45results about How to "Lower end-to-end latency" patented technology

Decoder retrieval timing information, ROI information and tile identification information are conveyed within a video data stream at a level which allows for an easy access by network entities such as MANEs or decoder. In order to reach such a level, information of such types are conveyed within a video data stream by way of packets interspersed into packets of access units of a video data stream. In accordance with an embodiment, the interspersed packets are of a removable packet type, i.e. the removal of these interspersed packets maintains the decoder's ability to completely recover the video content conveyed via the video data stream.

Disclosed is a method for a hybrid service discovery adapting between push-based and pull-based schemes in a mobile ad-hoc network and a system thereof. The method includes periodically transmitting a first control packet for providing service information from a service provider that is capable of providing a service to nodes located in a specified advertisement zone, transmitting a second control packet requesting the service from a service demander to one or more nodes in a network, and transmitting a third control packet including path information of the service provider if at least one of the nodes located within the advertisement zone and the service provider receives the second control packet. The method and the system can reduce the amount of control packet transmission and minimize an end-to-end delay.

This invention relates to a method for scheduling and synchronizing all transmissions of data in an ad hoc network. Data is transmitted on a given path from a given source of the data to a given destination. Time is divided into cycles and in each cycle each node in the path transmits data belonging to the path during the same time slot reserved for that node and path. Time slots have arbitrary sizes, are reserved via trial and error, and the time slot schedule is iteratively optimized to reduce end-to-end delay using local coordination rules between nodes. The scheduling method can be used for wireless, wired, acoustic or optical networks.

A system and method for transmitting voice data traffic over a wireless medium, such as a voice call using a wireless Internet Protocol mobile phone on a wireless local area network, to increase the quality and the number of voice calls on a Basic Service Set. Endpoints are capable of dynamically switching to alternate voice coding profiles. The WLAN is surveyed by a wireless endpoint to determine whether a congested network condition exists. Coding profiles may be dynamically switched to decrease the congested conditions and improve call quality. If dynamically switching of profiles in not available then the wireless endpoint gracefully degrades the transmission by periodically dropping packets until network congestion reduces and / or call quality increases.

Devices, softwares and methods are provided for redundantly encoding a data stream into frames for network transmission as packets. A main encoder encodes a data stream into main frames, while a redundant encoder encodes it into redundant frames. The redundant frames have a redundant-coding delay from the main frames that is adjustable to accommodate many different sets of network conditions.

A method, a chipset, a receiver, a transmitter, an electronic device and a system for enabling a control of jitter management of an audio signal is described, wherein the audio signal is distributed to a sequence of frames that are received via a packet switched network, the received frames comprising active audio frames and non-active audio frames, wherein a concatenation of subsequent active audio frames represents an active audio burst, wherein a discrete information of audio activity of the audio signal via the packet switched network is received, the end of an active audio burst is determined based on the received discrete information of audio activity, and wherein jitter compensation of the received frames is controlled on the basis of the determined end of an active audio burst. The invention further relates to a corresponding software program product storing a software code for controlling jitter management of an audio signal.

A method for a hybrid service discovery adapting between push-based and pull-based schemes in a mobile ad-hoc network and a system thereof. The method includes periodically transmitting a first control packet for providing service information from a service provider that is capable of providing a service to nodes located in a specified advertisement zone, transmitting a second control packet requesting the service from a service demander to one or more nodes in a network, and transmitting a third control packet including path information of the service provider if at least one of the nodes located within the advertisement zone and the service provider receives the second control packet. The method and the system can reduce the amount of control packet transmission and minimize an end-to-end delay.

A wireless communication system including a gateway device that connects a core network and a wireless access network. The wireless access network includes a virtual base station that includes a representative base station connected to the gateway device and a plurality of unrepresentative base stations, which are subordinate to the representative base station. The presence of the unrepresentative base stations is hidden from the gateway device and an adjacent base station.

The invention provides a route selection method of minimum hop count based on interference sensing in a wireless D2D network. The method comprises the steps that (1) the emitting power of a D2D node is limited; (2) the highest transmission speed of each hop is computed, and a route optimization model of minimization route hop count is established; and (3) according to an MR-DA algorithm, a route from a source node to a target node is established hop by hop. Under the premise that cellular user communication quality and D2D transmission speed are guaranteed, the route with low hop count is established. By inspecting the highest transmission speed of a candidate node and the target node and the position relation of the candidate node, a current node and the target node, geographical location information and interference control are considered comprehensively, so that the generated router is close to the target node and far away from the base station at the same time, interference on cellular communication is lowered, and the transmission capacity of each hop is increased. Theoretical analysis and simulation results show that the method has the advantages that complexity is low, average hop count is low, and disconnecting probability is low.

A method of encoding and decoding a scalable video data stream comprising a base layer and at least one enhancement layer. encoding a scalable data stream, wherein the data stream comprises at least one non-essential picture at a temporal position of a layer, wherein the non-essential picture is not required for decoding a picture in an upper layer at said temporal position and following said temporal position in decoding order pictures; and signaling information of at least one non-essential picture in the scalable video data stream. In the decoding stage, the signaled information is decoded, and the time position and the layers above the non-essential picture are detected at the time position and following the time position in decoding order without decoding the non-essential picture. Picture decoding.

An augmented reality device computationally processes an image frame against a first augmented reality profile stored in a local database. The first augmented reality profile includes first annotation content associated with a first object and is obtained from a second user device. In response to an object computationally processed from the first image frame satisfying a predetermined threshold of similarity with the first object in the first augmented reality profile, the first annotation content is rendered, on a display of the first user device, relative to the first object according to rendering instructions for the first annotation content.

The invention provides an enhanced neighbor information-based multi-hop broadcast protocol (ENIMBP) in a highway scene. A optimal transmitting vehicle is selected by combining neighbor information of vehicles with positions, steering speeds and directions of the vehicles to determine transmitting waiting time. According to the positions of the vehicles, the ENIMBP can initially determine the transmitting waiting time of the vehicles different in distance from a broadcast vehicle. Under the condition of same distance between the vehicles and the broadcast vehicle, the ENIMBP differentiates the transmitting waiting time by means of speeds and directions of the vehicles. The ENIMBP solves the network partitioning problem and node hiding / exposing problem in the highway scene. Simulation results show that the end-to-end delay can be remarkably reduced in a sparse network, and meanwhile, a very high packet arrival rate is maintained. As the speeds and directions of the vehicles are introduced, the transmitting waiting time of the vehicles with same distance can be differentiated, and under the scene of great vehicle density, the high packet arrival rate can be further maintained.

The invention discloses an audio and video live broadcast implementation method and a server. The audio and video live broadcast implementation method comprises the steps of: modifying cached GOP data closest to a current moment according to a fast-forward playing principle when a new client accesses; and sending the modified GOP data to a client for playing. By applying the audio and video live broadcast implementation method and the server disclosed by the invention, the quality of live broadcast can be improved, and the like.

Embodiments of the invention generally relate to a data frame buffer method and equipment. Specifically, the method can comprise receiving data frames and caching the data frames to a buffer according to a timestamp order corresponding to the data frames, a clock is adjusted according to relative arriving time of the data frames to change the number of data frames capable of being buffered in the buffer, and the data frames are output when play time of the data frames are reached. Correspondingly, the invention further provides data frame buffer equipment. Through the embodiments of the invention, the packet loss rate generated by the jitter buffer can be reduced, and end-to-end delay is reduced so that network changes can be responded sensitively.

A method for decreasing end-to-end delay in a video conferencing context is disclosed. At video conferencing system startup, a processor is initialized to receive either a top field or a bottom field of video frame data. If the first line of a new field arriving after initialization does not match a field state that the processor is initialized to, the present invention senses the state mismatch and adjusts a display buffer by one display line, and the field is stored in the display buffer. The display buffer is adjusted in order to preserve a vertical spatial relationship between the top and bottom fields.

The invention provides a data processing method for a database, and the method comprises the steps: carrying out the analysis of received streaming increment real-time data transmitted by an upstreamsystem, so as to obtain first to-be-processed data which comprises a specified primary key field; obtaining first processed data from a memory database, the first processed data including a specifiedprimary key field; comparing the first to-be-processed data with the first processed data to determine whether first effective to-be-processed data exists or not; under the condition that it is determined that the first effective to-be-processed data exists, determining a first transaction operation based on the first effective to-be-processed data; and executing the first transaction operation toobtain a first updated memory database. The invention further provides a data processing system for the database, electronic equipment and a medium.

The invention relates to the technical field of underwater acoustic cooperative communication systems, in particular to a UDIF cooperative strategy and JMC-suitable for a multi-user system and capableof saving end-to-end delay and used for underwater acoustic cooperative communication. The TED detector can still extract signals of the source node and the relay node according to different interleaving sequences even if interference exists between data packets, and meanwhile, the scheme can also reduce the end-to-end delay time; JMC-disclosed by the invention The TED detector combines the multiple branches to realize multi-branch combination; Turbo equalization and multi-user detection are carried out; The source node and the relay node use different interleaving sequences; therefore, the received signals cannot be directly combined; the signals are combined after de-interleaving processing; The combination coefficient is obtained on the basis of an output steady-state mean square error(SMSE) of each branch detector and is updated during each time of Turbo iterative processing, the method and the device can adaptively combine a plurality of received signals passing through different paths without knowing the CSI between the nodes, and are more suitable for an actual underwater acoustic cooperative communication system.

A method and apparatus for use in suppressing acoustic echo in a target speech signal being transmitted through a packet-based communications network uses frame energy estimation applied to the target speech signal and to a reference speech signal. The method or apparatus estimates one or more reference speech energy levels in one or more reference packets based on one or more of the speech parameters generated by the speech encoding of the reference signal; estimates a target speech energy level in a target packet based on one or more of the speech parameters generated by the speech encoding of the target signal; compares the target speech energy level to one or more reference speech energy levels; and detects an echo in the target speech signal based on the comparison of the target speech energy level to the one or more reference speech energy levels.

A method of searching encrypted files includes a client computing device selecting a specific keyword to search a plurality of encrypted files stored at a server computing device and if the specific keyword has not been previously used to search the plurality of encrypted files, the method further includes using an encrypted keyword index stored at the server computing device to identify one or more encrypted files of the plurality of encrypted files that contain the specific keyword based upon keyword-file relationships stored in the encrypted keyword index. The method also includes, storing the keyword-file relationship for each of the one or more encrypted files that are identified as containing the specific keyword in an encrypted dictionary at the server and during a subsequent search, if the specific keyword has previously been used to search the plurality of encrypted files, the method includes using the encrypted dictionary and the encrypted keyword index stored at the server to identify one or more encrypted files of the plurality of encrypted files that contain the specific keyword based upon the keyword-file relationships for the specific keyword previously stored in the encrypted dictionary.

A method for decreasing end-to-end delay in a video conferencing context is disclosed. At video conferencing system startup, a processor is initialized to receive either a top field or a bottom field of video frame data. If the first line of a new field arriving after initialization does not match a field state that the processor is initialized to, the present invention senses the state mismatch and adjusts a display buffer by one display line, and the field is stored in the display buffer. The display buffer is adjusted in order to preserve a vertical spatial relationship between the top and bottom fields.

The invention discloses a method for reducing time delay and energy consumption in a dense wireless sensor network. The method comprises the following steps: according to the number of nodes in a forwarding set of a sender and the influence of the duty ratio of node work on delay; under the condition that the duty ratio of the nodes is not changed, the number of candidate nodes of a sender in thedense network is reduced, one-hop delay is reduced, and collision caused by simultaneous awakening of a plurality of candidate relay nodes is reduced, so that the data load capacity of the network isreduced, and the energy consumption of the network is reduced. And since the sending node selects the node closer to the convergence center as the relay node, the one-hop forward distance is increased, the hop count is reduced, and the end-to-end delay is reduced.

The invention discloses a method for multi-objective optimization opportunistic routing of an underwater sensor network, and the method comprises the following steps: 1), defining a multi-objective optimization opportunistic routing MOO-BA; (2) initializing an beacon, (3) carrying out dynamic life estimation DLE, (4) initializing a path, (5) carrying out group optimization problem solving, and (6)carrying out improved BA path optimization. The method can prevent the same node from consuming energy due to frequent data forwarding, achieve the purpose of energy consumption balance, prolong thenetwork life cycle, reduce end-to-end delay and improve the effective data packet transmission amount.

A vehicle networking information delay transmission method based on MSPA algorithm belongs to the field of automobile mobile internet, and is to solve the problem that the present information transmission cannot aim at a network disconnection-connection condition. The process comprises the following steps of: producing an original relay node; broadcasting an information packet by using the relay node; and once playing the information packet at every step of 2R distance. When the relay node queries running in the same direction into itself transmitting coil inner vehicle node, a speed that the transmitting coil inner vehicle node bears off the transmitting coil is updated and calculated, thereby selecting the vehicle node of the minimum speed as the subsequent same-direction relay node. Firstly, the information packet is broadcasted once, and then an authority packet is sent to the subsequent same-direction relay node. When the relay node queries to the reverse direction vehicle node and a flag bit in the information packet is zero, the relay node changes the flag bit in the information packet to 1, and the information packet is broadcasted once, and then the authority packet according to the positive direction rule in the reverse direction is sent to the subsequent reverse direction relay node. The vehicle networking information delay transmission method is used for vehicle networking transmission information under the state of network disconnection-connection.

A wireless communication system including a gateway device that connects a core network and a wireless access network. The wireless access network includes a virtual base station that includes a representative base station connected to the gateway device and a plurality of unrepresentative base stations, which are subordinate to the representative base station. The presence of the unrepresentative base stations is hidden from the gateway device and an adjacent base station.

A packet delivery method for packet radio networks. The method used to deliver packets between a first mobile station and a second mobile station in a packet radio network is characterized by, when the first mobile station has a plurality of data packets to the second mobile station, establishing a delivery path from the first mobile station (MS) to the second mobile station (MS) through a first base station system (BSS), a first Serving GPRS Support Node (SGSN), a second Serving GPRS Support Node (SGSN) and a second base station system (BSS); and when the second mobile station has a plurality of data packets to the first mobile station, the delivery path is established from the second mobile station (MS) to the first mobile station (MS) through the second base station system (BSS), the second Serving GPRS Support Node (SGSN), the first Serving GPRS Support Node (SGSN) and the first base station system (BSS).

The invention discloses a method for clustering artificial fish swarms in the Internet of Vehicles, a storage medium and a device. The method uses the adaptive value F of the artificial fish swarm algorithm to perform clustering in the Internet of Vehicles. The adaptive value F is determined by the vehicle node degree C and the vehicle node Mobility CR is jointly decided. The invention analyzes the urban intersection environment of the Internet of Vehicles, designs new cluster head evaluation parameters, and proposes a vehicle clustering method based on artificial fish swarms; the method screens out suitable clusters within the network through the behavior of artificial fish. Cluster heads, so as to obtain the optimal number of vehicle clusters; the research results show that compared with the well-known CLPSO algorithm, the method proposed in the present invention can generate fewer vehicle clusters, which means that it can better reduce communication overhead and reduce end-to-end end-to-end delay.

The invention discloses a method for realizing an MAC (Media Access Control) protocol under the long delay condition of an underwater sound sensor network. In the method, time is divided according to a time slot in a half-duplex communication mode based on a TDMA (Time Division Multiple Access) mechanism. According to the long propagation time delay characteristic of underwater sound communication and the space reusability of a channel, a node is allowed to transmit data to a node waiting for an answer acknowledgement frame, idle nodes in surrounding nodes are allowed to transmit data, and any node waiting for the answer acknowledgement frame is allowed to receive data. Due to the adoption of the method, the aim of making one node communicate with a plurality of nodes synchronously is fulfilled, the network throughput is increased, and meanwhile, the end-to-end delay of the network is lowered; and the method is suitable for the underwater sound sensor network and other long-propagation-time-delay communication networks, and has a higher practical application value.

According to the self-adaptive probability forwarding routing protocol of the underwater acoustic sensor network, the greedy progress is maximized, the efficiency of the forwarding set selection method is improved, the result of efficiently forwarding data packets is finally achieved, and it can be seen from the result that the proposed protocol maintains low energy consumption. The method is suitable for a sparse and topology-variable underwater network environment. The method comprises the following steps: firstly, dividing a forwarding region into a forwarding region and a non-forwarding region; compared with existing opportunistic routing transmission, the method has the advantages that waiting time is saved, end-to-end delay is greatly reduced, candidate set node selection is consistent, node selection fairness is guaranteed, an APFP protocol is achieved through NS2, simulation verification is conducted on the APFP protocol, and the method has obvious advantages.