Beam recovery method and communication device

Abstract

The invention discloses a beam recovery method and a communication device. In the method, the terminal equipment obtains a first parameter and a second parameter; receiving a reference signal through the first beam pair; if the received reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, the terminal device performs beam recovery with the first satellite through a second beam; and if the received reference signal satisfies the first condition and the second condition, the terminal device sends an access request to a second satellite. According to the method, the terminal equipment can quickly select the beam recovery strategy according to the first condition and the second condition, whether to switch the beam pair in the same satellite or to switch to other satellites for communication, so that an access request is prevented from being sent to the current service satellite all the time; but actually, the terminal equipment and the current service satellite are shielded and cannot communicate, so that the power consumption of the terminal equipment is increased, and other uplink signals are interfered.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of wireless communications, and in particular, to a beam recovery method and a communication device. Background Art

[0002] Satellite communications have their own unique advantages over terrestrial communications, such as providing a wider coverage area; satellite base stations are not easily damaged by natural disasters or external forces. If satellite communications are introduced into the future 5G communication system, it can provide communication services to areas such as oceans and forests that are not covered by terrestrial communication networks; it can enhance the reliability of the 5G communication system, for example, ensuring that users on airplanes and trains receive better communication services; it can provide more data transmission resources for the 5G communication system and increase the network speed. Therefore, supporting both terrestrial and satellite communications at the same time is the development direction of the future 5G communication system, which has relatively large benefits in terms of wide coverage, reliability, multiple connections, and high throughput.

[0003] Satellite communication has been introduced into the 3GPP standard as a communication scenario for 5G communication. In order to adapt to the characteristics of large delay and high mobility, the standard has enhanced the timing, synchronization, HARQ and other technologies. However, the existing beam recovery method in terrestrial communication is not fully applicable to beam recovery in satellite communication. How to achieve beam recovery in satellite communication is a technical problem that needs to be solved in the industry. Summary of the invention

[0004] The present application provides a beam recovery method and a communication device for realizing beam recovery in case of beam failure in a satellite communication system.

[0005] In a first aspect, an embodiment of the present application provides a beam recovery method, which can be executed by a terminal device, where the terminal device can refer to the terminal device itself, or a processor, module, chip, or chip system that implements the method in the terminal device. The method includes: the terminal device acquires a first parameter and a second parameter; the terminal device receives a reference signal through a first beam pair; if the reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, the terminal device performs beam recovery with the first satellite through a second beam pair; if the reference signal satisfies the first condition and satisfies the second condition, the terminal device sends an access request to the second satellite.

[0006] In the above method, it is possible to quickly perform beam recovery in the event of a beam failure in a satellite communication system. Specifically, the terminal device can quickly select a beam recovery strategy based on a first condition determined by a first parameter and a second condition determined by a second parameter, and whether to switch beam pairs on the same satellite or switch to other satellites for communication, so as to avoid sending access requests to the currently serving satellite all the time, but in fact, there is an obstruction between the terminal device and the currently serving satellite and communication is impossible, thereby increasing the power consumption of the terminal device and interfering with other uplink signals.

[0007] In a possible implementation, the first parameter is a first threshold, and the first condition is: the received power of the reference signal is less than or equal to the first threshold. In this implementation, the terminal device can select a beam recovery strategy based on the received power of the reference signal.

[0008] In a possible implementation, the second parameter is a second threshold of the received power of the reference signal, the first threshold is greater than the second threshold, and the second condition is: the received power of the reference signal is less than or equal to the second threshold. In this implementation, the terminal device can select a beam recovery strategy based on the received power of the reference signal to avoid sending access requests to the current serving satellite all the time, but in fact there is an obstruction between the terminal device and the current serving satellite and communication is impossible, thereby increasing the power consumption of the terminal device and interfering with other uplink signals.

[0009] In a possible implementation, the reference signal includes a synchronization signal block SSB and / or a channel state information reference signal CSI-RS.

[0010] In a possible implementation, the second parameter is a first time window; the second condition is that the reference signal reception time is within the first time window. In this implementation, the terminal device can select a beam recovery strategy based on the time window to avoid sending access requests to the current serving satellite all the time, but in fact, there is an obstruction between the terminal device and the current serving satellite and communication is impossible, thereby increasing the power consumption of the terminal device and interfering with other uplink signals.

[0011] In one possible implementation, the first time window includes a start time and an end time, or includes a start time and a time length of the first time window, or includes a start time offset and an end time offset; the start time offset represents the difference between the start time of the first time window and a first reference time, and the end time offset represents the difference between the end time of the first time window and the first reference time.

[0012] In a possible implementation, the second parameter is the range of the elevation angle between the terminal device and the first satellite; the second condition is: the elevation angle between the terminal device and the first satellite when the reference signal is received is within the range. In this implementation, the terminal device can select a beam recovery strategy based on the elevation angle to avoid sending access requests to the current serving satellite all the time, but in fact, there is an obstruction between the terminal device and the current serving satellite and communication is impossible, which increases the power consumption of the terminal device and interferes with other uplink signals.

[0013] In one possible implementation, the range includes: a starting angle and an ending angle of an elevation angle, or a starting angle offset and an ending angle offset; the starting angle offset represents the offset between the starting angle of the range and a first reference elevation angle, and the ending angle offset represents the offset between the ending angle of the range and the first reference elevation angle.

[0014] In a possible implementation, the second parameter is the first timer start threshold and the timing duration of the first timer, the threshold is the elevation angle threshold between the terminal device and the first satellite; the second condition is: when the terminal device receives the reference signal, the first timer is running. In this implementation, the terminal device can select a beam recovery strategy based on the first timer to avoid sending access requests to the current serving satellite all the time, but in fact there is an obstruction between the terminal device and the current serving satellite and communication is impossible, which causes the terminal device to increase power consumption and interfere with other uplink signals.

[0015] In a possible implementation manner, the terminal device acquires the first parameter and the second parameter, including: the terminal device receives beam failure recovery BFR information sent by the first satellite, and the BFR information includes the first parameter and the second parameter.

[0016] In a possible implementation manner, the altitude of the second satellite is higher than the altitude of the first satellite.

[0017] In a possible implementation, the method also includes: the terminal device obtains a first numerical threshold; the reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, and the terminal device performs beam recovery with the first satellite through a second beam pair, including: if the number of reference signals that meet the first condition and do not meet the second condition received by the terminal device within a first time reaches the first numerical threshold, the terminal device performs beam recovery with the first satellite through a second beam pair.

[0018] In a possible implementation, the method further includes: the terminal device obtains a second numerical threshold; the reference signal satisfies the first condition and the second condition, and the terminal device sends an access request to the second satellite, including: if the number of reference signals that meet the first condition and the second condition received by the terminal device within a second time reaches the second numerical threshold, the terminal device sends an access request to the second satellite.

[0019] In a second aspect, an embodiment of the present application provides a beam recovery method, which can be executed by a first satellite, where the first satellite can refer to the satellite itself, or a processor, module, chip, or chip system that implements the method in the satellite. The method includes: the first satellite sends a first parameter and a second parameter to a terminal device, the first parameter is used to determine a first condition, and the second parameter is used to determine a second condition; the first satellite sends a reference signal to the terminal device through a first beam pair, and the reference signal, the first condition, and the second condition are used by the terminal device to perform satellite beam recovery.

[0020] In a possible implementation, the method further includes: if the reference signal received by the terminal device meets the first condition but does not meet the second condition, the first satellite performs beam recovery with the terminal device through a second beam pair.

[0021] In a possible implementation, the reference signal, the first condition and the second condition are specifically used to: if the terminal device receives the reference signal and satisfies the first condition but does not satisfy the second condition, enable the terminal device to send an access request to the first satellite through a second beam pair; if the terminal device receives the reference signal and satisfies the first condition and satisfies the second condition, enable the terminal device to send an access request to the second satellite.

[0022] In a possible implementation, the first parameter is a first threshold; and the first condition is: the received power of the reference signal is less than or equal to the first threshold.

[0023] In a possible implementation, the second parameter is a second threshold of a received power of a reference signal, and the first threshold is greater than the second threshold; and the second condition is that the received power of the reference signal is less than or equal to the second threshold.

[0024] In a possible implementation, the reference signal includes a synchronization signal block SSB and / or a channel state information reference signal CSI-RS.

[0025] In a possible implementation manner, the second parameter is a first time window; and the second condition is that the reference signal reception time is within the first time window.

[0026] In one possible implementation, the first time window includes a start time and an end time, or includes a start time and a time length of the first time window, or includes a start time offset and an end time offset; the start time offset represents the difference between the start time of the first time window and a first reference time, and the end time offset represents the difference between the end time of the first time window and the first reference time.

[0027] In a possible implementation, the second parameter is a range of elevation angles formed between the terminal device and the first satellite; and the second condition is that the elevation angle formed between the terminal device and the first satellite when the reference signal is received is within the range.

[0028] In one possible implementation, the range includes: a starting angle and an ending angle of an elevation angle, or a starting angle offset and an ending angle offset; the starting angle offset represents the offset between the starting angle of the range and a first reference elevation angle, and the ending angle offset represents the offset between the ending angle of the range and the first reference elevation angle.

[0029] In a possible implementation, the second parameter is the first timer start threshold and the timing duration of the first timer, and the threshold is the elevation angle threshold between the terminal device and the first satellite; the second condition is that when the terminal device receives the reference signal, the first timer is running.

[0030] In a possible implementation manner, the first satellite sends the first parameter and the second parameter, including: the first satellite sends beam failure recovery BFR information, and the BFR information includes the first parameter and the second parameter.

[0031] In a possible implementation manner, the altitude of the second satellite is higher than the altitude of the first satellite.

[0032] In a possible implementation, the method also includes: the first satellite sends a first numerical threshold to the terminal device; the terminal device receives the reference signal that satisfies the first condition and does not satisfy the second condition, including: the terminal device receives, within a first time, a number of the reference signals that satisfy the first condition and do not satisfy the second condition, reaching the first numerical threshold.

[0033] In a possible implementation, the method also includes: the first satellite sends a second numerical threshold to the terminal device; the terminal device receives the reference signal that satisfies the first condition and the second condition, including: the number of reference signals that meet the first condition and the second condition received by the terminal device within a second time reaches the second numerical threshold.

[0034] In a third aspect, an embodiment of the present application provides a communication device, comprising: a processor, the processor being coupled to a memory, the memory being used to store programs or instructions, and when the program or instructions are executed by the processor, the device executes a method such as the first aspect and any possible implementation method of the first aspect.

[0035] In a fourth aspect, an embodiment of the present application provides a communication device, comprising: a processor, the processor being coupled to a memory, the memory being used to store programs or instructions, and when the program or instructions are executed by the processor, the device executes a method such as the second aspect and any possible implementation method of the second aspect.

[0036] In a fifth aspect, a communication system comprises the communication device as described in the fourth aspect and at least one communication device as described in the fifth aspect.

[0037] In a sixth aspect, an embodiment of the present application provides a chip, comprising: a processor, the processor is coupled to a memory, the memory is used to store instructions, and when the instructions are executed by the processor, the chip implements the method described in the first aspect and any one of its implementations, or implements the method described in the second aspect and any one of its implementations.

[0038] In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium. The computer-readable storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the method as described in the first aspect and any one of its implementations, or executes the method as described in the second aspect and any one of its implementations.

[0039] In an eighth aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method as described in the first aspect and any one of its implementations, or, execute the method as described in the second aspect and any one of its implementations, or. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1a , Figure 1b , Figure 1c A schematic diagram of the architecture of a satellite communication system provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the architecture of a multi-layer satellite communication system provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of a flow chart of a beam recovery method provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of a flow chart of a beam recovery method provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of a flow chart of a beam recovery method provided in an embodiment of the present application;

[0045] Figure 6 A schematic diagram of the elevation angle range provided in an embodiment of the present application;

[0046] Figure 7 A schematic diagram of a flow chart of a beam recovery method provided in an embodiment of the present application;

[0047] Figure 8 A schematic diagram of a flow chart of a beam recovery method provided in an embodiment of the present application;

[0048] Fig. 9 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0049] Fig.10 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] The core of beam management is to manage the scanning, reporting, and maintenance of static beams, and select appropriate static beams for each channel, thereby improving cell coverage and saving system overhead.

[0051] For the new radio (NR) system, beam management may include the following steps: (1) beam scanning: the base station sends a reference signal beam and performs spatial scanning at predefined time intervals; (2) beam measurement / decision: the UE measures the reference signal and selects a beam with good communication quality; (3) beam reporting: the UE reports the result of beam measurement; (4) beam indication: the base station instructs the UE to select a specified beam for communication; (5) beam failure recovery: including beam failure detection, discovery of new beams, and beam recovery processes.

[0052] Among them, when the UE's service beam is blocked, in the above step (3), the UE cannot report the measured new beam that can meet the communication conditions, resulting in reduced traffic or even dropped calls. Therefore, the NR system introduces a beam recovery mechanism, where the UE selects a candidate beam for recovery and sends an access preamble to the base station through the candidate beam, that is, the UE accesses the base station through the selected candidate beam, so that the UE can quickly obtain another available service beam, enhancing the beam robustness.

[0053] However, there are obvious differences between non-terrestrial network (NTN) systems (such as satellite communication systems) and terrestrial communication systems (such as NR systems). For example, for satellite communication systems, beam management is usually unrelated to the location information of base stations and UEs, and the behaviors and decisions of base stations and UEs are usually based on signal quality; in satellite communication systems, the communication protocol supports sending satellite ephemeris to UEs, and UEs reporting global navigation satellite system (GNSS) information to satellites. Therefore, satellites and UEs can perform beam management based on location information. For another example, in the NR system, if the direct path (LOS) beam communication fails, the communication can be restored through the indirect path (NLOS) beam; in satellite communication systems, the LOS characteristics are more obvious, and it is difficult to restore communication through the NLOS beam.

[0054] Therefore, the beam recovery mechanism in the traditional ground communication system is difficult to apply to the satellite communication system. When the beam fails, how to perform beam recovery is a problem that needs to be solved.

[0055] In view of this, an embodiment of the present application provides a beam recovery method for achieving beam recovery when a beam failure occurs in a satellite communication system.

[0056] Figure 1a , Figure 1b , Figure 1c The positioning method provided in the embodiment of the present application can be applied to Figure 1a , Figure 1b , Figure 1c In any network architecture.

[0057] exist Figure 1a In the architecture shown, the base station is deployed on the ground, the satellite is connected to the ground station through the air interface, and the ground station can be connected to the base station through a wireless or wired link. The terminal equipment on the ground accesses the mobile communication network through the air interface (the air interface can be various types of air interfaces, such as 5G air interfaces), and the satellite acts as a transmission node to forward the information of the terminal equipment.

[0058] exist Figure 1b In the architecture shown, the base station is deployed on the satellite, and the satellite is connected to the ground station through the air interface, and the ground station can be connected to the core network through a wireless or wired link. The terminal equipment on the ground communicates with the satellite base station through the air interface to access the mobile communication network. The satellite, as a base station, is connected to the ground station through the air interface NG interface, and the ground station is connected to the core network through the NG interface. The NG interface can be wireless or wired.

[0059] exist Figure 1c The architecture shown is similar to Figure 1b Compared with the architecture shown in FIG. 1 , a communication scenario between satellite base stations is added. Specifically, satellite base stations can communicate with each other through an Xn interface.

[0060] exist Figure 1a-Figure 1c In the present invention, the terminal devices may include various types of terminal devices supporting the new air interface, such as mobile phones, tablet computers, vehicle-mounted terminal devices, wearable terminal devices, etc. The terminal devices can access the satellite network through the air interface and initiate calls, surf the Internet and other services.

[0061] Base stations are mainly used to provide wireless access services, dispatch wireless resources to access terminal devices, and provide reliable wireless transmission protocols and data encryption protocols. Figure 1a In the architecture shown, the satellite does not have the function of a base station, but the communication between the terminal and the base station is realized through the satellite; Figure 1b and Figure 1c In this case, the satellite is the base station and has the function of providing wireless access services.

[0062] The core network is mainly used to provide functions such as user access control, mobility management, session management, user security authentication, and billing. The core network can be composed of multiple functional units and can be divided into functional entities of the control plane and the data plane. The access and mobility management function (AMF) entity is responsible for user access management, security authentication, and mobility management. The user plane function (UPF) entity is responsible for managing the transmission of user plane data, traffic statistics, and secure eavesdropping.

[0063] The ground station is mainly responsible for forwarding signaling and business data between the satellite and the base station, or between the satellite and the core network.

[0064] Air interface: refers to the wireless link between the terminal device and the base station.

[0065] Xn interface: represents the interface between satellite base stations, mainly used for signaling interaction such as switching.

[0066] NG interface: refers to the interface between the base station and the core network, or the interface between the ground station and the core network, or the interface between the satellite base station and the ground station (in this case, the interface is a wireless link), which mainly interacts with the core network's NAS and other signaling, as well as user service data.

[0067] In addition, as the number of communication satellites increases, there may be multiple layers of satellite deployment. Figure 2 In the specific example shown, satellite 1, satellite 2, satellite 3 and satellite 4 are deployed on the same layer, that is, the heights of satellite 1, satellite 2, satellite 3 and satellite 4 are basically the same; the height of satellite 5 is higher than that of other satellites, thus forming a multi-layer structure with other satellites.

[0068] The flowchart of the beam recovery method provided in the embodiment of the present application can be as follows: Figure 3 As shown, the following steps are included:

[0069] Step 301: The terminal device obtains a first parameter and a second parameter.

[0070] The first parameter is used to determine the first condition, the second parameter is used to determine the second condition, and the first condition and the second condition are used to perform beam switching.

[0071] In a possible implementation, the first parameter and the second parameter may be sent by the first satellite to the terminal device. The first satellite may carry the first parameter and the second parameter in the same message and send it to the terminal device, or the first satellite may send the first parameter and the second parameter to the terminal device respectively through different messages. The first satellite may send it to the terminal device through a system message, or the first satellite may send it to the terminal device through a dedicated message of the terminal device.

[0072] In a specific embodiment, the first satellite may carry the first parameter and the second parameter in beam failure recovery (BFR) information and send it to the terminal device. Furthermore, the BFR information may also include a candidate beam list and other parameters.

[0073] In another possible implementation, the first parameter and the second parameter may also be pre-configured in the terminal device. The terminal device may read the first parameter and the second parameter from a storage medium of the terminal device and determine the corresponding first condition and the second condition according to the first parameter and the second parameter.

[0074] Step 302: The first satellite sends a reference signal to the terminal device through a first beam.

[0075] Correspondingly, the terminal device receives the reference signal through the first beam pair.

[0076] The beam pair includes a transmission beam and a reception beam, such as a transmission beam for a first satellite to transmit a signal and a reception beam for a terminal device to receive a signal, or a transmission beam for a terminal device to transmit a signal and a reception beam for a first satellite to receive a signal. The beam pairs used for uplink transmission and downlink transmission may be the same or different; when different beam pairs are used for uplink and downlink transmission, the first beam pair is the beam pair for downlink transmission currently used by the terminal device and the first satellite.

[0077] Optionally, the above-mentioned reference signal may include a synchronization signal and a physical broadcast channel block (synchronization signal and PBCH block, SSB), or a channel state information reference signal (channel state information-reference signal, CSI-RS), or may also include SSB and CSI-RS.

[0078] Step 303: If the reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, the terminal device performs beam recovery with the first satellite through the second beam pair.

[0079] The second beam pair is different from the first beam pair. The beams used by the terminal device and the first satellite in the second beam pair may be different from the beams used by the terminal device and the first satellite in the first beam pair, or the terminal device may use different beams, or the first satellite may use different beams.

[0080] If the terminal device determines that the received reference signal meets the first condition but does not meet the second condition, it can be considered that the communication quality between the terminal device and the first satellite through the first beam pair is poor, and the beam pair can be switched to communicate with the first satellite, that is, the terminal device performs beam recovery with the first satellite. When the terminal device determines to switch the beam pair to communicate with the first satellite, the terminal device can send an access request to the first beam through the second beam pair, thereby realizing the beam pair switching with the first satellite; or, the terminal device can also train the beam pair in advance, so as to quickly realize the beam switching by wirelessly sending the access request.

[0081] Optionally, the terminal device can also obtain a first numerical threshold value. In this case, when the terminal device executes the above step 303, if the number of reference signals that meet the first condition and do not meet the second condition and are sent by the first satellite through the first beam pair within the first time and the number reaches the first numerical threshold value, the terminal device sends an access request to the first satellite through the second beam pair.

[0082] The first digital threshold value may be sent by the first satellite to the terminal device, or may be pre-configured in the terminal device. For example, the first satellite may carry the first digital threshold and the first parameter in the BFR information and send it to the terminal device. The above-mentioned first time may be pre-configured in the terminal device, or may be sent by the first satellite to the terminal device.

[0083] Step 304: If the reference signal satisfies a first condition determined according to the first parameter and satisfies a second condition determined according to the second parameter, the terminal device sends an access request to the second satellite.

[0084] If the terminal device determines that the received reference signal meets the first condition and the second condition, it can be considered that there is no communication condition between the terminal device and the first satellite. Even if it switches to other beam pairs for communication, it is difficult to meet the communication needs. Therefore, the terminal device can request to access the second satellite to meet the communication needs of the terminal device.

[0085] The second satellite and the first satellite are different communication satellites. Optionally, the second satellite may be a high-rise satellite, that is, the height of the second satellite is higher than the height of the first satellite. Alternatively, the second satellite may be a satellite of the same layer as the first satellite, that is, the height of the second satellite is substantially the same as the height of the first satellite. Figure 2 The satellite 1, satellite 2, satellite 3, and satellite 4 can be called satellites on the same layer.

[0086] Optionally, the terminal device can also obtain a second numerical threshold value. In this case, when the terminal device executes the above step 304, if the number of reference signals that meet the first condition and the second condition and are sent by the first satellite through the first beam pair received by the terminal device within the second time reaches the second numerical threshold value, the terminal device sends an access request to the second satellite.

[0087] The second digital threshold value may be sent to the terminal device by the first satellite, or may be pre-configured in the terminal device. For example, the first satellite may carry the second digital threshold value and the second parameter in the BFR information and send it to the terminal device. The above-mentioned second time may be pre-configured in the terminal device, or may be sent to the terminal device by the first satellite. The second digital threshold value may be equal to or different from the first digital threshold value, and the second time may be the same as or different from the first time.

[0088] In a possible implementation, the first parameter may be a first threshold value of a reference signal received power. Accordingly, the first condition determined according to the first parameter is that the received power of the reference signal by the terminal device is less than or equal to the first threshold value. For example, the first parameter includes a reference signal received power (RSRP) threshold value of an SSB. In step 302, the first satellite transmits an SSB. If the received power of the SSB by the terminal device is less than the RSRP threshold value of the SSB, it indicates that the first condition is satisfied. For another example, the first parameter includes an RSRP threshold value of an SSB and an RSRP threshold value of a CSI-RS. The terminal device receives an SSB and a CSI-RS transmitted by the first satellite. If the received power of the SSB by the terminal device is less than the RSRP threshold value of the SSB, and the received power of the CSI-RS is less than the RSRP threshold value of the CSI-RS, it indicates that the first condition is satisfied.

[0089] Regarding the second parameter, the embodiments of the present application provide multiple implementation methods, which are introduced below respectively.

[0090] Implementation method 1: the second parameter may be a second threshold value of the received power of the reference signal. Accordingly, the second condition determined according to the second parameter is that the received power of the reference signal by the terminal device is less than or equal to the second threshold value, wherein the second threshold value is less than the aforementioned first threshold value. For example, the first parameter includes a first RSRP threshold value of SSB, the second parameter includes a second RSRP threshold value of SSB, and the first satellite transmits SSB. If the received power of the SSB by the terminal device is greater than the first RSRP threshold value, then neither the first condition nor the second condition is satisfied. If the received power of the SSB by the terminal device is less than the first RSRP threshold value but greater than the second RSRP threshold value, then the first condition is satisfied but the second condition is not satisfied. If the received power of the SSB by the terminal device is less than the second RSRP threshold value, then both the first condition and the second condition are satisfied.

[0091] In a specific embodiment, the first parameter is a first threshold value of the reference signal received power, and the second parameter is a second threshold value of the reference signal received power. Then the beam recovery method provided in the embodiment of the present application can be as follows: Figure 4 shown.

[0092] Step 401: A first satellite sends BFR information, where the BFR information includes a first threshold value of a reference signal received power and a second threshold value of a reference signal received power.

[0093] The first threshold of the reference signal received power is the first parameter, and the second threshold of the reference signal received power is the second parameter. Correspondingly, the first condition is that the received power of the reference signal is less than or equal to the first threshold of the reference signal received power, and the second condition is that the received power of the reference signal is less than or equal to the second threshold of the reference signal received power.

[0094] The reference signal may include SSB and / or CSI-RS.

[0095] Optionally, the BFR information may include a candidate beam list, and may also include a first threshold number and a second threshold number.

[0096] Optionally, the BFR information may not include the first parameter and the second parameter, or the first satellite does not perform the above step 401, but pre-configures the first parameter and the second parameter in the terminal device.

[0097] Step 402: A first satellite sends a reference signal through a first beam pair.

[0098] The first beam pair is a beam pair used for downlink transmission between the current terminal device and the first satellite.

[0099] The reference signal sent by the first satellite in this step corresponds to the first parameter and the second parameter. For example, if the first parameter and the second parameter are respectively the first threshold of the received power of SSB and the second threshold of the received power of SSB, then the reference signal sent by the first satellite in step 402 is SSB; if the first parameter and the second parameter are respectively the first threshold of the received power of CSI-RS and the second threshold of the received power of CSI-RS, then the reference signal sent by the first satellite in step 402 is CSI-RS.

[0100] Step 403: The terminal device determines whether the received power of the reference signal is less than or equal to the first threshold of the received power of the reference signal.

[0101] The terminal device determines whether the received reference signal satisfies a first condition, that is, whether the received power of the reference signal is less than or equal to a first threshold of the received power of the reference signal.

[0102] If not, it is considered that the currently used first beam pair can meet the communication requirements of the terminal device, and there is no need to switch the beam pair. It should be understood that step 402 and step 403 can be repeatedly performed until the reference signal received by the terminal device meets the first condition.

[0103] If so, it is considered that the first beam pair currently in use cannot meet the communication requirements of the terminal device and the beam pair needs to be switched, and step 404 is continued.

[0104] When the terminal device also obtains the first numerical threshold value, the terminal device then specifically determines in the above step 403 whether the number of reference signals with receiving power less than or equal to the first threshold value received within the first time reaches the first numerical threshold value.

[0105] Step 404: The terminal device determines whether the received power of the reference signal is less than or equal to the second threshold of the received power of the reference signal.

[0106] The terminal device determines whether the received reference signal satisfies the second condition, that is, whether the received power of the reference signal is less than or equal to the second threshold of the received power of the reference signal.

[0107] If not, it is considered that the terminal device can try to switch to other beams of the first satellite for communication. Although the currently used first beam pair cannot meet the communication needs of the terminal device, other beam pairs between the first satellite and the terminal device may be able to meet the communication needs of the terminal device, and step 405 is executed.

[0108] If so, it is considered that the beam pairs between the terminal device and the first satellite are unable to meet the communication needs of the terminal device, and it is necessary to switch to other satellites for communication, and the terminal device executes step 406.

[0109] When the terminal device also obtains the second digital threshold value, the terminal device then specifically determines in the above step 404 whether the number of reference signals with receiving power less than or equal to the second threshold value received within the second time reaches the second digital threshold value.

[0110] Step 405: The terminal device performs beam recovery with the first satellite through the second beam pair.

[0111] Optionally, the terminal device sends an access request to the first satellite through the second beam pair, thereby communicating with the first satellite through the second beam pair, and not using the first beam pair that is blocked and has poor communication quality for communication, thereby improving the communication quality of the terminal device and meeting the communication needs of the terminal device. Alternatively, the terminal device may also train the beam pair in advance, so as to wirelessly send an access request to quickly implement beam switching.

[0112] Step 406: The terminal device sends an access request to the second satellite.

[0113] The terminal device sends an access request to the second satellite, thereby enabling the terminal device to access the core network through the second satellite. In the case of obstruction or poor communication quality, the terminal device does not communicate with the first satellite, thereby restoring the communication of the terminal device, improving the communication quality of the terminal device, and meeting the communication needs of the terminal device.

[0114] Optionally, the second satellite is a high-level satellite of the first satellite.

[0115] Implementation method 2, the second parameter is the first time window, and accordingly, the second condition determined according to the second parameter is that the terminal device receives the reference signal within the first time window. Among them, the first time window is a time range of poor communication quality determined based on the positional relationship between the first satellite and the terminal device. That is to say, if the terminal device communicates with the first satellite within the first time window, the communication quality is difficult to meet the communication needs of the terminal device. For example, when the terminal device is an IoT device with a relatively fixed position, according to the ephemeris of the first satellite and the position information of the terminal device, it can be determined that within the time range of t1 to t2, there may be an obstruction between the terminal device and the first satellite. For example, an aircraft with an altitude lower than the first satellite will pass between the terminal device and the first satellite within the time period of t1 to t2, and then the time period of t1 to t2 is the above-mentioned first time window.

[0116] Optionally, the first time window may include a start time and an end time, such as t1 and t2 above; or, the first time window may include a start time and a time length of the first time window, such as t1 and l, where l represents the time length of the first time window. In the above two cases, the first time window may be pre-configured in the terminal device, or may be sent to the terminal device by the first satellite.

[0117] Alternatively, the first time window may also include a start time offset and an end time offset, or include a start time offset and the length of the first time window. The start time offset represents the difference between the start time of the first time window and the first reference time, and the end time offset represents the difference between the end time of the first time window and the first reference time. The first reference time may be the time when the first satellite sends the first time window information (i.e., the second reference), or the first reference time may also be notified to the terminal device by the first satellite, or the first reference time may also be another pre-agreed time. For example, the first satellite determines that the first time window is (t1, t2), the first satellite sends the first time window information to the terminal device at time t0, and the first reference time is time t0, then the first satellite may send the start time offset ΔT1=t1-t0 and the end time offset ΔT2=t2-t0 to the terminal device.

[0118] In a specific embodiment, the first parameter is a first threshold of the reference signal received power, and the second parameter is a first time window. Then the beam recovery method provided in the embodiment of the present application can be as follows: Figure 5 shown.

[0119] Step 501: A first satellite sends BFR information, where the BFR information includes a first threshold of a reference signal received power and a first time window.

[0120] The first threshold of the reference signal received power is the first parameter, and the first time window is the second parameter. Correspondingly, the first condition is that the received power of the reference signal is less than or equal to the first threshold of the reference signal received power, and the second condition is that the reference signal reception time is within the first time window.

[0121] The first time window may specifically include a start time t1 and an end time t2, or include a start time t1 and a time window length l, or include a start time offset ΔT1 and an end time offset ΔT2, or include a start time offset ΔT1 and a time window length l. Taking the first reference time as the time when the first satellite sends the BFR information as an example, if the first time window sent by the first satellite includes a start time offset ΔT1 and an end time offset ΔT2, or a start time offset ΔT1 and a time window length l, then the terminal device may determine the first time window according to the timestamp, the start time offset ΔT1 and the end time offset ΔT2 (or the time window length l) in the BFR information, or the terminal device may also determine the first time window according to the time when the BFR information is received, the start time offset ΔT1 and the end time offset ΔT2 (or the time window length l).

[0122] The reference signal may include SSB and / or CSI-RS.

[0123] Optionally, the BFR information may include a candidate beam list, and may also include a first threshold number and a second threshold number.

[0124] Optionally, the BFR information may not include the first parameter and the second parameter, or the first satellite does not perform the above step 501, but pre-configures the first parameter and the second parameter in the terminal device.

[0125] Step 502: A first satellite sends a reference signal through a first beam pair.

[0126] The first beam pair is a beam pair used for downlink transmission between the current terminal device and the first satellite.

[0127] The reference signal sent by the first satellite in this step corresponds to the first parameter. For example, if the first parameter is the first threshold of the received power of SSB, then the reference signal sent by the first satellite in step 502 is SSB; if the first parameter is the first threshold of the received power of CSI-RS, then the reference signal sent by the first satellite in step 502 is CSI-RS.

[0128] Step 503: The terminal device determines whether the received power of the reference signal is less than or equal to the first threshold of the received power of the reference signal.

[0129] The terminal device determines whether the received reference signal satisfies a first condition, that is, whether the received power of the reference signal is less than or equal to a first threshold of the received power of the reference signal.

[0130] If not, it is considered that the currently used first beam pair can meet the communication requirements of the terminal device, and there is no need to switch the beam pair. Step 502 and step 503 may be repeatedly performed until the reference signal received by the terminal device meets the first condition.

[0131] If so, it is considered that the first beam pair currently in use cannot meet the communication requirements of the terminal device and the beam pair needs to be switched, and step 504 is continued.

[0132] When the terminal device also obtains the first numerical threshold value, the terminal device then specifically determines in the above step 503 whether the number of reference signals with receiving power less than or equal to the first threshold value received within the first time reaches the first numerical threshold value.

[0133] Step 504: The terminal device determines whether the time of receiving the reference signal is within the first time window.

[0134] If it is determined that the time of receiving the reference signal is not within the first time window, it is considered that the terminal device can try to switch to other beams of the first satellite for communication. Although the currently used first beam pair cannot meet the communication needs of the terminal device, other beam pairs between the first satellite and the terminal device may be able to meet the communication needs of the terminal device, and then step 505 is executed.

[0135] If it is determined that the time for receiving the reference signal is within the first time window, it is considered that there is an obstruction between the terminal device and the first satellite, and the beam pair between the terminal device and the first satellite cannot meet the communication needs of the terminal device, and it is necessary to switch to other satellites for communication, then the terminal device executes step 506.

[0136] When the terminal device also obtains the second numerical threshold value, the terminal device then specifically determines in the above step 504 whether the number of reference signals that meet the first condition and the second condition received within the second time reaches the second numerical threshold value, wherein the second time is the above first time window.

[0137] Step 505: The terminal device performs beam recovery with the first satellite through the second beam pair.

[0138] Optionally, the terminal device sends an access request to the first satellite through the second beam pair, thereby communicating with the first satellite through the second beam pair, and not using the first beam pair that is blocked and has poor communication quality for communication, thereby improving the communication quality of the terminal device and meeting the communication needs of the terminal device. Alternatively, the terminal device may also train the beam pair in advance, so as to wirelessly send an access request to quickly implement beam switching.

[0139] Step 506: The terminal device sends an access request to the second satellite.

[0140] The terminal device sends an access request to the second satellite, thereby enabling the terminal device to access the core network through the second satellite. In the case of obstruction or poor communication quality, the terminal device does not communicate with the first satellite, thereby restoring the communication of the terminal device, improving the communication quality of the terminal device, and meeting the communication needs of the terminal device.

[0141] Optionally, the second satellite is a high-level satellite of the first satellite.

[0142] In the third implementation method, the second parameter may also be the range of elevation angles formed by the terminal device and the first satellite; correspondingly, the second condition determined according to the second parameter is that the elevation angle when the terminal device receives the reference signal is within the above-mentioned range of elevation angles. Among them, the range of elevation angles is the range of elevation angles with poor communication quality determined based on the positional relationship between the first satellite and the terminal device. That is to say, if the terminal device communicates with the first satellite within the elevation angle range, the communication quality is difficult to meet the communication needs of the terminal device. For example, when the terminal device is an Internet of Things device with a relatively fixed position, based on the ephemeris of the first satellite and the position information of the terminal device, it can be determined that within the range of elevation angles α1 to α2, there may be obstruction between the terminal device and the first satellite. For example, when an aircraft with a height lower than the first satellite passes between the terminal device and the first satellite, the elevation angle between the terminal and the first satellite is set to α1 to α2. Figure 6 shown.

[0143] Optionally, the range of elevation angles may include a starting angle of elevation and an ending angle of elevation, such as α1 and α2 above; or, the range of elevation angles may also include a starting angle of elevation and an elevation span, such as α1 and k, where k represents the elevation span, i.e., α2-α1. In the above two cases, the range of elevation angles may be pre-configured in the terminal device, or may be sent to the terminal device by the first satellite.

[0144] Alternatively, the range of elevation angles may also include a starting angle offset and an ending angle offset, or a starting angle offset and an elevation span. The starting angle offset represents the offset between the starting angle of the elevation range and the first reference elevation angle, and the ending angle offset represents the offset between the ending angle of the elevation range and the first reference elevation angle. The first reference elevation angle may be the elevation angle when the first satellite sends the first time window information (i.e., the second reference), or the first reference elevation angle may also be notified to the terminal device by the first satellite, or the first reference elevation angle may also be another pre-agreed elevation angle. For example, the first satellite determines the elevation range to be (α1, α2), and the first satellite sends the information of the elevation range to the terminal device when the elevation angle is α0, and the first reference elevation angle is α0. Then the first satellite may send the starting angle offset Δα1=α1-α0 and the ending angle offset Δα2=α2-α0 to the terminal device, or send the starting angle offset Δα1=α1-α0 and the elevation span k=α2-α1 to the terminal device.

[0145] In a specific embodiment, the first parameter is a first threshold of the reference signal received power, and the second parameter is an elevation angle range. Then the beam recovery method provided in the embodiment of the present application can be as follows: Figure 7 shown.

[0146] Step 701: A first satellite sends BFR information, where the BFR information includes a first threshold of a reference signal received power and an elevation angle range.

[0147] The first threshold of the reference signal receiving power is the above-mentioned first parameter, and the elevation angle range is the above-mentioned second parameter. Correspondingly, the first condition is that the reference signal receiving power is less than or equal to the first threshold of the reference signal receiving power, and the second condition is that the elevation angle when the terminal device receives the reference signal is within the above-mentioned elevation angle range.

[0148] The elevation angle range may specifically include a starting angle α1 and an ending angle α2, or include a starting angle α1 and an elevation angle span k, or include a starting angle offset Δα1 and an ending angle offset Δα2, or include a starting angle offset Δα1 and an elevation angle span k. Taking the first reference elevation angle as an elevation angle when the first satellite sends BFR information as an example, if the elevation angle range sent by the first satellite includes a starting angle offset Δα1 and an ending angle offset Δα2 (or an elevation angle span k), then the terminal device may determine the elevation angle range according to the elevation angle of the terminal device when receiving the BFR information, the starting angle offset Δα1, and the ending angle offset Δα2 (or the elevation angle span k).

[0149] The reference signal may include SSB and / or CSI-RS.

[0150] Optionally, the BFR information may include a candidate beam list, and may also include a first threshold number and a second threshold number.

[0151] Optionally, the BFR information may not include the first parameter and the second parameter, or the first satellite does not perform the above step 701, but pre-configures the first parameter and the second parameter in the terminal device.

[0152] Step 702: A first satellite sends a reference signal through a first beam pair.

[0153] The first beam pair is a beam pair used for downlink transmission between the current terminal device and the first satellite.

[0154] The reference signal sent by the first satellite in this step corresponds to the first parameter. For example, if the first parameter is the first threshold of the received power of SSB, then the reference signal sent by the first satellite in step 702 is SSB; if the first parameter is the first threshold of the received power of CSI-RS, then the reference signal sent by the first satellite in step 702 is CSI-RS.

[0155] Step 703: The terminal device determines whether the received power of the reference signal is less than or equal to the first threshold of the received power of the reference signal.

[0156] The terminal device determines whether the received reference signal satisfies a first condition, that is, whether the received power of the reference signal is less than or equal to a first threshold of the received power of the reference signal.

[0157] If not, it is considered that the currently used first beam pair can meet the communication requirements of the terminal device, and there is no need to switch the beam pair. Step 702 and step 703 may be repeatedly performed until the reference signal received by the terminal device meets the first condition.

[0158] If so, it is considered that the first beam pair currently in use cannot meet the communication requirements of the terminal device and the beam pair needs to be switched, and step 704 is continued.

[0159] When the terminal device also obtains the first numerical threshold value, the terminal device then specifically determines in the above step 703 whether the number of reference signals with receiving power less than or equal to the first threshold value received within the first time reaches the first numerical threshold value.

[0160] Step 704: The terminal device determines whether the elevation angle when receiving the reference signal is within the elevation angle range.

[0161] If it is determined that the elevation angle when receiving the reference signal is not within the elevation angle, it is considered that the terminal device can try to switch to other beams of the first satellite for communication. Although the currently used first beam pair cannot meet the communication needs of the terminal device, other beam pairs between the first satellite and the terminal device may be able to meet the communication needs of the terminal device, and then step 705 is executed.

[0162] If it is determined that the elevation angle when receiving the reference signal is within the elevation angle range, it is considered that there is an obstruction between the terminal device and the first satellite, and the beam pair between the terminal device and the first satellite is difficult to meet the communication needs of the terminal device, and it is necessary to switch to other satellites for communication, then the terminal device executes step 706.

[0163] When the terminal device also obtains the second digital threshold value, the terminal device then specifically determines in the above step 704 whether the number of reference signals that meet the first condition received within the second time and within the elevation angle range reaches the second digital threshold value, wherein the second time may be a time period corresponding to the elevation angle range, wherein the time period corresponding to the elevation angle range is the length of time that the elevation angle determined based on the satellite motion trajectory and the terminal position continues within the elevation angle range, or the second time may also be shorter than the time period corresponding to the elevation angle range.

[0164] Step 705: The terminal device performs beam recovery with the first satellite through the second beam pair.

[0165] Optionally, the terminal device sends an access request to the first satellite through the second beam pair, thereby communicating with the first satellite through the second beam pair, and not using the first beam pair that is blocked and has poor communication quality for communication, thereby improving the communication quality of the terminal device and meeting the communication needs of the terminal device. Alternatively, the terminal device may also train the beam pair in advance, so as to wirelessly send an access request to quickly implement beam switching.

[0166] Step 706: The terminal device sends an access request to the second satellite.

[0167] The terminal device sends an access request to the second satellite, thereby enabling the terminal device to access the core network through the second satellite. In the case of obstruction or poor communication quality, the terminal device does not communicate with the first satellite, thereby restoring the communication of the terminal device, improving the communication quality of the terminal device, and meeting the communication needs of the terminal device.

[0168] Optionally, the second satellite is a high-level satellite of the first satellite.

[0169] Implementation method 4, the second parameter can also be the first timer start threshold value and the first timer timing duration, the threshold value is the elevation angle threshold value between the terminal device and the first satellite; correspondingly, according to the second condition determined by the second parameter, when the terminal device receives the reference signal, the first timer is running. Among them, the first timer is determined based on the elevation angle range and time length of the poor communication quality determined based on the positional relationship between the first satellite and the terminal device, that is, if the terminal device communicates with the first satellite when the first timer is running, then the communication quality is difficult to meet the communication needs of the terminal device. For example, when the terminal device is an Internet of Things device with a relatively fixed position, according to the ephemeris of the first satellite and the position information of the terminal device, it can be determined that starting from the elevation angle α1, there may be an obstruction between the terminal device and the first satellite, such as an aircraft with a height lower than the first satellite passing between the terminal device and the first satellite, and continuing for a time length of T1, then the start threshold value of the first timer is the elevation angle α1, and the timing duration is T1.

[0170] After the terminal device obtains the second parameter, the first timer is started when the elevation angle formed by the terminal device and the first satellite reaches α1, and the first timer is closed when the first timer reaches the timing duration T1.

[0171] In a specific embodiment, the first parameter is the first threshold of the reference signal receiving power, and the second parameter is the first timer start threshold and the timing duration of the first timer. Then the beam recovery method provided in the embodiment of the present application can be as follows: Figure 8 shown.

[0172] Step 801: A first satellite sends BFR information, where the BFR information includes a first threshold of a reference signal received power, a first timer start threshold, and a timing duration of the first timer.

[0173] The first threshold of the received power of the reference signal is the first parameter, and the first timer start threshold and the timing duration of the first timer are the second parameters. Correspondingly, the first condition is that the received power of the reference signal is less than or equal to the first threshold of the received power of the reference signal, and the second condition is that the first timer is running when the terminal device receives the reference signal.

[0174] The reference signal may include SSB and / or CSI-RS.

[0175] Optionally, the BFR information may include a candidate beam list, and may also include a first threshold number and a second threshold number.

[0176] Optionally, the BFR information may not include the first parameter and the second parameter, or the first satellite does not perform the above step 801, but pre-configures the first parameter and the second parameter in the terminal device.

[0177] Step 802: A first satellite sends a reference signal through a first beam pair.

[0178] The first beam pair is a beam pair used for downlink transmission between the current terminal device and the first satellite.

[0179] The reference signal sent by the first satellite in this step corresponds to the first parameter. For example, if the first parameter is the first threshold of the received power of SSB, then the reference signal sent by the first satellite in step 802 is SSB; if the first parameter is the first threshold of the received power of CSI-RS, then the reference signal sent by the first satellite in step 802 is CSI-RS.

[0180] Step 803: The terminal device determines whether the received power of the reference signal is less than or equal to the first threshold of the received power of the reference signal.

[0181] The terminal device determines whether the received reference signal satisfies a first condition, that is, whether the received power of the reference signal is less than or equal to a first threshold of the received power of the reference signal.

[0182] If not, it is considered that the currently used first beam pair can meet the communication requirements of the terminal device, and there is no need to switch the beam pair. Step 802 and step 803 may be repeatedly performed until the reference signal received by the terminal device meets the first condition.

[0183] If so, it is considered that the first beam pair currently in use cannot meet the communication requirements of the terminal device and the beam pair needs to be switched, and step 804 is continued.

[0184] When the terminal device also obtains the first numerical threshold value, the terminal device then specifically determines in the above step 803 whether the number of reference signals with receiving power less than or equal to the first threshold value received within the first time reaches the first numerical threshold value.

[0185] Step 804: The terminal device determines whether the first timer is running when receiving the reference signal.

[0186] If it is determined that the first timer is not running when the reference signal is received, it is considered that the terminal device can attempt to switch to other beams of the first satellite for communication. Although the currently used first beam pair cannot meet the communication needs of the terminal device, other beam pairs between the first satellite and the first satellite may be able to meet the communication needs of the terminal device, and then step 805 is executed.

[0187] If it is determined that the first timer is running when receiving the reference signal, it is considered that there is an obstruction between the terminal device and the first satellite, and the beam pair between the terminal device and the first satellite cannot meet the communication needs of the terminal device, and it is necessary to switch to other satellites for communication, then the terminal device executes step 806.

[0188] When the terminal device also obtains the second digital threshold value, the terminal device then specifically determines in the above step 804 whether the number of reference signals that meet the first condition received within the second time and during the operation of the first timer reaches the second digital threshold value, wherein the second time may be the timing duration of the first timer, or the second time may also be shorter than the timing duration of the first timer.

[0189] Step 805: The terminal device performs beam recovery with the first satellite through the second beam pair.

[0190] Optionally, the terminal device sends an access request to the first satellite through the second beam pair, thereby communicating with the first satellite through the second beam pair, and not using the first beam pair that is blocked and has poor communication quality for communication, thereby improving the communication quality of the terminal device and meeting the communication needs of the terminal device. Alternatively, the terminal device may also train the beam pair in advance, so as to wirelessly send an access request to quickly implement beam switching.

[0191] Step 806: The terminal device sends an access request to the second satellite.

[0192] The terminal device sends an access request to the second satellite, thereby enabling the terminal device to access the core network through the second satellite. In the case of obstruction or poor communication quality, the terminal device does not communicate with the first satellite, thereby restoring the communication of the terminal device, improving the communication quality of the terminal device, and meeting the communication needs of the terminal device.

[0193] Optionally, the second satellite is a high-level satellite of the first satellite.

[0194] In the beam recovery method provided in the above embodiment of the present application, it is possible to quickly perform beam recovery in the event of a beam failure in a satellite communication system. Specifically, the terminal device can quickly select a beam recovery strategy based on a first condition determined by a first parameter and a second condition determined by a second parameter, and whether to choose to switch beam pairs on the same satellite or to switch to other satellites for communication, so as to avoid sending access requests to the currently serving satellite all the time, but in fact, there is an obstruction between the terminal device and the currently serving satellite and communication is impossible, thereby increasing the power consumption of the terminal device and interfering with other uplink signals.

[0195] Fig. 9Schematic diagram of a communication device provided according to an embodiment of the present application. The communication device includes a processing module 901 and a transceiver module 902. The processing module 901 is used to implement data processing by the communication device. The transceiver module 902 is used to receive content between the communication device and other units or network elements, or to send content between the communication device and other units or network elements. It should be understood that the processing module 901 in the embodiment of the present application can be implemented by a processor or a processor-related circuit component (or, referred to as a processing circuit), and the transceiver module 902 can be implemented by a receiver / transmitter or a receiver / transmitter-related circuit component.

[0196] Exemplarily, the communication device may be a communication device, or may be a chip used in the communication device, or other combined devices, components, etc. having the functions of the above communication device.

[0197] When the communication device is a terminal device, the processing module 901 obtains a first parameter and a second parameter; a reference signal is received through a first beam pair through a receiving module 902; if the reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, an access request is sent to the first satellite through a second beam pair through the receiving module 902; if the reference signal satisfies the first condition and satisfies the second condition, an access request is sent to the second satellite through the receiving module 902.

[0198] In addition, the above modules can also be used to support Figures 3 to 8 The beneficial effects of other processes executed by the terminal device in the illustrated embodiment can be referred to the previous description and will not be repeated here.

[0199] When the communication device is the first satellite, the processing module 901 sends a first parameter and a second parameter to the terminal device through the receiving module 902, wherein the first parameter is used to determine a first condition, and the second parameter is used to determine a second condition; the receiving module 902 sends a reference signal to the terminal device through the first beam pair, and the reference signal, the first condition and the second condition are used by the terminal device to perform satellite beam switching.

[0200] In addition, the above modules can also be used to support Figures 3 to 8 The other processes performed by the first satellite in the illustrated embodiment and the beneficial effects thereof can be referred to the previous description, which will not be repeated here.

[0201] Fig.10This is a schematic diagram of another communication device provided according to an embodiment of the present application, the communication device includes: a processor 1001, a communication interface 1002, and further may include a memory 1003 and a bus 1004. The processor 1001, the communication interface 1002 and the memory 1003 may be interconnected via a bus 1004; the bus 1004 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The above-mentioned bus 1004 may be divided into an address bus, a data bus and a control bus, etc. For ease of representation, Fig.10 The fact that only one line is used in the diagram does not mean that there is only one bus or only one type of bus.

[0202] The processor 1001 may be a central processing unit (CPU), a network processor (NP) or a combination of a CPU and a NP. The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof. The memory 1003 may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM) or a flash memory. Volatile memory may be random access memory (RAM), which acts as external cache memory.

[0203] The processor 1001 is used to implement data processing operations of the communication device, and the communication interface 1002 is used to implement receiving operations and sending operations of the communication device.

[0204] When the communication device is a terminal device, the processor 1001 obtains a first parameter and a second parameter; receives a reference signal through a first beam pair through the communication interface 1002; if the reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, an access request is sent to the first satellite through the second beam pair through the communication interface 1002; if the reference signal satisfies the first condition and satisfies the second condition through the communication interface 1002, the terminal device sends an access request to the second satellite.

[0205] In addition, the above modules can also be used to support Figures 3 to 8 The beneficial effects of other processes executed by the terminal device in the illustrated embodiment can be referred to the previous description and will not be repeated here.

[0206] When the communication device is the first satellite, the processor 1001 sends a first parameter and a second parameter to the terminal device through the communication interface 1002, wherein the first parameter is used to determine a first condition, and the second parameter is used to determine a second condition; a reference signal is sent to the terminal device through the first beam pair through the communication interface 1002, and the reference signal, the first condition and the second condition are used for the terminal device to perform satellite beam switching.

[0207] In addition, the above modules can also be used to support Figures 3 to 8 The other processes performed by the first satellite in the illustrated embodiment and the beneficial effects thereof can be referred to the previous description, which will not be repeated here.

[0208] Based on the same technical concept, an embodiment of the present application also provides a communication system, including a terminal device and at least one communication satellite (such as the first satellite and the second satellite in the aforementioned method embodiment).

[0209] Based on the same technical concept, an embodiment of the present application also provides a computer-readable storage medium, in which computer-readable instructions are stored. When the computer-readable instructions are executed on a computer, the method described in any possible implementation method described above is executed.

[0210] An embodiment of the present application provides a computer program product including instructions, which enables the above method embodiment to be executed when the computer program product is run on a computer.

[0211] An embodiment of the present application provides a chip, including: a processor, the processor is coupled to a memory, the memory is used to store instructions, when the instructions are executed by the processor, the chip implements the method steps executed by any of the above nodes.

[0212] In the description of the embodiments of the present application, "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The multiple involved in the present application refers to two or more.

[0213] In addition, it should be understood that, in the description of the present application, words such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. References to "one embodiment" or "some embodiments" described in this specification mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0214] The method steps in the embodiments of the present application can be implemented by hardware, or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. Of course, the processor and the storage medium can also be present in a base station or a terminal as discrete components.

[0215] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0216] In the various embodiments of the present application, unless otherwise specified or provided in a logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0217] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

1. A beam recovery method, characterized in that: The method comprises: The terminal device obtains the first parameter and the second parameter; The terminal device receives a reference signal through a first beam pair; If the reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, the terminal device performs beam recovery with the first satellite through a second beam pair; If the reference signal satisfies the first condition and the second condition, the terminal device sends an access request to the second satellite.

2. The method according to claim 1, characterized in that The first parameter is a first threshold value, The first condition is that the received power of the reference signal is less than or equal to the first threshold.

3. The method according to claim 2, characterized in that The second parameter is a second threshold of the reference signal received power, and the first threshold is greater than the second threshold; The second condition is that the received power of the reference signal is less than or equal to the second threshold.

4. The method according to claim 2 or 3, characterized in that: The reference signal includes a synchronization signal block SSB or a channel state information reference signal CSI-RS.

5. The method according to claim 1 or 2, characterized in that: The second parameter is a first time window; The second condition is that the reference signal reception time is within the first time window.

6. The method according to claim 5, characterized in that The first time window includes a start time and an end time, or includes a start time and a time length of the first time window, or includes a start time offset and an end time offset; The start time offset represents the difference between the start time of the first time window and the first reference time, and the end time offset represents the difference between the end time of the first time window and the first reference time.

7. The method according to claim 1 or 2, characterized in that: The second parameter is a range of elevation angles formed by the terminal device and the first satellite; The second condition is that the elevation angle formed by the terminal device and the first satellite when the reference signal is received is within the range.

8. The method according to claim 7, characterized in that The range includes: a starting angle and an ending angle of the elevation angle, or a starting angle offset and an ending angle offset; The starting angle offset represents an offset between a starting angle of the range and a first reference elevation angle, and the ending angle offset represents an offset between an ending angle of the range and the first reference elevation angle.

9. The method according to claim 1 or 2, characterized in that: The second parameter is a first timer start threshold and a timing duration of the first timer, and the threshold is an elevation angle threshold between the terminal device and the first satellite; The second condition is that the first timer is running when the terminal device receives the reference signal.

10. The method according to any one of claims 1 to 9, characterized in that: The terminal device acquires the first parameter and the second parameter, including: The terminal device receives beam failure recovery BFR information sent by the first satellite, where the BFR information includes the first parameter and the second parameter.

11. The method according to any one of claims 1 to 10, characterized in that: The altitude of the second satellite is higher than the altitude of the first satellite.

12. The method according to any one of claims 1 to 11, characterized in that: The method further comprises: The terminal device obtains a first digital threshold; If the reference signal satisfies a first condition determined according to the first parameter and does not satisfy a second condition determined according to the second parameter, the terminal device performs beam recovery with the first satellite through a second beam pair, including: If the number of the reference signals that meet the first condition and do not meet the second condition received by the terminal device within the first time reaches the first number threshold, the terminal device performs beam recovery with the first satellite through a second beam pair.

13. The method according to any one of claims 1 to 12, characterized in that: The method further comprises: The terminal device obtains a second digital threshold; The reference signal satisfies the first condition and the second condition, and the terminal device sends an access request to the second satellite, including: If the number of the reference signals satisfying the first condition and the second condition received by the terminal device within the second time reaches the second number threshold, the terminal device sends an access request to the second satellite.

14. A beam recovery method, characterized in that: The method comprises: The first satellite sends a first parameter and a second parameter to the terminal device, where the first parameter is used to determine the first condition, and the second parameter is used to determine the second condition; The first satellite sends a reference signal to the terminal device through a first beam pair, and the reference signal, the first condition and the second condition are used by the terminal device to perform satellite beam recovery.

15. The method according to claim 14, characterized in that The method further comprises: If the reference signal received by the terminal device meets the first condition but does not meet the second condition, the first satellite performs beam recovery with the terminal device through a second beam pair.

16. The method according to claim 14 or 15, characterized in that The first parameter is a first threshold; The first condition is that the received power of the reference signal is less than or equal to the first threshold.

17. The method according to claim 16, characterized in that The second parameter is a second threshold of the reference signal received power, and the first threshold is greater than the second threshold; The second condition is that the received power of the reference signal is less than or equal to the second threshold.

18. The method according to claim 16 or 17, characterized in that The reference signal includes a synchronization signal block SSB or a channel state information reference signal CSI-RS.

19. The method according to any one of claims 14 to 16, characterized in that: The second parameter is a first time window; The second condition is that the reference signal reception time is within the first time window.

20. The method according to claim 19, characterized in that The first time window includes a start time and an end time, or includes a start time and a time length of the first time window, or includes a start time offset and an end time offset; The start time offset represents the difference between the start time of the first time window and the first reference time, and the end time offset represents the difference between the end time of the first time window and the first reference time.

21. The method according to any one of claims 14 to 16, characterized in that: The second parameter is a range of elevation angles formed by the terminal device and the first satellite; The second condition is that the elevation angle formed by the terminal device and the first satellite when the reference signal is received is within the range.

22. The method according to claim 21, characterized in that The range includes: a starting angle and an ending angle of the elevation angle, or a starting angle offset and an ending angle offset; The starting angle offset represents an offset between a starting angle of the range and a first reference elevation angle, and the ending angle offset represents an offset between an ending angle of the range and the first reference elevation angle.

23. The method according to any one of claims 14 to 16, characterized in that: The second parameter is a first timer start threshold and a timing duration of the first timer, and the threshold is an elevation angle threshold between the terminal device and the first satellite; The second condition is that the first timer is running when the terminal device receives the reference signal.

24. The method according to any one of claims 14 to 23, characterized in that: The first satellite sends a first parameter and a second parameter, including: The first satellite sends beam failure recovery BFR information, where the BFR information includes the first parameter and the second parameter.

25. The method according to any one of claims 14 to 24, characterized in that: The altitude of the second satellite is higher than the altitude of the first satellite.

26. The method according to claim 15, characterized in that The method further comprises: The first satellite sends a first digital threshold to the terminal device; The terminal device receiving the reference signal satisfies the first condition but does not satisfy the second condition, including: The number of reference signals that meet the first condition and do not meet the second condition and are sent by the first satellite through the first beam pair and received by the terminal device within the first time reaches the first number threshold.

27. The method according to claim 15, characterized in that The method further comprises: The first satellite sends a second digital threshold to the terminal device; The terminal device receiving the reference signal satisfies the first condition and the second condition, including: The number of reference signals that meet the first condition and the second condition and are sent by the first satellite through the first beam pair and received by the terminal device within the second time reaches the second number threshold.

28. A communication device, characterized in that: include: A processor, wherein the processor is coupled to a memory, wherein the memory is used to store programs or instructions, and when the programs or instructions are executed by the processor, the device executes the method according to any one of claims 1 to 13.

29. A communication device, characterized in that: include: A processor, wherein the processor is coupled to a memory, wherein the memory is used to store programs or instructions, and when the programs or instructions are executed by the processor, the device executes the method according to any one of claims 14 to 27.

30. A communication system, characterized in that: Comprising a communication device as claimed in claim 28 and at least one communication device as claimed in claim 29.

31. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and when the instructions are executed on a computer, the computer is enabled to execute the method according to any one of claims 1 to 27.

32. A computer program product comprising instructions, characterized in that When the instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 27.

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