Cypress Semiconductor Corporation

James Wihardja

Victor Zhodzishsky

Ashutosh Pandey

Jie Lai

Pouria Zand

Manamohan D Mysore

Durai Thirupathi

Nhan Tran

Kiran Uln

Yan Li

Nobuaki Tsunashima

Hongwei Kong

Kamesh Medapalli

Robert W Zopf

Victor Simileysky

Raghavendra Kencharla

Ash Kapur

Munukutla Sandeep Sarma

Yanbing Zhang

Shuji Kumise

Implementations disclosed describe numerous techniques and systems facilitating synchronous actions in wireless networks that have a central device (CD) and multiple peripheral devices (PDs) communicating wirelessly with the CD. The CD communicates one or more messages to the PDs and various PDs determine, using communicated messages, a time of a synchronous action to be performed by the PDs. The synchronous action includes an interaction of a respective PD with one or more associated devices communicatively coupled with the PD. Upon completion of the synchronous action, the PDs may transmit data generated by the PDs, or by the one or more associated devices, in connection with the synchronous action.

Time synchronization in wireless networks

Systems, methods, and devices predict activity of wireless devices. Methods include identifying one or more conditions indicating aperiodic activity will occur at a first radio, the first radio being a wireless radio compatible with a first wireless communications protocol, and receiving, at a second radio, timing information associated with the first radio via an interface between the first radio and the second radio, the second radio being a wireless radio compatible with a second wireless communications protocol, the first radio and the second radio being collocated in a wireless device. Methods also include scheduling wireless activity of the second radio based, at least in part, on the timing information.

Enhanced prediction of timing of activity for wireless devices

A system includes a broadcasting device and one or more receiving devices. The broadcast device is to broadcast an broadcast message to a set of receiving devices, wherein the broadcast message indicates that a broadcasting device is available for connection. The broadcasting device is also to receive, from a receiving device a response messages based on the broadcast message. The broadcasting device is further to determine a distance between the broadcasting device and the receiving device.

Determining distances between broadcasting devices and receiving devices

A system and method for improving the accuracy of a secure phase-based ranging procedure and a Direction Finding procedure. The method includes receiving radio frequency signals from a second communication device. The method includes operating in a first mode including generating first location data based on the radio frequency signals and, transferring the first location data to a second processor in compliance with a Bluetooth Host Control Interface. The method includes comparing one or more conditions to one or more threshold values and responsive to the comparing transitioning from operating in the first mode to operating in a second mode. The method includes, while operating the second mode, generating second location data based on the radio frequency signals and, transferring the second location data to the second processor at a higher data transfer rate than the transferring of the first location data to the second processor.

Higher accuracy secure phase-based ranging and direction finding

Disclosed are techniques for a device that wants to be a central device when creating a connection in a communication network such as Bluetooth Low Energy (BLE) to advertise information associated with a connection window to solicit a connection with a scanning peer device. When the scanning peer device receives the information, it may enter a connection as a peripheral device with the advertising device at the advertised connection window, allowing the advertising device to become the central device. Disclosed are also techniques for a device that wants to be a central device to advertise information associated with a scan window of the device to solicit a directed advertisement event from a peer device during the advertised scan window. The peer device initially scans but may advertise during the scan window as advertised to enable the central device to create a connection where the peer device becomes a peripheral device.

Efficient procedures to create Bluetooth LE central connection on an advertiser

Implementations disclosed describe techniques and systems that improve wireless connectivity between devices that support multiple operation modes, by monitoring a quality of the established wireless connection and performing a change of the operation mode in response to changing conditions. The disclosed techniques include obtaining metrics characterizing quality of the wireless connection, identifying a utility function that is specific to an application supported by the wireless connection, computing multiple values of the utility function for various operation modes, based on the obtained metrics, and initiating a change of the operation mode based on a comparison of the computed utility values.

Adaptive wireless connections in multi-mode devices

Implementations disclosed describe techniques and systems to facilitate efficient operations of wireless networks organized in a topology of communicating nodes. Techniques include cascade synchronization of various nodes of the network by generating and maintaining a common time using times associated with ordered communications between nodes. The common time maintained by the network allows performance of synchronous action for precise industrial, medical, and testing applications. The described techniques and systems further include management of communication windows between different nodes in a way that facilitates fast and efficient propagation of data collected by the network from multiple source nodes to one or more destination nodes. The techniques further include efficient assignment and flexible management of communication frequencies (channels) to various nodes of the network to reduce interference and noise by assigning different communication frequencies to the nodes that utilize concurrent communications windows.

Management of communication channels in wireless networks

Disclosed are techniques to compensate frequency systematic known error (FSKE) in reflector or initiator radios using a hybrid RF-digital approach in multi-carrier phase-based ranging. The hybrid RF-digital approach combines a coarse frequency compensation technique in the RF domain and a fine frequency compensation technique in the digital domain to remove the FSKE across all carrier frequencies from a device. The coarse frequency compensation performed in the RF domain may use a PLL to multiply the crystal frequency to arrive close to a target carrier frequency to compensate for a coarse portion of the known FSKE at the target frequency. The fine frequency compensation may use digital techniques to remove the remaining portion of the known FSKE not compensated by the RF. The hybrid approach reduces the number of fractional bits in the multiplier of the PLL when compared to an approach that uses only the RF-PLL to remove the FSKE.

Coarse and fine compensation for frequency error

Example apparatus, systems and methods use a receiver of a first device to receive from a second device, radio frequency (RF) signals. Embodiments use a processor of the first device to determine, based on the RF signals, a set of angle-estimation values of an angle between a plurality of antenna elements of one of the first device and the second device and an antenna element of the other of the first device and the second device, and a set of confidence measurements. Each of the set of confidence measurements indicates a confidence of an angle-estimation value of the set of angle-estimation values.

Estimating angle measurements for source tracking using a phased array system

A method includes using a receiver of a first device, receiving from a second device, radio frequency (RF) signals. The method also includes using a processor of the first device, determining and storing, based on the RF signals, a set of angle-estimation values of an angle between a plurality of antenna elements of one of the first device and the second device and an antenna element of the other of the first device and the second device, a set of confidence measurements, and at least one of an Area-of Arrival (ARoA) value and an Area-of Departure (ARoD) value. Each of the set of confidence measurements indicates a confidence of an angle-estimation value of the set of angle-estimation values.

Source tracking for phased array systems is described herein. One processing device includes a transceiver to transmit or receive radio frequency (RF) signals via a plurality of antenna elements and a processor coupled to the transceiver. The processor executes a multi-angle source-tracking tool configured to determine and store a set of angle estimation values of an angle between the plurality of antenna elements and the second antenna, a set of confidence measurements, and at least one of an Area-of-Arrival (ARoA) value or an Area-of-Departure (ARoD) value based on the RF signals. Each of the set of confidence measurements indicates a confidence of an angle estimation value of the set of angle estimation values.

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Tustin, CA, United States of America

James Wihardja