US 12,250,730 B2
Random access method and terminal
Yitao Mo, Dongguan (CN); and Yumin Wu, Dongguan (CN)
Assigned to VIVO MOBILE COMMUNICATION CO., LTD., Dongguan (CN)
Filed by VIVO MOBILE COMMUNICATION CO., LTD., Guangdong (CN)
Filed on Jul. 22, 2021, as Appl. No. 17/382,422.
Application 17/382,422 is a continuation of application No. PCT/CN2020/073774, filed on Jan. 22, 2020.
Claims priority of application No. 201910075298.5 (CN), filed on Jan. 25, 2019.
Prior Publication US 2021/0352741 A1, Nov. 11, 2021
Int. Cl. H04W 74/08 (2024.01); H04W 72/02 (2009.01); H04W 72/0453 (2023.01); H04W 72/54 (2023.01); H04W 74/0833 (2024.01)
CPC H04W 74/0841 (2013.01) [H04W 72/02 (2013.01); H04W 72/0453 (2013.01); H04W 72/54 (2023.01)] 20 Claims
OG exemplary drawing
 
1. A random access method, applied to a terminal side, comprising:
sending a random access request message through a target carrier; wherein the target carrier is one of a first type of uplink carrier and a second type of uplink carrier; and
before the sending the random access request message through the target carrier, the method further comprises:
in a case where a random access process corresponding to the random access request message is not completed, changing the target carrier if a preset change condition is met; wherein
the changing the target carrier if a preset change condition is met comprises:
in a case where the target carrier is the first type of uplink carrier, if the preset change condition is met, changing the target carrier from the first type of uplink carrier to the second type of uplink carrier; wherein the preset change condition comprises: a counter corresponding to the random access process is equal to a fourth threshold; and
before the changing the target carrier from the first type of uplink carrier to the second type of uplink carrier if the preset change condition is met, the method further comprises at least one of:
after completing an initial selection of the target carrier or completing a previous change of the target carrier, starting a timer corresponding to the random access process; or
after completing an initial selection of the target carrier or completing a previous change of the target carrier, setting the counter corresponding to the random access process; wherein
the counter is configured to record:
times of power ramping in the random access process.