WO2023053298A1 - 端末及び通信方法 - Google Patents
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- WO2023053298A1 WO2023053298A1 PCT/JP2021/035987 JP2021035987W WO2023053298A1 WO 2023053298 A1 WO2023053298 A1 WO 2023053298A1 JP 2021035987 W JP2021035987 W JP 2021035987W WO 2023053298 A1 WO2023053298 A1 WO 2023053298A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H—ELECTRICITY
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- 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 invention relates to a terminal and communication method in a wireless communication system.
- NR New Radio
- LTE Long Term Evolution
- NTN Non-Terrestrial Network
- satellites artificial satellites
- the terminals are shared satellite orbit data from the base station. Based on the satellite orbit data and the position information obtained by the GNSS (Global Navigation Satellite System), the terminal calculates a value indicating the timing advance for the service link and pre-corrects the Doppler shift for frequency correction. Or post-correction can be performed.
- GNSS Global Navigation Satellite System
- a common TA and a terminal-specific TA are defined.
- the terminal updates the common TA based on the common TA parameters received from the base station and updates the terminal specific TA based on the satellite orbit parameters received from the base station.
- the reference time of the broadcast parameters should be known by the terminal. Therefore, a reference time for satellite orbital parameters is defined.
- the present invention has been made in view of the above points, and aims to realize accurate correction of time or frequency in a non-terrestrial network.
- a terminal that communicates with a base station via a satellite or an air vehicle, and in communication with the base station, sets a parameter for updating a timing advance value common to a plurality of terminals.
- a terminal is provided that includes a receiving unit that receives data from the base station, and a control unit that calculates the value of the timing advance based on the parameter, and in which the reference time of the parameter is specified.
- a technique that enables accurate correction of time or frequency in a non-terrestrial network.
- FIG. 1 is a first diagram for explaining a non-terrestrial network
- FIG. FIG. 4 is a second diagram for explaining a non-terrestrial network
- FIG. 13 is a third diagram for explaining the non-terrestrial network
- FIG. 14 is a fourth diagram for explaining the non-terrestrial network
- FIG. 10 is a diagram for explaining enhancement of timing advance
- FIG. 7 is a flowchart showing an example of the flow of timing advance calculation
- FIG. 10 is a diagram for explaining a conventional timing advance calculation method
- FIG. 10 is a first diagram for explaining reference times of common TA parameters according to Example 1-1
- FIG. 10 is a second diagram for explaining reference times of common TA parameters according to the embodiment 1-1
- FIG. 10 is a diagram for explaining the relationship between the reference time of the common TA parameter and the estimation of the common TA;
- FIG. 10 is a diagram for explaining a method of defining a reference time according to Option 1 of Example 1-3;
- FIG. 11 is a diagram for explaining a method of defining a reference time according to Option 2 of Example 1-3;
- FIG. 10 is a diagram for explaining a gap between two reference times according to Example 1-4;
- It is a figure showing an example of functional composition of a base station in an embodiment of the invention. It is a figure which shows an example of the functional structure of the terminal in embodiment of this invention. It is a figure showing an example of hardware constitutions of a base station or a terminal in an embodiment of the invention. It is a figure showing an example of composition of vehicles in an embodiment of the invention.
- existing technology may be used as appropriate.
- the existing technology is, for example, existing NR or LTE, but is not limited to existing NR or LTE.
- LTE Long Term Evolution
- LTE-Advanced and LTE-Advanced and subsequent systems eg, NR
- SS Synchronization signal
- PSS Primary SS
- SSS Secondary SS
- PBCH Physical broadcast channel
- PRACH Physical random access channel
- PDCCH Physical Downlink Control Channel
- PDSCH Physical Downlink Shared Channel
- PUCCH Physical Uplink Control Channel
- PUSCH Physical Uplink Shared Channel
- the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, Flexible Duplex etc.) method may be used.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- configure of wireless parameters and the like may mean that predetermined values are pre-configured (pre-configured).
- the wireless parameters notified from may be set.
- Fig. 1 is the first diagram for explaining the non-terrestrial network.
- a Non-Terrestrial Network uses non-terrestrial equipment such as satellites to provide services to areas that terrestrial 5G networks cannot cover mainly due to cost. .
- NTN can provide more reliable services. For example, it is assumed to be applied to IoT (Inter of things), ships, buses, trains, and critical communications. NTN also has scalability through efficient multicast or broadcast.
- a satellite 10A retransmits a signal transmitted from a terrestrial base station 10B to provide service to an area where no terrestrial base station is deployed, such as mountainous areas. can be done.
- a terrestrial 5G network includes one or more base stations 10 and terminals 20 .
- the base station 10 is a communication device that provides one or more cells and wirelessly communicates with the terminal 20 .
- a physical resource of a radio signal is defined in the time domain and the frequency domain.
- the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks.
- the base station 10 transmits synchronization signals and system information to the terminal 20 . Synchronization signals are, for example, NR-PSS and NR-SSS.
- the system information is transmitted by, for example, NR-PBCH, and is also called broadcast information.
- the base station 10 transmits control signals or data to the terminal 20 on DL (Downlink), and receives control signals or data from the terminal 20 on UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Also, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Also, both the base station 10 and the terminal 20 may communicate via SCell (Secondary Cell) and PCell (Primary Cell) by CA (Carrier Aggregation).
- SCell Secondary Cell
- PCell Primary Cell
- the terminal 20 is a communication device with a wireless communication function, such as a smartphone, mobile phone, tablet, wearable terminal, or M2M (Machine-to-Machine) communication module.
- the terminal 20 receives a control signal or data from the base station 10 on the DL and transmits the control signal or data to the base station 10 on the UL, thereby using various communication services provided by the wireless communication system.
- FIG. 2 is a second diagram for explaining the non-terrestrial network.
- the area per cell or beam in NTN is very large compared to terrestrial networks (Terrestrial Network, TN).
- FIG. 2 shows an example of an NTN composed of retransmissions by satellite.
- the connection between satellite 10A and NTN gateway 10B is called a feeder link, and the connection between satellite 10A and UE 20 is called a service link.
- the difference in delay between the near side UE 20A and the far side UE 20B is, for example, 10.3 ms for Geosynchronous orbit (GEO). , 3.2 ms in the case of LEO (Low Earth orbit).
- the beam size in NTN is, for example, 3500 km for GEO and 1000 km for LEO.
- FIG. 3 is a third diagram for explaining the non-terrestrial network.
- NTN is implemented by satellites in space or air vehicles in the air.
- a GEO satellite may be a satellite located at an altitude of 35,786 km and having a geostationary orbit.
- a LEO satellite may be a satellite located at an altitude of 500-2000 km and orbiting with a period of 88-127 minutes.
- HAPS High Altitude Platform Station
- HAPS High Altitude Platform Station
- GEO satellites, LEO satellites and HAPS air vehicles may be connected to ground stations gNB via gateways. Also, the service area may increase in order of HAPS, LEO, and GEO.
- NTN can extend the coverage of 5G networks to unserviced or serviced areas. Also, for example, NTN can improve service continuity, availability and reliability on ships, buses, trains or other critical communications. Note that the NTN may be notified by transmitting a dedicated parameter to the terminal 20, and the dedicated parameter is, for example, based on information related to the satellite or the aircraft. Related to TA (Timing Advance) determination It may be a parameter.
- FIG. 4 is a fourth diagram for explaining the non-terrestrial network.
- FIG. 4 shows an example of the NTN network architecture assumed for transparent payloads.
- CN Core Network
- gNB 10C Gateway 10B
- Gateway 10B is connected to satellite 10A via a feeder link.
- Satellite 10A is connected to terminal 20A or VSAT (Very small aperture terminal) 20B via a service link.
- NR Uu is established between gNB 10C and terminal 20A or VSAT 20B.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- terrestrial cells may be fixed or mobile.
- Terminal 20 may also have GNSS (Global Navigation Satellite System) capability.
- FR1 may assume a power class 3 handheld device.
- a VSAT device may also be assumed, at least in FR2.
- NTN's network architecture may assume a regenerative payload.
- gNB functionality may be onboard a satellite or air vehicle.
- the gNB-DU may be mounted on a satellite or air vehicle, and the gNB-CU may be deployed as a ground station.
- HARQ feedback may be disabled. If HARQ feedback is disabled, two consecutive DL transport blocks can be sent in one HARQ process without waiting for feedback.
- FIG. 5 is a diagram for explaining enhancement of timing advance.
- the downlink or uplink timing is adjusted only at the Reference Point (RP). That is, the RP is adjusted so that the timings of the downlink and the uplink are aligned.
- the RP is flexibly determined between the terrestrial base station 10C or gateway 10B and the satellite 10A or HAPS according to the network implementation.
- the terrestrial base station 10C and the gateway 10B are collectively referred to as the base station 10 below.
- the terminals 20A and VSAT 20B are collectively referred to as terminals 20 when not distinguished from each other.
- the RP in the base station 10 needs to broadcast information frequently via the feeder link for easy network implementation. Also, the RP in satellite 10A or HAPS requires backward compatibility of regenerated payload or ISL/IAL.
- the terminal 20A may calculate the timing advance value TA Full using the following formula.
- TA Full TA feeder link + TA service link
- the TA feeder link is the RTD (round trip delay) in the feeder link and is calculated by 2(T 0 +T 2 ).
- T2 is a value that indicates the timing advance compensated by the network and transparent to the user. T2 may be a constant to simplify implementation of the base station 10. FIG.
- T0 is a value that indicates the timing advance common to all users and is broadcast by the SIB. Note that the reference point may also be on the service link, in which case T0 will be a negative value.
- the TA service link is the RTD on the service link and is calculated by 2T1 .
- T1 is a terminal-specific TA and has a different value depending on the location of the terminal.
- FIG. 6 is a flowchart showing an example of the timing advance calculation flow.
- Terminal 20 calculates a value indicating the timing advance between the initial access and the RACH procedure.
- the base station 10 transmits an SSB (Synchronization Signal Block) to the terminal 20 (step S1).
- the terminal 20 performs time or frequency synchronization on the downlink and detects the MIB (Master Information Block) included in the SSB.
- MIB Master Information Block
- the base station 10 transmits CORESET (Control-resource set) #0 to the terminal 20.
- Terminal 20 detects the SIB (System Information Block) included in CORESET#0 and acquires the PRACH resource and common TA parameters.
- SIB System Information Block
- the terminal 20 transmits a preamble using the common TA determined from the parameters included in the SIB and the self-estimated terminal-specific TA (step S3).
- the preamble contains Msg1 or MsgA in the RACH procedure.
- the base station 10 transmits a RAR (Random Access Response) including a TAC (Timing Advance Command) to the terminal 20 (step S4).
- RAR with TAC includes Msg2 or MsgB in RACH procedure.
- the N TA is determined.
- Terminal 20 uses the common TA determined from the parameters contained in the SIB, the self-estimated terminal-specific TA and the TAC contained in the RAR for uplink synchronization.
- the reference time of the parameters broadcast by the terminal 20 is must be recognized. Therefore, a reference time for satellite orbital parameters is defined.
- FIG. 7 is a diagram for explaining a conventional timing advance calculation method.
- the satellite orbit data reference time Ty is implied by the downlink slot or frame start time.
- the terminal 20 can estimate the terminal-specific TA based on the satellite orbit data, the reference time, and the estimated time.
- the reference time Tx of the common TA is also important for estimating the common TA on the terminal side. Since the base station 10 transmits the same information in the SIB within a certain period of time, this problem cannot be solved on the base station side.
- the satellite propagation model is based on the terminal implementation.
- Tx', Ty', Tx'' and Ty'' may be related to the terminal implementation. This is because the terminal can estimate the common TA and the terminal-specific TA.
- Tx', Ty', Tx'' and Ty'' are not indicated by the base station 10 and can be determined by the terminal 20 for each implementation.
- Example 1 In this embodiment, a reference time for common TA parameters to be broadcast is defined.
- FIG. 8 is a first diagram for explaining the reference time of the common TA parameter according to Example 1-1.
- FIG. 9 is a second diagram for explaining the reference time of the common TA parameter according to the embodiment 1-1.
- the default reference time may be defined as the base station 10 broadcast time. That is, the reference time is the time indicated by point 901 in FIG. 8 and point 911 in FIG.
- the base station 10 may notify the terminal 20 of the broadcast time (reference time) together with the common TA parameter.
- the default reference time may be defined as the time the satellite 10A receives the broadcast common TA parameters or the time the satellite 10A transmits the broadcast common TA parameters to the terminal 20 . That is, the reference time is the time indicated by point 902 in FIG. 8 and point 912 in FIG.
- the terminal 20 can estimate the propagation delay between the satellite 10A and the terminal 20, it can estimate the reference time of the point 902 based on the implementation.
- the default reference time may be defined as the time at which terminal 20 receives the broadcast common TA parameters. That is, the reference time is the time indicated by point 903 in FIG. 8 and point 913 in FIG.
- the base station 10 informs the terminal 20 of the gap between the broadcast time at the base station 10 and the reception time at the satellite 10A, eg together with the common TA parameter.
- terminal 20 recognizes the propagation delay between the satellite 10A and the terminal 20.
- terminal 20 receives the overall propagation delay between base station 10 and terminal 20, i.e., the broadcast delay at base station 10.
- the gap between the time and the time of reception at terminal 20 can be calculated.
- a default reference time may be defined as the reception time at the reference point (RP). That is, the reference time is the time indicated by point 904 in FIG. 8 and point 914 in FIG.
- the base station 10 can know the total propagation delay between the base station 10 and the reference point. This option is applicable to both terminals with GNSS capability and terminals without GNSS capability.
- the reference point may be the same reference point for terminal-specific TA determination in a terminal without GNSS capability.
- the reference time in each option is defined by the start time of at least one of downlink symbols, subslots, slots, subframes and frames (radio frames).
- FIG. 10 is a diagram for explaining the relationship between the reference time of the common TA parameter and the estimation of the common TA.
- a dotted line 921 indicates the upper limit of the TA error, which is the value of CP/4 when the SCS is 15 kHz.
- a polygonal line 922 indicates the TA error when the valid period of the common TA parameter is 4 s and the reference time is 0.
- a polygonal line 923 indicates the TA error when the valid period of the common TA parameter is 4 s and the reference time is T/4.
- a polygonal line 924 indicates the TA error when the valid period of the common TA parameter is 4 s and the reference time is T/2.
- a polygonal line 925 indicates the TA error when the valid period of the common TA parameter is 4 s and the reference time is 3T/4.
- the reference times of the common TA parameters are different, the occurrence of TA errors in one effective period may be different.
- the reference time of the common TA parameter affects common TA estimation in terminal 20 .
- the base station 10 may define a flexible reference time and explicitly notify the terminal 20 of the defined reference time. For example, the base station 10 may notify the terminal 20 of the reference time of the common TA parameter together with the common TA parameter.
- a set of possible reference times is predefined, and the base station 10 may inform the terminal 20 of the index of the predefined set of reference times.
- the base station 10 may notify the terminal 20 of index 0, for example.
- the offset value may or may not be related to the valid period of the common TA parameter.
- a reference time for the common TA parameters may be defined relative to the SIB.
- the terminal 20 uses the reference time of the common TA parameters defined in Examples 1-1 and 1-2. good too.
- the terminal 20 sets the reference time of the common TA parameters defined in Examples 1-1 and 1-2. , SIB-based information.
- a fixed or flexible reference time for the common TA parameters shown in Example 1-1 or Example 1-2 may be defined for the first SIB transmission with constant update.
- FIG. 11 is a diagram for explaining the method of defining the reference time according to Option 1 of Example 1-3.
- the common TA is updated every four SIBs and the reference time of the common TA parameter is defined for the first SIB transmission.
- a fixed or flexible reference time for the common TA parameters shown in Example 1-1 or Example 1-2 may be defined for the updated n-th SIB transmission.
- FIG. 12 is a diagram for explaining the method of defining the reference time according to Option 2 of Example 1-3.
- the common TA is updated every four SIBs and the reference time of the common TA parameter is defined for the second SIB transmission.
- the base station 10 may notify the terminal 20 of the SIB update periodicity and the relative offset n using each SIB.
- the values within the set may correspond to different SIB transmissions.
- the nth value in the set of reference times may correspond to the nth SIB transmission.
- Each combination of common TA parameter and reference time may correspond to one SIB.
- terminal 20 may consider relative gaps or offsets between multiple TA parameters and relative gaps or offsets between multiple reference times.
- the reference time may be defined as the gap between the actual reference time of the common TA parameter and the epoch time of the satellite orbital data.
- FIG. 13 is a diagram for explaining the gap between two reference times according to Example 1-4.
- Point 931 indicates the broadcast time of base station 10 .
- Point 932 indicates the time at which satellite 10A receives the broadcasted common TA parameters or the time at which satellite 10A transmits the broadcasted common TA parameters to terminal 20 .
- a point 933 indicates the time at which the terminal 20 receives the broadcast common TA parameter.
- the gap between the two reference times indicated by points 932 and 933 corresponds to terminal-specific TAs recognized by terminal 20 .
- the terminal 20 can implicitly calculate the reference time of the common TA parameter based on the reference time (epoch time) of the satellite orbit data and the terminal-specific TA.
- the reference time defined by the gap may be predefined as the default definition of the specification without further instructions.
- gaps are predefined as terminal-specific TAs. Then, using the estimated terminal-specific TA and the reference time (epoch time) of the satellite orbit data, the terminal 20 implicitly acquires the reference time of the common TA parameter.
- a reference time defined by a gap may be explicitly indicated by the base station 10 .
- the base station 10 may explicitly indicate the reference time for common TA parameters to the terminal 20 .
- Example 2 In this embodiment, the definition of the signaling method of the reference time of the broadcast common TA parameter will be described.
- New signaling may be defined in SIB, RRC or MAC-CE to indicate the reference time for broadcast common TA parameters.
- a common TA parameter may be defined in SIB, RRC or MAC-CE to include the reference time.
- common TA parameters may be defined as follows. ⁇ Common TA ⁇ Rate of change of common TA ⁇ (Optional) Higher-order derived information of common TA ⁇ Reference time of common TA
- Multiple common TA parameters and reference times may be defined in SIB, RRC or MAC-CE.
- three sets of common TA parameters and reference times may be defined as follows.
- three sets of parameters including relative gaps may be defined.
- Set 1 ⁇ common TA, rate of change of common TA, reference time of common TA ⁇
- Set 2 ⁇ common TA1, ⁇ common TA rate of change 1, ⁇ common TA reference time 1 ⁇ relative to set 1
- Set 3 ⁇ common TA2, ⁇ common TA rate of change 2, ⁇ common TA reference time 2 ⁇ for set 1 or set 2
- the reference time may be the absolute value of the downlink slot or frame start time.
- the reference time may be, for example, the start time of at least one of downlink symbols, subslots, slots, subframes, and frames (radio frames) at the transmission time at the base station 10 .
- the reference time may be the start time of at least one of downlink symbols, subslots, slots, subframes, and frames (radio frames) at the transmission time in satellite 10A.
- the reference time may be the start time of at least one of downlink symbols, subslots, slots, subframes, and frames (radio frames) at the reception time at the terminal 20 or reference point (RP).
- the reference time may be the relative value of the propagation delay between some links, for example between a base station and a satellite.
- the reference time is also the absolute value of the downlink slot or frame start time, which may have some offset, such as an offset related to the validity period. It can also be an index that indicates one or several predefined sets of reference times.
- the reference time may be a relative value that defines the gap between the reference time of the common TA and the reference time of the satellite orbit data.
- a UE Capability is defined as to whether to support signaling associated with a fixed, flexible or explicitly indicated reference time to signal its capabilities.
- UE Capability terminal capability
- UE Capability the terminal capability
- UE Capability the terminal capability
- UE Capability the terminal capability
- UE Capability Information indicating whether or not the flexible reference time of the common TA parameter is supported may be defined as the terminal capability (UE Capability).
- the explicitly indicated reference time may be a direct indication of the reference time or an index of the reference time within a predefined set.
- UE Capability terminal capability
- the terminal may notify the terminal capability to the base station using higher layer parameters such as RRC and MAC-CE. Based on the notification of the terminal capability, the base station may determine the method of determining and notifying the reference time of the common TA parameter and the terminal to be notified via RRC or MAC-CE.
- the base stations 10 and terminals 20 contain the functionality to implement the embodiments described above. However, each of the base station 10 and the terminal 20 may have only the functions proposed in any of the embodiments.
- FIG. 14 is a diagram showing an example of the functional configuration of the base station 10.
- the base station 10 has a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140.
- the functional configuration shown in FIG. 14 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
- the transmitting unit 110 and the receiving unit 120 may be called a communication unit.
- the transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal.
- the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals.
- the transmitting unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, DL data, etc. to the terminal 20 . Also, the transmission unit 110 transmits the setting information and the like described in the embodiment.
- the setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in the storage device, and reads them from the storage device as necessary.
- the control unit 140 performs overall control of the base station 10 including control related to signal transmission/reception, for example. It should be noted that the functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110 , and the functional unit related to signal reception in control unit 140 may be included in receiving unit 120 . Also, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.
- FIG. 15 is a diagram showing an example of the functional configuration of the terminal 20.
- the terminal 20 has a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240.
- the functional configuration shown in FIG. 15 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
- the transmitting unit 210 and the receiving unit 220 may be called a communication unit.
- the transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
- the receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. Also, the transmitting unit 210 transmits HARQ-ACK, and the receiving unit 220 receives the setting information and the like described in the embodiment.
- the setting unit 230 stores various types of setting information received from the base station 10 by the receiving unit 220 in the storage device, and reads them from the storage device as necessary.
- the setting unit 230 also stores preset setting information.
- the control unit 240 performs overall control of the terminal 20 including control related to signal transmission/reception. It should be noted that the functional unit related to signal transmission in control unit 240 may be included in transmitting unit 210 , and the functional unit related to signal reception in control unit 240 may be included in receiving unit 220 . Also, the transmitting section 210 and the receiving section 220 may be called a transmitter and a receiver, respectively.
- the terminal of this embodiment may be configured as a terminal shown in each section below. Also, the following communication methods may be implemented.
- a terminal that communicates with a base station via a satellite or an air vehicle, a receiving unit that receives from the base station a parameter for updating a timing advance value common to a plurality of terminals in communication with the base station; a control unit that calculates the value of the timing advance based on the parameter, a reference time for said parameter is defined; terminal.
- the reference time of the parameter is defined as a fixed value, A terminal according to Clause 1.
- the receiving unit receives information indicating a reference time at which the parameter is defined from the base station.
- the reference time of the parameter is predefined in relation to information transmitted from the base station; A terminal according to Clause 1.
- the reference time of the parameter is defined as the gap between the actual reference time of the parameter and the reference time of the satellite orbital data; A terminal according to Clause 1.
- the reference time of the parameter can be clearly defined as a fixed value.
- the reference time of the parameter can be defined in relation to the SIB or the like.
- it can be defined as the gap between the actual reference time of the parameter and the reference time of the satellite orbit data.
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't
- a functional block (component) that performs transmission is called a transmitting unit or transmitter.
- the implementation method is not particularly limited.
- the base station 10, the terminal 20, etc. may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 16 is a diagram illustrating an example of hardware configurations of the base station 10 and the terminal 20 according to an embodiment of the present disclosure.
- the base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good too.
- the term "apparatus” can be read as a circuit, device, unit, or the like.
- the hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .
- the processor 1001 for example, operates an operating system and controls the entire computer.
- the processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- the control unit 140 , the control unit 240 and the like described above may be implemented by the processor 1001 .
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the program a program that causes a computer to execute at least part of the operations described in the above embodiments is used.
- control unit 140 of base station 10 shown in FIG. 14 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 .
- the control unit 240 of the terminal 20 shown in FIG. 15 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001 .
- FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.
- the storage device 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured.
- the storage device 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.
- the auxiliary storage device 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like.
- the storage medium described above may be, for example, a database, server, or other suitable medium including at least one of storage device 1002 and secondary storage device 1003 .
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD).
- FDD frequency division duplex
- TDD time division duplex
- the transceiver may be physically or logically separate implementations for the transmitter and receiver.
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the terminal 20 include hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays). , and part or all of each functional block may be implemented by the hardware.
- processor 1001 may be implemented using at least one of these pieces of hardware.
- a vehicle 2001 includes a drive section 2002, a steering section 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control section 2010, and various sensors 2021 to 2029. , an information service unit 2012 and a communication module 2013 .
- Each aspect/embodiment described in the present disclosure may be applied to a communication device mounted on vehicle 2001, and may be applied to communication module 2013, for example.
- the driving unit 2002 is configured by, for example, an engine, a motor, or a hybrid of the engine and the motor.
- the steering unit 2003 includes at least a steering wheel (also referred to as steering wheel), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.
- the electronic control unit 2010 is composed of a microprocessor 2031 , a memory (ROM, RAM) 2032 and a communication port (IO port) 2033 . Signals from various sensors 2021 to 2029 provided in the vehicle 2001 are input to the electronic control unit 2010 .
- the electronic control unit 2010 may also be called an ECU (Electronic Control Unit).
- the signals from the various sensors 2021 to 2029 include the current signal from the current sensor 2021 that senses the current of the motor, the rotation speed signal of the front and rear wheels acquired by the rotation speed sensor 2022, and the front wheel acquired by the air pressure sensor 2023. and rear wheel air pressure signal, vehicle speed signal obtained by vehicle speed sensor 2024, acceleration signal obtained by acceleration sensor 2025, accelerator pedal depression amount signal obtained by accelerator pedal sensor 2029, brake pedal sensor 2026 obtained by There are a brake pedal depression amount signal, a shift lever operation signal acquired by the shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028, and the like.
- the information service unit 2012 includes various devices such as car navigation systems, audio systems, speakers, televisions, and radios for providing various types of information such as driving information, traffic information, and entertainment information, and one or more devices for controlling these devices. ECU.
- the information service unit 2012 uses information acquired from an external device via the communication module 2013 or the like to provide passengers of the vehicle 2001 with various multimedia information and multimedia services.
- Driving support system unit 2030 includes millimeter wave radar, LiDAR (Light Detection and Ranging), camera, positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, automatic driving vehicle (AV) map, etc. ), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, AI processors, etc., to prevent accidents and reduce the driver's driving load. and one or more ECUs for controlling these devices.
- the driving support system unit 2030 transmits and receives various information via the communication module 2013, and realizes a driving support function or an automatic driving function.
- the communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via communication ports.
- the communication module 2013 communicates with the vehicle 2001 through the communication port 2033, the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, the axle 2009, the electronic Data is transmitted and received between the microprocessor 2031 and memory (ROM, RAM) 2032 in the control unit 2010 and the sensors 2021-29.
- the communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from an external device via wireless communication.
- Communication module 2013 may be internal or external to electronic control unit 2010 .
- the external device may be, for example, a base station, a mobile station, or the like.
- the communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to an external device via wireless communication.
- the communication module 2013 receives the rotation speed signal of the front and rear wheels obtained by the rotation speed sensor 2022, the air pressure signal of the front and rear wheels obtained by the air pressure sensor 2023, and the vehicle speed sensor. 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, and a shift lever.
- a shift lever operation signal obtained by the sensor 2027 and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 2028 are also transmitted to an external device via wireless communication.
- the communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from external devices, and displays it on the information service unit 2012 provided in the vehicle 2001 .
- Communication module 2013 also stores various information received from external devices in memory 2032 available to microprocessor 2031 .
- the microprocessor 2031 controls the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, and the axle 2009 provided in the vehicle 2001.
- sensors 2021 to 2029 and the like may be controlled.
- the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
- the processing order may be changed as long as there is no contradiction.
- the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of explanation of processing, such devices may be implemented in hardware, software, or a combination thereof.
- the software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are stored in random access memory (RAM), flash memory, read-only memory, respectively. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.
- notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods.
- notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
- RRC signaling may also be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.
- Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system) system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer, a decimal number)), FRA (Future Radio Access), NR (new Radio), New radio access ( NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802 .16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems, and any extensions, modifications, creations, and provisions based on these systems. It may be applied to
- a specific operation performed by the base station 10 in this specification may be performed by its upper node in some cases.
- various operations performed for communication with terminal 20 may be performed by base station 10 and other network nodes other than base station 10 (eg, but not limited to MME or S-GW).
- base station 10 e.g, but not limited to MME or S-GW
- the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).
- Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.
- Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.
- the determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean value (Boolean: true or false), or may be performed by comparing numerical values (e.g. , comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.
- wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- the channel and/or symbols may be signaling.
- a signal may also be a message.
- a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
- system and “network” used in this disclosure are used interchangeably.
- information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information.
- radio resources may be indexed.
- base station BS
- radio base station base station
- base station fixed station
- NodeB nodeB
- eNodeB eNodeB
- gNodeB gNodeB
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH:
- RRH indoor small base station
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems serving communication services in this coverage.
- MS Mobile Station
- UE User Equipment
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
- At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an IoT (Internet of Things) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.)
- the terminal 20 may have the functions of the base station 10 described above.
- words such as "up” and “down” may be replaced with words corresponding to inter-terminal communication (for example, "side”).
- uplink channels, downlink channels, etc. may be read as side channels.
- user terminals in the present disclosure may be read as base stations.
- the base station may have the functions that the above-described user terminal has.
- determining and “determining” used in this disclosure may encompass a wide variety of actions.
- “Judgement” and “determination” are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as “judged” or “determined”, and the like.
- "judgment” and “determination” are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgement” or “decision” has been made.
- judgment and “decision” are considered to be “judgment” and “decision” by resolving, selecting, choosing, establishing, comparing, etc. can contain.
- judgment and “decision” may include considering that some action is “judgment” and “decision”.
- judgment (decision) may be read as “assuming”, “expecting”, “considering”, or the like.
- connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being “connected” or “coupled.” Couplings or connections between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as "access”.
- two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.
- the reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.
- RS Reference Signal
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.
- a radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be of a fixed length of time (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
- SCS subcarrier spacing
- TTI transmission time interval
- transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain.
- a slot may be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (or PUSCH) mapping type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.
- one subframe may be called a Transmission Time Interval (TTI)
- TTI Transmission Time Interval
- TTI Transmission Time Interval
- TTI Transmission Time Interval
- one slot or one minislot may be called a TTI.
- TTI Transmission Time Interval
- at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each terminal 20
- TTI is not limited to this.
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the numerology, and may be 12, for example.
- the number of subcarriers included in an RB may be determined based on numerology.
- the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long.
- One TTI, one subframe, etc. may each consist of one or more resource blocks.
- One or more RBs are physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. may be called.
- PRBs physical resource blocks
- SCGs sub-carrier groups
- REGs resource element groups
- PRB pairs RB pairs, etc. may be called.
- a resource block may be composed of one or more resource elements (RE: Resource Element).
- RE Resource Element
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a bandwidth part (which may also be called a bandwidth part) may represent a subset of contiguous common resource blocks (RBs) for a certain numerology on a certain carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP).
- UL BWP UL BWP
- DL BWP DL BWP
- One or more BWPs may be configured for terminal 20 within one carrier.
- At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a given signal/channel outside the active BWP.
- “cell”, “carrier”, etc. in the present disclosure may be read as "BWP”.
- radio frames, subframes, slots, minislots and symbols described above are only examples.
- the number of subframes contained in a radio frame the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.
- CP cyclic prefix
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
- notification of predetermined information is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.
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Abstract
Description
本実施の形態では、共通TAパラメータの基準時刻をどのように規定するか。また、基準時刻は端末にどのように示されるか、または認識されるかを提示する。以下、本実施の形態の具体的な実施例として実施例1から実施例3までについて説明する。
本実施例では、ブロードキャストされる共通TAパラメータの基準時刻が規定される。
共通TAパラメータのデフォルトまたは固定の基準時刻が規定されてもよい。
デフォルトの基準時刻は、基地局10のブロードキャスト時刻として規定されてもよい。すなわち、基準時刻は、図8の点901および図9の点911に示される時刻である。
デフォルトの基準時刻は、衛星10Aがブロードキャストされる共通TAパラメータを受信する時刻または、衛星10Aがブロードキャストされる共通TAパラメータを端末20に送信する時刻として規定されてもよい。すなわち、基準時刻は、図8の点902および図9の点912に示される時刻である。
デフォルトの基準時刻は、端末20がブロードキャストされる共通TAパラメータを受信する時刻として規定されてもよい。すなわち、基準時刻は、図8の点903および図9の点913に示される時刻である。
代替案1では、基準時刻についてはこれ以上の改良がない。この場合、TAの誤差が発生する可能性がある。
代替案2では、基地局10は、基地局10でのブロードキャスト時刻と衛星10Aでの受信時刻との間のギャップを、例えば共通TAパラメータとともに端末20に通知する。
デフォルトの基準時刻は、基準点(RP)での受信時刻として規定されてもよい。すなわち、基準時刻は、図8の点904および図9の点914に示される時刻である。
共通TAパラメータの柔軟な基準時刻が規定されてもよい。
基地局10は、柔軟な基準時刻を規定し、規定された基準時刻を端末20に明示的に通知してもよい。例えば、基地局10は、共通TAパラメータの基準時刻を、共通TAパラメータとともに端末20に通知してもよい。
可能な基準時刻のセットをあらかじめ定義され、基地局10は、事前定義されたセットの基準時刻のインデックスを端末20に通知してもよい。
共通TAパラメータの同じセットが更新なしで複数のSIB送信を介してブロードキャストされる場合、共通TAパラメータの基準時刻がSIBに関連して定義されてもよい。
実施例1-1または実施例1-2に示される共通TAパラメータの固定または柔軟な基準時刻は、常に更新を伴う第一のSIB送信のために規定されるものとしてもよい。
実施例1-1または実施例1-2に示される共通TAパラメータの固定または柔軟な基準時刻は、更新後のn番目のSIB送信のために規定されるものとしてもよい。
実施例1-2のセット内の柔軟な基準時刻の場合、セット内の値は異なるSIB送信に対応してもよい。たとえば、基準時刻のセット内のn番目の値は、n番目のSIB送信に対応してもよい。
複数の共通TAパラメータと複数の基準時刻を定義してもよい。さらに、共通TAパラメータと基準時刻のそれぞれの組み合わせは、1つのSIBに対応するものとしてもよい。なお、端末20は、複数のTAパラメータ間の相対的なギャップまたはオフセットと、複数の基準時刻の間の相対的なギャップまたはオフセットと、を考慮してもよい。
基準時刻は、共通TAパラメータの実際の基準時刻と衛星軌道データの基準時刻(Epoch time)との間のギャップとして規定されてもよい。
ギャップによって定義された基準時刻は、追加の指示なしに、仕様のデフォルト定義として事前に定義されてもよい。
ギャップによって定義される基準時刻は、基地局10によって明示的に示されてもよい。
本実施例では、ブロードキャストされる共通TAパラメータの基準時刻のシグナリング方法の定義について説明する。
SIB、RRCまたはMAC-CEで新しいシグナリングを定義して、ブロードキャストされた共通TAパラメータの基準時刻を示してもよい。
基準時刻を含めるために、SIB、RRCまたはMAC-CEで共通TAパラメータを定義してもよい。たとえば、共通TAパラメータを次のように定義してもよい。
・共通TA
・共通TAの変化率
・(オプション)共通TAの高次の派生情報
・共通TAの基準時刻
SIB、RRCまたはMAC-CEで複数の共通TAパラメータと基準時刻とを定義してもよい。
セット2:{共通TA2、共通TAの変化率2、共通TA2の基準時刻2}
セット3:{共通TA3、共通TAの変化率3、共通TA3の基準時刻3}
セット2:セット1に対する{Δ共通TA1、Δ共通TAの変化率1、Δ共通TAの基準時刻1}
セット3:セット1またはセット2に対する{Δ共通TA2、Δ共通TAの変化率2、Δ共通TAの基準時刻2}
固定、柔軟または明示的に示された基準時刻と関連するシグナリングをサポートしてその機能を通知するかどうかについて、端末能力(UE Capability)を定義する。
次に、これまでに説明した処理及び動作を実行する基地局10及び端末20の機能構成例を説明する。基地局10及び端末20は上述した実施例を実行する機能を含む。ただし、基地局10及び端末20はそれぞれ、実施例のうちのいずれかの提案の機能のみを備えることとしてもよい。
図14は、基地局10の機能構成の一例を示す図である。図14に示されるように、基地局10は、送信部110と、受信部120と、設定部130と、制御部140とを有する。図14に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実行できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。送信部110と受信部120とを通信部と呼んでもよい。
図15は、端末20の機能構成の一例を示す図である。図15に示されるように、端末20は、送信部210と、受信部220と、設定部230と、制御部240とを有する。図15に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実行できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。送信部210と受信部220とを通信部と呼んでもよい。
(第1項)
衛星または飛行体を中継して基地局と通信する端末であって、
前記基地局との通信において、複数の端末に共通するタイミングアドバンスの値を更新するためのパラメータを前記基地局から受信する受信部と、
前記パラメータに基づいて前記タイミングアドバンスの値を算出する制御部と、を備え、
前記パラメータの基準時刻が規定されている、
端末。
(第2項)
前記パラメータの基準時刻は、固定値として規定されている、
第1項に記載の端末。
(第3項)
前記受信部は、前記パラメータの規定された基準時刻を示す情報を前記基地局から受信する、
第1項に記載の端末。
(第4項)
前記パラメータの基準時刻は、前記基地局から送信される情報に関連してあらかじめ定義される、
第1項に記載の端末。
(第5項)
前記パラメータの基準時刻は、前記パラメータの実際の基準時刻と衛星軌道データの基準時刻との間のギャップとして規定される、
第1項に記載の端末。
(第6項)
衛星または飛行体を中継して基地局と通信する端末が実行する通信方法であって、
前記基地局との通信において、複数の端末に共通するタイミングアドバンスの値を更新するためのパラメータを前記基地局から受信するステップと、
前記パラメータに基づいて前記タイミングアドバンスの値を算出するステップと、を備え、
前記パラメータの基準時刻が規定されている、
通信方法。
上記実施形態の説明に用いたブロック図(図14及び図15)は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
以上、本発明の実施の形態を説明してきたが、開示される発明はそのような実施形態に限定されず、当業者は様々な変形例、修正例、代替例、置換例等を理解するであろう。発明の理解を促すため具体的な数値例を用いて説明がなされたが、特に断りのない限り、それらの数値は単なる一例に過ぎず適切な如何なる値が使用されてもよい。上記の説明における項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。機能ブロック図における機能部又は処理部の境界は必ずしも物理的な部品の境界に対応するとは限らない。複数の機能部の動作が物理的には1つの部品で行われてもよいし、あるいは1つの機能部の動作が物理的には複数の部品により行われてもよい。実施の形態で述べた処理手順については、矛盾の無い限り処理の順序を入れ替えてもよい。処理説明の便宜上、基地局10及び端末20は機能的なブロック図を用いて説明されたが、そのような装置はハードウェアで、ソフトウェアで又はそれらの組み合わせで実現されてもよい。本発明の実施の形態に従って基地局10が有するプロセッサにより動作するソフトウェア及び本発明の実施の形態に従って端末20が有するプロセッサにより動作するソフトウェアはそれぞれ、ランダムアクセスメモリ(RAM)、フラッシュメモリ、読み取り専用メモリ(ROM)、EPROM、EEPROM、レジスタ、ハードディスク(HDD)、リムーバブルディスク、CD-ROM、データベース、サーバその他の適切な如何なる記憶媒体に保存されてもよい。
10A 衛星
10B ゲートウェイ
10C 地上基地局
10D CN
10E 飛行体
110 送信部
120 受信部
130 設定部
140 制御部
20 端末
210 送信部
220 受信部
230 設定部
240 制御部
30 コアネットワーク
1001 プロセッサ
1002 記憶装置
1003 補助記憶装置
1004 通信装置
1005 入力装置
1006 出力装置
2001 車両
2002 駆動部
2003 操舵部
2004 アクセルペダル
2005 ブレーキペダル
2006 シフトレバー
2007 前輪
2008 後輪
2009 車軸
2010 電子制御部
2012 情報サービス部
2013 通信モジュール
2021 電流センサ
2022 回転数センサ
2023 空気圧センサ
2024 車速センサ
2025 加速度センサ
2026 ブレーキペダルセンサ
2027 シフトレバーセンサ
2028 物体検出センサ
2029 アクセルペダルセンサ
2030 運転支援システム部
2031 マイクロプロセッサ
2032 メモリ(ROM,RAM)
2033 通信ポート(IOポート)
Claims (6)
- 衛星または飛行体を中継して基地局と通信する端末であって、
前記基地局との通信において、複数の端末に共通するタイミングアドバンスの値を更新するためのパラメータを前記基地局から受信する受信部と、
前記パラメータに基づいて前記タイミングアドバンスの値を算出する制御部と、を備え、
前記パラメータの基準時刻が規定されている、
端末。 - 前記パラメータの基準時刻は、固定値として規定されている、
請求項1に記載の端末。 - 前記受信部は、前記パラメータの規定された基準時刻を示す情報を前記基地局から受信する、
請求項1に記載の端末。 - 前記パラメータの基準時刻は、前記基地局から送信される情報に関連してあらかじめ定義される、
請求項1に記載の端末。 - 前記パラメータの基準時刻は、前記パラメータの実際の基準時刻と衛星軌道データの基準時刻との間のギャップとして規定される、
請求項1に記載の端末。 - 衛星または飛行体を中継して基地局と通信する端末が実行する通信方法であって、
前記基地局との通信において、複数の端末に共通するタイミングアドバンスの値を更新するためのパラメータを前記基地局から受信するステップと、
前記パラメータに基づいて前記タイミングアドバンスの値を算出するステップと、を備え、
前記パラメータの基準時刻が規定されている、
通信方法。
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