Abstract: A portable multimedia device for displaying a document having multiple pages. The portable multimedia device comprises a memory for storing the document; at least one display screen for displaying the document; and a central control unit for reading the document from the memory and displaying the document on the at least one display screen according to an operating mode selected by a user, wherein the central control unit comprises a page indicator display module for displaying page indicators, indicating current, previous, and next pages of the document, to be selected by the user, and a target page select module for displaying on the at least one display screen a target page that corresponds to one of the page indicators [finally] selected by the user. Accordingly, with the portable multimedia device, the user may easily spot a desired page of the document and may turn over pages to the desired page.

Abstract: A method and apparatus for providing a bi-directional communication in a mobile communication system by a Code Division Duplexing. In the Code Division Duplexing, the data to be transmitted is incorporated with unique codes having an orthogonal property to designate a forward and reverse direction communication, thereby allowing a bi-directional communication. Because the data can be efficiently transmitted through one channel, the Code Division Duplexing can provide a bi-directional communication for low tier bandwidth channels such as private and ISM communication systems.

Abstract: A system and method for transmitting packet data in a communications system assigns an IP address to a terminal based on a network access identifier corresponding to the terminal, and then sends packet data to the terminal using the IP address. The terminal may be a simple IP user terminal or a mobile IP user terminal, and the packet data being sent preferably corresponds to an IP push service. In order to send the packet data, a protocol link is established between the terminal and network. Transmission of packet data on this link may be managed using an information table which relates information corresponding to the IP address to the network access identifier. This table is updated with information relating to the IP address when, for example, the network access identifier changes, when a point-to-point protocol timer expires, when an IP registration expires a location of the terminal changes.

Abstract: A method for multicasting/broadcasting IP data in a mobile communication system, includes the steps of a packet data serving node (PDSN) receiving multicast packet data, transforming the multicast packet data to a PPP frame format having an identification header, transmitting multicast message to base station controller/packet control function (BSC/PCF), the BSC/PCF transmitting multicasting/broadcasting message to all or some of base stations under control of the BSC/PCF according to header information of the multicast message, and transmitting the multicasting/broadcasting message to mobile station through broadcasting channel.

Abstract: A method for serving a packet dormant handoff is disclosed, including determining with a mobile switching center whether a mobile station performs a dormant handoff into an area of a destination base station controller/packet controller function (BSC/PCF) and providing information of the dormant handoff from the mobile switching center to an original BSC/PCF, when the mobile station performs the dormant handoff.

Abstract: A hand-off notifying and controlling system of a mobile node is disclosed including a mobile node (MN) that transmits a registration request message. An old foreign agent (FA) provides a mobile IP service to the MN, before the hand-off takes place. A new FA provides a mobile IP service to the MN, after the hand-off takes place. A home agent (HA) generates and transmits a registration release message to the old FA, upon receipt of the registration request message from the MN via the new FA. When the MN is handed off, since the HA deletes the previous registration of the MN, registered in the old FA, the waste of memory resources and registration lock dead can be simply and effectively reduce or solved.

Abstract: Disclosed is a method of realizing a link access control protocol for IP M/B packet transmission in a mobile communication network. The method of the invention comprises the steps of: receiving by an LAC of a BTS/BSC an Internet IP M/B packet transferred via a BSC/PCF from an Internet host and a multicasting server, storing the Internet IP M/B packet into an internal buffer, and segmenting the Internet IP M/B packet into a radio packet frame size; adding sequence numbers to the segmented radio packet frames and transmitting a CIBP SDU into a mobile terminal; and assembling, in the mobile terminal, the CIBP SDU for the received radio packet frames and forming the IP M/B packet, and transferring the formed IP M/B packet into an upper layer.

Abstract: A data control system in a CDMA mobile communication system can achieve data communication with a public network subscriber, even if a modem is not mounted on a computer of a mobile telephone subscriber, and simultaneously minimize data transmission error rate even in an irregular environment of radio data transmitting/receiving sections between a mobile telephone and a radio base station.

Abstract: A transmission method and system that receive packet data destined to multiple subscribers served by a base station controller/packet control function (BSC/PCF) with the BSC/PCF, transmit the packet data from the BSC/PCF to a number of base stations, which provide service to the subscribers, using a single communication link between the BCS/PCF and each of the number of base stations, and transmit the packet data from the number of base stations to the subscribers.

Abstract: 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.

Abstract: Architecture of a mobile communication system network and method for transmitting a packet data using the same, which can minimize required signal links and interlocking lines, the architecture including a plurality of radio network controllers each connected to a plurality of base stations in a cell or a sector to which the network controller pertains for separating a packet data service path from a circuit data service path when a particular mobile station is matched to this core network, at least one mobile switching center connected to the plurality of radio network controllers in a region of the mobile switching center by an ATM switching system for routing an originating call from the mobile station or a terminating call to the mobile station, a VLR/HLR(Visitor location register/home location register) connected to the mobile switching center for managing mobility of the mobile stations, and at least one PDGN(Packet data gateway node) for routing a packet data provided from either the mobile switching c

Abstract: A cellular asynchronous transfer mode packet network and a method for transferring packet data in the same is disclosed. A virtual circuit is established between a serving radio network controller and a target radio network controller, or between the serving radio network controller and a target packet data node. Also, individual packet paths are established between the serving radio network controller and the target radio network controller or between the serving radio network controller and the target packet data node through a mobile packet router. Individual data blocks of the packet data or packet sessions are multiplexed/demultiplexed over the virtual circuit on the basis of a service specific convergence sub-layer protocol. The multiplexed/demultiplexed data blocks are routed according to authenticated destination identifiers.

Abstract: A packet data service system and operating method thereof in a mobile radio communication network is provided, which can support link mobility by maintaining a data connection between a mobile station and an initially connected interworking function device when a mobile packet data service is provided in the environment of a mobile radio communication network of cellular/PCS/IMT-2000. The packet data service system includes a packet router for providing originating or terminating traffic paths for a plurality of mobile stations and managing particulars of an event whenever the event is produced in the mobile stations, and an interworking function device for controlling the packet router to interwork with another network.

Abstract: Mobile Internet system and method in a mobile communication network is disclosed, in which a mobile host given an Internet Protocol address uses an existing Code Division Multiple Access type mobile network and an Home Location Register and an Inter-Working Unit in a personal communication system network to establish communications without restricting a mobile host to a particular network. The mobile Internet system and method includes a plurality of mobile hosts, a plurality of mobile access points, a mobile router, and a plurality of gateway routers.

Abstract: A packet data network for providing a radio packet data service in a mobile radio communication system. The packet data network includes a plurality of radio network controllers (RNCs) for controlling a radio channel allocation to a mobile station and for controlling, matching the network, a path of a packet data service or a circuit data service; a plurality of packet data gateway nodes (PDGNs) for performing management of a mobility of the mobile station and a routing function of packet data for information management; a mobile switching center (MSC) for registering and managing terminal node identifiers of the RNCs and the PDGNs connected to the mobile switching center, and for managing and giving to the PDGNs network identification addresses which a user can directly call; and a packet router for providing a packet data transmission path by routing a packet data between the RNC and PDGN, if a mobile station requests the packet data service.

Abstract: A system and method for transmitting packet data in a communications system assigns an IP address to a terminal based on a network access identifier corresponding to the terminal, and then sends packet data to the terminal using the IP address. The terminal may be a simple IP user terminal or a mobile IP user terminal, and the packet data being sent preferably corresponds to an IP push service. In order to send the packet data, a protocol link is established between the terminal and network. Transmission of packet data on this link may be managed using an information table which relates information corresponding to the IP address to the network access identifier. This table is updated with information relating to the IP address when, for example, the network access identifier changes, when a point-to-point protocol timer expires, when an IP registration expires a location of the terminal changes.

Abstract: A hand-off notifying and controlling system of a mobile node is disclosed including a mobile node (MN) that transmits a registration request message. An old foreign agent (FA) provides a mobile IP service to the MN, before the hand-off takes place. A new FA provides a mobile IP service to the MN, after the hand-off takes place. A home agent (HA) generates and transmits a registration release message to the old FA, upon receipt of the registration request message from the MN via the new FA. When the MN is handed off, since the HA deletes the previous registration of the MN, registered in the old FA, the waste of memory resources and registration lock dead can be simply and effectively reduce or solved.

Abstract: Disclosed is a method of realizing a link access control protocol for IP M/B packet transmission in a mobile communication network. The method of the invention comprises the steps of: receiving by an LAC of a BTS/BSC an Internet IP M/B packet transferred via a BSC/PCF from an Internet host and a multicasting server, storing the Internet IP M/B packet into an internal buffer, and segmenting the Internet IP M/B packet into a radio packet frame size; adding sequence numbers to the segmented radio packet frames and transmitting a CIBP SDU into a mobile terminal; and assembling, in the mobile terminal, the CIBP SDU for the received radio packet frames and forming the IP M/B packet, and transferring the formed IP M/B packet into an upper layer.

Abstract: A radio packet data terminal and a method of determining an Internet interworking protocol address which can easily provide a mobile Internet protocol service and a mobile Internet service by adding a packet data service option and an Internet protocol address option to an originating message to be transmitted to a base transceiver station or by adding information on the system address for interworking packet data to be connected, the present state of the packet data connection, the purpose of the packet data service connection, etc., to the originating message, when the radio packet data service for connecting with Internet is requested.

Abstract: A method for multicasting/broadcasting IP data in a mobile communication system, includes the steps of a packet data serving node (PDSN) receiving multicast packet data, transforming the multicast packet data to a PPP frame format having an identification header, transmitting multicast message to base station controller/packet control function (BSC/PCF), the BSC/PCF transmitting multicasting/broadcasting message to all or some of base stations under control of the BSC/PCF according to header information of the multicast message, and transmitting the multicasting/broadcasting message to mobile station through broadcasting channel.