Scalable packets in a frequency hopping spread spectrum (FHSS) system

• US 8,861,565 B2
• Filed: 02/21/2012
• Issued: 10/14/2014
• Est. Priority Date: 02/21/2012
• Status: Active Grant

• Current Assignee: Elster Solutions LLC (Honeywell International Inc.)
• Original Assignee: Elster Solutions LLC (Honeywell International Inc.)
• Inventors: Shuey, Kenneth C., Hemminger, Rodney C.
• Primary Examiner(s): LEE, SIU M
• Application Number:
  US13/356,903
• Publication Number:
  US 20130215932A1
• Time in Patent Office: 966 Days
• Field of Search: 375/132, 375/133, 375/135, 375/136, 375/316, 375/295
• US Class Current: 375/133
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04Q 2209/25 using a mesh network, e.g. a public urban network such as public lighting, bus stops or traffic lights
• CPC Class Codes: H04Q 2209/60 for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

A wireless mesh network, method, and processor-readable storage medium for operating a network are disclosed. In particular, methods are disclosed for operating a wireless mesh network to increase the number of frequency channels used by the system without needing to increase the preamble length. According to various embodiments, a wireless mesh network divides the ISM spectrum into two types of channels: acquisition channels and data channels. An acquisition channel is used to transmit a preamble of a communication packet. One or more data channels are used to transmit a data portion of the communication packet.

Claims

1. A wireless network comprising:

a transmitting communication node communicating a communication packet comprising a preamble portion communicated on a dedicated acquisition channel of a frequency spectrum and a data portion communicated on at least one dedicated data channel of the frequency spectrum; and

a receiving communication node that receives the communication packet from the transmitting communication node,

wherein the frequency spectrum is divided into a set of dedicated acquisition channels and a set of dedicated data channels, wherein a length of the preamble portion is determined based at least in part on a data packet length associated with the communication packet and a number of acquisition channels in the set of dedicated acquisition channels.

2. The wireless network of claim 1, wherein the number of dedicated acquisition channels in the set of dedicated acquisition channels is selected to minimize the length of the preamble portion while maintaining substantially equal channel utilization.

3. The wireless network of claim 1, wherein the transmitting communication node is a battery-powered device, and wherein a subset of the set of dedicated acquisition channels is dedicated to battery-powered devices.

4. The wireless network of claim 1, wherein the number of dedicated acquisition channels in the set of dedicated acquisition channels and a number of dedicated data channels in the set of dedicated data channels are selected as a function of a length of the communication packet to maintain substantially equal channel utilization.

5. The wireless network of claim 1, wherein the preamble portion and the data portion of the communication packet are communicated at different data rates or with different modulation schemes.

6. The wireless network of claim 1, further comprising a control node, an electrical device in coarse synchronization with the control node and a battery-powered device that is not in synchronization with the control node.

7. The wireless network of claim 1, wherein a number of dedicated acquisition channels in the set of dedicated acquisition channels is selected based at least in part on the length of the preamble portion.

8. A method for communication of a communication packet comprising a preamble portion and a data portion, the method comprising:

transmitting the preamble portion of the communication packet on a dedicated acquisition channel of a frequency spectrum; and

transmitting the data portion of the communication packet on at least one dedicated data channel of the frequency spectrum,

wherein the frequency spectrum is divided into a set of dedicated acquisition channels and a set of dedicated data channels, wherein a length of the preamble portion is determined based at least in part on a data packet length associated with the communication packet and a number of acquisition channels in the set of dedicated acquisition channels.

9. The method of claim 8, wherein a number of dedicated acquisition channels in the set of dedicated acquisition channels is selected based at least in part on the length of the preamble portion.

10. The method of claim 8, wherein the number of dedicated acquisition channels in the set of dedicated acquisition channels is selected to minimize the length of the preamble portion while maintaining substantially equal channel utilization.

11. The method of claim 8, wherein a subset of the set of dedicated acquisition channels is dedicated to battery-powered devices.

12. The method of claim 8, wherein the number of dedicated acquisition channels in the set of dedicated acquisition channels and a second number of dedicated data channels in the set of dedicated data channels are selected as a function of a length of the communication packet to maintain substantially equal channel utilization.

13. The method of claim 8, wherein the preamble portion and the data portion of the communication packet are transmitted at different data rates or with different modulation schemes.

14. The method of claim 8, wherein the frequency spectrum is an Industrial, Scientific, and Medical (ISM) frequency spectrum.

15. A wireless network comprising:

a transmitting communication node communicating a communication packet comprising a preamble portion communicated on a dedicated acquisition channel of a frequency spectrum and a data portion communicated on at least one dedicated data channel of the frequency spectrum; and

a receiving communication node that receives the communication packet from the transmitting communication node,

wherein the frequency spectrum is divided into a set of dedicated acquisition channels and a set of dedicated data channels, wherein the transmitting communication node is a battery-powered device, and wherein a subset of the set of dedicated acquisition channels is dedicated to battery-powered devices.

16. The wireless network of claim 15, wherein the preamble portion and the data portion of the communication packet are communicated at different data rates or with different modulation schemes.

17. The wireless network of claim 15, further comprising a control node and an electrical device in coarse synchronization with the control node, wherein the transmitting communication node is not in synchronization with the control node.