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899results about "Time-division multiplexing usage" patented technology
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Data communication systems and methods
ActiveUS8908573B1Facilitate data communicationAvoid interferenceError detection/prevention using signal quality detectorCriteria allocationCommunications systemBroadband transmission
The present invention provides systems and methods for improved data communication between communication terminals such as a base station and an unmanned aerial vehicle. In some instances, the systems and methods described herein provide robust transmission uplink data such as control data and wideband transmission of downlink data such as image data or other sensor data, while avoiding interference between the uplink data transmission and the downlink transmission.
Owner:SZ DJI TECH CO LTD
Uplink resource allocation to control intercell interference in a wireless communication system
ActiveUS20070042784A1Avoid elevationSuitable characteristicPower managementReceivers monitoringCommunications systemUplink transmission
Embodiments of the present invention exploit the reciprocity of radio channels in TDD, and longer-term correlation between average uplink and downlink path losses in FDD wireless communication systems to enable distributed schedulers in an enhanced uplink system to allocate uplink transmission resources while preemptively managing intercell interference levels. Each cell's base station transmits a downlink reference signal at a known transmission power level. A mobile station monitors the received signal strength of the downlink reference signals from multiple base stations. The transmitted and received signal strength levels can be used by the mobile station to estimate the amount of intercell interference that the mobile station's uplink transmissions cause, and the mobile station's uplink transmission parameters are adjusted accordingly. In further embodiments, the received reference signal power levels, or values derived therefrom, are transmitted by the mobile station to its serving base station, where a scheduling algorithm uses the information to adjust one or more transmission parameters relating to a grant of uplink transmission resources to the UE, thereby controlling the intercell interference generated by the mobile station's uplink transmissions.
Owner:SONY CORP
Communication device and communication method
InactiveUS20090227282A1Reduce the amount requiredShort timeServices signallingFrequency-division multiplexExecution controlCommunication control
A communication device has a first communication section that supports a first communication mode having a low communication rate and a second communication section that supports a second communication mode having a higher communication rate than the first communication mode. The communication device includes a packet generation section and a communication control section. The packet generation section generates a first portion containing authentication information used for connection authentication for the second communication mode and a second portion other than the first portion. The communication control section performs control to cause the first communication section to transmit the first portion and to cause the second communication section to transmit the second portion after the connection authentication succeeds using the authentication information contained in the first portion.
Owner:SONY CORP
Synchronization of timestamps to compensate for communication latency between devices
InactiveUS20050010691A1To overcome the large delayTime-division multiplexMultiple digital computer combinationsTimestampControl signal
Protocol analyzer systems enable synchronization of timestamps and the capture of data across serially chained boxes that are used together to monitor and capture network data. Through experiment, it can be determined how long it takes to propagate a signal to each box in the chain. These values are then recorded in each box in a delay register so that each box has a recorded delay value corresponding to the time required to propagate a signal to or receive a signal from every other box. Each box applies a control signal, such as a run signal or a trigger signal, to the ports in the box only after the expiration of the delay value indicated in the delay register. The box initiating the signal has the largest delay since the other boxes need to get the signal before the boxes can begin to operate with a common counter, with successive boxes having smaller delays.
Owner:VIAVI SOLUTIONS INC
System and method for data communication over power lines
InactiveUS7986711B2Improve data communication rateReduce distractionsDc network circuit arrangementsTransmission/receiving by adding signal to waveLow voltageTransformer
Owner:ACN ADVANCED COMM NETWORK
Point-to-multipoint microwave communication
InactiveUS20130077612A1Network topologiesWireless commuication servicesMicrowaveCommunications system
A microwave communication system may include subscriber stations in communication with a base station. The stations may include time duplex circuitry normally found in wireless local area networks (WLANs). Signals normally routed through antennas associated with such circuitry instead are routed through circuitry to perforin frequency conversion to and from microwave communications frequencies, for communications over microwave links between the subscriber stations and the base station. In some embodiments the wireless circuitry is configured for multiple input multiple output (MIMO) operation with one antenna port dedicated for transmission of data and one antenna port dedicated to reception of data.
Owner:SKYRIVER SPECTRUM & TECH LLC
Wireless presentation system
ActiveUS7434166B2Multiplex system selection arrangementsBuilt-on/built-in screen projectorsGraphicsTelecommunications
A system and method for interactive management of multiple wireless devices (such as PDA's or desktop or laptop computers) making graphical or video presentations while connected wirelessly to a display device whose wireless module converts the transmitted data from the wireless devices to the required format for display.
Owner:HARMAN INT IND INC
Architecture, protocols and frame formats for wireless multi-hop relay networks
InactiveUS20080080436A1Power managementNetwork traffic/resource managementTelecommunicationsMulti hop relay
Methods, protocols and systems for communicating in a multi-hop wireless mesh network may include explicitly providing information relating to backhaul wireless link qualities in multi-hop wireless mesh network to next generation subscriber stations in a first mode. In a second mode, embodiments are configured to implicitly provide indicia of multi-hop wireless link qualities to legacy subscriber stations by adjusting a transmit power of frames sent to the legacy subscriber stations. Other embodiments and variations are described in the detailed description.
Owner:INTEL CORP
Feedback reduction for MIMO precoded system by exploiting channel correlation
ActiveUS20080080459A1Special service provision for substationMultiplex system selection arrangementsPrecodingCommunications system
In a closed-loop wireless communication system, a codebook-based precoding feedback compression mechanism is provided to remove redundancy from the precoding feedback that is caused by channel correlation in time and frequency. Redundancy due to temporal correlation of the transmission channel is removed by sending precoding feedback only if there is a change in the precoder state for the channel to the receiver. Redundancy due to frequency correlation is removed by run length encoding the precoding feedback, thereby compressing the precoding feedback prior in the frequency domain. By compressing the precoding feedback, the average rate of precoder feedback is reduced.
Owner:NXP USA INC
Method and apparatus for transmitting and receiving signals in wireless communication system
ActiveUS20120155337A1Effective distributionEasy to usePower managementSignal allocationCommunications systemControl signal
An apparatus and a method for allocating resources for transmitting an HARQ ACK / NACK signal for a downlink subframe using a PUCCH format 3 in a time division duplex (TDD) system using a single carrier are provided. Since the resources are allocated through a resource indicator transmitted using a power control field transmitted on a PDCCH of the downlink subframe, the resources for transmitting the HARQ ACK / NACK signal may be allocated by effectively using resources allocated to a duplicately transferred control signal.
Owner:PANTECH CORP
Apparatus and method for enhanced UM RLC data handling
ActiveUS20050270996A1Minimize delivery delay timeAvoidingError prevention/detection by using return channelBroadcast transmission systemsDelayed timeData treatment
An unacknowledged mode (UM) radio link control (RLC) entity receives RLC protocol data units (PDUs) delivered through one or more logical channels and re-orders the received PDUs by referring to their sequence numbers and by using a receive window and a timer to minimize delivery delay time, to reduce missing PDUs received from each logical channel, and to process the PDUs by avoiding duplicate PDUs.
Owner:LG ELECTRONICS INC
Radio communication system, radio communication apparatus, radio communication method, and computer program
InactiveUS20050210157A1Avoid collisionAccurate operationFrequency-division multiplexData switching by path configurationCommunications systemCommunications media
In order to allow each of communication stations to execute impartial control of accesses to communication media by setting executable-communication ranges of their own independently of each other in a communication environment based on a CSMA method, the present invention provides a radio communication system in which each communication station is capable of checking the occupation state of communication media and setting such an executable-communication range of its own in accordance with the occupation state of the communication media that the number of communication stations coexisting in the executable-communication range is brought to a value within a predetermined range. For example, a specific communication station sets an executable-communication range of its own in order to limit the number of other communication stations capable of communicating with the specific communication station. In addition, a communication station sets an executable-transmission range suitable for an executable-reception range set by itself in order to reduce the degree of non-uniformity of the access control and to minimize the impact of interferences on other communication stations.
Owner:SONY CORP
Power Line Communication Device and Method
InactiveUS20070002772A1Error preventionFrequency-division multiplex detailsModem deviceTransmitted power
A power line communication device for communicating data signals over a power line is provided. One example embodiment comprises a conditioning circuit configured to be coupled to the power line and a modem communicatively coupled to the conditioning circuitry to transmit and receive data signals over the power line via the conditioning circuitry. The modem may be configured to transmit and receive orthogonal frequency division multiplexed data signals that comprise a plurality of sub-carriers, wherein the modem is adapted to vary the transmit power for each of a plurality of subsets of the plurality of sub-carriers from substantially zero power to a plurality of increments above zero power. The modem also may be adapted to transmit and receive data signals with the transmit power for each of a plurality of subsets of the plurality of sub-carriers being different and to transmit and receive using a different modulation scheme at different sub-carriers.
Owner:CURRENT TECH
Packet stream arrangement in multimedia transmission
InactiveUS20060109805A1Reduce delaysUnequal error protectionError preventionFrequency-division multiplex detailsTransmission orderMultimedia transmission
Transmitting media information from a transmitting device to a receiving device. To perform the transmission a media stream is encoded and packets are formed from the encoded media stream, the packets containing application data units, the application data units having a decoding order. At least two blocks are generated from the packets. The packets of the at least two blocks are organized into a first group and a second group, the first group being decodable without reception of said second group. The transmission order of the packets of said first group is arranged succeeding packets of said second group such that the application data units in the transmission order are at least partly in a different order than the decoding order.
Owner:NOKIA CORP
Method and an apparatus for determining the radio frame structure of time division duplex system
ActiveUS20100246456A1Improve interferenceFlexible supportSynchronisation arrangementTime-division multiplexEngineeringTime-division multiplexing
A method for determining the radio frame structure of a Time Division Duplex system is disclosed, which comprises: configuring, by the network side, the radio frame structure used for service transmission as containing two half-frames each of 5 ms, wherein each half-frame consists of eight service time slots of 0.5 ms and one special time slot field of 1 ms, two consecutive service time slots form a subframe of which the length is 1 ms, and the special time slot field contains a DwPTS, a GP and an UpPTS; determining the lengths of the DwPTS, the GP and the UpPTS in the special time slot field according to the requirements of the coverage range, and determining the radio frame structure used for service transmission. By reconfiguring the radio frame structure, the invention can flexibly support different coverage ranges, enhance the flexibility of satisfying different service requirements, and implement the coexistence of two types of TDD systems.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Method and apparatus for transmitting and receiving time division duplex frame configuration information in wireless communication system
ActiveUS20120320806A1Avoid receivingSolve precise controlError preventionTime-division multiplexCommunications systemControl channel
A method and an apparatus for transmitting and receiving Time Division Duplex (TDD) frame configuration information are disclosed. The base station transmits TDD frame configuration information as system information to a user equipment through a common control channel so as to dynamically change the TDD frame configuration according to uplink and downlink traffic conditions. The base station may deliver the same system information to all user equipments in the cell, removing ambiguity in User Equipment (UE) operations and avoiding interference. In comparison to an existing method of delivering TDD frame configuration information through system information update, the disclosed method enables user equipments to rapidly cope with traffic changes. In addition, user equipments may receive and apply TDD frame configuration information at the same time.
Owner:SAMSUNG ELECTRONICS CO LTD
Fibre channel switch that enables end devices in different fabrics to communicate with one another while retaining their unique fibre channel domain_IDs
An Fibre Channel Switch which enables end devices in different Fabrics to communicate with one another while retaining their unique Fibre Channel Domain_IDs. The Switch is coupled to a first fabric having a first set of end devices and a second fabric having a second set of end devices. The Switch is configured to enable communication by the first set of end devices associated with the first fabric with the second set of end devices associated with the second set of end devices using the unique Domain_IDs of each of the first set and the second set of end devices. In one embodiment of the invention, the first and second fabrics are first and second Virtual Storage Array Networks (VSANs) respectively. In an alternative embodiment, the first fabric and the second fabric are separate physical fabrics.
Owner:CISCO TECH INC
Network device architecture for consolidating input/output and reducing latency
ActiveUS20060087989A1Simplify connectivity issuesHigh bandwidthData switching networksTime-division multiplexing usageTraffic capacityHigh bandwidth
The present invention provides methods and devices for implementing a Low Latency Ethernet (“LLE”) solution, also referred to herein as a Data Center Ethernet (“DCE”) solution, which simplifies the connectivity of data centers and provides a high bandwidth, low latency network for carrying Ethernet and storage traffic. Some aspects of the invention involve transforming FC frames into a format suitable for transport on an Ethernet. Some preferred implementations of the invention implement multiple virtual lanes (“VLs”) in a single physical connection of a data center or similar network. Some VLs are “drop” VLs, with Ethernet-like behavior, and others are “no-drop” lanes with FC-like behavior. Some preferred implementations of the invention provide guaranteed bandwidth based on credits and VL. Active buffer management allows for both high reliability and low latency while using small frame buffers. Preferably, the rules for active buffer management are different for drop and no drop VLs.
Owner:CISCO TECH INC
Network protocol for wireless broadband-ISDN using ATM
InactiveUS6151312AInterference minimizationMinimum delaySynchronisation arrangementError preventionNetworking protocolIntegrated Services Digital Network
A network protocol for the delivery of wireless broadband integrated services digital network (ISDN) using asynchronous transfer mode (ATM).
Owner:ALCATEL USA SOURCING
High speed packet interface and method
A high speed multi-lane serial interface and method for constructing frames for such an interface are provided. Frames are constructed for transmission on a multi-lane serial interface. For each of a plurality of transmit channels, packets are fragmented into fragments. Meta-frames are generated having a size defined by a constant meta-frame length×number of lanes, each frame having a meta-frame separator and a payload. Per-transmit channel flow control information is received. Each payload has a plurality of bursts, each burst comprising a burst control word and an associated data burst, the burst control word identifying one of said transmit channels to be transmitted on the associated data burst, each data burst comprising one of the fragments for the transmit channel identified in the associated burst control word. The channels to transmit in a given meta-frame are selected as a function of the received flow control information.
Owner:REALTEK SINGAPORE PTE LTD +3
Configuring method, configuring system, apparatus, receiving method, receiving system, and terminal
ActiveCN104968052AEasy to detect and receiveAccurately detect and receiveSynchronisation arrangementCriteria allocationComputer terminalComputer science
The invention provides a reference signal configuring method and system, an apparatus with a base station function, a reference signal receiving method, a reference signal receiving system, and a terminal. The reference signal configuring method comprises: setting at least one discovery reference signal (DRS) in DMTC (DRS measurement timing configuration); configuring a sending parameter for the at least one DRS; and sending the sending parameter to a terminal served by the apparatus with a base station function in order that the terminal receives the at least one DRS according to the sending parameter. The reference signal configuring method may reduce DRS detection complexity for UE while increasing DRS sending probability in order to enable the terminal to accurately receive the DRS and achieve frame synchronization and subframe synchronization.
Owner:YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD
System and method for transmitting/receiving automatic repeat request
InactiveUS20050152350A1Easy constructionPrecise functionMultiplex system selection arrangementsError prevention/detection by using return channelComputer hardwareHigh rate
Disclosed are a system and method for transmitting / receiving an ARQ for correcting errors in an OFDM / TDMA terminal, and generating high-rate frames. The ARQ transmitting / receiving system of an OFDM / TDMA terminal comprises a CPU transmitting / receiving a data packet to / from an upper block in a software manner; an ARQ transmitting / receiving unit receiving the data packet, dividing the data packet into fragments each having a predetermined size, storing the fragments, generating a frame at the moment of generating a frame based on the stored fragment information, checking whether ARQ is retried or not, and transmitting / receiving the ARQ in a hardware manner; an interface buffer storing data transmitted between the CPU and the ARQ transmitting / receiving unit; and a fragment buffer storing fragments generated by the ARQ transmitting / receiving unit.
Owner:ELECTRONICS & TELECOMM RES INST +4
Method and apparatus for data transfer using a time division multiple frequency scheme supplemented with polarity modulation
A method of data transmission according to one embodiment of the invention includes encoding a set of data values to produce a corresponding series of ordered n-tuples. The method also includes transmitting, according to the series of ordered n-tuples, a plurality of bursts over a plurality n of frequency bands. Specifically, for each of the plurality of bursts, a frequency band occupied by the burst is indicated by the order within its n-tuple of an element corresponding to the burst. A bandwidth of at least one of the plurality of bursts is at least two percent of the center frequency of the burst. Information is encoded into a polarity of at least one of the plurality of bursts.
Owner:GENERAL ATOMICS
High availability narrowband channel for bandwidth efficient modulation applications
InactiveUS20060285607A1Improve usabilityReliable resolutionMultiple modulation transmitter/receiver arrangementsAmplitude demodulation by homodyne/synchrodyne circuitsCommunications systemData stream
A communication system includes a transmitter that transmits both wideband data and narrowband data on a link and a receiver that receives the wideband data and the narrowband data on the link. The receiver demultiplexes the wideband data and the narrowband data into separate data streams so that the link effects transmission of a narrowband channel and a wideband channel. The system achieves high link availability on a link using bandwidth efficient modulation by using a more robust modulation format for the narrowband channel to enable higher link availability for the narrowband channel (carrying the narrowband data on the link) than for the wideband channel. The link may employ bandwidth efficient modulation or may be compatible with prior art wideband modulation formats.
Owner:THE BOEING CO
Resource allocation in a communication system supporting application flows having quality of service requirements
InactiveUS7406098B2Network traffic/resource managementTime-division multiplexQuality of serviceCommunications system
A method and apparatus for allocating and using a resource to transmit wireless information signals to a plurality of subscriber units wherein application flows are selected based on associated Quality of Service (QoS) requirements. Compensation factors are evaluated for a plurality of QoS requirements. For a violation of a given QoS requirement, the corresponding compensation factor is calculated and applied to an adaptive weight, else the compensation factor is set to a default value.
Owner:QUALCOMM INC
Apparatus and method for defining physical channel transmit/receive timings and resource allocation in TDD communication system supporting carrier aggregation
A method of defining physical channel transmit / receiving timings and resource allocation is provided for use in a Time Division Duplex (TDD) communication system supporting carrier aggregation. A method for receiving, at a base station, a Hybrid Automatic Repeat Request (HARQ) acknowledgement from a terminal in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell includes transmitting a downlink physical channel through one of the primary and secondary cells, receiving the HARQ acknowledgement corresponding to the downlink physical channel of the primary cell at a first timing predetermined for the primary cell, and receiving the HARQ acknowledgement corresponding to the downlink physical channel of the secondary cell at second timing, wherein the second timing is determined according to the first timing.
Owner:SAMSUNG ELECTRONICS CO LTD
Method of a signal transmission for controlling a quantity of data transmitted and a signal transmission apparatus therefor
InactiveUS7729255B2Reduce data volumeTelevision system detailsPulse modulation television signal transmissionCamera controlControl signal
Owner:KOKUSA ELECTRIC CO LTD
Cellular communication system and method for coexistence of dissimilar systems
ActiveUS20070081489A1Simple and efficient mechanismAvoid disturbing influenceTime-division multiplexRadio/inductive link selection arrangementsTelecommunicationsCommunication unit
A cellular communication system comprises first and second serving communication units supporting respective first and second time division duplex (TDD) modes of operation on respective first and substantially frequency-adjacent second frequency channels comprising a plurality of uplink transmission resources divided into uplink timeslots and a plurality of downlink transmission resources divided into downlink timeslots. The first and second modes of TDD operation are dissimilar and communications cover substantially the same or overlapping geographic area. The first serving communication unit transmits a plurality of idle periods in the first mode of operation arranged to encompass a time period used by the second serving communication unit for switching communication between downlink and uplink transmissions of the second mode of operation.
Owner:SISVEL INT
Transfer of messages in a multiplexed system
A method and apparatus for transmitting variable length messages on a network in fixed length slots including the provision of a source identifier field in the header of each slot, the source identifier field including a code which is uniquely associated with the message to be transmitted. The fixed length slots are then transmitted on the network and reassembly of the slots by a reassembly machine is controlled in accordance with the identifier codes in the slot.
Owner:QPSX COMM
Rendezvousing resource requests with corresponding resources
ActiveUS20060087990A1Data switching by path configurationTime-division multiplexing usageRouting tableProximal point
The present invention extends to methods, systems, and computer program products for rendezvousing resource requests with corresponding resources. Doubly linked sorted lists are traversed using modulo arithmetic in both directions. Sorted lists can be partitioned based on a multiple proximity metrics. Node routing tables provide a logarithmic index to nodes within the ID space of the federation infrastructure to facilitate more efficient routing. Messages can be routed to nodes within a ring and proximally routed to nodes in other partitioned rings.
Owner:MICROSOFT TECH LICENSING LLC
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