Research On Some Key Technologies Of Mobility Management In Aeronautical Passenger Communication Environment

The goal of Aeronautical Passenger Communication (APC) services is is to provide indifference communication services to passenger on the plane. Not only the passengers can enjoy more comfortable and convenient travel, but also the airline company can increase the revenue and competitiveness if this service is opened. Since the civil planes fly rapidly and globally, how to keep the mobile devices carried by passenger communicating with the terrestrial network and how to ensure the communication satisfy certain requirements of service quality are two most important issues. Thus, the mobility management schemes which are suitable for the Aeronautical Passenger Communication environmentare in need of solving the above problems should be used.The existing Aeronautical Passenger Communication systems are based on the standard protocols such as MIPv6or NEMO. In the APC environment, these standard protocols may face some problems such as:(1) the handoff of standard protocols which are triggered by the reception of router advertisement or received signal strength (RSS) may not be triggered in time when the plane moves rapidly. In this case, large handoff delay may be caused;(2) the triangle routing in APC environment will cause large end-to-end delay due to the large geographic distance between planes and their home agents when the planes fly globally. Some improved versions of these standard protocols in other research fields are not taking the characteristic of APC environment into consideration, so they may face some limitations such as high handoff blocking probability, high new call blocking probability and large signaling overhead in air-to-ground link. Therefore, these improved protocols are not suitable for APC environment directly. Based on the analysis above, the main contribution of this dissertation can be summarized as follow:(1) A pre-registration fast handoff scheme named HPTFH (Handoff Probability Triggered Fast Handoff) in APC based on Air Traffic Management information is proposed.Firstly the Area Control Center in the Air Traffic Management system predicts the basic trajectory of the plane and the base stations which the plane may fly through according to the Air Traffic Management information. Then the handoff probability between plane and base stations will be calculated from the special mobility model of civil plane. Finally the pre-registration handoff will be triggered by the handoff probability instead of the traditional triggers. Simulation results show that HPTFH scheme can reduce the handoff delay obviously, compared with the traditional schemes triggered by router advertisement or RSS. In addition, the handoff delay is little influenced by the overlap area between base stations which is often limited in APC, and it is also not influenced by the delay between base station and home network of plane which is often large in APC environment, due to the global mobility of civil planes. So HPTFH is suitable for APC.(2) A predictive bandwidth reservation scheme for APC environment named APCR (Aeronautical Passenger Communication Reservation) and the relative call admission control and resource allocation method are proposed.The resource allocation model and its characteristics in APC environment are analyzed firstly. Then, the proposed scheme is not only considered the handoff time decided by the mobility pattern of the civil plane, but also take the traffic model of the whole plane into consideration. The mobility model of plane is used to predict the handoff time, and the bandwidth reserved for each plane in reference base station is predicted from the history record in the neighboring base stations. And then a predict threshold is set to calculate the total bandwidth reserved in the reference BS periodically. The simulation results show that APCR can reduce the handoff dropping probability than other schemes in the traditional cellular network, which not take the special characteristics of APC into consideration, as well as not increase the new call blocking probability.(3) A NEtwork Mobility (NEMO) route optimization scheme named ANRO (Aeronautical passenger communication NEMO Route Optimization) especially for APC environment is proposed.If the NEMO used in Aeronautical Passenger Communications environment, the basic protocol and the existing route optimization (RO) schemes of it may face some problems such as high end-to-end delay, high signaling overhead and high load of the home agent. Therefore, a NEMO route optimization scheme is proposed. This scheme establishes an Access Router (AR) to correspondent node (CN) RO scheme to optimize the path on the ground network, and updates the user’s location by the home agent of the mobile router. The analyses and comparisons show that the end-to-end delay of the proposed scheme is low and the signaling overhead of it in the air-to-ground wireless channel is the smallest among the schemes which can provide the similar end-to-end delay.