Abstract: A method of providing rate adaptation in a multi-user wireless communication system including single-user beamforming (SU-BF) and multi-user multiple-input multiple-output (MU-MIMO) is described. In this method, a master rate, which is a modulation and coding scheme (MCS) for the SU-BF, is determined. An MCS for each transmit mode is derived from the master rate using a rate mapping. Using the results from the mapping, the master rate, instead of the MCS for each transmit mode, is tracked. In one embodiment, a mapping calibration is periodically performed.

Abstract: An access point may transmit, to a first wireless device, a message indicating a busy period of the access point. The busy period is a time during which the access point will perform wireless operations with at least a second wireless device different from the first wireless device. During the busy period, the access point may refrain from transmitting from the access point to the first wireless device. The message indicating the busy period may include a duration of the busy period. The message indicating the busy period may be included in a portion of a data transmission to the first wireless device. The first wireless device may enter a low power mode (e.g., sleep operating state) responsive to the busy period.

Abstract: An apparatus that employs a directional antenna system updates a beam pattern table that includes entries corresponding to each of the other apparatuses with which the apparatus communicates. For example, for each of the other apparatuses, the beam pattern table may specify the antenna weights to be used to provide a quasi-omni-directional beam pattern, a sector level beam pattern, and a refined beam pattern when communicating with that other apparatus. In some aspects, the beam pattern table includes one or more characteristics associated with each of the beam patterns. These characteristics may be used in conjunction with a beam search criterion to trigger updating of the beam pattern table.

Abstract: In adaptive modulation and coding scheme (MCS) selection for directional antenna systems, at least one table is defined that maps different ranges of signal quality values to different sets of MCS parameters. In some implementations, each range corresponds to a separate table (e.g., a given table will include the MCS and other information for that range of signal quality values). In the event an abrupt change in signal quality is detected (e.g., a change in received signal strength greater than or equal to a defined threshold), instead of using a conventional rate selection algorithm, a new MCS is selected through the use of the ranges from the table(s). In this way, a relatively large change in MCS may be accommodated, if warranted by the change in signal quality.

Abstract: Various aspects of the disclosure described herein provide for optimizing rate control during a selection of a communications profile from a set of communications profiles by taking into account effective frame aggregation size as a function of packet error rate (PER). An expected throughput may also be determined for each communications profile and updated after each transmission so that a communications profile having the highest expected throughput may be chosen for a particular frame transmission.

Abstract: Methods, systems, and devices are described for power conservation in a wireless communications system. In embodiments, power conservation may be achieved by adaptively controlling power modes of a wireless communication device, using a modulation and coding scheme (MCS) value as a factor for guidance. According to one aspect, the device may be in a reception mode. While in a first power mode, the device may receive control information for incoming data that is being transmitted via a transmission frame. The control information may be located in a first portion of the frame with the data following in a second portion of the frame. The control information may include or otherwise indicate an MCS value corresponding to the MCS applied to the incoming data. Based on the MCS value, the device may be adaptively switched to a second power mode for receiving the incoming data.

Abstract: Methods, systems, and devices are described for power conservation in a wireless communications system. In embodiments, power conservation may be achieved by adaptively controlling power modes of a wireless communication device, and implementing lower power modes with various modes of the device. According to one aspect, the mode of the device may be a beacon monitoring mode or a delivery traffic indication message (DTIM) mode. In such a mode, the device may receive a portion of a beacon in a first power mode. The device may transition to a second, different (e.g., higher) power mode using information contained in the received portion of the beacon as guidance.

Abstract: A wake-up radio is configured to scan for transmissions while the radio receiver is in sleep mode. The wake-up radio detects incoming RF transmissions intended for the radio receiver by analyzing data frame characteristics in an incoming RF transmission. The data frame characteristics may contain a signature code that is unique to the radio receiver. The signature code may be based on the time duration of a sequence of orthogonal frequency division multiplex (OFDM) symbols received in a clear to send to self (CTS2S) transmission or a time duration of short interframe spaces (SIFS) used to transmit the data frames.

Abstract: A method of providing feedback on channel observations to a transmitter includes observing a channel at a receiver based on received signals from the transmitter and determining whether a packet error rate (PER) is rising based on the observing. The receiver determines whether a rising PER is caused by channel noise or interference, and transmits a message to the transmitter indicating the cause of the rising PER. The cause may be encoded in reserved bits of a block acknowledgement (BA) frame or an Acknowledge (ACK) frame, or in a modulation coding scheme (MCS) used to transmit the message. The cause may be detected in response to SNR/RSSI level of received signals, or a number of receiver restarts. The transmitter may change the transmit rate adaptation algorithm to use a lower MCS if channel noise causes the rising PER, and a higher MCS if interference causes the rising PER.

Abstract: The disclosure relates to systems and methods for controlling a delay probability distribution associated with receiving a response to a page. The method entails performing a series of page operations, wherein each page operation entails transmitting a page and scanning for a page response. The method further entails adjusting at least one timing parameter associated with performing the series of page operations based on a characteristic of one or more scans for the page performed by the at least one remote device. The characteristic may be the period of periodic page scans performed by the at least one remote device.

Abstract: Various aspects of apparatus for accessing a network through a wireless access point and methods of power savings for such apparatus include scheduling a sleep state interval, entering a sleep state at the beginning of the scheduled sleep interval, and buffering data during the sleep state for transmission following the sleep state.

Abstract: A wireless device is configured to switch data rates to account for temporary channel conditions or device configuration errors. Pre-selected data rates, more likely to achieve maximum goodput, are stored in a data rate table. The data rate table contains candidate data rates for each pre-selected data rate in the data rate table. When probe transmissions using the preselected data rates fail, dynamic rate probing is utilized to determine a possible cause and extent of the problem. The dynamic rate probing scheme transmits probe transmissions using the candidate data rates and tracks success or failure of these probe transmissions. An analysis of the probe transmissions is used to indicate a possible cause and/or extent of the problematic condition and to determine whether there is a need to reconfigure the data rates in the data rate table.

Abstract: The disclosure is directed to a wireless communications device. In an embodiment, the wireless communications device comprises a phased antenna array comprising a plurality of antennas, a transceiver operatively coupled to the phased antenna array and configured to control the plurality of antennas and an antenna weight vector (AWV), a memory storing a spherical zoning map, and a beam controller configured to control the transceiver by setting the AWV for each antenna of the plurality of antennas.

Abstract: Media access control is provided for an ultra-wide band medium. The media access control may employ a peer-to-peer network topology. The media access control may employ a reduced addressing scheme. Concurrent ultra-wide band channels may be established through the use of a pulse division multiple access channelization scheme. Multiple media access control states may be defined whereby each state may be associated with one or more of different channel parameter state information, different duty cycles, and different synchronization status.

Abstract: Various aspects of apparatus for accessing a network through a wireless access point and methods of power savings for such apparatus include operating in a sleep state, and scheduling one or more sleep state intervals for operating in the sleep state during a time period, wherein the scheduled one or more sleep state intervals are based on one or more wireless transmission parameters.

Abstract: An apparatus and method for wireless communications configured to receive simultaneous transmissions from a plurality of wireless devices, with each of the transmissions having a reference signal, acquire the reference signals and, based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding.

Abstract: A method of providing aggregated MAC protocol data unit (AMPDU) duration control in a wireless communication device includes setting an AMPDU duration. Pass/fail statistics are collected for each MPDU of an AMPDU in a time window, W. A packet error rate (PER) difference is calculated between first and last sets of MPDUs for each AMPDU in the window. An average PER difference is calculated across all AMPDUs in the window. When the average PER difference is greater than a first threshold, then the AMPDU duration is decreased. When the difference is less than a second threshold, then the AMPDU duration is increased. When the difference is within the first and the second thresholds, then the method returns to the step of collecting for a next time window. The AMPDU duration can also be adjusted based on detected Doppler and line-of-sight transmissions.

Abstract: A method of performing dual-mode rate control for an access point in a wireless communication system includes a single-user mode of operation and a multi-user mode of operation. In the single-user mode, a basic rate for a station is determined based on channel conditions. In the multi-user mode, a rate for a plurality of stations is determined using tracking. The tracking includes performing a sounding for the plurality of stations. An initial multi-user current rate is then set equal to a function of a number of users and the basic rate. A transmission is sent to the plurality of stations using the current rate. A packet error rate (PER) is detected during transmission to the plurality of stations. The current rate is adjusted based on the PER. After rate adjustment, either sounding is triggered or the method returns to sending a transmission using the current rate.

Abstract: Disclosed is a method for address privacy protection for a first wireless device sharing a privacy key with a second wireless device. In the method, a first resolution tag is generated at the first wireless device using a pseudo-random function with the seed value and the privacy key as input arguments. The privacy key is only known to the first and second wireless devices. A privacy address is generated for the first wireless device based on the seed value and the first resolution tag. A packet is transmitted from the first wireless device to the second wireless device. The packet includes the privacy address and the first resolution tag.

Abstract: An access point may transmit, to a first wireless device, a message indicating a busy period of the access point. The busy period is a time during which the access point will perform wireless operations with at least a second wireless device different from the first wireless device. During the busy period, the access point may refrain from transmitting from the access point to the first wireless device. The message indicating the busy period may include a duration of the busy period. The message indicating the busy period may be included in a portion of a data transmission to the first wireless device. The first wireless device may enter a low power mode (e.g., sleep operating state) responsive to the busy period.