Abstract: When transmitting a user message, in a call setting period of a base station and a terminal and a radio connection state between a base station and a terminal, whenever a data transmittable channel resource is available, user messages of an amount corresponding to the available channel resource are transmitted. Therefore, user messages can be divided and transmitted according to an available channel in a call setting period.

Abstract: When a terminal moves from a serving cell to a target cell, the carrier in use is switched to the primary carrier of the serving cell and then handed over to the target cell. Hereupon, handover is performed by switching the carrier used by the terminal operating with the primary carrier of the serving cell to the primary carrier of the target cell to perform handover. When the terminal has fully entered the target cell, the best carrier is selected from among the carriers available to the target cell, thus allowing the terminal to perform frequency conversion to the best carrier.

Abstract: Provided is an enhanced communication apparatus. The enhanced communication apparatus may enable a Packet Data Convergence Protocol (PDCP) layer unit to perform a part of a concatenation function, a segmentation function, and a reassembly function of a Radio Link Control (RLC) layer unit that is a sublayer of Layer 2, and may decrease a number of Packet Data Convergence Protocol Packet Data Units (PDCP PDUs) to be processed by the RLC layer unit.

Abstract: A cell search method for a terminal capable of cell search control includes: receiving a message including first cell search information from a macro cell base station that manages a macro cell; updating second cell search information stored in the terminal based on the first cell search information; and searching for an accessible cell based on the updated second cell search information.

Abstract: Provided is a method of reducing power consumption of a base station. A method of operating a base station with low power consumption in a mobile communication system includes: reporting status information about a level of traffic being served by a base station in an active mode to an apparatus for managing power consumption of the base station; and switching from the active mode to an inactive mode in response to a mode change command from the apparatus.

Abstract: A handover method and apparatus for a mobile terminal using location information in a network of heterogeneous systems are provided. The handover method uses service area map information provided by a location service server in a mobile communication network in which at least one or more heterogeneous wireless network systems are connected through a predetermined network and, includes: receiving service area map information transmitted from the location service server; the mobile terminal determining whether or not the location of the mobile terminal is within the service area map; and if it is determined that the mobile terminal is within the service area map, the wireless terminal selecting an accessible wireless network system and then activating a unit for communicating with a base station of the selected wireless network system.

Abstract: A mobile communication system structured in a radio access network having a base station, a control station, and a switch network for matching a mobile station and a core network, the control station comprising a traffic signal process; a control signal processor; a call process load controller; and a call processor, wherein the call process load controller refers to information on call process volume included in a call process volume request message sent from the call processor and the traffic signal processor, selects the corresponding call processor and traffic signal processor according to weight estimated based on software and hardware performance, and sends the call control service request message containing information on the selected traffic signal processor to the selected call processor.

Abstract: Provided is a method of causing a mobile terminal to access an optimal access network using an access gateway. By searching for neighboring access network nodes periodically to select an optimal access network node when the mobile terminal accesses a serving access network node or when the mobile terminal performs handover, and accessing the selected optimal access network node through the access gateway to communicate with the optimal access network, it is possible to reduce communication costs and provide high-quality communication services to users without installing any additional apparatus require for heterogeneous networking. Furthermore, by performing authentication, registration, and QoS control in advance before accessing the optimal access network node, it is possible to reduce a time consumed to access the optimal access network node.

Abstract: A method for performing a handover includes: (a) a wireless network controller receiving a handover request message from the mobile station; (b) during an acknowledgement of the handover of the mobile station after receiving the handover request message, the wireless network controller generating a TCP proxy and converting a terminal connection TCP to a split connection TCP; (c) the TCP proxy acknowledging the reception of a packet from the server during the handover on behalf of the mobile station; (d) the TCP proxy storing a packet received from the server in a cache; and (e) upon receiving a handover registration message, the wireless network controller transmitting the packet stored in the cache to the mobile station.

Abstract: An access network selection system and method using a fuzzy multi-criteria decision making method under a heterogeneous network system are provided. With such a system and method, a subscriber selectively accesses an access network having advantageous communication quality and cost according to transmission environment and service characteristics so that mobility capability is increased due to effective utilization of radio resources and traffic division of heterogeneous access networks. In addition, an optimum access network can be selected using a membership function and a decision making function evaluating access network selection parameters for multi criteria decision-making. Therefore, the access network selection method using fuzzy multi-criteria decision making can ensure mobility and access network options for a subscriber and ensure effective management of a wireless infrastructure resource to a provider under a heterogeneous network environment.

Abstract: The present invention relates to an internet protocol (IP) mobile communication system and a session initiation method thereof. In the IP mobile communication system, a session initiation process using a session initiation protocol is performed for real-time mobile multimedia communication. At this time, not only multimedia codec but also session and quality of service (QoS) information is negotiated from a transmitting terminal to a receiving terminal, and is negotiated between relating network elements. An access manager controls a mobile access router which is a gateway of an access network according to the negotiated session and QoS information. Therefore an additional QoS negotiation process is not necessary for a session guaranteeing the QoS between a terminal and the mobile access router, between the mobile access routers, and between the mobile access router and the receiving terminal.

Abstract: A method for performing a handover includes: (a) a wireless network controller receiving a handover request message from the mobile station; (b) during an acknowledgement of the handover of the mobile station after receiving the handover request message, the wireless network controller generating a TCP proxy and converting a terminal connection TCP to a split connection TCP; (c) the TCP proxy acknowledging the reception of a packet from the server during the handover on behalf of the mobile station; (d) the TCP proxy storing a packet received from the server in a cache; and (e) upon receiving a handover registration message, the wireless network controller transmitting the packet stored in the cache to the mobile station.