Aruba Networks, Inc.

Hewlett-packard Development Company, L.p.

Hewlett Packard Enterprise Development LP

Colubris Networks, Inc.

Subburajan Ponnuswamy

Patrick A Worfolk

Shimon B Scherzer

Armin D Haken

Ronen Vainish

Dongwoon Hahn

James W Jervis

Ahmed Khidre

Pradeep Iyer

Neal Dante Castagnoli

According to one embodiment of the disclosure, a non-transitory computer-readable medium comprising instructions which, when executed by one or more hardware processors, causes performance of operations. One of these operations comprises transmitting, from a first device to a second device, a first plurality of frames using a first polarization configuration for a first antenna corresponding to the first device. Based on feedback information associated with the first plurality of frames, a second polarization configuration, which is different than the first polarization configuration, is selected for transmitting a second plurality of frames. Thereafter, the second plurality of frames is transmitted from the first device to the second device using the second polarization configuration for the first antenna.

System, apparatus and method for wireless link management for a multi-polarized antenna system

The present disclosure discloses a method and system for adaptive cell size management. The system can determine a minimum SNR value and one or more current environmental factors for a particular environment. Also, the system dynamically determines a minimum signal strength value for receiving wireless signals based on the minimum SNR value and the one or more current environmental factors, and configures a network device to receive signals with the minimum signal strength value. Alternatively, the system can estimate a particular coverage area such that a first set of wireless signals transmitted by devices located within the particular coverage area reach a network device at a minimum signal strength. The system then computes a transmission power such that a second set of wireless signals transmitted by the network device at the transmission power reaches an edge of the particular coverage area at a particular signal strength value.

Method and system for adaptive cell size management

Disclosed is a system, apparatus, and method for RF management using network-device-to-network-device channel estimation and standard beamforming techniques. The exemplary method comprises: obtaining a first information corresponding to a first device that is a target device for transmitting at least one of a plurality of wireless signals by a network device; obtaining a second information corresponding to a second device that is to be avoided by propagation of any wireless signals transmitted by the network device; computing a radiation pattern for transmitting the plurality of wireless signals based at least on the first information associated with the first device and the second information associated with the second device; and transmitting the plurality of wireless signals based on the radiation pattern.

Method for RF management, frequency reuse and increasing overall system capacity using network-device-to-network-device channel estimation and standard beamforming techniques

System, apparatus and method for intergrated wireless link management for a multi-polarized antenna system

Disclosed herein is a system, apparatus, and method for optimizing sounding and feedback overhead in a wireless digital network utilizing a beamforming technique by adaptively changing the frequency of sounding transmissions. The exemplary method comprises: transmitting a first plurality of sounding frames based on a first sounding interval, wherein the first sounding interval is a first period of time between transmissions of two sounding frames in the first plurality of sounding frames; receiving a plurality of feedback frames comprising information associated with the first plurality of sounding frames; based on the plurality of feedback frames: selecting a second sounding interval, different than the first sounding interval, for transmitting a second plurality of sounding frames; and transmitting the second plurality of sounding frames based on the second sounding interval, wherein the second sounding interval is a second period of time between transmissions of two sounding frames in the second plurality of sounding frames.

Adaptive methods for optimizing sounding and channel feedback overhead in SU-MIMO and MU-MIMO beam forming

Disclosed herein, one embodiment of the disclosure is directed to a system, apparatus, and method for location estimation in the presence of multipath/non-line-of-sight (NLOS) conditions. Various methods have been contemplated to detect the level of multipath/NLOS propagation between two devices. A SNR variation method determines how the SNR of each chain/stream is varying over a time window in order to detect the chain/stream with least local scattering or multipath. A measure of coherence SNR is defined to measure the level of multipath/NLOS per-chain/stream. Moreover, since per-subcarrier SNR information is available at the one or both nodes, the coherence methods can be used on a per-subcarrier basis to detect multipath/NLOS for the entire channel, for the specific spatial stream or for the specific frequencies occupied by the subcarriers. Furthermore, a coherence bandwidth estimation method uses the SNR variation over subcarriers to detect the coherence bandwidth of the spatial stream. The amount of multipath/NLOS is inversely proportional to the coherence bandwidth.

System and methods for location determination in MIMO wireless networks

According to one embodiment of the invention, a non-transitory computer readable medium for configuring a noise floor of a network device based on the detection of a non-Wi-Fi signal is described. One embodiment of the non-transitory computer readable medium comprises instructions that detect a non-Wi-Fi signal, determine a noise floor based on at least one attribute of the non-Wi-Fi signal and configure the noise floor of the network device such that the network device receives signals with a signal strength above the noise floor value.

Mitigating interference in wireless systems

Disclosed herein is a system, apparatus, and method for using an antenna system comprising individually configurable antenna circuitries in a wireless network device to simulate the standard MU-MIMO transmissions as specified in the IEEE 802.11ac standard with antenna beamforming. The individually configurable antenna circuitries can be configured to transmit radio frequency (RF) signals with specific radiation patterns including directional beam patterns. Client devices may be grouped and antenna circuitries may be configured in such a way as to minimize inter-user interference. Frequent sounding-channel state feedback cycles and associated overhead are obviated with antenna beamforming, and no change to standard-compliant client devices is necessary. A better overall performance compared to MU-MIMO based on DSP-based beamforming as specified in the IEEE 802.11ac standard is expected.

MU-MIMO implementation with configurable antenna system

Methods of operating devices on a wireless network as access points (AP) or spectrum monitors (SM). An adaptive radio management (ARM) process operating on the digital network senses network conditions based on data from APs and SMs on the network, and in response to conditions changes devices from AP operation to SM operation, and from SM operation back to AP operation. A method for providing wideband spectrum analysis functions on a radio operating as an AP on a channel proving client connectivity services. A method for scanning off-channel for shorter durations between transmissions to collect spectral data and a method for explicitly quieting IEEE 802.11 transmissions on a channel to collect spectral data.

Spectrum-aware RF management and automatic conversion of access points to spectrum monitors and hybrid mode access points

According to one embodiment of the invention, a network device comprises a plurality of antennas comprising a first antenna, wherein the first antenna comprises: a first set of one or more elements that form an Alford loop and that is configured for electrical excitation via a current transmitted over a conductive medium from a signal source and a second set of one or more elements that is configured for electromagnetic induction without contact with the conductive medium from the signal source.

Alford loop antennas with parasitic elements

A combination and correlation of data from multiple sensors in a wireless digital network is described. Sensors such as spectrum monitors, access points, and wireless client devices provide spectrum data to one or more central stations connected to the network. Spectrum data from multiple sensors is combined and correlated to provide insight into network operation such as spectrum maps, detection-range maps, and for network diagnostics. Sensors providing spectrum data may be synchronized. Correlating spectrum data from synchronized sensors allows more accurate location of sources such as interferers. The known EIRP of certain wireless devices may be used to improve location estimates, and these devices may be used as calibrations sources for sensors in the wireless network.

Correlating data from multiple spectrum monitors

Antenna designs

Disclosed herein, one embodiment of the disclosure is directed to a system, apparatus, and method for grouping client devices for simultaneous MU-MIMO transmissions. When client devices are being grouped for simultaneous MU-MIMO transmissions, a first wireless network device may obtain information corresponding to a plurality of client devices that are associated with the first wireless network device. This information may correspond to signals received from one or more of the client devices by each of the wireless network devices other than the first wireless network device. Then, a subset of the client devices may be selected for concurrent communications based, at least in part, on the information corresponding to the plurality of client devices for concurrent communication. Thereafter, the subset of client devices, referred to as the first group, may be concurrently communicated with.

Methods for group management, scheduling, and rate selection for MU-MIMO using user location and other system parameters

System and methods for information collection and processing for location estimation in MIMO wireless networks

Disclosed herein is a system, apparatus, and method for adaptive per-user multipath control for spatial multiplexing gain in MIMO systems. Transmission parameters relating to Cyclic Shifts and/or Radio Frequency (RF) antenna beams are modified and tested to find optimal transmission parameters that enable better exploitation of multipath RF propagation and therefore better spatial multiplexing gain.

Growing community of inventors

Saratoga, CA, United States of America

Subburajan Ponnuswamy