successive interference cancellation in vehicular networks to relieve the negative impact of the...

SUCCESSIVE INTERFERENCE CANCELLATION IN VEHICULAR NETWORKS TO RELIEVE THE NEGATIVE IMPACT OF THE HIDDEN NODE PROBLEM

Carlos Pereira

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Outline

• Problem Statement• Idea• Evaluation metrics• Results• Conclusions

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Problem Statement

• Hidden Node

• Amount of packet collisions increases for:• Increasing Vehicle density• Increasing Transmitted Power• Increasing of Packet Size • Increasing of Beaconing rate

Increasing of load

Unsynchronized transmissions Packet Collisions

Idea: Recover packets from collisions using SIC

• Objective• Feasibility/Benefit Study

• Requirements• Characterization/Evaluation of packet collision

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Evaluation metrics

• Reception and Drop Probabilities • Probability of being involved in a collision• Number of packets overlapping• Energy distribution of colliding packets• Probability of Recovery through SIC

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Results

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• Packet drop probability• 60 Veh/km; 4 Lanes; TxPower = 20; Packet Size = 500 Bytes; Beacon Rate = 6Hz

Results

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• Packet drop probability• Reasons for Drop in StartRx (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size =

500 Bytes; Beacon Rate = 6Hz)

Results

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• Packet drop probability• Reasons for Drop in EndPreamble (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet

Size = 500 Bytes; Beacon Rate =6Hz)

Results

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• Packet drop probability• Reasons for Drop in EndHeader (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet

Size = 500 Bytes; Beacon Rate =6Hz)

Results

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• Packet drop probability• Reasons for Drop in EndRx (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size =

500 Bytes; Beacon Rate =6Hz)

Results

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• Packet drop probability• Variation of Beacon rate (60 Veh/km; 4 Lanes; TxPower = 20 dB; Packet Size = 300

Bytes)

Results

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• Packet drop probability• Variation of Beacon rate in StartRx (60 Veh/km; 4 Lanes; TxPower = 20 dB; Packet

Size = 300 Bytes)

Results

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• Packet drop probability• Variation of Beacon rate in EndPreamble (60 Veh/km; 4 Lanes; TxPower = 20 dB;

Packet Size = 300 Bytes)

Results

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• Packet drop probability• Variation of Beacon rate in EndRx (60 Veh/km; 4 Lanes; TxPower = 20 dB; Packet

Size = 300 Bytes)

Results

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• Packet drop probability• Variation of Packet Size (60 Veh/km; 4 Lanes; TxPower = 20 dB; Beacon Rate =

6Hz)

Results

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• Packet drop probability• Variation of Packet Size in StartRx (60 Veh/km; 4 Lanes; TxPower = 20 dB; Beacon

Rate = 6Hz)

Results

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• Packet drop probability• Variation of Packet Size in EndPreamble (60 Veh/km; 4 Lanes; TxPower = 20 dB;

Beacon Rate = 6Hz)

Results

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• Packet drop probability• Variation of Packet Size in EndRx (60 Veh/km; 4 Lanes; TxPower = 20 dB; Beacon

Rate = 6Hz)

Results

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• Packet drop probability• Variation of Vehicle Density (4 Lanes; TxPower = 20 dB; Packet Size = 500 Bytes;

Beacon Rate = 6Hz)

Results

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• Packet drop probability• Variation of Vehicle Density in StartRx (4 Lanes; TxPower = 20 dB; Packet Size =

500 Bytes; Beacon Rate = 6Hz)

Results

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• Packet drop probability• Variation of Vehicle Density in EndPreamble (4 Lanes; TxPower = 20 dB; Packet

Size = 500 Bytes; Beacon Rate = 6Hz)

Results

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• Packet drop probability• Variation of Vehicle Density in EndRx (4 Lanes; TxPower = 20 dB; Packet Size =

500 Bytes; Beacon Rate = 6Hz)

Results

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• Packet drop probability• Variation of TxPower (60 Veh/km; 4 Lanes; Packet Size = 500 Bytes; Beacon Rate

=6Hz)

Results

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• Packet drop probability• Variation of TxPower in StartRx (60 Veh/km; 4 Lanes; Packet Size = 500 Bytes;

Beacon Rate =6Hz)

Results

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• Packet drop probability• Variation of TxPower in EndPreamble (60 Veh/km; 4 Lanes; Packet Size = 500

Bytes; Beacon Rate =6Hz)

Results

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• Packet drop probability• Variation of TxPower in EndRx (60 Veh/km; 4 Lanes; Packet Size = 500 Bytes;

Beacon Rate =6Hz)

Results

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• Probability of being involved in a collision

Results

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• Probability of being involved in a collision

Results

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• Number of packets overlapping• Average

Results

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• Number of packets overlapping• Average

Results

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• Number of packets overlapping• Histogram (60 Veh/km; 4 Lanes; Packet Size = 500 Bytes; Beacon Rate = 2 Hz)

Results

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• Number of packets overlapping• Histogram (60 Veh/km; 4 Lanes; Packet Size = 500 Bytes; Beacon Rate = 6 Hz)

Results

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• Number of packets overlapping• Histogram (60 Veh/km; 4 Lanes; Packet Size = 500 Bytes; Beacon Rate = 10 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 1 Interferer (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 2 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 1 Interferer (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 6 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 1 Interferer (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 10 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 3 Interferers (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 2 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 3 Interferers (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 6 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 3 Interferers (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 10 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 5 Interferers (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 6 Hz)

Results

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• Energy distribution of colliding packets• Histogram for 5 Interferers (60 Veh/km; 4 Lanes; TxPower = 20dB; Packet Size = 500 Bytes;

Beacon Rate = 10 Hz)

Conclusions

Our feeling…

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Benefit

Load6 Mbps