Triggering on demand-synchronization signal block (ODSSB) transmission in NES cell from a neighboring cell

Abstract

A method, disclosed in the present disclosure, comprises receiving a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU). It further comprises updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification. It further comprises transmitting the updated information to one or more neighboring Centralized Units (CUs) to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.

Description

TRIGGERING ON DEMAND- SYNCHRONIZATION SIGNAL BLOCK (ODSSB) TRANSMISSION IN NES CELL FROM A NEIGHBORING CELLCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from Indian Provisional Patent Application No.202541009875, filed on February 6, 2025, and Indian Non-Provisional Patent Application No.202541009875, filed on November 17, 2025, the entire contents of which are incorporated herein by reference.FIELD

[0002] The present disclosure relates to triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell.BACKGROUND

[0003] Network energy efficiency is a performance requirement in wireless networks. Consequently, Third Generation Partnership Project (3 GPP) standards are designed to enable low energy consumption, not only in user terminals, but also in network equipment. New features for energy savings (also termed as Network Energy Savings (NES) features) are introduced. For example, much longer durations and higher ratio of Discontinuous Transmission (DTX) is supported in New Radio (NR) compared to the 3GPP Long Term Evolution (LTE) standard. Also, the feature of transmitting System Information Blocks (SIBs) only on-demand is supported. Network energy saving is of great importance for environmental sustainability, to reduce environmental impact (greenhouse gas emissions), and for operational cost savings. Cells associated with the NES features (also termed as NES cells) stay in a dormant state or sleep state to save energy. The NES cells stay in the dormant state until a wake-up signal is received. The NES cells transmit SIBs to the user terminals on receiving the wake-up signal.

[0004] The SIBs are broadcast messages from a base station or an eNodeB to User Equipment (UEs) that contain information relevant when evaluating whether a UE is allowed to access a cell and defines the scheduling of other system information. The SIB is a downlink broadcastinformation block transmitted periodically by the base station. The SIB is very critical information for the UE to connect to the base station. The UE needs SIB for cell camping when it is powered on, and for cell selection and cell re-selection when it is in Radio Resource Control (RRC) IDLE mode. SIB provides all necessary details like system frame number, system bandwidth, Public Land Mobile Network (PLMN), cell selection and re-selection thresholds, and the like, to access the network. The SIB also indicates whether one or more SIBs are only provided on-demand, in which case, it may also provide Physical Random Access Channel (PRACH) configuration needed by the UE to request for the required SIB.

[0005] The information disclosed in this background section is only for enhancement of understanding of the general background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.SUMMARY

[0006] In an embodiment, the present disclosure discloses a method. The method comprises receiving a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU). Further, the method comprises updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification. Finally, the method comprises transmitting the updated information to one or more neighboring Centralized Units (CUs) to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.

[0007] In an embodiment, the present disclosure discloses a Centralized Unit (CU). The CU is configured to receive a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU). Further, the CU is configured to update information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification. Finally, the CU is configured to transmit the updated information to one or more neighboring CUs to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.

[0008] In an embodiment, the present disclosure discloses a non-transitory computer readable medium including instructions for performing operations comprising receiving a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU). Further, the operations comprising updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification. Finally, the operations comprising transmitting the updated information to one or more neighboring Centralized Units (CUs) to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Features, aspects, and advantages of embodiments of the disclosure will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, and wherein:

[0010] FIG. 1 illustrates an exemplary architecture illustrating triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell, in accordance with some embodiments of the present disclosure;

[0011] FIG. 2 shows an exemplary call flow diagram illustrating triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell, in accordance with some embodiments of the present disclosure;

[0012] FIG. 3 shows a flowchart illustrating a method of ORAN Radio Unit (O-RU) rehoming for energy saving, in accordance with some embodiments of the present disclosure; and

[0013] FIG. 4 shows a diagram of example components of an apparatus for triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell, in accordance with embodiments of the present disclosure.DETAILED DESCRIPTION

[0014] The following detailed description of example embodiments refers to the accompanying drawings. The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the implementations to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the implementations. Further, one or more features or components of one embodiment may be incorporated into or combined with another embodiment (or one or more features of another embodiment). Additionally, the flowchart and description of operations provided below relate to one of the various embodiments. It should be noted that it is possible to make other embodiments that do not exactly match the flowchart and its description. It is understood that in other embodiments one or more operations may be omitted, one or more operations may be added, one or more operations may be performed simultaneously (at least in part).

[0015] It will be apparent that systems and / or methods, described herein, may be implemented in different forms of hardware, software, or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting of the implementations. Thus, the operation and behavior of the systems and / or methods are described herein without reference to specific software code. It is understood that software and hardware may be designed to implement the systems and / or methods based on the description herein.

[0016] Even though particular combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of implementations. In fact, many of these features may be combined in ways not specifically recited in the claims and / or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of implementations includes each dependent claim in combination with every other claim in the claim set.

[0017] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and may be used interchangeably with “one or more.” Also, as used herein, the terms “has,” “have,” “having,” “include,” “including,” or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on”unless explicitly stated otherwise. Furthermore, expressions such as “at least one of [A] and [B],” “[A] and / or [B],” or “at least one of [A] or [B]” are to be understood as including only A, only B, or both A and B.

[0018] The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the implementations to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the implementations.

[0019] As discussed in background section, when a cell transitions to a Network Energy Saving (NES) mode, the cell may stop transmitting periodic SSB when always-on SSB on the cell is deactivated or reduce instance of periodic SSB transmissions when always-on SSB is periodically transmitted on the cell. To address both the scenarios, the present disclosure proposes triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell.

[0020] FIG. 1 illustrates an exemplary architecture illustrating triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell, in accordance with some embodiments of the present disclosure.

[0021] Exemplary architecture illustrates a gNodeB (gNB) 101 which includes a Central Unit (CU) 103, cell 107i to cell 107N (also referred as one or more cells 107). The exemplary architecture also illustrates gNB 111 which includes a CU 113, DU 115i, DU 1152, and cell 117i to cell 117N (also referred as one or more cells 117). The gNB 101 and the gNB 111 may include plurality of CUs, plurality of DUs and a plurality of cells (not shown in figure), however for explanation of the present disclosure, only limited CU, DU and cells are shown in the figures. Further, the gNB 111, CU 113, DU 115i, DU 1152, and the one or more cells 117 are referred as neighboring gNB 111, neighboring CU 113, neighboring DU 1151, neighboring DU 1152, and neighboring one or more cells 117 respectively, however for explanation of the present disclosure. The gNB 101 may be associated with a plurality of neighboring gNB, however for explanation of the present disclosure only one neighboring gNB is illustrated, i.e., the gNB 111. The following description is discussed from perspective of the gNB 101, CU 103, DU 105, and the one or more cells 107.

[0022] In an embodiment, the DU 105 may be configured to update Network Energy Saving (NES) status and the SSB transmission condition of the one or more cells 107. The one or more cells 107 may be at least one of a Primary Cell (PCell) and a Secondary Cell (SCell). The NES mode enables dynamic optimization of cell energy consumption based on real-time traffic conditions by intelligently deactivating or reducing power to underutilized radio resources during low-traffic periods. The network maintains service quality while significantly reducing operational energy costs. This feature supports sustainability goals and enhances overall network efficiency. The SSB transmission condition defines the criteria under which synchronization signal blocks are broadcasted by 5G New Radio (NR) cells. The transmission is configured based on periodicity, beam sweeping, and network load conditions. Steps such as reducing frequency or disabling under low traffic helps in enhancing spectral efficiency and conserves energy while maintaining reliable connectivity for UEs. In an embodiment, since the DU 105 is responsible for transmission of the SSB, the DU 105 may be configured to determine whether to transition to the NES mode. Upon transitioning to the NES mode, the DU 105 may be configured to transmit a notification to the CU 103 indicating change in the NES mode and the SSB transmission condition. As an example, the DU 105 may transmit the notification over Fl interface.

[0023] In an embodiment, the CU 103 may be configured to receive the notification indicating change in the NES status and the SSB transmission condition of the one or more cells 107 associated with the DU 105. The notification may include, without limitation, at least one of, cell Identifier (ID), SSB transmission mode and SSB parameters. The cell ID may be an identifier to indicate the cells transitioned to the NES mode and updated SSB transmission condition. The SSB transmission mode may indicate current SSB transmission mode. The current SSB transmission mode may be the SSB transmission mode upon transitioning to the NES mode. The SSB parameters may indicate parameters associated with the current SSB transmission mode.

[0024] In an embodiment, upon receiving the notification, the CU 103 may be configured to update information related to the NES status and the SSB transmission condition based on the notification The information related to the NES status and the SSB transmission condition may include, without limitation, at least one of, cell Identifier (ID), SSB transmission mode and SSB parameters. In an embodiment, the information may be stored in a format of a table. In someembodiments, the information may be stored in other data structure formats. In an embodiment, existing information in the CU 103 may be updated with the NES status and the SSB transmission condition received from the DU 105. The information in the CU 103 is updated each instance when the notification is received from the CU 103.

[0025] In an embodiment, upon updating the information, the CU 103 may be configured to transmit the updated information to one or more neighboring Centralized Units (CUs) 113 to update tracking information related to the NES status and the SSB transmission condition of the one or more cells 107. As discussed earlier, certain functionalities in the neighboring gNBs 111 may be affected by the NES cells SSB transmission configuration. The one or more cells 107 with NES status active are referred to as the NES cells. Further, key features such as, without limitation, L1 / L2 Triggered Mobility (LTM), Conditional Handover (CHO), Dual Active Protocol Stack (DAPS), multi-Transmission Reception Point (mTRP), and New Radio Dual Connectivity (NR-DC) may experience performance impacts due to changes in the SSB transmission condition. Additionally, the ability of neighboring gNBs 111 to configure measurement objects in User Equipment (UEs) may be compromised. For instance, if a UE is instructed to report measurements on the NES cell’s SSB and the NES mode disables SSB transmission, the UE’s behavior may be unpredictable. This lack of measurement data can adversely affect mobility procedures and degrade performance in scenarios such as inter-frequency Load Balancing (LB), where the NES cell might otherwise serve as a viable offloading target. The SSB transmission status of a cell has direct implications on the operational integrity of neighboring cells. In view of these dependencies, the CU 103 is configured to transmit the updated information to one or more neighboring CUs 113 to update tracking information related to the NES status and the SSB transmission condition of the one or more cells 107. As an example, the updated information may be transmitted over an Xn interface. The transmission of the updated information ensures network performance is maintained under energy-saving configurations. The tracking information may include, without limitation, at least one of cell Identifier (ID), SSB transmission mode, SSB parameters, Hand Over status, feature support for each of the one or more cells 107. Similar to the information stored in the CU 103, the one or more neighboring CUs 113 may also store the updated information received from the CU 103 of the NES cell. In an embodiment, the tracking information may be stored in a format of a table. In some embodiments, the tracking information may be stored in other data structure formats. The tracking information may help in keeping a track of the NES status and the SSBtransmission condition. Further, transmitting the updated information may enable the one or more neighboring CUs 113 to devise strategy in executing the key features such as, without limitation, LTM, CHO, DAPS, mTRP, and NR-DC. In an embodiment, the CU 103 is configured to update the one or more neighboring CUs 113 when there is a change in the NES status and the SSB transmission condition of the one or more cells 107.

[0026] In an embodiment, the one or more neighboring CUs 113 may perform one or more operations based on the tracking information stored in the one or more neighboring CUs 113. This ensures that the network performance is maintained since the one or more neighboring CUs 113 are updated with the NES status and SSB transmission condition of the one or more cells 107.

[0027] In an embodiment, when a trigger condition to trigger the OD-SSB in the NES Cell is met, the one or more neighboring CUs 113 may transmit a trigger message to the CU 103 for triggering the OD-SSB transmission in at least one cell. The at least one cell may be the NES cell. The trigger message may include, without limitation a cause Information Element (IE). The IE may provide an additional information to the at lease one cell. In an embodiment, the one or more neighboring CUs 113 may select the at least one cell based on the SSB transmission condition. As discussed earlier, the one or more neighboring CUs 113 stores the tracking information related to the NES status and the SSB transmission condition of the one or more cells 107 which enables the one or more neighboring CUs 113 to select the at least one cell. As an example, the tracking information may also be referred to as Network Energy Saving Neighbor Relationship Table (NES NRT). This enables the neighboring gNB 111 (or the one or more neighboring CUs 113) to trigger the OD-SSB for the suitable NES Cell based on the trigger condition. The trigger conditions may be any existing trigger condition to trigger the OD-SSB. In some embodiments, the trigger message may be transmitted by the CU 103 of the one or more cells 107. In other words, the CU CU 103 of the one or more cells 107 may also transmit the trigger message. The procedure to be followed upon receiving the trigger message remains irrespective from the source of the trigger message.

[0028] In an embodiment, upon receiving the trigger message, the CU 103 may be configured to transmit the trigger message to the DU 105 to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message. The CU 103 may also transmit an assistance information with the trigger message. The assistance information mayprovide information related to parameters to be adopted by the DU 105 for the SSB transmission condition. Upon receiving an OD-SSB transmission trigger from the CU 103, the DU 105 may evaluate multiple factors before deciding on the appropriate SSB transmission response. The multiple factors may include, without limitation:• Severity of the cause, as indicated by the cause IE received from the one or more neighboring CUs 113.• Impact on Energy Saving (ES) telemetry, as computed locally at the DU 105,• Anticipated duration for which OD-SSB transmission may be required, and• Type of SSB transmission mode to be activated. Either OD-SSB or the default periodic SSB transmission.

[0029] In an embodiment, based on assessment of the multiple factors, the DU 105 may choose to maintain the current NES mode, initiate OD-SSB transmission, or revert to default SSB transmission. This decision-making process ensures that the NES cell can dynamically adapt its synchronization signaling behavior in response to network conditions, thereby balancing energy efficiency with service continuity.

[0030] In an embodiment, if the DU 105 determines to change the NES status and the SSB transmission condition, the DU 105 may indicate about the change in status to the CU 103. Further, the CU 103 may be configured to update the information related to the NES status and the SSB transmission condition. The information here refers to the information stored in the CU 103. Upon updating the information, the CU 103 may be configured to transmit the updated information to the one or more neighboring CUs 113 to update the tracking information. In other words, if there is a change in the NES status and the SSB transmission condition, the one or more neighboring CUs 113 are updated and the one or more neighboring CUs 113 update the tracking information. This process repeats each time when there is a change in the NES status and the SSB transmission condition due to at least one of the DU 105, the CU 103 and the one or more neighboring CUs 113.

[0031] FIG. 2 shows an exemplary call flow diagram illustrating triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell, in accordance with some embodiments of the present disclosure.

[0032] At step 1, DU 105 makes an NES decision. At step 2, DU 105 informs the CU 103 with details: Cell ID, SSB Tx Mode, SSB parameters. At step 3, the CU 103 maintains the NES table with Cell ID and SSB Tx Mode. At step 4, the CU 103 informs neighboring CU (CU 113) with Cell ID, SSB Tx Mode, SSB parameters. At step 5, the CU 113 maintains its NES table with Cell ID and SSB Tx Mode. At step 6, the CU 103 triggers OD-SSB using Cause ID, Cell ID (and optional assistance info). At step 7, DU 105 makes another NES decision. At step 8, the DU 105 informs the CU 103 again with Cell ID, SSB Tx Mode, SSB parameters. At step 9, CU 103 updates its NES table. At step 10, the CU 103 informs neighboring CU (CU 113) again, and the CU 113 updates its NES table.

[0033] FIG. 3 shows a flowchart illustrating a method of triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (INES) cell from a neighboring cell, in accordance with some embodiments of the present disclosure.

[0034] As illustrated in FIG. 3, the method 300 may include one or more blocks illustrating a method of triggering On Demand-Synchronization Signal Block (ODSSB) transmission in Network Energy Saving (NES) cell from a neighboring cell. The method 300 may be described in the general context of computer executable instructions. Generally, computer executable instructions can include routines, programs, objects, components, data structures, procedures, modules, and functions, which perform specific functions or implement specific abstract data types.

[0035] The order in which the method 300 is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method. Additionally, individual blocks may be deleted from the methods without departing from the scope of the subject matter described herein. Furthermore, the method can be implemented in any suitable hardware, software, firmware, or combination thereof.

[0036] At block 301, the method 300 includes, receiving resource a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells 107 associated with a Distributed Unit (DU) 105. The notification may include, without limitation, at least one of cell Identifier (ID), SSB transmission mode and SSB parameters.

[0037] At block 303, the method 300 includes, updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification. The information related to Network Energy Saving (NES) status and SSB transmission condition further includes, without limitation, at least one of cell Identifier (ID), SSB transmission mode and SSB parameters.

[0038] At block 305, the method 300 includes, transmitting the updated information to one or more neighboring Centralized Units (CUs) 113 to update tracking information related to the NES status and the SSB transmission condition of the one or more cells. The tracking information may include, without limitation, at least one of cell Identifier (ID), SSB transmission mode, SSB parameters, Hand Over status, feature support for each of the one or more cells. Further, receiving a trigger message from the one or more neighboring CUs 113 for triggering On-Demand SSB (OD-SSB) transmission in at least one cell. The trigger message may include a cause Information Element (IE) and the one or more neighboring CUs 113 select the at least one cell based on the SSB transmission condition. The trigger message may also include an assistance information. Further, transmitting the trigger message to the DU 105 to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message. Thereafter, updating the information related to the NES status and the SSB transmission condition when the DU 105 determines to change the NES status and the SSB transmission condition. Finally, transmitting the updated information to the one or more neighboring CUs 113 to update the tracking information.

[0039] FIG. 4 illustrates an embodiment of an apparatus 400. As shown in FIG. 4, the apparatus 400 comprises a processor 402, a memory 404, a storage component 406, an input component 408, an output component 410, a communication interface 412, and a bus 414. In one embodiment, the apparatus 400, in accordance with various embodiments of the present disclosure, may be implemented as a Centralized Unit.

[0040] The processor 402, as used herein, means any type of computational circuit that may comprise hardware elements and software elements. The processor 402 may be embodied as a multi-core processor, a single core processor, or a combination of one or more multi-core processors and / or one or more single core processors, a distributed processing system, or the like.The processor 402 may be a Central Processing Unit (CPU), a graphics processing unit (GPU), an accelerated processing unit (APU), an application-specific integrated circuit (ASIC), or another type of processing component.

[0041] The memory 404 includes a non-transitory computer readable medium. Memory 404 includes a random-access memory (RAM), a read only memory (ROM), and / or another type of dynamic or static storage device (e.g., a flash memory, a magnetic memory, and / or an optical memory) that stores information and / or instructions for use by processor 402. The memory 404 comprises machine-readable instructions which are executable by the processor 402. These machine-readable instructions when executed by the processor 402 cause the processor 402 to perform one or more method steps of an embodiment described above.

[0042] The storage component 406 stores information and / or software related to the operation and use of the apparatus 400. For example, the storage component 406 may include a hard disk (e.g., a magnetic disk, an optical disk, a magneto-optic disk, and / or a solid-state disk), a compact disc (CD), a digital versatile disc (DVD), a floppy disk, a cartridge, a magnetic tape, and / or another type of non-transitory computer-readable medium, along with a corresponding drive.

[0043] The input component 408 is configured to receive information, such as user input. For example, the input component 408 may include, but not be limited to, a touch screen display, a keyboard, a keypad, a mouse, a button, a switch, and / or a microphone. Additionally, or alternatively, the input component 408 may include a sensor for sensing information (e.g., a global positioning system (GPS), an accelerometer, a gyroscope, and / or an actuator).

[0044] The output component 410 is configured to provide output information from the apparatus 400. For example, the output component 410 may be, but not limited to, a display, a speaker, instructions to an external device, and / or one or more light-emitting diodes (LEDs).

[0045] The communication interface 412 is an interface that provides a communication connection to other devices, such as external devices and internal devices. The connection by the communication interface 412 can be a wired connection, a wireless connection, or a combination of wired and wireless connections, and can be a direct connection or an indirect connection via acommunication network that exists between the apparatus 400 and other devices. In other words, the standard of the communication interface 412 is not limited.

[0046] The bus 414 acts as an interconnect between the processor 402, the memory 404, the storage component 406, the input component 408, the output component 410, and the communication interface 412 of the apparatus 400. The bus 414 may include a wired interconnection or a wireless interconnection.

[0047] The number and arrangement of components shown in FIG. 4 are provided as an example. In practice, the apparatus 400 may include additional components, fewer components, different components, or differently arranged components than those shown in FIG. 4. Additionally, or alternatively, a set of components (e.g., one or more components) of the apparatus may perform one or more functions described as being performed by another set of components of the apparatus 400. Further, one or more method steps described in any of the embodiments may be performed utilizing a plurality of the apparatus 400 in communication with one another.Various Aspects of Embodiments

[0048] Example embodiments introduces new parameters, attributes, mechanisms, and features that supplement and enhance the disclosures of one or more standard specifications. As a nonlimiting example, example embodiments supplement and enhance at least one technical specification associated with the 3 GPP and O-RAN Alliance, as detailed blow (the supplementations and enhancements provided by example embodiments are presented in table and / or bold format).

[0049] The following is a potential addition to #GPP standards.

[0050] Claimable aspects:1. In an embodiment, a method is disclosed in an aspect. The method includes receiving a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU). The method further includes updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification. The method further includes transmittingthe updated information to one or more neighboring Centralized Units (CUs) to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.2. In an embodiment, the method as described in preceding aspect 1, further includes receiving a trigger message from the one or more neighboring CUs for triggering On-Demand SSB (OD-SSB) transmission in at least one cell. The trigger message comprises a cause Information Element (IE). The one or more neighboring CUs select the at least one cell based on the SSB transmission condition. The method further includes transmitting the trigger message to the DU to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message. The method further includes updating the information related to the NES status and the SSB transmission condition when the DU determines to change the NES status and the SSB transmission condition. The method further includes transmitting the updated information to the one or more neighboring CUs to update the tracking information.3. In an embodiment, the method as described in any of preceding aspects 1-2, wherein the trigger message comprises an assistance information.4. In an embodiment, the method as described in any of preceding aspects 1-3, wherein the tracking information comprises at least one of, cell Identifier (ID), SSB transmission mode, SSB parameters, Hand Over status, feature support for each of the one or more cells.5. In an embodiment, the method as described in any of preceding aspects 1-4, wherein the notification comprises at least one of, cell Identifier (ID), SSB transmission mode and SSB parameters.6. In an embodiment, the method as described in any of preceding aspects 1-5, wherein the information related to Network Energy Saving (NES) status and SSB transmission condition further comprises at least one of, cell Identifier (ID), SSB transmission mode and SSB parameters.7. In an embodiment, the method as described in any of preceding aspects 1-6, wherein the notification is received from the DU when the DU updates the NES status and the SSB transmission condition of the one or more cells.8. In an embodiment, a Centralized Unit (CU) is disclosed in an aspect. The Centralized Unit (CU) is configured to receive a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU). Further, the CU is configured to update information related to NetworkEnergy Saving (NES) status and SSB transmission condition based on the notification. Finally, the CU is configured to transmit the updated information to one or more neighboring CUs to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.9. In an embodiment, the CU as described in preceding aspect 8, wherein the CU is further configured to trigger message from the one or more neighboring CUs for triggering On-Demand SSB (OD-SSB) transmission in at least one cell. The trigger message comprises a cause Information Element (IE). The one or more neighboring CUs select the at least one cell based on the SSB transmission condition. Further, the CU is configured to transmit the trigger message to the DU to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message. Further, the CU is configured to update the information related to the NES status and the SSB transmission condition when the DU determines to change the NES status and the SSB transmission condition. Further, the CU is configured to transmit the updated information to the one or more neighboring CUs to update the tracking information.10. In an embodiment, the CU as described in any of preceding aspects 8-9, wherein the trigger message comprises an assistance information.11. In an embodiment, the CU as described in any of preceding aspects 8-10, wherein the tracking information comprises at least one of, cell Identifier (ID), SSB transmission mode, SSB parameters, Hand Over status, feature support for each of the one or more cells.12. In an embodiment, the CU as described in any of preceding aspects 8-11, wherein the notification comprises at least one of, cell Identifier (ID), SSB transmission mode and SSB parameters.13. In an embodiment, the CU as described in any of preceding aspects 8-12, wherein the information related to Network Energy Saving (NES) status and SSB transmission condition further comprises at least one of, cell Identifier (ID), SSB transmission mode and SSB parameters.14. In an embodiment, the CU as described in any of preceding aspects 8-13, wherein the the notification is received from the DU when the DU updates the NES status and the SSB transmission condition of the one or more cells.15. In an embodiment, a non-transitory computer readable medium is disclosed in an aspect. The non-transitory computer readable medium including instructions for performing operations comprising receiving a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU). The operations further includes updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification. The operations further includes transmitting the updated information to one or more neighboring Centralized Units (CUs) to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.16. In an embodiment, the non-transitory computer readable medium as described in preceding aspect 15, further includes receiving a trigger message from the one or more neighboring CUs for triggering On-Demand SSB (OD-SSB) transmission in at least one cell. The trigger message comprises a cause Information Element (IE). The one or more neighboring CUs select the at least one cell based on the SSB transmission condition. The operations further includes transmitting the trigger message to the DU to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message. The operations further includes updating the information related to the NES status and the SSB transmission condition when the DU determines to change the NES status and the SSB transmission condition. The operations further includes transmitting the updated information to the one or more neighboring CUs to update the tracking information.

Claims

We claim:

1. A method comprising:receiving a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU);updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification; andtransmitting the updated information to one or more neighboring Centralized Units (CUs) to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.

2. The method as claimed in claim 1, further comprising:receiving a trigger message from the one or more neighboring CUs for triggering On-Demand SSB (OD-SSB) transmission in at least one cell,wherein the trigger message comprises a cause Information Element (IE), andwherein the one or more neighboring CUs select the at least one cell based on the SSB transmission condition;transmitting the trigger message to the DU to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message;updating the information related to the NES status and the SSB transmission condition when the DU determines to change the NES status and the SSB transmission condition; andtransmitting the updated information to the one or more neighboring CUs to update the tracking information.

3. The method as claimed in claim 2, wherein the trigger message comprises an assistance information.

4. The method as claimed in claim 1, wherein the tracking information comprises at least one of: cell Identifier (ID), SSB transmission mode, SSB parameters, Hand Over status, or feature support for each of the one or more cells.

5. The method as claimed in claim 1, wherein the notification comprises at least one of: cell Identifier (ID), SSB transmission mode or SSB parameters.

6. The method as claimed in claim 1, wherein the information related to Network Energy Saving (NES) status and SSB transmission condition comprises at least one of: cell Identifier (ID), SSB transmission mode or SSB parameters.

7. The method as claimed in claim 1, wherein the notification is received from the DU when the DU updates the NES status and the SSB transmission condition of the one or more cells.

8. A Centralized Unit (CU) configured to:receive a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU);update information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification; andtransmit the updated information to one or more neighboring CUs to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.

9. The CU as claimed in claim 8, wherein the CU is further configured to:receive a trigger message from the one or more neighboring CUs for triggering On- Demand SSB (OD-SSB) transmission in at least one cell,wherein the trigger message comprises a cause Information Element (IE), andwherein the one or more neighboring CUs select the at least one cell based on the SSB transmission condition;transmit the trigger message to the DU to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message;update the information related to the NES status and the SSB transmission condition when the DU determines to change the NES status and the SSB transmission condition; andtransmit the updated information to the one or more neighboring CUs to update the tracking information.

10. The CU as claimed in claim 9, wherein the trigger message comprises an assistance information.

11. The CU as claimed in claim 8, wherein the tracking information comprises at least one of:cell Identifier (ID), SSB transmission mode, SSB parameters, Hand Over status, or feature support for each of the one or more cells.

12. The CU as claimed in claim 8, wherein the notification comprises at least one of: cell Identifier (ID), SSB transmission mode or SSB parameters.

13. The CU as claimed in claim 8, wherein the information related to Network Energy Saving (NES) status and SSB transmission condition comprises at least one of, cell Identifier (ID), SSB transmission mode or SSB parameters.

14. The CU as claimed in claim 8, wherein the notification is received from the DU when the DU updates the NES status and the SSB transmission condition of the one or more cells.

15. A non-transitory computer readable medium including instructions for performing operations comprising:receiving a notification indicating change in Network Energy Saving (NES) status and Synchronization Signal (SSB) transmission condition of one or more cells associated with a Distributed Unit (DU);updating information related to Network Energy Saving (NES) status and SSB transmission condition based on the notification; andtransmitting the updated information to one or more neighboring Centralized Units (CUs) to update tracking information related to the NES status and the SSB transmission condition of the one or more cells.

16. The non-transitory computer readable medium as claimed in claim 13, wherein the operations further comprise:receiving a trigger message from the one or more neighboring CUs for triggering On-Demand SSB (OD-SSB) transmission in at least one cell,wherein the trigger message comprises a cause Information Element (IE), andwherein the one or more neighboring CUs select the at least one cell based on the SSB transmission condition;transmitting the trigger message to the DU to determine whether to change the NES status and the SSB transmission condition of the at least one cell based on the trigger message;updating the information related to the NES status and the SSB transmission condition when the DU determines to change the NES status and the SSB transmission condition; andtransmitting the updated information to the one or more neighboring CUs to update the tracking information.

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