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1- Initial access from RRC_IDLE;
2- RRC Connection Re-establishment procedure;
3- DL or UL data arrival during RRC_CONNECTED when UL synchronisation status is “non-synchronised”;
4- UL data arrival during RRC_CONNECTED when there are no PUCCH resources for SR available;
5- SR failure;
6- Request by RRC upon synchronous reconfiguration (e.g. handover);
7- RRC Connection Resume procedure from RRC_INACTIVE;
8- To establish time alignment for a secondary TAG;9.2.6
9- Request for Other SI (see clause 7.3);
10- Beam failure recovery;
11- Consistent UL LBT failure on SpCell.
12- SDT in RRC_INACTIVE (see clause 18);
13- Positioning purpose during RRC_CONNECTED requiring random access procedure, e.g., when timing advance is needed for UE positioning.
—38300 9.2.6
a.初始RRC接入
b.RRC连接重建
c.当UE从非激活态转移到激活态时
d.当切换失败时
e.上行失步且有上行数据需要传输----重同步
f.订阅其他ODOSI,MSG3方式基于竞争的RA
a.切换
b.上行失步且有下行数据需要传输时----重同步
c.订阅其他ODOSI,MSG1方式基于非竞争的RA(msg1一般是下发的)
d.波束失败恢复
--------38321 5.1.1
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