Method for transmitting and receiving signals in a wireless communication system and apparatus therefor

Abstract

The present invention relates to a method for efficiently sending and receiving a group wake-up signal (WUS) in a wireless communication system and a device therefor, and more particularly, to a method and a device therefor, comprising the steps of: acquiring a WUS sequence associated with a WUS resource for a communication device among a first WUS resource or a second WUS resource for a group WUS, wherein the first WUS resource is configured to include WUS resources available to a communication device that does not support the group WUS, and the second WUS resource is configured to be temporally connected before the first WUS resource; and attempting to detect a group WUS in the WUS resource for the communication device based on the acquired WUS sequence, wherein the WUS sequence associated with the WUS resource for the communication device is a WUS sequence given based on a scrambling sequence generated based on an initialization value determined based on resource identification information of the WUS resource for the communication device, the resource identification information of the WUS resource for the communication device having a value of 0 based on the WUS resource for the communication device being the first WUS resource, and the resource identification information of the WUS resource for the communication device having a value of 1 based on the WUS resource for the communication device being the second WUS resource.

Description

Technical Field

[0001] The present disclosure relates to methods and apparatus for use in wireless communication systems. Background Art

[0002] Wireless communication systems have been widely developed to provide a variety of communication services, including audio and data communications. Generally, a wireless communication system is a multiple-access system capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). For example, multiple-access systems include CDMA (Code Division Multiple Access) systems, FDMA (Frequency Division Multiple Access) systems, TDMA (Time Division Multiple Access) systems, OFDMA (Orthogonal Frequency Division Multiple Access) systems, and SC-FDMA (Single Carrier Frequency Division Multiple Access) systems. Summary of the Invention

[0003] Technical issues

[0004] An object of the present disclosure is to provide a method of efficiently transmitting and receiving a wake-up signal and a device therefor.

[0005] Another object of the present disclosure is to provide a method for efficiently generating / obtaining a sequence of wake-up signals and a device therefor.

[0006] Those skilled in the art will appreciate that the objectives that can be achieved using the present disclosure are not limited to the objectives that have been specifically described above, and the above objectives and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0007] Technical Solutions

[0008] According to a first aspect of the present disclosure, a method performed by a communication device supporting a group wake-up signal (WUS) in a wireless communication system is provided. The method may include the following steps: obtaining a WUS sequence associated with a WUS resource for the communication device, among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include WUS resources available to communication devices that do not support the group WUS, and wherein the second WUS resource may be configured to be immediately prior to the first WUS resource in time; and attempting to detect the group WUS on the WUS resource for the communication device based on the obtained WUS sequence. The WUS sequence associated with the WUS resource for the communication device may be given based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the communication device. Based on the WUS resource for the communication device being the first WUS resource, the resource identification information for the WUS resource for the communication device may have a value of 0. Based on the WUS resource for the communication device being the second WUS resource, the resource identification information for the WUS resource for the communication device may have a value of 1.

[0009] According to a second aspect of the present disclosure, a communication device supporting a group WUS in a wireless communication system is provided. The communication device may include: at least one processor; at least one radio frequency (RF) transceiver; and at least one memory, the at least one memory including instructions configured to implement operations by controlling the at least one RF transceiver when executed by the at least one processor. The operations may include the following steps: obtaining a WUS sequence associated with a WUS resource for the communication device among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include a WUS resource available to a communication device that does not support the group WUS, and wherein the second WUS resource may be configured to be immediately before the first WUS resource in time; and attempting to detect the group WUS on the WUS resource for the communication device based on the obtained WUS sequence. The WUS sequence associated with the WUS resource for the communication device may be given based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the communication device. Based on the WUS resource for the communication device being the first WUS resource, the resource identification information of the WUS resource for the communication device may have a value of 0. Based on the WUS resource for the communication device being the second WUS resource, the resource identification information of the WUS resource for the communication device has a value of 1.

[0010] According to a third aspect of the present disclosure, an apparatus for a communication device supporting a group WUS in a wireless communication system is provided. The apparatus may include: at least one processor; and at least one memory, the at least one memory including a memory configured to implement operations when executed by the at least one processor. The operations may include the following steps: obtaining a WUS sequence associated with a WUS resource for the communication device, among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include a WUS resource available to communication devices that do not support the group WUS, and wherein the second WUS resource may be configured to be immediately prior to the first WUS resource in terms of time; and attempting to detect the group WUS on the WUS resource for the communication device based on the obtained WUS sequence. The WUS sequence associated with the WUS resource for the communication device may be provided based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the communication device. Based on the WUS resource for the communication device being the first WUS resource, the resource identification information of the WUS resource for the communication device may have a value of 0. The resource identification information of the WUS resource for the communication device has a value of 1 based on that the WUS resource for the communication device is the second WUS resource.

[0011] According to a fourth aspect of the present disclosure, a computer-readable storage medium including instructions is provided, the instructions being configured to, when executed by a processor, implement operations related to a group WUS. The operations may include the following steps: obtaining a WUS sequence associated with a WUS resource for the communication device, among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include WUS resources available to communication devices that do not support the group WUS, and wherein the second WUS resource may be configured to be immediately prior to the first WUS resource in time; and attempting to detect the group WUS on the WUS resource for the communication device based on the obtained WUS sequence. The WUS sequence associated with the WUS resource for the communication device may be provided based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the communication device. Based on the WUS resource for the communication device being the first WUS resource, the resource identification information of the WUS resource for the communication device may have a value of 0. The resource identification information of the WUS resource for the communication device has a value of 1 based on that the WUS resource for the communication device is the second WUS resource.

[0012] Preferably, the initialization value can be determined based on the following formula:

[0013]

[0014] In the above formula, c init_WUS Can represent the initialization value, c g The resource identification information of the WUS resource for the communication device may be represented, may represent cell identification information about a cell used for the communication device, n f_start_PO may represent the initial frame of the initial paging occasion associated with the group WUS, n s_start_PO may represent an initial time slot of the initial paging occasion associated with the group WUS, can represent a floor operation, and mod can represent a modulo operation.

[0015] Additionally or alternatively, the method or the operations may further include monitoring a control channel for paging in a paging occasion associated with the group of WUSs based on the detection of the group of WUSs.

[0016] Additionally or alternatively, the method or the operations may further include skipping monitoring of a control channel for paging in a paging occasion related to the group of WUSs based on failure to detect the group of WUSs.

[0017] Additionally or alternatively, the first WUS resource and the second WUS resource may be associated with the same paging occasion.

[0018] Additionally or alternatively, the group WUS may refer to a WUS identifiable for each of a plurality of device groups consisting of devices configured to monitor the same paging occasion.

[0019] According to a fifth aspect of the present disclosure, a method for transmitting a signal by a base station supporting a group WUS in a wireless communication system is provided. The method may include the following steps: obtaining a WUS sequence associated with a WUS resource for a specific user equipment (UE) among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include a WUS resource available to a UE that does not support the group WUS, and wherein the second WUS resource may be configured to be immediately before the first WUS resource in time; and based on the obtained WUS sequence, transmitting the group WUS to the specific UE on the WUS resource for the specific UE. The WUS sequence associated with the WUS resource for the specific UE may be given based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the specific UE. Based on the WUS resource for the specific UE being the first WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 0. Based on the fact that the WUS resource for the specific UE is the second WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 1.

[0020] According to a sixth aspect of the present disclosure, a base station supporting a group WUS in a wireless communication system is provided. The base station may include: at least one processor; at least one RF transceiver; and at least one memory, the at least one memory including instructions configured to implement operations by controlling the at least one RF transceiver when executed by the at least one processor. The operations may include the following steps: obtaining a WUS sequence associated with a WUS resource for a specific user equipment (UE) among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include a WUS resource available to a UE that does not support the group WUS, and wherein the second WUS resource may be configured to be immediately before the first WUS resource in time; and based on the obtained WUS sequence, transmitting the group WUS to the specific UE on the WUS resource for the specific UE. The WUS sequence associated with the WUS resource for the specific UE may be given based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the specific UE. Based on the WUS resource for the specific UE being the first WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 0. Based on the WUS resource for the specific UE being the second WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 1.

[0021] According to a seventh aspect of the present disclosure, an apparatus for a base station supporting a group WUS in a wireless communication system is provided. The apparatus may include: at least one processor; and at least one memory, the at least one memory including a memory configured to implement an operation when executed by the at least one processor. The operation may include the following steps: obtaining a WUS sequence associated with a WUS resource for a specific user equipment (UE) among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include a WUS resource available to a UE that does not support the group WUS, and wherein the second WUS resource may be configured to be immediately before the first WUS resource in time; and based on the obtained WUS sequence, transmitting the group WUS to the specific UE on the WUS resource for the specific UE. The WUS sequence associated with the WUS resource for the specific UE may be given based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the specific UE. Based on the WUS resource for the specific UE being the first WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 0. Based on the fact that the WUS resource for the specific UE is the second WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 1.

[0022] According to an eighth aspect of the present disclosure, a computer-readable storage medium including instructions is provided, wherein the instructions are configured to implement operations related to a group WUS when executed by a processor. The operations may include the following steps: obtaining a WUS sequence related to a WUS resource for a specific user equipment (UE) among a first WUS resource for the group WUS and a second WUS resource for the group WUS, wherein the first WUS resource may be configured to include a WUS resource available to a UE that does not support the group WUS, and wherein the second WUS resource may be configured to be immediately before the first WUS resource in time; and based on the obtained WUS sequence, sending the group WUS to the specific UE on the WUS resource for the specific UE. The WUS sequence related to the WUS resource for the specific UE may be given based on a scrambling sequence generated using an initialization value determined based on resource identification information of the WUS resource for the specific UE. Based on the fact that the WUS resource for the specific UE is the first WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 0. Based on the fact that the WUS resource for the specific UE is the second WUS resource, the resource identification information of the WUS resource for the specific UE may have a value of 1.

[0023] Preferably, the initialization value can be determined based on the following formula:

[0024]

[0025] In the above formula, c init_WUS Can represent the initialization value, c g The resource identification information of the WUS resource for the specific UE may be represented, It can represent the cell identification information about the cell used for the specific UE, n f_start_PO may represent the initial frame of the initial paging occasion associated with the group WUS, n s_start_PO may represent an initial time slot of the initial paging occasion associated with the group WUS, can represent a floor operation, and mod can represent a modulo operation.

[0026] Additionally or alternatively, the method or the operation may further include: sending a control channel for paging to the specific UE at a paging occasion related to the group WUS.

[0027] Additionally or alternatively, the first WUS resource and the second WUS resource may be associated with the same paging occasion.

[0028] Additionally or alternatively, the group WUS may refer to a WUS identifiable for each of a plurality of UE groups consisting of UEs configured to monitor the same paging occasion.

[0029] Beneficial effects

[0030] According to the present disclosure, a wake-up signal can be efficiently transmitted and received.

[0031] In addition, according to the present disclosure, a sequence of wake-up signals can be efficiently generated / obtained.

[0032] Those skilled in the art will appreciate that the effects that can be achieved with the present disclosure are not limited to the effects that have been specifically described above, and other advantages of the present disclosure will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the principle of the disclosure.

[0034] Figure 1 Illustrated are physical channels and general signaling used in a 3rd Generation Partnership Project (3GPP) system.

[0035] Figure 2A Long Term Evolution (LTE) radio frame structure is illustrated.

[0036] Figure 3 The structure of the time slot of the LTE frame is illustrated.

[0037] Figure 4 The structure of a downlink subframe in the LTE system is illustrated.

[0038] Figure 5 The structure of a radio frame used in a New Radio (NR) system is illustrated.

[0039] Figure 6 The structure of the time slot of the NR frame is illustrated.

[0040] Figure 7 The signal frequency band of MTC is illustrated as an example.

[0041] Figure 8 Scheduling in conventional LTE and MTC is illustrated.

[0042] Figure 9 The transmission of the Narrowband Internet of Things (NB-IoT) downlink physical channel / signal is illustrated.

[0043] Figure 10 The timing relationship between the wake-up signal (WUS) and the paging occasion (PO) is illustrated.

[0044] Figures 11 to 17 An example of transmitting and receiving a user equipment (UE) group WUS according to the method proposed in the present disclosure is illustrated.

[0045] Figure 18 and Figure 19 The flowchart illustrates the base station (BS) operation and the UE operation to which the method proposed in the present disclosure is applied.

[0046] Figures 20 to 24 The present invention exemplifies a system and a communication device to which the method proposed in the present disclosure is applicable. DETAILED DESCRIPTION

[0047] In the following description, downlink (DL) refers to communication from a base station (BS) to a user equipment (UE), and uplink (UL) refers to communication from a UE to a BS. In the case of DL, the transmitter can be part of the BS and the receiver can be part of the UE. In the case of UL, the transmitter can be part of the UE and the receiver can be part of the BS.

[0048] The technology described herein is applicable to 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 frequency division multiple access (SC-FDMA), etc. CDMA can be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as a radio technology such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA. LTE-Advanced (LTE-A) or LTE-A pro is an evolved version of 3GPP LTE. 3GPP New Radio or New Radio Access Technology (3GPP NR) or 5G is an evolved version of 3GPP LTE, LTE-A or LTE-A pro.

[0049] Although the present disclosure is described based on 3GPP communication systems (e.g., LTE-A, NR, etc.) for clarity of description, the spirit of the present disclosure is not limited thereto. LTE refers to a technology that goes beyond 3GPP Technical Specification (TS) 36.xxx Version 8. In particular, LTE technology that goes beyond 3GPP TS 36.xxx Version 10 is called LTE-A, and LTE technology that goes beyond 3GPP TS 36.xxx Version 13 is called LTE-A pro. 3GPP 5G means technology that goes beyond TS 36.xxx Version 15, and 3GPP NR means technology that goes beyond 3GPP TS 38.xxx Version 15. LTE / NR may be referred to as a "3GPP system." Here, "xxx" refers to a standard specification number. LTE / NR may generally be referred to as a "3GPP system." Details of the background, terminology, abbreviations, etc. used herein may be found in documents published prior to the present disclosure. For example, reference may be made to the following documents.

[0050] 3GPP LTE

[0051] -36.211: Physical channels and modulation

[0052] -36.212: Multiplexing and Channel Coding

[0053] -36.213: Physical layer procedures

[0054] -36.300: General description

[0055] -36.304: User Equipment (UE) procedures in idle mode

[0056] -36.331: Radio Resource Control (RRC)

[0057] 3GPP NR

[0058] -38.211: Physical channels and modulation

[0059] -38.212: Multiplexing and channel coding

[0060] -38.213: Physical layer procedures for control

[0061] -38.214: Physical layer processing of data

[0062] -38.300: NR and NG-RAN general description

[0063] -38.304: User Equipment (UE) procedures in idle mode and RRC inactive state

[0064] -36.331: Radio Resource Control (RRC) Protocol Specification

[0065] Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), LTE, LTE-A, LTE-A pro, and 5th Generation (5G) systems may be collectively referred to as LTE systems. Next Generation Radio Access Network (NG-RAN) may be referred to as NR systems. UE may be fixed or mobile. The term UE may be used interchangeably with other terms such as terminal, mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), and wireless device. A BS is typically a fixed station that communicates with a UE. The term BS may be used interchangeably with other terms such as evolved Node B (eNB), generalized Node B (gNB), base transceiver system (BTS), and access point (AP).

[0066] A. Physical Channel and Frame Structure

[0067] Physical channels and general signaling

[0068] Figure 1 This diagram illustrates the physical channels and general signal transmission process in a 3GPP system. In a wireless communication system, a UE receives information from a base station (BS) on the downlink (DL) and transmits information to the BS on the uplink (UL). Information transmitted and received between the UE and BS includes data and various types of control information. Various physical channels exist depending on the type and purpose of the information transmitted and received between the BS and UE.

[0069] When a UE is powered on or enters a new cell, it performs an initial cell search, including acquiring synchronization with the base station (BS) (S11). For the initial cell search, the UE synchronizes its timing with the base station (BS) by receiving a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station and acquires information such as a cell identifier (ID). The UE can further acquire information broadcast in the cell by receiving a physical broadcast channel (PBCH) from the base station. During the initial cell search, the UE can further monitor the DL channel status by receiving a downlink reference signal (DLRS).

[0070] After the initial cell search, the UE may acquire more detailed system information by receiving a physical downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) corresponding to the PDCCH ( S12 ).

[0071] Subsequently, in order to complete the connection to the BS, the UE may perform a random access procedure with the BS (see Figure 2 and related descriptions) (S13 to S16). Specifically, the UE may transmit a random access preamble on a physical random access channel (PRACH) (S13) and may receive a PDCCH and a random access response (RAR) to the preamble on a PDSCH corresponding to the PDCCH (S14). The UE may then transmit a physical uplink shared channel (PUSCH) by using scheduling information included in the RAR (S15) and perform a contention resolution procedure including reception of the PDCCH and the PDSCH corresponding to the PDCCH (S16).

[0072] After the above process, the UE can receive PDCCH and / or PDSCH from the BS (S17) and send PUSCH and / or physical uplink control channel (PUCCH) to the BS during general UL / DL signal transmission (S18). The control information sent by the UE to the BS is collectively referred to as uplink control information (UCI). UCI includes hybrid automatic repeat and request acknowledgment / negative acknowledgment (HARQACK / NACK), scheduling request (SR) and channel state information (CSI). CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI), rank indication (RI), etc. Typically, UCI is sent on PUCCH. However, if control information and data should be sent at the same time, control information can be sent on PUSCH. In addition, upon receiving a request / command from the network, the UE can send UCI on PUSCH at irregular intervals.

[0073] Radio frame structure

[0074] Figure 2The figure shows the LTE radio frame structure. LTE supports frame type 1 for frequency division duplex (FDD), frame type 2 for time division duplex (TDD), and frame type 3 for unlicensed cells (UCell). In addition to the primary cell (PCell), up to 31 secondary cells (SCells) can be aggregated. Unless otherwise specified, the operations described in this disclosure can be applied independently based on the cell. In multi-cell aggregation, different cells can use different frame structures. In addition, the time resources (e.g., subframes, time slots, and sub-time slots) within the frame structure can be collectively referred to as time units (TUs).

[0075] Figure 2 (a) illustrates frame type 1. A DL radio frame is defined by 10 1-ms subframes (SFs). Depending on the cyclic prefix (CP), a subframe includes 14 or 12 symbols. In the case of a normal CP, a subframe includes 14 symbols, and in the case of an extended CP, a subframe includes 12 symbols. Depending on the multiple access scheme, a symbol may be an OFDM (A) symbol or an SC-FDM (A) symbol. For example, a symbol may refer to an OFDM (A) symbol on DL and an SC-FDM (A) symbol on UL. An OFDM (A) symbol may be referred to as a cyclic prefix-OFDM (A) (CP-OFDM (A)) symbol, and an SC-FDM (A) symbol may be referred to as a discrete Fourier transform-extended-OFDM (A) (DFT-s-OFDM (A)) symbol.

[0076] Figure 2 (b) illustrates frame type 2. Frame type 2 includes two half-frames. One half-frame includes four (or five) common subframes and one (or zero) special subframe. Depending on the UL-DL configuration, the common subframe is used for UL or DL. One subframe includes two time slots.

[0077] The above-described radio frame structure is merely exemplary, and the number of subframes in a radio frame, the number of slots in a subframe, and the number of symbols in a slot may vary.

[0078] Figure 3 The diagram shows the time slot structure in an LTE frame.

[0079] refer to Figure 3 , a slot includes multiple resource blocks (RBs) in the frequency domain and multiple symbols in the time domain. A symbol may refer to a symbol duration. The slot structure may be represented as including N DL / UL RB xN RB sc subcarriers and N DL / UL symb A resource grid of N symbols. DL RB represents the number of RBs in a DL slot, and NUL RB Indicates the number of RBs in the UL slot. DL RB and N UL RB Depends on the DL bandwidth and UL bandwidth respectively. DL symb represents the number of symbols in a DL slot, and N UL symb Indicates the number of symbols in the UL slot. RB sc Indicates the number of subcarriers in one RB. The number of symbols in a slot can vary depending on the subcarrier spacing (SCS) and CP length. For example, in the case of normal CP, one slot includes 7 symbols, while in the case of extended CP, one slot includes 6 symbols.

[0080] RB is defined as N in the time domain DL / UL symb (e.g., 7) consecutive symbols multiplied by N in the frequency domain RB SC (e.g., 12) consecutive subcarriers. An RB can be a physical resource block (PRB) or a virtual resource block (VRB), and a PRB can be mapped to a VRB in a one-to-one correspondence. Two RBs, each located in one of the two time slots of a subframe, can be referred to as an RB pair. The two RBs of an RB pair can have the same RB number (or RB index). A resource comprising one symbol multiplied by one subcarrier is called a resource element (RE) or a tone. Each RE of a resource grid can be uniquely identified by an index pair (k, l) in a time slot, where k is a value ranging from 0 to N. DL / UL RB xN RB sc -1 frequency domain index, and l ranges from 0 to N DL / UL symb A time domain index of -1.

[0081] Figure 4 FIG2 illustrates a downlink subframe in an LTE system.

[0082] refer to Figure 4, up to three (or four) OFDM (A) symbols at the beginning of the first time slot of the subframe correspond to the control region. The remaining OFDM (A) symbols correspond to the data region to which the PDSCH is allocated, and the basic resource unit of the data region is the RB. DL control channels include the Physical Control Format Indicator Channel (PCFICH), PDCCH, Physical Hybrid ARQ Indicator Channel (PHICH), etc. PCFICH is sent in the first OFDM symbol of the subframe and conveys information about the number of OFDM symbols used to transmit control channels in the subframe. PHICH is a response to UL transmission and transmits HARQ ACK / NACK signals. The control information transmitted on the PDCCH is called downlink control information (DCI). DCI includes UL resource allocation information, DL resource control information, or UL transmit power control commands for any UE group.

[0083] Figure 5 This figure illustrates the radio frame structure used in the NR system.

[0084] In NR, UL and DL transmissions are configured in frames. Each radio frame is 10 ms long and is divided into two 5 ms half frames (HF). Each half frame is divided into five 1 ms subframes. A subframe is divided into one or more slots, and the number of slots in a subframe depends on the SCS. Depending on the CP, each slot includes 12 or 14 OFDM (A) symbols. When a normal CP is used, each slot includes 14 OFDM symbols. When an extended CP is used, each slot includes 12 OFDM symbols. Symbols can include OFDM symbols (CP-OFDM symbols) and SC-FDMA symbols (or DFT-s-OFDM symbols).

[0085] Table 1 exemplarily illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the normal CP case.

[0086] [Table 1]

[0087]

[0088] *N slot symb : The number of symbols in a time slot

[0089] *N frame,u slot : The number of time slots in a frame

[0090] *N subframe,u slot : The number of time slots in a subframe

[0091] Table 2 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the case of extended CP.

[0092] [Table 2]

[0093]

[0094] In the NR system, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) can be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of time resources (e.g., subframes, time slots, or transmission time intervals (TTIs)) (referred to as TUs for convenience) including the same number of symbols can be configured differently for the aggregated cells.

[0095] Figure 6 The figure shows the time slot structure of the NR frame.

[0096] A slot includes multiple symbols in the time domain. For example, a slot includes 14 symbols in the normal CP case and 12 symbols in the extended CP case. A carrier includes multiple subcarriers in the frequency domain. An RB can be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) can be defined by multiple consecutive (P)RBs in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed in an active BWP, and only one BWP can be activated for a UE. Each element of the resource grid can be referred to as an RE, and a complex symbol can be mapped to the RE.

[0097] B. DL Channel

[0098] The BS transmits a relevant signal to the UE on a DL channel, and the UE receives a relevant signal from the BS on the DL channel.

[0099] (1) Physical Downlink Shared Channel (PDSCH)

[0100] PDSCH delivers DL data (e.g., DL shared channel transport block (DL-SCH TB)) and adopts modulation schemes such as quadrature phase shift keying (QPSK), 16-ary quadrature amplitude modulation (16QAM), 64-ary QAM (64QAM), or 256-ary QAM (256QAM). TB is encoded as a codeword. PDSCH can deliver up to two codewords. The codewords undergo scrambling and modulation mapping separately, and the modulation symbols from each codeword are mapped to one or more layers. An OFDM signal is generated by mapping each layer together with a demodulation reference signal (DMRS) to a resource and transmitted through the corresponding antenna port.

[0101] (2) Physical Downlink Control Channel (PDCCH)

[0102] PDCCH delivers DCI and adopts QPSK as the modulation scheme. One PDCCH includes 1, 2, 4, 8 or 16 control channel elements (CCE) depending on its aggregation level (AL). One CCE includes 6 resource element groups (REGs), each REG is defined by one OFDM symbol multiplied by one (P)RB. PDCCH is transmitted in a control resource set (CORESET). A CORESET is defined as a set of REGs with a given parameter set (e.g., SCS, CP length, etc.). Multiple CORESETs of a UE can overlap with each other in the time domain / frequency domain. CORESET can be configured by system information (e.g., Master Information Block (MIB)) or UE-specific higher layer signaling (e.g., RRC signaling). Specifically, the number of RBs and the number of symbols (up to 3) in a CORESET can be configured by higher layer signaling.

[0103] The UE acquires the DCI delivered on the PDCCH by decoding (so-called blind decoding) the PDCCH candidate set. The PDCCH candidate set decoded by the UE is defined as a PDCCH search space set. The search space set can be a common search space (CSS) or a UE-specific search space (USS). The UE can acquire DCI by monitoring PDCCH candidates in one or more search space sets configured by the MIB or higher layer signaling. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with one CORESET configuration. The search space set is determined based on the following parameters.

[0104] -controlResourceSetId: The control resource set associated with the search space set.

[0105] - monitoringSlotPeriodicityAndOffset: PDCCH monitoring period (in time slots) and PDCCH monitoring offset (in time slots).

[0106] - monitoringSymbolsWithinSlot: PDCCH monitoring pattern in the PDCCH monitoring slot (eg, the first symbol in CORESET).

[0107] -nrofCandidates: the number of PDCCH candidates per AL={1,2,4,8,16} (one of 0, 1, 2, 3, 4, 5, 6 and 8).

[0108] Table 3 lists exemplary features of each search space type.

[0109] [Table 3]

[0110]

[0111] C. Machine Type Communication (MTC)

[0112] MTC is a type of data communication involving one or more machines and can be applied to machine-to-machine (M2M) or the Internet of Things (IoT). A machine refers to an entity that does not require direct human manipulation or intervention. For example, machines include smart meters equipped with mobile communication modules, vending machines, portable terminals with MTC functions, etc. For example, services such as meter reading, water level measurement, use of surveillance cameras, and inventory reports for vending machines can be provided through MTC. MTC has the characteristics of a small amount of transmitted data and intermittent UL / DL data transmission / reception. Therefore, it is effective to reduce the unit cost of MTC devices and reduce battery consumption corresponding to low data rates. MTC devices generally have low mobility, and therefore MTC is performed in a channel environment that hardly changes.

[0113] 3GPP has applied MTC since Release 10, and MTC can be implemented to meet the requirements of low cost and low complexity, coverage enhancement and low power consumption. For example, 3GPP Release 12 adds features for low-cost MTC devices and therefore defines UE Category 0. The UE category is an indicator indicating the amount of data that the UE can process in the communication modem. UEs of UE Category 0 can reduce baseband / radio frequency (RF) complexity by using a reduced peak data rate, half-duplex operation with relaxed RF requirements, and a single receive (Rx) antenna. In 3GPP Release 12, enhanced MTC (eMTC) was introduced, and the price and power consumption of MTC UEs were further reduced by operating the MTC UEs only on 1.08 MHz (i.e., 6 RBs), the minimum frequency bandwidth supported by conventional LTE.

[0114] Herein, MTC may be used interchangeably with eMTC, LTE-M1 / M2, BL / CE (low complexity / coverage enhancement with reduced bandwidth), non-BL UE (in enhanced coverage), NR MTC (or reduced capability or RedCap), enhanced BL / CE, or other equivalent terms. Furthermore, MTC UE / device includes UE / device with MTC functionality (e.g., smart meters, vending machines, mobile UEs with MTC functionality).

[0115] The physical signals and channels used for MTC are similar to those in the reference above. Figure 1 The physical signals and channels described, and general signal transmission based on the physical signals and channels can be similar to the above reference Figure 1Although the PDCCH for MTC may be referred to as MTC PDCCH (MPDCCH), MPDCCH may also be collectively referred to as PDCCH.

[0116] Figure 7 The figure shows the MTC signal band.

[0117] refer to Figure 7 To reduce the unit cost of MTC UEs, MTC can be performed only in specific bands (or channel bands) of the cell system bandwidth (MTC subbands or narrowband (NB)), regardless of the cell system bandwidth. For example, an MTC UE can perform UL / DL operations only in the 1.08-MHz frequency band. 1.08 MHz corresponds to six consecutive PRBs in the LTE system and is defined to enable MTC UEs to follow the same cell search and random access procedures as LTE UEs. Figure 7 (a) illustrates an MTC subband configured at the center of the cell (eg, the center 6 PRBs), and Figure 7 (b) illustrates multiple MTC subbands configured within a cell. Multiple MTC subbands can be configured continuously / non-continuously in the frequency domain. Physical channels / signals for MTC can be sent and received in one MTC subband. In the NR system, the MTC subband can be defined in consideration of the frequency range and SCS. For example, in the NR system, the size of the MTC subband can be defined as X consecutive PRBs (i.e., 0.18*X*(2^μ) MHz bandwidth) (for μ, see Table 1). X can be set to 20 according to the size of the synchronization signal / physical broadcast channel (SS / PBCH) block. In the NR system, MTC can operate in at least one BWP. Multiple MTC subbands can be configured in one BWP.

[0118] Figure 8 The diagram illustrates scheduling in conventional LTE and MTC.

[0119] refer to Figure 8In legacy LTE, the PDSCH is scheduled by the PDCCH. Specifically, the PDCCH can be transmitted in the first N OFDM symbols of a subframe (N = 1 to 3), and the PDSCH scheduled by the PDCCH is transmitted in the same subframe. In MTC, the PDSCH is scheduled by the MPDCCH. Therefore, an MTC UE can monitor MPDCCH candidates in the search space within a subframe. Monitoring includes blind decoding of MPDCCH candidates. The MPDCCH carries DCI, which includes UL or DL ​​scheduling information. The MPDCCH is multiplexed with the PDSCH in FDM within a subframe. The MPDCCH is repeatedly transmitted in up to 256 subframes, and the DCI carried in the MPDCCH includes information about the number of MPDCCH repetitions. In DL scheduling, when the repeated transmission of the MPDCCH ends in subframe #N, the transmission of the PDSCH scheduled by the MPDCCH begins in subframe #N+2. The PDSCH can be repeatedly transmitted in up to 2048 subframes. The MPDCCH and PDSCH can be transmitted in different MTC subbands. In UL scheduling, when repeated MPDCCH transmission ends in subframe #N, MPDCCH-scheduled PUSCH transmission begins in subframe #N+4. For example, when the PDSCH is repeatedly transmitted in 32 subframes, the PDSCH may be transmitted in the first 16 subframes of the first MTC subband and in the remaining 16 subframes of the second MTC subband. MTC operates in half-duplex mode. MTC HARQ retransmissions are adaptive and asynchronous.

[0120] D. Narrowband Internet of Things (NB-IoT)

[0121] NB-IoT is a narrowband Internet of Things technology that supports low-power wide area networks through existing wireless communication systems (e.g., LTE or NR). In addition, NB-IoT can refer to a system that supports low complexity and low power consumption in narrowband (NB). Because the NB-IoT system uses the same OFDM parameters as existing systems such as SCS, there is no need to allocate additional bands separately for the NB-IoT system. For example, one PRB of the existing system band can be allocated to NB-IoT. Considering that the NB-IoT UE perceives a single PRB as a carrier, PRB and carrier can be understood as the same meaning in the description of NB-IoT.

[0122] NB-IoT can operate in multi-carrier mode. In NB-IoT, a carrier can be defined as an anchor type carrier (i.e., anchor carrier or anchor PRB) or a non-anchor type carrier (i.e., non-anchor carrier or non-anchor PRB). From the perspective of the BS, an anchor carrier may mean a carrier carrying narrowband PSS (NPSS), narrowband SSS (NSSS) and narrowband PBCH (NPBCH) for initial access, and narrowband PDSCH (NPDSCH) for narrowband system information blocks (N-SIB). That is, in NB-IoT, the carrier for initial access may be referred to as an anchor carrier, and other carriers may be referred to as non-anchor carriers. There may be one or more anchor carriers in the system.

[0123] Although NB-IoT is primarily described in the context of its application to legacy LTE systems, the description can be extended to next-generation systems (e.g., NR systems). In this disclosure, the description of NB-IoT can be extended to MTC, which serves similar technical purposes (e.g., low power, low cost, and CE). The term NB-IoT can be replaced with other equivalent terms such as NB-LTE, NB-IoT enhanced, enhanced NB-IoT, further enhanced NB-IoT, and NB-NR.

[0124] For the NB-IoT downlink, physical channels such as the narrowband physical broadcast channel (NPBCH), the narrowband physical downlink shared channel (NPDSCH), and the narrowband physical downlink control channel (NPDCCH) may be provided, and physical signals such as the narrowband primary synchronization signal (NPSS), the narrowband synchronization signal (NSSS), and the narrowband reference signal (NRS) may be provided.

[0125] The structure of the NB-IoT frame can vary according to the SCS. For example, the NB-IoT system can support an SCS of 15kHz and an SCS of 3.75kHz. However, the NB-IoT frame structure is not limited to this, and other SCSs (e.g., 30kHz, etc.) can also be considered for NB-IoT based on different time / frequency units. In addition, although the present disclosure describes the NB-IoT frame structure based on the LTE system frame structure, this is only for ease of description, and the present disclosure is not limited to this. Therefore, it is clear that the method proposed in the present disclosure is applicable to NB-IoT based on the frame structure of the next generation system (e.g., NR system).

[0126] The NB-IoT frame structure for 15kHz SCS can be configured to be the same as the frame structure of the above-mentioned legacy system (i.e., LTE system). That is, a 10ms NB-IoT frame can include 10 1ms NB-IoT subframes, each of which includes two 0.5ms NB-IoT time slots. Each 0.5ms NB-IoT time slot can include 7 OFDM symbols.

[0127] For 3.75kHz SCS, a 10ms NB-IoT frame consists of five 2ms NB-IoT subframes, each of which consists of seven OFDM symbols and a guard period (GP). The 2ms NB-IoT subframe can also be called an NB-IoT time slot or an NB-IoT resource unit (RU).

[0128] NB-IoT DL physical resources can be configured based on the configuration of physical resources in another wireless communication system (e.g., LTE or NR), except that the NR system bandwidth is a certain number of RBs (e.g., one RB, i.e., 180kHz). For example, when NB-IoT DL only supports 15kHz SCS, the NB-IoT DL physical resources can be configured as a resource region of one RB (i.e., one PRB) in the frequency domain. Figure 4 The resource grid of the LTE system illustrated in [1] is restricted as described above. Similarly, for the NB-IoT UL physical resource, the system bandwidth may be restricted to one RB.

[0129] Figure 9 Figure 1 illustrates the transmission of NB-IoT DL physical channels / signals. NB-IoT DL physical channels / signals are transmitted in one PRB and support 15kHz SCS / multi-tone transmission.

[0130] refer to Figure 9, NPSS is sent in the sixth subframe of each frame, and NSSS is sent in the last (e.g., tenth) subframe of each even-numbered frame. The UE can use the synchronization signals (NPSS and NSSS) to acquire frequency, symbol, and frame synchronization and search 504 for the physical cell ID (PCID) (i.e., BS ID). NPBCH is sent in the first subframe of each frame, carrying NB-MIB. NRS is provided as an RS for DL ​​physical channel demodulation and is generated in the same manner as in LTE. However, NB-PCID (NCell ID or NB-IoT BS ID) is used as an initialization value for generating the NRS sequence. NRS is sent over one or two antenna ports. Except for subframes carrying NPSS, NSSS, and NPBCH, NPDCCH and NPDSCH can be sent in the remaining subframes. NPDCCH and NPDSCH may not be sent in the same subframe. NPDCCH carries DCI, and DCI supports three DCI formats. DCI format N0 includes NPUSCH scheduling information, and DCI formats N1 and N2 include NPDSCH scheduling information. For CE, NPDCCH can be transmitted up to 2048 times. NPDSCH is used to transmit data (e.g., TB) for transport channels such as DL-SCH and Paging Channel (PCH). The maximum TB size (TBS) is 680 bits, and for CE, a TB can be repeated up to 2048 times.

[0131] E. Wake-up signal (WUS)

[0132] In MTC and NB-IoT, WUS can be used to reduce power consumption associated with paging monitoring. WUS is a physical layer signal that indicates whether the UE will monitor paging signals (e.g., MPDCCH / NPDCCH scrambled with a paging radio network temporary identifier (P-RNTI)) according to the cell configuration. When the UE is configured without eDRX (i.e., when the UE is configured with DRX only), WUS can be associated with one PO (N=1). On the other hand, when the UE is configured with eDRX, WUS can be associated with one or more POs (N≥1). Once WUS is detected, the UE can monitor N POs associated with the WUS. On the other hand, when no WUS is detected, the UE can skip PO monitoring and remain in sleep mode until the next WUS is monitored.

[0133] Figure 10 The timing relationship between WUS and PO is illustrated.

[0134] The UE can receive configuration information about the WUS from the BS and monitor the WUS based on the WUS configuration information. The WUS configuration information may include, for example, the maximum WUS duration, the number of consecutive POs associated with the WUS, gap information, etc. The maximum WUS duration may refer to the maximum time period over which the WUS can be transmitted. The maximum WUS duration may be expressed as a ratio of the maximum number of repetitions (e.g., Rmax) associated with the PDCCH (e.g., MPDCCH, NPDCCH). The UE may expect to repeatedly transmit the WUS within the maximum WUS duration, but the actual number of WUS transmissions within the maximum WUS duration may be less than the maximum number of WUS transmissions. For example, if the UE is in good coverage, the number of WUS repetitions may be less. For convenience, the resources / opportunities on which the WUS can be transmitted within the maximum WUS duration may be referred to as WUS resources. WUS resources may be defined as a number of consecutive OFDM symbols and a number of consecutive subcarriers. WUS resources may be defined as a number of consecutive OFDM symbols and a number of consecutive subcarriers in a subframe or time slot. For example, WUS resources may be defined as 14 consecutive OFDM symbols and 12 consecutive subcarriers. If the UE detects a WUS, the UE may not perform WUS monitoring until the first PO associated with the WUS. If the UE does not detect a WUS within the maximum WUS duration, the UE may not monitor the paging signal during the PO associated with the WUS (or remain in sleep mode).

[0135] F. Symbols, Abbreviations and Terminology

[0136] The following symbols / abbreviations / terms are used in this document.

[0137] PDCCH: PDCCH stands for Physical Downlink Control Channel. PDCCH refers to the physical layer communication channel used to provide DCI. The methods presented in this disclosure are applicable to various PDCCH structures, such as enhanced PDCCH (EPDCCH), MPDCCH, and NPDCCH, even when not specifically mentioned. In this document, PDCCH is used as a term to refer to various PDCCH structures, unless otherwise specified.

[0138] -DCI: DCI is the abbreviation of Downlink Control Information.

[0139] Acknowledgement / Negative Acknowledgement (A / N) for cell A: A / N for cell A refers to A / N information of a DL signal (e.g., data (e.g., PDSCH) or a control channel (e.g., PDCCH related to semi-persistent scheduling (SPS))) received on cell A. The A / N information may be referred to as ACK / NACK information.

[0140] - Added MO: Added MO refers to an additional modulation sequence or a modulation sequence used additionally.

[0141] -WUS: WUS refers to wake-up signal.

[0142] -UE group WUS (or group WUS). The UE group WUS is a WUS that can be identified for each group. Here, each group can be obtained by grouping UEs monitoring the same PO into multiple groups.

[0143] -Public WUS: Public WUS refers to a WUS that is common to multiple UE groups.

[0144] - Legacy WUS: Legacy WUS refers to a WUS monitored by a WUS-capable UE that does not have the ability to identify a UE group monitoring the same PO (e.g., a WUS-capable UE defined in 3GPP Technical Specification (TS) Release 15). In other words, legacy WUS refers to a WUS for a WUS-capable UE that does not support (UE) Group WUS.

[0145] - Traditional WUS resources: Traditional WUS resources refer to resources used to send and receive traditional WUS. For example, Figure 10 Specifically, the UE may determine the end time of the maximum WUS duration including the legacy WUS resources by applying the gap information to the PO configured for the UE, and the BS may determine the end time of the maximum WUS duration including the legacy WUS resources by applying the gap information for the specific UE to the PO configured for the specific UE.

[0146] -PAPR: PAPR is the abbreviation of Peak to Average Power Ratio.

[0147] -PRB: PRB is the abbreviation of physical resource block.

[0148] -PRB pair: A PRB pair refers to two RBs located one after another in two time slots of a subframe.

[0149] -PO: PO is the abbreviation of Paging Occasion.

[0150] -WUS to PO gap: WUS to PO gap refers to the gap between the start time of PO and the end time of WUS sending.

[0151] -Release 15: Release 15 refers to 3GPP TS Release 15.

[0152] -Release 16: Release 16 refers to 3GPP TS Release 16.

[0153] G. Methods proposed in this disclosure

[0154] The present disclosure proposes a method of determining a WUS sequence for each time domain and / or frequency domain resource when a UE group WUS is used and when the UE group WUS is identified through multiple resources in the time domain and / or frequency domain.

[0155] In LTE Release 15 NB-IoT and MTC, WUS was introduced for the purpose of UE power saving. WUS is a signal indicating whether there is actual paging transmission in the paging search space at a specific location. When the BS aims to send paging on the PO at a specific location, the BS may send WUS at the WUS sending position associated with the corresponding PO. The UE may monitor the WUS sending position associated with the PO at a specific location, and if the UE detects WUS at the WUS sending position, the UE may expect that paging will be sent on the corresponding PO. If the UE does not detect WUS at the WUS sending position, the UE may expect that there is no paging on the corresponding PO, thereby reducing power consumption.

[0156] In LTE Release 16 NB-IoT and MTC, the introduction of UE group WUS (or group WUS) to improve the power saving effect of Release 15 WUS has been discussed. In the case of Release 15 WUS, all UEs with the same DRX (or eDRX) state and configured with the same WUS to PO gap are configured to expect the same WUS. Therefore, when the BS sends WUS to other UEs using the same PO, the UE may always try to decode the related paging, regardless of whether the paging is targeted at the UE. This may increase unnecessary power consumption of the UE and become an obstacle to power saving. In order to solve such problems, the grouping of UEs monitoring the same PO into multiple groups and the use of UE group WUS that can be identified for each group have been discussed in Release 16.

[0157] When UE group WUS is applied, if the UE detects the UE group WUS of the UE group to which the UE belongs, the UE may monitor the paging signal on the PO configured for the UE. On the other hand, if the UE detects the UE group WUS for another UE group to which the UE does not belong, the UE may not monitor any paging signal on the PO configured for the UE (or skip monitoring). Therefore, when using the UE group WUS of Release 16, the UE can be prevented from monitoring the paging signal after detecting the group WUS for another UE group, thereby reducing unnecessary power consumption of the UE and maximizing the power saving effect.

[0158] The present disclosure proposes a method for solving problems that may occur due to PAPR increase and time offset error when using a UE group WUS and when identifying the UE group WUS through time / frequency domain resources.

[0159] (Method 0)

[0160] In method 0, a method of determining a phase shift value of a UE group WUS sequence included in a WUS sequence set when a UE group WUS sequence capable of identifying a UE group based on a phase shift is used and when multiple WUS sequence sets are configurable is proposed.

[0161] In this case, the WUS sequence using phase shift-based UE group identification can be defined according to the following equation 1. When the proposed method is applied to NB-IoT or MTC, if the following conditions are met: m = 0, 1, ..., 131 and m' = m + 132x, then w group (m') may represent a WUS sequence of the (x+1)th subframe from the point (or time) at which WUS transmission starts. In the following formula 1, g represents a parameter selected by a UE group index, G represents the total number of UE groups, and f(g, G, m) represents a function for generating a phase shift. In addition, w(m') represents a basic sequence to which no phase shift is applied, and for example, the WUS sequence defined in Release 15 (see clauses 6.11B and 10.2.6B of 3GPP TS 36.211 V15.5.0) may be used as w(m'). This specification may include all Release 15 specification documents by reference.

[0162] [Formula 1]

[0163] w group (m′)=w(m′)f(g, G, m)

[0164] For example, f(g,G,m) as a function that produces a phase shift can be defined as follows: In this example, Equation 1 can be expressed as shown in Equation 2 below.

[0165] [Formula 2]

[0166]

[0167] As an example of the proposed method, N can be configured SEQ WUS sequence sets. If the index of the WUS sequence set is i SEQ =1, ..., N SEQ -1, the value of g, which is a parameter for determining the phase shift value, can be determined according to Formula 3 as follows.

[0168] [Formula 3]

[0169] g=(N SEQ ×α-i SEQ )×g0

[0170] In Equation 3, α is a parameter used to determine the WUS sequence in the WUS sequence set and may be determined by the UE_ID of the UE, specified by the BS, or predetermined by the specification for the purpose of public WUS. For example, the UE_ID, which is unique information about the UE, may be a parameter defined in Release 15 (see clause 7.1 of 3GPP TS 36.304 V15.4.0). This specification may include all Release 15 specification documents by reference.

[0171] In formula 3, N SEQ The value of may be predetermined by the specification. SEQ The value of can be determined by the BS or configured through signaling. This has the advantage that the BS can freely adjust the expected performance of the WUS sequence by controlling the number of WUS sequence sets according to the situation. Alternatively, N SEQ The value of may be implicitly determined by the number of different time / frequency domain WUS resources used for the UE group WUS. For example, when there is only one time / frequency WUS resource used for the UE group WUS, N SEQ Can be set to 1. If multiple time / frequency WUS resources are used, N SEQ It can be set to 2. This has the advantage that the number of WUS sequence sets can be supported according to the situation and the signaling overhead can be reduced.

[0172] In formula 3, i SEQ It can vary depending on the time / frequency location of the WUS resource used. In this case, i SEQ The value of may be determined by an index of a WUS resource, determined by unique information about the UE (eg, UE_ID), or specified by the BS through signaling.

[0173] (Method 1)

[0174] In method 1, it is assumed that a UE group WUS sequence capable of identifying a UE group based on a phase shift is used, and two or more frequency domain WUS resources are configured on the same time domain resource.

[0175] In the method proposed in Method 1, the phase-shift-based UE group WUS sequence may be generated according to Equation 1. As a specific example, when Equation 2 is used, the value of g may be determined according to the method proposed in Method 1.

[0176] According to the method proposed in Method 1 of the present disclosure, when using Equation 1 (or Equation 2) and when multiple frequency domain resources are configured on the same time domain resource, the value of g in Equation 1 can be determined so that the following two conditions are met.

[0177] (Condition 1-1) The phase interval between different UE groups WUS using the same frequency domain resources is maximized.

[0178] (Condition 1-2) The value of g varies differently between different UE groups WUS using different frequency domain resources.

[0179] As an example satisfying the above conditions, it can be considered that method 1 is applied to the MTC UE group WUS. Figure 11 The schematic diagram shows an example of applying UE group WUS by using two orthogonal frequency domain resources, each resource having a size of two PRBs in MTC. If the set of phase shift values ​​of the WUS sequence for UE group WUS is {g1, g2, g3, ... g N} and if method 1 is applied so that Figure 11 In the example above, if the above conditions are met, then {g1,g3,…,g (N-1)} and {g2,g4,…,g N} can be used for WUS resource 0 and WUS resource 1 respectively.

[0180] In particular, in the above example, it can be considered that all adjacent phase shift values ​​have a constant phase interval. In other words, it can be considered that there is a reference phase shift value g0, and the phase shift value with the ath magnitude in ascending order in the set of phase shift values ​​satisfies the following relationship: g a =g0×a. In this case, in order to satisfy the above conditions, it can be determined that the phase shift value with an odd a value and the phase shift value with an even a value are used for different frequency domain WUS resources. Figure 11 In the example of , it can be determined that the phase shift value with an odd a value is used for WUS resource 0, and the phase shift value with an even a value is used for WUS resource 1.

[0181] In the above example, the value of a can be determined by the index of the UE group. This can be interpreted as meaning that the position of the frequency domain WUS resource related to the UE group and its phase shift value can be determined by the index of the UE group. Figure 11 In the example, the UE with UE group index a can be configured to use the phase shift value g 0× a, and the position of the frequency-domain WUS resource can be determined according to whether a is an even number or an odd number (for example, when a is an odd number, WUS resource 0 can be selected, and when a is an even number, WUS resource 1 can be selected).

[0182] When multiple frequency-domain WUS resources are allocated on the same time-domain resource, Method 1 has the advantage of preventing an increase in PAPR due to the simultaneous transmission of multiple UE group WUS signals. If WUS sequences with the same phase shift value are transmitted on multiple frequency-domain WUS resources, PAPR may increase, which occurs when the same sequence is repeated in the frequency domain. Furthermore, when applying a phase-shift-based WUS sequence generation rule, Method 1 has the advantage of reducing false alarms caused by timing drift errors in UE group WUS signals by extending the phase distance between UE groups using the same time-domain and frequency-domain WUS resources.

[0183] When two or more time domain WUS resources are configured on one frequency domain resource, the principle of method 1 mentioned above can be equally applied. Figure 12 As shown in FIG, there are two time-domain WUS resources associated with one PO, and the available phase shift value in WUS resource 1 and the available phase shift value in WUS resource 0 can be determined in the same manner as when determining the phase shift values ​​applied to different frequency-domain WUS resources according to method 1.

[0184] (Method 2)

[0185] In method 2, it is assumed that multiple time-domain resources are used for a UE group WUS associated with one PO, and one or more frequency-domain WUS resources can be configured on each time-domain WUS resource.

[0186] According to the method proposed in method 2 of the present disclosure, when one or more frequency-domain WUS resources are available on the same time-domain WUS resource and when there are multiple time-domain WUS resources, it can be determined that the following two conditions need to be met.

[0187] (Condition 2-1) When multiple WUS resources are located on the same frequency-domain WUS resource and simultaneously located on different time-domain WUS resources, it can be determined that the multiple WUS resources need to use different UE group WUS sequence sets.

[0188] (Condition 2-2) When multiple WUS resources are located on the same time-domain WUS resource and simultaneously located on different frequency-domain WUS resources, it can be determined that the multiple WUS resources need to use different UE group WUS sequence sets.

[0189] The UE group WUS sequence set refers to a set of WUS sequences that can be used by UEs belonging to the UE group. In this case, the UEs belonging to the UE group can expect one or more WUS sequences in the UE group WUS sequence set.

[0190] As an example of satisfying the above conditions, it can be considered that Method 2 is applied to the UE group WUS for MTC. In this case, there may be a predefined rule between each PRB pair (e.g., frequency-domain WUS resource unit in MTC) and the WUS sequence set, and such a rule may vary for time-domain WUS resources. For example, the relationship between WUS resources and WUS sequence sets may be defined according to the rules shown in Table 4.

[0191] In Table 4 below, Set-A and Set-B may be indexes for identifying a WUS sequence set or parameter values ​​for generating a WUS sequence.

[0192] [Table 4]

[0193] Index of PRB pairs within narrowband Sequence set of the second time domain Sequence set of the first time domain 2 Set A Set B 1 Set B Set A 0 Set A Set B

[0194] When Table 4 is used and when two frequency domain WUS resources are used on the same time domain resource, the two frequency domain WUS resources can be determined to be always adjacent to each other. For example, in Table 4, it can be determined that only PRB pair indexes: {0, 1} or {1, 2} are available. This can prevent inefficiencies from occurring because if the PRB pair indices of the frequency domain WUS resources are separated from each other as in {0, 2}, it is difficult to use a PRB pair index of 1 in the frequency domain. At the same time, this can also prevent the phenomenon of increased PAPR due to repeating the same WUS sequence on the same time domain WUS resource. For this purpose, the BS can inform the number of frequency domain WUS resources used on a specific time domain WUS resource, and at the same time also inform whether the position of the PRB pair used is {0, 1} or {1, 2}.

[0195] Figure 13 The example of configuring two time domain WUS resources for the UE group WUS in MTC and configuring two orthogonal frequency domain WUS resources of two PRBs in size on each time domain WUS resource is shown schematically. Figure 13 In the example, different WUS sequence sets may be configured to be used for WUS resource 2A and WUS resource 2B. In addition, the WUS sequence set for WUS resource 2A may be used for WUS resource 1B and the WUS sequence set for WUS resource 2B may be used for WUS resource 1A.

[0196] (Method 3)

[0197] In Method 3, it is assumed that multiple time domain resources can be configured for a UE group WUS associated with a PO. As a specific example of the method proposed in Method 3, when using UE group WUS in NB-IoT, it can be considered that the BS configures one or two time domain WUS resources to support UE group WUS. In this case, the WUS resources used for UE group WUS can include WUS resources available for legacy WUS (i.e., WUS defined in Release 15).

[0198] According to the method proposed in Method 3, if the scrambling initialization value of the WUS is varied to use a different WUS sequence for each WUS resource, the scrambling initialization value may be determined as a relative position to the WUS resource of the legacy WUS.

[0199] In this case, the scrambling initialization value may be determined as the (initialization) value for generating the scrambling sequence, which is used to generate w(m) in Equation 2. Alternatively, the scrambling initialization value may be defined as the value for generating the scrambling sequence in Equation 4. Initialization value of, where Equation 4 is used for Release 15 MTC and NB-IoT.

[0200] [Formula 4]

[0201]

[0202] x=0,1,…,M-1

[0203] In formula 4, w(m) represents the WUS sequence, denotes cell identification information (eg, physical cell identity (ID)) about a cell in which the UE operates, and mod denotes a modulo operation.

[0204] Based on this structure, the method proposed in method 3 can be proposed to determine the scrambling initialization value according to the following formula 5. In formula 5, the resource identification information c can be determined g , so that the WUS resources are determined as relative positions to the legacy WUS resources. For example, if the position of the WUS resources of the UE group WUS used by a specific UE is the same as the position of the WUS resources of the legacy WUS, then c g On the other hand, if the location of the WUS resource of the UE group WUS is different from the location of the legacy WUS resource (for example, if the WUS resource is configured to be adjacent to the legacy WUS resource), then c g may be determined to have a value of 1. In this example, the first WUS resource may be configured to include a legacy WUS resource, and the second WUS resource may be configured to immediately precede the first WUS resource in the time domain.

[0205] [Formula 5]

[0206]

[0207] In formula 5, c init_WUS Indicates the scrambling initialization value, c g Indicates the resource identification information of the WUS resource to be monitored by the UE, Indicates the cell identity information about the cell in which the UE operates, n f_start_PO Indicates the first frame of the first (or starting) PO associated with the UE group WUS, n s_start_PO represents the first time slot of the first PO associated with the UE group WUS, = represents a floor operation, and mod represents a modulo operation. As shown in Formula 5, the scrambled initialization value c init_WUS It may include at least 30 bits from bit #0 to bit #30. Specifically, the scrambling initialization value c init_WUS Can be configured to include cell identification information from bit #0 and includes the resource identification information c of the resource for the UE group WUS from position #29 g In addition, the scrambled initialization value c init_WUS Can be configured to include information from bit #9 about the starting position of PO in the time domain (e.g., ). According to Formula 5, since different scrambling sequences can be generated based on the resource identification information of the WUS resource, the UE group WUS can be identified for each resource used for the UE group WUS.

[0208] Figure 14 The following schematically illustrates an example of applying the method based on Formula 5 to Method 3. Figure 14 In the example of , WUS resource 0 can be used as a legacy WUS resource, and both or either WUS resource 0 or WUS resource 1 can be used as a UE group WUS resource. When both WUS resource 0 and WUS resource 1 are used as UE group WUS resources, WUS resource 0 can be configured to include a legacy WUS resource, and WUS resource 1 can be configured to be immediately before WUS resource 0 in the time domain. In this case, a UE expecting a UE group WUS on WUS resource 0 can be configured to have a value c in Equation 5. g = 0, and a UE expecting UE group WUS on WUS resource 1 may be configured to have a value c in Equation 5 g = 1. In this example, the WUS sequence associated with the WUS resources for a specific UE is based on the initialization value c init_WUS The generated scrambling sequence w(m) is given by the WUS sequence, which is initialized based on the resource identification information c about the WUS resource for a specific UE. gBased on the fact that the WUS resource for the specific UE is WUS resource 0, the resource identification information of the WUS resource for the specific UE may have a value of 0. Based on the fact that the WUS resource for the specific UE is WUS resource 1, the resource identification information of the WUS resource for the specific UE may have a value of 1.

[0209] The advantage of the method proposed in method 3 is that there is no additional signaling overhead because the method follows the predetermined UE group WUS sequence generation rules. In addition, when the location of the traditional WUS resource is used for the UE group WUS and when the traditional WUS is used as the common WUS for the UE group WUS, the same WUS sequence (generation) rules can be applied.

[0210] As another example, you can apply Figure 14 The opposite of the example. That is, c g It may be configured to have a value of 1 for WUS resource 0, which is the location of the legacy WUS resource, and a value of 0 for WUS resource 1. This operation may be performed because the legacy WUS is not used as the common WUS at the location of WUS resource 0. This reverse operation may be explicitly specified by higher-layer signaling. Alternatively, this operation may be implicitly specified and interpreted by higher-layer signaling, which indicates whether the legacy WUS sequence is used as the common WUS sequence for the UE group WUS at the location of WUS resource 0.

[0211] (Method 4)

[0212] In Method 4, it is assumed that one or more time domain resources can be used for a UE group WUS associated with one PO, and one or more frequency domain WUS resources can be configured on each time domain WUS resource. As a specific example of the method proposed in Method 4, when a UE group WUS is used in MTC, it can be configured so that the BS configures one or two time domain WUS resources for the UE group WUS, and the BS configures one or two frequency domain WUS resources for the UE group WUS on each time domain resource. In this case, the WUS resources used for the UE group WUS may or may not include the WUS resources available for the legacy WUS (WUS defined in Release 15).

[0213] According to the method proposed in Method 4, when the scrambling initialization value of the WUS changes to distinguish the WUS sequence used in any WUS resource from the WUS sequence used in another WUS resource in the same time domain (or frequency domain), the scrambling initialization value can be determined as the relative position of the WUS resource with respect to the conventional WUS.

[0214] In this case, the scrambling initialization value may be determined as a value for generating a scrambling sequence, using which w(m) in Equation 2 is generated. Alternatively, the scrambling initialization value may be defined as a value for generating a scrambling sequence in Equation 4. Initialization value of, where Equation 4 is used for Release 15 MTC and NB-IoT.

[0215] Based on this structure, the method proposed in method 4 can be proposed to determine the scrambling initialization value according to formula 5. In formula 5, c g It can be determined so that the WUS resources are determined as relative positions to the conventional WUS resources. For example, if the position of the WUS resources of the UE group WUS used by a specific UE is the same as the position of the WUS resources of the conventional WUS, then c g On the other hand, if the location of the WUS resources of the UE group WUS is different from the location of the legacy WUS resources (for example, if the WUS resources are configured immediately before the legacy WUS resources), c may be determined according to the following conditions: g .

[0216] - If the UE group WUS resource and the legacy WUS resource are located at the same position in the time domain but at different positions in the frequency domain, then c g Can be configured to have a value of 1.

[0217] - If the UE group WUS resources and the legacy WUS resources are located at the same location in the frequency domain but at different locations in the time domain, then c g Can be configured to have a value of 1.

[0218] - If the UE group WUS resources and the legacy WUS resources are located at different locations in the time domain and the frequency domain, then c g Can be configured to have a value of 0.

[0219] Figure 15 The following schematically illustrates an example of applying the method based on Formula 5 to Method 4. Figure 15 In the example of FIG, WUS resource 1B can be used as a conventional WUS resource, and one or more of WUS resource 1A, WUS resource 1B, WUS resource 2A, and WUS resource 2B can be used as a UE group WUS resource. In this case, a UE that desires UE group WUS on WUS resource 1B or WUS resource 2A can be configured to have a value c in Equation 5. g =0, and a UE expecting UE group WUS on WUS resource 1A or WUS resource 2B may be configured to have a value c in Equation 5 g =1.

[0220] The method proposed in Method 4 has the advantage of no additional signaling overhead because it follows the predefined WUS sequence generation rules for the UE group. Furthermore, the same WUS sequence (generation) rules can be applied when the location of the conventional WUS resource is used for the UE group WUS and when the conventional WUS is used as a common WUS for the UE group WUS. Furthermore, by allowing UE group WUSs using the same time domain resources to use different sequences, PAPR reduction can be achieved. Furthermore, by allowing UE group WUSs using the same frequency domain resources to use different sequences, time drift errors can be prevented.

[0221] As another example, you can apply Figure 15 The opposite of the example. That is, c g It can be configured to have a value of 1 for WUS resource 1B and WUS resource 2A, and a value of 0 for WUS resource 1A and WUS resource 2B. This operation may be performed because the traditional WUS is not used as the common WUS at the location of WUS resource 1B. This reverse operation may be explicitly specified by higher-layer signaling. Alternatively, this operation may be implicitly specified and interpreted by higher-layer signaling, which indicates whether the traditional WUS sequence is used as the common WUS sequence for the UE group WUS at the location of WUS resource 0.

[0222] (Method 4-1)

[0223] In Method 4-1, configuring two UE group WUS resources on the same time domain WUS resources without using legacy WUS resources can be considered as a special case of the structure that can be considered in Method 4. For example, when using UE group WUS in MTC, the two UE group WUS resources can be configured in the same time domain as that used by legacy WUS, and the two UE group WUS resources do not overlap with the legacy WUS resources.

[0224] Figure 16 An example of method 4-1 is schematically illustrated. Figure 16 In the example, since traditional WUS resources are not affected by c g The effect of c g = 0. WUS resource 0 and WUS resource 1 can be configured with different c g Value. Figure 16 In the example, WUS resource 0 is configured with a value of c g =1, and WUS resource 1 is configured with value c g =0 and vice versa.

[0225] (Method 4-2)

[0226] In Method 4-2, another method for achieving the same effect as the method proposed in Method 4 is to configure all WUS resources to have different scrambling initialization values. In this case, the scrambling initialization value of each WUS resource can be predetermined based on its relative position to the traditional WUS resource. For example, if up to four UE group WUS resources can be configured in MTC, a total of four scrambling initialization values ​​can be used. Depending on its relative position to the traditional WUS resource, the initial scrambling value applied to each WUS resource can be configured to have one of 0 to 3.

[0227] Figure 17 The example proposed in Method 4-2 is schematically illustrated. Figure 17 In the example of FIG, WUS resource 1B refers to a UE group WUS resource configured in the same time domain and frequency domain as a conventional WUS resource. In this case, WUS resource 1B may be configured to have a value of c g = 0. The remaining three WUS resources can be configured with values ​​c g = 1 to 3 without overlap.

[0228] For ease of explanation, Figure 17 c shown in g Therefore, it is obvious that when different scrambling initialization values ​​are determined according to a predetermined rule, the principles or ideas of the present disclosure are equally applicable.

[0229] (Method 5)

[0230] In Method 5, it is assumed that the traditional WUS resource and the UE group WUS resource can be configured at different locations. Furthermore, it is assumed that the common WUS sequence and the UE group WUS sequence are identified by a phase shift value on a single WUS resource. In this case, for example, the phase shift value can be determined by the g value in Equation 2. The method proposed in Method 5 can be applied to determine the common WUS sequence in the UE group WUS.

[0231] For the approach proposed in Method 5, one of the following options can be used.

[0232] - Option 5-1) If the UE group WUS resource is not a legacy WUS resource, the g value used to generate the common WUS sequence may be predefined by the specification.

[0233] - Option 5-2) If the UE group WUS resource is not a legacy WUS resource, a g value for generating a common WUS sequence may be configured for each WUS resource. In this case, the g value may be configured for each WUS resource through a higher layer signal.

[0234] - Option 5-3) If the UE group WUS resource is not a legacy WUS resource, the g value used to generate the common WUS sequence can be set to the same as the g value used to generate the common WUS sequence for the legacy WUS resource. If the g value for the legacy WUS resource is indicated by a higher layer signal, the g value can be applied to other WUS resources.

[0235] (Method 6)

[0236] In Method 6, it is proposed that when g of Equation 2 is configured to have a value other than 0 (ie, when a legacy WUS sequence is not used as a common WUS sequence), a phase shift value of the common WUS sequence is determined based on the number of UE groups.

[0237] For example, it can be assumed that the g value is determined according to the following equation 6. In equation 6, α is a predetermined integer value, and for example, the value of α can be 14. The UE group index refers to an index used by the UE to determine the UE group WUS sequence. If the BS is configured to use N UE groups for any WUS resource, the UE group index can be configured to have a value between 0 and N-1.

[0238] [Formula 6]

[0239] g = a·(UE group index + 1)

[0240] If, under the above assumption, the common WUS sequence is determined to have a phase shift value different from the phase shift value of the traditional WUS sequence, the g value used to determine the phase shift value of the common WUS sequence can be defined as follows: g = α·(N+1), where N represents the number of UE groups used for any WUS resource as described above.

[0241] The purpose of the proposed method is to maintain a minimum phase difference between the common WUS sequence and other WUS sequences (eg, UE group WUS sequence, legacy WUS sequence, etc.).

[0242] Flowchart of the operation of the method proposed in this disclosure

[0243] Figure 18 and Figure 19 The flowchart illustrates BS operations and UE operations to which the method proposed in the present disclosure is applied.

[0244] (1) BS operation

[0245] Figure 18 A flow chart illustrating the operation of a BS to which the method proposed in the present disclosure is applied is shown.

[0246] Reference Figure 18, the BS may generate at least one sequence (or at least one WUS sequence) of a WUS (S1802). For example, the BS may generate a WUS sequence based on one of Method 0, Method 1, Method 2, Method 3, Method 4, Method 5, and Method 6 proposed in this disclosure, or any combination thereof. In this example, the at least one (WUS) sequence may include a WUS sequence (or a UE group WUS sequence) for a UE group to which a specific UE intended to receive a paging signal belongs.

[0247] The BS may transmit at least one WUS based on the generated WUS sequence (S1804). For example, the at least one WUS may include a WUS for a UE group (or a UE group WUS) (or a group WUS) to which a specific UE intended to receive a paging signal belongs. In this example, the BS may transmit a WUS (a UE group WUS or a group WUS) to the UE group based on the WUS sequence for the UE group (or a UE group WUS sequence).

[0248] The BS may transmit a paging signal on the PO associated with the transmitted WUS (e.g., UE group WUS or group WUS) (S1806). For example, the paging signal may include a control channel associated with the paging message (e.g., a PDCCH scrambled with a P-RNTI, a PDCCH for paging, an MPDCCH, or an NPDCCH).

[0249] (2)UE operation

[0250] Figure 19 The flowchart illustrates the operation of a UE to which the method proposed in the present disclosure is applied.

[0251] The UE may generate at least one WUS sequence (or at least one WUS sequence) (S1902). For example, the UE may generate a WUS sequence based on one or any combination of Method 0, Method 1, Method 2, Method 3, Method 4, Method 5, and Method 6 proposed in this disclosure. In this example, the at least one WUS sequence may include a WUS sequence for a UE group to which the UE belongs (or a UE group WUS sequence).

[0252] The UE may attempt to detect at least one WUS based on the generated WUS sequence (S1904). For example, based on the WUS sequence (or UE group WUS sequence) for the UE group to which the corresponding UE belongs, the UE may attempt to detect the WUS (or UE group WUS) (or group WUS) for the UE group to which the corresponding UE belongs.

[0253] If the UE detects a WUS (S1904), the UE may monitor a paging signal (on the PO associated with the detected WUS) (S1906). For example, the paging signal may include a control channel associated with a paging message (e.g., a PDCCH scrambled with a P-RNTI, a PDCCH for paging, an MPDCCH, or an NPDCCH). If the UE does not detect a WUS (S204), the UE may not monitor the paging signal during the PO (or may skip monitoring the paging signal during the PO).

[0254] The method proposed in the present disclosure has been described based on MTC and / or NB-IoT systems, but the method proposed in the present disclosure is not limited to MTC and / or NB-IoT. For example, the method proposed in the present disclosure can be applied to a 3GPP 5G NR system (for example, a system according to 3GPP TS 38.XXX). Specifically, a method for supporting UEs with reduced capability (RedCap) in an NR system is being discussed. As a method for improving power saving in RedCap UEs, a sequence-based wake-up signal or channel can be used to prevent a UE operating in IDLE mode DRX from waking up unnecessarily. If the UE detects a wake-up signal or channel configured for the UE by monitoring (or attempting to detect) the wake-up signal or channel on time and / or frequency domain resources used for the wake-up signal or channel, the UE can monitor and / or receive subsequent channels related to the wake-up signal or channel (for example, control or shared channels related to paging). If the UE does not detect the wake-up signal or channel configured for the UE on the time domain and / or frequency domain resources used for the wake-up signal or channel, the UE may not monitor and / or receive subsequent channels related to the wake-up signal or channel (for example, control or shared channels related to paging) (or may skip monitoring and / or reception of subsequent channels). Similarly, the BS may send the wake-up signal or channel configured for the UE to the UE on the time domain and / or frequency domain resources used for the wake-up signal or channel. The BS may then send subsequent channels related to the wake-up signal or channel to the UE. In order to generate / obtain a sequence of wake-up signals or channels for RedCap UEs (operating in IDLE mode DRX) in an NR system, methods 1 to 6 of the present disclosure may be applied equally / similarly.

[0255] H. Communication Systems and Devices Using the Present Disclosure

[0256] Various details, functions, procedures, proposals, methods and / or operational flowcharts related to the above-described methods in this document can be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0257] Hereinafter, a description will be given in detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise specified, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0258] Figure 20 A communication system 1 applied to the present disclosure is shown.

[0259] refer to Figure 20 , the communication system 1 applied to the present disclosure includes wireless devices, BS and network. Wireless devices refer to devices that perform communication through radio access technology (RAT) (such as 5G new RAT (NR) or LTE), which may also be called communication / radio / 5G devices. Wireless devices may include, but are not limited to: robots 100a, vehicles 100b-1 and 100b-2, extended reality (XR) devices 100c, handheld devices 100d, home appliances 100e, IoT devices 100f and artificial intelligence (AI) devices / servers 400. For example, vehicles may include vehicles equipped with wireless communication functions, autonomous vehicles and vehicles capable of performing vehicle-to-vehicle (V2V) communication. Vehicles may include unmanned aerial vehicles (UAVs) (such as drones). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the following forms: head-mounted devices (HMDs), heads-up displays (HUDs) installed in vehicles, televisions (TVs), smart phones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices may include smartphones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptops). Home appliances may include televisions, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a specific wireless device 200a may serve as a BS / network node for other wireless devices.

[0260] Wireless devices 100a to 100f can be connected to a network 300 via a BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can be connected to an AI server 400 via the network 300. The network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. While wireless devices 100a to 100f can communicate with each other via the BS 200 / network 300, wireless devices 100a to 100f can communicate directly with each other (e.g., sidelink communication) without the intervention of the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., V2V / Vehicle-to-Everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0261] Wireless communication / connection 150a, 150b, or 150c can be established between wireless devices 100a to 100f and BS 200, or between BSs 200. Here, the wireless communication / connection can be established through various RATs (e.g., 5G NR), such as UL / DL communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication 150c (e.g., relay, integrated access backhaul (IAB)). The wireless device and BS / wireless device and BS can transmit / receive radio signals between each other through the wireless communication / connection 150a, 150b, and 150c. To this end, various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of the resource allocation process for transmitting / receiving radio signals can be performed based on various proposals of the present disclosure.

[0262] Figure 21 The diagram is applicable to the wireless device of the present disclosure.

[0263] refer to Figure 21 , the first wireless device 100 and the second wireless device 200 can transmit radio signals through various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 20 {wireless devices 100a to 100f and BS 200} and / or {wireless devices 100a to 100f and wireless devices 100a to 100f}.

[0264] The first wireless device 100 may include at least one processor 102 and at least one memory 104, and may further include at least one transceiver 106 and / or at least one antenna (antenna unit) 108. The processor 102 may control the memory 104 and / or the transceiver 106 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be coupled to the processor 102 and store various types of information related to the operation of the processor 102. For example, the memory 104 may store software code including commands for executing part or all of the processes controlled by the processor 102, or commands for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be coupled to the processor 102 and transmit and / or receive radio signals via the at least one antenna 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with an RF unit. In this disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0265] The second wireless device 200 may include at least one processor 202 and at least one memory 204, and may further include at least one transceiver 206 and / or at least one antenna 208. The processor 202 may control the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be coupled to the processor 202 and store various types of information related to the operation of the processor 202. For example, the memory 204 may store software code including commands for executing part or all of the processes controlled by the processor 202, or commands for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be coupled to the processor 202 and transmit and / or receive radio signals via the at least one antenna 208. The transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In this disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0266] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. The one or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, an SDU, a message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, and provide the generated signal to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from the one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein.

[0267] The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein may be implemented in firmware or software, which may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein may be included in the one or more processors 102 and 202, or may be stored in the one or more memories 104 and executed by the one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flow diagrams disclosed herein may be implemented as code, instructions, and / or a set of instructions in firmware or software.

[0268] The one or more memories 104 and 204 can be coupled to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. The one or more memories 104 and 204 can be configured as read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, buffer memory, computer-readable storage media and / or combinations thereof. The one or more memories 104 and 204 can be located inside and / or outside the one or more processors 102 and 202. The one or more memories 104 and 204 can be coupled to the one or more processors 102 and 202 via various technologies, such as wired or wireless connections.

[0269] The one or more transceivers 106 and 206 can transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operational flowcharts herein to one or more other devices. The one or more transceivers 106 and 206 can receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein from the one or more other devices. For example, the one or more transceivers 106 and 206 can be coupled to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 can control the one or more transceivers 106 and 206 to transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 can control the one or more transceivers 106 and 206 to receive user data, control information, or radio signals from one or more other devices. The one or more transceivers 106 and 206 may be coupled to the one or more antennas 108 and 208, and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels as described in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein via the one or more antennas 108 and 208. In this context, the one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals in order to process the received user data, control information, radio signals / channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals / channels, etc. processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0270] Figure 22 FIG. 1 is another example of a wireless device applied to the present disclosure. The wireless device may be implemented in various forms according to the use case / service (refer to FIG. Figure 20 ).

[0271] refer to Figure 22 , wireless devices 100 and 200 may correspond to Figure 21The wireless devices 100 and 200 in the embodiment of the present invention may be configured into various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and (one or more) transceivers 114. For example, the communication circuit 112 may include Figure 21 The one or more processors 102 and 202 and / or the one or more memories 104 and 204. For example, the one or more transceivers 114 may include Figure 21 The one or more transceivers 106 and 206 and / or the one or more antennas 108 and 208 of the wireless device are electrically coupled to the communication unit 110, the memory unit 130, and the additional components 140, and provide overall control for the operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 can transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0272] The additional component 140 may be configured in various ways depending on the type of wireless device. For example, the additional component 140 may include at least one of a power unit / battery, an input / output (I / O) unit, a driver, and a computing unit. The wireless device may be configured as, but not limited to: a robot ( Figure 20 100a), vehicles ( Figure 20 100b-1 and 100b-2), XR devices ( Figure 20 100c), handheld device ( Figure 20 100d), household appliances ( Figure 20 100e), IoT devices ( Figure 20 100f), digital broadcast terminal, hologram device, public safety device, MTC device, pharmaceutical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 20 400), BS( Figure 20 200), network nodes, etc. Depending on the use case / service, the wireless device can be mobile or fixed.

[0273] exist Figure 22In the wireless devices 100 and 200, all of the various elements, components, units / portions, and / or modules can be coupled to each other via a wired interface, or at least a portion of them can be wirelessly coupled to each other via the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 can be coupled via a wire, and the control unit 120 and the first unit (e.g., 130 and 140) can be wirelessly coupled via the communication unit 110. Each element, component, unit / portion, and / or module within the wireless devices 100 and 200 can further include one or more elements. For example, the control unit 120 can be configured as a collection of one or more processors. For example, the control unit 120 can be configured as a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. In another example, the memory unit 130 can be configured as a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0274] Figure 22 An implementation example of the present invention will be described in detail with reference to the accompanying drawings.

[0275] Figure 23 The diagram illustrates a portable device applicable to the present disclosure. Portable devices may include smartphones, smart tablets, wearable devices (e.g., smart watches and smart glasses), and portable computers (e.g., laptop computers). Portable devices may be referred to as mobile stations (MS), user terminals (UTs), mobile subscriber stations (MSSs), subscriber stations (SSs), advanced mobile stations (AMSs), or wireless terminals (WTs).

[0276] refer to Figure 23 , the portable device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a power supply unit 140a, an interface unit 140b, and an I / O unit 140c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to Figure 23 Frame 110 to 130 / 140.

[0277] The communication unit 110 can send signals (e.g., data and control signals) to another wireless device and a base station, and receive signals from another wireless device and a base station. The control unit 120 can perform various operations by controlling the components of the portable device 100. The control unit 120 may include an application processor (AP). The memory unit 130 can store data / parameters / programs / codes / commands required for the operation of the portable device 100. In addition, the memory unit 130 can store input / output data / information. The power supply unit 140a can supply power to the portable device 100 and includes a wired / wireless charging circuit and a battery. The interface unit 140b may include various ports for connecting to external devices (e.g., an audio I / O port and a video I / O port). The I / O unit 140c can obtain information / signals input by the user (e.g., touch, text, voice, image, and video) and store the obtained information / signals in the memory unit 130. The communication unit 110 can receive or output video information / signals, audio information / signals, data, and / or information input by the user. The I / O unit 140 c may include a camera, a microphone, a user input unit, a display 140 d , a speaker, and / or a haptic module.

[0278] For example, for data communication, the I / O unit 140c can acquire information / signals (e.g., touch, text, voice, image, and video) received from the user and store the acquired information / signals in the memory unit 130. The communication unit 110 can convert the information / signals into radio signals and transmit the radio signals directly to another device or BS. In addition, the communication unit 110 can receive radio signals from another device or BS and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the memory unit 130 and output in various forms (e.g., text, voice, image, video, and tactile effects) through the I / O unit 140c.

[0279] Figure 24 The diagram is applied to a vehicle or autonomous vehicle of the present disclosure. The vehicle or autonomous vehicle can be configured as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0280] refer to Figure 24 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Figure 22 Box 110 / 130 / 140.

[0281] The communication unit 110 can send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, base stations (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling components of the vehicle or autonomous vehicle 100. The control unit 120 may include an ECU. The drive unit 140a can enable the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a powertrain, wheels, brakes, a steering system, and the like. The power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include wired / wireless charging circuits, a battery, and the like. The sensor unit 140c can acquire vehicle status information, surrounding environment information, user information, and the like. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a positioning module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement the following technologies: a technology for maintaining the lane in which the vehicle is traveling; a technology for automatically adjusting the speed, such as adaptive cruise control; a technology for autonomously traveling along a determined path; a technology for traveling by automatically setting a path when a destination is set, etc.

[0282] For example, the communication unit 110 can receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d can generate an autonomous driving path and driving plan based on the obtained data. The control unit 120 can control the drive unit 140a so that the vehicle or autonomous driving vehicle 100 can move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can obtain recent traffic information data from the external server on an irregular / regular basis and can obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c can obtain vehicle status information and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving path and driving plan based on the newly obtained data / information. The communication unit 110 can transmit information about the vehicle's location, autonomous driving path, and / or driving plan to the external server. The external server can predict traffic information data based on information collected from the vehicle or autonomous driving vehicle using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0283] The above method is a combination of elements and features of the present disclosure. These elements or features can be considered to be optional unless otherwise stated. Each element or feature can be put into practice without being combined with other elements or features. In addition, the embodiments of the present disclosure can be constructed by combining a part of the elements and / or features. The order of operations described in the method of the present disclosure can be rearranged. Some configurations of any one method can be included in another method and can be replaced by the corresponding configuration of another method. It is obvious to those skilled in the art that claims that are not explicitly referenced to each other in the appended claims can be proposed as a combination of embodiments of the present disclosure, or can be included as new claims through subsequent amendments after submitting the application.

[0284] Industrial Applicability

[0285] The present disclosure is applicable to wireless communication devices such as user equipment (UE) and base station (BS) operating in various wireless communication systems including 3GPP LTE / LTE-A / 5G (or New RAT (NR)).

Claims

1. A method performed by a user equipment (UE), the method comprising the following steps: obtaining configuration information about WUS resources for a group wake-up signal WUS, the WUS resources including a first WUS resource and a second WUS resource, wherein the first WUS resource is configured to include a WUS resource available to a communication device that does not support the group WUS, and wherein the second WUS resource is configured to be immediately before the first WUS resource in terms of time; and receiving the set WUS based on the configuration information, wherein a WUS sequence for the group of WUS is determined based on a scrambling sequence, The initialization value for the scrambling sequence is determined based on the following formula: Among them, c g Indicates the WUS resource ID. Indicates the cell ID, n f_start_PO represents the initial frame of the initial paging occasion associated with the group WUS, n s_start_PO represents an initial time slot of the initial paging occasion associated with the group WUS, represents floor operation, and mod represents modular operation, Each of the first WUS resource and the second WUS resource is configured with one or more UE groups, and the WUS resource ID is different from the UE group ID, and The WUS resource ID has a first value of 0 for the first WUS resource and a second value of 1 for the second WUS resource. 2 . The method of claim 1 , further comprising monitoring a control channel for paging in a paging occasion related to the group WUS based on the group WUS.

3. The method according to claim 1, wherein The first WUS resource and the second WUS resource are associated with the same paging occasion.

4. The method according to claim 1, wherein The group WUS is a WUS identifiable for each of a plurality of device groups consisting of devices configured to monitor the same paging occasion.

5. A user equipment (UE), comprising: at least one processor; as well as at least one memory comprising instructions configured to, when executed by the at least one processor, perform operations comprising: obtaining configuration information about WUS resources for a group wake-up signal WUS, the WUS resources including a first WUS resource and a second WUS resource, wherein the first WUS resource is configured to include a WUS resource available to a communication device that does not support the group WUS, and wherein the second WUS resource is configured to be immediately before the first WUS resource in terms of time; and receiving the set WUS based on the configuration information, wherein a WUS sequence for the group of WUS is determined based on a scrambling sequence, The initialization value for the scrambling sequence is determined based on the following formula: Among them, c g Indicates the WUS resource ID. Indicates the cell ID, n f_start_PO represents the initial frame of the initial paging occasion associated with the group WUS, n s_start_PO represents an initial time slot of the initial paging occasion associated with the group WUS, represents floor operation, and mod represents modular operation, Each of the first WUS resource and the second WUS resource is configured with one or more UE groups, and the WUS resource ID is different from the UE group ID, and The WUS resource ID has a first value of 0 for the first WUS resource and a second value of 1 for the second WUS resource.

6. A method performed by a base station, the method comprising the following steps: transmitting configuration information about WUS resources for a group wake-up signal WUS, the WUS resources including a first WUS resource and a second WUS resource, wherein the first WUS resource is configured to include a WUS resource available to a communication device that does not support the group WUS, and wherein the second WUS resource is configured to be immediately before the first WUS resource in terms of time; and sending the group WUS based on the configuration information, wherein a WUS sequence for the group of WUS is determined based on the generated scrambling sequence, The initialization value for the scrambling sequence is determined based on the following formula: Among them, c g Indicates the WUS resource ID. Indicates the cell ID, n f_start_PO represents the initial frame of the initial paging occasion associated with the group WUS, n s_start_PO represents an initial time slot of the initial paging occasion associated with the group WUS, represents floor operation, and mod represents modular operation, Each of the first WUS resource and the second WUS resource is configured with one or more UE groups, and the WUS resource ID is different from the UE group ID, and The WUS resource ID has a first value of 0 for the first WUS resource and a second value of 1 for the second WUS resource. 7 . The method of claim 6 , further comprising transmitting a control channel for paging in a paging occasion related to the group WUS based on the group WUS.

8. The method according to claim 6, wherein: The first WUS resource and the second WUS resource are associated with the same paging occasion.

9. The method according to claim 6, wherein: The group WUS is a WUS identifiable for each of a plurality of device groups consisting of devices configured to monitor the same paging occasion.

10. A base station, comprising: at least one processor; at least one radio frequency (RF) transceiver; as well as at least one memory comprising instructions configured to, when executed by the at least one processor, implement operations by controlling the at least one RF transceiver, The operations include: transmitting configuration information about WUS resources for a group wake-up signal WUS, the WUS resources including a first WUS resource and a second WUS resource, wherein the first WUS resource is configured to include a WUS resource available to a communication device that does not support the group WUS, and wherein the second WUS resource is configured to be immediately before the first WUS resource in terms of time; and sending the group WUS based on the configuration information, wherein a WUS sequence for the group of WUS is determined based on the generated scrambling sequence, The initialization value for the scrambling sequence is determined based on the following formula: Among them, c g Indicates the WUS resource ID. Indicates the cell ID, n f_start_PO represents the initial frame of the initial paging occasion associated with the group WUS, n s_start_PO represents an initial time slot of the initial paging occasion associated with the group WUS, represents floor operation, and mod represents modular operation, Each of the first WUS resource and the second WUS resource is configured with one or more UE groups, and the WUS resource ID is different from the UE group ID, and The WUS resource ID has a first value of 0 for the first WUS resource and a second value of 1 for the second WUS resource.

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