Patent application number | Description | Published |
20100135167 | METHOD AND APPARATUS FOR MEDIA ACCESS IN CONTENTION-BASED NETWORKS - A method and apparatus are described for gaining access to a communication medium in a contention-based network, including determining a slot count based on a number of stations in the contention-based network, adjusting the slot count, initiating a frame transmission when the slot count reaches a predetermined value and wherein said number of stations and an address queue are adjusted to reflect a priority. Further, a method and apparatus are described for gaining access to a communication medium in a contention-based network, including receiving a slot count based on a number of stations in the contention-based network, adjusting the slot count, initiating a frame transmission when the slot count reaches a predetermined value and wherein said number of stations and an address queue are adjusted to reflect a priority. | 06-03-2010 |
20100135319 | METHOD AND APPARATUS FOR MEDIA ACCESS IN CONTENTION-BASED NETWORKS - A method and apparatus are described for gaining access to a communication medium in a contention-based network, including determining a slot count based on a number of stations in the contention-based network, adjusting the slot count, initiating a frame transmission when the slot count reaches a predetermined value and wherein said number of stations and an address queue are adjusted to reflect one of a priority and traffic patterns. Further, a method and apparatus are described for gaining access to a communication medium in a contention-based network, including receiving a slot count based on a number of stations in the contention-based network, adjusting the slot count, initiating a frame transmission when the slot count reaches a predetermined value and wherein said number of stations and an address queue are adjusted to reflect a priority. | 06-03-2010 |
20100189021 | METHOD AND APPARATUS FOR POWER MANAGEMENT IN WLAN - A method and apparatus for improving power performance of a wireless adapter which adopts a time slicing scheme by dividing a beacon interval into multiple slices, and assigning these slices to the stations through the beacon frame. The stations wakeup at the appointed slices to receive their buffered frames from an access point, and may enter into sleep state once the transactions conclude. A further embodiment including formatting data into a control frame for use in a wireless local area network, the frame including an indication, for each station associated with the wireless local area network, whether frames are buffered awaiting transmission to each respective station, a number of time intervals between control frames, and at which time interval the transmission of the buffered frames will begin for each station having buffered frames awaiting transmission. | 07-29-2010 |
20100265864 | Method and apparatus for power management in communication system - A method and apparatus for power management in the communication system, wherein the method for transmitting data from an access point to communication units comprising: assigning, by the access point, a first and a second association identifier in a message, to each of the communication units, to indicate the presence of respective buffered multicast data and unicast data respectively; setting, by the access point, the first association identifier to indicate the corresponding communication unit to receive the buffered multicast data, the second association identifier to indicate the corresponding communication unit to receive the buffered unicast data; and transmitting, by the access point, the message to awake the communication unit corresponding to the set first and/or second association identifier so as to transmit the buffered data thereto. | 10-21-2010 |
20110007656 | DETERMINISTIC BACK-OFF METHOD AND APPARATUS FOR PEER-TO-PEER COMMUNICATIONS - A method and apparatus are described including identifying a channel that a decentralized network is using for communications and identifying a station that is a member of the decentralized network to monitor data transmission activity over the identified channel. Also described are a method and apparatus for a station to transmit data over a communication medium of a decentralized network including monitoring the communication medium, determining if the communication medium is idle, transmitting data if the communication medium is idle and if the station has a data to transmit and adjusting a slot count and a service ring configuration if the medium is busy. Further described are a method and apparatus including monitoring a communication channel used by a decentralized network, determining a number of available idle time slots between two successive frame transmissions initiated by different stations, updating a service ring, adjusting a number of stations and adjusting a slot count. | 01-13-2011 |
20110007703 | RELAXED DETERMINISTIC BACK-OFF METHOD FOR MEDIUM ACCESS CONTROL - A method and apparatus are described including transmitting data if a slot count is equal to a triggering event, selecting a new triggering event responsive to a failed data transmission and replacing the triggering event with the new triggering event. | 01-13-2011 |
20120063307 | ADAPTIVE TRIGGERING SET FOR RELAXED DETERMINISTIC BACK-OFF METHOD - A method and system are described including retrieving a sparseness indication, retrieving an indication of a number of failed transmissions, comparing the sparseness indication to an optimal sparseness, comparing the number of failed transmissions to a first threshold, adjusting a size of a set of triggering events responsive to both the first and the second comparison, comparing a data buffer push rate to a data buffer arrival rate, further adjusting the size of the triggering set responsive to the third comparison, determining system fairness, comparing the size of the triggering set to a second threshold and further adjusting the size of the triggering set responsive to one of the determination and a combination of the determination and the fourth comparison. | 03-15-2012 |
20120127969 | SEMI-RANDOM BACK-OFF METHOD FOR ACHIEVING RESOURCE RESERVATION IN WIRELESS LOCAL AREA NETWORKS - A method and apparatus are described including determining if a successful unicast transmission has occurred, adjusting a contention window to a minimum value and adjusting a time slot back-off counter to one-half of the value of the contention window plus one responsive to the determination and adjusting the contention window using one of a plurality of adjustment schemes and selecting said time slot back-off counter from an interval between zero and the contention window. | 05-24-2012 |
20130121257 | Mapping Signals from a Virtual Frequency Band to Physical Frequency Bands - Embodiments include processes, systems, and devices for reshaping virtual baseband signals for transmission on non-contiguous and variable portions of a physical baseband, such as a white space frequency band. In the transmission path, a spectrum virtualization layer maps a plurality of frequency components derived from a transmission symbol produced by a physical layer protocol to sub-carriers of the allocated physical frequency band. The spectrum virtualization layer then outputs a time-domain signal derived from the mapped frequency components. In the receive path, a time-domain signal received on the physical baseband is reshaped by the virtual spectrum layer in order to recompose a time-domain symbol in the virtual baseband. | 05-16-2013 |
20130122949 | Mapping a Transmission Stream in a Virtual Baseband to a Physical Baseband with Equalization - Embodiments include processes, systems, and devices for reshaping virtual baseband signals for transmission on non-contiguous and variable portions of a physical baseband, such as a white space frequency band. In the transmission path, a spectrum virtualization layer maps a plurality of transmission components associated with a transmission symbol produced by a physical layer protocol to sub-carriers of the allocated physical frequency band. The spectrum virtualization layer then outputs a physical transmission symbol composed of time-domain samples derived from the mapped frequency components and a cyclic prefix. In the receive path, a time-domain symbol received on the physical baseband is reshaped and equalized by the virtual spectrum layer in order to recompose a time-domain samples of a transmission stream in the virtual baseband. | 05-16-2013 |
20130148501 | CONSTANT WINDOW BACK-OFF METHOD FOR MULTIPLE ACCESS IN WIRELESS LOCAL AREA NETWORKS - A method and apparatus are described including determining a target congestion index, determining a congestion index based on information from a last back-off round, comparing the target congestion index with the congestion index, performing one of increasing a triggering set size by a first factor and decreasing the triggering set size by a second factor responsive to the comparison, determining if a communications medium is idle, adjusting a back-off counter responsive to the third determining act, determining if the back-off counter is equal to a triggering point in the triggering set and transmitting data responsive to the fourth determining act. | 06-13-2013 |
20140051467 | Spectrum Allocation for Base Station - Embodiments include processes, systems, and devices that allow a white space base station to request available frequency ranges for white space transmission in a local area. A white space finder service models a primary user device's transmission signal propagation area using terrain data associated with the local area of the primary user device. The white space finder service also determines, based on the location of the white space base station and the modeled propagation area, one or more locally available, non-interfering frequency ranges and provides them to the white space base station. The white space base station compares the provided frequency ranges to policies and selects one or more of the available frequencies that accommodate the policies. The white space base station also maps the transmission frequency ranges to virtual frequency ranges for transmission by a software-defined radio employing spectrum virtualization. | 02-20-2014 |
20150117386 | Spectrum Allocation for Base Station - Embodiments include processes, systems, and devices that allow a white space base station to request available frequency ranges for white space transmission in a local area. A white space finder service models a primary user device's transmission signal propagation area using terrain data associated with the local area of the primary user device. The white space finder service also determines, based on the location of the white space base station and the modeled propagation area, one or more locally available, non-interfering frequency ranges and provides them to the white space base station. The white space base station compares the provided frequency ranges to policies and selects one or more of the available frequencies that accommodate the policies. The white space base station also maps the transmission frequency ranges to virtual frequency ranges for transmission by a software-defined radio employing spectrum virtualization. | 04-30-2015 |
Patent application number | Description | Published |
20090074080 | Estimating Complexity of Video Frames for Encoding - Complexity for a video frame after a special event is estimated and used for encoding the frame. The complexity for a key frame of a special event is estimated based on its intra activity and a complexity of a previously encoded key frame in the video stream prior to the special event. The complexity for a dependent frame after a special event is estimated based on a motion estimation cost for the dependent frame and a complexity of a previously encoded dependent frame prior to the special event. | 03-19-2009 |
20100128800 | Method and Apparatus for Closed Caption Transcoding - Caption data incorporated in an input coded bit stream conveying a video service is processed by recovering the caption data from the input coded bit stream, decoding the input coded bit stream to form a digital video signal composed of a sequence of frames, embedding the caption data in an ancillary data space of the digital video signal, and encoding the digital video signal to produce an output coded bit stream incorporating the caption data. | 05-27-2010 |
20100165194 | CAPTURE BUFFER CONTROL METHODOLOGY FOR CAPTION CARRIAGE SWITCH - A system, method, and computer readable medium for avoiding underflow of a caption buffer in a digital video encoding device. The method receives a sequence of digital video frames, and captions that correspond to the digital video frames in the sequence. The method receives first captions in a first caption carriage, and encodes the first captions, and the corresponding digital video frames, in a compressed video format. The method detects a switch from the first caption carriage to a second caption carriage, and stores second captions in the capture buffer, where each second caption is received in the second caption carriage and corresponds to one of the digital video frames in the sequence. The method examines the capture buffer and the second captions to determine whether underflow of the capture buffer is present or absent. When underflow is absent, the method encodes the second captions, and the corresponding digital video frames, in the compressed video format. | 07-01-2010 |
20130188697 | METHOD AND APPARATUS FOR SIGNALING AND CONSTRUCTION OF VIDEO CODING REFERENCE PICTURE LISTS - Improved method and apparatus for signaling of reference pictures used for temporal prediction. The signaling schemes and construction process for different reference picture lists in HEVC Working Draft 5 (WD5) are improved. | 07-25-2013 |
20130208792 | REFERENCE PICTURE SET (RPS) SIGNALING FOR SCALABLE HIGH EFFICIENCY VIDEO CODING (HEVC) - Embodiments contemplate coding video data by generating a video encoded bitstream that may include reference picture set (RPS) extensions for inter-layer reference pictures, and the extensions may include inter-layer delta Picture Order Counts (POCs). Embodiments may also include signaling that lower layer reference pictures may be available in a lower layer decoder picture buffer (DPB), and/or an aggregate DPB, that may be added to the RPS set of a higher layer. The bitstream may include a signal indicating whether the higher layer RPS may be specified by a lower layer RPS, and the lower layer RPS may be temporal, inter-layer prediction (ILP), or both. | 08-15-2013 |
20140010282 | POWER AWARE VIDEO DECODING AND STREAMING - Methods and systems are disclosed for a mobile device to decode video based on available power and/or energy. For example, the mobile device may receive a media description file (MDF) from for a video stream from a video server. The MDF may include complexity information associated with a plurality of video segments. The complexity information may be related to the amount of processing power to be utilized for decoding the segment at the mobile device. The mobile device may determine at least one power metric for the mobile device. The mobile device may determine a first complexity level to be requested for a first video segment based on the complexity information from the MDF and the power metric. The mobile device may dynamically alter the decoding process to save energy based on the detected power/energy level. | 01-09-2014 |
20140010294 | CODEC ARCHITECTURE FOR MULTIPLE LAYER VIDEO CODING - Systems, methods, and instrumentalities are provided to implement video coding system (VCS). The VCS may be configured to receive a video signal, which may include one or more layers (e.g., a base layer (BL) and/or one or more enhancement layers (ELs)). The VCS may be configured to process a BL picture into an inter-layer reference (ILR) picture, e.g., using picture level inter-layer prediction process. The VCS may be configured to select one or both of the processed ILR picture or an enhancement layer (EL) reference picture. The selected reference picture(s) may comprise one of the EL reference picture, or the ILR picture. The VCS may be configured to predict a current EL picture using one or more of the selected ILR picture or the EL reference picture. The VCS may be configured to store the processed ILR picture in an EL decoded picture buffer (DPB). | 01-09-2014 |
20140036999 | FRAME PRIORITIZATION BASED ON PREDICTION INFORMATION - Priority information may be used to distinguish between different types of video data, such as different video packets or video frames. The different types of video data may be included in the same temporal level and/or different temporal levels in a hierarchical structure. A different priority level may be determined for different types of video data at the encoder and may be indicated to other processing modules at the encoder, or to the decoder, or other network entities such as a router or a gateway. The priority level may be indicated in a header of a video packet or signaling protocol. The priority level may be determined explicitly or implicitly. The priority level may be indicated relative to another priority or using a priority identifier that indicates the priority level. | 02-06-2014 |
20140050264 | Slice base skip mode signaling for multiple layer video coding - Methods and apparatus may be used to signal slice skip mode of a multiple layer scalable coding system. A correlation between the corresponding regions of video signals in multiple layers and inter-layer processing techniques may make it possible to infer a slice or picture in the enhancement layer from the corresponding region in a base layer picture. Accordingly, a video stream may be encoded to indicate that an enhancement layer slice or picture may be skipped. | 02-20-2014 |
20140064374 | METHOD AND APPARATUS OF MOTION VECTOR PREDICTION FOR SCALABLE VIDEO CODING - Inter-layer motion mapping information may be used to enable temporal motion vector prediction (TMVP) of an enhancement layer of a bitstream. For example, a reference picture and a motion vector (MV) of an inter-layer video block may be determined. The reference picture may be determined based on a collocated base layer video block. For example, the reference picture may be a collocated inter-layer reference picture of the reference picture of the collocated base layer video block. The MV may be determined based on a MV of the collocated base layer video block. For example, the MV may be determined by determining the MV of the collocated base layer video block and scaling the MV of the collocated base layer video block according to a spatial ratio between the base layer and the enhancement layer. TMVP may be performed on the enhancement layer picture using the MV of the inter-layer video block. | 03-06-2014 |
20140072031 | Reference Picture Lists Modification - Systems, methods, and instrumentalities are disclosed relating to modifications to reference picture lists used for multiple layer video coding. A bitstream that may include a reference picture list of a slice may be received. An indication to reposition a reference picture within the reference picture list from a first position to a second position may be received. An indication to insert a reference picture within the reference picture list at a position may be received. The reference picture may be repositioned and/or inserted in the reference picture list in response to receiving the indication. A reference picture previously associated with the position may be shifted in the reference picture list according to the indication to reposition and/or insert the reference picture, although an indication to reposition the reference picture previously associated with the position may not be received. The slice may be decoded using the reference picture list. | 03-13-2014 |
20140079126 | Method and Apparatus for Region of Interest Video Coding Using Tiles and Tile Groups - Systems, methods, and instrumentalities are disclosed relating to region of interest (ROI) video coding using tiles and tile groups. An encoded video sequence including a plurality of tiles may be received. The plurality of tiles may be divided into one or more tile groups. Signaling indicating parameters of the one or more tile groups may be received. A tile group of the one or more tiles groups may be decoded and a picture relating to the decoded tile group may be displayed. The decoded tile group may overlap the ROI. The ROI may correspond to the displayed picture and the displayed picture may be a portion of the encoded video sequence. The tile groups that do not overlap the ROI may not be decoded. | 03-20-2014 |
20150103886 | HIGH LEVEL SYNTAX FOR HEVC EXTENSIONS - A video coding device may identify a network abstraction layer (NAL) unit. The video coding device may determine whether the NAL unit includes an active parameter set for a current layer. When the NAL unit includes the active parameter set for the current layer, the video coding device may set an NAL unit header layer identifier associated with the NAL unit to at least one of: zero, a value indicative of the current layer, or a value indicative of a reference layer of the current layer. The NAL unit may be a picture parameter set (PPS) NAL unit. The NAL unit may be a sequence parameter set (SPS) NAL unit. | 04-16-2015 |
20150103898 | WEIGHTED PREDICTION PARAMETER SIGNALING FOR VIDEO CODING - Systems, methods, and instrumentalities are provided to implement weighted prediction (WP) signaling, A decoding device may receive a plurality of first list WP parameters, and a. weights present flag. The weights present flag may indicate whether a plurality of second list WP parameters are signaled. The decoding device may receive the second list WP parameters when the weights present flag indicates that the second list WP parameters are signaled. The plurality of second list WP parameters may be derived when the weights present flag indicates that the second list WP parameters are not signaled. The decoding device may receive a delta parameter present, flag, which may indicate whether a plurality of delta WP parameters are signaled. The decoding device may receive the delta WP parameters, when the delta parameter present flag indicates that the plurality of the delta WP parameters are signaled. | 04-16-2015 |
20150110172 | PARALLEL DECODING METHOD FOR LAYERED VIDEO CODING - Systems, methods, and instrumentalities are disclosed for parallel decoding of a layered video stream. A base layer video stream and an enhancement layer video stream may be received. A picture of the base layer video stream may be decoded via a first processing thread. An inter-layer reference picture associated with the base layer video stream may be generated via the first processing thread. The inter-layer reference picture may include one or more motion fields. A picture of the enhancement layer video stream may be decoded via a second thread using the inter-layer reference picture. The first processing thread and the second processing thread may be synchronized such that the decoding of the picture of the enhancement layer video stream is performed after the generation of the inter-layer reference picture. | 04-23-2015 |
20150189298 | METHODS, APPARATUS AND SYSTEMS FOR SCALABLE VIDEO CODING WITH MIXED INTERLACE AND PROGRESSIVE CONTENT - Methods, apparatus, and systems for video coding/decoding are disclosed. One representative method includes a decoder receiving video content including at least a base layer (BL), an enhancement layer (EL) and phase information. The phase information includes an indicator indicating one or more sets of phase parameters from among plural sets of phase parameters. The method further includes assembling the BL into an inter-layer reference (ILR) picture based on the video content and the received phase information, selecting one or both of the ILR picture or an EL reference picture, and predicting a current EL picture using the phase information and one or more of the selected ILR picture or the selected EL reference picture. | 07-02-2015 |
20150189322 | Sub-bitstream Extraction Process for HEVC Extensions - Systems and methods are described for simplifying the sub-bitstream extraction and the rewriting process. In an exemplary method, a video is encoded as a multi-layer scalable bitstream including at least a base layer and a first non-base layer. The bitstream is subject to the constraint that the image slice segments in the first non-base layer each refer to a picture parameter set in the base layer. Additional constraints and extra high level syntax elements are also described. Embodiments are directed to (i) constraints on the output layer set for sub-bitstream extraction process; (ii) VPS generation for the sub-bitstream extraction process; and (iii) SPS/PPS generation for the sub-bitstream extraction process. | 07-02-2015 |
20150264377 | Reference Picture Set Mapping for Standard Scalable Video Coding - Systems, methods, and instrumentalities are disclosed for reference picture set mapping for scalable video coding. A device may receive an encoded scalable video stream comprising a base layer video stream and an enhancement layer video stream. The base layer video stream and the enhancement layer video streams may be encoded according to different video codecs. For example, the base layer video stream may be encoded according to H.264/AVC and the enhancement layer may be encoded according to HEVC. The enhancement layer video stream may include inter-layer prediction information. The inter-layer prediction information may include information relating to the base layer coding structure. The inter-layer prediction information may identify one or more reference pictures available in a base layer decoded picture buffer (DPB). A decoder may use the inter-layer prediction information to decode the enhancement layer video stream. | 09-17-2015 |
20150358635 | MOTION INFORMATION SIGNALING FOR SCALABLE VIDEO CODING - Systems, methods and instrumentalities are provided to implement motion information signaling for scalable video coding. A video coding device may generate a video bitstream comprising a plurality of base layer pictures and a plurality of corresponding enhancement layer pictures. The video coding device may identify a prediction unit (PU) of one of the enhancement layer pictures. The video coding device may determine whether the PU uses an inter-layer reference picture of the enhancement layer picture as a reference picture. The video coding device may set motion vector information associated with the inter-layer reference picture of enhancement layer to a value indicative of zero motion, e.g., if the PU uses the inter-layer reference layer picture as the reference picture. | 12-10-2015 |
Patent application number | Description | Published |
20130107808 | Base Station and Method for Clock Synchronization of Base Station | 05-02-2013 |
20130288752 | COMMUNICATION SYSTEM, APPARATUS AND METHOD - A communication system, apparatus and method are provided according to embodiments of the present invention. The communication system includes: a base band unit (BBU), at least two antennas and at least two radio-frequency (RF) units, where the at least two RF units are connected with the BBU respectively; and each of the antennas is connected with at least two RF units respectively, so that a signal received from a same sector by an antenna is sent to the BBU via different RF units. With the embodiments of the present invention, the reliability of RF units may be improved without increasing the hardware cost of the base station. | 10-31-2013 |
20130308626 | METHOD AND APPARATUS OF IMPLEMENTING TIME SYNCHRONIZATION - The present invention discloses a method of time synchronization and a base station system. The base station system includes a main unit, at least one radio unit, and a transmission medium adapted to transmit information between the main unit and the at least one radio unit. The base station system further includes a clock synchronization server configured close to the side of the at least one radio unit or integrated with the at least one radio unit. The clock synchronization server is adapted to transmit synchronization data to the main unit through the transmission medium, so that the main unit performs configuration processing according to the synchronization data to implement time synchronization with the clock synchronization server. | 11-21-2013 |
20140100350 | SOLID-PHASE POLYMERIZATION METHOD FOR PREPARING HIGH-MOLECULAR-WEIGHT ALIPHATIC POLYESTER - A solid-phase polymerization method of high-molecular-weight aliphatic polyester conducts the solid-phase polymerization of aliphatic polyester prepolymer under a gas stream containing sulfonic acid catalyst. The method features preparing metal free aliphatic polyester with high molecular weight, good color and luster and perfect thermal stability efficiently. The non-metal-ion aliphatic polyester is not only applicable to common use, but is also suitable as high value-added medical material and packing material which contacts with food directly than other metal-containing polyester. | 04-10-2014 |
20150362943 | ADAPTIVE VOLTAGE SCALING CIRCUIT AND CHIP - The present invention discloses an adaptive voltage scaling circuit and a chip. The adaptive voltage scaling circuit includes a performance classification monitor and an adaptive controller, where the performance classification monitor is disposed inside the chip, and is configured to detect working performance of the chip at a current working voltage, and output a detection result signal to the adaptive controller; and the adaptive controller is connected to the performance classification monitor, and is configured to output a control signal to a power management module of the chip according to the detection result signal output by the performance classification monitor, where the control signal is used to control the power management module to adjust a working voltage of the chip. In embodiments of the present invention, test workload can be reduced. | 12-17-2015 |