Abstract: An apparatus for searching for a cell in a mobile communication system, including: a preamble sequence storage unit storing preamble sequences each of which corresponds to one preamble index, and a cell searching unit correlating a received signal and the stored preamble sequences in a time domain and identifying the preamble index corresponding to the received signal. The cell searching apparatus correlates a received signal and stored preamble sequences in a time domain. The apparatus employs binary quantization of preamble sequences to reduce calculation and memory size. Also, the stored preamble sequences are phase pre-rotated according to a segment number, to prevent from a burden of frequency offset correction caused by three different hypotheses. Accordingly, a complexity of the cell searching apparatus is reduced and cell searching performance becomes more accurate.

Abstract: The present invention relates to a router (for example, ACR) which provides a mobility function and a delivery function with a portable Internet core network while controlling RAS, which is a base station, as a basis network element of an access network in a portable Internet (for example, WiBro) service, and particularly, provides a new paging algorithm in order to overcome the limit of a paging in a conventional routing scheme, and to effectively process the buffering function for seamless connection maintenance and the paging function for a destination terminal with respect to the terminated call of a terminal in a non-active mode. A router of the present invention includes a control plane that buffers a data packet for a non-active mode, and performs a paging for a corresponding non-active mode terminal.

Abstract: Disclosed is an apparatus and a method for down-converting frequencies of an input signal by separating the signal to which at least two frequencies are allocated according to each frequency, and then outputting at least two digital IF signals in a communication system. The digital down-converting apparatus includes a band-pass filter, an analog-to-digital converter, down-converters, up-converters, and Serializer/Deserializeres, etc. First, the signal to which at least two frequencies are allocated is down-converted into baseband signals respectively. Then, the baseband signals are up-converted into signals of a predetermined frequency respectively.

Abstract: A likelihood metric calculation method including: estimating a channel of a received signal and generating a channel estimate; compensating a channel of the received signal according to the channel estimate; calculating a region variable according to the channel estimate; and comparing the region variable and a magnitude of the compensated received signal and calculating a likelihood metric of the received signal according to a result of the comparison.

Abstract: Disclosed is an interface for interfacing an element management server in a wireless telecommunication system and a method for the same. The element management server for managing an ACR and an RAS, which are elements of the wireless telecommunication system, are adapted to interwork with the ACR and the RAS, respectively, so that the server can directly manage the ACR and the RAS and, particularly, the RAS can be operated more efficiently and maintained/repaired more quickly. The element management server manages the version of a package regarding all processors of lower elements and software to be loaded, and respective processors of the lower elements store nothing but their setup information (e.g. software, version) so that, if necessary, the element management server can transmit specific software only to the lower elements. This guarantees fast software download and provides users with stable services.

Abstract: Disclosed is controlling entry of a portable internet terminal into a network, in which provided is a method and a system for processing a network entry request received from a portable internet terminal, and then controlling a network entry operation of the portable internet terminal, and is the portable internet terminal. The method includes the steps of: receiving an network entry request for entry into a portable internet network from the portable internet terminal; determining if the portable internet terminal can enter the portable internet network in response to the network entry request; and generating a network entry restriction message according to an entry restriction type in a case where the portable internet terminal cannot entry the portable internet network as a result of the determining, and transmitting the network entry restriction message to the portable internet terminal to be set a network entry operation rule by the portable internet terminal.

Abstract: Provided is a real-time polling service (rtPS) class of an IEEE 802.16/WiBro system. An rtPS scheduling method of the IEEE 802.16/WiBro system includes subscriber station (SS) located in a network where the IEEE 802.16/WiBro system is realized inserting a timestamp indicating time information when uplink data is transmitted from an application layer of the SS into the uplink data; and after the SS receives polling from a base station (BS), comparing the timestamp inserted into the uplink data and a current time, and, if a difference between the timestamp and the current time is greater than a predetermined period of time, firstly dropping the uplink data.

Abstract: Disclosed is an apparatus and a method for up-converting frequencies of digital Intermediate Frequency (IF) signals input through at least two paths, and then outputting IF signals to which at least two frequencies are allocated in a communication system. The apparatus includes Serializer/Deserializers (SerDeses), down-converters, up-converters, a signal adder, a Digital-to-Analog Converter (DAC), and a Band-Pass Filter (BPF), etc. In relation to digital IF signals respectively input through at least two paths, first, the frequency down-conversion is performed, and then, the up-conversion to relatively low frequencies is performed.

Abstract: Provided is a traffic class of an IEEE 802.16/WiBro system. The unsolicited grant service (UGS) scheduling method with regard to a subscriber station (SS) and a base station (BS) that are disposed in a network wherein an IEEE 802.16/WiBro system is realized, the method includes: when the SS requires 1 through M (where M is a positive integer) UGS flows, and the BS serves 1 through N (where N is a positive integer) frames, the BS storing grant periods and guaranteed sizes that are granted to the M UGS flows in each N frame; and the BS comparing service capacity of a frame and a sum of guaranteed sizes of each flow belonging to the N frames, and determining if an overload occurs.

Abstract: Provided is a bidirectional service flow management method in a wideband wireless connection communication system, and more particularly, a method of performing a bidirectional flow establishment. The method of providing a flow service in an IEEE 802.16/WiBro includes: generating a revised dynamic service addition (DSA) related message in which an area for designating bidirectional flow management information is allocated from a standard DSA related message; and performing a bidirectional flow initialization process between a subscriber station (SS) and a base station (BS) via single control message negotiation based on the revised DSA related message.

Abstract: Disclosed is an apparatus and a method for controlling automatic gain in a wireless communication system using a Time Division Duplex (TDD) scheme. The apparatus comprises a power detecting unit for detecting a power of a TDD frame signal on a receive path; an Automatic Gain Control (AGC) synchronizing signal generating unit for generating an AGC synchronizing signal enabled or disabled either during a Down Link (DL) frame or during an Up Link (UL) frame of a TDD frame; an automatic gain calculating unit for calculating a gain control value based on the power detected by the power detecting unit either during the DL frame or during the UL frame of the TDD frame in response to the AGC synchronizing signal; and an AGC unit for performing gain control for the TDD frame signal on the receive path on the basis of the calculated gain control value. Hence, as AGC is performed during only an actual receive frame, the optimized demodulation performance can be maintained.

Abstract: Provided is a resource management method in a communication system, and more particularly, a resource management method based on priority in a wireless communication system. The resource management method in a wireless management network includes: setting a priority factor value with regard to a link flow for which link establishment is requested; and if a capacity required by the flow for which link establishment is requested exceeds a remaining capacity of a base station, increasing the remaining capacity of the base station by sequentially reducing a minimum reserved rate (MRR) value of flows that receive a service at a lower priority than the flow for which link establishment is requested to a maximum sustained rate (MSR) value, until the remaining capacity required by the flow for which link establishment is requested is generated.

Abstract: The present invention is an oscillating apparatus and a method for Time Division Duplex (TDD) in a wireless communication system. In a Phase-Locked Loop (PLL) synthesizer applied to the wireless communication system, an oscillation signal generating from a PLL circuit is output by way of an isolation unit in which a capacitor for Direct Current (DC) blocking and a predetermined isolator are combined to form one body. Hence, the oscillation signal isolated from a subsequent circuit through the isolation unit is not affected by the effect of switching noises that flow from a Radio Frequency (RF) switch or into a power amplifier of a transmitter during switching between each Down Link (DL) frame and each Up Link (UL) frame, and therefore the performance of a system can be improved.

Abstract: Provided is a method for dynamic resource allocation of uplink and downlink in an OFDMA/TDD cellular system. The method for dynamic resource allocation of uplink in an OFDMA/TDD cellular system includes the steps of determining the number of sub-channels which can be allocated to each user through an FLR algorithm; performing channel allocation for a first frame through a round-robin algorithm in which channel information is not needed; performing dynamic channel allocation for a next frame through uplink channel information measured by uplink channel sounding; and performing power control.