Abstract: There is provided a method and apparatus for selecting an appropriate base station and an optimal data rate to provide a voice service and a data service based on a voice service load in a CDMA system. A base station transmits two pilot signals orthogonally spread with different orthogonal codes in association with its voice service load, and a mobile station estimates the voice service load based on a pilot power ratio.

Abstract: A communication method in a mobile communication system in which an access terminal transmits to an access network DRC information indicating a selected one of forward data rates requested by the access terminal is provided. The access network designates a DRC information length DRCLength indicating a number of slots where the DRC information is repeated and transmits the designated DRC information length to the access terminal. The access terminal gates transmission of DRC information to the access terminal at one time slot in every DRC information length received from the access network.

Abstract: An apparatus and method for gated transmission in a CDMA communication system. A mobile station in the CDMA communication system transmits a reverse pilot signal at a reverse gating rate different from a forward gating rate in a gated mode in a control hold state, and a base station transmits a forward pilot signal at the forward gating rate different from the forward gating rate in a gated mode.

Abstract: There is provided a method and apparatus for selecting an appropriate base station and an optimal data rate to provide a voice service and a data service based on a voice service load in a CDMA system. A base station transmits two pilot signals orthogonally spread with different orthogonal codes in association with its voice service load, and a mobile station estimates the voice service load based on a pilot power ratio.

Abstract: There is provided a data communication apparatus and method in a multi-carrier CDMA communication system. A transmitting device determines whether a supplemental channel is transmitted. If the supplemental channel is transmitted, the transmitting device assigns the supplemental channel to each of all FAs having different carrier frequency bands and the other channels including a fundamental channel, a dedicated control channel, and a common control channel to one of the FAs. A receiving device determines whether the supplemental channel exists in input channel signals. If the supplemental channel exists, the receiving device despreads supplemental channel signals in each of the FAs, connects the despread supplemental channel signals to a supplemental channel decoder, despreads the other channels in one of the FAs, and connects the other channel signals to corresponding channel decoders.

Abstract: A noise power measuring system and method for a base station receiver are disclosed. In the system and method, a received signal is despread and the noise power of the despread received signal is estimated. An orthogonal code generator generates a noise power measurement orthogonal code, which is orthogonal to all the orthogonal codes presently being used by the mobile station. A correlator connected to the orthogonal code generator performs a correlation operation between the noise power measurement orthogonal code and the despread received signal. A noise power measurer connected to the correlator, measures the noise power from the output of the correlator.

Abstract: Disclosed is a method for determining a forward data rate and a forward transmission power level in a mobile communication system. An access terminal measures a C/I of a forward pilot channel, determines a forward data rate by matching the measured C/I with a reference C/I, creates a difference between the measured C/I and the reference C/I as margin information, and transmits the determined forward data rate and margin information over a reverse transmission channel. Upon receipt of the forward data rate and margin information, an access network decreases a transmission power level by power corresponding to the margin information and performs forward transmission at the forward data rate at the decreased transmission power level.

Abstract: Disclosed is a method for determining a forward data rate and a forward transmission power level in a mobile communication system. An access terminal measures a C/I of a forward pilot channel, determines a forward data rate by matching the measured C/I with a reference C/I, creates a difference between the measured C/I and the reference C/I as margin information, and transmits the determined forward data rate and margin information over a reverse transmission channel. Upon receipt of the forward data rate and margin information, an access network decreases a transmission power level by power corresponding to the margin information and performs forward transmission at the forward data rate at the decreased transmission power level.

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 method and apparatus for controlling transmission of an RPC channel during a handoff in a mobile communication system, wherein. only one AN is selected among a plurality of ANs to transmit reverse power control information to an AT. For this purpose, a Forward Link Selection message received at an AN from an RNC. Alternatively, a DRC cover received at an AN from AT can be used. The DRC cover indicates at least one of ANs excluding an AN having the worst chennel condition for the AT.

Abstract: Disclosed is an apparatus for performing power control on a reverse channel quality indicator channel (CQICH) received from a mobile station by a base station in a mobile communication system including the base station for transmitting a power control bit for power control on reverse channels and the mobile station for controlling transmission power of the reverse channels according to the power control bit. An erasure detector determines whether to perform an erasure process by measuring reception power of the reverse channel quality indicator channel. An erasure rate calculator accumulates the erasure-determined result for N slots and calculates an erasure rate for the N slots. A control bit generator determines a ratio control bit to be transmitted to the mobile station according to the erasure rate, to issue a command to increase or decrease a CQICH traffic-to-pilot ratio.

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 method for assigning orthogonal codes used for a first system and a second system in a CDMA system including channels of the first system for spreading a pilot signal, a sync signal, a paging signal and a traffic signal with a first set of orthogonal codes corresponding to orthogonal code numbers in different rows from a set of orthogonal codes arranged in a matrix of m rows and m columns, and channels of the second system for spreading a second set of orthogonal codes corresponding to orthogonal code numbers different from said orthogonal code numbers for the first set of orthogonal codes. The orthogonal codes for the second system are transmitted at a data rate higher than a data rate of the first system.

Abstract: A communication method in a mobile communication system in which an access terminal transmits to an access network DRC information indicating a selected one of forward data rates requested by the access terminal is provided. The access network designates a DRC information length DRC Length indicating a number of slots where the DRC information is repeated and transmits the designated DRC information length to the access terminal. The access terminal gates transmission of DRC information to the access terminal at one time slot in every DRC information length received from the access network.

Abstract: Disclosed is a method for determining a forward data rate and a forward transmission power level in a mobile communication system. An access terminal measures a C/I of a forward pilot channel, determines a forward data rate by matching the measured C/I with a reference C/I, creates a difference between the measured C/I and the reference C/I as margin information, and transmits the determined forward data rate and margin information over a reverse transmission channel. Upon receipt of the forward data rate and margin information, an access network decreases a transmission power level by power corresponding to the margin information and performs forward transmission at the forward data rate at the decreased transmission power level.

Abstract: In a device for communicating data between a base station having at least two transmit antennas, and a mobile station having at least one receive antenna in a mobile communication system, the device includes: a transmitter at the base station, for inserting power control bit (PCB) patterns into the data and sending the data with the PCB patterns inserted therein, the PCB patterns indicating one transmit antenna being used to transmit the data; and a receiver at the mobile station, for receiving the data, detecting the PCB patterns from the received data and determining the one transmit antenna from the detected PCB patterns.

Abstract: An apparatus and method for transmitting forward link data to a handoff mobile station in a CDMA communication system. A service sector for the handoff mobile station registers the other sectors in the active set of the handoff mobile station as idle sectors upon request of a data service from the handoff mobile station, and transmits data traffic to the handoff mobile station, while the sectors designated as idle sectors discontinue transmission of data traffic and transition to an idle state.

Abstract: There is provided a method and apparatus for transmitting/receiving data rate control (DRC) information in a mobile telecommunication system for transmitting packet data. To determine a data rate on the forward link in a mobile telecommunication system such as an HDR system, DRC information is transmitted on the reverse link only in time for scheduling user data. An access network (AN) transmits a DRC request indicator (DRI) bit or an access terminal (AT) detects preambles of all users or its own preamble in order to control transmission of the DRC information. Along with the DRC information transmission control, some ATs are controlled to transmit pilot channels and RRI channels at different time points from other ATs. Therefore, interference load on the reverse link is reduced and the system capacity of the reverse link is increased.

Abstract: A method of adapting a mobile telecommunication system to channel conditions. To control transmission of a data packet from an access network (AN) in both a link adaptation scheme and an ARQ (Automatic Repeat reQuest) scheme, an access terminal (AT) compares the received power of a forward pilot signal received from the AN with a predetermined first threshold, checks errors in the data packet of a received time slot if the reception power is greater than the first threshold, and transmits a signal requesting termination of retransmission of the data packet to the AN if no errors are found in the data packet after decoding.

Abstract: There is provided a method and apparatus for selecting an appropriate base station and an optimal data rate to provide a voice service and a data service based on a voice service load in a CDMA system. A base station transmits two pilot signals orthogonally spread with different orthogonal codes in association with its voice service load, and a mobile station estimates the voice service load based on a pilot power ratio.