Broadcast Enhanced Cooperative Asynchronous Multichannel MAC for Wireless Ad Hoc Network

WAN YunHeng, CHEN Xi, LU JianHua

Electronics Engineering Department

Tsinghua University Beijing, China

IEEE Wicom 2011

Outline

• Introduction• BMAC• Simulation• Conclusion

Introduction

• Increase wireless network capacity–Multiple channels– Broadcast specific data to a group receivers• Real time video• Sending notice• Advertisement message

Introduction

• Multiple channel– Good use of frequency resources– Increase the aggregate throughput

Introduction

• CAM-MAC– A single half-duplex transceiver– Control channel

Tie Luo, Mehul Motani, Vikram Srinivasan, Cooperative Asynchronous-Multichannel MAC: Design, Analysis, and Implementation, IEEE trans-action on mobile computing, Vol. 8, No. 3, March 2009

Introduction

• CAM-MAC

Time

transmitter

receiver

transmitter’sneighbor

receiver’sneighbor

PRA

PRA

PRA

CCAP

PRB

PRB

PRB

CCAP

CFA

CFA

CFA CFB

CFB

CFB

CFBTO

Introduction

• CAM-MAC

Time

transmitter

receiver

transmitter’sneighbor

receiver’sneighbor

PRA

PRA

PRA

CCAP

PRB

PRB

PRB

CCAP

CFA

CFA

CFA

CFBTO

NCF

NCF

NCF

INV

INV

Introduction

• CAM-MAC

Time

transmitter

receiver

transmitter’sneighbor

receiver’sneighbor

PRA

PRA

PRA

CCAP

PRB

PRB

PRB

CCAP

INV

INV Back off

Introduction

• CAM-MAC in broadcast scenario

11

1

1

2

1

A

B

C

D

Goal

• Propose a broadcast enhanced CAM-MAC called BMAC– The benefits of unicast in CAM-MAC are reserved– Efficient broadcast is introduced

System model

• A single half-duplex transceiver• A control channel and other data channel• Non-synchronization

BMAC

Time

transmitter

receiver

Two hopneighbor

Two hopneighbor

receiver

BPRA

BPRA

BPRA

BPT

Hidden terminal problem

Hidden terminal problem

Channel sw

itch

BMAC

Time

transmitter

receiver

Two hopneighbor

Two hopneighbor

receiver

BPRA

BPRA

BPRA

BPRA

BPRA

RI

RI

RI

BPT

BPRA

BPRA

BPRA

BPRA

BPRA

RI

RI

RI

Channel sw

itch

BMAC

• In BPT

Time

transmitter

receiver

Two hopneighbor

BPT

PRA

PRA

PRA

CCAP

BINV

BINV

Simulation

• Simulation setup

Parameter Value Topology 6*6 grid

Data packet size 1500 bytes

Data rate 54 Mbps

Simulation result

• Throughput

Simulation result

• Packet size

Simulation result

• Unicast and broadcast throughput

Conclusion

• The authors proposed a broadcast enhanced MAC protocol called BMAC in this paper– Ensure the compatibility of broadcast and unicast

traffic

• Simulation result shows that the new protocol increases the network performance in broadcast and unicast mixed environment

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Thanks for your at tention