WO2022027628A1 - Procédé et appareil de détermination d'avance temporelle de liaison montante, et dispositif et support de stockage - Google Patents

Procédé et appareil de détermination d'avance temporelle de liaison montante, et dispositif et support de stockage Download PDF

Info

Publication number
WO2022027628A1
WO2022027628A1 PCT/CN2020/107923 CN2020107923W WO2022027628A1 WO 2022027628 A1 WO2022027628 A1 WO 2022027628A1 CN 2020107923 W CN2020107923 W CN 2020107923W WO 2022027628 A1 WO2022027628 A1 WO 2022027628A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
offset value
serving cell
positioning capability
uplink
Prior art date
Application number
PCT/CN2020/107923
Other languages
English (en)
Chinese (zh)
Inventor
胡奕
李海涛
徐伟杰
Original Assignee
Oppo广东移动通信有限公司
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 Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2020/107923 priority Critical patent/WO2022027628A1/fr
Priority to CN202080104679.2A priority patent/CN116210289A/zh
Publication of WO2022027628A1 publication Critical patent/WO2022027628A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a method, apparatus, device, and storage medium for determining uplink timing advance (TA).
  • TA uplink timing advance
  • the NR system supports the mechanism of uplink timing advance. Time alignment of uplink transmissions of terminals with different frequency domain resources arriving at the network side.
  • a terminal does not perform TA compensation when sending uplink messages during random access and when sending uplink transmissions in an RRC (Radio Resource Control, Radio Resource Control) connected state.
  • RRC Radio Resource Control, Radio Resource Control
  • NTN Non Terrestrial Network, non-terrestrial communication network
  • a mechanism for the terminal to compensate the TA for sending uplink messages and uplink transmissions is introduced, and the terminal can directly use its own TA based on positioning capability estimation to send uplink messages and uplink transmissions.
  • the TA estimated by the terminal may be larger or smaller than the actual TA of the terminal.
  • the time for the uplink message or uplink transmission sent by the terminal to reach the network side will be advanced, which will affect the network.
  • the uplink signal reception or downlink signal transmission of the previous symbol on the side causes interference, which affects the reception performance of the network side.
  • the embodiments of the present application provide a method, apparatus, device, and storage medium for determining an uplink TA, which can effectively avoid the occurrence of the terminal overcompensating the TA. Therefore, the network side will not receive the uplink signal of the previous symbol or send the downlink signal. Causes interference and ensures the signal reception performance on the network side.
  • the technical solution is as follows:
  • a method for determining uplink timing advance TA is provided, which is applied in a terminal, and the method includes:
  • the TA offset value is used to indicate the offset of the round-trip delay of signal propagation between the terminal and the serving cell base station
  • the TA estimated value The value is the round-trip delay of signal propagation between the terminal and the serving cell satellite as estimated by the terminal based on positioning capabilities.
  • a method for determining uplink timing advance TA is provided, which is applied to a serving cell base station, and the method includes:
  • a TA offset value is sent to the terminal, where the TA offset value is used to instruct the terminal to determine the first TA according to the TA offset value.
  • an apparatus for determining an uplink timing advance TA includes:
  • a determining module configured to determine a first TA according to a TA offset value and a TA estimated value, where the TA offset value is used to indicate the offset situation of the round-trip delay of signal propagation between the terminal and the serving cell base station,
  • the TA estimated value is the round-trip delay of signal propagation between the terminal and the serving cell satellite estimated by the terminal based on the positioning capability.
  • an apparatus for determining an uplink timing advance TA includes:
  • a sending module configured to send a TA offset value to the terminal, where the TA offset value is used to instruct the terminal to determine the first TA according to the TA offset value.
  • a terminal in another aspect, includes a processor and a memory, the memory stores at least one instruction, and the at least one instruction is used to be executed by the processor to implement any of the above-mentioned aspects.
  • the determination method of the uplink TA includes a processor and a memory, the memory stores at least one instruction, and the at least one instruction is used to be executed by the processor to implement any of the above-mentioned aspects.
  • a network device which can be a serving cell base station, the network device includes a processor and a memory, the memory stores at least one instruction, and the at least one instruction is used to be executed by the processor to The method for determining an uplink TA described in any one of the above aspects is implemented.
  • a computer-readable storage medium where instructions are stored on the computer-readable storage medium, and when the instructions are executed by a processor, the method for determining an uplink TA described in any one of the foregoing aspects is implemented.
  • a computer program product containing instructions, which, when executed on a computer, cause the computer to execute the method for determining an uplink TA described in any one of the above aspects.
  • the TA offset value is introduced in the process of determining the uplink TA of the terminal, which avoids the situation that the terminal overcompensates the TA due to the error of positioning accuracy. Therefore, it will not cause interference to the network side receiving the uplink signal of the previous symbol or sending the downlink signal. The signal reception performance on the network side is guaranteed.
  • FIG. 1 is a schematic diagram of an NTN scenario based on transparent transmission of payloads provided by an exemplary embodiment of the present application
  • FIG. 2 is a schematic diagram of an NTN scenario based on regeneration load provided by an exemplary embodiment of the present application
  • FIG. 3 is a schematic diagram of timing advance provided by an exemplary embodiment of the present application.
  • FIG. 5 is a schematic diagram of a round-trip delay of signal propagation provided by an exemplary embodiment of the present application.
  • FIG. 6 is a schematic diagram of timing advance adjustment provided by an exemplary embodiment of the present application.
  • FIG. 7 is a flowchart of a method for determining an uplink TA provided by an exemplary embodiment of the present application.
  • FIG. 8 is a flowchart of a first TA-based communication method provided by an exemplary embodiment of the present application.
  • FIG. 9 is a schematic diagram of adjustment of a first TA based on a four-step random access procedure provided by an exemplary embodiment of the present application.
  • FIG. 10 is a schematic diagram of adjustment of a first TA based on a two-step random access process provided by an exemplary embodiment of the present application.
  • FIG. 11 is a flowchart of a first TA-based communication method provided by another exemplary embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of an apparatus for determining an uplink TA provided by an exemplary embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of an apparatus for determining an uplink TA provided by another exemplary embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application.
  • Satellite communication is not limited by the user's geographical area. For example, general terrestrial communication cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be set up or cannot be covered due to sparse population. For satellite communication, due to a single Satellites can cover a large ground, and satellites can orbit around the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communication has great social value.
  • Satellite communications can be covered at low cost in remote mountainous areas and poor and backward countries or regions, so that people in these regions can enjoy advanced voice communication and mobile Internet technologies, which is conducive to narrowing the digital divide with developed regions and promoting development in these areas.
  • the satellite communication distance is long, and the communication cost does not increase significantly when the communication distance increases; finally, the satellite communication has high stability and is not limited by natural disasters.
  • Communication satellites are classified into LEO (Low-Earth Orbit, low earth orbit) satellites, MEO (Medium-Earth Orbit, medium earth orbit) satellites, GEO (Geostationary Earth Orbit, geosynchronous orbit) satellites, HEO (High Earth orbit) satellites according to the different orbital altitudes. Elliptical Orbit, high elliptical orbit) satellites, etc.
  • LEO Low-Earth Orbit, low earth orbit
  • MEO Medium-Earth Orbit, medium earth orbit
  • GEO Global-Earth Orbit, geosynchronous orbit
  • HEO High Earth orbit
  • the altitude range of low-orbit satellites is 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours.
  • the signal propagation delay of single-hop communication between users is generally less than 20ms.
  • the maximum satellite viewing time is 20 minutes.
  • the signal propagation distance is short, the link loss is small, and the transmit power requirements of the user terminal are not high.
  • the signal propagation delay of single-hop communication between users is generally 250ms.
  • satellites use multiple beams to cover the ground.
  • a satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover tens to hundreds of kilometers in diameter. ground area.
  • FIG. 1 shows a schematic diagram of an NTN scenario based on transparent transmission of payloads
  • FIG. 2 shows a schematic diagram of an NTN scenario based on regenerated payloads.
  • An NTN network consists of the following network elements:
  • Feeder Link The link used for communication between the gateway and the satellite
  • Service Link The link used for communication between the terminal and the satellite
  • ⁇ Satellite From the functions it provides, it can be divided into two types: transparent forwarding and regenerative forwarding.
  • ⁇ Transparent load It only provides the functions of radio frequency filtering, frequency conversion and amplification. It only provides transparent forwarding of the signal, and will not change the waveform signal it forwards.
  • ⁇ Regeneration load In addition to providing the functions of radio frequency filtering, frequency conversion and amplification, it can also provide functions of demodulation/decoding, routing/conversion, encoding/modulation. It has part or all of the functions of a base station.
  • Inter-satellite links, inter-satellite links exists in the NTN scenario of regeneration and forwarding.
  • An important feature of uplink transmission is that different terminals have orthogonal multiple access in time and frequency, that is, uplink transmissions of different terminals from the same cell do not interfere with each other.
  • network equipment such as: base station
  • network equipment requires uplink transmissions from terminals in the same time slot but different frequency domain resources to reach the network equipment
  • the time is basically aligned. Since the network device can correctly decode the uplink transmission sent by the terminal as long as it receives the uplink transmission sent by the terminal within the range of the CP (Cyclic Prefix), the network device requires the uplink transmission from the terminal in the same time slot but different frequency domain resources to reach the network device The time falls within the CP.
  • NR supports the mechanism of uplink timing advance.
  • TA is essentially a time slot offset value between receiving a downlink transmission and sending an uplink transmission.
  • the network device can control the time when uplink transmissions from different terminals arrive at the network device. For a terminal farther away from the network device, due to the larger round-trip delay of signal propagation, it is necessary to send the uplink transmission earlier than the terminal closer to the network device.
  • Figure 3 shows a schematic diagram of a timing advance.
  • the terminal when the terminal does not perform uplink timing advance, the uplink transmission from the terminal in the same time slot but with different frequency domain resources reaches the network device's The time difference is large.
  • the terminal when the terminal performs uplink timing advance, the time of the uplink transmission from the terminal in the same time slot but with different frequency domain resources arriving at the network device is basically aligned.
  • the network device may determine the TA value of the terminal by measuring the uplink transmission of the terminal. Furthermore, the network device sends the TA command to the terminal in the following two ways.
  • the network device can determine the TA value of the terminal by measuring the received preamble, and pass the TAC (Timing Advance Command) field in the RAR (Random Access Response) field. sent to the terminal.
  • TAC Transmission Advance Command
  • RAR Random Access Response
  • the terminal and the network device have achieved uplink synchronization, the time when the uplink transmission arrives at the network device may change.
  • the round-trip delay of signal propagation between the terminal and the network device is constantly changing. Therefore, the terminal needs to continuously update its TA value to maintain the uplink synchronization with the network equipment.
  • the network device may use a closed-loop mechanism to adjust the TA value. That is, the network device can determine the TA value of the terminal by measuring the uplink transmission of the terminal. Therefore, as long as the terminal has uplink transmission, the network equipment can be used to estimate the TA value.
  • any signal sent by the terminal can be used by the network device to measure the TA value, for example, the SRS (Sounding Reference Signal), DMRS (Demodulation Reference Signal, demodulation reference signal), CQI (Channel Quality Indication) sent by the terminal , channel quality indicator), ACK (Acknowledgment, positive acknowledgement)/NACK (Non-Acknowledgment, negative acknowledgement), PUSCH (Physical Uplink Control Channel, physical uplink shared channel), etc., can be used for network equipment to measure TA values.
  • SRS Sounding Reference Signal
  • DMRS Demodulation Reference Signal, demodulation reference signal
  • CQI Channel Quality Indication
  • ACK Acknowledgment, positive acknowledgement
  • NACK Non-Acknowledgment, negative acknowledgement
  • PUSCH Physical Uplink Control Channel, physical uplink shared channel
  • the network device will send a TAC to the terminal, requesting the terminal to adjust the TA value.
  • the TAC may be sent to the terminal through a MAC (Media Access Control, media access control) CE (Control Element, control unit).
  • the random access process generally includes the following four-step process.
  • Step 1 The terminal sends Msg1 to the network device, where the Msg1 is a random access preamble sequence (ie, a preamble).
  • the Msg1 is a random access preamble sequence (ie, a preamble).
  • the terminal sends Msg1 to the network device to notify the network device that there is a random access request, and at the same time enables the network device to estimate the transmission delay between itself and the terminal, and calibrate the uplink time accordingly.
  • the information of the resource for sending Msg1 may be obtained through the resource configuration of RACH (Random Access Channel, random access channel).
  • RACH resource configuration information configured for terminal access is defined, including 256 types, and a cell can indicate the RACH resource configuration information used by itself to the terminal in a system message.
  • Each RACH resource configuration information includes preamble format, period, radio frame offset, subframe number in radio frame, start symbol in subframe, number of PRACH time slots in subframe, PRACH timing in PRACH time slot The number of , and the duration of the PRACH opportunity.
  • the time, frequency, and code information of the PRACH resource can be determined through these information.
  • the terminal can send Msg1 on the corresponding PRACH resource according to the RACH resource configuration information indicated by the network device.
  • Step 2 After detecting the Msg1 sent by the terminal, the network device sends an RAR (Msg2) to the terminal to inform the terminal of uplink resource information that can be used when sending the next message (Msg3).
  • Msg2 an RAR
  • Msg3 uplink resource information that can be used when sending the next message
  • one RAR may include response messages to multiple terminals sending preambles, and the response message to each terminal includes the random access preamble identification field RAP ID used by each terminal, the resource allocation information of Msg3, TA information, etc.
  • the network device can also perform other operations, such as assigning a temporary RNTI (Radio Network Temporary Identity, wireless network temporary identity) to the terminal, etc., which will not be introduced here.
  • RNTI Radio Network Temporary Identity, wireless network temporary identity
  • Step 3 The terminal receives the RAR, and sends Msg3 to the network device on the uplink resource indicated by the RAR.
  • the terminal may monitor a PDCCH (Physical Downlink Control Channel, physical downlink control channel) in a search space within a RAR time window corresponding to the RAR to receive the RAR.
  • the RAR time window may be configured through high-layer parameters, and the configuration information of the search space of the PDCCH may be indicated through a system message.
  • the terminal does not receive the RAR sent by the network device within the RAR time window, it is considered that the random access procedure has failed. If the terminal receives a RAR, and the preamble index in the RAR is the same as the preamble index sent by the terminal, it is considered that the RAR has been successfully received. At this time, the terminal can stop monitoring the RAR, and the terminal sends Msg3 to the network device.
  • the Msg3 may carry a terminal-specific temporary identity information or a terminal identity from the core network.
  • the terminal identity may be S-TMSI (Serving-Temporary Mobile Subscriber Identity, temporary mobile subscriber identity) or a random number.
  • Step 4 After receiving the Msg3, the network device sends the Msg4 to the terminal.
  • the Msg4 includes a contention resolution message and also includes information about uplink transmission resources allocated for the terminal.
  • the network device will carry a unique flag in the Msg4 to indicate the terminal that wins the competition.
  • the terminal receives the Msg4 sent by the base station, it will detect whether the temporary identification information sent by the terminal in Msg3 is included in the contention resolution message sent by the network device. The random access procedure is initiated again from the first step.
  • NTN NTN will support two types of terminals, one is a terminal without initial TA compensation capability, that is, the terminal does not perform TA compensation when sending Msg1 in the random access process, the other The first is the terminal with the initial TA compensation capability, that is, the terminal uses the TA estimated by itself to send Msg1 in the random access process.
  • the TA determination method is different.
  • the network device will broadcast a common TA based on the round-trip delay of signal propagation between the ground reference point and the satellite.
  • the terminal sends Msg1
  • the public TA broadcasted by the network is used for TA compensation
  • the network device indicates a dedicated TA value to the terminal in the RAR, so that the terminal can accumulate the broadcasted public TA and the dedicated TA indicated to the terminal in the RAR, and obtain TA to use when sending Msg3.
  • the method for determining the common TA is shown in Figure 5.
  • the common TA 2*d0/c, where d0 refers to the ground reference point and the The distance between satellites, c refers to the speed of light.
  • TA 2*(d0+d0_F)/c, where d0 refers to the distance between the ground reference point and the satellite, and c refers to the distance between the ground reference point and the satellite. is the speed of light, and d0_F refers to the distance between the satellite and the ground base station.
  • the terminal estimates its own TA based on its own positioning capability, and sends Msg1 using the self-estimated TA.
  • the network device determines the TA adjustment value of the terminal, and indicates to the terminal through Msg2. Since the network device does not know the actual round-trip delay of signal propagation with the terminal at this time, the network device can schedule the Msg3 resources of the terminal according to the maximum uplink scheduling delay.
  • the terminal adjusts the TA based on the received RAR indication, and sends Msg3 on the uplink resource scheduled by the network device.
  • the network device can determine the actual round-trip delay of signal propagation with the terminal.
  • the RAR sent by the network device will include a UL grant field to indicate the uplink resources of Msg3.
  • the terminal sends Msg3 on the PUSCH resource indicated by the UL grant of the RAR.
  • the terminal will not estimate the TA by itself to perform TA compensation when sending the preamble in the random access process.
  • the estimated TA of the terminal may be larger or smaller than the actual value of the terminal. ta. If the TA estimated by the terminal is too large, the time when the preamble sent by the terminal reaches the network side will be earlier, which will interfere with the uplink signal reception or downlink signal transmission of the previous symbol on the network side, and affect the network side reception performance.
  • the TA of the terminal is completely determined and controlled by the network side.
  • NTN for a terminal in the RRC connection state, if the terminal compensates the TA by itself, if the estimated TA of the terminal is too large, the time when the terminal's uplink transmission reaches the network side will be advanced, so that the previous The uplink signal reception or downlink signal transmission of the symbol causes interference, which affects the reception performance of the network side.
  • a TA offset value is introduced in the embodiment of the present application to prevent the terminal from over-compensating TA so that the signal sent by the terminal causes interference to the signal of the previous symbol.
  • FIG. 7 is a flowchart of a method for determining an uplink TA according to an exemplary embodiment of the present application. The method can be applied to the terminal in the NTN scenario shown in FIG. 1 or FIG. 2 .
  • the method for determining an uplink TA Can include at least some of the following:
  • Step 710 Determine the first TA according to the TA offset value and the TA estimated value, the TA offset value is used to indicate the offset of the round-trip delay of signal propagation between the terminal and the serving cell base station, and the TA estimated value is the terminal The round-trip delay of signal propagation between the terminal and the serving cell satellite is estimated based on the positioning capability.
  • TA offset value is any of the following:
  • the common TA offset value is a TA offset value configured by the base station of the serving cell for the terminal in the serving cell according to the first positioning capability, and the first positioning capability is the positioning capability of at least one terminal in the serving cell.
  • the base station of the serving cell may determine the common TA offset value of the serving cell based on the positioning capability of any terminal in the serving cell. After that, all terminals in the serving cell use the common TA offset value when determining the first TA.
  • the base station of the serving cell may determine the common TA offset value of the serving cell based on the positioning capability of a terminal with the lowest positioning capability in the serving cell.
  • the base station of the serving cell determines an average value of the positioning capabilities based on the positioning capabilities of multiple terminals in the serving cell, and determines the common TA offset value of the serving cell according to the average value. After that, all terminals in the serving cell use the common TA offset value when determining the first TA.
  • the serving cell base station is configured with a common TA offset value for all cells within its own coverage.
  • the common TA offset values configured in different cells may be the same or different, which is not limited in this embodiment of the present application.
  • the TA offset value is sent by the base station of the serving cell to the terminal in the form of broadcast. That is, the terminal in the serving cell obtains the common TA offset value through cell broadcast, and the TA offset value used by each terminal in the serving cell when determining the first TA may be the above-mentioned common TA offset value.
  • the predefined TA offset value is a TA offset value that is pre-defined according to the second positioning capability, and the second positioning capability is the positioning capability of at least one terminal.
  • the predefined TA offset values may be the same or different.
  • the TA offset value is determined based on the positioning capability of at least one terminal.
  • a TA offset value shared by all terminals may be pre-defined based on the positioning capability of a certain terminal, or the positioning capability of the terminal with the lowest positioning capability. That is, the pre-defined TA offset value of each terminal is the same.
  • different TA offset values may also be defined for terminals with different positioning capabilities according to different positioning capabilities corresponding to multiple terminals, that is, the predefined TA offset corresponding to at least one terminal with the same positioning capability
  • the shift value is the same.
  • the dedicated TA offset value is a TA offset value configured by the base station of the serving cell for the terminal according to the third positioning capability, and the third positioning capability is the positioning capability of the terminal.
  • the serving cell base station configures a TA offset value most suitable for the terminal for each terminal.
  • the terminal reports its own positioning capability when sending a preamble in the random access process, and the serving cell base station determines the offset of the round-trip delay of signal propagation between the terminal and itself based on the positioning capability, Further, the terminal-specific TA offset value is determined.
  • the serving cell base station may determine the positioning capability of the terminal by measuring any uplink transmission of the terminal, and determine the terminal-specific TA offset value based on the positioning capability.
  • the serving cell base station can configure the terminal-specific TA offset value for terminals with different positioning capabilities.
  • the serving cell base station can also adjust the TA offset value at any time, and notify the terminal of the adjusted TA offset value.
  • the above-mentioned dedicated TA offset value can be sent to the terminal through the TAC field in the RAR during the random access process; or in the RRC connection state, the TAC can be sent to the terminal through the MAC CE.
  • the terminal notifies the terminal of the determined TA offset value; it may also be notified to the terminal through other proprietary signaling, broadcasting, etc., which is not limited in this embodiment of the present application.
  • the TA estimated value is estimated by the terminal according to the current location of the terminal and the first ephemeris information, and the first ephemeris information is the ephemeris information of the serving cell satellite.
  • the ephemeris information includes information such as the running track and running speed of the satellite, and the position of the satellite at each moment can be determined according to the ephemeris information.
  • the terminal has positioning capability and can determine its own location.
  • the terminal can store the first ephemeris information of the serving cell satellite.
  • the implementation process of estimating the TA estimated value is as follows: the terminal determines the location of the serving cell satellite according to the first ephemeris information, and further , determine the first distance between the serving cell satellite and its own location, and use the ratio between the first distance and the signal transmission rate as the signal propagation delay between the terminal and the serving cell satellite.
  • TA is essentially a time slot offset value between receiving a downlink transmission and sending an uplink transmission. Therefore, the estimated value of TA should reflect the round-trip delay of signal propagation between the terminal and the serving cell satellite.
  • the TA estimated value can be determined by the following formula (1).
  • TA_SL is the round-trip delay of signal propagation between the terminal and the serving cell satellite on the serving link
  • d1 is the first distance between the serving cell satellite and the current position of the terminal
  • v is the signal transmission rate.
  • v can also be replaced by the speed of light c.
  • the first TA is determined according to the TA offset value and the TA estimated value, including the following methods:
  • Manner 1 In the NTN scenario based on the regeneration load, determine the first difference between the TA estimated value and the TA offset value, and use the first difference as the first TA.
  • the first TA can be determined by the following formula (2).
  • TA1 TA_SL-TA_offset (2)
  • TA1 is the first TA
  • TA_SL is the round-trip delay of signal propagation between the terminal and the serving cell satellite on the serving link
  • TA_offset is the TA offset value
  • Mode 2 In the NTN scenario based on the transparent transmission load, and the terminal can obtain the second TA on the feeder link between the serving cell satellite and the serving cell base station, according to the TA estimated value, the TA offset value and the second TA , determine the first TA.
  • the implementation process of determining the first TA is: according to the TA estimated value and the second TA, determine the third TA, and the third TA is between the terminal and the serving cell base station estimated by the terminal based on the positioning capability. Then, a second difference between the third TA and the TA offset value is determined, and the second difference is used as the first TA. .
  • the first TA can be determined by the following formula (3).
  • TA1 TA_SL+TA2-TA_offset (3)
  • TA1 is the first TA
  • TA_SL is the round-trip delay of signal propagation between the terminal and the serving cell satellite on the serving link
  • TA2 is the round-trip delay of signal propagation between the serving cell satellite and the serving cell base station on the feeder link
  • TA_SL+ TA2 represents the above-mentioned third TA
  • TA_offset is the TA offset value.
  • the terminal determines the location of the serving cell satellite according to the first ephemeris information, and further determines the second distance between the serving cell satellite and the serving cell base station, and the ratio between the second distance and the signal transmission rate is Signal transmission delay between serving cell base station and serving cell satellite.
  • TA2 can be determined by the following formula (4).
  • TA_FL is the round-trip delay of signal propagation between the serving cell base station and the serving cell satellite on the feeder link, that is, the above TA2
  • d2 is the second distance between the serving cell satellite and the serving cell base station
  • v is the signal transmission rate .
  • v can also be replaced by the speed of light c.
  • Mode 3 In the NTN scenario based on the transparent transmission load, if the terminal cannot obtain the second TA on the feeder link between the serving cell satellite and the serving cell base station, determine the second TA between the TA estimated value and the TA offset value. A difference value, the first difference value is used as the first TA.
  • the first TA can be determined by the above formula (2).
  • the TA offset value is introduced in the process of determining the uplink TA of the terminal, so as to avoid the situation that the terminal overcompensates the TA due to the error of the positioning accuracy.
  • the uplink signal of the previous symbol or the transmitted downlink signal causes interference, which ensures the signal reception performance on the network side.
  • the terminal may use the first TA to communicate with the serving cell base station.
  • FIG. 8 is a flowchart of a first TA-based uplink communication method according to an exemplary embodiment of the present application.
  • the method can be applied in an NTN scenario, and the uplink communication method can be Include at least some of the following:
  • Step 810 The terminal determines the first TA according to the TA offset value and the TA estimated value.
  • the TA offset value is used to indicate the offset of the signal propagation round-trip delay between the terminal and the serving cell base station
  • the TA estimated value is the signal propagation round-trip delay between the terminal and the serving cell satellite estimated by the terminal based on the positioning capability. Time.
  • the above-mentioned TA offset value may be a predefined TA offset value, or may be a public TA offset value or a dedicated TA offset value sent by the base station of the serving cell to the terminal, which is not limited in this embodiment of the present application.
  • Step 820 The terminal uses the first TA to send an uplink message to the serving cell base station, where the uplink message includes the first message Msg1 or MsgA in the random access process.
  • Step 830 The serving cell base station receives the uplink message sent by the terminal using the first TA.
  • the terminal uses the first TA to send Msg1 to the serving cell base station, and the process of adjusting the first TA is shown in FIG. 9 .
  • the terminal After the terminal determines the first TA according to the TA offset value and the TA estimated value, it uses the first TA to send Msg1 to the serving cell base station to notify the serving cell base station that there is a random access request, and at the same time enables the serving cell base station to estimate the difference between the base station and the serving cell.
  • the transmission delay between terminals is used to calibrate the first TA.
  • the base station of the serving cell After receiving the Msg1 sent by the terminal, the base station of the serving cell sends an RAR (Msg2) to the terminal to inform the terminal of the uplink resource information that can be used when sending the next message (Msg3).
  • the RAR carries the adjustment amount of the first TA .
  • the adjustment amount of the first TA may be 0. If there is a deviation in the arrival time of the uplink transmission from the terminal in the same time slot but with different frequency domain resources to the base station of the serving cell, the adjustment amount of the first TA of the terminal is notified in Msg2.
  • the terminal receives the RAR, and uses the adjusted uplink TA to send Msg3 to the serving cell base station on the uplink resource indicated by the RAR.
  • the adjusted uplink TA is the same as the first TA.
  • the adjusted uplink TA is determined according to the first TA and the adjustment amount of the first TA.
  • the adjusted uplink TA may be determined according to the following formula (5).
  • TA is the adjusted uplink TA
  • TA1 is the first TA determined by the terminal
  • ⁇ is the adjustment amount of the first TA.
  • the base station of the serving cell After receiving Msg3, the base station of the serving cell knows the adjusted uplink TA of the terminal, and sends Msg4 to the terminal. After the random access is successful, the serving cell base station receives any uplink transmission sent by the terminal using the adjusted uplink TA.
  • the terminal uses the first TA to send the MsgA to the serving cell base station, and the process of adjusting the first TA is shown in FIG. 10 .
  • the terminal After determining the first TA according to the TA offset value and the TA estimated value, the terminal uses the first TA to send MsgA to the serving cell base station to notify the serving cell base station that there is a random access request, and at the same time enables the serving cell base station to estimate the difference between the base station and the serving cell.
  • the transmission delay between terminals is used to calibrate the first TA.
  • the base station of the serving cell After receiving the MsgA sent by the terminal, the base station of the serving cell sends MsgB to the terminal to inform the terminal of uplink resource information that can be used after the random access succeeds, and carries the adjustment amount of the first TA in the MsgB.
  • the adjustment amount of the first TA may be 0. If there is a deviation in the arrival time of the uplink transmission from the terminal in the same time slot but with different frequency domain resources to the base station of the serving cell, the adjustment amount of the first TA of the terminal is notified in MsgB.
  • the terminal receives the MsgB, and adjusts the first TA based on the adjustment amount of the first TA carried by the MsgB.
  • the terminal determines the first TA to send the uplink message according to the introduced TA offset value, which avoids the situation that the terminal overcompensates the TA due to the error of the positioning accuracy.
  • the terminal may also calibrate the first TA according to the instruction of the base station of the serving cell after the random access is completed. By determining the first TA by the terminal and recalibrating the base station of the serving cell, when the terminal uses the first TA to send an uplink message, it will not cause interference to the network side receiving the uplink signal of the previous symbol or sending the downlink signal, ensuring that the network side signal reception performance.
  • FIG. 11 is a flowchart of a first TA-based communication method according to another exemplary embodiment of the present application.
  • the method can be applied to an NTN scenario, and the uplink communication method can include at least part of the following contents:
  • Step 1110 The terminal determines the first TA according to the TA offset value and the TA estimated value.
  • the TA offset value is used to indicate the offset of the signal propagation round-trip delay between the terminal and the serving cell base station
  • the TA estimated value is the signal propagation round-trip delay between the terminal and the serving cell satellite estimated by the terminal based on the positioning capability. Time.
  • the above-mentioned TA offset value may be a predefined TA offset value, or may be a public TA offset value or a dedicated TA offset value sent by the base station of the serving cell to the terminal, which is not limited in this embodiment of the present application.
  • Step 1120 In the RRC connected state, the terminal sends uplink transmission to the serving cell base station using the first TA.
  • the uplink transmission includes at least one of PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel, Physical Uplink Control Channel) and SR (Scheduling Request, Scheduling Request).
  • PUSCH Physical Uplink Shared Channel, Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • SR Service Request, Scheduling Request
  • Step 1130 The serving cell base station receives the uplink transmission sent by the terminal using the first TA.
  • the serving cell base station monitors the uplink transmission from the terminal side in real time, and learns the first TA used by the terminal by receiving any uplink transmission of the terminal. In addition, the serving cell base station may further determine the adjustment value of the first TA for the terminal according to the first TA. This embodiment of the present application does not limit this.
  • the TA offset value is introduced in the process of determining the uplink TA of the terminal, which avoids the situation that the terminal overcompensates the TA due to the error of the positioning accuracy.
  • the uplink signal of the previous symbol or the transmitted downlink signal causes interference, which ensures the signal reception performance on the network side.
  • FIG. 12 is a schematic structural diagram of an apparatus for determining an uplink TA according to an exemplary embodiment.
  • the apparatus 1200 may be configured in a terminal, and the apparatus 1200 includes:
  • the determining module 1210 is configured to determine the first TA according to the TA offset value and the TA estimated value.
  • the TA offset value is used to indicate the offset situation of the round-trip delay of signal propagation between the device and the base station of the serving cell.
  • the estimate is the round-trip delay of signal propagation between the device and the serving cell satellite as estimated by the device based on positioning capabilities.
  • the TA offset value is any of the following:
  • the common TA offset value is the TA offset value configured by the base station of the serving cell for the serving cell where the device is located according to the first positioning capability, and the first positioning capability is the positioning capability of at least one terminal in the serving cell;
  • the predefined TA offset value is a TA offset value pre-configured for the device according to the second positioning capability, and the second positioning capability is the positioning capability of at least one terminal;
  • the dedicated TA offset value, the dedicated TA offset value is the TA offset value configured for the device by the base station of the serving cell according to the third positioning capability, and the third positioning capability is the positioning capability of the device.
  • the TA estimated value is estimated by the device according to the current location of the device and the first ephemeris information
  • the first ephemeris information is the ephemeris information of the serving cell satellite.
  • the first The second TA is the TA on the feeder link between the serving cell satellite and the serving cell base station;
  • a first difference between the TA estimated value and the TA offset value is determined, and the first difference is determined as the first TA.
  • the device is in an NTN scenario based on transparent transmission
  • the determining module 1210 further includes:
  • Obtaining sub-module 1211 for obtaining the second TA on the feeder link between the serving cell satellite and the serving cell base station;
  • the determination sub-module 1212 is configured to determine the first TA according to the TA estimated value, the TA offset value and the second TA.
  • the determination sub-module 1212 includes:
  • the first determination subunit is used to determine the third TA according to the TA estimated value and the second TA, and the third TA is the round-trip delay of signal propagation between the device and the serving cell base station estimated by the device based on the positioning capability;
  • the second determination subunit is configured to determine a second difference between the third TA and the TA offset value, and use the second difference as the first TA.
  • the apparatus 1200 further includes:
  • a sending module configured to use the first TA to send an uplink message, where the uplink message includes Msg1 or MsgA in the random access process.
  • the sending module is also used for:
  • the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH, and a scheduling request SR.
  • the accuracy of the terminal in determining the uplink TA is improved, thereby preventing the terminal from overcompensating the TA due to the error of the positioning accuracy. Therefore, the network side will not receive the previous one.
  • the uplink signal of the symbol or the transmitted downlink signal causes interference, which ensures the signal reception performance on the network side.
  • FIG. 13 is a schematic structural diagram of an apparatus for determining an uplink TA according to another exemplary embodiment.
  • the apparatus 1300 may be configured in a network device (such as a serving cell base station), and the apparatus 1300 includes:
  • the sending module 1310 is configured to send a TA offset value to the terminal, where the TA offset value is used to instruct the terminal to determine the first TA according to the TA offset value.
  • the sending module 1310 is further configured to:
  • the common TA offset value is a TA offset value configured for the serving cell where the terminal is located according to the first positioning capability, and the first positioning capability is the positioning capability of at least one terminal in the serving cell;
  • the dedicated TA offset value is sent to the terminal, where the dedicated TA offset value is a TA offset value configured for the terminal according to the third positioning capability, and the third positioning capability is the positioning capability of the terminal.
  • the apparatus 1300 further includes:
  • the receiving module is configured to receive an uplink message sent by the terminal using the first TA, where the uplink message includes the first message Msg1 or MsgA in the random access process.
  • the receiving module is also used for:
  • the receiving terminal uses the first TA to send uplink transmission, where the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH, and a scheduling request SR.
  • the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH, and a scheduling request SR.
  • the serving cell base station configures the TA offset value for the terminal to avoid the situation that the terminal overcompensates the TA due to the error of the positioning accuracy. Therefore, the serving cell base station will not receive the uplink signal of the previous symbol or send the The downlink signal causes interference, which ensures the signal reception performance of the serving cell base station.
  • FIG. 14 shows a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application, where the communication device may be a terminal and a serving cell base station in the embodiment of the present application.
  • the terminal includes: a processor 1401 , a receiver 1402 , a transmitter 1403 , a memory 1404 and a bus 1405 .
  • the processor 1401 includes one or more processing cores, and the processor 1401 executes various functional applications and information processing by running software programs and modules.
  • the receiver 1402 and the transmitter 1403 may be implemented as a communication component, which may be a communication chip.
  • the memory 1404 is connected to the processor 1401 through the bus 1405 .
  • the memory 1404 may be configured to store at least one instruction, and the processor 1401 is configured to execute the at least one instruction, so as to implement various steps performed by the terminal and the serving cell base station in the foregoing method embodiments.
  • the memory 1404 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, volatile or non-volatile storage device including but not limited to: magnetic disk or optical disk, EEPROM (Electrically Erasable Programmable read only memory, Electrically Erasable Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), SRAM (Static Random Access Memory, Static Access Memory), ROM (Read Only Memory, read-only memory), magnetic memory, flash memory, PROM (Programmable Read-Only Memory, programmable read-only memory).
  • volatile or non-volatile storage device including but not limited to: magnetic disk or optical disk, EEPROM (Electrically Erasable Programmable read only memory, Electrically Erasable Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), SRAM (Static Random Access Memory, Static Access Memory),
  • the present application provides a computer-readable storage medium, where at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by the processor to implement the method for determining an uplink TA provided by the foregoing method embodiments .
  • the present application also provides a computer program product, which, when the computer program product runs on the computer, causes the computer to execute the method for determining the uplink TA provided by the above method embodiments.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.

Landscapes

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

Abstract

La présente invention se rapporte au domaine technique des communications sans fil. L'invention concerne un procédé et un appareil de détermination d'avance temporelle (TA) de liaison montante, et un dispositif et un support de stockage. Le procédé comprend : la détermination d'une première TA en fonction d'une valeur de décalage de TA et d'une valeur d'estimation de TA, la valeur de décalage de TA étant utilisée pour indiquer un état de décalage du retard aller-retour de propagation de signal entre un terminal et une station de base de cellule de desserte, et la valeur d'estimation de TA est un retard aller-retour de propagation de signal, entre le terminal et un satellite de cellule de desserte, estimé par le terminal sur la base d'une capacité de positionnement. Par l'introduction d'une valeur de décalage de TA pendant un processus de détermination d'une TA de liaison montante par un terminal, les modes de réalisation de la présente invention évitent l'apparition d'une surcompensation de TA due à une erreur de précision de positionnement et, par conséquent, aucune interférence ne serait provoquée par la réception d'un signal de liaison montante d'un symbole précédent ou l'envoi d'un signal de liaison descendante par un côté réseau, garantissant ainsi la performance de réception de signal du côté réseau.
PCT/CN2020/107923 2020-08-07 2020-08-07 Procédé et appareil de détermination d'avance temporelle de liaison montante, et dispositif et support de stockage WO2022027628A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2020/107923 WO2022027628A1 (fr) 2020-08-07 2020-08-07 Procédé et appareil de détermination d'avance temporelle de liaison montante, et dispositif et support de stockage
CN202080104679.2A CN116210289A (zh) 2020-08-07 2020-08-07 上行提前定时的确定方法、装置、设备及存储介质

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/107923 WO2022027628A1 (fr) 2020-08-07 2020-08-07 Procédé et appareil de détermination d'avance temporelle de liaison montante, et dispositif et support de stockage

Publications (1)

Publication Number Publication Date
WO2022027628A1 true WO2022027628A1 (fr) 2022-02-10

Family

ID=80116829

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/107923 WO2022027628A1 (fr) 2020-08-07 2020-08-07 Procédé et appareil de détermination d'avance temporelle de liaison montante, et dispositif et support de stockage

Country Status (2)

Country Link
CN (1) CN116210289A (fr)
WO (1) WO2022027628A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115988640A (zh) * 2023-03-17 2023-04-18 深圳泽惠通通讯技术有限公司 一种基于ta值的用户终端距离计算方法、系统及设备
WO2024031590A1 (fr) * 2022-08-11 2024-02-15 Oppo广东移动通信有限公司 Procédé et appareil de communication sans fil pour positionnement, dispositif, système et support de stockage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019195457A1 (fr) * 2018-04-03 2019-10-10 Idac Holdings, Inc. Avance temporelle pour une communication de réseau non terrestre
CN110602779A (zh) * 2019-09-12 2019-12-20 成都天奥集团有限公司 一种基于同步帧的卫星通信上行闭环定时同步方法
US20200153500A1 (en) * 2018-11-13 2020-05-14 Electronics And Telecommunications Research Institute Method and apparatus for signal configuration for mobile base station

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019195457A1 (fr) * 2018-04-03 2019-10-10 Idac Holdings, Inc. Avance temporelle pour une communication de réseau non terrestre
US20200153500A1 (en) * 2018-11-13 2020-05-14 Electronics And Telecommunications Research Institute Method and apparatus for signal configuration for mobile base station
CN110602779A (zh) * 2019-09-12 2019-12-20 成都天奥集团有限公司 一种基于同步帧的卫星通信上行闭环定时同步方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CATT: "PRACH design and UL timing management", 3GPP DRAFT; R1-1912165, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, USA; 20191118 - 20191122, 9 November 2019 (2019-11-09), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051823243 *
PANASONIC: "Timing advance and PRACH design for NTN", 3GPP DRAFT; R1-1912903, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, USA; 20191118 - 20191122, 8 November 2019 (2019-11-08), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051820238 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024031590A1 (fr) * 2022-08-11 2024-02-15 Oppo广东移动通信有限公司 Procédé et appareil de communication sans fil pour positionnement, dispositif, système et support de stockage
CN115988640A (zh) * 2023-03-17 2023-04-18 深圳泽惠通通讯技术有限公司 一种基于ta值的用户终端距离计算方法、系统及设备
CN115988640B (zh) * 2023-03-17 2023-06-16 深圳泽惠通通讯技术有限公司 一种基于ta值的用户终端距离计算方法、系统及设备

Also Published As

Publication number Publication date
CN116210289A (zh) 2023-06-02

Similar Documents

Publication Publication Date Title
CN107197517B (zh) 基于ta分组的lte卫星上行链路同步方法
US20210321353A1 (en) Systems and methods for uplink transmission timing
EP3834514A2 (fr) Procédures d'accès aléatoire pour communications par satellite
WO2021062726A1 (fr) Procédé d'accès aléatoire, dispositif terminal, dispositif de réseau et support d'enregistrement
CN113498628B (zh) 监听随机接入响应的方法、设备及存储介质
WO2021155596A1 (fr) Procédé et appareil d'indication d'informations, dispositif et support de stockage
WO2022027628A1 (fr) Procédé et appareil de détermination d'avance temporelle de liaison montante, et dispositif et support de stockage
WO2022011710A1 (fr) Procédé et appareil de mise à jour d'avance temporelle de liaison montante, dispositif et support
CN115023985A (zh) 地面网络通信和非地面网络通信集成中的时序处理方法及其装置
WO2022141414A1 (fr) Procédé et appareil de diffusion d'informations publiques, et dispositif et support
WO2023035276A1 (fr) Procédé et appareil de transmission en liaison montante, dispositif et support de stockage
WO2023039809A1 (fr) Procédé de déclenchement de sr et procédé et appareils d'accès aléatoire, dispositif et support de stockage
US20230328798A1 (en) Random access methods, terminal device and network device
WO2023097421A1 (fr) Procédé et appareil de rapport d'informations, et dispositif, support de stockage et produit de programme
WO2023004552A1 (fr) Procédé et appareil d'accès aléatoire, et dispositif et support d'enregistrement
US20240031964A1 (en) Adjustment method and determination method for transmission timing, and terminal device
WO2022104602A1 (fr) Procédé et appareil pour rapporter une avance temporelle dans un ntn, procédé et appareil pour recevoir une avance temporelle dans un ntn, et dispositif
US20230262632A1 (en) Method and apparatus for determining timing advance value
WO2022205482A1 (fr) Procédé de communication sans fil et dispositif de terminal
WO2022266882A1 (fr) Procédé et appareil de détermination de période de validité, dispositif et support d'enregistrement
KR20240048503A (ko) 무선 통신 시스템에서 pucch 반복 전송 방법 및 장치
WO2023152368A1 (fr) Indication temporelle d'époque de réseau non terrestre prenant en compte un cycle sfn

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20948125

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20948125

Country of ref document: EP

Kind code of ref document: A1