Sk Telecom Company, Ltd.

Samsung Electronics Co., Ltd.

Transono Inc.

Seong-Soo Park

Dong-Hahk Lee

Dong-Ho Cho

Sun-Mi Kim

Dong Gyung Ha

Jae Hoon Song

Seong Il Jeong

Hyeon-Woo Lee

Jong-Tae Ihm

Sang-shin Lee

Sang Shin Lee

Yong-Sik Shin

In-Hong Lee

Duk-Kyung Kim

Jin-Ick Lee

Ra-Mi Lee

Jae-Hwang Yu

Chan-Jeom Phang

Jin-Ho Cho

Disclosed are a voice communication system and a voice communication method which set a subtraction weight for each of a plurality of frequency subbands split based on a particular frequency response characteristic set to the system, calculate a gain function for each frequency subband according to the particular frequency response characteristic based on the subtraction weight for each of the frequency subbands, and improve sound quality of a voice signal by reflecting the calculated gain function.

System and method for improving sound quality of voice signal in voice communication

Disclosed are a method of scheduling traffic at a home node and an apparatus employing the same. The home node integrated with the femtocell function to interwork with a mobile phone, the home gateway function to control electronic devices, and a set-top box function schedules traffic data transmission according to the characteristics of available services, thereby ensuring the optimum QoS (Quality of Service) according to the service characteristics. Accordingly, the QoS of mobile communication services requiring real time is ensured independently from that of Internet application services. Priorities are assigned to Internet application services according to the characteristics thereof, so that data requirements are satisfied according to services.

Method for scheduling traffic of home node, and applied to the same

Disclosed is the system and method to remove noises in voice signals in a voice communication. The at least one embodiment of the present disclosure performs a spectral subtraction (SS) for voice signals based on a gain function by a spectral subtraction apparatus, performs clustering of voice signals consecutive on a frequency axis of a spectrogram for the voice signals in which the spectral subtraction has been already performed to designate one or more clusters, and extracts musical noises by determining continuity of each of the designated clusters on the frequency axis and a time axis of the spectrogram to extract musical noises.

Noise removing system in voice communication, apparatus and method thereof

Disclosed is a method and system for estimating an adaptive joint channel in a CDMA system based on TDD. The method includes the steps of a) receiving activity information of a mobile terminal; b) parsing the activity information, and transmitting a midamble sequence to the mobile terminal when a result of the parsing shows that the mobile terminal is in an ON state; c) conducting adaptive joint channel estimation by using the midamble sequence in the mobile terminal; and d) conducting adaptive joint detection by using a channel impulse response of the mobile terminal, obtained as a result of conducting the adaptive joint channel estimation. The method and system decreases the complexity in channel estimation and additionally increases the accuracy of channel estimation by reducing transmission power consumption and eliminating unnecessary interference.

Method and system for estimating adaptive combined channel in CDMA system based on time division duplex system

In the data call handover method, the mobile communication terminal registers a Mobile Internet Protocol (MIP address) through an asynchronous mobile communication network and receives data call service when a data call connection event is initiated by the mobile communication terminal. It is determined whether the mobile communication terminal has entered an area in which the asynchronous mobile communication network and a synchronous mobile communication network overlap. If the mobile communication terminal has entered the overlap area, it is determined whether to perform handover to the synchronous mobile communication network based on the intensity of a signal of the asynchronous mobile communication network. If handover is to be performed, a data call between the mobile communication terminal and the synchronous mobile communication network is established and the MIP address is registered. The service of the data call, which is provided by the asynchronous mobile communication network, is linked with the service of the synchronous mobile communication network. The data call between the mobile communication terminal and the asynchronous mobile communication network is released.

Controlling method and data call handover method for dual band/dual mode mobile communication terminal

The present invention discloses an apparatus and method for deciding an access system based on WLAN signal strength in a WLAN/mobile phone network interworking system, and a mobile terminal therefor. The method for deciding the access system based on the WLAN signal strength in the WLAN/mobile phone network interworking system includes an initialization step for performing an initialization process on a WLAN driver module and a mobile phone network driver module, and measuring and displaying WLAN signal strength, a service decision step for selecting a WLAN service or mobile phone network service according to the measured WLAN signal strength, and a service access step for enabling the corresponding driver module to access the service decided in the service decision step. The apparatus and method for deciding the access system based on the WLAN signal strength provide a roaming service by efficiently interworking a WLAN which provides a high speed internet access service based on hot spots and a mobile phone network which provides a national communication service, to facilitate activation of the wireless internet service.

Apparatus and method for deciding access system based on WLAN signal strength in WLAN/mobile network interworking system, and mobile terminal therefor

A handover method in wireless telecommunication system supporting USTS is disclosed. The method for performing a handover of a mobile station in an asynchronous wireless telecommunication system supporting an uplink synchronous transmission scheme (USTS) mode, includes the steps of: a) performing a mode conversion of the mobile station from the USTS mode to a non-USTS mode based on a first signal measurement result from the mobile station; and b) performing a handover for the mobile station. In another embodiment of the present invention, the method further includes the step of: c) performing a mode conversion from the non-USTS mode to the USTS mode based on a second signal measurement result from the mobile station.

Handover method in wireless telecommunication system supporting USTS

A method for controlling channel access in a mobile communication system. A base station generates a broadcast channel frame, which includes status information indicating whether channel codes which are changing in real time are occupied or not. The base station transmits the broadcast channel frame at predetermined intervals. Then, a mobile station selects an available channel code based on information from the received broadcast channel frame, generates a channel assignment request message, and transmits the channel assignment request message on a random access channel. Upon reception of the channel assignment request message on the random access channel, the base station assigns a channel, sets a transmission rate, and transmits the information on a forward access channel.

Packet data communication device and method in mobile communication system

A channel access control device and method are provided in which a base station reserves a specific access slot for a mobile station when the mobile station has data to transmit which exceeds one frame in length. The base station receives channel access information from the mobile station via a reverse access channel; and examines a length of transmission data, included in the received channel access information, to determine whether the transmission data continues in at least one succeeding frame; and reserves a specific access slot on the reverse access channel for the mobile station via a forward access channel when the data continues in the at least one succeeding frame.

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Seoul, South Korea

Seong-Soo Park