| Patent application number | Description | Published |
|---|
| 20090186601 | PRE-AUTHENTICATION METHOD FOR INTER-RAT HANDOVER - A pre-authentication method for an Inter-RAT handover is disclosed. This pre-authentication method relates to a wireless access system, and provides a method for performing pre-authentication in case of an inter-RAT handover managed by different administrative domains. The method for performing pre-authentication before a handover in order to quickly perform an Inter-Radio Access Technology (Inter-RAT) handover, includes, transmitting a message having terminal information needed for the pre-authentication to a target authentication server, receiving security-associated information of a target network from the target authentication server, wherein the target network security-associated information is generated by the mobile terminal information, and generating security-associated information, which will be used by the mobile terminal in the target network, using the security-associated information of the target network, and performing the pre-authentication. | 07-23-2009 |
| 20090307496 | METHOD OF DERIVING AND UPDATING TRAFFIC ENCRYPTION KEY - A method for efficiently deriving a traffic encryption key for data encryption is disclosed. A method of generating a traffic encryption key (TEK) comprises the steps of receiving, by a mobile station from base station, a first nonce and first security materials for deriving the traffic encryption key (TEK) and deriving the traffic encryption key (TEK) using one or more of the first nonce, the authentication key (AK), and the first security materials. | 12-10-2009 |
| 20100004002 | METHOD OF PROVIDING LOCATION PRIVACY - A method of providing location privacy of a mobile station in a wireless access system is disclosed. The method of providing location privacy of a mobile station comprises the steps of transmitting a deregistration request message to a serving base station, the deregistration message requesting entry to an idle mode; and receiving a deregistration command message from the serving base station, the deregistration command message including a temporary identifier allocated to the mobile station. In this case, the temporary identifier is an identifier for uniquely identifying the mobile station from a paging group to which the serving base station belongs. | 01-07-2010 |
| 20100015951 | METHOD OF SUPPORTING LOCATION PRIVACY - A method of protecting location privacy of a mobile station when the mobile station enters a network is disclosed. A method of supporting location privacy comprises the steps of transmitting a ranging code for performing initial ranging; and receiving a message including temporary station identifier after transmitting a ranging request message including MAC address of a mobile station. In this case, the temporary station identifier is used to provide security of a media access control (MAC) address or mapping information of the MAC address and station identifier, wherein the MAC address is to identify a mobile station within a base station. | 01-21-2010 |
| 20100135210 | METHOD OF RANDOM ACCESS AND A METHOD OF TRANSPORTING INFORMATION IN BROADBAND WIRELESS ACCESS SYSTEM - A method of performing random access in a broadband wireless access system is disclosed. The method includes performing first random access through at least one of a plurality of random access channels, receiving information about the number of access-failed channels among the plurality of random access channels from a base station, when the first random access fails, and performing second random access according to a probability value calculated based on the received information. The present invention increases utilization of random access channels and can effectively schedule an uplink bandwidth, thereby providing an efficient ranging method. | 06-03-2010 |
| 20100208695 | METHOD FOR PERFORMING BAND HANDOVER IN BROADBAND WIRELESS ACCESS SYSTEM AND MOBILE STATION SUPPORTING THE SAME - A method for performing band handover in a broadband wireless access system is provided. In this method, a terminal in a band AMC mode in which the terminal transmits and receives data through a band selected from among bands to which a modulation scheme and a coding rate are adaptively applied receives channel status information of each band of a neighboring base station. The terminal then performs handover to the neighboring base station while maintaining the band AMC mode if it is determined based on the received channel status information that a channel status of each band of the neighboring base station satisfies a predetermined condition. This band handover method enables handover to be performed for each specific frequency band of a mobile terminal. | 08-19-2010 |
| 20100208696 | METHOD OF FAST UPLINK DATA TRANSMISSION FOR HANDOVER - A fast uplink data transmission method for a handover is disclosed. This method effectively uses a handover signal when there is data to be transmitted to an uplink during an Intra Radio Access Technology (I-RAT) handover, such that it quickly transmits and receives uplink data. The method of transmitting uplink data in a wireless access system includes, transmitting a message including an information bit to a target base station by a mobile station during a handover, wherein the information bit indicates whether the uplink data is present, and receiving a radio resource for transmitting the uplink data from the target base station, if the information bit indicates the uplink data is present, wherein the radio resource is allocated by the target base station. So, uplink user data can be quickly transmitted to a destination while the UE performs the handover. | 08-19-2010 |
| 20100215020 | METHOD OF PACKET REORDERING AND PACKET RETRANSMISSION - A packet reordering method and a packet transmission method to implement reliable data communication are disclosed. The method of transmitting packets at a serving base station in case of a mobile station performing handover include, receiving a series of packets from an upper layer entity, and transmitting the series of packets one after the other to a target base station, wherein a packet of the series of packets includes an information field which represents whether the packet is the last transmitted packet. When the mobile station performs the I-RAT handover, the target serving station pre-reorders PDU packets, and transmits the reordered PDU packets to the mobile station, such that the mobile station can quickly transmit data without reordering the packets. | 08-26-2010 |
| 20100228967 | METHOD OF ESTABLISHING SECURITY ASSOCIATION IN INTER-RAT HANDOVER - A method of establishing security association during handover between heterogeneous networks in a radio access system is disclosed. A method of establishing security association before handover with a target base station included in a heterogeneous radio access network is performed comprises transmitting a request message to a service base station, the request message requesting the service base station to transfer authentication related information of a mobile station to a target network authentication server; and receiving a response message from the service base station before the handover with the target base station is performed, the response message including security related information used in a target network. | 09-09-2010 |
