Wireless access network node, wireless terminal, and method thereof

Abstract

This radio access network (RAN) node notifies an adjacent RAN node of a support or transmission status of a low power consumption wake-up-related signal in a first cell of the RAN node, and receives, from the adjacent RAN node, a support or transmission status of a low power consumption wake-up-related signal in a second cell of the adjacent RAN node. This can contribute, for example, to solving a problem pertaining to the implementation of 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

Radio access network node, radio terminal, 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 issues. Some of these issues relate to RRM measurements and / or cell reselection for UEs that support LP-WUS and LP-WUR. Although Non-Patent Documents 1-15 describe RRM measurements and cell reselection for UEs that support LP-WUS and LP-WUR, the details of the procedures and signaling related to these are still not sufficiently clear.

[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 Radio Access Network (RAN) node is configured to notify a neighboring RAN node of support for or transmission status of a low power wake-up related signal in a first cell of the RAN node, and to receive from the neighboring RAN node support for or transmission status of the low power wake-up related signal in a second cell of the neighboring RAN node.

[0022] In a second aspect, a method performed by a RAN node includes notifying a neighboring RAN node of support or transmission status of low power wake-up related signals in a first cell of the RAN node.

[0023] In a third aspect, a wireless terminal has a primary transceiver and a low power wake-up receiver and is configured to receive information from a network in a first cell indicating support or transmission status of a low power wake-up related signal in a second cell.

[0024] In a fourth aspect, a method performed by a wireless terminal includes receiving information from a network in a first cell indicating support or transmission status of low power wake-up related signals in a second cell.

[0025] In a fifth aspect, a RAN node is configured to transmit information to a radio terminal in a first cell of said RAN node indicating support or transmission status of low power wake-up related signals in a second cell of a neighboring RAN node.

[0026] In a sixth aspect, a method performed by a RAN node includes transmitting information to a radio terminal in a first cell of the RAN node indicating support or transmission status of low power wake-up related signals in a second cell of a neighboring RAN node.

[0027] In a seventh aspect, a RAN node is configured to transmit information regarding low power wake-up related signals to a wireless terminal in a first cell, the information indicating whether measurements of the low power wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra-deep sleep power state should be performed within a first frequency of the first cell or should be performed on both the first frequency and a second frequency different from the first frequency.

[0028] In an eighth aspect, a method performed by a RAN node includes transmitting information regarding low power wake-up related signals to a wireless terminal in a first cell, the information indicating whether measurements of the low power wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra-deep sleep power state should be performed within a first frequency of the first cell or should be performed on both the first frequency and a second frequency different from the first frequency.

[0029] In a ninth aspect, a wireless terminal has a primary transceiver and a low power wake-up receiver and is configured to receive information from a network in a first cell regarding low power wake-up related signals, the information indicating whether measurements of the low power wake-up related signals for radio resource management measurements while the primary transceiver is in an ultra-deep sleep power state should be performed within a first frequency of the first cell or should be performed on both the first frequency and a second frequency different from the first frequency.

[0030] In a tenth aspect, a method performed by a wireless terminal includes receiving information from a network in a first cell regarding low power wake-up related signals, the information indicating whether measurements of the low power wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra-deep sleep power state should be performed within a first frequency of the first cell or should be performed on both the first frequency and a second frequency different from the first frequency.

[0031] In an eleventh aspect, the RAN node is configured to transmit information regarding low power wake-up related signals to a wireless terminal in a first cell, said information indicating whether measurements of SSBs are required by a low power wake-up receiver of said wireless terminal while a primary transceiver of said wireless terminal is in an ultra-deep sleep power state.

[0032] In a twelfth aspect, a method performed by a RAN node includes transmitting information related to low power wake-up related signals to a wireless terminal in a first cell, the information indicating whether measurements of SSBs are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra-deep sleep power state.

[0033] In a thirteenth aspect, a wireless terminal has a primary transceiver and a low power wake-up receiver and is configured to receive information from a network in a first cell regarding low power wake-up related signals, the information indicating whether measurements of SSB by the low power wake-up receiver are required while the primary transceiver is in an ultra-deep sleep power state.

[0034] In a fourteenth aspect, a method performed by a wireless terminal includes receiving information from a network in a first cell regarding low power wake-up related signals, the information indicating whether measurements of SSB by the low power wake-up receiver are required while the primary transceiver is in an ultra-deep sleep power state.

[0035] In a fifteenth aspect, a wireless terminal has a primary transceiver and a low power wakeup receiver and is configured to perform cell reselection using the low power wakeup receiver. More specifically, for the cell reselection, the wireless terminal is configured to measure an SSB of a serving cell using the low power wakeup receiver when a reception quality of a low power wakeup-related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state. Furthermore, the wireless terminal is configured to measure an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup-related signal or the SSB of the serving cell falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

[0036] In a sixteenth aspect, a method performed by a wireless terminal including a primary transceiver and a low power wakeup receiver includes performing cell reselection using the low power wakeup receiver, wherein performing the cell reselection includes measuring an SSB of a serving cell using the low power wakeup receiver when a reception quality of a low power wakeup-related signal of the serving cell falls below a first threshold while the primary transceiver is in an ultra deep sleep power state, and performing the cell reselection further includes measuring an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup-related signal or the SSB of the serving cell falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

[0037] In a seventeenth aspect, a wireless terminal has a primary transceiver and a low power wakeup receiver and is configured to perform cell reselection using the low power wakeup receiver. More specifically, for the cell reselection, the wireless terminal is configured to measure an SSB on a first frequency of a serving cell using the low power wakeup receiver when a reception quality of a low power wakeup-related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state. Furthermore, the wireless terminal is configured to measure an SSB on a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the serving cell or a reception quality of the SSB on the first frequency falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

[0038] In an eighteenth aspect, a method performed by a wireless terminal including a primary transceiver and a low power wakeup receiver includes performing cell reselection using the low power wakeup receiver, wherein performing the cell reselection includes measuring an SSB on a first frequency of a serving cell of the wireless terminal while the primary transceiver is in an ultra deep sleep power state if a reception quality of a low power wakeup-related signal of the serving cell falls below a first threshold, and further including measuring an SSB on a second frequency different from the first frequency while the primary transceiver is in the ultra deep sleep power state if a reception quality of the low power wakeup-related signal of the serving cell or a reception quality of the SSB on the first frequency falls below a second threshold.

[0039] In a nineteenth aspect, a wireless terminal has a primary transceiver and a low power wake-up receiver and is configured to preferentially select neighboring cells that support or transmit low power wake-up related signals in cell reselection over neighboring cells that do not support or transmit the low power wake-up related signals.

[0040] In a twentieth aspect, a method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver includes preferentially selecting neighboring cells that support or transmit low power wake-up related signals in cell reselection compared to neighboring cells that do not support or transmit the low power wake-up related signals.

[0041] In a twenty-first aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is further configured, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, to change the primary transceiver to an ultra-deep sleep power state and switch to reception by the low power wake-up receiver if the new serving cell supports or transmits low power wake-up related signals.

[0042] In a twenty-second aspect, a method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver comprises, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power wake-up receiver if the new serving cell supports or transmits low power wake-up related signals.

[0043] In a twenty-third aspect, the RAN node is configured to transmit information regarding a low power wake-up related signal to a wireless terminal in a first cell, the information indicating a coverage mismatch where coverage of the low power wake-up related signal transmitted in the first cell is less than coverage of an SSB transmitted in the first cell.

[0044] In a twenty-fourth aspect, a method performed by a RAN node includes transmitting information regarding a low power wake-up related signal to a wireless terminal in a first cell, the information indicating a coverage mismatch where coverage of the low power wake-up related signal transmitted in the first cell is less than coverage of an SSB transmitted in the first cell.

[0045] In a twenty-fifth aspect, a wireless terminal has a primary transceiver and a low power wake-up receiver and is configured to receive information from a network in a first cell regarding a low power wake-up related signal, the information indicating a coverage mismatch in which coverage of the low power wake-up related signal transmitted in the first cell is less than coverage of an SSB transmitted in the first cell.

[0046] In a twenty-sixth aspect, a method performed by a wireless terminal includes receiving information from a network in a first cell regarding a low power wake-up related signal, the information indicating a coverage mismatch where coverage of the low power wake-up related signal transmitted in the first cell is less than coverage of an SSB transmitted in the first cell.

[0047] In a twenty-seventh aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is configured to determine whether to use measurements of the SSBs or the low power wake-up related signals for cell reselection based on a difference between reception quality of the SSBs and reception quality of the low power wake-up related signals in a serving cell.

[0048] In a twenty-eighth aspect, a method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver is configured to determine whether to use measurements of the SSB or measurements of the low power wake-up related signals for cell reselection based on a difference between the reception quality of the SSB and the reception quality of the low power wake-up related signals in a serving cell.

[0049] In a twenty-ninth aspect, a wireless terminal includes a primary transceiver and a low power wake-up receiver, and is configured to attempt cell reselection based on measurements of low power wake-up related signals using the low power wake-up receiver while the primary transceiver is in an ultra-deep sleep power state, and to initiate cell reselection based on measurements of SSBs if no suitable cell is found based on measurements of the low power wake-up related signals.

[0050] In a thirtieth aspect, a method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver includes attempting cell reselection based on measurements of low power wake-up related signals using the low power wake-up receiver while the primary transceiver is in an ultra-deep sleep power state, and initiating cell reselection based on measurements of SSBs if a suitable cell is not found based on measurements of the low power wake-up related signals.

[0051] In a thirty-first aspect, a distributed unit of a RAN node is configured to transmit information to a central unit of the RAN node indicating support or transmission status of low power wake-up related signals in a first cell provided by the distributed unit.

[0052] In a thirty-second aspect, a method performed by a distributed unit of a RAN node includes transmitting information to a central unit of the RAN node indicating support or transmission status of low power wake-up related signals in a first cell provided by the distributed unit.

[0053] In a thirty-third aspect, a central unit of a RAN node is configured to receive, from a distributed unit of said RAN node, information indicating support or transmission status of a low power wake-up related signal in a first cell provided by said distributed unit.

[0054] In a thirty-fourth aspect, a method performed by a distributed unit of a RAN node includes receiving, from the distributed unit of the RAN node, information indicating support or transmission status of low power wake-up related signals in a first cell provided by the distributed unit.

[0055] In a thirty-fifth aspect, a distributed unit of a RAN node is configured to transmit, to a central unit of the RAN node, information indicating a coverage mismatch, where coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is smaller than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

[0056] In a thirty-sixth aspect, a method performed by a distributed unit of a RAN node includes transmitting information to a central unit of the RAN node indicating a coverage mismatch, where coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is less than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

[0057] In a thirty-seventh aspect, a central unit of a RAN node is configured to receive, from a distributed unit of the RAN node, information indicating a coverage mismatch in which coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is smaller than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

[0058] In a thirty-eighth aspect, a method performed by a distributed unit of a RAN node includes receiving information from the distributed unit of the RAN node indicating a coverage mismatch where coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is less than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

[0059] In a thirty-ninth 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.

[0060] 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.

[0061] FIG. 1 illustrates an example configuration of a wireless communication system according to one or more embodiments. FIG. 2 illustrates an example of paging when a UE is in an ultra-deep sleep power state according to one or more embodiments. FIG. 3 illustrates an example of cell reselection using LP-WUR according to one or more embodiments. FIG. 4 illustrates a sequence diagram of an example of UE and gNB operation according to one or more embodiments. FIG. 5 illustrates an example of signaling between a distributed unit and a central unit according to one or more embodiments. FIG. 6 illustrates an example of UE and gNB operation according to one or more embodiments. FIG. 7 illustrates an example of UE and gNB operation according to one or more embodiments. FIG. 8 illustrates a flowchart of an example UE operation according to one or more embodiments. FIG. 9 illustrates an example of UE operation according to one or more embodiments. FIG. 10 illustrates an example of UE operation according to one or more embodiments. FIG. 11 illustrates an example of UE and gNB operation according to one or more embodiments. FIG. 12 illustrates an example of UE operation according to one or more embodiments. 1 illustrates an example of signaling between a distributed unit and a central unit, in accordance with one or more embodiments; 2 illustrates a flowchart illustrating an example of a UE operation, in accordance with one or more embodiments; 3 illustrates a flowchart illustrating an example of a UE operation, in accordance with one or more embodiments; 4 illustrates a block diagram illustrating an example of a UE configuration, in accordance with one or more embodiments; and 5 illustrates a block diagram illustrating an example of a gNB configuration, in accordance with one or more embodiments.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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).

[0069] 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.

[0070] 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.

[0071] 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).

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] First Embodiment This embodiment relates to RRM measurement and cell reselection in RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0083] FIG. 4 shows an example of signaling related to LP-WUS and LP-WUR. In step 401, gNB 2 transmits information indicating the support or transmission status of low power wake-up related signals (e.g., LP-WUS, LP-SS, or both) in one or more neighboring cells to UE 1 in cell 21. UE 1 receives the information transmitted from gNB 2. The information may indicate whether low power wake-up related signals are transmitted for each neighboring cell or for each frequency (e.g., Radio Frequency (RF) carrier or NR channel). Each neighboring cell may be provided by gNB 2 (e.g., gNB 2A) or another gNB (e.g., gNB 2B). Furthermore, gNB 2 may transmit information indicating the support or transmission status of low power wake-up related signals in cell 21 to UE 1 in cell 21. The low power wake-up related signals may be referred to as power-saving wake-up related signals.

[0084] The gNB 2 may transmit this information to the UE 1 via a dedicated RRC message or via common system information (e.g., MIB or any SIB) within the cell 21. The UE 1 may receive this information using the MR 11. The dedicated RRC message may be an RRC Release message to release or suspend the RRC connection of the UE 1. The system information may be broadcast periodically within the cell 21 or on-demand (i.e., upon request from UE(s) that are RRC_IDLE or RRC_INACTIVE).

[0085] UE 1 may use the information of step 401 to determine how to perform RRM measurements in RRC_IDLE or RRC_INACTIVE state. Additionally or alternatively, UE 1 may use the information of step 401 to determine how to perform cell reselection in RRC_IDLE or RRC_INACTIVE state.

[0086] More specifically, if the information indicates that LP-WUS (and LP-SS) is supported in one or more neighboring cells, UE 1 may initiate RRM measurements of LP-WUS or LP-SS in or on the frequencies of neighboring cells in response to degradation of the reception quality (e.g., signal strength, received power) of LP-WUS or LP-SS in serving cell 21. Additionally or alternatively, UE 1 may use the measurements of LP-WUS or LP-SS in neighboring cells to evaluate cell reselection criteria.

[0087] On the other hand, if the information indicates that LP-WUS (and LP-SS) are not supported in one or more neighboring cells, UE 1 may initiate RRM measurements of the SSB of the neighboring cells (and the serving cell) in response to degradation in the reception quality (e.g., signal strength, received power) of the LP-WUS or LP-SS of the serving cell 21. Additionally or alternatively, UE 1 may use the measurements of the SSB of the neighboring cells to evaluate cell reselection criteria.

[0088] UE 1 may take into account the information in step 401 to preferentially select neighboring cells that support or transmit LP-WUS (or LP-SS) in cell reselection over neighboring cells that do not support or transmit LP-WUS (or LP-SS). For example, if SIB2 includes the rangeToBestCell field, UE 1 may perform cell reselection to a cell that supports or transmits LP-WUS (or LP-SS) among multiple candidate cells whose R value, calculated using the average RSRP, is within the range specified in the rangeToBestCell field from the R value of the highest cell.

[0089] According to the operation described with reference to Figure 4, gNB 2 can inform UE 1 in its own cell of information regarding support or transmission status of LP-WUS / LP-SS in neighboring cells. This can assist RRM measurements and cell reselection by UE 1 that supports low power consumption mechanisms using LP-WUS and LP-WUR. This also contributes to clarifying signaling details regarding low power consumption mechanisms using LP-WUS and LP-WUR.

[0090] 5 shows an example of signaling between gNBs. In step 501, a gNB 2A sends information to a neighboring gNB 2B indicating the support or transmission status of low power consumption wake-up related signals in one or more cells provided by the gNB 2A. The information may indicate the support or transmission status of low power consumption wake-up related signals on a cell-by-cell or frequency-by-frequency basis.

[0091] In step 502, the gNB 2A receives from the gNB 2B information indicating the support or transmission status of low power consumption wake-up related signals in one or more cells provided by the neighboring gNB 2B. The information may indicate the support or transmission status of low power consumption wake-up related signals on a cell-by-cell or frequency-by-frequency basis. The gNB 2A may use the information received from the gNB 2B to generate information to be transmitted to the UE 1 in step 401 of Figure 4. Additionally or alternatively, the gNB 2A may use the information received from the gNB 2B to generate configuration information related to RRM measurements and cell reselection to be provided to the UE 1 in its cell 21A.

[0092] The order of steps 501 and 502 is not limited. The control message carrying information in each of steps 501 and 502 may be, for example, an XN SETUP REQUEST, an XN SETUP RESPONSE, an NG-RAN NODE CONFIGURATION UPDATE, or an NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE message.

[0093] According to the operation described with reference to Figure 5, gNB 2A can exchange or share information regarding support or transmission status of LP-WUS / LP-SS with neighboring gNB 2B, which contributes to clarifying the signaling details regarding the low power consumption mechanism using LP-WUS and LP-WUR.

[0094] The operation described with reference to FIG. 5 enables the exchange or sharing of information regarding the support or transmission status of LP-WUS / LP-SS between different gNBs. A gNB 2 may be composed of a CU (e.g., gNB-CU) and one or more DUs (e.g., gNB-DUs). In this case, the DU may have a function related to UE ultra-deep sleep, including LP-WUS / LP-SS transmission. FIG. 6 shows an example of signaling between a CU and a DU. In step 621, the DU 601 transmits information regarding the support or transmission status of LP-WUS / LP-SS in the cell served by the DU 601 to the CU 602 using a message (e.g., F1 SETUP REQUEST, GNB-DU CONFIGURATION UPDATE) on the CU-DU interface (e.g., F1 interface). The CU 602 may request the DU 601 to transmit information regarding the support or transmission status of LP-WUS / LP-SS via an F1 message (e.g., RESOURCE STATUS REQUEST). The DU 601 may transmit the information to the CU 602 in an F1 message in response to a request from the CU 602.

[0095] Second Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0096] 7 shows an example of signaling related to LP-WUS and LP-WUR. In step 701, the gNB 2 transmits information to the UE 1 in the cell 21 indicating what type of RRM measurements (e.g., serving cell, intra-frequency, inter-frequency) will be performed by or using the LR 12. For example, the gNB 2 informs the UE 1 whether RRM measurements for low power wake-up related signals while the LR 11 is in the ultra-deep sleep power state should be performed only in the serving cell 21, within the frequency of the serving cell 21, or on a different frequency (e.g., a neighboring cell frequency) in addition to the serving cell frequency. The low power wake-up related signals may be one or both of LP-WUS and LP-SS.

[0097] RRM measurements of low power wake-up related signals in the serving cell while the MR 11 is in the ultra-deep sleep power state may be a mandatory function imposed on the UE 1 supporting the low power mechanism. In this case, the information in step 701 may indicate to the UE 1 whether the RRM measurements of low power wake-up related signals need to be performed within the frequency of the serving cell 21 or on a different frequency in addition to the serving cell frequency. On the other hand, if the information is not transmitted from the gNB 2, the UE 1 may determine that the RRM measurements of low power wake-up related signals need to be performed (only) in the serving cell.

[0098] That is, the information in step 701 may indicate whether or not the RRM measurement for the low power consumption wake-up related signal while the MR 11 is in the ultra deep sleep power state needs to be performed on a cell other than the serving cell 21. Additionally or alternatively, the information in step 701 may indicate whether or not the RRM measurement for the low power consumption wake-up related signal while the MR 11 is in the ultra deep sleep power state needs to be performed within the frequency of the serving cell 21 in addition to the serving cell 21. Additionally or alternatively, the information in step 701 may indicate whether or not the RRM measurement for the low power consumption wake-up related signal while the MR 11 is in the ultra deep sleep power state needs to be performed on a frequency different from the serving cell frequency in addition to the serving cell 21 or the serving cell frequency.

[0099] The gNB 2 may transmit the information to the UE 1 via a dedicated RRC message or via common system information (e.g., MIB or any SIB) within the cell 21. The UE 1 may receive the information using the MR 11. The dedicated RRC message may be an RRC Release message to release or suspend the RRC connection of the UE 1. The dedicated RRC message may be an RRC Reconfiguration message. The system information may be broadcast periodically within the cell 21 or on-demand (i.e., upon request from UE(s) that are RRC_IDLE or RRC_INACTIVE).

[0100] UE 1 performs RRM measurements of one or both of LP-WUS and LP-SS according to notification or configuration from gNB 2 (step 701). If gNB 2 notifies or configures UE 1 that RRM measurements need to be performed only in the serving cell, or if UE 1 detects this, UE 1 may measure LP-WUS or LP-SS in the serving cell 21. In other words, UE 1 may be exempted or relaxed from measuring LP-WUS or LP-SS in neighboring cells on the frequency of the serving cell 21 and in cells on different frequencies. In this case, UE 1 does not need to evaluate cell reselection criteria until the measurement results of the serving cell 21 satisfy a predetermined condition (e.g., fall below a threshold).

[0101] When RRM measurements are required within the frequency of the serving cell, the UE 1 may measure the LP-WUS or LP-SS within the frequency of the serving cell 21. That is, the UE 1 may be exempted or relaxed from measuring the LP-WUS or LP-SS at a frequency different from the frequency of the serving cell 21. In addition, the UE 1 may evaluate intra-frequency cell reselection criteria based on measurements of the LP-WUS or LP-SS within the frequency of the serving cell 21, but may be exempted or relaxed from evaluating inter-frequency cell reselection criteria based on measurements of the LP-WUS or LP-SS.

[0102] If inter-frequency measurements are required, the information in step 701 may explicitly specify one or more frequencies to be measured. The UE 1 may not perform inter-frequency measurements on frequencies not specified by the information. In other words, the UE 1 may be exempted or relaxed from performing inter-frequency measurements on frequencies not specified by the information. More specifically, even if there is a frequency that is preferred over the frequency of the serving cell 21 in cell reselection, if the frequency is not explicitly specified by the gNB 2, the UE 1 may be exempt from performing LP-WUS or LP-SS measurements on the preferred frequency during RRM measurements in the ultra-deep sleep power state. If the gNB 2 does not transmit information indicating (or explicitly indicating) which type of RRM measurements are to be performed by or using the LR 12, the UE 1 may perform only RRM measurements within the serving cell frequency, only inter-frequency RRM measurements, or both.

[0103] According to the operation described with reference to Figure 7, the gNB 2 can inform or configure the UE 1 whether the RRM measurements (and cell reselection) performed by the UE 1 when the MR 11 is in the ultra-deep sleep power state are limited to intra-frequency measurements or whether inter-frequency measurements are required in addition to intra-frequency measurements. This makes it possible to relax the RRM measurements (and cell reselection) using LP-WUS or LP-SS. This also contributes to clarifying the signaling details regarding the low power consumption mechanisms using LP-WUS and LP-WUR.

[0104] Third Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0105] Figure 8 shows an example of signaling related to LP-WUS and LP-WUR. In step 801, the gNB 2 transmits to the UE 1 information indicating whether measurements of the SSB by the LR 12 are required while the MR 11 is in the ultra-deep sleep power state. The procedure of Figure 8 may be performed when the LR 12 of the UE 1 has the capability to receive at least a portion of the SSB. Note that this capability may further include or be replaced by a measurement capability to perform measurements on at least a portion of the SSB.

[0106] The UE 1 may transmit information indicating that the LR 12 of the UE 1 has the capability to receive at least a portion of the SSB to the gNB 2. The UE 1 may transmit the information indicating this capability using an RRC message. More specifically, the UE 1 may transmit the information indicating this capability via an RRCSetupRequest message or an RRCSetupComplete message in the RRC Setup procedure. Alternatively, the UE 1 may transmit the information indicating this capability via a UECapabilityInformation message in the UE capability transfer procedure.

[0107] The gNB 2 may transmit the information to the UE 1 via a dedicated RRC message or via common system information (e.g., MIB or any SIB) within the cell 21. The UE 1 may receive the information using the MR 11. The dedicated RRC message may be an RRC Release message to release or suspend the RRC connection of the UE 1. The dedicated RRC message may be an RRC Reconfiguration message. The system information may be broadcast periodically within the cell 21 or on-demand (i.e., upon request from UE(s) that are RRC_IDLE or RRC_INACTIVE).

[0108] UE 1 performs RRM measurements while MR 11 is in the ultra-deep sleep power state according to notification or configuration from gNB 2 (step 801). If gNB 2 notifies or configures UE 1 that SSB measurements using LR 12 are required, UE 1 uses LR 12 to measure the SSB quality (e.g., reception strength, SS-RSRP, SS-RSRQ) of the serving cell 21 in addition to the LP-WUR or LP-SS quality (e.g., reception strength) of the serving cell 21. Furthermore, UE 1 may use LR 12 to measure the SSB quality of a cell other than the serving cell 21 in the frequency of the serving cell 21 (i.e., intra-frequency measurement). Furthermore, UE 1 may use LR 12 to measure the SSB quality of a frequency other than the frequency of the serving cell 21 (i.e., inter-frequency measurement).

[0109] If the gNB 2 notifies or configures the UE 1 that SSB measurements by the LR 12 are required, the UE 1 may perform cell reselection based on the results of the SSB measurements. In this case, the cell reselection criteria may be the same as the existing cell reselection criteria.

[0110] According to the operation described with reference to Figure 8, the gNB 2 can inform or configure the UE 1 whether or not SSB needs to be measured by the LR 12 of the UE 1 when the MR 11 is in the ultra-deep sleep power state, which contributes to clarifying the signaling details regarding the low power consumption mechanism in implementations where the LR 12 has SSB reception capability.

[0111] Fourth Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0112] FIG. 9 shows an example of the operation of UE 1. In this example, LR 12 of UE 1 has the capability to receive at least a portion of an SSB. In step 901, if the reception quality (e.g., signal strength, received power) of the LP-WUS or LP-SS of a serving cell (e.g., cell 21) is below a first threshold, UE 1 measures the SSB of the serving cell using LR 12. In step 902, if the reception quality (e.g., received strength, SS-RSRP, SS-RSRQ) of the LP-WUS, LP-SS, or SSB of the serving cell is below a second threshold, UE 1 measures the SSB of a neighbor cell using the same frequency as the serving cell using LR 12. If the second threshold is a threshold for the reception quality of the LP-WUS or LP-SS, the second threshold is lower than the first threshold. Specifically, the UE 1 may use the LR 12 to measure the SSB of the serving cell as well as the SSB of a neighboring cell that uses the same frequency as the serving cell.

[0113] In the procedure of Fig. 9, if the reception quality of the LP-WUS or LP-SS of the serving cell does not fall below a first threshold, UE 1 may perform cell reselection based on the LP-WUS or LP-SS measurement without performing SSB measurement. On the other hand, if the reception quality of the LP-WUS or LP-SS of the serving cell falls below the first threshold, UE 1 may perform cell reselection based on the SSB measurement. In this case, the cell reselection criteria may be the same as the existing cell reselection criteria.

[0114] According to the operation described with reference to Figure 9, UE 1 starts SSB measurement of the serving cell using LR 12 in response to a deterioration in the serving cell quality obtained using LR 12, and starts SSB measurement within the serving cell frequency using LR 12 in response to further deterioration of the serving cell quality obtained using LR 12. This helps to clarify the details of the RRM measurement operation of UE 1 using LP-WUS and LP-WUR.

[0115] FIG. 10 shows another example of the operation of UE 1. Similar to the example of FIG. 9, in this example, LR 12 of UE 1 has the capability to receive at least a portion of an SSB. In step 1001, if the reception quality of the LP-WUS or LP-SS of a serving cell (e.g., cell 21) is below a first threshold, UE 1 measures the SSB on a first frequency of the serving cell using LR 12. In step 1002, if the reception quality of the LP-WUS or LP-SS of the serving cell or the reception quality of the SSB on the first frequency is below a second threshold, UE 1 measures the SSB on a second frequency different from the first frequency using LR 12. If the second threshold is a threshold for the reception quality of the LP-WUS or LP-SS, the second threshold is lower than the first threshold. Specifically, UE 1 may measure the SSB on the second frequency in addition to the first frequency using LR 12. Alternatively, if the reception quality of the LP-WUS or LP-SS of the serving cell is below a second threshold, the UE 1 may skip the SSB measurement on the first frequency and perform the SSB measurement on the second frequency.

[0116] In the procedure of Fig. 10, if the reception quality of the LP-WUS or LP-SS of the serving cell does not fall below the first threshold, the UE 1 may perform cell reselection based on the measurement result of the LP-WUS or LP-SS by the LR 12 without performing SSB measurement. On the other hand, if the reception quality of the LP-WUS or LP-SS of the serving cell falls below the first threshold, the UE 1 may perform cell reselection based on the measurement result of the SSB by the LR 12. In this case, the cell reselection criteria may be the same as the existing cell reselection criteria.

[0117] According to the operation described with reference to Figure 10, UE 1 initiates intra-serving cell frequency SSB measurements using LR 12 in response to a degradation in serving cell quality obtained using LR 12, and initiates inter-frequency SSB measurements using LR 12 in response to further degradation in serving cell quality obtained using LR 12. This helps clarify the details of the RRM measurement operation of UE 1 using LP-WUS and LP-WUR.

[0118] Fifth Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0119] 11 shows an example of the operation of UE 1. In step 1101, UE 1 wakes up MR 11 from the ultra-deep sleep power state and performs RRM measurements required for cell reselection using MR 11. For example, UE 1 may trigger the wake-up of MR 11 based on measurements of LP-WUS or LP-SS using LR 12 while MR 11 is in the ultra-deep sleep power state. Specifically, UE 1 may trigger the wake-up of MR 11 if the reception quality (e.g., signal strength, received power) of LP-WUS or LP-SS falls below a threshold.

[0120] In step 1102, the UE 1 starts the evaluation process of cell reselection. The evaluation process and criteria of cell reselection in step 1102 may take into account the SSB measurement results by the MR 11, similar to the evaluation process and criteria of existing cell selection.

[0121] In step 1103, UE1 preferentially selects neighboring cells that support or transmit LP-WUS in cell reselection over neighboring cells that do not support or transmit LP-WUS. For example, if SIB2 includes the rangeToBestCell field, UE1 may perform cell reselection to a cell that supports or transmits LP-WUS among multiple candidate cells whose R value, calculated using the average RSRP, is within the range specified in the rangeToBestCell field from the R value of the highest cell.

[0122] The UE 1 may determine whether the neighboring cell supports LP-WUS as follows: In one example, as described in the first embodiment (FIG. 4), the UE 1 may receive information indicating the support status of LP-WUS in the neighboring cell from the serving cell. Additionally or alternatively, the UE 1 may know whether the neighboring cell supports LP-WUS based on receiving the LP-WUS or LP-SS of the neighboring cell using the LR 12. Additionally or alternatively, the UE 1 may receive system information (e.g., MIB or any SIB) broadcast in the neighboring cell and detect whether the neighboring cell supports LP-WUS from the system information.

[0123] After moving to a new serving cell by cell reselection using measurements by MR 11, if the new serving cell supports or transmits LP-WUS, UE 1 may change MR 11 to an ultra-deep sleep power state and switch to reception by LR 12. In other words, UE 1 may transition MR 11 to an ultra-deep sleep power state after cell reselection without any explicit instruction from a gNB (e.g., gNB 2B) that manages the new serving cell.

[0124] According to the operation described with reference to Figure 11, UE 1 can preferentially select neighboring cells that support or transmit LP-WUS in cell reselection compared to neighboring cells that do not support or transmit LP-WUS, which helps clarify the details of the cell reselection operation of UE 1 using LP-WUS and LP-WUR.

[0125] Sixth Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0126] FIG. 12 shows an example of the operation of UE 1. In step 1201, cell reselection is performed using measurements by MR 11. UE 1 may wake up MR 11 from the ultra-deep sleep power state and use MR 11 to perform RRM measurements required for cell reselection. UE 1 may trigger the wake-up of MR 11 based on measurements of LP-WUS or LP-SS using LR 12 while MR 11 is in the ultra-deep sleep power state. UE 1 may trigger the wake-up of MR 11 if the reception quality (e.g., signal strength, received power) of LP-WUS or LP-SS falls below a threshold. The measurements by MR 11 may include measurements of SSB quality (e.g., signal strength, SS-RSRP, SS-RSRQ) and CSI-RS quality (e.g., CSI-RSRP, CSI-RSRQ).

[0127] In step 1202, after moving to a new serving cell by cell reselection using measurements by MR 11, if the new serving cell supports LP-WUS or transmits LP-WUS (or LP-SS), UE 1 changes MR 11 to an ultra-deep sleep power state and switches to reception by LR 12.

[0128] UE 1 may transition MR 11 to the ultra-deep sleep power state after cell reselection without an explicit instruction from a gNB (e.g., gNB 2B) that manages a new serving cell. UE 1 may transition MR 11 to the ultra-deep sleep power state after cell reselection without checking whether the condition for transitioning MR 11 to the ultra-deep sleep power state is met. Alternatively, UE 1 may receive information indicating (or for determining) whether confirmation of the condition is necessary via an SIB from the network, for example, a gNB of the old serving cell or a gNB of the new serving cell. If the received information indicates that confirmation of the condition is necessary, UE 1 may transition MR 11 to the ultra-deep sleep power state in response to determining that the condition is satisfied.

[0129] Additionally or alternatively, a condition (or determination criterion) under which the UE 1 may transition the MR 11 to the ultra deep sleep power state after cell reselection without an explicit instruction from a gNB (e.g., gNB 2B) managing a new serving cell may be that the new serving cell belongs to (or is included in) a predetermined area. The gNB (e.g., gNB 2A) may transmit information regarding an area (e.g., LP-WUS area, ultra deep sleep area) consisting of cells that support LP-WUS or transmit LP-WUS (or LP-SS) to the UE 1 in a UE-dedicated RRC message (e.g., RRC Release). The information regarding the area may be specified as new information (e.g., Information Element (IE) or field) included in information regarding the RAN Notification Area (RNA), which is an area in which mobility (e.g., cell reselection) is permitted while the UE 1 remains in the RRC_INACTIVE state. If the new serving cell belongs to the area, the UE 1 may transition the MR 11 to the ultra deep sleep power state after cell reselection. Note that the UE 1 may use this in combination with other conditions to transition the MR 11 into the ultra-deep sleep power state.

[0130] According to the operation described with reference to Figure 12, after UE 1 moves to a new serving cell, if the new serving cell supports or transmits LP-WUS, UE 1 can transition MR 11 to an ultra-deep sleep power state, which helps clarify the details of the cell reselection operation of UE 1 using LP-WUS and LP-WUR.

[0131] Seventh Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0132] Figure 13 shows an example of signaling related to LP-WUS and LP-WUR. In step 1301, gNB 2 transmits information to UE 1 in cell 21 indicating that the serving cell (i.e., cell 21) and / or neighboring cells have LP-WUS partial coverage.

[0133] In one example, the gNB 2 may transmit the information to the UE 1 via a dedicated RRC message or via common system information (e.g., MIB or any SIB) within the cell 21. The dedicated RRC message may be an RRC Release message for releasing or suspending the RRC connection of the UE 1. The dedicated RRC message may be an RRC Reconfiguration message. The system information may be broadcast periodically within the cell 21 or on-demand (i.e., upon request from UE(s) that are RRC_IDLE or RRC_INACTIVE). The UE 1 may receive the information using the MR 11 before transitioning the MR 11 to the ultra-deep sleep power state. Alternatively, the UE 1 may temporarily wake up the MR 11 from the ultra-deep sleep power state and receive the information using the MR 11.

[0134] In another example, gNB 2 may transmit the information of step 1301 using the LP-WUS or LP-SS. gNB 2 may use the LP-WUS or LP-SS of cell 21 to indicate to UE 1 whether the LP-WUS or LP-SS has partial coverage. UE 1 may receive the information using LR 12 while MR 11 is in the ultra-deep sleep power state.

[0135] According to the operation described with reference to Figure 13, gNB 2 can inform UE 1 that the cell 21 served by gNB 2, or a neighboring cell, or both, have LP-WUS partial coverage. This can assist RRM measurements and cell reselection by UE 1 that supports low power consumption mechanisms using LP-WUS and LP-WUR. This also contributes to clarifying signaling details regarding low power consumption mechanisms using LP-WUS and LP-WUR.

[0136] UE 1 may determine whether to use SSB measurements or LP-WUS / LP-SS measurements for cell reselection based on the information in step 1301. Figure 14 shows an example of the operation of UE 1. Step 1401 corresponds to step 1301 in Figure 13. UE 1 receives information from gNB 2 in cell 21 indicating that the serving cell (i.e., cell 21) and / or neighboring cells have LP-WUS partial coverage.

[0137] In step 1402, UE 1 determines whether to use SSB measurements or LP-WUS / LP-SS measurements for cell reselection based on the received information. The operation of Figure 14 or the determination of step 1402 may be performed if the quality of the LP-WUS or LP-SS of the serving cell is below a threshold.

[0138] The determination in step 1402 may be performed as follows: If the information in step 1401 indicates that the serving cell (i.e., cell 21) has LP-WUS partial coverage, UE 1 may decide to perform cell reselection using SSB measurements. Similarly, if the information in step 1401 indicates that the neighboring cell has LP-WUS partial coverage, UE 1 may decide to perform cell reselection using SSB measurements.

[0139] On the other hand, if UE 1 determines that neither the serving cell nor the neighboring cell has LP-WUS partial coverage, in other words, that both the serving cell and the neighboring cell have LP-WUS full coverage, UE 1 may perform cell reselection using LP-WUS / LP-SS measurements. If UE 1 determines that the serving cell does not have LP-WUS partial coverage, in other words, that the serving cell has LP-WUS full coverage, UE 1 may attempt to receive the LP-WUS / LP-SS of the neighboring cell. If UE 1 can receive the LP-WUS / LP-SS of the neighboring cell, UE 1 may perform cell reselection using LP-WUS / LP-SS measurements, otherwise it may fall back to cell reselection using SSB measurements.

[0140] According to the operation described with reference to Figure 14, UE 1 receives information from gNB 2 indicating that one or both of the serving cell and neighboring cells are in LP-WUS partial coverage, and can determine how to perform cell reselection operation based on the information. This helps clarify the details of cell reselection operation of UE 1 using LP-WUS and LP-WUR.

[0141] Figure 15 shows an example of signaling between gNBs. In step 1501, gNB 2A sends information to neighboring gNB 2B indicating whether one or more cells provided by gNB 2A have LP-WUS partial coverage. The information may indicate LP-WUS partial coverage on a cell-by-cell or frequency-by-frequency basis.

[0142] In step 1502, gNB 2A receives from gNB 2B information indicating whether one or more cells provided by neighboring gNB 2B have LP-WUS partial coverage. The information may indicate LP-WUS partial coverage on a cell-by-cell or frequency-by-frequency basis. gNB 2A may use the information received from gNB 2B to generate information to be transmitted to UE 1 in step 1301 of Fig. 13. Additionally or alternatively, gNB 2A may use the information received from gNB 2B to generate configuration information related to RRM measurements and cell reselection to be provided to UE 1 in its cell 21A.

[0143] The order of steps 1501 and 1502 is not limited. The control message carrying information in each of steps 1501 and 1502 may be, for example, an XN SETUP REQUEST, an XN SETUP RESPONSE, an NG-RAN NODE CONFIGURATION UPDATE, or an NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE message.

[0144] According to the operation described with reference to Figure 15, gNB 2A can exchange or share information about LP-WUS partial coverage with neighboring gNB 2B, which contributes to clarifying the signaling details regarding the low power consumption mechanism using LP-WUS and LP-WUR.

[0145] The operation described with reference to FIG. 15 enables the exchange or sharing of information indicating whether LP-WUS partial coverage exists between different gNBs. A gNB 2 may be composed of a CU (e.g., gNB-CU) and one or more DUs (e.g., gNB-DUs). In this case, the CU and DU may operate as follows. FIG. 16 shows an example of signaling between a CU and a DU. In step 1621, the DU 1601 transmits information indicating whether LP-WUS partial coverage exists in the cell served by the DU 1601 to the CU 1602 via a message (e.g., F1 SETUP REQUEST, GNB-DU CONFIGURATION UPDATE) on the CU-DU interface (e.g., F1 interface). The CU 1602 may request the DU 1601 to transmit information regarding LP-WUS partial coverage via an F1 message (e.g., RESOURCE STATUS REQUEST). The DU 1601 may transmit the information to the CU 1602 in an F1 message in response to a request from the CU 1602.

[0146] Eighth Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0147] FIG. 17 shows an example of the operation of UE 1. In step 1701, UE 1 acquires the reception quality of SSB (e.g., signal strength, SS-RSRP, SS-RSRQ) and the reception quality of LP-WUS or LP-SS (e.g., signal strength, received power) in a serving cell (e.g., cell 21). UE 1 may measure the reception quality of SSB using MR 11 or LR 12. UE 1 may measure the reception quality of SSB using LR 12. UE 1 may perform these measurements using LR 12, or using MR 11 and LR 12, before transitioning MR 11 to the ultra-deep sleep power state. UE 1 may perform these measurements using LR 12 while MR 11 is in the ultra-deep sleep power state. Alternatively, UE 1 may measure the reception quality of LP-WUS / LP-SS using LR 12 and measure the reception quality of SSB using MR 11 by temporarily waking up MR 11 from the ultra-deep sleep power state.

[0148] In step 1702, UE 1 determines whether to use SSB measurements or LP-WUS / LP-SS measurements for cell reselection based on the difference between the SSB reception quality and the LP-WUS / LP-SS reception quality. To perform this comparison, UE 1 may convert or map the LP-WUS or LP-SS measurements to the scale of the SSB measurements. Such conversion or mapping may be either a predefined offset 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 via system information (e.g., SIB) common to multiple UEs. The operation of FIG. 17 or the determination of step 1702 may be performed if the LP-WUS or LP-SS quality of the serving cell is below a threshold.

[0149] The determination in step 1702 may be performed as follows: If the quality difference between SSB and LP-WUS / LP-SS exceeds a predetermined threshold or offset value, UE 1 may decide to perform cell reselection using SSB measurements. Conversely, if the quality difference between SSB and LP-WUS / LP-SS is below a threshold or offset value, UE 1 may decide to perform cell reselection using LP-WUS / LP-SS measurements.

[0150] The determination in step 1702 may be modified as follows: UE 1 compares the reception quality of SSB and the reception quality of LP-WUS / LP-SS with their respective individual thresholds. If the reception quality of LP-WUS / LP-SS exceeds the threshold, UE 1 may decide to perform cell reselection using LP-WUS / LP-SS measurements. If the reception quality of LP-WUS / LP-SS falls below the threshold and the reception quality of SSB exceeds the threshold, UE 1 may decide to perform cell reselection using SSB measurements. If the reception quality of LP-WUS / LP-SS falls below the threshold and the reception quality of SSB also falls below the threshold, UE 1 may decide to perform cell reselection using either or both of LP-WUS / LP-SS measurements and SSB measurements.

[0151] UE 1 may determine whether to use LP-WUS / LP-SS or SSB for cell reselection based on the LP-WUS / LP-SS measurement values ​​and SSB measurement values ​​of the serving cell according to the procedure of Figure 17, and may perform intra-frequency cell reselection of the serving cell based on the quality of the determined one (e.g., LP-WUS / SS). Additionally, UE 1 may perform inter-frequency cell reselection based on the quality of the determined one (e.g., LP-WUS / SS) for the serving cell.

[0152] The procedure of FIG. 17 may be modified as follows. When determining whether to use LP-WUS / LP-SS or SSB for cell reselection, UE 1 may further consider the signal quality of neighboring cells that share the same frequency as the serving cell. In this case, UE 1 may use the average or minimum value of measurements of multiple cells within the serving cell frequency for the determination in step 1702. UE 1 may perform intra-frequency cell reselection based on the quality of one of the neighboring cells (e.g., LP-WUS / SS) determined based on the quality of the serving cell frequency. In addition, UE 1 may perform inter-frequency cell reselection based on the quality of one of the neighboring cells (e.g., LP-WUS / SS) determined for the serving cell frequency.

[0153] Alternatively, when determining whether to use LP-WUS / LP-SS or SSB for cell reselection, UE 1 may consider the signal quality of neighboring cells within the serving cell frequency and also the signal quality of cells on frequencies other than the serving cell frequency. In this case, UE 1 may use the average or minimum value of the measurement values ​​for each frequency in the determination of step 1702. UE 1 may perform intra-frequency cell reselection based on the quality of one of the frequencies (e.g., LP-WUS / SS) determined based on the quality of the serving cell frequency. UE 1 may also perform inter-frequency cell reselection based on the measurement value of one of the frequencies (LP-WUS / SS or SSB) determined for each frequency.

[0154] According to the operation described with reference to Figure 17, UE 1 can determine how to perform cell reselection operation using at least the SSB reception quality and LP-WUS / LP-SS reception quality of the serving cell, which contributes to clarifying the details of the cell reselection operation of UE 1 using LP-WUS and LP-WUR.

[0155] Ninth Embodiment This embodiment relates to RRM measurement and cell reselection in the RRC_IDLE and INACTIVE states. A configuration example of a wireless communication system according to this embodiment is the same as the configuration example described with reference to FIGS.

[0156] FIG. 18 shows an example of the operation of UE 1. In step 1801, UE 1 attempts cell reselection based on LP-WUS or LP-SS measurements using LR 12 while MR 11 is in the ultra-deep sleep power state. UE 1 searches for a suitable cell based on LP-WUS or LP-SS measurements. A suitable cell may be a cell determined to satisfy cell selection criteria (e.g., cell selection criterion S) based on LP-WUS or LP-SS reception quality (e.g., signal strength, received power). Alternatively, a suitable cell may be a cell that satisfies cell selection criteria based on LP-WUS or LP-SS reception quality (e.g., signal strength, received power) and whose LP-WUS or LP-SS reception quality exceeds a predetermined threshold. To reuse existing cell selection criteria based on SSB measurements (e.g., cell selection criterion S), UE 1 may convert or map LP-WUS or LP-SS measurements from LR 12 to the scale of SSB measurements. Such conversion or mapping may be either a predefined offset in a 3GPP specification or a semi-static parameter that can be periodically calibrated based on 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 via system information (e.g., SIB) common to multiple UEs.

[0157] In step 1802, if a suitable cell is not found based on the LP-WUS or LP-SS measurements, UE 1 initiates cell reselection based on SSB measurements. The evaluation process and cell reselection criteria for cell reselection based on SSB measurements may be similar to those of existing methods. UE 1 may measure the SSB reception quality (e.g., SS-RSRP, SS-RSRQ) using MR 11 by waking up MR 11 from the ultra-deep sleep power state. Alternatively, UE 1 may perform SSB measurements using LR 12 while MR 11 is in the ultra-deep sleep power state. The operation of FIG. 18 or the operation of step 1802 may be performed if the quality of the LP-WUS or LP-SS of the serving cell is below a threshold.

[0158] According to the operation described with reference to Figure 18, UE 1 can preferentially select a cell supporting LP-WUS / LP-SS in cell reselection, which contributes to clarifying the details of the cell reselection operation of UE 1 using LP-WUS and LP-WUR.

[0159] <Other Embodiments> In the above-described embodiments, 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 embodiments, 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 embodiments, 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).

[0160] 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. 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 such RRM measurements in an appropriate combination with the operations described in the above-described embodiment. 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).

[0161] Next, exemplary configurations of the UE 1 and the gNB 2 related to the above-described embodiments will be described below. FIG. 19 is a block diagram showing an exemplary configuration of the UE 1. A main Radio Frequency (RF) transceiver 1901 corresponds to the RF unit included in the above-described MR 11. The main RF transceiver 1901 performs analog RF signal processing for communication with RAN nodes including the gNB 2. The main RF transceiver 1901 may include multiple transceivers. The analog RF signal processing performed by the main RF transceiver 1901 includes frequency up-conversion, frequency down-conversion, and amplification. The main RF transceiver 1901 is coupled to an antenna array 1902 and a baseband processor 1903. The main RF transceiver 1901 receives modulation symbol data (or orthogonal frequency-division multiplexing (OFDM) symbol data) from the baseband processor 1903, generates a transmit RF signal, and provides the transmit RF signal to the antenna array 1902. The main RF transceiver 1901 also generates a baseband receive signal based on the receive RF signal received by the antenna array 1902 and supplies the baseband receive signal to the baseband processor 1903. The main RF transceiver 1901 may include an analog beamformer circuit for beamforming. The analog beamformer circuit includes, for example, multiple phase shifters and multiple power amplifiers.

[0162] The baseband processor 1903 corresponds to the digital baseband unit of the MR 11. The baseband processor 1903 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).

[0163] For example, the digital baseband signal processing by the baseband processor 1903 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 1903 may include processing of a Non-Access Stratum (NAS) protocol, an RRC protocol, MAC Control Elements (CEs), and DCIs.

[0164] The baseband processor 1903 may perform Multiple Input Multiple Output (MIMO) encoding and precoding for beamforming.

[0165] The baseband processor 1903 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 1904, which will be described later.

[0166] The application processor 1904 is also referred to as a CPU, MPU, microprocessor, or processor core. The application processor 1904 may include multiple processors (multiple processor cores). The application processor 1904 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 1906 or a memory not shown, thereby realizing various functions of the UE 1.

[0167] In some implementations, the baseband processor 1903 and the application processor 1904 may be integrated on a single chip, as shown by the dashed line (1905) in Figure 19. In other words, the baseband processor 1903 and the application processor 1904 may be implemented as a single System on Chip (SoC) device 1905. An SoC device may also be called a system Large Scale Integration (LSI) or chipset.

[0168] The memory 1906 is volatile memory, nonvolatile memory, or a combination thereof. The memory 1906 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 1906 may include an external memory device accessible from the baseband processor 1903, the application processor 1904, and the SoC 1905. The memory 1906 may also include an internal memory device integrated within the baseband processor 1903, the application processor 1904, or the SoC 1905. Furthermore, the memory 1906 may include memory within a Universal Integrated Circuit Card (UICC).

[0169] The memory 1906 may store one or more software modules (computer programs) 1907 including instructions and data for performing the processes described in the above embodiments by the UE 1. In some implementations, the baseband processor 1903 or the application processor 1904 may be configured to read and execute the software modules 1907 from the memory 1906 to perform the processes of the UE 1 described in the above embodiments using the drawings.

[0170] 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 1903, the application processor 1904, or both.

[0171] 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 1901, the antenna array 1902, and the LP-WUS receiver 1710, namely, at least one of the baseband processor 1903 and the application processor 1904, and the memory 1906 storing the software module 1907.

[0172] FIG. 20 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 2001, a network interface 2003, a processor 2004, and a memory 2005. The main RF transceiver 2001 performs analog RF signal processing for communicating with UEs, including UE 1. The RF transceiver 2001 may include multiple transceivers. The RF transceiver 2001 is coupled to an antenna array 2002 and a processor 2004. The RF transceiver 2001 receives modulation symbol data from the processor 2004, generates a transmit RF signal, and provides the transmit RF signal to the antenna array 2002. The RF transceiver 2001 also generates a baseband receive signal based on the receive RF signal received by the antenna array 2002 and provides the baseband receive signal to the processor 2004. The RF transceiver 2001 may include an analog beamformer circuit for beamforming. The analog beamformer circuitry includes, for example, multiple phase shifters and multiple power amplifiers.

[0173] The network interface 2003 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.

[0174] The processor 2004 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. The processor 2004 may include multiple processors. For example, the processor 2004 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.

[0175] For example, digital baseband signal processing by the processor 2004 may include signal processing for SDAP, PDCP, Radio RLC, MAC, and PHY layers, and control plane processing by the processor 2004 may include processing of NAS messages, RRC messages, MAC CEs, and DCIs.

[0176] The processor 2004 may include a digital beamformer module for beamforming, which may include a MIMO encoder and a precoder.

[0177] The memory 2005 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 2005 may include storage located remotely from the processor 2004. In this case, the processor 2004 may access the memory 2005 via the network interface 2003 or an I / O interface (not shown).

[0178] The memory 2005 may store one or more software modules (computer programs) 2006 including instructions and data for performing the processing by the gNB 2 described in the above-described embodiments. In some implementations, the processor 2004 may be configured to read and execute the software modules 2006 from the memory 2005 to perform the processing by the gNB 2 described in the above-described embodiments.

[0179] 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 2004.

[0180] If gNB 2 is a CU (e.g., eNB-CU or gNB-CU) or CU-CP, gNB 2 may not include RF transceiver 2001 (and antenna array 2002) and LP-WUS transmitter 1810.

[0181] As described with reference to Figures 19 and 20, 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.

[0182] 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.

[0183] 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 2-13, which are dependent on appendices 1, may also be described as appendices dependent on appendices 31 and 33, due to the same dependency relationship as appendices 2-13. Similarly, some or all of the elements described in appendices 15-30, which are dependent on appendices 14, may also be described as appendices dependent on appendices 32 and 34, due to the same dependency relationship as appendices 15-30. 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.

[0184] (Supplementary Note 1) A Radio Access Network (RAN) node comprising: means for notifying a neighboring RAN node of support for or a transmission status of a low power consumption wake-up related signal in a first cell of the RAN node, and for receiving from the neighboring RAN node the support for or transmission status of the low power consumption wake-up related signal in a second cell of the neighboring RAN node. (Supplementary Note 2) The RAN node of Supplementary Note 1, further comprising means for transmitting to a radio terminal in the first cell information indicating the support for or transmission status of the low power consumption wake-up related signal in the second cell of the neighboring RAN node. (Supplementary Note 3) The RAN node of Supplementary Note 2, wherein the means for transmitting to the radio terminal is adapted to transmit the information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via system information common within the first cell. (Supplementary Note 4) The RAN node according to any one of Supplementary Notes 1 to 3, wherein the low power wakeup related signals are received by a low power wakeup receiver of a wireless terminal comprising a primary transceiver and the low power wakeup receiver, the primary transceiver being 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 not being used for receiving the low power wakeup related signals, and the low power wakeup receiver being used to receive the low power wakeup related signals at least while the primary transceiver is in an ultra-deep sleep power state.(Supplementary Note 5) The RAN node of Supplementary Note 4, wherein the low power wakeup related signal includes: a low power wakeup signal that triggers a wakeup of the primary transceiver in the radio terminal that receives the low power wakeup related signal at the low power wakeup receiver, and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 6) The RAN node of Supplementary Note 4 or 5, further comprising: means for informing the radio terminal whether measurements of the low power wakeup related signal for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state need to be made within a first frequency of the first cell, or need to be made on both the first frequency and a second frequency different from the first frequency. (Supplementary Note 7) The RAN node of Supplementary Note 6, wherein the means for informing the radio terminal is adapted to indicate the second frequency to the radio terminal. (Supplementary Note 8) The RAN node according to Supplementary Note 4 or 5, wherein the low power wakeup receiver is configured to receive at least a portion of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprising: means for notifying the radio terminal whether measurement of the SSB by the low power wakeup receiver is required while the primary transceiver is in the ultra-deep sleep power state. (Supplementary Note 9) The RAN node according to any one of Supplements 1 to 8, further comprising: means for transmitting to the radio terminal information indicating a coverage mismatch, where coverage of the low power wakeup related signal transmitted in the first cell is smaller than coverage of the Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.(Supplementary Note 10) The RAN node according to Supplementary Note 9, wherein the information indicating the coverage mismatch in the first cell causes the radio terminal to decide whether to use the measurement of the SSB or the measurement of the low power wake-up related signal for cell reselection. (Supplementary Note 11) The RAN node according to any one of Supplements 1 to 10, further comprising: means for transmitting, to the radio terminal, information indicating a coverage mismatch, where the coverage of the low power wake-up related signal transmitted in the second cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the second cell. (Supplementary Note 12) The RAN node according to Supplementary Note 11, wherein the information indicating the coverage mismatch in the second cell causes the radio terminal to decide whether to use the measurement of the SSB or the measurement of the low power wake-up related signal for cell reselection. (Supplementary Note 13) The RAN node according to any one of Supplements 1 to 12, further comprising: means for transmitting, to the neighboring RAN node, information indicating a coverage mismatch in which the coverage of the low power wake-up related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 14) A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for receiving, in a first cell, from a network, information indicating support or transmission status of a low power wake-up related signal in a second cell. (Supplementary Note 15) The wireless terminal according to Supplementary Note 14, wherein the receiving means is adapted to receive the information using the primary transceiver. (Supplementary Note 16) The radio terminal according to Supplementary Note 14 or 15, wherein the receiving means is adapted to receive the information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via system information common within the first cell.(Supplementary Note 17) The wireless terminal according to any one of Supplementary Notes 14 to 16, wherein the low power consumption wakeup-related signals are received by the low power consumption wakeup receiver, 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 wakeup-related signals, and the low power consumption wakeup receiver is used to receive the low power consumption wakeup-related signals at least while the primary transceiver is in an ultra-deep sleep power state. (Supplementary Note 18) The wireless terminal of Supplementary Note 17, wherein the low power wakeup related signal includes: a low power wakeup signal that triggers a wakeup of the primary transceiver in the wireless terminal that receives the low power wakeup related signal at the low power wakeup receiver, and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 19) The wireless terminal of Supplementary Note 17 or 18, further comprising means for receiving from the network in the first cell whether measurements of the low power wakeup related signal for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state need to be made within a first frequency of the first cell or need to be made on both the first frequency and a second frequency different from the first frequency.(Supplementary Note 20) The wireless terminal of Supplementary Note 17 or 18, wherein the low power wake-up receiver is configured to receive at least a portion of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprising means for receiving from the network whether measurement of the SSB by the low power wake-up receiver is required while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 21) The wireless terminal according to any one of Supplementary Notes 14 to 18, wherein the low power wakeup receiver is configured to receive at least a part of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprises: means for measuring an SSB of the first cell using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the first cell falls below a first threshold; and means for measuring an SSB of a neighboring cell using the same frequency as that of the first cell using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the first cell or a reception quality of the SSB falls below a second threshold. (Supplementary Note 22) The wireless terminal according to any one of Supplementary Notes 14 to 18, wherein the low power wakeup receiver is configured to receive at least a portion of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprises: means for measuring an SSB at a first frequency of the first cell using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the first cell falls below a first threshold; and means for measuring an SSB at a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the first cell or a reception quality of the SSB at the first frequency falls below a second threshold.(Supplementary Note 23) The wireless terminal according to any one of Supplements 14 to 18, further comprising: means for preferentially selecting neighboring cells that support or transmit the low power consumption wakeup related signaling in cell reselection compared to neighboring cells that do not support or transmit the low power consumption wakeup related signaling. (Supplementary Note 24) The wireless terminal according to any one of Supplements 14 to 18 and 23, further comprising: means for, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power consumption wakeup receiver, if the new serving cell supports or transmits the low power consumption wakeup related signaling. (Supplementary Note 25) The radio terminal according to any one of Supplementary Notes 14 to 24, further comprising: means for receiving from the network information indicating a coverage mismatch, where the coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 26) The radio terminal according to Supplementary Note 25, further comprising means for determining whether to use measurement of the SSB or measurement of the low power consumption wake-up related signal for cell reselection, based on the information indicating the coverage mismatch in the first cell. (Supplementary Note 27) The wireless terminal according to any one of Supplementary Notes 14 to 26, further comprising: means for receiving, in the first cell, information indicating a coverage mismatch between the coverage of the low power consumption wake-up related signal transmitted in the second cell and the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the second cell, from the network.(Supplementary Note 28) The radio terminal according to Supplementary Note 27, further comprising: means for determining whether to use measurement of the SSB or measurement of the low power consumption wake-up related signal for cell reselection, based on information indicating the coverage mismatch in the second cell. (Supplementary Note 29) The radio terminal according to any one of Supplements 14 to 24, further comprising means for determining whether to use measurement of the SSB or measurement of the low power consumption wake-up related signal for cell reselection, based on a difference between reception quality of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) in the first cell and reception quality of the low power consumption wake-up related signal. (Supplementary Note 30) The radio terminal of any one of Supplements 14 to 24, further comprising means for attempting cell reselection based on measurements of the low power wake-up related signal while the primary transceiver is in an ultra-deep sleep power state, and initiating cell reselection based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) if no suitable cell is found based on measurements of the low power wake-up related signal. (Supplementary Note 31) A method performed by a Radio Access Network (RAN) node, comprising: notifying a neighboring RAN node of support or transmission status of low power wake-up related signals in a first cell of the RAN node, and receiving from the neighboring RAN node support or transmission status of the low power wake-up related signals in a second cell of the neighboring RAN node. (Supplementary Note 32) A method performed by a radio terminal, comprising receiving from a network in a first cell information indicating support or transmission status of low power wake-up related signals in the second cell.(Supplementary Note 33) A program causing a computer to perform a method for a radio access network (RAN) node, the method comprising: notifying a neighboring RAN node of support for or transmission status of low power consumption wake-up related signals in a first cell of the RAN node, and receiving from the neighboring RAN node the support for or transmission status of the low power consumption wake-up related signals in a second cell of the neighboring RAN node. (Supplementary Note 34) A program causing a computer to perform a method for a radio terminal, the method comprising receiving from a network in a first cell information indicating support for or transmission status of low power consumption wake-up related signals in a second cell. (Supplementary Note 35) A radio access network (RAN) node, comprising means for transmitting, to a radio terminal in a first cell of the RAN node, information indicating support for or transmission status of low power consumption wake-up related signals in a second cell of an neighboring RAN node. 36. The RAN node of claim 35, wherein the means for transmitting to the radio terminal is adapted to transmit the information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via system information common within the first cell.(Supplementary Note 37) The RAN node of Supplementary Note 35 or 36, wherein the low power wakeup related signals are received by the low power wakeup receiver of the wireless terminal comprising a primary transceiver and a low power wakeup receiver, the primary transceiver being 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 not being used for receiving the low power wakeup related signals, and the low power wakeup receiver being used to receive the low power wakeup related signals at least while the primary transceiver is in an ultra-deep sleep power state. (Supplementary Note 38) The RAN node of Supplementary Note 37, wherein the low power wakeup related signal comprises: a low power wakeup signal that triggers a wakeup of the primary transceiver in the radio terminal that receives the low power wakeup related signal at the low power wakeup receiver, and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 39) A method performed by a Radio Access Network (RAN) node, comprising transmitting, to a radio terminal in a first cell of the RAN node, information indicating support or transmission status of low power wakeup related signals in a second cell of an adjacent RAN node. (Supplementary Note 40) A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising transmitting, to a radio terminal in a first cell of the RAN node, information indicating support or transmission status of low power wakeup related signals in a second cell of an adjacent RAN node.(Supplementary Note 41) A Radio Access Network (RAN) node comprising: means for transmitting, in a first cell, information related to a low power wake-up related signal to a radio terminal, the information indicating whether measurements of the low power wake-up related signal for radio resource management measurements while a primary transceiver of the radio terminal is in an ultra deep sleep power state should be made within a first frequency of the first cell or should be made on both the first frequency and a second frequency different from the first frequency. (Supplementary Note 42) The RAN node of Supplementary Note 41, wherein the information specifies the second frequency to the radio terminal. (Supplementary Note 43) The RAN node of Supplementary Note 41 or 42, wherein the transmitting means is adapted to transmit the information to the radio terminal via a dedicated Radio Resource Control (RRC) message or via system information common within the first cell. (Supplementary Note 44) The RAN node of any one of Supplementary Notes 41 to 43, wherein the low power wake-up related signals include low power synchronization or reference signals monitored for the radio resource management measurements while the primary transceiver is in the ultra deep sleep power state.(Supplementary Note 45) The RAN node according to any one of Supplementary Notes 41 to 44, wherein the low power wakeup related signals are received by the low power wakeup receiver of the wireless terminal comprising the primary transceiver and the low power wakeup receiver, the primary transceiver being 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 not being used for receiving the low power wakeup related signals, and the low power wakeup receiver being used to receive the low power wakeup related signals at least while the primary transceiver is in the ultra-deep sleep power state. 46. ​​A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for receiving information about low power wakeup related signals from a network in a first cell, the information indicating whether measurements of the low power wakeup related signals for radio resource management measurements while the primary transceiver is in an ultra deep sleep power state need to be made within a first frequency of the first cell, or both the first frequency and a second frequency different from the first frequency. (Supplementary Note 47) A method performed by a Radio Access Network (RAN) node, comprising: transmitting information about low power wakeup related signals to a wireless terminal in a first cell, the information indicating whether measurements of the low power wakeup related signals for radio resource management measurements while the primary transceiver of the wireless terminal is in an ultra deep sleep power state need to be made within the first frequency of the first cell, or both the first frequency and a second frequency different from the first frequency.(Supplementary Note 48) A method performed by a wireless terminal, comprising receiving information about low power consumption wake-up related signals from a network in a first cell, the information indicating whether measurements of the low power consumption wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra deep sleep power state need to be made within a first frequency of the first cell, or both the first frequency and a second frequency different from the first frequency. (Supplementary Note 49) A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising transmitting information about low power consumption wake-up related signals to a wireless terminal in a first cell, the information indicating whether measurements of the low power consumption wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra deep sleep power state need to be made within the first frequency of the first cell, or both the first frequency and a second frequency different from the first frequency. (Supplementary Note 50) A program for causing a computer to perform a method for a wireless terminal, the method comprising receiving information regarding a low power consumption wake-up related signal from a network in a first cell, the information indicating whether measurements of the low power consumption wake-up related signal for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra-deep sleep power state need to be performed within a first frequency of the first cell, or whether measurements of the low power consumption wake-up related signal need to be performed both on the first frequency and on a second frequency different from the first frequency.51. A Radio Access Network (RAN) node comprising: means for transmitting, in a first cell, information relating to low power wake-up related signals to a wireless terminal, the information indicating whether measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra-deep sleep power state. 52. The RAN node of claim 51, wherein the transmitting means is adapted to transmit the information to the wireless terminal via a dedicated Radio Resource Control (RRC) message or via system information common within the first cell. (Supplementary Note 53) The RAN node of Supplementary Note 51 or 52, wherein the low power wakeup related signals include one or both of: a low power wakeup signal that triggers a wakeup of the primary transceiver in the radio terminal that receives the low power wakeup related signal at the low power wakeup receiver; and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state.(Supplementary Note 54) The RAN node of any one of Supplementary Notes 51 to 53, wherein the low power wakeup related signals are received by the low power wakeup receiver of the wireless terminal, 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 55) A wireless terminal comprising: a primary transceiver; a low power consumption wake-up receiver; and means for receiving information relating to a low power consumption wake-up related signal from a network in a first cell, the information indicating whether measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) by the low power consumption wake-up receiver is required while the primary transceiver is in an ultra-deep sleep power state.(Supplementary Note 56) The wireless terminal of Supplementary Note 55, wherein the low power wake-up related signals are received by the low power wake-up receiver, 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, 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, and the low power wake-up receiver is configured to receive at least a portion of SSBs. (Supplementary Note 57) A method performed by a Radio Access Network (RAN) node, comprising: transmitting, in a first cell, information regarding low power wake-up related signals to a wireless terminal, the information indicating whether or not measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state. (Supplementary Note 58) A method performed by a wireless terminal, comprising: receiving, in a first cell, information regarding low power wake-up related signals from a network, the information indicating whether measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state.(Supplementary Note 59) A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising: transmitting, in a first cell, information regarding a low power wake-up related signal to a wireless terminal, the information indicating whether measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) is required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state. (Supplementary Note 60) A program for causing a computer to perform a method for a wireless terminal, the method comprising: receiving, in a first cell, information regarding a low power wake-up related signal from a network, the information indicating whether measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) is required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state.(Supplementary Note 61) A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for performing cell reselection using the low power wakeup receiver, wherein the means for performing cell reselection is adapted to: measure a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup-related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measure an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the serving cell or a reception quality of the SSB falls below a second threshold while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 62) The wireless terminal of Supplementary Note 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 low power wake-up related signals; 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; and the low power wake-up receiver is configured to receive at least a portion of SSBs.(Supplementary Note 63) A method performed by a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising performing cell reselection using the low power wakeup receiver, wherein performing the cell reselection includes: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB falls below a second threshold while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 64) A program for causing a computer to execute a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, the method comprising performing cell reselection using the low power wakeup receiver, the performing cell reselection including: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup-related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the serving cell or a reception quality of the SSB falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.(Supplementary Note 65) A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for performing cell reselection using the low power wakeup receiver, wherein the means for performing cell reselection is adapted to: measure a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) at a first frequency of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup-related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measure an SSB at a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the serving cell or a reception quality of the SSB at the first frequency falls below a second threshold while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 66) The wireless terminal of Supplementary Note 65, 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; 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; and the low power wake-up receiver is configured to receive at least a portion of SSBs.(Supplementary Note 67) A method performed by a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising performing cell reselection using the low power wakeup receiver, wherein performing the cell reselection includes: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) at a first frequency of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB at a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB at the first frequency falls below a second threshold while the primary transceiver is in the ultra deep sleep power state. (Supplementary Note 68) A program for causing a computer to execute a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, the method comprising performing cell reselection using the low power wakeup receiver, the performing cell reselection including: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) at a first frequency of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup-related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB at a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup-related signal of the serving cell or a reception quality of the SSB at the first frequency falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.(Supplementary Note 69) A wireless terminal comprising: a primary transceiver; a low power consumption wakeup receiver; and means for preferentially selecting neighboring cells that support or transmit low power consumption wakeup related signals in cell reselection, compared to neighboring cells that do not support or transmit the low power consumption wakeup related signals. (Supplementary Note 70) The wireless terminal according to Supplementary Note 69, further comprising means for, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra deep sleep power state and switching to reception by the low power consumption wakeup receiver, if the new serving cell supports or transmits the low power consumption wakeup related signals. (Supplementary Note 71) The wireless terminal of Supplementary Note 70, wherein the cell reselection includes: triggering a wake-up of the primary transceiver based on measurements of the low power wake-up related signals using the low power wake-up receiver while the primary transceiver is in the ultra-deep sleep power state; and determining the new serving cell based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or a Channel State Information Reference Signal (CSI-RS) using the primary transceiver.(Supplementary Note 72) The wireless terminal according to any one of Supplementary Notes 69 to 71, wherein the low power consumption wakeup related signals are received by the low power consumption wakeup receiver, 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 wakeup related signals, and the low power consumption wakeup receiver is used to receive the low power consumption wakeup related signals at least while the primary transceiver is in an ultra-deep sleep power state. (Supplementary Note 73) A method performed by a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising preferentially selecting, in cell reselection, neighboring cells that support or transmit low power wakeup related signals over neighboring cells that do not support or transmit the low power wakeup related signals. (Supplementary Note 74) A program for causing a computer to perform a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, the method comprising preferentially selecting, in cell reselection, neighboring cells that support or transmit low power wakeup related signals over neighboring cells that do not support or transmit the low power wakeup related signals. (Supplementary Note 75) A wireless terminal comprising: a primary transceiver; a low power consumption wake-up receiver; and means for, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power consumption wake-up receiver if the new serving cell supports or transmits low power consumption wake-up related signals.(Supplementary Note 76) The wireless terminal of Supplementary Note 75, wherein the cell reselection includes: triggering a wake-up of the primary transceiver based on measurements of the low power wake-up related signals using the low power wake-up receiver while the primary transceiver is in the ultra-deep sleep power state; and determining the new serving cell based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or a Channel State Information Reference Signal (CSI-RS) using the primary transceiver. (Supplementary Note 77) The wireless terminal of Supplementary Note 75 or 76, wherein the low power consumption wakeup related signals are received by the low power consumption wakeup receiver, 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 wakeup related signals, and the low power consumption wakeup receiver is used to receive the low power consumption wakeup related signals at least while the primary transceiver is in the ultra-deep sleep power state. (Supplementary Note 78) A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power wake-up receiver if the new serving cell supports or transmits low power wake-up related signals.7. A radio access network (RAN) node comprising: means for transmitting, to a radio terminal in a first cell, first information regarding a low power consumption wake-up related signal, the first information indicating a coverage mismatch where coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 81) The RAN node according to Supplementary Note 80, wherein the first information causes the radio terminal to decide whether to use measurements of the SSB or the low power wake-up related signal for cell reselection. (Supplementary Note 82) The RAN node according to Supplementary Note 80 or 81, further comprising: means for transmitting second information to the radio terminal, the second information indicating a coverage mismatch, where coverage of a low power wake-up related signal transmitted in a second cell adjacent to the first cell is smaller than coverage of an SSB transmitted in the second cell. (Supplementary Note 83) The RAN node according to Supplementary Note 82, wherein the second information causes the radio terminal to decide whether to use measurements of the SSB or the low power wake-up related signal for cell reselection.(Supplementary Note 84) The RAN node according to any one of Supplements 80 to 83, further comprising means for transmitting third information to a neighboring RAN node associated with a second cell neighboring the first cell, the third information indicating a coverage mismatch where coverage of the low power wake-up related signal transmitted in the first cell is smaller than coverage of the SSB transmitted in the first cell. (Supplementary Note 85) The RAN node according to any one of Supplements 80 to 84, wherein the means for transmitting the first information is adapted to transmit the first information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via system information common within the first cell. (Supplementary Note 86) The RAN node according to any one of Supplements 80 to 84, wherein the means for transmitting first information is adapted to transmit the first information via the low power wake-up related signal of the first cell. (Supplementary Note 87) The RAN node of any one of Supplementary Notes 80 to 86, wherein the low power wakeup related signals are received by the low power wakeup receiver of the wireless terminal comprising a primary transceiver and a low power wakeup receiver, the primary transceiver being 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 not being used for receiving the low power wakeup related signals, and the low power wakeup receiver being used to receive the low power wakeup related signals at least while the primary transceiver is in an ultra-deep sleep power state.(Supplementary Note 88) A wireless terminal comprising: a primary transceiver; a low power consumption wakeup receiver; and means for receiving first information relating to a low power consumption wakeup-related signal from a network in a first cell, wherein the first information indicates a coverage mismatch where the coverage of the low power consumption wakeup-related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 89) The wireless terminal according to Supplementary Note 88, further comprising means for determining whether to use measurements of the SSB or the low power consumption wakeup-related signal for cell reselection based on the first information. (Supplementary Note 90) The radio terminal according to any one of Supplementary Notes 88 or 89, further comprising: means for receiving, in the first cell from the network, second information indicating a coverage mismatch, where coverage of a low power consumption wake-up related signal transmitted in a second cell adjacent to the first cell is smaller than coverage of an SSB transmitted in the second cell. (Supplementary Note 91) The radio terminal according to Supplementary Note 90, further comprising: means for determining whether to use measurements of the SSB or the low power consumption wake-up related signal for cell reselection based on the second information. (Supplementary Note 92) The radio terminal according to any one of Supplements 88 to 91, wherein the means for receiving the first information is adapted to receive the first information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via system information common within the first cell. (Supplementary Note 93) The wireless terminal according to any one of Supplementary Notes 88 to 91, wherein the means for receiving the first information is adapted to receive the first information via the low power consumption wake-up related signaling of the first cell.(Supplementary Note 94) The wireless terminal according to any one of Supplementary Notes 88 to 93, wherein the low power consumption wake-up related signals are received by the low power consumption wake-up receiver, 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 an ultra-deep sleep power state. (Supplementary Note 95) A method performed by a Radio Access Network (RAN) node, comprising: transmitting information on a low power consumption wake-up related signal to a wireless terminal in a first cell, the information indicating a coverage mismatch between the coverage of the low power consumption wake-up related signal transmitted in the first cell and the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 96) A method performed by a wireless terminal, comprising: receiving first information on a low power consumption wake-up related signal from a network in a first cell, the first information indicating a coverage mismatch between the coverage of the low power consumption wake-up related signal transmitted in the first cell and the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.(Supplementary Note 97) A program causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising: transmitting, in a first cell, first information regarding a low power consumption wake-up related signal to a wireless terminal, the first information indicating a coverage mismatch between the coverage of the low power consumption wake-up related signal transmitted in the first cell and the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 98) A program causing a computer to perform a method for a wireless terminal, the method comprising: receiving, in a first cell, first information regarding a low power consumption wake-up related signal from a network, the first information indicating a coverage mismatch between the coverage of the low power consumption wake-up related signal transmitted in the first cell and the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 99) A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for determining whether to use measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or measurements of the low power wakeup-related signal for cell reselection based on a difference between reception quality of the SSB and reception quality of the low power wakeup-related signal in a serving cell. (Supplementary Note 100) The wireless terminal according to Supplementary Note 99, wherein the low power wakeup receiver is configured to receive at least a portion of the SSB. (Supplementary Note 101) The wireless terminal according to Supplementary Note 100, further comprising means for triggering wakeup of the primary transceiver to receive the SSB.(Supplementary Note 102) The wireless terminal of any one of Supplementary Notes 99 to 101, 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 an ultra-deep sleep power state. (Supplementary Note 103) A method performed by a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising determining whether to use measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or measurement of a low power wakeup-related signal for cell reselection based on a difference between reception quality of the SSB and reception quality of a low power wakeup-related signal in a serving cell. (Supplementary Note 104) A program for causing a computer to perform a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising determining whether to use measurement of the SSB or measurement of the low power wakeup-related signal for cell reselection based on a difference between reception quality of the Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) and reception quality of a low power wakeup-related signal in a serving cell.(Supplementary Note 105) A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for attempting cell reselection based on measurement of a low power wakeup-related signal using the low power wakeup receiver while the primary transceiver is in an ultra deep sleep power state, and for initiating cell reselection based on measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) if no suitable cell is found based on measurement of the low power wakeup-related signal. (Supplementary Note 106) The wireless terminal of Supplementary Note 105, wherein the low power wakeup receiver is configured to receive at least a portion of the SSB. (Supplementary Note 107) The wireless terminal of Supplementary Note 105, further comprising means for triggering wakeup of the primary transceiver to receive the SSB. (Supplementary Note 108) The wireless terminal of any one of Supplementary Notes 105 to 107, 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.(Supplementary Note 109) A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, the method comprising: while the primary transceiver is in an ultra-deep sleep power state, attempting cell reselection based on measurements of low power wake-up related signals using the low power wake-up receiver; and if no suitable cell is found based on measurements of the low power wake-up related signals, initiating cell reselection based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB). (Supplementary Note 110) A program 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 cell reselection based on measurement of a low power wake-up related signal using the low power wake-up receiver while the primary transceiver is in an ultra-deep sleep power state, and if no suitable cell is found based on the measurement of the low power wake-up related signal, initiating cell reselection based on measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB). (Supplementary Note 111) A distributed unit in a Radio Access Network (RAN) node, the distributed unit comprising: means for transmitting information indicating support or transmission status of a low power wake-up related signal in a first cell provided by the distributed unit to a central unit of the RAN node. (Supplementary Note 112) The distributed unit of Supplementary Note 111, wherein the transmitting means is adapted to transmit the information to the central unit in response to a request from the central unit. (Supplementary Note 113) A central unit of a Radio Access Network (RAN) node, comprising: means for receiving, from a distributed unit of the RAN node, information indicating support or transmission status of a low power wake-up related signal in a first cell provided by the distributed unit.(Supplementary Note 114) The central unit of Supplementary Note 113, further comprising means for requesting the distributed unit to send the information. (Supplementary Note 115) A method performed by a distributed unit of a Radio Access Network (RAN) node, comprising sending to the central unit of the RAN node information indicating support or transmission status of low power wake-up related signals in a first cell provided by the distributed unit. (Supplementary Note 116) A method performed by a central unit of a Radio Access Network (RAN) node, comprising receiving from a distributed unit of the RAN node information indicating support or transmission status of low power wake-up related signals in a first cell provided by the distributed unit. (Supplementary Note 117) A program for causing a computer to perform a method for a distributed unit of a Radio Access Network (RAN) node, the method comprising sending to the central unit of the RAN node information indicating support or transmission status of low power wake-up related signals in a first cell provided by the distributed unit. (Supplementary Note 118) A program for causing a computer to perform a method for a central unit of a Radio Access Network (RAN) node, the method comprising receiving, from a distributed unit of the RAN node, information indicating support or transmission status of low power wake-up related signals in a first cell provided by the distributed unit. (Supplementary Note 119) A distributed unit of a Radio Access Network (RAN) node, the distributed unit comprising: means for transmitting to the central unit of the RAN node information indicating a coverage mismatch, where coverage of low power wake-up related signals transmitted in a first cell provided by the distributed unit is smaller than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.(Supplementary Note 120) The distributed unit of Supplementary Note 119, wherein the transmitting means is adapted to transmit the information to the central unit in response to a request from the central unit. (Supplementary Note 121) A central unit of a Radio Access Network (RAN) node, comprising: means for receiving from the distributed unit of the RAN node information indicating a coverage mismatch where coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is smaller than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 122) The central unit of Supplementary Note 121, further comprising means for requesting the distributed unit to send the information. (Supplementary Note 123) A method performed by a distributed unit of a Radio Access Network (RAN) node, comprising: transmitting, to a central unit of the RAN node, information indicating a coverage mismatch between a coverage of a low power consumption wake-up related signal transmitted in a first cell provided by the distributed unit and a coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 124) A method performed by a central unit of a Radio Access Network (RAN) node, comprising: receiving, from a distributed unit of the RAN node, information indicating a coverage mismatch between a coverage of a low power consumption wake-up related signal transmitted in a first cell provided by the distributed unit and a coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.(Supplementary Note 125) A program for causing a computer to perform a method for a distributed unit of a Radio Access Network (RAN) node, the method comprising: transmitting, to a central unit of the RAN node, information indicating a coverage mismatch between a coverage of a low power consumption wake-up related signal transmitted in a first cell provided by the distributed unit and a coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell. (Supplementary Note 126) A program for causing a computer to perform a method for a central unit of a Radio Access Network (RAN) node, the method comprising: receiving, from a distributed unit of the RAN node, information indicating a coverage mismatch between a coverage of a low power consumption wake-up related signal transmitted in a first cell provided by the distributed unit and a coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

[0185] This application claims priority based on Japanese Patent Application No. 2023-139770, filed on August 30, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0186] 1 User Equipment (UE) 2 gNB 11 Main Radio (MR) 12 Low Power Wake-up Radio (LR) 21 Cell 1703 Baseband processor 1704 Application processor 1706 Memory 1707 Modules 1804 Processor 1805 Memory 1806 Modules

Claims

1. A Radio Access Network (RAN) node comprising: means for notifying a neighboring RAN node of support for or transmission status of a low power consumption wake-up related signal in a first cell of the RAN node, and for receiving from the neighboring RAN node support for or transmission status of the low power consumption wake-up related signal in a second cell of the neighboring RAN node.

2. The RAN node of claim 1, further comprising: means for transmitting information to a radio terminal in the first cell indicating support or transmission status of the low power consumption wake-up related signal in the second cell of the neighboring RAN node.

3. The RAN node of claim 2, wherein the means for transmitting to the radio terminal is adapted to transmit the information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via common system information in the first cell.

4. The RAN node of any one of claims 1 to 3, wherein the low power wake-up related signals are received by a low power wake-up receiver of a wireless terminal comprising a primary transceiver and a low power wake-up receiver, the primary transceiver being 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 an ultra deep sleep power state.

5. The RAN node of claim 4, wherein the low power wakeup related signals include: a low power wakeup signal that triggers a wakeup of the primary transceiver in the wireless terminal receiving the low power wakeup related signal at the low power wakeup receiver; and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state.

6. The RAN node of claim 4 or 5, further comprising means for informing the radio terminal whether measurements of the low power consumption wake-up related signals for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state should be made within a first frequency of the first cell or should be made both on the first frequency and on a second frequency different from the first frequency.

7. The RAN node of claim 6, wherein the means for informing the wireless terminal is adapted to explicitly indicate the second frequency to the wireless terminal.

8. The RAN node of claim 4 or 5, wherein the low power wake-up receiver is configured to receive at least a portion of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprising means for informing the wireless terminal whether measurements of the SSB by the low power wake-up receiver are required while the primary transceiver is in the ultra deep sleep power state.

9. The RAN node according to any one of claims 1 to 8, further comprising: means for transmitting information indicating a coverage mismatch, that is, a coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than a coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell, to a radio terminal.

10. The RAN node of claim 9, wherein information indicating the coverage mismatch in the first cell causes the wireless terminal to determine whether to perform cell reselection using measurements of the SSB or measurements of the low power consumption wake-up related signal.

11. The RAN node according to any one of claims 1 to 10, further comprising: means for transmitting information indicating a coverage mismatch, that is, a coverage of the low power consumption wake-up related signal transmitted in the second cell is smaller than a coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the second cell, to a radio terminal.

12. The RAN node of claim 11, wherein information indicating the coverage mismatch in the second cell causes the wireless terminal to determine whether to perform cell reselection using measurements of the SSB or measurements of the low power consumption wake-up related signal.

13. The RAN node according to any one of claims 1 to 12, further comprising means for transmitting information to the neighboring RAN node indicating that there is a coverage mismatch, where the coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

14. A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for receiving information from a network in a first cell indicative of support or transmission status of a low power wake-up related signal in a second cell.

15. The wireless terminal of claim 14, wherein said receiving means is adapted to receive said information using said primary transceiver.

16. A radio terminal according to claim 14 or 15, wherein the means for receiving is adapted to receive the information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via system information common in the first cell.

17. The wireless terminal of any one of claims 14 to 16, wherein the low power consumption wake-up related signals are received by the low power consumption wake-up receiver, 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 an ultra deep sleep power state.

18. The wireless terminal of claim 17, wherein the low power wakeup related signals include: a low power wakeup signal that triggers a wakeup of the primary transceiver in the wireless terminal receiving the low power wakeup related signal at the low power wakeup receiver; and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state.

19. The wireless terminal of claim 17 or 18, further comprising means for receiving from the network in the first cell whether measurements of the low power consumption wake-up related signals for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state should be made within a first frequency of the first cell or should be made both on the first frequency and on a second frequency different from the first frequency.

20. The wireless terminal of claim 17 or 18, wherein the low power wake-up receiver is configured to receive at least a portion of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprising means for receiving from the network whether measurement of the SSB by the low power wake-up receiver is required while the primary transceiver is in the ultra deep sleep power state.

21. The wireless terminal according to any one of claims 14 to 18, wherein the low power consumption wake-up receiver is configured to receive at least a portion of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprises: means for measuring an SSB of the first cell using the low power consumption wake-up receiver when a reception quality of the low power consumption wake-up related signal of the first cell falls below a first threshold; and means for measuring an SSB of an adjacent cell using the same frequency as the first cell using the low power consumption wake-up receiver when a reception quality of the low power consumption wake-up related signal of the first cell or a reception quality of the SSB falls below a second threshold.

22. The wireless terminal according to any one of claims 14 to 18, wherein the low power consumption wake-up receiver is configured to receive at least a portion of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB), and further comprising: means for measuring an SSB at a first frequency of the first cell using the low power consumption wake-up receiver when a reception quality of the low power consumption wake-up related signal of the first cell falls below a first threshold; and means for measuring an SSB at a second frequency different from the first frequency using the low power consumption wake-up receiver when a reception quality of the low power consumption wake-up related signal of the first cell or a reception quality of the SSB at the first frequency falls below a second threshold.

23. The wireless terminal according to any one of claims 14 to 18, further comprising means for preferentially selecting, in cell reselection, a neighboring cell that supports or transmits the low power consumption wake-up related signal, compared to a neighboring cell that does not support or transmit the low power consumption wake-up related signal.

24. The wireless terminal of any one of claims 14 to 18 and 23, further comprising means for, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power wake-up receiver if the new serving cell supports or transmits the low power wake-up related signal.

25. The wireless terminal according to any one of claims 14 to 24, further comprising means for receiving information from the network indicating that there is a coverage mismatch, that is, the coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

26. The wireless terminal of claim 25, further comprising: means for determining whether to use the measurement of the SSB or the measurement of the low power consumption wake-up related signal for cell reselection based on information indicating the coverage mismatch in the first cell.

27. The wireless terminal according to any one of claims 14 to 26, further comprising means for receiving, in the first cell, information indicating a coverage mismatch from the network, where the coverage of the low power consumption wake-up related signal transmitted in the second cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the second cell.

28. The wireless terminal of claim 27, further comprising: means for determining whether to use the measurement of the SSB or the measurement of the low power consumption wake-up related signal for cell reselection based on information indicating the coverage mismatch in the second cell.

29. A wireless terminal as claimed in any one of claims 14 to 24, further comprising means for determining whether to use measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or measurements of the low power consumption wake-up related signal for cell reselection based on a difference between the reception quality of the Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) in the first cell and the reception quality of the low power consumption wake-up related signal.

30. The wireless terminal of any one of claims 14 to 24, further comprising means for attempting cell reselection based on measurements of the low power consumption wake-up related signals while the primary transceiver is in the ultra deep sleep power state, and for initiating cell reselection based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) if a suitable cell is not found based on measurements of the low power consumption wake-up related signals.

31. A method performed by a Radio Access Network (RAN) node, comprising: notifying a neighboring RAN node of support for or transmission status of a low power consumption wake-up related signal in a first cell of the RAN node; and receiving from the neighboring RAN node support for or transmission status of the low power consumption wake-up related signal in a second cell of the neighboring RAN node.

32. A method performed by a wireless terminal, comprising receiving information from a network in a first cell indicating support or transmission status of low power consumption wake-up related signals in a second cell.

33. A program for causing a computer to execute a method for a Radio Access Network (RAN) node, the method comprising: notifying a neighboring RAN node of support for or transmission status of a low power consumption wake-up related signal in a first cell of the RAN node; and receiving from the neighboring RAN node support for or transmission status of the low power consumption wake-up related signal in a second cell of the neighboring RAN node.

34. A program for causing a computer to perform a method for a wireless terminal, the method comprising receiving, in a first cell, information from a network indicating support or transmission status of a low power consumption wake-up related signal in a second cell.

35. A Radio Access Network (RAN) node comprising: means for transmitting information to a radio terminal in a first cell of the RAN node indicating support or transmission status of a low power consumption wake-up related signal in a second cell of a neighboring RAN node.

36. The RAN node of claim 35, wherein the means for transmitting to the wireless terminal is adapted to transmit the information via a Radio Resource Control (RRC) message dedicated to the wireless terminal or via common system information within the first cell.

37. The RAN node of claim 35 or 36, wherein the low power wake-up related signals are received by the low power wake-up receiver of the wireless terminal comprising a primary transceiver and a low power wake-up receiver, the primary transceiver being 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 an ultra deep sleep power state.

38. The RAN node of claim 37, wherein the low power wakeup related signals include: a low power wakeup signal that triggers wakeup of the primary transceiver in the wireless terminal receiving the low power wakeup related signal at the low power wakeup receiver; and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state.

39. A method performed by a Radio Access Network (RAN) node, comprising: transmitting information to a radio terminal in a first cell of the RAN node indicating support or transmission status of low power consumption wake-up related signals in a second cell of a neighboring RAN node.

40. A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising transmitting information to a wireless terminal in a first cell of the RAN node indicating support or transmission status of a low power consumption wake-up related signal in a second cell of an adjacent RAN node.

41. A Radio Access Network (RAN) node comprising: means for transmitting information regarding low power wake-up related signals in a first cell to a wireless terminal, the information indicating whether measurements of the low power wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra deep sleep power state should be made within a first frequency of the first cell or should be made both on the first frequency and on a second frequency different from the first frequency.

42. The RAN node of claim 41, wherein the information indicates the second frequency to the wireless terminal.

43. The RAN node according to claim 41 or 42, wherein the means for transmitting is adapted to transmit the information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via common system information within the first cell.

44. The RAN node of any one of claims 41 to 43, wherein the low power wake-up related signals include low power synchronization or reference signals monitored for the radio resource management measurements while the primary transceiver is in the ultra deep sleep power state.

45. The RAN node of any one of claims 41 to 44, wherein the low power wake-up related signals are received by the low power wake-up receiver of the wireless terminal comprising the primary transceiver and the low power wake-up receiver, the primary transceiver being 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.

46. ​​A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for receiving information from a network in a first cell regarding low power wake-up related signals, the information indicating whether measurements of the low power wake-up related signals for radio resource management measurements while the primary transceiver is in an ultra deep sleep power state need to be made within a first frequency of the first cell or both the first frequency and a second frequency different from the first frequency.

47. A method performed by a Radio Access Network (RAN) node, comprising: transmitting information regarding low power consumption wake-up related signals to a wireless terminal in a first cell, the information indicating whether measurements of the low power consumption wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra deep sleep power state should be performed within a first frequency of the first cell or should be performed both on the first frequency and on a second frequency different from the first frequency.

48. A method performed by a wireless terminal, comprising receiving information from a network in a first cell regarding low power consumption wake-up related signals, the information indicating whether measurements of the low power consumption wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra deep sleep power state should be performed within a first frequency of the first cell or should be performed both on the first frequency and on a second frequency different from the first frequency.

49. A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising transmitting information regarding low power consumption wake-up related signals to a wireless terminal in a first cell, the information indicating whether measurements of the low power consumption wake-up related signals for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra deep sleep power state should be made within a first frequency of the first cell or should be made both on the first frequency and on a second frequency different from the first frequency.

50. A program for causing a computer to perform a method for a wireless terminal, the method comprising receiving information from a network in a first cell regarding a low power consumption wake-up related signal, the information indicating whether measurements of the low power consumption wake-up related signal for radio resource management measurements while a primary transceiver of the wireless terminal is in an ultra deep sleep power state need to be performed within a first frequency of the first cell or both the first frequency and a second frequency different from the first frequency.

51. A Radio Access Network (RAN) node comprising: means for transmitting, in a first cell, information relating to low power wake-up related signals to a wireless terminal, said information indicating whether or not measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state.

52. The RAN node of claim 51, wherein the means for transmitting is adapted to transmit the information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via common system information within the first cell.

53. The RAN node of claim 51 or 52, wherein the low power wakeup related signals include one or both of: a low power wakeup signal that triggers wakeup of the primary transceiver in the wireless terminal receiving the low power wakeup related signal at the low power wakeup receiver; and a low power synchronization or reference signal that is monitored for radio resource management measurements while the primary transceiver is in the ultra deep sleep power state.

54. The RAN node of any one of claims 51 to 53, wherein the low power wake-up related signals are received by the low power wake-up receiver of the wireless terminal; and 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.

55. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for receiving information from a network in a first cell relating to a low power wakeup related signal, the information indicating whether or not measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by the low power wakeup receiver while the primary transceiver is in an ultra deep sleep power state.

56. The wireless terminal of claim 55, wherein the low power wake-up related signals are received by the low power wake-up receiver; 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; 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; and the low power wake-up receiver is configured to receive at least a portion of an SSB.

57. A method performed by a Radio Access Network (RAN) node, comprising: transmitting information regarding low power wake-up related signals to a wireless terminal in a first cell, the information indicating whether or not measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra-deep sleep power state.

58. A method performed by a wireless terminal, comprising receiving information from a network in a first cell relating to a low power wake-up related signal, the information indicating whether or not measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state.

59. A program for causing a computer to perform a method for a Radio Access Network (RAN) node, the method comprising transmitting information regarding low power wake-up related signals to a wireless terminal in a first cell, the information indicating whether measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state.

60. A program for causing a computer to execute a method for a wireless terminal, the method comprising receiving information from a network in a first cell regarding a low power wake-up related signal, the information indicating whether or not measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) are required by a low power wake-up receiver of the wireless terminal while a primary transceiver of the wireless terminal is in an ultra deep sleep power state.

61. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for performing cell reselection using the low power wakeup receiver, the means for performing cell reselection being adapted to: measure a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measure an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

62. The wireless terminal of claim 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 low power wake-up related signals; 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; and the low power wake-up receiver is configured to receive at least a portion of an SSB.

63. A method performed by a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising performing cell reselection using the low power wakeup receiver, the cell reselection including: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

64. A program for causing a computer to execute a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, the method comprising performing cell reselection using the low power wakeup receiver, the performing cell reselection including: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB of a neighboring cell on the same frequency as the serving cell using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

65. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for performing cell reselection using the low power wakeup receiver, the means for performing cell reselection being adapted to: measure a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) at a first frequency of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measure an SSB at a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB at the first frequency falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

66. The wireless terminal of claim 65, 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; 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; and the low power wake-up receiver is configured to receive at least a portion of an SSB.

67. A method performed by a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising performing cell reselection using the low power wakeup receiver, the performing cell reselection including: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) at a first frequency of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB at a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB at the first frequency falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

68. A program for causing a computer to execute a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, the method comprising performing cell reselection using the low power wakeup receiver, the performing cell reselection including: measuring a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) at a first frequency of the serving cell using the low power wakeup receiver when a reception quality of a low power wakeup related signal of the serving cell of the wireless terminal falls below a first threshold while the primary transceiver is in an ultra deep sleep power state; and measuring an SSB at a second frequency different from the first frequency using the low power wakeup receiver when a reception quality of the low power wakeup related signal of the serving cell or a reception quality of the SSB at the first frequency falls below a second threshold while the primary transceiver is in the ultra deep sleep power state.

69. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for preferentially selecting neighboring cells that support or transmit low power wakeup related signals in cell reselection over neighboring cells that do not support or transmit low power wakeup related signals.

70. The wireless terminal of claim 69, further comprising means for, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power wake-up receiver if the new serving cell supports or transmits the low power wake-up related signal.

71. The wireless terminal of claim 70, wherein the cell reselection includes: triggering a wake-up of the primary transceiver based on measurements of the low power wake-up related signals with the low power wake-up receiver while the primary transceiver is in the ultra deep sleep power state; and determining the new serving cell based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or a Channel State Information Reference Signal (CSI-RS) with the primary transceiver.

72. The wireless terminal of any one of claims 69 to 71, wherein the low power wake-up related signals are received by the low power wake-up receiver, 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 an ultra deep sleep power state.

73. A method performed by a wireless terminal having a primary transceiver and a low power wakeup receiver, comprising preferentially selecting neighboring cells that support or transmit low power wakeup related signals in cell reselection over neighboring cells that do not support or transmit said low power wakeup related signals.

74. A program for causing a computer to perform a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, the method comprising preferentially selecting neighboring cells that support or transmit low power wakeup related signals in cell reselection over neighboring cells that do not support or transmit low power wakeup related signals.

75. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for, after moving to a new serving cell by cell reselection using measurements by the primary transceiver, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power wakeup receiver if the new serving cell supports or transmits a low power wakeup related signal.

76. The wireless terminal of claim 75, wherein the cell reselection includes: triggering a wake-up of the primary transceiver based on measurements of the low power wake-up related signals with the low power wake-up receiver while the primary transceiver is in the ultra deep sleep power state; and determining the new serving cell based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or a Channel State Information Reference Signal (CSI-RS) with the primary transceiver.

77. The wireless terminal of claim 75 or 76, wherein the low power wake-up related signals are received by the low power wake-up receiver; 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.

78. A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising: after moving to a new serving cell by cell reselection using measurements by the primary transceiver, if the new serving cell supports or transmits low power wake-up related signals, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power wake-up receiver.

79. 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: after moving to a new serving cell by cell reselection using measurements by the primary transceiver, if the new serving cell supports or transmits low power wake-up related signals, changing the primary transceiver to an ultra-deep sleep power state and switching to reception by the low power wake-up receiver.

80. A Radio Access Network (RAN) node comprising: means for transmitting first information in a first cell to a wireless terminal regarding a low power consumption wake-up related signal, the first information indicating a coverage mismatch in which the coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

81. The RAN node of claim 80, wherein the first information causes the wireless terminal to determine whether to perform cell reselection using measurements of the SSB or measurements of the low power wake-up related signal.

82. The RAN node of claim 80 or 81, further comprising means for transmitting second information to the radio terminal, the second information indicating a coverage mismatch, where the coverage of a low power consumption wake-up related signal transmitted in a second cell adjacent to the first cell is smaller than the coverage of an SSB transmitted in the second cell.

83. The RAN node of claim 82, wherein the second information causes the wireless terminal to determine whether to perform cell reselection using measurements of the SSB or measurements of the low power wake-up related signal.

84. The RAN node of any one of claims 80 to 83, further comprising means for transmitting third information to a neighboring RAN node associated with a second cell adjacent to the first cell, the third information indicating a coverage mismatch, where the coverage of the low power wake-up related signal transmitted in the first cell is smaller than the coverage of the SSB transmitted in the first cell.

85. A RAN node according to any one of claims 80 to 84, wherein the means for transmitting the first information is adapted to transmit the first information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via common system information within the first cell.

86. The RAN node of any one of claims 80 to 84, wherein the means for transmitting the first information is adapted to transmit the first information via the low power wake-up related signal of the first cell.

87. The RAN node of any one of claims 80 to 86, wherein the low power wake-up related signals are received by the low power wake-up receiver of the wireless terminal comprising a primary transceiver and a low power wake-up receiver, the primary transceiver being 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 an ultra deep sleep power state.

88. A wireless terminal comprising: a primary transceiver; a low power consumption wake-up receiver; and means for receiving first information from a network in a first cell relating to a low power consumption wake-up related signal, the first information indicating a coverage mismatch in which the coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

89. The wireless terminal of claim 88, further comprising means for determining whether to use the measurement of the SSB or the measurement of the low power consumption wake-up related signal for cell reselection based on the first information.

90. The wireless terminal of claim 88 or 89, further comprising means for receiving second information from the network in the first cell indicating that there is a coverage mismatch, in which the coverage of a low power consumption wake-up related signal transmitted in a second cell adjacent to the first cell is smaller than the coverage of an SSB transmitted in the second cell.

91. The wireless terminal of claim 90, further comprising means for determining whether to use the measurement of the SSB or the measurement of the low power consumption wake-up related signal for cell reselection based on the second information.

92. A radio terminal according to any one of claims 88 to 91, wherein the means for receiving the first information is adapted to receive the first information via a Radio Resource Control (RRC) message dedicated to the radio terminal or via system information common within the first cell.

93. A wireless terminal according to any one of claims 88 to 91, wherein the means for receiving the first information is adapted to receive the first information via the low power consumption wake-up related signal of the first cell.

94. The wireless terminal of any one of claims 88 to 93, wherein the low power wake-up related signals are received by the low power wake-up receiver, 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 an ultra deep sleep power state.

95. A method performed by a Radio Access Network (RAN) node, comprising: transmitting information regarding a low power consumption wake-up related signal to a wireless terminal in a first cell, the information indicating a coverage mismatch in which coverage of the low power consumption wake-up related signal transmitted in the first cell is less than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

96. A method performed by a wireless terminal, comprising receiving first information from a network in a first cell regarding a low power consumption wake-up related signal, the first information indicating a coverage mismatch in which the coverage of the low power consumption wake-up related signal transmitted in the first cell is smaller than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

97. A program for causing a computer to execute a method for a Radio Access Network (RAN) node, the method comprising: transmitting first information regarding a low power consumption wake-up related signal to a wireless terminal in a first cell, the first information indicating a coverage mismatch in which the coverage of the low power consumption wake-up related signal transmitted in the first cell is less than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

98. A program for causing a computer to execute a method for a wireless terminal, the method comprising receiving first information from a network in a first cell regarding a low power consumption wake-up related signal, the first information indicating a coverage mismatch in which the coverage of the low power consumption wake-up related signal transmitted in the first cell is less than the coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

99. A wireless terminal comprising: a primary transceiver; a low power wake-up receiver; and means for determining whether to use measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or measurements of a low power wake-up related signal for cell reselection based on a difference between the reception quality of the SSB and the reception quality of the low power wake-up related signal in a serving cell.

100. The wireless terminal of claim 99, wherein the low power wake-up receiver is configured to receive at least a portion of the SSB.

101. The wireless terminal of claim 100, further comprising: means for triggering a wake-up of said primary transceiver to receive said SSB.

102. The wireless terminal of any one of claims 99 to 101, 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 an ultra deep sleep power state.

103. A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, comprising determining whether to use measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or measurements of a low power wake-up related signal for cell reselection based on a difference between a reception quality of the SSB in a serving cell and a reception quality of the low power wake-up related signal.

104. 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: determining whether to use measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) or measurements of a low power wake-up related signal for cell reselection based on a difference between the reception quality of the SSB in a serving cell and the reception quality of the low power wake-up related signal.

105. A wireless terminal comprising: a primary transceiver; a low power wakeup receiver; and means for attempting cell reselection based on measurement of a low power wakeup related signal using the low power wakeup receiver while the primary transceiver is in an ultra deep sleep power state, and initiating cell reselection based on measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) if a suitable cell is not found based on measurement of the low power wakeup related signal.

106. The wireless terminal of claim 105, wherein the low power wake-up receiver is configured to receive at least a portion of the SSB.

107. The wireless terminal of claim 105, further comprising: means for triggering a wake-up of said primary transceiver to receive said SSB.

108. The wireless terminal of any one of claims 105 to 107, 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.

109. A method performed by a wireless terminal having a primary transceiver and a low power wake-up receiver, the method comprising: while the primary transceiver is in an ultra-deep sleep power state, attempting cell reselection based on measurements of low power wake-up related signals using the low power wake-up receiver, and if no suitable cell is found based on measurements of the low power wake-up related signals, initiating cell reselection based on measurements of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB).

110. A program for causing a computer to execute a method for a wireless terminal having a primary transceiver and a low power wakeup receiver, the method comprising: attempting cell reselection based on measurement of a low power wakeup related signal using the low power wakeup receiver while the primary transceiver is in an ultra deep sleep power state; and if no suitable cell is found based on measurement of the low power wakeup related signal, initiating cell reselection based on measurement of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB).

111. A distributed unit of a Radio Access Network (RAN) node, comprising: means for transmitting information indicating support or transmission status of a low power wake-up related signal in a first cell provided by the distributed unit to a central unit of the RAN node.

112. A distributed unit according to claim 111, wherein said means for transmitting is adapted to transmit said information to said central unit in response to a request from said central unit.

113. A central unit of a Radio Access Network (RAN) node, comprising: means for receiving, from a distributed unit of the RAN node, information indicating support or transmission status of a low power wake-up related signal in a first cell provided by the distributed unit.

114. The central unit of claim 113, further comprising means for requesting the distributed units to send the information.

115. A method performed by a distributed unit of a Radio Access Network (RAN) node, comprising: transmitting information to a central unit of the RAN node indicating support or transmission status of a low power wake-up related signal in a first cell provided by the distributed unit.

116. A method performed by a central unit of a Radio Access Network (RAN) node, comprising receiving, from a distributed unit of the RAN node, information indicative of support or transmission status of a low power wake-up related signal in a first cell provided by the distributed unit.

117. A program for causing a computer to perform a method for a distributed unit of a Radio Access Network (RAN) node, the method comprising: transmitting information to a central unit of the RAN node indicating support or transmission status of a low power consumption wake-up related signal in a first cell provided by the distributed unit.

118. A program for causing a computer to perform a method for a central unit of a Radio Access Network (RAN) node, the method comprising receiving, from a distributed unit of the RAN node, information indicative of support or transmission status of a low power wake-up related signal in a first cell provided by the distributed unit.

119. A distributed unit of a Radio Access Network (RAN) node, comprising: means for transmitting information to a central unit of the RAN node indicating a coverage mismatch, where a coverage of a low power wake-up related signal transmitted in a first cell served by the distributed unit is smaller than a coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

120. A distributed unit according to claim 119, wherein said means for transmitting is adapted to transmit said information to said central unit in response to a request from said central unit.

121. A central unit of a Radio Access Network (RAN) node, comprising: means for receiving, from a distributed unit of the RAN node, information indicating a coverage mismatch in which coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is smaller than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

122. The central unit of claim 121, further comprising means for requesting the distributed units to send the information.

123. A method performed by a distributed unit of a Radio Access Network (RAN) node, comprising: transmitting information to a central unit of the RAN node indicating a coverage mismatch, where coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is less than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

124. A method performed by a central unit of a Radio Access Network (RAN) node, comprising receiving information from a distributed unit of the RAN node indicating a coverage mismatch in which coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is less than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

125. A program for causing a computer to execute a method for a distributed unit of a Radio Access Network (RAN) node, the method comprising: transmitting information to a central unit of the RAN node indicating a coverage mismatch, where coverage of a low power consumption wake-up related signal transmitted in a first cell provided by the distributed unit is less than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

126. A program for causing a computer to execute a method for a central unit of a Radio Access Network (RAN) node, the method comprising receiving information from a distributed unit of the RAN node indicating a coverage mismatch in which coverage of a low power wake-up related signal transmitted in a first cell provided by the distributed unit is less than coverage of a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block (SSB) transmitted in the first cell.

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