CN114142906A

CN114142906A - Non-ground network communication method and device, terminal and network equipment

Info

Publication number: CN114142906A
Application number: CN202010925788.2A
Authority: CN
Inventors: 顾祥新
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2022-03-04

Abstract

The embodiment of the application discloses a non-ground network communication method and device, a terminal and network equipment, wherein the method comprises the following steps: the terminal acquires configuration information; and the terminal determines the offset of the window starting time according to the configuration information, wherein the offset of the window starting time is used for representing the offset of the delayed starting of the random access response window by a preset reference point. Therefore, in the embodiment of the application, the terminal obtains the configuration information and determines the offset of the delayed start of the random access response window at the preset reference point according to the configuration information, so that the terminal is favorably ensured to receive the random access response message in the random access response window after the delayed start, and the adjustment of the timing management related aspect is realized to support the non-ground network communication.

Description

Non-ground network communication method and device, terminal and network equipment

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a non-terrestrial network communication method and apparatus, a terminal, and a network device.

Background

The third Generation Partnership Project (3rd Generation Partnership Project, 3GPP) has established protocol standards for terrestrial communications, such as cellular mobile communications. In the random access procedure related to the protocol standard, after a terminal sends a random access preamble (msg 1), the terminal acquires a random access response message (msg 2) by monitoring a Physical Downlink Control Channel (PDCCH), and a msg2 window (ra-response window) is started at a specified time interval after msg1 transmission. If a valid msg2 is not received within the ra-ResponseWindow period, the terminal retransmits msg 1; if a certain number of msg1 have been sent, it will indicate to higher layers that a random access error has occurred.

Meanwhile, at present, 3GPP is making a protocol standard related to non-terrestrial network (NTN) communication, and the protocol standard mainly relates to space equipment (space-borne vehicle) or air-borne equipment (airborne vehicle), such as geostationary orbiting satellites, low-earth orbiting satellites, high-altitude platform stations (HAPS), and the like. In terrestrial communications, a terminal may receive msg2 milliseconds after transmission of the corresponding msg 1. However, since the propagation delay in NTN communications is typically larger than that of terrestrial communications, the terminal may not receive the random access response message within a specified time interval (random access response window) specified by terrestrial communications, requiring timing (timing) management related adjustments to be made to support non-terrestrial network communications.

Disclosure of Invention

The embodiment of the application provides a non-ground network communication method and device, a terminal and network equipment, so as to hopefully ensure that the terminal receives a random access response message in a random access response window after delayed start, and realize the adjustment of related aspects of timing management to support the non-ground network communication.

In a first aspect, an embodiment of the present application provides a non-terrestrial network communication method, which is applied to a terminal in a non-terrestrial network communication system; the method comprises the following steps:

acquiring configuration information;

and determining a window starting time offset according to the configuration information, wherein the window starting time offset is used for representing the offset of the delayed starting of the random access response window by a preset reference point.

In a second aspect, an embodiment of the present application provides a non-terrestrial network communication method, which is applied to a network device in a non-terrestrial network communication system; the method comprises the following steps:

and sending configuration information, wherein the configuration information is used for determining a window starting time offset, and the window starting time offset is used for representing the offset of the delayed starting of the random access response window by a preset reference point.

In a third aspect, an embodiment of the present application provides a non-terrestrial network communication apparatus, which is applied to a terminal in a non-terrestrial network communication system; the apparatus comprises a processing unit and a communication unit, the processing unit being configured to:

acquiring configuration information through the communication unit;

In a fourth aspect, an embodiment of the present application provides a non-terrestrial network communication apparatus, which is applied to a network device in a non-terrestrial network communication system; the apparatus comprises a processing unit and a communication unit, the processing unit being configured to:

sending configuration information through the communication unit, wherein the configuration information is used for determining a window starting time offset, and the window starting time offset is used for indicating an offset of delaying starting of a random access response window by a preset reference point.

In a fifth aspect, this application embodiment provides a terminal, which is a first terminal, including a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for performing the steps of any of the methods in the first aspect of this application embodiment.

In a sixth aspect, embodiments of the present application provide a network device, including a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for performing the steps of any of the methods of the second aspect of the embodiments of the present application.

In a seventh aspect, an embodiment of the present application provides a chip, including: and the processor is used for calling and running the computer program from the memory so that the device provided with the chip executes part or all of the steps described in the method of any one of the first aspect and the second aspect of the embodiment of the application.

In an eighth aspect, the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program makes a computer perform part or all of the steps described in any one of the methods of the first aspect or the second aspect of the present application.

In a ninth aspect, embodiments of the present application provide a computer program, where the computer program is operable to cause a computer to perform some or all of the steps as described in any of the methods of the first or second aspects of the embodiments of the present application. The computer program may be a software installation package.

It can be seen that, in the embodiment of the present application, the terminal obtains the configuration information, and determines the offset of the random access response window started in the delay of the preset reference point according to the configuration information, so as to be beneficial to ensuring that the terminal receives the random access response message in the random access response window after the random access response window is started in delay, and to implement the adjustment of the timing management related aspect to support the non-terrestrial network communication.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic architecture diagram of a non-terrestrial network communication system according to an embodiment of the present application;

fig. 2 is a schematic architecture diagram of a communication system with transparent satellite (transparent satellite) according to an embodiment of the present application;

fig. 3 is a schematic flow chart of non-terrestrial network communication according to an embodiment of the present disclosure;

fig. 4 is a schematic flow chart of another non-terrestrial network communication provided by the embodiment of the present application;

fig. 5 is a block diagram illustrating functional units of a non-terrestrial network communication device according to an embodiment of the present disclosure;

fig. 6 is a block diagram of functional units of another non-terrestrial network communication device according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without making any creative effort with respect to the embodiments in the present application belong to the protection scope of the present application.

The technical scheme of the embodiment of the application can be applied to a non-terrestrial network (NTN) communication system, and the NTN communication system generally provides communication service for a ground terminal in a satellite communication mode.

Illustratively, the embodiment of the present application is applied to a non-terrestrial network communication system 10, as shown in fig. 1. The non-terrestrial network communication system 10 may include a terminal 110, an intra-cell reference point (reference point)120, a satellite 130, a non-terrestrial network gateway (NTN gateway)140, and a network device 150. Wherein the terminal 110, non-terrestrial network gateway 140 and network device 150 are located on the surface of the earth and the satellite 130 is located in earth orbit. The satellite 130 may provide communication services for a geographic area of signal coverage and may communicate with terminals 110 located within the coverage area. Meanwhile, the terminal 110 is located in a cell, and the cell includes an intra-cell reference point 120. Further, the wireless communication link between the terminal 110 and the satellite 130 is referred to as a service link (service link), and the wireless communication link between the satellite 130 and the non-terrestrial network gateway (NTN gateway)140 is referred to as a supply link (feeder link). It should be noted that the non-terrestrial network gateway (NTN gateway)140 and the network device 150 may be integrated into the same device or may be separate devices.

The embodiments of the present application have been described with reference to a terminal, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and a network device. This will be described in detail below.

Specifically, the terminal in this embodiment may be a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, an intelligent terminal, a wireless communication device, a user agent, or a user equipment. The terminal may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a relay device, a vehicle-mounted device, a wearable device, a terminal in a next generation communication system such as an NR network, a terminal in a future evolved Public Land Mobile Network (PLMN), or the like, which is not particularly limited.

Further, the terminal may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a vehicle-mounted device in driving away (self driving), a wireless terminal device in remote medical treatment (remote medical), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in smart city (smart city), a wireless terminal device in smart home (smart home), or the like.

In particular, the satellite in the embodiment of the present application may be regarded as a spacecraft carrying a bent payload (bent payload) or regenerated payload (regenerated payload) signal transmitter, which generally operates at a Low Earth Orbit (LEO) at an altitude between 500 and 2000km, a Medium Earth Orbit (MEO) at an altitude between 8000 and 20000km, or a Geostationary Earth Orbit (GEO) at an altitude of 35786km, etc. That is, the satellite may be a low earth orbit satellite, a medium earth orbit satellite, a geosynchronous earth orbit satellite, or the like according to the orbital height.

In particular, the non-terrestrial network gateway in the embodiment of the present application may be regarded as an earth station or gateway located on the earth surface and capable of providing sufficient Radio Frequency (RF) power and RF sensitivity to connect to a satellite. The non-terrestrial network gateway may be a Transport Network Layer (TNL) node.

Specifically, the network device in this embodiment may be a base station (BTS) in a global system for mobile communication (GSM) communication system or a Code Division Multiple Access (CDMA) communication system, a base station (NB) in a Wideband Code Division Multiple Access (WCDMA) communication system, an evolved base station (eNB or eNodeB) in a Long Term Evolution (LTE) communication system, or a base station (gNB) in a New Radio (NR) communication system. The network device may also be an Access Point (AP) in a wireless local area network WLAN, a relay station, a network device in a PLMN network for future evolution, or a network device in an NTN communication system, etc.

It should be noted that in some network deployments, the gNB may include a Centralized Unit (CU) and a DU, and the gNB may further include an Active Antenna Unit (AAU). Wherein, the CU may implement part of the function of the gNB, and the DU may implement part of the function of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implements functions of a Radio Resource Control (RRC) layer and a Packet Data Convergence Protocol (PDCP) layer. The DU is responsible for processing a physical layer protocol and a real-time service, and implements functions of a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. In addition, the AAU implements part of the physical layer processing functions, radio frequency processing, and active antenna related functions. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling (e.g., RRC layer signaling) can be considered to be transmitted by the DU or by the DU + AAU under this architecture. It is to be understood that the network devices may comprise devices of one or more of CU nodes, DU nodes, AAU nodes. In addition, the CU may be divided into network devices in a Radio Access Network (RAN), or may be divided into network devices in a Core Network (CN), which is not specifically limited.

For example, an architectural diagram of a communication system with transparent satellite (transparent satellite) is provided in the embodiment of the present application, as shown in fig. 2. Wherein the terminal, the non-terrestrial network gateway and the gNB are located on the surface of the earth, and the satellite is located in an orbit of the earth. Meanwhile, the satellite, the non-terrestrial network gateway and the gNB can serve as a 5G radio access network (NG-RAN), and the NG-RAN is connected with a 5G core network through an NG interface. It should be noted that the satellite payload implements frequency conversion and radio frequency amplifiers in both uplink and downlink directions, and the satellite corresponds to an analog RF repeater. In addition, different transparent satellites may be connected to the same gNB on the ground.

Meanwhile, at present, 3GPP is making protocol standards related to NTN communication, and the protocol standards mainly relate to space equipment (space vehicle) or air-borne equipment (airborne vehicle), such as geostationary orbiting satellites, low earth orbit satellites, high-altitude platform stations (HAPS), and the like. In terrestrial communications, a terminal may receive msg2 milliseconds after transmission of the corresponding msg 1. However, since the propagation delay in NTN communications is typically larger than that of terrestrial communications, the terminal may not receive the random access response message within a specified time interval (random access response window) specified by terrestrial communications, requiring timing (timing) management related adjustments to be made to support non-terrestrial network communications.

In conjunction with the above description, an embodiment of the present application provides a flow chart of a non-terrestrial network communication method, please refer to fig. 3. The method is applied to a terminal in a non-terrestrial network communication system, and the non-terrestrial network communication system can comprise the terminal, a reference point in a cell, a satellite, a non-terrestrial network gateway and network equipment. The method comprises the following steps:

s310, the terminal acquires configuration information.

And S320, the terminal determines a window starting time offset according to the configuration information, wherein the window starting time offset is used for representing the offset of the delayed starting of the random access response window by a preset reference point.

It should be noted that, the terminal delays starting the random access response window according to the window starting time offset with a preset reference point.

Specifically, the random access response window includes msg2 response window ra-ResponseWindow or msgB response window msgB-ResponseWindow.

Specifically, the preset reference point may include a first symbol (symbol) of a first Physical Downlink Control Channel (PDCCH) detection opportunity after the terminal sends the random access message, or a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message.

Further, the random access message may include a random access preamble msg1 or a random access message msgA.

The present embodiment will specifically describe the configuration information.

In one possible example, the configuration information may include at least one of: the window starting time offset, the propagation delay, the offset difference and the effective time of the propagation delay.

The propagation delay may include propagation delay from a reference point in a cell to a non-ground network gateway or propagation delay from a satellite to the non-ground network gateway; the offset difference may comprise a difference between a window start time offset and a first round trip delay, or a difference between a window start time offset and a transmission delay between the reference point in the cell and the non-terrestrial network gateway, and the first round trip delay may be used to represent a round-trip time (RTT) between the reference point in the cell and the non-terrestrial network gateway.

It should be noted that the configuration information includes a window start time offset, which can be understood that the terminal may directly obtain the window start time offset, so as to delay starting the random access response window by a preset reference point according to the window start time offset, ensure that the terminal receives the random access response message in the random access response window after the delay starting, and implement adjustment of related aspects of timing management to support non-terrestrial network communication.

It should be further noted that the propagation delay from the satellite to the non-terrestrial network gateway in the embodiment of the present application may be a supply chain (feeder link) propagation delay. In addition, since the propagation delay from the non-ground network gateway to the network device can be ignored in the embodiment of the present application, the propagation delay from the reference point in the cell to the non-ground network gateway can be the propagation delay from the reference point in the cell to the network device. Similarly, the propagation delay from the satellite to the non-ground network gateway may be the propagation delay from the satellite to the network device; the round trip delay between the reference point in the cell and the non-ground network gateway may be the round trip delay between the reference point in the cell and the network device.

Specifically, the effective time of the propagation delay may be used to indicate the time period that the propagation delay in the configuration information can be used. It should be noted that, due to the fact that a position of the satellite changes during the process of rotating around the earth, a propagation delay from the satellite to the non-terrestrial network gateway or a propagation delay from the reference point in the cell to the non-terrestrial network gateway will change continuously with time, so that the effective time of the propagation delay is used to indicate the time available for the transmission delay in the configuration information in the embodiment of the present application. If the propagation delay in the configuration information acquired by the terminal exceeds the effective time of the transmission delay, it indicates that the propagation delay acquired by the terminal is not consistent with the actual propagation delay, and the terminal needs to acquire the configuration information again to acquire a new propagation delay.

Specifically, the propagation delay from the reference point in the cell to the non-ground network gateway may satisfy the following relationship:

1) the propagation delay from the reference point in the cell to the non-ground network gateway is equal to the propagation delay from the satellite to the non-ground network gateway plus the propagation delay from the reference point in the cell to the satellite;

2) and the propagation delay from the reference point in the cell to the non-ground network gateway is equal to the first round-trip delay/2.

Specifically, the first round trip delay may satisfy the following relationship:

the first round trip delay is the propagation delay from the reference point in the cell to the non-terrestrial network gateway 2.

Specifically, the propagation delay may satisfy the following relationship:

the propagation delay is the propagation delay from the reference point in the cell to the non-ground network gateway; alternatively, the first and second electrodes may be,

the propagation delay is the propagation delay from the satellite to the non-terrestrial network gateway.

Specifically, the offset difference amount may satisfy the following relationship:

offset difference is window starting time offset-first round trip delay; alternatively, the first and second electrodes may be,

offset difference is the offset of the window starting time-the propagation delay from the reference point in the cell to the non-ground network gateway.

Specifically, the configuration information may be configured by a pre-configuration or a network configuration. It should be noted that the pre-configuration may be configured by factory or the terminal moves out of the coverage of the base station to keep the configuration of the original base station, and the like, and is not limited in particular. In addition, since the non-terrestrial network gateway in the embodiment of the present application functions to transmit a signal from the network device to the satellite, and the satellite functions to relay and forward the signal, the network configuration can be regarded as being configured by system messages, signaling, and the like transmitted by the network device.

The following embodiments of the present application will specifically describe the configuration information configured by the network.

In one possible example, the terminal acquiring the configuration information may include the following operations: when a terminal initiates a random access process, receiving a system message currently sent by network equipment to acquire configuration information; or, when the terminal initiates a random access process and the propagation delay in the system message received last time by the terminal exceeds the effective time, receiving the system message currently sent by the network device to acquire the configuration information; or, when the terminal initiates a random access process and the propagation delay in the system message received last time by the terminal does not exceed the effective time, acquiring the configuration information from the system message received last time.

It should be noted that the terminal initiates a random access procedure, and it is understood that the terminal needs to transmit msg1 or msgA. It can be seen that the terminal obtains the configuration information by receiving the system message currently sent by the network device, so as to implement network configuration of the configuration information by the system message sent by the network device.

It should be further noted that, compared to the propagation delay in terrestrial communication (such as cellular mobile communication), the propagation delay in NTN communication will change with time due to the fact that the satellite has a position change during the course of rotating around the earth. For the random access procedure, in terrestrial communication, the terminal may receive msg2 within a few milliseconds after msg1 transmission, and since the propagation delay in NTN communication is usually larger than that of terrestrial communication, the terminal cannot receive msg2 within a specified time interval (e.g., ra-ResponseWindow) specified by terrestrial communication, and thus adjustments in timing management related aspects are required to support NTN communication.

To sum up, in the embodiment of the present application, when the terminal initiates the random access process each time, the terminal receives the system message currently sent by the network device to obtain the configuration information; or, when the terminal initiates a random access process each time and the propagation delay in the last received system message exceeds the effective time, receiving the system message currently sent by the network equipment to acquire the configuration information; or, when the terminal initiates the random access process each time and the propagation delay in the system message received last time does not exceed the effective time, the terminal acquires the configuration information from the system message received last time, so that the terminal determines the offset of the delayed start of the random access response window at the preset reference point according to the configuration information, the terminal is ensured to receive the random access response message in the random access response window after the delayed start, and the adjustment of the timing management related aspect is realized to support the NTN communication.

Specifically, the system message may include a System Information Block (SIB).

The following embodiment of the present application will specifically describe how the terminal determines the window start time offset according to the configuration information.

The first method is as follows:

in a possible example, if the preset reference point includes a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message or a first symbol of a first PDCCH detection opportunity after the random access opportunity where the terminal sends the random access message is located, the configuration information includes a window starting time offset; determining the window start time offset according to the configuration information may include the following operations: and acquiring the window starting time offset in the configuration information.

Examples are 1: the satellite operates in a near-earth orbit, and when a terminal initiates a random access process, the terminal receives a system message sent currently to acquire a window starting time offset of 30 time slots; finally, the terminal starts delaying msgB-ResponseWindow by 30 time slots with reference to the first symbol of the first PDCCHoccast after transmitting msgA.

For example, 2: the satellite operates in a near-earth orbit, and when a terminal initiates a random access process, the terminal receives a system message sent currently to acquire 18 time slots of window starting time offset; finally, the terminal starts the ra-ResponseWindow with a delay of 18 time slots with reference to the first symbol of the first pdcchoccaseafter the PRACH transmission of msg 1.

The second method comprises the following steps:

in a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message, the offset difference is a difference between an offset at the window starting time and a first round-trip delay, and the transmission delay is a propagation delay from a reference point in the cell to the non-ground network gateway; determining the window start time offset according to the configuration information may include the following operations: determining propagation delay and offset difference from a reference point in a cell to a non-ground network gateway according to the configuration information; and determining the offset of the window starting time according to the propagation delay and the offset difference from the reference point in the cell to the non-ground network gateway.

It can be understood that the terminal determines the propagation delay and the offset difference from the reference point in the cell to the non-ground network gateway through the configuration information, and determines the window starting time offset through the propagation delay and the offset difference from the reference point in the cell to the non-ground network gateway, so that the window starting time offset is determined according to the configuration information, the terminal is ensured to receive the random access response message in the random access response window after the delay starting, and the adjustment of the related aspects of timing management is realized to support the NTN communication.

In one possible example, determining the window start time offset according to the propagation delay from the reference point to the non-terrestrial network gateway in the cell and the offset difference may include: determining a first round-trip delay according to the propagation delay from the reference point in the cell to the non-ground network gateway; calculating a sum between the first round trip delay and the offset delta to obtain a first sum; and rounding up the first sum according to the preset time slot length to obtain the offset of the window starting time.

It should be noted that the window start time offset in this example may satisfy the following formula:

wherein, T_offsetIndicating a window start time offset, T₁Representing propagation delay, T, from reference point in cell to non-ground network gateway₁2 represents the round-trip delay between the reference point in the cell and the non-ground network gateway, Δ T represents the offset difference, T_slotWhich indicates the length of the time slot,

indicating rounding up.

Specifically, the slot length is pre-configured or network configured. For example, the slot lengths are shown in table 1.

TABLE 1

In table 1, Δ f denotes a subcarrier spacing,

indicating the number of symbols contained in each slot,

indicating the number of time slots each frame contains,

indicating the number of slots, T, contained in each sub-frame_slotIndicating the slot length.

The following exemplifies "means two".

For example, one: first, the terminal obtains the slot length T_slot1ms, and the satellite operates in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal obtains the propagation delay T from the reference point in the cell to the non-ground network gateway by receiving the currently sent system message₁12.3ms, 5ms offset delta T; then, the terminal is according to T₁And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: (12.3 x 2+5) pairs of T_slotRounding up to 30 slots (slots); finally, the terminal starts ra-ResponseWindow with a delay of 30 slots with reference to the first symbol of the first pdcchoccaseafter msg1 is transmitted.

The example is two: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates the random access process, the terminal checks the propagation delay T from the reference point in the cell to the non-ground network gateway in the system message received last time₁Is 11.6ms, and T₁The effective time is not exceeded for 10 s; thirdly, the terminal acquires T from the last received system message₁And an offset delta amount Δ T of 4 ms; then, the terminal is according to T₁And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: (11.6 x 2+4) pairs of T_slotWhen the whole number is 55Slots (slots); finally, the terminal starts ra-ResponseWindow with a delay of 55 slots with reference to the first symbol of the first pdcchoccaseafter msg1 is transmitted.

For example, three: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates the random access process, the terminal checks the propagation delay T from the reference point in the cell to the non-ground network gateway in the system message received last time₁Is 11.6ms, and T₁Exceeding the effective time by 10 s; thirdly, the terminal acquires a new T by receiving the currently sent system message₁11.3ms and an offset delta Δ T of 4 ms; then, the terminal is according to T₁And determining the window starting time offset as follows by delta T: (11.3 x 2+4) pairs of T_slotRound up 54 slots (slots); finally, the terminal starts ra-ResponseWindow with a delay of 54 slots with reference to the first symbol of the first pdcchoccaseafter msg1 is transmitted.

The third method comprises the following steps:

in a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message, the offset difference is a difference between an offset at the window starting time and a first round-trip delay, and the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway; determining the window start time offset according to the configuration information may include the following operations: determining propagation delay and offset difference from the satellite to the non-ground network gateway according to the configuration information; determining propagation delay from a reference point to a satellite in a cell according to preset satellite ephemeris information; and determining the offset of the window starting time according to the propagation delay from the satellite to the non-ground network gateway, the offset difference and the propagation delay from the reference point in the cell to the satellite.

It can be understood that the terminal determines the propagation delay from the reference point in the cell to the satellite through the preset satellite ephemeris information, and then determines the offset of the window starting time through the propagation delay from the satellite to the non-ground network gateway, the offset difference and the propagation delay from the reference point in the cell to the satellite, thereby determining the offset of the window starting time according to the configuration information, ensuring that the terminal receives the random access response message in the random access response window after the delay starting, and realizing the adjustment of the timing management related aspect to support the NTN communication.

In particular, satellite ephemeris (satellite ephemeris) information is a set of data that describes the orbit of a satellite. It should be noted that, because the reference point in the cell can be regarded as a fixed point in the cell, the terminal can determine the current position information of the satellite according to the preset satellite ephemeris information, and then determine the propagation delay from the reference point in the cell to the satellite according to the distance from the position information of the fixed point to the current position information of the satellite, the propagation speed of the electromagnetic wave in vacuum or air, and the like.

In one possible example, determining the window start time offset according to the propagation delay from the satellite to the non-terrestrial network gateway, the offset difference amount, and the propagation delay from the reference point in the cell to the satellite includes: determining a first round-trip delay according to the propagation delay from the satellite to the non-ground network gateway and the propagation delay from the reference point in the cell to the satellite; calculating a sum between the first round trip delay and the offset delta to obtain a second sum; and rounding up the second sum according to the preset time slot length to obtain the offset of the window starting time.

It should be noted that the window start time offset in this example satisfies the following formula:

wherein, T_offsetIndicating a window start time offset, T₂Representing propagation delay, T, from satellite to non-terrestrial network gateway₃Represents the propagation delay from the reference point to the satellite in the cell (T)₂+T₃) 2 represents the round-trip delay between the reference point in the cell and the non-ground network gateway, Δ T represents the offset difference, T_slotWhich indicates the length of the time slot,

indicating upward fetchAnd (6) finishing.

The following exemplifies "means three".

For example, one: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal obtains the propagation delay T from the satellite to the non-ground network gateway by receiving the system information₂6.1ms, and the offset delta Delta T is 4 ms; thirdly, the terminal determines the propagation delay T from the reference point to the satellite in the cell according to the preset satellite ephemeris information₃5.5 ms; then, the terminal is according to T₂、T₃And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: [(6.1+5.5)*2+4]For T_slotRound up to 55 slots (slots); finally, the terminal starts ra-ResponseWindow with a delay of 55 slots with reference to the first symbol of the first pdcchoccaseafter msg1 is transmitted.

The example is two: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal checks the propagation delay T from the satellite to the non-ground network gateway in the system message received last time₂Is 6.1ms, and T₂The effective time is not exceeded for 10 s; thirdly, the terminal acquires T from the last received system message₂And an offset delta amount Δ T of 4 ms; in addition, the terminal determines the propagation delay T from the reference point in the cell to the satellite according to the preset satellite ephemeris information₃5.5 ms; then, the terminal is according to T₂、T₃And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: [(6.1+5.5)*2+4]For T_slotRound up to 55 slots (slots); finally, the terminal starts ra-ResponseWindow with a delay of 55 slots with reference to the first symbol of the first pdcchoccaseafter msg1 is transmitted.

For example, three: first, the terminal obtains the slot length T_slotIs 0.5ms, and the satellite operates in a low earth orbit(ii) a Secondly, when the terminal initiates a random access process, the terminal checks the propagation delay T from the satellite to the non-ground network gateway in the system message received last time₂Is 6.1ms, and T₂Exceeding the effective time by 10 s; thirdly, the terminal acquires a new T by receiving the currently sent system message₂5.8ms and an offset delta Δ T of 4 ms; in addition, the terminal determines the propagation delay T from the reference point in the cell to the satellite according to the preset satellite ephemeris information₃5.5 ms; then, the terminal is according to T₂、T₃And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: [(5.8+5.5)*2+4]For T_slotRound up 54 slots (slots); finally, the terminal starts ra-ResponseWindow with a delay of 54 slots with reference to the first symbol of the first pdcchoccaseafter msg1 is transmitted.

The method is as follows:

in a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after the random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset at the window starting time and a transmission delay from a reference point in the cell to the non-ground network gateway, and the propagation delay is a propagation delay from the reference point in the cell to the non-ground network gateway; determining the window start time offset according to the configuration information may include the following operations: determining propagation delay and offset difference from a reference point in a cell to a non-ground network gateway according to the configuration information; calculating a sum value between propagation delay and offset difference from a reference point to a non-ground network gateway in a cell to obtain a third sum value; and rounding up the third sum according to the preset time slot length to obtain the offset of the window starting time.

wherein, T_offsetIndicating a window start time offset, T₁Is small in representationPropagation delay from the reference point in the area to the non-ground network gateway, wherein delta T' represents offset difference, T_slotWhich indicates the length of the time slot,

indicating rounding up.

The following exemplifies "means four".

For example, one: first, the terminal obtains the slot length T_slot1ms, and the satellite operates in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal obtains the propagation delay T from the reference point in the cell to the non-ground network gateway by receiving the currently sent system message₁12.3ms, 5ms offset delta T; then, the terminal is according to T₁And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: (12.3+5) pairs of T_slotRounding up to 18 slots; finally, the terminal starts the ra-ResponseWindow with a delay of 18 time slots with reference to the first symbol of the first pdcchoccaseafter the PRACH transmission of msg 1.

The example is two: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates the random access process, the terminal checks the propagation delay T from the reference point in the cell to the non-ground network gateway in the system message received last time₁Is 11.6ms, and T₁The effective time is not exceeded for 10 s; thirdly, the terminal acquires T from the last received system message₁And an offset delta amount Δ T of 4 ms; then, the terminal is according to T₁And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: (11.6+4) pairs of T_slotRounding up to 32 slots (slots); finally, the terminal starts the ra-ResponseWindow with a delay of 32 time slots by taking the first symbol of the first pdcchoccaseafter the PRACH event where msg1 is sent as a reference point.

For example, three: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates the random access process, the terminal checks the last received random accessPropagation delay T from reference point in cell to non-ground network gateway in system message₁Is 11.6ms, and T₁Exceeding the effective time by 10 s; thirdly, the terminal acquires a new T by receiving the currently sent system message₁11.3ms and an offset delta Δ T of 4 ms; then, the terminal is according to T₁And determining the window starting time offset as follows by delta T: (11.3+4) pairs of T_slotRound up to 31 slots (slots); finally, the terminal starts the ra-ResponseWindow with 31 time slots delayed by the first symbol of the first pdcchoccaseafter the PRACH transmission of msg 1.

The fifth mode is as follows:

in a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after a random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset at the window starting time and a transmission delay from a reference point in the cell to the non-ground network gateway, and the transmission delay is a transmission delay from the satellite to the non-ground network gateway; determining the window start time offset according to the configuration information may include the following operations: determining propagation delay and offset difference from the satellite to the non-ground network gateway according to the configuration information; determining propagation delay from a reference point to a satellite in a cell according to preset satellite ephemeris information; calculating the sum of the propagation delay from the satellite to the non-ground network gateway, the propagation delay from the reference point in the cell to the satellite and the offset difference to obtain a fourth sum; and rounding up the fourth sum according to the preset time slot length to obtain the offset of the window starting time.

wherein, T_offsetIndicating a window start time offset, T₂Representing propagation delay, T, from satellite to non-terrestrial network gateway₃Δ T table representing propagation delay from reference point to satellite in cellIndicating the offset difference, T_slotWhich indicates the length of the time slot,

indicating rounding up.

The following illustrates "means five".

For example, one: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal obtains the propagation delay T from the satellite to the non-ground network gateway by receiving the system information₂6.1ms, and the offset delta Delta T is 4 ms; thirdly, the terminal determines the propagation delay T from the reference point to the satellite in the cell according to the preset satellite ephemeris information₃5.5 ms; then, the terminal is according to T₂、T₃And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: (6.1+5.5+4) vs. T_slotRounding up to 32 slots (slots); finally, the terminal starts the ra-ResponseWindow with a delay of 32 time slots by taking the first symbol of the first pdcchoccaseafter the PRACH event where msg1 is sent as a reference point.

The example is two: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal checks the propagation delay T from the satellite to the non-ground network gateway in the system message received last time₂Is 6.1ms, and T₂The effective time is not exceeded for 10 s; thirdly, the terminal acquires T from the last received system message₂And an offset delta amount Δ T of 4 ms; in addition, the terminal determines the propagation delay T from the reference point in the cell to the satellite according to the preset satellite ephemeris information₃5.5 ms; then, the terminal is according to T₂、T₃And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: (6.1+5.5+4) vs. T_slotRounding up to 32 slots (slots); finally, the terminal starts the ra-ResponseWindow with a delay of 32 time slots by taking the first symbol of the first pdcchoccaseafter the PRACH event where msg1 is sent as a reference point.

Examples of suchAnd 3, bright three: first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal checks the propagation delay T from the satellite to the non-ground network gateway in the system message received last time₂Is 6.1ms, and T₂Exceeding the effective time by 10 s; thirdly, the terminal acquires a new T by receiving the currently sent system message₂5.8ms and an offset delta Δ T of 4 ms; in addition, the terminal determines the propagation delay T from the reference point in the cell to the satellite according to the preset satellite ephemeris information₃5.5 ms; then, the terminal is according to T₂、T₃And determining the window start time offset T by the sum Delta T_offsetComprises the following steps: (5.8+5.5+4) vs. T_slotRound up to 31 slots (slots); finally, the terminal starts the ra-ResponseWindow with 31 time slots delayed by the first symbol of the first pdcchoccasein after the PRACH occupancy where msg1 is sent as a reference point.

In combination with the above description, the technical solution in this embodiment of the present application further includes how the terminal determines the amount of the advance transmission backoff for the random access message according to the configuration information, which is described as an example below.

In one possible example, the method further comprises the operations of: and the terminal determines the advance sending compensation amount aiming at the random access message according to the configuration information.

The amount of the backoff for the early transmission may be used to indicate an amount of the backoff for the early transmission of the random access message.

Specifically, the terminal starts to send the random access message according to the amount of the advance sending compensation by using a random access opportunity (PRACH) as a reference point.

It should be noted that, compared to the propagation delay in terrestrial communication, the propagation delay in NTN communication may change over time due to the fact that the satellite has a position change during the process of rotating around the earth. For the random access process, in the ground communication, when the terminal sends msg1, the network device can receive msg1 in a preamble receiving window (preamble receiving window) corresponding to PRACH acquisition, and since the propagation delay in NTN communication is usually greater than that of ground communication, the network device may not receive msg1 in the preamble receiving window corresponding to PRACH acquisition, and thus, adjustment in the timing management related aspect is required to support NTN communication.

To sum up, in the embodiment of the present application, when the terminal initiates the random access process each time, the terminal receives the system message currently sent by the network device to obtain the configuration information; or, when the terminal initiates a random access process each time and the propagation delay in the last received system message exceeds the effective time, receiving the system message currently sent by the network equipment to acquire the configuration information; or, when the terminal initiates the random access process each time and the propagation delay in the system message received last time does not exceed the effective time, the configuration information is acquired from the system message received last time, so that the terminal determines the compensation amount required to be sent in advance by the random access message according to the configuration information, the network equipment can be ensured to receive the random access message in the message receiving window corresponding to the PRACH occasion after the terminal sends the random access message in advance, and the adjustment of the related aspects of timing management is realized to support the NTN communication.

Specifically, the configuration information may further include: the first indication information can be used for indicating that the early sending compensation amount is a first round-trip delay or a second round-trip delay, and the second round-trip delay is used for representing the round-trip delay between the terminal and the non-terrestrial network gateway.

It can be understood that, the terminal obtains the first indication information in the configuration information to obtain whether the compensation amount sent in advance is the first round-trip delay or the second round-trip delay, so that the terminal determines the compensation amount required to be sent in advance for the random access message according to the configuration information, the network device can receive the random access message in a message receiving window corresponding to the PRACH occasion after the terminal sends the random access message in advance, and the adjustment of the timing management related aspect is realized to support the NTN communication.

Further, the second round trip delay may be determined by a transmission delay from the reference point to the non-terrestrial network gateway in the cell and a terminal-specific (specific) transmission delay; the dedicated transmission delay of the terminal may be used to indicate a difference between a transmission delay from the terminal to the satellite and a transmission delay from a reference point in the cell to the satellite.

It should be noted that the second round trip delay may satisfy the following relationship:

a second round-trip delay (round-trip delay between the terminal and the non-ground network gateway) (transmission delay from the reference point in the cell to the non-ground network gateway + terminal-specific transmission delay) is 2;

the exclusive transmission delay of the terminal can satisfy the following relation:

the terminal-specific transmission delay is the transmission delay from the terminal to the satellite, i.e., the transmission delay from the reference point in the cell to the satellite.

The first method is as follows:

in one possible example, if the propagation delay is the propagation delay from a reference point in a cell to a non-ground network gateway, the first indication information is used to indicate that the early sending compensation amount is a first round-trip delay; the terminal determines an amount of the advance transmission backoff for the random access message according to the configuration information, which may include the following operations: determining propagation delay and first indication information from a reference point in a cell to a non-ground network gateway according to the configuration information; and determining the amount of the compensation to be sent in advance according to the propagation delay from the reference point in the cell to the non-ground network gateway.

It should be noted that the amount of advance transmission compensation in this example satisfies the following formula:

T_comp＝T₁*2，

wherein, T_compIndicating an amount of advance transmission compensation, T₁Representing propagation delay, T, from reference point in cell to non-ground network gateway₁And 2 represents the round-trip delay between the reference point in the cell and the non-ground network gateway.

Therefore, the terminal determines the propagation delay from the reference point in the cell to the non-ground network gateway and the first indication information through the configuration information, and determines the amount of the early sending compensation according to the propagation delay from the reference point in the cell to the non-ground network gateway, so that the network equipment can receive the random access message in a message receiving window corresponding to the PRACH after the terminal sends the random access message in advance, and the adjustment of the timing management related aspect is realized to support the NTN communication.

The following illustrates "means one".

For example, one: the satellite runs in a near-earth orbit, and when the terminal initiates a random access process, the terminal obtains the propagation delay T from the reference point in the cell to the non-ground network gateway by receiving the currently sent system message₁12.3ms and first indication information, wherein the first indication information indicates that the advance sending compensation amount is a first round-trip delay; finally, the terminal is according to T₁Determining the amount of the early sending compensation as follows: 12.3 × 2 ═ 24.6 ms. It should be noted that the terminal may send msg1 or msgA 24.6ms ahead of the PRACH occasion start.

The example is two: the satellite runs in the near-earth orbit, when the terminal initiates the random access process, the terminal checks the propagation delay T from the reference point in the cell to the non-ground network gateway in the system information received last time₁Is 11.6ms, and T₁The effective time is not exceeded for 10 s; then, the terminal acquires T from the last received system message₁And first indication information, and the first indication information indicates that the compensation amount is sent in advance as a first round-trip delay; finally, the terminal is according to T₁Determining the amount of the early sending compensation as follows: 11.6 × 2 ═ 23.2 ms.

For example, three: the satellite runs in the near-earth orbit, when the terminal initiates the random access process, the terminal checks the propagation delay T from the reference point in the cell to the non-ground network gateway in the system information received last time₁Is 11.6ms, and T₁Exceeding the effective time by 10 s; then, the terminal acquires a new T by receiving the currently sent system message₁11.3ms and first indication information indicating that the amount of the early transmission compensation is firstBack time delay; finally, the terminal is according to T₁Determining the amount of the early sending compensation as follows: 11.3 × 2 ═ 22.6 (slots).

The second method comprises the following steps:

in a possible example, if the propagation delay is the propagation delay from a reference point in a cell to a non-ground network gateway, the first indication information is used to indicate that the early sending compensation amount is a second round-trip delay; determining an amount of advance transmission backoff for the random access message according to the configuration information may include the following operations: determining propagation delay and first indication information from a reference point in a cell to a non-ground network gateway according to the configuration information; determining the exclusive transmission time delay of the terminal according to preset satellite ephemeris information and the current position information of the terminal; and determining the compensation amount sent in advance according to the propagation delay from the reference point in the cell to the non-ground network gateway and the special transmission delay of the terminal.

T_comp＝(T₁+T₄)*2，

wherein, T_compIndicating an amount of advance transmission compensation, T₁Representing propagation delay, T, from reference point in cell to non-ground network gateway₄Indicating terminal-specific transmission delay, (T)₁+T₄) And 2 represents the round-trip delay between the terminal and the non-ground network gateway.

In particular, satellite ephemeris (satellite ephemeris) information is a set of data that describes the orbit of a satellite. It should be noted that the terminal may determine the current position information of the satellite through preset satellite ephemeris information; then, the terminal determines the propagation delay from the terminal to the satellite according to the distance from the current position information of the terminal to the current position information of the satellite, the propagation speed of the electromagnetic wave in vacuum or air and the like, and determines the propagation delay from the reference point in the cell to the satellite according to the distance from the position information of the reference point in the cell to the current position information of the satellite, the propagation speed of the electromagnetic wave in vacuum or air and the like; and finally, the terminal determines the special transmission time delay of the terminal through the propagation time delay from the terminal to the satellite and the propagation time delay from the reference point in the cell to the satellite.

It can be seen that the terminal determines the amount of the pre-transmission compensation through the propagation delay from the reference point to the non-ground network gateway in the cell and the dedicated transmission delay of the terminal, so as to ensure that the network device can receive the random access message in the message receiving window corresponding to the PRACH occasion after the terminal sends the random access message in advance, and realize the adjustment of the timing management related aspect to support the NTN communication.

The following exemplifies "means two".

For example, one: the satellite runs in a near-earth orbit, and when the terminal initiates a random access process, the terminal obtains the propagation delay T from the reference point in the cell to the non-ground network gateway by receiving the currently sent system message₁11.6ms and first indication information, wherein the first indication information indicates that the advance sending compensation amount is a second round-trip delay; then, the terminal determines the exclusive transmission time delay T of the terminal according to the preset satellite signaling information and the current position information of the terminal₄0.7 ms; finally, the terminal is according to T₁And T₄Determining the amount of the early sending compensation as follows: (11.6+0.7) × 2 ═ 24.6 ms.

The example is two: the satellite runs in the near-earth orbit, when the terminal initiates the random access process, the terminal checks the propagation delay T from the reference point in the cell to the non-ground network gateway in the system information received last time₁Is 11.6ms, and T₁The effective time is not exceeded for 10 s; secondly, the terminal acquires T from the last received system message₁And first indication information, and the first indication information indicates that the compensation amount is sent in advance as a second round-trip delay; then, the terminal determines the exclusive transmission time delay T of the terminal according to the preset satellite signaling information and the current position information of the terminal₄0.7 ms; finally, the terminal is according to T₁And T₄Determining the amount of the early sending compensation as follows: (11.6+0.7) × 2 ═ 24.6 ms.

For example, three: the satellite runs in the near-earth orbit, when the terminal initiates the random access process, the terminal checks the transmission from the reference point in the cell to the non-ground network gateway in the system message received last timeTime delay of broadcasting T₁Is 11.6ms, and T₁Exceeding the effective time by 10 s; secondly, the terminal acquires a new T by receiving the currently sent system message₁11.3ms and first indication information, wherein the first indication information indicates that the advance sending compensation amount is a second round-trip delay; then, the terminal determines the exclusive transmission time delay T of the terminal according to the preset satellite signaling information and the current position information of the terminal₄0.9 ms; finally, the terminal is according to T₁Determining the amount of the early sending compensation as follows: (11.3+0.9) × 2 ═ 24.4 ms.

The third method comprises the following steps:

in one possible example, if the propagation delay is the propagation delay from the satellite to the non-terrestrial network gateway, the first indication information is used to indicate that the sending advance compensation amount is the first round-trip delay; determining an amount of advance transmission backoff for the random access message according to the configuration information may include the following operations: determining the propagation delay from the satellite to the non-ground network gateway and first indication information according to the configuration information; determining propagation delay from a reference point to a satellite in a cell according to preset satellite ephemeris information; and determining the early sending compensation amount according to the propagation delay from the satellite to the non-ground network gateway and the propagation delay from the reference point in the cell to the satellite.

It should be noted that the transmission compensation amount in this example satisfies the following formula:

T_comp＝(T₂+T₃)*2，

wherein, T_compIndicating an amount of advance transmission compensation, T₂Representing propagation delay, T, from satellite to non-terrestrial network gateway₃Represents the propagation delay from the reference point to the satellite in the cell (T)₂+T₃) And 2 represents the round-trip delay between the reference point in the cell and the non-ground network gateway.

Therefore, the terminal determines the early sending compensation amount through the propagation delay from the satellite to the non-ground network gateway and the propagation delay from the reference point in the cell to the satellite, so that the network device can receive the random access message in a message receiving window corresponding to the PRACH after the terminal sends the random access message in advance, and the adjustment of the timing management related aspect is realized to support the NTN communication.

The description of the "means three" can be found in combination with the above descriptions, and is not repeated here.

The method is as follows:

in one possible example, if the propagation delay is the propagation delay from the satellite to the non-terrestrial network gateway, the first indication information is used to indicate that the sending advance compensation amount is the second round-trip delay; determining an amount of advance transmission backoff for the random access message according to the configuration information may include the following operations: determining the propagation delay from the satellite to the non-ground network gateway and first indication information according to the configuration information; determining propagation delay from a reference point to a satellite in a cell and special transmission delay of a terminal according to preset satellite ephemeris information and current position information of the terminal; and determining the advance sending compensation amount according to the propagation delay from the satellite to the non-ground network gateway, the propagation delay from the reference point in the cell to the satellite and the special transmission delay of the terminal.

T_comp＝(T₂+T₃+T₄)*2，

wherein, T_compIndicating an amount of advance transmission compensation, T₂Representing propagation delay, T, from satellite to non-terrestrial network gateway₃Representing propagation delay, T, from reference point to satellite in a cell₄Indicating terminal-specific transmission delay, (T)₂+T₃+T₄) And 2 represents the round-trip delay between the terminal and the non-ground network gateway.

Therefore, the terminal determines the amount of the pre-sending compensation through the propagation delay from the satellite to the non-ground network gateway, the propagation delay from the reference point in the cell to the satellite and the special transmission delay of the terminal, so that the network device can receive the random access message in a message receiving window corresponding to the PRACH after the terminal sends the random access message in advance, and the adjustment of the timing management related aspect is realized to support the NTN communication.

The description of the "means four" can be found in combination with the above descriptions, and is not described in detail here.

With reference to the above description, it should be noted that, in the embodiment of the present application, the terminal may determine the advance transmission compensation amount and the window start time offset according to the configuration information. An example of the technical solution is given below, and those skilled in the art may combine the example with the above examples to obtain other similar technical solutions, which are not described in detail herein.

For example, first, the terminal obtains the slot length T_slot0.5ms, and the satellite is operating in a low earth orbit; secondly, when the terminal initiates a random access process, the terminal checks the propagation delay T from the satellite to the non-ground network gateway in the system message received last time₂Is 6.1ms, and T₂Exceeding the effective time by 10 s; thirdly, the terminal acquires a new T by receiving the currently sent system message₂5.8ms, offset difference Delta T is 4ms and first indication information, and the first indication information indicates that the early sending compensation amount is a second round-trip delay; then, the terminal determines the propagation delay T from the reference point in the cell to the satellite according to the preset satellite signaling information and the current position information of the terminal₃Is 5.5ms and terminal-specific transmission delay T₄0.9 ms; finally, the terminal is according to T₂、T₃And T₄Determining the amount of the early sending compensation as follows: (5.8+5.5+0.9) × 2 ═ 24.4ms, according to T₂、T₃And determining the window starting time offset as follows by delta T: (5.8+5.5+4) vs. T_slotRound up to 31 slots (slots). It should be noted that the terminal may send msg1 24.6ms ahead of the PRACH occase start, and start ra-ResponseWindow 31 slots later after sending msg1 with the first symbol of the first pdcchoccase after the PRACH occase where msg1 is sent as a reference point.

Consistent with the above embodiments, the present application provides a flowchart of another non-terrestrial network communication method, please refer to fig. 4. The method is applied to the network equipment in the non-ground network communication system, and the non-ground network communication system can comprise the network equipment, the reference point in the cell, the satellite, the non-ground network gateway and the terminal. The method comprises the following steps:

s410, the network device sends configuration information, where the configuration information is used to determine a window starting time offset, and the window starting time offset is used to indicate an offset at which the random access response window is started in a delayed manner with a preset reference point.

It can be seen that, in the embodiment of the present application, the network device sends the configuration information, and the configuration information is used to determine the offset of the random access response window starting with the preset reference point delay, so as to facilitate the adjustment of the timing management related aspect to support the non-terrestrial network communication.

In one possible example, the network device sending the configuration information may include the following operations: the network device sends the configuration information through a system message.

In one possible example, the preset reference point may include a first symbol of a first PDCCH detection opportunity after the terminal transmits the random access message or a first symbol of a first PDCCH detection opportunity after the random access opportunity where the terminal transmits the random access message in the non-terrestrial network communication system.

In one possible example, the random access message may include a random access preamble msg1 or a random access message msgA.

In one possible example, a non-terrestrial network communication system may include a network device, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and a terminal; the configuration information may include at least one of: the window starting time offset, the propagation delay, the offset difference and the effective time of the propagation delay; the propagation delay comprises the propagation delay from a reference point in a cell to a non-ground network gateway or the propagation delay from a satellite to the non-ground network gateway; the offset difference may comprise a difference between the response window start time offset and a first round trip delay, or a difference between the window start time offset and a transmission delay between the reference point in the cell and the non-terrestrial network gateway, and the first round trip delay may be used to represent a round trip delay between the reference point in the cell and the non-terrestrial network gateway.

In one possible example, the configuration information may also be used to determine an amount of advance transmission backoff for the random access message.

In one possible example, the configuration information may further include: the first indication information is used for indicating that the early sending compensation amount is a first round-trip delay or a second round-trip delay, and the second round-trip delay is used for representing the round-trip delay between the terminal and the non-terrestrial network gateway.

In one possible example, the random access response window may include the msg2 response window ra-ResponseWindow or the msgB response window msgB-ResponseWindow.

The technical solutions according to the present embodiment are the same as those according to the above-described embodiments. For those skilled in the art, the detailed implementation of the technical solution related to the present embodiment can be obtained through the relevant description in the foregoing embodiments, and details are not described here again.

The above-mentioned scheme of the embodiment of the present application is introduced mainly from the perspective of interaction between network elements in the method side. It is understood that the terminal includes corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-described functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the terminal may be divided into the functional units according to the above method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit may be implemented in the form of hardware, or may be implemented in the form of a software program module. It should be noted that the division of the units in the embodiment of the present application is illustrative, and is only one division of the logic functions, and there may be another division in actual implementation.

In the case of an integrated unit, fig. 5 provides a block diagram of the functional units of a non-terrestrial network communication device. The non-terrestrial network communication apparatus 500 is applied to a terminal in a non-terrestrial network communication system, and specifically includes: a processing unit 502 and a communication unit 503. The processing unit 502 is configured to control and manage actions of the terminal, for example, the processing unit 502 is configured to support the terminal to execute the steps in fig. 3 and other processes for the technical solutions described in this application. The communication unit 503 is used to support communication between the terminal and other devices in the non-terrestrial network communication system. The non-terrestrial network communication device 500 may further include a storage unit 501 for storing program codes and data of the terminal.

The processing unit 502 may be a processor or a controller, and may be, for example, a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processing unit 502 may also be a combination that performs computing functions, e.g., comprising one or more microprocessors, a combination of DSPs and microprocessors, or the like. The communication unit 503 may be a communication interface, a transceiver, a transceiving circuit, etc., and the storage unit 501 may be a memory. When the processing unit 502 is a processor, the communication unit 503 is a communication interface, and the storage unit 501 is a memory, the non-terrestrial network communication device 500 according to the embodiment of the present application may be a terminal as shown in fig. 7.

In a specific implementation, the processing unit 502 is configured to perform any step performed by the terminal in the above method embodiment, and when performing data transmission such as sending, the communication unit 503 is optionally invoked to complete the corresponding operation. The details will be described below.

The processing unit 502 is configured to: acquiring configuration information; and determining a window starting time offset according to the configuration information, wherein the window starting time offset is used for representing the offset of the delayed starting of the random access response window by a preset reference point.

In one possible example, in terms of obtaining configuration information, the processing unit 502 is specifically configured to: when a terminal initiates a random access process, receiving a system message currently sent by network equipment to acquire configuration information; or, when the terminal initiates a random access process and the propagation delay in the system message received last time by the terminal exceeds the effective time, receiving the system message currently sent by the network device to acquire the configuration information; or, when the terminal initiates a random access process and the propagation delay in the system message received last time by the terminal does not exceed the effective time, acquiring the configuration information from the system message received last time.

In one possible example, the preset reference point includes a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message or a first symbol of a first PDCCH detection opportunity after the random access opportunity where the terminal sends the random access message.

In one possible example, the random access message comprises a random access preamble msg1 or a random access message msgA.

In one possible example, a non-terrestrial network communication system includes a terminal, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and a network device; the configuration information includes at least one of: the window starting time offset, the propagation delay, the offset difference and the effective time of the propagation delay; the propagation delay comprises the propagation delay from a reference point in a cell to a non-ground network gateway or the propagation delay from a satellite to the non-ground network gateway; the offset difference comprises a difference between a window starting time offset and a first round-trip delay or a difference between the window starting time offset and a transmission delay from a reference point in a cell to a non-ground network gateway, wherein the first round-trip delay is used for representing the round-trip delay between the reference point in the cell and the non-ground network gateway.

In a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message, the offset difference is a difference between an offset at the window starting time and a first round-trip delay, and the propagation delay is a propagation delay from a reference point in the cell to the non-ground network gateway; then, in terms of determining the window start time offset according to the configuration information, the processing unit 502 is specifically configured to: determining propagation delay and offset difference from a reference point in a cell to a non-ground network gateway according to the configuration information; and determining the offset of the window starting time according to the propagation delay and the offset difference from the reference point in the cell to the non-ground network gateway.

In one possible example, in terms of determining the offset of the window starting time according to the propagation delay from the reference point in the cell to the non-terrestrial network gateway and the offset difference, the processing unit 502 is specifically configured to: determining a first round-trip delay according to the propagation delay from the reference point in the cell to the non-ground network gateway; calculating a sum between the first round trip delay and the offset delta to obtain a first sum; and rounding up the first sum according to the preset time slot length to obtain the offset of the window starting time.

In a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message, the offset difference is a difference between an offset at the window starting time and a first round-trip delay, and the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway; then, in terms of determining the window start time offset according to the configuration information, the processing unit 502 is specifically configured to: determining propagation delay and offset difference from the satellite to the non-ground network gateway according to the configuration information; determining propagation delay from a reference point to a satellite in a cell according to preset satellite ephemeris information; and determining the offset of the window starting time according to the propagation delay from the satellite to the non-ground network gateway, the offset difference and the propagation delay from the reference point in the cell to the satellite.

In one possible example, in terms of determining the window start time offset according to the propagation delay from the satellite to the non-terrestrial network gateway, the offset difference amount, and the propagation delay from the reference point in the cell to the satellite, the processing unit 502 is specifically configured to: determining a first round-trip delay according to the propagation delay from the satellite to the non-ground network gateway and the propagation delay from the reference point in the cell to the satellite; calculating a sum between the first round trip delay and the offset delta to obtain a second sum; and rounding up the second sum according to the preset time slot length to obtain the offset of the window starting time.

In a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after the random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset at the window starting time and a transmission delay from a reference point in the cell to the non-ground network gateway, and the propagation delay is a propagation delay from the reference point in the cell to the non-ground network gateway; then, in terms of determining the window start time offset according to the configuration information, the processing unit 502 is specifically configured to: determining propagation delay and offset difference from a reference point in a cell to a non-ground network gateway according to the configuration information; calculating a sum value between propagation delay and offset difference from a reference point to a non-ground network gateway in a cell to obtain a third sum value; and rounding up the third sum according to the preset time slot length to obtain the offset of the window starting time.

In a possible example, if the preset reference point is a first symbol of a first PDCCH detection opportunity after a random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset at the window starting time and a transmission delay from a reference point in the cell to the non-ground network gateway, and the transmission delay is a transmission delay from the satellite to the non-ground network gateway; then, in terms of determining the window start time offset according to the configuration information, the processing unit 502 is specifically configured to: determining propagation delay and offset difference from the satellite to the non-ground network gateway according to the configuration information; determining propagation delay from a reference point to a satellite in a cell according to preset satellite ephemeris information; calculating the sum of the propagation delay from the satellite to the non-ground network gateway, the propagation delay from the reference point in the cell to the satellite and the offset difference to obtain a fourth sum; and rounding up the fourth sum according to the preset time slot length to obtain the offset of the window starting time.

In one possible example, the processing unit 502 is further configured to: and determining the advance sending compensation amount aiming at the random access message according to the configuration information.

In one possible example, the configuration information further includes: the first indication information is used for indicating that the early sending compensation quantity is a first round-trip delay or a second round-trip delay, and the second round-trip delay is used for representing the round-trip delay between the terminal and the non-ground network gateway.

In one possible example, the second round trip delay is determined by a transmission delay from the reference point to the non-terrestrial network gateway within the cell and a terminal-specific transmission delay; the terminal-specific transmission delay is used for representing a difference value between the transmission delay from the terminal to the satellite and the transmission delay from the reference point in the cell to the satellite.

In one possible example, if the propagation delay is the propagation delay from a reference point in a cell to a non-ground network gateway, the first indication information is used to indicate that the early sending compensation amount is a first round-trip delay; then, when determining the amount of the advance transmission compensation for the random access message according to the configuration information, the processing unit 502 is specifically configured to: determining propagation delay and first indication information from a reference point in a cell to a non-ground network gateway according to the configuration information; and determining the amount of the compensation to be sent in advance according to the propagation delay from the reference point in the cell to the non-ground network gateway.

In one possible example, if the propagation delay is the propagation delay from a reference point in a cell to a non-ground network gateway, the first indication information is used for indicating that the early sending compensation amount is a second round-trip delay; then, in terms of determining the amount of the advance transmission compensation for the random access message according to the configuration information, the processing unit 502 is specifically configured to: determining propagation delay and first indication information from a reference point in a cell to a non-ground network gateway according to the configuration information; determining the exclusive transmission time delay of the terminal according to preset satellite ephemeris information and the current position information of the terminal; and determining the compensation amount sent in advance according to the propagation delay from the reference point in the cell to the non-ground network gateway and the special transmission delay of the terminal.

In one possible example, if the propagation delay is the propagation delay from the satellite to the non-terrestrial network gateway, the first indication information is used to indicate that the sending advance compensation amount is the first round-trip delay; then, in terms of determining the amount of the advance transmission compensation for the random access message according to the configuration information, the processing unit 502 is specifically configured to: determining the propagation delay from the satellite to the non-ground network gateway and first indication information according to the configuration information; determining propagation delay from a reference point to a satellite in a cell according to preset satellite ephemeris information; and determining the early sending compensation amount according to the propagation delay from the satellite to the non-ground network gateway and the propagation delay from the reference point in the cell to the satellite.

In one possible example, the propagation delay is a propagation delay from a satellite to a non-terrestrial network gateway, and the first indication information is used for indicating that the early sending compensation amount is a second round-trip delay; then, in terms of determining the amount of the advance transmission compensation for the random access message according to the configuration information, the processing unit 502 is specifically configured to: determining the propagation delay from the satellite to the non-ground network gateway and first indication information according to the configuration information; determining propagation delay from a reference point to a satellite in a cell and special transmission delay of a terminal according to preset satellite ephemeris information and current position information of the terminal; and determining the advance sending compensation amount according to the propagation delay from the satellite to the non-ground network gateway, the propagation delay from the reference point in the cell to the satellite and the special transmission delay of the terminal.

In one possible example, the random access response window comprises the response window ra-ResponseWindow of msg2 or the response window msgB-ResponseWindow of msgB.

Where an integrated unit is employed, fig. 6 provides a block diagram of the functional elements of yet another non-terrestrial network communication device. The non-terrestrial network communication apparatus 600 is applied to a network device in a non-terrestrial network communication system, and specifically includes: a processing unit 602 and a communication unit 603. The processing unit 602 is configured to control and manage actions of the network device, for example, the processing unit 602 is configured to support the network device to execute the steps in fig. 4 and other processes used in the technical solutions described in this application. The communication unit 603 is used to support communication between the network device and other devices in the non-terrestrial network communication system. The non-terrestrial network communication device 600 may also include a storage unit 601 for storing program codes and data for network devices.

The processing unit 602 may be a processor or a controller, and may be, for example, a CPU, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processing unit 602 may also be a combination that performs computing functions, e.g., comprising one or more microprocessors, a combination of DSPs and microprocessors, or the like. The communication unit 603 may be a communication interface, a transceiver, a transceiving circuit, etc., and the storage unit 601 may be a memory. When the processing unit 602 is a processor, the communication unit 603 is a communication interface, and the storage unit 601 is a memory, the non-terrestrial network communication apparatus 600 according to the embodiment of the present application may be a network device shown in fig. 8.

In a specific implementation, the processing unit 602 is configured to perform any step performed by the network device in the above method embodiment, and when performing data transmission such as sending, optionally invokes the communication unit 603 to complete the corresponding operation. The details will be described below.

The processing unit 602 is configured to: and sending configuration information, wherein the configuration information is used for determining a window starting time offset, and the window starting time offset is used for indicating the offset of the delayed starting of the random access response window at a preset reference point.

In one possible example, in terms of sending the configuration information, the processing unit 602 is specifically configured to:

sending the configuration information through a system message.

In one possible example, the preset reference point includes a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message or a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message in the non-terrestrial network communication system.

In one possible example, a non-terrestrial network communication system includes a network device, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and a terminal; the configuration information includes at least one of: the window starting time offset, the propagation delay, the offset difference and the effective time of the propagation delay; the propagation delay comprises the propagation delay from a reference point in a cell to a non-ground network gateway or the propagation delay from a satellite to the non-ground network gateway; the offset difference comprises a difference between the offset of the response window starting time and a first round-trip delay or a difference between the offset of the window starting time and the transmission delay from the reference point in the cell to the non-ground network gateway, wherein the first round-trip delay is used for representing the round-trip delay between the reference point in the cell and the non-ground network gateway.

In one possible example, the configuration information is also used to determine an amount of advance transmission backoff for the random access message.

In one possible example, the random access response window includes the msg2 response window ra-ResponseWindow or the msgB response window msgB-ResponseWindow.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure. Terminal 700 includes, among other things, a processor 710, a memory 720, a communication interface 730, and at least one communication bus connecting processor 710, memory 720, and communication interface 730.

The memory 720 includes, but is not limited to, Random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (PROM), or compact disk read-only memory (CD-ROM), and the memory 720 is used for related instructions and data.

Communication interface 730 is used to receive and transmit data.

The processor 710 may be one or more CPUs, and in the case where the processor 710 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

The processor 710 in the terminal 700 is configured to read one or more programs 721 stored in the memory 720 and perform the following operations: acquiring configuration information; and determining a window starting time offset according to the configuration information, wherein the window starting time offset is used for representing the offset of the delayed starting of the random access response window by a preset reference point.

It should be noted that specific implementation of each operation may be described in the method embodiment shown in fig. 3, and the terminal 700 may be configured to execute the method on the terminal side in the method embodiment of the present application, which is not described herein again in detail.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a network device according to an embodiment of the present disclosure. Network device 800 includes processor 810, memory 820, communication interface 830, and at least one communication bus connecting processor 810, memory 820, and communication interface 830.

The memory 820 includes, but is not limited to, RAM, ROM, PROM, or CD-ROM, and the memory 820 is used for storing relevant instructions and data.

Communication interface 830 is used for receiving and transmitting data.

The processor 810 may be one or more CPUs, and in the case where the processor 810 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

The processor 810 in the network device 800 is configured to read one or more programs 821 stored in the memory 820, and perform the following operations: and sending configuration information, wherein the configuration information is used for determining a window starting time offset, and the window starting time offset is used for indicating the offset of the delayed starting of the random access response window at a preset reference point.

It should be noted that specific implementation of each operation may be described in the method embodiment shown in fig. 4, and the network device 800 may be configured to execute the method on the network device side in the method embodiment of the present application, which is not described herein again in detail.

The present application further provides a chip, where the chip includes a processor, and is configured to call and run a computer program from a memory, so that a device in which the chip is installed performs some or all of the steps described in the terminal or the network device in the foregoing method embodiments.

The present application also provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program makes a computer perform some or all of the steps described in the above method embodiments for a terminal or a network device.

Embodiments of the present application further provide a computer program product, where the computer program product includes a computer program operable to cause a computer to perform some or all of the steps described in the above method embodiments for a terminal or a network device. The computer program product may be a software installation package.

The steps of a method or algorithm described in the embodiments of the present application may be implemented in hardware, or may be implemented by a processor executing software instructions. The software instructions may consist of corresponding software modules that may be stored in RAM, flash memory, ROM, Erasable Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM), registers, a hard disk, a removable hard disk, a compact disc read only memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a terminal or network device. Of course, the processor and the storage medium may reside as discrete components in a terminal or network device.

Those skilled in the art will appreciate that in one or more of the examples described above, the functionality described in the embodiments of the present application may be implemented, in whole or in part, by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the embodiments of the present application in further detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims

1. A non-ground network communication method is characterized in that the method is applied to a terminal in a non-ground network communication system; the method comprises the following steps:

acquiring configuration information;

2. The method of claim 1, wherein the obtaining the configuration information comprises:

when the terminal initiates a random access process, receiving a system message currently sent by network equipment in the non-ground network communication system to acquire the configuration information; alternatively, the first and second electrodes may be,

when the terminal initiates a random access process and the propagation delay in the system message received last time by the terminal exceeds the effective time, receiving the system message currently sent by the network equipment to acquire the configuration information; alternatively, the first and second electrodes may be,

and when the terminal initiates a random access process and the propagation delay in the system message received last time by the terminal does not exceed the effective time, acquiring the configuration information from the system message received last time.

3. The method of claim 1, wherein the predetermined reference point comprises a first symbol of a first Physical Downlink Control Channel (PDCCH) detection opportunity after the terminal sends the random access message or a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message.

4. The method according to claim 3, characterized in that the random access message comprises a random access preamble msg1 or a random access message msgA.

5. The method of claim 4, wherein the non-terrestrial network communication system comprises the terminal, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and the network device; the configuration information includes at least one of: the window starting moment offset, the propagation delay, the offset difference and the effective time of the propagation delay; wherein the content of the first and second substances,

the propagation delay comprises the propagation delay from the reference point in the cell to the non-ground network gateway or the propagation delay from the satellite to the non-ground network gateway;

the offset difference amount comprises a difference amount between the window starting time offset amount and a first round trip delay or a difference amount between the window starting time offset amount and the transmission delay from the reference point in the cell to the non-ground network gateway, and the first round trip delay is used for representing the round trip delay between the reference point in the cell and the non-ground network gateway.

6. The method of claim 5, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends a random access message, the offset difference is a difference between an offset at the window starting time and a first round trip delay, and the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway; then

The determining the window starting time offset according to the configuration information includes:

determining the propagation delay and the offset difference from the reference point in the cell to the non-ground network gateway according to the configuration information;

and determining the offset of the window starting time according to the propagation delay from the reference point in the cell to the non-ground network gateway and the offset difference.

7. The method of claim 6, wherein the determining the window start time offset according to the propagation delay from the reference point in the cell to the non-terrestrial network gateway and the offset difference comprises:

determining the first round-trip delay according to the propagation delay from the reference point in the cell to the non-ground network gateway;

calculating a sum between the first round trip delay and the offset delta to obtain a first sum;

and rounding up the first sum according to a preset time slot length to obtain the offset of the window starting time.

8. The method of claim 5, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends a random access message, the offset difference is a difference between an offset of the window start time and a first round trip delay, and the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway; then

determining the propagation delay and the offset difference from the satellite to the non-ground network gateway according to the configuration information;

determining the propagation delay from the reference point in the cell to the satellite according to preset satellite ephemeris information;

and determining the offset of the window starting time according to the propagation delay from the satellite to the non-ground network gateway, the offset difference and the propagation delay from the reference point in the cell to the satellite.

9. The method of claim 8, wherein determining the window start time offset according to the propagation delay of the satellite to the non-terrestrial network gateway, the offset delta, and the propagation delay of the intra-cell reference point to the satellite comprises:

determining the first round-trip delay according to the propagation delay from the satellite to the non-ground network gateway and the propagation delay from the reference point in the cell to the satellite;

calculating a sum between the first round trip delay and the offset delta to obtain a second sum;

and rounding up the second sum according to the preset time slot length to obtain the offset of the window starting time.

10. The method according to claim 5, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after a random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset of the window start time and a transmission delay from the reference point in the cell to the non-terrestrial network gateway, and the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway; then

calculating a sum of the propagation delay from the reference point in the cell to the non-ground network gateway and the offset difference to obtain a third sum;

and rounding up the third sum according to the preset time slot length to obtain the offset of the window starting time.

11. The method according to claim 5, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after a random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset of the window start time and a transmission delay from the reference point in the cell to the non-terrestrial network gateway, and the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway; then

determining the propagation delay from the reference point in the cell to the satellite according to the preset satellite ephemeris information;

calculating a sum of the propagation delay from the satellite to the non-terrestrial network gateway, the propagation delay from the reference point in the cell to the satellite, and the offset delta to obtain a fourth sum;

and rounding up the fourth sum according to the preset time slot length to obtain the offset of the window starting time.

12. The method of claim 5, further comprising:

and determining the advance sending compensation amount aiming at the random access message according to the configuration information.

13. The method of claim 12, wherein the configuration information further comprises: the first indication information is used for indicating that the early sending compensation quantity is the first round-trip delay or the second round-trip delay, and the second round-trip delay is used for representing the round-trip delay between the terminal and the non-ground network gateway.

14. The method of claim 13, wherein the second round trip delay is determined by a transmission delay from the reference point in the cell to the non-terrestrial network gateway and a terminal-specific transmission delay; and the terminal-specific transmission delay is used for representing a difference value between the transmission delay from the terminal to the satellite and the transmission delay from the reference point in the cell to the satellite.

15. The method of claim 14, wherein if the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway, the first indication information is used to indicate that the early transmission compensation amount is the first round trip delay; then

The determining, according to the configuration information, an amount of advance transmission backoff for the random access message includes:

determining the propagation delay from the reference point in the cell to the non-ground network gateway and the first indication information according to the configuration information;

and determining the early sending compensation amount according to the propagation delay from the reference point in the cell to the non-ground network gateway.

16. The method of claim 14, wherein if the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway, the first indication information is used to indicate that the early transmission compensation amount is the second round trip delay; then

determining the exclusive transmission time delay of the terminal according to the preset satellite ephemeris information and the current position information of the terminal;

and determining the early sending compensation quantity according to the propagation delay from the reference point in the cell to the non-ground network gateway and the exclusive transmission delay of the terminal.

17. The method of claim 14, wherein if the propagation delay is the propagation delay from the satellite to the non-terrestrial network gateway, the first indication information is used to indicate that the early transmission offset is the first round trip delay; then

determining the propagation delay from the satellite to the non-ground network gateway and the first indication information according to the configuration information;

and determining the advance sending compensation amount according to the propagation delay from the satellite to the non-ground network gateway and the propagation delay from the reference point in the cell to the satellite.

18. The method of claim 14, wherein the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway, and the first indication information is used to indicate that the early transmission compensation amount is the second round trip delay; then

determining propagation delay from a reference point in the cell to the satellite and exclusive transmission delay of the terminal according to the preset satellite ephemeris information and the current position information of the terminal;

and determining the early sending compensation quantity according to the propagation delay from the satellite to the non-ground network gateway, the propagation delay from the reference point in the cell to the satellite and the exclusive transmission delay of the terminal.

19. The method according to any of claims 1-18, wherein said random access response window comprises the response window ra-ResponseWindow of msg2 or the response window msgB-ResponseWindow of msgB.

20. A non-ground network communication method is characterized in that the method is applied to network equipment in a non-ground network communication system; the method comprises the following steps:

21. The method of claim 20, wherein the sending the configuration information comprises:

sending the configuration information through a system message.

22. The method of claim 20, wherein the predetermined reference point comprises a first symbol of a first Physical Downlink Control Channel (PDCCH) detection opportunity after a terminal in the non-terrestrial network communication system sends a random access message or a first symbol of a first PDCCH detection opportunity after a random access opportunity where the terminal sends the random access message.

23. The method according to claim 22, wherein the random access message comprises a random access preamble msg1 or a random access message msgA.

24. The method of claim 23, wherein the non-terrestrial network communication system comprises the network device, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and the terminal; the configuration information includes at least one of: the window starting moment offset, the propagation delay, the offset difference and the effective time of the propagation delay; wherein the content of the first and second substances,

the offset difference comprises a difference between the response window starting time offset and a first round trip delay or a difference between the window starting time offset and the transmission delay from the reference point in the cell to the non-terrestrial network gateway, and the first round trip delay is used for representing the round trip delay between the reference point in the cell and the non-terrestrial network gateway.

25. The method of claim 24, wherein the configuration information is further used for determining an amount of early transmission backoff for the random access message.

26. The method of claim 25, wherein the configuration information further comprises: the first indication information is used for indicating that the early sending compensation quantity is the first round-trip delay or the second round-trip delay, and the second round-trip delay is used for representing the round-trip delay between the terminal and the non-ground network gateway.

27. The method according to any of claims 20-26, wherein said random access response window comprises msg2 response window ra-ResponseWindow or msgB response window msgB-ResponseWindow.

28. A non-ground network communication device is characterized in that the device is applied to a terminal in a non-ground network communication system; the apparatus comprises a processing unit and a communication unit, the processing unit being configured to:

acquiring configuration information through the communication unit;

29. The apparatus of claim 28, wherein the processing unit, to obtain the configuration information, is specifically configured to:

30. The apparatus of claim 28, wherein the predetermined reference point comprises a first symbol of a first PDCCH detection opportunity after the terminal sends a random access message or a first symbol of a first PDCCH detection opportunity after the terminal sends the random access message.

31. The apparatus of claim 30, wherein the random access message comprises a random access preamble msg1 or a random access message msgA.

32. The apparatus of claim 31, wherein the non-terrestrial network communication system comprises the terminal, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and a network device; the configuration information includes at least one of: the window starting moment offset, the propagation delay, the offset difference and the effective time of the propagation delay; wherein the content of the first and second substances,

33. The apparatus of claim 32, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends a random access message, the offset difference is a difference between an offset at the window start time and a first round trip delay, and the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway; then

The determining, according to the configuration information, a window start time offset, where the processing unit is specifically configured to:

34. The apparatus according to claim 33, wherein the processing unit is specifically configured to determine the window start time offset according to the propagation delay from the reference point in the cell to the non-terrestrial network gateway and the offset difference amount, and wherein the processing unit is configured to:

35. The apparatus of claim 32, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after the terminal sends a random access message, the offset difference is a difference between an offset of the window start time and a first round trip delay, and the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway; then

36. The apparatus according to claim 35, wherein the processing unit is specifically configured to determine the window start time offset according to a propagation delay from the satellite to the non-terrestrial network gateway, the offset difference amount, and a propagation delay from the intra-cell reference point to the satellite, and wherein the processing unit is configured to:

37. The apparatus of claim 32, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after a random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset of the window start time and a transmission delay from the reference point in the cell to the non-terrestrial network gateway, and the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway; then

38. The apparatus of claim 32, wherein if the predetermined reference point is a first symbol of a first PDCCH detection opportunity after a random access opportunity where the random access message is sent by the terminal, the offset difference is a difference between an offset of the window start time and a transmission delay from the reference point in the cell to the non-terrestrial network gateway, and the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway; then

39. The apparatus of claim 32, wherein the processing unit is further configured to:

40. The apparatus of claim 39, wherein the configuration information further comprises: the first indication information is used for indicating that the early sending compensation quantity is the first round-trip delay or the second round-trip delay, and the second round-trip delay is used for representing the round-trip delay between the terminal and the non-ground network gateway.

41. The apparatus of claim 40, wherein the second round trip delay is determined by a transmission delay from the reference point in the cell to the non-terrestrial network gateway and a terminal-specific transmission delay; and the terminal-specific transmission delay is used for representing a difference value between the transmission delay from the terminal to the satellite and the transmission delay from the reference point in the cell to the satellite.

42. The apparatus according to claim 41, wherein if the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway, the first indication information is used to indicate that the early transmission compensation amount is the first round trip delay; then

The determining, according to the configuration information, a compensation amount to be sent in advance for the random access message, where the processing unit is specifically configured to:

43. The apparatus according to claim 41, wherein if the propagation delay is a propagation delay from the reference point in the cell to the non-terrestrial network gateway, the first indication information is used to indicate that the sending-ahead compensation amount is the second round trip delay; then

44. The apparatus of claim 41, wherein if the propagation delay is the propagation delay from the satellite to the non-terrestrial network gateway, the first indication information is used to indicate that the early transmission offset is the first round trip delay; then

45. The apparatus according to claim 41, wherein the propagation delay is a propagation delay from the satellite to the non-terrestrial network gateway, and the first indication information is used to indicate that the early transmission compensation amount is the second round trip delay; then

46. The apparatus according to any of claims 28-45, wherein the random access response window comprises a response window ra-ResponseWindow of msg2 or a response window msgB-ResponseWindow of msgB.

47. A non-ground network communication device is characterized in that the device is applied to network equipment in a non-ground network communication system; the apparatus comprises a processing unit and a communication unit, the processing unit being configured to:

48. The apparatus of claim 47, wherein the processing unit, to send the configuration information, is specifically configured to:

sending the configuration information through a system message.

49. The apparatus of claim 47, wherein the predetermined reference point comprises a first symbol of a first Physical Downlink Control Channel (PDCCH) detection opportunity after a random access message is sent by a terminal in the non-terrestrial network communication system or a first symbol of a first PDCCH detection opportunity after a random access opportunity where the random access message is sent by the terminal.

50. The apparatus of claim 49, wherein the random access message comprises a random access preamble msg1 or a random access message msgA.

51. The apparatus of claim 50, wherein the non-terrestrial network communication system comprises the network device, an intra-cell reference point, a satellite, a non-terrestrial network gateway, and the terminal; the configuration information includes at least one of: the window starting moment offset, the propagation delay, the offset difference and the effective time of the propagation delay; wherein the content of the first and second substances,

52. The apparatus of claim 51, wherein the configuration information is further configured to determine an amount of early transmission backoff for the random access message.

53. The apparatus of claim 52, wherein the configuration information further comprises: the first indication information is used for indicating that the early sending compensation quantity is the first round-trip delay or the second round-trip delay, and the second round-trip delay is used for representing the round-trip delay between the terminal and the non-ground network gateway.

54. The apparatus according to any of claims 47-53, wherein the random access response window comprises msg2 response window ra-ResponseWindow or msgB response window msgB-ResponseWindow.

55. A terminal comprising a processor, memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs including instructions for performing the steps in the method of any of claims 1-19.

56. A network device comprising a processor, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs including instructions for performing the steps in the method of any of claims 20-27.

57. A computer-readable storage medium, characterized in that it stores a computer program for electronic data exchange, wherein the computer program causes a computer to perform the method according to any one of claims 1-19 or 20-27.