Patent application number | Description | Published |
20080205340 | NEIGHBOR DISCOVERY IN A WIRELESS SYSTEM - Beacons may be grouped to facilitate neighbor discovery in a wireless network. For example, neighboring access devices such as IEEE 802.11 access points may cooperate to transmit beacons in a group. In this way, a wireless device seeking to discover the neighboring access devices may scan for the beacons for a shorter period of time. An indication may be provided to enable a wireless device to more efficiently scan the beacons. For example, the indication may indicate the channel the wireless device should scan to receive the next beacon that is to be transmitted. In addition, the indication may include information relating to the transmission time of the next beacon. | 08-28-2008 |
20090154372 | METHOD AND APPARATUS FOR RESOLVING BLINDED-NODE PROBLEMS IN WIRELESS NETWORKS - Techniques for resolving blinded-node problems are described herein. One aspect operates on the physical (PHY) layer only, which a second layer operates on the medium access control (MAC) layer. Both aspects involve having a node stop processing a data packet that is not destined for it so as to be able to reserve its resources to detect control and other packets. An apparatus for implementing the techniques are also disclosed. | 06-18-2009 |
20090191817 | Adaptive transmission of resource utilization messages based on throughput - An adaptive scheme controls the transmission of interference management messages by wireless nodes. For example, the adaptive scheme may be used to determine whether and/or how to transmit resource utilization messages. Such a determination may be based on, for example, comparison of a quality of service threshold with a current quality of service level associated with received data. A quality of service threshold may be adapted based on the effect of previously transmitted resource utilization messages. A quality of service threshold for a given wireless node may be adapted based on the frequency at which the wireless node transmits resource utilization messages. A quality of service threshold for a given wireless node may be adapted based on information received from another wireless node. An adaptation scheme also may depend on the type of traffic received by a given wireless node. A quality of service threshold also may be adapted based on throughput information. | 07-30-2009 |
20090203385 | SECTOR INTERFERENCE MANAGEMENT BASED ON INTER-SECTOR PERFORMANCE - Providing fairness-based metrics for managing inter-sector interference of a mobile AN is described herein. By way of example, accumulation of resource utilization messages (RUMs) at a sector of the mobile AN can be based at least in part on a performance metric of that sector as compared with one or more neighboring sectors. In at least one aspect, performance metrics of multiple sectors of the mobile AN can be aggregated and a RUM accumulation rate of each sector is determined based on the aggregated metric. Accumulation rates can further be updated periodically as sector and/or aggregated metrics of the mobile AN change. Accordingly, accumulation and utilization of RUMs is based on inter-sector fairness to optimize overall wireless communication quality of service for the mobile AN. | 08-13-2009 |
20090219851 | ADDING HYBRID ARQ TO WLAN PROTOCOLS WITH MAC BASED FEEDBACK - A wireless node having a MAC layer configured to coordinate access to a shared wireless medium using a MAC protocol, a PHY layer configured to provide an interface to the shared wireless medium, and a HARQ layer between the MAC and PHY layers, the HARQ layer being configured to support HARQ using the MAC protocol. | 09-03-2009 |
20090245182 | ADAPTIVELY REACTING TO RESOURCE UTILIZATION MESSAGES INCLUDING CHANNEL GAIN INDICATION - An adaptable decision parameter is used to determine whether to react to resource utilization messages. The decision parameter may comprise a decision threshold that is adapted based on received resource utilization messages. The decision parameter may comprise a probability that is used to determine whether to react to a received resource utilization message. Such a probability may be based on, for example, one or more channel conditions, the number of interferers seen by a node, the number of received resource utilization messages, or some other form of resource utilization message-related information. | 10-01-2009 |
20090247177 | ADAPTING DECISION PARAMETER FOR REACTING TO RESOURCE UTILIZATION MESSAGES - An adaptable decision parameter is used to determine whether to react to resource utilization messages. The decision parameter may comprise a decision threshold that is adapted based on received resource utilization messages. The decision parameter may comprise a probability that is used to determine whether to react to a received resource utilization message. Such a probability may be based on, for example, one or more channel conditions, the number of interferers seen by a node, the number of received resource utilization messages, or some other form of resource utilization message-related information. | 10-01-2009 |
20090286481 | DYNAMIC INTERFERENCE MANAGEMENT FOR WIRELESS NETWORKS - Methods and apparatuses for dynamic interference management for wireless networks are disclosed. A node in a wireless network is configured to determine whether to cease transmissions during a period of time designated for a first node to transmit to a second node based on at least parameter relating to a channel between the first and second nodes. | 11-19-2009 |
20090290655 | TRANSMISSION MODE AND RATE SELECTION FOR A WIRELESS COMMUNICATION SYSTEM - To select a transmission mode to use for a data transmission via a MIMO channel from station A to station B, station A obtains channel information used for spatial processing and determines the age of this information. Station A selects one of multiple transmission modes based on the age of the channel information and possibly other information (e.g., the fading characteristic of the MIMO channel). To select rate(s) to use for the data transmission, station A obtains channel state information (CSI) indicative of the received signal quality for the MIMO channel, e.g., received SNRs or “initial” rates. Station A determines the age of the CSI and selects one or more “final” rates based on the CSI, the age of the CSI, the selected transmission mode, and possibly other information. Station A processes data in accordance with the selected transmission mode and final rate(s) and transmits the processed data to station B. | 11-26-2009 |
20100040158 | EMBEDDING INFORMATION IN AN 802.11 SIGNAL FIELD - Techniques and apparatus for embedding one or more bits of 802.11 Very High Throughput (VHT) information in existing IEEE 802.11 preamble fields are provided. As will be described herein, because different combinations of modulation techniques, coding schemes, and transmission lengths result in the same transmit time (e.g., in terms of symbol length), a clever choice of modulation, coding, and length may allow some extra information to be embedded in a legacy field for use by VHT stations. In this manner, the total VHT preamble transmission time may potentially be reduced, thereby increasing the efficiency of the physical layer (PHY). Moreover, the embedded bits may most likely be invisible to legacy stations, since the transmission time that such stations compute will be independent of these bits by design. | 02-18-2010 |
20100046367 | POWER AND RESOURCE EFFICIENT APPDU BASED APPROACH WITH SCHEDULED DATA TRANSMISSION TIMES FOR WLAN - Disclosed are methods and apparatuses for communications by which a physical layer packet is generated for transmission to a node, or by which a physical layer packet is received from a node, the physical layer packet having a plurality of MAC packets, wherein the physical layer packet includes a transmission schedule associated with the plurality of MAC packets in the physical layer packet. | 02-25-2010 |
20100046441 | POWER AND RESOURCE EFFICIENT APPDU BASED APPROACH WITH SCHEDULED BLOCK ACKS FOR WLAN - Disclosed are methods and apparatuses for communications by which a data packet is generated for transmission to a node, or by which a data packet is received from a node, the data packet including a header and data, wherein a channel designation for a node to send an acknowledgement to an apparatus or a transmitting node is embedded in the header of the data packet. | 02-25-2010 |
20100046479 | POWER CONTROL FOR WIRELESS LAN STATIONS - Techniques and apparatus for controlling the transmit power of an uplink (UL) signal from a user terminal in a wireless communications system in an effort to achieve some target characteristic, such as a target carrier-to-interference (C/I) ratio, at an access point (AP) are provided. In this manner, such a user terminal may help avoid or compensate for imbalances in received radio frequency (RF) power between UL signals received from multiple user terminals by the AP. For example, the transmit power at each user terminal may be controlled in an effort to achieve a target post-processing C/I ratio of 28 dB per spatial stream in an effort to reduce large power imbalances and optimize throughput per user terminal. The user terminal and the AP may compose part of a multiple-input multiple-output (MIMO) communication system utilizing spatial-division multiple access (SDMA) techniques. | 02-25-2010 |
20100046485 | METHOD AND APPARATUS FOR MULTIPLE CHANNEL ACCESS AND NAV RECOVERY - An apparatus and method for communications are disclosed. The apparatus may include a processing system configured to send data to a node on a first channel and receive an acknowledgement to the data from the node, the processing system being further configured to determine whether a second channel is available from information contained in the acknowledgement. | 02-25-2010 |
20100150038 | APPARATUS AND METHOD FOR WIRELESS COMMUNICATION VIA AT LEAST ONE OF DIRECTIONAL AND OMNI-DIRECTION ANTENNAS - Techniques for using at least one of omni-directional and directional antennas for communication are described. A station may be equipped antenna elements selectable for use as an omni-directional antenna or one or more directional antennas. The station may select the omni-directional antenna or a directional antenna for use for communication based on various factors such as, e.g., whether the location or direction of a target station for communication is known, whether control frames or data frames are being exchanged, etc. | 06-17-2010 |
20100150077 | APPARATUS AND METHOD FOR WIRELESS COMMUNICATION VIA AT LEAST ONE OF DIRECTIONAL AND OMNI-DIRECTION ANTENNAS - Techniques for using at least one of omni-directional and directional antennas for communication are described. A station may be equipped antenna elements selectable for use as an omni-directional antenna or one or more directional antennas. The station may select the omni-directional antenna or a directional antenna for use for communication based on various factors such as, e.g., whether the location or direction of a target station for communication is known, whether control frames or data frames are being exchanged, etc. | 06-17-2010 |
20100238912 | SIGNALING METHODS FOR MMSE PRECODING WITH EIGENMODE SELECTION - Different methods of signaling between an access point and user terminals in a multiuser wireless system for performing a minimum mean square error (MMSE) precoding at the access point preceded with eigenmode selection are provided. For one embodiment of the present disclosure, a compact feedback may be utilized between a plurality of user terminals and the access point. For another embodiment of the present disclosure, a hybrid feedback may be utilized between the plurality of user terminals and the access point. For yet another embodiment of the present disclosure, a full feedback may be utilized between the plurality of user terminals and the access point. | 09-23-2010 |
20100260060 | INTEGRATED CALIBRATION PROTOCOL FOR WIRELESS LANS - Certain aspects of the present disclosure provide a protocol for calibration of an access point in a wireless network. | 10-14-2010 |
20130157578 | APPARATUS AND METHOD FOR WIRELESS COMMUNICATION VIA AT LEAST ONE OF DIRECTIONAL AND OMNI-DIRECTION ANTENNAS - Techniques for using at least one of omni-directional and directional antennas for communication are described. A station may be equipped antenna elements selectable for use as an omni-directional antenna or one or more directional antennas. The station may select the omni-directional antenna or a directional antenna for use for communication based on various factors such as, e.g., whether the location or direction of a target station for communication is known, whether control frames or data frames are being exchanged, etc. | 06-20-2013 |
20130188621 | NEIGHBOR DISCOVERY IN A WIRELESS SYSTEM - Beacons may be grouped to facilitate neighbor discovery in a wireless network. For example, neighboring access devices such as IEEE 802.11 access points may cooperate to transmit beacons in a group. In this way, a wireless device seeking to discover the neighboring access devices may scan for the beacons for a shorter period of time. An indication may be provided to enable a wireless device to more efficiently scan the beacons. For example, the indication may indicate the channel the wireless device should scan to receive the next beacon that is to be transmitted. In addition, the indication may include information relating to the transmission time of the next beacon. Other aspects, embodiments, and features are also claimed and described. | 07-25-2013 |
20140078992 | SECTOR INTERFERENCE MANAGEMENT BASED ON INTER-SECTOR PERFORMANCE - Providing fairness-based metrics for managing inter-sector interference of a mobile AN is described herein. By way of example, accumulation of resource utilization messages (RUMs) at a sector of the mobile AN can be based at least in part on a performance metric of that sector as compared with one or more neighboring sectors. In at least one aspect, performance metrics of multiple sectors of the mobile AN can be aggregated and a RUM accumulation rate of each sector is determined based on the aggregated metric. Accumulation rates can further be updated periodically as sector and/or aggregated metrics of the mobile AN change. Accordingly, accumulation and utilization of RUMs is based on inter-sector fairness to optimize overall wireless communication quality of service for the mobile AN. | 03-20-2014 |