Method and wireless network system for improving wireless network connection

Patent metadata

Field	Value
Publication number	US-10517103-B2
Application number	US-201815981025-A
Country	US
Kind code	B2
Filing date	May 16, 2018
Priority date	Oct 24, 2017
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A method for improving wireless network connection is provided. The method is used in a mobile node moving in an area and includes: respectively receiving spatial information broadcasted by a root node and fixed nodes in a plurality of cells constituting the area, wherein each of the fixed nodes is directly connected to the root node, or indirectly connected to the root node through one or more other fixed nodes; obtaining current leakage weight values of the mobile node that is directly connected to the root node and is indirectly connected to the root node through the fixed nodes according to the spatial information received in each of the cells; generating a connection leakage table according to the largest one among the current leakage weight values; and determining a target position of the area which the mobile node moves to according to the connection leakage table.

First claim

What is claimed is:

1. A method for improving wireless network connection, used in a mobile node moving in an area, comprising:
respectively receiving spatial information broadcasted by a root node and a plurality of fixed nodes in a plurality of cells constituting the area, wherein each of the fixed nodes is directly connected to the root node, or indirectly connected to the root node through one or more other fixed nodes;
obtaining a plurality of current leakage weight values of the mobile node that is directly connected to the root node and is indirectly connected to the root node through the fixed nodes according to the spatial information received in each of the cells;
generating a connection leakage table according to the largest leakage weight value among the plurality of current leakage weight values corresponding to each of the cells; and
determining a target position of the area which the mobile node moves to according to the connection leakage table,
wherein the spatial information broadcasted by the root node and the plurality of fixed nodes at least comprises:

signal strength;
a network loading, wherein the network loading comprises bandwidth information, throughput information, packet loss information, and traffic count information; and
a system loading, wherein the system loading comprises CPU information and memory information.

2. The method for improving wireless network connection as claimed in claim 1 , wherein the step of generating the connection leakage table according to the largest leakage weight value among the plurality of current leakage weight values corresponding to each of the cells further comprises:
obtaining a leakage weight value at this time corresponding to each of the cells according to the largest leakage weight value among the current leakage weight values and historical information corresponding to the largest leakage weight value;
wherein the leakage weight value at this time corresponding to each of the cells is expressed as follows:
WL t =α·WL t-1 +(1−α) WL current

wherein WL t is the leakage weight value at this time, WL t-1 is the historical information corresponding to the largest leakage weight value, WL current is the largest leakage weight value among the current leakage weight values, and α is a coefficient.

3. The method for improving wireless network connection as claimed in claim 1 , wherein when the mobile node is directly connected to the root node, the current leakage weight value is expressed as follows:
WL current =α·SS+β·NL+γ·SL

wherein WL current is the current leakage weight value, SS is the signal strength of the root node, NL is the network loading of the root node, SL is the system loading of the root node, and the sum of α, δ and γ is 1; and
wherein when the mobile node is indirectly connected to the root node through a first fixed node, the current leakage weight value is expressed as follows:
WL Node =α·SS+β·NL+γ·SL
WL current =α 1 ·WL Root +(1−α 1 )· WL Node

wherein WL current is the current leakage weight value, WL Root is the leakage weight value of the first fixed node connected to the root node at this time, and WL node is the current leakage weight value of the mobile node connected to the first fixed node, and the sum of α, β and γ is 1, α 1 is a value between 0 and 1.

4. The method for improving wireless network connection as claimed in claim 1 , wherein the step of determining the target position of the area which the mobile node moves to according to the connection leakage table further comprises:
obtaining at least one cell and at least one first node corresponding to the at least one leakage weight value according to the at least one leakage weight value in the connection leakage table and obtaining the target position according to at least one first central point between the cell and the first node.

5. A wireless network system, comprising:
a root node;
a plurality of fixed nodes, wherein each of the fixed nodes is directly connected to the root node or connected to the root node through one or more fixed nodes; and
a mobile node, moving in a plurality of cells constituting an area and respectively receiving spatial information broadcasted by the root node and the plurality of fixed nodes; obtaining a plurality of current leakage weight values of the mobile node that is directly connected to the root node and is indirectly connected to the root node through one or more other fixed nodes according to the spatial information received in each of the cells; generating a connection leakage table according to the largest leakage weight value among the plurality of current leakage weight values obtained by the mobile node in each of the cells; and determining a target position of the area which the mobile node moves to according to the connection leakage table,
wherein the spatial information broadcasted by the root node and the plurality of fixed nodes at least comprises:
signal strength;
a network loading, wherein the network loading comprises bandwidth information, throughput information, packet loss information and traffic count information; and
a system loading, wherein the system loading comprises CPU information and memory information.

6. The wireless network system as claimed in claim 5 , wherein the mobile node generating the connection leakage table according to the largest leakage weight value among the plurality of current leakage weight values in each of the cells further executes:
obtaining a leakage weight value at this time corresponding to each of the cells according to the largest leakage weight value among the current leakage weight values and historical information corresponding to the largest leakage weight value;
wherein the leakage weight value at this time corresponding to each of the cells is expressed as follows:
WL t =α·WL t-1 +(1−α) WL current

wherein WL t is the leakage weight value at this time, WL t-1 is the historical information corresponding to the largest leakage weight value, WL current is the largest leakage weight value among the current leakage weight values, and a is a coefficient.

7. The wireless network system as claimed in claim 5 , wherein when the mobile node is directly connected to the root node, the current leakage weight value is expressed as follows:
WL current =α·SS+β·NL+γ·SL
wherein WL current is the current leakage weight value, SS is the signal strength of the root node, NL is the network loading of the root node, SL is the system loading of the root node, and the sum of α, β and γ is 1; and
wherein when the mobile node is indirectly connected to the root node through a first fixed node, the current leakage weight value is expressed as follows:
WL node =α·SS+β·NL+γ·SL
WL current =α 1 ·WL Root +(1−α 1 )· WL Node

wherein WL current is the current leakage weight value, WL Root is the leakage weight value of the first fixed node connected to the root node at this time, and WL node is the current leakage weight value of the mobile node connected to the first fixed node, and the sum of α, β and γ is 1, α 1 is a value between 0 and 1.

8. The wireless network system as claimed in claim 5 , wherein the mobile node determining the target position of the area which the mobile node moves to according to the connection leakage table further executes:
obtaining at least one cell and at least one first node corresponding to the at least one leakage weight value according to the at least one leakage weight value in the connection leakage table and obtaining the target position according to at least one first central point between the cell and the first node.

Assignees

• Quanta Comp Inc

Inventors

• Yeh Chih-Tsang
• Wang yang-sheng
• Chen Yu-Ching
• Hsu Chin-Hua
• Lin Chia-Feng
• Ho Yu-Ting

Classifications

• H04W72/542 Primary

  using measured or perceived quality · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04W64/00

  Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management · CPC title

• H04W84/005

  Moving wireless networks · CPC title

• H04L12/2803

  Home automation networks · CPC title