A Cooperative Lifetime Extension MAC Protocol in Duty Cycle Enabled

Wireless Sensor NetworksHongzhi Jiaot, Mary Ann Ingram, Frank Y. Li

Milcom 2011

Introduction Problem Goal Proposed protocol

CDC-MAC Simulation Conclusion

Outline

Duty cycle Long Network Lifetime

Introduction

Dormant State Active state

Duty cycle MAC Synchronous

S-MAC DW-MAC

Asynchronous RI-MAC

Introduction

Cooperative transmission works only when there are mul tiple active neighboring senders Successful transmission of the necessary control messages and

copies of the data Ex. OC-MAC

Introduction

Problem

C D E

B

A

Using virtual multiple-input-single-output(MISO) transmission

Problem

C D E

B

A

Cooperative transmission

We also discuss the main goals and challenges of integrating cooperative transmission into a duty cycle MAC protocol Balance the energy consumption

Goal

CDC-MAC Rendezvous selection for data transmission

Phase 1: network initialization and rendezvous Phase 2: Data transmission

Energy-Balance-Oriented scheduling CDC-MAC-1 CDC-MAC-2

Proposed protocol

CDC-MAC

C D

B

A

Rendezvous selection for data transmission Phase 1: network initialization and rendezvous

CDC-MAC

C

D

B

Sync ACK Active window

ACK

ACK

Sync Sync

WB,0 WB,1 WB,2 WB,3 WB,0

CDC-MAC

C

D

BWB,0 WB,1

WA,1

A

WB,0

WA,1

Rendezvous selection for data transmission Phase 2: Data transmission (Non-cooperative transmission)

CDC-MAC-1

C

D

BWB,0 WB,1

WA,1

A

WB,0

WA,1

Data transmission Cooperative decision and competition for channel access

Energy-Balance-Oriented scheduling CDC-MAC (regular transmission)

CDC-MAC-1

Rendezvous selection for data transmission Phase 2: Data transmission (cooperative transmission)

CDC-MAC-1

C

D

BWB,0

WA,1

A

Data transmission Cooperative decision and competition for channel access

Energy-Balance-Oriented scheduling CDC-MAC (cooperative transmission)

CDC-MAC-1

Energy-Balance-Oriented scheduling CDC-MAC-2 (cooperative transmission)

Residual energy

CDC-MAC-2

Area: 500 m x 250m The energy consumption ratios: 0:1:1.05:1.4

(sleep:idle:reception:transmission)

Simulation

OC-MAC

Simulation

Simulation

Simulation

In this paper, a cooperative duty cycle MAC protocol CDC-MAC has been proposed to extend the network lifetime of WSNs Balance energy consumption Prolong network lifetime

Conclusion