2354 results about "Network conditions" patented technology

A link-modifying web server automatically modifies links in each web page as it is served to a client browser. The web page is parsed for links, and the links are looked up in a link mapping database. A replacement field is read from the database. A link modifier alters the link using the replacement field to point to a different server at one of several content delivery providers. One of several replacement links can be selected from the link mapping database depending on network conditions and user account data. A replacement link to one content delivery provider can be chosen rather than another replacement link to a different content delivery provider when one provider's network is responding more quickly or has a lower cost. A provider monitor continuously checks provider performance at each of the content delivery providers. When one provider's network is slow or fails, the provider monitor instructs a delivery rule processor to choose link replacements at other content delivery providers. Thus the links in the web page served to the client are modified to point away from slow or failed providers.

A multimedia streaming apparatus and method by which multimedia data is adaptively transmitted according to the conditions of a network are provided. The multimedia streaming apparatus streams multimedia data corresponding to a predetermined QoS level in response to a parsing result of metadata corresponding to multimedia data intended to be provided and information on a network bandwidth measured by a client which receives the multimedia data. Accordingly, adaptive multimedia streaming corresponding to the bandwidth change of the network can be performed without imposing an additional burden on a server.

A system and method for assigning virtual machines to network interfaces. A first virtual machine is assigned to a network interface according to a first rule and a second virtual machine is assigned to a network interface according to a second rule. The assignment rules are dependent on network conditions as determined through at least one of the network interfaces. The first rule and the second rule may specify assignments differently, such that the same network conditions may result in different assignments for the first and second virtual machines.

Methods, apparatuses and systems that dynamically adjust the selection of differentiated network services for selected classes of traffic or network applications in response to changing network conditions or application performance levels.

A method and apparatus enforcing and improving end-to-end service quality, based on end-to-end service performance characterization of network conditions, for a convergence enabled end-user device during a user session for service.

A plurality of repeater servers form a shared content delivery network (CDN) to serve resources to clients on behalf of a plurality of content providers. First and second resources are associated with a first content provider, the first resource referencing the second resource. The second resource is associated with a domain of the shared CDN. Responsive to a request that causes the first resource to be served to a client from a server in a domain associated with the first content provider, a CDN server is identified in the domain associated with the shared CDN to serve the second resource to the client. The CDN server is selected based, at least in part, on load conditions on at least some of the CDN servers, and on the client's location. Responsive to the CDN server being requested to serve the second resource: if a copy of the second resource is available on the CDN server, the copy is served to the client from the CDN server; otherwise, the second resource is replicated on the CDN server and then served to the client from the CDN server.

A Quality of Experience (QoE) framework provides a technique to assess the end user experience in a mobile wireless communication environment, such as 2.5G or 3G networks, or in any other wireless or hardwired communication environment. The framework is usable in conjunction with media streaming applications and enables a combination of network layer, transport layer, codec layer, and application layer measurements in extracting results. The extracted results can be used to monitor and improve, if necessary, the end user experience over severely variable network conditions.

The present invention is based on a prefetching scheme consisting of two modules: a prediction module and a threshold module. After a use's request for a new file is satisfied, the prediction module immediately updates a database of history information if needed, and computes the access probability for each candidate file, where the access probability of a file is an estimate of the probability with which that file will be requested by the user in the near future. Next the threshold module determines the prefetch threshold for each related server, which contains at least one candidate file with nonzero access probability. The threshold is determined in real time based on then current network conditions. Finally, each file whose access probability exceeds or equals its server's prefetch threshold is prefetched. When prefetching a file, the file is actually downloaded if and only if no up-to-date version of the file is available on the local computer; otherwise no action is taken. Although web browsing is an important application for prefetching, the prefetch scheme of the present invention may be advantageously applied to any network application in which prefetching is possible.

A data networking system and method which allows efficient use of bandwidth for data streams such as video and audio. This invention allows network nodes to dynamically identify changing network conditions which are typical on wireless and power line networks. The system and method dynamically adapt to the changes which affect network bandwidth by changing compression rates, compression types, audio/video quality, motion masks, throughput for specific connections, or mass storage of data streams until the network is capable of sending the data. The result is an improved system that requires little or no user intervention as network conditions change.

Methods, apparatuses, and systems directed to cost-aware bandwidth management schemes that are adaptive to monitored network or application performance attributes. In one embodiment, the present invention supports bandwidth management systems that adapt to network conditions, while managing tradeoffs between bandwidth costs and application performance. One implementation of the present invention tracks bandwidth usage over an applicable billing period and applies a statistical model to allow for bursting to address increased network loading conditions that degrade network or application performance. One implementation allows for bursting at selected time periods based on computations minimizing cost relative to an applicable billing model. One implementation of the present invention is also application-aware, monitoring network application performance and increasing bandwidth allocations in response to degradations in the performance of selected applications.

An admission control and load balancing system controls admission of packet streams or calls to a network and balances the packet traffic across the network, improving quality of service. The system includes a central database which stores information including cost data associated with individual paths and links across the network. A processor, in communication with the database, coordinates the admission control and load balancing decisions, and updates of the database cost data to reflect the dynamic network conditions, based on input from appropriate data sources. In one embodiment, referred to as the exact algorithm, the database is consulted by the admission control points or gatekeepers prior to admitting each arriving packet stream, and the database contents are updated call-by-call to reflect the allocation of resources to each admitted stream. In another embodiment, referred to as the inexact algorithm, control decision as well as database updates occur on a periodic rather than on a call-by-call basis to promote better scalability. In this embodiment, the processor periodically calculates admission decisions based on cost data in the central database. These admission decisions are then periodically forwarded to a satellite database associated with each gatekeeper, for storage and use in admission decisions until the next update epoch.

A method for video playback switching in response to changing network conditions. The method includes accessing a server to retrieve respective index files for a low bit rate version and a high bit rate version of the video file, and instantiating a low bit rate media player and a high bit rate media. Playback of the video file is begun by the high bit rate media player streaming the high bit rate version from the server. Upon an indication of impeded network conditions, a transition point is selected, wherein the transition point indicates where downloading of the high bit rate version stops and where downloading of the low bit rate version begins. The low bit rate media player is then positioned to begin playback at the transition point. Playback of the video file is then switched to the low bit rate player upon encountering the transition point.

In one embodiment, a method for dynamic wireless resource utilization includes monitoring a wireless communication resource; generating wireless communication resource data; using the wireless communication resource data, predicting the occurrence of one or more holes in a future time period; generating hole prediction data; using the hole prediction data, synthesizing one or more wireless communication channels from the one or more predicted holes; generating channel synthesis data; receiving data reflecting feedback from a previous wireless communication attempt and data reflecting a network condition; according to the received data and the channel synthesis data, selecting a particular wireless communication channel from the one or more synthesized wireless communication channels; generating wireless communication channel selection data; using the wireless communication channel selection data, instructing a radio unit to communicate using the selected wireless communication channel; and instructing the radio unit to discontinue use of the selected wireless communication channel after the communication has been completed.

A credential security support provider (Cred SSP) is provided that enables any application to securely delegate a user's credentials from the client, via client side Security Support Provider (SSP) software, to a target server, via server side SSP software in a networked computing environment. The Cred SSP of the invention provides a secure solution that is based in part upon a set of policies, including a default policy that is secure against a broad range of attacks, which are used to control and restrict the delegation of user credentials from a client to a server. The policies can be for any type of user credentials and the different policies are designed to mitigate a broad range of attacks so that appropriate delegation can occur for given delegation circumstances, network conditions, trust levels, etc. Additionally, only a trusted subsystem, e.g., a trusted subsystem of the Local Security Authority (LSA), has access to the clear text credentials such that neither the calling application of the Cred SSP APIs on the server side nor the calling application of the Cred SSP APIs on the client side have access to clear text credentials.

The present invention proposes methodologies, a system and a secure spontaneous collaboration framework along with a suitable application and services suite for enabling new paradigm of social networking among users of handheld devices by bridging gab between infra-structure-based networks and mobile ad hoc networks. While supporting three different operating modes for the spontaneous collaboration that suits the user preference and network conditions, the proposed solutions hide the complexity of finding the right peer/device for spontaneous collaboration, self-organising the network to be formed on-demand, mitigating the security threat, being aware of user mobility for service continuity across wide variety of networks. Binding a given user to user's handheld device and specifying the number of applications/services enabling spontaneous collaborations that a given user is interested in are possible through user-profile creations. By taking a holistic view, the proposed solutions enable very practical, scalable, secure and economical spontaneous collaborations.

Methods, systems, and computer program products for improving network operations by dynamically deploying services (such as web services or other network-accessible services) in a computing network. A process is defined whereby conditions such as usage metrics for incoming client requests (or other network conditions such as load balancing considerations) are monitored, and used to trigger dynamic deployment of web services to locations in the network in order to improve efficiency (e.g. by reducing response time to the client and/or reducing the burden on the back-end computing system resources). Service requests are dynamically routed to the destination where the service resides, in a manner which is transparent to the client. In an optional aspect, programmatic replication of system upgrades may be implemented by redeploying services using this same dynamic deployment approach, enabling the complexity of upgrading previously-deployed software to be reduced significantly. As another optional aspect, previously-deployed software may also be automatically and programmatically undeployed using disclosed techniques.

A method and apparatus for managing a network includes detecting occurrence of a network event associated with a new network condition including unplanned and planned macro-events associated with network elements and communication links of the network. The network event is classified as being associated with at least one of a network element failure, communications link failure, and a security breach. In response to the network event exceeding a network degradation threshold, the network event is identified as a network degradation event, and an alert is sent to a network administrator to normalize the network degradation event.

A method and system optimizes the transmission of a downlink reference signal (DLRS) in a wireless communication system that uses orthogonal division multiple access (OFDMA) for the downlink. Each Node-B (base station) is capable of transmitting the DLRS reference symbols in different subframes of the OFDM radio frame and changing both the number and location of the subframes in response to changing network conditions. The network conditions include the number of terminals being served by the Node-B and multiple access interference (MAI) from adjacent Node-Bs.

A method and system for monitoring wireless network conditions. Two mobile stations are coupled with a computer. The first mobile station interacts with the network and thereby establishes diagnostic data concerning network conditions. The first mobile station then reports that diagnostic data to the computer. As the computer receives the diagnostic data from the first mobile station, the computer obtains location data indicative of the current location of the first mobile station. The computer then provides the diagnostic data and corresponding location data to the second mobile station, which in turn transmits the data to a remote entity via the wireless communications network. As the remote entity receives the data, the remote entity may generate output reports and alerts as desired. Conveniently, the combination of the mobile stations and computer may be mounted in a vehicle and carried around a geographic area, so as to automatically report diagnostic data to the remote entity from a variety of locations.

A system and method are described whereby an enhanced handoff scheme provides for monitoring of mobile device conditions and network conditions associated with a current access network attachment, as well as with a plurality of access networks on a preferred access network list, to proactively initiate a handoff operation, thereby preserving the QoS constraints necessary for seamless delivery of IP multimedia services. In an embodiment, each of the plurality of access networks is connected to an IMS core network, whereby a policy function receives quality of service constraints associated with the launched application from the mobile device and orders a list of preferred access networks accordingly. Preferably, the policy function selects an appropriate access gateway associated with a target access network based at least in part on the mobile device conditions reported by the mobile device and the access network conditions monitored by the policy function.

The invention discloses a high-efficiency anti-DDoS security gateway system, which can effectively detect and defend a DNS denial-of-service attack. The system comprises two core components, namely a detector and a filter. The system supports two deploying ways, namely serial connection and bypass. A detecting method is based on the self-learning network flow state statistic and characteristic disinterment, achieves the detection and positioning of the network abnormal flow by setting network performance parameter thresholds, and can effectively identify the suspected attack flow. A defending method carries out a thought of deep defense, and the system is deployed with two defense steps of attack characteristic defense and baseline defense so as to ensure the attack defending effect of thesystem under normal network condition and the basic defense capacity of the system in the individual and severe attack environment. The methods can effectively improve the security and attack resista nce of a DNS server and can ensure the normal operation of the DNS service.

A physical layer frequency translating repeater (600, 700) for use in a wireless network includes signal processor (710-714) coupled with a signal processing bus (711), a processor (627) and a memory (650). The physical layer repeater conducts physical layer repeating and selectively conducts layer 2 and possibly layer 3 functions depending on network conditions and other factors. A demodulator (623) can extract address information such as media access control (MAC) addressing to enable packets to be redirected, terminated, stored and forwarded, if necessary, based on network conditions.