Method for controlling media access in wireless sensor network

• US 20070019604A1
• Filed: 04/28/2006
• Published: 01/25/2007
• Est. Priority Date: 05/31/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chang, Ki-seok, Hur, Kyeong, Kang, Chung-gu, Kim, Ii-whan
• Application Number:
  US11/412,829
• Publication Number:
  US 20070019604A1
• Time in Patent Office: Days
• US Class Current: 370/347
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 74/02 Hybrid access
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

A media access control method of a wireless sensor network (WSN) is provided. The media access control method includes first sensor nodes, existing in a non-overlapping area where clusters do not overlap, media-accessing with a Time Division Multiple Access (TDMA) method and communicating with a Cluster head (CH) in a first section. Further, and the method includes second sensor nodes, existing in an overlapping area where the clusters overlap, media-accessing with a contention-based method and communicating with the CH in a second section. Because communication between nodes of the non-overlapping area where the clusters do not overlap, uses a reservation-based TDMA method, collision between nodes can be prevented, and because communication between nodes of the overlapping area where the clusters overlap, uses a contention-based CSMA/CA method, interference between neighboring clusters can be prevented.

Claims

1. A media access control method of a wireless sensor network (WSN), the media access control method comprising:

first sensor nodes, existing in a non-overlapping area where clusters do not overlap, media-accessing with a Time Division Multiple Access (TDMA) method and communicating with a Cluster head (CH) in a first section; and

second sensor nodes, existing in an overlapping area where the clusters overlap, media-accessing with a contention-based method and communicating with the CH in a second section.

2. The media access control method of claim 1, wherein in the communicating operation in the second section, the CH, a gateway (GW) and the second sensor nodes existing in the overlapping area media-access with the contention-based method and communicate using at least one of the CH and the GW.

3. The media access control method of claim 1, further comprising:

the CH, transferring a beacon and a query to a gateway (GW), the first sensor nodes existing in the non-overlapping area, and the second sensor nodes existing in the overlapping area in a third section; and

the GW, transferring the beacon and the query received from the CH to a neighboring CH in a fourth section, the neighboring CH being a CH of a neighboring cluster.

4. The media-access control method of claim 3, wherein the first to fourth sections are arranged in a frame in the order of the third section, the first section, the fourth section and the second section.

5. The media-access control method of claim 3, further comprising placing the sensor nodes existing in the non-overlapping area in a sleep state in the second and the fourth sections.

6. The media-access control method of claim 5, further comprising placing the sensor nodes existing in the non-overlapping area in a sleep state in the first section when there is no data to send to the CH.

7. The media-access control method of claim 3, further comprising placing the sensor nodes existing in the overlapping area in a sleep state in the first and the fourth sections.

8. The media-access control method of claim 7, further comprising placing the sensor nodes existing in the overlapping area in a sleep state in the second section when there is no data to send to the CH.

9. The media-access control method of claim 3, further comprising placing the GW is in a sleep state in the first section.

10. The media-access control method of claim 9, further comprising placing the GW is in a sleep state in the second section when there is no data to send to the CH in the second section.

11. The media-access control method of claim 3, wherein the CH media-accesses in an allocated slot of the third section and transfers the beacon and the query.

12. The media-access control method of claim 3, wherein the GW media-accesses in an allocated slot of the fourth section and transfers the beacon and the query.

13. The media-access control method of claim 1, wherein the sensor nodes existing in the non-overlapping area media-access in respectively allocated slots of the first section and communicate with the CH.