A method for enabling notification of an action, and related wireless devices

Abstract

Disclosed is a method, performed by a first wireless device, for enabling notification of an action to be performed by a second wireless device. The first wireless device and the second wireless device are operating in a wireless communication system. The second wireless device operates in a sleep mode relying on reception of a wake-up signal (WUS) for waking up the second wireless device. The WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system. The method comprises obtaining a WUS configuration. The WUS configuration is indicative of one or more of: a signalling sequence associated with an action to be initiated by the second wireless device, and a timing information associated with a reception behavior of the second wireless device.

Description

[0001] A METHOD FOR ENABLING NOTIFICATION OF AN ACTION, AND RELATED WIRELESS DEVICES

[0002] The present disclosure pertains to the field of wireless communications. The present disclosure relates to a method for enabling notification of an action, and related wireless devices.

[0003] BACKGROUND

[0004] Low-power wake up signalling has been introduced in 3rd Generation Partnership Project (3GPP) and being studied for Release 18 as a way to enable wireless devices to enter an ultra- low-power sleep mode, such as a deep sleep state, where such wireless devices rely on a dedicated ultra-low-power receiver, such as a low-power wake-up receiver (WUR), and dedicated low complexity signalling for a wake-up process. Typically, a wake-up signal (WUS) is transmitted by a radio network node. However, it may be beneficial to have a wireless device transmitting a WUS to other wireless device, namely in situations where the transmitting wireless device requires certain actions, such as support, from receiving wireless devices.

[0005] SUMMARY

[0006] Accordingly, there is a need for devices and methods, which may mitigate, alleviate or address the shortcomings existing and may provide for communication of WUSs between one or more wireless devices.

[0007] Disclosed is a method, performed by a first wireless device, for enabling notification of an action to be performed by a second wireless device. The first wireless device and the second wireless device are operating in a wireless communication system. The second wireless device operates in a sleep mode relying on reception of a wake-up signal (WUS) for waking up the second wireless device. The WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system. The method comprises obtaining a WUS configuration. The WUS configuration is indicative of one or more of: a signalling sequence associated with an action to be initiated by the second wireless device, and a timing information associated with a reception behavior of the second wireless device. The method comprises transmitting, to the second wireless device, a WUS based on the obtained WUS configuration.

[0008] Further, a first wireless device comprising memory circuitry, processor circuitry, and a wireless interface is disclosed. The first wireless device is configured to perform any of the methods disclosed herein. It is an advantage of the present disclosure that the first wireless device can notify the second wireless device operating in a deep sleep mode that the first wireless device is in need of assistance, such as in need of a power transfer and / or data transfer. The first wireless device may notify the second wireless device by transmitting a WUS to the second wireless device.

[0009] Disclosed is a method performed by a second wireless device. A first wireless device and the second wireless device are operating in a wireless communication system, and the second wireless device operates in a sleep mode relying on reception of a wake-up signal, WUS, for waking up from the sleep mode. The WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system. The method comprises receiving, from the first wireless device, a WUS. The method comprises initiating an action based on the received WUS.

[0010] Further, a second wireless device comprising memory circuitry, processor circuitry, and a wireless interface is disclosed. The second wireless device is configured to perform any of the methods disclosed herein.

[0011] It is an advantage of the present disclosure that the second wireless device can be notified that the first wireless device requires assistance from the second wireless device. The second wireless device may assist the first wireless device, such as a wireless device in need, by initiating an action required by the first wireless device in response to a WUS transmitted by the first wireless device.

[0012] BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other features and advantages of the present disclosure will become readily apparent to those skilled in the art by the following detailed description of examples thereof with reference to the attached drawings, in which:

[0014] Fig. 1 is a diagram illustrating an example wireless communication system comprising an example radio network node, an example first wireless device, and an example second wireless device according to this disclosure,

[0015] Fig. 2 is a flow-chart illustrating an example method, performed by a first wireless device, for enabling notification of an action to be performed by a second wireless device according to this disclosure,

[0016] Fig. 3 is a flow-chart illustrating an example method, performed by a second wireless device, for operating in a sleep mode relying on reception of a WUS for waking up the second wireless device from the sleep mode according to this disclosure, Fig. 4 is a block diagram illustrating an example first wireless device according to this disclosure,

[0017] Fig. 5 is a block diagram illustrating an example second wireless device according to this disclosure, and

[0018] Figs. 6A-6B show a signalling diagram illustrating an example communication between a radio network node, a first wireless device, and a second wireless device according to this disclosure.

[0019] DETAILED DESCRIPTION

[0020] Various examples and details are described hereinafter, with reference to the figures when relevant. It should be noted that the figures may or may not be drawn to scale and that elements of similar structures or functions are represented by like reference numerals throughout the figures. It should also be noted that the figures are only intended to facilitate the description of the examples. They are not intended as an exhaustive description of the disclosure or as a limitation on the scope of the disclosure. In addition, an illustrated example needs not have all the aspects or advantages shown. An aspect or an advantage described in conjunction with a particular example is not necessarily limited to that example and can be practiced in any other examples even if not so illustrated, or if not so explicitly described.

[0021] The figures are schematic and simplified for clarity, and they merely show details which aid understanding the disclosure, while other details have been left out. Throughout, the same reference numerals are used for identical or corresponding parts.

[0022] The concept of dedicated WUR and dedicated low complexity signalling relates to a reduction of power consumption in a wireless device, when the wireless device is not in a connected mode, such as when the wireless device is in a dormant mode. For example, when the second wireless device wakes up, the second wireless device is intended to turn on its full receiver for performing an action towards the first wireless device, such as the wireless device configured to transmit the WUS.

[0023] A connected mode may refer to an operation mode in which an action can be performed, such as one or more of: a data transmission, a power transmission, a discovery signal scanning, and any other suitable action. For example, a connected mode may refer to an operation mode in which a data transmission and / or a power transfer can be communicated, for example between the first wireless device and the second wireless device. The connected mode may refer to an operating state wherein a main radio transmitter and / or a main radio receiver is activated for such communication. The main radio transmitter and the main radio receiver can herein be seen as a radio transmitter and radio receiver used for data communication with a wireless device or a radio network node. The connected mode may refer to an operating state wherein a wireless device is synchronized time-wise and / or frequency-wise, for example by a determined timing advance parameter for the communication. In certain communication systems, a connected mode may refer to a radio resource control (RRC) state. In various examples, the connected state may be a RRC connected state and / or an RRC active state. However, the connected mode may be an active period within another RRC state.

[0024] In various examples, a non-active mode may refer to a state where a connection of a wireless device with the radio network node and / or a connection of a first wireless device with a second wireless device have been released and / or suspended, such as an RRC Inactive state and / or an RRC Idle state. During the non-active mode, a wireless device may turn off its main receiver for an inactivity period and may activate it at discrete intervals according to a configured cycle, such as Discontinued Reception (DRX) cycle configured for the wireless device, to monitor for paging signals.

[0025] A sleep mode can be seen as a mode where a wireless device is in the non-active mode and relies on the low-power WUR to receive a WUS. The sleep mode is a mode where a wireless device, such as the second wireless device, only monitors for low-power signals, such as low- power WUSs.

[0026] Expressed in a generic manner, a WUS refers to a signal used to wake up a wireless device from a low-power mode, such as a non-active mode, to a fully operational mode, such as a connected mode.

[0027] Fig. 1 is a diagram illustrating an example wireless communication system 1 comprising an example network node 400 and an example wireless device 300 according to this disclosure.

[0028] As discussed in detail herein, the present disclosure relates to a wireless communication system 1 comprising a cellular system, for example, a 3GPP wireless communication system. The wireless communication system 1 comprises one or more of: a network node 400, a first wireless device 300A, and a second wireless device 300B.

[0029] A radio network node disclosed herein refers to a radio access network (RAN) node operating in the radio access network, such as one or more of: a base station, BS, an evolved Node B (eNB), a gNB in new radio (NR), an access point (AP), and a small cell (SC). In one or more examples, the RAN node is a functional unit which may be distributed in several physical units. A core network (CN), node disclosed herein refers to a network node operating in the core network, such as in the Evolved Packet Core Network (EPC), and / or a 5G Core Network (5GC). Examples of CN nodes in EPC include a Mobility Management Entity (MME).

[0030] A wireless device may refer to one or more of: a mobile device and a user equipment (UE).

[0031] The radio network node 400 may be configured to communicate with the first wireless device 300A and the second wireless device 300B may be configured to communicate with the radio network node 400 via a wireless link (or radio access link) 10, 10A respectively. The radio network node 400 may be configured to communicate with the CN node 600 via a wired or wireless link 12. The present disclosure may involve DL communications, such as communication between the first wireless device 300A and the radio network node 400 and / or communication between the second wireless device 300A and the radio network node 400.

[0032] The first wireless device 300A may be configured to communicate with the second wireless device 300B via a wireless link (or radio access link) 14. The present disclosure may involve SL communications, such as communication between the first wireless device 300A and the second wireless device 300B.

[0033] The current disclosure provides a method for enabling the first wireless device 300A to wake up the second wireless device 300B, with the second wireless device 300B operating in a sleep mode, relying on a WUS and establish a SL communication with the second wireless device 300B. The second wireless device 300B may be configured to operate a sleep mode relying on reception of a WUS from the first wireless device 300A for waking up the second wireless device 300B. The second wireless device operating in sleep mode may turn off its main receiver, such as its full receiver, and may rely on a low-power WUR to receive WUSs. The low- power WUR may be always on or operating based on a duty-cycled scheme, such as listening for potential WUSs.

[0034] The present disclosure allows enhancing wake up signalling framework to enable the first wireless device to wake up the second wireless device 300B and / or a group of wireless devices comprising the second wireless device 300B in scenarios where first wireless device is in need, such as in emergency situations. In a generic manner, the present disclosure may allow enhancing wake up signalling framework to enable wireless devices to wake up each other in an emergency scenario, such as in an out-of-coverage scenario and / or an out-of-battery scenario. The first wireless device 300A may refer to a wireless device in need of assistance, such as a wireless device requiring one or more of: an urgent and / or non-urgent data transmission, and a power transfer. The second wireless device 300B may refer to a wireless device of a WU group, such as a group of wireless devices configured to detect and / or receive a WUS.

[0035] The first wireless device 300A may transmit a WUS to the second wireless device 300B and / or the WU group for invoking an action from the second wireless device 300B towards the first wireless device 300A, such as an action to assist the first wireless device 300A in an emergency scenario.

[0036] For example, the second wireless device and / or the WU group may activate its main receiver to perform an action towards the first wireless device.

[0037] In one or more examples, transmission of a WUS is not limited to network access. The present disclosure provides a technique making use of a WUS for triggering an action to be taken by the second wireless device 300B. For example, the disclosure provides a technique making use of a WUS for emergency scenarios, out-of-battery scenarios and / or out-of-coverage scenarios. An action may comprise one or more of: starting a main receiver of the second wireless device, listening for discovery signals, starting a transmitter of the second wireless device, transmitting discovery signals, performing a power transfer, obtaining sensor data, and any other suitable actions.

[0038] The current disclosure may be useful for emergency scenarios. For example, when the first wireless device 300A is out of coverage or running out of power resources, the first wireless device 300A can rely on establishing a sidelink (SL) communication to other wireless devices in its vicinity, such as to the second wireless device 300B. The first wireless device 300A may transmit the WUS to wake up the second wireless device 300B operating in a deep sleep mode for triggering an action on the second wireless device 300B required by the first wireless device 300A.

[0039] The current disclosure may be useful for enhancing coverage of a cell. For example, the first wireless device 300A is out of coverage and needs to share data, such as non-urgent data, as a way to enhance coverage of a cell. The first wireless device 300A may establish a SL communication with the second wireless device 300B for improving coverage of a cell. The first wireless device 300A may trigger an action on the second wireless device 300B required by the first wireless device 300A, such as transmission of data to a node of the wireless communication system. The current disclosure may be useful for low intensity SL scenarios, such as when a wireless device communicates with a sensor. The first wireless device 300A may need to receive, from the sensor, sensor data. The first wireless devices 300A may be allowed to operate in a deep sleep state between occasional interactions. The first wireless device 300A may establish a SL communication with the second wireless device 300B for obtaining sensor data from the sensor via the second wireless device 300B. The first wireless device 300A may trigger the second wireless device 300B to obtain sensor data from the sensor and transmit it to the first wireless device 300A.

[0040] Fig. 2 is a flow-chart illustrating an example method 100, performed by a first wireless device according to the disclosure, for enabling notification of an action to be performed by a second wireless device. The first wireless device and the second wireless device are operating in a wireless communication system. The second wireless device operates in a sleep mode relying on reception of a WUS for waking up the second wireless device. The second wireless device have its main receiver, such as a full receiver, turned off and may rely on a low-power wake-up receiver (WUR) to receive a WUS. The low-power WUR may be always on or operate based on a duty-cycled scheme. The WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system. The WUS is encoded and / or modulated so that it allows for lower complexity reception and / or demodulation, resulting in low power consumption reception. This consequently improves the energy efficiency of the second wireless device when monitoring for WUSs. The first wireless device is the first wireless device disclosed herein, such as wireless device 300A of Fig. 1 , Fig. 4, and Figs. 6A- 6B.

[0041] In one or more example methods, the method 100 comprises transmitting S102, to a radio network node, a capability message indicative of a capability of the first wireless device to perform a WUS transmission. In one or more example methods, the capability message indicates that the first wireless device supports a WUS transmission. In one or more example methods, the capability message is indicative of a capability of the first wireless device to transmit the WUS to the second wireless device. In one or more example methods, the capability message is indicative of a capability of the first wireless device to perform a WUS transmission to a group of wireless devices including the second wireless device. In one or more example methods, the capability message comprises a request for a signalling sequence to be used for transmission of the WUS. In one or more example methods, the capability message comprises a request for a signalling sequence to be used for transmission of the WUS to the second wireless device. Stated differently, the capability message may comprise a request for a signalling sequence to be used for reaching the second wireless device.

[0042] The method 100 comprises obtaining S104 a WUS configuration. The WUS configuration is indicative of one or more of: a signalling sequence associated with an action to be initiated by the second wireless device, and a timing information associated with a reception behavior of the second wireless device. In one or more example methods, the signal sequence associated with an action to be initiated by the second wireless device is a symbol sequence and / or a pattern representative of an action to be initiated by the second wireless device. In one or more example methods, a signalling sequence may refer to a pattern and / or a sequence of symbols used to wake up the second wireless device from a non-active mode to a connected mode. In one or more example methods, the timing information can indicate whether the second wireless device operates based on always-on monitoring or discontinuous reception (DRX). In one or more example methods, the signalling sequence can be associated with one or more actions to be initiated by a group of wireless devices comprising the second wireless device.

[0043] In one or more example methods, obtaining S104 the WUS configuration comprises receiving S104A an indication indicative of the WUS configuration from a radio network node. In one or more example methods, the indication is indicative of the WUS configuration. In one or more example methods, the indication is indicative of information pointing for the WUS configuration. The radio network node may configure the first wireless device with the WUS configuration, such as with dedicated signalling sequences, such as WUS sequences. In one or more example methods, the radio network node configures the first wireless device with the WUS configuration. For example, the radio network node configures the first wireless device with dedicated signalling sequences, such as signalling sequences triggering specific actions to be initiated by the WU group and / or the second wireless device. In one or more example methods, the radio network node shares the WUS configuration with the first wireless device. The first wireless device may be seen as a wireless device capable of waking up the second wireless device and / or a group of wireless devices comprising the second wireless device, such as in an emergency scenario. In one or more example methods, the WUS configuration can be broadcasted. For example, the WUS configuration can be transmitted, to the first wireless device, by any node of the wireless communication system, such as a wireless device and / or a radio network node. For example, the WUS configuration can be received by any node of the wireless communication system, such as one or more of: first wireless device, the second wireless device, and a wireless device from the group of wireless devices comprising the second wireless device. In one or more example methods, obtaining S104 the WUS configuration comprises the first wireless device being pre-configured S104B with the WUS configuration. In one or more example methods, the first wireless device is pre-configured with the WUS configuration via Radio Resource Control (RRC) signaling. In one or more example methods, the first wireless device is pre-configured with the WUS configuration at fabrication and / or by hardware design. In other words, the WUS configuration may be hardcoded in the first wireless device. In one or more examples, the first wireless device is pre-configured with the WUS configuration from a node of the wireless device system, such as a radio network node.

[0044] In one or more example methods, the method 100 comprises transmitting S108, to the second wireless device, the pre-configured WUS configuration. In one or more example methods, the first wireless device transmits, to a WU group, such as a group of wireless devices comprising the second wireless device, the pre-configured WUS configuration. In one or more example methods, the WU group can be seen as a group of wireless devices capable of detecting and / or receiving the WUS signal. In one or more example methods, transmitting the pre-configured WUS configuration comprises broadcasting the preconfigured WUS to the WU group. In one or more example methods, transmitting the preconfigured WUS comprises transmitting a dedicated preconfigured WUS to a wireless device, such as the second wireless device. In one or more example methods, the pre-configured WUS configuration is indicative of one or more dedicated WUS sequences, such as sequences to be used for triggering an action to be initiated by the second wireless device.

[0045] In one or more example methods, the method 100 comprises transmitting S110, to the second wireless device, the capability message. In one or more example methods, the capability message is indicative of the pre-configured WUS configuration. In one or more example methods, the capability message comprises a signalling sequence to be used for transmission of a WUS. In one or more example methods, the capability message comprises an indication of a signalling sequence associated with the first wireless device. On other words, the capability message may indicate which signalling sequence the first wireless device is configured to use for transmission of the WUS. For example, the capability message may indicate which signalling sequence the first wireless device is configured to use when facing an emergency scenario. Optionally, the capability message can inform the second wireless device of a signalling sequence that the second wireless device can use for performing a WUS transmission to the first wireless device.

[0046] The method 100 comprises transmitting S112, to the second wireless device, a WUS based on the obtained WUS configuration. In one or more example methods, the first wireless device 300 is configured to transmit the WUS to a group of wireless devices comprising the second wireless device. The WUS may wake up the second wireless device and / or the WU group from a sleep state. In one or more example methods, the transmitted WUS comprises one or more signalling sequences, such as WUS sequences, which may enable the second wireless device and / or the WU group to detect the WUS. In one or more example methods, the second wireless device and / or the WU group may be configured to monitor for a dedicated WUS, such as a WUS associated with the first wireless device.

[0047] In one or more example methods, the WUS configuration comprises information indicative of one or more resources to be used for transmission of the WUS. In one or more example methods, transmitting S112 comprises transmitting S112A the WUS using the one or more resources. In one or more example methods, the WUS configuration comprises information indicative of one or more time and / or frequency resources, to be used for transmission of the WUS. In one or more example methods, the first wireless device transmits, to the second wireless device, the WUS at a certain time and frequency instance. In one or more example methods, the first wireless device does not have knowledge on a sleep pattern of the second wireless device. For example, the first wireless device may enable the second wireless device to receive the WUS regardless of its DRX cycle and / or DRX scheme and / or any other sleep pattern. The first wireless device and the second wireless device may be synced in time. The first wireless device and the second wireless device may not be synced in time. The first wireless device and the second wireless device may not require to be synced in time when the low power WUR of the second wireless device is permanently turned on. In one or more example methods, when the first wireless device and the second wireless device are not synced in time, such as the first wireless device is not synchronized to when the second wireless device is configured to listen (such as, DRX), the first wireless device may repeat the WUS transmission for at least one DRX cycle, such as using the one or more resources. In one or more example methods, the first wireless device can perform transmission of the WUS to the second wireless device. In one or more example methods, the first wireless device can perform one or more retransmissions of the WUS to the second wireless device.

[0048] In one or more example methods, the transmitted WUS comprises a signalling sequence being indicative of an action to be initiated by the second wireless device. In one or more example methods, transmitting the WUS comprises waking up the second wireless device from the sleep mode, such as from a deep sleep state. For example, transmitting the WUS comprises triggering and / or invoking an action to be taken by the second wireless device. In one or more example methods, a SL communication is established between the first wireless device and other wireless devices in vicinity of the first wireless device, upon reception of the WUS by the second wireless device. For example, a SL communication is established between the first wireless device and the WU group. For example, a SL communication is established between the first wireless device and the second wireless device upon reception of the WUS by the second wireless device. The second wireless device may initiate an action upon receiving the WUS from the first wireless device, such as upon a SL communication is established between the first wireless device and the second wireless device. The SL communication between the first wireless device and the second wireless device may be established after reception of the WUS by the second wireless device. In one or more example methods, transmission of the WUS to the second wireless device does not require establishment of a SL connection between the first wireless device and the second wireless device . In some examples, the WUS transmission and / or WUS reception is independent from an established connection (e.g. an established SL connection and / or a synchronization between the first and the second wireless device). In other words, the second wireless device can listen and receive the WUS without activating its transmitter or the main receiver, such as without establishing a SL connection with the first wireless device. This may lead to some power savings for the second wireless device and / or first wireless device.

[0049] In one or more example methods, the first wireless device transmits, to the second wireless device, the WUS not only to wake up the second wireless device from the deep sleep state but also to trigger an action to be initiated by the second wireless device, such as to influence subsequent actions of the second wireless device. In one or more example methods, the signalling sequence may identify the first wireless device, such as may trigger an action to be taken towards the first wireless device.

[0050] In one or more examples, the signal sequence is a symbol sequence allows for lower complexity reception and / or demodulation, resulting in low power consumption reception at the second wireless device.

[0051] In one or more example methods, the action comprises one or more of: starting a main receiver of the second wireless device, listening and / or scanning for discovery signals, starting a transmitter of the second wireless device, transmitting discovery signals, performing a power transfer, obtaining sensor data, and transmitting messages to another wireless device and / or a radio network node. In one or more example methods, the signalling sequence comprised in the WUS can indicate to the second wireless device and / or the WU group to wake up and scan for SL discovery signalling. In one or more example methods, the signalling sequence can be indicative of a low power battery level of the first wireless device. In one or more example methods, the signalling sequence is indicative of the first wireless device being in one or more of: an emergency scenario, an out-of-coverage scenario, and an out-of-battery scenario. In one or more example methods, an emergency scenario may refer to an out-of-coverage scenario and / or an out-of-battery scenario. The first wireless device may transmit, to the second wireless device, the WUS for waking up the second wireless device from the sleep mode. The first wireless device may wake the second wireless device when the first wireless device is out of coverage and / or running out of power resources. A SL communication may be established between the first wireless device and the second wireless device allowing the first wireless device to receive from, the second wireless device, one or more of: a data transfer, such as an urgent data transfer and / or non-urgent data transfer, and a power transfer. In one or more example methods, the first wireless device can receive, from the second wireless device, a wireless power transfer and / or wired power transfer.

[0052] For example, the second wireless device receives a WUS comprising a signalling sequence indicative of a low power battery level of the first wireless device. The second wireless device may wake up and perform a power transfer to the first wireless device, such as a wireless device with insufficient energy resources.

[0053] In one or more example methods, the signalling sequence is indicative of the first wireless device being in a low intensity SL scenario. A low intensity SL scenario may refer to a wireless device in connection with a sensor. In one or more example methods, the first wireless device transmits, to the second wireless device, a WUS indicative of a dedicated signalling sequence, such as a specific signalling sequence, triggering the second wireless device to obtain sensor data from the sensor and transmit it to the first wireless device.

[0054] Fig. 3 is a flow-chart illustrating an example method 200 performed by a second wireless device according to the disclosure. A first wireless device and the second wireless device are operating in a wireless communication system, and the second wireless device operates in a sleep mode relying on reception of a WUS for waking up from the sleep mode. The WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system. The second wireless device is the second wireless device disclosed herein, such as wireless device 300B of Fig. 1 , Fig. 5, and Figs. 6A-6B.

[0055] In one or more example methods, the method 200 comprises obtaining S204 a WUS configuration. In one or more example methods, the WUS configuration is indicative of one or more of: a signalling sequence associated with an action to be initiated by the second wireless device, and a timing information associated with a reception behavior of the second wireless device. In one or more example methods, the signal sequence associated with an action to be initiated by the second wireless device is a symbol sequence and / or a pattern representative of an action to be initiated by the second wireless device. In one or more example methods, a signalling sequence may refer to a pattern and / or a sequence of symbols used to wake up the second wireless device from a non-active mode to a connected mode. In one or more example methods, the timing information can indicate whether the second wireless device operates based on always-on monitoring or discontinuous reception (DRX). In one or more example methods, the signalling sequence can be associated with one or more actions to be initiated by a WU group, such as a group of wireless devices comprising the second wireless device configured to detect a WUS.

[0056] In one or more example methods, the WUS configuration comprises one or more resources to be used for reception of the WUS signal. In one or more example methods, obtaining S204 the WUS configuration comprises receiving S204A the WUS configuration from a radio network node. In one or more example methods, the WUS configuration comprises one or more time and / or frequency resources, to be used for reception of the WUS. In one or more example methods, the second wireless device receives, from the first wireless device, the WUS at a certain time and frequency instance. In one or more example methods, the first wireless device does not have knowledge on a sleep pattern of the second wireless device. The first wireless device and the second wireless device may be synced in time. The first wireless device and the second wireless device may not be synced in time. The first wireless device and the second wireless device may not require to be synced in time when the low power WUR of the second wireless device is permanently turned on. In one or more example methods, when the first wireless device and the second wireless device are not synced in time, such as the first wireless device is not synchronized to when the second wireless device is configured to listen (such as, DRX), the first wireless device may repeat the WUS transmission for at least one a DRX cycle, such as using the one or more resources. In one or more example methods, the first wireless device can perform one or more retransmissions of the WUS to the second wireless device.

[0057] In one or more example methods, obtaining S204 the WUS configuration comprises the second wireless device being pre-configured S204B with the WUS-configuration. In one or more example methods, the second wireless device is pre-configured with the WUS configuration via Radio Resource Control (RRC) signaling. In one or more example methods, the second wireless device is pre-configured with the WUS at fabrication and / or by hardware design . In other words, the WUS configuration may be hardcoded in the second wireless device. In one or more examples, the second wireless device is pre-configured with the WUS configuration from a node of the wireless device system, such as a radio network node. In one or more example methods, the method 200 comprises receiving S208, from the first wireless device, the pre-configured WUS configuration. In one or more example methods, the second wireless device receives the pre-configured WUS configuration transmitted in S108 of Fig. 2.

[0058] In one or more example methods, the method 200 comprises receiving S210, from the first wireless device, a capability message indicative of a capability of the first wireless device to perform a WUS transmission. In one or more example methods, the capability message comprises the pre-configured WUS configuration. In one or more example methods, the capability message comprises a request for a signalling sequence to be used for transmission of the WUS. The second wireless device may have its main receiver turned on to receive the capability message from the first wireless device. In one or more example methods, the second wireless device receives the capability message transmitted in S110 of Fig. 2.

[0059] The method 200 comprises receiving S212, from the first wireless device, a WUS. In one or more example methods, the second wireless device receives the WUS transmitted in S212 of Fig. 2. In one or more example methods, the second wireless device is configured to operate a sleep mode relying on reception of the WUS for waking up the second wireless device. The second wireless device may have its transceiver (such as transmitter and / or receiver, e.g., main receiver) turned off and may rely on a low-power wake-up receiver (WUR) to receive the WUS.

[0060] The method 200 comprises initiating S214 an action based on the received WUS. In one or more example methods, the second wireless device initiates an action in response to the received WUS. In one or more example methods, the second wireless device is configured to listen for one or more WUS, such as a WUS transmitted by the first wireless device. The second wireless device may listen and / or scan for a WUS by monitoring a channel using the WUR. The WUR may be always on or may operate based on DRX scheme. The second wireless device may initiate an action upon detecting the WUS. For example, the second wireless device is intended to turn on its main receiver upon detecting the WUS in order to perform an action towards the first wireless device.

[0061] In one or more example methods, the WUS is indicative of an action to be taken by the second wireless device. In one or more example methods, the action comprises one or more of: starting a main receiver of the second wireless device, listening and / or scanning for discovery signals, starting a transmitter of the second wireless device, transmitting discovery signals, performing a power transfer, obtaining sensor data (such as, to collect information), and transmitting messages to another wireless devices and / or a radio network node. In one or more example methods, the action includes starting a main transmitter of the second wireless device. In one or more example methods, the second wireless device is triggered by the received WUS to listen and / or scan for discovery signals, such as signals used to detect nearby wireless devices. For example, the discovery signal may be used to detect a group of wireless devices available to receive the WUS from the first wireless device. The group of wireless devices may comprise the second wireless device. In one or more example methods, the second wireless device is configured to transmit discovery signals to other nodes of the wireless communication system, such as to other wireless devices. In one or more examples, the second wireless device is configured to transmit messages to other nodes of the wireless communication system, such as other wireless devices and / or a radio network node. In one or more example methods, the second wireless device is configured to inform such nodes of an action required by the first wireless device in response to receiving the WUS from the first wireless device. Stated differently, the second wireless device is configured to inform such nodes of an action required by the first wireless device in case such nodes can perform the required action. In one or more example methods, the second wireless device is configured to perform a power transfer to the first wireless device upon receiving the WUS from the first wireless device. In one or more examples, the first wireless device may be running out of power resources. In one or more example methods, the WUS can be indicative of a low power battery level of the first wireless device. In one or more example methods, the first wireless device has its main transmitter turned on to perform the power transfer to the first wireless device.

[0062] In one or more example methods, the second wireless device may use legacy procedures to connect to the radio network node, such as when there is no paging message associated with the WUS. For example, the wireless device is intended to initiate a radio link towards the radio network node. The radio network node may allocate resources for SL communication and / or configure the second wireless device to listen for SL discovery signals. The radio network node may identify that another node of the wireless communication system, such as the first wireless device, woke up the second wireless device, thereby implying that a SL communication is required, such as is to be activated, such as according to legacy procedures. In one or more example methods, the radio network node has knowledge of the position of the second wireless device, such as the wireless devices waking up. The radio network node may enable a group of wireless devices, such as a WU group, within the area where the second wireless device is located to perform an action, such as the action to be taken by the second wireless device. For example, the radio network node may enable the WU group to listen for SL discovery signals, such as according to legacy procedures. In one or more example methods, the second wireless device does not detect a paging message associated with the received WUS. The second wireless device can revert to listen for SL discover signal before returning to a deep sleep mode.

[0063] In one or more example methods, the second wireless device is part of the WU group. The first wireless device may be configured to transmit, to the WU group, a WUS comprising the same signalling sequence. In other words, a same WUS sequence may be used to wake up the wireless devices of the WU group. In one or more example methods, the WU group, such as a group of wireless devices comprising the second wireless device, are configured to wake up and listen for a paging message indicating which wireless device, such as an identifier associated with a WU wireless device, within the WU group, is intended to wake up and take an action towards the first wireless device.

[0064] In one or more example methods, the received WUS comprises a signalling sequence being indicative of the action to be initiated by the second wireless device. In one or more example methods, receiving the WUS comprises waking up from the sleep mode, such as from a deep sleep state. For example, receiving the WUS comprises triggering and / or invoking an action to be taken by the second wireless device. In one or more example methods, a SL communication is established between the first wireless device and the second wireless device upon reception of the WUS by the second wireless device. The second wireless device may initiate an action upon receiving the WUS from the first wireless device, such as upon a SL communication is established between the first wireless device and the second wireless device. The SL communication between the first wireless device and the second wireless device may be established after reception of the WUS by the second wireless device. In one or more example methods, transmission of the WUS to the second wireless device does not require establishment of a SL link between the second wireless device and the first wireless device. In some examples, the WUS transmission and / or WUS reception is independent from an established connection (e.g. an established SL connection and / or a synchronization between the first and the second wireless device).

[0065] In one or more example methods, the signalling sequence is indicative of the first wireless device being in one or more of: an emergency scenario, an out-of-coverage scenario, and an out-of-battery scenario. In one or more example methods, an emergency scenario may refer to an out-of-coverage scenario and / or an out-of-battery scenario. The first wireless device may transmit, to the second wireless device, the WUS for waking up the second wireless device from the sleep mode. The first wireless device may wake the second wireless device when the first wireless device is out of coverage and / or running out of power resources. A SL communication may be established between the first wireless device and the second wireless device allowing the first wireless device to receive from, the second wireless device, one or more of: a data transfer, such as an urgent data transfer and / or non-urgent data transfer, and a power transfer. In one or more example methods, the first wireless device can receive, from the second wireless device, a wireless power transfer and / or wired power transfer. For example, the second wireless device receives a WUS comprising a signalling sequence indicative of a low power battery level of the first wireless device. The second wireless device may wake up and perform a power transfer to the first wireless device, such as a wireless device with insufficient energy resources.

[0066] Fig. 4 shows a block diagram of an example first wireless device 300A according to the disclosure. The first wireless device 300A comprises memory circuitry 301 A, processor circuitry 302A, and a wireless interface 303A. The first wireless device 300A may be configured to perform any of the methods disclosed in Fig. 2. In other words, the first wireless device 300A may be configured for enabling notification of an action to be performed by a second wireless device.

[0067] The first wireless device 300A is configured to communicate with a second wireless device, such as the second wireless device disclosed herein, using a wireless communication system.

[0068] The first wireless device 300A is configured to obtain (such as, via the wireless interface 303A) a WUS configuration. The WUS configuration is indicative of one or more of: a signalling sequence associated with an action to be initiated by the second wireless device, and a timing information associated with a reception behavior of the second wireless device.

[0069] The first wireless device 300A is configured to transmit (such as, via the wireless interface 303A), to the second wireless device, a WUS based on the obtained WUS configuration.

[0070] The wireless interface 303A is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Long Term Evolution, LTE, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, and 3GPP system operated in licensed bands or unlicensed bands.

[0071] The first wireless device 300A is optionally configured to perform any of the operations disclosed in Fig. 2 (such as any one or more of: S102, S104, S104A, S104B, S108, S110, S112, S112A). The operations of the first wireless device 300A may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 301 A) and are executed by processor circuitry 302A.

[0072] Furthermore, the operations of the first wireless device 300A may be considered a method that the first wireless device 300A is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and / or software.

[0073] Memory circuitry 301A may be one or more of: a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), and any other suitable device. In a typical arrangement, memory circuitry 301 A may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 302A. Memory circuitry 301 A may exchange data with processor circuitry 302A over a data bus. Control lines and an address bus between memory circuitry 301 and processor circuitry 302A also may be present (not shown in Fig. 4). Memory circuitry 301A is considered a non-transitory computer readable medium.

[0074] Memory circuitry 301 A may be configured to store a WUS configuration in a part of the memory.

[0075] Fig. 5 shows a block diagram of an example second wireless device 300B according to the disclosure. The second wireless device 300B comprises memory circuitry 301 B, processor circuitry 302B, and a wireless interface 303B. The second wireless device 300B may be configured to perform any of the methods disclosed in Fig. 3. In other words, the second wireless device 300B may be configured for operating in a sleep mode relying on reception of a WUS for waking up from the sleep mode.

[0076] The second wireless device 300B is configured to communicate with a first wireless device, such as the first wireless device disclosed herein, using a wireless communication system.

[0077] The second wireless device 300B is configured to receive (such as, via the wireless interface 303B), from the first wireless device, a WUS.

[0078] The second wireless device 300B is configured to initiate (such as, via the processor circuitry 302B) an action based on the received WUS. The wireless interface 303B is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Long Term Evolution, LTE, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, and 3GPP system operated in licensed bands or unlicensed bands.

[0079] The second wireless device 300B is optionally configured to perform any of the operations disclosed in Fig. 3 (such as any one or more of: S204, S204A, S204B, S208, S210, S212, S214). The operations of the second wireless device 300B may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 301 B) and are executed by processor circuitry 302B.

[0080] Furthermore, the operations of the second wireless device 300B may be considered a method that the second wireless device 300B is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and / or software.

[0081] Memory circuitry 301 B may be one or more of: a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), and any other suitable device. In a typical arrangement, memory circuitry 301 B may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 302B. Memory circuitry 301 B may exchange data with processor circuitry 302B over a data bus. Control lines and an address bus between memory circuitry 301 and processor circuitry 302B also may be present (not shown in Fig. 5). Memory circuitry 301 B is considered a non-transitory computer readable medium.

[0082] Memory circuitry 301 B may be configured to store a WUS, a WUS configuration, a preconfigured WUS configuration, a capability message in a part of the memory.

[0083] Figs. 6A-6B show signalling diagrams illustrating example communication 500, 520 between a radio network node 400, a first wireless device 300A, and a second wireless device 300B according to this disclosure.

[0084] Fig. 6A illustrates a case in which the first wireless device 300A obtains an indication indicative of a WUS configuration from a radio network node. The first wireless device 300A and the second wireless device 300B are operating and / or communicating in a wireless communication system, such as wireless communication system of Fig. 1 . The second wireless device 300B operates in a sleep mode relying on reception of a WUS for waking up the second wireless device 300A. The WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system. The WUS is encoded and / or modulated so that it allows for lower complexity reception and / or demodulation, resulting in low power consumption reception. This consequently improves the energy efficiency of the second wireless device 300B when monitoring for WUSs.

[0085] In other words, data to be communicated in the wireless communication system may be seen as data to be communicated when the second wireless device 300B receives the WUS, such as when the second wireless device 300B is triggered to perform an action towards the first wireless device 300A. For example, data to be communicated in the wireless communication system can be seen as data to be transmitted by the second wireless device 300B to another wireless device and / or a radio network node, such as in response to reception of the WUS from the first wireless device 300A. For example, data to be communicated in the wireless communication system can be seen as data to be decoded at a receiving device, such as at a wireless device and / or a radio network node of the wireless communication system. For example, data to be communicated in the wireless communication system can be seen as one or more of: control data and user data.

[0086] In one or more examples, the first wireless device 300A transmits, to a radio network node 400, a capability message 502 indicative of a capability of the first wireless device to perform a WUS transmission. In one or more example methods, the capability message indicates that the first wireless device 300A supports a WUS transmission. In one or more examples, the capability message 502 is indicative of a capability of the first wireless device 300A to transmit the WUS to the second wireless device 300B. In one or more examples, the capability message 502 is indicative of a capability of the first wireless device 300A to perform a WUS transmission to a WU group, such as a group of wireless devices configured to detect a WUS, such as a group of wireless devices including the second wireless device 300B. In one or more examples, the capability message 502 comprises a request for a signalling sequence to be used for transmission of the WUS. For example, the capability message 502 may comprise a request for a signalling sequence to be used for reaching the second wireless device 300B. For example, the capability message 502 may comprise a request for a signalling sequence to be used for reaching a wireless device from the WU group. The first wireless device 300A obtains a WUS configuration 506. The WUS configuration 506 is indicative of one or more of: a signalling sequence associated with an action to be initiated by the second wireless device 300B, and a timing information associated with a reception behavior of the second wireless device 300B. In one or more examples, the first wireless device 300A receives, from the radio network node 400, an indication indicative of the WUS configuration 506. The signal sequence may be a symbol sequence and / or a pattern representative of an action to be initiated by the second wireless device. In one or more examples, the timing information can indicate whether the second wireless device 300B operates based on always- on monitoring or discontinuous reception (DRX).

[0087] In one or more examples, the first wireless device transmits, to the second wireless device, the capability message 502. The capability message 502 may comprise an indication of a signalling sequence associated with the first wireless device 300A. On other words, the capability message 502 may indicate which signalling sequence the first wireless device 300A is configured to use for transmission of the WUS. For example, the second wireless device 300B may be able to identify a WUS, such as a signalling sequence associated with a WUS, transmitted from the first wireless device 300A.

[0088] The first wireless device 300A transmits, to the second wireless device 300B, a WUS 508 based on the obtained WUS configuration 506. In one or more examples, the first wireless device 300A transmits, to the WU group, the WUS 508 based on the obtained WUS configuration 506. In one or more examples, the first wireless device 300A wakes up the second wireless device 300B using the WUS 508 from a sleep mode.

[0089] The WUS 508 may wake up the second wireless device 300B and / or the WU group from a sleep mode. In one or more example methods, the transmitted WUS comprises one or more signalling sequences enabling the second wireless device and / or the WU group to detect the WUS as WUS coming from the first wireless device 300A.

[0090] The WUS configuration 506 may comprise information indicative of one or more resources to be used for transmission of the WUS 508. For example, the first wireless device 500A transmits, to the second wireless device 300B and / or the WU group, the WUS 508 using the one or more resources. In one or more example methods, the WUS configuration 506 comprises information indicative of one or more time and / or frequency resources, to be used for transmission of the WUS 508. The first wireless device 300A may transmit the WUS 508 based on an always-on behavior. In one or more examples, the first wireless device 300A listens based on a DRX behavior 508A. The first wireless device 300A may transmit the WUS based on the DRX behavior 508A. In one or more example methods, the first wireless device 300A does not have knowledge on a sleep pattern of the second wireless device, such as on the DRX behavior of the second wireless device 300B. In one or more example methods, when the first wireless device 300A and the second wireless device 300B are not synced in time, such as the first wireless device 300A is not synchronized to when the second wireless device is configured to listen, the first wireless device 300A may repeat transmission of the WUS 508 for at least one DRX cycle.

[0091] In one or more examples, the transmitted WUS 508 comprises a signalling sequence being indicative of an action to be initiated by the second wireless device 300B. For example, the WUS 508 triggers and / or invokes an action to be taken by the second wireless device 300B and / or the WU group. For example, the second wireless device 300B initiates an action upon receiving the WUS from the first wireless device 300A, such as upon a SL communication is established between the first wireless device 300A and the second wireless device 300B.

[0092] The second wireless device 300B initiates an action 510A, 51 OB based on the received WUS. For example, the second wireless device is intended to turn on its main receiver upon detecting the WUS in order to perform an action required by the first wireless device. For example, the second wireless device 300B initiates action 510A required by the first wireless device via the radio network node 400. For example, the second wireless device 300B initiates action 510B required by the first wireless device. For example, action 510A, 510B comprises one or more of: starting a main receiver of the second wireless device, listening and / or scanning for discovery signals, starting a transmitter of the second wireless device, transmitting discovery signals, performing a power transfer, obtaining sensor data, and transmitting messages to another wireless device and / or a radio network node.

[0093] In one or more examples, the signalling sequence of the WUS 508 is indicative of the first wireless device 300A being in one or more of: an emergency scenario, an out-of-coverage scenario, and an out-of-battery scenario. In one or more example methods, an emergency scenario may be seen as an out-of-coverage scenario and / or an out-of-battery scenario. For example, the first wireless device 300A may wake the second wireless device 300B when the first wireless device 300A is out of coverage and / or running out of power resources. The second wireless device 300B may transmit, to the first wireless device 300A, one or more of: a data transfer, such as an urgent data transfer and / or non-urgent data transfer, and a power transfer, such as a wired and / or wireless power transfer. Fig. 6B illustrates a case in which the first wireless device 300A is pre-configured with a WUS configuration, such as from a node of the wireless communication system, for example from the radio network node and / or a wireless device. For example, Fig. 6B differs from Fig. 6A in that the first wireless device 300A and the second wireless device 300B are pre-configured with a WUS configuration instead of receiving a WUS configuration from the radio network node 400.

[0094] In one or more examples, the first wireless device 300A and / or the second wireless device 300B and / or the WU group are pre-configured with the WUS configuration 504A, 504B, such as via Radio Resource Control (RRC) signaling. For example, the WUS configuration 504A, 504B may be seen as the WUS configuration 506 of Fig. 6A. In one or more example methods, the first wireless device 300A and / or the second wireless device 300B and / or the WU group are pre-configured with the WUS configuration 504A, 504B at fabrication and / or by hardware design . In other words, the WUS configuration 504 may be hardcoded in the first wireless device 300A and / or the second wireless device 300B and / or the WU group. In one or more examples, the first wireless device 300A and / or the second wireless device 300B are pre-configured with the WUS configuration 504A, 504B from a node of the wireless device system, such as a radio network node and / or a wireless device of the wireless communication system.

[0095] In one or more examples, the first wireless device 300A transmits, to the second wireless device 300B, the capability message 502. For example, the capability message 502 comprises the WUS configuration 504A. Optionally, the first wireless device 300A transmits, to the second wireless device 300B and / or a WU group, the pre-configured WUS configuration 504A. For example, the pre-configured WUS configuration 504A, 504B may comprise signalling sequences associated with the one or more wireless devices comprised in the wireless communication system. For example, the pre-configured WUS configuration 504A, 504B may comprise signalling sequences associated with the WU group, such as comprising the second wireless device 300B, and the first wireless device 300A. In one or more example methods, the pre-configured WUS configuration 504A is indicative of one or more dedicated signalling sequences, such as signalling sequences to be used for triggering an action to be initiated by the WU group and / or the second wireless device, with the action being triggered by the first wireless device 300A. In other words, the wireless devices of the WU group and / or the second wireless device 300B may use such dedicated signalling sequences, such as signalling sequences associated with a specific wireless device, to identify which wireless device requires an action, such as action 510A, 510B. For example, the second wireless device 300B detects by the WUS signal 508 that the first wireless device 300A is a wireless device in need, such as a wireless device requiring an action from the second wireless device 300B. Examples of methods and products (first wireless device and second wireless device) according to the disclosure are set out in the following items:

[0096] Item 1 . A method, performed by a first wireless device (such as being in need of assistance, such as requiring assistance) , for enabling notification of an action to be performed by a second wireless device, wherein the first wireless device and the second wireless device are operating in a wireless communication system, wherein the second wireless device operates in a sleep mode relying on reception of a wake-up signal, WUS, for waking up the second wireless device, wherein the WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system, the method comprising: obtaining (S104) a WUS configuration, the WUS configuration being indicative of one or more of a signalling sequence associated with an action to be initiated by the second wireless device and a timing information associated with a reception behavior of the second wireless device, and

[0097] - transmitting (S112), to the second wireless device, based on the obtained WUS configuration, a WUS, e.g. requesting the second wireless device to assist the first wireless device (300A).

[0098] Item 2.The method according to item 1 , wherein the transmitted WUS comprises a signalling sequence being indicative of an action to be initiated by the second wireless device.

[0099] Item 3. The method according to item 2, wherein the action comprises one or more of: starting a main receiver of the second wireless device, listening for discovery signals, transmitting discovery signals, performing a power transfer, obtaining sensor data, and transmitting messages to another wireless device and / or a radio network node.

[0100] Item 4. The method according to any of items 2-3, wherein the signalling sequence is indicative of the first wireless device being in one or more of: an emergency scenario, an out-of-coverage scenario, and an out-of-battery scenario.

[0101] Item 5. The method according to any of the previous items, wherein the WUS configuration comprises information indicative of one or more resources to be used for transmission of the WUS, and wherein transmitting (S112) comprises transmitting (S112A) the WUS using the one or more resources. Item 6. The method according to any of the previous items, wherein obtaining (S104) the WUS configuration comprises receiving (S104A) an indication indicative of the WUS configuration from a radio network node.

[0102] Item 7. The method according to any of the previous items, wherein obtaining (S104) the WUS configuration comprises the first wireless device being pre-configured (S104B) with the WUS configuration.

[0103] Item 8. The method according to item 7, wherein the method comprises transmitting (S108), to the second wireless device, the pre-configured WUS configuration.

[0104] Item 9. The method according to any of the previous items, wherein the method comprises transmitting (S102, S110), to a radio network node and / or the second wireless device, a capability message indicative of a capability of the first wireless device to perform a WUS transmission.

[0105] Item 10. The method according to item 9, wherein the capability message is indicative of the pre-configured WUS configuration.

[0106] Item 11. The method according to any of items 9 to 10, wherein the capability message comprises a request for a signalling sequence to be used for transmission of the WUS.

[0107] Item 12. A method, performed by a second wireless device, wherein a first wireless device and the second wireless device are operating in a wireless communication system, and the second wireless device operates in a sleep mode relying on reception of a wake-up signal, WUS, for waking up from the sleep mode, wherein the WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system, the method comprising: receiving (S212), from the first wireless device, a WUS, and initiating (S214) an action based on the received WUS.

[0108] Item 13. The method according to item 12, wherein the WUS is indicative of an action to be taken by the second wireless device.

[0109] Item 14. The method according to item 13, wherein the action comprises one or more of: starting a main receiver of the second wireless device, listening for discovery signals, transmitting discovery signals, performing a power transfer, obtaining sensor data, and transmitting messages to another wireless devices and / or a radio network node.

[0110] Item 15. The method according to any of items 12 to14, wherein the received WUS comprises a signalling sequence being indicative of the action to be initiated by the second wireless device.

[0111] Item 16. The method according to item 15, wherein the signalling sequence is indicative of the first wireless device being in one or more of: an emergency scenario, an out-of-coverage scenario, and an out-of-battery scenario.

[0112] Item 17. The method according to any of items 12 to 16, wherein the method comprises obtaining (S204) a WUS configuration, the WUS configuration being indicative of one or more of a signalling sequence associated with an action to be initiated by the second wireless device and a timing information associated with a reception behavior of the second wireless device.

[0113] Item 18. The method according to item 17, wherein the WUS configuration comprises one or more resources to be used for reception of the WUS signal.

[0114] Item 19. The method according to any of items 12 to 18, wherein obtaining (S204) the WUS configuration comprises receiving (S204A) the WUS configuration from a radio network node.

[0115] Item 20. The method according to any of items 12 to 19, wherein obtaining (S204) the WUS configuration comprises the second wireless device being pre-configured (S204B) with the WUS-configuration.

[0116] Item 21. The method according to item 20, wherein the method comprises receiving (S208), from the first wireless device, the pre-configured WUS configuration.

[0117] Item 22. The method according to any of items 12 to 21 , wherein the method comprises receiving (S210), from the first wireless device, a capability message indicative of a capability of the first wireless device to perform a WUS transmission.

[0118] Item 23. The method according to item 22, wherein the capability message comprises the preconfigured WUS configuration.

[0119] Item 24. The method according to any of items 22 to 23, wherein the capability message comprises a request for a signalling sequence to be used for transmission of the WUS. Item 25. A first wireless device comprising memory circuitry, processor circuitry, and a wireless interface, wherein the first wireless device is configured to perform any of the methods according to any of items 1-11.

[0120] Item 26. A second wireless device comprising memory circuitry, processor circuitry, and a wireless interface, wherein the second wireless device is configured to perform any of the methods according to any of items 12-24.

[0121] The use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not imply any particular order, but are included to identify individual elements. Moreover, the use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not denote any order or importance, but rather the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used to distinguish one element from another. Note that the words “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used here and elsewhere for labelling purposes only and are not intended to denote any specific spatial or temporal ordering. Furthermore, the labelling of a first element does not imply the presence of a second element and vice versa.

[0122] It may be appreciated that Figures comprise some circuitries or operations which are illustrated with a solid line and some circuitries, components, features, or operations which are illustrated with a dashed line. Circuitries or operations which are comprised in a solid line are circuitries, components, features, or operations which are comprised in the broadest example. Circuitries, components, features, or operations which are comprised in a dashed line are examples which may be comprised in, or a part of, or are further circuitries, components, features, or operations which may be taken in addition to circuitries, components, features, or operations of the solid line examples. It should be appreciated that these operations need not be performed in order presented. Furthermore, it should be appreciated that not all of the operations need to be performed. The example operations may be performed in any order and in any combination. It should be appreciated that these operations need not be performed in order presented. Circuitries, components, features, or operations which are comprised in a dashed line may be considered optional.

[0123] Other operations that are not described herein can be incorporated in the example operations. For example, one or more additional operations can be performed before, after, simultaneously, or between any of the described operations. Certain features discussed above as separate implementations can also be implemented in combination as a single implementation. Conversely, features described as a single implementation can also be implemented in multiple implementations separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations, one or more features from a claimed combination can, in some cases, be excised from the combination, and the combination may be claimed as any sub-combination or variation of any sub-combination.

[0124] It is to be noted that the word "comprising" does not necessarily exclude the presence of other elements or steps than those listed. It is to be noted that the words "a" or "an" preceding an element do not exclude the presence of a plurality of such elements.

[0125] It should further be noted that any reference signs do not limit the scope of the claims, that the examples may be implemented at least in part by means of both hardware and software, and that several "means", "units" or "devices" may be represented by the same item of hardware. Language of degree used herein, such as the terms “approximately,” “about,” “generally,” and “substantially” as used herein represent a value, amount, or characteristic close to the stated value, amount, or characteristic that still performs a desired function or achieves a desired result. For example, the terms “approximately”, “about”, “generally,” and “substantially” may refer to an amount that is within less than or equal to 10% of, within less than or equal to 5% of, within less than or equal to 1% of, within less than or equal to 0.1 % of, and within less than or equal to 0.01% of the stated amount. If the stated amount is 0 (e.g., none, having no), the above recited ranges can be specific ranges, and not within a particular % of the value.

[0126] The various example methods, devices, nodes, and systems described herein are described in the general context of method steps or processes, which may be implemented in one aspect by a computer program product, embodied in a computer-readable medium, including computerexecutable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc. Generally, program circuitries may include routines, programs, objects, components, data structures, etc. that perform specified tasks or implement specific abstract data types. Computer-executable instructions, associated data structures, and program circuitries represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

[0127] Although features have been shown and described, it will be understood that they are not intended to limit the claimed disclosure, and it will be made obvious to those skilled in the art that various changes and modifications may be made without departing from the scope of the claimed disclosure. The specification and drawings are, accordingly, to be regarded in an illustrative rather than restrictive sense. The claimed disclosure is intended to cover all alternatives, modifications, and equivalents.

Claims

CLAIMS1 . A method, performed by a first wireless device being in need of assistance, for enabling notification of an action to be performed by a second wireless device, wherein the first wireless device and the second wireless device are operating in a wireless communication system, wherein the second wireless device operates in a sleep mode relying on reception of a wake-up signal, WUS, for waking up the second wireless device, wherein the WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system, the method comprising: obtaining (S104) a WUS configuration, the WUS configuration being indicative of one or more of a signalling sequence associated with an action to be initiated by the second wireless device and timing information associated with a reception behavior of the second wireless device, and- transmitting (S112), to the second wireless device, based on the obtained WUS configuration, a WUS requesting the second wireless device to assist the first wireless device (300A).

2. The method according to claim 1 , wherein the transmitted WUS comprises a signalling sequence being indicative of an action to be initiated by the second wireless device.

3. The method according to claim 2, wherein the action comprises one or more of: starting a main receiver of the second wireless device, listening for discovery signals, transmitting discovery signals, performing a power transfer, obtaining sensor data, and transmitting messages to another wireless device and / or a radio network node.

4. The method according to any of claims 2-3, wherein the signalling sequence is indicative of the first wireless device being in one or more of: an emergency scenario, an out-ofcoverage scenario, and an out-of-battery scenario.

5. The method according to any of the previous claims, wherein the WUS configuration comprises information indicative of one or more resources to be used for transmission of the WUS, and wherein transmitting (S112) comprises transmitting (S112A) the WUS using the one or more resources.

6. The method according to any of the previous claims, wherein obtaining (S104) the WUS configuration comprises receiving (S104A) an indication indicative of the WUS configuration from a radio network node.

7. The method according to any of the previous claims, wherein obtaining (S104) the WUS configuration comprises the first wireless device being pre-configured (S104B) with the WUS configuration.

8. The method according to claim 7, wherein the method comprises transmitting (S108), to the second wireless device, the pre-configured WUS configuration.

9. The method according to any of the previous claims, wherein the method comprises transmitting (S102, S110), to a radio network node and / or the second wireless device, a capability message indicative of a capability of the first wireless device to perform a WUS transmission.

10. The method according to claim 9, wherein the capability message is indicative of the pre-configured WUS configuration.

11. The method according to any of claims 9 to 10, wherein the capability message comprises a request for a signalling sequence to be used for transmission of the WUS.

12. A method, performed by a second wireless device, wherein a first wireless device and the second wireless device are operating in a wireless communication system, and the second wireless device operates in a sleep mode relying on reception of a wake-up signal, WUS, for waking up from the sleep mode, wherein the WUS is encoded and / or modulated with a lower complexity than signals used for communication of data in the wireless communication system, the method comprising: receiving (S212), from the first wireless device, a WUS, and initiating (S214) an action based on the received WUS.

13. The method according to claim 12, wherein the WUS is indicative of an action to be taken by the second wireless device.

14. The method according to claim 13, wherein the action comprises one or more of: starting a main receiver of the second wireless device, listening for discovery signals, transmitting discovery signals, performing a power transfer, obtaining sensor data, and transmitting messages to another wireless devices and / or a radio network node.

15. The method according to any of claims 12 to14, wherein the received WUS comprises a signalling sequence being indicative of the action to be initiated by the second wireless device.

16. The method according to claim 15, wherein the signalling sequence is indicative of the first wireless device being in one or more of: an emergency scenario, an out-of-coverage scenario, and an out-of-battery scenario.

17. The method according to any of claims 12-16, wherein the method comprises obtaining (S204) a WUS configuration, the WUS configuration being indicative of one or more of a signalling sequence associated with an action to be initiated by the second wireless device and a timing information associated with a reception behavior of the second wireless device.

18. The method according to any of claims 12 to 17, wherein obtaining (S204) the WUS configuration comprises receiving (S204A) the WUS configuration from a radio network node.

19. The method according to any of claims 12 to 18, wherein obtaining (S204) the WUS configuration comprises the second wireless device being pre-configured (S204B) with the WUS-configuration.

20. The method according to claim 19, wherein the method comprises receiving (S208), from the first wireless device, the pre-configured WUS configuration.

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