Electronics and Telecommunications Research Institute

Pantech Co., Ltd.

Samsung Electronics Co., Ltd.

Eun-Hee Hyun

Young-Jick Bahg

Joon-Young Jung

Je-Won Lee

Heung-Mook Kim

Dong-Joon Choi

Cheol-Hye Cho

Tae-Kyoon Kim

Sung-Hee Kim

Disclosed herein is a method for receiving adaptive media streaming. The method may include calculating segment download time for each video quality level based on network throughput, a segment bitrate for the video quality level, segment duration, and a standard deviation of segment bitrates, determining a segment bitrate for maximizing the quality of viewing experience of a user based on the segment download time for each video quality level and a buffer level received from a playback buffer, making a request for the determined segment bitrate, transferring the request to a server, and transferring a corresponding video segment received in response to the request to the playback buffer.

Method and apparatus for receiving adaptive media streaming and adaptive media streaming system

Disclosed herein are a hybrid download method and apparatus for multiview streaming. The hybrid download method includes requesting a group download for an n−1-th segment from a server, playing an n−3-th segment at a viewpoint VP1 of a viewer, when a group download request for the n−1-th segment is completed, making a group download request for an n-th segment, when a change in a viewpoint of the viewer occurs at a time at which an n−2-th segment is played, playing a low-quality n−2-th segment at a viewpoint VP3, when the group download for the n-th segment is completed, requesting a single download for a high-quality n−1-th segment corresponding to the viewpoint VP3 from the server, and when the single download for the high-quality n−1-th segment corresponding to the viewpoint VP3 is completed, playing the high-quality n−1-th segment at the viewpoint VP3.

Hybrid download method and apparatus for multiview streaming, and multiview streaming system

Disclosed herein are a method for simultaneously transmitting/receiving upstream and downstream signals using a remote PHY architecture and an apparatus for the same. The method determines whether to divide frequencies depending on whether signal interference occurs among multiple cable modems connected to a cable network, if it is determined to divide the frequencies, categorize the multiple cable modems into multiple groups so that signal interference occurs in each group, but signal interference does not occur between groups, set transmission bands for the multiple groups so that an upstream band and a downstream band of one group alternate with upstream bands and downstream bands of remaining groups by dividing the frequencies in accordance with a number of groups, and cancels, by a remote physical layer (PHY) device located at an optical network terminal of the cable network, self-interference signals for respective groups based on the transmission bands.

Method for simultaneously transmitting/receiving upstream and downstream signals using remote PHY architecture and apparatus for the same

A data compression apparatus includes a lossy compression unit for calculating, in advance, a reference error vector magnitude depending on lossy compression and decompression by removing lower bits from a data signal composed of bitstreams, for setting removal target lower bits satisfying a preset error vector magnitude requirement, and for lossily compressing the data signal by removing the removal target lower bits from the data signal, and a communication unit for transmitting the compressed data signal to a data decompression apparatus.

Apparatus and method for data compression and decompression based on calculation of error vector magnitude

Disclosed herein are a method for transmitting and receiving compressed data and an apparatus therefor. According to the method for transmitting compressed data, a transmission apparatus for transmitting compressed data standardizes the value of an In-phase/Quadrature-phase (IQ) data sample to a preset type that is selected from among a positive number and a negative number, determines the sample type of the IQ data sample, the value of which is standardized to the preset type, based on a sample type determination rule, generates a compressed bit string based on the compression rule pertaining to the determined sample type, generates compressed data, including at least one of a reference bit corresponding to the sample type, the sign bit of the IQ data sample, and the compressed bit string, for each IQ data sample, and transmits the compressed data to a reception apparatus.

Method for transmitting and receiving compressed data and apparatus for the same

Disclosed are an SIP-based user mobility service providing apparatus and method using user position information obtained by a sensing apparatus. When a user enters a specific region, a gateway including a sensing management module carries out SIP registration for several terminals existing in the specific region in place of user agents of the terminals. The sensing management module transmits an SIP registration message to an SIP proxy server and notifies the terminals of the completion of SIP registration. Then, the user receives a call using the same kind of a terminal as a specific terminal previously set on the basis of a user's preferences among the terminals in the specific region.

SIP-based user mobility providing apparatus and method

Provided is a broadcast multicast service control system capable of distributively processing excessively given load under environments that have to offer MBMS service by linking with several mobile communication networks, and a control method thereof. The service control system provides a multimedia broadcast multicast service including a service announcement function of announcing service information, a security function of executing generation and distribution of keys for user authentication and information protection, and a proxy and transport function of transmitting/receiving control signals and traffics to/from a mobile communication network to provide the multimedia broadcast multicast service, and the service control system includes: a plurality of service control units, a load management unit, a service distribution policy management unit, and a processing load distribution policy management unit.

System for controlling multimedia broadcast multicast service for load distribution and control method thereof

There is provided a method for a multimedia broadcast/multicast service (MBMS) announcement to provide a service announcement document in a broadcast multicast service center (BM-SC) of a MBMS system, including the steps of: generating a service announcement document; searching a service announcement area; setting a session for providing the service announcement document to the searched service area by setting a MBMS multicast bearer; transmitting a corresponding service announcement document to the service announcement area, wherein the service announcement document includes an announcement area directories according to service announcement areas, and the announcement area directory includes service directories according to services provided to corresponding service announcement areas as a lower directory.

Method and system for service announcement using MBMS multicast bearer

The present invention provides a method which uses a data audit function in order to maintain a consistency about a plurality of data stored as a replication data among data base nodes consisting of a mobile communication system. The method for auditing data based on timestamp criteria in replicated data bases in a digital mobile telecommunication system includes the steps of: (a) when there is a database access request, setting a time stamp about tuple accessed by the request, and managing a start, suspend, stop and resume events for a audit process; (b) managing a current status of the audit process, and information necessary for scanning each tuple; and (c) managing a request queue for the data base and CPU load. Accordingly, the present invention satisfies a system basic requirement being a real-time access in a mobile communication system including at least two data bases, maintains a consistency between two data replicated to each other, accurately controls a relationship between a mobile subscriber and a mobile terminal, and removes the incorrect data and the garbage data which may occur in a system operation, thereby effectively using the data base resource.

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Daejeon, South Korea

Eun-Hee Hyun