Random access method, user equipment, base station, storage medium, and electronic device

1. A random access method, comprising:

in a random access process, sending a first message to a base station by using a first resource;

receiving a second message sent by the base station, wherein the second message carries indication information of a second resource;

the method further comprises:

when Listen Before Talk (LBT) fails, indicating, by a lower layer, LBT failure to a Media Access Control (MAC); and

after receiving indication for the LBT failure, in a case where a Random Access Response (RAR) window is not started yet, initiating, by the MAC, a next random access process.

2. The method as claimed in claim 1 , wherein sending the first message to the base station by using the first resource comprises:

sending a preamble to the base station by using the first resource.

3. The method as claimed in claim 1 , wherein receiving the second message sent by the base station comprises one of the following:

receiving a Media Access Control (MAC) Random Access Response (RAR) sent by the base station; and

receiving a Time Advance (TA), a Temporary Cell Radio Network Temporary Identifier (TC-RNTI), and a contention resolution sent by the base station.

4. The method as claimed in claim 1 , wherein the second message carries a resource location of the second resource and a resource identifier of the second resource.

5. The method as claimed in claim 1 , after receiving the second message sent by the base station, further comprising:

sending a third message to the base station by using the second resource.

6. The method as claimed in claim 5 , wherein when the third message is Msg3, sending the third message to the base station by using the second resource comprises:

sending the Msg3 based on a result of performing LBT on the second resource, and in a case of LBT success, sending the Msg3 repeatedly;

wherein a maximum number of repetitions of sending the Msg3 is carried in the second message.

7. The method as claimed in claim 6 , wherein the maximum number of repetitions is configured or carried based on at least one of the following: a system message, a retransmission grant for the Msg3, and an MAC RAR.

8. User Equipment, UE, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform the method as claimed in claim 1 .

9. The method as claimed in claim 1 , wherein before sending the first message to a base station by using the first resource, the method further comprises:

selecting a first resource from multiple radio resources, wherein the radio resources comprise either or a combination of: Band Width Parts (BWPs) and carrier resources.

10. The method as claimed in claim 9 , wherein selecting the first resource from the multiple radio resources comprises at least one of the following:

selecting at least one first BWP from multiple BWPs;

selecting at least one first carrier from multiple carrier resources.

11. The method as claimed in claim 1 , wherein selecting the at least one first BWP from the multiple BWPs comprises:

selecting the at least one first BWP from the multiple BWPs based on at least one of the following: a BWP selection threshold, a BWP load, and a Listen Before Talk (LBT) count value, wherein the LBT count value is used for indicating a success rate of LBT or a failure rate of LBT;

or,

selecting the at least one first carrier from the multiple carrier resources comprises:

selecting the at least one first carrier from the multiple carrier resources based on at least one of the following: a carrier selection threshold, a carrier load, a success rate of LBT, and a failure rate of LBT.

12. A random access method, comprising:

in a random access process of User Equipment (UE), receiving a first message sent by the UE;

generating a second message;

sending the second message to the UE by using a third resource, wherein the second message carries indication information of a second resource;

the method further comprises:

when Listen Before Talk (LBT) fails, indicating, by a lower layer, LBT failure to a Media Access Control (MAC); and

after receiving indication for the LBT failure, in a case where a Random Access Response (RAR) window is not started yet, initiating, by the MAC, a next random access process.

13. The method as claimed in claim 12 , before generating the second message, further comprising one of the following:

selecting the second resource from multiple radio resources;

indicating to the UE that the second resource is a same resource as a resource used for sending the first message, wherein the same resource is a resource, at least one of resource location and resource number of which is the same or different, in a same Uplink (UL) BWP;

wherein the second resource is used for the UE to send a third message.

14. The method as claimed in claim 12 , wherein the second resource is used for the UE to send the third message; when the third message is Msg3, the method further comprises:

configuring a maximum number of repetitions of the Msg3 by one of the following: a system message, a Media Access Control (MAC) Random Access Response (RAR) and a retransmission grant of the Msg3, wherein the maximum number of repetitions is used to indicate the maximum number of times that the UE sends the Msg3 repeatedly.

15. A base station, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform the method as claimed in claim 12 .

16. The method as claimed in claim 12 , wherein before sending the second message to the UE by using the third resource, the method further comprises:

selecting the third resource from multiple radio resources, wherein the radio resources comprise either or a combination of: Band Width Parts (BWPs) and carrier resources.

17. The method as claimed in claim 16 , wherein selecting the third resource from the multiple radio resources comprises at least one of the following:

selecting at least one third BWP from multiple BWPs;

selecting at least one third carrier from multiple carrier resources.

18. The method as claimed in claim 17 , wherein selecting the at least one third BWP from the multiple BWPs comprises:

selecting the at least one third BWP from the multiple BWPs based on at least one of the following: a BWP selection threshold, a BWP load, and a Listen Before Talk (LBT) count value, wherein the LBT count value is used for indicating a success rate of LBT or a failure rate of LBT;

or,

selecting the at least one third carrier from the multiple carrier resources comprises:

selecting the at least one third carrier from the multiple carrier resources based on at least one of the following: a carrier selection threshold, a carrier load, a success rate of LBT, and a failure rate of LBT.

19. A non-transitory computer-readable storage medium, storing a computer program, wherein the computer program is configured to perform, when running, the method as claimed in claim 1 .