摘要:
A method for performing data communication in a mobile communication system is disclosed. The method serves to increase channel efficiency by connecting and releasing channels in accordance with the presence/absence of control and traffic data transmitted during packet data communications. Transmission power and mobile terminal battery power are conserved by controlling outputs of a dedicated control channel and a pilot channel when data transmission is discontinued temporarily during data communications. The mobile communication system includes an active state in which user data is transmitted through a dedicated traffic channel and control messages are transmitted through a dedicated control channel. In accordance with the method, a transition is made from the active state to a first control hold state when there is no control or user data to transmit for a first preset time. In the first control hold state, the dedicated traffic channel is released while the dedicated control channel and a reverse pilot channel are maintained. A transition is made from the first control state to a second control hold state when there is no user or control data to transmit for a second preset time. In the second control hold state, which is a resource save sub-state, the transmission outputs of the dedicated control channel and reverse pilot channel are interrupted to conserve power.
摘要:
A CDMA communication system provides a dedicated control channel capable of efficiently communicating control messages between a base station and a mobile station. In a dedicated control channel transmission device, a controller determines a frame length of a message to be transmitted and outputs a frame select signal corresponding to the determined frame length. A message generator generates frame data of the message to be transmitted according to the frame select signal. A transmitter spreads the frame data and transmitting the spread frame data through a dedicated control channel. In a dedicated control channel reception device, a despreader despreads a received signal. A first message receiver deinterleaves and decodes the despread signal in a first frame length to output a first message, and detects a first CRC corresponding to the decoded signal. A second message receiver deinterleaves and decodes the despread signal in a second frame length to output a second message, and detects a second CRC corresponding to the decoded signal. A controller selects one of the first and second messages according to first and second CRC detection results.
摘要:
A device and method for generating a pseudo-orthogonal code for use in orthogonally spreading channel data in a CDMA mobile communications system. M orthogonal codes are selected from N orthogonal codes, for forming a pseudo-orthogonal codes, and the elements of the selected M orthogonal codes are sequentially interlaced to generate the pseudo-orthogonal code as a sequence of M×N elements.
摘要:
A device for generating quasi-orthogonal codes which allow the minimum interference with orthogonal codes in a mobile communication system using the orthogonal codes. The device includes a first spreader for spreading at least one input signal with quasi-orthogonal codes, a second spreader for spreading another input signal with Walsh codes, and a PN (Pseudo-Noise) spreader for complex-spreading output signals of the first and second spreaders with PN sequences. The quasi-orthogonal codes are characterized in that a partial correlation value with the Walsh codes does not exceed a lowest partial correlation limit value.
摘要:
An echo canceler for canceling an echo signal mixed in an input signal received from a hybrid circuit. The echo canceler has a double filter structure comprised of an adaptive filter and a fixed filter. The adaptive filter receives the input signal to generate a first echo estimation signal according to a filter coefficient thereof, and the fixed filter receives the input signal to generate a second echo estimation signal according to a filter coefficient thereof. A first adder subtracts the first echo estimation signal from the input signal to generate a first echo-canceled signal, and a second adder subtracts the second echo estimation signal from the input signal to generate a second echo-canceled signal. A mode selector selectively outputs one of the first and second echo-canceled signals having a relatively more canceled echo component.
摘要:
A method for providing an Internet service based on location information of a subscriber station in a communication system. The Internet service method includes, upon receipt of a search request from a subscriber station, determining whether a network accessed by the subscriber station can support a Universal Service Interface (USI), acquiring location information of the subscriber station if the network accessed by the subscriber station can support the USI, and providing an Internet service based on the acquired location information of the subscriber station to the subscriber station.
摘要:
A system and method provide calling and called terminals with multimedia alerting signals such as a ringtone and ringback tone. When desiring to receive first multimedia portal contents as a multimedia alerting signal, the calling terminal presets the first multimedia portal contents and makes a call connection setup request. When desiring to provide second multimedia portal contents as a ringback tone, a called terminal presets the second multimedia portal contents and notifies that the ringtone and ringback tone are set. A Personal Internet Protocol Multimedia Subsystem (IMS) Portal (PIP) server receives call connection setup-related signals from the calling and called terminals, decides to provide particular multimedia portal contents as the ringback tone according to a predefined priority decision criterion when the calling and called terminals set the multimedia portal contents, and provides the set multimedia portal contents.
摘要:
A data transmission method for a high-speed packet access system includes: sending, by a user equipment, packet data containing scheduling information having size information of a packet buffer through an uplink channel to a base station, and sending quality indicator information and acknowledgement information through another uplink channel to the base station; determining, by the base station, the value of a turbo mode flag by comparing amounts of data stored in the packet buffer of the user equipment and a packet buffer of the base station respectively with preset thresholds; and deactivating, by the user equipment when the turbo mode flag of an order message contained in received control data, packet data reception and control data transmission, and redirecting transmit power of a specified transmitter to a packet data transmitter to increase transmit power of the packet data transmitter for faster packet data upload.
摘要:
A base station includes a center frequency setting unit, a local oscillator, a baseband processor, and an RF processor. In the event of a frequency band change, the center frequency setting unit sets a center frequency of a use frequency channel to have a predetermined offset value with respect to a center frequency before the frequency band change. The local oscillator generates an LO frequency signal according to the center frequency set by the center frequency setting unit. The baseband processor generates a downlink baseband signal. The RF processor uses the LO frequency signal to convert the downlink baseband signal into an RF signal prior to transmission.
摘要:
A system and method for providing a service in a communication system are provided, in which upon receipt of a request for provisioning of the service with a requested QoS class from an MS, a service server transmits a QoS information request message to an interface server and, upon receipt of a QoS information response message for the QoS information request message from the interface server, the service server provides the service with the requested QoS class to the MS.