Network Supported Bandwidth Control for TCP in Hierarchical Mobile Internet


IEICE TRANSACTIONS on Communications   Vol.E88-B   No.1   pp.266-273
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.1.266
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Internet
handover,  TCP,  mobile Internet,  bandwidth control,  

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In the mobile Internet, a handover brings significant performance degradation of TCP due to bursty packet losses during handover processing. In this paper, we propose a new bandwidth control for improving the TCP performance. In the proposed system, when a mobile node changes its accessing base station, an intermediate router suppresses an available bandwidth to the corresponding TCP flow. Because suppressing the bandwidth results in reducing mis-forwarded packets to the old base station, the bursty packet losses can be avoided. In the hierarchical mobile network structure, which is recently developed in order to realize micro-mobility protocol, all packets transferred to mobile nodes are converged to several gateways such as mobility anchor points (MAP) in hierarchical Mobile IPv6 (HMIPv6). Therefore, the proposed system is suited to the hierarchical structure because it can be easily implemented at such gateways. Computer simulation results show that the proposed system can improve the TCP performance degradation especially in a situation where handovers frequently occur.