Patent ID: 11882604
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A random access method applicable to satellite communication, the method comprising:
obtaining a round-trip transmission latency (tRTD) of a signal between a terminal device and a satellite;
obtaining a random access parameter based on the round-trip transmission latency, wherein the random access parameter comprises at least one of tX, tY, tbackoff, or tsubframe, wherein
tX represents a duration between a moment at which the terminal device sends a random access preamble to the satellite and a moment at which the terminal device starts to receive a random access response (RAR) from the satellite,
tY represents a duration of a window in which the terminal device receives the RAR,
tbackoff represents a duration between a moment at which the terminal device stops receiving the RAR and a moment at which the terminal device sends the random access preamble again, and
tsubframe represents a subframe duration; and

receiving, by the terminal device, the RAR from the satellite based on the random access parameter,
wherein the obtaining the round-trip transmission latency comprises:
obtaining a parameter used to calculate the round-trip transmission latency between the terminal device and the satellite, wherein the parameter comprises orbital height information of the satellite, ephemeris information of the satellite, and position information of the terminal device; and
calculating the round-trip transmission latency based on the parameter.