462 results about "Transmission failure" patented technology

A home network system for controlling one or more home appliances connected to a network and a method for operating the same. If an alive message or a connection termination message is normally generated from the home appliance, or if the alive message or the connection termination message is not normally transmitted to a network manager due to a transmission failure in a communication path, the network manager automatically recognizes a network connection state of the home appliance using a network search process, performs a connection termination operation according to the recognized information, and updates network information, resulting in increased reliability and user's convenience of the home network system.

A method and apparatus for wireless communication may provide a multi-link PDCP sublayer (710) in a radio network controller (702) capable of allocating PDCP PDUs among a plurality of RLC entities (712) for use in a multi -point HSDPA network. Some aspects of the disclosure address issues relating to out-of-order delivery of the PDCP PDUs to a UE (610), such as unnecessary retransmissions. That is, the disclosed multi-link PDCP (710) may be capable of distinguishing between sequence number gaps that are caused by physical layer transmission failures and those caused merely by skew.

A method for lightpath restoration in a reconfigurable optical network comprises the steps of naming each network addressable element in said reconfigurable optical network, determining current topology in said reconfigurable optical network, determining current resources in said reconfigurable optical network, requesting establishment of a lightpath, requesting reservation of restoration capacity, allocating the lightpath, and reserving the restoration capacity. Also disclosed is a method for lightpath restoration that comprises the steps of reserving restoration capacity, detecting transmission failures in the reconfigurable optical network, handling exceptions as a result of transmission failures, and allocating transmission capacity.

An extended paging indicator-based adaptive discontinuous reception method is proposed so as to improve a power saving performance of a terminal in an asynchronous wideband code division multiple access schemes. To this end, a plurality of terminals for performing power saving receive an extended paging indicator for a discontinuous reception cycle, conform a type of a bit Run for configuring the extended paging indicator, and change the discontinuous reception period. In addition, the terminals set the discontinuous reception period update factor value to be varied according to the extended paging indicator as an initial value so as to determine a next paging occasion block, change the discontinuous reception period update factor value according to the paging indicator of the bit Run received from base station, and change the discontinuous reception period according to the variance of the discontinuous reception period update factor value. The extended paging indicator-based adaptive discontinuous reception method may improve transmission time delay and transmission failure probability performances for packet reception as well as a power saving performance in comparison with a conventional fixed discontinuous reception method.

A vehicle security system for use in a predefined area such as a car park includes an array of sensors (9) for receiving a vehicle alarm signal transmitted by radio frequency from a system-subscribing vehicle fitted with a transceiver (22) in the event of attempted vehicle tampering or removal. A control centre (12) receives alarm signals and communicates them to a user as an alarm message. Detection of radio frequency signal jamming or attempted jamming is achieved in one embodiment with noise detectors (39, 139) actively detecting jamming noise or alternatively an arrangement of transmitters and receivers using test transmissions therebetween, whereby transmission failure indicates jamming.

In a relay scheme, a wireless source apparatus, a wireless destination apparatus and a wireless relay apparatus cooperate for handling transmission failures by space/time diverse channels. In the case of the successful direct transmission, reduced or no additional overhead for the relay selection is incurred. Thus, for a good SNR between source and destination, the inventive protocol has similar performance as a standard approach. In the case of a transmission failure e.g., due to small scale fading, a transmission via a different communication path implementing spatial diversity via a selected relay is supported. The device is to only activate the overhearing of signals in case of weak signal quality between sender and receiver. This selection of relay devices is done by demand only. A specific protocol for the reservation of the wireless medium for the entire cooperative communication has been specified.

A multipath mitigation method consists of locating a multipath-invariant (MPI) point of an ideal autocorrelation function and measuring the distance between the MPI point and DLL. The same MPI point is located in a received correlation function, and the distance between the point and the DLL, now affected by multipath, is measured. The difference between the ideal distance and the actual distance is the code tracking error resulting from multipath. The error is subtracted from the computed pseudorange or used to control the DLL. The method can be used to reduce the effects of all types of tracking error sources, such as signal transmission failure or code noise.

The present invention provides the ability to use an existing store-and-forward messaging network such as an electronic mail system to replicate data between computer sites. The replication provided by the present invention can be used with software applications, such as workgroup applications, to replicate data located on multiple sites. Workgroup replication data is sent to other sites via electronic mail (“e-mail”) messages. The present invention provides reliability features to handle errors in electronic mail transmissions. For example, the present invention provides the ability to reassemble objects at a replication site such that an object and all of its dependencies exist prior to the object's use at the site. Messages referred to as “ACK” messages are used to communicate a site's state and to provide other control information. Each site maintains latency information to determine transmission failures.

The invention discloses a three-layer key encryption method and a bank transaction system, wherein the method comprises the following steps of: providing an initialized master key in a plaintext way; decrypting the ciphertext of the master key by using the initialized master key to generate the plaintext of the master key; and decrypting the ciphertext of a working key by using the plaintext of the master key to generate the plaintext of the working key. As the initialized master key in a three-layer key encryption system is dynamically updated, the initialized master key which is firstly generated through an encryption machine can fail after being used once only, and the internal control risk is effectively prevented. Simultaneously, the master key is replaced frequently, thereby effectively preventing data from being cracked, being tampered, causing transmission failure and other risks in the network transmission process. The three-layer key encryption method provided by the invention is particularly suitable for bank transaction systems and can effectively ensure the safety of transactions.

A data retransmission method for a confirmation information transmission is provided which improves reliability of information transmission by preventing the loss of data when a transmission of data from layer 3 fails in layer 2. When transmitting layer-3-data from layer 3 to layer 2, layer 2 initiates timer observation and simultaneously transmits confirmation data to layer 1. If this transmission fails, a reply from layer 1 cannot be received and a retransmission procedure also fails, layer 2 notifies layer 3 of transmission failure, and simultaneously discards the layer-3-data. Layer 3 retransmits to layer 2 the layer-3-data which it previously transmitted, and layer 2 again transmits confirmation data to layer 1. If this transmission succeeds, layer 2 terminates the timer observation and notifies layer 3 of the successful transmission.

The invention provides a GOA circuit including a plurality of cascaded GOA structural units. Each single GOA structural unit outputs a row scanning signal to a corresponding row of pixel unit in a display area of a display panel according to an Nth-level GOA structural unit. The Nth-level GOA structural unit includes a forward and reverse scanning control module, a node signal control input module, an output control module, a voltage stabilization module, a Q point pull-down module, a P point pull-down module, a gate signal pull-down module, a GAS signal action module and a bootstrap capacitor. The gate of a first thin film transistor of the voltage stabilization module is connected to a third GAS signal, the source is connected with the forward and reverse scanning control module and theQ point pull-down module, and the drain is connected with a first node. The third GAS signal is a VGH signal during touch screen scanning, and is a VGL signal during stop. By implementing the GOA circuit, the problem that the previous GOA circuit has insufficient maintenance capability during stop of the touch screen is avoided. The cascaded transmission failure risk of the GOA circuit is reduced,and the GOA circuit is more stable.

In a network environment, the Quality of Service becomes an important issue particularly for applications involved with real-time multimedia streaming. Any transmission failure may cause service disruption and the failure has to be quickly recovered to minimize the impact. A unified home networking standard based on existing media in home has been developed to meet the increasing demand for bandwidth, reliability and availability. However, the fault tolerant protocol adopted by the home networking standard is based on an advanced selective ARQ (Automatic Retransmission Request) protocol which may take hundreds of millisecond to establish a backup channel. Alternatively, a hot standby backup channel has to be used to achieve quick switch without data loss at the expense of increased power consumption by the hot standby channel. The present invention discloses a quick-switch modem that can quickly switch from a primary channel to a backup channel upon detection of transmission failure. The quick-switch modem contains an additional interface between the modems for the primary channel and the secondary channel. In order to achieve quick failure detection and data re-route, the quick-switch modem relies on lower layers of the network link to facilitate failure detection and data re-route. Consequently, the switching time is substantially reduced without the need of hot standby. Alternatively, the quick-switch modem can be configured for load sharing to enhance overall available bandwidth.

There is provided an optical signal transmission apparatus having a stable dispersion compensation function without unnecessarily controlling a compensation value even when a main signal quality is deteriorated due to a factor other than dispersion or in the case of a transmission failure. When it is determined that a signal quality is deteriorated due to dispersion of a fiber by determining a control mode of a variable dispersion compensator by means of optical noise information and received power information in addition to bit error information of a received signal, a compensation value of the variable dispersion compensator is varied and a compensation value other than the dispersion of the optical fiber is held to an existing set value.

In an embodiment, a method of determining whether to trigger an event based on data blocks having status data includes electronically receiving the data blocks over a channel, performing a data integrity check on the data blocks to determine whether a particular data block has a transmission fault, calculating a received error metric based on performing the data integrity check, and disabling an event trigger if the received error metric crosses a first error threshold.

The invention provides a method for dispatching a hybrid automatic repeat request (HARQ), which comprises the following steps: at least one HARQ process is reserved for semi-persistent dispatch; UE decodes the one-time HARQ transmission failure of one HARQ process in the reserved HARQ processes and a semi-persistent dispatching occasion occurs between the HARQ process and an occasion of the next HARQ retransmission; and the next HARQ retransmission is canceled by using dynamic dispatch to replace the semi-persistent dispatch or by still using the semi-persistent dispatch. The method for dispatching the HARQ is simple and clear and has convenient processing, high reliability and less delay.

A method for evaluating the performance of a wireless LAN (local area network) system having a single access point and a plurality of transmission terminals, which share the same radio channel, comprises the steps of dividing the plurality of transmission terminals into groups in accordance with radio conditions, calculating a transmission probability and a post-transmission failure probability for each group using a transmission rate, an error rate, and the number of terminals of each group, and calculating a throughput based on the transmission probability and post-transmission failure probability. According to this method, the performance such as the throughput can be evaluated in a wireless LAN system even before the wireless LAN system is constructed.

The invention provides a GOA circuit. According to the GOA circuit, an electric leakage inhibition module is arranged, and electric leakage of a first node is inhibited when an embedded type touch control display panel enters a stage in which a signal is interrupted and touch control scanning is carried out, so as to maintain high level of the first node, thereby reducing the risk of level transmission failure, and making the GOA circuit more stable.

The invention provides a magnetic levitation operation control system. The system comprises a central operation control system, a safety control center and a vehicle-mounted control system. The central operation control system completes operation planning, real-time scheduling, route presetting and turnout control of a maglev train, generates operation parameters and transmits the operation parameters to the safety control center; the safety control center is responsible for full-line access protection, full-line traction cut off, full line turnout protection, full line driving sequence control, full line train protection, the full line automatic driving, the full line speed curve monitoring and the full line positioning functions, and distributes operation data to a traction control system, a traction cut off unit, a turnout protection unit and the vehicle-mounted control system of full line all operation partitions. The centralized and unified safety control center is adopted to replace an original independent partition operation control system of each operation partition, signals of all the operation partitions are collected to the safety control center, signal interactions between adjacent operation partitions are eliminated, signal transmission faults are reduced, and the operation efficiency of the train is guaranteed.

Provided is a method for retransmitting packet in a Multiple Input Multiple Output (MIMO) system. The method includes: in a receiving block, decoding packets received from a transmitting block and detecting whether an error exists or not in the packets; if the error is detected, transmitting a negative acknowledgement (NACK) signal informing transmission failure of the packets to the transmitting block; calculating channel quality information (CQI) values for transmission-failed packets after performing successive interference cancellation (SIC) with respect to all antenna combinations to retransmit the transmission-failed packets; and selecting an antenna combination having CQI values of the transmission-failed packets which are equal to or greater than respective initial CQI values of the transmission-failed packets among the antenna combinations, and transmitting information of the selected antenna combination to the transmitting block.

In a relay scheme, a wireless source apparatus, a wireless destination apparatus and a wireless relay apparatus cooperate for handling transmission failures by space/time diverse channels. In the case of the successful direct transmission, reduced or no additional overhead for the relay selection is incurred. Thus, for a good SNR between source and destination, the inventive protocol has similar performance as a standard approach. In the case of a transmission failure e.g., due to small scale fading, a transmission via different communication paths implementing spatial diversity via a selected relay is supported. The device is to only activate the overhearing of signals in case of weak signal quality between sender and receiver. This selection of relay devices is done of demand only. A specific protocol for the reservation of the wireless medium for the entire cooperative communication has been specified.

The invention aims at providing a method and device for data backup in a dual-computer system environment. Compared with the prior art, the method comprises the steps that firstly, total data to be backuped in a target disk is sent to a backup storage device through a host computer, then write operation of the host computer or a slave computer to the target disk is obtained, to-be-backuped increment data corresponding to the write operation is sent to the backup storage device, and accordingly continuous protection is achieved in the process of shifting from the host computer to the slave computer without interrupting protection to the data in the target disk. In addition, when a network transmission failure occurs, the to-be-backuped increment data is marked, the marked to-be-backuped increment data is forwarded to a disk drive, sending of the marked to-be-backuped increment data to the backup storage device continues after network transmission is restored, and accordingly the reliability is improved.

The invention discloses a capability acquisition method for a multimode terminal. The method comprises the following steps that a base station transmits a first terminal capability request to the multimode terminal according to the type of a current system to acquire the current system capability of the multimode terminal after receiving an attachment request sent by the multimode terminal; and the base station processes initial attachment initiated by the multimode terminal according to the system capability. According to the method, the multimode terminal can only report the capability of the multimode terminal for the current system in an initial attachment process, so that the number of bytes of a multimode terminal capability reporting message is reduced, the multimode terminal capability reporting message transmission failure rate and retransmission times in the initial attachment process are reduced, and the access time delay of the multimode terminal is further shortened.

The invention discloses a retransmission method and a retransmission system for a radio link control (RLC) layer. The method comprises that: a transmitter transmits RLC data by a hybrid automatic repeat request (HARQ) entity, and a receiver fails to receive the RLC data and informs the transmitter of a data transmission failure of the HARQ entity; and the HARQ entity of the transmitter reports the data transmission failure to an RLC entity of the transmitter, and the RLC entity of the transmitter retransmits the RLC data failed to be transmitted by the HARQ entity of the transmitter. By the method and the system, interaction for the HARQ transmission failure is realized between the HARQ entity and RLC entity of the transmitter, so the message retransmission time of the RLC layer is effectively shortened, time delays of data services in high speed packet access (HSPA), evolved HSPA (HSPA+) and long term evolution (LTE) networks are effectively shortened, the fast message retransmission function of the RLC layer is realized, delay jitter caused by the wireless packet loss is reduced, and simultaneously, service downloading and uploading throughput is improved.

The invention discloses a hybrid automatic repeat request method based on a polarization code and a device using the same. The method comprises the following step: when repeat is initiated automatically under the condition of transmission failure, first transmission bit sequences polarization-coded at a certain code rate are linearly combined to get second transmission bit sequences, wherein the code rate of the second transmission bit sequences is lower than that of the first transmission bit sequences. The second transmission bit sequences are set to linear combination of the first transmission bit sequences. After second transmission, soft information received through two times of transmission is serially combined according to a certain way. Decoding is performed with a lower-rate and longer polarization code. Certain coding gain is achieved while diversity gain is obtained.