Abstract: A base station apparatus and method for estimating a velocity of a mobile station in a mobile communication system are provided. In the apparatus and 9 method, a channel estimator receives a signal on a radio channel from the mobile station and performs channel estimation using the received signal. A velocity estimator detects a power spectrum value of the channel estimator, and provides the channel estimator with a channel estimation coefficient for use during channel estimation according to a Doppler shift frequency value of power estimated from the mobile station when the velocity of the mobile station is unchanged.

Abstract: A Base Station (BS) apparatus for estimating a velocity of a Mobile Station (MS) in a mobile communication system includes a channel estimator for performing channel estimation according to a velocity band, receiving a wireless channel signal from the MS, and performing channel estimation using channel estimation coefficients optimized for individual velocity bands; and a velocity estimator for dividing the velocity band into a plurality of sub-Doppler bands, detecting a sub-Doppler band including a frequency index having a maximum frequency response from among the divided sub-Doppler bands, and transmitting information of the detected sub-Doppler band to the channel estimator such that a channel estimation coefficient corresponding to the information is transmitted.

Abstract: Apparatus and method are provided in a BS (Base Station) apparatus of a mobile communication system including a velocity estimator for estimating a velocity of a mobile station (MS) and a channel estimator for performing channel estimation using a plurality of channel estimation coefficients according to a control signal of the velocity estimator. The apparatus and method comprise estimating reception performance of individual channel estimation coefficients of the channel estimator, and selecting boundary frequencies of a plurality of Doppler frequency bands corresponding to a channel estimation coefficient having the best reception performance; measuring a power spectrum associated with a minimum number of frequency indexes capable of classifying the plurality of Doppler frequency bands; and controlling a detection position such that a Doppler frequency boundary value measured when a weight value is applied to the measured power spectrum approximates a desired Doppler frequency boundary value.

Abstract: An apparatus and method for transmitting and receiving a symbol through a reverse control channel in a mobile communication system for providing packet data are provided. When reverse traffic is present, the apparatus and method can effectively demodulate and decode the reverse traffic. In a method for transmitting a reverse channel in the mobile communication system capable of discontinuously transmitting packet data, a transmission is performed by setting power of a Data Rate Indicator (DRI) channel to a predefined power when packet data is transmitted. When no packet data is transmitted, a transmission is performed by decreasing the power of the DRI channel.

Abstract: An apparatus and method for receiving data in a mobile station for a mobile communication system using multi-user packet data are provided, in which a preamble power measurer measures preamble power of the multi-user packet data received from a base station and transmits the result value to a controller. The controller compares the measured power with a predetermined threshold, simultaneously decodes the multi-user packet data according to all transport formats if the measured power is lower than the threshold, and decodes the multi-user packet data according to a predetermined transport format if the measured power is higher than or equal to the threshold. A plurality of decoders decode the received multi-user packet data according to a control signal from the controller, wherein the number of the decoders depends upon the total number of transport formats for the multi-user packet data.

Abstract: A TDM (Time Division Multiplexing)-based mobile communication system that switches a service type according to QoS (Quality of Service). The mobile communication system includes a base transceiver system (BTS) and a mobile station (MS) connected to the BTS. The BTS monitors whether a first service provided from the BTS to the MS is satisfied according to whether at least as much data as a predetermined transmission amount is transmitted to the MS. If the first service is dissatisfied, the BTS switches a service to a second service lower in QoS than the first service so that as much data as a transmission amount smaller than the predetermined transmission amount is transmitted to the MS.

Abstract: A system includes a first base station (BS) adapted to generate, upon detecting an access request signal for a second BS and transmitted from a mobile terminal (MT), an access detection message indicating the detection, and a network element coupled between the first and second BS and adapted to receive the access detection message. The second BS is adapted to receive the access detection message from the network element.

Abstract: An apparatus and method for detecting a pilot signal in a mobile communication system are provided by which the processing time taken to demodulate a traffic channel based on a channel estimation result can be reduced, and thus, the size of a buffer for buffering signals until the presence of a secondary/auxiliary pilot signal is detected can also be reduced. The apparatus includes a first channel estimator for estimating a channel for a noise component of a pilot symbol received by a first receiver, a second channel estimator for adding a pilot symbol received by a second receiver and the pilot symbol received by the first receiver and estimating a channel for a noise component of the added pilot symbol, an energy detector for detecting an energy value of a pilot symbol using result values output from the first and second channel estimators, and a comparison and determination unit for determining whether or not there is a secondary/auxiliary pilot signal by using the detected energy values.

Abstract: A method for controlling power of a shared forward link data channel for multicasting in a mobile communication system. The method includes the steps of initializing a virtual gain for each mobile terminal with which the shared forward link data channel is established, receiving power control request information from each mobile terminal to adjust the virtual gain of each mobile terminal, selecting a largest virtual gain among the adjusted virtual gains as a control power value of the shared forward link data channel, and regulating the power of the shared forward link data channel to the selected control power value.

Abstract: A system and method for controlling congestion between response messages responsive to a group call page in a mobile communication system are provided. Efficient group call control is accomplished by transmitting a group call page message comprising a group call identifier to an access terminal through a control channel, and at the access terminal receiving the group call page message, applying a different response time according to a reception type of the group call page message to transmit a response message to the access network transceiver system.

Abstract: An apparatus and method for processing a call in a PTT system where, when an outgoing terminal transmits an invitation message for PTT service or for call setup to a predetermined incoming terminal in a dormant state, the outgoing terminal transmits the invitation message together with address information on the incoming terminal to enable a PTT server to detect the location of the incoming terminal before the invitation message is transmitted to the incoming terminal, thereby reducing the time taken to set up a PTT call.

Abstract: An apparatus and a method for detecting traffic channel signal transmission in a rake receiver may advantageously ensure stable and accurate detection performance in performing continuous/discontinuous transmission detection of traffic channels with a rake receiver in a mobile communication system based upon CDMA 2000 standards by making sufficiently spaced distribution in traffic channel signal-to-noise ratios estimated in continuous/discontinuous transmission. The method includes compensating traffic channel signals according to fingers, respectively, by using estimated pilot channel signals; combining the compensated finger-based traffic channel signals and estimating signal-to-noise ratios for traffic channels; and comparing the estimated signal-to-noise ratios with a preset threshold value, respectively, to detect continuous or discontinuous transmission of the traffic channels based upon comparison results.

Abstract: An apparatus and method for determining access power in a mobile communication system. The system includes a base transceiver station (BTS) for generating and transmitting a message field including access parameter information and BTS load information within an area covered by the BTS, and the mobile terminal for determining transmission power for access on a basis of power of a signal received from the BTS and the message field. The method includes the steps of generating a message field including access parameter information and BTS load information and transmitting the message field from the BTS to the mobile terminal within an area covered by the BTS, and determining transmission power for access in the mobile terminal on a basis of power of a signal received from the BTS and the message field.

Abstract: An apparatus and method for maximizing the efficiency of a power amplifier by reducing the PAPR of a BS in a mobile communication system. A power controller between I and Q channel pulse shaping filters and a frequency converter calculates cancellation signals for signal pulses that increase the PAPR at each sampling period, pulse-shape-filters cancellation signals at the highest levels among the cancellation signals, and adds the filtered cancellation signals to the original signals. Thus, spectral regrowth outside a signal frequency band is suppressed. In the case of a system supporting multiple frequency allocations, the PAPR is controlled for each FA according to its service class. Therefore, minimum system performance is ensured and power use efficiency is increased.

Abstract: An apparatus and method for controlling a forward data rate by an access terminal in a mobile communication system having at least one access terminal and an access point capable of performing packet data communication with the access terminal. The apparatus and method comprise receiving packet data information including a target packet error rate (PER) from the access point over a forward link channel and decoding the received packet data information; adjusting target PERs for respective data rate control (DRC) values according to the decoded packet data information; selecting one of the adjusted target PERs according to the decoded packet data information, and determining the selected target PER as a target PER for a DRC value to be transmitted; estimating a carrier-to-interference ratio (C/I) for the received packet data information; and determining a DRC value satisfying the determined target PER using the estimated C/I.

Abstract: Apparatus and method are provided in a BS (Base Station) apparatus of a mobile communication system including a velocity estimator for estimating a velocity of a mobile station (MS) and a channel estimator for performing channel estimation using a plurality of channel estimation coefficients according to a control signal of the velocity estimator. The apparatus and method comprise estimating reception performance of individual channel estimation coefficients of the channel estimator, and selecting boundary frequencies of a plurality of Doppler frequency bands corresponding to a channel estimation coefficient having the best reception performance; measuring a power spectrum associated with a minimum number of frequency indexes capable of classifying the plurality of Doppler frequency bands; and controlling a detection position such that a Doppler frequency boundary value measured when a weight value is applied to the measured power spectrum approximates a desired Doppler frequency boundary value.

Abstract: A Base Station (BS) apparatus for estimating a velocity of a Mobile Station (MS) in a mobile communication system includes a channel estimator for performing channel estimation according to a velocity band, receiving a wireless channel signal from the MS, and performing channel estimation using channel estimation coefficients optimized for individual velocity bands; and a velocity estimator for dividing the velocity band into a plurality of sub-Doppler bands, detecting a sub-Doppler band including a frequency index having a maximum frequency response from among the divided sub-Doppler bands, and transmitting information of the detected sub-Doppler band to the channel estimator such that a channel estimation coefficient corresponding to the information is transmitted.

Abstract: A method for controlling a Base Station (BS) to control a reverse data transfer rate in a mobile communication system includes the steps of: measuring a total user load value of a reverse link in a sector and an Rise Over Thermal (ROT) value; comparing the measured total user load value with a predetermined load threshold value, and comparing the measured ROT value with a predetermined ROT threshold value if it is determined that the measured total user load value is greater than the predetermined load threshold value; and increasing the data transfer rate if it is determined that the measured ROT value is less than or equal to the predetermined ROT threshold value.

Abstract: A base station apparatus and method for estimating a velocity of a mobile station in a mobile communication system are provided. In the apparatus and method, a channel estimator receives a signal on a radio channel from the mobile station and performs channel estimation using the received signal. A velocity estimator detects a power spectrum value of the channel estimator, and provides the channel estimator with a channel estimation coefficient for use during channel estimation according to a Doppler shift frequency value of power estimated from the mobile station when the velocity of the mobile station is unchanged.

Abstract: An apparatus and method for accurately measuring the thermal noise power of a silence period and increasing the control efficiency of reverse link load in a mobile communication system. In the received power measuring apparatus, a UPMB measures the received power of the reverse link, accumulates the measured received power, and outputs the accumulated received power as a received power value. A remover compensates the received power value using a time constant if the received power value is for a silence period. A controller provides a silence period signal to the remover when the silence period starts.