Methods and apparatuses for wake-up signal transmission

Abstract

Disclosed are methods, apparatuses, and systems for communications. One of the methods includes: receiving, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an identifier of the target cell and termination indicator(s) supported by the target cell; receiving, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for the target cell is met; transmitting the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal.

Description

METHODS AND APPARATUSES FOR WAKE-UP SIGNAL TRANSMISSIONCROSS-REFERENCE TO RELATED PATENT APPLICATION

[0001] This application claims the benefit of U.S. Provisional Application No. 63 / 568,856, filed on March 22, 2024, entitled “METHODS AND APPARATUSES FOR WAKE-UP SIGNAL TRANSMISSION,” the entirety of which is incorporated by reference herein.

[0002] Apparatuses and methods consistent with the present disclosure relate generally to communications, more specifically, methods, systems, and devices for wake-up signal transmission in communications.

[0003] As mobile communication continues to advance across various industries with increasing sophistication of services and applications, energy consumption and operational costs of mobile networks raise significant concerns. Implementing network energy savings (NES) in radio access networks presents a promising strategy for reducing the overall energy consumption of mobile networks. A NES cell node is designed to enter a “sleep mode” when it is not actively serving users, especially during low traffic periods, while still maintaining overall network coverage by relying on neighboring active cells. A NES cell node can be activated by a wake-up signal from user equipment (UE) and can transmit system information block (SIB) signals on demand, rather than relying on the traditional method of periodically broadcasting SIB signals. The UE can request the NES cell node for specific system information as needed, instead of receiving it automatically at predetermined intervals. For example, a UE in a radio resource control (RRC) idle state or an RRC inactive state can send a wake-up signal to a NES cell to trigger the NES cell to transmit an on-demand SIB type 1 (SIB1). However, there are challenges in transmitting the wake-up signals for the on-demand SIB signals. For example, when multiple NES cells are present nearby, the UE may not be able to determine which NES cell to be triggered. Also, the UE may not know when to trigger and stop the on-demand SIB transmission. Systems and methods that can efficiently and effectively trigger a specific NES cell and control the timing of on-demand SIB signal transmission are desired.

[0004] According to some embodiments of the present disclosure, there is provided a node for a communication. The node includes a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an identifier (ID) of the target cell and one or more termination indicators supported by the target cell; receive, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for the target cell is met; transmit the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

[0005] According to some embodiments of the present disclosure, there is provided a second node for a second cell for a communication. The second node includes a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a SSB, the SSB including the ID of the second cell; receive, from the first node, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

[0006] According to some embodiments of the present disclosure, there is provided a node for a communication. The node includes a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receive, from the one or more second cells, one or more SSBs, each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmit, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

[0007] According to some embodiments of the present disclosure, there is provided a second node for a second cell in a communication. The second node includes a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a SSB, the SSB including the ID of the second cell; receive, from the first cell, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

[0008] According to some embodiments of the present disclosure, there is provided a cell node for a first cell in a communication. The cell node includes a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from at least one second cell, an ID of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmit, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receive, from the first node, a wake-up signal for the at least one second cell; and transmit, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

[0009] According to some embodiments of the present disclosure, there is provided a method for a node for a communication. The method includes: receiving, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an ID of the target cell and one or more termination indicators supported by the target cell; receiving, from the one or more second cells, one or more SSBs, each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for the target cell is met; transmitting the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0010] According to some embodiments of the present disclosure, there is provided a method for a second node for a second cell in a communication. The method includes: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a SSB, the SSB including the ID of the second cell; receiving, from the first node, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0011] According to some embodiments of the present disclosure, there is provided a method for a node for a communication. The method includes: receiving, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receiving, from the one or more second cells, one or more SSBs, each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmitting, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0012] According to some embodiments of the present disclosure, there is provided a method for a second node for a second cell in a communication. The method includes: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a SSB, the SSB including the ID of the second cell; receiving, from the first cell, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0013] According to some embodiments of the present disclosure, there is provided a method for a cell node for a first cell in a communication. The method includes: receiving, from at least one second cell, an ID of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmitting, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receiving, from the first node, a wake-up signal for the at least one second cell; and transmitting, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

[0014] According to some embodiments of the present disclosure, there is provided a non-transitory computer-readable medium storing instructions that are executable by one or more processors of a node for a communication, to perform a method. The method includes: receiving, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an ID of the target cell and one or more termination indicators supported by the target cell; receiving, from the one or more second cells, one or more SSBs, each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for the target cell is met; transmitting the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0015] According to some embodiments of the present disclosure, there is provided a non-transitory computer-readable medium storing instructions that are executable by one or more processors of a second node for a second cell in a communication, to perform a method. The method includes: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a SSB, the SSB including the ID of the second cell; receiving, from the first node, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0016] According to some embodiments of the present disclosure, there is provided a non-transitory computer-readable medium storing instructions that are executable by one or more processors of a node for a communication, to perform a method. The method includes: receiving, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receiving, from the one or more second cells, one or more SSBs, each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmitting, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0017] According to some embodiments of the present disclosure, there is provided a non-transitory computer-readable medium storing instructions that are executable by one or more processors of a second node for a second cell in a communication, to perform a method. The method includes: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a SSB, the SSB including the ID of the second cell; receiving, from the first cell, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0018] According to some embodiments of the present disclosure, there is provided a non-transitory computer-readable medium storing instructions that are executable by one or more processors of a cell node for a first cell in a communication, to perform a method. The method includes: receiving, from at least one second cell, an ID of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmitting, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receiving, from the first node, a wake-up signal for the at least one second cell; and transmitting, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

[0019] FIG. 1A is a schematic diagram illustrating a first deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art.

[0020] FIG. 1B is a schematic diagram illustrating a second deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art.

[0021] FIG. 1C is a schematic diagram illustrating a third deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art.

[0022] FIG. 1D is a schematic diagram illustrating a fourth deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art.

[0023] FIG. 2 is a schematic diagram illustrating a high-level procedure for on-demand SIB1 provided by a NES cell in the art.

[0024] FIG. 3 is a schematic diagram illustrating a general procedure of on-demand SIB1 triggered by uplink wake-up signal in the art.

[0025] FIG. 4 is a schematic diagram illustrating a procedure for wake-up signal transmission, consistent with some embodiments of the present disclosure.

[0026] FIG. 5 is a schematic diagram illustrating a procedure for wake-up signal transmission, consistent with some embodiments of the present disclosure.

[0027] FIG. 6 is a flow chart illustrating a method for a node for a communication, consistent with some embodiments of the present disclosure.

[0028] FIG. 7 is a flow chart illustrating a method for a second node for a second cell in a communication, consistent with some embodiments of the present disclosure.

[0029] FIG. 8 is a flow chart illustrating a method for a node for a communication, consistent with some embodiments of the present disclosure.

[0030] FIG. 9 is a flow chart illustrating a method for a second node for a second cell in a communication, consistent with some embodiments of the present disclosure.

[0031] FIG. 10 is a flow chart illustrating a method for a cell node for a first cell in a communication, consistent with some embodiments of the present disclosure.

[0032] FIG. 11 is a block diagram of a node for a communication, consistent with some embodiments of the present disclosure.

[0033] Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise represented. The implementations set forth in the following description of exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of systems, apparatuses, and methods consistent with aspects related to the present disclosure as recited in the appended claims.

[0034] In the present disclosure, the term “node” is used as a general term that includes, but is not limited to, UE, one or more vehicles, one or more vehicle mounted modules, and one or more network infrastructure nodes such as base stations, core networks, roadside units, repeaters, transponders, wireless routers, controllers, access points, and sub-systems thereof.

[0035] As mobile communication continues to advance across various industries, the adoption of denser networks, increased antenna deployment, expanded bandwidths, and the use of multiple frequency bands are becoming common practices to facilitate more sophisticated services and applications. Nevertheless, these prevalent methods may lead to heightened energy consumption and operational costs, potentially conflicting with the widely embraced objective of environmental sustainability.

[0036] It has been reported that energy costs in mobile networks may account for approximately 23% of the overall operational expenses of mobile networks. A significant portion of this energy consumption is attributed to radio access networks, for example, active antenna units. Therefore, enhancing network energy savings on radio access networks could play a crucial role in decreasing the overall energy consumption of mobile networks.

[0037] In a 3rd Generation Partnership Project (3GPP) Rel-18 study, based on an agreed base station energy consumption model, and the evaluation methodology and assumptions, potential network energy saving techniques in various domains were evaluated with respect to the energy saving gains and the corresponding performance impact. Additionally, specific key performance indicators (KPIs) such as user perceived throughput (UPT), access delay, UE power consumption were taken into account.

[0038] In the study, some techniques were found beneficial, for example, for RRC connected UEs, user specific signals and channels, and low load scenarios. Other beneficial techniques may include on-demand SSB and on-demand SIB1 transmissions, and adaptation of common signal and / or channel transmissions. At least some embodiments of the present disclosure are directed to on-demand SIB transmissions, for example, for RRC idle / inactive UEs, which align with the new work item on Network Enhancements in 3GPP Release 19. The term “RRC idle / inactive UE” described in the present disclosure may include at least one UE that is in RRC idle state or RRC inactive state.

[0039] FIG. 1A is a schematic diagram illustrating a first deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art. Referring to FIG. 1A, a communication system includes a UE 102, an anchor cell node 104 of a cell 108, and a non-anchor cell node 106 of a non-anchor cell 110. In the present disclosure, the term “anchor cell” may include, but is not limited to, a cell transmitting SIB1 as legacy procedure. A UE may be able to detect and camp to an anchor cell. In the present disclosure, the term “non-anchor cell” may include, but is not limited to, a cell also supporting SIB1-less function apart from legacy SIB1 operation, where the SIB1 information of non-anchor cell can be transmitted either via anchor cell or non-anchor cell based on UE requesting with uplink on-demand signal. The non-anchor cell may be a network energy saving (NES) cell. In FIG. 1A, the UE 102 camps on the anchor cell 108. The UE 102 may be an RRC idle / inactive UE.

[0040] In the scenario shown in FIG. 1A, the anchor cell node 104 may handle the on-demand signal configuration to the UE 102 as well as the on-demand signal reception from the UE 102. In particular, at a step 112, the anchor cell node 104 and the non-anchor cell node 106 exchange on-demand (OD) SIB1 request signal configuration, i.e., wake-up signal configuration related to on-demand (OD) SIB1 requests via backhaul signaling. For example, the non-anchor cell node 106 may send the OD-SIB1 request signal configuration to the anchor cell node 104. At a step 114, the anchor cell node 104 sends the received OD-SIB1 request signal configuration to the UE 102. Based on the OD-SIB1 request signal configuration, at a step 116, the UE 102 send an OD-SIB1 request signal to the anchor cell node 104. Upon reception of the OD-SIB1 request signal, at a step 118, the anchor cell node 104 sends the OD-SIB1 of a corresponding non-anchor cell node 106 to the UE 102. In this way, the anchor cell node 104 handles the on-demand signal configuration to the UE 102 as well as the on-demand signal reception from the UE 102, based on the information exchanged with the non-anchor cell 106 via backhaul signaling. From network energy saving perspective, in this case, the non-anchor cell node 106 could achieve the best network side energy saving performance, where with only the energy required for information exchange of backhaul signaling. This case does not require the UE 102 to switch between anchor cell node 104 and non-anchor cell 106 for acquiring the on-demand SIB1.

[0041] FIG. 1B is a schematic diagram illustrating a second deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art. Referring to FIG. 1B, a communication system includes a UE 120, an anchor cell node 122 of a cell 126, and a non-anchor cell node 124 of a non-anchor cell 128. The non-anchor cell 128 may be a NES cell. The UE 120 camps on the cell 126. The UE 120 may be an RRC idle / inactive UE. In the scenario shown in FIG. 1B, the anchor cell node 122 triggers the non-anchor cell node 124 to send the on-demand SIB1 from the non-anchor cell 124 node, where the anchor cell node 122 handles the on-demand signal configuration to the UE 120 and the on-demand signal reception from the UE 120.

[0042] In particular, at a step 130, the anchor cell node 122 sends OD-SIB1 request signal configuration to the UE 120. Based on the received OD-SIB1 request signal configuration, at a step 132, the UE 120 sends an OD-SIB1 request signal to the anchor cell node 122. Upon reception of the OD-SIB1 request signal, at a step 134, the anchor cell node 122 sends a trigger signal to the non-anchor cell node 124 via backhaul signaling. Upon receipt of the trigger signal, the non-anchor cell node 124 is activated and sends an OD-SIB1 to the UE 120. The deployment in FIG. 1B requires switching of the UE 120 between the anchor cell node 122 and the non-anchor cell node 124 for acquiring the on-demand SIB1.

[0043] FIG. 1C is a schematic diagram illustrating a third deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art. Referring to FIG. 1C, a communication system includes a UE 136, an anchor cell node 138 of a cell 142, and a non-anchor cell node 140 of a non-anchor cell 144. The non-anchor cell 144 may be a NES cell. The UE 136 camps on the cell 142. The UE 136 may be an RRC idle / inactive UE. In the scenario shown in FIG. 1C, the anchor cell node 138 only handles the on-demand signal configuration to the UE 136. The information of on-demand signal configuration may be exchanged via backhaul signaling beforehand for non-collocated cells. The non-anchor cell node 140 handles the on-demand signal reception from the UE 136 and the on-demand SIB1 transmission by itself. In the present disclosure, the term “collocated cells” or “co-located cells” may include, but is not limited to, an anchor cell and a non-anchor cell that share the same cell node (e.g., a gNB), where the information exchange between the two cells is conducted via internal interface. In the present disclosure, the term “non-collocated cells” or “non-co-located cells” may include, but is not limited to, an anchor cell and a non-anchor cell that have different cell nodes (e.g., gNBs), where the information exchange between the two cells is conducted via backhaul interface, e.g., Xn.

[0044] In particular, at a step 146, the anchor cell node 138 and the non-anchor cell node 140 exchange OD SIB1 request signal configuration via backhaul signaling. For example, the non-anchor cell node 140 may send the OD-SIB1 request signal configuration to the anchor cell node 138. At a step 148, the anchor cell node 138 sends the OD-SIB1 request signal configuration to the UE 136. Based on the received OD-SIB1 request signal configuration, at a step 150, the UE 136 sends an OD- SIB1 request signal to the non-anchor cell node 140. Upon reception of the OD-SIB1 request signal, at a step 152, the non-anchor cell node 140 sends an OD-SIB1 to the UE 136. The deployment in FIG. 1C requires the non-anchor cell node 140 to monitor for on-demand signal reception, which increases the energy consumption for the non-anchor cell node 140. The deployment in FIG. 1C also requires switching of the UE 136 between the anchor cell node 138 and the non-anchor cell node 140 for acquiring the on-demand SIB1.

[0045] FIG. 1D is a schematic diagram illustrating a fourth deployment scenario for on-demand SIB1 for RRC idle / inactive UEs in the art. Referring to FIG. 1D, a communication system includes a UE 154, an anchor cell node 156 of a cell 160, and a non-anchor cell node 158 of a non-anchor cell 162. The non-anchor cell 162 may be a NES cell. The UE 154 camps on the cell 160. The UE 154 may be an RRC idle / inactive UE. In the scenario shown in FIG. 1D, the operation of on-demand SIB1 is independent from the anchor cell node 156, where the non-anchor cell node 158 handles the on-demand signal configuration to the UE 154 and the on-demand signal reception from the UE 154. The non-anchor cell node 158 also handles the delivery of on-demand SIB1 to the UE 154.

[0046] In particular, at a step 164, the non-anchor cell node 158 sends the OD-SIB1 request signal configuration to the UE 154. Based on the received OD-SIB1 request signal configuration, at a step 166, the UE 154 sends an OD-SIB1 request signal to the non-anchor cell node 158. Upon reception of the OD-SIB1 request signal, at a step 168, the non-anchor cell node 158 sends an OD-SIB1 to the UE 154. The deployment in FIG. 1D requires a mechanism to point to the UE 154 the on-demand signal. The deployment in FIG. 1D also requires switching of the UE 154 between the anchor cell node 156 and the non-anchor cell node 158 for acquiring the on-demand SIB1.

[0047] Based on the above-described scenarios, at least some embodiments of the present disclosure address several key questions: (1) the method for delivering the configurations of on-demand SIB1 request signal to the UE; (2) the decision regarding whether the UE should send the wake-up signal to the anchor cell or the non-anchor cell; and (3) the decision regarding whether the UE should receive the contents of the on-demand SIB1 from the anchor cell or the non-anchor cell.

[0048] FIG. 2 is a schematic diagram illustrating a high-level procedure 200 for on-demand SIB1 provided by a NES cell in the art. Referring to FIG. 2, a UE 202 is requesting an on-demand SIB1 from a NES cell 206. The UE 202 may be an RRC idle / inactive UE. The UE 202 camps on an anchor cell 204. At a step 208, the anchor cell 204 sends assistance information to the UE 202. In the present disclosure, the terms “cell”, “cell node”, and “node within the cell” are used interchangeably in terms of describing transmission or the reception of signals. For example, the expression that a cell transmits a signal may indicate that a node (e.g., a base station) within the cell transmits the signal. At a step 210, the NES cell 206 sends periodic SSB to the UE 202 so that the UE 202 can monitor uplink wake-up signals (UL-WUS). At a step 212, the NES cell 206 may also send assistance and / or configuration information to the UE 202. For example, the NES cell 206 may send wake-up signal configuration information to the UE 202. At a step 214, the UE 202 sends an uplink wake-up signal to the NES cell 206 to request SIB1. At a step 216, the NES cell 206 sends an acknowledgement to the UE 202 to acknowledge receipt of the uplink wake-up signal. At a step 218, the NES cell 206 sends one or more SIBs to the UE 202. In FIG. 2, it may be more appropriate if the UE 202 sends an uplink wake-up signal to the NES cell directly, which is similar to the third deployment as shown in FIG. 1C, rather than indirectly through the anchor cell 204. Otherwise, there will be more latency and complexity for the network node and the UE 202, if the UE 202 sends the uplink wake-up signal to the anchor cell 204, the network performs required coordination for activating SIB1 on the NES cell 206, and the UE 202 switches to the NES cell 206 to acquire activated SIB1, which is similar to the second deployment as shown in FIG. 1B.

[0049] However, in FIG. 2, there are issues in the procedure that may cause significant overhead in its deployment. These issues may include: (1) the absence of specified details regarding assistance and / or configuration information, particularly in relation to multiple NES cells; and (2) the lack of defined triggering conditions and termination criteria for on-demand SIB1 transmission from NES cell(s).

[0050] FIG. 3 is a schematic diagram illustrating a general procedure 300 of on-demand SIB1 triggered by uplink wake-up signal in the art. Referring to FIG. 3, a UE 302 is requesting an on-demand SIB1 from a NES cell 306. The UE 302 may be an RRC idle / inactive UE. The UE 302 camps on a normal cell 304. In the present disclosure, the term “normal cell” may include, but is not limited to, a cell having normal SIB1 transmission, as opposed to on-demand SIB1 transmission. In the present disclosure, the term “normal cell” and the term “anchor cell” are used interchangeably. The UE 302 is to move to a NES cell 306 which does not have normal SIB1 transmission. The NES cell 306 may represent one or more cells neighboring to the normal cell 304 and are in NES state.

[0051] At a step 308, the normal cell 304 transmits, to the UE 302, wake-up signal (WUS) configuration and measurement configuration of the NES cell 306. At a step 310, the UE 302 performs radio resource management (RRM) measurement on the NES cell 306. At a step 312, the UE determines whether the condition for triggering wake-up signal transmission (Tx) for the NES cell 306 is met. In response to a determination that the condition for triggering wake-up signal transmission is not met, the UE 302 performs the procedure at the step 310. On the other hand, in response to a determination that the condition for triggering wake-up signal transmission is met, at a step 314, the UE 302 prepares wake-up signal transmission for the NES cell 306. At a step 316, the UE 302 transmits an uplink wake-up signal to the NES cell 306 to trigger the SIB1 transmission at the NES cell 306. At a step 318, the NES cell 306 transmits the requested SIB1 to the UE 302. At a step 320, the UE 302 receives the SIB1 by monitoring type 0 physical downlink control channel (PDCCH). At a step 322, after receiving the SIB1 from NES cell 306, the UE 302 determines whether to reselect cell to switch to the NES cell 306. In response to a determination that the cell reselection needs to be performed, at a step 324, the UE 302 camps on the NES cell 306. At a step 326, the NES cell 306 may transmit paging messages if needed. At a step 328, the UE 302 monitors paging messages, and in response to reception of the paging messages, the UE 302 may perform random access channel (RACH) transmissions.

[0052] In FIG. 3, the UE 302 may work well when moving from the normal cell 304 to the NES cell 306. Also, there is no issue on wake-up signal transmission since SSB is still normally sent as timing reference. However, in FIG. 3, there are issues in the procedure that may cause significant overhead in its deployment. These issues include: (1) the absence of specified details regarding assistance and / or configuration information, particularly in relation to multiple NES cells; and (2) the lack of specified triggering conditions and termination criteria for on-demand SIB1 transmission from NES cell(s). At least some embodiments of the present disclosure address the above-noted issues in relation to the first, second, third, and fourth deployments described with respect to FIGs. 1A-1D, as discussed below.

[0053] As discussed above with respect to FIG. 1A, for the first deployment, the SIB1 can be exchanged from the non-anchor cell to the anchor cell via backhaul signaling. In addition, for the first deployment, the anchor cell handles the wake-up signal configuration and the wake-up signal reception from the UE, and the delivery of SIB1 of the non-anchor cell to the UE. One challenge associated with this deployment is the ambiguity surrounding the delivery of SIB1 messages to the UE when multiple non-anchor cells are present. Given that the maximum size for SIB1 or system information (SI) messages is 2976 bits, it remains uncertain which non-anchor cell’s SIB should be delivered to the UE. Another challenge associated with this deployment is the uncertainty regarding when to trigger and stop the on-demand SIB1 exchange and delivery.

[0054] As discussed above with respect to FIG. 1B, for the second deployment, the anchor cell handles the wake-up signal configuration and the wake-up signal reception from the UE. In addition, the anchor cell can trigger the non-anchor cell via backhaul signaling to enable its SIB1 delivery to the UE. One challenge associated with this deployment is the ambiguity surrounding which non-anchor cell is to be triggered when multiple non-anchor cells are present. Another challenge associated with this deployment is the uncertainty regarding when to trigger and stop the on-demand SIB1 delivery.

[0055] As discussed above with respect to FIG. 1C, for the third deployment, the information of the wake-up signal configuration can be exchanged from non-anchor cells to the anchor cell via backhaul signaling. In addition, the anchor cell only handles the wake-up signal configuration to the UE and the non-anchor cell handles the wake-up signal reception from the UE and the delivery of its SIB1 to the UE. One challenge associated with this deployment is multiple wake-up signal configurations of non-anchor cells may be retained on the anchor cell, leading to unnecessary resource consumption. Another challenge associated with this deployment is the uncertainty regarding when to trigger and stop the on-demand SIB1 delivery.

[0056] As discussed above with respect to FIG. 1D, for the fourth deployment, the non-anchor cell handles the wake-up signal configuration and the wake-up signal reception from the UE, and the delivery of its SIB1 to the UE, all of which is independent from that of the anchor cell. One challenge associated with this deployment is that the sole viable solution is to obtain the configuration from previously connected cells; however, this configuration may be rendered invalid due to the unpredictable mobility of the UE in idle or inactive state. Another challenge associated with this deployment is the uncertainty regarding when to trigger and stop the on-demand SIB1 delivery.

[0057] Among the four deployments described with respect to FIGs. 1A-1D, the first deployment may impose significant workloads on the anchor cell and may be infeasible to legacy systems because of constraints on message size. In addition, the fourth deployment functions as a standalone solution, independent from the anchor cell. However, it may be rendered invalid due to the unpredictable mobility of the UE during idle or inactive state. At least some embodiments of the present disclosure address the issues associated with the second deployment and the third deployment. For example, at least some embodiments of the present disclosure take into consideration two key factors: (1) the prior knowledge of which NES cell(s) to be triggered; and (2) the conditions for triggering and terminating on-demand SIB1 from NES cell(s).

[0058] In on-demand SIB1 delivery, the lack of prior knowledge regarding which NES cell(s) to trigger can lead to increased overhead in the setting of wake-up signal configurations for multiple NES cells. To address this issue, in some embodiments of the present disclosure, the determination of which NES cell(s) should transmit the on-demand SIB1 is based on an identifier in the wake-up signal configuration associated with the NES cell(s). For example, physical cell ID (PCI) retrieved in the RRM measurement of the UE during the decoding of the received SSBs from neighboring cells are used as the identifier.

[0059] In some embodiments of the present disclosure, the conditions for triggering and terminating on-demand SIB1 from NES cells are specified. For example, in some embodiments, the identifier in the wake-up signal that is associated with the NES cell(s) is used to prevent false alarms for NES cells. In some embodiments, the behavior patterns of the NES cells are used to dictate the intended wake-up operations of NES cells. For example, in some embodiments, the repetition-based or duration-based behavior patterns of the NES cells are used to dictate the intended wake-up operations of NES cells. In some embodiments, the conditions for triggering and terminating on-demand SIB1 from NES cells are specified by requesting UE. At least some embodiments of the present disclosure provide solutions for designing an efficient and effective wake-up signal configuration that utilizes fewer resources. Additionally, these solutions may prevent false alarms and enable controllable wake-up operations for NES cells.

[0060] FIG. 4 is a schematic diagram illustrating a procedure 400 for wake-up signal transmission, consistent with some embodiments of the present disclosure. Referring to FIG. 4, a UE 402 may be an RRC idle / inactive UE. The UE 402 camps on a normal cell 404. A NES cell 406 represents one or more cells that are neighboring to the normal cell 404 and in NES state. At a step 408, the normal cell 404 and the NES cell 406 exchange cell information using backhaul signaling. For example, a base station within the normal cell 404 and a base station within the NES cell 406 may perform backhaul signaling using Xn interface on the base stations. The NES cell 406 may send an identifier of the NES cell 406 (e.g., PCI), an NES indication, the supported NES behavior, and a specific wake-up signal configuration resource location. The supported NES behavior may include, for example, whether the NES cell 406 supports a termination by repetition, a termination by duration, or a termination by UE. For example, the termination by repetition may be based on a repetition in transmitting signals (e.g., SIB1), or a repetition in receiving signals. The NES cell 406 may decide the termination based on a comparison of a determined repetition value with a threshold repetition value. For example, the NES cell 406 may decide to terminate transmission of the SIB1 signal in response to a determination that the repeated transmission of the SIB1 signals exceeds the threshold value. The termination by duration may be based on a duration of transmitting a type of signals (e.g., SIB1). The NES cell 406 may decide the termination based on a comparison of a determined duration value with a threshold duration value. For example, the NES cell 406 may decide to terminate transmission of the SIB1 signal in response to a determination that a duration of transmitting the SIB1 signals exceeds the threshold value.

[0061] At a step 410, the normal cell 404 sends, to the UE 402, the wake-up signal configuration information on the NES cell 406. For example, the normal cell 404 may include the wake-up signal configuration information on the NES cell 406 in the system information (e.g., SIB1 or any other SIB) broadcasted from the normal cell 404. At a step 412, the UE 402 performs RRM measurement. For example, the UE 402 may measure the quality of the signals received from the serving cell (the normal cell 404) and the neighboring cells (e.g., the NES cell 406). The quality of the signals may include at least one of: a reference signal received power (RSRP), a reference signal received quality (RSRQ), a signal to noise ratio (SNR), or a signal to interreference-plus noise ratio (SINR). At a step 414, the UE 402 receives one or more SSBs from the NES cell 406. Each of the one or more SSBs may include an ID of a corresponding one of the NES cell 406. While the UE 402 performs the regular RRM measurement, it may decode the SSBs received from the NES cell 406 to obtain the PCIs for the cells. The UE 402 then selects at least one NES cell. For example, the UE 402 may select the at least one NES cell based on comparison of the PCIs obtained from decoding the SSBs and the PCI carried in the wake-up signal configuration on the NES cell received from the normal cell 404.

[0062] At a step 416, the UE 402 determines whether the condition for triggering wake-up signal transmission for the NES cell 406 is met. In some embodiments, the UE 402 may determine whether the wake-up signal triggering condition is met based the RRM measurement for both the normal cell 404 and the NES cell 406. For example, the UE 402 may determine that the wake-up signal triggering condition is met when the RSRP and / or SINR measurement from the normal cell 404 is lower than a threshold. The UE 402 may also determine that the wake-up signal triggering condition is met when the RSRP and / or SINR measurement from the NES cell 406 is higher than a threshold. In some embodiments, traffic status may also be used for determining the wake-up signal triggering condition. In response to a determination that the condition for triggering wake-up signal transmission is not met, the UE 402 performs the procedure at the step 412. On the other hand, in response to a determination that the condition for triggering wake-up signal transmission is met, at a step 418, the UE 402 performs the wake-up signal transmission for the NES cell 406. For example, if the triggering conditions for the NES 406 are met, the UE 402 may send a wake-up signal to the specified wake-up signal resource, with other information such as the PCI for the selected at least one NES cell, turn-on indication, and a chosen NES behavior, etc. The wake-up signal resource may include time and / or frequency resources specified for the wake-up signal transmission. The turn-on indication may instruct the selected at least one NES cell to start the SIB1 transmission.

[0063] In some embodiments, the UE 402 may send the wake-up signal with other information via physical random access channel (PRACH). In this case, the other information may be indicated using PRACH preambles. For example, for the chosen NES behavior, different PRACH preambles (e.g., different preamble sequences) are configured for the termination by repetition, the termination by duration, and the termination by UE so that the NES cell 406 may determine a specific NES behavior chosen by the UE 402 based on the PRACH preamble. Similarly, the PCI information can also be indicated by the PRACH preamble configuration. Since the PRACH of the wake-up signal is intended to trigger the transmission of SIB1 from the NES cell 406, not to initiate random access, in some embodiments, the wake-up signal is distinguished from message 1 of the PRACH by time-frequency resources and / or preamble resources. For example, the PRACH of the wake-up signal may use time and / or frequency resources that are different from the legacy PRACH time-frequency resources. In some embodiments, the UE 402 may send the wake-up signal on the legacy PRACH resources and the NES cell 406 may distinguish the wake-up signal from the random access by the preamble sequence of the PRACH.

[0064] At a step 420, based on the PCI indicated by the wake-up signal, at least one of the NES cell 406 with the same PCI may be woken up to transmit SIB1. At a step 422, the UE 402 camps on the at least one NES cell based on the received SIB1. At a step 424, the UE 402 determines whether the NES behavior indicated by the wake-up signal is the termination by UE. If the NES behavior is not the termination by UE, the UE 402 does not transmit any additional wake-up signal, and the SIB1 transmission from the NES cell 406 can be terminated by the NES cell 406 based on the repetition or the duration of the SIB1 transmission. On the other hand, if the NES behavior is the termination by UE, at a step 426, the UE 402 transmits an additional wake-up signal for the at least one NES cell 406. The additional wake-up signal transmission may carry (e.g., by PRACH preamble sequences) a turn-off indication indicating that the at least one NES cell may terminate the SIB1 transmission. The additional wake-up signal transmission may also carry the PCI of the selected at least one NES cell.

[0065] FIG. 5 is a schematic diagram illustrating a procedure 500 for wake-up signal transmission, consistent with some embodiments of the present disclosure. Referring to FIG. 5, a UE 502 may be an RRC idle / inactive UE. The UE 502 camps on a normal cell 504. A NES cell 506 represents one or more cells that are neighboring to the normal cell 504 and in NES state. At a step 508, the normal cell 504 and the NES cell 506 exchange cell information using backhaul signaling. For example, a base station within the normal cell 504 and a base station within the NES cell 506 may perform backhaul signaling using Xn interface on the base stations. For example, the NES cell 506 may send an identifier(s) of the NES cell 506 (e.g., PCI), an NES indication, the supported NES behavior, and a specific wake-up signal configuration resource location. The NES indication may indicate that the cell is in NES state. The supported NES behavior may include, for example, whether the NES cell 506 supports a termination by repetition, a termination by duration, or a termination by UE. For example, the termination by repetition may be based on a repetition in transmitting signals (e.g., SIB1), or a repetition in receiving signals. The NES cell 506 may decide the termination based on a comparison of a determined repetition value with a threshold repetition value. For example, the NES cell 506 may decide to terminate transmission of the SIB1 signal in response to a determination that the repeated transmission of the SIB1 signals exceeds the threshold value. The termination by duration may be based on a duration of transmitting a type of signals (e.g., SIB1). The NES cell 506 may decide the termination based on a comparison of a determined duration value with a threshold value. For example, the NES cell 506 may decide to terminate transmission of the SIB1 signal in response to a determination that a duration of transmitting the SIB1 signals exceeds the threshold value.

[0066] At a step 510, the normal cell 504 sends, to the UE 502, the wake-up signal configuration information on the normal cell 504. For example, the normal cell 504 may include the wake-up signal configuration information on the normal cell 504 in the system information (e.g., SIB1 or any other SIB) broadcasted from the normal cell 504. At a step 512, the UE 502 performs RRM measurement. For example, the UE 502 may measure the quality of the signals received from the serving cell (the normal cell 504) and the neighboring cells (e.g., the NES cell 506). The quality of the signals may include at least one of: a RSRP, a RSRQ, a SNR, or a SINR. At a step 514, the UE 502 receives one or more SSBs from the NES cell 506. Each of the one or more SSBs may include an ID of a corresponding one of the NES cell 506. While the UE 502 performs the regular RRM measurement, it may decode the SSBs received from the NES cell 506 to obtain the PCIs for the cells. The UE 502 then selects at least one NES cell based on the PCIs obtained from decoding the SSBs.

[0067] At a step 516, the UE 502 determines whether the condition for triggering wake-up signal transmission for the NES cell 506 is met. In some embodiments, the UE 502 may determine whether the wake-up signal triggering condition is met based the RRM measurement for both the normal cell 504 and the NES cell 506. For example, the UE 502 may determine that the wake-up signal triggering condition is met when the RSRP and / or SINR measurement from the normal cell 504 is lower than a threshold. The UE 502 may also determine that the triggering condition is met when and the RSRP and / or SINR measurement from the NES cell 506 is higher than a threshold. In some embodiments, traffic status may also be used for determining the wake-up signal triggering condition. In response to a determination that the condition for triggering wake-up signal transmission is not met, the UE 502 performs the procedure at the step 512. On the other hand, in response to a determination that the condition for triggering wake-up signal transmission is met, at a step 518, the UE 502 sends, to the normal cell 504, the wake-up signal for the selected at least one NES cell. The UE 502 may send the wake-up signal using specified wake-up signal resources, with other information such as the PCI for the selected at least one NES cell, turn-on indication, and a chosen NES behavior, etc. The turn-on indication may instruct the selected at least one NES cell to start the SIB1 transmission.

[0068] In some embodiments, the UE 502 may send the wake-up signal with other information to the normal cell 504 via PRACH. In this case, the other information may be indicated using PRACH preambles. For example, in some embodiments, for the chosen NES behavior, different PRACH preambles (e.g., different preamble sequences) are configured for different NES behaviors (the termination by repetition, the termination by duration, and the termination by UE). Similarly, the PCI information can also be carried by the PRACH preamble configuration. Since the PRACH of the wake-up signal is intended to trigger the transmission of SIB1 from the selected at least one NES cell, instead of initiating random access, in some embodiments, the wake-up signal is distinguished from message 1 of the PRACH by time-frequency resources and / or preamble resources. For example, the PRACH of the wake-up signal may use time and / or frequency resources that are different from the legacy PRACH time-frequency resources. In some embodiments, the UE 502 may send the wake-up signal on the legacy PRACH resources and the normal cell 504 may distinguish the wake-up signal from the random access by the preamble sequence of the PRACH.

[0069] At a step 520, the normal cell 504 sends, to the selected at least one NES cell, a wake-up signal corresponding to the wake-up signal received from the UE 502. The wake-up signal transmitted from the normal cell 504 carries (e.g., via PRACH preamble sequences) the information on the PCI, the turn-on indication, and the chosen NES behavior that is carried by the wake-up signal received from the UE 502. At a step 522, based on the PCI carried by the wake-up signal transmitted from the normal cell 504, the at least one NES cell with the same PCI may be woken up to transmit SIB1. At a step 524, the UE 502 camps on the at least one NES cell based on the received SIB1. At a step 526, the UE 502 determines whether the NES behavior carried by the wake-up signal sent to the normal cell 504 is the termination by UE. If the NES behavior is not the termination by UE, the UE 502 does not transmit any additional WUS, and the SIB1 transmission from the at least one NES cell may be terminated by the NES cell based on the repetition or the duration of the SIB1 transmission. On the other hand, if the NES behavior is the termination by UE, at a step 528, the UE 502 transmits, to the normal cell 504, an additional wake-up signal for the at least one NES cell. The additional wake-up signal transmission may carry a turn-off indication indicating that the at least one NES cell may terminate the SIB1 transmission. The additional wake-up signal transmission may also carry the PCI of the selected at least one NES cell. Upon receiving the additional wake-up signal, at a step 530, the normal cell 504 transmits a wake-up signal corresponding to the additional wake-up signal received from the UE 502. The wake-up signal transmitted from the normal cell 504 may include the PCI and the turn-off indication indicating that the at least one NES cell may terminate the SIB1 transmission. Upon receiving the additional wake-up signal from the normal cell 504, the at least one NES cell may terminate the SIB1 transmission.

[0070] FIG. 6 is a flow chart illustrating a method 600 for a node for a communication, consistent with some embodiments of the present disclosure. The node may be a UE, such as the UE 402 of FIG. 4. The node may camp on a first cell, such as the normal cell 404 of FIG. 4.

[0071] Referring to FIG. 6, the method 600 includes a step 602 of receiving, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an ID of the target cell and one or more termination indicators supported by the target cell. The one or more second cells may be one or more NES cells, such as the NES cell 406 of FIG. 4. The ID of the target cell may be the PCI of the target cell. For example, as shown in FIG. 4, the UE 402 receives, from the normal cell 404, the wake-up signal configuration information for at least one cell among one or more NES cells indicated as the NES cell 406. The one or more termination indicators supported by the target cell may include at least one of: a termination by repetition, a termination by duration, or a termination by UE. In some embodiments, the wake-up signal configuration information is received via one or more SIB signals (e.g., SIB1) broadcasted from the first cell.

[0072] The method 600 includes a step 604 of receiving, from the one or more second cells, one or more SSBs, each of the one or more SSBs including an ID of a corresponding one of the one or more second cells. For example, as shown in FIG. 4, while performing a regular RRM measurement, the UE 402 may receive SSBs from the NES cell 406 and decode the received one or more SSBs to obtain one or more IDs corresponding to the one or more NES cells.

[0073] The method 600 includes a step 606 of determining whether a condition for triggering a wake-up signal for the target cell is met. The determining whether condition for triggering the wake-up signal for the target cell is met may include identifying the target cell based on one or more IDs corresponding to the one or more second cells and the ID of the target cell received from the first cell. In some embodiments, determining whether condition for triggering the wake-up signal for the target cell is met may also include comparing one or more signal quality parameters (e.g. RSRP, SINR) of the first cell and the second cell with a corresponding threshold value. For example, in some embodiments, condition for triggering the wake-up signal for the target cell is met when the RSRP and / or SINR for the first cell is lower than a threshold, and the RSRP and / or SINR for the target cell is higher than a threshold. In some embodiments, traffic status may also be used for determining whether the condition for triggering the wake-up signal for the target cell is met.

[0074] The method 600 includes a step 608 of transmitting the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met. In some embodiments, the wake-up signal configuration information for the target cell may include one or more wake-up signal resources specified for the target cell, and transmitting the wake-up signal is based on the one or more wake-up signal resources specified for the target cell. The one or more wake-up signal resources specified for the target cell may include at least one of: a type of channel to be used for transmission of the wake-up signal, a time resource for transmission of the wake-up signal, or a frequency resource for transmission of the wake-up signal. In some embodiments, the wake-up signal may be transmitted to the target cell via a PRACH.

[0075] The method 600 includes a step 610 of receiving, from the target cell, a response signal as a response to the wake-up signal. In some embodiments, the response signal may include a SIB1 signal. The transmission of the response signal from the target cell may be terminated based on a determination that a termination indicator indicated by the wake-up signal is the termination by repetition or the termination by duration.

[0076] The method 600 includes a step 612 of initiating connection with the target cell based on the response signal received from the target cell. For example, as shown in FIG. 4, the UE 402 may camp on one of the target NES cell.

[0077] In some embodiments, the wake-up signal is a first wake-up signal, and the method 600 may further include transmitting, to the target cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE. The second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal. The second wake-up signal may be transmitted to the target cell via a PRACH.

[0078] FIG. 7 is a flow chart illustrating a method 700 for a second node for a second cell in a communication, consistent with some embodiments of the present disclosure. The second cell may be a NES cell.

[0079] Referring to FIG. 7, the method 700 includes a step 702 of transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell. The second node may include at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a UE within the second cell. The first cell may include at least one anchor cell. The one or more termination indicators may include at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0080] The method 700 includes a step 704 of transmitting, to a first node, a SSB, the SSB including the ID of the second cell. The first node may include at least one UE that camps on the first cell. For example, as shown in FIG. 4, the NES cell 406 transmits, to the UE 402, a SSB, in which the SSB includes the ID of the NES cell 406.

[0081] The method 700 includes a step 706 of receiving, from the first node, a wake-up signal. For example, as shown in FIG. 4, the NES cell 406 receives a wake-up signal from the UE 402. The wake-up signal may be received via a PRACH. The second node may be woken up to transmit the response signal based on the wake-up signal.

[0082] The method 700 includes a step 708 of transmitting, to the first node, a response signal as a response to the wake-up signal. In some embodiments, the response signal may include a SIB1 signal. In some embodiments, the method 700 may further include terminating transmission of the response signal to the first node, based on a determination that a termination indicator indicated by the wake-up signal comprises the termination by repetition or the termination by duration. For example, the second node may terminate the response signal transmission based on a comparison of the repetition number of the transmission or the duration of the transmission with a corresponding threshold. If the repetition number of the transmission or the duration of the transmission exceeds the corresponding threshold, the second node may terminate the response signal transmission.

[0083] In some embodiments, the wake-up signal is a first wake-up signal, and the method 700 may further include awaiting, from the first node, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE. In this case, the first node, rather than the second node decides when to terminate the response signal transmission. The method may further include receiving, from the first node, the second wake-up signal; and terminating transmitting the response signal in response to a determination that the second wake-up signal indicates a turn-off indication. The second wake-up signal may be received via a PRACH.

[0084] FIG. 8 is a flow chart illustrating a method 800 for a node for a communication, consistent with some embodiments of the present disclosure. The node may be a UE, such as the UE 502 of FIG. 5. The node may camp on a first cell, such as the cell 504 of FIG. 5.

[0085] Referring to FIG. 8, the method 800 includes a step 802 of receiving, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells. The one or more second cells may be one or more NES cells, such as the NES cell 506 of FIG. 5. For example, as shown in FIG. 5, the UE 502 receives, from the normal cell 504, the wake-up signal configuration information for the normal cell 504. The one or more termination indicators supported by the target cell may include at least one of: a termination by repetition, a termination by duration, or a termination by UE. In some embodiments, the wake-up signal configuration information is received via one or more SIB signals (e.g., SIB1) broadcasted from the first cell. In some embodiments, the wake-up signal configuration information may also include an ID of a target cell among the one or more second cells.

[0086] The method 800 includes a step 804 of receiving, from the one or more second cells, one or more SSBs, each of the one or more SSBs including an ID of a corresponding one of the one or more second cells. For example, as shown in FIG. 5, while performing the regular RRM measurement, the UE 502 may receive SSBs from the NES cell 506 and decode the received one or more SSBs to obtain one or more IDs corresponding to the one or more NES cells.

[0087] The method 800 includes a step 806 of determining whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met. In some embodiments, determining whether condition for triggering the wake-up signal for the target cell is met may also include comparing one or more signal quality parameters (e.g. RSRP, SINR) of the first cell and the second cell with a corresponding threshold value. For example, in some embodiments, condition for triggering the wake-up signal for the target cell is met when the RSRP and / or SINR for the first cell is lower than a threshold, and the RSRP and / or SINR for the target cell is higher than a threshold. In some embodiments, traffic status may also be used for determining whether the condition for triggering the wake-up signal for the target cell is met.

[0088] The method 800 includes a step 808 of transmitting, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met. Upon receipt of the wake-up signal for the target cell, the first cell may transmit, to the target cell, a wake-up signal corresponding to the wake-up signal received from the first node. The wake-up signal for the target cell may be transmitted to the first cell via a PRACH.

[0089] The method 800 includes a step 810 of receiving, from the target cell, a response signal as a response to the wake-up signal. In some embodiments, the response signal may include a SIB1 signal. In some embodiments, the transmission of the response signal from the target cell may be terminated based on a determination that a termination indicator indicated by the wake-up signal is the termination by repetition or the termination by duration. In some embodiments, the termination indicator may be indicated by the preambles (e.g., the preamble sequences) of the PRACH transmitted from the first cell.

[0090] The method 800 includes a step 812 of initiating connection with the target cell based on the response signal received from the target cell. For example, as shown in FIG. 5, the UE 502 may camp on one of the target NES cell.

[0091] In some embodiments, the wake-up signal is a first wake-up signal, and the method 800 may further include transmitting, to the first cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE. The second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal. The second wake-up signal may be transmitted to the first cell via a PRACH.

[0092] FIG. 9 is a flow chart illustrating a method 900 for a second node for a second cell in a communication, consistent with some embodiments of the present disclosure. The second cell may be a NES cell, such as the NES cell 506 of FIG. 5. The second node may be a cell node for the NES cell.

[0093] Referring to FIG. 9, the method 900 includes a step 902 of transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an ID of the second cell and one or more termination indicators supported by the second cell. The second node may include at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a UE within the second cell. The first cell may include at least one anchor cell, such as the normal cell 504 of FIG. 5. The one or more termination indicators may include at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0094] The method 900 includes a step 904 of transmitting, to a first node, a SSB, the SSB including the ID of the second cell. The first node may include at least one UE that camps on the first cell. For example, as shown in FIG. 5, the NES cell 506 transmits, to the UE 502, a SSB, in which the SSB includes the ID of the NES cell 506.

[0095] The method 900 includes a step 906 of receiving, from the first cell, a wake-up signal. For example, as shown in FIG. 5, the NES cell 506 receives a wake-up signal from the normal cell 504. The wake-up signal may be received via a Xn interface between the NES cell 506 and the normal cell 504. The second node may be woken up to transmit the response signal based on the wake-up signal.

[0096] The method 900 includes a step 908 of transmitting, to the first node, a response signal as a response to the wake-up signal. In some embodiments, the response signal may include a SIB1 signal. In some embodiments, the method 900 may further include terminating transmission of the response signal to the first node, based on a determination that a termination indicator indicated by the wake-up signal comprises the termination by repetition or the termination by duration. For example, the second node may terminate the response signal transmission based on a comparison of the repetition number of the transmission or the duration of the transmission with a corresponding threshold. If the repetition number of the transmission or the duration of the transmission exceeds the corresponding threshold, the second node may terminate the response signal transmission.

[0097] In some embodiments, the wake-up signal is a first wake-up signal, and the method 900 may further include awaiting, from the first cell, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE. In this case, the first node (via the first cell), rather than the second node decides when to terminate the response signal transmission. The method may further include receiving, from the first cell, the second wake-up signal; and terminating transmitting the response signal in response to a determination that the second wake-up signal indicates a turn-off indication. The second wake-up signal may be received via a Xn interface between the first cell and the second cell.

[0098] FIG. 10 is a flow chart illustrating a method 1000 for a cell node for a first cell in a communication, consistent with some embodiments of the present disclosure. The first cell may be an anchor cell, such as the normal cell 504 of FIG. 5. The cell node may include at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a UE within the second cell.

[0099] Referring to FIG. 10, the method 1000 includes a step 1002 of receiving, from at least one second cell, an ID of the at least one second cell and one or more termination indicators supported by the at least one second cell. The at least one second cell may include at least one NES cell. The one or more termination indicators may include at least one of: a termination by repetition, a termination by duration, or a termination by UE. For example, as shown in FIG. 5, the normal cell 504 receives, from the NES cell 506, an ID of the NES cell and one or more termination indicators supported by the NES cell.

[0100] The method 1000 includes a step 1004 of transmitting, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell. The first node may include at least one UE that camps on the first cell. For example, as shown in FIG. 5, the normal cell 504 transmits, to the UE 502, the wake-up signal configuration information for the normal cell 504.

[0101] The method 1000 includes a step 1006 of receiving, from the first node, a wake-up signal for the at least one second cell. For example, as shown in FIG. 5, the normal cell 504 receives, from the UE 502, a wake-up signal for the NES cell 506. The wake-up signal may be received via a PRACH. The preamble of the PRACH may indicate other information, for example, the ID of the at least one second cell, the NES behavior, and turn-on indication indicating the second cell to initiate transmission of a response signal (e.g., SIB), etc.

[0102] The method 1000 includes a step 1008 of transmitting, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node. The at least one second cell may be woken up to transmit the response signal to the first node based on the wake-up signal transmitted from the cell node.

[0103] In some embodiments, the wake-up signal is a first wake-up signal, and the method 1000 may further include awaiting, from the first node, a second wake-up signal for the at least one second cell, in response to a determination that the first wake-up signal received from the first node indicates the termination by UE. In this case, the first node (via the first cell), rather than the second cell decides when to terminate the response signal transmission. The method may further include receiving, from the first node, the second wake-up signal; and transmitting, to the at least one second cell, a wake-up signal corresponding to the second wake-up signal received from the first node. The wake-up signal corresponding to the second wake-up signal may be transmitted via a PRACH.

[0104] FIG. 11 is a block diagram of a node 1100, consistent with some embodiments of the present disclosure. In some embodiments, the node 1100 may be a node (e.g., a UE) that sends wake-up signals to NES cells. For example, the node 1100 may be the UE 402 of FIG. 4, or the UE 502 of FIG. 5. In some embodiments, the node 1100 may be a cell node of a NES cell that receives a wake-up signal from a UE and sends a response signal (e.g., SIB1). For example, the node 1100 may be the NES cell 406 of FIG. 4, or the NES cell 506 of FIG. 5 (the “cell node” and “cell” are used interchangeably). In some embodiments, the node 1100 may be a cell node of an anchor cell. For example, the node 1100 may be the normal cell 404 of FIG. 4, or the normal cell 504 of FIG. 5. In some embodiments, the node 1100 may be a node that performs the method 600 of FIG. 6, the method 700 of FIG. 7, the method 800 of FIG. 8, the method 900 of FIG. 9, or the method 1000 of FIG. 10. The node 1100 may take any form, including but not limited to, a computer, a system including at least one computer, a vehicle, a component mounted in a vehicle, a portable computer, a wireless terminal including a mobile phone, a wireless handheld device, or wireless personal device, or any other form.

[0105] Referring to FIG. 11, the node 1100 may include antenna 1102 that may be used for transmission or reception of electromagnetic signals to / from one or more other nodes. The antenna 1102 may include one or more antenna elements and may enable different input-output antenna configurations, for example, multiple input multiple output (MIMO) configuration, multiple input single output (MISO) configuration, and single input multiple output (SIMO) configuration. In some embodiments, the antenna 1102 may include multiple (e.g., tens or hundreds) antenna elements and may enable multi-antenna functions such as beamforming. In some embodiments, the antenna 1102 is a single antenna.

[0106] The node 1100 may include a transceiver 1104 that is coupled to the antenna 1102. The transceiver 1104 may be a wireless transceiver at the node 1100 and may communicate bi-directionally with one or more other nodes. For example, the transceiver 1104 may receive / transmit wireless signals from / to a base station via downlink / uplink communication. The transceiver 1104 may also receive / transmit wireless signals from / to another node unit via sidelink communication. The transceiver 1104 may include a modem to modulate the packets and provide the modulated packets to the antenna 1102 for transmission, and to demodulate packets received from the antenna 1102.

[0107] The node 1100 may include a memory 1106. The memory 1106 may be any type of computer-readable storage medium including volatile or non-volatile memory devices, or a combination thereof. The computer-readable storage medium includes, but is not limited to, non-transitory computer storage media. A non-transitory storage medium may be accessed by a general purpose or special purpose computer. Examples of non-transitory storage medium include, but are not limited to, a portable computer diskette, a hard disk, random access memory (RAM), read-only memory (ROM), an erasable programmable read-only memory (EPROM), electrically erasable programmable ROM (EEPROM), a digital versatile disk (DVD), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, etc. A non-transitory medium may be used to carry or store desired program code means (e.g., instructions and / or data structures) and may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. In some examples, the software / program code may be transmitted from a remote source (e.g., a website, a server, etc.) using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave. In such examples, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are within the scope of the definition of medium. The memory 1106 may also be a cloud-based remote memory device. Combinations of the above examples are also within the scope of computer-readable medium.

[0108] The memory 1106 may store information related to identities (e.g., PCI) of node 1100 and the signals and / or data received by antenna 1102. The memory 1106 may also store post-processing signals and / or data. The memory 1106 may also store computer-readable program instructions, mathematical models, and algorithms that are used in signal processing in receiver 1104 and computations in a processor 1108 of the node 1100. The memory 1106 may further store computer-readable program instructions for execution by processor 1108 to operate the node 1100 to perform various functions described in this disclosure. The memory may further store wake-up signal configuration information, supported NES behavior, etc. In some examples, the memory 1106 may include a basic input / output system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

[0109] The computer-readable program instructions of the present disclosure may be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or source code or object code written in any combination of one or more programming languages, including an object-oriented programming language, and conventional procedural programming languages. The computer-readable program instructions may execute entirely on a computing device as a stand-alone software package, or partly on a first computing device and partly on a second computing device remote from the first computing device. In the latter scenario, the second, remote computing device may be connected to the first computing device through any type of network, including a local area network (LAN) or a wide area network (WAN).

[0110] The processor 1108 may include a hardware device with processing capabilities. The processor 1108 may include at least one of a general-purpose processor, a digital signal processor (DSP), a central processing unit (CPU), a graphical processing unit (GPU), a microcontroller, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or other programmable logic device. Examples of the general-purpose processor include, but are not limited to, a microprocessor, any conventional processor, a controller, a microcontroller, or a state machine. In some embodiments, the processor 1108 may be implemented using a combination of devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration). The processor 1108 may receive, from transceiver 1104, downlink signals or sidelink signals and further process the signals. The processor 1108 may also receive, from transceiver 1104, data packets and further process the packets. In some embodiments, the processor 1108 may be configured to operate a memory using a memory controller. In some embodiments, a memory controller may be integrated into the processor 1108. The processor 1108 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1106) to cause the node 1100 to perform various functions.

[0111] The node 1100 may include a global positioning system (GPS) 1110. The GPS 1110 may be used for enabling location-based services or other services based on a geographical position of the node 1100 and / or synchronization among nodes. The GPS 1110 may receive global navigation satellite systems (GNSS) signals from a single satellite or a plurality of satellite signals via the antenna 1102 and provide a geographical position of the node 1100 (e.g., coordinates of the node 1100). In some embodiments, the GPS 1110 is omitted. In some embodiments, a timer is included.

[0112] The node 1100 may include an input / output (I / O) device 1112 that may be used to communicate a result of signal processing and computation to a user or another device. The I / O device 1112 may include a user interface including a display and an input device to transmit a user command to processor 1108. The display may be configured to display a status of signal reception at the node 1100, the data stored at memory 1106, a status of signal processing, and a result of computation, etc. The display may include, but is not limited to, a cathode ray tube (CRT), a liquid crystal display (LCD), a light-emitting diode (LED), a gas plasma display, a touch screen, or other image projection devices for displaying information to a user. The input device may be any type of computer hardware equipment used to receive data and control signals from a user. The input device may include, but is not limited to, a keyboard, a mouse, a scanner, a digital camera, a joystick, a trackball, cursor direction keys, a touchscreen monitor, or audio / video commanders, etc.

[0113] The node 1100 may further include a machine interface 1114, such as an electrical bus that connects the transceiver 1104, the memory 1106, the processor 1108, the GPS 1110, and the I / O device 1112.

[0114] In some embodiments, the node 1100 may be a node for a communication. The processor 1108 may be configured or programmed to execute the instructions stored in the memory 1106 to receive, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an identifier (ID) of the target cell and one or more termination indicators supported by the target cell; receive, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for the target cell is met; transmit the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

[0115] In some embodiments, the node 1100 may be a second node for a communication. The processor 1108 may be configured or programmed to execute the instructions stored in the memory 1106 to transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receive, from the first node, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

[0116] In some embodiments, the node 1100 may be a node for a communication. The processor 1108 may be configured or programmed to execute the instructions stored in the memory 1106 to receive, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receive, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an identifier (ID) of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmit, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

[0117] In some embodiments, the node 1100 may be a second node for a second cell in a communication. The processor 1108 may be configured or programmed to execute the instructions stored in the memory 1106 to transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receive, from the first cell, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

[0118] In some embodiments, the node 1100 may be a cell node for a first cell in a communication. The processor 1108 may be configured or programmed to execute the instructions stored in the memory 1106 to receive, from at least one second cell, an identifier (ID) of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmit, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receive, from the first node, a wake-up signal for the at least one second cell; and transmit, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

[0119] The methods described in the present disclosure can be applied to any wireless communication system that makes use of wake-up signal, for example, but not limited to, terrestrial and non-terrestrial mobile radio communication systems, such as 3GPP LTE and / or NR and / or any future radio access technology, where wake-up signal transitions are desired and / or needed.

[0120] While the examples in this disclosure relate to 3GPP technologies, embodiments described in this disclosure could be used for non-3GPP technologies, for example, IEEE and its 802.11 variants, Wi-Fi, WiMAX, etc.

[0121] As used in this disclosure, use of the term “or” in a list of items indicates an inclusive list. The list of items may be prefaced by a phrase such as “at least one of” or “one or more of.” For example, a list of at least one of A, B, or C includes A or B or C or AB (i.e., A and B) or AC or BC or ABC (i.e., A and B and C). Also, as used in this disclosure, prefacing a list of conditions with the phrase “based on” shall not be construed as “based only on” the set of conditions and rather shall be construed as “based at least in part on” the set of conditions. For example, an outcome described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of this disclosure.

[0122] In this specification, the terms “comprise,” “include,” or “contain” may be used interchangeably and have the same meaning and are to be construed as inclusive and open-ended. The terms “comprise,” “include,” or “contain” may be used before a list of elements and indicate that at least all of the listed elements within the list exist but other elements that are not in the list may also be present. For example, if A comprises B and C, both {B, C} and {B, C, D} are within the scope of A.

[0123] The present disclosure, in connection with the accompanied drawings, describes example configurations that are not representative of all the examples that may be implemented or all configurations that are within the scope of this disclosure. The term “exemplary” should not be construed as “preferred” or “advantageous compared to other examples” but rather “an illustration, an instance or an example.” By reading this disclosure, including the description of the embodiments and the drawings, it will be appreciated by a person of ordinary skills in the art that the technology disclosed herein may be implemented using alternative embodiments. The person of ordinary skill in the art would appreciate that the embodiments, or certain features of the embodiments described herein, may be combined to arrive at yet other embodiments for practicing the technology described in the present disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

[0124] The flowcharts and block diagrams in the figures illustrate examples of the architecture, functionality, and operation of possible implementations of systems, methods, and devices according to various embodiments. It should be noted that, in some alternative implementations, the functions noted in blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Likewise, additional steps may be included in such methods, and certain steps may be omitted or combined, in methods consistent with various embodiments.

[0125] It is understood that the described embodiments are not mutually exclusive, and elements, components, materials, or steps described in connection with one example embodiment may be combined with, or eliminated from, other embodiments in suitable ways to accomplish desired design objectives.

[0126] Reference herein to “some embodiments” or “some exemplary embodiments” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment. The appearance of the phrases “one embodiment” “some embodiments” or “another embodiment” in various places in the present disclosure do not all necessarily refer to the same embodiment, nor are separate or alternative embodiments necessarily mutually exclusive of other embodiments.

[0127] Additionally, the articles “a” and “an” as used in the present disclosure and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from context to be directed to a singular form.

[0128] Unless explicitly stated otherwise, each numerical value and range should be interpreted as being approximate as if the word “about” or “approximately” preceded the value of the value or range.

[0129] Although the elements in the following method claims, if any, are recited in a particular sequence, unless the claim recitations otherwise imply a particular sequence for implementing some or all of those elements, those elements are not necessarily intended to be limited to being implemented in that particular sequence.

[0130] It is appreciated that certain features of the present disclosure, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the specification, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination or as suitable in any other described embodiment of the specification. Certain features described in the context of various embodiments are not essential features of those embodiments, unless noted as such.

[0131] It will be further understood that various modifications, alternatives, and variations in the details, materials, and arrangements of the parts which have been described and illustrated in order to explain the nature of described embodiments may be made by those skilled in the art without departing from the scope. Accordingly, the following claims embrace all such alternatives, modifications, and variations that fall within the terms of the claims.

[0132] Clause 1: A node for a communication, the node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an identifier (ID) of the target cell and one or more termination indicators supported by the target cell; receive, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for the target cell is met; transmit the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

[0133] Clause 2: The node of clause 1, wherein the node comprises at least one user equipment (UE) that camps on the first cell.

[0134] Clause 3: The node of clause 1, wherein the one or more second cells comprise one or more network energy saving (NES) cells.

[0135] Clause 4: The node of clause 1, wherein the first cell comprises at least one anchor cell.

[0136] Clause 5: The node of clause 1, wherein the target cell is woken up to transmit the response signal based on the wake-up signal.

[0137] Clause 6: The node of clause 1, wherein the processor is configured to execute the instruction stored in the memory to: perform a radio resource management (RRM) measurement; and decode the one or more SSBs received from the one or more second cells to obtain one or more IDs corresponding to the one or more second cells.

[0138] Clause 7: The node of clause 1, wherein determining whether the condition for triggering the wake-up signal for the target cell is met comprises identifying the target cell based on one or more IDs corresponding to the one or more second cells and the ID of the target cell received from the first cell.

[0139] Clause 8: The node of clause 1, wherein the wake-up signal configuration information for the target cell comprises one or more wake-up signal resources specified for the target cell, and the processor is configured to execute the instruction stored in the memory to: transmit the wake-up signal based on the one or more wake-up signal resources specified for the target cell.

[0140] Clause 9: The node of clause 8, wherein the one or more wake-up signal resources specified for the target cell comprise at least one of: a type of channel to be used for transmission of the wake-up signal, a time resource for transmission of the wake-up signal, or a frequency resource for transmission of the wake-up signal.

[0141] Clause 10: The node of clause 1, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0142] Clause 11: The node of clause 1, wherein the wake-up signal is transmitted to the target cell via a physical random access channel (PRACH).

[0143] Clause 12: The node of clause 1, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0144] Clause 13: The node of clause 12, wherein transmission of the response signal from the target cell is terminated based on a determination that a termination indicator indicated by the wake-up signal is the termination by repetition or the termination by duration.

[0145] Clause 14: The node of clause 12, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: transmit, to the target cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE, wherein the second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal.

[0146] Clause 15: The node of clause 14, wherein the second wake-up signal is transmitted to the target cell via a PRACH.

[0147] Clause 16: The node of clause 11, wherein the wake-up signal configuration information is received via one or more SIB signals broadcasted from the first cell.

[0148] Clause 17: A second node for a second cell in a communication, the second node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receive, from the first node, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

[0149] Clause 18: The second node of clause 17, wherein the second cell comprises at least one network energy saving (NES) cell.

[0150] Clause 19: The second node of clause 17, wherein the first cell comprises at least one anchor cell.

[0151] Clause 20: The second node of clause 17, wherein the second node comprises at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a user equipment (UE) within the second cell.

[0152] Clause 21: The second node of clause 17, wherein the first node comprises at least one UE that camps on the first cell.

[0153] Clause 22: The second node of clause 17, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0154] Clause 23: The second node of clause 17, wherein the second node is woken up to transmit the response signal based on the wake-up signal.

[0155] Clause 24: The second node of clause 17, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0156] Clause 25: The second node of clause 24, wherein the processor is configured to execute the instruction stored in the memory to: terminate transmitting the response signal to the first node, based on a determination that a termination indicator indicated by the wake-up signal comprises the termination by repetition or the termination by duration.

[0157] Clause 26: The second node of clause 24, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: await, from the first node, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE.

[0158] Clause 27: The second node of clause 26, wherein the processor is configured to execute the instruction stored in the memory to: receive, from the first node, the second wake-up signal; and terminate transmitting the response signal in response to a determination that the second wake-up signal indicates a turn-off indication.

[0159] Clause 28: The second node of clause 17, wherein the wake-up signal is received via a physical random access channel (PRACH).

[0160] Clause 29: The second node of clause 27, wherein the second wake-up signal is received via a PRACH.

[0161] Clause 30: A node for a communication, the node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receive, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an identifier (ID) of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmit, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

[0162] Clause 31: The node of clause 30, wherein the node comprises at least one user equipment (UE) that camps on the first cell.

[0163] Clause 32: The node of clause 30, wherein the one or more second cells comprise one or more network energy saving (NES) cells.

[0164] Clause 33: The node of clause 30, wherein the first cell comprises at least one anchor cell.

[0165] Clause 34: The node of clause 30, wherein the target cell is woken up to transmit the response signal based on the wake-up signal.

[0166] Clause 35: The node of clause 30, wherein the processor is configured to execute the instruction stored in the memory to: perform a radio resource management (RRM) measurement; and decode the one or more SSBs received from the one or more second cells to obtain one or more IDs corresponding to the one or more second cells.

[0167] Clause 36: The node of clause 30, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0168] Clause 37: The node of clause 30, wherein the wake-up signal for the target cell is transmitted to the first cell via a physical random access channel (PRACH).

[0169] Clause 38: The node of clause 30, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0170] Clause 39: The node of clause 30, wherein transmission of the response signal from the target cell is terminated based on the wake-up signal.

[0171] Clause 40: The node of clause 38, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: transmit, to the first cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE, wherein the second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal.

[0172] Clause 41: The node of clause 40, wherein the second wake-up signal is transmitted to the first cell via a PRACH.

[0173] Clause 42: The node of clause 30, wherein the wake-up signal configuration information for the first cell is received from the first cell via one or more SIB signals broadcasted from the first cell.

[0174] Clause 43: A second node for a second cell in a communication, the second node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receive, from the first cell, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

[0175] Clause 44: The second node of clause 43, wherein the second cell comprises at least one network energy saving (NES) cell.

[0176] Clause 45: The second node of clause 43, wherein the first cell comprises at least one anchor cell.

[0177] Clause 46: The second node of clause 43, wherein the second node comprises at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a user equipment (UE) within the second cell.

[0178] Clause 47: The second node of clause 43, wherein the first node comprises at least one UE that camps on the first cell.

[0179] Clause 48: The second node of clause 43, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0180] Clause 49: The second node of clause 43, wherein the second node is woken up to transmit the response signal based on the wake-up signal.

[0181] Clause 50: The second node of clause 43, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0182] Clause 51: The second node of clause 50, wherein the processor is configured to execute the instruction stored in the memory to: terminate transmitting the response signal to the first node, based on a determination that a termination indicator indicated by the wake-up signal comprises the termination by repetition or the termination by duration.

[0183] Clause 52: The second node of clause 50, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: await, from the first cell, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE.

[0184] Clause 53: The second node of clause 52, wherein the processor is configured to execute the instruction stored in the memory to: receive, from the first cell, the second wake-up signal; and terminate transmitting the response signal in response to a determination that the second wake-up signal indicates a turn-off indication.

[0185] Clause 54: The second node of clause 43, wherein the wake-up signal is received via a Xn interface between the first cell and the second cell.

[0186] Clause 55: The second node of clause 53, wherein the second wake-up signal is received via a Xn interface between the first cell and the second cell.

[0187] Clause 56: A cell node for a first cell in a communication, the cell node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from at least one second cell, an identifier (ID) of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmit, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receive, from the first node, a wake-up signal for the at least one second cell; and transmit, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

[0188] Clause 57: The cell node of clause 56, wherein the at least one second cell comprises at least one network energy saving (NES) cell.

[0189] Clause 58: The cell node of clause 56, wherein the first cell comprises at least one anchor cell.

[0190] Clause 59: The cell node of clause 56, wherein the cell node comprises at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a user equipment (UE) within the first cell.

[0191] Clause 60: The cell node of clause 56, wherein the first node comprises at least one UE that camps on the first cell.

[0192] Clause 61: The cell node of clause 56, wherein the at least one second cell is woken up to transmit a response signal to the first node based on the wake-up signal received from the cell node.

[0193] Clause 62: The cell node of clause 56, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0194] Clause 63: The cell node of clause 62, wherein the wake-up signal received from the first node is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: await, from the first node, a second wake-up signal for the at least one second cell, in response to a determination that the first wake-up signal received from the first node indicates the termination by UE.

[0195] Clause 64: The cell node of clause 63, wherein the processor is configured to execute the instruction stored in the memory to: receive, from the first node, the second wake-up signal; and transmit, to the at least one second cell, a wake-up signal corresponding to the second wake-up signal received from the first node.

[0196] Clause 65: The cell node of clause 56, wherein the wake-up signal from the first node is received via a physical random access channel (PRACH).

[0197] Clause 66: The cell node of clause 63, wherein the second wake-up signal from the first node is received via a PRACH.

[0198] Clause 67: The cell node of clause 56, wherein the wake-up signal configuration information further includes the ID of the at least one second cell.

[0199] Clause 68: A method for a node for a communication, the method comprising: receiving, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an identifier (ID) of the target cell and one or more termination indicators supported by the target cell; receiving, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for the target cell is met; transmitting the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0200] Clause 69: The method of clause 68, wherein the node comprises at least one user equipment (UE) that camps on the first cell.

[0201] Clause 70: The method of clause 68, wherein the one or more second cells comprise one or more network energy saving (NES) cells.

[0202] Clause 71: The method of clause 68, wherein the first cell comprises at least one anchor cell.

[0203] Clause 72: The method of clause 68, wherein the target cell is woken up to transmit the response signal based on the wake-up signal.

[0204] Clause 73: The method of clause 68, wherein the method further comprises: performing a radio resource management (RRM) measurement; and decoding the one or more SSBs received from the one or more second cells to obtain one or more IDs corresponding to the one or more second cells.

[0205] Clause 74: The method of clause 68, wherein determining whether the condition for triggering the wake-up signal for the target cell is met comprises identifying the target cell based on one or more IDs corresponding to the one or more second cells and the ID of the target cell received from the first cell.

[0206] Clause 75: The method of clause 68, wherein the wake-up signal configuration information for the target cell comprises one or more wake-up signal resources specified for the target cell, and the method further comprises: transmitting the wake-up signal based on the one or more wake-up signal resources specified for the target cell.

[0207] Clause 76: The method of clause 75, wherein the one or more wake-up signal resources specified for the target cell comprise at least one of: a type of channel to be used for transmission of the wake-up signal, a time resource for transmission of the wake-up signal, or a frequency resource for transmission of the wake-up signal.

[0208] Clause 77: The method of clause 68, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0209] Clause 78: The method of clause 68, wherein the wake-up signal is transmitted to the target cell via a physical random access channel (PRACH).

[0210] Clause 79: The method of clause 68, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0211] Clause 80: The method of clause 79, wherein transmission of the response signal from the target cell is terminated based on a determination that a termination indicator indicated by the wake-up signal is the termination by repetition or the termination by duration.

[0212] Clause 81: The method of clause 79, wherein the wake-up signal is a first wake-up signal, and the method further comprises: transmitting, to the target cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE, wherein the second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal.

[0213] Clause 82: The method of clause 81, wherein the second wake-up signal is transmitted to the target cell via a PRACH.

[0214] Clause 83: The method of clause 78, wherein the wake-up signal configuration information is received via one or more SIB signals broadcasted from the first cell.

[0215] Clause 84: A method for a second node for a second cell in a communication, the method comprising: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receiving, from the first node, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0216] Clause 85: The method of clause 84, wherein the second cell comprises at least one network energy saving (NES) cell.

[0217] Clause 86: The method of clause 84, wherein the first cell comprises at least one anchor cell.

[0218] Clause 87: The method of clause 84, wherein the second node comprises at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a user equipment (UE) within the second cell.

[0219] Clause 88: The method of clause 84, wherein the first node comprises at least one UE that camps on the first cell.

[0220] Clause 89: The method of clause 84, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0221] Clause 90: The method of clause 84, wherein the second node is woken up to transmit the response signal based on the wake-up signal.

[0222] Clause 91: The method of clause 84, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0223] Clause 92: The method of clause 91, wherein the method further comprises: terminating transmitting the response signal to the first node, based on a determination that a termination indicator indicated by the wake-up signal comprises the termination by repetition or the termination by duration.

[0224] Clause 93: The method of clause 91, wherein the wake-up signal is a first wake-up signal, and the method further comprises: awaiting, from the first node, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE.

[0225] Clause 94: The method of clause 93, wherein the method further comprises: receiving, from the first node, the second wake-up signal; and terminating transmitting the response signal in response to a determination that the second wake-up signal indicates a turn-off indication.

[0226] Clause 95: The method of clause 84, wherein the wake-up signal is received via a physical random access channel (PRACH).

[0227] Clause 96: The method of clause 94, wherein the second wake-up signal is received via a PRACH.

[0228] Clause 97: A method for a node for a communication, the method comprising: receiving, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receiving, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an identifier (ID) of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmitting, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0229] Clause 98: The method of clause 97, wherein the node comprises at least one user equipment (UE) that camps on the first cell.

[0230] Clause 99: The method of clause 97, wherein the one or more second cells comprise one or more network energy saving (NES) cells.

[0231] Clause 100: The method of clause 97, wherein the first cell comprises at least one anchor cell.

[0232] Clause 101: The method of clause 97, wherein the target cell is woken up to transmit the response signal based on the wake-up signal.

[0233] Clause 102: The method of clause 97, wherein the method further comprises: performing a radio resource management (RRM) measurement; and decoding the one or more SSBs received from the one or more second cells to obtain one or more IDs corresponding to the one or more second cells.

[0234] Clause 103: The method of clause 97, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0235] Clause 104: The method of clause 97, wherein the wake-up signal for the target cell is transmitted to the first cell via a physical random access channel (PRACH).

[0236] Clause 105: The method of clause 97, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0237] Clause 106: The method of clause 97, wherein transmission of the response signal from the target cell is terminated based on the wake-up signal.

[0238] Clause 107: The method of clause 105, wherein the wake-up signal is a first wake-up signal, and the method further comprises: transmitting, to the first cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE, wherein the second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal.

[0239] Clause 108: The method of clause 107, wherein the second wake-up signal is transmitted to the first cell via a PRACH.

[0240] Clause 109: The method of clause 97, wherein the wake-up signal configuration information for the first cell is received from the first cell via one or more SIB signals broadcasted from the first cell.

[0241] Clause 110: A method for a second node for a second cell in a communication, the method comprising: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receiving, from the first cell, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0242] Clause 111: The method of clause 110, wherein the second cell comprises at least one network energy saving (NES) cell.

[0243] Clause 112: The method of clause 110, wherein the first cell comprises at least one anchor cell.

[0244] Clause 113: The method of clause 110, wherein the second node comprises at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a user equipment (UE) within the second cell.

[0245] Clause 114: The method of clause 110, wherein the first node comprises at least one UE that camps on the first cell.

[0246] Clause 115: The method of clause 110, wherein the response signal comprises a system information block type 1 (SIB1) signal.

[0247] Clause 116: The method of clause 110, wherein the second node is woken up to transmit the response signal based on the wake-up signal.

[0248] Clause 117: The method of clause 110, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0249] Clause 118: The method of clause 117, wherein the method further comprises: terminating transmitting the response signal to the first node, based on a determination that a termination indicator indicated by the wake-up signal comprises the termination by repetition or the termination by duration.

[0250] Clause 119: The method of clause 117, wherein the wake-up signal is a first wake-up signal, and the method further comprises: awaiting, from the first cell, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE.

[0251] Clause 120: The method of clause 119, wherein the method further comprises: receiving, from the first cell, the second wake-up signal; and terminating transmitting the response signal in response to a determination that the second wake-up signal indicates a turn-off indication.

[0252] Clause 121: The method of clause 110, wherein the wake-up signal is received via a Xn interface between the first cell and the second cell.

[0253] Clause 122: The method of clause 120, wherein the second wake-up signal is received via a Xn interface between the first cell and the second cell.

[0254] Clause 123: A method for a cell node for a first cell in a communication, the method comprising: receiving, from at least one second cell, an identifier (ID) of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmitting, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receiving, from the first node, a wake-up signal for the at least one second cell; and transmitting, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

[0255] Clause 124: The method of clause 123, wherein the at least one second cell comprises at least one network energy saving (NES) cell.

[0256] Clause 125: The method of clause 123, wherein the first cell comprises at least one anchor cell.

[0257] Clause 126: The method of clause 123, wherein the cell node comprises at least one of: a base station, a road-side unit, a repeater, a transponder, a wireless router, a controller, an access point, or a user equipment (UE) within the first cell.

[0258] Clause 127: The method of clause 123, wherein the first node comprises at least one UE that camps on the first cell.

[0259] Clause 128: The method of clause 123, wherein the at least one second cell is woken up to transmit a response signal to the first node based on the wake-up signal received from the cell node.

[0260] Clause 129: The method of clause 123, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

[0261] Clause 130: The method of clause 129, wherein the wake-up signal received from the first node is a first wake-up signal, and the method further comprises: awaiting, from the first node, a second wake-up signal for the at least one second cell, in response to a determination that the first wake-up signal received from the first node indicates the termination by UE.

[0262] Clause 131: The method of clause 130, further comprising: receiving, from the first node, the second wake-up signal; and transmitting, to the at least one second cell, a wake-up signal corresponding to the second wake-up signal received from the first node.

[0263] Clause 132: The method of clause 123, wherein the wake-up signal from the first node is received via a physical random access channel (PRACH).

[0264] Clause 133: The method of clause 130, wherein the second wake-up signal from the first node is received via a PRACH.

[0265] Clause 134: The method of clause 123, wherein the wake-up signal configuration information further includes the ID of the at least one second cell.

[0266] Clause 135: A non-transitory computer-readable medium storing instructions that are executable by one or more processors of a node for a communication, to perform a method, the method comprising: receiving, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an identifier (ID) of the target cell and one or more termination indicators supported by the target cell; receiving, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for the target cell is met; transmitting the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0267] Clause 136: A non-transitory computer-readable medium storing instructions that are executable by one or more processors of a second node for a second cell in a communication, to perform a method, the method comprising: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receiving, from the first node, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0268] Clause 137: A non-transitory computer-readable medium storing instructions that are executable by one or more processors of a node for a communication, to perform a method, the method comprising: receiving, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receiving, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an identifier (ID) of a corresponding one of the one or more second cells; determining whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmitting, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receiving, from the target cell, a response signal as a response to the wake-up signal; and initiating connection with the target cell based on the response signal received from the target cell.

[0269] Clause 138: A non-transitory computer-readable medium storing instructions that are executable by one or more processors of a second node for a second cell in a communication, to perform a method, the method comprising: transmitting, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmitting, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receiving, from the first cell, a wake-up signal; and transmitting, to the first node, a response signal as a response to the wake-up signal.

[0270] Clause 139: A non-transitory computer-readable medium storing instructions that are executable by one or more processors of a cell node for a first cell in a communication, to perform a method, the method comprising: receiving, from at least one second cell, an identifier (ID) of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmitting, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receiving, from the first node, a wake-up signal for the at least one second cell; and transmitting, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

Claims

1. A node for a communication, the node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from a first cell, wake-up signal configuration information for a target cell among one or more second cells, the wake-up signal configuration information including an identifier (ID) of the target cell and one or more termination indicators supported by the target cell; receive, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an ID of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for the target cell is met; transmit the wake-up signal in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

2. The node of claim 1, wherein the processor is configured to execute the instruction stored in the memory to: perform a radio resource management (RRM) measurement; and decode the one or more SSBs received from the one or more second cells to obtain one or more IDs corresponding to the one or more second cells.

3. The node of claim 1, wherein determining whether the condition for triggering the wake-up signal for the target cell is met comprises identifying the target cell based on one or more IDs corresponding to the one or more second cells and the ID of the target cell received from the first cell.

4. The node of claim 1, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

5. The node of claim 4, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: transmit, to the target cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE, wherein the second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal.

6. A second node for a second cell in a communication, the second node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receive, from the first node, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

7. The second node of claim 6, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

8. The second node of claim 7, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: await, from the first node, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE.

9. A node for a communication, the node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from a first cell, wake-up signal configuration information for the first cell and one or more termination indicators supported by one or more second cells; receive, from the one or more second cells, one or more synchronization signal blocks (SSBs), each of the one or more SSBs including an identifier (ID) of a corresponding one of the one or more second cells; determine whether a condition for triggering a wake-up signal for a target cell among the one or more second cells is met; transmit, to the first cell, the wake-up signal for the target cell, in response to a determination that the condition for triggering the wake-up signal is met; receive, from the target cell, a response signal as a response to the wake-up signal; and initiate connection with the target cell based on the response signal received from the target cell.

10. The node of claim 9, wherein the processor is configured to execute the instruction stored in the memory to: perform a radio resource management (RRM) measurement; and decode the one or more SSBs received from the one or more second cells to obtain one or more IDs corresponding to the one or more second cells.

11. The node of claim 9, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

12. The node of claim 11, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: transmit, to the first cell, a second wake-up signal, in response to a determination that a termination indicator indicated by the first wake-up signal is the termination by UE, wherein the second wake-up signal indicates a turn-off indication instructing the target cell to stop transmitting the response signal.

13. The node of claim 9, wherein the wake-up signal configuration information for the first cell is received from the first cell via one or more SIB signals broadcasted from the first cell.

14. A second node for a second cell in a communication, the second node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: transmit, to a first cell, wake-up signal configuration information for the second cell, the wake-up signal configuration information including an identifier (ID) of the second cell and one or more termination indicators supported by the second cell; transmit, to a first node, a synchronization signal block (SSB), the SSB including the ID of the second cell; receive, from the first cell, a wake-up signal; and transmit, to the first node, a response signal as a response to the wake-up signal.

15. The second node of claim 14, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

16. The second node of claim 15, wherein the wake-up signal is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: await, from the first cell, a second wake-up signal, in response to a determination that the first wake-up signal indicates the termination by UE.

17. A cell node for a first cell in a communication, the cell node comprising: a memory storing an instruction; and a processor configured to execute the instruction stored in the memory to: receive, from at least one second cell, an identifier (ID) of the at least one second cell and one or more termination indicators supported by the at least one second cell; transmit, to a first node, wake-up signal configuration information for the first cell, the wake-up signal configuration information including the one or more termination indicators supported by the at least one second cell; receive, from the first node, a wake-up signal for the at least one second cell; and transmit, to the at least one second cell, a wake-up signal corresponding to the wake-up signal received from the first node.

18. The cell node of claim 17, wherein the one or more termination indicators comprise at least one of: a termination by repetition, a termination by duration, or a termination by UE.

19. The cell node of claim 18, wherein the wake-up signal received from the first node is a first wake-up signal, and the processor is configured to execute the instruction stored in the memory to: await, from the first node, a second wake-up signal for the at least one second cell, in response to a determination that the first wake-up signal received from the first node indicates the termination by UE.

20. The cell node of claim 19, wherein the processor is configured to execute the instruction stored in the memory to: receive, from the first node, the second wake-up signal; and transmit, to the at least one second cell, a wake-up signal corresponding to the second wake-up signal received from the first node.

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