Method and apparatus for setting NES mode in wireless communication system

Abstract

A method and apparatus for setting a network energy saving (NES) mode in a wireless communication system disclosed in the specification includes: performing an operation of a search space set group (SSSG) handover based on a SSG handover flag field; and switching operation of the NES mode based on the SSSG switching.

Description

Technical Field

[0001] The present disclosure relates to a method and an apparatus for use in a wireless communication system. Background Art

[0002] In general, wireless communication systems are being developed to diversely cover a wide range to provide communication services such as audio communication services, data communication services, etc. Wireless communication is a multiple access system capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, the multiple access system may include one of a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (SC-FDMA) system, and the like. Summary of the invention

[0003] Technical issues

[0004] An object of the present disclosure is to provide a method and apparatus for effectively performing power saving in a wireless communication system.

[0005] Those skilled in the art will understand that the objectives that can be achieved by the present disclosure are not limited to the contents that have been specifically described above, and the above and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] The present disclosure provides a method and apparatus for configuring a network energy saving (NES) mode in a wireless communication system.

[0008] In one aspect of the present disclosure, provided herein is a method for configuring an NES mode by a user equipment (UE) in a wireless communication system. The method includes: receiving downlink control information (DCI) including a search space set group (SSSG) switching flag field; performing SSSG switching based on the value of the SSSG switching flag field, wherein physical downlink control channel (PDCCH) monitoring according to a search space set with a first group index is started, and PDCCH monitoring according to a search space set with a second group index is stopped; and based on the SSSG switching, performing switching from a second NES mode associated with the search space set with the second group index to a first NES mode associated with the search space set with the first group index.

[0009] In another aspect of the present disclosure, provided herein is a device, a processor, and a storage medium for executing a NES mode configuration method.

[0010] The apparatus may include an autonomous driving vehicle communicable with at least a UE, a network, and with another autonomous driving vehicle other than the communication apparatus.

[0011] The above-mentioned aspects of the present disclosure are only some preferred embodiments of the present disclosure, and those skilled in the art can derive and understand various embodiments reflecting the technical features of the present disclosure from the following detailed description of the present disclosure.

[0012] Beneficial Effects

[0013] According to an embodiment of the present disclosure, more efficient power saving may be achieved based on configuration of a network energy saving (NES) mode in a wireless communication system.

[0014] Those skilled in the art will understand that the technical effects that can be achieved by the present disclosure are not limited to the technical effects specifically disclosed above, and other technical effects of the present disclosure can be more clearly understood from the detailed description below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The radio frame structure is shown.

[0016] Figure 2 The resource grid during the duration of a time slot is illustrated.

[0017] Figure 3 Figure 1 shows a self-contained time slot structure.

[0018] Figure 4 is a diagram illustrating a method for transmitting / receiving a signal according to an embodiment of the present disclosure.

[0019] Figures 5 to 8 A device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0020] The following technologies may be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wireless Fidelity (WiFi)), IEEE 802.16 (Worldwide Interoperability for Microwave Access (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 a part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-advanced (LTE-A) is an evolution of 3GPP LTE. 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE / LTE-A.

[0021] For clarity of description, the present disclosure will be described in the context of 3GPP communication systems (e.g., LTE and NR), which should not be construed as limiting the spirit of the present disclosure. LTE refers to technology beyond 3GPP TS 36.xxx version 8. Specifically, LTE technology beyond 3GPP TS 36.xxx version 10 is called LTE-A, and LTE technology beyond 3GPP TS 36.xxx version 13 is called LTE-A pro. 3GPP NR is a technology beyond 3GPP TS 38.xxx version 15. LTE / NR may be referred to as a 3GPP system. "xxx" specifies a technical specification number. LTE / NR may be collectively referred to as a 3GPP system. Background technology, terms, abbreviations, etc. as used herein refer to technical specifications published prior to the present disclosure. For example, the following documents may be referenced.

[0022] 3GPP NR

[0023] -38.211: Physical channels and modulation

[0024] -38.212: Multiplexing and channel coding

[0025] -38.213: Physical layer procedures for control

[0026] -38.214: Physical layer procedures for data

[0027] -38.300: NR and NG-RAN general description

[0028] -38.331: Radio Resource Control (RRC) Protocol Specification

[0029] Figure 1 The radio frame structure for NR is shown.

[0030] In NR, UL and DL transmissions are configured on a frame basis. Each radio frame has a length of 10ms and is divided into two 5ms half-frames. Each half-frame is divided into five 1ms subframes. A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (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 may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or discrete Fourier transform-extended-OFDM (DFT-s-OFDM) symbols).

[0031] Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS in the normal CP case.

[0032] [Table 1]

[0033]

[0034] *N slot symb : The number of symbols in a time slot

[0035] *N frame, u slot : Number of time slots in a frame

[0036] *N subframe, u slot : Number of time slots in a subframe

[0037] Table 2 shows 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.

[0038] [Table 2]

[0039]

[0040] In the NR system, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) may be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., a subframe, a time slot, or a transmission time interval (TTI)) consisting of the same number of symbols (referred to as a time unit (TU) for convenience) may be configured differently between the aggregated cells.

[0041] In NR, various parameter sets (or SCS) can be supported to support various 5th generation (5G) services. For example, with an SCS of 15kHz, wide areas in the traditional cellular band can be supported, while with an SCS of 30kHz or 60kHz, dense urban areas, lower latency, and wide carrier bandwidth can be supported. For an SCS of 60kHz or higher, bandwidths greater than 24.25kHz can be supported to overcome phase noise.

[0042] The NR frequency band can be defined by two types of frequency ranges FR1 and FR2. FR1 and FR2 can be configured as described in Table 3 below. FR2 can be millimeter wave (mmW).

[0043] [Table 3]

[0044]

[0045] Figure 2 The resource grid during the duration of one time slot is shown.

[0046] 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. A resource block (RB) can be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interleavings (referred to as interleavings) can be defined in the frequency domain. Interleaving m∈{0,1,…, M-1} can be composed of (common) RBs {m, M+m, 2M+m, 3M+m,…}. M represents the number of interleavings. A bandwidth part (BWP) can be defined by multiple consecutive (physical) RBs ((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., five) BWPs. Data communication can be performed in an active BWP, and only one BWP can be enabled for a UE. Each element in a resource grid can be referred to as a resource element (RE), to which a complex symbol can be mapped.

[0047] In a wireless communication system, a UE receives information from a BS in a downlink (DL), and the UE transmits information to the BS in an uplink (UL). Information exchanged between the BS and the UE includes data and various control information, and there are various physical channels / signals according to the type / purpose of the information exchanged therebetween. A physical channel corresponds to a set of resource elements (REs) that carry information originating from a higher layer. A physical signal corresponds to a set of REs that are used by the physical layer but do not carry information originating from a higher layer. The higher layer includes a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and the like.

[0048] DL physical channels include physical broadcast channel (PBCH), physical downlink shared channel (PDSCH) and physical downlink control channel (PDCCH). DL physical signals include DL reference signal (RS), primary synchronization signal (PSS) and secondary synchronization signal (SSS). DL RS includes demodulation reference signal (DM-RS), phase tracking reference signal (PT-RS) and channel state information reference signal (CSI-RS). UL physical channels include physical random access channel (PRACH), physical uplink shared channel (PUSCH) and physical uplink control channel (PUCCH). UL physical signals include UL RS. UL RS includes DM-RS, PT-RS and sounding reference signal (SRS).

[0049] Figure 3 Figure 1 shows the structure of a self-contained time slot.

[0050] In the NR system, a frame has a self-contained structure in which a DL control channel, DL or UL data, a UL control channel, etc. can all be included in one time slot. For example, the first N symbols in the time slot (hereinafter, the DL control region) can be used to send a DL control channel, and the last M symbols in the time slot (hereinafter, the UL control region) can be used to send a UL control channel. N and M are integers greater than or equal to 0. The resource region (hereinafter, the data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. For example, the following configuration can be considered. The various parts are listed in chronological order.

[0051] In the present disclosure, a base station (BS) may be, for example, a gNodeB (gNB).

[0052] Switching of Network Energy Saving (NES) mode.

[0053] The above content can be applied in combination with the methods proposed in the present disclosure, which will be described later. Alternatively, the content can illustrate the technical features of the methods proposed in the present disclosure.

[0054] In addition, the following methods can also be applied to the above-mentioned NR system (licensed band) or shared spectrum. Therefore, it is obvious that the terms, expressions and structures in this document can be modified to be suitable for the system so as to implement the technical ideas of the present disclosure in the corresponding system.

[0055] New technologies and operation methods may be discussed in the future to improve energy saving capabilities from the perspective of transmission and reception at the BS. The following is the rationale for the study items approved in Release 18 for this purpose.

[0056] [Table 4]

[0057]

[0058]

[0059] The present disclosure proposes techniques and configuration / operation methods that can be introduced for energy saving at a BS.

[0060] In order to save energy at the BS, a network energy saving (NES) mode (i.e., a mode for saving energy at the BS) may be defined. A BS operating in the NES mode may reduce its power consumption by suspending (maintaining) DL or UL transmission during a specific period or limiting transmission and reception operations in a specific frequency band. In the present disclosure, the NES mode may refer to an operation mode of a BS and / or UE defined / configured / indicated for such a purpose. Additionally, in the present disclosure, an operation mode of a UE (or a cell) that is not configured with the NES mode (or a configuration based on the NES) is referred to as a non-NES mode to distinguish the operation mode from the NES mode.

[0061] The NES mode may be maintained for only a specific period of time. In a proposal described later, the period of time during which the BS operates in the NES mode is referred to as the NES duration. The NES mode may be valid only for specific frequency resources. In a proposal described later, the frequency resources corresponding to the NES mode are referred to as NES bands.

[0062] The NES mode may be configured by the BS through separate higher layer signaling or higher layer configuration. Alternatively, the NES mode may be dynamically configured to the BS / UE through other control channels (e.g., based on DCI indications) or data channels (e.g., PDSCH, PUSCH). During the NES mode, the BS may turn on / off specific times, frequencies, antenna resources, etc., and may not send / receive related data channels, control channels, or control signals. During the NES mode, the UE may operate by anticipating that specific times / frequencies / antenna resources will be turned on / off and related channels / signals will not be sent.

[0063] A BWP for NES mode (NES-BWP) may be defined / configured for a UE for which NES mode has been defined / configured. The NES-BWP may be set as a separate BWP that operates only in NES mode. In this case, the BWP for non-NES mode may not be defined or deactivated. Alternatively, a specific (single) BWP may be configured differently for NES mode and non-NES mode. For example, a specific BWP may be set to a NES-BWP during an NES duration and to a different BWP during other durations. The configuration method and constraints of the NES-BWP may be defined / configured separately from the conventional BWP. For example, in the NES-BWP, PDCCH monitoring may not be performed, but non-periodic CSI-RS signals and reports may be configured. As another example, the periodicity of the periodic CSI-RS may be reinterpreted in the NES-BWP.

[0064] Unique BWP switching operations in NES mode can be defined. For example, in conventional BWP switching configuration / operation, when a BWP other than the default BWP is the active BWP, a timer is set. If the timer expires, the current active BWP is switched to inactive and the default BWP is restored as the new active BWP. On the other hand, in NES mode, if the timer expires, the current active BWP can be switched to inactive and the dormant BWP or NES-BWP can be switched to the new active BWP. Alternatively, if the timer expires, the current active BWP can be switched to inactive and the default BWP can be switched to the new active BWP (as in conventional operation). If DL / UL transmission is not scheduled / configured in the default BWP for a certain period of time, the default BWP can be switched to inactive and the dormant BWP or NES-BWP can be switched to the new active BWP.

[0065] The proposed methods described later can be applied independently under the conditions described for each method or configured only during the NES duration. Alternatively, these methods can be applied only in the NES band.

[0066] In the proposed method described later, operating in non-NES mode means any NR configuration / operation that is not configured for NES (e.g., a configuration / operation specified in a Release 15, Release 16, or Release 17 NR specification). In the proposed method described later, operation switched to NES mode may only apply to UEs / cells configured for NES. Additionally, NES mode is not limited to a specific configuration or operation method. That is, NES mode may be any configuration or operation method defined / configured for NES. In the proposed method described later, switching to NES mode may also be understood as switching to NES-BWP.

[0067] Table 5 shows a search space set group (SSSG) switching and a PDCCH skipping operation extracted from 3GPP TS 38.213 V17.2.0. Table 6 shows the minimum value of P_switch in Table 10.4-1 of 3GPP TS 38.213 V17.2.0. Specifically, Table 6 shows the minimum value of P_switch in symbol units.

[0068] [Table 5]

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077] [Table 6]

[0078]

[0079] The two operations capable of adjusting the PDCCH monitoring of the UE can be extended / modified and applied for the purpose of controlling the energy consumption of the BS. The method [1-1] described later is a method for extending / modifying the SSSG switching operation for the NES mode, which can be easily applied to the non-periodic switching between the NES mode and the non-NES mode. However, the application of the proposed method is not limited to these cases. The method [1-2] described later is a method for extending / modifying the PDCCH skipping operation for the NES mode, which can be easily applied to the periodic switching between the NES mode and the non-NES mode. However, the application of the proposed method is not limited to these cases.

[0080] In the proposed method described later, the NES mode (NES operation or NES configuration) is not limited to the value / method for configuring a specific parameter or a specific operation. The NES mode may refer to a parameter configured to reduce the power of the BS or an operation of the BS / UE defined to reduce the power of the BS. For example, for a cell (or UE) configured with the NES mode, the BS may not transmit a channel / signal such as an SSB during a specific period. Alternatively, the periodicity configured for the NES mode may be defined via RRC signaling as being longer than the periodicity configured for the non-NES mode. As another example, when the NES mode is configured, the default BWP of the cell may be changed to a specific BWP (for NES purposes).

[0081] In the proposed method described later, the expression "specific parameters (or operations) are configured" may be understood to mean that parameters (or operations) are configured for any cell, for a specific UE, for a configured cell for a specific UE, for a configured DL (or UL) BWP for a specific cell, or for an active DL (or UL) BWP for a specific cell.

[0082] In the proposed method described later, MAC CE or DCI (for example, indicating a group index or activating / deactivating a specific operation) can be transmitted in a UE-specific, UE group common, or cell-specific manner. DCI may be scrambled with an RNTI configured in a UE-specific, UE group common, or cell-specific manner and then transmitted. MAC CE may be transmitted through a PDSCH scheduled by DCI scrambled with an RNTI configured in a UE-specific, UE group common, or cell-specific manner.

[0083] SSSG switching and PDCCH skipping have been introduced in NR as methods for reducing the power consumption caused by PDCCH monitoring of UEs. SSSG switching involves grouping multiple SS sets by different configuration values ​​and changing the PDCCH monitoring periodicity of the UE based on switching between the groups. PDCCH skipping involves skipping the monitoring operation of the UE within a certain period (based on switching between SS set groups in a similar manner).

[0084] [1] Use the SSSG switch to switch to NES mode (or non-NES mode)

[0085] For SSSG switching, some (or specific) SSSGs configured for the UE may be configured for NES mode, whereas other (or different specific) SSSGs may be configured for non-NES mode. Switching between NES mode and non-NES mode may be indicated by SSSG switching between SSSGs for different modes. For example, the start of NES mode or the end of NES mode may be indicated by SSSG switching.

[0086] As a specific example, an SSSG switching operation is configured for the UE, and the switching between SSSG#0 and SSSG#1 can be configured. SSSG#0 is configured as a set of SS sets configured in the DL BWP for non-NES mode. SSSG#1 is configured as a set of SS sets configured in the NES-BWP for NES mode. The switching from non-NES mode to NES mode can be indicated by a switching operation between SSSG#0 and SSSG#1 (e.g., SSSG#0→SSSG#1 switching). Additionally, the switching from NES mode to non-NES mode can also be indicated by a switching operation between SSSG#0 and SSSG#1 (e.g., SSSG#1→SSSG#0 switching). For the mechanism, trigger condition and / or related parameter configuration value (e.g., P_switch) for SSSG switching, the method in Table 4 can be used. Alternatively, for a UE configured with NES mode, a switching mechanism, trigger condition and / or related parameter configuration value different from those in Table 4 can be used.

[0087] SSSG switching can also be triggered by the following method. For UEs configured with NES mode, the "search space set group switching flag" in DCI format 2_0 can indicate the SSSG index to be switched, and at the same time, SSSG switching can be triggered (similar to conventional SSSG switching). As another method, separate flags and / or indicators can be defined in DCI format 2_0. Each flag and / or indicator can consist of 1 bit or more than 2 bits. Separately defined flags and / or indicators can trigger switching to NES mode and indicate the SSSG to be switched. Alternatively, a separate group common DCI can be used. In this case, the trigger point can be the reception time of the DCI. As a specific example, the trigger point can be the last symbol of the PDCCH containing the DCI. At the same time, when the UE switches from non-NES mode to NES mode (or vice versa), a separate timer can be configured (set). The timer value (non-zero integer) can be configured by RRC signaling. The timer value can be reduced in time slot units, and when the timer value reaches 0, the SSSG switch can be triggered. Alternatively, SSSG switching may be triggered at the end point of the NES mode (or non-NES mode). In this case, the end point of the NES mode (or non-NES mode) may refer to the last symbol of the time period corresponding to the NES mode (or non-NES mode). The time period corresponding to the NES mode (or non-NES mode) may be predefined or configured via RRC signaling. Alternatively, the time period corresponding to the NES mode (or non-NES mode) may be configured by a separate specific process. Alternatively, the time period corresponding to the NES mode (or non-NES mode) may be indicated and / or configured by triggering a DCI to switch to the NES mode (or non-NES mode) via SSSG switching.

[0088] SSSG switching can be applied after "a certain time (P_switch)" from the trigger point. After the SSSG switching is triggered, the UE can switch to NES mode (or non-NES mode) starting from the start of the earliest time slot in the time domain after a separately configured or predefined P_switch number of symbols. Alternatively, the exact time point for switching to NES mode can be explicitly indicated and / or configured by the DCI that triggers the SSSG switching. The time point for switching to NES mode can be indicated relative to a trigger point such as "the earliest time slot after X symbols from the trigger point". The time point for switching to NES mode can also be indicated by a value based on SFN (or time slot index). The latter method can be useful when multiple UEs are instructed to switch to NES mode at the same time.

[0089] SSSG switching can be configured to switch between SSSGs in different BWPs. For example, if up to two SSSGs are configured for each BWP, and two SSSGs are configured for BWPs for non-NES mode and two SSSGs are configured for BWPs for NES mode, then SSSG switching can be configured to switch between four SSSGs.

[0090] On the other hand, energy saving of BS can be applied in various forms. For example, the number of times data or control signals / channels are sent to / received from UE can be reduced within a certain period of time. Alternatively, UE may not perform transmission / reception within a certain period of time. Additionally, the energy consumed by BS can be reduced by not using specific frequency resources within a certain period of time. Alternatively, the rank and / or layer of the data transmission channel can be reduced. The power of the data transmission channel can also be reduced. Periodic / non-periodic signal transmission may be restricted. Each of these modes can be referred to as NES mode in time domain, NES mode in frequency domain, NES mode for space domain, NES mode for power domain, etc. For convenience of explanation, each mode can be represented as NES mode #k, where k=1, 2, ..., N. In this case, NES mode #k can be understood as a specific configuration method (for NES purposes).

[0091] - The aforementioned SSSG switching may be a method for indicating and / or configuring switching between a specific SSSG corresponding to non-NES mode operation and another specific SSSG corresponding to NES mode operation. However, a method for distinguishing a specific configuration method for NES (i.e., a specific NES mode) and indicating switching to NES mode #k may be used. The specific configuration method (or specific NES mode) for NES may be predefined or configured via RRC signaling. In this case, a different SSSG index is assigned for each NES configuration method (or depending on a specific NES mode). When the SSSG index is indicated by a DCI that triggers SSSG switching, a specific NES configuration method (or NES mode #k) may be applied. For example, SSSG #0 may be mapped to non-NES mode, SSSG #1 may be mapped to NES mode #1, and SSSG #2 may be mapped to NES mode #2. During SSSG switching, a specific SSSG index may be indicated by DCI. The methods listed below may be used to perform switching between N NES modes via SSSG switching. However, the application of these methods is not limited to specific situations, and these methods may be used more generally.

[0092] - As a method for this, SSSG switching and BWP switching may be jointly indicated. That is, an index combination (n, k) may be indicated simultaneously with the SSSG switching trigger so that switching to the kth SSSG configured in the nth BWP may be performed by SSSG switching. For example, the SSSG may be switched from SSSG#1 configured in BWP#1 to SSSG#2 configured in BWP#2 or to SSSG#3 configured in BWP#3.

[0093] - As another method, up to N SSSGs may be configured in a single NES-BWP. Alternatively, for UEs / cells configured with NES mode, up to N SSSGs may be configured in some BWPs. In this case, N may be predefined or set via RRC signaling. In order to indicate one of the N SSSGs by SSSG switching, the DCI triggering the SSSG switching may include ceil{log2(N)} bits. In this case, the aforementioned SSSG switching operation may be used to switch between a specific SSSG (e.g., SSSG#0) and another specific SSSG (e.g., SSSG#1) or the SSSG switching operation may be used to switch between a specific SSSG (e.g., SSSG#0) and multiple specific SSSGs (e.g., {SSSG#1, SSSG#2, ..., SSSG#N}). In the latter case, for example, SSSG#1, SSSG#2, ..., SSSG#N may be mapped to N different NES configuration methods (or NES mode #k).

[0094] - As another method, one of the two SSSGs configured in the BWP may be defined as the SSSG for NES mode (NES-SSSG). The NES mode (or specific configuration value / method) to be applied when switching to NES-SSSG based on SSSG switching may be configured via RRC signaling. Therefore, the number of SSSGs configured per BWP may still be a maximum of 2, while more NES modes (e.g., more than two modes) may be used through SSSG switching. In this case, the DCI triggering SSSG switching may include a 1-bit field.

[0095] In the SSSG switching operation, when the RRC parameter "cellGroupsForSwitchList" is configured, multiple cells are grouped, and the SSSG switching can occur simultaneously for all cells within the group. The cell group concept can also be applied to the SSSG switching operation for switching to NES mode. When a different NES configuration method (or NES mode #k) is assigned to each cell group, the value of k that distinguishes the cell groups can be indicated together with the SSSG switching. Therefore, the SSSG switching can be triggered only for the cell group corresponding to the indicated k value. For this purpose, for each cell configured for the UE, a separate cell group can be configured for different NES modes. Therefore, a single cell can belong to multiple cell groups. For example, for a UE configured with three cells, if cell #1 is configured for the cell group for both NES mode #1 and NES mode #2, cell #2 is configured only for NES mode #1, and cell #3 is configured only for NES mode #2, the cell group for NES mode #1 may be {cell #1, cell #2}, and the cell group for NES mode #2 may be {cell #1, cell #3}. In this case, if the SSSG switching indicates mode #1 and is triggered from cell #1 or cell #2, {cell #1, cell #2} may be switched to NES mode #1 at the same time. If the SSSG switching indicates mode #2 and is triggered from cell #1 or cell #3, {cell #1, cell #3} may be switched to NES mode #2 at the same time.

[0096] Additionally, the parameter configuration method related to SSSG switching may be the same as those defined in Table 5. When the NES mode (or equivalent operation mode) is configured for the UE, the configuration values ​​for some / specific SSSGs (and / or SS sets in the corresponding SSSGs) may be reinterpreted for NES purposes. For example, when NES-related operations are not configured for UEs configured with SSSG#0 and SSSG#1, the configuration values ​​for each SSSG (or SS sets in the corresponding SSSGs) may be configured by RRC (without any changes). However, if NES-related operations are configured for the UE, the configuration values ​​for each SSSG (or SS sets in the corresponding SSSGs) may be applied differently from the originally configured values. As an example thereof, assuming that the periodicity of the SS sets included in SSSG#1 is set to 16 time slots, when NES operations are configured for the UE, the periodicity of the SS sets in SSSG#1 may be applied to be greater than 16 time slots (e.g., scaled by a factor of N). Therefore, without separate signaling for changing the configuration value of the SS set configured for the non-NES mode, the operation of the BS and the UE in the NES mode may be configured differently from the non-NES mode.

[0097] Additionally, in conventional non-NES mode, the configuration of type-3 CSS and / or USS (e.g., SearchSpace configuration value) can be changed through SSSG switching. However, the configuration values ​​of other types of SS sets (e.g., type 0 CSS, type 1 CSS) will not change. The above-mentioned SSSG switching for NES mode can be operated to change the configuration values ​​for any type of SS set. For example, as mentioned above, when the UE switches to NES mode through SSSG switching, the configuration values ​​for type-0 / 0A / 1 / 2 CSS can be changed differently for each SSSG. Once the NES mode is initiated through SSSG switching, both the BS and the UE can operate with configuration values ​​different from those in the non-NES mode to send and receive the relevant CSS and its PDCCH.

[0098] The proposed method for SSSG switching can also be applied by PDCCH monitoring adaptation to be described in the following method [2]. In this case, the index of the SS set group is configured via a separate RRC signaling (e.g., searchSpaceGroupIdList), and the group index can be indicated by a separate DCI field (e.g., the PDCCH adaptation field introduced in DCI 0_1, 0_2, 1_1 and 1_2 in NR Release 17).

[0099] [2] Use PDCCH monitoring skipping / adaptation to switch to NES mode (or non-NES mode).

[0100] The PDCCH skipping and PDCCH monitoring adaptation fields introduced in NR version 17 for UE power saving can be used to switch to NES mode. The PDCCH monitoring adaptation field can also be expressed as a PDCCH monitoring adaptation indication field. As specified in Table 5, the PDCCH skipping duration value set and the SS set group index are configured by RRC parameters such as PDCCH SkippingDurationList and / or searchSpaceGroupIdList. The DCI format 0_1, 0_2, 1_1 or 1_2 sent to the UE includes a 1-bit or 2-bit PDCCH monitoring adaptation field. The skipping configuration or SSSG switching configuration for a specific PDCCH is indicated by this field. Specifically, the UE is configured with an SS set group index for a type-3 CSS or USS set via the searchSpaceGroupIdList. The UE receives the corresponding SS set group index through the PDCCH monitoring adaptation field in the DCI and performs a PDCCH monitoring operation based on the value / operation configured for the group.

[0101] When the UE is configured with NES operation, the UE may be configured and / or instructed to switch to NES mode (or non-NES mode) via RRC parameters. In this case, the method proposed in subsection [1] may be applied in the same manner. For example, among the SSSGs configured for the UE, some (or specific) SSSGs may be configured for NES mode, whereas other (or different specific) SSSGs may be configured for non-NES mode.

[0102] For example, if the indices of three SSSGs are configured via RRC signaling (e.g., searchSpaceGroupIdList) and if a specific SSSG is indicated by the PDCCH monitoring adaptation field in the DCI, the UE can operate in a manner similar to the SSSG switching described in subsection [1]. In this case, in order to switch the UE to NES mode, the SSSG configured for NES mode can be indicated.

[0103] As another example, among the skip durations configured for the UE, some (or specific) durations may be configured for NES mode, whereas other (or different specific) durations may be configured for non-NES mode. When a specific duration is indicated via the PDCCH monitoring adaptation indication field in the DCI, the UE may operate in a manner similar to the SSSG switching described in subsection [1]. In this case, in order to switch the UE to NES mode, a duration mapped to the NES mode may be indicated.

[0104] Multiple UEs (or cell-specific UEs) may be configured and / or indicated to switch to NES mode via the PDCCH monitoring adaptation field. A list of multiple group indices containing SS set groups configured for NES mode is configured via cell-specific RRC signaling. Subsequently, the group index may be indicated by a group-common DCI. A UE configured with NES operation may receive a group index associated with a specific NES mode via a group-common DCI among the groups defined by RRC signaling. The UE may switch to the corresponding NES mode and operate in the corresponding NES mode. The group-common (GC) DCI may use the GC-DCI (e.g., DCI format 2_0) supported in Release 17 NR, or a separate GC-DCI may be defined. In this case, a separate DCI field may be used to indicate the group index. When the number of groups configured by RRC is (at most) N, the bit width of the DCI field may be (at most) ceil{log2(N)}.

[0105] Multiple UEs (or cell-specific UEs) may be configured and / or indicated to skip switching to NES mode via PDCCH. That is, multiple durations are configured via cell-specific RRC signaling. Subsequently, a specific duration among the multiple durations may be indicated via GC-DCI. A UE configured with NES operation may receive a duration associated with a specific NES mode according to GC-DCI among multiple durations configured via RRC signaling. The UE may switch to the corresponding NES mode and operate in the corresponding NES mode. The aforementioned GC-DCI may use the GC-DCI supported in Release 17 NR (e.g., DCI format 2_0), or a separate GC-DCI may be defined. In this case, a separate DCI field may be used to indicate the duration. When the number of durations configured by RRC is (at most) M, the bit width of the DCI field may be (at most) ceil{log2(M)}.

[0106] Alternatively, when PDCCH skipping is configured for a UE configured with NES operation (NES mode), the UE may operate in NES mode only when the configured PDCCH skipping duration value is above a predetermined threshold. Otherwise, the UE may operate in non-NES mode.

[0107] For example, a threshold value K may be configured via RRC signaling. When the UE is operating in a non-NES mode (or NES mode), if the value of the configured / indicated PDCCH skip duration is less than (or greater than) K, the UE may maintain the non-NES mode (or NES mode) and perform the configured / indicated PDCCH skip. If the value of the configured / indicated duration is greater than (or less than) K, the UE may switch to the NES mode (or non-NES mode). In this case, the configured / indicated skip duration may be determined as the duration during which the NES mode is maintained. Alternatively, a specific offset value may be added to the configured skip duration, or a specific scaling value may be multiplied to determine the duration for the NES mode. Alternatively, the duration for which the NES mode is maintained may be predefined. In this case, after the duration has passed, the UE may switch back to the non-NES mode (without a separate indication). For example, if a skip duration greater than the threshold value K is indicated to a UE operating in a non-NES mode, the UE may switch to the NES mode. In this case, once the duration has passed, the UE may return to the non-NES mode. Additionally, the operation of switching to the NES mode during the skip duration may be applicable only to a specific cell (or BWP) or a specific frequency resource (eg, a specific range of RBs).

[0108] [3] Method for handling scheduled PDSCH / PUSCH and / or configured PDSCH / PUSCH when the BS / UE switches to NES mode or when switching to NES mode is instructed

[0109] A BS / UE operating in NES mode can be configured in various ways. For example, a BS / UE operating in NES mode may not transmit (or receive) PDSCH (or PUSCH). When NES mode is configured by a specific configuration (or process) including the aforementioned switching operation to NES mode (or when the BS / UE switches to NES mode), PDSCH reception (or PUSCH transmission) may have been scheduled to the UE or configured by a higher layer. Channels / signals such as PDSCH / PUSCH may be handled by one of the following methods.

[0110] Method [3-1]: When the DCI received via scheduled PDSCH (or sent via PUSCH) configures / indicates NES mode to the UE, the UE may switch to NES mode immediately after receiving the scheduled PDSCH (or sending the scheduled PDSCH). In this case, the UE / BS may not send or expect HARQ feedback for PDSCH (or PUSCH).

[0111] Method [3-2]: When the DCI received via the scheduled PDSCH (or sent via the PUSCH) configures / indicates the NES mode to the UE, the UE may switch to the NES mode after receiving the scheduled PDSCH (or sending the scheduled PDSCH) and waiting for a specific time (T1). In this case, the UE / BS may not send or expect HARQ feedback for the PDSCH (or PUSCH). Alternatively, regardless of whether the HARQ feedback for the PDSCH (or PUSCH) is ACK or NACK, the UE may switch to the NES mode after T1.

[0112] Method [3-3]: When the NES mode is configured / indicated to the UE via DCI for scheduling PDSCH reception (or PUSCH transmission), the UE may switch to the NES mode after receiving the scheduled PDSCH (or sending the scheduled PDSCH) and sending HARQ feedback for the PDSCH (or PUSCH) (if the HARQ feedback is ACK). If the PDSCH (or PUSCH) is not successfully transmitted / received or decoded, resulting in NACK, the PDSCH (or PUSCH) may be retransmitted. Once the HARQ feedback is ACK, the UE may switch to the NES mode.

[0113] Method [3-4]: When the NES mode is configured / indicated to the UE via DCI for scheduled PDSCH reception (or PUSCH transmission), the UE may switch to the NES mode after receiving the scheduled PDSCH (or sending the scheduled PUSCH) and sending the HARQ feedback as ACK, or the UE may switch to the NES mode after receiving the scheduled PDSCH (or sending the scheduled PUSCH) and waiting for a specific time (T2). That is, the PDSCH (or PUSCH) may be retransmitted until the HARQ feedback for it is ACK. Once the ACK is sent, the UE may switch to the NES mode immediately after sending the ACK, or the UE may switch to the NES mode after waiting for a specific time (T3) immediately after the ACK is sent. If the HARQ feedback is not ACK within T2, the UE may switch to the NES mode (without retransmitting) after T2 from the initial reception of the PDSCH (or the initial transmission of the PUSCH).

[0114] Even before switching to NES mode is configured / indicated, the above method [3-1], [3-2], [3-3] or [3-4] may be applied to a PDSCH (or PUSCH) scheduled by other DCI or configured via a higher layer.

[0115] After the UE is configured / instructed to switch to NES mode, the UE may drop / ignore PDSCH reception (or PUSCH transmission) scheduled by a separate DCI.

[0116] When the UE is instructed to switch to NES mode, the signals / channels used for CSI reporting and measurement in the form of periodic, semi-persistent and / or aperiodic configurations that have been configured for the UE may be immediately deactivated (suspended or released). These signals / channels may include CSI-RS, SRS, data channels (e.g., SPS-PDSCH), etc. The UE may switch to NES mode after deactivation. Alternatively, after a specific time (T4) from receiving the configuration / indication, the signal / channel may be deactivated and the UE may switch to NES mode.

[0117] In the above method, T1, T2, T3 and T4 may be predefined as absolute time values ​​(e.g., in milliseconds) or configured through RRC signaling. Alternatively, T1, T2, T3 and T4 may be predefined as a specific number of time slots and / or symbols or configured through RRC signaling. When multiple NES modes are configured, these values ​​may be configured separately for each NES mode. Alternatively, a separate timer (or counter) may be used for each of T1, T2, T3 and T4.

[0118] The "scheduled PDSCH / PUSCH and / or configured PDSCH / PUSCH handling methods" proposed in subsection [3] can be configured / applied independently of the method of switching to NES mode. For example, these methods can be specifically applied to the NES mode switching method through the SSSG switching and / or PDCCH monitoring skipping / adaptation proposed in subsections [1] and / or [2].

[0119] The "scheduled PDSCH / PUSCH and / or configured PDSCH / PUSCH handling method" proposed in subsection [3] can be selectively configured / applied only to specific control / data channels. For example, when switching to NES mode based on the PDCCH monitoring adaptation method proposed in subsection [2], in addition to PDCCH monitoring, a series of DL receptions (for example, DL signals / channels sent in P / SP form, such as CSI-RS, SPS PDSCH, etc.) can be configured to be skipped. As another example, when switching to NES mode based on the PDCCH skipping method proposed in subsection [2], a series of DL receptions including PDCCH monitoring (for example, DL signals / channels sent in P / SP form, such as CSI-RS, SPS PDSCH, etc.) can be configured to be skipped.

[0120] [4] A method for applying different configurations for the proposed method based on discontinuous reception (DRX) configuration

[0121] NR (eg, Release 17) standards specify DRX configuration / operation. Features of DRX for reducing unnecessary power consumption for UEs are as follows.

[0122] DRX defines two structures: one for UEs in RRC_IDLE state (referred to as I-DRX) and another for UEs in RRC_CONNECTED state (referred to as C-DRX). The two DRX structures are defined so that the period (e.g., active period or on-duration period) during which the UE can expect to receive DL signals occurs periodically to reduce unnecessary power consumption during other periods. For reference, in the case of C-DRX, the start of the on-duration period occurs periodically. The size of the configurable period (i.e., DRX cycle) can be determined / configured by higher layer signaling (such as RRC signaling) provided by the BS to the UE.

[0123] In the present disclosure, DRX may refer to C-DRX and / or I-DRX.

[0124] In the present disclosure, a period during which a UE (configured with DRX) may be expected to receive a DL signal within a DRX cycle may be expressed as a DRX activation time (or On-Duration).

[0125] When the UE is configured with DRX, the configuration / application of the proposed above methods (i.e., methods [1] to [3]) may vary between the DRX activation time and other time periods. For example, the proposed methods may be applied / configured during DRX activity and may not be applied / configured during other time periods. Alternatively, the proposed methods may not be applied / configured during DRX activity time (i.e., operating in non-NES mode) and may be applied / configured during other time periods for NES mode operation.

[0126] When the UE is configured with DRX, the above-proposed method may apply different configurations between the DRX active time and other time periods within the DRX cycle. For example, the SSSG switching related operations described in subsection [1] may be configured separately for the DRX active time and other time periods. Alternatively, the operations related to PDCCH monitoring adaptation or PDCCH skipping described in subsection [2] may be configured differently for the DRX active time and other time periods. Alternatively, the UE may operate in NES mode during the DRX active time and in non-NES mode during other time periods. On the other hand, the UE may operate in non-NES mode during the DRX active time and in NES mode during other time periods.

[0127] For multiple DRX configurations, the proposed above method may be applied differently for each DRX configuration. That is, for some DRX configurations (or when the UE receives a DRX configuration), the UE may operate in NES mode, and for other DRX configurations (or when the UE receives other DRX configurations), the UE may operate in non-NES mode. In this case, one of the multiple DRX configurations (i.e., DRX configuration switching) may be one DRX configuration configured / indicated by RRC signaling (GC-DCI or MAC-CE) among the N DRX configurations provided to the UE via (UE-specific) RRC signaling.

[0128] For example, when the UE operates in a NES BWP (or non-NES BWP) according to DRX configuration #1, if the DRX configuration is switched to DRX configuration #2 (due to an indication of DRX configuration switching), the UE may switch to the non-NES BWP (or NES BWP).

[0129] For multiple DRX configurations, the proposed above method may be applied differently for each DRX configuration. That is, for some DRX configurations (or when a DRX configuration is provided), a specific method in the proposed method may be applied / configured, and for other DRX configurations (or when other DRX configurations are provided), a different specific method in the proposed method may be applied / configured.

[0130] The proposed above method may be configured / applied differently for each BWP. That is, for some BWPs (or when the BWP is an active BWP), the UE may operate in NES mode, and for other BWPs (or when other BWPs are active BWPs, or when a BWP operating in NES mode is changed to an inactive BWP), the UE may operate in non-NES mode.

[0131] In the proposed method, the timer associated with the NES mode (or non-NES mode) may be suspended (held) or (re)started during the NES mode (or non-NES mode). Alternatively, the timer may be suspended during the DRX active time (or other time period).

[0132] Additionally, for example, during an NES mode (eg, NES duration), the timer may remain paused without decrementing or incrementing, and the counting operation may resume once the NES mode (eg, NES duration) ends.

[0133] Additionally, the SCS for determining the time slot in which the timer is reduced (for indicating NES mode switching) can be configured based on the smaller value between the SCS of the PDCCH and the SCS of the timer domain (e.g., PDSCH). Alternatively, the SCS for determining the time slot in which the timer is reduced can be configured based on the minimum SCS (the SCS in the active or inactive state) between the SCS of the PDCCH and the SCS of the PDSCH.

[0134] Additionally, when multiple cells are linked to the timer (and related configuration / operation) (this may be preconfigured via RRC signaling), the timer may be configured or operated for each cell group.

[0135] In the proposed method, when multiple cells are configured for a UE configured with DRX, in order to operate only some specific cells in NES mode (or non-NES mode), the UE may group cells belonging to the same DRX configuration (or DRX group) in advance and configure the timer to operate on a cell group basis. The operation of the timer includes incrementing, decrementing, pausing and (re)starting the timer.

[0136] [5] A method for indicating a certain DRX configuration to be actually applied among the multiple DRX configurations when multiple DRX configurations are configured

[0137] In the present disclosure, the DRX configuration may be a DRX configuration configured for an idle / inactive UE. Alternatively, the DRX configuration may be a C-DRX configuration configured for a connected UE. Alternatively, the DRX configuration may also be a configuration that configures the DTX and / or DRX pattern of the BS in a cell-specific (or UE group common) manner (referred to as cell DTX / DRX for convenience). The BS may preconfigure multiple DRX configurations for various purposes and indicate one or more DRX configurations to be applied among the DRX configurations.

[0138] For example, the SSSG switching described in method [1] can be used. Specifically, among the SSSGs configured for the UE, some (or specific) SSSGs are configured for DRX configuration #1 (e.g., C-DRX configuration), while other (or different specific) SSSGs are configured for DRX configuration #2 (e.g., cell DTX / DRX). The switch between DRX configuration #1 and DRX configuration #2 can be indicated by an SSSG switch between two different SSSGs. Specifically, the start of DRX configuration #1 or the end of DRX configuration #1 can be indicated. In this case, the switching mechanism, trigger condition and / or related parameter configuration (e.g., P_switch) for SSSG switching can be configured according to the method disclosed in Table 5. Alternatively, a switching mechanism, trigger condition and / or related parameter configuration (e.g., P_switch) different from those in Table 5 can be applied to the UE.

[0139] As another example, the PDCCH monitoring / skipping described in method [2] may be used. Specifically, among the skipping durations configured for the UE, some (or specific) durations are configured for DRX configuration #1 (e.g., C-DRX configuration), while other (or different specific) durations are configured for DRX configuration #2 (e.g., cell DTX / DRX). When the specific duration is indicated by the PDCCH monitoring adaptation field in the DCI (in a manner similar to the above-mentioned SSSG switching), the DRX configuration to be applied may be indicated.

[0140] As another example, the DRX configuration index to be applied may be indicated by a mechanism similar to activating (or deactivating) DCI (for SPS or type 2 CG). For example, for DCI scrambled with a specific RNTI (e.g., SPS-C-RNTI or CS-RNTI), if a specific verification condition is met (e.g., when the NDI value = 0 or when the FDRA field is all 0s or all 1s), the DRX configuration corresponding to the code point indicated by a specific field in the DCI (e.g., HARQ process index) may be activated or released (based on the verification condition).

[0141] As another method, the BS may pre-configure an SSSG for SSSG switching for each DRX configuration (for various purposes), and the SSSG to be monitored by the UE may change based on the DRX configuration currently applied to the UE.

[0142] Specifically, among the SSSGs configured for SSSG switching for the UE, some (or specific) SSSGs are configured for DRX configuration #1 (e.g., C-DRX configuration), while other (or different specific) SSSGs are configured for DRX configuration #2 (e.g., cell DTX / DRX). Subsequently, PDCCH monitoring may be performed on the SSSG associated with the DRX configuration actually configured (or applied) to the UE among the two different DRX configurations. In this case, the switching mechanism, triggering condition, and / or related parameter configuration (e.g., P_switch) for SSSG switching associated with each DRX configuration may be configured in the same manner as described in Table 5. Alternatively, a switching mechanism, triggering condition, and / or related parameter configuration (e.g., P_switch) different from those in Table 5 may be applied to the UE.

[0143] Alternatively, the BS may pre-configure a PDCCH monitoring skipping / adaptation method for each DRX configuration (for various purposes), and the PDCCH monitoring skipping / adaptation method to be applied by the UE may change based on the DRX configuration currently applied to the UE. Specifically, among the skipping durations configured for the UE, some (or specific) durations are configured for DRX configuration #1 (e.g., C-DRX configuration), while other (or different specific) durations are configured for DRX configuration #2 (e.g., cell DTX / DRX). When the DRX configuration changes (or is configured), the UE may switch and operate based on the PDCCH monitoring skipping / adaptation associated with the (changed) DRX configuration.

[0144] According to the proposed method, multiple DRX configurations are preconfigured, and the DRX configuration index to be applied or not applied is indicated by SSSG switching, PDCCH skipping / adaptation, and activation (deactivation) DCI. Alternatively, multiple candidate values ​​for (specific) parameters (e.g., offset value of DRX on-duration, DRX cycle, etc.) included in a single DRX configuration are configured. The actual value to be applied can be easily indicated by mechanisms such as SSSG switching, PDCCH skipping / adaptation, and activation (deactivation) DCI.

[0145] The content of the present disclosure is not limited to UL and / or DL ​​signal transmission and reception. For example, the content of the present disclosure can also be used for direct communication between UEs. In this document, the term base station (BS) can be understood as including the concept of relay node and BS. For example, the operation of the BS described in the present disclosure can be performed by the relay node as well as the BS.

[0146] Obviously, each example of the proposed method can also be included as an implementation method of the present disclosure, so each example can be regarded as a proposed method. Although the above-mentioned proposed methods can be implemented independently, some of the proposed methods can be combined and implemented. In addition, it can be stipulated that information about whether to apply the proposed method (or information about rules related to the proposed method) is sent from the BS to the UE in a predefined signal (e.g., physical layer signaling or higher layer signaling).

[0147] Implementation Example

[0148] Figure 4 is a flowchart illustrating a resource configuration method according to an embodiment of the present disclosure.

[0149] Reference Figure 4 According to an embodiment of the present disclosure, the method for configuring the NES mode may be performed by a UE, and the method may include: receiving DCI (S501); performing SSSG switching or PDCCH monitoring skipping (S503); and switching to the NES mode (S505). Figure 4 In addition to the operations in [1] to [5], at least one of the operations described in [1] to [5] may also be performed.

[0150] For example, referring to subsection [1], the DCI may include the SSSG switching flag field in DCI format 2_0. Referring to subsection [2], the DCI may be used to schedule signals and / or channels such as PDSCH, PUSCH, etc., and the DCI may include a PDCCH monitoring adaptation field.

[0151] Referring to Table 5, if the UE detects DCI format 2_0 and the value of the SSSG switching flag field is 0, the UE may stop PDCCH monitoring according to the search space set with group index 1 and start PDCCH monitoring according to the search space set with group index 0. Additionally, if the UE detects DCI format 2_0 and the value of the SSSG switching flag field is 1, the UE may stop PDCCH monitoring according to the search space set with group index 0 and start PDCCH monitoring according to the search space set with group index 1.

[0152] In summary, based on the value of the SSSG switching flag, the UE performs SSSG switching by starting PDCCH monitoring according to the search space set with the first set of indices while stopping PDCCH monitoring according to the search space set with the second set of indices.

[0153] Referring to subsection [1], each SSSG can be associated with an NES mode or a non-NES mode. In subsection [1], four types of NES modes are described: an NES mode in the time domain, an NES mode in the frequency domain, an NES mode for the spatial domain, and an NES mode for the power domain. However, the NES mode associated with each SSSG is not limited to these four types. Including NES modes not described in subsection [1], the NES mode associated with each SSSG can be expressed as NES mode #1, NES mode #2, etc. Additionally, in the following description, the NES mode may include a non-NES mode.

[0154] Referring to subsection [1], when SSSG switching is performed, the NES mode is also switched from the NES mode associated with the existing SSSG to the NES mode associated with the new SSSG. Therefore, when PDCCH monitoring according to a search space set with a first group of indices is started and PDCCH monitoring according to a search space set with a second group of indices is stopped, the UE can operate in the first NES mode associated with the search space set with the first group of indices and release or deactivate the configuration of the second NES mode associated with the search space set with the second group of indices.

[0155] Additionally, referring to section [1], two SSSGs are configured within a single BWP. Therefore, including switching between the two SSSGs within a single BWP, switching can be configured between a total of 2N SSSGs, two SSSGs for each of the N different BWPs. As a result, switching between 2N NES modes is possible.

[0156] As another example, referring to subsection [2] and Table 5, the PDCCH monitoring adaptation field may indicate SSSG switching or PDCCH monitoring skipping based on its value.

[0157] If the PDCCH monitoring adaptation field indicates to start PDCCH monitoring according to a search space set with a first set of indices and stop PDCCH monitoring according to a search space set with a second set of indices, the UE applies the indication starting from the earliest time slot after at least P_switch symbols from the last symbol in which the DCI was received.

[0158] Once the indication is applied, that is, once monitoring according to the search space set having the first set of indices is initiated, the UE may operate in a first NES mode associated with the search space set having the first set of indices and release or deactivate the configuration of a second NES mode associated with the search space set having the second set of indices.

[0159] Additionally, the PDCCH monitoring adaptation field may indicate a PDCCH monitoring skip for a specific duration. Referring to Table 5, different durations may be indicated based on the value of the PDCCH monitoring adaptation field. For example, if the value of the PDCCH monitoring adaptation field is a first value, a first duration from a duration set may be indicated, and if the value is a second value, a second duration from a duration set may be indicated. As the number of bits in the PDCCH monitoring adaptation field increases, the number of durations that may be indicated may also increase.

[0160] Similar to SSSG, each duration may be associated with a different NES mode.Thus, if the PDCCH monitoring adaptation field indicates a first value, a first NES mode may be configured, and if the PDCCH monitoring adaptation field indicates a second value, a second NES mode may be configured.

[0161] Additionally, referring to subsection [3], if switching between NES modes is triggered by DCI for scheduling a channel (e.g., PDSCH or PUSCH), the UE may perform switching between NES modes immediately after transmission or reception of the channel is completed. The completion point of transmission or reception may be the last symbol in which the channel is assigned. Although expressed as "immediately", the UE may switch the NES mode starting from a symbol immediately following the last symbol in which the channel is transmitted or received or from the earliest time slot after the last symbol in which the channel is transmitted or received.

[0162] Alternatively, if switching between NES modes is triggered by DCI for scheduling a channel, the UE may perform switching between NES modes after a predetermined period of time has elapsed immediately after transmission or reception of the channel is completed.

[0163] Alternatively, if switching between NES modes is triggered by DCI for scheduling channels, the UE may perform switching between NES modes only when HARQ feedback for the channel is ACK. If the HARQ feedback for the channel is NACK, the UE may resend or re-receive the channel and may not perform switching between NES modes until the HARQ feedback is ACK.

[0164] The embodiments described in each subsection may be combined and performed together. For example, after the second NES mode switches to the first NES mode based on the SSSG switching flag field disclosed in subsection [1], the first NES mode may switch back to the first NES mode or switch to a separate third NES mode based on the PDCCH monitoring adaptation field disclosed in subsection [2]. Alternatively, after the second NES mode switches to the first NES mode based on the SSSG switching flag field disclosed in subsection [1], the second NES mode may switch back to the first NES mode or switch to a separate third NES mode based on the DCI for scheduling channels disclosed in subsection [3].

[0165] As another combinable embodiment, referring to subsection [4], the application of the embodiments in subsections [1] to [3] may vary depending on the DRX configuration. For example, when the first DRX is configured, switching between NES modes is performed according to the embodiments described in subsections [1] to [3] of the present disclosure. However, when the second DRX is configured, switching between NES modes may not be performed even if SSSG switching or PDCCH monitoring skipping is indicated.

[0166] Alternatively, when the first DRX is configured, the NES mode switching may be performed based on the SSSG switching flag field.When the second DRX is configured, the NES mode switching may be performed based on the PDCCH monitoring adaptation field.

[0167] In addition to reference Figure 4 In addition to the operations described, you can also combine and further perform reference Figures 1 to 3 and / or one or more of the operations described in subsections [1] to [5].

[0168] Example of a communication system to which the present disclosure is applied

[0169] The various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure described herein may be applied to (but not limited to) various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0170] More specific examples will be described below with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise specified, similar reference numerals represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0171] Figure 5 A communication system 1 applied to the present disclosure is shown.

[0172] Reference Figure 5, the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. The wireless device is a device that performs communication using a radio access technology (RAT) (e.g., 5G NR (or new RAT) or LTE), also referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of vehicle-to-vehicle (V2V) communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television (TV), a smart phone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptop computers). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node for other wireless devices.

[0173] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without the intervention of the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., V2V / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0174] Wireless communication / connection 150a, 150b, and 150c may be established between wireless devices 100a to 100f / BS 200 and between BSs 200. Herein, wireless communication / connection may 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 (e.g., relay or integrated access backhaul (IAB)). Wireless signals may be sent and received between wireless devices, between wireless devices and BSs, and between BSs through wireless communication / connection 150a, 150b, and 150c. For example, signals may be sent and received via various physical channels through wireless communication / connection 150a, 150b, and 150c. To this end, at least a portion of various configuration information for configuring a process for sending / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and a resource allocation process may be performed based on various proposals of the present disclosure.

[0175] Example of wireless device to which the present disclosure is applied

[0176] Figure 6 A wireless device suitable for use with the present disclosure is shown.

[0177] Reference Figure 6 , the first wireless device 100 and the second wireless device 200 may transmit wireless signals through various RATs (eg, LTE and NR). {The first wireless device 100 and the second wireless device 200} may correspond to Figure 5 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0178] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and also include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a wireless signal including the first information / signals through the transceiver 106. The processor 102 may receive a wireless 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 connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including instructions for executing all or part of the processing controlled by the processor 102 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. 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 connected to the processor 102 and transmit and / or receive wireless signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0179] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and also include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a wireless signal including the third information / signals through the transceiver 206. The processor 202 may receive a wireless signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including instructions for executing all or part of the processing controlled by the processor 202 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. 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 connected to the processor 202 and transmit and / or receive wireless signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0180] Now, 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 not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), RRC, and service data adaptation protocol (SDAP)). 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 in this document. 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 in this document, and provide these messages, control information, data, or information to one or more transceivers 106 and 206. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from 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 in this document.

[0181] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by 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 one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software 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 in this document may be included in one or more processors 102 and 202 or may be stored in one or more memories 104 and 204 and driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, instructions and / or instruction sets using firmware or software.

[0182] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be configured to include read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cache memory, computer-readable storage media and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0183] One or more transceivers 106 and 206 may send user data, control information and / or wireless signals / channels mentioned in the method and / or operation flow chart of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information and / or wireless signals / channels mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive wireless signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or wireless signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or wireless signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods, and / or operation flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert the received wireless signals / channels from RF band signals to baseband signals so as to process the received user data, control information, and wireless signals / channels using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert the user data, control information, and wireless signals / channels processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0184] Example of use of wireless device to which the present disclosure is applied

[0185] Figure 7 Another example of a wireless device applicable to the present disclosure is shown. The wireless device can be based on the use case / service (refer to Figure 5 ) are implemented in various forms.

[0186] Reference Figure 7 , the wireless devices 100 and 200 may correspond to Figure 6The wireless devices 100 and 200 may be configured to include 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 110 may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 6 The one or more processors 102 and 202 and / or the one or more memories 104 and 204 of the present invention. For example, the transceiver 114 may include Figure 6 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and provides overall control of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / instruction / information stored in the memory unit 130. The control unit 120 may 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 in the memory unit 130 through a wireless / wired interface.

[0187] 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 supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in (but not limited to) a robot ( Figure 5 100a), vehicles ( Figure 5 100b-1 and 100b-2), XR devices ( Figure 5 100c), handheld device ( Figure 5 100d), household appliances ( Figure 5 100e), IoT devices ( Figure 5 100f), digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, AI servers / devices ( Figure 5 400), BS ( Figure 5 200), network node, etc. Depending on the use case / service, the wireless device can be mobile or fixed.

[0188] exist Figure 7In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured using a collection of one or more processors. For example, the control unit 120 may be configured using 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 130 may be configured using RAM, dynamic RAM (DRAM), ROM, flash memory, volatile memory, non-volatile memory and / or a combination thereof.

[0189] Examples of vehicles or autonomous driving vehicles to which the present disclosure is applied

[0190] Figure 8 A vehicle or an autonomous vehicle applied to the present disclosure is shown. The vehicle or the autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0191] Reference Figure 8 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 a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Figure 7 Block 110 / 130 / 140.

[0192] The communication unit 110 may send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous driving vehicle 100. The control unit 120 may include an ECU. The drive unit 140a may enable the vehicle or autonomous driving vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous driving vehicle 100 and include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire information about the vehicle status, surrounding environment information, user information, etc. 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 position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a route if a destination is set, and the like.

[0193] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 may aperiodically / periodically obtain the latest traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c may obtain information about the vehicle state and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving route, and / or driving plan to an external server. The external server may predict traffic information data using AI technology based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0194] Those skilled in the art will appreciate that the present disclosure may be implemented in other specific ways than those described herein without departing from the spirit and essential characteristics of the present disclosure. Therefore, the above embodiments are to be interpreted in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents (rather than the above description), and all changes falling within the meaning and equivalent scope of the appended claims are intended to be covered therein.

[0195] Industrial Applicability

[0196] As described above, the present disclosure is applicable to various wireless communication systems.

Claims

1. A method for configuring a network energy saving (NES) mode by a user equipment (UE) in a wireless communication system, the method comprising: receiving downlink control information (DCI) including a search space set group (SSSG) switch flag field; performing an SSSG handover based on the value of the SSSG handover flag field, wherein physical downlink control channel (PDCCH) monitoring according to a search space set having a first set of indices is started, and PDCCH monitoring according to a search space set having a second set of indices is stopped; as well as Based on the SSSG switching, a switch is performed from a second NES mode associated with a search space set having the second set of indices to a first NES mode associated with a search space set having the first set of indices.

2. The method according to claim 1, wherein: One of the first NES mode and the second NES mode is a non-NES mode.

3. The method according to claim 1, wherein: The search space set with the first set of indices is configured in a first bandwidth part (BWP) (bandwidth part), and The search space set with the second group of indexes is configured in a second BWP.

4. The method according to claim 1, wherein: The first NES mode is one of the following four NES modes: a NES mode in the time domain, a NES mode in the frequency domain, a NES mode in the space domain, and a NES mode in the power domain, and The second NES mode is one of the four modes that is different from the first NES mode.

5. The method according to claim 1, further comprising: receiving a second DCI including a PDCCH monitoring adaptation field in a search space set having the first group of indices; Instructing the UE to start the PDCCH monitoring according to the search space set with the second group index and stop the PDCCH monitoring according to the search space set with the first group index based on the PDCCH monitoring adaptation field, starting the PDCCH monitoring according to the search space set with the second group index from the earliest time slot after at least P_switch symbols from the last symbol of the second DCI received therein; Based on initiation of the PDCCH monitoring according to the search space set with the second group index, switching from the first NES mode to the second NES mode is performed.

6. The method according to claim 1, further comprising: receiving a second DCI including a PDCCH monitoring adaptation field in a search space set having the first group of indices; skipping the PDCCH monitoring for a specific duration based on the PDCCH monitoring adaptation field, wherein a first value of the PDCCH monitoring adaptation field indicates a first duration in a set of durations, and a second value of the PDCCH monitoring adaptation field indicates a second duration in the set of durations; based on the initiation of the skip, maintaining the first NES mode based on the specific duration being the first duration; as well as Based on the start of the skip, switching from the first NES mode to the second NES mode is performed based on the specific duration being the second duration.

7. The method according to claim 1, further comprising: Receiving a second DCI for scheduling a channel in a search space set having the first group of indices; as well as Switching from the first NES mode to the second NES mode is performed starting from an earliest time slot after a last symbol of the channel is transmitted or received therein.

8. The method according to claim 1, further comprising: Receiving a second DCI for scheduling a channel in a search space set having the first group of indices; as well as Switching from the first NES mode to the second NES mode is performed from an earliest time slot after a predetermined period of time from the time in which the last symbol of the channel is transmitted or received.

9. The method according to claim 1, further comprising: Receiving a second DCI for scheduling a channel in a search space set having the first group of indices; as well as Switching from the first NES mode to the second NES mode is performed based on hybrid automatic repeat request (HARQ) information for the channel being acknowledged (ACK).

10. The method according to claim 1, wherein: performing a switch from the second NES mode to the first NES mode based on the SSSG switch based on a first discontinuous reception (DRX) being configured, and Wherein, based on the second DRX being configured, the switching from the second NES mode to the first NES mode is performed not based on the SSSG switching.

11. A user equipment (UE) configured to configure a network energy saving (NES) mode in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as At least one memory, the at least one memory being operably connected to the at least one processor and storing instructions, the instructions, when executed, causing the at least one processor to perform specific operations, the specific operations comprising: receiving downlink control information (DCI) including a search space set group (SSSG) switch flag field; performing SSSG switching based on the value of the SSSG switching flag field, wherein physical downlink control channel (PDCCH) monitoring according to a search space set with a first group index is started, and PDCCH monitoring according to a search space set with a second group index is stopped; and Based on the SSSG switching, a switch is performed from a second NES mode associated with a search space set having the second set of indices to a first NES mode associated with a search space set having the first set of indices.

12. An apparatus for a user equipment (UE) configured to configure a network energy saving (NES) mode, the apparatus comprising: at least one processor; as well as at least one computer memory operably connected to the at least one processor and configured to, when executed, cause the at least one processor to perform operations comprising: receiving downlink control information (DCI) including a search space set group (SSSG) switch flag field; performing SSSG switching based on the value of the SSSG switching flag field, wherein physical downlink control channel (PDCCH) monitoring according to a search space set with a first group index is started, and PDCCH monitoring according to a search space set with a second group index is stopped; and Based on the SSSG switching, a switch is performed from a second NES mode associated with a search space set having the second set of indices to a first NES mode associated with a search space set having the first set of indices.

13. A computer-readable non-volatile storage medium, the computer-readable non-volatile storage medium comprising at least one computer program, the at least one computer program being configured to cause a user equipment (UE) to perform operations, wherein the UE comprises at least one processor and is configured to configure a network energy saving (NES) mode, the operations comprising: receiving downlink control information (DCI) including a search space set group (SSSG) switch flag field; performing an SSSG handover based on the value of the SSSG handover flag field, wherein physical downlink control channel (PDCCH) monitoring according to a search space set having a first set of indices is started, and PDCCH monitoring according to a search space set having a second set of indices is stopped; as well as Based on the SSSG switching, a switch is performed from a second NES mode associated with a search space set having the second set of indices to a first NES mode associated with a search space set having the first set of indices.

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