Devices, methods, and medium for communication
The introduction of a low power wake-up receiver and threshold-based measurements in terminal devices addresses high power consumption in IoT and wearable devices by enabling ultra-deep sleep modes and accurate RRM measurements, thus reducing power usage.
Patent Information
- Application Number
- PCT/CN2024/099857
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-12-26
AI Technical Summary
Power consumption in IoT devices and wearable devices remains high due to periodic paging monitoring and measurement even in RRC idle/inactive states, necessitating further power savings.
Implementing a terminal device with a low power wake-up receiver (LP-WUR) to monitor a low power signal, perform LR serving cell measurements, and determine MR serving cell measurements based on thresholds, allowing RRM measurements to be offloaded to the LR, with options for relaxed or normal MR serving cell measurements.
Reduces power consumption by enabling ultra-deep sleep modes with low wake-up latency and accurate RRM measurements, enhancing power efficiency in communication devices.
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Figure CN2024099857_26122025_PF_FP_ABST
Abstract
Description
DEVICES, METHODS, AND MEDIUM FOR COMMUNICATIONFIELD
[0001] Example embodiments of the present disclosure generally relate to the field of communication techniques and in particular, to devices, methods, and a computer readable medium for communication.BACKGROUND
[0002] Several technologies have been proposed for power saving of a terminal device. For example, user equipment (UE) may enter to a radio resource control (RRC) idle / inactive state to reduce power consumption. However, it is still critical for power limited devices, e.g., the Internet of Things (IoT) devices, wearable devices, etc., since periodic paging monitoring and measurement consume considerable power at UE side even in RRC idle / inactive state. Therefore, it is beneficial for UE to further reduce the power consumption.
[0003] A study item for low power wake-up signal (LP-WUS) was discussed in new radio (NR) release 18 (Rel-18) of the 3rd Generation Partnership Project (3GPP) . This study item intends to study and evaluate techniques of low power signal and low power wake-up receiver, to enable extreme low power consumption and low wake-up latency, mainly in RRC idle / inactive state. A work item of LP-WUS continue being studied in release 19 (Rel-19) . An LP-WUS signal will be introduced into NR system, and is used to wake up the UE’s main radio (MR) which is staying in ultra-deep-sleep mode. Low power synchronization signal (LP-SS) can be utilized for synchronization, e.g., when the MR is staying in ultra-deep-sleep mode, and some details about the LP-SS are still to be studied.SUMMARY
[0004] In general, example embodiments of the present disclosure provide devices, methods, and a computer storage medium for communication.
[0005] In a first aspect, there is provided a terminal device. The terminal device comprises at least one processor configured to cause the terminal device at least to: in accordance with a determination that an entry condition is met, start monitoring a first low power signal; perform a low power wake-up receiver (LR) serving cell measurement based on a second low power signal; and perform a main radio (MR) serving cell measurement based on a measurement result of the LR serving cell measurement and at least one threshold, wherein the at least one threshold is determined based on a further threshold for neighbor cell measurement, and wherein the MR serving cell measurement comprises at least one of a relaxed MR serving cell measurement or a normal MR serving cell measurement.
[0006] In a second aspect, there is provided a terminal device. The terminal device comprises at least one processor configured to cause the terminal device at least to: perform a first MR serving cell measurement to obtain a result of the first MR serving cell measurement before starting monitoring a first low power signal, and determine to perform at least one of the following based on the result of the first MR serving cell measurement and at least one threshold: starting an LR serving cell measurement, starting a relaxed MR serving cell measurement, or starting a normal MR serving cell measurement.
[0007] In a third aspect, there is provided a method of communication. The method comprises: in accordance with a determination that an entry condition is met, starting, at a terminal device, monitoring a first low power signal; perform an LR serving cell measurement based on a second low power signal; and performing an MR serving cell measurement based on a measurement result of the LR serving cell measurement and at least one threshold, wherein the at least one threshold is determined based on a further threshold for neighbor cell measurement, and wherein the MR serving cell measurement comprises at least one of a relaxed MR serving cell measurement or a normal MR serving cell measurement.
[0008] In a fourth aspect, there is provided a method of communication. The method comprises: performing, at a terminal device, a first MR serving cell measurement to obtain a result of the first MR serving cell measurement before starting monitoring a first low power signal, and determining to perform at least one of the following based on the result of the first MR serving cell measurement and at least one threshold: starting an LR serving cell measurement, starting a relaxed MR serving cell measurement, or starting a normal MR serving cell measurement.
[0009] In a fifth aspect, there is provided a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to the third or the fourth aspect above.
[0010] It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Through the more detailed description of some example 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:
[0012] FIG. 1 illustrates an example communication network in which some embodiments of the present disclosure can be implemented;
[0013] FIG. 2A illustrates a schematic diagram of resources occupied by an LP signal which can be used in some example embodiments of the present disclosure;
[0014] FIGS. 2B-2C illustrate schematic diagrams of on-off keying (OOK) symbols which can be used in some example embodiments of the present disclosure;
[0015] FIGS. 2D-2E illustrate schematic diagrams of OOK-1 and OOK-4 respectively which can be used in some example embodiments of the present disclosure;
[0016] FIG. 3 illustrates a signalling chart illustrating communication process in accordance with some embodiments of the present disclosure;
[0017] FIGS. 4A-4E illustrate some example processes for a terminal device in accordance with some embodiments of the present disclosure;
[0018] FIG. 5 illustrates a signalling chart illustrating communication process in accordance with some embodiments of the present disclosure;
[0019] FIG. 6 illustrates an example process for a terminal device in accordance with some embodiments of the present disclosure;
[0020] FIG. 7 illustrates a flowchart of an example method implemented at a terminal device in accordance with some embodiments of the present disclosure;
[0021] FIG. 8 illustrates a flowchart of an example method implemented at a terminal device in accordance with some embodiments of the present disclosure; and
[0022] FIG. 9 illustrates a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
[0023] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0024] Principle of the present disclosure will now be described with reference to some example 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 limitation as to the scope of the disclosure. Embodiments described herein can be implemented in various manners other than the ones described below.
[0025] 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.
[0026] References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0027] It shall be understood that although the terms “first” and “second” etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. 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. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0029] 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.
[0030] As used herein, the term “communication network” refers to a network following any suitable communication standards or technologies, such as New Radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Code Divided Multiple Address (CDMA) , Frequency Divided Multiple Address (FDMA) , Time Divided Multiple Address (TDMA) , Frequency Divided Duplexer (FDD) , Time Divided Duplexer (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Divided Multiple Access (OFDMA) , cdma2000, Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Global System for Mobile Communications (GSM) , Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, 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) , 5.5G, 5G-Advanced networks, beyond 5G (B5G) , the sixth generation (6G) communication protocols, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols either currently known or to be developed in the future. The techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.
[0031] As used herein, the term “terminal device” refers to any device having wireless or wired communication capabilities. Examples of 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 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 be incorporated 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 satellite, an unmanned aerial systems (UAS) platform, 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] 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 (MN) and the other one may be a secondary node (SN) . 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 and 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.
[0034] 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.
[0035] The terminal device or the network device may work on several frequency ranges, e.g. frequency range 1 (FR1) (410 MHz –7125 MHz) , frequency range 2 (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 device 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.
[0036] 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, or channel emulator.
[0037] 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 1G, 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, 5G, 5.5G, 5G-Advanced networks, or 6G networks.
[0038] 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.
[0039] 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 “based at least in part 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.
[0040] 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.
[0041] A low power wake-up signal (LP-WUS) was proposed in NR Rel-18. A study item for LP-WUS has studied and evaluated techniques of low power signal and low power wake-up receiver (LP-WUR) , to enable extreme low power consumption and low wake-up latency, mainly in RRC idle or inactive state. A new work item of LP-WUS is ongoing in Rel-19. An LP-WUS will be introduced into the NR system which is used to wake up a UE whose MR is staying in ultra-deep-sleep mode. Power consumption of UE MR can be saved because it can stay in ultra-deep-sleep mode in a relatively long time.
[0042] LP-SS may be used for synchronization and radio resource management (RRM) measurement of an LP-WUR in LP-WUS monitoring mode. In order to further reduce the power consumption, RRM measurement performed by MR can be offloaded to LR by measuring the LP-SS, therefore the MR is not required to wake up frequently for RRM measurement. However, details of RRM measurement for MR are still unclear.
[0043] Embodiments of the present disclosure provide a solution of communication. In the solution, a terminal device may start LP-WUS monitoring and perform LR serving cell measurement based on determining that an entry condition is met, and the terminal device may further determine to perform an MR serving cell measurement based on a measurement result of the LR serving cell measurement and at least one threshold which is determined based on a further threshold for neighbor cell measurement. As such, the RRM measurement can be offloaded to the LR when the entry condition for LP-WUS monitoring is met, and in addition the MR serving cell measurement can be started so as to obtain a more accurate measurement result. The MR serving cell measurement may be a relaxed or a normal MR serving cell measurement, and the result thereof can be used for determining cell reselection. Principles and implementations of the present disclosure will be described in detail below with reference to the figures.
[0044] FIG. 1 illustrates an example communication network 100 in which some embodiments of the present disclosure can be implemented. The communication network 100 may also be called as a network environment, a network system, a communication system, a communication environment, or the like, the present disclosure does not limit this aspect. The communication network 100 includes a network device 110 and a terminal device 120 which may communicate with each other. The communication network 100 may also include a core network (CN) which may involve a variety of network functions or entities.
[0045] In the communication network 100, the network device 110 and the terminal device 120 can communicate data and control information to each other, and the communications in the communication network may be implemented according to any proper communication protocol (s) .
[0046] Embodiments of the present disclosure can be applied to any suitable scenarios. For example, embodiments of the present disclosure can be implemented at reduced capability NR devices. Alternatively, embodiments of the present disclosure can be implemented in one of the followings: NR multiple-input and multiple-output (MIMO) , NR sidelink enhancements, NR systems with frequency above 52.6GHz, an extending NR operation up to 71GHz, narrow band-Internet of Thing (NB-IOT) / enhanced Machine Type Communication (eMTC) over non-terrestrial networks (NTN) , NTN, UE power saving enhancements, NR coverage enhancement, NB-IoT and LTE-MTC, Integrated Access and Backhaul (IAB) , NR Multicast and Broadcast Services, or enhancements on Multi-Radio Dual-Connectivity.
[0047] It is to be understood that the numbers of devices and their connection relationships and types shown in FIG. 1 are only for the purpose of illustration without suggesting any limitation. For example, there may be multiple terminal devices connecting to the network device 110, for example the network 100 may include any suitable numbers of devices adapted for implementing embodiments of the present disclosure.
[0048] In some example embodiments, the terminal device 120 may be equipped with an LP-WUR and an MR, where the LP-WUR is used to receive the LP signal, and where the MR is used to transmit / receive other channel or signal other than the LP signal. For ease of description, the channel or signal transmitted / received by the MR may be referred to as an MR signal, including but not limited to receiving physical downlink control channel (PDCCH) , physical downlink shared channel (PDSCH) , synchronization signal block (SSB) , or transmitting physical uplink control channel (PUCCH) , physical uplink shared channel (PUSCH) , sounding reference signal (SRS) , etc.
[0049] In some embodiments, the terminal device 120 may be in a main mode to receive the MR signal. In some embodiments, the terminal device 120 may be in a low power mode to receive the LP signal. In some embodiments, the terminal device 120 may receive the MR signal and the LP signal at a same time, e.g., both the MR and the LP-MUR are activated / enabled.
[0050] In some embodiments, the terminal device 120 may be in a main mode. The terminal device 120 may receive / transmit normal DL / UL transmission (e.g., PDSCH, PDCCH, PUSCH, PUCCH, etc. ) in the main mode with a main radio or a main receiver. In the context of the present disclose, the terms “main radio” , “main receiver” can be used interchangeably. In the present disclosure, the term “MR” may refer to the main radio and / or the main receiver.
[0051] In some embodiments, the terminal device 120 may be in a low power mode. The terminal device 120 may receive the LP signal in the low power mode with a low power wake-up radio or a low power wake-up receiver. In the context of the present disclose, the terms “low power mode” , “deep sleeping mode” , “ultra-deep sleep mode” , “ultra-deep sleeping mode” , “ultra-low power mode” can be used interchangeably, and the terms “low power radio” , “ultra-low power radio” , “low power receiver” , “ultra-low power receiver” , “wake-up receiver” , “low power wake-up receiver” , “low power wake-up radio” can be used interchangeably. In the present disclosure, the term “LP-WUR” or “LR” may refer to the low power wake-up receiver and / or the low power wake-up radio.
[0052] In the present disclosure, the term “low power mode” may refer to a mode that the terminal device 120 is not required to perform at least one of the following: paging monitoring, cell selection and re-selection, measurement based on an SSB or channel state information -reference signal (CSI-RS) , PDCCH monitoring, UL transmission, etc., and the terminal device 120 is required to perform LP signal monitoring and / or detection.
[0053] In the present disclosure, the term “LP-WUR” may refer to a radio used in the low power mode for transmission / reception. In an embodiment, the LP-WUR may be independent to the MR, and it is not used for transmission / reception of the legacy DL / UL transmissions. In another embodiment, the LP-WUR may share at least a part of the components (e.g. some components) of the MR. The LP-WUR is low-cost and low power consuming, e.g., it may have lower power consumption than the MR.
[0054] In some embodiments, the terminal device 120 may perform, by using the MR, at least one of the following: paging monitoring, cell selection and re-selection, measurement based on SSB or CSI-RS, PDCCH monitoring, or UL transmission.
[0055] In some embodiments, the LP-WUR may be turned off or on. For a UE in RRC idle / inactive state, it may turn off its MR or switch the MR into an ultra-deep sleep mode. The UE utilizes the LP-WUR to monitor the LP-WUS signal, and determines whether to wake-up the MR based on the detection of LP-WUS.
[0056] In the present disclosure, the terminal device 120 may be equipped with an LR with OFDM receiver (i.e., the LR is capable of receiving OFDM signal, e.g., an OFDM sequence) , which may be called as an OFDM-LR, or an OOK-LR for LR with OOK receiver. In some examples, the OFDM-LR can receive the bits carried by OOK symbols and overlaid sequences.
[0057] As mentioned above, the LP-WUR is used to receive LP signal. In the present disclosure, there may be two types of LP signals: a low power synchronization signal (LP-SS) and a low power wake-up signal (LP-WUS) .
[0058] The LP-SS may also be called as a low power reference signal (LP-RS) , which is used for synchronization, measurement (e.g., RRM measurement) , and / or beam measurement. The LP-SS may be cell specific, or cell group specific (e.g., multiple cells associated with a same tracking area code (TAC) , may have a same configuration for LP-SS) . In some examples, the terminal device 120 may expect that the LP-SS will always be transmitted in each LP-SS occasion.
[0059] The LP-WUS is used for informing the terminal device of wake-up information, e.g., to inform the terminal device to wake-up from the LP mode (to switch to MR mode) , or inform the terminal device to stay in the LP mode, or to inform the terminal device of a configuration for LP signal. For example, the LP-WUS may be used for indicating to the terminal device 120 to wake up from the LP mode, e.g., start to monitor a paging occasion (PO) for paging downlink control information (DCI) .
[0060] In some examples, the LP-WUS may include a preamble part and a payload part, where the preamble part is used for synchronization or measurement and the payload part contains the wake-up information.
[0061] In some embodiments, the LP signal (such as LP-WUS) may be based on at least one amplitude modulation sequence, where the sequence may include a symbol with higher amplitude and a symbol with lower amplitude. In some examples, the amplitude modulation may include any of: amplitude shift keying (ASK) , frequency shift keying (FSK) , or on-off keying (OOK) modulation. Specifically, the OOK modulation is widely considered due to its very simple receiver architecture and ultra-low power consumption. With OOK modulation, the receiver may detect envelop or energy of the time domain signal with a relatively low sampling rate, and without complicated baseband processing. As an example, the OOK modulation is considered in the following disclosure as one of the amplitude modulation. An OOK modulation sequence may include at least one OOK ON symbol and at least one OOK OFF symbol. In some examples, the terms “OOK symbol” , “OOK ON symbol” and “OOK OFF symbol” can be replaced by “OOK chip” or “OOK pulse” , “OOK ON chip” or “OOK ON pulse” , and “OOK OFF chip” or “OOK OFF pulse” , respectively. For example, the ON symbol and the OFF symbol may represent symbols or pulses with higher and lower amplitude respectively.
[0062] For FSK, there may be multiple frequency components (e.g., two frequency components) , and the information may be conveyed by selecting a subset of the frequency components to transmit signal. For example, the information which is transmitted in a first component may represent information bit “0” , and the information which is transmitted in a second component may represent information bit “1” .
[0063] For ease of description, the following description will be discussed with reference to OOK modulation, however it is to be understood that ASK or FSK is still applicable and the present disclosure does not limit for this aspect. For example, an OOK ON symbol is equivalent to a non-zero power which is transmitted in a frequency component of FSK modulation, an OOK OFF symbol is equivalent to a symbol with zero power in a frequency component of FSK modulation.
[0064] In some embodiments, the LP signal may occupy a set of time / frequency resources for a serving cell. FIG. 2A illustrates a schematic diagram of resources 210 occupied by an LP signal which can be used in some example embodiments of the present disclosure. In frequency domain, the resources allocated to the LP signal 212 may be overlapped with a set of PRBs or subcarriers, i.e., the terminal device 120 may be indicated with a set of PRBs or subcarriers, and the frequency resources of the set of PRBs or subcarriers are used by the LP signal 212. In time domain, the resources allocated to the LP signal 212 may be overlapped with a set of OFDM symbols, i.e., the terminal device 120 may be indicated with a set of OFDM symbols, and the time resources of the set of OFDM symbols are used by the LP signal 212.
[0065] In some examples, OOK modulation is proposed for the LP signal, such as LP-WUS or LP-SS. An OOK signal may be generated based on the OFDM signal generation, e.g., an OFDM with zero power can be an OOK-OFF symbol (i.e., a logical value “0” ) , and an OFDM symbol with non-zero power can be an OOK-ON symbol (i.e., a logical value “1” ) . In other words, the OOK ON symbol has relatively high power, and the OOK OFF symbol has zero power or relatively low power.
[0066] It is to be understood that an OOK symbol may be equal to or may be not equal to an OFDM symbol. FIG. 2B illustrates a schematic diagram of OOK symbols 220 which can be used in some example embodiments of the present disclosure. As shown in FIG. 2B, an OOK ON symbol or an OOK OFF symbol may have a duration which equals to the duration of an OFDM symbol. In this case, an OOK ON symbol and an OOK OFF symbol are realized by a non-zero power OFDM symbol and a zero power OFDM symbol respectively. FIG. 2C illustrates a schematic diagram of OOK symbols 230 which can be used in some example embodiments of the present disclosure. As shown in FIG. 2C, each of an OOK ON symbol or an OOK OFF symbol may have a duration which is shorter than an OFDM symbol. In this case, the OOK ON symbol and OOK OFF symbol can be realized by DFT-s-OFDM, or by independent time domain generation.
[0067] In some instances, several options for OOK signal generation based on OFDM waveform were proposed. FIGS. 2D-2E illustrate schematic diagrams of OOK-1 240 and OOK-4 250 respectively which can be used in some example embodiments of the present disclosure. For example, a number of SCs used by LP-WUS including potential guard-bands may be represented as N.
[0068] Option OOK-1: Single-bit in 1 OFDM symbol, SCs of LP-WUS are:
[0069] ● OOK=1 means all SCs are modulated;
[0070] ● OOK=0 means all SCs are zero power (from base-band point of view) .
[0071] Option OOK-4: Transform M-bit OOK in time domain
[0072] ● N SCs of OOK-1 are generated by a transformation (DFT / Least square)
[0073] - N’ samples are generated from M-bits;
[0074] - signal modification may or may NOT be used;
[0075] - truncation or other additional modification may or may NOT be used, if not used, N is the same as N’ ;
[0076] ● N’ can be the same as K.
[0077] In some instances, OOK-1 may be used for LP-SS. In some instances, OOK-4 may be used for LP-SS, for example, M is one of a set of or a subset of {1, 2, 4, 8, 16} and M may depend on SCS. For instance, the SCS of a CP-OFDM symbol used for LP-SS generation is the same as that used for LP-WUS generation.
[0078] It is to be noted that, in the present disclosure, if not specified otherwise, the term “OFDM symbol” indicates CP-OFDM symbol, or any variant of OFDM symbol, e.g., DFT-s-OFDM, GI-OFDM, zero CP OFDM, unique word OFDM, etc.
[0079] In some cases, the OFDM sequence used for generating an OOK symbol (i.e., OOK-ON symbol) can also convey information bit. For example, there may be Ns OFDM sequences which can convey maximum log2 (Ns) information bits, and the UE may try to detect which sequence is used by gNB and then determine the information bits conveyed by the sequence.
[0080] At least the metrics LP-RSRP and LP-RSRQ can be supported for RRM serving cell measurement performed by OOK-based receiver based on LP-SS. LP-RSRP is the linear average of received power of LP-SS in OOK ON symbols. LP-RSRQ can be determined by LP-RSRQ=LP-RSRP / LP-RSSI. For the definition of LP-RSSI for determination of LP-RSRQ, some following options can be further considered: option 1, LP-RSSI is the linear average of total received power in all LP-SS OOK symbols; option 2, LP-RSSI is the linear average of total received power in LP-SS OOK OFF symbols; option 3, LP-RSSI is the linear average of total received power in LP-SS OOK ON symbols.
[0081] In the current specification, the UE shall measure the SS-RSRP and SS-RSRQ level of the serving cell and evaluate the cell selection criterion S for the serving cell at least once every M1*N1 DRX cycle, where M1=2 if SMTC periodicity (TSMTC) >20 ms and DRX cycle ≤0.64 second; otherwise M1=1. The UE shall filter the SS-RSRP and SS-RSRQ measurements of the serving cell using at least 2 measurements. Within the set of measurements used for the filtering, at least two measurements shall be spaced by, at least DRX cycle / 2.
[0082] If the UE has evaluated according to Table 1 below in Nserv consecutive DRX cycles that the serving cell does not fulfil the cell selection criterion S, the UE shall initiate the measurements of all neighbour cells indicated by the serving cell, regardless of the measurement rules currently limiting UE measurement activities. If the UE in RRC_IDLE has not found any new suitable cell based on searches and measurements using the intra-frequency, inter-frequency and inter-RAT information indicated in the system information for 10 s, the UE shall initiate cell selection procedures for the selected PLMN.
[0083] Table 1: Nserv
[0084] Cell selection is performed by one of the following two procedures: a) Initial cell selection (no prior knowledge of which RF channels are NR frequencies) , b) Cell selection by leveraging stored information.
[0085] The cell selection criterion S is fulfilled when Srxlev > 0 and Squal > 0, where: Srxlev = Qrxlevmeas – (Qrxlevmin + Qrxlevminoffset) –Pcompensation -Qoffsettemp, and Squal = Qqualmeas – (Qqualmin + Qqualminoffset) -Qoffsettemp.
[0086] Some definitions are provided in Table 2 below.
[0087] Table 2
[0088] Generally, if the cell selection RX level value (Srxlev) and the cell selection quality value (Squal) of serving cell is below the thresholds, intra-frequency and / or inter-frequency measurement should be performed.
[0089] The UE may perform relaxed intra-frequency, inter-frequency or inter-RAT RRM measurement if UE is with low mobility, or not at cell edge.
[0090] The relaxed measurement criterion for UE with low mobility is fulfilled when: (SrxlevRef –Srxlev) < SSearchDeltaP, where:
[0091] - Srxlev = current Srxlev value of the serving cell (dB) ,
[0092] - SrxlevRef = reference Srxlev value of the serving cell (dB) , set as follows:
[0093] - After selecting or reselecting a new cell, or
[0094] - If (Srxlev -SrxlevRef) > 0, or
[0095] - If the relaxed measurement criterion has not been met for TSearchDeltaP: the UE shall set the value of SrxlevRef to the current Srxlev value of the serving cell.
[0096] The relaxed measurement criterion for UE not at cell edge is fulfilled when: Srxlev >SSearchThresholdP and Squal > SSearchThresholdQ, if SSearchThresholdQ is configured, where:
[0097] - Srxlev = current Srxlev value of the serving cell (dB) ,
[0098] - Squal = current Squal value of the serving cell (dB) .
[0099] It is proposed that the UE should start LR measurement on serving cell after it has entered LP-WUS monitoring, however, details on MR measurement on serving cell should be studied.
[0100] In the present disclosure, the term “LR serving cell measurement” is used and refers to RRM measurement (s) of a serving cell by LR, for example, the RRM measurement (s) on LP-SS or on LP-WUS may be performed. In the present disclosure, the term “MR serving cell measurement” is used and may include a relaxed MR serving cell measurement and / or a normal MR serving cell measurement, for example, the RRM measurement (s) on PSS / SSS may be performed. The normal MR serving cell measurement may refer to RRM measurement (s) of a serving cell by MR with a normal periodicity, e.g., at least once evert M1*N1 DXR cycle. The relaxed MR serving cell measurement may refer to RRM measurement (s) of a serving cell by MR with a relaxed periodicity, e.g., multiple times of the normal periodicity.
[0101] In the present disclosure, the term “MR neighbor cell measurement” may include a normal MR neighbor cell measurement and / or a relaxed MR neighbor cell measurement, for example, the RRM measurement (s) on PSS / SSS may be performed. The normal MR neighbor cell measurement may refer to RRM measurement (s) of a neighbor cell by MR with a normal periodicity. The relaxed MR neighbor cell measurement may refer to RRM measurement (s) of a neighbor cell by MR with a relaxed periodicity which may be multiple times of the normal periodicity.
[0102] Reference is now made to FIG. 3, which illustrates a signalling chart illustrating communication process 300 in accordance with some example embodiments of the present disclosure. The process 300 may involve a network device 110 and a terminal device 120 as shown in FIG. 1. It would be appreciated that the process 300 may be applied to other communication scenarios, which will not be described in detail.
[0103] In the process 300, the network device 110 may transmit 310 a low power signal configuration 312 to the terminal device 120, and accordingly the terminal device 120 may receive 314 the low power signal configuration 312. In some embodiments, the low power signal configuration 312 may indicate resources of low power signals. In some examples, the terminal device 120 may determine the resources of low power signals.
[0104] In the process 300, the terminal device 120 starts 320 monitoring a first low power signal if an entry condition is met. In some implementations, the first low power signal may be LP-WUS, and the entry condition may be regarded as an entry condition for LP-WUS monitoring. For example, if the entry condition is met, the LR of the terminal device 120 may be switched on and the LP-WUS monitoring may be started.
[0105] In the process 300, the terminal device 120 starts 330 LR serving cell measurement. In some implementations, the terminal device 120 performs the LR serving cell measurement based on a second low power signal. In some implementations, the second low power signal may be LP-WUS and / or LP-SS. For example, the network device 110 may transmit the second low power signal 332. For example, the LR of the terminal device 120 may measure the second low power signal 332 to determine a measurement result of the LR serving cell measurement.
[0106] In some implementations, if the entry condition is met, the terminal device 120 may start monitoring the LP-WUS (i.e., starting LP-WUS monitoring) , and meanwhile start the LR serving cell measurement. For example, the terminal device 120 may simultaneously start both the LP-WUS monitoring and the LR serving cell measurement.
[0107] In some implementations, if the entry condition is met, the terminal device 120 may start monitoring the LP-WUS, and the terminal device 120 further starts the LR serving cell measurement after the terminal device 120 has started monitoring LP-WUS. For example, the terminal device 120 may start monitoring the LP-WUS first, and then start the LR serving cell measurement.
[0108] In some embodiments, the entry condition may include that the terminal device 120 has received an indication from the network device 110, and the indication indicates to the terminal device 120 to start monitoring LP-WUS and / or start LR serving cell measurement.
[0109] In some embodiments, the entry condition may include that a measurement result performed by MR is not lower than or is larger than a specific threshold. For example, the measurement result performed by MR may be a normal MR serving cell measurement. For example, if the measurement result performed by MR is above (or not below) the specific threshold, then it can be determined that the entry condition is met. For example, the terminal device 120 may enter into the LP mode and start monitoring LP-WUS.
[0110] In some implementations, the terminal device 120 may perform the LR serving cell measurement by measuring LP-WUS and / or LP-SS. In some implementations, the terminal device 120 may determine a measurement result of the LR serving cell measurement by measuring LP-WUS and / or LP-SS. In some embodiments, the terminal device 120 may measure a sequence of LP-SS or a preamble of LP-WUS.
[0111] In some examples, at least one OOK symbol of the sequence of LP-SS or of the preamble of LP-WUS may be measured. For example, the LR of the terminal device 120 may measure OOK symbols of the sequence of LP-SS or of the preamble of LP-WUS, to derive the measurement result of the LR serving cell measurement. For instance, the LR of the terminal device 120 may be an OOK based LR.
[0112] In some examples, at least one overlaid sequence of an OOK-ON symbol of the sequence of LP-SS or of the preamble of LP-WUS may be measured. For example, the LR of the terminal device 120 may measure at least one overlaid sequence of an OOK-ON symbol of the sequence of LP-SS or of the preamble of LP-WUS, to derive the measurement result of the LR serving cell measurement. For instance, the LR of the terminal device 120 may be an OFDM based LR.
[0113] In some examples, a PSS / SSS of an SSB may be measured. For example, the LR of the terminal device 120 may measure a PSS / SSS of an SSB to derive the measurement result of the LR serving cell measurement. For instance, the LR of the terminal device 120 may have an OFDM capability.
[0114] In some implementations, the measurement result of the LR serving cell measurement may be determined based on filtering of at least two LR serving cell measurements. In some examples, the at least two LR serving cell measurements are spaced at least a half of a DRX cycle, i.e., at least DRX cycle / 2. In some examples, the terminal device 120 may filter at least a first measurement result of a first LR serving cell measurement and a second measurement result of a second LR serving cell measurement. For example, the first LR serving cell measurement and the second LR serving cell measurement are spaced at least a half of a DRX cycle.
[0115] In some embodiments, the measurement result of the LR serving cell measurement may be determined based on at least one of: a measured cell received level value of the second low power signal (represented as LP_Qrxlevmeas) , a minimum required received level in a cell (represented as Qrxlevmin) , an offset to the minimum required received level (represented as Qrxlevminoffset) , a compensation value (represented as Pcompensation) , a measured cell quality value of the second low power signal (represented as LP_Qqualmeas) , a minimum required quality level in a cell (represented as Qqualmin) , an offset to the minimum required quality level (represented as Qqualminoffset) , or at least one offset value (such as offset0, offset1, and / or Qoffsettemp) .
[0116] In the process 300, the terminal device 120 performs 340 an MR serving cell measurement. In some implementations, the MR serving cell measurement may be a relaxed MR serving cell measurement and / or a normal MR serving cell measurement. For example, the network device 110 may transmit SSB signals 342, and the MR of the terminal device 120 may measure the SSB 342 to determine a measurement result of the MR serving cell measurement.
[0117] In the present disclosure, a normal MR serving cell measurement may refer to that the terminal device 120 measures SS-RSRP and SS-RSRQ level of the serving cell at least once every M1*N1 DRX cycle, while the relaxed MR serving cell measurement has a longer periodicity for measuring (i.e., a longer measurement periodicity) .
[0118] In some implementations, the terminal device 120 may determine whether to perform a relaxed MR serving cell measurement or a normal MR serving cell measurement, e.g., based on the measurement result of the LR serving cell measurement and at least one threshold. In some implementations, the at least one threshold may be determined based on a further threshold for neighbor cell measurement. As will be discussed below, the at least one threshold may include one or more than one of the following: a first threshold (Th1) , a second threshold (Th2) , a third threshold (Th3) , a fourth threshold (Th4) , a fifth threshold (Th5) .
[0119] In some implementations, each of the least one threshold is determined based on a further threshold for an intra-frequency neighbor cell measurement or for an inter-frequency neighbor cell measurement. For example, the further threshold for intra-frequency neighbor cell measurement may be SIntraSearchP or SIntraSearchQ. For example, the further threshold for inter-frequency neighbor cell measurement may be SnonIntraSearchP or SnonIntraSearchQ. For example, each of the least one threshold may equal to a sum of the further threshold and an offset value, where the offset value may be predefined or may be preconfigured by the network device 110. For example, the offset value may be zero, may be a negative value, or may be a positive value. For example, the offset value may be one of: 0, 1 dB, 2 dB, 3 dB, 4 dB, 5 dB, 6 dB, etc. For instance, the offset value may be taken as or be seen as a margin for the terminal device 120 before it starts neighbor cell measurement.
[0120] In some implementations, the at least one threshold may be determined based on a capability of the terminal device 120 (UE capability) , or be determined based on an implementation of the terminal device 120 (UE implementation) , or may be configured by the network device 110. For example, the terminal device 120 may determine the at least one threshold based on a difference between the measurement result of the LR serving cell measurement and a measurement result of MR measurement. For example, the terminal device 120 may determine the at least one threshold based on a measurement error (or an accuracy) of the LR serving cell measurement.
[0121] In some example embodiments, the at least one threshold may include a first threshold, which may be represented as Th1. In some examples, the at least one threshold may further include a second threshold, which may be represented as Th2.
[0122] In some examples, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold, the MR serving cell measurement may be not performed. For example, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold (Th1) , the terminal device 120 is not required to (or the terminal device 120 does not) perform the MR serving cell measurement, e.g. does not perform either relaxed MR serving cell measurement or normal MR serving cell measurement. In some instances, since LR serving cell measurement is performed after the terminal device 120 starts LP-WUS monitoring, it is not necessary to start the relaxed MR serving cell measurement even the terminal device 120 is not at cell edge or with low mobility, in this case, the power consumption can be reduced.
[0123] In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, the terminal device 120 may determine to perform the relaxed MR serving cell measurement, for example, the relaxed MR serving cell measurement may be started. In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, the terminal device 120 may start the relaxed MR serving cell measurement. In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, and if the criterion of “not at cell edge” or “with low mobility” discussed above is fulfilled, then the terminal device 120 may start the relaxed MR serving cell measurement. In some examples, when (or after) the relaxed MR serving cell measurement is started, the terminal device 120 may stop the LR serving cell measurement. In some instances, if the signal quality gets worse, then the LR serving cell measurement may become less reliable, in this case, the MR serving cell measurement can be started so as to obtain an accurate measurement result, and in addition the terminal device 120 may prepare neighbor cell measurement and cell reselection.
[0124] In some examples, if a measurement result of the relaxed MR serving cell measurement is lower than or not larger than the second threshold, the terminal device 120 may determine to perform a normal MR serving cell measurement, for example, the normal MR serving cell measurement may be started.
[0125] In some instances, the measurement result of the LR serving cell measurement may be represented as MLR, and the measurement result of the relaxed MR serving cell measurement may be represented as MMR.
[0126] FIG. 4A illustrates an example process 410 of the terminal device 120. Whether the entry condition is met may be determined at 411. If the entry condition is met at 411, the terminal device 120 may start LP-WUS monitoring and LR serving cell measurement at 412.
[0127] At 413, if MLR>Th1 (or MLR≥Th1) , the terminal device 120 may not perform MR serving cell measurement. If MLR≤Th1 (or MLR<Th1) , the terminal device 120 performs a relaxed MR serving cell measurement at 414. In addition, if MMR<Th2 (or MMR≤Th2) , the terminal device 120 performs a normal MR serving cell measurement at 415.
[0128] In some examples, the measurement result of the relaxed MR serving cell measurement, MMR, may refer to one of the following or a combination of the following: Srxlev, Squal, Qrxlevmeas, or Qqualmeas, details of which may refer to those discussed above, e.g., with reference to Table 2. For example, Srxlev = Qrxlevmeas - (Qrxlevmin + Qrxlevminoffset) -Pcompensation -Qoffsettemp. For example, Squal = Qqualmeas - (Qqualmin + Qqualminoffset) -Qoffsettemp.
[0129] In some examples, the measurement result of the LR serving cell measurement, MLR, may refer to one of the following or a combination of the following: LP_Srxlev, LP_Squal, LP_Qrxlevmeas, or LP_Qqualmeas, which may be determined in a similar way as Srxlev, Squal, Qrxlevmeas, or Qqualmeas, respectively. For example, LP_Srxlev = (LP_Qrxlevmeas -offset0) - (Qrxlevmin + Qrxlevminoffset) -Pcompensation -Qoffsettemp, or LP_Srxlev = (LP_Qrxlevmeas + offset0) - (Qrxlevmin + Qrxlevminoffset) -Pcompensation -Qoffsettemp. For example, LP_Squal = (LP_Qqualmeas -offset1) - (Qqualmin + Qqualminoffset) -Qoffsettemp, or LP_Squal = (LP_Qqualmeas + offset1) - (Qqualmin + Qqualminoffset) -Qoffsettemp.
[0130] In some instances, LP_Qrxlevmeas and LP_Qqualmeas are the measured result of LP-RSRP and LP-RSRQ by LR, respectively. In some instances, offset0 and offset1 are two offset values, which may be determined based on a capability of the terminal device 120, determined based on an implementation of the terminal device 120 (UE implementation) , or may be configured by the network device 110. For instance, offset0 and / or offset1 can be zero, that is, the offset0 or offset1 can be omitted in the above equation for determining the MLR.
[0131] In some examples, the at least one threshold, the first threshold (Th1) and / or the second threshold (Th2) may be determined based on the further threshold for intra-frequency neighbor cell measurement (e.g., SIntraSearchP or SIntraSearchQ) or inter-frequency neighbor cell measurement (e.g., SnonIntraSearchP or SnonIntraSearchQ) . For example, Th1 = SIntraSearchP + offsetP_1, Th2 = SIntraSearchP + offsetP_2. For example, Th1 = SIntraSearchQ + offsetQ_1, Th2 = SIntraSearchQ + offsetQ_2. For example, Th1 = SnonIntraSearchP + offsetP_1, Th2 = SnonIntraSearchP + offsetP_2. For example, Th1 = SnonIntraSearchQ + offsetQ_1, Th2 = SnonIntraSearchQ + offsetQ_2. For example, Th1 = min (SIntraSearchP, SnonIntraSearchP) + offsetP_1, Th2 = min (SIntraSearchP, SnonIntraSearchP) + offsetP_2. For example, Th1= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_1, Th2= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_2. For example, Th1 = max (SIntraSearchP, SnonIntraSearchP) + offsetP_1, Th2 = max (SIntraSearchP, SnonIntraSearchP) + offsetP_2. For example, Th1= max (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_1, Th2= max (SIntraSearchQ, SnonIntraSearchQ) +offsetQ_2.
[0132] In some examples, MMR is Srxlev or Squal, and if Srxlev < SIntraSearchP + offsetP_2 and Squal < SIntraSearchQ + offsetQ_2, then the terminal device 120 may perform normal MR serving cell measurement at 415.
[0133] In some examples, each of offsetP_1, offsetP_2, offsetQ_1, or offsetQ_2 may be 1dB, 2dB, 3dB, 4dB, 5dB or 6dB etc. In some examples, one of more than one of offsetP_1, offsetP_2, offsetQ_1, or offsetQ_2 may be zero, that is, one of more than one of offsetP_1, offsetP_2, offsetQ_1, or offsetQ_2 can be omitted in the above equations for determining Th1 or Th2.
[0134] The offset value, such as offsetP_1, offsetP_2, offsetQ_1, or offsetQ_2, can be seen as a margin for the terminal device 120 before it starts neighbor cell measurement. For instance, if offsetP_1 = 3 dB, this means the terminal device 120 should wake up its MR and start relaxed MR serving cell measurement when the signal quality gets worse but still 3dB higher than the threshold for the terminal device 120 to start neighbor cell measurement, therefore the terminal device 120 can get ready for the potential upcoming cell reselection in advance.
[0135] In some example embodiments, the at least one threshold may include a first threshold, which may be represented as Th1. In some examples, the at least one threshold may further include a fourth threshold, which may be represented as Th4.
[0136] In some examples, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold, the MR serving cell measurement may be not performed. For example, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold (Th1) , the terminal device 120 is not required to (or the terminal device 120 does not) perform the MR serving cell measurement, e.g. does not perform either relaxed MR serving cell measurement or normal MR serving cell measurement.
[0137] In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, the terminal device 120 may determine to perform the relaxed MR serving cell measurement, for example, the relaxed MR serving cell measurement may be started. In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, the terminal device 120 may start the relaxed MR serving cell measurement. In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, and if the criterion of “not at cell edge” or “with low mobility” discussed above is fulfilled, then the terminal device 120 may start the relaxed MR serving cell measurement. In some examples, when (or after) the relaxed MR serving cell measurement is started, the terminal device 120 may stop the LR serving cell measurement.
[0138] In some examples, the terminal device 120 may determine a further measurement result based on the measurement result of the LR serving cell measurement and a measurement result of the relaxed MR serving cell measurement. In some examples, if the further measurement result is lower than or not larger than the fourth threshold, the terminal device 120 may determine to perform a normal MR serving cell measurement, for example, the normal MR serving cell measurement may be started.
[0139] In some instances, the measurement result of the LR serving cell measurement may be represented as MLR, the measurement result of the relaxed MR serving cell measurement may be represented as MMR, and the further measurement result may be represented as MMR_LR. It is to be noted that details of MLR and MMR may refer to those described above.
[0140] FIG. 4B illustrates an example process 420 of the terminal device 120. Whether the entry condition is met may be determined at 411. If the entry condition is met at 411, the terminal device 120 may start LP-WUS monitoring and LR serving cell measurement at 412.
[0141] At 413, if MLR>Th1 (or MLR≥Th1) , the terminal device 120 may not perform MR serving cell measurement. If MLR≤Th1 (or MLR<Th1) , the terminal device 120 performs a relaxed MR serving cell measurement at 414. In addition, if MMR_LR <Th4 (or MMR_LR≤Th4) , the terminal device 120 performs a normal MR serving cell measurement at 425.
[0142] In some examples, the further measurement result may be a combined result of the relaxed MR serving cell measurement and LR serving cell measurement.
[0143] In some examples, the further measurement result, MMR_LR, may be a sum or a weighted sum of the measurement result of the LR serving cell measurement (MLR) and the measurement result of the relaxed MR serving cell measurement (MMR) . For example, MMR_LR= MLR+ MMR. For example, MMR_LR= a*MLR+ b*MMR, with a+b=1. In some cases, if a=b, then MMR_LR is an arithmetic average of MLR and MMR.
[0144] In some examples, multiple measurements may be performed to obtain multiple results. In some examples, the further measurement result, MMR_LR, may be an arithmetic average or a weighted average of at least one MLR and at least one MMR.
[0145] In some examples, a plurality of measurement results of the LR serving cell measurement may be determined, for example, the terminal device 120 may perform a plurality of times of LR serving cell measurements to obtain a plurality of MLR. In some examples, a plurality of measurement results of the relaxed MR serving cell measurement may be determined, for example, the terminal device 120 may perform a plurality of times of relaxed MR serving cell measurements to obtain a plurality of MMR. In some examples, the further measurement result, MMR_LR, may be determined based on filtering of the plurality of MLR and the plurality of MMR. In some examples, any two MMR should be spaced at least a half of DRX cycle. In some examples, any two MLR should be spaced at least a half of DRX cycle. In some examples, one MMR and one MLR should be spaced at least a half of DRX cycle.
[0146] In some examples, the at least one threshold, the first threshold (Th1) and / or the fourth threshold (Th4) may be determined based on the further threshold for intra-frequency neighbor cell measurement (e.g., SIntraSearchP or SIntraSearchQ) or inter-frequency neighbor cell measurement (e.g., SnonIntraSearchP or SnonIntraSearchQ) . For example, details of Th1 may refer to those discussed above.
[0147] In some examples, the fourth threshold, Th4, may be determined by Th4 = SIntraSearchP + offsetP_4 or Th4= SIntraSearchQ + offsetQ_4. In some examples, MMR_LR is LPMR_Srxlev or LPMR_Squal, LPMR_Srxlev is determined based on LP_Srxlev and Srxlev, and LPMR_Squal is determined based on LP_Squal and Squal. In some examples, if LPMR_Srxlev < SIntraSearchP + offsetP_4 and LPMR_Squal < SIntraSearchQ + offsetQ_4, then the terminal device 120 may perform normal MR serving cell measurement at 425.
[0148] In some examples, the fourth threshold, Th4, may be determined by Th4 =SnonIntraSearchP + offsetP_4 or Th4= SnonIntraSearchQ + offsetQ_4. In some examples, the fourth threshold, Th4, may be determined by, e.g., Th4 = min (SIntraSearchP, SnonIntraSearchP) + offsetP_4 or Th4= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_4. In some examples, the fourth threshold, Th4, may be determined by, e.g., Th4 = max (SIntraSearchP, SnonIntraSearchP) + offsetP_4 or Th4=max(SIntraSearchQ, SnonIntraSearchQ) + offsetQ_4.
[0149] Similarly, each of offsetP_4 or offsetQ_4 may be 1dB, 2dB, 3dB, 4dB, 5dB or 6dB etc. In some examples, offsetP_4 and / or offsetQ_4 may be zero, that is, offsetP_4 and / or offsetQ_4 can be omitted in the above equations for determining Th4. Similarly, the offset value, such as offsetP_4 or offsetQ_4, can be seen as a margin for the terminal device 120 before it starts neighbor cell measurement.
[0150] In some example embodiments, the at least one threshold may include a first threshold, which may be represented as Th1. In some examples, the at least one threshold may further include a third threshold, which may be represented as Th3.
[0151] In some examples, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold, the MR serving cell measurement may be not performed. For example, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold (Th1) , the terminal device 120 is not required to (or the terminal device 120 does not) perform the MR serving cell measurement, e.g. does not perform either relaxed MR serving cell measurement or normal MR serving cell measurement.
[0152] In some examples, if the measurement result of the LR serving cell measurement is within a range from the third threshold to the first threshold, the terminal device 120 may determine to perform the relaxed MR serving cell measurement, for example, the relaxed MR serving cell measurement may be started. In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold and also the measurement result of the LR serving cell measurement is larger than or is not lower than the third threshold, the terminal device 120 may start the relaxed MR serving cell measurement. In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold and also the measurement result of the LR serving cell measurement is larger than or is not lower than the third threshold, and if the criterion of “not at cell edge” or “with low mobility” discussed above is fulfilled, then the terminal device 120 may start the relaxed MR serving cell measurement.
[0153] In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the third threshold, the terminal device 120 may determine to perform the normal MR serving cell measurement, for example, the normal MR serving cell measurement may be started.
[0154] In some instances, the measurement result of the LR serving cell measurement may be represented as MLR, and it is to be noted that details of MLR may refer to those described above.
[0155] FIG. 4C illustrates an example process 430 of the terminal device 120. Whether the entry condition is met may be determined at 411. If the entry condition is met at 411, the terminal device 120 may start LP-WUS monitoring and LR serving cell measurement at 412.
[0156] At 413, if MLR>Th1 (or MLR≥Th1) , the terminal device 120 may not perform MR serving cell measurement. If Th3≤MLR≤Th1 (or Th3≤MLR<Th1 or Th3<MLR≤Th1 or Th3<MLR<Th1) , the terminal device 120 performs a relaxed MR serving cell measurement at 434. If MLR <Th3 (or MLR≤Th3) , the terminal device 120 performs a normal MR serving cell measurement at 435.
[0157] In some examples, the at least one threshold, the first threshold (Th1) and / or the third threshold (Th3) may be determined based on the further threshold for intra-frequency neighbor cell measurement (e.g., SIntraSearchP or SIntraSearchQ) or inter-frequency neighbor cell measurement (e.g., SnonIntraSearchP or SnonIntraSearchQ) . For example, details of Th1 may refer to those discussed above.
[0158] In some examples, the third threshold, Th3, may be determined by Th3 = SIntraSearchP + offsetP_3 or Th3= SIntraSearchQ + offsetQ_3. In some examples, MLR is LP_Srxlev or LP_Squal. In some examples, if LP_Srxlev < SIntraSearchP + offsetP_3 and LP_Squal <SIntraSearchQ + offsetQ_3, then the terminal device 120 may perform normal MR serving cell measurement at 435.
[0159] In some examples, the third threshold, Th3, may be determined by Th3 =SnonIntraSearchP + offsetP_3 or Th3= SnonIntraSearchQ + offsetQ_3. In some examples, the third threshold, Th3, may be determined by, e.g., Th3 = min (SIntraSearchP, SnonIntraSearchP) + offsetP_3 or Th3= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_3. In some examples, the third threshold, Th3, may be determined by, e.g., Th3 = max (SIntraSearchP, SnonIntraSearchP) + offsetP_3 or Th3=max(SIntraSearchQ, SnonIntraSearchQ) + offsetQ_3.
[0160] Similarly, each of offsetP_3 or offsetQ_3 may be 1dB, 2dB, 3dB, 4dB, 5dB or 6dB etc. In some examples, offsetP_3 and / or offsetQ_3 may be zero, that is, offsetP_3 and / or offsetQ_3 can be omitted in the above equations for determining Th3. Similarly, the offset value, such as offsetP_3 or offsetQ_3, can be seen as a margin for the terminal device 120 before it starts neighbor cell measurement.
[0161] In some example embodiments, the at least one threshold may include a first threshold, which may be represented as Th1. In some examples, the at least one threshold may further include a fifth threshold, which may be represented as Th5.
[0162] In some examples, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold, the MR serving cell measurement may be not performed. For example, if the measurement result of the LR serving cell measurement is not lower than or is larger than the first threshold (Th1) , the terminal device 120 is not required to (or the terminal device 120 does not) perform the MR serving cell measurement, e.g. does not perform either relaxed MR serving cell measurement or normal MR serving cell measurement.
[0163] In some examples, if the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, the terminal device 120 may determine to perform the normal MR serving cell measurement, for example, the normal MR serving cell measurement may be started. In some examples, when (or after) the normal MR serving cell measurement is started, the terminal device 120 may stop the LR serving cell measurement.
[0164] In some examples, if a measurement result of the normal MR serving cell measurement is larger than or not lower than the fifth threshold, the terminal device 120 may determine to perform the relaxed MR serving cell measurement, for example, the relaxed MR serving cell measurement may be started.
[0165] In some instances, the measurement result of the LR serving cell measurement may be represented as MLR, and the measurement result of the normal MR serving cell measurement may be represented as MMR.
[0166] FIG. 4D illustrates an example process 440 of the terminal device 120. Whether the entry condition is met may be determined at 411. If the entry condition is met at 411, the terminal device 120 may start LP-WUS monitoring and LR serving cell measurement at 412.
[0167] At 413, if MLR>Th1 (or MLR≥Th1) , the terminal device 120 may not perform MR serving cell measurement. If MLR≤Th1 (or MLR<Th1) , the terminal device 120 performs a normal MR serving cell measurement at 444. In addition, if MMR>Th5 (or MMR≥Th5) , the terminal device 120 performs a relaxed MR serving cell measurement at 445.
[0168] In some examples, the at least one threshold, the first threshold (Th1) and / or the fifth threshold (Th5) may be determined based on the further threshold for intra-frequency neighbor cell measurement (e.g., SIntraSearchP or SIntraSearchQ) or inter-frequency neighbor cell measurement (e.g., SnonIntraSearchP or SnonIntraSearchQ) . For example, details of Th1 may refer to those discussed above.
[0169] In some examples, the fifth threshold, Th5, may be determined by Th5 = SIntraSearchP + offsetP_5 or Th5= SIntraSearchQ + offsetQ_5. In some examples, MMR is Srxlev or Squal. In some examples, if Srxlev > SIntraSearchP + offsetP_5 and Squal > SIntraSearchQ + offsetQ_5, then the terminal device 120 may perform relaxed MR serving cell measurement at 455.
[0170] In some examples, the fifth threshold, Th5, may be determined by Th5 =SnonIntraSearchP + offsetP_5 or Th5= SnonIntraSearchQ + offsetQ_5. In some examples, the fifth threshold, Th5, may be determined by, e.g., Th5 = min (SIntraSearchP, SnonIntraSearchP) + offsetP_5 or Th5= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_5. In some examples, the fifth threshold, Th5, may be determined by, e.g., Th5 = max (SIntraSearchP, SnonIntraSearchP) + offsetP_5 or Th5=max(SIntraSearchQ, SnonIntraSearchQ) + offsetQ_5.
[0171] Similarly, each of offsetP_5 or offsetQ_5 may be 1dB, 2dB, 3dB, 4dB, 5dB or 6dB etc. In some examples, offsetP_5 and / or offsetQ_5 may be zero, that is, offsetP_5 and / or offsetQ_5 can be omitted in the above equations for determining Th5. Similarly, the offset value, such as offsetP_5 or offsetQ_5, can be seen as a margin for the terminal device 120 before it starts neighbor cell measurement.
[0172] In some example embodiments, the terminal device 120 may perform the relaxed MR serving cell measurement while performing the LR serving cell measurement. In some examples, if the entry condition for LP-WUS monitoring is met, the terminal device 120 may start monitoring LP-WUS, and meanwhile (or after the LP-WUS monitoring is started) the terminal device 120 may start the LR serving cell measurement, and in addition the terminal device 120 may directly start the relaxed MR serving cell measurement.
[0173] In some examples, the terminal device 120 may determine to perform (and start performing) normal MR serving cell measurement based on one or more of the following: the measurement result of the LR serving cell measurement, the measurement result of the relaxed MR serving cell measurement, or at least one threshold.
[0174] FIG. 4E illustrates an example process 450 of the terminal device 120. Whether the entry condition is met may be determined at 411. If the entry condition is met at 411, the terminal device 120 may start LP-WUS monitoring, LR serving cell measurement, and relaxed MR serving cell measurement at 452. If a specific condition is met, the terminal device 120 performs a normal MR serving cell measurement at 453.
[0175] In some examples, if the specific condition is met, the terminal device 120 may start performing normal MR serving cell measurement, in some examples, the LR serving cell measurement and the relaxed MR serving cell measurement may be stopped.
[0176] In some examples, the specific condition may be any one of those described above, for example, that for performing operation 415 in FIG. 4A, that for performing operation 425 in FIG. 4B, or that for performing operation 435 in FIG. 4C, details of which will not be repeated herein.
[0177] According to embodiments with reference to FIGS. 3-4E, after the terminal device 120 starts LP-WUS monitoring (e.g. after the LR is switched on) , the RRM measurement can be offloaded to the LR (e.g., the LR serving cell measurement is started) to reduce the overall power consumption. In the present disclosure, the terminal device 120 may determine to perform relaxed MR serving cell measurement or normal MR serving cell measurement, e.g., since the LR serving cell measurement may be not accurate enough for the terminal device 120 to perform some operations such as cell reselection. In some embodiments, the terminal device 120 may perform the relaxed or normal MR serving cell measurement when necessary. In this way, the cell reselection can be performed in a precise way when the LR is involved in the RRM measurement.
[0178] Reference is further made to FIG. 5, which illustrates a signalling chart illustrating communication process 500 in accordance with some example embodiments of the present disclosure. The process 500 may involve a network device 110 and a terminal device 120 as shown in FIG. 1. It would be appreciated that the process 500 may be applied to other communication scenarios, which will not be described in detail.
[0179] In the process 500, the network device 110 may transmit 510 a low power signal configuration 512 to the terminal device 120, and accordingly the terminal device 120 may receive 514 the low power signal configuration 512. In some embodiments, the low power signal configuration 512 may indicate resources of low power signals. In some examples, the terminal device 120 may determine the resources of low power signals.
[0180] In the process 500, the terminal device 120 performs 520 a first MR serving cell measurement. In some implementations, the first MR serving cell measurement may be a normal MR serving cell measurement when the MR is on, for example, the MR is active. In some examples, the network device 110 may transmit SSB signals 522, and accordingly the terminal device 120 may measure the SSB to determine a result of the first MR serving cell measurement. For example, the result of the first MR serving cell measurement may be represented as MMR.
[0181] In the process 500, the terminal device 120 starts 530 monitoring a first low power signal if an entry condition is met. In some implementations, the first low power signal may be LP-WUS, and the entry condition may be regarded as an entry condition for LP-WUS monitoring. For example, if the entry condition is met, the LR of the terminal device 120 may be switched on and the LP-WUS monitoring may be started.
[0182] In the process 500, the terminal device 120 may further perform 540 at least one of the following based on the result of the first MR serving cell measurement (MMR) and at least one threshold: starting an LR serving cell measurement, starting a relaxed MR serving cell measurement, or starting a normal MR serving cell measurement.
[0183] In some implementations, the result of the first MR serving cell measurement (MMR) may be compared with the at least one threshold, and in addition the further operation at 540 may be determined based on the comparison result.
[0184] In some implementations, the at least one threshold may include a sixth threshold (Th6) , a seventh threshold (Th7) , and / or an eighth threshold (Th8) . In some examples, the eighth threshold is lower than the seventh threshold and is larger than the sixth threshold, i.e. Th6<Th8<Th7.
[0185] In some examples, the entry condition may include that the result of the first MR serving cell measurement is larger than the sixth threshold, i.e. MMR>Th6. In some examples, if MMR>Th6, the terminal device 120 may determine to start LP-WUS monitoring.
[0186] In some examples, if the result of the first MR serving cell measurement is larger than or is not smaller than the seventh threshold, the terminal device 120 may start LR serving cell measurement, but not perform relaxed / normal MR serving cell measurement.
[0187] In some examples, if the result of the first MR serving cell measurement is within a range from the eighth threshold to the seventh threshold, the terminal device 120 may start relaxed MR serving cell measurement, optionally, the LR serving cell measurement is also started.
[0188] In some examples, if the result of the first MR serving cell measurement is within a range from the sixth threshold to the eighth threshold, the terminal device 120 may start normal MR serving cell measurement, optionally, the LR serving cell measurement is also started.
[0189] FIG. 6 illustrates an example process 600 of the terminal device 120. The first MR serving cell measurement is performed at 610, e.g., a result of the first MR serving cell measurement (MMR) is determined.
[0190] If MMR>Th7 (or MMR≥Th7) , the terminal device 120 starts LP-WUS monitoring and performs LR serving cell measurement at 622, and the terminal device 120 may not perform MR serving cell measurement.
[0191] If Th8≤MMR≤Th7 (or Th8≤MMR <Th7 or Th8< MMR≤Th7 or Th8< MMR <Th7) , the terminal device 120 starts LP-WUS monitoring, performs LR serving cell measurement, and performs a relaxed MR serving cell measurement at 624. That is, the terminal device 120 may perform both the LR serving cell measurement and the relaxed MR serving cell measurement at 624.
[0192] If Th6≤MMR≤Th8 (or Th6≤MMR <Th8 or Th6< MMR≤Th8 or Th6< MMR <Th8) , the terminal device 120 starts LP-WUS monitoring, performs LR serving cell measurement, and performs a normal MR serving cell measurement at 626. That is, the terminal device 120 may perform both the LR serving cell measurement and the normal MR serving cell measurement at 626.
[0193] In some examples, the at least one threshold, the sixth threshold (Th6) , the seventh threshold (Th7) , and / or the eighth threshold (Th8) may be determined in a similar way as that for determining at least one threshold in the process 300. In some examples, the at least one threshold, the sixth threshold (Th6) , the seventh threshold (Th7) , and / or the eighth threshold (Th8) may be determined based on the further threshold for intra-frequency neighbor cell measurement (e.g., SIntraSearchP or SIntraSearchQ) or inter-frequency neighbor cell measurement (e.g., SnonIntraSearchP or SnonIntraSearchQ) .
[0194] In some examples, the sixth threshold, Th6, may be determined by Th6 = SIntraSearchP + offsetP_6 or Th6= SIntraSearchQ + offsetQ_6. In some examples, the seventh threshold, Th7, may be determined by Th7 = SIntraSearchP + offsetP_7 or Th7= SIntraSearchQ + offsetQ_7. In some examples, the eighth threshold, Th8, may be determined by Th8 = SIntraSearchP + offsetP_8 or Th8= SIntraSearchQ + offsetQ_8.
[0195] In some examples, the sixth threshold, Th6, may be determined by Th6 =SnonIntraSearchP + offsetP_6 or Th6= SnonIntraSearchQ + offsetQ_6. In some examples, the seventh threshold, Th7, may be determined by Th7 = SnonIntraSearchP + offsetP_7 or Th7= SnonIntraSearchQ + offsetQ_7. In some examples, the eighth threshold, Th8, may be determined by Th8 =SnonIntraSearchP + offsetP_8 or Th8= SnonIntraSearchQ + offsetQ_8.
[0196] In some examples, Th6 = min (SIntraSearchP, SnonIntraSearchP) + offsetP_6, Th7 =min(SIntraSearchP, SnonIntraSearchP) + offsetP_7, Th8 = min (SIntraSearchP, SnonIntraSearchP) + offsetP_8. In some examples, Th6= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_6, Th7= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_7, Th8= min (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_8.
[0197] In some examples, Th6 = max (SIntraSearchP, SnonIntraSearchP) + offsetP_6, Th7 =max(SIntraSearchP, SnonIntraSearchP) + offsetP_7, Th8 = max (SIntraSearchP, SnonIntraSearchP) + offsetP_8. In some examples, Th6= max (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_6, Th6= max (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_7, Th8= max (SIntraSearchQ, SnonIntraSearchQ) + offsetQ_8.
[0198] Similarly, each of offsetP_6, offsetP_7, offsetP_8, offsetQ_6, offsetQ_7, or offsetQ_8 may be 0, 1dB, 2dB, 3dB, 4dB, 5dB or 6dB etc. Similarly, the offset value, such as offsetP_6, offsetP_7, offsetP_8, offsetQ_6, offsetQ_7, or offsetQ_8, can be seen as a margin for the terminal device 120 before it starts neighbor cell measurement.
[0199] According to embodiments with reference to FIGS. 5-6, a result of the first MR serving cell measurement is used to determine whether to start LP-WUS monitoring. It is beneficial that the RRM measurement behavior (i.e., one of the above three behaviors 622, 624, 626) can also be determined based on the same measurement result, because the terminal device 120 can start a proper measurement behavior immediately after it enters LP-WUS monitoring, without waiting for other measurement result, e.g., a measurement result of LR serving cell measurement. Therefore, the processing efficiency can be improved.
[0200] It is to be appreciated that some examples about Th1 to Th8, offsetP_1 to offsetP_8, offsetQ_1 to offsetQ_8 are provided above for illustrative without any limitation, some other examples are still applied and the present disclosure does not limit for this aspect.
[0201] FIG. 7 illustrates a flowchart of an example method 700 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the terminal device which may perform the method 700 can be the terminal device 120 discussed above.
[0202] At block 710, in accordance with a determination that an entry condition is met, the terminal device starts monitoring a first low power signal. At block 720, the terminal device performs LR serving cell measurement based on a second low power signal. At block 730, the terminal device performs MR serving cell measurement based on a measurement result of the LR serving cell measurement and at least one threshold, where the at least one threshold is determined based on a further threshold for neighbor cell measurement, and where the MR serving cell measurement comprises at least one of a relaxed MR serving cell measurement or a normal MR serving cell measurement.
[0203] It should be noted that the method 700 may include various other operations which may be performed by the terminal device 120 as described above with reference to FIGS. 3-4E.
[0204] FIG. 8 illustrates a flowchart of an example method 800 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the terminal device which may perform the method 800 can be the terminal device 120 mentioned above.
[0205] At block 810, the terminal device performs a first MR serving cell measurement to obtain a result of the first MR serving cell measurement before starting monitoring a first low power signal. At block 820, the terminal device determines to perform at least one of the following based on the result of the first MR serving cell measurement and at least one threshold: starting an LR serving cell measurement, starting a relaxed MR serving cell measurement, or starting a normal MR serving cell measurement.
[0206] It should be noted that the method 800 may include various other operations which may be performed by the terminal device 120 as described above with reference to FIGS. 5-6.
[0207] Details of some embodiments according to the present disclosure have been described with reference to FIGS. 1-8. Now an example implementation of the terminal device and the network device will be discussed below.
[0208] In some example embodiments, a terminal device comprises circuitry configured to: in accordance with a determination that an entry condition is met, start monitoring a first low power signal; perform an LR serving cell measurement based on a second low power signal; and perform an MR serving cell measurement based on a measurement result of the LR serving cell measurement and at least one threshold, wherein the at least one threshold is determined based on a further threshold for neighbor cell measurement, and wherein the MR serving cell measurement comprises at least one of a relaxed MR serving cell measurement or a normal MR serving cell measurement. It should be noted that the terminal device comprises circuitry configured to perform various other operations as described above with reference to FIGS. 3-4E.
[0209] In some example embodiments, a terminal device comprises circuitry configured to: perform a first MR serving cell measurement to obtain a result of the first MR serving cell measurement before starting monitoring a first low power signal, and determine to perform at least one of the following based on the result of the first MR serving cell measurement and at least one threshold: starting an LR serving cell measurement, starting a relaxed MR serving cell measurement, or starting a normal MR serving cell measurement. It should be noted that the terminal device comprises circuitry configured to perform various other operations as described above with reference to FIGS. 5-6.
[0210] FIG. 9 illustrates a simplified block diagram of a device 900 that is suitable for implementing embodiments of the present disclosure. The device 900 can be considered as a further example implementation of the terminal device and the network device as described above. Accordingly, the device 900 can be implemented at or as at least a part of the terminal device or the network device.
[0211] As shown, the device 900 includes a processor 910, a memory 920 coupled to the processor 910, a suitable transceiver 940 coupled to the processor 910, and a communication interface coupled to the transceiver 940. The memory 920 stores at least a part of a program 930. The transceiver 940 may be for bidirectional communications or a unidirectional communication based on requirements. The transceiver 940 may include at least one of a transmitter and a receiver. The transmitter and the receiver may be functional modules or physical entities. The transceiver 940 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.
[0212] The program 930 is assumed to include program instructions that, when executed by the associated processor 910, enable the device 900 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 1-8. The embodiments herein may be implemented by computer software executable by the processor 910 of the device 900, or by hardware, or by a combination of software and hardware. The processor 910 may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor 910 and memory 920 may form processing means 950 adapted to implement various embodiments of the present disclosure.
[0213] The memory 920 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 920 is shown in the device 900, there may be several physically distinct memory modules in the device 900. The processor 910 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 900 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.
[0214] In summary, embodiments of the present disclosure may provide the following solutions.
[0215] The present disclosure provides a terminal device, comprising at least one processor configured to cause the terminal device at least to: in accordance with a determination that an entry condition is met, start monitoring a first low power signal; perform an LR serving cell measurement based on a second low power signal; and perform an MR serving cell measurement based on a measurement result of the LR serving cell measurement and at least one threshold, wherein the at least one threshold is determined based on a further threshold for neighbor cell measurement, and wherein the MR serving cell measurement comprises at least one of a relaxed MR serving cell measurement or a normal MR serving cell measurement.
[0216] In one embodiment, the terminal device as above, the at least one threshold comprises a first threshold, and the at least one processor is configured to cause the terminal device to: in accordance with a determination that the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, perform the relaxed MR serving cell measurement.
[0217] In one embodiment, the terminal device as above, the at least one processor is further configured to cause the terminal device to: in accordance with a determination that a measurement result of the relaxed MR serving cell measurement is lower than or not larger than a second threshold, perform the normal MR serving cell measurement.
[0218] In one embodiment, the terminal device as above, the at least one processor is further configured to cause the terminal device to: determine a further measurement result based on the measurement result of the LR serving cell measurement and a measurement result of the relaxed MR serving cell measurement; and in accordance with a determination that the further measurement result is lower than or not larger than a fourth threshold, perform the normal MR serving cell measurement.
[0219] In one embodiment, the terminal device as above, the at least one threshold comprises a first threshold and a third threshold, and the at least one processor is configured to cause the terminal device to: in accordance with a determination that the measurement result of the LR serving cell measurement is within a range from the third threshold to the first threshold, perform the relaxed MR serving cell measurement.
[0220] In one embodiment, the terminal device as above, the at least one processor is further configured to cause the terminal device to: in accordance with a determination that the measurement result of the LR serving cell measurement is lower than or not larger than the third threshold, perform the normal MR serving cell measurement.
[0221] In one embodiment, the terminal device as above, the at least one threshold comprises a first threshold and a fifth threshold, and the at least one processor is configured to cause the terminal device to: in accordance with a determination that the measurement result of the LR serving cell measurement is lower than or not larger than the first threshold, perform the normal MR serving cell measurement; and in accordance with a determination that a measurement result of the normal MR serving cell measurement is not lower than or is larger than the fifth threshold, perform the relaxed MR serving cell measurement.
[0222] In one embodiment, the terminal device as above, the at least one processor is configured to cause the terminal device to: perform the relaxed MR serving cell measurement while performing the LR serving cell measurement.
[0223] In one embodiment, the terminal device as above, the at least one processor is configured to cause the terminal device to: perform the normal MR serving cell measurement based on at least one of: the measurement result of the LR serving cell measurement, a measurement result of the relaxed MR serving cell measurement, or at least one threshold.
[0224] In one embodiment, the terminal device as above, the further measurement result is determined based on: a sum or a weighted sum of the measurement result of the LR serving cell measurement and the measurement result of the relaxed MR serving cell measurement, or filtering of a plurality of measurement results of the LR serving cell measurement and a plurality of measurement results of the relaxed MR serving cell measurement.
[0225] In one embodiment, the terminal device as above, each of the at least one the threshold is determined based on the further threshold for an intra-frequency neighbor cell measurement or for an inter-frequency neighbor cell measurement.
[0226] In one embodiment, the terminal device as above, each of the at least one the threshold is determined further based on an offset value.
[0227] In one embodiment, the terminal device as above, the offset value is determined based on a capability of the terminal device or is configured by a network device.
[0228] In one embodiment, the terminal device as above, the measurement result of the LR serving cell measurement is determined based on at least one of: a measured cell received level value of the second low power signal, a minimum required received level in a cell, an offset to the minimum required received level, a compensation value, a measured cell quality value of the second low power signal, a minimum required quality level in a cell, an offset to the minimum required quality level, or at least one offset value.
[0229] In one embodiment, the terminal device as above, the at least one processor is further configured to cause the terminal device to: determine the measurement result of the LR serving cell measurement based on filtering of at least a first measurement result of a first LR serving cell measurement and a second measurement result of a second LR serving cell measurement.
[0230] In one embodiment, the terminal device as above, the first LR serving cell measurement and the second LR serving cell measurement are spaced at least a half of a discontinuous reception (DRX) cycle.
[0231] In one embodiment, the terminal device as above, the at least one processor is further configured to cause the terminal device to: determine the measurement result of the LR serving cell measurement by at least one of: measuring a sequence of a low power synchronization signal (LP-SS) , measuring a preamble of a low power wake-up signal (LP-WUS) , measuring at least one on-off keying (OOK) symbol of the sequence of the LP-SS, measuring at least one OOK symbol of the preamble of the LP-WUS, measuring at least one overlaid sequence of an OOK-ON symbol of the sequence of the LP-SS, measuring at least one overlaid sequence of an OOK-ON symbol of the preamble of the LP-WUS, or measuring at least one synchronization signal block (SSB) .
[0232] In one embodiment, the terminal device as above, the entry condition comprises at least one of: an indication being received from the network device, wherein the indication indicates to the terminal device to start monitoring a low power signal or to start the LR serving cell measurement, or an MR measurement result being not lower than or larger than a specific threshold.
[0233] The present disclosure provides a terminal device, comprising at least one processor configured to cause the terminal device at least to: perform a first MR serving cell measurement to obtain a result of the first MR serving cell measurement before starting monitoring a first low power signal, and determine to perform at least one of the following based on the result of the first MR serving cell measurement and at least one threshold: starting an LR serving cell measurement, starting a relaxed MR serving cell measurement, or starting a normal MR serving cell measurement.
[0234] In one embodiment, the terminal device as above, the at least one threshold comprises a seventh threshold, and wherein the at least one processor is further configured to cause the terminal device to: in accordance with a determination that the result of the first MR serving cell measurement being larger than or not smaller than the seventh threshold, start monitoring a first low power signal and performing the LR serving cell measurement based on a second low power signal.
[0235] In one embodiment, the terminal device as above, the at least one threshold comprises at least one of: a sixth threshold, a seventh threshold, or an eighth threshold, wherein the eighth threshold is larger than the sixth threshold and is smaller than the seventh threshold, and the at least one processor is further configured to cause the terminal device to: in accordance with a determination that the result of the first MR serving cell measurement is within a range from the sixth threshold to the eighth threshold, perform the normal MR serving cell measurement, or in accordance with a determination that the result of the first MR serving cell measurement is within a range from the eighth threshold to the seventh threshold, perform the relaxed MR serving cell measurement.
[0236] In one embodiment, the terminal device as above, each of the at least one the threshold is determined based on the further threshold for an intra-frequency neighbor cell measurement or for an inter-frequency neighbor cell measurement.
[0237] In one embodiment, the terminal device as above, each of the at least one the threshold is determined further based on an offset value.
[0238] In one embodiment, the terminal device as above, the offset value is determined based on a capability of the terminal device or is configured by a network device.
[0239] The present disclosure provides a method of communication, comprising the operations implemented at the terminal device discussed above.
[0240] The present disclosure provides a terminal device, comprising: a processor; and a memory storing computer program codes; the memory and the computer program codes configured to, with the processor, cause the terminal device to perform the method implemented at the terminal device discussed above.
[0241] The present disclosure provides a non-transitory computer readable medium having instructions stored thereon, the instructions, when executed by a processor of an apparatus, causing the apparatus to perform the method implemented at a terminal device discussed above.
[0242] 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.
[0243] 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. 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.
[0244] 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.
[0245] 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.
[0246] 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.
[0247] 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 at least one processor configured to cause the terminal device to:in accordance with a determination that an entry condition is met, start monitoring a first low power signal;perform a low power wake-up receiver (LR) serving cell measurement based on a second low power signal; andperform a main radio (MR) serving cell measurement based on a measurement result of the LR serving cell measurement and at least one threshold, wherein the at least one threshold is determined based on a further threshold for neighbor cell measurement, and wherein the MR serving cell measurement comprises at least one of a relaxed MR serving cell measurement or a normal MR serving cell measurement.2.The terminal device of claim 1, wherein the at least one threshold comprises a first threshold, and wherein the at least one processor is configured to cause the terminal device to:in accordance with a determination that the measurement result of the LR serving cell measurement is lower than or is not larger than the first threshold, perform the relaxed MR serving cell measurement.3.The terminal device of claim 2, wherein the at least one processor is further configured to cause the terminal device to:in accordance with a determination that a measurement result of the relaxed MR serving cell measurement is lower than or not larger than a second threshold, perform the normal MR serving cell measurement.4.The terminal device of claim 2, wherein the at least one processor is further configured to cause the terminal device to:determine a further measurement result based on the measurement result of the LR serving cell measurement and a measurement result of the relaxed MR serving cell measurement; andin accordance with a determination that the further measurement result is lower than or not larger than a fourth threshold, perform the normal MR serving cell measurement.5.The terminal device of claim 1, wherein the at least one threshold comprises a first threshold and a third threshold, and wherein the at least one processor is configured to cause the terminal device to:in accordance with a determination that the measurement result of the LR serving cell measurement is within a range from the third threshold to the first threshold, perform the relaxed MR serving cell measurement.6.The terminal device of claim 5, wherein the at least one processor is further configured to cause the terminal device to:in accordance with a determination that the measurement result of the LR serving cell measurement is lower than or not larger than the third threshold, perform the normal MR serving cell measurement.7.The terminal device of claim 1, wherein the at least one threshold comprises a first threshold and a fifth threshold, and wherein the at least one processor is configured to cause the terminal device to:in accordance with a determination that the measurement result of the LR serving cell measurement is lower than or not larger than the first threshold, perform the normal MR serving cell measurement; andin accordance with a determination that a measurement result of the normal MR serving cell measurement is not lower than or is larger than the fifth threshold, perform the relaxed MR serving cell measurement.8.The terminal device of claim 1, wherein the at least one processor is configured to cause the terminal device to:perform the relaxed MR serving cell measurement while performing the LR serving cell measurement.9.The terminal device of claim 8, wherein the at least one processor is configured to cause the terminal device to:perform the normal MR serving cell measurement based on at least one of: the measurement result of the LR serving cell measurement, a measurement result of the relaxed MR serving cell measurement, or at least one threshold.10.The terminal device of claim 4, wherein the further measurement result is determined based on:a sum or a weighted sum of the measurement result of the LR serving cell measurement and the measurement result of the relaxed MR serving cell measurement, orfiltering of a plurality of measurement results of the LR serving cell measurement and a plurality of measurement results of the relaxed MR serving cell measurement.11.The terminal device of claim 1, wherein each of the at least one the threshold is determined based on the further threshold for an intra-frequency neighbor cell measurement or for an inter-frequency neighbor cell measurement.12.The terminal device of claim 11, wherein each of the at least one the threshold is determined further based on an offset value.13.The terminal device of claim 12, wherein the offset value is determined based on a capability of the terminal device or is configured by a network device.14.The terminal device of claim 1, wherein the measurement result of the LR serving cell measurement is determined based on at least one of:a measured cell received level value of the second low power signal,a minimum required received level in a cell,an offset to the minimum required received level,a compensation value,a measured cell quality value of the second low power signal,a minimum required quality level in a cell,an offset to the minimum required quality level, orat least one offset value.15.The terminal device of claim 1, wherein the at least one processor is further configured to cause the terminal device to:determine the measurement result of the LR serving cell measurement based on filtering of at least a first measurement result of a first LR serving cell measurement and a second measurement result of a second LR serving cell measurement.16.The terminal device of claim 15, wherein the first LR serving cell measurement and the second LR serving cell measurement are spaced at least a half of a discontinuous reception (DRX) cycle.17.The terminal device of claim 1, wherein the at least one processor is further configured to cause the terminal device to:determine the measurement result of the LR serving cell measurement by at least one of:measuring a sequence of a low power synchronization signal (LP-SS) ,measuring a preamble of a low power wake-up signal (LP-WUS) ,measuring at least one on-off keying (OOK) symbol of the sequence of the LP-SS,measuring at least one OOK symbol of the preamble of the LP-WUS,measuring at least one overlaid sequence of an OOK-ON symbol of the sequence of the LP-SS,measuring at least one overlaid sequence of an OOK-ON symbol of the preamble of the LP-WUS, ormeasuring at least one synchronization signal block (SSB) .18.The terminal device of claim 1, wherein the entry condition comprises at least one of:an indication being received from the network device, wherein the indication indicates to the terminal device to start monitoring a low power signal or to start the LR serving cell measurement, oran MR measurement result being not lower than or larger than a specific threshold.19.A terminal device comprising at least one processor configured to cause the terminal device to:perform a first main radio (MR) serving cell measurement to obtain a result of the first MR serving cell measurement before starting monitoring a first low power signal, anddetermine to perform at least one of the following based on the result of the first MR serving cell measurement and at least one threshold:starting a low power wake-up receiver (LR) serving cell measurement,starting a relaxed MR serving cell measurement, orstarting a normal MR serving cell measurement.20.The terminal device of claim 19, wherein each of the at least one the threshold is determined based on the further threshold for an intra-frequency neighbor cell measurement or for an inter-frequency neighbor cell measurement.
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