25-06-2013, 04:02 PM
Novel Sleep Scheduling To Reduce Broadcasting Delay For Critical Event Monitoring in Wireless Sensor Networks
Novel Sleep Scheduling.pptx (Size: 2.79 MB / Downloads: 31)
AGENDA
To develop a ‘novel sleep scheduling method to reduce the delay of alarm broadcasting’ from any sensor node in Wireless Sensor Networks.
Design two determined traffic paths for the transmission of alarm message, and level-by-level offset based wake-up pattern according to the paths, respectively.
INTRODUCTION
OVERVIEW OF TECHNOLOGY
Wireless technology is largely and increasingly beneficial for industry.
The challenge is to maintain each node in a cost, complexity and energy perspective. Most difficult is to replace the battery of each node in wide area network.
IEEE 802.15
IEEE 802.15.1
WPAN [802.15.3]
WPAN (LR-WPAN) [802.15.4]
DEFNITION OF WSN:
Wireless Sensor Networks (WSN) are composed of many tiny, low-cost, low-power and scattered devices called sensor nodes.
Each node integrates a processor, memory, transceiver and power source in one small device.
They has the ability to observe, process and send data about observed phenomenon to its neighboring nodes destined to a central processing unit sometimes referred to as a sink.
PROBLEM DEFINITION:
Here, we assume that a certain node, called as center node, in the network has obtained the network topology in the initialization (e.g., sink node). The center node computes the sleep scheduling according to the proposed scheduling scheme and broadcasts the scheduling to all the other nodes. Some of the following terms are defined here.
Event detectionequipped with passive event detection capabilities)
Slot and duty cycle
Existing System
Sleep scheduling is an usual way for power management to save energy. Recently, many sleep schedules for event monitoring have been designed. Most of them focus on minimizing energy consumption.
Broadcasting delay is imp issue (should be minimum). Based on this idea, a level-by-level offset schedule is used to achieve low transmission delay.
Though existing sleep scheduling algorithms save energy, they lead to a large increase in end-to-end latency .
Q-MAC sleep schedule.
Proposed system
The proposed scheme is based on the level-by-level offset schedule, to achieve low broadcasting delay in a large scale WSN. The proposed scheduling method includes two phases:
Any node which detects a critical event sends an alarm packet to the center node along a predetermined path according to level-by-level offset schedule.
The center node broadcasts the alarm packet to the entire network also according to level-by-level offset schedule.
Conclusion
The proposed sleeping scheduling scheme could essentially decrease the delay of alarm broadcasting from any node in Wireless Sensor Networks.
The upper bound of the delay is 3