Amazon Technologies, Inc.

Broadcom Corporation

Qiang Hu

Avinash Joshi

Qinghai Gao

QingYun Wei

Piyush Tayal

Xiaofu Ma

Xi Chelsea Chen

Ashish Kumar Shukla

Techniques for performing high-precision presence detection by establishing and monitoring peer-to-peer communication links between user devices residing in a same physical environment. A user device that resides in the environment may establish communication links with multiple other user devices residing in the environment. The user device may monitor the channel properties for those communication links to detect fluctuations in the channel properties caused by a user moving through a signal of the communication links. In examples where the user device detects fluctuations in channel properties for multiple communication links, the user device may determine that the user had moved though signals of the communication links. The user device may determine that, because the user moved through signals of multiple communication links, the user may be in close proximity to the user device, such as in the same room. Thus, the user device monitors multiple communication links to perform presence-detection techniques.

Proximity detection using device-to-device communication links

A method of route discovery in wireless mesh networks comprises: receiving, by a first mesh network device of a wireless mesh network, from a second mesh network device of the wireless mesh network, a first route request identifying a destination mesh network device of the wireless mesh network and a first path selection metric value; determining a path selection metric increment, wherein the path selection metric increment reflects a radio channel contention by the first mesh network device and the second mesh network device; generating a second path selection metric value by adding the path selection metric increment to the first path selection metric value; and broadcasting a second route request identifying the destination mesh network device and the second path selection metric value.

Route discovery in wireless mesh networks

One or more methods and systems to efficiently process MPEG video in order to perform a reverse play or slow rewind function are presented. The method reduces system bandwidth required to implement the reverse play function when SD MPEG video is received by the MPEG decoder. Furthermore, the method maximizes the use of memory resources when one or more video frame buffers are implemented. The system comprises a first subsystem feeding one or more sequences of frames (e.g., feeding sessions) to a second subsystem. The first subsystem defines a set of parameters that is used to determine the one or more feeding sessions provided to the second subsystem. The second subsystem subsequently decodes the one or more feeding sessions using the set of parameters such that the video may be displayed.

Method and system for performing reverse play of SD MPEG video

Growing community of inventors

Sunnyvale, CA, United States of America

Qiang Hu