A Multi-Channel MAC Protocol for Wireless Sensor Networks

Chen xun, Han peng, He qiu-sheng, Tu shi-liang, Chen zhang-long

The Sixth IEEE International Conference on Computer and Information Technology

(CIT'06)

Outline

Introduction Multi-Channel MAC Protocol Simulation Conclusion

Introduction

Wireless sensor networks may consist of many different types– Low sampling rate magnetic, thermal, visual, infra

red, acoustic and radar

The radio bandwidth in WSNs is quite limited– IEEE 802.15.4 standard allows for use of multiple

channels available at the physical layer

Multi-Channel MAC Protocol

Assumption– N channels are available for use– The number of the data channel is N-1 the control

channel is one– Each sensor node is equipped with a half-duplex t

ransceiver

Multi-Channel MAC Protocol

Multi-Channel MAC Protocol

The cluster heads need to negotiate to reserve a Contact-Time for inter-cluster-head communication

Multi-Channel MAC Protocol

After established the clusters– The cluster head broadcast the synchronous infor

mation

Multi-Channel MAC Protocol

The active period is divided into four stages– Synchronous beacon– Transmission request– Channel schedule and – Data convey respectively

Multi-Channel MAC Protocol

Synchronous beacon stage– The cluster heads transmit the synchronous beac

on signal on the control channel The sensor nodes can adjust their wakeup clocks

Multi-Channel MAC Protocol

Transmission request stage– The cluster head switches to the listening mode o

n the control channel– Transmission requested stage is divided into man

y time slots

Multi-Channel MAC Protocol

Schedule stage– The cluster head collects all the request informati

on from the member node– The cluster heads distribute channels for the sour

ce node and destination node– Broadcast the channel assignment information pa

ckets on the control channel

Multi-Channel MAC Protocol

Data delivery stage– If a node is assigned the channel resource they w

akeup to exchange the message on the appointed channel

– Otherwise, the node has to keep sleep state throughout the whole data delivery stage

Multi-Channel MAC Protocol

For broadcast– The cluster head will assign an appropriative

channel for source node– The cluster head should piggyback the broadcast

packet

Simulation

Simulation

Simulation

Simulation

Conclusion

Proposed a novel multi-channel MAC protocol for wireless sensor network application– Coordinator-based multi-channel MAC protocol– Reduces the network-wide idle

Thank you!!