558 results about "Back channel" patented technology

A method for delivery and presentation of content-relevant information associated with frames in an AV program enables TV viewers to retrieve information on the contents (for example, objects, items, concepts and the like) associated with a frame or a set of frames (video segments) when they watch TV or video programs. The information relevant to frame(s) is delivered to a STB or DVR by third-party service providers through back channels such as the Internet if the information of how to accurately access the frames pointed by STB users are delivered to the service providers, and the content-relevant information may be presented in the form of a GUI for the TV viewer.

A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE.

A method and apparatus for providing a user input back channel (UIBC) in an audio/video (AV) source device and an AV sink device communicating according to a wireless fidelity (Wi-Fi) display (WFD) standard is provided. The method includes: setting up an AV control session and an AV data session between the AV source devices according to the WFD standards; enabling the UIBC from the AV sink device to the AV source device by using the AV control session; and transmitting a user input from the AV sink device to the AV source device through the UIBC.

In a closed-loop wireless communication system (200), channel-side information—such as CQI information, rank adaptation information or MIMO codebook selection information—is randomly or autonomously fed back to the transmitter (202) by having the receiver (206.i) initiate the feedback instead of using a scheduled feedback approach so that all receiving devices do not simultaneously feed back channel-side information to the transmitting device. The receiver (206.i) uses one or more antennas (209.i) to feed back channel-side information using data non-associated control multiplexing with uplink data and without uplink data, such as by using a contention-based physical channel or a synchronized random access channel.

A network-based video encoding and decoding system encodes and decodes remotely displayed user application data on a centralized desktop computer. Remotely displayed user application data are screen captures of a browsing application run by the centralized desktop computer on user's behalf. The encoding system optimizes its encoding performance using back channel information which includes real time network capacity information and decoder feedback. The encoding system consults a back channel information manager to dynamically adjust encoding parameters. Based on the real time network capacity information received, the encoding system adjusts its capturing sampling rate. Based on encoding errors identified by the decoding system, the encoding system selectively re-send previously encoded frames/blocks, or send intra frames on demand to allow the decoding system to correct encoding errors. In response to encoding customization requests from the decoding system, the encoding system adjusts its encoding parameters to meet such requests.

Channel doping is an effective method for controlling Vth, but if Vth shifts to the order of -4 to -3 V when forming circuits such as a CMOS circuit formed from both an n-channel TFT and a P-channel TFT on the same substrate, then it is difficult to control the Vth of both TFTs with one channel dope. In order to solve the above problem, the present invention forms a blocking layer on the back channel side, which is a laminate of a silicon oxynitride film (A) manufactured from SiH4, NH3, and N2O, and a silicon oxynitride film (B)manufactured from SiH4and N2O. By making this silicon oxynitride film laminate structure, contamination by alkaline metallic elements from the substrate can be prevented, and influence by stresses, caused by internal stress, imparted to the TFT can be relieved.

Various embodiments are described to coordinate a wireless network over a power line network or other wired back channel.

There is disclosed a method of a user equipment feeding back channel state information in a wireless communication system, comprising receiving a reference signal from a base station; generating first channel state information by measuring the reference signal; generating second channel state information based on the first channel state information; and transmitting the first channel state information and the second channel state information to the base station. The first channel state information is channel state information of a single user single cell Multi-input Multi-Output (MIMO) mode, and the second channel state information is channel state information of a multi-user MIMO (MU-MIMO) mode or a Cooperative Multiple Points Transmission and Reception (CoMP) mode.

A videoconference system is provided. The videoconference system includes a plurality of clients. A server component configured to distribute media to the plurality of clients is included. The server component includes a media mixer enabling distribution of a composite audio/video data stream to the client component and a videoconference choreographer configured to assist the media mixer in mixing input streams to the server component based upon event data. A conference channel communication connection over which video and audio data streams are carried between the plurality of clients and the server component is provided. A back-channel communication connection over which the event data is communicated between the plurality of clients and the server component is also included. A method for controlling mixing of data streams for a videoconference session is also provided. A scheme for converting documents to be shared during a videoconference session to a common format is also provided.

The invention discloses a communication method and wireless communication system for realizing multi-user dispatching. The method comprises the following steps: refining and multiplexing are carried out on physical resources in the wireless communication system so that multiple users can simultaneously access the physical resources in parallel; downlink transmission is carried out based on orthogonal frequency division multiple access (OFDMA) and multi-user-multiple-input and multiple-output (MU-MIMO) mechanism, and uplink transmission is carried out based on OFDMA or OFDMA+time division multiple access (OFMA+TDMA); an access point sends a multi-user polling frame or channel detection frame which carries an uplink transmission resource indication; a user station transmits data and feeds back channel status information according to the resource indication; and the system selects a user group for downlink data transmission and sends data to the users in the user group. According to the invention, a media access control (MAC) layer dispatching mechanism allowing multiple users to access simultaneously is achieved, and uplink and downlink services are comprehensively considered to realize two-way communication in the wireless communication system, thus the access delay can be obviously reduced, the system throughput can be obviously improved, and the requirement of accessing more multi-media services can be met.

A multi-participant videoconference system incorporating a back-channel connection and a client video mixer is disclosed. The multi-participant videoconference system includes a client component and a server component. The server component provides a composite conference video signal to the client component. A region is defined in the composite conference video signal and the size and coordinates of the region are communicated to the client component by the server component over the back-channel. The client component captures local video and mixes local video into the composite conference video signal using the size and coordinates received from the server component for display.

A system, method and data structure for error correction for use in the transmission of content data distribution networks uses a compressed memory, for example a bitmap, to identify portions of transmitted content data files where transmission errors have occurred. The error memory, is used to generate an error status report that is returned to a transmission controller via a low bandwidth back channel, for example the Internet. The information in multiple error status reports is aggregated by the control system of the transmitter and used to re-transmit those portions of previously transmitted content data files that were not properly received due to error. By re-transmitting only the data packets of the transmitted content data files that contain errors, overall transmission speed is increased and bandwidth usage is conserved.

Displaying the numbers of viewers who are watching currently-broadcasted television programs on electronic program guides (EPGs) using information gathered via back channels from home entertainment systems. A signal source transmits a television broadcast signal to televisions used by viewers. Processing devices associated with the televisions determine which program is being displayed and transmit this information to a central server using a back channel from the home entertainment system. Viewing behavior information is gathered from a large number of viewers and is compiled into a report that is transmitted to the individual processing devices of the home entertainment systems. Using the information included in the report, the processing devices modify the EPGs to visually display the number of viewers watching the various television programs. The modification can take the form of selected colors, sizes, or shapes of the EPG entries or icons or animation displayed with the EPG.

The invention discloses a method and a device for feeding back channel state information reports. The method includes the following steps that: a base station configures parameters of a plurality of groups of channel state information (CSI) reports; and the base station informs UE about the parameters of the plurality of groups of channel state information (CSI) reports and instructs the UE to feed back the channel state information (CSI) reports of a predetermined group. The parameters of each group of channel state information (CSI) reports in the plurality of groups of channel state information (CSI) reports comprise a resource allocation parameter of one or a plurality of channel state information reference signal (CSI-RS) resources which are used for channel measurement. The parameters of each group of channel state information (CSI) reports in the plurality of groups of channel state information (CSI) reports further comprise one of the following parameters: distribution information of one or a plurality of interference measurement resources corresponding to each channel state information reference signal (CSI-RS) resource in one or the plurality of channel state information reference signal (CSI-RS) resources; a parameter which is used for indicating the corresponding relationship between one or the plurality of channel state information reference signal (CSI-RS) resources and the interference measurement resources; a parameter which is used for indicating the corresponding relationship between the channel state information reference signal (CSI-RS) resources and channel state information reference signal (CSI-RS) resources used for interfering calculation; and/or a parameter used for indicating the corresponding relationship between one or a plurality of channel state information reference signal (CSI-RS) resources and component carriers in carrier aggregation.

The invention provides a method for feeding back channel state information (CSI), comprising the following steps of: receiving a CSI reference signal CSI-RS (CSI-Reference Signal) measurement set configuration signaling from a base station, and the CSI-RS measurement set configuration signaling comprising indications which aim at a CSI-RS measurement set configured by a user device; measuring the CSI-RS in the CSI-RS measurement set according to the indications of the CSI-RS measurement set to obtain metrics corresponding to the format of the CSI-RS in the CSI-RS measurement set; obtaining a CSI-RS report set which is selected from the CSI-RS measurement set according to the metrics; determining a CSI feedback resource corresponding to the format of the CSI-RS in the CSI-RS report set; and using the determined CSI feedback resource to feed back the CSI corresponding to the format of the CSI-RS in the CSI-RS report set to the base station. As well, the invention also provides the corresponding user device and the base station.

A method of transmitting information over a feed back channel of a communication system that has multiple antenna systems is provided. Long term channel condition information is obtained from received measured and/or calculated channel parameter values. The obtained long term channel condition information is arranged in a particular manner and transmitted over a defined time period during which the long term channel condition information varies relatively slowly. Because the long term information remains relatively constant for one or more defined time periods, the amount of bandwidth needed to communicate this value is small because it need only be communicated occasionally. Thus only a small bandwidth needs to be allocated for transmitting this long term information.

High field-effect mobility is provided for a semiconductor device including an oxide semiconductor. Further, a highly reliable semiconductor device including the transistor is provided. In a transistor in which a stack of oxide semiconductor layers is provided over a gate electrode layer with a gate insulating layer provided therebetween, an oxide semiconductor layer functioning as a current path (channel) of the transistor and containing an n-type impurity is sandwiched between oxide semiconductor layers having lower conductivity than the oxide semiconductor layer. In the oxide semiconductor layer functioning as the channel, a region on the gate insulating layer side contains the n-type impurity at a higher concentration than a region on the back channel side. With such a structure, the channel can be separated from the interface between the oxide semiconductor stack and the insulating layer in contact with the oxide semiconductor stack, so that a buried channel can be formed.

A method and an apparatus to reproduce a 7.1 channel encoded sound through a 5.1 channel speaker system are provided. The apparatus includes a decoder to separate a 7.1 channel audio bitstream into 8 channel audio signals, a signal corrector to correct characteristics of a left channel audio signal, a right channel audio signal, a center channel audio signal, left and right surround channel audio signals, and a low frequency effect channel audio signal out of the 8 channel audio signals, a back surround filter to form virtual speakers for a left back channel audio signal and a right back channel audio signal at arbitrary locations using head related transfer functions measured at predetermined locations around a listener and to cancel crosstalk between the virtual speakers, and an adder to add the right surround channel audio signal output by the signal corrector to the right back channel audio signal output by the back surround filter and to add the left surround channel audio signal output by the signal corrector to the left back channel audio signal output by the back surround filter.