WO2021027625A1 - 一种确定定时提前的方法以及相关设备 - Google Patents

一种确定定时提前的方法以及相关设备 Download PDF

Info

Publication number
WO2021027625A1
WO2021027625A1 PCT/CN2020/106776 CN2020106776W WO2021027625A1 WO 2021027625 A1 WO2021027625 A1 WO 2021027625A1 CN 2020106776 W CN2020106776 W CN 2020106776W WO 2021027625 A1 WO2021027625 A1 WO 2021027625A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal device
satellite
timing advance
error
ephemeris
Prior art date
Application number
PCT/CN2020/106776
Other languages
English (en)
French (fr)
Inventor
王晓鲁
罗禾佳
徐晨蕾
李榕
王俊
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2021027625A1 publication Critical patent/WO2021027625A1/zh
Priority to US17/671,335 priority Critical patent/US11743854B2/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/006—Synchronisation arrangements determining timing error of reception due to propagation delay using known positions of transmitter and receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • This application relates to the field of communication technologies, and in particular to a method for determining timing advance and related equipment.
  • UE user equipment
  • RAR random access response
  • TA Carry timing advance
  • Satellite communication has the characteristics of large coverage area and flexible networking.
  • Technologies and industry are paying attention to the communication scenarios of satellite-ground integration, and seamlessly connect non-terrestrial networks (NTN) with terrestrial communications.
  • NTN non-terrestrial networks
  • True global coverage global roaming.
  • the terminal device sends a random access preamble to the satellite and applies for access according to the timing advance.
  • the timing advance is usually calculated based on the location of the terminal device and the ephemeris information (the orbit height of the satellite can be obtained).
  • the timing advance error is relatively large. Therefore, the terminal equipment uses the random access preamble sent in advance of the timing, and it is prone to arrive at the satellite early. When the random access preamble arrives at the satellite ahead of time, the subsequent random access process generates inter-code interference.
  • the embodiment of the application provides a method for determining timing advance and related equipment. Since the positioning error of the terminal device and the ephemeris error of the satellite are considered in the process of determining the timing advance, the terminal device uses the random access sent by the timing advance. Entering the preamble can avoid reaching the satellite in advance, thereby avoiding inter-symbol interference in the subsequent random access process.
  • an embodiment of the present application provides a method for determining timing advance, which includes: a terminal device obtains satellite ephemeris information, where the ephemeris information includes satellite coordinates and the ephemeris error of the satellite, and the ephemeris error of the satellite is determined by Satellite broadcast transmission; terminal equipment determines the timing advance through preset rules based on ephemeris information and terminal equipment location information, where the terminal equipment location information includes terminal equipment coordinates and terminal equipment positioning errors, and the preset rules pass the first level The distance, the first vertical distance, the ephemeris error, and the positioning error are determined. The first horizontal distance and the first vertical distance are calculated from the terminal device coordinates and the satellite coordinates.
  • the terminal device can avoid reaching the satellite early by using the random access preamble sent by the timing advance, thereby avoiding The subsequent random access process generates inter-code interference.
  • the timing advance is determined by preset rules according to ephemeris information and the location information of the terminal device, including: the terminal device according to the first horizontal distance, the first vertical distance, and the terminal device
  • the first positioning error and the first ephemeris error of the satellite determine the timing advance, where the ephemeris error includes the first ephemeris error of the satellite, and the positioning error includes the first positioning error of the terminal device.
  • the preset rules specifically include: Among them, TA represents timing advance, H represents the first vertical distance, S represents the first horizontal distance, D represents the first positioning error of the terminal device, E represents the first ephemeris error of the satellite, and c represents the speed of light constant.
  • the positioning error of the terminal device and the ephemeris error of the satellite are considered in the process of determining the timing advance, so that the timing advance determined by the preset rule is closer to the real time delay situation, and the terminal device is guaranteed to advance according to the use timing
  • the transmitted random access preamble can reach the satellite at the correct time.
  • the timing advance is determined by preset rules according to ephemeris information and the location information of the terminal device, including: the terminal device according to the first horizontal distance, the first vertical distance, and the terminal device
  • the horizontal positioning error, the vertical positioning error of the terminal equipment, and the first ephemeris error of the satellite determine the timing advance.
  • the positioning error includes the horizontal positioning error of the terminal equipment and the vertical positioning error of the terminal equipment
  • the ephemeris error includes the first ephemeris error of the satellite. Calendar error.
  • the preset rules specifically include: Among them, TA represents timing advance, H represents the first vertical distance, S represents the first horizontal distance, D v represents the vertical positioning error of the terminal device, D h represents the horizontal positioning error of the terminal device, and E represents the first ephemeris error of the satellite , C represents the speed of light constant.
  • the vertical positioning error, horizontal positioning error and satellite ephemeris error of the terminal device are considered in the process of determining the timing advance, so that the timing advance determined by the preset rule is closer to the real time delay situation, and the terminal device is guaranteed
  • the random access preamble sent according to the usage timing advance can reach the satellite in the correct time period.
  • the timing advance is determined by preset rules according to ephemeris information and the location information of the terminal device, including: the terminal device according to the first horizontal distance, the first vertical distance, and the terminal device
  • the horizontal positioning error, the vertical positioning error of the terminal equipment, the horizontal ephemeris error of the satellite and the vertical ephemeris error of the satellite determine the timing advance.
  • the positioning error includes the horizontal positioning error of the terminal equipment and the vertical positioning error of the terminal equipment. Including the satellite's horizontal ephemeris error and the satellite's vertical ephemeris error.
  • the preset rules specifically include: Among them, TA represents timing advance, H represents the first vertical distance, S represents the first horizontal distance, D v represents the vertical positioning error of the terminal device, D h represents the horizontal positioning error of the terminal device, and Ev represents the vertical ephemeris error of the satellite. E h represents the horizontal ephemeris error of the satellite, and c represents the speed of light constant.
  • the vertical positioning error of the terminal device, the horizontal positioning error of the terminal device, the horizontal ephemeris error of the satellite, and the vertical ephemeris error of the satellite are considered in the process of determining the timing advance, so that the timing determined by the preset rule The advancement is closer to the real time delay situation, ensuring that the random access preamble sent by the terminal device according to the use timing advance can reach the satellite in the correct time period.
  • the timing advance is determined by preset rules according to ephemeris information and the location information of the terminal device, including: the terminal device according to the first horizontal distance, the first vertical distance, and the terminal device
  • the horizontal positioning error and the first ephemeris error of the satellite determine the timing advance, where the positioning error includes the horizontal positioning error of the terminal device, and the ephemeris error includes the first ephemeris error of the satellite.
  • the preset rules specifically include: Among them, TA represents timing advance, H represents the first vertical distance, S represents the first horizontal distance, D h represents the horizontal positioning error of the terminal device, E represents the first ephemeris error of the satellite, and c represents the speed of light constant.
  • a method for determining the timing advance when the terminal device only has a two-dimensional positioning capability is provided. And in the process of determining the timing advance, the horizontal positioning error of the terminal equipment and the ephemeris error of the satellite are considered, so that the timing advance determined by the preset rules is closer to the real time delay situation, and the terminal equipment is guaranteed to send according to the timing advance.
  • the random access preamble can reach the satellite at the correct time.
  • the method further includes:
  • the terminal device obtains the public timing advance, where the public timing advance is sent by the satellite, and the public timing advance is determined according to the distance between the public timing advance reference point and the satellite, and the public timing advance reference point is the distance in the cell corresponding to the reference point The closest point of the satellite. Normally, the selected reference point is the position where the beam coverage is closest to the sub-satellite point.
  • the terminal equipment determines the use timing advance in the terminal equipment according to the public timing advance and the timing advance;
  • the public timing advance is determined to be the use timing advance
  • the timing advance is determined to be the use timing advance.
  • the timing advance determined by the preset rule is compared with the common timing advance to determine the use timing advance, which avoids the use of the determined timing advance with large errors. Ensure that the random access preamble sent by the terminal equipment according to the use timing advance can reach the satellite in the correct time period.
  • obtaining the ephemeris information of the satellite by the terminal device includes: obtaining the satellite coordinates, the ephemeris error of the satellite, and the common timing advance of the satellite by the terminal device.
  • a terminal device which is used to execute the first aspect or any possible implementation of the first aspect.
  • the terminal device includes a module for executing the foregoing first aspect or any one of the possible implementation manners of the first aspect.
  • a terminal device which may include: a processor and a memory; an input/output (I/O) interface, a processor, and a memory, and the memory stores program instructions; the The processor is configured to execute program instructions stored in the memory, so that the computer device executes the method for determining the timing advance in any one of the foregoing first aspect and the first aspect.
  • I/O input/output
  • the embodiments of the present application provide a computer-readable storage medium that stores instructions in the computer-readable storage medium, which when run on a computer, causes the computer to execute any of the first aspect and the first aspect.
  • the embodiments of the present application provide a computer program product containing instructions that, when run on a computer, cause the computer to execute the method for determining the timing advance of the first aspect and any one of the possible implementations of the first aspect. .
  • the present application provides a chip system that includes a processor for supporting terminal equipment to implement the functions involved in the first aspect above, or for supporting satellites to implement the functions involved in the first aspect above Functions, for example, sending or processing the data and/or information involved in the above methods.
  • the chip system further includes a memory, which is used to store necessary program instructions and data for the satellite or terminal equipment.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the chip system may also include an interface for sending and receiving data.
  • inventions of the present application provide a communication device.
  • the communication device may include an entity such as a terminal device or a chip.
  • the communication device includes: a processor and a memory; the memory is used for storing instructions; the processor is used for Executing the instructions in the memory causes the communication device to execute the method for determining timing advance in any one of the foregoing first aspect and the first aspect.
  • the terminal equipment coordinates and satellite coordinates calculate the first horizontal distance between the terminal equipment and the satellite, and the first vertical distance between the terminal equipment and the satellite; determine the timing advance according to the first horizontal distance, the first vertical distance, the ephemeris error, and the positioning error .
  • the timing advance the positioning error of the terminal device and the ephemeris error of the satellite are considered. Therefore, the random access preamble sent by the terminal device using the timing advance can avoid reaching the satellite early, thereby avoiding the subsequent random access process. Inter-symbol interference.
  • Figure 1 is a schematic diagram of random access
  • 2 is a schematic diagram of the relationship between the timing advance and round-trip delay of uplink data in an embodiment of the application;
  • Figure 3a is a schematic diagram of a terminal device determining timing advance in an embodiment of the application
  • Figure 3b is a schematic diagram of satellite broadcast public timing advance in an embodiment of the application.
  • FIG. 4 is a schematic diagram of the random access preamble arriving in advance in an embodiment of the application.
  • 5a is a schematic structural diagram of a communication system to which a method for determining timing advance in an embodiment of the application is applicable;
  • 5b is a schematic diagram of an embodiment of a method for determining timing advance in an embodiment of the application
  • Fig. 6 is a schematic diagram of ephemeris error in an embodiment of the application.
  • FIG. 7 is a schematic diagram of a calculation scenario of a public timing advance in an embodiment of the application.
  • FIG. 8 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • FIG. 9 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • FIG. 10 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • FIG. 11 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • FIG. 12 is a schematic diagram of an embodiment of a terminal device in an embodiment of the application.
  • FIG. 13 is a schematic structural diagram of a terminal device according to an embodiment of the application.
  • FIG. 14 is a schematic structural diagram of a chip system according to an embodiment of the application.
  • the embodiment of the application provides a method for determining timing advance and related equipment. Since the positioning error of the terminal device and the ephemeris error of the satellite are considered in the process of determining the timing advance, the terminal device uses the timing advance to transmit The random access preamble can avoid reaching the satellite in advance, thereby avoiding inter-code interference in the subsequent random access process.
  • Figure 1 is a schematic diagram of random access.
  • the terminal device sends data such as a random access preamble to the network device.
  • the terminal device selects random access preamble (random access preamble) and physical random access channel (PRACH) resources and uses the PRACH resource to send the selected random access preamble to the network device.
  • random access preamble random access preamble
  • PRACH physical random access channel
  • data such as the identification of the terminal device (ie, the UE ID) and small data packets are also sent.
  • the terminal device determines random access preamble (random access preamble) and physical random access channel (physical random access channel, PRACH) resources and uses the PRACH resource to send the selected random access preamble to the network device.
  • the network device sends a random access response to the terminal device.
  • step 102 the network device sends a random access response (random access response, RAR) to the terminal device.
  • RAR random access response
  • the network device receives the random access preamble and sends a random access response (Random Access Response, RAR) to the terminal device.
  • the RAR carries a timing advance (timing advance, TA), and the timing advance is obtained by the network device by detecting the random access preamble.
  • the terminal equipment uses TA to adjust the uplink timing.
  • the length of TA signaling is 12 bits, which can represent ⁇ 0,1,2...3846 ⁇ .
  • TA can represent a maximum length of 2 milliseconds, and can only represent a positive value.
  • the random access response also includes a cell-radio network temporary identifier (C-RNTI) assigned by the network device or a temporary cell-radio network temporary identifier (TC-RNTI).
  • C-RNTI cell-radio network temporary identifier
  • TC-RNTI temporary cell-radio network temporary identifier
  • the random access response includes one or more types of information such as timing advance, power control information, time and frequency resource configuration.
  • the terminal device sends Msg3 to the network device.
  • the terminal device sends Msg3 (First scheduled UL transmission on UL-SCH) to the network device.
  • the terminal device adjusts the uplink timing in advance according to the timing in the random access response, and transmits Msg3 in the uplink resource allocated by the network device for subsequent data transmission.
  • Msg3 may carry a radio resource control link establishment message (radio resource control connection request), and may also carry a radio resource control re-establishment message (radio resource control connection re-establishment request).
  • the Msg3 carries the contention resolution identity of the terminal device, so as to complete the final contention resolution.
  • step 104 the network device issues Msg4 to the terminal device.
  • the terminal device completes the contention resolution according to the Msg4.
  • the satellite as a network device has a large distance from the terminal device, resulting in a large delay between the satellite and the terminal device.
  • the terminal device In order to align the timing of the uplink data with the downlink data, the terminal device needs to use timing advance when sending the random access preamble.
  • FIG. 2 is a schematic diagram of the relationship between the timing advance and the round-trip delay of uplink data in an embodiment of this application.
  • FIG. 2 includes a terminal device 10 and a satellite 20, and the satellite 20 serves as a network device to provide communication services to the terminal device.
  • the satellite 20 as a network device in the embodiment of the present application and subsequent embodiments is only an implementation of the network device.
  • the network device may also be in other forms.
  • the network device is an airship, a balloon, Aircraft and ships are not limited here.
  • the horizontal frame represents the time occupied by the downlink data sent by the satellite 20, and the vertical frame represents the time occupied by the uplink data sent by the terminal device 10.
  • the time when the satellite 20 sends the downlink data and the time when the terminal device 10 receives the downlink data there is a one-way transmission delay.
  • the time when the terminal device 10 sends the uplink data and the time when the satellite 20 receives the uplink data is also a one-way transmission delay. Therefore, from the time when the satellite 20 sends the downlink data to the time when the satellite 20 receives the uplink data, there is a round-trip transmission delay. Since the distance between the satellite 20 and the terminal device 10 is relatively large, the round-trip transmission delay between the satellite 20 and the terminal device 10 is relatively large.
  • the terminal device can obtain the timing advance used by the terminal device in two ways before initial random access.
  • the first is that the terminal device determines the timing advance according to the position information of the terminal device and the ephemeris information of the satellite.
  • FIG. 3a is a schematic diagram of the terminal device determining the timing advance in an embodiment of the application.
  • the satellite's ephemeris information includes the satellite's sub-satellite point (the sub-satellite point is the intersection of the line between the center of the earth and the satellite on the surface of the earth, expressed in geographic longitude and latitude.
  • the ground point directly below the satellite is called the sub-satellite point.
  • the orbital height of the satellite Specifically, according to the distance (S) between the positioning position of the terminal device and the sub-satellite point of the satellite, the orbit height of the satellite determines the timing advance.
  • the second is based on the current broadcast common timing advance (common TA), which is broadcast by satellites.
  • common TA common timing advance
  • Figure 3b is a schematic diagram of satellite broadcast public timing advance in an embodiment of this application.
  • the common timing advance is determined by the round-trip delay from the satellite to the center of the beam, or the round-trip delay from the satellite to the point closest to the beam.
  • the beam is sent by the satellite, and the area covered by the beam is the cell served by the current satellite.
  • the terminal device After obtaining the timing advance, the terminal device sends the random access preamble according to the timing advance. Due to the positioning error of the terminal device and the ephemeris error of the satellite, the random access preamble sent by the terminal device often arrives earlier than the ideal situation.
  • the ideal situation is that the random access preamble sent by the terminal device according to the timing advance
  • the occupied time period is consistent with the time period occupied by the preamble detection window of the network device to detect the random access preamble.
  • FIG. 4 is a schematic diagram of the random access preamble arriving in advance in an embodiment of the application.
  • the subsequent random access process generates inter-code interference.
  • it is necessary to extend the time period occupied by the preamble detection window which in turn causes the problem of reduced transmission efficiency.
  • this application proposes a method and related equipment for determining timing advance.
  • the technical solution of the present application will be further described by way of embodiments.
  • FIG. 5a is a schematic structural diagram of a communication system to which a method for determining timing advance in an embodiment of the application is applicable.
  • the satellite coordinates determined according to the ephemeris information of the satellite 20 and the ephemeris error (E) relative to the satellite coordinates the terminal equipment coordinates determined according to the position information of the terminal equipment 10 and the coordinates relative to the terminal equipment
  • the vertical distance (H) from the coordinates of the satellite to the sub-satellite point can be known
  • the timing advance of the terminal device 10 is calculated based on the above information. In the process of determining the timing advance, the positioning error of the terminal device and the ephemeris error of the satellite are considered. Therefore, the random access preamble sent by the terminal device using the timing advance can avoid reaching the satellite early, thereby avoiding the subsequent random access process. Inter-symbol interference.
  • the communication system shown in FIG. 5a may be a base station access system of a 4G network, or may be a base station access system of a 5G network.
  • the communication system includes one or more network devices and one or more terminal devices.
  • the network device is a satellite 20
  • the terminal device is a terminal device 10
  • the satellite 20 provides communication services for the terminal device 10; in another alternative implementation manner
  • the network device is a satellite 20, and the terminal device 10 is also a kind of network device.
  • the satellite 20 provides a communication service for the terminal device 10.
  • the terminal device 10 acts as a relay to provide the communication service to other terminal devices connected to the terminal device 10. , There is no limitation here.
  • the network device is a satellite 20
  • the terminal device 10 is also a kind of network device
  • the satellite 20 provides communication services for the terminal device 10
  • the terminal device 10 acts as a relay to other devices connected to the terminal device 10.
  • the terminal device provides this communication service.
  • the network device as the terminal device 10 may be any device with a wireless transceiver function, or a chip set in a device with a specific wireless transceiver function.
  • the network equipment includes but is not limited to: base station (such as base station BS, base station NodeB, evolved base station eNodeB or eNB, base station gNodeB or gNB in the fifth generation 5G communication system, base station in future communication system, access in WiFi system Nodes, wireless relay nodes, wireless backhaul nodes), etc.
  • the base station may be: macro base station, micro base station, pico base station, small station, relay station, etc. Multiple base stations can support the network of one or more technologies mentioned above, or the future evolution network.
  • the core network can support the network of one or more technologies mentioned above, or the future evolution network.
  • the base station may include one or more co-site or non co-site transmission receiving points (transmission receiving points, TRP).
  • the network device may also be a wireless controller, a centralized unit (CU), or a distributed unit (DU) in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • the network device can also be a server, a wearable device, or a vehicle-mounted device.
  • the following description takes the network device as a base station as an example.
  • the multiple network devices may be base stations of the same type, or base stations of different types.
  • the base station can communicate with the terminal equipment, and it can also communicate with the terminal equipment through the relay station.
  • the terminal device can support communication with multiple base stations of different technologies.
  • the terminal device can support communication with base stations that support LTE networks, can also support communication with base stations that support 5G networks, and can also support base stations and 5G networks that support LTE networks.
  • the terminal is connected to the RAN node of the wireless network.
  • RAN nodes are: gNB, transmission reception point (TRP), evolved Node B (evolved Node B, eNB), radio network controller (RNC), Node B (Node B) B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit) , BBU), or wireless fidelity (Wifi) access point (AP), etc.
  • the network device may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node.
  • the following description takes the satellite 20 as a network device and the terminal device 10 as a terminal device as an example.
  • Figure 5a is an introduction using satellite communication as an example, which can of course be used in other communication systems.
  • the communication system shown in Figure 5a can also be a mobile satellite communication system in satellite communication.
  • the network equipment includes but is not limited to: non-geostationary earth (NGEO) communication satellites, NGEO communication A device with a wireless transceiver function in a satellite, or a chip set in a device with a specific wireless transceiver function in an NGEO communication satellite.
  • NGEO non-geostationary earth
  • the terminal device 10 in the embodiment of the present application is also called user equipment (UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), terminal equipment, etc., which is a kind of A device with voice and/or data connectivity, or a chip set in the device, for example, a handheld device with a wireless connection power permission, a vehicle-mounted device, etc.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • terminal equipment etc.
  • UE user equipment
  • a device with voice and/or data connectivity or a chip set in the device, for example, a handheld device with a wireless connection power permission, a vehicle-mounted device, etc.
  • Terminal devices can include, but are not limited to: handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, other processing devices connected to wireless modems, mobile phones, tablets, laptops, and palmtop computers , Mobile Internet device (MID), machine type communication terminal, virtual reality (VR) equipment, augmented reality (AR) equipment, industrial control (industrial control) wireless terminal, unmanned Wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, smart city (smart city) The wireless terminal in the smart home, the wireless terminal in the smart home, etc.
  • MID Mobile Internet device
  • VR virtual reality
  • AR augmented reality
  • industrial control industrial control
  • unmanned Wireless terminal in self-driving wireless terminal in remote medical surgery
  • wireless terminal in smart grid wireless terminal in transportation safety
  • smart city smart city
  • FIG. 5b is a schematic diagram of an embodiment of a method for determining timing advance in an embodiment of the present application.
  • the terminal device when the terminal device needs to access the satellite, the terminal device first obtains the ephemeris information of the satellite and the location information of the terminal device.
  • the terminal device obtains the ephemeris information of the satellite.
  • the ephemeris information is sent by satellite broadcast, and the terminal device obtains the ephemeris information of the satellite by receiving the satellite broadcast.
  • the satellite’s ephemeris information includes satellite coordinates and satellite ephemeris errors.
  • FIG. 6, is a schematic diagram of the ephemeris error in an embodiment of this application.
  • the ephemeris error is included in the ephemeris information broadcast by the satellite, and the ephemeris error can be expressed as an error in a three-dimensional direction or as an error in a two-dimensional direction.
  • the ephemeris information can be pre-stored in the terminal device or pre-stored in the cloud server in another alternative implementation.
  • searching according to the terminal device coordinate can provide the location of the terminal device coordinate.
  • obtaining the ephemeris information of the satellite is not limited here.
  • the terminal device obtains the location information of the terminal device, and the location information of the terminal device includes the coordinates of the terminal device and the positioning error of the terminal device.
  • the coordinates of the terminal device can be expressed in latitude and longitude coordinates, for example: north latitude N22° 32' 43.86", east longitude E114° 03' 10.40".
  • the timing advance is determined by a preset rule. Specifically, the first horizontal distance is calculated according to the terminal equipment coordinates and the satellite coordinates, and the first horizontal distance is the distance between the satellite's sub-satellite point and the location of the terminal equipment; the first vertical distance is calculated according to the terminal equipment coordinates and the satellite coordinates Distance, the first vertical distance can be the orbital height of the satellite, or the distance between the orbital height of the satellite and the altitude of the terminal device, which is not limited here; the satellite is determined based on the ephemeris information and the position information of the terminal device The ephemeris error and the positioning error of the terminal equipment.
  • the terminal device can know from the ephemeris information and the terminal device positioning information that the satellite coordinates (x1, y1), where x1 represents the horizontal of the satellite Coordinates, y1 represents the ordinate of the satellite; terminal device coordinates (x2, y2), where x2 represents the abscissa of the terminal device, and y2 represents the ordinate of the terminal device.
  • the first vertical distance is:
  • the timing advance is determined through preset rules. According to different situations of the terminal equipment and the satellite, there are multiple ways to determine the timing advance, which will be described in detail in the subsequent embodiments.
  • the terminal device after determining the timing advance through a preset rule, the terminal device also obtains the common timing advance, and the common timing advance is broadcast by the satellite. It should be noted that step 503 is an optional step, and the terminal device can directly use the timing advance determined by the preset rule.
  • FIG. 7 is a schematic diagram of a calculation scenario of a public timing advance in an embodiment of the application.
  • the distance (H) between the satellite orbit and the altitude of the terminal equipment is 1200 kilometers (kilometre, km)
  • the beam coverage of the satellite That is, the projected diameter of the beam on the ground is 90 km
  • the distance between the sub-satellite point of the satellite and the position of the terminal device also called the first horizontal distance (S)
  • S the first horizontal distance
  • the selected reference point is the position where the beam coverage is closest to the sub-satellite point, in Figure 7 between the public timing advance reference point and the satellite sub-satellite point The distance is 1843.6km, and the angle between the horizontal plane of the reference point and the satellite is 33.06 degrees (degree). Therefore, the common timing advance can be calculated by the following methods:
  • TA_common is the common timing advance
  • c is the speed of light constant. According to the formula, in the scene corresponding to FIG. 6, the common timing advance is 14.67 milliseconds (millisecond, ms).
  • the terminal device determines the use timing advance according to the timing advance and the common timing advance. It should be noted that, for terminal devices without a positioning function, the public timing advance is directly determined as the use timing advance.
  • Step 504 is an optional step. When step 503 is not performed, the terminal device directly uses the timing advance determined by the preset rule, and therefore, step 504 is not performed.
  • the public timing advance is determined to be the use timing advance; if the public timing advance is less than or equal to the timing advance, the timing advance is determined to be the use timing advance.
  • the common timing advance reference point is the point closest to the satellite in the cell corresponding to the reference point.
  • the determined timing advance is smaller than the public timing advance, the position of the terminal device corresponding to the determined timing advance is closer than the public timing advance reference point, so it does not match the actual situation and there is an error.
  • the public timing advance is selected as the terminal The use timing of the equipment is advanced.
  • the location of the terminal device corresponding to the determined timing advance is in the cell corresponding to the determined timing advance reference point, which is a reasonable range, so the determined timing advance is selected as the terminal device The use of timing advance.
  • the terminal device can avoid reaching the satellite early by using the random access preamble sent by the timing advance. In turn, the inter-code interference caused by the subsequent random access process is avoided.
  • the timing advance determined by the preset rule is compared with the public timing advance, and then the timing advance is determined to be used, avoiding the use of the determined timing advance with large error. Ensure that the random access preamble sent by the terminal equipment according to the use timing advance can reach the satellite in the correct time period.
  • FIG. 8 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • the first vertical distance (H) is 1200 kilometers; the distance between the satellite's sub-satellite point and the terminal equipment is 1913.6 kilometers, that is, the first horizontal distance (S ) Is 1913.6 kilometers; the first ephemeris error (E) of the satellite is 6 meters; the first positioning error (D) of the terminal device is 10 kilometers as an example.
  • the distance selected when determining the timing advance is the distance between the terminal equipment and the satellite minus the positioning error and then the ephemeris error.
  • the terminal device may exist at any point in the sphere formed by the terminal device coordinates as the center of the sphere and the first positioning error as the radius; the satellite may exist at the center of the sphere with the satellite coordinates, the first star
  • the calendar error is any point in the sphere formed by the radius. Therefore, in fact, the distance selected for determining the timing advance is the line between the point where the terminal device coordinates are located and the point where the satellite coordinates are located. The distance between the line and the intersection of the two spheres is the shortest distance between the two spheres. distance.
  • timing advance is determined by the following methods:
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • D represents the first positioning error of the terminal device
  • E represents the first ephemeris error of the satellite
  • c represents the speed of light constant.
  • the positioning error of the terminal device and the ephemeris error of the satellite are considered in the process of determining the timing advance, so that the timing advance determined by the preset rule is closer to the real time delay situation, and the terminal device is guaranteed to advance according to the use timing
  • the transmitted random access preamble can reach the satellite at the correct time.
  • the positioning error of the terminal device includes horizontal positioning error and vertical positioning error.
  • FIG. 9 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • the first vertical distance (H) is 1200 kilometers; the distance between the satellite's sub-satellite point and the terminal equipment is 1913.6 kilometers, that is, the first horizontal distance (S ) Is 1913.6 kilometers; the first ephemeris error (E) of the satellite is 6 meters; the vertical positioning error (Dv) of the terminal equipment is 8 kilometers; the horizontal positioning error (D h ) of the terminal equipment is 8 kilometers Take an example.
  • the distance selected when determining the timing advance is the distance between the terminal equipment and the satellite minus the positioning error and then the ephemeris error.
  • the terminal device may exist at any point in the cylinder formed with the terminal device coordinates as the center, the horizontal positioning error as the radius, and the 2 times the vertical positioning error as the height (using the terminal device ordinate as the zero point,
  • the ordinate of the top of the cylinder is y1+Dv
  • the ordinate of the bottom of the cylinder is y1-Dv
  • the satellite may exist at any point in the sphere formed by the satellite coordinates as the center and the first ephemeris error as the radius.
  • the line between the sub-satellite point and the satellite coordinates, and the line between the terminal device coordinates and the sub-satellite point determine a plane.
  • the cross section of the cylinder where the terminal device is located is rectangular, and the satellite is in this plane.
  • the cross section of the sphere is a circle, and the shortest distance between the rectangle and the circle is: the point closest to the satellite coordinates in the end of the rectangle is connected to the center of the circle and the first ephemeris error (radius of the circle) is subtracted.
  • the specific calculation method is as follows:
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • D v represents the vertical positioning error of the terminal device
  • D h represents the horizontal positioning error of the terminal device
  • E represents the first ephemeris error of the satellite
  • C represents the speed of light constant.
  • the vertical positioning error, horizontal positioning error and satellite ephemeris error of the terminal device are considered in the process of determining the timing advance, so that the timing advance determined by the preset rule is closer to the real time delay situation, and the terminal device is guaranteed
  • the random access preamble sent according to the usage timing advance can reach the satellite in the correct time period.
  • the positioning error of the terminal device is a cylinder
  • the range of the satellite ephemeris error is a cylinder.
  • the positioning error of the terminal equipment includes horizontal positioning error and vertical positioning error
  • the satellite ephemeris error includes horizontal ephemeris error and vertical ephemeris error.
  • FIG. 10 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • the first vertical distance (H) is 1200 kilometers; the distance between the satellite's sub-satellite point and the terminal equipment is 1913.6 kilometers, that is, the first horizontal distance (S ) Is 1913.6 km; the horizontal ephemeris error (Eh) of the satellite is 1 km; the vertical ephemeris error (Ev) of the satellite is 1 km; the vertical positioning error (Dv) of the terminal equipment is 8 km; the terminal equipment Take a scene where the horizontal positioning error (D h ) is 8 kilometers as an example.
  • the distance selected when determining the timing advance is the distance between the terminal equipment and the satellite minus the positioning error and then the ephemeris error.
  • the terminal device may exist at any point in the cylinder formed with the terminal device coordinates as the center, the horizontal positioning error as the radius, and the 2 times the vertical positioning error as the height (using the terminal device ordinate as the zero point,
  • the ordinate of the top of the cylinder is y1+Dv
  • the ordinate of the bottom of the cylinder is y1-Dv
  • satellites may exist with satellite coordinates as the center, the horizontal ephemeris error as the radius, and 2 times the vertical ephemeris error as high, forming Any point in the cylinder (take the satellite ordinate as the zero point, the top ordinate of the cylinder is y2+Ev, and the bottom ordinate of the cylinder is y2-Ev).
  • the line between the sub-satellite point and the satellite coordinates, and the line between the terminal device coordinates and the sub-satellite point determine a plane.
  • the cross section of the cylinder where the terminal device is located is a rectangle.
  • the cross section of the cylinder where the terminal device is located is referred to as the first rectangle.
  • the cross section of the cylinder where the satellite is located is a rectangle.
  • the cross section of the cylinder where the satellite is located is referred to as the second rectangle.
  • the shortest distance between the first rectangle and the second rectangle is: the line between the point closest to the satellite coordinates in the end of the first rectangle and the point closest to the coordinates of the terminal device in the end of the second rectangle.
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • Dv represents the vertical positioning error of the terminal device
  • D h represents the horizontal positioning error of the terminal device
  • Ev represents the vertical ephemeris error of the satellite
  • E h represents the horizontal ephemeris error of the satellite
  • c represents the light speed constant.
  • the vertical positioning error of the terminal device, the horizontal positioning error of the terminal device, the horizontal ephemeris error of the satellite, and the vertical ephemeris error of the satellite are considered in the process of determining the timing advance, so that the timing determined by the preset rule The advancement is closer to the real time delay situation, ensuring that the random access preamble sent by the terminal device according to the use timing advance can reach the satellite in the correct time period.
  • the terminal device when the terminal device has only two-dimensional positioning capability, the coordinates acquired by the terminal device have no height information. It is explained that the range of the positioning error of the terminal device is a circle and the range of the satellite ephemeris error is a sphere. In this case, the positioning error of the terminal equipment includes the horizontal positioning error, and the ephemeris error of the satellite includes the first ephemeris error.
  • FIG. 11 is a schematic diagram of another embodiment of a method for determining timing advance in an embodiment of this application.
  • the first vertical distance (H) is 1200 kilometers; the distance between the satellite's sub-satellite point and the terminal equipment is 1913.6 kilometers, that is, the first horizontal distance (S ) Is 1913.6 kilometers; the first ephemeris error (E) of the satellite is 6 meters; the horizontal positioning error (D h ) of the terminal equipment is 10 kilometers as an example.
  • the distance selected when determining the timing advance is the distance between the terminal equipment and the satellite minus the positioning error and then the ephemeris error.
  • the terminal device may exist at any point in the circle centered on the terminal device coordinates and the horizontal positioning error is the radius; the satellite may exist on the sphere centered on the satellite coordinates and the first ephemeris error is the radius Any point in the formed sphere.
  • the line between the sub-satellite point and the satellite coordinates, and the line between the terminal device coordinates and the sub-satellite point define a plane, in which the cross section of the circle where the terminal device is located is a line segment with a length twice the horizontal positioning error ,
  • the cross section of the sphere where the satellite is located in the plane is a circle, and the shortest distance between the line segment and the circle is: the point closest to the satellite coordinates in the line segment is connected to the center of the circle and the first ephemeris error (circle Radius).
  • the specific calculation method is as follows:
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • D h represents the horizontal positioning error of the terminal device
  • E represents the first ephemeris error of the satellite
  • c represents the speed of light constant.
  • a method for determining the timing advance when the terminal device only has a two-dimensional positioning capability is provided. And in the process of determining the timing advance, the horizontal positioning error of the terminal equipment and the ephemeris error of the satellite are considered, so that the timing advance determined by the preset rules is closer to the real time delay situation, and the terminal equipment is guaranteed to send according to the timing advance.
  • the random access preamble can reach the satellite at the correct time.
  • the above-mentioned terminal device includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiment of the present application may divide the terminal device into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 12 is a schematic diagram of an embodiment of a terminal device in an embodiment of the present application.
  • the terminal device 10 includes:
  • the obtaining module 101 is configured to obtain satellite ephemeris information, where the ephemeris information includes satellite coordinates and satellite ephemeris errors;
  • the determining module 102 is used to determine the timing advance according to the ephemeris information and the location information of the terminal device 10 through preset rules, where the location information of the terminal device 10 includes the coordinates of the terminal device 10 and the positioning error of the terminal device 10, and the preset rules
  • the first horizontal distance, the first vertical distance, the ephemeris error, and the positioning error are determined.
  • the first horizontal distance and the first vertical distance are calculated from the coordinates of the terminal device 10 and the satellite coordinates.
  • the terminal device 10 includes:
  • the determining module 102 is specifically configured to determine the timing advance according to the first horizontal distance, the first vertical distance, the first positioning error of the terminal device 10, and the first ephemeris error of the satellite, where the ephemeris error includes the first ephemeris of the satellite Error, the positioning error includes the first positioning error of the terminal device 10.
  • the preset rules specifically include:
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • D represents the first positioning error of the terminal device 10
  • E represents the first ephemeris error of the satellite
  • c represents the speed of light constant.
  • the terminal device 10 includes:
  • the determining module 102 is specifically configured to determine the timing advance according to the first horizontal distance, the first vertical distance, the horizontal positioning error of the terminal device 10, the vertical positioning error of the terminal device 10, and the first ephemeris error of the satellite, where the positioning error includes The horizontal positioning error of the terminal device 10 and the vertical positioning error of the terminal device 10, the ephemeris error includes the first ephemeris error of the satellite.
  • the preset rules specifically include:
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • D v represents the vertical positioning error of the terminal device 10
  • D h represents the horizontal positioning error of the terminal device 10
  • E represents the first satellite of the satellite.
  • c represents the constant of light speed.
  • the terminal device 10 includes:
  • the determining module 102 is specifically configured to determine the timing advance according to the first horizontal distance, the first vertical distance, the horizontal positioning error of the terminal device 10, the vertical positioning error of the terminal device 10, the horizontal ephemeris error of the satellite, and the vertical ephemeris error of the satellite , Where the positioning error includes the horizontal positioning error of the terminal device 10 and the vertical positioning error of the terminal device 10, and the ephemeris error includes the horizontal ephemeris error of the satellite and the vertical ephemeris error of the satellite.
  • the preset rules specifically include:
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • D v represents the vertical positioning error of the terminal device 10
  • D h represents the horizontal positioning error of the terminal device 10
  • Ev represents the vertical ephemeris of the satellite Error
  • Eh represents the satellite's horizontal ephemeris error
  • c represents the speed of light constant.
  • the terminal device 10 includes:
  • the determining module 102 is specifically configured to determine the timing advance according to the first horizontal distance, the first vertical distance, the horizontal positioning error of the terminal device 10, and the first ephemeris error of the satellite, where the positioning error includes the horizontal positioning error of the terminal device 10,
  • the ephemeris error includes the satellite's first ephemeris error.
  • the preset rules specifically include:
  • TA timing advance
  • H represents the first vertical distance
  • S represents the first horizontal distance
  • D h represents the horizontal positioning error of the terminal device 10
  • E represents the first ephemeris error of the satellite
  • c represents the speed of light constant.
  • the terminal device 10 includes:
  • the acquiring module 101 is also used to acquire a public timing advance, where the public timing advance is sent by a satellite;
  • the determining module 102 is further configured to determine the use timing advance in the terminal device 10 according to the public timing advance and the timing advance;
  • the determining module 102 is further configured to determine that the public timing advance is the use timing advance if the public timing advance is greater than the timing advance;
  • the determining module 102 is further configured to determine that the timing advance is the use timing advance if the common timing advance is less than or equal to the timing advance.
  • the determining module may be implemented by a processor, and the acquiring module may be implemented by a receiver or a receiving circuit or an input interface.
  • the terminal device may include: a processor 1301 (such as a CPU), a memory 1302, a transmitter 1304, and a receiver 1303; a transmitter 1304 and a receiver 1303 Coupled to the processor 1301, the processor 1301 controls the sending action of the transmitter 1304 and the receiving action of the receiver 1303.
  • the memory 1302 may include a high-speed RAM memory, or may also include a non-volatile memory NVM, such as at least one disk memory.
  • the memory 1302 may store various instructions for completing various processing functions and implementing the methods of the embodiments of the present application step.
  • the terminal device involved in the embodiment of the present application may further include one or more of a power supply 1305 and a communication port 1306.
  • the devices described in FIG. 13 may be connected through a communication bus or through other The connection mode is connected, which is not limited in the embodiment of this application.
  • the receiver 1303 and the transmitter 1304 may be integrated in the transceiver of the terminal device, or may be independent receiving and transmitting antennas on the terminal device.
  • the communication bus is used to realize the communication connection between the components.
  • the aforementioned communication port 1306 is used to implement connection and communication between the terminal device and other peripherals.
  • the processor 1301 in the terminal device may perform the actions performed by the determining module 102 in FIG. 12, and the receiver 1303 in the terminal device may perform the actions performed by the acquiring module 101 in FIG. 12, its implementation principles and technical effects Similar, not repeat them here.
  • the aforementioned memory 1302 is used to store computer executable program codes, and the program codes include instructions; when the processor 1301 executes the instructions, the instructions cause the processor 1301 to perform the actions performed by the processing module of the terminal device in the aforementioned embodiments, I will not repeat them here.
  • the present application also provides a chip system. Please refer to FIG. 14.
  • the chip system includes a processor 1401 and a memory 1402, and the memory 1402 is used to store necessary program instructions and data for the terminal device.
  • the chip system can be composed of chips, or include chips and other discrete devices.
  • the chip system further includes a power supply and a transceiver (not shown in FIG. 14), which are used to support the above-mentioned terminal device to realize its related functions.
  • the transceiver can receive the information in the above-mentioned method embodiment.
  • the data and/or information involved such as the location information of the terminal device, etc.
  • the transceiver After the transceiver receives the data and/or information involved in the foregoing method embodiments, it sends the data and/or information to the processor 1401 so that the processor 1401 can process the data and/or information.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (for example, coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.).
  • wired for example, coaxial cable, optical fiber, Digital Subscriber Line (DSL)
  • wireless for example, infrared, wireless, microwave, etc.
  • the computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

本申请实施例公开了一种确定定时提前的方法以及相关设备，包括：获取卫星的星历信息，其中，星历信息包括卫星坐标以及卫星的星历误差；根据星历信息以及终端设备的位置信息，通过预设规则确定定时提前，其中，位置信息包括终端设备坐标以及终端设备的定位误差，预设规则通过第一水平距离、第一垂直距离、星历误差以及定位误差确定。本实施例提供的方法使得通过预设规则确定的定时提前更贴近真实时延情况，可以应用于非陆地网络。

Description

一种确定定时提前的方法以及相关设备
本申请要求于2019年08月14日提交中国专利局、申请号为201910750187.X、发明名称为“一种确定定时提前的方法以及相关设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种确定定时提前的方法以及相关设备。
背景技术
在5G新空口(5g new radio，5G NR)标准协议中，用户设备(user equipment,UE)也称终端设备，初始接入网络(即接入网络设备)的方式是基于竞争的随机接入方式。随机接入过程中，网络设备在接收到终端设备发送的随机接入前导(random access preamble)后，需要下发给终端设备一个随机接入响应(random access response，RAR)，随机接入响应中携带定时提前(timing advance，TA)。终端设备使用定时提前调整上行定时。
卫星通信具有覆盖区域大、组网灵活等特点，目前，学术界和工业界都在关注星地融合的通信场景，将非陆地网络(non-terrestrial networks，NTN)与陆地通信无缝连接，实现真正的全球覆盖、全球漫游。在NTN场景中，由于卫星(作为网络设备)到终端设备的往返时延较大，在初始随机接入前，终端设备根据定时提前，向卫星发送随机接入前导、申请接入。
定时提前通常根据终端设备定位的位置以及星历信息(可以获得卫星的轨道高度)来计算。然而，由于星历误差和定位误差造成定时提前误差较大，因此终端设备使用该定时提前发送的随机接入前导，容易发生提前到达卫星的情况。当发生随机接入前导提前到达卫星时，后续随机接入过程产生码间干扰。
发明内容
本申请实施例提供了一种确定定时提前的方法以及相关设备，由于确定定时提前的过程中，考虑终端设备的定位误差以及卫星的星历误差，因此，终端设备使用该定时提前发送的随机接入前导可以避免提前到达卫星，进而避免了后续随机接入过程产生码间干扰。
第一方面，本申请实施例提供了一种确定定时提前的方法，包括：终端设备获取卫星的星历信息，其中，星历信息包括卫星坐标以及卫星的星历误差，卫星的星历误差由卫星广播发送；终端设备根据星历信息以及终端设备的位置信息，通过预设规则确定定时提前，其中，终端设备的位置信息包括终端设备坐标以及终端设备的定位误差，预设规则通过第一水平距离、第一垂直距离、星历误差以及定位误差确定，第一水平距离以及第一垂直距离由终端设备坐标与卫星坐标计算得到。
本申请实施例中，由于确定定时提前的过程中，考虑终端设备的定位误差以及卫星的星历误差，因此，终端设备使用该定时提前发送的随机接入前导可以避免提前到达卫星，进而避免了后续随机接入过程产生码间干扰。
在第一方面的一种可能的实现方式中，根据星历信息以及终端设备的位置信息，通过预设规则确定定时提前，包括：终端设备根据第一水平距离、第一垂直距离、终端设备的第一定位误差以及卫星的第一星历误差确定定时提前，其中，星历误差包括卫星的第一星历误差，定位误差包括终端设备的第一定位误差。预设规则具体包括：
Figure PCTCN2020106776-appb-000001
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D表示终端设备的第一定位误差，E表示卫星的第一星历误差，c表示光速常数。
本申请实施例中，确定定时提前的过程中考虑了终端设备的定位误差以及卫星的星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
在第一方面的一种可能的实现方式中，根据星历信息以及终端设备的位置信息，通过预设规则确定定时提前，包括：终端设备根据第一水平距离、第一垂直距离、终端设备的水平定位误差、终端设备的垂直定位误差以及卫星的第一星历误差确定定时提前，其中，定位误差包括终端设备的水平定位误差以及终端设备的垂直定位误差，星历误差包括卫星的第一星历误差。预设规则具体包括：
Figure PCTCN2020106776-appb-000002
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D v表示终端设备的垂直定位误差，D h表示终端设备的水平定位误差，E表示卫星的第一星历误差，c表示光速常数。
本申请实施例中，确定定时提前的过程中考虑了终端设备的垂直定位误差、水平定位误差以及卫星的星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
在第一方面的一种可能的实现方式中，根据星历信息以及终端设备的位置信息，通过预设规则确定定时提前，包括：终端设备根据第一水平距离、第一垂直距离、终端设备的水平定位误差、终端设备的垂直定位误差、卫星的水平星历误差以及卫星的垂直星历误差确定定时提前，其中，定位误差包括终端设备的水平定位误差以及终端设备的垂直定位误差，星历误差包括卫星的水平星历误差以及卫星的垂直星历误差。预设规则具体包括：
Figure PCTCN2020106776-appb-000003
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D v表示终端设备的垂直定位误差，D h表示终端设备的水平定位误差，Ev表示卫星的垂直星历误差，E h表示卫星的水平星历误差，c表示光速常数。
本申请实施例中，确定定时提前的过程中考虑了终端设备的垂直定位误差、终端设备的水平定位误差、卫星的水平星历误差以及卫星的垂直星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
在第一方面的一种可能的实现方式中，根据星历信息以及终端设备的位置信息，通过预设规则确定定时提前，包括：终端设备根据第一水平距离、第一垂直距离、终端设备的水平定位误差以及卫星的第一星历误差确定定时提前，其中，定位误差包括终端设备的水平定位误差，星历误差包括卫星的第一星历误差。预设规则具体包括：
Figure PCTCN2020106776-appb-000004
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D h表示终端设备的水平定位误差，E表示卫星的第一星历误差，c表示光速常数。
本申请实施例中，提供了在终端设备仅具有二维定位能力情况下，确定定时提前的方法。并且在确定定时提前的过程中考虑了终端设备的水平定位误差以及卫星的星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
在第一方面的一种可能的实现方式中，通过预设规则确定定时提前之后，还包括:
终端设备获取公共定时提前，其中，公共定时提前由卫星发送，公共定时提前根据公共定时提前参考点与卫星之间的距离确定的，该公共定时提前参考点是该参考点所对应的 小区中距离卫星最近的点。通常情况下，选取的参考点是波束覆盖范围距离星下点最近的位置。
终端设备根据公共定时提前与定时提前，确定终端设备中的使用定时提前；
若公共定时提前大于定时提前，则确定公共定时提前为使用定时提前；
若公共定时提前小于或等于定时提前，则确定定时提前为使用定时提前。
本申请实施例中，通过预设规则确定的定时提前与公共定时提前进行比较，进而确定使用定时提前，避免了使用误差较大的确定的定时提前。保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
在第一方面的一种可能的实现方式中，终端设备获取卫星的星历信息，包括：终端设备获取卫星坐标、卫星的星历误差以及卫星的公共定时提前。
第二方面，提供了一种终端设备，用于执行第一方面或第一方面任意可能的实现方式中的方法。具体地，该终端设备包括用于执行上述第一方面或第一方面的任一种可能的实现方式中的方法的模块。
第三方面，本申请实施例提供了一种终端设备，该终端设备可以包括：处理器和存储器；输入/输出(I/O)接口、处理器和存储器，该存储器中存储有程序指令；该处理器用于执行存储器中存储的程序指令，以使该计算机设备执行如上述第一方面、第一方面任意一种可能实现方式的确定定时提前的方法。
第四方面，本申请实施例提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第一方面、第一方面任意一种可能实现方式的确定定时提前的方法。
第五方面，本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面、第一方面任意一种可能实现方式的确定定时提前的方法。
第六方面，本申请提供了一种芯片系统，该芯片系统包括处理器，用于支持终端设备实现上述第一方面中所涉及的功能，或者，用于支持卫星实现上述第一方面中所涉及的功能，例如，发送或处理上述方法中所涉及的数据和/或信息。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存卫星或者终端设备必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包括芯片和其他分立器件。所述芯片系统还可以包括接口，用于收发数据。
第七方面，本申请实施例提供一种通信装置，该通信装置可以包括终端设备或者芯片等实体，所述通信装置包括：处理器、存储器；所述存储器用于存储指令；所述处理器用于执行所述存储器中的所述指令，使得所述通信装置执行如上述第一方面、第一方面任意一种可能实现方式的确定定时提前的方法。
从以上技术方案可以看出，本申请实施例具有以下优点：
根据终端设备坐标与卫星坐标，计算终端设备与卫星的第一水平距离，以及终端设备与卫星的第一垂直距离；根据第一水平距离、第一垂直距离、星历误差以及定位误差确定定时提前。由于确定定时提前的过程中，考虑终端设备的定位误差以及卫星的星历误差，因此，终端设备使用该定时提前发送的随机接入前导可以避免提前到达卫星，进而避免了后续随机接入过程产生码间干扰。
附图说明
图1为随机接入示意图；
图2为本申请实施例中上行数据的定时提前与往返时延关系示意图；
图3a为本申请实施例中终端设备确定定时提前示意图；
图3b为本申请实施例中卫星广播公共定时提前示意图；
图4为本申请实施例中随机接入前导提前到达示意图；
图5a为本申请实施例中一种确定定时提前的方法所适用的通信系统的结构示意图；
图5b为本申请实施例中一种确定定时提前的方法的一个实施例示意图；
图6为本申请实施例中星历误差的示意图；
图7为本申请实施例中公共定时提前的计算场景示意图；
图8为本申请实施例中一种确定定时提前的方法的另一个实施例示意图；
图9为本申请实施例中一种确定定时提前的方法的另一个实施例示意图；
图10为本申请实施例中一种确定定时提前的方法的另一个实施例示意图；
图11为本申请实施例中一种确定定时提前的方法的另一个实施例示意图；
图12为本申请实施例中终端设备的一种实施例示意图；
图13为本申请实施例的终端设备的结构示意图；
图14为本申请实施例的芯片系统的结构示意图。
具体实施方式
本申请实施例提供了一种确定定时提前的方法以及相关设备，由于确定定时提前的过程中，考虑终端设备的定位误差以及卫星的星历(ephemeris)误差，因此，终端设备使用该定时提前发送的随机接入前导可以避免提前到达卫星，进而避免了后续随机接入过程产生码间干扰。
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例进行介绍。
首先，介绍随机接入过程，请参阅图1，图1为随机接入示意图。
101、终端设备向网络设备发送随机接入前导码等数据。
步骤101中，终端设备选择随机接入前导码(random access preamble)和物理随机接入信道(physical random access channel，PRACH)资源并利用该PRACH资源向网络设备发送所选的随机接入前导码。除了随机接入前导码以外，还发送终端设备的标识(即UE ID)以及小数据包等数据。终端设备确定随机接入前导码(random access preamble)和物理随机接入信道(physical random access channel，PRACH)资源并利用该PRACH资源向网络设备发送所选的随机接入前导码。
102、网络设备向终端设备发送随机接入响应。
步骤102中，网络设备向终端设备发送随机接入响应(random access response，RAR)。
网络设备接收到随机接入前导码，向终端设备发送随机接入响应(Random Access Response，RAR)。RAR中携带定时提前(timing advance，TA)，该定时提前由网络设备通过检测随机接入前导得到。终端设备使用TA调整上行定时。TA信令长度为12位比特，可以表示{0,1,2…3846}。TA可以表示的调整值为TA＝TA·16·64/(2μ·480*103*4096)。当子载波宽度为15千赫兹时，TA最大可表示2毫秒长度，且只能表示正值。
随机接入响应中还包含网络设备分配的小区无线网络临时标识(cell-radio network temporary identifier，C-RNTI)或者为临时小区无线网络临时标识(temporary cell-radio network temporary identifier，TC-RNTI)。随机接入响应包含定时提前、功率控制信息、时间和频率资源配置等一种或多种信息。
103、终端设备向网络设备发送Msg3。
步骤103中，终端设备向网络设备发送Msg3(First scheduled UL transmission on UL-SCH)。终端设备根据随机接入响应中的定时提前调整上行定时，并在网络设备为其分配的上行资源中传输Msg3，以便进行后续的数据传输。
Msg3可能携带无线资源控制建链消息(radio resource control connection request)，也可能携带无线资源控制重建消息(radio resource control connection re-establishment request)。该Msg3携带终端设备的竞争解决标识(ue contention resolution identity)，以便完成最终的竞争解决。
104、完成竞争解决。
步骤104中，网络设备向终端设备下发Msg4。终端设备根据该Msg4完成竞争解决。
对于非陆地网络(non-terrestrial networks，NTN)中，由于作为网络设备的卫星，与终端设备之间的距离较大，造成卫星与终端设备之间的延迟较大。为了使上行数据与下行数据的定时对齐，在终端设备发送上述随机接入前导时，需要使用定时提前。
具体的，请参阅图2，图2为本申请实施例中上行数据的定时提前与往返时延关系示意图。图2中包括终端设备10以及卫星20，卫星20作为网络设备向终端设备提供通信服务。需要说明的是，本申请实施例以及后续实施例中作为网络设备的卫星20，仅是网络设备的一种实现方式，该网络设备还可以是其它形式，例如，该网络设备为飞艇、气球、飞行器以及船舶等，此处不作限定。
横线框表示卫星20发送的下行数据所占用的时间，竖线框表示终端设备10发送的上行数据所占用的时间。在卫星20发送下行数据的时刻与终端设备10接收下行数据的时刻之间，为单程传输时延。终端设备10发送上行数据的时刻与卫星20接收上行数据的时刻之间同样为单程传输时延。因此，从卫星20发送下行数据的时刻至卫星20接收上行数据的时刻之间，为往返传输时延。由于卫星20与终端设备10之间的距离较大，因此卫星20与终端设备10之间的往返传输时延较大。
为了解决卫星与终端设备之间往返传输时延较大的问题，现有技术方案中，终端设备在初始随机接入之前，可以通过两种方式获取终端设备所使用的定时提前。
第一是终端设备根据终端设备定位的位置信息以及卫星的星历信息确定定时提前，请参阅图3a，图3a为本申请实施例中终端设备确定定时提前示意图。卫星的星历信息包括卫星的星下点(星下点是地球中心与卫星的连线在地球表面上的交点，用地理经、纬度表示。卫星正下方的地面点称为星下点。以及卫星的轨道高度)。具体的，根据终端设备的定位位置与卫星的星下点之间的距离(S)，卫星的轨道高度确定定时提前。
第二是根据当前广播的公共定时提前(common TA)，该公共定时提前由卫星广播。请参阅图3b，图3b为本申请实施例中卫星广播公共定时提前示意图。该公共定时提前由卫 星至波束中心位置的往返时延，或卫星至距离波束最近点的往返时延确定。该波束由卫星发出，该波束所覆盖的区域为当前卫星提供服务的小区。
通过上述两种方法，终端设备获取定时提前后，根据定时提前发送随机接入前导。由于终端设备存在定位误差，并且卫星存在星历误差，因此，终端设备所发送的随机接入前导往往会比理想情况提前到达，该理想情况为终端设备根据定时提前所发送的随机接入前导所占用的时段，与网络设备检测该随机接入前导的前导检测窗所占用的时段一致。具体的，请参阅图4，图4为本申请实施例中随机接入前导提前到达示意图。当发生随机接入前导提前到达卫星时，后续随机接入过程产生码间干扰。在这种情况下，为了使得卫星能够完整接收到终端设备发送的随机接入前导，需要延长前导检测窗所占用的时段，这又造成了传输效率下降的问题。
基于上述技术缺陷，本申请提出了一种确定定时提前的方法以及相关设备。下面以实施例的方式，对本申请技术方案做进一步的说明。
请参阅图5a，图5a为本申请实施例中一种确定定时提前的方法所适用的通信系统的结构示意图。如图5a所示，根据卫星20的星历信息确定的卫星坐标以及相对于该卫星坐标的星历误差(E)，根据终端设备10的位置信息确定的终端设备坐标以及相对于该终端设备坐标的定位误差(D)，根据该星历信息可知卫星所在坐标至星下点的垂直距离(H)，以及根据星历信息以及终端设备10的位置信息确定的终端设备10至星下点的水平距离(S)。根据上述信息计算终端设备10的定时提前。由于确定定时提前的过程中，考虑终端设备的定位误差以及卫星的星历误差，因此，终端设备使用该定时提前发送的随机接入前导可以避免提前到达卫星，进而避免了后续随机接入过程产生码间干扰。
图5a所示的通信系统可以是4G网络的基站接入系统，或可以为5G网络的基站接入系统。该通信系统包括一个或多个网络设备，以及一个或多个终端设备。以图5a为例，在一种可选的实现方式中，该网络设备为卫星20，该终端设备为终端设备10，卫星20为终端设备10提供通信服务；在另一种可选的实现方式中，该网络设备为卫星20，终端设备10也是一种网络设备，卫星20为终端设备10提供通信服务，该终端设备10作为中继向其它与终端设备10所连接的终端设备提供该通信服务，此处不作限定。
其中，在下述实现方式中：该网络设备为卫星20，终端设备10也是一种网络设备，卫星20为终端设备10提供通信服务，该终端设备10作为中继向其它与终端设备10所连接的终端设备提供该通信服务。作为终端设备10的该网络设备可以是任意一种具有无线收发功能的设备，或，设置于具体无线收发功能的设备内的芯片。该网络设备包括但不限于：基站(例如基站BS，基站NodeB、演进型基站eNodeB或eNB、第五代5G通信系统中的基站gNodeB或gNB、未来通信系统中的基站、WiFi系统中的接入节点、无线中继节点、无线回传节点)等。基站可以是：宏基站，微基站，微微基站，小站，中继站等。多个基站可以支持上述提及的一种或者多种技术的网络，或者未来演进网络。该核心网可以支持上述提及一种或者多种技术的网络，或者未来演进网络。基站可以包含一个或多个共站或非共站的传输接收点(transmission receiving point，TRP)。网络设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、集中单元(centralized  unit，CU)或者分布单元(distributed unit，DU)等。该网络设备还可以是服务器，可穿戴设备，或车载设备等。以下以网络设备为基站为例进行说明。该多个网络设备可以为同一类型的基站，也可以为不同类型的基站。基站可以与终端设备进行通信，也可以通过中继站与终端设备进行通信。终端设备可以支持与不同技术的多个基站进行通信，例如，终端设备可以支持与支持LTE网络的基站通信，也可以支持与支持5G网络的基站通信，还可以支持与LTE网络的基站以及5G网络的基站的双连接。例如将终端接入到无线网络的RAN节点。目前，一些RAN节点的举例为：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)等。在一种网络结构中，该网络设备可以包括集中单元(centralized unit，CU)节点、或分布单元(distributed unit，DU)节点、或包括CU节点和DU节点的RAN设备。
为了便于说明，下面以卫星20为网络设备，终端设备10为终端设备为例进行描述。
图5a是以卫星通信为例进行的介绍，当然可以用于其他通信系统。图5a所示的通信系统也可以是卫星通信中的移动卫星通信系统，在移动卫星通信系统中该网络设备包括但不限于：非静止轨道(non-geostationary earth orbit，NGEO)通信卫星，NGEO通信卫星中具有无线收发功能的设备，或，NGEO通信卫星中设置于具体无线收发功能的设备内的芯片。
本申请实施例中的终端设备10又称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)、终端设备等，是一种向用户提供语音和/或数据连通性的设备，或，设置于该设备内的芯片，例如，具有无线连接功率允许的手持式设备、车载设备等。终端设备可以包括但不限于：具有无线通信功能的手持式设备、车载设备、可穿戴设备、计算设备、连接到无线调制解调器的其它处理设备、手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、机器类型通信终端、虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
下面结合附图对本申请实施例中一种确定定时提前的方法进行详细说明，图5b为本申请实施例中一种确定定时提前的方法的一个实施例示意图。
501、获取卫星的星历信息。
本实施例中，当终端设备需要接入卫星时，终端设备首先获取卫星的星历信息，以及终端设备的位置信息。
终端设备获取卫星的星历信息，该星历信息在一种可选的实现方式中，由卫星广播发出，终端设备通过接收卫星的广播获取卫星的星历信息。该卫星的星历信息中包括卫星坐标以及卫星的星历误差。这种情况请参阅图6，图6为本申请实施例中星历误差的示意图。星历误差包含在卫星广播的星历信息中，该星历误差可以表示为三维方向的误差，也可以表示为二维方向的误差。
该星历信息在另一种可选的实现方式中，预存于终端设备中或预存与云端服务器中，当终端设备需要接入卫星时，根据终端设备坐标查找能为该终端设备坐标所在位置提供通信服务的卫星，进一步地，获取该卫星的星历信息，此处不作限定。
终端设备获取终端设备的位置信息，该终端设备的位置信息包括终端设备坐标以及终端设备的定位误差。终端设备坐标可以使用经纬度坐标表示，例如：北纬N22° 32′ 43.86″,东经E114° 03′ 10.40″。
502、通过预设规则确定定时提前。
本实施例中，终端设备在获取卫星的星历信息以及终端设备的位置信息之后，通过预设规则确定定时提前。具体的，根据终端设备坐标与卫星坐标计算得到第一水平距离，该第一水平距离为卫星的星下点与终端设备所在位置之间的距离；根据终端设备坐标与卫星坐标计算得到第一垂直距离，该第一垂直距离可以是卫星的轨道高度，也可以是卫星的轨道高度与终端设备所在的海拔高度之间的距离，此处不作限定；根据星历信息以及终端设备的位置信息确定卫星的星历误差以及终端设备的定位误差。
具体的，在终端设备坐标点、星下点以及卫星坐标点三点确定的平面内，终端设备根据星历信息以及终端设备定位信息可知，卫星坐标(x1，y1)，其中x1表示卫星的横坐标，y1表示卫星的纵坐标；终端设备坐标(x2，y2)，其中x2表示终端设备的横坐标，y2表示终端设备的纵坐标。则第一垂直距离为：|y1-y2|；第一水平距离为：|x2-x1|。
根据星历误差、定位误差、第一水平距离以及第一垂直距离，通过预设规则确定定时提前。根据终端设备与卫星的不同情况，存在多种确定定时提前的方式，在后续实施例中进行详细描述。
503、获取公共定时提前。
本实施例中，终端设备在通过预设规则确定定时提前后，还获取公共定时提前，该公共定时提前由卫星广播。需要说明的是，步骤503为可选步骤，终端设备可以直接使用通过预设规则确定的定时提前。
具体的，请参阅图7，图7为本申请实施例中公共定时提前的计算场景示意图。如图7所示，根据卫星的星历信息以及终端设备的位置信息可知，卫星轨道与终端设备所在海拔高度的距离(H)为1200千米(kilometre，km)，该卫星的波束覆盖范围(即该波束在地面上投影的直径)为90km，该卫星的星下点与终端设备位置之间的距离，也称为第一水平距离(S)为1913.6km。由于公共定时提前需要根据参考点计算具体值，通常情况下，选取的参考点是波束覆盖范围距离星下点最近的位置，在图7中该公共定时提前参考点与卫星的星下点之间的距离为1843.6km，该参考点所在的水平面与卫星之间的夹角为33.06度(degree)。因此，公共定时提前可以通过下列方法计算：
Figure PCTCN2020106776-appb-000005
TA_common＝14.67ms；
其中，TA_common为公共定时提前，c为光速常数。根据公式可得，在图6所对应的场景中，公共定时提前为14.67毫秒(millisecond，ms)。
504、确定使用定时提前。
本实施例中，终端设备在确定定时提前，以及获取公共定时提前之后，根据该定时提前以及该公共定时提前确定使用定时提前。需要说明的是，对于没有定位功能的终端设备，则直接确定公共定时提前为使用定时提前。步骤504为可选步骤，当不执行步骤503时，终端设备直接使用通过预设规则确定的定时提前，因此也不执行步骤504。
具体的，若公共定时提前大于定时提前，则确定公共定时提前为使用定时提前；若公共定时提前小于或等于定时提前，则确定定时提前为使用定时提前。下面进行详细阐述：
由于公共定时提前是根据公共定时提前参考点与卫星之间的距离确定的，该公共定时提前参考点是该参考点所对应的小区中距离卫星最近的点。当确定的定时提前比公共定时提前还要小时，确定的定时提前所对应终端设备的位置比公共定时提前参考点还要近，因此与实际情况不符，存在误差，此时选择公共定时提前作为终端设备的使用定时提前。
而当确定的定时提前大于或等于公共定时提前时，确定的定时提前所对应终端设备的位置处于该确定定时提前参考点所对应的小区中，属于合理范围，因此选择确定的定时提前作为终端设备的使用定时提前。
本申请实施例中，由于确定定时提前的过程中，考虑终端设备的定位误差以及卫星的星历(ephemeris)误差，因此，终端设备使用该定时提前发送的随机接入前导可以避免提前到达卫星，进而避免了后续随机接入过程产生码间干扰。同时将通过预设规则确定的定时提前与公共定时提前进行比较，进而确定使用定时提前，避免了使用误差较大的确定的定时提前。保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
在图5对应的实施例的基础上，下面对通过预设规则确定定时提前进行详细介绍。
首先，以终端设备定位误差的范围为球体，卫星星历误差的范围为球体的情况进行说明。请参阅图8，图8为本申请实施例中一种确定定时提前的方法的另一个实施例示意图。
以卫星位置距离终端设备所在的海拔高度为1200千米，即第一垂直距离(H)为1200千米；卫星的星下点与终端设备的距离为1913.6千米，即第一水平距离(S)为1913.6千米；卫星的第一星历误差(E)为6米；终端设备的第一定位误差(D)为10千米的场景为例进行说明。
为了将终端设备的定位误差与卫星的星历误差考虑进确定定时提前的过程中，确定定时提前时选取的距离为终端设备与卫星之间的距离减去定位误差再减去星历误差。在图8对应的场景中，终端设备可能存在于以终端设备坐标为球心，第一定位误差为半径形成的球型中的任意一点；卫星可能存在于以卫星坐标为球心，第一星历误差为半径形成的球型中的任意一点。因此，实际上确定定时提前所选取的距离，为终端设备坐标所在点与卫星坐标所在点两点之间的连线，该连线与两个球面交点之间的距离，即两个球面的最短距离。
具体的，通过下列方法确定定时提前：
Figure PCTCN2020106776-appb-000006
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D表示终端设备的第一定位误差，E表示卫星的第一星历误差，c表示光速常数。
在图8对应的场景中，具体计算过程如下：
Figure PCTCN2020106776-appb-000007
Figure PCTCN2020106776-appb-000008
TA＝0.01499。
本申请实施例中，确定定时提前的过程中考虑了终端设备的定位误差以及卫星的星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
其次，以终端设备定位误差的范围为圆柱体，卫星星历误差的范围为球体的情况进行说明。这种情况是终端设备的定位误差包括水平定位误差以及垂直定位误差。
请参阅图9，图9为本申请实施例中一种确定定时提前的方法的另一个实施例示意图。
以卫星位置距离终端设备所在的海拔高度为1200千米，即第一垂直距离(H)为1200千米；卫星的星下点与终端设备的距离为1913.6千米，即第一水平距离(S)为1913.6千米；卫星的第一星历误差(E)为6米；终端设备的垂直定位误差(Dv)为8千米；终端设备的水平定位误差(D h)为8千米的场景为例进行说明。
为了将终端设备的定位误差与卫星的星历误差考虑进确定定时提前的过程中，确定定时提前时选取的距离为终端设备与卫星之间的距离减去定位误差再减去星历误差。在图9对应的场景中，终端设备可能存在于以终端设备坐标为圆心，水平定位误差为半径，2倍垂直定位误差为高，形成的圆柱中的任意一点(以终端设备纵坐标为零点，该圆柱的顶部纵坐标为y1+Dv，该圆柱的底部纵坐标为y1-Dv)；卫星可能存在于以卫星坐标为球心，第一星历误差为半径形成的球型中的任意一点。
如图9所示，星下点与卫星坐标的连线，终端设备坐标与星下点的连线确定一个平面，在该平面内终端设备所在的圆柱体的截面为矩形，在该平面内卫星所在的球体的截面为圆形，该矩形与该圆形之间的最短距离为：矩形端点中距离卫星坐标最近的点与圆心相连并减去第一星历误差(圆形的半径)。具体的计算方法如下：
Figure PCTCN2020106776-appb-000009
Figure PCTCN2020106776-appb-000010
TA＝0.01498；
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D v表示终端设备的垂直定位误差，D h表示终端设备的水平定位误差，E表示卫星的第一星历误差，c表示光速常数。
本申请实施例中，确定定时提前的过程中考虑了终端设备的垂直定位误差、水平定位误差以及卫星的星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
再次，以终端设备定位误差的范围为圆柱体，卫星星历误差的范围为圆柱体的情况进行说明。这种情况是终端设备的定位误差包括水平定位误差以及垂直定位误差，卫星星历误差包括水平星历误差以及垂直星历误差。
请参阅图10，图10为本申请实施例中一种确定定时提前的方法的另一个实施例示意图。
以卫星位置距离终端设备所在的海拔高度为1200千米，即第一垂直距离(H)为1200千米；卫星的星下点与终端设备的距离为1913.6千米，即第一水平距离(S)为1913.6千米；卫星的水平星历误差(Eh)为1千米；卫星的垂直星历误差(Ev)为1千米；终端设备的垂直定位误差(Dv)为8千米；终端设备的水平定位误差(D h)为8千米的场景为例进行说明。
为了将终端设备的定位误差与卫星的星历误差考虑进确定定时提前的过程中，确定定时提前时选取的距离为终端设备与卫星之间的距离减去定位误差再减去星历误差。在图10对应的场景中，终端设备可能存在于以终端设备坐标为圆心，水平定位误差为半径，2倍垂直定位误差为高，形成的圆柱中的任意一点(以终端设备纵坐标为零点，该圆柱的顶部纵坐标为y1+Dv，该圆柱的底部纵坐标为y1-Dv)；卫星可能存在于以卫星坐标为圆心，水平星历误差为半径，2倍垂直星历误差为高，形成的圆柱中的任意一点(以卫星纵坐标为零点，该圆柱的顶部纵坐标为y2+Ev，该圆柱的底部纵坐标为y2-Ev)。
如图10所示，星下点与卫星坐标的连线，终端设备坐标与星下点的连线确定一个平面。在该平面内终端设备所在的圆柱体的截面为矩形，这里为了便于说明，将终端设备所在的圆柱体的截面称为第一矩形。在该平面内卫星所在的圆柱体的截面为矩形，这里为了便于说明，将卫星所在的圆柱体的截面称为第二矩形。
该第一矩形与该第二矩形之间的最短距离为：第一矩形端点中距离卫星坐标最近的点，与第二矩形端点中距离终端设备坐标最近的点之间的连线。具体的计算方法如下：
Figure PCTCN2020106776-appb-000011
Figure PCTCN2020106776-appb-000012
TA＝0.01497；
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，Dv表示终端设备的垂直定位误差，D h表示终端设备的水平定位误差，Ev表示卫星的垂直星历误差，E h表示卫星的水平星历误差，c表示光速常数。
本申请实施例中，确定定时提前的过程中考虑了终端设备的垂直定位误差、终端设备的水平定位误差、卫星的水平星历误差以及卫星的垂直星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
再次，当终端设备仅有二维定位能力时，终端设备获取的坐标无高度信息。以终端设备定位误差的范围为圆形，卫星星历误差的范围为球体的情况进行说明。这种情况是终端设备的定位误差包括水平定位误差，卫星的星历误差包括第一星历误差。
请参阅图11，图11为本申请实施例中一种确定定时提前的方法的另一个实施例示意 图。
以卫星位置距离终端设备所在的海拔高度为1200千米，即第一垂直距离(H)为1200千米；卫星的星下点与终端设备的距离为1913.6千米，即第一水平距离(S)为1913.6千米；卫星的第一星历误差(E)为6米；终端设备的水平定位误差(D h)为10千米的场景为例进行说明。
为了将终端设备的定位误差与卫星的星历误差考虑进确定定时提前的过程中，确定定时提前时选取的距离为终端设备与卫星之间的距离减去定位误差再减去星历误差。在图11对应的场景中，终端设备可能存在于以终端设备坐标为圆心，水平定位误差为半径的圆中的任意一点；卫星可能存在于以卫星坐标为球心，第一星历误差为半径形成的球型中的任意一点。
如图11所示，星下点与卫星坐标的连线，终端设备坐标与星下点的连线确定一个平面，在该平面内终端设备所在的圆的截面为长度2倍水平定位误差的线段，在该平面内卫星所在的球体的截面为圆形，该线段与该圆形之间的最短距离为：线段中距离卫星坐标最近的点与圆心相连并减去第一星历误差(圆形的半径)。具体的计算方法如下：
Figure PCTCN2020106776-appb-000013
Figure PCTCN2020106776-appb-000014
TA＝0.01500；
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D h表示终端设备的水平定位误差，E表示卫星的第一星历误差，c表示光速常数。
本申请实施例中，提供了在终端设备仅具有二维定位能力情况下，确定定时提前的方法。并且在确定定时提前的过程中考虑了终端设备的水平定位误差以及卫星的星历误差，使得通过预设规则确定的定时提前更贴近真实时延情况，保证终端设备根据该使用定时提前所发送的随机接入前导可在正确的时段到达卫星。
上述对本申请实施例提供的方案进行了介绍。可以理解的是，上述终端设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的模块及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对终端设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
下面对本申请中的对称设备进行详细描述，请参阅图12，图12为本申请实施例中终端设备的一种实施例示意图。终端设备10包括：
获取模块101，用于获取卫星的星历信息，其中，星历信息包括卫星坐标以及卫星的星历误差；
确定模块102，用于根据星历信息以及终端设备10的位置信息，通过预设规则确定定时提前，其中，终端设备10的位置信息包括终端设备10坐标以及终端设备10的定位误差，预设规则通过第一水平距离、第一垂直距离、星历误差以及定位误差确定，第一水平距离以及第一垂直距离由终端设备10坐标与卫星坐标计算得到。
在本申请的一些实施例中，终端设备10包括：
确定模块102，具体用于根据第一水平距离、第一垂直距离、终端设备10的第一定位误差以及卫星的第一星历误差确定定时提前，其中，星历误差包括卫星的第一星历误差，定位误差包括终端设备10的第一定位误差。
预设规则具体包括：
Figure PCTCN2020106776-appb-000015
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D表示终端设备10的第一定位误差，E表示卫星的第一星历误差，c表示光速常数。
在本申请的一些实施例中，终端设备10包括：
确定模块102，具体用于根据第一水平距离、第一垂直距离、终端设备10的水平定位误差、终端设备10的垂直定位误差以及卫星的第一星历误差确定定时提前，其中，定位误差包括终端设备10的水平定位误差以及终端设备10的垂直定位误差，星历误差包括卫星的第一星历误差。
预设规则具体包括：
Figure PCTCN2020106776-appb-000016
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D v表示终端设备10的垂直定位误差，D h表示终端设备10的水平定位误差，E表示卫星的第一星历误差，c表示光速常数。
在本申请的一些实施例中，终端设备10包括：
确定模块102，具体用于根据第一水平距离、第一垂直距离、终端设备10的水平定位误差、终端设备10的垂直定位误差、卫星的水平星历误差以及卫星的垂直星历误差确定定时提前，其中，定位误差包括终端设备10的水平定位误差以及终端设备10的垂直定位误差，星历误差包括卫星的水平星历误差以及卫星的垂直星历误差。
预设规则具体包括：
Figure PCTCN2020106776-appb-000017
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D v表示终端设备10的垂直定位误差，D h表示终端设备10的水平定位误差，Ev表示卫星的垂直星历误差，Eh表示卫星的水平星历误差，c表示光速常数。
在本申请的一些实施例中，终端设备10包括：
确定模块102，具体用于根据第一水平距离、第一垂直距离、终端设备10的水平定位误差以及卫星的第一星历误差确定定时提前，其中，定位误差包括终端设备10的水平定位 误差，星历误差包括卫星的第一星历误差。
预设规则具体包括：
Figure PCTCN2020106776-appb-000018
其中，TA表示定时提前，H表示第一垂直距离，S表示第一水平距离，D h表示终端设备10的水平定位误差，E表示卫星的第一星历误差，c表示光速常数。
在本申请的一些实施例中，终端设备10包括：
获取模块101，还用于获取公共定时提前，其中，公共定时提前由卫星发送；
确定模块102，还用于根据公共定时提前与定时提前，确定终端设备10中的使用定时提前；
确定模块102，还用于若公共定时提前大于定时提前，则确定公共定时提前为使用定时提前；
确定模块102，还用于若公共定时提前小于或等于定时提前，则确定定时提前为使用定时提前。
以上实施例中，确定模块可以由处理器实现，获取模块，可以由接收器或接收电路或输入接口实现。
需要说明的是，上述装置各模块/单元之间的信息交互、执行过程等内容，由于与本申请方法实施例基于同一构思，其带来的技术效果与本申请方法实施例相同，具体内容可参见本申请前述所示的方法实施例中的叙述，此处不再赘述。
如图13所示，为本申请实施例的终端设备的结构示意图，该终端设备可以包括：处理器1301(例如CPU)、存储器1302、发送器1304和接收器1303；发送器1304和接收器1303耦合至处理器1301，处理器1301控制发送器1304的发送动作和接收器1303的接收动作。存储器1302可能包含高速RAM存储器，也可能还包括非易失性存储器NVM，例如至少一个磁盘存储器，存储器1302中可以存储各种指令，以用于完成各种处理功能以及实现本申请实施例的方法步骤。可选的，本申请实施例涉及的终端设备还可以包括：电源1305、以及通信端口1306中的一个或多个，图13中所描述的各器件可以是通过通信总线连接，也可以是通过其他连接方式连接，对此，本申请实施例中不做限定。接收器1303和发送器1304可以集成在终端设备的收发器中，也可以为终端设备上分别独立的收、发天线。通信总线用于实现元件之间的通信连接。上述通信端口1306用于实现终端设备与其他外设之间进行连接通信。
在一些实施例中，终端设备中的处理器1301可以执行图12中确定模块102执行的动作，终端设备中的接收器1303可以执行图12中获取模块101执行的动作，其实现原理和技术效果类似，在此不再赘述。
在一些实施例中，上述存储器1302用于存储计算机可执行程序代码，程序代码包括指令；当处理器1301执行指令时，指令使处理器1301执行上述实施例中终端设备的处理模块执行的动作，在此不再赘述。
本申请还提供了一种芯片系统，请参阅图14，该芯片系统包括处理器1401、存储器1402，该存储器1402，用于保存终端设备必要的程序指令和数据。该芯片系统，可以由芯 片构成，也可以包含芯片和其他分立器件。
在一种可能的设计中，芯片系统还包括电源以及收发器(图14中未示出)，用于支持上述终端设备实现其所涉及的功能，例如，通过收发器接收上述方法实施例中所涉及的数据和/或信息，如终端设备的位置信息等。收发器在接收到上述方法实施例中所涉及的数据和/或信息后，将这些数据和/或信息发给处理器1401，以便处理器1401对这些数据和/或信息进行处理。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。
所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(Digital Subscriber Line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存储的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可 以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (24)

  1. 一种确定定时提前的方法，其特征在于，包括：
    获取卫星的星历信息，其中，所述星历信息包括卫星坐标以及所述卫星的星历误差；
    根据所述星历信息以及终端设备的位置信息，通过预设规则确定定时提前，其中，所述终端设备的位置信息包括终端设备坐标以及所述终端设备的定位误差，
    所述预设规则通过第一水平距离、第一垂直距离、所述星历误差以及所述定位误差确定，所述第一水平距离以及所述第一垂直距离由所述终端设备坐标与所述卫星坐标计算得到。
  2. 根据权利要求1所述的方法，其特征在于，所述根据所述星历信息以及所述终端设备的位置信息，通过所述预设规则确定所述定时提前，包括：
    根据所述第一水平距离、所述第一垂直距离、所述终端设备的第一定位误差以及所述卫星的第一星历误差确定所述定时提前，其中，所述星历误差包括所述卫星的所述第一星历误差，所述定位误差包括所述终端设备的所述第一定位误差。
  3. 根据权利要求2所述的方法，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100001
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述D表示所述终端设备的所述第一定位误差，所述E表示所述卫星的所述第一星历误差，所述c表示光速常数。
  4. 根据权利要求1所述的方法，其特征在于，所述根据所述星历信息以及所述终端设备的位置信息，通过所述预设规则确定所述定时提前，包括：
    根据所述第一水平距离、所述第一垂直距离、所述终端设备的水平定位误差、所述终端设备的垂直定位误差以及所述卫星的第一星历误差确定所述定时提前，其中，所述定位误差包括所述终端设备的所述水平定位误差以及所述终端设备的所述垂直定位误差，所述星历误差包括所述卫星的所述第一星历误差。
  5. 根据权利要求4所述的方法，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100002
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述Dv表示所述终端设备的所述垂直定位误差，所述Dh表示所述终端设备的所述水平定位误差，所述E表示所述卫星的所述第一星历误差，所述c表示光速常数。
  6. 根据权利要求1所述的方法，其特征在于，所述根据所述星历信息以及所述终端设备的位置信息，通过所述预设规则确定所述定时提前，包括：
    根据所述第一水平距离、所述第一垂直距离、所述终端设备的水平定位误差、所述终端设备的垂直定位误差、所述卫星的水平星历误差以及所述卫星的垂直星历误差确定所述定时提前，其中，所述定位误差包括所述终端设备的所述水平定位误差以及所述终端设备的所述垂直定位误差，所述星历误差包括所述卫星的所述水平星历误差以及所述卫星的所述垂直星历误差。
  7. 根据权利要求6所述的方法，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100003
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述Dv表示所述终端设备的所述垂直定位误差，所述Dh表示所述终端设备的所述水平定位误差，所述Ev表示所述卫星的所述垂直星历误差，所述Eh表示所述卫星的所述水平星历误差，所述c表示光速常数。
  8. 根据权利要求1所述的方法，其特征在于，所述根据所述星历信息以及所述终端设备的位置信息，通过所述预设规则确定所述定时提前，包括：
    根据所述第一水平距离、所述第一垂直距离、所述终端设备的水平定位误差以及所述卫星的第一星历误差确定所述定时提前，其中，所述定位误差包括所述终端设备的所述水平定位误差，所述星历误差包括所述卫星的所述第一星历误差。
  9. 根据权利要求8所述的方法，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100004
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述Dh表示所述终端设备的所述水平定位误差，所述E表示所述卫星的所述第一星历误差，所述c表示光速常数。
  10. 根据权利要求1-9中任一项所述的方法，其特征在于，所述通过所述预设规则确定所述定时提前之后，所述方法还包括:
    获取公共定时提前，其中，所述公共定时提前由所述卫星发送；
    根据所述公共定时提前与所述定时提前，确定所述终端设备中的使用定时提前；
    若所述公共定时提前大于所述定时提前，则确定所述公共定时提前为所述使用定时提前；
    若所述公共定时提前小于或等于所述定时提前，则确定所述定时提前为所述使用定时提前。
  11. 根据权利要求1-10中任一项所述的方法，其特征在于，所述卫星的所述星历误差由所述卫星广播发送。
  12. 一种终端设备，其特征在于，所述终端设备包括：
    获取模块，用于获取卫星的星历信息，其中，所述星历信息包括卫星坐标以及所述卫星的星历误差；
    确定模块，用于根据所述星历信息以及终端设备的位置信息，通过预设规则确定定时提前，其中，所述终端设备的位置信息包括终端设备坐标以及所述终端设备的定位误差，
    所述预设规则通过第一水平距离、第一垂直距离、所述星历误差以及所述定位误差确定，所述第一水平距离以及所述第一垂直距离由所述终端设备坐标与所述卫星坐标计算得到。
  13. 根据权利要求12的所述终端设备，其特征在于，
    所述确定模块，具体用于根据所述第一水平距离、所述第一垂直距离、所述终端设备的第一定位误差以及所述卫星的第一星历误差确定所述定时提前，其中，所述星历误差包括所述卫星的所述第一星历误差，所述定位误差包括所述终端设备的所述第一定位误差。
  14. 根据权利要求13的所述终端设备，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100005
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述D表示所述终端设备的所述第一定位误差，所述E表示所述卫星的所述第一星历误差，所述c表示光速常数。
  15. 根据权利要求12的所述终端设备，其特征在于，
    所述确定模块，具体用于根据所述第一水平距离、所述第一垂直距离、所述终端设备的水平定位误差、所述终端设备的垂直定位误差以及所述卫星的第一星历误差确定所述定时提前，其中，所述定位误差包括所述终端设备的所述水平定位误差以及所述终端设备的所述垂直定位误差，所述星历误差包括所述卫星的所述第一星历误差。
  16. 根据权利要求15的所述终端设备，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100006
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述Dv表示所述终端设备的所述垂直定位误差，所述Dh表示所述终端设备的所述水平定位误差，所述E表示所述卫星的所述第一星历误差，所述c表示光速常数。
  17. 根据权利要求12的所述终端设备，其特征在于，
    所述确定模块，具体用于根据所述第一水平距离、所述第一垂直距离、所述终端设备的水平定位误差、所述终端设备的垂直定位误差、所述卫星的水平星历误差以及所述卫星的垂直星历误差确定所述定时提前，其中，所述定位误差包括所述终端设备的所述水平定位误差以及所述终端设备的所述垂直定位误差，所述星历误差包括所述卫星的所述水平星历误差以及所述卫星的所述垂直星历误差。
  18. 根据权利要求17的所述终端设备，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100007
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述Dv表示所述终端设备的所述垂直定位误差，所述Dh表示所述终端设备的所述水平定位误差，所述Ev表示所述卫星的所述垂直星历误差，所述Eh表示所述卫星的所述水平星历误差，所述c表示光速常数。
  19. 根据权利要求12的所述终端设备，其特征在于，
    所述确定模块，具体用于根据所述第一水平距离、所述第一垂直距离、所述终端设备的水平定位误差以及所述卫星的第一星历误差确定所述定时提前，其中，所述定位误差包括所述终端设备的所述水平定位误差，所述星历误差包括所述卫星的所述第一星历误差。
  20. 根据权利要求19的所述终端设备，其特征在于，所述预设规则具体包括：
    Figure PCTCN2020106776-appb-100008
    其中，所述TA表示所述定时提前，所述H表示所述第一垂直距离，所述S表示所述第一水平距离，所述Dh表示所述终端设备的所述水平定位误差，所述E表示所述卫星的所述第一星历误差，所述c表示光速常数。
  21. 根据权利要求12-20中任一项的所述终端设备，其特征在于，
    所述获取模块，还用于获取公共定时提前，其中，所述公共定时提前由所述卫星发送；
    所述确定模块，还用于根据所述公共定时提前与所述定时提前，确定所述终端设备中的使用定时提前；
    所述确定模块，还用于若所述公共定时提前大于所述定时提前，则确定所述公共定时提前为所述使用定时提前；
    所述确定模块，还用于若所述公共定时提前小于或等于所述定时提前，则确定所述定时提前为所述使用定时提前。
  22. 根据权利要求12-21中任一项的所述终端设备，其特征在于，所述卫星的所述星历误差由所述卫星广播发送。
  23. 一种终端设备，其特征在于，包括：
    处理器，存储器；所述处理器、所述存储器之间进行相互的通信；
    所述存储器用于存储指令；
    所述处理器用于执行所述存储器中的所述指令，执行如权利要求1至11中任一项所述的方法。
  24. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求1至11中任意一项所述的方法。
PCT/CN2020/106776 2019-08-14 2020-08-04 一种确定定时提前的方法以及相关设备 WO2021027625A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/671,335 US11743854B2 (en) 2019-08-14 2022-02-14 Method and related device for determining timing advance

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910750187.XA CN112399548B (zh) 2019-08-14 2019-08-14 一种确定定时提前的方法以及相关设备
CN201910750187.X 2019-08-14

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/671,335 Continuation US11743854B2 (en) 2019-08-14 2022-02-14 Method and related device for determining timing advance

Publications (1)

Publication Number Publication Date
WO2021027625A1 true WO2021027625A1 (zh) 2021-02-18

Family

ID=74569254

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/106776 WO2021027625A1 (zh) 2019-08-14 2020-08-04 一种确定定时提前的方法以及相关设备

Country Status (3)

Country Link
US (1) US11743854B2 (zh)
CN (1) CN112399548B (zh)
WO (1) WO2021027625A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023102717A1 (zh) * 2021-12-07 2023-06-15 Oppo广东移动通信有限公司 通信方法及通信装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117083932A (zh) * 2021-03-30 2023-11-17 Oppo广东移动通信有限公司 信息传输方法、终端设备和网络设备
US11864142B2 (en) * 2021-03-31 2024-01-02 FG Innovation Company Limited User equipment and method for timing alignment
CN115701783A (zh) * 2021-06-02 2023-02-10 北京小米移动软件有限公司 卫星小区位置指示方法、装置、用户设备、网络侧设备及存储介质
WO2023082272A1 (zh) * 2021-11-15 2023-05-19 北京小米移动软件有限公司 一种上行同步方法、装置及可读存储介质
WO2023137585A1 (en) * 2022-01-18 2023-07-27 Nokia Shanghai Bell Co., Ltd. Mechanism for multi-interval discontinuous reception
CN117639881A (zh) * 2022-08-10 2024-03-01 华为技术有限公司 通信方法及装置
CN116528271B (zh) * 2023-06-28 2023-08-29 极芯通讯技术(南京)有限公司 自适应调整物理随机接入信道检测窗方法及其相关设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3110203A1 (fr) * 2015-06-23 2016-12-28 Thales Mesure de puissance dans un systeme de communication prennant compte de l'effet doppler
CN109842932A (zh) * 2017-11-24 2019-06-04 华为技术有限公司 获取时间提前量的方法与装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6343254B1 (en) * 1998-10-22 2002-01-29 Trimble Navigation Limited Seamless surveying system
CN102124362B (zh) * 2007-06-08 2014-10-01 高通股份有限公司 使用压力传感器的gnss定位
US20100106416A1 (en) * 2008-10-28 2010-04-29 Yochum Thomas E Aircraft navigation using the global positioning system, inertial reference system, and distance measurements
US8756001B2 (en) * 2011-02-28 2014-06-17 Trusted Positioning Inc. Method and apparatus for improved navigation of a moving platform
CN103379435B (zh) * 2012-04-28 2017-02-08 电信科学技术研究院 一种基于卫星移动通信系统的广播信息传输方法和设备
CN104536293B (zh) * 2014-12-09 2017-02-01 北京航空航天大学 一种星间相对运动误差消除方法
US10567905B2 (en) * 2017-11-27 2020-02-18 Qualcomm Incorporated Systems and methods for locating a mobile device using angle of arrival and inertial sensor measurements

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3110203A1 (fr) * 2015-06-23 2016-12-28 Thales Mesure de puissance dans un systeme de communication prennant compte de l'effet doppler
CN109842932A (zh) * 2017-11-24 2019-06-04 华为技术有限公司 获取时间提前量的方法与装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "On random access procedures for NTN", 3GPP DRAFT; R2-1907296 ON RANDOM ACCESS PROCEDURES FOR NTN, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Reno, Nevada, US; 20190513 - 20190517, 13 May 2019 (2019-05-13), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051730735 *
HUAWEI, HISILICON: "Consideration on additional measurements for RTK GNSS", 3GPP DRAFT; R1-1712109, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Prague, Czech Republic; 20170821 - 20170825, 20 August 2017 (2017-08-20), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051314929 *
HUAWEI, HISILICON: "Discussion on timing advance and RACH for NTN", 3GPP DRAFT; R1-1905994, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, USA; 20190513 - 20190517, 13 May 2019 (2019-05-13), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051727451 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023102717A1 (zh) * 2021-12-07 2023-06-15 Oppo广东移动通信有限公司 通信方法及通信装置

Also Published As

Publication number Publication date
US11743854B2 (en) 2023-08-29
CN112399548A (zh) 2021-02-23
US20220167297A1 (en) 2022-05-26
CN112399548B (zh) 2022-06-14

Similar Documents

Publication Publication Date Title
WO2021027625A1 (zh) 一种确定定时提前的方法以及相关设备
CN109792417B (zh) 高速lte部署的频率调整
US11792758B2 (en) Method and device for determining timing advance
US11902888B2 (en) System information for cell selection/reselection by an aerial UE
CN112787712B (zh) 面向低轨道卫星基站-飞行器用户终端的通信连接建立方法
US20220386389A1 (en) Communication Method and Communication Apparatus
US20220159732A1 (en) Random access method and device
US20240031965A1 (en) Information transmission method, terminal device, and network device
WO2022016376A1 (zh) 随机接入信息的处理方法、终端和网络设备
US20230156822A1 (en) Random access method and communication apparatus
CN113853023B (zh) 无线通信的方法及装置
WO2022078376A1 (zh) 一种更新参数的方法以及相关装置
WO2022028552A1 (zh) 一种通信方法及装置
WO2022052562A1 (zh) 定时偏移参数更新方法、设备及系统
WO2019154281A1 (zh) 信息指示的方法、通信装置和通信系统
US20240057005A1 (en) Communication parameter indication method and apparatus
US20230354438A1 (en) Wireless communication method and apparatus
WO2023104119A1 (zh) 数据传输方法、装置及设备
WO2023273783A1 (zh) 定位方法、装置及系统
CN113810095B (zh) 确定数字处理操作切分点的方法及装置
WO2024012298A1 (zh) 随机接入方法、装置及系统
US20230107781A1 (en) Reducing contention by improving the identification of the target of a response signal
WO2022062823A1 (zh) 波束管理方法、装置及系统
WO2021146836A1 (zh) 随机接入类型选择方法及装置
US20240179750A1 (en) Random access method and apparatus

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: 20852793

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: 20852793

Country of ref document: EP

Kind code of ref document: A1