Lg Electronics Inc.

Soongsil University

Lg Information & Communications, Ltd.

Young Sik Youn

Young Woo Yun

Young Jo Lee

Byung Keun Lim

Souhwan Jung

Hyung Uk Kwon

Nam Suk Kim

Seung Wook Jung

An RFID tag using a physically unclonable function (PUF) generates a response value corresponding to a challenge value, receives an RFID reader ID from an RFID reader, generates a first message authentication code for the RFID reader ID, an RFID tag ID and time information by using, as a secret key, a first response value corresponding to a first challenge value, and transmits, to the RFID reader, the first challenge value, the first message authentication code and the time information of the RFID tag, which are tag identification elements, when the RFID reader ID is received. At this time, the RFID tag shares, with an RFID tag authentication server, the same message authentication code generation function, the RFID tag ID, the first challenge value, and the first response value generated by a PUF module.

RFID tag authentication system

A system and method is provided for controlling a packet data service in a mobile communication network, in which, when a packet data service active terminal moves from an area of an old radio network controller to an area of a new radio network controller in either a suspended state or a dormant state, the same medium access control state information and the same radio resource control information are applied between the new radio network controller and the active terminal. Therefore, the packet data service can rapidly be resumed on the basis of an initially established point-to-point protocol link. If the active terminal moves from the old radio network controller to the new radio network controller under the condition that only a point-to-point protocol state is maintained between the active terminal and a packet data node, the active terminal detects a received pilot signal and checks a system overhead message. If the active terminal should perform a handoff operation in the suspended state, the active terminal requests the old radio network controller to permit its change to the dormant state or an active state.

System and method for controlling packet data service in mobile communication network

Method for performing a random access in a mobile communication system, including the steps of monitoring at base station a state of a reverse common channel, determining state information of the reverse common channel corresponding to a result of the monitoring using one slot allocated to a forward common channel, and transmitting the state information to respective mobile stations through the forward common channel, whereby improving a message transmission efficiency because one random access slot allocated to the forward common channel is used, not entirely, but partly, or the state information of the reverse common channel is transmitted repeatedly for a given times in a case when the base station transmits state information of the reverse common channel to all mobile stations within cells of sectors of its own.

Method for performing an enhanced random access using information of forward common channels in a mobile communication system

Method and apparatus for estimating power in CDMA system

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Seoul, South Korea

Young Sik Youn