Sk Telecom Company, Ltd.

Seongsoo Park

Donghahk Lee

Sehyun Oh

SeongKeun Kim

Daesic Woo

Myungsung Lee

Sangshin Lee

Wonsuk Chung

Joosik Lee

Jongtae Ihm

Jaehwang Yu

Heehyeok Hahm

Jinsung Cho

Intae Ryoo

Donghahk 809-1101 Imaechon Jinheung Apt Lee

Wonsuk 204-1905 Dongsomun Hanjin Apts Chung

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 is a method for providing a multimedia Ring Back Tone (RBT) service by using a receiver-side switching center, which comprising the steps of: (a) receiving an ISDN User Part (ISUP) call connection request message including information (multimedia codec information) regarding a multimedia codec from a caller-side switching center when the originating terminal attempts a call connection to a terminating terminal; (b) transmitting the ISUP call connection request message including the multimedia codec information to a sound source-providing server; (c) requesting the caller-side switching center to set the multimedia codec, thereby activating a routing path for the RBT service; and (d) receiving a RBT sound source selected using the multimedia codec information from the sound source-providing server and transmitting the RBT sound source to the caller-side switching center.

Method and system for providing multimedia ring back tone service by using receiver-side switching center

Disclosed is a method, a system, and an apparatus for providing a sound source, which has been encoded by using an audio codec, as a ringback tone alternative having an improved quality by adaptively applying various audio codecs according to the service type so that, when a mobile communication terminal is provided with a ringback tone alternative by separately applying an audio codec and a voice codec to a ringback tone provision section and a voice communication section, respectively, it is unnecessary to individually and additionally change or modify a number of devices in a mobile communication network, but a specific device in an intelligent network controls other devices based on overall consideration of the ability of the mobile communication terminal, the type of the ringback tone alternative, etc.

Method, system and apparatus for providing alternative multimedia ring back tone substitute service by using intelligent network

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 acquiring an Access Network Identification (ANID) of a currently connected portable Internet network when a mobile communication terminal connects to the portable Internet network. The method includes the steps of (a) receiving an MAC management message from a base station when the mobile communication terminal connects to the portable Internet network, (b) extracting a base station identification from the MAC management message, and (c) acquiring the ANID for identifying the network to which the mobile communication terminal has connected from the base station identification. According to the method, access network information of a portable Internet network is transferred to a different type of network when the portable Internet network inter-works with said different type of network, so that network information of a portable Internet system can be acquired.

Method and system for providing interworking with portable internet network and other kinds of networks

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.

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Seoul, South Korea

Seongsoo Park