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WO2025098251A1 - Procédés d'amélioration de commutation de satellite pour réseau non terrestre dans des communications sans fil - Google Patents

Procédés d'amélioration de commutation de satellite pour réseau non terrestre dans des communications sans fil Download PDF

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Publication number
WO2025098251A1
WO2025098251A1 PCT/CN2024/129248 CN2024129248W WO2025098251A1 WO 2025098251 A1 WO2025098251 A1 WO 2025098251A1 CN 2024129248 W CN2024129248 W CN 2024129248W WO 2025098251 A1 WO2025098251 A1 WO 2025098251A1
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WIPO (PCT)
Prior art keywords
satellite
antenna
steering
processor
duration
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PCT/CN2024/129248
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English (en)
Inventor
Abdelkader Medles
Gilles Charbit
Hsuan-Li Lin
Chun-Chia Chen
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MediaTek Inc
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MediaTek Inc
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources

Definitions

  • the present disclosure is generally related to wireless communications and, more particularly, to satellite switching enhancement for non-terrestrial network (NTN) with respect to user equipment (UE) and network node in wireless communications.
  • NTN non-terrestrial network
  • UE user equipment
  • network node in wireless communications.
  • NTN is introduced as a terminal-satellite direct communication technology based on the new radio (NR) interface.
  • NR new radio
  • NTN may provide ubiquitous coverage without being restricted by terrain and landform.
  • IoT Internet-of-Things
  • NR New Radio
  • IoT NTN focuses on satellite IoT services that support low-complexity enhanced machine-type communication (eMTC) and narrowband Internet-of-things (NB-IoT) UEs.
  • eMTC enhanced machine-type communication
  • NB-IoT narrowband Internet-of-things
  • NR NTN uses the 5G NR framework to enable direct connection between satellites and smartphones to provide voice and data services.
  • a UE may need to perform handover (e.g., from a source satellite to a target satellite) , so as to ensure normal transmission/reception during a long connection time and to avoid radio link failure.
  • handover e.g., from a source satellite to a target satellite
  • PCI physical cell identifier
  • a large antenna or a large phase array at the UE side may be required to close the link budget and this type of UE may be referred to as a VSAT UE.
  • a VSAT UE needs to re-steer the VSAT antenna towards the target satellite to prepare for satellite switching and this may induce a significant delay in seconds or even tens of seconds.
  • the satellite switching mechanism is designed without taking the re-steering delay into account. Consequently, the physical random access channel (PRACH) resources for the UE’s initial access at the target satellite will be reserved for longer time.
  • PRACH physical random access channel
  • One objective of the present disclosure is proposing schemes, concepts, designs, systems, methods and apparatus pertaining to satellite switching enhancement for NTN in wireless communications. It is believed that the above-described issues would be avoided or otherwise alleviated by implementing one or more of the proposed schemes described herein.
  • a method may involve an apparatus reporting UE capability information to a network node, wherein the network node is associated with a first satellite and a second satellite.
  • the method may also involve the apparatus receiving a satellite switching indication from the first satellite, wherein the satellite switching indication indicates a satellite switching from the first satellite to the second satellite.
  • the method may further involve the apparatus re-steering an antenna towards the second satellite within an antenna re-steering duration.
  • the method may further involve the apparatus performing the satellite switching after the antenna re-steering duration.
  • a method may involve a network node receiving UE capability information from an apparatus, wherein the network node is associated with a first satellite and a second satellite. The method may also involve the network node transmitting a satellite switching indication to the apparatus via the first satellite according to the UE capability information, wherein the satellite switching indication indicates a satellite switching from the first satellite to the second satellite.
  • LTE Long-Term Evolution
  • LTE-Advanced Long-Term Evolution-Advanced
  • LTE-Advanced Pro 5th Generation
  • NR New Radio
  • IoT Internet-of-Things
  • NB-IoT Narrow Band Internet of Things
  • IIoT Industrial Internet of Things
  • B5G beyond 5G
  • 6G 6th Generation
  • the proposed concepts, schemes and any variation (s) /derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies.
  • the scope of the present disclosure is not limited to the examples described herein.
  • FIG. 1 is a diagram depicting an example scenario of hard satellite switching in accordance with the present disclosure.
  • FIG. 2 is a diagram depicting an example scenario of soft satellite switching in accordance with the present disclosure.
  • FIG. 3 is a diagram depicting an example scenario of a VSAT UE undergoing a satellite switching in accordance with the present disclosure.
  • FIG. 4 is a diagram depicting an example scenario of a communication environment in which various solutions and schemes in accordance with the present disclosure may be implemented.
  • FIG. 5 is a diagram depicting an example scenario of an enhanced satellite switching procedure for NTN in accordance with an implementation of the present disclosure.
  • FIG. 6 is a diagram depicting an example scenario of an enhanced satellite switching procedure for NTN in accordance with another implementation of the present disclosure.
  • FIG. 7 is a block diagram of an example communication system in accordance with an implementation of the present disclosure.
  • FIG. 8 is a flowchart of an example process in accordance with an implementation of the present disclosure.
  • FIG. 9 is a flowchart of another example process in accordance with an implementation of the present disclosure.
  • Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and/or solutions pertaining to satellite switching enhancement for NTN in wireless communications.
  • a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
  • NTN refers to a network that uses radio frequency (RF) and information processing resources carried on high, medium and low orbit satellites or other high-altitude communication platforms to provide communication services for UEs.
  • RF radio frequency
  • the satellite According to the load capacity on the satellite, there are two typical scenarios, namely: transparent payload and regenerative payload.
  • transparent payload mode the satellite does not process the signal and waveform in the communication service but, rather, only functions as an RF amplifier to forward data.
  • regenerative payload mode the satellite, other than RF amplification, also has the processing capabilities of modulation/demodulation, coding/decoding, switching, routing and so on. It is noteworthy that the present disclosure is motivated by, but not limited to, an NTN scenario.
  • FIG. 1 illustrates an example scenario 100 of hard satellite switching in accordance with the present disclosure. As shown in FIG.
  • FIG. 2 illustrates an example scenario 200 of soft satellite switching in accordance with the present disclosure. Scenario 200 is similar to scenario 100, except that in the time gap between time T1 and time T2, the area is covered by both satellite 1 and satellite 2, such that connection remains available during the satellite switching.
  • FIG. 3 illustrates an example scenario 300 of a VSAT UE undergoing a satellite switching in accordance with the present disclosure.
  • Scenario 300 involves a VSAT UE in wireless communication with satellite 1 (denoted as SAT#1) initially.
  • the VSAT UE will need to perform a satellite switching to switch the communication link from satellite 1 to satellite 2. Accordingly, before performing the satellite switching, the VSAT UE needs to re-steer its VSAT antenna towards satellite 2 with a re-steering delay.
  • the current satellite switching mechanism is designed without taking the re-steering delay into account. Consequently, the PRACH resources for the UE’s initial access at the target satellite will be reserved for longer time. Moreover, since the satellite switching related timers are not adapted for VSAT UE scenarios, the UE operations during the satellite switching may not work correctly (e.g., the UE may not have enough time to complete the satellite switching) .
  • FIG. 4 illustrates an example scenario 400 of a communication environment in which various solutions and schemes in accordance with the present disclosure may be implemented.
  • Scenario 400 involves a UE 410 (e.g., a VSAT UE) in wireless communication with a network 420 (e.g., a wireless network including an NTN and a TN) via at least one terrestrial network node 421 (e.g., a base station (BS) such as an evolved Node-B (eNB) , a gNB, or a transmission/reception point (TRP) ) and one or more non-terrestrial network nodes 422-423 (e.g., satellite (s) ) .
  • BS base station
  • eNB evolved Node-B
  • TRP transmission/reception point
  • the terrestrial network node 421 and each of the non-terrestrial network nodes 422-423 may form an NTN serving cell (e.g., the same cell with the same PCI) for wireless communication with the UE 410.
  • the terrestrial network node 421 and the non-terrestrial network node 422/423 may communicate through an NTN or satellite gateway (not shown) .
  • the UE 410, the terrestrial network node 421, and the non-terrestrial network nodes 422-423 may implement various schemes pertaining to satellite switching enhancement for NTN in wireless communications in accordance with the present disclosure, as described below. It is noteworthy that, while the various proposed schemes may be individually or separately described below, in actual implementations some or all of the proposed schemes may be utilized or otherwise implemented jointly. Of course, each of the proposed schemes may be utilized or otherwise implemented individually or separately.
  • a VSAT UE may report VSAT UE capability information to a network node (e.g., the network node associated with the source satellite and the target satellite) .
  • the VSAT UE capability information includes information that allows the network node to know how long it would take to steer the VSAT antenna from the source satellite to the target satellite, such that the network node may transmit the satellite switching indication according to the VSAT UE capability information.
  • the VSAT UE may re-steer the VSAT antenna towards the target satellite within a VSAT antenna re-steering duration, and then perform the satellite switching after the VSAT antenna re-steering duration.
  • the VSAT UE capability information may include at least a VSAT antenna type indicating whether the VSAT UE uses electronic or mechanical steering antenna. Additionally, or optionally, the VSAT UE capability information may include a capability of receiving from more than one satellite at a same time (while using multiple UE beams or multiple VSAT antenna or phase array antennas) , and/or a capability of maintaining a link with the source satellite during the VSAT antenna re-steering duration (e.g., for electronic steering antenna) .
  • the VSAT UE may report the VSAT UE capability information during a UE capability transfer procedure. The capability transfer procedure may be initiated by a UECapabilityEnquiry message from the network node. Upon receiving the UECapabilityEnquiry message, the VSAT UE may reply to the network node with a UECapabilityInformation message including the VSAT UE capability information.
  • the VSAT UE capability information may include a parameter related to the VSAT antenna re-steering duration.
  • the parameter may indicate a rotor speed, e.g., in degrees per second, and the network node may use the approximate UE position and the source and target satellite positions to calculate the VSAT antenna re-steering duration.
  • the parameter may indicate a value of the VSAT antenna re-steering duration, e.g., the UE may calculate the VSAT antenna re-steering duration using the source and target satellite positions and report the calculated duration plus some additional margin (depending on other overheads) to the network node.
  • option 2 may be applicable as the steering may take time in terms of preparation and to take effect.
  • the parameter may indicate at least one of the following: (i) a VSAT antenna re-steering time level, e.g., long, medium, or short; (ii) a minimum VSAT antenna re-steering time (e.g., for a predefined re-steering angle) ; and (iii) a maximum VSAT antenna re-steering time (e.g., for a predefined re-steering angle) .
  • the VSAT UE may report the parameter related to the VSAT antenna re-steering duration according to network’s request.
  • the network node may transmit a request message including assistance information to the VSAT UE.
  • the assistance information may include ephemeris information, an epoch time, and a start service time of the target satellite, such that the VSAT UE may estimate/determine a value of the VSAT antenna re-steering duration based on the assistant information.
  • the VSAT UE may respond to the request message by reporting the estimated value to the network node.
  • a new timer (e.g., called Resteering_timer or offset timer) may be introduced to handle the VSAT antenna re-steering duration.
  • the new timer may be triggered at the start of the satellite switching procedure at the UE side (e.g., the new timer is started upon receiving a satellite switching indication) , and the UE will not perform initial access (e.g., PRACH transmission) to the target satellite until the new timer expires.
  • the start of the satellite switching timer at the UE side may be delayed until the new timer expires.
  • the value of the new timer may be determined by the network node and signaled to the UE, or determined by the UE and signaled to the network node.
  • the value of the new timer may be determined based on a predetermined table (e.g., defined in 3GPP standards) at both the BS side and UE side (e.g., both BS and UE may pick the same value according to the predetermined table) .
  • a predetermined table e.g., defined in 3GPP standards
  • FIG. 5 illustrates an example scenario 500 of an enhanced satellite switching procedure for NTN in accordance with an implementation of the present disclosure.
  • the VSAT UE may receive, via the source satellite (denoted as SAT#1) , a satellite switching indication from the network node associated with the source satellite and the target satellite (denoted as SAT#2) . That is, both the source satellite and the target satellite are associated with the same PCI.
  • the VSAT UE may start the re-steering timer (denoted as T re-steering ) with an offset value upon receiving the satellite switching indication.
  • the offset value may be included in the satellite switching indication.
  • the VSAT UE may set the offset value to the reported value of the VSAT antenna re-steering duration.
  • the VSAT UE may re-steer the VSAT antenna towards the target satellite.
  • the VSAT UE may perform downlink (DL) synchronization with the target satellite once the VSAT antenna is re-steered to point to the target satellite.
  • the VSAT UE may start a satellite switching timer (e.g., a control timer C_T for governing the satellite switching procedure) .
  • the VSAT UE may perform the satellite switching procedure (e.g., including a random access procedure) .
  • the PRACH resources e.g., random access preambles
  • the PRACH resources for the UE’s satellite switching may be reserved according to the offset value.
  • the PRACH resources for the UE’s satellite switching may be reserved from the time ⁇ t1+offset ⁇ to the time ⁇ t1+offset+C_T ⁇ .
  • FIG. 6 illustrates an example scenario 600 of an enhanced satellite switching procedure for NTN in accordance with another implementation of the present disclosure.
  • the VSAT UE may receive, via the source satellite (denoted as SAT#1) , a UECapabilityEnquiry message from the network node associated with the source satellite and the target satellite (denoted as SAT#2) . That is, both the source satellite and the target satellite are associated with the same PCI.
  • the VSAT UE may transmit a UECapabilityInformation message including the VSAT UE capability information to the network node via the source satellite.
  • the VSAT UE may receive a satellite switching indication including a prolonged satellite switching timer value from the network node via the source satellite.
  • the VSAT UE may start the satellite switching timer (denoted as C_T) with the prolonged satellite switching timer value upon receiving the satellite switching indication.
  • the VSAT UE may re-steer the VSAT antenna towards the target satellite (denoted as SAT#2) .
  • the VSAT UE may perform DL synchronization with the target satellite once the VSAT antenna is re-steered to point to the target satellite.
  • the VSAT UE may perform the satellite switching procedure (e.g., including a random access procedure) . It is noteworthy that the satellite switching timer value is prolonged to cover the UE’s re-steering time, such that the VSAT UE may have enough time to complete the satellite switching procedure after the antenna re-steering operations.
  • the satellite switching indication may be a SatSwitchWithReSync-r18 information element (IE) included in a system information block type 19 (SIB19) , wherein the SatSwitchWithReSync-r18 IE includes ephemeris information (e.g., an NTN-Config IE) and timing advance (TA) common parameters of the target satellite (e.g., ‘t-ServiceStart’ indicating the service start time of the target satellite, and ‘ssb-TimeOffset’ indicating the synchronization signal block (SSB) time offset between the source and target satellites) .
  • ephemeris information e.g., an NTN-Config IE
  • TA timing advance
  • the VSAT UE may perform a SIB re-acquisition for ephemeris information and TA common parameters of the target satellite if an uplink (UL) synchronization timer (e.g., T430) associated with the target satellite expires during the VSAT antenna re-steering duration.
  • UL uplink
  • FIG. 7 illustrates an example communication system 700 having an example communication apparatus 710 and an example network apparatus 720 in accordance with an implementation of the present disclosure.
  • Each of communication apparatus 710 and network apparatus 720 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to satellite switching enhancement for NTN in wireless communications, including scenarios/schemes described above as well as processes 800 and 900 described below.
  • Communication apparatus 710 may be a part of an electronic apparatus, which may be a VSAT UE such as a wireless communication apparatus or a computing apparatus, which may be mounted on a ship or vehicle, or installed on the roof a building (e.g., home or office) , to provide internet access through satellite communications.
  • communication apparatus 710 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set-computing (CISC) processors.
  • IC integrated-circuit
  • RISC reduced-instruction set computing
  • CISC complex-instruction-set-computing
  • Communication apparatus 710 such as a processor 712, for example.
  • Communication apparatus 710 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and/or user interface device) , and, thus, such component (s) of communication apparatus 710 are neither shown in FIG. 7 nor described below in the interest of simplicity and brevity.
  • Network apparatus 720 may be a part of an electronic apparatus, which may be a network node such as a satellite, a BS, a small cell, a router or a gateway of an NTN.
  • network apparatus 720 may be implemented in a satellite and/or an eNB/gNB/TRP in a 4G/5G, NR, IoT, NB-IoT or IIoT network.
  • network apparatus 720 may be implemented in the form of one or more IC chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, or one or more RISC or CISC processors.
  • Network apparatus 720 may include at least some of those components shown in FIG. 7 such as a processor 722, for example.
  • Network apparatus 720 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and/or user interface device) , and, thus, such component (s) of network apparatus 720 are neither shown in FIG. 7 nor described below in the interest of simplicity and brevity.
  • components not pertinent to the proposed scheme of the present disclosure e.g., internal power supply, display device and/or user interface device
  • each of processor 712 and processor 722 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though a singular term “a processor” is used herein to refer to processor 712 and processor 722, each of processor 712 and processor 722 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure.
  • each of processor 712 and processor 722 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and/or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure.
  • each of processor 712 and processor 722 is a special-purpose machine specifically designed, arranged and configured to perform specific tasks, including satellite switching enhancement for NTN, in a device (e.g., as represented by communication apparatus 710) and a network node (e.g., as represented by network apparatus 720) in accordance with various implementations of the present disclosure.
  • communication apparatus 710 may also include a transceiver 716 coupled to processor 712 and capable of wirelessly transmitting and receiving data.
  • transceiver 716 may be capable of wirelessly communicating with different types of UEs and/or wireless networks of different radio access technologies (RATs) .
  • RATs radio access technologies
  • transceiver 716 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, transceiver 716 may be equipped with multiple transmit antennas and multiple receive antennas for multiple-input multiple-output (MIMO) wireless communications.
  • MIMO multiple-input multiple-output
  • transceiver 716 may be equipped with a rotor if mechanical steering antenna is used.
  • transceiver 716 may be equipped with phase antenna (s) if electronic steering antenna is used.
  • network apparatus 720 may also include a transceiver 726 coupled to processor 722.
  • Transceiver 726 may include a transceiver capable of wirelessly transmitting and receiving data.
  • transceiver 726 may be capable of wirelessly communicating with different types of UEs of different RATs.
  • transceiver 726 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, transceiver 726 may be equipped with multiple transmit antennas and multiple receive antennas for MIMO wireless communications.
  • communication apparatus 710 may further include a memory 714 coupled to processor 712 and capable of being accessed by processor 712 and storing data therein.
  • network apparatus 720 may further include a memory 724 coupled to processor 722 and capable of being accessed by processor 722 and storing data therein.
  • RAM random-access memory
  • DRAM dynamic RAM
  • SRAM static RAM
  • T-RAM thyristor RAM
  • Z-RAM zero-capacitor RAM
  • each of memory 714 and memory 724 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and/or electrically erasable programmable ROM (EEPROM) .
  • ROM read-only memory
  • PROM programmable ROM
  • EPROM erasable programmable ROM
  • EEPROM electrically erasable programmable ROM
  • each of memory 714 and memory 724 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and/or phase-change memory.
  • NVRAM non-volatile random-access memory
  • Each of communication apparatus 710 and network apparatus 720 may be a communication entity capable of communicating with each other using various proposed schemes in accordance with the present disclosure.
  • a description of capabilities of communication apparatus 710, as a UE, and network apparatus 720, as a network node (e.g., satellite) is provided below with processes 800 and 900.
  • FIG. 8 illustrates an example process 800 in accordance with an implementation of the present disclosure.
  • Process 800 may be an example implementation of above scenarios/schemes, whether partially or completely, with respect to satellite switching enhancement for NTN in wireless communications.
  • Process 800 may represent an aspect of implementation of features of communication apparatus 710.
  • Process 800 may include one or more operations, actions, or functions as illustrated by one or more of blocks 810 to 840. Although illustrated as discrete blocks, various blocks of process 800 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 800 may be executed in the order shown in FIG. 8 or, alternatively, in a different order.
  • Process 800 may be implemented by or in communication apparatus 710 or any suitable UE. Solely for illustrative purposes and without limitation, process 800 is described below in the context of communication apparatus 710. Process 800 may begin at block 810.
  • process 800 may involve processor 712 of communication apparatus 710 reporting, via transceiver 716, UE capability information to a network node (e.g., network apparatus 720) , wherein the network node is associated with a first satellite and a second satellite.
  • a network node e.g., network apparatus 720
  • Process 800 may proceed from 810 to 820.
  • process 800 may involve processor 712 receiving, via transceiver 716, a satellite switching indication from the first satellite, wherein the satellite switching indication indicates a satellite switching from the first satellite to the second satellite.
  • Process 800 may proceed from 820 to 830.
  • process 800 may involve processor 712 re-steering an antenna towards the second satellite within an antenna re-steering duration.
  • Process 800 may proceed from 830 to 840.
  • the UE capability information may include at least one of the following: (i) an antenna type indicating whether a UE uses electronic or mechanical steering antenna; (ii) a capability of receiving from more than one satellite at a same time; and (iii) a capability of maintaining a link with the first satellite during the antenna re-steering duration.
  • the UE capability information may include a parameter related to the antenna re-steering duration, and the parameter may indicate at least one of the following: (i) a rotor speed; (ii) a value of the antenna re-steering duration; (iii) an antenna re-steering time level; (iv) a minimum antenna re-steering time; and (v) a maximum antenna re-steering time.
  • process 800 may further involve processor 712 starting a re-steering timer with a value of the antenna re-steering duration upon receiving the satellite switching indication, and starting a satellite switching timer at a start of performing the satellite switching in an event that the re-steering timer expires.
  • the satellite switching indication may include the value of the antenna re-steering duration.
  • process 800 may further involve processor 712 receiving, via transceiver 716, assistance information from the network node, wherein the assistance information comprises ephemeris information, an epoch time, and a start service time of the second satellite. Additionally, process 800 may further involve processor 712 determining a value of the antenna re-steering duration based on the assistance information.
  • the assistance information may be received in a request message, and the value of the antenna re-steering duration may be reported to the network node responsive to the request message.
  • process 800 may further involve processor 712 starting a satellite switching timer upon receiving the satellite switching indication, wherein the satellite switching timer is configured with a value larger than that of the antenna re-steering duration.
  • process 800 may further involve processor 712 performing, via transceiver 716, a SIB re-acquisition for ephemeris information and TA common parameters of the second satellite in an event that an UL synchronization timer associated with the second satellite expires during the antenna re-steering duration.
  • the satellite switching indication may be received in a SIB (e.g., SIB19) .
  • FIG. 9 illustrates an example process 900 in accordance with an implementation of the present disclosure.
  • Process 900 may be an example implementation of above scenarios/schemes, whether partially or completely, with respect to satellite switching enhancement for NTN in wireless communications.
  • Process 900 may represent an aspect of implementation of features of network apparatus 720.
  • Process 900 may include one or more operations, actions, or functions as illustrated by one or more of blocks 910 and 920. Although illustrated as discrete blocks, various blocks of process 900 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 900 may be executed in the order shown in FIG. 9 or, alternatively, in a different order.
  • Process 900 may be implemented by or in network apparatus 720 as well as any variations thereof. Solely for illustrative purposes and without limitation, process 900 is described below in the context of network apparatus 720.
  • Process 900 may begin at block 910.
  • process 900 may involve processor 722 of network apparatus 720 receiving, via transceiver 726, UE capability information from an apparatus (e.g., communication apparatus 710) , wherein network apparatus 720 is associated with a first satellite and a second satellite.
  • Process 900 may proceed from block 910 to block 920.
  • process 900 may involve processor 722 transmitting, via transceiver 726, a satellite switching indication to the apparatus via the first satellite according to the UE capability information, wherein the satellite switching indication indicates a satellite switching from the first satellite to the second satellite.
  • the UE capability information may include at least one of the following: (i) an antenna type indicating whether a UE uses electronic or mechanical steering antenna; (ii) a capability of receiving from more than one satellite at a same time; and (iii) a capability of maintaining a link with the first satellite during the antenna re-steering duration.
  • the UE capability information may include a parameter related to the antenna re-steering duration, and the parameter may indicate at least one of the following: (i) a rotor speed; (ii) a value of the antenna re-steering duration; (iii) an antenna re-steering time level; (iv) a minimum antenna re-steering time; and (v) a maximum antenna re-steering time.
  • the antenna re-steering duration allows the apparatus to re-steer an antenna towards the second satellite before performing the satellite switching.
  • the satellite switching indication may include a value of the antenna re-steering duration.
  • process 900 may further involve processor 722 transmitting, via transceiver 726, assistance information to the apparatus, wherein the assistance information comprises ephemeris information, an epoch time, and a start service time of the second satellite, such that the apparatus determines a value of the antenna re-steering duration based on the assistance information.
  • assistance information comprises ephemeris information, an epoch time, and a start service time of the second satellite, such that the apparatus determines a value of the antenna re-steering duration based on the assistance information.
  • the assistance information may be transmitted in a request message, and the value of the antenna re-steering duration may be received from the apparatus responsive to the request message.
  • the satellite switching indication may include a satellite switching timer configured with a value larger than that of the antenna re-steering duration.
  • the satellite switching indication may include ephemeris information and TA common parameters of the second satellite.
  • the satellite switching indication may be received in a SIB (e.g., SIB19) .
  • any two components so associated can also be viewed as being “operably connected” , or “operably coupled” , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being “operably couplable” , to each other to achieve the desired functionality.
  • operably couplable include but are not limited to physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention concerne diverses solutions de commutation de satellite pour un réseau non terrestre (NTN) dans des communications sans fil. Un appareil peut rapporter des informations de capacité d'équipement utilisateur (UE) à un nœud de réseau associé à un premier satellite et à un second satellite. Ensuite, l'appareil peut recevoir une indication de commutation de satellite provenant du premier satellite. L'indication de commutation de satellite indique une commutation de satellite du premier satellite au second satellite. L'appareil peut également réorienter une antenne vers le second satellite dans un délai de réorientation d'antenne, puis effectuer la commutation de satellite après le délai de réorientation de l'antenne.
PCT/CN2024/129248 2023-11-10 2024-11-01 Procédés d'amélioration de commutation de satellite pour réseau non terrestre dans des communications sans fil Pending WO2025098251A1 (fr)

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US63/597725 2023-11-10

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210250816A1 (en) * 2020-02-07 2021-08-12 Qualcomm Incorporated Handover mechanism for non-terrestrial network (ntn) system in 5g new radio (nr)
CN116134902A (zh) * 2020-08-06 2023-05-16 高通股份有限公司 在固定无线电小区中切换卫星
US20230208512A1 (en) * 2021-12-29 2023-06-29 Hughes Network Systems, Llc Systems and methods to minimize handover interruption time

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210250816A1 (en) * 2020-02-07 2021-08-12 Qualcomm Incorporated Handover mechanism for non-terrestrial network (ntn) system in 5g new radio (nr)
CN116134902A (zh) * 2020-08-06 2023-05-16 高通股份有限公司 在固定无线电小区中切换卫星
US20230208512A1 (en) * 2021-12-29 2023-06-29 Hughes Network Systems, Llc Systems and methods to minimize handover interruption time

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