164 results about "Beacon interval" patented technology

A clustering based load adaptive sleeping protocol for ad hoc networks includes a plurality of nodes forming a cluster, where the nodes in the cluster are partitioned into n groups. This partitioning is performed based on the node ID (e.g. node_id modulo n). The cluster head transmits a beacon at fixed intervals. The beacon interval is divided into N slots, where N is a multiple of n. Node sleep / activation times are synchronized to the beacon interval slots. The node's group number is used to determine the slots within a beacon interval that a node begins it s sleep cycle. Therefore, no additional signaling is required between nodes to indicate sleep patterns. The sleeping time of each node may be increased when extended periods of inactivity are detected according to an adaptive procedure.

An operation method in heterogeneous networks, and a gateway and a wireless communication device using the same are disclosed. The operation method in heterogeneous networks includes followings. When a gateway, connecting a first communication network and a second communication network, operates in a beacon mode, the gateway determines whether the first communication network is in an allowed period or a forbidden period, and generates a determination result. Then, the gateway adaptively adjusts a ratio of a superframe duration to a beacon interval of a periodic beacon of the second communication network according to the determination result. In addition, the gateway is connected to a M2M communication server via the first communication network, and the gateway is connected to at least one M2M communication device via the second communication network.

A method and apparatus for improving power performance of a wireless adapter which adopts a time slicing scheme by dividing a beacon interval into multiple slices, and assigning these slices to the stations through the beacon frame. The stations wakeup at the appointed slices to receive their buffered frames from an access point, and may enter into sleep state once the transactions conclude. A further embodiment including formatting data into a control frame for use in a wireless local area network, the frame including an indication, for each station associated with the wireless local area network, whether frames are buffered awaiting transmission to each respective station, a number of time intervals between control frames, and at which time interval the transmission of the buffered frames will begin for each station having buffered frames awaiting transmission.

The present invention is to provide each communication station with a transmission prioritised period without any useless latency in an ad-hoc communication environment including no control station. For this end, each communication station periodically transmits the beacon signal and acquires the transmission prioritised period immediately after transmission of the beacon. If the number of communication stations in the network is small, a communication station transmit a supplementary beacon within the super frame period, thereby effectively shortening the beacon interval and reducing latency at the start of transmission. At the time when a new communication station enters the network, the supplementary beacon is released in order to accommodate such new communication station.

A method for transmitting a hello packet from a plurality of nodes in a mobile ad hoc network (MANET). The nodes have a predetermined identical counter value. The nodes to simultaneously wake up during a predetermined beacon interval (BI) according to the predetermined counter value, and maintain an awake state in order to transmit / receive the hello packet.

A clustering based load adaptive sleeping protocol for ad hoc networks includes a plurality of nodes forming a cluster, where the nodes in the cluster are partitioned into n groups. This partitioning is performed based on the node ID (e.g. node_id modulo n). The cluster head transmits a beacon at fixed intervals. The beacon interval is divided into N slots, where N is a multiple of n. Node sleep / activation times are synchronized to the beacon interval slots. The node's group number is used to determine the slots within a beacon interval that a node begins it s sleep cycle. Therefore, no additional signaling is required between nodes to indicate sleep patterns. The sleeping time of each node may be increased when extended periods of inactivity are detected according to an adaptive procedure.

The present invention relates to Wireless Local Area Networks and Access Points in such networks, in particular it relates to the control and use of varying beacon intervals in such networks. According to the present invention, the beacon frames in the Wireless Local Area Network are provided with an adaptive beacon interval. The interval is adapted in dependence on a current network load such that the length of the beacon interval is decreased when the network load is decreased and increased when network load is increased. The invention is applicable in existing as well as future IEEE 802.11 standards.

The invention relates to a method for controlling power consumption in a short-range wireless terminal. In order that the power save mode could be adapted to the traffic pattern of the terminal, the data traffic of the terminal is monitored and at least one parameter describing the data traffic is defined. Based on said at least one parameter and the beacon interval information received in beacon frames, the power state of the terminal is dynamically controlled so that the terminal is maintained in one of at least two power states including an active state and a power save state.

Techniques for establishing a dynamic ad-hoc wireless network are disclosed. A node transitions between wake and sleep modes during periods defined as beacon intervals. Before a network connection is established and while it is awake, the node transmits network connection request and also listens for network activity. If a beacon or response message is not detected while the node is listening, the node enters sleep mode and thereby conserves power. The node optionally changes the duration of its detection period and / or the time at which it listens for network activity relative to the start of each beacon interval. Information elements are optionally included with transmitted beacons or response messages.

A method and system or access point (AP) for performing a data transmission process supporting power management of wireless local area network (WLAN) clients comprises the steps of and means for performing the following functions, respectively: when data are received through a network, storing the data selectively, wherein the received data are not stored in a memory when a current operation timing is in a first timing interval, and the received data are stored in the memory when the current operation timing is in a second timing interval; generating a beacon frame after determining whether data to be transmitted to the WLAN clients are stored in the memory according to a beacon frame generation interval; transmitting the generated beacon frame to the WLAN clients every beacon interval; and, when the transmission of data stored in the memory during the second timing interval is requested from the WLAN clients, transmitting the appropriate data to the WLAN clients. As a result, power consumption by remote stations is minimized.

A method and system access a channel in a wireless network of nodes. A coordinator transmits periodically a beacon, in which time between two consecutive beacons constitute a beacon interval. The coordinator and other nodes transceive a superframe during the beacon interval, in which the superframe begins with an active interval, which is immediately followed by an inactive interval, and in which the active interval begins with a contention free period, which is immediately followed by a contention access period, which is immediately followed by the inactive interval.

IEEE 802.11 power management scheme for an ad hoc network is based on the Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA) access procedure to transmit / receive their data frames. CSMA / CA may waste the scarce energy and bandwidth due to frame collisions and lengthen the frame delay due to waiting backoff time. In addition, IEEE 802.11 power management scheme does not specify how to tune the ATIM window size in a beacon interval. However, the ATIM window size affects the power consumption and throughput of a network considerably. The fixed ATIM window size cannot always accommodate the various traffic conditions. To conquer these problems and to improve the performance of networks, we propose a energy efficient MAC protocol for IEEE 802.11 networks by scheduling transmission after the ATIM window and adjusting the ATIM window dynamically to adapt to the traffic status.

The invention relates to a method for broadcasting beacon frames in a short-range wireless ad-hoc network including a plurality of wireless terminals. In order to improve the efficiency of the ad-hoc network in terms of power consumption, the terminal that defines the beacon interval for the network starts as a beacon broadcaster and introduces an identifier list in at least some of the beacon frames broadcast in the network. The identifier list, which includes identifiers of the wireless terminals belonging to the network, is utilized if another wireless terminal is to be selected as the beacon broadcaster.

A method is described for adaptive load-balancing and graceful termination of access points in a network having a plurality of access points. The method includes determining a need to reduce a load of a first access point, and increasing a beacon interval corresponding to the first access point in order to detract clients. Correspondingly, beacon intervals for other access points may be reduced in order to attract more clients.

A method and a system for streaming multi channel digital isochronous data. The method is used for streaming multi channel digital isochronous data, e.g. audio data, in a standard wireless local area network transmission system where bandwidth is reserved for both contention-based traffic and contention free traffic and the audio data formed by samples is organized in audio frames and sent to receivers using multicasting, within consecutive beacon intervals. The contention free traffic of the beacon interval is adjusted to an optimum value, and the length of the beacon interval is adjusted such that a required amount of audio data can be sent to the receivers with minimum system delay.

The invention provides a wireless personal area network (WPAN) device, in which a beacon reception interval is set to vary in response to data reception and the power level of the device and a method for controlling beacon reception thereof. The WPAN device includes a receiver for receiving beacons at a predetermined interval, a frame analyzer for analyzing beacons, and a data-storing part for storing the information analyzed by the frame analyzer. The device further includes a traffic monitor for monitoring data reception, a power level detector for detecting power level, a beacon interval setter for setting the beacon interval in response to data reception and the power level, and a reception controller for controlling the beacon reception according to the set interval. A method for managing low power consumption in the WPAN device is also proposed.

A method for transmitting a flooding ad hoc traffic indication message (FATIM) in a power save mode whose beacon interval is divided into an ad hoc traffic indication message (ATIM) window and data transmission window subsequent to the ATIM window, in a mobile ad hoc network (MANET) constituted by a plurality of nodes. When one of the plurality of nodes has data to be forwarded to different nodes, a FATIM frame indicating that a network broadcast message will be sent to its neighbor nodes is forwarded during the ATIM window. If a current ATIM window has not expired, at least one different node of the plurality of nodes receiving the FATIM frame forwards the received FATIM frame to its neighbor nodes.

In this application is described a method and a system for collecting streaming multi channel digital isochronous data from multiple independent digital signal sources. The method is used for collecting streaming multi channel digital isochronous data, e.g. audio data, in a standard wireless local area network transmission system where bandwidth is reserved for both contention-based traffic and contention free traffic and the audio data (10) formed by samples (9) is organized in audio frames (174) and sent to receivers (6) using multicasting, within consecutive beacon intervals (137). In accordance with the invention the contention free traffic (138) of the beacon interval (137) is adjusted to an optimum value, and the length of the beacon interval (137) is adjusted such that a required amount of audio data (9) can be sent to the receivers (6) with minimum system delay.

A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmitting and receiving data between the plurality of terminals and one AP (access point); a verification unit configured to verify the terminal information, group the terminals into terminal groups by using the terminal information, and verify virtual APs which respectively correspond to the terminal groups, in the AP; and a transmission unit configured to transmit beacon frames in the virtual APs, to the terminals included in the terminal groups, wherein the beacon frames include beacon interval information, beacon duration information, beacon offset information, and terminal group information.

Embodiments of a millimeter-wave communication station and method for scheduling association beamforming training (A-BFT) with collision avoidance are generally described herein. In some embodiments an initiating station transmits a transmit sector-sweep frame in each of its antenna sectors and receives a reverse transmit sector-sweep frame from two or more unassociated responding stations. The initiating station transmits a sector-sweep feedback frame to each of the responding stations to indicate whether each responding station is to perform beamforming training in a current beacon interval or a subsequent beacon interval. The sector-sweep feedback frame may indicate an order in which the responding stations are to perform beamforming training in subsequent beacon intervals.

In accordance with the invention, a method, system and apparatus for saving power consumed by a station in an ad hoc wireless network are presented. The method comprises transmitting or receiving a signal by a station in the ad hoc wireless network during a beacon interval. The station enters a power saving doze state immediately following the transmission or reception of the signal and prior to the end of the beacon interval. Additionally or alternatively, the station may enter power saving doze state following a timed period, according to a counter, or according to a periodic pattern.

To realize a wireless communication system capable of keeping a beacon interval fixed, keeping transmission quality, and performing intermittence reception without fail. A wireless communication management device includes and transmits beacon time period information in a main beacon and a sub beacon. Then, a wireless terminal device divides transmission data based on the beacon time period information so that the transmission of the transmission data is finished before the transmission of a main beacon is started. Thereby, overlap of transmission timings of the beacon and the transmission data can be prevented and the beacon interval can be made fixed. This can keep transmission quality, makes the wireless terminal device to perform intermittence reception without fail, and improve the entire data transmission efficiency of the system.

Provided are a beacon scheduling system and method for preventing beacon overlapping in a ZigBee network including routers each with a beacon slot number according to a specific time slot. The system includes: a first router periodically transmitting beacons at a beacon interval according to a specific time slot; and a second router finding the beacon interval by scanning the beacons transmitted by the first router and transmitting beacons within the beacon interval in consideration of a superframe period for transmitting data. When a router in a sensor network operates, the router can efficiently select the beacon transmission time, and a sink node manages beacon overlapping between all the routers. Therefore, stable, low-energy consumption, and excellent performance sensor networking environments can be established in a beacon mode.

A method and system for managing power consumption in a portable computing device having a network interface module is presented. A power management module receives inputs from other modules and determines when the network interface module is to be put in a doze state for a predetermined number of beacon intervals to conserve power consumption in the network interface module. The network interface module in a device that is associated with a network is put in the doze state after an event has occurred including when a scan has been performed, after a delayed sleep timer has expired, and after a beacon transmission has been completed and no traffic is buffered for the device. The delayed sleep time is set based on the estimated round trip time of a packet.

A communications system includes a plurality of Time Division Multiple Access (TDMA) mesh networks formed by a plurality of wireless nodes. Each plurality of wireless nodes within a respective TDMA mesh network comprises a transmitter and receiver that communicate on a primary and optionally at least one secondary frequency and use a TDMA epoch that is divided into at least a beacon interval using the primary frequency and a digital data interval using the primary and secondary frequencies. The wireless nodes are synchronized to each other such that the start of TDMA epochs for each TDMA mesh network overlap and have the same TDMA epoch duration or an integer multiple thereof.

Disclosed is a method for switching at least one wireless node located within the coverage of a basic service set (BSS) or an basic basic service set (IBSS) from a first communication channel to a second communication channel in a wireless local area network (WLAN). methods and systems. In one embodiment, the method includes the following steps: determining whether a second communication channel to be used by at least one wireless node is required; when it is determined that the second communication channel is required, broadcasting a management frame by the source node to the at least one wireless node, the The management frame includes a channel switching time and a second communication channel identifier; and switching at least one wireless node that receives the management frame from the first communication channel to the second communication channel within a countdown time corresponding to the channel switching time, The channel switching time is less than the beacon interval. In an alternative embodiment, the method includes the steps of: determining whether a second communication channel to be used by at least one wireless node is required; and when it is determined that the second communication channel is required, broadcasting, by the source node, a first management frame to the at least one wireless node , the first management frame includes the channel switching time and the second communication channel identifier; and upon receiving the broadcast first management frame on the at least one wireless node, suspending all further frame exchanges in the first communication channel to mute the second communication channel. A communication channel.

A method for transmitting a flooding ad hoc traffic indication message (FATIM) in a power save mode whose beacon interval is divided into an ad hoc traffic indication message (ATIM) window and data transmission window subsequent to the ATIM window, in a mobile ad hoc network (MANET) constituted by a plurality of nodes. When one of the plurality of nodes has data to be forwarded to different nodes, a FATIM frame indicating that a network broadcast message will be sent to its neighbor nodes is forwarded during the ATIM window. If a current ATIM window has not expired, at least one different node of the plurality of nodes receiving the FATIM frame forwards the received FATIM frame to its neighbor nodes.

The present invention is to provide each communication station with a transmission prioritised period without any useless latency in an ad-hoc communication environment including no control station. For this end, each communication station periodically transmits the beacon signal and acquires the transmission prioritised period immediately after transmission of the beacon. If the number of communication stations in the network is small, a communication station transmit a supplementary beacon within the super frame period, thereby effectively shortening the beacon interval and reducing latency at the start of transmission. At the time when a new communication station enters the network, the supplementary beacon is released in order to accommodate such new communication station.