Magnolia Broadband Inc.

Google Inc.

Magnotod LLC

Kenneth Kludt

Haim Harel

Phil Chen

Sherwin J Wang

Eduardo Abreu

Stuart Sanders Jeffery

Yair Karmi

Thorp Rivingston

Wei Sun

Phil Fu-Wei Chen

Amos Baron

Wai Hon Lo

Dilek Barlas

Phil F Chen

Systems and methods of scheduling data for transmission from an access point 'AP' to a station in a system of multiple co-located APs may include determining whether the station is also able to receive transmitted data from another of the multiple co-located APs. If the determining is negative the data is transmitted but if the determination is positive, the data may be transmitted only after ascertaining that exclusive permission to transmit the data to the station has been granted to the AP.

System and method for cooperative scheduling for co-located access points

A method and apparatus has been developed to reduce SAR for a mobile device by designing appropriate matching circuits between each antenna and its power amplifier. In the presence of such matching circuits the normal phase adjustments may be carried out to provide a preferred safe SAR level that can be maintained during phase adjustment without sacrificing TRP.

Controlling MTD antenna VSWR and coupling for SAR control

A wireless communication system may include a plurality of co-located transceivers. The plurality of transceivers may be configured to transmit data to at least one user equipment, according to a collision sense multiple access/collision avoidance (CSMA/CA) protocol. A processor may receive a signal preamble and a sender address of the signal preamble and determine whether the sender address is included in the stored list of addresses. If the sender address is included in the stored list of addresses, the processor may allow simultaneous data transmission from two or more of the co-located transceivers.

System and method for co-located and co-channel Wi-Fi access points

A system and method for providing multi-beam Wi-Fi access points. The system includes one or more Wi-Fi transmit antennas beamformers; one or more Wi-Fi receive antennas or receive beamformers; and a number N of co-channel Wi-Fi access points (APs) and a number of M non co-channel APS, where all APs comply with IEEE802.11xx standard, connected to the Wi-Fi transmit antennas beamformers, wherein the Wi-Fi transmit antennas beamformers are configured to produce a plurality of non spatially adjacent beams of a common frequency, directed at a plurality of Wi-Fi user equipment (UE) such that the directional beams are sufficiently isolated from each other, and at least some of the Wi-Fi UEs communicate simultaneously with the plurality of Wi-Fi access points.

Multi-beam co-channel Wi-Fi access point

In a cell phone telecommunication system having a macrocell and a small cell coextensive with or adjacent to the macrocell and sharing a common frequency band, interference can occur between a user device operating in the small cell, the local base station operating the user devices in the small cell on one hand and another user device serviced by a main base station for the macrocell. In order to reduce this interference, the shape of the transmission beam from at least one of the user devices or base stations is shaped into a narrow beam steered to be directed at the respective receiving unit. Alternatively, the shape of the transmission beam has a null point and the beam is steered so that its null point is directed toward the affected unit.

Method and apparatus for adaptive reduction of interference in a small cell of a mobile telecommunication system

A system for selecting optimal phase combinations for RF beamformers in a MIMO hybrid receiving systems augmented by RF Distribution Network. The system addresses the issue of providing beamforming gains for a plurality of layers using one common set of weights for each beamformer. The specification may be based on channel estimation of all layers as viewed by all receiving antennas, and maximizing metrics that capture the total received power.

Beamformer phase optimization for a multi-layer MIMO system augmented by radio distribution network

A system and method may include a plurality of transmit and receive antennas covering one sector of a cellular communication base station; a multi-beam RF beamforming matrix connected to the transmit and receive antennas; a plurality of radio circuitries connected to the multi-beam RF beamforming matrix; and a baseband module connected to the radio circuitries. The multi-beam RF beamforming matrix may be configured to generate one sector beam and two or more directional co-frequency beams pointed at user equipment (UEs) within the sector, as instructed by the baseband module. A number M denotes the number the directional beams and a number N denotes the number of the radio circuitries and wherein M&#x3e;N.

Multi-beam MIMO time division duplex base station using subset of radios

A system and method for selective registration of a user equipment (UE) to one of a plurality of access points (APs). An indication may be received that each of a plurality of APs have received a signal from a UE. The UE may be registered to the first one of the plurality of APs to satisfy registration requirements associated with the UE. Information may be reported to a controller related to the signal strength of communication received at each AP from the UE. If the signal strength received at the registered AP is less than the signal strength received at one or more of the non-registered APs by more than a threshold amount, the registration of the UE to the registered AP may be rejected.

System and method for selective registration in a multi-beam system

A system and method for overriding Carrier-Sense-Multiple-Access/Collision-Avoidance (CSMA/CA) and virtual carrier sense, without harming the traffic that occupies the channel is described herein. Further provided herein are measurements and qualifying criteria for performing the aforementioned channel sharing. The system and method may be based, for example, on opportunistic spatial isolation of nodes from each other and selectively implementing ultra-fast link adaptation.

System and method for simultaneous co-channel access of neighboring access points

A system that implements multi user multiple inputs multiple outputs (MU MIMO) base station using a plurality of co-located single-user (SU) MIMO base stations is provided herein. The system may include a number N co-located single-user multiple input multiple output (SU-MIMO) bases stations each having a number K MIMO rank, wherein said N co-located SU-MIMO base stations are configured to share a common antennas array, operating over a common frequency band; a front-end MIMO processor connected to said N co-located SU-MIMO base stations and further coupleable to said common antennas array; and a back-end coordinator configured to collaboratively assist in optimizing operation of said N co-located SU-MIMO base stations, such that said N co-located SU-MIMO base stations and said front-end MIMO processor collaboratively implement a multi-user multiple input multiple output (MU-MIMO) base station capable of dynamically separating a coverage area into N*K spatial channels.

Implementing multi user multiple input multiple output (MU MIMO) base station using single-user (SU) MIMO co-located base stations

A method and system for calibrating transmit and receive antenna patterns for time division duplex (TDD) is described. A station in a communications network comprises at least two antennas configured to operate together for both transmitting and receiving modes. A phase setting difference between the transmit and receive antenna patterns may be determined and used to determine a relative amplitude setting for the transmit antenna pattern and/or a relative amplitude setting for the receive antenna pattern.

System and method for transmit and receive antenna patterns calibration for time division duplex (TDD) systems

A system and method for backhaul based explicit sounding feedback of 802.11 AP to AP channel state information (CSI) so that inter AP interference can be reduced and multiple APs transmissions that can occur simultaneously on the same radio channel. A modification may be made to APs such that they can accurately measure the CSI between them that in turn enables their respective beamformer to create pattern nulls toward each other while simultaneously developing pattern enhancements toward their intended station. An AP may send a sounding packet to its associated STAs, poll explicit feedbacks from STAs and receive backhaul CSI feedbacks from neighboring APs. There is no additional Wi-Fi overhead in physical layer. Backhaul feedback link is established through direct peer-to-peer (P2P) link which bypassed the sounding controller to reduce CSI feedback delay.

System and method for backhaul based sounding feedback

A system may include a modifiable mobile device having at least two antennas coupled to fractional amplifiers, with returned power detectors. A beamformer unit provides adaptive beam shaping pattern, and a baseband processor provides beam pattern requirements, wherein the beamformer unit modifies the beam pattern requirements with return loss sampling information to shape the adaptive beam pattern so that a transmitted beam pattern minimizes transmitted power reflected back to the mobile device. A method may include regularly measuring a return power level, if output power is greater than a specific absorption rate level, comparing the return power level to a first threshold, else implementing mobile transmit diversity (MTD), and repeating. If the return power level is greater than the first threshold, implementing a MTD combined with reflection-based beamforming that modifies beam pattern requirements of the mobile device with return loss sampling information to create an adaptive beam pattern.

System and method for adaptive beam forming for specific absorption rate control

Embodiments of the present invention may separately utilize transmit paths of a mobile transmit diversity device to initialize communication with a base station over a random access channel, particularly where the transmit paths have power amplifiers with different characteristics, e.g., different power amplification.

Method and apparatus for random access channel probe initialization using transmit diversity

A method, apparatus, and system for transmitting and controlling uplink diversity signals in a mobile communication device. While in a soft handoff situation, a mobile communications device may receive a phase feedback signal from a non-serving base station. The mobile device may calculate a modified phase parameter based on the phase feedback signal from the non-serving base station in order to minimize interference with the non-serving base station, for example, by calculating a modified value of a phase difference in a direction opposite to the direction desired by the non-serving base station. In some embodiments of the invention, the mobile device may determine whether to calculate the modified phase parameter in a direction opposite to the direction indicated by the phase feedback signal of the non-serving base station based on a comparison of power feedback signals received from the non-serving and serving base stations.

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San Jose, CA, United States of America

Kenneth Kludt