink and the downlink according to the data traffic direction of the cell user. For example, when the downlink traffic of the cell is greater than the uplink traffic, the base station can allocate a plurality of downlink OFDM symbols to a time slot (or a subframe). Information about the time slot configuration should be transmitted to the terminal.

[0006] To mitigate path loss of radio waves and increase the transmission distance of radio waves in the mmWave band, beamforming, massive multi-input / multi-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, hybrid beamforming combining analog beamforming and digital beamforming, and large scale antenna technology are discussed in the 5G communication system. In addition, for network improvement of the system, technology development related to evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non terrestrial network communication (NTN), mobile network, cooperative communication, coordinated multi-points (CoMP), interference mitigation, etc. are in progress in the 5G communication system. In addition, in the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), which are an advanced coding modulation (ACM) scheme, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA), which are an advanced connection technology, are being developed.

[0007] Meanwhile, the Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed components such as objects exchange information between each other. The Internet of Everything (IoE), which is a combination of the IoT technology and the big data processing technology through connection with a cloud server, has emerged as a new paradigm for the IoT. In order to implement the IoT, technology elements such as a sensing technology, wired / wireless communication and network infrastructure, service interface technology, and a security technology are required, and thus a technique of a sensor network, machine-to-machine (M2M), and machine type communication (MTC) has been recently researched. In the IoT environment, a smart internet technology (IT) service for collecting and analyzing generated data from objects connected with each other to create a new value in a human life is provided. The IoT can be applied to a field such as a smart home, a smart building, a smart city, a smart car or a connected car, a smart grid, health care, a smart home appliance, and an advanced medical service through the convergence and combination of the existing information technology (IT) and various industries.

[0008] Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, machine-to-machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna. The application of a cloud RAN, which is a big data processing technology described above, is an example of convergence of the 5G technology and the IoT technology. In general, a mobile communication system is developed to provide a voice service while ensuring the activity of users.

[0009] However, the mobile communication system not only expands a voice service but also expands a data service, and now has developed to the extent of providing a high-speed data service. However, in the mobile communication system which is currently providing a service, due to a resource shortage phenomenon and a high-speed service demand of users, a more advanced mobile communication system is required. SUMMARY

[0010] TECHNICAL PROBLEM

[0011] An object of the present application is to provide a method for efficiently transmitting and receiving a signal in a wireless communication system, particularly a cellular wireless communication system, and an apparatus therefor.

[0012] TECHNICAL SOLUTION

[0013] In order to solve the above problem, the following apparatus of a wireless communication system and wireless communication method are provided.

[0014] In a first aspect of the present application, a method performed by a UE in a wireless communication system includes receiving scheduling information including resource allocation information, wherein the resource allocation information includes a resource indication value (RIV) determined based on a number of resource blocks (RBs) of a first bandwidth part (BWP), and transmitting or receiving data on a set of RBs corresponding to the RIV in a second BWP, wherein if the number of RBs of the second BWP is greater than the number of RBs of the first BWP, a starting RB index S and a number of RBs L of the set of RBs corresponding to the RIV in the second BWP have one of the following values, respectively:

[0015] - the starting RB index S: {0, K, 2*K,..., (N BWP1 -1)*K}, and

[0016] - the number of RBs L: {K, 2*K, 3*K,..., N BWP1 *K}

[0017] where N BWP1 is the number of RBs of the first BWP, and K is a power of 2 and is determined based on (the number of RBs of the second BWP / the number of RBs of the first BWP).

[0018] In a second aspect of the present disclosure, a method performed by a base station in a wireless communication system includes transmitting scheduling information including resource allocation information, wherein the resource allocation information includes a resource indication value (RIV) determined based on a number of resource blocks (RBs) of a first bandwidth part (BWP), and transmitting or receiving data on a set of RBs corresponding to the RIV in a second BWP, wherein, if the number of RBs of the second BWP is greater than the number of RBs of the first BWP, a starting RB index S and a number of RBs L of the set of RBs corresponding to the RIV in the second BWP have one of the following values, respectively:

[0019] - starting RB index S: {0, K, 2*K,..., (N BWP1 -1)*K}, and

[0020] - number of RBs L: {K, 2*K, 3*K,..., N BWP1 *K}

[0021] where N BWP1 is the number of RBs of the first BWP, and K is a power of 2 and determined based on (the number of RBs of the second BWP / the number of RBs of the first BWP).

[0022] In the first and second aspects, the first BWP and the second BWP include one of the following:

[0023] - (first BWP, second BWP) = (initial BWP, active BWP), and

[0024] - (first BWP, second BWP) = (currently activated BWP, newly activated BWP),

[0025] where the currently activated BWP is an active BWP at a point in time when the scheduling information is received, and the newly activated BWP is a BWP indicated by a bandwidth part indicator (BPI) in the scheduling information.

[0026] In the first and second aspects, K has the following value according to (the number of RBs of the second BWP / the number of RBs of the first BWP):

[0027] 1<X<2 2≤X<4 4≤X<8 8≤X<16 ... 2 n ≤X<2 n+1 ]]> K 1 2 4 8 ... 2 n ]]

[0028] where X is (the number of RBs of the second BWP / the number of RBs of the first BWP), and n is an integer of 0 or more. In the first and second aspects, the RIV has a value satisfying the following equation:

[0029] - if (L'-1) ≤ floor(N BWP1 / 2), RIV = N BWP1 *(L'-1) + S', and

[0030] - if (L' - 1) > floor(N BWP1 / 2), RIV = N BWP1 *(N BWP1 - L' + 1) + (N BWP1 - 1 - S'),

[0031] where L' has a value of 1 ≤ L' ≤ N BWP1 - S' and S' is S / K.

[0032] In the first and second aspects, when the number of RBs of the second BWP is equal to or smaller than the number of RBs of the first BWP, the starting RB index S and the number of RBs L of the RB set corresponding to the RIV in the second BWP are given by one of the following values, respectively:

[0033] - the starting RB index S: {0, 1, 2,..., N BWP2 - 1}, and

[0034] - the number of RBs L: {1, 2, 3,..., N BWP2},

[0035] where N BWP2 is the number of RBs of the second BWP.

[0036] In a third aspect of the disclosure, an apparatus for use in a wireless communication system includes a memory and a processor, wherein the processor receives scheduling information including resource allocation information, wherein the resource allocation information includes a resource indication value (RIV) determined based on a number of resource blocks (RBs) of a first bandwidth part (BWP), and transmits or receives data on a RB set corresponding to the RIV in a second BWP, wherein if the number of RBs of the second BWP is greater than the number of RBs of the first BWP, a starting RB index S and a number of RBs L of the RB set corresponding to the RIV in the second BWP have one of the following values, respectively:

[0037] - the starting RB index S: {0, K, 2*K,..., (N BWP1 - 1)*K}, and

[0038] - the number of RBs L: {K, 2*K, 3*K,..., N BWP1 *K}

[0039] where N BWP1 is the number of RBs of the first BWP, and K is a power of 2 and is determined based on (the number of RBs of the second BWP / the number of RBs of the first BWP).

[0040] In a fourth aspect of the present disclosure, an apparatus for use in a wireless communication system includes a memory; and a processor, wherein the processor transmits scheduling information including resource allocation information, wherein the resource allocation information includes a resource indication value (RIV) determined based on a number of resource blocks (RBs) of a first bandwidth part (BWP), and transmits or receives data on a set of RBs corresponding to the RIV in a second BWP, wherein, if the number of RBs of the second BWP is greater than the number of RBs of the first BWP, a starting RB index S and a number of RBs L of the set of RBs corresponding to the RIV in the second BWP have one of the following values, respectively:

[0041] - starting RB index S: {0, K, 2*K,..., (N BWP1 -1)*K}, and

[0042] - number of RBs L: {K, 2*K, 3*K,..., N BWP1 *K}

[0043] where N BWP1 is the number of RBs of the first BWP, and K is a power of 2 and is determined based on (the number of RBs of the second BWP / the number of RBs of the first BWP).

[0044] In the third and fourth aspects, the first BWP and the second BWP include one of the following:

[0045] - (first BWP, second BWP) = (initial BWP, active BWP), and

[0046] - (first BWP, second BWP) = (currently activated BWP, newly activated BWP),

[0047] where the currently activated BWP is an active BWP at a point in time when the scheduling information is received, and the newly activated BWP is a BWP indicated by a bandwidth part indicator (BPI) in the scheduling information.

[0048] In the third and fourth aspects, K has the following values according to (the number of RBs of the second BWP / the number of RBs of the first BWP):

[0049] 1<X<2 2≤X<4 4≤X<8 8≤X<16 ... 2 n ≤X<2 n+1 ]]> K 1 2 4 8 ... 2 n ]]

[0050] where X is (the number of RBs of the second BWP / the number of RBs of the first BWP), and n is an integer of 0 or more. In the third and fourth aspects, the RIV has a value satisfying the following equation:

[0051] - if (L'-1) ≤ floor(N BWP1 / 2), RIV = N BWP1(L'-1) + S', and

[0052] - If (L'-1) > floor(N BWP1 / 2), RIV = N BWP1 *(N BWP1 -L'+1) + (N BWP1 -1-S'),

[0053] where L' has a value of 1 ≤ L' ≤ N BWP1 -S' and S' is S / K.

[0054] In the third and fourth aspects, when the number of RBs of the second BWP is equal to or smaller than the number of RBs of the first BWP, the start RB index S and the number L of RBs of the RB set corresponding to the RIV in the second BWP are given by one of the following values, respectively:

[0055] - Start RB index S: {0, 1, 2,..., N BWP2 -1}, and

[0056] - Number L of RBs: {1, 2, 3,..., N BWP2},

[0057] where N BWP2 is the number of RBs of the second BWP.

[0058] Beneficial effects

[0059] According to embodiments of the present application, it is possible to efficiently transmit and receive a signal in a wireless communication system, particularly a cellular wireless communication system.

[0060] Effects obtainable from the various embodiments of the present disclosure are not limited to what has been described above, and other effects which are not described above and will be apparent to those skilled in the art from the following description can be derived from the embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 An example of a radio frame structure used in a wireless communication system is illustrated.

[0062] Figure 2 An example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system is illustrated.

[0063] Figure 3 is a diagram for explaining a physical channel used in a 3GPP system and a typical signal transmission method using the same.

[0064] Figure 4 An SS / PBCH block used for initial cell access in a 3GPP NR system is illustrated.

[0065] Figure 5 A procedure for transmitting control information and a control channel in a 3GPP NR system is illustrated.

[0066] Figure 6 A control resource set (CORESET) in which a physical downlink control channel (PUCCH) can be transmitted in a 3GPP NR system is illustrated.

[0067] Figure 7 A method for configuring a PDCCH search space in a 3GPP NR system is illustrated.

[0068] Figure 8 is a conceptual diagram illustrating carrier aggregation.

[0069] Figure 9 is a diagram for explaining single carrier communication and multi-carrier communication.

[0070] Figure 10 is a diagram showing an example in which a cross-carrier scheduling technique is applied.

[0071] Figures 11-12 is a diagram illustrating bandwidth part (BWP) configuration.

[0072] Figure 13 Another resource allocation in an embodiment of the present invention is illustrated.

[0073] Figure 14 Resource allocation according to an RIV method is illustrated.

[0074] Figure 15 Resource allocation according to an embodiment of the present invention is illustrated.

[0075] Figure 16 Signal transmission according to an embodiment of the present invention is illustrated.

[0076] Figure 17 is a diagram illustrating BWP configuration.

[0077] Figures 18-19 Resource allocation according to an embodiment of the present invention is illustrated.

[0078] Figure 20 Signal transmission according to an embodiment of the present invention is illustrated.

[0079] Figure 21 is a block diagram showing a configuration of a UE and a base station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0080] The terms used in the specification are adopted as general terms currently widely used in consideration of functions in the present application, but can be changed according to the intention, customs, and appearance of new technology of those skilled in the art. In addition, in a specific case, there are terms arbitrarily selected by the applicant, and in this case, the meaning thereof will be described in the corresponding description part of the present application. Therefore, it is intended that the terms used in the specification should not be analyzed only based on the name of the term, but should be analyzed based on the substantial meaning of the term and the context in the entire specification.

[0081] Throughout the specification and the subsequent claims, when it is described that one element is "connected" to another element, the one element can be "directly connected" to the other element or "electrically connected" to the other element through a third element. In addition, unless explicitly described to the contrary, the word "comprise" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. Furthermore, in some example embodiments, a limitation such as "greater than or equal to" or "less than or equal to" based on a specific threshold value can be appropriately replaced with "greater than" or "less than", respectively.

[0082] The following techniques can be used in 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), etc. The CDMA can be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. The TDMA can be implemented by a radio technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). The OFDMA can be implemented by a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), etc. The UTRA is a part of a universal mobile telecommunication system (UMTS). A 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of an evolved UMTS (E-UMTS) using evolved UMTS terrestrial radio access (E-UTRA), and LTE-advanced (A) is an evolved version of the 3GPP LTE. The 3GPP new radio (NR) is a system designed separately from the LTE / LTE-A, and is a system for supporting enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine type communication (mMTC) services as requirements of IMT-2020. For clarity, the 3GPP NR is mainly described, but the technical idea of the present application is not limited thereto.

[0083] Unless specified otherwise in the present specification, a base station can refer to a next generation Node B (gNB) as defined in 3GPP NR. Also, unless specified otherwise, a terminal can refer to a user equipment (UE).

[0084] In the present specification, ceil A denotes a ceiling function, floor A denotes a floor function, and A mod B denotes a remainder of A divided by B.

[0085] Figure 1 FIG. illustrates an example of a radio frame structure used in a wireless communication system. Referring to Figure 1 , a radio frame (or a radio frame) used in a 3GPP NR system can have a length of 10 ms (Δf max N f / 100)*T c ). Also, the radio frame includes 10 subframes (SFs) equal in size. Here, Δf max = 480*10 3 Hz, N f = 4096, T c = 1 / (Δf ref *N f,ref ), Δf ref = 15*10 3 Hz, and N f,ref = 2048. Numbers from 0 to 9 can be respectively assigned to the 10 subframes within one radio frame. The length of each subframe is 1 ms and can include one or more slots according to a subcarrier spacing. More specifically, in the 3GPP NR system, a subcarrier spacing that can be used is 15*2 μ kHz, and μ can have values of μ = 0, 1, 2, 3, 4 as a subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for the subcarrier spacing. One subframe of 1 ms in length can include 2 μ slots. In this case, the length of each slot is 2 -μ ms. Numbers from 0 to 2 μ -1 can be respectively assigned to the 2 μ slots within one subframe. Also, numbers from 0 to 10*2 μ -1 can be respectively assigned to the slots within one radio frame. Time resources can be distinguished by at least one of a radio frame number (also referred to as a radio frame index), a subframe number (also referred to as a subframe index), and a slot number (or slot index).

[0086] Figure 2 FIG. illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular,Figure 2 The structure of a resource grid of a 3GPP NR system is shown. There is one resource grid per antenna port. Referring to Figure 2 , a slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. One OFDM symbol is also referred to as one symbol interval. Unless otherwise specified, an OFDM symbol can be simply referred to as a symbol. Referring to Figure 2 , a signal transmitted per slot can be represented by a resource grid including N size,μ grid,x *N RB sc subcarriers and N slot symb OFDM symbols. Here, x = DL when the signal is a DL signal, and x = UL when the signal is a UL signal. N size,μ grid,x represents the number of resource blocks (RBs) according to subcarrier spacing component μ (x is DL or UL), and N slot symb represents the number of OFDM symbols in a slot. N RB sc is the number of subcarriers constituting one RB and N RB sc = 12. The OFDM symbol can be referred to as a cyclic shift OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol according to a multiple access scheme.

[0087] The number of OFDM symbols included in one slot can vary according to the length of a cyclic prefix (CP). For example, one slot includes 14 OFDM symbols in the case of a normal CP, but one slot can include 12 OFDM symbols in the case of an extended CP. In a particular embodiment, the extended CP can be used only at a 60 kHz subcarrier spacing. In Figure 2 , one slot is configured with 14 OFDM symbols as an example for convenience of description, but embodiments of the disclosure can be applied to a slot having a different number of OFDM symbols in a similar manner. Referring to Figure 2 , each OFDM symbol includes N size,μ grid,x *N RB sc subcarriers in the frequency domain. The types of subcarriers can be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of a reference signal, and a guard band. The carrier frequency is also referred to as a center frequency (fc).

[0088] One RB can be represented by N RBsc (e.g., 12) consecutive subcarriers define. For reference, a resource configured with one OFDM symbol and one subcarrier can be referred to as a resource element (RE) or a tone. Thus, one RB can be configured with N slot symb *N RB sc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) in one slot. k can be an index assigned from 0 to N size,μ grid,x *N RB sc -1, and l can be an index assigned from 0 to N slot symb -1.

[0089] For a UE to receive a signal from a base station or transmit a signal to the base station, the time / frequency of the UE can be synchronized with that of the base station. This is because when the base station and the UE are synchronized, the UE can determine the time and frequency parameters necessary to demodulate a DL signal at the right time and transmit a UL signal.

[0090] Each symbol of a radio frame used in time division duplex (TDD) or unpaired spectrum can be configured with at least one of a DL symbol, a UL symbol, and a flexible symbol. A radio frame used as a DL carrier in frequency division duplex (FDD) or paired spectrum can be configured with a DL symbol or a flexible symbol, and a radio frame used as a UL carrier can be configured with a UL symbol or a flexible symbol. In a DL symbol, a DL transmission is possible, but a UL transmission is not possible. In a UL symbol, a UL transmission is possible, but a DL transmission is not possible. A flexible symbol can be determined to be used as a DL or a UL according to a signal.

[0091] Information on the type of each symbol, i.e., information indicating any one of a DL symbol, a UL symbol, and a flexible symbol, can be configured with a cell-specific or common radio resource control (RRC) signal. In addition, information on the type of each symbol can be additionally configured with a UE-specific or dedicated RRC signal. The base station informs i) a period of a cell-specific slot configuration, ii) a number of slots having only DL symbols from the beginning of the period of the cell-specific slot configuration, iii) a number of DL symbols from the first symbol of a slot immediately after the slot having only DL symbols, iv) a number of slots having only UL symbols from the end of the period of the cell-specific slot configuration, and v) a number of UL symbols from the last symbol of a slot immediately before the slot having only UL symbols, by using the cell-specific RRC signal. Here, a symbol not configured with any one of a UL symbol and a DL symbol is a flexible symbol.

[0092] When the information on the symbol type is configured with the UE-specific RRC signal, the base station can signal whether the flexible symbol is a DL symbol or a UL symbol with the cell-specific RRC signal. In this case, the UE-specific RRC signal cannot change the DL symbol or the UL symbol configured with the cell-specific RRC signal to another symbol type. The UE-specific RRC signal can signal the number of DL symbols among the N slot symb slot symb symbols of the corresponding slot and the number of UL symbols among the N symbols of the corresponding slot. In this case, the DL symbols of the slot can be consecutively configured with the first symbol to the i-th symbol of the slot. Also, the UL symbols of the slot can be consecutively configured with the j-th symbol to the last symbol of the slot (where i < j). In the slot, the symbol not configured with any one of the UL symbol and the DL symbol is the flexible symbol.

[0093] The type of the symbol configured with the above RRC signal can be referred to as a semi-static DL / UL configuration. In the semi-static DL / UL configuration previously configured with the RRC signal, the flexible symbol can be indicated as a DL symbol, a UL symbol indication, or a flexible symbol by dynamic slot format information (SFI) transmitted on a physical DL control channel (PDCCH). In this case, the DL symbol or the UL symbol configured with the RRC signal is not changed to another symbol type. Table 1 illustrates the dynamic SFI that the base station can indicate to the UE.

[0094] [Table 1]

[0095]

[0096] In Table 1, D denotes a DL symbol, U denotes a UL symbol, and X denotes a flexible symbol. As shown in Table 1, at most two DL / UL switches in one slot can be allowed.

[0097] Figure 3 is a diagram for explaining a physical channel used in a 3GPP system (for example, NR) and a typical signal transmission method using the physical channel. If the power of the UE is turned on or the UE camps on a new cell, the UE performs an initial cell search (S101). Specifically, the UE can be synchronized with the BS in the initial cell search. To this end, the UE can receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to be synchronized with the base station and obtain information such as a cell ID. Thereafter, the UE can receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0098] ​After the initial cell search is completed, the UE receives a physical downlink shared channel (PDSCH) according to a physical downlink control channel (PDCCH) and information in the PDCCH, so that the UE can obtain more specific system information than system information obtained through the initial cell search (S102).

[0099] When the UE initially accesses a base station or does not have a radio resource for signal transmission, the UE can perform a random access procedure on the base station (operations S103 to S106). First, the UE can transmit a preamble through a physical random access channel (PRACH) (S103) and receive a response message for the preamble from the base station through a PDCCH and a corresponding PDSCH (S104). When the UE receives a valid random access response message, the UE transmits data including an identifier of the UE, etc. to the base station through a physical uplink shared channel (PUSCH) indicated by a UL grant transmitted from the base station through a PDCCH (S105). Next, the UE waits for reception of a PDCCH as an indication of the base station for collision resolution. If the UE successfully receives the PDCCH through the identifier of the UE (S106), the random access procedure is terminated.

[0100] After the above-described procedure, the UE receives a PDCCH / PDSCH (S107) and transmits a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general UL / DL signal transmission procedure. In particular, the UE can receive downlink control information (DCI) through a PDCCH. The DCI can include control information such as resource allocation information for the UE. In addition, the format of the DCI can vary according to a predetermined use. Uplink control information (UCI) transmitted by the UE to the base station through a UL includes a DL / UL ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, the PMI, and the RI can be included in channel state information (CSI). In the 3GPP NR system, the UE can transmit control information such as the HARQ-ACK and the CSI described above through a PUSCH and / or a PUCCH.

[0101] Figure 4 An SS / PBCH block for initial cell access in a 3GPP NR system is illustrated. When a power is turned on or wants to access a new cell, the UE can obtain time and frequency synchronization with the cell and perform an initial cell search procedure. The UE can detect a physical cell identity N cell IDTo this end, the UE can receive a synchronization signal, e.g., a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station and synchronize with the base station. In this case, the UE is able to obtain information such as a cell identity (ID).

[0102] Referring to Figure 4 (a), the synchronization signal (SS) will be described in more detail. The synchronization signal can be classified into a PSS and an SSS. The PSS can be used to obtain time-domain synchronization and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS can be used to obtain frame synchronization and a cell group ID. Referring to Figure 4 (a) and Table 2, the SS / PBCH block can be configured with 20 contiguous RBs (= 240 subcarriers) on a frequency axis and can be configured with 4 contiguous OFDM symbols on a time axis. In this case, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol and the SSS is transmitted in the third OFDM symbol through the 56th to 182nd subcarriers. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit a signal through the remaining subcarriers, i.e., the 0th to 55th subcarriers and the 183rd to 239th subcarriers. Further, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit a signal through the 48th to 55th subcarriers and the 183rd to 191st subcarriers. The base station transmits a physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block other than the above signals.

[0103] [Table 2]

[0104]

[0105] The SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each including three unique identifiers, specifically, such that each physical layer cell ID will be only a part of one physical layer cell identifier group. Thus, a physical layer cell ID N cell ID = 3N (1) ID +N (2) ID can be indicated by an index N (1) ID indicating a range from 0 to 335 of the physical layer cell identifier groups and an index N (2) IDis uniquely defined. The UE can detect the PSS and identify one of three unique physical layer identifiers. In addition, the UE is able to detect the SSS and identify one of 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d PSS (n) is as follows.

[0106]

[0107] Here, x(i+7) = (x(i+4) + x(i)) mod 2 and is given as

[0108] [x(6) x(5) x(4) x(3) x(2) x(1) x(0)] = [1 1 0 1 1 0].

[0109] In addition, the sequence d SSS (n) is as follows.

[0110] d sss( n) = [1 -2x0((n+m0) mod 127) I1 -2x1((n+m1) mod 127)]

[0111]

[0112] Here, and is given as

[0113] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)] = [0 0 0 0 0 0 1]

[0114] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)] = [0 0 0 0 0 0 1].

[0115] A radio frame with a length of 10 ms can be divided into two half-frames with a length of 5 ms. With reference to Figure 4of (b), a slot in which the SS / PBCH block is transmitted in each half frame will be described. The slot in which the SS / PBCH block is transmitted can be any one of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz and the starting time point of the SS / PBCH block is the (2, 8 + 14*n)th symbol. In this case, n = 0 or 1 at a carrier frequency of 3 GHz or less. Also, n = 0, 1, 2, 3 can be at a carrier frequency higher than 3 GHz and lower than 6 GHz. In case B, the subcarrier spacing is 30 kHz and the starting time point of the SS / PBCH block is {4, 8, 16, 20} + 28*n. In this case, n = 0 at a carrier frequency of 3 GHz or less. Also, n = 0, 1 can be at a carrier frequency higher than 3 GHz and lower than 6 GHz. In case C, the subcarrier spacing is 30 kHz and the starting time point of the SS / PBCH block is the (2, 8 + 14*n)th symbol. In this case, n = 0 or 1 at a carrier frequency of 3 GHz or less. Also, n = 0, 1, 2, 3 can be at a carrier frequency higher than 3 GHz and lower than 6 GHz. In case D, the subcarrier spacing is 120 kHz and the starting time point of the SS / PBCH block is the (4, 8, 16, 20 + 28*n)th symbol. In this case, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 at a carrier frequency of 6 GHz or more. In case E, the subcarrier spacing is 240 kHz and the starting time point of the SS / PBCH block is the (8, 12, 16, 20, 32, 36, 40, 44 + 56*n)th symbol. In this case, n = 0, 1, 2, 3, 5, 6, 7, 8 at a carrier frequency of 6 GHz or more.

[0116] Figure 5 A procedure of transmitting control information and a control channel in a 3GPP NR system is illustrated. Referring to Figure 5of (a), the base station can add a cyclic redundancy check (CRC) masked (e.g., exclusive-OR operation) with a radio network temporary identifier (RNTI) to control information (e.g., downlink control information (DCI)) (S202). The base station can scramble the CRC with an RNTI value determined according to a purpose / target of each control information. A common RNTI used by one or more UEs can include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). Also, a UE-specific RNTI can include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. Thereafter, the base station can perform rate matching according to a resource amount for PDCCH transmission after performing channel coding (e.g., polar coding) (S204). Thereafter, the base station can multiplex the DCI based on a PDCCH structure based on a control channel element (CCE) (S208). Also, the base station can apply additional processes such as scrambling, modulation (e.g., QPSK), interleaving, etc. to the multiplexed DCI (S210), and then map the DCI to a resource to be transmitted. The CCE is a basic resource unit for the PDCCH, and one CCE can include a plurality of (e.g., six) resource element groups (REGs). One REG can be configured with a plurality of (e.g., 12) REs. The number of CCEs used for one PDCCH can be defined as an aggregation level. In the 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 can be used. Figure 5 of (b) is a diagram related to a CCE aggregation level and multiplexing of PDCCHs, and illustrates a type of a CCE aggregation level for one PDCCH and CCEs transmitted in a control region therefrom.

[0117] Figure 6 A control resource set (CORESET) in which a physical downlink control channel (PUCCH) can be transmitted in the 3GPP NR system is illustrated. The CORESET is a time-frequency resource in which a PDCCH (i.e., a control signal for a UE) is transmitted. Also, a search space to be described later can be mapped to one CORESET. Accordingly, the UE can monitor a time-frequency domain designated as a CORESET instead of monitoring all frequency bands for PDCCH reception, and decode a PDCCH mapped to the CORESET. The base station can configure one or more CORESETs to the UE per cell. The CORESET can be configured with up to three consecutive symbols on a time axis. Also, the CORESET can be configured in units of six consecutive PRBs on a frequency axis. In Figure 5In an embodiment of FIG. 1, CORESET #1 is configured with contiguous PRBs, while CORESET #2 and CORESET #3 are configured with non-contiguous PRBs. A CORESET can be located in any symbol in a slot. For example, in Figure 5 In an embodiment of FIG. 1, CORESET #1 starts at the first symbol of a slot, CORESET #2 starts at the fifth symbol of a slot, and CORESET #9 starts at the ninth symbol of a slot.

[0118] Figure 7 A method for setting a PUCCH search space in a 3GPP NR system is illustrated. In order to transmit a PDCCH to a UE, each CORESET can have at least one search space. In an embodiment of the disclosure, a search space is a set of all time-frequency resources (hereinafter, a PDCCH candidate) that can be used to transmit a PDCCH of a UE. A search space can include a common search space that requires a 3GPP NR UE to commonly search and a terminal-specific search space or a UE-specific search space that requires a specific UE to search. In the common search space, a UE can monitor a PDCCH set so that all UEs in a cell belonging to the same base station commonly search. In addition, a UE-specific search space can be set for each UE so that a UE monitors a PDCCH allocated to each UE at a search space location that is different according to the UE. In the case of a UE-specific search space, since a limited control region of a PDCCH can be allocated, search spaces between UEs can be partially overlapped and allocated. Monitoring a PDCCH includes blind decoding a PDCCH candidate in a search space. When blind decoding is successful, it can be expressed as (successfully) detecting / receiving a PDCCH, and when blind decoding fails, it can be expressed as not detecting / receiving or not successfully detecting / receiving a PDCCH.

[0119] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI previously known by one or more UEs in order to transmit DL control information to the one or more UEs is referred to as a group common (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled with a specific terminal's RNTI known by a specific UE in order to transmit UL scheduling information or DL scheduling information to the specific UE is referred to as a PDCCH of the specific UE. A common PDCCH can be included in a common search space, and a UE-specific PDCCH can be included in a common search space or a UE-specific PDCCH.

[0120] The base station can signal information about resource allocation related to a paging channel (PCH) and a downlink shared channel (DL-SCH) as a transport channel (i.e., a DL grant) or information about resource allocation related to an uplink shared channel (UL-SCH) and a hybrid automatic repeat request (HARQ) (i.e., a UL grant) to each UE or a group of UEs through a PDCCH. The base station can transmit a PCH transport block and a DL-SCH transport block through a PDSCH. The base station can transmit data excluding specific control information or specific service data through a PDSCH. In addition, the UE can receive data excluding specific control information or specific service data through a PDSCH.

[0121] The base station can include information about which UE(s) PDSCH data is transmitted to and how the PDSCH data is to be received and decoded by the corresponding UE(s) in the PDCCH and transmit the PDCCH. For example, it is assumed that DCI transmitted on a specific PDCCH is CRC-masked with RNTI "A" and the DCI indicates that a PDSCH is allocated to radio resources "B" (e.g., a frequency location) and indicates transport format information "C" (e.g., a transport block size, a modulation scheme, coding information, etc.). The UE monitors the PDCCH using RNTI information that the UE has. In this case, if there is a UE that performs blind decoding of the PDCCH using the "A" RNTI, the UE receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the information of the received PDCCH.

[0122] Table 3 shows an embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0123] [Table 3]

[0124] PUCCH format Length of OFDM symbol Number of bits 0 1-2 ≤2 1 4-14 ≤2 2 1-2 ＞2 3 4-14 ＞2 4 4-14 ＞2

[0125] The PUCCH can be used to transmit the following UL control information (UCI).

[0126] - Scheduling Request (SR): information for requesting UL UL-SCH resources.

[0127] - HARQ-ACK: a response to PDCCH (indicating DL SPS release) and / or a response to a DL transport block (TB) on PDSCH. The HARQ-ACK indicates whether information transmitted on the PDCCH or PDSCH is received. The HARQ-ACK response includes a positive ACK (hereinafter, ACK), a negative ACK (hereinafter, NACK), a discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. In general, ACK can be represented by a bit value of 1, and NACK can be represented by a bit value of 0.

[0128] - Channel state information (CSI): feedback information about a DL channel. The UE generates it based on a CSI-reference signal (RS) transmitted by the base station. Multiple-input multiple-output (MIMO)-related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). The CSI can be divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0129] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, various channel environments, and frame structures.

[0130] PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or an SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on a time axis and one RB on a frequency axis. When PUCCH format 0 is transmitted in two OFDM symbols, the same sequence on the two symbols can be transmitted through different RBs. Through this, the UE can obtain a frequency diversity gain. More specifically, the UE can determine a value m bit of a cyclic shift according to M bit bits of UCI (M cs = 1 or 2), and map a sequence obtained by cyclically shifting a base sequence of a length of 12 to a predetermined value m cs to 12 REs of one OFDM symbol and one PRB and transmit the sequence. If the number of cyclic shifts available to the UE is 12 and M bit = 1, 1-bit UCI 0 and 1 can be represented by sequences corresponding to two cyclic shifts having a difference of 6 in the cyclic shift value. In addition, when M bit = 2, 2-bit UCI 00, 01, 11, and 10 can be represented by sequences corresponding to four cyclic shifts having a difference of 3 in the cyclic shift value.

[0131] PUCCH format 1 can deliver 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 can be transmitted through consecutive OFDM symbols on a time axis and one PRB on a frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 can be one of 4 to 14. More specifically, a UE can perform BPSK modulation on M bit = 1 UCI. The UE can perform modulation on M bit = 2 UCI with quadrature phase shift keying (QPSK). The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a length-12 sequence. In this case, the sequence can be a base sequence used for PUCCH format 0. The UE transmits the obtained signal by time-axis orthogonal cover code (OCC) spreading of even-numbered OFDM symbols to which PUCCH format 1 is assigned. PUCCH format 1 determines the maximum number of different UEs multiplexed in one RB according to the length of OCC to be used. A demodulation reference signal (DMRS) can be spread with the OCC and mapped to odd-numbered OFDM symbols of PUCCH format 1.

[0132] PUCCH format 2 can deliver more than 2-bit UCI. PUCCH format 2 can be transmitted through one or two OFDM symbols on a time axis and one or more RBs on a frequency axis. When PUCCH format 2 is transmitted in two OFDM symbols, sequences transmitted in different RBs through the two OFDM symbols can be identical to each other. Here, the sequence can be a plurality of modulated complex-valued symbols d(0),...,d(M symbol - 1). Here, M symbol may be M bit / 2. Through this, a UE can obtain frequency diversity gain. More specifically, M bit -bit UCI (M bit > 2) is bit-level scrambled, QPSK-modulated, and mapped to the RB of one or two OFDM symbols. Here, the number of RBs can be one of 1 to 16.

[0133] PUCCH format 3 or PUCCH format 4 can deliver more than 2-bit UCI. PUCCH format 3 or PUCCH format 4 can be transmitted through consecutive OFDM symbols on a time axis and one PRB on a frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 can be one of 4 to 14. Specifically, a UE modulates M bit -bit UCI (M bit > 2) with e / 2-binary phase shift keying (BPSK) or QPSK to generate complex-valued symbols d(0) to d(M symb-1). Here, when π / 2-BPSK is used, M symb = M bit , and when QPSK is used, M symb = M bit / 2. The UE can not apply block-wise spreading for PUCCH format 3. However, the UE can apply block-wise spreading for one RB (i.e., 12 subcarriers) using PreDFT-OCC of length 12, so that PUCCH format 4 can have two or four multiplexing capability. The UE performs transmit precoding (or DFT precoding) on the spread signal and maps it to each RE to transmit the spread signal.

[0134] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 can be determined according to the length of UCI transmitted by the UE and the maximum coding rate. When the UE uses PUCCH format 2, the UE can transmit HARQ-ACK information and CSI information together through the PUCCH. When the number of RBs that the UE can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the UE can transmit only the remaining UCI information according to the priority of the UCI information without transmitting some of the UCI information.

[0135] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured through an RRC signal to indicate frequency hopping in a slot. When frequency hopping is configured, the index of the RB to be frequency-hopped can be configured with an RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted through N OFDM symbols in the time axis, the first hop can have floor(N / 2) OFDM symbols and the second hop can have ceiling(N / 2) OFDM symbols.

[0136] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted can be configured through an RRC signal. The repeatedly transmitted PUCCH must start from the OFDM symbol at a constant position in each slot and have a constant length. When one of the OFDM symbols among the OFDM symbols of the slot in which the UE should transmit the PUCCH is indicated as a DL symbol through an RRC signal, the UE can not transmit the PUCCH in the corresponding slot and delay the transmission of the PUCCH to the next slot to transmit the PUCCH.

[0137] Figure 8is a conceptual diagram illustrating carrier aggregation. Carrier aggregation is a method in which a UE uses multiple frequency blocks or (in a logical sense) cells configured with UL resources (or component carriers) and / or DL resources (or component carriers) as one large logical frequency band in order for a wireless communication system to use a wider frequency band. One component carrier can also be referred to as a term called a primary cell (PCell) or a secondary cell (SCell) or a primary SCell (PScell). However, hereinafter, for convenience of description, the term "component carrier" is used.

[0138] Reference Figure 8 , as an example of a 3GPP NR system, the entire system frequency band can include up to 16 component carriers, and each component carrier can have a bandwidth of up to 400 MHz. A component carrier can include one or more physically contiguous subcarriers. Although it is shown in Figure 8 that each component carrier has the same bandwidth, this is merely an example, and each component carrier can have a different bandwidth. In addition, although each component carrier is shown as being adjacent to each other in the frequency axis, the drawing is shown in a logical concept, and each component carrier can be physically adjacent to each other, or can be spaced apart.

[0139] A different center frequency can be used for each component carrier. In addition, one common center frequency can be used in physically adjacent component carriers. Assuming that all component carriers are physically adjacent in the embodiment of Figure 8 , center frequency A can be used in all component carriers. In addition, assuming that respective component carriers are not physically adjacent to each other, center frequency A and center frequency B can be used in each component carrier.

[0140] When expanding the total system frequency band by carrier aggregation, a frequency band for communication with each UE can be defined in units of component carriers. UE A can use 100 MHz as the total system frequency band and perform communication using all five component carriers. UEs B1 to B5 can use only a 20 MHz bandwidth and perform communication using one component carrier. UEs C1 and C2 can use 40 MHz bandwidths and perform communication using two component carriers, respectively. The two component carriers can be logically / physically adjacent or not adjacent. UE C1 represents a case of using two non-adjacent component carriers, and UE C2 represents a case of using two adjacent component carriers.

[0141] Figure 9 is a diagram for explaining single carrier communication and multi-carrier communication. In particular, Figure 9 (a) of FIG. 1 shows a single carrier subframe structure and Figure 9 (b) of FIG. 1 shows a multi-carrier subframe structure.

[0142] Referring to Figure 9 (a), in the FDD mode, a general wireless communication system can perform data transmission or reception through one DL band and one UL band corresponding thereto. In another specific embodiment, in the TDD mode, the wireless communication system can divide a radio frame into UL time units and DL time units in the time domain and perform data transmission or reception through the UL / DL time units. Referring to Figure 9 (b), three 20MHz component carriers (CCs) can be aggregated into each of the UL and the DL, so that a bandwidth of 60MHz can be supported. Each CC can be adjacent or non-adjacent to each other in the frequency domain. Figure 9 (b) of FIG. 1 shows a case where the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetric, but the bandwidth of each CC can be independently determined. Further, asymmetric carrier aggregation having different numbers of UL CCs and DL CCs is possible. A DL / UL CC allocated / configured to a specific UE through RRC can be referred to as a serving DL / UL CC of the specific UE.

[0143] The base station can perform communication with the UE by activating some or all of the serving CCs of the UE or deactivating some of the CCs. The base station can change the CCs to be activated / deactivated and the number of the CCs to be activated / deactivated. If the base station allocates the CCs available for the UE as cell-specific or UE-specific, at least one of the allocated CCs is not deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. One CC not deactivated by the UE is referred to as a primary CC (PCC) or a primary cell (PCell), and the CCs that the base station can freely activate / deactivate are referred to as a secondary CC (SCC) or a secondary cell (SCell).

[0144] Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of DL resources and UL resources, i.e., a combination of DL CCs and UL CCs. A cell can be configured with DL resources alone, or can be configured with a combination of DL resources and UL resources. When carrier aggregation is supported, the linkage between the carrier frequency of the DL resources (or DL CCs) and the carrier frequency of the UL resources (or UL CCs) can be indicated by system information. The carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is referred to as a PCell, and a cell corresponding to a SCC is referred to as an SCell. The carrier corresponding to the PCell in the DL is a DL PCC, and the carrier corresponding to the PCell in the UL is a UL PCC. Similarly, the carrier corresponding to the SCell in the DL is a DL SCC, and the carrier corresponding to the SCell in the UL is a UL SCC. According to the UE capability, a serving cell can be configured with one PCell and zero or more SCells. In the case of a UE in an RRC_CONNECTED state but not configured for carrier aggregation or not supporting carrier aggregation, only one serving cell is configured with a PCell alone.

[0145] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" referring to a certain geographical area served by one base station or one antenna group. That is, one component carrier can also be referred to as a scheduling cell, a scheduled cell, a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, in order to distinguish between a cell indicating a certain geographical area and a cell of carrier aggregation, in the present disclosure, the cell of carrier aggregation is referred to as a CC, and the cell of a geographical area is referred to as a cell.

[0146] Figure 10 is a diagram illustrating an example in which a cross-carrier scheduling technique is applied. When cross-carrier scheduling is set, a control channel transmitted through a first CC can schedule a data channel transmitted through the first CC or a second CC using a carrier indicator field (CIF). The CIF is included in DCI. In other words, a scheduling cell is set, and a DL grant / UL grant transmitted in the PDCCH region of the scheduling cell schedules a PDSCH / PUSCH of a scheduled cell. That is, there is a search region for a plurality of component carriers in the PDCCH region of the scheduling cell. The PCell can basically be the scheduling cell, and a specific SCell can be designated as the scheduling cell by an upper layer.

[0147] In Figure 10In an embodiment of the disclosure, it is assumed that three DL CCs are combined. Here, it is assumed that the DL component carrier #0 is a DL PCC (or PCell), and the DL component carrier #1 and the DL component carrier #2 are DL SCCs (or SCells). Further, it is assumed that the DL PCC is set as a PDCCH monitoring CC. When cross-carrier scheduling is not configured through UE-specific (or UE group-specific or cell-specific) higher layer signaling, CIF is disabled, and each DL CC is able to transmit only a PDCCH for scheduling its PDSCH without CIF according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). Meanwhile, if cross-carrier scheduling is configured through UE-specific (or UE group-specific or cell-specific) higher layer signaling, CIF is enabled, and a specific CC (e.g., a DL PCC) can use CIF to transmit not only a PDCCH for scheduling a PDSCH of a DL CC A but also a PDCCH for scheduling a PDSCH of another CC (cross-carrier scheduling). On the other hand, no PDCCH is transmitted in another DL CC. Accordingly, the UE monitors a PDCCH not including CIF to receive a self-carrier scheduled PDSCH according to whether cross-carrier scheduling is configured for the UE, or monitors a PDCCH including CIF to receive a cross-carrier scheduled PDSCH.

[0148] On the other hand, Figure 9 and Figure 10 FIG. 3 illustrates a subframe structure of a 3GPP LTE-A system, and the same or similar configuration can be applied to a 3GPP NR system. However, in the 3GPP NR system, Figure 9 and Figure 10 A subframe of the 3GPP LTE-A system can be replaced with a slot.

[0149] Referring to Figure 11 In the 3GPP NR system, a UE can perform transmission / reception using a bandwidth equal to or smaller than a bandwidth of a carrier (or cell). To this end, the UE can be configured with one or more bandwidth parts (BWPs) from a base station. A BWP is constituted by contiguous PRBs. Referring to Figure 11 (a), a BWP can be configured not to overlap within a bandwidth of a carrier (or cell). Referring to Figure 11 (b), a BWP in a carrier (or cell) can be configured to overlap. Further, one BWP can be configured to be included in another BWP. One or more BWPs among the BWPs configured in a carrier (or cell) can be allocated and configured for each UE. In a carrier (or cell), only one BWP is active (an active BWP), and the UE does not expect to receive or transmit any signal in PRBs other than the active BWP in the carrier (or cell). The UE can transmit and receive with the base station using one active BWP among the allocated and configured BWPs.

[0150] In a TDD cell, up to 4 DL BWPs and up to 4 UL BWPs can be configured per cell. In an FDD cell, up to four DL / UL BWP pairs can be configured per cell. A UE can activate one DL BWP and one UL BWP per carrier (or cell). A DCI can be used to instruct the UE to move from one BWP to another, i.e., to deactivate the current BWP and activate a new BWP (hereinafter, BWP switching). Specifically, to change the DL BWP of the UE, a Bandwidth Part Indicator (BPI) indicating the newly activated BWP can be included in the DCI scheduling the PDSCH. That is, upon receiving the DCI scheduling the PDSCH, the UE can know through the BPI which BWP the PDSCH is transmitted through, and through the Resource Allocation (RA) information of the DCI, which PRBs in the BWP indicated by the BPI the PDSCH is transmitted from. Similarly, to change the UL BWP of the UE, a BPI indicating the newly activated BWP can be included in the DCI scheduling the PUSCH. That is, upon receiving the DCI scheduling the PUSCH, the UE can know through the BPI which BWP the PUSCH should be transmitted through, and through the RA information of the DCI, which PRBs in the BWP indicated by the BPI the PUSCH should be transmitted from. In the case of a TDD cell, the BPI indicates a DL BWP or an UL BWP, while in the case of an FDD cell, the BPI indicates a DL BWP / UL BWP pair.

[0151] Reference Figure 12 When multiple BWPs are configured in the UE, at least one CORESET can be configured / allocated to the UE in each BWP. Reference Figure 12 (a) and Figure 12 (b), the CORESETs for each BWP can be located in the time / frequency resource domain occupied by each BWP. In other words, CORESET#1 for BWP#1 exists in the PRBs in the time / frequency resource domain occupied by BWP#1, while CORESET#2 for BWP#2 can exist in the PRBs in the time / frequency resource domain occupied by BWP#2. Reference Figure 12 (b), when the BWPs are configured to overlap each other, the PRBs occupied by the CORESETs are within their own BWP time / frequency resource domain, but can be located in other BWPs. In other words, CORESET#2 for BWP#2 can overlap with the PRBs of the time / frequency resource domain occupied by BWP#1.

[0152] As described above, a plurality of BWPs can be configured in a carrier (or cell), and each BWP can consist of a plurality of consecutive PRBs. On the other hand, only one BWP (active BWP) is activated in a carrier (or cell), and the UE does not expect to receive or transmit any signal in the PRBs other than the active BWP in the carrier (or cell). The active BWP can be changed (BWP switching or change) using the BPI in the DCI. The BWP indicated by the BPI is newly activated, and the other configured BWPs are deactivated. The BPI can be included in the DCI scheduling the PDSCH or PUSCH.

[0153] When a plurality of BWPs are configured in a carrier (or cell), the frequency band / size (e.g., the number of PRBs) of each BWP can be independently configured. Accordingly, the number of PRBs can be different for each BWP. Meanwhile, the size of the DCI transmitted from the activated BWP can be determined based on the size of the BWP. Specifically, the RA field size of the DCI transmitted from the activated BWP can be determined based on the size of the active BWP or initial BWP. Accordingly, when the DCI schedules a BWP having a different size from the BWP used for the DCI size determination, the problem of the length / size (e.g., the number of bits) of the RA field being different should be addressed.

[0154] Hereinafter, a method for allocating resources when BWPs are configured in a carrier (or cell) and a method for transmitting and receiving data accordingly are described.

[0155] For the convenience of explanation, first, the terms are defined as follows.

[0156] - Active BWP: indicates an activated BWP. One BWP can be activated per cell. It indicates a BWP in which signals are transmitted and received. For example, the DL active BWP denotes a BWP on which PDCCH / PDSCH reception is performed. The UL active BWP denotes a BWP on which PUCCH / PUSCH transmission is performed. Depending on the duplex method, the DL active BWP and the UL active BWP can be the same or different.

[0157] - Inactive BWP: indicates a deactivated BWP. It denotes the remaining BWPs other than one active BWP in one cell, and is a BWP in which signal transmission and reception are not performed.

[0158] - BWP switching: BWP switching is a process of changing an active BWP from a currently activated BWP to a newly activated BWP. For example, when (i) an active BWP at a time point of receiving a PDCCH (or DCI) and (ii) a BWP indicated by a BPI of the PDCCH (or DCI) are different, the UE can change the active BWP from the currently active BWP to the BWP indicated by the BPI. That is, after switching the BWP, the active BWP becomes the BWP indicated by the BPI of the PDCCH (or DCI).

[0159] - current (active) BWP: it is an active BWP at a current time point of receiving a PDCCH (or DCI) including scheduling information. The currently activated BWP can have different UL BWP and DL BWP. When BWP switching is performed, it can be referred to as a previous (active) BWP compared to a new (active) BWP to be newly activated.

[0160] - new (active) BWP: at a current time point of receiving a PDCCH (or DCI) including scheduling information, it is an inactive BWP but indicates a BWP to be activated by BWP switching. That is, it shows an active BWP after BWP switching.

[0161] - initial (active) BWP: during or after RRC connection setup (connection setup), it indicates a BWP for an initial connection of the UE before the BWP is configured to the UE.

[0162] - default BWP: if not scheduled for a period of time or more, the UE switches an active DL BWP (or DL / UL BWP pair) to a default BWP.

[0163] - RA field of BWP: indicates an RA field used for scheduling a BWP.

[0164] - required RA field length of BWP: indicates a length / size (e.g., number of bits) of an RA field used for scheduling a BWP. The RA field size is determined based on a frequency band of the BWP (e.g., number of RBs).

[0165] - scheduling a BWP: refers to scheduling data transmission and reception in a BWP. For example, it can refer to scheduling PDSCH reception or scheduling PUSCH transmission in a BWP.

[0166] - Scheduling BWP#B from BWP#A: It can perform reception of scheduling information (e.g., DCI) in BWP#A, and can perform corresponding data transmission and reception in BWP#B. In addition, it can mean that the length / size of the scheduling information (e.g., DCI) is determined based on the size (e.g., the number of RBs) of BWP#A, and corresponding data transmission and reception is performed in BWP#B.

[0167] Embodiment 1: bitmap-based scheduling

[0168] The UE can determine a resource block group (RBG) size P according to the number of PRBs included in the BWP. The RBG is a basic unit of a bitmap-based resource allocation method (e.g., RA Type 0), and one RBG consists of P consecutive PRBs. Referring to Table 4, one of two configurations for the RBG size P can be RRCed, and the UE can have a larger RBG size (P) value as the number of PRBs of the BWP is larger. In a BWP having N PRBs, the RA field for bitmap-based resource allocation needs ceil(N / P) bits. For example, if the BWP consists of 40 PRBs and Configuration 1 is configured, the RBG size P = 4. That is, four (consecutive) PRBs are grouped to form one RBG, and ten RBGs are used for resource allocation. At this time, the RA field needs 10 bits.

[0169] [Table 4]

[0170]

[0171] Different BWPs can be configured to have different numbers of PRBs. Accordingly, the RBG size and the number of RBGs can be different for each BWP. Therefore, in order to schedule another BWP from one BWP, the problem of different lengths / sizes (e.g., the number of bits) of the RA field should be solved.

[0172] As a method of solving the above problem, if there are a plurality of BWPs configured in the UE, the UE can determine a plurality of DCI lengths based on the length of the RA field required for each BWP. Accordingly, the UE can perform PDCCH blind decoding by assuming a plurality of DCI lengths. Although this method solves the above problem, since PDCCH blind decoding is performed by assuming a plurality of DCI lengths, the energy consumption of the UE is serious.

[0173] Alternatively, the UE can determine the DCI length based on the longest RA field length required per BWP to which it is configured. Thus, the UE performs blind decoding using the DCI length reflecting the length of the RA field calculated based on the largest BWP. This method solves the above problem and does not increase the number of PDCCH blind decodings of the UE, but since the DCI length becomes longer, the coding gain of the PDCCH decreases, or causes high overhead in the control channel.

[0174] In another method, the UE can perform PDCCH blind decoding using the DCI length reflecting the length of the RA field calculated based on the largest BWP only when a higher layer (e.g., RRC) parameter (e.g., BandwidthPart-Config) informing of the BWP configuration is configured and BWP of different sizes is configured according to the corresponding configuration information. When BandwidthPart-Config is not configured, the UE can perform PDCCH blind decoding based on the DCI length corresponding to the default BWP.

[0175] As another method, the UE can determine the DCI length according to the RA field length required for the activated BWP, and perform PDCCH blind decoding using the determined DCI length. That is, the UE can interpret the RA differently according to the BPI value of the DCI. For example, when the BPI indicates the currently activated BWP, the RA can be interpreted according to the RBG size of the currently activated BWP. On the other hand, if the BPI indicates a BWP other than the currently activated BWP (hereinafter, a BWP to be newly activated), the RA can be interpreted according to the RBG size of the newly activated BWP. In this case, the length of the RA field included in the DCI is referred to as K current , and the length of the RA field required for the newly activated BWP is referred to as K new . As described above, the length of the required RA field can be determined by ceil (the number of PRBs in the BWP / RBG size). Here, if K current is greater than or equal to K new , K current bits of the RA field of the DCI (hereinafter, DCI RA field) indicate whether the i-th RBG of the BWP to be newly activated is allocated. Also, the last K current -K new bits of the RA field of the DCI are reserved as 0 or 1. If K current is less than K new , K new RBGs among the K new RBGs of the newly activated BWP are allocated according to the DCI RA field. If K currentRBG is always not allocated regardless of the RA field value, and the RA field can indicate information about whether the K current th RBG of the to-be-activated BWP is allocated. The i-th bit of the DCI RA field indicates whether the f(i)-th RBG of the to-be-activated BWP is allocated. Here, f(i) is a function corresponding to {1, 2,..., K current}->{1,2,...,K new}. For example, the configuration of f(i) can be as follows.

[0176] - It can be configured as f(i) = i. Thus, the i-th bit of the RA field of the DCI indicates whether the i-th RBG of the to-be-activated BWP is allocated. Here, the UE receives only resource allocation information about 1 to K current RBGs, and cannot receive resource allocation information about K current +1 to K new RBGs.

[0177] - It can be configured as f(i) = i + offset. The offset value can have one of 0, 1,..., (K new –K current ). Referring to Figure 13 , when BWP #1 has 5 RBGs and BWP #2 has 8 RBGs, the result of resource allocation when BWP #1 indicates BWP #1 scheduling information and the result of resource allocation when BWP #1 indicates BWP #2 scheduling information are as follows. Let the value of the RA field be [10 0 1 1]. Referring to Figure 13 (a), when BWP #1 indicates BWP #1 scheduling information, RBG #1, RBG #4, and RBG #5 of BWP #1 can be allocated. Referring to Figure 13 (b), if BWP #1 indicates BWP #2 scheduling information and the offset is 0, RBG #1, RBG #4, and RBG #5 of BWP #2 can be allocated. Referring to Figure 13 (c), if BWP #1 indicates BWP #2 scheduling information and the offset is 2, RBG #3, RBG #6, and RBG #7 of BWP #2 can be allocated.

[0178] - f(i) can be determined according to the C-RNTI of the UE or a value derived from the C-RNTI. For example, f(i) = i + (C-RNTImod(K new -K current +1)). Thus, the i-th bit of the DCI RA field indicates whether the i + (C-RNTImod(K new -K current+ 1)) RBGs. As another example, a pseudo-random sequence using C-RNTI can be used. For example, f(i) = i + (g(C-RNTI) mod (K new -K current + 1)). Here, g(C-RNTI) is a pseudo-random sequence created using C-RNTI. Since f(i) is determined based on C-RNTI, the resource allocation due to f(i) is different for each UE. However, in this method, the resource allocation due to f(i) is the same regardless of the BWP switching time point.

[0179] f(i) can be determined according to C-RNTI of the UE and a slot index or a value derived from the value. For example, f(i) = i + (n_slot + C-RNTI mod (K new -K current + 1)). Here, n_slot is an index of a slot in which the PDCCH is received or an index of a slot in which the PDSCH is allocated. Thus, the i-th bit of the DCI RA field indicates whether the i + (n_slot + C-RNTI mod (K new -K current + 1)) RBGs of the BWP to be newly activated. As another example, a pseudo-random sequence using C-RNTI and a slot index can be used. For example, f(i) = i + (g(C-RNTI, n_slot) mod (K new -K current + 1)). Here, g(C-RNTI, n_slot) is a pseudo-random sequence created using C-RNTI and n_slot. Since f(i) is determined not only by the C-RNTI value but also by the BWP switching time point, the resource allocation due to f(i) is different for each UE and for each BWP switching time point.

[0180] As another method, when K new is greater than K current , the RBG set RBG_set is grouped by combining RBGs of the BWP to be newly activated such that K current bits of the DCI received from the currently activated BWP (hereinafter, DCI RA field) can indicate whether the RBG set is scheduled. For example, the RGBs are grouped by S to make the RBG set K new,RBG_set = ceil(K newFor example, the RBG set #1 can be composed of RBG #1 to RBG #S, and the RBG set #2 can be composed of RBG #(S+1) to RBG #(2*S). The remaining RBGs except for the last RBG set include S RBGs, and the last RBG set can include ((K new -1) mod S) + 1 RBGs. In this case, the i-th bit of the DCI RA field indicates whether the f(i)-th RBG_set of the BWP to be newly activated is allocated. Here, f(i) is a function corresponding to {1, 2,..., K current}->{1, 2,..., K new,RBG_set}. For example, the configuration of f(i) can be as follows.

[0181] - f(i) can be configured as f(i) = i. Thus, the i-th bit of the DCI RA field indicates whether the f(i)-th RBG_set of the BWP to be newly activated is allocated. Here, the UE receives resource allocation information for 1 to K current RBG sets only, and cannot allocate resource allocation information for K current +1 to K new,RBG_set RBG sets.

[0182] - It can be configured as f(i) = i + offset. The offset value can have one of 0, 1,..., (K new,RBG_set -K current ).

[0183] - f(i) can be determined according to the C-RNTI of the UE or a value derived from the C-RNTI. For example, f(i) = i + (C-RNTI mod (K new,RBG_set -K current +1)). Thus, the i-th bit of the DCI RA field indicates whether the i + (C-RNTI mod (K new,RBG_set -K current +1))-th RGB set of the BWP to be newly activated is allocated. As another example, a pseudo-random sequence using the C-RNTI can be used. For example, f(i) = i + (g(C-RNTI) mod (K new,RBG_set -K current +1)). Here, g(C-RNTI) is a pseudo-random sequence created using the C-RNTI. Since f(i) is determined based on the C-RNTI, the resource allocation due to f(i) is different for each UE. However, in this method, the resource allocation due to f(i) is the same regardless of the BWP switching time point.

[0184] - f(i) can be determined according to the C-RNTI of the UE and the slot index or a value derived from the value. For example, f(i) = i + (n_slot + C-RNTI mod (K new,RBG_set - K current + 1)). Here, n_slot is the index of the slot in which the PDCCH is received or the index of the slot in which the PDSCH is allocated. Thus, the i-th bit of the DCI RA field indicates whether the i + (n_slot + C-RNTI mod (K new,RBG_set - K current + 1))-th RBG set of the BWP to be newly activated is allocated. As another example, a pseudo-random sequence using the C-RNTI and the slot index can be used. For example, f(i) = i + (g(C-RNTI, n_slot) mod (K new,RBG_set - K current + 1)). Here, g(C-RNTI, n_slot) is a pseudo-random sequence created using the C-RNTI and n_slot. Since f(i) is determined not only by the C-RNTI value but also by the BWP switching time point, the resource allocation due to f(i) is different for each UE and for each BWP switching time point.

[0185] The above-described method is related to an event that can occur when BWP switching is performed between BWPs having different PRB numbers. After the BWP switching occurs, the UE can perform PDCCH decoding by calculating the DCI length based on the RA field length of the newly activated BWP. In addition, when operating in a fallback mode, the UE can perform PDCCH decoding in the case of DL by calculating the DCI length based on the RA field length of the BWP considered as a default DL BWP. In addition, in the case of UL, the UE can perform PDCCH decoding by calculating the DCI length based on the RA field length of the BWP considered as a default UL BWP.

[0186] As another example of the present application, if the size of the RA field of the newly activated BWP indicated by the BPI is greater than the size of the RA field of the currently activated BWP, the UE can append '0' to fit the size of the larger RA field. Specifically, when the RA field size of the currently active BWP is referred to as K current and the RA field size of the newly activated BWP is referred to as K RBG,set (or K new ), after decoding the DCI, the UE can append K RBG_set - K current 0s to the K current -length RA field and then interpret the DCI field value (e.g., Knew the length of the RA field. Here, regarding the addition of K RBG_set current The position to which K RBG_set K current 0s are added can consider the following methods.

[0187] For example, the UE can add K current K current 0s to the front (most significant bit (MSB), front) of the K current length RA field. By using the value of the K RBG_set length RA field as it is, the resource allocation range that the value of the K current length RA field can have, resource allocation can be performed in a newly activated BWP in which the resource allocation range that the currently activated BWP can have, or can be differently reinterpreted according to the above-described methods. For example, when the resource allocation granularity is increased to perform resource allocation or has the same resource allocation as the currently active BWP, resource allocation can be configured to be shifted in the newly activated BWP by configuring an offset value for each UE.

[0188] As another example, the UE can add K current K current 0s to the rear (least significant bit (LSB), rear) of the K current length RA field. By subtracting a certain value from the resource allocation range that the value of the K RBG_set length RA field can have, flexibility can be provided as much as possible without scheduling limitations when allocating resources in a newly activated BWP. For example, when the resource allocation range that the value of the K current length RA field can have is {0, 1, 2,..., 9} and the size of the newly activated BWP is doubled, by adding '0' to the LSB of the RA field, the resource allocation range in the newly activated BWP can be {0, 2, 4, 6, 8, 10,..., 18}. By doing so, in the case where BWP switching is performed, flexibility can be provided as much as possible without scheduling limitations when allocating resources in a BWP to be newly activated.

[0189] As another example, the UE can add P of K current K current 0s to the front (most significant bit (MSB), front) of the K RBG_set length RA field and add Q of K current 0s to the rear (least significant bit (LSB), rear) of the K RBG_set ​-K current P (or Q) is obtained from the remainder of +1). Here, R can be obtained from the UE's C-RNTI. For example, P = C-RNTI mod(K) RBG_set -K current +1), Q=K RBG_set -K current -P. Furthermore, R can be obtained from the UE's C-RNTI and slot index. For example, P = (C-RNTI + ns) mod (K) RBG_set -K current +1), Q=K RBG_set -K current -P. Here, ns represents the time slot index. Additional random numbers can be included in the equation used to obtain P.

[0190] Embodiment 2: resource indication value (RIV)-based scheduling

[0191] The RIV method is used in LTE as a method for indicating the continuous allocation of resources. In LTE DL Type 2 resource allocation, the RIV method is used to allocate consecutive RBs. More specifically, PDCCH DCI formats 1A, 1B, 1D, EPDCCH DCI formats 1A, 1B, 1D, and MPDCCH DCI formats 6-1A have RIV values, and the starting RB index can be determined through the RIV value. start and the number L of continuously allocated RBs CRBs Here, RB can refer to either a Virtual Resource Block (VRB) or a Physical Resource Block (PRB). In existing LTE systems, the RIV value is determined as follows.

[0192] [Equation 1]

[0193] Jiaguo but

[0194]

[0195] otherwise

[0196]

[0197] Where L CRBs ≥1 and should not exceed

[0198] Here, N DL RB This is the number of RBs in the DL bandwidth (BW). When the RIV-based resource allocation method is used for the uplink, N DL RB The number N of RBs can be used in UL BW UL RBReplace them. When BWP is configured, DL BW and UL BW can be replaced with DLBWP and UL BWP respectively.

[0199] Here, RIV has 0, 1, ..., N. DL RB *(N DL RB The value of +1) / 2-1. Therefore, the number of bits required to represent RIV in existing LTE is defined as ceil(log2(N) / 2-1. DL RB *(N DL RB +1) / 2)).

[0200] Figure 14 The diagram illustrates resource allocation based on the RIV method. (Reference) Figure 14 When the number of RBs is 5, N RB *(N RB +1) / 2 = 15. Therefore, RIV has values ​​of 0, 1, ..., 14, and the number of bits required to represent RIV is four. When RB start =0 and L CRBs When RIV = 3, RIV has 10 according to Equation 1. After receiving RIV = 10, the UE can determine the RB that satisfies RIV = 10 based on the relationship in Equation 1. start and L CRBs Therefore, the UE is able to know the relationship with the RB. start =0 and L CRBs =3 corresponds to {RB#0 to 2} which are allocated for data (e.g., PDSCH or PUSCH) transmission / reception. Similarly, if RB start =2 and L CRBs =2, then RIV has 7. After receiving RIV=7, the UE can know the relationship with RB. start =2 and L CRBs =2 corresponds to {RB#2 to 3} which are allocated for data transmission / reception.

[0201] As mentioned above, different BWPs can be configured with different numbers of PRBs. In the RIV method, since the number of bits required for the RA field depends on the bandwidth of the BWP (e.g., the number of RBs), the issue of different RA field lengths must be addressed in order to schedule one BWP from another.

[0202] Hereinafter, in order to solve the above-described problem, when the length (e.g., the number of bits) of the frequency domain RA field included in the DCI is different from the length required for the frequency resource field allocation information indicating the active DL BWP (or the active UL BWP), a method for obtaining the frequency resource field allocation information of the active DL BWP (or the active UL BWP) is proposed. Here, the value of the frequency domain RA field can indicate the frequency resource (e.g., the RB set) allocated for data (PDSCH or PUSCH) transmission in the BWP. When the RIV-based scheduling is used and the length (e.g., the number of bits) of the frequency domain RA field included in the DCI is different from the length required for the frequency resource field allocation information indicating the active DL BWP (or the active UL BWP), the present application can be applied with limitations. Here, the length (e.g., the number of bits) of the frequency domain RA field included in the DCI can be a value determined based on the number of RBs of the previous active BWP (or the previous active UL BWP) or the number of RBs of the initial BWP (or the initial UL BWP).

[0203] As an example of the present application, the UE can determine the DCI length according to the RA field length required for scheduling the currently activated BWP, and perform PDCCH blind decoding using the determined DCI length. The UE can differently interpret the RA according to the decoded DCI BPI value. For example, if the BPI indicates the currently active BWP, the UE interprets the value of the RA field as the RIV value for the currently active BWP. On the other hand, if the BPI indicates the BWP to be newly activated other than the currently activated BWP, the UE can interpret the RA field value as the RIV value for the newly activated BWP. In this case, the length of the RA field included in the DCI is referred to as K current , and the length of the RA field required for scheduling the newly activated BWP is referred to as K new . For example, K current = ceil(log2(N current *(N current +1) / 2)) and K new = ceil(log2(N new *(N new +1) / 2). Here, N current is the number of RBs included in the BWP (i.e., the currently activated BWP) in which the PDCCH is received, and N new is the number of RBs included in the newly activated BWP, where if K current is greater than or equal to K new , K new bits of the RA field can be used to (directly) indicate the RIV value of the BWP to be newly activated. And, the remaining K current -K newone bit is reserved as 0 or 1. For example, when K new bits of the RA field indicate an RIV value for the BWP to be newly activated, RB start and L CRB may have the following values.

[0204] -RB start = {0, 1, 2,..., N new - 1}, L CRB = {1, 2, 3,..., N new}

[0205] Here, N new ≤ N current , and L CRB ≤ N new -RB start .

[0206] On the other hand, if K current is less than K new , the following method can be considered.

[0207] Method 1

[0208] If K new > K current , M consecutive RBs can be selected among N new RBs of the BWP to be newly activated, and K current bits of the RA field can be interpreted as an RIV value for the M consecutive RBs. M can be determined as the maximum value among integer values satisfying K current ≥ ceil(log2(M*(M+1) / 2)). Alternatively, M = N current . Let the RB indices of the BWP to be newly activated be 1, 2,..., N new (or 0, 1,..., N new - 1). The starting RB (the RB having the lowest RB index, e.g., RB #A) of the M consecutive RBs selected from the newly activated BWP can be shown as an offset value from RB #0 of the BWP to be newly activated (e.g., RB #A = RB #0 + offset). For reference, the offset value can have one of 0, 1,..., N new -M.

[0209] Here, the offset value can be determined as follows.

[0210] - The offset value can be fixed to a specific value, e.g., 0.

[0211] - The offset value can be determined according to the lowest PRB index of the current active BWP where the PDCCH is monitored. For example, the minimum PRB index among the PRBs of the newly activated BWP overlapping the lowest PRB of the current activated BWP can be the offset value. If there is no overlapping PRB, the offset value can be fixed to a specific value, e.g., 0.

[0212] - The offset value can be determined according to the maximum PRB index of the current activated BWP. For example, the offset value can be obtained from the maximum PRB index (hereinafter, X) among the PRBs of the newly activated BWP overlapping the maximum PRB of the current activated BWP. Specifically, the offset can be obtained by X-M or max(X-M, 0). If there is no overlapping PRB, the offset value can be fixed to a specific value, e.g., 0.

[0213] - The offset value can be determined according to a specific value, e.g., the minimum PRB index and the maximum PRB index of the current active BWP. For example, the offset value can be obtained from the minimum PRB index (hereinafter, Y) of the PRBs of the newly activated BWP overlapping the minimum PRB of the current activated BWP and the maximum PRB index (hereinafter, X) among the PRBs of the newly activated BWP overlapping the maximum PRB of the current activated BWP. Specifically, the offset can be obtained by ceil((X+Y) / 2)-M or max(ceil((X+Y) / 2)-M, 0). If there is no overlapping PRB, the offset value can be fixed to a specific value, e.g., 0.

[0214] - The offset can be obtained from the CCE index of the CORESET where the PDCCH is received. For example, offset = CCE_index mod (N new -M+1). Here, the CCE_index can be the minimum CCE index, the maximum CCE index, or a value obtained by dividing the minimum CCE index by the aggregation level of the PDCCH to which the PDCCH is mapped.

[0215] - The offset can be determined according to the C-RNTI of the UE or a value derived from the C-RNTI. For example, offset = C-RNTI mod (N new -M+1). Thus, K current The bit RIV value can indicate whether to allocate the resources of the RBs #(1+(C-RNTI mod (N new -M+1))) to the RBs #(M+(C-RNTI mod (N new -M+1)). In addition, the offset can be determined using a pseudo-random sequence using the C-RNTI. For example, offset = g(C-RNTI) mod (N new- M+1). Here, g(C-RNTI) is a pseudo-random sequence created using C-RNTI. Here, since the offset is determined based on C-RNTI, the resource allocation due to the offset is different for the UE. However, from the perspective of one UE, the scheduling information for the RB is received in the same way regardless of the BWP switching time point.

[0216] - The offset can be determined according to a value derived from the C-RNTI of the UE and the slot index or a combination thereof. For example, offset = (n_slot + C-RNTI) mod (N new - M+1). Here, n_slot is the index of the slot in which the PDCCH is received or the index of the slot in which the PDSCH is allocated. Thus, K current The bit RIV value can indicate whether to allocate RB#(1+((n_slot+C-RNTI)mod(N new - M+1)) to RB#(M+((n_slot+C-RNTI)mod(N new - M+1)). As another example, a pseudo-random sequence using C-RNTI and the slot index can be used to determine the offset. For example, offset = (g(C-RNTI, n_slot) mod (N new - M+1). Here, g(C-RNTI, n_slot) is a pseudo-random sequence created using C-RNTI and n_slot. Here, since the offset is determined according to the BWP switching time point as well as C-RNTI, different UEs are differently allocated resources due to the offset at different time points.

[0217] Previously, the offset of the RB unit was described. However, the above-described method can be extended to the offset of a sub-BWP unit obtained by dividing the BWP. The sub-BWP unit offset is a method of dividing N new by a sub-BWP having X PRBs to indicate the index of the sub-BWP. For example, if the offset value is 0, it can refer to sub-BWP #0, and if the offset value is 1, it can refer to sub-BWP #1. Preferably, X = M.

[0218] Method 2-1

[0219] If K new > K current , the N new RBs of the BWP to be newly activated are grouped to form M RB sets, and the K current bits of the RA field can be interpreted as RIV values for the M RB sets. Here, the RB set can consist of consecutive RBs. Here, M can be determined to satisfy K currentThe maximum value among integers ≥ ceil(log2(M*(M+1) / 2)). Alternatively, M = N. current Let the RB index of the newly activated BWP be 1, 2, ..., N. new (or 0, 1, ..., N) new -1). N new The method for grouping RBs into M RB sets is as follows. Each of the first M1 RB sets can be ceil(N) new The M-M1 RB sets are divided into groups, and thereafter, each of the M-M1 RB sets can divide floor(N) into groups. new / M) RBs are divided into groups. Here, M1 is M1 = N new mod M.

[0220] Method 2-2

[0221] If K new >K current Then for the N of the newly activated BWP new The RBs are grouped to form M RB sets, and the K of the RA field can be... current Each bit is interpreted as a RIV value for M sets of RBs. Here, the RB sets can consist of consecutive RBs. Here, M can be determined as satisfying K current ≥ceil(log2(M*(M+1) / 2)) of ceil(N) new / 2 m The maximum value among (N). That is, M = ceil(N) new / 2 m ), m can be set to satisfy K current ≥ceil(log2(ceil(N new / 2 m )*(ceil(N new / 2 m Find the minimum value among the integers of (1) + 1) / 2). Let the RB index of the newly activated BWP be 1, 2, ..., N. new (or 0, 1, ..., N) new -1). N new The method for dividing BWP into M RB sets is as follows. If N new It is 2 m If the sum is a multiple of 2, then each of the M RB sets can make 2 m Divide N into groups. new Not 2 m If the sum is a multiple of 2, then each of the M-1 RB sets can make 2 m The N RBs are divided into groups, and a set of RBs can group N. new mod 2m The RBs are divided into groups.

[0222] Method 2-3

[0223] If K new >K current Then for the N of the newly activated BWP new The RBs are grouped to form M RB sets, and the K of the RA field can be... current Each bit is interpreted as a RIV value for M sets of RBs. Here, the RB sets can consist of consecutive RBs. Here, M can be determined as satisfying K current floor(N of ≥ceil(log2(M*(M+1) / 2)) new / 2 m The maximum value among (N). That is, M = floor(N) new / 2 m ), m can be set to satisfy K current ≥ceil(log2(floor(N new / 2 m )*(floor(N new / 2 m Find the minimum value among the integers of (1) + 1) / 2). Let the RB index of the newly activated BWP be 1, 2, ..., N. new (or 0, 1, ..., N) new -1). N new The method for dividing BWP into M RB sets is as follows. If N new It is 2 m If the sum is a multiple of 2, then each of the M RB sets can make 2 m Divide N into groups. new Not 2 m If the multiples of , then each of the M RB sets will have 2 m The RBs are divided into groups, and the UE can assume that the remaining N will not be scheduled. new -(M*2 m ) PRBs.

[0224] Method 3

[0225] Let A be the K of DCI current The value indicated in the bit frequency domain RA field. At this time, A can have values ​​of 0, 1, ..., 2^K. current -1. On the other hand, the RIV value required for scheduling the new BWP to be activated is 0, 1, ..., N. new *(N new +1) / 2)-1. When K new >Kcurrent At this time, the RIV value of the newly activated BWP can be obtained by using RIV = ceil(A*K), RIV = floor(A*K), or RIV = round(A*K). K = (N new *(N new +1) / 2) / (2^K current ), K = ceil((N new *(N new +1) / 2) / (2^K current )), K = floor((N new *(N new +1) / 2) / (2^K current )) or K = round((N new *(N new +1) / 2) / (2^K current )).

[0226] Method 4-1

[0227] If K new >K current Then in K current The value of the bit frequency domain RA field, under the assumption that the RIV value is used for the currently active BWP (i.e., the BWP that received the PDCCH), can determine the starting position S. current (For example, RB) start,current ) and length L current (For example, L) CRB,current ). RB start,current It can have {0,1,2,...,N} current One of the -1}, and L CRB,current It can have {1,2,3,...,N} current One of them. Here, N current This is the number of (P)RBs included in the currently active BWP. Simultaneously, by using RBs... start,current and L CRB,current Multiplying by K, the UE can obtain the starting position of the RB in the frequency resources (e.g., the RB set) allocated to the newly activated BWP (i.e., the BWP indicated by the BPI of the PDCCH). start and the number of consecutive RBs L CRB For example, RB start =ceil(K*RB) start,current ), RB start =floor(K*RB) start,current ) or RB start =round(K*RB) start,current ), and L CRB=ceil(K*L CRB,current ), L CRB =floor(K*L CRB,current ) or L CRB =round(K*L CRB,current Here, K = N new / N current K = ceil(N) new / N current ), K = floor(N) new / N current ) or K = round(N new / N current K can be restricted to powers of 2 (i.e., K = 1, 2, ..., 2). n (n is a non-negative integer). Specifically, K can be based on (N) new / N current ) has one of the powers of 2, and for example, can have K = 2^ceil(log2(N) new / N current )) or K = 2^floor(log2(N new / N current The value of ).

[0228] When K has one of the powers of 2, RB start =(S current *K) and L CRB =(L current *K). S current ={0,1,2,...,N current -1,L current ={1,2,3,...,N current}, and RB start and L CRB It can have the following values.

[0229] -RB start ={0,K,2*K,...,(N current -1)*K}

[0230] -L CRB ={K,2*K,3*K,...,N current *K}

[0231] Here, L CRB ≤N current *K-RB start And K can have {1,2,...,2} n One of the values. n is an integer greater than or equal to 0. It is possible to base (N) on... new / Ncurrent ) determines K. Here, a value satisfying K = 2ceil(log2(N new / N current )) or K = 2floor(log2(N new / N current )) can be given. For example, the K value can be given as follows based on (N new / N current ).

[0232] [Table 5]

[0233] X = (N new / N current )]]> 1<X≤2 2<X≤4 4<X≤8 8<X≤16 ... 2 n < X≤2 n+1 ]]> ceil(log2(N new / N current )]]> 1 2 3 4 ... n+1 K 2 4 8 16 ... 2 n+1 ]]

[0234] [Table 6]

[0235] X = (N new / N current )]]> 1<X<2 2≤X<4 4≤X<8 8≤X<16 ... 2 n ≤X<2 n+1 ]]> floor(log2(N new / N current )]]> 0 1 2 3 ... n K 1 2 4 8 ... 2 n ]]

[0236] For reference, since the maximum number of PRBs that one BWP can have is 275 PRBs, and the minimum number of PRBs is 20 PRBs occupied by the SS / PBCH block, N new / N current value is given below 13.75. Therefore, the K value obtained in Table 5 is one of 2, 4, 8, and 16, and the K value obtained in Table 6 is one of 1, 2, 4, and 8.

[0237] Method 4-2

[0238] When K new >K current , RB' current and L' CRB can be obtained by interpreting the value of the K start bit frequency domain RA field as an RIV value for a BWP having M PRBs. That is, RB' start can have one of {0, 1, 2,..., M-1}, and L' CRB can have one of {1, 2, 3,..., M}. Here, M can be the maximum value among integers satisfying K current ≥ log2(M*(M+1) / 2). Or, M = N current . Meanwhile, by multiplying RB' start and L' CRB by K, the UE can obtain RB start position and the number of consecutive RBs of the frequency resource (e.g., RB set) allocated to the BWP to be newly activated (i.e., the BWP indicated by the BPI of the PDCCH). For example, RB start = ceil(K*RB' start ), RB start=floor(K*RB') start ) or RB start =round(K*RB') start ), and L CRB =ceil(K*L' CRB ), L CRB =floor(K*L' CRB ) or L CRB =round(K*L' CRB Here, K = N new / M, K = ceil(N) new / M) or K = floor(N) new / M) or K = round(N) new / M). It is possible to restrict K to a power of two. K can be based on (N) new / M) has one of the powers of 2, for example, K = 2^floor(log2(N) new / M)) or K=2^ceil(log2(N) new For details, please refer to method 4-1.

[0239] When bitmap scheduling using RBG is used, the NR system can use values of 2, 4, 8, and 16 as the number of RBs included in one RBG (hereinafter, RBG size). Thus, as in Method 4-1 / 4-2, when K is limited to a power of 2, it is possible to easily multiplex different UEs of a cell in the frequency domain. Specifically, assume that UE A uses bitmap scheduling using RBG, and the RBG size is 8. Meanwhile, assume that UE B uses Method 4-1 / 4-2 and K is 3. Since K is 3, UE B divides K (= 3) consecutive RBs (hereinafter, RIV base unit) into groups and uses them for resource allocation. Here, K is an example in which it is not a factor of 8. In this case, two RIV base units are completely included in the RBG, but one RIV base unit is only partially included. Thus, when the RBG is allocated to UE A, UE B cannot use the RIV base unit that is only partially in the RBG, so resource waste can occur. Conversely, one of the RIV base units can partially overlap with two RBGs. In this case, if the RIV base unit is allocated to UE B, UE A cannot use the two RBGs that partially overlap with the RIV base unit, which can result in resource waste. On the other hand, if K is limited to a power of 2, it is possible to efficiently use resources among UEs. For example, assume that UE A uses bitmap scheduling using RBG, and the RBG size is 8. Assume that UE B uses Method 4-1 / 4-2 and K is 4. Since K is 4, UE B divides 4 consecutive RBs (hereinafter, RIV base unit) into groups and uses them for resource allocation. Here, K is a power of 2, so it is a factor of 8. In this case, two RIV base units are completely included in the RBG, and there is no case in which only a part of the RIV base unit is included. Thus, when the RBG is allocated to UE A, since UE B does not have a case in which only a part of the RIV base unit is included in the RBG, there is no wasted resource. Conversely, one RIV base unit can overlap with only one RBG. In this case, when the RIV base unit is allocated to UE B, UE A cannot use only one RBG that overlaps with the RIV base unit. If K is not given as a power of 2, two RBGs cannot be used, but if K is given as a power of 2, only one RBG cannot be used, so it is possible to more efficiently utilize resources.

[0240] Meanwhile, the reason for limiting K to a power of 2 in the method 4-1 / 4-2 is to facilitate multiplexing between different UEs. However, when different UEs have different BWPs, by grouping from the lowest RB of the BWP to configure the RBG, or by dividing K consecutive PRBs into groups to configure the RIV basic unit, resource waste can occur even if K is limited to a power of 2. For example, even if UE A configures one RBG with {PRB 0,1,2,3,4,5,6,7}, when UE B selects {PRB 1,2,3,4} and {PRB 5,6,7,8} as the basic unit of RIV of K(=4), it is not possible to completely include two RIV basic units of UE B in one RBG of UE A. Therefore, it is necessary to match the PRBs between the RBG and the RIV basic unit between two different UEs.

[0241] To solve the above problem, considering the PRB grid, resource allocation can be performed only in some PRBs among the to-be-newly-activated BWPs. Figure 15 (a) illustrates a case where two PRBs are grouped to form a PRB grid, and point A is indicated to the UE from the base station through a higher layer (e.g., RRC) signal. The RB index of the PRB grid represents the common PRB index. In other words, considering the PRB grid, the UE can be scheduled only in N' new PRBs among the N new PRBs of the to-be-newly-activated BWP. As an example, Figure 15 (b) illustrates a BWP consisting of N new PRBs, and Figure 15 (c) illustrates N' new PRBs that can be scheduled considering the PRB grid. Considering the PRB grid, a method of selecting N' new PRBs among the BWP consisting of N new PRBs will be described later. When the proposed method is applied, the RB start , L CRB , and K in the method 4-1 / 4-2 can be modified as follows. For details, refer to the method 4-1 / 4-2. In the method 4-3 / 4-4, "x" represents N new -N' new .

[0242] Method 4-3: modification to method 4-1

[0243] -RB start = ceil(K*RB start,current )+x, floor(K*RB start,current )+x, round(K*RB start,current )+x

[0244] - L CRB = ceil(K*L CRB,current ), floor(K*L CRB,current ), round(K*L CRB,current )

[0245] - K = N' new / N current , ceil(N' new / N current ), floor(N' new / N current ), round(N' new / N current )

[0246] K can be limited to a power of two. K can have one of the powers of 2 based on (N' new / N current ) and have a value satisfying, for example, K = 2^ceil(log2(N' new / N current )) or K = 2^floor(log2(N' new / N current )). When K is limited to a power of two, RB start = (S current *K) + x and L CRB = (L current *K). RB start and L CRB may have the following values.

[0247] - RB start = {0+x, K+x, 2*K+x,..., (N current -1)*K+x}

[0248] - L CRB = {K, 2*K, 3*K,..., N current *K}

[0249] Method 4-4: modification to method 4-2

[0250] - RB start = ceil(K*RB' start )+x, floor(K*RB' start )+x, round(K*RB' start )+x

[0251] - L CRB = ceil(K*L' CRB ), floor(K*L' CRB), round(K*L' CRB )

[0252] -K = N' new / M, ceil(N' new / M), floor(N' new / M), round(N' new / M)

[0253] K can be limited to a power of two. K can be based on (N' new / M) having one of the powers of two, and having a value satisfying, for example, K = 2ceil(log2(N' new / M)) or K = 2floor(log2(N' new / M)). When K is limited to a power of two, RB start = (K*RB' start )+x and L CRB = (K*L' CRB ). RB start and L CRB may have the following values.

[0254] -RB start = {0+x, K+x, 2*K+x,..., (M-1)*K+x}

[0255] -L CRB = {K, 2*K, 3*K,..., M*K}

[0256] Considering the PRB grid, a method of selecting N' new PRBs from a newly activated BWP consisting of N new PRBs is as follows. Let the PRB indices of the BWP be 0, 1,..., N new -1. The UE can select PRBs x, x+1,..., N new -1 as N' new PRBs. That is, the UE can select N' new PRBs having high indices among the PRBs. Here, x can be determined according to the PRB grid. For example, considering a PRB grid of RBG size 2, the value of x is 0 in the case where the common PRB index of the lowest PRB of the newly activated BWP is even and 1 in the case where it is odd. Referring to Figure 15, the common PRB index of the lowest PRB of the UE is 5. Thus, x=1 can be given. The common PRB index is an index in which RBs are numbered in order from a point A indicated by a higher layer (e.g., RRC). The common PRB index of one PRB is the same regardless of the BWP configured for the UE. As another example, when the RBG size that can be configured in the newly activated BWP is R, x can be a result value obtained by performing modulo R operation on the common PRB index of the lowest PRB of the newly activated BWP. Here, R can be the RBG size configured from a higher layer. If there is no RBG size configured from a higher layer, R can have the minimum value among the RBG sizes available in the BWP.

[0257] In methods 4-3 to 4-4, not all PRBs of the BWP are used for scheduling, but only some PRBs are used. A method for using all PRBs of the BWP for scheduling is as follows.

[0258] Method 2-4: modification to 2-1

[0259] If K new > N current , N new RBs of the new BWP are grouped to form M RB sets, and K current bits of the RA field can be interpreted as RIV values for the M RB sets. Here, the RB set can consist of consecutive RBs. Let the RB indices of the BWP to be newly activated be 1, 2,..., N new (or 0, 1,..., N new -1). The N new RBs are grouped into M RB sets as follows. Let K be the number of RBs that the RB set should contain. The K value can be a value configured from a higher layer (e.g., RRC) or a value obtained from N current and N new values. The K value can be determined as shown in Table 5 or Table 6 of method 4-1. Let N BWP start be the index of the starting RB of the BWP to be newly activated assigned according to the common PRB index. Then, M = ceil((N new +(N BWP start mod K)) / K) can be determined, and the first RB set includes K-(N BWP start mod K) RBs, and the last RB set can include (N BWP start +N new ) mod K>0. Here, the RB set can consist of consecutive RBs. BWP start +Nnew ) mod K RBs, otherwise it can include K RBs. The rest of the RB set contains K RBs. Here, the RBs are grouped in order from the lowest RB index.

[0260] Method 5-1

[0261] Meanwhile, as another example of the present application, when K new > 1 current , K current bits of the frequency domain RA field can be obtained according to the following equation.

[0262] [Equation 2]

[0263] If

[0264] RIV' = A S + L - 1

[0265] Otherwise

[0266] RIV' = A (N new - S + N new - A) + (A - L)

[0267] Here, N new is the number of (P)RBs of the BWP to be newly activated (i.e., the BWP indicated by the BPI of the PDCCH), S is one of {0, 1, 2,..., N new - 1}, and L is one of {1, 2, 3,..., A}. S + L can have one of {0, 1,..., N new - 1}. RIV' has a value of {0, 1,..., N new * A - (A - 1) * A / 2 - 1}. A can be determined according to K current bits. For example, A can be set to the maximum value of a natural number satisfying K current ≥ log2(N new * A - (A - 1) * A / 2) (not greater than N new ). The UE can find the S and L values from RIV' using the A value and the number N new of (P)RBs included in the BWP to be newly activated. The UE can obtain the RB start and the number of consecutive RBs of the frequency resource allocated to the BWP to be newly activated according to the S and L values. For example, RB start = S, and L CRB = ceil(L * K), L CRB = floor(L * K), or L CRB = round(L * K). Here, K = N new / A, K = ceil(Nnew / A) or K = floor(N new / A). K can be limited to a power of 2. In more detail, K can be based on (N new / A) has one of powers of 2, for example, K = 2^floor(log2(N new / A)) or K = 2^ceil(log2(N new / A)). According to this example, even if K current is less than K new , the starting position of the RB that can be scheduled can be all PRBs of the BWP to be newly activated.

[0268] Method 5-2

[0269] As another example of the present application, when K new > K current , K current can be obtained according to the following equation.

[0270] [Equation 3]

[0271] If

[0272] RIV" = (B+1)(L-1)+S

[0273] Otherwise

[0274] RIV" = (B+1)(N new -L+N new -B)+(B-S)

[0275] Here, N new is the number of (P)RBs of the BWP to be newly activated (i.e., the BWP indicated by the BPI of the PDCCH), S is one of {0, 1, 2,..., B}, and L is one of {1, 2, 3,..., N new}. S+L can have one of {0, 1,..., N new}. RIV" has a value of {0, 1,..., N new *(B+1)-(B*(B+1) / 2-1}. B can be determined according to K current bits. For example, B can be set to the maximum value of a non-negative integer value satisfying K current ≥ log2(N new *(B+1)A-B*(B+1) / 2) (not greater than N new ). The UE can use the B value and the number N new of PRBs included in the newly activated BWP.S and L values from the RIV”. The UE can obtain the number of RBs of the frequency resources allocated to the BWP to be newly activated and the number of consecutive RBs according to the S and L values start and L values. For example, RB start = ceil(S*K), RB start = ceil(L*K) or RB start = floor(S*K), and L CRB = L. Here, K = N new / (B+1), K = ceil(N new / (B+1)) or K = floor(N new / (B+1)). K can be limited to a power of 2. Here, K = 2^floor(log2(N new / (B+1))) or K = 2^ceil(log2(N new / (B+1)). According to this example, even if K current is smaller than K new , the number of consecutive RBs that can be scheduled can be all PRBs from 1 PRB of the BWP to be newly activated.

[0276] As another example of the present application, if the size of the RA field of the newly activated BWP indicated by the BPI is greater than the size of the RA field of the currently activated BWP, the UE can append ‘0’s to fit the size of the larger RA field. More specifically, when the size of the RA field of the currently activated BWP is referred to as K current and when the size of the RA field of the newly activated BWP is referred to as K new , after decoding the DCI, the UE can add K new -K current 0’s to the K current -length RA field and then interpret the DCI field value (e.g., K new -length RA). Here, the position regarding the addition of K new -K current 0’s can consider the following methods.

[0277] For example, the UE can append K new -K current 0’s to the front (before the MSB) of the K current -length RA field. By using K currentThe value of the RA field of the length K

[0278] As another example, the UE can append K new -K current 0s to the rear (after the LSB) of the RA field of the length K current The value of the RA field of the length K current By subtracting a certain value from the resource allocation range that the value of the RA field of the length K current may have, flexibility can be provided as much as possible without scheduling limitations when allocating resources in the newly activated BWP. For example, when the resource allocation range that the value of the RA field of the length K new may have is {0, 1, 2,..., 9} and the size of the newly activated BWP is doubled, by adding '0' to the LSB of the RA field, the resource allocation range in the newly activated BWP can be {0, 2, 4, 6, 8, 10,..., 18}. By doing so, in the case where BWP switching is performed, flexibility can be provided as much as possible without scheduling limitations when allocating resources in the BWP to be newly activated.

[0279] As another example, the UE can append P current 0s of K current 0s to the front (before the MSB) of the RA field of the length K current , and append Q new 0s to the rear (after the LSB) of the RA field of the length K current . Here, P + Q = K new -K current + 1. P (or Q) can be obtained from the remainder of R divided by (K new -K current + 1). Here, R can be obtained from the C-RNTI of the UE. For example, P = C-RNTI mod (K new -K current + 1), Q = K new -K current + 1 - P. Further, R can be obtained from the C-RNTI of the UE and the slot index. For example, P = (C-RNTI + ns) mod (K new -Kcurrent -P. Here, ns denotes a slot index. An additional random number can be included in the equation for obtaining P. In addition, P (or Q) can be determined according to a maximum value that RIV can have. For example, when a BWP to be newly activated (e.g., a BWP indicated by BPI of a PDCCH) consists of N new PRBs, RIV values that can be had are 0, 1,..., N new *(N new +1) / 2-1. Here, let RIV_max = N new *(N new +1) / 2-1. At this time, Q values can be given as a maximum value among integers smaller than log2(RIV_max / (2^K current -1)). That is, RIV values (00...0 to 11...1) obtained by appending Q number of 0s to the rear (after LSB) of a K current length RA field can always be within the RIV range of a newly activated BWP.

[0280] As another example of the present application, when K new > K current , a UE using an RIV method can perform RIV value interpretation as follows. In the above example, the UE can append P number of 0s among K new -K current number of 0s to the front (before MSB) of a K current length RA field, and append Q number of 0s to the rear (after LSB) of the K current length RA field. Let us assume that a value obtained by interpreting K new bits in this way is RIV_temp. The UE can assume that a remainder obtained by dividing RIV_temp+N by RIV_max+1 is an RIV value. Here, N can be a different value for each UE, for example, can be a C-RNTI of the UE. In addition, N can be a different value for each slot, for example, can be a slot index. Further, N can be a remainder after dividing a C-RNTI or a slot index of the UE by 2^Q.

[0281] Meanwhile, in the NR system, a UE using the RIV method can be configured with frequency hopping. When frequency hopping is configured, a 1-bit frequency hopping flag can be transmitted to DCI scheduling a PDSCH or a PUSCH. For example, if the 1-bit frequency hopping flag is 0, frequency hopping can not be performed, and if the 1-bit frequency hopping flag is 1, frequency hopping can be performed. If the 1-bit frequency hopping flag is 1, the UE interprets 1 or 2 bits in the RA field as frequency hopping-related information. For example, if the number of PRBs included in a BWP is 50 PRBs or less, one bit in the RA field can be interpreted as frequency hopping-related information, and if the number of PRBs included in the BWP exceeds 50 PRBs, 2 bits in the RA field can be interpreted as frequency hopping-related information. The UE can use the 1-bit or 2-bit frequency hopping-related information to learn a PRB difference or a PRB offset value between a second hop and a first hop. When instructed to perform frequency hopping, the UE divides a PDSCH or a PUSCH in the time domain, can receive / transmit a first hop in a PRB indicated from the RA field, and can receive / transmit a second hop by a PRB obtained from the PRB indicated from the RA field and the PRB offset value.

[0282] Similarly to the foregoing, let the length of the RA field included in the DCI be K current and let the length of the RA field required for a newly activated BWP (e.g., a new BWP indicated by the BPI of the PDCCH) be K new When K new ≤ K current , the UE can normally perform a frequency hopping operation. For example, as described above, if the 1-bit frequency hopping flag is 0, frequency hopping can not be performed, and if the 1-bit frequency hopping flag is 1, frequency hopping can be performed. If the 1-bit frequency hopping flag is 1, the UE can interpret 1 or 2 bits in the RA field as frequency hopping-related information as described above. Meanwhile, when K new > K current , the UE can perform the following operation.

[0283] For example, when K new > K current , it can be assumed that a UE using the RIV method does not always perform frequency hopping. Accordingly, the UE can interpret the 1-bit frequency hopping flag as the RA field. Here, it can be interpreted by placing the 1-bit frequency hopping flag in front of the RA field (before the MSB). Further, it can be interpreted by placing the 1-bit frequency hopping flag after the RA field (after the LSB).

[0284] As another example, when K new > K currentWhen a UE using the RIV method is instructed to perform frequency hopping, the UE can interpret 1 bit or 2 bits in the RA field as frequency hopping related information. The number of bits of the frequency hopping related information can vary according to the bandwidth of the BWP. For example, the number of bits of the frequency hopping related information (e.g., 1 bit or 2 bits) can be determined based on the newly activated BWP. For example, if the number of PRBs included in the newly activated BWP is 50 RBs or less, the UE can consider 1 bit as the frequency hopping related information, and if it is greater than 50 RBs, 2 bits as the frequency hopping related information. For example, the number of bits of the frequency hopping related information (e.g., 1 bit or 2 bits) can be determined based on the currently activated BWP. For example, if the number of PRBs included in the currently activated BWP is 50 RBs or less, the UE can consider 1 bit as the frequency hopping related information, and if it is greater than 50 RBs, 2 bits as the frequency hopping related information.

[0285] Meanwhile, the RIV method can be used in the NR system to configure a VRB-to-PRB mapping for a UE. When the VRB-to-PRB mapping is configured, a 1-bit VRB-to-PRB mapping flag can be transmitted to the DCI scheduling the PUSCH. For example, if the VRB-to-PRB mapping flag is 0, the VRB-to-PRB mapping is not performed, and if the VRB-to-PRB mapping flag is 1, the VRB-to-PRB mapping can be performed. When instructed to perform the VRB-to-PRB mapping, the UE can first obtain the allocated VRB from the RIV value. Thereafter, the UE can obtain the relationship between the VRB and the PRB through a block interleaver. Here, the VRB has the same number as the PRB.

[0286] Similarly to the foregoing, let the length of the RA field included in the DCI be K current and let the length of the RA field required for the newly activated BWP (the BWP indicated by the BPI of the PDCCH) be K new When K new ≤ K current , the UE can normally perform the VRB-to-PRB mapping operation. For example, as described above, the UE can not perform the VRB-to-PRB mapping when the VRB-to-PRB mapping flag is 0, and can perform the VRB-to-PRB mapping when the VRB-to-PRB mapping flag is 1. Meanwhile, when K new > K current , the UE can perform the following operation.

[0287] For example, when K new > K current , it can be assumed that the UE using the RIV method does not always perform the VRB-to-PRB mapping. Or, it can be assumed that the UE always performs the VRB-to-PRB mapping. Thus, when K new > Kcurrent When the 1-bit VRB-to-PRB flag is used, the UE using the RIV method can interpret the 1-bit VRB-to-PRB flag as the RA field. Here, it can be interpreted by placing the 1-bit VRB-to-PRB flag in front of (before the MSB of) the RA field. In addition, it can be interpreted by placing the 1-bit VRB-to-PRB after (after the LSB of) the RA field.

[0288] On the other hand, as an example of the present application, when a specific field in the DCI is configured as follows, the UE using the RIV method can determine that the PDSCH or PUSCH is not scheduled. On the other hand, the UE should assume that the BWP to be newly activated (for example, the BWP indicated by the BPI of the PDCCH) is the active BWP. Through this method, the UE can switch the BWP without scheduling a separate PDSCH or PUSCH.

[0289] - Option 1: All RA fields consist of bit 1.

[0290] - Option 2: All RA fields consist of bit 1, and all 5-bit modulation and coding scheme (MCS) fields consist of bit 1.

[0291] - Option 3: All RA fields consist of bit 1, and all 2-bit redundancy version (RV) fields consist of bit 1.

[0292] - Option 4: All RA fields consist of bit 1, all 5-bit MCS fields consist of bit 1, and all 2-bit RV fields consist of bit 1.

[0293] Meanwhile, in the 3GPP NR system, a UE can be configured to receive a fallback DCI (or a fallback DCI scheduling a PUSCH) scheduling a PDSCH. For example, the fallback DCI scheduling a PDSCH can include a DCI format 1_0, and the fallback DCI scheduling a PUSCH can include a DCI format 0_0. In this case, the fallback DCI always uses a frequency domain resource allocation method of an RIV method, and a length (e.g., a number of bits) of a frequency domain RA field is determined according to a number of PRBs of an initial DL BWP (or an initial UL BWP). For example, if the initial DL BWP (or the initial UL BWP) has N PRBs, a length (e.g., a number of bits) of the frequency domain RA field of the fallback DCI can be determined by ceil(log2(N*(N+1) / 2))). Generally, since a number of PRBs of an active DL BWP (or an active UL BWP) of a UE is different from a number of PRBs of the initial DL BWP (or the initial UL BWP), a length (or a number of bits) of a frequency resource allocation field required for frequency domain resource allocation of the active DL BWP (or the active UL BWP) can be different from a length (or a number of bits) of the frequency resource allocation field transmitted in the fallback DCI. Accordingly, the above-described problem can be solved in the same manner as proposed above. In other words, the currently activated BWP in the previous description (methods 1 to 5-2, etc.) can be replaced with the initial BWP, and the newly activated BWP (the BWP indicated by the BPI of the PDCCH) can be replaced with the active BWP. For example, when applied to method 4-1, the RB start , L CRB , and K in method 4-1 can be modified as follows. For details, reference can be made to method 4-1.

[0294] Method 4-5: modification to method 4-1

[0295] The length of the RA field in the DCI is K initial = ceil(log2(N initial *(N initial +1) / 2)), and the length of the RA field required for scheduling the active BWP can be obtained by K active = ceil(log2(N active *(N active +1) / 2)). Here, N initial is the number of (P)RBs of the initial BWP, and N active is the number of (P)RBs of the active BWP. When K active > K initial , the RB start and L CRB corresponding to the RB set allocated to the active BWP can be determined as follows.

[0296] -RB start = ceil(K*RB start,initial ), floor(K*RB start,initial ), round(K*RB start,initial )

[0297] -L CRB = ceil(K*L CRB,initial ), floor(K*L CRB,initial ), round(K*L CRB,initial )

[0298] -K = N active / N initial , ceil(N active / N initial ), floor(N active / N initial ), round(N active / N initial )

[0299] When K is limited to a power of 2, RB start = (S initial *K), and L CRB = (L initial *K). RB start and L CRB may have the following values.

[0300] -RB start = {0, K, 2*K,..., (N initial -1)*K}

[0301] -L CRB = {K, 2*K, 3*K,..., N initial *K}

[0302] Here, L CRB ≤ N initial *K-RB start , and K can have one of {1, 2,..., 2 n} values. n is an integer greater than or equal to 0. K can be determined based on (N active / N initial ). Here, a value satisfying K = 2^ceil(log2(N active / N initial )) or K = 2^floor(log2(N active / N initial )) can be given. For example, K values can be given as follows based on (N active / N initial ).

[0303] [Table 7]

[0304] X = (N active / N initial )]]> 1<X≤2 2<X≤4 4<X≤8 8<X≤16 ... 2 n < X≤2 n+1 ]]> ceil(log2(N active / N initial )]]> 1 2 3 4 ... n+1 K 2 4 8 16 ... 2 n+1 ]]

[0305] [Table 8]

[0306] X = (N active / N initial )]]> 1<X<2 2≤X<4 4≤X<8 8≤X<16 ... 2 n ≤X<2 n+1 ]]> floor(log2(N active / N initial )]]> 0 1 2 3 ... n K 1 2 4 8 ... 2 n ]]

[0307] For reference, since the maximum number of PRBs that one BWP can have is 275 PRBs, and the minimum number of PRBs occupied by the initial PRB is 24 PRBs, N active / N initial is given as 13.46 or less. Thus, the K value obtained in Table 7 is one of 2, 4, 8, and 16, and the K value obtained in Table 8 is one of 1, 2, 4, and 8.

[0308] Figure 16 FIG. illustrates a data transmission procedure according to an embodiment of the present application. Figure 16 FIG. illustrates a data transmission procedure according to methods 4-1 and 4-5. Specifically, Figure 16 (a) illustrates an uplink data transmission procedure according to an embodiment of the present application, and Figure 16 (b) illustrates a downlink data transmission procedure according to an embodiment of the present application.

[0309] Referring to Figure 16 (a) and Figure 16 (b), the UE can receive scheduling information (e.g., DCI) including resource allocation information (S1602). The scheduling information can include uplink scheduling information (e.g., UL grant DCI) (e.g., DCI format 0_0, 0_1) Figure 16 (a)) or downlink scheduling information (e.g., DL grant DCI) (e.g., DCI format 1_0, 1_1) Figure 16 (b)). The DCI can be received through a PDCCH. Here, the resource allocation information includes RIV determined based on the first BWP, specifically, the number of RBs of the first BWP. Thereafter, the UE can use the scheduling information to transmit uplink data (e.g., PUSCH) or receive downlink data (e.g., PDSCH) in the second BWP (S1604). Specifically, the UE can transmit the PUSCH Figure 16 (a)) or receive the PDSCH Figure 16 (b)) on the RB set corresponding to the RIV in the second BWP. The second BWP can be a BWP indicated by the BPI in the scheduling information or an active BWP.

[0310] Here, when the number of RBs of the second BWP is greater than that of the first BWP, the starting RB index S and the number of RBs L of the RB set corresponding to the RIV in the second BWP can be given as one of the following values:

[0311] - Starting RB index S: {0, K, 2*K,..., (N BWP1 -1)*K}, and

[0312] - Number of RBs L: {K, 2*K, 3*K,..., N BWP1 *K}

[0313] Here, N BWP1 is the number of RBs of the first BWP, and K is a power of 2 and can be determined based on (the number of RBs of the second BWP / the number of RBs of the first BWP).

[0314] Preferably, the first BWP and the second BWP can include one of the following:

[0315] 1) (first BWP, second BWP) = (initial BWP, active BWP), and

[0316] 2) (first BWP, second BWP) = (currently activated BWP, newly activated BWP).

[0317] Here, in the case of 1), the DCI includes fallback DCI (e.g., DCI format 0_0, 1_0), and both the DCI and data (e.g., PUSCH, PDSCH) can be transmitted and received in the second BWP (i.e., the active BWP). In the case of 2), the currently activated BWP is the active BWP at the point of time when the scheduling information is transmitted, and the newly activated BWP is the BWP indicated by the BPI in the scheduling information. That is, in the case of 2), BWP switching is involved, and the DCI (e.g., DCI format 0_0, 0_1, 1_0, 1_1) is received through the first BWP, and the second BWP can be the BWP indicated by the BPI in the DCI.

[0318] Preferably, K can have the following values according to (the number of RBs of the second BWP / the number of RBs of the first BWP):

[0319] [Table 9]

[0320] 1<X<2 2≤X<4 4≤X<8 8≤X<16 ... 2 n ≤X<2 n+1 ]]> K 1 2 4 8 ... 2 n ]]

[0321] Here, X is (the number of RBs of the second BWP / the number of RBs of the first BWP), and n is an integer of 0 or more.

[0322] Preferably, the RIV can have a value satisfying the following equation:

[0323] - If (L'-1) ≤ floor(N BWP1 / 2), RIV = N BWP1 *(L'-1) + S', and

[0324] - If (L'-1) > floor(N BWP1 / 2), RIV = N BWP1 *(N BWP1 -L'+1) + (N BWP1 -1-S'),

[0325] Here, L' has a value of 1 ≤ L' ≤ N BWP1 -S' as L / K, and S' is S / K.

[0326] Preferably, when the number of RBs of the second BWP is equal to or smaller than the number of RBs of the first BWP, the starting RB index S and the number of RBs L of the RB set corresponding to the RIV in the second BWP can be given as one of the following values:

[0327] - Starting RB index S: {0, 1, 2,..., N BWP2 -1}, and

[0328] - Number of RBs L: {1, 2, 3,..., N BWP2},

[0329] Here, N BWP2 is the number of RBs of the second BWP, and N BWP2 ≤ N BWP1 .

[0330] Preferably, when the size of the RA field in the DCI is referred to as K BWP1 , and the size of the RA field required to schedule the second BWP is K BWP2 , in the case of K BWP1 <K BWP2 , the UE can decode the DCI and then append K BWP2 -K BWP1 zeros to the K current -sized RA field, and then interpret the DCI field value (e.g., K BWP2 -sized RA). For example, the UE can append K BWP2 -K BWP1 zeros to the front (before the MSB) of the K DCI -sized RA field.

[0331] Embodiment 3: UL BWP change

[0332] Another problem to be addressed in the present disclosure relates to a case where the UE fails to receive the DCI carrying the UL BWP switching information. The DCI delivering the switching information of the UL BWP can include the BPI for the UL BWP. In this case, the UE can determine that the UL BWP indicated by the BPI of the DCI is the active UL BWP. In order to receive the DCI (DCI format 0_1) for scheduling the PUSCH, the UE needs to know the length (e.g., the number of bits) of the frequency domain resource allocation field included in the DCI. For example, the length of the frequency domain resource allocation field of the UE configured with RA type 0 (bitmap method) is equal to the number of RBGs included in the active UL BWP, while the length of the frequency domain RA field of the UE configured with RA type 1 (RIV method) is equal to ceil(log2(N_PRB*(N_PRB+1) / 2)). Here, N_PRB is the number of PRBs of the active UL BWP. That is, in order to know the length (e.g., the number of bits) of the DCI that the UE monitors in order to receive the PUSCH scheduling information, it is necessary to know the number of PRBs of the active UL BWP. If the reception of the DCI indicating the UL BWP change fails, since the UE continuously monitors the DCI length according to the number of PRBs of the previous UL BWP, a problem can occur in which the DCI transmitted from the base station cannot be received (i.e., the DCI whose length is determined according to the number of PRBs of the new UL BWP).

[0333] In order to solve the above problem, the length of the DCI (e.g., DCI format 0_1) scheduling the PUSCH can be made independent of which UL BWP is the active UL BWP. For example, the length of the DCI (e.g., DCI format 0_1) for scheduling the PUSCH can be matched with the longest DCI length among the DCI lengths derived from each UL BWP. For example, padding bits can be added to the DCI (e.g., DCI format 0_1) to match the length of the DCI derived from a specific UL BWP with the length of the longest DCI. As another example, the length of the DCI (e.g., DCI format 0_1) for scheduling the PUSCH can be matched with the DCI length derived from a specific UL BWP. Here, the specific UL BWP can be the UL BWP having the lowest index (or UL BWP ID) among the UL BWPs. In addition, the specific UL BWP can be the UL BWP having the same index (or DL BWP ID) as the active DL BWP. For reference, the UE can be configured with up to 4 DL BWPs and UL BWPs in one cell through an RRC signal, and when the above configuration is received, the UE can be configured with the index (or ID) of the BWP. In order to find the frequency domain resource allocation information in the active UL BWP, the methods of embodiments 1 to 2 can be used as a method of analyzing the frequency domain RA field.

[0334] As another example of the disclosure, the length of DCI (e.g., DCI format 0_1) scheduling PUSCH can be determined according to the active DL BWP. For example, the length (e.g., number of bits) of the frequency domain RA field of DCI (DCI format 0_1) scheduling PUSCH can be determined according to the number of PRBs of the active DL BWP regardless of which UL BWP is the active UL BWP. To find out the frequency domain resource allocation information in the active UL BWP, the methods of embodiments 1 to 2 can be used as a method of analyzing the frequency domain RA field.

[0335] As another example of the disclosure, DCI (e.g., DCI format 1_1) scheduling PDSCH can include information about which UL BWP is the active UL BWP. For example, up to 2 bits can be included in the DCI to indicate which UL BWP is the active UL BWP. Thus, when receiving DCI (e.g., DCI format 1_1) scheduling PDSCH, the UE is able to know the length of DCI (e.g., DCI format 0_1) scheduling PUSCH based on the active UL BWP indicated by the DCI.

[0336] As another example of the disclosure, fallback DCI (e.g., DCI format 0_0) scheduling PUSCH can include information about which UL BWP is the active UL BWP. For reference, the length (e.g., number of bits) of fallback DCI is fixed regardless of the active UL BWP size. Thus, if receiving fallback DCI (e.g., DCI format 0_0) scheduling PUSCH, the UE is able to know the length of DCI (e.g., DCI format 0_1) scheduling PUSCH based on the active UL BWP indicated by the DCI. Here, 2 bits can be added to fallback DCI (e.g., DCI format 0_0) scheduling PUSCH to indicate which UL BWP is the active UL BWP. Meanwhile, without additional bits, another field of fallback DCI (e.g., DCI format 0_0) scheduling PUSCH can be re-interpreted to indicate which UL BWP is the active UL BWP. For example, if the values of the 5-bit MCS field and the 2-bit RV field of fallback DCI (e.g., DCI format 0_0) are a certain combination (e.g., 11111 and 11), the UE is able to determine that PUSCH is not scheduled and use some bits of the frequency domain RA field to determine which UL BWP is the active UL BWP.

[0337] Meanwhile, the fallback DCI that receives the scheduling PUSCH (e.g., DCI format 0_0) and the fallback DCI can indicate the PUSCH retransmission of the non-fallback DCI (e.g., DCI format 0_1) indicating the UL BWP change and the PUSCH transmission. In this case, the UE can always ignore the UL BWP change indicated by the non-fallback DCI and transmit the PUSCH in the previous UL BWP. Meanwhile, if the non-fallback DCI (e.g., DCI format 0_1) indicating the UL BWP change and the PUSCH transmission is not received, the UE can transmit the PUSCH in the current UL BWP.

[0338] Embodiment 4: SPS / CS PDSCH reception

[0339] If the UE does not receive the DCI in the active DL BWP for a certain period of time, the UE can perform switching to the default DL BWP for the purpose of power saving. Specifically, the UE can be configured with a timer (e.g., BWP-Inactivitytimer) for the PCell or the SCell through the RRC signal. If the UE configured with the timer does not receive the DCI every 1 ms (or 0.5 ms in FR2 (a carrier whose frequency is 6 GHz or more)), it increases the timer. Here, the DCI is DCI format 1_1 and DCI format 0_1 in the cell using unpaired spectrum and DCI format 1_1 in the cell using paired spectrum. When the timer of the UE reaches a certain value, the UE performs switching to the default DL BWP.

[0340] Meanwhile, the UE can be configured to receive the PDSCH configured with the RRC signal (or configured with the RRC signal and activated with the L1 signal). This is called semi-persistent scheduling (SPS) or configured scheduling (CS). Meanwhile, when the SPS / CS-based PDSCH is transmitted / received, there is no corresponding DCI in the PDSCH. Therefore, when the SPS / CS is configured, even if the UE receives the PDSCH, the UE does not receive the corresponding DCI. Therefore, even if the PDSCH is received, the timer configured for the UE is increased, and when a predetermined value is reached, switching to the default DL BWP is performed. That is, even if there is the PDSCH consisting of the RRC signal (or consisting of the RRC signal and activated with the L1 signal), the UE switches to the default DL BWP. Hereinafter, a solution to the above problem will be described.

[0341] As another example of the present disclosure, if configured to receive a PDSCH consisting of an RRC signal (or consisting of an RRC signal and activated by an L1 signal), the UE can determine whether to perform a timer operation according to a transmission period of the SPS / CS-based PDSCH. For example, the UE can not perform a timer operation when the transmission period is longer than a predetermined size, but can perform a timer operation when the transmission period is shorter than the predetermined size. Conversely, the UE can not perform a timer operation when the transmission period is shorter than the predetermined size, but can perform a timer operation when the transmission period is longer than the predetermined size.

[0342] As another example of the present disclosure, if configured to receive a PDSCH consisting of an RRC signal (or consisting of an RRC signal and activated by an L1 signal), the UE can determine whether to perform a timer operation according to a transmission period of the SPS / CS-based PDSCH. For example, the UE can not perform a timer operation when the transmission period is longer than a predetermined size, but can perform a timer operation when the transmission period is shorter than the predetermined size. Conversely, the UE can not perform a timer operation when the transmission period is shorter than the predetermined size, but can perform a timer operation when the transmission period is longer than the predetermined size.

[0343] As another example of the present disclosure, if configured to receive a PDSCH consisting of an RRC signal (or consisting of an RRC signal and activated by an L1 signal), the UE can determine whether to perform a timer operation according to a frequency allocation of the PDSCH. For example, the UE can perform a timer operation when a frequency resource allocated to the PDSCH is included in a default DL BWP, and can not perform a timer operation in the case where the frequency resource allocated to the PDSCH is not included in the default DL BWP. Here, even if the UE performs switching to the default DL BWP according to the timer operation, the UE can receive the configured PDSCH.

[0344] As another example of the present disclosure, the UE configured to receive a PDSCH consisting of an RRC signal (or consisting of an RRC signal and activated by an L1 signal) always performs a timer operation, and when switching to a default DL BWP according to the timer operation, the UE can determine whether to receive the PDSCH according to a frequency allocation of the PDSCH. For example, if a frequency resource allocated to the PDSCH is included in the default DL BWP, the UE can receive the PDSCH after switching to the default DL BWP. Otherwise, the UE can determine that the PDSCH has been deactivated or released after switching to the default DL BWP.

[0345] Embodiment 5: resource allocation region

[0346] Another problem to be solved in the present disclosure relates to a method for a UE to interpret a frequency domain RA field of a DCI in order to receive a broadcast channel of a base station. Here, a broadcast channel of a base station is transmitted on a PDSCH, and a DCI for transmitting the broadcast channel is a DCI scrambled (or addressed) with a system information-RNTI (SI-RNTI) or a paging-RNTI (P-RNTI). The DCI is a DCI format 1_0 (fallback DCI). The UE can monitor a PDCCH transmitting the DCI in a common search space of a CORESET.

[0347] The length (or the number of bits) of the frequency domain RA field of the DCI can be determined according to the number N initial of PRBs occupied by the initial DL BWP. That is, the length (or the number of bits) of the frequency domain RA field is K initial = ceil(log2(N intial *(N intial +1) / 2)). The frequency domain RA field of the DCI can indicate resource allocation information of a frequency domain of a PDSCH in an RIV method. An RIV value indicates a starting RB and the number of consecutive RBs of the PDSCH.

[0348] Generally, the initial DL BWP in which each UE is operating can be different. Referring to Figure 17 , UE A and UE B can have different active DL BWPs. Here, the active DL BWP refers to a frequency band or a set of (consecutive) PRBs in which the UE should receive a DL signal. Referring to Figure 17 , in UE A, BWP #1 can be configured as an active DL BWP, and in UE B, BWP #2 can be configured as an active DL BWP. Here, the active DL BWPs BWP #1 and BWP #2 in which the two UEs are operating can overlap each other. In addition, by configuring a CORESET on the overlapping active DL BWPs, the two UEs can monitor it. That is, even though the active DL BWPs are different, two different UEs can monitor the same CORESET. Further, two different UEs can have the same BWP. For example, in order to receive a PDCCH transmitting remaining minimum system information (RMSI) and a PDSCH transmitting the RMSI in an initial access procedure, the UE can configure an initial DL BWP through a physical broadcast channel (PBCH). Further, the UE can configure a default DL BWP as a fallback BWP through an RRC signal. When the default DL BWP is configured, if the UE does not receive a DCI from an active DL BWP for a certain period of time, the UE can switch the BWP to the default DL BWP.

[0349] Next, when the DCI for the broadcast channel is received in CORESET, it is recommended that the UE use the PRB index RB to find the broadcast channel in the active DL BWP from the frequency domain RA field of the DCI. start and length L CRB The method.

[0350] First, the UE can find the relative starting PRB index RB from the frequency domain RA field of the DCI. start,temp and length L CRB For example, the UE can obtain the RB by interpreting the RIV value using the number of RBs included in the initial DL BWP. start,temp and L CRB As another example, the UE can obtain the RB by interpreting the RIV value using the maximum number M of RBs. start,temp and L CRB M is K initial The maximum number of PRBs that the RA field in the bit frequency domain can represent, and which satisfies ceil(log2(M*(M+1) / 2))≤ceil(log2(N)). initial *(N initial The largest natural number of the range M + 1) / 2). Or, M = N initial The UE can use the relative starting PRB index RB. start,temp Obtain the actual PRB index RB in the activity DL BWP start As RB start =RB start_temp +Reference. Here, reference is a non-negative integer and can be obtained as follows.

[0351] For example, refer to Figure 18 The UE can obtain a reference based on the inclusion relationship between the active DL BWP and the initial DL BWP, and use this reference to determine the starting index RB of the PRB where the broadcast channel is located in the active DL BWP. start Specifically, if the UE's active DL BWP completely includes the initial DL BWP, and the subcarrier spacing between the active DL BWP and the initial DL BWP is the same, then the UE can assume that it can transmit a broadcast channel in the PRB overlapping with the initial DL BWP within the active DL BWP. That is, it can transmit via the lowest common RB index (CRB) of the initial DL BWP. initial The lowest common RB index CRB of the activity DL BWP active The difference between them determines the reference. That is, reference = CRB. initial -CRB active Therefore, the PRB index at the start of the broadcast channel in an active DL BWP can be determined as RB. start=RB start_temp +Reference = RB start_temp +CRB initial -CRB active Here, the CRB (Common RB) index is an index of the RBs grouped according to the subcarrier spacing, starting from absolute point A in the frequency domain. The subcarrier spacing used to determine the CRB index is the same as the subcarrier spacing between the initial DL BWP and the active DL BWP.

[0352] As another example, see Figure 19 The UE can obtain a reference based on the inclusion relationship between the current DL BWP and the initial DL BWP, and use this reference to determine the starting index RB of the PRB where the broadcast channel is located in the active DL BWP. start Specifically, when the active DL BWP does not completely include the initial DL BWP (e.g., they are disjoint or partially overlap), or when the subcarrier spacing between the active DL BWP and the initial DL BWP is different, the UE can obtain the PRB through which the broadcast channel is transmitted based on the PRB where the CORESET of the scheduling broadcast channel is located. That is, the lowest common RB index CRB that determines the CORESET of the scheduling broadcast channel can be used as the reference. CORESET The lowest common RB index CRB of the activity DL BWP active The difference between them. That is, reference = CRB. CORESET -CRB active Therefore, the PRB index at the start of the broadcast channel in an active DL BWP can be determined as RB. start =RB start_temp +Reference = RB start_temp +CRB CORESET -CRB active .

[0353] As another example, the UE can obtain a reference based on the inclusion relationship between the active DL BWP and a specific DL BWP, and use this reference to determine the starting index RB of the PRB where the broadcast channel is located in the active DL BWP. start Specifically, if the UE's active DL BWP completely encompasses the specific DL BWP, and the subcarrier spacing between the active DL BWP and the specific DL BWP is the same, then the UE can assume that it can transmit a broadcast channel in the PRB overlapping with the specific DL BWP within the active DL BWP. That is, it can transmit via the lowest common RB index (CRB) of the specific DL BWP. selected The lowest common RB index CRB of the activity DL BWP active The difference between them determines the reference. That is, reference = CRB.selected -CRB active . Thus, the PRB index where the broadcast channel starts in the active DL BWP can be determined as RB start = RB start_temp + reference = RB start_temp + CRB selected -CRB active . Here, one specific DL BWP can be configured as a higher layer (e.g., RRC) signal from the base station to the UE. In addition, one specific DL BWP can be a default BWP configured with a higher layer (e.g., RRC) signal from the base station to the UE.

[0354] As another example, with reference to Figure 19 , the UE can obtain a reference according to an inclusion relationship between the active DL BWP and one specific DL BWP, and use the reference to determine the starting index RB start of the PRB where the broadcast channel is located in the active DL BWP. Specifically, when the active DL BWP does not completely include the specific DL BWP (e.g., disjoint or partially overlap) or the subcarrier spacing between the active DL BWP and the initial DL BWP is different, the UE can obtain the PRB through which the broadcast channel is transmitted according to the PRB where the CORESET scheduling the broadcast channel is located. That is, the reference can be determined as the difference between the lowest common RB index CRB CORESET of the CORESET scheduling the broadcast channel and the lowest common RB index CRB active of the active DL BWP. That is, reference = CRB CORESET -CRB active . Thus, the PRB index where the broadcast channel starts in the active DL BWP can be determined as RB start = RB start_temp + reference = RB start_temp + CRB CORESET -CRB active . Here, one specific DL BWP can be configured with a higher layer (e.g., RRC) signal from the base station to the UE. In addition, one specific DL BWP can be a default BWP configured with a higher layer (e.g., RRC) signal from the base station to the UE.

[0355] As another example, the base station can configure a reference value to the UE through a higher layer (e.g., RRC) signal. According to the reference value consisting of the RRC signal, the PRB index where the broadcast channel starts in the active DL BWP can be determined as RB start = RB start_temp + reference.

[0356] As another example, the base station can configure the UE with a CRB index CRB reference for deriving a reference value through a higher layer (e.g., RRC) signal. The CRB reference is an absolute PRB index in which a PDSCH for transmitting a broadcast channel can be located. Accordingly, a PRB index in which a broadcast channel starts in an active DL BWP can be determined as RB start = RB start_temp + reference = RB start_temp + CRB reference - CRB active . If the active DL BWP does not include a PRB configured with the CRB index CRB reference , or the active DL BWP does not include PRBs from CRB reference to a certain length, the UE can obtain a PRB through which a broadcast channel is transmitted, according to a PRB in which a CORESET scheduling the broadcast channel is located. That is, the reference can be determined as a difference between CRB CORESET , the lowest common RB index of the CORESET scheduling the broadcast channel and CRB active , the lowest common RB index of the active DL BWP. That is, reference = CRB CORESET - CRB active . Accordingly, a PRB index in which a broadcast channel starts in an active DL BWP can be determined as RB start = RB start_temp + reference = RB start_temp + CRB CORESET - CRB active .

[0357] Figure 20 A signal transmission according to an embodiment of the present application is illustrated. Referring to Figure 20 , the communication device can check a set of RBs corresponding to resource allocation information in a frequency resource allocation region of an active BWP (S2002). For example, the communication device can index RBs based on a starting point of the frequency resource allocation region, and then check a set of RBs corresponding to the resource allocation information (e.g., bitmap, RIV). Here, when a condition is satisfied, the resource allocation region can follow an initial BWP. Accordingly, when the condition is satisfied, the resource allocation information corresponds to a set of RBs in the initial BWP. Here, the condition can include (1) the active DL BWP completely includes the initial DL BWP and (2) the active BWP and the initial BWP have the same subcarrier spacing. Thereafter, the communication device can transmit a radio signal in the set of RBs corresponding to the resource allocation information.

[0358] Figure 21is a block diagram illustrating a configuration of a UE and a base station according to an embodiment of the disclosure. In an embodiment of the disclosure, the UE can be implemented with various types of wireless communication devices or computing devices that are guaranteed to be portable and mobile. The UE can be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), etc. Also, in an embodiment of the disclosure, the base station controls and manages a cell (e.g., a macro cell, a femto cell, a pico cell, etc.) corresponding to a service area, and performs functions of signal transmission, channel designation, channel monitoring, self-diagnosis, relaying, etc. The base station can be referred to as a next-generation node B (gNB) or an access point (AP).

[0359] As illustrated in the drawings, the UE 100 according to an embodiment of the disclosure can include a processor 110, a communication module 120, a memory 130, a user interface 140, and a display unit 150.

[0360] First, the processor 110 can execute various instructions or processes within the UE 100 and process data. Also, the processor 110 can control the entire operation of each unit including the UE 100, and can control transmission / reception of data between the units. Here, the processor 110 can be configured to perform operations according to the embodiments described in the disclosure. For example, the processor 110 can receive slot configuration information, determine a slot configuration based on the slot configuration information, and perform communication according to the determined slot configuration.

[0361] Next, the communication module 120 can be an integrated module that performs wireless communication using a wireless communication network and performs wireless LAN access using a wireless LAN. To this end, the communication module 120 can include a plurality of network interface cards (NICs), such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, in an internal or external form. In the drawings, the communication module 120 is illustrated as an integrated module as a whole, but each network interface card can be independently arranged according to a circuit configuration or usage, unlike the drawings.

[0362] The cellular communication interface card 121 can transmit or receive radio signals with at least one of the base station 200, an external device, and a server by using a mobile communication network and provide a cellular communication service in a first frequency band based on an instruction from the processor 110. According to an embodiment, the cellular communication interface card 121 can include at least one NIC module using a frequency band less than 6 GHz. The at least one NIC module of the cellular communication interface card 121 can independently perform cellular communication with at least one of the base station 200, the external device, and the server in accordance with a cellular communication standard or protocol in a sub-6 GHz band supported by the corresponding NIC module.

[0363] The cellular communication interface card 122 can transmit or receive a radio signal with at least one of the base station 200, the external device, and the server by using a mobile communication network and provide a cellular communication service in a second frequency band based on an instruction from the processor 110. According to an embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band greater than 6 GHz. The at least one NIC module of the cellular communication interface card 122 can independently perform cellular communication with at least one of the base station 200, the external device, and the server in a frequency band above 6 GHz supported by the corresponding NIC module in accordance with a cellular communication standard or protocol.

[0364] The unlicensed band communication interface card 123 transmits or receives a radio signal with at least one of the base station 200, the external device, and the server by using a third frequency band that is an unlicensed band and provides an unlicensed band communication service based on an instruction from the processor 110. The unlicensed band communication interface card 123 can include at least one NIC module using an unlicensed band. For example, the unlicensed band can be a 2.4 GHz or 5 GHz frequency band. The at least one NIC module of the unlicensed band communication interface card 123 can independently or dependently perform wireless communication with at least one of the base station 200, the external device, and the server in accordance with an unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0365] Next, the memory 130 stores a control program used in the UE 100 and various data thereof. Such a control program can include a prescribed program required to perform wireless communication with at least one of the base station 200, the external device, and the server.

[0366] Next, the user interface 140 includes various input / output means provided in the UE 100. In other words, the user interface 140 can receive a user input using various input means, and the processor 110 can control the UE 100 based on the received user input. Furthermore, the user interface 140 can perform output based on an instruction from the processor 110 using various output means.

[0367] Next, the display unit 150 outputs various images on a display screen. The display unit 150 can output various display objects such as content or a user interface executed by the processor 110 based on a control instruction from the processor 110.

[0368] Furthermore, the base station 200 according to an embodiment of the disclosure can include a processor 210, a communication module 220, and a memory 230.

[0369] First, the processor 210 can execute various instructions or programs and process internal data of the base station 200. Also, the processor 210 can control the overall operation of each unit in the base station 200 and control the transmission and reception of data between the units. Here, the processor 210 can be configured to perform operations according to the embodiments described in the disclosure. For example, the processor 210 can signal a slot configuration and perform communication according to the signaled slot configuration.

[0370] Next, the communication module 220 can be an integrated module that performs wireless communication using a wireless communication network and performs wireless LAN access using a wireless LAN. To this end, the communication module 120 can include a plurality of network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, in an internal or external form. In the drawing, the communication module 220 is shown as an integrated module as a whole, but unlike the drawing, each network interface card can be independently arranged according to a circuit configuration or usage.

[0371] The cellular communication interface card 221 can transmit or receive radio signals with at least one of the base station 100, an external device, and a server by using a mobile communication network and provide a cellular communication service in a first frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 221 can include at least one NIC module that uses a frequency band less than 6 GHz. The at least one NIC module of the cellular communication interface card 221 can independently perform cellular communication with at least one of the base station 100, the external device, and the server in the frequency band less than 6 GHz supported by the corresponding NIC module in accordance with a cellular communication standard or protocol.

[0372] The cellular communication interface card 222 can transmit or receive radio signals with at least one of the base station 100, an external device, and a server by using a mobile communication network and provide a cellular communication service in a second frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 222 can include at least one NIC module that uses a frequency band of 6 GHz or more. The at least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the base station 100, the external device, and the server in the frequency band of 6 GHz or more supported by the corresponding NIC module in accordance with a cellular communication standard or protocol.

[0373] The unlicensed band communication interface card 223 transmits or receives a radio signal with at least one of the base station 100, the external device, and the server by using a third band that is an unlicensed band, and provides an unlicensed band communication service based on an instruction from the processor 210. The unlicensed band communication interface card 223 can include at least one NIC module that uses an unlicensed band. For example, the unlicensed band can be a 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 223 can independently or dependently perform wireless communication with at least one of the base station 100, the external device, and the server in accordance with an unlicensed band communication standard or protocol of a band supported by the corresponding NIC module.

[0374] Figure 21 is a block diagram illustrating a UE 100 and a base station 200 according to an embodiment of the disclosure, and the separately illustrated blocks are logically divided elements of the devices. Accordingly, the aforementioned elements of the devices can be mounted in a single chip or a plurality of chips according to the design of the devices. Also, a part of the configuration of the UE 100, for example, the user interface 140, the display unit 150, etc., can be selectively provided in the UE 100. Also, the user interface 140, the display unit 150, etc. can be additionally provided in the base station 200 if necessary.

[0375] The foregoing description of the disclosure has been presented for the purposes of illustration and description. It is apparent to a person having ordinary skill in the art related to the disclosure that the disclosure can be readily modified in other detailed forms without changing the technical principles or essential features of the disclosure. Therefore, the embodiments described above are presented by way of illustration and example only, and should not limit the disclosure. For example, each component described as a single type can be implemented in a distributed manner. Likewise, components described as distributed can be implemented in a combined manner.

[0376] The scope of the disclosure is presented by the following claims rather than the foregoing description. It should be understood that all changes or modifications derived from the definition and scope of the claims and their equivalents fall within the scope of the disclosure.

Claims

1. A user equipment (UE) configured to operate in a third generation partnership project (3GPP) -based wireless communication system having a plurality of bandwidth parts (BWPs) in a cell, the UE comprising: a processor; and a communication module, wherein the processor is configured to: transmit a physical uplink control channel (PUCCH) including hybrid automatic repeat request-acknowledgement (HARQ-ACK) information for the PDSCH, receive scheduling information for a physical downlink shared channel, PDSCH, wherein the scheduling information includes a size, N, of a first BWP expressed as a number of resource blocks, RBs BWP1 a defined resource indication value, RIV; and receiving the PDSCH on contiguous frequency resources of a second BWP, wherein the second BWP has a size N expressed as a number of RBs BWP2 and a starting index S and a length L of the contiguous frequency resources are associated with the RIV; and wherein S and L are expressed in units of RBs. wherein, when N BWP2 > N BWP1 the starting index S and the length L of the contiguous frequency resources are defined as follows: - S: elements of the set {0, K, 2*K,..., (N BWP1 -1)*K}, and - L: {K, 2*K, 3*K,..., N BWP1 elements of {K, 2*K, 3*K,..., N wherein, based on (N BWP2 / N BWP1 ), K has a value in the set {1,2,…,2 n-1 ,2 n} and n represents a positive integer, and wherein, based on (N BWP2 / N BWP1 ), K has a value in the set {1,2,…,2 n-1 ,2 n} and both the first BWP and the second BWP belong to the cell, and a relationship between the first BWP and the second BWP includes:

2. The UE of claim 1, wherein, - first BWP, second BWP = initial BWP, active BWP, or - first BWP, second BWP = currently activated BWP, newly activated BWP, wherein the currently activated BWP is an active BWP at a time of receiving the scheduling information, and the newly activated BWP is a BWP indicated by a bandwidth part indicator (BPI) in the scheduling information. - for 1 < X < 2, K = 1, 3. The UE of claim 1, wherein, K and (N BWP2 / N BWP1 ) satisfy a relationship comprising at least a portion of: - for 2 ≤ X < 4, K = 2, - for 4 ≤ X < 8, K = 4, - for 8 ≤ X < 16, K = 8, the RIV has a value satisfying the following equation: wherein X is (N BWP2 / N BWP1 ).

4. The UE of claim 1, wherein, wherein floor denotes a floor function. - if (L' - 1) < floor(N BWP1 / 2), then RIV = N BWP1 *(L' - 1) + S', and - if (L' - 1) > floor(N BWP1 / 2), then RIV = N BWP1 *(N BWP1 - L' + 1) + (N BWP1 - 1 - S'), where L' is 1 < L' < N as L / K BWP1 the value of S', and S' is S / K, and 6.A base station (BS) configured to operate in a third generation partnership project (3GPP) -based wireless communication system having a plurality of bandwidth parts (BWPs) in a cell, the BS comprising:

5. The UE of claim 1, wherein, When N BWP2 ≤ N BWP1 , the starting index S and length L of the contiguous frequency resources are defined within the second BWP as follows: - S: {0, 1, 2,..., N BWP2 -1} and - L: {1, 2, 3,..., N BWP2} elements. a processor; and a communication module, wherein the processor is configured to: receive a physical uplink control channel (PUCCH) including hybrid automatic repeat request-acknowledgement (HARQ-ACK) information for the PDSCH, wherein S and L are expressed in units of RBs. transmit scheduling information for a physical downlink shared channel (PDSCH), wherein the scheduling information includes a size N of a first BWP expressed as a number of resource blocks (RBs) BWP1 a defined resource indication value (RIV); and transmitting the PDSCH on contiguous frequency resources of a second BWP, wherein the second BWP has a size N expressed as a number of RBs BWP2 and a starting index S and a length L of the contiguous frequency resources are associated with the RIV; and both the first BWP and the second BWP belong to the cell, and a relationship between the first BWP and the second BWP includes: wherein, when N BWP2 > N BWP1 the starting index S and the length L of the contiguous frequency resources are defined as follows: - S: elements of the set {0, K, 2*K,..., (N BWP1 -1)*K}, and - L: {K, 2*K, 3*K,..., N BWP1 elements of {K, 2*K, 3*K,..., N wherein, based on (N BWP2 / N BWP1 ), K has a value in the set {1,2,..., 2 n-1 ,2 n} and n represents a positive integer, and wherein, based on (N BWP2 / N BWP1 ), K has a value in the set {1,2,..., 2 n-1 ,2 n - first BWP, second BWP = initial BWP, active BWP, or 7. The BS of claim 6, wherein, - first BWP, second BWP = currently activated BWP, newly activated BWP, wherein the currently activated BWP is an active BWP at a time of transmitting the scheduling information, and the newly activated BWP is a BWP indicated by a bandwidth part indicator (BPI) in the scheduling information. - for 1 < X < 2, K = 1, - for 2 ≤ X < 4, K = 2, 8. The BS of claim 6, wherein, K and (N BWP2 / N BWP1 ) have a relationship comprising at least a portion of: - for 4 ≤ X < 8, K = 4, - for 8 ≤ X < 16, K = 8, the RIV has a value satisfying the following equation: wherein floor denotes a floor function. wherein X is (N BWP2 / N BWP1 ).

9. The BS of claim 6, wherein, 11.A method performed by a user equipment (UE) in a third generation partnership project (3GPP) -based wireless communication system having a plurality of bandwidth parts (BWPs) in a cell, the method comprising: - if (L' - 1) < floor(N BWP1 / 2), then RIV = N BWP1 *(L' - 1) + S', and - if (L' - 1) > floor(N BWP1 / 2), then RIV = N BWP1 *(N BWP1 - L' + 1) + (N BWP1 - 1 - S'), where L' is 1 < L' < N as L / K BWP1 the value of S', and S' is S / K, and transmitting a physical uplink control channel (PUCCH) including hybrid automatic repeat request-acknowledgement (HARQ-ACK) information for the PDSCH, 10. The BS of claim 6, wherein, When N BWP2 ≤ N BWP1 , the starting index S and the length L of the contiguous frequency resources are defined within the second BWP as follows: - S: {0, 1, 2,..., N BWP2 -1} and - L: elements of {1, 2, 3,..., N BWP2}. wherein S and L are expressed in units of RBs. receiving scheduling information for a physical downlink shared channel, PDSCH, wherein the scheduling information includes a size, N, of a first BWP expressed as a number of resource blocks, RBs BWP1 a defined resource indication value, RIV; and receiving the PDSCH on contiguous frequency resources of a second BWP, wherein the second BWP has a size N expressed as a number of RBs BWP2 and a starting index S and a length L of the contiguous frequency resources are associated with the RIV; and ​ wherein, when N BWP2 > N BWP1 the starting index S and the length L of the contiguous frequency resources are defined as follows: - S: elements of the set {0, K, 2*K,..., (N BWP1 -1)*K}, and - L: {K, 2*K, 3*K,..., N BWP1 elements of {K, 2*K, 3*K,..., N wherein, based on (N BWP2 / N BWP1 ), K has a value in the set {1,2,..., 2 n-1 ,2 n} and n represents a positive integer, and wherein, based on (N BWP2 / N BWP1 ), K has a value in the set {1,2,..., 2 n-1 ,2 n ​ 12. The method of claim 11, wherein, The first BWP and the second BWP both belong to the cell, and the relationship between the first BWP and the second BWP comprises: - first BWP, second BWP = initial BWP, active BWP, or - first BWP, second BWP = currently activated BWP, newly activated BWP, wherein the currently activated BWP is an active BWP at a time of receiving the scheduling information, and the newly activated BWP is a BWP indicated by a bandwidth part indicator BPI in the scheduling information.

13. The method of claim 11, wherein, K and (N BWP2 / N BWP1 ) satisfy a relationship comprising at least a portion of: - for 1 < X < 2, K = 1, - for 2≤X<4, K = 2, - for 4≤X<8, K = 4, - for 8≤X<16, K = 8, wherein X is (N BWP2 / N BWP1 ).

14. The method of claim 11, wherein, The RIV has a value satisfying the following equation: - if (L' - 1) < floor(N BWP1 / 2), then RIV = N BWP1 *(L' - 1) + S', and - if (L' - 1) > floor(N BWP1 / 2), then RIV = N BWP1 *(N BWP1 - L' + 1) + (N BWP1 - 1 - S'), where L' is 1 < L' < N as L / K BWP1 the value of S', and S' is S / K, and wherein floor represents a down rounding function.

15. The method of claim 11, wherein, When N BWP2 ≤ N BWP1 , the starting index S and length L of the contiguous frequency resources are defined within the second BWP as follows: - S: {0, 1, 2,..., N BWP2 -1} and - L: elements of {1, 2, 3,..., N BWP2}.

16. A method performed by a base station BS in a third generation partnership project, 3GPP, based wireless communication system having a plurality of bandwidth parts, BWPs, in a cell, the method comprising: transmit scheduling information for a physical downlink shared channel (PDSCH), wherein the scheduling information includes a size N of a first BWP expressed as a number of resource blocks (RBs) BWP1 a defined resource indication value (RIV); and transmitting the PDSCH on contiguous frequency resources of a second BWP, wherein the second BWP has a size N expressed as a number of RBs BWP2 and a starting index S and a length L of the contiguous frequency resources are associated with the RIV; and receiving a physical uplink control channel, PUCCH, including hybrid automatic repeat request acknowledgement, HARQ-ACK, information for the PDSCH, wherein, when N BWP2 > N BWP1 the starting index S and the length L of the contiguous frequency resources are defined as follows: - S: elements of the set {0, K, 2*K,..., (N BWP1 -1)*K}, and - L: {K, 2*K, 3*K,..., N BWP1 elements of {K, 2*K, 3*K,..., N wherein, based on (N BWP2 / N BWP1 ), K has a value in the set {1,2,..., 2 n-1 ,2 n} and n represents a positive integer, and wherein S and L are expressed in units of RBs.

17. The method of claim 16, wherein, The first BWP and the second BWP both belong to the cell, and the relationship between the first BWP and the second BWP comprises: - first BWP, second BWP = initial BWP, active BWP, or - first BWP, second BWP = currently activated BWP, newly activated BWP, wherein the currently activated BWP is an active BWP at a time of receiving the scheduling information, and the newly activated BWP is a BWP indicated by a bandwidth part indicator BPI in the scheduling information.

18. The method of claim 16, wherein, K and (N BWP2 / N BWP1 ) satisfy a relationship comprising at least a portion of: - for 1 < X < 2, K = 1, - for 2≤X<4, K = 2, - for 4≤X<8, K = 4, - for 8≤X<16, K = 8, wherein X is (N BWP2 / N BWP1 ).

19. The method of claim 16, wherein, The RIV has a value satisfying the following equation: - if (L' - 1) < floor(N BWP1 / 2), then RIV = N BWP1 *(L' - 1) + S', and - if (L' - 1) > floor(N BWP1 / 2), then RIV = N BWP1 *(N BWP1 - L' + 1) + (N BWP1 - 1 - S'), where L' is 1 < L' < N as L / K BWP1 the value of S' and S' is S / K, and wherein floor represents a down rounding function.

20. The method of claim 16, wherein, When N BWP2 ≤ N BWP1 , the starting index S and the length L of the contiguous frequency resources are defined within the second BWP as follows: - S: {0, 1, 2,..., N BWP2 -1} and - L: an element of {1, 2, 3,..., N BWP2}.

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