TCP Performance Enhancement over Wireless Mobile Networks ...

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MTech Project Report ... Department of Computer Science and Engineering ... der the inter-operability of the mobile host with different networks , and also could  ...
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Case 1: State : Send window open at disconnection event. Action: Start sending new packets at reconnection and set new rtx timer. FH

MH

Disconnection Reconnection

RTO new

Initail Window = 8 packets.

q/“”—€’~>%8 ~„  

Case 2: State: Send window closed and waiting for acks at disconnection event. Action: retransmiiting the last unacked packet with ssthresh set to window reached till disconnection at reconnection. FH

MH Disconnection

Connection RTO new

RTO old Initial Window = 8 packets.

q/“”—€’~>%8 ~„ ( 

Case 3: State: send window was closed and waiting for acks at disconnection event. Action: lost packet retransmitted without invoking congestion control mechanism as a disconnection event has occurred during wait period of the ack. FH

MH Disconnection

Connection RTO new

RTO old Initail Window = 8 packets.

q/“”—€’~>%8 ~„ o 









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Sent but unacknowledged Acknowledged Usable Window

Sender Window FH’s sending window space before ZWA received.

Negative Usable Window Acknowledged

FH’s sending window space after ZWA received.

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c capacity d msec delay

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c capacity d msec delay

BS For Simulating WLAN

MH c = 2 Mbps d = 15 msec

For Simulating WWAN c = 100 Kbps d = 150 msec

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120000 TCP-Reno AwareTCP 110000

Throughput(KB)

100000

90000

80000

70000

60000

50000 0

500

1000

1500 2000 2500 Disconnection Period(ms)

3000

3500

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14000 TCP-Reno ATCP 12000

Throughput(KB)

10000

8000

6000

4000

2000

0 0

500

1000

1500

2000 Handoff(ms)

2500

3000

3500

4000

qs“˜—€’~>%8 1 „ o 5vu CB?lqwu –jŽwC%Ž6 >}ŽH‘X™Bq8G> "E/66  ,-,H™ 

130000 TCP-Reno 3DA ATCP Freeze TCP (4 ms)

120000

Throughput(KB)

110000

100000

90000

80000

70000

60000

50000 0

500

1000

1500 2000 2500 Disconnection Period(ms)

3000

3500

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4000

11000 TCP-Reno 3DA ATCP Freeze TCP (600ms) Freeze TCP (60ms)

10000 9000 8000

Throughput(KB)

7000 6000 5000 4000 3000 2000 1000 0 0

500

1000

1500 2000 2500 Disconnection Period(ms)

3000

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Window

Retransmitted packets arrival

Time Long disconnection TCP in long disconnection condition.

Window

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Time Frequent Disconnections TCP in frequent disconnections condition.

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3500

4000

11000 d = 100ms d = 200ms d = 300ms d = 500ms

10000

9000

Throughput(KB)

8000

7000

6000

5000

4000

3000

2000 0

500

1000

1500

2000 Handoff(ms)

2500

3000

3500

4000

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