Devices, methods and system for priority-based wake-up signalling
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-08-13
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Figure CN2025076450_13082026_PF_FP_ABST
Abstract
Description
DEVICES, METHODS AND SYSTEM FOR PRIORITY-BASED WAKE-UP SIGNALLINGTECHNICAL FIELD
[0001] The present disclosure generally relates to the field of communications technology. For instance, the present disclosure provides devices, methods, and a system for priority-based wake-up signalling.BACKGROUND
[0002] The rapid evolution of wireless communication networks, particularly with the development of 5G, 6G and beyond, has significantly increased the demand for energy-efficient solutions. Modern networks are tasked with managing advanced services and applications, such as extended reality (XR) and ultra-reliable low-latency communications (URLLC) , which require extremely high data rates. This has led to denser network deployments, increased use of antennas, larger bandwidths, and more frequency bands. Consequently, controlling the environmental impact of these networks has become paramount for sustainable operations.
[0003] Energy consumption is a critical factor influencing the operational expenses (OPEX) of mobile network operators. According to industry reports, energy costs constitute approximately 23%of an operator’s total expenses, with the radio access network (RAN) contributing the largest share. The RAN’s power consumption can be divided into two categories. The first category is dynamic consumption, which occurs during active data transmission and reception. The second category is static consumption, which is needed to maintain the operational readiness of network devices even when no data transfer is occurring.
[0004] To address these challenges, the concept of Network Energy Saving (NES) has emerged as a critical objective. NES techniques aim to minimize both dynamic and static power consumption, thus reducing the carbon footprint and operational costs of wireless networks. Effective implementation of NES is essential for achieving the environmental sustainability goals of modern communication systems.SUMMARY
[0005] 3GPP Release 19 introduces the notion of on-demand System Information Block 1 (OD-SIB1) . OD-SIB1 allows UEs (User Equipment) in idle or inactive modes to receive system information from NES cells only when required, thereby reducing unnecessary transmissions and saving energy.
[0006] However, different UEs have varying capabilities and traffic requirements, which shall be accounted for when designing NES frameworks. Examples include: - Critical services: Emergency services and time-sensitive applications demand low latency and high reliability. - Reduced capability (RedCap) devices: Devices such as RedCap UEs, Ambient Internet of Things (A-IoT) devices, and Wake-Up Signal (WUS) -based UEs often operate with limited power budgets (e.g., due to energy harvesting constraints) or require frequent synchronization with the network due to oscillator accuracy limitations.
[0007] These limitations prevent certain UEs from waiting for long periods to acquire OD-SIB1. Therefore, there is a need to establish an OD-SIB1 framework that supports diverse UE requirements and capabilities.
[0008] The present disclosure addresses these challenges by providing a mechanisms for priority-based WUS configuration and signaling.
[0009] These and other objectives are achieved by the subject matter of the independent claims. Further implementation forms are apparent from the dependent claims, the description, and the drawings.
[0010] A first aspect of the present disclosure provides a terminal device configured to send, to a first network device associated with a first cell, terminal information for on-demand system information block (e.g., SIB1) provisioning; and receive, from the first network device, one or more dedicated configurations for accessing one or more second cells (or one or more second network devices) . The one or more dedicated configurations is determined by the first network device based on the terminal information. The terminal device is configured to access one of the one or more second cells based on the one or more dedicated configurations.
[0011] The terminal device may also be referred to as UE. The first network device associated with the first cell may include any base station in primary cell (cell A) . The second cell may be a network energy saving (NES) cell. In the present disclosure, term “cell A” may be used to referred to the first network device (e.g., a first base station) associated with the first cell, and term “NES cell” may be used to referred to a second network device (e.g., a second base station) associated with the second cell. When a plurality of NES Cells are used, they refer to a plurality of second network devices (e.g., second base stations) that are in network energy saving mode. In general, cell A, as a primary cell or any first network device in the primary cell, periodically and constantly transmits at least its own SIB1; while NES cell, as a network-energy saving cell or any second network device in the NES Cell, does not constantly transmit its own SIB1 but only transmits its own SIB1 when needed (e.g., upon request and / or upon decision) . The UE may receive a WUS configuration from cell A, and according to the WUS configuration, send a wake-up signal to NES cell. In response to receiving the wake-up signal, NES cell may start broadcasting SIB1, which is referred to as on-demand SIB1. By acquiring the SIB1 from NES cell, the UE can access the NES cell.
[0012] Optionally, the terminal information may comprise UE capability information. The UE capability information may indicate supported frequency bands, features (or UE type information) such as Non-Terrestrial Networks (NTN) compatibility, reduced capability (RedCap) , or A-IOT capability of the terminal device, allowing the first network device to tailor the dedicated configurations for optimal network performance.
[0013] According to the present disclosure, the UE is configured to provide its UE information to cell A and receive one or more dedicated configurations (e.g., dedicated WUS configurations) determined based on the UE information. The one or more dedicated configurations may indicate one or more suitable NES cells that could be suitable for the UE. Each dedicated configuration may comprise information for accessing a respective NES cell (arespective second network device) . Optionally, the plurality of dedicated configurations may be grouped and sent, by the first network device, into one signalling message. Alternatively, the plurality of dedicated configurations may be sent by the first network device separately. How the plurality of dedicated configurations are provided to the terminal device is not limited in the present disclosure.
[0014] Accordingly, the UE may decide which second cell to access. For accessing one of the one or more second cell (NES cell) , the terminal device may be configured to: - determining, from the one or more second cells, a target second cell to camp on based on the received one or more dedicated configuration; - initiate OD-SIB1 acquisition procedure in the target second cell based on the respective dedicated configuration.
[0015] From the received one or more dedicated configuration, the UE may decide which second cell is suitable (or the most suitable) to camp on considering its capability and / or preference.
[0016] To camp on the target second cell, the terminal device may be configured to: - obtain SIB1 from the target second cell according to a respective dedicated configuration. The dedicated configuration may specify parameters such as the SIB1 transmission window and frequency resources of the second cell; - connect to the target second cell based on the obtained SIB1.
[0017] In this way, unnecessary signaling and data exchange can be avoided, which can reduce latency in accessing NES cells, and enhance adaptability to the diverse requirements of UE. By tailoring configurations to specific UE capabilities and preferences, the present disclosure ensures optimized network utilization and improved UE experience.
[0018] In an implementation form of the first aspect, the terminal information comprises UE preference information such as: - a preference for a delay in provisioning the on-demand system information block; and / or - a preference for wake-up signal transmission periodicity.
[0019] The preference for a delay in provisioning the on-demand system information block allows the terminal device to optimize its energy consumption by deferring the provisioning of system information to periods where it is most efficient. For instance, the delay preference may be expressed as a range of acceptable delays, enabling the network to prioritize resources while maintaining a balance between latency and energy efficiency.
[0020] The preference for wake-up signal transmission periodicity allows the terminal device to specify intervals at which WUS transmissions should occur. This periodicity may be aligned with operational requirements, such as Discontinuous Reception (DRX) cycles, or dynamically configurable based on the terminal's activity patterns. By tailoring WUS periodicity, the terminal device can maintain synchronization with the network in a power-efficient manner, particularly for reduced-capability devices or latency-sensitive applications.
[0021] In a further implementation form of the first aspect, the one or more dedicated configurations comprises one or more dedicated WUS configurations, and for accessing one of the one or more second cells, the terminal device is configured to send a wake-up signal based on one of the one or more dedicated WUS configurations.
[0022] In a further implementation form of the first aspect, the terminal information comprises a preference for not triggering WUS transmission.
[0023] This preference indicates that the terminal device, although capable of supporting on-demand system information block (OD-SIB1) provisioning, opts not to initiate WUS transmissions under certain conditions. For example, this preference may be based on the terminal device's operational constraints, such as a limited power budget, as seen in low-power devices like A-IoT devices or reduced-capability UEs (RedCap UEs) . Such devices may prefer not to trigger WUS transmissions to conserve energy or adhere to power-class limitations.
[0024] By specifying this preference, the terminal device communicates its operational requirements to the network, enabling the first network device to tailor its configuration accordingly.
[0025] In a further implementation form of the first aspect, each of the one or more dedicated configuration comprises information to receive an availability signaling indicating the on-demand system information block is broadcast in a respective second cell. The terminal device is configured to receive the on-demand system information block in one of the one or more second cells according to the availability signaling.
[0026] The availability signaling provides the terminal device with information about the timing and duration of the on-demand system information block broadcast. This signaling may be transmitted through various mechanisms, including but not limited to physical layer (L1) signaling, and may indicate the system information block broadcast window in the one or more NES cells explicitly or implicitly. For example, the signaling may comprise information about the system information block broadcast start time and duration (e.g., in terms of slots, frames, milliseconds, or DRX cycles) .
[0027] By utilizing availability signaling, the terminal device can optimize its operations by selectively activating only when the on-demand system information block is available, thereby minimizing unnecessary power consumption and latency. This mechanism is particularly advantageous for low-power devices or UEs with stringent energy-saving requirements, as it eliminates the need for these devices to trigger WUS transmissions.
[0028] In a further implementation form of the first aspect, the terminal device is configured to receive the availability signaling through a physical layer signaling. The physical layer signaling comprises a paging message, a paging early indication (PEI) , or downlink control information (DCI) .
[0029] The use of physical layer signaling ensures that the availability signaling is transmitted efficiently and with minimal latency. This configuration allows the terminal device to operate with enhanced energy efficiency, as it only activates its reception mechanisms upon receiving the availability signaling. Further, the reliance on physical layer signaling ensures robust and reliable communication, which is particularly critical for devices with low power budgets or latency-sensitive applications.
[0030] A second aspect of the present disclosure provides a first network device associated with a first cell. The first network device is configured to: - receive terminal information for on-demand system information block provisioning from a terminal device; - determine one or more dedicated configurations for the terminal device to access one or more second cells based on the received terminal information; and -send the determined one or more dedicated configurations to the terminal device.
[0031] In an implementation form of the second aspect, the terminal information comprises a preference for a delay in provisioning the on-demand system information block; and / or a preference for WUS transmission periodicity.
[0032] In a further implementation form of the second aspect, the one or more dedicated configurations comprises one or more dedicated WUS configurations for the terminal device to access the one or more second cells.
[0033] In a further implementation form of the second aspect, the terminal information comprises a preference for not triggering WUS transmission.
[0034] In a further implementation form of the second aspect, each of the one or more dedicated configuration comprises information for the terminal device to receive an availability signaling indicating the on-demand system information block is broadcast in a respective second cell.
[0035] In a further implementation form of the second aspect, the first network device is configured to send the availability signaling through a physical layer signaling. The physical layer signalling comprises a paging message, a PEI, or DCI.
[0036] It is noted that the first network device of the second aspect may share the corresponding optional features and advantages introduced above for the terminal device of the first aspect.
[0037] A third aspect of the present disclosure provides a first network device associated with a first cell. The first network device is configured to provide a WUS configuration to one or more terminal devices. The WUS configuration comprises a plurality of priority levels for accessing one or more second cells.
[0038] Optionally, the first network device may be configured to provide the WUS configuration in a broadcast manner. The broadcast WUS configuration is not dedicated for a specific terminal device, but is a common WUS configuration.
[0039] Optionally, the WUS configuration defines at least two priority levels of RACH occasions and / or PRACH preambles.
[0040] The solution of the third aspect is an alternative to the solution of the first aspect and the second aspect. The first network device of the third aspect is configured to provide the WUS configuration (e.g., a common WUS configuration) to the terminal device, e.g., in a broadcast manner. The first network device does not provide any dedicated WUS configuration to the terminal device. The broadcast WUS configuration specifics different priority levels for accessing one or more second cells. That is, the WUS configuration may comprise information about RACH occasions (ROs) and / or PRACH preambles used in different priority levels for each second cell. The WUS configuration may further specify different conditions applying to each priority level.
[0041] The plurality of priority levels in the WUS configuration allows for differentiated handling of terminal devices based on their operational needs and / or capabilities. Each priority level may be associated with specific conditions, such as: - Priority Level 1: Configured for terminal devices with strict latency requirements or limited power budgets. This level specifies ROs and / or PRACH preambles optimized for minimal delay and efficient resource utilization. Terminal devices operating under critical services, such as emergency applications, may be employ this priority level to ensure timely access to the network. - Priority Level 2: Intended for terminal devices that do not meet the conditions of Priority Level 1 but still require access to the second cell. The conditions for this level may include relaxed latency thresholds or scenarios where the terminal device has moderate power constraints. - Additional Priority Levels: Optional levels can be defined to address specific use cases, such as devices supporting low-priority traffic or scenarios where multiple cells are available for access, allowing the network to distribute resources effectively.
[0042] The first network device, by providing the WUS configuration defining multiple priority levels, ensures scalability and simplicity in managing multiple terminal devices within the cell. Terminal devices may utilize the WUS configuration to select the appropriate RACH occasion or PRACH preamble based on their capabilities and current conditions.
[0043] This mechanism enhances network efficiency by reducing the signaling overhead associated with dedicated configurations. Furthermore, it provides a flexible framework for addressing the diverse requirements of terminal devices, ensuring that resources are allocated optimally and energy-saving goals are met.
[0044] A fourth aspect of the present disclosure provides a terminal device configured receive, from a first network device associated with a first cell, a WUS configuration. The WUS configuration comprises a plurality of priority levels for accessing one or more second cells. The terminal device is configured to access one of the one or more second cells using resources defined by one of the priority levels.
[0045] It is noted that the terminal device of the fourth aspect may share the corresponding optional features and advantages introduced above for the first network device of the third aspect. The solution of the third aspect and the fourth aspect is an alternative to the solution of the first aspect and the second aspect.
[0046] A fifth aspect of the present disclosure provides a method applied to terminal device. The method comprises: - sending terminal information for on-demand system information block provisioning to a first network device associated with a first cell; - receiving one or more dedicated configurations for accessing one or more second cells from the first network device, in which the one or more dedicated configurations is determined based on the terminal information; and - accessing one of the one or more second cells based on the one or more dedicated configurations.
[0047] In an implementation form of the fifth aspect, the terminal information comprises UE preference information such as: - a preference for a delay in provisioning the on-demand system information block; and / or - a preference for wake-up signal transmission periodicity.
[0048] In a further implementation form of the fifth aspect, the one or more dedicated configurations comprises one or more dedicated WUS configurations. Accessing one of the one or more second cells comprises sending a wake-up signal based on one of the one or more dedicated WUS configurations.
[0049] In a further implementation form of the fifth aspect, the terminal information comprises a preference for not triggering WUS transmission.
[0050] In a further implementation form of the fifth aspect, each of the one or more dedicated configuration comprises information to receive an availability signaling indicating the on-demand system information block is broadcast in a respective second cell. The method comprises receiving the on-demand system information block in one of the one or more second cells according to the availability signaling.
[0051] In a further implementation form of the fifth aspect, the terminal device is configured to receive the availability signaling through a physical layer signaling. The physical layer signaling comprises a paging message, a paging early indication (PEI) , or downlink control information (DCI) .
[0052] It is noted that the method of the fifth aspect may share the corresponding optional features and advantages introduced above for the terminal device of the first aspect.
[0053] A sixth aspect of the present disclosure provides a method applied to a first network device associated with a first cell. The method comprises:
[0054] receiving terminal information for on-demand system information block provisioning from a terminal device;
[0055] determining one or more dedicated configurations for the terminal device to access one or more second cells based on the received terminal information; and
[0056] sending the determined one or more dedicated configurations to the terminal device.
[0057] In an implementation form of the sixth aspect, the terminal information comprises a preference for a delay in provisioning the on-demand system information block; and / or a preference for WUS transmission periodicity.
[0058] In a further implementation form of the sixth aspect, the one or more dedicated configurations comprises one or more dedicated WUS configurations for the terminal device to access the one or more second cells.
[0059] In a further implementation form of the sixth aspect, the terminal information comprises a preference for not triggering WUS transmission.
[0060] In a further implementation form of the sixth aspect, each of the one or more dedicated configuration comprises information for the terminal device to receive an availability signaling indicating the on-demand system information block is broadcast in a respective second cell.
[0061] In a further implementation form of the sixth aspect, the method comprises sending the availability signaling through a physical layer signaling. The physical layer signalling comprises a paging message, a PEI, or DCI.
[0062] It is noted that the method of the sixth aspect may share the corresponding optional features and advantages introduced above for the terminal device of the first aspect.
[0063] A seventh aspect of the present disclosure provides a method applied to a first network device associated with a first cell. The method comprises providing a WUS configuration to one or more terminal devices. The WUS configuration comprises a plurality of priority levels for accessing one or more second cells.
[0064] It is noted that the method of the seventh aspect may share the corresponding optional features and advantages introduced above for the first network device of the third aspect.
[0065] An eighth aspect of the present disclosure provides a method applied to a terminal device. The method comprises receiving, from a first network device associated with a first cell, a WUS configuration. The WUS configuration comprises a plurality of priority levels for accessing one or more second cells. The method further comprises accessing one of the one or more second cells using resources defined by one of the priority levels.
[0066] It is noted that the method of the eighth aspect may share the corresponding optional features and advantages introduced above for the first network device of the third aspect.
[0067] A ninth aspect of the present disclosure provides a computer program comprising a program code for performing the method according to the fifth aspect, the eighth aspect, or any implementation form thereof.
[0068] A tenth aspect of the present disclosure provides a computer program comprising a program code for performing the method according to the sixth aspect, the seventh aspect, or any implementation form thereof.
[0069] An eleventh aspect of the present disclosure provides a non-transitory storage medium storing executable program code which, when executed by a processor (or a chipset) , causes the method according to the fifth aspect, the eighth aspect, or any implementation form thereof to be performed.
[0070] A twelfth aspect of the present disclosure provides a non-transitory storage medium storing executable program code which, when executed by a processor (or a chipset) , causes the method according to the sixth aspect, the seventh aspect, or any implementation form thereof to be performed.
[0071] It has to be noted that all devices, elements, units and means described in the present application could be implemented in the software or hardware elements or any kind of combination thereof. All steps which are performed by the various entities described in the present application as well as the functionalities described to be performed by the various entities are intended to mean that the respective entity is adapted to or configured to perform the respective steps and functionalities. Even if, in the following description of the present disclosure, a specific functionality or step to be performed by external entities is not reflected in the description of a specific detailed element of that entity which performs that specific step or functionality, it should be clear for a skilled person that these methods and functionalities can be implemented in respective software or hardware elements, or any kind of combination thereof.BRIEF DESCRIPTION OF DRAWINGS
[0072] The above-described aspects and implementation forms will be explained in the following description in relation to the enclosed drawings, in which
[0073] FIG. 1 shows an example of a communication system;
[0074] FIG. 2 show a further example of a communication system;
[0075] FIG. 3 shows a diagram of a method applied to a terminal device;
[0076] FIG. 4 show a diagram of a method applied to a first network device associated with a first cell; and
[0077] FIG. 5 shows a signalling diagram of a communication system.DETAILED DESCRIPTION
[0078] A list of key terms and their acronyms / abbreviations used in the present disclosure is given as follows: 3rd Generation Partnership Project -3GPP; Ambient Internet of Things –A-IoT; Base Station –BS; Downlink Control Information –DCI; Downlink –DL; gNodeB –gNB; New Radio –NR; Wake Up Signal - WUS; On-Demand –OD; Physical Downlink Control Channel –PDCCH; Physical Downlink Shared Channel -PDSCH; Physical Random Access Channel –PRACH; Network Energy Saving –NES; Random Access –RA; Radio Resource Control –RRC; System Information Block –SIB; Uplink –UL; User Equipment –UE.
[0079] The present disclosure provides improvements for implementing wake-up signaling in wireless communications.
[0080] FIG. 1 shows an example of a communication system 100. The system 100 comprises a first network device 110, one or more second network devices 120a, 120b, and a terminal device 130 (or referred to as UE 130) . It shall be noted that the number of first network device and terminal device is also not limited. It is possible that there may be a plurality of first network devices and a plurality of terminal devices in the system 100. For simplicity, the present disclosure is described with respect to one terminal device 130 and one first network device 110.
[0081] The first network device 110 is associated with a first cell. The first cell is also referred to as a primary cell (or anchor cell) and is not in an energy saving mode. That is, any network device, including the first network device 110, associated with the first cell is configured to constantly transmit SIB1. In the present disclosure, the first network device 110 may be simply referred to as Cell A.
[0082] The second network device 120a, 120b is associated with a second cell. The second cell is also referred to as a network-energy saving cell. That is, any network device, including the second network device 120a, 120b, associated with the second cell is configured not to constantly transmit SIB1 but is configured to transmit on-demand SIB 1 (OD-SIB1) for a period of time upon request (e.g., triggered by a WUS from the UE) . In the present disclosure, the second network device 120a, 120b may be simply referred to as NES Cell.
[0083] According to the present disclosure, the UE 130 is configured to send, to Cell A 110, terminal information 101 for on-demand system information block provisioning. For instance, the UE 130 may be configured to send, to Cell A 110, its capability and / or its preference information that may be related to detecting on-demand SIB1 as part of the terminal information 101.
[0084] The terminal information 101 may comprises NES related information elements, such as: - support indication of OD-SIB1 feature; - UE preference of the delay of provisioning OD-SIB1 if reselect to an NES cell; - UE preference on the periodicity of WUS occasions (or maximum latency preferred to have for WUS transmission on any possible NES cell) ; - UE although they support OD-SIB1 but they have a preference of not triggering WUS at all. Due to latency and power class they have (e.g., A-IOT devices) .
[0085] Based on the terminal information 101 received from the UE 130, Cell A 110 is configured to provide one or more dedicated configurations 102 (e.g., dedicated WUS configurations 102) of one or more NES cells that are suitable for the reported UE capability and / or preferences. The one or more dedicated WUS configurations 102 may be sent via an RRC message, such as an RRC Release Message.
[0086] It is noted that the one or more dedicated WUS configurations 102 are sent exclusively to the terminal, since they are determined / tailored based on the terminal information 101. However, it is noted that the present disclosure does not preclude the case where Cell A 110 is configured to provide a common WUS configuration by broadcasting it for idle / inactive UEs that has no access to Cell A (or is not in RRC connected mode on Cell A 110) .
[0087] The UE 130 of the present disclosure was already, at least once, in a connected mode (e.g., RRC connected state) with Cell A 110. Accordingly, Cell A 110 is configured to provide dedicated WUS configuration (s) suitable for UE capabilities and / or preferences to the UE 130. For instance, Cell A 110 may choose NES cells suitable for the bands supported by the UE 130, NES cells suitable for the features of the UE 130 (e.g., NTN, RedCap) , NES cells suitable for the traffic model supported by the UE 130, and dedicated L1 signaling to help satisfy UE preferences. The dedicated WUS configuration (s) has higher priority than the broadcast common WUS configuration if the UE 130 acquires both and if there are differences.
[0088] The UE 130 may be configured to use the one or more dedicated WUS configurations 102 to decide which NES Cell 120a, 120b to camp on, if there is any.
[0089] The UE 130 may be configured to send a WUS 103 according to a received dedicated WUS configuration to camp on a respective NES Cell (e.g., 120b) .
[0090] Sending a WUS 103 is optional. Alternatively, it is also possible that although the UE 130 supports OD-SIB 1, but the UE 130 has a preference of not sending a WUS if possible, e.g., due to its latency and power class limitation (e.g., special type of A-IOT devices (e.g., Class C) ) . In such cases, the UE 130 is configured to inform Cell A 110 about its preference for not triggering WUS transmission via the terminal information 101. The UE 130 may be configured to rely on dedicated Layer 1 (L1) signaling from Cell A 110 to determine whether an NES Cell (e.g., 120b) is broadcasting the OD-SIB1. The dedicated L1 signaling may comprise new types of paging messages, a PEI, or a DCI. Information for receiving such dedicated L1 signalling may be comprised in a respective dedicated WUS configuration for a corresponding NES Cell 120b. This signaling mechanism enables the UE 130 to efficiently ascertain the availability of OD-SIB1 in an NES Cell 120b without the need to send a WUS.
[0091] Upon receiving the dedicated L1 signaling, the UE 130 may evaluate whether it is suitable to reselect to the NES Cell 120b to directly receive the OD-SIB1. This eliminates unnecessary signaling and reduces energy consumption, particularly for UEs with constrained power budgets or specific latency requirements. For example, Class C A-IoT devices may use this mechanism to optimize their operational efficiency.
[0092] If the UE 130 does not detect OD-SIB1 in the NES Cell 120b after reselection, it may decide to either trigger a WUS requesting the OD-SIB1 or return to Cell A 110. This decision can be based on implementation-specific policies, ensuring flexibility in the UE behavior based on its requirements and network conditions.
[0093] The use of dedicated L1 signaling for informing the UE 130 about OD-SIB1 broadcasts significantly reduces the waiting time and power consumption associated with idle periods. Further, it also ensures that UEs are only activated when necessary, thereby enhancing overall system efficiency. This is particularly advantageous when the UE 130 is paged by the Cell A 110 during the broadcast of OD-SIB1 in the NES Cell 120b, as it allows for timely synchronization and minimal delay.
[0094] Overall, the solution provides a scalable and efficient solution to support diverse UE capabilities and requirements, ensuring seamless operation in energy-saving scenarios and latency-sensitive applications.
[0095] FIG. 2 show a further example of a communication system 200. The composition of the system 200 of FIG. 2 is the same as the system 100 of FIG. 1: a first network device (Cell A) 210, one or more second network devices (NES Cell) 220a, 220b, and a terminal device (UE) 230. Their details are not repeated herein.
[0096] Unlike the system 100 of FIG. 1, in this system 200 of FIG. 2, the UE 230 does not or is not able to send its terminal information to Cell A 210. For instance, the Cell A is not the last serving cell before the UE entering inactive / idle mode, or the UE 230 was never in connected mode (e.g., RRC connected state) with Cell A 210, or the latest acquired dedicated WUS configurations from Cell A are not valid any more. Cell A 210 does not or is not able to provide any, up to date, dedicated WUS configuration to the UE 230. In this case, Cell A 210 may be configured to broadcast a WUS configuration 202 in the cell, so that any UE in the cell may acquire the WUS configuration. The UE 230 is capable of obtaining the WUS configuration in Cell A 210. For obtaining the broadcast WUS configuration, the UE 230 does not need to enter RRC connected mode with Cell A 210. The broadcast WUS configuration 202 comprises information or configurations with different priority levels for accessing one or more NES Cells 220a, 220b. For each NES Cell 220a, 220b, the WUS configuration 202 may comprise information with at least two priority levels, such as different RO and / or RA preamble configurations with different priority levels.
[0097] For instance, the broadcast WUS configuration 202 may comprise information element such as: - Priority level 1 ROs and / or PRACH preambles: to be used by UE with limited power budget and / or having tight latency traffic and / or in case no other cell in the network having good channel conditions for the UE except a certain NES cell; - Priority level 2 ROs and / or PRACH preambles: to be used in case conditions of Priority 1 are not fulfilled; - More priorities ROs and / or PRACH preambles.
[0098] Accordingly, the UE 230 is configured to access a suitable NES Cell using a configuration with a suitable priority level. For instance, the UE 230 may use a priority level 1 PRACH preamble 205 with a priority level 1 RO to access the NES Cell 220b. The NES Cell 220b, based on the PRACH preamble 205, may be configured to provide OD-SIB1 with low or high latency on one or more beams.
[0099] An example of new elements that may be comprised in the WUS configuration is as follows:
[0100] [rach-OccasionSIB1-Priority 1: -Prach-ConfigurationIndex -msg1-FDM; -msg1-FrequencyStart; -zeroCorrelationZoneConfig; -preambleReceivedTargetPower; -preambleTransMax; -powerRampingStep; -ra-ResponseWindow; -ssb-perRACH-Occasion; - (…) rach-OccasionSIB1-Priority 2: -Prach-ConfigurationIndex; -msg1-FDM -msg1-FrequencyStart; -preambleTransMax; -ra-ResponseWindow; - (…) ]
[0101] The solutions introduces with respect to FIG. 1 and FIG. 2 may be used in different scenarios.
[0102] For instance, the solution of FIG. 1 may be used for idle or inactive UEs that support on-OD-SIB1 and have Cell A as their last serving cell before transitioning to an idle or inactive state. In this case, the UEs may share their capabilities and / or preferences with Cell A. This information is exchanged while the UE is in connected mode through messages such as the UECapabilityInformation message, which specifies the UE's supported features (e.g., supported frequency bands, network energy-saving capabilities, or device class) , and / or the UEAssistanceInformation message, which may convey the UE's preferences (e.g., latency tolerance or preferred periodicity for wake-up signals) .
[0103] For these UEs, the challenge lies in determining how Cell A can assign priorities for triggering OD-SIB1 in a way that aligns with the capabilities and preferences of the UE. According to the solution of FIG. 1, Cell A can achieve this by using the received information to generate and provide dedicated configurations tailored to the specific requirements of the UE.
[0104] The solution of FIG. 2 may be used for idle or inactive UEs that support OD-SIB1 but did not have Cell A as their last serving cell, or do not have a valid configuration for triggering OD-SIB1 (e.g., WUS configuration) any more. These UEs lack a mechanism to share their capability and preference information with Cell A, and have no prior communication history with Cell A, which complicates the task of providing tailored configurations for triggering OD-SIB1. According to the solution of FIG. 2, Cell A may rely on a broadcast mechanism to provide WUS configurations that include multiple priority levels for accessing NES cells. These priority levels may be designed to accommodate a wide range of UEs, even in the absence of specific capability or preference information. The broadcast WUS configurations enable UEs to self-select the appropriate RACH occasion and / or PRACH preamble based on their operational conditions and capabilities. This approach ensures that even UEs without prior interaction with Cell A can access NES cells efficiently, thereby maintaining the network’s energy-saving objectives while supporting diverse use cases.
[0105] It is noted that the two alternative solutions (e.g., FIG. 1 and FIG. 2) in the present disclosure may be applied to the same first network device. That is, the two alternative solutions may be combinable for network device perspective. For instance, a single Cell A may be configured to broadcast the common WUS configuration comprising multiple priority levels, and provide dedicated WUS configuration (s) in response to any received UE information. The two solutions may be employed by the same network device (e.g., base station) in the primary cell for accommodating different UEs in different scenarios.
[0106] FIG. 3 shows a diagram of a method applied to a terminal device. The method comprises the following steps.
[0107] Step 301: sending terminal information for on-demand system information block provisioning to a first network device associated with a first cell.
[0108] Step 302: receiving one or more dedicated configurations for accessing one or more second cells from the first network device, in which the one or more dedicated configurations is determined based on the terminal information.
[0109] Step 303: accessing one of the one or more second cells based on the one or more dedicated configurations.
[0110] FIG. 4 shows a diagram of a method applied to a first network device associated with a first cell. The method comprises the following steps.
[0111] Step 401: receiving terminal information for on-demand system information block provisioning from a terminal device.
[0112] Step 402: determining one or more dedicated configurations for the terminal device to access one or more second cells based on the received terminal information.
[0113] Step 403: sending the determined one or more dedicated configurations to the terminal device.
[0114] The methods of FIG. 3 and FIG. 4 corresponds to one solution proposed by the present disclosure, in which dedicated WUS configuration (s) is provided by Cell A based on terminal information (e.g., UE capability and / or preference) . The method of FIG. 3 and FIG. 4 may share the same optional features and advantages mentioned above in the “Summary” part and with respect to FIG. 1.
[0115] FIG. 5 shows a signalling diagram of a communication system. The communication system may be built based on the example shown in FIG. 2. The signaling diagram depicts the following steps.
[0116] Step 501: providing, by a first network device associated with a first cell (e.g., Cell A) to a terminal device (e.g., UE) . The WUS configuration comprises a plurality of priority levels for accessing one or more second cells.
[0117] Step 502: accessing, by the terminal device, accessing one of the one or more second cells using resources defined by one of the priority levels.
[0118] The signalling shown in FIG. 5 corresponds to an alternative solution with respect to FIG. 3 and FIG. 4. In FIG. 5, no terminal information (e.g., UE capability and / or preference) is received by Cell A. Cell A is configured to broadcast a WUS configuration comprising a plurality of priority levels for accessing one or more second cells (NES Cells) . The signalling of FIG. 5 may share the same optional features and advantages mentioned above in the “Summary” part and with respect to FIG. 2.
[0119] Overall, the present disclosure provides a solution for enabling efficient and priority-based WUS configuration and signaling. A terminal device sends terminal information, such as UE capability and cell access preference, to a first network device associated with a first cell. Based on this information, the first network device determines one or more dedicated configurations for accessing one or more second cells, and transmits the one or more dedicated configurations to the terminal device. The terminal device uses the one or more dedicated configurations to efficiently access one of the one or more second cells.
[0120] In an alternative approach, the first network device provides (e.g., broadcasts) a WUS configuration with multiple priority levels for NES cell access, allowing UEs without prior interaction with the first cell to self-select a suitable priority cell access level based on their requirements.
[0121] These mechanisms accommodate diverse UE capabilities and operational conditions, reduce signaling overhead, and ensure energy-efficient access in advanced communication networks, including 5G and beyond.
[0122] The present disclosure may be applied to any telecommunications networks / systems, such as but not limited to 5G (or NR) , 6G mobile networks, and the like. The network devices and the terminal device in this disclosure each may comprise processing circuitry or a chipset (not shown) configured to respectively perform, conduct or initiate the various operations described herein. The processing circuitry may comprise hardware and software. The hardware may comprise analog circuitry or digital circuitry, or both analog and digital circuitry. The digital circuitry may comprise components such as application-specific integrated circuits (ASICs) , field-programmable arrays (FPGAs) , digital signal processors (DSPs) , or multi-purpose processors. Optionally, the processing circuitry (or the chipset) comprises one or more processors and a non-transitory memory connected to the one or more processors. The non-transitory memory may carry executable program code which, when executed by the one or more processors, causes the devices to perform, conduct or initiate the operations or methods described herein.
[0123] The present invention has been described in conjunction with various embodiments as examples as well as implementations. However, other variations can be understood and effected by those persons skilled in the art and practicing the claimed invention, from the studies of the drawings, this disclosure and the independent claims. In the claims as well as in the description the word “comprising” does not exclude other elements or steps and the indefinite article “a” or “an” does not exclude a plurality. A single element or other unit may fulfill the functions of several entities or items recited in the claims. The mere fact that certain measures are recited in the mutual different dependent claims does not indicate that a combination of these measures cannot be used in an advantageous implementation.
Claims
1.A terminal device (130) configured to:send terminal information (101) for on-demand system information block provisioning to a first network device (110) associated with a first cell;receive one or more dedicated configurations (102) for accessing one or more second cells (120a, 120b) from the first network device, wherein the one or more dedicated configurations (102) are determined based on the terminal information; andaccess one (120b) of the one or more second cells (120a, 120b) based on the one or more dedicated configurations.2.The terminal device (130) according to claim 1, wherein the terminal information (101) comprises:a preference for a delay in provisioning the on-demand system information block; and / ora preference for wake-up signal, WUS, transmission periodicity.3.The terminal device (130) according to claim 1 or 2, wherein the one or more dedicated configurations (101) comprises one or more dedicated WUS configurations, and for accessing one of the one or more second cells, the terminal device (130) is configured to send a wake-up signal (103) based on one of the one or more dedicated WUS configurations.4.The terminal device (130) according to claim 1, wherein the terminal information (101) comprises a preference for not triggering WUS transmission.5.The terminal device (130) according to claim 4, wherein each of the one or more dedicated configuration comprises information to receive an availability signaling indicating the on-demand system information block is broadcast in a respective second cell, and the terminal device (130) is configured to receive the on-demand system information block in one of the one or more second cells according to the availability signaling.6.The terminal device (130) according to claim 5, configured to receive the availability signaling through a physical layer signaling, wherein the physical layer signaling comprises a paging message, a paging early indication, or downlink control information.7.A first network device (110) associated with a first cell, wherein the first network device (110) is configured to:receive terminal information (101) for on-demand system information block provisioning from a terminal device;determine one or more dedicated configurations (102) for the terminal device to access one or more second cells (120a, 120b) based on the received terminal information; andsend the determined one or more dedicated configurations (102) to the terminal device (130) .8.The first network device (110) according to claim 7, wherein the terminal information (101) comprises:a preference for a delay in provisioning the on-demand system information block; and / ora preference for wake-up signal, WUS, transmission periodicity.9.The first network device (110) according to claim 7 or 8, wherein the one or more dedicated configurations (102) comprises one or more dedicated WUS configurations for the terminal device (130) to access the one or more second cells (120a, 120b) .10.The first network device (110) according to claim 7, wherein the terminal information (101) comprises a preference for not triggering WUS transmission.11.The first network device (110) according to claim 10, wherein each of the one or more dedicated configuration (102) comprises information for the terminal device (130) to receive an availability signaling indicating the on-demand system information block is broadcast in a respective second cell.12.The first network device (110) according to claim 11, configured to send the availability signaling through a physical layer signaling comprising a paging message, a paging early indication, or downlink control information.13.A method (300) applied to a terminal device, the method comprising:sending (301) terminal information for on-demand system information block provisioning to a first network device associated with a first cell;receiving (302) one or more dedicated configurations for accessing one or more second cells from the first network device, wherein the one or more dedicated configurations is determined based on the terminal information; andaccessing (303) one of the one or more second cells based on the one or more dedicated configurations.14.A method (400) applied to a first network device associated with a first cell, the method comprising:receiving (401) terminal information for on-demand system information block provisioning from a terminal device;determining (402) one or more dedicated configurations for the terminal device to access one or more second cells based on the received terminal information; andsending (402) the determined one or more dedicated configurations to the terminal device.15.A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method according to claim 13 or 14.