Abstract: The present invention relates to method for managing subscriber location information in mobile communications system. When a mobile subscriber moves to other place, wherever, registration notification(RN) is carried out from a visitor location register(VLR) to a home location register(HLR). In case of requested with overlapped the registration notification(RN) and call processing procedure about the same subscriber, the HLR protects multi-location registrations about the same subscriber until a previous registration notification(RN) is completed. Thereby, this invention relates to method for managing subscriber location information in mobile system, in order to always maintain location information about a subscriber in the HLR and VLR, correctly.

Abstract: An apparatus and method for controlling a back light in a mobile terminal is provided, in which a first back light of a liquid crystal display and a second back light of a key pad are independently controlled. The first and second back lights are driven if a flip cover is opened, while the first back light is only driven if the function selection key is input. Since the second back is not driven when the function selection key is input, unnecessary power consumption can be reduced.

Abstract: In the preferred embodiment, the transmission length of the non-full rate frame is shortened frame in order for the mobile terminal 100 to monitor other frequencies with a single receiver. Modulated symbols of non-full rate frame are transmitted with reduced repetition maintaining the sum of repeated symbol energy. Generally, for 1/n (n=2,4,8) length transmission, 1/m (m≧n) rate frame repeated m/n times and transmitted with n/m symbol energy of the full rate frame. The system may use rate limitation to generate a non-full rate frame. A position of the transmitted symbols may be randomized by a mobile specific predetermined random code to minimize interference between terminals different from each other. For intensive frequency scanning and synchronization signal transmission, non-transmitting period can be assigned for successive frames of some interval.

Abstract: An apparatus and method of a state metric memory for a viterbi decoder is disclosed including generating survival path metrics from the current-state metrics and simultaneously storing at least two next-state metrics designated by control signals. The present invention includes a plurality of submemories in a memory unit wherein each submemory stores both the current-state metrics and the next-state metrics.

Abstract: Method for making a mobile-to-mobile wireless data communication in PCS (Personal Communication Services)/digital cellular mobile telecommunication system, is disclosed, which allows a direct communication without occupying an IWU, the method including the steps of (1) transmitting an originating instruction for a terminating mobile data terminal as an originating mobile data terminal sets up a service mode, (2) making a communication using a first radio link protocol (RLP) set up between the originating mobile data terminal and a base station/mobile switching center, (3) calling the terminating mobile data terminal through an identification number of the originating mobile data terminal and a service option as the originating instruction is executed, (4) informing a signal responding to the call to the originating mobile data terminal, (5) making a communication using a second RLP set up between the terminating mobile data terminal and the base station/mobile switching center, (6) setting up protocol layers

Abstract: The present invention relates to an ATM-LAN(Asynchronous Transfer Mode-Local Area Network) switch, and in particular to an information transferring apparatus between processors of the ATM-LAN which is capable of efficiently performing an information transfer between a plurality of processors which perform an information transmission and receiving operation through a backplane based on the Ethernet protocol. The information transfer apparatus between processors of an ATM-LAN switch according to the present invention is capable of implementing an efficient information transfer between processors by providing a backplane sub-board for thereby checking an information transfer state between the processors without using a large number of devices for an Ethernet communication. In addition, it is possible to enable a stable information transfer between processors in the case of a hot swap and dual operation by providing a control logic to the backplane sub-board.

Abstract: An improved method for effectively transmitting a PSMM in a communication system is provided. According to the present invention, a mobile station decides whether s message generated in itself is a PSMM. If the message is the PSMM, the mobile station decides whether the PSMM is the most recent PSMM. If the PSMM is not the most recent PSMM, the mobile station waits until the most recent PSMM is generated. If the PSMM is the most recent PSMM, the mobile station transmits only the most recent PSMM to the base station in order to gain an acknowledgment from the base station.

Abstract: In the preferred embodiment, the transmission length of the non-full rate frame is shortened frame in order for the mobile terminal 100 to monitor other frequencies with a single receiver. Modulated symbols of non-full rate frame are transmitted with reduced repetition maintaining the sum of repeated symbol energy. Generally, for 1/n (n=2,4,8) length transmission, 1/m (m≧n) rate frame repeated m/n times and transmitted with n/m symbol energy of the full rate frame. The system may use rate limitation to generate a non-full rate frame. A position of the transmitted symbols may be randomized by a mobile specific predetermined random code to minimize interference between terminals different from each other. For intensive frequency scanning and synchronization signal transmission, non-transmitting period can be assigned for successive frames of some interval.

Abstract: A variable length coder and encoding method of a video coder is disclosed. The present variable length coder includes a code buffer, a length buffer, and a bit packer of one register and one counter. Accordingly, the present invention allows a VLC with a compact size as well as lower power consumption.

Abstract: The present invention is to provide a method for controlling a handoff in a communication system. The pilot strength of a base station and the frame quality of a forward link are measured by a mobile station. The mobile station checks whether the measured pilot strength is higher than a parameter (T-ADD) that is a threshold value for the pilot strength of the base station to which a new communication path is supposed to be added. Furthermore, it is checked whether or not the measured frame quality of the forward link is good as compared with a preset parameter (T_QUALITY). It is also checked whether or not the measured pilot strength is higher than the T_PRANKth strength of the pilots of the currently active base stations. The mobile station sends a pilot strength measurement message (PSMM) to a handoff control system in order to establish a new communication path through the base station according to the above checking results.

Abstract: A phone call service based upon sensing a hand-held state of a cellular phone is disclosed According to the present invention, a user may receive and terminate a call by holding or not holding the phone, thereby allowing the user to receive a more convenient phone call service.

Abstract: In the preferred embodiment, the transmission length of the non-full rate frame is shortened frame in order for the mobile terminal 100 to monitor other frequencies with a single receiver. Modulated symbols of non-full rate frame are transmitted with reduced repetition maintaining the sum of repeated symbol energy. Generally, for 1/n (n=2,4,8) length transmission, 1/m (m≧n) rate frame repeated m/n times and transmitted with n/m symbol energy of the full rate frame. The system may use rate limitation to generate a non-full rate frame. A position of the transmitted symbols may be randomized by a mobile specific predetermined random code to minimize interference between terminals different from each other. For intensive frequency scanning and synchronization signal transmission, non-transmitting period can be assigned for successive frames of some interval.

Abstract: A video/audio alarm processing method and apparatus for a base station manager in a mobile radio communication system capable of classifying trouble state data of base station controllers and base stations by grades and informing to a user the trouble state as video and audio alarms in accordance with the classified grade of the trouble state data. According to the method, the data of a predetermined number of bits which is received from the base station controllers and base stations is converted and stored, and whether the trouble state data exists or not in the stored data is judged. If the trouble state data exists, it is classified by grades, and the video and audio alarms are produced in accordance with the classified grade of the trouble state data.

Abstract: Reverse link soft hand off method for improving a reverse link communication quality in a CDMA cellular communication system having a plurality of base stations, at least one mobile station, and at least one base station controller, including the step of a particular mobile station being handed off from a first channel on a serving base station to a second channel on a target base station, if a reverse link traffic signal strength or a reverse link pilot signal strength for the particular mobile station measured at a target base station exceeds a preset threshold.

Abstract: Method for processing a statistics data accumulated in a mobile station in a mobile communication system, wherein a base station checks presence of a request for processing the statistics data accumulated in the mobile station, classifies items of the statistics data into groups according to attributes and characteristics when the request presents, and composes a request message for processing the statistics data using the groups, which is transmitted to the mobile station.

Abstract: An apparatus for measuring a voltage standing wave ratio of a base station. The apparatus comprises: a unit for measuring the voltage standing wave ratio of a transmitting terminal by coupling an input signal from the base station, and by comparing the difference of the coupled signal and a signal reflected from a transmitting antenna; and another unit for measuring the voltage standing wave ratio of a receiving terminal by comparing an input signal from a base-station test unit with the signal reflected from a receiving terminal.

Abstract: A video/audio alarm processing method and apparatus for a base station manager in a mobile radio communication system capable of classifying trouble state data of base station controllers and base stations by grades and informing to a user the trouble state as video and audio alarms in accordance with the classified grade of the trouble state data. According to the method, the data of a predetermined number of bits which is received from the base station controllers and base stations is converted and stored, and whether the trouble state data exists or not in the stored data is judged. If the trouble state data exists, it is classified by grades, and the video and audio alarms are produced in accordance with the classified grade of the trouble state data.

Abstract: A reduction method of successive hard handoffs which prevents the call from dropping and the communication quality from deteriorating which are caused by the successive hard handoffs frequently occurring between base stations according to the system resources in the CDMA mobile communication system is disclosed. The reduction method includes the steps of making a decision on soft or hard handoff possibility according to the strength of the pilot signals of the existing base station holding a current call and the newly added base station by using the pilot strength measurement message received from the mobile station, informing the control station of the resource assignment possibility of the added base station by using the handoff request message transmitted from the control station to the added base station, and performing or completing handoffs according to said resource assignment success or failure.

Abstract: A transmission power control method in a mobile communication system using a code division multiple access (CDMA) method includes: a power control process in an access mode having: a step of measuring a transmission power of an initial access channel transmitted from a terminal; a step of comparing the measured transmission power level with a pre-setted adequate power level; a step of transmitting a transmission power adjusting message to the terminal according to the comparison result; and a step of the terminal adjusting the transmitting power of the traffic channel to the adequate power level according to the transmission power adjusting message transmitted from a base station; and a power control process in a traffic mode having: a step of measuring the transmission power level of the traffic channel transmitted from the terminal; a step of comparing the measured transmission power level with the pre-setted adequate power level; a step of transmitting an one-bit power control bit to the terminal according

Abstract: Provided with a method of performing power control in a CDMA mobile communication system, characterized by including the steps of: repeatedly updating information concerning the change of a channel state between a mobile station and a base station at regular intervals; varying a channel gain up/down time and/or a channel gain up/down delta adaptively based on the updated information; and adjusting the channel gain between the mobile station and the base station.