536results about How to "Reduce overhead" patented technology

A virtualized computer system provides fault tolerant operation of a primary virtual machine. In one embodiment, this system includes a backup computer system that stores a snapshot of the primary virtual machine and a log file containing non-deterministic events occuring in the instruction stream of the primary virtual machine. The primary virtual machine periodically updates the snapshot and the log file. Upon a failure of the primary virtual machine, the backup computer can instantiate a failover backup virtual machine by consuming the stored snapshot and log file.

A non-volatile memory system is organized in physical groups of physical memory locations. Each physical group (metablock) is erasable as a unit and can be used to store a logical group of data. A memory management system allows for update of a logical group of data by allocating a metablock dedicated to recording the update data of the logical group. The update metablock records update data in the order received and has no restriction on whether the recording is in the correct logical order as originally stored (sequential) or not (chaotic). Eventually the update metablock is closed to further recording. One of several processes will take place, but will ultimately end up with a fully filled metablock in the correct order which replaces the original metablock. In the chaotic case, directory data is maintained in the non-volatile memory in a manner that is conducive to frequent updates. The system supports multiple logical groups being updated concurrently.

A system and method for establishing centralized, out-of-band access to remote network elements is provided. Status and other information can be securely retrieved from the remote elements. One or more servers observe and manage a plurality of remote elements using modem-to-modem communications between a modem bank and a remote modem. Requests are submitted through a central mediation point, thereby allowing central control of user profiles and a collection of security audit log information. One or more authentication mechanisms provide enforced security measures and trusted communication paths between a user and a remote element. Remote elements can be securely monitored and administered from a central location.

A system for transmitting data through a string of downhole components. In one aspect, the system includes first and second magnetically conductive, electrically insulating elements at both ends of the component. Each element includes a first U-shaped trough with a bottom, first and second sides and an opening between the two sides. Electrically conducting coils are located in each trough. An electrical conductor connects the coils in each component. In operation, a varying current applied to a first coil in one component generates a varying magnetic field in the first magnetically conductive, electrically insulating element, which varying magnetic field is conducted to and thereby produces a varying magnetic field in the second magnetically conductive, electrically insulating element of a connected component, which magnetic field thereby generates a varying electrical current in the second coil in the connected component.

A “row-diagonal” (R-D) parity technique reduces overhead of computing diagonal parity for a storage array adapted to enable efficient recovery from the concurrent failure of two storage devices in the array. The diagonal parity is computed along diagonal parity sets that collectively span all data disks and a row parity disk of the array. The parity for all of the diagonal parity sets except one is stored on the diagonal parity disk. The R-D parity technique provides a uniform stripe depth and an optimal amount of parity information.

The invention relates to a resource management method cluster of a data center based on the statistics in cloud computing environment, which comprises four steps of: 1. collecting work loads, application problem performance and resource use condition information; 2. inputting the information into a model and carrying out model analysis by using a statistic analysis method KCCA (Kernel Canonical Correlation Analysis) and remote-distance relative algorithm; 3. classifying work modes according to the current environment, and regulating the resource distribution according to control parameters; and 4. regulating the resource distribution according to the controller output and simultaneously updating the resource states. The resource management method of the invention firstly considers the characteristic that the work loads of the novel data center in the cloud computing environment are continuously changed, the real-time monitoring and the elastic management are carried out on the resources of the data center according to user requirements and the resource use conditions to ensure that the integral resource consumption can reach the minimum under the condition that the system performance is not influenced. The resource management method has wide practical value and application prospects in the technical field of elastic resource management of the cloud computing data center.

A apparatus and method for transmitting channel state information is disclosed. If an LTE-A system transmits a reference signal per subframe to support eight transmitting antennas, a problem occurs in that overhead is great. In order to solve this problem, a reference signal for channel measurement is transmitted per subband at different periods, or a user equipment scheduled for channel measurement uses a demodulation reference signal. The user equipment can notify a base station of channel measurement result using the demodulation reference signal in accordance with implicit or explicit signaling from the base station.

A scalable video bitstream may have an H.264/AVC compatible base layer and a scalable enhancement layer, where scalability refers to color bit-depth. According to the invention, BL information is bit-depth upsampled using separate look-up tables for inverse tone mapping on two or more hierarchy levels, such as picture level, slice level or MB level. The look-up tables are differentially encoded and included in header information. Bit-depth upsampling is a process that increases the number of values that each pixel can have, corresponding to the pixels color intensity. The upsampled base layer data are used to predict the collocated enhancement layer, based on said look-up tables. The upsampling is done at the encoder side and in the same manner at the decoder side, wherein the upsampling may refer to temporal, spatial and bit depth characteristics. Thus, the bit-depth upsampling is compatible with texture upsampling.

Overhead related to precoding (beamforming weight) information to be notified over a backhaul may be reduced while maintaining an ICI reduction effect by coordinated CoMP among a plurality of nodes. A communication apparatus of the invention includes a reception unit that receives precoding information from user equipment, a selection unit that variably controls an amount of the precoding information, which is to be notified to another communication apparatus via a backhaul, in response to positions of frequency resources, and a transmission unit that transmits the precoding information to the other communication apparatus in accordance with the amount of the precoding information controlled by the selection unit.

An approach for routing over a radio network is provided. A terminal receives a packet over the radio network, which supports meshed connectivity, wherein the packet is destined for a destination host. The terminal determines whether the destination host is reachable by a communication interface based upon a route table, and selectively redirects the packet over the radio network according to the route table. A route server is provided to collect routes from the terminal as well as other terminals within the radio network. The route server then disseminates the collect routes to the terminals for updating of their respective route tables. The present invention has particular applicability to a fully meshed satellite network.

A multi-hop wireless Ad-Hoc network according to the present invention employs a voice reservation protocol. The protocol supports voice and data communication and incorporates retransmission and acknowledgement mechanisms. A TDMA frame architecture is dynamically selected depending on voice mode operation (e.g., simplex/duplex) and associated retransmission/acknowledgement mechanisms. A source node transmits a reservation packet that embeds TDMA frame architecture and other information. The packet is transmitted to a destination node and is further piggybacked on existing neighbor discovery packets to reduce overhead. Each intermediate network node along the propagation path determines the manner in which to accomplish slot reservation based on the embedded information in the reservation packet. The protocol may use separate dedicated channels or a single channel for voice and data, and supports voice/data load balancing over different channels. In addition, the protocol may utilize speech silence and increased communication reliability to enhance performance.

The invention relates to a P2P traffic management apparatus and method. A P2P flow agent monitors an executed application program to extract a P2P application program, adds application identifiers to packets generated by the application program according to a set policy, and transmits the packets. In this case, a P2P security gateway monitors the inflowing packets from the P2P flow agent to extract packets having the application identifiers, uses the extracted application identifiers to inquire and acquire a related policy, and controls the packets according to the acquired policy.

Methods and apparatus are provided for the efficient use of cognitive radios in the performance of dynamic spectrum access. This includes spectrum sensing algorithms, adaptive optimized sensing of parameters based on changing radio environments, and identifying vacant channels. Protocols for switching communication links to different channels, and synchronizing communicating nodes in order to maintain reliable connectively while maximizing spectrum usage are also provided.

Methods, systems, and computer readable media generalize control registers in the context of memory address translations for I/O devices. A method includes maintaining a table including a plurality of concurrently available control register base pointers each associated with a corresponding input/output (I/O) device, associating each control register base pointer with a first translation from a guest virtual address (GVA) to a guest physical address (GPA) and a second translation from the GPA to a system physical address (SPA), and operating the first and second translations concurrently for the plurality of I/O devices.

In the invention, at transmitting terminal, the original information treated with carrier modulation is serial-parallel converted into several branch data streams whose amounts are identical with the amounts of antennas; the branch data streams and frequency-domain pilot frequency sequence are commonly mapped into the data position corresponding to the preset frequency-domain pilot frequency pattern; generating each antenna data information which is processed with OFDM modulation and is transmitted by RF transmission. At receiving terminal, each antenna receives the RF signals and generates time-domain output sequence the time-domain output sequence is correlated with the reference sequence to construct synchronous objective function between each pair of antennas so as to implement the synchronization between time and frequency.

Disclosed is a system and method for allocating and indicating a ranging region in which a base station (BS) allocates and indicates a ranging region in a broadband wireless access (BWA) communication system. The method includes: ranging region allocation and change indication information in a first region of every downlink frame; determining whether to include information necessary for performing ranging in a broadcast message that is broadcast through a second region of every downlink frame according to the ranging region allocation and change indication information; and allocating a ranging region in an uplink frame according to the ranging region allocation and change indication information.

Methods and apparatus are described for optimizing a circuit design. A gate level circuit description corresponding to the circuit design is generated. The gate level circuit description includes a plurality of pipelines across a plurality of levels. Using a linear programming technique, a minimal number of buffers is added to selected ones of the pipelines such that a performance constraint is satisfied.

A method (300) and a corresponding system for allocating resources in a hierarchical data processing system are proposed. The system includes a plurality of nodes that are arranged in a tree. Each leaf-node, or client, controls corresponding local resources, while each intermediate node, or domain manager, controls global resources that are visible to all its dependent nodes; the global resources defined on a root node, or master domain manager, are then visible to all the nodes of the system. Whenever a job, being submitted (306) on a generic client, requests a set of resources for its execution, the request is sent (309,318,327) through the tree to the master domain manager. The master domain manager allocates (339) the corresponding global resources as soon as they are all available; this event enables (345) its child node (in a path to the client) to perform the same operations, and so on down to the client itself. Once the client has allocated (357) the corresponding local resources, the execution of the job can be launched (360).

The invention discloses methods for sending, receiving and transmitting downlink control information (DCI) and related devices. More specifically, the sending method comprises: a base station sends DCI to user equipment (UE) on N subcarriers corresponding to a subframe through a physical downlink control channel (PDCCH), wherein the N is a positive integer and the PDCCH is located at one or two slots in the subframe; when the PDCCH is located on the one slot in the subframe, a time domain termination position of the PDCCH is a last orthogonal frequency division multiplexing (OFDM) symbol of the slot; and when the PDCCH is located on the two slots in the subframe, the time domain termination position of the PDCCH is a last OFDM symbol of the subframe. According to the invention, sending, receiving and monitoring of DCI are carried out in the scene of indoor hotspot coverage of long term evolution (LTE); and moreover, transmission with low cost, rapid rate and high reliability is realized.

An apparatus and a method for transmitting power information by a mobile station in a multiple component carrier system includes: obtaining power headroom that is a difference between maximum transmit power of a mobile station for each component carrier and power estimated for actual uplink transmission; configuring an identification field that identifies a component carrier that the power headroom is for; configuring power headroom fields that indicates a level of power headroom; and generating a medium access control protocol data unit (MAC PDU) including the identification field and the power headroom field and transmitting the generated MAC PDU to a base station.

The invention relates to a safety defense system of a Website, comprising a flow tractor and a Web safety detector, wherein the flow tractor is connected with a DNS (Domain Name Server) and is used for receiving the DNS domain name analyzing request of a client from the DNS, analyzing the domain name into the IP address of the Web safety detector and then returning to the client; and the Web safety detector is used for receiving HTTP (Hyper Text Transport Protocol) request information and carrying out intrusion detection on the HTTP request information, if no abnormal phenomenon is found, transmitting the HTTP request information to the Website pointed by the HTTP request information. The arrangement position of the safety defense system is not limited by serial arrangement and supports distributed arrangement, the configurations of the Web client and the Web server do not need to be modified so that the cost of safety defense is saved, and the safety defense system has good compatibility and strong scalability.

A frame signal (100) for communicating payloads (104, 110) of data includes a first payload field (104) and a first header field (102) with a first frame type indicator (120). The frame signal (100) also includes a second payload field (110) and a second header field (108) smaller than the first header field (102) that includes a second frame type indicator (128). The first payload field (104), first header field (102), second payload field (110), and the second header field (108) are encapsulated in a single frame (100) to provide multiple payload delivery with reduced overhead compared to individually transmitted single payload frames.

Embodiments of the invention provide methods and apparatus for improving the performance of file transfer to a client from a distributed storage system which provides single name space to clients. In one embodiment, a system for providing access to files in a distributed storage system comprises a plurality of storage nodes and at least one computer device connected via a network. Each storage node is configured, upon receiving a file access request for a file from one of the at least one computer device as a receiver storage node, to determine whether or not to inform the computer device making the file access request to redirect the file access request to an owner storage node of the file according to a preset policy. The preset policy defines conditions for whether to redirect the file access request based on at least one of file type or file size of the file.

Provided is a method for transitioning between a distributed transmission mode and a localized transmission mode, including transmitting, by a Base Station (BS), a measurement control message to a User Element (UE), wherein the UE makes corresponding measurement and transmits a required measurement report message to the BS and the BS transmits a transition indicator message of new mode to the UE based on measurement report message sent from the UE; and commencing CQI reporting and a downlink transmission of a new mode between the UE and the BS. The BS can choose a more appropriate transmission mode for the downlink transmission based on changing characteristics of the channel in the time domain and the frequency domain.

The invention relates to a user terminal safety communication method in a platform of the Internet of Things, in particular to an implementation scheme for safety communication among multivariate and heterogeneous user terminals and platform servers. According to the method, a safe communication system model of the Internet of Things is established by mainly combining an ASN.1 (abstract syntax notation one) with safe encryption and decryption and authentication algorithms, so that a standard data packet structure is provided for authentication, interconnection and intercommunication among different programming languages, different operating systems, different types of computers and different types of hardware environments in the Internet of Things, and authentication and interactive both sides can be identified. Besides, a more efficient safety mechanism is introduced to enable different entities in the Internet of Things to be communicated safely, rapidly and reliably, so that resource cost and time delay during data transmission can be remarkably improved.

A circuit that supports multiple monitors, docking functions, and protected content via one cable. The circuit includes a receiver that receives multiple video streams, each including respective video data, a mux/demux, coupled to the receiver, that determines which video stream to display on a monitor, a low-voltage differential signaling (LVDS) converter, coupled to the mux/demux, that generates an LVDS signal based on the video data of the determined video stream, an LVDS serializer/deserializer, coupled to the LVDS converter, that generates a signal based on the LVDS signal and sends the signal to a display panel of the monitor for display, a transmitter coupled to the mux/demux, and a transmit physical interface (TPI) coupled to the transmitter. The mux/demux sends at least a remainder of the video streams to the transmitter, which sends them to the TPI, which transmits them as output, useable as input to further instances of the circuit.

Provided is a handover method of a wireless communication system using a hierarchical cellular scheme. In the method, signal quality of a serving node is measured, so that whether to start scanning for a handover is determined. When the scanning for the handover starts, signal qualities of a serving cell including the serving node and one or more neighbor cells are measured through a first preamble including a first identifier for distinguishing a cell. An intra-cell handover or an inter-cell handover is selected using the signal qualities of the serving cell and the neighbor cells. Therefore, a terminal can easily distinguish between the inter-cell handover and the intra-cell handover, and an overhead during a handover can be reduced because an intra-cell handover procedure is simplified.

The invention relates to an automatic operation maintenance monitoring system used for monitoring a target system. The automatic operation maintenance monitoring system comprises a data acquisition system (2), a data publishing system (3) and a UI sub-system (4); and the data acquisition system comprises a system operation condition monitoring module set (5), a service data monitoring module set (6), a configuration management module set (7), a system assisted module set (8) and a data service module set (9). The automatic operation maintenance monitoring system disclosed by the invention has the benefits that: the automatic operation maintenance monitoring system is a system for performing all-direction monitoring of the operation condition of the whole target system, and is a platform for effectively maintaining the target system, mastering the operation condition of the system and providing system abnormal alarm information; by means of the system, full-automatic real-time monitoring, real-time statistic and analysis of data, and clear and striking change display of the data can be realized; and thus, data analysis and problem improvement can be facilitated.

The invention relates to an intelligent monitoring method for an on-line examination. The method comprises the following steps of: storing verified biostatistics data, abnormality monitoring sample data and examination question data in a central station; inputting examinee biostatistics data at a remote examination station; comparing the examinee biostatistics data with the verified biostatistics data; recording examinee monitoring data in the examination process, comparing the examinee monitoring data with the abnormality monitoring sample data, and judging whether examinees have abnormal examination room behaviors or not; and monitoring and managing processes run at the examination station. By the method, the processes of verifying the identities of the examinees, handing out examination paper, monitoring an examination room and monitoring an examination system are automated, reliable and special examination environment is provided, and the examination can be reliably managed at the lowest cost.

The invention discloses methods for sending, receiving and transmitting downlink control information (DCI) and related devices. More specifically, the sending method comprises: a base station sends DCI to user equipment (UE) on a subframe through a physical downlink control channel (PDCCH), wherein downlink control information carried by one PDCCH is used for scheduling a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH) according to one or more of the following modes: scheduling a plurality of PDSCHs; scheduling a plurality of PUSCHs; scheduling one PDSCH, which is transmitted on multiple continuous subframes; and scheduling one PDSCH, which is transmitted on multiple continuous subframes. According to the invention, sending, receiving and monitoring of DCI are carried out in the scene of indoor hotspot coverage of long term evolution (LTE); and moreover, transmission with low cost, rapid rate and high reliability is realized.