Random access method, terminal device, network device and storage medium
View Patent ↗Disclosed is a random access method, including: determining, by a terminal device, a target time according to an offset which is a time parameter related to a propagation delay between the terminal device and a network device; and transmitting, by the terminal device, a random access request to the network device based on the target time. Further disclosed are another five random access methods, a terminal device, a network device and a storage medium.
1. A random access method, wherein the method comprises:
determining, by a terminal device, a target time according to an offset; and
transmitting, by the terminal device, a random access request to a network device based on the target time;
wherein a type of the random access is a first type of random access, a triggering mode of the random access is triggering by a physical downlink control channel (PDCCH) order, the determining the target time according to the offset comprises:
determining a random access occasion in a physical random access channel (PRACH) resource according to a last symbol of the PDCCH order and the offset, wherein a time interval between the last symbol of the PDCCH order and a first symbol of the random access occasion is greater than a duration corresponding to the offset.
2. The method according to claim 1 , wherein
the offset is predefined by the terminal device; or
the offset is configured by the network device.
3. The method according to claim 2 , wherein when the offset is configured by the network device, the offset is configured by the network device through at least one of the following signalings:
a system broadcast message;
a PDCCH signaling;
a radio resource control signaling; and
a media access control control element signaling.
4. The method according to claim 1 , wherein the method further comprises:
determining, by the terminal device, a starting time of a random access response (RAR) window according to the offset.
5. The method according to claim 4 , wherein the starting time of the RAR window is: a control resource set in a PDCCH common search space set configured for the terminal device, wherein the control resource set is at an earliest time position where the terminal device receives a PDCCH and the earliest time position is at a time after a duration corresponding to a specific offset after a last symbol of a random access occasion where the terminal device transmits a PRACH, wherein the duration corresponding to the specific offset is a sum of a specific duration and the duration corresponding to the offset.
6. The method according to claim 1 , wherein the method further comprises:
determining, by the terminal device, a target time slot according to the offset; and
transmitting, by the terminal device, a physical uplink shared channel (PUSCH) for carrying message 3 based on the target time slot.
7. The method according to claim 6 , wherein the determining the target time slot according to the offset comprises:
determining the target time slot according to a reference time slot and the offset, wherein the reference time slot is a time slot in which a physical downlink shared channel (PDSCH) carrying a RAR message is received.
8. The method according to claim 1 , wherein the method further comprises:
monitoring, by the terminal device, a PDCCH carrying a contention resolution message based on the offset.
9. The method according to claim 8 , wherein the monitoring the PDCCH carrying the contention resolution message based on the offset comprises:
starting a random access contention resolution timer at a time after the duration corresponding to the offset after a time of transmitting message 3, and restarting the random access contention resolution timer at a first symbol after the duration corresponding to the offset after a time of retransmitting message 3; wherein the PDCCH carrying the contention resolution message is monitored during operation of the random access contention resolution timer.
10. The method according to claim 8 , wherein the monitoring the PDCCH carrying the contention resolution message based on the offset comprises:
starting a random access contention resolution timer after message 3 is transmitted, and restarting the random access contention resolution timer after message 3 is retransmitted; wherein the PDCCH carrying the contention resolution message is monitored after the random access contention resolution timer runs for the duration corresponding to the offset.
11. A random access method, wherein the method comprises:
configuring, by a network device, an offset to a terminal device, and the offset is used for the terminal device to control transmitting of a random access request;
wherein a type of the random access is a first type of random access, a triggering mode of the random access is triggering by a physical downlink control channel (PDCCH) order, the offset is used by the terminal device to determine a random access occasion in a physical random access channel (PRACH) resource according to a last symbol of the PDCCH order and the offset, wherein a time interval between the last symbol of the PDCCH order and a first symbol of the random access occasion is greater than a duration corresponding to the offset.
12. The method according to claim 11 , wherein the configuring the offset to the terminal device comprises:
transmitting a configuration message carrying the offset to the terminal device.
13. The method according to claim 12 , wherein the configuration message comprises at least one of the following:
a system broadcast message;
a PDCCH signaling;
a radio resource control signaling; and
a media access control control element signaling.
14. The method according to claim 11 , wherein the method further comprises:
receiving, by the network device, a physical uplink shared channel (PUSCH) carrying message 3 according to the offset.
15. The method according to claim 14 , wherein the receiving the PUSCH carrying message 3 according to the offset comprises:
receiving the PUSCH carrying message 3 at a time after the duration corresponding to the offset after a time of transmitting a random access response (RAR).
16. A terminal device, comprising a processor and a memory for storing a computer program that is runnable on the processor, wherein when the processor is used to run the computer program, the processor is configured to:
determine a target time according to an offset; and
control an output interface to transmit a random access request to a network device based on the target time;
wherein a type of the random access is a first type of random access, a triggering mode of the random access is triggering by a physical downlink control channel (PDCCH) order, the processor is configured to:
determine a random access occasion in a physical random access channel (PRACH) resource according to a last symbol of the PDCCH order and the offset, wherein a time interval between the last symbol of the PDCCH order and a first symbol of the random access occasion is greater than a duration corresponding to the offset.
17. The terminal device according to claim 16 , wherein
the offset is predefined by the terminal device; or
the offset is configured by the network device.
18. The terminal device according to claim 17 , wherein when the offset is configured by the network device, the offset is configured by the network device through at least one of the following signalings:
a system broadcast message;
a PDCCH signaling;
a radio resource control signaling; and
a media access control control element signaling.
19. The terminal device according to claim 16 , the processor is further configured to:
determine a starting time of a random access response (RAR) window according to the offset.
20. A network device, comprising a processor and a memory for storing a computer program that is runnable on the processor, wherein when the processor is used to run the computer program, the processor is configured to:
configure an offset to a terminal device and the offset is used for the terminal device to control transmitting of a random access request;
wherein a type of the random access is a first type of random access, a triggering mode of the random access is triggering by a physical downlink control channel (PDCCH) order, the offset is used by the terminal device to determine a random access occasion in a physical random access channel (PRACH) resource according to a last symbol of the PDCCH order and the offset, wherein a time interval between the last symbol of the PDCCH order and a first symbol of the random access occasion is greater than a duration corresponding to the offset.
21. The network device according to claim 20 , wherein when the processor is used to run the computer program, the processor is further configured to:
transmit a configuration message carrying the offset to the terminal device.
22. The network device according to claim 21 , wherein the configuration message comprises at least one of the following:
a system broadcast message;
a PDCCH signaling;
a radio resource control signaling; and
a media access control control element signaling.