METHOD FOR CHANNEL MANAGEMENT AND DATA TRANSMISSION IN WIRELESS SENSOR NETWORK

• US 20150036620A1
• Filed: 07/29/2014
• Published: 02/05/2015
• Est. Priority Date: 07/31/2013
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: LEE, Jun Hee, JEONG, Wun-Cheol
• Granted Patent: US 9,544,908 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

A method for dynamically managing wireless channels to minimize channel interference between heterogeneous wireless devices, and transmitting data by effectively using channels, is provided. Interference between heterogeneous wireless networks is avoided in a channel hopping mode, whereby a data transmission success rate of the wireless sensor network is enhanced, thus enhancing reliability of data transmission.

Claims

1. A method for managing channel of a reception node included in a wireless sensor network, the method comprising:

when a data frame is not received in at least one of a plurality of channels used in the wireless sensor network, counting the number of times of not receiving a data frame;

when the number of times of not receiving a data frame from a first transmission node through a first channel among a plurality of channels is n, changing a state of the first channel into an unavailable state; and

informing the first transmission node about the unavailable state of the first channel through a second channel among the plurality of channels.

2. The method of claim 1, wherein the changing of the state of the first channel into the unavailable state comprises:

changing the state of the first channel in a channel table stored in a reception node; and

generating an unavailable channel bitmap through the channel table.

3. The method of claim 2, wherein the informing of the first transmission node about the unavailable state of the first channel comprises:

after the state of the first channel is changed into the unavailable state, receiving a data frame from the first transmission node through the second channel; and

informing the first transmission node about the unavailable state of the first channel by using an ACK frame with respect to the received data frame.

4. The method of claim 3, wherein the informing about the unavailable state of the first channel by using the ACK frame comprises

including a black channel count value indicating a time at which the unavailable state of the first channel is to be initialized and the unavailable channel bitmap in the ACK frame and transmitting the ACK frame to the first transmission node.

5. The method of claim 2, wherein after the changing of the state of the first channel into the unavailable state,

when a pre-determined time has lapsed, counting according to a black channel count value indicating a time at which the unavailable state of the first channel is to be initialized.

6. The method of claim 4, wherein the black channel count value is indicated by a guaranteed time slot (GTS) of the data frame.

7. The method of claim 5, wherein the black channel count value is indicated by a guaranteed time slot (GTS) of the data frame.

8. The method of claim 5, further comprising,

after the counting,

when a data frame is received through the second channel different from the first channel among the plurality of channels from a second transmission node that shares the first channel with the first transmission node, informing the second transmission node about the unavailable state of the first channel by using an ACK frame with respect to the received data frame.

9. The method of claim 8, wherein the informing of the second transmission node about the unavailable state of the first channel comprises

including the unavailable channel bitmap and the black channel count value in the ACK frame and transmitting the ACK frame to the second node.

10. The method of claim 8, further comprising,

after the counting:

when a data frame is received through the first channel from a transmission node, other than the first transmission node, before the counting is finished, changing the state of the first channel into an available state; and

informing the first transmission node and the second transmission node about the available state of the first channel.

11. The method of claim 8, further comprising,

after the counting,

when a data frame is not received through the first channel before the counting is finished, changing a state of the first channel into an available state after the counting is finished.

12. The method of claim 10, further comprising

initializing black channel counting, after the changing of the state of the first channel into an available state.

13. The method of claim 11, further comprising

initializing black channel counting, after the changing of the state of the first channel into an available state.

14. A method for transmitting data by a transmission node included in a wireless sensor network, the method comprising:

determining a channel hopping sequence in consideration of a band size of a single channel used in a different wireless network using a frequency band the same as that of the wireless sensor network;

receiving a bitmap indicating a state of a plurality of channels used in the wireless sensor network; and

transmitting data through a channel indicated as an available state in the bitmap according to the channel hopping sequence.

15. The method of claim 14, wherein the channel hopping sequence is determined such that when a band size of a single channel used in the different wireless network corresponds to a band size of n number of channels used in the wireless sensor network, an interval between channels to be allocated to two adjacent time slots is equal to or greater than an interval of the n number of channels.

16. The method of claim 15, wherein the channel hopping sequence is received from a coordinator included in the wireless sensor network.

17. The method of claim 15, wherein the channel hopping sequence is received from a node of a higher layer of a transmission node when the wireless sensor network has a hierarchical structure.

18. The method of claim 14, wherein the receiving of the bitmap comprises,

when a state of at least one of a plurality of channels is indicated as an unavailable state in the bitmap, receiving a black channel count value indicating a time at which the unavailable state of the unavailable channel is to be initialized.

19. The method of claim 18, wherein the transmitting of data comprises

not transmitting data through the unavailable channel in spite of the channel hopping sequence during black channel counting according to the black channel count value.