Method and device for conditionally adding and changing cell
摘要
說(shuō)明書
Thereafter, the terminal may perform a random access to a corresponding target cell (operation 7-60), and transmit an RRC message to the MN (operation 7-50). Operations 7-50 and 7-60 may be concurrently performed or sequentially performed, and the order of the two operations is not limited in this embodiment. A random access operation may include the operations of transmitting a random access preamble (MSG1 transmission), receiving a random access response from a target cell (MSG2 reception), transmitting an uplink signal, based on a UL grant included in the random access response (MSG3 transmission), and receiving a message including information on contention resolution from the target cell (MSG4 reception). When a non-contention type random access is performed, operations corresponding to MSG3 and MSG4 may be omitted. The RRC message may be an MN RRC reconfiguration complete message (a case of NR DC) or an MN RRC connection reconfiguration complete message (a case of EN DC), and the disclosure is not limited thereto. For example, when an RRC reconfiguration complete message is used, the terminal may transmit the corresponding message to the MN to notify the MN that a conditional PSCell is performed (operation 7-50). This notification may be transferred through srb1 (or split srb1). The RRC reconfiguration complete message (outer message) may include an SN RRCreconfigurationComplete message (inner message) of an SN, and the SN RRC reconfiguration complete message may use a transaction ID made by a T-SN of a target cell. Alternatively, the RRC reconfiguration complete message (outer message) may include an SN RRC reconfigurationcomplete message (inner message), and a conditional configuration ID associated with a target PSCell of conditional PSCell addition made by the MN.
