32results about How to "Reduce protocol overhead" patented technology

A bi-directional reflective memory channel between a pair of storage controllers is used to maintain a mirrored copy of each storage controller's native buffer contents within the buffer of the other storage controller. To maintain such mirrored copies, buffer write operations that fall within a reflective memory segment of one storage controller are automatically reflected across this channel to the other storage controller for execution, and vice versa. The write operations are preferably transmitted across the reflective memory channel using a protocol that provides for error checking, acknowledgements, and retransmissions. This protocol is preferably implemented entirely in automated circuitry, so that the mirrored copies are maintained without any CPU intervention during error-free operation. When a failover occurs, the surviving storage controller uses the mirrored copy of the failed storage controller's native buffer contents to assume control over the failed storage controller's disk drives.

A system and method are provided for aggregating Multimedia over Coax Alliance (MoCA) Medium Access Control (MAC) frames. The method sends a Multiframe Reservation Request (MRR) requesting a transmission time slot, and receives a grant in response to the MRR. Subsequent to sending the MRR, a plurality of MoCA MAC frames are accepted and assembled into a physical layer (PHY) burst packet that is transmitted in the granted time slot. A method is also provided for bundling client data packets into a MoCA MAC frame. The method sends a Bundledpacket Reservation Request (BRR) requesting a transmission time slot, and receives a grant in response to the BRR. Subsequent to sending the BRR, a plurality of client data packets are accepted and concatenated into a bundled MoCA MAC frame. The bundled MoCA MAC frame is transmitted in a PHY packet in the granted time slot.

The invention discloses a mixed media access control method of a wireless network. System channels are of time slot, and time slots with fixed cycle are distributed to non-competitive business nodes, non-competitive business data frame is transmitted in the mode of time division multiple access. Competitive business nodes transmit competitive business data frame in the competitive time slots by using the method of random competitive access. After the competitive business data frames conflict, the competitive business nodes send the competitive business data frame again under the condition that the estimated gain value of the channels is more than or equal to a given threshold. Or else the competitive business data is forwarded by a relay node; an access point buffers the signals received before, and realizes the data frame separation by methods of serial interference cancellation and minimum mean-square error detection. At the same time, a superimposed pilot channel estimation method is used by the competitive business data, no additional time slot is needed in the method, thus being convenient for orthogonal design. The method is suitable for the unexpected properties of competitive businesses and the cyclical properties of non-competitive businesses, and the mixed transmission of the two businesses can be supported.

A computer system architecture and memory controller for close-coupling within a hybrid computing system using an adaptive processor interface port (“APIP”) added to, or in conjunction with, the memory and I/O controller chip of the core logic. Memory accesses to and from this port, as well as the main microprocessor bus, are then arbitrated by the memory control circuitry forming a portion of the controller chip. In this fashion, both the microprocessors and the adaptive processors of the hybrid computing system exhibit equal memory bandwidth and latency. In addition, because it is a separate electrical port from the microprocessor bus, the APIP is not required to comply with, and participate in, all FSB protocol. This results in reduced protocol overhead which results higher yielded payload on the interface.

A method, apparatus, and computer program product are provided for routing data packets through a wireless sensor network to a mobile sink in a relatively quick and efficient manner while utilizing low protocol overhead. Additionally, a method, apparatus, and computer program product are provided such that a sensor node within a wireless sensor network maintains sink information and routing information to facilitate efficient delivery of a data packet to a mobile sink within a wireless sensor network.

A communication system and a method for operating a communication system, the communication system having a CAN bus and at least two devices connected with the aid of the CAN bus. Such a device has a CAN control unit, an asynchronous, serial communication (ASC) interface unit, and a switch. The CAN control unit is suitable for transmitting, in a first transmission mode, CAN data frames over the CAN bus with the aid of a first physical protocol. The asynchronous, serial communication interface unit or ASC interface unit is suitable for transmitting, in a second transmission mode, ASC data frames over the CAN bus with the aid of a second physical protocol. The switch is designed for switching over between the first transmission mode and the second transmission mode as a function of at least one agreement effective between the device and at least one other device.

The present invention relates to a method for routing at least a data packet in a wireless sensor network (10), the wireless sensor network (10) comprising: at least a source node (S) that is configurable to transmit at least a data packet; at least a destination node (D) that is configurable to receive the data packet transmitted by the source node (S), and interconnectable network nodes (s_i) between the source node (S) and the destination node (D) that are configurable to receive and forward the data packet, the method comprising the steps of: operating the network nodes (s_i) according to a sleep-active schedule comprising at least a sleep mode and an active mode, and configuring the network nodes (s_i) to have information on their own geographic location and the geographic location of the destination node (D), the method further comprising the steps of: dividing the wireless sensor network (10) into a plurality of disjoint areas (A₀, A_M-1, A₁, A₂) that are separated by boundaries; separating each area (A₀, A_M-1, A₁, A₂) into at en least two regions, the regions being an inner boundary region (I), a central region (C) and an outer boundary region (O); selecting forwarding nodes out of the network nodes (s_i) to route the data packet from the source node (S) to the destination node (D), such forwarding nodes being selected on the basis of their geographic location relative to the destination node (D) and the network nodes being synchronised relative to each other, and configuring the sleep-active schedule such that only those forwarding nodes that are selected to route the data packet in a given time window are operable in the active mode and all the other network nodes (s_i) are operable in the sleep mode.

The layer processing includes at least processing on a first, a second and a third layer. At the transmitter side, the third layer receives a packet, adds its header and forwards the packet to the second layer. The second layer performs segmentation and provides segmented data to the first layer, which maps the segmented data onto physical resources. The segmentation is based on the allocated resources. Retransmissions may take place on the third layer and thus, the third layer may re-segment the packet according to the received feedback for particular segments and provide the re-segmented data to the lower layers. Alternatively, the feedback information is provided to the second layer which then performs the segmentation by taking it into account. Correspondingly, the receiver performs re-ordering and re-assembly at the third layer for which it receives also control information from the second layer.

A communication system having one CAN bus and at least two devices interconnected by the CAN bus is described, at least one of the devices including: i) a CAN controller, which is suitable for transmitting CAN data frames over the CAN bus using a first physical protocol in a first operating mode; ii) an asynchronous serial communication interface unit, which is suitable for transmitting ASC data frames over the CAN bus using a second physical protocol in a second operating mode; iii) a first switching means, which is suitable for switching the first operating mode and the second operating mode depending on at least one agreement in effect between the device and at least one of the other devices; and iv) another switching means, which is suitable for switching the device to a third (restricted) operating mode, which differs from the first operating mode and the second operating mode, for powering up the device.

The invention discloses an on-line breaker monitoring device based on a GOOSE message frame polymerization technology. The device comprises a switch state monitoring loop, an adjustment circuit, a first A/D conversion circuit, an FPGA (field programmable data array) and a DSP (digital signal processor) /ARM dual-core operation system, wherein the switch state monitoring loop is connected with the input end of the FPGA through the adjustment circuit and A/D conversion circuit; the output end of the FPGA is connected with the input end of the DSP/ARM dual-core operation system through the address bus of a data bus; the DSP/ARM dual-core operation system comprises an SDARM (synchronous dynamic random access memory), a FLASH, a serial interface, a JTAG (joint test action group) debugging port, anoptical Ethernet port, an Ethernet port, a reset watchdog, a second A/D conversion circuit, a crystal oscillator and a power supply. By using the device provided by the invention, the data transmission is quick in speed and reliable; and the device can meet the instantaneity requirement of massage transmission, reduce the expense on Ethernet protocol, and reduce the massage length and the massage transmission time relay.

A traffic self-adaptive energy-saving media access control method relates to media access control methods. According to the method, an MAC (Media Access Control) protocol for energy saving according to the flow of a physical layer, namely, TAE-MAC (Traffic Adaptive Energy-saving-Media Access Control) is used; the TAE-MAC uses an RTS (Request to Send)/CTS (Clear to Send) reservation mechanism, a data frame DS (Data Structure) is constructed for completing and achieving RTS/CTS reservation and confirmation, a non-competitive TDMA (Time Division Multiple Access) protocol is used for achieving wireless channel access control, the operation mechanism of wireless nodes is divided into two parts of an active stage and an inactive stage, and the TAE-MAC protocol is used for nodes for achieving the wireless channel access control of the nodes when the data frame DS is transmitted for completing a handshake. The traffic self-adaptive energy-saving media access control method based on characteristics of wireless industrial control networks can effectively solve the problem of energy saving of wireless nodes in industrial environments, can effectively prolong the service life cycle of a wireless control network, and relieves the application blocking of a wireless network in the field of industrial control due to the energy problem.

The technology disclosed herein enables reduction of secure protocol overhead when transferring packets between guest elements on different hosts. In a particular embodiment, the method provides, in a first virtual network interface of a first guest element, receiving one or more first packets from a first guest element directed to a second guest element. In response to determining that the first packets will be encapsulated in a secure protocol having a first integrity check procedure provided for by the secure protocol, the method provides refraining to perform a transmit-side portion of a second integrity check procedure on the first packets as provided for by a transport protocol. The method further provides passing the first packets to a first host of the first virtual network interface in the transport protocol.

A wireless flight sensor system that incorporates a network of wireless sensors all in communication with a sensor gateway, the gateway in turn being in communication with a flight network. The sensor gateway includes a software defined radio (SDR) by which sensors communicate. The SDR is easily reconfigurable to accommodate new wireless technology. The flight network software (FNS) comprises a modular software architecture with a management repository, a traffic manager, a wireless interface controller, and a sensor database. The resulting system is both scalable and easily reprogrammable to accommodate a wide variety of current and future wireless sensing capability.

The invention relates to the technical field of spatial data processing, and provides a spatial data processing node device based on CCSDS specifications. The system comprises a forward link basebandprocessing module, which is used for completing baseband data processing functions of a forward link, including data caching, state monitoring, frame conformance detection, channel receiving processing and data output processing; a return link baseband processing module which is used for completing baseband data processing functions of a return link, including data caching, channel multiplexing, data routing, packet analysis, service data priority scheduling, security processing, flow control and channel sending processing; and a parameter configuration and health telemetry module which is used for completing parameter configuration and health telemetry management functions through a bus. The space data processing node device based on the CCSDS specification is designed and completed by adopting the programmable logic FPGA, the direct transmission of space data is achieved, the protocol expenditure is saved, and the data processing delay is reduced.

The invention discloses a node device of a sensing network capable of supporting sensing access and optical packet transmission. The node device acquires sensing data from sensing equipment through a wired or wireless sensing interface; a uniform data frame is formed in a control scheduling module; storage equipment is used for caching high-speed data and scheduling a queue; the data are sent to a service layer through a service interface according to a service demand or sent to other nodes through an optical packet transmission subsystem. According to the node device, the sensing access and the optical packet transmission are combined together; an open sensing access mode is supported; data exchange among the nodes are realized by an asynchronous optical packet exchange mode, thus realizing transmission of the high-speed data among the nodes; the problem of confliction in multi-path optical data transmission is solved through the designed optical packet transmission subsystem; the diversity and the instantaneity of sensing network service are effectively guaranteed.

A method and a device for data processing are provided the method comprising the steps of (i) data is sent from a first network component to an at least one second network component via at least two lines; and (ii) the first network component transmits a measurement tag via at least one line of the at least two lines.