Communication method, terminal, network device, and storage medium
This application discloses a communication method. The method includes: A terminal device obtains a first message, where the first message carries target adjustment information. The terminal device obtains a second message, where the second message carries a timing advance (TA). The terminal device adjusts uplink sending time based on the target adjustment information and the TA. Embodiments of this application further provide a corresponding terminal device, network device, and storage medium.
1. A communication method, comprising:
receiving, by a terminal device, a first message from a satellite, wherein the first message includes target adjustment information;
receiving, by the terminal device, a second message, wherein the second message includes a timing advance (TA);
determining, by the terminal device based on the target adjustment information, a delay time;
determining, by the terminal device based on the TA, a first uplink sending time; and
adjusting, by the terminal device, an uplink sending time by delaying the first uplink sending time with the delay time,
wherein the method further comprises:
after sending a message msg3, starting, by the terminal device, a first timer after a preset duration, wherein the first timer monitors a contention resolution message msg4.
2. The method according to claim 1 , wherein the delay time is determined based on a correspondence between the target adjustment information and a first subcarrier spacing, wherein the first subcarrier spacing is a subcarrier spacing used by the terminal device, and the correspondence is prestored in the terminal device.
3. The method according to claim 1 , wherein the target adjustment information indicates an adjustment time of the uplink sending time corresponding to a second subcarrier spacing, and
wherein determining, by the terminal device based on the target adjustment information, the delay time comprises:
in response to that a subcarrier spacing of the terminal device is a third subcarrier spacing, determining, by the terminal device, the delay time based on a relationship between the third subcarrier spacing and the second subcarrier spacing.
4. The method according to claim 1 , wherein the first message
is a system information block (SIB) message, wherein the SIB message includes the target adjustment information.
5. The method according to claim 1 , wherein the first message
is a downlink control information (DCI) message, wherein the DCI message includes the target adjustment information.
6. The method according to claim 1 , wherein receiving, by the terminal device, the first message comprises:
receiving, by the terminal device, a random access response message msg2, wherein the random access response message msg2 comprises a cyclic redundancy check (CRC) code, and the CRC code is scrambled by using a random access radio network temporary identifier (RA-RNTI) and the target adjustment information; and
before determining, by the terminal device based on the target adjustment information, a delay time, the method further comprises:
performing, by the terminal device, a descrambling operation on the CRC code to obtain the target adjustment information.
7. The method according to claim 1 , wherein receiving, by the terminal device, the first message comprises:
receiving, by the terminal device, a system information block (SIB) message, wherein the SIB message includes first target adjustment information; and
receiving, by the terminal device, a downlink control information (DCI) message, wherein the DCI message includes second target adjustment information, and
wherein the delay time is determined based on the first target adjustment information, the second target adjustment information, and the TA.
8. The method according to claim 1 , wherein receiving, by the terminal device, the first message comprises:
obtaining, by the terminal device, a physical cell identifier (PCI), wherein the PCI is bound to an included angle α, and the included angle α is a horizontal included angle between a cell and the satellite; and
wherein the delay time is determined based on the included angle α and according to a preset formula.
9. The method according to claim 1 , wherein receiving, by the terminal device, the first message comprises:
receiving, by the terminal device, a broadcast message sent by the satellite, wherein the broadcast message includes location information of the satellite; and
wherein the delay time is determined based on location information of the terminal device and the location information of the satellite.
10. A communication method, comprising:
sending, by a satellite, a first message, wherein the first message includes target adjustment information;
sending, by the satellite, a second message, wherein the second message includes a timing advance (TA), the target adjustment information is used to determine a delay time, and the TA is used to determine a first uplink sending time;
sending, by the satellite, a broadcast message, wherein the broadcast message includes location information of the satellite; and
receiving, by the satellite, an uplink transmission sent at an uplink sending time, wherein the uplink sending time is the first uplink sending time delayed by the delay time.
11. The method according to claim 10 , wherein the first message comprises a system information block (SIB) message, wherein the SIB message includes the target adjustment information.
12. A terminal device, comprising:
at least one processor coupled to a communication interface;
the communication interface coupled to one or more memories; and
the one or more memories coupled to the at least one processor and storing computer readable instructions for execution by the at least one processor to:
receive, through the communication interface, a first message from a satellite, wherein the first message includes target adjustment information;
receive, through the communication interface, a second message, wherein the second message includes a timing advance (TA);
determine, based on the target adjustment information, a delay time;
determine, based on the TA, a first uplink sending time; and
adjust an uplink sending time by delaying the first uplink sending time with the delay time;
wherein the at least one processor is further enabled to:
after sending a message msg3, start a first timer after a preset duration, wherein the first timer monitors a contention resolution message msg4.
13. The terminal device according to claim 12 , wherein
the delay time is determined based on a correspondence between the target adjustment information and a first subcarrier spacing, wherein the first subcarrier spacing is a subcarrier spacing used by the terminal device, and the correspondence is prestored in the terminal device.
14. The terminal device according to claim 12 , wherein the target adjustment information indicates an adjustment time of the uplink sending time corresponding to a second subcarrier spacing, and
wherein the one or more memories store the computer-readable instructions for execution by the at least one processor to:
in response to that a subcarrier spacing of the terminal device is a third subcarrier spacing, determine the delay time based on a preset relationship between the third subcarrier spacing and the second subcarrier spacing.
15. The terminal device according to claim 12 , wherein
the communication interface is configured to receive a system information block (SIB) message, wherein the SIB message includes the target adjustment information.
16. The terminal device according to claim 12 , wherein
the communication interface is configured to receive a downlink control information (DCI) message, wherein the DCI message includes the target adjustment information.
17. The terminal device according to claim 12 , wherein
the communication interface is configured to receive a random access response message msg2, wherein the random access response message msg2 comprises a cyclic redundancy check (CRC) code, and the CRC code is scrambled by using a random access radio network temporary identifier (RA-RNTI) and the target adjustment information; and wherein
the one or more memories store the computer-readable instructions for execution by the at least one processor to perform a descrambling operation on the CRC code to obtain the target adjustment information.
18. The terminal device according to claim 12 , wherein
the communication interface is configured to receive a system information block (SIB) message, wherein the SIB message includes first target adjustment information; and
the communication interface is configured to receive a downlink control information (DCI) message, wherein the DCI message includes second target adjustment information, and wherein the delay time is determined based on the first target adjustment information, the second target adjustment information, and the TA.
19. The terminal device according to claim 12 , wherein
the communication interface is configured to obtain a physical cell identifier (PCI), wherein the PCI is bound to an included angle α, and the included angle α is a horizontal included angle between a cell and the satellite, and wherein the delay time is determined based on the included angle α.
20. The terminal device according to claim 12 , wherein the one or more memories are integrated into the at least one processor.