Method for random access, terminal, and storage medium
A method for random access, including: executing at least one of switching beams or switching coverage enhancement levels, for a random access attempt based on a preset switching strategy.
1. A method for random access, comprising:
determining a coverage enhancement level on a beam for the random access attempt and a random access parameter corresponding to the coverage enhancement level based on a signal strength of a measured beam;
switching the coverage enhancement level based on a preset switching strategy; and
performing a random access attempt based on the random access parameter corresponding to the coverage enhancement level.
2. The method as claimed in claim 1 , further comprising:
in response to a failure of a random access attempt based on a given coverage enhancement level on a beam, switching to a next coverage enhancement level for the random access attempt.
3. The method as claimed in claim 1 , wherein determining the coverage enhancement level on the beam for the random access attempt based on the signal strength of the measured beam comprises:
determining the coverage enhancement level based on a signal quality of a synchronization signal block (SSB) of the measured beam; or
determining the coverage enhancement level based on a signal quality of a channel-state information reference signal (CSI-RS) of the measured beam.
4. The method as claimed in claim 1 , wherein determining the coverage enhancement level on the beam for the random access attempt based on the signal strength of the measured beam comprises:
determining the coverage enhancement level by comparing the signal strength with thresholds configured by a network device for dividing coverage enhancement levels.
5. The method as claimed in claim 1 , wherein the random access parameter corresponding to the coverage enhancement level comprises at least one of:
a repetition number of transmissions comprised in one random access attempt corresponding to the coverage enhancement level;
a number of random access attempts on one beam, corresponding to the coverage enhancement level; or
a default value of a number of random access attempts on one beam, corresponding to the coverage enhancement level.
6. The method as claimed in claim 1 , further comprising:
determining a maximum coverage enhancement level on a selected beam based on a threshold of selecting the beam for the random access attempt.
7. The method as claimed in claim 1 , further comprising at least one of:
switching beams for the random access attempt in response to determining that a current coverage enhancement level on a beam reaches a maximum coverage enhancement level of the beam;
switching beams for the random access attempt in response to determining that a number of random access attempts on a beam reaches a maximum number of random access attempts of the beam;
in response to a failure of a random access attempt on a current beam, switching to a next beam for the random access attempt based on a beam priority switching strategy; or
in response to failures of random access attempts based on a coverage enhancement level on all beams, switching to a next coverage enhancement level for the random access attempt.
8. A terminal, comprising:
a memory; and
a processor, respectively connected to the memory, configured to, by executing computer-executable instructions stored on the memory, perform:
determining a coverage enhancement level on a beam for the random access attempt and a random access parameter corresponding to the coverage enhancement level based on a signal strength of a measured beam;
switching the coverage enhancement level based on a preset switching strategy; and
performing a random access attempt based on the random access parameter corresponding to the coverage enhancement level.
9. A non-transitory computer-readable storage medium having stored therein computer-executable instructions that, when executed by a processor, a method for random access is performed, the method comprising:
determining a coverage enhancement level on a beam for the random access attempt and a random access parameter corresponding to the coverage enhancement level based on a signal strength of a measured beam;
switching the coverage enhancement level based on a preset switching strategy; and
performing a random access attempt based on the random access parameter corresponding to the coverage enhancement level.
10. The terminal as claimed in claim 8 , wherein the processor is further configured to perform:
in response to a failure of a random access attempt based on a given coverage enhancement level on a beam, switching to a next coverage enhancement level for the random access attempt.
11. The terminal as claimed in claim 8 , wherein determining the coverage enhancement level on the beam for the random access attempt based on the signal strength of the measured beam comprises:
determining the coverage enhancement level by comparing the signal strength with thresholds configured by a network device for dividing coverage enhancement levels.
12. The method as claimed in claim 1 , wherein the signal strength comprises a Reference Signal Receiving Power (RSRP).
13. The method as claimed in claim 12 , wherein a threshold of the RSRP is configured to select some or all beams from a plurality of beams for random access attempts of the terminal.
14. The method as claimed in claim 5 , wherein the repetition number of transmissions comprised in one random access attempt corresponding to the coverage enhancement level is N, where N is a positive integer, and the repetition number N of transmissions represents one of:
N random access requests transmitted in one random access attempt;
N random access requests transmitted continuously in one random access attempt;
N transmission time lengths for which a random access preamble is transmitted continuously in one random access attempt; or
N subframes where the random access preamble is carried and transmitted continuously in one random access attempt.
15. The method as claimed in claim 5 , further comprising:
performing the random access attempt based on a number of random access attempts corresponding to a coverage level comprised in the random access parameter corresponding to the coverage enhancement level.
16. The terminal as claimed in claim 8 , wherein the signal strength comprises a Reference Signal Receiving Power (RSRP).
17. The terminal as claimed in claim 16 , wherein a threshold of the RSRP is configured to select a part of or all of beams for the random access attempt of the terminal from a plurality of beams.
18. The terminal as claimed in claim 8 , wherein the random access parameter corresponding to the coverage enhancement level comprises at least one of:
a repetition number of transmissions comprised in one random access attempt corresponding to the coverage enhancement level;
a number of random access attempts on one beam, corresponding to the coverage enhancement level; or
a default value of a number of random access attempts on one beam, corresponding to the coverage enhancement level.
19. The terminal as claimed in claim 18 , wherein the repetition number of transmissions comprised in one random access attempt corresponding to the coverage enhancement level is N, where N is a positive integer, and the repetition number N of transmissions represents any of:
N random access requests transmitted in one random access attempt;
N random access requests transmitted continuously in one random access attempt;
N transmission time lengths for which a random access preamble is transmitted continuously in one random access attempt; or
N subframes where the random access preamble is carried and transmitted continuously in one random access attempt.
20. The terminal as claimed in claim 18 , wherein the processor is further configured to:
perform the random access attempt based on a number of random access attempts corresponding to a coverage level comprised in the random access parameter corresponding to the coverage enhancement level.