Communication method, device, medium, and computer program product

Abstract

The present disclosure relates to a communication method, a device, a medium, and a computer program product. The method executed by a first network device comprises: acquiring location information of a second network device on the ground; and on the basis of ephemeris information of a satellite and the location information of the second network device, performing frequency domain compensation on a signal on a control link between the first network device on the satellite and the second network device on the ground. The present disclosure can improve the communication quality of the control link.

Description

Communication method, device, medium and computer program product TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of communication, and particularly relates to a communication method, device, medium and computer program product. BACKGROUND

[0002] In order to improve the coverage of a communication system, a relay device can be added in the communication system, and relay transmission is performed through the relay device, so that the coverage of the communication system can be expanded. For example, a communication system supporting relay transmission can include a network device, a relay device and a terminal device. The relay device is, for example, a network controlled repeater (NCR). A link between the network device and the NCR can include a backhaul link, and a link between the NCR and the terminal device can include an access link. Through the backhaul link and the access link, communication between the network device and the terminal device can be implemented. In addition, the link between the network device and the NCR can also include a control link. Since the control link can be used to control the beam direction on the access link, it is very important to guarantee the communication quality on the control link.

[0003] SUMMARY

[0004] Embodiments of the present disclosure provide a communication method, device, medium and computer program product.

[0005] According to a first aspect of embodiments of the present disclosure, a communication method is provided, executed by a first network device on a satellite, and the method comprises: obtaining position information of a second network device on the ground; and performing frequency domain compensation on a signal on a control link between the first network device and the second network device according to ephemeris information of the satellite and the position information of the second network device.

[0006] According to a second aspect of embodiments of the present disclosure, a communication method is provided, executed by a first network device on a satellite, and the method comprises: obtaining position information of a second network device on the ground and frequency pre-compensation information of a downlink signal of the control link by the second network device, wherein one end of the control link is the first network device, and the other end of the control link is the second network device, and the downlink signal is a signal sent by the second network device to the first network device; and performing frequency domain compensation on an uplink signal of the control link according to ephemeris information of the satellite, the position information of the second network device and the frequency pre-compensation information, wherein the uplink signal is a signal sent by the first network device to the second network device.

[0007] According to a third aspect of the embodiments of the present disclosure, a communication method is provided, which is performed by a second network device on the ground, and the method comprises: obtaining ephemeris information of a satellite; and performing frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device.

[0008] According to a fourth aspect of the embodiments of the present disclosure, a communication method is provided, which is performed by a second network device on the ground, and the method comprises: obtaining ephemeris information of a satellite, and frequency pre-compensation information of an uplink signal of a control link by a first network device on the satellite, wherein one end of the control link is the first network device, the other end of the control link is the second network device, and the uplink signal is a signal sent by the first network device to the second network device; and performing frequency domain compensation on a downlink signal on the control link according to the ephemeris information of the satellite, position information of the second network device, and the frequency pre-compensation information.

[0009] According to a fifth aspect of the embodiments of the present disclosure, a first network device is provided, comprising: a processing module configured to obtain position information of a second network device on the ground; and perform frequency domain compensation on a signal on a control link between the first network device and the second network device according to ephemeris information of a satellite on which the first network is located and the position information of the second network device.

[0010] According to a sixth aspect of the embodiments of the present disclosure, a first network device is provided, comprising: a processing module configured to obtain position information of a second network device on the ground and frequency pre-compensation information of a downlink signal of a control link by the second network device, wherein one end of the control link is the first network device on a satellite, the other end of the control link is the second network device, and the downlink signal is a signal sent by the second network device to the first network device; and perform frequency domain compensation on an uplink signal of the control link according to ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information, wherein the uplink signal is a signal sent by the first network device to the second network device.

[0011] According to a seventh aspect of the embodiments of the present disclosure, a second network device is provided, comprising: a processing module configured to obtain ephemeris information of a satellite; and perform frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device on the ground.

[0012] According to an eighth aspect of the embodiments of the present disclosure, a second network device is provided, comprising: a processing module configured to acquire ephemeris information of a satellite and frequency pre-compensation information of an uplink signal of a control link by a first network device on the satellite, wherein one end of the control link is the first network device, the other end of the control link is the second network device on the ground, and the uplink signal is a signal sent by the first network device to the second network device; and the processing module is further configured to perform frequency domain compensation on a downlink signal on the control link according to the ephemeris information of the satellite, position information of the second network device, and the frequency pre-compensation information.

[0013] According to a ninth aspect of the embodiments of the present disclosure, a communication device is provided, comprising: one or more processors; and a memory coupled to the processors, the memory having stored thereon executable instructions that, when executed by the processors, cause the communication method according to any one of the first aspect, the second aspect, the third aspect, or the fourth aspect to be performed.

[0014] According to a tenth aspect of the embodiments of the present disclosure, a storage medium is provided, the storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the communication method according to any one of the first aspect, the second aspect, the third aspect, or the fourth aspect.

[0015] According to an eleventh aspect of the embodiments of the present disclosure, a computer program product is provided, comprising a computer program and / or instructions, which, when executed by a communication device, implement the communication method according to any one of the first aspect, the second aspect, the third aspect, or the fourth aspect.

[0016] The above technical solution can achieve at least the following beneficial technical effects:

[0017] The first network device acquires the position information of the second network device on the ground, and performs frequency domain compensation on a signal on a control link between the first network device on the satellite and the second network device on the ground according to the ephemeris information of the satellite on which the first network device is located and the position information of the second network device, which can ensure that the signal on the control link is correctly demodulated, thereby improving the communication quality of the control link. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following describes the drawings required for the embodiments, and the following drawings are only some embodiments of the present disclosure, and do not specifically limit the protection scope of the present disclosure.

[0019] FIG. 1A is an exemplary schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure.

[0020] FIG. 1B is a schematic diagram of a network architecture, according to an embodiment of the present disclosure.

[0021] FIG. 1C is a schematic diagram of another network architecture, according to an embodiment of the present disclosure.

[0022] FIG. 1D is a schematic diagram of a comparison of network architectures, according to an embodiment of the present disclosure.

[0023] FIG. 2A is a schematic diagram of interactions of a communication method, according to an embodiment of the present disclosure.

[0024] FIG. 2B is a schematic diagram of interactions of a communication method, according to an embodiment of the present disclosure.

[0025] FIG. 2C is a schematic diagram of interactions of a communication method, according to an embodiment of the present disclosure.

[0026] FIG. 2D is a schematic diagram of interactions of a communication method, according to an embodiment of the present disclosure.

[0027] FIG. 2E is a schematic diagram of interactions of a communication method, according to an embodiment of the present disclosure.

[0028] FIG. 2F is a schematic diagram of interactions of a communication method, according to an embodiment of the present disclosure.

[0029] FIG. 3A is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0030] FIG. 3B is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0031] FIG. 3C is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0032] FIG. 3D is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0033] FIG. 3E is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0034] FIG. 3F is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0035] FIG. 3G is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0036] FIG. 4A is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0037] FIG. 4B is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0038] FIG. 4C is a flowchart of a communication method, according to an embodiment of the present disclosure.

[0039] FIG. 4D is a flow diagram illustrating a communication method according to an embodiment of the present disclosure.

[0040] FIG. 4E is a flow diagram illustrating a communication method according to an embodiment of the present disclosure.

[0041] FIG. 4F is a flow diagram illustrating a communication method according to an embodiment of the present disclosure.

[0042] FIG. 4G is a flow diagram illustrating a communication method according to an embodiment of the present disclosure.

[0043] FIG. 5 is a flow diagram illustrating a communication method according to an embodiment of the present disclosure.

[0044] FIG. 6 is a structural diagram of a first network device according to an embodiment of the present disclosure.

[0045] FIG. 7 is a structural diagram of a second network device according to an embodiment of the present disclosure.

[0046] FIG. 8A is a structural diagram of a communication device according to an embodiment of the present disclosure.

[0047] FIG. 8B is a structural diagram of a chip according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0048] The embodiments of the present disclosure provide a communication method, device, medium and computer program product.

[0049] In a first aspect, the embodiments of the present disclosure provide a communication method, performed by a communication device, comprising: performing frequency domain compensation on a signal on a control link according to first information, one end of the control link being a first network device on a satellite, the other end of the control link being a second network device on the ground; wherein the first information comprises at least one of:

[0050] ephemeris information of the satellite;

[0051] position information of the second network device.

[0052] In the above embodiments, the signal on the control link with one end being the first network device on the satellite and the other end being the second network device on the ground is compensated in the frequency domain according to the first information comprising the ephemeris information of the satellite and / or the position information of the second network device, which can ensure that the signal on the control link is correctly demodulated in the scenario of high-speed movement of the satellite, thereby avoiding signal interruption and improving the communication quality of the control link.

[0053] In some embodiments of the first aspect, the first network device has the capability of receiving a control command sent by the second network device, and controlling the behavior of the transponder on the satellite according to the control command.

[0054] In the above embodiments, the first network device is defined from the capability dimension.

[0055] In some embodiments of the first aspect, the communication device is the first network device, and the method further includes receiving a first message sent by the second network device, the first message including location information of the second network device.

[0056] In the above embodiments, when the communication device is the first network device, the first message sent by the second network device can be received to obtain the location information of the second network device, so that the signal on the control link is compensated in the frequency domain.

[0057] In some embodiments of the first aspect, the first message is any one of the following:

[0058] a radio resource control (RRC) message;

[0059] a medium access control (MAC) control element (CE) message;

[0060] a broadcast message;

[0061] an operation, administration and maintenance (OAM) message.

[0062] In the above embodiments, when the communication device is the first network device, the second network device can send the location information of the second network device to the first network device through any one of the above messages.

[0063] In some embodiments of the first aspect, the communication device is the second network device, and the method further includes receiving a second message sent by the first network device, the second message including ephemeris information of the satellite, or receiving an OAM message sent by an operation, administration and maintenance (OAM) device, the OAM message including the ephemeris information of the satellite.

[0064] In the above embodiments, when the communication device is the second network device, the second message sent by the first network device can be received to obtain the ephemeris information of the satellite carrying the first network device, so that the signal on the control link is compensated in the frequency domain. Alternatively, when the communication device is the second network device, the ephemeris information of the satellite can be obtained from the OAM message, so that the signal on the control link is compensated in the frequency domain.

[0065] In some embodiments of the first aspect, in some embodiments, the second message is a capability report message.

[0066] In the above embodiments, the first network device can send the ephemeris information of the satellite carrying the first network device to the second network device through a capability report.

[0067] In some embodiments of the first aspect, in some embodiments, the frequency domain compensation of the signal on the control link according to the first information comprises: during the random access of the first network device to the second network device, frequency domain compensation of the signal on the control link according to the first information.

[0068] In the above embodiments, the frequency domain compensation of the signal on the control link according to the first information can be performed during the random access of the first network device to the second network device, so as to guarantee the communication quality and facilitate the successful access of the first network device to the second network device.

[0069] In some embodiments of the first aspect, in some embodiments, the frequency domain compensation of the signal on the control link according to the first information comprises: after the successful random access of the first network device to the second network device, frequency domain compensation of the signal on the control link according to the first information.

[0070] In the above embodiments, the frequency domain compensation of the signal on the control link according to the first information can be performed after the successful random access of the first network device to the second network device, so as to reduce the bit error rate on the control link and improve the communication quality.

[0071] In some embodiments of the first aspect, in some embodiments, the frequency domain compensation of the signal on the control link according to the first information comprises: determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device; and performing frequency domain compensation of the uplink signal and / or the downlink signal of the control link according to the first Doppler frequency offset information, the uplink signal being the signal sent by the first network device to the second network device, and the downlink signal being the signal sent by the second network device to the first network device.

[0072] In the above embodiments, the first Doppler frequency offset information corresponding to the control link is determined according to the ephemeris information of the satellite and the position information of the second network device, and the uplink signal of the control link is compensated in the frequency domain according to the first Doppler frequency offset information, so as to optimize the uplink communication quality.

[0073] In the above embodiment, the first Doppler frequency offset information corresponding to the control link is determined according to the ephemeris information of the satellite and the position information of the second network device, and the downlink signal of the control link is frequency domain compensated according to the first Doppler frequency offset information, so as to optimize the downlink communication quality.

[0074] In combination with some embodiments of the first aspect, in some embodiments, the first information further includes first frequency pre-compensation information, the first frequency pre-compensation information is carried in the first message, and the frequency domain compensation of the signal on the control link according to the first information includes: determining second Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the first frequency pre-compensation information; and frequency domain compensating the uplink signal of the control link according to the second Doppler frequency offset information, the uplink signal being the signal sent by the first network device to the second network device.

[0075] In the above embodiment, in the case that the downlink signal is pre-compensated by the second network device, the first network device can determine the second Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the first frequency pre-compensation information, and frequency domain compensate the uplink signal of the control link according to the second Doppler frequency offset information, so as to guarantee the uplink communication quality.

[0076] In combination with some embodiments of the first aspect, in some embodiments, the first information further includes second frequency pre-compensation information, the second frequency pre-compensation information is carried in the second message, and the frequency domain compensation of the signal on the control link according to the first information includes: determining third Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the second frequency pre-compensation information; and frequency domain compensating the downlink signal of the control link according to the third Doppler frequency offset information, the downlink signal being the signal sent by the second network device to the first network device.

[0077] In the above embodiment, in the case that the uplink signal is pre-compensated by the first network device, the second network device can determine the third Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the second frequency pre-compensation information, and frequency domain compensate the downlink signal of the control link according to the third Doppler frequency offset information, so as to guarantee the downlink communication quality.

[0078] In a second aspect, a communication method is provided. The method is performed by a first network device on a satellite, and includes: obtaining position information of a second network device on the ground; and performing frequency domain compensation on a signal on a control link between the first network device and the second network device according to ephemeris information of the satellite and the position information of the second network device.

[0079] In the above embodiments, the first network device on the satellite obtains the position information of the second network device on the ground, and performs frequency domain compensation on a signal on a control link with one end being the first network device on the satellite and the other end being the second network device on the ground according to ephemeris information of the satellite and the position information of the second network device. This can ensure that the signal on the control link is correctly demodulated in a scenario where the satellite moves at a high speed, thereby avoiding signal interruption and improving the communication quality of the control link.

[0080] In some embodiments of the second aspect, the first network device has the capability of receiving a control command sent by the second network device and controlling the behavior of the transponder on the satellite according to the control command.

[0081] In some embodiments of the second aspect, the position information of the second network device is obtained from at least one of the following messages sent by the second network device:

[0082] a radio resource control (RRC) message;

[0083] a medium access control (MAC) control element (CE);

[0084] a broadcast message;

[0085] an operation, administration and maintenance (OAM) message.

[0086] In some embodiments of the second aspect, the performing frequency domain compensation on a signal on a control link between the first network device and the second network device according to ephemeris information of the satellite and the position information of the second network device includes: determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device; and performing frequency domain compensation on an uplink signal and / or a downlink signal of the control link according to the first Doppler frequency offset information in a process of random access of the first network device to the second network device and / or after the random access of the first network device to the second network device is successful, the uplink signal being a signal sent by the first network device to the second network device, and the downlink signal being a signal sent by the second network device to the first network device.

[0087] In a third aspect, the embodiments of the present disclosure provide a communication method, executed by a first network device on a satellite, the method comprising: obtaining position information of a second network device on the ground and frequency pre-compensation information of the second network device for a downlink signal of a control link, wherein one end of the control link is the first network device and the other end of the control link is the second network device, and the downlink signal is a signal sent by the second network device to the first network device; and performing frequency domain compensation on an uplink signal of the control link according to ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information, wherein the uplink signal is a signal sent by the first network device to the second network device.

[0088] In the above embodiments, the first network device on the satellite obtains the position information of the second network device on the ground and the frequency pre-compensation information of the second network device for the downlink signal of the control link, and performs more accurate frequency domain compensation on the uplink signal of the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information of the second network device for the downlink signal of the control link, thereby improving the communication quality of the uplink of the control link.

[0089] In combination with some embodiments of the third aspect, in some embodiments, the first network device has the capability of receiving a control command sent by the second network device and controlling the behavior of a transponder on the satellite according to the control command.

[0090] In combination with some embodiments of the third aspect, in some embodiments, the frequency pre-compensation information and / or the position information of the second network device is obtained from at least one of the following messages sent by the second network device:

[0091] a radio resource control (RRC) message;

[0092] a medium access control (MAC) control element (CE);

[0093] a broadcast message;

[0094] an operation, administration and maintenance (OAM) message.

[0095] In some embodiments of the third aspect, in some embodiments, the frequency domain compensation on the uplink signal of the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information comprises: determining second Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information; and performing frequency domain compensation on the uplink signal according to the second Doppler frequency offset information in a process of random access of the first network device to the second network device and / or after the random access of the first network device to the second network device is successful.

[0096] In a fourth aspect, the embodiments of the present disclosure provide a communication method, executed by a second network device on the ground, comprising: obtaining ephemeris information of a satellite; and performing frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device.

[0097] In the above embodiments, the second network device on the ground obtains ephemeris information of a satellite, and performs frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device, which can ensure that the signal on the control link is correctly demodulated in a scenario where the satellite moves at a high speed, thereby avoiding signal interruption and improving the communication quality of the control link.

[0098] In some embodiments of the fourth aspect, in some embodiments, the ephemeris information of the satellite is obtained from at least one of the following messages:

[0099] a capability reporting message sent by the first network device;

[0100] an OAM message sent by an operation, maintenance, and management device.

[0101] In some embodiments of the fourth aspect, in some embodiments, the performing frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device comprises:

[0102] determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device;

[0103] In a process in which the first network device randomly accesses the second network device and / or after the first network device successfully randomly accesses the second network device, frequency domain compensation is performed on uplink signals and / or downlink signals of the control link according to the first Doppler frequency offset information, the uplink signals being signals sent by the first network device to the second network device, and the downlink signals being signals sent by the second network device to the first network device.

[0104] In a fifth aspect, an embodiment of the present disclosure provides a communication method, executed by a second network device on the ground, the method comprising: obtaining ephemeris information of a satellite and frequency pre-compensation information of an uplink signal of a control link by a first network device on the satellite, wherein one end of the control link is the first network device, the other end of the control link is the second network device, and the uplink signal is a signal sent by the first network device to the second network device; and performing frequency domain compensation on a downlink signal on the control link according to the ephemeris information of the satellite, position information of the second network device, and the frequency pre-compensation information.

[0105] In the above embodiment, the second network device on the ground obtains ephemeris information of a satellite and frequency pre-compensation information of an uplink signal of a control link by a first network device on the satellite, and performs more accurate frequency domain compensation on a downlink signal on the control link according to the ephemeris information of the satellite, position information of the second network device, and the frequency pre-compensation information, thereby improving the downlink communication quality of the control link.

[0106] In combination with some embodiments of the fifth aspect, in some embodiments, the frequency pre-compensation information and / or the ephemeris information of the satellite is obtained from at least one of the following messages:

[0107] a capability reporting message sent by the first network device;

[0108] an OAM message sent by an operation, maintenance and management device.

[0109] In combination with some embodiments of the fifth aspect, in some embodiments, the performing frequency domain compensation on the downlink signal on the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information comprises: determining third Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information; and in a process in which the first network device randomly accesses the second network device and / or after the first network device successfully randomly accesses the second network device, performing frequency domain compensation on the downlink signal according to the third Doppler frequency offset information.

[0110] In a sixth aspect, an embodiment of the present disclosure provides a communication device, the communication device comprising at least one of a transceiver module and a processing module; and wherein the communication device is configured to perform any of the optional implementation manners of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect.

[0111] In a seventh aspect, an embodiment of the present disclosure provides a first network device, the first network device comprising at least one of a transceiver module and a processing module; and wherein the first network device is configured to perform any of the optional implementation manners of the second aspect or the third aspect.

[0112] In an eighth aspect, an embodiment of the present disclosure provides a second network device, the second network device comprising at least one of a transceiver module and a processing module; and wherein the second network device is configured to perform any of the optional implementation manners of the fourth aspect or the fifth aspect.

[0113] In a ninth aspect, an embodiment of the present disclosure provides a communication device, the communication device comprising one or more processors; and wherein the communication device is configured to perform any of the optional implementation manners of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect.

[0114] In a tenth aspect, an embodiment of the present disclosure provides a communication system, the communication system comprising: a first network device and a second network device; wherein the first network device is configured to perform the method described in any of the optional implementation manners of the second aspect or the third aspect, and the second network device is configured to perform the method described in any of the optional implementation manners of the fourth aspect or the fifth aspect.

[0115] In an eleventh aspect, an embodiment of the present disclosure provides a storage medium, the storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the method described in any of the optional implementation manners of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect.

[0116] In a twelfth aspect, an embodiment of the present disclosure provides a program product, the program product, when executed by a communication device, causing the communication device to perform the method described in any of the optional implementation manners of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect.

[0117] In a thirteenth aspect, an embodiment of the present disclosure provides a computer program, when executed on a computer, causing the computer to perform the method described in any of the optional implementation manners of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect.

[0118] In a fourteenth aspect, the embodiments of the present disclosure provide a chip or chip system. The chip or chip system includes processing circuitry configured to perform the method described in any of the optional implementation manners of the first aspect, the second aspect, the third aspect, the fourth aspect, and the fifth aspect.

[0119] It can be understood that the communication device, the first network device, the second network device, the communication system, the storage medium, the program product, the computer program, the chip or the chip system are all used to execute the method proposed in the embodiments of the present disclosure. Therefore, the beneficial effects achieved thereby can refer to the beneficial effects in the corresponding method, which will not be described here again.

[0120] The embodiments of the present disclosure propose a communication method, device, medium and computer program product. In some embodiments, the terms of the communication method and the information processing method, the frequency domain compensation method of NCR satellite uplink, and the signal compensation method can be replaced with each other, the terms of the communication device and the information processing device, the frequency domain compensation device of NCR satellite uplink, and the signal compensation device can be replaced with each other, and the terms of the communication system and the information processing system, the frequency domain compensation system of NCR satellite uplink, and the signal compensation system can be replaced with each other.

[0121] The embodiments of the present disclosure are not exhaustive, but only illustrate some embodiments, and are not specific limitations on the protection scope of the present disclosure. In the case of no contradiction, each step in an embodiment can be implemented as an independent embodiment, and the steps can be combined arbitrarily, for example, the scheme after removing some steps in an embodiment can also be implemented as an independent embodiment, and the order of the steps in an embodiment can be exchanged arbitrarily, in addition, the optional implementation manners in an embodiment can be combined arbitrarily; in addition, the embodiments can be combined arbitrarily, for example, some or all steps of different embodiments can be combined arbitrarily, an embodiment can be combined with the optional implementation manners of other embodiments.

[0122] In each embodiment of the present disclosure, the terms and / or descriptions between the embodiments are consistent if there is no special description and logical conflict, and can be referred to each other, and the technical features in different embodiments can be combined to form a new embodiment according to their inherent logical relationship.

[0123] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments, and not as a limitation on the present disclosure.

[0124] In the embodiments of the present disclosure, an element expressed in singular form, such as "a", "an", "the", "said", "the aforementioned", "the foregoing", "this", and the like, unless otherwise specified, can represent "one and only one", or can represent "one or more", "at least one", and the like. For example, in the case of using an article such as "a", "an", "the" in English, the noun after the article can be understood as a singular expression, or can be understood as a plural expression.

[0125] In the embodiments of the present disclosure, "plurality" refers to two or more.

[0126] In some embodiments, the terms "at least one of", "one or more", "a plurality of", "multiple", and the like can be replaced with each other.

[0127] In some embodiments, the description manner such as "at least one of A, B", "A and / or B", "A in one case and B in another case", "responding to a case A, responding to another case B", and the like can include the following technical solutions according to the case: A is executed in some embodiments (A is executed regardless of B); B is executed in some embodiments (B is executed regardless of A); A and B are selectively executed in some embodiments (A and B are selected to be executed); A and B are executed in some embodiments (A and B are both executed). When there are more branches such as A, B, C, and the like, it is similar to the above.

[0128] In some embodiments, the description manner such as "A or B" and the like can include the following technical solutions according to the case: A is executed in some embodiments (A is executed regardless of B); B is executed in some embodiments (B is executed regardless of A); A and B are selectively executed in some embodiments (A and B are selected to be executed). When there are more branches such as A, B, C, and the like, it is similar to the above.

[0129] The prefix words of "first", "second" and the like in the embodiments of the present disclosure are merely used to distinguish different description objects, and do not constitute limitation on the position, order, priority, quantity or content of the description objects. The description objects are described in the claims or embodiments, and should not be construed as redundant limitation because of the use of the prefix words. For example, the description object is "field", and the ordinal words before "field" in "first field" and "second field" do not limit the position or order between "fields", and "first" and "second" do not limit whether the "fields" modified thereby are in the same message or not, nor limit the order of "first field" and "second field". For another example, the description object is "level", and the ordinal words before "level" in "first level" and "second level" do not limit the priority between "levels". For another example, the quantity of the description object is not limited by the ordinal words, and can be one or more. For example, "first device", wherein the quantity of "device" can be one or more. In addition, the objects modified by different prefix words can be the same or different, for example, the description object is "device", and "first device" and "second device" can be the same device or different devices, and the types thereof can be the same or different. For another example, the description object is "information", and "first information" and "second information" can be the same information or different information, and the contents thereof can be the same or different.

[0130] In some embodiments, "including A", "containing A", "for indicating A", "carrying A" can be interpreted as directly carrying A, or indirectly indicating A.

[0131] In some embodiments, the terms of "in response to", "in response to determining", "in the case of", "when", "when", "if", "if" and the like can be replaced with each other.

[0132] In some embodiments, the terms of "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", "above" and the like can be replaced with each other, and the terms of "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", "below" and the like can be replaced with each other.

[0133] In some embodiments, an apparatus or the like can be interpreted as an entity, and can also be interpreted as virtual, and the name thereof is not limited to the name described in the embodiments, and the terms "apparatus", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject" and the like can be replaced with each other.

[0134] In some embodiments, a "network" can be interpreted as an apparatus (for example, an access network device, a core network device, and the like) included in the network.

[0135] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)" and the like can be replaced with each other.

[0136] In some embodiments, the terms "terminal," "terminal device," "user equipment (UE)," "user terminal," "mobile station (MS)," "mobile terminal (MT)," "subscriber station," "mobile unit," "subscriber unit," "wireless unit," "remote unit," "mobile device," "wireless device," "wireless communication device," "remote device," "mobile subscriber station," "access terminal," "mobile terminal," "wireless terminal," "remote terminal," "handset," "user agent," "mobile client," "client," and so on can be replaced with each other.

[0137] In some embodiments, the access network device, the core network device, or the network device can be replaced with a terminal. For example, the embodiments of the present disclosure can also be applied to a structure in which communication between the access network device, the core network device, or the network device and the terminal is replaced with communication between a plurality of terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the terminal can also be configured to have all or part of the functions of the access network device. In addition, the terms "uplink," "downlink," and the like can also be replaced with terms corresponding to the inter-terminal communication (e.g., "side"). For example, the uplink channel, the downlink channel, and the like can be replaced with the side channel, and the uplink, the downlink, and the like can be replaced with the sidelink.

[0138] In some embodiments, the terminal can be replaced with the access network device, the core network device, or the network device. In this case, the access network device, the core network device, or the network device can also be configured to have all or part of the functions of the terminal.

[0139] In some embodiments, the data, information, etc. can be obtained in compliance with the laws and regulations of the country where the location is situated.

[0140] In some embodiments, the data, information, etc. can be obtained after obtaining the consent of the user.

[0141] In addition, each element, each row, or each column in the table of the embodiments of the present disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0142] FIG. 1A is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG. 1A, the communication system 100 can include a first network device 101 and a second network device 102.

[0143] In some embodiments, the first network device 101 is located on a satellite.

[0144] In some embodiments, the first network device 101 is a device that has the ability to receive a control command sent by the second network device and control the behavior of the transponder on the satellite according to the control command.

[0145] In some embodiments, the first network device 101 can refer to a terminal-like device as a terminal device to access the network. Alternatively, the first network device 101 is a network relay device or part of a network relay device. For example, the first network device 101 is an NCR or part of an NCR, for example, the first network device 101 is a mobile terminal in the NCR, i.e., NCR-MT (Mobile termination).

[0146] In some embodiments, the second network device 102 is located on the ground.

[0147] In some embodiments, the second network device 102 can include at least one of an access network device and a core network device.

[0148] Optionally, the second network device 102 is an access network device. Optionally, the access network device is at least one of a node or device that accesses a terminal to a wireless network, and the access network device can include at least one of an evolved NodeB (eNB) in a 5G communication system, a next generation eNB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an Open RAN, a Cloud RAN, a base station in other communication systems, an access node in a Wi-Fi system, but is not limited thereto.

[0149] In some embodiments, the second network device 102 is a base station. Optionally, the base station is at least one of a macro base station, a micro base station (also referred to as a small station), a relay station, an access point, a 5G base station or a future base station, a satellite, a Transmitting and Receiving Point (TRP), a Transmitting Point (TP), a mobile switching center, or other devices that perform a base station function in a communication system, etc., and the embodiments of the present disclosure are not limited thereto. For convenience of description, in all embodiments of the present disclosure, the device that provides a wireless communication function for the first network device is collectively referred to as a network device or a base station.

[0150] In some embodiments, the second network device 102 is a core network device. Optionally, the core network device can be one device including all or part of the first network element, the second network element, etc., or can be a plurality of devices or device groups including all or part of the first network element, the second network element, etc. respectively. The network element can be virtual or physical. The core network includes at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0151] In some embodiments, the technical solutions of the present disclosure can be applied to an Open RAN architecture, at this time, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0152] In some embodiments, the access network device can be composed of a central unit (CU) and a distributed unit (DU), where the CU can also be referred to as a control unit. The CU-DU structure can split the protocol layers of the access network device, and some of the functions of the protocol layers are controlled by the CU, and the remaining or all of the functions of the protocol layers are distributed in the DU and controlled by the CU. However, the present disclosure is not limited thereto.

[0153] It can be understood that the communication system described in the embodiments of the present disclosure is for more clearly illustrating the technical solutions of the embodiments of the present disclosure, and does not constitute a limitation on the technical solutions proposed by the embodiments of the present disclosure. It can be known by those skilled in the art that, as the system architecture evolves and new business scenarios appear, the technical solutions proposed by the embodiments of the present disclosure are also applicable to similar technical problems.

[0154] The following embodiments of the present disclosure can be applied to the communication system 100 shown in FIG. 1A or part of the subject, but are not limited thereto. The subjects shown in FIG. 1A are exemplary, and the communication system can include all or part of the subjects in FIG. 1A, or other subjects other than FIG. 1A. The number and form of each subject is arbitrary, each subject can be physical or virtual, the connection relationship between each subject is exemplary, each subject can not be connected or can be connected, the connection can be in any way, can be direct connection or indirect connection, can be wired connection or wireless connection.

[0155] Embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G New Radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (Bluetooth (registered trademark)), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine to Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), system using other communication methods, next-generation system expanded based thereon, and the like. Further, a plurality of systems can be applied in combination (for example, combination of LTE or LTE-A and 5G, and the like).

[0156] In some embodiments, the Non-Terrestrial Networks (NTN) payload is divided into transparent payload / transparent transmission and regenerative payload / regenerative transmission. In the case of transparent payload, the satellite only has the function of amplification and forwarding, and does not have the ability to process information. The structural diagram can be seen in FIG. IB. In the case of regenerative payload, the satellite has the ability to process information, such as gNB onboard.

[0157] In some embodiments, the evolution of satellite beams, for example, evolves from using a parabolic antenna to shoot a wide beam to using a phase array antenna to shoot multiple narrow beams at the same time. This can better coordinate network resources and improve anti-interference performance.

[0158] In some embodiments, for the management of beams, the beams on the satellite can be managed using the Operation Administration and Maintenance (OAM) method. The beam information can be updated every x seconds, and y hours of beam information can be transmitted at a time. However, the time interval of this adjustment method is long, and the pointing direction of the satellite beam cannot be dynamically adjusted.

[0159] In some embodiments, R18 proposes a Network Controlled Relay (NCR) that realizes the ability of beam indication on the basis of the traditional relay, that is, it can realize dynamic directional amplification and forwarding.

[0160] In some embodiments, referring to FIG. 1C, the NCR is composed of two parts, where the mobile termination (Network controlled repeater Mobile termination, NCR-MT) part can be used to receive control commands sent by a network device (e.g., a base station, a higher-layer network device), which are used to control the behavior of the forwarding device (Network controlled repeater-Forwarding, NCR-Fwd), i.e., the behavior on the backhaul link and the control link, such as controlling the beam indication direction, the opening and closing of the forwarding, etc. Among them, the backhaul link can be used for the communication between the forwarding device and the network device, and the access link can be used for the communication between the forwarding device and the user equipment, which achieves the purpose of communication between the user equipment and the network device. It can be understood that the network controlled repeater can also communicate with multiple user equipment. The above-mentioned higher-layer network device can include a mobility management network element, a session management network element, a user plane network element, and a data network (data network, DN), which are not limited by the present disclosure.

[0161] In some embodiments, continuing to refer to FIG. 1C, from the structure of the NCR, it can be understood that the NCR is also composed of two parts of the link, i.e., the control / backhaul link between the gNB and the NCR and the access link between the UE and the NCR.

[0162] In some embodiments, referring to FIG. 1B, from the NTN architecture, it can be seen that under the transparent payload architecture, the satellite also communicates through two parts of the link, including the feeder link between the satellite and the base station and the service link between the satellite and the UE.

[0163] In some embodiments, referring to FIG. 1B and FIG. 1C, if the NCR goes to the sky, the link between the satellite and the UE can be considered as the service / access link, and the link between the satellite and the gNB can be considered as the backhaul / feeder link. The only difference is that there is a control link between the satellite and the gNB, which is used at least to control the beam direction of the satellite on the service / access link.

[0164] In some embodiments, the definition of transparent payload in NTN is: radio frequency filtering, frequency conversion and amplification. Therefore, the waveform signal repeated by the transparent payload is un-changed. Please refer to the standard definition: “A transparent payload: Radio Frequency filtering, Frequency conversion and amplification. Hence, the waveform signal repeated by the payload is un-changed”, which will not be repeated here.

[0165] In some embodiments, referring to FIG. 1D, the feeder link can be understood as an optical fiber / cable in the ground network. The processing unit on the satellite can be understood as a part of the network, such as RRU (Remote Radio Unit) or AAU (Active Antenna Unit). The interface between BBU (Building Base band Unit) and RRU is CPRI, which is an internal interface of the network. Other interfaces can be used in the satellite network, but they are also internal interfaces, so the satellite and the ground station are bound and can be regarded as a whole. However, the Uu interface used by the NCR is open, which is conducive to the disengagement of the satellite and the ground network equipment. That is, the same satellite can serve different ground operators.

[0166] In some embodiments, in the process of establishing a communication connection between the UE located on the ground and the satellite and the base station located on the ground, the base station broadcasts the ephemeris information of the satellite, and the UE uses the ephemeris information of the satellite and the GNSS positioning position to perform frequency compensation on the access link, while the base station performs frequency compensation on the backhaul link.

[0167] In some embodiments, the NCR-MT can establish a control link with the base station through the Uu interface in the manner of a UE.

[0168] Therefore, different from the ground UE accessing the network through the satellite, in the case of the on-board NCR-MT accessing the ground base station, at this time, the high-speed moving on-board NCR-MT accesses the network as the UE, and who (the NCR-MT or the base station) performs the frequency domain compensation and according to which information to perform the compensation are problems to be solved. In this regard, the embodiment of the present disclosure proposes a frequency domain compensation method on a control link in the case of the NCR on-board. The embodiment of the present disclosure will be described in detail below.

[0169] FIG. 2A is an interaction schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 2A, the embodiment of the present disclosure relates to a communication method, taking the first network device 101 as an example of the communication device, and the method comprises:

[0170] In step S2101, the second network device 102 sends a first message to the first network device 101.

[0171] In some embodiments, the first network device receives the first message. For example, the first network device 101 receives the first message sent by the second network device 102.

[0172] The first network device is located on a satellite, that is, the first network device is carried on the satellite. The first network device is a terminal device or a network device that has the ability to receive a control command sent by the second network device and control the behavior of the transponder on the satellite according to the control command. For example, referring to FIG. 1C, the first network device is the NCR-MT. The NCR-MT can receive the control command sent by the second network device, and the control command is used to control the behavior of the transponder (NCR-Fwd), that is, the behavior on the backhaul link and the access link, such as controlling the beam direction, turning on and off the forwarding function, etc.

[0173] In addition, the second network device is located on the ground. The second network device is located on the ground, which means that the second network device is set on the earth. It can be understood that the second network device is not set on a flight platform or a spaceborne platform. The name of the second network device is not limited, which is, for example, a ground station, a ground base station, a reference point, etc.

[0174] In some embodiments, since the second network device knows its own position information, the first message sent by the second network device to the first network device can include the position information of the second network device.

[0175] Optionally, the position information of the second network device can include the specific position coordinates of the second network device itself, such as latitude and longitude coordinates.

[0176] Optionally, the location information of the second network device can comprise location information of a reference point, and the location coordinate of the second network device can be known through the location of the reference point and the location relationship between the reference point and the second network device, so as to guarantee the privacy of the location of the second network device. Optionally, the reference point can be an uplink time synchronization reference point. The uplink time synchronization reference point can be a certain position point on the ground. The location information of the reference point can be a latitude and longitude position information, GNSS position information, etc.

[0177] In some embodiments, the first message is used to indicate the location information of the second network device to the first network device.

[0178] In some embodiments, the location information of the second network device indicated by the first message is the latest location information of the second network device. Optionally, the location information of the second network device in the first message is used to update the location information of the second network device stored on the first network device.

[0179] In some embodiments, the name of the first message is not limited, which is, for example, location information, notification information, etc.

[0180] In some embodiments, the first message can be any one of a radio resource control (RRC) message, a medium access control control element (MAC CE) message, a broadcast message, and an operation and maintenance management (OAM) message.

[0181] It should be noted that the second network device is assumed to be a ground base station. If the first message is an OAM message, the generation subject of the first message (i.e., the OAM message) is not necessarily the ground base station, and the first message (i.e., the OAM message) can be generated by the core network and transmitted to the first network device through the ground base station. If the first message is any one of an RRC message, a MAC CE message, and a broadcast message, the first message (i.e., any one of the RRC message, the MAC CE message, and the broadcast message) can be generated by the ground base station.

[0182] In some embodiments, the first message can be an RRC message. The RRC can be a UE-specific RRC or a cell-common RRC. For example, if the RRC is a cell-common RRC, it can be transmitted in a broadcast manner, and its information element (IE) can be a serving cell common configuration (servingcellconfigCommon). For example, if the RRC is a UE-specific RRC, its IE can be a serving cell configuration (servingcellConfig).

[0183] In some embodiments, the first message is a broadcast message, for example, can be a message sent in a Master Information Block (MIB) or a System Information Block (SIB).

[0184] In some embodiments, the first network device receives the first message and obtains the position information of the second network device.

[0185] In step S2102, the first network device 101 performs frequency domain compensation on the signal on the control link according to the first information.

[0186] In some embodiments, the first information comprises at least one of:

[0187] Ephemeris information of the satellite;

[0188] Position information of the second network device;

[0189] First frequency pre-compensation information.

[0190] It should be explained that the ephemeris information of the satellite can comprise parameter information of the satellite, for example, comprising: orbital plane parameters, satellite horizontal parameters, etc. The orbital plane parameters are, for example, square root of semi-major axis, eccentricity, inclination of reference time, longitude of ascending node of the orbital plane, and argument of perigee, etc. The satellite horizontal parameters are, for example, mean anomaly of reference time and ephemeris reference time, etc. The position of the satellite can be determined according to the above-mentioned parameter information of the satellite, that is, the ephemeris information of the satellite is used to determine the position of the satellite.

[0191] It should be explained that since the first network device is located on the satellite, it can be considered that the ephemeris information of the satellite is known to the first network device.

[0192] The first frequency pre-compensation information refers to information of frequency pre-compensation of the downlink signal by the second network device based on the assumed position of the satellite. The name of the first frequency pre-compensation information is not limited, for example, is a frequency pre-compensation value of the downlink signal, a downlink signal compensation value, etc.

[0193] In some embodiments, the first frequency pre-compensation information can be sent by the second network device to the first network device in the first message. Of course, the first frequency pre-compensation information can also be sent by the second network device to the first network device in a non-first message, which is not limited by the present disclosure.

[0194] In some embodiments, the control link refers to a control link between the first network device on the satellite and the second network device on the ground. That is, one end of the control link is the first network device on the satellite, and the other end of the control link is the second network device on the ground. For example, referring to the control link between the NCR-MT and the second network device in FIG. 1C.

[0195] In some embodiments, the implementation of the frequency domain compensation of the signal on the control link by the first network device according to the first information can be that, in a process of random access of the second network device by the first network device, the first network device performs the frequency domain compensation of the signal on the control link according to the first information. After the random access of the second network device by the first network device is successful, the frequency domain compensation of the signal on the control link can be performed by the first network device or the second network device.

[0196] The signal on the control link includes an uplink signal and / or a downlink signal. The uplink signal is a signal sent by the first network device to the second network device. The downlink signal is a signal sent by the second network device to the first network device.

[0197] In some embodiments, the implementation of the frequency domain compensation of the signal on the control link by the first network device according to the first information can be that, after the random access of the second network device by the first network device is successful, the first network device performs the frequency domain compensation of the signal on the control link according to the first information. In the process of the random access of the second network device by the first network device, the frequency domain compensation of the signal on the control link can be performed by the first network device or the second network device.

[0198] In some embodiments, if the first information includes the ephemeris information of the satellite and the position information of the second network device, the implementation of the frequency domain compensation of the signal on the control link by the first network device according to the first information includes that the first network device determines first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device, and the first network device performs the frequency domain compensation of the uplink signal of the control link according to the first Doppler frequency offset information.

[0199] The calculation of the Doppler frequency offset can refer to related technologies, and will not be described in detail in the embodiments of the present disclosure. It should be understood that, in the case where the Doppler frequency offset is known, the Doppler frequency offset can be compensated to reduce or even eliminate the Doppler frequency offset, so as to correctly demodulate the signal and guarantee the communication quality.

[0200] In some embodiments, if the first information comprises ephemeris information of the satellite and position information of the second network device, the implementation of the first network device performing frequency domain compensation on the signal on the control link according to the first information comprises: the first network device determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device, and the first network device performing frequency domain compensation on the downlink signal of the control link according to the first Doppler frequency offset information.

[0201] In some embodiments, if the first information comprises ephemeris information of the satellite and position information of the second network device, the implementation of the first network device performing frequency domain compensation on the signal on the control link according to the first information comprises: the first network device determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device, and the first network device performing frequency domain compensation on the uplink signal and the downlink signal of the control link according to the first Doppler frequency offset information.

[0202] In some embodiments, if the first information comprises ephemeris information of the satellite, position information of the second network device, and first frequency pre-compensation information, the implementation of the first network device performing frequency domain compensation on the signal on the control link according to the first information comprises: the first network device determining second Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the first frequency pre-compensation information, and the first network device performing frequency domain compensation on the uplink signal of the control link according to the second Doppler frequency offset information.

[0203] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and the terms of “information”, “message”, “signal”, “signaling”, “report”, “configuration”, “indication”, “instruction”, “command”, “channel”, “parameter”, “domain”, “field”, “symbol”, “symbol”, “codebook”, “codeword”, “codepoint”, “bit”, “data”, “program”, “chip”, etc. can be replaced with each other.

[0204] In some embodiments, the terms of “uplink”, “uplink”, “physical uplink”, etc. can be replaced with each other, and the terms of “downlink”, “downlink”, “physical downlink”, etc. can be replaced with each other.

[0205] In some embodiments, "acquire", "obtain", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be replaced by each other, which can be interpreted as receiving from other subjects, acquiring from protocols, acquiring from higher layers, obtaining by self-processing, implementing autonomously, and the like.

[0206] In some embodiments, the terms "send", "transmit", "report", "issue", "transmit", "bidirectional transmission", "send and / or receive" and the like can be replaced by each other.

[0207] In some embodiments, the terms "certain", "preset", "preset", "set", "indicated", "certain", "arbitrary", "first" and the like can be replaced by each other. "Certain A", "preset A", "preset A", "set A", "indicated A", "certain A", "arbitrary A", "first A" can be interpreted as A specified in advance in protocols and the like, A obtained by setting, configuration, or indication, and the like, A specific, certain, arbitrary, or first A, and the like, but not limited thereto.

[0208] The communication method related to the embodiments of the present disclosure can include at least one of step S2101 and step S2102. For example, step S2101 can be implemented as an independent embodiment, and step S2102 can be implemented as an independent embodiment, but not limited thereto.

[0209] In some embodiments, the order of steps S2101 and S2102 can be exchanged or performed simultaneously.

[0210] In some embodiments, step S2101 is optional, and can be omitted or replaced in different embodiments.

[0211] In some embodiments, step S2102 is optional, and can be omitted or replaced in different embodiments.

[0212] In some embodiments, other optional implementations described before or after the description corresponding to FIG. 2A can be referred to.

[0213] FIG. 2B is an interaction diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 2B, the embodiments of the present disclosure relate to a communication method, taking the second network device 102 as an example, the above-mentioned method comprises:

[0214] Step S2201, the first network device 101 sends a second message to the second network device 102.

[0215] In some embodiments, the second network device receives the second message. For example, the second network device 102 receives the second message sent by the first network device 101.

[0216] The first network device is located on a satellite, i.e., the first network device is carried on the satellite. The first network device is a terminal device or a network device that has the capability of receiving a control command sent by the second network device and controlling the behavior of a transponder on the satellite according to the control command. For example, referring to FIG. 1C, the first network device is NCR-MT. The NCR-MT can receive a control command sent by the second network device, and the control command is used to control the behavior of the transponder (NCR-Fwd), i.e., the behavior on the backhaul link and the access link, such as controlling the beam direction, turning on and off the transponder function, and the like.

[0217] In addition, the second network device is located on the ground. The second network device located on the ground means that the second network device is arranged on the earth. It can be understood that the second network device is not arranged on a flight platform or a spaceborne platform. The name of the second network device is not limited, which is, for example, a ground station, a ground base station, a reference point, and the like.

[0218] In some embodiments, since the first network device is located on the satellite, it can be considered that the first network device knows the ephemeris information of the satellite. Then, the second message sent by the first network device to the second network device can include the ephemeris information of the satellite.

[0219] It should be explained that the ephemeris information of the satellite can include the parameter information of the satellite, for example, including: orbital plane parameters, satellite horizontal parameters, and the like. The orbital plane parameters are, for example, the square root of the semi-major axis, the eccentricity, the inclination of the reference time, the longitude of the orbital plane ascending node, and the perigee angle, and the like. The satellite horizontal parameters are, for example, the mean anomaly of the reference time and the ephemeris reference time, and the like. According to the above parameter information of the satellite, the position of the satellite can be determined, i.e., the ephemeris information of the satellite is used to determine the position of the satellite. The position of the satellite can be considered as the position of the first network device.

[0220] In some embodiments, the second message is used to report the ephemeris information of the satellite to the second network device.

[0221] In some embodiments, the ephemeris information of the satellite indicated by the second message is the latest satellite ephemeris information. Alternatively, the ephemeris information of the satellite in the second message is used to update the satellite ephemeris information stored on the second network device.

[0222] In some embodiments, the name of the second message is not limited, which is, for example, position information, notification information, and the like.

[0223] In some embodiments, the second message is a capability (e.g., NCR-MT capability) reporting message. The first network device can report the ephemeris information of the satellite to the second network device by means of capability reporting.

[0224] In some embodiments, the second network device receives the second message and obtains the ephemeris information of the satellite carrying the first network device.

[0225] In some embodiments, step S2201 can be replaced by that the second network device receives an OAM message sent by the operation and maintenance management device, and the OAM message includes the ephemeris information of the satellite. For example, the second network device obtains the ephemeris information of the satellite from the OAM message. The OAM message is generated by an OAM function module, for example, the operation and maintenance management device. For example, the OAM message is generated by a higher layer network.

[0226] In step S2202, the second network device 102 performs frequency domain compensation on the signal on the control link according to the first information.

[0227] In some embodiments, the first information includes at least one of the following:

[0228] the ephemeris information of the satellite;

[0229] the location information of the second network device;

[0230] the second frequency pre-compensation information.

[0231] It should be noted that the second network device knows its own location information. The location information of the second network device is, for example, the latitude and longitude coordinates.

[0232] Optionally, the location information of the second network device can include the location information of a reference point, and the location coordinates of the second network device can be known through the location of the reference point and the location relationship between the reference point and the second network device, so as to guarantee the privacy of the location of the second network device. Optionally, the reference point can be an uplink time synchronization reference point. The uplink time synchronization reference point can be a certain location point on the ground. The location information of the reference point can be a latitude and longitude location information, GNSS location information, etc.

[0233] The second frequency pre-compensation information refers to the information of the frequency pre-compensation of the uplink signal by the first network device based on the assumed location of the second network device. The name of the second frequency pre-compensation information is not limited, which is, for example, the frequency pre-compensation value of the uplink signal, the uplink compensation value, etc.

[0234] In some embodiments, the second frequency pre-compensation information can be sent by the first network device to the second network device in the second message. Of course, the second frequency pre-compensation information can also be sent by the first network device to the second network device in a message other than the second message, which is not limited in the present disclosure.

[0235] In some embodiments, the control link refers to a control link between the first network device on the satellite and the second network device on the ground. That is, one end of the control link is the first network device on the satellite, and the other end of the control link is the second network device on the ground. For example, refer to the control link between the NCR-MT and the second network device in FIG. 1C.

[0236] In some embodiments, the implementation of the second network device performing frequency domain compensation on the signal on the control link according to the first information can be that, in the process of the first network device randomly accessing the second network device, the second network device performs frequency domain compensation on the signal on the control link according to the first information. After the first network device successfully randomly accesses the second network device, the signal on the control link can be compensated by the second network device or the first network device.

[0237] The signal on the control link includes an uplink signal and / or a downlink signal. The uplink signal is a signal sent by the first network device to the second network device. The downlink signal is a signal sent by the second network device to the first network device.

[0238] In some embodiments, the implementation of the second network device performing frequency domain compensation on the signal on the control link according to the first information can be that, after the first network device successfully randomly accesses the second network device, the second network device performs frequency domain compensation on the signal on the control link according to the first information. In the process of the first network device randomly accessing the second network device, the signal on the control link can be compensated by the second network device or the first network device.

[0239] In some embodiments, if the first information includes ephemeris information of the satellite and position information of the second network device, the implementation of the second network device performing frequency domain compensation on the signal on the control link according to the first information includes that the second network device determines first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device, and the second network device performs frequency domain compensation on the uplink signal of the control link according to the first Doppler frequency offset information.

[0240] The calculation of the Doppler frequency offset can refer to related technologies, which are not described in detail in the embodiments of the present disclosure. It should be understood that, in the case of knowing the Doppler frequency offset, the Doppler frequency offset can be compensated to reduce or even eliminate the Doppler frequency offset, so as to correctly demodulate the signal and guarantee the communication quality.

[0241] In some embodiments, if the first information comprises ephemeris information of the satellite and position information of the second network device, the implementation of the second network device performing frequency domain compensation on the signal on the control link according to the first information comprises: the second network device determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device, and the second network device performing frequency domain compensation on the downlink signal of the control link according to the first Doppler frequency offset information.

[0242] In some embodiments, if the first information comprises ephemeris information of the satellite and position information of the second network device, the implementation of the second network device performing frequency domain compensation on the signal on the control link according to the first information comprises: the second network device determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device, and the second network device performing frequency domain compensation on the uplink signal and the downlink signal of the control link according to the first Doppler frequency offset information.

[0243] In some embodiments, if the first information comprises ephemeris information of the satellite, position information of the second network device, and second frequency pre-compensation information, the implementation of the second network device performing frequency domain compensation on the signal on the control link according to the first information comprises: the second network device determining third Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the second frequency pre-compensation information, and the second network device performing frequency domain compensation on the downlink signal of the control link according to the third Doppler frequency offset information.

[0244] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and the terms of “information”, “message”, “signal”, “signaling”, “report”, “configuration”, “indication”, “instruction”, “command”, “channel”, “parameter”, “domain”, “field”, “symbol”, “symbol”, “codebook”, “codeword”, “codepoint”, “bit”, “data”, “program”, “chip”, etc. can be replaced with each other.

[0245] In some embodiments, the terms of “uplink”, “uplink”, “physical uplink”, etc. can be replaced with each other, and the terms of “downlink”, “downlink”, “physical downlink”, etc. can be replaced with each other.

[0246] In some embodiments, "acquire", "obtain", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be replaced by each other, which can be interpreted as receiving from other subjects, acquiring from protocols, obtaining from higher layers, obtaining by processing oneself, implementing autonomously, and the like.

[0247] In some embodiments, the terms "send", "transmit", "report", "issue", "transmit", "bidirectional transmission", "send and / or receive" can be replaced by each other.

[0248] In some embodiments, the terms "certain", "preset", "preset", "set", "indicated", "certain", "arbitrary", "first", and the like can be replaced by each other. "Certain A", "preset A", "preset A", "set A", "indicated A", "certain A", "arbitrary A", "first A" can be interpreted as A specified in advance in protocols and the like, or A obtained by setting, configuring, or indicating, or A specific A, certain A, arbitrary A, or first A, but not limited thereto.

[0249] The communication method related to the embodiments of the present disclosure can include at least one of step S2201 and step S2202. For example, step S2201 can be implemented as an independent embodiment, and step S2202 can be implemented as an independent embodiment, but not limited thereto.

[0250] In some embodiments, the order of steps S2201 and S2202 can be exchanged or executed simultaneously.

[0251] In some embodiments, step S2201 is optional, and can be omitted or replaced in different embodiments.

[0252] In some embodiments, step S2202 is optional, and can be omitted or replaced in different embodiments.

[0253] In some embodiments, other optional implementations described before or after the corresponding description of FIG. 2B can be referred to.

[0254] FIG. 2C is an interaction diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 2C, the embodiments of the present disclosure relate to a communication method, which is executed by the communication system 100, and the above method comprises:

[0255] In step S2301, the second network device 102 sends the location information to the first network device 101.

[0256] It should be explained that the first network device is located on the satellite, i.e., the first network device is carried on the satellite. The first network device is a terminal device or a network device that has the capability of receiving a control command sent by the second network device and controlling the behavior of the transponder on the satellite according to the control command. For example, referring to FIG. 1C, the first network device is NCR-MT. The NCR-MT can receive a control command sent by the second network device, and the control command is used to control the behavior of the transponder (NCR-Fwd), i.e., control the behavior on the backhaul link and the access link, such as control of the beam direction, turning on and off of the forwarding function, and the like. That is, the first network device can be referred to as a terminal-like device.

[0257] It should also be explained that the second network device is located on the ground. The second network device is located on the ground, which means that the second network device is arranged on the earth. It can be understood that the second network device is not arranged on a flight platform or a spaceborne platform. The name of the second network device is not limited, which is, for example, a ground station, a ground base station, a reference point, and the like.

[0258] In some embodiments, the first network device receives the location information of the second network device.

[0259] In some embodiments, since the second network device knows its own location information, the second network device can send the location information of the second network device to the first network device.

[0260] Optionally, the location information of the second network device can include specific location coordinates of the second network device itself, such as latitude and longitude coordinates.

[0261] Optionally, the location information of the second network device can include the location information of a reference point, and the location coordinates of the second network device can be known through the location of the reference point and the location relationship between the reference point and the second network device, so that the privacy of the location of the second network device can be ensured. Optionally, the reference point can be an uplink time synchronization reference point. The uplink time synchronization reference point can be a certain location point on the ground. The location information of the reference point can be a latitude and longitude location information, GNSS location information, and the like.

[0262] In some embodiments, the location information of the second network device can be sent to the first network device in at least one of the following messages sent by the second network device:

[0263] a radio resource control (RRC) message;

[0264] a medium access control (MAC) control element (CE);

[0265] a broadcast message;

[0266] Operation, Administration and Maintenance, OAM, message.

[0267] For example, it is assumed that the second network device is a ground base station. The location information of the second network device can be included in the OAM message. The OAM message can be generated by the core network and transmitted to the first network device through the ground base station in a PDU. The RRC can be a UE-specific RRC or a cell-common RRC. For example, if the RRC is a cell-common RRC, the RRC can be transmitted by broadcasting, and the information element (IE) of the RRC can be a serving cell configCommon. For example, if the RRC is a UE-specific RRC, the IE of the RRC can be a serving cell config.

[0268] For example, it is assumed that the second network device is a ground base station. The location information of the second network device can be included in any one of the RRC, the MAC CE, and the broadcast message. The RRC, the MAC CE, and the broadcast message can be generated by the ground base station.

[0269] For example, the location information of the second network device can be included in a broadcast message, such as a message included in a master information block (MIB) or a system information block (SIB).

[0270] In step S2302, the first network device 101 determines first Doppler frequency offset information corresponding to the control link between the first network device and the second network device according to the ephemeris information of the satellite in which the first network device is located and the location information of the second network device.

[0271] It should be explained that the ephemeris information of the satellite can include parameter information of the satellite, such as orbital plane parameters and satellite horizontal parameters. The orbital plane parameters can include, for example, a square root of a semi-major axis, an eccentricity, an inclination at a reference time, a longitude of the ascending node of the orbital plane, and a perigee angle. The satellite horizontal parameters can include, for example, mean anomalies at a reference time and ephemeris reference time. According to the above parameter information of the satellite, the position of the satellite can be determined, that is, the ephemeris information of the satellite is used to determine the position of the satellite.

[0272] It should be noted that since the first network device is located on the satellite, the ephemeris information of the satellite can be considered to be known by the first network device. The position information of the satellite can be equivalent to the position information of the first network device.

[0273] In some embodiments, the control link refers to a control link between the first network device on the satellite and the second network device on the ground. That is, one end of the control link is the first network device on the satellite, and the other end of the control link is the second network device on the ground. For example, refer to the control link between the NCR-MT and the second network device in FIG. 1C.

[0274] In some embodiments, the first network device can determine the first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device, and the first Doppler frequency offset information is used for the first network device to perform frequency domain compensation on the signal on the control link.

[0275] The calculation method of the Doppler frequency offset can be referred to related technologies, and the embodiments of the present disclosure do not describe in detail. It should be understood that in the case of knowing the Doppler frequency offset, the frequency offset compensation can be performed to reduce or even eliminate the Doppler frequency offset, so as to correctly demodulate the signal and guarantee the communication quality.

[0276] In step S2303, the first network device 101 performs frequency domain compensation on the signal on the control link according to the first Doppler frequency offset information.

[0277] In some embodiments, the first network device can perform frequency domain compensation on the signal on the control link in the process of the first network device randomly accessing the second network device and / or after the first network device successfully randomly accesses the second network device.

[0278] In some embodiments, the signal on the control link includes uplink signal and / or downlink signal. The uplink signal is the signal sent by the first network device to the second network device. The downlink signal is the signal sent by the second network device to the first network device.

[0279] In some embodiments, the first network device performs frequency domain compensation on the downlink signal of the control link according to the first Doppler frequency offset information.

[0280] In some embodiments, the first network device performs frequency domain compensation on the uplink signal of the control link according to the first Doppler frequency offset information.

[0281] In some embodiments, the first network device performs frequency domain compensation on the uplink signal and the downlink of the control link according to the first Doppler frequency offset information.

[0282] The communication method related to the embodiments of the present disclosure can include at least one of steps S2301-S2303. For example, step S2302 can be implemented as an independent embodiment, and step S2303 can be implemented as an independent embodiment, but is not limited thereto.

[0283] In some embodiments, the order between any two of steps S2301-S2303 can be exchanged or executed simultaneously.

[0284] In some embodiments, step S2301 is optional, and can be omitted or replaced in different embodiments.

[0285] In some embodiments, step S2302 is optional, and can be omitted or replaced in different embodiments.

[0286] In some embodiments, step S2303 is optional, and can be omitted or replaced in different embodiments.

[0287] In some embodiments, other optional implementations described before or after the description corresponding to FIG. 2C can be referred to.

[0288] FIG. 2D is an interaction schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 2D, the embodiments of the present disclosure relate to a communication method, which is executed by the communication system 100, and the above method includes:

[0289] In step S2401, the second network device 102 sends the location information and the frequency pre-compensation information of the second network device to the downlink signal of the control link to the first network device 101.

[0290] It should be explained that the first network device is located on the satellite, i.e., the first network device is carried on the satellite. The first network device is a terminal device or a network device with the ability to receive the control command sent by the second network device and control the behavior of the transponder on the satellite. For example, referring to FIG. 1C, the first network device is NCR-MT. NCR-MT can receive the control command sent by the second network device, and the control command is used to control the behavior of the transponder (NCR-Fwd), i.e., the behavior on the backhaul link and the access link, such as controlling the beam direction, turning on and off the forwarding function, etc. That is, the first network device can be called a terminal-like device.

[0291] It should also be explained that the second network device is located on the ground. The second network device being located on the ground means that the second network device is disposed on the earth. It can be understood that the second network device is not disposed on a flight platform or a spaceborne platform. The name of the second network device is not limited, which is, for example, a ground station, a ground base station, a reference point, and the like.

[0292] In some embodiments, the first network device receives position information of the second network device and frequency pre-compensation information of the second network device for a downlink signal of the control link.

[0293] In some embodiments, since the second network device knows its own position information, the second network device can send the position information of the second network device to the first network device.

[0294] Optionally, the position information of the second network device can include specific position coordinates of the second network device itself, such as latitude and longitude coordinates.

[0295] Optionally, the position information of the second network device can include position information of a reference point, and the position coordinates of the second network device can be known through the position of the reference point and the position relationship between the reference point and the second network device, so that the privacy of the position of the second network device can be ensured. Optionally, the reference point can be an uplink time synchronization reference point. The uplink time synchronization reference point can be a certain position point on the ground. The position information of the reference point can be a latitude and longitude position information, GNSS position information, and the like.

[0296] In some embodiments, the frequency pre-compensation information of the second network device for the downlink signal of the control link means information of frequency pre-compensation of the second network device for the downlink signal based on the assumed satellite position. The name of the frequency pre-compensation information is not limited, which is, for example, a frequency pre-compensation value of the downlink signal, a downlink signal compensation value, and the like.

[0297] In some embodiments, the control link means a control link between the first network device on the satellite and the second network device on the ground. That is, one end of the control link is the first network device on the satellite, and the other end of the control link is the second network device on the ground. For example, refer to the control link between the NCR-MT and the second network device in FIG. 1C.

[0298] In some embodiments, the signal on the control link includes an uplink signal and / or a downlink signal. The uplink signal is a signal sent by the first network device to the second network device. The downlink signal is a signal sent by the second network device to the first network device.

[0299] In some embodiments, the location information of the second network device and the frequency pre-compensation information of the second network device to the downlink signal of the control link can be sent to the first network device in at least one of the following messages sent by the second network device:

[0300] a radio resource control (RRC) message;

[0301] a medium access control (MAC) control element (CE);

[0302] a broadcast message;

[0303] an operation, administration and maintenance (OAM) message.

[0304] For example, assuming that the second network device is a ground base station. The location information of the second network device can be included in an OAM message. The OAM message can be generated by the core network and transmitted to the first network device through the ground base station. The RRC can be a UE-specific RRC or a cell-common RRC. For example, if the RRC is a cell-common RRC, it can be transmitted by broadcasting and its information element (IE) can be serving cell configCommon. If the RRC is a UE-specific RRC, its IE can be serving cellConfig.

[0305] For example, assuming that the second network device is a ground base station. The location information of the second network device and the frequency pre-compensation information of the second network device to the downlink signal of the control link can be included in any one of the RRC, the MAC CE, and the broadcast message. Any one of the RRC, the MAC CE, and the broadcast message can be generated by the ground base station.

[0306] For example, the location information of the second network device and the frequency pre-compensation information of the second network device to the downlink signal of the control link can be included in a broadcast message, such as a message included in a master information block (MIB) or a system information block (SIB).

[0307] In step S2402, the first network device 101 determines the second Doppler frequency offset information corresponding to the control link between the first network device and the second network device according to the ephemeris information of the satellite on which the first network device is located, the position information of the second network device, and the frequency pre-compensation information of the downlink signal.

[0308] It should be explained that the ephemeris information of the satellite can include parameter information of the satellite, for example, including orbital plane parameters, satellite horizontal parameters, etc. The orbital plane parameters are, for example, the square root of the semi-major axis, the eccentricity, the inclination at the reference time, the longitude of the ascending node of the orbital plane, and the argument of perigee, etc. The satellite horizontal parameters are, for example, the mean anomaly at the reference time and the ephemeris reference time, etc. The position of the satellite can be determined according to the above-mentioned parameter information of the satellite, that is, the ephemeris information of the satellite is used to determine the position of the satellite.

[0309] It should be noted that since the first network device is located on the satellite, it is considered that the first network device knows the ephemeris information of the satellite. The position information of the satellite can be equivalent to the position information of the first network device.

[0310] In some embodiments, the first network device can determine the second Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information of the downlink signal, and the second Doppler frequency offset information is used for the first network device to perform frequency domain compensation on the uplink signal of the control link.

[0311] The calculation method of the Doppler frequency offset can be referred to related technologies, and the embodiments of the present disclosure do not describe it in detail. It should be understood that in the case where the Doppler frequency offset is known, the frequency offset compensation can be performed on this case to reduce or even eliminate the Doppler frequency offset, so as to correctly demodulate the signal and guarantee the communication quality.

[0312] In step S2403, the first network device 101 performs frequency domain compensation on the uplink signal of the control link according to the second Doppler frequency offset information.

[0313] In some embodiments, the first network device can perform frequency domain compensation on the uplink signal of the control link in the process of random access of the first network device to the second network device and / or after the random access of the first network device to the second network device is successful.

[0314] In some embodiments, the first network device can perform frequency domain compensation on the uplink signal of the control link according to the second Doppler frequency offset information in the process of random access of the first network device to the second network device.

[0315] In some embodiments, the first network device can perform frequency domain compensation on the uplink signal of the control link according to the second Doppler frequency offset information after the random access of the first network device to the second network device is successful.

[0316] The communication method related to the embodiments of the present disclosure can include at least one of steps S2401-S2403. For example, step S2402 can be implemented as an independent embodiment, and step S2403 can be implemented as an independent embodiment, but is not limited thereto.

[0317] In some embodiments, the order between any two of steps S2401-S2403 can be exchanged or executed simultaneously.

[0318] In some embodiments, step S2401 is optional, and can be omitted or replaced in different embodiments.

[0319] In some embodiments, step S2402 is optional, and can be omitted or replaced in different embodiments.

[0320] In some embodiments, step S2403 is optional, and can be omitted or replaced in different embodiments.

[0321] In some embodiments, other optional implementations described before or after the description corresponding to FIG. 2D can be referred to.

[0322] FIG. 2E is an interaction schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 2E, the embodiments of the present disclosure relate to a communication method, which is executed by the communication system 100, and the above method includes:

[0323] In step S2501, the first network device 101 sends the ephemeris information of the satellite where it is located to the second network device 102.

[0324] It should be explained that the first network device is located on the satellite, that is, the first network device is carried on the satellite. The first network device is a terminal device or a network device with the ability to receive the control command sent by the second network device and control the behavior of the transponder on the satellite according to the control command. For example, referring to FIG. 1C, the first network device is NCR-MT. The NCR-MT can receive the control command sent by the second network device, and the control command is used to control the behavior of the transponder (NCR-Fwd), that is, the behavior on the backhaul link and the access link, such as controlling the beam direction, turning on and off the forwarding function, etc. That is, the first network device can be called a terminal-like device.

[0325] It should also be explained that the second network device is located on the ground. The second network device is located on the ground means that the second network device is set on the earth. It can be understood that the second network device is not set on a flight platform or a spaceborne platform. The name of the second network device is not limited, for example, it is a ground station, a ground base station, a reference point, and the like.

[0326] In some embodiments, since the first network device is located on the satellite, it can be considered that the first network device knows the ephemeris information of the satellite. Then, the first network device can send the ephemeris information of the satellite to the second network device.

[0327] In some embodiments, the second network device receives the ephemeris information of the satellite.

[0328] It should be explained that the ephemeris information of the satellite can include parameter information of the satellite, for example, including: orbit plane parameters, satellite horizontal parameters, and the like. The orbit plane parameters are, for example, the square root of the semi-major axis, the eccentricity, the inclination of the reference time, the longitude of the orbit plane ascending node, and the perigee angle, and the like. The satellite horizontal parameters are, for example, the mean anomaly of the reference time and the ephemeris reference time, and the like. According to the above-mentioned parameter information of the satellite, the position of the satellite can be determined, that is, the ephemeris information of the satellite is used to determine the position of the satellite. And the position of the satellite can be considered equivalent to the position of the first network device.

[0329] In some embodiments, the first network device can include the ephemeris information of the satellite in the capability (for example, NCR-MT capability) reporting message sent to the second network device. The first network device can report the ephemeris information of the satellite to the second network device through the capability reporting mode.

[0330] In some embodiments, step S2501 can be replaced by the second network device receiving an OAM message sent by the operation and maintenance management device, and the OAM message includes the ephemeris information of the satellite. For example, the second network device obtains the ephemeris information of the satellite from the OAM message. The OAM message is generated by an OAM function module, for example, an operation and maintenance management device. For example, the OAM message is generated by a high-level network.

[0331] In step S2502, the second network device 102 determines the first Doppler frequency offset information corresponding to the control link between the first network device and the second network device according to the ephemeris information of the satellite and the position information of the second network device.

[0332] It should be noted that the second network device knows its own position information. The position information of the second network device is, for example, the latitude and longitude coordinates.

[0333] Optionally, the location information of the second network device can comprise location information of a reference point, and the location coordinate of the second network device can be determined according to the location of the reference point and the location relationship between the reference point and the second network device, so as to protect the privacy of the location of the second network device. Optionally, the reference point can be an uplink time synchronization reference point. The uplink time synchronization reference point can be a certain position point on the ground. The location information of the reference point can be a latitude and longitude position information, GNSS position information, etc.

[0334] In some embodiments, the control link refers to a control link between the first network device on the satellite and the second network device on the ground. That is, one end of the control link is the first network device on the satellite, and the other end of the control link is the second network device on the ground. For example, referring to the control link between the NCR-MT and the second network device in FIG. 1C.

[0335] In some embodiments, the second network device can determine the first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the location information of the second network device, and the first Doppler frequency offset information is used for the second network device to perform frequency domain compensation on the signal on the control link.

[0336] Wherein, the calculation method of the Doppler frequency offset can refer to the related art, and the embodiments of the present disclosure will not be described in detail. It should be understood that, in the case of knowing the Doppler frequency offset, the frequency offset compensation can be performed to reduce or even eliminate the Doppler frequency offset, so as to correctly demodulate the signal and protect the communication quality.

[0337] In step S2503, the second network device 102 performs frequency domain compensation on the signal on the control link according to the first Doppler frequency offset information.

[0338] In some embodiments, the second network device can perform frequency domain compensation on the signal on the control link in the process that the first network device randomly accesses the second network device and / or after the first network device successfully randomly accesses the second network device.

[0339] In some embodiments, the signal on the control link comprises uplink signal and / or downlink signal. The uplink signal is the signal sent by the first network device to the second network device. The downlink signal is the signal sent by the second network device to the first network device.

[0340] In some embodiments, the second network device performs frequency domain compensation on the downlink signal of the control link according to the first Doppler frequency offset information.

[0341] In some embodiments, the second network device performs frequency domain compensation on the uplink signal of the control link according to the first Doppler frequency offset information.

[0342] In some embodiments, the second network device performs frequency domain compensation on the uplink signal and the downlink of the control link according to the first Doppler frequency offset information.

[0343] The communication method according to the embodiments of the present disclosure can comprise at least one of steps S2501-S2503. For example, step S2502 can be implemented as an independent embodiment, and step S2503 can be implemented as an independent embodiment, but is not limited thereto.

[0344] In some embodiments, the order between any two of steps S2501-S2503 can be exchanged or performed simultaneously.

[0345] In some embodiments, step S2501 is optional, and can be omitted or replaced in different embodiments.

[0346] In some embodiments, step S2502 is optional, and can be omitted or replaced in different embodiments.

[0347] In some embodiments, step S2503 is optional, and can be omitted or replaced in different embodiments.

[0348] In some embodiments, other optional implementations described before or after the description corresponding to FIG. 2E can be referred to.

[0349] FIG. 2F is an interaction schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 2F, the embodiments of the present disclosure relate to a communication method, which is performed by the communication system 100, and the above method comprises:

[0350] In step S2601, the first network device 101 sends the ephemeris information of the satellite where the first network device is located and the frequency pre-compensation information of the first network device to the second network device 102.

[0351] It should be explained that the first network device is located on the satellite, i.e., the first network device is carried on the satellite. The first network device is a terminal device or a network device with the ability to receive the control command sent by the second network device and control the behavior of the transponder on the satellite according to the control command. For example, referring to FIG. 1C, the first network device is NCR-MT. The NCR-MT can receive the control command sent by the second network device, and the control command is used to control the behavior of the transponder (NCR-Fwd), i.e., the behavior on the backhaul link and the access link, such as controlling the beam direction, turning on and off the forwarding function, etc. That is, the first network device can be called a terminal-like device.

[0352] It should also be explained that the second network device is located on the ground. The second network device is located on the ground means that the second network device is disposed on the earth. It can be understood that the second network device is not disposed on a flight platform or a spaceborne platform. The name of the second network device is not limited, which is, for example, a ground station, a ground base station, a reference point, and the like.

[0353] In some embodiments, since the first network device is located on the satellite, it can be considered that the first network device knows the ephemeris information of the satellite. Then, the first network device can send the ephemeris information of the satellite to the second network device. The position information of the satellite is equivalent to the position information of the first network device.

[0354] In some embodiments, the second network device receives the ephemeris information of the satellite.

[0355] It should be explained that the ephemeris information of the satellite can include parameter information of the satellite, for example, including: orbit plane parameters, satellite horizontal parameters, and the like. The orbit plane parameters are, for example, the square root of the semi-major axis, the eccentricity, the inclination of the reference time, the longitude of the orbit plane ascending node, and the perigee angle, and the like. The satellite horizontal parameters are, for example, the mean anomaly of the reference time and the ephemeris reference time, and the like. According to the above-mentioned parameter information of the satellite, the position of the satellite can be determined, that is, the ephemeris information of the satellite is used to determine the position of the satellite. And the position of the satellite can be considered equivalent to the position of the first network device.

[0356] In some embodiments, the frequency pre-compensation information of the first network device to the frequency of the uplink signal of the control link means the frequency pre-compensation information of the first network device to the uplink signal based on the assumed position of the second network device. The name of the second frequency pre-compensation information is not limited, which is, for example, the frequency pre-compensation value of the uplink signal, the uplink compensation value, and the like.

[0357] In some embodiments, the control link means the control link between the first network device on the satellite and the second network device on the ground. That is, one end of the control link is the first network device on the satellite, and the other end of the control link is the second network device on the ground. For example, referring to the control link between the NCR-MT and the second network device in FIG. 1C.

[0358] In some embodiments, the first network device can include the ephemeris information of the satellite and the frequency pre-compensation information of the first network device to the uplink signal of the control link in the capability (for example, NCR-MT capability) reporting message sent to the second network device. The first network device can report the ephemeris information of the satellite and the frequency pre-compensation information of the first network device to the uplink signal of the control link to the second network device by the capability reporting manner.

[0359] In some embodiments, the second network device can receive an OAM message sent by the operation and maintenance management device, and the OAM message comprises ephemeris information of the satellite. For example, the second network device obtains the ephemeris information of the satellite from the OAM message. The OAM message is generated by an OAM function module, for example, the operation and maintenance management device. For example, the OAM message is generated by a high-level network.

[0360] In step S2602, the second network device 102 determines third Doppler frequency offset information corresponding to the control link between the first network device and the second network device according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information of the uplink signal.

[0361] It should be noted that the second network device knows its own position information. For example, the position information of the second network device comprises latitude and longitude coordinates.

[0362] Optionally, the position information of the second network device can comprise position information of a reference point. The position coordinates of the second network device can be obtained by the position of the reference point and the positional relationship between the reference point and the second network device, so as to protect the privacy of the position of the second network device. Optionally, the reference point can be an uplink time synchronization reference point. The uplink time synchronization reference point can be a certain position point on the ground. The position information of the reference point can be a latitude and longitude position information, GNSS position information, etc.

[0363] In some embodiments, the second network device can determine the third Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information of the uplink signal. The third Doppler frequency offset information is used for frequency domain compensation of the downlink signal of the control link by the second network device.

[0364] It should be understood that, in the case of knowing the Doppler frequency offset, frequency offset compensation can be performed on this case to reduce or even eliminate the Doppler frequency offset, so as to correctly demodulate the signal and protect the communication quality.

[0365] In step S2603, the second network device 102 performs frequency domain compensation on the downlink signal of the control link according to the third Doppler frequency offset information.

[0366] In some embodiments, the second network device can perform frequency domain compensation on the downlink signal of the control link in the process of random access of the first network device to the second network device and / or after the random access of the first network device to the second network device is successful.

[0367] In some embodiments, the second network device performs frequency domain compensation on the downlink signal of the control link according to the third Doppler frequency offset information in a process in which the first network device randomly accesses the second network device.

[0368] In some embodiments, the second network device performs frequency domain compensation on the downlink signal of the control link according to the third Doppler frequency offset information after the first network device successfully randomly accesses the second network device.

[0369] The communication method related to the embodiments of the present disclosure can include at least one of steps S2601-S2603. For example, step S2602 can be implemented as an independent embodiment, and step S2603 can be implemented as an independent embodiment, but is not limited thereto.

[0370] In some embodiments, the order between any two of steps S2601-S2603 can be exchanged or executed simultaneously.

[0371] In some embodiments, step S2601 is optional, and can be omitted or replaced in different embodiments.

[0372] In some embodiments, step S2602 is optional, and can be omitted or replaced in different embodiments.

[0373] In some embodiments, step S2603 is optional, and can be omitted or replaced in different embodiments.

[0374] In some embodiments, other optional implementations can be described before or after the description of Figure 2F.

[0375] Figure 3A is a flow diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 3A, the embodiments of the present disclosure relate to a communication method performed by a first network device, and the above method includes:

[0376] Step S3101, receiving a first message.

[0377] Optional implementations of step S3101 can refer to optional implementations of step S2101 of Figure 2A and other related parts in the embodiments related to Figure 2A, which will not be described here.

[0378] In some embodiments, the first network device 101 receives the first message sent by the second network device 102, but is not limited thereto, and can also receive the first message sent by other subjects.

[0379] In some embodiments, the first network device 101 obtains the first message specified by the protocol.

[0380] In some embodiments, the first network device 101 obtains the first message from upper layer(s).

[0381] In some embodiments, the first network device 101 processes to obtain the first message.

[0382] In some embodiments, the step S3101 is omitted, and the first network device 101 autonomously implements the function indicated by the first message, or the function is default or default.

[0383] In step S3102, the first Doppler frequency offset information corresponding to the control link is determined according to the ephemeris information of the satellite and the position information of the second network device.

[0384] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in FIG. 2A and other associated parts in the embodiments involved in FIG. 2A, which will not be repeated here.

[0385] In step S3103, the uplink signal of the control link is compensated in the frequency domain according to the first Doppler frequency offset information.

[0386] The optional implementation of step S3103 can refer to the optional implementation of step S2102 in FIG. 2A and other associated parts in the embodiments involved in FIG. 2A, which will not be repeated here.

[0387] In step S3104, the downlink signal of the control link is compensated in the frequency domain according to the first Doppler frequency offset information.

[0388] The optional implementation of step S3104 can refer to the optional implementation of step S2102 in FIG. 2A and other associated parts in the embodiments involved in FIG. 2A, which will not be repeated here.

[0389] The communication method involved in the embodiments of the present disclosure can include at least one of steps S3101-S3104. For example, step S3102 can be implemented as an independent embodiment, step S3103 can be implemented as an independent embodiment, step S3104 can be implemented as an independent embodiment, step S3102 and step S3103 can be implemented as independent embodiments, and step S3102 and step S3104 can be implemented as independent embodiments, but not limited thereto.

[0390] In some embodiments, the order of any two steps among steps S3101-S3104 can be exchanged or executed simultaneously.

[0391] In some embodiments, steps S3101, S3103 and S3104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0392] In some embodiments, steps S3101, S3102 and S3104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0393] In some embodiments, steps S3101 to S3103 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0394] In some embodiments, steps S3101 and S3104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0395] In some embodiments, steps S3101 and S3103 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0396] FIG. 3B is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 3B, the embodiments of the present disclosure relate to a communication method, which is performed by a first network device side, and the above method comprises the following steps:

[0397] In step S3201, a first message is received.

[0398] The optional implementation of step S3201 can refer to the optional implementation of step S2101 in FIG. 2A, the optional implementation of step S3101 in FIG. 3A, and other associated parts in the embodiments related to FIG. 2A and FIG. 3A, which will not be described here.

[0399] In step S3202, second Doppler frequency offset information corresponding to the control link is determined according to ephemeris information of the satellite, position information of the second network device, and first frequency pre-compensation information.

[0400] The optional implementation of step S3202 can refer to the optional implementation of step S2102 in FIG. 2A, and other associated parts in the embodiments related to FIG. 2A, which will not be described here.

[0401] In step S3203, the uplink signal of the control link is compensated in the frequency domain according to the second Doppler frequency offset information.

[0402] The optional implementation of step S3203 can refer to the optional implementation of step S2102 in FIG. 2A, and other associated parts in the embodiments related to FIG. 2A, which will not be described here.

[0403] The communication method related to the embodiments of the present disclosure can include at least one of steps S3201-S3203. For example, step S3202 can be implemented as an independent embodiment, step S3203 can be implemented as an independent embodiment, and steps S3202 and S3203 can be implemented as independent embodiments, but are not limited thereto.

[0404] In some embodiments, the order between any two of steps S3201-S3203 can be exchanged or performed simultaneously.

[0405] In some embodiments, steps S3201 and S3203 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0406] In some embodiments, steps S3201 and S3202 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0407] In some embodiments, step S3201 is optional, and this step can be omitted or replaced in different embodiments.

[0408] In some embodiments, step S3203 can be combined with step S3104 of FIG. 3A.

[0409] FIG. 3C is a flow diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 3C, the embodiments of the present disclosure relate to a communication method, which is performed by a first network device side, and the above method includes:

[0410] Step S3301, receiving a first message.

[0411] Optional implementation of step S3301 can refer to optional implementation of step S2101 of FIG. 2A, step S3101 of FIG. 3A, and other associated parts in the embodiments related to FIG. 2A and FIG. 3A, which will not be repeated here.

[0412] Step S3302, in a process of randomly accessing a second network device by the first network device, performing frequency domain compensation on a signal on a control link according to the first information.

[0413] Optional implementation of step S3302 can refer to optional implementation of step S2102 of FIG. 2A, steps S3102-S3104 of FIG. 3A, step S3202 and step S3203 of FIG. 3B, and other associated parts in the embodiments related to FIG. 2A, FIG. 3A, and FIG. 3B, which will not be repeated here.

[0414] At step S3303, after the first network device successfully accesses the second network device, frequency domain compensation is performed on the signal on the control link according to the first information.

[0415] The optional implementation of step S3303 can refer to step S2102 in FIG. 2A, steps S3102-S3104 in FIG. 3A, step S3202 in FIG. 3B, the optional implementation of step S3203, and other associated parts in the embodiments related to FIG. 2A, FIG. 3A and FIG. 3B, which will not be repeated here.

[0416] The communication method related to the embodiments of the present disclosure can include at least one of steps S3301-S3303. For example, step S3302 can be implemented as an independent embodiment, step S3303 can be implemented as an independent embodiment, and step S3302 and step S3303 can be implemented as independent embodiments, but are not limited thereto.

[0417] In some embodiments, the order between any two of steps S3301-S3303 can be exchanged or executed simultaneously.

[0418] In some embodiments, steps S3301 and S3303 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0419] In some embodiments, steps S3301 and S3302 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0420] In some embodiments, step S3301 is optional, and this step can be omitted or replaced in different embodiments.

[0421] FIG. 3D is a flow diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 3D, the embodiments of the present disclosure relate to a communication method performed by a first network device, and the above method includes:

[0422] At step S3401, a first message is received.

[0423] The optional implementation of step S3401 can refer to step S2101 in FIG. 2A, the optional implementation of step S3101 in FIG. 3A, and other associated parts in the embodiments related to FIG. 2A and FIG. 3A, which will not be repeated here.

[0424] At step S3402, frequency domain compensation is performed on the signal on the control link according to the first information.

[0425] The optional implementation of step S3402 can refer to the optional implementation of step S2102 in FIG. 2A, steps S3102 to S3104 in FIG. 3A, step S3202, step S3203 in FIG. 3B, the optional implementation of step S3302, step S3303 in FIG. 3C, and other associated parts in the embodiments related to FIG. 2A, FIG. 3A, FIG. 3B and FIG. 3C, which are not described herein.

[0426] The communication method related to the embodiments of the present disclosure can include at least one of step S3401 and step S3402. For example, step S3402 can be implemented as an independent embodiment, but is not limited thereto.

[0427] In some embodiments, step S3401 and step S3402 can be exchanged in order or executed simultaneously.

[0428] In some embodiments, step S3401 is optional, and can be omitted or replaced in different embodiments.

[0429] In some embodiments, step S3402 is optional, and can be omitted or replaced in different embodiments.

[0430] FIG. 3E is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 3E, the embodiments of the present disclosure relate to a communication method, which is executed by a first network device side, and the above method includes:

[0431] Step S3501, sending a second message.

[0432] The optional implementation of step S3501 can refer to the optional implementation of step S2201 in FIG. 2B and other associated parts in the embodiments related to FIG. 2B, which are not described herein.

[0433] In some embodiments, the first network device 101 sends the second message to the second network device 102, but is not limited thereto, and can send the second message to other subjects.

[0434] Optionally, the second message includes ephemeris information of the satellite.

[0435] Optionally, the second message includes ephemeris information of the satellite and frequency pre-compensation information of the uplink signal.

[0436] FIG. 3F is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 3F, the embodiments of the present disclosure relate to a communication method, which is executed by a first network device side, and the above method includes:

[0437] Step S3601, obtaining position information of a second network device on the ground.

[0438] The optional implementation of step S3601 can refer to the optional implementation of step S2301 in FIG. 2C and other associated parts in the embodiments related to FIG. 2C, which are not described here again.

[0439] In step S3602, the signal on the control link between the first network device and the second network device is frequency domain compensated according to the ephemeris information of the satellite and the position information of the second network device.

[0440] The optional implementation of step S3602 can refer to the optional implementation of steps S2302 and S2303 in FIG. 2C and other associated parts in the embodiments related to FIG. 2C, which are not described here again.

[0441] The communication method related to the embodiments of the present disclosure can include at least one of step S3601 and step S3602. For example, step S3602 can be implemented as an independent embodiment, but is not limited thereto.

[0442] In some embodiments, step S3601 and step S3602 can be exchanged in order or executed simultaneously.

[0443] In some embodiments, step S3601 is optional, and this step can be omitted or replaced in different embodiments.

[0444] In some embodiments, step S3602 is optional, and this step can be omitted or replaced in different embodiments.

[0445] FIG. 3G is a flow diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 3G, the embodiments of the present disclosure relate to a communication method, which is executed by the first network device side, and the above method includes:

[0446] In step S3701, the position information of the second network device on the ground and the frequency pre-compensation information of the second network device to the downlink signal of the control link are obtained.

[0447] The optional implementation of step S3701 can refer to the optional implementation of step S2401 in FIG. 2D and other associated parts in the embodiments related to FIG. 2D, which are not described here again.

[0448] In step S3702, the uplink signal of the control link is frequency domain compensated according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information of the downlink signal.

[0449] The optional implementation of step S3702 can refer to the optional implementation of steps S2402 and S2403 in FIG. 2D and other associated parts in the embodiments related to FIG. 2D, which are not described here again.

[0450] The communication method related to the embodiments of the present disclosure can include at least one of step S3701 and step S3702. For example, step S3702 can be implemented as an independent embodiment, but is not limited thereto.

[0451] In some embodiments, step S3701 and step S3702 can be exchanged in order or executed simultaneously.

[0452] In some embodiments, step S3701 is optional, and in different embodiments, this step can be omitted or replaced.

[0453] In some embodiments, step S3702 is optional, and in different embodiments, this step can be omitted or replaced.

[0454] FIG. 4A is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 4A, the embodiments of the present disclosure relate to a communication method, which is executed by the second network device side, and the above-mentioned method includes:

[0455] Step S4101, receiving a second message.

[0456] The optional implementation of step S4101 can refer to the optional implementation of step S2201 in FIG. 2B and other associated parts in the embodiments related to FIG. 2B, which will not be described here.

[0457] In some embodiments, the second network device 102 receives the second message sent by the first network device 101, but is not limited thereto, and can also receive the second message sent by other subjects.

[0458] In some embodiments, the second network device 102 obtains the second message specified by the protocol.

[0459] In some embodiments, the second network device 102 obtains the second message from the upper layer(s).

[0460] In some embodiments, the second network device 102 processes to obtain the second message.

[0461] In some embodiments, step S4101 is omitted, and the second network device 102 autonomously implements the function indicated by the second message, or the above-mentioned function is default or default.

[0462] Step S4102, determining first Doppler frequency offset information corresponding to the control link according to ephemeris information of the satellite and position information of the second network device.

[0463] The optional implementation of step S4102 can refer to the optional implementation of step S2202 in FIG. 2B and other associated parts in the embodiments related to FIG. 2B, which will not be repeated here.

[0464] In step S4103, the uplink signal of the control link is compensated in frequency domain according to the first Doppler frequency offset information.

[0465] The optional implementation of step S4103 can refer to the optional implementation of step S2202 in FIG. 2B and other associated parts in the embodiments related to FIG. 2B, which will not be repeated here.

[0466] In step S4104, the downlink signal of the control link is compensated in frequency domain according to the first Doppler frequency offset information.

[0467] The optional implementation of step S4104 can refer to the optional implementation of step S2202 in FIG. 2B and other associated parts in the embodiments related to FIG. 2B, which will not be repeated here.

[0468] The communication method related to the embodiments of the present disclosure can include at least one of steps S4101-S4104. For example, step S4102 can be implemented as an independent embodiment, step S4103 can be implemented as an independent embodiment, step S4104 can be implemented as an independent embodiment, step S4102 and step S4103 can be implemented as independent embodiments, step S4102 and step S4104 can be implemented as independent embodiments, but not limited to this.

[0469] In some embodiments, the order between any two of steps S4101-S4104 can be exchanged or executed simultaneously.

[0470] In some embodiments, steps S4101, S4103, S4104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0471] In some embodiments, steps S4101, S4102, S4104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0472] In some embodiments, steps S4101-S4103 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0473] In some embodiments, steps S4101 and S4104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0474] In some embodiments, steps S4101 and S4103 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0475] FIG. 4B is a flow diagram illustrating a communication method according to embodiments of the present disclosure. As shown in FIG. 4B, embodiments of the present disclosure relate to a communication method, which is performed by a second network device side, and the above method comprises the following steps:

[0476] In step S4201, a second message is received.

[0477] Optional implementation of step S4201 can refer to optional implementation of step S2201 in FIG. 2B, optional implementation of step S4101 in FIG. 4A, and other associated parts in embodiments related to FIG. 2B and FIG. 4A, which will not be described here.

[0478] In step S4202, third Doppler frequency offset information corresponding to the control link is determined according to ephemeris information of the satellite, position information of the second network device, and second frequency pre-compensation information.

[0479] Optional implementation of step S4202 can refer to optional implementation of step S2202 in FIG. 2B, and other associated parts in embodiments related to FIG. 2B, which will not be described here.

[0480] In step S4203, frequency domain compensation is performed on downlink signals of the control link according to the third Doppler frequency offset information.

[0481] Optional implementation of step S4203 can refer to optional implementation of step S2202 in FIG. 2B, and other associated parts in embodiments related to FIG. 2B, which will not be described here.

[0482] The communication method related to embodiments of the present disclosure can comprise at least one of steps S4201-S4203. For example, step S4202 can be implemented as an independent embodiment, step S4203 can be implemented as an independent embodiment, and steps S4202 and S4203 can be implemented as independent embodiments, but are not limited thereto.

[0483] In some embodiments, the order of any two of steps S4201-S4203 can be exchanged or performed simultaneously.

[0484] In some embodiments, steps S4201 and S4203 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0485] In some embodiments, step S4201 and step S4202 are optional, and one or more of the steps can be omitted or replaced in different embodiments.

[0486] In some embodiments, step S4201 is optional, and the step can be omitted or replaced in different embodiments.

[0487] In some embodiments, step S4203 can be combined with step S4103 of FIG. 4A.

[0488] FIG. 4C is a flow diagram of a communication method according to some embodiments of the present disclosure. As shown in FIG. 4C, some embodiments of the present disclosure relate to a communication method, which is performed by a second network device, and the method comprises the following steps:

[0489] In step S4301, a second message is received.

[0490] Optional implementation of step S4301 can refer to optional implementation of step S2201 of FIG. 2B, step S4101 of FIG. 4A, and other associated parts in the embodiments related to FIG. 2B and FIG. 4A, which will not be described here.

[0491] In step S4302, during random access of the first network device to the second network device, frequency domain compensation is performed on a signal on a control link according to the first information.

[0492] Optional implementation of step S4302 can refer to step S2202 of FIG. 2B, steps S4102-S4104 of FIG. 4A, step S4202 and step S4203 of FIG. 4B, and other associated parts in the embodiments related to FIG. 2B, FIG. 4A and FIG. 4B, which will not be described here.

[0493] In step S4303, after successful random access of the first network device to the second network device, frequency domain compensation is performed on a signal on a control link according to the first information.

[0494] Optional implementation of step S4303 can refer to step S2202 of FIG. 2B, steps S4102-S4104 of FIG. 4A, step S4202 and step S4203 of FIG. 4B, and other associated parts in the embodiments related to FIG. 2B, FIG. 4A and FIG. 4B, which will not be described here.

[0495] The communication method according to some embodiments of the present disclosure can comprise at least one of steps S4301-S4303. For example, step S4302 can be implemented as an independent embodiment, step S4303 can be implemented as an independent embodiment, and step S4302 and step S4303 can be implemented as independent embodiments, but are not limited thereto.

[0496] In some embodiments, the order between any two of steps S4301-S4303 can be exchanged or performed simultaneously.

[0497] In some embodiments, steps S4301 and S4303 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0498] In some embodiments, steps S4301 and S4302 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0499] In some embodiments, step S4301 is optional, and this step can be omitted or replaced in different embodiments.

[0500] FIG. 4D is a flow diagram illustrating a communication method according to embodiments of the present disclosure. As shown in FIG. 4D, embodiments of the present disclosure relate to a communication method, which is performed by a second network device side, and the above method comprises the following steps:

[0501] In step S4401, a second message is received.

[0502] Optional implementation of step S4401 can refer to optional implementation of step S2201 in FIG. 2B, step S4101 in FIG. 4A, and other associated parts in embodiments related to FIG. 2B and FIG. 4A, which will not be described here.

[0503] In step S4402, a signal on a control link is frequency domain compensated according to first information.

[0504] Optional implementation of step S4402 can refer to step S2202 in FIG. 2B, steps S4102-S4104 in FIG. 4A, step S4202 and step S4203 in FIG. 4B, optional implementation of step S4302 and step S4303 in FIG. 4C, and other associated parts in embodiments related to FIG. 2B, FIG. 4A, FIG. 4B, and FIG. 4C, which will not be described here.

[0505] The communication method related to embodiments of the present disclosure can comprise at least one of step S4401 and step S4402. For example, step S4402 can be implemented as an independent embodiment, but is not limited thereto.

[0506] In some embodiments, the order between step S4401 and step S4402 can be exchanged or performed simultaneously.

[0507] In some embodiments, step S4401 is optional, and this step can be omitted or replaced in different embodiments.

[0508] In some embodiments, step S4402 is optional, and in different embodiments, the step can be omitted or replaced.

[0509] FIG. 4E is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 4E, the embodiments of the present disclosure relate to a communication method, which is performed by the second network device side, and the above method comprises the following steps:

[0510] In step S4501, a first message is sent.

[0511] The optional implementation of step S4501 can refer to the optional implementation of step S2101 in FIG. 2A and other associated parts in the embodiments related to FIG. 2A, which will not be described here.

[0512] In some embodiments, the second network device 102 sends the first message to the first network device 101, but is not limited thereto, and can send the first message to other subjects.

[0513] Optionally, the first message comprises the location information of the second network device.

[0514] Optionally, the first message comprises the location information of the second network device and the frequency pre-compensation information of the downlink signal.

[0515] FIG. 4F is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 4F, the embodiments of the present disclosure relate to a communication method, which is performed by the second network device side, and the above method comprises the following steps:

[0516] In step S4601, ephemeris information of a satellite is acquired.

[0517] The optional implementation of step S4601 can refer to the optional implementation of step S2501 in FIG. 2E and other associated parts in the embodiments related to FIG. 2E, which will not be described here.

[0518] In step S4602, frequency domain compensation is performed on the signal on the control link between the second network device and the first network device on the satellite according to the ephemeris information of the satellite and the location information of the second network device.

[0519] The optional implementation of step S4602 can refer to the optional implementation of steps S2502 and S2503 in FIG. 2E and other associated parts in the embodiments related to FIG. 2E, which will not be described here.

[0520] The communication method related to the embodiments of the present disclosure can comprise at least one of step S4601 and step S4602. For example, step S4602 can be implemented as an independent embodiment, but is not limited thereto.

[0521] In some embodiments, step S4601 and step S4602 can be exchanged in order or executed simultaneously.

[0522] In some embodiments, step S4601 is optional, which can be omitted or replaced in different embodiments.

[0523] In some embodiments, step S4602 is optional, which can be omitted or replaced in different embodiments.

[0524] FIG. 4G is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 4F, the embodiments of the present disclosure relate to a communication method, which is executed by the second network device side, and the above method comprises:

[0525] In step S4701, ephemeris information of the satellite and frequency pre-compensation information of the uplink signal of the control link by the first network device on the satellite are acquired.

[0526] The optional implementation of step S4701 can refer to the optional implementation of step S2601 in FIG. 2F and other associated parts in the embodiments related to FIG. 2F, which will not be repeated here.

[0527] In step S4702, the downlink signal on the control link is compensated in the frequency domain according to the ephemeris information of the satellite, the location information of the second network device, and the frequency pre-compensation information of the uplink signal.

[0528] The optional implementation of step S4702 can refer to the optional implementation of steps S2602 and S2603 in FIG. 2F and other associated parts in the embodiments related to FIG. 2E, which will not be repeated here.

[0529] The communication method related to the embodiments of the present disclosure can comprise at least one of step S4701 and step S4702. For example, step S4602 can be implemented as an independent embodiment, but is not limited thereto.

[0530] In some embodiments, step S4701 and step S4702 can be exchanged in order or executed simultaneously.

[0531] In some embodiments, step S4701 is optional, which can be omitted or replaced in different embodiments.

[0532] In some embodiments, step S4702 is optional, which can be omitted or replaced in different embodiments.

[0533] FIG. 5 is a flow diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in FIG. 5, the embodiment of the present disclosure relates to a communication method, which is performed by a communication device, which can be a first network device or a second network device, and the method comprises the following steps:

[0534] In step S501, frequency domain compensation is performed on the signal on the control link according to the first information.

[0535] The optional implementation of step S501 can refer to the optional implementation of step S2102 in FIG. 2A, step S2202 in FIG. 2B, steps S3102-S3104 in FIG. 3A, step S3202, step S3203 in FIG. 3B, step S3302, step S3303 in FIG. 3C, step S3402 in FIG. 3D, steps S4102-S4104 in FIG. 4A, step S4202, step S4203 in FIG. 4B, step S4302, step S4303 in FIG. 4C, the optional implementation of step S4402 in FIG. 4D, and other related parts in the embodiments related to FIG. 2A, FIG. 2B, FIG. 3A, FIG. 3B, FIG. 3C, FIG. 3D, FIG. 4A, FIG. 4B, FIG. 4C, FIG. 4D, which are not repeated here.

[0536] In some embodiments, it is assumed that the NCR is located on the satellite to implement the function of signal forwarding to the ground, the NCR establishes a backhaul link and a control link with the ground base station, and the NCR establishes an access link with the ground UE. For the UE and the base station located on the ground, signal forwarding on the access link and the backhaul link can be implemented via the NCR located on the satellite, and the process is the same as that of the UE under the transparent NTN architecture. The embodiments described below mainly explain the frequency domain problem on the control link between the NCR-MT located on the satellite and the ground base station.

[0537] The embodiment 1 of the present disclosure provides that the NCR compensates for the frequency offset from the satellite to the ground base station / ground station / reference point.

[0538] In some embodiments, the NCR compensates based on the first information, and the first information comprises one of the following:

[0539] Ephemeris information of the satellite;

[0540] Position information of the ground base station / ground station;

[0541] Position information of the reference point.

[0542] It should be explained that the reference point can be an uplink time synchronization reference point. The uplink time synchronization reference point can be a certain position point on the ground. The position information of the reference point can be a latitude and longitude position information, GNSS position information, etc.

[0543] In some embodiments, the position information of the reference point can be used instead of the position information of the ground base station / ground station, so as to protect the privacy of the ground base station / ground station.

[0544] It should be noted that the ephemeris information of the satellite can be considered as known by the NCR, and the position information of the ground base station / ground station / reference point can be obtained by the base station indication or by the OAM.

[0545] In some embodiments, the base station configures the position information of the ground base station / ground station / reference point to the NCR through an RRC message.

[0546] Preferably, the base station configures the RRC information after the NCR accesses the network and passes the authentication.

[0547] Preferably, the base station updates the position information of the ground base station / ground station / reference point through the MAC CE or the RRC.

[0548] In an embodiment, the base station broadcasts the position information of the ground base station / ground station / reference point through broadcasting.

[0549] Preferably, the base station updates the position information of the ground base station / ground station / reference point through the MAC CE or the RRC.

[0550] In an embodiment, the NCR obtains the position of the ground base station / ground station / reference point through the OAM message.

[0551] Preferably, the OAM message is sent by the base station to the NCR after the NCR accesses the network.

[0552] The present disclosure provides an embodiment 2, wherein the satellite-to-ground base station / ground station / reference point frequency offset is compensated by the ground base station / ground station.

[0553] Optionally, the base station compensates based on the first information, and the first information at least includes one of:

[0554] The ephemeris information of the satellite;

[0555] The position information of the ground base station / ground station;

[0556] The position of the reference point.

[0557] Wherein, the position of the reference point is used instead of the position information of the ground base station / ground station, so as to protect the privacy of the ground base station / ground station.

[0558] In some embodiments, the position information of the ground base station / ground station / reference point is considered known by the base station. The satellite ephemeris information can be informed to the base station by OAM or obtained by the NCR reporting.

[0559] In one embodiment, the satellite ephemeris information is informed to the base station by OAM message.

[0560] In one embodiment, the satellite ephemeris information is reported to the base station by the NCR, which can be included in the NCR-MT capability reporting.

[0561] Preferably, the NCR reports after accessing the network.

[0562] The present disclosure provides embodiment 3, i.e., a combination of embodiment 1 and embodiment 2.

[0563] For example, the methods of embodiment 1 and embodiment 2 can be used in different communication processes. For example, the method of embodiment 1 is used when not connected to the network, and the method of embodiment 2 is used after accessing the network. For example, the method of embodiment 2 is used when not connected to the network, and the method of embodiment 1 is used after accessing the network, and so on.

[0564] For example, the methods of embodiment 1 and embodiment 2 can be used in different transmission links (uplink and downlink).

[0565] The following detailed examples are described below. In the following examples, the uplink refers to the NCR on the satellite to the ground base station, and the downlink refers to the ground base station to the NCR on the satellite.

[0566] Example 1: only the method of embodiment 1 is used. Specifically, the base station sends SSB information, and the broadcast information contains the position information of the ground base station / ground station / reference point (hereinafter referred to as the position of the reference point). The NCR-MT located on the satellite captures the SSB after multiple attempts and successfully decodes the position information of the reference point. The uplink transmission such as the physical random access channel (Prach) and the physical uplink shared channel (pusch) is compensated in the frequency domain according to the satellite position and the ground position, and the downlink signal such as msg2 is compensated in the frequency domain. That is, the frequency domain compensation of the uplink and the downlink is borne by the NCR-MT.

[0567] In short, the NCR-MT calculates the frequency domain Doppler shift on the control link based on the satellite ephemeris information and the reference point location information, which is used for both uplink and downlink transmission on the control link.

[0568] Example 2: only using the way of example 2. Specifically, the base station knows the satellite ephemeris information based on OAM information, the base station does the frequency compensation for the downlink signal based on the satellite ephemeris and its own location, the NCR-MT on the satellite sends the random access preamble without frequency domain compensation, and the base station does the post-compensation for the frequency domain after receiving the preamble. That is, the frequency compensation for both uplink and downlink is done by the base station.

[0569] In short, the ground base station calculates the frequency domain Doppler shift on the control link based on the satellite ephemeris information and the location information of the ground base station, which is used for both uplink and downlink transmission on the control link.

[0570] In this way, since in the traditional NTN transparent forwarding, the ground base station compensates the frequency offset on the feeder link (satellite to ground base station), if the NCR is launched into space, the frequency compensation on the backhaul link in the forwarding link will also be done by the base station, and therefore the frequency offset on the control can also be done by the base station.

[0571] Example 3, mixed use of the way of example 1 and example 2. Specifically, the base station does the frequency pre-compensation for the downlink signal based on the assumed satellite location to reduce the complexity of the NCR-MT capturing the SSB, while the SSB contains the location information of the reference point, and the NCR-MT does the time and frequency compensation based on the information. At this time, the time and frequency compensation of the uplink and the frequency domain compensation of the remaining part of the downlink are all borne by the NCR-MT.

[0572] Optionally, the base station can inform the NCR-MT of the frequency pre-compensation value of the downlink signal to help the NCR-MT do the frequency compensation of the uplink and downlink signal.

[0573] In short, the NCR-MT calculates the frequency domain Doppler shift on the control link based on the satellite ephemeris information and the reference point location information, which is used for both uplink and downlink transmission on the control link.

[0574] Example 4, mixed use of the way of embodiment 1 and embodiment 2. Specifically, the base station sends SSB without knowing the satellite ephemeris information, while the SSB contains the position information of the reference point, after the NCR-MT captures the SSB, the NCR-MT acquires the position information of the reference point, and the NCR-MT performs frequency compensation based on the information in the cell random access process, at this time, the frequency domain compensation of uplink and downlink is borne by the NCR-MT. After the NCR accesses the cell, the satellite ephemeris information is reported to the cell, at this time, the frequency domain compensation of uplink and downlink is done by the base station.

[0575] Briefly, in the random access process, the NCR-MT calculates the frequency domain Doppler shift on the control link based on the satellite ephemeris information and the reference point position information for uplink and downlink transmission. After accessing the cell, the base station calculates the frequency domain Doppler shift on the control link based on the satellite ephemeris information and the reference point position information for uplink and downlink transmission.

[0576] Example 5, mixed use of the way of embodiment 1 and embodiment 2. Specifically, the base station knows the satellite ephemeris information based on the OAM information, the base station compensates the downlink signal based on the satellite ephemeris and its own position, the base station broadcasts the position information of the reference point, the NCR-MT on the satellite retrieves the SSB and successfully decodes the position information of the reference point, and performs time-frequency compensation on the uplink according to the satellite position and the ground position. That is, the frequency domain compensation of uplink is borne by the NCR-MT, and the frequency domain compensation of downlink is borne by the base station.

[0577] Optionally, the base station can also inform the UE of the frequency pre-compensation value of the downlink signal to help the UE perform frequency compensation of the uplink signal.

[0578] Briefly, the NCR-MT calculates the frequency domain Doppler shift on the control link based on the satellite ephemeris information and the reference point position information for uplink transmission. The base station calculates the frequency domain Doppler shift on the control link based on the satellite ephemeris information and the reference point position information for downlink transmission.

[0579] In the embodiments of the present disclosure, part or all of the steps, and optional implementation manners thereof, can be combined with part or all of the steps in other embodiments, or can be combined with optional implementation manners of other embodiments.

[0580] The embodiments of the present disclosure further provide a device for implementing any of the above methods, for example, a device comprising units or modules for implementing the steps performed by the first network device in any of the above methods. For another example, another device is further provided, comprising units or modules for implementing the steps performed by the second network device (such as an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0581] It should be understood that the division of each unit or module in the above device is only a logical function division, and all or part of the units or modules can be integrated into one physical entity or physically separated in actual implementation. In addition, the units or modules in the device can be implemented in the form of processor invoking software: for example, the device comprises a processor connected with a memory, the memory stores instructions, and the processor invokes the instructions stored in the memory to implement any of the above methods or to implement the functions of each unit or module of the device, wherein the processor is a general processor such as a central processing unit (CPU) or a microprocessor, and the memory is a memory in the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuit, and the functions of part or all of the units or modules can be implemented by the design of the hardware circuit, and the hardware circuit can be understood as one or more processors; for example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC), and the functions of part or all of the units or modules are implemented by the design of the logical relationship between the elements in the circuit; for another example, in another implementation, the hardware circuit is a programmable logic device (PLD), and taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by a configuration file, so as to implement the functions of part or all of the units or modules. All units or modules of the above device can be implemented in the form of processor invoking software, or all units or modules can be implemented in the form of hardware circuit, or part of the units or modules are implemented in the form of processor invoking software, and the remaining part is implemented in the form of hardware circuit.

[0582] In the embodiments of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor can be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), a digital signal processor (DSP), or the like. In another implementation, the processor can implement certain functions through a logical relationship of a hardware circuit, and the logical relationship of the hardware circuit is fixed or can be reconfigured. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In the reconfigurable hardware circuit, the processor loads a configuration document to implement the configuration of the hardware circuit. It can be understood that the processor loads instructions to implement the functions of the above part or all units or modules. In addition, the hardware circuit can also be designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), and the like.

[0583] FIG. 6 is a structural schematic diagram of a first network device according to an embodiment of the present disclosure. As shown in FIG. 6, the first network device 600 can include at least one of a transceiver module 601, a processing module 602, and the like. In some embodiments, the processing module is configured to obtain position information of a second network device on the ground, and perform frequency domain compensation on a signal on a control link between the first network device and the second network device according to ephemeris information of a satellite and the position information of the second network device. Alternatively, the processing module is configured to obtain position information of a second network device on the ground and frequency pre-compensation information of a downlink signal of the control link by the second network device, wherein one end of the control link is the first network device, the other end of the control link is the second network device, and the downlink signal is a signal sent by the second network device to the first network device; and perform frequency domain compensation on an uplink signal of the control link according to ephemeris information of a satellite, the position information of the second network device, and the frequency pre-compensation information, wherein the uplink signal is a signal sent by the first network device to the second network device.

[0584] Optionally, the transceiver module is configured to perform at least one of the communication steps (e.g., steps S2101, S2201, S2301, S2401, S2501, S2601, but not limited to) of transmitting and / or receiving performed by the first network device 101 in any of the above methods, which will not be described herein again. Optionally, the processing module is configured to perform at least one of the other steps (e.g., steps S2102, S2202, S2302, S2303, S2402, S2403, S2502, S2503, S2602, S2603, but not limited to) performed by the first network device 101 in any of the above methods, which will not be described herein again.

[0585] FIG. 7 is a structural schematic diagram of a second network device according to an embodiment of the present disclosure. As shown in FIG. 7, the second network device 700 can include at least one of a transceiver module 701, a processing module 702, etc. In some embodiments, the processing module is configured to obtain ephemeris information of a satellite; and perform frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device. Alternatively, the processing module is configured to obtain ephemeris information of a satellite, and frequency pre-compensation information of an uplink signal of a control link by a first network device on the satellite, wherein one end of the control link is the first network device, the other end of the control link is the second network device, and the uplink signal is a signal sent by the first network device to the second network device; and perform frequency domain compensation on a downlink signal on the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information.

[0586] Optionally, the transceiver module is configured to perform at least one of the communication steps (e.g., steps S2101, S2201, S2301, S2401, S2501, S2601, but not limited to) of transmitting and / or receiving performed by the second network device 102 in any of the above methods, which will not be described herein again. Optionally, the processing module is configured to perform at least one of the other steps (e.g., steps S2102, S2202, S2302, S2303, S2402, S2403, S2502, S2503, S2602, S2603, but not limited to) performed by the second network device 101 in any of the above methods, which will not be described herein again.

[0587] In some embodiments, the transceiving module can include a transmitting module and / or a receiving module, which can be separate or integrated together. Alternatively, the transceiving module can be mutually replaced with a transceiver.

[0588] In some embodiments, the processing module can be one module or include multiple sub-modules. Alternatively, the multiple sub-modules perform all or part of the steps required to be performed by the processing module respectively. Alternatively, the processing module can be mutually replaced with a processor.

[0589] FIG. 8A is a structural schematic diagram of a communication device 8100 according to embodiments of the present disclosure. The communication device 8100 can be a network device (for example, an access network device, a core network device, etc.), can be a first network device (for example, an NCR-MT, etc.), can be a second network device (for example, a ground base station, etc.), can be a chip, a chip system, or a processor supporting the first network device and / or the second network device to implement any of the above methods, etc., and can be a chip, a chip system, or a processor supporting the first network device and / or the second network device to implement any of the above methods, etc. The communication device 8100 can be used to implement the methods described in the above method embodiments, and specific reference can be made to the descriptions in the above method embodiments.

[0590] As shown in FIG. 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a special-purpose processor, etc., for example, can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (for example, a base station, a baseband chip, a network device, a network device chip, a DU or a CU, etc.), execute programs, and process data of the programs. Alternatively, the communication device 8100 is used to execute any of the above methods. Alternatively, the one or more processors 8101 are used to call instructions to enable the communication device 8100 to execute any of the above methods.

[0591] In some embodiments, the communication device 8100 further includes one or more transceiver(s) 8102. When the communication device 8100 includes one or more transceiver(s) 8102, the transceiver(s) 8102 perform at least one of the communication steps (e.g., steps S2101, S2201, S2301, S2401, S2501, S260, but not limited to) of transmitting and / or receiving in the above-described methods, and the processor 8101 performs at least one of the other steps (e.g., steps S2102, S2202, S2302, S2303, S2402, S2403, S2502, S2503, S2602, S2603, but not limited to). In alternative embodiments, the transceiver(s) can include a receiver and / or a transmitter, which can be separate or integrated together. Alternatively, the terms transceiver, transceiving unit, transceiver, transceiving circuit, interface circuit, interface, etc. can be replaced by each other, the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc. can be replaced by each other, and the terms receiver, receiving unit, receiver, receiving circuit, etc. can be replaced by each other.

[0592] In some embodiments, the communication device 8100 further includes one or more memory(ies) 8103 for storing data. Alternatively, all or part of the memory(ies) 8103 can also be outside the communication device 8100. In alternative embodiments, the communication device 8100 can include one or more interface circuits 8104. Alternatively, the interface circuit 8104 is connected with the memory 8103, and the interface circuit 8104 can be used to receive data from the memory 8103 or other devices, and can be used to send data to the memory 8103 or other devices. For example, the interface circuit 8104 can read the data stored in the memory 8103 and send the data to the processor 8101.

[0593] The communication device 8100 described in the above embodiments can be a second network device or a first network device (e.g., NCR-MT, etc.), but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 can not be limited by Figure 8A. The communication device can be a standalone device or can be part of a larger device. For example, the communication device can be: (1) a standalone integrated circuit (IC), or a chip, or a chip system or subsystem; (2) a set of one or more ICs, which can optionally include a storage component for storing data, programs; (3) an ASIC, such as a Modem; (4) a module that can be embedded in other devices; (5) a receiver, a network device, a smart network device, a cellular phone, a wireless device, a handset, a mobile unit, a car-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0594] FIG. 8B is a structural schematic diagram of a chip 8200 according to an embodiment of the present disclosure. For the case where the communication device 8100 can be a chip or a chip system, reference can be made to the structural schematic diagram of the chip 8200 shown in FIG. 8B, but the present disclosure is not limited thereto.

[0595] The chip 8200 comprises one or more processors 8201. The chip 8200 is configured to execute any of the above methods.

[0596] In some embodiments, the chip 8200 further comprises one or more interface circuits 8202. Optionally, the terms interface circuit, interface, transceiver pin, etc. can be replaced by each other. In some embodiments, the chip 8200 further comprises one or more memories 8203 for storing data. Optionally, all or part of the memory 8203 can be outside the chip 8200. Optionally, the interface circuit 8202 is connected with the memory 8203, the interface circuit 8202 can be configured to receive data from the memory 8203 or other devices, and the interface circuit 8202 can be configured to send data to the memory 8203 or other devices. For example, the interface circuit 8202 can read the data stored in the memory 8203 and send the data to the processor 8201.

[0597] In some embodiments, the interface circuit 8202 performs at least one of the communication steps (such as step S2101, step S2201, step S2301, step S2401, step S2501, step S2601, but the present disclosure is not limited thereto) of transmitting and / or receiving in the above methods. The interface circuit 8202 performing the communication steps such as transmitting and / or receiving in the above methods means that the interface circuit 8202 performs data interaction between the processor 8201, the chip 8200, the memory 8203 or the transceiver device. In some embodiments, the processor 8201 performs at least one of the other steps (such as step S2102, step S2202, step S2302, step S2303, step S2402, step S2403, step S2502, step S2503, step S2602, step S2603, but the present disclosure is not limited thereto).

[0598] The modules and / or devices described in each of the embodiments of the virtual device, the physical device, the chip, etc. can be combined or separated as appropriate. Optionally, part or all of the steps can also be performed by a plurality of modules and / or devices in cooperation, which is not limited herein.

[0599] The disclosure further provides a storage medium having stored instructions which, when executed on the communication device 8100, cause the communication device 8100 to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited to this, and can also be a storage medium readable by other devices. Optionally, the storage medium can be a non-transitory storage medium, but is not limited to this, and can also be a transitory storage medium.

[0600] The disclosure further provides a program product which, when executed by the communication device 8100, causes the communication device 8100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0601] The disclosure further provides a computer program which, when executed on a computer, causes the computer to perform any of the above methods.

Claims

1. A communication method characterized by comprising: The method is performed by a first network device on a satellite, and the method comprises: obtaining position information of a second network device on the ground; performing frequency domain compensation on signals on a control link between the first network device and the second network device according to ephemeris information of the satellite and the position information of the second network device.

2. The method of claim 1, wherein, The first network device has the ability to receive control commands sent by the second network device and control the behavior of a transponder on the satellite according to the control commands.

3. The method according to claim 1 or 2, characterized in that, The position information of the second network device is obtained from at least one of the following messages sent by the second network device: a radio resource control (RRC) message; a medium access control (MAC) control element (CE); a broadcast message; an operation, administration and maintenance (OAM) message.

4. The method according to any one of claims 1-3, characterized in that, The frequency domain compensation on the signals on the control link according to the ephemeris information of the satellite and the position information of the second network device comprises: determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device; in a process of random access of the first network device to the second network device and / or after the random access of the first network device to the second network device is successful, performing frequency domain compensation on uplink signals and / or downlink signals of the control link according to the first Doppler frequency offset information, the uplink signals being signals sent by the first network device to the second network device, and the downlink signals being signals sent by the second network device to the first network device.

5. A communication method characterized by comprising: The method is performed by a first network device on a satellite, and the method comprises: obtaining position information of a second network device on the ground and frequency pre-compensation information of the second network device on downlink signals of a control link, wherein one end of the control link is the first network device, the other end of the control link is the second network device, and the downlink signals are signals sent by the second network device to the first network device; performing frequency domain compensation on uplink signals of the control link according to ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information, the uplink signals being signals sent by the first network device to the second network device.

6. The method of claim 5, wherein, The first network device has the ability to receive control commands sent by the second network device and control the behavior of a transponder on the satellite according to the control commands.

7. The method of claim 6, wherein, The frequency pre-compensation information and / or the position information of the second network device is obtained from at least one of the following messages sent by the second network device: a radio resource control (RRC) message; a medium access control (MAC) control element (CE); a broadcast message; an operation, administration and maintenance (OAM) message.

8. The method according to any one of claims 5-7, characterized in that, The frequency domain compensation on the uplink signals of the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information comprises: determining second Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information. In a process that the first network device randomly accesses the second network device and / or after the first network device successfully randomly accesses the second network device, frequency domain compensation is performed on the uplink signal according to the second Doppler frequency offset information. The method is performed by a second network device on the ground, and the method comprises:

9. A communication method characterized by comprising: obtaining ephemeris information of a satellite; performing frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device. The ephemeris information of the satellite is obtained from at least one of the following messages:

10. The method of claim 9, wherein, a capability reporting message sent by the first network device; an OAM message sent by an operation, maintenance and management device. The performing of the frequency domain compensation on the signal on the control link according to the ephemeris information of the satellite and the position information of the second network device comprises:

11. The method according to claim 9 or 10, characterized in that, determining first Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite and the position information of the second network device; in a process that the first network device randomly accesses the second network device and / or after the first network device successfully randomly accesses the second network device, performing frequency domain compensation on an uplink signal and / or a downlink signal of the control link according to the first Doppler frequency offset information, the uplink signal being a signal sent by the first network device to the second network device, and the downlink signal being a signal sent by the second network device to the first network device. The method is performed by a second network device on the ground, and the method comprises:

12. A communication method characterized by comprising: obtaining ephemeris information of a satellite and frequency pre-compensation information of an uplink signal of a control link by a first network device on the satellite, wherein one end of the control link is the first network device, the other end of the control link is the second network device, and the uplink signal is a signal sent by the first network device to the second network device; performing frequency domain compensation on a downlink signal on the control link according to the ephemeris information of the satellite, position information of the second network device and the frequency pre-compensation information. The frequency pre-compensation information and / or the ephemeris information of the satellite is obtained from at least one of the following messages:

13. The method of claim 12, wherein, a capability reporting message sent by the first network device; an OAM message sent by an operation, maintenance and management device. The performing of the frequency domain compensation on the downlink signal on the control link according to the ephemeris information of the satellite, the position information of the second network device and the frequency pre-compensation information comprises:

14. The method according to claim 12 or 13, characterized in that, determining third Doppler frequency offset information corresponding to the control link according to the ephemeris information of the satellite, the position information of the second network device and the frequency pre-compensation information; in a process that the first network device randomly accesses the second network device and / or after the first network device successfully randomly accesses the second network device, performing frequency domain compensation on the downlink signal according to the third Doppler frequency offset information. comprise:

15. A first network device, comprising: a processing module configured to obtain position information of a second network device on the ground; ​ The signal on the control link between the first network device and the second network device is frequency domain compensated according to ephemeris information of a satellite where the first network device is located and position information of the second network device.

16. A first network device, comprising: Comprising: The processing module is configured to acquire position information of a second network device on the ground and frequency pre-compensation information of the second network device on a downlink signal of a control link, wherein one end of the control link is the first network device on a satellite, the other end of the control link is the second network device, and the downlink signal is a signal sent by the second network device to the first network device; and the processing module is further configured to perform frequency domain compensation on an uplink signal of the control link according to ephemeris information of the satellite, the position information of the second network device, and the frequency pre-compensation information, wherein the uplink signal is a signal sent by the first network device to the second network device. Comprising:

17. A second network device, comprising: The processing module is configured to acquire ephemeris information of a satellite; and perform frequency domain compensation on a signal on a control link between the second network device and a first network device on the satellite according to the ephemeris information of the satellite and position information of the second network device on the ground. Comprising:

18. A second network device, comprising: The processing module is configured to acquire ephemeris information of a satellite and frequency pre-compensation information of a first network device on the satellite on an uplink signal of a control link, wherein one end of the control link is the first network device, the other end of the control link is the second network device on the ground, and the uplink signal is a signal sent by the first network device to the second network device; and the processing module is further configured to perform frequency domain compensation on a downlink signal of the control link according to the ephemeris information of the satellite, position information of the second network device, and the frequency pre-compensation information. Comprising:

19. A communication device, characterized by One or more processors; A memory coupled to the processors, the memory having stored thereon executable instructions that, when executed by the processors, cause the communication method of any of claims 1-14 to be performed. The instructions, when executed on a communication device, cause the communication device to perform the communication method of any of claims 1-14.

20. A storage medium, the storage medium storing instructions, wherein, The computer program and / or instructions, when executed on a communication device, implement the communication method of any of claims 1-14.

21. A computer program product comprising computer programs and / or instructions, characterized in that, Comprising:

22. A communication system, characterized by A first network device configured to perform the method of any of claims 1-8; A second network device configured to perform the method of any of claims 9-14. ​

Images