Abstract: A device and method for outer-loop power control in a discontinuous transmission mode in a CDMA mobile communication system. In an outer-loop power control method for a non-frame data transmission period of a dedicated control channel (DCCH) which transmits frame data discontinuously, the signal-to-noise ratio (SNR) of power control bits (PCBs) received at a mobile station from a base station is measured for the frame period, and it is determined whether the frame has errors based on the measured SNR. A closed-loop power control threshold is increased if a frame error exists and decreased if no frame errors exist.

Abstract: Devices and methods are provided for determining an initial transmission power for a forward link channel transmitter of a base station in a mobile communications system. A preferred method includes the steps of measuring, at a mobile station, the strength of a specified forward link channel signal received from the base station and sending information indicative of the strength of the specified forward link channel signal to the base station; and determining, at the base station, the initial transmission power for the specified forward link channel signal according to the information received from the mobile station and using the determined transmission power for controlling an initial transmission power for an other forward link channel.

Abstract: An STD (Selection Transmit Diversity) communication method. In the method, a base station selects a transmission antenna corresponding to an antenna selection signal received from a terminal, transmits a traffic channel signal through the selected antenna, and transmits a predetermined part of the traffic channel signal through an unselected antenna.

Abstract: A data transmitting method and apparatus with QoS guaranteed in a communication system supporting services with different QoS requirements. The services are classified into a QoS service and a non-QoS service and discriminately processed according to the classification. To maximize the efficiency of transmission links, the data rate of a service is dynamically controlled according to the state of the transmission links. Furthermore, the transmission links are prioritized to guarantee the quality of the QoS service even when data congestion occurs and data burstness is regulated to minimize a congestion period during data transmission. Therefore, QoS guarantee is maximized according to services in a communication system supporting data service.

Abstract: A traffic channel transmission device for a CDMA communication system using a plurality of coding rates and orthogonal codes, determines a present channel condition and adaptively selects a coding rate and an orthogonal code according to the determination. In the device, a channel receiver receives a channel signal and a controller analyzes the received signal to decide an environment of a channel in service and generates a coding rate select signal and orthogonal code information according to the decision result. A channel transmitter includes a channel encoder for encoding transmission data at a coding rate selected according to the coding rate select signal and an orthogonal modulator for generating an orthogonal code according to the orthogonal code information to spread the encoded data with the generated orthogonal code, whereby the channel transmitter adaptively encodes and spreads the transmission data according to the channel environment.

Abstract: A QoS-based call admission system and method for a mobile communication system. To establish a call for a mobile station according to the QoS of the call, upon request of setup of a call requiring a QoS guarantee, a base transceiver station determines whether a channel element is available. In the presence of an available channel element, the base transceiver station determines whether a remaining bandwidth can support a data rate required to guarantee the QoS. If the data rate is supported, the base transceiver station assigns the channel element and connects its intra switch to a base station controller. Then the base transceiver station transmits a call accept response signal to the base station controller.

Abstract: Disclosed is a method for transmitting a packet through a plurality of physical links in a mobile communication system in which a base station controller (BSC) is connected to a base transceiver system (BTS) through the plurality of physical links. The method includes the steps of determining whether a specific service uses at least two links, when there is transmission data for the service; setting up a sequence number in the transmission packet, when the service uses at least two links; and transmitting the packet through a link selected from the two links.

Abstract: A device and method for communicating a common channel message in a CDMA communication system. The device comprises a base station transmitter and a common channel transmitter. The base station transmitter includes a specific channel transmitter for outputting a channel signal at a second transmission power level for a predetermined time duration and otherwise outputting the channel signal at a first transmission power level. The common channel transmitter transmits a common channel message at an assigned slot duration. A power supply voltage is provided to the receiver of the mobile station for the predetermined time duration and the assigned slot duration to enable the receiver. The power supply voltage to the receiver is otherwise disengaged from the power supply so as to allow the receiver to operate in a sleep mode.

Abstract: A method and apparatus for retransmitting packet data lost during its transmission from a BSC to a BTS in a mobile communication system. The BTS sequentially receives packets from the BSC and determines whether there is a lost packet. When packet loss is detected, the BTS buffers packets received after a lost packet and requests a retransmission of the lost packet to the BSC. The BSC retransmits the lost packet to the BTS in response to the retransmission request. The BTS rearranges the retransmitted packet and the buffered packets according to the right order and transmits the rearranged packets to an MS.

Abstract: A power control device for a mobile communication system includes a base station transmitter and a mobile station receiver, wherein the base station transmitter includes: a plurality of PCB pattern generators for multiplying PCBs for a plurality of mobile stations by user patterns assigned to the respective mobile stations, to generate PCB patterns for the respective mobile stations, wherein the user patterns are orthogonal with one another; an adder for adding up the PCB patterns from the plural PCB pattern generators to generate a power control signal; and a transmitter for modulating the power control signal received from the adder and transmitting the modulated power control signal, wherein the mobile station receiver includes: a power control signal extractor for extracting the power control signal within a given interval of a reception signal received on a single code channel, wherein PCB patterns for a plurality of mobile stations are added to the power control signal; a PCB pattern generator for multi

Abstract: A base station device for a CDMA communication system includes a controller for changing a reference value for reverse closed loop power control in a control hold state, and a forward dedicated control channel transmitter for transmitting a power control bit for controlling transmission power of a reverse link according to the changed reference value.

Abstract: A power control bit inserting method between a base station and a terminal. The base station and the terminal each use a plurality of adjacent frequency bands as signal paths with independent signal paths of a real part and an imaginary part given to each frequency. In the power control bit inserting method, a unit time is set to a power control group period, n-bit data is allocated to each signal path, the power control group period is divided by the number of signal paths, and a power control bit is inserted in each divided segment, so that the insertion positions in the real and imaginary parts of each frequency are spaced from each other by n/2 bit and the start position of the real signal path of each frequency is inserted at an appointed bit position of the corresponding frequency.

Abstract: A common power control channel transmission device for a base station in a CDMA communication system is provided having a selector for receiving power control commands to be transmitted to multiple subscribers and multiplexing the received power control commands; and a spreading modulator for spreading an output of the selector by multiplying the output of the selector by a spreading sequence. The common power control channel transmission device can be used to control power of a reverse link common channel. For the power control of the reverse link common channel, the base station receives a signal from a mobile station via the reverse link common channel, and transmits to the mobile station a power control command for controlling a transmission power of the reverse link common channel according to a measured strength of the received signal.

Abstract: A method for controlling the transmission power of the reverse common channel for a mobile station in a CDMA communication system. In the method, the mobile station transmits a preamble signal at predetermined periods with increasing transmission power. Upon receipt of an acknowledge signal from a base station, the mobile station accesses the reverse common channel. In order to avoid multiple mobile stations from simultaneously generating increasingly powerful and interfering transmissions, the method generates two transmission power control signals: one based on the measured strength of a signal received from the base station and the other based on an accumulated value of power control commands transmitted by the base station. These two signals are accumulated and used to control the preamble signal.

Abstract: Method and apparatus for providing a packet data service between a terminal and a base station in a mobile communication system includes packet data being transmitted from the terminal (base station) on a reverse (forward) packet traffic channel to the base station (terminal) during a data transmission period; the occupation of the reverse (forward) packet traffic channel is released during a data transmission suspension period; and the base station controls the reverse (forward) packet traffic channel over a packet control channel.

Abstract: A code division multiple access (CDMA) mobile communication system for controlling power for a traffic signal of one frame includes: a signal generator for simultaneously generating a pilot signal and the traffic signal on a frame basis; a power compensator for compensating the power of the traffic signal according to a punctured length of a punctured frame among the frames; and a signal combiner for combining the power-compensated traffic signal and the pilot signal generated from the signal generator.

Abstract: A base station and a mobile station for a CDMA communication system intermittently exchange data on a power control group unit or time slot unit in a control hold state to minimize interference. To this end, during channel transmission, the system intermittently transmits a reverse pilot channel signal in the control hold state; upon activation of a reverse dedicated control channel, transmits a normal pilot channel signal which is first generated after activation of the reverse dedicated control channel; and then transmits the reverse dedicated control channel.

Abstract: A device for time alignment on a reverse link in a CDMA mobile communication system. A base station stores a reference sync channel RTD (Round Trip Delay), calculates the difference between the reference sync channel RTD and a measured sync channel RTD, and outputs a time alignment control signal on a forward control channel when the calculated RTD error exceeds a predetermined value, during a data communication. A terminal receives the time alignment control signal on the forward control channel and time aligns a reverse traffic channel based on the received time alignment control signal.

Abstract: A method of providing a diversity of call services in a CDMA-2000 mobile communication system supporting a packet-based call service. The method provides a user with such a packet call service via an Internet Protocol (IP) based network and includes the steps of constructing a set of service primitive information including radio channel assignment information in accordance with at least one service class for the packet call service, determining a service primitive combination according to the service class of the packet call based on the service primitive information, assigning to the mobile terminal a radio channel corresponding to the service primitive combination, if a packet call for at least one mobile terminal is generated, and then providing the mobile terminal with the requested packet call service by using the assigned radio channel.

Abstract: A device and method for cancelling code interference in a receiver of a CDMA (Code Division Multiple Access) communication system simultaneously using orthogonal codes and quasi-orthogonal codes are provided. In a receiver according to an embodiment of the present invention, a channel estimator produces a channel estimation value of a pilot channel signal spread by an orthogonal code through despeading. A quasi-orthogonal channel receiver receives a channel signal spread by a quasi-orthogonal code, despreads the channel signal, demodulates the despread channel signal by use of the channel estimation value, and provides an output. An interference estimator estimates an interference value of the pilot channel signal with the channel signal spread by the quasi-orthogonal code by obtaining a correlation value between the orthogonal code corresponding to a pilot channel and the quasi-orthogonal code corresponding to a quasi-orthogonal channel.