7051 results about "Network delay" patented technology

The embodiment of the invention discloses a data transmission method, user equipment and a base station. The data transmission method, the user equipment and the base station are used for solving the problem about conflicts in the data transmission process under the condition of scene coexistence of different kinds of processing delay. The method includes the steps that the user equipment receives a control message sent by the base station, the control message is used for determining RTT length corresponding to data transmitted between the user equipment and the base station; the user equipment determines the RTT length corresponding to the data transmitted between the user equipment and the base station according to the control message; data transmission between the user equipment and the base station is achieved according to the RTT length.

A system and methodologies are disclosed for determining the geographic location of an Internet host. A first method infers host location based on the DNS names of the host of interest or other nearby network nodes. A second method employs network delay measurements from geographically distributed locations to triangulate the coordinates of the host. A third method couples partial host-to-location mapping information obtained from one or more sources with BGP or other routing information in order to infer location of the host of interest.

A method and system are provided for offsetting network latencies in an incremental processing of a search query entered by a user of a device having connectivity to a remote server over a network. The search query is directed at identifying an item from a set of items. In accordance with the method and system, data expected to be of interest to the user is stored in a local memory associated with the device. Upon receiving a key entry or a browse action entry of the search query from the user, the system searches the local memory associated with the device to identify results therein matching the key entry or browse action entry. The results identified in the local memory are displayed on a display associated with the device. Also upon receiving a key entry or a browse action entry of the search query from the user, the system sends the search query to the remote server and retrieves results from the remote server matching the key entry or browse action entry. The results from the remote server are merged with the results from the local memory for displaying on the display. The process is repeated for additional characters or browse actions entered by the user when he or she does not find the desired item on the display.

Traditional networked file systems like NFS do not extend to wide-area due to network latency and dynamics introduced in the WAN environment. To address that problem, a wide-area networked file system is based on a traditional networked file system (NFS / CIFS) and extends to the WAN environment by introducing a file redirector infrastructure residing between the central file server and clients. The file redirector infrastructure is invisible to both the central server and clients so that the change to NFS is minimal. That minimizes the interruption to the existing file service when deploying WireFS on top of NFS. The system includes an architecture for an enterprise-wide read / write wide area network file system, protocols and data structures for metadata and data management in this system, algorithms for history based prefetching for access latency minimization in metadata operations, and a distributed randomized algorithm for the implementation of global LRU cache replacement scheme.

A Fast method of retrieving Internet web pages based on pre-caching of web pages and their objects. Access by web browsers to these objects are faster since the objects are available in the web browser's local memory cache in advance of actually needing them. Thus, when the web browser needs these objects, no network delays are experienced due to having to get them from the web server located some distance away over the Internet. In addition, a computer efficient method is provided that allows for the statistical selection of which objects to pre-cache. This pre-caching method avoids excessive pre-caching of objects that are statistically insignificant but costly in their use of computer resources. Thus, with pre-caching only the objects most likely to be used in subsequent web browser interactions will take up the computer resources in the pre-caching process. A partial-intelligent method is also provided that allows for fast retrieval of complete web pages and their objects when statistical selection of objects can not be provided. In this method, all web page objects that makeup the web pages are pre-cached without consequence of their significance to subsequent web browser interactions. With partial-intelligent pre-caching, all web page objects have equal significance and all objects are pre-cached. Thus, making access to subsequent web pages very fast at the expense of not optimizing computer resource utilization.

A remote control station that controls a robot through a network. The remote control station transmits a robot control command that includes information to move the robot. The remote control station monitors at least one network parameter and scales the robot control command as a function of the network parameter. For example, the remote control station can monitor network latency and scale the robot control command to slow down the robot with an increase in the latency of the network. Such an approach can reduce the amount of overshoot or overcorrection by a user driving the robot.

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.

Techniques for removing delay fluctuations from network time synchronization so that timing packets that experience an inordinate network delay to not cause unneeded adjustments to a local clock. Time synchronization according to the present techniques includes measuring a network delay associated with a timing packet and discarding the timing packet if the network delay exceeds an adjustable threshold. The adjustable threshold enables balancing the quality of delay measurements in terms of delay fluctuation against the number of delay measurements that are sufficient to maintain time synchronization.

Methods and systems for accelerating data communication by reducing network latency particularly by data compression in which requested data is recursively compressed by an encoder and sent to the requester in codes which may or may not be understood by the requester. The requester can subsequently request data corresponding to unknown codes. The request-reply sequence is also recursive and continues until the requested data is present at the requester. To further accelerate communication, a persistently connected network is employed, together with a new socket layer capable of combining multiple messages from different machines, threads, and / or processes into single TCP / IP packets to be relayed along message hubs in the persistent network. These features are introduced singly and combined to create a new caching network. A new content distribution network can take advantage of these data communication improvements since requested content can be distributed in caches in a caching network.

Systems and methods for utilizing transaction boundary detection methods in queuing and retransmission decisions relating to network traffic are described. By detecting transaction boundaries and sizes, a client, server, or intermediary device may prioritize based on transaction sizes in queuing decisions, giving precedence to smaller transactions which may represent interactive and / or latency-sensitive traffic. Further, after detecting a transaction boundary, a device may retransmit one or more additional packets prompting acknowledgements, in order to ensure timely notification if the last packet of the transaction has been dropped. Systems and methods for potentially improving network latency, including retransmitting a dropped packet twice or more in order to avoid incurring additional delays due to a retransmitted packet being lost are also described.

Embodiments of the present invention disclose an information transmission method, a base station and a terminal. The method comprises the steps of configuring, by the base station, subcarrier spacing of at least one synchronization signal and a physical broadcast channel and quantities of symbols occupied by the synchronization signal and the physical broadcast channel, wherein the subcarrier spacing of the synchronization signal is 15*2m kilohertz, the subcarrier spacing of the physical broadcast channel is 15*2n kilohertz, and both m and n are integers less than or equal to 5 and greater than or equal to 0; according to a service delay demand, selecting one configuration for sending the synchronization signal and the physical broadcast channel; determining frequency domain positions and time frequency positions for sending the synchronization signal and the physical broadcast channel, wherein the frequency domain positions sending the synchronization signal and the physical broadcast channel are adjacent or at least some are identical, and the time domain positions sending the synchronization signal and the physical broadcast channel are adjacent or some are identical; and sending the synchronization signal and the physical broadcast channel to the terminal according to the selected configuration and the determined frequency domain positions and the time domain positions. Through adoption of the method, base station and terminal, the time delay for accessing the terminal to the cell is reduced.

In current multimedia communication systems using session initiation protocols such as SIP, a service change (e.g. adding a new media type to an existing multimedia conversation) entails significant delays and processor load in both clients and server. The current invention solves this by separating session signaling and media control signaling in different signaling channels (141,142) and by eliminating the need to re-establish SIP sessions for each service change. The application server (120) maintains a list of all media types supported by each multimedia client (110) involved in a multimedia conversation. Each multimedia client (110) requesting to send one or several media streams with different media types to one or several other multimedia client(s) negotiates with the application server (120) only. The inventive concept significantly reduces networks delays and speeds up the service change as perceived by the user. The invention is of interest for various multimedia conferencing applications.

A data processing apparatus in a network receives packet flows that are communicated between a first network node and a second network node, and comprises a clock and latency analysis logic configured for receiving a first data segment that has been communicated from the first node and forwarding the first data segment to the second node; storing a first time value of the clock in association with a first timestamp value obtained from the first data segment; receiving a second data segment that has been communicated from the second node and forwarding the second data segment to the first node; retrieving the first time value based on the first timestamp value; determining a second time value of the clock; and determining a first latency value by computing a difference of the second time value and the first time value. Thus end-to-end packet latency is determined by passively observing timestamp values.

The invention discloses a distributed mobile edge computing unloading method in an ultra-dense network architecture, belonging to the technical field of wireless communication network and cloud computing. The method includes the following steps: calculating the interference of mobile equipment, and if unloading is needed, carrying out computing unloading by selecting a strategy that meets the loadlimitation, interference limitation and delay limitation; further, when the energy overhead of the selected strategy is superior to a current computing unloading strategy, sending update request information to a currently-selected base station to request to update the own computing unloading strategy; after the mobile equipment acquires the information that the base station allows to update the computing strategy, notifying other mobile equipment that the current update opportunity has been acquired, and adopting the updated strategy in the next time slot; and if the mobile equipment does notacquire the update opportunity, maintaining the existing strategy in the next time slot. According to the method disclosed by the invention, the energy consumption in a computing unloading process can be effectively reduced under the premise of guaranteeing a certain delay limitation, the purpose of saving the energy consumption can be effectively achieved, and the good leading effect and applicability can be achieved.

A system for facilitating fairness in a multiplayer game includes a network entity (e.g., game server) capable of operating a game application that can operate a multiplayer game. A plurality of clients is associated with a network latency, and can communicate with the network entity across at least one network. The system further includes a time-delay module disposed between the clients and the game application. The time-delay module can receive a data packet associated with a particular client during play of the multiplayer game, and delaying the data packet for at least a portion of delay time associated with the particular client before passing the delayed packet to the game application or the particular client for processing. In this regard, the delay time is based upon the network latency of the first client and an effective network latency set based upon the network latencies of the plurality of clients.

The embodiment of the invention discloses a trunk communication system, a server and a communication method. The trunk communication system in the embodiment of the invention comprises a trunk application server, a home subscriber server, a signaling access and intercommunication gateway, a group management function module and a media resource processing module, wherein the trunk application server is used for receiving a call request of a first subscriber terminal forwarded by the signaling access and intercommunication gateway and transmitting a query message to the trunk management function module after determining that the call request is group call service; the group management function module is used for querying corresponding group information according to the query message; the trunk application server is also used for indicating the media resource processing module to establish carrier for the first subscriber terminal and other group members in the group information after receiving a return message of the group information and initiating a session setup request to the other group members in the group information. According to the embodiment of the invention, logic entity partitioning and system allocation are performed on an MCPTT (Mission Critical Push To Talk) frame to facilitate trunk delay optimization.

A system and method for performance modeling for an information technology (IT) system having a server(s) for performing a number of types of transactions includes receiving data for system topology and transaction flows and receiving performance measurement data for the IT system. The measurement data is clustered into multiple regimes based on similarities. Service demand and network delay parameters may be inferred based on clustered data.

A system and method for providing a digital In-Flight Entertainment (IFE) system in a vehicle, such as an aircraft, that is capable of presenting a video program and associated audio in a synchronized manner to a large number of individual video monitors and speakers. The system and method employ processing operations in at least one decoder of the IFE system, to perform operations such as adjusting a local clock based on a master clock, setting a delay time in relation to a master clock, and adjusting video and audio playback based on the delay, to substantially synchronize playback of the audio and video data by the audio and video players, to thus eliminate or at least minimize the negative effects of source and load based jitter, network delays, clock drifts, network errors and decoder buffering differences, on synchronizing video and audio playback.

The invention discloses a service suspension method, which comprises: when an user equipment stationed in a group field needs to initiate a circuit field service, the core net equipment of the group field reserves the group network resource of the user equipment according to received indication; when the user equipment is performing a service, saves the descending service data and / or stopping sending the up-link data of the user equipment, and converts to circuit field communication network to perform circuit field service; or, when the user equipment is not performing service, then converts to circuit field communication network to perform circuit field service. The invention further discloses a corresponding treatment system for returning the circuit exchange field service to the conventional network, a user equipment, an evolvement base station, a mobility management entity, a service gateway and a group data network. Applying the invention can reduce the time delay before CS service while processing CS fallback, and further avoids resource waste.

Controlling the flow of network traffic to avoid undesired delay in the transmission of timing sensitive packets is disclosed. A plurality of packets to be transmitted via a network transmission path is monitored. A time at which a timing sensitive packet will become available for transmission via the network transmission path is anticipated. The plurality of packets is controlled in light of the anticipated time so that packets other than the timing sensitive packet will not occupy the network transmission path at a time associated with the anticipated time. Approximating a maximum data transmission rate associated with a network transmission path by sending and analyzing receipt of a series of test packets is disclosed. Approximating a buffer size of a buffer associated with a network transmission path by sending and analyzing receipt of a series of test packets is disclosed.

The invention provides a fuzzy curve analysis based soft sensor modeling method using time difference Gaussian process regression, it is suitable for application in chemical process with time delay characteristics. This method can extract stable delay information from the historical database of process and introduce more relevant modeling data sequence to the dominant variable sequence. First of all, the method of fuzzy curve analysis (FCA) can intuitively judge the importance of the input sequence to the output sequence, estimate the time-delay parameters of process, and such offline time-delay parameter set can be utilized to restructure the modeling data. For the new input data, based on the historical variable value before a certain time, the current dominant value can be predicted by time difference Gaussian Process Regression (TDGPR) model. This method does not encounter the problem of model updating and can effectively track the drift between input and output data. Compared with steady-state modeling methods, this invention can achieve more accurate predictions of the key variable, thus improving product quality and reducing production costs.

A method of clustering communication nodes based on network attributes such as network delays and forwarding capacity; on communication interest attributes; and on application attributes such as quality of service preferences / constraints (e.g. end-to-end delay constraints, bandwidth constraints) in providing communications between users and application servers. A multi-attribute communication feature vector is formed. That vector is comprised of network attributes (such as available bandwidth, client location attributes in the IP map), communication interests attributes (client request for content updates, client subscription to specific data items or to a set of proximal data sources in network space or application / virtual space) and quality of service requirements (such as delay and loss constraints is used to from efficient group communication mechanisms for distributed collaborative applications. Then the multi-attribute communication feature vectors are clustered. The clustering methods for multi-type attribute feature vectors are: iterative clustering using a generalized distance space with normalized attribute subspace metrics; fusion clustering, and nested clustering.

The invention discloses a realizing method of stream media buffer transposition, which comprises the following steps: a request from a client side node is received, and the stream media object required by the client side node is obtained; whether the size of the stream media object required by the client side node is larger than current buffer space is judged, if the judgment result is yes, the transpositional factor of each stream media object stored in the buffer depending on the network delay, duplicate amount, size and popularity of the stream media object stored in the buffer is obtained, and the size of the transpositional factor corresponds to the size of the priority level that the stream media object should be transposed; the stream media object of the larger priority level in the buffer is transposed with the obtained stream media object. Meanwhile, the invention discloses a device and the system for realizing the stream media buffer transposition. The invention has the advantages of considering synthetically the factors affecting the buffer effect, optimizing the main performance indexes of the stream media server, and improving the utilization ratio of the resource.

A client device presents streaming media and includes a stream manager, a request accelerator, and a source component coupled to the stream manager and the request accelerator for determining which requests to make. A rate selection process can make rate decisions so that the buffer is filled when it is low, avoiding erratically changing rates and can choose the correct steady rate quickly. Multimedia download strategies can be used for HTTP that allow for accurate rate estimations, achieving link capacity even if network delays and packet loss rates are high, achieving timely delivery of the stream, and achieving relatively steady download rates with little short term variability. A receiver might use multiple HTTP connections, decompose media requests into smaller chunk requests, synchronize the connections using TCP flow control mechanisms, and request data in bursts. In addition, the receiver might use an HTTP pipelining process to keep the connections busy.

The invention provides a method for distributing contention resources. The method comprises the following steps that: user equipment (UE) receives contention resource information which is available for the UE and sent by an evolution node base (eNB) through a system broadcast and / or special signaling; and when needing to perform uplink transmission by using the contention resources, the UE selects a proper contention resource from the available contention resources according to a selection rule to perform the uplink transmission. By the embodiment, the eNB can send the contention resource information of the contention resources to the UE through the system broadcast and / or special signaling, so the UE can select the proper one from the contention resource information to perform the uplink transmission; and finally, the contention-resource-based transmission can be realized, and an aim of state switchover time delay of a long term evolution-access system is achieved.