WO2024031981A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2024031981A1
WO2024031981A1 PCT/CN2023/080871 CN2023080871W WO2024031981A1 WO 2024031981 A1 WO2024031981 A1 WO 2024031981A1 CN 2023080871 W CN2023080871 W CN 2023080871W WO 2024031981 A1 WO2024031981 A1 WO 2024031981A1
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WO
WIPO (PCT)
Prior art keywords
satellite
time period
terminal device
data
time
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PCT/CN2023/080871
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English (en)
Chinese (zh)
Inventor
陈莹
周建伟
乔云飞
杨若男
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华为技术有限公司
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Publication of WO2024031981A1 publication Critical patent/WO2024031981A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems

Definitions

  • the present application relates to the field of communication, and in particular, to a communication method and device.
  • Satellite communications have the advantages of wide coverage and being less susceptible to damage by natural disasters or external forces, and can provide better communication services.
  • terminal equipment needs to perform a random access process when switching satellites to achieve uplink synchronization. This will lead to problems with large signaling overhead and long delays. The problem.
  • Embodiments of the present application provide a communication method and device, which can reduce signaling overhead and transmission delay.
  • the first aspect is to provide a communication method.
  • the communication method includes: a terminal device receiving first information from a first satellite.
  • the first information is used to indicate the ephemeris information of the second satellite.
  • the terminal device determines the first timing advance amount according to the location of the terminal device and the first information.
  • the first timing advance amount is used to indicate: the length of time advanced by which the transmission delay of data sent by the terminal device to the second satellite is eliminated.
  • the terminal device can receive the first information from the first satellite in advance, and determine the first timing advance according to the location of the terminal device and the first information. In this way, the terminal device can switch before the satellite. , obtain the timing advance for sending data to the second satellite, avoid executing the random access process, thereby reducing signaling overhead and transmission delay.
  • the first timing advance includes the timing advance TA of the service link of the second satellite.
  • the first timing advance includes the TA of the service link of the second satellite and the TA of the feeder link.
  • the TA of the service link of the second satellite is used to indicate: the length of time in advance to eliminate the transmission delay of the data sent by the terminal device to the second satellite on the service link of the second satellite.
  • the TA of the feeder link It is used to indicate: the length of time in advance to eliminate the transmission delay of data sent by the terminal device to the second satellite on the feeder link of the second satellite. In this way, data can be sent to satellites with transparent transmission or non-transparent transmission architecture to improve adaptability.
  • the first information is also used to indicate the TA of the feeder link of the second satellite.
  • the first information is also used to indicate the time when the second satellite provides network services to the terminal device.
  • the method provided in the first aspect may further include: the terminal device provides network services to the terminal device according to the second satellite. time and the first timing to send data in advance. In this way, the terminal device can send data according to the first timing advance, thereby reducing signaling overhead and transmission delay.
  • the terminal device sends data according to the time when the second satellite provides network services to the terminal device and the first timing advance, which may include: the terminal device obtains the second timing advance.
  • the second timing advance amount Used to indicate: the length of time in advance to eliminate the transmission delay of the terminal device sending data to the first satellite.
  • the terminal device determines the overlapping time period of the first time period and the second time period based on the second timing advance, the time when the second satellite provides network services to the terminal device, and the first timing advance.
  • the first time period is a time period for sending the first part of the first data to the first satellite
  • the second time period is a time period for sending the second part of the first data to the second satellite.
  • the terminal device sends the data corresponding to the first sub-time period in the first part of the data to the first satellite, and sends the second part of the data to the second satellite.
  • the first sub-time period is a time period in the first time period excluding the overlapping time period.
  • the terminal device sends the first part of the data to the first satellite, and sends the data of the second part of the data corresponding to the second sub-time period to the second satellite.
  • the second sub-time period is a time period in the second time period excluding the overlapping time period. In this way, overlapping data transmission time periods can be avoided, interference between data can be reduced, and transmission success rate can be improved.
  • the method provided in the first aspect may further include: the terminal device receiving second information from the first satellite.
  • the second information is used to indicate the third time period, and the length of the third time period is: the time when the first satellite stops transmitting information or the time when the terminal device's scheduling waiting period ends, and the time when the second satellite receives data from the terminal device.
  • the terminal device sends data according to the time when the second satellite provides network services to the terminal device and the first timing advance, which may include: the terminal device sends data according to the third time period, the time when the second satellite provides network services to the terminal device and the first timing advance Send the first uplink data. In this way, the time for the second satellite to receive data can be delayed, thereby avoiding overlap of data sent by the terminal device to different satellites and improving communication efficiency.
  • the terminal device sends the first uplink data according to the third time period, the time when the second satellite provides network services to the terminal device and the first timing advance, which may include: if the sending time period of the first uplink data is different from the third time If there is an overlapping time period, the data corresponding to the third sub-time period in the first uplink data is sent to the second satellite, and the third sub-time period is the time period in the sending time period excluding the overlapping time period.
  • the method provided in the first aspect may further include: receiving third information from the first satellite.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the terminal device and the second satellite. If the second duration is less than the third duration, the terminal device performs downlink synchronization with the second satellite within the third duration after waiting for the second duration. In this way, both the downlink synchronization process and the waiting time for data transmission to the second satellite can be taken into account.
  • the method provided in the first aspect may further include: receiving third information from the first satellite.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the terminal device and the second satellite. If the second duration is greater than or equal to the third duration, the terminal device performs downlink synchronization with the second satellite within the second duration. In this way, both the downlink synchronization process and the waiting time for data transmission to the second satellite can be taken into account.
  • the method provided in the first aspect may further include: the terminal device receiving the synchronization signal and broadcast channel block SSB from the second satellite.
  • the SSB is used to indicate the physical cell identity PCI of the second satellite.
  • the terminal device obtains the PCI of the second satellite according to the SSB of the second satellite. In this way, when the PCI of the second satellite is the same as the PCI of the first satellite, the PCI of the second satellite can be obtained through the SSB, thereby reducing the data amount of the first information and further reducing the signaling overhead.
  • the first information can also be used to indicate the PCI of the second satellite.
  • the terminal device can avoid obtaining PCI according to the SSB, simplifying the processing process of the terminal device.
  • the first information includes dedicated signaling of the terminal device, and the time when the second satellite provides network services to the terminal device can be carried in one or more of the following items of the terminal device: RRC signaling, MAC CE, or DCI.
  • RRC signaling MAC CE
  • DCI DCI
  • the time for the terminal device to perform downlink synchronization is carried in one or more of the following: RRC signaling, MAC CE, or DCI.
  • the second aspect is to provide a communication method.
  • the communication method includes: a first satellite determining first information.
  • the first satellite sends first information to the terminal device.
  • the first information is used to indicate the ephemeris information of the second satellite.
  • the first satellite is a satellite that currently provides network services to the terminal device
  • the second satellite is a satellite that the terminal device is about to switch to.
  • the method provided in the second aspect may further include: the first satellite sending second information to the terminal device.
  • the second information is used to indicate the third time period
  • the length of the third time period is: the time when the first satellite stops transmitting information or the time when the terminal device's scheduling waiting period ends and the second satellite receives the signal from the terminal device. The length of time between the start times of upstream data.
  • the first information can also be used to indicate the PCI of the second satellite.
  • the method provided in the second aspect may further include: the first satellite sending third information to the terminal device.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the terminal device and the second satellite.
  • a communication device in a third aspect, includes: a transceiver module and a processing module.
  • the transceiver module is used to receive the first information from the first satellite.
  • the first information is used to indicate the ephemeris information of the second satellite.
  • a processing module configured to determine a first timing advance according to the location of the communication device and the first information.
  • the first timing advance amount is used to indicate: a length of time in advance to eliminate the transmission delay of data sent by the communication device to the second satellite.
  • the first satellite is a satellite that currently provides network services to the communication device
  • the second satellite is a satellite that the communication device is about to switch to.
  • the first timing advance includes the timing advance TA of the service link of the second satellite.
  • the first timing advance includes the TA of the service link of the second satellite and the TA of the feeder link.
  • the TA of the service link of the second satellite is used to indicate: the length of time in advance to eliminate the transmission delay of the data sent by the communication device to the second satellite on the service link of the second satellite.
  • the TA of the feeder link It is used to indicate: the length of time advanced by which the transmission delay of the data sent by the communication device to the second satellite on the feeder link of the second satellite is eliminated.
  • the first information is also used to indicate the TA of the feeder link of the second satellite.
  • the first information is also used to indicate the time when the second satellite provides network services for the communication device
  • the transceiver module is also used to provide the network service for the communication device based on the second satellite and the first timing advance. transfer data.
  • the transceiver module is specifically configured to obtain the second timing advance of the first satellite. Determine the first time period based on the second timing advance, the time when the second satellite provides network services to the communication device, and the first timing advance The overlapping time period with the second time period.
  • the first time period is a time period for sending the first part of the first data to the first satellite
  • the second time period is a time period for sending the second part of the first data to the second satellite.
  • the communication device sends the data in the first part of the data corresponding to the first sub-time period to the first satellite, and sends the second part of the data to the second satellite;
  • first The sub-time end is the time period in the first time period except the overlapping time period.
  • the communication device sends the first part of the data to the first satellite, and sends the data of the second part of the data corresponding to the second sub-time period to the second satellite.
  • the second sub-time period is a time period in the second time period excluding the overlapping time period.
  • the second timing advance amount is used to indicate the length of time advanced by which the transmission delay of data sent by the communication device to the first satellite is eliminated.
  • the transceiver module is also configured to receive the second information from the first satellite.
  • the second information is used to indicate the third time period, and the length of the third time period is: the time when the first satellite stops transmitting information or the time when the communication device ends the scheduling waiting period and the time when the second satellite receives the signal from the communication device.
  • the length of time between the start times of upstream data is specifically configured to send the first uplink data according to the third time period, the time when the second satellite provides network services to the communication device, and the first timing advance. Wherein, the time length between the time when the communication device starts sending the fifth data to the second satellite and the second time is less than or equal to the first timing advance.
  • the transceiver module is specifically configured to: when there is an overlapping time period between the sending time period of the first uplink data and the third time period, send the first uplink data and the third sub-time period to the second satellite.
  • the third sub-time period is a time period in the sending time period except the overlapping time period.
  • the transceiver module is also used to receive third information from the first satellite.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the communication device and the second satellite. If the second duration is less than the third duration, the communication device performs downlink synchronization with the second satellite within the third duration after waiting for the second duration.
  • the transceiver module is also used to receive third information from the first satellite.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the communication device and the second satellite. If the second time period is greater than or equal to the third time period, the communication device performs downlink synchronization with the second satellite within the second time period.
  • the transceiver module is also used to receive the synchronization signal and broadcast channel block SSB from the second satellite.
  • the SSB is used to indicate the physical cell identity PCI of the second satellite.
  • the processing module is also used to obtain the PCI of the second satellite based on the SSB of the second satellite.
  • the first information can also be used to indicate the PCI of the second satellite.
  • the first information includes dedicated signaling of the communication device, and the time when the second satellite provides network services to the communication device can be carried in one or more of the following: RRC signaling, MAC CE, or DCI .
  • the time for the communication device to perform downlink synchronization is carried in one or more of the following: RRC signaling, MAC CE, or DCI.
  • the transceiver module may include a receiving module and a sending module. Wherein, the transceiver module is used to implement the sending function and receiving function of the communication device described in the third aspect.
  • the communication device described in the third aspect may further include a storage module that stores programs or instructions.
  • the processing module executes the program or instruction, the communication device can perform the communication method described in the first aspect.
  • the communication device described in the third aspect may be a terminal device, or may be a chip that can be disposed in the terminal device. (system) or other components or components, it may also be a device including terminal equipment, which is not limited in this application.
  • a fourth aspect provides a communication device.
  • the communication device includes: a processing module and a transceiver module.
  • the processing module is used to determine the first information.
  • the transceiver module is used to send the first information to the terminal device.
  • the first information is used to indicate the ephemeris information of the second satellite.
  • the communication device is a satellite currently providing network services to the terminal device, and the second satellite is a satellite to which the terminal device is about to switch.
  • the transceiver module is also used to send second information to the terminal device.
  • the second information is used to indicate the first time period
  • the length of the third time period is: the time when the communication device stops transmitting information or the time when the terminal equipment's scheduling waiting period ends and the second satellite receives the uplink signal from the terminal equipment. The length of time between the starting moments of the data.
  • the first information can also be used to indicate the PCI of the second satellite.
  • the transceiver module is also used to send third information to the terminal device.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the terminal device and the second satellite.
  • the transceiver module may include a receiving module and a sending module. Wherein, the transceiver module is used to implement the sending function and receiving function of the communication device described in the fourth aspect.
  • the communication device described in the fourth aspect may further include a storage module that stores programs or instructions.
  • the processing module executes the program or instruction, the communication device can perform the communication method described in the second aspect.
  • the communication device described in the fourth aspect may be the first satellite, or it may be a chip (system) or other component or component that can be installed in the first satellite, or it may be a device including the first satellite, which is not the case in this application. Make limitations.
  • a communication device is provided.
  • the communication device is used to perform the communication method described in any one of the first to second aspects.
  • the communication device described in the fifth aspect may be the terminal device described in the first aspect or the first satellite described in the second aspect, or may be a chip (system) provided in the terminal device or the first satellite. ) or other parts or components, or the device containing the terminal equipment or first satellite.
  • the communication device described in the fifth aspect includes modules, units, or means corresponding to implementing the communication method described in any one of the first to second aspects.
  • the modules, units, or means may Implemented through hardware, implemented through software, or corresponding software implemented through hardware.
  • the hardware or software includes one or more modules or units for performing the functions involved in the above communication method.
  • a sixth aspect provides a communication device.
  • the communication device includes: a processor, the processor is configured to execute the communication method described in any one of the possible implementations of the first to second aspects.
  • the communication device described in the sixth aspect may further include a transceiver. Should send and receive The device can be a transceiver circuit or an interface circuit. The transceiver can be used for the communication device described in the sixth aspect to communicate with other communication devices.
  • the communication device described in the sixth aspect may further include a memory.
  • This memory can be integrated with the processor or provided separately.
  • the memory may be used to store computer programs and/or data involved in the communication method described in any one of the first to second aspects.
  • the communication device described in the sixth aspect may be the terminal device in the first aspect or the first satellite in the second aspect, or may be a chip (system) disposed in the terminal device or the first satellite or Other parts or components, or devices containing the terminal equipment or first satellite.
  • a communication device in a seventh aspect, includes: a processor, the processor is coupled to a memory, and the processor is used to execute a computer program stored in the memory, so that the communication device executes any one of the possible implementation methods of the first aspect to the second aspect. communication method.
  • the communication device described in the seventh aspect may further include a transceiver.
  • the transceiver can be a transceiver circuit or an interface circuit.
  • the transceiver can be used for the communication device described in the seventh aspect to communicate with other communication devices.
  • the communication device described in the seventh aspect may be the terminal device in the first aspect or the first satellite in the second aspect, or may be a chip (system) disposed in the terminal device or the first satellite or Other parts or components, or devices containing the terminal equipment or first satellite.
  • a communication device including: a processor and a memory; the memory is used to store a computer program, and when the processor executes the computer program, the communication device performs the first to second aspects. any implementation of the communication method.
  • the communication device described in the eighth aspect may further include a transceiver.
  • the transceiver can be a transceiver circuit or an interface circuit.
  • the transceiver can be used for the communication device described in the eighth aspect to communicate with other communication devices.
  • the communication device described in the eighth aspect may be the terminal device in the first aspect or the first satellite in the second aspect, or may be a chip (system) disposed in the terminal device or the first satellite or Other parts or components, or devices containing the terminal equipment or first satellite.
  • a communication device including: a processor; the processor is configured to be coupled to a memory, and after reading the computer program in the memory, execute the steps in the first to second aspects according to the computer program. Any communication method described in the implementation method.
  • the communication device described in the ninth aspect may further include a transceiver.
  • the transceiver can be a transceiver circuit or an interface circuit.
  • the transceiver can be used for the communication device described in the ninth aspect to communicate with other communication devices.
  • the communication device described in the ninth aspect may be the terminal device in the first aspect or the second aspect
  • the first satellite in the terminal device or a chip (system) or other components or components that can be disposed in the terminal device or the first satellite, or a device including the terminal device or the first satellite.
  • a processor configured to execute the communication method described in any possible implementation manner from the first aspect to the second aspect.
  • a communication system in an eleventh aspect, includes one or more terminal devices and one or more first satellites.
  • a computer-readable storage medium including: a computer program or instructions; when the computer program or instructions are run on a computer, the computer is caused to execute any one of the possible methods from the first aspect to the second aspect. Implement the communication method described in the manner.
  • a computer program product including a computer program or instructions.
  • the computer program or instructions When the computer program or instructions are run on a computer, the computer is caused to execute any one of the possible implementation methods of the first aspect to the second aspect. the communication method described above.
  • Figure 1 is a schematic diagram of the coverage range of the gaze mode provided by the embodiment of the present application.
  • Figure 2 is a schematic architectural diagram of a communication system provided by an embodiment of the present application.
  • Figure 3 is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 4 is a schematic diagram of data transmission provided by an embodiment of the present application.
  • Figure 5 is another schematic diagram of data transmission provided by an embodiment of the present application.
  • Figure 6 is another schematic diagram of data transmission provided by an embodiment of the present application.
  • Figure 7 is another schematic diagram of data transmission provided by an embodiment of the present application.
  • Figure 8 is another schematic diagram of data transmission provided by an embodiment of the present application.
  • Figure 9 is another schematic diagram of data transmission provided by an embodiment of the present application.
  • Figure 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • Figure 11 is a schematic second structural diagram of a communication device provided by an embodiment of the present application.
  • Timing Advance It can also be called timing advance, which refers to the transmission delay caused by distance when the uplink signal of the terminal device reaches the network device.
  • the terminal sends an uplink signal, it needs to compensate the uplink signal according to the TA to achieve alignment of the uplink signal at the uplink synchronization point. For example, if the terminal device sends an uplink signal to the network device and hopes that the uplink signal reaches the network device at time T1, and the transmission delay between the terminal device and the network device is TA1, the terminal device can send the uplink signal at time T1-TA1.
  • the satellite can be used as a network device, such as a base station, or as a transparent forwarding node.
  • the uplink signal is synchronized on the satellite side, that is, the satellite is the uplink synchronization point.
  • the uplink synchronization point can be the satellite, it can be a network device, such as a base station, or it can be one of the wireless links (feeder links) from the satellite to the ground network equipment.
  • TA is the transmission delay between the terminal device and the uplink synchronization node.
  • TA when the satellite serves as a node for transparent forwarding, TA may include the TA of the service link and the transmission delay between the terminal device and the satellite.
  • the terminal can determine the TA of the service link based on its own position and satellite ephemeris.
  • TAs may include TAs for service links and TAs for public links.
  • the TA of the public link refers to the delay from the satellite to the synchronization point.
  • the TA of the feeder link is the same, and the satellite can broadcast the TA of the satellite's feeder link to the terminal equipment within the satellite's service area.
  • Gaze mode The satellite adjusts the beam direction through beam forming to serve the same service area. When the satellite elevation angle is greater than the elevation angle threshold and switching is required, all users in the service area switch to the next satellite.
  • the service area of satellite 1 is area A.
  • satellite 2 adjusts the beam direction through beam forming, so that the satellite The service area of 2 is area A.
  • the elevation threshold can be 30 degrees, or 40 degrees. In specific implementation, the elevation angle threshold can be determined according to specific scenarios, which will not be described again here.
  • Non-gazing mode The satellite hardly adjusts the beam direction significantly.
  • the satellite beam corresponding to the service area on the ground moves with the movement of the satellite. Therefore, users at different locations in the same service area do not switch to the next one at the same time. star.
  • Non-terrestrial communication networks include nodes such as satellite networks, high-altitude platforms, and drones. They have significant advantages such as global coverage, long-distance transmission, flexible networking, easy deployment, and are not restricted by geographical conditions. They have been It is widely used in many fields such as maritime communications, positioning and navigation, disaster relief, scientific experiments, video broadcasting and earth observation.
  • the 5th generation (5G) terrestrial mobile network and satellite network are integrated to complement each other's strengths and form an integrated integrated communication network of sea, land, air, space and ground with seamless global coverage to meet the needs of users everywhere. business needs.
  • Satellite networks exhibit heterogeneous characteristics. They have developed from traditional single-layer communication networks to multi-layer communication networks. The functions of communication satellite networks have also become more complex and diversified. They are gradually compatible with and support navigation enhancement, earth observation, and multi-dimensional information on-orbit processing. and other functions.
  • Satellite communication systems can be integrated with traditional mobile communication systems.
  • the mobile communication system may be a fourth generation (4G) communication system (for example, a long term evolution (LTE) system), a global interoperability for microwave access (WiMAX) communication systems, 5G communication systems (for example, new radio (NR) systems), and future mobile communication systems, etc.
  • 4G fourth generation
  • LTE long term evolution
  • WiMAX global interoperability for microwave access
  • 5G communication systems for example, new radio (NR) systems
  • future mobile communication systems etc.
  • At least one refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the related objects are in an “or” relationship.
  • “At least one of the following” or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items).
  • At least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a, b, and c.
  • a, b, c can be single or multiple.
  • Satellite communications have unique advantages over terrestrial communications. For example, satellite communications can provide wider coverage; satellites are not easily damaged by natural disasters or external forces.
  • the introduction of satellite communications into communication systems, such as 5G communication systems can provide communication services for areas such as oceans and forests that cannot be covered by terrestrial communication networks, thereby enhancing the reliability of communication. For example, it can ensure that aircraft, trains, and other means of transportation can Users can obtain better communication services; in addition, it can also provide more resources for transmitting data and increase the speed of the network.
  • Satellite communications have been introduced in the 3rd generation partner project (3GPP) standards.
  • the communication system that introduced satellite communication can also be called NTN.
  • Communication systems that introduce satellite communications can not only support various terminal devices in 5G communication scenarios, but also support Internet of Things (IoT) type terminal devices.
  • IoT Internet of Things
  • NT terrestrial network
  • the terminal device when a terminal device performs satellite switching, the terminal device usually needs to re-initiate random access to the target satellite to achieve uplink synchronization (uplink time-frequency synchronization).
  • uplink synchronization uplink time-frequency synchronization
  • the terminal equipment due to the fast movement of satellites, the terminal equipment needs to frequently perform satellite switching. In this way, the terminal equipment needs to frequently perform random access procedures, resulting in high signaling overhead.
  • the terminal device switches satellites during the process of transmitting data
  • the unfinished data transmitted on the source satellite will need to be transmitted on the target satellite after the random access process is completed, which will cause data delay. Big question.
  • the current protocol supports a very large number of repetitions. It takes a long time to transmit a transport block (TB). The data delay problem caused by satellite switching is more obvious.
  • the communication system in the embodiment of the present application may include a transparent satellite architecture and a non-transparent satellite architecture.
  • Transparent transmission is also called elbow forwarding transmission, that is, the signal only undergoes frequency conversion, signal amplification and other processes on the satellite.
  • the satellite is transparent to the signal, as if it does not exist.
  • Non-transparent transmission can be called regenerative (on-board access/processing) transmission, that is, the satellite has some or all base station functions.
  • the satellite mentioned in the embodiment of this application may be a satellite base station, may also include an orbiting receiver or repeater for relaying information, or may be a network-side device mounted on the satellite; the satellite may be a low-earth Orbit (low earth orbit, LEO) satellite, medium earth orbit (medium orbit earth satellite, MEO) satellite, high earth orbit (high earth orbit satellite, HEO) satellite, geostationary earth orbit (geostationary earth orbit, GEO) satellite and non-geostationary orbit (non-GEO, NGEO) satellites, etc.
  • LEO low-earth Orbit
  • MEO medium earth orbit
  • high earth orbit satellite, HEO high earth orbit
  • GEO geostationary earth orbit
  • non-GEO, NGEO non-geostationary orbit
  • FIG. 2 is a schematic architectural diagram of a communication system to which the communication method provided by the embodiment of the present application is applicable.
  • the communication system includes a terminal device 201, at least one satellite (202a to 202f), at least one connection device (203a, 203b), and a core network 205.
  • the terminal device 201 can establish a communication connection with the satellites (202a to 202f) in a wireless manner.
  • the satellite 202a is connected with the connection device 203a.
  • the connection device 203a is connected with the network device 204.
  • the network device 204 is connected with the core network (core).
  • the satellite 202d is communication connection with the connection device 203b
  • the connection device 203b is communication connection with the core network 205
  • the core network 205 is communication connection with the data network 206.
  • communication connections can be established between satellite 202a and satellite 202b, and between satellite 202a and satellite 202c.
  • Communication connections can be established between satellite 202d and satellite 202e, and between satellite 202d and satellite 202f.
  • the terminal device 201 can communicate with the satellites (202a to 202f) through the air interface.
  • the satellite 202a and the connection device 203a can communicate through the air interface, and the network device 204 and the core network 205 can communicate through the NG interface.
  • the satellite 202b and the connection device 203b can communicate through the air interface, and the connection device 203b and the core network 205 can communicate through the NG interface.
  • the satellite 202e and the satellite 202d can communicate through the Xn interface. That is to say, the satellite 202a can adopt a transparent transmission satellite architecture, that is, the satellite 202a is used for transparent transmission of signals.
  • the satellite 202b may adopt a non-transparent satellite architecture, which is used to implement some or all functions of network equipment.
  • the above-mentioned satellite 202a can also adopt a non-transparent satellite architecture.
  • a non-transparent satellite architecture shown in Figure 2, which will not be described again here.
  • the above-mentioned satellite 202b may also adopt a transparent transmission satellite architecture.
  • a transparent transmission satellite architecture please refer to the implementation principle of the satellite 202a using a transparent transmission satellite architecture, which will not be described again here.
  • satellites in the above communication system can also be aircraft, unmanned aerial systems (unmanned aerial systems, UAS), drones, etc.
  • unmanned aerial systems unmanned aerial systems, UAS
  • drones etc.
  • the above-mentioned network device is a device located on the network side of the above-mentioned communication system and having a wireless transceiver function, or a chip or chip system that can be installed on the device.
  • the network equipment includes but is not limited to: satellites, aircraft or unmanned aerial systems (UAS).
  • the network device may be a device installed on a satellite, aircraft or UAS and has a wireless transceiver function, or a chip or chip system that may be installed on the device.
  • the network device may be an evolved Node B (eNB), a radio network controller (RNC), a Node B (Node B, NB), or a base station controller (BSC).
  • eNB evolved Node B
  • RNC radio network controller
  • Node B Node B
  • BSC base station controller
  • base transceiver station BTS
  • baseband unit BBU
  • wireless relay node wireless backhaul node
  • transmission point transmission and reception point
  • TRP or transmission point TP
  • 5G such as a gNB in a new radio (NR) system, or a transmission point (TRP or TP), one or a group (including multiple antenna panels) of antenna panels of a base station in a 5G system, or, It can also be a network node that constitutes a gNB or transmission point, such as a baseband unit (BBU), or a distributed unit (DU), etc.
  • BBU baseband unit
  • DU distributed unit
  • the above-mentioned terminal device is a terminal that is connected to the above-mentioned communication system and has a wireless transceiver function, or a chip or chip system that can be installed on the terminal.
  • the terminal equipment may also be referred to as satellite television receiver, user device, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication equipment, user Agent or user device.
  • the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal device, or an augmented reality (AR) terminal.
  • VR virtual reality
  • AR augmented reality
  • the terminal device of this application can also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit built into the vehicle as one or more components or units.
  • the vehicle uses the built-in vehicle-mounted module, vehicle-mounted module, Vehicle-mounted components, vehicle-mounted chips or vehicle-mounted units can implement the frequency offset compensation method provided by this application.
  • the core network can be used for user access control, mobility management, session management, user authentication, accounting and other services. It is composed of multiple functional units, which can include functional entities of the control plane and functional entities of the data plane.
  • the functional entities of the control plane may include access and mobility management function (AMF) entities.
  • AMF access and mobility management function
  • the AMF entities are responsible for user access management, authentication, mobility management and other functions.
  • the user plane function (UPF) is responsible for managing user plane data transmission, traffic statistics and other functions.
  • connection device which can also be called a ground station or gateway, is responsible for forwarding signaling and business data between the satellite base station and the core network.
  • the air interface refers to the wireless link between the terminal and the base station.
  • Xn interface refers to the interface between base stations and is mainly used for signaling interactions such as handovers.
  • the NG interface refers to the interface between the base station and the core network, which mainly interacts with NAS and other signaling of the core network, as well as user business data.
  • the above-mentioned Xn interface and NG interface may have different names.
  • the Xn interface is called the X2 interface and the NG interface is the S1 interface.
  • any one of the satellites 202a to 202b shown in FIG. 2 can be Works in gaze mode or non-gaze mode.
  • the communication method provided by the embodiments of the present application can be applied between the terminal device and the satellite shown in Figure 2.
  • the satellite 202a is used as a transparent transmission, and the satellite 202d includes part or all of the functions of the base station.
  • the satellite 202a includes part or all of the functions of the base station, and/or, Satellite 202d is transparent transmission, so I won’t go into details here.
  • FIG. 3 is a schematic flowchart of a communication method provided by an embodiment of the present application. This communication method can be applied to communication between the terminal device and the satellite shown in Figure 2.
  • the communication method includes the following steps:
  • the first satellite sends the first information.
  • the terminal device receives the first information.
  • the first information is used to indicate the ephemeris information of the second satellite.
  • the first information may also include measurement configuration information of the second satellite, where the measurement configuration information may include one or more of the following of the second satellite: transmission power, power threshold, neighboring cell frequency, frequency point, satellite of the neighboring satellite Calendar, or measure time.
  • the first satellite may be a satellite that the terminal device currently provides network services to
  • the second satellite may be a satellite that the terminal device is about to switch to.
  • the first satellite may be the satellite 202a in the above-mentioned FIG. 2, and the second satellite may be any one of the satellite 202d, the satellite 202e, or the satellite 202f in the above-mentioned FIG. 2.
  • the first satellite may be the satellite 202d in FIG. 2
  • the second satellite may be any one of the satellites 202a, 202b, or 202c in FIG. 2.
  • the first satellite may be one of the satellites 202b and 202c shown in Figure 2.
  • the second satellite is the satellite 202b, the satellite 202c except the first satellite, and the satellites 202d to 202c.
  • the first satellite may be one of the satellites 202e and 202f shown in FIG. 2
  • the second satellite may be any one of the satellites 202e, 202f except the first satellite, and the satellites 202a to 202c. satellite.
  • the ephemeris information of the second satellite is used to indicate: the operation information of the second satellite.
  • the relevant coordinate information of the second satellite such as the coordinate information of the second satellite based on earth-centered, earth-fixed, ECEF, or earth-centered inertial coordinate information, and Orbital information.
  • the ECEF coordinate information may include: three-point coordinates, speed and time related to the second satellite.
  • the ECI coordinate information may include: three-point coordinates, speed and time related to the second satellite.
  • Orbital information includes: ascending node right ascension, orbital inclination, orbital semi-major axis, orbital eccentricity, perigee angle and true periapsis angle.
  • the physical cell identifier (PCI) of the terminal device may not change before and after switching satellites, that is, the PCI of the first satellite is different from the PCI of the second satellite after the switching.
  • the terminal device can avoid acquiring the PCI of the second satellite here.
  • the scrambling information of the data transmitted between the terminal device and the satellite can be determined based on PCI.
  • the terminal device can obtain the PCI through the first information. That is to say, the first information can also include the PCI of the second satellite.
  • PSS primary synchronization signal
  • the terminal device can also obtain the PCI by itself.
  • the terminal device receives a synchronization signal and physical broadcast channel block (SSB) from the second satellite.
  • the terminal device obtains the physical cell identity PCI of the second satellite according to the SSB of the second satellite.
  • SSB physical broadcast channel block
  • the first satellite may also send other broadcast messages besides SSB to the terminal device.
  • the terminal device may receive other broadcast messages other than SSB from the first satellite.
  • the PCI may not change before and after the terminal device switches satellites, that is, the PCI of the first satellite is the same as the PCI of the second satellite after switching.
  • the first information may be carried in dedicated signaling of the terminal device, such as one or more of the following: broadcast message, radio resource control (RRC) signaling, media access control (RRC) signaling. medium access control (MAC)-control element (CE), downlink control information (DCI).
  • RRC radio resource control
  • RRC media access control
  • CE medium access control element
  • DCI downlink control information
  • part of the first information such as the time when the second satellite provides network services to the terminal device, can be carried in the dedicated signaling of the terminal device.
  • the dedicated signaling of the terminal device can also be used to indicate the time of downlink synchronization.
  • the first satellite and the second satellite both adopt a staring mode, or both adopt a non-glaring mode to provide network services.
  • the terminal device determines the first timing advance based on the location of the terminal device and the first information.
  • the first timing advance amount is used to indicate: a length of time in advance to eliminate the transmission delay of data sent by the terminal device to the second satellite.
  • the location of the terminal device can be determined according to existing technology.
  • the location of the terminal device may be determined by the terminal device according to a global navigation satellite system (GNSS).
  • GNSS global navigation satellite system
  • the location of the terminal device may be measured based on a reference signal of a network device that provides network services to the terminal device, such as the first satellite.
  • the service link refers to the communication link between the terminal device and the satellite.
  • the service link corresponding to the second satellite refers to the communication link between the terminal device and the second satellite.
  • the terminal device may determine the position of the second satellite according to the ephemeris information of the second satellite, and determine the first distance between the terminal device and the second satellite according to the position of the terminal device and the position of the second satellite, and then determine the first distance between the terminal device and the second satellite according to the position of the second satellite.
  • the first distance and the propagation speed of the electromagnetic wave such as the speed of light, determine the timing advance of the service link of the second satellite.
  • the first timing advance may include the TA of the service link.
  • the first timing advance includes the TA of the service link between the terminal device and satellite 204d.
  • the first timing advance includes the service of the second satellite.
  • the first timing advance includes the TA of the service link between the terminal device and the satellite 204a, and the TA of the feed link between the satellite 204a and the network device 204.
  • the TA of the feeder link of the second satellite may be indicated by the first information.
  • the first information may carry the TA of the feeder link of the second satellite.
  • the second satellite may carry the round trip delay on the second satellite's feeder link.
  • the TA of the service link of the second satellite is used to indicate: the length of time in advance to eliminate the transmission delay of the data sent by the terminal device to the second satellite on the service link of the second satellite, the feed link of the second satellite.
  • the TA is used to indicate: the length of time in advance to eliminate the transmission delay of the data sent by the terminal device to the second satellite on the feeder link of the second satellite.
  • the terminal device can receive the first information from the first satellite in advance, and determine the first timing advance according to the location of the terminal device and the first information. In this way, the terminal device can, before switching satellites, The timing advance for sending data to the second satellite is obtained to avoid performing a random access process, thereby reducing signaling overhead and transmission delay.
  • the first information can also be used to indicate the time when the second satellite provides network services to the terminal device.
  • the time when the second satellite provides network services to the terminal device may be carried in the terminal device's UE-specific signaling, such as RRC signaling, MAC CE, and DCI.
  • UE-specific signaling such as RRC signaling, MAC CE, and DCI.
  • the method provided in Figure 3 may also include S303.
  • S303 The terminal device sends data according to the time when the second satellite provides network services to the terminal device and the first timing advance.
  • the terminal device can transmit data according to the following method 1 or method 2.
  • the terminal device transmits data according to the time when the second satellite provides network services to the terminal device and the first timing advance, which may include: the terminal device obtains the second timing advance of the first satellite.
  • the terminal device determines the overlapping time period of the first time period and the second time period based on the second timing advance of the first satellite, the time when the second satellite provides network services to the terminal device, and the first timing advance.
  • the first time period is a time period for sending the first part of the first data to the first satellite
  • the second time period is a time period for sending the second part of the first data to the second satellite.
  • the terminal device sends the data corresponding to the first sub-time period in the first part of the data to the first satellite, and sends the second part of the data to the second satellite.
  • the first sub-time period is a time period in the first time period excluding the overlapping time period.
  • the first part of the data is sent to the first satellite, and the data of the second part of the data corresponding to the second sub-time period is sent to the second satellite.
  • the second sub-time period is a time period in the second time period excluding the overlapping time period.
  • part of the data in the first part of the data over the overlapping time period may be discarded, or part of the data in the second part of the data over the overlapping time period may be discarded.
  • the first data is data that the terminal device needs to send.
  • the timing advance of the terminal device for sending different parts of the first data is the same.
  • the time period for the first satellite to receive the first data is between T0-2ms and T0+2ms.
  • the second timing advance corresponding to the first satellite is 2 milliseconds (milliseconds, ms), and the terminal device sends the first data in the time period between T0-4ms and T0 time.
  • the first part of the data in the first data and the second part of the data in the first data may be determined based on the time when the satellite is switched. For example, if the time when the terminal device switches satellites is T0 and the second timing advance is 2ms, then the first part of the first data is the data before T0-2ms in the first data without switching satellites. The second part of the first data is the data located after T0-2ms in the first data without switching satellites.
  • the first duration threshold can be 10 orthogonal frequency division multiplexing (OFDM) symbols, or 10 sampling points.
  • OFDM orthogonal frequency division multiplexing
  • the acquisition principle of the second timing advance can refer to the implementation principle of the timing advance in the prior art, which will not be described again here.
  • the time period for the terminal device to send the first part of data to the first satellite is: T0 - second timing advance - first data
  • the time period for the terminal device to send the second part of data to the second satellite is: T0 - the first timing advance to T0 - the first timing advance + the second data between durations.
  • the terminal device switches satellites at time T0, the first timing advance of the first satellite is 2ms, and the second timing advance of the second satellite is 2.5ms.
  • the terminal device needs to transmit The total duration of the data is 5ms. If the time length of the first time period is 2ms and the time length of the second time period is 2ms, then the first time period is: the time between T0-2ms-2ms and T0-2ms segment, that is, the time period between T0-4ms and T-2ms.
  • the second time period is: the time period between T0-2.5ms and T0-2.5ms+2ms, that is, the time period between T0-2.5ms and T0-0.5ms.
  • the time period between T0-2.5ms and T0-2ms is the overlapping time period.
  • the time period between T0-4ms and T0-2.5ms is the first sub-time period.
  • the time period between T0-2ms and T0-0.5ms is the second sub-time period.
  • the terminal device can send to the first satellite: the first part of data is from T0-4ms to T0
  • the data corresponding to the time period between -2.5ms, and the second part of the data is sent to the second satellite.
  • the terminal device may send the first part of data to the first satellite, and send to the second satellite: data in the second part of the data corresponding to the time period between T0-2ms to T0-0.5ms.
  • the terminal device switches satellites during the transmission of uplink data, the second satellite starts receiving data from the time when the second satellite provides network services to the terminal device, and the timing advance of the second satellite is less than or equal to the timing advance of the first satellite.
  • the terminal device can transmit data according to the following method 2.
  • Method 2 The terminal device ends sending the first data to the first satellite at a time interval of a second timing advance before the start time of the time when the second satellite provides network services to the terminal device, and sends the first data to the first satellite at a time interval of the first timing advance. Send the second data to the second satellite at all times.
  • the time of satellite switching is T0. If the length of the first time period is 2ms, then the time of the second time period The length is 2ms.
  • the second timing advance amount is 2.5ms
  • the first timing advance amount is 2ms
  • the first time period is the time period between T0-4.5ms and T0-2.5ms
  • the second time period is between T0-2ms and T0 period.
  • the terminal device sends the first part of data to the first satellite
  • the terminal device sends the first part of data to the second satellite. Send the second part of data.
  • the time when the second satellite receives the data is located after the starting time of the time when the second satellite provides network services to the terminal device, and is separated by a period of time from the starting time of when the second satellite provides network services to the terminal device.
  • the communication method provided in Figure 3 may also include: the first satellite sending the second information.
  • the terminal device receives the second information.
  • the second information is used to indicate the third time period.
  • the length of the third time period is the length of the interval between the time when the first satellite stops transmitting information or the time when the terminal device's scheduled waiting period ends, and the time when the second satellite receives uplink data from the terminal device.
  • the terminal device sends data according to the time when the second satellite provides network services to the terminal device and the first timing advance, including: the terminal device sends data according to the third time period, the time when the second satellite provides network services to the terminal device and the first timing advance
  • the first uplink data is sent in advance of the timing.
  • the first uplink data may be the second part of data in the above-mentioned method 1 or 2, or scheduling information sent by the first satellite, such as uplink data scheduled by DCI, or other data that the terminal device needs to send to the second satellite. Upstream data.
  • the second information may indicate the third time period by directly indicating.
  • the second information may carry the start time and end time of the third time period.
  • the second information may indicate the third time period by indirect indication.
  • the second information may carry the length of the third time period.
  • the third time period is related to the first time and the second time
  • the second information may carry the first time and the second time.
  • the first time is the time when the first satellite stops sending scheduling information.
  • the second time is the starting time when the second satellite receives uplink data from the terminal device. In this case, after the terminal device obtains the first time and the second time, it can determine the third time period based on the first time, the second time, the first timing advance, and the second timing advance.
  • the starting time of the third time period may be the ending time of the terminal device sending the first part of data to the first satellite.
  • the length of the third time period may be the time when the first satellite ends receiving data from the terminal device and the second satellite starts receiving data from the terminal device.
  • the data is time-dependent.
  • the terminal device can send data as follows.
  • Method 3 The terminal device sends data according to the time when the second satellite provides network services to the terminal device and the first timing advance, which may include: the terminal device sends the first part of the first data to the first satellite in the first time period, The terminal device sends the second part of the first data to the second satellite in the second time period.
  • the starting time of the second time period is the time spaced by the first timing advance amount before the starting time of the third time period.
  • the third time period is In the time period between T1 and T1+2ms, the first timing advance is 0.5ms, then the time when the terminal device starts sending the second part of data to the second satellite can be T1+2ms-0.5ms, that is, T1+1.5ms.
  • the terminal device sends the second part of the first data to the second satellite in the second time period, which may include :
  • the terminal device sends the data in the second data corresponding to the third sub-time period to the second satellite in the third sub-time period. That is to say, the terminal device can discard the data in the second part of data within the third time period.
  • the second duration threshold may be 10 OFDM symbols or 10 sampling points.
  • the third method if the first timing advance amount is greater than the second timing advance amount, then the length of the third time period is greater than or equal to the first timing advance amount.
  • the third time period may be a time period used by the terminal device for downlink synchronization.
  • the terminal device can send data according to the actual duration used for downlink synchronization and the first timing advance. For details, please refer to the following methods four and five.
  • Method 4 If the terminal device can complete downlink synchronization within the time length of the third time period - the first timing advance amount, the terminal device can use the downlink synchronization time to send data to the second satellite. The following is explained in conjunction with Figure 6.
  • the terminal device can send the first part of the data to the first satellite in the first time period, and the terminal device can send the second part of the first data to the second satellite in the second time period.
  • the terminal device sends the second part of the first data to the second satellite in the second time period, which may include : The terminal device sends the data in the second data corresponding to the third sub-time period to the second satellite in the third sub-time period. That is to say, the terminal device can discard the data in the second part of data within the third time period.
  • the third duration threshold may be 10 OFDM symbols or 10 sampling points.
  • Method 5 If the downlink synchronization of the terminal device is performed after sending the first part of data to the first satellite, and the terminal device cannot complete the downlink synchronization within the length of the third time period - the length of the first timing advance, then When the first timing advance is less than the fourth duration threshold, the data in the second part of the data corresponding to the overlapping time period may be discarded, and the data in the second part of the data corresponding to the third sub-time period may be sent to the second satellite. .
  • the third sub-time period is a time period in the second time period excluding the overlapping time period. The following is explained in conjunction with Figure 7.
  • the actual length of time used by the terminal device for downlink synchronization is 1.7ms, and the first timing advance is 0.5ms. Then the second data can be discarded, which is between T2+1.7ms and T2+2.5ms. The data corresponding to the time period (corresponding to the overlapping time period), only the data corresponding to the third sub-time period in the second part of the data is sent.
  • the fourth duration threshold may be 10 OFDM symbols or 10 sampling points.
  • the third time period is the first moment when the first satellite stops sending scheduling information and the second satellite receives the data from the terminal device.
  • the length of time between the starting time of the data (the second time).
  • the scheduling information may be information used for resource scheduling, such as DCI.
  • the terminal device can transmit data as follows.
  • Method six the terminal device sends data according to the time when the second satellite provides network services to the terminal device and the first timing advance, which may include: the terminal device provides network services to the terminal device according to the third time period and the second satellite.
  • the first uplink data is sent ahead of the service time and the first timing.
  • sending the first uplink data according to the third time period, the time when the second satellite provides network services to the terminal device and the first timing advance includes: if the sending time period of the first uplink data overlaps with the third time period time period, then the data corresponding to the third sub-time period in the first uplink data is sent to the second satellite.
  • the third sub-time period is the transmission time period excluding the overlapping time period. period.
  • the sending time period is a time period during which the terminal device sends data to the second satellite.
  • the sending time period may be the second time period.
  • the time for the second satellite to receive data can be delayed, thereby avoiding overlap of data sent by the terminal device to different satellites and improving communication efficiency.
  • the terminal device provides network services to the terminal device based on the time of the second satellite and the first timing.
  • Sending data in advance may include the first device sending the first part of the data to the first satellite in the first time period, and sending the second part of the data to the second satellite in the second time period.
  • the second part of data may be sent at intervals of a first time period after the third time period.
  • the first duration the second timing advance - the first timing advance.
  • the third time period is the time period between T2 and T2+2ms
  • the first timing advance is 1ms
  • the second timing advance is 0.5ms
  • the time when the terminal equipment ends sending the first data is T2 time
  • the time when the terminal equipment starts sending the second part of data to the second satellite is T2+2.5ms.
  • the first satellite configures a scheduling waiting period for the terminal device. That is to say, after receiving the DCI, the terminal device needs to wait for a period of time to transmit data. In this case, the terminal device transmits data to the second satellite.
  • the time at which the uplink data is sent is related to the scheduling waiting period and the length of the third time period.
  • the time when the terminal device sends the uplink data to the second satellite the time when receiving DCI ends + the time length of the scheduling waiting period + the time length of the third time period.
  • the time when receiving DCI ends is T3, the length of the scheduling waiting period is 1.5ms, the length of the third time period is 1ms, the duration of the scheduled data is 2ms, and the first timing is advanced The amount is 0.5ms, then the third time period is T3+2ms to T3+4ms, and the time when the terminal device starts sending scheduled data to the second satellite is T3+2ms.
  • the communication method shown in Figure 3 may also include: the first satellite sending third information.
  • the terminal device obtains the third information.
  • the third information is used to indicate the second duration and the third duration.
  • the second duration is the waiting time for scheduling data
  • the third duration is the duration reserved for downlink synchronization.
  • the second duration is the end time of the first satellite sending the first data
  • the terminal device performs downlink within the third duration after waiting for the second duration. Synchronize.
  • the terminal device may refer to any one of the above-mentioned methods four or six for the implementation of sending uplink data.
  • the terminal device performs downlink synchronization within the second duration.
  • the timing advance can be performed at the end time of the second duration to send data to the second satellite.
  • the data respectively sent by the first satellite and the second satellite may be coordinated by a network device or a satellite having part or all of the functions of the network device.
  • the frame numbers of the data transmitted by the first satellite and the data transmitted by the second satellite are consecutive.
  • the implementation principle of S303 refers to the implementation principle of any one of the above-mentioned methods four to six, and will not be described again here.
  • the terminal device can transmit data according to the first timing advance, thereby reducing signaling overhead and transmission delay.
  • the method shown in Figure 3 may also include: the first satellite transmits fourth information.
  • the terminal device receives the fourth information.
  • the fourth information is used to indicate the starting time for the terminal device to perform downlink synchronization.
  • the fourth information may indicate the starting moment of downlink synchronization by indicating the number of repetitions of the terminal device sending uplink data. For example, if the fourth information indicates that the uplink data sent by the terminal device is repeated for the fourth time, the terminal device can perform downlink synchronization after sending the data repeatedly for the fourth time.
  • the fourth information may indicate the number of subframes following the fourth information to indicate the starting time of downlink synchronization. For example, if the number of subframes indicated by the fourth information is 3, then after receiving the fourth information, the terminal device will perform downlink synchronization after 3 subframes.
  • the terminal equipment needs to use the new PCI to scramble the upstream data.
  • FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1000 includes: a processing module 1001 and a transceiver module 1002.
  • FIG. 10 shows only the main components of the communication device.
  • the communication device 1000 may be adapted to the communication system shown in FIG. 2 to perform the functions of the terminal device in the communication method shown in FIG. 3 .
  • the communication device 1000 is used to receive the first information from the first satellite.
  • the first information is used to indicate the ephemeris information of the second satellite.
  • the processing module 1001 is configured to determine a first timing advance according to the location of the communication device 1000 and the first information.
  • the first timing advance amount is used to indicate the length of time advanced by which the transmission delay of data sent by the communication device 1000 to the second satellite is eliminated.
  • the first satellite is a satellite that currently provides network services to the communication device 1000
  • the second satellite is a satellite that the communication device 1000 is about to switch to.
  • the first timing advance includes the timing advance TA of the service link of the second satellite.
  • the first timing advance includes the TA of the service link of the second satellite and the TA of the feeder link.
  • the TA of the service link of the second satellite is used to indicate: cancel the data sent by the communication device 1000 to the second satellite.
  • the length of time advanced by the transmission delay on the service link of the second satellite, and the TA of the feeder link is used to indicate: eliminate the data sent by the communication device 1000 to the second satellite on the feeder link of the second satellite.
  • the length of time advanced by the transmission delay is used to indicate: cancel the data sent by the communication device 1000 to the second satellite.
  • the first information is also used to indicate the TA of the feeder link of the second satellite.
  • the first information is also used to indicate the time when the second satellite provides network services to the communication device 1000
  • the communication device 1000 is also used to indicate the time when the second satellite provides network services to the communication device 1000 and the first time. Data is transmitted in advance of the timing.
  • the communication device 1000 is specifically configured to obtain the second timing advance of the first satellite.
  • the overlapping time period of the first time period and the second time period is determined based on the second timing advance, the time when the second satellite provides network services to the communication device 1000, and the first timing advance.
  • the first time period is a time period for sending the first part of the first data to the first satellite
  • the second time period is a time period for sending the second part of the first data to the second satellite.
  • the communication device 1000 sends the data in the first part of the data corresponding to the first sub-time period to the first satellite, and sends the second part of the data to the second satellite;
  • a sub-time end is a time period in the first time period excluding the overlapping time period.
  • the communication device 1000 sends the first part of the data to the first satellite, and sends the data of the second part of the data corresponding to the second sub-time period to the second satellite.
  • the second sub-time period is a time period in the second time period excluding the overlapping time period.
  • the second timing advance amount is used to indicate a length of time in advance to eliminate the transmission delay of data sent by the communication device 1000 to the first satellite.
  • the communication device 1000 is further configured to receive second information from the first satellite.
  • the second information is used to indicate the third time period, and the length of the third time period is: the time when the first satellite stops transmitting information or the time when the communication device 1000 receives the communication from the second satellite at the end of the scheduling waiting period.
  • the communication device 1000 is specifically configured to send the first uplink data according to the third time period, the time when the second satellite provides network services to the communication device 1000 and the first timing advance. Wherein, the time length between the time when the communication device 1000 starts sending the fifth data to the second satellite and the second time is less than or equal to the first timing advance.
  • the communication device 1000 is specifically configured to: when there is an overlapping time period between the sending time period of the first uplink data and the third time period, sending the first uplink data to the second satellite in the same time period as the third sub-time.
  • the third sub-time period is the time period in the sending time period except the overlapping time period.
  • the communication device 1000 is also used to receive third information from the first satellite.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the communication device 1000 and the second satellite. If the second duration is less than the third duration, the communication device 1000 performs downlink synchronization with the second satellite within the third duration after waiting for the second duration.
  • the communication device 1000 is also used to receive third information from the first satellite.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the communication device 1000 and the second satellite. If the second duration is greater than or equal to the third duration, the communication device 1000 performs downlink synchronization with the second satellite within the second duration.
  • the communication device 1000 is also used to receive synchronization signals and broadcast channel blocks SSB from the second satellite.
  • the SSB is used to indicate the physical cell identity PCI of the second satellite.
  • the processing module 1001 is also used to obtain the PCI of the second satellite according to the SSB of the second satellite.
  • the first information can also be used to indicate the PCI of the second satellite.
  • the first information includes dedicated signaling of the communication device 1000, and the time when the second satellite provides network services to the communication device 1000 can be carried in one or more of the following: RRC signaling, MAC CE, or DCI.
  • the time for the communication device 1000 to perform downlink synchronization is carried in one or more of the following: RRC signaling, MAC CE, or DCI.
  • the communication device 1000 may be adapted to the communication system shown in FIG. 2 to perform the function of the first satellite in the communication method shown in FIG. 3 .
  • the processing module 1001 is used to determine the first information.
  • the communication device 1000 is used to send first information to the terminal device.
  • the first information is used to indicate the ephemeris information of the second satellite.
  • the communication device 1000 is a satellite that currently provides network services to the terminal device, and the second satellite is a satellite that the terminal device is about to switch to.
  • the communication device 1000 is also used to send the second information to the terminal device.
  • the second information is used to indicate the third time period, and the length of the third time period is: the time when the communication device 1000 transmits information or the time when the terminal equipment's scheduling waiting period ends and the second satellite receives the uplink signal from the terminal equipment. The length of time between the starting moments of the data.
  • the first information can also be used to indicate the PCI of the second satellite.
  • the communication device 1000 is also used to send third information to the terminal device.
  • the third information is used to indicate a second time period for scheduling data to wait, and a third time period reserved for downlink synchronization between the terminal device and the second satellite.
  • the transceiver module 1002 may include a receiving module and a sending module. Among them, the transceiver module 1002 is used to implement the sending function and receiving function of the communication device 1000.
  • the communication device 1000 may also include a storage module (not shown in FIG. 10), which stores programs or instructions.
  • the processing module 1001 executes the program or instruction, the communication device 1000 can perform the function of the first satellite in the communication method shown in FIG. 3 .
  • the processing module 1001 involved in the communication device 1000 can be implemented by a processor or a processor-related circuit component, and can be a processor or a processing unit;
  • the transceiver module 1002 can be implemented by a transceiver or a transceiver-related circuit component, and can be a transceiver. transmitter or transceiver unit.
  • the communication device 1000 may be the first satellite shown in FIG. 2 , or may be a chip (system) or other component or component provided in the above-mentioned satellite, or a device including the first satellite.
  • the embodiment of the present application does not apply to this. Make limitations.
  • FIG. 11 is a second structural schematic diagram of a communication device provided by an embodiment of the present application.
  • the communication device may be a terminal device or a network device, or may be a chip (system) or other component or component that can be disposed on the terminal device or the network device.
  • the communication device 1100 may include a processor 1101 .
  • the communication device 1100 may also include a memory 1102 and/or a transceiver 1103.
  • the processor 1101 is coupled to the memory 1102 and the transceiver 1103, for example, through a communication bus.
  • the processor 1101 is the control center of the communication device 1100, and may be a processor or a collective name for multiple processing elements.
  • the processor 1101 is one or more central processing units (CPUs), may also be an application specific integrated circuit (ASIC), or may be configured to implement one or more embodiments of the present application.
  • An integrated circuit such as one or more digital signal processors (DSP), or one or more field programmable gate arrays (FPGA).
  • DSP digital signal processors
  • FPGA field programmable gate arrays
  • the processor 1101 can perform various functions of the communication device 1100 by running or executing software programs stored in the memory 1102 and calling data stored in the memory 1102.
  • the processor 1101 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 11 .
  • the communication device 1100 may also include multiple processors, such as the processor 1101 and the processor 1104 shown in FIG. 11 .
  • processors can be a single-core processor (single-CPU) or a multi-core processor (multi-CPU).
  • a processor here may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).
  • the memory 1102 is used to store the software program for executing the solution of the present application, and is controlled by the processor 1101 for execution.
  • the memory 1102 is used to store the software program for executing the solution of the present application, and is controlled by the processor 1101 for execution.
  • the memory 1102 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory (RAM)) or a random access memory (RAM) that can store information and instructions.
  • ROM read-only memory
  • RAM random access memory
  • RAM random access memory
  • RAM random access memory
  • RAM random access memory
  • Other types of dynamic storage devices for instructions can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical discs Storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and any other media capable of being accessed by a computer, without limitation.
  • the memory 1102 may be integrated with the processor 1101, or may exist independently, and be coupled with the processor 1101 through the interface circuit of the communication device 1
  • the communication device 1100 is a terminal device, and the transceiver 1103 can be used to communicate with a network device or with another terminal device.
  • the communication device 1100 is a network device, and the transceiver 1103 can be used to communicate with a terminal device or with another network device.
  • the transceiver 1103 may include a receiver and a transmitter (not shown separately in Figure 11). Among them, the receiver is used to implement the receiving function, and the transmitter is used to implement the sending function.
  • the transceiver 1103 can be integrated with the processor 1101, or can exist independently and be coupled to the processor 1101 through the interface circuit (not shown in Figure 11) of the communication device 1100. This is not the case in the embodiment of this application. Specific limitations.
  • the structure of the communication device 1100 shown in FIG. 11 does not constitute a limitation on the communication device.
  • the actual communication device may include more or less components than shown in the figure, or combine certain components, or arrange different components.
  • the technical effects of the communication device 1100 can be referred to the technical effects of the communication method described in the above method embodiments, which will not be described again here.
  • the processor in the embodiment of the present application can be a central processing unit (CPU).
  • the processor can also be other general-purpose processors, digital signal processors (DSP), special-purpose integrated processors, etc.
  • Circuit application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • non-volatile memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase electrically programmable read-only memory (EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • RAM synchronous dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • double data rate SDRAM double data rate SDRAM
  • DDR SDRAM double data rate SDRAM
  • enhanced SDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous connection dynamic random access memory access memory
  • direct rambus RAM direct rambus RAM, DR RAM
  • the above embodiments may be implemented in whole or in part by software, hardware (such as circuits), firmware, or any other combination.
  • the above-described embodiments may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • 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 or transmitted from one computer-readable storage medium to another, e.g., the computer instructions may be transferred from a website, computer, server, or data center Transmit to another website, computer, server or data center through wired (such as infrared, wireless, microwave, etc.) means.
  • the computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server or a data center that contains one or more sets of available media.
  • the usable media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media.
  • the semiconductor medium may be a solid state drive.
  • At least one refers to one or more, and “plurality” refers to two or more.
  • At least one of the following” or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items).
  • at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple .
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code. .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

La présente demande concerne un procédé et un appareil de communication, qui peuvent réduire le surdébit de signalisation et le retard de transmission et peuvent être appliqués à un système de communication. Le procédé comprend les étapes suivantes : un dispositif terminal reçoit des premières informations en provenance d'un premier satellite et détermine une première avance temporelle en fonction de l'emplacement du dispositif terminal et des premières informations. Les premières informations sont utilisées pour indiquer des informations d'éphémérides d'un second satellite. La première avance temporelle est utilisée pour indiquer : la durée avancée pour éliminer le retard de transmission de données envoyées par le dispositif terminal au second satellite.
PCT/CN2023/080871 2022-08-10 2023-03-10 Procédé et appareil de communication WO2024031981A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109819511A (zh) * 2017-11-22 2019-05-28 华为技术有限公司 一种数据传输的方法及相关装置
CN112399548A (zh) * 2019-08-14 2021-02-23 华为技术有限公司 一种确定定时提前的方法以及相关设备
US20220132447A1 (en) * 2020-10-23 2022-04-28 Centre Of Excellence In Wireless Technology Methods and systems for uplink time synchronization in non-terrestrial networks based communication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109819511A (zh) * 2017-11-22 2019-05-28 华为技术有限公司 一种数据传输的方法及相关装置
CN112399548A (zh) * 2019-08-14 2021-02-23 华为技术有限公司 一种确定定时提前的方法以及相关设备
US20220132447A1 (en) * 2020-10-23 2022-04-28 Centre Of Excellence In Wireless Technology Methods and systems for uplink time synchronization in non-terrestrial networks based communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CONVIDA WIRELESS: "On Power Savings Using PDCCH Skipping", 3GPP DRAFT; R1-1911007_ON_POWER_SAVINGS_USING_PDCCH_SKIPPING, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Chongqing, China; 20191014 - 20191020, 5 October 2019 (2019-10-05), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051808783 *

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