Sk Telecom Company, Ltd.

Sehyun Oh

Seongsoo Park

SeongKeun Kim

Myungsung Lee

Jongtae Ihm

Donghahk Lee

Daesic Woo

Hojin Yang

Seongho Ha

Sung Jin Kim

Wonsuk Chung

Jonghoon Park

Namgyu Kim

Gyuyoung Han

Sangyun Lee

Chaehwan Cho

Sangshin Lee

Jungbae Moon

Seunghwan Kwak

Jaehwang Yu

Kihak Shim

Heehyeok Hahm

Jungpyo Han

Disclosed herein is a fast data call connection method capable of reducing a connection time and increasing the probability of connection success in a CDMA 2000 network. In the fast data call connection method of the present invention, the PDSN transmits a data call connection request message, including an authentication type and a challenge value, to the MS. The MS transmits a data call connection response message, including a response to the challenge value, to the PDSN. The PDSN performs authentication with reference to the data call connection response message, and transmits a data call connection complete message to the MS if authentication succeeds. Accordingly, the present invention is advantageous in that it can reduce connection time, can increase the probability of connection success, and can guarantee compatibility by checking the MS version before a data call connection process is executed.

Fast data-link connection method for saving connection time in CDMA 2000 network

Disclosed is a method and a system for providing a terminal-based ringback tone substitute service, as well as a mobile communication terminal for the same. The method includes the steps of (a) receiving a request for an originating call for voice communication with a called terminal from a calling terminal; (b) transmitting a ringback tone start message to the calling terminal, the ringback tone start message being a control message informative of beginning of a ringback tone section; (c) paging the called terminal; (d) transmitting a ringback tone termination message to the calling terminal, the ringback tone termination message being a control message informative of ending of the ringback tone section, and connecting the voice communication between the calling terminal and the called terminal when a response to paging is received from the called terminal; and (e) transmitting the ringback tone termination message to the calling terminal and transmitting unanswered messages to the calling terminal when no response to the paging is received from the called terminal. The mobile communication terminal can play a high-quality ringback tone substitute without being affected by the voice channel environment.

Method and system for ring back tone alternative service based on terminal and mobile communication terminal therefor

Disclosed is an audio data packet format for transmitting an MPEG-4 HE-AAC frame via a voice channel of a mobile communication network, a method for decoding the audio data packet format, a method for correcting a codec setup error by identifying a codec used to encode sound source data inserted into a data field of voice slot data, based on the sequence number of the voice slot data, and correcting the codec setup error when a codec set up in a mobile communication terminal is different from the codec used to encode the sound source data, and a mobile communication terminal adapted to correct a codec setup error.

Audio data packet format and decoding method thereof and method for correcting mobile communication terminal codec setup error and mobile communication terminal performance same

Disclosed are a method and a system for providing a mobile communication terminal with network-based location measurement by using a G-pCell database. The method and system are advantageous in that, when a mobile communication system employs a network-based location measurement scheme, the influence of repeaters is reduced to improve the positioning stability and measurement accuracy and provide more stable location-based services.

Method and system for providing location measurement of network based to mobile communication terminal by using G-pCell database

Disclosed is a method and a system for setup of a multimedia codec and a voice codec between a mobile phone system and a terminal, in providing a multimedia RBT service capable of operating a multimedia codec allowing high quality music playback during an RBT interval and operating a voice codec such as an Enhanced Variable Rate Codec (Hereinafter, referred to as EVRC) during voice communication when an originating terminal supports the multimedia codec capable of improving the music quality in addition to a dedicated voice codec such as the EVRC.

Method and system for terminal codec setup of multimedia ring back tone service

Disclosed is a method for controlling a terminal for a multimedia Ring Back Tone (RBT) service, which allows RBT sound sources previously set in a sound source-providing server by a called subscriber to be reproduced to an originating terminal by means of a Home Location Register (HLR) and the sound source-providing server for storing the RBT sound sources when a calling subscriber telephones the called subscriber, the HLR storing profile information including whether the subscriber has joined the RBT service. The method includes the steps of: (a) receiving a codec setup message including information (multimedia codec information) regarding a multimedia codec from a switching center; (b) deactivating a decoding function of a voice codec; (c) activating a decoding function of the multimedia codec; (d) receiving the RBT sound sources; and (e) decoding the RBT sound sources through the multimedia codec and reproducing the decoded RBT sound sources.

Terminal for multimedia ring back tone service and method for controlling terminal

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Seoul, South Korea

Sehyun Oh