Wireless terminal, radio access network node, and method therefor

Abstract

This wireless terminal has a main transceiver and a low power consumption wake-up receiver. The wireless terminal records a minimization of drive tests (MDT) measurement result including a measurement result of a low power consumption wake-up related signal using the low power consumption wake-up receiver while at least the main transceiver is in an ultra-deep sleep power state. This may contribute, for example, to solving a problem related to achieving a low power consumption mechanism using a low power consumption wake-up signal (LP-WUS) and a low power consumption wake-up receiver (LP-WUR).

Description

Wireless terminal, radio access network node, and methods thereof

[0001] The present disclosure relates to wireless communication systems.

[0002] The 3rd Generation Partnership Project (3GPP®) is considering an ultra-low power mechanism or solution for Release 18 and beyond that can improve the energy efficiency of User Equipments (UEs) and support low latency (see, for example, Non-Patent Documents 1-15). This mechanism aims to achieve substantial gains compared to the UE power saving mechanisms introduced in 3GPP Releases 15, 16, and 17.

[0003] As described in Non-Patent Document 1, currently, when a UE is in the Radio Resource Control (RRC)_IDLE or RRC_INACTIVE state, the UE needs to periodically wake up once per Discontinuous Reception (DRX) cycle (i.e., paging cycle). Specifically, the UE needs to periodically monitor a Paging Occasion (PO) or Paging Early Indication (PEI) once per DRX or paging cycle. This behavior dominates the power consumption of the UE in the RRC_IDLE or RRC_INACTIVE state during periods when there is no signaling or data traffic. If the UE could wake up only when triggered by a paging event, power consumption could be dramatically reduced. To achieve this, the low-power mechanism under consideration uses a wake-up signal that triggers the Main Radio (MR) and a receiver capable of monitoring the wake-up signal with ultra-low power consumption.

[0004] The wake-up signal under consideration is referred to, for example, as a Low Power (LP) Wake-Up Signal (WUS) (LP-WUS). A low-power receiver capable of monitoring the LP-WUS and separate from the MR is referred to, for example, as a Low Power (LP) Wake-Up Receiver (LP-WUR), or LR for short for LP-WUR. The MR is a transceiver (transmit and receive module) for receiving NR signals and channels. It operates for data transmission and reception and can be turned off or set to deep sleep unless powered on. To distinguish it from the sleep and deep sleep states in DRX in RRC_IDLE and INACTIVE states supported by current UEs, the deep sleep state achieved by using the LP-WUS and LP-WUR is referred to, for example, as an ultra-deep sleep state. Note that the deep sleep state supported by current UEs is achieved by the PEI mechanism introduced in 3GPP Release 17.

[0005] Non-Patent Document 2 describes considerations related to LP-WUS and LP-WUR, including the receiver architecture of LP-WUR, signal design of LP-WUS, and Layer-1 (L1) procedures related to LP-WUS. LP-WUS-related L1 procedures include Radio Resource Management (RRM) measurements in RRC_IDLE and INACTIVE states and RRC_CONNECTED states, LP-WUR synchronization, LP-WUS monitoring, LP-WUS activation and deactivation procedures, and LP-WUS coverage-related procedures.

[0006] Regarding LP-WUS signal design, potential LP-WUS content for RRC_IDLE and INACTIVE includes information about which user the LP-WUS is targeting (e.g., UE-group, UE-subgroup, or UE-ID). In addition, potential LP-WUS content includes cell information, tracking area information, Radio Access Network (RAN) area information, System Information (SI) change indication, Earthquake and Tsunami Warning System (ETWS) Commercial Mobile Alert System (CMAS) information.

[0007] Regarding RRM measurements in RRC_IDLE and INACTIVE states, 3GPP will consider the feasibility of RRM measurements made by the LP-WUR for at least the serving or camping cell based on signals detected by the LP-WUR.

[0008] With regard to synchronization of the LP-WUR, there are several options for the synchronization signal used by the LP-WUR, including aperiodic signals transmitted as part of the LP-WUS, periodic signals transmitted separately from the LP-WUS, and combinations of these. The synchronization or reference signal for synchronization of the LP-WUR and for L1 measurements is called the LP Synchronization Signal (LP-SS) or LP Reference Signal (LP-RS).

[0009] Regarding LP-WUS coverage related procedures, 3GPP will consider a fallback mechanism whereby the MR switches to legacy operation when the channel conditions for LP-WUS are not sufficient (e.g., below a threshold).

[0010] Non-Patent Document 3-13 is a contribution submitted at a recent meeting of the 3GPP Technical Specification Group (TSG) Radio Access Network (RAN) Working Group #2 (WG2) (RAN2). Non-Patent Document 3 states that because the waveform handled by LP-WUR is different from that handled by MR, a different reference signal receivable by LP-WUR, i.e., LP-RS, must be used for RRM measurements by LP-WUR. Non-Patent Document 3 proposes that UEs should consider which types of RRM measurements, such as serving cell, intra-frequency, and inter-frequency, are performed using LP-WUR.

[0011] In addition, Non-Patent Document 3 proposes considering options for the UE to use RRM measurements from the LP-WUR together with legacy measurements during the cell reselection procedure. Specifically, even if the UE can perform RRM measurements using the LP-WUR, not all measurements are performed by the LP-WUR. For example, if neighboring cells do not transmit LP-RS (or LP-SS), measurements on those cells must be performed by the MR (i.e., legacy measurements). During cell reselection, the UE needs to compare the signal strength of receivable neighboring cells with that of the serving cell. Therefore, it is necessary to consider how the UE can perform cell ranking using two different types of RRM measurements. From the RAN2 perspective, it is desirable to have some kind of "mapping" that converts RRM measurements from the LP-WUR to the scale of legacy RRM measurements. Such a mapping could be either a predefined offset in the specification or a semi-static parameter that can be periodically calibrated based on measurements. Such a mapping would enable compatible and reliable comparison of measurements from the LP-WUR and the MR.

[0012] Non-Patent Document 4 states that different mechanisms need to be considered depending on whether the LP-WUS has full coverage or partial coverage. Full coverage means that the LP-WUS coverage is the same as or comparable to the coverage of existing reference signals (i.e., Secondary Synchronization Signal (SSS) or Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB)). Partial coverage means that the LP-WUS coverage is narrower than the coverage of existing reference signals. Partial coverage may also be referred to as different coverage or coverage mismatch. In the case of full LP-WUS coverage, the LP-WUS may be continuously available when the UE moves between cells. In this case, the UE's MR may be able to remain in ultra-deep sleep while moving in RRC_IDLE or RRC_INACTIVE state. Non-Patent Document 4 proposes to consider whether to use LP-WUS / SS-based measurements to perform cell reselection so that the UE's MR can maintain ultra-deep sleep as long as possible. On the other hand, in the case of LP-WUS partial coverage, when the UE moves across cells, it will move out of the LP-WUS coverage. Therefore, in this case, the UE's MR needs to wake up during movement. Non-Patent Document 4 proposes to consider whether the network needs to know accurate information about the MR power state of a UE (i.e., whether it is in ultra-deep sleep or not) and how the network can know this information.

[0013] Non-Patent Document 10 proposes two methods for activating and deactivating LP-WUS in an LP-WUS-capable UE. In one method, a gNB can instruct an LP-WUS-capable UE to enter ultra-deep sleep mode or a power state and activate monitoring of a common, grouped, or dedicated LP-WUS via an RRC Release message. Upon receiving this message, the UE's MR immediately enters ultra-deep sleep mode, and the UE's LR starts monitoring the corresponding LP-WUS. The gNB can then wake up the UE's MR by transmitting the corresponding LP-WUS. In the other method, the gNB can activate the common or grouped LP-WUS configuration via a system information block (SIB). If the SIB broadcasts the LP-WUS configuration, the MR of the LP-WUS-capable UE enters ultra-deep sleep mode while the UE is in RRC_IDLE or RRC_INACTIVE state. The gNB transmits the LP-WUS to wake up the LP-WUS-enabled UE.

[0014] Non-Patent Document 11 includes the following disclosure regarding mobility in full LP-WUS coverage: When moving between NR cells, a UE may remain in LP-WUS coverage. To achieve maximum power saving, the UE should rely on LR while suspending or skipping MR procedures as much as possible. In an ideal procedure, the UE would remain in LR mode and turn off MR as long as the LP-WUS signal strength exceeds the LR mobility threshold. This assumes that the UE can evaluate the LP-WUS signal strength of the serving cell and neighboring cells and can operate in LR mode even when changing cells. However, according to discussions in 3GPP RTSG RAN WG1 (RAN1), RAN1 currently focuses on offloading RRM measurements of serving or camping cells to the LR and leaving RRM measurements of neighboring cells to the MR. From the perspective of RAN2, the following two Access Stratum (AS) standards can be supported for LR mobility: In one criterion, assuming that the LP-WUS can be used for RRM of the serving cell and neighboring cells, the UE maintains LR mode as long as the LP-WUS signal strength is above a threshold (e.g., thresholdMob). If the LP-WUS can provide information to confirm that the UE can operate in LR mode after a cell change, the UE does not need to resume legacy procedures with the MR. In another criterion, assuming that the LP-WUS can be used for RRM of the serving cell but not for RRM of neighboring cells, if the LP-WUS signal strength falls below a threshold (e.g., thresholdMob), the UE starts RRM measurements with the MR, while the LR continues to receive the LP-WUS for paging, etc. The MR performs cell reselection based on the RRM measurements.

[0015] Non-Patent Document 12 describes RRM measurements for IDLE / INACTIVE mobility in LP-WUS full and partial coverage. When a UE in RRC_IDLE or RRC_INACTIVE state is in an ultra-deep sleep state, the UE can perform serving cell measurements based on LP-WUS signals (e.g., LP-SS or LP-RS). In the case of LP-WUS partial coverage, if the signal quality of the LP-WUS signal deteriorates (e.g., falls below a threshold), the UE can determine that the LP-WUS signal alone in the ultra-deep sleep state is not functioning properly, but cannot determine that the quality of the serving cell is poor. Therefore, the UE must leave the ultra-deep sleep state and perform legacy RRM measurements based on the SSB of the serving cell using MR. Then, in normal conditions, if the quality of the serving cell based on SSB measurements falls below a threshold, the UE starts SSB measurements of neighbor cells. In contrast, in the case of LP-WUS full coverage, if the LP-WUS signal quality falls below the threshold, the UE determines that the quality of the current serving cell is poor, leaves the ultra-deep sleep state, and performs legacy RRM measurements based on SSB of the serving cell and neighboring cells using MR.

[0016] Non-Patent Document 13 includes the following disclosure regarding mobility and RRM measurements using LP-WUR: There are three solutions for RRM measurements using LP-WUR operation: In the first solution, the LP-WUR measures legacy SSB (MR does not measure SSB); In the second solution, the LP-WUR measures a newly defined LP-WUR-specific reference signal (LP-SS); In the third solution, the MR measures legacy SSB (LP-WUR does not measure SSB). To avoid the increase in network overhead and power consumption associated with the second solution and the significant reduction in power saving gains due to the third solution, Non-Patent Document 13 proposes considering the adoption of Solution 1, i.e., RRM measurements by LP-WUR using SSB.

[0017] Non-Patent Document 15 describes a unified solution for cell reselection that takes into account both full and partial LP-WUS coverage scenarios. Non-Patent Document 15 is an update of Non-Patent Document 11 and includes the following disclosure: When the LP-WUS coverage is smaller than that of an NR cell, it is practical to rely on the MR to perform the legacy cell reselection procedure. However, the problem is when to start RRM measurements by the MR. This is because if the MR starts measuring neighbor cells after the UE leaves the LP-WUS coverage, it will be too late if the UE's movement speed is fast and the NR cell coverage is not much larger than the LP-WUS coverage, which will degrade mobility performance. Therefore, a separate threshold (e.g., thresholdMob) of LP-WUS signal strength for cell reselection can be introduced, which can be smaller than the threshold for fallback purposes. On the other hand, if the LP-WUS has coverage comparable to that of an NR cell, the question arises as to whether the UE needs to wake up the MR for cell reselection even when it is within the LP-WUS coverage. The ideal procedure is for the UE to maintain LR mode and turn off the MR as long as the LP-WUS signal strength exceeds a threshold. This assumes that the UE can evaluate the LP-WUS signal strength of the serving cell and neighboring cells and can operate in LR mode even when the cell is changed. From the RAN2 perspective, the following two AS criteria can be supported for LR mobility. In one criterion, assuming that the LP-WUS can be used for RRM of the serving cell and neighboring cells, the UE can maintain LR mode as long as the LP-WUS signal strength is above a threshold (e.g., thresholdMob), and there is no need to resume legacy procedures in the MR. In other words, if the LP-WUS can provide information to confirm that the UE can operate in LR mode after a cell change, the UE can perform cell reselection using the LR.In another criterion, assuming that the LP-WUS can be used for RRM of the serving cell but not for RRM of neighboring cells, when the signal strength of the LP-WUS falls below a threshold (e.g., thresholdMob), the UE starts RRM measurement with the MR, while the LR continues to receive the LP-WUS for paging, etc. The MR performs cell reselection based on the RRM measurement.

[0018] vivo, "Revised SID: Study on low-power Wake-up Signal and Receiver for NR", RP-222644, 3GPP TSG RAN meeting #97e, Electronic Meeting, September 12-16, 20223GPP TR 38.869 V0.2.0 (2023-05), "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on low-power wake up signal and receiver for NR (Release 18)", May 2023Qualcomm Incorporated, "Use of low-power receiver in idle mode procedures", R2-2304714, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023vivo, "Discussion on LP-WUS / WUR in RRC_IDLE / INACTIVE", R2-2304923, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023NEC, "Discussion on the considerations for LPWUS in RRC_IDLE INACTIVE", R2-2304988, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023Xiaomi Communications, "General considerations on the procedure for RRC_IDLE_INACTIVE", R2-2305000, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023Sony, "Considerations on LP-WUR in RRC Idle / Inactive mode",R2-2305528, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023vivo, "Updated scope clarification of Rel-18 SI on LP-WUS / WUR", R2-2305745, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023vivo, "Work Plan for Rel-18 SI on LP-WUS / WUR", R2-2305746, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023ZTE Corporation, Sanechips, "RAN2 impacts of LP-WUS in idle or inactive mode", R2-2305960, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023Huawei, HiSilicon, "MR / LR UE behaviours for paging and mobility in RRC_IDLE / INACTIVE state", R2-2306060, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023Apple, "RAN2 impact on LP-WUS in IDLE / INACTIVE state", R2-2306162, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023Ericsson, "LP-WUS / WUR for RRC Idle and Inactive", R2-2306238, 3GPP TSG-RAN WG2 Meeting #122, Incheon, Korea, May 22-26, 2023NEC, "Low-power Wake-up Signal and Receiver for NR", RWS-230144, 3GPP TSG RAN Rel-19 workshop,Taipei, June 15-16, 2023Huawei, HiSilicon, "MR / LR UE behaviors for paging and mobility in RRC_IDLE / INACTIVE state", R2-2307453, 3GPP TSG-RAN WG2 Meeting #123, Toulouse, France, August 21-25, 2023,

[0019] The inventors have investigated low power consumption mechanisms using LP-WUS and LP-WUR and found various challenges. Some of these challenges relate to the execution of specific procedures and operations by a UE that supports LP-WUS and LP-WUR. These specific procedures and operations include operations and procedures related to Minimization of Drive Tests (MDT), Small Data Transmission (SDT), and network slicing. For example, Non-Patent Documents 1-14 do not teach how MDT-, SDT-, and network slicing-related procedures and operations need to be adapted or modified when a UE uses LP-WUS and LP-WUR.

[0020] One of the objectives to be achieved by the embodiments disclosed in this specification is to provide an apparatus, a method, and a program that contribute to solving at least one of the multiple problems related to realizing a low power consumption mechanism using an LP-WUS and an LP-WUR, including the above-mentioned problem. It should be noted that this objective is only one of the multiple objectives to be achieved by the multiple embodiments disclosed in this specification. Other objectives or objectives and novel features will become apparent from the description of this specification or the accompanying drawings.

[0021] In a first aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is further configured to record MDT measurements including measurements of low power wake-up related signals using the low power wake-up receiver while at least the primary transceiver is in an ultra-deep sleep power state.

[0022] In a second aspect, a method performed by a wireless terminal includes recording MDT measurements including measurements of low power wake-up related signals using a low power wake-up receiver while at least a primary transceiver is in an ultra-deep sleep power state.

[0023] In a third aspect, a Radio Access Network (RAN) node is configured to send an MDT measurement configuration to a wireless terminal, the MDT measurement configuration including a configuration or indication of measurement logging of low power wake-up related signals.

[0024] In a fourth aspect, a method performed by a RAN node includes transmitting an MDT measurement configuration to a wireless terminal, the MDT measurement configuration including a configuration or indication of measurement logging of low power wake-up related signals.

[0025] In a fifth aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is further configured to store measurement results for IDLE / INACTIVE measurement reporting, including measurements of low power wake-up related signals using the low power wake-up receiver while at least the primary transceiver is in an ultra-deep sleep power state.

[0026] In a sixth aspect, a method performed by a wireless terminal includes storing measurement results for IDLE / INACTIVE measurement reporting, including measurement results of low power wake-up related signals using a low power wake-up receiver, while at least a primary transceiver is in an ultra-deep sleep power state.

[0027] In a seventh aspect, the RAN node is configured to transmit information to the wireless terminal indicating that the IDLE / INACTIVE measurements include measurements of low power wake-up related signals.

[0028] In an eighth aspect, a method performed by a RAN node includes transmitting information to a wireless terminal indicating that the IDLE / INACTIVE measurements include measurements of low power wake-up related signals.

[0029] In a ninth aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is further configured to perform an SDT procedure with the primary transceiver woken up from an ultra-deep sleep power state by skipping a comparison of a first measurement value obtained from an SSB measurement to a first threshold value.

[0030] In a tenth aspect, a method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver includes performing an SDT procedure with the primary transceiver woken up from an ultra-deep sleep power state by skipping a comparison of a first measurement value obtained from an SSB measurement with a first threshold.

[0031] In an eleventh aspect, the RAN node is configured to transmit configuration information to the wireless terminal indicating that a comparison of a first measurement value obtained from the SSB measurement with a first threshold is skipped in determining whether a condition for initiating an SDT procedure is met.

[0032] In a twelfth aspect, a method performed by a RAN node includes transmitting configuration information to a wireless terminal indicating that a comparison of a first measurement value obtained from an SSB measurement with a first threshold value is skipped in determining whether a condition for initiating an SDT procedure is met.

[0033] In a thirteenth aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is further configured to attempt to measure or detect low power wake-up related signals of a neighboring cell supporting an intended network slice if quality of a low power wake-up related signal of a serving cell or serving cell frequency measured using the low power wake-up receiver degrades while the primary transceiver is in an ultra-deep sleep power state.

[0034] In a fourteenth aspect, a method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver includes, if quality of a low power wake-up related signal of a serving cell or serving cell frequency measured using the low power wake-up receiver while the primary transceiver is in an ultra-deep sleep power state deteriorates, attempting to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice.

[0035] In a fifteenth aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is further configured to, if a frequency has a higher priority for cell reselection than a serving cell frequency, attempt, using the low power wake-up receiver, while the primary transceiver is in the ultra-deep sleep power state, to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice on the higher priority frequency.

[0036] In a sixteenth aspect, a method performed by a wireless terminal comprising a primary transceiver and a low power wake-up receiver includes, if there is a frequency with a higher priority for cell reselection than a serving cell frequency, attempting, using the low power wake-up receiver, while the primary transceiver is in an ultra-deep sleep power state, to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice on the higher priority frequency.

[0037] In a seventeenth aspect, a program includes a group of instructions (software code) that, when loaded into a computer, causes the computer to perform a method according to any of the above aspects.

[0038] According to the above-described aspects, it is possible to provide an apparatus, a method, and a program that contribute to solving at least one of a plurality of problems related to realizing a low power consumption mechanism using LP-WUS and LP-WUR.

[0039]

[0014] Figure 1 illustrates an example configuration of a wireless communication system, according to one or more embodiments.

[0015] Figure 2 illustrates an example of paging when a UE is in an ultra-deep sleep power state, according to one or more embodiments.

[0016] Figure 3 illustrates an example of cell reselection using LP-WUR, according to one or more embodiments.

[0017] Figure 4 illustrates a flowchart of an example UE operation, according to one or more embodiments.

[0018] Figure 5 illustrates a sequence diagram of an example UE and gNB operation, according to one or more embodiments.

[0019] Figure 6 illustrates an example format of a LoggedMeasurementConfiguration message, according to one or more embodiments.

[0020] Figure 7 illustrates an example format of a UEInformationResponse message, according to one or more embodiments.

[0021] Figure 8 illustrates an example UE operation, according to one or more embodiments.

[0022] Figure 9 illustrates an example format of a SIB1 message, according to one or more embodiments.

[0023] Figure 10 illustrates an example format of a MeasIdleConfig information element, according to one or more embodiments.

[0024] Figure 11 illustrates a flowchart of an example UE operation, according to one or more embodiments.

[0025] Figure 12 illustrates a sequence diagram of an example UE and gNB operation, according to one or more embodiments. FIG. 1 is a sequence diagram illustrating an example of the operation of a UE and a gNB, in accordance with one or more embodiments; FIG. 2 is a diagram illustrating an example of the format of a SIB1 message, in accordance with one or more embodiments; FIG. 3 is a diagram illustrating an example of the format of an RRCRelease message, in accordance with one or more embodiments; FIG. 4 is a flowchart illustrating an example of the operation of a UE, in accordance with one or more embodiments; FIG. 5 is a block diagram illustrating an example of the configuration of a UE, in accordance with one or more embodiments; FIG. 6 is a block diagram illustrating an example of the configuration of a gNB, in accordance with one or more embodiments;

[0040] Hereinafter, specific embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals, and for clarity of explanation, duplicate explanations will be omitted as necessary.

[0041] The multiple embodiments described below may be used independently, or two or more embodiments may be combined as appropriate. These multiple embodiments may have different novel features. Therefore, these multiple embodiments may contribute to achieving different objectives or solving different problems, and may contribute to achieving different effects.

[0042] Each drawing is merely an example for describing one or more embodiments. Each drawing may not relate to only one particular embodiment, but may also relate to one or more other embodiments. As will be understood by those skilled in the art, various features or steps described with reference to any one drawing can be combined with features or steps shown in one or more other drawings to create, for example, an embodiment not explicitly shown or described. Not all features or steps shown in any one drawing are necessary to describe an exemplary embodiment, and some features or steps may be omitted. The order of steps described in any drawing may be changed as appropriate.

[0043] The following embodiments are described primarily for the 3GPP fifth generation mobile communication system (5G system), but may also be applied to other wireless communication systems that support low power consumption mechanisms similar to those using 3GPP LP-WUS and LP-WUR.

[0044] As used herein, depending on the context, "if" may be interpreted to mean "when," "while," "at or around the time," "after," "upon," "in response to determining," "in accordance with a determination," or "in response to detecting." These expressions may be interpreted to have the same meaning, depending on the context.

[0045] First, the configurations and operations of several network elements common to several embodiments will be described. Fig. 1 shows an example configuration of a wireless communication system related to several embodiments. Each of the elements shown in Fig. 1 is a network function and provides an interface defined by, for example, 3GPP. Each element (network function) shown in Fig. 1 can be implemented, for example, as a network element on dedicated hardware, as a software instance running on dedicated hardware, or as a virtualized function instantiated on an application platform.

[0046] The wireless communication system shown in FIG. 1 includes a UE 1 and a gNB 2. The UE 1 may be referred to by other terms, such as a wireless terminal, a mobile terminal, a mobile station, or a wireless transmit receive unit (WTRU). The gNB 2 may be referred to as a radio access network (RAN) node, a base station, a radio station, or an access point. The gNB 2 may be a combination of a gNB-Central Unit (gNB-CU) and one or more gNB-Distributed Units (gNB-DUs) in a cloud RAN (C-RAN) deployment. The C-RAN is also referred to as a CU / DU split. Furthermore, the gNB-CU may include a Control Plane (CP) Unit (i.e., gNB-CU-CP) and one or more User Plane (UP) Units (i.e., gNB-CU-UPs).

[0047] The UE 1 and gNB 2 support a low-power mechanism using a low-power wake-up signal (LP-WUS) and a low-power wake-up receiver (LP-WUR). The UE 1 has a main radio (MR) 11 and a low-power wake-up receiver (LR) 12. The MR 11 may be referred to as a primary transceiver or simply a transceiver (relative to the LR). The MR 11 is a transceiver (i.e., a transmission and reception module) for receiving NR signals and channels. NR signals and channels include, for example, a Sounding Reference Signal (SRS), a Physical Random Access Channel (PRACH) preamble, a Physical Uplink Control Channel (PUCCH), a Physical Uplink Shared Channel (PUSCH), a Reference Signal (RS), a Synchronization Signal (SS), a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), and a Physical Downlink Shared Channel (PDSCH). The MR 11 can operate for signal transmission and reception including SRS transmission, PRACH preamble transmission, PUCCH transmission, PUSCH transmission, RS reception, SS reception, PBCH reception (or SSB reception combining SS and PBCH), PDCCH reception, and PDSCH reception.

[0048] The MR 11 can be set to be off or in a deep sleep power state or mode unless it is powered on. As already described, the deep sleep state of the MR 11 achieved by using the LP-WUS and the LR 12 may be referred to as an ultra-deep sleep state, ultra-deep sleep power state, or ultra-deep sleep mode to distinguish it from the deep sleep state in DRX in the RRC_IDLE and INACTIVE states of 3GPP Release 17 (achieved by the PEI mechanism). Alternatively, the deep sleep state of the MR 11 may be referred to as an ultra-low power consumption state, ultra-power saving state, or ultra-power saving mode. Alternatively, it may be referred to as an improved (or enhanced) low power consumption state, power saving state, or power saving mode. It may also be specified that when the UE 1 or the MR 11 is in the state or mode, the UE 1 remains in the RRC_IDLE or INACTIVE state, and the operation of the MR 11 (e.g., execution of transmission and reception processes) is suspended. Alternatively, when UE 1 or MR 11 is in this state or mode, UE 1 may be defined as being in a new RRC state (e.g., RRC_OFF, RRC_SUSPEND, RRC_SUSPENDED, or RRC_SLEEP). In the ultra-deep sleep power state, RRM measurements of the serving cell via MR 11 may be relaxed, which may include no measurements being made. In the ultra-deep sleep power state, RRM measurements of neighboring cells via MR 11 may be relaxed, which may include no measurements being made.

[0049] The LR 12 is provided separately from the MR 11 and has a function of monitoring the LP-WUS transmitted from the gNB 2. The gNB 2 has the capability of transmitting an LP-WUS that triggers the wake-up of the MR 11 of the UE 1 from the ultra-deep sleep power state. In response to reception by the LR 12 of the LP-WUS associated with the UE 1 or the UE group or subgroup to which the UE 1 belongs, the UE 1 wakes up the MR 11 from the ultra-deep sleep power state. Note that waking up the MR 11 may also be referred to as, for example, activating the MR 11, turning the MR 11 on, or resuming the operation of the MR 11 (e.g., execution of transmission and reception processes).

[0050] In response to receiving an instruction from gNB 2 via an RRC message (e.g., an RRC Release message) dedicated to UE 1, UE 1 may activate LR 12 and transition MR 11 to an ultra-deep sleep power state. gNB 2 may instruct UE 1 via the dedicated RRC message to transition to the ultra-deep sleep power state and activate monitoring of a common, grouped, or dedicated LP-WUS. Upon receiving this message, MR 11 of UE 1 transitions to the ultra-deep sleep power state, and LR 12 of UE 1 may start monitoring the corresponding LP-WUS. Then, gNB 2 can wake up MR 11 of UE 1 by transmitting the corresponding LP-WUS in the NR cell 21.

[0051] Alternatively, the gNB 2 may transmit information regarding the conditions for the UE 1 to transition to the ultra-deep sleep power state via a dedicated RRC message to the UE 1. If the gNB 2 determines that the conditions are met, the UE 1 may transition to the ultra-deep sleep power state. The condition may be, for example, that the reception quality (e.g., Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), or Received Signal Strength Indicator (RSSI)) of a predetermined signal (e.g., SSB, Channel State Information Reference Signal (CSI-RS)) of the serving cell exceeds (or is equal to or exceeds) a predetermined threshold. The gNB 2 may transmit the threshold to the UE 1 as information regarding the conditions.

[0052] Alternatively, the gNB 2 may activate a common or grouped LP-WUS configuration via common system information within the cell. The system information may be a Master Information Block (MIB) or any SIB (e.g., SIB type 1 (SIB1) or SIB type 2 (SIB2)). If the SIB broadcast within the cell 21 includes the LP-WUS configuration, the MR 11 of the UE 1 may enter the ultra-deep sleep power state while the UE 1 is in the RRC_IDLE or RRC_INACTIVE state. Furthermore, the LP-WUS configuration may include information regarding the conditions for the UE 1 to transition to the ultra-deep sleep power state. If it is determined that the conditions are met, the UE 1 may transition to the ultra-deep sleep power state. The gNB may transmit the LP-WUS in the cell 21 to wake up the UE 1.

[0053] FIG. 2 shows an example of paging when the MR 11 of the UE 1 is in the ultra-deep sleep power state. At this time, the UE 1 is in the RRC_IDLE state or the RRC_INACTIVE state. The LR 12 of the UE 1 periodically attempts to monitor the LP-WUS. In the LP-WUS monitoring opportunity 201, no LP-WUS is transmitted, or an LP-WUS specifying the UE 1 or the UE group to which the UE 1 belongs is not transmitted. Therefore, the UE 1 does not need to attempt to receive a paging in the paging opportunity 202 corresponding to the LP-WUS monitoring opportunity 201, and the MR 11 can remain in the ultra-deep sleep power state. Next, in response to receiving a paging message addressed to the UE 1 from a core network control node (e.g., Access and Mobility Management Function (AMF)), the gNB 2 transmits an LP-WUS specifying the UE 1 or the UE group to which the UE 1 belongs in the LP-WUS monitoring opportunity 203. In response to the LR 12 receiving the LP-WUS at the LP-WUS monitoring occasion 203, the UE 1 immediately wakes up the MR 11. Then, the MR 11 attempts paging reception at the paging occasion 204. Specifically, the MR 11 receives a PDCCH carrying paging Downlink Control Information (DCI) at the paging occasion 204 and receives a paging message on a PDSCH scheduled by the paging DCI. The MR 11 then performs appropriate operations in response to receiving the paging message. For example, if the paging message triggers RRC setup (or RRC resume), the MR 11 may initiate a random access procedure.

[0054] The LP-WUS transmitted by the gNB 2 in the cell 21 may have full coverage or partial coverage. LP-WUS full coverage means that the coverage of the LP-WUS is the same as or comparable to the coverage of an existing reference signal (e.g., Primary Synchronization Signal (PSS), SSS, or SSB) in the NR cell 21. In contrast, LP-WUS partial coverage means that the coverage of the LP-WUS is narrower than the coverage of an existing reference signal (e.g., PSS, SSS, or SSB), as illustrated in FIG. 1. LP-WUS partial coverage may also be referred to as different coverage or coverage mismatch. Alternatively, full coverage or partial coverage may be defined in terms of the LP-SS instead of the LP-WUS. In this case, LP-WUS full coverage or LP-SS full coverage means that the LP-SS coverage is the same as or comparable to the coverage of the existing reference signal in the NR cell 21. In contrast, LP-WUS partial coverage or LP-SS partial coverage means that the LP-SS coverage is narrower than the coverage of the existing reference signal. In the following, LP-WUS full coverage or partial coverage is used as an example, but these examples can be replaced with LP-SS full coverage or partial coverage.

[0055] In the case of full LP-WUS coverage, LP-WUS or LP-SS may be continuously available when UE 1 moves between cells. In this case, MR 11 of UE 1 may be able to stay in ultra-deep sleep while moving in RRC_IDLE or RRC_INACTIVE state. Figure 3 shows an example of inter-cell mobility (i.e., cell reselection) of UE 1 in RRC_IDLE or RRC_INACTIVE state in the case of full LP-WUS coverage. In the example of Figure 3, when UE 1 is in RRC_IDLE or RRC_INACTIVE state, UE 1 moves from serving cell 21A provided by gNB 2A to neighboring cell 21B provided by gNB 2B. Cell 21A and cell 21B may be provided by the same gNB 2. For this inter-cell mobility or cell reselection, the UE 1 may use measurements of the LP-WUS or LP-SS (or LP-RS) of the serving cell 21A and the neighboring cell 21B obtained using the LR 12. For example, the UE 1 may perform inter-cell mobility or cell reselection based on these LP-WUS or LP-SS (or LP-RS) measurements. The UE 1 may utilize the measurements of the LP-WUS or LP-SS (or LP-RS) obtained using the LR 12 in evaluating cell reselection criteria.

[0056] On the other hand, in the case of LP-WUS partial coverage, when UE 1 moves from cell 21 to another cell, UE 1 will leave the LP-WUS coverage of cell 21. Therefore, in this case, UE 1 may wake up MR 11 for mobility in RRC_IDLE or RRC_INACTIVE state, i.e., cell reselection. Alternatively, LR 12 of UE 1 may have a function to measure at least a portion of SSB (e.g., PSS, SSS), and UE 1 may keep MR 11 in ultra-deep sleep and use the SSB measurement values ​​obtained by LR 12 for cell reselection. The SSB measurement values ​​here may be measurements of at least a portion of SSB, or may be measurements obtained in the same manner as existing SSB measurements.

[0057] Regarding RRM measurement and cell reselection when the MR 11 is in the ultra-deep sleep power state, the UE 1 may operate as follows. In a first example, the UE 1 wakes up the MR 11 for cell reselection. Specifically, the UE 1 measures the reception quality (e.g., signal strength, received power) of the LP-WUS or LP-SS of the serving cell using the LR 12. The reception quality of the LP-WUS or LP-SS may be referred to as, for example, LP-RSSI, LP-RSRP, or LP-RSRQ. If the measurement value of the LP-WUS or LP-SS of the serving cell meets a predetermined condition (e.g., below a threshold), the UE 1 wakes up the MR 11 and measures the reception quality (e.g., signal strength, SS Reference Signal Received Power (SS-RSRP), SS Reference Signal Received Quality (SS-RSRQ)) of the SSB of the serving cell and neighboring cells using the MR 11. UE 1 uses the SSB measurements of the serving cell and neighboring cells to evaluate cell reselection criteria.

[0058] In a second example, UE 1 does not wake up MR 11 for cell reselection, but evaluates cell reselection criteria based on RRM measurement results obtained by LR 12. Specifically, UE 1 measures the reception quality (e.g., signal strength, received power) of the LP-WUS or LP-SS of the serving cell and neighboring cells using LR 12. UE 1 evaluates cell reselection criteria using the LP-WUS or LP-SS measurements of the serving cell and neighboring cells. At this time, UE 1 may convert or map the LP-WUS or LP-SS measurements from LR 12 to the SSB measurement scale. Such conversion or mapping may be either an offset predefined in the 3GPP specifications or a semi-static parameter that can be periodically calibrated based on the measurements. Additionally or alternatively, the conversion or mapping may be performed using an offset or parameter value transmitted from gNB 2 to UE 1 via an RRC message dedicated to UE 1 or system information (e.g., SIB) common to multiple UEs.

[0059] In the third example, similar to the second example, the MR 11 is not woken up for cell reselection, and cell reselection criteria are evaluated based on RRM measurement results obtained by the LR 12. However, in the third example, the LR 12 has the function of measuring at least a portion of the SSB (e.g., PSS, SSS). The UE 1 measures the reception quality (e.g., signal strength, received power) of the LP-WUS or LP-SS of the serving cell using the LR 12. If the measurement value of the LP-WUS or LP-SS of the serving cell satisfies a predetermined condition (e.g., below a threshold), the UE 1 measures the reception quality (e.g., signal strength, SS-RSRP, SS-RSRQ) of at least a portion of the SSB of the serving cell and neighboring cells using the LR 12. The UE 1 evaluates cell reselection criteria using the SSB measurement values ​​of the serving cell and neighboring cells obtained by the LR 12.

[0060] First Embodiment This embodiment relates to MDT. An example of the configuration of a wireless communication system according to this embodiment is the same as the example of the configuration described with reference to FIGS.

[0061] 4 shows an example of the operation of UE 1. In step 401, UE 1 transitions MR 11 to an ultra-deep sleep power state. In step 402, while at least MR 11 is in the ultra-deep sleep power state, UE 1 records MDT measurement results including measurement results of low power consumption wake-up related signals (e.g., LP-WUS, LP-SS, or both) using LR 12. UE 1 performs MDT measurement collection or logging in step 402 while UE 1 is in RRC_IDLE or INACTIVE state. Therefore, the MDT measurement collection or logging in step 402 relates to the Logged MDT.

[0062] The Logged MDT measurement results (measurement log) of step 402 may include LP-WUS / LP-SS measurements (e.g., signal strength, received power), timestamp information associated with the measurements, and location information associated with the measurements and / or other information usable to derive the location information. The location information may include a cell identifier of the serving cell (e.g., NR Cell Global Identity (ECGI) or NR Cell Identity (NCI)) or Global Navigation Satellite Systems (GNSS) position information. Other information usable to derive the location information may include sensor information (e.g., barometric pressure measurement information) or Radio Frequency (RF) fingerprints (e.g., neighbor cell measurement information).

[0063] 4, UE 1 can log MDT measurements, including measurements of low power wake-up related signals (e.g., LP-WUS, LP-SS, or both), which contributes to enhancing MDT measurement logging by UEs that support low power mechanisms using LP-WUS and LP-WUR.

[0064] The UE 1 may collect measurement results of low power wake-up related signals (e.g., LP-WUS, LP-SS, or both) for MDT using the LR 12 while the MR 11 is awake and operating, which allows the network to know the LP-WUS coverage status in detail.

[0065] If the LR 12 has the capability to measure at least a portion of the SSB (e.g., SSS), the UE 1 may collect or record SSB measurement results for the Logged MDT instead of or in addition to the LP-WUS / LP-SS measurement results. The UE 1 may collect or record the LP-WUS / LP-SS measurement results and the SSB measurement results for the Logged MDT at substantially the same location and time, or at similar locations and times. Recording the LP-WUS / LP-SS measurement results and the SSB measurement results together allows the network to know information about the discrepancy between the cell coverage (SSB coverage) and the LP-WUS coverage.

[0066] The UE 1 may collect or record LP-WUS / LP-SS measurement results for the Logged MDT at the same timing as the existing Logged MDT. Additionally or alternatively, the UE 1 may collect or record LP-WUS / LP-SS measurement results for the Logged MDT at one or both of the times when the MR 11 enters the ultra-deep sleep power state and the time when the MR 11 wakes up from the ultra-deep sleep power state. This makes it possible to record LP-WUS / LP-SS measurement results at specific timings related to the transition of the MR 11 to and from ultra-deep sleep.

[0067] When reporting MDT measurement results to the network, the UE 1 may indicate to the network that these MDT measurement results relate to LP-WUS / LP-SS measurements. Specifically, the UE 1 may include a field or information element in an RRC message (e.g., a UEInformationResponse message) carrying measurement results related to the Logged MDT, indicating that these measurement results are or include LP-WUS / LP-SS measurement results.

[0068] UE 1 may receive an MDT measurement configuration from the network, which includes a setting or indication of LP-WUS / LP-SS measurement logging. In response to receiving the MDT measurement configuration, UE 1 may perform Logged MDT Measurement Result Logging, which includes recording LP-WUS or LP-SS measurement results while in RRC_IDLE or INACTIVE state.

[0069] Figure 5 shows an example of signaling between UE 1 and gNB 2. In step 501, gNB 2 sends a Logged MDT Measurement Configuration to UE 1, which includes a configuration or indication of LP-WUS / LP-SS measurement logging. gNB 2 may send the Logged MDT Measurement Configuration to UE 1 via a dedicated RRC message. The RRC message may be a LoggedMeasurementConfiguration message.

[0070] According to the procedure described with reference to Figure 5, gNB 2 can inform UE 1 that LP-WUS / LP-SS measurements need to be collected for the Logged MDT, which contributes to clarifying the signaling details regarding Logged MDT measurement logging by UEs that support low power consumption mechanisms using LP-WUS and LP-WUR.

[0071] FIG. 6 shows an example of the format of a LoggedMeasurementConfiguration message sent from gNB 2 to UE 1. In the example of FIG. 6, the LoggedMeasurementConfiguration message may include an lp-WUS-SS-Measurements field or information element (IE) 601 for periodic reporting configuration (LoggedPeriodicalReportConfig). The field or IE 601 may be enumerated and indicate "true". The LoggedMeasurementConfiguration message of FIG. 6 indicates to UE 1 the need for LP-WUS / LP-SS measurement logging by including the lp-WUS-SS-Measurements field or IE 601 therein. The field or IE 601 may be given other names, for example, "lp-WUS-Measurements", "lp-SS-Measurements", "lowPower-WUS-Measurements", or "lowPower-SS-Measurements".

[0072] Figure 7 shows an example of the format of a UEInformationResponse message sent from UE1 to gNB2. UE1 sends the UEInformationResponse message in response to a UEInformationRequest message from the network (e.g., gNB2). The UEInformationResponse message can be used to report Logged MDT measurement results to the network. In the example of Figure 7, the UEInformationResponse message can include a measResultServingCell-LP-WUS-SS field or IE 701. The field or IE 701 indicates the logged measurement results of the LP-SS of the serving cell. The field or IE 701 may be given other names, for example, "measResultServingCell-LP-SS" or "measResultServingCell-LP-WUS".

[0073] Additionally, in the example of Figure 7, the UEInformationResponse message may include a measResultNeighCells-LP-WUS-SS field or IE 702. The field or IE 702 indicates the recorded measurement results of the LP-SS of neighboring cells. The field or IE 702 may be given other names, for example, "measResultNeighCells-LP-SS" or "measResultNeighCells-LP-WUS".

[0074] Instead of field or IE 701, the measResultServingCell field or IE 703 may be extended to indicate the recorded measurement results of the LP-SS of the serving cell. Similarly, instead of field or IE 702, the measResultNeighCells field or IE 704 may be extended to indicate the recorded measurement results of the LP-SS of neighboring cells.

[0075] Furthermore, the UEInformationResponse message may be extended to include information indicating that the LP-WUS or LP-SS measurement results are included (eg, logMeasAvailableLP-WUS or logMeasAvailableLP-SS).

[0076] Second Embodiment This embodiment relates to IDLE / INACTIVE measurement reporting. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS. 1 to 3. IDLE / INACTIVE measurement is a function introduced in 3GPP Release-16. IDLE / INACTIVE measurement is a function in which a UE 1 acquires and stores measurement results of a serving cell and neighboring cells while in the RRC_IDLE or RRC_INACTIVE state, and transmits the stored measurement results to the network when in the RRC_CONNECTED state. In IDLE / INACTIVE measurement, a UE measures neighboring cells that have (or can have) a predetermined relationship with a serving cell, and acquires and stores the measurement results. Cells that have a predetermined relationship are cells that can be used as Secondary Cells (SCells) for Carrier Aggregation (CA) in which the serving cell is the Primary Cell (PCell). Alternatively, the cell in a predetermined relationship is a cell that can be used as a Primary Secondary Cell Group (SCG) Cell (PSCell) for Dual Connectivity (DC) where the serving cell is a special cell (i.e., PCell) of a Master Cell Group (MCG).

[0077] FIG. 8 shows an example of the operation of UE 1. In step 801, UE 1 transitions MR 11 to an ultra-deep sleep power state. In step 802, while at least MR 11 is in the ultra-deep sleep power state, UE 1 stores measurement results for IDLE / INACTIVE measurement reporting, including measurement results of low power wake-up related signals using LR 12. The low power wake-up related signals may be LP-WUS, LP-SS, or both. The measurement results of LP-WUS or LP-SS may be, for example, measurements of signal strength or received power. UE 1 may store measurement results of LP-WUS or LP-SS of the serving cell and neighboring cells.

[0078] The same conditions as those for the existing IDLE / INACTIVE measurements (i.e., that the neighboring cell has a predetermined relationship with the serving cell) may be applied to the measurement of LP-WUS or LP-SS in IDLE / INACTIVE measurements. Additionally or alternatively, other conditions (or constraints) may be applied. For example, the condition for measuring LP-WUS or LP-SS of a neighboring cell may be that the neighboring cell supports LP-WUS or LP-SS. Alternatively, this condition may be added as a new condition for measuring LP-WUS or LP-SS of a neighboring cell.

[0079] According to the operation described with reference to Figure 8, UE 1 can perform IDLE / INACTIVE measurement reporting including measurement results of low power wake-up related signals (e.g., LP-WUS, LP-SS, or both), which contributes to enhancing IDLE / INACTIVE measurement reporting by UEs that support low power mechanisms using LP-WUS and LP-WUR.

[0080] The UE 1 may collect measurement results of low power wake-up related signals (e.g., LP-WUS, LP-SS, or both) using the LR 12 for IDLE / INACTIVE measurement reporting while the MR 11 is awake and operating, which allows the network to know in detail the LP-WUS coverage situation at the location of the UE 1.

[0081] If the LR 12 has the capability to measure at least a portion of the SSB (e.g., SSS), the UE 1 may collect or record SSB measurement results for IDLE / INACTIVE measurement reporting instead of or in addition to LP-WUS / LP-SS measurement results. The UE 1 may collect or record LP-WUS / LP-SS measurement results and SSB measurement results for IDLE / INACTIVE measurement reporting at substantially the same location and time, or at similar locations and times. Recording LP-WUS / LP-SS measurement results and SSB measurement results together allows the network to learn information about discrepancies between cell coverage (SSB coverage) and LP-WUS coverage.

[0082] When reporting measurement results to the network, the UE 1 may indicate to the network that these measurement results relate to LP-WUS / LP-SS measurements. Specifically, the UE 1 may include a field or information element in an RRC message (e.g., an RRCResumeComplete message or a UEInformationResponse message) carrying IDLE / INACTIVE measurement reporting, indicating that these measurement results are or include LP-WUS / LP-SS measurement results.

[0083] UE 1 may receive information from the network indicating that the IDLE / INACTIVE measurements include measurements of low power wake-up related signals. In response to receiving the information, UE 1 may store LP-WUS or LP-SS measurement results while in the RRC_IDLE or INACTIVE state. FIG. 9 shows an example of signaling between UE 1 and gNB 2. In step 901, gNB 2 transmits information to UE 1 indicating that the IDLE / INACTIVE measurements include measurements of low power wake-up related signals. gNB 2 may transmit the information to UE 1 via an RRC message dedicated to UE 1 or via system information common within the cell. The RRC message may be an RRCRelease message for releasing or suspending the RRC connection. gNB 2 may include the information in SIB type 1 (SIB1) or SIB type 11 (SIB11).

[0084] Figure 10 shows an example of the format of an SIB1 message broadcast by gNB 2 in cell 21. In the example of Figure 10, the SIB1 message may include an lp-WUS-SS-measurements field or IE 1001. The field or IE 1001 may be enumerated and indicate "true". By including the lp-WUS-SS-measurements field or IE 1001 therein, the SIB1 message of Figure 10 indicates to UE 1 that LP-WUS / LP-SS measurement results need to be stored for IDLE / INACTIVE measurement reporting.

[0085] FIG. 11 shows an example of the format of the MeasIdleConfig IE. The MeasIdleConfig IE contains the configuration of IDLE / INACTIVE measurements. The MeasIdleConfig IE can be included in an RRCRelease message or SIB11. In the example of FIG. 11, the MeasIdleConfig IE can include an lp-WUS-SS-Measurements field or IE 1101. The field or IE 1101 may be enumerated and indicate "true". By including the lp-WUS-SS-Measurements field or IE 1101 therein, the MeasIdleConfig IE of FIG. 11 indicates to UE 1 that LP-WUS / LP-SS measurements are required for IDLE / INACTIVE measurement reporting. The field or IE 1101 may be given other names, such as "lp-WUS-Measurements", "lp-SS-Measurements", "lowPower-WUS-Measurements", or "lowPower-SS-Measurements".

[0086] Instead of field or IE 1101, BeamMeasConfigIdle field or IE 1102 may be extended to indicate to UE 1 that LP-WUS / LP-SS measurements are required for IDLE / INACTIVE measurement reporting.

[0087] If a new RRC state (e.g., RRC_OFF, RRC_SUSPEND, RRC_SUSPENDED, or RRC_SLEEP) is defined for the ultra-deep sleep power state of the MR11, the IDLE / INACTIVE measurement may be defined or extended to further include measurements in the new RRC state. Alternatively, a function similar to the IDLE / INACTIVE measurement may be newly defined as a measurement in the new RRC state.

[0088] <Third Embodiment> This embodiment relates to SDT. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to Figs. 1 to 3. SDT is a procedure that enables UE 1 to transmit data or signaling while remaining in the RRC_INACTIVE state without transitioning to the RRC_CONNECTED state. SDT includes Random Access Based SDT (RA-SDT) and Configured Grant (CG) Based SDT (CG-SDT). RA-SDT is performed using a Random Access procedure. On the other hand, CG-SDT is performed using Configured Grant (CG) Type 1 without using the Random Access procedure.

[0089] FIG. 12 shows an example of the operation of UE 1. In step 1201, UE 1 transitions MR 11 to an ultra-deep sleep power state while UE 1 is in the RRC_INACTIVE state. In step 1202, UE 1 performs an SDT procedure with MR 11 that has been woken up from the ultra-deep sleep power state by skipping the comparison of the SSB measurement value with a first threshold (e.g., sdt-RSRP-Threshold). In other words, UE 1 skips the comparison of the SSB measurement value with the first threshold (e.g., sdt-RSRP-Threshold) when determining whether the conditions for initiating the SDT procedure are met. UE 1 wakes up MR 11 from the ultra-deep sleep power state in response to receiving uplink data transmitted on an SDT-enabled radio bearer from the Non-Access Stratum (NAS) layer. The UE 1 may receive configuration information from the network (e.g., gNB 2) indicating that the comparison of the SSB measurement value with the first threshold is to be skipped.

[0090] To determine whether the conditions for initiating an SDT procedure are met, the UE 1 may instead compare the LP-WUS or LP-SS measurement value with a second threshold (e.g., rsrp-ThresholdSSB-LP-WUS or rsrp-ThresholdSSB-LP-SS). The second threshold to which the LP-WUS / LP-SS measurement value is compared may be the same as the first threshold (e.g., sdt-RSRP-Threshold) for comparison with the SSB measurement value, or may be a different threshold. The UE 1 may receive the second threshold from the network (e.g., gNB 2).

[0091] After initiating the SDT procedure, UE 1 may perform step 1203. In step 1203, in selecting a random access resource in RA-SDT, UE 1 skips comparing the SSB measurement value with a threshold (e.g., rsrp-ThresholdSSB) for SSB selection. Instead, UE 1 may select any SSB in selecting a random access resource.

[0092] Alternatively, when selecting random access resources for RA-SDT, the UE 1 may select an SSB or a Physical Random Access Channel (PRACH) opportunity based on measurements of the LP-WUS or LP-SS using the LR 12. The third threshold (e.g., rsrp-ThresholdSSB-LP-WUS or rsrp-ThresholdSSB-LP-SS) to be compared with the measurements of the LP-WUS or LP-SS may be the same as the threshold (e.g., rsrp-ThresholdSSB) for comparison with the SSB measurements, or may be a different threshold. The UE 1 may receive the third threshold from the network (e.g., gNB 2). In addition, in this case, the UE 1 needs to know the association between the beam-swept LP-WUS / SS and the beam-swept SSB, or the association between the beam-swept LP-WUS / SS and the PRACH opportunity. UE 1 may receive this mapping from the network (e.g., gNB 2).

[0093] In step 1203, UE 1 may perform SSB selection for CG-SDT. In this case, UE 1 may skip comparing the SSB measurement value with a threshold (e.g., cg-SDT-RSRP-ThresholdSSB) for SSB selection. Instead, UE 1 may perform SSB selection for CG-SDT based on the LP-WUS or LP-SS measurement value using LR 12. The threshold (e.g., cg-SDT-RSRP-ThresholdLP-WUS or cg-SDT-RSRP-ThresholdLP-SS) compared with the LP-WUS or LP-SS measurement value may be the same as the threshold (e.g., cg-SDT-RSRP-ThresholdSSB) for comparison with the SSB measurement value, or may be a different threshold.

[0094] According to the operation described with reference to Figure 12, UE 1 can initiate SDT without using SSB measurements, which contributes to enhancing SDT for UEs that support low power consumption mechanisms using LP-WUS and LP-WUR.

[0095] Figure 13 shows an example of the operation of UE 1. It can be said that the operation shown in Figure 13 is a specific example of the operation shown in Figure 12. Step 1301 is similar to step 1201 in Figure 12. UE 1 transitions MR 11 to an ultra-deep sleep power state while UE 1 is in the RRC_INACTIVE state.

[0096] Steps 1302 and 1303 are specific examples of step 1202 in Figure 12. In step 1302, UE 1 compares the measurement value obtained from the LP-WUS or LP-SS measurement with a second threshold (e.g., rsrp-ThresholdSSB-LP-WUS or rsrp-ThresholdSSB-LP-SS) to determine whether the initiation condition for the SDT procedure is met. The second threshold compared with the LP-WUS / LP-SS measurement value may be the same as the first threshold (e.g., sdt-RSRP-Threshold) for comparison with the SSB measurement value, or may be a different threshold. In step 1303, if the initiation condition for the SDT procedure is met, UE 1 performs the SDT procedure with MR 11 that has woken up from the ultra-deep sleep power state.

[0097] Step 1304 is a specific example of step 1203 in Figure 12. In step 1304, UE1 compares the measurement values ​​obtained from the LP-WUS or P-SS measurements with a third threshold (e.g., rsrp-ThresholdSSB-LP-WUS or rsrp-ThresholdSSB-LP-SS) for SSB selection or PRACH opportunity selection in random access resource selection for RA-SDT. UE1 may select an LP-WUS / LP-SS beam corresponding to the LP-WUS / LP-SS measurement value that exceeds the third threshold and select an SSB beam or RACH opportunity associated with the LP-WUS / LP-SS beam. The third threshold may be the same as or different from the threshold for comparison with the SSB measurement value (e.g., rsrp-ThresholdSSB).

[0098] In step 1304, UE 1 may perform SSB selection for CG-SDT. In this case, UE 1 may perform SSB selection for CG-SDT based on the LP-WUS or LP-SS measurement value. The threshold value (e.g., cg-SDT-RSRP-ThresholdLP-WUS or cg-SDT-RSRP-ThresholdLP-SS) compared with the LP-WUS or LP-SS measurement value may be the same as the threshold value (e.g., cg-SDT-RSRP-ThresholdSSB) for comparison with the SSB measurement value, or may be a different threshold value.

[0099] According to the operation described with reference to Figure 13, UE 1 can initiate SDT without using SSB measurements, which contributes to enhancing SDT for UEs that support low power consumption mechanisms using LP-WUS and LP-WUR.

[0100] FIG. 14 shows an example of signaling between UE 1 and gNB 2. In step 1401, gNB 2 transmits SDT configuration information to UE 1, indicating that the comparison of the SSB measurement value with a first threshold (e.g., sdt-RSRP-Threshold) for determining whether the initiation condition for the SDT procedure is met is skipped. In response to receiving the SDT configuration information, UE 1 skips the comparison of the SSB measurement value with the first threshold in step 1202 of FIG. 12 or step 1302 of FIG. 13. gNB 2 may transmit the SDT configuration information to UE 1 via an RRC message dedicated to UE 1 or via system information common within the cell. The RRC message may be an RRCRelease message for suspending the RRC connection. gNB 2 may include the information in SIB1 broadcast within cell 21.

[0101] According to the procedure described with reference to Figure 14, gNB 2 can inform UE 1 that the comparison of the SSB measurement value with the first threshold for determining whether the initiation condition for the SDT procedure is met will be skipped, which contributes to clarifying the signaling details regarding SDT by UEs supporting low power consumption mechanisms using LP-WUS and LP-WUR.

[0102] FIG. 15 shows an example of signaling between UE 1 and gNB 2. In step 1501, gNB 2 transmits SDT configuration information to UE 1, indicating a second threshold (e.g., rsrp-ThresholdSSB-LP-WUS or rsrp-ThresholdSSB-LP-SS) to be compared with the LP-WUS or LP-SS measurement value to determine whether the conditions for initiating the SDT procedure are met. In response to receiving the SDT configuration information, UE 1 compares the LP-WUS / LP-SS measurement value with the second threshold to determine whether the conditions for initiating the SDT procedure are met in step 1202 of FIG. 12 or step 1302 of FIG. 13. gNB 2 may transmit the SDT configuration information to UE 1 via an RRC message dedicated to UE 1 or via system information common within the cell. The RRC message may be an RRCRelease message for suspending the RRC connection. gNB 2 may include the configuration information in SIB1 broadcast within cell 21.

[0103] According to the procedure described with reference to Figure 15, gNB 2 may signal or configure to UE 1 a second threshold that is compared with the LP-WUS / LP-SS measurement value to determine whether the conditions for initiating an SDT procedure are met, which contributes to clarifying the signaling details regarding SDT by UEs that support low power consumption mechanisms using LP-WUS and LP-WUR.

[0104] Figure 16 shows an example of signaling between UE1 and gNB2. In step 1601, gNB2 transmits configuration information to UE1 indicating association of multiple SSB beams or multiple random access opportunities (or PRACH opportunities) with multiple LP-WUS or LP-SS beams. In response to receiving the configuration information, UE1 performs SSB selection or PRACH opportunity selection based on LP-WUS or LP-SS measurements in step 1203 of Figure 12 or step 1304 of Figure 13. gNB2 may transmit the configuration information to UE1 via an RRC message dedicated to UE1 or via system information common within the cell. The RRC message may be an RRCRelease message for suspending the RRC connection. gNB2 may include the configuration information in SIB1 broadcast within cell 21.

[0105] According to the procedure described with reference to Figure 16, gNB 2 can inform or configure UE 1 of an association between multiple SSB beams or multiple random access opportunities (or PRACH opportunities) and multiple LP-WUS or LP-SS beams. UE 1 can use this association for SSB selection or PRACH opportunity selection. This contributes to clarifying the signaling details regarding SDT by UEs that support low power consumption mechanisms using LP-WUS and LP-WUR.

[0106] Figure 17 shows an example of the format of the SIB1 message broadcast by gNB 2 in cell 21. In the example of Figure 17, the SIB1 message may include an sdt-ConfigCommon field 1701. The sdt-ConfigCommon field 1701 includes an SDT-ConfigCommonSIB IE 1702. The SDT-ConfigCommonSIB IE 1702 includes an sdt-RSRP-ThresholdLP-WUS-SS field or IE 1703. The ThresholdLP-WUS-SS field or IE 1703 includes either an sdt-RSRP-Threshold IE or a skip-sdt-RSRP-Threshold IE. This sdt-RSRP-Threshold IE indicates the second threshold value that is compared with the LP-WUS or LP-SS measurement value to determine whether the conditions for initiating an SDT procedure are met. This sdt-RSRP-Threshold IE may be given other names, for example "sdt-RSRP-ThresholdLP-SS" or "sdt-RSSI-ThresholdLP-SS". The skip-sdt-RSRP-Threshold IE indicates that both the comparison of SSB measurements and the comparison of LP-WUS or LP-SS measurements are skipped in determining the initiation conditions for the SDT procedure.

[0107] Figure 18 shows an example of the format of an RRCRelease message sent from gNB 2 to UE 1 to suspend the RRC connection, i.e., to transition UE 1 to the RRC_INACTIVE state. In the example of Figure 18, the RRCRelease message may include a cg-SDT-RSRP-ThresholdLP-WUS-SS field or IE 1801 in the CG-SDT configuration (SDT-CG-Config). This field or IE 1801 indicates a threshold against which the LP-WUS or LP-SS measurement value is compared in SSB selection for the CG-SDT. UE 1 may select the LP-WUS / LP-SS beam corresponding to the LP-WUS / LP-SS measurement value that exceeds the threshold and select the SSB beam associated with the LP-WUS / LP-SS beam. The cg-SDT-RSRP-ThresholdLP-WUS-SS field or IE 1801 may be given other names, for example, "cg-SDT-RSRP-ThresholdLP-SS" or "cg-SDT-RSSI-ThresholdLP-SS".

[0108] Fourth Embodiment This embodiment relates to network slicing. A configuration example of a wireless communication system according to this embodiment is similar to the configuration example described with reference to FIGS.

[0109] 19 shows an example of the operation of UE 1. In step 1901, UE 1 measures the quality (e.g., received power) of the LP-WUS or LP-SS of the serving cell or serving cell frequency using LR 12 while MR 11 is in an ultra-deep sleep power state. In step 1902, if the quality of the LP-WUS / LP-SS of the serving cell or serving cell frequency has deteriorated, UE 1 attempts to measure or detect the LP-WUS / LP-SS of a neighboring cell that supports the intended network slice.

[0110] The neighboring cell supporting the intended network slice may be a cell supporting the Network Slice Access Stratum AS Group (NSAG) containing the intended Single Network Slice Selection Assistance Information (S-NSSAI). The NSAG information is provided to the UE 1 from the AMF of the core network at the NAS layer. The NSAG information includes a list of NSAGs, and for each NSAG, includes an NSAG ID, a list of S-NSSAI(s), and a priority value associated with the NSAG.

[0111] UE 1 may perform step 1903. In step 1903, UE 1 determines that the LP-WUS / LP-SS quality of a neighboring cell supporting the intended network slice is insufficient or that a neighboring cell supporting the intended network slice is not detected. In response to this determination, UE 1 wakes up MR 11 and initiates cell reselection using SSB measurements with MR 11. The evaluation process and cell reselection criteria in cell reselection using SSB measurements may be similar to existing ones, and in particular, may be similar to those in slice-based cell reselection that considers NSAG.

[0112] According to the operation described with reference to Figure 19, UE 1 can preferentially select a neighboring cell that supports the intended network slice in cell reselection using LP-WUS / LP-SS measurements, which contributes to clarifying the details of the cell reselection operation of UE 1 using LP-WUS and LP-WUR.

[0113] FIG. 20 shows another example of the operation of UE 1. In step 2001, if there is a frequency with a higher priority for cell reselection than the serving cell frequency, UE 1 attempts to measure or detect LP-WUS or LP-SS of a neighboring cell supporting the intended network slice using LR 12 on the higher-priority frequency while MR 11 is in the ultra-deep sleep power state. UE 1 may calculate the cell reselection priority for each frequency according to a ranking rule or criterion for slice-based cell reselection. The ranking rule or criterion for slice-based cell reselection may be the same as the existing one. The neighboring cell supporting the intended network slice may be a cell supporting an NSAG containing the intended S-NSSAI.

[0114] UE 1 may perform step 2002. Step 2002 is similar to step 1903 in FIG. 19 . In step 2002, UE 1 determines that the LP-WUS / LP-SS quality of a neighboring cell supporting the intended network slice is insufficient or that a neighboring cell supporting the intended network slice is not detected. In response to this determination, UE 1 wakes up MR 11 and initiates cell reselection using SSB measurements with MR 11. The evaluation process and cell reselection criteria in cell reselection using SSB measurements may be similar to existing ones, and in particular, may be similar to those in slice-based cell reselection that considers NSAG.

[0115] According to the operation described with reference to Figure 20, UE 1 can preferentially select a neighboring cell that supports the intended network slice in cell reselection using LP-WUS / LP-SS measurements, which contributes to clarifying the details of the cell reselection operation of UE 1 using LP-WUS and LP-WUR.

[0116] <Other Embodiment 1> Support for LP-WUS (and LP-SS) for Reduced Capability (RedCap) UEs may be independent of support for LP-WUS (and LP-SS) for normal UEs (i.e., non-RedCap UEs). In other words, a cell may support and transmit LP-WUS for normal UEs, but may not support LP-WUS for RedCap UEs. RedCap UEs have reduced functionality compared to non-RedCap UEs, intended to have low complexity. RedCap UEs are required to support a maximum UE channel bandwidth of 20 MHz in FR1 (i.e., sub-6 GHz band) and 100 MHz in FR2 (i.e., millimeter wave (mmWave) band). On the other hand, Carrier Aggregation (CA), Multi-Radio Dual Connectivity (MR-DC), Dual Active Protocol Stack (DAPS), and Integrated Access and Backhaul (IAB) related functions are not supported by RedCap UEs. Redcap UEs do not have to perform any LP-WUS related operations even if they receive information that LP-WUS is supported in a cell (or even if LP-WUS is being transmitted in a cell).

[0117] Alternatively, the support for LP-WUS in a cell may be common to both normal UEs and RedCap UEs, but the conditions and thresholds used in procedures such as LP-WUS / LP-SS RRM measurements and cell reselection using LP-WUS / LP-SS measurements may differ between normal UEs and RedCap UEs.

[0118] If the LR 12 of the UE 1 has the capability to receive at least some of the SSBs, the LR 12 may receive both Cell Defining (CD) SSBs and Non-Cell Defining (NCD) SSBs, or may receive only either CD-SSBs or NCD-SSBs.

[0119] Support for LP-WUS (and LP-SS) for Non-Terrestrial Network (NTN) UEs may be independent of support for LP-WUS (and LP-SS) for normal UEs (i.e., non-NTN UEs or TN UEs). In other words, a cell may support and transmit LP-WUS for normal UEs, but may not support LP-WUS for NTN UEs.

[0120] Alternatively, the support for LP-WUS in a cell may be common to both normal UEs and NTN UEs, but the conditions and thresholds used in procedures such as LP-WUS / LP-SS RRM measurements and cell reselection using LP-WUS / LP-SS measurements may differ between normal UEs and NTN UEs.

[0121] <Other Embodiment 2> In the above-described embodiment, the mobility state (e.g., high, medium, low) of UE 1 or whether UE 1 is stationary may be taken into consideration. For example, in the control based on various condition determinations in the above-described embodiment, UE 1 or gNB 2 may further consider a mobility condition related to UE 1's mobility state or whether UE 1 is stationary, and perform the control if the mobility condition is also satisfied. Additionally or alternatively, in the control based on various condition determinations in the above-described embodiment, the mobility condition may be specified as one of the conditions. Note that the gNB 2 may transmit the mobility condition to UE 1 using a UE-dedicated RRC message (e.g., RRC Reconfiguration, RRC Release) or system information (e.g., SIB).

[0122] <Other Embodiment 3> In the above-described embodiment, the UE 1 may suspend all transmission and reception processes using the MR 11 while the MR 11 is in the ultra-deep sleep power state (or while the UE 1 is in a new RRC state equivalent thereto). Alternatively, the UE 1 may perform only limited reception processes using the MR 11 during this period. For example, the UE 1 may use the MR 11 to perform only RRM measurements (e.g., SSB measurements) of the serving cell or only RRM measurements of the frequency of the serving cell at a (very) long period using the MR 11. The (very) long period RRM measurements may be performed, for example, in a conventional DRX cycle (e.g., paging cycle) in the RRC_IDLE and RRC_INACTIVE states, or in a more relaxed DRX cycle. The UE 1 may use the RRM measurements in an appropriate combination with the operations described in the above-described embodiments. For example, the (ultra) long periodic RRM measurement using MR 11 may be used to determine whether UE 1 needs to perform RRM measurement of a neighboring cell on the same frequency as the serving cell or a cell on a different frequency, or whether MR 11 needs to be (completely) woken up. The (ultra) long periodic RRM measurement using MR 11 may be referred to as (ultra) relaxed RRM measurement. In this case, waking up MR 11 may be considered to be, for example, stopping the (ultra) relaxed RRM measurement and resuming normal operation of MR 11 (e.g., execution of transmission and reception processes).

[0123] Next, exemplary configurations of the UE 1 and the gNB 2 related to the above-described embodiments will be described below. FIG. 21 is a block diagram showing an exemplary configuration of the UE 1. The main Radio Frequency (RF) transceiver 2101 corresponds to the RF unit included in the above-described MR 11. The main RF transceiver 2101 performs analog RF signal processing for communication with RAN nodes including the gNB 2. The main RF transceiver 2101 may include multiple transceivers. The analog RF signal processing performed by the main RF transceiver 2101 includes frequency up-conversion, frequency down-conversion, and amplification. The main RF transceiver 2101 is coupled to an antenna array 2102 and a baseband processor 2103. The main RF transceiver 2101 receives modulation symbol data (or orthogonal frequency-division multiplexing (OFDM) symbol data) from the baseband processor 2103, generates a transmit RF signal, and provides the transmit RF signal to the antenna array 2102. The main RF transceiver 2101 also generates a baseband receive signal based on the receive RF signal received by the antenna array 2102 and supplies the baseband receive signal to the baseband processor 2103. The main RF transceiver 2101 may include an analog beamformer circuit for beamforming. The analog beamformer circuit includes, for example, multiple phase shifters and multiple power amplifiers.

[0124] The baseband processor 2103 corresponds to the digital baseband unit of the MR 11. The baseband processor 2103 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. Digital baseband signal processing includes (a) data compression / decompression, (b) data segmentation / concatenation, (c) transmission format (transmission frame) generation / decomposition, (d) transmission path coding / decoding, (e) modulation (symbol mapping) / demodulation, and (f) generation of OFDM symbol data (baseband OFDM signal) using Inverse Fast Fourier Transform (IFFT). Meanwhile, control plane processing includes communication management of Layer 1 (e.g., transmit power control), Layer 2 (e.g., radio resource management and hybrid automatic repeat request (HARQ) processing), and Layer 3 (e.g., signaling related to attachment, mobility, and call management).

[0125] For example, the digital baseband signal processing by the baseband processor 2103 may include signal processing of a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. Also, the control plane processing by the baseband processor 2103 may include processing of a Non-Access Stratum (NAS) protocol, an RRC protocol, MAC Control Elements (CEs), and DCIs.

[0126] The baseband processor 2103 may perform Multiple Input Multiple Output (MIMO) encoding and precoding for beamforming.

[0127] The baseband processor 2103 may include a modem processor (e.g., a Digital Signal Processor (DSP)) that performs digital baseband signal processing and a protocol stack processor (e.g., a Central Processing Unit (CPU) or a Micro Processing Unit (MPU)) that performs control plane processing. In this case, the protocol stack processor that performs control plane processing may be shared with the application processor 2104, which will be described later.

[0128] The application processor 2104 is also referred to as a CPU, MPU, microprocessor, or processor core. The application processor 2104 may include multiple processors (multiple processor cores). The application processor 2104 executes a system software program (operating system (OS)) and various application programs (e.g., a call application, a web browser, a mailer, a camera operation application, and a music playback application) read from the memory 2106 or a memory not shown, thereby realizing various functions of the UE 1.

[0129] In some implementations, the baseband processor 2103 and the application processor 2104 may be integrated on a single chip, as shown by the dashed line (2105) in Figure 21. In other words, the baseband processor 2103 and the application processor 2104 may be implemented as a single System on Chip (SoC) device 2105. An SoC device is sometimes called a system Large Scale Integration (LSI) or chipset.

[0130] The memory 2106 is volatile memory, nonvolatile memory, or a combination thereof. The memory 2106 may include multiple physically independent memory devices. Volatile memory is, for example, static random access memory (SRAM), dynamic RAM (DRAM), or a combination thereof. Nonvolatile memory is mask read only memory (MROM), electrically erasable programmable ROM (EEPROM), flash memory, a hard disk drive, or any combination thereof. For example, the memory 2106 may include an external memory device accessible from the baseband processor 2103, the application processor 2104, and the SoC 2105. The memory 2106 may also include an internal memory device integrated within the baseband processor 2103, the application processor 2104, or the SoC 2105. Furthermore, the memory 2106 may include memory within a Universal Integrated Circuit Card (UICC).

[0131] The memory 2106 may store one or more software modules (computer programs) 2107 including instructions and data for performing the processes described in the above embodiments by the UE 1. In some implementations, the baseband processor 2103 or the application processor 2104 may be configured to read and execute the software modules 2107 from the memory 2106 to perform the processes by the UE 1 described in the above embodiments using the drawings.

[0132] The LP-WUS receiver 1710 corresponds to the above-mentioned LR 12. The LP-WUS receiver 1710 has a function of monitoring low power wake-up related signals, such as LP-WUS and LP-SS, transmitted from the gNB 2. The LP-WUS receiver 1710 includes an RF unit and a digital baseband unit required for receiving the low power wake-up related signals. The LP-WUS receiver 1710 is coupled to the baseband processor 2103, the application processor 2104, or both.

[0133] The control plane processing and operations performed by UE 1 described in the above embodiment may be realized by elements other than the main RF transceiver 2101, the antenna array 2102, and the LP-WUS receiver 1710, namely, at least one of the baseband processor 2103 and the application processor 2104, and the memory 2106 storing the software module 2107.

[0134] FIG. 22 is a block diagram showing an example configuration of a gNB 2 according to the above embodiment. Referring to FIG. 20, the gNB 2 includes a main RF transceiver 2201, a network interface 2203, a processor 2204, and a memory 2205. The main RF transceiver 2201 performs analog RF signal processing for communicating with UEs, including UE 1. The RF transceiver 2201 may include multiple transceivers. The RF transceiver 2201 is coupled to an antenna array 2202 and a processor 2204. The RF transceiver 2201 receives modulation symbol data from the processor 2204, generates a transmit RF signal, and provides the transmit RF signal to the antenna array 2202. The RF transceiver 2201 also generates a baseband receive signal based on the receive RF signal received by the antenna array 2202 and provides the baseband receive signal to the processor 2204. The RF transceiver 2201 may include an analog beamformer circuit for beamforming. The analog beamformer circuitry includes, for example, multiple phase shifters and multiple power amplifiers.

[0135] The network interface 2203 is used to communicate with network nodes (e.g., other gNBs and RAN nodes, and control and forwarding nodes of the core network), and may include, for example, a network interface card (NIC) compliant with the IEEE 802.3 series.

[0136] The processor 2204 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. The processor 2204 may include multiple processors. For example, the processor 2204 may include a modem processor (e.g., DSP) that performs digital baseband signal processing and a protocol stack processor (e.g., CPU or MPU) that performs control plane processing.

[0137] For example, digital baseband signal processing by the processor 2204 may include signal processing for SDAP, PDCP, Radio RLC, MAC, and PHY layers, and control plane processing by the processor 2204 may include processing of NAS messages, RRC messages, MAC CEs, and DCIs.

[0138] The processor 2204 may include a digital beamformer module for beamforming, which may include a MIMO encoder and precoder.

[0139] The memory 2205 is configured by a combination of volatile memory and non-volatile memory. The volatile memory is, for example, SRAM or DRAM, or a combination thereof. The non-volatile memory is, for example, MROM, EEPROM, flash memory, or a hard disk drive, or any combination thereof. The memory 2205 may include storage located remotely from the processor 2204. In this case, the processor 2204 may access the memory 2205 via the network interface 2203 or an I / O interface (not shown).

[0140] The memory 2205 may store one or more software modules (computer programs) 2206 including instructions and data for performing the processing by the gNB 2 described in the above embodiments. In some implementations, the processor 2204 may be configured to read and execute the software modules 2206 from the memory 2205 to perform the processing by the gNB 2 described in the above embodiments.

[0141] The LP-WUS transmitter 1810 is capable of transmitting low power wake-up related signals, such as LP-WUS and LP-SS, and is coupled to the processor 2204.

[0142] If gNB 2 is a CU (e.g., eNB-CU or gNB-CU) or CU-CP, gNB 2 may not include RF transceiver 2201 (and antenna array 2202) and LP-WUS transmitter 1810.

[0143] As described with reference to Figures 21 and 22, each of the processors included in the UE 1 and the gNB 2 according to the above-described embodiments can execute one or more programs including instructions for causing a computer to perform the algorithms described with reference to the drawings. The programs include instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The programs may be stored on a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, computer-readable media or tangible storage media include random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disk (DVD), Blu-ray (registered trademark) disc or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The programs may also be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, transitory computer-readable media or communication media include electrical, optical, acoustic, or other forms of propagated signals.

[0144] The above-described embodiments are merely examples of application of the technical ideas obtained by the inventors of the present invention. In other words, the technical ideas are not limited to the above-described embodiments, and various modifications are possible.

[0145] For example, some or all of the above embodiments may also be described as, but are not limited to, the following appendices. Some or all of the elements (e.g., configurations and functions) described in appendices directed to devices (e.g., wireless terminals or RAN nodes) may naturally also be described as appendices directed to methods and programs. For example, some or all of the elements described in appendices 2-7, which are dependent on appendices 1-7, may also be described as appendices dependent on appendices 14 and 16, respectively, due to the same dependency relationship as appendices 2-7. Similarly, some or all of the elements described in appendices 9-13, which are dependent on appendices 8, may also be described as appendices dependent on appendices 15 and 17, respectively, due to the same dependency relationship as appendices 9-13. Some or all of the elements described in any appendice may be applicable to various hardware, software, recording means for recording software, systems, and methods.

[0146] (Supplementary Note 1) A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for recording Minimization of Drive Tests (MDT) measurement results including measurement results of low power wakeup-related signals using the low power wakeup receiver while at least the primary transceiver is in an ultra deep sleep power state. (Supplementary Note 2) The wireless terminal of Supplementary Note 1, wherein the recording means is adapted to record the measurement results of the low power wakeup-related signals at one or both of when the primary transceiver enters the ultra deep sleep power state and when the primary transceiver wakes up from the ultra deep sleep power state. (Supplementary Note 3) The wireless terminal of Supplementary Note 1 or 2, further comprising means for indicating, in reporting the MDT measurement results to a network, that the MDT measurement results relate to measurements of the low power wakeup-related signals. (Supplementary Note 4) The wireless terminal of any one of Supplements 1 to 3, further comprising: means for receiving an MDT measurement configuration from a network, the MDT measurement configuration including a setting or an indication of measurement logging of the low power wake-up related signal, wherein the recording means is adapted to record measurement results of the low power wake-up related signal in response to receiving the MDT measurement configuration. (Supplementary Note 5) The wireless terminal of any one of Supplements 1 to 4, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wake-up related signal, and the low power wake-up receiver is used to receive the low power wake-up related signal at least while the primary transceiver is in the ultra-deep sleep power state.(Supplementary Note 6) The radio terminal of any one of Supplements 1 to 5, wherein the recording means is adapted to record measurement results of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) for an MDT in addition to measurement results of the low power wake-up related signals. (Supplementary Note 7) The radio terminal of any one of Supplements 1 to 6, wherein the MDT is a Logged MDT. (Supplementary Note 8) A Radio Access Network (RAN) node comprising: means for transmitting to a radio terminal a Minimization of Drive Tests (MDT) measurement configuration including a configuration or indication of measurement logging of low power wake-up related signals. (Supplementary Note 9) The RAN node of Supplementary Note 8, wherein the MDT measurement configuration causes the radio terminal to record MDT measurement results including measurement results of the low power wake-up related signals using a low power wake-up receiver of the radio terminal while at least a primary transceiver of the radio terminal is in an ultra-deep sleep power state. (Supplementary Note 10) The RAN node of Supplementary Note 9, wherein the MDT measurement configuration causes the radio terminal to record measurements of the low power wake-up related signals when the primary transceiver enters the ultra-deep sleep power state and / or when the primary transceiver wakes up from the ultra-deep sleep power state.(Supplementary Note 11) The RAN node according to Supplementary Note 9 or 10, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wakeup related signals, and the low power wakeup receiver is used to receive the low power wakeup related signals at least while the primary transceiver is in the ultra-deep sleep power state. (Supplementary Note 12) The RAN node according to any one of Supplementary Notes 8 to 11, wherein the MDT measurement results include measurement results of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) in addition to measurement results of the low power wakeup related signals. (Supplementary Note 13) The RAN node according to any one of Supplements 8 to 12, wherein the MDT is a Logged MDT. (Supplementary Note 14) A method performed by a radio terminal, comprising: recording Minimization of Drive Tests (MDT) measurement results including measurement results of low power wake-up related signals using a low power wake-up receiver while at least a primary transceiver is in an ultra-deep sleep power state. (Supplementary Note 15) A method performed by a Radio Access Network (RAN) node, comprising sending to the radio terminal a Minimization of Drive Tests (MDT) measurement configuration including a configuration for measurement logging of low power wake-up related signals.(Supplementary Note 16) A program for causing a computer to perform a method for a wireless terminal, the method comprising recording Minimization of Drive Tests (MDT) measurement results including measurement results of low power wake-up related signals using a low power wake-up receiver while at least a primary transceiver is in an ultra-deep sleep power state. (Supplementary Note 17) A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising transmitting to a wireless terminal a Minimization of Drive Tests (MDT) measurement configuration including configuration for measurement logging of low power wake-up related signals. (Supplementary Note 18) A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for storing measurement results for IDLE / INACTIVE measurement reporting including measurement results of low power wake-up related signals using the low power wake-up receiver while at least the primary transceiver is in an ultra-deep sleep power state. (Supplementary Note 19) The wireless terminal according to Supplementary Note 18, further comprising: means for indicating to a network in the IDLE / INACTIVE measurement reporting that the measurement results for the IDLE / INACTIVE measurement reporting relate to measurements of the low power consumption wake-up related signals. (Supplementary Note 20) The wireless terminal according to Supplementary Note 18 or 19, further comprising: means for receiving information from a network indicating that IDLE / INACTIVE measurements include measurements of the low power consumption wake-up related signals, wherein the storing means is adapted to store the measurement results of the low power consumption wake-up related signals in response to receiving the information. (Supplementary Note 21) The wireless terminal according to Supplementary Note 20, wherein the receiving means is configured to receive the information via a Radio Resource Control (RRC) message dedicated to the wireless terminal or via system information common within a cell.(Supplementary Note 22) The wireless terminal according to Supplementary Note 20, wherein the receiving means is configured to receive the information via an RRCRelease message. (Supplementary Note 23) The wireless terminal according to Supplementary Note 20, wherein the receiving means is configured to receive the information via a System Information Block type 1 (SIB1) or an SIB type 11 (SIB11). (Supplementary Note 24) The wireless terminal according to any one of Supplements 18 to 23, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wakeup related signals, and the low power wakeup receiver is used to receive the low power wakeup related signals at least while the primary transceiver is in the ultra-deep sleep power state. (Supplementary Note 25) A Radio Access Network (RAN) node comprising: means for transmitting to a radio terminal information indicating that IDLE / INACTIVE measurements include measurements of low power wake-up related signals. (Supplementary Note 26) The RAN node of Supplementary Note 25, wherein the information causes the radio terminal to store measurement results for IDLE / INACTIVE measurement reporting, the measurement results including measurements of the low power wake-up related signals using a low power wake-up receiver of the radio terminal while at least a primary transceiver of the radio terminal is in an ultra-deep sleep power state. (Supplementary Note 27) The RAN node of Supplementary Note 25 or 26, wherein the transmitting means is configured to transmit the information to the radio terminal via a dedicated Radio Resource Control (RRC) message or via system information common within a cell.(Supplementary Note 28) The RAN node of Supplementary Note 25 or 26, wherein the transmitting means is configured to transmit the information via an RRCRelease message. (Supplementary Note 29) The RAN node of Supplementary Note 25 or 26, wherein the transmitting means is configured to transmit the information via a System Information Block type 1 (SIB1) or SIB type 11 (SIB11). (Supplementary Note 30) The RAN node of Supplementary Note 26, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wakeup related signals, and the low power wakeup receiver is used to receive the low power wakeup related signals at least while the primary transceiver is in the ultra-deep sleep power state. (Supplementary Note 31) A method performed by a wireless terminal, comprising storing measurement results for IDLE / INACTIVE measurement reporting, including measurement results of low power wake-up related signals using a low power wake-up receiver, while at least a primary transceiver is in an ultra deep sleep power state. (Supplementary Note 32) A method performed by a Radio Access Network (RAN) node, comprising transmitting information to the wireless terminal indicating that low power wake-up related signals are subject to IDLE / INACTIVE measurement. (Supplementary Note 33) A program for causing a computer to perform a method for a wireless terminal, the method comprising storing measurement results for IDLE / INACTIVE measurement reporting, including measurement results of low power wake-up related signals using a low power wake-up receiver, while at least a primary transceiver is in an ultra deep sleep power state.(Supplementary Note 34) A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising transmitting, to a wireless terminal, information indicating that a low power wake-up related signal is the subject of IDLE / INACTIVE measurement. (Supplementary Note 35) A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for performing a Small Data Transmission (SDT) procedure using the primary transceiver that has woken up from an ultra-deep sleep power state by skipping a comparison of a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement with a first threshold. (Supplementary Note 36) The wireless terminal of Supplementary Note 35, wherein the performing means is adapted to compare a second measurement value obtained from a measurement of a low power wake-up related signal using the low power wake-up receiver with a second threshold to determine whether a condition for initiating the SDT procedure is met. (Supplementary Note 37) The radio terminal according to Supplementary Note 36, further comprising: means for receiving first configuration information indicating the second threshold from a network. (Supplementary Note 38) The radio terminal according to any one of Supplements 35 to 37, further comprising: means for skipping, in selecting a random access resource, comparing the first measurement value for SSB selection with a threshold. (Supplementary Note 39) The radio terminal according to Supplementary Note 38, further comprising: means for selecting an SSB or selecting a Physical Random Access Channel (PRACH) opportunity based on a second measurement value obtained from measuring a low power consumption wake-up related signal using the low power consumption wake-up receiver, in selecting the random access resource. (Supplementary Note 40) The radio terminal according to Supplementary Note 39, further comprising: means for receiving second configuration information indicating associations between multiple beams of the SSB or multiple random access opportunities and multiple beams of the low power consumption wake-up related signal from a network.(Supplementary Note 41) The radio terminal according to Supplementary Note 38, further comprising means for selecting an arbitrary SSB in the selection of the random access resource. (Supplementary Note 42) The radio terminal according to any one of Supplements 35 to 41, further comprising means for receiving third configuration information indicating that the comparison of the first measurement value with the first threshold is to be skipped, wherein the initiating means is adapted to skip the comparison of the first measurement value with the first threshold in response to receiving the third configuration information. (Supplementary Note 43) The radio terminal according to any one of Supplements 35 to 42, further comprising means for waking up the primary transceiver in response to receiving, from a Non-Access Stratum (NAS) layer, uplink data to be transmitted on a radio bearer for which SDT is enabled. (Supplementary Note 44) The radio terminal according to any one of Supplements 35 to 43, wherein the SDT procedure is a procedure in which the radio terminal can perform data or signaling transmission while remaining in Radio Resource Control (RRC)_INACTIVE state without transitioning to RRC_CONNECTED state. (Supplementary Note 45) The wireless terminal according to any one of Supplementary Notes 35 to 44, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving low power wake-up related signals, and the low power wake-up receiver is used to receive the low power wake-up related signals at least while the primary transceiver is in the ultra-deep sleep power state.(Supplementary Note 46) A Radio Access Network (RAN) node comprising: means for transmitting, to a radio terminal, configuration information indicating that a comparison between a first measurement value obtained from Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold value is skipped in determining whether a condition for initiating a Small Data Transmission (SDT) procedure is met. (Supplementary Note 47) The RAN node of Supplementary Note 46, wherein the configuration information causes the radio terminal to perform the SDT procedure using a primary transceiver that has woken up from an ultra-deep sleep power state by skipping the comparison between the first measurement value and the first threshold value. (Supplementary Note 48) The RAN node of Supplementary Note 46 or 47, further comprising means for transmitting, to the radio terminal, configuration information indicating a second threshold value, wherein the second threshold value causes the radio terminal to compare a second measurement value obtained from measurement of a low power wake-up related signal using a low power wake-up receiver with a second threshold value to determine whether a condition for initiating the SDT procedure is met. (Supplementary Note 49) The RAN node according to any one of Supplementary Notes 46 to 48, further comprising means for transmitting configuration information indicating a third threshold to the radio terminal, wherein the third threshold is used in selecting random access resources for SSB selection or Physical Random Access Channel (PRACH) opportunity selection based on second measurements obtained from measurements of low power wake-up related signals using a low power wake-up receiver of the radio terminal.(Supplementary Note 50) A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising: performing a Small Data Transmission (SDT) procedure using the primary transceiver that has woken up from an ultra-deep sleep power state by skipping a comparison between a first measurement value obtained from Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold. (Supplementary Note 51) A method performed by a Radio Access Network (RAN) node, comprising transmitting configuration information to the wireless terminal indicating that a comparison between a first measurement value obtained from Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold is to be skipped in determining whether a condition for initiating a Small Data Transmission (SDT) procedure is met. (Supplementary Note 52) A program for causing a computer to perform a method for a wireless terminal having a primary transceiver and a low-power wake-up receiver, the method comprising: performing a Small Data Transmission (SDT) procedure using the primary transceiver that has woken up from an ultra-deep sleep power state by skipping a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold value.53. A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising: transmitting, to a wireless terminal, configuration information indicating that a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold is skipped in determining whether a condition for initiating a Small Data Transmission (SDT) procedure is met. 54. A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for attempting to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice if quality of a low power wake-up related signal of a serving cell or a serving cell frequency measured using the low power wake-up receiver while the primary transceiver is in an ultra deep sleep power state deteriorates. (Supplementary Note 55) The wireless terminal according to Supplementary Note 54, further comprising means for waking up the primary transceiver and initiating cell reselection utilizing Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurements using the primary transceiver when the quality of the low power wake-up related signal of a neighboring cell supporting the intended network slice is insufficient or a neighboring cell supporting the intended network slice is not detected.(Supplementary Note 56) The wireless terminal according to Supplementary Note 54 or 55, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wakeup related signals, and the low power wakeup receiver is used to receive the low power wakeup related signals at least while the primary transceiver is in the ultra-deep sleep power state. (Supplementary Note 57) The wireless terminal according to any one of Supplementary Notes 54 to 56, wherein the neighboring cell supporting the intended network slice is a cell supporting a Network Slice Access Stratum AS Group (NSAG) including the intended Single Network Slice Selection Assistance Information (S-NSSAI). (Supplementary Note 58) A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising: attempting to measure or detect low power wake-up related signals of a neighboring cell supporting an intended network slice if quality of a low power wake-up related signal of a serving cell or serving cell frequency measured using the low power wake-up receiver deteriorates while the primary transceiver is in an ultra-deep sleep power state.(Supplementary Note 59) A program for causing a computer to perform a method for a wireless terminal comprising a primary transceiver and a low power wakeup receiver, the method comprising attempting to measure or detect a low power wakeup-related signal of a neighboring cell supporting an intended network slice, if quality of a low power wakeup-related signal of a serving cell or a serving cell frequency measured using the low power wakeup receiver while the primary transceiver is in an ultra deep sleep power state has deteriorated. (Supplementary Note 60) A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for attempting to measure or detect a low power wakeup-related signal of a neighboring cell supporting an intended network slice, using the low power wakeup receiver, on a frequency with a higher priority for cell reselection than a serving cell frequency, while the primary transceiver is in an ultra deep sleep power state. (Supplementary Note 61) The wireless terminal according to Supplementary Note 60, further comprising means for waking up the primary transceiver and initiating cell reselection utilizing Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurements using the primary transceiver when the quality of the low power wake-up related signal of a neighboring cell supporting the intended network slice is insufficient or a neighboring cell supporting the intended network slice is not detected.(Supplementary Note 62) The wireless terminal according to Supplementary Note 60 or 61, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wakeup related signals, and the low power wakeup receiver is used to receive the low power wakeup related signals at least while the primary transceiver is in the ultra-deep sleep power state. (Supplementary Note 63) The wireless terminal according to any one of Supplementary Notes 60 to 62, wherein the neighboring cell supporting the intended network slice is a cell supporting a Network Slice Access Stratum AS Group (NSAG) including the intended Single Network Slice Selection Assistance Information (S-NSSAI). (Supplementary Note 64) A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising: if there is a frequency with a higher priority for cell reselection than a serving cell frequency, attempting, using the low power wake-up receiver, to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice on the higher priority frequency while the primary transceiver is in an ultra-deep sleep power state.(Supplementary Note 65) A program for causing a computer to perform a method for a wireless terminal having a primary transceiver and a low power wake-up receiver, the program comprising: if there is a frequency with a higher priority for cell reselection than a serving cell frequency, attempting to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice using the low power wake-up receiver on the higher priority frequency while the primary transceiver is in an ultra deep sleep power state.

[0147] This application claims priority based on Japanese Patent Application No. 2023-139771, filed on August 30, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0148] 1 User Equipment (UE) 2 gNB 11 Main Radio (MR) 12 Low Power Wake-up Radio (LR) 21 Cell 2103 Baseband processor 2104 Application processor 2106 Memory 2107 Modules 2204 Processor 2205 Memory 2206 Modules

Claims

1. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for recording Minimization of Drive Tests (MDT) measurement results including measurement results of low power wakeup related signals using the low power wakeup receiver while at least the primary transceiver is in an ultra deep sleep power state.

2. The wireless terminal of claim 1, wherein the recording means is adapted to record measurements of the low power wake-up related signals when the primary transceiver enters the ultra deep sleep power state and / or when the primary transceiver wakes up from the ultra deep sleep power state.

3. The wireless terminal according to claim 1 or 2, further comprising: means for indicating, in a report of the MDT measurement result to a network, that the MDT measurement result relates to measurement of the low power consumption wake-up related signal.

4. A wireless terminal according to any one of claims 1 to 3, further comprising means for receiving an MDT measurement configuration from a network including a setting or indication of measurement logging of the low power consumption wake-up related signal, wherein the recording means is adapted to record measurement results of the low power consumption wake-up related signal in response to receiving the MDT measurement configuration.

5. The wireless terminal of any one of claims 1 to 4, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power consumption wake-up related signals, and the low power consumption wake-up receiver is used to receive the low power consumption wake-up related signals at least while the primary transceiver is in the ultra deep sleep power state.

6. The wireless terminal according to any one of claims 1 to 5, wherein the recording means is adapted to record measurement results of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) for MDT in addition to the measurement results of the low power consumption wake-up related signal.

7. The wireless terminal according to any one of claims 1 to 6, wherein the MDT is a Logged MDT.

8. A Radio Access Network (RAN) node comprising: means for transmitting Minimization of Drive Tests (MDT) measurement configuration to a wireless terminal, the measurement configuration including configuration or indication of measurement logging of low power wake-up related signals.

9. The RAN node of claim 8, wherein the MDT measurement configuration causes the wireless terminal to record MDT measurements including measurements of the low power wake-up related signals with a low power wake-up receiver of the wireless terminal while at least a primary transceiver of the wireless terminal is in an ultra-deep sleep power state.

10. The RAN node of claim 9, wherein the MDT measurement configuration causes the radio terminal to record measurements of the low power wake-up related signals when the primary transceiver enters the ultra deep sleep power state and / or when the primary transceiver wakes up from the ultra deep sleep power state.

11. The RAN node of claim 9 or 10, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception; the primary transceiver is not used for receiving the low power wake-up related signals; and the low power wake-up receiver is used to receive the low power wake-up related signals at least while the primary transceiver is in the ultra deep sleep power state.

12. The RAN node according to any one of claims 8 to 11, wherein the MDT measurement results include, in addition to the measurement results of the low power consumption wake-up related signals, measurement results of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB).

13. The RAN node according to any one of claims 8 to 12, wherein the MDT is a Logged MDT.

14. A method performed by a wireless terminal, comprising recording Minimization of Drive Tests (MDT) measurement results including measurements of low power wake-up related signals using a low power wake-up receiver while at least a primary transceiver is in an ultra-deep sleep power state.

15. A method performed by a Radio Access Network (RAN) node, comprising: transmitting a Minimization of Drive Tests (MDT) measurement configuration to a wireless terminal, the measurement configuration including configuration for measurement logging of low power wake-up related signals.

16. A program for causing a computer to perform a method for a wireless terminal, the method comprising recording Minimization of Drive Tests (MDT) measurement results including measurement results of low power wake-up related signals using a low power wake-up receiver while at least a primary transceiver is in an ultra deep sleep power state.

17. A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising: transmitting a Minimization of Drive Tests (MDT) measurement configuration to a wireless terminal, the measurement configuration including configuration for measurement logging of low power consumption wake-up related signals.

18. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for storing measurement results for IDLE / INACTIVE measurement reporting, including measurement results of low power wakeup related signals using the low power wakeup receiver while at least the primary transceiver is in an ultra deep sleep power state.

19. The wireless terminal of claim 18, further comprising means for indicating in said IDLE / INACTIVE measurement reporting to a network that the measurement results for said IDLE / INACTIVE measurement reporting relate to measurements of said low power consumption wake-up related signals.

20. A wireless terminal as described in claim 18 or 19, further comprising means for receiving information from a network indicating that IDLE / INACTIVE measurements include measurements of the low power consumption wake-up related signals, and the storing means is adapted to store measurement results of the low power consumption wake-up related signals in response to receiving the information.

21. The wireless terminal of claim 20, wherein the means for receiving is configured to receive the information via a Radio Resource Control (RRC) message dedicated to the wireless terminal or via system information common within a cell.

22. The wireless terminal of claim 20, wherein said receiving means is configured to receive said information via a RRCRelease message.

23. The wireless terminal of claim 20, wherein the means for receiving is configured to receive the information via a System Information Block type 1 (SIB1) or SIB type 11 (SIB11).

24. The wireless terminal of any one of claims 18 to 23, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wake-up related signals, and the low power wake-up receiver is used to receive the low power wake-up related signals at least while the primary transceiver is in the ultra deep sleep power state.

25. A Radio Access Network (RAN) node comprising: means for transmitting information to a wireless terminal indicating that the IDLE / INACTIVE measurements include measurements of low power wake-up related signals.

26. The RAN node of claim 25, wherein the information causes the wireless terminal to store measurement results for IDLE / INACTIVE measurement reporting, including measurements of the low power wake-up related signals using a low power wake-up receiver of the wireless terminal while at least a primary transceiver of the wireless terminal is in an ultra deep sleep power state.

27. The RAN node according to claim 25 or 26, wherein the means for transmitting is configured to transmit the information via a dedicated Radio Resource Control (RRC) message to the radio terminal or via common system information within a cell.

28. The RAN node according to claim 25 or 26, wherein the means for transmitting is configured to transmit the information via an RRCRelease message.

29. The RAN node of claim 25 or 26, wherein the means for transmitting is configured to transmit the information via a System Information Block type 1 (SIB1) or SIB type 11 (SIB11).

30. The RAN node of claim 26, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception; the primary transceiver is not used for receiving the low power wake-up related signals; and the low power wake-up receiver is used to receive the low power wake-up related signals at least while the primary transceiver is in the ultra deep sleep power state.

31. A method performed by a wireless terminal, comprising storing measurement results for IDLE / INACTIVE measurement reporting, including measurement results of low power wake-up related signals using a low power wake-up receiver while at least a primary transceiver is in an ultra-deep sleep power state.

32. A method performed by a Radio Access Network (RAN) node, comprising: transmitting information to a wireless terminal indicating that a low power consumption wake-up related signal is subject to IDLE / INACTIVE measurements.

33. A program for causing a computer to perform a method for a wireless terminal, the method comprising storing measurement results for IDLE / INACTIVE measurement reporting, including measurement results of low power wake-up related signals using a low power wake-up receiver while at least a primary transceiver is in an ultra deep sleep power state.

34. A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising: transmitting, to a wireless terminal, information indicating that a low power consumption wake-up related signal is subject to IDLE / INACTIVE measurement.

35. A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for performing a Small Data Transmission (SDT) procedure using the primary transceiver that has woken up from an ultra-deep sleep power state by skipping a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold.

36. The wireless terminal of claim 35, wherein said performing means is adapted to perform a comparison between a second measurement value obtained from measuring a low power wake-up related signal using said low power wake-up receiver and a second threshold value to determine whether a condition for initiating said SDT procedure is met.

37. The wireless terminal of claim 36, further comprising: means for receiving first configuration information from a network, the first configuration information indicating the second threshold value.

38. A radio terminal according to any one of claims 35 to 37, further comprising means for skipping a comparison of the first measurement value for SSB selection with a threshold in selecting a random access resource.

39. The wireless terminal of claim 38, further comprising means for selecting an SSB or a Physical Random Access Channel (PRACH) opportunity based on a second measurement value obtained from measuring a low power wake-up related signal using the low power wake-up receiver in the random access resource selection.

40. The wireless terminal of claim 39, further comprising means for receiving second configuration information from a network indicating association between multiple beams or multiple random access opportunities of the SSB and multiple beams of the low power consumption wake-up related signal.

41. The wireless terminal of claim 38, further comprising means for selecting an arbitrary SSB in the selection of the random access resource.

42. A wireless terminal according to any one of claims 35 to 41, further comprising means for receiving third configuration information indicating that a comparison of the first measured value with the first threshold is to be skipped, and wherein the initiating means is adapted to skip the comparison of the first measured value with the first threshold in response to receiving the third configuration information.

43. The wireless terminal according to any one of claims 35 to 42, further comprising means for waking up the primary transceiver in response to receiving uplink data from a Non-Access Stratum (NAS) layer, the uplink data being transmitted on a radio bearer for which SDT is enabled.

44. A radio terminal according to any one of claims 35 to 43, wherein the SDT procedure is a procedure that enables the radio terminal to transmit data or signaling while remaining in a Radio Resource Control (RRC)_INACTIVE state without transitioning to an RRC_CONNECTED state.

45. The wireless terminal of any one of claims 35 to 44, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving low power wake-up related signals, and the low power wake-up receiver is used to receive the low power wake-up related signals at least while the primary transceiver is in the ultra deep sleep power state.

46. ​​A Radio Access Network (RAN) node comprising: means for transmitting configuration information to a wireless terminal, the configuration information indicating that a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold is skipped in determining whether a condition for initiating a Small Data Transmission (SDT) procedure is satisfied.

47. The RAN node of claim 46, wherein the configuration information causes the wireless terminal to perform the SDT procedure with a primary transceiver woken up from an ultra-deep sleep power state by skipping a comparison of the first measurement value to the first threshold.

48. The RAN node of claim 46 or 47, further comprising means for transmitting configuration information to the radio terminal indicating a second threshold value, the second threshold value causing the radio terminal to compare a second measurement value obtained from measuring a low power wake-up related signal using a low power wake-up receiver with the second threshold value to determine whether a condition for initiating the SDT procedure is met.

49. A RAN node according to any one of claims 46 to 48, further comprising means for transmitting configuration information to the radio terminal indicating a third threshold value, the third threshold value being used in random access resource selection for SSB selection or Physical Random Access Channel (PRACH) opportunity selection based on a second measurement value obtained from measuring a low power wake-up related signal using a low power wake-up receiver of the radio terminal.

50. A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising: performing a Small Data Transmission (SDT) procedure using the primary transceiver that has woken up from an ultra-deep sleep power state by skipping a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold.

51. A method performed by a Radio Access Network (RAN) node, comprising: transmitting configuration information to a wireless terminal indicating that a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold is skipped in determining whether a condition for initiating a Small Data Transmission (SDT) procedure is met.

52. A program for causing a computer to execute a method for a wireless terminal having a primary transceiver and a low power wake-up receiver, the method comprising performing a Small Data Transmission (SDT) procedure using the primary transceiver that has woken up from an ultra-deep sleep power state by skipping a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold.

53. A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising: transmitting configuration information to a wireless terminal indicating that a comparison between a first measurement value obtained from a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurement and a first threshold value is skipped in determining whether a condition for initiating a Small Data Transmission (SDT) procedure is met.

54. A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for attempting to measure or detect low power wake-up related signals of a neighboring cell supporting an intended network slice if quality of a low power wake-up related signal of a serving cell or serving cell frequency measured using the low power wake-up receiver degrades while the primary transceiver is in an ultra deep sleep power state.

55. The wireless terminal of claim 54, further comprising means for waking up the primary transceiver and initiating cell reselection utilizing Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurements using the primary transceiver when the quality of the low power consumption wake-up related signal of a neighboring cell supporting the intended network slice is insufficient or a neighboring cell supporting the intended network slice is not detected.

56. The wireless terminal of claim 54 or 55, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wake-up related signals, and the low power wake-up receiver is used to receive the low power wake-up related signals at least while the primary transceiver is in the ultra deep sleep power state.

57. A wireless terminal as described in any one of claims 54 to 56, wherein the neighboring cell supporting the intended network slice is a cell supporting a Network Slice Access Stratum AS Group (NSAG) containing the intended Single Network Slice Selection Assistance Information (S-NSSAI).

58. A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising attempting to measure or detect low power wake-up related signals of a neighboring cell supporting an intended network slice if quality of a low power wake-up related signal of a serving cell or serving cell frequency measured using the low power wake-up receiver degrades while the primary transceiver is in an ultra deep sleep power state.

59. A program for causing a computer to perform a method for a wireless terminal having a primary transceiver and a low power wake-up receiver, the method comprising attempting to measure or detect low power wake-up related signals of a neighboring cell supporting an intended network slice if quality of a low power wake-up related signal of a serving cell or serving cell frequency measured using the low power wake-up receiver degrades while the primary transceiver is in an ultra deep sleep power state.

60. A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for attempting, if a frequency has a higher priority for cell reselection than a serving cell frequency, to measure or detect, using the low power wake-up receiver, a low power wake-up related signal of a neighboring cell supporting an intended network slice while the primary transceiver is in an ultra deep sleep power state.

61. The wireless terminal of claim 60, further comprising means for waking up the primary transceiver and initiating cell reselection utilizing Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) measurements using the primary transceiver when the quality of the low power consumption wake-up related signal of a neighboring cell supporting the intended network slice is insufficient or a neighboring cell supporting the intended network slice is not detected.

62. The wireless terminal of claim 60 or 61, wherein the primary transceiver is used for signal transmission and reception including Physical Uplink Control Channel (PUCCH) transmission, Physical Uplink Shared Channel (PUSCH) transmission, Physical Downlink Control Channel (PDCCH) reception, and Physical Downlink Shared Channel (PDSCH) reception, the primary transceiver is not used for receiving the low power wake-up related signals, and the low power wake-up receiver is used to receive the low power wake-up related signals at least while the primary transceiver is in the ultra deep sleep power state.

63. A wireless terminal as claimed in any one of claims 60 to 62, wherein the neighboring cell supporting the intended network slice is a cell supporting a Network Slice Access Stratum AS Group (NSAG) containing the intended Single Network Slice Selection Assistance Information (S-NSSAI).

64. A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising: if there is a frequency with a higher priority for cell reselection than a serving cell frequency, attempting, using the low power wake-up receiver, to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice on the higher priority frequency while the primary transceiver is in an ultra deep sleep power state.

65. A program for causing a computer to perform a method for a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising: if there is a frequency with a higher priority for cell reselection than a serving cell frequency, attempting, using the low power wake-up receiver, to measure or detect a low power wake-up related signal of a neighboring cell supporting an intended network slice on the higher priority frequency while the primary transceiver is in an ultra deep sleep power state.

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