Devices and methods of communication
Patent Information
- Application Number
- PCT/CN2024/080104
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-05
- Publication Date
- 2025-10-02
AI Technical Summary
The use of a lower power wake up signal (LP-WUS) mode in idle or inactive states is incomplete and inefficient, leading to issues such as frequent transitions and power consumption in terminal devices due to poor decoding and false alarms.
Implementing methods and devices that manage transitions between LP-WUS and paging early indication (PEI) or paging message monitoring by setting thresholds and counters to optimize mode switching, reducing unnecessary transitions and improving monitoring performance.
This approach reduces power consumption and enhances communication efficiency by minimizing frequent mode switches and improving decoding reliability in terminal devices.
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Figure CN2024080104_02102025_PF_FP_ABST
Abstract
Description
DEVICES AND METHODS OF COMMUNICATIONTECHNICAL FIELD
[0001] Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices and computer storage media of communication for a lower power wake up signal (LP-WUS) mode.BACKGROUND
[0002] Currently, it has been proposed to use a main radio to describe a regular communication device performing normal radio resource control (RRC) states and additionally design a LP-WUS receiver to monitor a LP-WUS for turn-on of the main radio. When a terminal device is not receiving a service, the terminal device may enter a LP-WUS mode during which the main radio is turned off and the LP-WUS receiver is turned on to monitor the LP-WUS. When a LP-WUS is received, the terminal device may turn on the main radio and turn off the LP-WUS receiver. However, use of the LP-WUS mode in an idle or inactive state is still incomplete and needs to be further developed.SUMMARY
[0003] In general, embodiments of the present disclosure provide methods, devices and computer storage media of communication for a LP-WUS mode.
[0004] In a first aspect, there is provided a terminal device. The terminal device comprises a processor configured to cause the terminal device to: determine number of transitions between a first mode for monitoring a LP-WUS and a second mode for monitoring a paging early indication (PEI) or a paging message in a first period of time; in accordance with a determination that the number of transitions is greater than a number threshold, perform the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode; and in accordance with a determination that the number of transitions is smaller than the number threshold, perform the transition between the first mode and the second mode.
[0005] In a second aspect, there is provided a terminal device. The terminal device comprises a processor configured to cause the terminal device to: perform a LP-WUS monitoring in a first mode; and in accordance with a determination that a failure of a decoding of the LP-WUS or a false alarm issue happens for a predetermined number of times, transit from the first mode to a second mode for monitoring a PEI or a paging message.
[0006] In a third aspect, there is provided a terminal device. The terminal device comprises a processor configured to cause the terminal device to: in accordance with a determination that a first transition from a first mode for monitoring a LP-WUS to a second mode for monitoring a PEI or a paging message is performed, perform the monitoring of the LP-WUS during the first transition; and in accordance with a determination that a second transition from the second mode to the first mode is performed, perform the monitoring of the PEI or the paging message during the second transition.
[0007] In a fourth aspect, there is provided a method of communication. The method comprises: determining, at a terminal device, number of transitions between a first mode for monitoring a LP-WUS and a second mode for monitoring a PEI or a paging message in a first period of time; in accordance with a determination that the number of transitions is greater than a number threshold, performing the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode; and in accordance with a determination that the number of transitions is smaller than the number threshold, performing the transition between the first mode and the second mode.
[0008] In a fifth aspect, there is provided a method of communication. The method comprises: performing, at a terminal device, a LP-WUS monitoring in a first mode; and in accordance with a determination that a failure of a decoding of the LP-WUS or a false alarm issue happens for a predetermined number of times, transiting from the first mode to a second mode for monitoring a PEI or a paging message.
[0009] In a sixth aspect, there is provided a method of communication. The method comprises: in accordance with a determination that a first transition from a first mode for monitoring a LP-WUS to a second mode for monitoring a PEI or a paging message is performed, performing, at a terminal device, the monitoring of the LP-WUS during the first transition; and in accordance with a determination that a second transition from the second mode to the first mode is performed, performing the monitoring of the PEI or the paging message during the second transition.
[0010] In a seventh aspect, there is provided a computer readable medium having instructions stored thereon. The instructions, when executed on at least one processor, cause the at least one processor to perform the method according to any of the fourth to sixth aspects of the present disclosure.
[0011] Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Through the more detailed description of some embodiments of the present disclosure in the accompanying drawings, the above and other objects, features and advantages of the present disclosure will become more apparent, wherein:
[0013] FIG. 1A illustrates an example communication network in which some embodiments of the present disclosure can be implemented;
[0014] FIG. 1B illustrates an example structure of a terminal device in which some embodiments of the present disclosure can be implemented;
[0015] FIG. 1C illustrates a diagram illustrating LP-WUS monitoring in which some embodiments of the present disclosure can be implemented;
[0016] FIG. 1D illustrates a diagram illustrating paging and PEI monitoring in which some embodiments of the present disclosure can be implemented;
[0017] FIG. 1E illustrates an example scenario of a false alarm issue in a LP-WUS mode in which some embodiments of the present disclosure can be implemented;
[0018] FIG. 2 illustrates a signaling chart illustrating a process of communication according to embodiments of the present disclosure;
[0019] FIG. 3 illustrates a signaling chart illustrating another process of communication according to embodiments of the present disclosure;
[0020] FIG. 4 illustrates a diagram illustrating an example management for a transition between a LP-WUS monitoring and a PEI / paging monitoring according to embodiments of the present disclosure;
[0021] FIG. 5 illustrates a signaling chart illustrating another process of communication according to embodiments of the present disclosure;
[0022] FIG. 6 illustrates a signaling chart illustrating another process of communication according to embodiments of the present disclosure;
[0023] FIG. 7 illustrates a diagram illustrating an example monitoring during a mode transition according to embodiments of the present disclosure;
[0024] FIG. 8 illustrates an example method of communication implemented at a terminal device in accordance with some embodiments of the present disclosure;
[0025] FIG. 9 illustrates another example method of communication implemented at a terminal device in accordance with some embodiments of the present disclosure;
[0026] FIG. 10 illustrates still another example method of communication implemented at a terminal device in accordance with some embodiments of the present disclosure; and
[0027] FIG. 11 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
[0028] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0029] Principle of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitations as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.
[0030] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0031] As used herein, the term ‘terminal device’ refers to any device having wireless or wired communication capabilities. Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, ultra-reliable and low latency communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure / network, devices for integrated access and backhaul (IAB) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including satellites and high altitude platforms (HAPs) encompassing unmanned aircraft systems (UAS) , extended reality (XR) devices including different types of realities such as augmented reality (AR) , mixed reality (MR) and virtual reality (VR) , the unmanned aerial vehicle (UAV) commonly known as a drone which is an aircraft without any human pilot, devices on high speed train (HST) , or image capture devices such as digital cameras, sensors, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like. The ‘terminal device’ can further has ‘multicast / broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4 / IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporate one or multiple subscriber identity module (SIM) as known as multi-SIM. The term ‘terminal device’ can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
[0032] As used herein, the term ‘network device’ refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate. Examples of a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , and the like.
[0033] The terminal device or the network device may have Artificial intelligence (AI) or Machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
[0034] The terminal or the network device may work on several frequency ranges, e.g. FR1 (410 MHz to 7125 MHz) , FR2 (24.25GHz to 71GHz) , frequency band larger than 100GHz as well as Tera Hertz (THz) . It can further work on licensed / unlicensed / shared spectrum. The terminal device may have more than one connection with the network devices under Multi-Radio Dual Connectivity (MR-DC) application scenario. The terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
[0035] The embodiments of the present disclosure may be performed in test equipment, e.g. signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator.
[0036] In one embodiment, the terminal device may be connected with a first network device and a second network device. One of the first network device and the second network device may be a master node and the other one may be a secondary node. The first network device and the second network device may use different radio access technologies (RATs) . In one embodiment, the first network device may be a first RAT device and the second network device may be a second RAT device. In one embodiment, the first RAT device is eNB and the second RAT device is gNB. Information related with different RATs may be transmitted to the terminal device from at least one of the first network device or the second network device. In one embodiment, first information may be transmitted to the terminal device from the first network device and second information may be transmitted to the terminal device from the second network device directly or via the first network device. In one embodiment, information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device. Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
[0037] As used herein, the singular forms ‘a’ , ‘an’ and ‘the’ are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term ‘includes’ and its variants are to be read as open terms that mean ‘includes, but is not limited to. ’ The term ‘based on’ is to be read as ‘at least in part based on. ’ The term ‘one embodiment’ and ‘an embodiment’ are to be read as ‘at least one embodiment. ’ The term ‘another embodiment’ is to be read as ‘at least one other embodiment. ’ The terms ‘first, ’ ‘second, ’ and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below.
[0038] In some examples, values, procedures, or apparatus are referred to as ‘best, ’ ‘lowest, ’ ‘highest, ’ ‘minimum, ’ ‘maximum, ’ or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
[0039] In the context of the present disclosure, the term ‘a connected state’ may be interchangeably used with ‘an RRC_CONNECTED state’ , the term ‘an idle state’ may be interchangeably used with ‘an RRC_IDLE state’ , and the term ‘an inactive state’ may be interchangeably used with ‘an RRC_INACTIVE state’ .
[0040] In the context of the present disclosure, the term ‘turn on’ may be interchangeably used with ‘activated’ , ‘wake up’ , ‘switch on’ , ‘state transition’ or ‘warm up’ . In the context of the present disclosure, the term ‘turn off’ may be interchangeably used with ‘deactivated’ , ‘sleep’ , ‘switch off’ , ‘state transition’ , or ‘warm down’ .
[0041] In the context of the present disclosure, for an inactive or idle state, the term ‘LP-WUS mode’ may mean that UE monitors a LP-WUS within an inactive or idle state while a main radio is in ultra-deep-sleep or is non-active or is turned off. For a connected state, the term ‘LP-WUS mode’ may mean that UE monitors a LP-WUS within a connected state while a main radio is in light-sleep or micro-sleep or is non-active or is turned off. The term ‘LP-WUS mode’ may be interchangeably used with ‘LP-WUS state’ or any other suitable names.
[0042] In general, during a LP-WUS mode, a main radio may stay in a sleep mode. A terminal device may still stay in any RRC state (e.g., an idle or inactive or connected state) but may not perform regular operations in those RRC states. The terminal device may only need to monitor a LP-WUS or perform some actions related to a LP-WUS mode, e.g., synchronization and / or measurement in a LP-WUS mode.
[0043] In the context of the present disclosure, the term ‘LP-WUS’ is used to describe a signal sent by a network (NW) in a LP-WUS mode and monitored by a LP-WUS receiver of a terminal device. The term ‘LP-WUS’ may be interchangeably used with ‘ultra-low-power wake up signal’ or ‘wake up signal’ or any other suitable names. The term ‘LP-WUS-capable terminal device / cell’ may refer to a terminal device / cell supporting a LP-WUS mechanism.
[0044] Currently, a LP-WUS mechanism may be introduced to further reduce power consumption of a terminal device by replacing a PEI / paging monitoring with a LP-WUS monitoring in a LP-WUS mode. During the LP-WUS mode, a main radio is turned off and a LP-WUS receiver is turned on to monitor a LP-WUS. However, considering that the LP-WUS may be designed in a simple manner, a terminal device may not decode the LP-WUS very well especially when the terminal device stays in an edge of a cell. Thus, a transition between the LP-WUS monitoring and the PEI or paging monitoring may be considered so as to enhance communication efficiency.
[0045] In view of this, embodiments of the present disclosure provide solutions of communication so as to implement or manage the transition between the LP-WUS monitoring and the PEI or paging monitoring. In one aspect, a terminal device may determine number of transitions between a first mode for monitoring a LP-WUS and a second mode for monitoring a PEI or a paging message in a first period of time. If the number of transitions is greater than a number threshold, the terminal device may perform the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode. If the number of transitions is smaller than the number threshold, the terminal device may perform the transition between the first mode and the second mode. In this way, a frequent switching between a LP-WUS monitoring and a PEI / paging monitoring may be avoided and power consumption of the terminal device may be saved.
[0046] In another aspect, during a LP-WUS monitoring in a first mode, if a failure of a decoding of the LP-WUS or a false alarm issue happens for a predetermined number of times, a terminal device may transit from the first mode to a second mode for monitoring a PEI or a paging message. In this way, the terminal device may fall back to a PEI / paging monitoring if a problem occurs in a LP-WUS reception. Thus, monitoring performance of the terminal device may be improved.
[0047] In still another aspect, if a first transition from a first mode for monitoring a LP-WUS to a second mode for monitoring a PEI or a paging message is performed, a terminal device may perform the monitoring of the LP-WUS during the first transition. If a second transition from the second mode to the first mode, the terminal device may perform the monitoring of the PEI or the paging message during the second transition. In this way, a behavior of the terminal device during a transition between a LP-WUS monitoring and a PEI / paging may be specified, and monitoring performance of the terminal device may be improved.
[0048] Principles and implementations of the present disclosure will be described in detail below with reference to the figures.
[0049] EXAMPLE OF COMMUNICATION NETWORK
[0050] FIG. 1A illustrates a schematic diagram of an example communication network 100A in which some embodiments of the present disclosure can be implemented. As shown in FIG. 1A, the communication network 100A may comprise a terminal device 110 and a network device 120. The network device 120 may provide a serving cell (also referred to as a cell herein) 121 to serve one or more terminal devices. In this example, the terminal device 110 is shown as being located in the cell 121 and served by the network device 120.
[0051] The terminal device 110 and the network device 120 may communicate with each other via a channel such as a wireless communication channel. The communications in the communication network 100A may conform to any suitable standards including, but not limited to, global system for mobile communications (GSM) , long term evolution (LTE) , LTE-evolution, LTE-advanced (LTE-A) , new radio (NR) , wideband code division multiple access (WCDMA) , code division multiple access (CDMA) , GSM EDGE radio access network (GERAN) , machine type communication (MTC) and the like. The embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, 5.5G, 5G-advanced networks, or the sixth generation (6G) networks.
[0052] It is to be understood that the number of devices or cells in FIG. 1A is given for the purpose of illustration without suggesting any limitations to the present disclosure. The communication network 100A may include any suitable number of network devices and / or terminal devices and / cells adapted for implementing implementations of the present disclosure.
[0053] FIG. 1B illustrates a diagram 100B illustrating an example structure of a terminal device in which some embodiments of the present disclosure can be implemented. For convenience, FIG. 1B is described in connection with the terminal device 110 of FIG. 1A.
[0054] As shown in FIG. 1B, the terminal device 110 may comprise a LP-WUS receiver (LR) 141 and a main radio (MR) 142. The LP-WUS receiver 141 is configured to monitor a LP-WUS. The main radio 142 is configured as a regular communication device performing normal RRC states. It is to be understood that the LP-WUS receiver and the main radio may have any other suitable names.
[0055] In some embodiments, the LP-WUS receiver 141 may detect a LP-WUS indicating turn-off of the main radio 142, and trigger the main radio 142 to enter a turn-off or deep-sleep state. In the turn-off or deep-sleep state, the terminal device 110 is not required to process a RRC idle or inactive or connected state procedure. In some embodiments, the LP-WUS receiver 141 may detect a LP-WUS indicating turn-on of the main radio 142, and trigger the main radio 142 to enter a turn-on state. In the turn-on state, the main radio 142 may perform a PDCCH monitoring or perform a PEI / paging monitoring or directly initiate a random access (RA) procedure.
[0056] FIG. 1C illustrates a diagram 100C illustrating LP-WUS monitoring in which some embodiments of the present disclosure can be implemented. As shown in FIG. 1C, a LP-WUS monitoring may be performed in a LP-WUS mode at LP-WUS monitoring windows 150, 151 and 152. In this example, a LP-WUS 160 is received in the LP-WUS monitoring window 152. As shown in FIG. 1C, LP-SS / SSB measurement and synchronization may also be performed in the LP-WUS mode for LP-WUS reception.
[0057] FIG. 1D illustrates a diagram 100D illustrating paging and PEI monitoring in which some embodiments of the present disclosure can be implemented. As shown by a reference sign 170 in FIG. 1D, a paging monitoring may be performed in an idle or inactive state at one or more paging occasions (POs) (for convenience, only one PO 171 is shown) . In this example, no paging message is received at the PO 171. As shown by the reference sign 170 in FIG. 1D, SSB measurement and synchronization may also be performed for paging reception.
[0058] As shown by a reference sign 180 in FIG. 1D, a PEI monitoring may be performed in an idle or inactive state at one or more PEI occasions (for convenience, only one PEI occasion 181 is shown) , and SSB measurement and synchronization may also be performed for PEI reception. If a PEI is detected and the PEI indicates a subgroup UE belongs to monitor an associated PO, the UE may monitor the associated PO. If the UE does not detect PEI on the monitored PEI occasion or the detected PEI does not indicate the subgroup the UE belongs to monitor the associated PO, the UE may not be required to monitor the associated PO. In this example, no PEI is received at the PEI occasion 181, and the associated SSB measurement and synchronization and PO monitoring at a PO 182 are also not required to be performed.
[0059] FIG. 1E illustrates an example scenario 100E of a false alarm issue in a LP-WUS mode in which some embodiments of the present disclosure can be implemented. As shown in FIG. 1E, a subgroup comprising UE1, UE2 and UE3 may monitor a LP-WUS (i.e., a physical downlink shared channel (PDSCH) transmission) at the same LP-WUS monitoring window 190. It is assumed that a LP-WUS for UE3 is received at the LP-WUS monitoring window 190. Each of the UE1, UE2 and UE3 will receive and decode the LP-WUS for UE3. It can be seen that the LP-WUS is received by the UE1 and UE2 but the LP-WUS is not intended for the UE1 and UE2. Thus, it is considered that a false alarm issue happens at the UE1 and the UE2.
[0060] Embodiments of the present disclosure provide solutions of communication for a transition between a LP-WUS monitoring and a PEI / paging monitoring so as to enhance use of a LP-WUS mode in an idle or inactive state. Detailed description will be given in connection with Figs. 2 to 7 below.
[0061] EXAMPLE IMPLEMENTATION OF CONDITIONS FOR MODE TRANSITION
[0062] Embodiments of the present disclosure provide a solution of a transition between a LP-WUS monitoring and a PEI / paging monitoring. In the solution, considering that the main radio and the LP-WUS receiver may have different signal reception sensitivity, an entry condition for a LP-WUS monitoring and a leaving condition for the LP-WUS monitoring are defined or optimized by introducing different parameters for a LP-SS measurement and a SSB measurement respectively, such as quality thresholds, quality offsets, and / or time durations. The solution will be detailed in connection with FIG. 2 below.
[0063] FIG. 2 illustrates a signaling chart illustrating a process 200 of communication according to embodiments of the present disclosure. For the purpose of discussion, the process 200 will be described with reference to FIGs. 1A and 1B. The process 200 may involve the terminal device 110 and the network device 120 as illustrated in FIG. 1A. It is to be understood that the steps and the order of the steps in FIG. 2 are merely for illustration, and not for limitation. For example, the order of the steps may be changed. Some of the steps may be omitted or any other suitable additional steps may be added.
[0064] As shown in FIG. 2, the network device 120 may transmit 210, to the terminal device 110, a configuration for a LP-WUS monitoring. In some embodiments, the configuration may indicate a set of time windows for the LP-WUS monitoring. In some embodiments, the configuration may indicate an entry condition and / or a leaving condition for a LP-WUS monitoring. In the context of the present disclosure, the entry condition may be considered as a condition for transiting from a PEI / paging monitoring to a LP-WUS monitoring, and the leaving condition may be considered as a condition for transiting from a LP-WUS monitoring to a PEI / paging monitoring. It is to be understood that the configuration may also comprise any other suitable information.
[0065] In some embodiments, the entry condition for the LP-WUS monitoring may comprise that signal quality measured based on a SSB in a mode (may also be referred to as a second mode herein) for monitoring a PEI / paging is higher than or equal to a first quality threshold. For example, the entry condition for the LP-WUS monitoring may be expressed by equation (1) below. QSSB1 ≥ Th1 (1)
[0066] where QSSB1 denotes the signal quality measured based on the SSB in the second mode, and Th1 denotes the first quality threshold.
[0067] In some embodiments, the entry condition for the LP-WUS monitoring may comprise that the signal quality measured based on the SSB in the second mode is higher than or equal to the first quality threshold in a first time duration. In this way, a more precise entry condition may be provided due to introduction of a time duration parameter. Thus, a terminal device may make better selection between a LP-WUS monitoring and a PEI / paging monitoring.
[0068] In some embodiments, the entry condition for the LP-WUS monitoring may comprise that a sum or difference of the signal quality measured based on the SSB in the second mode and a first quality offset is higher than or equal to the first quality threshold. For example, the entry condition for the LP-WUS monitoring may be expressed by equation (2) below. QSSB1 ± Qoffset1 ≥ Th1 (2)
[0069] where QSSB1 denotes the signal quality measured based on the SSB in the second mode, Qoffset1 denotes the first quality offset, and Th1 denotes the first quality threshold. In this way, a more precise entry condition may be provided due to introduction of a quality threshold parameter. Thus, a terminal device may also make better selection between a LP-WUS monitoring and a PEI / paging monitoring.
[0070] In some embodiments, the entry condition for the LP-WUS monitoring may comprise that the sum or difference of the signal quality measured based on the SSB in the second mode and the first quality offset is higher than or equal to the first quality threshold in the first time duration. In this way, an entry condition may be further optimized due to due to introduction of quality threshold and time duration parameters. Thus, an optimized selection between a LP-WUS monitoring and a PEI / paging monitoring may be facilitated.
[0071] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that signal quality measured based on a LP-SS in a mode (may also be referred to as a first mode herein) for monitoring a LP-WUS is lower than or equal to a second quality threshold. For example, the leaving condition for the LP-WUS monitoring may be expressed by equation (3) below. QLP-SS ≤ Th2 (3)
[0072] where QLP-SS denotes the signal quality measured based on the LP-SS in the first mode, and Th2 denotes the second quality threshold.
[0073] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that the signal quality measured based on the LP-SS in the first mode is lower than or equal to the second quality threshold in a second time duration. In this way, a more precise leaving condition may be provided due to introduction of a time duration parameter. Thus, a terminal device may make better selection between a LP-WUS monitoring and a PEI / paging monitoring.
[0074] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that a sum or difference of the signal quality measured based on the LP-SS in the first mode and a second quality offset is lower than or equal to the second quality threshold. For example, the leaving condition for the LP-WUS monitoring may be expressed by equation (4) below. QLP-SS ± Qoffset2 ≤ Th2 (4)
[0075] where QLP-SS denotes the signal quality measured based on the LP-SS in the first mode, Qoffset2 denotes the second quality offset, and Th2 denotes the second quality threshold. In this way, a more precise leaving condition may be provided due to introduction of a quality threshold parameter. Thus, a terminal device may also make better selection between a LP-WUS monitoring and a PEI / paging monitoring.
[0076] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that the sum or difference of the signal quality measured based on the LP-SS in the first mode and the second quality offset is lower than or equal to the second quality threshold in the second time duration. In this way, an entry condition may be further optimized due to due to introduction of quality threshold and time duration parameters. Thus, an optimized selection between a LP-WUS monitoring and a PEI / paging monitoring may be facilitated.
[0077] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that signal quality measured based on a SSB in the first mode is lower than or equal to a third quality threshold. For example, the leaving condition for the LP-WUS monitoring may be expressed by equation (5) below. QSSB2 ≤ Th3 (5)
[0078] where QSSB2 denotes the signal quality measured based on the SSB in the first mode, and Th3 denotes the third quality threshold.
[0079] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that the signal quality measured based on the SSB in the first mode is lower than or equal to the third quality threshold in a third time duration. In this way, a more precise leaving condition may be provided due to introduction of a time duration parameter. Thus, a terminal device may make better selection between a LP-WUS monitoring and a PEI / paging monitoring.
[0080] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that a sum or difference of the signal quality measured based on the SSB in the first mode and a third quality offset is lower than or equal to the third quality threshold. For example, the leaving condition for the LP-WUS monitoring may be expressed by equation (4) below. QSSB2 ± Qoffset3 ≤ Th3 (6)
[0081] where QSSB2 denotes the signal quality measured based on the SSB in the first mode, Qoffset3 denotes the third quality offset, and Th3 denotes the third quality threshold. In this way, a more precise leaving condition may be provided due to introduction of a quality threshold parameter. Thus, a terminal device may also make better selection between a LP-WUS monitoring and a PEI / paging monitoring.
[0082] In some embodiments, the leaving condition for the LP-WUS monitoring may comprise that the sum or difference of the signal quality measured based on the SSB in the first mode and the third quality offset is lower than or equal to the third quality threshold in the third time duration. In this way, an entry condition may be further optimized due to due to introduction of quality threshold and time duration parameters. Thus, an optimized selection between a LP-WUS monitoring and a PEI / paging monitoring may be facilitated.
[0083] As shown in FIG. 2, in some embodiments, the terminal device 110 may transmit 211, to the network device 120, assistance information related to the entry or leaving condition. In some embodiments, if the terminal device 110 is configured for evaluating the entry or leaving condition for the LP-WUS monitoring, the terminal device 110 may transmit its preference on one or more parameters in the entry or leaving condition to the network device 120 via a RRC message (e.g., a UE assistance information message) once the terminal device 110 reverts back to a connected state.
[0084] In some embodiments, the assistance information may comprise at least one of the following: a preference on the first quality threshold; a preference on the second quality threshold; a preference on the third quality threshold; a preference on the first quality offset; a preference on the second quality offset; a preference on the third quality offset; a preference on the first time duration; a preference on the second time duration; a preference on the third time duration; or a request for a condition for entering or leaving the first mode (i.e., a request for the entry or leaving condition of the LP-WUS monitoring) .
[0085] For illustration, an example procedure of assistance information transmission may be described as below.
[0086] UE capable of providing parameters related to entry / leaving condition for LP-WUS monitoring may initiate the procedure if it was configured to do so, upon the UE preferred parameters is available.
[0087] Upon initiating the procedure, the UE shall:
[0088] 1> if configured to provide parameters related to entry / leaving condition for LP-WUS monitoring:
[0089] 2> if the UE did not transmit a UEAssistanceInformation message with parameters related to entry / leaving condition for LP-WUS monitoring; or
[0090] 2> if the current parameters related to entry / leaving condition for LP-WUS monitoring is different from the one indicated in the last transmission of the UEAssistanceInformation message:
[0091] 3> initiate transmission of the UEAssistanceInformation message to provide parameters related to entry / leaving condition for LP-WUS monitoring; The UE shall set the contents of the UEAssistanceInformation message as follows: 1> if the UE preferred threshold1_SSB, threshold2_LP-WUS, threshold3_SSB, Offset1_SSB, Offset2_LP-WUS, Offset3_SSB, TimeToTrigger, request for entry / leaving condition are available:
[0092] 2> include the corresponding preferred parameters in the UEAssistanceInformation.
[0093] 1> submit the UEAssistanceInformation message to lower layers for transmission.
[0094] In this example procedure, an information element (IE) ‘threshold1_SSB’ denotes the first quality threshold, an IE ‘threshold2_LP-WUS’ denotes the second quality threshold, an IE ‘threshold3_SSB’ denotes the third quality threshold, an IE ‘Offset1_SSB’ denotes the first quality offset, an IE ‘Offset2_LP-WUS’ denotes the second quality offset, an IE ‘Offset3_SSB’ denotes the third quality offset, and an IE ‘TimeToTrigger’ denotes the first or second or third time duration. In this example, all of the first time duration, the second time duration and the third time duration are a time to trigger.
[0095] With reference to FIG. 2, in some embodiments, based on the assistance information, the network device 120 may generate and transmit 212 the configuration indicating the entry and / or leaving condition for the LP-WUS monitoring. Alternatively, the network device 120 may also generate and transmit the configuration without the assistance information.
[0096] Continuing to refer to FIG. 2, the terminal device 110 may perform 220 the transition between the first mode and the second mode (i.e., the transition between the LP-WUS monitoring and the PEI / paging monitoring) by evaluating the entry and leaving conditions for the LP-WUS monitoring.
[0097] In some embodiments, when the terminal device 110 is in the second mode of monitoring a PEI or paging message (i.e., the main radio 142 is turn-on and the LP-WUS receiver 141 is turn-off) , the terminal device 110 may evaluate the entry condition (i.e., determine whether the entry condition is fulfilled) . If the entry condition for the LP-WUS monitoring is fulfilled, the terminal device 110 may transit from the second mode to the first mode, i.e., transit from the PEI / paging monitoring to the LP-WUS monitoring.
[0098] In some embodiments, when the terminal device 110 is in the first mode of monitoring a LP-WUS (i.e., the main radio 142 is turn-off and the LP-WUS receiver 141 is turn-on) , the terminal device 110 may evaluate the leaving condition (i.e., determine whether the leaving condition is fulfilled) . if the leaving condition for the LP-WUS monitoring is fulfilled, the terminal device 110 may transit from the first mode to the second mode, i.e., transit from the LP-WUS monitoring to the PEI / paging monitoring.
[0099] For illustration, an example procedure may be described as below.
[0100] Upon reception of LP-WUS / PEI / paging configuration, UE shall:
[0101] 1> if the UE’MR is ON (means staying in normal RRC_IDLE / INACTIVE) and the entry condition of LP-WUS monitoring is configured:
[0102] 2> perform SSB measurements for evaluating the entry condition:
[0103] 3> if the entry condition is fulfilled:
[0104] 4> enter ultra-deep-sleep mode;
[0105] 4> monitor LP-WUS;
[0106] 1> if the UE is in ultra-deep-sleep (means monitoring LP-WUS mode) and the leaving condition of LP-WUS monitoring is configured:
[0107] 2> perform LP-SS / SSB measurements for evaluating the leaving condition:
[0108] 3> if the leaving condition is fulfilled:
[0109] 4> exit ultra-deep-sleep mode (enter normal RRC_IDLE / INACTVE)
[0110] 4> monitor PEI / paging.
[0111] Entry condition for LP-WUS monitoring:
[0112] The UE shall consider the entry condition to be satisfied when the below formula is fulfilled:
[0113] Signal quality measured based on SSB (± Offset1_SSB) ≥ threshold1_SSB (during timeToTrigger)
[0114] Leaving condition for LP-WUS monitoring:
[0115] The UE shall consider the leaving condition to be satisfied when the below formula is fulfilled:
[0116] Signal quality measured based on LP-SS (± Offset2_LP-SS) ≤ threshold2_LP-SS (during timeToTrigger) , or
[0117] Signal quality measured based on SSB (± Offset3_SSB) ≤ threshold3_SSB (during timeToTrigger.
[0118] In this example procedure, an IE ‘threshold1_SSB’ denotes the first quality threshold, an IE ‘threshold2_LP-WUS’ denotes the second quality threshold, an IE ‘threshold3_SSB’ denotes the third quality threshold, an IE ‘Offset1_SSB’ denotes the first quality offset, an IE ‘Offset2_LP-WUS’ denotes the second quality offset, an IE ‘Offset3_SSB’ denotes the third quality offset, and an IE ‘TimeToTrigger’ denotes the first or second or third time duration. In this example, all of the first time duration, the second time duration and the third time duration are a time to trigger.
[0119] With the process 200, an entry and / or leaving condition for a LP-WUS monitoring may be optimized and an optimized selection between a LP-WUS monitoring and a PEI / paging monitoring may be facilitated.
[0120] It is to be understood that the above example process is merely for illustration and are not intended for limitation. It is also to be understood that operations in the process 200 may be carried out separately or in any suitable combination.
[0121] EXAMPLE IMPLEMENTATION OF MANAGEMENT OF MODE TRANSITION
[0122] Embodiments of the present disclosure also provide a solution of managing a transition between a LP-WUS monitoring and a PEI / paging monitoring. In the solution, a counter may be introduced to count number of transitions between the LP-WUS monitoring and the PEI / paging monitoring. The number of transitions may be used for determine whether to continue the transition. The solution will be detailed in connection with FIG. 3 below.
[0123] FIG. 3 illustrates a signaling chart illustrating another process 300 of communication according to embodiments of the present disclosure. For the purpose of discussion, the process 300 will be described with reference to FIGs. 1A and 1B. The process 300 may involve the terminal device 110 and the network device 120 as illustrated in FIG. 1A. It is to be understood that the steps and the order of the steps in FIG. 3 are merely for illustration, and not for limitation. For example, the order of the steps may be changed. Some of the steps may be omitted or any other suitable additional steps may be added.
[0124] As shown in FIG. 3, the terminal device 110 may receive 310, from the network device 120, a configuration indicating an entry or leaving condition for a LP-WUS monitoring. This step 310 may be carried out as that described for the step 210. It is to be understood that the step 310 may also be carried out in any other suitable ways.
[0125] With reference to FIG. 3, the terminal device 110 may perform 320 a transition between a first mode for monitoring a LP-WUS and a second mode for monitoring a PEI / paging message. In some embodiments, the terminal device 110 may evaluate the entry or leaving condition for the LP-WUS monitoring. If the entry condition is fulfilled, the terminal device 110 may transit from the second mode to the first mode. If the leaving condition is fulfilled, the terminal device 110 may transit from the first mode to the second mode. This step 320 may be carried out as that described for the step 220. It is to be understood that the step 320 may also be carried out in any other suitable ways.
[0126] Continuing to refer to FIG. 3, the terminal device 110 may determine 330 number of transitions between the first mode and the second mode in a period of time (also referred to as a first period of time herein) . In some embodiments, the terminal device 110 may initialize a counter to a predetermined value (e.g., zero) .
[0127] In some embodiments, if the terminal device 110 transits from the first mode to the second mode or transits from the second mode to the first mode, the terminal device 110 may increment a value of the counter while starting or restarting a first timer corresponding to the first period of time. Based on the value of the counter, the terminal device 110 may determine the number of transitions based on the value of the counter.
[0128] With reference to FIG. 3, if the number of transitions is greater than a number threshold, the terminal device 110 may perform 340 the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode. In other words, if the number of transitions is greater than the number threshold, the terminal device 110 may not evaluate the entry or leaving condition for the LP-WUS monitoring, and may not perform the LP-WUS monitoring.
[0129] In some embodiments, if the number of transitions is greater than the number threshold, the terminal device 110 may stop the first timer and start a second timer. During running of the second timer, the terminal device 110 may perform the PEI / paging monitoring without the transition. That is, during the running of the second timer, the terminal device 110 may not evaluate the entry or leaving condition for the LP-WUS monitoring, and may not perform the LP-WUS monitoring. The second timer may be a prohibit timer.
[0130] In some embodiments, if the configuration is updated, the terminal device 110 may stop the second timer. In some embodiments, if the terminal device 110 is reverted back to a connected state, the terminal device 110 may stop the second timer. In some embodiments, if the second timer expires, the terminal device 110 may be allowed to perform the transition between the first mode and the second mode again.
[0131] With reference to FIG. 3, if the number of transitions is smaller than the number threshold, the terminal device 110 may perform 350 the transition between the first mode and the second mode. In other words, if the number of transitions is smaller than the number threshold, the terminal device 110 may continue to evaluate the entry or leaving condition for the LP-WUS monitoring, and may continue to perform the transition between the LP-WUS monitoring and the PEI / paging monitoring.
[0132] In some embodiments, if the first timer expires and the number of transitions is smaller than the number threshold, the terminal device 110 may reset the value of the counter (e.g., to zero) . In this case, the terminal device 110 may continue to manage the transition between the LP-WUS monitoring and the PEI / paging monitoring by repeating the steps 330 to 350.
[0133] In some embodiments, if the number of transitions is equal to the number threshold, the terminal device 110 may perform the PEI / paging monitoring in the second mode without the transition between the first mode and the second mode. In some alternative embodiments, if the number of transitions is equal to the number threshold, the terminal device 110 may continue to perform the transition between the first mode and the second mode.
[0134] For illustration, an example procedure of managing the transition may be described as below.
[0135] Upon reception of LP-WUS / PEI / paging configuration, UE shall:
[0136] 1> if the UE transits from LP-WUS monitoring to PEI / paging monitoring, or,
[0137] 1> if the UE transits from PEI / paging monitoring to LP-WUS monitoring:
[0138] 2> the counter of transition is incremented by 1;
[0139] 2> start / restart timer 1 (counter timer) ;
[0140] 2> if the counter of transition is greater than (or equal to) the threshold_transition:
[0141] 3> stop timer 1;
[0142] 3> start timer 2 (prohibit timer) .
[0143] 1> if the timer 1 expires:
[0144] 2> reset the counter of transition to 0;
[0145] 1> if the timer 2 is running:
[0146] 2> the UE is not allowed to evaluate the switching criterion between LP- WUS monitoring and PEI / paging monitoring, i.e., transition procedure between LP-WUS monitoring and PEI / paging monitoring is not allowed.
[0147] In this example procedure, threshold_transition denotes the number threshold, the timer 1 denotes the first timer, and the timer 2 denotes the second timer.
[0148] FIG. 4 illustrates a diagram 400 illustrating an example management for a transition between a LP-WUS monitoring and a PEI / paging monitoring according to embodiments of the present disclosure. In this example, it is assumed that the number threshold is 3.
[0149] As shown in FIG. 4, at a timing A, the terminal device 110 starts a PEI monitoring and sets a value of a counter to 1. Meanwhile, the terminal device 110 starts timer 1. At a timing B, an entry condition for the LP-WUS monitoring is fulfilled, and thus the terminal device 110 transits from the PEI monitoring to the LP-WUS monitoring and sets the value of the counter to 2. The terminal device 110 may restart the timer 1 at the timing B. At a timing C, a leaving condition for the LP-WUS monitoring is fulfilled, and thus the terminal device 110 transits from the LP-WUS monitoring to the PEI monitoring and set the value of the counter to 3 (i.e., equal to the number threshold) . Thus, at the timing C, the terminal device 110 may stop the timer 1 and start timer 2. During running of the timer 2, the terminal device 110 is not allowed to monitor the LP-WUS.
[0150] With the process 300, a transition between a LP-WUS monitoring and a PEI / paging monitoring may be managed. A frequent transition may be avoided and unnecessary power consumption may be avoided. It is to be understood that the above example process is merely for illustration and are not intended for limitation. It is also to be understood that operations in the process 300 may be carried out separately or in any suitable combination.
[0151] EXAMPLE IMPLEMENTATION OF FALLBACK FROM LP-WUS MODE
[0152] Embodiments of the present disclosure also provide a solution of falling back to a PEI / paging monitoring if LP-WUS reception has a problem. The solution will be detailed in connection with FIG. 5 below.
[0153] FIG. 5 illustrates a signaling chart illustrating another process 500 of communication according to embodiments of the present disclosure. For the purpose of discussion, the process 500 will be described with reference to FIGs. 1A and 1B. The process 500 may involve the terminal device 110 and the network device 120 as illustrated in FIG. 1A. It is to be understood that the steps and the order of the steps in FIG. 5 are merely for illustration, and not for limitation. For example, the order of the steps may be changed. Some of the steps may be omitted or any other suitable additional steps may be added.
[0154] As shown in FIG. 5, the terminal device 110 may receive 510, from the network device 120, a configuration for a LP-WUS monitoring. This step 510 may be carried out as that described for the step 210. It is to be understood that the step 510 may also be carried out in any other suitable ways.
[0155] With reference to FIG. 5, the terminal device 110 may perform 520 the LP-WUS monitoring upon entering a LP-WUS mode (also referred to as a first mode herein) . During the LP-WUS monitoring, the terminal device 110 may determine 530 whether a problem in LP-WUS reception happens.
[0156] With reference to FIG. 5, in some embodiments, the terminal device 110 may determine 531 that a failure of a decoding of a LP-WUS happens for a predetermined number of times (denoted as N times) . In other words, the terminal device 110 may continuously detect the LP-WUS decoding failure for the predetermined number of times. In this case, the terminal device 110 may determine that the problem in LP-WUS reception happens. In some embodiments, the predetermined number of times may be greater than or equal to 1.
[0157] With reference to FIG. 5, in some embodiments, the terminal device 110 may determine 532 that a false alarm issue happens for the predetermined number of times. In other words, the terminal device 110 may continuously detect the false alarm issue for the predetermined number of times. In this case, the terminal device 110 may determine that the problem in LP-WUS reception happens.
[0158] Continuing to refer to FIG. 5, upon the problem in LP-WUS reception happens in the LP-WUS mode, the terminal device 110 may transit 540 from the LP-WUS mode to a mode (also referred to as a second mode herein, e.g., an idle or inactive state) for monitoring a PEI or a paging message. In some embodiments, the terminal device 110 may exit the LP-WUS mode and monitor the PEI or the paging message in the idle or inactive state.
[0159] In some embodiments, if the terminal device 110 in the LP-WUS mode continuously fails to decode LP-WUS for N times, the terminal device 110 may fall back to the PEI or paging monitoring mode. In this case, besides signal quality as a criterion for leaving the LP-WUS mode, LP-WUS decoding performance may also be considered as a criterion for leaving the LP-WUS mode. If the terminal device 110 continuously fails to decode the LP-WUS, it may also mean that the signal quality of the terminal device 110 is not good enough for support the LP-WUS monitoring. Thus, the terminal device 110 may need to monitor a PEI or paging message.
[0160] In some embodiments, if the terminal device 110 in the LP-WUS mode continuously considers a false alarm issue happens for N times, the terminal device 110 may fall back to the PEI or paging monitoring mode. As for the false alarm issue, it means that due to subgroup capacity of a LP-WUS is not sufficient, the terminal device 110 may always detect the LP-WUS but the LP-WUS is intended for other terminal devices. Thus, unnecessary wake-up happens, and the terminal device 110 may need to monitor a PEI or paging message.
[0161] In this case, even if the terminal device 110 is fulfilling an entry condition for the LP-WUS monitoring, the terminal device 110 may still not perform the LP-WUS monitoring due to low LP-WUS monitoring performance. Thus, monitoring performance of the terminal device 110 may be improved.
[0162] Continuing to refer to FIG. 5, the terminal device 110 may report 550 the problem in the LP-WUS reception. In some embodiments, the terminal device 110 may store 551 information of the failure of the decoding of the LP-WUS or the false alarm issue in a variable of the terminal device 110. Upon entering a connected state, the terminal device 110 may report 552, to the network device 120, the information of the failure of the decoding of the LP-WUS or the false alarm issue. For example, whenever the terminal device 110 returns to the connected state, the terminal device 110 may report the information in dedicated RRC signaling.
[0163] In some embodiments, the terminal device 110 may initiate 553 a random access to the network device 120 for reporting the information of the failure of the decoding of the LP-WUS or the false alarm issue. For example, when the failure of the decoding of the LP-WUS or the false alarm issue happens, the terminal device 110 may initiate the random access to enter the connected state for reporting the information of the failure of the decoding of the LP-WUS or the false alarm issue.
[0164] Continuing to refer to FIG. 5, based on the information reported by the terminal device 110, the network device 120 may modify 560 the configuration for the LP-WUS monitoring so as to facilitate better performance of the terminal device 110. It is to be understood that the network device 120 may modify the configuration for the LP-WUS monitoring based on network implementation.
[0165] For illustration, an example fallback procedure may be described as below.
[0166] Upon in ultra-deep-sleep mode, UE shall:
[0167] 1> monitoring LP-WUS occasion based on LP-WUS configuration;
[0168] 1> if continuously fail to decode LP-WUS occasions for N timers, or,
[0169] 1> if continuously consider false alarm issue happens for N times:
[0170] 2> exit ultra-deep-sleep mode (enter normal RRC_IDLE / INACTVE) ,
[0171] 2> monitor PEI if configured; or
[0172] 2> monitor paging.
[0173] 1> if decode failure or false alarm event happens (e.g., for N times) :
[0174] (option 1)
[0175] 2> store the events in UE variable;
[0176] 2> report the events to NW (via dedicated RRC signaling) whenever return to RRC_CONNECTED,
[0177] (option 2)
[0178] 2> initiate random access for reporting the events to NW.
[0179] NOTE: false alarm issue means the UE detect LP-WUS but this signal is intended for other UE, then the UE would receive an unnecessary paging.
[0180] With the process 500, a terminal device may fall back to a PEI / paging monitoring if LP-WUS reception has a problem. A frequent transition may be avoided and unnecessary power consumption may be avoided. It is to be understood that the above example process is merely for illustration and are not intended for limitation. It is also to be understood that operations in the process 500 may be carried out separately or in any suitable combination.
[0181] EXAMPLE IMPLEMENTATION OF UE BEHAVIOR DURING MODE TRANSITION
[0182] Embodiments of the present disclosure provide another solution of managing a transition between a LP-WUS monitoring and a PEI / paging monitoring. In the solution, UE behavior during the transition is defined. The solution will be detailed in connection with FIG. 6 below.
[0183] FIG. 6 illustrates a signaling chart illustrating a process 600 of communication according to embodiments of the present disclosure. For the purpose of discussion, the process 600 will be described with reference to FIGs. 1A and 1B. The process 600 may involve the terminal device 110 and the network device 120 as illustrated in FIG. 1A. It is to be understood that the steps and the order of the steps in FIG. 6 are merely for illustration, and not for limitation. For example, the order of the steps may be changed. Some of the steps may be omitted or any other suitable additional steps may be added.
[0184] As shown in FIG. 6, the terminal device 110 may receive 610, from the network device 120, a configuration for a LP-WUS monitoring. This step 610 may be carried out as that described for the step 210. It is to be understood that the step 610 may also be carried out in any other suitable ways.
[0185] With reference to FIG. 6, the terminal device 110 may perform 620 a transition between a first mode of monitoring a LP-WUS and a second mode of monitoring a PEI or paging message. This step 620 may be carried out as that described for the step 220. It is to be understood that the step 620 may also be carried out in any other suitable ways.
[0186] With reference to FIG. 6, in some embodiments, if a transition (also referred to as a first transition herein) from the first mode (i.e., LP-WUS monitoring) to the second mode (i.e., PEI / paging monitoring) is performed, the terminal device 110 may continue to perform 621 the LP-WUS monitoring during the first transition. In some embodiments, the terminal device 110 may perform the LP-WUS monitoring until the main radio 142 of the terminal device 110 is fully turn-on or active. In this way, a LP-WUS during the first transition may not be missed, and monitoring performance may be improved.
[0187] With reference to FIG. 6, in some embodiments, if a transition (also referred to as a second transition herein) from the second mode (i.e., PEI / paging monitoring) to the first mode (i.e., LP-WUS monitoring) is performed, the terminal device 110 may continue to perform 622 the PEI / paging monitoring during the second transition. In some embodiments, the terminal device 110 may perform the PEI / paging monitoring until the LP-WUS receiver 141 of the terminal device 110 is fully turn-on or active. In this way, a PEI or paging message during the second transition may not be missed, and monitoring performance may be improved.
[0188] Continuing to refer to FIG. 6, in some embodiments, if the PEI or the paging message is received during the second transition, the terminal device 110 may stop 623 the second transition. In this case, the terminal device 110 may still keep the main radio 142 turn-on or active to receive the PEI or paging message. In this way, unnecessary transition may be avoided and power consumption may be saved.
[0189] As shown in FIG. 6, in some embodiments, if a false alarm issue happens for the reception of the PEI or paging message, i.e., if the PEI or paging message is not intended for the terminal device 110, the terminal device 110 may resume 624 the second transition. In this way, necessary transition may be facilitated and monitoring performance may be improved.
[0190] For illustration, an example procedure of managing the transition may be described as below.
[0191] Upon in normal RRC_IDLE / INACTIVE, UE shall:
[0192] 1> if the entry condition for LP-WUS monitoring is fulfilled:
[0193] 2> enter ultra-deep-sleep mode, i.e., turn on the LR to monitor LP-WUS;
[0194] 2> continue monitoring PEI / paging (i.e., keep MR turn-on) until the LR is fully turn-on (i.e., active) ;
[0195] 2> if the PEI / paging is received during transition procedure:
[0196] 3> abort / stop entering ultra-deep-sleep mode;
[0197] 3> if false alarm issue happens for this PEI / paging reception:
[0198] 4> resume transition to enter ultra-deep-sleep.
[0199] Upon in ultra-deep-sleep, the UE shall:
[0200] 1> if the leaving condition for LP-WUS monitoring is fulfilled:
[0201] 2> leave ultra-deep-sleep mode, i.e., turn on the MR to monitor PEI / paging;
[0202] 2> continue monitoring LP-WUS (i.e., keep LR turn-on) until the MR is fully turn-on (i.e., active) .
[0203] FIG. 7 illustrates a diagram 700 illustrating an example monitoring during a mode transition according to embodiments of the present disclosure. As shown in FIG. 7, at a timing D, a transition from a PEI / paging monitoring to a LP-WUS monitoring is triggered. During the PEI / paging monitoring, the MR is turn-on and the LR is turn-off. During the transition from the PEI / paging monitoring to the LP-WUS monitoring, the LR is ramp-up and PEI / paging monitoring is still performed until the LR is fully turn-on at a timing E. During the LP-WUS monitoring, the MR is turn-off and the LR is turn-on.
[0204] When the MR is turn-on, the MR is in an active mode and may monitor PEI or paging message like in an idle or inactive state. When the LR is turn-on, the LR is in an active mode and may monitor LP-WUS / LP-SS in a LP-WUS mode.
[0205] With the process 600, UE behavior during a transition between a LP-WUS monitoring and a PEI / paging monitoring may be specified and monitoring performance of a terminal device may be improved. It is to be understood that the above example process is merely for illustration and are not intended for limitation. It is also to be understood that operations in the above processes 200, 300, 500 and 600 may be carried out separately or in any suitable combination.
[0206] EXAMPLE IMPLEMENTATION OF METHODS
[0207] Corresponding to the above processes, embodiments of the present disclosure provide methods of communication implemented at a terminal device and at a network device. These methods will be described below with reference to FIGs. 8 to 10.
[0208] FIG. 8 illustrates an example method 800 of communication implemented at a terminal device in accordance with some embodiments of the present disclosure. For example, the method 800 may be performed at the terminal device 110 as shown in FIG. 1A. For the purpose of discussion, in the following, the method 800 will be described with reference to FIG. 1A. It is to be understood that the method 800 may include additional blocks not shown and / or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
[0209] At block 810, the terminal device 110 may determine number of transitions between a first mode for monitoring a LP-WUS and a second mode for monitoring a PEI or a paging message in a first period of time.
[0210] In some embodiments, if the terminal device 110 transits from the first mode to the second mode or transits from the second mode to the first mode, the terminal device 110 may increment a value of a counter while starting or restarting a first timer corresponding to the first period of time, and determine the number of transitions based on the value of the counter.
[0211] At block 820, the terminal device 110 may determine whether the number of transitions is greater than or smaller than a number threshold.
[0212] As shown in FIG. 8, if the number of transitions is greater than the number threshold, the method 800 proceeds to block 830. At block 830, the terminal device 110 may perform the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode.
[0213] In some embodiments, if the number of transitions is greater than the number threshold, the terminal device 110 may stop the first timer while starting a second timer, and perform the monitoring of the PEI or the paging message without the transition during running of the second timer.
[0214] As shown in FIG. 8, if the number of transitions is not greater than the number threshold (e.g., smaller than or equal to the number threshold) , the method 800 proceeds to block 840. At block 840, the terminal device 110 may perform the transition between the first mode and the second mode.
[0215] In some embodiments, if the first timer expires, the terminal device 110 may reset the value of the counter.
[0216] In some embodiments, the terminal device 110 may transit from the second mode to the first mode based on one of the following: a sum or difference of signal quality measured based on a SSB in the second mode and a first quality offset is higher than or equal to a first quality threshold in a first time duration; the sum or difference of the signal quality measured based on the SSB in the second mode and the first quality offset is higher than or equal to the first quality threshold; or the signal quality measured based on the SSB in the second mode is higher than or equal to the first quality threshold in the first time duration.
[0217] In some embodiments, the terminal device 110 may transit from the first mode to the second mode based on one of the following: a sum or difference of signal quality measured based on a LP-SS in the first mode and a second quality offset is lower than or equal to a second quality threshold in a second time duration; the sum or difference of the signal quality measured based on the LP-SS in the first mode and the second quality offset is lower than or equal to the second quality threshold; the signal quality measured based on the LP-SS in the first mode is lower than or equal to the second quality threshold in the second time duration; a sum or difference of signal quality measured based on the SSB in the first mode and a third quality offset is lower than or equal to a third quality threshold in a third time duration; the sum or difference of the signal quality measured based on the SSB in the first mode and the third quality offset is lower than or equal to the third quality threshold; or the signal quality measured based on the SSB in the first mode is lower than or equal to the third quality threshold in the third time duration.
[0218] In some embodiments, the terminal device 110 may transmit, to the network device 120, assistance information related to a condition of entering or leaving the first mode. In some embodiments, the assistance information may comprise at least one of the following: a preference on the first quality threshold; a preference on the second quality threshold; a preference on the third quality threshold; a preference on the first quality offset; a preference on the second quality offset; a preference on the third quality offset; a preference on the first time duration; a preference on the second time duration; a preference on the third time duration; or a request for the condition of entering or leaving the first mode.
[0219] With the method 800, a frequent switching between a LP-WUS monitoring and a PEI / paging monitoring may be avoided and power consumption of the terminal device may be saved.
[0220] FIG. 9 illustrates another example method 900 of communication implemented at a terminal device in accordance with some embodiments of the present disclosure. For example, the method 900 may be performed at the terminal device 110 as shown in FIG. 1A. For the purpose of discussion, in the following, the method 900 will be described with reference to FIG. 1A. It is to be understood that the method 900 may include additional blocks not shown and / or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
[0221] At block 910, the terminal device 110 may perform a LP-WUS monitoring in a first mode.
[0222] At block 920, the terminal device 110 may determine that a failure of a decoding of the LP-WUS or a false alarm issue happens for a predetermined number of times.
[0223] At block 930, the terminal device 110 may transit from the first mode to a second mode for monitoring a PEI or a paging message. In some embodiments, the terminal device 110 may transit from the first mode to the second mode by: exiting the first mode; and monitoring the PEI or the paging message in the second mode.
[0224] In some embodiments, the terminal device 110 may store information of the failure of the decoding of the LP-WUS or the false alarm issue in a variable of the terminal device 110. If the terminal device 110 enters a connected state, the terminal device 110 may report the information to the network device 120.
[0225] In some embodiments, the terminal device 110 may initiate a random access to the network device 120 for reporting information of the failure of the decoding of the LP-WUS or the false alarm issue.
[0226] With the method 900, the terminal device may fall back to a PEI / paging monitoring if a problem occurs in a LP-WUS reception. Thus, monitoring performance of the terminal device may be improved.
[0227] FIG. 10 illustrates another example method 1000 of communication implemented at a terminal device in accordance with some embodiments of the present disclosure. For example, the method 1000 may be performed at the terminal device 110 as shown in FIG. 1A. For the purpose of discussion, in the following, the method 1000 will be described with reference to FIGs. 1A and 1B. It is to be understood that the method 1000 may include additional blocks not shown and / or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
[0228] At block 1010, the terminal device 110 may determine whether a first transition from a first mode for monitoring a LP-WUS to a second mode for monitoring a PEI or a paging message or a second transition from the second mode to the first mode is performed.
[0229] With reference to FIG. 10, if the first transition is performed, the method 1000 proceeds to block 1020. At block 1020, the terminal device 110 may perform the monitoring of the LP-WUS during the first transition. In some embodiments, the terminal device 110 may perform the monitoring of the LP-WUS until the main radio 142 of the terminal device 110 is fully turn-on.
[0230] With reference to FIG. 10, if the second transition is performed, the method 1000 proceeds to block 1030. At block 1030, the terminal device 110 may perform the monitoring of the PEI or the paging message during the second transition. In some embodiments, the terminal device 110 may perform the monitoring of the PEI or the paging message until the LP-WUS receiver 141 of the terminal device 110 is fully turn-on.
[0231] In some embodiments, if the PEI or the paging message is received during the second transition, the terminal device 110 may stop the second transition. In some embodiments, if a false alarm issue happens for reception of the PEI or the paging message, the terminal device 110 may resume the second transition.
[0232] With the method 1000, a behavior of the terminal device during a transition between a LP-WUS monitoring and a PEI / paging may be specified, and monitoring performance of the terminal device may be improved.
[0233] It is to be understood that operations of the methods 800 to 1000 correspond to the process described in connection with FIGs. 2 to 7, and thus other details are omitted here for conciseness.
[0234] EXAMPLE IMPLEMENTATION OF DEVICES
[0235] FIG. 11 is a simplified block diagram of a device 1100 that is suitable for implementing embodiments of the present disclosure. The device 1100 can be considered as a further example implementation of the terminal device 110 or the network device 120 as shown in FIG. 1A. Accordingly, the device 1100 can be implemented at or as at least a part of the terminal device 110 or the network device 120.
[0236] As shown, the device 1100 includes a processor 1110, a memory 1120 coupled to the processor 1110, a suitable transceiver 1140 coupled to the processor 1110, and a communication interface coupled to the transceiver 1140. The memory 1110 stores at least a part of a program 1130. The transceiver 1140 may be for bidirectional communications or a unidirectional communication based on requirements. The transceiver 1140 may include at least one of a transmitter 1142 or a receiver 1144. The transmitter 1142 and the receiver 1144 may be functional modules or physical entities. The transceiver 1140 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements, such as X2 / Xn interface for bidirectional communications between eNBs / gNBs, S1 / NG interface for communication between a Mobility Management Entity (MME) / Access and Mobility Management Function (AMF) / SGW / UPF and the eNB / gNB, Un interface for communication between the eNB / gNB and a relay node (RN) , or Uu interface for communication between the eNB / gNB and a terminal device.
[0237] The program 1130 is assumed to include program instructions that, when executed by the associated processor 1110, enable the device 1100 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGs. 1A to 10. The embodiments herein may be implemented by computer software executable by the processor 1110 of the device 1100, or by hardware, or by a combination of software and hardware. The processor 1110 may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor 1110 and memory 1120 may form processing means 1150 adapted to implement various embodiments of the present disclosure.
[0238] The memory 1120 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 1120 is shown in the device 1100, there may be several physically distinct memory modules in the device 1100. The processor 1110 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 1100 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
[0239] In some embodiments, a terminal device comprises a circuitry configured to: determine number of transitions between a first mode for monitoring a LP-WUS and a second mode for monitoring a PEI or a paging message in a first period of time; in accordance with a determination that the number of transitions is greater than a number threshold, perform the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode; and in accordance with a determination that the number of transitions is smaller than the number threshold, perform the transition between the first mode and the second mode.
[0240] In some embodiments, a terminal device comprises a circuitry configured to: perform a LP-WUS monitoring in a first mode; and in accordance with a determination that a failure of a decoding of the LP-WUS or a false alarm issue happens for a predetermined number of times, transit from the first mode to a second mode for monitoring a PEI or a paging message.
[0241] In some embodiments, a terminal device comprises a circuitry configured to: in accordance with a determination that a first transition from a first mode for monitoring a LP-WUS to a second mode for monitoring a PEI or a paging message is performed, perform the monitoring of the LP-WUS during the first transition; and in accordance with a determination that a second transition from the second mode to the first mode is performed, perform the monitoring of the PEI or the paging message during the second transition.
[0242] The term ‘circuitry’ used herein may refer to hardware circuits and / or combinations of hardware circuits and software. For example, the circuitry may be a combination of analog and / or digital hardware circuits with software / firmware. As a further example, the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions. In a still further example, the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software / firmware for operation, but the software may not be present when it is not needed for operation. As used herein, the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and / or firmware.
[0243] Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0244] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to FIGs. 1A to 10. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
[0245] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
[0246] The above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0247] Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
[0248] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims
1.A terminal device, comprising:a processor configured to cause the terminal device to:determine number of transitions between a first mode for monitoring a low power wake up signal (LP-WUS) and a second mode for monitoring a paging early indication (PEI) or a paging message in a first period of time;in accordance with a determination that the number of transitions is greater than a number threshold, perform the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode; andin accordance with a determination that the number of transitions is smaller than the number threshold, perform the transition between the first mode and the second mode.2.The terminal device of claim 1, wherein the terminal device is caused to determine the number of transitions in the first period of time by:in accordance with a determination that the terminal device transits from the first mode to the second mode or transits from the second mode to the first mode, incrementing a value of a counter while starting or restarting a first timer corresponding to the first period of time; anddetermining the number of transitions based on the value of the counter.3.The terminal device of claim 2, wherein the terminal device is caused to perform the monitoring of the PEI or the paging message in the second mode without the transition between the first mode and the second mode by:stopping the first timer while starting a second timer; andperforming the monitoring of the PEI or the paging message without the transition during running of the second timer.4.The terminal device of claim 2, wherein the terminal device is caused to perform the transition between the first mode and the second mode by:in accordance with a determination that the first timer expires, resetting the value of the counter.5.The terminal device of claim 1, wherein the terminal device is caused to perform the transition between the first mode and the second mode by:transiting from the second mode to the first mode based on one of the following:a sum or difference of signal quality measured based on a synchronization signal block (SSB) in the second mode and a first quality offset is higher than or equal to a first quality threshold in a first time duration,the sum or difference of the signal quality measured based on the SSB in the second mode and the first quality offset is higher than or equal to the first quality threshold, orthe signal quality measured based on the SSB in the second mode is higher than or equal to the first quality threshold in the first time duration; andtransiting from the first mode to the second mode based on one of the following:a sum or difference of signal quality measured based on a low power synchronization signal (LP-SS) in the first mode and a second quality offset is lower than or equal to a second quality threshold in a second time duration,the sum or difference of the signal quality measured based on the LP-SS in the first mode and the second quality offset is lower than or equal to the second quality threshold,the signal quality measured based on the LP-SS in the first mode is lower than or equal to the second quality threshold in the second time duration,a sum or difference of signal quality measured based on the SSB in the first mode and a third quality offset is lower than or equal to a third quality threshold in a third time duration,the sum or difference of the signal quality measured based on the SSB in the first mode and the third quality offset is lower than or equal to the third quality threshold, orthe signal quality measured based on the SSB in the first mode is lower than or equal to the third quality threshold in the third time duration.6.The terminal device of claim 5, wherein the terminal device is further caused to:transmit, to a network device, assistance information related to a condition of entering or leaving the first mode, the assistance information comprising at least one of the following:a preference on the first quality threshold;a preference on the second quality threshold;a preference on the third quality threshold;a preference on the first quality offset;a preference on the second quality offset;a preference on the third quality offset;a preference on the first time duration;a preference on the second time duration;a preference on the third time duration; ora request for the condition of entering or leaving the first mode.7.A terminal device, comprising:a processor configured to cause the terminal device to:perform a low power wake up signal (LP-WUS) monitoring in a first mode; andin accordance with a determination that a failure of a decoding of the LP-WUS or a false alarm issue happens for a predetermined number of times, transit from the first mode to a second mode for monitoring a paging early indication (PEI) or a paging message.8.The terminal device of claim 7, wherein the terminal device is caused to transit from the first mode to the second mode by:exiting the first mode; andmonitoring the PEI or the paging message in the second mode.9.The terminal device of claim 7, wherein the terminal device is further caused to:store information of the failure of the decoding of the LP-WUS or the false alarm issue in a variable of the terminal device; andin accordance with a determination that the terminal device enters a connected state, report the information to a network device.10.The terminal device of claim 7, wherein the terminal device is further caused to:initiate a random access to a network device for reporting information of the failure of the decoding of the LP-WUS or the false alarm issue.11.A terminal device, comprising:a processor configured to cause the terminal device to:in accordance with a determination that a first transition from a first mode for monitoring a low power wake up signal (LP-WUS) to a second mode for monitoring a paging early indication (PEI) or a paging message is performed, perform the monitoring of the LP-WUS during the first transition; andin accordance with a determination that a second transition from the second mode to the first mode is performed, perform the monitoring of the PEI or the paging message during the second transition.12.The terminal device of claim 11, wherein the terminal device is caused to perform the monitoring of the LP-WUS by:performing the monitoring of the LP-WUS until a main radio of the terminal device is fully turn-on.13.The terminal device of claim 11, wherein the terminal device is caused to perform the monitoring of the PEI or the paging message by:performing the monitoring of the PEI or the paging message until a LP-WUS receiver of the terminal device is fully turn-on.14.The terminal device of claim 13, wherein the terminal device is further caused to:in accordance with a determination that the PEI or the paging message is received during the second transition, stop the second transition; orin accordance with a determination that a false alarm issue happens for reception of the PEI or the paging message, resume the second transition.15.A method of communication, comprising:determining, at a terminal device, number of transitions between a first mode for monitoring a low power wake up signal (LP-WUS) and a second mode for monitoring a paging early indication (PEI) or a paging message in a first period of time;in accordance with a determination that the number of transitions is greater than a number threshold, performing the monitoring of the PEI or the paging message in the second mode without a transition between the first mode and the second mode; andin accordance with a determination that the number of transitions is smaller than the number threshold, performing the transition between the first mode and the second mode.16.A method of communication, comprising:performing, at a terminal device, a low power wake up signal (LP-WUS) monitoring in a first mode; andin accordance with a determination that a failure of a decoding of the LP-WUS or a false alarm issue happens for a predetermined number of times, transiting from the first mode to a second mode for monitoring a paging early indication (PEI) or a paging message.17.A method of communication, comprising:in accordance with a determination that a first transition from a first mode for monitoring a low power wake up signal (LP-WUS) to a second mode for monitoring a paging early indication (PEI) or a paging message is performed, performing, at a terminal device, the monitoring of the LP-WUS during the first transition; andin accordance with a determination that a second transition from the second mode to the first mode is performed, performing the monitoring of the PEI or the paging message during the second transition.