WO2021255491A1 - Appareil et procédé pour un ajustement de transmission dans un réseau non terrestre - Google Patents

Appareil et procédé pour un ajustement de transmission dans un réseau non terrestre Download PDF

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Publication number
WO2021255491A1
WO2021255491A1 PCT/IB2020/000855 IB2020000855W WO2021255491A1 WO 2021255491 A1 WO2021255491 A1 WO 2021255491A1 IB 2020000855 W IB2020000855 W IB 2020000855W WO 2021255491 A1 WO2021255491 A1 WO 2021255491A1
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WO
WIPO (PCT)
Prior art keywords
base station
user equipment
adjustment
location
indication field
Prior art date
Application number
PCT/IB2020/000855
Other languages
English (en)
Inventor
Hao Lin
Original Assignee
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/IB2020/000855 priority Critical patent/WO2021255491A1/fr
Publication of WO2021255491A1 publication Critical patent/WO2021255491A1/fr

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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
    • H04B7/18502—Airborne stations
    • H04B7/18504—Aircraft used as relay or high altitude atmospheric platform
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • the present disclosure relates to the field of communication systems, and more particularly, to an apparatus (such as a user equipment (UE) and/or a base station) and a method for transmission adjustment in a non-terrestrial network (NTN), which can provide a good communication performance and high reliability.
  • an apparatus such as a user equipment (UE) and/or a base station
  • NTN non-terrestrial network
  • Non-terrestrial networks refer to networks, or segments of networks, using a spaceborne vehicle or an airborne vehicle for transmission.
  • Spaceborne vehicles include satellites including low earth orbiting (LEO) satellites, medium earth orbiting (MEO) satellites, geostationary earth orbiting (GEO) satellites, and highly elliptical orbiting (E1EO) satellites.
  • Airborne vehicles include high altitude platforms (ElAPs) encompassing unmanned aircraft systems (UAS) including lighter than air (LTA) unmanned aerial systems (UAS) and heavier than air (E1TA) UAS, all operating in altitudes typically between 8 and 50 km, quasi-stationary.
  • RTT round trip time
  • UE user equipment
  • UE/satellite a round trip time between a sender (satellite/user equipment (UE)) and a receiver (UE/satellite)
  • TA timing advance
  • Elowever in the NTN, a long RTT will result in a very long TA. Plow to indicate this long TA is still an open issue.
  • Tdoc number Rl-1910982 is a related prior art for this field. More particularly, Rl-1910982 discloses on NTN synchronization, random access, and timing advance. Proposal 9 of Rl-1910982 proposes to use adownlink control indicator (DCI) to indicate timing advance.
  • DCI downlink control indicator
  • NTN non-terrestrial network
  • An object of the present disclosure is to propose an apparatus (such as a user equipment (UE) and/or a base station) and a method for transmission adjustment in a non-terrestrial network (NTN), which can solve issues in the prior art, provide a good communication performance and high reliability, and/or provide a method about how to use the DCI to indicate the transmission adjustment.
  • NTN non-terrestrial network
  • a method of transmission adjustment of a user equipment in a non terrestrial network comprises receiving a downlink control indicator (DCI) from a base station, wherein the DCI comprises a first indication field in a first location; and obtaining the first indication field in the first location, wherein the first indication field indicates a first information relevant to an adjustment of a transmission.
  • DCI downlink control indicator
  • a user equipment for transmission adjustment in a non-terrestrial network comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the transceiver is configured to receive a downlink control indicator (DCI) from a base station, wherein the DCI comprises a first indication field in a first location.
  • the processor is configured to obtain the first indication field in the first location, wherein the first indication field indicates a first information relevant to an adjustment of a transmission.
  • DCI downlink control indicator
  • a method of transmission adjustment of a base station in a non-terrestrial network comprises transmitting a downlink control indicator (DCI) to a user equipment, wherein the DCI comprises a first indication field in a first location, and the first indication field indicates a first information relevant to an adjustment of a transmission.
  • DCI downlink control indicator
  • a base station for transmission adjustment in a non-terrestrial network comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the transceiver is configured to transmit a downlink control indicator (DCI) to a user equipment, wherein the DCI comprises a first indication field in a first location, and the first indication field indicates a first information relevant to an adjustment of a transmission.
  • DCI downlink control indicator
  • 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 is a block diagram of one or more user equipments (UE) and a base station (e.g., gNB) for transmission adjustment in a communication network system (e.g., non-terrestrial network (NTN)) according to an embodiment of the present disclosure.
  • UE user equipments
  • gNB base station
  • NTN non-terrestrial network
  • FIG. 2 is a flowchart illustrating a method of transmission adjustment of a user equipment in a non-terrestrial network (NTN) according to an embodiment of the present disclosure.
  • NTN non-terrestrial network
  • FIG. 3 is a flowchart illustrating a method of transmission adjustment of a base station in a non-terrestrial network (NTN) according to an embodiment of the present disclosure.
  • NTN non-terrestrial network
  • FIG. 4 is a schematic diagram illustrating a communication system including a base station (BS) and a UE according to another embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position according to another embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits, the DCI format contains one or more set of indication fields, each field is represented by an information block according to another embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with a serving cell identity according to another embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram illustrating that a BS transmits 3 beams to the ground forming 3 footprints according to another embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with beam according to another embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with footprint according to another embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with frequency according to another embodiment of the present disclosure.
  • FIG. 12 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with bandwidth part (BWP) according to another embodiment of the present disclosure.
  • BWP bandwidth part
  • FIG. 13 is a schematic diagram illustrating that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with resource block (RB) set according to another embodiment of the present disclosure.
  • FIG. 14 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.
  • FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and a base station (e.g., gNB) 20 for transmission adjustment in a communication network system 30 (e.g., non-terrestrial network (NTN)) according to an embodiment of the present disclosure are provided.
  • the communication network system 30 includes the one or more UEs 10 and the base station 20.
  • the one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12, the transceiver 13.
  • the base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22, the transceiver 23.
  • the processor 11 or 21 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 or 21.
  • the memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21.
  • the transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives a radio signal.
  • the processor 11 or 21 may include application-specific integrated circuit (ASIC), other chipset, logic circuit and/or data processing device.
  • the memory 12 or 22 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other storage device.
  • the transceiver 13 or 23 may include baseband circuitry to process radio frequency signals.
  • modules e.g., procedures, functions, and so on
  • the modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21.
  • the memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.
  • the transceiver 13 is configured to receive a downlink control indicator (DCI) from the base station 20, wherein the DCI comprises a first indication field in a first location.
  • the processor 11 is configured to obtain the first indication field in the first location, wherein the first indication field indicates a first information relevant to an adjustment of a transmission.
  • the transceiver 23 is configured to transmit a downlink control indicator (DCI) to the user equipment 10, wherein the DCI comprises a first indication field in a first location, and the first indication field indicates a first information relevant to an adjustment of a transmission.
  • DCI downlink control indicator
  • the processor 11 is further configured to adapt the transmission based on the adjustment.
  • the transmission is an uplink transmission.
  • the uplink transmission comprises at least one of the followings: a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH, a sounding reference signal (SRS), or a physical random access channel (PRACH).
  • the first information comprises at least one of the followings: a transmission timing, an adjustment of the transmission timing, a transmission frequency, or an adjustment of the transmission frequency.
  • the DCI comprises a group common DCI.
  • the DCI is detected by the user equipment in a common search space (CSS) set.
  • SCS common search space
  • the DCI is detected by the user equipment in a type 3 physical downlink control channel (PDCCH) CSS set.
  • the DCI comprises a DCI format, and the DCI format comprises the first indication field.
  • the first indication field is located in the first location in the DCI format.
  • the DCI format contains Y bits
  • the first indication field contains X bits
  • X and Y are integers
  • Y is greater than or equal to X.
  • the first indication field is associated with at least one of the followings: a serving cell, a beam of the serving cell, a footprint of the serving cell, a frequency location of the beam, a bandwidth part (BWP) of the serving cell, a resource block set, a reference signal, a downlink signal, or the user equipment.
  • the first location comprises a start bit location for the first indication field.
  • the DCI format comprises one or more sets of indication fields, each indication field is represented by an information block, and the first indication field is one of the one or more sets of indication fields.
  • the first location comprises an information block index, in which the first indication field is located.
  • the reference signal comprises at least one of the following: a channel state information-reference signal (CSI-RS), a tracking reference signal (TRS), a downlink demodulation reference signal (DMRS).
  • CSI-RS channel state information-reference signal
  • TRS tracking reference signal
  • DMRS downlink demodulation reference signal
  • the downlink signal comprises at least a synchronization signal/physical broadcast channel block (SSB).
  • the first location is associated with at least one of the followings: the serving cell, the beam of the serving cell, the footprint of the serving cell, the frequency location of the beam, the bandwidth part (BWP) of the serving cell, the resource block set, the reference signal, the downlink signal, or the user equipment.
  • the BWP comprises at least one of the followings: an active downlink BWP, an active uplink BWP, an initial downlink BWP, an initial uplink BWP, a configured downlink BWP, or a configured uplink BWP.
  • the footprint comprises a coverage area of the serving cell.
  • the coverage area is related to a beam projection from the base station to a ground.
  • the coverage area is related to the frequency location of the beam.
  • the first location is configured by a radio resource control (RRC) signaling or pre-defined.
  • RRC radio resource control
  • the transmission timing is related to an uplink transmission, where the In some embodiments, the transmission timing comprises at least one of the followings: a timing advance or a resource allocation offset.
  • the adjustment of the transmission timing comprises at least one of the followings: a timing advance adjustment, a timing drift, or a resource allocation offset adjustment.
  • the timing advance adjustment is used to update a timing advance value.
  • the transmission frequency comprises at least a Doppler shift of the transmission.
  • the adjustment of the transmission frequency comprises at least one of the followings: a Doppler shift adjustment or a frequency drift.
  • the timing advance value is relevant to a frame offset by which an uplink frame starts earlier than a corresponding downlink frame at the user equipment side.
  • the uplink transmission is located in a time domain resource.
  • the time domain resource is determined at least with the resource allocation offset or the resource allocation offset adjustment.
  • the time domain resource comprises one or more symbols in time domain and/or one or more slots in time domain.
  • the timing drift is relevant to a distance variation between the base station and a reference location.
  • a timing advance adjustment is relevant to the distance variation between the base station and the reference location.
  • the reference location is known to the UE.
  • the distance variation is related to a timing advance variation of the UE.
  • the timing advance variation of the UE is related to a round trip time variation between the base station and the UE.
  • the timing drift comprises one or more parameters relevant to the base station mobility.
  • the one or more parameters comprise at least one of the following: a range of candidate values of the timing advance adjustment, a range of candidate values of the velocity of the base station, a range of candidate values of the time interval, or a range of candidate values of the angle of the mobility of the base station.
  • the reference location is within the coverage area of the base station.
  • the distance variation is related to at least one of the followings: a velocity of motion of the base station or an angle of motion of the base station or a time interval of the base station mobility.
  • the distance variation is related to a round trip time (RTT) variation, and the RTT variation is related to a timing advance variation.
  • a value of X is related to at least one of the followings: a range of candidate values of the timing advance adjustment, a range of candidate values of the velocity of the base station, a range of candidate values of the time interval, or a range of candidate values of the angle of the mobility of the base station.
  • the base station comprises: spaceborne platform or airborne platform or high altitude platform station.
  • FIG. 2 illustrates a method 200 for transmission adjustment of a UE in a communication network system (e.g., non-terrestrial network (NTN)) according to an embodiment of the present disclosure.
  • the method 200 includes: a block 202, receiving a downlink control indicator (DCI) from a base station, wherein the DCI comprises a first indication field in a first location; and a block 204, obtaining the first indication field in the first location, wherein the first indication field indicates a first information relevant to an adjustment of a transmission.
  • DCI downlink control indicator
  • FIG. 3 illustrates a method 300 for transmission adjustment of a BS in a communication network system (e.g., non-terrestrial network (NTN)) according to an embodiment of the present disclosure.
  • the method 300 includes: a block 302, transmitting a downlink control indicator (DCI) to a user equipment, wherein the DCI comprises a first indication field in a first location, and the first indication field indicates a first information relevant to an adjustment of a transmission.
  • DCI downlink control indicator
  • the method further comprises adapting the transmission based on the adjustment.
  • the first information comprises at least one of the followings: a transmission timing, an adjustment of the transmission timing, a transmission frequency, or an adjustment of the transmission frequency.
  • the DCI comprises a group common DCI.
  • the DCI is detected by the user equipment in a common search space (CSS) set.
  • the DCI is detected by the user equipment in a type 3 physical downlink control channel (PDCCH) CSS set.
  • the DCI comprises a DCI format, and the DCI format comprises the first indication field.
  • the first indication field is located in the first location in the DCI format.
  • the DCI format contains Y bits
  • the first indication field contains X bits
  • X and Y are integers
  • Y is greater than or equal to X.
  • the first indication field is associated with at least one of the followings: a serving cell, a beam of the serving cell, a footprint of the serving cell, a frequency location of the beam, a bandwidth part (BWP) of the serving cell, a resource block set, a reference signal, a downlink signal, or the user equipment.
  • the first location comprises a start bit location for the first indication field.
  • the DCI format comprises one or more sets of indication fields, each indication field is represented by an information block, and the first indication field is one of the one or more sets of indication fields.
  • the first location comprises an information block index, in which the first indication field is located.
  • the reference signal comprises at least one of the following: a channel state information-reference signal (CSI-RS), a tracking reference signal (TRS), a downlink demodulation reference signal (DMRS).
  • CSI-RS channel state information-reference signal
  • TRS tracking reference signal
  • DMRS downlink demodulation reference signal
  • the downlink signal comprises at least a synchronization signal/physical broadcast channel block (SSB).
  • the first location is associated with at least one of the followings: the serving cell, the beam of the serving cell, the footprint of the serving cell, the frequency location of the beam, the bandwidth part (BWP) of the serving cell, the resource block set, the reference signal, the downlink signal, or the user equipment.
  • the BWP comprises at least one of the followings: an active downlink BWP, an active uplink BWP, an initial downlink BWP, an initial uplink BWP, a configured downlink BWP, or a configured uplink BWP.
  • the footprint comprises a coverage area of the serving cell.
  • the coverage area is related to a beam projection from the base station to a ground.
  • the coverage area is related to the frequency location of the beam.
  • the first location is configured by a radio resource control (RRC) signaling or pre-defined.
  • RRC radio resource control
  • the transmission timing is related to an uplink transmission, where the In some embodiments, the transmission timing comprises at least one of the followings: a timing advance or a resource allocation offset.
  • the adjustment of the transmission timing comprises at least one of the followings: a timing advance adjustment, a timing drift, or a resource allocation offset adjustment.
  • the timing advance adjustment is used to update a timing advance value.
  • the transmission frequency comprises at least a Doppler shift of the transmission.
  • the adjustment of the transmission frequency comprises at least one of the followings: a Doppler shift adjustment or a frequency drift.
  • the timing advance value is relevant to a frame offset by which an uplink frame starts earlier than a corresponding downlink frame at the user equipment side.
  • the uplink transmission is located in a time domain resource.
  • the time domain resource is determined at least with the resource allocation offset or the resource allocation offset adjustment.
  • the time domain resource comprises one or more symbols in time domain and/or one or more slots in time domain.
  • the timing drift is relevant to a distance variation between the base station and a reference location.
  • a timing advance adjustment is relevant to the distance variation between the base station and the reference location.
  • the reference location is known to the UE.
  • the distance variation is related to a timing advance variation of the UE.
  • the timing advance variation of the UE is related to a round trip time variation between the base station and the UE.
  • the timing drift comprises one or more parameters relevant to the base station mobility.
  • the one or more parameters comprise at least one of the following: a range of candidate values of the timing advance adjustment, a range of candidate values of the velocity of the base station, a range of candidate values of the time interval, or a range of candidate values of the angle of the mobility of the base station.
  • the reference location is within the coverage area of the base station.
  • the distance variation is related to at least one of the followings: a velocity of motion of the base station or an angle of motion of the base station or a time interval of the base station mobility.
  • the distance variation is related to a round trip time (RTT) variation, and the RTT variation is related to a timing advance variation.
  • a value of X is related to at least one of the followings: a range of candidate values of the timing advance adjustment, a range of candidate values of the velocity of the base station, a range of candidate values of the time interval, or a range of candidate values of the angle of the mobility of the base station.
  • the base station comprises: spaceborne platform or airborne platform or high altitude platform station.
  • FIG. 4 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 stations, and each of the base stations may connect to one or more UEs.
  • the base station illustrated in FIG. 1 may be a moving base station, e.g. spaceborne 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.
  • Spaceborne 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 spaceborne or airborne base station e.g. in particular for LEO satellite or drone, communicates with a user equipment (UE) on the ground.
  • the round trip time (RTT) between them is time varying due to the mobility of the base station.
  • the RTT variation is related to the distance variation between the BS and the UE.
  • the RTT variation rate is proportional to the BS motion velocity.
  • the uplink transmission timing adjustment includes at least one of the following: timing advance adjustment, BS motion status adjustment, resource allocation offset adjustment.
  • the uplink transmission includes at least one of the following: PUCCH, PUSCH, SRS, or PRACH.
  • the BS sends a downlink control indicator (DCI) to indicate this adjustment for the UE.
  • DCI downlink control indicator
  • the UE detects DCI and reads the indication carried in the DCI about the adjustment. Then the UE will adapt its transmission timing for the uplink transmission.
  • the DCI is transmitted in a type 3 PDCCH common search space set.
  • the DCI has a DCI format, wherein the DCI format comprises at least one of the following: DCI format 2_0, 2_1, 2_2, 2_3, 2_4, 2_5, 2_6, 2_7.
  • the DCI format is scrambled with a configured radio network temporary identifier (RNTI).
  • RNTI radio network temporary identifier
  • FIG. 5 illustrates that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position according to another embodiment of the present disclosure.
  • the UE when the UE detects the DCI, the UE reads an indication field in the DCI format, wherein the indication field indicates the adjustment for the transmission timing.
  • the DCI format contains Y bits, and the indication field contains X bits, where X and Y are integers and Y is greater than or equal to X.
  • the values of X and Y are pre-configured or pre-defined.
  • the indication field is located in a bit position, wherein the bit position is the start bit position of the X bits. The bit position is signaled to the UE by RRC signaling.
  • FIG. 6 illustrates that a DCI format contains Y bits, an indication field contains X bits, the DCI format contains one or more set of indication fields, each field is represented by an information block according to another embodiment of the present disclosure.
  • the bit position does not correspond to the start bit position of the indication field, but the bit position indicates block index.
  • Fig. x where the DCI format contains Y bits and the Y bits are divided into four blocks, each block contains X bits.
  • the bit position indicates block 1 or block 2 or block 3 or block 4, once the UE is configured by a block number, the UE will read the X bit indication field in the corresponding block, e.g. the UE is configured by block 2, the UE will read the X bits corresponding to block 2 location in the DCI format.
  • the bit position is configured for the dedicated UE only. It means that the indication field is used only for the UE.
  • they will be provided by RRC signaling with other bit positions. For instance, there are two UEs (UE1 and UE2). For UE1, it will be configured by RRC signaling with bit position 1 and for UE2, it will be configured by RRC signaling with bit position 2.
  • FIG. 7 illustrates that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with a serving cell identity according to another embodiment of the present disclosure.
  • the bit position is associated with a serving cell.
  • the bit position is indicated by RRC signaling and it is associated with the cell identity. All the UEs who are connected with the serving cell will use the configured bit position. It means that the same indication field is read by different UEs who are connected with the serving cell, and when these UEs transmit an uplink transmission, these UEs will use the indicated transmission timing adjustment to adjust the transmission timing.
  • the UE is connected to more than one serving cell (e.g.
  • the UE will read the indication fields corresponding to cell 1 and cell 2, respectively.
  • the indication field for cell 1 and cell 2 have different bit sizes, e.g. XI bits for cell 1 and X2 bits for cell 2.
  • the number of bits XI and X2 are pre-defined or RRC configured.
  • FIG. 8 illustrates that a BS transmits 3 beams to the ground forming 3 footprints according to another embodiment of the present disclosure.
  • FIG. 9 illustrates that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with beam according to another embodiment of the present disclosure.
  • 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.
  • the bit position is indicated by RRC signaling and it is associated with the beam index as illustrated in FIG. 9. All the UEs who are under the coverage of the beam will use the configured bit position. It means that the same indication field is read by different UEs who are under the coverage of the beam, and when these UEs transmit an uplink transmission, they will use the indicated transmission timing adjustment to adjust the transmission timing.
  • the beams can be represented by reference signals, e.g. CSI-RS or SS/PBCH blocks (SSB).
  • the different beams can be associated with different CSI-RS resource indexes, and/or different SS/PBCH block indexes and/or different candidate SS/PBCH block indexes.
  • the bit position configured by RRC signaling can be associated with CSI-RS resource index, and/or SS/PBCH block index and/or candidate SS/PBCH block index.
  • FIG. 10 illustrates that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with footprint according to another embodiment of the present disclosure.
  • the bit position is associated with footprint, e.g. the bit position is configured associated with a footprint index.
  • the same indication field is read by different UEs who are in the same footprint, and when these UEs transmit an uplink transmission, they will use the indicated transmission timing adjustment to adjust the transmission timing.
  • FIG. 11 illustrates that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with frequency according to another embodiment of the present disclosure.
  • the one or more beams from the BS are transmitted at different frequencies, e.g. the BS transmits three beams (beam 1, beam 2 and beam3) at frequencies (frequency 1, frequency 2 and frequency 3), respectively.
  • the bit position is associated with frequency, e.g. the bit position is configured associated with a frequency index.
  • FIG. 12 illustrates that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with bandwidth part (BWP) according to another embodiment of the present disclosure.
  • the bit position is associated with a BWP. In this case the bit position is indicated by RRC signaling and it is associated with the BWP index.
  • the UE is configured with two BWP (BWP1 and BWP2).
  • the bit position is associated with the BWP index. For instance, if the UE is configured with BWP1 and BWP2, and the BS will inform the UE about the bit positions for BWP1 and BWP2, respectively, via RRC signaling.
  • the UE detects the DCI format, the UE will read the indication field of the corresponding BWP index.
  • the BWP comprises active downlink BWP and/or initial downlink BWP and/or configured downlink BWP and/or active uplink BWP and/or initial uplink BWP and/or configured uplink BWP.
  • FIG. 13 is a schematic diagram illustrates that a DCI format contains Y bits, an indication field contains X bits and starts from a bit position, and the bit position is associated with resource block (RB) set according to another embodiment of the present disclosure.
  • the bit position is associated with one or more set of resource blocks.
  • a BWP contains one or more resource block set (RB set) corresponding to one or more RB set indexes.
  • the bit position is associated with one or more RB set indexes, where the RB set indexes are defined in a BWP.
  • the one or more RB sets are defined in a carrier for a serving cell, e.g. a carrier bandwidth is divided into one or more RB sets, and the bit position is associated with one or more RB set indexes, where the RB set indexes are defined in a carrier bandwidth.
  • the UE is configured with a first RRC parameter intraCellGuardBandUL-rl7 for UL carrier and/or a second RRC parameter intraCellGuardBandDL-rl7 for DL carrier to derive RB sets for UL and/or DL carrier
  • the UE is provided with N RB-set x — 1 intra-cell guard bands on a carrier, each defined by start common resource block (CRB) and size in number of CRBs, GB s ⁇ x rt,>1 and , provided by higher layer parameters startCRB-rl 7 for the start location of the intra-cell guard band s and nrofCRBs-rl 7 a length of the intra-cell guard band s respectively.
  • CRB start common resource block
  • the subscript x is set to DL and UL for the downlink and uplink, respectively. Where there is no risk of confusion, the subscript x can be dropped.
  • the intra-cell guard bands separate N RB-setx RB sets, each defined by start and end CRB, RB x rt ,m and RB e c ' m , respectively.
  • UE does not expect that nrofCRBs-rl7 is configured with non-zero value smaller than the applicable intra-cell guard bands as specified in [TS 38.101-1] bandwidth and is the size of the carrier bandwidth in terms of number of CRBs.
  • the UE determines the CRB indices for the intra-cell guard band(s), if any, and corresponding RB set(s) according to the nominal intra-cell guard band and RB set pattern as specified in [TS 38.101-1] corresponding to m and carrier size
  • the UE determines the CRB indices for the intra-cell guard band(s), if any, and corresponding RB set(s) according to the nominal intra-cell guard band and RB set pattern as specified in [TS 38.101-1] corresponding to m and carrier size
  • BWP-DownlinkCommon or BWP-DownlinkDedicated for the DL BWP or BWP-UplinkCommon or BWP-UplinkDedicated for the UL BWP.
  • RB sets are numbered in increasing order from 0 to N R ⁇ L p set x — 1 where N R ⁇ L p set x is the number of RB sets contained in the BWP i and RB set 0 within the BWP i corresponds to RB set sO in the carrier and RB set N R ⁇ L p setx — 1 within the BWP i corresponds to RB set si in the carrier.
  • the indication field indicates a TA adjustment.
  • the UE applies the TA adjustment to the uplink transmission as described in section 4.2 of TS 38.213.
  • Section 4.2 of TS 38.213 is illustrated as follows.
  • a UE can be provided a value A TA offset of a timing advance offset for a serving cell by n-TimingAdvanceOffset for the serving cell. If the UE is not provided n-TimingAdvanceOffset for a serving cell, the UE determines a default value A TA offset °f the timing advance offset for the serving cell as described in [10, TS 38.133].
  • a same timing advance offset value A TA offset applies to both carriers.
  • the UE Upon reception of a timing advance command for a TAG, the UE adjusts uplink timing for PUSCH/SRS/PUCCH transmission on all the serving cells in the TAG based on a value A TA offset that the UE expects to be same for all the serving cells in the TAG and based on the received timing advance command where the uplink timing for PUSCH/SRS/PUCCH transmissions is the same for all the serving cells in the TAG.
  • the timing advance command for a TAG indicates the change of the uplink timing relative to the current uplink timing for the TAG in multiples of 16 - 64 -7’ c /2“ .
  • the start timing of the random access preamble is described in [4, TS 38.211].
  • a timing advance command [11, TS 38.321]
  • N tA is defined in [4, TS 38.211] and is relative to the SCS of the first uplink transmission from the UE after the reception of the random access response.
  • the timing advance command value is relative to the largest SCS of the multiple active UL BWPs.
  • the applicable N TA new value for an UL BWP with lower SCS may be rounded to align with the timing advance granularity for the UL BWP with the lower SCS while satisfying the timing advance accuracy requirements in [10, TS38.133].
  • Adjustment of an A TA value by a positive or a negative amount indicates advancing or delaying the uplink transmission timing for the TAG by a corresponding amount, respectively.
  • N and N 2 are determined with respect to the minimum SCS among the SCSs of all configured UL BWPs for all uplink carriers in the TAG and of all configured DL BWPs for the corresponding downlink carriers.
  • Lor m 0
  • Slot n and A s j” l rame ⁇ " are determined with respect to the minimum SCS among the SCSs of all configured UL BWPs for all uplink carriers in the TAG.
  • /V TA-max is determined with respect to the minimum
  • a UE changes an active UL BWP between a time of a timing advance command reception and a time of applying a corresponding adjustment for the uplink transmission timing
  • the UE determines the timing advance command value based on the SCS of the new active UL BWP. If the UE changes an active UL BWP after applying an adjustment for the uplink transmission timing, the UE assumes a same absolute timing advance command value before and after the active UL BWP change.
  • the UE changes N TA accordingly. If two adjacent slots overlap due to a TA command, the latter slot is reduced in duration relative to the former slot.
  • the indication field indicates one or more parameters related to the BS motion status, e.g. velocity, angle of motion.
  • the UE will use the indicated one or more parameters to derive the RTT variation between the BS and the UE. Then the UE will derive the TA adjustment based on the RTT variation.
  • the indication field indicates a resource allocation offset adjustment.
  • the resource allocation offset is used for the UE to determine the time domain resource allocation for the uplink transmission.
  • the resource allocation offset adjustment comprises a new value of the offset or an adjustment of the previously assigned offset value.
  • the UE will update the current used resource allocation offset based on the indicated offset adjustment for a next uplink transmission.
  • the UE needs a time interval between the moment when receiving the offset adjustment indication and the earliest uplink transmission with updated resource allocation offset.
  • the time interval is pre-configured or pre-defined.
  • the time interval depends on the UE capability, where UE can report capability 1 or capability 2 to the base station.
  • the time interval of UE capability 1 is smaller than the time interval of UE capability 2.
  • the time interval comprises amount of symbols or slots.
  • the UE derives a TA value by its own from some information, e.g. ephemeris data of the satellite. Thus, the base station does not know the exact value of the TA at UE side.
  • the UE may find the updated resource allocation offset does not cover the exact RTT or the exact TA. In this case, the UE will send an indication to the base station about a second adjustment of the resource allocation offset.
  • the indication of the second adjustment can be carried in at least one of the followings: PUCCH, PUSCH, SRS or PRACH.
  • the resource allocation offset comprises a first set of symbols or slots.
  • the adjustment of the resource allocation comprises a second set of symbols or slots with positive or negative sign, where positive sign indicates increasing the second set of symbols or slots, while negative sign indicates decreasing the second set of symbols or slots.
  • the second adjustment of the resource allocation comprises a third set of symbols or slots with positive or negative sign, where positive sign indicates increasing the third set of symbols or slots, while negative sign indicates decreasing the third set of symbols or slots.
  • the amount of the second set of symbols or slots is pre-configured or pre-defined.
  • the amount of the third set of symbols or slots is pre-configured or pre-defined.
  • FIG. 14 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. 14 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 multi-mode 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, a 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)
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  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil et un procédé pour un ajustement de transmission dans un réseau non terrestre (NTN). Un procédé d'ajustement de transmission d'un équipement utilisateur dans le NTN consiste à recevoir un indicateur de commande de liaison descendante (DCI) en provenance d'une station de base, le DCI comprenant un premier champ d'indication dans un premier emplacement ; et à obtenir le premier champ d'indication dans le premier emplacement, le premier champ d'indication indiquant des premières informations pertinentes pour un ajustement d'une transmission. Cela fournit un procédé sur la manière d'utiliser le DCI pour indiquer l'ajustement de transmission.
PCT/IB2020/000855 2020-06-19 2020-06-19 Appareil et procédé pour un ajustement de transmission dans un réseau non terrestre WO2021255491A1 (fr)

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