Samsung Electronics Co., Ltd.

Ki-Hyun Do

Yong-Duk Cho

Tae-Hee Lee

Jin-Young Oh

Tu K Nguyen

Jung-Woo Park

Jong-Han Kim

Ju-Yeop Kim

In-yup Kang

Dong-hyun Choi

Jeong-Gyun Yu

Vijayant Kumar

Prashant Ashok Chitare

Disclosed is a method for controlling a security mode by a user equipment (UE) in a wireless communication system, including performing a camp-on process and a cell update process with a network when an out-of-service (OOS) situation has occurred, receiving one of a signaling connection release (SCR) message and a first protocol data unit (PDU) which corresponds to the SCR message from the network, receiving a security mode command (SMC) message from the network if the SCR message is received, performing an integrity process on the SCR message using an old security configuration, and performing a rollback process to discard a new security configuration included in the SMC message if a result of the integrity process result an integrity check success, and updating a security configuration to the old security configuration.

Apparatus and method for controlling security mode in wireless communication system

Methods and apparatuses are provided for cell reselection at a mobile terminal. A first cell measurement is performed with respect to a serving cell and a first set of one or more cells included in a neighbor cell list. A second cell measurement is performed to detect a second set of one or more cells that are not included in the neighbor cell list, based on the first cell measurement. One or more candidate cells that satisfy cell reselection criteria are determined from among the first set of one or more cells and the second set of one or more cells. One of the one or more candidate cells is reselected.

Mobile terminal for cell reselection in cellular mobile communication system and methods therefor

A method for operating of a terminal in a communication system is provided. The method includes receiving first information for cell reselection, reconfiguring an expiration time of a cycle of a timer of the terminal based on the received first information for cell reselection, and determining second information for cell reselection at the reconfigured expiration time of the cycle of the timer of the terminal for cell reselection.

Apparatus and method for controlling cell reselection timer in communication system

An apparatus and a method for switching a Radio Access Technology (RAT) by a User Equipment (UE) in a wireless communication system are provided. The method includes detecting an event indicating that the UE should perform a switching operation from a first RAT to a second RAT different from the first RAT occurs while the UE uses the first RAT determining whether a RAT switching operation criterion is satisfied after detecting that the event occurs and if the RAT switching operation criterion is satisfied, performing the switching operation.

Apparatus and method for switching radio access technology in wireless communication system

A mobile communication system and method for processing an unrecoverable error of a terminal are provided. In the method a Radio Resource Control (RRC) layer receives a downlink reset message from a network, determines whether the RRC layer receives an unrecoverable error report from a Radio Link Control (RLC) layer during a downlink reset; transmits an uplink response message to the network, when the downlink reset is completed; determines whether an unrecoverable error ignore condition is met, when the RRC layer receives the unrecoverable error report; and ignores the unrecoverable error when the unrecoverable error ignore condition is met. The RLC layer then performs data transmission and reception.

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Gyeonggi-do, South Korea

Ki-Hyun Do