Abstract: Disclosed is a signal path searching method in a mobile communication system provided with a plurality of array antenna elements. According to the method and apparatus, the path search is performed using a signal of a chip level or a signal of a symbol level, and it is decided whether to first perform a temporal process or a spatial process according to the level.

Abstract: A method for accomplishing a handoff between mobile communication systems includes: a first mobile communication system having means for matching elements of a low generation mobile communication system; a second mobile communication system having means for matching elements of a high generation mobile communication system; a gateway connected with each of the mobile communication systems and having means for performing protocol conversion and address mapping.

Abstract: A method for sub-port multicasting in an Asynchronous Transfer Mode (ATM) switching system, including inserting multicast fan-out port information for sub-ports of each of a plurality of switch ports into a multicast cell at an ingress port card, transmitting the multicast cell to an egress port card, reading the multicast fan-out port information from the multicast cell at the egress port card, and performing multicasting for the sub-ports corresponding to the multicast fan-out port information.

Abstract: An ATM switching apparatus and method in which delay of ATM cells is prevented and multicast is implemented are disclosed. The multicast is determined by analyzing a received cell's destination address and the transfer times value. If there are several destination addresses, the same cell buffer address is stored in the respective destination addresses. By using the cell buffer addresses stored in the respective destination address, the cells are transferred until the transfer times value becomes zero. If the transfer times value becomes zero, the cell buffer address used at this time is stored into the cell buffer address storage unit making it available to use as an address for storing a new cell.

Abstract: An short message service switching private branch exchange system and a method can reduce costs. The method can include certifying whether a usable DSP exists or not when an office line and a speech path are connected to each other, and transmitting an short message service signal transmitted from the office line to the DSP through a PCM channel if the usable DSP exists. A main processor of the private branch exchange can certify an extension line terminal that will receive short message service, generate an short message service signal having a format corresponding to a kind of the extension line terminal by using the DSP, and transmit the formatted SMS signal to an extension line interface unit of a corresponding extension line terminal. The system switches an SMS signal between an office line and an extension line by sharing the DSP, for example, by time division.

Abstract: A system and method for controlling transmission of a radio packet data are disclosed. A time point when a congestion controlling mechanism, causing a TCP performance degradation with the mobile station and the PDSN, is previously detected, and when the mechanism is operated, it is quickly returned. Thus, in spite of a bit error (data loss) existing due to the characteristics of the radio data service, a reliable data service can be guaranteed.

Abstract: An apparatus and method are disclosed for determining different reverse rates, in accordance with a reverse data transmission state of each mobile station, at a base station having a 1×EV-DO system. The present invention improves the processing capacity of a reverse link by generating a weight based on a comparison result of a present data amount and a previous data amount of each mobile station, calculating a new reverse rate limit by imposing the generated weight onto a predetermined reverse rate limit, and transmitting the newly calculated reverse rate limit to every mobile station within a reverse rate limit message.

Abstract: A protocol processing apparatus and method in a mobile communication system operates a transmitting end according to whether transmission errors occur in a wireless section in consideration of conditions of the wireless section. A TCP processing apparatus and method of a base transceiver subsystem (BTS) in a mobile communication system can operate a TCP sending end in a persist or congestion override mode by setting a window size of the TCP sending end as ‘0’ if an Ack is not arrived from a TPC receiving end for a round trip time of a wireless link. Preferred embodiments of the present invention can reduce or prevent TCP performance degradation caused by congestion avoidance and control by preventing the TCP sending end from performing congestion avoidance and control by packet loss in the wireless link section. Also, the BTS updates the round trip time (RTT) of the wireless link when the Ack is arrived from the TCP receiving end for the RTT of the wireless link.

Abstract: Disclosed is an apparatus and method for transforming data transmission speed that transforms data transmission speeds of data transmitting apparatuses that have different data transmission speeds using a DPRAM. By using a DPRAM to transform transmission speeds, the apparatus and method for transforming data transmission speed is simplified, thereby improving the procedure for transforming data transmission speed. Furthermore, it is possible to prevent data from being lost at the time of transforming data transmission speed.

Abstract: A PBX connected to a public exchange includes a separate caller ID service unit for providing a caller ID and/or a system tone by performing a digital signal process. To display the caller ID on a receiver terminal, or caller ID phone, a line is established with the PBX through general switched telephone network, and a CID received through the line is converted and stored in the caller ID service block mounted with at least one memory through a switching block, under control by a control block. Then, the control block transmits all or part of the stored CIDs to the caller ID phone through the switching block and/or a subscriber line convergency unit.

Abstract: The present invention relates to a system and method for multimedia packet processing and, in particular, to a system and method for processing video or audio data in real time or near real time. The transmission of ordinary data packets that can tolerate a certain amount of delay is deferred so that video or audio packets can be transmitted ahead of ordinary data packets. The deferred data packets are stored in the second buffer module of the dual buffer module. After all of the video packets or audio packets are transmitted, the deferred data packets are transmitted prior to the transmission of other waiting data packets stored according to a related art back-off process.

Abstract: A method for processing an access-request message in an IMT-2000 system is described. A user password is encrypted by a temporary authenticator value and an authenticator value which is able to verify an access-request message itself is generated, so that when an AAA server receives the access-request message, it can directly verify the access-request message without analyzing the received access-request message. Thus, even if a malicious hacker transmits a large quantity of false access-request message to the AAA server, the use of the system resource and the message processing time are reduced, so that the system is prevented from crashing.

Abstract: A method for operating and translating SCCP global titles to implement the global roaming uses a signal message routing based upon the SCCP global title. According to one embodiment of the present invention, if a received signal message is routed according to the global title, the required global title translation is for global roaming is determined by detecting whether a local global title has been defined in the received signal message. If the translation is to be made for global roaming, then the types of global title translations to be conducted are determined among the country code global title translation, the network code global title translation and the mobile subscriber identification number global title translation based upon whether the country code and/or the network code of the local global code are identical with those of the global code to be translated. In this manner, the present invention may implement the efficient SCCP global title translation while supporting the global roaming.

Abstract: A method for upgrading data in a system adapted to implementing one or more programs includes a) loading a new program into the system and a version adapter for changing the old data previously stored in the system; b) generating new data adapted to the new program by processing the old data using the version adapter; c) storing the generated new data in a separate memory area; d) determining whether the new program operates normally by implementing the new data; and e) deleting an old program and old data if the new program is determined to operate normally.

Abstract: A linear power amplifier (LPA) shelf for a mobile communication base station including a plurality of LPA types installed in one LPA shelf. The LPA shelf includes a signal dividing unit and a signal combining unit, which can connect either a single path or multiple paths. The LPA shelf further includes a first LPA type conversion unit and a second LPA type conversion unit, which perform a switching operation so as to use one LPA of six LPAs as either a redundant LPA or an LPA that amplifies a gamma sector signal. Accordingly, since a plurality of LPA types can be supported with one LPA shelf, it is possible to prevent service from being stopped and prevent the waste of time, cost and human resources due to the replacement of equipment.

Abstract: A CDMA packet data system is disclosed that can dynamically allocate channels in the CDMA packet data system). Using the disclosed dynamic allocation method, the utilization efficiency of multiple channels is increased and the transmission rate of packet data is increased. This is because a static, specific channel is not allocated to each terminal, but rather the system dynamically allocates multiple channels to each mobile terminal. Thus, the base station provides information on all channels used in the system to multiple terminals. The terminals check the occupied state of each channel before transmitting packet data, and thereafter transmitting packet data through an unoccupied channel.

Abstract: An optical wavelength locking system is provided that includes a plurality of optical signal generating units for generating optical signals corresponding to a plurality of channels, and an optical wavelength locking unit for receiving the optical signals corresponding to the plurality of channels and sequentially controlling a wavelength fluctuation exhibited by the optical signal of each channel. Since one optical wavelength locking unit is used for a plurality of optical sources, production costs are reduced, a better utilization of available space can be achieved and the reliability of the system is improved.

Abstract: A method of converting AAL2 cells that includes an original user data set into AAL5 cells and another method of converting AAL5 cells that includes an original user data set into AAL2 cells are disclosed. In the method of converting AAL2 cells, the length of the data subset included in each AAL5 cell generated is stored in a memory. Therefore, it is not necessary to store all the payloads of generated cells. When a last CPS packet is extracted, a total length of the original user data can be found using a set of lengths stored in the memory. As a result, the present invention requires only a small memory space, and any unnecessary delay problem is eliminated.

Abstract: A duplexing control system and method of an ATM switching system capable of carrying out a stable switching of duplexing with a simple circuit construction is disclosed. The system has two boards respectively having a first interface matching with an input bus so as to interface received ATM cell, a second interface matching with an output bus so as to interface a transmitted ATM cell, an SAR for disassembling and assembling data units contained in an application layer in the transmitted/received ATM cell by a unit of ATM cell, a control section for controlling general operation in order to maintain the active state according to data processing information contained in a signal applied from the cell disassembling and assembling circuit, when the its own board is endowed with the active authority by the signal, and a DRAM for storing data transmitted/received for the switching of duplexing between the boards.

Abstract: The present invention relates to a voice mail system (VMS), and more particularly, to a system and method for unifying multiple connection ports of a voice mail system. A system according to the present invention includes an external input/output controller (EIOC) provided between a VMS having a plurality of boards that perform the same function and a plurality of external servers. The EIOC is adapted to provide an unified network connection point between the plurality of boards and the plurality of external servers by routing a message transferred from any one of the plurality of boards to any one of the external servers. The EIOC is also configured to route a message transferred from any one of the plurality of external servers to a corresponding board of the VMS. The stability of such a system is increased by making external servers (IP networks) regard the VMS as a single network connection point.