Wireless network with multiple paths between nodes

• US 9,596,642 B2
• Filed: 12/22/2014
• Issued: 03/14/2017
• Est. Priority Date: 12/22/2014
• Status: Active Grant

• Current Assignee: Life Safety Distribution AG (Honeywell International Inc.)
• Original Assignee: Life Safety Distribution AG (Honeywell International Inc.)
• Inventors: Premarini, Giuseppe, Susel, Michele, Merli, Daniel, Caudell, Martin John
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): SAMUEL, DEWANDA A
• Application Number:
  US14/579,065
• Publication Number:
  US 20160183160A1
• Time in Patent Office: 813 Days
• Field of Search: 370/393, 370/395.54, 370/425
• US Class Current: 1/1
• CPC Class Codes: H04L 41/0803 Configuration setting
• CPC Class Codes: H04W 40/10 based on available power or energy
• CPC Class Codes: H04W 52/0203 in the radio access network or backbone network of wireless communication networks
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless communications system includes both a primary communications path, wherein a gateway can communicate with each member of a plurality of ambient condition detectors, and a secondary back-up path available in the event of a failure on part of the primary path. Required power for the network can be minimized by path selection.

Claims

1. A method comprising:

establishing a maximum distance parameter, wherein the maximum distance parameter is calculated by accounting for radio attenuation factors at an installation site and a physical distance between devices;

assigning an initial network address to a gateway;

determining a first set of nodes of a plurality of nodes that are within the maximum distance parameter of the gateway;

assigning a first level value to each of the first set of nodes;

determining a second set of nodes of the plurality of nodes by each of the first set of nodes searching for no more than two of the plurality of nodes that are within the maximum distance parameter of a respective one of the first set of nodes and that are not included in the first set of nodes to establish a primary path;

assigning a second level value to each of the second set of nodes, the second level value being one greater than the first level value; and

assigning network addresses to each of the plurality of nodes, wherein a first node of the first set of nodes is assigned a network address one value greater than the initial network address, and wherein each node in the first set of nodes after the first node is assigned an incrementally higher value network address until all nodes in the first set of nodes are assigned a unique network address.

2. The method as in claim 1 further comprising assigning the network addresses to all nodes in the plurality of nodes.

3. The method as in claim 2 wherein the network addresses are assigned to all nodes in the first set of nodes, before the network addresses are assigned to the second set of nodes.

4. The method as in claim 3 further comprising creating a secondary path between each of the plurality of and the gateway.

5. The method as in claim 4 wherein creating the secondary path includes:

a first of the plurality of nodes searching for a second of the plurality of nodes within the maximum distance parameter to the first of the plurality of nodes but not connected to the first of the plurality of nodes via the primary path;

the first of the plurality of nodes connecting to the second of the plurality of nodes; and

the second of the plurality of nodes searching for a third of the plurality of nodes within the maximum distance parameter to the second of the plurality of nodes but not connected to the second of the plurality of nodes via the primary path.

6. The method as in claim 5 wherein the secondary path comprises a spiral shaped path when viewing the secondary path from above.

7. A communications system comprising:

a gateway unit; and

a plurality of secondary units,

wherein each of the plurality of secondary units communicates with at least one other of the plurality of secondary units and the gateway unit by at least first and second communications paths,

wherein a length of branches of the first and second communications paths is less than or equal to a predetermined distance related parameter, and

wherein the length of the branches of the first and second communications paths is less than or equal to an adjusted distance related parameter taking into account radio attenuation factors at an installation site.

8. The communications system as in claim 7 wherein each of the plurality of secondary units and the gateway unit communicate wirelessly.

9. The communications system as in claim 7 wherein each of the plurality of secondary units is battery powered.

10. The communications system as in claim 9 wherein distances between communicating secondary units of the plurality of secondary units minimize power consumption.

11. The communications system as in claim 7 wherein at least one of the plurality of secondary units comprises an ambient condition detector.

12. The communications system as in claim 7 wherein the gateway unit comprises a wireless interface for an alarm monitoring system.