Abstract
A user equipment (UE) stores layer 1/layer 2 triggered mobility (LTM) candidate configurations, each listing candidate secondary cells (SCells) with a short identifier unique within that candidate and the sCellIndex used in the candidate's RRC container. On receiving a cell switch command medium access control (MAC) control element, the UE derives the SCell activation bitmap length from the short identifiers configured for the target candidate, without a size indicator. It maps each set bit to an sCellIndex and activates the mapped SCell when that sCellIndex exists in the target configuration. The UE ignores a set bit without a valid mapping, activates the remaining SCells, and after the switch sends a mismatch indication listing the ignored short identifiers. The short identifier stays unchanged when sCellIndex values change, so early TCI-state activation is retained. A UE capability gates the format, with legacy sCellIndex addressing as fallback. Keywords: layer 1/layer 2 triggered mobility; LTM cell switch command; candidate SCell short identifier; SCell activation bitmap; MAC control element; carrier aggregation; sCellIndex mapping; SCell activation mismatch indication; target-derived bitmap length
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Recommended Citation
Anonymous, "Compact LTM-candidate-specific SCell identifier for addressing candidate SCells in the cell-switch command", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/12427