Abstract: An apparatus and method for Admission Control (AC) in a broadband wireless communication system are provided. The apparatus includes a classification unit for determining a Mobile Virtual Network Operator (MVNO), from a plurality of MVNOs, that provides services for a generated resource request, a manager for evaluating a resource occupation status of the MVNO and a resource amount permitted to the MVNO, and a determination unit for determining whether to admit the resource request according to at least one of the resource occupation status of the determined MVNO, the resource amount permitted to the determined MVNO and an available total resource amount.

Abstract: A scheduling apparatus and method for proportional resource allocation among Mobile Virtual Network Operators (MVNOs) are provided. The method includes, for each MVNO, allocating a dedicated resource of each MVNO to Quality of Service (QoS) traffic in consideration of priorities, for each MVNO, determining a presence or absence of unscheduled QoS traffic, and for MVNOs each of which has the unscheduled QoS traffic, allocating a common resource shared by all MVNOs to the unscheduled QoS traffic in consideration of priorities without distinguishing each MVNO. Accordingly, proportional resource allocation depending on a pre-set ratio can be guaranteed, efficiency of resource use can be improved, and QoS can be guaranteed.

Abstract: An apparatus and method for data transmission in a base station (BS) of a wireless communication system are provided, storing data to be transmitted to a mobile station which performing handover to a target base station; confirming a quantity of stored data; determining whether to transmit the stored data to the target based at least partly on the confirmed quantity of the stored data; transmitting the stored data to the target base station when the base station determines to transmit the stored data to the target base station.

Abstract: An apparatus and method for Connection Admission Control (CAC) in a Broadband Wireless Access (BWA) system are provided. In the method, a QoS class of a call requesting connection admission is detected and an application layer required bandwidth is determined using the QoS parameters of a service flow of the detected QoS class. A required bandwidth weight of the QoS class is determined in consideration of a packet header overhead. Per-slot available bandwidths of a reference QoS class and the QoS class are determined using the determined application layer required bandwidth, and a required bandwidth conversion ratio of a corresponding QoS class is determined using the determined per-slot available bandwidths. An equivalent MAC layer required bandwidth is determined using the determined application layer required bandwidth, the required bandwidth weight, and the required bandwidth conversion ratio.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: In a communication system, a token manager corresponding to a generated or arriving packet is determined, tokens corresponding to a target transmission rate limit are generated, and a corresponding packet is at least one of dropped and provided in consideration of the amount of the tokens created and the size of the generated packet. Through such a method, a packet transmission rate can be limited to the target transmission rate. In addition, when there is traffic of various service classes, service can be differentially provided according to the priorities of the service classes.

Abstract: An UpLink (UL) bandwidth requesting apparatus and method in a broadband wireless access system are provided. The apparatus includes a queue length controller for determining an amount of bandwidth-request using a difference between a current queue length and a target length and a determiner for the final amount of bandwidth-request using a change rate of queue length for sending information of the calculated bandwidth-request amount to a bandwidth allocating apparatus. By rapidly and accurately predicting the bandwidth-request and reducing the request delay, Quality of Service (QoS) can be guaranteed using a minimum bandwidth.

Abstract: An apparatus and a method for a Multicast and Broadcast Service (MBS) in a Broadband Wireless Access (BWA) system are provided. A broadcasting server in a broadcasting service system includes a storage for storing broadcasting contents; a controller for determining relative offset information for a broadcasting start time with respect to each Internet Protocol (IP) packet; a generator for generating IP packets with the contents provided from the storage and recording the determined relative offset information in the generated IP packets; and a transmitter for transmitting the packets including the relative offset information to an Access Control Router (ACR).

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: Disclosed is an apparatus and method for an MBS service in a BWA system. An apparatus of a base station includes a time controller, a CAC processor, and a buffer controller. The time controller manages a broadcast start time and a broadcast end time and generates a broadcast start message at a predetermined time before the actual broadcast start time. Upon receipt of the generated broadcast start message from the time controller, the CAC processor calculates a capacity decrease due to broadcast service and subtracts the capacity decrease from the current available capacity to update the available capacity. Upon receipt of the generated broadcast start message from the time controller, the buffer controller controls the buffer occupation of unicast traffic in order to provide the buffer space required for a broadcast service.

Abstract: A method and apparatus for managing a buffer of a Radio Access Station (RAS) in a communication system are provided. An available buffer space determiner sets a threshold for each service class for scheduling packet input/output of the buffer according to priority of a service class, estimates and stores, upon receipt of a packet at the buffer, an available space size of the buffer after the packet reception, compares the estimated available space size of the buffer with a first threshold corresponding to a first service class indicative of a service class of the packet, and schedules packet input/output of the buffer according to the comparison result. A processor module schedules packet input/output of the buffer according to an output of the available buffer space determiner. The present invention can improve quality of services through service differentiation based on priorities of service classes and buffer management based on characteristics of the corresponding service traffics.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: A system and method for transmitting/receiving a multicast/broadcast signal in a communication system are provided, in which if the communication system includes at least one zone to which the same service is provided and the zone includes at least one ASN_GW and at least one BS connected to the ASN_GW, the ASN_GW generates a second multicast/broadcast signal using a received first multicast/broadcast signal according to information about the zone, generates time information indicating a time when the BS is to transmit the second multicast/broadcast signal, and transmits the second multicast/broadcast signal and the time information to the BS.

Abstract: Provided are a Connection Admission Control (CAC) method and apparatus in a Broadband Wireless Access (BWA) system. The CAC method includes checking a class of a requested service; converting the transmission request rate of the service into the number of required air resource blocks by using an average block capacity of the checked class; and determining whether to admit or deny connection by comparing the number of required resource blocks with the number of available resource blocks.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.

Abstract: The present invention relates to a tetrafluorobenzyl derivative and a pharmaceutical composition for prevention and treatment of acute and chronic neurodegenerative disease in central nervous system and ophthalmic diseases containing the same. The tetrafluorobenzyl derivative of the present invention can effectively be used to prevent and treat chronic neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and Huntington's disease, degenerative brain disease such as epilepsy and ischemic brain disease such as stroke.