Path loss determination method and related device

Abstract

Embodiments of the present application relate to the field of communications, and provide a path loss determination method and a related device. In the method, on the basis of downlink path loss or uplink path loss between a terminal and a first satellite base station at a first moment, uplink path loss between the terminal and a second satellite base station at a second moment can be determined, wherein the first moment is earlier than the second moment. In this way, path loss estimation processing between the second satellite base station and the terminal is avoided. The second satellite base station does not need to indicate reference signal power and a reference signal ID to the terminal, effectively reducing communication overhead required for determining the uplink path loss between the second satellite base station and the terminal.

Description

Path loss determination method and related device

[0001] The present application claims priority to the Chinese patent application No. 202410841508.8, filed on June 26, 2024, and entitled "A path loss determination method and related device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of communication, in particular to a path loss determination method and related device. BACKGROUND

[0003] In a non-terrestrial network (NTN) system, as the satellite moves, the beam is updated frequently, so the path loss (PL) will continue to change. The NTN needs to frequently indicate the reference signal power related to the user equipment (UE) path loss estimation and the unique identity document (ID) of the reference signal. The UE side needs to frequently perform path loss estimation processing, which has huge communication overhead. SUMMARY

[0004] The present application provides a path loss determination method and related device, which can reduce the communication overhead required by the satellite base station and the terminal when determining the path loss.

[0005] In a first aspect, a path loss determination method is provided, which can be executed by a communication device or a chip in the communication device. The communication device can be a terminal or the like.

[0006] The path loss determination method includes the following steps: obtaining a first path loss, which is the downlink path loss or uplink path loss between the terminal and a first satellite base station at a first time; and determining a second path loss based on the first path loss, which is the uplink path loss between the terminal and a second satellite base station at a second time, the first time being earlier than the second time.

[0007] Wherein, the downlink refers to the link of the satellite base station transmitting to the terminal. The uplink refers to the link of the terminal transmitting to the satellite base station.

[0008] In the scheme, the uplink path loss between the terminal and the second satellite base station at the second time can be determined based on the downlink path loss or the uplink path loss between the terminal and the first satellite base station at the first time, so that the path loss estimation processing of the second satellite base station and the terminal can be avoided, the second satellite base station does not need to indicate the reference signal power and the ID of the reference signal to the terminal, and the communication overhead required by the second satellite base station and the terminal when determining the uplink path loss can be effectively reduced.

[0009] In a possible implementation of the first aspect, the first path loss is the downlink path loss between the terminal and the first satellite base station at the first time, and the method further includes the following steps: receiving indication information sent by the first satellite base station, the indication information being used to indicate that the first path loss is enabled as the downlink path loss between the terminal and the second satellite base station.

[0010] The second path loss is determined based on the first path loss, and specifically includes the following steps: determining the second path loss based on the first path loss according to the indication information.

[0011] In the scheme, the second path loss is determined based on the first path loss according to the indication information sent by the first satellite base station, so that the communication overhead required by the second satellite base station and the terminal when determining the second path loss can be effectively reduced.

[0012] In a possible implementation of the first aspect, the indication information includes loss cache flag information or bit instruction information.

[0013] In a possible implementation of the first aspect, when the indication information is the bit instruction information, the method further includes the following steps: sending positive feedback information to the first satellite base station, the positive feedback information being used to indicate that the first path loss exists for the terminal to use.

[0014] In the scheme, when the communication device determines that the first path loss exists for the terminal to use after receiving the bit instruction information, the positive feedback information is sent to the first satellite base station, so that the first satellite base station can make corresponding processing, for example, the first satellite base station does not perform path loss estimation processing when receiving the positive feedback information, and the second path loss is determined by the communication device.

[0015] In a possible implementation of the first aspect, the method further includes the following steps: receiving the validity period of the first path loss sent by the first satellite base station. The validity period can determine the effective time of the first path loss, and the second path loss is determined based on the first path loss within the validity period; and since the first path loss does not need to be stored for a long time, the memory overhead of the communication device can be reduced.

[0016] In a possible implementation of the first aspect, the determining the second path loss based on the first path loss specifically includes: performing frequency conversion based on the first path loss, a carrier frequency of an uplink between the terminal and the second satellite base station, and a carrier frequency of a downlink between the terminal and the second satellite base station to determine the second path loss.

[0017] In this solution, based on the principle that the higher the carrier frequency is, the greater the path loss is, the second path loss can be determined by performing frequency conversion based on the first path loss, a carrier frequency of an uplink between the terminal and the second satellite base station, and a carrier frequency of a downlink between the terminal and the second satellite base station, to ensure the accuracy of the second path loss.

[0018] In a possible implementation of the first aspect, the obtaining the first path loss specifically includes: receiving the first path loss sent by the second satellite base station, the first path loss being obtained by the second satellite base station based on path loss information received from the first satellite base station, the path loss information being information of an uplink path loss between the terminal and the first satellite base station.

[0019] In this solution, the communication device directly receives the first path loss from the second satellite base station, without the need for the communication device to determine the first path loss.

[0020] In a possible implementation of the first aspect, the path loss information includes a road loss list, and the road loss list is at least a mapping table between a position of the terminal, a position of the satellite base station, and an uplink path loss between the terminal and the first satellite base station. The road loss list includes the uplink path loss between the terminal and the first satellite base station corresponding to the position of the terminal and the position of the satellite base station in different cases. The position of the satellite base station is the position of the first satellite base station. For example, when the first path loss is determined based on the road loss list, the position of the terminal and the position of the second satellite base station are used to look up the road loss list to determine the corresponding first path loss, where the position of the second satellite base station is used as the position of the satellite base station for table lookup.

[0021] In a possible implementation of the first aspect, when the first path loss is an uplink path loss between the terminal and the first satellite base station at a first time, the second path loss is equal to the first path loss. In other words, the first path loss is taken as the second path loss.

[0022] In a possible implementation of the first aspect, the method further includes: sending, to the first satellite base station, a power of a reference signal, the power of the reference signal being used to obtain the first path loss. The communication device sends the power of the reference signal to the first satellite base station, so as to obtain the first path loss.

[0023] In a second aspect, the present application provides a communication method applied to a first satellite base station, which can be executed by the first satellite base station or a chip in the first satellite base station.

[0024] The communication method comprises the following steps: sending, to the terminal, indication information used for indicating that a first path loss is enabled as a downlink path loss between the terminal and a second satellite base station, the first path loss being a downlink path loss between the terminal and the first satellite base station at a first time.

[0025] In this solution, the first satellite base station sends the indication information to the terminal, so that the terminal can determine, according to the indication information, an uplink path loss between the terminal and the second satellite base station at a second time based on the first path loss. In this way, the second satellite base station and the terminal can avoid performing path loss estimation processing, and the second satellite base station does not need to indicate a reference signal power and an ID of a reference signal to the terminal, thereby effectively reducing communication overheads required by the second satellite base station and the terminal when determining the uplink path loss.

[0026] In a possible implementation of the second aspect, the indication information comprises road loss cache flag information or bit instruction information.

[0027] In a possible implementation of the second aspect, when the indication information is bit instruction information, the communication method further comprises the following step: receiving forward feedback information sent by the terminal, the forward feedback information being used for indicating that the first path loss exists and is used by the terminal.

[0028] In this solution, the first satellite base station receives the forward feedback information sent by the terminal, and performs corresponding processing, for example, when the first satellite base station receives the forward feedback information, the first satellite base station does not perform path loss estimation processing, and the terminal determines the second path loss.

[0029] In a possible implementation of the second aspect, the communication method further comprises the following step: sending, to the terminal, a validity period of the first path loss.

[0030] In this solution, the first satellite base station further indicates the validity period of the first path loss to the terminal, so that the terminal determines the second path loss based on the first path loss within the validity period, and the terminal does not need to store the first path loss for a long time, thereby reducing memory overheads of the terminal.

[0031] In a third aspect, the present application provides a communication method applied to a second satellite base station, which can be executed by the second satellite base station or a chip in the second satellite base station.

[0032] The communication method comprises the following steps: receiving path loss information sent by the first satellite base station, the path loss information being information of uplink path loss between the terminal and the first satellite base station; and sending first path loss to the terminal based on the path loss information, the first path loss being uplink path loss between the terminal and the first satellite base station at a first time.

[0033] In the scheme, the second satellite base station can determine the first path loss of the terminal based on the path loss information sent by the first satellite base station, so that the terminal determines the second path loss according to the first path loss, the second path loss being uplink path loss between the terminal and the second satellite base station at a second time, the first time being earlier than the second time; the path loss estimation processing of the second satellite base station and the terminal can be avoided, the second satellite base station does not need to indicate the reference signal power and the ID of the reference signal to the terminal, and the communication overhead required by the second satellite base station and the terminal when determining the uplink path loss can be effectively reduced.

[0034] In a possible implementation manner of the third aspect, the path loss information comprises a path loss list, the path loss list at least mapping between uplink path loss between the terminal and the first satellite base station, a position of the terminal, and a position of the satellite base station.

[0035] In a possible implementation manner of the third aspect, the uplink path loss between the terminal and the first satellite base station is obtained by the first satellite base station based on the power of the reference signal sent by the terminal.

[0036] In a fourth aspect, the application further provides a path loss determination method, applied to a communication system. The communication system comprises a terminal, a first satellite base station and a second satellite base station.

[0037] The path loss determination method comprises the following steps: the first satellite base station sends indication information to the terminal, the indication information being used to indicate that the first path loss is enabled as downlink path loss between the terminal and the second satellite base station, the first path loss being downlink path loss between the terminal and the first satellite base station at a first time; and the terminal determines the second path loss based on the first path loss according to the indication information, the second path loss being uplink path loss between the terminal and the second satellite base station at a second time, the first time being earlier than the second time.

[0038] In the scheme, the first satellite base station sends indication information to the terminal, and the terminal can determine the uplink path loss between the terminal and the second satellite base station at the second time based on the first path loss according to the indication information. In this way, the second satellite base station and the terminal can avoid performing path loss estimation processing, the second satellite base station does not need to indicate the reference signal power and the ID of the reference signal to the terminal, and the communication overhead required by the second satellite base station and the terminal when determining the uplink path loss can be effectively reduced.

[0039] In a fifth aspect, the present application also provides a communication system, which includes a terminal, a first satellite base station and a second satellite base station. The first satellite base station is configured to send indication information to the terminal, and the indication information is used to indicate that the first path loss is enabled as the downlink path loss between the terminal and the second satellite base station, and the first path loss is the downlink path loss between the terminal and the first satellite base station at the first time. The terminal is configured to determine the second path loss based on the first path loss according to the indication information. The second path loss is the uplink path loss between the terminal and the second satellite base station at the second time, and the first time is earlier than the second time.

[0040] In the communication system of the scheme, the first satellite base station sends indication information to the terminal, and the terminal can determine the uplink path loss between the terminal and the second satellite base station at the second time based on the first path loss according to the indication information. In this way, the second satellite base station and the terminal can avoid performing path loss estimation processing, the second satellite base station does not need to indicate the reference signal power and the ID of the reference signal to the terminal, and the communication overhead required by the second satellite base station and the terminal when determining the uplink path loss can be effectively reduced.

[0041] In a sixth aspect, the present application also provides a path loss determination method, which is applied to a communication system. The communication system includes a terminal, a first satellite base station and a second satellite base station.

[0042] The path loss determination method includes the following steps: the first satellite base station sends path loss information to the second satellite base station, and the path loss information is the information of the uplink path loss between the terminal and the first satellite base station. The second satellite base station sends the first path loss to the terminal based on the path loss information. The first path loss is the uplink path loss between the terminal and the first satellite base station at the first time.

[0043] In the scheme, the second satellite base station can determine the first path loss of the terminal based on the path loss information sent by the first satellite base station, so that the terminal determines the second path loss according to the first path loss, and the second path loss is the uplink path loss between the terminal and the second satellite base station at a second time point, and the first time point is earlier than the second time point. The second satellite base station and the terminal can avoid path loss estimation processing, the second satellite base station does not need to indicate the reference signal power and the ID of the reference signal to the terminal, and the communication overhead required by the second satellite base station and the terminal when determining the uplink path loss can be effectively reduced.

[0044] In a seventh aspect, the present application also provides a communication system, which includes a terminal, a first satellite base station and a second satellite base station. The first satellite base station is configured to send path loss information to the second satellite base station, and the path loss information is information of uplink path loss between the terminal and the first satellite base station. The second satellite base station is configured to send a second path loss to the terminal based on the path loss information. The second path loss is uplink path loss between the terminal and the second satellite base station at a second time point.

[0045] In the communication system of the scheme, the second satellite base station can determine the second path loss of the terminal based on the path loss information sent by the first satellite base station, and the second satellite base station and the terminal can avoid path loss estimation processing, the second satellite base station does not need to indicate the reference signal power and the ID of the reference signal to the terminal, and the communication overhead required by the second satellite base station and the terminal when determining the uplink path loss can be effectively reduced.

[0046] In an eighth aspect, the present application also provides a communication device, which includes units or modules for executing the method of any one of the first aspect to the third aspect.

[0047] In a ninth aspect, the present application also provides a communication device, which includes a processor and a memory, wherein the processor and the memory are connected, wherein the memory is configured to store program code, and the processor is configured to call the program code to execute the method of any one of the first aspect to the third aspect.

[0048] In a tenth aspect, the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method of any one of the first aspect to the third aspect.

[0049] In an eleventh aspect, the present application also provides a computer program product containing instructions, which, when the computer program product is run on a computer, causes the computer to execute the method of any one of the first aspect to the third aspect.

[0050] In a twelfth aspect, the application further provides a chip, comprising a processor and a data interface, wherein the processor reads instructions stored on a memory through the data interface, and executes the method of any one of the first aspect to the third aspect.

[0051] Optionally, as an implementation manner, the chip can further comprise a memory, wherein the memory stores instructions, and the processor is configured to execute the instructions stored on the memory, and when the instructions are executed, the processor is configured to execute the method of any one of the first aspect to the third aspect. BRIEF DESCRIPTION OF DRAWINGS

[0052] The drawings used in the embodiments of the application are described below.

[0053] FIG. 1A is a schematic diagram of a ground uplink power control framework provided by an embodiment of the application;

[0054] FIG. 1B is a schematic diagram of a single transmission and reception point / multiple transmission and reception point scenario provided by an embodiment of the application;

[0055] FIG. 1C is a schematic diagram of path loss of DL and UL when the orbital height is 350 km provided by an embodiment of the application;

[0056] FIG. 2 is a schematic diagram of a structure of an NTN system provided by an embodiment of the application;

[0057] FIG. 3 is a schematic diagram of a flow of a path loss determination method provided by an embodiment of the application;

[0058] FIG. 4A is a schematic diagram of relay satellite service provided by an embodiment of the application;

[0059] FIG. 4B is a schematic diagram of a specific flow of a path loss determination method provided by an embodiment of the application;

[0060] FIG. 4C is a schematic diagram of inter-satellite interaction provided by an embodiment of the application;

[0061] FIG. 5 is a schematic diagram of a structure of a terminal provided by an embodiment of the application;

[0062] FIG. 6 is a schematic diagram of a structure of a first satellite base station provided by an embodiment of the application;

[0063] FIG. 7 is a schematic diagram of a structure of a second satellite base station provided by an embodiment of the application;

[0064] FIG. 8 is a schematic diagram of a structure of a communication device provided by an embodiment of the application. DETAILED DESCRIPTION

[0065] The technical solutions in the application will be described below with reference to the drawings.

[0066] In this application, the word "exemplary" or "for example" is used to mean "an example of" or "for the purpose of illustration". Any embodiment or design solution described as "exemplary" or "for example" in this application should not be construed as preferred or advantageous over other embodiments or design solutions. In fact, the use of the word "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0067] In this application, the word "exemplary" or "for example" is used to mean "an example of" or "for the purpose of illustration". Any embodiment or design solution described as "exemplary" or "for example" in this application should not be construed as preferred or advantageous over other embodiments or design solutions. In fact, the use of the word "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0068] In addition, unless otherwise stated, the ordinal numbers "first", "second", etc. used in the embodiments of the present application are used to distinguish different objects, and are not used to represent the order, time sequence, priority or importance of the different objects. For example, the first device and the second device are only used for the convenience of description, and do not represent the difference in structure, importance, etc. of the first device and the second device. In some embodiments, the first device and the second device can also be the same device.

[0069] In the above embodiments, the term "when" can be interpreted as meaning "if", "after" or "in response to determining" or "in response to detecting" according to the context. The above is only an optional embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. within the concept and principle of the present application should be included in the protection scope of the present application.

[0070] Referring to FIG. 1A, which is a schematic diagram of an uplink power control framework according to an embodiment of the present application. The basic framework of uplink power control for a terrestrial communication system is open loop power control + fast closed loop power control + other adjustment. The open loop power control is related to the radio resource control (RRC) high layer power control configuration parameters and partial path loss compensation (related to reference signals). The fast closed loop control is related to historical transmission power, such as transmission power control (TPC) and signal to interference plus noise ratio (SINR). The other adjustment is related to frequency domain resource allocation and link adaptation.

[0071] The channels for uplink power control include physical random access channel (PRACH), physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), and sounding reference signal (SRS). The open loop power control part can be represented as P0 + alpha * PL(q), where P0 is the base station expected received power level, and the partial path loss compensation factor alpha = {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1}. The uplink power control has the following goals: goal 1 - allow the terminal to partially compensate for the path loss to reduce interference to adjacent cells and improve transmission rate at the cell edge. Goal 2 - the overall throughput of the cell is the highest (reducing the power of near-point users will result in a decrease in the overall capacity of the cell). Therefore, in order to balance, alpha is 0.7 or 0.8.

[0072] For the calculation of PL, the formula is PL(q) = referenceSignalPower - filterRSRP, where q is the reference signal index, referenceSignalPower is the power of the reference signal, and filterRSRP is the reference signal receiving power (RSRP) measured when sending PRACH. For the same terminal, the path loss corresponding to different serving cells is generally different, and multiple path loss estimates need to be maintained. In actual use, the base station indicates q to obtain the path loss estimate value. In order to avoid too high requirements on the terminal, the number of maintained path losses does not exceed 4. Among them, referenceSignalPower is RRC configured, including two ways: 1) Synchronization Signal / PBCH Block (SSB) based path loss calculation, then referenceSignalPower is ss-PBCH-BlockPower; 2) Channel State Information-Reference Signal (CSI-RS) based path loss calculation, then referenceSignalPower is ss-PBCH-BlockPower + powerControlOffsetSS.

[0073] However, in a satellite communication system, for example, in an NTN system, as the satellite moves, the beam updates frequently, so the PL will continue to change, and the NTN needs to frequently indicate the reference signal power related to the UE path loss estimate and the ID of the reference signal. The UE side needs to frequently perform path loss estimation processing, and the communication overhead is huge.

[0074] In addition, the power control of the ground communication system usually estimates the uplink PL with the downlink reference signal, that is, the uplink (UL) path loss PL_UL is equal to the downlink (DL) path loss PL_DL, PL_UL = PL_DL.

[0075] Referring to FIG. 1B, FIG. 1B is a schematic diagram of a single transmission reception point / multiple transmission reception point scenario according to an embodiment of the present application; for a single transmission reception point / multiple transmission reception point (sTRP / mTRP) scenario, there is only one TRP that supports DL and UL at the same time, and there are multiple TRPs that support uplink. At this time, the downlink sTRP indicates the path loss offset amount offset to obtain the UL PL of the non-DL TRP. That is, PL UL = PL DL + offset.

[0076] In a ground communication system, this makes sense to a certain extent. Specifically, for a time division duplexing (TDD) spectrum, the above PL estimation method (i.e., PL UL = PL DL + offset) is reasonable. For a frequency division duplexing (FDD) spectrum, there is a risk of uplink and downlink asymmetry. However, ground FDD is mainly in the FR1 frequency range, and the frequency difference between DL and UL is small, and the distance difference between different TRPs is also small. Therefore, directly using the method of PL UL = PL DL + offset to obtain the uplink PL does not pose a problem.

[0077] More specifically, for a ground FR1 frequency range, a distance difference of 500 meters, the DL PL is 92.23 dB, and the UL PL is 93.04 dB, and the difference is relatively small. Therefore, the above PL estimation method can solve the problem.

[0078] However, for an NTN system, there are at least two differences from a ground communication system: first, scenario difference: both the downlink and uplink budgets of the NTN are insufficient, and there are a large number of DL mTRP / UL mTRP scenarios. Second, PL estimation difference: referring to FIG. 1C, FIG. 1C is a schematic diagram of the path loss of DL and UL when the orbit height is 350 km according to an embodiment of the present application; there is a problem of large DL / UL difference and large UL / UL difference in the NTN. The above differences result in low accuracy of the path loss estimated by the NTN system using the method of PL UL = PL DL + offset.

[0079] Therefore, the embodiment of the present application provides a path loss determination method, which can reduce the communication overhead required by the satellite base station and the terminal when determining the path loss.

[0080] The path loss determination method is performed by a communication device or a chip in the communication device. The communication device can be a terminal or the like.

[0081] The path loss determination method of the embodiments of the present application can be applied to future communication systems such as a satellite communication system (for example, an NTN system). The satellite communication system includes a satellite base station, a ground station, and a terminal type network element. The satellite base station provides communication services for the terminal. The satellite base station transmits downlink data to the terminal, where the data is encoded using channel coding, and the encoded data is transmitted to the terminal after constellation modulation. The terminal transmits uplink data to the satellite base station, which can also be encoded using channel coding, and the encoded data is transmitted to the satellite base station after constellation modulation.

[0082] Referring to FIG. 2, FIG. 2 is a structural schematic diagram of an NTN system according to an embodiment of the present application. The NTN technology integrates satellite communication and 5G technology, and proposes the network application architecture shown in FIG. 2. The NTN system includes a terminal 201, a satellite base station 202, a ground station 203, and a 5G core network.

[0083] The terminal 201 is a short form of terminal device, also known as user equipment (UE), which refers to a mobile device supporting 5G new air interface. It can access the satellite network through the air interface and initiate calls, online services, etc. It can include various handheld devices with wireless communication functions (such as mobile phones, smart watches, tablet computers, etc.), vehicle-mounted devices, wearable devices, Internet of Things terminal devices, computing devices, or other processing devices connected to wireless modems, as well as various forms of terminals, mobile stations (MS), terminals (Terminal), soft terminals, access terminals, terminal device units (Subscriber Unit), terminal device stations, mobile stations, mobile stations (MS), remote stations, remote terminals, mobile devices, terminal device agents, terminal device devices, etc. For example, water meters, electricity meters, sensors, etc.

[0084] The satellite base station 202 mainly provides wireless access services, schedules wireless resources for access terminals, and provides reliable wireless transmission protocols and data encryption protocols, etc. In this embodiment, the terminal 201 accesses the network through the 5G new air interface, and the satellite base station 202 is a 5G base station; the 5G base station is deployed on a satellite and connected to the ground core network through a wireless link.

[0085] 5G core network: responsible for user access control, mobility management, session management, user security authentication, billing and other services. It is composed of multiple functional units and can be divided into control plane and data plane functional entities. For example, the access and mobility management function (AMF) network element 206 is responsible for user access management, security authentication, and mobility management. The user plane function (UPF) network element 204 is responsible for managing user plane data transmission, traffic statistics, and other functions. The data network (DN) 205 is an operator network that provides data transmission services for users, such as IP multimedia services (IMS), the Internet, and the like. The session management function (SMF) network element 207 is mainly responsible for session management in the mobile network, such as session establishment, modification, and release.

[0086] The ground station 203 is responsible for forwarding signaling and service data between the satellite base station 202 and the 5G core network.

[0087] In FIG. 2, the 5G new radio is a wireless link between the terminal and the base station. The NG interface is the interface between the 5G base station and the 5G core network, mainly for interacting with the core network NAS and other signaling and user service data. At the same time, there is a wireless link between the satellite base stations 202 to complete the signaling interaction and user data transmission between the satellite base stations. In this embodiment, the satellite base station 202 is taken as an example of a 5G base station, and the interface between the 5G base stations is the Xn interface, mainly used for signaling interaction such as handover.

[0088] The path loss determination method provided in the embodiments of the present application will be described in detail below.

[0089] The path loss determination method of the embodiments of the present application is applied to a communication system, which includes a terminal, a first satellite base station, and a second satellite base station.

[0090] Referring to FIG. 3, in this embodiment, the execution subject of the path loss determination method is taken as an example of a terminal, and the above path loss determination method includes the following steps:

[0091] 301. The terminal acquires a first path loss, which is the downlink path loss or uplink path loss between the terminal and the first satellite base station at a first time.

[0092] The downlink refers to the link of the satellite base station transmitting to the terminal. The uplink refers to the link of the terminal transmitting to the satellite base station.

[0093] 302、the terminal determines the second path loss based on the first path loss, the second path loss being an uplink path loss between the terminal and the second satellite base station at a second time, the first time being earlier than the second time.

[0094] In this embodiment, the terminal can determine the uplink path loss between the terminal and the second satellite base station at the second time based on the downlink path loss or the uplink path loss between the terminal and the first satellite base station at the first time, so that the second satellite base station and the terminal can avoid performing path loss estimation processing, the second satellite base station does not need to indicate the reference signal power and the ID of the reference signal to the terminal, and the communication overhead required by the second satellite base station and the terminal when determining the uplink path loss can be effectively reduced.

[0095] In a possible implementation, the path loss determination method further includes the following steps:

[0096] The first satellite base station sends the terminal the validity period of the first path loss.

[0097] Correspondingly, the terminal receives the validity period of the first path loss sent by the first satellite base station.

[0098] Specifically, the validity period can determine the valid time of the first path loss, and the terminal determines the second path loss based on the first path loss within the validity period; and since the terminal does not need to store the first path loss for a long time (for example, the first path loss can be deleted as soon as the validity period of the first path loss expires), the memory overhead of the terminal can be reduced.

[0099] In a possible implementation, when the first path loss is the downlink path loss between the terminal and the first satellite base station at the first time, the path loss determination method further includes the following steps:

[0100] The first satellite base station sends the terminal indication information, the indication information being used to indicate that the first path loss is enabled as the downlink path loss between the terminal and the second satellite base station.

[0101] Correspondingly, the terminal receives the indication information sent by the first satellite base station.

[0102] At this time, the step 302 specifically includes the following steps:

[0103] The terminal determines the second path loss based on the first path loss according to the indication information.

[0104] In this embodiment, the terminal determines the second path loss based on the first path loss according to the indication information sent by the first satellite base station, so that the communication overhead required by the second satellite base station and the terminal when determining the second path loss can be effectively reduced.

[0105] In a possible implementation, the step 302 comprises the following steps when determining the second path loss:

[0106] The terminal performs frequency conversion according to the first path loss, the carrier frequency of the uplink between the terminal and the second satellite base station, and the carrier frequency of the downlink between the terminal and the second satellite base station to determine the second path loss.

[0107] In this embodiment, according to the principle that the higher the carrier frequency is, the greater the path loss is, the second path loss can be determined by performing frequency conversion according to the first path loss, the carrier frequency of the uplink between the terminal and the second satellite base station, and the carrier frequency of the downlink between the terminal and the second satellite base station, which can effectively ensure the accuracy of the second path loss.

[0108] For example, assuming that the first path loss is PL1, the second path loss is PL2, the carrier frequency of the uplink between the terminal and the second satellite base station is Z1, and the carrier frequency of the downlink between the terminal and the second satellite base station is Z2, PL1, PL2, Z1, and Z2 satisfy the following formula: PL2=a+20log10(Z2); PL1=a+20log10(Z1).

[0109] Therefore, PL2-PL1=20log10(Z2 / Z1), that is, PL2=20log10(Z2 / Z1)+PL1.

[0110] wherein a is a constant.

[0111] In a possible implementation, the indication information comprises loss cache flag information or bit instruction information.

[0112] In a possible implementation, when the indication information is the loss cache flag information, the first satellite base station sends the indication information to the terminal, and the terminal determines the second path loss based on the first path loss according to the indication information. Further, the first satellite base station also sends the validity period of the first path loss to the terminal, and the terminal determines the second path loss based on the first path loss within the validity period. Specifically, the terminal determines the second path loss based on the first path loss according to the indication information within the validity period.

[0113] In a possible implementation, when the indication information is the loss cache flag information, the first satellite base station sends the indication information to the terminal when determining that the terminal is a non-moving terminal, and the terminal determines the second path loss based on the first path loss according to the indication information.

[0114] Specifically, referring to FIG. 4A, which is a schematic diagram of relay satellite service provided by an embodiment of the present application, the embodiment proposes a power control method based on satellite relay. A terminal 401 estimates a downlink path loss between a first satellite base station 402 and the terminal 401, denoted as PL1, and performs buffering. When a second satellite base station 403 takes over the first satellite base station 402 to provide service, PL1 is taken as a downlink path loss PL2 between the second satellite base station 403 and the terminal 401, i.e., PL1 = PL2. By way of example, FIG. 4A is for a scenario where the terminal does not move, e.g., a Very Small Aperture Terminal (VSAT) device installed on a roof. When the second satellite base station 403 takes over the first satellite base station 402 to provide service for the terminal 401, the second satellite base station 403 and the first satellite base station 402 are in the same position, and thus PL2 = PL1 can be obtained, thereby simplifying the calculation of the path loss between the terminal and the second satellite base station.

[0115] Further by way of example, referring to FIG. 4B, which is a specific flowchart of a path loss determination method provided by an embodiment of the present application, the method includes the following steps:

[0116] B401. The terminal reports motion capability information to the first satellite base station.

[0117] Specifically, the motion capability information is various information indicating the motion state of the terminal, such as pose information, speed information, or acceleration information of the terminal, without particular limitation.

[0118] B402. The first satellite base station classifies the terminal based on the motion capability information.

[0119] Specifically, the first satellite base station identifies the motion state of the terminal based on the motion capability information of the terminal, to determine whether the terminal is a non-motion state terminal or a motion state terminal. For example, if the acceleration of the terminal is zero for a certain period of time, it can be determined that the terminal is a non-motion state terminal, otherwise, the terminal is a motion state terminal.

[0120] B403. The first satellite base station sends path loss buffering flag information to the terminal.

[0121] By way of example, the path loss buffering flag information can be PL_buffer_flag, to instruct the terminal to use the historical downlink PL for uplink power control, i.e., to instruct the terminal to determine the second path loss based on the first path loss, i.e., the terminal uses the downlink PL between the first satellite base station and the terminal for uplink power control between the terminal and the second satellite base station.

[0122] B404. The first satellite base station sends the validity period of the first path loss to the terminal.

[0123] Specifically, the first satellite base station indicates the terminal to apply the range of historical downlink PL to ensure the freshness of the downlink PL; and reduce the terminal's cache and memory overhead.

[0124] Further exemplarily, the path loss cache flag information and the validity period can be delivered by using a system information block (SIB), an RRC message, a media access control element (MAC CE), or downlink control information (DCI).

[0125] Correspondingly, after receiving the path loss cache flag information, the terminal stores the previously estimated downlink PL between the first satellite base station and the terminal, which is used for path loss estimation between the second satellite base station and the terminal within the validity period. Specifically, the terminal can perform frequency conversion according to the UL and DL carrier frequencies and the downlink PL between the first satellite base station and the terminal, and finally obtain the uplink PL between the second satellite base station and the terminal.

[0126] The embodiment shown in FIGS. 4A and 4B uses an estimation-free PL acquisition method based on the terminal's location information; can avoid PL estimation between the relay satellite (i.e., the second satellite base station) and the terminal, reduce air interface data transmission and terminal-side RSRP filtering and estimation, such as reducing the transmission reference signal power, the reference signal ID, and the path loss offset; and can determine the PL with low latency.

[0127] In a possible implementation, when the indication information is bit instruction information, the path loss determination method further includes the following steps:

[0128] The terminal sends forward feedback information to the first satellite base station, and the forward feedback information is used to indicate that there is a first path loss for the terminal to use.

[0129] Correspondingly, the first satellite base station receives the forward feedback information sent by the terminal.

[0130] In the embodiment of the present application, when the terminal determines that the first path loss exists for the terminal to use after receiving the bit instruction information sent by the first satellite base station, the terminal sends the positive feedback information to the first satellite base station, so that the first satellite base station makes corresponding processing. For example, when the first satellite base station receives the positive feedback information, the first satellite base station does not perform path loss estimation processing, and the terminal determines the second path loss based on the first path loss. The method of the embodiment of the present application can obtain the second path loss. For example, when the second satellite base station is an uplink only (UL-only) base station, the method of the embodiment of the present application can successfully obtain the second path loss.

[0131] When the terminal determines that the first path loss does not exist for the terminal to use, the terminal sends the negative feedback information to the first satellite base station. After the first satellite base station receives the negative feedback information, the first satellite base station falls back to the existing path loss determination mechanism. For example, the first satellite base station sends the path loss offset offset to the terminal, and the terminal obtains the PL of the UL-only link between the second satellite base station and the terminal based on the offset (PL_UL=PL_DL+offset), and performs uplink power control.

[0132] Specifically, when the indication information is the bit instruction information, the path loss determination method specifically includes the following steps:

[0133] S1, the first satellite base station sends the bit instruction information to the terminal.

[0134] For example, the bit instruction information is 1-bit instruction information, for example, enable. The bit instruction information indicates that the terminal can enable the historical first path loss as the downlink PL between the second satellite base station and the terminal to perform the uplink power control between the second satellite base station and the terminal.

[0135] S2, the terminal receives the bit instruction information and replies the positive feedback information or the negative feedback information to the first satellite base station.

[0136] For example, the positive feedback information can be ACK, and the negative feedback information can be NACK. The positive feedback information is used to feed back that the first path loss exists for the terminal to use, and the negative feedback information is used to feed back that the first path loss does not exist for the terminal to use.

[0137] For another example, when the terminal has the first path loss, the terminal sends the positive feedback information to the first satellite base station. Conversely, the terminal sends the negative feedback information to the first satellite base station.

[0138] S3, processing of the first satellite base station.

[0139] The processing of the first satellite base station includes the following two scenarios:

[0140] Scenario one: the first satellite base station receives ACK. For this scenario, the first satellite base station does not process, that is, the terminal can use the historical downlink PL (i.e., the first path loss) for uplink power control, i.e., to determine the second path loss. For details, refer to the description of determining the second path loss in step 302.

[0141] Scenario two: the first satellite base station receives NACK. For this scenario, it is necessary to fall back to the existing mechanism, that is, the first satellite base station issues a path loss offset to the terminal, and the terminal obtains the PL of the UL-only link between the second satellite base station and the terminal based on the offset (PL_UL = PL_DL + offset) for uplink power control.

[0142] In this embodiment, for the UL-only scenario, the problem that the UL-only base station cannot obtain the PL is solved by enabling the historical downlink PL. And the problem of large path loss difference caused by large frequency difference between UL and DL in NTN is solved in a low-latency manner.

[0143] In a possible implementation, the first satellite base station sends path loss information to the second satellite base station, the path loss information being information of an uplink path loss between the terminal and the first satellite base station.

[0144] In addition, step 301 specifically includes the following steps:

[0145] The second satellite base station sends the first path loss to the terminal, the first path loss being obtained by the second satellite base station based on the path loss information received from the first satellite base station. In the embodiment of the application, the first path loss is the uplink path loss between the terminal and the first satellite base station at the first time.

[0146] Correspondingly, the terminal receives the first path loss sent by the second satellite base station.

[0147] In the embodiment of the application, the terminal directly receives the first path loss from the second satellite base station, without the terminal determining the first path loss.

[0148] Further, when the first path loss is the uplink path loss between the terminal and the first satellite base station at the first time, the second path loss is equal to the first path loss. In other words, the terminal takes the first path loss received from the second satellite base station as the second path loss.

[0149] Illustratively, the path loss information includes the first path loss or a path loss list.

[0150] In a possible implementation, the path loss information is a first path loss. After the first satellite base station obtains the first path loss, the first satellite base station sends the first path loss to the second satellite base station, so that the second satellite base station can send the first path loss to the terminal.

[0151] In another possible implementation, the path loss information is a path loss list. The path loss list is at least a mapping table of an uplink path loss between the terminal and the first satellite base station, a location of the terminal, and a location of the satellite base station. The path loss list includes the uplink path loss between the terminal and the first satellite base station corresponding to the location of the terminal and the location of the satellite base station in different cases. The location of the satellite base station is the location of the first satellite base station. For example, when the second satellite base station determines the first path loss based on the path loss list, the second satellite base station looks up the path loss list based on the location of the terminal and the location of the second satellite base station to determine the corresponding first path loss, where the location of the second satellite base station is used as the location of the satellite base station for table lookup.

[0152] Further exemplarily, the path loss list can further include at least one of a working bandwidth (BandWidth Part, BWP) of the terminal, a polarization mode of the terminal, or a polarization mode of the satellite base station. The polarization mode of the terminal includes horizontal polarization and vertical polarization, and the polarization mode of the satellite base station includes left-handed circular polarization (Left-Handed Circular Polarization, LHCP) and right-handed circular polarization (Right-Handed Circular Polarization, RHCP). For example, when the path loss list further includes the working bandwidth of the terminal, the path loss list is a mapping table of the uplink path loss between the terminal and the first satellite base station, the working bandwidth of the terminal, the location of the terminal, and the location of the satellite base station.

[0153] When the path loss list can further include the working bandwidth of the terminal and the polarization mode of the satellite base station, the path loss list is a mapping table of the uplink path loss between the terminal and the first satellite base station, the working bandwidth of the terminal, the location of the terminal, the location of the satellite base station, and the polarization mode of the satellite base station. Exemplarily, the path loss list is shown in Table 1, where PL is the uplink path loss between the terminal and the first satellite base station.

[0154] Table 1: Path loss list

[0155] In a possible implementation, the path loss determination method further includes the following steps:

[0156] The terminal sends a reference signal power to the first satellite base station. The reference signal power is used to obtain the first path loss.

[0157] Correspondingly, the first satellite base station receives the power of the reference signal.

[0158] In the embodiments of the present application, the terminal sends the power of the reference signal to the first satellite base station, so that the first satellite base station obtains the first path loss based on the power of the reference signal, and the specific method for obtaining the first path loss is not particularly limited.

[0159] For example, referring to FIG. 4C, FIG. 4C is a schematic diagram of inter-satellite interaction provided by the embodiments of the present application; the path loss determination method in the embodiments of the present application includes the following steps:

[0160] Step 1, the terminal 401 sends the power of the reference signal to the first satellite base station 402.

[0161] For example, the power of the reference signal can be the power of the SRS signal, etc.

[0162] Step 2, the first satellite base station 402 performs uplink PL estimation according to the power of the reference signal.

[0163] For example, the first satellite base station 402 obtains the uplink PL according to the power of the reference signal and the RSRP, i.e. PL(u) = Reference_signal_ul–RSRP_ul; Reference_signal_ul is the power of the reference signal, and RSRP_ul is the measured value of the reference signal receiving power.

[0164] In addition, the first satellite base station 402 obtains the path loss list according to the positions of different terminals 401, the positions of different satellite base stations and the corresponding uplink PL. Further for example, the first satellite base station 402 can obtain the path loss list according to the mapping relationship between the uplink path loss between the terminal 401 and the first satellite base station 402, the working bandwidth of the terminal 401, the position of the terminal 401, the position of the satellite base station and the polarization mode of the satellite base station, as shown in Table 1 above.

[0165] Step 3, when inter-satellite switching occurs, the first satellite base station 402 transmits the path loss list 404 to the second satellite base station 403.

[0166] For example, the first satellite base station 402 sends the path loss list 404 to the second satellite base station 403 through the inter-satellite link (Inter-Satellite Links, ISL).

[0167] Step 4, when the second satellite base station 403 schedules the terminal 401, the corresponding uplink PL is issued to the terminal 401.

[0168] Specifically, the second satellite base station 403 obtains the corresponding uplink PL based on the road loss list 404, and sends it to the terminal 401. For example, the second satellite base station 403 looks up Table 1 according to the current location of the terminal 401, the location of the satellite base station (i.e. the current location of the second satellite base station 403), the working bandwidth of the terminal 401, and the polarization mode of the satellite base station (i.e. the polarization mode of the current second satellite base station 403) to obtain the corresponding uplink PL, and sends the uplink PL to the terminal 401.

[0169] Step 5, the terminal 401 receives the uplink PL sent by the second satellite base station 403, and sends uplink data to the second satellite base station 403 based on the uplink PL.

[0170] Specifically, the terminal 401 takes the received uplink PL (the original uplink PL between the terminal 401 and the first satellite base station 402, i.e. the first path loss) as the uplink PL between the terminal 401 and the second satellite base station 403, i.e. the second path loss.

[0171] The embodiment of the present application can avoid the PL estimation of the relay satellite and the terminal, reduce the air interface data transmission and the filtering and estimation of the terminal side RSRP, such as reducing the transmission of the reference signal power, the ID of the reference signal and the path loss offset, and determine the PL with low latency, and solve the problem of large road loss difference (more than 3dB) caused by large frequency difference between UL and DL in NTN.

[0172] The device provided by the present application will be described in detail below.

[0173] The present application provides a communication device, which includes a unit or module for executing the method described in any of the above embodiments. The communication device can be a terminal, a first satellite base station or a second satellite base station.

[0174] Referring to FIG. 5, FIG. 5 is a structural schematic diagram of a terminal according to an embodiment of the present application. The terminal shown in FIG. 5 can be used to realize the functions of the path loss determination method embodiments shown in FIG. 3, and thus can also realize the beneficial effects possessed by the path loss determination method embodiments. In the embodiments of the present application, the terminal can be an electronic device, and can also be a module (such as a chip) applied in an electronic device.

[0175] As shown in FIG. 5, the terminal 500 includes an acquisition module 510 and a determination module 520. The terminal 500 is used to realize the functions of the path loss determination method embodiments. Alternatively, the terminal 500 can include a module for realizing any function or operation of the path loss determination method embodiments, which can be realized by software, hardware, firmware or any combination thereof, in whole or in part.

[0176] When the terminal 500 is configured to implement the functions of the above-mentioned path loss determination method embodiments, the obtaining module 510 is configured to obtain a first path loss, the first path loss being a downlink path loss or an uplink path loss between the terminal and a first satellite base station at a first time. The determining module 520 is configured to determine a second path loss based on the first path loss, the second path loss being an uplink path loss between the terminal and a second satellite base station at a second time, the first time being earlier than the second time.

[0177] In a possible implementation, when the first path loss is a downlink path loss between the terminal and the first satellite base station at the first time, referring to FIG. 5, the terminal 500 further includes a receiving module 530.

[0178] The receiving module 530 is configured to receive indication information sent by the first satellite base station, the indication information being used to indicate that the first path loss is enabled as a downlink path loss between the terminal and the second satellite base station.

[0179] The determining module 520 is specifically configured to determine the second path loss based on the first path loss according to the indication information.

[0180] In a possible implementation, the indication information includes loss cache flag information or bit instruction information.

[0181] In a possible implementation, when the indication information is bit instruction information, referring to FIG. 5, the terminal 500 further includes a sending module 540.

[0182] The sending module 540 is configured to send forward feedback information to the first satellite base station, the forward feedback information being used to indicate that the first path loss exists for the terminal to use.

[0183] In a possible implementation, the receiving module 530 is further configured to receive a validity period of the first path loss sent by the first satellite base station.

[0184] In a possible implementation, the determining module 520 is specifically configured to perform frequency conversion according to the first path loss, a carrier frequency of an uplink between the terminal and the second satellite base station, and a carrier frequency of a downlink between the terminal and the second satellite base station to determine the second path loss, when determining the second path loss based on the first path loss.

[0185] In a possible implementation, the obtaining module 510 is specifically configured to receive the first path loss sent by the second satellite base station, the first path loss being obtained by the second satellite base station based on path loss information received from the first satellite base station, the path loss information being information of an uplink path loss between the terminal and the first satellite base station.

[0186] In a possible implementation, the path loss information includes a path loss list, and the path loss list is at least a mapping table between an uplink path loss between the terminal and the first satellite base station, a location of the terminal, and a location of the satellite base station.

[0187] In a possible implementation, when the first path loss is an uplink path loss between the terminal and the first satellite base station at the first time, the second path loss is equal to the first path loss. In other words, the first path loss is taken as the second path loss.

[0188] In a possible implementation, the sending module 540 is further configured to send, to the first satellite base station, a power of a reference signal, and the power of the reference signal is used to obtain the first path loss.

[0189] The above description of the modules can refer to the description of the path loss determination method embodiments, and thus is not repeated here.

[0190] Referring to FIG. 6, FIG. 6 is a structural schematic diagram of a first satellite base station according to an embodiment of the present application. The first satellite base station shown in FIG. 6 can be used to implement the functions of the first satellite base station in the path loss determination method embodiments, and thus can also achieve the beneficial effects of the first satellite base station in the path loss determination method embodiments. In the embodiments of the present application, the first satellite base station can be an electronic device, and can also be a module (such as a chip) applied to an electronic device.

[0191] As shown in FIG. 6, the first satellite base station 600 includes a sending module 610. The first satellite base station 600 is configured to implement the functions of the first satellite base station in the path loss determination method embodiments. Alternatively, the first satellite base station 600 can include a module for implementing any function or operation of the first satellite base station in the path loss determination method embodiments, and the module can be implemented by software, hardware, firmware, or any combination thereof, in whole or in part.

[0192] When the first satellite base station 600 is configured to implement the functions of the first satellite base station in the path loss determination method embodiments, the sending module 610 is configured to send, to the terminal, indication information, and the indication information is used to indicate that the first path loss is taken as a downlink path loss between the terminal and a second satellite base station, and the first path loss is a downlink path loss between the terminal and the first satellite base station at a first time.

[0193] In a possible implementation, the indication information includes path loss cache flag information or bit instruction information.

[0194] In a possible implementation, when the indication information is bit instruction information, the first satellite base station 600 further includes a receiving module 620.

[0195] The receiving module 620 is configured to receive forward feedback information sent by the terminal, the forward feedback information being used to indicate that the first path loss exists for the terminal to use.

[0196] In a possible implementation, the sending module 610 is further configured to send, to the terminal, a validity period of the first path loss.

[0197] The above description of the modules can refer to the description of the first satellite base station in the foregoing path loss determination method embodiments, and thus is not repeated here.

[0198] Referring to FIG. 7, FIG. 7 is a structural schematic diagram of a second satellite base station according to an embodiment of the present application. The second satellite base station shown in FIG. 7 can be used to implement the functions of the second satellite base station in the foregoing path loss determination method embodiments, and thus can also achieve the beneficial effects of the second satellite base station in the foregoing path loss determination method embodiments. In embodiments of the present application, the second satellite base station can be an electronic device, and can also be a module (such as a chip) applied to an electronic device.

[0199] As shown in FIG. 7, the second satellite base station 700 includes a receiving module 710. The second satellite base station 700 is configured to implement the functions of the second satellite base station in the foregoing path loss determination method embodiments. Alternatively, the second satellite base station 700 can include a module for implementing any function or operation of the second satellite base station in the foregoing path loss determination method embodiments, and the module can be implemented by software, hardware, firmware, or any combination thereof, in whole or in part.

[0200] When the second satellite base station 700 is configured to implement the functions of the second satellite base station in the foregoing path loss determination method embodiments, the receiving module 710 is configured to receive path loss information sent by the first satellite base station, the path loss information being information of an uplink path loss between the terminal and the first satellite base station. The sending module 720 is configured to send, to the terminal, a first path loss based on the path loss information, the first path loss being an uplink path loss between the terminal and the first satellite base station at a first time.

[0201] In a possible implementation, the path loss information includes a path loss list, and the path loss list is at least a mapping table between the uplink path loss between the terminal and the first satellite base station, the position of the terminal, and the position of the satellite base station.

[0202] In a possible implementation, the uplink path loss between the terminal and the first satellite base station is obtained by the first satellite base station based on the power of a reference signal sent by the terminal.

[0203] The above modules can refer to the description of the second satellite base station in the path loss determination method embodiments, and will not be repeated here.

[0204] Referring to FIG. 8, FIG. 8 is a structural schematic diagram of a communication device according to an embodiment of the present application. The communication device 800 includes a processor 810 and an interface circuit 820. The processor 810 and the interface circuit 820 are coupled with each other. It can be understood that the interface circuit 820 can be a transceiver or an input / output interface. Optionally, the communication device 800 can further include a memory 830 for storing instructions executed by the processor 810 or storing input data required by the processor 810 to run instructions or storing data generated after the processor 810 runs instructions. The memory 830 can be one or more, and the processor 810 can be one or more.

[0205] When the communication device 800 is used to implement the functions of the path loss determination method shown in FIG. 3, the processor 810 is configured to implement the functions of the determination module 520, and the interface circuit 820 is configured to implement the functions of the acquisition module 510, the receiving module 530 and the sending module 540.

[0206] When the communication device 800 is used to implement the functions of the first satellite base station in the path loss determination method, the interface circuit 820 is configured to implement the functions of the sending module 610 and the receiving module 620.

[0207] When the communication device 800 is used to implement the functions of the second satellite base station in the path loss determination method, the interface circuit 820 is configured to implement the functions of the receiving module 710 and the sending module 720.

[0208] When the communication device 800 is a chip applied to a network device, the network device chip implements the functions of the network device in the method embodiments. The network device chip receives information from other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by a terminal device to the network device. Alternatively, the network device chip sends information to other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the network device to the terminal device.

[0209] Exemplarily, the communication device 800 can be a chip or a chip system.

[0210] It can be understood that the processor 810 in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0211] The memory 830 can be a read only memory (ROM), a static storage device, a dynamic storage device or a random access memory (RAM). The memory 830 can store programs, and when the programs stored in the memory 830 are executed by the processor 810, the processor 810 is configured to perform the steps of the path loss determination method described in any of the above embodiments.

[0212] The present application also provides a communication system, which comprises the terminal, the first satellite base station and the second satellite base station described in any of the above embodiments.

[0213] The method steps in the embodiments of the present application can be realized by hardware or by the 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 well 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 an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal device. Of course, the processor and the storage medium can also exist as discrete components in the network device or the terminal device.

[0214] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are performed. The computer can be a general purpose computer, a special purpose computer, a computer network, a network device, a user equipment or other programmable apparatus. The computer programs or instructions can 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 programs or instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center through wired or wireless manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center and the like integrated with one or more available media. The available media can be a magnetic medium, for example, a floppy disk, a hard disk, a magnetic tape; can also be an optical medium, for example, a digital video disc; can also be a semiconductor medium, for example, a solid state disk.

[0215] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

Claims

1. A path loss determination method, characterized by, The method comprises: obtaining a first path loss, the first path loss being a downlink path loss or an uplink path loss between a terminal and a first satellite base station at a first time point; determining a second path loss based on the first path loss, the second path loss being an uplink path loss between the terminal and a second satellite base station at a second time point, the first time point being earlier than the second time point.

2. The method of claim 1, wherein, The first path loss is a downlink path loss between the terminal and the first satellite base station at a first time point, and the method further comprises: receiving indication information sent by the first satellite base station, the indication information being used to indicate that the first path loss is enabled as a downlink path loss between the terminal and the second satellite base station; The determination of the second path loss based on the first path loss comprises: determining the second path loss based on the first path loss according to the indication information.

3. The method of claim 2, wherein, The indication information comprises road loss cache flag information or bit instruction information.

4. The method of claim 3, wherein, The indication information is the bit instruction information, and the method further comprises: sending positive feedback information to the first satellite base station, the positive feedback information being used to indicate that the first path loss exists for the terminal to use.

5. The method according to any one of claims 2-4, characterized in that, The method further comprises: receiving a validity period of the first path loss sent by the first satellite base station.

6. The method according to any one of claims 2-5, characterized in that, The determination of the second path loss based on the first path loss comprises: frequency conversion according to the first path loss, a carrier frequency of an uplink between the terminal and the second satellite base station, and a carrier frequency of a downlink between the terminal and the second satellite base station to determine the second path loss.

7. The method of claim 1, wherein, The obtaining of the first path loss comprises: receiving the first path loss sent by the second satellite base station, the first path loss being obtained by the second satellite base station based on path loss information received from the first satellite base station, the path loss information being information of an uplink path loss between a terminal and the first satellite base station.

8. The method of claim 7, wherein, The path loss information comprises a road loss list, and the road loss list is at least a mapping table between an uplink path loss between the terminal and the first satellite base station, a position of the terminal, and a position of the satellite base station.

9. The method according to claim 7 or 8, characterized in that, The first path loss is an uplink path loss between the terminal and the first satellite base station at the first time point, and the second path loss is equal to the first path loss.

10. The method according to any one of claims 7-9, characterized in that, The method further comprises: sending a power of a reference signal to the first satellite base station, the power of the reference signal being used to obtain the first path loss.

11. A communication method, comprising: Applied to a first satellite base station, the method comprises: sending indication information to a terminal, the indication information being used to indicate that a first path loss is enabled as a downlink path loss between the terminal and a second satellite base station, the first path loss being a downlink path loss between the terminal and the first satellite base station at a first time point.

12. The method of claim 11, wherein, The indication information comprises road loss cache flag information or bit instruction information.

13. The method of claim 12, wherein, The indication information is the bit instruction information, and the method further comprises: Receiving forward feedback information sent by the terminal, the forward feedback information being used to indicate that the first path loss exists for the terminal to use.

14. The method according to any one of claims 11-13, characterized in that, The method further comprises: Sending an effective period of the first path loss to the terminal.

15. A method of communication, comprising: The method applied to a second satellite base station comprises: Receiving path loss information sent by a first satellite base station, the path loss information being information of uplink path loss between a terminal and the first satellite base station; Based on the path loss information, sending a first path loss to the terminal, the first path loss being uplink path loss between the terminal and the first satellite base station at a first time.

16. The method of claim 15, wherein, The path loss information comprises a path loss list, the path loss list being at least a mapping table between uplink path loss between the terminal and the first satellite base station, a position of the terminal and a position of the satellite base station.

17. The method of claim 16, wherein, The uplink path loss between the terminal and the first satellite base station is obtained by the first satellite base station based on power of a reference signal sent by the terminal.

18. A path loss determination method, characterized by, The method applied to a communication system comprising a terminal, a first satellite base station and a second satellite base station comprises: The first satellite base station sends indication information to the terminal, the indication information being used to indicate that a first path loss is enabled as downlink path loss between the terminal and the second satellite base station, the first path loss being downlink path loss between the terminal and the first satellite base station at a first time; The terminal determines a second path loss based on the first path loss according to the indication information, the second path loss being uplink path loss between the terminal and the second satellite base station at a second time, the first time being earlier than the second time.

19. A communication system, characterized by The communication system comprises a terminal, a first satellite base station and a second satellite base station, wherein The first satellite base station is configured to send indication information to the terminal, the indication information being used to indicate that a first path loss is enabled as downlink path loss between the terminal and the second satellite base station, the first path loss being downlink path loss between the terminal and the first satellite base station at a first time; The terminal is configured to determine a second path loss based on the first path loss according to the indication information, the second path loss being uplink path loss between the terminal and the second satellite base station at a second time, the first time being earlier than the second time.

20. A path loss determination method, comprising: The method applied to a communication system comprising a terminal, a first satellite base station and a second satellite base station comprises: The first satellite base station sends path loss information to the second satellite base station, the path loss information being information of uplink path loss between the terminal and the first satellite base station; The second satellite base station sends a first path loss to the terminal based on the path loss information, the first path loss being uplink path loss between the terminal and the first satellite base station at a first time.

21. A communication system, characterized by The communication system comprises a terminal, a first satellite base station and a second satellite base station, wherein The first satellite base station is configured to send path loss information to the second satellite base station, the path loss information being information of uplink path loss between the terminal and the first satellite base station; The second satellite base station is configured to send a second path loss to the terminal based on the path loss information, the second path loss being uplink path loss between the terminal and the second satellite base station at a second time.

22. A communications device, characterized by The device comprises units or modules for performing the method of any one of claims 1-17.

23. A communications device, characterized by A device comprising a processor and a memory, wherein the processor and the memory are connected, wherein the memory is configured to store program code, and the processor is configured to invoke the program code to perform the method of any one of claims 1-17.

24. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the method of any one of claims 1-17.

25. A computer program product, characterised in that, The computer program product comprises a computer program, and the computer program is executed to implement the method of any one of claims 1-17.

Images