Research Article
Using Cross-layer Information to Improve TCP Performance with Vertical Handoffs
@INPROCEEDINGS{10.1109/ACCESSNETS.2007.4447135, author={Laila Daniel and Markku Kojo}, title={Using Cross-layer Information to Improve TCP Performance with Vertical Handoffs}, proceedings={1st International ICST Workshop on Broadband Wireless Access}, publisher={IEEE}, proceedings_a={BWIA}, year={2008}, month={2}, keywords={Access protocols Bandwidth Computer science Delay Internet Performance loss Propagation losses Proposals Transport protocols Wireless LAN}, doi={10.1109/ACCESSNETS.2007.4447135} }- Laila Daniel
Markku Kojo
Year: 2008
Using Cross-layer Information to Improve TCP Performance with Vertical Handoffs
BWIA
IEEE
DOI: 10.1109/ACCESSNETS.2007.4447135
Abstract
In this paper we study the performance of TCP with a vertical handoff between access networks with widely varying link characteristics. TCP being an end-to-end protocol has performance problems as its behaviour depends on the endto- end path characteristics which are likely to be affected by a vertical handoff. We propose a set of enhancements to the TCP sender algorithm that leverage on explicit cross-layer information regarding the change in the access link delay and bandwidth. We apply our enhanced algorithms and carry out a systematic study comparing the performance of the regular TCP to the performance of the enhanced TCP algorithms in various handoff scenarios between access networks having widely different bandwidth and delay characteristics. Our experiments show that with cross-layer notifications TCP performance can be improved significantly in most vertical handoff scenarios.