Co AP An advanced congestion control mechanism for

改善Co. AP傳輸之壅塞控制機制 An advanced congestion control mechanism for Co. AP communication 學生 : 李冠德 指導教授 : 吳和庭 博士 Date : 2017/06/29

Co. A主要構成 自適性RTO計算 Variable backoff factor(VBF) RTO老化機制(aging)

Co. A自適性RTO計算(cont. )

各壅塞控制比較 Strong RTTs Week RTTs RTO 老化機制 Backoff方式 ACK訊息回復 確認 Co. AP自定義壅塞控制 No No No BEB No Co. A Yes Yes VBF No Co. A-S Yes No Yes VBF No 本論文壅塞控制機制 Yes Yes VBF Yes

Tx/Rx Ratio 100% 模擬環境與初步結果 10 Client 20 Client 30 Client 40 Client RTT RTO Default. Co. AP - 2512 - 2423 - 2530 - 2611 Co. A 653 1097 764 1286 962 1621 1202 1945 Co. A-S 613 943 670 1122 822 1380 1054 1697

模擬環境與初步結果(cont. ) Tx/Rx成功率為 100%時各機制RTT與RTO比較 3000 2500 2000 1500 1000 500 0 RTT RTO 10 Client RTT RTO RTT 20 Client RTO 30 Client Default Co. Co. A-S RTT RTO 40 Client

Tx/Rx Ratio 98% 模擬環境與初步結果(cont. ) 10 Client RTT RTO 20 Client RTT RTO 30 Client RTT RTO 40 Client RTT RTO Default. Co. AP - 2315 - 2454 - 2365 - 2541 Co. A 940 1583 1203 2342 1756 3704 2669 4952 Co. A-S 870 1130 1096 2096 1512 3375 2646 4582

模擬環境與初步結果(cont. ) Tx/Rx成功率為 98%時各機制RTT與RTO比較 6000 5000 4000 3000 2000 1000 0 RTT RTO 10 Client RTT RTO RTT 20 Client RTO 30 Client Default Co. Co. A-S RTT RTO 40 Client

Tx/Rx Ratio 95% 模擬環境與初步結果(cont. ) 10 Client RTT RTO 2648 20 Client RTT RTO 2720 30 Client RTT RTO 2415 40 Client RTT RTO 2486 Co. A 1323 2216 1507 3547 1954 4230 2856 5497 Co. A-S 1185 1897 1364 3150 1875 4220 2794 5264 Default. Co. AP

模擬環境與初步結果(cont. ) Tx/Rx成功率為 95%時各機制RTT與RTO比較 6000 5000 4000 3000 2000 1000 0 RTT RTO 10 Client RTT RTO RTT 20 Client RTO 30 Client Default Co. Co. A-S RTT RTO 40 Client

References u. IETF RFC 7252 The Constrained Application Protocol (Co. AP) https: //tools. ietf. org/html/rfc 7252 u. IETF RFC 6298 Computing TCP's Retransmission Timer https: //tools. ietf. org/html/rfc 6298 u. August Betzler, Carles Gomez, Ilker Demirkol, and Josep Paradells, “Co. AP Congestion Control for the Internet of Things”, IEEE Communications Society, pp. 154 -160, 14 July 2016

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