Systems and methods for recovering an out-of-service node in a hierarchical network

Patent metadata

Field	Value
Publication number	US-10039018-B2
Application number	US-201414490081-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Oct 27, 2011
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

Systems and methods for communicating with a radio frequency (RF) device are disclosed herein. In particular, a method of recovering an out-of-service node comprises sending a hailing message on a plurality of hailing channels from a second node to the out-of-service node, the second node being in direct wireless communication with the out-of-service node, and sending a synchronization request message from the second node to the out-of-service node on a first data channel.

First claim

The invention claimed is:

1. A wireless communication network comprising:
a plurality of nodes, each node being configured in wireless communication with at least one other node, and at least one of the plurality of nodes being configured in wireless communication with a utility provider;
wherein the utility provider and the plurality of nodes are arranged in a hierarchy with the utility provider being highest in the hierarchy, the plurality of nodes being arranged such that two nodes in direct wireless communication with each other include a parent node and a child node, the parent node being higher in the hierarchy with respect to the child node; and
wherein, when a first node of the plurality of nodes is determined to be out-of-service, the plurality of nodes are configured to perform a recovery procedure to restore the first node to operation, the recovery procedure including
transmitting a hailing message on a plurality of hailing channels from a second node to the first node, the first node being in a sniffing mode,
transmitting a time synchronization signal from the second node to the first node, the second node being in direct wireless communication with the first node, and
determining, by the first node, whether the time synchronization signal causes a time shift greater than a predefined threshold,
wherein the first node is configured to perform a super sniffing mode for a predetermined time period, responsive to determining that the time synchronization signal causes a time shift greater than the predefined threshold, the super sniffing mode comprising searching the plurality of hailing channels in a sequential mode for a hailing signal until the hailing signal is discovered from the parent node,
wherein no waiting period exists between each search of the plurality of hailing channels in the sequential mode.

2. The wireless communication network of claim 1 , wherein the recovery procedure further includes sending an acknowledge message from the first node to the second node.

3. The wireless communication network of claim 1 , wherein the second node sends the hailing message on 50 hailing channels.

4. The wireless communication network of claim 1 , wherein the recovery procedure includes supplying the time synchronization signal from a field radio to the first node.

5. The wireless communication network of claim 1 , wherein the first node is determined to be out-of-service when it fails to communicate with other nodes for at least a predetermined length of time.

6. The wireless communication network of claim 5 , wherein the predetermined length of time is ten days.

7. The wireless communication network of claim 5 , wherein, if the first node resumes communicating with the other nodes before the predetermined length of time, the first node receives the time synchronization signal from one of the other nodes to enable the first node to continue operation.

8. The wireless communication network of claim 1 , wherein the first node is determined to be out-of-service when the first node is a new node replacing a non-functioning node.

9. The wireless communication network of claim 1 , wherein at least one of the plurality of nodes is associated with at least one meter for measuring utility usage for the utility provider.

10. The wireless communication network of claim 1 , wherein the predefined threshold is seven seconds.

11. A radio frequency (RF) device of a plurality of RF devices configured within a wireless communication network, the RF device comprising:
an oscillator operatively configured to maintain a reference clock signal;
an antenna operatively configured to transmit RF communication signals directly to and receive RF communication signals directly from at least one other RF device of the plurality of RF devices configured within the wireless communication network; and
a microprocessor operatively connected to the oscillator and the antenna,
wherein the microprocessor is operatively configured to determine when a first RF device of the at least one other RF device is out-of-service,
wherein the microprocessor is further configured to perform a recovery procedure to restore the first RF device to operation, and
wherein the recovery procedure includes
transmitting a hailing message via the antenna on a plurality of hailing channels to the first RF device,
transmitting the reference clock signal via the antenna on a first data channel to the first RF device, and
determining, by the first RF device, whether the reference clock signal causes a time shift greater than a predefined threshold,
wherein the first RF device is configured to perform a super sniffing mode for a predetermined time period, responsive to determining that the reference clock signal causes a time shift greater than the predefined threshold, the super sniffing mode comprising searching the plurality of hailing channels in a sequential mode for a hailing signal until the hailing signal is discovered from at least one other RF device.

12. The RF device of claim 11 , wherein the recovery procedure further includes receiving an acknowledge message from the first RF device on the first data channel.

13. The RF device of claim 11 , wherein the microprocessor determines the first RF device to be out-of-service when it fails to communicate for at least a predetermined length of time.

14. The RF device of claim 11 , wherein the microprocessor determines the first RF device to be out-of-service when the first RF device is newly installed within the wireless communication network to replace a non-functioning RF device.

15. The RF device of claim 11 , wherein the first RF device is in a sniffing mode.

16. The RF device of claim 11 , wherein no waiting period exists between each search of the plurality of hailing channels in the sequential mode.

17. A method of wirelessly communicating within a communication network, the method comprising the steps of:
communicating directly and wirelessly with at least one node of a plurality of nodes in the communication network;
determining when a first node of the at least one node is out-of-service, the first node being in a sniffing mode; and
performing a recovery procedure to restore the first node to operation, wherein the recovery procedure includes
transmitting a hailing message on a plurality of hailing channels to the first node,
transmitting a time synchronization signal to the first node,
determining, by the first node, whether the time synchronization signal causes a time shift greater than a predefined threshold, and
wherein the first node is configured to perform a super sniffing mode for a predetermined time period, responsive to determining that the time synchronization signal causes a time shift greater than the predefined threshold, the super sniffing mode comprising searching the plurality of hailing channels in a sequential mode for a hailing signal until the hailing signal is discovered from a parent node.

18. The method of claim 17 , wherein the step of determining when the first node is out-of-service includes the step of determining when the first node fails to communicate for at least a predetermined length of time.

19. The method of claim 17 , wherein the step of determining when the first node is out-of-service includes the step of determining when the first node is a new node configured to replace a non-functioning node.

20. The method of claim 17 , wherein no waiting period exists between each search of the plurality of hailing channels in the sequential mode.

Assignees

• Mueller Int Llc

Inventors

• Splitz David Edwin
• Shoesmith William Charles
• Grady Robert Henry

Classifications

• H04B17/318

  Received signal strength · CPC title

• H04W16/32

  Hierarchical cell structures · CPC title

• H04W24/04 Primary

  Arrangements for maintaining operational condition · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title