CN114615717B - Non-ground network communication method, communication device and storage medium - Google Patents

Non-ground network communication method, communication device and storage medium Download PDF

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Publication number
CN114615717B
CN114615717B CN202210511755.2A CN202210511755A CN114615717B CN 114615717 B CN114615717 B CN 114615717B CN 202210511755 A CN202210511755 A CN 202210511755A CN 114615717 B CN114615717 B CN 114615717B
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satellite
terminal
target satellite
time
current target
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CN114615717A (en
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唐懿夫
周楠清
魏波
任广梅
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Chengdu Airui Wireless Technology Co ltd
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Chengdu Airui Wireless Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a non-ground network communication method, a communication device and a storage medium, wherein the method comprises the following steps: the method comprises the steps that a source satellite which is in communication connection with a terminal at present generates satellite switching information and sends the satellite switching information to the terminal, the terminal determines the respective reset earliest arrival time and reset latest arrival time of at least one target satellite again based on the received satellite switching information, the geographic position of the terminal and mobile parameters, and the terminal executes satellite switching operation according to the respective reset earliest arrival time and reset latest arrival time of the at least one target satellite, so that meaningless signal monitoring after the terminal wakes up can be avoided, and the power consumption of the terminal is saved.

Description

Non-ground network communication method, communication device and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a Non Terrestrial Network (NTN) communication method, a communication apparatus, and a storage medium.
Background
In New Radio (NR) systems, NTN is introduced. In the NTN, a base station or a part of the base station functions are deployed on a high-altitude platform or a satellite to provide seamless coverage for a terminal. As the satellites move around the earth, the terminals are also moving relative to the earth, which results in that a terminal that is using network services may move from the coverage of one satellite to the coverage of another. In order to ensure the continuity of communication and the quality of service, the terminal needs to perform cell handover or cell reselection.
Fig. 1 illustrates a wireless communication system including a terrestrial communication network NW1 and a non-terrestrial communication network NW2, of conventional art. All terrestrial base stations (eNB and gNB) and satellite base stations constitute a cell. In the non-terrestrial network NW2, one Satellite base Station (Satellite Station) may be any Satellite including a Low Earth Orbit (LEO) Satellite, a Medium Earth Orbit (MEO) Satellite, a Geostationary Earth Orbit (GEO) Satellite, and a High Elliptic Orbit (HEO) Satellite. A satellite base station may be a device mounted on any of the above satellites. A satellite base station may also be a space vehicle. A satellite base station may also be a device onboard a spacecraft.
A cell, also known as a cell, refers to an area where a base station can provide communication coverage. The cell of fig. 1 may include a Macro base station (Macro cell), a Micro base station (Micro cell), a Small base station (Small cell), a home base station (Femto cell), a Pico base station (Pico cell), and the like.
The terrestrial communication network NW1 is connected to a core network CN. If the radio access technology provided by the terrestrial communication network NW1 is 4G, the core network CN is an EPC. If the radio access technology provided by the terrestrial communication network NW1 is 5G, the core network CN is 5 GC. The core Network includes a gateway (gateway) and a gateway switch (gateway switch), and is connected to a Public Network (PN) through a gateway device. The public network refers to: such as the Internet (Internet), a local area Network (local Network), or a telephone Network (including mobile and fixed telephone networks). The terminal can be accessed to a ground communication network to communicate with a ground base station (eNB/gNB), and can also be accessed to a non-ground network to communicate with a non-ground base station (aircraft, satellite, airborne equipment, satellite-borne equipment, etc.).
Fig. 2 shows a wireless communication system of a non-terrestrial network in the conventional art. Satellite base stations are mainly geostationary satellites (GEO) and low earth satellites (LEO). The geostationary satellite is located in an orbit at an orbital height of about 35786km and moves at the same speed as the earth's own velocity. Geosynchronous satellites may be considered stationary with respect to users on the ground. The orbit height of the near-earth satellite is lower than that of a geostationary satellite or a medium-orbit satellite, and the orbit height is 500 km-2000 km. Unlike geostationary satellites, the earth-proximal satellites are mobile relative to ground terminals.
Since only the geosynchronous satellites at a fixed orbital height can maintain the same rotation speed as the earth, more satellites in the near field are required to provide communication coverage for the terminals on the ground in order to meet the requirement of communication coverage. It can therefore be said that in a non-terrestrial communications network, most terminals need to communicate with a low earth satellite most of the time. In other words, the satellite base stations serving these terminals have mobility with respect to the terminals. Therefore, in contrast to the scenario of terrestrial network communication, in a non-terrestrial communication network, even if the terminal does not move, but the satellite communicating with the terminal moves, the terminal needs to switch the satellite. During the satellite switching process, similar to the ground network communication, signaling interaction is also required between the terminal and the satellite.
In addition, terminals on the ground may be stationary or mobile. For a stationary terminal, the terminal can be a device fixed on the ground or a terminal; for a mobile terminal, it may be a vehicle-mounted or portable device or terminal. Moreover, the Category of the terminal may be various, for example, different categories (Category) of terminals defined in the 3GPP standard, or some devices with limited capability (reccap), such as devices sensitive to power consumption, such as IoT (internet of things), etc. By power consumption sensitive it is meant that some small device terminals, for example sensitive to the power consumption of a battery, i.e. such terminals need to save as much power as possible during communication. As mentioned previously, frequent signaling interactions due to base station handover caused by satellite base station movement during non-terrestrial network communications are also a challenge for power consumption sensitive IoT (internet of things) devices.
In this regard, in the existing wireless communication specifications, there have been various techniques for reducing unnecessary power consumption of users in communication. Such as Discontinuous Reception (DRX), extended Discontinuous Reception (eDRX), etc. The terminal needs to perform handover of the satellite base station frequently due to movement of the satellite. Currently, for the NTN system, the number of deployed satellites cannot guarantee that the terminal can continuously enjoy the communication coverage of the satellites. For devices that need to save power consumption (e.g., IoT devices), when they are not covered by a satellite, they may enter a sleep period of DRX or psm (power Saving mode) state to save power consumption. The current satellite serving the terminal may provide some assistance information (e.g., ephemeris information, including orbit information, motion parameters, etc.) for satellite handover, so that the terminal ends DRX sleep or PSM when the next satellite arrives and starts communicating with the next satellite.
In a common technique, although a source satellite (denoted as Sat _ a) that has currently established a communication connection with a terminal may provide information to the terminal (e.g., IoT device) in order to calculate the arrival time of the next satellite (denoted as Sat _ B) that can provide a communication service for the terminal or directly provide the arrival time of Sat _ B. However, whether the time is calculated by Sat _ a or the time is calculated by the terminal, there may be an error in the accuracy of the calculation. In addition, when the terminal has mobility, or depending on factors such as complex terrain of the geographical environment where the terminal is located, there may be an error in estimating the arrival time of Sat _ B. This error will result in: the terminal wakes up before Sat _ B arrives or the terminal wakes up after Sat _ B departs. Both of the above situations will cause the terminal to waste a period of time listening to the downlink signal, thereby increasing the power consumption of the terminal.
Therefore, it is desirable to provide a new non-terrestrial network communication method to reduce the terminal's meaningless downlink signal interception to the satellite.
Disclosure of Invention
In view of the above drawbacks of the prior art, the present invention provides a non-terrestrial network communication method, a communication apparatus, and a storage medium, so as to reduce the terminal from monitoring a satellite for meaningless downlink signals.
In order to achieve the above object, the present invention provides a non-terrestrial network communication method, including: a source satellite which is in communication connection with a terminal at present generates satellite switching information and sends the satellite switching information to the terminal, wherein the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of at least one target satellite; the terminal determines the re-determined earliest and latest arrival time of each target satellite based on the received satellite switching information, the geographic position of the terminal and the movement parameter; and the terminal executes satellite switching operation according to the respective reset earliest arrival time and reset latest arrival time of the at least one target satellite.
According to another aspect of the present invention, there is also provided a non-terrestrial network communication method applied to a satellite, the method including: under the condition that communication connection is established with a terminal, the satellite generates satellite switching information according to the communication service coverage and the motion parameters of the satellite and the geographic position and the motion parameters of the terminal; sending the satellite switching information to the terminal to trigger the terminal to execute satellite switching operation based on the satellite switching information; the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of each target satellite.
According to another aspect of the present invention, the present invention further provides a non-terrestrial network communication method applied to a terminal, the method including: receiving satellite switching information from a source satellite, wherein the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of at least one target satellite; re-determining the respective re-determined earliest and latest arrival time of the at least one target satellite according to the satellite switching information, the geographic position of the target satellite and the movement parameter; performing a satellite handoff operation based on the respective reset earliest and latest arrival times of the at least one target satellite.
According to another aspect of the present invention, there is also provided a communication apparatus for use with a satellite of a non-terrestrial network, the apparatus comprising: the generating unit is used for generating satellite switching information according to the communication service coverage and the motion parameters of the satellite and the geographic position and the motion parameters of the terminal under the condition that the communication connection is established with the terminal; a sending unit, configured to send the satellite switching information to the terminal, so as to trigger the terminal to perform a satellite switching operation based on the satellite switching information; the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of each target satellite.
According to another aspect of the present invention, there is also provided a communication apparatus for a terminal of a non-terrestrial network, the apparatus including: a receiving unit, configured to receive satellite handover information from a source satellite, where the satellite handover information includes an earliest arrival time, a latest arrival time, and a maximum listening threshold of at least one target satellite; a re-determining unit, configured to re-determine a re-determined earliest and a re-determined latest arrival time of each of the at least one target satellite according to the satellite switching information, the geographic location of the target satellite, and the movement parameter; a switching unit for performing a satellite switching operation based on the respective re-determined earliest and latest arrival times of the at least one target satellite.
Further, the present invention also provides a computer-readable storage medium, in which a computer program is stored, and the computer program is executed by a processor to implement any of the above-mentioned non-terrestrial network communication methods.
The invention provides a non-ground network communication method, a communication device and a storage medium, aiming at re-determining the earliest arrival time and the latest arrival time of the next target satellite through a terminal so as to solve the problem that when the arrival time of the target satellite is later than the awakening time of the terminal, the terminal avoids meaningless signal monitoring after awakening and saves the power consumption of the terminal.
Furthermore, the terminal can also sleep and wake up for a plurality of times after waking up until the latest arrival time of the current target satellite according to the reset of the terminal so as to try to carry out communication connection with the current target satellite, and the power consumption of the terminal can be saved in the period.
Furthermore, the terminal can adjust the sleep time and the sleep and wake-up times of the terminal, so that the power consumption is saved, and the success rate of the current target satellite detection is improved.
Drawings
The technical scheme and other beneficial effects of the invention are obvious from the detailed description of the specific embodiments of the invention in combination with the attached drawings.
Fig. 1 illustrates a wireless communication system including a terrestrial communication network NW1 and a non-terrestrial communication network NW2, which is one of the conventional technologies.
Fig. 2 illustrates a wireless communication system of a non-terrestrial network in the prior art.
Fig. 3 is a flowchart illustrating a non-terrestrial network communication method according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating an operation of a non-terrestrial network communication method according to an embodiment of the present invention.
Fig. 5 is a schematic view illustrating a scenario that a terminal listens to a target satellite after waking up according to an embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating a scenario that a terminal listens to a target satellite after waking up according to yet another embodiment of the present invention.
Fig. 7 is a flowchart illustrating an operation of a non-terrestrial network communication method according to another embodiment of the present invention.
Fig. 8 is a block diagram illustrating a communication apparatus applied to a satellite of a non-terrestrial network according to an embodiment of the present invention.
Fig. 9 is a block diagram illustrating a communication apparatus applied to a terminal of a non-terrestrial network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. In the description of the present invention, "a plurality" means two or more unless explicitly defined otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware circuits or integrated circuits, or in different networks and/or processor means and/or micro-indicator means.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The present invention will be described in further detail with reference to the accompanying drawings and detailed description, in order to make the objects, features and advantages thereof more comprehensible.
Fig. 3 is a flowchart illustrating a non-terrestrial network communication method according to an embodiment of the present invention.
Referring to fig. 3, a non-terrestrial network communication method provided in an embodiment of the present invention includes the following steps:
step S10, a source satellite which has established communication connection with a terminal generates satellite switching information and sends the satellite switching information to the terminal, wherein the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of at least one target satellite;
step S20, the terminal re-determining the respective re-determined earliest and latest arrival time of the at least one target satellite based on the received satellite switching information and the geographic position and movement parameters of the terminal;
and step S30, the terminal performs a satellite switching operation according to the respective reset earliest and latest arrival time of the at least one target satellite.
The steps S10 to S30 will be specifically described below.
In step S10, the source satellite currently establishing a communication connection with the terminal determines, by its coverage and motion parameters, and the geographic location and motion parameters of the terminal, that the communication service cannot be provided to the terminal after time T0, for example, during the communication with the terminal. Therefore, the source satellite, which has currently established a communication connection with the terminal, generates satellite switching information and transmits the satellite switching information to the terminal. In order to ensure that the terminal successfully receives the satellite switching information, in one case, the source satellite can ensure that the terminal has enough time to receive and feed back the satellite switching information by setting T0. For example, if the terminal successfully receives the satellite switching information and feeds back ACK, the source satellite considers that the terminal has successfully received the satellite switching information. Otherwise, if the terminal fails to decode the satellite switching information after receiving the satellite switching information, and feeds back NACK; or the terminal loses the satellite switching information and further does not send any feedback information, and the source satellite needs to resend the satellite switching information. Therefore, in the case where it is necessary to confirm that the terminal successfully receives the satellite switching information, T0 needs to include the total time of initial transmission, retransmission, and terminal feedback of the switching information. When the source satellite does not need any feedback to the satellite switching information from the terminal, the source satellite can send the satellite switching information at least once to ensure that the terminal successfully receives the satellite switching information. Also, the contents of the at least one satellite switching message may be identical.
The satellite switching information at least comprises the following contents: the earliest time of arrival, the latest time of arrival, and the maximum listening threshold for each of the at least one target satellite. Specifically, the at least one target satellite is a satellite which arrives in sequence after the source satellite leaves and can provide communication service for the terminal. A terminal is not a target satellite if the first satellite to arrive after the source satellite leaves is not able to provide communication services to the terminal or the terminal does not need a satellite to provide communication services to the terminal.
The earliest and latest arrival times of the at least one target satellite may be calculated from ephemeris information of the satellites and geographic position and motion information of the user. For example, for satellites of the same satellite vendor, the source satellite may acquire ephemeris information of other satellites and information of the earliest time of arrival T1 and the latest time of arrival T2 of the next target satellite by pre-configuration at the initial stage of the networking. If inter-Satellite networking is already in progress in the NTN communication system, i.e., if S2S (Satellite-to-Satellite) communication is possible between satellites over the Satellite communication link, the source Satellite may request ephemeris information from the target Satellite. Or the target satellite broadcasts its own ephemeris information to other satellites. If the NTN system does not carry out inter-planet networking, namely a satellite communication link does not exist between the satellites for S2S communication, ephemeris information is interacted between the source satellite and the target satellite through a ground communication network.
Further, the maximum listening threshold includes a maximum listening time and/or a maximum number of listening times. The maximum monitoring time represents the longest continuous monitoring time required after the terminal starts monitoring the downlink information of the target satellite. The maximum monitoring times represent the maximum monitoring times required after the terminal starts monitoring the downlink information of the target satellite. Optionally, in some embodiments of the present invention, the maximum listening time and the maximum listening number may also be included at the same time, which indicates that the maximum listening number is obtained in the maximum listening time interval after the terminal starts listening to the downlink information of the target satellite.
For example, a source satellite may provide the arrival times of multiple target satellites. For example, the source satellite Sat _ a provides the earliest and latest arrival times of the next fastest arriving target satellite Sat _ B, as well as the maximum listening threshold for Sat _ B. At the same time, the source satellite Sat _ a also provides the earliest and latest arrival times of the fastest arriving target satellite Sat _ C, later than Sat _ B, and a maximum listening threshold for Sat _ C. Alternatively, the maximum listening threshold for Sat _ B and the maximum listening threshold for Sat _ C may be different, for example, the maximum listening time for Sat _ B and the maximum listening time for Sat _ C are different, or the maximum listening number for Sat _ B and the maximum listening number for Sat _ C are different.
In step S20, after the terminal successfully receives the satellite switching information, the terminal re-determines the earliest arrival time T3 and the latest arrival time T4 of the target satellite according to the satellite switching information, the geographic location of the terminal and the movement parameters of the terminal. That is, the T1 may be different from T3, and the T2 may be different from T4.
In step S30, the terminal performs a satellite switching operation according to the respective redirected earliest and latest arrival times of the at least one target satellite. Therefore, the situation that the terminal searches possible suitable cells all the time in the satellite switching process to carry out meaningless monitoring work, so that the terminal cannot work efficiently and energy is saved due to the fact that the estimation of the earliest arrival time T1 and the latest arrival time T2 of the next target satellite is inaccurate can be avoided. And the terminal may set a sleep time, for example, enter a sleep mode from a time T5 and set a wake-up time counter Tc according to the earliest arrival time of the next target satellite to be reset, and satisfy T3 ≦ Tc ≦ T4. In the sleep mode, the terminal may switch to an RRC (Radio Resource Control) inactive state, or enter a DRX sleep state, or enter a PSM state, for example, and the wake-up time counter Tc may be determined according to its own parameters. For example, according to the electric quantity of the user, the sensitivity to the power consumption, the communication service requirement of the user and the like, the energy can be saved to the greatest extent.
For example, when the power of the terminal itself is low, it may be necessary to ensure that the terminal can monitor the target satellite after waking up for the first time as much as possible. Therefore, the wakeup at the time close to the time of T3 and T4 can be avoided, so that premature wakeup or late wakeup due to estimation errors of the terminal can be prevented, and long-time meaningless downlink listening can be avoided. Illustratively, the terminal may set the sleep time Tc = (T4+ T3)/2.
Illustratively, depending on the communication service of the terminal itself, e.g., the need to communicate with the target satellite as soon as possible, the terminal may attempt to wake up at time T3 (the earliest arrival time of the next target satellite being relocated), even earlier than time T3, to enable communication to begin as soon as the next target satellite can provide communication service to itself.
The non-ground network communication method provided by the embodiment of the invention aims to determine the earliest arrival time and the latest arrival time of the next target satellite through the terminal again so as to solve the problem that when the arrival time of the target satellite is later than the awakening time of the terminal, the terminal avoids meaningless signal monitoring after awakening and saves the power consumption of the terminal.
Specifically, the terminal performing a satellite handoff operation based on the respective reset earliest and latest arrival times of the at least one target satellite comprises: according to the arrival sequence, the terminal sequentially carries out the following switching operation aiming at each target satellite:
(1) determining an earliest arriving target satellite of the at least one target satellite as a current target satellite;
(2) determining the current sleep time corresponding to the current target satellite based on the current working state of the terminal;
(3) entering a sleep mode within the current sleep time corresponding to the current target satellite, and starting to monitor a signal sent by the current target satellite within a maximum monitoring threshold corresponding to the current target satellite after the sleep mode is finished so as to try to establish communication connection with the current target satellite;
(4) if the communication connection with the current target satellite is successfully established, terminating the switching operation;
(5) if the communication connection with the current target satellite fails and the total attempt time or the total number of attempts is not greater than a preset threshold value, returning to the step (2), if the communication connection with the current target satellite fails and the total attempt time or the total number of attempts is greater than the preset threshold value, entering the step (6), wherein the total attempt time is set according to the latest arrival time of the current target satellite provided by the source satellite or the latest arrival time of the current target satellite reset by the terminal, and the total number of attempts is set according to the latest arrival time of the current target satellite provided by the source satellite or the latest arrival time of the current target satellite reset by the terminal;
(6) and taking the next earliest arriving target satellite after the current target satellite passes through as a new current target satellite.
For each current target satellite, the ending time of each current sleep time corresponding to the current target satellite is after the reset earliest arrival time corresponding to the target satellite and before the reset latest arrival time corresponding to the target satellite.
Optionally, in a case that the maximum listening threshold only includes a maximum listening time, the step (3) includes: and if the signal sent by the current target satellite cannot be successfully monitored within the maximum monitoring time, determining that the communication connection with the current target satellite fails to be established.
Optionally, in a case that the maximum listening threshold only includes a maximum number of listening times, the step (3) includes: and if the signal transmitted by the current target satellite cannot be successfully monitored within the maximum monitoring times, determining that the communication connection with the current target satellite fails to be established.
Optionally, in a case that the maximum listening threshold includes a maximum listening time and a maximum listening number, the step (3) includes: and if the signal sent by the current target satellite cannot be successfully monitored under the condition that the number of monitoring times within the maximum monitoring time reaches the maximum monitoring number, determining that the communication connection with the current target satellite fails to be established.
And after the terminal has elapsed the sleep time, the terminal starts to monitor the downlink channel again. If the terminal monitors the downlink signal of the current target satellite in the maximum monitoring time interval; or monitoring the downlink signal of the current target satellite after monitoring less than the maximum monitoring times; or monitoring the downlink signal of the current target satellite after monitoring less than the maximum monitoring times in the maximum monitoring time interval, and accessing the terminal to the current target satellite for communication.
Example one
Fig. 4 is a schematic view illustrating an operation flow of a non-terrestrial network communication method according to an embodiment of the present invention, and fig. 5 is a schematic view illustrating a scenario that a terminal listens to a target satellite after waking up according to an embodiment of the present invention.
As shown in fig. 4 and 5, a source satellite currently having established a communication connection with a terminal generates satellite switching information and transmits the satellite switching information to the terminal, where the satellite switching information includes an earliest arrival time, a latest arrival time, and a maximum monitoring threshold of at least one target satellite; the terminal re-determines respective re-determined earliest and latest arrival times of the at least one target satellite based on the received satellite switching information and the geographical position and movement parameters of the terminal.
And after the terminal finishes the communication with the source satellite, setting a sleep time Tc, and entering the sleep at a time T5. After estimating the earliest time T3 and the latest arrival time T4 of the current target satellite, the terminal wakes up at the time T5+ Tc and monitors the downlink signal of the target satellite at the time T6. And the actual listening time interval T6- (T5 + Tc) is smaller than the maximum listening time interval P in the satellite switching information, or the number of actual listening times performed within the actual listening time interval T6- (T5 + Tc) is smaller than the maximum listening time K in the satellite switching information. And if the terminal detects the downlink signal of the current target satellite within the maximum monitoring time interval, the terminal executes satellite switching operation to realize the establishment of communication connection with the current target satellite. On the contrary, if the terminal does not monitor the downlink signal of the current target satellite in the maximum monitoring time interval, or does not monitor the downlink signal of the current target satellite after monitoring the maximum monitoring times, for example, the terminal may wake up too early, so that the terminal still cannot establish a communication connection with the current target satellite in the maximum monitoring time interval or after the maximum monitoring times. In order to save power consumption, the terminal may be put into the sleep mode again.
Compared with the common technology, the terminal can continuously detect the downlink signal of the target satellite after waking up, the embodiment of the invention can carry out dormancy and waking up for many times within the time from the first waking up of the terminal to the latest arrival time of the current target satellite reset according to the terminal so as to try to carry out communication connection with the current target satellite, and the power consumption of the terminal can be saved in the period.
Fig. 6 is a schematic diagram illustrating a scenario that a terminal listens to a target satellite after waking up according to yet another embodiment of the present invention.
As shown in fig. 6, the sleep time Ts for the terminal to enter the sleep mode again for the same current target satellite may be determined according to the earliest arrival time T3 and the latest arrival time T4 of the current target satellite re-determined by the terminal and parameters of the terminal itself (e.g., remaining power, sensitivity to power consumption, traffic type, etc.).
And the terminal can also adjust the self sleeping time and sleeping and awakening times so as to improve the success rate of the current target satellite detection while saving power consumption. Illustratively, first, after the terminal ends communication with the source satellite, the terminal sets a sleep time Tc and goes to sleep at time T5. The terminal wakes up for the first time at the time T5+ Tc according to the reset current target satellite after the earliest arrival time T3 and the latest arrival time T4, and finishes monitoring at the time T6, but still fails to monitor the downlink signal of the target satellite. For example, the actual listening interval T6- (T5 + Tc) has reached the maximum listening time interval P; or has listened for the maximum listening number K times (K is the maximum preset threshold) within the actual listening interval T6- (T5 + Tc). At this point, the terminal will reset a sleep time Ts and go to sleep again, and wake up again at time T6+ Ts.
If the terminal still needs to be in communication connection with the current target satellite, it needs to be guaranteed at least to wake up before the latest arrival time T4 of the current target satellite being relocated. For example, when the power of the terminal itself is low, it may be necessary to ensure that the current target satellite can be monitored after the next wakeup as much as possible. Therefore, the awakening time near the time of T6 and T4 can be avoided, so that the early awakening or the late awakening due to estimation errors is prevented, and long-time meaningless downlink monitoring is avoided. Illustratively, the terminal may set the sleep time Tc = (T6+ T3)/2.
In addition, the terminal also needs to communicate with the current target satellite as soon as possible according to the communication service type of the terminal itself, for example, so the terminal can set a short sleep time Ts so as to start communication just before the current target satellite can provide communication service for the terminal. For example, in an extreme case, the next sleep time Ts of the terminal may be set to 0, indicating that the terminal does not need to enter the sleep mode.
For a terminal performing DRX, the DRX cycle may be disregarded when it decides to enter the sleep state again. Illustratively, the terminal may also continue to remain in sleep mode if the sleep time Ts is within the duration of DRX, for example.
Optionally, the terminal may sleep and wake up multiple times between the earliest arrival time T3 and the latest arrival time T4 of the current target satellite being relocated, and the sleep times at which the multiple times of sleep may be performed may be different. Similarly, the setting of the plurality of sleep times may be set according to the amount of power of the user, the sensitivity to power consumption, the type of communication service, and the like.
Since the terminal has undergone multiple times of hibernation and wakeup, the remaining monitoring time is reduced, and under the condition that multiple times of current hibernation time are determined for the same current target satellite, the values of the multiple times of current hibernation time are sequentially reduced.
Further, after the terminal successfully establishes the communication connection with the current target satellite, the following operations are performed: counting whether the number of times that the terminal enters the sleep mode for the current target satellite is larger than a first preset threshold or not, or whether the sleep time corresponding to the terminal entering a second sleep mode for the current target satellite is larger than a second preset threshold or not; under the condition that the times are greater than the first preset threshold value or the sleep time corresponding to the entering of the second sleep mode is greater than the second preset threshold value, under the condition, the early waking moment after the first sleep mode is finished can be determined, and the measurement information is reported to the current target satellite; the current target satellite will estimate the arrival time of the next arriving target satellite in time in conjunction with the measurement information.
The measurement information includes at least one of the following:
1) the satellite handoff information provided by the source satellite;
2) the geographic position and the motion parameters of the terminal;
3) the time when the terminal wakes up each time;
4) the time when the terminal enters the sleep mode each time;
5) a wake-up time counter set when the terminal enters a sleep mode each time;
6) the number of times the terminal enters the sleep mode;
7) the number of awakenings of the terminal.
And the current target satellite estimates the arrival time of the next arriving target satellite in time again according to the measurement information and by combining ephemeris information. If the terminal misses a communication with the current target satellite that arrives fastest at all, it will try to listen to other target satellites according to the information provided by the source satellite.
Example two
Fig. 7 is a flowchart illustrating an operation of a non-terrestrial network communication method according to another embodiment of the present invention.
As shown in fig. 7, in this embodiment, before the generating the satellite switching information and sending the satellite switching information to the terminal, the method further includes: the source satellite receives a dormancy request sent by the terminal and generates satellite switching information according to the dormancy request; the sleep request comprises a service model of the terminal, the source satellite screens at least one target satellite capable of providing communication service for the terminal according to the service model, and the terminal is instructed in the satellite switching information to switch the state of the terminal to the RRC inactive state under the condition that the time of waking up the terminal next time and the source satellite are still in the coverage range of providing communication service for the terminal, so that the communication connection is directly reestablished with the source satellite when the terminal wakes up next time.
Illustratively, the terminal sends a sleep request to the source satellite according to its own traffic information. The dormancy request includes a traffic model of the user, e.g., for IoT devices, the IoT devices are typically considered to periodically communicate with the base station, and thus the traffic period of the terminal may be reported in the dormancy request. The source satellite can judge the most suitable target satellite according to the service model of the terminal. If the terminal still enjoys the communication coverage of the source satellite at the next time communication is needed, the terminal can be switched to the RRC _ INACTIVE (RRC INACTIVE) state through the satellite switching information, the situation that the terminal searches for a cell again after waking up is avoided, and the terminal can be switched to the RRC _ CONNECTED (RRC CONNECTED) state from the RRC _ INACTIVE state for communication. At this time, the terminal also does not need to estimate the arrival time of the next target satellite. Otherwise, the same as the scheme of the first embodiment, the source satellite which has already established communication connection with the terminal sends satellite switching information to the terminal, so that the terminal enters a sleep state after successfully receiving the satellite switching information, and the terminal sets a wake-up time counter Tc according to the earliest arrival time and the latest arrival time of the current target satellite which have been re-estimated and enters a sleep mode, subsequently the terminal wakes up and starts to detect the target satellite after the wake-up time counter returns to zero, and if the terminal detects a downlink signal of the current target satellite within the maximum monitoring time interval, the terminal executes satellite switching operation to establish communication connection with the current target satellite. On the contrary, if the terminal does not monitor the downlink signal of the current target satellite in the maximum monitoring time interval, or does not monitor the downlink signal of the current target satellite after monitoring the maximum monitoring times, for example, the terminal may wake up too early, so that the terminal still cannot establish a communication connection with the current target satellite in the maximum monitoring time interval or after the maximum monitoring times. In order to save power consumption, the terminal may reset a wake-up time counter Ts and enter the sleep mode again.
The following description will exemplarily describe the technical solution of the present invention by the following examples according to the above-described procedures of introducing the non-terrestrial network communication method.
Example one
The method comprises the steps that a satellite Sat _ A which is in communication connection with a terminal at present generates satellite switching information and sends the satellite switching information to the terminal, and the terminal receives the satellite switching information sent by the Sat _ A at the moment T. The satellite switching information indicates that the earliest arrival time of the next target satellite Sat _ B is 1 minute after the T time, the latest arrival time of the next target satellite Sat _ B is 2 minutes after the T time, and the maximum monitoring time interval of the terminal is 20 ms. And the terminal estimates the arrival time of the next target satellite, and determines that the earliest arrival time of the next target satellite is 1 minute after the T time, and the latest arrival time of the next target satellite is 2 minutes after the T time, namely the terminal does not adjust the arrival time of the next target satellite indicated by the source satellite Sat _ A. I.e. the time of arrival indicated by the source satellite is not adjusted by the terminal at this time. The terminal then goes to sleep and wakes up after 1 minute of time T. And the terminal starts monitoring the next target satellite after waking up, detects the downlink signal of the next target satellite within 20ms, executes satellite switching operation, successfully accesses the next target satellite and starts communication.
Example two
The method comprises the steps that a satellite Sat _ A which is in communication connection with a terminal at present generates satellite switching information and sends the satellite switching information to the terminal, and the terminal receives the satellite switching information sent by the Sat _ A at the moment T. The satellite switching information indicates that the earliest arrival time of the next target satellite Sat _ B is 1 minute of the T time, the latest arrival time of the next target satellite Sat _ B is 2 minutes of the T time, and the maximum monitoring frequency of the terminal is 5 times. And the terminal re-determines the earliest arriving time and the latest arriving time of the next target satellite according to the satellite switching information, the geographic position of the terminal and the mobile parameters. The terminal may determine that the next target satellite arrives 55 seconds later than the earliest time T and 2 minutes later than the latest time T, that is, the terminal estimates the arrival time of the new target satellite again. The terminal then enters sleep mode and wakes up after 55 seconds of time T. And the terminal starts to monitor the next target satellite after waking up, detects the downlink signal of the next target satellite after monitoring for 3 times, executes satellite switching operation, and successfully accesses the next target satellite and starts to communicate.
Example three
The method comprises the steps that a satellite Sat _ A which is in communication connection with a terminal at present generates satellite switching information and sends the satellite switching information to the terminal, and the terminal receives the satellite switching information sent by the Sat _ A at the moment T. The satellite switching information indicates that the earliest arrival time of the next target satellite Sat _ B is 1 minute after the T time, the latest arrival time of the next target satellite Sat _ B is 2 minutes after the T time, and the maximum monitoring time interval of the terminal is 20 ms. And the terminal re-determines the earliest arriving time and the latest arriving time of the next target satellite according to the satellite switching information, the geographic position of the terminal and the mobile parameters. The terminal may determine that the next target satellite arrives 55 seconds later than the earliest time T and 2 minutes later than the latest time T, that is, the terminal estimates the arrival time of the new target satellite again. The terminal then enters sleep mode and wakes up after 55 seconds of time T. And the terminal starts to monitor the next target satellite after waking up, and does not detect the downlink signal of the target satellite after the maximum monitoring time interval is 20 ms. The terminal sets the self sleep time to be 50ms and re-enters the sleep mode, the terminal wakes up again after 50ms and starts monitoring, detects the downlink signal of the next target satellite within 20ms, executes the satellite switching operation, successfully accesses the next target satellite and starts communication.
Example four
The method comprises the steps that a satellite Sat _ A which is in communication connection with a terminal at present generates satellite switching information and sends the satellite switching information to the terminal, and the terminal receives the satellite switching information sent by the Sat _ A at the moment T. The satellite switching information indicates that the earliest arrival time of the next target satellite Sat _ B is 1 minute after the T time, the latest arrival time of the next target satellite Sat _ B is 2 minutes after the T time, and the maximum monitoring time interval of the terminal is 20 ms. And the terminal determines the earliest arriving time and the latest arriving time of the next target satellite again according to the satellite switching information, the geographical position of the terminal and the mobile parameters. The terminal can determine that the earliest arriving time of the next target satellite is 55 seconds later than the T time, and the latest arriving time is 2 minutes later than the T time, namely the terminal estimates the arriving time of the new target satellite. The terminal then goes to sleep and wakes up after 90 seconds of time T. And the terminal starts to monitor the next target satellite after waking up, and does not detect the downlink signal of the next target satellite after monitoring for 20 ms. The terminal sets the sleep time to 50ms and re-enters the sleep state. And after 50ms, the terminal wakes up again and starts monitoring, the downlink signal of the next target satellite is not detected yet within 20ms, the terminal sets the sleep time again for 25ms, and the terminal enters the sleep state again. And after 25ms, the terminal wakes up again and starts monitoring, detects the downlink signal of the next target satellite within 20ms, executes satellite switching operation, successfully accesses the target satellite and starts communication.
Example five
The terminal sends a sleep request to a source satellite Sat _ A which is currently in communication connection with the terminal, and receives a satellite switching information instruction sent by the source satellite Sat _ A at the time T, wherein the satellite switching information instructs that the earliest arrival time of a next target satellite Sat _ B is 1 minute after the time T, the latest arrival time is 2 minutes after the time T, and the maximum monitoring time interval of the terminal is 20 ms; and the terminal estimates the arrival time of the next target satellite, and determines that the earliest arrival time of the next target satellite is 1 minute after the T time, and the latest arrival time of the next target satellite is 2 minutes after the T time, namely the terminal does not adjust the arrival time of the next target satellite indicated by the source satellite Sat _ A. The terminal then goes to sleep and wakes up after 1 minute of time T. And the terminal starts monitoring the next target satellite after waking up, detects the downlink signal of the next target satellite within 20ms, executes satellite switching operation, successfully accesses the target satellite and starts communication.
According to another aspect of the present invention, an embodiment of the present invention provides a non-terrestrial network communication method, which is applied to a satellite, and the method includes: under the condition that communication connection is established with a terminal, the satellite generates satellite switching information according to the communication service coverage and the motion parameters of the satellite and the geographic position and the motion parameters of the terminal; sending the satellite switching information to the terminal to trigger the terminal to execute satellite switching operation based on the satellite switching information; the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of each target satellite.
Further, the generating the satellite switching information comprises: the satellite receives a dormancy request sent by the terminal and generates satellite switching information according to the dormancy request; the sleep request comprises a service model of the terminal, the source satellite screens at least one target satellite capable of providing communication service for the terminal according to the service model, and the terminal is instructed in the satellite switching information to switch the state of the terminal to the RRC inactive state under the condition that the time of waking up the terminal next time and the source satellite are still in the coverage range of providing communication service for the terminal, so that the communication connection is directly reestablished with the source satellite when the terminal wakes up next time.
It should be understood that, for specific limitations, implementation manners, and effects of the foregoing steps, reference may be made to the foregoing embodiment of the non-terrestrial network communication method, and details are not described herein again.
According to another aspect of the present invention, an embodiment of the present invention provides a non-terrestrial network communication method, which is applied to a terminal, and the method includes: receiving satellite switching information from a source satellite, wherein the satellite switching information comprises the respective earliest arrival time, latest arrival time and the maximum monitoring threshold of at least one target satellite; re-determining the respective re-determined earliest and latest arrival time of the at least one target satellite according to the satellite switching information, the geographic position of the satellite switching information and the movement parameter; performing a satellite handoff operation based on the respective reset earliest and latest arrival times of the at least one target satellite.
Further, said performing a satellite handoff operation based on a respective reset earliest and latest arrival time of said at least one target satellite comprises:
according to the arrival sequence, the following switching operation is sequentially executed for each target satellite:
(1) determining an earliest arriving target satellite of the at least one target satellite as a current target satellite;
(2) determining the current sleep time corresponding to the current target satellite based on the current working state of the terminal;
(3) entering a sleep mode within the current sleep time corresponding to the current target satellite, and starting to monitor a signal sent by the current target satellite within a maximum monitoring threshold corresponding to the current target satellite after the sleep mode is finished so as to try to establish communication connection with the current target satellite;
(4) if the communication connection with the current target satellite is successfully established, terminating the switching operation;
(5) if the communication connection with the current target satellite fails and the total attempt time or the total number of attempts is not larger than a preset threshold value, returning to the step (2), if the communication connection with the current target satellite fails and the total attempt time or the total number of attempts is larger than the preset threshold value, entering the step (6), wherein the total attempt time is set according to the latest arrival time of the current target satellite provided by the satellite switching information or the latest arrival time of the current target satellite reset by the terminal, and the total number of attempts is set according to the latest arrival time of the current target satellite provided by the satellite switching information or the latest arrival time of the current target satellite reset by the terminal;
(6) and (3) taking the next earliest arrived target satellite after the current target satellite passes by as a new current target satellite, and returning to the step (2).
It should be understood that, for specific limitations, implementation manners, and effects of the foregoing steps, reference may be made to the foregoing embodiment of the non-terrestrial network communication method, and details are not described herein again.
According to another aspect of the present invention, an embodiment of the present invention provides a communication apparatus for a satellite in a non-terrestrial network.
Fig. 8 is a block diagram illustrating a communication apparatus applied to a satellite of a non-terrestrial network according to an embodiment of the present invention.
As shown in fig. 8, the apparatus 200 includes: a generating unit 210, configured to, in a case that a communication connection has been established with a terminal, generate satellite handover information by the satellite according to a communication service coverage and a motion parameter of the satellite, and a geographic position and a motion parameter of the terminal; a sending unit 220, configured to send the satellite switching information to the terminal, so as to trigger the terminal to perform a satellite switching operation based on the satellite switching information; the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of each target satellite.
The apparatus 200 generates satellite switching information and transmits the satellite switching information to the terminal, so that the terminal can determine the earliest arrival time and the latest arrival time of the target satellite again according to the satellite switching information, the geographical position of the terminal and the movement parameter. When the arrival time of the target satellite is later than the awakening time of the terminal, meaningless signal monitoring performed after the terminal is awakened is avoided, and the power consumption of the terminal is saved.
It should be understood that other aspects and effects of the communication apparatus can be found in the foregoing non-terrestrial network communication method, and are not described herein again.
According to another aspect of the present invention, an embodiment of the present invention provides a communication apparatus, which is applied to a terminal of a non-terrestrial network.
Fig. 9 is a block diagram illustrating a communication device applied to a satellite of a non-terrestrial network according to an embodiment of the present invention.
As shown in fig. 9, the apparatus 300 includes: a receiving unit 310, configured to receive satellite handover information from a source satellite, where the satellite handover information includes an earliest arrival time, a latest arrival time, and a maximum listening threshold of each of at least one target satellite; a re-determining unit 320, configured to re-determine a re-determined earliest arrival time and a re-determined latest arrival time of each of the at least one target satellite according to the satellite switching information, the geographic location of the target satellite, and the movement parameter; a switching unit 330, configured to perform a satellite switching operation based on the respective re-determined earliest and latest arrival times of the at least one target satellite.
Further, the switching unit 330 performs the satellite switching operation as follows: according to the arrival sequence, sequentially executing the following operations for each target satellite:
(1) determining an earliest arriving target satellite of the at least one target satellite as a current target satellite;
(2) determining the current sleep time corresponding to the current target satellite based on the current working state of the terminal;
(3) entering a sleep mode within the current sleep time corresponding to the current target satellite, and starting to monitor a signal sent by the current target satellite within a maximum monitoring threshold corresponding to the current target satellite after the sleep mode is finished so as to try to establish communication connection with the current target satellite;
(4) if the communication connection with the current target satellite is successfully established, terminating the switching operation;
(5) if the communication connection with the current target satellite fails and the total attempt time or the total number of attempts is not larger than a preset threshold value, returning to the step (2), if the communication connection with the current target satellite fails and the total attempt time or the total number of attempts is larger than the preset threshold value, entering the step (6), wherein the total attempt time is set according to the latest arrival time of the current target satellite provided by the satellite switching information or the latest arrival time of the current target satellite reset by the terminal, and the total number of attempts is set according to the latest arrival time of the current target satellite provided by the satellite switching information or the latest arrival time of the current target satellite reset by the terminal;
(6) and (3) taking the next earliest arriving target satellite after the current target satellite passes by as a new current target satellite, and returning to the step (2).
The receiving unit 310 and the re-determining unit 320 in the apparatus 300 described above can enable the terminal to re-determine the earliest and latest arrival time of the target satellite according to the satellite switching information and its own geographic location and movement parameters. When the arrival time of the target satellite is later than the awakening time of the terminal, meaningless signal monitoring performed after the terminal is awakened is avoided, and the power consumption of the terminal is saved.
It should be understood that other aspects and effects of the communication apparatus can be found in the foregoing non-terrestrial network communication method, and are not described herein again.
In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when executed by a processor, implements the non-terrestrial network communication method applied to a satellite as in any of the embodiments described above.
In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the non-terrestrial network communication method applied to a terminal as in any of the embodiments described above.
For specific limitations and implementation of the above steps, reference may be made to an embodiment of a non-terrestrial network communication method, which is not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The non-terrestrial network communication method, the communication device and the storage medium provided by the embodiment of the present invention are described in detail above, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (16)

1. A method of non-terrestrial network communication, the method comprising:
a source satellite which is in communication connection with a terminal at present generates satellite switching information and sends the satellite switching information to the terminal, wherein the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of at least one target satellite;
the terminal determines the re-determined earliest and latest arrival time of each target satellite based on the received satellite switching information, the geographic position of the terminal and the movement parameter;
the terminal executes satellite switching operation according to the respective reset earliest arrival time and the reset latest arrival time of the at least one target satellite;
wherein between the terminal upon waking up and the latest arrival time of the terminal according to the respective re-fix of the at least one target satellite,
after the terminal reaches the maximum monitoring threshold, if the terminal still does not detect the at least one target satellite, the terminal needs to temporarily enter a sleep mode;
and after the terminal temporarily enters a sleep mode, if the terminal does not reach the reset latest arrival time of the at least one target satellite, the terminal wakes up again after the preset sleep time.
2. The non-terrestrial network communication method of claim 1, wherein the terminal performing a satellite handoff operation based on the respective redirected earliest and latest arrival times of the at least one target satellite comprises:
according to the arrival sequence, the terminal sequentially carries out the following switching operation aiming at each target satellite:
(1) determining an earliest arriving target satellite of the at least one target satellite as a current target satellite;
(2) determining the current sleep time corresponding to the current target satellite based on the current working state of the terminal;
(3) entering a sleep mode within the current sleep time corresponding to the current target satellite, and starting to monitor a signal sent by the current target satellite within a maximum monitoring threshold corresponding to the current target satellite after the sleep mode is finished so as to try to establish communication connection with the current target satellite;
(4) if the communication connection with the current target satellite is successfully established, terminating the switching operation;
(5) if the communication connection with the current target satellite fails to be established, returning to the step (2) if the total attempt time or the number of attempts is not larger than a preset threshold, and if the communication connection with the current target satellite fails to be established, entering a step (6) if the total attempt time or the number of attempts is larger than the preset threshold, wherein the total attempt time or the number of attempts is at least set according to the latest arrival time of the current target satellite provided by the satellite switching information or the latest arrival time of the current target satellite reset by the terminal;
(6) and (3) taking the next earliest arrived target satellite after the current target satellite passes through as a new current target satellite, and returning to the step (2).
3. The non-terrestrial network communication method of claim 2, wherein, for each of the current target satellites, an end time of each of the current sleep times for the current target satellite is after the reset earliest time of arrival for the target satellite and before the reset latest time of arrival for the target satellite.
4. The non-terrestrial network communication method of claim 3, wherein the maximum listening threshold comprises a maximum listening time and/or a maximum number of listening times;
wherein, in case that the maximum listening threshold only includes a maximum listening time, the step (3) comprises: if the signal sent by the current target satellite cannot be successfully monitored within the maximum monitoring time, determining that the communication connection with the current target satellite fails to be established;
in a case that the maximum listening threshold only includes a maximum number of listening times, the step (3) includes: if the signal sent by the current target satellite cannot be successfully monitored within the maximum monitoring times, determining that the communication connection with the current target satellite fails to be established;
in the case that the maximum listening threshold includes a maximum listening time and a maximum listening number, the step (3) includes: and if the signal sent by the current target satellite cannot be successfully monitored under the condition that the number of monitoring times within the maximum monitoring time reaches the maximum monitoring number, determining that the communication connection with the current target satellite fails to be established.
5. The non-terrestrial network communication method of claim 4,
and in the case that a plurality of times of current sleep time is determined for the same current target satellite, the values of the plurality of times of current sleep time are sequentially reduced.
6. The non-terrestrial network communication method of claim 5, wherein the method further comprises: after the terminal successfully establishes the communication connection with the current target satellite, the following operations are executed:
counting whether the number of times that the terminal enters the sleep mode for the current target satellite is larger than a first preset threshold or not, or whether the sleep time corresponding to the terminal entering a second sleep mode for the current target satellite is larger than a second preset threshold or not;
when the times are larger than the first preset threshold value or the sleep time corresponding to the entering of the second sleep mode is larger than a second preset threshold value, determining that the awakening time after the first sleep mode is ended is too early, and reporting the measurement information to the current target satellite;
and the current target satellite estimates the arrival time of the next target satellite in time again according to the measurement information.
7. The non-terrestrial network communication method according to claim 6, wherein the measurement information includes at least one of:
the satellite handoff information provided by the source satellite;
the geographic position and the motion parameters of the terminal;
the time when the terminal wakes up each time;
the time when the terminal enters the sleep mode each time;
a wake-up time counter set when the terminal enters a sleep mode each time;
the number of times the terminal enters the sleep mode;
the number of wake-ups of the terminal.
8. The non-terrestrial network communication method of claim 1, wherein prior to the generating and sending the satellite handoff information to the terminal, the method further comprises:
the source satellite receives a dormancy request sent by the terminal and generates satellite switching information according to the dormancy request;
the sleep request comprises a service model of the terminal, the source satellite screens at least one target satellite capable of providing communication service for the terminal according to the service model, and when the situation that the source satellite is still in the coverage range of providing communication service for the terminal at the time of determining to wake up the terminal next time is determined, the terminal is indicated in the satellite switching information to switch the state of the terminal to the RRC inactive state, so that the communication connection is directly reestablished with the source satellite when the terminal wakes up the next time.
9. A non-terrestrial network communication method applied to a satellite, the method comprising:
under the condition that communication connection is established with a terminal, the satellite generates satellite switching information according to the communication service coverage and the motion parameters of the satellite and the geographic position and the motion parameters of the terminal;
sending the satellite switching information to the terminal to trigger the terminal to execute satellite switching operation based on the satellite switching information;
the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of at least one target satellite;
the generating satellite switching information comprises:
the satellite receives a dormancy request sent by the terminal and generates satellite switching information according to the dormancy request;
the sleep request comprises a service model of the terminal, a source satellite screens at least one target satellite capable of providing communication service for the terminal according to the service model, and when the source satellite is still in a coverage range for providing communication service for the terminal at the time of determining the next time of waking up of the terminal, the terminal is indicated in the satellite switching information to switch the state of the terminal to an RRC (radio resource control) inactivated state, so that the communication connection is directly reestablished with the source satellite when the terminal wakes up next time.
10. A non-terrestrial network communication method is applied to a terminal, and is characterized by comprising the following steps:
receiving satellite switching information from a source satellite, wherein the satellite switching information comprises the earliest arrival time, the latest arrival time and the maximum monitoring threshold of at least one target satellite;
re-determining the respective re-determined earliest and latest arrival time of the at least one target satellite according to the satellite switching information, the geographic position of the satellite switching information and the movement parameter;
performing a satellite handoff operation based on the respective reset earliest and latest arrival times of the at least one target satellite;
wherein between the terminal upon waking up and the latest arrival time of the terminal according to the respective re-determination of the at least one target satellite,
after the terminal reaches the maximum monitoring threshold, if the terminal still does not detect the at least one target satellite, the terminal needs to temporarily enter a sleep mode;
and after the terminal temporarily enters a sleep mode, if the terminal does not reach the reset latest arrival time of the at least one target satellite, the terminal wakes up again after the preset sleep time.
11. The non-terrestrial network communication method of claim 10, wherein performing a satellite handoff operation based on the respective re-determined earliest and latest arrival times of the at least one target satellite comprises:
according to the arrival sequence, the following switching operation is sequentially executed for each target satellite:
(1) determining an earliest arriving target satellite of the at least one target satellite as a current target satellite;
(2) determining the current sleep time corresponding to the current target satellite based on the current working state of the terminal;
(3) entering a sleep mode within the current sleep time corresponding to the current target satellite, and starting to monitor a signal sent by the current target satellite within a maximum monitoring threshold corresponding to the current target satellite after the sleep mode is finished so as to try to establish communication connection with the current target satellite;
(4) if the communication connection with the current target satellite is successfully established, terminating the switching operation;
(5) if the communication connection with the current target satellite fails to be established, returning to the step (2) if the total attempt time or the number of attempts is not greater than a preset threshold, and if the communication connection with the current target satellite fails to be established, entering the step (6) if the total attempt time or the number of attempts is greater than the preset threshold, wherein the total attempt time or the number of attempts is at least set according to the latest arrival time of the current target satellite provided by the satellite switching information or the latest arrival time of the current target satellite reset by the terminal;
(6) and (3) taking the next earliest arrived target satellite after the current target satellite passes by as a new current target satellite, and returning to the step (2).
12. A communications device for use with a satellite other than a terrestrial network, the device comprising:
the generating unit is used for generating satellite switching information according to the communication service coverage and the motion parameters of the satellite and the geographic position and the motion parameters of the terminal under the condition that the communication connection is established with the terminal;
a sending unit, configured to send the satellite switching information to the terminal, so as to trigger the terminal to perform a satellite switching operation based on the satellite switching information;
the satellite switching information comprises the respective earliest arrival time, latest arrival time and the maximum monitoring threshold of at least one target satellite;
wherein the generating satellite switching information comprises:
the satellite receives a dormancy request sent by the terminal and generates satellite switching information according to the dormancy request;
the sleep request comprises a service model of the terminal, a source satellite screens at least one target satellite capable of providing communication service for the terminal according to the service model, and under the condition that the source satellite is still in a coverage range for providing the communication service for the terminal when the source satellite determines that the source satellite wakes up next time of the terminal, the terminal is indicated in the satellite switching information to switch the state of the terminal to the RRC inactive state, so that the communication connection is directly reestablished with the source satellite when the terminal wakes up next time.
13. A communication apparatus for a terminal of a non-terrestrial network, the apparatus comprising:
a receiving unit, configured to receive satellite handover information from a source satellite, where the satellite handover information includes an earliest arrival time, a latest arrival time, and a maximum listening threshold of each of at least one target satellite;
a re-determining unit, configured to re-determine a re-determined earliest and a re-determined latest arrival time of each of the at least one target satellite according to the satellite switching information, the geographic location of the target satellite, and the movement parameter;
a switching unit for performing a satellite switching operation based on the respective re-determined earliest and latest arrival times of the at least one target satellite;
a mode adjusting unit, configured to after the terminal wakes up until the terminal arrives at the latest time according to the re-determination of each of the at least one target satellite, after the terminal reaches the maximum monitoring threshold, if the terminal still does not detect the at least one target satellite, the terminal needs to temporarily enter a sleep mode; and after the terminal temporarily enters a sleep mode, if the terminal does not reach the reset latest arrival time of the at least one target satellite, the terminal wakes up again after the preset sleep time.
14. The communications apparatus of claim 13, wherein the switching unit performs the satellite switching operation as follows:
according to the arrival sequence, the following operations are sequentially executed for each target satellite:
(1) determining an earliest arriving target satellite of the at least one target satellite as a current target satellite;
(2) determining the current sleep time corresponding to the current target satellite based on the current working state of the terminal;
(3) entering a sleep mode within the current sleep time corresponding to the current target satellite, and starting to monitor a signal sent by the current target satellite within a maximum monitoring threshold corresponding to the current target satellite after the sleep mode is finished so as to try to establish communication connection with the current target satellite;
(4) if the communication connection with the current target satellite is successfully established, terminating the switching operation;
(5) if the communication connection with the current target satellite fails to be established, returning to the step (2) if the total attempt time or the number of attempts is not greater than a preset threshold, and if the communication connection with the current target satellite fails to be established, entering the step (6) if the total attempt time or the number of attempts is greater than the preset threshold, wherein the total attempt time or the number of attempts is at least set according to the latest arrival time of the current target satellite provided by the satellite switching information or the latest arrival time of the current target satellite reset by the terminal;
(6) and (3) taking the next earliest arriving target satellite after the current target satellite passes by as a new current target satellite, and returning to the step (2).
15. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, implements the non-terrestrial network communication method according to claim 9.
16. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, implements the non-terrestrial network communication method according to any one of claims 10 to 11.
CN202210511755.2A 2022-05-12 2022-05-12 Non-ground network communication method, communication device and storage medium Active CN114615717B (en)

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