Samsung Electronics Co., Ltd.

Noh-Sun Kim

Yong-Suk Moon

Hun-Kee Kim

Jae-Seung Yoon

Gin-Kyu Choi

Jun-Sung Lee

Gin-Kyu Chol

Sung-Jin Kim

Yong-Suk Lee

Kang-Min Lee

Yu-Shin Kim

Jung-min Oh

Jin-Kyu Choi

Kyo-Sook Shin

Kyung-Hyun Palk

Chul-Hong Boo

Hee-Joon Chae

Hea-Kyoung Jung

Hung-Kee Kim

An apparatus and a method for scanning a network in a mobile communication terminal are provided. The method for scanning a network in a mobile communication terminal includes to configure a PLMN list based on a Subscriber Identification Module (SIM) card, to store scanned frequency information and corresponding PLMN information into a database by a previous scanning result, to compare the database with the PLMN list and to perform a scanning corresponding to frequency bandwidths included in the database or performing a scanning entire frequency bandwidths according to a result of comparison.

Apparatus and method for scanning network in a mobile communication terminal

A terminal and method are provided. The terminal includes an Absolute Radio Frequency Channel Number (ARFCN) table including at least one ARFCN information, and a controller for controlling a frequency scanning based on the ARFCN table to detect one or more ARFCNs from the ARFCN table and for controlling a camping on at least one of the detected one or more ARFCNs, such that the camping can be performed based on International Mobile Subscriber Identity (IMSI) information. The camping can be attempted without a scanning procedure for finding an available cell to reduce an amount of time for camping.

Terminal performing camping based on IMSI information and control method thereof

An apparatus and method for improving turbo code performance in a communication system are provided. In the apparatus, a bit inserter inserts a predetermined number of bits into a transmission information bit stream, if the effective coding rate of a transmission packet is a predetermined coding rate. A turbo encoder turbo-encodes a bit stream received from the bit inserter and outputting code symbols. A rate matcher matches the code symbols to a predetermined size.

Apparatus and method for improving turbo code performance in a communication system

Provided is an apparatus and method for preventing successive failures in a call connection in a mobile communication terminal. When a call connection is attempted, a cell with the highest RX power is selected among cells and an RRC Connection Request message is transmitted from the mobile terminal to a BS of the selected cell. It is determined whether the mobile terminal receives an RRC Connection Accept/Reject message from the BS. If the mobile terminal receives an RRC Connection Reject message from the BS of the selected cell, it is determined whether the selected cell is able to perform the RRC connection by detecting a Connection Reject message frequency that is the number of times of rejection of an RRC connection request for a predetermined period. If the selected cell is not able to perform the RRC connection, a neighboring cell is reselected and an RRC Connection Request message is transmitted to the reselected neighboring cell.

Apparatus and method for connecting call in mobile terminal

An apparatus and method for transmitting and receiving wireless packet data are provided. In a wireless packet data transmitter for transmitting to a wireless packet data receiver data packet on a transport channel and control information for supporting the transport channel on a control channel in a wireless packet data communications system, a padding bit eliminator eliminates optional padding bits of a variable size from a transport block for data packet transmission. A transport channel encoder for transport channel-encodes the transport block without the padding bits and transmits the encoded transport block on the transport channel. A control channel encoder control channel-encodes the control information including a padding bit number indicator indicating the number of the eliminated padding bits and transmits the encoded control information on the control channel.

Apparatus and method for transmitting and receiving wireless packet data

Provided is an apparatus and method for transmitting/receiving an HS-SCCH in a wideband wireless communication system. In a method for transmitting control information in an HARQ wireless communication system, an ACK/NACK fed back from a receiver is monitored to determine if an ACK/NACK repetition factor needs to be adjusted. If the adjustment is needed, the ACK/NACK repetition factor is determined. Control information corresponding to the ACK/NACK repetition factor is transmitted to the receiver over a predetermined control channel. A Node B capable of directly detecting the uplink channel conditions, adjusts the ACK/NACK repetition factor and the adjusted ACK/NACK repetition factor is rapidly transmitted to a UE.

Apparatus and method for transmitting/receiving high speed shared control channel in wideband wireless communication system

A method for controlling transmission power of a physical random access channel in a mobile communication terminal. The mobile communication terminal sets initial transmission power according to received signal code power when a preamble of the physical random access channel is transmitted to a mobile communication network. A wireless channel environment is identified on the basis of a value of the received signal code power when the preamble must be retransmitted. According to the identified wireless channel environment, transmission power used in a previous preamble is variably increased and retransmission power is set.

Method for controlling transmission power of a physical random access channel

A transmitting/receiving apparatus and method for packet retransmission in a mobile communication system. Upon request for a retransmission from a receiver, a transmitter inverts initially transmitted coded bits if the retransmission is odd-numbered for the same data, modulates the inverted bits, and transmits the modulated bits to the receiver. Then the receiver recovers the coded bits by demodulation. If the coded bits are retransmitted an odd number of times, the receiver decodes the coded bits after inversion. Thus the error probabilities of initial transmission bits and retransmission bits are averaged in effect and decoding performance is improved.

Transmitting/receiving apparatus and method for packet retransmission in a mobile communication system

Disclosed is a data transmission/reception apparatus and method for minimizing decoding errors during high-speed packet transmission in a CDMA mobile communication system. When retransmitting data in the Hybrid Automatic Repeat Request ('H-ARQ') technique, the data transmission/reception apparatus and method performs symbol mapping on coded bits to be retransmitted by allocating different reliabilities to the coded bits according to the number of retransmissions, thus resulting in an improvement of system performance.

Apparatus and method for transmitting and receiving data in a CDMA mobile communication system

An apparatus and method for transmitting/receiving data using a multiple antenna scheme in a mobile communication system are provided. First and second code symbol sequences are generated by encoding a data symbol sequence for transmission in a predetermined encoding method. Transmission of the two code symbol sequences through the first and second transmit antennas is controlled such that if the data symbol sequence is initially transmitted, the first code symbol sequence is transmitted through the first transmit antenna and the second code symbol sequence is transmitted through the second transmit antenna and, if the data symbol sequence is retransmitted, the first code symbol sequence is transmitted through the second transmit antenna and the second code symbol sequence is transmitted through the first transmit antenna.

Apparatus and method for transmitting/receiving data using a multiple antenna diversity scheme in a mobile communication system

A bit scrambling method and apparatus for packet transmission/reception in a wireless communication system are provided. A transmitter performs bit scrambling before CRC attachment and a receiver performs bit descrambling after a CRC check. This enables termination of iterative decoding at a turbo decoder according to the CRC check. Hence, power consumption is reduced and throughput is increased at a receiver.

Method and apparatus for bit scrambling for packet transmission/reception in a wireless communication system

Disclosed is an adaptive channel estimator for improving a performance of a general channel estimator in a mobile communication system, and a method for controlling the same. The adaptive channel estimator further detects a noise level of a channel and a channel speed, and implements an optimum noise elimination filter on the basis of the detected noise level and channel speed. A comparison between mapping degrees predetermined by the detected noise level and channel speed allows an optimum noise elimination filter to be implemented, If such a channel estimator is implemented, then optimum packet data transmission is available for not only a low-speed channel but also a high-speed channel. A channel compensation caused by a difference between a spreading factor (SF) of a pilot channel and a spreading factor (SF) of a data channel can be compensated on the condition that a slope compensator executed by a SF ratio is controlled by a filter coefficient controller.

Apparatus and method for performing adaptive channel estimation in a mobile communication system

Apparatus and method are disclosed for selecting a transmit antenna diversity scheme according to a variation speed of a fading channel in a mobile communication system. A user equipment (UE) estimates a channel response of a pilot channel by receiving a pilot channel signal from a Node B; estimates a variation speed of a fading channel by using the estimated channel response and determining a transmit antenna diversity scheme suitable to the variation speed of the fading channel; and transmits feedback information including the determined transmit antenna diversity scheme to the Node B, so that the Node B can determine a transmit antenna diversity scheme for a channel signal to be transmitted to the UE based on the transmit antenna diversity scheme information included in the feedback information. In this way, the Node B adaptively applies a transmit antenna diversity according to a channel condition.

Adaptive transmit antenna diversity apparatus and method in a mobile communication system

A transmitting/receiving apparatus and method for packet retransmission in a mobile communication system. Upon request for a retransmission from a receiver, a transmitter generates first coded bits by inverting initially transmitted coded bits, generates second coded bits by separating the initially transmitted coded bits into a first bit group having a relatively high priority and a second bit group having a relatively low priority and exchanging the first bit group with the second bit group, and generates third coded bits by inverting the exchanged coded bits. The transmitter selects one of the first coded bits, the second coded bits according to the sequence number of a retransmission request received from the receiver, and the third coded bits and maps the selected coded bits to modulation symbols. The transmitter then transmits the modulation symbols to the receiver.

Growing community of inventors

Suwon-si, South Korea

Noh-Sun Kim