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CN-122002502-A - Communication method, communication device, computer program product, and readable storage medium

CN122002502ACN 122002502 ACN122002502 ACN 122002502ACN-122002502-A

Abstract

The embodiment of the application provides a communication method, communication equipment, a computer program product and a readable storage medium, and relates to the technical field of communication. The UE is accessed to the first communication equipment, the UE can acquire a first Doppler frequency offset of the UE relative to the first communication equipment, and the UE obtains a second Doppler frequency offset of the UE relative to the second communication equipment according to the first estimated frequency offset, the second estimated frequency offset and the first Doppler frequency offset of the UE relative to the first communication equipment. And the UE calculates the transmission distance between the UE and the second communication equipment according to the second Doppler frequency offset, and calculates the timing advance TA of the UE relative to the second communication equipment according to the transmission distance, wherein the TA is used for synchronizing the communication between the UE and the second communication equipment. Therefore, under the condition that the UE is not accessed to the second communication equipment, the more accurate TA of the UE relative to the second communication equipment can be obtained, and the communication synchronization degree and accuracy of the UE relative to the second communication equipment are improved.

Inventors

  • DUN HAN

Assignees

  • 荣耀终端股份有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (12)

  1. 1. A communication method, applied to a user equipment UE, comprising: Acquiring a first estimated frequency offset of the UE relative to a first communication device and a second estimated frequency offset of the UE relative to a second communication device, wherein the first communication device is a service communication device of the UE, and the second communication device is a communication device which is to take over the network service provided by the first communication device for the UE; Obtaining a second Doppler frequency offset of the UE relative to second communication equipment according to the first estimated frequency offset, the second estimated frequency offset and the first Doppler frequency offset of the UE relative to first communication equipment; Calculating the transmission distance between the UE and the second communication equipment according to the second Doppler frequency offset; And calculating the timing advance TA of the UE relative to the second communication equipment according to the transmission distance, wherein the TA is used for synchronizing the communication between the UE and the second communication equipment.
  2. 2. The communication method according to claim 1, wherein the obtaining the second doppler shift of the UE with respect to the second communication device according to the first estimated shift, the second estimated shift and the first doppler shift of the UE with respect to the first communication device includes: calculating the difference value of the first estimated frequency offset and the second estimated frequency offset to obtain a differential estimated frequency offset; and calculating the difference value of the first Doppler frequency offset and the differential estimated frequency offset to obtain the second Doppler frequency offset.
  3. 3. The communication method of claim 2, wherein the first estimated frequency offset comprises a first doppler frequency offset and a first local oscillator frequency offset, the second estimated frequency offset comprises the second doppler frequency offset and the second local oscillator frequency offset, and the first local oscillator frequency offset is equal to the second local oscillator frequency offset.
  4. 4. A communication method according to claim 2 or 3, wherein the first doppler shift is determined based on a time of arrival of the first communication device at a maximum angle of incidence with respect to the UE, a cosine value of the maximum angle of incidence, and a time difference between a current time of arrival and the time of arrival of the maximum angle of incidence.
  5. 5. The communication method according to claim 4, wherein the first doppler frequency offset f d s (t) satisfies: Wherein f c denotes a carrier frequency of the first communication device, c denotes a speed of light, r e denotes an earth radius, r o denotes a track height of the first communication device, and ω F denotes an angular speed at which the first communication device moves; and, said t represents said current time, said For a maximum angle of incidence of the first communication device with respect to the UE, the Indicating the arrival time of the maximum incident angle, the A cosine value representing the maximum angle of incidence.
  6. 6. The communication method according to any one of claims 1-5, wherein the calculating the transmission distance between the UE and the second communication device according to the second doppler bias comprises: according to the value of the second Doppler frequency offset at least two moments, obtaining a Doppler frequency offset function of the UE relative to the second communication equipment through linear fitting; calculating a first moment corresponding to a zero value of the Doppler frequency offset function, wherein the first moment is a moment when the incident angle of the second communication equipment relative to the UE is a first maximum incident angle; Calculating a cosine value of a first included angle corresponding to the first maximum incident angle according to the second Doppler frequency offset and the first moment, wherein the first included angle is an included angle between a first straight line and a second straight line, the first straight line is a connecting line between a sub-satellite point corresponding to the second communication equipment and a geocenter, and the second straight line is a connecting line between the UE and the sub-satellite point corresponding to the second communication equipment; And determining the transmission distance between the UE and the second communication equipment according to the cosine value of the first time and the first included angle.
  7. 7. The communication method according to claim 6, wherein calculating the cosine value of the first angle corresponding to the first maximum incident angle according to the second doppler shift and the first time, comprises: Obtaining a function relation corresponding to the cosine value of the first included angle according to the second Doppler frequency offset, the first moment and the calculation formula of the second Doppler frequency offset; and solving a functional relation corresponding to the cosine value of the first included angle to obtain the cosine value of the first included angle.
  8. 8. The communication method according to claim 7, wherein the calculation formula of the second doppler shift comprises: and/or the number of the groups of groups, The functional relation corresponding to the cosine value of the first included angle satisfies the following conditions: wherein Θ (α max ) represents the cosine of the first angle, f c represents the carrier frequency of the second communication device, c represents the speed of light, r e represents the earth radius, r o represents the orbit height of the second communication device, ω F represents the angular velocity of the second communication device movement, t represents the current time, and For the first maximum incident angle, the Representing the first moment.
  9. 9. A communication method according to any one of claims 1 to 8, characterized in that, The first communication device comprises a low-orbit satellite or a medium-orbit satellite; the second communication device comprises a low-orbit satellite or a medium-orbit satellite.
  10. 10. The communication device is characterized by comprising a transceiver, a memory and a processor, wherein the transceiver, the memory and the processor are coupled; The transceiver being for communication with a first communication device and a second communication device, the memory being for storing computer program code comprising computer instructions which, when executed by the communication devices, cause the communication devices to perform the communication method of any of claims 1 to 9.
  11. 11. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein instructions, which when run in a communication device, cause the communication device to perform the communication method according to any of claims 1 to 9.
  12. 12. A computer program product comprising instructions which, when executed in a communication device, cause the communication device to perform the communication method according to any of claims 1 to 9.

Description

Communication method, communication device, computer program product, and readable storage medium Technical Field Embodiments of the present application relate to the field of communications technologies, and in particular, to a communication method, a communication device, a computer program product, and a readable storage medium. Background Communication networks are mainly classified into terrestrial networks and non-terrestrial networks (non-TERRESTRIAL NETWORK, NTN), where non-terrestrial networks refer to networks that implement global communication coverage using non-terrestrial communication infrastructure such as satellites, high-altitude platforms (e.g., drones, stratospheric balloons, etc.). In a non-terrestrial network, a network device moves at a high speed relative to a User Equipment (UE), and the UE switches connections between different network devices. In the NTN scene, compared with the state that the UE is in high-speed motion, the relative position and the change rate of the relative speed of the UE and the satellite are very high, the distance between the satellite and the UE needs to be calculated in real time based on the position information of the satellite and the position information of the UE, and the data calculation of communication transmission is carried out based on the distance between the satellite and the UE, so that the timely synchronization of communication is ensured. The data calculation comprises estimating time advance (TIMING ADVANCE, TA), calibrating receiving and transmitting parameters of the UE and uplink and downlink synchronization between the UE and a satellite based on the TA, and ensuring normal access of uplink and downlink services of the UE. The existing TA calculation scheme comprises that before the UE is switched to a neighboring satellite from a current satellite, a measurement event is triggered, reference signal receiving power (REFERENCE SIGNAL RECEIVING power, RSRP) and reference signal receiving quality (REFERENCE SIGNAL RECEIVED quality, RSRQ) are calculated by using a downlink reference signal of the neighboring satellite, so that path transmission loss is calculated, then the transmission distance between the UE and the neighboring satellite is calculated based on free space path loss (free-SPACE PATH loss, FSPL), and TA is calculated according to the transmission distance. Under the NTN scene, the change of the RSRP/RSRQ is too small, and the error of the transmission distance and TA calculated according to the change of the RSRP/RSRQ is larger, so that the communication synchronization effect between the UE and the adjacent satellite is poor. Disclosure of Invention The embodiment of the application provides a communication method, communication equipment, a computer program product and a readable storage medium, which are used for solving the technical problem that the communication synchronization effect between UE and a neighboring satellite is poor in the existing communication scheme. In order to achieve the above purpose, the embodiment of the present application adopts the following technical scheme: In a first aspect, a communication method is provided, applied to a user equipment UE, involving communication of the UE with respect to a first communication device and communication of the UE with respect to a second communication device. The first communication device is a service communication device of the UE, and the second communication device is a communication device which is to take over the network service provided by the first communication device for the UE. The communication scene applied by the embodiment of the application can be a ground communication scene or a non-ground communication scene. In a ground communication scene, the first communication equipment and the second communication equipment are fixed ground base stations, the UE is user equipment applicable to fast moving carriers such as high-speed rails, and the ground base stations move at a high speed relative to the UE. Or may be extended to a communication scenario where other UEs and network devices move at relatively high speed, without limitation. In a non-terrestrial communication scenario, the first communication device and the second communication device may be satellites, for example, the first communication device may be a source satellite and the second communication device may be a target satellite. Alternatively, the first communication device and the second communication device may be other devices that are deployed at high altitude and that have the capability of providing network services to the first communication device, which is not limited. The first and second communication devices may comprise satellites having a relatively low orbit height, for example low orbit satellites having an orbit height of 500-2000 km, or medium orbit satellites having an orbit height of 8000-20000 km, in which case the frequency of cell handover of the UE is