| CPC H04W 12/106 (2021.01) [H04W 12/03 (2021.01); H04W 12/0431 (2021.01); H04W 76/20 (2018.02)] | 5 Claims |
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1. A terminal apparatus that communicates with a base station apparatus, the terminal apparatus comprising:
a receiver configured to receive an RRC (Radio Resource Control) reconfiguration message from the base station apparatus; and
a processor, wherein
the processor is configured to:
establish a first PDCP (Packet Data Convergence Protocol) entity associated with a first DRB (Data Radio Bearer) and a second PDCP entity associated with a second DRB;
have the first PDCP entity apply a first ciphering algorithm, a first ciphering key, a first integrity protection algorithm, and a first integrity protection key; and
have the second PDCP entity apply the first ciphering algorithm, a second ciphering algorithm, the first ciphering key, a second ciphering key, the first integrity protection algorithm, a second integrity protection algorithm, the first integrity protection key, and a second integrity protection key,
the first DRB is a DRB for which a first request is not performed based on the RRC reconfiguration message,
the second DRB is a DRB for which the first request is performed based on the RRC reconfiguration message,
the first request is a request for performing a handover in which transmission or reception of user data in a target cell with continued transmission or reception of user data in a source cell is performed, and
the first request is applied for a radio bearer with which a PDCP entity is associated.
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