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WO2025097319A1 - Fourniture de ressource préconfigurée pour une cellule cible dans un réseau non terrestre - Google Patents

Fourniture de ressource préconfigurée pour une cellule cible dans un réseau non terrestre Download PDF

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Publication number
WO2025097319A1
WO2025097319A1 PCT/CN2023/130313 CN2023130313W WO2025097319A1 WO 2025097319 A1 WO2025097319 A1 WO 2025097319A1 CN 2023130313 W CN2023130313 W CN 2023130313W WO 2025097319 A1 WO2025097319 A1 WO 2025097319A1
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WO
WIPO (PCT)
Prior art keywords
uplink resources
configured uplink
target cell
configuration
cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2023/130313
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English (en)
Inventor
Enric Juan
Mads LAURIDSEN
Ping Yuan
Srinivasan Selvaganapathy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Original Assignee
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co Ltd, Nokia Solutions and Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co Ltd
Priority to PCT/CN2023/130313 priority Critical patent/WO2025097319A1/fr
Publication of WO2025097319A1 publication Critical patent/WO2025097319A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure

Definitions

  • Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for provisioning preconfigured resource for target cell in non-terrestrial network (NTN) .
  • NTN non-terrestrial network
  • 5G new radio 5G new radio
  • NTN non-terrestrial networks
  • 3GPP 3rd Generation Partnership Project
  • NB-IoT narrow band internet of Things
  • eMTC enhanced Machine-Type Communication
  • the base stations are deployed on earth, but communicating with the user equipment (UE) via a satellite, which acts as a relay/amplify and forward type of device.
  • the satellites are used to provide communication coverage over a very large area that may be otherwise unreachable by cellular networks.
  • Such functionality can be used to connect Internet of Things (IoT) devices globally as well as provide personal communication in remote areas and in disaster relief.
  • IoT Internet of Things
  • a first apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus at least to: receive, from a second apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell; and perform, using the pre-configured uplink resources, the re-establishment procedure in the target cell.
  • a second apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus at least to: transmit, to a first apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell.
  • a method comprises: receiving, from a second apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell; and performing, using the pre-configured uplink resources, the re-establishment procedure in the target cell.
  • a method comprises: transmitting, to a first apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell.
  • a first apparatus comprises means for receiving, from a second apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell; and means for performing, using the pre-configured uplink resources, the re-establishment procedure in the target cell.
  • a second apparatus comprises means for transmitting, to a first apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell.
  • a computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the third aspect.
  • a computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the fourth aspect.
  • FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented
  • FIG. 2 illustrates an example of random access channel (RACH) -based radio resource control (RRC) re-establishment procedure
  • FIG. 3A illustrates a signaling chart for provisioning preconfigured resource for target cell in NTN according to some example embodiments of the present disclosure
  • FIG. 3B illustrates an example of RACH-less RRC re-establishment procedure according to some example embodiments of the present disclosure
  • FIG. 4 illustrates a further signaling chart for provisioning preconfigured resource for target cell in NTN according to some example embodiments of the present disclosure
  • FIG. 5 illustrates a flowchart of a method implemented at a first apparatus according to some example embodiments of the present disclosure
  • FIG. 6 illustrates a flowchart of a method implemented at a second apparatus according to some example embodiments of the present disclosure
  • FIG. 7 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • FIG. 8 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.
  • 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.
  • performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.
  • circuitry may refer to one or more or all of the following:
  • 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.
  • 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.
  • the term “communication network” refers to a network following any suitable communication standards, such as New Radio (NR) , 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) , enhanced Machine Type Communication (eMTC) and so on.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • eMTC enhanced Machine Type Communication
  • 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 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.
  • 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) , an NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite, a geosynchronous earth orbit (GEO) satellite and a medium earth orbit (MEO) satellite, an aircraft network device,
  • radio access network (RAN) split architecture comprises a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node.
  • An IAB node comprises a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.
  • IAB-MT Mobile Terminal
  • terminal device refers to any end device that may be capable of wireless communication.
  • 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) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • 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 (IoT) 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/
  • the terminal device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node) .
  • MT Mobile Termination
  • IAB node e.g., a relay node
  • the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
  • the term “resource, ” “transmission resource, ” “resource block, ” “physical resource block” (PRB) , “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other combination of the time, frequency, space and/or code domain resource enabling a communication, and the like.
  • a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
  • FIG. 1 shows an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the communication network 100 may comprise a first apparatus 110 which may be, for example, a terminal device 110.
  • the terminal device may also be discussed as a UE.
  • the communication network 100 may further comprise a second apparatus 120, which may be, for example, a network device 120.
  • the network device may be discussed as a BS, a gNB, or an eNB.
  • the network device 120 may be hosted in a satellite (regenerative architecture) or relayed through a satellite (transparent architecture) .
  • the first apparatus 110 may communicate with the second apparatus 120 within a coverage 101 of the second apparatus 120, for example, the geographical area of the first apparatus 110 is served by a satellite beam or cell from the second apparatus 120.
  • the coverage 101 is also referred to a serving cell 101, which may be, for instance, a non-terrestrial network cell.
  • the first apparatus 110 is moving for example, and thus may need to be handed over to another cell, also referred to as target cell 102.
  • the target cell 102 may be a coverage managed by a third apparatus 130.
  • the third apparatus 130 may be a network device, for example, a gNB, which is independent of the second apparatus 120 and has a coverage 102 acting as the target cell 102 of the first apparatus 110.
  • the communication network 100 may be an NTN network or a network with NTN structure.
  • NTN Network
  • LEO Low Earth Orbit
  • the typical beam footprint size for a LEO satellite was assumed to be between 100-1000 km radius. So, one LEO satellite can cover a very large area on the Earth.
  • EMC Earth-moving cells
  • the communication network 100 may include any suitable number of network devices and terminal devices.
  • links from the network device 120 to the terminal device 110 may be referred to as a downlink (DL)
  • links from the terminal device 110 to the network device 120 may be referred to as an uplink (UL)
  • the network device 120 is a transmitting (TX) device (or a transmitter) and the terminal device 110 is a receiving (RX) device (or receiver)
  • the terminal device 110 is a TX device (or transmitter) and the network device 120 is a RX device (or a receiver) .
  • 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.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • MIMO Multiple-Input Multiple-Output
  • OFDM Orthogonal Frequency Division Multiple
  • DFT-s-OFDM Discrete Fourier Transform spread OFDM
  • Enhancements have been made to the NTN in several aspects. As for mobility, neighbor cell measurements and corresponding measurements triggering have been supported before Radio Link Failure (RLF) , using Rel-17 (TN) NB-IoT, eMTC as a baseline.
  • RLF Radio Link Failure
  • IoT NTN can use the mechanism for neighbour cell measurements in connected mode (specified in Rel-17 for NB-IoT) .
  • Location-based connected mode measurement initiation is supported in earth-moving cell (UE is not required to update the Global Navigation Satellite System (GNSS) location for this) .
  • UE is not required to update the Global Navigation Satellite System (GNSS) location for this) .
  • GNSS Global Navigation Satellite System
  • a serving cell reference location and a distance threshold/radius for detecting when to trigger connected mode measurements will be broadcast for earth-moving cell.
  • the second apparatus 120 may be implemented in a satellite of the NTN network and moves along with the satellite. It is to be understood that the illustrated structure of the communication network 100 is just for purpose of discussion, rather than suggest any limitation. Other suitable structures may be also applied to the communication network 100.
  • the NB-IoT UE is aware of the serving cell stop time based on t-Service, which is included in system information block 3 (SIB3) .
  • SIB3 system information block 3
  • the UE can declare RLF based on t-Service.
  • the UE does not need to wait for timer T310 to expire. This timer was introduced for terrestrial scenarios to allow the UE to recover from a temporary loss of coverage.
  • 3GPP has agreed for the UE to declare radio link failure (RLF) upon reaching t-Service (i.e., serving cell stop time) and start RRC Re-establishment procedure (see agreement below) . That is, if the serving cell t-service expires, stop T310 (if running) and start T311 (i.e., perform cell search and re-establishment without attempting to recover on the current cell for the duration of T310) .
  • RLF radio link failure
  • One of the objectives of RACH access is to provide UE with UL resources and timing advance (TA) , so it can start time-aligned UL transmissions in UE-specific resources.
  • TA Timing Advance
  • the UE should be provisioned with a Timing Advance (TA) and a UL grant so the UE knows the time and frequency resource to start transmitting once the UE has decoded MIB/relevant SIB (s) .
  • RACH-less Handover is supported.
  • RACH-less Handover in NR NTN is a L3 mobility procedure and uses the LTE’s RACH-less Handover procedure as a baseline.
  • For initial UL transmission in RACH-less handover (HO) pre-allocated grant in RACH-less HO command is supported.
  • the UE For RACH-less access, the UE must be provisioned via the serving cell with an UL grant for the target cell (i.e., pre-allocated UL grant) .
  • an UL grant for the target cell i.e., pre-allocated UL grant
  • NB-IoT there is no mechanism to provide UL resources for another cell and thus the RACH-less access is not currently supported.
  • pre-configured uplink resources (PUR) feature is introduced in the cell where the configuration was received.
  • Transmission using PUR allows one UL transmission from RRC_IDLE using a pre-configured UL resource without performing RACH procedure (note the resource may be periodically available) .
  • the UE can request to be configured with PUR or to be configured while in RRC_CONNECTED mode (for example, in the RRC Release message) .
  • a PUR-based transmission is triggered when upper layers request the establishment of the RRC Connection.
  • the UE is required to have a valid PUR and meet the TA validation condition and optionally the Reference Signal Receiving Power (RSRP) validation conditions.
  • the conditions are implemented to ensure the UE performs transmission with a valid TA and to ensure the RSRP has not changed so much that the resource configuration becomes infeasible (e.g., too high Modulation and Coding Scheme (MCS) when RSRP has dropped) .
  • MCS Modulation and Coding Scheme
  • IE information element
  • eMTC LTE/enhanced Machine-Type Communication
  • NB-IoT narrow band internet of Things
  • Embodiments of the present disclosure aim to optimize the RRC re-establishment procedure by providing NTN IoT UEs with UL resources and avoid RACH access.
  • Declaring RLF after t-Service reduces the interruption time but allows all UEs in an EFC to access the new cell at the same time (according to t-Service) , leading to RACH preamble collisions in case of contention-based RACH (CBRA) .
  • CBRA contention-based RACH
  • FIG. 2 illustrates an example of RACH-based RRC re-establishment procedure.
  • FIG. 2 shows a possible timeline for a connected UE in an EFC cell according to the current specification.
  • the UE acquires t-Service from SIB3 while connected to the serving cell.
  • the UE declares a RLF and initiates the cell selection procedure searching for a suitable cell (this procedure could be done prior to t-Service while connected to the serving cell) .
  • MIB master information block
  • SIB master information block
  • the UE After acquiring UL time/frequency resources, the UE sends a “RRC Re-establishment Request” to initiate the RRC Re-establishment procedure.
  • the UE Upon reception at network (NW) side of the “RRC Re-establishment Complete” message, the UE is connected to the new cell.
  • Embodiments of the present disclosure are considering a RACH-less RRC Re-establishment (for example, taking LTE’s approach as baseline) to avoid RACH access at target cell during cell change.
  • the solution proposed by example embodiments of the present disclosure is a different solution for IoT NTN where the UE reduces the interruption time by skipping RACH procedure and instead uses PUR, and furthermore the solution avoids that RRC Re-establishment is initiated by all UEs at the same time after t-Service.
  • the serving cell provides UE-specific PUR configuration in target cell for RACH-less RRC Re-establishment procedure.
  • the main target scenario is EFC deployments since for static UEs there is only one possible target cell, but it could be extended to EMC with location-based triggers and multiple PUR occasions, because that allows UE and NW to estimate when the UE will select a certain target cell.
  • the UE may be configured to transmit the RRC Reconfiguration Complete message using the PUR configuration in the target cell i.e., the transmission of the RRC message is made in the pre-configured resources. This would enable the UE to complete a handover without performing the RACH procedure.
  • FIG. 3A illustrates a signaling chart 300 for provisioning preconfigured resource for target cell in NTN according to some example embodiments of the present disclosure.
  • the signaling chart 300 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120.
  • the first apparatus 110 may be a terminal device, e.g., a UE, and the second apparatus 120 may be a network device, for example located at or implemented at a satellite.
  • the terminal device may be a NB-IoT device and support the NB-IoT standard specifications.
  • the second apparatus 120 transmits (305) , to the first apparatus 110, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus 110 in a target cell 102.
  • the second apparatus 120 may determine the pre-configured uplink resources based on a coordination with a third apparatus 130 managing the target cell 102.
  • the third apparatus 130 may be for example a network device, e.g., a gNB.
  • the pre-configured uplink resources may be associated with a system frame number of the target cell 102.
  • the allocation of the pre-configured uplink resources may depend on the number of the system frames of the target cell 102.
  • the pre-configured uplink resources may be defined in terms of the system frame number of the target cell.
  • the resources may also be defined with finer granularity such as per slot or per subframe.
  • the configuration of the pre-configured uplink resources may indicate various information.
  • the configuration indicates a plurality of non-adjacent time-frequency domain pre-configured uplink resources.
  • the configuration indicates one or more timing advance parameters for using the pre-configured uplink resources.
  • the configuration may comprise at least one information element indicating that the pre-configured uplink resources are in the target cell 102.
  • the first apparatus 110 it receives (310) the configuration of pre-configured uplink resources from the second apparatus 120 before the stop time.
  • the reception (310) of the configuration may be via a radio resource control (RRC) signaling, system information (e.g., a system information block (SIB) ) , and/or the like.
  • RRC radio resource control
  • SIB system information block
  • the first apparatus 110 may determine the pre-configured uplink resources based on a cell radio network temporary identifier of the first apparatus 110. Then, the first apparatus performs (315) the re-establishment procedure in the target cell 102 by using the pre-configured uplink resources. In some embodiments, the first apparatus 110 may transmit, to the target cell 102, an RRC re-establishment request in the re-establishment procedure by using the pre-configured uplink resources.
  • the re-establishment procedure may distinguish from the conventional handover procedure in the sense that the first apparatus will skip the random access procedure and instead directly transmit the RRC Re-establishment request. As described above, the basis for this may be as is the case with NB-IoT devices.
  • the pre-configured uplink resources may occur after the stop time. If the first apparatus 110 is out of the serving cell 101, the first apparatus 110 may keep the configuration of the pre-configured uplink resources. Specifically, in some example embodiments, the first apparatus 110 may keep the configuration of the pre-configured uplink resources at a time point after the first apparatus has left the serving non-terrestrial network cell.
  • the first apparatus 110 may drop (discard) the pre-configured uplink resources configured for one or more candidate cells other than the target cell. That is, the dropping of the pre-configured uplink resources occurs after a successful completion of the re-establishment procedure to the target cell.
  • the pre-configured uplink resources are not available for the re-establishment procedure.
  • the pre-configured uplink resources may have been allocated too far in the future.
  • the first apparatus 110 may perform a random-access as a fallback procedure for a connection setup to the target cell. As such, a failure of the re-establishment procedure due to lack of the pre-configured uplink resources can be avoided.
  • FIG. 3B illustrates an example of RACH-less RRC re-establishment procedure according to some example embodiments of the present disclosure.
  • the first apparatus 110 is also referred to as a UE
  • the second apparatus 120 is also referred to as NW or network or network device.
  • the serving cell prior to the serving cell stop time (i.e., t-Service) , the serving cell provisions the UE with PUR resources with reference to the target cell’s SFN timing to trigger re-establishment without RACH access.
  • the serving cell stop time i.e., t-Service
  • PUR is configured for each active UE to be used in Target cell after serving cell’s t-Service once the target cell takes over.
  • the PUR resource can be allocated based on the Cell Radio Network Temporary Identifier (C-RNTI) of each UE i.e., the UE performs a hashing function similar to when it determines the Paging Occasion based on the UE identity (ID) .
  • the SIB indicates a PUR resource parameter commonly to multiple UEs, and each UE may use its C-RNTI to map the common PUR resource parameter to a UE-specific PUR resource.
  • the SIB may indicate a time domain resource offsetA and a frequency domain resource offsetB.
  • NW can indicate single or multiple PUR time/frequency location (s) to ensure multiple UL transmission attempts.
  • the multiple PURs may be provided in non-adjacent time/frequency locations and/or in adjacent time/frequency locations, e.g., some of the multiple PURs may be in adjacent time/frequency locations while some of the multiple PURs may be in non-adjacent time/frequency locations.
  • the non-adjacency in the time domain may be realized by providing the PURs as periodic with a determined periodicity.
  • a periodicity may be assigned to the PUR resources.
  • resource B periodicity + resource A
  • resource C periodicity*2+resource A and so forth
  • the first apparatus 110 does not drop the PUR configuration for the target cell at the time it leaves the serving cell. Instead, the UE may maintain the PUR configuration until it uses the PUR configuration for the re-establishment procedure.
  • the network determines the relevant target cell (s) , optionally the timing advance and optionally the reference signal received power (RSRP) threshold, based on the satellite ephemeris, satellite footprint and UE location/trajectory.
  • s target cell
  • RSRP reference signal received power
  • the configuration may comprise at least one information element for indicating: 1) a timing advance parameter for using the pre- configured uplink resources; and 2) absence of the timing advance parameter. The UE may then perform the re-establishment procedure in the pre-configured uplink resources by using the indication of the at least one information element.
  • the UE may use the TA in uplink transmissions of the re-establishment procedure. If the at least one information element indicates the absence of the TA, the UE may use only the UE location and satellite assistance information in the uplink transmissions of the re-establishment procedure.
  • the timing advance may be marked to be 0 (as part of the PUR configuration) if the target cell is on the same satellite as the serving cell (e.g., in case of EMC) , which will allow the UE to reuse the current serving cell TA towards the target cell. It is to be understood that the timing advance may also be marked to be any other specific value to indicate it is the same satellite.
  • UE Upon t-Service, UE declares RLF, stops T310 and starts cell selection procedure (i.e., starts T311) .
  • Cell measurements may be conducted prior to t-Service to speed-up the cell selection.
  • the PUR-config contains a new flag or another information element (e.g., physical cell identity (PCI) of the target cell with a carrier frequency, if need) to indicate this single target cell.
  • PCI physical cell identity
  • UE finds suitable cell, conducts DL synchronization, and waits for PUR occasion to occur (if necessary) .
  • UE attempts UL transmission of RRC Re-establishment Request using PUR configuration.
  • PUR configuration Upon the successful completion of the RRC Re-establishment procedure, UE drops any PUR configuration it may have for other target cells.
  • RACH load for RRC Re-establishment can be avoided. Meanwhile, service interruption time after RLF declaration can be reduced and cell selection for Re-establishment procedure can be optimized. Furthermore, UE energy consumption is reduced, and PUR-config is used for a target cell.
  • FIG. 4 illustrates a further signaling chart 400 for provisioning preconfigured resource for target cell in NTN according to some example embodiments of the present disclosure.
  • the signaling exchange between UE and network for the PUR provisioning is illustrated.
  • the signaling chart 400 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 (e.g., referred to as UE in the following embodiments) , the second apparatus 120 and the third apparatus 130.
  • the second apparatus 120 transmits (405) a PUR-configuration request to the third apparatus 130.
  • the third apparatus 130 upon receiving (410) the request from the second apparatus 120, performs (415) UE-specific resource allocation. Then the third apparatus 130 transmits (420) a PUR-configuration request acknowledgment (ACK) to the second apparatus 120.
  • the second apparatus 120 receives (425) the PUR-configuration request ACK and thus complete the coordination of the target cell’s UL resources.
  • the second apparatus 120 may transmit (430) configuration of pre-configured uplink resources, for example, via a dedicated RRC message to the first apparatus 110 before t-Service.
  • the first apparatus 110 upon receiving (435) the configuration of the pre-configured uplink resources, may perform the re-establishment procedure without RACH load.
  • the second apparatus 120 and/or the third apparatus 130 may ensure that PUR resources are unique across connected mode UEs.
  • the second apparatus 120 may pick up the UEs that have sufficient GNSS validity duration to make use of the PUR feature.
  • the RRC message may include a new flag to optimize cell re-selection to search/camp onto specific PCI. Together with this new flag, UE can skip the cell selection procedure and attempt re-establishment with only the indicated target cell and on the specific target cell/frequency.
  • the first apparatus 110 may triggers cell (re-) selection by searching (445) for target cell. If the first apparatus 110 is configured with a pre-configured target cell, it may wait for the PUR occasion to send (450) “RRC Re-establishment Request” instead of initiating RACH-based RRC Re-establishment.
  • the third apparatus 130 may then transmit (460) “RRC Re-establishment” message to the first apparatus 110.
  • the first apparatus 110 receives (465) the “RRC Re-establishment” message and transmits (470) “RRC Re-establishment Complete” message when it completes the re-establishment procedure.
  • the third apparatus 130 receives (475) and thus knows that the re-establishment procedure is successfully completed.
  • the PUR location may be from the starting time of new cell’s availability (these resources may be allocated considering the time taken for the first apparatus 110 to do the re-establishment and possible measurements) .
  • the first apparatus 110 falls back to RACH-based RRC Re-establishment.
  • the first apparatus 110 may skip the current specification’s TA validation condition if it is using uplink pre-compensation, but the currently optional RSRP validation condition may still be used.
  • the network may configure a location-based validation condition (e.g., the first apparatus 110 cannot move more than x meters from the last known/reported location) .
  • NW schedules further re-establishment steps similar to legacy RRC Re-establishment procedure. (i.e., the first apparatus 110 monitors common search-space to receive PDCCH in response to PUR) .
  • the target cell 102 may be available before t-Service (potentially according to t-ServiceStart) .
  • the PUR resource may be made available before the t-Service.
  • the PUR resource may thus be available before the t-Service, such that UE can move to the target cell early. This requires the UE is able to measure the target cell in advance.
  • the first apparatus 110 may consider the timing alignment value for transmission using PUR to be valid when TA alignment and RSRP conditions are valid. In order to ensure TA alignment, the first apparatus 110 may have knowledge of target satellite ephemeris and target cell’s common TA.
  • the first apparatus 110 could be required to acquire e.g., neighbor satellite ephemeris in SIB before t-Service.
  • the NW could signal future neighbor satellite information to be applied at epoch time in the future or provide such future satellite information as part of the PUR configuration if the current satellite assistance information expires before the PUR occasion occurs.
  • the first apparatus 110 may acquire satellite ephemeris during cell selection procedure.
  • the time the first apparatus 110 (e.g., a UE) requires detecting, measuring and evaluating a target cell depends on the UE’s Discontinuous reception (DRX) configuration.
  • DRX Discontinuous reception
  • Table 3 shows example measurements for UE category NB1 in intra-frequency cell reselection.
  • different UEs may be able to use PUR resources at different points in time. This also depends on when the target cell can be measured (is it e.g., available before or after t-Service) .
  • the target cell may not be aware of when the UE is ready to use the PUR resource, unless the serving cell provides information on the UE’s DRX configuration as part of the PUR-config request in step 1.
  • the target cell can configure multiple PUR resources according to the different time requirements.
  • FIG. 5 shows a flowchart of an example method 500 implemented at a first device in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 500 will be described from the perspective of the first apparatus 110 in FIG. 1.
  • the first apparatus 110 receives, from a second apparatus 120 and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell.
  • the first apparatus 110 performs, using the pre-configured uplink resources, the re-establishment procedure in the target cell.
  • the pre-configured uplink resources are with respect to a system frame number of the target cell.
  • the method 500 further comprises: receiving the configuration of the pre-configured uplink resources via at least one of: a radio resource control, RRC, signaling, or system information.
  • the method 500 further comprises: receiving the configuration of the pre-configured uplink resources in a system information block; and determining a location of the pre-configured uplink resource from the system information block by using a cell radio network temporary identifier of the first apparatus.
  • the configuration indicates a plurality of non-adjacent time-frequency domain pre-configured uplink resources.
  • the configuration comprises at least one information element for indicating: a timing advance parameter for using the pre-configured uplink resources; or an absence of the timing advance parameter; and wherein the method 500 further comprises: performing the re-establishment procedure in the pre-configured uplink resources by using the indication of the at least one information element.
  • the method 500 further comprises determining a time point for using the pre-configured uplink resources; and based on the determination of the time point, performing a random-access for a connection setup to the target cell. For example, based on a determination of the possibility of the first apparatus assessing when the PUR resources in time should be used, and if these are far in the future (or it is possible to execute before the RACH) , the first apparatus may perform a RACH-based access.
  • the configuration comprises at least one information element indicating that the pre-configured uplink resources are in the target cell and the method 500 further comprises omitting a cell search for other target cells.
  • the pre-configured uplink resources occur after the stop time
  • the method 500 further comprises: keeping the configuration of the pre-configured uplink resources at a time point after the first apparatus has left the serving non-terrestrial network cell.
  • the method 500 further comprises: transmitting, to the target cell, an RRC re-establishment request in the re-establishment procedure by using the pre-configured uplink resources; and receiving, as a response to the RRC re- establishment request, an RRC configuration of the target cell.
  • the method 500 further comprises: dropping the pre-configured uplink resources configured for at least one of the following: one or more candidate cells other than the target cell after a successful completion of the re-establishment procedure to the target cell or the target cell.
  • the first apparatus comprises a terminal device and the second apparatus comprises a network device.
  • FIG. 6 shows a flowchart of an example method 600 implemented at a second device in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 600 will be described from the perspective of the second apparatus 120 in FIG. 1.
  • the second apparatus 120 transmits, to a first apparatus 110 and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell.
  • the method 600 further comprises: determining the pre-configured uplink resources based on a coordination with a third apparatus managing the target cell.
  • the method 600 further comprises: transmitting the configuration to the first apparatus via at least one of: a radio resource control, RRC, signaling, or system information.
  • the pre-configured uplink resources are associated with a system frame number of the target cell.
  • the configuration indicates a plurality of non-adjacent time-frequency domain pre-configured uplink resources.
  • the configuration indicates one or more timing advance parameters for using the pre-configured uplink resources.
  • the configuration comprises at least one information element for indicating: a timing advance parameter for using the pre-configured uplink resources; or an absence of the timing advance parameter.
  • the configuration comprises at least one information element for indicating the first apparatus to omit a cell search for other target cells.
  • the first apparatus comprises a terminal device and the second apparatus comprises a network device.
  • a first apparatus capable of performing any of the method 500 may comprise means for performing the respective operations of the method 500.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the first apparatus may be implemented as or included in the first apparatus 110 in FIG. 1.
  • the first apparatus comprises means for receiving, from a second apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell; and means for performing, using the pre-configured uplink resources, the re-establishment procedure in the target cell.
  • the pre-configured uplink resources are with respect to a system frame number of the target cell.
  • the first apparatus further comprises: means for receiving the configuration of the pre-configured uplink resources via at least one of: a radio resource control, RRC, signaling, or means for system information.
  • the first apparatus further comprises: means for receiving the configuration of the pre-configured uplink resources in a system information block; and means for determining a location of the pre-configured uplink resource from the system information block by using a cell radio network temporary identifier of the first apparatus.
  • the configuration indicates a plurality of non-adjacent time-frequency domain pre-configured uplink resources.
  • the configuration comprises at least one information element for indicating: a timing advance parameter for using the pre- configured uplink resources; or an absence of the timing advance parameter; and the first apparatus further comprises means for performing the re-establishment procedure in the pre-configured uplink resources by using the indication of the at least one information element.
  • the first apparatus further comprises: means for determining a time point for using the pre-configured uplink resources; and means for, based on the determination of the time point, performing a random-access for a connection setup to the target cell. For example, based on a determination of the possibility of the first apparatus assessing when the PUR resources in time should be used, and if these are far in the future (or it is possible to execute before the RACH) , the first apparatus may perform a RACH-based access.
  • the configuration comprises at least one information element indicating that the pre-configured uplink resources are in the target cell and the first apparatus further comprises means for omitting a cell search for other target cells.
  • the pre-configured uplink resources occur after the stop time
  • the first apparatus further comprises: means for keeping the configuration of the pre-configured uplink resources at a time point after the first apparatus has left the serving non-terrestrial network cell.
  • the first apparatus further comprises: means for transmitting, to the target cell, an RRC re-establishment request in the re-establishment procedure by using the pre-configured uplink resources and means for receiving, as a response to the RRC re-establishment request, an RRC configuration of the target cell.
  • the first apparatus further comprises: means for dropping pre-configured uplink resources configured for at least one of the following: one or more candidate cells other than the target cell after a successful completion of the re-establishment procedure to the target cell or the target cell.
  • the first apparatus comprises a terminal device and the second apparatus comprises a network device.
  • the first apparatus further comprises means for performing other operations in some example embodiments of the method 500 or the first apparatus 110.
  • the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the first apparatus.
  • a second apparatus capable of performing any of the method 600 may comprise means for performing the respective operations of the method 600.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the second apparatus may be implemented as or included in the second apparatus 120 in FIG. 1.
  • the second apparatus comprises means for transmitting, to a first apparatus and before a stop time indicating when a non-terrestrial network cell stops serving the first apparatus, a configuration of pre-configured uplink resources for a connection re-establishment procedure of the first apparatus in a target cell.
  • the second apparatus further comprises: means for determining the pre-configured uplink resources based on a coordination with a third apparatus managing the target cell.
  • the second apparatus further comprises: means for transmitting the configuration to the first apparatus via at least one of: a radio resource control, RRC, signaling, or means for system information.
  • the pre-configured uplink resources are associated with a system frame number of the target cell.
  • the configuration indicates a plurality of non-adjacent time-frequency domain pre-configured uplink resources.
  • the configuration indicates one or more timing advance parameters for using the pre-configured uplink resources.
  • the configuration comprises at least one information element for indicating: a timing advance parameter for using the pre-configured uplink resources; or an absence of the timing advance parameter.
  • the configuration comprises at least one information element for indicating the first apparatus to omit a cell search for other target cells.
  • the first apparatus comprises a terminal device and the second apparatus comprises a network device.
  • the second apparatus further comprises means for performing other operations in some example embodiments of the method 600 or the second apparatus 120.
  • the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the second apparatus.
  • FIG. 7 is a simplified block diagram of a device 700 that is suitable for implementing example embodiments of the present disclosure.
  • the device 700 may be provided to implement a communication device, for example, the first apparatus 110 or the second apparatus 120 as shown in FIG. 1.
  • the device 700 includes one or more processors 710, one or more memories 720 coupled to the processor 710, and one or more communication modules 740 coupled to the processor 710.
  • the communication module 740 is for bidirectional communications.
  • the communication module 740 has one or more communication interfaces to facilitate communication with one or more other modules or devices.
  • the communication interfaces may represent any interface that is necessary for communication with other network elements.
  • the communication module 740 may include at least one antenna.
  • the processor 710 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 700 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.
  • the memory 720 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 724, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , an optical disk, a laser disk, and other magnetic storage and/or optical storage.
  • Examples of the volatile memories include, but are not limited to, a random access memory (RAM) 722 and other volatile memories that will not last in the power-down duration.
  • a computer program 730 includes computer executable instructions that are executed by the associated processor 710.
  • the instructions of the program 730 may include instructions for performing operations/acts of some example embodiments of the present disclosure.
  • the program 730 may be stored in the memory, e.g., the ROM 724.
  • the processor 710 may perform any suitable actions and processing by loading the program 730 into the RAM 722.
  • the example embodiments of the present disclosure may be implemented by means of the program 730 so that the device 700 may perform any process of the disclosure as discussed with reference to FIG. 3 to FIG. 6.
  • the example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 730 may be tangibly contained in a computer readable medium which may be included in the device 700 (such as in the memory 720) or other storage devices that are accessible by the device 700.
  • the device 700 may load the program 730 from the computer readable medium to the RAM 722 for execution.
  • the computer readable medium may include any types of non-transitory storage medium, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • 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) .
  • FIG. 8 shows an example of the computer readable medium 800 which may be in form of CD, DVD or other optical storage disk.
  • the computer readable medium 800 has the program 730 stored thereon.
  • 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, and other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. Although 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.
  • Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods as described above.
  • 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.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages.
  • the program code 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 code, 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.
  • the computer program code 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.
  • 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.

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Abstract

Des modes de réalisation de la présente divulgation concernent des appareils, des procédés et des supports de stockage lisibles par ordinateur pour fournir une ressource préconfigurée pour une cellule cible dans un NTN. Avant un instant d'arrêt indiquant le moment où une cellule de réseau non terrestre cesse de desservir le premier appareil, un premier appareil reçoit d'un second appareil et une configuration de ressources de liaison montante préconfigurées pour une procédure de rétablissement de connexion du premier appareil dans une cellule cible. Le premier appareil effectue la procédure de rétablissement dans la cellule cible à l'aide des ressources de liaison montante préconfigurées. De cette manière, la charge du RACH dans la procédure de rétablissement est évitée et une économie d'énergie peut être obtenue.
PCT/CN2023/130313 2023-11-07 2023-11-07 Fourniture de ressource préconfigurée pour une cellule cible dans un réseau non terrestre Pending WO2025097319A1 (fr)

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WO2023186740A1 (fr) * 2022-03-28 2023-10-05 Panasonic Intellectual Property Corporation Of America Radiomessagerie pour transmission de petites données (sdt) à terminaison mobile (mt)
US20230344508A1 (en) * 2020-01-06 2023-10-26 FG Innovation Company Limited Method of non-terrestrial network assistance information update procedure and related device

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US20220295480A1 (en) * 2019-08-09 2022-09-15 Datang Mobile Communications Equipment Co., Ltd. Uplink resource configuration method, network device, and user equipment
US20230344508A1 (en) * 2020-01-06 2023-10-26 FG Innovation Company Limited Method of non-terrestrial network assistance information update procedure and related device
US20230107526A1 (en) * 2020-07-22 2023-04-06 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Handover method, terminal device, and network device
US20220232503A1 (en) * 2021-01-15 2022-07-21 FG Innovation Company Limited Method of channel scheduling for narrowband internet of things in non-terrestrial network and user equipment using the same
WO2023186740A1 (fr) * 2022-03-28 2023-10-05 Panasonic Intellectual Property Corporation Of America Radiomessagerie pour transmission de petites données (sdt) à terminaison mobile (mt)

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