Patent ID: 11943611
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: nan (nan)
Classification: CPC nan | IPC H

Claim 12:
13. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller configured to:
transmit, via the transceiver to a terminal, a counter check message for at least one data radio bearer (DRB) including first information, the first information including an identity of a DRB and a first count value associated with the DRB; and
receive, via the transceiver from the terminal as a response to the counter check message, a counter check response message including second information,

wherein, in case that a most significant bits of a second count value of the terminal associated with the DRB is different from a most significant bits of the first count value associated with the DRB, the second information includes the identity of the DRB and the second count value of the terminal associated with the DRB,
wherein, in case that the first count value associated with the DRB and the second count value of the terminal associated with the DRB are for uplink, the second count value of the terminal associated with the DRB is set to a value of TX_NEXT-1,
wherein, in case that the first count value associated with the DRB and the second count value of the terminal associated with the DRB are for downlink, the second count value of the terminal associated with the DRB is set to a value of RX_NEXT-1, and
wherein the TX_NEXT is a count value of a next packet data convergence protocol (PDCP) service data unit (SDU) to be transmitted and the RX_NEXT is a count value of a next PDCP SDU expected to be received.