150 results about "Bandwidth measurement" patented technology

Methods for testing network bandwidth availability in a non-intrusive manner. By implementing occasional, base-line bandwidth testing, a more accurate indication of actual transfer rate results. When an application dependent upon network bandwidth is first executed, a series of file transfers takes place utilizing a series of different sized pieces of content.

The present invention is directed to a intranet for providing on-demand Internet access to subscribers which includes a service node and a plurality of subscriber terminals coupled to the service node by corresponding xDSL lines. In turn, the service node includes a switch coupled to the xDSL lines, a gateway coupled to the Internet, a router which couples the switch to the gateway and a bandwidth measurement server coupled to the gateway. The bandwidth measurement server determines upload and/or download data transfer rates between the service node and requesting ones of said the subscriber terminals coupled thereto.

Via real time online bandwidth measurement, this method confirms the threshold value ssthresh. When the congestion window (CW) is less than a half of the threshold, the rule of exponent gain is followed. Otherwise CW gains each time a value of a half of difference of the threshold and CW (ssthresh-cwnd) to approach gradually the threshold. Until the difference is less than the regulation factor phi (ssthresh/2>= phi >=2). Then CW is set as the threshold value to enter the stage of avoiding congestion. This invention can reduce the happening of loss of several texts in a window at the slowly start stage, reduce the package loss rate and raise the net transferring ability.

A system for efficiently downloading a page of broadband content includes a mass storage device, a bandwidth measurement device, a download manager, and a presentation manager. The bandwidth measurement device determines the bandwidth of a network connection over which the content file will be downloaded by the system. The download manager retrieves and stores in the mass storage device a portion of the content file, the size of the portion determined responsive to the bandwidth determination made by the bandwidth measurement device. The presentation manager retrieves the stored portion of the content file from mass storage and displays the portion using a standard media player application.

A system for determining bandwidth in a hotspot is provided. The system includes a handset having an analyzer client operable to measure a bandwidth in the hotspot and a time and a location data related to the bandwidth measurement and an analyzer server operable to maintain the bandwidth, time, and location data received from the advisor client.

A method for replicating data between two or more network connected data storage devices, the method including dynamically determining whether to compress data prior to transmitting across the network based, at least in part, on bandwidth throughput between the network connected data storage devices. If it has been determined to compress the data, the method involves compressing the data and transmitting the compressed data over the network. If it has been determined not to compress the data, the method involves transmitting the data, uncompressed, over the network. Dynamically determining whether to compress data may include comparing bandwidth measurements with a predetermined policy defining when compression should be utilized. In some embodiments, the policy may define that compression should be utilized when an estimated time for compressing the data and transmitting the compressed data is less than an estimated time for transmitting the data uncompressed.

Systems and methods for midstream determination of varying available bandwidth for streaming content between two network entities are described. During content streaming, a client requests a server to surge the content transmission rate. One or more bandwidth measurements are taken during the surge to determine if the increased transmission rate can be adequately managed. If the increased transmission rate can be adequately managed, the client may request the server to transmit remaining content at a transmission rate that is not greater than the increased, or surged, transmission rate. In a multi-bitrate file scenario, the surge rate may be higher than the rate of the fastest useable stream. In such a case, the fastest useable stream is selected. If the increased transmission rate is not suitable for future transmission, then the rate may remain at the original transmission rate.

The invention relates to a high-efficiency single-end available bandwidth measuring method (pathpider) which comprises the following steps: a transmitting end transmits a specific probe packet train to a destination node; the transmitting end calculates a series of round trip time delay (RTT) values in accordance with a series of ICMP (Internet Control Message Protocol) packets returned by the destination node, and determines the time when the round trip time delay starts to remain constant; and the transmitting end calculates the average transmission rate of the packet train within the time period from the time when the packet train starts to be transmitted to the time when the round trip time delay starts to remain constant, and uses the average transmission rate as the measured value of the available bandwidth of the path. The invention can realize single-end available bandwidth measurement based on the novel probe packet train, and the available bandwidth value can be measured by only transmitting the probe packet train once. Thus, the invention has the advantages of high measurement accuracy, high convergence speed, low invasion degree and high robustness.

Presented are methods and systems for providing bandwidth estimation and correction in a communications network. Bandwidth estimation and correction can include calculating a round trip time (RTT) value and a packet loss rate (PLR) value for each packet of a set of packets transmitted at different points in time from a server to a client terminal over the communications network; determining a bandwidth estimate based on the RTT and PLR values for the set of packets transmitted; determining a bandwidth measurement based on the RTT and PLR values for the set of packets; and determining a corrected bandwidth estimate based on the bandwidth estimate and the bandwidth measurement.

A system for efficiently downloading a page of broadband content includes a mass storage device, a bandwidth measurement device, a download manager, and a presentation manager. The bandwidth measurement device determines the bandwidth of a network connection over which the content file will be downloaded by the system. The download manager retrieves and stores in the mass storage device a portion of the content file, the size of the portion determined responsive to the bandwidth determination made by the bandwidth measurement device. The presentation manager retrieves the stored portion of the content file from mass storage and displays the portion using a standard media player application.

The invention provides a method and a device for measuring bandwidth, wherein the method comprises the following steps: step S1, initializing a line bandwidth value as a bandwidth default value; step S2, periodically detecting the interface flow rate and recording the peak value of the interface flow rate, wherein the peak value of the interface flow rate is the maximum value of the interface flow rate detected from the initialization to the current moment; and step S3, adjusting the line bandwidth value according to the bandwidth default value, the current line bandwidth value and the peak value of the interface flow rate. The method records the maximum value of the interface flow rate detected from the initialization to the current moment, namely the peak value of the interface flow rate, and adjusts the line bandwidth value according to the bandwidth default value, the current line bandwidth value and the peak value of the interface flow rate, thus the adjustment of the line bandwidth does not independently depend on the peak value of the interface flow rate so as to avoid the problem that the actual bandwidth of a line cannot be characterized correctly because the bandwidth control is turned on so that the interface flow is suppressed.

The invention discloses a device for online message flow monitoring and bandwidth compensation, which comprises a message identification module 102, a message storage module 103, a message scheduling module 104, a bandwidth measurement module 105 and an inserted message generation module 107. The invention additionally discloses a method for online message flow monitoring and bandwidth compensation. The technical scheme of the invention is that service messages required to be compensated are determined in real time on the transmission path of the service messages, the bandwidth of the service messages is measured in real time and whether compensation messages are inserted or not is determined according to measurement results. The invention has the advantages that the compensation/insertion of large bandwidth testing message flow can be realized; the long-term and large-quantity message compensation can be conducted; and the bandwidth value of the interested service message flow can be monitored in real time and thereby the threshold-configurable bandwidth difference value flow compensation function can be completed.

The fast dynamic measurement of bandwidth in a TCP network environment utilizes a single pair of packets to calculate bandwidth between two entities on a network (such as the Internet). This calculation is based upon the packet-pair technique. This bandwidth measurement is extremely quick. On its journey across a network, communication devices may delay the packet pairs. In particular, TCP networks have two algorithms designed to delay some packets with the goal of increasing the overall throughput of the network. However, these algorithms effectively delay a packet pair designed to measure bandwidth. Therefore, they distort the measurement. These algorithms are Nagle and Slow Start. The fast dynamic measurement of bandwidth implements countermeasures to overcome the delays imposed by these algorithms. Such countermeasures include disabling the application of the Nagle Algorithm; minimizing the buffering of packets by sending a “push” packet right after the packet pair; and avoiding the Slow Start Algorithm by priming it with a dummy packet.

The invention relates to a single end network available bandwidth measurement method and a terminal adopting the same. The method comprises the steps as follows: a sending end sends detection stream to a receiving end periodically according to two ends of a given to-be-measured available bandwidth, and the receiving end is forced to return information stream to the sending end continuously; the sending end judges the relation between the sending rate and the real available bandwidth according to change of one-way time delay of the received information stream; and the sending rate is adjusted step by step according to a judgment result until an error between the sending rate and the real available bandwidth is in an acceptable range, and the final measurement value of the available bandwidth is obtained. With implementation of the invention, single end network available bandwidth measurement can be performed between any two nodes on a network.

A bandwidth meter method and apparatus for measuring the bandwidth of a spectrum of light emitted from a laser input to the bandwidth meter is disclosed, which may comprise an optical bandwidth monitor providing a first output representative of a first parameter which is indicative of the bandwidth of the light emitted from the laser and a second output representative of a second parameter which is indicative of the bandwidth of the light emitted from the laser; and, an actual bandwidth calculation apparatus utilizing the first output and the second output as part of a multivarible equation employing predetermined calibration variables specific to the optical bandwidth monitor, to calculate an actual bandwidth parameter. The apparatus and method may be implemented in a laser lithography light source and/or in an integrated circuit lithography tool.

The invention belongs to the field of network communication, and provides an online live broadcasting uploading method and system based on edge network polymerization. A video of a data source client can be transmitted to a network polymerization terminal, and the network polymerization terminal sends a request to a scheduling server; the scheduling server allocates an optimal polymerization server to the network polymerization terminal according to feedback information, network bandwidth measurement and the like of the network polymerization terminal and an original server; the network polymerization terminal transmits the video to the optimal polymerization server by at least one Wi-Fi and/or at least one LTE network link; and the optimal polymerization server transmits the video to the original server, and then the original server distributes the video to each data receiving side. By the online live broadcasting uploading method and system based on edge network polymerization, which are provided by the invention, transmission on mass data, i.e., bandwidth polymerization of the edge networks, by of a plurality of small-bandwidth edge networks is implemented, and scheduling is carried out according to different network link states, so that an uplink bandwidth is maximized.

The invention discloses a method for measuring available bandwidth by using mixed messages, which comprises the following steps: an active measuring end sends an internet control message protocol (ICMP) to a passive measuring end and accounts the network normal ICMP message packet loss rate of the passive measuring end; the active measuring end sends mixed messages to the passive measuring end and accounts the ICMP message average packet loss rate of the mixed messages of the passive measuring end and the active measuring end judges that the difference between the ICMP message average packet loss rate and the network normal ICMP message packet loss rate is greater than a preset packet loss rate threshold, the average speed of the passive measuring end receiving the mixed messages is accounted and used as the available bandwidth from the active measuring end to the passive measuring end. The invention also discloses a device for measuring available bandwidth by using mixed messages. The method and the device can be used for reducing the complexity of bandwidth measurement.

The invention relates to a SDN (Software Defined Network) network abnormality monitoring method. An operation condition of a network path is analyzed in two aspects of delay and an available bandwidth of the path, and the abnormal path is detected and alarmed so as to ensure normal operation of the network path. The SDN network abnormality monitoring method adopts four functional modules: a network topology management module, a path delay measurement module, a path available bandwidth measurement module and a path abnormality monitoring module. According to the SDN network abnormality monitoring method disclosed by the invention, not only can delay and the available bandwidth of the network path be effectively measured, but also a path abnormal condition generated in the network transmitting process can be timely found and an alarm signal can be sent out. The SDN network abnormality monitoring method, under both network conditions of continuous network traffic and varied network traffic, can effectively complete abnormality monitoring on the network path and the measurement work on performance parameters.

The invention provides an optical signal-to-noise ratio (OSNR) test method. The method includes: determining the number of subcarriers in multi-subcarrier multiplexing super channels and measuring central wavelength and effective bandwidth of the subcarriers; subjecting each subcarrier to OSNR measurement which includes that the OSNR of the subcarrier is measured in the effective bandwidth at the central wavelength location, and the effective bandwidth is the effective bandwidth acquired during performing the effective bandwidth measurement on the subcarrier; acquiring the multi-subcarrier multiplexing super channels according to the OSNRs of the subcarriers and the number of the subcarriers acquired in measurement. On the basis of the method, the invention further provides an OSNR test device. By the method and the device, the reliable OSNRs of the multi-subcarrier multiplexing super channels can be acquired.

The invention provides a network bottleneck bandwidth measurement assessment method based on active measurement and a packet gap model. According to the method, on the basis of the packet pair measurement technology principle, a three-time handshaking interaction consultation method regulated by a TCP is utilized for improving and optimizing an AllBest algorithm. A data packet pair model is adopted in the method for transmitting data packet pairs in two combination forms alternatively to the opposite terminal in a network, and the transmitting terminal tests and estimates a bottleneck bandwidth of a transmission link according to two-way transmission time and the packet length of a TCP response message returned by the opposite terminal from transmitting to receiving. The method overcomes the defects that an ICMP response message is too long, and transmission delay for returning to the transmitting terminal of a feedback message responded by the opposite terminal can not be omitted, and can achieve single-terminal deployment and fast measure the bottleneck bandwidth of the transmission link, so that practicality and accuracy of network measurement are effectively improved.