Paging frame setting method for network energy saving and apparatus thereof

Abstract

A method according to an embodiment of the present specification comprises the steps of: receiving information related to a cell from a base station; and receiving paging from the base station. The information related to the cell includes: (i) a periodicity of a first synchronization signal / physical broadcast channel (SS / PBCH) block (SSB); and (ii) a setting related to paging.

Description

Method for setting a paging frame for network energy saving and the device thereof

[0001] This specification relates to a paging frame setting method and apparatus for saving network energy in a wireless communication system.

[0002] The 5G mobile communication system is a successor technology to LTE (Long Term Evolution) and is a new clean-slate type of mobile communication system characterized by high performance, low latency, and high availability. In the case of 5G NR, all available spectrum resources can be utilized, ranging from low-frequency bands below 1 GHz to intermediate frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz. Based on the underlying technology of 5G mobile communication, 6G mobile communication systems are being developed.

[0003] The 6G (wireless communication) system aims for (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption of battery-free IoT (internet of things) devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity.

[0004] Time domain adaptation methods for Synchronization Signal Blocks (SSBs) are being considered for Network Energy Saving (NES).

[0005] To achieve Network Energy Saving (NES), a method is being considered for base stations to adapt the periododicity of Synchronization Signal Blocks (SSBs). When the periododicity of an SSB is changed, the number of available Paging Frames (PFs) may be limited according to the changed periododicity of the SSB. The purpose of this specification is to propose a method for determining whether to change the number of existing PFs according to the changed periododicity of the SSB.

[0006] To obtain NES gain, an SSB period for the NES mode and an additional SSB period for the non-NES mode may be set. Another objective of this specification is to propose a method for determining the additional SSB period and a method for determining the number of PFs based on the additional SSB period.

[0007] The technical problems to be solved in this specification are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0008] To solve the aforementioned technical problem, a method according to one embodiment of the present specification includes the step of receiving information related to a cell from a base station and the step of receiving paging from the base station.

[0009] The information related to the cell includes i) the periododicity of the first Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block (SSB) and ii) settings related to paging.

[0010] The above settings related to paging include information indicating whether the number of paging frames (PF) is changed based on the change in the period of the first SSB.

[0011] Through this, when changing the cycle of an SSB for Network Energy Saving (NES), the number of PFs appropriate for the changed SSB cycle is determined, thereby preventing errors in PF setting and improving the reliability of the paging reception procedure.

[0012] The above settings related to paging may include one or more candidates that can be set for the number of the above PFs.

[0013] Information indicating whether the number of the above PFs is changed may include information indicating a change in the number of the above PFs based on one or more of the candidates for the period of the first SSB in which the number of the set above PFs is changed.

[0014] The number of the above PFs may be changed based on the rate at which the period of the above 1 SSB is changed.

[0015] The number of the above PFs can be determined based on the period during which the first SSB and the second SSB are transmitted.

[0016] Information regarding the period of the above-mentioned second SSB may be included in the above-mentioned first SSB.

[0017] The number of the PFs determined based on the periods of the first SSB and the second SSB may be a value that is pre-set or defined for each period of the second SSB.

[0018] The period of the second SSB may be shorter than the period of the first SSB.

[0019] The above second SSB may be transmitted at a different time than when the above first SSB is transmitted.

[0020] The cycle of the above second SSB can be set so that two or more second SSBs are transmitted between two consecutive PFs.

[0021] Among the above two or more second SSBs, one or more second SSBs other than the second SSB located immediately before the second PF may be dropped.

[0022] The period of the above-mentioned second SSB can be determined based on the positions of the set PFs.

[0023] The period of the above-mentioned second SSB can be determined to be the same as the interval between two consecutive PFs.

[0024] Based on the fact that the interval between the transmission time of the first SSB and the transmission time of the second SSB is within a certain time interval, the second SSB may be dropped.

[0025] The above-mentioned first SSB may be i) a third SSB related to Network Energy Saving (NES) or ii) a fourth SSB other than the above-mentioned third SSB.

[0026] The number of the above PFs can be determined as i) a first number based on the third SSB or ii) a second number based on the fourth SSB.

[0027] The second number may be equal to or less than the first number.

[0028] The number of the above PFs can be determined as the smallest candidate among the above one or more candidates.

[0029] A terminal according to another embodiment of the present specification comprises one or more transceivers, one or more processors, and one or more memories connected to the one or more processors and storing instructions. The instructions are characterized by causing the terminal to perform all steps of any one of the methods based on execution by the one or more processors.

[0030] An apparatus according to another embodiment of the present specification comprises one or more memories and one or more processors connected to the one or more memories. The one or more memories are characterized by storing instructions that cause the apparatus to perform all steps of any one of the methods based on execution by the one or more processors.

[0031] A non-transitory computer-readable medium according to another embodiment of the present specification stores instructions. The instructions, executable by one or more processors, are characterized by enabling a terminal to perform all steps of any one of the methods.

[0032] A method according to another embodiment of the present specification includes the steps of transmitting information related to a cell to a terminal and transmitting paging to the terminal.

[0033] The information related to the cell includes i) the periododicity of the first Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block (SSB) and ii) settings related to paging.

[0034] The above settings related to paging include information indicating whether the number of paging frames (PF) is changed based on the change in the period of the first SSB.

[0035] A base station according to another embodiment of the present specification comprises one or more transceivers, one or more processors, and one or more memories connected to the one or more processors and storing instructions. The instructions are characterized by causing the base station to perform all steps of the method based on execution by the one or more processors.

[0036] When a base station changes the periododicity of a Synchronization Signal Block (SSB) for Network Energy Saving (NES), the number of Paging Frames (PFs) available may be limited depending on the changed periododicity of the SSB. According to an embodiment of the present specification, by instructing a terminal whether to change the number of PFs based on whether the number of currently applied PFs is the number of PFs that can be applied in the changed SSB, the occurrence of errors in PF-related settings when changing the periododicity of the SSB can be prevented. This can improve the reliability of the paging reception procedure.

[0037] To obtain NES gain, the period of the SSB for the NES mode and the additional period of the SSB for the non-NES mode may be set. According to an embodiment of the present specification, the base station can efficiently switch between the NES mode and the non-NES mode by determining the number of PFs based on the additional period of the SSB and the method for determining the additional period of the SSB.

[0038] The effects obtainable in this specification are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0039] The drawings attached below are intended to aid in understanding the present disclosure and may provide embodiments of the present disclosure together with the detailed description. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with one another to form new embodiments. Reference numerals in each drawing may denote structural elements.

[0040] Figure 1 illustrates an example of the operation procedure of a base station supporting NES technology.

[0041] Figure 2 illustrates an example of a procedure for cell DTX / DRX operation.

[0042] FIG. 3 is a diagram illustrating the transmission interval of a default SSB and the configured Paging Frames according to an embodiment of the present specification.

[0043] FIG. 4 is a diagram illustrating an additional SSB that is additionally transmitted between default SSBs according to an embodiment of the present specification.

[0044] FIG. 5 is a drawing illustrating the exclusion of some additional SSBs according to an embodiment of the present specification.

[0045] FIG. 6 is a diagram illustrating the offset between the Paging Frame and the additional SSB according to an embodiment of the present specification.

[0046] FIG. 7 is a flowchart illustrating a method according to one embodiment of the present specification.

[0047] FIG. 8 is a flowchart illustrating a method according to another embodiment of the present specification.

[0048] FIG. 9 is a drawing showing the configuration of a first device and a second device according to an embodiment of the present specification.

[0049] In this specification, "A or B" may mean "only A," "only B," or "both A and B." Alternatively, in this specification, "A or B" may be interpreted as "A and / or B." For example, in this specification, "A, B or C" may mean "only A," "only B," "only C," or "any combination of A, B and C."

[0050] A slash ( / ) or a comma used in this specification may mean "and / or." For example, "A / B" may mean "A and / or B." Accordingly, "A / B" may mean "only A," "only B," or "both A and B." For example, "A, B, C" may mean "A, B or C."

[0051] In this specification, "at least one of A and B" may mean "only A," "only B," or "both A and B." Additionally, in this specification, the expressions "at least one of A or B" or "at least one of A and / or B" may be interpreted as synonymous with "at least one of A and B."

[0052] Additionally, in this specification, "at least one of A, B and C" may mean "only A," "only B," "only C," or "any combination of A, B and C." Also, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C."

[0053] Additionally, parentheses used in this specification may mean "for example." Specifically, when indicated as "control information (ABC)," "ABC" may be described as an example of "control information." For example, "control information" may include DEF as another example. In other words, "control information" in this specification is not limited to "ABC," and "ABC" may be described as an example of "control information." Also, when indicated as "control information (i.e., ABC)," "ABC" may be described as an example of "control information."

[0054] In addition, terms such as "first," "second," etc. in this specification are used solely for the purpose of distinguishing one component from another and are not used to limit the components, nor are they used to limit the order or importance of the components unless specifically limited. Accordingly, a first component in one embodiment of this specification may be referred to as a second component in another embodiment, and likewise, a second component in one embodiment may be referred to as a first component in another embodiment.

[0055] In the following explanation, 'when, if, in case of' can be replaced with 'based on'.

[0056] Technical features described individually within a single drawing in this specification may be implemented individually or simultaneously.

[0057] In this specification, a terminal is a user-side device (user equipment, UE) or a consumer-side device, and may also be referred to as a first node that receives / transmits signals from / to a base station / second node / IAB node / Transmission-Reception Point (TRP). A terminal may correspond to a physical node or a logical node. A terminal may correspond to a user-side endpoint or an intermediate point between other endpoints. In communication between two points not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), a terminal may correspond to a served node. A terminal may be a fixed-location node or a non-fixed-location (or mobile) node.

[0058] In this specification, a Base Station (BS) is a device on the network side and may also be referred to as a second node / IAB node / x-NodeB (x-NodeB, where x may be an abbreviation related to Radio Access Technology (RAT)) / Transmission-Reception Point (TRP). A Base Station may correspond to a physical node or a logical node. A Base Station may correspond to an endpoint on the network side or an intermediate point between other endpoints. In communication between two points not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), a Base Station may correspond to a serving node. A Base Station may be a node with a fixed location or a node with an indefinite location.

[0059] In this specification, higher layer parameters may be set for the terminal, pre-set, or pre-defined. For example, a base station may transmit higher layer parameters to the terminal. For example, the terminal may transmit parameters such as capability to the base station as higher layer parameters. For example, higher layer parameters may be transmitted via RRC (radio resource control) signaling or MAC (medium access control) signaling.

[0060] In this specification, information / state / parameters being "configured" or "pre-configured" may be interpreted as the information / state / parameters being provided / pre-provided to the terminal through pre-defined signaling (e.g., SIB, MAC, RRC) from the base station. In this specification, information / state / parameters being "defined" or "pre-defined" may be interpreted as being known or stored in advance by the base station and the terminal without signaling between the base station and the terminal.

[0061] Hereinafter, preferred embodiments according to the present specification will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present specification and is not intended to represent the only embodiment in which the invention according to the present specification can be practiced. The following detailed description includes specific details to provide a complete understanding of the present specification.

[0062] In some cases, to avoid obscuring the concept of the invention according to the embodiments of this specification, known structures and devices may be omitted or illustrated in the form of a block diagram focusing on the core functions of each structure and device.

[0063] In the following, the downlink (DL) refers to communication from a base station to a terminal, and the uplink (UL) refers to communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal and the receiver may be part of the base station. The base station may be referred to as the first communication device and the terminal as the second communication device. The base station (BS) may be replaced by terms such as fixed station, Node B, eNB (evolved-NodeB), gNB (Next Generation NodeB), BTS (base transceiver system), Access Point (AP), network (5G network), AI system, RSU (road side unit), vehicle, robot, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc. In addition, the terminal may be fixed or mobile and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, robot, AI module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device.

[0064] Network Energy Saving Technology (Rel-18)

[0065] Energy conservation in base stations is considered important in wireless communication systems, including 3GPP, as it contributes to building eco-friendly networks by reducing carbon emissions and lowering the operational expenditures (OPEX) of telecommunications operators. In particular, as the introduction of 5G communication requires high transmission rates, base stations must be equipped with a larger number of antennas and provide services through wider bandwidths and frequency bands. Consequently, according to recent studies, energy costs for base stations have reached the level of 20% of total OPEX. Accordingly, 5G systems are adopting various technologies to reduce energy consumption under the name of Network Energy Savings (NES), and the standardization of related technologies is expected to continue. Specifically, the recently held Rel-18 session discussed the techniques shown in Table 1 below.

[0066]

[0067] With the application of NES technology, the base station can perform operations such as controlling on / off for a certain duration in the time axis, controlling transmit / receive resources for UE-common or UE-specific signals / channels, changing the amount of resources in the frequency axis, controlling transmission power, or turning on / off antenna ports, TRPs (transmission-reception points), etc. in the spatial domain.

[0068] Figure 1 illustrates an example of the operation procedure of a base station supporting NES technology.

[0069] Referring to FIG. 1, the base station identifies the NES solution(s) to be applied. The NES solution(s) may be related to the control of signal transmission and reception (e.g., on / off), beam operation, handover procedures, channel measurement and reporting, etc. Which NES solution(s) to apply may be adaptively selected based on the current situation (e.g., cell load level, characteristics of connected terminals, etc.) or may be predefined. The base station that has identified the NES solution(s) performs signaling for the NES. The specific signaling procedure may vary depending on the identified NES solution(s). For example, the base station may transmit common information regarding the NES solution(s), transmit configuration information necessary for NES operation to at least one terminal, or transmit control information regarding the progress of the NES operation to at least one terminal. Additionally, the base station may receive capability information related to the NES from at least one terminal. Subsequently, the base station performs operations for the NES. At this time, the base station may perform operations for the NES based on the signaling performed earlier. That is, depending on the system information, configuration information, and control information transmitted through signaling, the base station can turn the transmission and reception of specific signals on / off, turn elements of the spatial domain on / off, or adjust resources for the transmission and reception of measurement signals.

[0070] NES technology can be performed through a procedure as shown in Fig. 1. Examples of NES solutions that can be performed by a procedure as shown in Fig. 1 are as follows.

[0071] - Intra-system energy saving solution: A RAN node may request a neighboring RAN node to switch at least one SSB beam into its inactive cell, or perform paging using a limited set of beams to an inactive terminal (e.g., a stationary terminal).

[0072] - Inter-system energy saving solution: An NG-RAN node owning a capacity booster cell can autonomously switch the cell to an inactive state.

[0073] -SSB-less SCell solution: If no SSB or SMTC (SSB-based RRM measurement timing configuration) settings are provided for the SCell, the terminal can obtain timing reference and AGC sources from other serving cells. In FR1 or FR2, the base station can set up intra-band CA or inter-band CA including the SCell without SSB transmission, in which case SSB / SIB transmission can be triggered by the terminal's WUS (wake-up signal). Accordingly, as the period of common channels / signals such as SSB increases, the base station can remain in a sleep state for a longer time.

[0074] - Cell DTX / DRX Solution: To reduce the downlink transmit / uplink receive activity time of a base station, periodic cell DTX / DRX patterns (e.g., active and inactive periods) may be set commonly for terminals within a cell having the corresponding feature. Here, the cell DTX pattern and the cell DRX pattern may be set and activated separately, and up to two cell DTX / DRX patterns may be set per MAC entity. When cell DTX is set and activated, at least one of monitoring SPS opportunities or PDCCH monitoring may be suspended during the cell DTX inactive period. When cell DRX is set and activated, at least one of transmitting from CG resources or SR transmitting may be suspended during the cell DRX inactive period. Cell DTX / DRX may be enabled / disabled via RRC signaling or L1 group common signaling.

[0075] Parameters such as active duration and cycle may be set for the cell DTX / DRX. The active duration is the period during which the terminal waits to transmit an SR or CG after receiving a PDCCH or SPS opportunity, and the cycle specifies the periodic repetition of the active duration and the inactive duration. When both the cell DTX and cell DRX are set, parameters such as the active duration and cycle are common. If the base station recognizes an emergency call or public safety-related service (e.g., MPS or MCS), the network may release or disable the cell DTX / DRX settings so as not to affect the service. Additionally, at least some overlap is required between the active duration of the terminal's connected mode DRX and the active duration of the cell DTX / DRX. For example, the period of the terminal's connected mode DRX may be a multiple of the cell DTX / DRX period, or vice versa.

[0076] - Conditional Handover (CHO) Solution: A CHO procedure, performed in such a way that the execution of a handover is determined by the terminal, is used while NES technology is applied (e.g., when a cell enables or disables Cell DTX / DRX). In this case, the terminal may use an NES-specific CHO event to execute a CHO for a candidate cell, and as an additional triggering condition for this, the reception of a DCI that enables CHO condition(s) set as an NES event indication may be applied.

[0077] - Spatial and power domain adaptation solution: To support the gNB for transceiver muting and / or transmission power adaptation, the terminal may be configured to report multiple CSI entries in the CSI report based on multiple sub-configurations. Each sub-configuration corresponds to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a data channel (e.g., PDSCH) and a power offset between CSI and RS. Depending on the application of the spatial and power domain adaptation solution, CSI configuration, measurement, and / or reporting behavior may be affected.

[0078] Cell DTX / DRX

[0079] Base station DTX / DRX was proposed for NES purposes to operate the base station in sleep mode for a relatively long period without frequent wake-ups. By configuring the cell DTX and setting the on-duration of the terminals' C-DRX within the active period of the cell DTX, the base station can reduce energy consumption by utilizing DTX transmission under low system load conditions.

[0080] Figure 2 illustrates an example of a procedure for cell DTX / DRX operation.

[0081] Referring to FIG. 2, the base station transmits system information to the terminal, and the terminal checks information related to cell DTX / DRX. For example, the system information may include MIB, SIB1, etc. In relation to NES technology, MIB may include information related to cell barring (e.g., cellBarred), and SIB1 may include information related to the cell barring status (e.g., cellBarredNES). Specifically, if cellBarred included in the MIB is set to a value indicating that it is not barred (e.g., notBarred), the terminal may determine that the cell is not barred, regardless of whether it supports NES cell DTX / DRX. Conversely, if cellBarred included in the received MIB is set to a value indicating that the cell is barred (e.g., barred), a terminal that does not support NES cell DTX / DRX may determine that the cell is barred. However, if the terminal has the capability to support NES cell DTX / DRX, the terminal checks SIB1 to determine the cell barring status. If cellBarred in the MIB is set to barred and cellBarredNES is absent in SIB1, a terminal supporting NES cell DTX / DRX may treat the cell as blocked and perform cell reselection to another cell. On the other hand, if cellBarred in the MIB is set to barred and cellBarredNES is included in SIB1, a terminal supporting NES cell DTX / DRX may determine that the cell is not blocked.

[0082]

[0083] In the case of FIG. 2, the terminal has the capability to support NES cell DTX / DRX, and it is assumed that the cellBarred in the MIB is set to notBarred or the cellBarred in the MIB is set to barred, and the cellBarredNES in SIB1 is included. Accordingly, the terminal can perform a random access procedure to connect to the base station and then perform communication. At this time, the base station performs a cell DTX / DRX operation and transmits configuration information related to the cell DTX / DRX operation to the terminal. The configuration information related to the cell DTX / DRX operation (e.g., CellDTXDRX-Config) includes at least one parameter related to the cell DTX / DRX, and may include, for example, at least one of an on-duration timer, a cycle start offset, a slot offset, a configuration type (e.g., DTX, DRX, or DTX-DRX), and an activation state of the DTX / DRX (e.g., active, inactive). In addition, the configuration information may further include information for receiving and interpreting control information related to cell DRX / DRX (e.g., DCI-related information).

[0084]

[0085]

[0086] Subsequently, the base station transmits control information related to cell DTX / DRX to the terminal. The control information related to cell DTX / DRX may include DCI having a specified format (e.g., format 2_9). When an operation for a serving cell is configured according to at least one of cell DTX operation and cell DRX operation by configuration information (e.g., cellDTXDRX-Config), the terminal can identify a set of search spaces (e.g., Type3-PDCCH CSS set) for monitoring PDCCHs that transmit control information of the specified format during the active time through upper-level parameters (e.g., SearchSpace), and obtain the location of information regarding the serving cell within the control information through upper-level parameters (e.g., positionInDCI-cellDTRX). Then, the terminal can obtain the control information based on the identified set of search spaces and location.

[0087] Control information related to cell DTX / DRX may be used to indicate the activation or deactivation of cell DTX and / or cell DRX, and / or to provide an NES-mode indicator, and may include, for example, at least one block including a cell DTX / DRX indicator and an NES-mode indicator. In this case, when the serving cell is set to a supplementary uplink (SUL) carrier, the indication for the activation or deactivation of cell DRX by the cell DTX / DRX indicator may be applied to both the UL carrier and the SUL carrier.

[0088]

[0089] Subsequently, the terminal and the base station can communicate based on the cell DTX / DRX. Specifically, the base station can turn the transmission and reception of signals on or off according to the settings related to the cell DTX / DRX, and accordingly, the terminal can selectively monitor signals from the base station. During DTX-OFF, the base station enters sleep mode to reduce energy consumption. At this time, the base station DTX cycle can be aligned with the terminal DRX cycle. The base station DTX-ON can fully cover the terminal's DRX-ON. Furthermore, the base station can align the transmission of Xn / NG with the transmission of Uu for NES purposes. The DTX / DRX mechanism triggers the switching of reference signal resource set groups, and the base station can perform dormancy-like behavior, such as transmitting SSB, SIB, and CSI-RS sparingly or not transmitting them at all, to reduce energy consumption. The terminal can receive downlink signals / channels sparingly or not receive them at all, depending on the base station's settings. Once the base station DTX / DRX operation is triggered, during the DTX / DRX OFF period, the terminal can discontinuously receive the corresponding CSI-RS, SSB, or PDCCH.

[0090] Network Energy Saving Technology (Rel-19)

[0091] In 3GPP NR release 19, a work item titled “Enhancements of network energy savings for NR” was additionally approved. Specifically, as shown in Table 6, the following enhancement techniques are being considered in 3GPP NR release 19.

[0092]

[0093] On-demand SSB

[0094] Through Objective 1 in Table 6 above, a method to reduce energy consumption can be discussed in which the base station transmits an SSB to a specific cell through an on-demand SSB process and does not transmit an SSB to that cell when there is no on-demand SSB process. In existing NR systems, it was difficult to reduce energy consumption even when the base station had no data to receive or send, as SSBs had to be transmitted periodically at all times for purposes such as time / frequency synchronization or RRM measurement. Considering this, the base station can reduce energy consumption by not performing SSB transmission and only performing SSB transmission when an on-demand SSB process is involved.

[0095] On-demand SIB1 transmission

[0096] Through Objective 2 in Table 6 above, a method to reduce energy consumption can be discussed in which the base station transmits a SIB1 for a specific cell through an on-demand SIB1 process and does not transmit a SIB1 for that cell when there is no on-demand SIB1 process. In existing NR systems, it was difficult to reduce energy consumption even when the base station had no data to receive or send because it was always necessary to periodically provide a SIB1 containing system information, random access information, etc., for initial access or idle mode terminals to access a cell. Considering this, the base station can reduce energy consumption by not performing SIB1 transmission and only performing SIB1 transmission when an on-demand SIB1 process is involved.

[0097] Adaptation of common signal / channel transmissions

[0098] Through Objective 3 in Table 6 above, a method to reduce energy consumption by controlling common signal / channel transmissions such as SSB, PRACH, and paging can be discussed. As with Objective 1 in Table 6, completely turning off the SSB can significantly reduce the energy consumption of the base station; however, if there is no SSB performing functions such as time / frequency synchronization or RRM measurement, stable operation for the corresponding cell may not be guaranteed from the terminal's perspective. Considering this, the energy saving effect of the base station can be achieved by changing the transmission pattern of the SSB (e.g., transmission period, period per SSB candidate index(es), SSB candidate index(es) transmitted within one transmission period, transmission power, etc.) according to the situation.

[0099] In the case of PRACH resources, in the case of contention-based random access, energy consumption can increase because the base station always attempts to receive from the configured PRACH resources since it is unknown when the terminal will transmit PRACH. Considering this, the energy of the base station can be saved by applying methods to adjust the amount of PRACH resources (e.g., adjusting the period of the PRACH resources, adjusting the amount of resources by pre-configuring PRACH resource set #1 and set #2 and giving instructions such as whether to turn on only one set or both sets, or providing the amount of PRACH resources corresponding to each SSB index uniformly or non-uniformly).

[0100] In the case of paging, conventionally, paging frames (PF) and / or paging occasions (PO) were distributed along the time axis within the DRX cycle (or paging cycle), and terminals attempted to receive paging at specific PF / POs derived from their ID-based formulas. From the base station's perspective, if it intended to transmit paging to multiple terminals simultaneously, it was necessary to transmit paging while frequently breaking the data. To reduce the resulting energy consumption of the base station, it is possible to consider placing the PF and / or PO for paging reception as close to the time axis as possible, or placing them using different frequency axis resources within the same timeframe.

[0101] In this specification, when considering a method to change the SSB transmission cycle for network energy saving, we propose a method for setting the number of Paging Frames within a DRX cycle according to the SSB transmission cycle.

[0102] According to the standard specification (e.g., 3GPP TS 38.331), when the paging search space where the paging frame (PF) is located is Control Resource Set #0 (CORESET #0) and the multiplexing pattern between the SSB block and CORESET is 2 or 3, the candidate(s) that can be indicated by the number of PFs according to the period of the SSB are defined as shown in Table 7 below.

[0103]

[0104] As can be seen from Table 7 above, the value that can be indicated by the number of PFs is defined to increase as the period of the SSB becomes shorter, and the value that can be indicated by the number of PFs is defined to decrease as the period of the SSB becomes longer. In this case, the number of PFs is determined by a combination of the DRX cycle 'T' and the parameter 'N' value, which represents the total number of PFs within the DRX cycle.

[0105] For example, if N is set to 'half T', the number of PFs N is ' It becomes half the size of the DRX cycle. In other words, half of the T System Frame Numbers (SFNs) in the DRX cycle become the number of PFs.

[0106] For example, if N is set to 'oneT', the number of PFs N is ' It becomes equal to the size of the DRX cycle. In other words, all T SFNs within the DRX cycle become PFs.

[0107] In other words, when the DRX cycle is the same, the case where N is set to 'oneT' has a larger PF number than the case where N is set to 'halfT'.

[0108] Meanwhile, methods for base stations (or gNBs) to adapt the SSB period to obtain Network energy saving (NES) gain are being considered; however, changing the SSB period in this way may result in limitations on the parameters that the PF can have depending on the SSB period. For example, if the SSB period is initially 5ms or 10ms and then increases to 20ms, according to the aforementioned specifications, the PF value N can no longer be set to the 'oneT' value. Therefore, when a base station adapts the SSB period for NES purposes, the number of PFs can be set / defined through the following proposed methods.

[0109] Method 1. A method in which the base station sets / instructs whether to change the PF number N value along with the SSB cycle within a specific cell.

[0110] In Method 1, when the base station changes the SSB period within a specific cell, a method may be considered in which the base station sets / instructs the terminal whether to change the PF number N value along with the SSB period.

[0111] For example, when a base station intends to change the SSB cycle, if it determines that there is no problem even if the PF number N previously instructed by the base station is not changed, the base station may set / instruct the terminal via higher layer signaling so that the PF number N is not changed even if the SSB cycle is changed. Consequently, if the base station sets / instructs so that the previously instructed PF number N is not changed regardless of the change in the SSB cycle, the PF number N is not changed even if the SSB cycle changes, so the terminal can be expected to use the PF value / PO value, etc. previously set / instructed via higher layer signaling as is.

[0112] Conversely, if the base station determines that it needs to change the PF number N as it changes the SSB cycle, the base station may set / instruct the terminal via higher layer signaling to change the PF number N as the SSB cycle changes. At this time, the base station may additionally set / instruct the terminal on how the PF number N will be changed.

[0113] As a specific example, when the SSB period shortens from P1 (e.g., 40ms) to P2 (e.g., 20ms), the base station can set / instruct the terminal to increase the PF number N value from N1 (e.g., 'quarterT') to N2 (e.g., 'halfT').

[0114] As another specific example, when the SSB period is extended from P2 (e.g., 20ms) to P1 (e.g., 40ms), the base station can set / instruct the terminal to decrease the PF number N value from N2 (e.g., 'halfT') to N1 (e.g., 'quarterT').

[0115] As a specific example, as the rate at which SSB bursts are transmitted changes as the SSB cycle changes, the value of the PF number N can also change at the same rate. According to this, there is an advantage that the number of PF / PO per number of SSB bursts can be maintained within a specific time interval (e.g., DRX cycle T).

[0116] As another example, a method may be considered in which a base station pre-allocates the PF number N value in a 1:1 ratio for multiple SSB cycles. Alternatively, a method may be considered in which a base station pre-allocates the PF number N value in an M:1 ratio (where M is a natural number greater than 1) for multiple SSB cycles.

[0117] As a specific example, a base station can set / instruct the terminal to set / instruct the PF number N value as {oneT, oneT, halfT, quarterT, oneEighthT, oneSixteenthT} for each SSB period {5ms, 10ms, 20ms, 40ms, 80ms, 160ms} through higher layer signaling.

[0118] As a specific example, the base station may pre-configure / instruct the terminal with SSB period candidate(s) that can be configured / instructed via RRC, and during SSB adaptation, one of the pre-configured candidate(s) may be configured / instructed to the terminal via RRC, MAC control element (CE), and / or DCI, etc.

[0119] As a specific example, SSB period candidate(s) and PF number N value (and / or paging parameters (e.g., number of POs, DRX cycle, etc.)) may be defined by being paired in advance. When a terminal receives information related to the pairing and subsequently receives / is instructed by a base station to indicate that the SSB period has changed, it may determine / use the PF number N value paired with the changed SSB period instead of the existing PF number N value.

[0120] For example, a terminal that is set / instructed to change the number of PF N when the SSB cycle is changed from a base station can determine the value of the number of PF N according to a pre-set or defined method as in the examples described above, and accordingly, can newly determine the PF / PO location that the terminal needs to monitor.

[0121] As another example, when a base station sets / instructs a change in the SSB cycle using RRC, MAC-CE and / or DCI, etc., the base station may separately set / instruct the terminal i) whether to change the SSB cycle and ii) the value of the number of PF N to be changed according to the changed SSB cycle (and / or paging parameters (e.g., number of POs, DRX cycle, etc.)).

[0122] As another example, a method may be considered in which the base station directly provides parameters for an additional SSB (additional SSB) from the existing SSB (default SSB) to change the SSB cycle.

[0123] As a specific example, the cycle of an additional SSB can be set / instructed within the default SSB through the PSS / SSS sequence and / or PBCH payload, etc.

[0124] As a specific example, the number of beams and beam patterns to be used by the additional SSB can be set / instructed separately.

[0125] As a specific example, if the base station does not separately specify the number of beams and beam pattern to be used by the additional SSB, the number of beams of the additional SSB can be set to be the same as the number of beams of the default SSB, and the beam pattern of the additional SSB can be set to be the same as the beam pattern of the default SSB.

[0126] As a specific example, when a terminal is set / instructed to set the cycle of an additional SSB, a new PF / PO location that the terminal needs to monitor can be determined by applying the corresponding PF number N value (and / or paging parameter (e.g., number of POs, DRX cycle, etc.)).

[0127] Method 2. A method for pre-setting / indicating the SSB period and PF number N to be used for NES mode and non-NES mode, respectively.

[0128] To obtain NES gain, a base station can set a long period for the base station to sleep by setting the period of SSB / PRACH / Paging Frames, etc. In this case, the mode for the period during which the base station sleeps can be called NES mode. On the other hand, if the base station always operates in NES mode, a large delay may occur when a terminal performs the initial access procedure. Therefore, if the number of terminals attempting to perform the initial access procedure increases, the base station can stop NES mode and switch to non-NES mode, thereby setting the period of SSB / PRACH / Paging Frames, etc. to a short period.

[0129] In the above scenario, a method may be considered in which the base station pre-sets / instructs the terminal via higher layer signaling i) a set of SSB period and PF number N values ​​to be used in NES mode and ii) a set of SSB period and PF number N values ​​to be used in non-NES mode.

[0130] For example, a base station may set / instruct a terminal to use an SSB period P1 and a PF number N value N1 as a set, such as {P1, N1}. In a similar manner, a base station may set / instruct a terminal to use an SSB period P2 and a PF number N value N2 as a set, such as {P2, N2}.

[0131] As a specific example, since the time interval during which the base station can sleep must be long in NES mode, the SSB period P1 to be used in NES mode can be set to be larger than the SSB period P2 to be used in non-NES mode (P1 > P2). In a similar manner, the number of PFs N1 to be used in NES mode can be set to be smaller than the number of PFs N2 to be used in non-NES mode (N1 <N2). 달리 표현하면, NES mode에서의 PF들 사이의 간격이 non-NES mode에서의 PF들 사이의 간격보다 크게 설정될 수 있다.

[0132] For example, a base station may be defined to set / instruct a terminal to set a set of SSB periods and PF numbers {P1, N1} to be used in NES mode and a set of SSB periods and PF numbers {P2, N2} to be used in non-NES mode, and then the terminal may be configured to switch the parameter set according to the base station's NES mode change.

[0133] As a specific example, the base station can explicitly set / instruct the terminal via L1 / L2 signaling that it has changed from NES mode to non-NES mode (or from non-NES mode to NES mode).

[0134] As a specific example, a base station can configure or instruct a terminal to change the SSB cycle through L1 / L2 signaling, etc. In this case, the terminal can determine whether the current base station mode is NES mode or non-NES mode based on the configured or instructed SSB cycle, and can be configured to switch the existing parameter set according to the base station mode determined by the terminal.

[0135] For example, if a base station intends to set the number of PFs per DRX cycle to be the same regardless of whether it is in NES mode or non-NES mode, the base station may set / instruct the terminal to set N1 and N2 to the same value.

[0136] Method 3. Always setting the PF number N to the minimum value for NES gain

[0137] Since the purpose of the base station adapting the SSB period is to obtain NES gain, a method may be considered in which the base station sets / instructs the terminal to the smallest value of the PF number N in order to obtain NES gain.

[0138] For example, if the PF number N value is set to the smallest value as defined in existing standard specifications, the base station can set / instruct the terminal to set the PF number N value to 'oneSixteenthT'.

[0139] Meanwhile, in a future release, there is a possibility that a value smaller than 'oneSixteenthT', which is the minimum PF number defined in the existing standard specification (e.g., 'oneThirty-secondT', 'oneSixty-fourthT', etc.) will be introduced. In this case, the PF number N value can be set / indicated as the smallest value among the defined parameters.

[0140] Alternatively, when the base station operates in NES mode, a separate PF number N value is not set or specified, and the smallest N value may be defined and used as the default value.

[0141] For example, the terminal can expect that the PF number N value will always remain at the minimum value even if the SSB cycle from the base station changes.

[0142] As a specific example, if the cell initially provides information that it performs SSB adaptation, PRACH adaptation, and / or paging enhancement for NES, and the base station sets / instructs the terminal to set the PF number N value to the minimum value among defined values, the terminal can expect that the PF number N value will not change and will always remain at the minimum value even if the SSB cycle changes, and can operate based on the PF number N value set to the minimum value.

[0143] Method 4. A method in which the default SSB and additional SSB are set / instructed, and the PF number N value is determined accordingly.

[0144] A method may be considered in which the base station operates in non-NES mode by setting a default SSB with a long period to obtain NES gain (or to operate in NES mode) and activating / deactivating additional SSBs available as needed. To this end, the base station can fundamentally configure the default SSB configuration via higher layer signaling. Additionally, it can set / instruct the terminal to configure one or more additional SSBs via higher layer signaling.

[0145] For example, an index may be assigned to the configuration for each additional SSB, and the base station may set / instruct one or more configuration indices to the terminal via RRC / MAC-CE / DCI, etc. The terminal may determine that an additional SSB corresponding to the configuration index has been additionally activated in addition to the existing default SSB.

[0146] For example, a method may be considered in which i) one or more additional SSB configuration indices and ii) one or more PF number N values ​​(and / or paging parameters (e.g., number of POs, DRX cycles, etc.)) are pre-paired and defined.

[0147] As a specific example, the PF number N value can be predefined as {halfT, quarterT, oneEighthT, oneSixteenthT} for each additional SSB configuration index {0, 1, 2, 3}. The terminal receives information regarding the additional SSB configuration index and the PF number N value that are pre-paired in this way, and can determine that a specific additional SSB has been activated by setting / instructing a specific additional SSB configuration index from the base station. Additionally, the terminal can use the PF number N value (and / or paging parameters (e.g., number of POs, DRX cycle, etc.) according to the SSB cycle (SSB cycle according to the default SSB and additional SSB(s)) that has been changed as the specific additional SSB is activated.

[0148] For example, if a base station sets the period of the default SSB to be long and the interval between Paging Frames to be relatively shorter than the period of the default SSB, some Paging Frames may be allocated near the default SSB in the time domain, while some Paging Frames may be allocated far away from the default SSB. This will be explained in detail with reference to FIGS. 3 and 4.

[0149] FIG. 3 is a diagram illustrating the transmission interval of default SSBs and the configured Paging Frames according to an embodiment of the present specification.

[0150] Referring to Fig. 3, when the period of the default SSB is 40ms, the DRX cycle T is 32 frames, and the PF number N value is 'oneSixteenthT', the actual Paging Frames are 2 per 32 frames and can be arranged at intervals of 16 frames. In this case, some Paging Frames are placed close to the default SSB, while some Paging Frames are placed far from the SSB.

[0151] As in the example described above, when some PFs are assigned far from the SSB, when a terminal selects the best downlink beam (best DL beam) to receive the SSB and attempts to receive paging in the same DL beam direction, a terminal assigned to a PF located close to the SSB may have a relatively smaller change in the communication environment compared to a terminal assigned to a PF far from the SSB, and thus may be more advantageous for receiving paging. Therefore, a method may be considered in which the base station performs an operation to ensure fairness between terminals by additionally transmitting additional SSBs to the terminals between the default SSBs.

[0152] For example, the period of the additional SSB can be set shorter than the period of the default SSB. Specifically, referring to FIG. 3, for example, the period of the additional SSB can be set to 10ms, and the additional SSB can be set so that only the default SSB is transmitted in the time domain overlapping with the default SSB, so that the additional SSB is not transmitted.

[0153] An example of additional SSBs being transmitted between default SSBs according to the methods described above is shown in Fig. 4.

[0154] FIG. 4 is a diagram illustrating an additional SSB that is additionally transmitted between default SSBs according to an embodiment of the present specification.

[0155] Referring to Fig. 4, it can be seen that the period of the default SSB ('SSB' in Fig. 4) is set to 40ms as in Fig. 3, and the period of the additional SSB ('A-SSB' in Fig. 4) is set to 10ms.

[0156] At this time, since the period of the additional SSB is 10ms, the transmission interval of the additional SSB that must be transmitted as the fourth overlaps with the transmission interval of the second default SSB in the time domain. In this case, according to the methods described above, the transmission of the additional SSB that must be transmitted as the fourth is dropped, and only the second default SSB can be transmitted in the time domain as shown in Fig. 4.

[0157] For example, a method in which additional SSB is not transmitted by the base station can be considered.

[0158] As a specific example, referring to Fig. 4, an A-SSB is located in the frame immediately preceding the second PF, and another A-SSB is located in the frame 10ms prior to that. In this case, the terminal can receive the A-SSB in the frame immediately preceding the second PF (the second A-SSB in Fig. 4) and select the best DL beam, and thus receive paging at the second PF, so the terminal can not use the A-SSB transmitted in the frame prior to the second A-SSB (the first A-SSB in Fig. 4).

[0159] In the above scenario, the base station can be configured not to transmit some A-SSBs to the terminal, and the terminal can also expect that some A-SSBs will not be transmitted. An example of this is illustrated in FIG. 5.

[0160] FIG. 5 is a drawing illustrating the exclusion of some additional SSBs according to an embodiment of the present specification.

[0161] As with the A-SSB between the second PF and the third PF in Fig. 5, additional SSBs can be defined such that there is at most one additional SSB between consecutive PFs.

[0162] Two or more additional SSBs may exist between consecutive PFs, such as the A-SSBs between the first PF and the second PF in FIG. 5. In this case, the base station may set i) to transmit to the terminal an additional SSB (e.g., the first A-SSB in FIG. 5) which is configured to be transmitted in the time domain immediately preceding the second PF among the consecutive PFs, but ii) to skip or drop one or more additional SSBs (e.g., the dropped A-SSB in FIG. 5) that precede the transmitted additional SSB among the two or more additional SSBs so that they are not transmitted. In other words, the terminal can expect that one or more additional SSBs (e.g., the dropped A-SSB in FIG. 5) that precede the transmitted additional SSB among the two or more additional SSBs will not be transmitted.

[0163] For example, when an additional SSB is activated, the PF number N value (and / or paging parameter (e.g., number of POs, DRX cycles, etc.)) can be set to remain fixed without changing.

[0164] As another example, paging parameters can be pre-defined by pairing them with the period values ​​of the additional SSB according to the methods described above, and a method can be considered in which paging parameters are applied differently depending on the changed period of the additional SSB.

[0165] For example, a method may be considered in which the period of an additional SSB is not set / determined as one of the periods available to the legacy SSB according to the existing standard specifications, but is set / determined as an interval equal to the interval between PFs determined by the paging parameter.

[0166] As a specific example, when an additional SSB is set / instructed to be activated, the period of the additional SSB can be defined so that the additional SSB is transmitted in the frame immediately preceding the frame in which the legacy PF is set / assigned. In this case, a method may be considered in which the base station sets / instructs a frame offset value from the start of the frame in which the legacy PF is set to the start of the frame in which the additional SSB is located.

[0167] As a specific example, when a PF is set / assigned every 16 frames, the period of an additional SSB can also be set to 16 frames. In this case, the additional SSB can be set / defined to be located in a frame that precedes the frame in which the PF is located by a specific time interval. Additionally, the base station can set / instruct the terminal to set a frame offset from the start time of the frame in which the legacy PF is set to the start time of the frame in which the additional SSB is located. A specific example of this is shown in Fig. 6.

[0168] FIG. 6 is a diagram illustrating an offset between a Paging Frame and an additional SSB according to an embodiment of the present specification. Specifically, FIG. 6 illustrates an example where the period of the additional SSB is set to be equal to the interval between the PFs.

[0169] As in the first A-SSB (dropped A-SSB) of Fig. 6, when the offset (e.g., frame offset) between the Paging Frame and the additional SSB is set to a specific value, a legacy SSB may already be transmitted within K frames (where K is configurable) before the frame where the specific additional SSB is to be located. In this case, the specific additional SSB may be dropped and not transmitted, and only the existing SSB may be transmitted.

[0170] As a specific example, if the frame offset between the Paging Frame and the additional SSB is set to 2 frames and K is set to 3, i) the additional SSB may be transmitted 2 frames before the PF, and ii) if there is an existing SSB (legacy SSB) within 3 frames prior to the frame in which the specific additional SSB is set to be transmitted, the specific additional SSB may be dropped and not transmitted.

[0171] According to one embodiment, the methods described above were operations for changing the PF number N value according to the change in the SSB period, but the proposed methods can also be applied to operations for changing the PF number N value according to the change in the PRACH period.

[0172] For example, the PF number N value can be set to increase as the PRACH period becomes shorter, and the PF number N value can be set to decrease as the PRACH period becomes longer.

[0173] As another example, the PRACH period and the PF number N value can be paired as a set for NES mode and non-NES mode, respectively, and can be defined so that the terminal selects an appropriate PF number N value according to the PRACH period to determine the location of the PF / PO that the terminal needs to monitor.

[0174] For example, in addition to changing the PF number N value, paging parameters such as the number of POs and / or DRX cycles can also be changed.

[0175] Although the embodiments of this specification describe NES UEs, NES ROs, and / or NES cells, etc., as examples of systems supporting network energy saving features, the embodiments of this specification may also be applied to systems supporting technologies similar to NES. For example, systems supporting technologies similar to NES may include systems supporting coverage enhancement, wake-up signals, A-IoT (Ambient Internet of Things), and / or duplex enhancement.

[0176] Methods, embodiments, and / or descriptions for implementing the methods proposed in this specification (e.g., Method 1, Method 2, Method 3, and / or Method 4) may each be applied separately or one or more methods (or embodiments or descriptions) may be applied in combination.

[0177] In terms of implementation, the operations of the base station / terminal according to the embodiments described above (e.g., operations based on at least one of methods 1 to 4) can be processed by the device of FIG. 9 described later (e.g., the processor (110, 210) of FIG. 9).

[0178] In addition, the operations of the base station / terminal according to the above-described embodiment (e.g., operations based on at least one of methods 1 to 4) may be stored in memory (e.g., memory (140, 240) of FIG. 9) in the form of instructions / programs (e.g., instruction, executable code) for driving at least one processor (e.g., processor (110, 210) of FIG. 9).

[0179] The embodiments described above will be explained in detail below with reference to FIGS. 7 and FIGS. 8 regarding the operation of the terminal and base station. The methods described below are distinguished only for convenience of explanation, and it is understood that a part of one method may be substituted with a part of another method or combined with one another and applied.

[0180] FIG. 7 is a flowchart illustrating a method according to one embodiment of the present specification.

[0181] Referring to FIG. 7, a method according to one embodiment of the present specification includes a step of receiving information related to a cell (S710) and a step of receiving paging (S730).

[0182] In step S710, the terminal receives information related to the cell from the base station.

[0183] The information related to the cell includes i) the periodicity of the first Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block (SSB) and ii) settings related to paging.

[0184] The above settings related to paging include information indicating whether the number of paging frames (PF) is changed based on the change in the period of the first SSB.

[0185] According to one embodiment, the setting associated with the paging may include one or more candidates that can be set for the number of the PFs.

[0186] For example, the number of the above PFs can be set to any one of the above one or more candidates.

[0187] For example, the above settings related to paging may include nAndPagingFrameOffset.

[0188] For example, the number of the above PFs can be expressed as a discontinuous reception cycle (DRX cycle) 'T' and a parameter 'N' representing the total number of PFs within the DRX cycle.

[0189] For example, the above one or more candidates may include oneT, halfT, quarterT, oneEighthT and / or oneSixteenthT.

[0190] For example, the above one or more candidates may further include oneThirty-secondT and / or oneSixty-fourthT.

[0191] As a specific example, if N is set to 'half T', the number of the above PFs is ' It can be determined as '. In other words, the number of the above PFs can be determined as half the number of T System Frame Numbers (SFNs) in the DRX cycle.

[0192] As another specific example, if N is set to 'oneT', the number of the above PFs is ' It can be determined as. In other words, the number of the above PFs can be determined by the total number of T SFNs in the DRX cycle.

[0193] According to one embodiment, the information indicating whether the number of the PFs is changed may include information indicating a change in the number of the PFs based on one or more candidates for the period of the first SSB in which the number of the set PFs is changed.

[0194] For example, the above one or more candidates may be determined based on the period of the above first SSB.

[0195] For example, the number of the above one or more candidates may be defined to increase as the period of the first SSB becomes shorter. Conversely, the number of the above one or more candidates may be defined to decrease as the period of the first SSB becomes longer.

[0196] As a specific example, if the period of the first SSB is 5ms or 10ms, the one or more candidates may include oneT, halfT, quarterT, oneEighthT, and oneSixteenthT.

[0197] As a specific example, if the period of the first SSB is 20ms, the one or more candidates may include halfT, quarterT, oneEighthT, and oneSixteenthT.

[0198] As a specific example, if the period of the first SSB is 40ms, the one or more candidates may include quarterT, oneEighthT, and oneSixteenthT.

[0199] As a specific example, if the period of the first SSB is 80ms, the one or more candidates may include oneEighthT and oneSixteenthT.

[0200] As a specific example, if the period of the first SSB is 1600ms, the one or more candidates may include oneSixteenthT.

[0201] To provide a specific explanation of the information indicating whether the number of the above PFs has changed, the case where the period of the existing first SSB is 10ms and the number of the existing PFs is oneT is explained as an example. When the period of the first SSB is changed from 10ms to 20ms, the one or more candidates may include halfT, quarterT, oneEighthT, and oneSixteenthT depending on the change in the SSB period. Therefore, since the one or more candidates no longer include oneT, the number of the PFs needs to be changed.

[0202] At this time, the information indicating whether the number of the above PFs is changed may include information instructing the terminal to change the number of the current PFs.

[0203] Alternatively, the information indicating whether the number of the above PFs is changed may further include information indicating a candidate among the one or more candidates for which the number of the above PFs is to be changed (e.g., any one of halfT, quarterT, oneEighthT, and oneSixteenthT).

[0204] As another example, a case may be considered where the period of the existing first SSB is 10ms and the number of existing PFs is halfT. When the period of the first SSB is changed from the existing 10ms to 20ms, the one or more candidates may include halfT, quarterT, oneEighthT, and oneSixteenthT depending on the change in the SSB period. In this case, since the terminal can still use the previously set halfT as the number of PFs, the number of PFs does not necessarily need to be changed.

[0205] At this time, the information indicating whether the number of the above PFs is changed may include information indicating that the terminal does not change the number of the current PFs. This embodiment may be based on Method 1 described above.

[0206] According to one embodiment, the number of the PFs may be changed based on the rate at which the period of the first SSB is changed.

[0207] For example, the number of the above PFs may change by the same ratio as the transmission rate of the set of SSBs (bursts) that changes according to the change in the period of the SSB. According to this, there is an advantage that the number of PFs and / or the number of Paging Occasions (POs) per number of SSB bursts within a specific time interval (e.g., DRX cycle T) can be maintained. This embodiment may be based on Method 1 described above.

[0208] According to one embodiment, the number of the PFs can be determined based on the period during which the first SSB and the second SSB are transmitted.

[0209] For example, the second SSB may refer to an SSB that is additionally transmitted in addition to the first SSB.

[0210] For example, information regarding the period of the second SSB may be included in the first SSB.

[0211] As a specific example, information regarding the period of the second SSB may be included in the PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal) sequence and / or PBCH payload within the first SSB.

[0212] As a specific example, the number of beams and beam patterns associated with the second SSB mentioned above can be set / instructed to the terminal via separate signaling.

[0213] As another specific example, the number of beams and / or the beam pattern associated with the second SSB may each be set to the same number of beams and / or beam pattern as the first SSB. This embodiment may be based on Method 1 described above.

[0214] According to one embodiment, the number of PFs determined based on the period of the first SSB and the second SSB may be a value that is pre-set or defined for each period of the second SSB.

[0215] For example, the number of the above PFs may be changed to a value that is pre-set or defined for each of the above 2 SSBs based on the above 2 SSBs. This embodiment may be based on the above-described method 4.

[0216] According to one embodiment, the period of the second SSB may be shorter than the period of the first SSB.

[0217] For example, the second SSB may be transmitted at a different time than when the first SSB is transmitted.

[0218] As a specific example, if the period of the second SSB is set so that the second SSB is transmitted during the time interval (e.g., frame) in which the first SSB is transmitted, the second SSB that overlaps with the first SSB may be set so that it is dropped and not transmitted. This embodiment may be based on the above-described method 4.

[0219] According to one embodiment, the period of the second SSB may be set so that two or more second SSBs are transmitted between two consecutive PFs.

[0220] For example, among the above two or more second SSBs, one or more second SSBs other than the second SSB immediately before the second PF may be dropped.

[0221] For example, if the cycle of the second SSB is set so that two or more second SSBs are transmitted between PFs, i) the nearest second SSB prior to the start of the time interval (e.g., frame) in which the PF is set may be set to be transmitted, and ii) the remaining one or more second SSBs may be set to be dropped and not transmitted. This embodiment may be based on the above-described method 4.

[0222] According to one embodiment, the period of the second SSB can be determined based on the positions of the set PFs.

[0223] For example, the period of the second SSB can be determined to be the same as the interval between two consecutive PFs.

[0224] For example, the period of the second SSB may be set so that the second SSB is transmitted a specific time interval (e.g., frame) ahead of the PF. This embodiment may be based on the above-described method 4.

[0225] According to one embodiment, the second SSB may be dropped based on the fact that the interval between the transmission time of the first SSB and the transmission time of the second SSB is within a certain time interval. In this case, the certain time interval may be a pre-set or defined value.

[0226] For example, if the first SSB is transmitted within a certain time interval from the point in time (e.g., frame) at which the second SSB is set to be transmitted, the second SSB may be dropped and not transmitted. This embodiment may be based on the above-described proposal 4.

[0227] According to one embodiment, the first SSB may be i) a third SSB related to Network Energy Saving (NES) and ii) a fourth SSB other than the third SSB.

[0228] For example, i) the third SSB may be associated with an NES mode, and ii) the fourth SSB may be associated with a non-NES mode.

[0229] For example, the number of the above PFs may be determined as i) a first number based on the third SSB or ii) a second number based on the fourth SSB.

[0230] For example, the second number may be equal to or less than the first number. This embodiment may be based on Method 2 described above.

[0231] According to one embodiment, the number of the PFs can be determined as the smallest candidate among the one or more candidates.

[0232] For example, the number of the above PFs can be determined as the smallest candidate among one or more candidates for the modified period of the first SSB.

[0233] As another example, the number of the above PFs can be fixed to the smallest candidate among the one or more candidates, regardless of the change in the period of the first SSB. This embodiment may be based on Method 3 described above.

[0234] In step S730, the terminal receives the paging.

[0235] Operations based on S710 to S730 described above can be implemented by the device of FIG. 9. For example, referring to FIG. 9, the terminal (200) can control one or more transceivers (230) and / or one or more memories (240) to perform operations based on S710 to S730.

[0236] The embodiments described above will be explained in detail below in terms of base station operation.

[0237] S810 to S830 described below correspond to S710 to S730 described in FIG. 7. Considering the above correspondence, redundant descriptions are omitted. The specific description of the base station operation described below may be replaced by the description / embodiment of FIG. 7 corresponding to the operation.

[0238] FIG. 8 is a flowchart illustrating a method according to another embodiment of the present specification.

[0239] Referring to FIG. 8, a method according to another embodiment of the present specification includes an information transmission step (S810) and a paging transmission step (S830) related to a cell.

[0240] In step S810, the base station transmits information related to the cell to the terminal.

[0241] The above information includes i) the periododicity of the first Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block (SSB) and ii) settings related to paging.

[0242] The above settings related to paging include information indicating whether the number of paging frames (PF) is changed based on the change in the period of the first SSB.

[0243] In step S830, the base station transmits the paging to the terminal.

[0244] Operations based on S810 to S830 described above can be implemented by the device of FIG. 9. For example, referring to FIG. 9, a base station (100) can control one or more transceivers (130) and / or one or more memories (140) to perform operations based on S810 to S830.

[0245] The operations / terms based on the embodiments described above are described assuming a 5G system. However, this is for the convenience of explanation and is not intended to limit the scope of application of the technical problems and means for solving problems to be solved by this specification to a specific system. The technical problems / technical issues / problems mentioned in this specification may exist in other systems (e.g., 6G systems). It is evident that the embodiments of this specification can be extended to solve problems that exist in other systems as well. Therefore, for the extended application of the embodiments of this specification to other systems, terms defined / described based on a 5G system may be replaced / changed with terms defined in said other systems (or generalized terms not specific to one system). For example, PRACH, PUSCH, PUCCH, or SRS may be replaced / changed to uplink signals (or uplink channels). For example, SSB, CSI-RS, PDSCH, and PDCCH may be replaced / changed to downlink signals (or downlink channels).

[0246] Hereinafter, an apparatus to which the embodiments of the present specification can be applied (an apparatus implementing the method / operation according to the embodiments of the present specification) will be described with reference to FIG. 9.

[0247] FIG. 9 is a drawing showing the configuration of a first device and a second device according to an embodiment of the present specification.

[0248] The first device (100) may include a processor (110), an antenna unit (120), a transceiver (130), and a memory (140).

[0249] The processor (110) performs baseband-related signal processing and may include an upper layer processing unit (111) and a physical layer processing unit (115). The upper layer processing unit (111) may process operations of the MAC layer, RRC layer, or higher upper layers. The physical layer processing unit (115) may process operations of the PHY layer. For example, if the first device (100) is a base station device in base station-terminal communication, the physical layer processing unit (115) may perform uplink reception signal processing, downlink transmission signal processing, etc. For example, if the first device (100) is a first terminal device in terminal-terminal communication, the physical layer processing unit (115) may perform downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, etc. In addition to performing baseband-related signal processing, the processor (110) may also control the overall operation of the first device (100).

[0250] The antenna section (120) may include one or more physical antennas, and if it includes multiple antennas, it may support MIMO transmission and reception. The transceiver (130) may include an RF (Radio Frequency) transmitter and an RF receiver. The memory (140) may store information processed by the processor (110) and software, operating systems, applications, etc. related to the operation of the first device (100), and may include components such as a buffer.

[0251] The processor (110) of the first device (100) may be configured to implement the operation of the base station in base station-terminal communication (or the operation of the first terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0252] The second device (200) may include a processor (210), an antenna unit (220), a transceiver (230), and a memory (240).

[0253] The processor (210) performs baseband-related signal processing and may include an upper layer processing unit (211) and a physical layer processing unit (215). The upper layer processing unit (211) may process operations of the MAC layer, RRC layer, or higher upper layers. The physical layer processing unit (215) may process operations of the PHY layer. For example, if the second device (200) is a terminal device in base station-terminal communication, the physical layer processing unit (215) may perform downlink reception signal processing, uplink transmission signal processing, etc. For example, if the second device (200) is a second terminal device in terminal-terminal communication, the physical layer processing unit (215) may perform downlink reception signal processing, uplink transmission signal processing, sidelink reception signal processing, etc. In addition to performing baseband-related signal processing, the processor (210) may also control the overall operation of the second device (210).

[0254] The antenna section (220) may include one or more physical antennas, and may support MIMO transmission and reception if it includes multiple antennas. The transceiver (230) may include an RF transmitter and an RF receiver. The memory (240) may store information processed by the processor (210) and software, operating systems, applications, etc. related to the operation of the second device (200), and may include components such as a buffer.

[0255] The processor (210) of the second device (200) may be configured to implement the operation of the terminal in base station-terminal communication (or the operation of the second terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0256] In the operation of the first device (100) and the second device (200), the details described in the examples of the present disclosure regarding the base station and terminal (or the first terminal and the second terminal in terminal-to-terminal communication) in base station-to-terminal communication may be applied in the same way, and redundant descriptions are omitted.

[0257] Here, the wireless communication technology implemented in the device of the present disclosure may include LTE, NR, and 6G, as well as Narrowband Internet of Things (NB-IoT) for low-power communication. For example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented according to standards such as LTE Cat NB1 and / or LTE Cat NB2, but is not limited to the names mentioned above.

[0258] Additionally or alternatively, the wireless communication technology implemented in the device of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented in at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the names mentioned above.

[0259] Additionally or generally, the wireless communication technology implemented in the device of the present disclosure may include at least one of ZigBee, Bluetooth, and a Low Power Wide Area Network (LPWAN) for low-power communication, but is not limited to the names mentioned above. For example, ZigBee technology can create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4 and may be referred to by various names.

Claims

In terms of method, A step of receiving information related to a cell from a base station, The information related to the cell includes i) the periododicity of the first Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block (SSB) and ii) settings related to paging; and The method includes the step of receiving the paging from the base station; A method characterized in that the above setting related to paging includes information indicating whether the number of paging frames (PF) is changed based on the change in the period of the first SSB. In Article 1, A method characterized in that the above setting related to paging includes one or more candidates that can be set for the number of above PFs. In Article 2, A method characterized in that the information indicating whether the number of the above PFs is changed includes information indicating a change in the number of the above PFs based on one or more of the candidates for the period of the first SSB in which the number of the set above PFs is changed. In Paragraph 3, A method characterized in that the number of the above PFs changes based on the rate at which the period of the above 1 SSB changes. In Paragraph 3, A method characterized in that the number of the above PFs is determined based on the period during which the first SSB and the second SSB are transmitted. In Article 5, A method characterized in that information regarding the period of the second SSB is included in the first SSB. In Article 5, A method characterized in that the number of PFs determined based on the periods of the first SSB and the second SSB is a value that is pre-set or defined for each period of the second SSB. In Article 5, A method characterized in that the period of the second SSB is shorter than the period of the first SSB. In Article 5, A method characterized in that the second SSB is transmitted at a different time than the time at which the first SSB is transmitted. In Article 5, The cycle of the above second SSB is set so that two or more second SSBs are transmitted between two consecutive PFs, and A method characterized by excluding (dropping) one or more second SSBs other than the second SSB located immediately before the second PF among the above two or more second SSBs. In Article 5, A method characterized in that the period of the second SSB is determined based on the positions of the set PFs. In Article 11, A method characterized in that the period of the second SSB is determined to be the same as the interval between two consecutive PFs. In Article 11, A method characterized by excluding (dropping) the second SSB based on the fact that the interval between the transmission time of the first SSB and the transmission time of the second SSB is within a certain time interval. In Article 1, The above-mentioned first SSB is i) a third SSB related to Network Energy Saving (NES) or ii) a fourth SSB other than the above-mentioned third SSB, and A method characterized in that the number of the above PFs is determined as i) a first number based on the third SSB or ii) a second number based on the fourth SSB. In Article 14, A method characterized in that the second number is equal to or less than the first number. In Article 2, A method characterized in that the number of the above PFs is determined as the smallest candidate among the one or more candidates. In a terminal (user equipment, UE), One or more transmitters and receivers; One or more processors; and One or more memories connected to the above one or more processors and storing instructions; comprising, A terminal characterized by the above instructions, based on execution by the one or more processors, causing the terminal to perform all steps of the method according to any one of claims 1 to 16. In a device comprising one or more memories and one or more processors connected to said one or more memories, A device characterized in that the one or more of the above memories store instructions that cause the device to perform all steps of the method according to any one of claims 1 to 16, based on execution by the one or more processors. In a non-transitory computer-readable medium storing instructions, A computer-readable medium characterized in that the instructions executable by one or more processors enable the terminal to perform all steps of the method according to any one of claims 1 to 16. In terms of method, A step of transmitting information related to a cell to a terminal, The information related to the cell includes i) the periododicity of the first Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block (SSB) and ii) settings related to paging; and The step of transmitting the paging to the terminal; comprising, A method characterized in that the above setting related to paging includes information indicating whether the number of paging frames (PF) is changed based on the change in the period of the first SSB. In the case of a base station, One or more transmitters and receivers; One or more processors; and It includes one or more memories connected to the above one or more processors and storing instructions, A base station characterized by the above instructions, based on execution by one or more processors, having the base station perform all steps of the method according to claim 20.

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