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Energy Efficient MAC Protocol with Power and Rate Control in Multi-rate ad hoc networks

Masaki Bandai, Satoshi Maeda, and Takashi Watanabe

Dept. of Computer Science, Shizuoka (靜岡 ) UniversityIEEE Vehicular Technology Conference, 2008

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Outline

Introduction Assumption Protocol Simulation Conclusion

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Introduction

Motivation Extending the life of battery is the

more important issue in the ad hoc network.

Direct?? Relay??

4

Introduction

S

A

DDATA

ACK

Direct

5

Introduction

S

A

D

DATADATA

ACK

Relay

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Assumption

Each node prepares a table that includes energy efficiency of all combinations of transmission power and rate.

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Protocol

Cisco Aironet 350

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Protocol

P0 is the maximum transmission power .

R0 is the base transmission rate.

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Protocol

E(Pi,Rj) is the energy consumption when transmission power Pi and rate Rj are adopted.

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Protocol

π(Pi,Rj) dBm is required power to receive a data.

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Protocol

When a node receives a control frame such as RTS, the node measures the received power.

Result = P dBm

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Protocol

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Protocol

S

A

DRTS

B

14

Protocol

S

A

D

Node D check the Sequence selection threshold Th dBm.

B

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Protocol

S

A

DRTR

PBackoff : 10

PBackoff : 3

B

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Protocol

S

A

D

PBackoff : 7

PBackoff : 0

CTR

B

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Protocol

S

A

D

B

DATADATA

ACK

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Protocol

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Protocol

NAV problem when a node receives a RTS or a

RTR,it sets Dnav.

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Protocol

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Protocol

We assume that number of priority levels is L (level 1 to L), maximum backoff time is Tmax slottime.

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Protocol

Result : 0.14

3

667.014.0

3

667.0)1( ll L=3 1l

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Protocol

L

TlT

L

Tl backoff

maxmax)1(

3

301

3

30)11( backoffT

30

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Simulation

Simulator in C# language

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Simulation

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Simulation

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Simulation

28

Simulation

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Simulation

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Simulation

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Conclusion

In this paper, a novel MAC protocol with transmission power and rate control has been proposed to realize high energy efficient data transmission.