WO2025201705A1

WO2025201705A1 - Minimization of paging interruption time during acquisition of system information on demand

Info

Publication number: WO2025201705A1
Application number: PCT/EP2025/052743
Authority: WO
Inventors: Navin Hathiramani; Mads LAURIDSEN; Mohamad SAYED HASSAN
Original assignee: Nokia Technologies Oy
Current assignee: Nokia Technologies Oy
Priority date: 2024-03-28
Filing date: 2025-02-04
Publication date: 2025-10-02
Anticipated expiration: 2026-09-28

Abstract

Systems, methods, apparatuses, and computer program products for acquiring information of a cell where SIB1 is transmitted on demand from an anchor cell. One method may include receiving, by a user equipment (UE), a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information of a capacity cell from an anchor cell; determining a WUS transmission condition for transmitting the WUS to the capacity cell; and responsive to determining the WUS transmission condition, transmitting a WUS to the capacity cell. The method may further include the UE, after transmitting the WUS to the capacity cell, determining to acquire a SIB1 from the capacity cell, and responsive thereto, acquiring the SIB1 from the capacity cell.

Description

TITLE

MINIMIZATION OF PAGING INTERRUPTION TIME DURING ACQUISITION OF SYSTEM INFORMATION ON DEMAND

TECHNICAL FIELD

[0001] Some example embodiments may generally relate to mobile or wireless telecommunication systems, such as 3^rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), 5^th generation (5G) radio access technology (RAT), new radio (NR) access technology, 6^th generation (6G), and/or other communications systems. For example, certain example embodiments may relate to systems and/or methods for acquiring information of a cell where system information block 1 (SIB 1) is transmitted on demand from a capacity cell.

BACKGROUND

[0002] Examples of mobile or wireless telecommunication systems may include radio frequency (RF) 5G RAT, the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), LTE Evolved UTRAN (E-UTRAN), LTE- Advanced (LTE-A), LTE-A Pro, NR access technology, and/or MulteFire Alliance. 5G wireless systems refer to the next generation (NG) of radio systems and network architecture. A 5G system is typically built on a 5G NR, but a 5G (or NG) network may also be built on E- UTRA radio. It is expected that NR can support service categories such as enhanced mobile broadband (eMBB), ultra-reliable low-latency-communication (URLLC), and massive machine-type communication (mMTC). NR is expected to deliver extreme broadband, ultra- robust, low-latency connectivity, and massive networking to support the Internet of Things (loT). The next generation radio access network (NG-RAN) represents the radio access network (RAN) for 5G, which may provide radio access for NR, LTE, and LTE-A. It is noted that the nodes in 5G providing radio access functionality to a user equipment (e.g., similar to the Node B in UTRAN or the Evolved Node B (eNB) in LTE) may be referred to as next-generation Node B (gNB) when built on NR radio, and may be referred to as next-generation eNB (NG- eNB) when built on E-UTRA radio.

[0003] Various techniques exist to minimize network energy consumption by reducing the number of transmissions from the perspective of the network. Because networks may have extended periods of time with low load, opportunities exist to save additional energy, for example, by reducing the transmission of always on periodic signals. For example, cells in a network may enter an energy saving mode by implementing energy saving measures (e.g., suspending transmission of SIB1, enabling SIB1 on demand).

[0004] There is an ongoing need, however, for efficient and reliable techniques for returning to operational status cells in an energy saving mode while at the same time minimizing disruption of data communication in the network.

SUMMARY

[0005] In accordance with some example embodiments, an apparatus comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least: to receive a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information of a capacity cell from an anchor cell; to determine a WUS transmission condition for transmitting the WUS to the capacity cell; and responsive to determining the WUS transmission condition, to transmit a WUS to the capacity cell.

[0006] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition by determining based on the WUS configuration a next WUS occasion of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected WUS occasion; and to transmit the WUS to the capacity cell during the selected WUS occasion.

[0007] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the selected WUS occasion to be free from collision with any anchor cell paging occasion by determining a WUS occasion spacing between the selected WUS occasion and the anchor cell paging occasion to be at least a predetermined minimum WUS occasion spacing.

[0008] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition by: receiving a paging early indication (PEI) of the anchor cell; and determining the WUS transmission condition based on the PEI.

[0009] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition based on the PEI by determining that the PEI indicates no anchor cell paging occasion of the anchor cell during the selected WUS occasion of the capacity cell. [0010] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition based on the PEI by determining that the PEI indicates an anchor cell paging occasion of the anchor cell during the selected WUS occasion that is free from a subgroup containing the apparatus.

[0011] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition by determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

[0012] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition while camping on the anchor cell.

[0013] In accordance with some example embodiments, the instructions, when executed by the at least one processor, further cause the apparatus at least: prior to determining the WUS transmission condition, to measure the capacity cell and to determine that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled.

[0014] In accordance with some example embodiments, the instructions, when executed by the at least one processor, further cause the apparatus at least: responsive to determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled, to bar reselection of the capacity cell until the capacity cell SIB1 is acquired.

[0015] In accordance with some example embodiments, the instructions, when executed by the at least one processor, further cause the apparatus at least: after transmitting the WUS to the capacity cell, to determine to acquire a SIB1 from the capacity cell; and responsive thereto, to acquire the SIB1 from the capacity cell.

[0016] In accordance with some example embodiments, the instructions, when executed by the at least one processor, further cause the apparatus at least: to determine to acquire the SIB1 from the capacity cell comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure. [0017] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine to acquire the SIB1 from the capacity cell by determining based on the SIB1 timing information a next SIB1 transmission window of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell as a selected SIB1 transmission window; and to acquire the SIB1 from the capacity cell during the selected SIB1 transmission window.

[0018] In accordance with some example embodiments, the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the SIB1 transmission window of the capacity cell to be free from collision with any anchor cell paging occasion of the anchor cell by determining a SIB1 transmission window spacing between the selected SIB1 transmission window and any anchor cell paging occasion to be at least a predetermined minimum SIB1 transmission window spacing.

[0019] In accordance with some example embodiments, the instructions, when executed by the at least one processor, further cause the apparatus at least: after transmitting the WUS to the capacity cell and before acquiring the SIB1 from the capacity cell, to determine that at least one anchor cell paging occasion precedes the selected SIB1 transmission window, and in response to resynchronize to the anchor cell before all of the at least one anchor cell paging occasion, and then to resynchronize to the capacity cell after all of the at least one anchor cell paging occasion and before the selected SIB1 transmission window.

[0020] In accordance with some example embodiments, the instructions, when executed by the at least one processor, further cause the apparatus at least: after acquiring the SIB1 from the capacity cell, to perform a cell reselection procedure to determine reselection to the capacity cell.

[0021] In accordance with some example embodiments, an apparatus comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least: to receive a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information from a capacity cell; and to transmit the WUS configuration and SIB1 timing information of the capacity cell to a user equipment (UE).

[0022] In accordance with some example embodiments, an apparatus comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least: to enable system information block 1 (SIB1) on demand functionality at a capacity cell; and to transmit wake-up signal (WUS) configuration and SIB1 timing information of the capacity cell to an anchor cell.

[0023] In accordance with some example embodiments, an apparatus comprises: means for receiving a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information of a capacity cell from an anchor cell; means for determining a WUS transmission condition for transmitting the WUS to the capacity cell; and means for, responsive to determining the WUS transmission condition, transmitting a WUS to the capacity cell.

[0024] In accordance with some example embodiments, determining the WUS transmission condition comprises determining based on the WUS configuration a next WUS occasion of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected WUS occasion; and transmitting the WUS comprises transmitting the WUS to the capacity cell during the selected WUS occasion.

[0025] In accordance with some example embodiments, determining the selected WUS occasion to be free from collision with any anchor cell paging occasion comprises determining a WUS occasion spacing between the selected WUS occasion and the anchor cell paging occasion to be at least a predetermined minimum WUS occasion spacing.

[0026] In accordance with some example embodiments, determining the WUS transmission condition comprises: receiving a paging early indication (PEI) of the anchor cell; and determining the WUS transmission condition based on the PEI.

[0027] In accordance with some example embodiments, determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates no anchor cell paging occasion of the anchor cell during the selected WUS occasion of the capacity cell.

[0028] In accordance with some example embodiments, determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates an anchor cell paging occasion of the anchor cell during the selected WUS occasion that is free from a subgroup containing the apparatus.

[0029] In accordance with some example embodiments, determining the WUS transmission condition comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure. [0030] In accordance with some example embodiments, the apparatus is operable to determine the WUS transmission condition while the apparatus is camping on the anchor cell.

[0031] In accordance with some example embodiments, the apparatus further comprises: means for, prior to determining the WUS transmission condition, measuring the capacity cell and determining that the capacity cell meets cell reselection criteria and has SIB 1 on demand functionality enabled.

[0032] In accordance with some example embodiments, the apparatus further comprises: means for, responsive to determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled, barring reselection of the capacity cell until the capacity cell SIB1 is acquired.

[0033] In accordance with some example embodiments, the apparatus further comprises: means for, after transmitting the WUS to the capacity cell, determining to acquire a SIB1 from the capacity cell, and responsive thereto, acquiring the SIB1 from the capacity cell.

[0034] In accordance with some example embodiments, determining to acquire the SIB1 from the capacity cell comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

[0035] In accordance with some example embodiments, determining to acquire the SIB1 from the capacity cell comprises determining based on the SIB1 timing information a next SIB1 transmission window of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell as a selected SIB1 transmission window; and acquiring the SIB1 from the capacity cell comprises acquiring the SIB1 from the capacity cell during the selected SIB1 transmission window.

[0036] In accordance with some example embodiments, determining the SIB1 transmission window of the capacity cell to be free from collision with any anchor cell paging occasion of the anchor cell comprises determining a SIB1 transmission window spacing between the selected SIB1 transmission window and any anchor cell paging occasion to be at least a predetermined minimum SIB1 transmission window spacing.

[0037] In accordance with some example embodiments, the apparatus further comprises: means for, after transmitting the WUS to the capacity cell and before acquiring the SIB1 from the capacity cell, determining that at least one anchor cell paging occasion precedes the selected SIB1 transmission window, and in response resynchronizing to the anchor cell before all of the at least one anchor cell paging occasion, and then resynchronizing to the capacity cell after all of the at least one anchor cell paging occasion and before the selected SIB1 transmission window.

[0038] In accordance with some example embodiments, the apparatus further comprises: means for, after acquiring the SIB1 from the capacity cell, performing a cell reselection procedure to determine reselection to the capacity cell.

[0039] In accordance with some example embodiments, an apparatus comprises: means for receiving a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information from a capacity cell; and means for transmitting the WUS configuration and SIB1 timing information of the capacity cell to a user equipment (UE).

[0040] In accordance with some example embodiments, an apparatus comprises: means for enabling system information block 1 (SIB1) on demand functionality at a capacity cell; and means for transmitting wake-up signal (WUS) configuration and SIB1 timing information of the capacity cell to an anchor cell.

[0041] In accordance with some example embodiments, the SIB1 timing information defines a timing of transmissions of the SIB1 by the capacity cell responsive to receiving a WUS at the capacity cell.

[0042] In accordance with some example embodiments, the SIB1 timing information defines a periodicity of transmissions of the SIB1 by the capacity cell responsive to receiving the WUS at the capacity cell.

[0043] In accordance with some example embodiments, the SIB1 timing information defines a predetermined delay between receiving the WUS at the capacity cell and transmissions of the SIB1 by the capacity cell.

[0044] In accordance with some example embodiments, a method comprises: receiving a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information of a capacity cell from an anchor cell; determining a WUS transmission condition for transmitting the WUS to the capacity cell; and responsive to determining the WUS transmission condition, transmitting a WUS to the capacity cell.

[0045] In accordance with some example embodiments, determining the WUS transmission condition comprises determining based on the WUS configuration a next WUS occasion of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected WUS occasion; and transmitting the WUS to the capacity cell comprises transmitting the WUS to the capacity cell during the selected WUS occasion.

[0046] In accordance with some example embodiments, determining the selected WUS occasion to be free from collision with any anchor cell paging occasion comprises determining a WUS occasion spacing between the selected WUS occasion and the anchor cell paging occasion to be at least a predetermined minimum WUS occasion spacing.

[0047] In accordance with some example embodiments, determining the WUS transmission condition comprises: receiving a paging early indication (PEI) of the anchor cell; and determining the WUS transmission condition based on the PEI.

[0048] In accordance with some example embodiments, determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates no anchor cell paging occasion of the anchor cell during the selected WUS occasion of the capacity cell.

[0049] In accordance with some example embodiments, determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates an anchor cell paging occasion of the anchor cell during the selected WUS occasion that is free from a subgroup containing the apparatus.

[0050] In accordance with some example embodiments, determining the WUS transmission condition comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

[0051] In accordance with some example embodiments, the method comprises: determining the WUS transmission condition by a user equipment (UE) while the UE is camping on the anchor cell.

[0052] In accordance with some example embodiments, the method further comprises: prior to determining the WUS transmission condition, measuring the capacity cell and determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled.

[0053] In accordance with some example embodiments, the method further comprises: responsive to determining that the capacity cell meets cell reselection criteria and has SIB 1 on demand functionality enabled, barring reselection of the capacity cell until the capacity cell SIB1 is acquired. [0054] In accordance with some example embodiments, the method further comprises: after transmitting the WUS to the capacity cell, determining to acquire a SIB1 from the capacity cell, and responsive thereto, acquiring the SIB1 from the capacity cell.

[0055] In accordance with some example embodiments, determining to acquire the SIB1 from the capacity cell comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

[0056] In accordance with some example embodiments, determining to acquire the SIB1 from the capacity cell comprises determining based on the SIB1 timing information a next SIB1 transmission window of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected SIB1 transmission window; and acquiring the SIB1 from the capacity cell comprises acquiring the SIB1 from the capacity cell during the selected SIB1 transmission window.

[0057] In accordance with some example embodiments, determining the SIB1 transmission window of the capacity cell to be free from collision with any anchor cell paging occasion of the anchor cell comprises determining a SIB1 transmission window spacing between the selected SIB1 transmission window and any anchor cell paging occasion to be at least a predetermined minimum SIB1 transmission window spacing.

[0058] In accordance with some example embodiments, the method further comprises: after determining to acquire the SIB1 of the capacity cell and before acquiring the SIB1 from the capacity cell, determining that at least one anchor cell paging occasion precedes the selected SIB1 transmission window, and in response resynchronizing to the anchor cell before all of the at least one anchor cell paging occasion, and then resynchronizing to the capacity cell after all of the at least one anchor cell paging occasion and before the selected SIB 1 transmission window.

[0059] In accordance with some example embodiments, the method further comprises: after acquiring the SIB1 from the capacity cell, performing a cell reselection procedure to determine reselection to the capacity cell.

[0060] In accordance with some example embodiments, a method comprises: receiving, at an anchor cell, a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information from a capacity cell; and transmitting the WUS configuration and SIB1 timing information of the capacity cell to a user equipment (UE). [0061] In accordance with some example embodiments, a method comprises: enabling, at a capacity cell, system information block 1 (SIB1) on demand functionality; and transmitting wake-up signal (WUS) configuration and SIB1 timing information of the capacity cell to an anchor cell. In accordance with some example embodiments, the SIB1 timing information defines a timing of transmissions of the SIB1 by the capacity cell responsive to receiving a WUS at the capacity cell.

[0062] In accordance with some example embodiments, the SIB1 timing information defines a periodicity of transmissions of the SIB1 by the capacity cell responsive to receiving the WUS at the capacity cell.

[0063] In accordance with some example embodiments, the SIB1 timing information defines a predetermined delay between receiving the WUS at the capacity cell and transmissions of the SIB1 by the capacity cell.

[0064] In accordance with some example embodiments, a non-transitory computer- readable medium stores program instructions that, when executed by an apparatus, cause the apparatus to perform at least of any one of the methods described above.

BRIEF DESCRIPTION OF THE DRAWINGS

[0065] For a proper understanding of example embodiments, reference should be made to the accompanying drawings, wherein:

[0066] FIG. 1 illustrates an example of a UE acquiring capacity cell information via an anchor cell;

[0067] FIGs. 2-4 illustrate an example of signaling diagrams according to some example embodiments;

[0068] FIGs. 5-10 illustrate an example of flow diagrams of a method that may be performed by a user equipment according to certain example embodiments;

[0069] FIG. 11 illustrates an example of a flow diagram of a method that may be performed by an anchor cell, according to some example embodiments;

[0070] FIG. 12 illustrates an example of a flow diagram of a method that may be performed by a capacity cell, according to various example embodiments;

[0071] FIG. 13 illustrates an example of various network devices according to some example embodiments; and

[0072] FIG. 14 illustrates an example of a 5G network and system architecture according to various example embodiments. DETAILED DESCRIPTION

[0073] It will be readily understood that the components of certain example embodiments, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of some example embodiments of systems, methods, apparatuses, and computer program products for minimizing lost paging messages during user equipment (UE) acquisition of SIB1 on demand of a capacity cell is not intended to limit the scope of certain example embodiments, but is instead representative of selected example embodiments.

[0074] As noted above, various techniques exist to minimize network energy consumption by reducing the number of transmissions from the perspective of the network. Because networks may have extended periods of time with low load, opportunities exist to save additional energy, for example, by reducing the transmission of always on periodic signals (e.g., system information block 1 (SIB1)).

[0075] As used throughout this discussion, “anchor cell” may refer to a cell through which information of another cell may be provided to a UE. Anchor cells may be active for longer periods of time than the capacity cells that they anchor. There may be more than one anchor cell for a capacity cell, and an anchor cell can also function as a capacity cell.

[0076] Similarly, “capacity cell” may refer to a cell which can leverage deeper sleep states, where one of these states may include suspending SIB1 transmissions, and enabling SIB1 on demand. A capacity cell may require an anchor cell to assist with providing its acquisition or configuration information. As noted above, an anchor cell can also function as a capacity cell, and thus a given capacity cell may function as an anchor cell for other cells.

[0077] When a cell, which may be a capacity cell, enters an energy saving mode by implementing energy saving measures (e.g., suspending transmission of SIB1, enabling SIB1 on demand), a UE may determine to acquire the SIB1 for the capacity cell while in an energy saving state. For this purpose the UE may cooperate with an anchor cell. Anchor cells may have larger coverage and/or provide UEs with information on how to access capacity cells, which may enter energy saving modes and/or suspend transmission of SIB1. Using the anchor cells, a UE may learn how to acquire the SIB1 for the capacity cell.

[0078] As shown in FIG. 1, capacity cell wake-up signal (WUS) configuration and SIB1 timing configuration, as well as other information, may be transmitted by a capacity cell to the anchor cell, and then acquired by a UE from the anchor cell. The UE may then use the capacity cell WUS configuration to transmit a WUS to the capacity cell, which then initiates SIB1 transmission based on receiving the WUS. The UE may then acquire the capacity cell SIB 1.

[0079] When performing this procedure, however, there may be an interval between the sending of the WUS by the UE and the transmission and acquisition of the capacity cell SIB1 by the UE. During this interval the UE may not be able to decode paging messages sent on the capacity cell, and if not synchronized to the anchor cell may also not be able to decode paging messages sent on the anchor cell. Potential factors which may increase such interval may include one or more of: the UE waiting for a WUS transmission opportunity, which may be infrequent because the capacity cell is in energy saving state; the transmission of the WUS; the network decoding the WUS, with a probability of failure; a wait time of the next SIB1 transmission occasion; and the UE decoding the SIB1 once acquired.

[0080] Paging procedures which are not successful can lead to re-paging attempts on larger geographical areas, e.g., a higher number of nodes could be transmitting a paging message leading to higher energy consumption (so-called paging escalation within a tracking area). Furthermore, loss of paging can lead to degraded end user experience. For example, loss of voice call paging can lead the calling party to experience higher call set up times.

[0081] There is a need, therefore, for an efficient technique for a UE determined to reselect to a capacity cell which is in an energy saving state, including where the capacity cell has enabled SIB1 on demand, to acquire the SIB1 of the capacity cell while minimizing lost paging messages.

[0082] Certain example embodiments described herein may have various benefits and/or advantages to overcome the disadvantages described above. For example, certain example embodiments may provide an efficient technique to acquire the SIB1 of a capacity cell which is in an energy saving state, including where the capacity cell has enabled SIB1 on demand, to acquire the SIB1 of the capacity cell while minimizing lost paging messages. [0083] As explained in more detail below, some example embodiments involve the UE camping on an anchor cell and performing cell-reselection measurements. In general, various example embodiments may involve a capacity cell transmitting to or otherwise sharing with the anchor cell the WUS configuration and SIB1 transmission information of the capacity cell. In some example embodiments this can be facilitated by an Xn NG RAN Configuration Update procedure. [0084] In some example embodiments, the UE acquires the WUS configuration and the SIB1 transmission information of the capacity cell from the anchor cell. In some embodiments the SIB1 timing information defines a timing of SIB1 on-demand (OD) transmissions of the capacity cell (e.g. the SIB1 OD transmission timing in response to receiving a WUS on the capacity cell). In different embodiments, SIB1 OD may have different transmission periodicities from periodic always-on SIB1 transmissions. Providing a UE with the SIB1 OD transmission timing may allow for efficient capacity cell measurements and SIB1 acquisition. In some embodiments, a timing of the SIB1 OD transmission window may be defined based on the WUS transmission occasion or SSB transmission of the capacity cell. This optional information may further inform the UE if repetitions of the SIB1 OD will occur within a configured SI window for transmission of SIB1 OD. The SIB1 transmission information may also define an expected scheduling delay between the WUS transmission and a first SIB1 transmission. The UE may take the SIB1 OD transmission information into account to determine whether there will be a collision between paging monitoring on the anchor cell and the SIB1 on-demand procedure on the capacity cell.

[0085] In some example embodiments, the UE determines if its paging occasion on the anchor cell (or, optionally, other cells for MU-SIM cases) collides with a WUS transmission occasion on the measured SIB1 OD capacity cell. This determination may be based on e.g, ensuring that any WUS transmission on the SIB1 OD cell concludes (or starts) a predefined interval prior to (or after) the UE’s paging occasion on the anchor cell. The predefined interval may be any suitable range, and in some embodiments is based on predefined properties and/or characteristics of one or more of the UE, the anchor cell, the capacity cell, and other network entities and infrastructure. For example, in some embodiments the predefined interval is based on predefined switching parameters or capabilities of the UE. In some embodiments, the predefined interval is self-determined by the UE based on an intra/inter frequency relationship between the cells or specified by 3 GPP/ configured by the network. In some embodiments, the WUS transmission may include repetitions and transmissions which are distributed over multiple slots (e.g due to Time Division Duplex (TDD)).

[0086] In some example embodiments, the UE may additionally acquire from the anchor cell a threshold (WUS Threshold) which determines when it should prioritize transmission of WUS for SIB1 OD and acquisition of SIB1 OD over paging. This threshold could be based on the serving cell’s (anchor cell) measured RSRP/RSRQ.

[0087] In some example embodiments, the UE measures a SIB1 OD capacity cell and returns to a serving cell even if cell re-selection criterion is met. In such case, the UE may wait until it has acquired the capacity cell’s SIB1 before reselecting to the cell. In some example embodiments, the UE continues to camp on the anchor cell and considers the capacity cell as temporarily barred until the capacity cell SIB1 is acquired.

[0088] In some example embodiments, the UE may transmit the capacity cell WUS based on certain conditions. For example, in some embodiments, even if a UE paging occasion collides with a WUS transmission occasion of the capacity cell, the UE may nevertheless transmit the WUS on the capacity cell if the anchor cell RSRP or RSRQ is below, or no greater than, a threshold (WUS Threshold). In some embodiments, this threshold (WUS Threshold) of the anchor cell can be configured by an original equipment manufacturer.

[0089] In some example embodiments where the UE supports paging early indication (PEI), the UE may transmit the WUS on the capacity cell even when a collision is determined to exist and the anchor cell RSRP/RSRQ is not below the configured threshold when the PEI does not provide UE a notification in the upcoming paging occasion, or the PEI does not specify a subgroup containing the UE.

[0090] In some example embodiments, when the UE transmits the WUS to the capacity cell, the UE may then determine whether it should return (resynchronize) to the anchor cell. In some embodiments, this determination is based on a start of a next SIB1 OD transmission window of the capacity cell, and a next paging occasion of the anchor cell to be monitored. In some embodiments, the UE monitors the capacity cell for SIB1 acquisition and if SIB1 is acquired and cell-reselection criterion is met, the UE performs cell reselection. In some embodiments, the UE employs SIB1 OD timing and repetition configuration to minimize measurements of capacity cells in search of SIB1 and to avoid/minimize collisions of OD SIB1 acquisition and paging occasions.

[0091] Although the procedures described herein involve the acquisition of SIB1 OD, they can be employed, mutatis mutandis, for acquisition of other SI messages of the capacity cell and/or MIB.

[0092] FIGs. 2 through 4 illustrate example signalling diagrams depicting a UE acquiring a capacity cell SIB1 when the capacity cell is in an energy saving state (or sleep state, used interchangeably herein) and has enabled SIB1 on demand. The signalling diagrams illustrate parts of a whole signalling diagram which, when considered collectively, illustrate the disclosed technique. In particular, FIG. 2 illustrates a partial signalling diagram 200 depicting a first part of the technique, and FIG. 4 illustrates a partial signalling diagram 400 depicting a final part of the technique. FIGs. 3 A through 3D illustrate partial signalling diagrams 310, 320, 330, 340 depicting parts of the technique intermediate to partial signalling diagrams 200, 400 where multiple alternative arrangements of partial signalling diagrams 310, 320, 330, 340 are possible. UE 220 may be similar to or an instance of UE 1320, anchor cell 230 may be similar to or an instance of NE 1310, and capacity cell 240 may be similar to or an instance of NE 1310, as illustrated in FIG. 13 and described below, according to certain example embodiments.

[0093] At operation 201, the capacity cell 240 may enable SIB1 on demand for network energy savings.

[0094] At operation 202, the capacity cell 240 may transmit to the anchor cell 230 a WUS configuration of the capacity cell 240. At operation 203, the capacity cell 240 may transmit to the anchor cell 230 SIB1 transmission timing information of the capacity cell 240. In some embodiments, operations 202 and 203 are two separate operations, and in some other embodiments, operations 202 and 203 are a single operation.

[0095] At operation 204, the anchor cell 230 may transmit to the UE 220 the WUS configuration of the capacity cell 240. At operation 205, the anchor cell 230 may transmit to the UE 220 the SIB1 transmission timing information of the capacity cell 240. In some embodiments, operations 204 and 205 are two separate operations, and in some other embodiments, operations 204 and 205 are a single operation.

[0096] At operation 206, the capacity cell 240 may enter an energy saving state, which in some example embodiments is a sleep state, and activate SIB1 on demand.

[0097] At operation 207, the UE 220 may camp on the anchor cell 230.

[0098] At operation 208, the UE 220 may measure the capacity cell 240, and determine that the capacity cell 240 has activated SIB1 on demand. The UE 220 may also determine that the capacity cell 240 fulfills cell reselection criteria.

[0099] At operation 209, the UE may re-synchronize to the anchor cell 209.

[0100] Arrows 210 illustrate that the full timing diagram continues at one of FIGs.

3 A through 3D. [0101] As noted above, FIGs. 3A through 3D illustrate partial signalling diagrams 310, 320, 330, 340 depicting parts of the technique intermediate to partial signalling diagrams 200, 400 where multiple alternative arrangements of partial signalling diagrams 310, 320, 330, 340 are possible. Regardless of the particular alternative, arrows 311, 321, 331, 341 illustrate continuation from a previous portion of the full signalling diagram, and arrows 312, 322, 332, 342 illustrate continuation to a next portion of the full signalling diagram, as described below.

[0102] Turning first to FIG. 3 A, partial signalling diagram 310 may continue from partial signalling diagram 200 as illustrated by arrows 311. At operation 313, the UE 220 may determine based at least in part on the received WUS configuration of the capacity cell 240 a WUS occasion of the capacity cell 240 free from collision with any paging occasion of the anchor cell 230. Arrows 312 illustrate that the full timing diagram continues at a next portion of the full signalling diagram, which may be partial signalling diagram 400 shown in FIG. 4. For better comprehension, partial signalling diagram 400 is now described before a description of partial signalling diagrams 320, 330, 340 shown in FIGs. 3B through 3D.

[0103] Thus, turning to FIG. 4, partial signalling diagram 400 continues from a preceding portion of the full signalling diagram, as shown by arrows 401. In one alternative, continuning from the immediately preceding paragraph, the partial signalling diagram 400 continues from partial signalling diagram 310 shown in FIG. 3 A.

[0104] At operation 402, the UE 220 may transmit to the capacity cell 240 a WUS based at least in part on the received WUS configuration of the capacity cell 240.

[0105] At operation 403, the capacity cell 240 may exit sleep state.

[0106] At operation 404, the capacity cell 240 may transmit its SIB1 to the UE 220, which may be by broadcasting the SIB1, in accordance with the SIB1 transmission timing information.

[0107] At operation 405, the UE 220 may determine an instance of SIB1 transmission timing, which may be a SIB1 transmission window, free from collision with any paging occasion of the anchor cell 230, based at least in part on the received SIB1 timing information.

[0108] At operation 406, the UE 220 may acquire the SIB 1 of the capacity cell 240, which may be during the SIB1 transmission window free from collision with any paging occasion of the anchor cell 230 previously determined. [0109] At operation 407, the UE 220 may perform cell a re-selection procedure to re-select to the capacity cell 240 based at least in part on the received SIB1 of the capacity cell 240.

[0110] As noted above, FIGs. 3A through 3D illustrate partial signalling diagrams 310, 320, 330, 340 depicting parts of the technique intermediate to partial signalling diagrams 200, 400 where multiple alternative arrangements of partial signalling diagrams 310, 320, 330, 340 are possible. A first such alternative is described above. Further such alternatives are now described.

[0111] Turning to FIG. 3B, partial signalling diagram 320 may continue from partial signalling diagram 200 as illustrated by arrows 321. At operation 323, the UE 220 may determine based at least in part on the received WUS configuration of the capacity cell 240 a collision of a WUS occasion of the capacity cell 240 with a paging occasion of the anchor cell 230. Arrows 322 illustrate that the full timing diagram continues at a next portion of the full signalling diagram.

[0112] Turning to FIG. 3C, partial signalling diagram 330 continues from a preceding portion of the full signalling diagram as shown by arrows 331. In one alternative, partial signalling diagram 330 continues from partial signalling diagram 200. In another alternative, partial signalling diagram 330 continues from partial signalling diagram 320.

[0113] At operation 333, the UE 220 may monitor a PEI occasion on the anchor cell 230.

[0114] At operation 334, the UE 220 may either detect no PEI during a WUS occasion of the capacity cell 240, or may detect a PEI during the WUS occasion of the capacity cell 240 which does not indicate a subgroup containing the UE 220. Arrows 332 illustrate that the full timing diagram continues at a next portion of the full signalling diagram, which may be partial signalling diagram 400 shown in FIG. 4, described above.

[0115] Turning to FIG. 3D, partial signalling diagram 340 continues from a preceding portion of the full signalling diagram as shown by arrows 341. In one alternative, partial signalling diagram 330 continues from partial signalling diagram 200. In another alternative, partial signalling diagram 330 continues from partial signalling diagram 320. In another alternative, partial signalling diagram 330 continues from partial signalling diagram 330.

[0116] At operation 343, the UE 220 determines that a measured RSRP and/or RSRQ of the anchor cell 230 is below a predetermined threshold. Arrows 342 indicate that the full timing diagram continues at a next portion of the full signalling diagram, which may be partial signalling diagram 400 shown in FIG. 4, described above.

[0117] FIG. 5 illustrates an example of a flow diagram of a method 500 that may be performed by a UE, which may be similar to or an instance of UE 1320 illustrated in FIG. 13, according to various example embodiments.

[0118] At step 501, the method 500 may include camping on an anchor cell, which may be similar to or an instance of NE 1310 illustrated in FIG. 13, according to various example embodiments.

[0119] At step 502, the method 500 may further include receiving a WUS configuration and SIB 1 timing information of a capacity cell, which may be similar to or an instance of NE 1310 illustrated in FIG. 13, from the anchor cell.

[0120] At step 503, the method 500 may further include measuring the capacity cell and determining that it meets cell reselection criteria.

[0121] At step 504, the method 500 may further include resynchronizing to the anchor cell.

[0122] At step 505, the method 500 may further include determining to transmit a WUS to the capacity cell. Alternatives for this step are further described below, following description of method 500.

[0123] At step 506, the method 500 may further include resynchronizing to the capacity cell.

[0124] At step 507, the method 500 may further include transmitting the WUS to the capacity cell.

[0125] At step 508, the method 500 may further include determining to acquire the SIB1 of the capacity cell. Alternatives for this step are further described below, following description of method 500.

[0126] At step 509, the method 500 may further include acquiring the SIB1 of the capacity cell.

[0127] At step 510, the method 500 may further include determining re-selection to the capacity cell.

[0128] FIGs. 6 through 9 illustrate examples of flow diagrams representing nonlimiting alternative methods for performing step 505 in method 500, of determining to transmit a WUS to the capacity cell. [0129] Thus, FIG. 6 illustrates an alternative method 600 for performing step 505 in method 500, of determining to transmit a WUS to the capacity cell. The method 600 enters at 601. At decision 602 the method determines whether a next WUS occasion is free from collision with any paging occasion of the anchor cell. At branch ‘yes’ 603, the method 600 returns at 604 to method 500. At branch ‘no’ 605, the method 600 loops back to decision 602. In other words, in alternative method 600, step 505 involves determining to transmit a WUS to the capacity cell when a next WUS occasion is free from collision with any paging occasion of the anchor cell, and waiting until this condition is met.

[0130] FIG. 7 illustrates an alternative method 700 for performing step 505 in method 500, of determining to transmit a WUS to the capacity cell. The method 700 enters at 701. At decision 702 the method determines whether a next WUS occasion is free from collision with any paging occasion of the anchor cell. At branch ‘yes’ 703, the method 700 returns at 704 to method 500. At branch ‘no’ 705, the method 700 continues to step 706 of monitoring a PEI occasion on the anchor cell. At decision 707, the method 700 determines either that a PEI indicates no paging occasion of the anchor cell during a capacity cell WUS occasion, or that the paging occasion is free from a subgroup identifying the UE. At branch ‘yes’ 708, the method 700 returns at 704 to method 500. At branch ‘no’ 709, the method 700 continues to decision 710 of determining whether a measured RSRP/RSRQ on the anchor cell is below a predetermined threshold. At branch ‘yes’ 711, the method 700 returns at 704 to method 500. At branch ‘no’ 712, the method 700 loops back to decision 702. In other words, in alternative method 700, step 505 involves determining to transmit a WUS to the capacity cell when a next WUS occasion is free from collision with any paging occasion of the anchor cell, or when a PEI indicates no paging occasion of the anchor cell during the next WUS occasion or a paging occasion free from a subgroup containing the UE, or when a measured RSRP/RSRQ on the anchor cell is below a predetermined threshold.

[0131] FIG. 8 illustrates an alternative method 800 for performing step 505 in method 500, of determining to transmit a WUS to the capacity cell. The method 800 enters at 801. At step 802 the method 800 monitors a PEI occasion on the anchor cell. At decision 803, the method 800 determines either that a PEI indicates no paging occasion of the anchor cell during a capacity cell WUS occasion, or that the paging occasion is free from a subgroup identifying the UE. At branch ‘yes’ 804, the method 800 returns at 805 to method 500. At branch ‘no’ 806, the method 800 continues to decision 807 of determining whether a measured RSRP/RSRQ on the anchor cell is below a predetermined threshold. At branch ‘yes’ 808, the method 800 returns at 805 to method 500. At branch ‘no’ 809, the method 800 loops back to decision 802. In other words, alternative method 800 is similar to alternative method 700, except that it omits a step such as decision 702 of first determining whether a next WUS occasion is free from collision with any paging occasion of the anchor cell.

[0132] FIG. 9 illustrates an alternative method 900 for performing step 505 in method 500, of determining to transmit a WUS to the capacity cell. The method 900 enters at 901. At decision 902 the method determines whether a next WUS occasion is free from collision with any paging occasion of the anchor cell. At branch ‘yes’ 903, the method 900 returns at 904 to method 500. At branch ‘no’ 905, the method 900 continues to decision 906 of determining whether a measured RSRP/RSRQ on the anchor cell is below a predetermined threshold. At branch ‘yes’ 907, the method 900 returns at 904 to method 500. At branch ‘no’ 908, the method 900 loops back to decision 902. In other words, alternative method 900 is similar to alternative method 700, except that it omits step 706 and decision 707 involving monitoring a PEI of the anchor cell.

[0133] Further alternatives for performance of step 505 of method 500 are both possible and contemplated. For example, in method 700, the order of, first, decision 702, second, step 706 and decision 707, and third, decision 710, may be rearranged. For example, in some embodiments, decision 710 may come before decision 702, such that it is first determined whether a measured RSRP/RSRQ on the anchor cell is below a predetermined threshold, before it is determined whether a next WUS occasion is free from collision with any paging occasion of the anchor cell, and/or before it is determined either that PEI indicates no paging occasion of the anchor cell during a capacity cell WUS occasion, or that the paging occasion is free from a subgroup identifying the UE.

[0134] As described above, step 508 of method 500 may include determining to acquire the SIB1 of the capacity cell. A method for performing this step is now described.

[0135] Thus, FIG. 10 illustrates an alternative method 1000 for performing step 508 in method 500, of determining to acquire the SIB1 of the capacity cell. The method 1000 enters at 1001. At decision 1002, the method 1000 determines whether a measured RSRP/RSRQ on the anchor cell is below a predetermined threshold. At branch ‘yes’ 1003, the method 1000 returns at 1004 to method 500. At branch ‘no’ 1005, the the method 1000 continues to decision 1006 where the method determines whether a next SIB1 transmission window is before and free from collision with any paging occasion of the anchor cell. At branch ‘yes’ 1007, the method 1000 returns at 1004 to method 500. At branch ‘no’ 1008, the method continues to step 1009 of resynchronizing to the anchor cell. The method then continues to decision 1010 of determining whether a next SIB1 transmission window is free from collision with any paging occasion of the anchor cell. At branch ‘yes’ 1011, the method continues to step 1012 of resynchronizing to the capacity cell, and then returns at 1004 to method 500. At branch ‘no’ 1013, the method loops back to decision 1007. In some embodiments, decision 1002 and related branches 1003 and 1005 are omitted. In some embodiments, decisions 1002 and 1006 are reversed in order. In other words, and with reference to FIG. 5, if after having resynchronized to the capacity cell at step 506, and having transmitted the WUS to the capacity cell at step 507, the method 1000 determines that the next SIB1 window is before and free from collision with any paging occasion of the anchor cell, then the method 500 may proceed to step 509 of acquiring the capacity cell SIB1 while remaining synchronized with the capacity cell. In some embodiments, the method 500 may proceed to step 509 of acquiring the capacity cell SIB1 while remaining synchronized with the capacity cell if the measured RSRP/RSRQ on the anchor cell is below a predetermined threshold, and in some embodiments may do so without first determining whether the next SIB1 window is before and free from collision with any paging occasion of the anchor cell. On the other hand, if the next SIB1 window free from collision with any anchor cell paging occasion follows the next anchor cell paging occasion, then method may first resynchronize to the anchor cell at step 1006, and then resynchronizes back to the capacity cell at step 1009 in order to acquire the capacity cell SIB1 at step 509 once it is determined at decision 1007 that a next SIB1 transmission windows is free from collision with any anchor cell paging occasion.

[0136] FIG. 11 illustrates an example of a flow diagram of a method 1100 that may be performed by anchor cell, which may be similar to or an instance of NE 1310 illustrated in FIG. 13, according to various example embodiments.

[0137] At step 1101, the method 1100 may include receiving a WUS configuration and SIB1 transmission timing information, which may include SIB1 tranmission window information, from a capacity cell, which may be similar to or an instance of NE 1310 illustrated in FIG. 13, according to various example embodiments.

[0138] At step 1102, the method 1100 may further include transmitting the received WUS configuration and SIB1 transmission timing information of the capacity cell to a UE, which may be similar to or an instance of UE 1320 illustrated in FIG. 13, according to various example embodiments. [0139] FIG. 12 illustrates an example of a flow diagram of a method 1100 that may be performed by a capacity cell, which may be similar to or an instance of NE 1310 illustrated in FIG. 13, according to various example embodiments.

[0140] At step 1201, the method 1200 may include enabling SIB1 on demand.

[0141] At step 1202, the method 1200 may further include transmitting WUS configuration and SIB1 transmission timing information, which may include SIB1 tranmission window information, of the capacity cell to an anchor cell, which may be similar to or an instance of NE 1310 illustrated in FIG. 13, according to various example embodiments.

[0142] At step 1203, the method 1200 may further include entering a energy saving state, such as a sleep state.

[0143] At step 1204, the method 1200 may further include receiving a WUS from a UE, which may be similar to or an instance of UE 1320 illustrated in FIG. 13, according to various example embodiments.

[0144] At step 1205, the method 1200 may further include existing the energy saving state.

[0145] At step 1206, the method 1200 may further include transmitting the SIB1 of the capacity cell to the UE, which may be by broadcasting the SIB1.

[0146] FIG. 13 illustrates an example of a system 1300 according to certain example embodiments. In one example embodiment, a system 1300 may include multiple devices, such as, for example, multiple instances of network equipment (NE) 1310 and/or multiple instances of user equipment (UE) 1320. As discussed above, in some embodiments UE 220 is similar to or an instance of UE 1320, anchor cell 230 is similar to or an instance of NE 1310, and capacity cell 240 is similar to or an instance of NE 1310.

[0147] NE 1310 may be one or more of a base station (e.g., 3GUMTS NodeB, 4GLTE Evolved NodeB, or 5G NR Next Generation NodeB), a serving gateway, a server, and/or any other access node or combination thereof.

[0148] NE 1310 may further include at least one gNB -centralized unit (CU), which may be associated with at least one gNB -distributed unit (DU). The at least one gNB-CU and the at least one gNB-DU may be in communication via at least one Fl interface, at least one X_n-C interface, and/or at least one NG interface via a 5^th generation core (5GC).

[0149] UE 1320 may include one or more of a mobile device, such as a mobile phone, smart phone, personal digital assistant (PDA), tablet, or portable media player, digital camera, pocket video camera, video game console, navigation unit, such as a global positioning system (GPS) device, desktop or laptop computer, single-location device, such as a sensor or smart meter, or any combination thereof. Furthermore, NE 1310 and/or UE 1320 may be one or more of a citizens broadband radio service device (CBSD).

[0150] NE 1310 and/or UE 1320 may include at least one processor, respectively indicated as 1311 and 1321. Processors 1311 and 1321 may be embodied by any computational or data processing device, such as a central processing unit (CPU), application specific integrated circuit (ASIC), or comparable device. The processors may be implemented as a single controller, or a plurality of controllers or processors.

[0151] At least one memory may be provided in one or more of the devices, as indicated at 1312 and 1322. The memory may be fixed or removable. The memory may include computer program instructions or computer code contained therein. Memories 1312 and 1322 may independently be any suitable storage device, such as a non-transitory computer-readable medium. The term “non-transitory,” as used herein, may correspond to a limitation of the medium itself (z.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., random access memory (RAM) vs. read-only memory (ROM)). A hard disk drive (HDD), random access memory (RAM), flash memory, or other suitable memory may be used. The memories may be combined on a single integrated circuit as the processor, or may be separate from the one or more processors. Furthermore, the computer program instructions stored in the memory, and which may be processed by the processors, may be any suitable form of computer program code, for example, a compiled or interpreted computer program written in any suitable programming language.

[0152] Processors 1311 and 1321, memories 1312 and 1322, and any subset thereof, may be configured to provide means corresponding to the various blocks of FIGs. 2-12. Although not shown, the devices may also include positioning hardware, such as GPS or micro electrical mechanical system (MEMS) hardware, which may be used to determine a location of the device. Other sensors are also permitted, and may be configured to determine location, elevation, velocity, orientation, and so forth, such as barometers, compasses, and the like.

[0153] As shown in FIG. 13, transceivers 1313 and 1323 may be provided, and one or more devices may also include at least one antenna, respectively illustrated as 1314 and 1324. The device may have many antennas, such as an array of antennas configured for multiple input multiple output (MIMO) communications, or multiple antennas for multiple RATs. Other configurations of these devices, for example, may be provided. Transceivers 1313 and 1323 may be a transmitter, a receiver, both a transmitter and a receiver, or a unit or device that may be configured both for transmission and reception.

[0154] The memory and the computer program instructions may be configured, with the processor for the particular device, to cause a hardware apparatus, such as UE, to perform any of the processes described above (z.e., FIGs. 2-12). Therefore, in certain example embodiments, a non-transitory computer-readable medium may be encoded with computer instructions that, when executed in hardware, perform a process such as one of the processes described herein. Alternatively, certain example embodiments may be performed entirely in hardware.

[0155] In certain example embodiments, an apparatus may include circuitry configured to perform any of the processes or functions illustrated in FIGs. 2-12. As used in this application, the term “circuitry” may refer to one or more or all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry), (b) combinations of hardware circuits and software, such as (as applicable):

(i) a combination of analog and/or digital hardware circuit(s) with software/firmware and

(ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions), and (c) hardware circuit(s) and or processor(s), such as a microprocessor s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation. This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

[0156] FIG. 14 illustrates an example of a 5G network and system architecture according to certain example embodiments. Shown are multiple network functions that may be implemented as software operating as part of a network device or dedicated hardware, as a network device itself or dedicated hardware, or as a virtual function operating as a network device or dedicated hardware. The NE and UE illustrated in FIG. 14 may be similar to NE 1310 and UE 1320, respectively. The user plane function (UPF) may provide services such as intra- RAT and inter-RAT mobility, routing and forwarding of data packets, inspection of packets, user plane quality of service (QoS) processing, buffering of downlink packets, and/or triggering of downlink data notifications. The application function (AF) may primarily interface with the core network to facilitate application usage of traffic routing and interact with the policy framework.

[0157] According to certain example embodiments, processors 1311 and 1321, and memories 1312 and 1322, may be included in or may form a part of processing circuitry or control circuitry. In addition, in some example embodiments, transceivers 1313 and 1323 may be included in or may form a part of transceiving circuitry.

[0158] In some example embodiments, an apparatus (e.g., NE 1310 and/or UE 1320) may include means for performing a method, a process, or any of the variants discussed herein. Examples of the means may include one or more processors, memory, controllers, transmitters, receivers, and/or computer program code for causing the performance of the operations.

[0159] So that the present disclosure may be more readily understood, certain terms are defined. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the disclosed subject-matter pertain. While many methods and materials similar, modified, or equivalent to those described herein can be used in the practice of the embodiments of the present disclosure without undue experimentation, the preferred materials and methods are described herein.

[0160] All terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting in any manner or scope. For example, as used in this specification and the appended claims, the singular forms "a," "an" and "the" can include plural referents unless the content clearly indicates otherwise.

[0161] While the disclosed subject-matter may be embodied in many different forms, there are described in detail herein specific embodiments. The present disclosure is an exemplification of the principles of the disclosed subject-matter and is not intended to limit the disclosed subject-matter to the particular embodiments illustrated. Furthermore, the disclosed subject-matter encompasses any possible combination of some or all of the various embodiments mentioned herein. In addition the disclosed subject-matter encompasses any possible combination that also specifically excludes any one or some of the various embodiments mentioned herein.

[0162] The features, structures, or characteristics of example embodiments described throughout this specification may be combined in any suitable manner in one or more example embodiments. For example, the usage of the phrases “various embodiments,” “certain embodiments,” “some embodiments,” or other similar language throughout this specification refers to the fact that a particular feature, structure, or characteristic described in connection with an example embodiment may be included in at least one example embodiment. Thus, appearances of the phrases “in various embodiments,” “in certain embodiments,” “in some embodiments,” or other similar language throughout this specification does not necessarily all refer to the same group of example embodiments, and the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. [0163] Some embodiments of the disclosed subject-matter are described herein using the auxiliary verb “may”. When used herein, unless required otherwise by the context of usage, the auxiliary verb “may” designates an embodiment of the disclosed subject-matter which possesses the addressed object without requiring necessarily that any other embodiment of the disclosed subject-matter possesses the addressed object. Thus, a statement such as “X may include Y” indicates that the disclosed subject-matter includes embodiments where X includes Y, without requiring that all disclosed embodiments include Y, and without excluding any other embodiments which do not include Y.

[0164] Numeric ranges recited within the specification are inclusive of the numbers defining the range and include each integer within the defined range. Throughout this disclosure, various aspects of embodiments are presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the embodiments. Accordingly, the description of a range should be considered to have specifically disclosed all the possible sub-ranges, fractions, and individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6, and decimals and fractions, for example, 1.2, 3.8, P , and 4³/4. This applies regardless of the breadth of the range. [0165] The terms “about” or “approximately” as used herein refer to variation in the numerical quantity that can occur, for example, through typical measuring techniques and equipment, with respect to any quantifiable variable, including, but not limited to, mass, volume, time, distance, voltage, and current. The terms “about” and “approximately” also encompass these variations. Expressions which combine the terms “about” or “approximately” with one or more bounds of a range refer to a union of the bound modified by the term “about” or “approximately” as described above, and the range having the unmodified bound. Thus, for example, the expression “at least about X” means the union of “at least X” and “about X”. Similarly, “at most about Y” means the union of “at most Y” and “about Y”.

[0166] As used herein, “at least one of the following: <a list of two or more elements>” and “at least one of <a list of two or more elements>” and similar wording, where the list of two or more elements are joined by “and” or “or,” mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.

[0167] The phrase "and/or," as used herein in the specification and in the claims, should be understood to mean "either or both" of the elements so conjoined, z.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Multiple elements listed with "and/or" should be construed in the same fashion, z.e., "one or more" of the elements so conjoined. Other elements may optionally be present other than the elements specifically identified by the "and/or" clause, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, a reference to "A and/or B", when used in conjunction with open-ended language such as "comprising" can refer, in one embodiment, to A only (optionally including elements other than B); in another embodiment, to B only (optionally including elements other than A); in yet another embodiment, to both A and B (optionally including other elements); etc.

[0168] As used herein in the specification and in the claims, "or" should be understood to have the same meaning as "and/or" as defined above. For example, when separating items in a list, "or" or "and/or" shall be interpreted as being inclusive, z.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as "only one of’ or "exactly one of', or when used in the claims, "consisting of' will refer to the inclusion of exactly one element of a number or list of elements. In general, the term "or" as used herein shall only be interpreted as indicating exclusive alternatives (i.e. "one or the other but not both") when preceded by terms of exclusivity, such as "either", "one of, "only one of, or "exactly one of. "Consisting essentially of, when used in the claims, shall have its ordinary meaning as used in the field of patent law.

[0169] Additionally, if desired, the different functions or procedures discussed above may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the described functions or procedures may be optional or may be combined. As such, the description above should be considered as illustrative of the principles and teachings of certain example embodiments, and not in limitation thereof.

[0170] One having ordinary skill in the art will readily understand that the example embodiments discussed above may be practiced with procedures in a different order, and/or with hardware elements in configurations which are different than those which are disclosed. Therefore, although some embodiments have been described based upon these example embodiments, it would be apparent to those of skill in the art that certain modifications, variations, and alternative constructions would be apparent, while remaining within the spirit and scope of the example embodiments.

[0171] Partial Glossary

[0172] 3 GPP: 3^rd Generation Partnership Project

[0173] 5G: 5^th Generation

[0174] 5GC: 5^th Generation Core

[0175] 6G: 6^th Generation

[0176] AF: Application Function

[0177] ASIC: Application Specific Integrated Circuit

[0178] CBSD: Citizens Broadband Radio Service Device

[0179] CPU: Central Processing Unit

[0180] CU: Centralized Unit

[0181] DU: Distributed Unit

[0182] eMBB: Enhanced Mobile Broadband

[0183] eNB: Evolved Node B

[0184] gNB: Next Generation Node B

[0185] GPS: Global Positioning System

[0186] HDD: Hard Disk Drive

[0187] loT : Internet of Things

[0188] LTE: Long-Term Evolution [0189] LTE-A: Long-Term Evolution Advanced

[0190] MEMS: Micro Electrical Mechanical System

[0191] MIB: Master Information Block

[0192] MIMO: Multiple Input Multiple Output

[0193] MU-SIM: Multi-SIM

[0194] mMTC: Massive Machine Type Communication

[0195] NE: Network Entity

[0196] NG: Next Generation

[0197] NG-eNB: Next Generation Evolved Node B

[0198] NG-RAN: Next Generation Radio Access Network

[0199] NR: New Radio

[0200] O&M: Operation and Maintenance

[0201] PDA: Personal Digital Assistance

[0202] PDSCH: Physical Downlink Shared Channel

[0203] PEI: Paging Early Indication

[0204] QoS: Quality of Service

[0205] RA: Random Access

[0206] RACH: Random Access Channel

[0207] RAM: Random Access Memory

[0208] RAN: Radio Access Network

[0209] RAR: Random Access Response

[0210] RAT: Radio Access Technology

[0211] RF: Radio Frequency

[0212] ROM: Read-Only Memory

[0213] RSRP: Reference Signal Received Power

[0214] RSRQ: Reference Signal Received Quality

[0215] SI: System Information

[0216] SIB: System Information Block

[0217] SSB: Synchronization Signal Block

[0218] TDD: Time Division Duplex

[0219] UE: User Equipment

[0220] UMTS: Universal Mobile Telecommunications System

[0221] UPF : User Plane Function [0222] URLLC: Ultra-Reliable and Low-Latency Communication

[0223] UTRAN: Universal Mobile Telecommunications System Terrestrial Radio

Access Network

[0224] WUS: Wake Up Signal

Claims

WE CLAIM:

1. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least: to receive a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information of a capacity cell from an anchor cell; to determine a WUS transmission condition for transmitting the WUS to the capacity cell; and responsive to determining the WUS transmission condition, to transmit a WUS to the capacity cell.

2. The apparatus of claim 1, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition by determining based on the WUS configuration a next WUS occasion of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected WUS occasion; and to transmit the WUS to the capacity cell during the selected WUS occasion.

3. The apparatus of claim 2, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the selected WUS occasion to be free from collision with any anchor cell paging occasion by determining a WUS occasion spacing between the selected WUS occasion and the anchor cell paging occasion to be at least a predetermined minimum WUS occasion spacing.

4. The apparatus of claim 2 or 3, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition by: receiving a paging early indication (PEI) of the anchor cell; and determining the WUS transmission condition based on the PEI.

5. The apparatus of claim 4, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition based on the PEI by determining that the PEI indicates no anchor cell paging occasion of the anchor cell during the selected WUS occasion of the capacity cell.

6. The apparatus of claim 4 or 5, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition based on the PEI by determining that the PEI indicates an anchor cell paging occasion of the anchor cell during the selected WUS occasion that is free from a subgroup containing the apparatus.

7. The apparatus of any one of claims 1 to 6, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition by determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

8. The apparatus of any one of claims 1 to 7, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the WUS transmission condition while camping on the anchor cell.

9. The apparatus of any one of claims 1 to 8, wherein the instructions, when executed by the at least one processor, further cause the apparatus at least: prior to determining the WUS transmission condition, to measure the capacity cell and to determine that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled.

10. The apparatus of claim 9, wherein the instructions, when executed by the at least one processor, further cause the apparatus at least: responsive to determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled, to bar reselection of the capacity cell until the capacity cell SIB1 is acquired.

11. The apparatus of any one of claims 1 to 10, wherein the instructions, when executed by the at least one processor, further cause the apparatus at least: after transmitting the WUS to the capacity cell, to determine to acquire a SIB1 from the capacity cell; and responsive thereto, to acquire the SIB1 from the capacity cell.

12. The apparatus of claim 11, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine to acquire the SIB1 from the capacity cell by determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

13. The apparatus of claim 11, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine to acquire the SIB 1 from the capacity cell by determining based on the SIB1 timing information a next SIB1 transmission window of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell as a selected SIB 1 transmission window; and to acquire the SIB1 from the capacity cell during the selected SIB1 transmission window.

14. The apparatus of claim 13, wherein the instructions, when executed by the at least one processor, cause the apparatus at least: to determine the SIB1 transmission window of the capacity cell to be free from collision with any anchor cell paging occasion of the anchor cell by determining a SIB1 transmission window spacing between the selected SIB1 transmission window and any anchor cell paging occasion to be at least a predetermined minimum SIB1 transmission window spacing.

15. The apparatus of claim 13 or 14, wherein the instructions, when executed by the at least one processor, further cause the apparatus at least: after transmitting the WUS to the capacity cell and before acquiring the SIB1 from the capacity cell, to determine that at least one anchor cell paging occasion precedes the selected SIB 1 transmission window, and in response to resynchronize to the anchor cell before all of the at least one anchor cell paging occasion, and then to resynchronize to the capacity cell after all of the at least one anchor cell paging occasion and before the selected SIB1 transmission window.

16. The apparatus of any one of claims 11 to 15, wherein the instructions, when executed by the at least one processor, further cause the apparatus at least: after acquiring the SIB1 from the capacity cell, to perform a cell reselection procedure to determine reselection to the capacity cell.

17. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least: to receive a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information from a capacity cell; and to transmit the WUS configuration and SIB1 timing information of the capacity cell to a user equipment (UE).

18. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least: to enable system information block 1 (SIB1) on demand functionality at a capacity cell; and to transmit wake-up signal (WUS) configuration and SIB1 timing information of the capacity cell to an anchor cell.

19. An apparatus comprising: means for receiving a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information of a capacity cell from an anchor cell; means for determining a WUS transmission condition for transmitting the WUS to the capacity cell; and means for, responsive to determining the WUS transmission condition, transmitting a WUS to the capacity cell.

20. The apparatus of claim 19, wherein: determining the WUS transmission condition comprises determining based on the WUS configuration a next WUS occasion of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected WUS occasion; and transmitting the WUS comprises transmitting the WUS to the capacity cell during the selected WUS occasion.

21. The apparatus of claim 20, wherein: determining the selected WUS occasion to be free from collision with any anchor cell paging occasion comprises determining a WUS occasion spacing between the selected WUS occasion and the anchor cell paging occasion to be at least a predetermined minimum WUS occasion spacing.

22. The apparatus of claim 20 or 21, wherein: determining the WUS transmission condition comprises: receiving a paging early indication (PEI) of the anchor cell; and determining the WUS transmission condition based on the PEI.

23. The apparatus of claim 22, wherein: determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates no anchor cell paging occasion of the anchor cell during the selected WUS occasion of the capacity cell.

24. The apparatus of claim 22 or 23, wherein: determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates an anchor cell paging occasion of the anchor cell during the selected WUS occasion that is free from a subgroup containing the apparatus.

25. The apparatus of any one of claims 19 to 24, wherein: determining the WUS transmission condition comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

26. The apparatus of any one of claims 19 to 25, wherein: the apparatus is operable to determine the WUS transmission condition while the apparatus is camping on the anchor cell.

27. The apparatus of any one of claims 19 to 26, further comprising: means for, prior to determining the WUS transmission condition, measuring the capacity cell and determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled.

28. The apparatus of claim 27, further comprising: means for, responsive to determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled, barring reselection of the capacity cell until the capacity cell SIB1 is acquired.

29. The apparatus of any one of claims 19 to 28, further comprising: means for, after transmitting the WUS to the capacity cell, determining to acquire a SIB1 from the capacity cell, and responsive thereto, acquiring the SIB1 from the capacity cell.

30. The apparatus of claim 29, wherein: determining to acquire the SIB1 from the capacity cell comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

31. The apparatus of claim 29, wherein: determining to acquire the SIB1 from the capacity cell comprises determining based on the SIB1 timing information a next SIB1 transmission window of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell as a selected SIB1 transmission window; and acquiring the SIB1 from the capacity cell comprises acquiring the SIB1 from the capacity cell during the selected SIB1 transmission window.

32. The apparatus of claim 31, wherein: determining the SIB1 transmission window of the capacity cell to be free from collision with any anchor cell paging occasion of the anchor cell comprises determining a SIB1 transmission window spacing between the selected SIB1 transmission window and any anchor cell paging occasion to be at least a predetermined minimum SIB1 transmission window spacing.

33. The apparatus of claim 31 or 32, further comprising: means for, after transmitting the WUS to the capacity cell and before acquiring the SIB1 from the capacity cell, determining that at least one anchor cell paging occasion precedes the selected SIB1 transmission window, and in response resynchronizing to the anchor cell before all of the at least one anchor cell paging occasion, and then resynchronizing to the capacity cell after all of the at least one anchor cell paging occasion and before the selected SIB1 transmission window.

34. The apparatus of any one of claims 29 to 33, further comprising: means for, after acquiring the SIB1 from the capacity cell, performing a cell reselection procedure to determine reselection to the capacity cell.

35. An apparatus comprising: means for receiving a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information from a capacity cell; and means for transmitting the WUS configuration and SIB1 timing information of the capacity cell to a user equipment (UE).

36. An apparatus comprising: means for enabling system information block 1 (SIB1) on demand functionality at a capacity cell; and means for transmitting wake-up signal (WUS) configuration and SIB1 timing information of the capacity cell to an anchor cell.

37. The apparatus of any one of claims 1 to 36, wherein: the SIB1 timing information defines a timing of transmissions of the SIB1 by the capacity cell responsive to receiving a WUS at the capacity cell.

38. The apparatus of claim 37, wherein: the SIB1 timing information defines a periodicity of transmissions of the SIB1 by the capacity cell responsive to receiving the WUS at the capacity cell.

39. The apparatus of claim 37 or 38, wherein: the SIB1 timing information defines a predetermined delay between receiving the WUS at the capacity cell and transmissions of the SIB1 by the capacity cell.

40. A method comprising: receiving a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information of a capacity cell from an anchor cell; determining a WUS transmission condition for transmitting the WUS to the capacity cell; and responsive to determining the WUS transmission condition, transmitting a WUS to the capacity cell.

41. The method of claim 40, wherein: determining the WUS transmission condition comprises determining based on the WUS configuration a next WUS occasion of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected WUS occasion; and transmitting the WUS to the capacity cell comprises transmitting the WUS to the capacity cell during the selected WUS occasion.

42. The method of claim 41, wherein: determining the selected WUS occasion to be free from collision with any anchor cell paging occasion comprises determining a WUS occasion spacing between the selected WUS occasion and the anchor cell paging occasion to be at least a predetermined minimum WUS occasion spacing.

43. The method of claim 41 or 42, wherein: determining the WUS transmission condition comprises: receiving a paging early indication (PEI) of the anchor cell; and determining the WUS transmission condition based on the PEI.

44. The method of claim 43, wherein: determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates no anchor cell paging occasion of the anchor cell during the selected WUS occasion of the capacity cell.

45. The method of claim 43 or 44, wherein: determining the WUS transmission condition based on the PEI comprises determining that the PEI indicates an anchor cell paging occasion of the anchor cell during the selected WUS occasion that is free from a subgroup containing the apparatus.

46. The method of any one of claims 40 to 45, wherein: determining the WUS transmission condition comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

47. The method of any one of claims 40 to 46, comprising: determining the WUS transmission condition by a user equipment (UE) while the UE is camping on the anchor cell.

48. The method of any one of claims 40 to 47, further comprising: prior to determining the WUS transmission condition, measuring the capacity cell and determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled.

49. The method of claim 48, further comprising: responsive to determining that the capacity cell meets cell reselection criteria and has SIB1 on demand functionality enabled, barring reselection of the capacity cell until the capacity cell SIB1 is acquired.

50. The method of any one of claims 40 to 49, further comprising: after transmitting the WUS to the capacity cell, determining to acquire a SIB1 from the capacity cell, and responsive thereto, acquiring the SIB1 from the capacity cell.

51. The method of claim 50, wherein: determining to acquire the SIB1 from the capacity cell comprises determining a measured reference signal received power (RSRP) and/or a measured reference signal received quality (RSRQ) of the anchor cell to be below a predetermined minimum reference signal measure.

52. The method of claim 50, wherein: determining to acquire the SIB1 from the capacity cell comprises determining based on the SIB1 timing information a next SIB1 transmission window of the capacity cell free from collision with any anchor cell paging occasion of the anchor cell to be a selected SIB1 transmission window; and acquiring the SIB1 from the capacity cell comprises acquiring the SIB1 from the capacity cell during the selected SIB1 transmission window.

53. The method of claim 52, wherein: determining the SIB1 transmission window of the capacity cell to be free from collision with any anchor cell paging occasion of the anchor cell comprises determining a SIB1 transmission window spacing between the selected SIB1 transmission window and any anchor cell paging occasion to be at least a predetermined minimum SIB1 transmission window spacing.

54. The method of claim 52 or 53, further comprising: after determining to acquire the SIB1 of the capacity cell and before acquiring the SIB1 from the capacity cell, determining that at least one anchor cell paging occasion precedes the selected SIB1 transmission window, and in response resynchronizing to the anchor cell before all of the at least one anchor cell paging occasion, and then resynchronizing to the capacity cell after all of the at least one anchor cell paging occasion and before the selected SIB1 transmission window.

55. The method of any one of claims 50 to 54, further comprising: after acquiring the SIB1 from the capacity cell, performing a cell reselection procedure to determine reselection to the capacity cell.

56. A method comprising: receiving, at an anchor cell, a wake-up signal (WUS) configuration and system information block 1 (SIB1) timing information from a capacity cell; and transmitting the WUS configuration and SIB1 timing information of the capacity cell to a user equipment (UE).

57. A method comprising: enabling, at a capacity cell, system information block 1 (SIB 1) on demand functionality; and transmitting wake-up signal (WUS) configuration and SIB1 timing information of the capacity cell to an anchor cell.

58. The method of any one of claims 40 to 57, wherein: the SIB1 timing information defines a timing of transmissions of the SIB1 by the capacity cell responsive to receiving a WUS at the capacity cell.

59. The method of claim 58, wherein: the SIB1 timing information defines a periodicity of transmissions of the SIB1 by the capacity cell responsive to receiving the WUS at the capacity cell.

60. The method of claim 58 or 59, wherein: the SIB1 timing information defines a predetermined delay between receiving the WUS at the capacity cell and transmissions of the SIB1 by the capacity cell.

61. A non-transitory computer-readable medium storing program instructions that, when executed by an apparatus, cause the apparatus to perform at least the method of any one of claims 40 to 60.