Proposals of handoff procedures and queue management methods for improving communication efficiency in mobile Internet environments

摘要

This thesis mainly discusses the micro mobility problem in Mobile IP, QoS for mobile Internet environments and TCP in wireless environments. To overcome micro-mobility problem for Mobile IP, a seamless handoff method is proposed. The proposed method has simple mobility prediction control for the mobile node and the registration procedures are previously executed until the mobile node completely changes the connection point to theInternet. The seamless handoff method achieves complete elimination of the communicationdisruption with changing the connection point. The mobility prediction control is also extended to secure and high quality communications. These methods are also realized by the previous authentication or resource reservation for the next connectable base station. An adaptive handoff algorithm is also proposed for improving network resource utilization. The control is realized by improving typical “threshold-hysteresis algorithm.”Finally, a queue management method is proposed for improving TCP performance in wireless environments.