Abstract: Cell search method in an asynchronous mobile communication network suitable for reducing a hardware complexity and a power consumption of a mobile terminal by improving a cell search method suggested to ETSI(European Telecommunications Standards Institute) presently, method including the steps of (a1) the user device obtaining a slot synchronization for every slot assigned to the first and second synchronization channels using the first synchronization signal transmitted from the base station, and detecting a position of an omitted synchronization code when there is the omitted synchronization code from a plurality of synchronization codes in the first synchronization signal, (b1) searching for a starting point of each frame assigned to the first and second synchronization channels and one base station group the base station is in use by using the second synchronization signal, and (c1) the user device determining a code for identifying the base station among the second codes used by the base station group fr

Abstract: An apparatus for multiplexing a line and a data transmission method therefor are provided to improve data transmission efficiency. The apparatus for multiplexing a line according to the present invention includes: a plurality of conversion processors for modulating a call processing request signal or transmission data from each user application by a predetermined mode and then demodulating the signal or data to an original data. The apparatus can also process an external incoming call processing request signal or transmission data by a predetermined modulation/demodulation mode and provide the incoming signal to a corresponding user application. The apparatus includes a main controller for processing the call processing request signals provided from the conversion processors, and generating call control data that is added to the at least one header. The main controller is also configured to separate header data included in incoming transmission data.

Abstract: A system and method for allocating channelization code and scrambling code in multiple code rates is disclosed. In the present invention, many user signals that have various chip rates in overlaid frequency band can be transmitted with minimum interference between users, by allocating orthogonal spreading code in which the sum of bits for a period that is determined by the ratio of chip rates is canceled respectively, as channelization codes.

Abstract: Method for performing a random access in a mobile communication system, including the steps of monitoring at base station a state of a reverse common channel, determining state information of the reverse common channel corresponding to a result of the monitoring using one slot allocated to a forward common channel, and transmitting the state information to respective mobile stations through the forward common channel, whereby improving a message transmission efficiency because one random access slot allocated to the forward common channel is used, not entirely, but partly, or the state information of the reverse common channel is transmitted repeatedly for a given times in a case when the base station transmits state information of the reverse common channel to all mobile stations within cells of sectors of its own.

Abstract: An apparatus and method for measuring the bit error ratio of a transmission system is provided, which can accurately report the degradation of the service quality of a line to an operator by accurate BER calculation under an exceptional situation where an excessive error is instantaneously generated. This is preferably accomplished by storing the number of bit errors in buffers at an interval of time T, scoping these buffers by a sliding window of a preset size, and judging whether or not an E-BER alarm is generated using the average number of bit errors of the scoped sliding window buffers. In addition, it is also possible to intermittently report an error repair situation under which an error is generated by scoping buffers by a sliding window of a set size and judging whether or not an E-BER alarm is cleared using the average number of errors of the scoped sliding window buffers, for thereby accurately and rapidly operating the system.

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 reframer and Loss Of Frame (LOF) checking apparatus excludes an input frame data having an improper start point, carries out a reframing process, checks whether the reframed data is normal, and outputs a LOF state to a checking board or operator, in accordance with a predetermined Frame Alignment Signal (FAS) of a digital hierarchy structure. The reframer and Loss Of Frame (LOF) checking apparatus includes frame filtering and realigning units for detecting a frame start point of input frame data by using the FAS, excluding input data having an improper start point that is caused by a frame data loss, by using the frame start point detecting value, and outputting reframed data having a normal frame format. The apparatus also includes LOF declaring and releasing units for re-detecting the FAS in the reframed data, checking whether the reframed data is normal, setting a frame loss or loss releasing state indicator, according to the checking result, and outputting each state indicator signal.

Abstract: The present invention relates to a power supply device for a radio telephone system which can normally perform radio communication during power failure, by providing power of a battery disposed at a main body of the system or a wireless handset to the inside circuit of the main body, when direct current power is not supplied to the radio telephone system due to the power failure or the like.

Abstract: A loop test apparatus of a packet routing bus in a communication system and a loop test method thereof capable of testing entire functions of the packet routing bus of a full-duplex transmission mode and transmitting and receiving nodes by adding a loop test function to the packet routing bus.

Abstract: A vector modulator is disclosed which includes a first amplitude invariant phase shifter for shifting a phase of a received signal at fixed intervals within a preset first shifting range and a quadrature hybrid coupler for separating an output of the first amplitude invariant phase shifter into at least two different channel signals having a 90° phase difference to each other. A second amplitude invariant phase shifter shifts a phase of a first channel signal among outputs of the quadrature hybrid coupler by a fixed amplitude within a prescribed second shifting range and a third amplitude invariant phase shifter shifts a phase of a second channel signal among outputs of the quadrature hybrid coupler by a fixed amplitude within a prescribed third shifting range.

Abstract: The present invention relates to a switching system, and in particular to a path management method for a switching system which is capable of periodically checking a path state of each hardware board in a switching system of a dual active structure, managing the checked state based on a database, so that an operator recognizes a change in the states of the hardware boards. In addition, the present invention provided a standby path capable of searching an actual active path at the current point based on the database. A path test method for a switching system is provided for thereby implementing a path test for an entire interval or a certain interval with respect to the active and standby paths. Therefore, in the present invention, it is possible to enhance a continuity and reliability of a service and implement an easier maintenance of the system.

Abstract: A device for transmission/reception of a facsimile data in a separate type WLL system is provided, in which an analog G3 facsimile signal is converted into a CDMA signal format for transmission/reception of the signal. The device includes an interface unit for transmitting facsimile data produced at a facsimile, or matching data received in an analog facsimile protocol to wire line characteristics for providing the data to the facsimile, a facsimile signal processor for receiving the facsimile data from the interface unit and converting it into a digital signal and a radio data service format, or receiving a data in a radio data service format, converting it into an analog facsimile protocol, and forwarding it to the interface unit.

Abstract: A method of managing mobile station operational parameters is disclosed in which a mutual authentication between a mobile station and a network is performed. The present method allows a mutual authentication while maintaining the updating procedure of the mobile station operational parameters in the conventional procedure.

Abstract: A method for controlling anomalous dual state of duplicated processors for a fault-tolerant system having a first and a second processors that are connected to each other through network, comprising: a first step of transmitting its own state information of either the first or the second processor to mutually another processor (twin) by using different transmission period to each other; a second step of receiving the heartbeat applied from the other processor and recognizing state information of the twin; and a third step of performing duplication states according to the state information of the twin. By doing that, when the two processors start, the seeds for random numbers are differently allocated to generate different random numbers, and the heartbeat transmission period is continuously changed by using the random numbers to differentiate the transmission and receiving time of the heartbeat between the two processors.

Abstract: A method for transmitting and receiving short message broadcast services in a communication system is disclosed. The present invention reduces a battery consumption of a mobile station by additionally using an inserted message field of a broadcast indicator for notifying whether a broadcast message is being transmitted from a base station to the MS, thereby allowing a more efficient short message broadcast service.

Abstract: A register control apparatus is provided between a master unit and a slave unit for a W-CDMA WLL separation type terminal which includes a mirror register of a master unit, a register of a slave unit, a framing logic unit for periodically transmitting data to and extracting data from the master unit and the slave unit through a time slot, and a transmission path for connecting the master unit and the slave unit.

Abstract: A call holding voice message transmitting apparatus and method in a mobile communication terminal are disclosed that transmit voice data, preferably stored in the terminal, to a caller in a situation in which the user of the terminal cannot receive an incoming call from the caller. The apparatus can include a key input unit to input a command to the terminal, a controller that generates a control signal adapted to execute the command, a microphone that converts a voice into an analog voice signal and a voice encoder that converts the analog voice signal into a digital voice signal. A memory can retrievably store the digital voice signal outputted from the voice encoder and a voice decoder converts the digital voice signal into an outgoing analog voice signal. A selection device outputs a selected one of the analog voice signal from the microphone and the outgoing analog voice signal from the voice decoder in response to the control signal from the control unit.

Abstract: Radio protocol for a next generation mobile communication system is disclosed including a radio link control layer for connecting to an upper layer through a service access point provided in advance and for connecting to a lower layer through a plurality of logic channels provided in advance. The radio link control layer includes at least one radio link control entity for transmission/reception of data to/from up-link or down-link according to a form of a data transmission mode.

Abstract: Disclosed is a method of generating pilot sequences having double lengths of slots used for frame synchronization in an up or down link of a next generation mobile communication system which adopts W-CDMA mode. Disclosed is a method of generating pilot sequences having double lengths of slots used for frame synchronization and defined by 4l+2(l=1,2,3, . . . ) while providing a mathematical method of generating code sequences of slot length.

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.