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Uplink Congestion Control over Asymmetric Networks using Dynamic Segment Size Control  

Je, Jung-Kwang (경북대학교 정보통신학과)
Lee, Ji-Hyun (경북대학교 정보통신학과)
Lim, Kyung-Shik (경북대학교 컴퓨터과학과)
Publication Information
Journal of KIISE:Information Networking / v.34, no.6, 2007 , pp. 466-474 More about this Journal
Abstract
Asymmetric networks that the downlink bandwidth is larger than the uplink bandwidth may cause the degradation of the TCP performance due to the uplink congestion. In order to solve this problem, this paper designs and implements the Dynamic Segment Size Control mechanism which offers a suitable segment size for current networks. The proposed mechanism does not require any changes in customer premises but suppress the number of ACKs using segment reassembly technique to avoid the uplink congestion. The gateway which adapted the Dynamic Segment Size Control mechanism, detects the uplink congestion condition and dynamically measures the bandwidth asymmetric ratio and the packet loss ratio. The gateway reassembles some of segments received from the server into a large segment and transmits it to the client. This reduces the number of corresponding ACKs. In this mechanism, the SACK option is used when occurs the bit error during the transmission. Based on the simulation in the GEO satellite network environment, we analyzed the performance of the Dynamic Segment Size Control mechanism.
Keywords
Asymmetric networks; Packet reassembly; Uplink congestion; SACK; TCP;
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