Samsung Electronics Co., Ltd.

Si-Hai Wang

Chang-Hyun Lee

Sung-Kee Kim

Tae-sung Park

Yong-gyoo Kim

Do-young Joung

Jae-Hoon Kwon

Yun-Je Oh

Seong-Taek Hwang

Hoon Tae Kim

Jae-sung Park

Jae-hun Cho

Jae-Hun Cho

A cross-layer optimization method for controlling a bit rate of a video coder/decoder (codec) in video data transmission for wireless devices such as a wireless broadband (WiBro) system terminal that adapts to changing transmission/reception characteristics and usage. The method typically includes checking, by a sender, radio channel state information of a sender side and a receiver side; determining, by the sender, a transmission bit rate of a video codec by using the radio channel state information of the sender side; and adjusting, by the sender, the transmission bit rate of the video codec by using the radio channel state information of the receiver side when a communication network used by a receiver typically based on the type of a communication network being used by the sender.

Cross-layer optimization method for controlling bit rate of video codec in transmission of video data in WiBro system

A method for setting an output bit rate for video data transmission in a WiBro system in which an uplink state value for a predetermined unit time is calculated to determine an uplink network state of the predetermined unit time. An average of uplink state values for a predetermined number of unit times is calculated, and a video encoding bit rate is increased if the average of the uplink state values is larger than a predetermined first threshold. However, the video encoding bit rate is decreased if the average of the uplink state values is less than a predetermined second threshold.

Method for setting output bit rate for video data transmission in a WiBro system

A method for time synchronization in a distributed control system includes the steps of: when a sync is received from a master-side, confirming both a reception time point of the corresponding sync and a compensation time point of a previous frequency, and determining if a result obtained by confirming the two time points corresponds to a preset Frequency Compensation Interval (FCI); performing only a time offset compensation operation when the result obtained by confirming the two time points does not correspond to the preset FCI; and performing both time offset and frequency compensation operations when the result obtained by confirming the two time points corresponds to the preset FCI.

Method for time synchronization in distributed control system

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Suwon-si, South Korea

Si-Hai Wang