Satellite internet emergency communication method and device

Abstract

The invention discloses a satellite internet emergency communication method and device, and the method comprises the steps: enabling an emergency satellite communication mode through a direct connection satellite communication device, entering a coverage enhancement state, and carrying out the communication with a satellite base station; the non-direct-connection terminal equipment searches at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band, and determines that direct-connection satellite communication equipment exists nearby; the non-direct-connection terminal equipment can quickly discover the nearby direct-connection satellite communication equipment while ensuring that the direct-connection satellite communication equipment communicates with the satellite base station in the coverage enhancement state, so that the non-direct-connection terminal equipment can efficiently access the satellite internet.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite Internet, and particularly to a method and device for satellite Internet emergency communication. Background Art

[0002] Satellite Internet is an Internet based on satellite communication. By launching a certain number of satellites to form a large-scale network, it can radiate the whole world, build a large satellite system with real-time information processing ability, and provide communication services such as broadband Internet access to ground and air terminals. According to the orbital altitude, satellite constellations are mainly divided into three categories: low-earth orbit, medium-earth orbit, and high-earth orbit. Among them, low-earth orbit satellites are suitable for developing satellite Internet services due to their small transmission delay, low link loss, flexible launch, rich application scenarios, and low overall manufacturing cost.

[0003] Satellite Internet plays an important role in emergency communication. In the event of natural disasters or emergencies, the ground communication network is often damaged or interrupted, resulting in communication difficulties. At this time, satellite Internet can provide reliable communication services for emergency rescue teams and disaster-stricken areas through its global coverage and high-speed data transmission capabilities. Satellite Internet supports direct access of various terminals to satellite base stations, including direct satellite communication devices such as fixed terminals, mobile terminals, and portable terminals.

[0004] In the disaster area, not all terminal devices can establish a connection directly with the satellite base station. For these non-direct connection terminal devices, how to discover and access the satellite Internet by relying on direct satellite communication devices to achieve fast, intelligent, and efficient self-organizing communication is an urgent problem to be solved. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a method and device for satellite Internet emergency communication, including that the direct satellite communication device turns on the emergency satellite communication mode, enters the coverage enhancement mode, and communicates with the satellite base station; the non-direct connection terminal device searches for signals with specific characteristics in a specific frequency band to determine the existence of a direct satellite communication device nearby. By this method, while ensuring the communication between the direct satellite communication device and the satellite base station in the coverage enhancement state, the non-direct connection terminal device can quickly discover the direct satellite communication device nearby, so as to efficiently access the satellite Internet and achieve self-organizing communication.

[0006] To achieve the above purpose, according to the first aspect of the present invention, the present invention provides a method for satellite Internet emergency communication, and the method includes the following steps:

[0007] The direct satellite communication device turns on the emergency satellite communication mode, enters the coverage enhancement state, and communicates with the satellite base station;

[0008] The non-direct-connected terminal device searches for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band, and determines that there is a direct-connected satellite communication device nearby.

[0009] Preferably, the direct-connected satellite communication device turns on the emergency satellite communication mode, including the following steps:

[0010] Manually turned on by the user of the direct-connected satellite communication device; or automatically turned on by the direct-connected satellite communication device after detecting no fourth signal sent by the terrestrial base station within the first time period; or turned on after receiving an instruction from the satellite base station.

[0011] Preferably, when the direct-connected satellite communication device turns on after receiving an instruction from the satellite base station, it includes the following steps:

[0012] After the satellite base station determines that the direct-connected satellite communication device is located in a disaster area, it sends an instruction signaling for turning on the emergency satellite communication mode to instruct the direct-connected satellite communication device to turn on the emergency satellite communication mode; or,

[0013] The direct-connected satellite communication device sends an opening request message for the emergency satellite communication mode to the satellite base station, and turns on the emergency satellite communication mode after receiving the opening instruction signaling sent by the satellite base station.

[0014] Preferably, the entry into the coverage enhancement state includes the following steps:

[0015] Enter the single-band coverage enhancement state; in the single-band coverage enhancement state, the direct-connected satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band; or,

[0016] Enter the multi-band coverage enhancement state; in the multi-band coverage enhancement state, the direct-connected satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band, and repeatedly sends the downlink second signal in the first signal set in the 3GPP standard communication frequency band, and / or repeatedly sends the downlink third signal in the first signal set in the non-3GPP standard communication frequency band.

[0017] Preferably, the non-direct-connected terminal device searches for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band, and determines that there is a direct-connected satellite communication device nearby, including the following steps:

[0018] The non-direct-connected terminal device determines whether it has a transceiver for the satellite communication frequency band. If it has a transceiver for the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the satellite communication frequency band, and determines the dominant signal as the uplink first signal in the first signal set, thereby determining that there is a direct-connected satellite communication device nearby.

[0019] If the non-direct-connected terminal device does not have a transceiver for the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the 3GPP standard communication frequency band, and determines the dominant signal as the uplink second signal in the first signal set; or it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the non-3GPP standard communication frequency band, and determines the dominant signal as the uplink third signal in the first signal set, thereby determining that there is a direct-connected satellite communication device nearby.

[0020] Preferably, after determining that there is a direct-connected satellite communication device nearby, the following steps are further included:

[0021] After receiving at least one signal in the first signal set, the non-direct-connected terminal device sends a device-to-device connection request message to the direct-connected satellite communication device at a first time offset, and detects a device-to-device connection confirmation message sent by the direct-connected satellite communication device at a second time offset thereafter, and establishes a device-to-device connection with the direct-connected satellite communication device.

[0022] According to the second aspect of the present invention, the present invention provides a direct-connected satellite communication device for satellite Internet emergency communication, and the device includes:

[0023] A mode setting module, configured to turn on the emergency satellite communication mode and enter the coverage enhancement state;

[0024] A communication transceiver module, configured to communicate with a satellite base station and send at least one signal in a first signal set with a specific time-frequency domain pattern in a specific communication frequency band.

[0025] According to the third aspect of the present invention, the present invention provides a non-direct-connected terminal device for satellite Internet emergency communication, and the device includes:

[0026] A communication transceiver module, configured to search for at least one signal in a first signal set with a specific time-frequency domain pattern in a specific communication frequency band;

[0027] A judgment module, configured to determine that there is a direct-connected satellite communication device nearby.

[0028] A method and device for satellite Internet emergency communication provided by the present invention. The direct satellite communication device enables the emergency satellite communication mode, enters the coverage enhancement mode, and communicates with the satellite base station. The non-direct connection terminal device searches for signals with specific characteristics in a specific frequency band to determine the existence of a direct satellite communication device nearby. Through this method and device, the problem that the non-direct connection terminal device cannot access the satellite Internet for communication during a disaster is solved. While ensuring the communication between the direct satellite communication device and the satellite base station in the coverage enhancement state, the non-direct connection terminal device can quickly discover the direct satellite communication device nearby, so as to efficiently access the satellite Internet and achieve the effect of self-organizing network communication.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 is a schematic diagram of the architecture of a satellite Internet of the present invention;

[0032] Figure 2 is another schematic diagram of the architecture of a satellite Internet of the present invention;

[0033] Figure 3 is a flowchart of a method for satellite Internet emergency communication in an embodiment of the present invention;

[0034] Figure 4 is a flowchart for instructing a direct satellite communication device to enable the emergency satellite communication mode in an embodiment of the present invention;

[0035] Figure 5 is a flowchart of a method for satellite Internet emergency communication in another embodiment of the present invention;

[0036] Figure 6 is a schematic diagram of the structure of a direct satellite communication device for satellite Internet emergency communication in an embodiment of the present invention;

[0037] Figure 7 is a schematic diagram of the structure of a non-direct connection terminal device for satellite Internet emergency communication in an embodiment of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0039] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention pertains. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless specifically defined.

[0040] Satellite Internet can provide communication services for satellite Internet communication, or emergency rescue teams and disaster-stricken areas through its global coverage and high-speed data transmission capabilities. As Figure 1 shown, it is a schematic diagram of the architecture of a satellite Internet. The satellite base station includes a satellite and a satellite gateway located on the ground. The satellite base station can establish an access network communication connection for the direct satellite communication device and the core network. The direct satellite communication device can be a personal mobile terminal, a mobile emergency communication device, or an emergency communication ground station that has the ability to communicate directly with a satellite and has the direct satellite communication service enabled. The ability to communicate directly with a satellite means having a transceiver for direct communication with the satellite. The core network can be the core network of the fifth-generation mobile communication (5G) or the next-generation mobile communication system.

[0041] Based on Figure 1 this, Figure 2 it is a schematic diagram of the architecture of a satellite Internet provided by the present invention. The non-direct connection terminal device can access the satellite Internet through the direct satellite communication device. The non-direct connection terminal device can be a personal terminal device or an emergency communication device that has the ability to communicate directly with a satellite but cannot establish a direct connection with the satellite, or a personal mobile terminal, a mobile emergency communication device, or an emergency communication ground station that does not have the ability to communicate directly with a satellite but has 3GPP standard communication technology capabilities or non-3GPP standard communication technology capabilities. The situation where it has the ability to communicate directly with a satellite but cannot establish a direct connection with the satellite can include not having the direct satellite communication service enabled or being restricted from direct communication by the satellite base station.

[0042] In the present invention, having the communication technology capabilities of 3GPP standards means having the communication technology capabilities of the second-generation mobile communication (2G), third-generation mobile communication (3G), fourth-generation mobile communication (4G), fifth-generation mobile communication (5G), or next-generation mobile communication (such as 6G). Having the communication technology capabilities of non-3GPP standards means having the communication technology capabilities such as Wi-Fi, Bluetooth, and infrared.

[0043] For the above non-direct terminal devices, how to discover and access the satellite Internet by means of direct satellite communication devices and achieve fast, intelligent, and efficient self-organizing communication is an urgent problem to be solved.

[0044] Embodiment 1:

[0045] The present invention provides a method for satellite Internet emergency communication, as Figure 3 shown, the method may include the following steps:

[0046] S11, the direct satellite communication device turns on the emergency satellite communication mode, enters the coverage enhancement state, and communicates with the satellite base station;

[0047] S12, the non-direct terminal device searches for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band to determine that there is a direct satellite communication device nearby.

[0048] Based on this method, while ensuring the communication between the direct satellite communication device and the satellite base station in the coverage enhancement state, the non-direct terminal device can quickly discover the direct satellite communication device nearby.

[0049] Preferably, the direct satellite communication device turns on the emergency satellite communication mode, specifically including:

[0050] Manually turned on by the user of the direct satellite communication device; or automatically turned on by the direct satellite communication device after detecting no fourth signal sent by the ground base station within the first time period; or turned on after receiving an instruction from the satellite base station.

[0051] Through different methods for turning on the emergency satellite communication mode, after a disaster occurs, different departments and individuals can flexibly access and use according to their needs by selecting appropriate terminal devices and appropriate times, so as to achieve information sharing and collaborative work.

[0052] Preferably, the direct satellite communication device automatically turns on after detecting no fourth signal sent by the ground base station within the first time period, specifically including:

[0053] The first time period is, for example, 20 minutes; the fourth signal includes a downlink synchronization signal or a downlink common reference signal. The emergency satellite communication mode is determined to be enabled by detecting no downlink synchronization signal sent by the terrestrial base station within the first time period. When the terrestrial base station is normal, it sends a downlink synchronization signal on fixed time-frequency domain resources at a fixed frequency. When the terrestrial base station cannot work properly, such as when the terrestrial base station loses power, it does not send a downlink synchronization signal. In addition, for example, it is determined by detecting no downlink reference signal sent by the base station within the first time period. The downlink reference signals include cell common reference signals, etc. These downlink reference signals send the same common reference signal in all subframes and can be used for downlink channel estimation and downlink measurement. Through the above method of autonomous activation, the direct satellite communication devices in the disaster area can be activated without human intervention after a disaster occurs.

[0054] Preferably, the direct satellite communication device is activated after receiving an indication from the satellite base station, as Figure 4 shown, and specifically includes:

[0055] After the satellite base station determines that the direct satellite communication device is located in a disaster area, it actively sends an activation indication message or signaling 403 for the emergency satellite communication mode to instruct the direct satellite communication device to activate the emergency satellite communication mode; or,

[0056] The direct satellite communication device sends an activation request message 402 for the emergency satellite communication mode to the satellite base station, and activates the emergency satellite communication mode after receiving the activation indication message or signaling 403 sent by the satellite base station.

[0057] Wherein the activation indication message or signaling 403 includes a radio resource control (RRC) reconfiguration signaling, and the RRC reconfiguration signaling includes an indication field for activating the emergency satellite communication mode, the enhanced coverage status type of the direct satellite communication device, the repetition times, transmission time slot intervals, whether frequency hopping transmission is performed, frequency hopping intervals of at least one signal in the first signal set, the first time offset for the direct satellite communication device to receive an inter-device connection request sent by a non-direct terminal, and the second time offset for the direct satellite communication device to send an inter-device connection confirmation, etc.

[0058] Before the direct satellite communication device receives the activation indication message or signaling 403 for the emergency satellite communication mode sent by the satellite base station, or before the direct satellite communication device sends the activation request message 402 for the emergency satellite communication mode to the satellite base station, the direct satellite communication device also sends its capability report message 401 to the satellite base station. The capability report message includes whether the direct satellite communication device supports the emergency satellite communication mode and the supported enhanced coverage status type.

[0059] By coordinating the direct satellite communication device and the satellite base station to enable the emergency satellite communication mode, it is possible to ensure the controllable opening and closing of the emergency satellite communication mode of the direct satellite communication device, as well as the flexible configuration of the coverage enhancement state of the direct satellite communication device.

[0060] Preferably, the direct satellite communication device enters the coverage enhancement state, specifically including: entering the single-band coverage enhancement state or entering the multi-band coverage enhancement state.

[0061] When entering the single-band coverage enhancement state, the direct satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band.

[0062] For the single-band coverage enhancement mode, it is a coverage enhancement mode enabled in the satellite communication frequency band. Specifically, the coverage enhancement mode adopted by the direct satellite communication device when sending the physical uplink control channel PUCCH transmission (PUCCH is an example of the uplink first signal in the first signal set) in the satellite communication frequency band is manifested in that the PUCCH transmission is repeatedly sent in multiple time slots, and is sent at a specific frequency or a specific frequency hopping pattern on specific symbols (including start symbols, symbol intervals, and symbol lengths) in each of the time slots.

[0063] When entering the multi-band coverage enhancement state, the direct satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band, and repeatedly sends the downlink second signal in the first signal set in the 3GPP standard communication frequency band, and / or repeatedly sends the downlink third signal in the first signal set in the non-3GPP standard communication frequency band.

[0064] For example, the coverage enhancement mode in the 3GPP standard communication frequency band (such as the authorized frequency band for 5G standard communication) means that the direct satellite communication device sends specific downlink synchronization signals of the direct satellite communication device in the 3GPP standard communication frequency band, which is manifested in that the downlink synchronization signals are repeatedly sent in multiple time slots, and are sent at a specific frequency hopping pattern on specific symbols (including start symbols, symbol intervals, and symbol lengths) in each of the time slots. Among them, the specific downlink synchronization signals of the direct satellite communication device are examples of the downlink second signal.

[0065] For example, the coverage enhancement mode in a non-3GPP standard communication frequency band (such as the unlicensed band for WiFi standard communication) means that the direct satellite communication device sends specific probe signals or discovery signals of the direct satellite communication device in the non-3GPP standard communication frequency band, which is manifested as the probe signals or discovery signals being repeatedly sent in multiple time slots, and being sent in a specific frequency hopping pattern on specific symbols (including start symbols, symbol intervals, and symbol lengths) of each of the time slots. Among them, the specific probe signals or discovery signals of the direct satellite communication device are examples of the downlink third signal.

[0066] The repeated transmission of at least one signal in the first signal set in the aforementioned communication frequency band includes repeated transmission in multiple time slots, forming a specific time-frequency domain pattern in the time-frequency domain grid. The time-frequency domain pattern refers to the pattern or signal pattern drawn based on the positions where at least one signal in the first signal set appears in the time-frequency domain grid. The specific time-frequency domain pattern is a pattern preset in the non-direct connection terminal device for emergency access, or a pattern with specific semantics that the non-direct connection terminal device can recognize. For example, it is sent at a specific frequency or with specific frequency hopping on specific symbols of each of the time slots. The time-frequency resources for repeated transmission (which can be understood as positions in the time-frequency grid) are defined from two dimensions. For each transmission, in terms of time, the transmission can occupy the entire time slot, or only occupy some symbols in the time slot (a symbol is a smaller time unit than a time slot); in terms of frequency, it can be a constant frequency, or a frequency that hops at a fixed frequency interval. Occupying all symbols of the entire time slot or frequency hopping can be preferred options.

[0067] By entering different coverage enhancement states, the normal communication between the direct satellite communication device and the satellite base station is ensured, and at the same time, full-band coverage enhancement can be carried out in the satellite communication frequency band, 3GPP standard communication frequency band, and non-3GPP standard communication frequency band, so that non-direct connection terminal devices with different access capabilities can discover the direct satellite communication device according to their own capabilities.

[0068] Preferably, the non-direct connection terminal device searches for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band to determine that there is a direct satellite communication device nearby, specifically including:

[0069] Before the non-direct connection terminal device searches for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band, the search function is manually turned on by the user of the non-direct connection terminal device; or the non-direct connection terminal device autonomously turns on the search function after detecting that there is no fourth signal sent by the terrestrial base station in the second time period;

[0070] The non-direct terminal device determines whether it has a transceiver for the satellite communication frequency band. If it has a transceiver for the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the satellite communication frequency band, and determines the dominant signal as the uplink first signal in the first signal set, thereby determining that there is a direct satellite communication device nearby;

[0071] If the non-direct terminal device does not have a transceiver for the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the 3GPP standard communication frequency band, and determines the dominant signal as the downlink second signal in the first signal set; or searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the non-3GPP standard communication frequency band, and determines the dominant signal as the downlink third signal in the first signal set, thereby determining that there is a direct satellite communication device nearby.

[0072] The time-frequency domain pattern refers to a pattern drawn by the position where the dominant signal appears in the time-frequency domain grid or a signal pattern. The specific time-frequency domain pattern is a pattern preset in the non-direct terminal device for emergency access, or a pattern with specific semantics that the non-direct terminal device can recognize.

[0073] The preset pattern for emergency access may be a signal pattern that appears at a constant frequency position at fixed time intervals; or a signal pattern that appears at frequency positions that jump at fixed frequency intervals at fixed time intervals. These patterns are pre-stored in the chip of the non-direct terminal device at the time of factory, or are notified by the ground base station to store the preset pattern when communicating with the ground base station before a disaster occurs.

[0074] The pattern with specific semantics that the non-direct terminal device can recognize means that the pattern has specific semantics. For example, the signal pattern is recognized by the non-direct terminal device as patterns with specific semantics such as "SSS", "SOS", "RAN", etc.

[0075] In the non-emergency satellite communication mode, that is, under normal circumstances, at least one signal in the first signal set sent by the direct satellite communication device cannot be detected by the non-direct terminal device. However, in the coverage enhancement mode after the emergency satellite communication mode is enabled, it can be detected by the non-direct terminal device. Because at this time, at least one signal in the first signal set is transmitted with a specific time-frequency domain pattern that the non-direct terminal device can recognize.

[0076] Preferably, after determining that there is a direct satellite communication device nearby, it further includes:

[0077] After receiving at least one signal in the first signal set, the non-direct-connected terminal device sends an inter-device connection request message to the direct-connected satellite communication device at a first time offset, and detects an inter-device connection confirmation message sent by the direct-connected satellite communication device at a second time offset thereafter, and establishes an inter-device connection with the direct-connected satellite communication device.

[0078] After determining that there is a direct-connected satellite communication device nearby, the non-direct-connected terminal device establishes a connection with the direct-connected satellite communication device through device-to-device (D2D) communication technologies, WiFi technologies, Bluetooth technologies, and other inter-device direct communication technologies. These technologies can operate in a frequency band lower than the satellite communication frequency band, or in the same frequency band as the satellite communication frequency band. After receiving the PUCCH signal (an embodiment of at least one signal in the first signal set), the non-direct-connected terminal device sends an inter-device connection request message to the direct-connected satellite communication device at a first time offset, and detects an inter-device connection confirmation message, or an inter-device connection rejection message, sent by the direct-connected satellite communication device after the second time offset.

[0079] The non-direct-connected terminal device sends a connection request message at a first time offset after receiving the PUCCH signal to establish a fixed relationship between the PUCCH transmission time and the connection request message time, so that after the direct-connected satellite communication device sends the PUCCH, it knows at which time to receive the connection request message. The non-direct-connected terminal device detects the inter-device connection confirmation message sent by the direct-connected satellite communication device at a second time offset after sending the inter-device connection request message to the direct-connected satellite communication device, in order to establish a fixed relationship between the inter-device connection request message and the inter-device connection confirmation message time, so that the non-direct-connected terminal device can know at which time to receive the connection confirmation message.

[0080] Embodiment 2:

[0081] The present invention provides a method for satellite Internet emergency communication, as Figure 5 shown, the method may include the following steps:

[0082] 500. The direct-connected satellite communication device performs normal satellite communication with the satellite base station.

[0083] 501. The direct-connected satellite communication device enables the emergency satellite communication mode and enters the coverage enhancement state.

[0084] Among them, the direct satellite communication device enables the emergency satellite communication mode, which can be specifically enabled manually by the user of the direct satellite communication device; or the direct satellite communication device enables it autonomously after detecting no fourth signal sent by the ground base station within the first time period; or the direct satellite communication device enables it after receiving an instruction from the satellite base station. The direct satellite communication device enters the coverage enhancement state, which specifically includes: entering the single-band coverage enhancement state or entering the multi-band coverage enhancement state.

[0085] 502. The direct satellite communication device sends at least one signal in the first signal set to the satellite base station. Specifically, in the single-band coverage enhancement state, the direct satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band; in the multi-band coverage enhancement state, the direct satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band, and repeatedly sends the downlink second signal in the first signal set in the 3GPP standard communication frequency band, and / or repeatedly sends the downlink third signal in the first signal set in the non-3GPP standard communication frequency band. The first signal set at least includes the uplink first signal, the downlink second signal, and the downlink third signal.

[0086] 503. The non-direct connection terminal device searches for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band to determine that there is a direct satellite communication device nearby. Specifically, it includes:

[0087] The non-direct connection terminal device determines whether it has a transceiver in the satellite communication frequency band. If it has a transceiver in the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band in the satellite communication frequency band, and determines the dominant signal as the uplink first signal in the first signal set, thereby determining that there is a direct satellite communication device nearby;

[0088] If the non-direct connection terminal device does not have a transceiver in the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band in the 3GPP standard communication frequency band, and determines the dominant signal as the downlink second signal in the first signal set; or searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band in the non-3GPP standard communication frequency band, and determines the dominant signal as the downlink third signal in the first signal set, thereby determining that there is a direct satellite communication device nearby.

[0089] 504. After the non-direct terminal device determines that there is a direct satellite communication device nearby, the non-direct terminal device sends an inter-device connection request message to the direct satellite communication device at a first time offset after receiving at least one signal in the first signal set. The corresponding direct satellite communication device detects the inter-device connection request message sent by the non-direct terminal device at the first time offset after sending at least one signal in the first signal set.

[0090] 505. The non-direct terminal device detects the inter-device connection confirmation message sent by the direct satellite communication device at a second time offset. The corresponding direct satellite communication device sends an inter-device connection confirmation message to the non-direct terminal device at the second time offset after receiving the inter-device connection request message sent by the non-direct terminal device. After the non-direct terminal device successfully receives the inter-device connection confirmation message, an inter-device connection is successfully established with the direct satellite communication device.

[0091] The inter-device connection request and confirmation messages exchanged between the non-direct terminal device and the direct satellite communication device can be used to establish an inter-device connection and can also be used to negotiate the communication frequency band used for the inter-device connection. For example, the non-direct terminal device and the direct satellite communication device exchange inter-device connection request and confirmation messages in a communication technology frequency band (such as the satellite communication frequency band) to negotiate to establish an inter-device connection in another communication technology frequency band (WiFi unlicensed frequency band).

[0092] 506. After the non-direct terminal device establishes a connection with the direct satellite communication device, the direct satellite communication device acts as a relay device to forward the communication data between the non-direct terminal device and the satellite base station.

[0093] Specifically, if the non-direct terminal device and the direct satellite communication device establish a connection in the satellite communication frequency band, the direct satellite communication device acts as a lower-layer relay device and forwards the communication data between the non-direct terminal device and the satellite base station at the physical layer or the media access layer; at this time, one physical layer or media access layer of the direct satellite communication device is connected to both the non-direct terminal device and the satellite base station.

[0094] If the non-direct terminal device and the direct satellite communication device establish a connection in the 3GPP standard communication frequency band, the direct satellite communication device acts as a middle-layer relay device and forwards the communication data between the non-direct terminal device and the satellite base station at the media access layer, the link control layer, or the radio resource control layer; at this time, one media access layer, link control layer, or radio resource control layer of the direct satellite communication device controls two different physical layers to be respectively connected to the non-direct terminal device and the satellite base station.

[0095] If the non-direct terminal device establishes a connection with the direct satellite communication device in a non-3GPP standard communication frequency band, the direct satellite communication device acts as a high-layer relay device and forwards the communication data between the non-direct terminal device and the satellite base station at a layer higher than the radio resource control layer, such as the packet data convergence protocol layer; at this time, the direct satellite communication device uses two sets of air interface protocols to connect the non-direct terminal device and the satellite base station respectively.

[0096] Based on this embodiment, while ensuring the communication between the direct satellite communication device and the satellite base station in the coverage enhancement state, the non-direct terminal device can quickly discover the nearby direct satellite communication device, thereby efficiently realizing self-organizing network communication.

[0097] Embodiment 3:

[0098] The present invention provides a direct satellite communication device 60 for satellite Internet emergency communication, as Figure 6 shown, the device 60 includes:

[0099] A mode setting module 610, configured to turn on the emergency satellite communication mode and enter the coverage enhancement state;

[0100] A communication transceiver module 620, configured to communicate with the satellite base station and send at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band.

[0101] The mode setting module 610 is configured to turn on the emergency satellite communication mode, specifically: manually turned on by the user of the direct satellite communication device; or automatically turned on by the direct satellite communication device after detecting no fourth signal sent by the terrestrial base station within a first time period; or turned on after receiving an instruction from the satellite base station.

[0102] The mode setting module 610 is configured to enter the coverage enhancement state, specifically: enter the single-band coverage enhancement state or enter the multi-band coverage enhancement state. When entering the single-band coverage enhancement state, the mode setting module 610 instructs the communication transceiver module 620 to repeatedly send the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band; when entering the multi-band coverage enhancement state, the mode setting module 610 instructs the communication transceiver module 620 to repeatedly send the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band, and repeatedly send the downlink second signal in the first signal set in the 3GPP standard communication frequency band, and / or repeatedly send the downlink third signal in the first signal set in the non-3GPP standard communication frequency band.

[0103] At least one signal in the foregoing first signal set is repeatedly transmitted in the foregoing communication frequency band, including being repeatedly transmitted in multiple time slots, forming a specific time-frequency domain pattern in the time-frequency domain grid positions, such as a signal pattern formed by transmitting at a specific frequency or specific frequency hopping on a specific symbol in each of the time slots.

[0104] The direct satellite communication device 60 further includes an inter-device connection control module (not shown in Figure 6 ), and the inter-device connection control module is configured to control the communication transceiver module 620 to detect a device-to-device connection request message sent by a non-direct terminal device at a first time offset after transmitting at least one signal in the first signal set; and to control the communication transceiver module 620 to send a device-to-device connection confirmation message to the non-direct terminal device at a second time offset after receiving the device-to-device connection request message.

[0105] The direct satellite communication device 60 further includes a relay control module (not shown in Figure 6 ), and the relay control module is configured to control the communication transceiver module 620 to forward communication data between the non-direct terminal device and the satellite base station after the non-direct terminal device establishes a connection with the direct satellite communication device.

[0106] Based on this embodiment, while ensuring communication between the direct satellite communication device and the satellite base station in the coverage enhancement state, the non-direct terminal device can quickly discover nearby direct satellite communication devices, thereby enabling efficient ad-hoc network communication.

[0107] Embodiment 4:

[0108] The present invention provides a non-direct terminal device 70 for satellite Internet emergency communication. As Figure 7 shown, the device 70 includes:

[0109] A communication transceiver module 710, configured to search for at least one signal in a first signal set having a specific time-frequency domain pattern in a specific communication frequency band;

[0110] A judgment module 720, configured to determine that there is a direct satellite communication device nearby.

[0111] The communication transceiver module 710 is configured to search for at least one signal in a first signal set having a specific time-frequency domain pattern in a specific communication frequency band, specifically:

[0112] Judge whether there is a transceiver with a satellite communication frequency band (not shown in Figure 7As shown in [figure reference], if the transceiver has a satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the satellite communication frequency band; if the non-direct terminal device does not have a transceiver with a satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the 3GPP standard communication frequency band; or searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the non-3GPP standard communication frequency band.

[0113] The time-frequency domain pattern refers to the pattern or signal pattern drawn based on the position where the dominant signal appears in the time-frequency domain grid. The specific time-frequency domain pattern is a pattern preset in the non-direct terminal device for emergency access, or a pattern with specific semantics that the non-direct terminal device can recognize.

[0114] The determination module 720 is used to determine that there is a direct satellite communication device nearby, specifically:

[0115] Determine the uplink first signal, downlink second signal, and / or downlink third signal in the first signal set from the dominant signal searched by the communication transceiver module 710, so as to determine that there is a direct satellite communication device nearby.

[0116] The non-direct terminal device 70 further includes an inter-device connection control module (not shown in [figure reference]), and the inter-device connection control module is used to control the communication transceiver module 710 to send an inter-device connection request message to the direct satellite communication device at a first time offset after receiving at least one signal in the first signal set; and is used to control the communication transceiver module 710 to detect an inter-device connection confirmation message sent by the direct satellite communication device at a second time offset after sending the inter-device connection request message. Figure 7

[0117] The communication transceiver module 710 is further used to send or receive communication data with the satellite base station after the non-direct terminal device and the direct satellite communication device establish a connection, and the communication data is relayed by the direct satellite communication device as a relay device.

[0118] Based on this embodiment, while ensuring the communication between the direct satellite communication device and the satellite base station in the coverage enhancement state, the non-direct terminal device can quickly discover the nearby direct satellite communication device, so as to efficiently realize self-organizing network communication.

[0119] ​In the above embodiments, if the module / unit of the direct satellite communication device or non-direct connection terminal device for satellite Internet emergency communication is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above method embodiments of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0120] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for satellite Internet emergency communication, characterized in that, The method includes: The direct satellite communication device enables the emergency satellite communication mode, enters the coverage enhancement state, and communicates with the satellite base station; The non-direct terminal device searches for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band to determine that there is a direct satellite communication device nearby.

2. The method according to claim 1, characterized in that, The direct satellite communication device enabling the emergency satellite communication mode specifically includes: Manually enabled by the user of the direct satellite communication device; or automatically enabled by the direct satellite communication device after detecting no fourth signal sent by the terrestrial base station within the first time period; or enabled after receiving an instruction from the satellite base station.

3. The method according to claim 2, characterized in that, The direct satellite communication device being enabled after receiving an instruction from the satellite base station specifically includes: The satellite base station determines that the direct satellite communication device is located in the disaster area and then sends an enabling instruction signaling of the emergency satellite communication mode to instruct the direct satellite communication device to enable the emergency satellite communication mode; or, The direct satellite communication device sends an enabling request message of the emergency satellite communication mode to the satellite base station, and the direct satellite communication device is enabled after receiving the enabling instruction signaling of the emergency satellite communication mode sent by the satellite base station; Wherein the enabling instruction signaling includes a radio resource control (RRC) reconfiguration signaling, the RRC reconfiguration signaling includes an indication field for activating the emergency satellite communication mode, the coverage enhancement state type of the direct satellite communication device, the number of repeated transmissions, the transmission time slot interval, whether to perform frequency hopping transmission, the frequency hopping interval of at least one signal in the first signal set, the first time offset for the direct satellite communication device to receive the device-to-device connection request sent by the non-direct terminal, and the second time offset for the direct satellite communication device to send the device-to-device connection confirmation.

4. The method according to claim 1, characterized in that, The entering the coverage enhancement state specifically includes: Entering the single-band coverage enhancement state; wherein in the single-band coverage enhancement state, the direct satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band; or, Entering the multi-band coverage enhancement state; wherein in the multi-band coverage enhancement state, the direct satellite communication device repeatedly sends the uplink first signal in the first signal set to the satellite base station in the satellite communication frequency band, and repeatedly sends the downlink second signal in the first signal set in the 3GPP standard communication frequency band, and / or repeatedly sends the downlink third signal in the first signal set in the non-3GPP standard communication frequency band; Wherein the repeated transmission of at least one signal in the first signal set in the foregoing communication frequency band includes repeated transmission in multiple time slots, forming a specific time-frequency domain pattern in the time-frequency domain grid.

5. The method according to claim 1, characterized in that, The non-direct terminal device searching for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band to determine that there is a direct satellite communication device nearby specifically includes: The non-direct-connected terminal device determines whether it has a transceiver for the satellite communication frequency band. If it has a transceiver for the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the satellite communication frequency band, and determines the dominant signal as the uplink first signal in the first signal set, thereby determining that there is a direct-connected satellite communication device nearby; If the non-direct-connected terminal device does not have a transceiver for the satellite communication frequency band, it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the 3GPP standard communication frequency band, and determines the dominant signal as the downlink second signal in the first signal set; or it searches for a dominant signal with a specific time-frequency domain pattern in a specific frequency band of the non-3GPP standard communication frequency band, and determines the dominant signal as the downlink third signal in the first signal set, thereby determining that there is a direct-connected satellite communication device nearby.

6. The method according to claim 5, characterized in that, The time-frequency domain pattern is a pattern drawn based on the position where the dominant signal appears in the time-frequency domain grid. The specific time-frequency domain pattern is a pattern preset in the non-direct-connected terminal device for emergency access, or a pattern with specific semantics that the non-direct-connected terminal device can recognize.

7. The method according to claim 1, characterized in that, After determining that there is a direct-connected satellite communication device nearby, it further includes: After receiving at least one signal in the first signal set, the non-direct-connected terminal device sends a device-to-device connection request message to the direct-connected satellite communication device at a first time offset, and detects a device-to-device connection confirmation message sent by the direct-connected satellite communication device at a second time offset thereafter, and establishes a device-to-device connection with the direct-connected satellite communication device.

8. A direct satellite communication device for satellite Internet emergency communication, characterized in that, The device includes: A mode setting module, configured to enable the emergency satellite communication mode and enter the coverage enhancement state; A communication transceiver module, configured to communicate with a satellite base station and send at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band.

9. A non-direct connection terminal device for satellite Internet emergency communication, characterized in that, The device includes: A communication transceiver module, configured to search for at least one signal in the first signal set with a specific time-frequency domain pattern in a specific communication frequency band; A judgment module, configured to determine that there is a direct-connected satellite communication device nearby.

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