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WO2023111619A1 - Appareil et procédé de communication sans fil - Google Patents

Appareil et procédé de communication sans fil Download PDF

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Publication number
WO2023111619A1
WO2023111619A1 PCT/IB2021/000938 IB2021000938W WO2023111619A1 WO 2023111619 A1 WO2023111619 A1 WO 2023111619A1 IB 2021000938 W IB2021000938 W IB 2021000938W WO 2023111619 A1 WO2023111619 A1 WO 2023111619A1
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WO
WIPO (PCT)
Prior art keywords
target cell
serving cell
cell
handover
present disclosure
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.)
Ceased
Application number
PCT/IB2021/000938
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English (en)
Inventor
Hao Lin
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.)
Orope France SARL
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Orope France SARL
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 Orope France SARL filed Critical Orope France SARL
Priority to PCT/IB2021/000938 priority Critical patent/WO2023111619A1/fr
Publication of WO2023111619A1 publication Critical patent/WO2023111619A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H04W36/00725—Random access channel [RACH]-less handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/083—Reselecting an access point wherein at least one of the access points is a moving node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Definitions

  • the present disclosure relates to the field of communication systems, and more particularly, to an apparatus and a method of wireless communication, which can provide a good communication performance and/or high reliability.
  • Non-terrestrial networks refer to networks, or segments of networks, using a spacebome vehicle or an airborne vehicle for transmission.
  • Spacebome vehicles include satellites including low earth orbiting (LEO) satellites, medium earth orbiting (MEO) satellites, geostationary earth orbiting (GEO) satellites, and highly elliptical orbiting (HEO) satellites.
  • Airborne vehicles include high altitude platforms (HAPs) encompassing unmanned aircraft systems (UAS) including lighter than air (LTA) unmanned aerial systems (UAS) and heavier than air (HTA) UAS, all operating in altitudes typically between 8 and 50 km, quasi-stationary.
  • HAPs high altitude platforms
  • UAS unmanned aircraft systems
  • LTA lighter than air
  • UAS unmanned aerial systems
  • HTA heavier than air
  • a handover procedure for a user equipment (UE) switching from a serving cell to a target cell requires the UE to perform a random access channel (RACK) procedure. This may increase a handover latency.
  • RACK random access channel
  • An object of the present disclosure is to propose an apparatus (such as a user equipment (UE), a serving cell, and/or a target cell) and a method of wireless communication, which can provide a quick handover latency for non-terrestrial network (NTN) and/or new radio (NR) system, provide a good communication performance, and/or provide high reliability.
  • a method of wireless communication by a user equipment (UE) comprises receiving, from a serving cell, a handover command for a handover procedure for the UE switching from the serving cell to a target cell, transmitting, to the target cell, an uplink transmission according to the handover command, and receiving, from the target cell, a message.
  • the handover command comprises a command for a random access channel-less (RACH-less) handover for the UE switching from the serving cell to the target cell.
  • RACH-less random access channel-less
  • the handover command comprises at least one of following information: an ephemeris data of the target cell; common timing advance (TA) relevant parameters of the target cell; an offset value; a new cell-radio network temporary identifier (C-RNTI); a configuration for one or more physical uplink shared channel (PUSCH) resources of the target cell, or a configuration of a search space.
  • TA timing advance
  • C-RNTI new cell-radio network temporary identifier
  • PUSCH physical uplink shared channel
  • the one or more PUSCH resources comprises one or more configured uplink grants (CUL grants).
  • the UE when the ephemeris data of the target cell is not provided by the serving cell, the UE assumes that the ephemeris data of the target cell is same as an ephemeris data of the serving cell.
  • the UE when the common TA relevant parameters of the target cell are not provided by the serving cell, the UE assumes that the common TA relevant parameters of the target cell are same as common TA relevant parameters of the serving cell, or the UE assumes that a common TA of the target cell is zero.
  • the method further comprises performing synchronization with the target cell.
  • the synchronization uses the ephemeris data of the target cell and/or the common TA relevant parameters of the target cell.
  • the UE after the synchronization is performed by the UE, the UE selects a first available PUSCH resource from the one or more PUSCH resources for uplink transmission.
  • the one or more CUL grants are dynamically scheduled by the target cell.
  • the method further comprises starting to monitor a physical downlink control channel (PDCCH) in the search space.
  • PDCH physical downlink control channel
  • the search space is configured for RACH-less handover.
  • the uplink transmission comprises the new C-RNTI or a TA relevant information of the UE.
  • the message from the target cell comprises the new C-RNTI, a contention resolution identifier (ID), or an acknowledgement.
  • the handover procedure is complete.
  • the acknowledgement is carried by a downlink control information (DCI) and/or the acknowledgement comprises a hybrid automatic repeat request acknowledgment (HARQ-ACK) information.
  • DCI downlink control information
  • HARQ-ACK hybrid automatic repeat request acknowledgment
  • a method of wireless communication by a serving cell comprises transmitting, to a target cell, a handover request for a handover procedure for a user equipment (UE) switching from the serving cell to the target cell, receiving, from the target cell, a response, and transmitting, to the UE, a handover command for the handover procedure for the UE switching from the serving cell to the target cell.
  • UE user equipment
  • the handover request comprises an ID of the UE.
  • the response comprises a new C-RNTI.
  • the handover command comprises a command for a random access channelless (RACH-less) handover for the UE switching from the serving cell to the target cell.
  • the handover command comprises at least one of following information: an ephemeris data of the target cell; common timing advance (TA) relevant parameters of the target cell; an offset value; a new cell-radio network temporary identifier (C-RNTI); a configuration for one or more physical uplink shared channel (PUSCH) resources of the target cell, or a configuration of a search space.
  • TA timing advance
  • C-RNTI new cell-radio network temporary identifier
  • PUSCH physical uplink shared channel
  • the one or more PUSCH resources comprises one or more configured uplink grants (CUL grants).
  • the UE when the ephemeris data of the target cell is not provided by the serving cell, the UE assumes that the ephemeris data of the target cell is same as an ephemeris data of the serving cell.
  • the UE when the common TA relevant parameters of the target cell are not provided by the serving cell, the UE assumes that the common TA relevant parameters of the target cell are same as common TA relevant parameters of the serving cell, or the UE assumes that a common TA of the target cell is zero.
  • the method further comprises controlling the UE to perform synchronization with the target cell.
  • the synchronization uses the ephemeris data of the target cell and/or the common TA relevant parameters of the target cell.
  • the serving cell controls the UE to select a first available PUSCH resource from the one or more PUSCH resources for uplink transmission.
  • the one or more CUL grants are dynamically scheduled by the target cell.
  • the method further comprises controlling the UE to monitor a physical downlink control channel (PDCCH) in the search space.
  • PDCCH physical downlink control channel
  • the search space is configured for RACH-less handover.
  • the uplink transmission comprises the new C-RNTI or a TA relevant information of the UE.
  • the message from the target cell comprises the new C-RNTI, a contention resolution identifier (ID), or an acknowledgement.
  • the handover procedure is complete.
  • the handover procedure is complete.
  • the acknowledgement is carried by a downlink control information (DCI) and/or the acknowledgement comprises a hybrid automatic repeat request acknowledgment (HARQ-ACK) information.
  • DCI downlink control information
  • HARQ-ACK hybrid automatic repeat request acknowledgment
  • a method of wireless communication by a target cell comprises receiving, from a serving cell, a handover request for a handover procedure for a user equipment (UE) switching from the serving cell to the target cell, transmitting, to the serving cell, a response, receiving, from the UE, an uplink transmission relevant to a handover command, and transmitting, to the UE, a message.
  • UE user equipment
  • the handover request comprises an ID of the UE.
  • the response comprises a new C-RNTI.
  • the handover command comprises a command for a random access channelless (RACH-less) handover for the UE switching from the serving cell to the target cell.
  • RACH-less random access channelless
  • the handover command comprises at least one of following information: an ephemeris data of the target cell; common timing advance (TA) relevant parameters of the target cell; an offset value; a new cell-radio network temporary identifier (C-RNTI); a configuration for one or more physical uplink shared channel (PUSCH) resources of the target cell, or a configuration of a search space.
  • TA timing advance
  • C-RNTI new cell-radio network temporary identifier
  • PUSCH physical uplink shared channel
  • the one or more PUSCH resources comprises one or more configured uplink grants (CUL grants).
  • the UE when the ephemeris data of the target cell is not provided by the serving cell, the UE assumes that the ephemeris data of the target cell is same as an ephemeris data of the serving cell.
  • the UE when the common TA relevant parameters of the target cell are not provided by the serving cell, the UE assumes that the common TA relevant parameters of the target cell are same as common TA relevant parameters of the serving cell, or the UE assumes that a common TA of the target cell is zero.
  • the method further comprises controlling the UE to perform synchronization with the target cell.
  • the synchronization uses the ephemeris data of the target cell and/or the common TA relevant parameters of the target cell.
  • the serving cell controls the UE to select a first available PUSCH resource from the one or more PUSCH resources for uplink transmission.
  • the one or more CUL grants are dynamically scheduled by the target cell.
  • the method further comprises controlling the UE to monitor a physical downlink control channel (PDCCH) in the search space.
  • PDCCH physical downlink control channel
  • the search space is configured for RACH-less handover.
  • the uplink transmission comprises the new C-RNTI or a TA relevant information of the UE.
  • the message from the target cell comprises the new C-RNTI, a contention resolution identifier (ID), or an acknowledgement.
  • the handover procedure is complete.
  • the acknowledgement is carried by a downlink control information (DCI) and/or the acknowledgement comprises a hybrid automatic repeat request acknowledgment (HARQ-ACK) information.
  • DCI downlink control information
  • HARQ-ACK hybrid automatic repeat request acknowledgment
  • a user equipment comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the processor is configured to perform the above method.
  • a serving cell comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the processor is configured to perform the above method.
  • a serving cell comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the processor is configured to perform the above method.
  • a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.
  • a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method.
  • a computer readable storage medium in which a computer program is stored, causes a computer to execute the above method.
  • a computer program product includes a computer program, and the computer program causes a computer to execute the above method.
  • a computer program causes a computer to execute the above method.
  • FIG. 1 A is a block diagram of one or more user equipments (UEs), a serving cell, and/or a target cell of communication in a communication network system according to an embodiment of the present disclosure.
  • UEs user equipments
  • serving cell serving cell
  • target cell target cell of communication in a communication network system according to an embodiment of the present disclosure.
  • FIG. IB is a block diagram of one or more user equipments (UEs) and a base station (e.g., gNB or eNB) of communication in a non-terrestrial network (NTN) system according to an embodiment of the present disclosure.
  • UEs user equipments
  • NTN non-terrestrial network
  • FIG. 2 is a flowchart illustrating a method of wireless communication performed by a user equipment (UE) according to an embodiment of the present disclosure.
  • UE user equipment
  • FIG. 3 is a flowchart illustrating a method of wireless communication performed by a serving cell according to an embodiment of the present disclosure.
  • FIG. 4 is a flowchart illustrating a method of wireless communication performed by a target cell according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram illustrating a communication system including a base station (BS) and a UE according to an embodiment of the present disclosure.
  • BS base station
  • UE UE
  • FIG. 6 is a schematic diagram illustrating that a BS transmits 3 beams to the ground forming 3 footprints according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram illustrating an uplink-downlink timing relation according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram illustrating a handover procedure for a UE switching from a serving cell to a target cell according to an embodiment of the present disclosure.
  • FIG. 9 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.
  • FIG. 1A illustrates that, in some embodiments, one or more user equipments (UEs) 10, a serving cell 20 (or called a source cell) (e.g., gNB or eNB), and a target cell 30 (e.g., gNB or eNB) in a communication network system 40 (e.g., non-terrestrial network (NTN) or terrestrial network) according to an embodiment of the present disclosure are provided.
  • the communication network system 40 includes the one or more UEs 10, the serving cell 20, and the target cell 30.
  • the one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13.
  • the serving cell 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23.
  • the target cell 30 may include a memory 32, a transceiver 33, and a processor 31 coupled to the memory 32 and the transceiver 33.
  • the processor 11, 21, or 31 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11, 21, or 31.
  • the memory 12, 22, or 32 is operatively coupled with the processor 11 , 21 , or 31 and stores a variety of information to operate the processor 11, 21, or 31.
  • the transceiver 13, 23, or 33 is operatively coupled with the processor 11, 21, or 31, and the transceiver 13, 23, or 33 transmits and/or receives a radio signal.
  • the processor 11, 21, or 31 may include application-specific integrated circuit (ASIC), other chipset, logic circuit and/or data processing device.
  • the memory 12, 22, or 32 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other storage device.
  • the transceiver 13, 23, or 33 may include baseband circuitry to process radio frequency signals.
  • the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein.
  • the modules can be stored in the memory 12, 22, or 32 and executed by the processor 11, 21, or 31.
  • the memory 12, 22, or 32 can be implemented within the processor 11, 21, or 31 or external to the processor 11, 21, or 31 in which case those can be communicatively coupled to the processor 11, 21, or 31 via various means as is known in the art.
  • the communication between the UE 10 and a base station (BS) 50 comprises non-terrestrial network (NTN) communication.
  • the base station 50 comprises spacebome platform or airborne platform or high altitude platform station.
  • the base station 50 can communicate with the UE 10 via a spacebome platform or airborne platform, e.g., NTN satellite 60, as illustrated in FIG. IB.
  • the BS 50 can be a serving cell or a target cell.
  • FIG. IB illustrates a system which includes a base station 50 and one or more UEs 10.
  • the system may include more than one base station 50, and each of the base stations 50 may connect to one or more UEs 10.
  • the base station 50 as illustrated in FIG. IB may be a moving base station, e.g., spacebome vehicle (satellite) or airborne vehicle (drone).
  • the UE 10 can transmit transmissions to the base station 50 and the UE 10 can also receive the transmission from the base station 50.
  • the moving base station can also serve as a relay which relays the received transmission from the UE 10 to a ground base station or vice versa.
  • a satellite 60 may be seen as a relay point which relays the communications between a UE 10 and a base station 50, e.g., gNB/eNB.
  • Spacebome platform includes satellite 60 and the satellite 40 includes LEO satellite, MEO satellite, and GEO satellite. While the satellite 60 is moving, the LEO satellite and MEO satellite are moving with regard to a given location on earth. However, for GEO satellite, the GEO satellite is relatively static with regard to a given location on earth.
  • Spacebome platform includes a satellite and the satellite includes low earth orbiting (LEO) satellite, medium earth orbiting (MEO) satellite and geostationary earth orbiting (GEO) satellite. While the satellite is moving, the LEO and MEO satellite is moving with regard to a given location on earth. However, for GEO satellite, the GEO satellite is relatively static with regard to a given location on earth.
  • LEO low earth orbiting
  • MEO medium earth orbiting
  • GEO geostationary earth orbiting
  • the transceiver 13 is configured to receive, from the serving cell 20, a handover command for a handover procedure for the UE 10 switching from the serving cell 20 to the target cell 30, the transceiver 13 is configured to transmit, to the target cell 30, an uplink transmission according to the handover command, and the transceiver 13 is configured to receive, from the target cell 30, a message.
  • NTN non-terrestrial network
  • NR new radio
  • the transceiver 23 is configured to transmit, to the target cell 30, a handover request for a handover procedure for the UE 10 switching from the serving cell 20 to the target cell 30, the transceiver 23 is configured to receive, from the target cell 30, a response, and the transceiver 23 is configured to transmit, to the UE 10, a handover command for the handover procedure for the UE 10 switching from the serving cell 20 to the target cell 30.
  • NTN non-terrestrial network
  • NR new radio
  • the transceiver 33 is configured to receive, from the serving cell 20, a handover request for a handover procedure for the UE 10 switching from the serving cell 20 to the target cell 30, the transceiver 33 is configured to transmit, to the serving cell 20, a response, the transceiver 33 is configured to receive, from the UE 10, an uplink transmission relevant to a handover command, and the transceiver 33 is configured to transmit, to the UE 10, a message.
  • NTN non-terrestrial network
  • NR new radio
  • the method 200 includes: a block 210, receiving, from a serving cell, a handover command for a handover procedure for the UE switching from the serving cell to a target cell, a block 220, transmitting, to the target cell, an uplink transmission according to the handover command, and a block 230, receiving, from the target cell, a message.
  • NTN nonterrestrial network
  • NR new radio
  • FIG. 3 illustrates a method 300 of wireless communication by a serving cell according to an embodiment of the present disclosure.
  • the method 300 includes: a block 310, transmitting, to a target cell, a handover request for a handover procedure for a user equipment (UE) switching from the serving cell to the target cell, a block 320, receiving, from the target cell, a response, and a block 330, transmitting, to the UE, a handover command for the handover procedure for the UE switching from the serving cell to the target cell.
  • NTN non-terrestrial network
  • NR new radio
  • FIG. 4 illustrates a method 400 of wireless communication by a target cell according to an embodiment of the present disclosure.
  • the method 400 includes: a block 410, receiving, from a serving cell, a handover request for a handover procedure for a user equipment (UE) switching from the serving cell to the target cell, a block 420, transmitting, to the serving cell, a response, a block 430, receiving, from the UE, an uplink transmission relevant to a handover command, and a block 440, transmitting, to the UE, a message.
  • NTN non-terrestrial network
  • NR new radio
  • the handover command comprises a command for a random access channel-less (RACH-less) handover for the UE switching from the serving cell to the target cell.
  • the handover command comprises at least one of following information: an ephemeris data of the target cell; common timing advance (TA) relevant parameters of the target cell; an offset value; a new cell-radio network temporary identifier (C-RNTI); a configuration for one or more physical uplink shared channel (PUSCH) resources of the target cell, or a configuration of a search space.
  • the one or more PUSCH resources comprises one or more configured uplink grants (CUL grants).
  • the UE when the ephemeris data of the target cell is not provided by the serving cell, the UE assumes that the ephemeris data of the target cell is same as an ephemeris data of the serving cell. In some embodiments, when the common TA relevant parameters of the target cell are not provided by the serving cell, the UE assumes that the common TA relevant parameters of the target cell are same as common TA relevant parameters of the serving cell, or the UE assumes that a common TA of the target cell is zero. In some embodiments, the method further comprises performing synchronization by the UE with the target cell.
  • the synchronization uses the ephemeris data of the target cell and/or the common TA relevant parameters of the target cell. In some embodiments, after the synchronization is performed by the UE, the UE selects a first available PUSCH resource from the one or more PUSCH resources for uplink transmission.
  • the one or more CUL grants are dynamically scheduled by the target cell.
  • the method further comprises starting to monitor a physical downlink control channel (PDCCH) in the search space by the UE.
  • the search space is configured for RACH-less handover.
  • the uplink transmission comprises the new C-RNTI or a TA relevant information of the UE.
  • the message from the target cell comprises the new C-RNTI, a contention resolution identifier (ID), or an acknowledgement. In some embodiments, if the UE verifies that the contention resolution ID is matched with an ID of the UE, the handover procedure is complete.
  • the handover procedure is complete.
  • the acknowledgement is carried by a downlink control information (DCI) and/or the acknowledgement comprises a hybrid automatic repeat request acknowledgment (HARQ-ACK) information.
  • DCI downlink control information
  • HARQ-ACK hybrid automatic repeat request acknowledgment
  • FIG. 5 illustrates a communication system including a base station (BS) and a UE according to another embodiment of the present disclosure.
  • the communication system may include more than one base station, and each of the base stations may connect to one or more UEs.
  • the base station illustrated in FIG. 1A may be a moving base station, e.g., spacebome vehicle (satellite) or airborne vehicle (drone).
  • the UE can transmit transmissions to the base station and the UE can also receive the transmission from the base station.
  • the moving base station can also serve as a relay which relays the received transmission from the UE to a ground base station or vice versa.
  • Spacebome platform includes satellite and the satellite includes LEO satellite, MEO satellite and GEO satellite. While the satellite is moving, the LEO and MEO satellite is moving with regards to a given location on earth. However, for GEO satellite, the GEO satellite is relatively static with regards to a given location on earth.
  • a moving base station or satellite e.g., in particular for LEO satellite or drone, communicates with a user equipment (UE) on the ground. Due to long distance between the UE and the base station on satellite, the beamformed transmission is needed to extend the coverage.
  • UE user equipment
  • FIG. 6 where a base station is integrated in a satellite or a drone, and the base station transmits one or more beams to the ground forming one or more coverage areas called footprint.
  • the BS transmits three beams (beam 1 , beam 2 and beam3) to form three footprints (footprint 1, 2 and 3), respectively.
  • 3 beams are transmitted at 3 different frequencies.
  • the bit position is associated with a beam.
  • a moving base station e.g., in particular for LEO satellite or drone, communicates with a user equipment (UE) on the ground.
  • UE user equipment
  • each beam may be transmitted at dedicated frequencies so that the beams for footprint 1 , 2 and 3 are non-overlapped in a frequency domain.
  • the advantage of having different frequencies corresponding to different beams is that the inter-beam interference can be minimized.
  • a moving base station e.g., in particular for LEO satellite or drone, communicates with a user equipment (UE) on the ground.
  • a round trip time (RTT) between the BS and the UE is time varying.
  • the RTT variation is related to a distance variation between the BS and the UE.
  • the RTT variation rate is proportional to a BS motion velocity.
  • the BS will adjust an uplink transmission timing and/or frequency for the UE.
  • a method for uplink synchronization adjustment is provided, and the uplink synchronization adjustment comprises at least one of the followings: a transmission timing adjustment or a transmission frequency adjustment.
  • the transmission timing adjustment further comprises a timing advance (TA) adjustment.
  • TA timing advance
  • FIG. 7 illustrates an uplink-downlink timing relation according to an embodiment of the present disclosure.
  • T f refers to a radio frame duration.
  • A/ refers to subcarrier spacing.
  • n f refers to a system frame number (SFN).
  • T c refers to a basic time unit for NR. refers to a subframe duration.
  • Each frame is divided into two equally-sized half-frames of five subframes each with half- frame 0 consisting of subframes 0 to 4 and half-frame 1 consisting of subframes 5 to 9. There is one set of frames in the uplink and one set of frames in the downlink on a carrier.
  • TJA refers to timing advance between downlink and uplink.
  • a TA refers to timing advance between downlink and uplink.
  • N TA ⁇ offset refers to a fixed offset used to calculate the timing advance.
  • T c refers to a basic time unit for NR.
  • the examples given in this disclosure can be applied for loT device or NB-IoT UE in NTN systems, but the method is not exclusively restricted to NTN system nor for loT devices or NB-IoT UE.
  • the examples given in this disclosure can be applied for NR systems, LTE systems, orNB-IoT systems.
  • FIG. 8 illustrates a handover procedure for a UE switching from a serving cell to a target cell according to an embodiment of the present disclosure.
  • FIG. 8 illustrates that, in some examples, a handover procedure for a UE to handover from a source cell (or called a serving cell) to a target cell without going through an RACK procedure, that is also called an RACH-less procedure, for NR system is depicted as follows.
  • the handover command when a UE receives a handover command from the serving cell, the handover command may trigger a handover procedure. If the UE is also configured with an RACH- less configuration, the UE may go through an RACH-less procedure.
  • the handover message from the source cell contains at least one of the following information: an ephemeris data of the target cell; common TA relevant parameters of the target cell; an offset value; a new C-RNTI.
  • the UE is provided with a configuration for one or more PUSCH resources of the target cell, where each of the configured PUSCH resource is called a configured uplink grant (CUL grant).
  • CUL grant configured uplink grant
  • the UE when the common TA relevant parameters of the target cell are not provided by the serving cell, the UE assumes that the common TA relevant parameters of the target cell are the same as the source cell or optionally the UE assumes that the common TA of the target cell is zero. [0104] Then, the UE may perform synchronization with the target cell. Optionally, the synchronization may use the ephemeris data and/or the common TA parameters. When the synchronization is performed, the UE may determine an uplink grant for uplink transmission. In some examples, when the UE is provided one or more CUL grants, the UE may select a first available PUSCH resource after synchronization is complete. In some examples, the uplink grant is dynamically scheduled by the target cell. The UE may start to monitor the PDCCH in a search space. In some examples, the search space is configured for RACK less handover. In some examples, the search space configuration is provided to the UE in handover command message.
  • the UE performs uplink transmission in the selected uplink resource.
  • the UE includes the new C-RNTI in the uplink transmission.
  • UE reports its TA relevant information in the uplink transmission.
  • the target cell when the target cell receives the uplink transmission, the target cell verifies the C-RNTI. If the C-RNTI is verified, the target cell sends a contention resolution message to the UE.
  • the contention resolution message includes the C-RNTI or a contention resolution ID.
  • the target cell sends an acknowledgement to the UE, where the acknowledgement may be a DCI containing HARQ-ACK information.
  • the acknowledgement may be a DCI scheduling an uplink transmission.
  • the UE when the UE receives the contention resolution message from the cell, the UE verifies the contention resolution ID, if the ID is matched with the UE ID, the handover procedure is complete.
  • the handover procedure is complete, where the ACK information may be carried by a DCI and the ACK information is a HARQ-ACK information.
  • NTN non-terrestrial network
  • NR new radio
  • Some embodiments of the present disclosure are used by 5G-NR chipset vendors, V2X communication system development vendors, automakers including cars, trains, trucks, buses, bicycles, moto-bikes, helmets, and etc., drones (unmanned aerial vehicles), smartphone makers, communication devices for public safety use, AR/VR device maker for example gaming, conference/seminar, education purposes.
  • Some embodiments of the present disclosure are a combination of “techniques/processes” that can be adopted in 3 GPP specification to create an end product.
  • Some embodiments of the present disclosure could be adopted in the 5G NR unlicensed band communications.
  • FIG. 7 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software.
  • FIG. 7 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other at least as illustrated.
  • the application circuitry 730 may include a circuitry such as, but not limited to, one or more single- core or multi-core processors.
  • the processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors.
  • the processors may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.
  • the baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors.
  • the processors may include a baseband processor.
  • the baseband circuitry may handle various radio control functions that enables communication with one or more radio networks via the RF circuitry.
  • the radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc.
  • the baseband circuitry may provide for communication compatible with one or more radio technologies.
  • the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN), a wireless local area network (WLAN), a wireless personal area network (WPAN).
  • EUTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multimode baseband circuitry
  • the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency.
  • baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
  • the RF circuitry 710 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium.
  • the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network.
  • the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency.
  • RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
  • the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and/or the application circuitry.
  • “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • some or all of the constituent components of the baseband circuitry, the application circuitry, and/or the memory/storage may be implemented together on a system on a chip (SOC).
  • SOC system on a chip
  • the memory/storage 740 may be used to load and store data and/or instructions, for example, for system.
  • the memory/storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM)), and/or non-volatile memory, such as flash memory.
  • DRAM dynamic random access memory
  • flash memory non-volatile memory
  • the I/O interface 780 may include one or more user interfaces designed to enable user interaction with the system and/or peripheral component interfaces designed to enable peripheral component interaction with the system.
  • User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc.
  • Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface.
  • the sensor 770 may include one or more sensing devices to determine environmental conditions and/or location information related to the system.
  • the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit.
  • the positioning unit may also be part of, or interact with, the baseband circuitry and/or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.
  • GPS global positioning system
  • the display 750 may include a display, such as a liquid crystal display and a touch screen display.
  • the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, an AR/VR glasses, etc.
  • system may have more or less components, and/or different architectures.
  • methods described herein may be implemented as a computer program.
  • the computer program may be stored on a storage medium, such as a non-transitory storage medium.
  • the units as separating components for explanation are or are not physically separated.
  • the units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments.
  • each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.
  • the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer.
  • the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product.
  • one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product.
  • the software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure.
  • the storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk, or other kinds of media capable of storing program codes.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil et un procédé de communication sans fil. Le procédé exécuté par un équipement utilisateur (UE) consiste à : recevoir (210), d'une cellule de desserte, une commande de transfert pour une procédure de transfert permettant à l'UE de passer de la cellule de desserte à une cellule cible ; transmettre (220), à la cellule cible, une transmission de liaison montante selon la commande de transfert ; et recevoir (230) un message de la cellule cible.
PCT/IB2021/000938 2021-12-16 2021-12-16 Appareil et procédé de communication sans fil Ceased WO2023111619A1 (fr)

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PCT/IB2021/000938 WO2023111619A1 (fr) 2021-12-16 2021-12-16 Appareil et procédé de communication sans fil

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WO2025060685A1 (fr) * 2023-09-21 2025-03-27 Mediatek Singapore Pte. Ltd. Procédé et appareil pour des améliorations sur un transfert sans canal d'accès aléatoire (rach)

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EP3799470A1 (fr) * 2019-09-24 2021-03-31 Panasonic Intellectual Property Corporation of America Équipement utilisateur et station de base impliqués dans un transfert

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EP3799470A1 (fr) * 2019-09-24 2021-03-31 Panasonic Intellectual Property Corporation of America Équipement utilisateur et station de base impliqués dans un transfert

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025060685A1 (fr) * 2023-09-21 2025-03-27 Mediatek Singapore Pte. Ltd. Procédé et appareil pour des améliorations sur un transfert sans canal d'accès aléatoire (rach)

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