Enhanced communication of data in wireless control area networks

• US 8,259,648 B2
• Filed: 01/18/2008
• Issued: 09/04/2012
• Est. Priority Date: 01/18/2008
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Pratapagiri, Kiran
• Primary Examiner(s): Hamza, Faruk
• Assistant Examiner(s): PHAM, TITO Q
• Application Number:
  US12/016,305
• Publication Number:
  US 20090185548A1
• Time in Patent Office: 1,691 Days
• Field of Search: None
• US Class Current: 370/328
• CPC Class Codes: A61B 2560/045 with a separable interface unit, e.g. for communication
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/0024 for multiple sensor units attached to the patient, e.g. using a body or personal area network
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/08 Detecting, measuring or recording devices for evaluating the respiratory organs A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/389 Electromyography [EMG]
• CPC Class Codes: A61B 5/398 Electrooculography [EOG], e.g. detecting nystagmus; Electroretinography [ERG]
• CPC Class Codes: H04W 8/20 Transfer of user or subscriber data
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for communicating data in a wireless control area network, where the wireless control area network includes one or more sensor nodes configured to facilitate acquisition of patient data and an access coordinator configured to facilitate acquisition of the patient data from the one or more sensor nodes, is presented. The method includes creating a correlation between one or more poll packets from an access coordinator and time of arrival of data at one or more sensor nodes. Systems and computer-readable medium that afford functionality of the type defined by this method is also contemplated in conjunction with the present technique.

Claims

1. A method for communicating data in a wireless control area network, wherein the wireless control area network comprises:

one or more sensor nodes configured to facilitate acquisition of patient data;

an access coordinator configured to facilitate acquisition of the patient data from the one or more sensor nodes;

the method comprising creating a correlation between one or more poll packets from an access coordinator and time of arrival of data at one or more sensor nodes,

wherein creating a correlation comprises;

transmitting a first beacon from the access coordinator to the one or more sensor nodes, wherein the first beacon is configured to indicate a start of a new communication cycle;

preparing data for transmission from the one or more sensor nodes to the access coordinator in response to the first beacon;

generating a first data frame, wherein the first data frame is indicative of a sensor node having data to transmit, and wherein the first data frame is configured to create the correlation between a poll packet arrival time and a data arrival time at the one or more sensor nodes;

transmitting the first data frame from at least one sensor node to the access coordinator;

transmitting a second beacon from the access coordinator to the sensor node transmitting the first data frame, wherein the second beacon is configured to initiate polling of data from the one or more sensor nodes; and

communicating data from the one or more sensor nodes to the access coordinator in response to the second beacon, wherein the second beacon is further configured to acknowledge receipt of the first data frame.

2. The method of claim 1, further comprising generating a revised polling sequence by moving a sender of the first data frame to the top of a predetermined polling sequence.

3. The method of claim 1, wherein transmitting the first data frame from a sensor node to the access coordinator further comprises:

verifying availability of a transmission channel prior to transmitting the first data frame; and

transmitting the first data frame from the sensor node to the access coordinator over the available transmission channel.

4. The method of claim 3, further comprising deferring transmission of the first data frame based on the availability of the transmission channel.

5. The method of claim 4, further comprising verifying receipt of a second beacon.

6. The method of claim 5, further comprising:

discarding the first data frame from the access coordinates; and

waiting for a poll packet from the access coordinator to transmit data to the access coordinator.

7. The method of claim 5, further comprising deferring transmission of data for a predetermined time interval.

8. The method of claim 1, further comprising enhancing a time period configured to increase a contention window.

9. The method of claim 8, wherein enhancing a time period configured to increase a contention window comprises allowing a sensor node a predetermined number of attempts to transmit the first data frame.

10. The method of claim 8, further comprising:

initializing the contention window to a predetermined value, wherein the contention window is configured to aid the sensor node in delaying retrying transmission of the first data frame to the access coordinator.

11. A system for communicating data in a wireless control area network, the system comprising:

one or more sensor nodes configured to facilitate acquisition of data;

wherein the one or more sensor nodes configured to;

prepare data for transmission from the one or more sensor nodes to an access coordinator in response to a first beacon transmitted from an access coordinator to the one or more sensor nodes, wherein the first beacon is configured to indicate a start of a new communication cycle;

generate a first data frame, wherein the first data frame is indicative of a sensor node having data to transmit, and wherein the first data frame is configured to create a correlation between a poll packet arrival time and a data arrival time at the one or more sensor nodes;

transmit the first data frame from at least one sensor node to an access coordinator;

communicate data from the one or more sensor nodes to an access coordinator in response to the second beacon;

an access coordinator configured to facilitate acquisition of data from the one or more sensor nodes, wherein the access coordinator is configured to;

transmit a first beacon to the one or more sensor nodes, wherein the first beacon is configured indicate a start of a new control cycle;

transmit a second beacon from the access coordinator to a sensor node transmitting the first data frame, wherein the second beacon is configured to;

initiate a polling cycle; and

acknowledge receipt of the first data frame.

12. The system of claim 11, wherein the one or more sensor nodes are further configured to:

verify availability of a transmission channel prior to transmitting the first data frame; and

transmit the first data frame from the sensor node to the access coordinator over the available transmission channel.

13. The system of claim 12, wherein the one or more sensor nodes are further configured to defer transmission of the first data frame based on the availability of the transmission channel.

14. The system of claim 13, wherein the one or more sensor nodes are further configured to enhance a time period configured to increase a contention window.

15. The system of claim 11, wherein the access coordinator is further configured to generate a revised polling sequence by moving a sender of the first data frame to the top of a predetermined polling sequence.

16. The system of claim 15, wherein the access coordinator is further configured to poll the one or more sensor nodes as per the revised polling sequence.

17. The system of claim 15, wherein the access coordinator is further configured to transmit a second data frame, wherein the second data frame is indicative of an end of the polling sequence.

18. The system of claim 16, further configured to wirelessly transmit the data from the one or more sensor nodes to the access coordinator.

19. A system for communicating data in a wireless control area network, the system comprising:

one or more sensor nodes configured to facilitate acquisition of data;

wherein the one or more sensor nodes module are configured to;

prepare data for transmission from the one or more sensor nodes to an access coordinator in response to a first beacon transmitted from an access coordinator to the one or more sensor nodes, wherein the first beacon is configured to indicate a start of a new communication cycle;

generate a first data frame, wherein the first data frame is indicative of a sensor node having data to transmit, mad wherein the first data frame is configured to create a correlation between a poll packet arrival time and a data arrival time at the one or more sensor nodes;

transmit the first data frame from at least one sensor node to an access coordinator; and

communicate data from the one or more sensor nodes to an access coordinator in response to a second beacon;

an access coordinator configured to facilitate acquisition of data from the one or more sensor nodes, wherein the access coordinator is configured to;

transmit a first beacon to the one or more sensor nodes, wherein the first beacon is configured to indicate a start of a new control cycle;

transmit a second beacon from the access coordinator to the sensor node transmitting the first data frame, wherein the second beacon is configured to;

initiate a polling cycle; and

acknowledge receipt of the first data frame.

20. A system for communicating data in a wireless control area network, the system comprising:

an access coordinator configured to facilitate acquisition of data from one or more sensor nodes, wherein the access coordinator is configured to;

transmit a first beacon to one or more sensor nodes, wherein the first beacon is configured indicate a start of a new control cycle;

transmit a second beacon from the access coordinator to a sensor node transmitting a first data frame, wherein the second beacon is configured to;

initiate a polling cycle; and

acknowledge receipt of the first data frame;

one or more sensor nodes configured to facilitate acquisition of data;

wherein the one or more sensor nodes are configured to;

prepare data for transmission from the one or more sensor nodes to the access coordinator in response to a first beacon transmitted from an access coordinator to the one or more sensor nodes, wherein the first beacon is configured to indicate a start of a new communication cycle;

generate a first data frame, wherein the first data frame is indicative of a sensor node having data to transmit, and wherein the first data frame is configured to create a correlation between a poll packet arrival time and a data arrival time at the one or more sensor nodes;

transmit the first data frame from at least one sensor node to the access coordinator; and

communicate data from the one or more sensor nodes to the access coordinator in response to the second beacon.

21. A computer readable medium comprising one or more non-transitory tangible media, wherein the one or more tangible media comprise:

code adapted to transmit a first beacon from an access coordinator to one or more sensor nodes in a wireless control area network, wherein the first beacon is configured to indicate a start of a new communication cycle;

code adapted to prepare data for transmission from the one or more sensor nodes to the access coordinator in response to the first beacon;

code adapted to generate a first data frame, wherein the first data frame is indicative of a sensor node having data to transmit, and wherein the first data frame is configured to create a correlation between a poll packet arrival time and a data arrival time at the one or more sensor nodes;

code adapted to transmit the first data frame from at least one sensor node to the access coordinator;

code adapted to transmit a second beacon from the access coordinator to the sensor node transmitting the first data frame, wherein the second beacon is configured to initiate polling of data from the one or more sensor nodes; and

code adapted to communicate data from the one or more sensor nodes to the access coordinator in response to the second beacon.