| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 370445000 | Carrier sense multiple access (CSMA) | 84 |
| 20080205429 | Channel assignments in carrier sense wireless networks - In a method for assigning transmission channels to links based on link-directionality in carrier sense wireless networks. The transmissions between two nodes of a link can be split into two channels based on their link-directionalities, one channel for transmitting traffic in one direction while the other channel for sending traffic in another direction. Simultaneous transmissions of a nearby node can be assigned based on link-directionality with a different transmission channel if it is within the carrier sensing region of the link or the same transmission channel if it is far enough from the link, which does not affect the reception of the link. | 08-28-2008 |
| 20080205430 | BANDWIDTH CONTROL APPARATUS, BANDWIDTH CONTROL SYSTEM, AND BANDWIDTH CONTROL METHOD - The present invention provides a bandwidth control system capable of controlling the transmission of data frames using a control frame including bandwidth information. A reception-side communication apparatus | 08-28-2008 |
| 20080219285 | Multi-Channel Communications Protocol - There is a need to improve design of communications protocols in which two or more channels are provided and, optionally, in which collision avoidance is not available. An improved protocol is provided in which communications nodes pick a channel on which to transmit and collisions may occur where two nodes attempt to transmit on the same channel. The node currently occupying a channel is arranged to have a specified probability of holding onto that channel as compared to a newcomer. Other methods are described whereby a node is able to occupy more than one channel at the same time and whereby nodes each occupy approximately the same number of channels. | 09-11-2008 |
| 20080219286 | METHOD AND SYSTEM FOR CONTENTION RESOLUTION IN TELECOMMUNICATION NETWORKS - A method and system for contention resolution in a communications network are disclosed. As one example, a method for contention resolution in a communications network is disclosed. The method includes the steps of transmitting a first contention message during a first time interval, determining if a second contention message has been received during the first time interval, if the second contention message has been received during the first time interval, deferring a use of a network resource in the communications network, and if the second contention message has not been received during the first time interval, using the network resource during a second time interval. | 09-11-2008 |
| 20080225879 | METHOD AND SYSTEM FOR REDUCING TRANSCEIVER POWER VIA A VARIABLE SYMBOL RATE - Aspects of a method and system for reducing transceiver power via a variable symbol rate are provided. In this regard, an Ethernet transmitter may be enabled to transmit data at a variable symbol rate, wherein the symbol rate is determined based on a state of a link coupled to said Ethernet transmitter and/or resources available to said Ethernet transmitter. In this regard, link state may comprise one or more of, for example, available bandwidth, bit error rate, packet error rate, and link utilization; and resources may comprise one or more of, for example, power, buffer space, and processor time. Accordingly one or more threshold for link state and/or resources may be determined and the symbol rate may be adjusted when those thresholds are exceeded. Aspects of the invention may enable defining and/or transmitting unique symbols to identify possible symbol rates and/or a change in symbol rate. | 09-18-2008 |
| 20080240143 | COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, AND COMMUNICATION CONTROL METHOD - A communication apparatus which performs a carrier detection and is connected to a transmission line includes: a carrier detecting unit which detects a first control signal for the carrier detection and a second control signal for the carrier detection; a comparing unit which compares carrier detecting results obtained by the carrier detecting unit; and a control unit which controls at least one of a symbol length of the first control signal and a symbol length of the second control signal based upon a comparison result obtained by the comparing unit. | 10-02-2008 |
| 20080279209 | Time-space carrier sense multiple access - A scalable switch, a system of switches and methods, configured to sense a carrier at the output of the respective switch. The invention intelligently, and dynamically, controls the connection of a respective switch input to a respective switch output as a function of a carrier being present, or absent, at a selected output. The present invention provides a switching system that is scalable, and not limited as are Stored Program Control (SPC) type switches. | 11-13-2008 |
| 20080298384 | Ruggedized Analog Front-End for a Network Communicative Device in a Railway-Like Environment - A ruggedized analog front-end for interconnecting a network communicative device to a two-conductor based network operable in a train-like or other harsh environment. The front-end has a coupling circuit having first and second coupling channels providing isolation, impedance matching and energy transfer between a common mode filter circuit connectable to the two-conductor based network, and an amplifier and an attenuator respectively connectable to output and input of the network communicative device. The front-end has a power supply circuit for operative power supply of electronic components of the analog front-end. | 12-04-2008 |
| 20080298385 | DEVICE AND METHOD OF SUPPLYING POWER TO TARGETS ON SINGLE-WIRE INTERFACE - A single-wire interface communication system is capable of providing both electrical communication of signals and power between devices coupled to the system. Coupled to the single-wire interface is at least one target device which contains a PMOS transistor, a charge storage device, an inverter controlling the PMOS transistor, and a target device function. The charge storage device provides power to the target device function and to the inverter. The PMOS transistor receives power from the single-wire interface at a power-supply voltage level and charges the charge storage device to the same level. Non-communication periods produce a charging period sufficient for the charge storage device to attain the power-supply voltage level. | 12-04-2008 |
| 20090003373 | Method and apparatus for receiving power over a data network - A method, apparatus, and computer usable program product for receiving power over Ethernet in a redundant transceiver are provided in the illustrative embodiments. A determination is made in a redundant transceiver if electrical power is available over Ethernet. If power over Ethernet is available, power is received over Ethernet in the redundant transceiver, otherwise the redundant transceiver receives power from an attached power supply. For receiving power over Ethernet, the redundant transceiver remains in communication with the source of power over Ethernet using a wired section of the Ethernet, and the redundant transceiver receives electrical power to operate using the wired section of the Ethernet. The redundant transceiver receives power over Ethernet using a wire that is simultaneously carrying a data signal. When data signal and power are provided on a common wire, the redundant transceiver separates the electrical power from the data signal, uses the electrical power for operating the redundant transceiver, and uses the data signal for performing a function of the redundant transceiver. | 01-01-2009 |
| 20090010275 | MEDIUM RESERVATION WITH CHANNEL SELECTIVITY - A medium-reservation mechanism improves transmission efficiency in a multiple-channel network that includes stations with limited-selectivity receivers. The mechanism employs a medium-request signal that conveys channel information. In this network, stations check the channel information in the medium-request signal to decide whether or not to comply with the medium-request signal. If the channel information identifies the channel that is close to the channel that the station is presently operating on, the station then complies with the medium-request signal. If the channel information identifies a channel other than the channel that the station is presently operating on, the station ignores the medium-request signal. | 01-08-2009 |
| 20090059948 | Low Current Method For Detecting Presence of Ethernet Signals - A signal detection circuit for an Ethernet physical layer transceiver (PHY) device includes a first capacitor AC coupling a signal on the first receive terminal of the Ethernet PHY device to a first node; a second capacitor AC coupling a signal on the second receive terminal to a second node; re-biasing resistors for re-biasing the AC-coupled signals on the first and second nodes; first and second gain stages for amplifying the AC coupled signals; and a peak detect circuit. The peak detect circuit includes first and second diodes receiving the amplified signals from the gain stages to charge a peak detect capacitor. The signal detection circuit includes a comparator for comparing the voltage on the peak detect capacitor to a reference voltage and providing an output signal being indicative of the presence or absence of a signal on the first and second receive terminals of the Ethernet PHY device. | 03-05-2009 |
| 20090080454 | Signal Generating Apparatus and Signal Generation Method - A signal generating apparatus, which is adapted for outputting a multicarrier signal where data are multiplexed with respect to a plurality of subcarriers, includes: a rotation sequence selection signal generator for generating a plurality of rotation sequence selection signal sequences which vary the phase relationship between subcarriers on the basis of a plurality of phase rotation sequences and include the number of samples, which are smaller than that of actual transmission signals; and a minimum peak power signal generator for selecting a signal of which peak power becomes minimum from the plurality of rotation sequence selection signals to generate an actual transmission signal by using a phase rotation sequence multiplied with respect to the selected signal. | 03-26-2009 |
| 20090080455 | SYSTEMS AND METHODS FOR REDUCING DATA COLLISIONS IN WIRELESS NETWORK COMMUNICATIONS - The present disclosure generally relates to systems and methods for reducing data collisions in wireless networks. In one exemplary embodiment of the present disclosure, a node of a wireless network monitors traffic from at least one foreign network. The node attempts to identify patterns of communication in the foreign network. Based on an identified pattern, the node schedules a transmission during time period for which it is likely that the foreign network is not attempting a transmission that would otherwise interfere with the node's signal. Accordingly, the probability of a data collision is reduced. | 03-26-2009 |
| 20090109990 | COOPERATIVE CSMA MODE IDENTIFICATION IN CLUSTERED NETWORKS - In one embodiment, a sensing device ( | 04-30-2009 |
| 20090109991 | NULL INDICATION IN A SHARED ROBUST SCHEME - A method implemented on a network node includes receiving an adjustable schedule of transmission start slots, the slots representing opportunities for initiating data transmission by at least one network device on a network, transmitting an expected duration indication in each slot associated with the network node as per the schedule, and adjusting the schedule in accordance with the expected duration for each transmission. A method for virtual carrier sensing includes receiving a schedule of transmission start slots on a network node, the slots representing opportunities initiating data transmission by at least one network device in a network, listening for transmissions by other network nodes according to the schedule, the transmissions indicating an expected length of a current transmission, adjusting the schedule in accordance with the indicating of a data transmission, and ignoring any subsequent transmissions until a next scheduled transmission start slot in accordance with the adjusted schedule. | 04-30-2009 |
| 20090109992 | CONTENTION SLOTS IN A SHARED ROBUST SCHEME - A method includes receiving a schedule of transmission start slots on a network node, the slots representing reserved and/or nonreserved opportunities for initiating data transmission by at least one network device in a network, the reserved opportunities associated with specific network devices, and the non-reserved opportunities available for non-reserved use by any network device on the network, and adjusting the schedule in accordance with successful transmissions by other network nodes. Another method includes generating a schedule of transmission start slots on a master node, where the slots represent reserved and/or nonreserved transmission initiation opportunities for the initiation of data transmission by at least one of a plurality of network devices in a network, the reserved opportunities being associated with specific network nodes, and the nonreserved opportunities being available for nonreserved use by any the network devices on the network, and distributing the schedule to the network devices. | 04-30-2009 |
| 20090154486 | Tracking Network Contention - Methods, apparatus, and product for tracking network contention on links among compute nodes of an operational group in a point-to-point data communications network of a parallel computer are disclosed. In embodiments of the present invention, each compute node is connected to an adjacent compute node in the point-to-point data communications network through a link. Tracking network contention according to embodiments of the present invention includes maintaining, by a network contention module on each compute node in the operational group, a local contention counter for each compute node, each local contention counter representing network contention on links among the compute nodes originating from the compute node; and maintaining a global contention counter, the global contention counter representing network contention currently on all links among the compute nodes in the operational group. | 06-18-2009 |
| 20090154487 | MANAGING COMMUNICATIONS OVER A SHARED MEDIUM - Communicating between stations over a shared medium includes: monitoring the shared medium for signals received at a first station that is identified with a local network; storing information at the first station that represents characteristics of the signals received at the first station associated with capacity of the shared medium; monitoring the shared medium for signals received at a second station that is identified with the same local network as the first station; storing information at the second station that represents characteristics of the signals received at the second station associated with capacity of the shared medium; and determining whether a stream of data is allowed to be transmitted over the shared medium between the first station and the second station based on at least one of the stored information from the first station and the stored information from the second station. | 06-18-2009 |
| 20090245273 | FRAME TRANSMISSION DEVICE AND CONTROL METHOD FOR THE SAME - A problem is solved in that a transmission path is continually used even if multiple collisions occur in the frame transmission device. An Ethernet transmission device | 10-01-2009 |
| 20090245274 | Apparatus and method for auto-negotiation in a communication system - A communication system includes a first device and a second device that can advertise multiple capabilities using communication links. A first type of auto-negotiation between the first and second devices is performed using a first communication link between the devices. A second communication link between the devices is used to facilitate a second type of auto-negotiation. For example, the first communication link can include pairs A and B of an IEEE Std. 802.3 four twisted pair cable. The second communication link can include pairs C and D of the cable. | 10-01-2009 |
| 20090252178 | Method, apparatus and computer program for self-adjusting spectrum sensing for cognitive radio - A cognitive radio determines a frequency channel of a spectrum, determines from a locally stored association of individual channels to either of at least two categories (e.g., in use and backup, other is a third category) a selected category for the determined frequency channel. From the selected category is determined a time at which to sense the determined frequency channel. The determined frequency channel is then sensed at the determined time and results of the sensing may be transmitted. Timers may be associated with each of the categories and adjusted based on density of cognitive nodes. A timer for the in use category is shortest, a timer for the other category is longest, and a timer for the backup category is between shortest and longest. | 10-08-2009 |
| 20090274167 | COMMUNICATION TERMINAL APPARATUS AND TRANSMITTING METHOD - A communication terminal apparatus capable of suppressing communication delay independently of the packet size, efficiently performing communication, and further solving the problem of hidden terminals. In this apparatus, a number-of-STAs holding part ( | 11-05-2009 |
| 20090279566 | METHOD AND SYSTEM FOR REDUCING CALL SET UP TIME IN A GROUP CALL - A method and system for communicating over an access channel in a network are disclosed. The method includes receiving a request at the network device ( | 11-12-2009 |
| 20090296730 | Intermittently operable communication apparatus with different carrier sense levels switched between transmission and reception and method therefor - The communication apparatus intermittently carries out receiving operation during a predetermined reception period. The apparatus includes a wireless communication section for carrying out wireless communication, which includes a carrier sensor for sensing a carrier at the beginning of the communication, and a carrier sense switching section for using carrier sense levels different between packet transmission and reception to switch the carrier sense level of the carrier sensor according to the packet. Thus, the apparatus can use and flexibly adjust the optimum carrier sense level for the intermittent receiving operation within the reception period. | 12-03-2009 |
| 20100027558 | HYBRID IMPLICIT TOKEN CARRIER SENSING MULTIPLE ACCESS/COLLISION AVOIDANCE PROTOCOL - Provided is a distributed and asynchronous implicit token carrier sense multiple access/collision avoidance (CSMA/CA) protocol guaranteeing quality of service for both real time and non-real time traffic. The implicit token CSMA/CA protocol allocates a band in an entire bandwidth to voice traffic and allows the remaining bands to be used for data traffic. The implicit token CSMA/CA protocol includes applying a token passing protocol to transmit voice traffic in real time by having a band in an entire bandwidth allocated using a predetermined data frame and applying a CSMA/CA mechanism to transmit data traffic in non-real time by employing remaining bands not allocated to the voice traffic using another predetermined data frame. | 02-04-2010 |
| 20100034214 | Access point device, communication device and method for access to communication media - The present invention provides an access point device, a communication unit and a method for access to a communication media in a communication network. The access point comprises a communication interface for exchanging data with a plurality of communication units in the communication network via the communication media; and a processor for receiving a media access request message in a contention mode from at least one communication unit of the plurality of communication units via the communication interface; and polling the at least one communication unit by assigning a media access duration to each of the at least one communication unit according to a corresponding duration information for media access in the received media access request message. | 02-11-2010 |
| 20100046540 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU. | 02-25-2010 |
| 20100091789 | COGNITIVE RADIO COMMUNICATION TERMINAL AND METHOD FOR DETECTING COLLISION USING FEATURE DETECTION - A cognitive radio communication terminal including a transmission processing unit to divide data by a quiet time slot that is allocated at a first point in time of a collision detection period, to transmit at least one portion of the divided data to a reception side, and a sensing unit to determine whether at least one of a feature information and an energy of another terminal is detected in a channel with the reception side during the quiet time slot of the first point in time. Where neither the feature information nor the energy of the other terminal is detected based on a determination of the sensing unit, the transmission processing unit transmits the remaining divided data. | 04-15-2010 |
| 20100111098 | Low power telemetry system and method - A telemetry system is described in which a plurality of channels are coupled to a bus. A control subsystem controls the channels so that one of the channels presents to the bus during its designated time period a channel characteristic. The control subsystem interrogates in the analog domain each of the channels during its designated time period, and forms a signal representative of the channel characteristic. The control subsystem may combine one or more of the signals into a digital packet, and transmit the same via transceiver over a wireless network. The channels may be contained within a submersible enclosure and displaced at intervals along the bus, thereby forming an array for monitoring waterborne threats. The array may lie along an ocean floor, may be towed by a marine vehicle, or may suspended from a deployable buoy containing the control subsystem, transceiver, and a remote power source. The array may further comprise a defensive countermeasure deployable responsive to detecting a threat. | 05-06-2010 |
| 20100128738 | INTERIM PHY SOLUTION FOR LPI COMPATIBILITY WITH LEGACY DEVICES - In one embodiment, a modified local PHY is adapted to couple a legacy host device to link partner implementing Energy Efficient Ethernet. The modified local PHY includes a buffer and if the legacy host transmits data when the modified local PHY is in a Low Power Idle (LPI) state then the data is stored in the buffer and transmission is paused until the modified local PHY transitions from the LPI state to an active state. | 05-27-2010 |
| 20100135318 | Enhanced power saving methods and systems for powerline network - Enhanced power saving methods and systems for a powerline network improve power conservation by adaptively regulating the monitoring of a shared carrier sense multiple access (CSMA) region of a beacon period based on current need. The methods and systems include one or more enhanced power saving modes (EPSM). In some embodiments, EPSM include one or both of an enhanced priority resolution (EPR) mode and an enhanced idle sensing (EIS) mode. In some embodiments, an EPSM is selected from a plurality of EPSM in response to an EPSM indicator detected in a beacon region of the beacon period. | 06-03-2010 |
| 20100135319 | METHOD AND APPARATUS FOR MEDIA ACCESS IN CONTENTION-BASED NETWORKS - A method and apparatus are described for gaining access to a communication medium in a contention-based network, including determining a slot count based on a number of stations in the contention-based network, adjusting the slot count, initiating a frame transmission when the slot count reaches a predetermined value and wherein said number of stations and an address queue are adjusted to reflect one of a priority and traffic patterns. Further, a method and apparatus are described for gaining access to a communication medium in a contention-based network, including receiving a slot count based on a number of stations in the contention-based network, adjusting the slot count, initiating a frame transmission when the slot count reaches a predetermined value and wherein said number of stations and an address queue are adjusted to reflect a priority. | 06-03-2010 |
| 20100158037 | DETERMINISTIC COMMUNICATION SYSTEM - The invention relates to a communication system and a method for controlling a communication system for communicating audio data between each of a plurality of terminal units (T | 06-24-2010 |
| 20100158038 | COMMUNICATION METHOD, COMMUNICATION APPARATUS, AND COMMUNICATION SYSTEM - A communication apparatus communicates with another communication apparatus connected to a transmission channel and sharing a communication band. The communication apparatus includes: a receiving unit that receives, through the transmission channel, data including time information based on a transmission time when a synchronous signal is transmitted to the transmission channel from a synchronous signal transmitting apparatus at a given cycle, the synchronous signal for synchronizing a plurality of communication apparatuses; a transmitting unit that transmits data to the transmission channel; and a transmission control unit that estimates a synchronous signal non-existing period in which there is no synchronous signal on the transmission channel on the basis of the time information received by the receiving unit and the given cycle, and controls the transmitting unit to transmit data within the estimated synchronous signal non-existing period. | 06-24-2010 |
| 20100172369 | COMMUNICATION METHOD AND COMMUNICATION APPARATUS - A communication method of communicating among a plurality of communication apparatuses connected to a transmission channel and sharing a communication band is provided. The communication method includes: sequentially updating a slot ID with the lapse of time by a first communication apparatus; transmitting first data and a first access ID to the transmission channel by the first communication apparatus after the lapse of a first waiting time and when the slot ID is updated to a first slot ID corresponding to the first access ID; transmitting second data and a second slot ID to the transmission channel by a second communication apparatus after the lapse of a second waiting time longer than the first waiting time; and receiving the second slot ID by the first communication apparatus. In updating the slot ID, the slot ID is updated to a slot ID subsequent to the second slot ID. | 07-08-2010 |
| 20100189126 | CURRENT POSITION TRANSMISSION IN A SHARED ROBUST SCHEME - A method implemented on a network node includes receiving an adjustable schedule of transmission start slots, where the transmission start slots represent transmission initiation opportunities for the initiation of data transmission by at least one of a plurality of network devices on a network, and transmitting a current position of the node within all groups of the schedule suitable for full resynchronization to the adjustable schedule by at least one other the network node. | 07-29-2010 |
| 20100195664 | Smart Adjustment of Backoff Counter and Contention Window for Improved Random Access - A method and system for random access control is disclosed. A backoff counter is used to determine the start time of a contended allocation for a device. The backoff counter is set to an integer randomly drawn from the interval [1, CW], where CW is a contention window value selected based upon the priority of the traffic to be transmitted. The backoff counter is decremented for each idle contention slot detected. When the backoff counter reaches zero, the device attempts to transmit in the next contention slot. If the device receives no acknowledgement or an incorrect acknowledgment, then the transmission has failed. After a failed transmission, CW is set by alternately doubling the CW value up to a CWmax value for the user priority. CW is unchanged, if it was doubled in the last setting; and CW is doubled, if it was unchanged in the last setting. | 08-05-2010 |
| 20100232452 | COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM - A physical frame is constructed, the physical frame including a medium access control super-frame payload which in turn includes a plurality of medium access control frames. With respect to the constructed physical frame, virtual carrier sense information is set in the plurality of medium access control frame so that a result of carrier sense is identical to another by virtual carrier sense based on the plurality of medium access control frames in the medium access control super-frame payload. The physical frame in which the virtual carrier sense information has been set is transmitted to a destined communication apparatus. | 09-16-2010 |
| 20100254403 | METHOD AND APPARATUS FOR COLLISION AVOIDANCE - A wireless communication device, a wireless communication system and a method of avoiding collisions by transmitting a packet length field before transmitting a header of the packet. | 10-07-2010 |
| 20110026543 | MOBILE COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM - A mobile communication apparatus includes a storage unit that stores therein correspondence information correlating area and transmission resource; an area deducing unit that deduces in which area the mobile communication apparatus is located; a selecting unit that selects the transmission resource correlated, in the correlation information stored by the storage unit, with the area deduced by the area deducing unit; and a transmitter that using the transmission resource selected by the selecting unit, transmits data to a second mobile communication apparatus. | 02-03-2011 |
| 20110038383 | A TECHNIQUE FOR TRANSMISSION BY A NODE OF A COMMUNICATIONS NETWORK - A transmission method is used by a node of a communications network, wherein nodes communicate with one another via a carrier-sense multiple-access channel, said method comprising a step of sending a signal at a given transmit power and a given data rate to a receiver node over the channel, and wherein the transmit power of the sent signal assumes successively a first power value during a first time period and then a second power value during a second time period, the two power values being different and one of them being equal to the given power, the first time period representing the given power and the second time period representing the data rate. The invention also relates to a method of receiving a signal sent by the transmission method enabling the transmit power and the data rate used by the sender node to be deduced from the received signal. | 02-17-2011 |
| 20110206060 | MASTER STATION OF COMMUNICATION SYSTEM AND ACCESS CONTROL METHOD - A communication bandwidth is divided into a beacon period in which all master stations compete for transmission of a beacon packet, a first carrier sense multiple access (CSMA) period in which only authorized specific stations are allowed to compete for access, and a second CSMA period in which all stations are allowed to compete for access. The master stations exchange information with each other about a communication bandwidth being used in the first CSMA period, thereby calculating a communication bandwidth which can be used by each communication system in the first CSMA period, based on the information. | 08-25-2011 |
| 20120155487 | Carrier Sense Multiple Access (CSMA) Protocols for Power Line Communications (PLC) - Systems and methods for carrier sense multiple access (CSMA) protocols for power line communications (PLC) are described. In some embodiments, a method may include performing a virtual carrier sensing operation and, in response to the virtual carrier sensing operation indicating that a communication channel is idle, calculating a contention window. The method may also include performing a physical carrier sensing operation subsequent to the virtual carrier sensing operation, the physical carrier sensing operation based, at least in part, upon the contention window. In response to the physical carrier sensing operation indicating that the communication channel is idle, the method may then include transmitting data over the channel. In other embodiments, another method may include determining that a data transmission is a unicast transmission and that an acknowledgement message has not been received. The method may further include incrementing a backoff parameter and repeating one or more carrier sense operations. | 06-21-2012 |
| 20120230349 | COMMUNICATION METHOD AND COMMUNICATION DEVICE AS WELL AS COMPUTER PROGRAM - Communication performed within a network including a plurality of communication stations is provided, in which when an access control is performed so that communication timing of a packet can not collide with that of another station by detecting a signal which is transmitted from another station, “a header area processed not to become easily an error such as a physical layer header portion of a packet” which is transmitted from a communication station is made to have at least information which is required for extracting information in a payload of the packet and a field for controlling an access reservation of transmission of a packet which is generated as a result of transmission of another packet so that processing using the field can be performed. | 09-13-2012 |
| 20120281712 | TRANSMITTING-RECEIVING APPARATUSES AND METHODS FOR TRANSMITTING AND RECEIVING DATA - A transmitting-receiving apparatus for a communication system for a vehicle is provided. The communication system also comprises a second transmitting-receiving apparatus. The apparatuses are connected via a bus. Messages from the transmitting-receiving apparatus to the second transmitting-receiving apparatus are transmitted by frames. Each frame comprises a first part. During the transmission of the first part, the one or both apparatuses determine whether there is a collision on the bus. Each frame also comprises a second part for transmitting useful data. The transmitting-receiving apparatus is adapted to transmit the first part of the frame via the bus at a first transmission frequency and the second part of the frame at a second transmission frequency. The second transmission frequency is higher than the first transmission frequency. | 11-08-2012 |
| 20120281713 | COMMUNICATION SYSTEM AND CORRESPONDING INTEGRATED CIRCUIT AND METHOD - A communication system transmits data from a first circuit over a communication channel to a second circuit, the data having a first priority and a second priority. The communication system includes a separation circuit, a first-in first-out (FIFO) memory, and a control circuit. | 11-08-2012 |
| 20120320931 | DYNAMIC SELECTION OF MAC INTERFRAME PARAMETERS IN PLC NETWORKS - A method of powerline communications (PLC) in a PLC network having a plurality of nodes including a first node and a second node. A first node receives a PLC signal from the second node. The first node decodes a media access control (MAC) frame of the PLC signal to determine a frame size of the MAC frame. Based on the frame size, dynamic selection of a Response Inter-Frame Space (RIFS) value from at least two candidate RIFS values and a Contention Inter-frame Space (CIFS) value from at least two candidate CIFS values is provided. | 12-20-2012 |
| 20130114622 | BLOCK ACKNOWLEDGEMENT FOR WIRELESS COMMUNICATION METHODS, APPARATUSES AND SYSTEMS - Systems and methods for reducing overhead by using block acknowledgment with an all polling technique while attempting to meet latency and QoS requirements. Each node transmits a number of packets upon receiving a polling message. The Access Point (AP) then replies with a Block Acknowledgement (BlockAck), which is combined with a subsequent polling message and contains a bitmap that indicates 1 for a successfully received packet and 0 for a failed reception. | 05-09-2013 |
| 20130215905 | SYSTEM AND METHOD FOR OUT-OF-BAND SIGNALING - A communication network comprises a communication medium and a plurality of nodes. Each node is configured to communicate with the other nodes using a protocol that has at least one of an idle period or a preamble period. The at least one node of the plurality of nodes is configured to transmit an out-of-band signal during at least one of the idle period or the preamble period and is configured to modify at least a portion of the out-of-band signal to communicate data to at least one other node. The at least one other node is configured to interpret the modified portion of the out-of-band signal to identify the data communicated in the modified out-of-band signal. The modified out-of-band signal complies with the protocol's encoding rules such that any node not configured to interpret the modified portion of the out-of-band signal processes the modified out-of-band signal according to the protocol. | 08-22-2013 |
| 20130223455 | ELECTRONIC DEVICE, COMMUNICATION CONTROL METHOD, AND RECORDING MEDIUM - Provided is an electronic device capable of performing stable communications between a plurality of electronic devices connected in series. A communication device ( | 08-29-2013 |
| 20130272315 | CONTENTION GROUPS FOR HIDDEN NODES - Communicating among stations in a network includes, from each of multiple stations in the network, transmitting information indicating which other stations from which that station is able to reliably receive transmissions. A schedule for communicating among the stations is determined based on the information from the stations and transmitting the schedule over the network. The schedule includes a plurality of time slots during which respective contention groups of stations are assigned to communicate using a contention-based protocol. | 10-17-2013 |
| 20130287040 | MANAGING DISTRIBUTED ACCESS TO A SHARED MEDIUM - A method includes determining that a first station has been allocated a first time period to transmit over a shared medium in a network. The method includes transmitting, from the first station to a second station over the shared medium during the first time period, wherein stations other than the first station and the second station refrain from transmitting over the shared medium during the first time period. The method includes receiving, from the second station, a request message to allow the second station to transmit during the first time period and a requested amount of time to transmit. The method includes, in response to allowing the second station to transmit during the first time period, determining an authorized amount of time for the second station to transmit during the first time period, and transmitting an authorization message for the second station to transmit and the authorized amount of time. | 10-31-2013 |
| 20130287041 | MANAGING COMMUNICATIONS OVER A SHARED MEDIUM - Systems and methods for allocating network bandwidth between a plurality of networks. Requests for bandwidth allocation from other networks can be received. A coexistence frame requesting an allocation of bandwidth for a local network can be generated based upon the bandwidth allocation requests received from other networks. The coexistence frame can be transmitted, and utilization of the requested allocation can be delayed by a reservation period. | 10-31-2013 |
| 20130301649 | CSMA/CA for Channels in Power Line Communication (PLC) Networks - Embodiments of methods and systems for Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) with a random backoff time on a Power Line Communication (PLC) network are disclosed. The CSMA/CA method is independent of the algorithm used to update a contention window, so any contention window algorithm is supported. The PLC node runs an energy detection process first and then uses preamble detection only after energy detection is positive, or the node may run both energy detection and preamble detection simultaneously. Upon detection of a possible transmission on a PLC line due to energy detection, the PLC node will freeze a backoff counter decrementing process and will then wait for preamble detection to complete. If no energy is detected on the line, or if no preamble is detected after energy is sensed on the line, then the node will transmit is allowed by the contention window value. | 11-14-2013 |
| 20140071994 | Method and Systems for Full Duplex Communication Using a Single Channel - Current communication systems must not allow signal collision in order to avoid corruption of information. Proposed is a new shared channel system that will allow for more utilization of bandwidth by allowing two signals to collide. This shared channel technique extracts information from the collision of the two signals sent by two different transmitters. The signal of interest is extracted from the collision by undoing the effect of the channel and by removing the known signal from the resultant. This technique makes it possible for full duplex communication with a single communication channel or medium. | 03-13-2014 |
| 20140133496 | COMMUNICATION SYSTEM - In a communication system, nodes are coupled to a transmission path in a bus topology. The nodes communicate with each other via the transmission path using communication signals that have a communication frequency and are synchronized with a power supply signal. Each of the nodes includes a coupling portion that transmits and receives the communication signal and the power supply signal using electromagnetic induction in non-contact with the transmission path. Each of the nodes determines whether a collision of the communication signals occurs on the transmission path based on a voltage level of a signal that has the communication frequency and is induced at the coupling portion. | 05-15-2014 |
| 20140192820 | METHODS AND ARRANGEMENTS TO MITIGATE COLLISIONS IN WIRELESS NETWORKS - Logic for collision mitigation between transmissions of wireless transmitters and receivers operating at different bandwidths. Logic of the receivers may be capable of receiving and detecting signals transmitted at narrower bandwidths. In several embodiments, the receivers comprise a clear channel assessment logic that implements a guard interval (or cyclic prefix) detector to detect transmissions at narrower bandwidths. For instance, a two MegaHertz (MHz) bandwidth receiver may implement a guard interval detector to detect 1 MHz bandwidth signals and a 16M Hz bandwidth receiver may implement logic to detect one or more 1 MHz bandwidth signals and any other combination of, e.g., 1, 2, 4, 8 MHz bandwidth signals. In many embodiments, the guard interval detector may be implemented to detect guard intervals on a channel designated as a primary channel as well as on one or more non-primary channels. | 07-10-2014 |
| 20140233586 | CARRIER SENSE MULTIPLE ACCESS (CSMA) PROTOCOLS FOR POWER LINE COMMUNICATIONS (PLC) - Systems and methods for carrier sense multiple access (CSMA) protocols for power line communications (PLC) are described. In some embodiments, a method may include performing a virtual carrier sensing operation and, in response to the virtual carrier sensing operation indicating that a communication channel is idle, calculating a contention window. The method may also include performing a physical carrier sensing operation subsequent to the virtual carrier sensing operation, the physical carrier sensing operation based, at least in part, upon the contention window. In response to the physical carrier sensing operation indicating that the communication channel is idle, the method may then include transmitting data over the channel. In other embodiments, another method may include determining that a data transmission is a unicast transmission and that an acknowledgement message has not been received. The method may further include incrementing a backoff parameter and repeating one or more carrier sense operations. | 08-21-2014 |
| 20140269758 | METHOD AND SYSTEM OF ENHANCING SIGNAL PROCESSING IN A SHARED MEDIUM NETWORK - A method implemented in a device is disclosed for networking through signals transmitted across a shared medium network. The method starts with monitoring for a first signal on a shared medium of the shared medium network. The first signal is processed after it is received and while the first signal is being processed, a set of one or more signals is received on the shared medium. Then a set of one or more amplitude increases is determined, where each amplitude increase is from an earlier received signal to a later received signal. The set of one or more amplitude increases is compared to a threshold value and at least partially in response to the comparison, the device discards one or more signals from the first signal and the set of one or more signals. | 09-18-2014 |
| 20140355622 | COMMUNICATION SYSTEM - A communication system is provide which includes a plurality of communication units connected to a communication line, in which collisions occur between dominant signals outputted from the communication units on the communication line. At least one of the communication units includes a first driver which is set so that a variation of voltage applied to the communication line in transmission of the dominant signal with respect to that in absence of transmission of the dominant signal is smaller than a variation of voltage applied from another of the communication units to the communication line in transmission of the dominant signal. One of the communication units, which differs from the communication unit including the first driver, includes a second driver which limits variation per unit time of current flowing through the communication line in transmission of the dominant signal. | 12-04-2014 |
| 20150146742 | Data Transmitting and Receiving Method, Data Transmitting and Receiving System, Master Device, and Slave Device - In a data transmitting and receiving method of a demand assignment type, a master device schedules an occupancy band of a fixed size for requesting a band to the master device by slave devices, with respect to a specific number of slave devices for each cycle, and the slave device waits for assignment of the occupancy band of the fixed size based on the schedule and performs message transmission of requesting a band for data transmission to the master device, thereby suppressing an influence of pressure on the data transmission band and preventing line utilization efficiency from decreasing while avoiding signal collision on a Random Channel. | 05-28-2015 |
| 20150381512 | METHOD AND APPARATUS FOR DEFERRING TRANSMISSION - A transmission deferring method is provided by a device in a WLAN. The device receives a frame including duration information indicating transmission deferring duration and address information indicating an address of a target device for the transmission deferring duration, and defers a transmission to the target device during the transmission deferring duration. | 12-31-2015 |
| 20160080169 | EFFICIENT FAIRNESS ALLOCATION IN POWERLINE CSMA/CA PROTOCOLS - Transmission over a communication channel using carrier sense multiple access collision avoidance (CSMA/CA) may be performed by determining for each frame if the communication channel is busy after a backoff time proportional to a randomly generated number within a contention window (CW). When the channel is not busy, a frame of data may be transmitted. When the channel is busy, the device may periodically determine if the communication channel is busy after subsequent backoff times. The value of CW is adjusted for each subsequent backoff time using a fairness protocol, in which the value of CW is increased until the value of CW reaches a maximum CW value; and then the value of CW is held until a fairness number of backoff repetitions reaches a fairness threshold; then the value of CW is reduced incrementally until the value of CW reaches a minimum CW value. | 03-17-2016 |
| 20160142101 | Enhanced Carrier Sense Multiple Access (CSMA) Protocols - Power Line Communications (PLC) device for enhanced carrier sense multiple access (CSMA) protocols are described. The PLC device includes a modem, an AC interface and a PLC engine. The engine is configured for transmitting PC packets over a plurality of electrical wires using a particular channel. Transmitting a normal priority packet may include attempting to access a communications channel to transmit a frame after a backoff time proportional to a randomly generated number within a contention window (CW), the CW having an initial value carried over from a previous transmission of a different frame. Additionally or alternatively, some of techniques described herein may facilitate the spreading of the time over which devices attempt to transmit packets, thereby reducing the probability of collisions using, for example, Additive Decrease Multiplicative Increase (ADMI) mechanisms. | 05-19-2016 |
| 20170237527 | DATA ACKNOWLEDGEMENT IN A WIRELESS COMMUNICATION SYSTEM | 08-17-2017 |
| 20180027597 | METHOD AND APPARATUS FOR UPLINK TRANSMISSION IN AN UNLICENSED BAND | 01-25-2018 |
| 370447000 | Arbitration for access between contending stations | 17 |
| 20090010276 | Contention Groups for Hidden Nodes - Communicating among stations in a network includes, from each of multiple stations in the network, transmitting information indicating which other stations from which that station is able to reliably receive transmissions. A schedule for communicating among the stations is determined based on the information from the stations and transmitting the schedule over the network. The schedule includes a plurality of time slots during which respective sets of stations are assigned to communicate using a contention-based protocol. | 01-08-2009 |
| 20090041050 | Adaptive medium access control for wireless communication system - A method is provided for adapting a contention window for a given node in a wireless communication system. The method includes: defining a target parameter indicative of congestion on a transmission medium; determining a number of transmitting nodes ready to access the transmission medium; and determining a contention window from which to select a delay value for transmitting over the transmission medium, where the contention window is a function of the target parameter and the number of transmitting nodes. | 02-12-2009 |
| 20090059949 | Method and system for data packet communication in wireless communication systems - The present invention provides a method and system for data packet communication in wireless communication systems. One embodiment involves determining if one or more data blocks pending transmission in a current transmission opportunity period over the channel will expire before the start of another transmission opportunity period, and if a data block will expire before the start of another transmission opportunity period, then extending the current transmission opportunity period by an extension period for transmitting the expiring data block during the extension period. One or more expiring packets are transmitted during the extension period on a best-effort basis. | 03-05-2009 |
| 20090067448 | Contention-Based Communication - For an example embodiment, a method for a communication device operating in a synchronous communication system is described. The method includes performing a listen-before-talk (LBT) procedure prior to the start of a downlink subframe of a synchronous frame and determining if a transmission from another communication device of another communication system is detected during the LBT procedure. In the case that a transmission is detected during the LBT procedure, the communication device refrains from transmitting during the downlink subframe. In the case that a transmission is not detected during the LBT procedure, the communication device transmits during the downlink subframe. | 03-12-2009 |
| 20090103558 | Hybrid Contention-Based and Schedule-Based Access to a Communication Link - One or more embodiments taught herein provide a hybrid access arrangement using a contention-based channel and a scheduled channel on a communication link. As a point of significant efficiency, given users transmit autonomously on the contention-based channel, without need for scheduling overhead. However, if a contention overload occurs on the contention-based channel, the involved users are identified from unique signature sequences included in their user transmissions. The identified users are temporarily managed as scheduled users on the scheduled channel, which supplements the contention-based channel and therefore may use limited communication link resources in comparison to the contention-based channel. Users not involved in the contention overload generally continue operating on the contention-based channel. | 04-23-2009 |
| 20090141737 | SYSTEMS AND METHODS FOR PRIORITIZED CHANNEL ACCESS HARDWARE ASSISTANCE DESIGN - Systems, networks and methods are provided that are operable for network communication among devices that have a medium access control (MAC) sublayer operable to build and forward at least a frame for network communication, a physical (PHY) layer operable to transmit at least a frame received from the MAC sublayer, and a prioritized, contention-based channel access mechanism (PCA) coupled to the MAC sublayer and having contention access logic for assessing whether a frame transmission may commence and an interrupt service routine for initiating transmission by the PCA of the at least a frame. | 06-04-2009 |
| 20100158039 | COMMUNICATION METHOD AND COMMUNICATION DEVICE - A communication method for performing a communication among a plurality of communication devices sharing a communication band, includes a first step of transmitting notification signal during a first period to notify information for arbitrating the communication device capable of performing data transmission during a second period subsequent to the first period, and a second step of transmitting data from the communication device, capable of performing the data transmission during the second period based on the notification signal transmitted during the first period, in specific period in the second period allocated to the data transmitted from the communication device. | 06-24-2010 |
| 20120147899 | Media Access Control (MAC) Layer for Power Line Communications (PLC) - Systems and methods for a media access control (MAC) layer for power line communications (PLC) are described. In some embodiments, a method may include receiving packets for transmission, each packet associated with a priority code, each priority code unrelated to its corresponding packet's time or order of arrival. The method may also include transmitting a first subset of packets having priority codes higher than priority codes in a second subset, and buffering the packets in the second subset for later transmission. Another method may include identifying a link quality indicator (LQI) associated neighboring service nodes, selecting one of the service nodes with highest LQI, and transmitting a promotion needed packet data unit to the selected service node. Yet another method may include communicating an Internet protocol (IP)-based message to a PLC device that excludes mesh header information, fragmentation header information, and/or the IP address of the PLC device. | 06-14-2012 |
| 20120224590 | METHOD AND APPARATUS FOR DYNAMIC MEDIA ACCESS CONTROL IN A MULTIPLE ACCESS SYSTEM - An electronic device may be operable to control access to a physical medium (e.g., airwaves, a copper cable, or an optical fiber) utilizing carrier sense multiple access (CSMA). The amount of time that the electronic device must sense the physical medium as being inactive before it permits transmission of a message onto the physical medium may be determined based on: the size of the message, the type of the message, the symbol rate at which the message is to be transmitted, and/or a channel onto which the message is to be transmitted. Similarly, other aspects of how and when electronic device transmits and/or receives on the physical medium may be controlled via one or more dynamically configurable parameters which may be configured based on characteristics of received and/or to-be-transmitted messages. | 09-06-2012 |
| 20130070781 | PROBABILISTIC CONTENTION WINDOW MANAGEMENT - Method and apparatus for communicating via a network. In one embodiment, a device for communicating via a network includes a medium access controller (MAC). The MAC is configured to apply a contention window for collision avoidance on the network, and to determine whether the network is free for use on expiration of a time value of the contention window. The MAC is also configured to initiate a transmission based on a determination that the network is free for use. The MAC is further configured to increase, in accordance with a predetermined probability value, the time value of the contention window based on: the transmission being successful; and the time value of the contention window being a minimum contention window time value. The probability value establishes the likelihood of the MAC increasing the time value of the contention window with respect to successful transmissions with the minimum contention window time value. | 03-21-2013 |
| 20130343403 | Retransmission Mechanism for Segmented Frames in Power Line Communication (PLC) Networks - Embodiments of methods and systems for transmitting and receiving segmented frames in a Power Line Communication (PLC) network are disclosed. A transmitter sends a first segment using CSMA/CA based on the priority of frame. All the other segments are transmitted using the CFS slot. When an ACK is received, transmitter sends the next segment after CFS. When a NACK is received, the transmitter sends just the last segment after CFS. If no ACK/NACK is received, the transmitter sends the last segment using CSMA/CA. If a NO_EARLIER_SEGMENTS delimiter is received, the transmitter sends the frame starting from the first segment using CSMA/CA. A receiver may send the NO_EARLIER_SEGMENTS delimiter when no earlier segments are in a receive buffer for reassembly. If the receiver is expecting to continue the reassembly of another frame when a segment is received, the receiver may transmit a BUSY_REASSEMBLY delimiter. | 12-26-2013 |
| 370448000 | Using weighted back-off timing | 6 |
| 20080212604 | SYSTEMS AND METHODS FOR CONTENTION CONTROL IN WIRELESS NETWORKS - Systems and methods provide for controlling contention in a wireless network device. The systems and methods transmit a packet on a wireless network. If the transmission is not successful, then a contention window parameter is adjusted according to a fast backoff operation. If the packet transmission was successful and the current value of the contention window parameter is less than a threshold value then the contention window parameter is decreased according to a contention avoidance operation. If the packet transmission is successful and the current value of the contention window parameter is greater than the threshold value then the contention window parameter is decreased according to a slow start operation. | 09-04-2008 |
| 20080279210 | Communication Apparatus - A communication apparatus exhibiting improved certainty and stability in communication. In a wireless terminal ( | 11-13-2008 |
| 20090074003 | METHOD AND SYSTEM FOR CONSOLIDATING TCP PORTS - A system for consolidating TCP ports. In response to initiating a connection to a hidden port via a network, a TCP in TCP packet is created. Then, the TCP in TCP packet is sent to the hidden port via the network via a network visible port. | 03-19-2009 |
| 20090074004 | Back-off-state assignment for channel throughput maximization of wireless networks - A method, system and computer program product for maximizing throughput by assigning nodes to the states of a given back-off level non-uniformly when experiencing channel contention. The back-off-state assignment process of the present invention can provide a novel and non-obvious assignment method, system and apparatus for assigning a node at back-off state s(i, k) in order to ensure fairness among nodes and to reduce channel contention. To achieve the foregoing effect, the back-off state assignment process of the present invention can set a back-off counter value for a given node to a randomly selected higher value with a greater probability. | 03-19-2009 |
| 20090141738 | Reservation-Based Distributed Collision Avoidance Channel Access For Wireless Local Area Networks - Each station on a wireless network comprises memory indicating whether it is in an IN or an OUT state; a reservation store storing reserved time slots of other stations on the network; a backoff counter (BC) value determination engine for selecting an unreserved time slot in the reservation store as the next time slot for a next transmission if in the IN state, and for determining the next time slot according to a predetermined algorithm if in the OUT state; and a medium access engine for initiating a current transmission during a previously reserved time slot and after a first idle interval if in the IN state, and for initiating the current transmission during a previously determined time slot and after a second idle interval shorter than the first idle interval if in the OUT state, the current transmission identifying the next time slot. | 06-04-2009 |
| 20140064301 | Transmitting Data - A communication device capable of transmitting data on a communications channel, the communications channel capable of being shared with a number of stations, the communication device being configured to determine a back-off period, the back-off period being a period of time for which the communication device delays transmission of data after determining that the communications channel is idle, wherein the communication device is configured to determine the back-off period in such a way as to favour a decrease in the back-off period in response to an increase in the number of stations. | 03-06-2014 |
