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Implementation method for wireless sensor network energy-saving MAC (media access control)

A technology of wireless sensor and implementation method, which is applied in the directions of energy-saving ICT, wireless communication, energy consumption reduction, etc., which can solve the problems of large energy consumption, fixed duty cycle, significant transmission delay, etc., and achieve low energy consumption requirements and avoid energy consumption. Attrition and conflict reduction effects

Active Publication Date: 2012-12-19
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0003] This type of method requires nodes to perform intra-cluster synchronization periodically, and the energy consumption of additional nodes brought by synchronization cannot be ignored, so it has certain limitations in terms of energy saving.
The duty cycle of the SMAC protocol is fixed, and the sleep schedule needs to be updated regularly. When the network load is small, the energy consumed by synchronization is large
An improved version of SMAC uses an adaptive listening mechanism to reduce sleep latency by more than half, but the transmission delay caused by periodic sleep is still significant

Method used

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  • Implementation method for wireless sensor network energy-saving MAC (media access control)
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  • Implementation method for wireless sensor network energy-saving MAC (media access control)

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] DRMAC (Double Random Media Intervention Control Double Random MAC) protocol competition mechanism and backoff rules:

[0024] DRMAC is a WSN MAC protocol that adopts double random mode and medium asynchronous access. First of all, when a node has a data packet to send, it will perform carrier sense. After a period of time, if the channel is busy, it will back off for a period of time before monitoring. If the channel is idle, send RTS to the target node. Since the access method is asynchronous access, the source node does not know the sleep schedule of the target node, and cannot know the active time of the node. In order to allow the target node to After receiving the RTS, the source node needs to ensure that an RTS is sent within the active time of the target node. If the target node receives the RTS, it is ready to receive data and sends CTS. After receivin...

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Abstract

The invention provides an implementation method for wireless sensor network energy-saving MAC (media access control). The method comprises the following steps that carrier sense is carried out if a source node has data packets required to be sent: if the channel is busy, the carrier sense is carried out again after withdrawing a period of time; if the channel is idle, the source node sends an RTS (request to send) to a target node; after receiving the RTS, the target node makes data receiving preparation and sends a CTS (clear to send) to the source node; after receiving the CTS, the source node sends the data to the target node; after receiving the data, the target node returns an ACK (acknowledgement); and after receiving the ACK, the source node continues transmitting data and the target node returns ACK until the data is transmitted. The MAC protocol provided by the invention has the characteristics of random sleep mechanism, asynchronous access, random RTS and the like; the energy loss brought by synchronization is avoided; and the conflicts caused by RTS is reduced, and 1 / 2 of delay is reduced compared with that of SMAC (sleep media access control).

Description

technical field [0001] The present invention relates to the technical field related to wireless sensor networks, in particular to a new energy-saving MAC (Media Access Control) implementation method for wireless sensor networks. Background technique [0002] The typical protocol SMAC (Sleep Media Access Control) using the node periodic sleep mechanism, its basic idea is: the node periodically sleeps to reduce idle monitoring, and after waking up, monitors the channel through the physical / virtual carrier to determine whether the channel is idle or needs to receive data. Nodes with the same sleep cycle table form a virtual cluster, and the cluster head periodically synchronizes the sleep schedule of the cluster, which not only ensures the synchronization of adjacent node scheduling cycles, but also satisfies scalability. In order to avoid conflicts and crosstalk, SMAC uses physical / virtual carrier monitoring and handshake RTS / CTS (Request to Send / Clean To Send) mechanism simil...

Claims

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Application Information

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IPC IPC(8): H04W52/02H04W74/08H04L1/16
CPCY02B60/50Y02D30/70
Inventor 张钦宇王亚松李云鹤林威
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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