Cisco Technology, Inc.

Qualcomm Incorporated

Wenjia Wu

Chuanwei Li

Nan Yi

Akram Ismail Sheriff

Huimin She

Lele Zhang

Ling Wei

Guangning Fu

Mindong Zhou

In one embodiment, a method comprises: determining, by a network device that is configured for joining a local directed acyclic graph (DAG) instance in a data network, an unreachability by the network device to any member of the local DAG instance; generating and broadcasting, by the network device, a request message that identifies the network device requesting to join the local DAG instance, the request message causing a neighboring network device in a global DAG instance of the data network to rebroadcast the request message for reception by a member of the local DAG instance, the neighboring network device a non-member of the local DAG instance; and receiving, by the network device, a reply message indicating a member of the local DAG instance is reachable via the neighboring network device in the global DAG instance.

Interconnecting local RPL instance nodes via global RPL instance node as AODV relay

In one embodiment, a device in a network determines that a plurality of packets should be aggregated, each of the plurality of packets comprising a payload. The device generates, for each of the payloads, a sub-media access control (sub-MAC) header that comprises a sequence number and a frame check sequence (FCS). The device forms an aggregated packet that comprises a physical layer (PHY) header, a MAC header, the payloads, and the generated sub-MAC headers for the payloads. The device sends the aggregated packet to another device in the network.

Efficient transmission of small packets in low power and lossy networks

Techniques and mechanisms for detecting and deducing of urgent messages in low-power and lossy networks (LLNs) using a correlation analysis of the nodes within a network and machine learning (ML) models. Utilizing these techniques, a field network director (FND) of the network can determine neighboring devices within the network. ML models may be utilized to determine that based upon receipt of a power outage notification (PON) message and/or a power restoration notification (PRN) message from nodes, neighboring nodes of the nodes may also have suffered a power outage and/or a subsequent power restoration, even if the FND did not receive a corresponding PON message and/or a corresponding PRN message from the neighboring nodes of the network. Thus, loss of power and subsequent power restoration may be handled for large numbers of neighboring nodes within the network, even when only a few PON messages and/or subsequent PRN messages are received.

Detection and deduction of urgent messages in low power and lossy networks

A method and apparatus for synchronizing operations between a first circuit and a second circuit is disclosed. The method involves writing receive data from the first circuit to a first ring buffer at a first rate. The first ring buffer has a fixed-length of buffer elements and respective read and write buffer pointers. The buffered receive data is read from the first ring buffer to the second circuit at a second data rate. The respective positions of the read and write buffer pointers are detected, and a relative position between the read and write pointers is dynamically adjusted to enforce at least a predetermined minimum spacing. The dynamic adjustment comprises selectively adding or deleting portions of the data to or from the ring buffer.

Growing community of inventors

Shanghai, China

Wenjia Wu