公开(公告)号：US11265797B2

公开(公告)日：2022-03-01

申请号：US17011978

申请日：2020-09-03

Applicant: Qinghai Normal University

Inventor： Xiujuan Du ,  Chong Li ,  Lijuan Wang

IPC: H04W40/08 ,  H04W40/10 ,  H04W40/20 ,  H04W40/38

Abstract: A depth and distance-based single-path routing method, in which location information of nodes in network is gathered after initialization is completed, and a location table of whole-network nodes maintained by the sink node is generated. The update mechanism of the uplink Location frame is switched to a unicast triggering update mechanism to execute a depth and energy-based uplink routing algorithm. For a downlink control packet arriving at a specified ID, location information of a node is obtained through the location table to execute a distance and energy-based downlink routing policy. The distance and energy-based downlink routing policy for a downlink control packet arriving at a specified location and a downlink control packet arriving at the specified ID is executed, and a routing recovery algorithm is executed when an “open area” occurs.

公开(公告)号：US11722245B2

公开(公告)日：2023-08-08

申请号：US17971408

申请日：2022-10-21

Applicant: Qinghai Normal University

Inventor： Xiuxiu Liu ,  Xiujuan Du ,  Long Jin

IPC: H04L1/00 ,  H04B13/02

CPC classification number: H04L1/005 ,  H04B13/02 ,  H04L1/0061

Abstract: A data encoding and decoding method for underwater acoustic networks (UANs) based on an improved online fountain code, including: in a build-up phase, subjecting all original packets to sequential encoding according to their serial numbers to generate and send encoded packets with degree 2; merging k original packets to k/8 connected components with a size of 8; performing random encoding until a largest connected component is successfully decoded; in a completion phase, sending, by a receiver, a feedback packet according to a current decoding graph; according to a feedback packet containing decoding states of all the original packets, sending, by a sender, encoded packets with degree m; and randomly selecting original packets for recursive encoding to generate and send encoded packets with degree 1 or 2; and setting, by the receiver, a threshold to restrict the number of feedback packets.

公开(公告)号：US12119999B2

公开(公告)日：2024-10-15

申请号：US18516741

申请日：2023-11-21

Applicant: Qinghai Normal University

Inventor： Xiujuan Du ,  Xiaojing Tian

IPC: H04L41/12 ,  H04B13/00 ,  H04L67/12

CPC classification number: H04L41/12 ,  H04B13/00 ,  H04L67/12

Abstract: A routing protocol method for Underwater Acoustic Sensor Networks (UASNs) based on layering and source location privacy (SLP) is provided. (1) A proxy area is selected randomly by a source node. (2) A packet is delivered from the source node to the proxy area through a forwarding probability-based multipath routing algorithm, and a layer-based priority is given to candidate neighbor nodes to alleviate a long detour problem. (3) A proxy node in the proxy area is selected randomly. (4) The packet is delivered from the proxy node to a sink node through the forwarding probability-based multipath routing algorithm. (5) Steps (1) to (4) are repeated until the source node is changed or an adversary finds a position of the source node.

公开(公告)号：US11784723B2

公开(公告)日：2023-10-10

申请号：US17876778

申请日：2022-07-29

Applicant: Qinghai Normal University

Inventor： Xiujuan Du ,  Duoliang Han ,  Yi Shang

IPC: H04B13/02 ,  H04B13/00 ,  H04L12/755 ,  H04B11/00 ,  H04L45/021

CPC classification number: H04B13/02 ,  H04B11/00 ,  H04L45/021

Abstract: A method for implementing a many-to-one concurrent transmission medium access control (MAC) protocol for underwater acoustic networks, including: initializing a network; setting a timer; initiating, by a receiving node, a control frame to perform handshakes with multiple nodes; exchange ID, level and location of the receiving node and a sending node, and counting the number of nodes that generate a sending notification (SN) message before timeout; and planning, by the receiving node, a receiving scheduling time of data from different nodes according to the number of successful handshake nodes, distance from each sending node to the receiving node, and data packet size; and performing data transmission.

公开(公告)号：US11658752B1

公开(公告)日：2023-05-23

申请号：US17941254

申请日：2022-09-09

Applicant: Qinghai Normal University

Inventor： Xiujuan Du ,  Lijuan Wang

IPC: H04B13/02 ,  H04W84/18 ,  H04B7/00

CPC classification number: H04B13/02 ,  H04B7/00 ,  H04W84/18

Abstract: This application relates to underwater wireless sensor networks, and more particularly to a node positioning method for an underwater wireless sensor network (UWSN) based on zeroing neural dynamics (ZND), including: (S1) defining a time-varying problem of node positioning of the UWSN based on an angle of arrival (AOA) algorithm and a time difference of arrival (TDOA) algorithm; (S2) performing modeling for the time-varying problem to acquire a mathematical model of a linear dynamic matrix equation; (S3) establishing a modified zeroing neural dynamics (MZND) model with a nonlinear activation function; and (S4) solving the time-varying problem by utilizing the MZND model to complete the node positioning of the UWSN.