WO2025086072A1 - Parameter determination method and related device - Google Patents

Abstract

The present application provides a parameter determination method and a related device, which are beneficial to acquiring an accurate TA by a satellite to perform uplink data transmission. The method comprises: a satellite accesses a base station on the basis of a first TA of the satellite; the base station verifies the satellite that accesses the base station; when the verification of the satellite succeeds, the base station sends first configuration information to the satellite, the first configuration information being used for indicating the position of the base station, or the first configuration information being used for indicating a TA change rule of the satellite; and the satellite determines a second TA of the satellite on the basis of the first configuration information, the second TA being used for the satellite to perform uplink data transmission.

Description

Parameter determination method and related device Technical Field

The present application relates to the field of communications, and in particular to a parameter determination method and related devices.

Background Art

Non-terrestrial networks (NTN) communication has the characteristics of large coverage area and flexible networking, and can achieve seamless global network coverage. NTN network is not only a supplement to the current terrestrial network, but also an independent communication system that provides users with global high-speed network access. NTN communication includes the use of drones, high-altitude platforms, satellites and other equipment for networking, providing data transmission, voice communication and other services for user equipment (UE).

Integrated access and backhaul (IAB) is a type of network technology that supports wireless backhaul and relay links, which can achieve flexible and dense deployment of NR cells. In the NTN network (NTN-IAB) scenario using IAB technology, satellites can access base stations as UEs for communication. However, satellites cannot obtain accurate timing advance (TA) for uplink data transmission.

Summary of the invention

The present application provides a parameter determination method and related devices, which are helpful for the satellite to obtain accurate TA for uplink data transmission.

In a first aspect, a parameter determination method is provided, which can be executed by a satellite, or by a component of a satellite (such as a processor, a chip, or a chip system, etc.), or by a logic module or software that can implement all or part of the satellite functions. The method includes: accessing a base station based on a first TA of a satellite; receiving first configuration information from a base station, the first configuration information is received after the base station verifies the accessed satellite, the first configuration information is used to indicate the location of the base station, or the first configuration information is used to indicate the TA change rule of the satellite; and, based on the first configuration information, determining a second TA of the satellite, the second TA is used for uplink data transmission by the satellite.

The location of the base station refers to the exact location of the base station, and the location of the satellite refers to the exact location of the satellite. In this application, the satellite accesses the base station as a UE. For network management considerations, the network side does not want ordinary UEs to obtain the exact location of the base station. Therefore, the base station needs to verify the identity of the accessed satellite. After the verification of the base station is passed, the satellite can receive the first configuration information from the base station, which is conducive to meeting the network management requirements for the location of the base station.

When the first configuration information indicates the location of the base station, since the indicated location of the base station is accurate, the satellite can determine the accurate round-trip delay between the satellite and the base station based on the location of the base station and the location of the satellite, and then determine the accurate second TA of the satellite based on the accurate round-trip delay between the satellite and the base station, which is conducive to the satellite obtaining an accurate TA for uplink data transmission.

When the first configuration information indicates the TA variation pattern of the satellite, since the base station can determine the satellite's motion trajectory based on the satellite's ephemeris information and since the position of the base station is known to the base station, the base station can obtain the accurate TA variation pattern of the satellite and send it to the satellite. Therefore, the satellite can obtain the accurate round-trip delay between the satellite and the base station based on the TA variation pattern of the satellite, and then determine the accurate second TA of the satellite based on the accurate round-trip delay between the satellite and the base station, which is conducive to the satellite obtaining accurate TA for uplink data transmission.

In combination with the first aspect, in some implementations of the first aspect, the first configuration information is used to indicate a location of the base station. Determining a second TA of the satellite based on the first configuration information includes: determining the second TA of the satellite based on the location of the base station and the location of the satellite.

In combination with the first aspect, in some implementations of the first aspect, the first configuration information is used to indicate a TA change rule of the satellite. Determining a second TA of the satellite based on the first configuration information includes: determining the second TA of the satellite based on the TA change rule of the satellite.

In combination with the first aspect, in some implementations of the first aspect, before the satellite-based first TA accesses the base station, the method further includes:

Receive second configuration information from the base station; and determine a first TA of the satellite based on the second configuration information.

In the present application, the second configuration information is used to indicate the ambiguous position of the base station, or the second configuration information is used to indicate the changing rule of the public TA, or the second configuration information is used to indicate the ambiguous position of the base station and the round-trip delay between the ambiguous position of the base station and the position of the base station.

Since the satellite does not obtain the accurate location of the base station before accessing the base station, the satellite can determine the first TA to access based on the second configuration information. Since the accuracy of the first configuration information is higher than the accuracy of the second configuration information, the accuracy of the second TA is higher than the accuracy of the first TA.

In combination with the first aspect, in some implementations of the first aspect, the second configuration information is used to indicate an ambiguous position of a base station, and the ambiguous position of the base station is determined based on the position of the base station and a preset TA accuracy range; determining a first TA of the satellite based on the second configuration information includes: determining the first TA of the satellite based on the ambiguous position of the base station and the position of the satellite. This helps the satellite determine a TA that can be used to access the base station and achieve uplink data transmission.

In combination with the first aspect, in certain implementations of the first aspect, the first configuration information is used to indicate the location of the base station, including: the first configuration information includes the coordinates of the location of the base station; or, the first configuration information includes the difference between the coordinates of the ambiguous location of the base station and the coordinates of the location of the base station.

In the present application, when the first configuration information includes the coordinates of the location of the base station, it is helpful to reduce the calculation complexity of the satellite. When the first configuration information includes the difference between the coordinates of the fuzzy location of the base station and the coordinates of the location of the base station, it is helpful to further meet the network management requirements for the location of the base station.

In combination with the first aspect, in some implementations of the first aspect, the second configuration information is used to indicate a change rule of a common TA. Determining a first TA of the satellite based on the second configuration information includes: determining the first TA of the satellite based on a change rule of the common TA. This helps the satellite determine a TA that can be used to access a base station and implement uplink data transmission.

In combination with the first aspect, in some implementations of the first aspect, the second configuration information is further used to indicate a round-trip delay between the ambiguous position of the base station and the position of the base station. Determining a first TA of the satellite based on the ambiguous position of the base station and the position of the satellite includes: determining a round-trip delay between the satellite and the ambiguous position of the base station based on the ambiguous position of the base station and the position of the satellite; determining the first TA of the satellite based on the round-trip delay between the satellite and the ambiguous position of the base station, and the round-trip delay between the ambiguous position of the base station and the position of the base station.

In the present application, the second configuration information can not only indicate the ambiguous position of the satellite, but also indicate the round-trip delay between the ambiguous position of the base station and the position of the base station. This is helpful to compensate for the delay error caused by the satellite's TA determined based on the ambiguous position of the satellite and the position of the satellite. This is helpful to improve the accuracy of the satellite's TA, and can expand the selection range of the ambiguous position of the base station, further meeting the network management requirements for the location of the base station.

In a second aspect, a parameter determination method is provided, which can be executed by a base station, or by a component of the base station (such as a processor, a chip, or a chip system, etc.), or by a logic module or software that can implement all or part of the base station functions. The method includes: verifying a satellite connected to the base station; if the satellite verification is passed, sending first configuration information to the satellite, the first configuration information is used to indicate the location of the base station, or the first configuration information is used to indicate the TA change rule of the satellite.

The location of the base station refers to the exact location of the base station, and the location of the satellite refers to the exact location of the satellite. In this application, the satellite accesses the base station as a UE. For network management considerations, the network side does not want ordinary UEs to obtain the exact location of the base station. Therefore, the base station needs to verify the identity of the accessed satellite. After the satellite is verified, the base station can send the first configuration information to the satellite, which is conducive to meeting the network management requirements for the location of the base station.

When the first configuration information indicates the location of the base station, since the indicated location of the base station is accurate, the satellite can determine the accurate round-trip delay between the satellite and the base station based on the location of the base station and the location of the satellite, and then determine the accurate second TA of the satellite based on the accurate round-trip delay between the satellite and the base station, which is conducive to the satellite obtaining an accurate TA for uplink data transmission.

When the first configuration information indicates the TA variation pattern of the satellite, since the base station can determine the satellite's motion trajectory based on the satellite's ephemeris information and since the position of the base station is known to the base station, the base station can obtain the accurate TA variation pattern of the satellite and send it to the satellite. Therefore, the satellite can obtain the accurate round-trip delay between the satellite and the base station based on the TA variation pattern of the satellite, and then determine the accurate second TA of the satellite based on the accurate round-trip delay between the satellite and the base station, which is conducive to the satellite obtaining accurate TA for uplink data transmission.

In conjunction with the second aspect, in some implementations of the second aspect, verifying the satellite accessing the base station includes: verifying the device type of the satellite. Verifying the satellite successfully includes: if the device type of the satellite is a network device, verifying the satellite successfully.

In combination with the second aspect, in certain implementations of the second aspect, the first configuration information is used to indicate the location of the base station, including: the first configuration information includes the coordinates of the exact position of the satellite; or, the first configuration information includes the difference between the coordinates of the ambiguous position of the base station and the coordinates of the location of the base station.

In the present application, when the first configuration information includes the coordinates of the location of the base station, it is helpful to reduce the calculation complexity of the satellite. When the first configuration information includes the difference between the coordinates of the fuzzy location of the base station and the coordinates of the location of the base station, it is helpful to further meet the network management requirements for the location of the base station.

In combination with the second aspect, in certain implementations of the second aspect, the method also includes: sending second configuration information to the satellite, the second configuration information is used to indicate the fuzzy position of the base station, or, the second configuration information is used to indicate the changing pattern of the public TA, or, the second configuration information is used to indicate the fuzzy position of the base station and the round-trip delay between the fuzzy position of the base station and the position of the base station, the fuzzy position of the base station is determined based on the position of the base station and a preset TA accuracy range.

In conjunction with the second aspect, in certain implementations of the second aspect, the first configuration information is used to indicate a TA change rule of the satellite. Before sending the first configuration information to the satellite, the method further includes: acquiring ephemeris information of the satellite; and determining a TA change rule of the satellite based on the ephemeris information of the satellite and a position of the base station.

In a third aspect, a parameter determination device is provided, including: a module for executing a method in any possible implementation of any of the above aspects. Specifically, the device includes a module for executing a method in any possible implementation of any of the above aspects.

In one design, the device may include a module corresponding to each of the methods/operations/steps/actions described in any of the above aspects. The module may be a hardware circuit, software, or a combination of hardware circuit and software.

In another design, the device is a communication chip, which may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

In another design, the device is a satellite or a base station, which may include a transmitter for sending information or data and a receiver for receiving information or data.

In another design, the device is used to execute the method in any possible implementation of any of the above aspects, and the device can be configured in a satellite or a base station.

In a fourth aspect, a parameter determination device is provided, comprising a processor, wherein the processor is used to call and run a computer program from a memory, so that the device executes a method in any possible implementation manner of any of the above aspects.

Optionally, the device further comprises a memory, which can be used to store instructions and data. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the methods described in the above aspects can be implemented.

Optionally, the device further includes: a transmitter (transmitter) and a receiver (receiver), and the transmitter and the receiver can be separately arranged or integrated together, which is called a transceiver (transceiver).

In a fifth aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code, or instruction), which, when executed, enables a computer to execute a method in any possible implementation of any of the above aspects.

In a sixth aspect, a computer-readable storage medium is provided, which stores a computer program (also referred to as code, or instruction) which, when executed on a computer, enables the computer to execute a method in any possible implementation of any of the above aspects.

In a seventh aspect, the present application provides a chip system comprising at least one processor for supporting the implementation of the functions involved in any of the above aspects, such as receiving or processing the data involved in the above method.

In one possible design, the chip system also includes a memory, which is used to store program instructions and data, and the memory is located inside or outside the processor.

Optionally, the chip system may consist of a chip, or may include a chip and other discrete devices.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of an IAB network communication system;

FIG2 is a schematic diagram of an IAB architecture;

FIG3 is a schematic diagram of an NCR network communication system;

4A and 4B are timing advance determination schemes adopted in the NR-NTN standard;

FIG5 is a schematic diagram of a satellite communication scenario;

FIG6 is a schematic diagram of a satellite communication scenario applicable to an embodiment of the present application;

FIG7 is a schematic diagram of an air-to-ground communication scenario applicable to an embodiment of the present application;

8 and 9 are schematic flow charts of a parameter determination method provided in an embodiment of the present application;

FIG10 is a schematic diagram of an ambiguous position of a base station in an IAB communication scenario provided by an embodiment of the present application;

FIG11 is a schematic diagram of an accurate location of a base station in an IAB communication scenario provided by an embodiment of the present application;

12 to 16 are schematic flow charts of a parameter determination method provided in an embodiment of the present application;

FIG17 is a schematic diagram of another fuzzy position of a base station in an IAB communication scenario provided in an embodiment of the present application;

18 to 20 are schematic block diagrams of a parameter determination device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical solution in this application will be described below in conjunction with the accompanying drawings.

Before introducing the parameter determination method and related devices provided in the embodiments of the present application, the following points are explained.

First, in the embodiments shown below, various terms and English abbreviations, such as configuration information, TA, and ambiguous location of base stations, are illustrative examples given for the convenience of description and should not constitute any limitation to this application. This application does not exclude the possibility of defining other terms that can achieve the same or similar functions in existing or future protocols.

Second, the first, second and various digital numbers in the embodiments shown below are only used for the convenience of description and are not used to limit the scope of the embodiments of the present application. For example, to distinguish different configuration information.

Third, "at least one" means one or more, and "more than one" means two or more. "And/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, where a, b, c can be single or multiple.

The prior art involved in this application is introduced below.

Currently, the new radio (NR) technology is evolving from R18 to R19. At the same time, NR technology has entered the commercial deployment stage from the standardization stage. The original intention of the NR standard protocol research is to design wireless communication technology for ground cellular network scenarios, which can provide users with ultra-low latency, ultra-reliability, ultra-high speed, and excessive connection wireless communication services. However, cellular networks cannot achieve seamless global coverage. For example, in areas without ground base stations such as sea areas, polar regions, and rainforests, voice and data services cannot be provided to these areas without cellular network coverage.

Compared with terrestrial communications, NTN communications have the characteristics of large coverage area and flexible networking, and can achieve seamless global network coverage. NTN network is not only a supplement to the current terrestrial network, but also an independent communication system that provides users with global high-speed network access. At present, research institutes, communication organizations, and communication companies around the world are participating in the research of NTN communication technology and standard formulation, striving to build a unified communication network for space, air, and ground communications.

NTN communication includes networking using drones, high-altitude platforms, satellites and other equipment to provide UE with data transmission, voice communication and other services. High-altitude platform equipment is generally 8 to 50 km above the ground. According to the orbital altitude of the satellite, the satellite communication system can be divided into the following three types: geostationary earth orbit (GEO) satellite communication system (also known as synchronous orbit satellite system), medium earth orbit (MEO) satellite communication system and low earth orbit (LEO) satellite communication system.

The GEO satellite orbit altitude is 35786km. Its main advantage is that it can remain stationary relative to the ground and provide a large coverage area. However, GEO satellite communications also have obvious disadvantages: 1) The GEO satellite orbit is far away from the earth, and the free space propagation loss is large, resulting in a tight communication link budget. In order to increase the transmission/reception gain, the satellite needs to be equipped with a larger diameter antenna; 2) The communication transmission delay is large, which can reach a round-trip delay of about 500ms, which cannot meet the needs of low-latency services; 3) GEO orbit resources are relatively scarce, the launch cost is high, and it cannot provide coverage for the earth's polar regions.

The orbital altitude of MEO satellites is between 2000 and 35786 km. The advantage is that a relatively small number of satellites can achieve global coverage, but its orbital altitude is higher than that of LEO, and the transmission delay of LEO satellite communication is still relatively large. Considering the advantages and disadvantages of MEO satellite communication, MEO satellites are mainly used for positioning and navigation.

The orbital altitude of LEO satellites is in the range of 300 to 2000 km. LEO satellites are lower than MEO and GEO orbital altitudes and have the advantages of smaller data transmission delay, smaller transmission loss, and lower launch cost. Therefore, LEO satellite communications have received more and more attention in recent years.

The purpose of IAB network technology is to support wireless backhaul and relay links, thereby achieving flexible and ultra-dense deployment of NR cells without proportionally encrypting the wired transmission network. The main application scenarios include but are not limited to: high cost of fiber deployment, site densification, street coverage extension and blind spot filling, indoor coverage extension and blind spot filling.

FIG1 is a schematic diagram of an IAB network communication system. The communication system includes a UE, an IAB node (IAB-node), and an IAB-donor. The IAB-donor may also be referred to as a donor base station. In the present application, "IAB network" is only an example and may be replaced by "wireless backhaul network" or "relay network". "IAB node" is also only an example and may be replaced by "wireless backhaul device", "wireless backhaul node" or "relay node".

As shown in FIG1 , the parent node of IAB node 1 includes an IAB host. IAB node 1 is also the parent node of IAB node 2 or IAB node 3. The parent node of UE 1 includes IAB node 4. The child node of IAB node 4 includes UE 1 or UE 2. The IAB node directly accessed by the terminal can be called an access IAB node. IAB node 4 in FIG1 is the access IAB node of UE 1 and UE 2. IAB node 5 is the access IAB node of UE 2.

The node on the upstream transmission path from the IAB node to the IAB host can be called the upstream node of the IAB node. The upstream node can include a parent node, a parent node of a parent node (or a grandparent node), etc. For example, IAB node 1 and IAB node 2 in Figure 1 can be called the upstream node of IAB node 5.

The node on the downlink transmission path from the IAB node to the terminal can be called the downstream node (downstream node) or the descendant node (descendant node) of the IAB node. The downstream node or the descendant node may include a child node, a child node of a child node (or a grandchild node), or a terminal, etc. For example, UE 1, UE 2, IAB node 2, IAB node 3, IAB node 4 or IAB node 5 in Figure 1 can be called the downstream node or descendant node of IAB node 1. For another example, IAB node 4 and IAB node 5 in Figure 1 can be called the downstream node or descendant node of IAB node 2. UE 1 in Figure 1 can be called the downstream node or descendant node of IAB node 4.

The uplink data packet sent by the terminal to the IAB host can be transmitted to the IAB host through one or more IAB nodes, that is, the target node of the uplink data between the terminal and the IAB host can be the IAB host. The downlink data packet sent by the IAB host to the terminal can be sent to the access IAB node of the terminal through one or more IAB nodes, and then sent to the terminal by the access IAB node, that is, the target node of the downlink data between the terminal and the IAB host can be the access IAB node.

For example, there are two available paths for data transmission between UE 1 and the IAB host, Path 1: UE 1←→IAB Node 4←→IAB Node 3←→IAB Node 1←→IAB Host. Path 2: UE 1←→IAB Node 4←→IAB Node 2←→IAB Node 1←→IAB Host. There are three available paths for data transmission between UE 2 and the IAB host, Path 1: UE 2←→IAB Node 4←→IAB Node 3←→IAB Node 1←→IAB Host, Path 2: UE 2←→IAB Node 4←→IAB Node 2←→IAB Node 1←→IAB Host, Path 3: UE 2←→IAB Node 5←→IAB Node 2←→IAB Node 1←→IAB Host.

It is understood that in the IAB network, a transmission path between a terminal and an IAB host may include one or more IAB nodes. In addition, a terminal may also directly access the IAB host, for example, UE 3 directly accesses the IAB host.

Each IAB node needs to maintain a backhaul link (BL) to the parent node. If the child node of the IAB node is a terminal, the IAB node also needs to maintain an access link (AL) between the terminal. As shown in Figure 1, the link between IAB node 4 and UE 1 or UE 2 includes AL. The link between IAB node 4 and IAB node 2 or IAB node 3 includes BL.

Figure 2 is a schematic diagram of an IAB architecture. Figure 2 takes the IAB architecture in the NR network as an example for introduction, wherein the next generation radio access network (NG-RAN) includes a base station, an IAB host, and at least one IAB node.

As shown in FIG. 2 , the IAB node includes a distributed unit (DU) functional part and a mobile termination (MT) functional part. The MT functional part of the IAB node may be referred to as an IAB-node-MT (or IAB-MT), and the DU functional part of the IAB node may be referred to as an IAB-node-DU (or IAB-DU). The IAB host may be a base station (e.g., a gNodeB) that supports IAB additional functions and is connected to the core network via a non-IAB (e.g., optical fiber). The IAB host may include a central unit (CU) functional part and at least one DU functional part. The CU functional part of the IAB host may be referred to as an IAB-donor-CU, and the DU functional part of the IAB host may be referred to as an IAB-donor-DU.

CU is the radio resource control (RRC), service data adaptation protocol (SDAP) and packet data convergence protocol (PDA) of the carrier base station (e.g., gNodeB). The logical node of the PDCP is used to carry the operation of one or more DUs.

DU is a logical node that carries the radio link control (RLC), media access control (MAC), and physical (PHY) layers of a base station (e.g., gNodeB).

The CU is connected to the DU it controls through the F1 interface. The F1 application protocol (F1AP) is used to transfer the configuration information of the radio bearers between the CU and the DU, and to establish the general packet radio service (GPRS) tunnel protocol between the DU and the CU for each radio bearer.

IAB-node-MT is connected to the DU of its parent node or the DU of the IAB host as a normal UE as a wireless transmission backhaul link. IAB-node-DU provides blind spot coverage for the pole station cell on the access side under the IAB node, and provides access for normal UE or lower-level IAB-node-MT. When accessing the IAB network, the IAB node can act as a terminal. In this case, the MT of the IAB node has the protocol stack of the terminal. There is an air interface (Uu interface) protocol stack between the IAB node and the IAB host.

The IAB host and the base station are connected through the Xn-C interface, the base station and the fifth generation mobile communication technology (5G) core network are connected through the NG interface, and the IAB-donor-CU and the 5G core network are connected through the NG interface.

The communication interface between the IAB host and the IAB node may include an air interface (Uu interface) and an F1 interface. For example, there is an air interface (Uu interface) between the MT of the IAB node and the IAB host, and there is an F1 interface between the DU of the IAB node and the IAB host. IAB supports wireless backhaul between base stations, and wireless backhaul between base stations is achieved through the Uu interface.

It should be noted that an IAB node may have one or more roles in the IAB network. For example, the IAB node can serve as a terminal role, an access IAB node role, or an intermediate IAB node role. The IAB node can use protocol stacks corresponding to different roles for different roles. When the IAB node has multiple roles in the IAB network, it can have multiple sets of protocol stacks at the same time, and each set of protocol stacks can share some of the same protocol layers, such as sharing the same RLC layer, MAC layer, and PHY layer.

IAB network technology is designed for terrestrial data transmission. In satellite communication scenarios, there may be inaccurate timing advance (TA) when the satellite (as an IAB node) accesses the base station to establish a Uu port connection, making it impossible for the IAB node to successfully access the base station.

Network controlled repeaters (NCR) are a type of network equipment similar to IAB nodes. They can be used as devices to amplify and forward base station signals when UE accesses a base station (parent node).

FIG3 is a schematic diagram of an NCR network communication system. The communication system includes a UE, a base station (e.g., a gNodeB), and an NCR. The NCR includes an MT (NCR-MT) functional part and a forwarding functional part (NCR-forwarding, or NCR-fwd). The NCR-MT can receive control information (side information) sent by the base station through a control link (Uu port). The control information is used to control the behavior of the NCR-fwd. The control information includes beam indication direction, forwarding on and off, and power control.

NCR technology is designed for terrestrial data transmission. In satellite communication scenarios, there will be inaccurate TA when the satellite (as NCR) accesses the base station to establish a Uu port connection, making it impossible for NCR to successfully access the base station.

FIG4A and FIG4B are timing advance determination schemes adopted in the NR-NTN (NR and NTN integrated network) standard. According to whether it has global navigation satellite system (GNSS) capability, UE can be divided into UE with GNSS capability and UE without GNSS capability. UE without GNSS capability cannot evaluate the propagation delay between UE and satellite. For UE with GNSS capability, since UE knows its own position and satellite ephemeris information, it can automatically evaluate the TA between UE and satellite before performing physical random access channel (PRACH) transmission. Depending on the link compensated by UE, there are two optional schemes: Scheme 1, UE compensates for the delay of service link and feeder link; Scheme 2, UE only compensates for the delay of service link.

The above two solutions have their own advantages and disadvantages, so a compromise solution is considered, that is, to define an uplink time synchronization reference point (hereinafter referred to as the reference point), and the base station specifies the value of the UE compensation delay. If the reference point is at the NTN gateway, as shown in Figure 4A, the reference point is located at the NTN gateway (the NTN gateway is together with the base station or is close to the location), and the UE compensates for all delays including the service link and the feeder link. The downlink frame and the uplink frame are aligned at the base station. If the reference point is at the satellite, the UE only compensates for the delay of the service link. If the reference point is at a point between the satellite and the NTN gateway, as shown in Figure 4B, the reference point is located between the satellite and the NTN gateway (the NTN gateway is together with the base station or is close to the location), the UE compensates for the delay including the service link and part of the feeder link, and the downlink frame and the uplink frame are not aligned at the base station.

After the reference point is introduced, the base station needs to provide a public TA to the UE. The main function of the public TA is to compensate for the distance from the reference point to the satellite. In FIG. 4A or FIG. 4B , the base station/satellite broadcasts ephemeris information, common TA, common TA drift, common TA drift rate, and TA offset to the UE.

The UE calculates T _TA according to its own position and the following formula. T _TA is used to send a random access preamble and subsequently send uplink data.

Wherein, N _TA represents the TA adjustment amount (closed loop indication), and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode, for example, the conversion time from uplink reception to downlink transmission in TDD mode. It represents the round-trip delay between the satellite and the reference point, which can be determined according to the common TA configured by the base station, the rate of change of the common TA, and the rate of change of the rate of change of the common TA. Indicates the round-trip delay between UE and satellite.

In the satellite communication scenario shown in FIG5, the satellite communicates with the base station as an IAB node. In this application, the NTN network using the IAB technology may be referred to as an NTN-IAB network. The satellite communication scenario shown in FIG5 includes IAB node 1, IAB node 2, IAB node 3 and a base station. When the satellite applies to access the base station as a UE, the satellite does not know the location of the base station and cannot accurately determine the round-trip delay between the satellite and the base station. Therefore, there is a problem that the satellite cannot obtain an accurate TA for uplink data transmission.

In addition, if the distance between satellites is large (such as multiple layers of satellites), the base station cannot support the simultaneous access of satellites with large delay differences when broadcasting a public TA to the UE. For example, IAB node 1 in Figure 5 is far away from the base station, and the round-trip delay between the base station and the base station is large. The public TA may not be able to support IAB node 1 accessing the base station. IAB node 2 is close to the base station, and the round-trip delay between the base station and the base station is small. The public TA can support IAB node 2 accessing the base station. Even if broadcasting a public TA can support satellites that are close to each other to access the base station at the same time, the public TA and its change rate cannot accurately reflect the TA changes of the backhaul link. Therefore, after access, the base station needs to frequently close the loop to indicate the TA adjustment amount.

In the NR-NTN scenario, the base station/satellite can send ephemeris information and a common TA to the UE, where the ephemeris information indicates the location information of the satellite serving the UE over a period of time.

In the NTN-IAB scenario shown in Figure 5, the base station can send ephemeris information and public TA to the satellite (as an IAB node). The ephemeris information here indicates the position of the satellite accessing the base station, or indicates the position of the base station. The position of the base station indicated by the ephemeris information is the fuzzy position of the base station. When the satellite knows one of its own position or the position of the base station, it cannot calculate the round-trip delay between the satellite and the base station. After the satellite accesses the base station, the base station needs to frequently indicate the TA adjustment amount in a closed loop, which results in a large signaling overhead.

It should be noted that the accurate location of the base station broadcast by the base station does not meet the network management requirements. Therefore, the location of the base station indicated in the ephemeris information broadcast by the base station is the fuzzy location of the base station. The accurate location of the base station can also be described as the real location of the base station. The fuzzy location of the base station is a description relative to the accurate location of the base station. There is a deviation between the fuzzy location of the base station and the accurate location of the base station.

Combined with the above description, in the NTN-IAB scenario shown in FIG5 , the satellite (as an IAB node) can access the base station as a UE for communication. However, the satellite cannot obtain the accurate TA for uplink data transmission. Similarly, in the NTN communication scenario using NCR technology, there is also the problem that the satellite (as an NCR) cannot obtain the accurate TA for uplink data transmission.

In view of this, an embodiment of the present application provides a parameter determination method, where the base station can verify the satellite after the satellite accesses the base station, and send first configuration information to the satellite after the verification is passed, and the first configuration information is used by the satellite to determine an accurate TA for uplink data transmission. The parameter determination method of the present application is conducive to the satellite obtaining an accurate TA for data transmission, and can also meet the network management requirements for the location of the base station.

FIG6 is a schematic diagram of a satellite communication scenario applicable to an embodiment of the present application. As shown in FIG6 , the network equipment in the satellite communication scenario includes a satellite, a gateway station/signal gateway station (NTN gateway) and a base station. The user terminal includes an Internet of Things terminal, and may also be a terminal of other forms and performances, such as a mobile phone terminal, a high-altitude aircraft, etc., which are not limited here. The link between the satellite and the user terminal is called a service link, and the link between the satellite and the gateway station/signal gateway station is called a feeder link. In addition, the base station is connected to the core network. The technical solution of the present application can also be applied to a multi-satellite communication scenario that expands the scenario shown in FIG6.

Satellites can be divided into transparent mode and regenerative mode according to their working modes. When the satellite works in transparent mode, the satellite has the function of intermediate forwarding, and the gateway station/signal gateway station has the function of a base station or part of the functions of a base station. In this case, the gateway station/signal gateway station can be regarded as a base station, or the base station can be deployed separately from the gateway station/signal gateway station. Then the delay of the feeder link includes the delay between the satellite and the gateway station/signal gateway station and the delay between the gateway station/signal gateway station and the base station. When the satellite works in regenerative mode, the satellite has data processing capabilities and has the functions of a base station or part of the functions of a base station. In this case, the satellite can be regarded as a base station. Alternatively, the base station can be deployed separately from the gateway station/signal gateway station. In this case, the delay of the feeder link includes the delay between the satellite and the gateway station/signal gateway station and the delay between the gateway station/signal gateway station and the base station. The satellite is regarded as a base station.

In the embodiment of the present application, the transparent transmission mode of the satellite is taken as an example, where the gateway station/signaling station and the base station are together or close to each other. In this case, the delay of the feeder link can be approximated as the delay between the satellite and the gateway station/signaling station. For the case where the gateway station/signaling station is far away from the base station, the delay between the satellite and the gateway station/signaling station and the delay between the gateway station/signaling station and the base station is the delay of the feeder link.

The embodiment of the present application is also applicable to the air-to-ground communication scenario as shown in FIG7. As shown in FIG7, the network equipment in the air-to-ground communication scenario includes a base station, and the user terminal includes a high-altitude aircraft, an on-board handheld terminal, etc.

In the embodiment of the present application, the satellite serving as an IAB node or NCR may be regarded as a user terminal in a satellite communication scenario as shown in FIG. 6 , or a user terminal in an air-to-ground communication scenario as shown in FIG. 7 .

FIG8 is a schematic flow chart of a parameter determination method 800 provided in an embodiment of the present application. The steps of the method 800 can be interactively executed by a satellite and a base station. The satellite, as an IAB node or NCR, can access the base station as a user terminal. The method 800 includes S801 to S804, and the specific steps are as follows:

S801, a satellite accesses a base station based on a first TA.

The satellite can access the base station by executing the random access process. The first step of random access includes the satellite sending a random access preamble to the base station. In order to make the uplink data sent by the satellite reach the base station within the desired time window and realize the uplink timing synchronization of the base station, the satellite needs to send the data packet in advance when sending uplink data to the base station. This advance time is TA.

In the embodiment of the present application, the TA of the satellite indicates the time in advance when the satellite needs to send a data packet when sending uplink data to the base station. This time includes the round-trip delay between the satellite and the base station. When the satellite knows its own position and the accurate position of the base station, the satellite can determine the accurate round-trip delay between the satellite and the base station, and then determine the accurate TA of the satellite. When the satellite is unknown to the base station, or the known position of the base station is fuzzy, the satellite cannot determine the accurate round-trip delay between the satellite and the base station, so the obtained TA of the satellite is inaccurate.

The TA of the satellite involved in the embodiment of the present application includes the first TA of the satellite and the second TA of the satellite, wherein the first TA is the initial TA used by the satellite to access the base station, which can be used to send a random access preamble for random access. The second TA is the TA updated after the satellite accesses the base station. The updated second TA of the satellite is more accurate than the first TA of the satellite.

When the satellite initially accesses the base station, the satellite does not obtain the position of the base station, or the satellite obtains an ambiguous position of the base station. Therefore, the first TA of the satellite is inaccurate.

It should be noted that the location of the base station in the embodiments of the present application refers to the accurate location of the base station, which can also be described as the real location of the base station. When the satellite accesses the base station as a UE, for network management considerations, the base station does not broadcast its accurate location to the satellite, but broadcasts the fuzzy location of the base station to the satellite. The fuzzy location of the base station is a location different from the accurate location of the base station, that is, there is a deviation between the fuzzy location of the base station and the accurate location of the base station.

S802: The base station verifies the satellite connected to the base station.

After the satellite accesses the base station, the base station can verify the accessed satellite.

Optionally, S802 specifically includes:

The type of equipment used by the base station to acquire satellites;

The base station verifies the satellite's equipment type.

The following takes the four-step random access process as an example to describe the process of the base station acquiring the device type of the satellite.

In a possible implementation, after the satellite receives message 4 sent by the base station, the base station may send a first request message to the satellite, where the first request message is used to request the device type of the satellite. After receiving the first request message, the satellite sends a first response message to the base station, where the first response message is used to indicate the device type of the satellite.

In another possible implementation, the base station may carry the second request message in message 2 or message 4 in the random access process and send it to the satellite, where the second request message is used to request the device type of the satellite.

In another possible implementation, the satellite may send the device type to the base station in message 1 or message 3 during the random access process without a request from the base station.

After obtaining the device type of the satellite, the base station can verify it. If the device type of the satellite is a network device, the base station verifies the satellite successfully and executes S803 and subsequent operations. If the device type of the satellite is not a network device (there may be a device type reporting error), the base station fails to verify the satellite. In this case, the base station can instruct the satellite to continue to use the first TA for uplink data transmission; or the base station sends information for updating the TA to the satellite, but the information for updating the TA fails. The TA information does not involve the exact location of the base station (such as the second configuration information below), thereby meeting the network management requirements for the exact location of the base station.

S803, when the satellite is verified, the base station sends first configuration information to the satellite, where the first configuration information is used to indicate the location of the base station, or the first configuration information is used to indicate a change rule of the timing advance TA of the satellite. Correspondingly, the satellite receives the first configuration information.

When the base station verifies the satellite and determines that the accessed satellite is not an ordinary UE but a network device, it sends the first configuration information to the satellite. The location of the base station in the first configuration information refers to the accurate location of the base station, and the TA change law of the satellite indicates the change law of the TA of the satellite during the movement, which can also be called the UE-level change law. It can include UE-level TA (TA_UE), TA change rate (TA_rate), and TA change rate change rate (TA_rate_rate).

The base station can determine the motion trajectory of the satellite according to the ephemeris information of the satellite, and the position of the base station is known to the base station. Therefore, the base station can determine the TA change rule of the satellite according to the position of the base station and the ephemeris information of the satellite.

It should be understood that when the first configuration information is used to indicate the position of the base station, the satellite can determine the accurate round-trip delay between the satellite and the base station based on the position of the base station. Alternatively, when the first configuration information is used to indicate the TA change rule of the satellite, since the TA change rule of the satellite is determined based on the ephemeris information of the satellite, it is more targeted for each satellite. Therefore, the satellite can determine the accurate round-trip delay between the satellite and the base station based on the TA change rule of the satellite.

Optionally, before S801, method 800 further includes: the base station sends second configuration information to the satellite; and the satellite determines a first TA of the satellite based on the second configuration information.

Among them, the second configuration information is used to indicate the fuzzy position of the base station, or the second configuration information is used to indicate the changing pattern of the public TA, or the second configuration information is used to indicate the fuzzy position of the base station and the round-trip delay between the fuzzy position of the base station and the position of the base station, and the fuzzy position of the base station is determined based on the position of the base station and a preset TA accuracy range.

In an embodiment of the present application, before accessing the base station, the satellite may receive second configuration information from the base station, determine the first TA based on the second configuration information, and access the base station using the first TA.

When the second configuration information is used to indicate the ambiguous position of the base station, the satellite cannot accurately determine the round-trip delay between the satellite and the base station based on the ambiguous position of the base station, so the first TA of the satellite obtained is inaccurate. Alternatively, when the second configuration information is used to indicate the change law of the common TA, since the change law of the common TA is the change law of the TA of the reference point selected by the base station, it is impossible to accurately describe the change law of the TA of each satellite. Therefore, the satellite cannot accurately determine the round-trip delay between the satellite and the base station based on the change law of the common TA, so the first TA of the satellite obtained is inaccurate. Alternatively, when the second configuration information is used to indicate the ambiguous position of the base station and the round-trip delay between the ambiguous position of the base station and the position of the base station, although the round-trip delay between the ambiguous position of the base station and the position of the base station can make up for part of the delay error, the sum of the round-trip delay between the satellite and the ambiguous position of the base station and the round-trip delay between the ambiguous position of the base station and the base station is obtained, the round-trip delay between the satellite and the base station cannot be accurately determined, so the first TA of the satellite obtained is inaccurate.

The specific process of the satellite determining the first TA of the satellite based on the second configuration information can be found in the description of Figures 9 to 17 below, which will not be described in detail here.

S804: The satellite determines a second TA of the satellite based on the first configuration information, where the second TA is used for uplink data transmission by the satellite.

In an embodiment of the present application, when the satellite is at an unknown base station location (accurate location), it can use the first TA to initially access the base station. After accessing the base station, the base station sends the first configuration information to the satellite if the satellite is verified. This can help the satellite determine the accurate TA for uplink data transmission under the premise of meeting the network management requirements of the base station location on the network side, increase the probability of the base station receiving the satellite's uplink data within the range of the cyclic prefix (CP), and thus improve the channel coding and decoding efficiency of the base station.

The specific process of the satellite determining the second TA of the satellite based on the first configuration information can be found in the description of Figures 9 to 17 below, which will not be described in detail here.

The accurate location of the base station in the embodiment of the present application can also be understood as the location information of the base station that can provide more accurate TA than the fuzzy location information, or it means that compared with the fuzzy location, the distance difference between the accurate location and the base station is smaller than the distance difference between the fuzzy location and the base station.

9 to 17 , a process in which the satellite determines the first TA according to the second configuration information and determines the second TA according to the first configuration information is described in detail below.

FIG9 is a schematic flow chart of another parameter determination method 900 provided in an embodiment of the present application. The first configuration information in method 800 indicates the location of the base station to determine the second TA of the satellite, and the second configuration information in method 800 indicates the fuzzy location of the base station to determine the first TA of the satellite. The location of the base station refers to the accurate location of the base station.

The method 900 includes S901 to S906, and the specific steps are as follows:

S901: The base station sends the fuzzy position of the base station to the satellite. Correspondingly, the satellite receives the fuzzy position of the base station.

The base station sends the fuzzy position of the base station to the satellite, including: the base station broadcasts the fuzzy position of the base station. Since the base station broadcasts the fuzzy position of the base station, it meets the network management requirements of the network side for the position of the base station. Figure 10 is a schematic diagram of the fuzzy position of a base station in an IAB communication scenario provided by an embodiment of the present application. The IAB communication scenario shown in Figure 10 includes IAB node 1, IAB node 2 and a base station. It can be seen from Figure 10 that the fuzzy position of the base station is not the same as the position of the base station. After receiving the fuzzy position of the base station broadcast by the base station, the satellite can determine its TA to the base station based on its own position and the fuzzy position of the base station.

S902: The satellite determines a first TA of the satellite based on the ambiguous position of the base station and the position of the satellite.

The position of a satellite refers to the exact position of the satellite. The satellite can determine the position of the satellite based on the ephemeris information.

Exemplarily, the position of the satellite and the fuzzy position of the base station are expressed in the form of (x, y, z) coordinates. The base station sends the fuzzy position of the base station to the satellite in the form of (x, y, z) coordinates.

In this step, the satellite can determine the round-trip delay between the satellite and the base station based on the fuzzy position of the base station and the position of the satellite, which is recorded as Furthermore, the satellite can determine the first TA of the satellite according to the following formula, denoted as T _TA,1 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Represents the round-trip delay between the network device and the reference point (see the reference point in Figure 4A or 4B). represents the round-trip delay between the satellite and the base station. _Tc represents the time unit. The base station can be configured is 0, or the base station does not send to the satellite The value of the parameter N _TA and N _TA,offset can be configured by the base station.

It should be understood that the round-trip delay between the satellite and the base station determined here is In fact, it is the round-trip delay between the fuzzy position of the satellite and the base station, rather than the round-trip delay between the accurate position of the satellite and the base station. Therefore, T _TA,1 obtained based on the above formula is inaccurate.

S903: The satellite accesses the base station based on the first TA.

The satellite sends a random access preamble and other data to the base station in advance of the time corresponding to the first TA for random access. After receiving the random access preamble from the satellite, the base station establishes a basic signaling connection with the satellite to complete the random access.

S904: The base station verifies the connected satellite.

Optionally, the satellite may be verified on the radio access network (RAN) side or the core network of the base station, for example, by the operations, administration or maintenance (OAM) function of the RAN side of the base station. For another example, the satellite may be verified by the access and mobility management function (AMF) of the core network, and the core network may send the verification result to the base station.

Optionally, the base station may verify the device type of the satellite. For details, please refer to the description of S802, which will not be repeated here.

S905, after the base station passes the satellite verification, it sends the accurate position of the base station to the satellite. Correspondingly, the satellite receives the accurate position of the base station. The accurate position of the base station can also be understood as the position information of the base station that can provide more accurate TA than the fuzzy position information. Or it means that compared with the fuzzy position, the distance difference between the accurate position and the base station is smaller than the distance difference between the fuzzy position and the base station.

Optionally, the base station may send the exact location of the base station to the satellite after verifying that the satellite is a network device.

S906: The satellite determines a second TA of the satellite based on the accurate position of the base station and the position of the satellite.

The position of the satellite refers to the exact position of the satellite. The satellite can determine the position of the satellite based on the ephemeris information. Figure 11 is a schematic diagram of the exact position of a base station in an IAB communication scenario provided by an embodiment of the present application. The IAB communication scenario shown in Figure 11 includes IAB node 1, IAB node 2 and a base station. When the base station sends the exact position of the base station to the satellite, the satellite can determine the exact round-trip delay between the satellite and the base station based on the exact position of the base station and the position of the satellite, and then determine the second TA of the satellite. The second TA obtained in this way is more accurate than the first TA.

Similar to the satellite determining the first TA in S902, the satellite first determines the round-trip delay between the satellite and the base station based on the accurate position of the base station and the position of the satellite, which is recorded as Furthermore, the satellite can determine the second TA of the satellite according to the following formula, denoted as T _TA,2 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Represents the round-trip delay between the network device and the reference point (see the reference point in Figure 4A or 4B). express The round trip delay between the satellite and the base station. _Tc represents the time unit. The base station can be configured is 0, or the base station does not send to the satellite The value of N _TA and the value of N _TA,offset can be configured by the base station.

It should be understood that due to It is determined based on the accurate location of the base station and the location of the satellite. It indicates the round-trip delay between the exact position of the satellite and the base station. Therefore, T _TA,2 obtained based on the above formula is a more accurate TA value than T _TA,1 .

Optionally, the fuzzy position of the base station can be determined based on the accurate position of the base station and a preset TA accuracy range. For example, the base station first selects a fuzzy position, and then the base station calculates a TA based on the fuzzy position of the base station and the position of the satellite. At the same time, the base station calculates a TA based on the accurate position of the base station and the position of the satellite. The base station compares the difference between the two TAs. If the difference between the two TAs is within the preset TA accuracy range, for example, the difference between the two TAs is less than a preset threshold, the base station can send the fuzzy position to the satellite. This is conducive to reducing the error between the first TA determined based on the fuzzy position of the satellite and the accurate TA for uplink data transmission by the satellite. Among them, the base station can receive ephemeris information from the satellite, determine the position of the satellite based on the ephemeris information of the satellite, or select different possible satellite positions within the coverage range of the base station for calculation and verification.

In the embodiment of the present application, the base station sends the fuzzy position of the base station to the satellite before verifying the satellite, which meets the network management requirements of the network for the position of the base station. After the base station verifies the accessed satellite, the base station can send the accurate position of the base station to the satellite, which is conducive to the satellite to determine a more accurate TA for uplink data transmission.

FIG12 is a schematic flow chart of another parameter determination method 1200 provided in an embodiment of the present application. Method 1200 describes a specific implementation of determining the second TA of a satellite by using the position difference between the position of a base station indicated by the first configuration information in method 800 and the fuzzy position of the base station, and determining the first TA of a satellite by using the fuzzy position of a base station indicated by the second configuration information in method 800. The position of a base station refers to the accurate position of the base station.

The method 1200 includes S1201 to S1206, and the specific steps are as follows:

S1201: A base station sends an ambiguous position of the base station to a satellite, and the satellite receives the ambiguous position of the base station accordingly.

S1202: The satellite determines a first TA of the satellite based on the ambiguous position of the base station and the position of the satellite.

In this step, the satellite can determine the round-trip delay between the satellite and the base station based on the fuzzy position of the base station and the position of the satellite, which is recorded as Furthermore, the satellite can determine the first TA of the satellite according to the following formula, denoted as T _TA,1 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Indicates the round-trip delay between a network device and a reference point. represents the round-trip delay between the satellite and the base station. _Tc represents the time unit. The base station can be configured is 0, or the base station does not send to the satellite The value of N _TA and the value of N _TA,offset can be configured by the base station.

S1203: The satellite accesses the base station based on the first TA.

S1204: The base station verifies the connected satellite.

S1201 to S1204 are similar to the description of S901 to S904 above, and will not be repeated here.

S1205: After the base station verifies the satellite, it sends position difference information to the satellite, where the position difference information indicates the position difference between the accurate position of the base station and the ambiguous position of the base station. Correspondingly, the satellite receives the position difference information.

Optionally, the position difference information also indicates a direction parameter of the position difference, for example, when the direction parameter of the position difference is "0", the coordinates of the position difference = the coordinates of the accurate position of the base station - the coordinates of the fuzzy position of the base station. When the direction parameter of the position difference is "1", the coordinates of the position difference = the coordinates of the fuzzy position of the base station - the coordinates of the accurate position of the base station.

Optionally, the default direction parameter of the position difference is agreed upon by the protocol to be "0" or "1", that is, when the direction parameter of the position difference is not sent, the default parameter is used.

For example, the coordinates of the accurate position of the base station are (x0, y0, z0), the coordinates of the fuzzy position of the base station are (x1, y1, z1), and the position difference is expressed in the form of coordinates as (△x, △y, △z). When the direction parameter of the position difference is "0", △x=x0-x1, △y=y0-y1, △z=z0-z1; when the direction parameter of the position difference is "1", △x=x1-x0, △y=y1-y0, △z=z1-z0.

Optionally, the direction parameter of the position difference may not be indicated in the position difference information, and the satellite and the base station negotiate in advance or agree through a protocol that the coordinates of the default position difference = the coordinates of the accurate position of the base station - the coordinates of the ambiguous position of the base station; or, the coordinates of the default position difference = the coordinates of the ambiguous position of the base station - the coordinates of the accurate position of the base station.

S1206: The satellite determines a second TA of the satellite based on the position difference information, the ambiguous position of the base station and the position of the satellite.

After receiving the position difference information, the satellite has already acquired the fuzzy position of the base station in S1201, so the satellite can determine the accurate position of the base station based on the position difference information and the fuzzy position of the base station. The accurate position of the base station can also be understood as the position information of the base station that can provide more accurate TA than the fuzzy position information. Or it means that compared with the fuzzy position, the distance difference between the accurate position and the base station is smaller than the distance difference between the fuzzy position and the base station.

Combined with the description in S1205, when the satellite determines the exact position of the base station based on the position difference information and the ambiguous position of the base station, if the received position difference information also indicates the direction parameter of the position difference, the satellite determines the exact position of the base station based on the position difference, the direction parameter of the position difference and the ambiguous position of the base station.

For example, the direction parameter of the position difference is "0", the coordinates of the position difference are (△x, △y, △z), and the coordinates of the ambiguous position of the base station are (x1, y1, z1). Then the coordinates of the accurate position of the base station = the coordinates of the ambiguous position of the base station + the coordinates of the position difference, that is, the coordinates of the accurate position of the base station are (x1+△x, y1+△y, z1+△z).

For example, the direction parameter of the position difference is "1", the coordinates of the position difference are (△x, △y, △z), and the coordinates of the ambiguous position of the base station are (x1, y1, z1). Then the coordinates of the accurate position of the base station = the coordinates of the ambiguous position of the base station - the coordinates of the position difference, that is, the coordinates of the accurate position of the base station are (x1-△x, y1-△y, z1-△z).

After obtaining the accurate position of the base station, the satellite can further determine the round-trip delay between the satellite and the base station based on the accurate position of the base station and the position of the satellite, which is recorded as Furthermore, the satellite can determine the second TA of the satellite according to the following formula, denoted as T _TA,2 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Represents the round-trip delay between the network device and the reference point (see the reference point in Figure 4A or 4B). represents the round-trip delay between the satellite and the base station. _Tc represents the time unit. The base station can be configured is 0, or the base station does not send to the satellite The value of N _TA and the value of N _TA,offset can be configured by the base station.

In the embodiment of the present application, the base station sends the fuzzy position of the base station to the satellite before verifying the satellite, so as to meet the network management requirements of the network for the location of the base station. After the base station verifies the accessed satellite, the base station can send the position difference information to the satellite, and the satellite can determine the exact position of the base station based on the position difference information, which is conducive to the satellite determining a more accurate TA for uplink data transmission. In addition, this method of indicating the exact position of the base station by the position difference is conducive to saving signaling overhead.

13 is a schematic flow chart of another parameter determination method 1300 provided in an embodiment of the present application. Method 1300 describes a specific implementation of determining the second TA of a satellite by indicating the TA change rule of the satellite through the first configuration information in method 800, and determining the first TA of a satellite by indicating the ambiguous position of a base station through the second configuration information in method 800.

The method 1300 includes S1301 to S1308, and the specific steps are as follows:

S1301: A base station sends an ambiguous position of the base station to a satellite, and the satellite receives the ambiguous position of the base station accordingly.

S1302: The satellite determines a first TA of the satellite based on the ambiguous position of the base station and the position of the satellite.

In this step, the satellite can determine the round-trip delay between the satellite and the base station based on the fuzzy position of the base station and the position of the satellite, which is recorded as Furthermore, the satellite can determine the first TA of the satellite according to the following formula, denoted as T _TA,1 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Represents the round-trip delay between the network device and the reference point (see the reference point in Figure 4A or 4B). represents the round trip delay between the satellite and the fuzzy position of the base station. _Tc represents the time unit. The base station can be configured is 0, or the base station does not send to the satellite The value of the parameter N _TA and N _TA,offset can be configured by the base station.

S1303: The satellite accesses the base station based on the first TA.

S1304: The base station verifies the satellite.

The implementation process of S1301 to S1304 is similar to the description of S901 to S904, and will not be repeated here.

S1305: After verifying the satellite, the base station determines the TA variation rule of the satellite according to the satellite ephemeris information and the position of the base station.

In the NR communication scenario, the base station sends the beam/cell-level TA, TA change rate, and TA change rate to the UE. This is because the base station cannot predict the UE's motion trajectory and cannot determine the UE-level TA change rule. In the satellite communication scenario of the embodiment of the present application, when the satellite acts as an IAB node or NCR and communicates with the base station as a UE, the base station can determine the motion trajectory of the UE (i.e., the satellite) based on the satellite's ephemeris information, and because the base station's position is known to the base station, the base station can In order to obtain the accurate UE-level TA variation law, that is, the accurate satellite TA variation law.

S1306: The base station sends the satellite's TA variation rule to the satellite. Correspondingly, the satellite receives the satellite's TA variation rule.

S1307: The satellite determines a second TA of the satellite based on a TA variation rule of the satellite.

The satellite calculates the one-way delay Delay_satellite(t) between the satellite and the base station based on the following formula:

Among them, TA _UE represents TA at the UE level, TA _rate represents the change rate of TA at the UE level, TA _{rate_rate} represents the change rate of the change rate of TA at the UE level, t represents the time of sending the signal or using TA or the time when the predicted signal arrives at the base station, and t _epoch represents the reference time point sent by the base station.

The satellite determines the round-trip delay between the satellite and the base station based on Delay_satellite(t). For example,

Furthermore, the satellite can determine the second TA of the satellite according to the following formula, denoted as T _TA,2 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Represents the round-trip delay between the network device and the reference point (see the reference point in Figure 4A or 4B). represents the round-trip delay between the satellite and the base station. _Tc represents the time unit. The base station can be configured is 0, or the base station does not send to the satellite The value of N _TA and the value of N _TA,offset can be configured by the base station.

It should be understood that since the TA variation law of the satellite is determined according to the satellite's motion trajectory, the round-trip delay between the satellite and the base station obtained based on the TA variation law of the satellite is More accurate, and thus T _TA,2 obtained based on the above formula is a more accurate TA value than T _TA,1 .

Optionally, before the base station determines the TA variation rule of the satellite according to the ephemeris information of the satellite and the position of the base station, the method 1300 further includes S1308: the satellite sends the ephemeris information to the base station. Accordingly, the base station receives the ephemeris information.

In one possible case, the base station does not know the ephemeris information of the satellite, and therefore needs the satellite to send the ephemeris information. The sending of the ephemeris information by the satellite may be actively initiated by the satellite, for example, the satellite periodically sends the ephemeris information. Alternatively, the sending of the ephemeris information by the satellite is actively initiated by the base station, for example, the base station sends a message to the satellite for requesting the ephemeris information, and after receiving the message for requesting the ephemeris information, the satellite sends the ephemeris information of the satellite to the base station.

In another possible case, the base station already knows the ephemeris information of the satellite, so when the satellite does not send the ephemeris information to the base station, the base station can also obtain the ephemeris information of the satellite.

In the embodiment of the present application, the base station sends the fuzzy position of the base station to the satellite before verifying the satellite, so as to meet the network management requirements of the network for the position of the base station. After the base station verifies the accessed satellite, the base station can send the satellite's TA change law to the satellite, and the satellite can determine a more accurate TA based on the satellite's TA change law. In addition, since the base station calculates the satellite's TA change law and sends it to the satellite, this helps to reduce the calculation complexity of the satellite.

14 is a schematic flow chart of another parameter determination method 1400 provided in an embodiment of the present application. Method 1400 describes the specific implementation of determining the second TA of a satellite by indicating the change rule of the TA of the satellite through the first configuration information in method 800, and determining the first TA of a satellite by indicating the change rule of the common TA through the second configuration information in method 800.

The method 1400 includes S1401 to S1409, and the specific steps are as follows:

S1401, the base station determines a change rule of the public TA based on the location of the base station and the location of a set reference point.

The changing rules of common TA include common TA, common TA rate, and common TA rate rate. The reference point is a reference point determined by the base station according to its coverage range. In other words, the reference point is within the coverage range of the base station.

S1402: The base station sends a change rule of the public TA to the satellite. Correspondingly, the satellite receives the change rule of the public TA.

S1403: The satellite determines a first TA of the satellite based on a change rule of the public TA.

The satellite calculates the one-way delay Delay_common(t) between the reference point and the base station based on the common TA, the rate of change of the common TA, and the rate of change of the rate of change of the common TA using the following formula:

Among them, TA _common means public TA, represents the rate of change of the public TA, represents the rate of change of the public TA, t represents the time of sending the signal or using the TA or the time when the signal is expected to arrive at the base station, and t _epoch represents the base station The reference time point for sending.

The satellite determines the round-trip delay between the reference point and the base station based on Delay_common(t), which is recorded as For example,

Furthermore, the satellite can determine the first TA of the satellite according to the following formula, denoted as T _TA,1 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Represents the round-trip delay between the reference point (see the reference point in FIG. 4A or 4B ) and the base station. represents the round-trip delay between the satellite and the base station. _Tc represents the time unit. The base station may not broadcast ephemeris information or location information, or the base station and the satellite may agree in advance to calculate the initial TA time. is 0. The value of N _TA and the value of N _TA,offset can be configured by the base station.

It should be understood that the variation law of the public TA describes the variation law of the TA of the reference point selected by the base station, and cannot accurately describe the variation law of the TA of each satellite. Therefore, the round-trip delay between the reference point and the base station obtained by the satellite based on the variation law of the public TA is There may be a deviation from the actual round-trip delay between the satellite and the base station, and thus T _TA,1 determined based on the above formula may be inaccurate.

S1404: The satellite accesses the base station based on the first TA.

This step is similar to the description of S903 above and will not be repeated here.

S1405: The base station verifies the connected satellite.

This step is similar to the description of S904 above and will not be repeated here.

S1406: After verifying the satellite, the base station determines the TA variation rule of the satellite according to the satellite ephemeris information and the position of the base station.

S1407: The base station sends the satellite's TA variation rule to the satellite. Correspondingly, the satellite receives the satellite's TA variation rule.

S1408: The satellite determines a second TA of the satellite based on a TA variation rule of the satellite.

The satellite calculates the one-way delay Delay_satellite(t) between the satellite and the base station based on the following formula:

Among them, TA _UE represents TA at the UE level, TA _rate represents the change rate of TA at the UE level, TA _{rate_rate} represents the change rate of the change rate of TA at the UE level, t represents the time of sending the signal or using TA or the time when the predicted signal arrives at the base station, and t _epoch represents the reference time point sent by the base station.

The satellite determines the round-trip delay between the satellite and the base station based on Delay_satellite(t). For example,

Furthermore, the satellite can determine the second TA of the satellite according to the following formula, denoted as T _TA,2 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Represents the round-trip delay between the network device and the reference point (see the reference point in Figure 4A or 4B). represents the round-trip delay between the satellite and the base station. _Tc represents the time unit. The base station and the satellite can negotiate in advance is 0. The value of N _TA and the value of N _TA,offset can be configured by the base station.

S1406 to S1408 are similar to the description of S1305 to S1307 above, and will not be repeated here.

Optionally, before the base station determines the TA variation rule of the satellite according to the ephemeris information of the satellite and the position of the base station, the method 1400 further includes S1409: the satellite sends the ephemeris information to the base station. Accordingly, the base station receives the ephemeris information.

In the embodiment of the present application, the base station sends the change rule of the public TA to the satellite before verifying the satellite, so that the existing signaling interface can be used to save signaling overhead. After the base station verifies the accessed satellite, the base station can send the satellite's TA change rule to the satellite, and the satellite can determine a more accurate TA based on the satellite's TA change rule.

FIG15 is a schematic flow chart of another parameter determination method 1500 provided in an embodiment of the present application. Method 1500 describes a specific implementation of determining the second TA of a satellite by indicating the position of a base station through the first configuration information in method 800, and determining the first TA of a satellite by indicating the change rule of a common TA through the second configuration information in method 800. The position of a base station refers to the exact position of the base station.

The method 1500 includes S1501 to S1507, and the specific steps are as follows:

S1501, the base station determines a change rule of the public TA based on the location of the base station and the location of a set reference point.

S1502: The base station sends a change rule of the public TA to the satellite. Correspondingly, the satellite receives the change rule of the public TA.

S1503: The satellite determines a first TA of the satellite based on a change rule of the public TA.

S1501 to S1503 are similar to the description of S1401 to S1403 above, and will not be repeated here.

S1504: The satellite accesses the base station based on the first TA.

This step is similar to the description of S903 above and will not be repeated here.

S1505: The base station verifies the connected satellite.

This step is similar to the description of S904 above and will not be repeated here.

S1506: After verifying the satellite, the base station sends the accurate position of the base station to the satellite. Correspondingly, the satellite receives the accurate position of the base station.

S1507: The satellite determines a second TA of the satellite based on the accurate position of the base station and the position of the satellite.

S1506 and S1507 are similar to the description of S905 and S906 above, and are not repeated here.

The accurate location of a base station can also be understood as the location information of a base station that can provide more accurate TA than the ambiguous location information. Or it means that compared with the ambiguous location, the distance difference between the accurate location and the base station is smaller than the distance difference between the ambiguous location and the base station.

In the embodiment of the present application, before the base station verifies the satellite, the base station sends the change pattern of the public TA to the satellite, which does not involve the location information of the base station, that is, the accurate location of the base station or the fuzzy location of the base station is not broadcast, which can further meet the network management requirements of the network for the location of the base station. After the base station verifies the accessed satellite, the base station can send the accurate location of the base station to the satellite, which is conducive to the satellite to determine a more accurate TA for uplink data transmission.

FIG16 is a schematic flow chart of another parameter determination method 1600 provided in an embodiment of the present application. Method 1600 describes a specific implementation of determining the TA of a satellite by using the first configuration information indicating the location of a base station, the second configuration information indicating the fuzzy location of the base station, and the round-trip delay between the fuzzy location of the base station and the base station in method 800. The location of the base station refers to the accurate location of the base station.

The method 1600 includes S1601 to S1606, and the specific steps are as follows:

S1601: The base station sends the fuzzy position of the base station and the round-trip time delay between the fuzzy position of the base station and the base station to the satellite. Correspondingly, the satellite receives the fuzzy position of the base station and the round-trip time delay between the fuzzy position of the base station and the base station.

S1602: The satellite determines a first TA of the satellite based on the ambiguous position of the base station, the position of the satellite, and the round-trip delay between the ambiguous position of the base station and the base station.

Referring to FIG. 17 , which is a schematic diagram of the fuzzy position of a base station in another IAB communication scenario, the IAB communication scenario shown in FIG. 17 includes IAB node 1, IAB node 2, and a base station, and the fuzzy position of the base station may be a position far from the base station. Taking the satellite as an example of IAB node 1, the satellite determines the round-trip delay between the satellite and the fuzzy position of the base station based on the fuzzy position of the base station and the position of the satellite, which is recorded as The round-trip delay between the fuzzy position of the base station and the base station refers to the round-trip delay between the fuzzy position of the base station and the accurate position of the base station, which is recorded as The satellite determines the first TA of the satellite based on the following formula, denoted as T _TA,1 :

Wherein, N _TA represents the TA adjustment amount, and N _TA = 0 at the initial access. _{N TA,offset} represents the TA offset, which is related to the duplex mode. Indicates the round-trip delay between the fuzzy position (reference point) of the base station and the accurate position of the base station. Represents the round-trip delay between the fuzzy position of the satellite and the base station. _Tc represents the time unit. The value of _NTA and the value of _NTA,offset can be configured by the base station.

In this step, the base station sends the round-trip delay between the fuzzy position of the base station and the accurate position of the base station to the satellite. In another implementation, the base station indicates the round-trip delay between the ambiguous position of the base station and the base station through a public TA-related parameter corresponding to the ambiguous position of the base station.

The satellite calculates the one-way delay Delay_common_false(t) between the fuzzy position of the base station and the accurate position of the base station based on the following formula:

Among them, TA _common,fasle can be determined based on the public TA corresponding to the fuzzy position of the base station, and They represent the rate of change of TA _common,fasle and the rate of change of the rate of change of TA _common,fasle , respectively, e.g. and Can be set to 0.

Furthermore, the satellite determines the round-trip delay between the fuzzy position of the base station and the accurate position of the base station according to Delay_common_false(t) For example,

S1603: The satellite accesses the base station based on the first TA.

S1604: The base station verifies the connected satellite.

S1605: After verifying the satellite, the base station sends the accurate position of the base station to the satellite. Correspondingly, the satellite receives the accurate position of the base station.

S1606: The satellite determines a second TA of the satellite based on the accurate position of the base station and the position of the satellite.

S1603 to S1606 are similar to the description of S903 to S906 above, and will not be repeated here.

The accurate location of a base station can also be understood as the location information of a base station that can provide more accurate TA than the ambiguous location information. Or it means that compared with the ambiguous location, the distance difference between the accurate location and the base station is smaller than the distance difference between the ambiguous location and the base station.

In an embodiment of the present application, the base station sends the fuzzy position of the base station to the satellite before verifying the satellite, so as to meet the network management requirements for the location of the base station. In addition, the base station can also send the round-trip delay between the fuzzy position of the base station and the base station to the satellite. The round-trip delay between the fuzzy position of the base station and the base station can make up for the delay error caused by the TA of the satellite determined according to the fuzzy position of the satellite and the position of the satellite. This is conducive to improving the accuracy of the TA of the satellite, and can expand the selection range of the fuzzy position of the base station, further meeting the network management requirements for the location of the base station. After the base station verifies the accessed satellite, the base station can send the accurate position of the base station to the satellite, which is conducive to the satellite determining a more accurate TA for uplink data transmission.

In addition to the embodiments described above, some steps in the above methods may be combined to form other possible embodiments.

For example, an embodiment obtained by combining S1601 and S1602 in method 1600 with S1205 and S1206 in method 1200 may include: the base station sends the fuzzy position of the base station and the round-trip delay between the fuzzy position of the base station and the base station to the satellite; the satellite determines the first TA of the satellite based on the fuzzy position of the base station, the position of the satellite, and the round-trip delay between the fuzzy position of the base station and the base station; the satellite accesses the base station based on the first TA; the base station verifies the accessed satellite; after the base station verifies the accessed satellite, the base station sends position difference information to the satellite, and the position difference information indicates the position difference between the accurate position of the base station and the fuzzy position of the base station; the satellite determines the second TA of the satellite based on the position difference information, the fuzzy position of the base station and the position of the satellite.

For example, an embodiment obtained by combining S1601 and S1602 in method 1600 with S1305 to S1308 in method 1300 may include: the base station sends the fuzzy position of the base station and the round-trip delay between the fuzzy position of the base station and the base station to the satellite; the satellite determines the first TA of the satellite based on the fuzzy position of the base station, the position of the satellite, and the round-trip delay between the fuzzy position of the base station and the base station; the satellite accesses the base station based on the first TA; the base station verifies the accessed satellite; after the base station verifies the accessed satellite, the base station sends the satellite's TA change rule to the satellite; the satellite determines the satellite's second TA based on the satellite's TA change rule.

It should be understood that the above embodiments are introduced by taking the satellite communication network in the NTN communication network as an example. In addition, the solution of the embodiment of the present application can also be applied to the high altitude platform system (HAPS) in the NTN communication. The steps and/or processes executed by the above satellites can be implemented by non-ground flying objects with similar or similar functions to the satellites. In addition, taking the case where the satellite's transparent transmission mode is based on the case where the gateway station/signal gateway station and the base station are together or close in position as an example, in this case, the delay of the feeder link can be approximated as the delay between the satellite and the gateway station/signal gateway station. Therefore, the steps and/or processes executed by the above base station can be implemented by the signal gateway station/gateway station, and the signal gateway station/gateway station has the function of a base station or part of the function of a base station.

It should be noted that other embodiments obtained by combining the steps in the implementation methods described above are all within the protection scope of this application.

It should be understood that the sequence numbers of the above processes do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The parameter determination method according to the embodiment of the present application is described in detail above in combination with Figures 8 to 17. The parameter determination device according to the embodiment of the present application will be described in detail below in combination with Figures 18 to 20.

FIG. 18 is a schematic block diagram of a parameter determination device 1800 provided in an embodiment of the present application. The device 1800 includes: a processing module 1810 and a receiving module 1820 .

Among them, the processing module 1810 is used to: access the base station based on the first TA of the satellite; the receiving module 1820 is used to: receive first configuration information from the base station, the first configuration information is received after the base station verifies the accessed satellite, and the first configuration information is used to indicate the location of the base station, or the first configuration information is used to indicate the TA change rule of the satellite; the processing module 1810 is also used to: determine the second TA of the satellite based on the first configuration information, and the second TA is used for the satellite to perform uplink data transmission.

Optionally, the first configuration information is used to indicate the location of the base station; and the processing module 1810 is used to determine a second TA of the satellite based on the location of the base station and the location of the satellite.

Optionally, the first configuration information is used to indicate a TA change rule of the satellite; the processing module 1810 is used to determine a second TA of the satellite based on the TA change rule of the satellite.

Optionally, the receiving module 1820 is used to: receive second configuration information from a base station. The processing module 1810 is used to: determine a first TA of the satellite based on the second configuration information.

Optionally, the second configuration information is used to indicate the ambiguous position of the base station, and the ambiguous position of the base station is determined based on the position of the base station and a preset TA accuracy range; the processing module 1810 is used to determine the first TA of the satellite based on the ambiguous position of the base station and the position of the satellite.

Optionally, the first configuration information is used to indicate the location of the base station, including: the first configuration information includes the coordinates of the location of the base station; or the first configuration information includes the difference between the coordinates of the ambiguous location of the base station and the coordinates of the location of the base station.

Optionally, the second configuration information is used to indicate a change rule of a common TA; and the processing module 1810 is used to determine a first TA of the satellite based on the change rule of the common TA.

Optionally, the second configuration information is also used to indicate the round-trip delay between the ambiguous position of the base station and the position of the base station; the processing module 1810 is used to: determine the round-trip delay between the satellite and the ambiguous position of the base station based on the ambiguous position of the base station and the position of the satellite; and determine the first TA of the satellite based on the round-trip delay between the satellite and the ambiguous position of the base station, and the round-trip delay between the ambiguous position of the base station and the position of the base station.

In an optional example, those skilled in the art can understand that the device 1800 can be specifically a satellite in the above embodiment, or the function of the satellite in the above embodiment can be integrated in the device 1800. The above functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. For example, the above receiving module 1820 can be a communication interface, such as a transceiver interface. The device 1800 can be used to execute each process and/or step corresponding to the satellite in the above method embodiment.

FIG. 19 is a schematic block diagram of another parameter determination device 1900 provided in an embodiment of the present application. The device 1900 includes: a processing module 1910 and a sending module 1920 .

Among them, the processing module 1910 is used to: verify the satellite connected to the base station; the sending module 1920 is used to: when the satellite verification is passed, send the first configuration information to the satellite, the first configuration information is used to indicate the location of the base station, or the first configuration information is used to indicate the TA change rule of the satellite.

Optionally, the processing module 1910 is used to: verify the device type of the satellite. Verifying that the satellite is passed includes: if the device type of the satellite is a network device, verifying that the satellite is passed.

Optionally, the first configuration information is used to indicate the position of the base station, including: the first configuration information includes the coordinates of the accurate position of the satellite; or the first configuration information includes the difference between the coordinates of the ambiguous position of the base station and the coordinates of the position of the base station.

Optionally, the sending module 1920 includes: sending second configuration information to the satellite, the second configuration information is used to indicate the fuzzy position of the base station, or, the second configuration information is used to indicate the changing rule of the public TA, or, the second configuration information is used to indicate the fuzzy position of the base station and the round-trip delay between the fuzzy position of the base station and the position of the base station, the fuzzy position of the base station is determined based on the position of the base station and a preset TA accuracy range.

Optionally, the first configuration information is used to indicate a TA variation rule of the satellite; the processing module 1910 is used to: obtain the ephemeris information of the satellite; and determine the TA variation rule of the satellite based on the ephemeris information of the satellite and the position of the base station.

In an optional example, those skilled in the art can understand that the device 1900 can be specifically the base station in the above embodiment, or the functions of the base station in the above embodiment can be integrated in the device 1900. The above functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. For example, the above sending module 1920 can be a communication interface, such as a transceiver interface. The device 1900 can be used to execute each process and/or step corresponding to the base station in the above method embodiment.

It should be understood that the apparatus 1800 and the apparatus 1900 herein are embodied in the form of functional modules. The term "module" herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (e.g., a shared processor, a dedicated processor, or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combined logic circuit, and/or other suitable components that support the described functions.

In the embodiments of the present application, the apparatus 1800 and the apparatus 1900 may also be a chip or a chip system, such as a system on chip (SoC). Correspondingly, the transceiver module may be a transceiver circuit of the chip, which is not limited here.

FIG20 is a schematic block diagram of another parameter determination device 2000 provided in an embodiment of the present application. The device 2000 includes a processor 2010, a transceiver 2020, and a memory 2030. The processor 2010, the transceiver 2020, and the memory 2030 communicate with each other through an internal connection path. The memory 2030 is used to store instructions. The processor 2010 is used to execute instructions stored in the memory 2030. Instructions to control the transceiver 2020 to send signals and/or receive signals.

It should be understood that the device 2000 can be specifically a satellite or a base station in the above embodiment, or the functions of the satellite or the base station in the above embodiment can be integrated in the device 2000, and the device 2000 can be used to execute the various steps and/or processes corresponding to the satellite or the base station in the above method embodiment. Optionally, the memory 2030 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type. The processor 2010 may be used to execute the instructions stored in the memory, and when the processor executes the instructions, the processor 2010 may execute the various steps and/or processes corresponding to the satellite or the base station in the above method embodiment.

It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in a processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (16)

A parameter determination method, characterized in that it is applied to a satellite, the method comprising: Accessing a base station based on a first timing advance TA of the satellite; receiving first configuration information from the base station, the first configuration information being received after the base station successfully verifies the accessed satellite, the first configuration information being used to indicate the location of the base station, or the first configuration information being used to indicate a TA change rule of the satellite; A second TA of the satellite is determined based on the first configuration information, where the second TA is used for uplink data transmission by the satellite. The method according to claim 1, characterized in that the first configuration information is used to indicate the location of the base station; The determining, based on the first configuration information, a second TA of the satellite includes: Based on the location of the base station and the location of the satellite, a second TA of the satellite is determined. The method according to claim 1, characterized in that the first configuration information is used to indicate a TA change rule of the satellite; The determining, based on the first configuration information, a second TA of the satellite includes: Based on a TA variation rule of the satellite, a second TA of the satellite is determined. The method according to any one of claims 1 to 3, characterized in that before the first TA based on the satellite accesses the base station, the method further comprises: receiving second configuration information from the base station; Based on the second configuration information, a first TA of the satellite is determined. The method according to claim 4, characterized in that the second configuration information is used to indicate the fuzzy position of the base station, and the fuzzy position of the base station is determined based on the position of the base station and a preset TA accuracy range; The determining, based on the second configuration information, a first TA of the satellite includes: A first TA of the satellite is determined based on the ambiguous position of the base station and the position of the satellite. The method according to claim 5, characterized in that the first configuration information is used to indicate the location of the base station, including: The first configuration information includes the coordinates of the location of the base station; or, The first configuration information includes a difference between the coordinates of the ambiguous position of the base station and the coordinates of the position of the base station. The method according to claim 4, characterized in that the second configuration information is used to indicate a change rule of the common TA; The determining, based on the second configuration information, a first TA of the satellite includes: Based on the variation rule of the common TA, a first TA of the satellite is determined. The method according to claim 5 or 6, characterized in that the second configuration information is also used to indicate a round-trip delay between the ambiguous position of the base station and the position of the base station; The determining, based on the ambiguous position of the base station and the position of the satellite, a first TA of the satellite comprises: Determining a round trip delay between the satellite and the ambiguous position of the base station based on the ambiguous position of the base station and the position of the satellite; A first TA of the satellite is determined based on a round trip delay between the satellite and an ambiguous position of the base station and a round trip delay between the ambiguous position of the base station and the position of the base station. A parameter determination method, characterized in that it is applied to a base station, comprising: Verifying the satellite connected to the base station; In case the satellite is verified to be successful, first configuration information is sent to the satellite, where the first configuration information is used to indicate the position of the base station, or the first configuration information is used to indicate a change rule of the timing advance TA of the satellite. The method according to claim 9, characterized in that the verifying the satellite accessing the base station comprises: Verify the equipment type of the satellite; The verification of the satellite being passed includes: If the device type of the satellite is a network device, the satellite is verified to be successful. The method according to claim 9 or 10, characterized in that the first configuration information is used to indicate the base station Location, including: The first configuration information includes the coordinates of the exact position of the satellite; or, The first configuration information includes a difference between the coordinates of the ambiguous position of the base station and the coordinates of the position of the base station. The method according to any one of claims 9 to 11, characterized in that before verifying the satellite accessing the base station, the method further comprises: Sending second configuration information to the satellite, wherein the second configuration information is used to indicate the fuzzy position of the base station, or the second configuration information is used to indicate the changing rule of the public TA, or the second configuration information is used to indicate the fuzzy position of the base station and the round-trip delay between the fuzzy position of the base station and the position of the base station, the fuzzy position of the base station is determined based on the position of the base station and a preset TA accuracy range. The method according to any one of claims 9 to 12, characterized in that the first configuration information is used to indicate a TA change rule of the satellite; Before sending the first configuration information to the satellite, the method further includes: Obtaining ephemeris information of the satellite; Based on the ephemeris information of the satellite and the position of the base station, a TA variation rule of the satellite is determined. A parameter determination device, characterized by comprising a module for implementing the method as claimed in any one of claims 1 to 8, or comprising a module for implementing the method as claimed in any one of claims 9 to 13. A parameter determination device, characterized in that it comprises a processor, the processor is coupled to a memory, the memory is used to store programs or instructions, when the program or instructions are executed by the processor, the method as described in any one of claims 1 to 8 is executed, or the method as described in any one of claims 9 to 13 is executed. A computer-readable storage medium, characterized in that it is used to store a computer program, when the computer program is run on a computer, the method as claimed in any one of claims 1 to 8 is executed, or the method as claimed in any one of claims 9 to 13 is executed.