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Research on the enhancement of throughput for traffic in WLAN  

Song, Byunjin (서울과학기술대학교 NID융합기술대학원 방송통신융합프로그램)
Lee, Seonhee (서울과학기술대학교 NID융합기술대학원 방송통신융합프로그램)
Publication Information
Journal of Satellite, Information and Communications / v.10, no.3, 2015 , pp. 53-56 More about this Journal
Abstract
In this paper, we want provide improved services with faster transmission, IEEE 802.11n was standardized. A-MPDU (Aggregation MAC Protocol Data UNIT) is a vital function of the IEEE 802.11n standard, which was proposed to improve transmission rate by reducing frame transmission overhead. In this paper, we show the problems of TCP retransmission with A-MPDU and propose a solution utilizing the property of TCP cumulative ACK. If the transmission of an MPDU subframe fails, A-MPDU mechanism allows selective re-transmission of failed MPDU subframe in the MAC layer. In TCP traffic transmission, however, a failed MPDU transmission causes TCP Duplicate ACK, which causes unnecessary TCP re-transmission. Furthermore, congestion control of TCP causes reduction in throughput. By supressing unnecessary duplicate ACKs the proposed mechanism reduces the overhead in transmitting redundant TCP ACKs, and transmitting only a HS-ACK with the highest sequence number. By using the RACK mechanism, through the simulation results, it was conrmed that the RACK mechanism increases up to 20% compared the conventional A-MPDU, at the same time, it tightly assures the fairness among TCP flows.
Keywords
TCP Traffic; A-MPDU; A-MSDU; Wireless; Throughput;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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