289 results about "Successful transmission" patented technology

A data transmission system using a human body as a signal transmission path includes a transmitter and a receiver. The transmitter uses a pair of electrodes which are held in close proximity to the skin of the human body. The transmitter transmits data to the receiver through the signal transmission path partly extending through the human body when a user carrying the transmitter touches a touch electrode of the receiver. The electrodes are integrated into a garment worn by the user in such a manner that the electrodes are kept in a closely facing relation to the skin of the user, thereby establishing the electrical path extending through the human body. With the integration of the two electrodes into the garment, the user wearing the garment as an everyday clothes or uniform can be easy and convenient to carry the transmitter for successful transmission of the data.

A data transmission system using a human body as a signal transmission path includes a transmitter and a receiver. The transmitter uses a pair of electrodes which are held in close proximity to the skin of the human body. The transmitter transmits data to the receiver through the signal transmission path partly extending through the human body when a user carrying the transmitter touches a touch electrode of the receiver. The electrodes are integrated into a garment worn by the user in such a manner that the electrodes are kept in a closely facing relation to the skin of the user, thereby establishing the electrical path extending through the human body. With the integration of the two electrodes into the garment, the user wearing the garment as an everyday clothes or uniform can be easy and convenient to carry the transmitter for successful transmission of the data.

Methods (300) and corresponding systems (100) for adapting a clear channel assessment (CCA) threshold in a node in a wireless network includes determining a first successful transmission rate of the node and neighboring nodes in the wireless network when the node is set to use a first CCA threshold. Next, a second successful transmission rate of the node and the neighboring nodes is determined when the node is set to use a second CCA threshold. Thereafter, one of the first and the second CCA thresholds is selected based upon the first and second successful transmission rates. The determining a successful transmission rate of the node and neighboring nodes can include counting successful packet indications transmitted by the node and received by the node from the neighboring nodes. Transmitted successful packet indications can include transmitted acknowledgement messages.

A system for monitoring a location to detect and report a vehicular incident, comprising a transducer for detecting acoustic waves at the location, and having an audio output; a processor for determining a probable occurrence or impending occurrence of a vehicular incident, based at least upon said audio output; an imaging system for capturing images of the location, and having an image output; a buffer, receiving said image output, and storing at least a portion of said images commencing at or before said determination; and a communication link, for selectively communicating said portion of said images stored in said buffer with a remote location and at least information identifying the location, wherein information stored in said buffer is preserved at least until an acknowledgement of receipt is received representing successful transmission through said communication link with the remote location.

A security system including a roam control unit, a plurality of sensors and a user interface device. The main control unit communicates with a remote central monitoring station, when a sensor detects an alarm event. Once the communication signal from the main control unit is successfully transmitted to the central station, a siren is sounded. Thus, the delay time to trigger the siren is dynamic based on the time it takes for successful transmission of an alarm notification to the central station. This dynamic delay accounts for transmission interruptions between the security system, and the central station and allows the location of the main unit and / or the siren from being detected prior to successful, alarm transmission, to the central station.

An RFID system includes transponders transmitting or receiving packetized data in standard form in lieu of custom format for applications executable in a mobile device or network. Tag data may be packetized in any of several standard formats. Each format includes a layer to identify packet format. In one embodiment, a tag contains a standard UDP header with a checksum and payload data. The application opens a socket to listen to UDP connections. The device transmits a RF signal activating tags which transmit UDP packets to a RFID reader in the device. The packets are passed to an IP stack which strips away the UDP header and validity of the checksum verified. If verified, the device transmits the payload to an application running in the device or a network, otherwise, the IP stack notifies the tag the transmission failed and requests re-transmissions which are repeated until a successful transmission occurs.

A method and apparatus for providing wireless data packet call regulation and call access for wireless Voice over Internet Protocol (VoIP) communications in a wireless network. A first and second time stamp is generated upon the reception and successful transmission of a data packet. A packet delay is determined based upon the first and second time stamps. At least one average delay metric is used to determine whether to provide new call access based on the at least one average delay metric. Another aspect of the present invention is to block a class of users based, in part, on the average sector delay for each user subscriber class. If the average sector delay is greater than that allowed for a class of users, users of that class are denied access. A delay quality of service (QoS) block metric is used to determine if an individual user should be force dropped.

Method for exploiting frequency diversity in a multi-carrier communications system to improve retransmission performance. A preferred embodiment comprises receiving the request for retransmission, formatting data for the retransmission, selecting a carrier from a plurality of carriers, and transmitting the retransmission on the selected carrier. The selected carrier may be different from a carrier used transmit the damaged transmission, thereby frequency diversity is exploited to change the probability of successful transmission in the retransmission. Alternatively, the retransmission may take place at a later time, to permit changes in the selected carrier to take place and obtain frequency diversity via the changed carrier.

Embodiments of the invention disclose a system and a method for determining a rank of a node in a multi-hop wireless network, wherein the network includes a gateway node, client nodes, and relay nodes, wherein a node p(i) is a default parent of the node i having a rank, and the network uses a directed acyclic graph (DAG) topology. The method comprises steps of transmitting at least one data packet from the node to the default parent node over a wireless link; counting a number of successful transmissions of most recent transmissions of data packets; determining an expected transmission time (ETX) for the wireless link based on the number of successful transmissions in the most recent transmissions; and assigning a rank R(i) to the node based on the rank of the parent node and the ETX.

A method and system for communicating header compression layer control messages. Header compression control messages are generated by a header compression layer and are sent through at least one link layer data packet by a link transport communications protocol layer to a remote receiver. The link transport communications protocol layer monitors receipt of link layer data packet acknowledgements that are received from the link transport communications protocol layer of the remote receiver for the at least one link layer data packet. The link transport communications protocol layer determines successful transmission of the header compression control message and provides, to the header compression layer, an indication of successful header compression control message transmission.

An identification system is provided for identifying a plurality of randomly aligned object-based transponders (18, 20, 22) passing through a predetermined reading volume. A reader (10) includes multiple transmitting and receiving antenna arrays (12, 14, 16) which are arranged sequentially to transmit interrogating and energizing fields (29) into the reading volume, with each energizing field having a different polarisation. Each transponder (12, 14, 16) is arranged to be powered by at least one of the interrogating and energizing fields, and includes a short term memory module (30) which is arranged to record the successful transmission or otherwise of the identification signal of the transponder (20) and to retain the record in the absence of a power supply to the transponder. The short term memory module has a retention time longer than any predicted interruption of power supply to the transponder via one of the energizing fields within the reading volume. The minimum memory retention time is typically the time period taken for the sequential transmission of all but one of the interrogating and energizing fields (29) during an interrogation cycle.

A universal remote control interacts with a user to assist in training to one or more appliances. If the appliance is activated by a rolling code activation signal, a sequence of different rolling code activation signals is transmitted until the user indicates a successful rolling code transmission. If the appliance is activated by a fixed code activation signal, a fixed code word is used to generate and transmit each of a sequence of different fixed code activation signals until the user indicates a successful fixed code transmission. In response to an activation input, an activation signal is generated and transmitted based on data stored following user indication of a successful transmission.

A universal remote control interacts with a user to assist in training to one or more appliances. If the appliance is activated by a rolling code activation signal, a sequence of different rolling code activation signals is transmitted until the user indicates a successful rolling code transmission. If the appliance is activated by a fixed code activation signal, a fixed code word is used to generate and transmit each of a sequence of different fixed code activation signals until the user indicates a successful fixed code transmission. In response to an activation input, an activation signal is generated and transmitted based on data stored following user indication of a successful transmission.

A data transmission system using a human body as a signal transmission path includes a transmitter and a receiver. The transmitter uses a pair of electrodes which are held in close proximity to the skin of the human body. The transmitter transmits data to the receiver through the signal transmission path partly extending through the human body when a user carrying the transmitter touches a touch electrode of the receiver. The electrodes are integrated into a garment worn by the user in such a manner that the electrodes are kept in a closely facing relation to the skin of the user, thereby establishing the electrical path extending through the human body. With the integration of the two electrodes into the garment, the user wearing the garment as an everyday clothes or uniform can be easy and convenient to carry the transmitter for successful transmission of the data.

A driver for an IEEE 802.11 wireless network node determines a metric for link quality between the node and a remote node. The nodes communicate using a handshake protocol in which the first node expects to receive an acknowledgement (ACK) of receipt of a data packet from the remote node. The driver provides a measure for: collision induced losses (pc) between the first and remote nodes; a slot being erroneously detected as busy when a successful transmission could have been made (pexp) between the first and remote nodes; and a probability of successful reception of a packet when a collision occurs (pplc) between the first and remote nodes. The measure is based on a number (A) of acknowledgements received from the remote node vis-à-vis a number (T) of packets transmitted to the remote node. The driver can adjust one of carrier sensitivity or node transmission power based on the measure.

The present invention is applicable to the field of computer technology, and provides a method and device for sending, receiving, and transmitting offline files. The offline file transmission method includes the following steps: the sender client sends the file to be sent to the server; the file After the sending is successful, the sending client sends a file receiving notification message to the receiving client; the receiving client receives the file receiving notification message, and receives the file sent by the sending client from the server. By adopting the file transmission method provided by the embodiment of the present invention, no matter whether the receiving client is online or not, the file transmission can be realized through the instant messaging software, which facilitates the communication and exchange of users.

The invention provides a wireless Mesh intelligent power grid routing mechanism NQA-LB with QoS perceiving and loading balancing. The mechanism comprises four steps: firstly differentiating intelligent power grid service flows with different QoS requirements through an EDCA mechanism, and calculating the frame error rate of different service flows according to the data packet collision rate of the EDCA mechanism; secondly, calculating data packet queuing delay with different priorities of the queue length of forwarding node cache and the successful transmission probability of data packets; then designing the routing metric of QoS perceiving and loading balancing by comprehensively considering the data frame error rate and queuing delay of different service flows, and selecting an optimal path with less load for the service flow with different QoS demands; finally dynamically adjusting the data packet priority on an MAC layer according to network total loading and loading conditions of all priority service flows. The mechanism can more accurately perceive the link quality of the MAC layer, guarantees the QoS demands of different service flows of a power grid, further increases the data packet delivery rate and average throughput capacity, and reduces the end-to-end delay of all service flows.

A preamble transmission method for a wireless communication system is provided for improving the probability of successful transmission and reducing unnecessary retransmission power consumption. The preamble transmission method of the present invention calculates an initial transmission power; transmits a preamble with the initial transmission power through a random access channel; if an acknowledgement is received in response to the preamble, starts transmission of data; and if no acknowledgement is received in response to the preamble—calculates a retransmission power, and retransmits the preamble with the retransmission power.

The present invention discloses an apparatus and method for adapting a transmission parameter in a transmitting node of a data communication system to the current link quality of a data communication channel. The adapted transmission parameter is selected by the transmitting node from a set of transmission parameters in dependence on a number of successful transmissions. The number of successful transmissions is compared in the transmitting node against one of a first threshold value corresponding to a first state of the transmitting node and a second threshold value corresponding to a second state of the transmitting node. The method comprises in the transmitting node the steps of (a) counting the number of successful transmissions; (b) selecting the adapted transmission parameter (b1) in response to the number of successful transmissions equaling or exceeding the first threshold value when the transmitting node is in the first state, and (b2) in response to the number of successful transmissions equaling or exceeding the second threshold value when the transmitting node is in the second state; and in dependence of the result of a following transmission, operating the transmitting node in one of the first state and the second state.

A data transmission method using automatic repeat request (ARQ) in a radio interface protocol system consisting of a plurality of layers is provided. The method includes delivering, from an upper layer to a lower layer, a data block stored in an ARQ buffer, the ARQ buffer storing a plurality of data blocks to be transmitted in response the lower layer, the data block; delivering, from the upper layer to the lower layer, a new data block stored in the ARQ buffer if a delivery success message is received from the lower layer, the delivery success message indicating successful transmission of the data block; and shifting a window of the ARQ buffer. The present invention can effectively use radio resources since an ARQ procedure does not require a polling process and a process of receiving a status PDU, and is suitable for high rate data transmission.

A method and apparatus for processing a Buffer Status Report (BSR) are disclosed in the disclosure. At least one of the following processing steps is performed when the BSR is transmitted using Contention Based (CB) uplink resources: A. restarting no retransmission BSR timer (retxBSR_Timer) when an uplink grant indicating CB uplink resources is received; B. restarting no retxBSR_Timer and / or no periodic BSR timer (PeriodicBSR_Timer) when the uplink resources are available; C. cancelling no triggered BSR when a BSR-related Media Access Control Protocol Data Unit (MAC PDU) is formed by occupying the uplink resources; and cancelling the triggered BSR when an indication for a successful transmission of the BSR-related MAC PDU is received; D. determining, according to a type of a triggered BSR, whether or not to cancel the triggered BSR, when a BSR-related MAC PDU is formed by occupying the uplink resources; and cancelling the triggered BSR when an indication for a successful transmission of the BSR-related MAC PDU is received. With the disclosure, the influence on User Equipment (UE) due to the failure of the BSR transmission when the BSR is transmitted by occupying the CB uplink transmission resources is decreased.

An access point station responds to a request from a user station for contention-based access of a new traffic flow to a wireless transmission medium by applying a model of the wireless local area network to estimate delay that data packets will experience when delivered through the wireless network, in order to admit the new flow upon determining that admission will not violate quality of service requirements of neither the new flow nor of already admitted flows. For example, the access point station applies the model by determining an average packet inter-arrival rate, solving a system of nonlinear equations to determine probabilities of successful transmission, applying network stability conditions, computing an upper bound on queuing delay for the packets, computing a service delay budget for the packets, and computing an expected fraction of missed packets from the service delay budget.

A method for managing data traffic in a multiple-user multiple simultaneous access environment using a channel load estimate and a calculation. The estimate or estimates are used to calculate a congestion threshold (CT) and to select a current congestion threshold broadcast to all potential users. An experiment is performed by users comparing that congestion threshold value and a random number to determine if a packet is eligible to be transmitted, thus throttling the random transmission of packets so that the transmitted load from the terminal has a rate of packet transmission that is less than the congestion threshold times the offered load (from the user), where the congestion threshold value is related to the probability of a globally successful transmission of a number of simultaneously transmitted packets. A quality of service (QOS) factor may also throttle the transmitted load.

Disclosed is a method and apparatus for improved self-healing in a mobile ad-hoc wireless network in which network communication functions are divided into a plurality of functional layers. The system utilizes cross-layer self-healing techniques. Network data from at least one of the functional layers is stored, for example in a storage unit of the network node. The stored network data is then used to modify the functioning of at least one of the other layers. In one embodiment, a management module manages the storage and use of the network data. In particular embodiments, the stored network data relates to successful transmission rates and / or clear channel rates, and this stored data is used to adjust the transmission power of the network node. In another embodiment, the stored data may be used to generate a table of interchangeable network nodes, which may then be used to reroute a data packet to a network node other than an originally specified destination node. In yet another embodiment, the stored data may be used to generate a list of recent neighbor nodes, which data may be used to reroute data packets to intermediate network nodes.