US Patent No. 10,694,377

METHOD AND APPARATUS FOR IDENTIFYING SECURITY KEY IN NEXT GENERATION MOBILE COMMUNICATION SYSTEM


Patent No. 10,694,377
Issue Date June 23, 2020
Title Method And Apparatus For Identifying Security Key In Next Generation Mobile Communication System
Inventorship Donggun Kim, Suwon-si (KR)
Soenghun Kim, Suwon-si (KR)
Assignee Samsung Electronics Co., Ltd., Suwon-si (KR)

Claim of US Patent No. 10,694,377

1. A method of a terminal in a wireless communication system, the method comprising:receiving, from a base station, a first message for checking one or more count values associated with one or more bearers, the first message including first information, the first information including a first identity of a first bearer, a first downlink count value associated with the first bearer and a first uplink count value associated with the first bearer; and
transmitting, to the base station, a second message as a response to the first message,
wherein in at least one case in which a most significant bits of a second downlink count value of the terminal associated with the first bearer is different from a most significant bits of the first downlink count value associated with the first bearer or a most significant bits of a second uplink count value of the terminal associated with the first bearer is different from a most significant bits of the first uplink count value associated with the first bearer, second information is included in the second message, the second information including the first identity of the first bearer, the second downlink count value of the terminal associated with the first bearer, and the second uplink count value of the terminal associated with the first bearer, the second downlink count value of the terminal associated with the first bearer being set to a value of TX_NEXT-1 and the second uplink count value of the terminal associated with the first bearer being set to a value of RX_NEXT-1,
wherein in case that a second identity of a second bearer established on the terminal is not included in the first message, third information is included in the second message, the third information including the second identity of the second bearer, a third downlink count value of the terminal associated with the second bearer, and a third uplink count value of the terminal associated with the second bearer, the third downlink count value of the terminal associated with the second bearer being set to a value of TX_NEXT-1 and the third uplink count value of the terminal associated with the second bearer being 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.