Positioning measurements
By determining time periods based on PDCCH search space gaps or DRX inactive times and performing positioning measurements under specific conditions, the challenges of positioning in NTN systems are addressed, improving measurement efficiency and communication reliability.
Patent Information
- Application Number
- PCT/CN2023/111535
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-08-07
- Publication Date
- 2025-02-13
AI Technical Summary
Current positioning measurement techniques for terminal devices in non-terrestrial networks (NTN) face challenges due to large signal propagation delays and the need for simultaneous communication and GNSS measurements, which can disrupt communication processes.
The solution involves determining a time period based on gaps between physical downlink control channel (PDCCH) search spaces or discontinuous reception (DRX) inactive times, and performing positioning measurements when specific conditions related to these time periods and a timer are met.
This approach enhances the flexibility and efficiency of positioning measurements, reducing their impact on communication processes and allowing for more reliable pre-compensation of uplink transmissions in NTN systems.
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Figure CN2023111535_13022025_PF_FP_ABST
Abstract
Description
POSITIONING MEASUREMENTSFIELD
[0001] Example embodiments of the present disclosure generally relate to the field of communication, and in particular, to a terminal device, a network device, methods, apparatuses and a computer readable storage medium for positioning measurements.BACKGROUND
[0002] With development of communication technology, more and more communication scenarios may relate to a non-terrestrial network (NTN) . A NTN refers to networks or segments of networks using NTN devices, such as satellites, unmanned aerial system (UAS) devices, etc., to provide a radio access network interface to a user equipment (UE) and backhaul connectivity to a core network including access to a data network. However, there are several technical challenges obstructing the use of NTN devices in wireless communication systems. For example, there may be significantly large signal transmission propagation delays (e.g., round-trip transmission delays, etc. ) between the NTN device and the UE due to the large geographic distance between the NTN device and the UE.
[0003] Currently, the UE needs to perform pre-compensation of uplink transmissions in terms of time and frequency adjustments. Such pre-compensation may be based on the UE being aware of the distance between the UE and the NTN device. The UE may perform positioning measurements to determine its position with reference to the NTN device. Enhancements for such measurements are still needed.SUMMARY
[0004] In general, example embodiments of the present disclosure provide a solution for enhancements for positioning measurements.
[0005] In a first aspect, there is provided a terminal device. The terminal device comprises at least one processor and at least one memory storing instructions. The instructions, when executed by the at least one processor, cause the terminal device at least to: determine a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; and based on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled, perform a positioning measurement in the time period.
[0006] In a second aspect, there is provided a network device. The network device comprises at least one processor; and at least one memory storing instructions. The instructions, when executed by the at least one processor, cause the network device at least to: determine configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; and transmit the configuration information to the terminal device.
[0007] In a third aspect, there is provided a method. The method comprises: determining a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; and based on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled, performing a positioning measurement in the time period.
[0008] In a fourth aspect, there is provided a method. The method comprises: determining configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; and transmitting the configuration information to the terminal device.
[0009] In a fifth aspect, there is provided an apparatus. The apparatus comprises means for determining a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; and means for based on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled, performing a positioning measurement in the time period.
[0010] In a sixth aspect, there is provided an apparatus. The apparatus comprises means for determining configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; and means for transmitting the configuration information to the terminal device.
[0011] In a seventh aspect, there is provided a terminal device. The terminal device comprises determining circuitry configured to determine a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; and performing circuitry configured to perform a positioning measurement in the time period based on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled.
[0012] In an eighth aspect, there is provided a network device. The network device comprises determining circuitry configured to determine configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; and transmitting circuitry configured to transmit the configuration information to the terminal device.
[0013] In a ninth aspect, there is provided a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to any one of the above third to fourth aspects.
[0014] In a tenth aspect, there is provided a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to perform at least the method according to any one of the above third to fourth aspects.
[0015] 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
[0016] Some embodiments will now be described with reference to the accompanying drawings, in which:
[0017] Fig. 1A illustrates an example communication network in which embodiments of the present disclosure may be implemented;
[0018] Fig. 1B illustrates an example block diagram illustrating a configuration of gaps between PDCCH search spaces according to some embodiments of the present disclosure;
[0019] Fig. 1C illustrates an example block diagram illustrating a configuration of gaps between PDCCH search spaces and DRX inactive times in a DRX mode according to some embodiments of the present disclosure;
[0020] Fig. 2 illustrates a flowchart illustrating a communication process in accordance with some example embodiments of the present disclosure;
[0021] Fig. 3A illustrates an example block diagram illustrating a configuration for positioning measurements according to some embodiments of the present disclosure;
[0022] Fig. 3B illustrates an example block diagram illustrating another configuration for positioning measurements according to some embodiments of the present disclosure;
[0023] Fig. 3C illustrates an example block diagram illustrating yet a further configuration for positioning measurements according to some embodiments of the present disclosure;
[0024] Fig. 4 illustrates a flowchart of a method implemented at a terminal device according to some embodiments of the present disclosure;
[0025] Fig. 5 illustrates a flowchart of a method implemented at a network device according to some embodiments of the present disclosure;
[0026] Fig. 6 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure; and
[0027] Fig. 7 illustrates a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
[0028] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0029] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.
[0030] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0031] 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.
[0032] 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.
[0033] 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. As used herein, “at least one of the following: <a list of two or more elements>” and “at least one of <a list of two or more elements>” and similar wording, where the list of two or more elements are joined by “and” or “or” , mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.
[0034] As used in this application, the term “circuitry” may refer to one or more or all of the following:
[0035] (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and
[0036] (b) combinations of hardware circuits and software, such as (as applicable) :
[0037] (i) a combination of analog and / or digital hardware circuit (s) with software / firmware and
[0038] (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
[0039] (c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
[0040] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
[0041] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , 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) , the future sixth generation (6G) communication protocols, and / or any other protocols either currently known or to be developed in the future. 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.
[0042] As used herein, the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a gNB distributed unit (gNB-DU) , a gNB central unit (gNB-CU) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
[0043] The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) . The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. In the following description, the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
[0044] As used herein, the term “access network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate. Examples of a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a terminal device, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , and the like.
[0045] At least one example embodiment relates to a wireless NTN system. A NTN system may provide services in areas that cannot be covered by terrestrial cellular networks (i.e. those networks where coverage is provided by means of land-based antennas) , such as isolated or remote areas, on board aircraft or vessels, or may provide enhanced services in other areas. The expanded coverage that may be achieved by means of non-terrestrial networks may provide service continuity for terminal devices such as machine type communication (MTC) devices or loT devices, or for passengers on board moving platforms (e.g. passenger vehicles such as aircraft, ships, high speed trains, or buses) . Other benefits may arise from the use of non-terrestrial networks for providing multicast / broadcast resources for data delivery.
[0046] At least one NTN device in the NTN system may function as a transmission relay node or an access network device. For example, part of the access network device or the entire access network device may be hosted on the NTN device. While the various example embodiments of the present disclosure are discussed in connection with the 5G wireless communication standard for the sake of clarity and convenience, the example embodiments are not limited thereto, and one of ordinary skill in the art would recognize the example embodiments may be applicable to other wireless communication standards, such as the 4G wireless protocol, a future 6G wireless protocol, a future 7G wireless protocol, a Wi-Fi system, etc.
[0047] As mentioned above, positioning measurements are needed for the terminal device to perform pre-compensation of uplink transmissions in terms of time and frequency adjustments. The pre-compensation is based on the terminal device being aware of the position of the target NTN device and the terminal device’s own position. The position of the target NTN device may be obtained e.g., via satellite assistance information broadcast in SIB31. The terminal device’s own position may be acquired via positioning measurements. As used herein, the term “positions” refers to geographic positions. The term “positioning measurements” may refer to Global Navigation Satellite System (GNSS) measurements, multi-round-trip-time (multi-RTT) positioning measurements, observed time difference of arrival (OTDOA) positioning measurements or other 3GPP-based positioning measurements. In the following, embodiments of the present disclosure may be described with reference to the GNSS measurements. It should be understood, that embodiments of the present disclosure may also be applied to any other positioning measurements. By calculating the distance between the terminal device and the NTN device and how the distance will change during a transmission, the terminal device can determine when to transmit and receive data to / from the NTN device as well as some transmission / reception related parameters.
[0048] In RAN#94, a new work item (WI) on NB-IoT / enhanced-MTC (NB-IoT / eMTC) supporting for NTN was approved. In terms of IoT-NTN performance enhancement, further studies are needed on improved GNSS operations for a new position fix for UE pre-compensation during long connections and for reducing power consumption. In Release 18, simultaneous GNSS measurements and cellular NTN communications (e.g., NB-IoT / eMTC operations over NTN) are still not assumed. In other words, the terminal device is not able to communicate with the NTN system and perform GNSS measurements simultaneously.
[0049] GNSS and ephemeris information are two important information for the UE to perform time and frequency synchronizations automatically. The accuracy of the GNSS and ephemeris information will directly impact on the accuracy of the synchronization. In Release 17, the work was limited to short and sporadic connection. GNSS validation duration is defined in Release 17 which indicates the remaining GNSS validity duration in the UE. For sporadic short transmissions, the UE in RRC_CONNECTED should go back to an idle mode and re-acquire a GNSS position fix if the GNSS validity expires which means GNSS becomes outdated. In order to address broader use cases of long connection time, it is important to consider how the UE can obtain a new GNSS-based position fix during the long connection.
[0050] The RAN1#110 has agreed to support the network device to at least aperiodically trigger the terminal device to perform GNSS measurements. If the network device aperiodically triggers to the terminal device to perform GNSS measurements, a MAC CE is used. The terminal device reports GNSS position fix time duration for measurement at least during the initial access stage. In a connected mode, the terminal device may report GNSS validation duration to network device with MAC CE.
[0051] The RAN1#111 has agreed that for GNSS measurement in a RRC connected mode, if the network device aperiodically triggers the connected terminal device to perform GNSS measurements, the terminal device can re-acquire GNSS position fix with a gap. Further studies on details of the gap configuration are still needed. The terminal device may re-acquire GNSS positions autonomously (when configured by the network device) if the terminal device does not receive trigger indications from the network device to perform GNSS measurements. Further studies for the autonomous GNSS measurements based on configured timing are still needed.
[0052] Additionally, due to the GNSS measurement is designed for long data connection while the simultaneous use of GNSS and IoT operations is not assumed, the GNSS measurements interworking with existing UE procedures may need to be further discussed. The RAN1 has agreed that the UE can autonomously re-acquire GNSS position fix during an inactive state of a Connected DRX (C-DRX) mode. Further studies in terms of when the UE can re-acquire GNSS position fix during an inactive state of a C-DRX mode are still needed. In the following description, the terms “an inactive state of a C-DRX mode” and “an C-DRX inactive state” may be used interchangeably. The RAN1 has further agreed that the UE is not forbidden to autonomously re-acquire GNSS position fix during an C-DRX inactive state and that the configured downlink or uplink transmissions during the C-DRX inactive state should not be impacted.
[0053] However, relying on the C-DRX inactive state for re-acquiring GNSS position fix is a solution with two-sided sword and needs to be well designed considering both the benefit and the impact on communication. One the one hand, performing GNSS measurements in the C-DRX inactive time is beneficial for the communication since GNSS measurements in the C-DRX active time can be avoided or reduced and the communication will not be suspended due to GNSS measurements.
[0054] On the other hand, the C-DRX mode only control the PDCCH monitoring for some defined radio network temporary identifiers (RNTIs) which does not include the paging RNTI (P-RNTI) and the system information RNTI (SI-RNTI) . The UE is still required to monitor PDCCH for P-RNTI and SI-RNTI in C-DRX inactive time. For example, the NTN UE may have to acquire serving cell satellite assistance information (SIB31) during the C-DRX inactive state. This will be necessary if the validity timer T317 for SIB31 is about to expire or has expired. Therefore, the UE will not be able to perform the GNSS measurement during the part of the C-DRX inactive state, which collides with the reception of the SIB31. The UE may also need to monitor PDCCH for Paging message during the inactive state of C-DRX.
[0055] In addition, even in the C-DRX inactive time, the UE may also send a scheduling request (SR) when there is new data arrives, and the C-DRX mode will be active for the scheduling grant reception after the scheduling request is sent. As defined in TS 36.321, when a DRX cycle is configured, the DRX active time includes the time while a SR is sent on PUCCH / SPUCCH and is pending. If this serving cell is part of a non-terrestrial network, the DRX active time is started after the SR transmission that is performed when the SR_COUNTER is 0 for all the SR configurations with pending SR (s) plus the UE-eNB RTT. If the GNSS measurement is performed in C-DRX inactive time, the SR transmission and uplink (UL) scheduling grant reception will be likely to be blocked, thus the uplink transmission will be delayed. In the following description, the terms “DRX” and “C-DRX” may be used interchangeably.
[0056] Thus, it need to be well studied and designed on how to perform the GNSS measurement during the C-DRX inactive time and have less impact on the communication, e.g., UL scheduling grant reception as well as monitoring PDCCH for P-RNTI and SI-RNTI.
[0057] In addition to or instead of the C-DRX inactive time, the UE may also make use of gaps already configured for PDCCH search spaces for the GNSS measurements. The term “search space” used herein can refer to a region in a downlink resource grid where PDCCH transmissions may be carried. For example, the terminal device may determine or be configured with one or more monitoring occasions for reception of downlink control information (DCI) . Only as an example, the terminal device may perform blind decoding throughout the search space to find PDCCH transmissions which carries the DCI. The certain region in which the terminal device performs blind decoding may be called “a search space” .
[0058] Details on the search space configuration (e.g., for NB-IoT) are given below in Tables 1 and 2. Table 1 illustrates an example of higher layer signaling for a Narrowband PDCCH (NPDCCH) configuration defined in TS 36.331. In this example, an information element including the fields listed in Table 1 may be referred to as NPDCCH-ConfigDedicated-NB, which may define subframes and resource blocks for monitoring a NPDCCH. Table 2 shows field descriptions of NPDCCH-ConfigDedicated-NB information element.
[0059] Table 1 NPDCCH-ConfigDedicated-NB information element
[0060] Table 2 NPDCCH-ConfigDedicated-NB field descriptions
[0061] NPDCCH related procedures are defined in TS 36.213. The locations of starting subframe k are given by k=kb where kb is the bth consecutive NB-IoT DL subframe from subframe k0, excluding subframes used for transmission of SI messages, and b=u·R, and The subframe k0 is a subframe satisfying the condition where T=Rmax·G and T≥4. For NPDCCH UE-specific search space, G is given by the higher layer parameter npdcch-StartSF-USS, except for NPDCCH candidates associated with a preconfigured uplink resource radio network temporary identifier (PUR-RNTI) in which case it is given by higher layer parameter npdcch-StartSF-USS in PUR-Config-NB. αoffset is given by the higher layer parameter npdcch-Offset-USS, except for NPDCCH candidates associated with PUR-RNTI in which case it is given by higher layer parameter npdcch-Offset-USS in PUR-Config-NB.
[0062] The start offset (αoffset·Rmax·G) in TS 36.213 defines the offset between PDDCH monitoring indications and can become very long depending on the configuration of npdcch-NumRepetitions, npdcch-StartSF-USS and npdcch-Offset-USS in TS 36.331 as shown in Table 2.
[0063] A solution for configuration of positioning measurements is needed. Principle and example embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.
[0064] Fig. 1A illustrates an example communication network 100 in which example embodiments of the present disclosure can be implemented. As shown in Fig. 1A, the communication network 100 includes a terminal device 110, a NTN device 120, a ground station 130, and a data network 140.
[0065] The terminal device 110, the NTN device 120, and / or the ground station 130 may be connected over a wireless network, such as a wireless radio access network (e.g., a 3G wireless access network, a 4G-Long Term Evolution (LTE) network, a 5G-New Radio (e.g., 5G) wireless network, a future 6G wireless network, a future 7G wireless network, etc. ) . The ground station 130 and the data network 140 (e.g., the Internet, an intranet, a wide area network, etc. ) may connect to each other over a wired and / or wireless network. Additionally or alternatively, the ground station 130 may be connected to other core network elements not shown in Fig. 1A, such as servers, access points, switches, routers, nodes, etc.
[0066] The terminal device 110 may be any one of, but not limited to, a mobile device, a tablet, a laptop computer, a wearable device, an Internet of Things (IoT) device, a desktop computer and / or any other type of stationary or portable device capable of operating according to the 5G NR communication standard, and / or other wireless communication standard.
[0067] The NTN device 120 may be a low earth orbiting (LEO) satellite, a medium earth orbiting (MEO) satellite, a geostationary earth orbiting (GEO) satellite, a UAS device (e.g., a drone, a blimp, a balloon, etc. ) , a high altitude platform station (HAPS) vehicle, a manned aerial vehicle (MAV) device, etc. Further, there may be a plurality of NTN devices that act as a constellation of NTN devices, providing a coordinated coverage area among the plurality of NTN devices, e.g., a constellation of satellites, a constellation of UASs, and / or a constellation of satellites and UASs, etc.
[0068] In some embodiments, the NTN device 120 may function as a transmission relay node between the ground station 130 and the terminal device 110 in a transparent manner. For example, the same data may be sent back down to the ground station 130 as is received by the NTN device 120 from the terminal device 110, with only frequency conversion and amplification of the wireless communication signal. Similarly, the same data may be sent back down to the terminal device 110 as is received by the NTN device 120 from the ground station 130, with only frequency conversion and amplification of the wireless communication signal.
[0069] In some embodiments, the NTN device 120 may function as an entire or part of an access network device according to an underlying cellular and / or wireless network communications protocol. For example, the NTN device 120 may operate as a 5G gNB node or an LTE ng-eNB node, etc., but the example embodiments are not limited thereto. In some embodiments, when the NTN device 120 operates as the access network device, the NTN device 120 will digitally process wireless communication signals to / from the terminal device 110 and is the wireless communication signal transmission and reception point. This requires the NTN device 120 to have sufficient on-board processing capabilities to be able to include a nodeB functionality.
[0070] In some embodiments, the terminal device 110 may perform positioning measurements to obtain its positioning information. In this way, the terminal device 110 may be aware of the distance between the terminal device 110 and the NTN device 120 and thus be able to perform pre-compensation of uplink transmissions in terms of time and frequency adjustments during the NTN communication. The validity of the positioning information of the terminal device 110 may expire after a period of time elapses since the positioning measurements and the terminal device 110 needs to perform positioning measurements again so as to ensure the reliability of the NTN communication. When performing the positioning measurements, the terminal device 110 may be unable to perform NTN cellular communication simultaneously.
[0071] It is to be understood that the architecture of the network 100 shown in Fig. 1A is described only for the purpose of illustration without suggesting any limitation. In addition, it is to be understood that the numbers of terminal devices, NTN devices, ground stations and data networks and their connections shown in Fig. 1A are only for the purpose of illustration without suggesting any limitations. The network 100 may include any suitable number of terminal devices, NTN devices, ground stations, data networks and other devices adapted for implementing example embodiments of the present disclosure. Although not shown, it would be appreciated that one or more additional devices may be deployed in the network 100.
[0072] Communications in the communication network 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) and the sixth generation (6G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and / or any other technologies currently known or to be developed in the future.
[0073] As mentioned above, the terminal device may make use of DRX inactive times for the positioning measurements. Alternatively or additionally, the terminal device may make use of gaps between PDCCH search spaces for the positioning measurements. Fig. 1B illustrates an example block diagram illustrating a configuration 150A of gaps between PDCCH search spaces according to some embodiments of the present disclosure.
[0074] As shown in Fig. 1B, the terminal device 110 may determine or be configured with search spaces 161 and 162 for monitoring potential PDCCH transmissions. The numbers and distributions of search spaces in Fig. 1B are for illustration purpose only without suggesting any limitations. Other search space distributions or a greater or less number of search spaces are also possible. Gaps may be configured between the neighboring search spaces for transmissions or receptions scheduled by the potential PDCCH transmission in the search spaces. For example, a configured gap 171 may be located between the search spaces 161 and 162.
[0075] In some embodiments, the terminal device 110 may make use of the configured gap 171 for the positioning measurements. Similar to C-DRX inactive time, the terminal device is not required to monitor potential PDCCH transmissions during the configured gap between PDCCH search space. Therefore, the configured search space gap can be used for GNSS measurements. Thus, how to perform the GNSS measurements during the configured gap between PDCCH search spaces needs to be studied.
[0076] In some scenarios, when the terminal device is in a C-DRX mode, a configured gap between PDCCH search spaces and a C-DRX inactive time may be consecutive, how to perform the GNSS measurements during the consecutive time period comprising the configured gap between PDCCH search spaces and the C-DRX inactive time also needs to be studied. Fig. 1C illustrates an example block diagram illustrating a configuration 150B of gaps between PDCCH search spaces and DRX inactive times in a DRX mode according to some embodiments of the present disclosure. As shown in Fig. 1C, the terminal device 110 may determine or be configured with search spaces 163, 164 and 165 for monitoring potential PDCCH transmissions. The numbers and distributions of search spaces in Fig. 1C are for illustration purpose only without suggesting any limitations. Other search space distributions or a greater or less number of search spaces are also possible. Configured gaps 181 and 182 may be located between neighboring search spaces.
[0077] The terminal device 110 may be configured in a DRX mode. As shown in Fig. 1C, the terminal device may be in a DRX active state in the DRX active time 181 and enters a DRX inactive state in the DRX inactive time 182. In the example configuration 150B, the configured gap 172 is located in the DRX active time 181 while the configured gap 173 partially overlaps with the DRX inactive time 182. In other words, the configured gap 173 and the DRX inactive time 182 constitute a consecutive time period 191.
[0078] In some embodiments, the terminal device 110 may make use of the configured gap 172 or 173 for the positioning measurements. Alternatively or additionally, the terminal device 110 may make use of the DRX inactive time 182 for the positioning measurements. In some embodiments, the terminal device 110 may make use of the consecutive time period 191 comprising the configured gap 173 and the DRX inactive time 182 for the positioning measurements.
[0079] Reference is now made to Fig. 2, which shows a communication process 200 according to an embodiment of the present disclosure. For the purpose of discussion, the process 200 will be described with reference to Fig. 1A. The process 200 may involve the terminal device 110 as illustrated in Fig. 1A. In some embodiments, the process 200 may also involve a network device 220. The network device 220 may correspond to an access network device serving the terminal device 110. For example, the network device 220 may correspond to the NTN device 120 when the NTN device 120 functions as an access network device serving the terminal device 110.
[0080] Alternatively, the network device 220 may correspond to the ground station 130 as shown in Fig. 1A when the ground station 130 functions as an access network device serving the terminal device 110 and the NTN device 120 functions as a transmission relay node between the ground station 130 and the terminal device 110 in a transparent manner. Alternatively, the network device 220 may correspond to an aggregation of the NTN device 120 and the ground station 130 when the NTN device 120 and the ground station 130 corporately function as an access network device serving the terminal device 110. It would be appreciated that although the process 200 has been described in the communication system 100 of Fig. 1A, this process may be likewise applied to other communication scenarios.
[0081] In the process 200, the terminal device 110 determines 210 a time period based on at least one of (i) a gap between a first PDCCH search space and a second PDCCH search space or (ii) a DRX inactive time. If a first condition associated with the time period and a second condition associated with a timer are fulfilled, the terminal device 110 performs 212 a positioning measurement in the time period. In this way, a scheme for performing the positioning measurement is designed. The terminal device may perform GNSS measurements in a PDCCH monitoring inactive state (i.e., with no PDCCH monitoring) , with which not only the terminal device can re-acquire GNSS position fix during the PDCCH monitoring inactive state to avoid interruption during the connection, but also the impact of GNSS measurements on the communication can be controlled / reduced. The flexibility of the positioning measurement of the terminal device may be enhanced with less impact on the communication.
[0082] In some implementations, the time period may comprise the gap between the first PDCCH search space and the second PDCCH search space, e.g., the configured gap 171 in Fig. 1B or the configured gap 172 or 173 in Fig. 1C. In some implementations, if a DRX mode is configured, the time period may comprise the DRX inactive time, e.g., the DRX inactive time 182 in Fig. 1C. In some implementations, if the gap between the first PDCCH search space and the second PDCCH search space and the DRX inactive time are consecutive, the time period may comprise a consecutive time period comprising the gap and the DRX inactive time, e.g., the consecutive time period 191 in Fig. 1C.
[0083] In some embodiments, the first condition may comprise that the time period is longer than a positioning measurement duration. The second condition may comprise that a duration has elapsed after a start time of the timer. In some implementations, the timer may be a validity timer started after a previous positioning measurement prior to the time period. The positioning measurement may comprise a GNSS measurement.
[0084] For example, the terminal device 110 may autonomously perform a GNSS measurement during a PDCCH monitoring inactive state if the PDCCH monitoring inactive time period is longer than the GNSS measurement duration and the GNSS validity timer has already been started for a duration X. With these conditions, the GNSS measurement will not be performed frequently. Unnecessary GNSS measurements in PDCCH monitoring inactive state can be avoided. Thus, impacts on the communication may be avoided.
[0085] In some implementations, the duration may be predetermined. In other words, the duration X may be predetermined by the terminal device 110. Alternatively, the duration may be configured by the network device 220.
[0086] In some embodiments, the positioning measurement may be started at a time point when a duration has elapsed after a start time of the timer. In an example implementation, the terminal device may start to re-acquire GNSS position fix autonomously at the time-point of the GNSS validity timer start time +X.
[0087] Reference is now made to Fig. 3A, which illustrates an example block diagram illustrating a configuration 300A for positioning measurements according to some embodiments of the present disclosure. As shown in Fig. 3A, the terminal device 110 may determine a time period 321. The time period may also be referred to as a PDCCH monitoring inactive time period. The terminal device may be in a PDCCH monitoring inactive state in the time period. In other words, there is no PDCCH monitoring in the time period 321. As mentioned above, the time period 321 may be the configured search space gap (e.g., the configured gap 171 in Fig. 1B or the configured gap 172 or 173 in Fig. 1C) or a DRX inactive time (e.g., the DRX inactive time 182 in Fig. 1C) . In some implementations, if a DRX inactive time and a configured search space gap between PDCCH search spaces and are consecutive, the time period 321 may comprise the consecutive time period comprising the configured search space gap and the DRX inactive time, e.g., the consecutive time period 191 in Fig. 1C.
[0088] As shown in Fig. 3A, the terminal device 110 may autonomously perform a GNSS measurement 312 during the PDCCH monitoring inactive state 321 when the PDCCH monitoring inactive time period is longer than the GNSS measurement duration (i.e., the duration of the GNSS measurement 312) . The terminal device 110 may start a GNSS validity timer at the instance T0 after the GNSS measurement 311. The instance T0 may be referred to the GNSS validity timer start time. To avoid frequent GNSS measurements, the terminal device 110 may perform a GNSS measurement 312 autonomously only when the GNSS validity timer has already been started for a duration X. In other words, the terminal device 110 may re-acquire a GNSS position fix autonomously at the instance T1 = T0 + X.
[0089] In some embodiments, the positioning measurement may be started at a time point in the time period such that the positioning measurement ends at an end of the time period. In other words, the terminal device may start to re-acquire GNSS position fix autonomously at a time point in a PDCCH monitoring inactive state so as to finish the GNSS measurement right before the terminal device enters a PDCCH monitoring active state.
[0090] Reference is now made to Fig. 3B, which illustrates an example block diagram illustrating another configuration 300B for positioning measurements according to some embodiments of the present disclosure. The same reference numerals are used to denote the elements or components described in Fig. 3B having the same operations as the elements or components described in Fig. 3A, and detailed description thereof will be omitted.
[0091] As shown in Fig. 3B, the terminal device 110 may autonomously perform a GNSS measurement 312 during the PDCCH monitoring inactive state 321 when the PDCCH monitoring inactive time period is longer than the GNSS measurement duration and the GNSS validity timer has already been started for a duration X. At the instance T3, the terminal device 110 enters a PDCCH monitoring active state, e.g., PDCCH search spaces in which potential PDCCH transmissions may be monitored. In the example implementation of Fig. 3B, the terminal device 110 may re-acquire a GNSS position fix autonomously at the instance T2 such that the GNSS measurement is finished at the instance T3.
[0092] Since the GNSS measurement duration and the PDCCH monitoring inactive time period are not fixed and may vary over time, if there is only small time difference to complete the GNSS in the PDCCH monitoring inactive state, the GNSS measurement may be advanced to make full use of the PDCCH monitoring inactive state for GNSS measurements. In some embodiments, if a length of time from a first time point when a duration has elapsed after a start time of the timer to an end of the time period is shorter than a positioning measurement duration and a difference between the length of time and the positioning measurement duration is shorter than a threshold duration, the positioning measurement may be started at a second time point earlier than the first time point such that the positioning measurement ends at an end of the time period.
[0093] Reference is now made to Fig. 3C, which illustrates an example block diagram illustrating yet a further configuration 300C for positioning measurements according to some embodiments of the present disclosure. The same reference numerals are used to denote the elements or components described in Fig. 3C having the same operations as the elements or components described in Figs. 3A and 3B, and detailed description thereof will be omitted.
[0094] In the example of Fig. 3C, if the terminal device 110 starts the GNSS measurement at the instance T1 = T0 + X, the terminal device 110 can’t finish the GNSS measurement in PDCCH monitoring inactive state 321. In other words, the GNSS measurement duration is longer than the time duration Δt from the instance T1 to the instance T3. In such event, if the difference between the GNSS measurement duration and the time duration Δt =T3-T1 is less than a threshold duration 331, the terminal device 110 may advance the GNSS measurement 312 at the instance T4 such that the GNSS measurement is finished at the instance T3, i.e., right before the terminal device 110 enters a PDCCH monitoring active state. The instance T4 may be earlier than the instance T1.
[0095] After performing the GNSS measurement, the terminal device may report or inform the successful GNSS measurement to the network device. The network device may then cancel the scheduling GNSS measurement gap or will not schedule the aperiodic GNSS measurement gap.
[0096] In some embodiments, the positioning measurement duration may be based on a positioning measurement fix duration reported to the network device 220 by the terminal device 110. Alternatively or additionally, the positioning measurement duration may be based on a configuration of a positioning measurement duration received from the network device 220.
[0097] In some embodiments, the threshold duration may be predetermined. In other words, the threshold duration 331 may be predetermined by the terminal device 110 or by the standardization specification. Alternatively, the threshold duration 331 may be configured by the network device 220.
[0098] Returning back to Fig. 2, in some embodiments, the network device 220 may determine 202 configuration information 206 related to the second condition for the terminal device 110 to perform a positioning measurement in the time period. The network device 220 may transmit 204 the configuration information 206 to the terminal device 110. The terminal device 110 may receive 208 the configuration information 206 from the network device 220 and perform 212 the positioning measurement based on the configuration information 206. In some implementations, the configuration information 206 may comprise a configuration of the duration (e.g., the duration X in Figs. 3A-3C) . Alternatively or additionally, the configuration information 206 may comprise a configuration of the threshold duration (e.g., the threshold duration 331 in Fig. 3C) .
[0099] With some embodiments of the present disclosure, not only the terminal device can re-acquire GNSS position fix during a PDCCH monitoring inactive time to avoid interruption during the connection, but also the impact of GNSS measurements on the communication can be controlled / reduced.
[0100] Fig. 4 shows an example method 400 implemented at a terminal device in accordance with some embodiments of the present disclosure. In some embodiments, the method 400 can be implemented at a device in a communication network, such as the terminal device 110 as shown in Fig. 1A. Additionally or alternatively, the method 400 can be implemented at other devices shown in Fig. 1A. In some other embodiments, the method 400 may be implemented at devices not shown in Fig. 1A. Further, it is to be understood that the method 400 may include additional blocks not shown and / or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 400 will be described from the perspective of the terminal device 110 with reference to Fig. 1A.
[0101] At block 410, the terminal device 110 determines a time period based on at least one of (i) a gap between a first PDCCH search space and a second PDCCH search space or (ii) a DRX inactive time. At block 420, the terminal device 110 determines whether a first condition associated with the time period and a second condition associated with a timer are fulfilled. If the first condition and the second condition are fulfilled, the method 400 proceeds to block 430. At block 430, the terminal device 110 performs a positioning measurement in the time period. In this way, the flexibility of the positioning measurement of the terminal device may be enhanced with less impact on the communication, and the communication efficiency may thus be improved.
[0102] In some embodiments, the time period may comprise the gap. Alternatively or additionally, the time period may comprise the DRX inactive time. Alternatively or additionally, the time period may comprise a consecutive time period comprising the gap and the DRX inactive time in the case that the gap and the DRX inactive time are consecutive.
[0103] In some embodiments, the first condition may comprise that the time period is longer than a positioning measurement duration. The second condition may comprise that a duration has elapsed after a start time of the timer.
[0104] In some embodiments, the positioning measurement may be started at a time point when a duration has elapsed after a start time of the timer. Alternatively, the positioning measurement may be started at a time point in the time period such that the positioning measurement ends at an end of the time period.
[0105] In some embodiments, in the case that a length of time from a first time point when a duration has elapsed after a start time of the timer to an end of the time period is shorter than a positioning measurement duration and a difference between the length of time and the positioning measurement duration is shorter than a threshold duration, the positioning measurement may be started at a second time point earlier than the first time point such that the positioning measurement ends at an end of the time period.
[0106] In some embodiments, the duration may be configured by the network device 220 or predetermined. In some embodiments, the threshold duration may be configured by the network device 220 or predetermined. In some embodiments, the positioning measurement duration may be based on a positioning measurement fix duration reported to the network device 220 by the terminal device 110. Alternatively or additionally, the positioning measurement duration may be based on a configuration of a positioning measurement duration received from the network device 220.
[0107] In some embodiments, the timer may be a validity timer started after a previous positioning measurement prior to the time period. In some embodiments, the positioning measurement may comprise a GNSS measurement.
[0108] Reference is now made to Fig. 5, which shows an example method 500 implemented at a network device in accordance with some embodiments of the present disclosure. In some embodiments, the method 500 can be implemented at a device in a communication network, such as the network device 200 as shown in Fig. 2 or at least one of the NTN device 120 or the ground station 130 as shown in Fig. 1A. Additionally or alternatively, the method 500 can be implemented at other devices shown in Figs. 1A and 2. In some other embodiments, the method 500 may be implemented at devices not shown in Figs. 1A and 2. Further, it is to be understood that the method 500 may include additional blocks not shown and / or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 500 will be described from the perspective of the network device 220 with reference to Fig. 2.
[0109] At block 510, the network device 220 determines configuration information related to a condition for a terminal device 110 to perform a positioning measurement in a time period. The time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device 110. The condition is associated with a timer. At block 520, the network device 220 transmits the configuration information to the terminal device 110. In this way, the flexibility of the positioning measurement of the terminal device may be enhanced with less impact on the communication.
[0110] In some embodiments, the time period may comprise the gap. Alternatively or additionally, the time period may comprise the DRX inactive time. Alternatively or additionally, the time period may comprise a consecutive time period comprising the gap and the DRX inactive time in the case that the gap and the DRX inactive time are consecutive.
[0111] In some embodiments, the condition may comprise that a duration has elapsed after a start time of the timer. In some embodiments, the configuration information may comprise a configuration of the duration. Alternatively or additionally, the configuration information may comprise a configuration of a threshold duration, wherein in the case that a length of time from a first time point when the duration has elapsed after a start time of the timer to an end of the time period is shorter than a positioning measurement duration and a difference between the length of time and the positioning measurement duration is shorter than the threshold duration, the positioning measurement of the terminal device 110 is to be started at a second time point earlier than the first time point such that the positioning measurement ends at an end of the time period.
[0112] In some embodiments, the timer may be a validity timer started after a previous positioning measurement prior to the time period. In some embodiments, the positioning measurement may comprise a GNSS measurement.
[0113] In some embodiments, an apparatus capable of performing any of the method 400 (for example, the terminal device 120) may comprise means for performing the respective steps of the method 400. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0114] In some embodiments, the apparatus comprises means for determining a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; and means for based on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled, performing a positioning measurement in the time period.
[0115] In some embodiments, the time period comprises one of the following: the gap; the DRX inactive time; or a consecutive time period comprising the gap and the DRX inactive time in the case that the gap and the DRX inactive time are consecutive.
[0116] In some embodiments, the first condition comprises that the time period is longer than a positioning measurement duration. In some embodiments, the second condition comprises that a duration has elapsed after a start time of the timer.
[0117] In some embodiments, the positioning measurement is started at a time point when a duration has elapsed after a start time of the timer. In some embodiments, the positioning measurement is started at a time point in the time period such that the positioning measurement ends at an end of the time period.
[0118] In some embodiments, in the case that a length of time from a first time point when a duration has elapsed after a start time of the timer to an end of the time period is shorter than a positioning measurement duration and a difference between the length of time and the positioning measurement duration is shorter than a threshold duration, the positioning measurement is started at a second time point earlier than the first time point such that the positioning measurement ends at an end of the time period.
[0119] In some embodiments, the duration is configured by a network device or predetermined. In some embodiments, the threshold duration is configured by a network device or predetermined. In some embodiments, the positioning measurement duration is based on at least one of: a positioning measurement fix duration reported to the network device by the terminal device, or a configuration of a positioning measurement duration received from the network device.
[0120] In some embodiments, the timer is a validity timer started after a previous positioning measurement prior to the time period. In some embodiments, the positioning measurement comprises a global navigation satellite system (GNSS) measurement.
[0121] In some embodiments, the apparatus further comprises means for performing other steps in some embodiments of the method 400. In some embodiments, the means comprises at least one processor and at least one memory including computer program code. The at least one memory and the computer program code are configured to, with the at least one processor, cause the performance of the apparatus.
[0122] In some embodiments, an apparatus capable of performing the method 500 (for example, the network device 200 as shown in Fig. 2 or at least one of the NTN device 120 or the ground station 130 as shown in Fig. 1A) may comprise means for performing the respective steps of the method 500. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0123] In some embodiments, the apparatus comprises: means for determining configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; and means for transmitting the configuration information to the terminal device.
[0124] In some embodiments, the time period comprises one of the following: the gap; the DRX inactive time; or a consecutive time period comprising the gap and the DRX inactive time in the case that the gap and the DRX inactive time are consecutive.
[0125] In some embodiments, the condition comprises that a duration has elapsed after a start time of the timer. In some embodiments, the configuration information comprises at least one of: a configuration of the duration; or a configuration of a threshold duration, wherein in the case that a length of time from a first time point when the duration has elapsed after a start time of the timer to an end of the time period is shorter than a positioning measurement duration and a difference between the length of time and the positioning measurement duration is shorter than the threshold duration, the positioning measurement of the terminal device is to be started at a second time point earlier than the first time point such that the positioning measurement ends at an end of the time period.
[0126] In some embodiments, the timer is a validity timer started after a previous positioning measurement of the terminal device prior to the time period. In some embodiments, the positioning measurement comprises a global navigation satellite system (GNSS) measurement.
[0127] In some embodiments, the apparatus further comprises means for performing other steps in some embodiments of the method 500. In some embodiments, the means comprises at least one processor and at least one memory including computer program code. The at least one memory and the computer program code are configured to, with the at least one processor, cause the performance of the apparatus.
[0128] Fig. 6 is a simplified block diagram of a device 600 that is suitable for implementing embodiments of the present disclosure. The device 600 may be provided to implement the communication device, for example the terminal device 110, the NTN device 120, the ground station 130 and the data network 140 as shown in Fig. 1A or the network device as shown in Fig. 2. As shown, the device 600 includes one or more processors 610, one or more memories 620 coupled to the processor 610, and one or more communication modules 640 coupled to the processor 610.
[0129] The communication module 640 is for bidirectional communications. The communication module 640 has at least one antenna to facilitate communication. The communication interface may represent any interface that is necessary for communication with other network elements.
[0130] The processor 610 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 600 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.
[0131] The memory 620 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 624, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and / or optical storage. Examples of the volatile memories include, but are not limited to, a random access memory (RAM) 622 and other volatile memories that will not last in the power-down duration.
[0132] A computer program 630 includes computer executable instructions that are executed by the associated processor 610. The program 630 may be stored in the ROM 624. The processor 610 may perform any suitable actions and processing by loading the program 630 into the RAM 622.
[0133] The embodiments of the present disclosure may be implemented by means of the program 630 so that the device 600 may perform any process of the disclosure as discussed with reference to Figs. 2-5. The embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
[0134] In some embodiments, the program 630 may be tangibly contained in a computer readable medium which may be included in the device 600 (such as in the memory 620) or other storage devices that are accessible by the device 600. The device 600 may load the program 630 from the computer readable medium to the RAM 622 for execution. The computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. Fig. 7 shows an example of the computer readable medium 700 in form of CD or DVD. The computer readable medium has the program 630 stored thereon.
[0135] 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 representations, it is to be understood that the block, apparatus, system, technique or method 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.
[0136] 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 methods as described above with reference to Figs. 2-5. 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.
[0137] 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.
[0138] In the context of the present disclosure, the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.
[0139] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer 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 computer 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. The term “non-transitory, ” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .
[0140] 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.
[0141] Although the present disclosure has been described in languages 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; andat least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to:determine a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; andbased on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled, perform a positioning measurement in the time period.2.The terminal device of claim 1, wherein the time period comprises one of the following:the gap;the DRX inactive time; ora consecutive time period comprising the gap and the DRX inactive time in the case that the gap and the DRX inactive time are consecutive.3.The terminal device of claim 1 or 2, wherein the first condition comprises that the time period is longer than a positioning measurement duration.4.The terminal device of any of claims 1-3, wherein the second condition comprises that a duration has elapsed after a start time of the timer.5.The terminal device of any of claims 1-4, wherein the positioning measurement is started at a time point when a duration has elapsed after a start time of the timer.6.The terminal device of any of claims 1-4, wherein the positioning measurement is started at a time point in the time period such that the positioning measurement ends at an end of the time period.7.The terminal device of any of claims 1-4, wherein in the case that a length of time from a first time point when a duration has elapsed after a start time of the timer to an end of the time period is shorter than a positioning measurement duration and a difference between the length of time and the positioning measurement duration is shorter than a threshold duration, the positioning measurement is started at a second time point earlier than the first time point such that the positioning measurement ends at an end of the time period.8.The terminal device of any of claims 4-7, wherein the duration is configured by a network device or predetermined.9.The terminal device of claim 7, wherein the threshold duration is configured by a network device or predetermined.10.The terminal device of claim 3 or 7, wherein the positioning measurement duration is based on at least one of:a positioning measurement fix duration reported to the network device by the terminal device, ora configuration of a positioning measurement duration received from the network device.11.The terminal device of any of claims 1-10, wherein the timer is a validity timer started after a previous positioning measurement prior to the time period.12.The terminal device of any of claims 1-11, wherein the positioning measurement comprises a global navigation satellite system (GNSS) measurement.13.A network device comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to:determine configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; andtransmit the configuration information to the terminal device.14.The network device of claim 13, wherein the time period comprises one of the following:the gap;the DRX inactive time; ora consecutive time period comprising the gap and the DRX inactive time in the case that the gap and the DRX inactive time are consecutive.15.The network device of any of claims 13 or 14, wherein the condition comprises that a duration has elapsed after a start time of the timer.16.The network device of claim 15, wherein the configuration information comprises at least one of:a configuration of the duration; ora configuration of a threshold duration, wherein in the case that a length of time from a first time point when the duration has elapsed after a start time of the timer to an end of the time period is shorter than a positioning measurement duration and a difference between the length of time and the positioning measurement duration is shorter than the threshold duration, the positioning measurement of the terminal device is to be started at a second time point earlier than the first time point such that the positioning measurement ends at an end of the time period.17.The network device of any of claims 13-16, wherein the timer is a validity timer started after a previous positioning measurement of the terminal device prior to the time period.18.The network device of any of claims 13-17, wherein the positioning measurement comprises a global navigation satellite system (GNSS) measurement.19.A method comprising:determining a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; andbased on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled, performing a positioning measurement in the time period.20.A method comprising:determining configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; andtransmitting the configuration information to the terminal device.21.An apparatus, comprising:means for determining a time period based on at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time; andmeans for based on determining that a first condition associated with the time period and a second condition associated with a timer are fulfilled, performing a positioning measurement in the time period.22.An apparatus, comprising:means for determining configuration information related to a condition for a terminal device to perform a positioning measurement in a time period, wherein the time period is associated with at least one of (i) a gap between a first physical downlink control channel (PDCCH) search space and a second PDCCH search space or (ii) a discontinuous reception (DRX) inactive time of the terminal device, the condition is associated with a timer; andmeans for transmitting the configuration information to the terminal device.23.A non-transitory computer readable medium comprising program instructions that, when executed by an apparatus, cause the apparatus to perform at least the method of claim 19 or 20.
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