公开(公告)号：US20220166707A1

公开(公告)日：2022-05-26

申请号：US17102003

申请日：2020-11-23

Applicant: Cisco Technology, Inc.

Inventor： LING WEI ,  WENJIA WU ,  NAN YI ,  CHUANWEI LI

IPC: H04L12/725 ,  H04L12/18 ,  H04L12/46

Abstract: 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.

公开(公告)号：US20200280391A1

公开(公告)日：2020-09-03

申请号：US16289859

申请日：2019-03-01

Applicant: Cisco Technology, Inc.

Inventor： LELE ZHANG ,  HUIMIN SHE ,  CHUANWEI LI ,  NAN YI

IPC: H04L1/00 ,  H04W74/08

Abstract: In one embodiment, a method comprises determining, by a network device in a wireless data network, that a prescribed Clear Channel Assessment (CCA) threshold is unsuitable for use on an identified wireless network channel among available wireless network channels, based on a determined variance of a corresponding channel transmit attempt failure rate for the identified wireless network channel, relative to an expected variance in channel transmit attempt failure rates that is determined across the respective available wireless network channels; and selectively adjusting the corresponding CCA threshold for the identified wireless network channel, until a second determined variance of the corresponding channel transmit attempt failure rate, at the identified wireless network channel, falls below a prescribed channel failure rate variance factor relative to the expected variance.

公开(公告)号：US20190268942A1

公开(公告)日：2019-08-29

申请号：US15905647

申请日：2018-02-26

Applicant: Cisco Technology, Inc.

Inventor： NAN YI ,  HUIMIN SHE ,  YONG ZHANG ,  CHUANWEI LI

IPC: H04W74/08

Abstract: A computer-implemented method of determining backoff windows in a wireless computer network is disclosed. The method comprises defining, by an access point in the wireless computer network, a plurality of collision patterns related to message transmission via one or more communication channels in the wireless computer network; detecting, by the access point, occurrence of one of the plurality of collision patterns involving a group of sender nodes in the wireless computer network that have each transmitted a message to the access point and received no acknowledgement message from the access point indicating successful transmission; setting to a first length a length of a backoff window for avoiding collision in data transmission based on a size of the group of sender nodes; sending a first message to a first plurality of nodes in the wireless computer network, the first message instructing performance of backoff during the backoff window having the first length.