INTELLIGENT WIRING IN A LOW POWER AND LOSSY NETWORK

• US 20150200738A1
• Filed: 01/15/2014
• Published: 07/16/2015
• Est. Priority Date: 01/15/2014
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Wetterwald, Patrick, Thubert, Pascal, Ribiere, Vincent J., Vasseur, Jean-Philippe
• Granted Patent: US 9,413,479 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04J 3/16 in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted H04J3/17, H04J3/24 take precedence
• CPC Class Codes: H04L 2012/40208 characterized by the use of a particular bus standard
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 84/10 Small scale networks; Flat hierarchical networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In one embodiment, the locations of a plurality of network devices in a low power and lossy network (LLN) are determined along an intelligent wire. One or more neighboring devices for each network device in the plurality are identified based on the locations of the network devices along the intelligent wire. A communication schedule for the network devices is determined that prevents neighboring devices along the intelligent wire from transmitting on the same frequency. The network devices are assigned to communication time slots based on the communication schedule. The network devices are also assigned frequency offsets based on the communication schedule.

Claims

1. A method, comprising:

determining, for a plurality of network devices in a low power and lossy network (LLN), locations of the network devices along an intelligent wire;

identifying one or more neighboring devices for each network device in the plurality based on the locations of the network devices along the intelligent wire;

determining a communication schedule for the network devices that prevents neighboring devices along the intelligent wire from transmitting on the same frequency;

assigning the network devices to communication time slots based on the communication schedule; and

assigning frequency offsets to the network devices based on the communication schedule.

2. The method as in claim 1, wherein the network devices along the intelligent wire comprise sensor access points.

3. The method as in claim 1, wherein the network devices along the intelligent wire comprise Wi-Fi access points.

4. The method as in claim 1, wherein the network devices along the intelligent wire comprise light emitting diode (LED) access points.

5. The method as in claim 1, further comprising:

detecting a faulty network device along the intelligent wire; and

increasing transmission power of the one or more neighboring devices of the faulty network device.

6. The method as in claim 1, wherein the network devices are located along the intelligent wire at fixed distances from one another.

7. The method as in claim 1, further comprising:

detecting, at one of the network devices, a wireless transmission sent to a neighboring device of the network device; and

forwarding the transmission to the neighboring device via the intelligent wire.

8. The method as in claim 1, further comprising:

supplying power to the network devices using the intelligent wire.

9. The method as in claim 1, wherein at least some of the network devices comprise passive sensors configured to monitor a frequency band, the method further comprising:

detecting, via the passive sensors, the location of a remote device that is not coupled to the intelligent wire.

10. The method as in claim 9, further comprising:

determining that the remote device is an unauthorized device.

11. The method as in claim 1, further comprising:

receiving serial numbers from the network devices, wherein the serial numbers sequentially appear along the intelligent wire; and

using the serial numbers to determine the locations of the network devices and the intelligent wire.

12. An apparatus, comprising:

one or more network interfaces to communicate with low power and lossy network (LLN) devices located along an intelligent wire;

a processor coupled to the network interfaces and adapted to execute one or more processes; and

a memory configured to store a process executable by the processor, the process when executed operable to;

determine, for the LLN devices, locations of the devices along the intelligent wire;

identify one or more neighboring devices for each LLN device based on the locations of the devices along the intelligent wire;

determine a communication schedule for the LLN devices that prevents neighboring devices along the intelligent wire from transmitting on the same frequency;

assign the LLN devices to communication time slots based on the communication schedule; and

assign frequency offsets to the LLN devices based on the communication schedule.

13. The apparatus as in claim 12, wherein the process when executed is further operable to:

detect a faulty network device along the intelligent wire; and

increase transmission power of the one or more neighboring devices of the faulty network device.

14. The apparatus as in claim 12, wherein the network devices are located along the intelligent wire at fixed distances from one another.

15. The apparatus as in claim 12, wherein the process when executed is further operable to:

detect, at one of the LLN devices, a wireless transmission sent to a neighboring device of the LLN device; and

forward the transmission to the neighboring device via the intelligent wire.

16. The apparatus as in claim 12, further comprising:

a power supply configured to power to the network devices using the intelligent wire.

17. The apparatus as in claim 12, wherein at least some of the network devices comprise passive sensors configured to monitor a frequency band, and wherein the process when executed is further operable to:

detect, via the passive sensors, the location of a remote device that is not coupled to the intelligent wire.

18. The apparatus as in claim 17, wherein the process when executed is further operable to:

determine that the remote device is an unauthorized device.

19. The apparatus as in claim 12, wherein the process when executed is further operable to:

receive serial numbers from the network devices, wherein the serial numbers sequentially appear along the intelligent wire; and

use the serial numbers to determine the locations of the network devices and the intelligent wire.

20. An apparatus comprising:

an intelligent wire; and

low power and lossy network (LLN) devices located along the intelligent wire at fixed distances from one another.

21. The apparatus as in claim 20, wherein the intelligent wire is configured to provide a communication medium between the LLN devices located along the intelligent wire.

22. The apparatus as in claim 20, wherein the LLN devices are selected from a group comprising:

wireless access points and sensors.

23. The apparatus as in claim 20, wherein the intelligent wire is configured to power the LLN devices.