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)

ConclusionsOur feeling…

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Benefit

Load6 Mbps