Patent application number | Description | Published |
20090325526 | Method and apparatus for reporting state information - A method for reporting state information is provided. The receiver device receives a service, which is encoded in at least two layers over a communication channel, through a subset of said at least two layers; it measures a channel quality parameter; and in response to the channel quality parameter reaching a predetermined threshold value, it receives the service through a modified subset of the at least two layers as a function of the measured channel quality parameter and transmitting state information of the receiver device. Thus, the signal overhead is reduced. | 12-31-2009 |
20100267407 | Method for scheduling wake/sleep cycles by a central device in a wireless network - A method for scheduling wake/sleep cycles by a central device in a wireless network is provided. The wireless network comprises at least one mobile device. The method comprises: attributing a wake/sleep cycle length to each mobile device, wherein the wake/sleep cycle length is an integer multiple of a system schedule cycle; assigning a sleep period and a wake period within the wake/sleep cycle of each mobile device; and arranging the wake/sleep cycle of each mobile device to avoid collision of the wake period with those of other mobile devices. The present invention can keep the maximum sleep cycle period of each MS to guarantee the QoS requirement and to efficiently utilize the system bandwidth. | 10-21-2010 |
20110002265 | METHOD AND DEVICE FOR PROVIDING A SERVICE - A method for providing a service comprising a plurality of coding layers in a communication network is provided, and wherein each one of said plurality of layers is associated with a unique identifier, the method uses a single message containing necessary information for a receiver to derive all identifiers for several layers within a single service; the method allows to reduce the messages exchange in such a communication system. | 01-06-2011 |
20110075599 | METHOD AND APPARATUS FOR MULTICAST GROUP MANAGEMENT - It provides a method for multicast group management. The apparatus determines a request for joining a multicast service derived during establishment of a connection for carrying multicast service between a first device and a second device, and it sends a message indicative of joining said multicast service based on the request for joining if the multicast service is not available in said network device. As a consequence, it reduces the messages exchanged in unreliable wireless connection so as to reduce the probability of service interruption. | 03-31-2011 |
20110264977 | METHOD FOR RECEIVING AND TRANSMITTING DATA BLOCKS - The present invention provides a scalable and reliable feedback suppression method for receiving and transmitting data block. The method comprises receiving at least one initial data packet of the data block which is sent by the transmitter to the multicast group of receivers; and sending at least one NAK packet indicating packet loss to the transmitter by at least one receiver of the multicast group, wherein the at least one NAK packet is sent in a single uplink time slot dedicated to said multicast group of receivers, and wherein the NAK packet is identical for all receivers of said multicast group. | 10-27-2011 |
20120021759 | METHOD AND APPARATUS FOR DETERMINING LOCATION INFORMATION - A method for determining location information used in an electronic device of a communication system including a plurality of electronic devices, comprising: transmitting a position request signal via a plurality of communication networks of the communication system; receiving a position response signal with respective location information from at least one electronic devices of the plurality of electronic devices; and determining position information of the electronic device by the received position response signal; wherein the position request signal is transmitted successively to the plurality of networks in a specific order among said networks until the location information of the electronic device is determined based on the location response signal. | 01-26-2012 |
20120084815 | METHOD FOR PROVIDING MULTICAST SERVICES - It is provided a method for providing a service guide in a network providing a plurality of multicast services, said network comprising at least one client device connected to an intermediate a first device, wherein a subset of said plurality of multicast services is being multicast to said at least one client device via said intermediate first device, and the service guide provides a list of the plurality of multicast services in a second order; and at the side of a client device, the method comprises the steps of determining a list of the plurality of multicast services in a first order, wherein the order is changed from the second order to the first order based on the multicast services of the subset; and presenting said list of multicast services in said first order. | 04-05-2012 |
20120320814 | HANDOVER METHOD OF MULTICAST AND BROADCAST SERVICE IN WIRELESS NETWORK - A method of a mobile station receiving data packets from a serving base station via a multicast or broadcast connection in a wireless network is provided for performing a handover from the serving base station to a target base station. The method comprises, at the level of the mobile station, the steps of: upon the detection of the quantity of buffered data packets in the mobile station being lower than a first threshold value, establishing a unicast connection with the serving base station to receive data packets from the serving base station; and upon detection of the level of buffered data packets reaching the predetermined threshold level, performing a handover from the serving base station to the target base station. According to the invention, a seamless handover of a mobile station in a wireless network providing Multicast and Broadcast Service (MBS service) can be achieved to prevent the MBS service interruption during the handover. | 12-20-2012 |
20130021937 | METHOD AND APPARATUS FOR MONITORING QUALITY OF SERVICE OF NETWORK - When capturing packets at the application level for the purpose of QoS monitoring, a QoS monitor needs to be bound to the same IP address and port as those of a media player. However, due to the unicast duplicate binding problem, a unicast packet captured by the QoS monitor will not be received by the media player, which means the QoS monitor have affected the operation of the media player. The present invention provides a solution to make the QoS monitor, upon the receipt of a unicast packet, forward the packet to the socket of the media player. In order to guarantee that the forwarded packet can be received by the socket of the media player, the QoS monitor needs to keep the port unchanged and replace the destination IP address with the local host address (127.0.0.1). According to the invention, the QoS monitor can sniff the media player without interference to the normal operation of the media player. | 01-24-2013 |
20130044224 | METHOD AND APPARATUS FOR ASSESSING QUALITY OF VIDEO STREAM - Objective video quality assessment models at media-layer or at packet-layer are known for estimating audio/video quality of experience. Existing models are not able to provide stable performance. A method for enabling quality assessment of a stream of frames of video data comprises receiving a sequence of packets, generating a set of parameters and inserting said generated set of parameters as side information into said stream of frames, wherein at least one parameter refers to a video slice level. A method for assessing the quality of a stream of frames of video data comprises receiving a sequence of packets, extracting a set of parameters from said sequence of packets and generating an estimated mean opinion score, wherein the video data comprise a slice level and wherein the extracted set of parameters comprises at least one parameter that refers to a video slice level. | 02-21-2013 |
20130223208 | METHOD AND APPARATUS FOR QUALITY OF EXPERIENCE MANAGEMENT FOR NETWORK SERVICES - The present invention provides a QoE (Quality of Experience) management solution, wherein QoE feedback is used to optimize the usage of QoS provisioning techniques, thus improving the utilization efficiency of network resources. According to one aspect of the invention, a method for QoE management for a network service provided to a user device, the method comprising: displaying a user interface on the user device for a user to input an expected QoE value of the network service; receiving the expected QoE value of the network service from the user; evaluating an objective QoE value of the network service as a function of network QoS parameters; and adjusting the QoS parameters of the network service if the objective QoE value is less than the expected QoE value. | 08-29-2013 |
20130262554 | METHOD AND APPARATUS FOR MANAGING CONTENT DISTRIBUTION OVER MULTIPLE TERMINAL DEVICES IN COLLABORATIVE MEDIA SYSTEM - A method and an apparatus for managing content distribution over multiple terminal devices in collaborative media system are provided. In the collaborative media system, a first media data is transmitted over a first channel path to a first media terminal and a second media data relevant to the first media data is transmitted over a second channel to a second media terminal. The method comprises: detecting a quality of the first media data on the first channel path and that of the second media data on the second channel path; upon detection the quality of the first media data being lower than a first predetermined value and that of the second media data being greater than a second predetermined value, transmitting the second media data over the second channel path, instead of the first media data over the first channel path, to the first media terminal (S | 10-03-2013 |
20140119460 | METHOD AND DEVICE FOR ASSESSING PACKET DEFECT CAUSED DEGRADATION IN PACKET CODED VIDEO - Because of the encoding, decoding, and/or transmitting characteristic, the blocks affected by packet defect usually gather in a small spatial/temporal area. The viewers perception of each affected block will influence by other affected block in this small area. The invention proposes using processing means for clustering blocks affected by the packet loss into at least one cluster, for using at least one of spatial and temporal characteristics of the at least one cluster for determining a visibility value of the at least one cluster, for classifying the at least one cluster as belonging into one of at least two different class candidates, wherein each class candidate is associated with a different weight; for weighting the determined visibility value with the weight associated with the class of the at least one cluster, and for assessing the degradation of the video using a sum of the weighted visibility value. | 05-01-2014 |
20140219350 | METHOD AND DEVICE FOR ESTIMATING VIDEO QUALITY ON BITSTREAM LEVEL - A method for estimating video quality on bit-stream level, wherein the video quality refers to a video after error concealment and the method is performed on bit-stream level before said error concealment, comprises extracting and/or calculating a plurality of global condition features from a video bit-stream, extracting and/or calculating a plurality of local effectiveness features at least for a lost MB, calculating a numeric error concealment effectiveness level for each (or at least for each lost) MB by emulating an error concealment method that is used in said error concealment, and providing the calculated error concealment effectiveness level as an estimated visible artifacts level of video quality. | 08-07-2014 |
20140286441 | VIDEO QUALITY MEASUREMENT - A particular implementation receives a bitstream and derives parameters from the bitstream. The parameters include quantization parameters, content unpredictability parameters, ratios of lost blocks, ratios of propagated blocks, error concealment distances, motion vectors, durations of freezing, and frame rates. Using these parameters, a compression distortion factor, a slicing distortion factor, and a freezing distortion factor are estimated respectively for distortions resulting from video compression, a slicing mode error concealment, and a freezing slicing mode error concealment. The distortion factors are then mapped to a composite video quality score. For applications with limited computational power, the estimation of distortion factors can be simplified. In particular, the compression distortion factor, the slicing distortion factor, and the freezing distortion factor can be predicted from quantization parameters, ratios of lost blocks, and durations of freezing, respectively. | 09-25-2014 |
20140301486 | VIDEO QUALITY ASSESSMENT CONSIDERING SCENE CUT ARTIFACTS - A particular implementation detects scene cut artifacts in a bitstream without reconstructing the video. A scene cut artifact is usually observed in the decoded video (1) when a scene cut picture in the original video is partially received or (2) when a picture refers to a lost scene cut picture in the original video. To detect scene cut artifacts, candidate scene cut pictures are first selected and scene cut artifact detection is then performed on the candidate pictures. When a block is determined to have a scene cut artifact, a lowest quality level is assigned to the block. | 10-09-2014 |
20140334555 | METHOD AND APPARATUS FOR VIDEO QUALITY MEASUREMENT - Accuracy and efficiency of video quality measurement are major problems to be solved. According to the invention, a method for accurately predicting video quality uses a rational function of the quantization parameter QP, which is corrected by a correction function that depends on content unpredictability CU. Exemplarily, the correction function is a power function of the CU. Both QP and CU can be computed from the video elementary stream, without full decoding the video. This ensures high efficiency. | 11-13-2014 |