Slot segregation for supporting multiple communication protocols in an industrial wireless network

Patent metadata

Field	Value
Publication number	US-9544081-B2
Application number	US-201313871897-A
Country	US
Kind code	B2
Filing date	Apr 26, 2013
Priority date	Apr 26, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A method includes dividing a Time Division Multiple Access (TDMA) structure into a plurality of first time slots and a plurality of second time slots. The first and second time slots are allocated to communications using first and second protocols, respectively. The method also includes communicating with at least one first wireless device using the first protocol during the first time slots. The method further includes communicating with at least one second wireless device using the second protocol during the second time slots.

First claim

What is claimed is:

1. A method comprising:
dividing a Time Division Multiple Access (TDMA) structure into a plurality of first time slots and a plurality of second time slots, the first and second time slots allocated to communications using first and second protocols associated with an industrial process control system, respectively;
routing, by a protocol routing layer, each of a plurality of data packets to a first protocol stack associated with the first protocol or a second protocol stack associated with the second protocol;
transmitting, by a physical layer, a first subset of the data packets to at least one first wireless device using the first protocol during the first time slots and not during the second time slots; and
transmitting, by the physical layer, a second subset of the data packets to at least one second wireless device using the second protocol during the second time slots and not during the first time slots;
wherein the TDMA structure comprises a superframe having multiple frames, each frame including multiple time slots, each frame containing only one of the first time slots or the second time slots.

2. The method of claim 1 , wherein:
the first protocol comprises an ISA100 protocol; and
the second protocol comprises a Wireless Highway Addressable Remote Transducer (WHART) protocol.

3. The method of claim 1 , further comprising:
dynamically allocating the frames to the protocols based on a percentage of wireless devices that use the first protocol and a percentage of wireless devices that use the second protocol.

4. The method of claim 1 , wherein the first and second time slots have different lengths; and
at least one time slot in at least one of the frames is extended to encompass remaining time in the at least one frame.

5. The method of claim 1 , further comprising:
obtaining the plurality of data packets; and
identifying, by the protocol routing layer, which protocol is associated with each data packet.

6. The method of claim 5 , wherein identifying which protocol is associated with each data packet comprises using at least one of:
a device type of a device generating the data packet; and
contents of the data packet.

7. The method of claim 1 , wherein the at least one first wireless device and the at least one second wireless device comprise at least one of: a field instrument and a router.

8. An apparatus comprising:
a transceiver comprising a physical layer, the physical layer configured to communicate with wireless devices in different time slots of a Time Division Multiple Access (TDMA) structure, the TDMA structure including a plurality of first time slots and a plurality of second time slots, the first and second time slots to be respectively allocated to communications using first and second protocols associated with an industrial process control system; and
a protocol routing layer configured to route each of a plurality of data packets to a first protocol stack associated with the first protocol or a second protocol stack associated with the second protocol;
wherein the physical layer is configured to transmit a first subset of the data packets to at least one first wireless device using the first protocol during the first time slots and not during the second time slots;
wherein the physical layer is configured to transmit a first subset of the data packets to at least one second wireless device using the second protocol during the second time slots and not during the first time slots; and
wherein the TDMA structure comprises a superframe having multiple frames, each frame including multiple time slots, each frame containing only one of the first time slots or the second time slots.

9. The apparatus of claim 8 , wherein:
the first protocol comprises an ISA100 protocol; and
the second protocol comprises a Wireless Highway Addressable Remote Transducer (WHART) protocol.

10. The apparatus of claim 8 , wherein the transceiver is configured to dynamically allocate the frames to the protocols based on a percentage of the wireless devices that use the first protocol and a percentage of the wireless devices that use the second protocol.

11. The apparatus of claim 8 , wherein the first and second time slots have different lengths; and
at least one time slot in at least one of the frames is extended to encompass remaining time in the at least one frame.

12. The apparatus of claim 8 , wherein the protocol routing layer is further configured to:
obtain the plurality of data packets; and
identify which protocol is associated with each data packet.

13. The apparatus of claim 12 , wherein the protocol routing layer is configured to identify which protocol is associated with each data packet using at least one of:
a device type of a device generating the data packet; and
contents of the data packet.

14. The apparatus of claim 8 , wherein the physical layer is configured to communicate with at least one of: a field instrument and a router.

15. The apparatus of claim 8 , wherein the frames containing the first time slots are interleaved with the frames containing the second time slots.

16. The apparatus of claim 8 , wherein half of the frames include only the first time slots and half of the frames include only the second time slots.

17. A non-transitory computer readable medium embodying a computer program, the computer program comprising computer readable program code for:
dividing a Time Division Multiple Access (TDMA) structure into a plurality of first time slots and a plurality of second time slots, the first and second time slots allocated to communications using first and second protocols associated with an industrial process control system, respectively;
routing, by a protocol routing layer, each of a plurality of data packets to a first protocol stack associated with the first protocol or a second protocol stack associated with the second protocol;
transmitting, by a physical layer, a first subset of the data packets to at least one first wireless device using the first protocol during the first time slots and not during the second time slots; and
transmitting, by the physical layer, a second subset of the data packets to at least one second wireless device using the second protocol during the second time slots and not during the first time slots;
wherein the TDMA structure comprises a superframe having multiple frames, each frame including multiple time slots, each frame containing only one of the first time slots or the second time slots.

18. The computer readable medium of claim 17 , wherein:
the first protocol comprises an ISA1500 protocol; and
the second protocol comprises a Wireless Highway Addressable Remote Transducer (WHART) protocol.

19. The computer readable medium of claim 17 , wherein the computer program further comprises computer readable program code for:
dynamically allocating the frames to the protocols based on a percentage of wireless devices that use the first protocol and a percentage of wireless devices that use the second protocol.

20. The computer readable medium of claim 17 , wherein the first and second time slots have different lengths; and
at least one time slot in at least one of the frames is extended to encompass remaining time in the at least one frame.

21. The computer readable medium of claim 17 , wherein the computer program further comprises computer readable program code for:
obtaining the plurality of data packets; and
identifying, by the protocol routing layer, which proto

Assignees

• Samudrala Prasad
• Chernoguzov Alexander
• Kolavennu Soumitri N
• Raravi Channabasavaraj
• Honeywell Int Inc

Inventors

• Samudrala Prasad
• Chernoguzov Alexander
• Kolavennu Soumitri N
• Raravi Channabasavaraj

Classifications

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/12 Primary

  Wireless traffic scheduling · CPC title

• H04J3/1694 Primary

  Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062) · CPC title