公开(公告)号：US11909543B2

公开(公告)日：2024-02-20

申请号：US17727348

申请日：2022-04-22

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Huimin She ,  Feiliang Wang ,  Yinfang Wang

IPC: H04L12/00 ,  H04L12/18 ,  H04L45/16 ,  H04L49/201 ,  H04L65/611

CPC classification number: H04L12/18 ,  H04L45/16 ,  H04L49/201 ,  H04L65/611

Abstract: In one embodiment, a method comprises: generating, by a constrained low power and lossy network (LLN) device that is localized within a subregion of an LLN, a thin destination oriented directed acyclic graph (DODAG) having up to a prescribed limit of attached LLN devices at each hop of the thin DODAG based on generating a DODAG information object (DIO) message specifying an instruction for limiting attachment at each hop of the thin DODAG to the prescribed limit; and causing, by the constrained LLN device, multicast-only transmissions via the thin DODAG based on inserting into the DIO message a multicast-only transmission mode via the thin DODAG and outputting the DIO message, the DIO message causing each neighboring LLN device to selectively attach to the constrained LLN device as an attached child LLN device based on the instruction and execute the multicast-only transmissions via the thin DODAG.

公开(公告)号：US20220038360A1

公开(公告)日：2022-02-03

申请号：US17410015

申请日：2021-08-24

Applicant: Cisco Technology, Inc.

Inventor： Yinfang Wang ,  Yajun Xia ,  Feiliang Wang ,  Chuanwei Li

IPC: H04L12/26 ,  H04L12/18 ,  H04B3/54 ,  H04W72/12

Abstract: In one embodiment, a technique comprises monitoring data transfer over a radio frequency (RF) link between a first device and a second device in a mesh network where the second device is a descendent node and the first device is a parent node. The technique further transfers the data over a power link communication (PLC) when the RF link is inactive. The method also includes broadcasting, by the second device, RF link availability to at least a third device in the mesh network when the RF link with the first device is inactive where the third device has an active link with the second device and the third device is a descendent node of the second device. The method then includes communicating, between the second device and the third device, through the active RF link.

公开(公告)号：US11349807B2

公开(公告)日：2022-05-31

申请号：US16838252

申请日：2020-04-02

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Yinfang Wang ,  Huimin She ,  Feiliang Wang

IPC: H04L29/12 ,  H04L12/24 ,  H04L29/06 ,  H04L12/18 ,  H04L61/5069 ,  H04L41/12 ,  H04L69/22 ,  H04L101/659

Abstract: In one embodiment, a method comprises: receiving, by a root network device providing a DAG topology in a low power and lossy network (LLN), one or more multicast registration messages from an LLN device and identifying distinct properties of the LLN device; receiving, by the root network device, one or more multicast address group identifiers of one or more multicast streams to which the LLN device has subscribed, and associating the one or more multicast address group identifiers with the distinct properties; receiving a multicast message specifying one of the multicast address group identifiers; and generating, by the root network device, a directed multicast message having a multi-dimensional addressing data structure comprising a selected one of the distinct properties and the one multicast address group identifier, causing parent network devices in the DAG topology to selectively retransmit based on determining a child network device has the selected one distinct property.

公开(公告)号：US11128554B1

公开(公告)日：2021-09-21

申请号：US16265046

申请日：2019-02-01

Applicant: Cisco Technology, Inc.

Inventor： Yinfang Wang ,  Yajun Xia ,  Feiliang Wang ,  Chuanwei Li

IPC: H04L12/26 ,  H04B3/54 ,  H04L12/18 ,  H04W72/12 ,  H04W84/18

Abstract: In one embodiment, a technique comprises monitoring data transfer over a radio frequency (RF) link between a first device and a second device in a mesh network where the second device is a descendent node and the first device is a parent node. The technique further transfers the data over a power link communication (PLC) when the RF link is inactive. The method also includes broadcasting, by the second device, RF link availability to at least a third device in the mesh network when the RF link with the first device is inactive where the third device has an active link with the second device and the third device is a descendent node of the second device. The method then includes communicating, between the second device and the third device, through the active RF link.

公开(公告)号：US11811636B2

公开(公告)日：2023-11-07

申请号：US17410015

申请日：2021-08-24

Applicant: Cisco Technology, Inc.

Inventor： Yinfang Wang ,  Yajun Xia ,  Feiliang Wang ,  Chuanwei Li

IPC: H04L43/0888 ,  H04B3/54 ,  H04L12/18 ,  H04W72/12 ,  H04W84/18

CPC classification number: H04L43/0888 ,  H04B3/54 ,  H04L12/189 ,  H04W72/12 ,  H04W84/18

Abstract: In one embodiment, a technique comprises monitoring data transfer over a radio frequency (RF) link between a first device and a second device in a mesh network where the second device is a descendent node and the first device is a parent node. The technique further transfers the data over a power link communication (PLC) when the RF link is inactive. The method also includes broadcasting, by the second device, RF link availability to at least a third device in the mesh network when the RF link with the first device is inactive where the third device has an active link with the second device and the third device is a descendent node of the second device. The method then includes communicating, between the second device and the third device, through the active RF link.

公开(公告)号：US11777900B2

公开(公告)日：2023-10-03

申请号：US17724941

申请日：2022-04-20

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Yinfang Wang ,  Huimin She ,  Feiliang Wang

IPC: H04L61/5069 ,  H04L41/12 ,  H04L69/22 ,  H04L12/18 ,  H04L101/659

CPC classification number: H04L61/5069 ,  H04L12/185 ,  H04L41/12 ,  H04L69/22 ,  H04L2101/659

Abstract: In one embodiment, a method comprises: receiving, by a root network device providing a DAG topology in a low power and lossy network (LLN), one or more multicast registration messages from an LLN device and identifying distinct properties of the LLN device; receiving, by the root network device, one or more multicast address group identifiers of one or more multicast streams to which the LLN device has subscribed, and associating the one or more multicast address group identifiers with the distinct properties; receiving a multicast message specifying one of the multicast address group identifiers; and generating, by the root network device, a directed multicast message having a multi-dimensional addressing data structure comprising a selected one of the distinct properties and the one multicast address group identifier, causing parent network devices in the DAG topology to selectively retransmit based on determining a child network device has the selected one distinct property.

公开(公告)号：US10856170B1

公开(公告)日：2020-12-01

申请号：US16438669

申请日：2019-06-12

Applicant: Cisco Technology, Inc.

Inventor： Yajun Xia ,  Chuanwei Li ,  Lele Zhang ,  Yinfang Wang

IPC: H04W28/02 ,  H04L29/08 ,  H04L29/06 ,  H04W12/06 ,  H04W84/18

Abstract: In one embodiment, a method comprises: forwarding, by a root network device in a low power and lossy network, an authentication message to a constrained child network device having attached to the root network device, the authentication message generated by an authenticator device and specifying a certificate associated with the authenticator device; receiving a second authentication message destined for a second constrained network device via the constrained child network device; removing, from the second authentication message, the certificate; and outputting, by the root network device, the modified second authentication message that does not include the certificate toward the second constrained network device via the constrained child network device, the modified second authentication message causing the constrained child network device to restore the second authentication message for delivery to the second constrained network device, based on insertion of the certificate back into the modified second authentication message.