1st International ICST Conference on Multimedia Services Access Networks

Research Article

USHA: a practical vertical handoff solution

  • @INPROCEEDINGS{10.1109/MSAN.2005.1489948,
        author={Ling-Jyh  Chen and Tony Sun and Mario  Gerla},
        title={USHA: a practical vertical handoff solution},
        proceedings={1st International ICST Conference on Multimedia Services Access Networks},
  • Ling-Jyh Chen
    Tony Sun
    Mario Gerla
    Year: 2005
    USHA: a practical vertical handoff solution
    DOI: 10.1109/MSAN.2005.1489948
Ling-Jyh Chen1,*, Tony Sun1,*, Mario Gerla1,*
  • 1: Computer Science Department, UCLA
*Contact email: cclljj@CS.UCLA.EDU, tonysun@CS.UCLA.EDU, gerla@CS.UCLA.EDU


We present a seamless handoff solution, called Universal Seamless Handoff Architecture (USHA). USHA is simple and requires minimal modification to the current Internet infrastructure. Therefore, it is instantly ready for real-world deployment. Using testbed experiments, we evaluate USHA by observing TCP (FTP downloading) behavior in various vertical handoff scenarios. The results shows that USHA can successfully maintain the application connectivity in all cases. Furthermore, the results also shows that when handoff from a low capacity link to a high capacity link, there is no service latency caused by the handoff; whereas when the handoff is from high capacity link to a lower capacity link, the on-negligible latency could not be alleviated unless early handoff notification can be provided.