atma: advertisement-based tdma protocol for bursty traffic in wireless sensor networks surjya ray,...

ATMA: Advertisement-based TDMA Protocol for Bursty Traffic in Wireless Sensor NetworksSurjya Ray, Illker Demirkol, and Wendi Heinzeleman

University of Rochester

IEEE GLOBECOM 2010

1

Outline

IntroductionAdvertisement-based TDMA (ATAM)SimulationsConclusion

2

Introduction

Energy conservation is one of the primary goal for wireless sensor networks(WSNs).

The major cause of energy wasting is idle listening.

3

Introduction

TDMA – based◦High energy efficient◦Need Synchronization◦Not easy dynamically change the frame length

Contention – based◦S-MAC◦T-MAC

4

Introduction

S-MAC

T-MAC

5

T-MAC

Activation event◦The reception of any data on the radio

◦The sensing of communicational on the radio

◦The knowledge, through overhearing prior RTS and CTS packets, that a data exchange of a neighbor has ended

6

Introduction

T-MAC still waste energy◦Idle listening

Advertisement-based TDMA (ATMA)◦Variable traffic loading◦Reduce Idle listening

7

ATMA

Overview

SYN

C

Frame length

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The Advertisement Period

Divided into many small slotsAll nodes are awaked

Advertisement Period

AD

V

Sensor ID and data slots

A-

Ack

S R

9

The Advertisement Period

S R

C

D

E

Initial Slot Selection:

Actual Contention:

S,E

D D

AD

V A-

Ack AD

V A-

Ack

AD

V

FF F

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The Data Period

Divided into slotsAll nodes will sleep until

◦Sending ◦Receiving

Data Period

S R

DA

TA

AC

K

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DA

TA

AC

K

AC

K

The Data Period

Data Period

S RD

AT

A

12

Sender can reserve n data slots

Simulations

Parameters Values

NS-2 2.29

Duration of ADV period of ATMA 5ms

Duration of one ADV slot 0.1ms

Duration of frames 236.4ms

Transmission range 100m

Carrier Sense range 200m

Total simulation time 200s

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Simulations

Single hop◦20 nodes and area size : 50*50m

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Simulations

Multi-hop◦312 nodes and area size is 700*700m

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Conclusion

The simulation results shows that ATAM outsperforms than other related works.

In the future, the authors will plan an analytical model for the ATMA and to optimize the length for the ATMA period of ATMA.

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