93 results about "Channel availability" patented technology

Using Bluetooth to provide the network management functions such as device discovery, service discovery, security negotiation, and connection establishment. Upon a Bluetooth connection being established between the Bluetooth-enabled devices an IP channel availability query is made. This is accomplished by using information request signals from the Bluetooth L2CAP protocol layer. If an IP channel is available on both the devices and the communication modules using that IP channel are compatible the devices will then establish a secondary Internet Protocol (IP) based data channel between them.

A LAN has a wireless portion which includes access points and wireless communications devices and a wired portion which includes such things as routers, servers, and a PBX. The LAN operates in a radio frequency band where certain channels (DFS channels) are shared with a signal that is of higher priority than the communications signals transmitted and received by the access point and the wireless communications devices. If a higher priority signal is sensed on a particular channel of the wireless medium by a master device, it is necessary for all of the slave devices communicating on this channel to stop transmitting on that channel within a short period of time. The wireless communications devices are mobile and can be easily transported around in space or roam during a communications session. While roaming during a communications session, it is likely that the communications device will move out of range of an access point with which it is currently associated and possibly cause the session to end prematurely, and so it is important that a handoff procedure operates so that a communications session is continuous as the communications device roams from access point to access point. By setting and maintaining a timer dedicated to each available DFS channel, it is possible to ensure that the communications sessions is not interrupted during the roaming process in an environment were certain channels are shared with a higher priority signal.

An object-oriented system for managing multiple media types in a communication center environment has a multimedia queuing system, a processor for processing events in the queue, an interaction server for selecting media type or event types, a resource manager for reporting availability of a resource access point, and a data store for storing client information about media types available to the client and historical information about success of past use of those media types. In a preferred application, the system processes and routes incoming events of known media type to access points defined as systems or agents based in part on media channel availability of the access point, and wherein the system selects a media channel or channels for certain events in queue that are not pre-dedicated as specific media type events but are generated outbound or internal proactive contact events. For proactive contact events, the system automatically selects a media channel for each event based on a combination of set preferences and predictions based on historical channel information relating to success channel connections to that client.

A system to improve user messaging in a mobile device by providing an intelligent interactive travel as a GUI that receives verbal and text input and outputs offers to provide travel-related information, offers to provide travel-related actions, offers to send a travel-related communication, or offers to save travel-related information, wherein processing content of the user input comprises analyzing message content to collect travel-related parameters relating to geographic travel path, airport information, air travel route information, airline flight information, flight availability, flight status, flight booking information, flight cancelling information, airport fees, baggage fees, local and remote ground transportion options, local and remote weather information, message priority, channel type, channel availability, user schedule, user time zone, user time and date, user travel-related preferences, type of content, and number of recipients, and saving said collected parameters to memory, wherein the travel-related parameter is calculated using a travel-related index, the travel-related index comprising a numerical value based on travel-related hierarchy, wherein the one or more programs include instructions for providing feedback to the user wherein the feedback comprises a graphical or spoken output from the portable electronic device, said output comprising information linked to the user schedule and one or more travel-related parameters, wherein the user schedule parameter is compared to a travel-related parameter and a scheduling database is populated with an entry that uses the comparison data and, wherein specific customized travel-related profile parameters are set to establish priority overrides where a user schedule has a different priority than a travel-related parameter.

A system and method for achieving enhanced CSMA / CA which improves channel availability and quality of service (QoS) in a wireless communications network. The system and method establish channels to enable communication between nodes in a communication network, based on the relationship between the average time length of message data packets and the time lengths of the request to send and clear to send messages. A node of the communication network places a data packet at a location in a queue for retransmission based on a type of information contained in the data packet if the destination node for which the data packet is intended is unable to receive the data packet. The location in the queue is indicative of a duration of time that the node will delay before attempting to resend the data packet to the destination node.

A wireless sensor network and data transmission method thereof provides for improving channel access efficiency and energy saving effect by using inventive carrier sensing mechanism. The data transmission method includes assessing a channel after initializing, when a packet to be transmitted is generated, a number of carrier sensing attempts (Ns) and a backoff value (W); determining, when the channel availability is assessed to be idle, whether W reaches 0; transmitting the packet if W reaches 0; and reassessing, if W does not reach 0, the channel after a duration corresponding W / (Ns-1) slot.

A method and an apparatus for transmitting error-tolerant data is disclosed employing the ARQ technique, wherein the retransmission of erroneous data is performed up to the point where the remaining amount of errors is acceptable (for instance because the erorrs will not be perceived by the recipient of the information, which can be a person or a higher level protocol with additional error correction capabilities). The number of data blocks (RLC) detected as erroneous is employed to define a reliability measure (RM) and a request for retransmission of the erroneous data blocks is performed until a desired reliability threshold (RT) is reached. An additional threshold with a higher value than the first one can be employed to request for optional retransmission when the reliability measure (RM) is between the first and the second threshold. The retransmission will be performed only if further conditions such as channel availability are met.

In described embodiments, a channel allocation system, such as a white space (WS) channel allocation system, employs a method to populate a WS database with channel availability information for areas with protected or otherwise registered service user information server. Communication characteristics of incumbent service providers licensed or otherwise registered to operate within certain frequency spectrum are plotted over a geographic area. The channel allocation system then divides the area into tiles, and determines whether each tile can be characterized for channel availability and, for those tiles that are uncharacterized, further divides the tiles into tiles of finer resolution. Based on information in the WS database, availability of channels in areas is pre-computed, and then an iterative search of areas with successively finer resolution identifies white space channels that might be included in the channel list in response to a query from a unlicensed or unregistered user.

A proactive adaptive radio methodology for the opportunistic allocation of radio spectrum is described. The methods can be used to allocate radio spectrum resources by employing machine learning to learn models, via accruing data over time, that have the ability to predict the context-sensitive durations of the availability of channels. The predictive models are combined with decision-theoretic cost-benefit analyses to minimize disruptions of service or quality that can be associated with reactive allocation policies. Rather than reacting to losses of channel, the proactive policies seek switches in advance of the loss of a channel. Beyond determining durations of availability for one or more frequency bands statistical machine learning also be employed to generate price predictions in order to facilitate a sale or rental of the available frequencies, and these predictions can be employed in the switching analyses The methods can be employed in non-cooperating distributed models of allocation, in centralized allocation approaches, and in hybrid spectrum allocation scenarios.

The invention relates to a method for accessing an 802.11 wireless network channel under centralized control. On the premise of retaining a competitive mechanism, the method changes a random backoff channel accessing mode into a wireless controller (AP, access point)-based centralized control mode, thus optimizing the following problems in the channel accessing process: (1) the waiting time for random backoff of a station (STA) is not necessary and different inter-frame space (IFS) durations are uniformly replaced by a short inter-frame space (SIFS) duration, thus reducing time delay of frame transmission, improving the use ratio of a channel and greatly increasing the throughput of a system; (3) when multiple stations compete for channels simultaneously, the occurrence of collision is avoided, the accessing time delay of the stations is reduced, and the packet loss rates of the stations are reduced; and (4) stations do not use channel availability assessment (CAA), thus reducing energy consumption of the stations.

A method for increasing channel utilization in a video broadcast system includes receiving, at a head-end, a request for a video program from one of a plurality of subscriber stations. Determining whether the requested video program is associated with a first subset of channels representing broadcasted channels having a first subscriber viewership level greater than a threshold level, a second subset of channels representing broadcasted channels having a second subscriber viewership level less than the threshold level, and a third subset of channels representing on-demand channels having a third subscriber viewership. The first subset of broadcast channels is substantially continuously transmitted. The second subset of broadcast channels is transmitted based upon channel availability and programming assignments. The third subset of on-demand channels are transmitted from the head-end to at least one of the plurality of subscriber stations upon assigning video programming corresponding to the requesting subscriber station.

A communication policy server may receive channel availability information indicative of a plurality of communication channels detected by a communication manager of a vehicle, each of the plurality of communication channels configured to provide messages to a target recipient associated with the vehicle. The communication policy server may recommend one of the plurality of detected communication channels as optimal based on factors such as preferences of the target recipient and preferences of the message source, the timing of the messages and the content of the messages.

A communication policy server may receive channel availability information indicative of a plurality of communication channels detected by a communication manager of a vehicle, each of the plurality of communication channels configured to provide messages to a target recipient associated with the vehicle. The communication policy server may recommend one of the plurality of detected communication channels as optimal based on factors such as preferences of the target recipient and preferences of the message source, the timing of the messages and the content of the messages.

A method for sensing channel availability in a wireless network includes receiving a measurement request message which includes a channel interval list. A first channel interval in the list includes information associated with a first starting channel number, a first number of channels, and first linkage information of the channel interval list. The method includes processing information associated with the message, generating a first list of contiguous channels, and performing at least first channel measurement to determine a first channel availability for each of the first list of contiguous channels. The method also includes determining whether the channel interval list further includes a second channel interval that needs to be processed based on at least first linkage information, and if needed, generating a second list of contiguous channels and performing at least second channel measurement to determine a second channel availability for each of the second list of contiguous channels.

A Wi-Fi system includes a plurality of access points each configured to operate on a plurality of channels including Dynamic Frequency Selection (DFS) frequency channels and non-DFS frequency channels; and at least one access point of the plurality of access points is connected to a controller, wherein the controller is configured to coordinate usage of the plurality of channels between the plurality of access points including usage of the DFS frequency channels pursuant to predetermined DFS rules. One or more access points of the plurality of access points are configured to perform DFS measurements for a Channel Availability Check (CAC) and the DFS measurements are provided to the controller.

Methods, systems, and devices are described for wireless communication at an AP. A station (STA) serving as a soft access point (SAP) in master mode may be configured to support communication over two radar channels (e.g., a primary and secondary channel) simultaneously. The STA may detect radar on the primary channel and move the primary channel to the secondary channel; meanwhile, the secondary channel may be moved to a channel in a non-radar subband. In some cases, the STA may establish a primary channel in a non-radar subband and then advertise a single bandwidth capacity. the STA may then perform a channel availability check (CAC) on a radar subband. If the CAC is successful, the STA may establish a secondary channel on the radar subband (or move the primary channel to the radar subband) and advertise a dual bandwidth capacity.

A method and an apparatus for transmitting error-tolerant data is disclosed employing the ARQ technique, wherein the retransmission of erroneous data is performed up to the point where the remaining amount of errors is acceptable (for instance because the erorrs will not be perceived by the recipient of the information, which can be a person or a higher level protocol with additional error correction capabilities). The number of data blocks (RLC) detected as erroneous is employed to define a reliability measure (RM) and a request for retransmission of the erroneous data blocks is performed until a desired reliability threshold (RT) is reached. An additional threshold with a higher value than the first one can be employed to request for optional retransmission when the reliability measure (RM) is between the first and the second threshold. The retransmission will be performed only if further conditions such as channel availability are met.

A method and apparatus is provided for applying an electroding tone to a power conductor located in an undersea optical cable employed in an undersea optical transmission system having at least one repeater. The method begins by applying a DC line current to the power conductor. The DC line current has a value sufficient to power the repeater and less than a value sufficient to power the repeater and to perform electroding. An AC current is impressed on the DC line current at a prescribed frequency and a peak-to-peak amplitude ranging from zero and a prescribed value to generate the tone. The impression or application of the AC current is terminated after a period of time at least sufficient to locate the optical cable or an optical cable fault.

The invention discloses a Zigbee information channel dynamic selection method based on real-time availability. In the invention, the concept of information channel availability is provided for the first time, the information channel availability is updated by the availability algorithm in real time, and information channels can be dynamically selected according to availability sequence in an information channel resource pool, which is marked by a broken line in the figure. Parameters for the information channel availability indicate the vacancy rate and communication quality of the information channel and show practical available conditions of the information channel. Therefore, the parameters for the information channel availability can be used for guiding selection of the information channel in practical data transmission, so as to provide a communication support, increase the data transmission success rate, and reduce the collision rate and retransmission rate to the largest extent. Based on the vacancy rate and quality of the information channel, data transmission results and other parameters, the invention provides the real-time availability algorithm. The real-time availability algorithm not only provides a high-quality vacant information channel with more selection chances, but also ensures the fairness of information channel selection to the largest extent and enables the information channel to be selected by relative fair chance, thereby improving the utilization rate of the information channel. In the invention, the strategy to build the information resource pool to manage information channel resources is provided; information channels are sequenced based on the parameters for the information channel availability; and the ZigBee information channel is selected according to the sequencing result, thereby realizing the Zigbee information channel dynamic selection method based on real-time availability.

Method and system for network discovery and selection in wireless network systems. According to an embodiment, the present invention provides a wireless communication system. The system includes a first access network that is connected to a content service network. The first access network includes a base station to provide wireless access to wireless devices within a first region through a plurality of communication channels. The plurality of communication channels includes a broadcast channel. The first access network is configured to send broadcast messages through the broadcast channel. The broadcast message includes a first broadcast message, which includes channel availability information. The system also includes a wireless device. The wireless device includes an antenna and a wireless interface. The wireless interface is adapted to receive at least the first broadcast message.

A spectrum management server generates and an electronic device uses a channel map solution for a predetermined travel route of the electronic device. The channel map solution includes at least one available channel for each of the plural geographic areas through which the planned travel route passes. At least two adjacent ones of the geographic areas have different channel availability.

The invention discloses an information sending method used for solving the technical problem that a WLAN (Wireless Local Area Network) device takes a relatively long time to perform radar detection. The information sending method comprises the steps that an AP performs CAC (Channel Availability Check) for a first channel to determine whether a radar signal exists in the first channel; and if the radar signal exists in the first channel, the AP sends a CAC result to a WLAN control device or other AP, wherein the CAC result comprises the identifier of the first channel. The invention also discloses an information receiving method and corresponding devices.

The invention discloses a data link anti-interference method based on autonomous interference detection and real-time channel allocation. Targeted at a contradiction between low-delay transmission and anti-interference processing in a data link system applied to missile catching and controlling operation, channel interference detection and assessment are performed autonomously through receiving equipment, and available channels are selected autonomously, so that the anti-interference capability of the data link system is enhanced. The receiving equipment performs repeated sampling, statistics and assessment on the channels in sequence according to set frequency sweeping time. Real-time channel availability is given according an interference judgment condition. After available channels are found, working frequencies of a transmitting end and a receiving end are controlled through an instruction in order to rapidly switch to a target channel. Through adoption of the method, interference on the low-delay data link system is avoided on a system level; the equipment anti-interference processing complexity and cost are lowered; and the anti-interference capability of the system is improved remarkably.

The invention discloses a distance tree protocol frame of MAC layer based on an OSA technology, and relates to a protocol frame of MAC layer based on an OSA technology in a wireless communication network. The protocol frame mainly comprises the following two parts: 1. building a distance tree model used for identifying the availability of a primary user channel, and establishing a channel availability list in a base station of a primary and secondary user; 2. building a utility function from the view of fairness and designing the spectrum access strategy. The basic idea of the frame is to build the channel availability list between the primary user and the secondary user respectively according to distance and maximum allowable interference power, which is taken as the reference of channelperceiving and access, and as the reference for realizing resource sharing of fair spectrum between the secondary users. The basic application environment of the protocol frame is a self-organizing network environment in which the multi-primary users and multi-secondary users exist at the same time.

The invention discloses a channel availability detection method and system, and a spectrum management method, which are applied in a cognitive radio system. The detection method comprises the following steps that: a network element in a secondary system issues a channel monitoring command and indicates cognitive users to monitor the primary user signal of an appointed channel; and for each channel, the network element calculates the channel availability of the channel by adopting an exponential type model according to the values of the interference parameters of the channel reported to each cognitive user within a period of time. The spectrum management method comprises the following steps that: the network element carries out channel priority ordering according to the calculated values of the channel availability and distributes an available channel with the highest channel priority for the cognitive users issuing a channel request after the calculation of the channel availability is completed according to the method. After the detection method with channel availability and the spectrum management method and system are adopted, the channel distribution of the cognitive users on a network side is more reasonable, channel switch is reduced, and the channel availability detection method and system and the spectrum management method are beneficial to the performance stability of the network.

Embodiments of the present invention relate cognitive radar and RF technologies, and more particularly, to spectrum sensing processing for rapidly monitoring the RF spectrum for channel availability and activity. The goal is to find and use unoccupied RF channels to broadcast and receive information. According to one embodiment, a method for analyzing a received RF signal to determine unused channels, or frequencies, therein, comprises: analyzing a received RF signal to determine anchor points that represent high energy frequency locations; calculating distances between the determined anchor points; identifying and eliminating clusters or isolated anchor points defined as a high energy region of interference based on the calculated distances; and selecting at least one remaining unoccupied frequency for transmitting or receiving a RF signal. The method may further include performing an optional quality or risk assessment on remaining frequencies of the waveform, and eliminating high risk frequencies from consideration in some instances.

A system and method for detecting spectrum holes in a region is disclosed. The system comprises a requesting module, a detecting module and an aggregation module. The requesting module retrieves channel availability data for a region. The channel availability data describes potential availability of a channel. The detecting module obtains a set of values for the channel by spectrum sensing at a set of locations in the region based at least in part on the potential availability of the channel. The aggregation module aggregates the set of values for the channel over the set of locations in the region to obtain a first value for the channel and determines the availability of the channel based at least in part on the first value for the channel.

The present disclosure is directed generally to systems and methods for scheduling dynamic frequency selection channel availability checks. The systems and methods may include detecting lull times in between servicing clients, and scanning for channel availability during the lull times.