Nec Laboratories America, Inc.

Alcatel Lucent

Kishore Ramachandran

Sampath Rangarajan

Narayan Prasad

Ravindranath Kokku

Karthikeyan Sundaresan

Lei Xu

Yueping Zhang

Rajesh Mahindra

Chueng-Hsien Lin

Atul Singh

Ankit Singla

A method implemented in a wireless communications system is disclosed. The method includes determining a first candidate set of transmit beams for a wireless transmitter having a transmit antenna array and a second candidate set of receive beams for a wireless receiver having a receive antenna array, transmitting, from the wireless transmitter, each transmit beam in the first candidate set, and applying, at the wireless receiver, receive beams in the second candidate set to receive said each transmit beam in the first candidate set. Other methods, systems, and apparatuses also are disclosed.

Beamforming

In the method, communication is established between a mobile device and access points in a wireless local area network by first connecting to a first access point on a first channel. After the first connection is established, the method determines whether a second access point is available before disconnecting from the first connection. If a signal strength of the first connection drops below a signal strength threshold, the method second connects to the second access point on a second channel. The above-described method is an example of a make-before-break or soft handoff methodology.

Method of performing handoffs in wireless local area networks

A method implemented in a wireless communications system is disclosed. The method includes: transmitting, from a wireless transmitter having a transmit antenna array, a first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS), receiving, at a wireless receiver having a receive antenna array, the first signal, and determining, at the wireless receiver, quality of the first signal. Other methods, systems, and apparatuses also are disclosed.

A method for wireless network connectivity in a data center includes communicating between nodes in a data center across a wireless interconnectivity through artificially created paths between nodes in the data center, the nodes being at least one of a server, router, switch, and other such components in the data center that require connectivity; and managing the wireless interconnectivity by a control and management entity.

Wireless network connectivity in data centers

An all-optical transmission system includes an optical switch matrix, a plurality of optical components communicating over the optical switch matrix, and a top of rack (ToR) switch coupled to each optical component. Each ToR switch communicates with the optical components and with other ToR switches. The optical component includes a send circuit and a receive circuit with the send circuit having a ToR transceiver to receive data, a multiplexer coupled to the ToR transceiver, a Wavelength Selective Switch (WSS) coupled to the multiplexer, and a circulator coupled to the WSS.

Optical switching network

Methods and systems for enabling the rectification of deteriorated channel conditions on a communication link are described. In particular, the methods and systems can employ mechanisms that prioritize beams in accordance with signal quality measures, direction of departures of transmission beams and/or direction of arrivals of reception beams to address variable channel conditions.

Systems and methods for prioritizing beams to enable efficient determination of suitable communication links

Methods and systems for rectifying deteriorated channel conditions on a communication link are described. In response to the detection of a link deterioration event, a cluster of beams about a currently utilized beam pair can be trialed to determine a suitable, alternate pair of beams on which to establish a communication link. In turn, in the case of a link blockage event, a set of beams having a relatively large azimuthal angle with respect to a currently utilized beam pair can be trialed to determine a suitable beam pair for further communication.

Beam combination methods and systems for adapting communication links to varying channel conditions

Systems and methods are disclosed to partition a multicast group into a plurality of partitions where each partition has a mutually exclusive subset of users or clients; scheduling beam transmission with switched beamforming antennas; and performing the multicast transmission in accordance with the beam scheduling.

Optimal beam scheduling for multicasting in wireless networks

Systems and methods for joint training of beam patterns in a system having a transmitter and a receiver. Initial transmit and receive beam pattern vectors are first selected. The beam pattern vectors are perturbed to produce a plurality of perturbed transmit and receive beam pattern vectors. A received signal power between the transmitter and the receiver is estimated for each combination of the perturbed transmit and the perturbed receive beam pattern vectors. The transmit and receive beam pattern vectors having a highest received signal power are applied to the transmitter and the receiver respectively. The perturbation, estimation, and application steps are iterated until the received signal power meets a convergence criterion.

Fast convergence to optimal beam patterns

A method for operation of a node operating in a wireless network comprising the steps of during an initial phase, setting transmission power and data transmission rate to initial settings and transmitting the initial settings to the wireless network in order to initiate communication with said wireless network during a reference phase once communication with the wireless network is established by the initial phase, transmitting at maximum power while performing a rate adaptation and at least one variable estimation and during an operational phase, transmitting at a power level that is optimal for transmission based on information obtained from the reference phase.

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North Brunswick, NJ, United States of America

Kishore Ramachandran