On the Network Mobility Management Scheme with Seamless Handover
Date Issued
2011
Date
2011
Author(s)
Lee, Cheng-Wei
Abstract
The evolution of wireless access technologies has led to a new era of mobile Internet for high speed vehicles. Network mobility is particularly suitable for vehicles because it considers the mobility of an entire network. Vehicles perform handover frequently thus efficient handover is essential to meet the QoS requirements for real-time communications. When moving with high speed, the time constraint is even stricter and the Doppler Effect increases the transmission error rate that both add challenges in mobility management.
In this dissertation, we first study the mobility management protocols for network mobility and the issues when applying to high-speed vehicles. A thorough review and feature comparison of network mobility solutions are presented. For the reasons of flexibility, route efficiency and security concern, we suggest that the nodes in the vehicle to be separated into different networks based on their characteristics, and managed by smart mobile routers (MRs).
To provide protocol-support for QoS-handover to high-speed vehicles, we propose a QoS incorporated network mobility architecture and protocols, called Hi-NEMO, for all-IP networks. Two complementary QoS-handover protocols are proposed, and Hi-NEMO does not introduce additional signaling between the BS and the MR. As a result, handover delay in an error-prone wireless environment can be reduced substantially.
Furthermore, in the era of green technology, high-speed rail systems are increasingly popular. Therefore, we investigate the mobility provisioning for long distance high-speed trains in WiMAX. In practice, resource reservation mechanisms have been designed to ensure the QoS during handover; however, there are rooms for improvement. We take advantage of the long physical size of high-speed trains and proposed the 2MR scheme that deploys two MRs, and then design handover protocols to provide seamless handover for the mobile nodes on the train.
Subjects
high-speed train
seamless handover
Type
thesis
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